diff options
| -rw-r--r-- | drivers/scsi/Makefile | 2 | ||||
| -rw-r--r-- | drivers/scsi/iscsi_tcp.c | 2811 | ||||
| -rw-r--r-- | drivers/scsi/iscsi_tcp.h | 179 | ||||
| -rw-r--r-- | drivers/scsi/libiscsi.c | 1697 | ||||
| -rw-r--r-- | drivers/scsi/scsi_devinfo.c | 2 | ||||
| -rw-r--r-- | drivers/scsi/scsi_scan.c | 57 | ||||
| -rw-r--r-- | drivers/scsi/scsi_transport_iscsi.c | 624 | ||||
| -rw-r--r-- | include/scsi/iscsi_if.h | 106 | ||||
| -rw-r--r-- | include/scsi/libiscsi.h | 286 | ||||
| -rw-r--r-- | include/scsi/scsi_devinfo.h | 1 | ||||
| -rw-r--r-- | include/scsi/scsi_transport_iscsi.h | 107 |
11 files changed, 3520 insertions, 2352 deletions
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile index 81803a16f98..3ce80ab4824 100644 --- a/drivers/scsi/Makefile +++ b/drivers/scsi/Makefile @@ -33,7 +33,7 @@ obj-$(CONFIG_SCSI_FC_ATTRS) += scsi_transport_fc.o obj-$(CONFIG_SCSI_ISCSI_ATTRS) += scsi_transport_iscsi.o obj-$(CONFIG_SCSI_SAS_ATTRS) += scsi_transport_sas.o -obj-$(CONFIG_ISCSI_TCP) += iscsi_tcp.o +obj-$(CONFIG_ISCSI_TCP) += libiscsi.o iscsi_tcp.o obj-$(CONFIG_SCSI_AMIGA7XX) += amiga7xx.o 53c7xx.o obj-$(CONFIG_A3000_SCSI) += a3000.o wd33c93.o obj-$(CONFIG_A2091_SCSI) += a2091.o wd33c93.o diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index 2068b66822b..fe00a3f6d20 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -3,7 +3,8 @@ * * Copyright (C) 2004 Dmitry Yusupov * Copyright (C) 2004 Alex Aizman - * Copyright (C) 2005 Mike Christie + * Copyright (C) 2005 - 2006 Mike Christie + * Copyright (C) 2006 Red Hat, Inc. All rights reserved. * maintained by open-iscsi@googlegroups.com * * This program is free software; you can redistribute it and/or modify @@ -36,10 +37,6 @@ #include <linux/mutex.h> #include <net/tcp.h> #include <scsi/scsi_cmnd.h> -#include <scsi/scsi_device.h> -#include <scsi/scsi_eh.h> -#include <scsi/scsi_request.h> -#include <scsi/scsi_tcq.h> #include <scsi/scsi_host.h> #include <scsi/scsi.h> #include <scsi/scsi_transport_iscsi.h> @@ -52,21 +49,14 @@ MODULE_DESCRIPTION("iSCSI/TCP data-path"); MODULE_LICENSE("GPL"); MODULE_VERSION("0:4.445"); /* #define DEBUG_TCP */ -/* #define DEBUG_SCSI */ #define DEBUG_ASSERT #ifdef DEBUG_TCP -#define debug_tcp(fmt...) printk(KERN_DEBUG "tcp: " fmt) +#define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) #else #define debug_tcp(fmt...) #endif -#ifdef DEBUG_SCSI -#define debug_scsi(fmt...) printk(KERN_DEBUG "scsi: " fmt) -#else -#define debug_scsi(fmt...) -#endif - #ifndef DEBUG_ASSERT #ifdef BUG_ON #undef BUG_ON @@ -74,8 +64,6 @@ MODULE_VERSION("0:4.445"); #define BUG_ON(expr) #endif -#define INVALID_SN_DELTA 0xffff - static unsigned int iscsi_max_lun = 512; module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); @@ -130,68 +118,39 @@ static inline void iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, u8* crc) { - crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc); - buf->sg.length += sizeof(uint32_t); -} + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; -static void -iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) -{ - struct iscsi_session *session = conn->session; - unsigned long flags; - - spin_lock_irqsave(&session->lock, flags); - if (session->conn_cnt == 1 || session->leadconn == conn) - session->state = ISCSI_STATE_FAILED; - spin_unlock_irqrestore(&session->lock, flags); - set_bit(SUSPEND_BIT, &conn->suspend_tx); - set_bit(SUSPEND_BIT, &conn->suspend_rx); - iscsi_conn_error(conn->cls_conn, err); + crypto_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc); + buf->sg.length += sizeof(uint32_t); } static inline int -iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) +iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn) { - uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); - uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); - - if (max_cmdsn < exp_cmdsn -1 && - max_cmdsn > exp_cmdsn - INVALID_SN_DELTA) - return ISCSI_ERR_MAX_CMDSN; - if (max_cmdsn > session->max_cmdsn || - max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA) - session->max_cmdsn = max_cmdsn; - if (exp_cmdsn > session->exp_cmdsn || - exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA) - session->exp_cmdsn = exp_cmdsn; + struct sk_buff *skb = tcp_conn->in.skb; - return 0; -} - -static inline int -iscsi_hdr_extract(struct iscsi_conn *conn) -{ - struct sk_buff *skb = conn->in.skb; + tcp_conn->in.zero_copy_hdr = 0; - if (conn->in.copy >= conn->hdr_size && - conn->in_progress == IN_PROGRESS_WAIT_HEADER) { + if (tcp_conn->in.copy >= tcp_conn->hdr_size && + tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) { /* * Zero-copy PDU Header: using connection context * to store header pointer. */ if (skb_shinfo(skb)->frag_list == NULL && - !skb_shinfo(skb)->nr_frags) - conn->in.hdr = (struct iscsi_hdr *) - ((char*)skb->data + conn->in.offset); - else { + !skb_shinfo(skb)->nr_frags) { + tcp_conn->in.hdr = (struct iscsi_hdr *) + ((char*)skb->data + tcp_conn->in.offset); + tcp_conn->in.zero_copy_hdr = 1; + } else { /* ignoring return code since we checked * in.copy before */ - skb_copy_bits(skb, conn->in.offset, - &conn->hdr, conn->hdr_size); - conn->in.hdr = &conn->hdr; + skb_copy_bits(skb, tcp_conn->in.offset, + &tcp_conn->hdr, tcp_conn->hdr_size); + tcp_conn->in.hdr = &tcp_conn->hdr; } - conn->in.offset += conn->hdr_size; - conn->in.copy -= conn->hdr_size; + tcp_conn->in.offset += tcp_conn->hdr_size; + tcp_conn->in.copy -= tcp_conn->hdr_size; } else { int hdr_remains; int copylen; @@ -201,118 +160,61 @@ iscsi_hdr_extract(struct iscsi_conn *conn) * copying it... This'll happen quite rarely. */ - if (conn->in_progress == IN_PROGRESS_WAIT_HEADER) - conn->in.hdr_offset = 0; + if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) + tcp_conn->in.hdr_offset = 0; - hdr_remains = conn->hdr_size - conn->in.hdr_offset; + hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset; BUG_ON(hdr_remains <= 0); - copylen = min(conn->in.copy, hdr_remains); - skb_copy_bits(skb, conn->in.offset, - (char*)&conn->hdr + conn->in.hdr_offset, copylen); + copylen = min(tcp_conn->in.copy, hdr_remains); + skb_copy_bits(skb, tcp_conn->in.offset, + (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset, + copylen); debug_tcp("PDU gather offset %d bytes %d in.offset %d " - "in.copy %d\n", conn->in.hdr_offset, copylen, - conn->in.offset, conn->in.copy); + "in.copy %d\n", tcp_conn->in.hdr_offset, copylen, + tcp_conn->in.offset, tcp_conn->in.copy); - conn->in.offset += copylen; - conn->in.copy -= copylen; + tcp_conn->in.offset += copylen; + tcp_conn->in.copy -= copylen; if (copylen < hdr_remains) { - conn->in_progress = IN_PROGRESS_HEADER_GATHER; - conn->in.hdr_offset += copylen; + tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER; + tcp_conn->in.hdr_offset += copylen; return -EAGAIN; } - conn->in.hdr = &conn->hdr; - conn->discontiguous_hdr_cnt++; - conn->in_progress = IN_PROGRESS_WAIT_HEADER; + tcp_conn->in.hdr = &tcp_conn->hdr; + tcp_conn->discontiguous_hdr_cnt++; + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; } return 0; } -static inline void -iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +/* + * must be called with session lock + */ +static void +__iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { - struct scsi_cmnd *sc = ctask->sc; - struct iscsi_session *session = conn->session; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct scsi_cmnd *sc; - spin_lock(&session->lock); - if (unlikely(!sc)) { - spin_unlock(&session->lock); + sc = ctask->sc; + if (unlikely(!sc)) return; - } + if (sc->sc_data_direction == DMA_TO_DEVICE) { struct iscsi_data_task *dtask, *n; + /* WRITE: cleanup Data-Out's if any */ - list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) { + list_for_each_entry_safe(dtask, n, &tcp_ctask->dataqueue, + item) { list_del(&dtask->item); - mempool_free(dtask, ctask->datapool); + mempool_free(dtask, tcp_ctask->datapool); } } - ctask->xmstate = XMSTATE_IDLE; - ctask->r2t = NULL; - ctask->sc = NULL; - __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); - spin_unlock(&session->lock); -} - -/** - * iscsi_cmd_rsp - SCSI Command Response processing - * @conn: iscsi connection - * @ctask: scsi command task - **/ -static int -iscsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - int rc; - struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)conn->in.hdr; - struct iscsi_session *session = conn->session; - struct scsi_cmnd *sc = ctask->sc; - - rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); - if (rc) { - sc->result = (DID_ERROR << 16); - goto out; - } - - conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; - - sc->result = (DID_OK << 16) | rhdr->cmd_status; - - if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { - sc->result = (DID_ERROR << 16); - goto out; - } - - if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION && conn->senselen) { - int sensecopy = min(conn->senselen, SCSI_SENSE_BUFFERSIZE); - - memcpy(sc->sense_buffer, conn->data + 2, sensecopy); - debug_scsi("copied %d bytes of sense\n", sensecopy); - } - - if (sc->sc_data_direction == DMA_TO_DEVICE) - goto out; - - if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { - int res_count = be32_to_cpu(rhdr->residual_count); - - if (res_count > 0 && res_count <= sc->request_bufflen) - sc->resid = res_count; - else - sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; - } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) - sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; - else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) - sc->resid = be32_to_cpu(rhdr->residual_count); - -out: - debug_scsi("done [sc %lx res %d itt 0x%x]\n", - (long)sc, sc->result, ctask->itt); - conn->scsirsp_pdus_cnt++; - iscsi_ctask_cleanup(conn, ctask); - sc->scsi_done(sc); - return rc; + tcp_ctask->xmstate = XMSTATE_IDLE; + tcp_ctask->r2t = NULL; } /** @@ -324,7 +226,9 @@ static int iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { int rc; - struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)conn->in.hdr; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; struct iscsi_session *session = conn->session; int datasn = be32_to_cpu(rhdr->datasn); @@ -334,9 +238,9 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) /* * setup Data-In byte counter (gets decremented..) */ - ctask->data_count = conn->in.datalen; + ctask->data_count = tcp_conn->in.datalen; - if (conn->in.datalen == 0) + if (tcp_conn->in.datalen == 0) return 0; if (ctask->datasn != datasn) @@ -344,8 +248,8 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) ctask->datasn++; - ctask->data_offset = be32_to_cpu(rhdr->offset); - if (ctask->data_offset + conn->in.datalen > ctask->total_length) + tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); + if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length) return ISCSI_ERR_DATA_OFFSET; if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { @@ -392,17 +296,19 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, struct iscsi_data *hdr; struct iscsi_data_task *dtask; struct scsi_cmnd *sc = ctask->sc; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; - dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); + dtask = mempool_alloc(tcp_ctask->datapool, GFP_ATOMIC); BUG_ON(!dtask); + INIT_LIST_HEAD(&dtask->item); hdr = &dtask->hdr; memset(hdr, 0, sizeof(struct iscsi_data)); hdr->ttt = r2t->ttt; hdr->datasn = cpu_to_be32(r2t->solicit_datasn); r2t->solicit_datasn++; hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->itt = ctask->hdr.itt; + memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); + hdr->itt = ctask->hdr->itt; hdr->exp_statsn = r2t->exp_statsn; hdr->offset = cpu_to_be32(r2t->data_offset); if (r2t->data_length > conn->max_xmit_dlength) { @@ -451,11 +357,11 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, } BUG_ON(r2t->sg == NULL); } else - iscsi_buf_init_iov(&ctask->sendbuf, + iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)sc->request_buffer + r2t->data_offset, r2t->data_count); - list_add(&dtask->item, &ctask->dataqueue); + list_add(&dtask->item, &tcp_ctask->dataqueue); } /** @@ -468,17 +374,16 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { struct iscsi_r2t_info *r2t; struct iscsi_session *session = conn->session; - struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)conn->in.hdr; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; int r2tsn = be32_to_cpu(rhdr->r2tsn); int rc; - if (conn->in.ahslen) - return ISCSI_ERR_AHSLEN; - - if (conn->in.datalen) + if (tcp_conn->in.datalen) return ISCSI_ERR_DATALEN; - if (ctask->exp_r2tsn && ctask->exp_r2tsn != r2tsn) + if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn) return ISCSI_ERR_R2TSN; rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); @@ -496,7 +401,7 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) spin_unlock(&session->lock); return 0; } - rc = __kfifo_get(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); + rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); BUG_ON(!rc); r2t->exp_statsn = rhdr->statsn; @@ -518,10 +423,10 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) iscsi_solicit_data_init(conn, ctask, r2t); - ctask->exp_r2tsn = r2tsn + 1; - ctask->xmstate |= XMSTATE_SOL_HDR; - __kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*)); - __kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*)); + tcp_ctask->exp_r2tsn = r2tsn + 1; + tcp_ctask->xmstate |= XMSTATE_SOL_HDR; + __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); + __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*)); scsi_queue_work(session->host, &conn->xmitwork); conn->r2t_pdus_cnt++; @@ -531,258 +436,136 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) } static int -iscsi_hdr_recv(struct iscsi_conn *conn) +iscsi_tcp_hdr_recv(struct iscsi_conn *conn) { - int rc = 0; + int rc = 0, opcode, ahslen; struct iscsi_hdr *hdr; - struct iscsi_cmd_task *ctask; struct iscsi_session *session = conn->session; - uint32_t cdgst, rdgst = 0; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + uint32_t cdgst, rdgst = 0, itt; - hdr = conn->in.hdr; + hdr = tcp_conn->in.hdr; /* verify PDU length */ - conn->in.datalen = ntoh24(hdr->dlength); - if (conn->in.datalen > conn->max_recv_dlength) { + tcp_conn->in.datalen = ntoh24(hdr->dlength); + if (tcp_conn->in.datalen > conn->max_recv_dlength) { printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", - conn->in.datalen, conn->max_recv_dlength); + tcp_conn->in.datalen, conn->max_recv_dlength); return ISCSI_ERR_DATALEN; } - conn->data_copied = 0; + tcp_conn->data_copied = 0; /* read AHS */ - conn->in.ahslen = hdr->hlength * 4; - conn->in.offset += conn->in.ahslen; - conn->in.copy -= conn->in.ahslen; - if (conn->in.copy < 0) { + ahslen = hdr->hlength << 2; + tcp_conn->in.offset += ahslen; + tcp_conn->in.copy -= ahslen; + if (tcp_conn->in.copy < 0) { printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " - "%d bytes\n", conn->in.ahslen); + "%d bytes\n", ahslen); return ISCSI_ERR_AHSLEN; } /* calculate read padding */ - conn->in.padding = conn->in.datalen & (ISCSI_PAD_LEN-1); - if (conn->in.padding) { - conn->in.padding = ISCSI_PAD_LEN - conn->in.padding; - debug_scsi("read padding %d bytes\n", conn->in.padding); + tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1); + if (tcp_conn->in.padding) { + tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding; + debug_scsi("read padding %d bytes\n", tcp_conn->in.padding); } if (conn->hdrdgst_en) { struct scatterlist sg; sg_init_one(&sg, (u8 *)hdr, - sizeof(struct iscsi_hdr) + conn->in.ahslen); - crypto_digest_digest(conn->rx_tfm, &sg, 1, (u8 *)&cdgst); + sizeof(struct iscsi_hdr) + ahslen); + crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst); rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + - conn->in.ahslen); + ahslen); if (cdgst != rdgst) { - printk(KERN_ERR "iscsi_tcp: itt %x: hdrdgst error " - "recv 0x%x calc 0x%x\n", conn->in.itt, rdgst, - cdgst); + printk(KERN_ERR "iscsi_tcp: hdrdgst error " + "recv 0x%x calc 0x%x\n", rdgst, cdgst); return ISCSI_ERR_HDR_DGST; } } - /* save opcode for later */ - conn->in.opcode = hdr->opcode & ISCSI_OPCODE_MASK; - + opcode = hdr->opcode & ISCSI_OPCODE_MASK; /* verify itt (itt encoding: age+cid+itt) */ - if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { - if ((hdr->itt & AGE_MASK) != - (session->age << AGE_SHIFT)) { - printk(KERN_ERR "iscsi_tcp: received itt %x expected " - "session age (%x)\n", hdr->itt, - session->age & AGE_MASK); - return ISCSI_ERR_BAD_ITT; - } - - if ((hdr->itt & CID_MASK) != (conn->id << CID_SHIFT)) { - printk(KERN_ERR "iscsi_tcp: received itt %x, expected " - "CID (%x)\n", hdr->itt, conn->id); - return ISCSI_ERR_BAD_ITT; - } - conn->in.itt = hdr->itt & ITT_MASK; - } else - conn->in.itt = hdr->itt; + rc = iscsi_verify_itt(conn, hdr, &itt); + if (rc == ISCSI_ERR_NO_SCSI_CMD) { + tcp_conn->in.datalen = 0; /* force drop */ + return 0; + } else if (rc) + return rc; debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", - hdr->opcode, conn->in.offset, conn->in.copy, - conn->in.ahslen, conn->in.datalen); - - if (conn->in.itt < session->cmds_max) { - ctask = (struct iscsi_cmd_task *)session->cmds[conn->in.itt]; - - if (!ctask->sc) { - printk(KERN_INFO "iscsi_tcp: dropping ctask with " - "itt 0x%x\n", ctask->itt); - conn->in.datalen = 0; /* force drop */ - return 0; - } - - if (ctask->sc->SCp.phase != session->age) { - printk(KERN_ERR "iscsi_tcp: ctask's session age %d, " - "expected %d\n", ctask->sc->SCp.phase, - session->age); - return ISCSI_ERR_SESSION_FAILED; - } - - conn->in.ctask = ctask; - - debug_scsi("rsp [op 0x%x cid %d sc %lx itt 0x%x len %d]\n", - hdr->opcode, conn->id, (long)ctask->sc, - ctask->itt, conn->in.datalen); - - switch(conn->in.opcode) { - case ISCSI_OP_SCSI_CMD_RSP: - BUG_ON((void*)ctask != ctask->sc->SCp.ptr); - if (!conn->in.datalen) - rc = iscsi_cmd_rsp(conn, ctask); - else - /* - * got sense or response data; copying PDU - * Header to the connection's header - * placeholder - */ - memcpy(&conn->hdr, hdr, - sizeof(struct iscsi_hdr)); - break; - case ISCSI_OP_SCSI_DATA_IN: - BUG_ON((void*)ctask != ctask->sc->SCp.ptr); - /* save flags for non-exceptional status */ - conn->in.flags = hdr->flags; - /* save cmd_status for sense data */ - conn->in.cmd_status = - ((struct iscsi_data_rsp*)hdr)->cmd_status; - rc = iscsi_data_rsp(conn, ctask); - break; - case ISCSI_OP_R2T: - BUG_ON((void*)ctask != ctask->sc->SCp.ptr); - if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) - rc = iscsi_r2t_rsp(conn, ctask); - else - rc = ISCSI_ERR_PROTO; - break; - default: - rc = ISCSI_ERR_BAD_OPCODE; - break; - } - } else if (conn->in.itt >= ISCSI_MGMT_ITT_OFFSET && - conn->in.itt < ISCSI_MGMT_ITT_OFFSET + - session->mgmtpool_max) { - struct iscsi_mgmt_task *mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[conn->in.itt - - ISCSI_MGMT_ITT_OFFSET]; - - debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", - conn->in.opcode, conn->id, mtask->itt, - conn->in.datalen); - - switch(conn->in.opcode) { - case ISCSI_OP_LOGIN_RSP: - case ISCSI_OP_TEXT_RSP: - case ISCSI_OP_LOGOUT_RSP: - rc = iscsi_check_assign_cmdsn(session, - (struct iscsi_nopin*)hdr); - if (rc) - break; - - if (!conn->in.datalen) { - rc = iscsi_recv_pdu(conn->cls_conn, hdr, - NULL, 0); - if (conn->login_mtask != mtask) { - spin_lock(&session->lock); - __kfifo_put(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*)); - spin_unlock(&session->lock); - } - } - break; - case ISCSI_OP_SCSI_TMFUNC_RSP: - rc = iscsi_check_assign_cmdsn(session, - (struct iscsi_nopin*)hdr); - if (rc) - break; + opcode, tcp_conn->in.offset, tcp_conn->in.copy, + ahslen, tcp_conn->in.datalen); - if (conn->in.datalen || conn->in.ahslen) { - rc = ISCSI_ERR_PROTO; - break; - } - conn->tmfrsp_pdus_cnt++; - spin_lock(&session->lock); - if (conn->tmabort_state == TMABORT_INITIAL) { - __kfifo_put(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*)); - conn->tmabort_state = - ((struct iscsi_tm_rsp *)hdr)-> - response == ISCSI_TMF_RSP_COMPLETE ? - TMABORT_SUCCESS:TMABORT_FAILED; - /* unblock eh_abort() */ - wake_up(&conn->ehwait); - } - spin_unlock(&session->lock); - break; - case ISCSI_OP_NOOP_IN: - if (hdr->ttt != ISCSI_RESERVED_TAG) { - rc = ISCSI_ERR_PROTO; - break; - } - rc = iscsi_check_assign_cmdsn(session, - (struct iscsi_nopin*)hdr); - if (rc) - break; - conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; - - if (!conn->in.datalen) { - struct iscsi_mgmt_task *mtask; - - rc = iscsi_recv_pdu(conn->cls_conn, hdr, - NULL, 0); - mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[conn->in.itt - - ISCSI_MGMT_ITT_OFFSET]; - if (conn->login_mtask != mtask) { - spin_lock(&session->lock); - __kfifo_put(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*)); - spin_unlock(&session->lock); - } - } - break; - default: - rc = ISCSI_ERR_BAD_OPCODE; - break; - } - } else if (conn->in.itt == ISCSI_RESERVED_TAG) { - switch(conn->in.opcode) { - case ISCSI_OP_NOOP_IN: - if (!conn->in.datalen) { - rc = iscsi_check_assign_cmdsn(session, - (struct iscsi_nopin*)hdr); - if (!rc && hdr->ttt != ISCSI_RESERVED_TAG) - rc = iscsi_recv_pdu(conn->cls_conn, - hdr, NULL, 0); - } else - rc = ISCSI_ERR_PROTO; - break; - case ISCSI_OP_REJECT: - /* we need sth like iscsi_reject_rsp()*/ - case ISCSI_OP_ASYNC_EVENT: - /* we need sth like iscsi_async_event_rsp() */ - rc = ISCSI_ERR_BAD_OPCODE; - break; - default: - rc = ISCSI_ERR_BAD_OPCODE; - break; - } - } else - rc = ISCSI_ERR_BAD_ITT; + switch(opcode) { + case ISCSI_OP_SCSI_DATA_IN: + tcp_conn->in.ctask = session->cmds[itt]; + rc = iscsi_data_rsp(conn, tcp_conn->in.ctask); + /* fall through */ + case ISCSI_OP_SCSI_CMD_RSP: + tcp_conn->in.ctask = session->cmds[itt]; + if (tcp_conn->in.datalen) + goto copy_hdr; + + spin_lock(&session->lock); + __iscsi_ctask_cleanup(conn, tcp_conn->in.ctask); + rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); + spin_unlock(&session->lock); + break; + case ISCSI_OP_R2T: + tcp_conn->in.ctask = session->cmds[itt]; + if (ahslen) + rc = ISCSI_ERR_AHSLEN; + else if (tcp_conn->in.ctask->sc->sc_data_direction == + DMA_TO_DEVICE) + rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); + else + rc = ISCSI_ERR_PROTO; + break; + case ISCSI_OP_LOGIN_RSP: + case ISCSI_OP_TEXT_RSP: + case ISCSI_OP_LOGOUT_RSP: + case ISCSI_OP_NOOP_IN: + case ISCSI_OP_REJECT: + case ISCSI_OP_ASYNC_EVENT: + if (tcp_conn->in.datalen) + goto copy_hdr; + /* fall through */ + case ISCSI_OP_SCSI_TMFUNC_RSP: + rc = iscsi_complete_pdu(conn, hdr, NULL, 0); + break; + default: + rc = ISCSI_ERR_BAD_OPCODE; + break; + } return rc; + +copy_hdr: + /* + * if we did zero copy for the header but we will need multiple + * skbs to complete the command then we have to copy the header + * for later use + */ + if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy < + (tcp_conn->in.datalen + tcp_conn->in.padding + + (conn->datadgst_en ? 4 : 0))) { + debug_tcp("Copying header for later use. in.copy %d in.datalen" + " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); + memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, + sizeof(struct iscsi_hdr)); + tcp_conn->in.hdr = &tcp_conn->hdr; + tcp_conn->in.zero_copy_hdr = 0; + } + return 0; } /** * iscsi_ctask_copy - copy skb bits to the destanation cmd task - * @conn: iscsi connection + * @conn: iscsi tcp connection * @ctask: scsi command task * @buf: buffer to copy to * @buf_size: size of buffer @@ -804,110 +587,113 @@ iscsi_hdr_recv(struct iscsi_conn *conn) * buf_left left to copy from in progress buffer **/ static inline int -iscsi_ctask_copy(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, +iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, void *buf, int buf_size, int offset) { - int buf_left = buf_size - (conn->data_copied + offset); - int size = min(conn->in.copy, buf_left); + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + int buf_left = buf_size - (tcp_conn->data_copied + offset); + int size = min(tcp_conn->in.copy, buf_left); int rc; size = min(size, ctask->data_count); debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", - size, conn->in.offset, conn->in.copied); + size, tcp_conn->in.offset, tcp_conn->in.copied); BUG_ON(size <= 0); - BUG_ON(ctask->sent + size > ctask->total_length); + BUG_ON(tcp_ctask->sent + size > ctask->total_length); - rc = skb_copy_bits(conn->in.skb, conn->in.offset, - (char*)buf + (offset + conn->data_copied), size); + rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, + (char*)buf + (offset + tcp_conn->data_copied), size); /* must fit into skb->len */ BUG_ON(rc); - conn->in.offset += size; - conn->in.copy -= size; - conn->in.copied += size; - conn->data_copied += size; - ctask->sent += size; + tcp_conn->in.offset += size; + tcp_conn->in.copy -= size; + tcp_conn->in.copied += size; + tcp_conn->data_copied += size; + tcp_ctask->sent += size; ctask->data_count -= size; - BUG_ON(conn->in.copy < 0); + BUG_ON(tcp_conn->in.copy < 0); BUG_ON(ctask->data_count < 0); - if (buf_size != (conn->data_copied + offset)) { + if (buf_size != (tcp_conn->data_copied + offset)) { if (!ctask->data_count) { - BUG_ON(buf_size - conn->data_copied < 0); + BUG_ON(buf_size - tcp_conn->data_copied < 0); /* done with this PDU */ - return buf_size - conn->data_copied; + return buf_size - tcp_conn->data_copied; } return -EAGAIN; } /* done with this buffer or with both - PDU and buffer */ - conn->data_copied = 0; + tcp_conn->data_copied = 0; return 0; } /** * iscsi_tcp_copy - copy skb bits to the destanation buffer - * @conn: iscsi connection - * @buf: buffer to copy to - * @buf_size: number of bytes to copy + * @conn: iscsi tcp connection * * Notes: * The function calls skb_copy_bits() and updates per-connection * byte counters. **/ static inline int -iscsi_tcp_copy(struct iscsi_conn *conn, void *buf, int buf_size) +iscsi_tcp_copy(struct iscsi_tcp_conn *tcp_conn) { - int buf_left = buf_size - conn->data_copied; - int size = min(conn->in.copy, buf_left); + void *buf = tcp_conn->data; + int buf_size = tcp_conn->in.datalen; + int buf_left = buf_size - tcp_conn->data_copied; + int size = min(tcp_conn->in.copy, buf_left); int rc; debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", - size, conn->in.offset, conn->data_copied); + size, tcp_conn->in.offset, tcp_conn->data_copied); BUG_ON(size <= 0); - rc = skb_copy_bits(conn->in.skb, conn->in.offset, - (char*)buf + conn->data_copied, size); + rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, + (char*)buf + tcp_conn->data_copied, size); BUG_ON(rc); - conn->in.offset += size; - conn->in.copy -= size; - conn->in.copied += size; - conn->data_copied += size; + tcp_conn->in.offset += size; + tcp_conn->in.copy -= size; + tcp_conn->in.copied += size; + tcp_conn->data_copied += size; - if (buf_size != conn->data_copied) + if (buf_size != tcp_conn->data_copied) return -EAGAIN; return 0; } static inline void -partial_sg_digest_update(struct iscsi_conn *conn, struct scatterlist *sg, - int offset, int length) +partial_sg_digest_update(struct iscsi_tcp_conn *tcp_conn, + struct scatterlist *sg, int offset, int length) { struct scatterlist temp; memcpy(&temp, sg, sizeof(struct scatterlist)); temp.offset = offset; temp.length = length; - crypto_digest_update(conn->data_rx_tfm, &temp, 1); + crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1); } static void -iscsi_recv_digest_update(struct iscsi_conn *conn, char* buf, int len) +iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) { struct scatterlist tmp; sg_init_one(&tmp, buf, len); - crypto_digest_update(conn->data_rx_tfm, &tmp, 1); + crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1); } static int iscsi_scsi_data_in(struct iscsi_conn *conn) { - struct iscsi_cmd_task *ctask = conn->in.ctask; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct scsi_cmnd *sc = ctask->sc; struct scatterlist *sg; int i, offset, rc = 0; @@ -919,31 +705,33 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn) */ if (!sc->use_sg) { i = ctask->data_count; - rc = iscsi_ctask_copy(conn, ctask, sc->request_buffer, - sc->request_bufflen, ctask->data_offset); + rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, + sc->request_bufflen, + tcp_ctask->data_offset); if (rc == -EAGAIN) return rc; if (conn->datadgst_en) - iscsi_recv_digest_update(conn, sc->request_buffer, i); + iscsi_recv_digest_update(tcp_conn, sc->request_buffer, + i); rc = 0; goto done; } - offset = ctask->data_offset; + offset = tcp_ctask->data_offset; sg = sc->request_buffer; - if (ctask->data_offset) - for (i = 0; i < ctask->sg_count; i++) + if (tcp_ctask->data_offset) + for (i = 0; i < tcp_ctask->sg_count; i++) offset -= sg[i].length; /* we've passed through partial sg*/ if (offset < 0) offset = 0; - for (i = ctask->sg_count; i < sc->use_sg; i++) { + for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { char *dest; dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); - rc = iscsi_ctask_copy(conn, ctask, dest + sg[i].offset, + rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, sg[i].length, offset); kunmap_atomic(dest, KM_SOFTIRQ0); if (rc == -EAGAIN) @@ -952,15 +740,17 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn) if (!rc) { if (conn->datadgst_en) { if (!offset) - crypto_digest_update(conn->data_rx_tfm, - &sg[i], 1); + crypto_digest_update( + tcp_conn->data_rx_tfm, + &sg[i], 1); else - partial_sg_digest_update(conn, &sg[i], + partial_sg_digest_update(tcp_conn, + &sg[i], sg[i].offset + offset, sg[i].length - offset); } offset = 0; - ctask->sg_count++; + tcp_ctask->sg_count++; } if (!ctask->data_count) { @@ -968,25 +758,26 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn) /* * data-in is complete, but buffer not... */ - partial_sg_digest_update(conn, &sg[i], + partial_sg_digest_update(tcp_conn, &sg[i], sg[i].offset, sg[i].length-rc); rc = 0; break; } - if (!conn->in.copy) + if (!tcp_conn->in.copy) return -EAGAIN; } BUG_ON(ctask->data_count); done: /* check for non-exceptional status */ - if (conn->in.flags & ISCSI_FLAG_DATA_STATUS) { + if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { debug_scsi("done [sc %lx res %d itt 0x%x]\n", (long)sc, sc->result, ctask->itt); - conn->scsirsp_pdus_cnt++; - iscsi_ctask_cleanup(conn, ctask); - sc->scsi_done(sc); + spin_lock(&conn->session->lock); + __iscsi_ctask_cleanup(conn, ctask); + __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); + spin_unlock(&conn->session->lock); } return rc; @@ -995,71 +786,38 @@ done: static int iscsi_data_recv(struct iscsi_conn *conn) { - struct iscsi_session *session = conn->session; - int rc = 0; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + int rc = 0, opcode; - switch(conn->in.opcode) { + opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; + switch (opcode) { case ISCSI_OP_SCSI_DATA_IN: rc = iscsi_scsi_data_in(conn); break; - case ISCSI_OP_SCSI_CMD_RSP: { - /* - * SCSI Sense Data: - * copying the entire Data Segment. - */ - if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) { - rc = -EAGAIN; - goto exit; - } - - /* - * check for sense - */ - conn->in.hdr = &conn->hdr; - conn->senselen = (conn->data[0] << 8) | conn->data[1]; - rc = iscsi_cmd_rsp(conn, conn->in.ctask); - if (!rc && conn->datadgst_en) - iscsi_recv_digest_update(conn, conn->data, - conn->in.datalen); - } - break; + case ISCSI_OP_SCSI_CMD_RSP: + spin_lock(&conn->session->lock); + __iscsi_ctask_cleanup(conn, tcp_conn->in.ctask); + spin_unlock(&conn->session->lock); case ISCSI_OP_TEXT_RSP: case ISCSI_OP_LOGIN_RSP: - case ISCSI_OP_NOOP_IN: { - struct iscsi_mgmt_task *mtask = NULL; - - if (conn->in.itt != ISCSI_RESERVED_TAG) - mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[conn->in.itt - - ISCSI_MGMT_ITT_OFFSET]; - + case ISCSI_OP_NOOP_IN: + case ISCSI_OP_ASYNC_EVENT: + case ISCSI_OP_REJECT: /* * Collect data segment to the connection's data * placeholder */ - if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) { + if (iscsi_tcp_copy(tcp_conn)) { rc = -EAGAIN; goto exit; } - rc = iscsi_recv_pdu(conn->cls_conn, conn->in.hdr, - conn->data, conn->in.datalen); - - if (!rc && conn->datadgst_en && - conn->in.opcode != ISCSI_OP_LOGIN_RSP) - iscsi_recv_digest_update(conn, conn->data, - conn->in.datalen); - - if (mtask && conn->login_mtask != mtask) { - spin_lock(&session->lock); - __kfifo_put(session->mgmtpool.queue, (void*)&mtask, - sizeof(void*)); - spin_unlock(&session->lock); - } - } - break; - case ISCSI_OP_ASYNC_EVENT: - case ISCSI_OP_REJECT: + rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, tcp_conn->data, + tcp_conn->in.datalen); + if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) + iscsi_recv_digest_update(tcp_conn, tcp_conn->data, + tcp_conn->in.datalen); + break; default: BUG_ON(1); } @@ -1080,6 +838,7 @@ iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, { int rc; struct iscsi_conn *conn = rd_desc->arg.data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; int processed; char pad[ISCSI_PAD_LEN]; struct scatterlist sg; @@ -1088,15 +847,15 @@ iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, * Save current SKB and its offset in the corresponding * connection context. */ - conn->in.copy = skb->len - offset; - conn->in.offset = offset; - conn->in.skb = skb; - conn->in.len = conn->in.copy; - BUG_ON(conn->in.copy <= 0); - debug_tcp("in %d bytes\n", conn->in.copy); + tcp_conn->in.copy = skb->len - offset; + tcp_conn->in.offset = offset; + tcp_conn->in.skb = skb; + tcp_conn->in.len = tcp_conn->in.copy; + BUG_ON(tcp_conn->in.copy <= 0); + debug_tcp("in %d bytes\n", tcp_conn->in.copy); more: - conn->in.copied = 0; + tcp_conn->in.copied = 0; rc = 0; if (unlikely(conn->suspend_rx)) { @@ -1104,9 +863,9 @@ more: return 0; } - if (conn->in_progress == IN_PROGRESS_WAIT_HEADER || - conn->in_progress == IN_PROGRESS_HEADER_GATHER) { - rc = iscsi_hdr_extract(conn); + if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || + tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { + rc = iscsi_hdr_extract(tcp_conn); if (rc) { if (rc == -EAGAIN) goto nomore; @@ -1119,90 +878,94 @@ more: /* * Verify and process incoming PDU header. */ - rc = iscsi_hdr_recv(conn); - if (!rc && conn->in.datalen) { + rc = iscsi_tcp_hdr_recv(conn); + if (!rc && tcp_conn->in.datalen) { if (conn->datadgst_en) { - BUG_ON(!conn->data_rx_tfm); - crypto_digest_init(conn->data_rx_tfm); + BUG_ON(!tcp_conn->data_rx_tfm); + crypto_digest_init(tcp_conn->data_rx_tfm); } - conn->in_progress = IN_PROGRESS_DATA_RECV; + tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; } else if (rc) { iscsi_conn_failure(conn, rc); return 0; } } - if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { + if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { uint32_t recv_digest; + debug_tcp("extra data_recv offset %d copy %d\n", - conn->in.offset, conn->in.copy); - skb_copy_bits(conn->in.skb, conn->in.offset, + tcp_conn->in.offset, tcp_conn->in.copy); + skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, &recv_digest, 4); - conn->in.offset += 4; - conn->in.copy -= 4; - if (recv_digest != conn->in.datadgst) { + tcp_conn->in.offset += 4; + tcp_conn->in.copy -= 4; + if (recv_digest != tcp_conn->in.datadgst) { debug_tcp("iscsi_tcp: data digest error!" "0x%x != 0x%x\n", recv_digest, - conn->in.datadgst); + tcp_conn->in.datadgst); iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); return 0; } else { debug_tcp("iscsi_tcp: data digest match!" "0x%x == 0x%x\n", recv_digest, - conn->in.datadgst); - conn->in_progress = IN_PROGRESS_WAIT_HEADER; + tcp_conn->in.datadgst); + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; } } - if (conn->in_progress == IN_PROGRESS_DATA_RECV && conn->in.copy) { + if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && + tcp_conn->in.copy) { debug_tcp("data_recv offset %d copy %d\n", - conn->in.offset, conn->in.copy); + tcp_conn->in.offset, tcp_conn->in.copy); rc = iscsi_data_recv(conn); if (rc) { if (rc == -EAGAIN) { - rd_desc->count = conn->in.datalen - - conn->in.ctask->data_count; + rd_desc->count = tcp_conn->in.datalen - + tcp_conn->in.ctask->data_count; goto again; } iscsi_conn_failure(conn, rc); return 0; } - conn->in.copy -= conn->in.padding; - conn->in.offset += conn->in.padding; + tcp_conn->in.copy -= tcp_conn->in.padding; + tcp_conn->in.offset += tcp_conn->in.padding; if (conn->datadgst_en) { - if (conn->in.padding) { - debug_tcp("padding -> %d\n", conn->in.padding); - memset(pad, 0, conn->in.padding); - sg_init_one(&sg, pad, conn->in.padding); - crypto_digest_update(conn->data_rx_tfm, &sg, 1); + if (tcp_conn->in.padding) { + debug_tcp("padding -> %d\n", + tcp_conn->in.padding); + memset(pad, 0, tcp_conn->in.padding); + sg_init_one(&sg, pad, tcp_conn->in.padding); + crypto_digest_update(tcp_conn->data_rx_tfm, + &sg, 1); } - crypto_digest_final(conn->data_rx_tfm, - (u8 *) & conn->in.datadgst); - debug_tcp("rx digest 0x%x\n", conn->in.datadgst); - conn->in_progress = IN_PROGRESS_DDIGEST_RECV; + crypto_digest_final(tcp_conn->data_rx_tfm, + (u8 *) & tcp_conn->in.datadgst); + debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); + tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; } else - conn->in_progress = IN_PROGRESS_WAIT_HEADER; + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; } debug_tcp("f, processed %d from out of %d padding %d\n", - conn->in.offset - offset, (int)len, conn->in.padding); - BUG_ON(conn->in.offset - offset > len); + tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); + BUG_ON(tcp_conn->in.offset - offset > len); - if (conn->in.offset - offset != len) { + if (tcp_conn->in.offset - offset != len) { debug_tcp("continue to process %d bytes\n", - (int)len - (conn->in.offset - offset)); + (int)len - (tcp_conn->in.offset - offset)); goto more; } nomore: - processed = conn->in.offset - offset; + processed = tcp_conn->in.offset - offset; BUG_ON(processed == 0); return processed; again: - processed = conn->in.offset - offset; + processed = tcp_conn->in.offset - offset; debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", processed, (int)len, (int)rd_desc->count); BUG_ON(processed == 0); @@ -1231,6 +994,7 @@ iscsi_tcp_data_ready(struct sock *sk, int flag) static void iscsi_tcp_state_change(struct sock *sk) { + struct iscsi_tcp_conn *tcp_conn; struct iscsi_conn *conn; struct iscsi_session *session; void (*old_state_change)(struct sock *); @@ -1247,7 +1011,8 @@ iscsi_tcp_state_change(struct sock *sk) iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); } - old_state_change = conn->old_state_change; + tcp_conn = conn->dd_data; + old_state_change = tcp_conn->old_state_change; read_unlock(&sk->sk_callback_lock); @@ -1262,23 +1027,26 @@ static void iscsi_write_space(struct sock *sk) { struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; - conn->old_write_space(sk); + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + + tcp_conn->old_write_space(sk); debug_tcp("iscsi_write_space: cid %d\n", conn->id); - clear_bit(SUSPEND_BIT, &conn->suspend_tx); + clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); scsi_queue_work(conn->session->host, &conn->xmitwork); } static void iscsi_conn_set_callbacks(struct iscsi_conn *conn) { - struct sock *sk = conn->sock->sk; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct sock *sk = tcp_conn->sock->sk; /* assign new callbacks */ write_lock_bh(&sk->sk_callback_lock); sk->sk_user_data = conn; - conn->old_data_ready = sk->sk_data_ready; - conn->old_state_change = sk->sk_state_change; - conn->old_write_space = sk->sk_write_space; + tcp_conn->old_data_ready = sk->sk_data_ready; + tcp_conn->old_state_change = sk->sk_state_change; + tcp_conn->old_write_space = sk->sk_write_space; sk->sk_data_ready = iscsi_tcp_data_ready; sk->sk_state_change = iscsi_tcp_state_change; sk->sk_write_space = iscsi_write_space; @@ -1288,14 +1056,15 @@ iscsi_conn_set_callbacks(struct iscsi_conn *conn) static void iscsi_conn_restore_callbacks(struct iscsi_conn *conn) { - struct sock *sk = conn->sock->sk; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct sock *sk = tcp_conn->sock->sk; /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ write_lock_bh(&sk->sk_callback_lock); sk->sk_user_data = NULL; - sk->sk_data_ready = conn->old_data_ready; - sk->sk_state_change = conn->old_state_change; - sk->sk_write_space = conn->old_write_space; + sk->sk_data_ready = tcp_conn->old_data_ready; + sk->sk_state_change = tcp_conn->old_state_change; + sk->sk_write_space = tcp_conn->old_write_space; sk->sk_no_check = 0; write_unlock_bh(&sk->sk_callback_lock); } @@ -1310,7 +1079,8 @@ iscsi_conn_restore_callbacks(struct iscsi_conn *conn) static inline int iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) { - struct socket *sk = conn->sock; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct socket *sk = tcp_conn->sock; int offset = buf->sg.offset + buf->sent; /* @@ -1324,7 +1094,8 @@ iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) if (buf->use_sendmsg) return sock_no_sendpage(sk, buf->sg.page, offset, size, flags); else - return conn->sendpage(sk, buf->sg.page, offset, size, flags); + return tcp_conn->sendpage(sk, buf->sg.page, offset, size, + flags); } /** @@ -1339,6 +1110,7 @@ iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) static inline int iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) { + struct iscsi_tcp_conn *tcp_conn; int flags = 0; /* MSG_DONTWAIT; */ int res, size; @@ -1356,8 +1128,9 @@ iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) return -EAGAIN; return 0; } else if (res == -EAGAIN) { - conn->sendpage_failures_cnt++; - set_bit(SUSPEND_BIT, &conn->suspend_tx); + tcp_conn = conn->dd_data; + tcp_conn->sendpage_failures_cnt++; + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); } else if (res == -EPIPE) iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); @@ -1378,6 +1151,7 @@ static inline int iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, int *count, int *sent) { + struct iscsi_tcp_conn *tcp_conn; int flags = 0; /* MSG_DONTWAIT; */ int res, size; @@ -1400,8 +1174,9 @@ iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, return -EAGAIN; return 0; } else if (res == -EAGAIN) { - conn->sendpage_failures_cnt++; - set_bit(SUSPEND_BIT, &conn->suspend_tx); + tcp_conn = conn->dd_data; + tcp_conn->sendpage_failures_cnt++; + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); } else if (res == -EPIPE) iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); @@ -1409,30 +1184,35 @@ iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, } static inline void -iscsi_data_digest_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, + struct iscsi_cmd_task *ctask) { - BUG_ON(!conn->data_tx_tfm); - crypto_digest_init(conn->data_tx_tfm); - ctask->digest_count = 4; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + BUG_ON(!tcp_conn->data_tx_tfm); + crypto_digest_init(tcp_conn->data_tx_tfm); + tcp_ctask->digest_count = 4; } static int iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, struct iscsi_buf *buf, uint32_t *digest, int final) { + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; int rc = 0; int sent = 0; if (final) - crypto_digest_final(conn->data_tx_tfm, (u8*)digest); + crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest); iscsi_buf_init_virt(buf, (char*)digest, 4); - rc = iscsi_sendpage(conn, buf, &ctask->digest_count, &sent); + rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); if (rc) { - ctask->datadigest = *digest; - ctask->xmstate |= XMSTATE_DATA_DIGEST; + tcp_ctask->datadigest = *digest; + tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; } else - ctask->digest_count = 4; + tcp_ctask->digest_count = 4; return rc; } @@ -1453,21 +1233,23 @@ static void iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, struct iscsi_r2t_info *r2t, int left) { + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_data *hdr; struct iscsi_data_task *dtask; struct scsi_cmnd *sc = ctask->sc; int new_offset; - dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); + dtask = mempool_alloc(tcp_ctask->datapool, GFP_ATOMIC); BUG_ON(!dtask); + INIT_LIST_HEAD(&dtask->item); hdr = &dtask->hdr; memset(hdr, 0, sizeof(struct iscsi_data)); hdr->ttt = r2t->ttt; hdr->datasn = cpu_to_be32(r2t->solicit_datasn); r2t->solicit_datasn++; hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->itt = ctask->hdr.itt; + memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); + hdr->itt = ctask->hdr->itt; hdr->exp_statsn = r2t->exp_statsn; new_offset = r2t->data_offset + r2t->sent; hdr->offset = cpu_to_be32(new_offset); @@ -1487,175 +1269,102 @@ iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, r2t->dtask = dtask; if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { - BUG_ON(ctask->bad_sg == r2t->sg); + BUG_ON(tcp_ctask->bad_sg == r2t->sg); iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); r2t->sg += 1; } else - iscsi_buf_init_iov(&ctask->sendbuf, + iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)sc->request_buffer + new_offset, r2t->data_count); - list_add(&dtask->item, &ctask->dataqueue); + list_add(&dtask->item, &tcp_ctask->dataqueue); } static void iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { - struct iscsi_data *hdr; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_data_task *dtask; - dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); + dtask = mempool_alloc(tcp_ctask->datapool, GFP_ATOMIC); BUG_ON(!dtask); - hdr = &dtask->hdr; - memset(hdr, 0, sizeof(struct iscsi_data)); - hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); - hdr->datasn = cpu_to_be32(ctask->unsol_datasn); - ctask->unsol_datasn++; - hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->itt = ctask->hdr.itt; - hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); - hdr->offset = cpu_to_be32(ctask->total_length - - ctask->r2t_data_count - - ctask->unsol_count); - if (ctask->unsol_count > conn->max_xmit_dlength) { - hton24(hdr->dlength, conn->max_xmit_dlength); - ctask->data_count = conn->max_xmit_dlength; - hdr->flags = 0; - } else { - hton24(hdr->dlength, ctask->unsol_count); - ctask->data_count = ctask->unsol_count; - hdr->flags = ISCSI_FLAG_CMD_FINAL; - } + INIT_LIST_HEAD(&dtask->item); - iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr, + iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr, + tcp_ctask->r2t_data_count); + iscsi_buf_init_virt(&tcp_ctask->headbuf, (char*)&dtask->hdr, sizeof(struct iscsi_hdr)); - list_add(&dtask->item, &ctask->dataqueue); - - ctask->dtask = dtask; + list_add(&dtask->item, &tcp_ctask->dataqueue); + tcp_ctask->dtask = dtask; } /** - * iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands + * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands * @conn: iscsi connection * @ctask: scsi command task * @sc: scsi command **/ static void -iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, - struct scsi_cmnd *sc) +iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) { - struct iscsi_session *session = conn->session; - - BUG_ON(__kfifo_len(ctask->r2tqueue)); - - ctask->sc = sc; - ctask->conn = conn; - ctask->hdr.opcode = ISCSI_OP_SCSI_CMD; - ctask->hdr.flags = ISCSI_ATTR_SIMPLE; - int_to_scsilun(sc->device->lun, (struct scsi_lun *)ctask->hdr.lun); - ctask->hdr.itt = ctask->itt | (conn->id << CID_SHIFT) | - (session->age << AGE_SHIFT); - ctask->hdr.data_length = cpu_to_be32(sc->request_bufflen); - ctask->hdr.cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++; - ctask->hdr.exp_statsn = cpu_to_be32(conn->exp_statsn); - memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len); - memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len); + struct scsi_cmnd *sc = ctask->sc; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; - ctask->mtask = NULL; - ctask->sent = 0; - ctask->sg_count = 0; + BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); - ctask->total_length = sc->request_bufflen; + tcp_ctask->sent = 0; + tcp_ctask->sg_count = 0; if (sc->sc_data_direction == DMA_TO_DEVICE) { - ctask->exp_r2tsn = 0; - ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE; + tcp_ctask->xmstate = XMSTATE_W_HDR; + tcp_ctask->exp_r2tsn = 0; BUG_ON(ctask->total_length == 0); + if (sc->use_sg) { struct scatterlist *sg = sc->request_buffer; - iscsi_buf_init_sg(&ctask->sendbuf, - &sg[ctask->sg_count++]); - ctask->sg = sg; - ctask->bad_sg = sg + sc->use_sg; - } else { - iscsi_buf_init_iov(&ctask->sendbuf, sc->request_buffer, - sc->request_bufflen); - } + iscsi_buf_init_sg(&tcp_ctask->sendbuf, + &sg[tcp_ctask->sg_count++]); + tcp_ctask->sg = sg; + tcp_ctask->bad_sg = sg + sc->use_sg; + } else + iscsi_buf_init_iov(&tcp_ctask->sendbuf, + sc->request_buffer, + sc->request_bufflen); - /* - * Write counters: - * - * imm_count bytes to be sent right after - * SCSI PDU Header - * - * unsol_count bytes(as Data-Out) to be sent - * without R2T ack right after - * immediate data - * - * r2t_data_count bytes to be sent via R2T ack's - * - * pad_count bytes to be sent as zero-padding - */ - ctask->imm_count = 0; - ctask->unsol_count = 0; - ctask->unsol_datasn = 0; - ctask->xmstate = XMSTATE_W_HDR; - /* calculate write padding */ - ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); - if (ctask->pad_count) { - ctask->pad_count = ISCSI_PAD_LEN - ctask->pad_count; + if (ctask->imm_count) + tcp_ctask->xmstate |= XMSTATE_IMM_DATA; + + tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); + if (tcp_ctask->pad_count) { + tcp_ctask->pad_count = ISCSI_PAD_LEN - + tcp_ctask->pad_count; debug_scsi("write padding %d bytes\n", - ctask->pad_count); - ctask->xmstate |= XMSTATE_W_PAD; + tcp_ctask->pad_count); + tcp_ctask->xmstate |= XMSTATE_W_PAD; } - if (session->imm_data_en) { - if (ctask->total_length >= session->first_burst) - ctask->imm_count = min(session->first_burst, - conn->max_xmit_dlength); - else - ctask->imm_count = min(ctask->total_length, - conn->max_xmit_dlength); - hton24(ctask->hdr.dlength, ctask->imm_count); - ctask->xmstate |= XMSTATE_IMM_DATA; - } else - zero_data(ctask->hdr.dlength); - - if (!session->initial_r2t_en) - ctask->unsol_count = min(session->first_burst, - ctask->total_length) - ctask->imm_count; - if (!ctask->unsol_count) - /* No unsolicit Data-Out's */ - ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL; - else - ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT; - ctask->r2t_data_count = ctask->total_length - + if (ctask->unsol_count) + tcp_ctask->xmstate |= XMSTATE_UNS_HDR | + XMSTATE_UNS_INIT; + tcp_ctask->r2t_data_count = ctask->total_length - ctask->imm_count - ctask->unsol_count; debug_scsi("cmd [itt %x total %d imm %d imm_data %d " "r2t_data %d]\n", ctask->itt, ctask->total_length, ctask->imm_count, - ctask->unsol_count, ctask->r2t_data_count); - } else { - ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL; - if (sc->sc_data_direction == DMA_FROM_DEVICE) - ctask->hdr.flags |= ISCSI_FLAG_CMD_READ; - ctask->datasn = 0; - ctask->xmstate = XMSTATE_R_HDR; - zero_data(ctask->hdr.dlength); - } + ctask->unsol_count, tcp_ctask->r2t_data_count); + } else + tcp_ctask->xmstate = XMSTATE_R_HDR; - iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr, + iscsi_buf_init_virt(&tcp_ctask->headbuf, (char*)ctask->hdr, sizeof(struct iscsi_hdr)); - conn->scsicmd_pdus_cnt++; } /** - * iscsi_mtask_xmit - xmit management(immediate) task + * iscsi_tcp_mtask_xmit - xmit management(immediate) task * @conn: iscsi connection * @mtask: task management task * @@ -1669,70 +1378,87 @@ iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress **/ static int -iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) +iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) { + struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", - conn->id, mtask->xmstate, mtask->itt); + conn->id, tcp_mtask->xmstate, mtask->itt); - if (mtask->xmstate & XMSTATE_IMM_HDR) { - mtask->xmstate &= ~XMSTATE_IMM_HDR; + if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { + tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; if (mtask->data_count) - mtask->xmstate |= XMSTATE_IMM_DATA; + tcp_mtask->xmstate |= XMSTATE_IMM_DATA; if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && - conn->stop_stage != STOP_CONN_RECOVER && + conn->stop_stage != STOP_CONN_RECOVER && conn->hdrdgst_en) - iscsi_hdr_digest(conn, &mtask->headbuf, - (u8*)mtask->hdrext); - if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) { - mtask->xmstate |= XMSTATE_IMM_HDR; + iscsi_hdr_digest(conn, &tcp_mtask->headbuf, + (u8*)tcp_mtask->hdrext); + if (iscsi_sendhdr(conn, &tcp_mtask->headbuf, + mtask->data_count)) { + tcp_mtask->xmstate |= XMSTATE_IMM_HDR; if (mtask->data_count) - mtask->xmstate &= ~XMSTATE_IMM_DATA; + tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; return -EAGAIN; } } - if (mtask->xmstate & XMSTATE_IMM_DATA) { + if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { BUG_ON(!mtask->data_count); - mtask->xmstate &= ~XMSTATE_IMM_DATA; + tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; /* FIXME: implement. * Virtual buffer could be spreaded across multiple pages... */ do { - if (iscsi_sendpage(conn, &mtask->sendbuf, - &mtask->data_count, &mtask->sent)) { - mtask->xmstate |= XMSTATE_IMM_DATA; + if (iscsi_sendpage(conn, &tcp_mtask->sendbuf, + &mtask->data_count, &tcp_mtask->sent)) { + tcp_mtask->xmstate |= XMSTATE_IMM_DATA; return -EAGAIN; } } while (mtask->data_count); } - BUG_ON(mtask->xmstate != XMSTATE_IDLE); + BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); + if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { + struct iscsi_session *session = conn->session; + + spin_lock_bh(&session->lock); + list_del(&conn->mtask->running); + __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, + sizeof(void*)); + spin_unlock_bh(&session->lock); + } return 0; } static inline int -handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +handle_xmstate_r_hdr(struct iscsi_conn *conn, + struct iscsi_tcp_cmd_task *tcp_ctask) { - ctask->xmstate &= ~XMSTATE_R_HDR; + tcp_ctask->xmstate &= ~XMSTATE_R_HDR; if (conn->hdrdgst_en) - iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext); - if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) { - BUG_ON(ctask->xmstate != XMSTATE_IDLE); + iscsi_hdr_digest(conn, &tcp_ctask->headbuf, + (u8*)tcp_ctask->hdrext); + if (!iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0)) { + BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE); return 0; /* wait for Data-In */ } - ctask->xmstate |= XMSTATE_R_HDR; + tcp_ctask->xmstate |= XMSTATE_R_HDR; return -EAGAIN; } static inline int -handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +handle_xmstate_w_hdr(struct iscsi_conn *conn, + struct iscsi_cmd_task *ctask) { - ctask->xmstate &= ~XMSTATE_W_HDR; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + tcp_ctask->xmstate &= ~XMSTATE_W_HDR; if (conn->hdrdgst_en) - iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext); - if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) { - ctask->xmstate |= XMSTATE_W_HDR; + iscsi_hdr_digest(conn, &tcp_ctask->headbuf, + (u8*)tcp_ctask->hdrext); + if (iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count)) { + tcp_ctask->xmstate |= XMSTATE_W_HDR; return -EAGAIN; } return 0; @@ -1742,13 +1468,15 @@ static inline int handle_xmstate_data_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { - ctask->xmstate &= ~XMSTATE_DATA_DIGEST; - debug_tcp("resent data digest 0x%x\n", ctask->datadigest); - if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf, - &ctask->datadigest, 0)) { - ctask->xmstate |= XMSTATE_DATA_DIGEST; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST; + debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest); + if (iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, + &tcp_ctask->datadigest, 0)) { + tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; debug_tcp("resent data digest 0x%x fail!\n", - ctask->datadigest); + tcp_ctask->datadigest); return -EAGAIN; } return 0; @@ -1757,44 +1485,47 @@ handle_xmstate_data_digest(struct iscsi_conn *conn, static inline int handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + BUG_ON(!ctask->imm_count); - ctask->xmstate &= ~XMSTATE_IMM_DATA; + tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; if (conn->datadgst_en) { - iscsi_data_digest_init(conn, ctask); - ctask->immdigest = 0; + iscsi_data_digest_init(tcp_conn, ctask); + tcp_ctask->immdigest = 0; } for (;;) { - if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->imm_count, - &ctask->sent)) { - ctask->xmstate |= XMSTATE_IMM_DATA; + if (iscsi_sendpage(conn, &tcp_ctask->sendbuf, &ctask->imm_count, + &tcp_ctask->sent)) { + tcp_ctask->xmstate |= XMSTATE_IMM_DATA; if (conn->datadgst_en) { - crypto_digest_final(conn->data_tx_tfm, - (u8*)&ctask->immdigest); + crypto_digest_final(tcp_conn->data_tx_tfm, + (u8*)&tcp_ctask->immdigest); debug_tcp("tx imm sendpage fail 0x%x\n", - ctask->datadigest); + tcp_ctask->datadigest); } return -EAGAIN; } if (conn->datadgst_en) - crypto_digest_update(conn->data_tx_tfm, - &ctask->sendbuf.sg, 1); + crypto_digest_update(tcp_conn->data_tx_tfm, + &tcp_ctask->sendbuf.sg, 1); if (!ctask->imm_count) break; - iscsi_buf_init_sg(&ctask->sendbuf, - &ctask->sg[ctask->sg_count++]); + iscsi_buf_init_sg(&tcp_ctask->sendbuf, + &tcp_ctask->sg[tcp_ctask->sg_count++]); } - if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) { - if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf, - &ctask->immdigest, 1)) { + if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { + if (iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, + &tcp_ctask->immdigest, 1)) { debug_tcp("sending imm digest 0x%x fail!\n", - ctask->immdigest); + tcp_ctask->immdigest); return -EAGAIN; } - debug_tcp("sending imm digest 0x%x\n", ctask->immdigest); + debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest); } return 0; @@ -1803,52 +1534,55 @@ handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) static inline int handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_data_task *dtask; - ctask->xmstate |= XMSTATE_UNS_DATA; - if (ctask->xmstate & XMSTATE_UNS_INIT) { + tcp_ctask->xmstate |= XMSTATE_UNS_DATA; + if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { iscsi_unsolicit_data_init(conn, ctask); - BUG_ON(!ctask->dtask); - dtask = ctask->dtask; + BUG_ON(!tcp_ctask->dtask); + dtask = tcp_ctask->dtask; if (conn->hdrdgst_en) - iscsi_hdr_digest(conn, &ctask->headbuf, + iscsi_hdr_digest(conn, &tcp_ctask->headbuf, (u8*)dtask->hdrext); - ctask->xmstate &= ~XMSTATE_UNS_INIT; + tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; } - if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) { - ctask->xmstate &= ~XMSTATE_UNS_DATA; - ctask->xmstate |= XMSTATE_UNS_HDR; + if (iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count)) { + tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; + tcp_ctask->xmstate |= XMSTATE_UNS_HDR; return -EAGAIN; } debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", - ctask->itt, ctask->unsol_count, ctask->sent); + ctask->itt, ctask->unsol_count, tcp_ctask->sent); return 0; } static inline int handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { - struct iscsi_data_task *dtask = ctask->dtask; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_data_task *dtask = tcp_ctask->dtask; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; BUG_ON(!ctask->data_count); - ctask->xmstate &= ~XMSTATE_UNS_DATA; + tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; if (conn->datadgst_en) { - iscsi_data_digest_init(conn, ctask); + iscsi_data_digest_init(tcp_conn, ctask); dtask->digest = 0; } for (;;) { - int start = ctask->sent; + int start = tcp_ctask->sent; - if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->data_count, - &ctask->sent)) { - ctask->unsol_count -= ctask->sent - start; - ctask->xmstate |= XMSTATE_UNS_DATA; + if (iscsi_sendpage(conn, &tcp_ctask->sendbuf, + &ctask->data_count, &tcp_ctask->sent)) { + ctask->unsol_count -= tcp_ctask->sent - start; + tcp_ctask->xmstate |= XMSTATE_UNS_DATA; /* will continue with this ctask later.. */ if (conn->datadgst_en) { - crypto_digest_final(conn->data_tx_tfm, + crypto_digest_final(tcp_conn->data_tx_tfm, (u8 *)&dtask->digest); debug_tcp("tx uns data fail 0x%x\n", dtask->digest); @@ -1856,21 +1590,21 @@ handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) return -EAGAIN; } - BUG_ON(ctask->sent > ctask->total_length); - ctask->unsol_count -= ctask->sent - start; + BUG_ON(tcp_ctask->sent > ctask->total_length); + ctask->unsol_count -= tcp_ctask->sent - start; /* * XXX:we may run here with un-initial sendbuf. * so pass it */ - if (conn->datadgst_en && ctask->sent - start > 0) - crypto_digest_update(conn->data_tx_tfm, - &ctask->sendbuf.sg, 1); + if (conn->datadgst_en && tcp_ctask->sent - start > 0) + crypto_digest_update(tcp_conn->data_tx_tfm, + &tcp_ctask->sendbuf.sg, 1); if (!ctask->data_count) break; - iscsi_buf_init_sg(&ctask->sendbuf, - &ctask->sg[ctask->sg_count++]); + iscsi_buf_init_sg(&tcp_ctask->sendbuf, + &tcp_ctask->sg[tcp_ctask->sg_count++]); } BUG_ON(ctask->unsol_count < 0); @@ -1890,11 +1624,11 @@ handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) debug_tcp("sending uns digest 0x%x, more uns\n", dtask->digest); } - ctask->xmstate |= XMSTATE_UNS_INIT; + tcp_ctask->xmstate |= XMSTATE_UNS_INIT; return 1; } - if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) { + if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, &dtask->digest, 1)) { @@ -1912,15 +1646,17 @@ static inline int handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { struct iscsi_session *session = conn->session; - struct iscsi_r2t_info *r2t = ctask->r2t; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_r2t_info *r2t = tcp_ctask->r2t; struct iscsi_data_task *dtask = r2t->dtask; int left; - ctask->xmstate &= ~XMSTATE_SOL_DATA; - ctask->dtask = dtask; + tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; + tcp_ctask->dtask = dtask; if (conn->datadgst_en) { - iscsi_data_digest_init(conn, ctask); + iscsi_data_digest_init(tcp_conn, ctask); dtask->digest = 0; } solicit_again: @@ -1931,10 +1667,10 @@ solicit_again: goto data_out_done; if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) { - ctask->xmstate |= XMSTATE_SOL_DATA; + tcp_ctask->xmstate |= XMSTATE_SOL_DATA; /* will continue with this ctask later.. */ if (conn->datadgst_en) { - crypto_digest_final(conn->data_tx_tfm, + crypto_digest_final(tcp_conn->data_tx_tfm, (u8 *)&dtask->digest); debug_tcp("r2t data send fail 0x%x\n", dtask->digest); } @@ -1943,12 +1679,13 @@ solicit_again: BUG_ON(r2t->data_count < 0); if (conn->datadgst_en) - crypto_digest_update(conn->data_tx_tfm, &r2t->sendbuf.sg, 1); + crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg, + 1); if (r2t->data_count) { BUG_ON(ctask->sc->use_sg == 0); if (!iscsi_buf_left(&r2t->sendbuf)) { - BUG_ON(ctask->bad_sg == r2t->sg); + BUG_ON(tcp_ctask->bad_sg == r2t->sg); iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); r2t->sg += 1; } @@ -1975,8 +1712,8 @@ data_out_done: dtask->digest); } iscsi_solicit_data_cont(conn, ctask, r2t, left); - ctask->xmstate |= XMSTATE_SOL_DATA; - ctask->xmstate &= ~XMSTATE_SOL_HDR; + tcp_ctask->xmstate |= XMSTATE_SOL_DATA; + tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; return 1; } @@ -1984,7 +1721,7 @@ data_out_done: * Done with this R2T. Check if there are more * outstanding R2Ts ready to be processed. */ - BUG_ON(ctask->r2t_data_count - r2t->data_length < 0); + BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0); if (conn->datadgst_en) { if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, &dtask->digest, 1)) { @@ -1995,15 +1732,15 @@ data_out_done: debug_tcp("r2t done dout digest 0x%x\n", dtask->digest); } - ctask->r2t_data_count -= r2t->data_length; - ctask->r2t = NULL; + tcp_ctask->r2t_data_count -= r2t->data_length; + tcp_ctask->r2t = NULL; spin_lock_bh(&session->lock); - __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); + __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); spin_unlock_bh(&session->lock); - if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { - ctask->r2t = r2t; - ctask->xmstate |= XMSTATE_SOL_DATA; - ctask->xmstate &= ~XMSTATE_SOL_HDR; + if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { + tcp_ctask->r2t = r2t; + tcp_ctask->xmstate |= XMSTATE_SOL_DATA; + tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; return 1; } @@ -2013,29 +1750,34 @@ data_out_done: static inline int handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { - struct iscsi_data_task *dtask = ctask->dtask; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_data_task *dtask = tcp_ctask->dtask; int sent; - ctask->xmstate &= ~XMSTATE_W_PAD; - iscsi_buf_init_virt(&ctask->sendbuf, (char*)&ctask->pad, - ctask->pad_count); - if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->pad_count, &sent)) { - ctask->xmstate |= XMSTATE_W_PAD; + tcp_ctask->xmstate &= ~XMSTATE_W_PAD; + iscsi_buf_init_virt(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, + tcp_ctask->pad_count); + if (iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, + &sent)) { + tcp_ctask->xmstate |= XMSTATE_W_PAD; return -EAGAIN; } if (conn->datadgst_en) { - crypto_digest_update(conn->data_tx_tfm, &ctask->sendbuf.sg, 1); + crypto_digest_update(tcp_conn->data_tx_tfm, + &tcp_ctask->sendbuf.sg, 1); /* imm data? */ if (!dtask) { - if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf, - &ctask->immdigest, 1)) { + if (iscsi_digest_final_send(conn, ctask, + &tcp_ctask->immbuf, + &tcp_ctask->immdigest, 1)) { debug_tcp("send padding digest 0x%x" - "fail!\n", ctask->immdigest); + "fail!\n", tcp_ctask->immdigest); return -EAGAIN; } debug_tcp("done with padding, digest 0x%x\n", - ctask->datadigest); + tcp_ctask->datadigest); } else { if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, @@ -2053,12 +1795,13 @@ handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) } static int -iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; int rc = 0; debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", - conn->id, ctask->xmstate, ctask->itt); + conn->id, tcp_ctask->xmstate, ctask->itt); /* * serialize with TMF AbortTask @@ -2066,40 +1809,40 @@ iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) if (ctask->mtask) return rc; - if (ctask->xmstate & XMSTATE_R_HDR) { - rc = handle_xmstate_r_hdr(conn, ctask); + if (tcp_ctask->xmstate & XMSTATE_R_HDR) { + rc = handle_xmstate_r_hdr(conn, tcp_ctask); return rc; } - if (ctask->xmstate & XMSTATE_W_HDR) { + if (tcp_ctask->xmstate & XMSTATE_W_HDR) { rc = handle_xmstate_w_hdr(conn, ctask); if (rc) return rc; } /* XXX: for data digest xmit recover */ - if (ctask->xmstate & XMSTATE_DATA_DIGEST) { + if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) { rc = handle_xmstate_data_digest(conn, ctask); if (rc) return rc; } - if (ctask->xmstate & XMSTATE_IMM_DATA) { + if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { rc = handle_xmstate_imm_data(conn, ctask); if (rc) return rc; } - if (ctask->xmstate & XMSTATE_UNS_HDR) { + if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { BUG_ON(!ctask->unsol_count); - ctask->xmstate &= ~XMSTATE_UNS_HDR; + tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; unsolicit_head_again: rc = handle_xmstate_uns_hdr(conn, ctask); if (rc) return rc; } - if (ctask->xmstate & XMSTATE_UNS_DATA) { + if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { rc = handle_xmstate_uns_data(conn, ctask); if (rc == 1) goto unsolicit_head_again; @@ -2108,22 +1851,22 @@ unsolicit_head_again: goto done; } - if (ctask->xmstate & XMSTATE_SOL_HDR) { + if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { struct iscsi_r2t_info *r2t; - ctask->xmstate &= ~XMSTATE_SOL_HDR; - ctask->xmstate |= XMSTATE_SOL_DATA; - if (!ctask->r2t) - __kfifo_get(ctask->r2tqueue, (void*)&ctask->r2t, + tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; + tcp_ctask->xmstate |= XMSTATE_SOL_DATA; + if (!tcp_ctask->r2t) + __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, sizeof(void*)); solicit_head_again: - r2t = ctask->r2t; + r2t = tcp_ctask->r2t; if (conn->hdrdgst_en) iscsi_hdr_digest(conn, &r2t->headbuf, (u8*)r2t->dtask->hdrext); if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) { - ctask->xmstate &= ~XMSTATE_SOL_DATA; - ctask->xmstate |= XMSTATE_SOL_HDR; + tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; + tcp_ctask->xmstate |= XMSTATE_SOL_HDR; return -EAGAIN; } @@ -2132,7 +1875,7 @@ solicit_head_again: r2t->sent); } - if (ctask->xmstate & XMSTATE_SOL_DATA) { + if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { rc = handle_xmstate_sol_data(conn, ctask); if (rc == 1) goto solicit_head_again; @@ -2145,490 +1888,98 @@ done: * Last thing to check is whether we need to send write * padding. Note that we check for xmstate equality, not just the bit. */ - if (ctask->xmstate == XMSTATE_W_PAD) + if (tcp_ctask->xmstate == XMSTATE_W_PAD) rc = handle_xmstate_w_pad(conn, ctask); return rc; } -/** - * iscsi_data_xmit - xmit any command into the scheduled connection - * @conn: iscsi connection - * - * Notes: - * The function can return -EAGAIN in which case the caller must - * re-schedule it again later or recover. '0' return code means - * successful xmit. - **/ -static int -iscsi_data_xmit(struct iscsi_conn *conn) -{ - if (unlikely(conn->suspend_tx)) { - debug_tcp("conn %d Tx suspended!\n", conn->id); - return 0; - } - - /* - * Transmit in the following order: - * - * 1) un-finished xmit (ctask or mtask) - * 2) immediate control PDUs - * 3) write data - * 4) SCSI commands - * 5) non-immediate control PDUs - * - * No need to lock around __kfifo_get as long as - * there's one producer and one consumer. - */ - - BUG_ON(conn->ctask && conn->mtask); - - if (conn->ctask) { - if (iscsi_ctask_xmit(conn, conn->ctask)) - goto again; - /* done with this in-progress ctask */ - conn->ctask = NULL; - } - if (conn->mtask) { - if (iscsi_mtask_xmit(conn, conn->mtask)) - goto again; - /* done with this in-progress mtask */ - conn->mtask = NULL; - } - - /* process immediate first */ - if (unlikely(__kfifo_len(conn->immqueue))) { - struct iscsi_session *session = conn->session; - while (__kfifo_get(conn->immqueue, (void*)&conn->mtask, - sizeof(void*))) { - if (iscsi_mtask_xmit(conn, conn->mtask)) - goto again; - - if (conn->mtask->hdr.itt == - cpu_to_be32(ISCSI_RESERVED_TAG)) { - spin_lock_bh(&session->lock); - __kfifo_put(session->mgmtpool.queue, - (void*)&conn->mtask, sizeof(void*)); - spin_unlock_bh(&session->lock); - } - } - /* done with this mtask */ - conn->mtask = NULL; - } - - /* process write queue */ - while (__kfifo_get(conn->writequeue, (void*)&conn->ctask, - sizeof(void*))) { - if (iscsi_ctask_xmit(conn, conn->ctask)) - goto again; - } - - /* process command queue */ - while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask, - sizeof(void*))) { - if (iscsi_ctask_xmit(conn, conn->ctask)) - goto again; - } - /* done with this ctask */ - conn->ctask = NULL; - - /* process the rest control plane PDUs, if any */ - if (unlikely(__kfifo_len(conn->mgmtqueue))) { - struct iscsi_session *session = conn->session; - - while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, - sizeof(void*))) { - if (iscsi_mtask_xmit(conn, conn->mtask)) - goto again; - - if (conn->mtask->hdr.itt == - cpu_to_be32(ISCSI_RESERVED_TAG)) { - spin_lock_bh(&session->lock); - __kfifo_put(session->mgmtpool.queue, - (void*)&conn->mtask, - sizeof(void*)); - spin_unlock_bh(&session->lock); - } - } - /* done with this mtask */ - conn->mtask = NULL; - } - - return 0; - -again: - if (unlikely(conn->suspend_tx)) - return 0; - - return -EAGAIN; -} - -static void -iscsi_xmitworker(void *data) -{ - struct iscsi_conn *conn = data; - - /* - * serialize Xmit worker on a per-connection basis. - */ - mutex_lock(&conn->xmitmutex); - if (iscsi_data_xmit(conn)) - scsi_queue_work(conn->session->host, &conn->xmitwork); - mutex_unlock(&conn->xmitmutex); -} - -#define FAILURE_BAD_HOST 1 -#define FAILURE_SESSION_FAILED 2 -#define FAILURE_SESSION_FREED 3 -#define FAILURE_WINDOW_CLOSED 4 -#define FAILURE_SESSION_TERMINATE 5 - -static int -iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) -{ - struct Scsi_Host *host; - int reason = 0; - struct iscsi_session *session; - struct iscsi_conn *conn = NULL; - struct iscsi_cmd_task *ctask = NULL; - - sc->scsi_done = done; - sc->result = 0; - - host = sc->device->host; - session = iscsi_hostdata(host->hostdata); - BUG_ON(host != session->host); - - spin_lock(&session->lock); - - if (session->state != ISCSI_STATE_LOGGED_IN) { - if (session->state == ISCSI_STATE_FAILED) { - reason = FAILURE_SESSION_FAILED; - goto reject; - } else if (session->state == ISCSI_STATE_TERMINATE) { - reason = FAILURE_SESSION_TERMINATE; - goto fault; - } - reason = FAILURE_SESSION_FREED; - goto fault; - } - - /* - * Check for iSCSI window and take care of CmdSN wrap-around - */ - if ((int)(session->max_cmdsn - session->cmdsn) < 0) { - reason = FAILURE_WINDOW_CLOSED; - goto reject; - } - - conn = session->leadconn; - - __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); - BUG_ON(ctask->sc); - - sc->SCp.phase = session->age; - sc->SCp.ptr = (char*)ctask; - iscsi_cmd_init(conn, ctask, sc); - - __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*)); - debug_scsi( - "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n", - sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", - conn->id, (long)sc, ctask->itt, sc->request_bufflen, - session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); - spin_unlock(&session->lock); - - scsi_queue_work(host, &conn->xmitwork); - return 0; - -reject: - spin_unlock(&session->lock); - debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); - return SCSI_MLQUEUE_HOST_BUSY; - -fault: - spin_unlock(&session->lock); - printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n", - sc->cmnd[0], reason); - sc->sense_buffer[0] = 0x70; - sc->sense_buffer[2] = NOT_READY; - sc->sense_buffer[7] = 0x6; - sc->sense_buffer[12] = 0x08; - sc->sense_buffer[13] = 0x00; - sc->result = (DID_NO_CONNECT << 16); - sc->resid = sc->request_bufflen; - sc->scsi_done(sc); - return 0; -} - -static int -iscsi_change_queue_depth(struct scsi_device *sdev, int depth) -{ - if (depth > ISCSI_MAX_CMD_PER_LUN) - depth = ISCSI_MAX_CMD_PER_LUN; - scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); - return sdev->queue_depth; -} - -static int -iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) -{ - int i; - - *items = kmalloc(max * sizeof(void*), GFP_KERNEL); - if (*items == NULL) - return -ENOMEM; - - q->max = max; - q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); - if (q->pool == NULL) { - kfree(*items); - return -ENOMEM; - } - - q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), - GFP_KERNEL, NULL); - if (q->queue == ERR_PTR(-ENOMEM)) { - kfree(q->pool); - kfree(*items); - return -ENOMEM; - } - - for (i = 0; i < max; i++) { - q->pool[i] = kmalloc(item_size, GFP_KERNEL); - if (q->pool[i] == NULL) { - int j; - - for (j = 0; j < i; j++) - kfree(q->pool[j]); - - kfifo_free(q->queue); - kfree(q->pool); - kfree(*items); - return -ENOMEM; - } - memset(q->pool[i], 0, item_size); - (*items)[i] = q->pool[i]; - __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); - } - return 0; -} - -static void -iscsi_pool_free(struct iscsi_queue *q, void **items) -{ - int i; - - for (i = 0; i < q->max; i++) - kfree(items[i]); - kfree(q->pool); - kfree(items); -} - static struct iscsi_cls_conn * -iscsi_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) +iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) { - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); struct iscsi_conn *conn; struct iscsi_cls_conn *cls_conn; + struct iscsi_tcp_conn *tcp_conn; - cls_conn = iscsi_create_conn(cls_session, conn_idx); + cls_conn = iscsi_conn_setup(cls_session, conn_idx); if (!cls_conn) return NULL; conn = cls_conn->dd_data; - memset(conn, 0, sizeof(*conn)); - - conn->cls_conn = cls_conn; - conn->c_stage = ISCSI_CONN_INITIAL_STAGE; - conn->in_progress = IN_PROGRESS_WAIT_HEADER; - conn->id = conn_idx; - conn->exp_statsn = 0; - conn->tmabort_state = TMABORT_INITIAL; - - /* initial operational parameters */ - conn->hdr_size = sizeof(struct iscsi_hdr); - conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; + /* + * due to strange issues with iser these are not set + * in iscsi_conn_setup + */ conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; - /* initialize general xmit PDU commands queue */ - conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->xmitqueue == ERR_PTR(-ENOMEM)) - goto xmitqueue_alloc_fail; - - /* initialize write response PDU commands queue */ - conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->writequeue == ERR_PTR(-ENOMEM)) - goto writequeue_alloc_fail; - - /* initialize general immediate & non-immediate PDU commands queue */ - conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->immqueue == ERR_PTR(-ENOMEM)) - goto immqueue_alloc_fail; - - conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) - goto mgmtqueue_alloc_fail; + tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); + if (!tcp_conn) + goto tcp_conn_alloc_fail; - INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn); - - /* allocate login_mtask used for the login/text sequences */ - spin_lock_bh(&session->lock); - if (!__kfifo_get(session->mgmtpool.queue, - (void*)&conn->login_mtask, - sizeof(void*))) { - spin_unlock_bh(&session->lock); - goto login_mtask_alloc_fail; - } - spin_unlock_bh(&session->lock); + conn->dd_data = tcp_conn; + tcp_conn->iscsi_conn = conn; + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; + /* initial operational parameters */ + tcp_conn->hdr_size = sizeof(struct iscsi_hdr); + tcp_conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; /* allocate initial PDU receive place holder */ - if (conn->data_size <= PAGE_SIZE) - conn->data = kmalloc(conn->data_size, GFP_KERNEL); + if (tcp_conn->data_size <= PAGE_SIZE) + tcp_conn->data = kmalloc(tcp_conn->data_size, GFP_KERNEL); else - conn->data = (void*)__get_free_pages(GFP_KERNEL, - get_order(conn->data_size)); - if (!conn->data) + tcp_conn->data = (void*)__get_free_pages(GFP_KERNEL, + get_order(tcp_conn->data_size)); + if (!tcp_conn->data) goto max_recv_dlenght_alloc_fail; - init_timer(&conn->tmabort_timer); - mutex_init(&conn->xmitmutex); - init_waitqueue_head(&conn->ehwait); - return cls_conn; max_recv_dlenght_alloc_fail: - spin_lock_bh(&session->lock); - __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, - sizeof(void*)); - spin_unlock_bh(&session->lock); -login_mtask_alloc_fail: - kfifo_free(conn->mgmtqueue); -mgmtqueue_alloc_fail: - kfifo_free(conn->immqueue); -immqueue_alloc_fail: - kfifo_free(conn->writequeue); -writequeue_alloc_fail: - kfifo_free(conn->xmitqueue); -xmitqueue_alloc_fail: - iscsi_destroy_conn(cls_conn); + kfree(tcp_conn); +tcp_conn_alloc_fail: + iscsi_conn_teardown(cls_conn); return NULL; } static void -iscsi_conn_destroy(struct iscsi_cls_conn *cls_conn) +iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) { struct iscsi_conn *conn = cls_conn->dd_data; - struct iscsi_session *session = conn->session; - unsigned long flags; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + int digest = 0; - mutex_lock(&conn->xmitmutex); - set_bit(SUSPEND_BIT, &conn->suspend_tx); - if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE && conn->sock) { - struct sock *sk = conn->sock->sk; + if (conn->hdrdgst_en || conn->datadgst_en) + digest = 1; - /* - * conn_start() has never been called! - * need to cleanup the socket. - */ - write_lock_bh(&sk->sk_callback_lock); - set_bit(SUSPEND_BIT, &conn->suspend_rx); - write_unlock_bh(&sk->sk_callback_lock); + iscsi_conn_teardown(cls_conn); - sock_hold(conn->sock->sk); - iscsi_conn_restore_callbacks(conn); - sock_put(conn->sock->sk); - sock_release(conn->sock); - conn->sock = NULL; - } - - spin_lock_bh(&session->lock); - conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; - if (session->leadconn == conn) { - /* - * leading connection? then give up on recovery. - */ - session->state = ISCSI_STATE_TERMINATE; - wake_up(&conn->ehwait); - } - spin_unlock_bh(&session->lock); - - mutex_unlock(&conn->xmitmutex); - - /* - * Block until all in-progress commands for this connection - * time out or fail. - */ - for (;;) { - spin_lock_irqsave(session->host->host_lock, flags); - if (!session->host->host_busy) { /* OK for ERL == 0 */ - spin_unlock_irqrestore(session->host->host_lock, flags); - break; - } - spin_unlock_irqrestore(session->host->host_lock, flags); - msleep_interruptible(500); - printk("conn_destroy(): host_busy %d host_failed %d\n", - session->host->host_busy, session->host->host_failed); - /* - * force eh_abort() to unblock - */ - wake_up(&conn->ehwait); - } - - /* now free crypto */ - if (conn->hdrdgst_en || conn->datadgst_en) { - if (conn->tx_tfm) - crypto_free_tfm(conn->tx_tfm); - if (conn->rx_tfm) - crypto_free_tfm(conn->rx_tfm); - if (conn->data_tx_tfm) - crypto_free_tfm(conn->data_tx_tfm); - if (conn->data_rx_tfm) - crypto_free_tfm(conn->data_rx_tfm); + /* now free tcp_conn */ + if (digest) { + if (tcp_conn->tx_tfm) + crypto_free_tfm(tcp_conn->tx_tfm); + if (tcp_conn->rx_tfm) + crypto_free_tfm(tcp_conn->rx_tfm); + if (tcp_conn->data_tx_tfm) + crypto_free_tfm(tcp_conn->data_tx_tfm); + if (tcp_conn->data_rx_tfm) + crypto_free_tfm(tcp_conn->data_rx_tfm); } /* free conn->data, size = MaxRecvDataSegmentLength */ - if (conn->data_size <= PAGE_SIZE) - kfree(conn->data); + if (tcp_conn->data_size <= PAGE_SIZE) + kfree(tcp_conn->data); else - free_pages((unsigned long)conn->data, - get_order(conn->data_size)); - - spin_lock_bh(&session->lock); - __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, - sizeof(void*)); - list_del(&conn->item); - if (list_empty(&session->connections)) - session->leadconn = NULL; - if (session->leadconn && session->leadconn == conn) - session->leadconn = container_of(session->connections.next, - struct iscsi_conn, item); - - if (session->leadconn == NULL) - /* none connections exits.. reset sequencing */ - session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; - spin_unlock_bh(&session->lock); - - kfifo_free(conn->xmitqueue); - kfifo_free(conn->writequeue); - kfifo_free(conn->immqueue); - kfifo_free(conn->mgmtqueue); - - iscsi_destroy_conn(cls_conn); + free_pages((unsigned long)tcp_conn->data, + get_order(tcp_conn->data_size)); + kfree(tcp_conn); } static int -iscsi_conn_bind(struct iscsi_cls_session *cls_session, - struct iscsi_cls_conn *cls_conn, uint32_t transport_fd, - int is_leading) +iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, + struct iscsi_cls_conn *cls_conn, uint32_t transport_fd, + int is_leading) { - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); - struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data; + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; struct sock *sk; struct socket *sock; int err; @@ -2640,32 +1991,13 @@ iscsi_conn_bind(struct iscsi_cls_session *cls_session, return -EEXIST; } - /* lookup for existing connection */ - spin_lock_bh(&session->lock); - list_for_each_entry(tmp, &session->connections, item) { - if (tmp == conn) { - if (conn->c_stage != ISCSI_CONN_STOPPED || - conn->stop_stage == STOP_CONN_TERM) { - printk(KERN_ERR "iscsi_tcp: can't bind " - "non-stopped connection (%d:%d)\n", - conn->c_stage, conn->stop_stage); - spin_unlock_bh(&session->lock); - return -EIO; - } - break; - } - } - if (tmp != conn) { - /* bind new iSCSI connection to session */ - conn->session = session; - - list_add(&conn->item, &session->connections); - } - spin_unlock_bh(&session->lock); + err = iscsi_conn_bind(cls_session, cls_conn, is_leading); + if (err) + return err; if (conn->stop_stage != STOP_CONN_SUSPEND) { /* bind iSCSI connection and socket */ - conn->sock = sock; + tcp_conn->sock = sock; /* setup Socket parameters */ sk = sock->sk; @@ -2679,488 +2011,78 @@ iscsi_conn_bind(struct iscsi_cls_session *cls_session, * Intercept TCP callbacks for sendfile like receive * processing. */ + conn->recv_lock = &sk->sk_callback_lock; iscsi_conn_set_callbacks(conn); - - conn->sendpage = conn->sock->ops->sendpage; - + tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; /* * set receive state machine into initial state */ - conn->in_progress = IN_PROGRESS_WAIT_HEADER; + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; } - if (is_leading) - session->leadconn = conn; - - /* - * Unblock xmitworker(), Login Phase will pass through. - */ - clear_bit(SUSPEND_BIT, &conn->suspend_rx); - clear_bit(SUSPEND_BIT, &conn->suspend_tx); - return 0; } -static int -iscsi_conn_start(struct iscsi_cls_conn *cls_conn) +static void +iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { - struct iscsi_conn *conn = cls_conn->dd_data; - struct iscsi_session *session = conn->session; - struct sock *sk; - - /* FF phase warming up... */ - - if (session == NULL) { - printk(KERN_ERR "iscsi_tcp: can't start unbound connection\n"); - return -EPERM; - } - - sk = conn->sock->sk; - - write_lock_bh(&sk->sk_callback_lock); - spin_lock_bh(&session->lock); - conn->c_stage = ISCSI_CONN_STARTED; - session->state = ISCSI_STATE_LOGGED_IN; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_r2t_info *r2t; - switch(conn->stop_stage) { - case STOP_CONN_RECOVER: - /* - * unblock eh_abort() if it is blocked. re-try all - * commands after successful recovery - */ - session->conn_cnt++; - conn->stop_stage = 0; - conn->tmabort_state = TMABORT_INITIAL; - session->age++; - wake_up(&conn->ehwait); - break; - case STOP_CONN_TERM: - session->conn_cnt++; - conn->stop_stage = 0; - break; - case STOP_CONN_SUSPEND: - conn->stop_stage = 0; - clear_bit(SUSPEND_BIT, &conn->suspend_rx); - clear_bit(SUSPEND_BIT, &conn->suspend_tx); - break; - default: - break; - } - spin_unlock_bh(&session->lock); - write_unlock_bh(&sk->sk_callback_lock); + /* flush ctask's r2t queues */ + while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) + __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, + sizeof(void*)); - return 0; + __iscsi_ctask_cleanup(conn, ctask); } static void -iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) +iscsi_tcp_suspend_conn_rx(struct iscsi_conn *conn) { - struct iscsi_conn *conn = cls_conn->dd_data; - struct iscsi_session *session = conn->session; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; struct sock *sk; - unsigned long flags; - BUG_ON(!conn->sock); - sk = conn->sock->sk; + if (!tcp_conn->sock) + return; + + sk = tcp_conn->sock->sk; write_lock_bh(&sk->sk_callback_lock); - set_bit(SUSPEND_BIT, &conn->suspend_rx); + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); write_unlock_bh(&sk->sk_callback_lock); - - mutex_lock(&conn->xmitmutex); - - spin_lock_irqsave(session->host->host_lock, flags); - spin_lock(&session->lock); - conn->stop_stage = flag; - conn->c_stage = ISCSI_CONN_STOPPED; - set_bit(SUSPEND_BIT, &conn->suspend_tx); - - if (flag != STOP_CONN_SUSPEND) - session->conn_cnt--; - - if (session->conn_cnt == 0 || session->leadconn == conn) - session->state = ISCSI_STATE_FAILED; - - spin_unlock(&session->lock); - spin_unlock_irqrestore(session->host->host_lock, flags); - - if (flag == STOP_CONN_TERM || flag == STOP_CONN_RECOVER) { - struct iscsi_cmd_task *ctask; - struct iscsi_mgmt_task *mtask; - - /* - * Socket must go now. - */ - sock_hold(conn->sock->sk); - iscsi_conn_restore_callbacks(conn); - sock_put(conn->sock->sk); - - /* - * flush xmit queues. - */ - spin_lock_bh(&session->lock); - while (__kfifo_get(conn->writequeue, (void*)&ctask, - sizeof(void*)) || - __kfifo_get(conn->xmitqueue, (void*)&ctask, - sizeof(void*))) { - struct iscsi_r2t_info *r2t; - - /* - * flush ctask's r2t queues - */ - while (__kfifo_get(ctask->r2tqueue, (void*)&r2t, - sizeof(void*))) - __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, - sizeof(void*)); - - spin_unlock_bh(&session->lock); - local_bh_disable(); - iscsi_ctask_cleanup(conn, ctask); - local_bh_enable(); - spin_lock_bh(&session->lock); - } - conn->ctask = NULL; - while (__kfifo_get(conn->immqueue, (void*)&mtask, - sizeof(void*)) || - __kfifo_get(conn->mgmtqueue, (void*)&mtask, - sizeof(void*))) { - __kfifo_put(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*)); - } - conn->mtask = NULL; - spin_unlock_bh(&session->lock); - - /* - * release socket only after we stopped data_xmit() - * activity and flushed all outstandings - */ - sock_release(conn->sock); - conn->sock = NULL; - - /* - * for connection level recovery we should not calculate - * header digest. conn->hdr_size used for optimization - * in hdr_extract() and will be re-negotiated at - * set_param() time. - */ - if (flag == STOP_CONN_RECOVER) { - conn->hdr_size = sizeof(struct iscsi_hdr); - conn->hdrdgst_en = 0; - conn->datadgst_en = 0; - } - } - mutex_unlock(&conn->xmitmutex); -} - -static int -iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, - char *data, uint32_t data_size) -{ - struct iscsi_session *session = conn->session; - struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; - struct iscsi_mgmt_task *mtask; - - spin_lock_bh(&session->lock); - if (session->state == ISCSI_STATE_TERMINATE) { - spin_unlock_bh(&session->lock); - return -EPERM; - } - if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || - hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) - /* - * Login and Text are sent serially, in - * request-followed-by-response sequence. - * Same mtask can be used. Same ITT must be used. - * Note that login_mtask is preallocated at conn_create(). - */ - mtask = conn->login_mtask; - else { - BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); - BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); - - if (!__kfifo_get(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*))) { - spin_unlock_bh(&session->lock); - return -ENOSPC; - } - } - - /* - * pre-format CmdSN and ExpStatSN for outgoing PDU. - */ - if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { - hdr->itt = mtask->itt | (conn->id << CID_SHIFT) | - (session->age << AGE_SHIFT); - nop->cmdsn = cpu_to_be32(session->cmdsn); - if (conn->c_stage == ISCSI_CONN_STARTED && - !(hdr->opcode & ISCSI_OP_IMMEDIATE)) - session->cmdsn++; - } else - /* do not advance CmdSN */ - nop->cmdsn = cpu_to_be32(session->cmdsn); - - nop->exp_statsn = cpu_to_be32(conn->exp_statsn); - - memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr)); - - iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr, - sizeof(struct iscsi_hdr)); - - spin_unlock_bh(&session->lock); - - if (data_size) { - memcpy(mtask->data, data, data_size); - mtask->data_count = data_size; - } else - mtask->data_count = 0; - - mtask->xmstate = XMSTATE_IMM_HDR; - - if (mtask->data_count) { - iscsi_buf_init_iov(&mtask->sendbuf, (char*)mtask->data, - mtask->data_count); - } - - debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", - hdr->opcode, hdr->itt, data_size); - - /* - * since send_pdu() could be called at least from two contexts, - * we need to serialize __kfifo_put, so we don't have to take - * additional lock on fast data-path - */ - if (hdr->opcode & ISCSI_OP_IMMEDIATE) - __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); - else - __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); - - scsi_queue_work(session->host, &conn->xmitwork); - return 0; } -static int -iscsi_eh_host_reset(struct scsi_cmnd *sc) +static void +iscsi_tcp_terminate_conn(struct iscsi_conn *conn) { - struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; - spin_lock_bh(&session->lock); - if (session->state == ISCSI_STATE_TERMINATE) { - debug_scsi("failing host reset: session terminated " - "[CID %d age %d]", conn->id, session->age); - spin_unlock_bh(&session->lock); - return FAILED; - } - spin_unlock_bh(&session->lock); + if (!tcp_conn->sock) + return; - debug_scsi("failing connection CID %d due to SCSI host reset " - "[itt 0x%x age %d]", conn->id, ctask->itt, - session->age); - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + sock_hold(tcp_conn->sock->sk); + iscsi_conn_restore_callbacks(conn); + sock_put(tcp_conn->sock->sk); - return SUCCESS; + sock_release(tcp_conn->sock); + tcp_conn->sock = NULL; + conn->recv_lock = NULL; } +/* called with host lock */ static void -iscsi_tmabort_timedout(unsigned long data) -{ - struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; - - spin_lock(&session->lock); - if (conn->tmabort_state == TMABORT_INITIAL) { - __kfifo_put(session->mgmtpool.queue, - (void*)&ctask->mtask, sizeof(void*)); - conn->tmabort_state = TMABORT_TIMEDOUT; - debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n", - (long)ctask->sc, ctask->itt); - /* unblock eh_abort() */ - wake_up(&conn->ehwait); - } - spin_unlock(&session->lock); -} - -static int -iscsi_eh_abort(struct scsi_cmnd *sc) +iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask, + char *data, uint32_t data_size) { - int rc; - struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; - - conn->eh_abort_cnt++; - debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); - - /* - * two cases for ERL=0 here: - * - * 1) connection-level failure; - * 2) recovery due protocol error; - */ - mutex_lock(&conn->xmitmutex); - spin_lock_bh(&session->lock); - if (session->state != ISCSI_STATE_LOGGED_IN) { - if (session->state == ISCSI_STATE_TERMINATE) { - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - goto failed; - } - spin_unlock_bh(&session->lock); - } else { - struct iscsi_tm *hdr = &conn->tmhdr; - - /* - * Still LOGGED_IN... - */ - - if (!ctask->sc || sc->SCp.phase != session->age) { - /* - * 1) ctask completed before time out. But session - * is still ok => Happy Retry. - * 2) session was re-open during time out of ctask. - */ - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - goto success; - } - conn->tmabort_state = TMABORT_INITIAL; - spin_unlock_bh(&session->lock); + struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; - /* - * ctask timed out but session is OK - * ERL=0 requires task mgmt abort to be issued on each - * failed command. requests must be serialized. - */ - memset(hdr, 0, sizeof(struct iscsi_tm)); - hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; - hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; - hdr->flags |= ISCSI_FLAG_CMD_FINAL; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->rtt = ctask->hdr.itt; - hdr->refcmdsn = ctask->hdr.cmdsn; - - rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, - NULL, 0); - if (rc) { - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - debug_scsi("abort sent failure [itt 0x%x]", ctask->itt); - } else { - struct iscsi_r2t_info *r2t; - - /* - * TMF abort vs. TMF response race logic - */ - spin_lock_bh(&session->lock); - ctask->mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[(hdr->itt & ITT_MASK) - - ISCSI_MGMT_ITT_OFFSET]; - /* - * have to flush r2tqueue to avoid r2t leaks - */ - while (__kfifo_get(ctask->r2tqueue, (void*)&r2t, - sizeof(void*))) { - __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, - sizeof(void*)); - } - if (conn->tmabort_state == TMABORT_INITIAL) { - conn->tmfcmd_pdus_cnt++; - conn->tmabort_timer.expires = 3*HZ + jiffies; - conn->tmabort_timer.function = - iscsi_tmabort_timedout; - conn->tmabort_timer.data = (unsigned long)ctask; - add_timer(&conn->tmabort_timer); - debug_scsi("abort sent [itt 0x%x]", ctask->itt); - } else { - if (!ctask->sc || - conn->tmabort_state == TMABORT_SUCCESS) { - conn->tmabort_state = TMABORT_INITIAL; - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - goto success; - } - conn->tmabort_state = TMABORT_INITIAL; - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - } - spin_unlock_bh(&session->lock); - } - } - mutex_unlock(&conn->xmitmutex); - - - /* - * block eh thread until: - * - * 1) abort response; - * 2) abort timeout; - * 3) session re-opened; - * 4) session terminated; - */ - for (;;) { - int p_state = session->state; - - rc = wait_event_interruptible(conn->ehwait, - (p_state == ISCSI_STATE_LOGGED_IN ? - (session->state == ISCSI_STATE_TERMINATE || - conn->tmabort_state != TMABORT_INITIAL) : - (session->state == ISCSI_STATE_TERMINATE || - session->state == ISCSI_STATE_LOGGED_IN))); - if (rc) { - /* shutdown.. */ - session->state = ISCSI_STATE_TERMINATE; - goto failed; - } - - if (signal_pending(current)) - flush_signals(current); - - if (session->state == ISCSI_STATE_TERMINATE) - goto failed; - - spin_lock_bh(&session->lock); - if (sc->SCp.phase == session->age && - (conn->tmabort_state == TMABORT_TIMEDOUT || - conn->tmabort_state == TMABORT_FAILED)) { - conn->tmabort_state = TMABORT_INITIAL; - if (!ctask->sc) { - /* - * ctask completed before tmf abort response or - * time out. - * But session is still ok => Happy Retry. - */ - spin_unlock_bh(&session->lock); - break; - } - spin_unlock_bh(&session->lock); - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - continue; - } - spin_unlock_bh(&session->lock); - break; - } - -success: - debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); - rc = SUCCESS; - goto exit; - -failed: - debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); - rc = FAILED; - -exit: - del_timer_sync(&conn->tmabort_timer); - - mutex_lock(&conn->xmitmutex); - if (conn->sock) { - struct sock *sk = conn->sock->sk; + iscsi_buf_init_virt(&tcp_mtask->headbuf, (char*)mtask->hdr, + sizeof(struct iscsi_hdr)); + tcp_mtask->xmstate = XMSTATE_IMM_HDR; - write_lock_bh(&sk->sk_callback_lock); - iscsi_ctask_cleanup(conn, ctask); - write_unlock_bh(&sk->sk_callback_lock); - } - mutex_unlock(&conn->xmitmutex); - return rc; + if (mtask->data_count) + iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data, + mtask->data_count); } static int @@ -3174,6 +2096,7 @@ iscsi_r2tpool_alloc(struct iscsi_session *session) */ for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; /* * pre-allocated x4 as much r2ts to handle race when @@ -3182,16 +2105,18 @@ iscsi_r2tpool_alloc(struct iscsi_session *session) */ /* R2T pool */ - if (iscsi_pool_init(&ctask->r2tpool, session->max_r2t * 4, - (void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) { + if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, + (void***)&tcp_ctask->r2ts, + sizeof(struct iscsi_r2t_info))) { goto r2t_alloc_fail; } /* R2T xmit queue */ - ctask->r2tqueue = kfifo_alloc( + tcp_ctask->r2tqueue = kfifo_alloc( session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); - if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) { - iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts); + if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { + iscsi_pool_free(&tcp_ctask->r2tpool, + (void**)tcp_ctask->r2ts); goto r2t_alloc_fail; } @@ -3200,24 +2125,28 @@ iscsi_r2tpool_alloc(struct iscsi_session *session) * Data-Out PDU's within R2T-sequence can be quite big; * using mempool */ - ctask->datapool = mempool_create_slab_pool(ISCSI_DTASK_DEFAULT_MAX, - taskcache); - if (ctask->datapool == NULL) { - kfifo_free(ctask->r2tqueue); - iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts); + tcp_ctask->datapool = mempool_create_slab_pool(ISCSI_DTASK_DEFAULT_MAX, + taskcache); + if (tcp_ctask->datapool == NULL) { + kfifo_free(tcp_ctask->r2tqueue); + iscsi_pool_free(&tcp_ctask->r2tpool, + (void**)tcp_ctask->r2ts); goto r2t_alloc_fail; } - INIT_LIST_HEAD(&ctask->dataqueue); + INIT_LIST_HEAD(&tcp_ctask->dataqueue); } return 0; r2t_alloc_fail: for (i = 0; i < cmd_i; i++) { - mempool_destroy(session->cmds[i]->datapool); - kfifo_free(session->cmds[i]->r2tqueue); - iscsi_pool_free(&session->cmds[i]->r2tpool, - (void**)session->cmds[i]->r2ts); + struct iscsi_cmd_task *ctask = session->cmds[i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + mempool_destroy(tcp_ctask->datapool); + kfifo_free(tcp_ctask->r2tqueue); + iscsi_pool_free(&tcp_ctask->r2tpool, + (void**)tcp_ctask->r2ts); } return -ENOMEM; } @@ -3228,127 +2157,14 @@ iscsi_r2tpool_free(struct iscsi_session *session) int i; for (i = 0; i < session->cmds_max; i++) { - mempool_destroy(session->cmds[i]->datapool); - kfifo_free(session->cmds[i]->r2tqueue); - iscsi_pool_free(&session->cmds[i]->r2tpool, - (void**)session->cmds[i]->r2ts); - } -} - -static struct scsi_host_template iscsi_sht = { - .name = "iSCSI Initiator over TCP/IP, v." - ISCSI_VERSION_STR, - .queuecommand = iscsi_queuecommand, - .change_queue_depth = iscsi_change_queue_depth, - .can_queue = ISCSI_XMIT_CMDS_MAX - 1, - .sg_tablesize = ISCSI_SG_TABLESIZE, - .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, - .eh_abort_handler = iscsi_eh_abort, - .eh_host_reset_handler = iscsi_eh_host_reset, - .use_clustering = DISABLE_CLUSTERING, - .proc_name = "iscsi_tcp", - .this_id = -1, -}; + struct iscsi_cmd_task *ctask = session->cmds[i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; -static struct iscsi_transport iscsi_tcp_transport; - -static struct iscsi_cls_session * -iscsi_session_create(struct scsi_transport_template *scsit, - uint32_t initial_cmdsn, uint32_t *sid) -{ - struct Scsi_Host *shost; - struct iscsi_session *session; - int cmd_i; - - shost = iscsi_transport_create_session(scsit, &iscsi_tcp_transport); - if (!shost) - return NULL; - - session = iscsi_hostdata(shost->hostdata); - memset(session, 0, sizeof(struct iscsi_session)); - session->host = shost; - session->state = ISCSI_STATE_FREE; - session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; - session->cmds_max = ISCSI_XMIT_CMDS_MAX; - session->cmdsn = initial_cmdsn; - session->exp_cmdsn = initial_cmdsn + 1; - session->max_cmdsn = initial_cmdsn + 1; - session->max_r2t = 1; - *sid = shost->host_no; - - /* initialize SCSI PDU commands pool */ - if (iscsi_pool_init(&session->cmdpool, session->cmds_max, - (void***)&session->cmds, sizeof(struct iscsi_cmd_task))) - goto cmdpool_alloc_fail; - - /* pre-format cmds pool with ITT */ - for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) - session->cmds[cmd_i]->itt = cmd_i; - - spin_lock_init(&session->lock); - INIT_LIST_HEAD(&session->connections); - - /* initialize immediate command pool */ - if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, - (void***)&session->mgmt_cmds, sizeof(struct iscsi_mgmt_task))) - goto mgmtpool_alloc_fail; - - - /* pre-format immediate cmds pool with ITT */ - for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { - session->mgmt_cmds[cmd_i]->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; - session->mgmt_cmds[cmd_i]->data = kmalloc( - DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL); - if (!session->mgmt_cmds[cmd_i]->data) { - int j; - - for (j = 0; j < cmd_i; j++) - kfree(session->mgmt_cmds[j]->data); - goto immdata_alloc_fail; - } + mempool_destroy(tcp_ctask->datapool); + kfifo_free(tcp_ctask->r2tqueue); + iscsi_pool_free(&tcp_ctask->r2tpool, + (void**)tcp_ctask->r2ts); } - - if (iscsi_r2tpool_alloc(session)) - goto r2tpool_alloc_fail; - - return hostdata_session(shost->hostdata); - -r2tpool_alloc_fail: - for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) - kfree(session->mgmt_cmds[cmd_i]->data); -immdata_alloc_fail: - iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); -mgmtpool_alloc_fail: - iscsi_pool_free(&session->cmdpool, (void**)session->cmds); -cmdpool_alloc_fail: - iscsi_transport_destroy_session(shost); - return NULL; -} - -static void -iscsi_session_destroy(struct iscsi_cls_session *cls_session) -{ - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); - int cmd_i; - struct iscsi_data_task *dtask, *n; - - for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { - struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; - list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) { - list_del(&dtask->item); - mempool_free(dtask, ctask->datapool); - } - } - - for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) - kfree(session->mgmt_cmds[cmd_i]->data); - - iscsi_r2tpool_free(session); - iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); - iscsi_pool_free(&session->cmdpool, (void**)session->cmds); - - iscsi_transport_destroy_session(shost); } static int @@ -3357,23 +2173,14 @@ iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, { struct iscsi_conn *conn = cls_conn->dd_data; struct iscsi_session *session = conn->session; - - spin_lock_bh(&session->lock); - if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && - conn->stop_stage != STOP_CONN_RECOVER) { - printk(KERN_ERR "iscsi_tcp: can not change parameter [%d]\n", - param); - spin_unlock_bh(&session->lock); - return 0; - } - spin_unlock_bh(&session->lock); + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; switch(param) { case ISCSI_PARAM_MAX_RECV_DLENGTH: { - char *saveptr = conn->data; + char *saveptr = tcp_conn->data; gfp_t flags = GFP_KERNEL; - if (conn->data_size >= value) { + if (tcp_conn->data_size >= value) { conn->max_recv_dlength = value; break; } @@ -3384,21 +2191,21 @@ iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, spin_unlock_bh(&session->lock); if (value <= PAGE_SIZE) - conn->data = kmalloc(value, flags); + tcp_conn->data = kmalloc(value, flags); else - conn->data = (void*)__get_free_pages(flags, + tcp_conn->data = (void*)__get_free_pages(flags, get_order(value)); - if (conn->data == NULL) { - conn->data = saveptr; + if (tcp_conn->data == NULL) { + tcp_conn->data = saveptr; return -ENOMEM; } - if (conn->data_size <= PAGE_SIZE) + if (tcp_conn->data_size <= PAGE_SIZE) kfree(saveptr); else free_pages((unsigned long)saveptr, - get_order(conn->data_size)); + get_order(tcp_conn->data_size)); conn->max_recv_dlength = value; - conn->data_size = value; + tcp_conn->data_size = value; } break; case ISCSI_PARAM_MAX_XMIT_DLENGTH: @@ -3406,49 +2213,51 @@ iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, break; case ISCSI_PARAM_HDRDGST_EN: conn->hdrdgst_en = value; - conn->hdr_size = sizeof(struct iscsi_hdr); + tcp_conn->hdr_size = sizeof(struct iscsi_hdr); if (conn->hdrdgst_en) { - conn->hdr_size += sizeof(__u32); - if (!conn->tx_tfm) - conn->tx_tfm = crypto_alloc_tfm("crc32c", 0); - if (!conn->tx_tfm) + tcp_conn->hdr_size += sizeof(__u32); + if (!tcp_conn->tx_tfm) + tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c", + 0); + if (!tcp_conn->tx_tfm) return -ENOMEM; - if (!conn->rx_tfm) - conn->rx_tfm = crypto_alloc_tfm("crc32c", 0); - if (!conn->rx_tfm) { - crypto_free_tfm(conn->tx_tfm); + if (!tcp_conn->rx_tfm) + tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c", + 0); + if (!tcp_conn->rx_tfm) { + crypto_free_tfm(tcp_conn->tx_tfm); return -ENOMEM; } } else { - if (conn->tx_tfm) - crypto_free_tfm(conn->tx_tfm); - if (conn->rx_tfm) - crypto_free_tfm(conn->rx_tfm); + if (tcp_conn->tx_tfm) + crypto_free_tfm(tcp_conn->tx_tfm); + if (tcp_conn->rx_tfm) + crypto_free_tfm(tcp_conn->rx_tfm); } break; case ISCSI_PARAM_DATADGST_EN: conn->datadgst_en = value; if (conn->datadgst_en) { - if (!conn->data_tx_tfm) - conn->data_tx_tfm = + if (!tcp_conn->data_tx_tfm) + tcp_conn->data_tx_tfm = crypto_alloc_tfm("crc32c", 0); - if (!conn->data_tx_tfm) + if (!tcp_conn->data_tx_tfm) return -ENOMEM; - if (!conn->data_rx_tfm) - conn->data_rx_tfm = + if (!tcp_conn->data_rx_tfm) + tcp_conn->data_rx_tfm = crypto_alloc_tfm("crc32c", 0); - if (!conn->data_rx_tfm) { - crypto_free_tfm(conn->data_tx_tfm); + if (!tcp_conn->data_rx_tfm) { + crypto_free_tfm(tcp_conn->data_tx_tfm); return -ENOMEM; } } else { - if (conn->data_tx_tfm) - crypto_free_tfm(conn->data_tx_tfm); - if (conn->data_rx_tfm) - crypto_free_tfm(conn->data_rx_tfm); + if (tcp_conn->data_tx_tfm) + crypto_free_tfm(tcp_conn->data_tx_tfm); + if (tcp_conn->data_rx_tfm) + crypto_free_tfm(tcp_conn->data_rx_tfm); } - conn->sendpage = conn->datadgst_en ? - sock_no_sendpage : conn->sock->ops->sendpage; + tcp_conn->sendpage = conn->datadgst_en ? + sock_no_sendpage : tcp_conn->sock->ops->sendpage; break; case ISCSI_PARAM_INITIAL_R2T_EN: session->initial_r2t_en = value; @@ -3535,7 +2344,7 @@ iscsi_session_get_param(struct iscsi_cls_session *cls_session, *value = session->ofmarker_en; break; default: - return ISCSI_ERR_PARAM_NOT_FOUND; + return -EINVAL; } return 0; @@ -3546,6 +2355,8 @@ iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, uint32_t *value) { struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct inet_sock *inet; switch(param) { case ISCSI_PARAM_MAX_RECV_DLENGTH: @@ -3560,17 +2371,67 @@ iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, case ISCSI_PARAM_DATADGST_EN: *value = conn->datadgst_en; break; + case ISCSI_PARAM_CONN_PORT: + mutex_lock(&conn->xmitmutex); + if (!tcp_conn->sock) { + mutex_unlock(&conn->xmitmutex); + return -EINVAL; + } + + inet = inet_sk(tcp_conn->sock->sk); + *value = be16_to_cpu(inet->dport); + mutex_unlock(&conn->xmitmutex); default: - return ISCSI_ERR_PARAM_NOT_FOUND; + return -EINVAL; } return 0; } +static int +iscsi_conn_get_str_param(struct iscsi_cls_conn *cls_conn, + enum iscsi_param param, char *buf) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct sock *sk; + struct inet_sock *inet; + struct ipv6_pinfo *np; + int len = 0; + + switch (param) { + case ISCSI_PARAM_CONN_ADDRESS: + mutex_lock(&conn->xmitmutex); + if (!tcp_conn->sock) { + mutex_unlock(&conn->xmitmutex); + return -EINVAL; + } + + sk = tcp_conn->sock->sk; + if (sk->sk_family == PF_INET) { + inet = inet_sk(sk); + len = sprintf(buf, "%u.%u.%u.%u\n", + NIPQUAD(inet->daddr)); + } else { + np = inet6_sk(sk); + len = sprintf(buf, + "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", + NIP6(np->daddr)); + } + mutex_unlock(&conn->xmitmutex); + break; + default: + return -EINVAL; + } + + return len; +} + static void iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) { struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; stats->txdata_octets = conn->txdata_octets; stats->rxdata_octets = conn->rxdata_octets; @@ -3583,49 +2444,141 @@ iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; stats->custom_length = 3; strcpy(stats->custom[0].desc, "tx_sendpage_failures"); - stats->custom[0].value = conn->sendpage_failures_cnt; + stats->custom[0].value = tcp_conn->sendpage_failures_cnt; strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); - stats->custom[1].value = conn->discontiguous_hdr_cnt; + stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; strcpy(stats->custom[2].desc, "eh_abort_cnt"); stats->custom[2].value = conn->eh_abort_cnt; } -static int -iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, - char *data, uint32_t data_size) +static struct iscsi_cls_session * +iscsi_tcp_session_create(struct iscsi_transport *iscsit, + struct scsi_transport_template *scsit, + uint32_t initial_cmdsn, uint32_t *hostno) { - struct iscsi_conn *conn = cls_conn->dd_data; - int rc; + struct iscsi_cls_session *cls_session; + struct iscsi_session *session; + uint32_t hn; + int cmd_i; - mutex_lock(&conn->xmitmutex); - rc = iscsi_conn_send_generic(conn, hdr, data, data_size); - mutex_unlock(&conn->xmitmutex); + cls_session = iscsi_session_setup(iscsit, scsit, + sizeof(struct iscsi_tcp_cmd_task), + sizeof(struct iscsi_tcp_mgmt_task), + initial_cmdsn, &hn); + if (!cls_session) + return NULL; + *hostno = hn; - return rc; + session = class_to_transport_session(cls_session); + for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { + struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + ctask->hdr = &tcp_ctask->hdr; + } + + for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { + struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; + struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; + + mtask->hdr = &tcp_mtask->hdr; + } + + if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) + goto r2tpool_alloc_fail; + + return cls_session; + +r2tpool_alloc_fail: + iscsi_session_teardown(cls_session); + return NULL; } +static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) +{ + struct iscsi_session *session = class_to_transport_session(cls_session); + struct iscsi_data_task *dtask, *n; + int cmd_i; + + for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { + struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + list_for_each_entry_safe(dtask, n, &tcp_ctask->dataqueue, + item) { + list_del(&dtask->item); + mempool_free(dtask, tcp_ctask->datapool); + } + } + + iscsi_r2tpool_free(class_to_transport_session(cls_session)); + iscsi_session_teardown(cls_session); +} + +static struct scsi_host_template iscsi_sht = { + .name = "iSCSI Initiator over TCP/IP, v." + ISCSI_VERSION_STR, + .queuecommand = iscsi_queuecommand, + .change_queue_depth = iscsi_change_queue_depth, + .can_queue = ISCSI_XMIT_CMDS_MAX - 1, + .sg_tablesize = ISCSI_SG_TABLESIZE, + .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, + .eh_abort_handler = iscsi_eh_abort, + .eh_host_reset_handler = iscsi_eh_host_reset, + .use_clustering = DISABLE_CLUSTERING, + .proc_name = "iscsi_tcp", + .this_id = -1, +}; + static struct iscsi_transport iscsi_tcp_transport = { .owner = THIS_MODULE, .name = "tcp", .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | CAP_DATADGST, + .param_mask = ISCSI_MAX_RECV_DLENGTH | + ISCSI_MAX_XMIT_DLENGTH | + ISCSI_HDRDGST_EN | + ISCSI_DATADGST_EN | + ISCSI_INITIAL_R2T_EN | + ISCSI_MAX_R2T | + ISCSI_IMM_DATA_EN | + ISCSI_FIRST_BURST | + ISCSI_MAX_BURST | + ISCSI_PDU_INORDER_EN | + ISCSI_DATASEQ_INORDER_EN | + ISCSI_ERL | + ISCSI_CONN_PORT | + ISCSI_CONN_ADDRESS, .host_template = &iscsi_sht, - .hostdata_size = sizeof(struct iscsi_session), .conndata_size = sizeof(struct iscsi_conn), .max_conn = 1, .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, - .create_session = iscsi_session_create, - .destroy_session = iscsi_session_destroy, - .create_conn = iscsi_conn_create, - .bind_conn = iscsi_conn_bind, - .destroy_conn = iscsi_conn_destroy, + /* session management */ + .create_session = iscsi_tcp_session_create, + .destroy_session = iscsi_tcp_session_destroy, + /* connection management */ + .create_conn = iscsi_tcp_conn_create, + .bind_conn = iscsi_tcp_conn_bind, + .destroy_conn = iscsi_tcp_conn_destroy, .set_param = iscsi_conn_set_param, .get_conn_param = iscsi_conn_get_param, + .get_conn_str_param = iscsi_conn_get_str_param, .get_session_param = iscsi_session_get_param, .start_conn = iscsi_conn_start, .stop_conn = iscsi_conn_stop, + /* these are called as part of conn recovery */ + .suspend_conn_recv = iscsi_tcp_suspend_conn_rx, + .terminate_conn = iscsi_tcp_terminate_conn, + /* IO */ .send_pdu = iscsi_conn_send_pdu, .get_stats = iscsi_conn_get_stats, + .init_cmd_task = iscsi_tcp_cmd_init, + .init_mgmt_task = iscsi_tcp_mgmt_init, + .xmit_cmd_task = iscsi_tcp_ctask_xmit, + .xmit_mgmt_task = iscsi_tcp_mtask_xmit, + .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, + /* recovery */ + .session_recovery_timedout = iscsi_session_recovery_timedout, }; static int __init diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h index ba26741ac15..c5918854d59 100644 --- a/drivers/scsi/iscsi_tcp.h +++ b/drivers/scsi/iscsi_tcp.h @@ -2,7 +2,8 @@ * iSCSI Initiator TCP Transport * Copyright (C) 2004 Dmitry Yusupov * Copyright (C) 2004 Alex Aizman - * Copyright (C) 2005 Mike Christie + * Copyright (C) 2005 - 2006 Mike Christie + * Copyright (C) 2006 Red Hat, Inc. All rights reserved. * maintained by open-iscsi@googlegroups.com * * This program is free software; you can redistribute it and/or modify @@ -21,20 +22,7 @@ #ifndef ISCSI_TCP_H #define ISCSI_TCP_H -/* Session's states */ -#define ISCSI_STATE_FREE 1 -#define ISCSI_STATE_LOGGED_IN 2 -#define ISCSI_STATE_FAILED 3 -#define ISCSI_STATE_TERMINATE 4 - -/* Connection's states */ -#define ISCSI_CONN_INITIAL_STAGE 0 -#define ISCSI_CONN_STARTED 1 -#define ISCSI_CONN_STOPPED 2 -#define ISCSI_CONN_CLEANUP_WAIT 3 - -/* Connection suspend "bit" */ -#define SUSPEND_BIT 1 +#include <scsi/libiscsi.h> /* Socket's Receive state machine */ #define IN_PROGRESS_WAIT_HEADER 0x0 @@ -42,12 +30,6 @@ #define IN_PROGRESS_DATA_RECV 0x2 #define IN_PROGRESS_DDIGEST_RECV 0x3 -/* Task Mgmt states */ -#define TMABORT_INITIAL 0x0 -#define TMABORT_SUCCESS 0x1 -#define TMABORT_FAILED 0x2 -#define TMABORT_TIMEDOUT 0x3 - /* xmit state machine */ #define XMSTATE_IDLE 0x0 #define XMSTATE_R_HDR 0x1 @@ -62,34 +44,14 @@ #define XMSTATE_W_PAD 0x200 #define XMSTATE_DATA_DIGEST 0x400 -#define ISCSI_CONN_MAX 1 #define ISCSI_CONN_RCVBUF_MIN 262144 #define ISCSI_CONN_SNDBUF_MIN 262144 #define ISCSI_PAD_LEN 4 #define ISCSI_R2T_MAX 16 -#define ISCSI_XMIT_CMDS_MAX 128 /* must be power of 2 */ -#define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */ -#define ISCSI_MGMT_ITT_OFFSET 0xa00 #define ISCSI_SG_TABLESIZE SG_ALL -#define ISCSI_DEF_CMD_PER_LUN 32 -#define ISCSI_MAX_CMD_PER_LUN 128 #define ISCSI_TCP_MAX_CMD_LEN 16 -#define ITT_MASK (0xfff) -#define CID_SHIFT 12 -#define CID_MASK (0xffff<<CID_SHIFT) -#define AGE_SHIFT 28 -#define AGE_MASK (0xf<<AGE_SHIFT) - -struct iscsi_queue { - struct kfifo *queue; /* FIFO Queue */ - void **pool; /* Pool of elements */ - int max; /* Max number of elements */ -}; - -struct iscsi_session; -struct iscsi_cmd_task; -struct iscsi_mgmt_task; +struct socket; /* Socket connection recieve helper */ struct iscsi_tcp_recv { @@ -104,48 +66,32 @@ struct iscsi_tcp_recv { struct iscsi_cmd_task *ctask; /* current cmd in progress */ /* copied and flipped values */ - int opcode; - int flags; - int cmd_status; - int ahslen; int datalen; - uint32_t itt; int datadgst; + char zero_copy_hdr; }; -struct iscsi_cls_conn; - -struct iscsi_conn { - struct iscsi_cls_conn *cls_conn; /* ptr to class connection */ +struct iscsi_tcp_conn { + struct iscsi_conn *iscsi_conn; + struct socket *sock; struct iscsi_hdr hdr; /* header placeholder */ char hdrext[4*sizeof(__u16) + sizeof(__u32)]; int data_copied; char *data; /* data placeholder */ - struct socket *sock; /* TCP socket */ int data_size; /* actual recv_dlength */ int stop_stage; /* conn_stop() flag: * * stop to recover, * * stop to terminate */ /* iSCSI connection-wide sequencing */ - uint32_t exp_statsn; int hdr_size; /* PDU header size */ - unsigned long suspend_rx; /* suspend Rx */ struct crypto_tfm *rx_tfm; /* CRC32C (Rx) */ struct crypto_tfm *data_rx_tfm; /* CRC32C (Rx) for data */ /* control data */ - int senselen; /* scsi sense length */ - int id; /* CID */ struct iscsi_tcp_recv in; /* TCP receive context */ - struct iscsi_session *session; /* parent session */ - struct list_head item; /* maintains list of conns */ int in_progress; /* connection state machine */ - int c_stage; /* connection state */ - struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */ - struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */ - struct iscsi_cmd_task *ctask; /* xmit ctask in progress */ /* old values for socket callbacks */ void (*old_data_ready)(struct sock *, int); @@ -155,93 +101,14 @@ struct iscsi_conn { /* xmit */ struct crypto_tfm *tx_tfm; /* CRC32C (Tx) */ struct crypto_tfm *data_tx_tfm; /* CRC32C (Tx) for data */ - struct kfifo *writequeue; /* write cmds for Data-Outs */ - struct kfifo *immqueue; /* immediate xmit queue */ - struct kfifo *mgmtqueue; /* mgmt (control) xmit queue */ - struct kfifo *xmitqueue; /* data-path cmd queue */ - struct work_struct xmitwork; /* per-conn. xmit workqueue */ - struct mutex xmitmutex; /* serializes connection xmit, - * access to kfifos: * - * xmitqueue, writequeue, * - * immqueue, mgmtqueue */ - unsigned long suspend_tx; /* suspend Tx */ - - /* abort */ - wait_queue_head_t ehwait; /* used in eh_abort() */ - struct iscsi_tm tmhdr; - struct timer_list tmabort_timer; /* abort timer */ - int tmabort_state; /* see TMABORT_INITIAL, etc.*/ - - /* negotiated params */ - int max_recv_dlength; - int max_xmit_dlength; - int hdrdgst_en; - int datadgst_en; - /* MIB-statistics */ - uint64_t txdata_octets; - uint64_t rxdata_octets; - uint32_t scsicmd_pdus_cnt; - uint32_t dataout_pdus_cnt; - uint32_t scsirsp_pdus_cnt; - uint32_t datain_pdus_cnt; - uint32_t r2t_pdus_cnt; - uint32_t tmfcmd_pdus_cnt; - int32_t tmfrsp_pdus_cnt; - - /* custom statistics */ + /* MIB custom statistics */ uint32_t sendpage_failures_cnt; uint32_t discontiguous_hdr_cnt; - uint32_t eh_abort_cnt; ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int); }; -struct iscsi_session { - /* iSCSI session-wide sequencing */ - uint32_t cmdsn; - uint32_t exp_cmdsn; - uint32_t max_cmdsn; - - /* configuration */ - int initial_r2t_en; - int max_r2t; - int imm_data_en; - int first_burst; - int max_burst; - int time2wait; - int time2retain; - int pdu_inorder_en; - int dataseq_inorder_en; - int erl; - int ifmarker_en; - int ofmarker_en; - - /* control data */ - struct Scsi_Host *host; - int id; - struct iscsi_conn *leadconn; /* leading connection */ - spinlock_t lock; /* protects session state, * - * sequence numbers, * - * session resources: * - * - cmdpool, * - * - mgmtpool, * - * - r2tpool */ - int state; /* session state */ - struct list_head item; - void *auth_client; - int conn_cnt; - int age; /* counts session re-opens */ - - struct list_head connections; /* list of connections */ - int cmds_max; /* size of cmds array */ - struct iscsi_cmd_task **cmds; /* Original Cmds arr */ - struct iscsi_queue cmdpool; /* PDU's pool */ - int mgmtpool_max; /* size of mgmt array */ - struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */ - struct iscsi_queue mgmtpool; /* Mgmt PDU's pool */ -}; - struct iscsi_buf { struct scatterlist sg; unsigned int sent; @@ -257,16 +124,13 @@ struct iscsi_data_task { }; #define ISCSI_DTASK_DEFAULT_MAX ISCSI_SG_TABLESIZE * PAGE_SIZE / 512 -struct iscsi_mgmt_task { - struct iscsi_hdr hdr; /* mgmt. PDU */ - char hdrext[sizeof(__u32)]; /* Header-Digest */ - char *data; /* mgmt payload */ +struct iscsi_tcp_mgmt_task { + struct iscsi_hdr hdr; + char hdrext[sizeof(__u32)]; /* Header-Digest */ int xmstate; /* mgmt xmit progress */ - int data_count; /* counts data to be sent */ struct iscsi_buf headbuf; /* header buffer */ struct iscsi_buf sendbuf; /* in progress buffer */ int sent; - uint32_t itt; /* this ITT */ }; struct iscsi_r2t_info { @@ -283,33 +147,22 @@ struct iscsi_r2t_info { struct iscsi_data_task *dtask; /* which data task */ }; -struct iscsi_cmd_task { - struct iscsi_cmd hdr; /* iSCSI PDU header */ +struct iscsi_tcp_cmd_task { + struct iscsi_cmd hdr; char hdrext[4*sizeof(__u16)+ /* AHS */ sizeof(__u32)]; /* HeaderDigest */ char pad[ISCSI_PAD_LEN]; - int itt; /* this ITT */ - int datasn; /* DataSN */ + int pad_count; /* padded bytes */ struct iscsi_buf headbuf; /* header buf (xmit) */ struct iscsi_buf sendbuf; /* in progress buffer*/ + int xmstate; /* xmit xtate machine */ int sent; struct scatterlist *sg; /* per-cmd SG list */ struct scatterlist *bad_sg; /* assert statement */ int sg_count; /* SG's to process */ - uint32_t unsol_datasn; uint32_t exp_r2tsn; - int xmstate; /* xmit xtate machine */ - int imm_count; /* imm-data (bytes) */ - int unsol_count; /* unsolicited (bytes)*/ int r2t_data_count; /* R2T Data-Out bytes */ - int data_count; /* remaining Data-Out */ - int pad_count; /* padded bytes */ - struct scsi_cmnd *sc; /* associated SCSI cmd*/ - int total_length; int data_offset; - struct iscsi_conn *conn; /* used connection */ - struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */ - struct iscsi_r2t_info *r2t; /* in progress R2T */ struct iscsi_queue r2tpool; struct kfifo *r2tqueue; diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c new file mode 100644 index 00000000000..274a1374ab6 --- /dev/null +++ b/drivers/scsi/libiscsi.c @@ -0,0 +1,1697 @@ +/* + * iSCSI lib functions + * + * Copyright (C) 2006 Red Hat, Inc. All rights reserved. + * Copyright (C) 2004 - 2006 Mike Christie + * Copyright (C) 2004 - 2005 Dmitry Yusupov + * Copyright (C) 2004 - 2005 Alex Aizman + * maintained by open-iscsi@googlegroups.com + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ +#include <linux/types.h> +#include <linux/mutex.h> +#include <linux/kfifo.h> +#include <linux/delay.h> +#include <net/tcp.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi.h> +#include <scsi/iscsi_proto.h> +#include <scsi/scsi_transport.h> +#include <scsi/scsi_transport_iscsi.h> +#include <scsi/libiscsi.h> + +struct iscsi_session * +class_to_transport_session(struct iscsi_cls_session *cls_session) +{ + struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); + return iscsi_hostdata(shost->hostdata); +} +EXPORT_SYMBOL_GPL(class_to_transport_session); + +#define INVALID_SN_DELTA 0xffff + +int +iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) +{ + uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); + uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); + + if (max_cmdsn < exp_cmdsn -1 && + max_cmdsn > exp_cmdsn - INVALID_SN_DELTA) + return ISCSI_ERR_MAX_CMDSN; + if (max_cmdsn > session->max_cmdsn || + max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA) + session->max_cmdsn = max_cmdsn; + if (exp_cmdsn > session->exp_cmdsn || + exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA) + session->exp_cmdsn = exp_cmdsn; + + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn); + +void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, + struct iscsi_data *hdr, + int transport_data_cnt) +{ + struct iscsi_conn *conn = ctask->conn; + + memset(hdr, 0, sizeof(struct iscsi_data)); + hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); + hdr->datasn = cpu_to_be32(ctask->unsol_datasn); + ctask->unsol_datasn++; + hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; + memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); + + hdr->itt = ctask->hdr->itt; + hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); + + hdr->offset = cpu_to_be32(ctask->total_length - + transport_data_cnt - + ctask->unsol_count); + + if (ctask->unsol_count > conn->max_xmit_dlength) { + hton24(hdr->dlength, conn->max_xmit_dlength); + ctask->data_count = conn->max_xmit_dlength; + hdr->flags = 0; + } else { + hton24(hdr->dlength, ctask->unsol_count); + ctask->data_count = ctask->unsol_count; + hdr->flags = ISCSI_FLAG_CMD_FINAL; + } +} +EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); + +/** + * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu + * @ctask: iscsi cmd task + * + * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set + * fields like dlength or final based on how much data it sends + */ +static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) +{ + struct iscsi_conn *conn = ctask->conn; + struct iscsi_session *session = conn->session; + struct iscsi_cmd *hdr = ctask->hdr; + struct scsi_cmnd *sc = ctask->sc; + + hdr->opcode = ISCSI_OP_SCSI_CMD; + hdr->flags = ISCSI_ATTR_SIMPLE; + int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); + hdr->itt = ctask->itt | (conn->id << ISCSI_CID_SHIFT) | + (session->age << ISCSI_AGE_SHIFT); + hdr->data_length = cpu_to_be32(sc->request_bufflen); + hdr->cmdsn = cpu_to_be32(session->cmdsn); + session->cmdsn++; + hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); + memcpy(hdr->cdb, sc->cmnd, sc->cmd_len); + memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len); + + if (sc->sc_data_direction == DMA_TO_DEVICE) { + hdr->flags |= ISCSI_FLAG_CMD_WRITE; + /* + * Write counters: + * + * imm_count bytes to be sent right after + * SCSI PDU Header + * + * unsol_count bytes(as Data-Out) to be sent + * without R2T ack right after + * immediate data + * + * r2t_data_count bytes to be sent via R2T ack's + * + * pad_count bytes to be sent as zero-padding + */ + ctask->imm_count = 0; + ctask->unsol_count = 0; + ctask->unsol_datasn = 0; + + if (session->imm_data_en) { + if (ctask->total_length >= session->first_burst) + ctask->imm_count = min(session->first_burst, + conn->max_xmit_dlength); + else + ctask->imm_count = min(ctask->total_length, + conn->max_xmit_dlength); + hton24(ctask->hdr->dlength, ctask->imm_count); + } else + zero_data(ctask->hdr->dlength); + + if (!session->initial_r2t_en) + ctask->unsol_count = min(session->first_burst, + ctask->total_length) - ctask->imm_count; + if (!ctask->unsol_count) + /* No unsolicit Data-Out's */ + ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL; + } else { + ctask->datasn = 0; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + zero_data(hdr->dlength); + + if (sc->sc_data_direction == DMA_FROM_DEVICE) + hdr->flags |= ISCSI_FLAG_CMD_READ; + } + + conn->scsicmd_pdus_cnt++; +} +EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu); + +/** + * iscsi_complete_command - return command back to scsi-ml + * @session: iscsi session + * @ctask: iscsi cmd task + * + * Must be called with session lock. + * This function returns the scsi command to scsi-ml and returns + * the cmd task to the pool of available cmd tasks. + */ +static void iscsi_complete_command(struct iscsi_session *session, + struct iscsi_cmd_task *ctask) +{ + struct scsi_cmnd *sc = ctask->sc; + + ctask->sc = NULL; + list_del_init(&ctask->running); + __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); + sc->scsi_done(sc); +} + +/** + * iscsi_cmd_rsp - SCSI Command Response processing + * @conn: iscsi connection + * @hdr: iscsi header + * @ctask: scsi command task + * @data: cmd data buffer + * @datalen: len of buffer + * + * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and + * then completes the command and task. + **/ +static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + struct iscsi_cmd_task *ctask, char *data, + int datalen) +{ + int rc; + struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; + struct iscsi_session *session = conn->session; + struct scsi_cmnd *sc = ctask->sc; + + rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); + if (rc) { + sc->result = DID_ERROR << 16; + goto out; + } + + conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; + + sc->result = (DID_OK << 16) | rhdr->cmd_status; + + if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { + sc->result = DID_ERROR << 16; + goto out; + } + + if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { + int senselen; + + if (datalen < 2) { +invalid_datalen: + printk(KERN_ERR "Got CHECK_CONDITION but invalid " + "data buffer size of %d\n", datalen); + sc->result = DID_BAD_TARGET << 16; + goto out; + } + + senselen = (data[0] << 8) | data[1]; + if (datalen < senselen) + goto invalid_datalen; + + memcpy(sc->sense_buffer, data + 2, + min(senselen, SCSI_SENSE_BUFFERSIZE)); + debug_scsi("copied %d bytes of sense\n", + min(senselen, SCSI_SENSE_BUFFERSIZE)); + } + + if (sc->sc_data_direction == DMA_TO_DEVICE) + goto out; + + if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { + int res_count = be32_to_cpu(rhdr->residual_count); + + if (res_count > 0 && res_count <= sc->request_bufflen) + sc->resid = res_count; + else + sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; + } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) + sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; + else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) + sc->resid = be32_to_cpu(rhdr->residual_count); + +out: + debug_scsi("done [sc %lx res %d itt 0x%x]\n", + (long)sc, sc->result, ctask->itt); + conn->scsirsp_pdus_cnt++; + + iscsi_complete_command(conn->session, ctask); + return rc; +} + +/** + * __iscsi_complete_pdu - complete pdu + * @conn: iscsi conn + * @hdr: iscsi header + * @data: data buffer + * @datalen: len of data buffer + * + * Completes pdu processing by freeing any resources allocated at + * queuecommand or send generic. session lock must be held and verify + * itt must have been called. + */ +int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + char *data, int datalen) +{ + struct iscsi_session *session = conn->session; + int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; + struct iscsi_cmd_task *ctask; + struct iscsi_mgmt_task *mtask; + uint32_t itt; + + if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) + itt = hdr->itt & ISCSI_ITT_MASK; + else + itt = hdr->itt; + + if (itt < session->cmds_max) { + ctask = session->cmds[itt]; + + debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", + opcode, conn->id, ctask->itt, datalen); + + switch(opcode) { + case ISCSI_OP_SCSI_CMD_RSP: + BUG_ON((void*)ctask != ctask->sc->SCp.ptr); + rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, + datalen); + break; + case ISCSI_OP_SCSI_DATA_IN: + BUG_ON((void*)ctask != ctask->sc->SCp.ptr); + if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { + conn->scsirsp_pdus_cnt++; + iscsi_complete_command(session, ctask); + } + break; + case ISCSI_OP_R2T: + /* LLD handles this for now */ + break; + default: + rc = ISCSI_ERR_BAD_OPCODE; + break; + } + } else if (itt >= ISCSI_MGMT_ITT_OFFSET && + itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { + mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; + + debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", + opcode, conn->id, mtask->itt, datalen); + + switch(opcode) { + case ISCSI_OP_LOGIN_RSP: + case ISCSI_OP_TEXT_RSP: + case ISCSI_OP_LOGOUT_RSP: + rc = iscsi_check_assign_cmdsn(session, + (struct iscsi_nopin*)hdr); + if (rc) + break; + + rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen); + list_del(&mtask->running); + if (conn->login_mtask != mtask) + __kfifo_put(session->mgmtpool.queue, + (void*)&mtask, sizeof(void*)); + break; + case ISCSI_OP_SCSI_TMFUNC_RSP: + rc = iscsi_check_assign_cmdsn(session, + (struct iscsi_nopin*)hdr); + if (rc) + break; + + if (datalen) { + rc = ISCSI_ERR_PROTO; + break; + } + conn->tmfrsp_pdus_cnt++; + if (conn->tmabort_state == TMABORT_INITIAL) { + conn->tmabort_state = + ((struct iscsi_tm_rsp *)hdr)-> + response == ISCSI_TMF_RSP_COMPLETE ? + TMABORT_SUCCESS:TMABORT_FAILED; + /* unblock eh_abort() */ + wake_up(&conn->ehwait); + } + break; + case ISCSI_OP_NOOP_IN: + if (hdr->ttt != ISCSI_RESERVED_TAG) { + rc = ISCSI_ERR_PROTO; + break; + } + rc = iscsi_check_assign_cmdsn(session, + (struct iscsi_nopin*)hdr); + if (rc) + break; + conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; + + rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen); + list_del(&mtask->running); + if (conn->login_mtask != mtask) + __kfifo_put(session->mgmtpool.queue, + (void*)&mtask, sizeof(void*)); + break; + default: + rc = ISCSI_ERR_BAD_OPCODE; + break; + } + } else if (itt == ISCSI_RESERVED_TAG) { + switch(opcode) { + case ISCSI_OP_NOOP_IN: + if (!datalen) { + rc = iscsi_check_assign_cmdsn(session, + (struct iscsi_nopin*)hdr); + if (!rc && hdr->ttt != ISCSI_RESERVED_TAG) + rc = iscsi_recv_pdu(conn->cls_conn, + hdr, NULL, 0); + } else + rc = ISCSI_ERR_PROTO; + break; + case ISCSI_OP_REJECT: + /* we need sth like iscsi_reject_rsp()*/ + case ISCSI_OP_ASYNC_EVENT: + /* we need sth like iscsi_async_event_rsp() */ + rc = ISCSI_ERR_BAD_OPCODE; + break; + default: + rc = ISCSI_ERR_BAD_OPCODE; + break; + } + } else + rc = ISCSI_ERR_BAD_ITT; + + return rc; +} +EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); + +int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + char *data, int datalen) +{ + int rc; + + spin_lock(&conn->session->lock); + rc = __iscsi_complete_pdu(conn, hdr, data, datalen); + spin_unlock(&conn->session->lock); + return rc; +} +EXPORT_SYMBOL_GPL(iscsi_complete_pdu); + +/* verify itt (itt encoding: age+cid+itt) */ +int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + uint32_t *ret_itt) +{ + struct iscsi_session *session = conn->session; + struct iscsi_cmd_task *ctask; + uint32_t itt; + + if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { + if ((hdr->itt & ISCSI_AGE_MASK) != + (session->age << ISCSI_AGE_SHIFT)) { + printk(KERN_ERR "iscsi_tcp: received itt %x expected " + "session age (%x)\n", hdr->itt, + session->age & ISCSI_AGE_MASK); + return ISCSI_ERR_BAD_ITT; + } + + if ((hdr->itt & ISCSI_CID_MASK) != + (conn->id << ISCSI_CID_SHIFT)) { + printk(KERN_ERR "iscsi_tcp: received itt %x, expected " + "CID (%x)\n", hdr->itt, conn->id); + return ISCSI_ERR_BAD_ITT; + } + itt = hdr->itt & ISCSI_ITT_MASK; + } else + itt = hdr->itt; + + if (itt < session->cmds_max) { + ctask = session->cmds[itt]; + + if (!ctask->sc) { + printk(KERN_INFO "iscsi_tcp: dropping ctask with " + "itt 0x%x\n", ctask->itt); + /* force drop */ + return ISCSI_ERR_NO_SCSI_CMD; + } + + if (ctask->sc->SCp.phase != session->age) { + printk(KERN_ERR "iscsi_tcp: ctask's session age %d, " + "expected %d\n", ctask->sc->SCp.phase, + session->age); + return ISCSI_ERR_SESSION_FAILED; + } + } + + *ret_itt = itt; + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_verify_itt); + +void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) +{ + struct iscsi_session *session = conn->session; + unsigned long flags; + + spin_lock_irqsave(&session->lock, flags); + if (session->conn_cnt == 1 || session->leadconn == conn) + session->state = ISCSI_STATE_FAILED; + spin_unlock_irqrestore(&session->lock, flags); + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); + iscsi_conn_error(conn->cls_conn, err); +} +EXPORT_SYMBOL_GPL(iscsi_conn_failure); + +/** + * iscsi_data_xmit - xmit any command into the scheduled connection + * @conn: iscsi connection + * + * Notes: + * The function can return -EAGAIN in which case the caller must + * re-schedule it again later or recover. '0' return code means + * successful xmit. + **/ +static int iscsi_data_xmit(struct iscsi_conn *conn) +{ + struct iscsi_transport *tt; + + if (unlikely(conn->suspend_tx)) { + debug_scsi("conn %d Tx suspended!\n", conn->id); + return 0; + } + tt = conn->session->tt; + + /* + * Transmit in the following order: + * + * 1) un-finished xmit (ctask or mtask) + * 2) immediate control PDUs + * 3) write data + * 4) SCSI commands + * 5) non-immediate control PDUs + * + * No need to lock around __kfifo_get as long as + * there's one producer and one consumer. + */ + + BUG_ON(conn->ctask && conn->mtask); + + if (conn->ctask) { + if (tt->xmit_cmd_task(conn, conn->ctask)) + goto again; + /* done with this in-progress ctask */ + conn->ctask = NULL; + } + if (conn->mtask) { + if (tt->xmit_mgmt_task(conn, conn->mtask)) + goto again; + /* done with this in-progress mtask */ + conn->mtask = NULL; + } + + /* process immediate first */ + if (unlikely(__kfifo_len(conn->immqueue))) { + while (__kfifo_get(conn->immqueue, (void*)&conn->mtask, + sizeof(void*))) { + list_add_tail(&conn->mtask->running, + &conn->mgmt_run_list); + if (tt->xmit_mgmt_task(conn, conn->mtask)) + goto again; + } + /* done with this mtask */ + conn->mtask = NULL; + } + + /* process command queue */ + while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask, + sizeof(void*))) { + /* + * iscsi tcp may readd the task to the xmitqueue to send + * write data + */ + if (list_empty(&conn->ctask->running)) + list_add_tail(&conn->ctask->running, &conn->run_list); + if (tt->xmit_cmd_task(conn, conn->ctask)) + goto again; + } + /* done with this ctask */ + conn->ctask = NULL; + + /* process the rest control plane PDUs, if any */ + if (unlikely(__kfifo_len(conn->mgmtqueue))) { + while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, + sizeof(void*))) { + list_add_tail(&conn->mtask->running, + &conn->mgmt_run_list); + if (tt->xmit_mgmt_task(conn, conn->mtask)) + goto again; + } + /* done with this mtask */ + conn->mtask = NULL; + } + + return 0; + +again: + if (unlikely(conn->suspend_tx)) + return 0; + + return -EAGAIN; +} + +static void iscsi_xmitworker(void *data) +{ + struct iscsi_conn *conn = data; + + /* + * serialize Xmit worker on a per-connection basis. + */ + mutex_lock(&conn->xmitmutex); + if (iscsi_data_xmit(conn)) + scsi_queue_work(conn->session->host, &conn->xmitwork); + mutex_unlock(&conn->xmitmutex); +} + +enum { + FAILURE_BAD_HOST = 1, + FAILURE_SESSION_FAILED, + FAILURE_SESSION_FREED, + FAILURE_WINDOW_CLOSED, + FAILURE_SESSION_TERMINATE, + FAILURE_SESSION_RECOVERY_TIMEOUT, +}; + +int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) +{ + struct Scsi_Host *host; + int reason = 0; + struct iscsi_session *session; + struct iscsi_conn *conn; + struct iscsi_cmd_task *ctask = NULL; + + sc->scsi_done = done; + sc->result = 0; + + host = sc->device->host; + session = iscsi_hostdata(host->hostdata); + + spin_lock(&session->lock); + + if (session->state != ISCSI_STATE_LOGGED_IN) { + if (session->recovery_failed) { + reason = FAILURE_SESSION_RECOVERY_TIMEOUT; + goto fault; + } else if (session->state == ISCSI_STATE_FAILED) { + reason = FAILURE_SESSION_FAILED; + goto reject; + } else if (session->state == ISCSI_STATE_TERMINATE) { + reason = FAILURE_SESSION_TERMINATE; + goto fault; + } + reason = FAILURE_SESSION_FREED; + goto fault; + } + + /* + * Check for iSCSI window and take care of CmdSN wrap-around + */ + if ((int)(session->max_cmdsn - session->cmdsn) < 0) { + reason = FAILURE_WINDOW_CLOSED; + goto reject; + } + + conn = session->leadconn; + + __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); + sc->SCp.phase = session->age; + sc->SCp.ptr = (char *)ctask; + + ctask->mtask = NULL; + ctask->conn = conn; + ctask->sc = sc; + INIT_LIST_HEAD(&ctask->running); + ctask->total_length = sc->request_bufflen; + iscsi_prep_scsi_cmd_pdu(ctask); + + session->tt->init_cmd_task(ctask); + + __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*)); + debug_scsi( + "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n", + sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", + conn->id, (long)sc, ctask->itt, sc->request_bufflen, + session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); + spin_unlock(&session->lock); + + scsi_queue_work(host, &conn->xmitwork); + return 0; + +reject: + spin_unlock(&session->lock); + debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); + return SCSI_MLQUEUE_HOST_BUSY; + +fault: + spin_unlock(&session->lock); + printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n", + sc->cmnd[0], reason); + sc->result = (DID_NO_CONNECT << 16); + sc->resid = sc->request_bufflen; + sc->scsi_done(sc); + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_queuecommand); + +int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) +{ + if (depth > ISCSI_MAX_CMD_PER_LUN) + depth = ISCSI_MAX_CMD_PER_LUN; + scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); + return sdev->queue_depth; +} +EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); + +static int +iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + char *data, uint32_t data_size) +{ + struct iscsi_session *session = conn->session; + struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; + struct iscsi_mgmt_task *mtask; + + spin_lock_bh(&session->lock); + if (session->state == ISCSI_STATE_TERMINATE) { + spin_unlock_bh(&session->lock); + return -EPERM; + } + if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || + hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) + /* + * Login and Text are sent serially, in + * request-followed-by-response sequence. + * Same mtask can be used. Same ITT must be used. + * Note that login_mtask is preallocated at conn_create(). + */ + mtask = conn->login_mtask; + else { + BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); + BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); + + if (!__kfifo_get(session->mgmtpool.queue, + (void*)&mtask, sizeof(void*))) { + spin_unlock_bh(&session->lock); + return -ENOSPC; + } + } + + /* + * pre-format CmdSN and ExpStatSN for outgoing PDU. + */ + if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { + hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) | + (session->age << ISCSI_AGE_SHIFT); + nop->cmdsn = cpu_to_be32(session->cmdsn); + if (conn->c_stage == ISCSI_CONN_STARTED && + !(hdr->opcode & ISCSI_OP_IMMEDIATE)) + session->cmdsn++; + } else + /* do not advance CmdSN */ + nop->cmdsn = cpu_to_be32(session->cmdsn); + + nop->exp_statsn = cpu_to_be32(conn->exp_statsn); + + if (data_size) { + memcpy(mtask->data, data, data_size); + mtask->data_count = data_size; + } else + mtask->data_count = 0; + + INIT_LIST_HEAD(&mtask->running); + memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); + if (session->tt->init_mgmt_task) + session->tt->init_mgmt_task(conn, mtask, data, data_size); + spin_unlock_bh(&session->lock); + + debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", + hdr->opcode, hdr->itt, data_size); + + /* + * since send_pdu() could be called at least from two contexts, + * we need to serialize __kfifo_put, so we don't have to take + * additional lock on fast data-path + */ + if (hdr->opcode & ISCSI_OP_IMMEDIATE) + __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); + else + __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); + + scsi_queue_work(session->host, &conn->xmitwork); + return 0; +} + +int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, + char *data, uint32_t data_size) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + int rc; + + mutex_lock(&conn->xmitmutex); + rc = iscsi_conn_send_generic(conn, hdr, data, data_size); + mutex_unlock(&conn->xmitmutex); + + return rc; +} +EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); + +void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) +{ + struct iscsi_session *session = class_to_transport_session(cls_session); + struct iscsi_conn *conn = session->leadconn; + + spin_lock_bh(&session->lock); + if (session->state != ISCSI_STATE_LOGGED_IN) { + session->recovery_failed = 1; + if (conn) + wake_up(&conn->ehwait); + } + spin_unlock_bh(&session->lock); +} +EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); + +int iscsi_eh_host_reset(struct scsi_cmnd *sc) +{ + struct Scsi_Host *host = sc->device->host; + struct iscsi_session *session = iscsi_hostdata(host->hostdata); + struct iscsi_conn *conn = session->leadconn; + int fail_session = 0; + + spin_lock_bh(&session->lock); + if (session->state == ISCSI_STATE_TERMINATE) { +failed: + debug_scsi("failing host reset: session terminated " + "[CID %d age %d]", conn->id, session->age); + spin_unlock_bh(&session->lock); + return FAILED; + } + + if (sc->SCp.phase == session->age) { + debug_scsi("failing connection CID %d due to SCSI host reset", + conn->id); + fail_session = 1; + } + spin_unlock_bh(&session->lock); + + /* + * we drop the lock here but the leadconn cannot be destoyed while + * we are in the scsi eh + */ + if (fail_session) { + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + /* + * if userspace cannot respond then we must kick this off + * here for it + */ + iscsi_start_session_recovery(session, conn, STOP_CONN_RECOVER); + } + + debug_scsi("iscsi_eh_host_reset wait for relogin\n"); + wait_event_interruptible(conn->ehwait, + session->state == ISCSI_STATE_TERMINATE || + session->state == ISCSI_STATE_LOGGED_IN || + session->recovery_failed); + if (signal_pending(current)) + flush_signals(current); + + spin_lock_bh(&session->lock); + if (session->state == ISCSI_STATE_LOGGED_IN) + printk(KERN_INFO "host reset succeeded\n"); + else + goto failed; + spin_unlock_bh(&session->lock); + + return SUCCESS; +} +EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); + +static void iscsi_tmabort_timedout(unsigned long data) +{ + struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; + struct iscsi_conn *conn = ctask->conn; + struct iscsi_session *session = conn->session; + + spin_lock(&session->lock); + if (conn->tmabort_state == TMABORT_INITIAL) { + conn->tmabort_state = TMABORT_TIMEDOUT; + debug_scsi("tmabort timedout [sc %p itt 0x%x]\n", + ctask->sc, ctask->itt); + /* unblock eh_abort() */ + wake_up(&conn->ehwait); + } + spin_unlock(&session->lock); +} + +/* must be called with the mutex lock */ +static int iscsi_exec_abort_task(struct scsi_cmnd *sc, + struct iscsi_cmd_task *ctask) +{ + struct iscsi_conn *conn = ctask->conn; + struct iscsi_session *session = conn->session; + struct iscsi_tm *hdr = &conn->tmhdr; + int rc; + + /* + * ctask timed out but session is OK requests must be serialized. + */ + memset(hdr, 0, sizeof(struct iscsi_tm)); + hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; + hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); + hdr->rtt = ctask->hdr->itt; + hdr->refcmdsn = ctask->hdr->cmdsn; + + rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, + NULL, 0); + if (rc) { + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc); + return rc; + } + + debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); + + spin_lock_bh(&session->lock); + ctask->mtask = (struct iscsi_mgmt_task *) + session->mgmt_cmds[(hdr->itt & ISCSI_ITT_MASK) - + ISCSI_MGMT_ITT_OFFSET]; + + if (conn->tmabort_state == TMABORT_INITIAL) { + conn->tmfcmd_pdus_cnt++; + conn->tmabort_timer.expires = 10*HZ + jiffies; + conn->tmabort_timer.function = iscsi_tmabort_timedout; + conn->tmabort_timer.data = (unsigned long)ctask; + add_timer(&conn->tmabort_timer); + debug_scsi("abort set timeout [itt 0x%x]", ctask->itt); + } + spin_unlock_bh(&session->lock); + mutex_unlock(&conn->xmitmutex); + + /* + * block eh thread until: + * + * 1) abort response + * 2) abort timeout + * 3) session is terminated or restarted or userspace has + * given up on recovery + */ + wait_event_interruptible(conn->ehwait, + sc->SCp.phase != session->age || + session->state != ISCSI_STATE_LOGGED_IN || + conn->tmabort_state != TMABORT_INITIAL || + session->recovery_failed); + if (signal_pending(current)) + flush_signals(current); + del_timer_sync(&conn->tmabort_timer); + + mutex_lock(&conn->xmitmutex); + return 0; +} + +/* + * xmit mutex and session lock must be held + */ +#define iscsi_remove_task(tasktype) \ +static struct iscsi_##tasktype * \ +iscsi_remove_##tasktype(struct kfifo *fifo, uint32_t itt) \ +{ \ + int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); \ + struct iscsi_##tasktype *task; \ + \ + debug_scsi("searching %d tasks\n", nr_tasks); \ + \ + for (i = 0; i < nr_tasks; i++) { \ + __kfifo_get(fifo, (void*)&task, sizeof(void*)); \ + debug_scsi("check task %u\n", task->itt); \ + \ + if (task->itt == itt) { \ + debug_scsi("matched task\n"); \ + break; \ + } \ + \ + __kfifo_put(fifo, (void*)&task, sizeof(void*)); \ + } \ + return NULL; \ +} + +iscsi_remove_task(mgmt_task); +iscsi_remove_task(cmd_task); + +static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) +{ + struct iscsi_conn *conn = ctask->conn; + struct iscsi_session *session = conn->session; + + if (!ctask->mtask) + return -EINVAL; + + if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt)) + list_del(&ctask->mtask->running); + __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, + sizeof(void*)); + ctask->mtask = NULL; + return 0; +} + +/* + * session lock and xmitmutex must be held + */ +static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, + int err) +{ + struct scsi_cmnd *sc; + + conn->session->tt->cleanup_cmd_task(conn, ctask); + iscsi_ctask_mtask_cleanup(ctask); + + sc = ctask->sc; + if (!sc) + return; + sc->result = err; + sc->resid = sc->request_bufflen; + iscsi_complete_command(conn->session, ctask); +} + +int iscsi_eh_abort(struct scsi_cmnd *sc) +{ + struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; + struct iscsi_conn *conn = ctask->conn; + struct iscsi_session *session = conn->session; + struct iscsi_cmd_task *pending_ctask; + int rc; + + conn->eh_abort_cnt++; + debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); + + mutex_lock(&conn->xmitmutex); + spin_lock_bh(&session->lock); + + /* + * If we are not logged in or we have started a new session + * then let the host reset code handle this + */ + if (session->state != ISCSI_STATE_LOGGED_IN || + sc->SCp.phase != session->age) + goto failed; + + /* ctask completed before time out */ + if (!ctask->sc) + goto success; + + /* what should we do here ? */ + if (conn->ctask == ctask) { + printk(KERN_INFO "sc %p itt 0x%x partially sent. Failing " + "abort\n", sc, ctask->itt); + goto failed; + } + + /* check for the easy pending cmd abort */ + pending_ctask = iscsi_remove_cmd_task(conn->xmitqueue, ctask->itt); + if (pending_ctask) { + /* iscsi_tcp queues write transfers on the xmitqueue */ + if (list_empty(&pending_ctask->running)) { + debug_scsi("found pending task\n"); + goto success; + } else + __kfifo_put(conn->xmitqueue, (void*)&pending_ctask, + sizeof(void*)); + } + + conn->tmabort_state = TMABORT_INITIAL; + + spin_unlock_bh(&session->lock); + rc = iscsi_exec_abort_task(sc, ctask); + spin_lock_bh(&session->lock); + + iscsi_ctask_mtask_cleanup(ctask); + if (rc || sc->SCp.phase != session->age || + session->state != ISCSI_STATE_LOGGED_IN) + goto failed; + + /* ctask completed before tmf abort response */ + if (!ctask->sc) { + debug_scsi("sc completed while abort in progress\n"); + goto success; + } + + if (conn->tmabort_state != TMABORT_SUCCESS) { + spin_unlock_bh(&session->lock); + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + spin_lock_bh(&session->lock); + goto failed; + } + +success: + debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); + spin_unlock_bh(&session->lock); + + /* + * clean up task if aborted. we have the xmitmutex so grab + * the recv lock as a writer + */ + write_lock_bh(conn->recv_lock); + spin_lock(&session->lock); + fail_command(conn, ctask, DID_ABORT << 16); + spin_unlock(&session->lock); + write_unlock_bh(conn->recv_lock); + + mutex_unlock(&conn->xmitmutex); + return SUCCESS; + +failed: + spin_unlock_bh(&session->lock); + mutex_unlock(&conn->xmitmutex); + + debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); + return FAILED; +} +EXPORT_SYMBOL_GPL(iscsi_eh_abort); + +int +iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) +{ + int i; + + *items = kmalloc(max * sizeof(void*), GFP_KERNEL); + if (*items == NULL) + return -ENOMEM; + + q->max = max; + q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); + if (q->pool == NULL) { + kfree(*items); + return -ENOMEM; + } + + q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), + GFP_KERNEL, NULL); + if (q->queue == ERR_PTR(-ENOMEM)) { + kfree(q->pool); + kfree(*items); + return -ENOMEM; + } + + for (i = 0; i < max; i++) { + q->pool[i] = kmalloc(item_size, GFP_KERNEL); + if (q->pool[i] == NULL) { + int j; + + for (j = 0; j < i; j++) + kfree(q->pool[j]); + + kfifo_free(q->queue); + kfree(q->pool); + kfree(*items); + return -ENOMEM; + } + memset(q->pool[i], 0, item_size); + (*items)[i] = q->pool[i]; + __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); + } + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_pool_init); + +void iscsi_pool_free(struct iscsi_queue *q, void **items) +{ + int i; + + for (i = 0; i < q->max; i++) + kfree(items[i]); + kfree(q->pool); + kfree(items); +} +EXPORT_SYMBOL_GPL(iscsi_pool_free); + +/* + * iSCSI Session's hostdata organization: + * + * *------------------* <== hostdata_session(host->hostdata) + * | ptr to class sess| + * |------------------| <== iscsi_hostdata(host->hostdata) + * | iscsi_session | + * *------------------* + */ + +#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ + _sz % sizeof(unsigned long)) + +#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) + +/** + * iscsi_session_setup - create iscsi cls session and host and session + * @scsit: scsi transport template + * @iscsit: iscsi transport template + * @initial_cmdsn: initial CmdSN + * @hostno: host no allocated + * + * This can be used by software iscsi_transports that allocate + * a session per scsi host. + **/ +struct iscsi_cls_session * +iscsi_session_setup(struct iscsi_transport *iscsit, + struct scsi_transport_template *scsit, + int cmd_task_size, int mgmt_task_size, + uint32_t initial_cmdsn, uint32_t *hostno) +{ + struct Scsi_Host *shost; + struct iscsi_session *session; + struct iscsi_cls_session *cls_session; + int cmd_i; + + shost = scsi_host_alloc(iscsit->host_template, + hostdata_privsize(sizeof(*session))); + if (!shost) + return NULL; + + shost->max_id = 1; + shost->max_channel = 0; + shost->max_lun = iscsit->max_lun; + shost->max_cmd_len = iscsit->max_cmd_len; + shost->transportt = scsit; + shost->transportt->create_work_queue = 1; + *hostno = shost->host_no; + + session = iscsi_hostdata(shost->hostdata); + memset(session, 0, sizeof(struct iscsi_session)); + session->host = shost; + session->state = ISCSI_STATE_FREE; + session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; + session->cmds_max = ISCSI_XMIT_CMDS_MAX; + session->cmdsn = initial_cmdsn; + session->exp_cmdsn = initial_cmdsn + 1; + session->max_cmdsn = initial_cmdsn + 1; + session->max_r2t = 1; + session->tt = iscsit; + + /* initialize SCSI PDU commands pool */ + if (iscsi_pool_init(&session->cmdpool, session->cmds_max, + (void***)&session->cmds, + cmd_task_size + sizeof(struct iscsi_cmd_task))) + goto cmdpool_alloc_fail; + + /* pre-format cmds pool with ITT */ + for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { + struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; + + if (cmd_task_size) + ctask->dd_data = &ctask[1]; + ctask->itt = cmd_i; + } + + spin_lock_init(&session->lock); + INIT_LIST_HEAD(&session->connections); + + /* initialize immediate command pool */ + if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, + (void***)&session->mgmt_cmds, + mgmt_task_size + sizeof(struct iscsi_mgmt_task))) + goto mgmtpool_alloc_fail; + + + /* pre-format immediate cmds pool with ITT */ + for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { + struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; + + if (mgmt_task_size) + mtask->dd_data = &mtask[1]; + mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; + mtask->data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, + GFP_KERNEL); + if (!mtask->data) { + int j; + + for (j = 0; j < cmd_i; j++) + kfree(session->mgmt_cmds[j]->data); + goto immdata_alloc_fail; + } + } + + if (scsi_add_host(shost, NULL)) + goto add_host_fail; + + cls_session = iscsi_create_session(shost, iscsit, 0); + if (!cls_session) + goto cls_session_fail; + *(unsigned long*)shost->hostdata = (unsigned long)cls_session; + + return cls_session; + +cls_session_fail: + scsi_remove_host(shost); +add_host_fail: + for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) + kfree(session->mgmt_cmds[cmd_i]->data); +immdata_alloc_fail: + iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); +mgmtpool_alloc_fail: + iscsi_pool_free(&session->cmdpool, (void**)session->cmds); +cmdpool_alloc_fail: + scsi_host_put(shost); + return NULL; +} +EXPORT_SYMBOL_GPL(iscsi_session_setup); + +/** + * iscsi_session_teardown - destroy session, host, and cls_session + * shost: scsi host + * + * This can be used by software iscsi_transports that allocate + * a session per scsi host. + **/ +void iscsi_session_teardown(struct iscsi_cls_session *cls_session) +{ + struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); + struct iscsi_session *session = iscsi_hostdata(shost->hostdata); + int cmd_i; + + scsi_remove_host(shost); + + for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) + kfree(session->mgmt_cmds[cmd_i]->data); + + iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); + iscsi_pool_free(&session->cmdpool, (void**)session->cmds); + + iscsi_destroy_session(cls_session); + scsi_host_put(shost); +} +EXPORT_SYMBOL_GPL(iscsi_session_teardown); + +/** + * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn + * @cls_session: iscsi_cls_session + * @conn_idx: cid + **/ +struct iscsi_cls_conn * +iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) +{ + struct iscsi_session *session = class_to_transport_session(cls_session); + struct iscsi_conn *conn; + struct iscsi_cls_conn *cls_conn; + + cls_conn = iscsi_create_conn(cls_session, conn_idx); + if (!cls_conn) + return NULL; + conn = cls_conn->dd_data; + memset(conn, 0, sizeof(*conn)); + + conn->session = session; + conn->cls_conn = cls_conn; + conn->c_stage = ISCSI_CONN_INITIAL_STAGE; + conn->id = conn_idx; + conn->exp_statsn = 0; + conn->tmabort_state = TMABORT_INITIAL; + INIT_LIST_HEAD(&conn->run_list); + INIT_LIST_HEAD(&conn->mgmt_run_list); + + /* initialize general xmit PDU commands queue */ + conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*), + GFP_KERNEL, NULL); + if (conn->xmitqueue == ERR_PTR(-ENOMEM)) + goto xmitqueue_alloc_fail; + + /* initialize general immediate & non-immediate PDU commands queue */ + conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), + GFP_KERNEL, NULL); + if (conn->immqueue == ERR_PTR(-ENOMEM)) + goto immqueue_alloc_fail; + + conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), + GFP_KERNEL, NULL); + if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) + goto mgmtqueue_alloc_fail; + + INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn); + + /* allocate login_mtask used for the login/text sequences */ + spin_lock_bh(&session->lock); + if (!__kfifo_get(session->mgmtpool.queue, + (void*)&conn->login_mtask, + sizeof(void*))) { + spin_unlock_bh(&session->lock); + goto login_mtask_alloc_fail; + } + spin_unlock_bh(&session->lock); + + init_timer(&conn->tmabort_timer); + mutex_init(&conn->xmitmutex); + init_waitqueue_head(&conn->ehwait); + + return cls_conn; + +login_mtask_alloc_fail: + kfifo_free(conn->mgmtqueue); +mgmtqueue_alloc_fail: + kfifo_free(conn->immqueue); +immqueue_alloc_fail: + kfifo_free(conn->xmitqueue); +xmitqueue_alloc_fail: + iscsi_destroy_conn(cls_conn); + return NULL; +} +EXPORT_SYMBOL_GPL(iscsi_conn_setup); + +/** + * iscsi_conn_teardown - teardown iscsi connection + * cls_conn: iscsi class connection + * + * TODO: we may need to make this into a two step process + * like scsi-mls remove + put host + */ +void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_session *session = conn->session; + unsigned long flags; + + mutex_lock(&conn->xmitmutex); + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE) { + if (session->tt->suspend_conn_recv) + session->tt->suspend_conn_recv(conn); + + session->tt->terminate_conn(conn); + } + + spin_lock_bh(&session->lock); + conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; + if (session->leadconn == conn) { + /* + * leading connection? then give up on recovery. + */ + session->state = ISCSI_STATE_TERMINATE; + wake_up(&conn->ehwait); + } + spin_unlock_bh(&session->lock); + + mutex_unlock(&conn->xmitmutex); + + /* + * Block until all in-progress commands for this connection + * time out or fail. + */ + for (;;) { + spin_lock_irqsave(session->host->host_lock, flags); + if (!session->host->host_busy) { /* OK for ERL == 0 */ + spin_unlock_irqrestore(session->host->host_lock, flags); + break; + } + spin_unlock_irqrestore(session->host->host_lock, flags); + msleep_interruptible(500); + printk("conn_destroy(): host_busy %d host_failed %d\n", + session->host->host_busy, session->host->host_failed); + /* + * force eh_abort() to unblock + */ + wake_up(&conn->ehwait); + } + + spin_lock_bh(&session->lock); + __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, + sizeof(void*)); + list_del(&conn->item); + if (list_empty(&session->connections)) + session->leadconn = NULL; + if (session->leadconn && session->leadconn == conn) + session->leadconn = container_of(session->connections.next, + struct iscsi_conn, item); + + if (session->leadconn == NULL) + /* no connections exits.. reset sequencing */ + session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; + spin_unlock_bh(&session->lock); + + kfifo_free(conn->xmitqueue); + kfifo_free(conn->immqueue); + kfifo_free(conn->mgmtqueue); + + iscsi_destroy_conn(cls_conn); +} +EXPORT_SYMBOL_GPL(iscsi_conn_teardown); + +int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_session *session = conn->session; + + if (session == NULL) { + printk(KERN_ERR "iscsi: can't start unbound connection\n"); + return -EPERM; + } + + spin_lock_bh(&session->lock); + conn->c_stage = ISCSI_CONN_STARTED; + session->state = ISCSI_STATE_LOGGED_IN; + + switch(conn->stop_stage) { + case STOP_CONN_RECOVER: + /* + * unblock eh_abort() if it is blocked. re-try all + * commands after successful recovery + */ + session->conn_cnt++; + conn->stop_stage = 0; + conn->tmabort_state = TMABORT_INITIAL; + session->age++; + session->recovery_failed = 0; + spin_unlock_bh(&session->lock); + + iscsi_unblock_session(session_to_cls(session)); + wake_up(&conn->ehwait); + return 0; + case STOP_CONN_TERM: + session->conn_cnt++; + conn->stop_stage = 0; + break; + case STOP_CONN_SUSPEND: + conn->stop_stage = 0; + clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); + clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + break; + default: + break; + } + spin_unlock_bh(&session->lock); + + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_conn_start); + +static void +flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) +{ + struct iscsi_mgmt_task *mtask, *tmp; + + /* handle pending */ + while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) || + __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { + if (mtask == conn->login_mtask) + continue; + debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); + __kfifo_put(session->mgmtpool.queue, (void*)&mtask, + sizeof(void*)); + } + + /* handle running */ + list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { + debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); + if (mtask == conn->login_mtask) + continue; + list_del(&mtask->running); + __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, + sizeof(void*)); + } + + conn->mtask = NULL; +} + +/* Fail commands. Mutex and session lock held and recv side suspended */ +static void fail_all_commands(struct iscsi_conn *conn) +{ + struct iscsi_cmd_task *ctask, *tmp; + + /* flush pending */ + while (__kfifo_get(conn->xmitqueue, (void*)&ctask, sizeof(void*))) { + debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, + ctask->itt); + fail_command(conn, ctask, DID_BUS_BUSY << 16); + } + + /* fail all other running */ + list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { + debug_scsi("failing in progress sc %p itt 0x%x\n", + ctask->sc, ctask->itt); + fail_command(conn, ctask, DID_BUS_BUSY << 16); + } + + conn->ctask = NULL; +} + +void iscsi_start_session_recovery(struct iscsi_session *session, + struct iscsi_conn *conn, int flag) +{ + spin_lock_bh(&session->lock); + if (conn->stop_stage == STOP_CONN_RECOVER || + conn->stop_stage == STOP_CONN_TERM) { + spin_unlock_bh(&session->lock); + return; + } + conn->stop_stage = flag; + spin_unlock_bh(&session->lock); + + if (session->tt->suspend_conn_recv) + session->tt->suspend_conn_recv(conn); + + mutex_lock(&conn->xmitmutex); + spin_lock_bh(&session->lock); + conn->c_stage = ISCSI_CONN_STOPPED; + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + + session->conn_cnt--; + if (session->conn_cnt == 0 || session->leadconn == conn) + session->state = ISCSI_STATE_FAILED; + + spin_unlock_bh(&session->lock); + + session->tt->terminate_conn(conn); + /* + * flush queues. + */ + spin_lock_bh(&session->lock); + fail_all_commands(conn); + flush_control_queues(session, conn); + spin_unlock_bh(&session->lock); + + /* + * for connection level recovery we should not calculate + * header digest. conn->hdr_size used for optimization + * in hdr_extract() and will be re-negotiated at + * set_param() time. + */ + if (flag == STOP_CONN_RECOVER) { + conn->hdrdgst_en = 0; + conn->datadgst_en = 0; + + if (session->state == ISCSI_STATE_FAILED) + iscsi_block_session(session_to_cls(session)); + } + mutex_unlock(&conn->xmitmutex); +} +EXPORT_SYMBOL_GPL(iscsi_start_session_recovery); + +void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_session *session = conn->session; + + switch (flag) { + case STOP_CONN_RECOVER: + case STOP_CONN_TERM: + iscsi_start_session_recovery(session, conn, flag); + return; + case STOP_CONN_SUSPEND: + if (session->tt->suspend_conn_recv) + session->tt->suspend_conn_recv(conn); + + mutex_lock(&conn->xmitmutex); + spin_lock_bh(&session->lock); + + conn->stop_stage = flag; + conn->c_stage = ISCSI_CONN_STOPPED; + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + + spin_unlock_bh(&session->lock); + mutex_unlock(&conn->xmitmutex); + break; + default: + printk(KERN_ERR "invalid stop flag %d\n", flag); + } +} +EXPORT_SYMBOL_GPL(iscsi_conn_stop); + +int iscsi_conn_bind(struct iscsi_cls_session *cls_session, + struct iscsi_cls_conn *cls_conn, int is_leading) +{ + struct iscsi_session *session = class_to_transport_session(cls_session); + struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data; + + /* lookup for existing connection */ + spin_lock_bh(&session->lock); + list_for_each_entry(tmp, &session->connections, item) { + if (tmp == conn) { + if (conn->c_stage != ISCSI_CONN_STOPPED || + conn->stop_stage == STOP_CONN_TERM) { + printk(KERN_ERR "iscsi_tcp: can't bind " + "non-stopped connection (%d:%d)\n", + conn->c_stage, conn->stop_stage); + spin_unlock_bh(&session->lock); + return -EIO; + } + break; + } + } + if (tmp != conn) { + /* bind new iSCSI connection to session */ + conn->session = session; + list_add(&conn->item, &session->connections); + } + spin_unlock_bh(&session->lock); + + if (is_leading) + session->leadconn = conn; + + /* + * Unblock xmitworker(), Login Phase will pass through. + */ + clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); + clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_conn_bind); + +MODULE_AUTHOR("Mike Christie"); +MODULE_DESCRIPTION("iSCSI library functions"); +MODULE_LICENSE("GPL"); diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c index c750d3399a9..ae13e4a78d5 100644 --- a/drivers/scsi/scsi_devinfo.c +++ b/drivers/scsi/scsi_devinfo.c @@ -157,6 +157,8 @@ static struct { {"HITACHI", "DF400", "*", BLIST_SPARSELUN}, {"HITACHI", "DF500", "*", BLIST_SPARSELUN}, {"HITACHI", "DF600", "*", BLIST_SPARSELUN}, + {"HITACHI", "DISK-SUBSYSTEM", "*", BLIST_ATTACH_PQ3 | BLIST_SPARSELUN | BLIST_LARGELUN}, + {"HITACHI", "OPEN-E", "*", BLIST_ATTACH_PQ3 | BLIST_SPARSELUN | BLIST_LARGELUN}, {"HP", "A6189A", NULL, BLIST_SPARSELUN | BLIST_LARGELUN}, /* HP VA7400 */ {"HP", "OPEN-", "*", BLIST_SPARSELUN | BLIST_LARGELUN}, /* HP XP Arrays */ {"HP", "NetRAID-4M", NULL, BLIST_FORCELUN}, diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 1a5474bd11a..5c7e51f9efe 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -816,6 +816,29 @@ static inline void scsi_destroy_sdev(struct scsi_device *sdev) put_device(&sdev->sdev_gendev); } +/** + * scsi_inq_str - print INQUIRY data from min to max index, + * strip trailing whitespace + * @buf: Output buffer with at least end-first+1 bytes of space + * @inq: Inquiry buffer (input) + * @first: Offset of string into inq + * @end: Index after last character in inq + */ +static unsigned char* scsi_inq_str(unsigned char* buf, unsigned char *inq, + unsigned first, unsigned end) +{ + unsigned term = 0, idx; + for (idx = 0; idx+first < end && idx+first < inq[4]+5; ++idx) { + if (inq[idx+first] > 0x20) { + buf[idx] = inq[idx+first]; + term = idx+1; + } else { + buf[idx] = ' '; + } + } + buf[term] = 0; + return buf; +} /** * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it @@ -880,10 +903,12 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget, if (scsi_probe_lun(sdev, result, result_len, &bflags)) goto out_free_result; + if (bflagsp) + *bflagsp = bflags; /* * result contains valid SCSI INQUIRY data. */ - if ((result[0] >> 5) == 3) { + if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) { /* * For a Peripheral qualifier 3 (011b), the SCSI * spec says: The device server is not capable of @@ -894,9 +919,18 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget, * logical disk configured at sdev->lun, but there * is a target id responding. */ - SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO - "scsi scan: peripheral qualifier of 3," - " no device added\n")); + SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:" + " peripheral qualifier of 3, device not" + " added\n")) + if (lun == 0) { + unsigned char vend[9], mod[17]; + SCSI_LOG_SCAN_BUS(1, sdev_printk(KERN_INFO, sdev, + "scsi scan: consider passing scsi_mod." + "dev_flags=%s:%s:0x240 or 0x800240\n", + scsi_inq_str(vend, result, 8, 16), + scsi_inq_str(mod, result, 16, 32))); + } + res = SCSI_SCAN_TARGET_PRESENT; goto out_free_result; } @@ -920,8 +954,6 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget, sdev->lockable = 0; scsi_unlock_floptical(sdev, result); } - if (bflagsp) - *bflagsp = bflags; } out_free_result: @@ -946,7 +978,6 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget, * scsi_sequential_lun_scan - sequentially scan a SCSI target * @starget: pointer to target structure to scan * @bflags: black/white list flag for LUN 0 - * @lun0_res: result of scanning LUN 0 * * Description: * Generally, scan from LUN 1 (LUN 0 is assumed to already have been @@ -956,8 +987,7 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget, * Modifies sdevscan->lun. **/ static void scsi_sequential_lun_scan(struct scsi_target *starget, - int bflags, int lun0_res, int scsi_level, - int rescan) + int bflags, int scsi_level, int rescan) { unsigned int sparse_lun, lun, max_dev_lun; struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); @@ -978,13 +1008,6 @@ static void scsi_sequential_lun_scan(struct scsi_target *starget, sparse_lun = 0; /* - * If not sparse lun and no device attached at LUN 0 do not scan - * any further. - */ - if (!sparse_lun && (lun0_res != SCSI_SCAN_LUN_PRESENT)) - return; - - /* * If less than SCSI_1_CSS, and no special lun scaning, stop * scanning; this matches 2.4 behaviour, but could just be a bug * (to continue scanning a SCSI_1_CSS device). @@ -1395,7 +1418,7 @@ static void __scsi_scan_target(struct device *parent, unsigned int channel, * do a sequential scan. */ scsi_sequential_lun_scan(starget, bflags, - res, starget->scsi_level, rescan); + starget->scsi_level, rescan); } out_reap: diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index 2730d507e58..bc9071d2d21 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -31,31 +31,25 @@ #include <scsi/scsi_transport_iscsi.h> #include <scsi/iscsi_if.h> -#define ISCSI_SESSION_ATTRS 8 -#define ISCSI_CONN_ATTRS 6 +#define ISCSI_SESSION_ATTRS 11 +#define ISCSI_CONN_ATTRS 10 +#define ISCSI_HOST_ATTRS 0 struct iscsi_internal { struct scsi_transport_template t; struct iscsi_transport *iscsi_transport; struct list_head list; - /* - * based on transport capabilities, at register time we set these - * bits to tell the transport class it wants attributes displayed - * in sysfs or that it can support different iSCSI Data-Path - * capabilities - */ - uint32_t param_mask; - struct class_device cdev; - /* - * We do not have any private or other attrs. - */ + + struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; struct transport_container conn_cont; struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; struct transport_container session_cont; struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; }; +static int iscsi_session_nr; /* sysfs session id for next new session */ + /* * list of registered transports and lock that must * be held while accessing list. The iscsi_transport_lock must @@ -120,6 +114,24 @@ static struct attribute_group iscsi_transport_group = { .attrs = iscsi_transport_attrs, }; +static int iscsi_setup_host(struct transport_container *tc, struct device *dev, + struct class_device *cdev) +{ + struct Scsi_Host *shost = dev_to_shost(dev); + struct iscsi_host *ihost = shost->shost_data; + + memset(ihost, 0, sizeof(*ihost)); + INIT_LIST_HEAD(&ihost->sessions); + mutex_init(&ihost->mutex); + return 0; +} + +static DECLARE_TRANSPORT_CLASS(iscsi_host_class, + "iscsi_host", + iscsi_setup_host, + NULL, + NULL); + static DECLARE_TRANSPORT_CLASS(iscsi_session_class, "iscsi_session", NULL, @@ -165,14 +177,23 @@ static DEFINE_SPINLOCK(sesslock); static LIST_HEAD(connlist); static DEFINE_SPINLOCK(connlock); -static struct iscsi_cls_session *iscsi_session_lookup(uint64_t handle) +static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) +{ + struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); + return sess->sid; +} + +/* + * Returns the matching session to a given sid + */ +static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) { unsigned long flags; struct iscsi_cls_session *sess; spin_lock_irqsave(&sesslock, flags); list_for_each_entry(sess, &sesslist, sess_list) { - if (sess == iscsi_ptr(handle)) { + if (sess->sid == sid) { spin_unlock_irqrestore(&sesslock, flags); return sess; } @@ -181,14 +202,17 @@ static struct iscsi_cls_session *iscsi_session_lookup(uint64_t handle) return NULL; } -static struct iscsi_cls_conn *iscsi_conn_lookup(uint64_t handle) +/* + * Returns the matching connection to a given sid / cid tuple + */ +static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) { unsigned long flags; struct iscsi_cls_conn *conn; spin_lock_irqsave(&connlock, flags); list_for_each_entry(conn, &connlist, conn_list) { - if (conn == iscsi_ptr(handle)) { + if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { spin_unlock_irqrestore(&connlock, flags); return conn; } @@ -209,6 +233,7 @@ static void iscsi_session_release(struct device *dev) shost = iscsi_session_to_shost(session); scsi_host_put(shost); + kfree(session->targetname); kfree(session); module_put(transport->owner); } @@ -218,30 +243,95 @@ static int iscsi_is_session_dev(const struct device *dev) return dev->release == iscsi_session_release; } +static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, + uint id, uint lun) +{ + struct iscsi_host *ihost = shost->shost_data; + struct iscsi_cls_session *session; + + mutex_lock(&ihost->mutex); + list_for_each_entry(session, &ihost->sessions, host_list) { + if ((channel == SCAN_WILD_CARD || + channel == session->channel) && + (id == SCAN_WILD_CARD || id == session->target_id)) + scsi_scan_target(&session->dev, session->channel, + session->target_id, lun, 1); + } + mutex_unlock(&ihost->mutex); + + return 0; +} + +static void session_recovery_timedout(void *data) +{ + struct iscsi_cls_session *session = data; + + dev_printk(KERN_INFO, &session->dev, "session recovery timed out " + "after %d secs\n", session->recovery_tmo); + + if (session->transport->session_recovery_timedout) + session->transport->session_recovery_timedout(session); + + scsi_target_unblock(&session->dev); +} + +void iscsi_unblock_session(struct iscsi_cls_session *session) +{ + if (!cancel_delayed_work(&session->recovery_work)) + flush_scheduled_work(); + scsi_target_unblock(&session->dev); +} +EXPORT_SYMBOL_GPL(iscsi_unblock_session); + +void iscsi_block_session(struct iscsi_cls_session *session) +{ + scsi_target_block(&session->dev); + schedule_delayed_work(&session->recovery_work, + session->recovery_tmo * HZ); +} +EXPORT_SYMBOL_GPL(iscsi_block_session); + /** * iscsi_create_session - create iscsi class session * @shost: scsi host * @transport: iscsi transport * - * This can be called from a LLD or iscsi_transport + * This can be called from a LLD or iscsi_transport. **/ struct iscsi_cls_session * -iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport) +iscsi_create_session(struct Scsi_Host *shost, + struct iscsi_transport *transport, int channel) { + struct iscsi_host *ihost; struct iscsi_cls_session *session; int err; if (!try_module_get(transport->owner)) return NULL; - session = kzalloc(sizeof(*session), GFP_KERNEL); + session = kzalloc(sizeof(*session) + transport->sessiondata_size, + GFP_KERNEL); if (!session) goto module_put; session->transport = transport; + session->recovery_tmo = 120; + INIT_WORK(&session->recovery_work, session_recovery_timedout, session); + INIT_LIST_HEAD(&session->host_list); + INIT_LIST_HEAD(&session->sess_list); + + if (transport->sessiondata_size) + session->dd_data = &session[1]; /* this is released in the dev's release function */ scsi_host_get(shost); - snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", shost->host_no); + ihost = shost->shost_data; + + session->sid = iscsi_session_nr++; + session->channel = channel; + session->target_id = ihost->next_target_id++; + + snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", + session->sid); session->dev.parent = &shost->shost_gendev; session->dev.release = iscsi_session_release; err = device_register(&session->dev); @@ -252,6 +342,10 @@ iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport) } transport_register_device(&session->dev); + mutex_lock(&ihost->mutex); + list_add(&session->host_list, &ihost->sessions); + mutex_unlock(&ihost->mutex); + return session; free_session: @@ -272,6 +366,16 @@ EXPORT_SYMBOL_GPL(iscsi_create_session); **/ int iscsi_destroy_session(struct iscsi_cls_session *session) { + struct Scsi_Host *shost = iscsi_session_to_shost(session); + struct iscsi_host *ihost = shost->shost_data; + + if (!cancel_delayed_work(&session->recovery_work)) + flush_scheduled_work(); + + mutex_lock(&ihost->mutex); + list_del(&session->host_list); + mutex_unlock(&ihost->mutex); + transport_unregister_device(&session->dev); device_unregister(&session->dev); return 0; @@ -284,6 +388,7 @@ static void iscsi_conn_release(struct device *dev) struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); struct device *parent = conn->dev.parent; + kfree(conn->persistent_address); kfree(conn); put_device(parent); } @@ -301,12 +406,16 @@ static int iscsi_is_conn_dev(const struct device *dev) * This can be called from a LLD or iscsi_transport. The connection * is child of the session so cid must be unique for all connections * on the session. + * + * Since we do not support MCS, cid will normally be zero. In some cases + * for software iscsi we could be trying to preallocate a connection struct + * in which case there could be two connection structs and cid would be + * non-zero. **/ struct iscsi_cls_conn * iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) { struct iscsi_transport *transport = session->transport; - struct Scsi_Host *shost = iscsi_session_to_shost(session); struct iscsi_cls_conn *conn; int err; @@ -319,12 +428,14 @@ iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) INIT_LIST_HEAD(&conn->conn_list); conn->transport = transport; + conn->cid = cid; /* this is released in the dev's release function */ if (!get_device(&session->dev)) goto free_conn; + snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", - shost->host_no, cid); + session->sid, cid); conn->dev.parent = &session->dev; conn->dev.release = iscsi_conn_release; err = device_register(&conn->dev); @@ -361,105 +472,6 @@ int iscsi_destroy_conn(struct iscsi_cls_conn *conn) EXPORT_SYMBOL_GPL(iscsi_destroy_conn); /* - * These functions are used only by software iscsi_transports - * which do not allocate and more their scsi_hosts since this - * is initiated from userspace. - */ - -/* - * iSCSI Session's hostdata organization: - * - * *------------------* <== hostdata_session(host->hostdata) - * | ptr to class sess| - * |------------------| <== iscsi_hostdata(host->hostdata) - * | transport's data | - * *------------------* - */ - -#define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \ - _t->hostdata_size % sizeof(unsigned long)) - -#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) - -/** - * iscsi_transport_create_session - create iscsi cls session and host - * scsit: scsi transport template - * transport: iscsi transport template - * - * This can be used by software iscsi_transports that allocate - * a session per scsi host. - **/ -struct Scsi_Host * -iscsi_transport_create_session(struct scsi_transport_template *scsit, - struct iscsi_transport *transport) -{ - struct iscsi_cls_session *session; - struct Scsi_Host *shost; - unsigned long flags; - - shost = scsi_host_alloc(transport->host_template, - hostdata_privsize(transport)); - if (!shost) { - printk(KERN_ERR "iscsi: can not allocate SCSI host for " - "session\n"); - return NULL; - } - - shost->max_id = 1; - shost->max_channel = 0; - shost->max_lun = transport->max_lun; - shost->max_cmd_len = transport->max_cmd_len; - shost->transportt = scsit; - shost->transportt->create_work_queue = 1; - - if (scsi_add_host(shost, NULL)) - goto free_host; - - session = iscsi_create_session(shost, transport); - if (!session) - goto remove_host; - - *(unsigned long*)shost->hostdata = (unsigned long)session; - spin_lock_irqsave(&sesslock, flags); - list_add(&session->sess_list, &sesslist); - spin_unlock_irqrestore(&sesslock, flags); - return shost; - -remove_host: - scsi_remove_host(shost); -free_host: - scsi_host_put(shost); - return NULL; -} - -EXPORT_SYMBOL_GPL(iscsi_transport_create_session); - -/** - * iscsi_transport_destroy_session - destroy session and scsi host - * shost: scsi host - * - * This can be used by software iscsi_transports that allocate - * a session per scsi host. - **/ -int iscsi_transport_destroy_session(struct Scsi_Host *shost) -{ - struct iscsi_cls_session *session; - unsigned long flags; - - scsi_remove_host(shost); - session = hostdata_session(shost->hostdata); - spin_lock_irqsave(&sesslock, flags); - list_del(&session->sess_list); - spin_unlock_irqrestore(&sesslock, flags); - iscsi_destroy_session(session); - /* ref from host alloc */ - scsi_host_put(shost); - return 0; -} - -EXPORT_SYMBOL_GPL(iscsi_transport_destroy_session); - -/* * iscsi interface functions */ static struct iscsi_internal * @@ -574,6 +586,7 @@ iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb) } spin_lock_irqsave(&zone->freelock, flags); + INIT_LIST_HEAD(skb_to_lh(skb)); list_add(skb_to_lh(skb), &zone->freequeue); spin_unlock_irqrestore(&zone->freelock, flags); @@ -607,7 +620,8 @@ int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, ev->type = ISCSI_KEVENT_RECV_PDU; if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) ev->iferror = -ENOMEM; - ev->r.recv_req.conn_handle = iscsi_handle(conn); + ev->r.recv_req.cid = conn->cid; + ev->r.recv_req.sid = iscsi_conn_get_sid(conn); pdu = (char*)ev + sizeof(*ev); memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); @@ -639,7 +653,8 @@ void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat) ev->iferror = -ENOMEM; ev->r.connerror.error = error; - ev->r.connerror.conn_handle = iscsi_handle(conn); + ev->r.connerror.cid = conn->cid; + ev->r.connerror.sid = iscsi_conn_get_sid(conn); iscsi_unicast_skb(conn->z_error, skb); @@ -689,7 +704,7 @@ iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) ISCSI_STATS_CUSTOM_MAX); int err = 0; - conn = iscsi_conn_lookup(ev->u.get_stats.conn_handle); + conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); if (!conn) return -EEXIST; @@ -713,8 +728,10 @@ iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) evstat->type = nlh->nlmsg_type; if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) evstat->iferror = -ENOMEM; - evstat->u.get_stats.conn_handle = - ev->u.get_stats.conn_handle; + evstat->u.get_stats.cid = + ev->u.get_stats.cid; + evstat->u.get_stats.sid = + ev->u.get_stats.sid; stats = (struct iscsi_stats *) ((char*)evstat + sizeof(*evstat)); memset(stats, 0, sizeof(*stats)); @@ -740,16 +757,21 @@ iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) { struct iscsi_transport *transport = priv->iscsi_transport; struct iscsi_cls_session *session; - uint32_t sid; + unsigned long flags; + uint32_t hostno; - session = transport->create_session(&priv->t, + session = transport->create_session(transport, &priv->t, ev->u.c_session.initial_cmdsn, - &sid); + &hostno); if (!session) return -ENOMEM; - ev->r.c_session_ret.session_handle = iscsi_handle(session); - ev->r.c_session_ret.sid = sid; + spin_lock_irqsave(&sesslock, flags); + list_add(&session->sess_list, &sesslist); + spin_unlock_irqrestore(&sesslock, flags); + + ev->r.c_session_ret.host_no = hostno; + ev->r.c_session_ret.sid = session->sid; return 0; } @@ -760,13 +782,20 @@ iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) struct iscsi_cls_session *session; unsigned long flags; - session = iscsi_session_lookup(ev->u.c_conn.session_handle); - if (!session) + session = iscsi_session_lookup(ev->u.c_conn.sid); + if (!session) { + printk(KERN_ERR "iscsi: invalid session %d\n", + ev->u.c_conn.sid); return -EINVAL; + } conn = transport->create_conn(session, ev->u.c_conn.cid); - if (!conn) + if (!conn) { + printk(KERN_ERR "iscsi: couldn't create a new " + "connection for session %d\n", + session->sid); return -ENOMEM; + } conn->z_pdu = mempool_zone_init(Z_MAX_PDU, NLMSG_SPACE(sizeof(struct iscsi_uevent) + @@ -788,7 +817,8 @@ iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) goto free_pdu_pool; } - ev->r.handle = iscsi_handle(conn); + ev->r.c_conn_ret.sid = session->sid; + ev->r.c_conn_ret.cid = conn->cid; spin_lock_irqsave(&connlock, flags); list_add(&conn->conn_list, &connlist); @@ -812,7 +842,7 @@ iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev struct iscsi_cls_conn *conn; struct mempool_zone *z_error, *z_pdu; - conn = iscsi_conn_lookup(ev->u.d_conn.conn_handle); + conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); if (!conn) return -EINVAL; spin_lock_irqsave(&connlock, flags); @@ -832,6 +862,72 @@ iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev return 0; } +static void +iscsi_copy_param(struct iscsi_uevent *ev, uint32_t *value, char *data) +{ + if (ev->u.set_param.len != sizeof(uint32_t)) + BUG(); + memcpy(value, data, min_t(uint32_t, sizeof(uint32_t), + ev->u.set_param.len)); +} + +static int +iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) +{ + char *data = (char*)ev + sizeof(*ev); + struct iscsi_cls_conn *conn; + struct iscsi_cls_session *session; + int err = 0; + uint32_t value = 0; + + session = iscsi_session_lookup(ev->u.set_param.sid); + conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); + if (!conn || !session) + return -EINVAL; + + switch (ev->u.set_param.param) { + case ISCSI_PARAM_SESS_RECOVERY_TMO: + iscsi_copy_param(ev, &value, data); + if (value != 0) + session->recovery_tmo = value; + break; + case ISCSI_PARAM_TARGET_NAME: + /* this should not change between logins */ + if (session->targetname) + return 0; + + session->targetname = kstrdup(data, GFP_KERNEL); + if (!session->targetname) + return -ENOMEM; + break; + case ISCSI_PARAM_TPGT: + iscsi_copy_param(ev, &value, data); + session->tpgt = value; + break; + case ISCSI_PARAM_PERSISTENT_PORT: + iscsi_copy_param(ev, &value, data); + conn->persistent_port = value; + break; + case ISCSI_PARAM_PERSISTENT_ADDRESS: + /* + * this is the address returned in discovery so it should + * not change between logins. + */ + if (conn->persistent_address) + return 0; + + conn->persistent_address = kstrdup(data, GFP_KERNEL); + if (!conn->persistent_address) + return -ENOMEM; + break; + default: + iscsi_copy_param(ev, &value, data); + err = transport->set_param(conn, ev->u.set_param.param, value); + } + + return err; +} + static int iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) { @@ -841,6 +937,7 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) struct iscsi_internal *priv; struct iscsi_cls_session *session; struct iscsi_cls_conn *conn; + unsigned long flags; priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); if (!priv) @@ -855,10 +952,14 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) err = iscsi_if_create_session(priv, ev); break; case ISCSI_UEVENT_DESTROY_SESSION: - session = iscsi_session_lookup(ev->u.d_session.session_handle); - if (session) + session = iscsi_session_lookup(ev->u.d_session.sid); + if (session) { + spin_lock_irqsave(&sesslock, flags); + list_del(&session->sess_list); + spin_unlock_irqrestore(&sesslock, flags); + transport->destroy_session(session); - else + } else err = -EINVAL; break; case ISCSI_UEVENT_CREATE_CONN: @@ -868,8 +969,8 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) err = iscsi_if_destroy_conn(transport, ev); break; case ISCSI_UEVENT_BIND_CONN: - session = iscsi_session_lookup(ev->u.b_conn.session_handle); - conn = iscsi_conn_lookup(ev->u.b_conn.conn_handle); + session = iscsi_session_lookup(ev->u.b_conn.sid); + conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); if (session && conn) ev->r.retcode = transport->bind_conn(session, conn, @@ -879,30 +980,24 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) err = -EINVAL; break; case ISCSI_UEVENT_SET_PARAM: - conn = iscsi_conn_lookup(ev->u.set_param.conn_handle); - if (conn) - ev->r.retcode = transport->set_param(conn, - ev->u.set_param.param, ev->u.set_param.value); - else - err = -EINVAL; + err = iscsi_set_param(transport, ev); break; case ISCSI_UEVENT_START_CONN: - conn = iscsi_conn_lookup(ev->u.start_conn.conn_handle); + conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); if (conn) ev->r.retcode = transport->start_conn(conn); else err = -EINVAL; - break; case ISCSI_UEVENT_STOP_CONN: - conn = iscsi_conn_lookup(ev->u.stop_conn.conn_handle); + conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); if (conn) transport->stop_conn(conn, ev->u.stop_conn.flag); else err = -EINVAL; break; case ISCSI_UEVENT_SEND_PDU: - conn = iscsi_conn_lookup(ev->u.send_pdu.conn_handle); + conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); if (conn) ev->r.retcode = transport->send_pdu(conn, (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), @@ -923,9 +1018,11 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) return err; } -/* Get message from skb (based on rtnetlink_rcv_skb). Each message is - * processed by iscsi_if_recv_msg. Malformed skbs with wrong length are - * or invalid creds discarded silently. */ +/* + * Get message from skb (based on rtnetlink_rcv_skb). Each message is + * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or + * invalid creds are discarded silently. + */ static void iscsi_if_rx(struct sock *sk, int len) { @@ -988,6 +1085,10 @@ free_skb: #define iscsi_cdev_to_conn(_cdev) \ iscsi_dev_to_conn(_cdev->dev) +#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ +struct class_device_attribute class_device_attr_##_prefix##_##_name = \ + __ATTR(_name,_mode,_show,_store) + /* * iSCSI connection attrs */ @@ -1005,7 +1106,8 @@ show_conn_int_param_##param(struct class_device *cdev, char *buf) \ #define iscsi_conn_int_attr(field, param, format) \ iscsi_conn_int_attr_show(param, format) \ -static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL); +static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_int_param_##param, \ + NULL); iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u"); iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u"); @@ -1013,6 +1115,25 @@ iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d"); iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d"); iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d"); iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d"); +iscsi_conn_int_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT, "%d"); +iscsi_conn_int_attr(port, ISCSI_PARAM_CONN_PORT, "%d"); + +#define iscsi_conn_str_attr_show(param) \ +static ssize_t \ +show_conn_str_param_##param(struct class_device *cdev, char *buf) \ +{ \ + struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ + struct iscsi_transport *t = conn->transport; \ + return t->get_conn_str_param(conn, param, buf); \ +} + +#define iscsi_conn_str_attr(field, param) \ + iscsi_conn_str_attr_show(param) \ +static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_str_param_##param, \ + NULL); + +iscsi_conn_str_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); +iscsi_conn_str_attr(address, ISCSI_PARAM_CONN_ADDRESS); #define iscsi_cdev_to_session(_cdev) \ iscsi_dev_to_session(_cdev->dev) @@ -1034,7 +1155,8 @@ show_session_int_param_##param(struct class_device *cdev, char *buf) \ #define iscsi_session_int_attr(field, param, format) \ iscsi_session_int_attr_show(param, format) \ -static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL); +static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_int_param_##param, \ + NULL); iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d"); iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu"); @@ -1044,18 +1166,89 @@ iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u"); iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d"); iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d"); iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d"); +iscsi_session_int_attr(tpgt, ISCSI_PARAM_TPGT, "%d"); -#define SETUP_SESSION_RD_ATTR(field, param) \ - if (priv->param_mask & (1 << param)) { \ - priv->session_attrs[count] = &class_device_attr_##field;\ - count++; \ - } +#define iscsi_session_str_attr_show(param) \ +static ssize_t \ +show_session_str_param_##param(struct class_device *cdev, char *buf) \ +{ \ + struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ + struct iscsi_transport *t = session->transport; \ + return t->get_session_str_param(session, param, buf); \ +} + +#define iscsi_session_str_attr(field, param) \ + iscsi_session_str_attr_show(param) \ +static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_str_param_##param, \ + NULL); + +iscsi_session_str_attr(targetname, ISCSI_PARAM_TARGET_NAME); + +/* + * Private session and conn attrs. userspace uses several iscsi values + * to identify each session between reboots. Some of these values may not + * be present in the iscsi_transport/LLD driver becuase userspace handles + * login (and failback for login redirect) so for these type of drivers + * the class manages the attrs and values for the iscsi_transport/LLD + */ +#define iscsi_priv_session_attr_show(field, format) \ +static ssize_t \ +show_priv_session_##field(struct class_device *cdev, char *buf) \ +{ \ + struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ + return sprintf(buf, format"\n", session->field); \ +} + +#define iscsi_priv_session_attr(field, format) \ + iscsi_priv_session_attr_show(field, format) \ +static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ + NULL) +iscsi_priv_session_attr(targetname, "%s"); +iscsi_priv_session_attr(tpgt, "%d"); +iscsi_priv_session_attr(recovery_tmo, "%d"); + +#define iscsi_priv_conn_attr_show(field, format) \ +static ssize_t \ +show_priv_conn_##field(struct class_device *cdev, char *buf) \ +{ \ + struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ + return sprintf(buf, format"\n", conn->field); \ +} -#define SETUP_CONN_RD_ATTR(field, param) \ - if (priv->param_mask & (1 << param)) { \ - priv->conn_attrs[count] = &class_device_attr_##field; \ +#define iscsi_priv_conn_attr(field, format) \ + iscsi_priv_conn_attr_show(field, format) \ +static ISCSI_CLASS_ATTR(priv_conn, field, S_IRUGO, show_priv_conn_##field, \ + NULL) +iscsi_priv_conn_attr(persistent_address, "%s"); +iscsi_priv_conn_attr(persistent_port, "%d"); + +#define SETUP_PRIV_SESSION_RD_ATTR(field) \ +do { \ + priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \ + count++; \ +} while (0) + +#define SETUP_SESSION_RD_ATTR(field, param_flag) \ +do { \ + if (tt->param_mask & param_flag) { \ + priv->session_attrs[count] = &class_device_attr_sess_##field; \ count++; \ - } + } \ +} while (0) + +#define SETUP_PRIV_CONN_RD_ATTR(field) \ +do { \ + priv->conn_attrs[count] = &class_device_attr_priv_conn_##field; \ + count++; \ +} while (0) + +#define SETUP_CONN_RD_ATTR(field, param_flag) \ +do { \ + if (tt->param_mask & param_flag) { \ + priv->conn_attrs[count] = &class_device_attr_conn_##field; \ + count++; \ + } \ +} while (0) static int iscsi_session_match(struct attribute_container *cont, struct device *dev) @@ -1104,6 +1297,24 @@ static int iscsi_conn_match(struct attribute_container *cont, return &priv->conn_cont.ac == cont; } +static int iscsi_host_match(struct attribute_container *cont, + struct device *dev) +{ + struct Scsi_Host *shost; + struct iscsi_internal *priv; + + if (!scsi_is_host_device(dev)) + return 0; + + shost = dev_to_shost(dev); + if (!shost->transportt || + shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) + return 0; + + priv = to_iscsi_internal(shost->transportt); + return &priv->t.host_attrs.ac == cont; +} + struct scsi_transport_template * iscsi_register_transport(struct iscsi_transport *tt) { @@ -1122,6 +1333,7 @@ iscsi_register_transport(struct iscsi_transport *tt) return NULL; INIT_LIST_HEAD(&priv->list); priv->iscsi_transport = tt; + priv->t.user_scan = iscsi_user_scan; priv->cdev.class = &iscsi_transport_class; snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); @@ -1133,18 +1345,13 @@ iscsi_register_transport(struct iscsi_transport *tt) if (err) goto unregister_cdev; - /* setup parameters mask */ - priv->param_mask = 0xFFFFFFFF; - if (!(tt->caps & CAP_MULTI_R2T)) - priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T); - if (!(tt->caps & CAP_HDRDGST)) - priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN); - if (!(tt->caps & CAP_DATADGST)) - priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN); - if (!(tt->caps & CAP_MARKERS)) { - priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN); - priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN); - } + /* host parameters */ + priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; + priv->t.host_attrs.ac.class = &iscsi_host_class.class; + priv->t.host_attrs.ac.match = iscsi_host_match; + priv->t.host_size = sizeof(struct iscsi_host); + priv->host_attrs[0] = NULL; + transport_container_register(&priv->t.host_attrs); /* connection parameters */ priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; @@ -1152,12 +1359,24 @@ iscsi_register_transport(struct iscsi_transport *tt) priv->conn_cont.ac.match = iscsi_conn_match; transport_container_register(&priv->conn_cont); - SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); - SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); - SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN); - SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN); - SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN); - SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN); + SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); + SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); + SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); + SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); + SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); + SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); + SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); + SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); + + if (tt->param_mask & ISCSI_PERSISTENT_ADDRESS) + SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); + else + SETUP_PRIV_CONN_RD_ATTR(persistent_address); + + if (tt->param_mask & ISCSI_PERSISTENT_PORT) + SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); + else + SETUP_PRIV_CONN_RD_ATTR(persistent_port); BUG_ON(count > ISCSI_CONN_ATTRS); priv->conn_attrs[count] = NULL; @@ -1169,14 +1388,25 @@ iscsi_register_transport(struct iscsi_transport *tt) priv->session_cont.ac.match = iscsi_session_match; transport_container_register(&priv->session_cont); - SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN); - SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T); - SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN); - SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST); - SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST); - SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN); - SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN) - SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL); + SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); + SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); + SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); + SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); + SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); + SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); + SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); + SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); + SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); + + if (tt->param_mask & ISCSI_TARGET_NAME) + SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); + else + SETUP_PRIV_SESSION_RD_ATTR(targetname); + + if (tt->param_mask & ISCSI_TPGT) + SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); + else + SETUP_PRIV_SESSION_RD_ATTR(tpgt); BUG_ON(count > ISCSI_SESSION_ATTRS); priv->session_attrs[count] = NULL; @@ -1214,6 +1444,7 @@ int iscsi_unregister_transport(struct iscsi_transport *tt) transport_container_unregister(&priv->conn_cont); transport_container_unregister(&priv->session_cont); + transport_container_unregister(&priv->t.host_attrs); sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); class_device_unregister(&priv->cdev); @@ -1257,10 +1488,14 @@ static __init int iscsi_transport_init(void) if (err) return err; - err = transport_class_register(&iscsi_connection_class); + err = transport_class_register(&iscsi_host_class); if (err) goto unregister_transport_class; + err = transport_class_register(&iscsi_connection_class); + if (err) + goto unregister_host_class; + err = transport_class_register(&iscsi_session_class); if (err) goto unregister_conn_class; @@ -1288,6 +1523,8 @@ unregister_session_class: transport_class_unregister(&iscsi_session_class); unregister_conn_class: transport_class_unregister(&iscsi_connection_class); +unregister_host_class: + transport_class_unregister(&iscsi_host_class); unregister_transport_class: class_unregister(&iscsi_transport_class); return err; @@ -1300,6 +1537,7 @@ static void __exit iscsi_transport_exit(void) netlink_unregister_notifier(&iscsi_nl_notifier); transport_class_unregister(&iscsi_connection_class); transport_class_unregister(&iscsi_session_class); + transport_class_unregister(&iscsi_host_class); class_unregister(&iscsi_transport_class); } diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h index e5618b90996..47524c726ee 100644 --- a/include/scsi/iscsi_if.h +++ b/include/scsi/iscsi_if.h @@ -60,59 +60,68 @@ struct iscsi_uevent { uint32_t initial_cmdsn; } c_session; struct msg_destroy_session { - uint64_t session_handle; uint32_t sid; } d_session; struct msg_create_conn { - uint64_t session_handle; - uint32_t cid; uint32_t sid; + uint32_t cid; } c_conn; struct msg_bind_conn { - uint64_t session_handle; - uint64_t conn_handle; + uint32_t sid; + uint32_t cid; uint32_t transport_fd; uint32_t is_leading; } b_conn; struct msg_destroy_conn { - uint64_t conn_handle; + uint32_t sid; uint32_t cid; } d_conn; struct msg_send_pdu { + uint32_t sid; + uint32_t cid; uint32_t hdr_size; uint32_t data_size; - uint64_t conn_handle; } send_pdu; struct msg_set_param { - uint64_t conn_handle; + uint32_t sid; + uint32_t cid; uint32_t param; /* enum iscsi_param */ - uint32_t value; + uint32_t len; } set_param; struct msg_start_conn { - uint64_t conn_handle; + uint32_t sid; + uint32_t cid; } start_conn; struct msg_stop_conn { + uint32_t sid; + uint32_t cid; uint64_t conn_handle; uint32_t flag; } stop_conn; struct msg_get_stats { - uint64_t conn_handle; + uint32_t sid; + uint32_t cid; } get_stats; } u; union { /* messages k -> u */ - uint64_t handle; int retcode; struct msg_create_session_ret { - uint64_t session_handle; uint32_t sid; + uint32_t host_no; } c_session_ret; + struct msg_create_conn_ret { + uint32_t sid; + uint32_t cid; + } c_conn_ret; struct msg_recv_req { + uint32_t sid; + uint32_t cid; uint64_t recv_handle; - uint64_t conn_handle; } recv_req; struct msg_conn_error { - uint64_t conn_handle; + uint32_t sid; + uint32_t cid; uint32_t error; /* enum iscsi_err */ } connerror; } r; @@ -139,29 +148,64 @@ enum iscsi_err { ISCSI_ERR_SESSION_FAILED = ISCSI_ERR_BASE + 13, ISCSI_ERR_HDR_DGST = ISCSI_ERR_BASE + 14, ISCSI_ERR_DATA_DGST = ISCSI_ERR_BASE + 15, - ISCSI_ERR_PARAM_NOT_FOUND = ISCSI_ERR_BASE + 16 + ISCSI_ERR_PARAM_NOT_FOUND = ISCSI_ERR_BASE + 16, + ISCSI_ERR_NO_SCSI_CMD = ISCSI_ERR_BASE + 17, }; /* * iSCSI Parameters (RFC3720) */ enum iscsi_param { - ISCSI_PARAM_MAX_RECV_DLENGTH = 0, - ISCSI_PARAM_MAX_XMIT_DLENGTH = 1, - ISCSI_PARAM_HDRDGST_EN = 2, - ISCSI_PARAM_DATADGST_EN = 3, - ISCSI_PARAM_INITIAL_R2T_EN = 4, - ISCSI_PARAM_MAX_R2T = 5, - ISCSI_PARAM_IMM_DATA_EN = 6, - ISCSI_PARAM_FIRST_BURST = 7, - ISCSI_PARAM_MAX_BURST = 8, - ISCSI_PARAM_PDU_INORDER_EN = 9, - ISCSI_PARAM_DATASEQ_INORDER_EN = 10, - ISCSI_PARAM_ERL = 11, - ISCSI_PARAM_IFMARKER_EN = 12, - ISCSI_PARAM_OFMARKER_EN = 13, + /* passed in using netlink set param */ + ISCSI_PARAM_MAX_RECV_DLENGTH, + ISCSI_PARAM_MAX_XMIT_DLENGTH, + ISCSI_PARAM_HDRDGST_EN, + ISCSI_PARAM_DATADGST_EN, + ISCSI_PARAM_INITIAL_R2T_EN, + ISCSI_PARAM_MAX_R2T, + ISCSI_PARAM_IMM_DATA_EN, + ISCSI_PARAM_FIRST_BURST, + ISCSI_PARAM_MAX_BURST, + ISCSI_PARAM_PDU_INORDER_EN, + ISCSI_PARAM_DATASEQ_INORDER_EN, + ISCSI_PARAM_ERL, + ISCSI_PARAM_IFMARKER_EN, + ISCSI_PARAM_OFMARKER_EN, + ISCSI_PARAM_TARGET_NAME, + ISCSI_PARAM_TPGT, + ISCSI_PARAM_PERSISTENT_ADDRESS, + ISCSI_PARAM_PERSISTENT_PORT, + ISCSI_PARAM_SESS_RECOVERY_TMO, + + /* pased in through bind conn using transport_fd */ + ISCSI_PARAM_CONN_PORT, + ISCSI_PARAM_CONN_ADDRESS, + + /* must always be last */ + ISCSI_PARAM_MAX, }; -#define ISCSI_PARAM_MAX 14 + +#define ISCSI_MAX_RECV_DLENGTH (1 << ISCSI_PARAM_MAX_RECV_DLENGTH) +#define ISCSI_MAX_XMIT_DLENGTH (1 << ISCSI_PARAM_MAX_XMIT_DLENGTH) +#define ISCSI_HDRDGST_EN (1 << ISCSI_PARAM_HDRDGST_EN) +#define ISCSI_DATADGST_EN (1 << ISCSI_PARAM_DATADGST_EN) +#define ISCSI_INITIAL_R2T_EN (1 << ISCSI_PARAM_INITIAL_R2T_EN) +#define ISCSI_MAX_R2T (1 << ISCSI_PARAM_MAX_R2T) +#define ISCSI_IMM_DATA_EN (1 << ISCSI_PARAM_IMM_DATA_EN) +#define ISCSI_FIRST_BURST (1 << ISCSI_PARAM_FIRST_BURST) +#define ISCSI_MAX_BURST (1 << ISCSI_PARAM_MAX_BURST) +#define ISCSI_PDU_INORDER_EN (1 << ISCSI_PARAM_PDU_INORDER_EN) +#define ISCSI_DATASEQ_INORDER_EN (1 << ISCSI_PARAM_DATASEQ_INORDER_EN) +#define ISCSI_ERL (1 << ISCSI_PARAM_ERL) +#define ISCSI_IFMARKER_EN (1 << ISCSI_PARAM_IFMARKER_EN) +#define ISCSI_OFMARKER_EN (1 << ISCSI_PARAM_OFMARKER_EN) +#define ISCSI_TARGET_NAME (1 << ISCSI_PARAM_TARGET_NAME) +#define ISCSI_TPGT (1 << ISCSI_PARAM_TPGT) +#define ISCSI_PERSISTENT_ADDRESS (1 << ISCSI_PARAM_PERSISTENT_ADDRESS) +#define ISCSI_PERSISTENT_PORT (1 << ISCSI_PARAM_PERSISTENT_PORT) +#define ISCSI_SESS_RECOVERY_TMO (1 << ISCSI_PARAM_SESS_RECOVERY_TMO) +#define ISCSI_CONN_PORT (1 << ISCSI_PARAM_CONN_PORT) +#define ISCSI_CONN_ADDRESS (1 << ISCSI_PARAM_CONN_ADDRESS) #define iscsi_ptr(_handle) ((void*)(unsigned long)_handle) #define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr) diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h new file mode 100644 index 00000000000..830700a4ed6 --- /dev/null +++ b/include/scsi/libiscsi.h @@ -0,0 +1,286 @@ +/* + * iSCSI lib definitions + * + * Copyright (C) 2006 Red Hat, Inc. All rights reserved. + * Copyright (C) 2004 - 2006 Mike Christie + * Copyright (C) 2004 - 2005 Dmitry Yusupov + * Copyright (C) 2004 - 2005 Alex Aizman + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ +#ifndef LIBISCSI_H +#define LIBISCSI_H + +#include <linux/types.h> +#include <linux/mutex.h> +#include <scsi/iscsi_proto.h> +#include <scsi/iscsi_if.h> + +struct scsi_transport_template; +struct scsi_device; +struct Scsi_Host; +struct scsi_cmnd; +struct socket; +struct iscsi_transport; +struct iscsi_cls_session; +struct iscsi_cls_conn; +struct iscsi_session; +struct iscsi_nopin; + +/* #define DEBUG_SCSI */ +#ifdef DEBUG_SCSI +#define debug_scsi(fmt...) printk(KERN_INFO "scsi: " fmt) +#else +#define debug_scsi(fmt...) +#endif + +#define ISCSI_XMIT_CMDS_MAX 128 /* must be power of 2 */ +#define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */ +#define ISCSI_CONN_MAX 1 + +#define ISCSI_MGMT_ITT_OFFSET 0xa00 + +#define ISCSI_DEF_CMD_PER_LUN 32 +#define ISCSI_MAX_CMD_PER_LUN 128 + +/* Task Mgmt states */ +#define TMABORT_INITIAL 0x0 +#define TMABORT_SUCCESS 0x1 +#define TMABORT_FAILED 0x2 +#define TMABORT_TIMEDOUT 0x3 + +/* Connection suspend "bit" */ +#define ISCSI_SUSPEND_BIT 1 + +#define ISCSI_ITT_MASK (0xfff) +#define ISCSI_CID_SHIFT 12 +#define ISCSI_CID_MASK (0xffff << ISCSI_CID_SHIFT) +#define ISCSI_AGE_SHIFT 28 +#define ISCSI_AGE_MASK (0xf << ISCSI_AGE_SHIFT) + +struct iscsi_mgmt_task { + /* + * Becuae LLDs allocate their hdr differently, this is a pointer to + * that storage. It must be setup at session creation time. + */ + struct iscsi_hdr *hdr; + char *data; /* mgmt payload */ + int data_count; /* counts data to be sent */ + uint32_t itt; /* this ITT */ + void *dd_data; /* driver/transport data */ + struct list_head running; +}; + +struct iscsi_cmd_task { + /* + * Becuae LLDs allocate their hdr differently, this is a pointer to + * that storage. It must be setup at session creation time. + */ + struct iscsi_cmd *hdr; + int itt; /* this ITT */ + int datasn; /* DataSN */ + + uint32_t unsol_datasn; + int imm_count; /* imm-data (bytes) */ + int unsol_count; /* unsolicited (bytes)*/ + int data_count; /* remaining Data-Out */ + struct scsi_cmnd *sc; /* associated SCSI cmd*/ + int total_length; + struct iscsi_conn *conn; /* used connection */ + struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */ + + struct list_head running; /* running cmd list */ + void *dd_data; /* driver/transport data */ +}; + +struct iscsi_conn { + struct iscsi_cls_conn *cls_conn; /* ptr to class connection */ + void *dd_data; /* iscsi_transport data */ + struct iscsi_session *session; /* parent session */ + /* + * LLDs should set this lock. It protects the transport recv + * code + */ + rwlock_t *recv_lock; + /* + * conn_stop() flag: stop to recover, stop to terminate + */ + int stop_stage; + + /* iSCSI connection-wide sequencing */ + uint32_t exp_statsn; + + /* control data */ + int id; /* CID */ + struct list_head item; /* maintains list of conns */ + int c_stage; /* connection state */ + struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */ + struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */ + struct iscsi_cmd_task *ctask; /* xmit ctask in progress */ + + /* xmit */ + struct kfifo *immqueue; /* immediate xmit queue */ + struct kfifo *mgmtqueue; /* mgmt (control) xmit queue */ + struct list_head mgmt_run_list; /* list of control tasks */ + struct kfifo *xmitqueue; /* data-path cmd queue */ + struct list_head run_list; /* list of cmds in progress */ + struct work_struct xmitwork; /* per-conn. xmit workqueue */ + /* + * serializes connection xmit, access to kfifos: + * xmitqueue, immqueue, mgmtqueue + */ + struct mutex xmitmutex; + + unsigned long suspend_tx; /* suspend Tx */ + unsigned long suspend_rx; /* suspend Rx */ + + /* abort */ + wait_queue_head_t ehwait; /* used in eh_abort() */ + struct iscsi_tm tmhdr; + struct timer_list tmabort_timer; + int tmabort_state; /* see TMABORT_INITIAL, etc.*/ + + /* negotiated params */ + int max_recv_dlength; /* initiator_max_recv_dsl*/ + int max_xmit_dlength; /* target_max_recv_dsl */ + int hdrdgst_en; + int datadgst_en; + + /* MIB-statistics */ + uint64_t txdata_octets; + uint64_t rxdata_octets; + uint32_t scsicmd_pdus_cnt; + uint32_t dataout_pdus_cnt; + uint32_t scsirsp_pdus_cnt; + uint32_t datain_pdus_cnt; + uint32_t r2t_pdus_cnt; + uint32_t tmfcmd_pdus_cnt; + int32_t tmfrsp_pdus_cnt; + + /* custom statistics */ + uint32_t eh_abort_cnt; +}; + +struct iscsi_queue { + struct kfifo *queue; /* FIFO Queue */ + void **pool; /* Pool of elements */ + int max; /* Max number of elements */ +}; + +struct iscsi_session { + /* iSCSI session-wide sequencing */ + uint32_t cmdsn; + uint32_t exp_cmdsn; + uint32_t max_cmdsn; + + /* configuration */ + int initial_r2t_en; + int max_r2t; + int imm_data_en; + int first_burst; + int max_burst; + int time2wait; + int time2retain; + int pdu_inorder_en; + int dataseq_inorder_en; + int erl; + int ifmarker_en; + int ofmarker_en; + + /* control data */ + struct iscsi_transport *tt; + struct Scsi_Host *host; + struct iscsi_conn *leadconn; /* leading connection */ + spinlock_t lock; /* protects session state, * + * sequence numbers, * + * session resources: * + * - cmdpool, * + * - mgmtpool, * + * - r2tpool */ + int state; /* session state */ + int recovery_failed; + struct list_head item; + int conn_cnt; + int age; /* counts session re-opens */ + + struct list_head connections; /* list of connections */ + int cmds_max; /* size of cmds array */ + struct iscsi_cmd_task **cmds; /* Original Cmds arr */ + struct iscsi_queue cmdpool; /* PDU's pool */ + int mgmtpool_max; /* size of mgmt array */ + struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */ + struct iscsi_queue mgmtpool; /* Mgmt PDU's pool */ +}; + +/* + * scsi host template + */ +extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth); +extern int iscsi_eh_abort(struct scsi_cmnd *sc); +extern int iscsi_eh_host_reset(struct scsi_cmnd *sc); +extern int iscsi_queuecommand(struct scsi_cmnd *sc, + void (*done)(struct scsi_cmnd *)); + +/* + * session management + */ +extern struct iscsi_cls_session * +iscsi_session_setup(struct iscsi_transport *, struct scsi_transport_template *, + int, int, uint32_t, uint32_t *); +extern void iscsi_session_teardown(struct iscsi_cls_session *); +extern struct iscsi_session *class_to_transport_session(struct iscsi_cls_session *); +extern void iscsi_start_session_recovery(struct iscsi_session *, + struct iscsi_conn *, int); +extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *); + +#define session_to_cls(_sess) \ + hostdata_session(_sess->host->hostdata) + +/* + * connection management + */ +extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *, + uint32_t); +extern void iscsi_conn_teardown(struct iscsi_cls_conn *); +extern int iscsi_conn_start(struct iscsi_cls_conn *); +extern void iscsi_conn_stop(struct iscsi_cls_conn *, int); +extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *, + int); +extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err); + +/* + * pdu and task processing + */ +extern int iscsi_check_assign_cmdsn(struct iscsi_session *, + struct iscsi_nopin *); +extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *, + struct iscsi_data *hdr, + int transport_data_cnt); +extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *, + char *, uint32_t); +extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, + char *, int); +extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, + char *, int); +extern int iscsi_verify_itt(struct iscsi_conn *, struct iscsi_hdr *, + uint32_t *); + +/* + * generic helpers + */ +extern void iscsi_pool_free(struct iscsi_queue *, void **); +extern int iscsi_pool_init(struct iscsi_queue *, int, void ***, int); + +#endif diff --git a/include/scsi/scsi_devinfo.h b/include/scsi/scsi_devinfo.h index d31b16d25a0..b4ddd3b18b4 100644 --- a/include/scsi/scsi_devinfo.h +++ b/include/scsi/scsi_devinfo.h @@ -29,4 +29,5 @@ #define BLIST_SELECT_NO_ATN 0x200000 /* select without ATN */ #define BLIST_RETRY_HWERROR 0x400000 /* retry HARDWARE_ERROR */ #define BLIST_MAX_512 0x800000 /* maximum 512 sector cdb length */ +#define BLIST_ATTACH_PQ3 0x1000000 /* Scan: Attach to PQ3 devices */ #endif diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h index b41cf077e54..b332d6e839f 100644 --- a/include/scsi/scsi_transport_iscsi.h +++ b/include/scsi/scsi_transport_iscsi.h @@ -2,7 +2,7 @@ * iSCSI transport class definitions * * Copyright (C) IBM Corporation, 2004 - * Copyright (C) Mike Christie, 2004 - 2005 + * Copyright (C) Mike Christie, 2004 - 2006 * Copyright (C) Dmitry Yusupov, 2004 - 2005 * Copyright (C) Alex Aizman, 2004 - 2005 * @@ -27,9 +27,13 @@ #include <scsi/iscsi_if.h> struct scsi_transport_template; +struct iscsi_transport; struct Scsi_Host; struct mempool_zone; struct iscsi_cls_conn; +struct iscsi_conn; +struct iscsi_cmd_task; +struct iscsi_mgmt_task; /** * struct iscsi_transport - iSCSI Transport template @@ -46,6 +50,20 @@ struct iscsi_cls_conn; * @start_conn: set connection to be operational * @stop_conn: suspend/recover/terminate connection * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text. + * @session_recovery_timedout: notify LLD a block during recovery timed out + * @suspend_conn_recv: susepend the recv side of the connection + * @termincate_conn: destroy socket connection. Called with mutex lock. + * @init_cmd_task: Initialize a iscsi_cmd_task and any internal structs. + * Called from queuecommand with session lock held. + * @init_mgmt_task: Initialize a iscsi_mgmt_task and any internal structs. + * Called from iscsi_conn_send_generic with xmitmutex. + * @xmit_cmd_task: requests LLD to transfer cmd task + * @xmit_mgmt_task: requests LLD to transfer mgmt task + * @cleanup_cmd_task: requests LLD to fail cmd task. Called with xmitmutex + * and session->lock after the connection has been + * suspended and terminated during recovery. If called + * from abort task then connection is not suspended + * or terminated but sk_callback_lock is held * * Template API provided by iSCSI Transport */ @@ -53,18 +71,18 @@ struct iscsi_transport { struct module *owner; char *name; unsigned int caps; + /* LLD sets this to indicate what values it can export to sysfs */ + unsigned int param_mask; struct scsi_host_template *host_template; - /* LLD session/scsi_host data size */ - int hostdata_size; - /* LLD iscsi_host data size */ - int ihostdata_size; /* LLD connection data size */ int conndata_size; + /* LLD session data size */ + int sessiondata_size; int max_lun; unsigned int max_conn; unsigned int max_cmd_len; - struct iscsi_cls_session *(*create_session) - (struct scsi_transport_template *t, uint32_t sn, uint32_t *sid); + struct iscsi_cls_session *(*create_session) (struct iscsi_transport *it, + struct scsi_transport_template *t, uint32_t sn, uint32_t *hn); void (*destroy_session) (struct iscsi_cls_session *session); struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess, uint32_t cid); @@ -77,14 +95,30 @@ struct iscsi_transport { int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, uint32_t value); int (*get_conn_param) (struct iscsi_cls_conn *conn, - enum iscsi_param param, - uint32_t *value); + enum iscsi_param param, uint32_t *value); int (*get_session_param) (struct iscsi_cls_session *session, enum iscsi_param param, uint32_t *value); + int (*get_conn_str_param) (struct iscsi_cls_conn *conn, + enum iscsi_param param, char *buf); + int (*get_session_str_param) (struct iscsi_cls_session *session, + enum iscsi_param param, char *buf); int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, char *data, uint32_t data_size); void (*get_stats) (struct iscsi_cls_conn *conn, struct iscsi_stats *stats); + void (*suspend_conn_recv) (struct iscsi_conn *conn); + void (*terminate_conn) (struct iscsi_conn *conn); + void (*init_cmd_task) (struct iscsi_cmd_task *ctask); + void (*init_mgmt_task) (struct iscsi_conn *conn, + struct iscsi_mgmt_task *mtask, + char *data, uint32_t data_size); + int (*xmit_cmd_task) (struct iscsi_conn *conn, + struct iscsi_cmd_task *ctask); + void (*cleanup_cmd_task) (struct iscsi_conn *conn, + struct iscsi_cmd_task *ctask); + int (*xmit_mgmt_task) (struct iscsi_conn *conn, + struct iscsi_mgmt_task *mtask); + void (*session_recovery_timedout) (struct iscsi_cls_session *session); }; /* @@ -100,10 +134,26 @@ extern void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error); extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, char *data, uint32_t data_size); + +/* Connection's states */ +#define ISCSI_CONN_INITIAL_STAGE 0 +#define ISCSI_CONN_STARTED 1 +#define ISCSI_CONN_STOPPED 2 +#define ISCSI_CONN_CLEANUP_WAIT 3 + struct iscsi_cls_conn { struct list_head conn_list; /* item in connlist */ void *dd_data; /* LLD private data */ struct iscsi_transport *transport; + uint32_t cid; /* connection id */ + + /* portal/group values we got during discovery */ + char *persistent_address; + int persistent_port; + /* portal/group values we are currently using */ + char *address; + int port; + int active; /* must be accessed with the connlock */ struct device dev; /* sysfs transport/container device */ struct mempool_zone *z_error; @@ -114,9 +164,30 @@ struct iscsi_cls_conn { #define iscsi_dev_to_conn(_dev) \ container_of(_dev, struct iscsi_cls_conn, dev) +/* Session's states */ +#define ISCSI_STATE_FREE 1 +#define ISCSI_STATE_LOGGED_IN 2 +#define ISCSI_STATE_FAILED 3 +#define ISCSI_STATE_TERMINATE 4 + struct iscsi_cls_session { struct list_head sess_list; /* item in session_list */ + struct list_head host_list; struct iscsi_transport *transport; + + /* iSCSI values used as unique id by userspace. */ + char *targetname; + int tpgt; + + /* recovery fields */ + int recovery_tmo; + struct work_struct recovery_work; + + int target_id; + int channel; + + int sid; /* session id */ + void *dd_data; /* LLD private data */ struct device dev; /* sysfs transport/container device */ }; @@ -126,22 +197,22 @@ struct iscsi_cls_session { #define iscsi_session_to_shost(_session) \ dev_to_shost(_session->dev.parent) +struct iscsi_host { + int next_target_id; + struct list_head sessions; + struct mutex mutex; +}; + /* * session and connection functions that can be used by HW iSCSI LLDs */ extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, - struct iscsi_transport *t); + struct iscsi_transport *t, int channel); extern int iscsi_destroy_session(struct iscsi_cls_session *session); extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, uint32_t cid); extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); - -/* - * session functions used by software iscsi - */ -extern struct Scsi_Host * -iscsi_transport_create_session(struct scsi_transport_template *scsit, - struct iscsi_transport *transport); -extern int iscsi_transport_destroy_session(struct Scsi_Host *shost); +extern void iscsi_unblock_session(struct iscsi_cls_session *session); +extern void iscsi_block_session(struct iscsi_cls_session *session); #endif |