From c07d444407de63b2f414a8be9428f88cadba503f Mon Sep 17 00:00:00 2001 From: Boaz Harrosh Date: Fri, 18 Apr 2008 10:11:52 -0500 Subject: [SCSI] iscsi: bidi support at the generic libiscsi level - prepare the additional bidi_read rlength header. - access the right scsi_in() and/or scsi_out() side of things. also for resid. - Handle BIDI underflow overflow from target Signed-off-by: Boaz Harrosh Reviewed-by: Pete Wyckoff Signed-off-by: Mike Christie Signed-off-by: James Bottomley --- drivers/scsi/libiscsi.c | 85 ++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 70 insertions(+), 15 deletions(-) diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index 2f6b0955ff0..010c1b9b178 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -176,6 +176,31 @@ static int iscsi_prep_ecdb_ahs(struct iscsi_cmd_task *ctask) return 0; } +static int iscsi_prep_bidi_ahs(struct iscsi_cmd_task *ctask) +{ + struct scsi_cmnd *sc = ctask->sc; + struct iscsi_rlength_ahdr *rlen_ahdr; + int rc; + + rlen_ahdr = iscsi_next_hdr(ctask); + rc = iscsi_add_hdr(ctask, sizeof(*rlen_ahdr)); + if (rc) + return rc; + + rlen_ahdr->ahslength = + cpu_to_be16(sizeof(rlen_ahdr->read_length) + + sizeof(rlen_ahdr->reserved)); + rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; + rlen_ahdr->reserved = 0; + rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); + + debug_scsi("bidi-in rlen_ahdr->read_length(%d) " + "rlen_ahdr->ahslength(%d)\n", + be32_to_cpu(rlen_ahdr->read_length), + be16_to_cpu(rlen_ahdr->ahslength)); + return 0; +} + /** * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu * @ctask: iscsi cmd task @@ -200,7 +225,6 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) hdr->flags = ISCSI_ATTR_SIMPLE; int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); hdr->itt = build_itt(ctask->itt, session->age); - hdr->data_length = cpu_to_be32(scsi_bufflen(sc)); hdr->cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++; hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); @@ -216,7 +240,15 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) memcpy(hdr->cdb, sc->cmnd, cmd_len); ctask->imm_count = 0; + if (scsi_bidi_cmnd(sc)) { + hdr->flags |= ISCSI_FLAG_CMD_READ; + rc = iscsi_prep_bidi_ahs(ctask); + if (rc) + return rc; + } if (sc->sc_data_direction == DMA_TO_DEVICE) { + unsigned out_len = scsi_out(sc)->length; + hdr->data_length = cpu_to_be32(out_len); hdr->flags |= ISCSI_FLAG_CMD_WRITE; /* * Write counters: @@ -237,19 +269,19 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) ctask->unsol_datasn = 0; if (session->imm_data_en) { - if (scsi_bufflen(sc) >= session->first_burst) + if (out_len >= session->first_burst) ctask->imm_count = min(session->first_burst, conn->max_xmit_dlength); else - ctask->imm_count = min(scsi_bufflen(sc), + ctask->imm_count = min(out_len, conn->max_xmit_dlength); hton24(hdr->dlength, ctask->imm_count); } else zero_data(hdr->dlength); if (!session->initial_r2t_en) { - ctask->unsol_count = min((session->first_burst), - (scsi_bufflen(sc))) - ctask->imm_count; + ctask->unsol_count = min(session->first_burst, out_len) + - ctask->imm_count; ctask->unsol_offset = ctask->imm_count; } @@ -259,6 +291,7 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) } else { hdr->flags |= ISCSI_FLAG_CMD_FINAL; zero_data(hdr->dlength); + hdr->data_length = cpu_to_be32(scsi_in(sc)->length); if (sc->sc_data_direction == DMA_FROM_DEVICE) hdr->flags |= ISCSI_FLAG_CMD_READ; @@ -277,10 +310,12 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) return EIO; conn->scsicmd_pdus_cnt++; - debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d " - "cmdsn %d win %d]\n", - sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", - conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc), + debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x " + "len %d bidi_len %d cmdsn %d win %d]\n", + scsi_bidi_cmnd(sc) ? "bidirectional" : + sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", + conn->id, sc, sc->cmnd[0], ctask->itt, + scsi_bufflen(sc), scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); return 0; } @@ -343,7 +378,12 @@ static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, conn->session->tt->cleanup_cmd_task(conn, ctask); sc->result = err; - scsi_set_resid(sc, scsi_bufflen(sc)); + if (!scsi_bidi_cmnd(sc)) + scsi_set_resid(sc, scsi_bufflen(sc)); + else { + scsi_out(sc)->resid = scsi_out(sc)->length; + scsi_in(sc)->resid = scsi_in(sc)->length; + } if (conn->ctask == ctask) conn->ctask = NULL; /* release ref from queuecommand */ @@ -478,6 +518,18 @@ invalid_datalen: min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); } + if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | + ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { + int res_count = be32_to_cpu(rhdr->bi_residual_count); + + if (scsi_bidi_cmnd(sc) && res_count > 0 && + (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || + res_count <= scsi_in(sc)->length)) + scsi_in(sc)->resid = res_count; + else + sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; + } + if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | ISCSI_FLAG_CMD_OVERFLOW)) { int res_count = be32_to_cpu(rhdr->residual_count); @@ -485,13 +537,11 @@ invalid_datalen: if (res_count > 0 && (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || res_count <= scsi_bufflen(sc))) + /* write side for bidi or uni-io set_resid */ scsi_set_resid(sc, res_count); else sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; - } else if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | - ISCSI_FLAG_CMD_BIDI_OVERFLOW)) - sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; - + } out: debug_scsi("done [sc %lx res %d itt 0x%x]\n", (long)sc, sc->result, ctask->itt); @@ -1147,7 +1197,12 @@ reject: fault: spin_unlock(&session->lock); debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason); - scsi_set_resid(sc, scsi_bufflen(sc)); + if (!scsi_bidi_cmnd(sc)) + scsi_set_resid(sc, scsi_bufflen(sc)); + else { + scsi_out(sc)->resid = scsi_out(sc)->length; + scsi_in(sc)->resid = scsi_in(sc)->length; + } sc->scsi_done(sc); spin_lock(host->host_lock); return 0; -- cgit v1.2.3