/* * Copyright(c) 2007 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope 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., * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. * * Maintained at www.Open-FCoE.org */ /* * PORT LOCKING NOTES * * These comments only apply to the 'port code' which consists of the lport, * disc and rport blocks. * * MOTIVATION * * The lport, disc and rport blocks all have mutexes that are used to protect * those objects. The main motivation for these locks is to prevent from * having an lport reset just before we send a frame. In that scenario the * lport's FID would get set to zero and then we'd send a frame with an * invalid SID. We also need to ensure that states don't change unexpectedly * while processing another state. * * HEIRARCHY * * The following heirarchy defines the locking rules. A greater lock * may be held before acquiring a lesser lock, but a lesser lock should never * be held while attempting to acquire a greater lock. Here is the heirarchy- * * lport > disc, lport > rport, disc > rport * * CALLBACKS * * The callbacks cause complications with this scheme. There is a callback * from the rport (to either lport or disc) and a callback from disc * (to the lport). * * As rports exit the rport state machine a callback is made to the owner of * the rport to notify success or failure. Since the callback is likely to * cause the lport or disc to grab its lock we cannot hold the rport lock * while making the callback. To ensure that the rport is not free'd while * processing the callback the rport callbacks are serialized through a * single-threaded workqueue. An rport would never be free'd while in a * callback handler becuase no other rport work in this queue can be executed * at the same time. * * When discovery succeeds or fails a callback is made to the lport as * notification. Currently, succesful discovery causes the lport to take no * action. A failure will cause the lport to reset. There is likely a circular * locking problem with this implementation. */ /* * LPORT LOCKING * * The critical sections protected by the lport's mutex are quite broad and * may be improved upon in the future. The lport code and its locking doesn't * influence the I/O path, so excessive locking doesn't penalize I/O * performance. * * The strategy is to lock whenever processing a request or response. Note * that every _enter_* function corresponds to a state change. They generally * change the lports state and then send a request out on the wire. We lock * before calling any of these functions to protect that state change. This * means that the entry points into the lport block manage the locks while * the state machine can transition between states (i.e. _enter_* functions) * while always staying protected. * * When handling responses we also hold the lport mutex broadly. When the * lport receives the response frame it locks the mutex and then calls the * appropriate handler for the particuar response. Generally a response will * trigger a state change and so the lock must already be held. * * Retries also have to consider the locking. The retries occur from a work * context and the work function will lock the lport and then retry the state * (i.e. _enter_* function). */ #include #include #include #include #include /* Fabric IDs to use for point-to-point mode, chosen on whims. */ #define FC_LOCAL_PTP_FID_LO 0x010101 #define FC_LOCAL_PTP_FID_HI 0x010102 #define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/ static void fc_lport_error(struct fc_lport *, struct fc_frame *); static void fc_lport_enter_reset(struct fc_lport *); static void fc_lport_enter_flogi(struct fc_lport *); static void fc_lport_enter_dns(struct fc_lport *); static void fc_lport_enter_rpn_id(struct fc_lport *); static void fc_lport_enter_rft_id(struct fc_lport *); static void fc_lport_enter_scr(struct fc_lport *); static void fc_lport_enter_ready(struct fc_lport *); static void fc_lport_enter_logo(struct fc_lport *); static const char *fc_lport_state_names[] = { [LPORT_ST_DISABLED] = "disabled", [LPORT_ST_FLOGI] = "FLOGI", [LPORT_ST_DNS] = "dNS", [LPORT_ST_RPN_ID] = "RPN_ID", [LPORT_ST_RFT_ID] = "RFT_ID", [LPORT_ST_SCR] = "SCR", [LPORT_ST_READY] = "Ready", [LPORT_ST_LOGO] = "LOGO", [LPORT_ST_RESET] = "reset", }; static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp) { fc_frame_free(fp); return 0; } /** * fc_lport_rport_callback() - Event handler for rport events * @lport: The lport which is receiving the event * @rport: The rport which the event has occured on * @event: The event that occured * * Locking Note: The rport lock should not be held when calling * this function. */ static void fc_lport_rport_callback(struct fc_lport *lport, struct fc_rport *rport, enum fc_rport_event event) { FC_LPORT_DBG(lport, "Received a %d event for port (%6x)\n", event, rport->port_id); switch (event) { case RPORT_EV_CREATED: if (rport->port_id == FC_FID_DIR_SERV) { mutex_lock(&lport->lp_mutex); if (lport->state == LPORT_ST_DNS) { lport->dns_rp = rport; fc_lport_enter_rpn_id(lport); } else { FC_LPORT_DBG(lport, "Received an CREATED event " "on port (%6x) for the directory " "server, but the lport is not " "in the DNS state, it's in the " "%d state", rport->port_id, lport->state); lport->tt.rport_logoff(rport); } mutex_unlock(&lport->lp_mutex); } else FC_LPORT_DBG(lport, "Received an event for port (%6x) " "which is not the directory server\n", rport->port_id); break; case RPORT_EV_LOGO: case RPORT_EV_FAILED: case RPORT_EV_STOP: if (rport->port_id == FC_FID_DIR_SERV) { mutex_lock(&lport->lp_mutex); lport->dns_rp = NULL; mutex_unlock(&lport->lp_mutex); } else FC_LPORT_DBG(lport, "Received an event for port (%6x) " "which is not the directory server\n", rport->port_id); break; case RPORT_EV_NONE: break; } } /** * fc_lport_state() - Return a string which represents the lport's state * @lport: The lport whose state is to converted to a string */ static const char *fc_lport_state(struct fc_lport *lport) { const char *cp; cp = fc_lport_state_names[lport->state]; if (!cp) cp = "unknown"; return cp; } /** * fc_lport_ptp_setup() - Create an rport for point-to-point mode * @lport: The lport to attach the ptp rport to * @fid: The FID of the ptp rport * @remote_wwpn: The WWPN of the ptp rport * @remote_wwnn: The WWNN of the ptp rport */ static void fc_lport_ptp_setup(struct fc_lport *lport, u32 remote_fid, u64 remote_wwpn, u64 remote_wwnn) { struct fc_disc_port dp; dp.lp = lport; dp.ids.port_id = remote_fid; dp.ids.port_name = remote_wwpn; dp.ids.node_name = remote_wwnn; dp.ids.roles = FC_RPORT_ROLE_UNKNOWN; if (lport->ptp_rp) { lport->tt.rport_logoff(lport->ptp_rp); lport->ptp_rp = NULL; } lport->ptp_rp = lport->tt.rport_create(&dp); lport->tt.rport_login(lport->ptp_rp); fc_lport_enter_ready(lport); } void fc_get_host_port_type(struct Scsi_Host *shost) { /* TODO - currently just NPORT */ fc_host_port_type(shost) = FC_PORTTYPE_NPORT; } EXPORT_SYMBOL(fc_get_host_port_type); void fc_get_host_port_state(struct Scsi_Host *shost) { struct fc_lport *lp = shost_priv(shost); if (lp->link_up) fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; else fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; } EXPORT_SYMBOL(fc_get_host_port_state); void fc_get_host_speed(struct Scsi_Host *shost) { struct fc_lport *lport = shost_priv(shost); fc_host_speed(shost) = lport->link_speed; } EXPORT_SYMBOL(fc_get_host_speed); struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost) { struct fc_host_statistics *fcoe_stats; struct fc_lport *lp = shost_priv(shost); struct timespec v0, v1; unsigned int cpu; fcoe_stats = &lp->host_stats; memset(fcoe_stats, 0, sizeof(struct fc_host_statistics)); jiffies_to_timespec(jiffies, &v0); jiffies_to_timespec(lp->boot_time, &v1); fcoe_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec); for_each_possible_cpu(cpu) { struct fcoe_dev_stats *stats; stats = per_cpu_ptr(lp->dev_stats, cpu); fcoe_stats->tx_frames += stats->TxFrames; fcoe_stats->tx_words += stats->TxWords; fcoe_stats->rx_frames += stats->RxFrames; fcoe_stats->rx_words += stats->RxWords; fcoe_stats->error_frames += stats->ErrorFrames; fcoe_stats->invalid_crc_count += stats->InvalidCRCCount; fcoe_stats->fcp_input_requests += stats->InputRequests; fcoe_stats->fcp_output_requests += stats->OutputRequests; fcoe_stats->fcp_control_requests += stats->ControlRequests; fcoe_stats->fcp_input_megabytes += stats->InputMegabytes; fcoe_stats->fcp_output_megabytes += stats->OutputMegabytes; fcoe_stats->link_failure_count += stats->LinkFailureCount; } fcoe_stats->lip_count = -1; fcoe_stats->nos_count = -1; fcoe_stats->loss_of_sync_count = -1; fcoe_stats->loss_of_signal_count = -1; fcoe_stats->prim_seq_protocol_err_count = -1; fcoe_stats->dumped_frames = -1; return fcoe_stats; } EXPORT_SYMBOL(fc_get_host_stats); /* * Fill in FLOGI command for request. */ static void fc_lport_flogi_fill(struct fc_lport *lport, struct fc_els_flogi *flogi, unsigned int op) { struct fc_els_csp *sp; struct fc_els_cssp *cp; memset(flogi, 0, sizeof(*flogi)); flogi->fl_cmd = (u8) op; put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn); put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn); sp = &flogi->fl_csp; sp->sp_hi_ver = 0x20; sp->sp_lo_ver = 0x20; sp->sp_bb_cred = htons(10); /* this gets set by gateway */ sp->sp_bb_data = htons((u16) lport->mfs); cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */ cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ); if (op != ELS_FLOGI) { sp->sp_features = htons(FC_SP_FT_CIRO); sp->sp_tot_seq = htons(255); /* seq. we accept */ sp->sp_rel_off = htons(0x1f); sp->sp_e_d_tov = htonl(lport->e_d_tov); cp->cp_rdfs = htons((u16) lport->mfs); cp->cp_con_seq = htons(255); cp->cp_open_seq = 1; } } /* * Add a supported FC-4 type. */ static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type) { __be32 *mp; mp = &lport->fcts.ff_type_map[type / FC_NS_BPW]; *mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW)); } /** * fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report. * @lport: Fibre Channel local port recieving the RLIR * @sp: current sequence in the RLIR exchange * @fp: RLIR request frame * * Locking Note: The lport lock is exected to be held before calling * this function. */ static void fc_lport_recv_rlir_req(struct fc_seq *sp, struct fc_frame *fp, struct fc_lport *lport) { FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n", fc_lport_state(lport)); lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); fc_frame_free(fp); } /** * fc_lport_recv_echo_req() - Handle received ECHO request * @lport: Fibre Channel local port recieving the ECHO * @sp: current sequence in the ECHO exchange * @fp: ECHO request frame * * Locking Note: The lport lock is exected to be held before calling * this function. */ static void fc_lport_recv_echo_req(struct fc_seq *sp, struct fc_frame *in_fp, struct fc_lport *lport) { struct fc_frame *fp; struct fc_exch *ep = fc_seq_exch(sp); unsigned int len; void *pp; void *dp; u32 f_ctl; FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n", fc_lport_state(lport)); len = fr_len(in_fp) - sizeof(struct fc_frame_header); pp = fc_frame_payload_get(in_fp, len); if (len < sizeof(__be32)) len = sizeof(__be32); fp = fc_frame_alloc(lport, len); if (fp) { dp = fc_frame_payload_get(fp, len); memcpy(dp, pp, len); *((u32 *)dp) = htonl(ELS_LS_ACC << 24); sp = lport->tt.seq_start_next(sp); f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ; fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, FC_TYPE_ELS, f_ctl, 0); lport->tt.seq_send(lport, sp, fp); } fc_frame_free(in_fp); } /** * fc_lport_recv_echo_req() - Handle received Request Node ID data request * @lport: Fibre Channel local port recieving the RNID * @sp: current sequence in the RNID exchange * @fp: RNID request frame * * Locking Note: The lport lock is exected to be held before calling * this function. */ static void fc_lport_recv_rnid_req(struct fc_seq *sp, struct fc_frame *in_fp, struct fc_lport *lport) { struct fc_frame *fp; struct fc_exch *ep = fc_seq_exch(sp); struct fc_els_rnid *req; struct { struct fc_els_rnid_resp rnid; struct fc_els_rnid_cid cid; struct fc_els_rnid_gen gen; } *rp; struct fc_seq_els_data rjt_data; u8 fmt; size_t len; u32 f_ctl; FC_LPORT_DBG(lport, "Received RNID request while in state %s\n", fc_lport_state(lport)); req = fc_frame_payload_get(in_fp, sizeof(*req)); if (!req) { rjt_data.fp = NULL; rjt_data.reason = ELS_RJT_LOGIC; rjt_data.explan = ELS_EXPL_NONE; lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); } else { fmt = req->rnid_fmt; len = sizeof(*rp); if (fmt != ELS_RNIDF_GEN || ntohl(lport->rnid_gen.rnid_atype) == 0) { fmt = ELS_RNIDF_NONE; /* nothing to provide */ len -= sizeof(rp->gen); } fp = fc_frame_alloc(lport, len); if (fp) { rp = fc_frame_payload_get(fp, len); memset(rp, 0, len); rp->rnid.rnid_cmd = ELS_LS_ACC; rp->rnid.rnid_fmt = fmt; rp->rnid.rnid_cid_len = sizeof(rp->cid); rp->cid.rnid_wwpn = htonll(lport->wwpn); rp->cid.rnid_wwnn = htonll(lport->wwnn); if (fmt == ELS_RNIDF_GEN) { rp->rnid.rnid_sid_len = sizeof(rp->gen); memcpy(&rp->gen, &lport->rnid_gen, sizeof(rp->gen)); } sp = lport->tt.seq_start_next(sp); f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, FC_TYPE_ELS, f_ctl, 0); lport->tt.seq_send(lport, sp, fp); } } fc_frame_free(in_fp); } /** * fc_lport_recv_adisc_req() - Handle received Address Discovery Request * @lport: Fibre Channel local port recieving the ADISC * @sp: current sequence in the ADISC exchange * @fp: ADISC request frame * * Locking Note: The lport lock is expected to be held before calling * this function. */ static void fc_lport_recv_adisc_req(struct fc_seq *sp, struct fc_frame *in_fp, struct fc_lport *lport) { struct fc_frame *fp; struct fc_exch *ep = fc_seq_exch(sp); struct fc_els_adisc *req, *rp; struct fc_seq_els_data rjt_data; size_t len; u32 f_ctl; FC_LPORT_DBG(lport, "Received ADISC request while in state %s\n", fc_lport_state(lport)); req = fc_frame_payload_get(in_fp, sizeof(*req)); if (!req) { rjt_data.fp = NULL; rjt_data.reason = ELS_RJT_LOGIC; rjt_data.explan = ELS_EXPL_NONE; lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); } else { len = sizeof(*rp); fp = fc_frame_alloc(lport, len); if (fp) { rp = fc_frame_payload_get(fp, len); memset(rp, 0, len); rp->adisc_cmd = ELS_LS_ACC; rp->adisc_wwpn = htonll(lport->wwpn); rp->adisc_wwnn = htonll(lport->wwnn); hton24(rp->adisc_port_id, fc_host_port_id(lport->host)); sp = lport->tt.seq_start_next(sp); f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, FC_TYPE_ELS, f_ctl, 0); lport->tt.seq_send(lport, sp, fp); } } fc_frame_free(in_fp); } /** * fc_lport_recv_logo_req() - Handle received fabric LOGO request * @lport: Fibre Channel local port recieving the LOGO * @sp: current sequence in the LOGO exchange * @fp: LOGO request frame * * Locking Note: The lport lock is exected to be held before calling * this function. */ static void fc_lport_recv_logo_req(struct fc_seq *sp, struct fc_frame *fp, struct fc_lport *lport) { lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); fc_lport_enter_reset(lport); fc_frame_free(fp); } /** * fc_fabric_login() - Start the lport state machine * @lport: The lport that should log into the fabric * * Locking Note: This function should not be called * with the lport lock held. */ int fc_fabric_login(struct fc_lport *lport) { int rc = -1; mutex_lock(&lport->lp_mutex); if (lport->state == LPORT_ST_DISABLED) { fc_lport_enter_reset(lport); rc = 0; } mutex_unlock(&lport->lp_mutex); return rc; } EXPORT_SYMBOL(fc_fabric_login); /** * fc_linkup() - Handler for transport linkup events * @lport: The lport whose link is up */ void fc_linkup(struct fc_lport *lport) { printk(KERN_INFO "libfc: Link up on port (%6x)\n", fc_host_port_id(lport->host)); mutex_lock(&lport->lp_mutex); if (!lport->link_up) { lport->link_up = 1; if (lport->state == LPORT_ST_RESET) fc_lport_enter_flogi(lport); } mutex_unlock(&lport->lp_mutex); } EXPORT_SYMBOL(fc_linkup); /** * fc_linkdown() - Handler for transport linkdown events * @lport: The lport whose link is down */ void fc_linkdown(struct fc_lport *lport) { mutex_lock(&lport->lp_mutex); printk(KERN_INFO "libfc: Link down on port (%6x)\n", fc_host_port_id(lport->host)); if (lport->link_up) { lport->link_up = 0; fc_lport_enter_reset(lport); lport->tt.fcp_cleanup(lport); } mutex_unlock(&lport->lp_mutex); } EXPORT_SYMBOL(fc_linkdown); /** * fc_fabric_logoff() - Logout of the fabric * @lport: fc_lport pointer to logoff the fabric * * Return value: * 0 for success, -1 for failure */ int fc_fabric_logoff(struct fc_lport *lport) { lport->tt.disc_stop_final(lport); mutex_lock(&lport->lp_mutex); if (lport->dns_rp) lport->tt.rport_logoff(lport->dns_rp); mutex_unlock(&lport->lp_mutex); lport->tt.rport_flush_queue(); mutex_lock(&lport->lp_mutex); fc_lport_enter_logo(lport); mutex_unlock(&lport->lp_mutex); cancel_delayed_work_sync(&lport->retry_work); return 0; } EXPORT_SYMBOL(fc_fabric_logoff); /** * fc_lport_destroy() - unregister a fc_lport * @lport: fc_lport pointer to unregister * * Return value: * None * Note: * exit routine for fc_lport instance * clean-up all the allocated memory * and free up other system resources. * */ int fc_lport_destroy(struct fc_lport *lport) { mutex_lock(&lport->lp_mutex); lport->state = LPORT_ST_DISABLED; lport->link_up = 0; lport->tt.frame_send = fc_frame_drop; mutex_unlock(&lport->lp_mutex); lport->tt.fcp_abort_io(lport); lport->tt.disc_stop_final(lport); lport->tt.exch_mgr_reset(lport, 0, 0); return 0; } EXPORT_SYMBOL(fc_lport_destroy); /** * fc_set_mfs() - sets up the mfs for the corresponding fc_lport * @lport: fc_lport pointer to unregister * @mfs: the new mfs for fc_lport * * Set mfs for the given fc_lport to the new mfs. * * Return: 0 for success */ int fc_set_mfs(struct fc_lport *lport, u32 mfs) { unsigned int old_mfs; int rc = -EINVAL; mutex_lock(&lport->lp_mutex); old_mfs = lport->mfs; if (mfs >= FC_MIN_MAX_FRAME) { mfs &= ~3; if (mfs > FC_MAX_FRAME) mfs = FC_MAX_FRAME; mfs -= sizeof(struct fc_frame_header); lport->mfs = mfs; rc = 0; } if (!rc && mfs < old_mfs) fc_lport_enter_reset(lport); mutex_unlock(&lport->lp_mutex); return rc; } EXPORT_SYMBOL(fc_set_mfs); /** * fc_lport_disc_callback() - Callback for discovery events * @lport: FC local port * @event: The discovery event */ void fc_lport_disc_callback(struct fc_lport *lport, enum fc_disc_event event) { switch (event) { case DISC_EV_SUCCESS: FC_LPORT_DBG(lport, "Discovery succeeded\n"); break; case DISC_EV_FAILED: printk(KERN_ERR "libfc: Discovery failed for port (%6x)\n", fc_host_port_id(lport->host)); mutex_lock(&lport->lp_mutex); fc_lport_enter_reset(lport); mutex_unlock(&lport->lp_mutex); break; case DISC_EV_NONE: WARN_ON(1); break; } } /** * fc_rport_enter_ready() - Enter the ready state and start discovery * @lport: Fibre Channel local port that is ready * * Locking Note: The lport lock is expected to be held before calling * this routine. */ static void fc_lport_enter_ready(struct fc_lport *lport) { FC_LPORT_DBG(lport, "Entered READY from state %s\n", fc_lport_state(lport)); fc_lport_state_enter(lport, LPORT_ST_READY); lport->tt.disc_start(fc_lport_disc_callback, lport); } /** * fc_lport_recv_flogi_req() - Receive a FLOGI request * @sp_in: The sequence the FLOGI is on * @rx_fp: The frame the FLOGI is in * @lport: The lport that recieved the request * * A received FLOGI request indicates a point-to-point connection. * Accept it with the common service parameters indicating our N port. * Set up to do a PLOGI if we have the higher-number WWPN. * * Locking Note: The lport lock is exected to be held before calling * this function. */ static void fc_lport_recv_flogi_req(struct fc_seq *sp_in, struct fc_frame *rx_fp, struct fc_lport *lport) { struct fc_frame *fp; struct fc_frame_header *fh; struct fc_seq *sp; struct fc_exch *ep; struct fc_els_flogi *flp; struct fc_els_flogi *new_flp; u64 remote_wwpn; u32 remote_fid; u32 local_fid; u32 f_ctl; FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n", fc_lport_state(lport)); fh = fc_frame_header_get(rx_fp); remote_fid = ntoh24(fh->fh_s_id); flp = fc_frame_payload_get(rx_fp, sizeof(*flp)); if (!flp) goto out; remote_wwpn = get_unaligned_be64(&flp->fl_wwpn); if (remote_wwpn == lport->wwpn) { printk(KERN_WARNING "libfc: Received FLOGI from port " "with same WWPN %llx\n", remote_wwpn); goto out; } FC_LPORT_DBG(lport, "FLOGI from port WWPN %llx\n", remote_wwpn); /* * XXX what is the right thing to do for FIDs? * The originator might expect our S_ID to be 0xfffffe. * But if so, both of us could end up with the same FID. */ local_fid = FC_LOCAL_PTP_FID_LO; if (remote_wwpn < lport->wwpn) { local_fid = FC_LOCAL_PTP_FID_HI; if (!remote_fid || remote_fid == local_fid) remote_fid = FC_LOCAL_PTP_FID_LO; } else if (!remote_fid) { remote_fid = FC_LOCAL_PTP_FID_HI; } fc_host_port_id(lport->host) = local_fid; fp = fc_frame_alloc(lport, sizeof(*flp)); if (fp) { sp = lport->tt.seq_start_next(fr_seq(rx_fp)); new_flp = fc_frame_payload_get(fp, sizeof(*flp)); fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI); new_flp->fl_cmd = (u8) ELS_LS_ACC; /* * Send the response. If this fails, the originator should * repeat the sequence. */ f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ; ep = fc_seq_exch(sp); fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid, FC_TYPE_ELS, f_ctl, 0); lport->tt.seq_send(lport, sp, fp); } else { fc_lport_error(lport, fp); } fc_lport_ptp_setup(lport, remote_fid, remote_wwpn, get_unaligned_be64(&flp->fl_wwnn)); lport->tt.disc_start(fc_lport_disc_callback, lport); out: sp = fr_seq(rx_fp); fc_frame_free(rx_fp); } /** * fc_lport_recv_req() - The generic lport request handler * @lport: The lport that received the request * @sp: The sequence the request is on * @fp: The frame the request is in * * This function will see if the lport handles the request or * if an rport should handle the request. * * Locking Note: This function should not be called with the lport * lock held becuase it will grab the lock. */ static void fc_lport_recv_req(struct fc_lport *lport, struct fc_seq *sp, struct fc_frame *fp) { struct fc_frame_header *fh = fc_frame_header_get(fp); void (*recv) (struct fc_seq *, struct fc_frame *, struct fc_lport *); struct fc_rport *rport; u32 s_id; u32 d_id; struct fc_seq_els_data rjt_data; mutex_lock(&lport->lp_mutex); /* * Handle special ELS cases like FLOGI, LOGO, and * RSCN here. These don't require a session. * Even if we had a session, it might not be ready. */ if (!lport->link_up) fc_frame_free(fp); else if (fh->fh_type == FC_TYPE_ELS && fh->fh_r_ctl == FC_RCTL_ELS_REQ) { /* * Check opcode. */ recv = NULL; switch (fc_frame_payload_op(fp)) { case ELS_FLOGI: recv = fc_lport_recv_flogi_req; break; case ELS_LOGO: fh = fc_frame_header_get(fp); if (ntoh24(fh->fh_s_id) == FC_FID_FLOGI) recv = fc_lport_recv_logo_req; break; case ELS_RSCN: recv = lport->tt.disc_recv_req; break; case ELS_ECHO: recv = fc_lport_recv_echo_req; break; case ELS_RLIR: recv = fc_lport_recv_rlir_req; break; case ELS_RNID: recv = fc_lport_recv_rnid_req; break; case ELS_ADISC: recv = fc_lport_recv_adisc_req; break; } if (recv) recv(sp, fp, lport); else { /* * Find session. * If this is a new incoming PLOGI, we won't find it. */ s_id = ntoh24(fh->fh_s_id); d_id = ntoh24(fh->fh_d_id); rport = lport->tt.rport_lookup(lport, s_id); if (rport) lport->tt.rport_recv_req(sp, fp, rport); else { rjt_data.fp = NULL; rjt_data.reason = ELS_RJT_UNAB; rjt_data.explan = ELS_EXPL_NONE; lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); fc_frame_free(fp); } } } else { FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)\n", fr_eof(fp)); fc_frame_free(fp); } mutex_unlock(&lport->lp_mutex); /* * The common exch_done for all request may not be good * if any request requires longer hold on exhange. XXX */ lport->tt.exch_done(sp); } /** * fc_lport_reset() - Reset an lport * @lport: The lport which should be reset * * Locking Note: This functions should not be called with the * lport lock held. */ int fc_lport_reset(struct fc_lport *lport) { cancel_delayed_work_sync(&lport->retry_work); mutex_lock(&lport->lp_mutex); fc_lport_enter_reset(lport); mutex_unlock(&lport->lp_mutex); return 0; } EXPORT_SYMBOL(fc_lport_reset); /** * fc_lport_reset_locked() - Reset the local port * @lport: Fibre Channel local port to be reset * * Locking Note: The lport lock is expected to be held before calling * this routine. */ static void fc_lport_reset_locked(struct fc_lport *lport) { if (lport->dns_rp) lport->tt.rport_logoff(lport->dns_rp); if (lport->ptp_rp) { lport->tt.rport_logoff(lport->ptp_rp); lport->ptp_rp = NULL; } lport->tt.disc_stop(lport); lport->tt.exch_mgr_reset(lport, 0, 0); fc_host_fabric_name(lport->host) = 0; fc_host_port_id(lport->host) = 0; } /** * fc_lport_enter_reset() - Reset the local port * @lport: Fibre Channel local port to be reset * * Locking Note: The lport lock is expected to be held before calling * this routine. */ static void fc_lport_enter_reset(struct fc_lport *lport) { FC_LPORT_DBG(lport, "Entered RESET state from %s state\n", fc_lport_state(lport)); fc_lport_state_enter(lport, LPORT_ST_RESET); fc_lport_reset_locked(lport); if (lport->link_up) fc_lport_enter_flogi(lport); } /** * fc_lport_enter_disabled() - disable the local port * @lport: Fibre Channel local port to be reset * * Locking Note: The lport lock is expected to be held before calling * this routine. */ static void fc_lport_enter_disabled(struct fc_lport *lport) { FC_LPORT_DBG(lport, "Entered disabled state from %s state\n", fc_lport_state(lport)); fc_lport_state_enter(lport, LPORT_ST_DISABLED); fc_lport_reset_locked(lport); } /** * fc_lport_error() - Handler for any errors * @lport: The fc_lport object * @fp: The frame pointer * * If the error was caused by a resource allocation failure * then wait for half a second and retry, otherwise retry * after the e_d_tov time. */ static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp) { unsigned long delay = 0; FC_LPORT_DBG(lport, "Error %ld in state %s, retries %d\n", PTR_ERR(fp), fc_lport_state(lport), lport->retry_count); if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { /* * Memory allocation failure, or the exchange timed out. * Retry after delay */ if (lport->retry_count < lport->max_retry_count) { lport->retry_count++; if (!fp) delay = msecs_to_jiffies(500); else delay = msecs_to_jiffies(lport->e_d_tov); schedule_delayed_work(&lport->retry_work, delay); } else { switch (lport->state) { case LPORT_ST_DISABLED: case LPORT_ST_READY: case LPORT_ST_RESET: case LPORT_ST_RPN_ID: case LPORT_ST_RFT_ID: case LPORT_ST_SCR: case LPORT_ST_DNS: case LPORT_ST_FLOGI: case LPORT_ST_LOGO: fc_lport_enter_reset(lport); break; } } } } /** * fc_lport_rft_id_resp() - Handle response to Register Fibre * Channel Types by ID (RPN_ID) request * @sp: current sequence in RPN_ID exchange * @fp: response frame * @lp_arg: Fibre Channel host port instance * * Locking Note: This function will be called without the lport lock * held, but it will lock, call an _enter_* function or fc_lport_error * and then unlock the lport. */ static void fc_lport_rft_id_resp(struct fc_seq *sp, struct fc_frame *fp, void *lp_arg) { struct fc_lport *lport = lp_arg; struct fc_frame_header *fh; struct fc_ct_hdr *ct; if (fp == ERR_PTR(-FC_EX_CLOSED)) return; mutex_lock(&lport->lp_mutex); FC_LPORT_DBG(lport, "Received a RFT_ID response\n"); if (lport->state != LPORT_ST_RFT_ID) { FC_LPORT_DBG(lport, "Received a RFT_ID response, but in state " "%s\n", fc_lport_state(lport)); if (IS_ERR(fp)) goto err; goto out; } if (IS_ERR(fp)) { fc_lport_error(lport, fp); goto err; } fh = fc_frame_header_get(fp); ct = fc_frame_payload_get(fp, sizeof(*ct)); if (fh && ct && fh->fh_type == FC_TYPE_CT && ct->ct_fs_type == FC_FST_DIR && ct->ct_fs_subtype == FC_NS_SUBTYPE && ntohs(ct->ct_cmd) == FC_FS_ACC) fc_lport_enter_scr(lport); else fc_lport_error(lport, fp); out: fc_frame_free(fp); err: mutex_unlock(&lport->lp_mutex); } /** * fc_lport_rpn_id_resp() - Handle response to Register Port * Name by ID (RPN_ID) request * @sp: current sequence in RPN_ID exchange * @fp: response frame * @lp_arg: Fibre Channel host port instance * * Locking Note: This function will be called without the lport lock * held, but it will lock, call an _enter_* function or fc_lport_error * and then unlock the lport. */ static void fc_lport_rpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, void *lp_arg) { struct fc_lport *lport = lp_arg; struct fc_frame_header *fh; struct fc_ct_hdr *ct; if (fp == ERR_PTR(-FC_EX_CLOSED)) return; mutex_lock(&lport->lp_mutex); FC_LPORT_DBG(lport, "Received a RPN_ID response\n"); if (lport->state != LPORT_ST_RPN_ID) { FC_LPORT_DBG(lport, "Received a RPN_ID response, but in state " "%s\n", fc_lport_state(lport)); if (IS_ERR(fp)) goto err; goto out; } if (IS_ERR(fp)) { fc_lport_error(lport, fp); goto err; } fh = fc_frame_header_get(fp); ct = fc_frame_payload_get(fp, sizeof(*ct)); if (fh && ct && fh->fh_type == FC_TYPE_CT && ct->ct_fs_type == FC_FST_DIR && ct->ct_fs_subtype == FC_NS_SUBTYPE && ntohs(ct->ct_cmd) == FC_FS_ACC) fc_lport_enter_rft_id(lport); else fc_lport_error(lport, fp); out: fc_frame_free(fp); err: mutex_unlock(&lport->lp_mutex); } /** * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request * @sp: current sequence in SCR exchange * @fp: response frame * @lp_arg: Fibre Channel lport port instance that sent the registration request * * Locking Note: This function will be called without the lport lock * held, but it will lock, call an _enter_* function or fc_lport_error * and then unlock the lport. */ static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp, void *lp_arg) { struct fc_lport *lport = lp_arg; u8 op; if (fp == ERR_PTR(-FC_EX_CLOSED)) return; mutex_lock(&lport->lp_mutex); FC_LPORT_DBG(lport, "Received a SCR response\n"); if (lport->state != LPORT_ST_SCR) { FC_LPORT_DBG(lport, "Received a SCR response, but in state " "%s\n", fc_lport_state(lport)); if (IS_ERR(fp)) goto err; goto out; } if (IS_ERR(fp)) { fc_lport_error(lport, fp); goto err; } op = fc_frame_payload_op(fp); if (op == ELS_LS_ACC) fc_lport_enter_ready(lport); else fc_lport_error(lport, fp); out: fc_frame_free(fp); err: mutex_unlock(&lport->lp_mutex); } /** * fc_lport_enter_scr() - Send a State Change Register (SCR) request * @lport: Fibre Channel local port to register for state changes * * Locking Note: The lport lock is expected to be held before calling * this routine. */ static void fc_lport_enter_scr(struct fc_lport *lport) { struct fc_frame *fp; FC_LPORT_DBG(lport, "Entered SCR state from %s state\n", fc_lport_state(lport)); fc_lport_state_enter(lport, LPORT_ST_SCR); fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr)); if (!fp) { fc_lport_error(lport, fp); return; } if (!lport->tt.elsct_send(lport, NULL, fp, ELS_SCR, fc_lport_scr_resp, lport, lport->e_d_tov)) fc_lport_error(lport, fp); } /** * fc_lport_enter_rft_id() - Register FC4-types with the name server * @lport: Fibre Channel local port to register * * Locking Note: The lport lock is expected to be held before calling * this routine. */ static void fc_lport_enter_rft_id(struct fc_lport *lport) { struct fc_frame *fp; struct fc_ns_fts *lps; int i; FC_LPORT_DBG(lport, "Entered RFT_ID state from %s state\n", fc_lport_state(lport)); fc_lport_state_enter(lport, LPORT_ST_RFT_ID); lps = &lport->fcts; i = sizeof(lps->ff_type_map) / sizeof(lps->ff_type_map[0]); while (--i >= 0) if (ntohl(lps->ff_type_map[i]) != 0) break; if (i < 0) { /* nothing to register, move on to SCR */ fc_lport_enter_scr(lport); return; } fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + sizeof(struct fc_ns_rft)); if (!fp) { fc_lport_error(lport, fp); return; } if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RFT_ID, fc_lport_rft_id_resp, lport, lport->e_d_tov)) fc_lport_error(lport, fp); } /** * fc_rport_enter_rft_id() - Register port name with the name server * @lport: Fibre Channel local port to register * * Locking Note: The lport lock is expected to be held before calling * this routine. */ static void fc_lport_enter_rpn_id(struct fc_lport *lport) { struct fc_frame *fp; FC_LPORT_DBG(lport, "Entered RPN_ID state from %s state\n", fc_lport_state(lport)); fc_lport_state_enter(lport, LPORT_ST_RPN_ID); fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + sizeof(struct fc_ns_rn_id)); if (!fp) { fc_lport_error(lport, fp); return; } if (!lport->tt.elsct_send(lport, NULL, fp, FC_NS_RPN_ID, fc_lport_rpn_id_resp, lport, lport->e_d_tov)) fc_lport_error(lport, fp); } static struct fc_rport_operations fc_lport_rport_ops = { .event_callback = fc_lport_rport_callback, }; /** * fc_rport_enter_dns() - Create a rport to the name server * @lport: Fibre Channel local port requesting a rport for the name server * * Locking Note: The lport lock is expected to be held before calling * this routine. */ static void fc_lport_enter_dns(struct fc_lport *lport) { struct fc_rport *rport; struct fc_rport_libfc_priv *rdata; struct fc_disc_port dp; dp.ids.port_id = FC_FID_DIR_SERV; dp.ids.port_name = -1; dp.ids.node_name = -1; dp.ids.roles = FC_RPORT_ROLE_UNKNOWN; dp.lp = lport; FC_LPORT_DBG(lport, "Entered DNS state from %s state\n", fc_lport_state(lport)); fc_lport_state_enter(lport, LPORT_ST_DNS); rport = lport->tt.rport_create(&dp); if (!rport) goto err; rdata = rport->dd_data; rdata->ops = &fc_lport_rport_ops; lport->tt.rport_login(rport); return; err: fc_lport_error(lport, NULL); } /** * fc_lport_timeout() - Handler for the retry_work timer. * @work: The work struct of the fc_lport */ static void fc_lport_timeout(struct work_struct *work) { struct fc_lport *lport = container_of(work, struct fc_lport, retry_work.work); mutex_lock(&lport->lp_mutex); switch (lport->state) { case LPORT_ST_DISABLED: case LPORT_ST_READY: case LPORT_ST_RESET: WARN_ON(1); break; case LPORT_ST_FLOGI: fc_lport_enter_flogi(lport); break; case LPORT_ST_DNS: fc_lport_enter_dns(lport); break; case LPORT_ST_RPN_ID: fc_lport_enter_rpn_id(lport); break; case LPORT_ST_RFT_ID: fc_lport_enter_rft_id(lport); break; case LPORT_ST_SCR: fc_lport_enter_scr(lport); break; case LPORT_ST_LOGO: fc_lport_enter_logo(lport); break; } mutex_unlock(&lport->lp_mutex); } /** * fc_lport_logo_resp() - Handle response to LOGO request * @sp: current sequence in LOGO exchange * @fp: response frame * @lp_arg: Fibre Channel lport port instance that sent the LOGO request * * Locking Note: This function will be called without the lport lock * held, but it will lock, call an _enter_* function or fc_lport_error * and then unlock the lport. */ static void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, void *lp_arg) { struct fc_lport *lport = lp_arg; u8 op; if (fp == ERR_PTR(-FC_EX_CLOSED)) return; mutex_lock(&lport->lp_mutex); FC_LPORT_DBG(lport, "Received a LOGO response\n"); if (lport->state != LPORT_ST_LOGO) { FC_LPORT_DBG(lport, "Received a LOGO response, but in state " "%s\n", fc_lport_state(lport)); if (IS_ERR(fp)) goto err; goto out; } if (IS_ERR(fp)) { fc_lport_error(lport, fp); goto err; } op = fc_frame_payload_op(fp); if (op == ELS_LS_ACC) fc_lport_enter_disabled(lport); else fc_lport_error(lport, fp); out: fc_frame_free(fp); err: mutex_unlock(&lport->lp_mutex); } /** * fc_rport_enter_logo() - Logout of the fabric * @lport: Fibre Channel local port to be logged out * * Locking Note: The lport lock is expected to be held before calling * this routine. */ static void fc_lport_enter_logo(struct fc_lport *lport) { struct fc_frame *fp; struct fc_els_logo *logo; FC_LPORT_DBG(lport, "Entered LOGO state from %s state\n", fc_lport_state(lport)); fc_lport_state_enter(lport, LPORT_ST_LOGO); fp = fc_frame_alloc(lport, sizeof(*logo)); if (!fp) { fc_lport_error(lport, fp); return; } if (!lport->tt.elsct_send(lport, NULL, fp, ELS_LOGO, fc_lport_logo_resp, lport, lport->e_d_tov)) fc_lport_error(lport, fp); } /** * fc_lport_flogi_resp() - Handle response to FLOGI request * @sp: current sequence in FLOGI exchange * @fp: response frame * @lp_arg: Fibre Channel lport port instance that sent the FLOGI request * * Locking Note: This function will be called without the lport lock * held, but it will lock, call an _enter_* function or fc_lport_error * and then unlock the lport. */ static void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, void *lp_arg) { struct fc_lport *lport = lp_arg; struct fc_frame_header *fh; struct fc_els_flogi *flp; u32 did; u16 csp_flags; unsigned int r_a_tov; unsigned int e_d_tov; u16 mfs; if (fp == ERR_PTR(-FC_EX_CLOSED)) return; mutex_lock(&lport->lp_mutex); FC_LPORT_DBG(lport, "Received a FLOGI response\n"); if (lport->state != LPORT_ST_FLOGI) { FC_LPORT_DBG(lport, "Received a FLOGI response, but in state " "%s\n", fc_lport_state(lport)); if (IS_ERR(fp)) goto err; goto out; } if (IS_ERR(fp)) { fc_lport_error(lport, fp); goto err; } fh = fc_frame_header_get(fp); did = ntoh24(fh->fh_d_id); if (fc_frame_payload_op(fp) == ELS_LS_ACC && did != 0) { printk(KERN_INFO "libfc: Assigned FID (%6x) in FLOGI response\n", did); fc_host_port_id(lport->host) = did; flp = fc_frame_payload_get(fp, sizeof(*flp)); if (flp) { mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK; if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < lport->mfs) lport->mfs = mfs; csp_flags = ntohs(flp->fl_csp.sp_features); r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov); e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov); if (csp_flags & FC_SP_FT_EDTR) e_d_tov /= 1000000; if ((csp_flags & FC_SP_FT_FPORT) == 0) { if (e_d_tov > lport->e_d_tov) lport->e_d_tov = e_d_tov; lport->r_a_tov = 2 * e_d_tov; printk(KERN_INFO "libfc: Port (%6x) entered " "point to point mode\n", did); fc_lport_ptp_setup(lport, ntoh24(fh->fh_s_id), get_unaligned_be64( &flp->fl_wwpn), get_unaligned_be64( &flp->fl_wwnn)); } else { lport->e_d_tov = e_d_tov; lport->r_a_tov = r_a_tov; fc_host_fabric_name(lport->host) = get_unaligned_be64(&flp->fl_wwnn); fc_lport_enter_dns(lport); } } if (flp) { csp_flags = ntohs(flp->fl_csp.sp_features); if ((csp_flags & FC_SP_FT_FPORT) == 0) { lport->tt.disc_start(fc_lport_disc_callback, lport); } } } else { FC_LPORT_DBG(lport, "Bad FLOGI response\n"); } out: fc_frame_free(fp); err: mutex_unlock(&lport->lp_mutex); } /** * fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager * @lport: Fibre Channel local port to be logged in to the fabric * * Locking Note: The lport lock is expected to be held before calling * this routine. */ void fc_lport_enter_flogi(struct fc_lport *lport) { struct fc_frame *fp; FC_LPORT_DBG(lport, "Entered FLOGI state from %s state\n", fc_lport_state(lport)); fc_lport_state_enter(lport, LPORT_ST_FLOGI); fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); if (!fp) return fc_lport_error(lport, fp); if (!lport->tt.elsct_send(lport, NULL, fp, ELS_FLOGI, fc_lport_flogi_resp, lport, lport->e_d_tov)) fc_lport_error(lport, fp); } /* Configure a fc_lport */ int fc_lport_config(struct fc_lport *lport) { INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout); mutex_init(&lport->lp_mutex); fc_lport_state_enter(lport, LPORT_ST_DISABLED); fc_lport_add_fc4_type(lport, FC_TYPE_FCP); fc_lport_add_fc4_type(lport, FC_TYPE_CT); return 0; } EXPORT_SYMBOL(fc_lport_config); int fc_lport_init(struct fc_lport *lport) { if (!lport->tt.lport_recv) lport->tt.lport_recv = fc_lport_recv_req; if (!lport->tt.lport_reset) lport->tt.lport_reset = fc_lport_reset; fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT; fc_host_node_name(lport->host) = lport->wwnn; fc_host_port_name(lport->host) = lport->wwpn; fc_host_supported_classes(lport->host) = FC_COS_CLASS3; memset(fc_host_supported_fc4s(lport->host), 0, sizeof(fc_host_supported_fc4s(lport->host))); fc_host_supported_fc4s(lport->host)[2] = 1; fc_host_supported_fc4s(lport->host)[7] = 1; /* This value is also unchanging */ memset(fc_host_active_fc4s(lport->host), 0, sizeof(fc_host_active_fc4s(lport->host))); fc_host_active_fc4s(lport->host)[2] = 1; fc_host_active_fc4s(lport->host)[7] = 1; fc_host_maxframe_size(lport->host) = lport->mfs; fc_host_supported_speeds(lport->host) = 0; if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT) fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT; if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT) fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT; return 0; } EXPORT_SYMBOL(fc_lport_init);