/* * Copyright(c) 2007 - 2008 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 */ /* * RPORT GENERAL INFO * * This file contains all processing regarding fc_rports. It contains the * rport state machine and does all rport interaction with the transport class. * There should be no other places in libfc that interact directly with the * transport class in regards to adding and deleting rports. * * fc_rport's represent N_Port's within the fabric. */ /* * RPORT LOCKING * * The rport should never hold the rport mutex and then attempt to acquire * either the lport or disc mutexes. The rport's mutex is considered lesser * than both the lport's mutex and the disc mutex. Refer to fc_lport.c for * more comments on the heirarchy. * * The locking strategy is similar to the lport's strategy. The lock protects * the rport's states and is held and released by the entry points to the rport * block. All _enter_* functions correspond to rport states and expect the rport * mutex to be locked before calling them. This means that rports only handle * one request or response at a time, since they're not critical for the I/O * path this potential over-use of the mutex is acceptable. */ #include #include #include #include #include #include #include #include #include #include #include "fc_libfc.h" struct workqueue_struct *rport_event_queue; static void fc_rport_enter_plogi(struct fc_rport_priv *); static void fc_rport_enter_prli(struct fc_rport_priv *); static void fc_rport_enter_rtv(struct fc_rport_priv *); static void fc_rport_enter_ready(struct fc_rport_priv *); static void fc_rport_enter_logo(struct fc_rport_priv *); static void fc_rport_enter_adisc(struct fc_rport_priv *); static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_seq *, struct fc_frame *); static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_seq *, struct fc_frame *); static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_seq *, struct fc_frame *); static void fc_rport_recv_logo_req(struct fc_lport *, struct fc_seq *, struct fc_frame *); static void fc_rport_timeout(struct work_struct *); static void fc_rport_error(struct fc_rport_priv *, struct fc_frame *); static void fc_rport_error_retry(struct fc_rport_priv *, struct fc_frame *); static void fc_rport_work(struct work_struct *); static const char *fc_rport_state_names[] = { [RPORT_ST_INIT] = "Init", [RPORT_ST_PLOGI] = "PLOGI", [RPORT_ST_PRLI] = "PRLI", [RPORT_ST_RTV] = "RTV", [RPORT_ST_READY] = "Ready", [RPORT_ST_LOGO] = "LOGO", [RPORT_ST_ADISC] = "ADISC", [RPORT_ST_DELETE] = "Delete", [RPORT_ST_RESTART] = "Restart", }; /** * fc_rport_lookup() - Lookup a remote port by port_id * @lport: The local port to lookup the remote port on * @port_id: The remote port ID to look up */ static struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport, u32 port_id) { struct fc_rport_priv *rdata; list_for_each_entry(rdata, &lport->disc.rports, peers) if (rdata->ids.port_id == port_id) return rdata; return NULL; } /** * fc_rport_create() - Create a new remote port * @lport: The local port this remote port will be associated with * @ids: The identifiers for the new remote port * * The remote port will start in the INIT state. * * Locking note: must be called with the disc_mutex held. */ static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, u32 port_id) { struct fc_rport_priv *rdata; rdata = lport->tt.rport_lookup(lport, port_id); if (rdata) return rdata; rdata = kzalloc(sizeof(*rdata), GFP_KERNEL); if (!rdata) return NULL; rdata->ids.node_name = -1; rdata->ids.port_name = -1; rdata->ids.port_id = port_id; rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; kref_init(&rdata->kref); mutex_init(&rdata->rp_mutex); rdata->local_port = lport; rdata->rp_state = RPORT_ST_INIT; rdata->event = RPORT_EV_NONE; rdata->flags = FC_RP_FLAGS_REC_SUPPORTED; rdata->e_d_tov = lport->e_d_tov; rdata->r_a_tov = lport->r_a_tov; rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout); INIT_WORK(&rdata->event_work, fc_rport_work); if (port_id != FC_FID_DIR_SERV) list_add(&rdata->peers, &lport->disc.rports); return rdata; } /** * fc_rport_destroy() - Free a remote port after last reference is released * @kref: The remote port's kref */ static void fc_rport_destroy(struct kref *kref) { struct fc_rport_priv *rdata; rdata = container_of(kref, struct fc_rport_priv, kref); kfree(rdata); } /** * fc_rport_state() - Return a string identifying the remote port's state * @rdata: The remote port */ static const char *fc_rport_state(struct fc_rport_priv *rdata) { const char *cp; cp = fc_rport_state_names[rdata->rp_state]; if (!cp) cp = "Unknown"; return cp; } /** * fc_set_rport_loss_tmo() - Set the remote port loss timeout * @rport: The remote port that gets a new timeout value * @timeout: The new timeout value (in seconds) */ void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout) { if (timeout) rport->dev_loss_tmo = timeout + 5; else rport->dev_loss_tmo = 30; } EXPORT_SYMBOL(fc_set_rport_loss_tmo); /** * fc_plogi_get_maxframe() - Get the maximum payload from the common service * parameters in a FLOGI frame * @flp: The FLOGI payload * @maxval: The maximum frame size upper limit; this may be less than what * is in the service parameters */ static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp, unsigned int maxval) { unsigned int mfs; /* * Get max payload from the common service parameters and the * class 3 receive data field size. */ mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK; if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) maxval = mfs; mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs); if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) maxval = mfs; return maxval; } /** * fc_rport_state_enter() - Change the state of a remote port * @rdata: The remote port whose state should change * @new: The new state * * Locking Note: Called with the rport lock held */ static void fc_rport_state_enter(struct fc_rport_priv *rdata, enum fc_rport_state new) { if (rdata->rp_state != new) rdata->retries = 0; rdata->rp_state = new; } /** * fc_rport_work() - Handler for remote port events in the rport_event_queue * @work: Handle to the remote port being dequeued */ static void fc_rport_work(struct work_struct *work) { u32 port_id; struct fc_rport_priv *rdata = container_of(work, struct fc_rport_priv, event_work); struct fc_rport_libfc_priv *rpriv; enum fc_rport_event event; struct fc_lport *lport = rdata->local_port; struct fc_rport_operations *rport_ops; struct fc_rport_identifiers ids; struct fc_rport *rport; int restart = 0; mutex_lock(&rdata->rp_mutex); event = rdata->event; rport_ops = rdata->ops; rport = rdata->rport; FC_RPORT_DBG(rdata, "work event %u\n", event); switch (event) { case RPORT_EV_READY: ids = rdata->ids; rdata->event = RPORT_EV_NONE; kref_get(&rdata->kref); mutex_unlock(&rdata->rp_mutex); if (!rport) rport = fc_remote_port_add(lport->host, 0, &ids); if (!rport) { FC_RPORT_DBG(rdata, "Failed to add the rport\n"); lport->tt.rport_logoff(rdata); kref_put(&rdata->kref, lport->tt.rport_destroy); return; } mutex_lock(&rdata->rp_mutex); if (rdata->rport) FC_RPORT_DBG(rdata, "rport already allocated\n"); rdata->rport = rport; rport->maxframe_size = rdata->maxframe_size; rport->supported_classes = rdata->supported_classes; rpriv = rport->dd_data; rpriv->local_port = lport; rpriv->rp_state = rdata->rp_state; rpriv->flags = rdata->flags; rpriv->e_d_tov = rdata->e_d_tov; rpriv->r_a_tov = rdata->r_a_tov; mutex_unlock(&rdata->rp_mutex); if (rport_ops && rport_ops->event_callback) { FC_RPORT_DBG(rdata, "callback ev %d\n", event); rport_ops->event_callback(lport, rdata, event); } kref_put(&rdata->kref, lport->tt.rport_destroy); break; case RPORT_EV_FAILED: case RPORT_EV_LOGO: case RPORT_EV_STOP: port_id = rdata->ids.port_id; mutex_unlock(&rdata->rp_mutex); if (port_id != FC_FID_DIR_SERV) { /* * We must drop rp_mutex before taking disc_mutex. * Re-evaluate state to allow for restart. * A transition to RESTART state must only happen * while disc_mutex is held and rdata is on the list. */ mutex_lock(&lport->disc.disc_mutex); mutex_lock(&rdata->rp_mutex); if (rdata->rp_state == RPORT_ST_RESTART) restart = 1; else list_del(&rdata->peers); rdata->event = RPORT_EV_NONE; mutex_unlock(&rdata->rp_mutex); mutex_unlock(&lport->disc.disc_mutex); } if (rport_ops && rport_ops->event_callback) { FC_RPORT_DBG(rdata, "callback ev %d\n", event); rport_ops->event_callback(lport, rdata, event); } cancel_delayed_work_sync(&rdata->retry_work); /* * Reset any outstanding exchanges before freeing rport. */ lport->tt.exch_mgr_reset(lport, 0, port_id); lport->tt.exch_mgr_reset(lport, port_id, 0); if (rport) { rpriv = rport->dd_data; rpriv->rp_state = RPORT_ST_DELETE; mutex_lock(&rdata->rp_mutex); rdata->rport = NULL; mutex_unlock(&rdata->rp_mutex); fc_remote_port_delete(rport); } if (restart) { mutex_lock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "work restart\n"); fc_rport_enter_plogi(rdata); mutex_unlock(&rdata->rp_mutex); } else kref_put(&rdata->kref, lport->tt.rport_destroy); break; default: mutex_unlock(&rdata->rp_mutex); break; } } /** * fc_rport_login() - Start the remote port login state machine * @rdata: The remote port to be logged in to * * Locking Note: Called without the rport lock held. This * function will hold the rport lock, call an _enter_* * function and then unlock the rport. * * This indicates the intent to be logged into the remote port. * If it appears we are already logged in, ADISC is used to verify * the setup. */ int fc_rport_login(struct fc_rport_priv *rdata) { mutex_lock(&rdata->rp_mutex); switch (rdata->rp_state) { case RPORT_ST_READY: FC_RPORT_DBG(rdata, "ADISC port\n"); fc_rport_enter_adisc(rdata); break; case RPORT_ST_RESTART: break; case RPORT_ST_DELETE: FC_RPORT_DBG(rdata, "Restart deleted port\n"); fc_rport_state_enter(rdata, RPORT_ST_RESTART); break; default: FC_RPORT_DBG(rdata, "Login to port\n"); fc_rport_enter_plogi(rdata); break; } mutex_unlock(&rdata->rp_mutex); return 0; } /** * fc_rport_enter_delete() - Schedule a remote port to be deleted * @rdata: The remote port to be deleted * @event: The event to report as the reason for deletion * * Locking Note: Called with the rport lock held. * * Allow state change into DELETE only once. * * Call queue_work only if there's no event already pending. * Set the new event so that the old pending event will not occur. * Since we have the mutex, even if fc_rport_work() is already started, * it'll see the new event. */ static void fc_rport_enter_delete(struct fc_rport_priv *rdata, enum fc_rport_event event) { if (rdata->rp_state == RPORT_ST_DELETE) return; FC_RPORT_DBG(rdata, "Delete port\n"); fc_rport_state_enter(rdata, RPORT_ST_DELETE); if (rdata->event == RPORT_EV_NONE) queue_work(rport_event_queue, &rdata->event_work); rdata->event = event; } /** * fc_rport_logoff() - Logoff and remove a remote port * @rdata: The remote port to be logged off of * * Locking Note: Called without the rport lock held. This * function will hold the rport lock, call an _enter_* * function and then unlock the rport. */ int fc_rport_logoff(struct fc_rport_priv *rdata) { mutex_lock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Remove port\n"); if (rdata->rp_state == RPORT_ST_DELETE) { FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n"); goto out; } if (rdata->rp_state == RPORT_ST_RESTART) FC_RPORT_DBG(rdata, "Port in Restart state, deleting\n"); else fc_rport_enter_logo(rdata); /* * Change the state to Delete so that we discard * the response. */ fc_rport_enter_delete(rdata, RPORT_EV_STOP); out: mutex_unlock(&rdata->rp_mutex); return 0; } /** * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state * @rdata: The remote port that is ready * * Locking Note: The rport lock is expected to be held before calling * this routine. */ static void fc_rport_enter_ready(struct fc_rport_priv *rdata) { fc_rport_state_enter(rdata, RPORT_ST_READY); FC_RPORT_DBG(rdata, "Port is Ready\n"); if (rdata->event == RPORT_EV_NONE) queue_work(rport_event_queue, &rdata->event_work); rdata->event = RPORT_EV_READY; } /** * fc_rport_timeout() - Handler for the retry_work timer * @work: Handle to the remote port that has timed out * * Locking Note: Called without the rport lock held. This * function will hold the rport lock, call an _enter_* * function and then unlock the rport. */ static void fc_rport_timeout(struct work_struct *work) { struct fc_rport_priv *rdata = container_of(work, struct fc_rport_priv, retry_work.work); mutex_lock(&rdata->rp_mutex); switch (rdata->rp_state) { case RPORT_ST_PLOGI: fc_rport_enter_plogi(rdata); break; case RPORT_ST_PRLI: fc_rport_enter_prli(rdata); break; case RPORT_ST_RTV: fc_rport_enter_rtv(rdata); break; case RPORT_ST_LOGO: fc_rport_enter_logo(rdata); break; case RPORT_ST_ADISC: fc_rport_enter_adisc(rdata); break; case RPORT_ST_READY: case RPORT_ST_INIT: case RPORT_ST_DELETE: case RPORT_ST_RESTART: break; } mutex_unlock(&rdata->rp_mutex); } /** * fc_rport_error() - Error handler, called once retries have been exhausted * @rdata: The remote port the error is happened on * @fp: The error code encapsulated in a frame pointer * * Locking Note: The rport lock is expected to be held before * calling this routine */ static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp) { FC_RPORT_DBG(rdata, "Error %ld in state %s, retries %d\n", IS_ERR(fp) ? -PTR_ERR(fp) : 0, fc_rport_state(rdata), rdata->retries); switch (rdata->rp_state) { case RPORT_ST_PLOGI: case RPORT_ST_LOGO: fc_rport_enter_delete(rdata, RPORT_EV_FAILED); break; case RPORT_ST_RTV: fc_rport_enter_ready(rdata); break; case RPORT_ST_PRLI: case RPORT_ST_ADISC: fc_rport_enter_logo(rdata); break; case RPORT_ST_DELETE: case RPORT_ST_RESTART: case RPORT_ST_READY: case RPORT_ST_INIT: break; } } /** * fc_rport_error_retry() - Handler for remote port state retries * @rdata: The remote port whose state is to be retried * @fp: The error code encapsulated in a frame pointer * * If the error was an exchange timeout retry immediately, * otherwise wait for E_D_TOV. * * Locking Note: The rport lock is expected to be held before * calling this routine */ static void fc_rport_error_retry(struct fc_rport_priv *rdata, struct fc_frame *fp) { unsigned long delay = FC_DEF_E_D_TOV; /* make sure this isn't an FC_EX_CLOSED error, never retry those */ if (PTR_ERR(fp) == -FC_EX_CLOSED) return fc_rport_error(rdata, fp); if (rdata->retries < rdata->local_port->max_rport_retry_count) { FC_RPORT_DBG(rdata, "Error %ld in state %s, retrying\n", PTR_ERR(fp), fc_rport_state(rdata)); rdata->retries++; /* no additional delay on exchange timeouts */ if (PTR_ERR(fp) == -FC_EX_TIMEOUT) delay = 0; schedule_delayed_work(&rdata->retry_work, delay); return; } return fc_rport_error(rdata, fp); } /** * fc_rport_plogi_recv_resp() - Handler for ELS PLOGI responses * @sp: The sequence the PLOGI is on * @fp: The PLOGI response frame * @rdata_arg: The remote port that sent the PLOGI response * * Locking Note: This function will be called without the rport lock * held, but it will lock, call an _enter_* function or fc_rport_error * and then unlock the rport. */ static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp, void *rdata_arg) { struct fc_rport_priv *rdata = rdata_arg; struct fc_lport *lport = rdata->local_port; struct fc_els_flogi *plp = NULL; unsigned int tov; u16 csp_seq; u16 cssp_seq; u8 op; mutex_lock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp)); if (rdata->rp_state != RPORT_ST_PLOGI) { FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state " "%s\n", fc_rport_state(rdata)); if (IS_ERR(fp)) goto err; goto out; } if (IS_ERR(fp)) { fc_rport_error_retry(rdata, fp); goto err; } op = fc_frame_payload_op(fp); if (op == ELS_LS_ACC && (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) { rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn); rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn); tov = ntohl(plp->fl_csp.sp_e_d_tov); if (ntohs(plp->fl_csp.sp_features) & FC_SP_FT_EDTR) tov /= 1000000; if (tov > rdata->e_d_tov) rdata->e_d_tov = tov; csp_seq = ntohs(plp->fl_csp.sp_tot_seq); cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq); if (cssp_seq < csp_seq) csp_seq = cssp_seq; rdata->max_seq = csp_seq; rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs); fc_rport_enter_prli(rdata); } else fc_rport_error_retry(rdata, fp); out: fc_frame_free(fp); err: mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); } /** * fc_rport_enter_plogi() - Send Port Login (PLOGI) request * @rdata: The remote port to send a PLOGI to * * Locking Note: The rport lock is expected to be held before calling * this routine. */ static void fc_rport_enter_plogi(struct fc_rport_priv *rdata) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n", fc_rport_state(rdata)); fc_rport_state_enter(rdata, RPORT_ST_PLOGI); rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); if (!fp) { fc_rport_error_retry(rdata, fp); return; } rdata->e_d_tov = lport->e_d_tov; if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI, fc_rport_plogi_resp, rdata, 2 * lport->r_a_tov)) fc_rport_error_retry(rdata, NULL); else kref_get(&rdata->kref); } /** * fc_rport_prli_resp() - Process Login (PRLI) response handler * @sp: The sequence the PRLI response was on * @fp: The PRLI response frame * @rdata_arg: The remote port that sent the PRLI response * * Locking Note: This function will be called without the rport lock * held, but it will lock, call an _enter_* function or fc_rport_error * and then unlock the rport. */ static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, void *rdata_arg) { struct fc_rport_priv *rdata = rdata_arg; struct { struct fc_els_prli prli; struct fc_els_spp spp; } *pp; u32 roles = FC_RPORT_ROLE_UNKNOWN; u32 fcp_parm = 0; u8 op; u8 resp_code = 0; mutex_lock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp)); if (rdata->rp_state != RPORT_ST_PRLI) { FC_RPORT_DBG(rdata, "Received a PRLI response, but in state " "%s\n", fc_rport_state(rdata)); if (IS_ERR(fp)) goto err; goto out; } if (IS_ERR(fp)) { fc_rport_error_retry(rdata, fp); goto err; } /* reinitialize remote port roles */ rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; op = fc_frame_payload_op(fp); if (op == ELS_LS_ACC) { pp = fc_frame_payload_get(fp, sizeof(*pp)); if (!pp) goto out; resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK); FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x\n", pp->spp.spp_flags); if (resp_code != FC_SPP_RESP_ACK) { if (resp_code == FC_SPP_RESP_CONF) fc_rport_error(rdata, fp); else fc_rport_error_retry(rdata, fp); goto out; } if (pp->prli.prli_spp_len < sizeof(pp->spp)) goto out; fcp_parm = ntohl(pp->spp.spp_params); if (fcp_parm & FCP_SPPF_RETRY) rdata->flags |= FC_RP_FLAGS_RETRY; rdata->supported_classes = FC_COS_CLASS3; if (fcp_parm & FCP_SPPF_INIT_FCN) roles |= FC_RPORT_ROLE_FCP_INITIATOR; if (fcp_parm & FCP_SPPF_TARG_FCN) roles |= FC_RPORT_ROLE_FCP_TARGET; rdata->ids.roles = roles; fc_rport_enter_rtv(rdata); } else { FC_RPORT_DBG(rdata, "Bad ELS response for PRLI command\n"); fc_rport_error_retry(rdata, fp); } out: fc_frame_free(fp); err: mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); } /** * fc_rport_logo_resp() - Handler for logout (LOGO) responses * @sp: The sequence the LOGO was on * @fp: The LOGO response frame * @rdata_arg: The remote port that sent the LOGO response * * Locking Note: This function will be called without the rport lock * held, but it will lock, call an _enter_* function or fc_rport_error * and then unlock the rport. */ static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, void *rdata_arg) { struct fc_rport_priv *rdata = rdata_arg; u8 op; mutex_lock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Received a LOGO %s\n", fc_els_resp_type(fp)); if (rdata->rp_state != RPORT_ST_LOGO) { FC_RPORT_DBG(rdata, "Received a LOGO response, but in state " "%s\n", fc_rport_state(rdata)); if (IS_ERR(fp)) goto err; goto out; } if (IS_ERR(fp)) { fc_rport_error_retry(rdata, fp); goto err; } op = fc_frame_payload_op(fp); if (op != ELS_LS_ACC) FC_RPORT_DBG(rdata, "Bad ELS response op %x for LOGO command\n", op); fc_rport_enter_delete(rdata, RPORT_EV_LOGO); out: fc_frame_free(fp); err: mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); } /** * fc_rport_enter_prli() - Send Process Login (PRLI) request * @rdata: The remote port to send the PRLI request to * * Locking Note: The rport lock is expected to be held before calling * this routine. */ static void fc_rport_enter_prli(struct fc_rport_priv *rdata) { struct fc_lport *lport = rdata->local_port; struct { struct fc_els_prli prli; struct fc_els_spp spp; } *pp; struct fc_frame *fp; /* * If the rport is one of the well known addresses * we skip PRLI and RTV and go straight to READY. */ if (rdata->ids.port_id >= FC_FID_DOM_MGR) { fc_rport_enter_ready(rdata); return; } FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n", fc_rport_state(rdata)); fc_rport_state_enter(rdata, RPORT_ST_PRLI); fp = fc_frame_alloc(lport, sizeof(*pp)); if (!fp) { fc_rport_error_retry(rdata, fp); return; } if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PRLI, fc_rport_prli_resp, rdata, 2 * lport->r_a_tov)) fc_rport_error_retry(rdata, NULL); else kref_get(&rdata->kref); } /** * fc_rport_els_rtv_resp() - Handler for Request Timeout Value (RTV) responses * @sp: The sequence the RTV was on * @fp: The RTV response frame * @rdata_arg: The remote port that sent the RTV response * * Many targets don't seem to support this. * * Locking Note: This function will be called without the rport lock * held, but it will lock, call an _enter_* function or fc_rport_error * and then unlock the rport. */ static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp, void *rdata_arg) { struct fc_rport_priv *rdata = rdata_arg; u8 op; mutex_lock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp)); if (rdata->rp_state != RPORT_ST_RTV) { FC_RPORT_DBG(rdata, "Received a RTV response, but in state " "%s\n", fc_rport_state(rdata)); if (IS_ERR(fp)) goto err; goto out; } if (IS_ERR(fp)) { fc_rport_error(rdata, fp); goto err; } op = fc_frame_payload_op(fp); if (op == ELS_LS_ACC) { struct fc_els_rtv_acc *rtv; u32 toq; u32 tov; rtv = fc_frame_payload_get(fp, sizeof(*rtv)); if (rtv) { toq = ntohl(rtv->rtv_toq); tov = ntohl(rtv->rtv_r_a_tov); if (tov == 0) tov = 1; rdata->r_a_tov = tov; tov = ntohl(rtv->rtv_e_d_tov); if (toq & FC_ELS_RTV_EDRES) tov /= 1000000; if (tov == 0) tov = 1; rdata->e_d_tov = tov; } } fc_rport_enter_ready(rdata); out: fc_frame_free(fp); err: mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); } /** * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request * @rdata: The remote port to send the RTV request to * * Locking Note: The rport lock is expected to be held before calling * this routine. */ static void fc_rport_enter_rtv(struct fc_rport_priv *rdata) { struct fc_frame *fp; struct fc_lport *lport = rdata->local_port; FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n", fc_rport_state(rdata)); fc_rport_state_enter(rdata, RPORT_ST_RTV); fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv)); if (!fp) { fc_rport_error_retry(rdata, fp); return; } if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV, fc_rport_rtv_resp, rdata, 2 * lport->r_a_tov)) fc_rport_error_retry(rdata, NULL); else kref_get(&rdata->kref); } /** * fc_rport_enter_logo() - Send a logout (LOGO) request * @rdata: The remote port to send the LOGO request to * * Locking Note: The rport lock is expected to be held before calling * this routine. */ static void fc_rport_enter_logo(struct fc_rport_priv *rdata) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; FC_RPORT_DBG(rdata, "Port entered LOGO state from %s state\n", fc_rport_state(rdata)); fc_rport_state_enter(rdata, RPORT_ST_LOGO); fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo)); if (!fp) { fc_rport_error_retry(rdata, fp); return; } if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO, fc_rport_logo_resp, rdata, 2 * lport->r_a_tov)) fc_rport_error_retry(rdata, NULL); else kref_get(&rdata->kref); } /** * fc_rport_els_adisc_resp() - Handler for Address Discovery (ADISC) responses * @sp: The sequence the ADISC response was on * @fp: The ADISC response frame * @rdata_arg: The remote port that sent the ADISC response * * Locking Note: This function will be called without the rport lock * held, but it will lock, call an _enter_* function or fc_rport_error * and then unlock the rport. */ static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp, void *rdata_arg) { struct fc_rport_priv *rdata = rdata_arg; struct fc_els_adisc *adisc; u8 op; mutex_lock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Received a ADISC response\n"); if (rdata->rp_state != RPORT_ST_ADISC) { FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n", fc_rport_state(rdata)); if (IS_ERR(fp)) goto err; goto out; } if (IS_ERR(fp)) { fc_rport_error(rdata, fp); goto err; } /* * If address verification failed. Consider us logged out of the rport. * Since the rport is still in discovery, we want to be * logged in, so go to PLOGI state. Otherwise, go back to READY. */ op = fc_frame_payload_op(fp); adisc = fc_frame_payload_get(fp, sizeof(*adisc)); if (op != ELS_LS_ACC || !adisc || ntoh24(adisc->adisc_port_id) != rdata->ids.port_id || get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name || get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) { FC_RPORT_DBG(rdata, "ADISC error or mismatch\n"); fc_rport_enter_plogi(rdata); } else { FC_RPORT_DBG(rdata, "ADISC OK\n"); fc_rport_enter_ready(rdata); } out: fc_frame_free(fp); err: mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); } /** * fc_rport_enter_adisc() - Send Address Discover (ADISC) request * @rdata: The remote port to send the ADISC request to * * Locking Note: The rport lock is expected to be held before calling * this routine. */ static void fc_rport_enter_adisc(struct fc_rport_priv *rdata) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; FC_RPORT_DBG(rdata, "sending ADISC from %s state\n", fc_rport_state(rdata)); fc_rport_state_enter(rdata, RPORT_ST_ADISC); fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc)); if (!fp) { fc_rport_error_retry(rdata, fp); return; } if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC, fc_rport_adisc_resp, rdata, 2 * lport->r_a_tov)) fc_rport_error_retry(rdata, NULL); else kref_get(&rdata->kref); } /** * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests * @rdata: The remote port that sent the ADISC request * @sp: The sequence the ADISC request was on * @in_fp: The ADISC request frame * * Locking Note: Called with the lport and rport locks held. */ static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata, struct fc_seq *sp, struct fc_frame *in_fp) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; struct fc_exch *ep = fc_seq_exch(sp); struct fc_els_adisc *adisc; struct fc_seq_els_data rjt_data; u32 f_ctl; FC_RPORT_DBG(rdata, "Received ADISC request\n"); adisc = fc_frame_payload_get(in_fp, sizeof(*adisc)); if (!adisc) { rjt_data.fp = NULL; rjt_data.reason = ELS_RJT_PROT; rjt_data.explan = ELS_EXPL_INV_LEN; lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); goto drop; } fp = fc_frame_alloc(lport, sizeof(*adisc)); if (!fp) goto drop; fc_adisc_fill(lport, fp); adisc = fc_frame_payload_get(fp, sizeof(*adisc)); adisc->adisc_cmd = ELS_LS_ACC; sp = lport->tt.seq_start_next(sp); f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | 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); drop: fc_frame_free(in_fp); } /** * fc_rport_recv_rls_req() - Handle received Read Link Status request * @rdata: The remote port that sent the RLS request * @sp: The sequence that the RLS was on * @rx_fp: The PRLI request frame * * Locking Note: The rport lock is expected to be held before calling * this function. */ static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata, struct fc_seq *sp, struct fc_frame *rx_fp) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; struct fc_exch *ep = fc_seq_exch(sp); struct fc_els_rls *rls; struct fc_els_rls_resp *rsp; struct fc_els_lesb *lesb; struct fc_seq_els_data rjt_data; struct fc_host_statistics *hst; u32 f_ctl; FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n", fc_rport_state(rdata)); rls = fc_frame_payload_get(rx_fp, sizeof(*rls)); if (!rls) { rjt_data.reason = ELS_RJT_PROT; rjt_data.explan = ELS_EXPL_INV_LEN; goto out_rjt; } fp = fc_frame_alloc(lport, sizeof(*rsp)); if (!fp) { rjt_data.reason = ELS_RJT_UNAB; rjt_data.explan = ELS_EXPL_INSUF_RES; goto out_rjt; } rsp = fc_frame_payload_get(fp, sizeof(*rsp)); memset(rsp, 0, sizeof(*rsp)); rsp->rls_cmd = ELS_LS_ACC; lesb = &rsp->rls_lesb; if (lport->tt.get_lesb) { /* get LESB from LLD if it supports it */ lport->tt.get_lesb(lport, lesb); } else { fc_get_host_stats(lport->host); hst = &lport->host_stats; lesb->lesb_link_fail = htonl(hst->link_failure_count); lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count); lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count); lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count); lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count); lesb->lesb_inv_crc = htonl(hst->invalid_crc_count); } 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); goto out; out_rjt: rjt_data.fp = NULL; lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); out: fc_frame_free(rx_fp); } /** * fc_rport_recv_els_req() - Handler for validated ELS requests * @lport: The local port that received the ELS request * @sp: The sequence that the ELS request was on * @fp: The ELS request frame * * Handle incoming ELS requests that require port login. * The ELS opcode has already been validated by the caller. * * Locking Note: Called with the lport lock held. */ static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_seq *sp, struct fc_frame *fp) { struct fc_rport_priv *rdata; struct fc_frame_header *fh; struct fc_seq_els_data els_data; els_data.fp = NULL; els_data.reason = ELS_RJT_UNAB; els_data.explan = ELS_EXPL_PLOGI_REQD; fh = fc_frame_header_get(fp); mutex_lock(&lport->disc.disc_mutex); rdata = lport->tt.rport_lookup(lport, ntoh24(fh->fh_s_id)); if (!rdata) { mutex_unlock(&lport->disc.disc_mutex); goto reject; } mutex_lock(&rdata->rp_mutex); mutex_unlock(&lport->disc.disc_mutex); switch (rdata->rp_state) { case RPORT_ST_PRLI: case RPORT_ST_RTV: case RPORT_ST_READY: case RPORT_ST_ADISC: break; default: mutex_unlock(&rdata->rp_mutex); goto reject; } switch (fc_frame_payload_op(fp)) { case ELS_PRLI: fc_rport_recv_prli_req(rdata, sp, fp); break; case ELS_PRLO: fc_rport_recv_prlo_req(rdata, sp, fp); break; case ELS_ADISC: fc_rport_recv_adisc_req(rdata, sp, fp); break; case ELS_RRQ: els_data.fp = fp; lport->tt.seq_els_rsp_send(sp, ELS_RRQ, &els_data); break; case ELS_REC: els_data.fp = fp; lport->tt.seq_els_rsp_send(sp, ELS_REC, &els_data); break; case ELS_RLS: fc_rport_recv_rls_req(rdata, sp, fp); break; default: fc_frame_free(fp); /* can't happen */ break; } mutex_unlock(&rdata->rp_mutex); return; reject: lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data); fc_frame_free(fp); } /** * fc_rport_recv_req() - Handler for requests * @sp: The sequence the request was on * @fp: The request frame * @lport: The local port that received the request * * Locking Note: Called with the lport lock held. */ void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp, struct fc_lport *lport) { struct fc_seq_els_data els_data; /* * Handle PLOGI and LOGO requests separately, since they * don't require prior login. * Check for unsupported opcodes first and reject them. * For some ops, it would be incorrect to reject with "PLOGI required". */ switch (fc_frame_payload_op(fp)) { case ELS_PLOGI: fc_rport_recv_plogi_req(lport, sp, fp); break; case ELS_LOGO: fc_rport_recv_logo_req(lport, sp, fp); break; case ELS_PRLI: case ELS_PRLO: case ELS_ADISC: case ELS_RRQ: case ELS_REC: case ELS_RLS: fc_rport_recv_els_req(lport, sp, fp); break; default: fc_frame_free(fp); els_data.fp = NULL; els_data.reason = ELS_RJT_UNSUP; els_data.explan = ELS_EXPL_NONE; lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data); break; } } /** * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests * @lport: The local port that received the PLOGI request * @sp: The sequence that the PLOGI request was on * @rx_fp: The PLOGI request frame * * Locking Note: The rport lock is held before calling this function. */ static void fc_rport_recv_plogi_req(struct fc_lport *lport, struct fc_seq *sp, struct fc_frame *rx_fp) { struct fc_disc *disc; struct fc_rport_priv *rdata; struct fc_frame *fp = rx_fp; struct fc_exch *ep; struct fc_frame_header *fh; struct fc_els_flogi *pl; struct fc_seq_els_data rjt_data; u32 sid, f_ctl; rjt_data.fp = NULL; fh = fc_frame_header_get(fp); sid = ntoh24(fh->fh_s_id); FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n"); pl = fc_frame_payload_get(fp, sizeof(*pl)); if (!pl) { FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n"); rjt_data.reason = ELS_RJT_PROT; rjt_data.explan = ELS_EXPL_INV_LEN; goto reject; } disc = &lport->disc; mutex_lock(&disc->disc_mutex); rdata = lport->tt.rport_create(lport, sid); if (!rdata) { mutex_unlock(&disc->disc_mutex); rjt_data.reason = ELS_RJT_UNAB; rjt_data.explan = ELS_EXPL_INSUF_RES; goto reject; } mutex_lock(&rdata->rp_mutex); mutex_unlock(&disc->disc_mutex); rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn); rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn); /* * If the rport was just created, possibly due to the incoming PLOGI, * set the state appropriately and accept the PLOGI. * * If we had also sent a PLOGI, and if the received PLOGI is from a * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason * "command already in progress". * * XXX TBD: If the session was ready before, the PLOGI should result in * all outstanding exchanges being reset. */ switch (rdata->rp_state) { case RPORT_ST_INIT: FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n"); break; case RPORT_ST_PLOGI: FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n"); if (rdata->ids.port_name < lport->wwpn) { mutex_unlock(&rdata->rp_mutex); rjt_data.reason = ELS_RJT_INPROG; rjt_data.explan = ELS_EXPL_NONE; goto reject; } break; case RPORT_ST_PRLI: case RPORT_ST_RTV: case RPORT_ST_READY: case RPORT_ST_ADISC: FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d " "- ignored for now\n", rdata->rp_state); /* XXX TBD - should reset */ break; case RPORT_ST_DELETE: case RPORT_ST_LOGO: case RPORT_ST_RESTART: FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n", fc_rport_state(rdata)); mutex_unlock(&rdata->rp_mutex); rjt_data.reason = ELS_RJT_BUSY; rjt_data.explan = ELS_EXPL_NONE; goto reject; } /* * Get session payload size from incoming PLOGI. */ rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs); fc_frame_free(rx_fp); /* * Send LS_ACC. If this fails, the originator should retry. */ sp = lport->tt.seq_start_next(sp); if (!sp) goto out; fp = fc_frame_alloc(lport, sizeof(*pl)); if (!fp) goto out; fc_plogi_fill(lport, fp, ELS_LS_ACC); f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; 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); fc_rport_enter_prli(rdata); out: mutex_unlock(&rdata->rp_mutex); return; reject: lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); fc_frame_free(fp); } /** * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests * @rdata: The remote port that sent the PRLI request * @sp: The sequence that the PRLI was on * @rx_fp: The PRLI request frame * * Locking Note: The rport lock is exected to be held before calling * this function. */ static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata, struct fc_seq *sp, struct fc_frame *rx_fp) { struct fc_lport *lport = rdata->local_port; struct fc_exch *ep; struct fc_frame *fp; struct fc_frame_header *fh; struct { struct fc_els_prli prli; struct fc_els_spp spp; } *pp; struct fc_els_spp *rspp; /* request service param page */ struct fc_els_spp *spp; /* response spp */ unsigned int len; unsigned int plen; enum fc_els_spp_resp resp; struct fc_seq_els_data rjt_data; u32 f_ctl; u32 fcp_parm; u32 roles = FC_RPORT_ROLE_UNKNOWN; rjt_data.fp = NULL; fh = fc_frame_header_get(rx_fp); FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n", fc_rport_state(rdata)); len = fr_len(rx_fp) - sizeof(*fh); pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); if (!pp) goto reject_len; plen = ntohs(pp->prli.prli_len); if ((plen % 4) != 0 || plen > len || plen < 16) goto reject_len; if (plen < len) len = plen; plen = pp->prli.prli_spp_len; if ((plen % 4) != 0 || plen < sizeof(*spp) || plen > len || len < sizeof(*pp) || plen < 12) goto reject_len; rspp = &pp->spp; fp = fc_frame_alloc(lport, len); if (!fp) { rjt_data.reason = ELS_RJT_UNAB; rjt_data.explan = ELS_EXPL_INSUF_RES; goto reject; } sp = lport->tt.seq_start_next(sp); WARN_ON(!sp); pp = fc_frame_payload_get(fp, len); WARN_ON(!pp); memset(pp, 0, len); pp->prli.prli_cmd = ELS_LS_ACC; pp->prli.prli_spp_len = plen; pp->prli.prli_len = htons(len); len -= sizeof(struct fc_els_prli); /* reinitialize remote port roles */ rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; /* * Go through all the service parameter pages and build * response. If plen indicates longer SPP than standard, * use that. The entire response has been pre-cleared above. */ spp = &pp->spp; while (len >= plen) { spp->spp_type = rspp->spp_type; spp->spp_type_ext = rspp->spp_type_ext; spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR; resp = FC_SPP_RESP_ACK; switch (rspp->spp_type) { case 0: /* common to all FC-4 types */ break; case FC_TYPE_FCP: fcp_parm = ntohl(rspp->spp_params); if (fcp_parm & FCP_SPPF_RETRY) rdata->flags |= FC_RP_FLAGS_RETRY; rdata->supported_classes = FC_COS_CLASS3; if (fcp_parm & FCP_SPPF_INIT_FCN) roles |= FC_RPORT_ROLE_FCP_INITIATOR; if (fcp_parm & FCP_SPPF_TARG_FCN) roles |= FC_RPORT_ROLE_FCP_TARGET; rdata->ids.roles = roles; spp->spp_params = htonl(lport->service_params); break; default: resp = FC_SPP_RESP_INVL; break; } spp->spp_flags |= resp; len -= plen; rspp = (struct fc_els_spp *)((char *)rspp + plen); spp = (struct fc_els_spp *)((char *)spp + plen); } /* * Send LS_ACC. If this fails, the originator should retry. */ f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ; f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT; 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); switch (rdata->rp_state) { case RPORT_ST_PRLI: fc_rport_enter_ready(rdata); break; default: break; } goto drop; reject_len: rjt_data.reason = ELS_RJT_PROT; rjt_data.explan = ELS_EXPL_INV_LEN; reject: lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); drop: fc_frame_free(rx_fp); } /** * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests * @rdata: The remote port that sent the PRLO request * @sp: The sequence that the PRLO was on * @fp: The PRLO request frame * * Locking Note: The rport lock is exected to be held before calling * this function. */ static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata, struct fc_seq *sp, struct fc_frame *fp) { struct fc_lport *lport = rdata->local_port; struct fc_frame_header *fh; struct fc_seq_els_data rjt_data; fh = fc_frame_header_get(fp); FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n", fc_rport_state(rdata)); 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); } /** * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests * @lport: The local port that received the LOGO request * @sp: The sequence that the LOGO request was on * @fp: The LOGO request frame * * Locking Note: The rport lock is exected to be held before calling * this function. */ static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_seq *sp, struct fc_frame *fp) { struct fc_frame_header *fh; struct fc_rport_priv *rdata; u32 sid; lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); fh = fc_frame_header_get(fp); sid = ntoh24(fh->fh_s_id); mutex_lock(&lport->disc.disc_mutex); rdata = lport->tt.rport_lookup(lport, sid); if (rdata) { mutex_lock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n", fc_rport_state(rdata)); fc_rport_enter_delete(rdata, RPORT_EV_LOGO); /* * If the remote port was created due to discovery, set state * to log back in. It may have seen a stale RSCN about us. */ if (rdata->disc_id) fc_rport_state_enter(rdata, RPORT_ST_RESTART); mutex_unlock(&rdata->rp_mutex); } else FC_RPORT_ID_DBG(lport, sid, "Received LOGO from non-logged-in port\n"); mutex_unlock(&lport->disc.disc_mutex); fc_frame_free(fp); } /** * fc_rport_flush_queue() - Flush the rport_event_queue */ static void fc_rport_flush_queue(void) { flush_workqueue(rport_event_queue); } /** * fc_rport_init() - Initialize the remote port layer for a local port * @lport: The local port to initialize the remote port layer for */ int fc_rport_init(struct fc_lport *lport) { if (!lport->tt.rport_lookup) lport->tt.rport_lookup = fc_rport_lookup; if (!lport->tt.rport_create) lport->tt.rport_create = fc_rport_create; if (!lport->tt.rport_login) lport->tt.rport_login = fc_rport_login; if (!lport->tt.rport_logoff) lport->tt.rport_logoff = fc_rport_logoff; if (!lport->tt.rport_recv_req) lport->tt.rport_recv_req = fc_rport_recv_req; if (!lport->tt.rport_flush_queue) lport->tt.rport_flush_queue = fc_rport_flush_queue; if (!lport->tt.rport_destroy) lport->tt.rport_destroy = fc_rport_destroy; return 0; } EXPORT_SYMBOL(fc_rport_init); /** * fc_setup_rport() - Initialize the rport_event_queue */ int fc_setup_rport() { rport_event_queue = create_singlethread_workqueue("fc_rport_eq"); if (!rport_event_queue) return -ENOMEM; return 0; } /** * fc_destroy_rport() - Destroy the rport_event_queue */ void fc_destroy_rport() { destroy_workqueue(rport_event_queue); } /** * fc_rport_terminate_io() - Stop all outstanding I/O on a remote port * @rport: The remote port whose I/O should be terminated */ void fc_rport_terminate_io(struct fc_rport *rport) { struct fc_rport_libfc_priv *rpriv = rport->dd_data; struct fc_lport *lport = rpriv->local_port; lport->tt.exch_mgr_reset(lport, 0, rport->port_id); lport->tt.exch_mgr_reset(lport, rport->port_id, 0); } EXPORT_SYMBOL(fc_rport_terminate_io);