/* * 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 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_recv_plogi_req(struct fc_rport_priv *, 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_rport_priv *, 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_DELETE] = "Delete", }; static void fc_rport_rogue_destroy(struct device *dev) { struct fc_rport *rport = dev_to_rport(dev); struct fc_rport_priv *rdata = RPORT_TO_PRIV(rport); FC_RPORT_DBG(rdata, "Destroying rogue rport\n"); kfree(rport); } struct fc_rport_priv *fc_rport_rogue_create(struct fc_lport *lport, struct fc_rport_identifiers *ids) { struct fc_rport *rport; struct fc_rport_priv *rdata; rport = kzalloc(sizeof(*rport) + sizeof(*rdata), GFP_KERNEL); if (!rport) return NULL; rdata = RPORT_TO_PRIV(rport); rport->dd_data = rdata; rport->port_id = ids->port_id; rport->port_name = ids->port_name; rport->node_name = ids->node_name; rport->roles = ids->roles; rport->maxframe_size = FC_MIN_MAX_PAYLOAD; /* * Note: all this libfc rogue rport code will be removed for * upstream so it fine that this is really ugly and hacky right now. */ device_initialize(&rport->dev); rport->dev.release = fc_rport_rogue_destroy; rdata->ids = *ids; kref_init(&rdata->kref); mutex_init(&rdata->rp_mutex); rdata->rport = rport; rdata->local_port = lport; rdata->trans_state = FC_PORTSTATE_ROGUE; rdata->rp_state = RPORT_ST_INIT; rdata->event = RPORT_EV_NONE; rdata->flags = FC_RP_FLAGS_REC_SUPPORTED; rdata->ops = NULL; 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); /* * For good measure, but not necessary as we should only * add REAL rport to the lport list. */ INIT_LIST_HEAD(&rdata->peers); return rdata; } /** * fc_rport_destroy() - free a remote port after last reference is released. * @kref: pointer to kref inside struct fc_rport_priv */ static void fc_rport_destroy(struct kref *kref) { struct fc_rport_priv *rdata; struct fc_rport *rport; rdata = container_of(kref, struct fc_rport_priv, kref); rport = rdata->rport; put_device(&rport->dev); } /** * fc_rport_state() - return a string for the state the rport is in * @rdata: remote port private data */ 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 in seconds. * @rport: Pointer to Fibre Channel remote port structure * @timeout: timeout 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 max payload from the common service parameters * @flp: FLOGI payload structure * @maxval: upper limit, 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 rport's state * @rdata: The rport whose state should change * @new: The new state of the rport * * 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; } 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); enum fc_rport_event event; enum fc_rport_trans_state trans_state; struct fc_lport *lport = rdata->local_port; struct fc_rport_operations *rport_ops; struct fc_rport *new_rport; struct fc_rport_priv *new_rdata; struct fc_rport_identifiers ids; struct fc_rport *rport; mutex_lock(&rdata->rp_mutex); event = rdata->event; rport_ops = rdata->ops; rport = rdata->rport; switch (event) { case RPORT_EV_READY: ids = rdata->ids; rdata->event = RPORT_EV_NONE; mutex_unlock(&rdata->rp_mutex); new_rport = fc_remote_port_add(lport->host, 0, &ids); if (new_rport) { /* * Switch from the rogue rport to the rport * returned by the FC class. */ new_rport->maxframe_size = rdata->maxframe_size; new_rdata = new_rport->dd_data; new_rdata->rport = new_rport; new_rdata->ids = ids; new_rdata->e_d_tov = rdata->e_d_tov; new_rdata->r_a_tov = rdata->r_a_tov; new_rdata->ops = rdata->ops; new_rdata->local_port = rdata->local_port; new_rdata->flags = FC_RP_FLAGS_REC_SUPPORTED; new_rdata->trans_state = FC_PORTSTATE_REAL; new_rdata->maxframe_size = rdata->maxframe_size; new_rdata->supported_classes = rdata->supported_classes; kref_init(&new_rdata->kref); mutex_init(&new_rdata->rp_mutex); INIT_DELAYED_WORK(&new_rdata->retry_work, fc_rport_timeout); INIT_LIST_HEAD(&new_rdata->peers); INIT_WORK(&new_rdata->event_work, fc_rport_work); fc_rport_state_enter(new_rdata, RPORT_ST_READY); } else { printk(KERN_WARNING "libfc: Failed to allocate " " memory for rport (%6x)\n", ids.port_id); event = RPORT_EV_FAILED; } if (rdata->ids.port_id != FC_FID_DIR_SERV) if (rport_ops->event_callback) rport_ops->event_callback(lport, rdata, RPORT_EV_FAILED); kref_put(&rdata->kref, lport->tt.rport_destroy); rdata = new_rport->dd_data; if (rport_ops->event_callback) rport_ops->event_callback(lport, rdata, event); break; case RPORT_EV_FAILED: case RPORT_EV_LOGO: case RPORT_EV_STOP: trans_state = rdata->trans_state; mutex_unlock(&rdata->rp_mutex); if (rport_ops->event_callback) rport_ops->event_callback(lport, rdata, event); cancel_delayed_work_sync(&rdata->retry_work); if (trans_state == FC_PORTSTATE_ROGUE) kref_put(&rdata->kref, lport->tt.rport_destroy); else { port_id = rport->port_id; fc_remote_port_delete(rport); lport->tt.exch_mgr_reset(lport, 0, port_id); lport->tt.exch_mgr_reset(lport, port_id, 0); } break; default: mutex_unlock(&rdata->rp_mutex); break; } } /** * fc_rport_login() - Start the remote port login state machine * @rdata: private remote port * * 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_login(struct fc_rport_priv *rdata) { mutex_lock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Login to port\n"); fc_rport_enter_plogi(rdata); mutex_unlock(&rdata->rp_mutex); return 0; } /** * fc_rport_enter_delete() - schedule a remote port to be deleted. * @rdata: private remote port * @event: 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 an rport * @rdata: private remote port * * 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"); mutex_unlock(&rdata->rp_mutex); goto out; } fc_rport_enter_logo(rdata); /* * Change the state to Delete so that we discard * the response. */ fc_rport_enter_delete(rdata, RPORT_EV_STOP); mutex_unlock(&rdata->rp_mutex); out: return 0; } /** * fc_rport_enter_ready() - The rport is ready * @rdata: private remote port * * 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: The work struct of the fc_rport_priv * * 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_READY: case RPORT_ST_INIT: case RPORT_ST_DELETE: break; } mutex_unlock(&rdata->rp_mutex); } /** * fc_rport_error() - Error handler, called once retries have been exhausted * @rdata: private remote port * @fp: The 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", PTR_ERR(fp), fc_rport_state(rdata), rdata->retries); switch (rdata->rp_state) { case RPORT_ST_PLOGI: case RPORT_ST_PRLI: 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_DELETE: case RPORT_ST_READY: case RPORT_ST_INIT: break; } } /** * fc_rport_error_retry() - Error handler when retries are desired * @rdata: private remote port data * @fp: The 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() - Handle incoming ELS PLOGI response * @sp: current sequence in the PLOGI exchange * @fp: response frame * @rdata_arg: private remote port data * * 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 response\n"); 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 /= 1000; 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); /* * 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); else 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 to peer * @rdata: private remote port data * * 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, lport->e_d_tov)) fc_rport_error_retry(rdata, fp); else kref_get(&rdata->kref); } /** * fc_rport_prli_resp() - Process Login (PRLI) response handler * @sp: current sequence in the PRLI exchange * @fp: response frame * @rdata_arg: private remote port data * * 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; mutex_lock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Received a PRLI response\n"); 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; } op = fc_frame_payload_op(fp); if (op == ELS_LS_ACC) { pp = fc_frame_payload_get(fp, sizeof(*pp)); if (pp && pp->prli.prli_spp_len >= sizeof(pp->spp)) { 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_enter_delete(rdata, RPORT_EV_FAILED); } 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() - Logout (LOGO) response handler * @sp: current sequence in the LOGO exchange * @fp: response frame * @rdata_arg: private remote port data * * 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 response\n"); 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_enter_rtv(rdata); } else { FC_RPORT_DBG(rdata, "Bad ELS response for LOGO command\n"); 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 to peer * @rdata: private remote port data * * 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; 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, lport->e_d_tov)) fc_rport_error_retry(rdata, fp); else kref_get(&rdata->kref); } /** * fc_rport_els_rtv_resp() - Request Timeout Value response handler * @sp: current sequence in the RTV exchange * @fp: response frame * @rdata_arg: private remote port data * * 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 response\n"); 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 to peer * @rdata: private remote port data * * 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, lport->e_d_tov)) fc_rport_error_retry(rdata, fp); else kref_get(&rdata->kref); } /** * fc_rport_enter_logo() - Send Logout (LOGO) request to peer * @rdata: private remote port data * * 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, lport->e_d_tov)) fc_rport_error_retry(rdata, fp); else kref_get(&rdata->kref); } /** * fc_rport_recv_req() - Receive a request from a rport * @sp: current sequence in the PLOGI exchange * @fp: response frame * @rdata_arg: private remote port data * * Locking Note: Called without the rport lock held. This * function will hold the rport lock, call an _enter_* * function and then unlock the rport. */ void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp, struct fc_rport_priv *rdata) { struct fc_lport *lport = rdata->local_port; struct fc_frame_header *fh; struct fc_seq_els_data els_data; u8 op; mutex_lock(&rdata->rp_mutex); els_data.fp = NULL; els_data.explan = ELS_EXPL_NONE; els_data.reason = ELS_RJT_NONE; fh = fc_frame_header_get(fp); if (fh->fh_r_ctl == FC_RCTL_ELS_REQ && fh->fh_type == FC_TYPE_ELS) { op = fc_frame_payload_op(fp); switch (op) { case ELS_PLOGI: fc_rport_recv_plogi_req(rdata, sp, fp); break; 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_LOGO: fc_rport_recv_logo_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; default: els_data.reason = ELS_RJT_UNSUP; lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data); break; } } mutex_unlock(&rdata->rp_mutex); } /** * fc_rport_recv_plogi_req() - Handle incoming Port Login (PLOGI) request * @rdata: private remote port data * @sp: current sequence in the PLOGI exchange * @fp: PLOGI request frame * * Locking Note: The rport lock is exected to be held before calling * this function. */ static void fc_rport_recv_plogi_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 = 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; u64 wwpn; u64 wwnn; enum fc_els_rjt_reason reject = 0; u32 f_ctl; rjt_data.fp = NULL; fh = fc_frame_header_get(fp); FC_RPORT_DBG(rdata, "Received PLOGI request while in state %s\n", fc_rport_state(rdata)); sid = ntoh24(fh->fh_s_id); pl = fc_frame_payload_get(fp, sizeof(*pl)); if (!pl) { FC_RPORT_DBG(rdata, "Received PLOGI too short\n"); WARN_ON(1); /* XXX TBD: send reject? */ fc_frame_free(fp); return; } wwpn = get_unaligned_be64(&pl->fl_wwpn); wwnn = get_unaligned_be64(&pl->fl_wwnn); /* * If the session 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, wwpn %llx state INIT " "- reject\n", (unsigned long long)wwpn); reject = ELS_RJT_UNSUP; break; case RPORT_ST_PLOGI: FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state %d\n", rdata->rp_state); if (wwpn < lport->wwpn) reject = ELS_RJT_INPROG; break; case RPORT_ST_PRLI: case RPORT_ST_READY: 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: default: FC_RPORT_DBG(rdata, "Received PLOGI in unexpected " "state %d\n", rdata->rp_state); fc_frame_free(fp); return; break; } if (reject) { rjt_data.reason = reject; rjt_data.explan = ELS_EXPL_NONE; lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); fc_frame_free(fp); } else { fp = fc_frame_alloc(lport, sizeof(*pl)); if (fp == NULL) { fp = rx_fp; 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 { sp = lport->tt.seq_start_next(sp); WARN_ON(!sp); rdata->ids.port_name = wwpn; rdata->ids.node_name = wwnn; /* * Get session payload size from incoming PLOGI. */ rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs); fc_frame_free(rx_fp); fc_plogi_fill(lport, fp, ELS_LS_ACC); /* * 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); if (rdata->rp_state == RPORT_ST_PLOGI) fc_rport_enter_prli(rdata); } } } /** * fc_rport_recv_prli_req() - Handle incoming Process Login (PRLI) request * @rdata: private remote port data * @sp: current sequence in the PRLI exchange * @fp: 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_rjt_reason reason = ELS_RJT_UNAB; enum fc_els_rjt_explan explan = ELS_EXPL_NONE; 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)); switch (rdata->rp_state) { case RPORT_ST_PRLI: case RPORT_ST_READY: reason = ELS_RJT_NONE; break; default: fc_frame_free(rx_fp); return; break; } len = fr_len(rx_fp) - sizeof(*fh); pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); if (pp == NULL) { reason = ELS_RJT_PROT; explan = ELS_EXPL_INV_LEN; } else { plen = ntohs(pp->prli.prli_len); if ((plen % 4) != 0 || plen > len) { reason = ELS_RJT_PROT; explan = ELS_EXPL_INV_LEN; } else if (plen < len) { len = plen; } plen = pp->prli.prli_spp_len; if ((plen % 4) != 0 || plen < sizeof(*spp) || plen > len || len < sizeof(*pp)) { reason = ELS_RJT_PROT; explan = ELS_EXPL_INV_LEN; } rspp = &pp->spp; } if (reason != ELS_RJT_NONE || (fp = fc_frame_alloc(lport, len)) == NULL) { rjt_data.reason = reason; rjt_data.explan = explan; lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); } else { 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); /* * 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; if (rspp->spp_flags & FC_SPP_RPA_VAL) resp = FC_SPP_RESP_NO_PA; 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); /* * Get lock and re-check state. */ switch (rdata->rp_state) { case RPORT_ST_PRLI: fc_rport_enter_ready(rdata); break; case RPORT_ST_READY: break; default: break; } } fc_frame_free(rx_fp); } /** * fc_rport_recv_prlo_req() - Handle incoming Process Logout (PRLO) request * @rdata: private remote port data * @sp: current sequence in the PRLO exchange * @fp: 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)); if (rdata->rp_state == RPORT_ST_DELETE) { fc_frame_free(fp); return; } 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() - Handle incoming Logout (LOGO) request * @rdata: private remote port data * @sp: current sequence in the LOGO exchange * @fp: 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_rport_priv *rdata, struct fc_seq *sp, struct fc_frame *fp) { struct fc_frame_header *fh; struct fc_lport *lport = rdata->local_port; fh = fc_frame_header_get(fp); FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n", fc_rport_state(rdata)); if (rdata->rp_state == RPORT_ST_DELETE) { fc_frame_free(fp); return; } rdata->event = RPORT_EV_LOGO; fc_rport_state_enter(rdata, RPORT_ST_DELETE); queue_work(rport_event_queue, &rdata->event_work); lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); fc_frame_free(fp); } static void fc_rport_flush_queue(void) { flush_workqueue(rport_event_queue); } int fc_rport_init(struct fc_lport *lport) { if (!lport->tt.rport_create) lport->tt.rport_create = fc_rport_rogue_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); int fc_setup_rport(void) { rport_event_queue = create_singlethread_workqueue("fc_rport_eq"); if (!rport_event_queue) return -ENOMEM; return 0; } EXPORT_SYMBOL(fc_setup_rport); void fc_destroy_rport(void) { destroy_workqueue(rport_event_queue); } EXPORT_SYMBOL(fc_destroy_rport); void fc_rport_terminate_io(struct fc_rport *rport) { struct fc_rport_libfc_priv *rp = rport->dd_data; struct fc_lport *lport = rp->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);