// SPDX-License-Identifier: GPL-2.0-only /* * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. * * 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 hierarchy. * * 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. */ /* * RPORT REFERENCE COUNTING * * A rport reference should be taken when: * - an rport is allocated * - a workqueue item is scheduled * - an ELS request is send * The reference should be dropped when: * - the workqueue function has finished * - the ELS response is handled * - an rport is removed */ #include <linux/kernel.h> #include <linux/spinlock.h> #include <linux/interrupt.h> #include <linux/slab.h> #include <linux/rcupdate.h> #include <linux/timer.h> #include <linux/workqueue.h> #include <linux/export.h> #include <linux/rculist.h> #include <asm/unaligned.h> #include <scsi/libfc.h> #include <scsi/fc_encode.h> #include "fc_libfc.h" static struct workqueue_struct *rport_event_queue; static void fc_rport_enter_flogi(struct fc_rport_priv *); 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_frame *); static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_frame *); static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_frame *); static void fc_rport_recv_logo_req(struct fc_lport *, struct fc_frame *); static void fc_rport_timeout(struct work_struct *); static void fc_rport_error(struct fc_rport_priv *, int); static void fc_rport_error_retry(struct fc_rport_priv *, int); static void fc_rport_work(struct work_struct *); static const char *fc_rport_state_names[] = { [RPORT_ST_INIT] = "Init", [RPORT_ST_FLOGI] = "FLOGI", [RPORT_ST_PLOGI_WAIT] = "PLOGI_WAIT", [RPORT_ST_PLOGI] = "PLOGI", [RPORT_ST_PRLI] = "PRLI", [RPORT_ST_RTV] = "RTV", [RPORT_ST_READY] = "Ready", [RPORT_ST_ADISC] = "ADISC", [RPORT_ST_DELETE] = "Delete", }; /** * 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 * * The reference count of the fc_rport_priv structure is * increased by one. */ struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport, u32 port_id) { struct fc_rport_priv *rdata = NULL, *tmp_rdata; rcu_read_lock(); list_for_each_entry_rcu(tmp_rdata, &lport->disc.rports, peers) if (tmp_rdata->ids.port_id == port_id && kref_get_unless_zero(&tmp_rdata->kref)) { rdata = tmp_rdata; break; } rcu_read_unlock(); return rdata; } EXPORT_SYMBOL(fc_rport_lookup); /** * 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. */ struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, u32 port_id) { struct fc_rport_priv *rdata; size_t rport_priv_size = sizeof(*rdata); lockdep_assert_held(&lport->disc.disc_mutex); rdata = fc_rport_lookup(lport, port_id); if (rdata) return rdata; if (lport->rport_priv_size > 0) rport_priv_size = lport->rport_priv_size; rdata = kzalloc(rport_priv_size, 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) { rdata->lld_event_callback = lport->tt.rport_event_callback; list_add_rcu(&rdata->peers, &lport->disc.rports); } return rdata; } EXPORT_SYMBOL(fc_rport_create); /** * fc_rport_destroy() - Free a remote port after last reference is released * @kref: The remote port's kref */ void fc_rport_destroy(struct kref *kref) { struct fc_rport_priv *rdata; rdata = container_of(kref, struct fc_rport_priv, kref); kfree_rcu(rdata, rcu); } EXPORT_SYMBOL(fc_rport_destroy); /** * 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; else rport->dev_loss_tmo = 1; } 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 or PLOGI 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 */ static void fc_rport_state_enter(struct fc_rport_priv *rdata, enum fc_rport_state new) { lockdep_assert_held(&rdata->rp_mutex); 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 * * Reference counting: drops kref on return */ 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; struct fc4_prov *prov; u8 type; 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; rdata->major_retries = 0; kref_get(&rdata->kref); mutex_unlock(&rdata->rp_mutex); if (!rport) { FC_RPORT_DBG(rdata, "No rport!\n"); rport = fc_remote_port_add(lport->host, 0, &ids); } if (!rport) { FC_RPORT_DBG(rdata, "Failed to add the rport\n"); fc_rport_logoff(rdata); kref_put(&rdata->kref, fc_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); } if (rdata->lld_event_callback) { FC_RPORT_DBG(rdata, "lld callback ev %d\n", event); rdata->lld_event_callback(lport, rdata, event); } kref_put(&rdata->kref, fc_rport_destroy); break; case RPORT_EV_FAILED: case RPORT_EV_LOGO: case RPORT_EV_STOP: if (rdata->prli_count) { mutex_lock(&fc_prov_mutex); for (type = 1; type < FC_FC4_PROV_SIZE; type++) { prov = fc_passive_prov[type]; if (prov && prov->prlo) prov->prlo(rdata); } mutex_unlock(&fc_prov_mutex); } port_id = rdata->ids.port_id; 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); } if (rdata->lld_event_callback) { FC_RPORT_DBG(rdata, "lld callback ev %d\n", event); rdata->lld_event_callback(lport, rdata, event); } if (cancel_delayed_work_sync(&rdata->retry_work)) kref_put(&rdata->kref, fc_rport_destroy); /* * 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); } mutex_lock(&rdata->rp_mutex); if (rdata->rp_state == RPORT_ST_DELETE) { if (port_id == FC_FID_DIR_SERV) { rdata->event = RPORT_EV_NONE; mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, fc_rport_destroy); } else if ((rdata->flags & FC_RP_STARTED) && rdata->major_retries < lport->max_rport_retry_count) { rdata->major_retries++; rdata->event = RPORT_EV_NONE; FC_RPORT_DBG(rdata, "work restart\n"); fc_rport_enter_flogi(rdata); mutex_unlock(&rdata->rp_mutex); } else { mutex_unlock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "work delete\n"); mutex_lock(&lport->disc.disc_mutex); list_del_rcu(&rdata->peers); mutex_unlock(&lport->disc.disc_mutex); kref_put(&rdata->kref, fc_rport_destroy); } } else { /* * Re-open for events. Reissue READY event if ready. */ rdata->event = RPORT_EV_NONE; if (rdata->rp_state == RPORT_ST_READY) { FC_RPORT_DBG(rdata, "work reopen\n"); fc_rport_enter_ready(rdata); } mutex_unlock(&rdata->rp_mutex); } break; default: mutex_unlock(&rdata->rp_mutex); break; } kref_put(&rdata->kref, fc_rport_destroy); } /** * fc_rport_login() - Start the remote port login state machine * @rdata: The remote port to be logged in to * * Initiates the RP state machine. It is called from the LP module. * This function will issue the following commands to the N_Port * identified by the FC ID provided. * * - PLOGI * - PRLI * - RTV * * 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); if (rdata->flags & FC_RP_STARTED) { FC_RPORT_DBG(rdata, "port already started\n"); mutex_unlock(&rdata->rp_mutex); return 0; } rdata->flags |= FC_RP_STARTED; switch (rdata->rp_state) { case RPORT_ST_READY: FC_RPORT_DBG(rdata, "ADISC port\n"); fc_rport_enter_adisc(rdata); break; case RPORT_ST_DELETE: FC_RPORT_DBG(rdata, "Restart deleted port\n"); break; case RPORT_ST_INIT: FC_RPORT_DBG(rdata, "Login to port\n"); fc_rport_enter_flogi(rdata); break; default: FC_RPORT_DBG(rdata, "Login in progress, state %s\n", fc_rport_state(rdata)); break; } mutex_unlock(&rdata->rp_mutex); return 0; } EXPORT_SYMBOL(fc_rport_login); /** * 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 * * 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. * * Reference counting: does not modify kref */ static void fc_rport_enter_delete(struct fc_rport_priv *rdata, enum fc_rport_event event) { lockdep_assert_held(&rdata->rp_mutex); if (rdata->rp_state == RPORT_ST_DELETE) return; FC_RPORT_DBG(rdata, "Delete port\n"); fc_rport_state_enter(rdata, RPORT_ST_DELETE); kref_get(&rdata->kref); if (rdata->event == RPORT_EV_NONE && !queue_work(rport_event_queue, &rdata->event_work)) kref_put(&rdata->kref, fc_rport_destroy); 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) { struct fc_lport *lport = rdata->local_port; u32 port_id = rdata->ids.port_id; mutex_lock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Remove port\n"); rdata->flags &= ~FC_RP_STARTED; if (rdata->rp_state == RPORT_ST_DELETE) { FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n"); goto out; } /* * FC-LS states: * To explicitly Logout, the initiating Nx_Port shall terminate * other open Sequences that it initiated with the destination * Nx_Port prior to performing Logout. */ lport->tt.exch_mgr_reset(lport, 0, port_id); lport->tt.exch_mgr_reset(lport, port_id, 0); 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; } EXPORT_SYMBOL(fc_rport_logoff); /** * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state * @rdata: The remote port that is ready * * Reference counting: schedules workqueue, does not modify kref */ static void fc_rport_enter_ready(struct fc_rport_priv *rdata) { lockdep_assert_held(&rdata->rp_mutex); fc_rport_state_enter(rdata, RPORT_ST_READY); FC_RPORT_DBG(rdata, "Port is Ready\n"); kref_get(&rdata->kref); if (rdata->event == RPORT_EV_NONE && !queue_work(rport_event_queue, &rdata->event_work)) kref_put(&rdata->kref, fc_rport_destroy); 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. * * Reference counting: Drops kref on return. */ 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); FC_RPORT_DBG(rdata, "Port timeout, state %s\n", fc_rport_state(rdata)); switch (rdata->rp_state) { case RPORT_ST_FLOGI: fc_rport_enter_flogi(rdata); break; 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_ADISC: fc_rport_enter_adisc(rdata); break; case RPORT_ST_PLOGI_WAIT: case RPORT_ST_READY: case RPORT_ST_INIT: case RPORT_ST_DELETE: break; } mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, fc_rport_destroy); } /** * fc_rport_error() - Error handler, called once retries have been exhausted * @rdata: The remote port the error is happened on * @err: The error code * * Reference counting: does not modify kref */ static void fc_rport_error(struct fc_rport_priv *rdata, int err) { struct fc_lport *lport = rdata->local_port; lockdep_assert_held(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Error %d in state %s, retries %d\n", -err, fc_rport_state(rdata), rdata->retries); switch (rdata->rp_state) { case RPORT_ST_FLOGI: rdata->flags &= ~FC_RP_STARTED; fc_rport_enter_delete(rdata, RPORT_EV_FAILED); break; case RPORT_ST_PLOGI: if (lport->point_to_multipoint) { rdata->flags &= ~FC_RP_STARTED; fc_rport_enter_delete(rdata, RPORT_EV_FAILED); } else fc_rport_enter_logo(rdata); 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_PLOGI_WAIT: case RPORT_ST_DELETE: 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 * @err: The error code * * If the error was an exchange timeout retry immediately, * otherwise wait for E_D_TOV. * * Reference counting: increments kref when scheduling retry_work */ static void fc_rport_error_retry(struct fc_rport_priv *rdata, int err) { unsigned long delay = msecs_to_jiffies(rdata->e_d_tov); lockdep_assert_held(&rdata->rp_mutex); /* make sure this isn't an FC_EX_CLOSED error, never retry those */ if (err == -FC_EX_CLOSED) goto out; if (rdata->retries < rdata->local_port->max_rport_retry_count) { FC_RPORT_DBG(rdata, "Error %d in state %s, retrying\n", err, fc_rport_state(rdata)); rdata->retries++; /* no additional delay on exchange timeouts */ if (err == -FC_EX_TIMEOUT) delay = 0; kref_get(&rdata->kref); if (!schedule_delayed_work(&rdata->retry_work, delay)) kref_put(&rdata->kref, fc_rport_destroy); return; } out: fc_rport_error(rdata, err); } /** * fc_rport_login_complete() - Handle parameters and completion of p-mp login. * @rdata: The remote port which we logged into or which logged into us. * @fp: The FLOGI or PLOGI request or response frame * * Returns non-zero error if a problem is detected with the frame. * Does not free the frame. * * This is only used in point-to-multipoint mode for FIP currently. */ static int fc_rport_login_complete(struct fc_rport_priv *rdata, struct fc_frame *fp) { struct fc_lport *lport = rdata->local_port; struct fc_els_flogi *flogi; unsigned int e_d_tov; u16 csp_flags; flogi = fc_frame_payload_get(fp, sizeof(*flogi)); if (!flogi) return -EINVAL; csp_flags = ntohs(flogi->fl_csp.sp_features); if (fc_frame_payload_op(fp) == ELS_FLOGI) { if (csp_flags & FC_SP_FT_FPORT) { FC_RPORT_DBG(rdata, "Fabric bit set in FLOGI\n"); return -EINVAL; } } else { /* * E_D_TOV is not valid on an incoming FLOGI request. */ e_d_tov = ntohl(flogi->fl_csp.sp_e_d_tov); if (csp_flags & FC_SP_FT_EDTR) e_d_tov /= 1000000; if (e_d_tov > rdata->e_d_tov) rdata->e_d_tov = e_d_tov; } rdata->maxframe_size = fc_plogi_get_maxframe(flogi, lport->mfs); return 0; } /** * fc_rport_flogi_resp() - Handle response to FLOGI request for p-mp mode * @sp: The sequence that the FLOGI was on * @fp: The FLOGI response frame * @rp_arg: The remote port that received the FLOGI response */ static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, void *rp_arg) { struct fc_rport_priv *rdata = rp_arg; struct fc_lport *lport = rdata->local_port; struct fc_els_flogi *flogi; unsigned int r_a_tov; u8 opcode; int err = 0; FC_RPORT_DBG(rdata, "Received a FLOGI %s\n", IS_ERR(fp) ? "error" : fc_els_resp_type(fp)); if (fp == ERR_PTR(-FC_EX_CLOSED)) goto put; mutex_lock(&rdata->rp_mutex); if (rdata->rp_state != RPORT_ST_FLOGI) { FC_RPORT_DBG(rdata, "Received a FLOGI 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, PTR_ERR(fp)); goto err; } opcode = fc_frame_payload_op(fp); if (opcode == ELS_LS_RJT) { struct fc_els_ls_rjt *rjt; rjt = fc_frame_payload_get(fp, sizeof(*rjt)); FC_RPORT_DBG(rdata, "FLOGI ELS rejected, reason %x expl %x\n", rjt->er_reason, rjt->er_explan); err = -FC_EX_ELS_RJT; goto bad; } else if (opcode != ELS_LS_ACC) { FC_RPORT_DBG(rdata, "FLOGI ELS invalid opcode %x\n", opcode); err = -FC_EX_ELS_RJT; goto bad; } if (fc_rport_login_complete(rdata, fp)) { FC_RPORT_DBG(rdata, "FLOGI failed, no login\n"); err = -FC_EX_INV_LOGIN; goto bad; } flogi = fc_frame_payload_get(fp, sizeof(*flogi)); if (!flogi) { err = -FC_EX_ALLOC_ERR; goto bad; } r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov); if (r_a_tov > rdata->r_a_tov) rdata->r_a_tov = r_a_tov; if (rdata->ids.port_name < lport->wwpn) fc_rport_enter_plogi(rdata); else fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); out: fc_frame_free(fp); err: mutex_unlock(&rdata->rp_mutex); put: kref_put(&rdata->kref, fc_rport_destroy); return; bad: FC_RPORT_DBG(rdata, "Bad FLOGI response\n"); fc_rport_error_retry(rdata, err); goto out; } /** * fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp * @rdata: The remote port to send a FLOGI to * * Reference counting: increments kref when sending ELS */ static void fc_rport_enter_flogi(struct fc_rport_priv *rdata) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; lockdep_assert_held(&rdata->rp_mutex); if (!lport->point_to_multipoint) return fc_rport_enter_plogi(rdata); FC_RPORT_DBG(rdata, "Entered FLOGI state from %s state\n", fc_rport_state(rdata)); fc_rport_state_enter(rdata, RPORT_ST_FLOGI); fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); if (!fp) return fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR); kref_get(&rdata->kref); if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_FLOGI, fc_rport_flogi_resp, rdata, 2 * lport->r_a_tov)) { fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR); kref_put(&rdata->kref, fc_rport_destroy); } } /** * fc_rport_recv_flogi_req() - Handle Fabric Login (FLOGI) request in p-mp mode * @lport: The local port that received the PLOGI request * @rx_fp: The PLOGI request frame * * Reference counting: drops kref on return */ static void fc_rport_recv_flogi_req(struct fc_lport *lport, struct fc_frame *rx_fp) { struct fc_els_flogi *flp; struct fc_rport_priv *rdata; struct fc_frame *fp = rx_fp; struct fc_seq_els_data rjt_data; u32 sid; sid = fc_frame_sid(fp); FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n"); if (!lport->point_to_multipoint) { rjt_data.reason = ELS_RJT_UNSUP; rjt_data.explan = ELS_EXPL_NONE; goto reject; } flp = fc_frame_payload_get(fp, sizeof(*flp)); if (!flp) { rjt_data.reason = ELS_RJT_LOGIC; rjt_data.explan = ELS_EXPL_INV_LEN; goto reject; } rdata = fc_rport_lookup(lport, sid); if (!rdata) { rjt_data.reason = ELS_RJT_FIP; rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR; goto reject; } mutex_lock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n", fc_rport_state(rdata)); switch (rdata->rp_state) { case RPORT_ST_INIT: /* * If received the FLOGI request on RPORT which is INIT state * (means not transition to FLOGI either fc_rport timeout * function didn;t trigger or this end hasn;t received * beacon yet from other end. In that case only, allow RPORT * state machine to continue, otherwise fall through which * causes the code to send reject response. * NOTE; Not checking for FIP->state such as VNMP_UP or * VNMP_CLAIM because if FIP state is not one of those, * RPORT wouldn;t have created and 'rport_lookup' would have * failed anyway in that case. */ break; case RPORT_ST_DELETE: mutex_unlock(&rdata->rp_mutex); rjt_data.reason = ELS_RJT_FIP; rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR; goto reject_put; case RPORT_ST_FLOGI: case RPORT_ST_PLOGI_WAIT: case RPORT_ST_PLOGI: break; case RPORT_ST_PRLI: case RPORT_ST_RTV: case RPORT_ST_READY: case RPORT_ST_ADISC: /* * Set the remote port to be deleted and to then restart. * This queues work to be sure exchanges are reset. */ fc_rport_enter_delete(rdata, RPORT_EV_LOGO); mutex_unlock(&rdata->rp_mutex); rjt_data.reason = ELS_RJT_BUSY; rjt_data.explan = ELS_EXPL_NONE; goto reject_put; } if (fc_rport_login_complete(rdata, fp)) { mutex_unlock(&rdata->rp_mutex); rjt_data.reason = ELS_RJT_LOGIC; rjt_data.explan = ELS_EXPL_NONE; goto reject_put; } fp = fc_frame_alloc(lport, sizeof(*flp)); if (!fp) goto out; fc_flogi_fill(lport, fp); flp = fc_frame_payload_get(fp, sizeof(*flp)); flp->fl_cmd = ELS_LS_ACC; fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); lport->tt.frame_send(lport, fp); /* * Do not proceed with the state machine if our * FLOGI has crossed with an FLOGI from the * remote port; wait for the FLOGI response instead. */ if (rdata->rp_state != RPORT_ST_FLOGI) { if (rdata->ids.port_name < lport->wwpn) fc_rport_enter_plogi(rdata); else fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); } out: mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, fc_rport_destroy); fc_frame_free(rx_fp); return; reject_put: kref_put(&rdata->kref, fc_rport_destroy); reject: fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); fc_frame_free(rx_fp); } /** * fc_rport_plogi_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; u16 csp_seq; u16 cssp_seq; u8 op; FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp)); if (fp == ERR_PTR(-FC_EX_CLOSED)) goto put; mutex_lock(&rdata->rp_mutex); 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, PTR_ERR(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); /* save plogi response sp_features for further reference */ rdata->sp_features = ntohs(plp->fl_csp.sp_features); if (lport->point_to_multipoint) fc_rport_login_complete(rdata, fp); 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 { struct fc_els_ls_rjt *rjt; rjt = fc_frame_payload_get(fp, sizeof(*rjt)); if (!rjt) FC_RPORT_DBG(rdata, "PLOGI bad response\n"); else FC_RPORT_DBG(rdata, "PLOGI ELS rejected, reason %x expl %x\n", rjt->er_reason, rjt->er_explan); fc_rport_error_retry(rdata, -FC_EX_ELS_RJT); } out: fc_frame_free(fp); err: mutex_unlock(&rdata->rp_mutex); put: kref_put(&rdata->kref, fc_rport_destroy); } static bool fc_rport_compatible_roles(struct fc_lport *lport, struct fc_rport_priv *rdata) { if (rdata->ids.roles == FC_PORT_ROLE_UNKNOWN) return true; if ((rdata->ids.roles & FC_PORT_ROLE_FCP_TARGET) && (lport->service_params & FCP_SPPF_INIT_FCN)) return true; if ((rdata->ids.roles & FC_PORT_ROLE_FCP_INITIATOR) && (lport->service_params & FCP_SPPF_TARG_FCN)) return true; return false; } /** * fc_rport_enter_plogi() - Send Port Login (PLOGI) request * @rdata: The remote port to send a PLOGI to * * Reference counting: increments kref when sending ELS */ static void fc_rport_enter_plogi(struct fc_rport_priv *rdata) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; lockdep_assert_held(&rdata->rp_mutex); if (!fc_rport_compatible_roles(lport, rdata)) { FC_RPORT_DBG(rdata, "PLOGI suppressed for incompatible role\n"); fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); return; } 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_DBG(rdata, "%s frame alloc failed\n", __func__); fc_rport_error_retry(rdata, -FC_EX_ALLOC_ERR); return; } rdata->e_d_tov = lport->e_d_tov; kref_get(&rdata->kref); 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, -FC_EX_XMIT_ERR); kref_put(&rdata->kref, fc_rport_destroy); } } /** * 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; struct fc_els_spp temp_spp; struct fc_els_ls_rjt *rjt; struct fc4_prov *prov; u32 roles = FC_RPORT_ROLE_UNKNOWN; u32 fcp_parm = 0; u8 op; enum fc_els_spp_resp resp_code; FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp)); if (fp == ERR_PTR(-FC_EX_CLOSED)) goto put; mutex_lock(&rdata->rp_mutex); 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, PTR_ERR(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) { fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR); goto out; } resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK); FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x spp_type 0x%x\n", pp->spp.spp_flags, pp->spp.spp_type); rdata->spp_type = pp->spp.spp_type; if (resp_code != FC_SPP_RESP_ACK) { if (resp_code == FC_SPP_RESP_CONF) fc_rport_error(rdata, -FC_EX_SEQ_ERR); else fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR); goto out; } if (pp->prli.prli_spp_len < sizeof(pp->spp)) { fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR); goto out; } fcp_parm = ntohl(pp->spp.spp_params); if (fcp_parm & FCP_SPPF_RETRY) rdata->flags |= FC_RP_FLAGS_RETRY; if (fcp_parm & FCP_SPPF_CONF_COMPL) rdata->flags |= FC_RP_FLAGS_CONF_REQ; /* * Call prli provider if we should act as a target */ prov = fc_passive_prov[rdata->spp_type]; if (prov) { memset(&temp_spp, 0, sizeof(temp_spp)); prov->prli(rdata, pp->prli.prli_spp_len, &pp->spp, &temp_spp); } /* * Check if the image pair could be established */ if (rdata->spp_type != FC_TYPE_FCP || !(pp->spp.spp_flags & FC_SPP_EST_IMG_PAIR)) { /* * Nope; we can't use this port as a target. */ fcp_parm &= ~FCP_SPPF_TARG_FCN; } 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 { rjt = fc_frame_payload_get(fp, sizeof(*rjt)); if (!rjt) FC_RPORT_DBG(rdata, "PRLI bad response\n"); else FC_RPORT_DBG(rdata, "PRLI ELS rejected, reason %x expl %x\n", rjt->er_reason, rjt->er_explan); fc_rport_error_retry(rdata, FC_EX_ELS_RJT); } out: fc_frame_free(fp); err: mutex_unlock(&rdata->rp_mutex); put: kref_put(&rdata->kref, fc_rport_destroy); } /** * fc_rport_enter_prli() - Send Process Login (PRLI) request * @rdata: The remote port to send the PRLI request to * * Reference counting: increments kref when sending ELS */ 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; struct fc4_prov *prov; lockdep_assert_held(&rdata->rp_mutex); /* * 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; } /* * And if the local port does not support the initiator function * there's no need to send a PRLI, either. */ if (!(lport->service_params & FCP_SPPF_INIT_FCN)) { 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, -FC_EX_ALLOC_ERR); return; } fc_prli_fill(lport, fp); prov = fc_passive_prov[FC_TYPE_FCP]; if (prov) { pp = fc_frame_payload_get(fp, sizeof(*pp)); prov->prli(rdata, sizeof(pp->spp), NULL, &pp->spp); } fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rdata->ids.port_id, fc_host_port_id(lport->host), FC_TYPE_ELS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); kref_get(&rdata->kref); if (!fc_exch_seq_send(lport, fp, fc_rport_prli_resp, NULL, rdata, 2 * lport->r_a_tov)) { fc_rport_error_retry(rdata, -FC_EX_XMIT_ERR); kref_put(&rdata->kref, fc_rport_destroy); } } /** * fc_rport_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; FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp)); if (fp == ERR_PTR(-FC_EX_CLOSED)) goto put; mutex_lock(&rdata->rp_mutex); 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, PTR_ERR(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; if (tov > rdata->r_a_tov) 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; if (tov > rdata->e_d_tov) rdata->e_d_tov = tov; } } fc_rport_enter_ready(rdata); out: fc_frame_free(fp); err: mutex_unlock(&rdata->rp_mutex); put: kref_put(&rdata->kref, fc_rport_destroy); } /** * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request * @rdata: The remote port to send the RTV request to * * Reference counting: increments kref when sending ELS */ static void fc_rport_enter_rtv(struct fc_rport_priv *rdata) { struct fc_frame *fp; struct fc_lport *lport = rdata->local_port; lockdep_assert_held(&rdata->rp_mutex); 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, -FC_EX_ALLOC_ERR); return; } kref_get(&rdata->kref); 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, -FC_EX_XMIT_ERR); kref_put(&rdata->kref, fc_rport_destroy); } } /** * fc_rport_recv_rtv_req() - Handler for Read Timeout Value (RTV) requests * @rdata: The remote port that sent the RTV request * @in_fp: The RTV request frame */ static void fc_rport_recv_rtv_req(struct fc_rport_priv *rdata, struct fc_frame *in_fp) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; struct fc_els_rtv_acc *rtv; struct fc_seq_els_data rjt_data; lockdep_assert_held(&rdata->rp_mutex); lockdep_assert_held(&lport->lp_mutex); FC_RPORT_DBG(rdata, "Received RTV request\n"); fp = fc_frame_alloc(lport, sizeof(*rtv)); if (!fp) { rjt_data.reason = ELS_RJT_UNAB; rjt_data.explan = ELS_EXPL_INSUF_RES; fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data); goto drop; } rtv = fc_frame_payload_get(fp, sizeof(*rtv)); rtv->rtv_cmd = ELS_LS_ACC; rtv->rtv_r_a_tov = htonl(lport->r_a_tov); rtv->rtv_e_d_tov = htonl(lport->e_d_tov); rtv->rtv_toq = 0; fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0); lport->tt.frame_send(lport, fp); drop: fc_frame_free(in_fp); } /** * fc_rport_logo_resp() - Handler for logout (LOGO) responses * @sp: The sequence the LOGO was on * @fp: The LOGO response frame * @lport_arg: The local port */ static void fc_rport_logo_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; FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did, "Received a LOGO %s\n", fc_els_resp_type(fp)); if (!IS_ERR(fp)) fc_frame_free(fp); kref_put(&rdata->kref, fc_rport_destroy); } /** * fc_rport_enter_logo() - Send a logout (LOGO) request * @rdata: The remote port to send the LOGO request to * * Reference counting: increments kref when sending ELS */ static void fc_rport_enter_logo(struct fc_rport_priv *rdata) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; lockdep_assert_held(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n", fc_rport_state(rdata)); fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo)); if (!fp) return; kref_get(&rdata->kref); if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO, fc_rport_logo_resp, rdata, 0)) kref_put(&rdata->kref, fc_rport_destroy); } /** * 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; FC_RPORT_DBG(rdata, "Received a ADISC response\n"); if (fp == ERR_PTR(-FC_EX_CLOSED)) goto put; mutex_lock(&rdata->rp_mutex); 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, PTR_ERR(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_flogi(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); put: kref_put(&rdata->kref, fc_rport_destroy); } /** * fc_rport_enter_adisc() - Send Address Discover (ADISC) request * @rdata: The remote port to send the ADISC request to * * Reference counting: increments kref when sending ELS */ static void fc_rport_enter_adisc(struct fc_rport_priv *rdata) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; lockdep_assert_held(&rdata->rp_mutex); 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, -FC_EX_ALLOC_ERR); return; } kref_get(&rdata->kref); 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, -FC_EX_XMIT_ERR); kref_put(&rdata->kref, fc_rport_destroy); } } /** * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests * @rdata: The remote port that sent the ADISC request * @in_fp: The ADISC request frame */ static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata, struct fc_frame *in_fp) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; struct fc_els_adisc *adisc; struct fc_seq_els_data rjt_data; lockdep_assert_held(&rdata->rp_mutex); lockdep_assert_held(&lport->lp_mutex); FC_RPORT_DBG(rdata, "Received ADISC request\n"); adisc = fc_frame_payload_get(in_fp, sizeof(*adisc)); if (!adisc) { rjt_data.reason = ELS_RJT_PROT; rjt_data.explan = ELS_EXPL_INV_LEN; fc_seq_els_rsp_send(in_fp, 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; fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0); lport->tt.frame_send(lport, 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 * @rx_fp: The PRLI request frame */ static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata, struct fc_frame *rx_fp) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; 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; lockdep_assert_held(&rdata->rp_mutex); 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); } fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); lport->tt.frame_send(lport, fp); goto out; out_rjt: fc_seq_els_rsp_send(rx_fp, 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 * @fp: The ELS request frame * * Handle incoming ELS requests that require port login. * The ELS opcode has already been validated by the caller. * * Reference counting: does not modify kref */ static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp) { struct fc_rport_priv *rdata; struct fc_seq_els_data els_data; lockdep_assert_held(&lport->lp_mutex); rdata = fc_rport_lookup(lport, fc_frame_sid(fp)); if (!rdata) { FC_RPORT_ID_DBG(lport, fc_frame_sid(fp), "Received ELS 0x%02x from non-logged-in port\n", fc_frame_payload_op(fp)); goto reject; } mutex_lock(&rdata->rp_mutex); switch (rdata->rp_state) { case RPORT_ST_PRLI: case RPORT_ST_RTV: case RPORT_ST_READY: case RPORT_ST_ADISC: break; case RPORT_ST_PLOGI: if (fc_frame_payload_op(fp) == ELS_PRLI) { FC_RPORT_DBG(rdata, "Reject ELS PRLI " "while in state %s\n", fc_rport_state(rdata)); mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, fc_rport_destroy); goto busy; } /* fall through */ default: FC_RPORT_DBG(rdata, "Reject ELS 0x%02x while in state %s\n", fc_frame_payload_op(fp), fc_rport_state(rdata)); mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, fc_rport_destroy); goto reject; } switch (fc_frame_payload_op(fp)) { case ELS_PRLI: fc_rport_recv_prli_req(rdata, fp); break; case ELS_PRLO: fc_rport_recv_prlo_req(rdata, fp); break; case ELS_ADISC: fc_rport_recv_adisc_req(rdata, fp); break; case ELS_RRQ: fc_seq_els_rsp_send(fp, ELS_RRQ, NULL); fc_frame_free(fp); break; case ELS_REC: fc_seq_els_rsp_send(fp, ELS_REC, NULL); fc_frame_free(fp); break; case ELS_RLS: fc_rport_recv_rls_req(rdata, fp); break; case ELS_RTV: fc_rport_recv_rtv_req(rdata, fp); break; default: fc_frame_free(fp); /* can't happen */ break; } mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, fc_rport_destroy); return; reject: els_data.reason = ELS_RJT_UNAB; els_data.explan = ELS_EXPL_PLOGI_REQD; fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data); fc_frame_free(fp); return; busy: els_data.reason = ELS_RJT_BUSY; els_data.explan = ELS_EXPL_NONE; fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data); fc_frame_free(fp); return; } /** * fc_rport_recv_req() - Handler for requests * @lport: The local port that received the request * @fp: The request frame * * Reference counting: does not modify kref */ void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp) { struct fc_seq_els_data els_data; lockdep_assert_held(&lport->lp_mutex); /* * Handle FLOGI, 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_FLOGI: fc_rport_recv_flogi_req(lport, fp); break; case ELS_PLOGI: fc_rport_recv_plogi_req(lport, fp); break; case ELS_LOGO: fc_rport_recv_logo_req(lport, fp); break; case ELS_PRLI: case ELS_PRLO: case ELS_ADISC: case ELS_RRQ: case ELS_REC: case ELS_RLS: case ELS_RTV: fc_rport_recv_els_req(lport, fp); break; default: els_data.reason = ELS_RJT_UNSUP; els_data.explan = ELS_EXPL_NONE; fc_seq_els_rsp_send(fp, ELS_LS_RJT, &els_data); fc_frame_free(fp); break; } } EXPORT_SYMBOL(fc_rport_recv_req); /** * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests * @lport: The local port that received the PLOGI request * @rx_fp: The PLOGI request frame * * Reference counting: increments kref on return */ static void fc_rport_recv_plogi_req(struct fc_lport *lport, struct fc_frame *rx_fp) { struct fc_disc *disc; struct fc_rport_priv *rdata; struct fc_frame *fp = rx_fp; struct fc_els_flogi *pl; struct fc_seq_els_data rjt_data; u32 sid; lockdep_assert_held(&lport->lp_mutex); sid = fc_frame_sid(fp); 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 = fc_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_WAIT: FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI_WAIT 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_FLOGI: case RPORT_ST_DELETE: 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; } if (!fc_rport_compatible_roles(lport, rdata)) { FC_RPORT_DBG(rdata, "Received PLOGI for incompatible role\n"); mutex_unlock(&rdata->rp_mutex); rjt_data.reason = ELS_RJT_LOGIC; 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); /* * Send LS_ACC. If this fails, the originator should retry. */ fp = fc_frame_alloc(lport, sizeof(*pl)); if (!fp) goto out; fc_plogi_fill(lport, fp, ELS_LS_ACC); fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); lport->tt.frame_send(lport, fp); fc_rport_enter_prli(rdata); out: mutex_unlock(&rdata->rp_mutex); fc_frame_free(rx_fp); return; reject: fc_seq_els_rsp_send(fp, 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 * @rx_fp: The PRLI request frame */ static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata, struct fc_frame *rx_fp) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; 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; struct fc4_prov *prov; lockdep_assert_held(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n", fc_rport_state(rdata)); len = fr_len(rx_fp) - sizeof(struct fc_frame_header); 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; } 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; mutex_lock(&fc_prov_mutex); while (len >= plen) { rdata->spp_type = rspp->spp_type; spp->spp_type = rspp->spp_type; spp->spp_type_ext = rspp->spp_type_ext; resp = 0; if (rspp->spp_type < FC_FC4_PROV_SIZE) { enum fc_els_spp_resp active = 0, passive = 0; prov = fc_active_prov[rspp->spp_type]; if (prov) active = prov->prli(rdata, plen, rspp, spp); prov = fc_passive_prov[rspp->spp_type]; if (prov) passive = prov->prli(rdata, plen, rspp, spp); if (!active || passive == FC_SPP_RESP_ACK) resp = passive; else resp = active; FC_RPORT_DBG(rdata, "PRLI rspp type %x " "active %x passive %x\n", rspp->spp_type, active, passive); } if (!resp) { if (spp->spp_flags & FC_SPP_EST_IMG_PAIR) resp |= FC_SPP_RESP_CONF; else resp |= FC_SPP_RESP_INVL; } spp->spp_flags |= resp; len -= plen; rspp = (struct fc_els_spp *)((char *)rspp + plen); spp = (struct fc_els_spp *)((char *)spp + plen); } mutex_unlock(&fc_prov_mutex); /* * Send LS_ACC. If this fails, the originator should retry. */ fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); lport->tt.frame_send(lport, fp); goto drop; reject_len: rjt_data.reason = ELS_RJT_PROT; rjt_data.explan = ELS_EXPL_INV_LEN; reject: fc_seq_els_rsp_send(rx_fp, 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 * @rx_fp: The PRLO request frame */ static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata, struct fc_frame *rx_fp) { struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; struct { struct fc_els_prlo prlo; 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; struct fc_seq_els_data rjt_data; lockdep_assert_held(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n", fc_rport_state(rdata)); len = fr_len(rx_fp) - sizeof(struct fc_frame_header); pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); if (!pp) goto reject_len; plen = ntohs(pp->prlo.prlo_len); if (plen != 20) goto reject_len; if (plen < len) len = plen; 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; } pp = fc_frame_payload_get(fp, len); WARN_ON(!pp); memset(pp, 0, len); pp->prlo.prlo_cmd = ELS_LS_ACC; pp->prlo.prlo_obs = 0x10; pp->prlo.prlo_len = htons(len); spp = &pp->spp; spp->spp_type = rspp->spp_type; spp->spp_type_ext = rspp->spp_type_ext; spp->spp_flags = FC_SPP_RESP_ACK; fc_rport_enter_prli(rdata); fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); lport->tt.frame_send(lport, fp); goto drop; reject_len: rjt_data.reason = ELS_RJT_PROT; rjt_data.explan = ELS_EXPL_INV_LEN; reject: fc_seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); drop: fc_frame_free(rx_fp); } /** * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests * @lport: The local port that received the LOGO request * @fp: The LOGO request frame * * Reference counting: drops kref on return */ static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp) { struct fc_rport_priv *rdata; u32 sid; lockdep_assert_held(&lport->lp_mutex); fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL); sid = fc_frame_sid(fp); rdata = fc_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_STOP); mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, fc_rport_destroy); } else FC_RPORT_ID_DBG(lport, sid, "Received LOGO from non-logged-in port\n"); fc_frame_free(fp); } /** * fc_rport_flush_queue() - Flush the rport_event_queue */ void fc_rport_flush_queue(void) { flush_workqueue(rport_event_queue); } EXPORT_SYMBOL(fc_rport_flush_queue); /** * fc_rport_fcp_prli() - Handle incoming PRLI for the FCP initiator. * @rdata: remote port private * @spp_len: service parameter page length * @rspp: received service parameter page * @spp: response service parameter page * * Returns the value for the response code to be placed in spp_flags; * Returns 0 if not an initiator. */ static int fc_rport_fcp_prli(struct fc_rport_priv *rdata, u32 spp_len, const struct fc_els_spp *rspp, struct fc_els_spp *spp) { struct fc_lport *lport = rdata->local_port; u32 fcp_parm; fcp_parm = ntohl(rspp->spp_params); rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; if (fcp_parm & FCP_SPPF_INIT_FCN) rdata->ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR; if (fcp_parm & FCP_SPPF_TARG_FCN) rdata->ids.roles |= FC_RPORT_ROLE_FCP_TARGET; if (fcp_parm & FCP_SPPF_RETRY) rdata->flags |= FC_RP_FLAGS_RETRY; rdata->supported_classes = FC_COS_CLASS3; if (!(lport->service_params & FCP_SPPF_INIT_FCN)) return 0; spp->spp_flags |= rspp->spp_flags & FC_SPP_EST_IMG_PAIR; /* * OR in our service parameters with other providers (target), if any. */ fcp_parm = ntohl(spp->spp_params); spp->spp_params = htonl(fcp_parm | lport->service_params); return FC_SPP_RESP_ACK; } /* * FC-4 provider ops for FCP initiator. */ struct fc4_prov fc_rport_fcp_init = { .prli = fc_rport_fcp_prli, }; /** * fc_rport_t0_prli() - Handle incoming PRLI parameters for type 0 * @rdata: remote port private * @spp_len: service parameter page length * @rspp: received service parameter page * @spp: response service parameter page */ static int fc_rport_t0_prli(struct fc_rport_priv *rdata, u32 spp_len, const struct fc_els_spp *rspp, struct fc_els_spp *spp) { if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR) return FC_SPP_RESP_INVL; return FC_SPP_RESP_ACK; } /* * FC-4 provider ops for type 0 service parameters. * * This handles the special case of type 0 which is always successful * but doesn't do anything otherwise. */ struct fc4_prov fc_rport_t0_prov = { .prli = fc_rport_t0_prli, }; /** * fc_setup_rport() - Initialize the rport_event_queue */ int fc_setup_rport(void) { 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(void) { 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);