142e9a92fSRobert Love /* 242e9a92fSRobert Love * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. 342e9a92fSRobert Love * 442e9a92fSRobert Love * This program is free software; you can redistribute it and/or modify it 542e9a92fSRobert Love * under the terms and conditions of the GNU General Public License, 642e9a92fSRobert Love * version 2, as published by the Free Software Foundation. 742e9a92fSRobert Love * 842e9a92fSRobert Love * This program is distributed in the hope it will be useful, but WITHOUT 942e9a92fSRobert Love * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1042e9a92fSRobert Love * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 1142e9a92fSRobert Love * more details. 1242e9a92fSRobert Love * 1342e9a92fSRobert Love * You should have received a copy of the GNU General Public License along with 1442e9a92fSRobert Love * this program; if not, write to the Free Software Foundation, Inc., 1542e9a92fSRobert Love * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 1642e9a92fSRobert Love * 1742e9a92fSRobert Love * Maintained at www.Open-FCoE.org 1842e9a92fSRobert Love */ 1942e9a92fSRobert Love 2042e9a92fSRobert Love /* 2142e9a92fSRobert Love * Target Discovery 2242e9a92fSRobert Love * 2342e9a92fSRobert Love * This block discovers all FC-4 remote ports, including FCP initiators. It 2442e9a92fSRobert Love * also handles RSCN events and re-discovery if necessary. 2542e9a92fSRobert Love */ 2642e9a92fSRobert Love 2742e9a92fSRobert Love /* 2842e9a92fSRobert Love * DISC LOCKING 2942e9a92fSRobert Love * 3042e9a92fSRobert Love * The disc mutex is can be locked when acquiring rport locks, but may not 3142e9a92fSRobert Love * be held when acquiring the lport lock. Refer to fc_lport.c for more 3242e9a92fSRobert Love * details. 3342e9a92fSRobert Love */ 3442e9a92fSRobert Love 3542e9a92fSRobert Love #include <linux/timer.h> 365a0e3ad6STejun Heo #include <linux/slab.h> 3742e9a92fSRobert Love #include <linux/err.h> 3809703660SPaul Gortmaker #include <linux/export.h> 39b2d09103SIngo Molnar #include <linux/rculist.h> 40b2d09103SIngo Molnar 4142e9a92fSRobert Love #include <asm/unaligned.h> 4242e9a92fSRobert Love 4342e9a92fSRobert Love #include <scsi/fc/fc_gs.h> 4442e9a92fSRobert Love 4542e9a92fSRobert Love #include <scsi/libfc.h> 4642e9a92fSRobert Love 478866a5d9SRobert Love #include "fc_libfc.h" 488866a5d9SRobert Love 4942e9a92fSRobert Love #define FC_DISC_RETRY_LIMIT 3 /* max retries */ 5042e9a92fSRobert Love #define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ 5142e9a92fSRobert Love 5242e9a92fSRobert Love static void fc_disc_gpn_ft_req(struct fc_disc *); 5342e9a92fSRobert Love static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *); 54786681b9SJoe Eykholt static void fc_disc_done(struct fc_disc *, enum fc_disc_event); 5542e9a92fSRobert Love static void fc_disc_timeout(struct work_struct *); 562ab7e1ecSJoe Eykholt static int fc_disc_single(struct fc_lport *, struct fc_disc_port *); 5742e9a92fSRobert Love static void fc_disc_restart(struct fc_disc *); 5842e9a92fSRobert Love 5942e9a92fSRobert Love /** 603a3b42bfSRobert Love * fc_disc_stop_rports() - Delete all the remote ports associated with the lport 613a3b42bfSRobert Love * @disc: The discovery job to stop remote ports on 6242e9a92fSRobert Love */ 63c6b21c93SBart Van Assche static void fc_disc_stop_rports(struct fc_disc *disc) 6442e9a92fSRobert Love { 6542e9a92fSRobert Love struct fc_lport *lport; 6642e90414SJoe Eykholt struct fc_rport_priv *rdata; 6742e9a92fSRobert Love 680685230cSJoe Eykholt lport = fc_disc_lport(disc); 69ee35624eSHannes Reinecke lockdep_assert_held(&lport->lp_mutex); 7042e9a92fSRobert Love 71a407c593SHannes Reinecke rcu_read_lock(); 72a407c593SHannes Reinecke list_for_each_entry_rcu(rdata, &disc->rports, peers) { 73a407c593SHannes Reinecke if (kref_get_unless_zero(&rdata->kref)) { 74c96c792aSHannes Reinecke fc_rport_logoff(rdata); 75944ef968SHannes Reinecke kref_put(&rdata->kref, fc_rport_destroy); 76a407c593SHannes Reinecke } 77a407c593SHannes Reinecke } 78a407c593SHannes Reinecke rcu_read_unlock(); 7942e9a92fSRobert Love } 8042e9a92fSRobert Love 8142e9a92fSRobert Love /** 8234f42a07SRobert Love * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN) 8392261156SJoe Eykholt * @disc: The discovery object to which the RSCN applies 843a3b42bfSRobert Love * @fp: The RSCN frame 8542e9a92fSRobert Love */ 8692261156SJoe Eykholt static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp) 8742e9a92fSRobert Love { 8842e9a92fSRobert Love struct fc_lport *lport; 8942e9a92fSRobert Love struct fc_els_rscn *rp; 9042e9a92fSRobert Love struct fc_els_rscn_page *pp; 9142e9a92fSRobert Love struct fc_seq_els_data rjt_data; 9242e9a92fSRobert Love unsigned int len; 9342e9a92fSRobert Love int redisc = 0; 9442e9a92fSRobert Love enum fc_els_rscn_ev_qual ev_qual; 9542e9a92fSRobert Love enum fc_els_rscn_addr_fmt fmt; 9642e9a92fSRobert Love LIST_HEAD(disc_ports); 9742e9a92fSRobert Love struct fc_disc_port *dp, *next; 9842e9a92fSRobert Love 99ee35624eSHannes Reinecke lockdep_assert_held(&disc->disc_mutex); 100ee35624eSHannes Reinecke 1010685230cSJoe Eykholt lport = fc_disc_lport(disc); 10242e9a92fSRobert Love 1037414705eSRobert Love FC_DISC_DBG(disc, "Received an RSCN event\n"); 10442e9a92fSRobert Love 10542e9a92fSRobert Love /* make sure the frame contains an RSCN message */ 10642e9a92fSRobert Love rp = fc_frame_payload_get(fp, sizeof(*rp)); 10742e9a92fSRobert Love if (!rp) 10842e9a92fSRobert Love goto reject; 10942e9a92fSRobert Love /* make sure the page length is as expected (4 bytes) */ 11042e9a92fSRobert Love if (rp->rscn_page_len != sizeof(*pp)) 11142e9a92fSRobert Love goto reject; 11242e9a92fSRobert Love /* get the RSCN payload length */ 11342e9a92fSRobert Love len = ntohs(rp->rscn_plen); 11442e9a92fSRobert Love if (len < sizeof(*rp)) 11542e9a92fSRobert Love goto reject; 11642e9a92fSRobert Love /* make sure the frame contains the expected payload */ 11742e9a92fSRobert Love rp = fc_frame_payload_get(fp, len); 11842e9a92fSRobert Love if (!rp) 11942e9a92fSRobert Love goto reject; 12042e9a92fSRobert Love /* payload must be a multiple of the RSCN page size */ 12142e9a92fSRobert Love len -= sizeof(*rp); 12242e9a92fSRobert Love if (len % sizeof(*pp)) 12342e9a92fSRobert Love goto reject; 12442e9a92fSRobert Love 12542e9a92fSRobert Love for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) { 12642e9a92fSRobert Love ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT; 12742e9a92fSRobert Love ev_qual &= ELS_RSCN_EV_QUAL_MASK; 12842e9a92fSRobert Love fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT; 12942e9a92fSRobert Love fmt &= ELS_RSCN_ADDR_FMT_MASK; 13042e9a92fSRobert Love /* 13142e9a92fSRobert Love * if we get an address format other than port 13242e9a92fSRobert Love * (area, domain, fabric), then do a full discovery 13342e9a92fSRobert Love */ 13442e9a92fSRobert Love switch (fmt) { 13542e9a92fSRobert Love case ELS_ADDR_FMT_PORT: 1367414705eSRobert Love FC_DISC_DBG(disc, "Port address format for port " 137ce8b5df0SChris Leech "(%6.6x)\n", ntoh24(pp->rscn_fid)); 13842e9a92fSRobert Love dp = kzalloc(sizeof(*dp), GFP_KERNEL); 13942e9a92fSRobert Love if (!dp) { 14042e9a92fSRobert Love redisc = 1; 14142e9a92fSRobert Love break; 14242e9a92fSRobert Love } 14342e9a92fSRobert Love dp->lp = lport; 1449737e6a7SRobert Love dp->port_id = ntoh24(pp->rscn_fid); 14542e9a92fSRobert Love list_add_tail(&dp->peers, &disc_ports); 14642e9a92fSRobert Love break; 14742e9a92fSRobert Love case ELS_ADDR_FMT_AREA: 14842e9a92fSRobert Love case ELS_ADDR_FMT_DOM: 14942e9a92fSRobert Love case ELS_ADDR_FMT_FAB: 15042e9a92fSRobert Love default: 1517414705eSRobert Love FC_DISC_DBG(disc, "Address format is (%d)\n", fmt); 15242e9a92fSRobert Love redisc = 1; 15342e9a92fSRobert Love break; 15442e9a92fSRobert Love } 15542e9a92fSRobert Love } 1567ab24dd1SHannes Reinecke fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL); 1572ab7e1ecSJoe Eykholt 1582ab7e1ecSJoe Eykholt /* 1592ab7e1ecSJoe Eykholt * If not doing a complete rediscovery, do GPN_ID on 1602ab7e1ecSJoe Eykholt * the individual ports mentioned in the list. 1612ab7e1ecSJoe Eykholt * If any of these get an error, do a full rediscovery. 1622ab7e1ecSJoe Eykholt * In any case, go through the list and free the entries. 1632ab7e1ecSJoe Eykholt */ 1642ab7e1ecSJoe Eykholt list_for_each_entry_safe(dp, next, &disc_ports, peers) { 1652ab7e1ecSJoe Eykholt list_del(&dp->peers); 1662ab7e1ecSJoe Eykholt if (!redisc) 1672ab7e1ecSJoe Eykholt redisc = fc_disc_single(lport, dp); 1682ab7e1ecSJoe Eykholt kfree(dp); 1692ab7e1ecSJoe Eykholt } 17042e9a92fSRobert Love if (redisc) { 1717414705eSRobert Love FC_DISC_DBG(disc, "RSCN received: rediscovering\n"); 17242e9a92fSRobert Love fc_disc_restart(disc); 17342e9a92fSRobert Love } else { 1747414705eSRobert Love FC_DISC_DBG(disc, "RSCN received: not rediscovering. " 17542e9a92fSRobert Love "redisc %d state %d in_prog %d\n", 17642e9a92fSRobert Love redisc, lport->state, disc->pending); 17742e9a92fSRobert Love } 17842e9a92fSRobert Love fc_frame_free(fp); 17942e9a92fSRobert Love return; 18042e9a92fSRobert Love reject: 1817414705eSRobert Love FC_DISC_DBG(disc, "Received a bad RSCN frame\n"); 18242e9a92fSRobert Love rjt_data.reason = ELS_RJT_LOGIC; 18342e9a92fSRobert Love rjt_data.explan = ELS_EXPL_NONE; 1847ab24dd1SHannes Reinecke fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); 18542e9a92fSRobert Love fc_frame_free(fp); 18642e9a92fSRobert Love } 18742e9a92fSRobert Love 18842e9a92fSRobert Love /** 18934f42a07SRobert Love * fc_disc_recv_req() - Handle incoming requests 1903a3b42bfSRobert Love * @lport: The local port receiving the request 19192261156SJoe Eykholt * @fp: The request frame 19242e9a92fSRobert Love * 19342e9a92fSRobert Love * Locking Note: This function is called from the EM and will lock 19442e9a92fSRobert Love * the disc_mutex before calling the handler for the 19542e9a92fSRobert Love * request. 19642e9a92fSRobert Love */ 19792261156SJoe Eykholt static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp) 19842e9a92fSRobert Love { 19942e9a92fSRobert Love u8 op; 20042e9a92fSRobert Love struct fc_disc *disc = &lport->disc; 20142e9a92fSRobert Love 20242e9a92fSRobert Love op = fc_frame_payload_op(fp); 20342e9a92fSRobert Love switch (op) { 20442e9a92fSRobert Love case ELS_RSCN: 20542e9a92fSRobert Love mutex_lock(&disc->disc_mutex); 20692261156SJoe Eykholt fc_disc_recv_rscn_req(disc, fp); 20742e9a92fSRobert Love mutex_unlock(&disc->disc_mutex); 20842e9a92fSRobert Love break; 20942e9a92fSRobert Love default: 2107414705eSRobert Love FC_DISC_DBG(disc, "Received an unsupported request, " 2117414705eSRobert Love "the opcode is (%x)\n", op); 21283383dd1SHillf Danton fc_frame_free(fp); 21342e9a92fSRobert Love break; 21442e9a92fSRobert Love } 21542e9a92fSRobert Love } 21642e9a92fSRobert Love 21742e9a92fSRobert Love /** 21834f42a07SRobert Love * fc_disc_restart() - Restart discovery 2193a3b42bfSRobert Love * @disc: The discovery object to be restarted 22042e9a92fSRobert Love */ 22142e9a92fSRobert Love static void fc_disc_restart(struct fc_disc *disc) 22242e9a92fSRobert Love { 223ee35624eSHannes Reinecke lockdep_assert_held(&disc->disc_mutex); 224ee35624eSHannes Reinecke 225935d0fceSJoe Eykholt if (!disc->disc_callback) 226935d0fceSJoe Eykholt return; 227935d0fceSJoe Eykholt 2287414705eSRobert Love FC_DISC_DBG(disc, "Restarting discovery\n"); 22942e9a92fSRobert Love 23042e9a92fSRobert Love disc->requested = 1; 2310f6c6149SJoe Eykholt if (disc->pending) 2320f6c6149SJoe Eykholt return; 2330f6c6149SJoe Eykholt 2340f6c6149SJoe Eykholt /* 2350f6c6149SJoe Eykholt * Advance disc_id. This is an arbitrary non-zero number that will 2360f6c6149SJoe Eykholt * match the value in the fc_rport_priv after discovery for all 2370f6c6149SJoe Eykholt * freshly-discovered remote ports. Avoid wrapping to zero. 2380f6c6149SJoe Eykholt */ 2390f6c6149SJoe Eykholt disc->disc_id = (disc->disc_id + 2) | 1; 2403667d7e7SJoe Eykholt disc->retry_count = 0; 24142e9a92fSRobert Love fc_disc_gpn_ft_req(disc); 24242e9a92fSRobert Love } 24342e9a92fSRobert Love 24442e9a92fSRobert Love /** 2453a3b42bfSRobert Love * fc_disc_start() - Start discovery on a local port 2463a3b42bfSRobert Love * @lport: The local port to have discovery started on 2473a3b42bfSRobert Love * @disc_callback: Callback function to be called when discovery is complete 24842e9a92fSRobert Love */ 24942e9a92fSRobert Love static void fc_disc_start(void (*disc_callback)(struct fc_lport *, 25042e9a92fSRobert Love enum fc_disc_event), 25142e9a92fSRobert Love struct fc_lport *lport) 25242e9a92fSRobert Love { 25342e9a92fSRobert Love struct fc_disc *disc = &lport->disc; 25442e9a92fSRobert Love 25542e9a92fSRobert Love /* 25642e9a92fSRobert Love * At this point we may have a new disc job or an existing 25742e9a92fSRobert Love * one. Either way, let's lock when we make changes to it 25842e9a92fSRobert Love * and send the GPN_FT request. 25942e9a92fSRobert Love */ 26042e9a92fSRobert Love mutex_lock(&disc->disc_mutex); 26142e9a92fSRobert Love disc->disc_callback = disc_callback; 26229d898e9SJoe Eykholt fc_disc_restart(disc); 26342e9a92fSRobert Love mutex_unlock(&disc->disc_mutex); 26442e9a92fSRobert Love } 26542e9a92fSRobert Love 26642e9a92fSRobert Love /** 26734f42a07SRobert Love * fc_disc_done() - Discovery has been completed 2683a3b42bfSRobert Love * @disc: The discovery context 2693a3b42bfSRobert Love * @event: The discovery completion status 27042e9a92fSRobert Love */ 271786681b9SJoe Eykholt static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event) 27242e9a92fSRobert Love { 2730685230cSJoe Eykholt struct fc_lport *lport = fc_disc_lport(disc); 2740f6c6149SJoe Eykholt struct fc_rport_priv *rdata; 27542e9a92fSRobert Love 276ee35624eSHannes Reinecke lockdep_assert_held(&disc->disc_mutex); 2777414705eSRobert Love FC_DISC_DBG(disc, "Discovery complete\n"); 27842e9a92fSRobert Love 27942e9a92fSRobert Love disc->pending = 0; 2800f6c6149SJoe Eykholt if (disc->requested) { 2810f6c6149SJoe Eykholt fc_disc_restart(disc); 2820f6c6149SJoe Eykholt return; 2830f6c6149SJoe Eykholt } 2840f6c6149SJoe Eykholt 2850f6c6149SJoe Eykholt /* 2860f6c6149SJoe Eykholt * Go through all remote ports. If they were found in the latest 2870f6c6149SJoe Eykholt * discovery, reverify or log them in. Otherwise, log them out. 2880f6c6149SJoe Eykholt * Skip ports which were never discovered. These are the dNS port 2890f6c6149SJoe Eykholt * and ports which were created by PLOGI. 2900f6c6149SJoe Eykholt */ 291a407c593SHannes Reinecke rcu_read_lock(); 29242e90414SJoe Eykholt list_for_each_entry_rcu(rdata, &disc->rports, peers) { 293a407c593SHannes Reinecke if (!kref_get_unless_zero(&rdata->kref)) 2940f6c6149SJoe Eykholt continue; 295a407c593SHannes Reinecke if (rdata->disc_id) { 2960f6c6149SJoe Eykholt if (rdata->disc_id == disc->disc_id) 29705d7d3b0SHannes Reinecke fc_rport_login(rdata); 2980f6c6149SJoe Eykholt else 299c96c792aSHannes Reinecke fc_rport_logoff(rdata); 3000f6c6149SJoe Eykholt } 301944ef968SHannes Reinecke kref_put(&rdata->kref, fc_rport_destroy); 302a407c593SHannes Reinecke } 303a407c593SHannes Reinecke rcu_read_unlock(); 3040d228c0fSAbhijeet Joglekar mutex_unlock(&disc->disc_mutex); 3050d228c0fSAbhijeet Joglekar disc->disc_callback(lport, event); 3060d228c0fSAbhijeet Joglekar mutex_lock(&disc->disc_mutex); 30742e9a92fSRobert Love } 30842e9a92fSRobert Love 30942e9a92fSRobert Love /** 31034f42a07SRobert Love * fc_disc_error() - Handle error on dNS request 3113a3b42bfSRobert Love * @disc: The discovery context 3123a3b42bfSRobert Love * @fp: The error code encoded as a frame pointer 31342e9a92fSRobert Love */ 31442e9a92fSRobert Love static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp) 31542e9a92fSRobert Love { 3160685230cSJoe Eykholt struct fc_lport *lport = fc_disc_lport(disc); 31742e9a92fSRobert Love unsigned long delay = 0; 3187414705eSRobert Love 3197414705eSRobert Love FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n", 32042e9a92fSRobert Love PTR_ERR(fp), disc->retry_count, 32142e9a92fSRobert Love FC_DISC_RETRY_LIMIT); 32242e9a92fSRobert Love 32342e9a92fSRobert Love if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { 32442e9a92fSRobert Love /* 32542e9a92fSRobert Love * Memory allocation failure, or the exchange timed out, 32642e9a92fSRobert Love * retry after delay. 32742e9a92fSRobert Love */ 32842e9a92fSRobert Love if (disc->retry_count < FC_DISC_RETRY_LIMIT) { 32942e9a92fSRobert Love /* go ahead and retry */ 33042e9a92fSRobert Love if (!fp) 33142e9a92fSRobert Love delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY); 33242e9a92fSRobert Love else { 33342e9a92fSRobert Love delay = msecs_to_jiffies(lport->e_d_tov); 33442e9a92fSRobert Love 33542e9a92fSRobert Love /* timeout faster first time */ 33642e9a92fSRobert Love if (!disc->retry_count) 33742e9a92fSRobert Love delay /= 4; 33842e9a92fSRobert Love } 33942e9a92fSRobert Love disc->retry_count++; 34042e9a92fSRobert Love schedule_delayed_work(&disc->disc_work, delay); 341786681b9SJoe Eykholt } else 342786681b9SJoe Eykholt fc_disc_done(disc, DISC_EV_FAILED); 34300832084SBhanu Prakash Gollapudi } else if (PTR_ERR(fp) == -FC_EX_CLOSED) { 34400832084SBhanu Prakash Gollapudi /* 34500832084SBhanu Prakash Gollapudi * if discovery fails due to lport reset, clear 34600832084SBhanu Prakash Gollapudi * pending flag so that subsequent discovery can 34700832084SBhanu Prakash Gollapudi * continue 34800832084SBhanu Prakash Gollapudi */ 34900832084SBhanu Prakash Gollapudi disc->pending = 0; 35042e9a92fSRobert Love } 35142e9a92fSRobert Love } 35242e9a92fSRobert Love 35342e9a92fSRobert Love /** 35434f42a07SRobert Love * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request 3553a3b42bfSRobert Love * @lport: The discovery context 35642e9a92fSRobert Love */ 35742e9a92fSRobert Love static void fc_disc_gpn_ft_req(struct fc_disc *disc) 35842e9a92fSRobert Love { 35942e9a92fSRobert Love struct fc_frame *fp; 3600685230cSJoe Eykholt struct fc_lport *lport = fc_disc_lport(disc); 36142e9a92fSRobert Love 362ee35624eSHannes Reinecke lockdep_assert_held(&disc->disc_mutex); 363ee35624eSHannes Reinecke 36442e9a92fSRobert Love WARN_ON(!fc_lport_test_ready(lport)); 36542e9a92fSRobert Love 36642e9a92fSRobert Love disc->pending = 1; 36742e9a92fSRobert Love disc->requested = 0; 36842e9a92fSRobert Love 36942e9a92fSRobert Love disc->buf_len = 0; 37042e9a92fSRobert Love disc->seq_count = 0; 37142e9a92fSRobert Love fp = fc_frame_alloc(lport, 37242e9a92fSRobert Love sizeof(struct fc_ct_hdr) + 37342e9a92fSRobert Love sizeof(struct fc_ns_gid_ft)); 37442e9a92fSRobert Love if (!fp) 37542e9a92fSRobert Love goto err; 37642e9a92fSRobert Love 377a46f327aSJoe Eykholt if (lport->tt.elsct_send(lport, 0, fp, 37842e9a92fSRobert Love FC_NS_GPN_FT, 37942e9a92fSRobert Love fc_disc_gpn_ft_resp, 380b94f8951SJoe Eykholt disc, 3 * lport->r_a_tov)) 38142e9a92fSRobert Love return; 38242e9a92fSRobert Love err: 3838f550f93SChris Leech fc_disc_error(disc, NULL); 38442e9a92fSRobert Love } 38542e9a92fSRobert Love 38642e9a92fSRobert Love /** 387786681b9SJoe Eykholt * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response. 3883a3b42bfSRobert Love * @lport: The local port the GPN_FT was received on 3893a3b42bfSRobert Love * @buf: The GPN_FT response buffer 3903a3b42bfSRobert Love * @len: The size of response buffer 391786681b9SJoe Eykholt * 392786681b9SJoe Eykholt * Goes through the list of IDs and names resulting from a request. 39342e9a92fSRobert Love */ 39442e9a92fSRobert Love static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len) 39542e9a92fSRobert Love { 39642e9a92fSRobert Love struct fc_lport *lport; 39742e9a92fSRobert Love struct fc_gpn_ft_resp *np; 39842e9a92fSRobert Love char *bp; 39942e9a92fSRobert Love size_t plen; 40042e9a92fSRobert Love size_t tlen; 40142e9a92fSRobert Love int error = 0; 402795d86f5SJoe Eykholt struct fc_rport_identifiers ids; 403ab28f1fdSJoe Eykholt struct fc_rport_priv *rdata; 40442e9a92fSRobert Love 4050685230cSJoe Eykholt lport = fc_disc_lport(disc); 406a1c1e4e7SJoe Eykholt disc->seq_count++; 40742e9a92fSRobert Love 40842e9a92fSRobert Love /* 40942e9a92fSRobert Love * Handle partial name record left over from previous call. 41042e9a92fSRobert Love */ 41142e9a92fSRobert Love bp = buf; 41242e9a92fSRobert Love plen = len; 41342e9a92fSRobert Love np = (struct fc_gpn_ft_resp *)bp; 41442e9a92fSRobert Love tlen = disc->buf_len; 41581a67b97SJoe Eykholt disc->buf_len = 0; 41642e9a92fSRobert Love if (tlen) { 41742e9a92fSRobert Love WARN_ON(tlen >= sizeof(*np)); 41842e9a92fSRobert Love plen = sizeof(*np) - tlen; 41942e9a92fSRobert Love WARN_ON(plen <= 0); 42042e9a92fSRobert Love WARN_ON(plen >= sizeof(*np)); 42142e9a92fSRobert Love if (plen > len) 42242e9a92fSRobert Love plen = len; 42342e9a92fSRobert Love np = &disc->partial_buf; 42442e9a92fSRobert Love memcpy((char *)np + tlen, bp, plen); 42542e9a92fSRobert Love 42642e9a92fSRobert Love /* 42742e9a92fSRobert Love * Set bp so that the loop below will advance it to the 42842e9a92fSRobert Love * first valid full name element. 42942e9a92fSRobert Love */ 43042e9a92fSRobert Love bp -= tlen; 43142e9a92fSRobert Love len += tlen; 43242e9a92fSRobert Love plen += tlen; 43342e9a92fSRobert Love disc->buf_len = (unsigned char) plen; 43442e9a92fSRobert Love if (plen == sizeof(*np)) 43542e9a92fSRobert Love disc->buf_len = 0; 43642e9a92fSRobert Love } 43742e9a92fSRobert Love 43842e9a92fSRobert Love /* 43942e9a92fSRobert Love * Handle full name records, including the one filled from above. 44042e9a92fSRobert Love * Normally, np == bp and plen == len, but from the partial case above, 44142e9a92fSRobert Love * bp, len describe the overall buffer, and np, plen describe the 44242e9a92fSRobert Love * partial buffer, which if would usually be full now. 44342e9a92fSRobert Love * After the first time through the loop, things return to "normal". 44442e9a92fSRobert Love */ 44542e9a92fSRobert Love while (plen >= sizeof(*np)) { 446795d86f5SJoe Eykholt ids.port_id = ntoh24(np->fp_fid); 447795d86f5SJoe Eykholt ids.port_name = ntohll(np->fp_wwpn); 44842e9a92fSRobert Love 4497b2787ecSRobert Love if (ids.port_id != lport->port_id && 450795d86f5SJoe Eykholt ids.port_name != lport->wwpn) { 4512580064bSHannes Reinecke rdata = fc_rport_create(lport, ids.port_id); 4529737e6a7SRobert Love if (rdata) { 4539737e6a7SRobert Love rdata->ids.port_name = ids.port_name; 4540f6c6149SJoe Eykholt rdata->disc_id = disc->disc_id; 4559737e6a7SRobert Love } else { 4567414705eSRobert Love printk(KERN_WARNING "libfc: Failed to allocate " 4577414705eSRobert Love "memory for the newly discovered port " 458ce8b5df0SChris Leech "(%6.6x)\n", ids.port_id); 45981a67b97SJoe Eykholt error = -ENOMEM; 46081a67b97SJoe Eykholt } 46142e9a92fSRobert Love } 46242e9a92fSRobert Love 46342e9a92fSRobert Love if (np->fp_flags & FC_NS_FID_LAST) { 464786681b9SJoe Eykholt fc_disc_done(disc, DISC_EV_SUCCESS); 46542e9a92fSRobert Love len = 0; 46642e9a92fSRobert Love break; 46742e9a92fSRobert Love } 46842e9a92fSRobert Love len -= sizeof(*np); 46942e9a92fSRobert Love bp += sizeof(*np); 47042e9a92fSRobert Love np = (struct fc_gpn_ft_resp *)bp; 47142e9a92fSRobert Love plen = len; 47242e9a92fSRobert Love } 47342e9a92fSRobert Love 47442e9a92fSRobert Love /* 47542e9a92fSRobert Love * Save any partial record at the end of the buffer for next time. 47642e9a92fSRobert Love */ 47742e9a92fSRobert Love if (error == 0 && len > 0 && len < sizeof(*np)) { 47842e9a92fSRobert Love if (np != &disc->partial_buf) { 4797414705eSRobert Love FC_DISC_DBG(disc, "Partial buffer remains " 4807414705eSRobert Love "for discovery\n"); 48142e9a92fSRobert Love memcpy(&disc->partial_buf, np, len); 48242e9a92fSRobert Love } 48342e9a92fSRobert Love disc->buf_len = (unsigned char) len; 48442e9a92fSRobert Love } 48542e9a92fSRobert Love return error; 48642e9a92fSRobert Love } 48742e9a92fSRobert Love 48834f42a07SRobert Love /** 4893a3b42bfSRobert Love * fc_disc_timeout() - Handler for discovery timeouts 4903a3b42bfSRobert Love * @work: Structure holding discovery context that needs to retry discovery 49142e9a92fSRobert Love */ 49242e9a92fSRobert Love static void fc_disc_timeout(struct work_struct *work) 49342e9a92fSRobert Love { 49442e9a92fSRobert Love struct fc_disc *disc = container_of(work, 49542e9a92fSRobert Love struct fc_disc, 49642e9a92fSRobert Love disc_work.work); 49742e9a92fSRobert Love mutex_lock(&disc->disc_mutex); 49842e9a92fSRobert Love fc_disc_gpn_ft_req(disc); 49942e9a92fSRobert Love mutex_unlock(&disc->disc_mutex); 50042e9a92fSRobert Love } 50142e9a92fSRobert Love 50242e9a92fSRobert Love /** 50334f42a07SRobert Love * fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT) 5043a3b42bfSRobert Love * @sp: The sequence that the GPN_FT response was received on 5053a3b42bfSRobert Love * @fp: The GPN_FT response frame 5063a3b42bfSRobert Love * @lp_arg: The discovery context 50742e9a92fSRobert Love * 5080d228c0fSAbhijeet Joglekar * Locking Note: This function is called without disc mutex held, and 5090d228c0fSAbhijeet Joglekar * should do all its processing with the mutex held 51042e9a92fSRobert Love */ 51142e9a92fSRobert Love static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp, 51242e9a92fSRobert Love void *disc_arg) 51342e9a92fSRobert Love { 51442e9a92fSRobert Love struct fc_disc *disc = disc_arg; 51542e9a92fSRobert Love struct fc_ct_hdr *cp; 51642e9a92fSRobert Love struct fc_frame_header *fh; 517a1c1e4e7SJoe Eykholt enum fc_disc_event event = DISC_EV_NONE; 51842e9a92fSRobert Love unsigned int seq_cnt; 51942e9a92fSRobert Love unsigned int len; 520a1c1e4e7SJoe Eykholt int error = 0; 52142e9a92fSRobert Love 5220d228c0fSAbhijeet Joglekar mutex_lock(&disc->disc_mutex); 5237414705eSRobert Love FC_DISC_DBG(disc, "Received a GPN_FT response\n"); 52442e9a92fSRobert Love 52542e9a92fSRobert Love if (IS_ERR(fp)) { 52642e9a92fSRobert Love fc_disc_error(disc, fp); 5270d228c0fSAbhijeet Joglekar mutex_unlock(&disc->disc_mutex); 52842e9a92fSRobert Love return; 52942e9a92fSRobert Love } 53042e9a92fSRobert Love 53142e9a92fSRobert Love WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */ 53242e9a92fSRobert Love fh = fc_frame_header_get(fp); 53342e9a92fSRobert Love len = fr_len(fp) - sizeof(*fh); 53442e9a92fSRobert Love seq_cnt = ntohs(fh->fh_seq_cnt); 535a1c1e4e7SJoe Eykholt if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) { 53642e9a92fSRobert Love cp = fc_frame_payload_get(fp, sizeof(*cp)); 53742e9a92fSRobert Love if (!cp) { 5387414705eSRobert Love FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n", 53942e9a92fSRobert Love fr_len(fp)); 540883a337cSJoe Eykholt event = DISC_EV_FAILED; 54142e9a92fSRobert Love } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) { 54242e9a92fSRobert Love 54334f42a07SRobert Love /* Accepted, parse the response. */ 54442e9a92fSRobert Love len -= sizeof(*cp); 545a1c1e4e7SJoe Eykholt error = fc_disc_gpn_ft_parse(disc, cp + 1, len); 54642e9a92fSRobert Love } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { 5477414705eSRobert Love FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x " 54842e9a92fSRobert Love "(check zoning)\n", cp->ct_reason, 54942e9a92fSRobert Love cp->ct_explan); 550a1c1e4e7SJoe Eykholt event = DISC_EV_FAILED; 551c762608bSJoe Eykholt if (cp->ct_reason == FC_FS_RJT_UNABL && 552c762608bSJoe Eykholt cp->ct_explan == FC_FS_EXP_FTNR) 553c762608bSJoe Eykholt event = DISC_EV_SUCCESS; 55442e9a92fSRobert Love } else { 5557414705eSRobert Love FC_DISC_DBG(disc, "GPN_FT unexpected response code " 5567414705eSRobert Love "%x\n", ntohs(cp->ct_cmd)); 557883a337cSJoe Eykholt event = DISC_EV_FAILED; 55842e9a92fSRobert Love } 559a1c1e4e7SJoe Eykholt } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) { 560a1c1e4e7SJoe Eykholt error = fc_disc_gpn_ft_parse(disc, fh + 1, len); 56142e9a92fSRobert Love } else { 5627414705eSRobert Love FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? " 56342e9a92fSRobert Love "seq_cnt %x expected %x sof %x eof %x\n", 56442e9a92fSRobert Love seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp)); 565883a337cSJoe Eykholt event = DISC_EV_FAILED; 56642e9a92fSRobert Love } 56742e9a92fSRobert Love if (error) 5686f37e210SDan Carpenter fc_disc_error(disc, ERR_PTR(error)); 569a1c1e4e7SJoe Eykholt else if (event != DISC_EV_NONE) 570a1c1e4e7SJoe Eykholt fc_disc_done(disc, event); 57142e9a92fSRobert Love fc_frame_free(fp); 5720d228c0fSAbhijeet Joglekar mutex_unlock(&disc->disc_mutex); 57342e9a92fSRobert Love } 57442e9a92fSRobert Love 57542e9a92fSRobert Love /** 5762ab7e1ecSJoe Eykholt * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID) 5773a3b42bfSRobert Love * @sp: The sequence the GPN_ID is on 5783a3b42bfSRobert Love * @fp: The response frame 5793a3b42bfSRobert Love * @rdata_arg: The remote port that sent the GPN_ID response 5802ab7e1ecSJoe Eykholt * 5812ab7e1ecSJoe Eykholt * Locking Note: This function is called without disc mutex held. 5822ab7e1ecSJoe Eykholt */ 5832ab7e1ecSJoe Eykholt static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, 5842ab7e1ecSJoe Eykholt void *rdata_arg) 5852ab7e1ecSJoe Eykholt { 5862ab7e1ecSJoe Eykholt struct fc_rport_priv *rdata = rdata_arg; 5872ab7e1ecSJoe Eykholt struct fc_rport_priv *new_rdata; 5882ab7e1ecSJoe Eykholt struct fc_lport *lport; 5892ab7e1ecSJoe Eykholt struct fc_disc *disc; 5902ab7e1ecSJoe Eykholt struct fc_ct_hdr *cp; 5912ab7e1ecSJoe Eykholt struct fc_ns_gid_pn *pn; 5922ab7e1ecSJoe Eykholt u64 port_name; 5932ab7e1ecSJoe Eykholt 5942ab7e1ecSJoe Eykholt lport = rdata->local_port; 5952ab7e1ecSJoe Eykholt disc = &lport->disc; 5962ab7e1ecSJoe Eykholt 5972ab7e1ecSJoe Eykholt if (PTR_ERR(fp) == -FC_EX_CLOSED) 5982ab7e1ecSJoe Eykholt goto out; 5992ab7e1ecSJoe Eykholt if (IS_ERR(fp)) 6002ab7e1ecSJoe Eykholt goto redisc; 6012ab7e1ecSJoe Eykholt 6022ab7e1ecSJoe Eykholt cp = fc_frame_payload_get(fp, sizeof(*cp)); 6032ab7e1ecSJoe Eykholt if (!cp) 6042ab7e1ecSJoe Eykholt goto redisc; 6052ab7e1ecSJoe Eykholt if (ntohs(cp->ct_cmd) == FC_FS_ACC) { 6062ab7e1ecSJoe Eykholt if (fr_len(fp) < sizeof(struct fc_frame_header) + 6072ab7e1ecSJoe Eykholt sizeof(*cp) + sizeof(*pn)) 6082ab7e1ecSJoe Eykholt goto redisc; 6092ab7e1ecSJoe Eykholt pn = (struct fc_ns_gid_pn *)(cp + 1); 6102ab7e1ecSJoe Eykholt port_name = get_unaligned_be64(&pn->fn_wwpn); 611a407c593SHannes Reinecke mutex_lock(&rdata->rp_mutex); 6122ab7e1ecSJoe Eykholt if (rdata->ids.port_name == -1) 6132ab7e1ecSJoe Eykholt rdata->ids.port_name = port_name; 6142ab7e1ecSJoe Eykholt else if (rdata->ids.port_name != port_name) { 6152ab7e1ecSJoe Eykholt FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. " 6169f8f3aa6SChris Leech "Port-id %6.6x wwpn %16.16llx\n", 6172ab7e1ecSJoe Eykholt rdata->ids.port_id, port_name); 618a407c593SHannes Reinecke mutex_unlock(&rdata->rp_mutex); 619c96c792aSHannes Reinecke fc_rport_logoff(rdata); 620a407c593SHannes Reinecke mutex_lock(&lport->disc.disc_mutex); 6212580064bSHannes Reinecke new_rdata = fc_rport_create(lport, rdata->ids.port_id); 622a407c593SHannes Reinecke mutex_unlock(&lport->disc.disc_mutex); 6232ab7e1ecSJoe Eykholt if (new_rdata) { 6242ab7e1ecSJoe Eykholt new_rdata->disc_id = disc->disc_id; 62505d7d3b0SHannes Reinecke fc_rport_login(new_rdata); 6262ab7e1ecSJoe Eykholt } 6272ab7e1ecSJoe Eykholt goto out; 6282ab7e1ecSJoe Eykholt } 6292ab7e1ecSJoe Eykholt rdata->disc_id = disc->disc_id; 630a407c593SHannes Reinecke mutex_unlock(&rdata->rp_mutex); 63105d7d3b0SHannes Reinecke fc_rport_login(rdata); 6322ab7e1ecSJoe Eykholt } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { 6332ab7e1ecSJoe Eykholt FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n", 6342ab7e1ecSJoe Eykholt cp->ct_reason, cp->ct_explan); 635c96c792aSHannes Reinecke fc_rport_logoff(rdata); 6362ab7e1ecSJoe Eykholt } else { 6372ab7e1ecSJoe Eykholt FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n", 6382ab7e1ecSJoe Eykholt ntohs(cp->ct_cmd)); 6392ab7e1ecSJoe Eykholt redisc: 640a407c593SHannes Reinecke mutex_lock(&disc->disc_mutex); 6412ab7e1ecSJoe Eykholt fc_disc_restart(disc); 642a407c593SHannes Reinecke mutex_unlock(&disc->disc_mutex); 6432ab7e1ecSJoe Eykholt } 6442ab7e1ecSJoe Eykholt out: 645944ef968SHannes Reinecke kref_put(&rdata->kref, fc_rport_destroy); 6462ab7e1ecSJoe Eykholt } 6472ab7e1ecSJoe Eykholt 6482ab7e1ecSJoe Eykholt /** 6492ab7e1ecSJoe Eykholt * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request 6503a3b42bfSRobert Love * @lport: The local port to initiate discovery on 6512ab7e1ecSJoe Eykholt * @rdata: remote port private data 6522ab7e1ecSJoe Eykholt * 6532ab7e1ecSJoe Eykholt * On failure, an error code is returned. 6542ab7e1ecSJoe Eykholt */ 6552ab7e1ecSJoe Eykholt static int fc_disc_gpn_id_req(struct fc_lport *lport, 6562ab7e1ecSJoe Eykholt struct fc_rport_priv *rdata) 6572ab7e1ecSJoe Eykholt { 6582ab7e1ecSJoe Eykholt struct fc_frame *fp; 6592ab7e1ecSJoe Eykholt 660ee35624eSHannes Reinecke lockdep_assert_held(&lport->disc.disc_mutex); 6612ab7e1ecSJoe Eykholt fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + 6622ab7e1ecSJoe Eykholt sizeof(struct fc_ns_fid)); 6632ab7e1ecSJoe Eykholt if (!fp) 6642ab7e1ecSJoe Eykholt return -ENOMEM; 6652ab7e1ecSJoe Eykholt if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID, 666b94f8951SJoe Eykholt fc_disc_gpn_id_resp, rdata, 667b94f8951SJoe Eykholt 3 * lport->r_a_tov)) 6682ab7e1ecSJoe Eykholt return -ENOMEM; 6692ab7e1ecSJoe Eykholt kref_get(&rdata->kref); 6702ab7e1ecSJoe Eykholt return 0; 6712ab7e1ecSJoe Eykholt } 6722ab7e1ecSJoe Eykholt 6732ab7e1ecSJoe Eykholt /** 67434f42a07SRobert Love * fc_disc_single() - Discover the directory information for a single target 6753a3b42bfSRobert Love * @lport: The local port the remote port is associated with 67642e9a92fSRobert Love * @dp: The port to rediscover 67742e9a92fSRobert Love */ 6782ab7e1ecSJoe Eykholt static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp) 67942e9a92fSRobert Love { 680ab28f1fdSJoe Eykholt struct fc_rport_priv *rdata; 68142e9a92fSRobert Love 682ee35624eSHannes Reinecke lockdep_assert_held(&lport->disc.disc_mutex); 683ee35624eSHannes Reinecke 6842580064bSHannes Reinecke rdata = fc_rport_create(lport, dp->port_id); 6852ab7e1ecSJoe Eykholt if (!rdata) 6862ab7e1ecSJoe Eykholt return -ENOMEM; 6872ab7e1ecSJoe Eykholt rdata->disc_id = 0; 6882ab7e1ecSJoe Eykholt return fc_disc_gpn_id_req(lport, rdata); 68942e9a92fSRobert Love } 69042e9a92fSRobert Love 69142e9a92fSRobert Love /** 69234f42a07SRobert Love * fc_disc_stop() - Stop discovery for a given lport 6933a3b42bfSRobert Love * @lport: The local port that discovery should stop on 69442e9a92fSRobert Love */ 695c6b21c93SBart Van Assche static void fc_disc_stop(struct fc_lport *lport) 69642e9a92fSRobert Love { 69742e9a92fSRobert Love struct fc_disc *disc = &lport->disc; 69842e9a92fSRobert Love 699c531b9b4SBhanu Prakash Gollapudi if (disc->pending) 70042e9a92fSRobert Love cancel_delayed_work_sync(&disc->disc_work); 70142e9a92fSRobert Love fc_disc_stop_rports(disc); 70242e9a92fSRobert Love } 70342e9a92fSRobert Love 70442e9a92fSRobert Love /** 70534f42a07SRobert Love * fc_disc_stop_final() - Stop discovery for a given lport 7063a3b42bfSRobert Love * @lport: The lport that discovery should stop on 70742e9a92fSRobert Love * 70842e9a92fSRobert Love * This function will block until discovery has been 70942e9a92fSRobert Love * completely stopped and all rports have been deleted. 71042e9a92fSRobert Love */ 711c6b21c93SBart Van Assche static void fc_disc_stop_final(struct fc_lport *lport) 71242e9a92fSRobert Love { 71342e9a92fSRobert Love fc_disc_stop(lport); 7145922a957SHannes Reinecke fc_rport_flush_queue(); 71542e9a92fSRobert Love } 71642e9a92fSRobert Love 71742e9a92fSRobert Love /** 7180807619dSRobert Love * fc_disc_config() - Configure the discovery layer for a local port 7190807619dSRobert Love * @lport: The local port that needs the discovery layer to be configured 7208a9a7138SRobert Love * @priv: Private data structre for users of the discovery layer 72142e9a92fSRobert Love */ 7220807619dSRobert Love void fc_disc_config(struct fc_lport *lport, void *priv) 72342e9a92fSRobert Love { 724bc2e1299SColin Ian King struct fc_disc *disc; 72542e9a92fSRobert Love 72642e9a92fSRobert Love if (!lport->tt.disc_start) 72742e9a92fSRobert Love lport->tt.disc_start = fc_disc_start; 72842e9a92fSRobert Love 72942e9a92fSRobert Love if (!lport->tt.disc_stop) 73042e9a92fSRobert Love lport->tt.disc_stop = fc_disc_stop; 73142e9a92fSRobert Love 73242e9a92fSRobert Love if (!lport->tt.disc_stop_final) 73342e9a92fSRobert Love lport->tt.disc_stop_final = fc_disc_stop_final; 73442e9a92fSRobert Love 73542e9a92fSRobert Love if (!lport->tt.disc_recv_req) 73642e9a92fSRobert Love lport->tt.disc_recv_req = fc_disc_recv_req; 73742e9a92fSRobert Love 73842e9a92fSRobert Love disc = &lport->disc; 7390807619dSRobert Love 7400807619dSRobert Love disc->priv = priv; 7410807619dSRobert Love } 7420807619dSRobert Love EXPORT_SYMBOL(fc_disc_config); 7430807619dSRobert Love 7440807619dSRobert Love /** 7450807619dSRobert Love * fc_disc_init() - Initialize the discovery layer for a local port 7460807619dSRobert Love * @lport: The local port that needs the discovery layer to be initialized 7470807619dSRobert Love */ 7480807619dSRobert Love void fc_disc_init(struct fc_lport *lport) 7490807619dSRobert Love { 7500807619dSRobert Love struct fc_disc *disc = &lport->disc; 7510807619dSRobert Love 75242e9a92fSRobert Love INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout); 75342e9a92fSRobert Love mutex_init(&disc->disc_mutex); 75442e9a92fSRobert Love INIT_LIST_HEAD(&disc->rports); 75542e9a92fSRobert Love } 75642e9a92fSRobert Love EXPORT_SYMBOL(fc_disc_init); 757