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> 3942e9a92fSRobert Love #include <asm/unaligned.h> 4042e9a92fSRobert Love 4142e9a92fSRobert Love #include <scsi/fc/fc_gs.h> 4242e9a92fSRobert Love 4342e9a92fSRobert Love #include <scsi/libfc.h> 4442e9a92fSRobert Love 458866a5d9SRobert Love #include "fc_libfc.h" 468866a5d9SRobert Love 4742e9a92fSRobert Love #define FC_DISC_RETRY_LIMIT 3 /* max retries */ 4842e9a92fSRobert Love #define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ 4942e9a92fSRobert Love 5042e9a92fSRobert Love static void fc_disc_gpn_ft_req(struct fc_disc *); 5142e9a92fSRobert Love static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *); 52786681b9SJoe Eykholt static void fc_disc_done(struct fc_disc *, enum fc_disc_event); 5342e9a92fSRobert Love static void fc_disc_timeout(struct work_struct *); 542ab7e1ecSJoe Eykholt static int fc_disc_single(struct fc_lport *, struct fc_disc_port *); 5542e9a92fSRobert Love static void fc_disc_restart(struct fc_disc *); 5642e9a92fSRobert Love 5742e9a92fSRobert Love /** 583a3b42bfSRobert Love * fc_disc_stop_rports() - Delete all the remote ports associated with the lport 593a3b42bfSRobert Love * @disc: The discovery job to stop remote ports on 6042e9a92fSRobert Love * 6142e9a92fSRobert Love * Locking Note: This function expects that the lport mutex is locked before 6242e9a92fSRobert Love * calling it. 6342e9a92fSRobert Love */ 64c6b21c93SBart Van Assche static void fc_disc_stop_rports(struct fc_disc *disc) 6542e9a92fSRobert Love { 6642e9a92fSRobert Love struct fc_lport *lport; 6742e90414SJoe Eykholt struct fc_rport_priv *rdata; 6842e9a92fSRobert Love 690685230cSJoe Eykholt lport = fc_disc_lport(disc); 7042e9a92fSRobert Love 7142e9a92fSRobert Love mutex_lock(&disc->disc_mutex); 7242e90414SJoe Eykholt list_for_each_entry_rcu(rdata, &disc->rports, peers) 739fb9d328SJoe Eykholt lport->tt.rport_logoff(rdata); 7442e9a92fSRobert Love mutex_unlock(&disc->disc_mutex); 7542e9a92fSRobert Love } 7642e9a92fSRobert Love 7742e9a92fSRobert Love /** 7834f42a07SRobert Love * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN) 7992261156SJoe Eykholt * @disc: The discovery object to which the RSCN applies 803a3b42bfSRobert Love * @fp: The RSCN frame 8142e9a92fSRobert Love * 8242e9a92fSRobert Love * Locking Note: This function expects that the disc_mutex is locked 8342e9a92fSRobert Love * before it is called. 8442e9a92fSRobert Love */ 8592261156SJoe Eykholt static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp) 8642e9a92fSRobert Love { 8742e9a92fSRobert Love struct fc_lport *lport; 8842e9a92fSRobert Love struct fc_els_rscn *rp; 8942e9a92fSRobert Love struct fc_els_rscn_page *pp; 9042e9a92fSRobert Love struct fc_seq_els_data rjt_data; 9142e9a92fSRobert Love unsigned int len; 9242e9a92fSRobert Love int redisc = 0; 9342e9a92fSRobert Love enum fc_els_rscn_ev_qual ev_qual; 9442e9a92fSRobert Love enum fc_els_rscn_addr_fmt fmt; 9542e9a92fSRobert Love LIST_HEAD(disc_ports); 9642e9a92fSRobert Love struct fc_disc_port *dp, *next; 9742e9a92fSRobert Love 980685230cSJoe Eykholt lport = fc_disc_lport(disc); 9942e9a92fSRobert Love 1007414705eSRobert Love FC_DISC_DBG(disc, "Received an RSCN event\n"); 10142e9a92fSRobert Love 10242e9a92fSRobert Love /* make sure the frame contains an RSCN message */ 10342e9a92fSRobert Love rp = fc_frame_payload_get(fp, sizeof(*rp)); 10442e9a92fSRobert Love if (!rp) 10542e9a92fSRobert Love goto reject; 10642e9a92fSRobert Love /* make sure the page length is as expected (4 bytes) */ 10742e9a92fSRobert Love if (rp->rscn_page_len != sizeof(*pp)) 10842e9a92fSRobert Love goto reject; 10942e9a92fSRobert Love /* get the RSCN payload length */ 11042e9a92fSRobert Love len = ntohs(rp->rscn_plen); 11142e9a92fSRobert Love if (len < sizeof(*rp)) 11242e9a92fSRobert Love goto reject; 11342e9a92fSRobert Love /* make sure the frame contains the expected payload */ 11442e9a92fSRobert Love rp = fc_frame_payload_get(fp, len); 11542e9a92fSRobert Love if (!rp) 11642e9a92fSRobert Love goto reject; 11742e9a92fSRobert Love /* payload must be a multiple of the RSCN page size */ 11842e9a92fSRobert Love len -= sizeof(*rp); 11942e9a92fSRobert Love if (len % sizeof(*pp)) 12042e9a92fSRobert Love goto reject; 12142e9a92fSRobert Love 12242e9a92fSRobert Love for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) { 12342e9a92fSRobert Love ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT; 12442e9a92fSRobert Love ev_qual &= ELS_RSCN_EV_QUAL_MASK; 12542e9a92fSRobert Love fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT; 12642e9a92fSRobert Love fmt &= ELS_RSCN_ADDR_FMT_MASK; 12742e9a92fSRobert Love /* 12842e9a92fSRobert Love * if we get an address format other than port 12942e9a92fSRobert Love * (area, domain, fabric), then do a full discovery 13042e9a92fSRobert Love */ 13142e9a92fSRobert Love switch (fmt) { 13242e9a92fSRobert Love case ELS_ADDR_FMT_PORT: 1337414705eSRobert Love FC_DISC_DBG(disc, "Port address format for port " 134ce8b5df0SChris Leech "(%6.6x)\n", ntoh24(pp->rscn_fid)); 13542e9a92fSRobert Love dp = kzalloc(sizeof(*dp), GFP_KERNEL); 13642e9a92fSRobert Love if (!dp) { 13742e9a92fSRobert Love redisc = 1; 13842e9a92fSRobert Love break; 13942e9a92fSRobert Love } 14042e9a92fSRobert Love dp->lp = lport; 1419737e6a7SRobert Love dp->port_id = ntoh24(pp->rscn_fid); 14242e9a92fSRobert Love list_add_tail(&dp->peers, &disc_ports); 14342e9a92fSRobert Love break; 14442e9a92fSRobert Love case ELS_ADDR_FMT_AREA: 14542e9a92fSRobert Love case ELS_ADDR_FMT_DOM: 14642e9a92fSRobert Love case ELS_ADDR_FMT_FAB: 14742e9a92fSRobert Love default: 1487414705eSRobert Love FC_DISC_DBG(disc, "Address format is (%d)\n", fmt); 14942e9a92fSRobert Love redisc = 1; 15042e9a92fSRobert Love break; 15142e9a92fSRobert Love } 15242e9a92fSRobert Love } 15392261156SJoe Eykholt lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL); 1542ab7e1ecSJoe Eykholt 1552ab7e1ecSJoe Eykholt /* 1562ab7e1ecSJoe Eykholt * If not doing a complete rediscovery, do GPN_ID on 1572ab7e1ecSJoe Eykholt * the individual ports mentioned in the list. 1582ab7e1ecSJoe Eykholt * If any of these get an error, do a full rediscovery. 1592ab7e1ecSJoe Eykholt * In any case, go through the list and free the entries. 1602ab7e1ecSJoe Eykholt */ 1612ab7e1ecSJoe Eykholt list_for_each_entry_safe(dp, next, &disc_ports, peers) { 1622ab7e1ecSJoe Eykholt list_del(&dp->peers); 1632ab7e1ecSJoe Eykholt if (!redisc) 1642ab7e1ecSJoe Eykholt redisc = fc_disc_single(lport, dp); 1652ab7e1ecSJoe Eykholt kfree(dp); 1662ab7e1ecSJoe Eykholt } 16742e9a92fSRobert Love if (redisc) { 1687414705eSRobert Love FC_DISC_DBG(disc, "RSCN received: rediscovering\n"); 16942e9a92fSRobert Love fc_disc_restart(disc); 17042e9a92fSRobert Love } else { 1717414705eSRobert Love FC_DISC_DBG(disc, "RSCN received: not rediscovering. " 17242e9a92fSRobert Love "redisc %d state %d in_prog %d\n", 17342e9a92fSRobert Love redisc, lport->state, disc->pending); 17442e9a92fSRobert Love } 17542e9a92fSRobert Love fc_frame_free(fp); 17642e9a92fSRobert Love return; 17742e9a92fSRobert Love reject: 1787414705eSRobert Love FC_DISC_DBG(disc, "Received a bad RSCN frame\n"); 17942e9a92fSRobert Love rjt_data.reason = ELS_RJT_LOGIC; 18042e9a92fSRobert Love rjt_data.explan = ELS_EXPL_NONE; 18192261156SJoe Eykholt lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); 18242e9a92fSRobert Love fc_frame_free(fp); 18342e9a92fSRobert Love } 18442e9a92fSRobert Love 18542e9a92fSRobert Love /** 18634f42a07SRobert Love * fc_disc_recv_req() - Handle incoming requests 1873a3b42bfSRobert Love * @lport: The local port receiving the request 18892261156SJoe Eykholt * @fp: The request frame 18942e9a92fSRobert Love * 19042e9a92fSRobert Love * Locking Note: This function is called from the EM and will lock 19142e9a92fSRobert Love * the disc_mutex before calling the handler for the 19242e9a92fSRobert Love * request. 19342e9a92fSRobert Love */ 19492261156SJoe Eykholt static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp) 19542e9a92fSRobert Love { 19642e9a92fSRobert Love u8 op; 19742e9a92fSRobert Love struct fc_disc *disc = &lport->disc; 19842e9a92fSRobert Love 19942e9a92fSRobert Love op = fc_frame_payload_op(fp); 20042e9a92fSRobert Love switch (op) { 20142e9a92fSRobert Love case ELS_RSCN: 20242e9a92fSRobert Love mutex_lock(&disc->disc_mutex); 20392261156SJoe Eykholt fc_disc_recv_rscn_req(disc, fp); 20442e9a92fSRobert Love mutex_unlock(&disc->disc_mutex); 20542e9a92fSRobert Love break; 20642e9a92fSRobert Love default: 2077414705eSRobert Love FC_DISC_DBG(disc, "Received an unsupported request, " 2087414705eSRobert Love "the opcode is (%x)\n", op); 20983383dd1SHillf Danton fc_frame_free(fp); 21042e9a92fSRobert Love break; 21142e9a92fSRobert Love } 21242e9a92fSRobert Love } 21342e9a92fSRobert Love 21442e9a92fSRobert Love /** 21534f42a07SRobert Love * fc_disc_restart() - Restart discovery 2163a3b42bfSRobert Love * @disc: The discovery object to be restarted 21742e9a92fSRobert Love * 21842e9a92fSRobert Love * Locking Note: This function expects that the disc mutex 21942e9a92fSRobert Love * is already locked. 22042e9a92fSRobert Love */ 22142e9a92fSRobert Love static void fc_disc_restart(struct fc_disc *disc) 22242e9a92fSRobert Love { 223935d0fceSJoe Eykholt if (!disc->disc_callback) 224935d0fceSJoe Eykholt return; 225935d0fceSJoe Eykholt 2267414705eSRobert Love FC_DISC_DBG(disc, "Restarting discovery\n"); 22742e9a92fSRobert Love 22842e9a92fSRobert Love disc->requested = 1; 2290f6c6149SJoe Eykholt if (disc->pending) 2300f6c6149SJoe Eykholt return; 2310f6c6149SJoe Eykholt 2320f6c6149SJoe Eykholt /* 2330f6c6149SJoe Eykholt * Advance disc_id. This is an arbitrary non-zero number that will 2340f6c6149SJoe Eykholt * match the value in the fc_rport_priv after discovery for all 2350f6c6149SJoe Eykholt * freshly-discovered remote ports. Avoid wrapping to zero. 2360f6c6149SJoe Eykholt */ 2370f6c6149SJoe Eykholt disc->disc_id = (disc->disc_id + 2) | 1; 2383667d7e7SJoe Eykholt disc->retry_count = 0; 23942e9a92fSRobert Love fc_disc_gpn_ft_req(disc); 24042e9a92fSRobert Love } 24142e9a92fSRobert Love 24242e9a92fSRobert Love /** 2433a3b42bfSRobert Love * fc_disc_start() - Start discovery on a local port 2443a3b42bfSRobert Love * @lport: The local port to have discovery started on 2453a3b42bfSRobert Love * @disc_callback: Callback function to be called when discovery is complete 24642e9a92fSRobert Love */ 24742e9a92fSRobert Love static void fc_disc_start(void (*disc_callback)(struct fc_lport *, 24842e9a92fSRobert Love enum fc_disc_event), 24942e9a92fSRobert Love struct fc_lport *lport) 25042e9a92fSRobert Love { 25142e9a92fSRobert Love struct fc_disc *disc = &lport->disc; 25242e9a92fSRobert Love 25342e9a92fSRobert Love /* 25442e9a92fSRobert Love * At this point we may have a new disc job or an existing 25542e9a92fSRobert Love * one. Either way, let's lock when we make changes to it 25642e9a92fSRobert Love * and send the GPN_FT request. 25742e9a92fSRobert Love */ 25842e9a92fSRobert Love mutex_lock(&disc->disc_mutex); 25942e9a92fSRobert Love disc->disc_callback = disc_callback; 26029d898e9SJoe Eykholt fc_disc_restart(disc); 26142e9a92fSRobert Love mutex_unlock(&disc->disc_mutex); 26242e9a92fSRobert Love } 26342e9a92fSRobert Love 26442e9a92fSRobert Love /** 26534f42a07SRobert Love * fc_disc_done() - Discovery has been completed 2663a3b42bfSRobert Love * @disc: The discovery context 2673a3b42bfSRobert Love * @event: The discovery completion status 268786681b9SJoe Eykholt * 2690d228c0fSAbhijeet Joglekar * Locking Note: This function expects that the disc mutex is locked before 2700d228c0fSAbhijeet Joglekar * it is called. The discovery callback is then made with the lock released, 2710d228c0fSAbhijeet Joglekar * and the lock is re-taken before returning from this function 27242e9a92fSRobert Love */ 273786681b9SJoe Eykholt static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event) 27442e9a92fSRobert Love { 2750685230cSJoe Eykholt struct fc_lport *lport = fc_disc_lport(disc); 2760f6c6149SJoe Eykholt struct fc_rport_priv *rdata; 27742e9a92fSRobert Love 2787414705eSRobert Love FC_DISC_DBG(disc, "Discovery complete\n"); 27942e9a92fSRobert Love 28042e9a92fSRobert Love disc->pending = 0; 2810f6c6149SJoe Eykholt if (disc->requested) { 2820f6c6149SJoe Eykholt fc_disc_restart(disc); 2830f6c6149SJoe Eykholt return; 2840f6c6149SJoe Eykholt } 2850f6c6149SJoe Eykholt 2860f6c6149SJoe Eykholt /* 2870f6c6149SJoe Eykholt * Go through all remote ports. If they were found in the latest 2880f6c6149SJoe Eykholt * discovery, reverify or log them in. Otherwise, log them out. 2890f6c6149SJoe Eykholt * Skip ports which were never discovered. These are the dNS port 2900f6c6149SJoe Eykholt * and ports which were created by PLOGI. 2910f6c6149SJoe Eykholt */ 29242e90414SJoe Eykholt list_for_each_entry_rcu(rdata, &disc->rports, peers) { 2930f6c6149SJoe Eykholt if (!rdata->disc_id) 2940f6c6149SJoe Eykholt continue; 2950f6c6149SJoe Eykholt if (rdata->disc_id == disc->disc_id) 2960f6c6149SJoe Eykholt lport->tt.rport_login(rdata); 2970f6c6149SJoe Eykholt else 2980f6c6149SJoe Eykholt lport->tt.rport_logoff(rdata); 2990f6c6149SJoe Eykholt } 3000d228c0fSAbhijeet Joglekar 3010d228c0fSAbhijeet Joglekar mutex_unlock(&disc->disc_mutex); 3020d228c0fSAbhijeet Joglekar disc->disc_callback(lport, event); 3030d228c0fSAbhijeet Joglekar mutex_lock(&disc->disc_mutex); 30442e9a92fSRobert Love } 30542e9a92fSRobert Love 30642e9a92fSRobert Love /** 30734f42a07SRobert Love * fc_disc_error() - Handle error on dNS request 3083a3b42bfSRobert Love * @disc: The discovery context 3093a3b42bfSRobert Love * @fp: The error code encoded as a frame pointer 31042e9a92fSRobert Love */ 31142e9a92fSRobert Love static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp) 31242e9a92fSRobert Love { 3130685230cSJoe Eykholt struct fc_lport *lport = fc_disc_lport(disc); 31442e9a92fSRobert Love unsigned long delay = 0; 3157414705eSRobert Love 3167414705eSRobert Love FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n", 31742e9a92fSRobert Love PTR_ERR(fp), disc->retry_count, 31842e9a92fSRobert Love FC_DISC_RETRY_LIMIT); 31942e9a92fSRobert Love 32042e9a92fSRobert Love if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { 32142e9a92fSRobert Love /* 32242e9a92fSRobert Love * Memory allocation failure, or the exchange timed out, 32342e9a92fSRobert Love * retry after delay. 32442e9a92fSRobert Love */ 32542e9a92fSRobert Love if (disc->retry_count < FC_DISC_RETRY_LIMIT) { 32642e9a92fSRobert Love /* go ahead and retry */ 32742e9a92fSRobert Love if (!fp) 32842e9a92fSRobert Love delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY); 32942e9a92fSRobert Love else { 33042e9a92fSRobert Love delay = msecs_to_jiffies(lport->e_d_tov); 33142e9a92fSRobert Love 33242e9a92fSRobert Love /* timeout faster first time */ 33342e9a92fSRobert Love if (!disc->retry_count) 33442e9a92fSRobert Love delay /= 4; 33542e9a92fSRobert Love } 33642e9a92fSRobert Love disc->retry_count++; 33742e9a92fSRobert Love schedule_delayed_work(&disc->disc_work, delay); 338786681b9SJoe Eykholt } else 339786681b9SJoe Eykholt fc_disc_done(disc, DISC_EV_FAILED); 34000832084SBhanu Prakash Gollapudi } else if (PTR_ERR(fp) == -FC_EX_CLOSED) { 34100832084SBhanu Prakash Gollapudi /* 34200832084SBhanu Prakash Gollapudi * if discovery fails due to lport reset, clear 34300832084SBhanu Prakash Gollapudi * pending flag so that subsequent discovery can 34400832084SBhanu Prakash Gollapudi * continue 34500832084SBhanu Prakash Gollapudi */ 34600832084SBhanu Prakash Gollapudi disc->pending = 0; 34742e9a92fSRobert Love } 34842e9a92fSRobert Love } 34942e9a92fSRobert Love 35042e9a92fSRobert Love /** 35134f42a07SRobert Love * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request 3523a3b42bfSRobert Love * @lport: The discovery context 35342e9a92fSRobert Love * 35442e9a92fSRobert Love * Locking Note: This function expects that the disc_mutex is locked 35542e9a92fSRobert Love * before it is called. 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 36242e9a92fSRobert Love WARN_ON(!fc_lport_test_ready(lport)); 36342e9a92fSRobert Love 36442e9a92fSRobert Love disc->pending = 1; 36542e9a92fSRobert Love disc->requested = 0; 36642e9a92fSRobert Love 36742e9a92fSRobert Love disc->buf_len = 0; 36842e9a92fSRobert Love disc->seq_count = 0; 36942e9a92fSRobert Love fp = fc_frame_alloc(lport, 37042e9a92fSRobert Love sizeof(struct fc_ct_hdr) + 37142e9a92fSRobert Love sizeof(struct fc_ns_gid_ft)); 37242e9a92fSRobert Love if (!fp) 37342e9a92fSRobert Love goto err; 37442e9a92fSRobert Love 375a46f327aSJoe Eykholt if (lport->tt.elsct_send(lport, 0, fp, 37642e9a92fSRobert Love FC_NS_GPN_FT, 37742e9a92fSRobert Love fc_disc_gpn_ft_resp, 378b94f8951SJoe Eykholt disc, 3 * lport->r_a_tov)) 37942e9a92fSRobert Love return; 38042e9a92fSRobert Love err: 3818f550f93SChris Leech fc_disc_error(disc, NULL); 38242e9a92fSRobert Love } 38342e9a92fSRobert Love 38442e9a92fSRobert Love /** 385786681b9SJoe Eykholt * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response. 3863a3b42bfSRobert Love * @lport: The local port the GPN_FT was received on 3873a3b42bfSRobert Love * @buf: The GPN_FT response buffer 3883a3b42bfSRobert Love * @len: The size of response buffer 389786681b9SJoe Eykholt * 390786681b9SJoe Eykholt * Goes through the list of IDs and names resulting from a request. 39142e9a92fSRobert Love */ 39242e9a92fSRobert Love static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len) 39342e9a92fSRobert Love { 39442e9a92fSRobert Love struct fc_lport *lport; 39542e9a92fSRobert Love struct fc_gpn_ft_resp *np; 39642e9a92fSRobert Love char *bp; 39742e9a92fSRobert Love size_t plen; 39842e9a92fSRobert Love size_t tlen; 39942e9a92fSRobert Love int error = 0; 400795d86f5SJoe Eykholt struct fc_rport_identifiers ids; 401ab28f1fdSJoe Eykholt struct fc_rport_priv *rdata; 40242e9a92fSRobert Love 4030685230cSJoe Eykholt lport = fc_disc_lport(disc); 404a1c1e4e7SJoe Eykholt disc->seq_count++; 40542e9a92fSRobert Love 40642e9a92fSRobert Love /* 40742e9a92fSRobert Love * Handle partial name record left over from previous call. 40842e9a92fSRobert Love */ 40942e9a92fSRobert Love bp = buf; 41042e9a92fSRobert Love plen = len; 41142e9a92fSRobert Love np = (struct fc_gpn_ft_resp *)bp; 41242e9a92fSRobert Love tlen = disc->buf_len; 41381a67b97SJoe Eykholt disc->buf_len = 0; 41442e9a92fSRobert Love if (tlen) { 41542e9a92fSRobert Love WARN_ON(tlen >= sizeof(*np)); 41642e9a92fSRobert Love plen = sizeof(*np) - tlen; 41742e9a92fSRobert Love WARN_ON(plen <= 0); 41842e9a92fSRobert Love WARN_ON(plen >= sizeof(*np)); 41942e9a92fSRobert Love if (plen > len) 42042e9a92fSRobert Love plen = len; 42142e9a92fSRobert Love np = &disc->partial_buf; 42242e9a92fSRobert Love memcpy((char *)np + tlen, bp, plen); 42342e9a92fSRobert Love 42442e9a92fSRobert Love /* 42542e9a92fSRobert Love * Set bp so that the loop below will advance it to the 42642e9a92fSRobert Love * first valid full name element. 42742e9a92fSRobert Love */ 42842e9a92fSRobert Love bp -= tlen; 42942e9a92fSRobert Love len += tlen; 43042e9a92fSRobert Love plen += tlen; 43142e9a92fSRobert Love disc->buf_len = (unsigned char) plen; 43242e9a92fSRobert Love if (plen == sizeof(*np)) 43342e9a92fSRobert Love disc->buf_len = 0; 43442e9a92fSRobert Love } 43542e9a92fSRobert Love 43642e9a92fSRobert Love /* 43742e9a92fSRobert Love * Handle full name records, including the one filled from above. 43842e9a92fSRobert Love * Normally, np == bp and plen == len, but from the partial case above, 43942e9a92fSRobert Love * bp, len describe the overall buffer, and np, plen describe the 44042e9a92fSRobert Love * partial buffer, which if would usually be full now. 44142e9a92fSRobert Love * After the first time through the loop, things return to "normal". 44242e9a92fSRobert Love */ 44342e9a92fSRobert Love while (plen >= sizeof(*np)) { 444795d86f5SJoe Eykholt ids.port_id = ntoh24(np->fp_fid); 445795d86f5SJoe Eykholt ids.port_name = ntohll(np->fp_wwpn); 44642e9a92fSRobert Love 4477b2787ecSRobert Love if (ids.port_id != lport->port_id && 448795d86f5SJoe Eykholt ids.port_name != lport->wwpn) { 4499737e6a7SRobert Love rdata = lport->tt.rport_create(lport, ids.port_id); 4509737e6a7SRobert Love if (rdata) { 4519737e6a7SRobert Love rdata->ids.port_name = ids.port_name; 4520f6c6149SJoe Eykholt rdata->disc_id = disc->disc_id; 4539737e6a7SRobert Love } else { 4547414705eSRobert Love printk(KERN_WARNING "libfc: Failed to allocate " 4557414705eSRobert Love "memory for the newly discovered port " 456ce8b5df0SChris Leech "(%6.6x)\n", ids.port_id); 45781a67b97SJoe Eykholt error = -ENOMEM; 45881a67b97SJoe Eykholt } 45942e9a92fSRobert Love } 46042e9a92fSRobert Love 46142e9a92fSRobert Love if (np->fp_flags & FC_NS_FID_LAST) { 462786681b9SJoe Eykholt fc_disc_done(disc, DISC_EV_SUCCESS); 46342e9a92fSRobert Love len = 0; 46442e9a92fSRobert Love break; 46542e9a92fSRobert Love } 46642e9a92fSRobert Love len -= sizeof(*np); 46742e9a92fSRobert Love bp += sizeof(*np); 46842e9a92fSRobert Love np = (struct fc_gpn_ft_resp *)bp; 46942e9a92fSRobert Love plen = len; 47042e9a92fSRobert Love } 47142e9a92fSRobert Love 47242e9a92fSRobert Love /* 47342e9a92fSRobert Love * Save any partial record at the end of the buffer for next time. 47442e9a92fSRobert Love */ 47542e9a92fSRobert Love if (error == 0 && len > 0 && len < sizeof(*np)) { 47642e9a92fSRobert Love if (np != &disc->partial_buf) { 4777414705eSRobert Love FC_DISC_DBG(disc, "Partial buffer remains " 4787414705eSRobert Love "for discovery\n"); 47942e9a92fSRobert Love memcpy(&disc->partial_buf, np, len); 48042e9a92fSRobert Love } 48142e9a92fSRobert Love disc->buf_len = (unsigned char) len; 48242e9a92fSRobert Love } 48342e9a92fSRobert Love return error; 48442e9a92fSRobert Love } 48542e9a92fSRobert Love 48634f42a07SRobert Love /** 4873a3b42bfSRobert Love * fc_disc_timeout() - Handler for discovery timeouts 4883a3b42bfSRobert Love * @work: Structure holding discovery context that needs to retry discovery 48942e9a92fSRobert Love */ 49042e9a92fSRobert Love static void fc_disc_timeout(struct work_struct *work) 49142e9a92fSRobert Love { 49242e9a92fSRobert Love struct fc_disc *disc = container_of(work, 49342e9a92fSRobert Love struct fc_disc, 49442e9a92fSRobert Love disc_work.work); 49542e9a92fSRobert Love mutex_lock(&disc->disc_mutex); 49642e9a92fSRobert Love fc_disc_gpn_ft_req(disc); 49742e9a92fSRobert Love mutex_unlock(&disc->disc_mutex); 49842e9a92fSRobert Love } 49942e9a92fSRobert Love 50042e9a92fSRobert Love /** 50134f42a07SRobert Love * fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT) 5023a3b42bfSRobert Love * @sp: The sequence that the GPN_FT response was received on 5033a3b42bfSRobert Love * @fp: The GPN_FT response frame 5043a3b42bfSRobert Love * @lp_arg: The discovery context 50542e9a92fSRobert Love * 5060d228c0fSAbhijeet Joglekar * Locking Note: This function is called without disc mutex held, and 5070d228c0fSAbhijeet Joglekar * should do all its processing with the mutex held 50842e9a92fSRobert Love */ 50942e9a92fSRobert Love static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp, 51042e9a92fSRobert Love void *disc_arg) 51142e9a92fSRobert Love { 51242e9a92fSRobert Love struct fc_disc *disc = disc_arg; 51342e9a92fSRobert Love struct fc_ct_hdr *cp; 51442e9a92fSRobert Love struct fc_frame_header *fh; 515a1c1e4e7SJoe Eykholt enum fc_disc_event event = DISC_EV_NONE; 51642e9a92fSRobert Love unsigned int seq_cnt; 51742e9a92fSRobert Love unsigned int len; 518a1c1e4e7SJoe Eykholt int error = 0; 51942e9a92fSRobert Love 5200d228c0fSAbhijeet Joglekar mutex_lock(&disc->disc_mutex); 5217414705eSRobert Love FC_DISC_DBG(disc, "Received a GPN_FT response\n"); 52242e9a92fSRobert Love 52342e9a92fSRobert Love if (IS_ERR(fp)) { 52442e9a92fSRobert Love fc_disc_error(disc, fp); 5250d228c0fSAbhijeet Joglekar mutex_unlock(&disc->disc_mutex); 52642e9a92fSRobert Love return; 52742e9a92fSRobert Love } 52842e9a92fSRobert Love 52942e9a92fSRobert Love WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */ 53042e9a92fSRobert Love fh = fc_frame_header_get(fp); 53142e9a92fSRobert Love len = fr_len(fp) - sizeof(*fh); 53242e9a92fSRobert Love seq_cnt = ntohs(fh->fh_seq_cnt); 533a1c1e4e7SJoe Eykholt if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) { 53442e9a92fSRobert Love cp = fc_frame_payload_get(fp, sizeof(*cp)); 53542e9a92fSRobert Love if (!cp) { 5367414705eSRobert Love FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n", 53742e9a92fSRobert Love fr_len(fp)); 538883a337cSJoe Eykholt event = DISC_EV_FAILED; 53942e9a92fSRobert Love } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) { 54042e9a92fSRobert Love 54134f42a07SRobert Love /* Accepted, parse the response. */ 54242e9a92fSRobert Love len -= sizeof(*cp); 543a1c1e4e7SJoe Eykholt error = fc_disc_gpn_ft_parse(disc, cp + 1, len); 54442e9a92fSRobert Love } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { 5457414705eSRobert Love FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x " 54642e9a92fSRobert Love "(check zoning)\n", cp->ct_reason, 54742e9a92fSRobert Love cp->ct_explan); 548a1c1e4e7SJoe Eykholt event = DISC_EV_FAILED; 549c762608bSJoe Eykholt if (cp->ct_reason == FC_FS_RJT_UNABL && 550c762608bSJoe Eykholt cp->ct_explan == FC_FS_EXP_FTNR) 551c762608bSJoe Eykholt event = DISC_EV_SUCCESS; 55242e9a92fSRobert Love } else { 5537414705eSRobert Love FC_DISC_DBG(disc, "GPN_FT unexpected response code " 5547414705eSRobert Love "%x\n", ntohs(cp->ct_cmd)); 555883a337cSJoe Eykholt event = DISC_EV_FAILED; 55642e9a92fSRobert Love } 557a1c1e4e7SJoe Eykholt } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) { 558a1c1e4e7SJoe Eykholt error = fc_disc_gpn_ft_parse(disc, fh + 1, len); 55942e9a92fSRobert Love } else { 5607414705eSRobert Love FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? " 56142e9a92fSRobert Love "seq_cnt %x expected %x sof %x eof %x\n", 56242e9a92fSRobert Love seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp)); 563883a337cSJoe Eykholt event = DISC_EV_FAILED; 56442e9a92fSRobert Love } 56542e9a92fSRobert Love if (error) 56642e9a92fSRobert Love fc_disc_error(disc, fp); 567a1c1e4e7SJoe Eykholt else if (event != DISC_EV_NONE) 568a1c1e4e7SJoe Eykholt fc_disc_done(disc, event); 56942e9a92fSRobert Love fc_frame_free(fp); 5700d228c0fSAbhijeet Joglekar mutex_unlock(&disc->disc_mutex); 57142e9a92fSRobert Love } 57242e9a92fSRobert Love 57342e9a92fSRobert Love /** 5742ab7e1ecSJoe Eykholt * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID) 5753a3b42bfSRobert Love * @sp: The sequence the GPN_ID is on 5763a3b42bfSRobert Love * @fp: The response frame 5773a3b42bfSRobert Love * @rdata_arg: The remote port that sent the GPN_ID response 5782ab7e1ecSJoe Eykholt * 5792ab7e1ecSJoe Eykholt * Locking Note: This function is called without disc mutex held. 5802ab7e1ecSJoe Eykholt */ 5812ab7e1ecSJoe Eykholt static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, 5822ab7e1ecSJoe Eykholt void *rdata_arg) 5832ab7e1ecSJoe Eykholt { 5842ab7e1ecSJoe Eykholt struct fc_rport_priv *rdata = rdata_arg; 5852ab7e1ecSJoe Eykholt struct fc_rport_priv *new_rdata; 5862ab7e1ecSJoe Eykholt struct fc_lport *lport; 5872ab7e1ecSJoe Eykholt struct fc_disc *disc; 5882ab7e1ecSJoe Eykholt struct fc_ct_hdr *cp; 5892ab7e1ecSJoe Eykholt struct fc_ns_gid_pn *pn; 5902ab7e1ecSJoe Eykholt u64 port_name; 5912ab7e1ecSJoe Eykholt 5922ab7e1ecSJoe Eykholt lport = rdata->local_port; 5932ab7e1ecSJoe Eykholt disc = &lport->disc; 5942ab7e1ecSJoe Eykholt 5952ab7e1ecSJoe Eykholt mutex_lock(&disc->disc_mutex); 5962ab7e1ecSJoe Eykholt if (PTR_ERR(fp) == -FC_EX_CLOSED) 5972ab7e1ecSJoe Eykholt goto out; 5982ab7e1ecSJoe Eykholt if (IS_ERR(fp)) 5992ab7e1ecSJoe Eykholt goto redisc; 6002ab7e1ecSJoe Eykholt 6012ab7e1ecSJoe Eykholt cp = fc_frame_payload_get(fp, sizeof(*cp)); 6022ab7e1ecSJoe Eykholt if (!cp) 6032ab7e1ecSJoe Eykholt goto redisc; 6042ab7e1ecSJoe Eykholt if (ntohs(cp->ct_cmd) == FC_FS_ACC) { 6052ab7e1ecSJoe Eykholt if (fr_len(fp) < sizeof(struct fc_frame_header) + 6062ab7e1ecSJoe Eykholt sizeof(*cp) + sizeof(*pn)) 6072ab7e1ecSJoe Eykholt goto redisc; 6082ab7e1ecSJoe Eykholt pn = (struct fc_ns_gid_pn *)(cp + 1); 6092ab7e1ecSJoe Eykholt port_name = get_unaligned_be64(&pn->fn_wwpn); 6102ab7e1ecSJoe Eykholt if (rdata->ids.port_name == -1) 6112ab7e1ecSJoe Eykholt rdata->ids.port_name = port_name; 6122ab7e1ecSJoe Eykholt else if (rdata->ids.port_name != port_name) { 6132ab7e1ecSJoe Eykholt FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. " 6149f8f3aa6SChris Leech "Port-id %6.6x wwpn %16.16llx\n", 6152ab7e1ecSJoe Eykholt rdata->ids.port_id, port_name); 6162ab7e1ecSJoe Eykholt lport->tt.rport_logoff(rdata); 6172ab7e1ecSJoe Eykholt 6182ab7e1ecSJoe Eykholt new_rdata = lport->tt.rport_create(lport, 6192ab7e1ecSJoe Eykholt rdata->ids.port_id); 6202ab7e1ecSJoe Eykholt if (new_rdata) { 6212ab7e1ecSJoe Eykholt new_rdata->disc_id = disc->disc_id; 6222ab7e1ecSJoe Eykholt lport->tt.rport_login(new_rdata); 6232ab7e1ecSJoe Eykholt } 6242ab7e1ecSJoe Eykholt goto out; 6252ab7e1ecSJoe Eykholt } 6262ab7e1ecSJoe Eykholt rdata->disc_id = disc->disc_id; 6272ab7e1ecSJoe Eykholt lport->tt.rport_login(rdata); 6282ab7e1ecSJoe Eykholt } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { 6292ab7e1ecSJoe Eykholt FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n", 6302ab7e1ecSJoe Eykholt cp->ct_reason, cp->ct_explan); 6312ab7e1ecSJoe Eykholt lport->tt.rport_logoff(rdata); 6322ab7e1ecSJoe Eykholt } else { 6332ab7e1ecSJoe Eykholt FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n", 6342ab7e1ecSJoe Eykholt ntohs(cp->ct_cmd)); 6352ab7e1ecSJoe Eykholt redisc: 6362ab7e1ecSJoe Eykholt fc_disc_restart(disc); 6372ab7e1ecSJoe Eykholt } 6382ab7e1ecSJoe Eykholt out: 6392ab7e1ecSJoe Eykholt mutex_unlock(&disc->disc_mutex); 6402ab7e1ecSJoe Eykholt kref_put(&rdata->kref, lport->tt.rport_destroy); 6412ab7e1ecSJoe Eykholt } 6422ab7e1ecSJoe Eykholt 6432ab7e1ecSJoe Eykholt /** 6442ab7e1ecSJoe Eykholt * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request 6453a3b42bfSRobert Love * @lport: The local port to initiate discovery on 6462ab7e1ecSJoe Eykholt * @rdata: remote port private data 6472ab7e1ecSJoe Eykholt * 6482ab7e1ecSJoe Eykholt * Locking Note: This function expects that the disc_mutex is locked 6492ab7e1ecSJoe Eykholt * before it is called. 6502ab7e1ecSJoe Eykholt * On failure, an error code is returned. 6512ab7e1ecSJoe Eykholt */ 6522ab7e1ecSJoe Eykholt static int fc_disc_gpn_id_req(struct fc_lport *lport, 6532ab7e1ecSJoe Eykholt struct fc_rport_priv *rdata) 6542ab7e1ecSJoe Eykholt { 6552ab7e1ecSJoe Eykholt struct fc_frame *fp; 6562ab7e1ecSJoe Eykholt 6572ab7e1ecSJoe Eykholt fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + 6582ab7e1ecSJoe Eykholt sizeof(struct fc_ns_fid)); 6592ab7e1ecSJoe Eykholt if (!fp) 6602ab7e1ecSJoe Eykholt return -ENOMEM; 6612ab7e1ecSJoe Eykholt if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID, 662b94f8951SJoe Eykholt fc_disc_gpn_id_resp, rdata, 663b94f8951SJoe Eykholt 3 * lport->r_a_tov)) 6642ab7e1ecSJoe Eykholt return -ENOMEM; 6652ab7e1ecSJoe Eykholt kref_get(&rdata->kref); 6662ab7e1ecSJoe Eykholt return 0; 6672ab7e1ecSJoe Eykholt } 6682ab7e1ecSJoe Eykholt 6692ab7e1ecSJoe Eykholt /** 67034f42a07SRobert Love * fc_disc_single() - Discover the directory information for a single target 6713a3b42bfSRobert Love * @lport: The local port the remote port is associated with 67242e9a92fSRobert Love * @dp: The port to rediscover 67342e9a92fSRobert Love * 67442e9a92fSRobert Love * Locking Note: This function expects that the disc_mutex is locked 67542e9a92fSRobert Love * before it is called. 67642e9a92fSRobert Love */ 6772ab7e1ecSJoe Eykholt static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp) 67842e9a92fSRobert Love { 679ab28f1fdSJoe Eykholt struct fc_rport_priv *rdata; 68042e9a92fSRobert Love 6819737e6a7SRobert Love rdata = lport->tt.rport_create(lport, dp->port_id); 6822ab7e1ecSJoe Eykholt if (!rdata) 6832ab7e1ecSJoe Eykholt return -ENOMEM; 6842ab7e1ecSJoe Eykholt rdata->disc_id = 0; 6852ab7e1ecSJoe Eykholt return fc_disc_gpn_id_req(lport, rdata); 68642e9a92fSRobert Love } 68742e9a92fSRobert Love 68842e9a92fSRobert Love /** 68934f42a07SRobert Love * fc_disc_stop() - Stop discovery for a given lport 6903a3b42bfSRobert Love * @lport: The local port that discovery should stop on 69142e9a92fSRobert Love */ 692c6b21c93SBart Van Assche static void fc_disc_stop(struct fc_lport *lport) 69342e9a92fSRobert Love { 69442e9a92fSRobert Love struct fc_disc *disc = &lport->disc; 69542e9a92fSRobert Love 696c531b9b4SBhanu Prakash Gollapudi if (disc->pending) 69742e9a92fSRobert Love cancel_delayed_work_sync(&disc->disc_work); 69842e9a92fSRobert Love fc_disc_stop_rports(disc); 69942e9a92fSRobert Love } 70042e9a92fSRobert Love 70142e9a92fSRobert Love /** 70234f42a07SRobert Love * fc_disc_stop_final() - Stop discovery for a given lport 7033a3b42bfSRobert Love * @lport: The lport that discovery should stop on 70442e9a92fSRobert Love * 70542e9a92fSRobert Love * This function will block until discovery has been 70642e9a92fSRobert Love * completely stopped and all rports have been deleted. 70742e9a92fSRobert Love */ 708c6b21c93SBart Van Assche static void fc_disc_stop_final(struct fc_lport *lport) 70942e9a92fSRobert Love { 71042e9a92fSRobert Love fc_disc_stop(lport); 71142e9a92fSRobert Love lport->tt.rport_flush_queue(); 71242e9a92fSRobert Love } 71342e9a92fSRobert Love 71442e9a92fSRobert Love /** 7153a3b42bfSRobert Love * fc_disc_init() - Initialize the discovery layer for a local port 7163a3b42bfSRobert Love * @lport: The local port that needs the discovery layer to be initialized 7178a9a7138SRobert Love * @priv: Private data structre for users of the discovery layer 71842e9a92fSRobert Love */ 7198a9a7138SRobert Love int fc_disc_init(struct fc_lport *lport, void *priv) 72042e9a92fSRobert Love { 72142e9a92fSRobert Love struct fc_disc *disc; 72242e9a92fSRobert Love 72342e9a92fSRobert Love if (!lport->tt.disc_start) 72442e9a92fSRobert Love lport->tt.disc_start = fc_disc_start; 72542e9a92fSRobert Love 72642e9a92fSRobert Love if (!lport->tt.disc_stop) 72742e9a92fSRobert Love lport->tt.disc_stop = fc_disc_stop; 72842e9a92fSRobert Love 72942e9a92fSRobert Love if (!lport->tt.disc_stop_final) 73042e9a92fSRobert Love lport->tt.disc_stop_final = fc_disc_stop_final; 73142e9a92fSRobert Love 73242e9a92fSRobert Love if (!lport->tt.disc_recv_req) 73342e9a92fSRobert Love lport->tt.disc_recv_req = fc_disc_recv_req; 73442e9a92fSRobert Love 73542e9a92fSRobert Love disc = &lport->disc; 73642e9a92fSRobert Love INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout); 73742e9a92fSRobert Love mutex_init(&disc->disc_mutex); 73842e9a92fSRobert Love INIT_LIST_HEAD(&disc->rports); 73942e9a92fSRobert Love 7408a9a7138SRobert Love disc->priv = priv; 74142e9a92fSRobert Love 74242e9a92fSRobert Love return 0; 74342e9a92fSRobert Love } 74442e9a92fSRobert Love EXPORT_SYMBOL(fc_disc_init); 745