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> 3842e9a92fSRobert Love #include <asm/unaligned.h> 3942e9a92fSRobert Love 4042e9a92fSRobert Love #include <scsi/fc/fc_gs.h> 4142e9a92fSRobert Love 4242e9a92fSRobert Love #include <scsi/libfc.h> 4342e9a92fSRobert Love 448866a5d9SRobert Love #include "fc_libfc.h" 458866a5d9SRobert Love 4642e9a92fSRobert Love #define FC_DISC_RETRY_LIMIT 3 /* max retries */ 4742e9a92fSRobert Love #define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ 4842e9a92fSRobert Love 4942e9a92fSRobert Love static void fc_disc_gpn_ft_req(struct fc_disc *); 5042e9a92fSRobert Love static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *); 51786681b9SJoe Eykholt static void fc_disc_done(struct fc_disc *, enum fc_disc_event); 5242e9a92fSRobert Love static void fc_disc_timeout(struct work_struct *); 532ab7e1ecSJoe Eykholt static int fc_disc_single(struct fc_lport *, struct fc_disc_port *); 5442e9a92fSRobert Love static void fc_disc_restart(struct fc_disc *); 5542e9a92fSRobert Love 5642e9a92fSRobert Love /** 573a3b42bfSRobert Love * fc_disc_stop_rports() - Delete all the remote ports associated with the lport 583a3b42bfSRobert Love * @disc: The discovery job to stop remote ports on 5942e9a92fSRobert Love * 6042e9a92fSRobert Love * Locking Note: This function expects that the lport mutex is locked before 6142e9a92fSRobert Love * calling it. 6242e9a92fSRobert Love */ 6342e9a92fSRobert Love void fc_disc_stop_rports(struct fc_disc *disc) 6442e9a92fSRobert Love { 6542e9a92fSRobert Love struct fc_lport *lport; 66ab28f1fdSJoe Eykholt struct fc_rport_priv *rdata, *next; 6742e9a92fSRobert Love 6842e9a92fSRobert Love lport = disc->lport; 6942e9a92fSRobert Love 7042e9a92fSRobert Love mutex_lock(&disc->disc_mutex); 719e9d0452SJoe Eykholt list_for_each_entry_safe(rdata, next, &disc->rports, peers) 729fb9d328SJoe Eykholt lport->tt.rport_logoff(rdata); 7342e9a92fSRobert Love mutex_unlock(&disc->disc_mutex); 7442e9a92fSRobert Love } 7542e9a92fSRobert Love 7642e9a92fSRobert Love /** 7734f42a07SRobert Love * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN) 783a3b42bfSRobert Love * @sp: The sequence of the RSCN exchange 793a3b42bfSRobert Love * @fp: The RSCN frame 803a3b42bfSRobert Love * @lport: The local port that the request will be sent on 8142e9a92fSRobert Love * 8242e9a92fSRobert Love * Locking Note: This function expects that the disc_mutex is locked 8342e9a92fSRobert Love * before it is called. 8442e9a92fSRobert Love */ 8542e9a92fSRobert Love static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp, 8642e9a92fSRobert Love struct fc_disc *disc) 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 9942e9a92fSRobert Love lport = disc->lport; 10042e9a92fSRobert Love 1017414705eSRobert Love FC_DISC_DBG(disc, "Received an RSCN event\n"); 10242e9a92fSRobert Love 10342e9a92fSRobert Love /* make sure the frame contains an RSCN message */ 10442e9a92fSRobert Love rp = fc_frame_payload_get(fp, sizeof(*rp)); 10542e9a92fSRobert Love if (!rp) 10642e9a92fSRobert Love goto reject; 10742e9a92fSRobert Love /* make sure the page length is as expected (4 bytes) */ 10842e9a92fSRobert Love if (rp->rscn_page_len != sizeof(*pp)) 10942e9a92fSRobert Love goto reject; 11042e9a92fSRobert Love /* get the RSCN payload length */ 11142e9a92fSRobert Love len = ntohs(rp->rscn_plen); 11242e9a92fSRobert Love if (len < sizeof(*rp)) 11342e9a92fSRobert Love goto reject; 11442e9a92fSRobert Love /* make sure the frame contains the expected payload */ 11542e9a92fSRobert Love rp = fc_frame_payload_get(fp, len); 11642e9a92fSRobert Love if (!rp) 11742e9a92fSRobert Love goto reject; 11842e9a92fSRobert Love /* payload must be a multiple of the RSCN page size */ 11942e9a92fSRobert Love len -= sizeof(*rp); 12042e9a92fSRobert Love if (len % sizeof(*pp)) 12142e9a92fSRobert Love goto reject; 12242e9a92fSRobert Love 12342e9a92fSRobert Love for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) { 12442e9a92fSRobert Love ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT; 12542e9a92fSRobert Love ev_qual &= ELS_RSCN_EV_QUAL_MASK; 12642e9a92fSRobert Love fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT; 12742e9a92fSRobert Love fmt &= ELS_RSCN_ADDR_FMT_MASK; 12842e9a92fSRobert Love /* 12942e9a92fSRobert Love * if we get an address format other than port 13042e9a92fSRobert Love * (area, domain, fabric), then do a full discovery 13142e9a92fSRobert Love */ 13242e9a92fSRobert Love switch (fmt) { 13342e9a92fSRobert Love case ELS_ADDR_FMT_PORT: 1347414705eSRobert Love FC_DISC_DBG(disc, "Port address format for port " 1357414705eSRobert Love "(%6x)\n", ntoh24(pp->rscn_fid)); 13642e9a92fSRobert Love dp = kzalloc(sizeof(*dp), GFP_KERNEL); 13742e9a92fSRobert Love if (!dp) { 13842e9a92fSRobert Love redisc = 1; 13942e9a92fSRobert Love break; 14042e9a92fSRobert Love } 14142e9a92fSRobert Love dp->lp = lport; 1429737e6a7SRobert Love dp->port_id = ntoh24(pp->rscn_fid); 14342e9a92fSRobert Love list_add_tail(&dp->peers, &disc_ports); 14442e9a92fSRobert Love break; 14542e9a92fSRobert Love case ELS_ADDR_FMT_AREA: 14642e9a92fSRobert Love case ELS_ADDR_FMT_DOM: 14742e9a92fSRobert Love case ELS_ADDR_FMT_FAB: 14842e9a92fSRobert Love default: 1497414705eSRobert Love FC_DISC_DBG(disc, "Address format is (%d)\n", fmt); 15042e9a92fSRobert Love redisc = 1; 15142e9a92fSRobert Love break; 15242e9a92fSRobert Love } 15342e9a92fSRobert Love } 15442e9a92fSRobert Love lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); 1552ab7e1ecSJoe Eykholt 1562ab7e1ecSJoe Eykholt /* 1572ab7e1ecSJoe Eykholt * If not doing a complete rediscovery, do GPN_ID on 1582ab7e1ecSJoe Eykholt * the individual ports mentioned in the list. 1592ab7e1ecSJoe Eykholt * If any of these get an error, do a full rediscovery. 1602ab7e1ecSJoe Eykholt * In any case, go through the list and free the entries. 1612ab7e1ecSJoe Eykholt */ 1622ab7e1ecSJoe Eykholt list_for_each_entry_safe(dp, next, &disc_ports, peers) { 1632ab7e1ecSJoe Eykholt list_del(&dp->peers); 1642ab7e1ecSJoe Eykholt if (!redisc) 1652ab7e1ecSJoe Eykholt redisc = fc_disc_single(lport, dp); 1662ab7e1ecSJoe Eykholt kfree(dp); 1672ab7e1ecSJoe Eykholt } 16842e9a92fSRobert Love if (redisc) { 1697414705eSRobert Love FC_DISC_DBG(disc, "RSCN received: rediscovering\n"); 17042e9a92fSRobert Love fc_disc_restart(disc); 17142e9a92fSRobert Love } else { 1727414705eSRobert Love FC_DISC_DBG(disc, "RSCN received: not rediscovering. " 17342e9a92fSRobert Love "redisc %d state %d in_prog %d\n", 17442e9a92fSRobert Love redisc, lport->state, disc->pending); 17542e9a92fSRobert Love } 17642e9a92fSRobert Love fc_frame_free(fp); 17742e9a92fSRobert Love return; 17842e9a92fSRobert Love reject: 1797414705eSRobert Love FC_DISC_DBG(disc, "Received a bad RSCN frame\n"); 18042e9a92fSRobert Love rjt_data.fp = NULL; 18142e9a92fSRobert Love rjt_data.reason = ELS_RJT_LOGIC; 18242e9a92fSRobert Love rjt_data.explan = ELS_EXPL_NONE; 18342e9a92fSRobert Love lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); 18442e9a92fSRobert Love fc_frame_free(fp); 18542e9a92fSRobert Love } 18642e9a92fSRobert Love 18742e9a92fSRobert Love /** 18834f42a07SRobert Love * fc_disc_recv_req() - Handle incoming requests 1893a3b42bfSRobert Love * @sp: The sequence of the request exchange 1903a3b42bfSRobert Love * @fp: The request frame 1913a3b42bfSRobert Love * @lport: The local port receiving the request 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 */ 19742e9a92fSRobert Love static void fc_disc_recv_req(struct fc_seq *sp, struct fc_frame *fp, 19842e9a92fSRobert Love struct fc_lport *lport) 19942e9a92fSRobert Love { 20042e9a92fSRobert Love u8 op; 20142e9a92fSRobert Love struct fc_disc *disc = &lport->disc; 20242e9a92fSRobert Love 20342e9a92fSRobert Love op = fc_frame_payload_op(fp); 20442e9a92fSRobert Love switch (op) { 20542e9a92fSRobert Love case ELS_RSCN: 20642e9a92fSRobert Love mutex_lock(&disc->disc_mutex); 20742e9a92fSRobert Love fc_disc_recv_rscn_req(sp, fp, disc); 20842e9a92fSRobert Love mutex_unlock(&disc->disc_mutex); 20942e9a92fSRobert Love break; 21042e9a92fSRobert Love default: 2117414705eSRobert Love FC_DISC_DBG(disc, "Received an unsupported request, " 2127414705eSRobert Love "the opcode is (%x)\n", op); 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 * Locking Note: This function expects that the disc mutex 22242e9a92fSRobert Love * is already locked. 22342e9a92fSRobert Love */ 22442e9a92fSRobert Love static void fc_disc_restart(struct fc_disc *disc) 22542e9a92fSRobert Love { 226935d0fceSJoe Eykholt if (!disc->disc_callback) 227935d0fceSJoe Eykholt return; 228935d0fceSJoe Eykholt 2297414705eSRobert Love FC_DISC_DBG(disc, "Restarting discovery\n"); 23042e9a92fSRobert Love 23142e9a92fSRobert Love disc->requested = 1; 2320f6c6149SJoe Eykholt if (disc->pending) 2330f6c6149SJoe Eykholt return; 2340f6c6149SJoe Eykholt 2350f6c6149SJoe Eykholt /* 2360f6c6149SJoe Eykholt * Advance disc_id. This is an arbitrary non-zero number that will 2370f6c6149SJoe Eykholt * match the value in the fc_rport_priv after discovery for all 2380f6c6149SJoe Eykholt * freshly-discovered remote ports. Avoid wrapping to zero. 2390f6c6149SJoe Eykholt */ 2400f6c6149SJoe Eykholt disc->disc_id = (disc->disc_id + 2) | 1; 2413667d7e7SJoe Eykholt disc->retry_count = 0; 24242e9a92fSRobert Love fc_disc_gpn_ft_req(disc); 24342e9a92fSRobert Love } 24442e9a92fSRobert Love 24542e9a92fSRobert Love /** 2463a3b42bfSRobert Love * fc_disc_start() - Start discovery on a local port 2473a3b42bfSRobert Love * @lport: The local port to have discovery started on 2483a3b42bfSRobert Love * @disc_callback: Callback function to be called when discovery is complete 24942e9a92fSRobert Love */ 25042e9a92fSRobert Love static void fc_disc_start(void (*disc_callback)(struct fc_lport *, 25142e9a92fSRobert Love enum fc_disc_event), 25242e9a92fSRobert Love struct fc_lport *lport) 25342e9a92fSRobert Love { 25442e9a92fSRobert Love struct fc_disc *disc = &lport->disc; 25542e9a92fSRobert Love 25642e9a92fSRobert Love /* 25742e9a92fSRobert Love * At this point we may have a new disc job or an existing 25842e9a92fSRobert Love * one. Either way, let's lock when we make changes to it 25942e9a92fSRobert Love * and send the GPN_FT request. 26042e9a92fSRobert Love */ 26142e9a92fSRobert Love mutex_lock(&disc->disc_mutex); 26242e9a92fSRobert Love disc->disc_callback = disc_callback; 26329d898e9SJoe Eykholt fc_disc_restart(disc); 26442e9a92fSRobert Love mutex_unlock(&disc->disc_mutex); 26542e9a92fSRobert Love } 26642e9a92fSRobert Love 26742e9a92fSRobert Love /** 26834f42a07SRobert Love * fc_disc_done() - Discovery has been completed 2693a3b42bfSRobert Love * @disc: The discovery context 2703a3b42bfSRobert Love * @event: The discovery completion status 271786681b9SJoe Eykholt * 2720d228c0fSAbhijeet Joglekar * Locking Note: This function expects that the disc mutex is locked before 2730d228c0fSAbhijeet Joglekar * it is called. The discovery callback is then made with the lock released, 2740d228c0fSAbhijeet Joglekar * and the lock is re-taken before returning from this function 27542e9a92fSRobert Love */ 276786681b9SJoe Eykholt static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event) 27742e9a92fSRobert Love { 27842e9a92fSRobert Love struct fc_lport *lport = disc->lport; 2790f6c6149SJoe Eykholt struct fc_rport_priv *rdata; 28042e9a92fSRobert Love 2817414705eSRobert Love FC_DISC_DBG(disc, "Discovery complete\n"); 28242e9a92fSRobert Love 28342e9a92fSRobert Love disc->pending = 0; 2840f6c6149SJoe Eykholt if (disc->requested) { 2850f6c6149SJoe Eykholt fc_disc_restart(disc); 2860f6c6149SJoe Eykholt return; 2870f6c6149SJoe Eykholt } 2880f6c6149SJoe Eykholt 2890f6c6149SJoe Eykholt /* 2900f6c6149SJoe Eykholt * Go through all remote ports. If they were found in the latest 2910f6c6149SJoe Eykholt * discovery, reverify or log them in. Otherwise, log them out. 2920f6c6149SJoe Eykholt * Skip ports which were never discovered. These are the dNS port 2930f6c6149SJoe Eykholt * and ports which were created by PLOGI. 2940f6c6149SJoe Eykholt */ 2950f6c6149SJoe Eykholt list_for_each_entry(rdata, &disc->rports, peers) { 2960f6c6149SJoe Eykholt if (!rdata->disc_id) 2970f6c6149SJoe Eykholt continue; 2980f6c6149SJoe Eykholt if (rdata->disc_id == disc->disc_id) 2990f6c6149SJoe Eykholt lport->tt.rport_login(rdata); 3000f6c6149SJoe Eykholt else 3010f6c6149SJoe Eykholt lport->tt.rport_logoff(rdata); 3020f6c6149SJoe Eykholt } 3030d228c0fSAbhijeet Joglekar 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 { 31642e9a92fSRobert Love struct fc_lport *lport = disc->lport; 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); 34342e9a92fSRobert Love } 34442e9a92fSRobert Love } 34542e9a92fSRobert Love 34642e9a92fSRobert Love /** 34734f42a07SRobert Love * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request 3483a3b42bfSRobert Love * @lport: The discovery context 34942e9a92fSRobert Love * 35042e9a92fSRobert Love * Locking Note: This function expects that the disc_mutex is locked 35142e9a92fSRobert Love * before it is called. 35242e9a92fSRobert Love */ 35342e9a92fSRobert Love static void fc_disc_gpn_ft_req(struct fc_disc *disc) 35442e9a92fSRobert Love { 35542e9a92fSRobert Love struct fc_frame *fp; 35642e9a92fSRobert Love struct fc_lport *lport = disc->lport; 35742e9a92fSRobert Love 35842e9a92fSRobert Love WARN_ON(!fc_lport_test_ready(lport)); 35942e9a92fSRobert Love 36042e9a92fSRobert Love disc->pending = 1; 36142e9a92fSRobert Love disc->requested = 0; 36242e9a92fSRobert Love 36342e9a92fSRobert Love disc->buf_len = 0; 36442e9a92fSRobert Love disc->seq_count = 0; 36542e9a92fSRobert Love fp = fc_frame_alloc(lport, 36642e9a92fSRobert Love sizeof(struct fc_ct_hdr) + 36742e9a92fSRobert Love sizeof(struct fc_ns_gid_ft)); 36842e9a92fSRobert Love if (!fp) 36942e9a92fSRobert Love goto err; 37042e9a92fSRobert Love 371a46f327aSJoe Eykholt if (lport->tt.elsct_send(lport, 0, fp, 37242e9a92fSRobert Love FC_NS_GPN_FT, 37342e9a92fSRobert Love fc_disc_gpn_ft_resp, 374b94f8951SJoe Eykholt disc, 3 * lport->r_a_tov)) 37542e9a92fSRobert Love return; 37642e9a92fSRobert Love err: 3778f550f93SChris Leech fc_disc_error(disc, NULL); 37842e9a92fSRobert Love } 37942e9a92fSRobert Love 38042e9a92fSRobert Love /** 381786681b9SJoe Eykholt * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response. 3823a3b42bfSRobert Love * @lport: The local port the GPN_FT was received on 3833a3b42bfSRobert Love * @buf: The GPN_FT response buffer 3843a3b42bfSRobert Love * @len: The size of response buffer 385786681b9SJoe Eykholt * 386786681b9SJoe Eykholt * Goes through the list of IDs and names resulting from a request. 38742e9a92fSRobert Love */ 38842e9a92fSRobert Love static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len) 38942e9a92fSRobert Love { 39042e9a92fSRobert Love struct fc_lport *lport; 39142e9a92fSRobert Love struct fc_gpn_ft_resp *np; 39242e9a92fSRobert Love char *bp; 39342e9a92fSRobert Love size_t plen; 39442e9a92fSRobert Love size_t tlen; 39542e9a92fSRobert Love int error = 0; 396795d86f5SJoe Eykholt struct fc_rport_identifiers ids; 397ab28f1fdSJoe Eykholt struct fc_rport_priv *rdata; 39842e9a92fSRobert Love 39942e9a92fSRobert Love lport = disc->lport; 400a1c1e4e7SJoe Eykholt disc->seq_count++; 40142e9a92fSRobert Love 40242e9a92fSRobert Love /* 40342e9a92fSRobert Love * Handle partial name record left over from previous call. 40442e9a92fSRobert Love */ 40542e9a92fSRobert Love bp = buf; 40642e9a92fSRobert Love plen = len; 40742e9a92fSRobert Love np = (struct fc_gpn_ft_resp *)bp; 40842e9a92fSRobert Love tlen = disc->buf_len; 40981a67b97SJoe Eykholt disc->buf_len = 0; 41042e9a92fSRobert Love if (tlen) { 41142e9a92fSRobert Love WARN_ON(tlen >= sizeof(*np)); 41242e9a92fSRobert Love plen = sizeof(*np) - tlen; 41342e9a92fSRobert Love WARN_ON(plen <= 0); 41442e9a92fSRobert Love WARN_ON(plen >= sizeof(*np)); 41542e9a92fSRobert Love if (plen > len) 41642e9a92fSRobert Love plen = len; 41742e9a92fSRobert Love np = &disc->partial_buf; 41842e9a92fSRobert Love memcpy((char *)np + tlen, bp, plen); 41942e9a92fSRobert Love 42042e9a92fSRobert Love /* 42142e9a92fSRobert Love * Set bp so that the loop below will advance it to the 42242e9a92fSRobert Love * first valid full name element. 42342e9a92fSRobert Love */ 42442e9a92fSRobert Love bp -= tlen; 42542e9a92fSRobert Love len += tlen; 42642e9a92fSRobert Love plen += tlen; 42742e9a92fSRobert Love disc->buf_len = (unsigned char) plen; 42842e9a92fSRobert Love if (plen == sizeof(*np)) 42942e9a92fSRobert Love disc->buf_len = 0; 43042e9a92fSRobert Love } 43142e9a92fSRobert Love 43242e9a92fSRobert Love /* 43342e9a92fSRobert Love * Handle full name records, including the one filled from above. 43442e9a92fSRobert Love * Normally, np == bp and plen == len, but from the partial case above, 43542e9a92fSRobert Love * bp, len describe the overall buffer, and np, plen describe the 43642e9a92fSRobert Love * partial buffer, which if would usually be full now. 43742e9a92fSRobert Love * After the first time through the loop, things return to "normal". 43842e9a92fSRobert Love */ 43942e9a92fSRobert Love while (plen >= sizeof(*np)) { 440795d86f5SJoe Eykholt ids.port_id = ntoh24(np->fp_fid); 441795d86f5SJoe Eykholt ids.port_name = ntohll(np->fp_wwpn); 44242e9a92fSRobert Love 443795d86f5SJoe Eykholt if (ids.port_id != fc_host_port_id(lport->host) && 444795d86f5SJoe Eykholt ids.port_name != lport->wwpn) { 4459737e6a7SRobert Love rdata = lport->tt.rport_create(lport, ids.port_id); 4469737e6a7SRobert Love if (rdata) { 4479737e6a7SRobert Love rdata->ids.port_name = ids.port_name; 4480f6c6149SJoe Eykholt rdata->disc_id = disc->disc_id; 4499737e6a7SRobert Love } else { 4507414705eSRobert Love printk(KERN_WARNING "libfc: Failed to allocate " 4517414705eSRobert Love "memory for the newly discovered port " 452795d86f5SJoe Eykholt "(%6x)\n", ids.port_id); 45381a67b97SJoe Eykholt error = -ENOMEM; 45481a67b97SJoe Eykholt } 45542e9a92fSRobert Love } 45642e9a92fSRobert Love 45742e9a92fSRobert Love if (np->fp_flags & FC_NS_FID_LAST) { 458786681b9SJoe Eykholt fc_disc_done(disc, DISC_EV_SUCCESS); 45942e9a92fSRobert Love len = 0; 46042e9a92fSRobert Love break; 46142e9a92fSRobert Love } 46242e9a92fSRobert Love len -= sizeof(*np); 46342e9a92fSRobert Love bp += sizeof(*np); 46442e9a92fSRobert Love np = (struct fc_gpn_ft_resp *)bp; 46542e9a92fSRobert Love plen = len; 46642e9a92fSRobert Love } 46742e9a92fSRobert Love 46842e9a92fSRobert Love /* 46942e9a92fSRobert Love * Save any partial record at the end of the buffer for next time. 47042e9a92fSRobert Love */ 47142e9a92fSRobert Love if (error == 0 && len > 0 && len < sizeof(*np)) { 47242e9a92fSRobert Love if (np != &disc->partial_buf) { 4737414705eSRobert Love FC_DISC_DBG(disc, "Partial buffer remains " 4747414705eSRobert Love "for discovery\n"); 47542e9a92fSRobert Love memcpy(&disc->partial_buf, np, len); 47642e9a92fSRobert Love } 47742e9a92fSRobert Love disc->buf_len = (unsigned char) len; 47842e9a92fSRobert Love } 47942e9a92fSRobert Love return error; 48042e9a92fSRobert Love } 48142e9a92fSRobert Love 48234f42a07SRobert Love /** 4833a3b42bfSRobert Love * fc_disc_timeout() - Handler for discovery timeouts 4843a3b42bfSRobert Love * @work: Structure holding discovery context that needs to retry discovery 48542e9a92fSRobert Love */ 48642e9a92fSRobert Love static void fc_disc_timeout(struct work_struct *work) 48742e9a92fSRobert Love { 48842e9a92fSRobert Love struct fc_disc *disc = container_of(work, 48942e9a92fSRobert Love struct fc_disc, 49042e9a92fSRobert Love disc_work.work); 49142e9a92fSRobert Love mutex_lock(&disc->disc_mutex); 49242e9a92fSRobert Love fc_disc_gpn_ft_req(disc); 49342e9a92fSRobert Love mutex_unlock(&disc->disc_mutex); 49442e9a92fSRobert Love } 49542e9a92fSRobert Love 49642e9a92fSRobert Love /** 49734f42a07SRobert Love * fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT) 4983a3b42bfSRobert Love * @sp: The sequence that the GPN_FT response was received on 4993a3b42bfSRobert Love * @fp: The GPN_FT response frame 5003a3b42bfSRobert Love * @lp_arg: The discovery context 50142e9a92fSRobert Love * 5020d228c0fSAbhijeet Joglekar * Locking Note: This function is called without disc mutex held, and 5030d228c0fSAbhijeet Joglekar * should do all its processing with the mutex held 50442e9a92fSRobert Love */ 50542e9a92fSRobert Love static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp, 50642e9a92fSRobert Love void *disc_arg) 50742e9a92fSRobert Love { 50842e9a92fSRobert Love struct fc_disc *disc = disc_arg; 50942e9a92fSRobert Love struct fc_ct_hdr *cp; 51042e9a92fSRobert Love struct fc_frame_header *fh; 511a1c1e4e7SJoe Eykholt enum fc_disc_event event = DISC_EV_NONE; 51242e9a92fSRobert Love unsigned int seq_cnt; 51342e9a92fSRobert Love unsigned int len; 514a1c1e4e7SJoe Eykholt int error = 0; 51542e9a92fSRobert Love 5160d228c0fSAbhijeet Joglekar mutex_lock(&disc->disc_mutex); 5177414705eSRobert Love FC_DISC_DBG(disc, "Received a GPN_FT response\n"); 51842e9a92fSRobert Love 51942e9a92fSRobert Love if (IS_ERR(fp)) { 52042e9a92fSRobert Love fc_disc_error(disc, fp); 5210d228c0fSAbhijeet Joglekar mutex_unlock(&disc->disc_mutex); 52242e9a92fSRobert Love return; 52342e9a92fSRobert Love } 52442e9a92fSRobert Love 52542e9a92fSRobert Love WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */ 52642e9a92fSRobert Love fh = fc_frame_header_get(fp); 52742e9a92fSRobert Love len = fr_len(fp) - sizeof(*fh); 52842e9a92fSRobert Love seq_cnt = ntohs(fh->fh_seq_cnt); 529a1c1e4e7SJoe Eykholt if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) { 53042e9a92fSRobert Love cp = fc_frame_payload_get(fp, sizeof(*cp)); 53142e9a92fSRobert Love if (!cp) { 5327414705eSRobert Love FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n", 53342e9a92fSRobert Love fr_len(fp)); 534883a337cSJoe Eykholt event = DISC_EV_FAILED; 53542e9a92fSRobert Love } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) { 53642e9a92fSRobert Love 53734f42a07SRobert Love /* Accepted, parse the response. */ 53842e9a92fSRobert Love len -= sizeof(*cp); 539a1c1e4e7SJoe Eykholt error = fc_disc_gpn_ft_parse(disc, cp + 1, len); 54042e9a92fSRobert Love } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { 5417414705eSRobert Love FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x " 54242e9a92fSRobert Love "(check zoning)\n", cp->ct_reason, 54342e9a92fSRobert Love cp->ct_explan); 544a1c1e4e7SJoe Eykholt event = DISC_EV_FAILED; 545c762608bSJoe Eykholt if (cp->ct_reason == FC_FS_RJT_UNABL && 546c762608bSJoe Eykholt cp->ct_explan == FC_FS_EXP_FTNR) 547c762608bSJoe Eykholt event = DISC_EV_SUCCESS; 54842e9a92fSRobert Love } else { 5497414705eSRobert Love FC_DISC_DBG(disc, "GPN_FT unexpected response code " 5507414705eSRobert Love "%x\n", ntohs(cp->ct_cmd)); 551883a337cSJoe Eykholt event = DISC_EV_FAILED; 55242e9a92fSRobert Love } 553a1c1e4e7SJoe Eykholt } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) { 554a1c1e4e7SJoe Eykholt error = fc_disc_gpn_ft_parse(disc, fh + 1, len); 55542e9a92fSRobert Love } else { 5567414705eSRobert Love FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? " 55742e9a92fSRobert Love "seq_cnt %x expected %x sof %x eof %x\n", 55842e9a92fSRobert Love seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp)); 559883a337cSJoe Eykholt event = DISC_EV_FAILED; 56042e9a92fSRobert Love } 56142e9a92fSRobert Love if (error) 56242e9a92fSRobert Love fc_disc_error(disc, fp); 563a1c1e4e7SJoe Eykholt else if (event != DISC_EV_NONE) 564a1c1e4e7SJoe Eykholt fc_disc_done(disc, event); 56542e9a92fSRobert Love fc_frame_free(fp); 5660d228c0fSAbhijeet Joglekar mutex_unlock(&disc->disc_mutex); 56742e9a92fSRobert Love } 56842e9a92fSRobert Love 56942e9a92fSRobert Love /** 5702ab7e1ecSJoe Eykholt * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID) 5713a3b42bfSRobert Love * @sp: The sequence the GPN_ID is on 5723a3b42bfSRobert Love * @fp: The response frame 5733a3b42bfSRobert Love * @rdata_arg: The remote port that sent the GPN_ID response 5742ab7e1ecSJoe Eykholt * 5752ab7e1ecSJoe Eykholt * Locking Note: This function is called without disc mutex held. 5762ab7e1ecSJoe Eykholt */ 5772ab7e1ecSJoe Eykholt static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, 5782ab7e1ecSJoe Eykholt void *rdata_arg) 5792ab7e1ecSJoe Eykholt { 5802ab7e1ecSJoe Eykholt struct fc_rport_priv *rdata = rdata_arg; 5812ab7e1ecSJoe Eykholt struct fc_rport_priv *new_rdata; 5822ab7e1ecSJoe Eykholt struct fc_lport *lport; 5832ab7e1ecSJoe Eykholt struct fc_disc *disc; 5842ab7e1ecSJoe Eykholt struct fc_ct_hdr *cp; 5852ab7e1ecSJoe Eykholt struct fc_ns_gid_pn *pn; 5862ab7e1ecSJoe Eykholt u64 port_name; 5872ab7e1ecSJoe Eykholt 5882ab7e1ecSJoe Eykholt lport = rdata->local_port; 5892ab7e1ecSJoe Eykholt disc = &lport->disc; 5902ab7e1ecSJoe Eykholt 5912ab7e1ecSJoe Eykholt mutex_lock(&disc->disc_mutex); 5922ab7e1ecSJoe Eykholt if (PTR_ERR(fp) == -FC_EX_CLOSED) 5932ab7e1ecSJoe Eykholt goto out; 5942ab7e1ecSJoe Eykholt if (IS_ERR(fp)) 5952ab7e1ecSJoe Eykholt goto redisc; 5962ab7e1ecSJoe Eykholt 5972ab7e1ecSJoe Eykholt cp = fc_frame_payload_get(fp, sizeof(*cp)); 5982ab7e1ecSJoe Eykholt if (!cp) 5992ab7e1ecSJoe Eykholt goto redisc; 6002ab7e1ecSJoe Eykholt if (ntohs(cp->ct_cmd) == FC_FS_ACC) { 6012ab7e1ecSJoe Eykholt if (fr_len(fp) < sizeof(struct fc_frame_header) + 6022ab7e1ecSJoe Eykholt sizeof(*cp) + sizeof(*pn)) 6032ab7e1ecSJoe Eykholt goto redisc; 6042ab7e1ecSJoe Eykholt pn = (struct fc_ns_gid_pn *)(cp + 1); 6052ab7e1ecSJoe Eykholt port_name = get_unaligned_be64(&pn->fn_wwpn); 6062ab7e1ecSJoe Eykholt if (rdata->ids.port_name == -1) 6072ab7e1ecSJoe Eykholt rdata->ids.port_name = port_name; 6082ab7e1ecSJoe Eykholt else if (rdata->ids.port_name != port_name) { 6092ab7e1ecSJoe Eykholt FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. " 6102ab7e1ecSJoe Eykholt "Port-id %x wwpn %llx\n", 6112ab7e1ecSJoe Eykholt rdata->ids.port_id, port_name); 6122ab7e1ecSJoe Eykholt lport->tt.rport_logoff(rdata); 6132ab7e1ecSJoe Eykholt 6142ab7e1ecSJoe Eykholt new_rdata = lport->tt.rport_create(lport, 6152ab7e1ecSJoe Eykholt rdata->ids.port_id); 6162ab7e1ecSJoe Eykholt if (new_rdata) { 6172ab7e1ecSJoe Eykholt new_rdata->disc_id = disc->disc_id; 6182ab7e1ecSJoe Eykholt lport->tt.rport_login(new_rdata); 6192ab7e1ecSJoe Eykholt } 6202ab7e1ecSJoe Eykholt goto out; 6212ab7e1ecSJoe Eykholt } 6222ab7e1ecSJoe Eykholt rdata->disc_id = disc->disc_id; 6232ab7e1ecSJoe Eykholt lport->tt.rport_login(rdata); 6242ab7e1ecSJoe Eykholt } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { 6252ab7e1ecSJoe Eykholt FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n", 6262ab7e1ecSJoe Eykholt cp->ct_reason, cp->ct_explan); 6272ab7e1ecSJoe Eykholt lport->tt.rport_logoff(rdata); 6282ab7e1ecSJoe Eykholt } else { 6292ab7e1ecSJoe Eykholt FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n", 6302ab7e1ecSJoe Eykholt ntohs(cp->ct_cmd)); 6312ab7e1ecSJoe Eykholt redisc: 6322ab7e1ecSJoe Eykholt fc_disc_restart(disc); 6332ab7e1ecSJoe Eykholt } 6342ab7e1ecSJoe Eykholt out: 6352ab7e1ecSJoe Eykholt mutex_unlock(&disc->disc_mutex); 6362ab7e1ecSJoe Eykholt kref_put(&rdata->kref, lport->tt.rport_destroy); 6372ab7e1ecSJoe Eykholt } 6382ab7e1ecSJoe Eykholt 6392ab7e1ecSJoe Eykholt /** 6402ab7e1ecSJoe Eykholt * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request 6413a3b42bfSRobert Love * @lport: The local port to initiate discovery on 6422ab7e1ecSJoe Eykholt * @rdata: remote port private data 6432ab7e1ecSJoe Eykholt * 6442ab7e1ecSJoe Eykholt * Locking Note: This function expects that the disc_mutex is locked 6452ab7e1ecSJoe Eykholt * before it is called. 6462ab7e1ecSJoe Eykholt * On failure, an error code is returned. 6472ab7e1ecSJoe Eykholt */ 6482ab7e1ecSJoe Eykholt static int fc_disc_gpn_id_req(struct fc_lport *lport, 6492ab7e1ecSJoe Eykholt struct fc_rport_priv *rdata) 6502ab7e1ecSJoe Eykholt { 6512ab7e1ecSJoe Eykholt struct fc_frame *fp; 6522ab7e1ecSJoe Eykholt 6532ab7e1ecSJoe Eykholt fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + 6542ab7e1ecSJoe Eykholt sizeof(struct fc_ns_fid)); 6552ab7e1ecSJoe Eykholt if (!fp) 6562ab7e1ecSJoe Eykholt return -ENOMEM; 6572ab7e1ecSJoe Eykholt if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID, 658b94f8951SJoe Eykholt fc_disc_gpn_id_resp, rdata, 659b94f8951SJoe Eykholt 3 * lport->r_a_tov)) 6602ab7e1ecSJoe Eykholt return -ENOMEM; 6612ab7e1ecSJoe Eykholt kref_get(&rdata->kref); 6622ab7e1ecSJoe Eykholt return 0; 6632ab7e1ecSJoe Eykholt } 6642ab7e1ecSJoe Eykholt 6652ab7e1ecSJoe Eykholt /** 66634f42a07SRobert Love * fc_disc_single() - Discover the directory information for a single target 6673a3b42bfSRobert Love * @lport: The local port the remote port is associated with 66842e9a92fSRobert Love * @dp: The port to rediscover 66942e9a92fSRobert Love * 67042e9a92fSRobert Love * Locking Note: This function expects that the disc_mutex is locked 67142e9a92fSRobert Love * before it is called. 67242e9a92fSRobert Love */ 6732ab7e1ecSJoe Eykholt static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp) 67442e9a92fSRobert Love { 675ab28f1fdSJoe Eykholt struct fc_rport_priv *rdata; 67642e9a92fSRobert Love 6779737e6a7SRobert Love rdata = lport->tt.rport_create(lport, dp->port_id); 6782ab7e1ecSJoe Eykholt if (!rdata) 6792ab7e1ecSJoe Eykholt return -ENOMEM; 6802ab7e1ecSJoe Eykholt rdata->disc_id = 0; 6812ab7e1ecSJoe Eykholt return fc_disc_gpn_id_req(lport, rdata); 68242e9a92fSRobert Love } 68342e9a92fSRobert Love 68442e9a92fSRobert Love /** 68534f42a07SRobert Love * fc_disc_stop() - Stop discovery for a given lport 6863a3b42bfSRobert Love * @lport: The local port that discovery should stop on 68742e9a92fSRobert Love */ 68842e9a92fSRobert Love void fc_disc_stop(struct fc_lport *lport) 68942e9a92fSRobert Love { 69042e9a92fSRobert Love struct fc_disc *disc = &lport->disc; 69142e9a92fSRobert Love 69242e9a92fSRobert Love if (disc) { 69342e9a92fSRobert Love cancel_delayed_work_sync(&disc->disc_work); 69442e9a92fSRobert Love fc_disc_stop_rports(disc); 69542e9a92fSRobert Love } 69642e9a92fSRobert Love } 69742e9a92fSRobert Love 69842e9a92fSRobert Love /** 69934f42a07SRobert Love * fc_disc_stop_final() - Stop discovery for a given lport 7003a3b42bfSRobert Love * @lport: The lport that discovery should stop on 70142e9a92fSRobert Love * 70242e9a92fSRobert Love * This function will block until discovery has been 70342e9a92fSRobert Love * completely stopped and all rports have been deleted. 70442e9a92fSRobert Love */ 70542e9a92fSRobert Love void fc_disc_stop_final(struct fc_lport *lport) 70642e9a92fSRobert Love { 70742e9a92fSRobert Love fc_disc_stop(lport); 70842e9a92fSRobert Love lport->tt.rport_flush_queue(); 70942e9a92fSRobert Love } 71042e9a92fSRobert Love 71142e9a92fSRobert Love /** 7123a3b42bfSRobert Love * fc_disc_init() - Initialize the discovery layer for a local port 7133a3b42bfSRobert Love * @lport: The local port that needs the discovery layer to be initialized 71442e9a92fSRobert Love */ 71542e9a92fSRobert Love int fc_disc_init(struct fc_lport *lport) 71642e9a92fSRobert Love { 71742e9a92fSRobert Love struct fc_disc *disc; 71842e9a92fSRobert Love 71942e9a92fSRobert Love if (!lport->tt.disc_start) 72042e9a92fSRobert Love lport->tt.disc_start = fc_disc_start; 72142e9a92fSRobert Love 72242e9a92fSRobert Love if (!lport->tt.disc_stop) 72342e9a92fSRobert Love lport->tt.disc_stop = fc_disc_stop; 72442e9a92fSRobert Love 72542e9a92fSRobert Love if (!lport->tt.disc_stop_final) 72642e9a92fSRobert Love lport->tt.disc_stop_final = fc_disc_stop_final; 72742e9a92fSRobert Love 72842e9a92fSRobert Love if (!lport->tt.disc_recv_req) 72942e9a92fSRobert Love lport->tt.disc_recv_req = fc_disc_recv_req; 73042e9a92fSRobert Love 73142e9a92fSRobert Love disc = &lport->disc; 73242e9a92fSRobert Love INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout); 73342e9a92fSRobert Love mutex_init(&disc->disc_mutex); 73442e9a92fSRobert Love INIT_LIST_HEAD(&disc->rports); 73542e9a92fSRobert Love 73642e9a92fSRobert Love disc->lport = lport; 73742e9a92fSRobert Love 73842e9a92fSRobert Love return 0; 73942e9a92fSRobert Love } 74042e9a92fSRobert Love EXPORT_SYMBOL(fc_disc_init); 741