| /* |
| * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Maintained at www.Open-FCoE.org |
| */ |
| |
| /* |
| * Target Discovery |
| * |
| * This block discovers all FC-4 remote ports, including FCP initiators. It |
| * also handles RSCN events and re-discovery if necessary. |
| */ |
| |
| /* |
| * DISC LOCKING |
| * |
| * The disc mutex is can be locked when acquiring rport locks, but may not |
| * be held when acquiring the lport lock. Refer to fc_lport.c for more |
| * details. |
| */ |
| |
| #include <linux/timer.h> |
| #include <linux/slab.h> |
| #include <linux/err.h> |
| #include <linux/export.h> |
| #include <asm/unaligned.h> |
| |
| #include <scsi/fc/fc_gs.h> |
| |
| #include <scsi/libfc.h> |
| |
| #include "fc_libfc.h" |
| |
| #define FC_DISC_RETRY_LIMIT 3 /* max retries */ |
| #define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ |
| |
| static void fc_disc_gpn_ft_req(struct fc_disc *); |
| static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *); |
| static void fc_disc_done(struct fc_disc *, enum fc_disc_event); |
| static void fc_disc_timeout(struct work_struct *); |
| static int fc_disc_single(struct fc_lport *, struct fc_disc_port *); |
| static void fc_disc_restart(struct fc_disc *); |
| |
| /** |
| * fc_disc_stop_rports() - Delete all the remote ports associated with the lport |
| * @disc: The discovery job to stop remote ports on |
| * |
| * Locking Note: This function expects that the lport mutex is locked before |
| * calling it. |
| */ |
| static void fc_disc_stop_rports(struct fc_disc *disc) |
| { |
| struct fc_lport *lport; |
| struct fc_rport_priv *rdata; |
| |
| lport = fc_disc_lport(disc); |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(rdata, &disc->rports, peers) { |
| if (kref_get_unless_zero(&rdata->kref)) { |
| fc_rport_logoff(rdata); |
| kref_put(&rdata->kref, fc_rport_destroy); |
| } |
| } |
| rcu_read_unlock(); |
| } |
| |
| /** |
| * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN) |
| * @disc: The discovery object to which the RSCN applies |
| * @fp: The RSCN frame |
| * |
| * Locking Note: This function expects that the disc_mutex is locked |
| * before it is called. |
| */ |
| static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp) |
| { |
| struct fc_lport *lport; |
| struct fc_els_rscn *rp; |
| struct fc_els_rscn_page *pp; |
| struct fc_seq_els_data rjt_data; |
| unsigned int len; |
| int redisc = 0; |
| enum fc_els_rscn_ev_qual ev_qual; |
| enum fc_els_rscn_addr_fmt fmt; |
| LIST_HEAD(disc_ports); |
| struct fc_disc_port *dp, *next; |
| |
| lport = fc_disc_lport(disc); |
| |
| FC_DISC_DBG(disc, "Received an RSCN event\n"); |
| |
| /* make sure the frame contains an RSCN message */ |
| rp = fc_frame_payload_get(fp, sizeof(*rp)); |
| if (!rp) |
| goto reject; |
| /* make sure the page length is as expected (4 bytes) */ |
| if (rp->rscn_page_len != sizeof(*pp)) |
| goto reject; |
| /* get the RSCN payload length */ |
| len = ntohs(rp->rscn_plen); |
| if (len < sizeof(*rp)) |
| goto reject; |
| /* make sure the frame contains the expected payload */ |
| rp = fc_frame_payload_get(fp, len); |
| if (!rp) |
| goto reject; |
| /* payload must be a multiple of the RSCN page size */ |
| len -= sizeof(*rp); |
| if (len % sizeof(*pp)) |
| goto reject; |
| |
| for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) { |
| ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT; |
| ev_qual &= ELS_RSCN_EV_QUAL_MASK; |
| fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT; |
| fmt &= ELS_RSCN_ADDR_FMT_MASK; |
| /* |
| * if we get an address format other than port |
| * (area, domain, fabric), then do a full discovery |
| */ |
| switch (fmt) { |
| case ELS_ADDR_FMT_PORT: |
| FC_DISC_DBG(disc, "Port address format for port " |
| "(%6.6x)\n", ntoh24(pp->rscn_fid)); |
| dp = kzalloc(sizeof(*dp), GFP_KERNEL); |
| if (!dp) { |
| redisc = 1; |
| break; |
| } |
| dp->lp = lport; |
| dp->port_id = ntoh24(pp->rscn_fid); |
| list_add_tail(&dp->peers, &disc_ports); |
| break; |
| case ELS_ADDR_FMT_AREA: |
| case ELS_ADDR_FMT_DOM: |
| case ELS_ADDR_FMT_FAB: |
| default: |
| FC_DISC_DBG(disc, "Address format is (%d)\n", fmt); |
| redisc = 1; |
| break; |
| } |
| } |
| fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL); |
| |
| /* |
| * If not doing a complete rediscovery, do GPN_ID on |
| * the individual ports mentioned in the list. |
| * If any of these get an error, do a full rediscovery. |
| * In any case, go through the list and free the entries. |
| */ |
| list_for_each_entry_safe(dp, next, &disc_ports, peers) { |
| list_del(&dp->peers); |
| if (!redisc) |
| redisc = fc_disc_single(lport, dp); |
| kfree(dp); |
| } |
| if (redisc) { |
| FC_DISC_DBG(disc, "RSCN received: rediscovering\n"); |
| fc_disc_restart(disc); |
| } else { |
| FC_DISC_DBG(disc, "RSCN received: not rediscovering. " |
| "redisc %d state %d in_prog %d\n", |
| redisc, lport->state, disc->pending); |
| } |
| fc_frame_free(fp); |
| return; |
| reject: |
| FC_DISC_DBG(disc, "Received a bad RSCN frame\n"); |
| rjt_data.reason = ELS_RJT_LOGIC; |
| rjt_data.explan = ELS_EXPL_NONE; |
| fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); |
| fc_frame_free(fp); |
| } |
| |
| /** |
| * fc_disc_recv_req() - Handle incoming requests |
| * @lport: The local port receiving the request |
| * @fp: The request frame |
| * |
| * Locking Note: This function is called from the EM and will lock |
| * the disc_mutex before calling the handler for the |
| * request. |
| */ |
| static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp) |
| { |
| u8 op; |
| struct fc_disc *disc = &lport->disc; |
| |
| op = fc_frame_payload_op(fp); |
| switch (op) { |
| case ELS_RSCN: |
| mutex_lock(&disc->disc_mutex); |
| fc_disc_recv_rscn_req(disc, fp); |
| mutex_unlock(&disc->disc_mutex); |
| break; |
| default: |
| FC_DISC_DBG(disc, "Received an unsupported request, " |
| "the opcode is (%x)\n", op); |
| fc_frame_free(fp); |
| break; |
| } |
| } |
| |
| /** |
| * fc_disc_restart() - Restart discovery |
| * @disc: The discovery object to be restarted |
| * |
| * Locking Note: This function expects that the disc mutex |
| * is already locked. |
| */ |
| static void fc_disc_restart(struct fc_disc *disc) |
| { |
| if (!disc->disc_callback) |
| return; |
| |
| FC_DISC_DBG(disc, "Restarting discovery\n"); |
| |
| disc->requested = 1; |
| if (disc->pending) |
| return; |
| |
| /* |
| * Advance disc_id. This is an arbitrary non-zero number that will |
| * match the value in the fc_rport_priv after discovery for all |
| * freshly-discovered remote ports. Avoid wrapping to zero. |
| */ |
| disc->disc_id = (disc->disc_id + 2) | 1; |
| disc->retry_count = 0; |
| fc_disc_gpn_ft_req(disc); |
| } |
| |
| /** |
| * fc_disc_start() - Start discovery on a local port |
| * @lport: The local port to have discovery started on |
| * @disc_callback: Callback function to be called when discovery is complete |
| */ |
| static void fc_disc_start(void (*disc_callback)(struct fc_lport *, |
| enum fc_disc_event), |
| struct fc_lport *lport) |
| { |
| struct fc_disc *disc = &lport->disc; |
| |
| /* |
| * At this point we may have a new disc job or an existing |
| * one. Either way, let's lock when we make changes to it |
| * and send the GPN_FT request. |
| */ |
| mutex_lock(&disc->disc_mutex); |
| disc->disc_callback = disc_callback; |
| fc_disc_restart(disc); |
| mutex_unlock(&disc->disc_mutex); |
| } |
| |
| /** |
| * fc_disc_done() - Discovery has been completed |
| * @disc: The discovery context |
| * @event: The discovery completion status |
| * |
| * Locking Note: This function expects that the disc mutex is locked before |
| * it is called. The discovery callback is then made with the lock released, |
| * and the lock is re-taken before returning from this function |
| */ |
| static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event) |
| { |
| struct fc_lport *lport = fc_disc_lport(disc); |
| struct fc_rport_priv *rdata; |
| |
| FC_DISC_DBG(disc, "Discovery complete\n"); |
| |
| disc->pending = 0; |
| if (disc->requested) { |
| fc_disc_restart(disc); |
| return; |
| } |
| |
| /* |
| * Go through all remote ports. If they were found in the latest |
| * discovery, reverify or log them in. Otherwise, log them out. |
| * Skip ports which were never discovered. These are the dNS port |
| * and ports which were created by PLOGI. |
| */ |
| rcu_read_lock(); |
| list_for_each_entry_rcu(rdata, &disc->rports, peers) { |
| if (!kref_get_unless_zero(&rdata->kref)) |
| continue; |
| if (rdata->disc_id) { |
| if (rdata->disc_id == disc->disc_id) |
| fc_rport_login(rdata); |
| else |
| fc_rport_logoff(rdata); |
| } |
| kref_put(&rdata->kref, fc_rport_destroy); |
| } |
| rcu_read_unlock(); |
| mutex_unlock(&disc->disc_mutex); |
| disc->disc_callback(lport, event); |
| mutex_lock(&disc->disc_mutex); |
| } |
| |
| /** |
| * fc_disc_error() - Handle error on dNS request |
| * @disc: The discovery context |
| * @fp: The error code encoded as a frame pointer |
| */ |
| static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp) |
| { |
| struct fc_lport *lport = fc_disc_lport(disc); |
| unsigned long delay = 0; |
| |
| FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n", |
| PTR_ERR(fp), disc->retry_count, |
| FC_DISC_RETRY_LIMIT); |
| |
| if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { |
| /* |
| * Memory allocation failure, or the exchange timed out, |
| * retry after delay. |
| */ |
| if (disc->retry_count < FC_DISC_RETRY_LIMIT) { |
| /* go ahead and retry */ |
| if (!fp) |
| delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY); |
| else { |
| delay = msecs_to_jiffies(lport->e_d_tov); |
| |
| /* timeout faster first time */ |
| if (!disc->retry_count) |
| delay /= 4; |
| } |
| disc->retry_count++; |
| schedule_delayed_work(&disc->disc_work, delay); |
| } else |
| fc_disc_done(disc, DISC_EV_FAILED); |
| } else if (PTR_ERR(fp) == -FC_EX_CLOSED) { |
| /* |
| * if discovery fails due to lport reset, clear |
| * pending flag so that subsequent discovery can |
| * continue |
| */ |
| disc->pending = 0; |
| } |
| } |
| |
| /** |
| * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request |
| * @lport: The discovery context |
| * |
| * Locking Note: This function expects that the disc_mutex is locked |
| * before it is called. |
| */ |
| static void fc_disc_gpn_ft_req(struct fc_disc *disc) |
| { |
| struct fc_frame *fp; |
| struct fc_lport *lport = fc_disc_lport(disc); |
| |
| WARN_ON(!fc_lport_test_ready(lport)); |
| |
| disc->pending = 1; |
| disc->requested = 0; |
| |
| disc->buf_len = 0; |
| disc->seq_count = 0; |
| fp = fc_frame_alloc(lport, |
| sizeof(struct fc_ct_hdr) + |
| sizeof(struct fc_ns_gid_ft)); |
| if (!fp) |
| goto err; |
| |
| if (lport->tt.elsct_send(lport, 0, fp, |
| FC_NS_GPN_FT, |
| fc_disc_gpn_ft_resp, |
| disc, 3 * lport->r_a_tov)) |
| return; |
| err: |
| fc_disc_error(disc, NULL); |
| } |
| |
| /** |
| * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response. |
| * @lport: The local port the GPN_FT was received on |
| * @buf: The GPN_FT response buffer |
| * @len: The size of response buffer |
| * |
| * Goes through the list of IDs and names resulting from a request. |
| */ |
| static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len) |
| { |
| struct fc_lport *lport; |
| struct fc_gpn_ft_resp *np; |
| char *bp; |
| size_t plen; |
| size_t tlen; |
| int error = 0; |
| struct fc_rport_identifiers ids; |
| struct fc_rport_priv *rdata; |
| |
| lport = fc_disc_lport(disc); |
| disc->seq_count++; |
| |
| /* |
| * Handle partial name record left over from previous call. |
| */ |
| bp = buf; |
| plen = len; |
| np = (struct fc_gpn_ft_resp *)bp; |
| tlen = disc->buf_len; |
| disc->buf_len = 0; |
| if (tlen) { |
| WARN_ON(tlen >= sizeof(*np)); |
| plen = sizeof(*np) - tlen; |
| WARN_ON(plen <= 0); |
| WARN_ON(plen >= sizeof(*np)); |
| if (plen > len) |
| plen = len; |
| np = &disc->partial_buf; |
| memcpy((char *)np + tlen, bp, plen); |
| |
| /* |
| * Set bp so that the loop below will advance it to the |
| * first valid full name element. |
| */ |
| bp -= tlen; |
| len += tlen; |
| plen += tlen; |
| disc->buf_len = (unsigned char) plen; |
| if (plen == sizeof(*np)) |
| disc->buf_len = 0; |
| } |
| |
| /* |
| * Handle full name records, including the one filled from above. |
| * Normally, np == bp and plen == len, but from the partial case above, |
| * bp, len describe the overall buffer, and np, plen describe the |
| * partial buffer, which if would usually be full now. |
| * After the first time through the loop, things return to "normal". |
| */ |
| while (plen >= sizeof(*np)) { |
| ids.port_id = ntoh24(np->fp_fid); |
| ids.port_name = ntohll(np->fp_wwpn); |
| |
| if (ids.port_id != lport->port_id && |
| ids.port_name != lport->wwpn) { |
| rdata = fc_rport_create(lport, ids.port_id); |
| if (rdata) { |
| rdata->ids.port_name = ids.port_name; |
| rdata->disc_id = disc->disc_id; |
| } else { |
| printk(KERN_WARNING "libfc: Failed to allocate " |
| "memory for the newly discovered port " |
| "(%6.6x)\n", ids.port_id); |
| error = -ENOMEM; |
| } |
| } |
| |
| if (np->fp_flags & FC_NS_FID_LAST) { |
| fc_disc_done(disc, DISC_EV_SUCCESS); |
| len = 0; |
| break; |
| } |
| len -= sizeof(*np); |
| bp += sizeof(*np); |
| np = (struct fc_gpn_ft_resp *)bp; |
| plen = len; |
| } |
| |
| /* |
| * Save any partial record at the end of the buffer for next time. |
| */ |
| if (error == 0 && len > 0 && len < sizeof(*np)) { |
| if (np != &disc->partial_buf) { |
| FC_DISC_DBG(disc, "Partial buffer remains " |
| "for discovery\n"); |
| memcpy(&disc->partial_buf, np, len); |
| } |
| disc->buf_len = (unsigned char) len; |
| } |
| return error; |
| } |
| |
| /** |
| * fc_disc_timeout() - Handler for discovery timeouts |
| * @work: Structure holding discovery context that needs to retry discovery |
| */ |
| static void fc_disc_timeout(struct work_struct *work) |
| { |
| struct fc_disc *disc = container_of(work, |
| struct fc_disc, |
| disc_work.work); |
| mutex_lock(&disc->disc_mutex); |
| fc_disc_gpn_ft_req(disc); |
| mutex_unlock(&disc->disc_mutex); |
| } |
| |
| /** |
| * fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT) |
| * @sp: The sequence that the GPN_FT response was received on |
| * @fp: The GPN_FT response frame |
| * @lp_arg: The discovery context |
| * |
| * Locking Note: This function is called without disc mutex held, and |
| * should do all its processing with the mutex held |
| */ |
| static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp, |
| void *disc_arg) |
| { |
| struct fc_disc *disc = disc_arg; |
| struct fc_ct_hdr *cp; |
| struct fc_frame_header *fh; |
| enum fc_disc_event event = DISC_EV_NONE; |
| unsigned int seq_cnt; |
| unsigned int len; |
| int error = 0; |
| |
| mutex_lock(&disc->disc_mutex); |
| FC_DISC_DBG(disc, "Received a GPN_FT response\n"); |
| |
| if (IS_ERR(fp)) { |
| fc_disc_error(disc, fp); |
| mutex_unlock(&disc->disc_mutex); |
| return; |
| } |
| |
| WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */ |
| fh = fc_frame_header_get(fp); |
| len = fr_len(fp) - sizeof(*fh); |
| seq_cnt = ntohs(fh->fh_seq_cnt); |
| if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) { |
| cp = fc_frame_payload_get(fp, sizeof(*cp)); |
| if (!cp) { |
| FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n", |
| fr_len(fp)); |
| event = DISC_EV_FAILED; |
| } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) { |
| |
| /* Accepted, parse the response. */ |
| len -= sizeof(*cp); |
| error = fc_disc_gpn_ft_parse(disc, cp + 1, len); |
| } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { |
| FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x " |
| "(check zoning)\n", cp->ct_reason, |
| cp->ct_explan); |
| event = DISC_EV_FAILED; |
| if (cp->ct_reason == FC_FS_RJT_UNABL && |
| cp->ct_explan == FC_FS_EXP_FTNR) |
| event = DISC_EV_SUCCESS; |
| } else { |
| FC_DISC_DBG(disc, "GPN_FT unexpected response code " |
| "%x\n", ntohs(cp->ct_cmd)); |
| event = DISC_EV_FAILED; |
| } |
| } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) { |
| error = fc_disc_gpn_ft_parse(disc, fh + 1, len); |
| } else { |
| FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? " |
| "seq_cnt %x expected %x sof %x eof %x\n", |
| seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp)); |
| event = DISC_EV_FAILED; |
| } |
| if (error) |
| fc_disc_error(disc, fp); |
| else if (event != DISC_EV_NONE) |
| fc_disc_done(disc, event); |
| fc_frame_free(fp); |
| mutex_unlock(&disc->disc_mutex); |
| } |
| |
| /** |
| * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID) |
| * @sp: The sequence the GPN_ID is on |
| * @fp: The response frame |
| * @rdata_arg: The remote port that sent the GPN_ID response |
| * |
| * Locking Note: This function is called without disc mutex held. |
| */ |
| static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, |
| void *rdata_arg) |
| { |
| struct fc_rport_priv *rdata = rdata_arg; |
| struct fc_rport_priv *new_rdata; |
| struct fc_lport *lport; |
| struct fc_disc *disc; |
| struct fc_ct_hdr *cp; |
| struct fc_ns_gid_pn *pn; |
| u64 port_name; |
| |
| lport = rdata->local_port; |
| disc = &lport->disc; |
| |
| if (PTR_ERR(fp) == -FC_EX_CLOSED) |
| goto out; |
| if (IS_ERR(fp)) |
| goto redisc; |
| |
| cp = fc_frame_payload_get(fp, sizeof(*cp)); |
| if (!cp) |
| goto redisc; |
| if (ntohs(cp->ct_cmd) == FC_FS_ACC) { |
| if (fr_len(fp) < sizeof(struct fc_frame_header) + |
| sizeof(*cp) + sizeof(*pn)) |
| goto redisc; |
| pn = (struct fc_ns_gid_pn *)(cp + 1); |
| port_name = get_unaligned_be64(&pn->fn_wwpn); |
| mutex_lock(&rdata->rp_mutex); |
| if (rdata->ids.port_name == -1) |
| rdata->ids.port_name = port_name; |
| else if (rdata->ids.port_name != port_name) { |
| FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. " |
| "Port-id %6.6x wwpn %16.16llx\n", |
| rdata->ids.port_id, port_name); |
| mutex_unlock(&rdata->rp_mutex); |
| fc_rport_logoff(rdata); |
| mutex_lock(&lport->disc.disc_mutex); |
| new_rdata = fc_rport_create(lport, rdata->ids.port_id); |
| mutex_unlock(&lport->disc.disc_mutex); |
| if (new_rdata) { |
| new_rdata->disc_id = disc->disc_id; |
| fc_rport_login(new_rdata); |
| } |
| goto out; |
| } |
| rdata->disc_id = disc->disc_id; |
| mutex_unlock(&rdata->rp_mutex); |
| fc_rport_login(rdata); |
| } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { |
| FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n", |
| cp->ct_reason, cp->ct_explan); |
| fc_rport_logoff(rdata); |
| } else { |
| FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n", |
| ntohs(cp->ct_cmd)); |
| redisc: |
| mutex_lock(&disc->disc_mutex); |
| fc_disc_restart(disc); |
| mutex_unlock(&disc->disc_mutex); |
| } |
| out: |
| kref_put(&rdata->kref, fc_rport_destroy); |
| } |
| |
| /** |
| * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request |
| * @lport: The local port to initiate discovery on |
| * @rdata: remote port private data |
| * |
| * Locking Note: This function expects that the disc_mutex is locked |
| * before it is called. |
| * On failure, an error code is returned. |
| */ |
| static int fc_disc_gpn_id_req(struct fc_lport *lport, |
| struct fc_rport_priv *rdata) |
| { |
| struct fc_frame *fp; |
| |
| fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + |
| sizeof(struct fc_ns_fid)); |
| if (!fp) |
| return -ENOMEM; |
| if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID, |
| fc_disc_gpn_id_resp, rdata, |
| 3 * lport->r_a_tov)) |
| return -ENOMEM; |
| kref_get(&rdata->kref); |
| return 0; |
| } |
| |
| /** |
| * fc_disc_single() - Discover the directory information for a single target |
| * @lport: The local port the remote port is associated with |
| * @dp: The port to rediscover |
| * |
| * Locking Note: This function expects that the disc_mutex is locked |
| * before it is called. |
| */ |
| static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp) |
| { |
| struct fc_rport_priv *rdata; |
| |
| rdata = fc_rport_create(lport, dp->port_id); |
| if (!rdata) |
| return -ENOMEM; |
| rdata->disc_id = 0; |
| return fc_disc_gpn_id_req(lport, rdata); |
| } |
| |
| /** |
| * fc_disc_stop() - Stop discovery for a given lport |
| * @lport: The local port that discovery should stop on |
| */ |
| static void fc_disc_stop(struct fc_lport *lport) |
| { |
| struct fc_disc *disc = &lport->disc; |
| |
| if (disc->pending) |
| cancel_delayed_work_sync(&disc->disc_work); |
| fc_disc_stop_rports(disc); |
| } |
| |
| /** |
| * fc_disc_stop_final() - Stop discovery for a given lport |
| * @lport: The lport that discovery should stop on |
| * |
| * This function will block until discovery has been |
| * completely stopped and all rports have been deleted. |
| */ |
| static void fc_disc_stop_final(struct fc_lport *lport) |
| { |
| fc_disc_stop(lport); |
| fc_rport_flush_queue(); |
| } |
| |
| /** |
| * fc_disc_config() - Configure the discovery layer for a local port |
| * @lport: The local port that needs the discovery layer to be configured |
| * @priv: Private data structre for users of the discovery layer |
| */ |
| void fc_disc_config(struct fc_lport *lport, void *priv) |
| { |
| struct fc_disc *disc = &lport->disc; |
| |
| if (!lport->tt.disc_start) |
| lport->tt.disc_start = fc_disc_start; |
| |
| if (!lport->tt.disc_stop) |
| lport->tt.disc_stop = fc_disc_stop; |
| |
| if (!lport->tt.disc_stop_final) |
| lport->tt.disc_stop_final = fc_disc_stop_final; |
| |
| if (!lport->tt.disc_recv_req) |
| lport->tt.disc_recv_req = fc_disc_recv_req; |
| |
| disc = &lport->disc; |
| |
| disc->priv = priv; |
| } |
| EXPORT_SYMBOL(fc_disc_config); |
| |
| /** |
| * fc_disc_init() - Initialize the discovery layer for a local port |
| * @lport: The local port that needs the discovery layer to be initialized |
| */ |
| void fc_disc_init(struct fc_lport *lport) |
| { |
| struct fc_disc *disc = &lport->disc; |
| |
| INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout); |
| mutex_init(&disc->disc_mutex); |
| INIT_LIST_HEAD(&disc->rports); |
| } |
| EXPORT_SYMBOL(fc_disc_init); |