diff options
Diffstat (limited to 'drivers/scsi/libfc/fc_disc.c')
| -rw-r--r-- | drivers/scsi/libfc/fc_disc.c | 845 |
1 files changed, 845 insertions, 0 deletions
diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c new file mode 100644 index 000000000000..dd1564c9e04a --- /dev/null +++ b/drivers/scsi/libfc/fc_disc.c @@ -0,0 +1,845 @@ +/* + * 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/err.h> +#include <asm/unaligned.h> + +#include <scsi/fc/fc_gs.h> + +#include <scsi/libfc.h> + +#define FC_DISC_RETRY_LIMIT 3 /* max retries */ +#define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ + +#define FC_DISC_DELAY 3 + +static int fc_disc_debug; + +#define FC_DEBUG_DISC(fmt...) \ + do { \ + if (fc_disc_debug) \ + FC_DBG(fmt); \ + } while (0) + +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 int fc_disc_new_target(struct fc_disc *, struct fc_rport *, + struct fc_rport_identifiers *); +static void fc_disc_del_target(struct fc_disc *, struct fc_rport *); +static void fc_disc_done(struct fc_disc *); +static void fc_disc_timeout(struct work_struct *); +static void fc_disc_single(struct fc_disc *, struct fc_disc_port *); +static void fc_disc_restart(struct fc_disc *); + +/** + * fc_disc_lookup_rport - lookup a remote port by port_id + * @lport: Fibre Channel host port instance + * @port_id: remote port port_id to match + */ +struct fc_rport *fc_disc_lookup_rport(const struct fc_lport *lport, + u32 port_id) +{ + const struct fc_disc *disc = &lport->disc; + struct fc_rport *rport, *found = NULL; + struct fc_rport_libfc_priv *rdata; + int disc_found = 0; + + list_for_each_entry(rdata, &disc->rports, peers) { + rport = PRIV_TO_RPORT(rdata); + if (rport->port_id == port_id) { + disc_found = 1; + found = rport; + break; + } + } + + if (!disc_found) + found = NULL; + + return found; +} + +/** + * fc_disc_stop_rports - delete all the remote ports associated with the lport + * @disc: The discovery job to stop rports on + * + * Locking Note: This function expects that the lport mutex is locked before + * calling it. + */ +void fc_disc_stop_rports(struct fc_disc *disc) +{ + struct fc_lport *lport; + struct fc_rport *rport; + struct fc_rport_libfc_priv *rdata, *next; + + lport = disc->lport; + + mutex_lock(&disc->disc_mutex); + list_for_each_entry_safe(rdata, next, &disc->rports, peers) { + rport = PRIV_TO_RPORT(rdata); + list_del(&rdata->peers); + lport->tt.rport_logoff(rport); + } + + mutex_unlock(&disc->disc_mutex); +} + +/** + * fc_disc_rport_callback - Event handler for rport events + * @lport: The lport which is receiving the event + * @rport: The rport which the event has occured on + * @event: The event that occured + * + * Locking Note: The rport lock should not be held when calling + * this function. + */ +static void fc_disc_rport_callback(struct fc_lport *lport, + struct fc_rport *rport, + enum fc_rport_event event) +{ + struct fc_rport_libfc_priv *rdata = rport->dd_data; + struct fc_disc *disc = &lport->disc; + int found = 0; + + FC_DEBUG_DISC("Received a %d event for port (%6x)\n", event, + rport->port_id); + + if (event == RPORT_EV_CREATED) { + if (disc) { + found = 1; + mutex_lock(&disc->disc_mutex); + list_add_tail(&rdata->peers, &disc->rports); + mutex_unlock(&disc->disc_mutex); + } + } + + if (!found) + FC_DEBUG_DISC("The rport (%6x) is not maintained " + "by the discovery layer\n", rport->port_id); +} + +/** + * fc_disc_recv_rscn_req - Handle Registered State Change Notification (RSCN) + * @sp: Current sequence of the RSCN exchange + * @fp: RSCN Frame + * @lport: Fibre Channel host port instance + * + * Locking Note: This function expects that the disc_mutex is locked + * before it is called. + */ +static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp, + struct fc_disc *disc) +{ + struct fc_lport *lport; + struct fc_rport *rport; + struct fc_rport_libfc_priv *rdata; + 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 = disc->lport; + + FC_DEBUG_DISC("Received an RSCN event on port (%6x)\n", + fc_host_port_id(lport->host)); + + /* 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_DEBUG_DISC("Port address format for port (%6x)\n", + ntoh24(pp->rscn_fid)); + dp = kzalloc(sizeof(*dp), GFP_KERNEL); + if (!dp) { + redisc = 1; + break; + } + dp->lp = lport; + dp->ids.port_id = ntoh24(pp->rscn_fid); + dp->ids.port_name = -1; + dp->ids.node_name = -1; + dp->ids.roles = FC_RPORT_ROLE_UNKNOWN; + 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_DEBUG_DISC("Address format is (%d)\n", fmt); + redisc = 1; + break; + } + } + lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL); + if (redisc) { + FC_DEBUG_DISC("RSCN received: rediscovering\n"); + fc_disc_restart(disc); + } else { + FC_DEBUG_DISC("RSCN received: not rediscovering. " + "redisc %d state %d in_prog %d\n", + redisc, lport->state, disc->pending); + list_for_each_entry_safe(dp, next, &disc_ports, peers) { + list_del(&dp->peers); + rport = lport->tt.rport_lookup(lport, dp->ids.port_id); + if (rport) { + rdata = RPORT_TO_PRIV(rport); + list_del(&rdata->peers); + lport->tt.rport_logoff(rport); + } + fc_disc_single(disc, dp); + } + } + fc_frame_free(fp); + return; +reject: + FC_DEBUG_DISC("Received a bad RSCN frame\n"); + rjt_data.fp = NULL; + rjt_data.reason = ELS_RJT_LOGIC; + rjt_data.explan = ELS_EXPL_NONE; + lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data); + fc_frame_free(fp); +} + +/** + * fc_disc_recv_req - Handle incoming requests + * @sp: Current sequence of the request exchange + * @fp: The frame + * @lport: The FC local port + * + * 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_seq *sp, struct fc_frame *fp, + struct fc_lport *lport) +{ + 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(sp, fp, disc); + mutex_unlock(&disc->disc_mutex); + break; + default: + FC_DBG("Received an unsupported request. opcode (%x)\n", op); + break; + } +} + +/** + * fc_disc_restart - Restart discovery + * @lport: FC discovery context + * + * Locking Note: This function expects that the disc mutex + * is already locked. + */ +static void fc_disc_restart(struct fc_disc *disc) +{ + struct fc_rport *rport; + struct fc_rport_libfc_priv *rdata, *next; + struct fc_lport *lport = disc->lport; + + FC_DEBUG_DISC("Restarting discovery for port (%6x)\n", + fc_host_port_id(lport->host)); + + list_for_each_entry_safe(rdata, next, &disc->rports, peers) { + rport = PRIV_TO_RPORT(rdata); + FC_DEBUG_DISC("list_del(%6x)\n", rport->port_id); + list_del(&rdata->peers); + lport->tt.rport_logoff(rport); + } + + disc->requested = 1; + if (!disc->pending) + fc_disc_gpn_ft_req(disc); +} + +/** + * fc_disc_start - Fibre Channel Target discovery + * @lport: FC local port + * + * Returns non-zero if discovery cannot be started. + */ +static void fc_disc_start(void (*disc_callback)(struct fc_lport *, + enum fc_disc_event), + struct fc_lport *lport) +{ + struct fc_rport *rport; + struct fc_rport_identifiers ids; + 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; + + /* + * If not ready, or already running discovery, just set request flag. + */ + disc->requested = 1; + + if (disc->pending) { + mutex_unlock(&disc->disc_mutex); + return; + } + + /* + * Handle point-to-point mode as a simple discovery + * of the remote port. Yucky, yucky, yuck, yuck! + */ + rport = disc->lport->ptp_rp; + if (rport) { + ids.port_id = rport->port_id; + ids.port_name = rport->port_name; + ids.node_name = rport->node_name; + ids.roles = FC_RPORT_ROLE_UNKNOWN; + get_device(&rport->dev); + + if (!fc_disc_new_target(disc, rport, &ids)) { + disc->event = DISC_EV_SUCCESS; + fc_disc_done(disc); + } + put_device(&rport->dev); + } else { + fc_disc_gpn_ft_req(disc); /* get ports by FC-4 type */ + } + + mutex_unlock(&disc->disc_mutex); +} + +static struct fc_rport_operations fc_disc_rport_ops = { + .event_callback = fc_disc_rport_callback, +}; + +/** + * fc_disc_new_target - Handle new target found by discovery + * @lport: FC local port + * @rport: The previous FC remote port (NULL if new remote port) + * @ids: Identifiers for the new FC remote port + * + * Locking Note: This function expects that the disc_mutex is locked + * before it is called. + */ +static int fc_disc_new_target(struct fc_disc *disc, + struct fc_rport *rport, + struct fc_rport_identifiers *ids) +{ + struct fc_lport *lport = disc->lport; + struct fc_rport_libfc_priv *rp; + int error = 0; + + if (rport && ids->port_name) { + if (rport->port_name == -1) { + /* + * Set WWN and fall through to notify of create. + */ + fc_rport_set_name(rport, ids->port_name, + rport->node_name); + } else if (rport->port_name != ids->port_name) { + /* + * This is a new port with the same FCID as + * a previously-discovered port. Presumably the old + * port logged out and a new port logged in and was + * assigned the same FCID. This should be rare. + * Delete the old one and fall thru to re-create. + */ + fc_disc_del_target(disc, rport); + rport = NULL; + } + } + if (((ids->port_name != -1) || (ids->port_id != -1)) && + ids->port_id != fc_host_port_id(lport->host) && + ids->port_name != lport->wwpn) { + if (!rport) { + rport = lport->tt.rport_lookup(lport, ids->port_id); + if (!rport) { + struct fc_disc_port dp; + dp.lp = lport; + dp.ids.port_id = ids->port_id; + dp.ids.port_name = ids->port_name; + dp.ids.node_name = ids->node_name; + dp.ids.roles = ids->roles; + rport = fc_rport_rogue_create(&dp); + } + if (!rport) + error = -ENOMEM; + } + if (rport) { + rp = rport->dd_data; + rp->ops = &fc_disc_rport_ops; + rp->rp_state = RPORT_ST_INIT; + lport->tt.rport_login(rport); + } + } + return error; +} + +/** + * fc_disc_del_target - Delete a target + * @disc: FC discovery context + * @rport: The remote port to be removed + */ +static void fc_disc_del_target(struct fc_disc *disc, struct fc_rport *rport) +{ + struct fc_lport *lport = disc->lport; + struct fc_rport_libfc_priv *rdata = RPORT_TO_PRIV(rport); + list_del(&rdata->peers); + lport->tt.rport_logoff(rport); +} + +/** + * fc_disc_done - Discovery has been completed + * @disc: FC discovery context + */ +static void fc_disc_done(struct fc_disc *disc) +{ + struct fc_lport *lport = disc->lport; + + FC_DEBUG_DISC("Discovery complete for port (%6x)\n", + fc_host_port_id(lport->host)); + + disc->disc_callback(lport, disc->event); + disc->event = DISC_EV_NONE; + + if (disc->requested) + fc_disc_gpn_ft_req(disc); + else + disc->pending = 0; +} + +/** + * fc_disc_error - Handle error on dNS request + * @disc: FC discovery context + * @fp: The frame pointer + */ +static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp) +{ + struct fc_lport *lport = disc->lport; + unsigned long delay = 0; + if (fc_disc_debug) + FC_DBG("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 { + /* exceeded retries */ + disc->event = DISC_EV_FAILED; + fc_disc_done(disc); + } + } +} + +/** + * fc_disc_gpn_ft_req - Send Get Port Names by FC-4 type (GPN_FT) request + * @lport: FC 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 = disc->lport; + + 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, NULL, fp, + FC_NS_GPN_FT, + fc_disc_gpn_ft_resp, + disc, lport->e_d_tov)) + return; +err: + fc_disc_error(disc, fp); +} + +/** + * fc_disc_gpn_ft_parse - Parse the list of IDs and names resulting from a request + * @lport: Fibre Channel host port instance + * @buf: GPN_FT response buffer + * @len: size of response buffer + */ +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_disc_port dp; + struct fc_rport *rport; + struct fc_rport_libfc_priv *rdata; + + lport = disc->lport; + + /* + * Handle partial name record left over from previous call. + */ + bp = buf; + plen = len; + np = (struct fc_gpn_ft_resp *)bp; + tlen = disc->buf_len; + 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)) { + dp.lp = lport; + dp.ids.port_id = ntoh24(np->fp_fid); + dp.ids.port_name = ntohll(np->fp_wwpn); + dp.ids.node_name = -1; + dp.ids.roles = FC_RPORT_ROLE_UNKNOWN; + + if ((dp.ids.port_id != fc_host_port_id(lport->host)) && + (dp.ids.port_name != lport->wwpn)) { + rport = fc_rport_rogue_create(&dp); + if (rport) { + rdata = rport->dd_data; + rdata->ops = &fc_disc_rport_ops; + rdata->local_port = lport; + lport->tt.rport_login(rport); + } else + FC_DBG("Failed to allocate memory for " + "the newly discovered port (%6x)\n", + dp.ids.port_id); + } + + if (np->fp_flags & FC_NS_FID_LAST) { + disc->event = DISC_EV_SUCCESS; + fc_disc_done(disc); + 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_DEBUG_DISC("Partial buffer remains " + "for discovery by (%6x)\n", + fc_host_port_id(lport->host)); + memcpy(&disc->partial_buf, np, len); + } + disc->buf_len = (unsigned char) len; + } else { + disc->buf_len = 0; + } + return error; +} + +/* + * Handle retry of memory allocation for remote ports. + */ +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); + if (disc->requested && !disc->pending) + 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: Current sequence of GPN_FT exchange + * @fp: response frame + * @lp_arg: Fibre Channel host port instance + * + * Locking Note: This function expects that the disc_mutex is locked + * before it is called. + */ +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; + unsigned int seq_cnt; + void *buf = NULL; + unsigned int len; + int error; + + FC_DEBUG_DISC("Received a GPN_FT response on port (%6x)\n", + fc_host_port_id(disc->lport->host)); + + if (IS_ERR(fp)) { + fc_disc_error(disc, fp); + 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_DBG("GPN_FT response too short, len %d\n", + fr_len(fp)); + } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) { + + /* + * Accepted. Parse response. + */ + buf = cp + 1; + len -= sizeof(*cp); + } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { + FC_DBG("GPN_FT rejected reason %x exp %x " + "(check zoning)\n", cp->ct_reason, + cp->ct_explan); + disc->event = DISC_EV_FAILED; + fc_disc_done(disc); + } else { + FC_DBG("GPN_FT unexpected response code %x\n", + ntohs(cp->ct_cmd)); + } + } else if (fr_sof(fp) == FC_SOF_N3 && + seq_cnt == disc->seq_count) { + buf = fh + 1; + } else { + FC_DBG("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)); + } + if (buf) { + error = fc_disc_gpn_ft_parse(disc, buf, len); + if (error) + fc_disc_error(disc, fp); + else + disc->seq_count++; + } + fc_frame_free(fp); +} + +/** + * fc_disc_single - Discover the directory information for a single target + * @lport: FC local port + * @dp: The port to rediscover + * + * Locking Note: This function expects that the disc_mutex is locked + * before it is called. + */ +static void fc_disc_single(struct fc_disc *disc, struct fc_disc_port *dp) +{ + struct fc_lport *lport; + struct fc_rport *rport; + struct fc_rport *new_rport; + struct fc_rport_libfc_priv *rdata; + + lport = disc->lport; + + if (dp->ids.port_id == fc_host_port_id(lport->host)) + goto out; + + rport = lport->tt.rport_lookup(lport, dp->ids.port_id); + if (rport) + fc_disc_del_target(disc, rport); + + new_rport = fc_rport_rogue_create(dp); + if (new_rport) { + rdata = new_rport->dd_data; + rdata->ops = &fc_disc_rport_ops; + kfree(dp); + lport->tt.rport_login(new_rport); + } + return; +out: + kfree(dp); +} + +/** + * fc_disc_stop - Stop discovery for a given lport + * @lport: The lport that discovery should stop for + */ +void fc_disc_stop(struct fc_lport *lport) +{ + struct fc_disc *disc = &lport->disc; + + if (disc) { + 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 for + * + * This function will block until discovery has been + * completely stopped and all rports have been deleted. + */ +void fc_disc_stop_final(struct fc_lport *lport) +{ + fc_disc_stop(lport); + lport->tt.rport_flush_queue(); +} + +/** + * fc_disc_init - Initialize the discovery block + * @lport: FC local port + */ +int fc_disc_init(struct fc_lport *lport) +{ + struct fc_disc *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; + + if (!lport->tt.rport_lookup) + lport->tt.rport_lookup = fc_disc_lookup_rport; + + disc = &lport->disc; + INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout); + mutex_init(&disc->disc_mutex); + INIT_LIST_HEAD(&disc->rports); + + disc->lport = lport; + disc->delay = FC_DISC_DELAY; + disc->event = DISC_EV_NONE; + + return 0; +} +EXPORT_SYMBOL(fc_disc_init); |