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749 lines
20 KiB
749 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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* Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. |
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* |
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* Maintained at www.Open-FCoE.org |
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*/ |
|
|
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/* |
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* Target Discovery |
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* |
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* This block discovers all FC-4 remote ports, including FCP initiators. It |
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* also handles RSCN events and re-discovery if necessary. |
|
*/ |
|
|
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/* |
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* DISC LOCKING |
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* |
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* The disc mutex is can be locked when acquiring rport locks, but may not |
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* be held when acquiring the lport lock. Refer to fc_lport.c for more |
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* details. |
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*/ |
|
|
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#include <linux/timer.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include <linux/export.h> |
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#include <linux/rculist.h> |
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|
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#include <asm/unaligned.h> |
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|
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#include <scsi/fc/fc_gs.h> |
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|
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#include <scsi/libfc.h> |
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|
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#include "fc_libfc.h" |
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|
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#define FC_DISC_RETRY_LIMIT 3 /* max retries */ |
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#define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ |
|
|
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static void fc_disc_gpn_ft_req(struct fc_disc *); |
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static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *); |
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static void fc_disc_done(struct fc_disc *, enum fc_disc_event); |
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static void fc_disc_timeout(struct work_struct *); |
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static int fc_disc_single(struct fc_lport *, struct fc_disc_port *); |
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static void fc_disc_restart(struct fc_disc *); |
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|
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/** |
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* fc_disc_stop_rports() - Delete all the remote ports associated with the lport |
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* @disc: The discovery job to stop remote ports on |
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*/ |
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static void fc_disc_stop_rports(struct fc_disc *disc) |
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{ |
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struct fc_rport_priv *rdata; |
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|
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lockdep_assert_held(&disc->disc_mutex); |
|
|
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list_for_each_entry(rdata, &disc->rports, peers) { |
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if (kref_get_unless_zero(&rdata->kref)) { |
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fc_rport_logoff(rdata); |
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kref_put(&rdata->kref, fc_rport_destroy); |
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} |
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} |
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} |
|
|
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/** |
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* fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN) |
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* @disc: The discovery object to which the RSCN applies |
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* @fp: The RSCN frame |
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*/ |
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static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp) |
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{ |
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struct fc_lport *lport; |
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struct fc_els_rscn *rp; |
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struct fc_els_rscn_page *pp; |
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struct fc_seq_els_data rjt_data; |
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unsigned int len; |
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int redisc = 0; |
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enum fc_els_rscn_ev_qual ev_qual; |
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enum fc_els_rscn_addr_fmt fmt; |
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LIST_HEAD(disc_ports); |
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struct fc_disc_port *dp, *next; |
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|
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lockdep_assert_held(&disc->disc_mutex); |
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|
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lport = fc_disc_lport(disc); |
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|
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FC_DISC_DBG(disc, "Received an RSCN event\n"); |
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|
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/* make sure the frame contains an RSCN message */ |
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rp = fc_frame_payload_get(fp, sizeof(*rp)); |
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if (!rp) |
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goto reject; |
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/* make sure the page length is as expected (4 bytes) */ |
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if (rp->rscn_page_len != sizeof(*pp)) |
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goto reject; |
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/* get the RSCN payload length */ |
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len = ntohs(rp->rscn_plen); |
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if (len < sizeof(*rp)) |
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goto reject; |
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/* make sure the frame contains the expected payload */ |
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rp = fc_frame_payload_get(fp, len); |
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if (!rp) |
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goto reject; |
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/* payload must be a multiple of the RSCN page size */ |
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len -= sizeof(*rp); |
|
if (len % sizeof(*pp)) |
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goto reject; |
|
|
|
for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) { |
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ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT; |
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ev_qual &= ELS_RSCN_EV_QUAL_MASK; |
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fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT; |
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fmt &= ELS_RSCN_ADDR_FMT_MASK; |
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/* |
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* if we get an address format other than port |
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* (area, domain, fabric), then do a full discovery |
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*/ |
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switch (fmt) { |
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case ELS_ADDR_FMT_PORT: |
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FC_DISC_DBG(disc, "Port address format for port " |
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"(%6.6x)\n", ntoh24(pp->rscn_fid)); |
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dp = kzalloc(sizeof(*dp), GFP_KERNEL); |
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if (!dp) { |
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redisc = 1; |
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break; |
|
} |
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dp->lp = lport; |
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dp->port_id = ntoh24(pp->rscn_fid); |
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list_add_tail(&dp->peers, &disc_ports); |
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break; |
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case ELS_ADDR_FMT_AREA: |
|
case ELS_ADDR_FMT_DOM: |
|
case ELS_ADDR_FMT_FAB: |
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default: |
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FC_DISC_DBG(disc, "Address format is (%d)\n", fmt); |
|
redisc = 1; |
|
break; |
|
} |
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} |
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fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL); |
|
|
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/* |
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* If not doing a complete rediscovery, do GPN_ID on |
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* the individual ports mentioned in the list. |
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* If any of these get an error, do a full rediscovery. |
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* In any case, go through the list and free the entries. |
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*/ |
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list_for_each_entry_safe(dp, next, &disc_ports, peers) { |
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list_del(&dp->peers); |
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if (!redisc) |
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redisc = fc_disc_single(lport, dp); |
|
kfree(dp); |
|
} |
|
if (redisc) { |
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FC_DISC_DBG(disc, "RSCN received: rediscovering\n"); |
|
fc_disc_restart(disc); |
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} else { |
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FC_DISC_DBG(disc, "RSCN received: not rediscovering. " |
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"redisc %d state %d in_prog %d\n", |
|
redisc, lport->state, disc->pending); |
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} |
|
fc_frame_free(fp); |
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return; |
|
reject: |
|
FC_DISC_DBG(disc, "Received a bad RSCN frame\n"); |
|
rjt_data.reason = ELS_RJT_LOGIC; |
|
rjt_data.explan = ELS_EXPL_NONE; |
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fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); |
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fc_frame_free(fp); |
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} |
|
|
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/** |
|
* fc_disc_recv_req() - Handle incoming requests |
|
* @lport: The local port receiving the request |
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* @fp: The request frame |
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* |
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* Locking Note: This function is called from the EM and will lock |
|
* the disc_mutex before calling the handler for the |
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* request. |
|
*/ |
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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; |
|
} |
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} |
|
|
|
/** |
|
* fc_disc_restart() - Restart discovery |
|
* @disc: The discovery object to be restarted |
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*/ |
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static void fc_disc_restart(struct fc_disc *disc) |
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{ |
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lockdep_assert_held(&disc->disc_mutex); |
|
|
|
if (!disc->disc_callback) |
|
return; |
|
|
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FC_DISC_DBG(disc, "Restarting discovery\n"); |
|
|
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disc->requested = 1; |
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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); |
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disc->disc_callback = disc_callback; |
|
fc_disc_restart(disc); |
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mutex_unlock(&disc->disc_mutex); |
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} |
|
|
|
/** |
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* fc_disc_done() - Discovery has been completed |
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* @disc: The discovery context |
|
* @event: The discovery completion status |
|
*/ |
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static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event) |
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{ |
|
struct fc_lport *lport = fc_disc_lport(disc); |
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struct fc_rport_priv *rdata; |
|
|
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lockdep_assert_held(&disc->disc_mutex); |
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FC_DISC_DBG(disc, "Discovery complete\n"); |
|
|
|
disc->pending = 0; |
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if (disc->requested) { |
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fc_disc_restart(disc); |
|
return; |
|
} |
|
|
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/* |
|
* Go through all remote ports. If they were found in the latest |
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* 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. |
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* |
|
* We don't need to use the _rcu variant here as the rport list |
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* is protected by the disc mutex which is already held on entry. |
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*/ |
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list_for_each_entry(rdata, &disc->rports, peers) { |
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if (!kref_get_unless_zero(&rdata->kref)) |
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continue; |
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if (rdata->disc_id) { |
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if (rdata->disc_id == disc->disc_id) |
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fc_rport_login(rdata); |
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else |
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fc_rport_logoff(rdata); |
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} |
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kref_put(&rdata->kref, fc_rport_destroy); |
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} |
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mutex_unlock(&disc->disc_mutex); |
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disc->disc_callback(lport, event); |
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mutex_lock(&disc->disc_mutex); |
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} |
|
|
|
/** |
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* 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) |
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{ |
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struct fc_lport *lport = fc_disc_lport(disc); |
|
unsigned long delay = 0; |
|
|
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FC_DISC_DBG(disc, "Error %d, retries %d/%d\n", |
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PTR_ERR_OR_ZERO(fp), disc->retry_count, |
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FC_DISC_RETRY_LIMIT); |
|
|
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if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { |
|
/* |
|
* Memory allocation failure, or the exchange timed out, |
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* retry after delay. |
|
*/ |
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if (disc->retry_count < FC_DISC_RETRY_LIMIT) { |
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/* go ahead and retry */ |
|
if (!fp) |
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delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY); |
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else { |
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delay = msecs_to_jiffies(lport->e_d_tov); |
|
|
|
/* timeout faster first time */ |
|
if (!disc->retry_count) |
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delay /= 4; |
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} |
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disc->retry_count++; |
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schedule_delayed_work(&disc->disc_work, delay); |
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} else |
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fc_disc_done(disc, DISC_EV_FAILED); |
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} 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; |
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} |
|
} |
|
|
|
/** |
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* fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request |
|
* @disc: The discovery context |
|
*/ |
|
static void fc_disc_gpn_ft_req(struct fc_disc *disc) |
|
{ |
|
struct fc_frame *fp; |
|
struct fc_lport *lport = fc_disc_lport(disc); |
|
|
|
lockdep_assert_held(&disc->disc_mutex); |
|
|
|
WARN_ON(!fc_lport_test_ready(lport)); |
|
|
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disc->pending = 1; |
|
disc->requested = 0; |
|
|
|
disc->buf_len = 0; |
|
disc->seq_count = 0; |
|
fp = fc_frame_alloc(lport, |
|
sizeof(struct fc_ct_hdr) + |
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sizeof(struct fc_ns_gid_ft)); |
|
if (!fp) |
|
goto err; |
|
|
|
if (lport->tt.elsct_send(lport, 0, fp, |
|
FC_NS_GPN_FT, |
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fc_disc_gpn_ft_resp, |
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disc, 3 * lport->r_a_tov)) |
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return; |
|
err: |
|
fc_disc_error(disc, NULL); |
|
} |
|
|
|
/** |
|
* fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response. |
|
* @disc: The discovery context |
|
* @buf: The GPN_FT response buffer |
|
* @len: The size of response buffer |
|
* |
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* 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; |
|
|
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lport = fc_disc_lport(disc); |
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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; |
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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 |
|
* @disc_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, ERR_PTR(error)); |
|
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)) { |
|
mutex_lock(&disc->disc_mutex); |
|
fc_disc_restart(disc); |
|
mutex_unlock(&disc->disc_mutex); |
|
goto out; |
|
} |
|
|
|
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 free_fp; |
|
} |
|
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); |
|
} |
|
free_fp: |
|
fc_frame_free(fp); |
|
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 |
|
* |
|
* 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; |
|
|
|
lockdep_assert_held(&lport->disc.disc_mutex); |
|
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 |
|
*/ |
|
static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp) |
|
{ |
|
struct fc_rport_priv *rdata; |
|
|
|
lockdep_assert_held(&lport->disc.disc_mutex); |
|
|
|
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); |
|
mutex_lock(&disc->disc_mutex); |
|
fc_disc_stop_rports(disc); |
|
mutex_unlock(&disc->disc_mutex); |
|
} |
|
|
|
/** |
|
* 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; |
|
|
|
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);
|
|
|