mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 18:41:23 +00:00
9226115695
Incoming requests shouldn't require a local exchange if we're just going to reply with one or two frames and don't expect anything further. Don't allocate exchanges for such requests until requested by the upper-layer protocol. The sequence is always NULL for new requests, so remove that as an argument to request handlers. Also change the first argument to lport->tt.seq_els_rsp_send from the sequence pointer to the received frame pointer, to supply the exchange IDs and destination ID info. Signed-off-by: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
736 lines
20 KiB
C
736 lines
20 KiB
C
/*
|
|
* 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 <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.
|
|
*/
|
|
void fc_disc_stop_rports(struct fc_disc *disc)
|
|
{
|
|
struct fc_lport *lport;
|
|
struct fc_rport_priv *rdata;
|
|
|
|
lport = fc_disc_lport(disc);
|
|
|
|
mutex_lock(&disc->disc_mutex);
|
|
list_for_each_entry_rcu(rdata, &disc->rports, peers)
|
|
lport->tt.rport_logoff(rdata);
|
|
mutex_unlock(&disc->disc_mutex);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
}
|
|
lport->tt.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;
|
|
lport->tt.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);
|
|
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.
|
|
*/
|
|
list_for_each_entry_rcu(rdata, &disc->rports, peers) {
|
|
if (!rdata->disc_id)
|
|
continue;
|
|
if (rdata->disc_id == disc->disc_id)
|
|
lport->tt.rport_login(rdata);
|
|
else
|
|
lport->tt.rport_logoff(rdata);
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 = lport->tt.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;
|
|
|
|
mutex_lock(&disc->disc_mutex);
|
|
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);
|
|
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);
|
|
lport->tt.rport_logoff(rdata);
|
|
|
|
new_rdata = lport->tt.rport_create(lport,
|
|
rdata->ids.port_id);
|
|
if (new_rdata) {
|
|
new_rdata->disc_id = disc->disc_id;
|
|
lport->tt.rport_login(new_rdata);
|
|
}
|
|
goto out;
|
|
}
|
|
rdata->disc_id = disc->disc_id;
|
|
lport->tt.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);
|
|
lport->tt.rport_logoff(rdata);
|
|
} else {
|
|
FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n",
|
|
ntohs(cp->ct_cmd));
|
|
redisc:
|
|
fc_disc_restart(disc);
|
|
}
|
|
out:
|
|
mutex_unlock(&disc->disc_mutex);
|
|
kref_put(&rdata->kref, lport->tt.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 = lport->tt.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
|
|
*/
|
|
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 on
|
|
*
|
|
* 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 layer for a local port
|
|
* @lport: The local port that needs the discovery layer to be initialized
|
|
*/
|
|
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;
|
|
|
|
disc = &lport->disc;
|
|
INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout);
|
|
mutex_init(&disc->disc_mutex);
|
|
INIT_LIST_HEAD(&disc->rports);
|
|
|
|
disc->priv = lport;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(fc_disc_init);
|