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[SCSI] libfc: do not log off rports before or after discovery

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When receiving an RSCN, do not log off all rports.  This is
extremely disruptive.  If, after the GPN_FT response, some
rports haven't been listed, delete them.

Add field disc_id to structs fc_rport_priv and fc_disc.
disc_id is an arbitrary serial number used to identify the
rports found by the latest discovery.  This eliminates the need
to go through the rport list when restarting discovery.

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>
This commit is contained in:
Joe Eykholt 2009-08-25 14:02:11 -07:00 committed by James Bottomley
parent 8025b5db7e
commit 0f6c614987
2 changed files with 37 additions and 13 deletions
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47
drivers/scsi/libfc/fc_disc.c
View file

@ -221,17 +221,19 @@ static void fc_disc_recv_req(struct fc_seq *sp, struct fc_frame *fp,
*/
static void fc_disc_restart(struct fc_disc *disc)
{
struct fc_rport_priv *rdata, *next;
struct fc_lport *lport = disc->lport;
FC_DISC_DBG(disc, "Restarting discovery\n");
list_for_each_entry_safe(rdata, next, &disc->rports, peers)
lport->tt.rport_logoff(rdata);
disc->requested = 1;
if (!disc->pending)
fc_disc_gpn_ft_req(disc);
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;
fc_disc_gpn_ft_req(disc);
}
/**
@ -278,6 +280,7 @@ static void fc_disc_start(void (*disc_callback)(struct fc_lport *,
}
kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy);
} else {
disc->disc_id = (disc->disc_id + 2) | 1;
fc_disc_gpn_ft_req(disc); /* get ports by FC-4 type */
}
@ -345,13 +348,30 @@ static int fc_disc_new_target(struct fc_disc *disc,
static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event)
{
struct fc_lport *lport = disc->lport;
struct fc_rport_priv *rdata;
FC_DISC_DBG(disc, "Discovery complete\n");
if (disc->requested)
fc_disc_gpn_ft_req(disc);
else
disc->pending = 0;
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(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);
@ -496,7 +516,7 @@ static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)
ids.port_name != lport->wwpn) {
rdata = lport->tt.rport_create(lport, &ids);
if (rdata)
lport->tt.rport_login(rdata);
rdata->disc_id = disc->disc_id;
else
printk(KERN_WARNING "libfc: Failed to allocate "
"memory for the newly discovered port "
@ -640,6 +660,7 @@ static void fc_disc_single(struct fc_disc *disc, struct fc_disc_port *dp)
rdata = lport->tt.rport_create(lport, &dp->ids);
if (rdata) {
rdata->disc_id = disc->disc_id;
kfree(dp);
lport->tt.rport_login(rdata);
}

3
include/scsi/libfc.h
View file

@ -202,6 +202,7 @@ struct fc_rport_libfc_priv {
* @ids: remote port identifiers and roles
* @flags: REC and RETRY supported flags
* @max_seq: maximum number of concurrent sequences
* @disc_id: discovery identifier
* @maxframe_size: maximum frame size
* @retries: retry count in current state
* @e_d_tov: error detect timeout value (in msec)
@ -218,6 +219,7 @@ struct fc_rport_priv {
struct fc_rport_identifiers ids;
u16 flags;
u16 max_seq;
u16 disc_id;
u16 maxframe_size;
unsigned int retries;
unsigned int e_d_tov;
@ -678,6 +680,7 @@ struct fc_disc {
unsigned char requested;
unsigned short seq_count;
unsigned char buf_len;
u16 disc_id;
void (*disc_callback)(struct fc_lport *,
enum fc_disc_event);