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[SCSI] ibmvfc: Delay NPIV login retry and add retries 

Adds a delay prior to retrying a failed NPIV login. This fixes
a scenario if the backing fibre channel adapter is getting reset
due to an EEH event, NPIV login will fail. Currently, ibmvfc
retries three times very quickly, resets the CRQ and tries one
more time. If the adapter is getting reset due to EEH, this isn't
enough time. This adds a delay prior to retrying a failed NPIV
login and also increments the number of retries.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Brian King 2008-12-03 11:02:54 -06:00 committed by James Bottomley
parent 6df19a791b
commit 1c41fa8288
2 changed files with 15 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/scsi/ibmvscsi/ibmvfc.c
View File

@ -561,7 +561,7 @@ static void ibmvfc_init_host(struct ibmvfc_host *vhost, int relogin)
struct ibmvfc_target *tgt;
if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
if (++vhost->init_retries > IBMVFC_MAX_INIT_RETRIES) {
if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
dev_err(vhost->dev,
"Host initialization retries exceeded. Taking adapter offline\n");
ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
@ -845,11 +845,12 @@ static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
static void ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
{
if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
if (++vhost->init_retries > IBMVFC_MAX_INIT_RETRIES) {
vhost->delay_init = 1;
if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
dev_err(vhost->dev,
"Host initialization retries exceeded. Taking adapter offline\n");
ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
} else if (vhost->init_retries == IBMVFC_MAX_INIT_RETRIES)
} else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
__ibmvfc_reset_host(vhost);
else
ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
@ -2756,7 +2757,7 @@ static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
static void ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
void (*job_step) (struct ibmvfc_target *))
{
if (++tgt->init_retries > IBMVFC_MAX_INIT_RETRIES) {
if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
wake_up(&tgt->vhost->work_wait_q);
} else
@ -3613,6 +3614,12 @@ static void ibmvfc_do_work(struct ibmvfc_host *vhost)
break;
case IBMVFC_HOST_ACTION_INIT:
BUG_ON(vhost->state != IBMVFC_INITIALIZING);
if (vhost->delay_init) {
vhost->delay_init = 0;
spin_unlock_irqrestore(vhost->host->host_lock, flags);
ssleep(5);
return;
} else
vhost->job_step(vhost);
break;
case IBMVFC_HOST_ACTION_QUERY:

4
drivers/scsi/ibmvscsi/ibmvfc.h
View File

@ -43,7 +43,8 @@
#define IBMVFC_MAX_DISC_THREADS 4
#define IBMVFC_TGT_MEMPOOL_SZ 64
#define IBMVFC_MAX_CMDS_PER_LUN 64
#define IBMVFC_MAX_INIT_RETRIES 3
#define IBMVFC_MAX_HOST_INIT_RETRIES 6
#define IBMVFC_MAX_TGT_INIT_RETRIES 3
#define IBMVFC_DEV_LOSS_TMO (5 * 60)
#define IBMVFC_DEFAULT_LOG_LEVEL 2
#define IBMVFC_MAX_CDB_LEN 16
@ -673,6 +674,7 @@ struct ibmvfc_host {
int discovery_threads;
int client_migrated;
int reinit;
int delay_init;
int events_to_log;
#define IBMVFC_AE_LINKUP 0x0001
#define IBMVFC_AE_LINKDOWN 0x0002