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[SCSI] libfcoe: add tracking FIP Missing Discovery Advertisement count 

Add tracking the Missing Discovery Advertisement count for FIP Fiber Channel
Forwarder (FCF) as described in FC-BB-5 Rev2.0 for LESB. The time is 1.5 times
the FKA_ADV_PERIOD of the corresponding FCF.

Signed-off-by: Yi Zou <yi.zou@intel.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:
Yi Zou 2009-11-20 14:55:08 -08:00 committed by James Bottomley
parent 2ec8493f96
commit f3da80e761
1 changed files with 14 additions and 0 deletions
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14
drivers/scsi/fcoe/libfcoe.c
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@ -562,14 +562,28 @@ EXPORT_SYMBOL(fcoe_ctlr_els_send);
* times its keep-alive period including fuzz.
*
* In addition, determine the time when an FCF selection can occur.
*
* Also, increment the MissDiscAdvCount when no advertisement is received
* for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB).
*/
static void fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
{
struct fcoe_fcf *fcf;
struct fcoe_fcf *next;
unsigned long sel_time = 0;
unsigned long mda_time = 0;
list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
mda_time = fcf->fka_period + (fcf->fka_period >> 1);
if ((fip->sel_fcf == fcf) &&
(time_after(jiffies, fcf->time + mda_time))) {
mod_timer(&fip->timer, jiffies + mda_time);
fc_lport_get_stats(fip->lp)->MissDiscAdvCount++;
printk(KERN_INFO "libfcoe: host%d: Missing Discovery "
"Advertisement for fab %llx count %lld\n",
fip->lp->host->host_no, fcf->fabric_name,
fc_lport_get_stats(fip->lp)->MissDiscAdvCount);
}
if (time_after(jiffies, fcf->time + fcf->fka_period * 3 +
msecs_to_jiffies(FIP_FCF_FUZZ * 3))) {
if (fip->sel_fcf == fcf)