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[SCSI] fcoe: removes fcoe_watchdog

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Removes periodic fcoe_watchdog timer used across all fcoe interface
maintained in fcoe_hostlist instead added new fcoe_queue_timer
per fcoe interface.

Added timer is armed only when some pending skb need to be flushed
as oppose to periodic 1 second fcoe_watchdog, since now
fcoe_queue_timer is used on demand thus set this to 2 jiffies.

Now fcoe_queue_timer is much simple than fcoe_watchdog using lock to
process all fcoe interface from fcoe_hostlist.

I noticed +ve performance result with using 2 jiffies timer as
this helps flushing fcoe_pending_queue quickly.

Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Vasu Dev 2009-05-06 10:52:40 -07:00 committed by James Bottomley
parent 4bb6b51533
commit 1047f22108
2 changed files with 19 additions and 34 deletions
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52
drivers/scsi/fcoe/fcoe.c
View File

@ -54,7 +54,6 @@ MODULE_LICENSE("GPL v2");
/* fcoe host list */
LIST_HEAD(fcoe_hostlist);
DEFINE_RWLOCK(fcoe_hostlist_lock);
DEFINE_TIMER(fcoe_timer, NULL, 0, 0);
DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
/* Function Prototypes */
@ -167,6 +166,18 @@ static int fcoe_lport_config(struct fc_lport *lp)
return 0;
}
/**
* fcoe_queue_timer() - fcoe queue timer
* @lp: the fc_lport pointer
*
* Calls fcoe_check_wait_queue on timeout
*
*/
static void fcoe_queue_timer(ulong lp)
{
fcoe_check_wait_queue((struct fc_lport *)lp, NULL);
}
/**
* fcoe_netdev_config() - Set up netdev for SW FCoE
* @lp : ptr to the fc_lport
@ -237,6 +248,7 @@ static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev)
}
skb_queue_head_init(&fc->fcoe_pending_queue);
fc->fcoe_pending_queue_active = 0;
setup_timer(&fc->timer, fcoe_queue_timer, (unsigned long)lp);
/* setup Source Mac Address */
memcpy(fc->ctlr.ctl_src_addr, fc->real_dev->dev_addr,
@ -387,6 +399,9 @@ static int fcoe_if_destroy(struct net_device *netdev)
/* Free existing skbs */
fcoe_clean_pending_queue(lp);
/* Stop the timer */
del_timer_sync(&fc->timer);
/* Free memory used by statistical counters */
fc_lport_free_stats(lp);
@ -1259,32 +1274,6 @@ int fcoe_percpu_receive_thread(void *arg)
return 0;
}
/**
* fcoe_watchdog() - fcoe timer callback
* @vp:
*
* This checks the pending queue length for fcoe and set lport qfull
* if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the
* fcoe_hostlist.
*
* Returns: 0 for success
*/
void fcoe_watchdog(ulong vp)
{
struct fcoe_softc *fc;
read_lock(&fcoe_hostlist_lock);
list_for_each_entry(fc, &fcoe_hostlist, list) {
if (fc->ctlr.lp)
fcoe_check_wait_queue(fc->ctlr.lp, NULL);
}
read_unlock(&fcoe_hostlist_lock);
fcoe_timer.expires = jiffies + (1 * HZ);
add_timer(&fcoe_timer);
}
/**
* fcoe_check_wait_queue() - attempt to clear the transmit backlog
* @lp: the fc_lport
@ -1333,6 +1322,8 @@ static void fcoe_check_wait_queue(struct fc_lport *lp, struct sk_buff *skb)
if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH)
lp->qfull = 0;
if (fc->fcoe_pending_queue.qlen && !timer_pending(&fc->timer))
mod_timer(&fc->timer, jiffies + 2);
fc->fcoe_pending_queue_active = 0;
out:
if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
@ -1809,10 +1800,6 @@ static int __init fcoe_init(void)
/* Setup link change notification */
fcoe_dev_setup();
setup_timer(&fcoe_timer, fcoe_watchdog, 0);
mod_timer(&fcoe_timer, jiffies + (10 * HZ));
fcoe_if_init();
return 0;
@ -1838,9 +1825,6 @@ static void __exit fcoe_exit(void)
fcoe_dev_cleanup();
/* Stop the timer */
del_timer_sync(&fcoe_timer);
/* releases the associated fcoe hosts */
list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list)
fcoe_if_destroy(fc->real_dev);

1
drivers/scsi/fcoe/fcoe.h
View File

@ -61,6 +61,7 @@ struct fcoe_softc {
struct packet_type fip_packet_type;
struct sk_buff_head fcoe_pending_queue;
u8 fcoe_pending_queue_active;
struct timer_list timer; /* queue timer */
struct fcoe_ctlr ctlr;
};