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authorHannes Reinecke <hare@suse.de>2017-04-27 16:25:03 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2017-05-08 21:24:28 -0400
commitc1061255031dea76ee9e082d081b88ac6d6c8265 (patch)
tree188ba40ab912146d50ee801bb645a23b410d3601 /drivers/scsi
parent2d3e4866dea96b0506395b47bfefb234f2088dac (diff)
downloadlinux-c1061255031dea76ee9e082d081b88ac6d6c8265.tar.bz2
scsi: libfc: do not flood console with messages 'libfc: queue full ...'
When the FCoE sending side becomes congested libfc tries to reduce the queue depth on the host; however due to the built-in lag before attempting to ramp down the queue depth _again_ the message log is flooded with the following message: libfc: queue full, reducing can_queue to 512 With this patch the message is printed only once (ie when it's actually changed). Signed-off-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com> Acked-by: Johannes Thumshirn <jth@kernel.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/libfc/fc_fcp.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c
index a808e8ef1d08..234352da5c3c 100644
--- a/drivers/scsi/libfc/fc_fcp.c
+++ b/drivers/scsi/libfc/fc_fcp.c
@@ -407,11 +407,12 @@ unlock:
* can_queue. Eventually we will hit the point where we run
* on all reserved structs.
*/
-static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
+static bool fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
{
struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
unsigned long flags;
int can_queue;
+ bool changed = false;
spin_lock_irqsave(lport->host->host_lock, flags);
@@ -427,9 +428,11 @@ static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
if (!can_queue)
can_queue = 1;
lport->host->can_queue = can_queue;
+ changed = true;
unlock:
spin_unlock_irqrestore(lport->host->host_lock, flags);
+ return changed;
}
/*
@@ -1896,11 +1899,11 @@ int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd)
if (!fc_fcp_lport_queue_ready(lport)) {
if (lport->qfull) {
- fc_fcp_can_queue_ramp_down(lport);
- shost_printk(KERN_ERR, lport->host,
- "libfc: queue full, "
- "reducing can_queue to %d.\n",
- lport->host->can_queue);
+ if (fc_fcp_can_queue_ramp_down(lport))
+ shost_printk(KERN_ERR, lport->host,
+ "libfc: queue full, "
+ "reducing can_queue to %d.\n",
+ lport->host->can_queue);
}
rc = SCSI_MLQUEUE_HOST_BUSY;
goto out;