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[SCSI] fcoe, libfc: fix an libfc issue with queue ramp down in libfc 

The cmd_per_lun value is used by scsi-ml as fall back lowest
queue_depth value but in case of libfc cmd_per_lun is set to
same value as max queue_depth = 32.

So this patch reduces cmd_per_lun value to 3 and configures
each lun with default max queue_depth 32 in fc_slave_alloc.

Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Acked-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Vasu Dev 2009-10-15 17:46:55 -07:00 committed by James Bottomley
parent 5c20848a09
commit 14caf44c69
2 changed files with 7 additions and 9 deletions
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2
drivers/scsi/fcoe/fcoe.c
View File

@ -137,7 +137,7 @@ static struct scsi_host_template fcoe_shost_template = {
.change_queue_depth = fc_change_queue_depth,
.change_queue_type = fc_change_queue_type,
.this_id = -1,
.cmd_per_lun = 32,
.cmd_per_lun = 3,
.can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
.use_clustering = ENABLE_CLUSTERING,
.sg_tablesize = SG_ALL,

14
drivers/scsi/libfc/fc_fcp.c
View File

@ -2033,18 +2033,16 @@ EXPORT_SYMBOL(fc_eh_host_reset);
int fc_slave_alloc(struct scsi_device *sdev)
{
struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
int queue_depth;
if (!rport || fc_remote_port_chkready(rport))
return -ENXIO;
if (sdev->tagged_supported) {
if (sdev->host->hostt->cmd_per_lun)
queue_depth = sdev->host->hostt->cmd_per_lun;
else
queue_depth = FC_FCP_DFLT_QUEUE_DEPTH;
scsi_activate_tcq(sdev, queue_depth);
}
if (sdev->tagged_supported)
scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
else
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
FC_FCP_DFLT_QUEUE_DEPTH);
return 0;
}
EXPORT_SYMBOL(fc_slave_alloc);