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authorMichael Reed <mdr@sgi.com>2009-04-06 22:33:47 -0700
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2009-05-20 17:21:10 -0500
commita13d8ac057705c479b8bf15e5303f18f899502f9 (patch)
treea97f78dd93e9432bc1eb63be512acc7a74a3791b /drivers/scsi/qla2xxx/qla_gbl.h
parente1f916035f149540e5090207ceafca9ba779084e (diff)
[SCSI] qla2xxx: Conditionally disable automatic queue full tracking.
Changing a lun's queue depth (/sys/block/sdX/device/queue_depth) isn't sticky when the device is connected via a QLogic fibre channel adapter. The QLogic qla2xxx fibre channel driver dynamically adjusts a lun's queue depth. If a user has a specific need to limit the number of commands issued to a lun (say a tape drive, or a shared raid where the total commands issued to all luns is limited at the controller level, for example) and writes a limiting value to /sys/block/sdXX/device/queue_depth, the qla2xxx driver will silently and gradually increase the queue depth back to the driver limit of ql2xmaxqdepth. While reducing this value (module parameter) or increasing the interval between ramp ups (ql2xqfullrampup) offers the potential for a work around it would be better to have the option of just disabling the dynamic adjustment of queue depth. This patch implements an "off switch" as a module parameter. Signed-off-by: Michael Reed <mdr@sgi.com> Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/qla2xxx/qla_gbl.h')
-rw-r--r--drivers/scsi/qla2xxx/qla_gbl.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/qla2xxx/qla_gbl.h b/drivers/scsi/qla2xxx/qla_gbl.h
index b12de0176246..5347e35e7d61 100644
--- a/drivers/scsi/qla2xxx/qla_gbl.h
+++ b/drivers/scsi/qla2xxx/qla_gbl.h
@@ -65,6 +65,7 @@ extern int ql2xfdmienable;
extern int ql2xallocfwdump;
extern int ql2xextended_error_logging;
extern int ql2xqfullrampup;
+extern int ql2xqfulltracking;
extern int ql2xiidmaenable;
extern int ql2xmaxqueues;
extern int ql2xmultique_tag;