megaraid_sas: Dual queue depth support

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1. For iMR controllers, firmware will report two queue depths:

   - Controller-wide queue depth
   - LDIO queue depth (240)

Controller-wide queue depth will be greater among the two. Using this
new feature, iMR can provide larger Queue depth(QD) for JBOD and limited
QD for Virtual Disk(VD).

2. megaraid_sas driver will throttle read/write LDIOs based on "LDIO
Queue Depth".

3. Dual queue depth can be enabled/disabled via module parameter. It is
enabled by default if the firmware supports it. Only specific firmware
builds will enable the feature.

4. Added sysfs parameter "ldio_outstanding" which permits querying the
number of outstanding LDIO requests at runtime.

Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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This commit is contained in:

Sumit Saxena 2016-01-28 21:04:30 +05:30 • committed by Martin K. Petersen

parent f9a9dee6a1

commit 308ec459bc

3 changed files with 107 additions and 10 deletions

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9

drivers/scsi/megaraid/megaraid_sas.h

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20

drivers/scsi/megaraid/megaraid_sas_base.c

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88

drivers/scsi/megaraid/megaraid_sas_fusion.c

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