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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>
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
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/scsi/megaraid/megaraid_sas.h
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@@ -1353,6 +1353,12 @@ enum DCMD_TIMEOUT_ACTION {
KILL_ADAPTER = 1,
IGNORE_TIMEOUT = 2,
};
enum FW_BOOT_CONTEXT {
PROBE_CONTEXT = 0,
OCR_CONTEXT = 1,
};
/* Frame Type */
#define IO_FRAME 0
#define PTHRU_FRAME 1
@@ -2038,6 +2044,8 @@ struct megasas_instance {
u16 max_fw_cmds;
u16 max_mfi_cmds;
u16 max_scsi_cmds;
u16 ldio_threshold;
u16 cur_can_queue;
u32 max_sectors_per_req;
struct megasas_aen_event *ev;
@@ -2068,6 +2076,7 @@ struct megasas_instance {
u32 fw_support_ieee;
atomic_t fw_outstanding;
atomic_t ldio_outstanding;
atomic_t fw_reset_no_pci_access;
struct megasas_instance_template *instancet;