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| author |   Sasikumar Chandrasekaran <sasikumar.pc@broadcom.com> | 2017-01-10 18:20:46 -0500 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2017-01-10 23:15:45 -0500 |
| commit | fdd84e2514b0157219720cf8f3f55757938a39cd (patch) | |
| tree | dbaad7466ef255f06bc240c9361bb57e6bf3145e /drivers/scsi/megaraid/megaraid_sas_fp.c | |
| parent | scsi: megaraid_sas: EEDP Escape Mode Support for SAS3.5 Generic Megaraid Controllers (diff) | |
| download | linux-dev-fdd84e2514b0157219720cf8f3f55757938a39cd.tar.xz linux-dev-fdd84e2514b0157219720cf8f3f55757938a39cd.zip | |
scsi: megaraid_sas: SAS3.5 Generic Megaraid Controllers Stream Detection and IO Coalescing
Detect sequential Write IOs and pass the hint that it is part of sequential
stream to help HBA Firmware do the Full Stripe Writes. For read IOs on
certain RAID volumes like Read Ahead volumes,this will help driver to
send it to Firmware even if the IOs can potentially be sent to
hardware directly (called fast path) bypassing firmware.
Design: 8 streams are maintained per RAID volume as per the combined
firmware/driver design. When there is no stream detected the LRU stream
is used for next potential stream and LRU/MRU map is updated to make this
as MRU stream. Every time a stream is detected the MRU map
is updated to make the current stream as MRU stream.
Signed-off-by: Sasikumar Chandrasekaran <sasikumar.pc@broadcom.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/megaraid/megaraid_sas_fp.c')
| -rw-r--r-- | drivers/scsi/megaraid/megaraid_sas_fp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/megaraid/megaraid_sas_fp.c b/drivers/scsi/megaraid/megaraid_sas_fp.c index f237d0003df3..a4e213be69d2 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fp.c +++ b/drivers/scsi/megaraid/megaraid_sas_fp.c @@ -935,6 +935,8 @@ MR_BuildRaidContext(struct megasas_instance *instance, ld = MR_TargetIdToLdGet(ldTgtId, map); raid = MR_LdRaidGet(ld, map); + /*check read ahead bit*/ + io_info->ra_capable = raid->capability.ra_capable; /* * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero |