scsi: megaraid_sas: SAS3.5 Generic Megaraid Controllers Fast Path for RAID 1/10 Writes

To improve RAID 1/10 Write performance, OS drivers need to issue the
required Write IOs as Fast Path IOs (after the appropriate checks
allowing Fast Path to be used) to the appropriate physical drives
(translated from the OS logical IO) and wait for all Write IOs to complete.

Design: A write IO on RAID volume will be examined if it can be sent in
Fast Path based on IO size and starting LBA and ending LBA falling on to
a Physical Drive boundary. If the underlying RAID volume is a RAID 1/10,
driver issues two fast path write IOs one for each corresponding physical
drive after computing the corresponding start LBA for each physical drive.
Both write IOs will have the same payload and are posted to HW such that
replies land in the same reply queue.

If there are no resources available for sending two IOs, driver will send
the original IO from SCSI layer to RAID volume through the Firmware.

Based on PCI bandwidth and write payload, every second this feature is
enabled/disabled.

When both IOs are completed by HW, the resources will be released
and SCSI IO completion handler will be called.

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>

1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h
index 3909a26a5d31..3a5af3bb9989 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.h
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h
@@ -94,6 +94,7 @@ enum MR_RAID_FLAGS_IO_SUB_TYPE {
 #define MEGASAS_FP_CMD_LEN	16
 #define MEGASAS_FUSION_IN_RESET 0
 #define THRESHOLD_REPLY_COUNT 50
+#define RAID_1_10_RMW_CMDS 3
 #define JBOD_MAPS_COUNT	2
 
 enum MR_FUSION_ADAPTER_TYPE {
@@ -728,7 +729,9 @@ struct MR_SPAN_BLOCK_INFO {
 struct MR_LD_RAID {
 	struct {
 #if   defined(__BIG_ENDIAN_BITFIELD)
-		u32     reserved4:5;
+		u32     reserved4:3;
+		u32     fp_cache_bypass_capable:1;
+		u32     fp_rmw_capable:1;
 		u32     fpBypassRegionLock:1;
 		u32     tmCapable:1;
 		u32	fpNonRWCapable:1;
@@ -756,7 +759,9 @@ struct MR_LD_RAID {
 		u32	fpNonRWCapable:1;
 		u32     tmCapable:1;
 		u32     fpBypassRegionLock:1;
-		u32     reserved4:5;
+		u32     fp_rmw_capable:1;
+		u32     fp_cache_bypass_capable:1;
+		u32     reserved4:3;
 #endif
 	} capability;
 	__le32     reserved6;
@@ -830,6 +835,8 @@ struct IO_REQUEST_INFO {
 	u64 start_row;
 	u8  span_arm;	/* span[7:5], arm[4:0] */
 	u8  pd_after_lb;
+	u16 r1_alt_dev_handle; /* raid 1/10 only */
+	bool is_raid_1_fp_write;
 	bool ra_capable;
 };
 
@@ -883,6 +890,10 @@ struct megasas_cmd_fusion {
 	u32 index;
 	u8 pd_r1_lb;
 	struct completion done;
+	bool is_raid_1_fp_write;
+	u16 r1_alt_dev_handle; /* raid 1/10 only*/
+	bool cmd_completed;  /* raid 1/10 fp writes status holder */
+
 };
 
 struct LD_LOAD_BALANCE_INFO {