scsi: megaraid_sas: raid 1 fast path code optimize

No functional change. Code refactor.

Remove function megasas_fpio_to_ldio as we never require to convert fpio
to ldio because of frame unavailability.  Grab extra frame of raid 1
write fast path before it creates first frame as Fast Path.  Removed
is_raid_1_fp_write flag as raid 1 write fast path command is decided
using r1_alt_dev_handle only.  Move resetting megasas_cmd_fusion fields
at common function megasas_return_cmd_fusion.
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/megaraid/megaraid_sas_fp.c

@@ -1338,20 +1338,8 @@ MR_BuildRaidContext(struct megasas_instance *instance,
 					ref_in_start_stripe, io_info,
 					pRAID_Context, map);
 		/* If IO on an invalid Pd, then FP is not possible.*/
-		if (io_info->devHandle == cpu_to_le16(MR_PD_INVALID))
+		if (io_info->devHandle == MR_DEVHANDLE_INVALID)
 			io_info->fpOkForIo = FALSE;
-		/* if FP possible, set the SLUD bit in
-		 *  regLockFlags for ventura
-		 */
-		else if ((instance->is_ventura) && (!isRead) &&
-			(raid->writeMode == MR_RL_WRITE_BACK_MODE) &&
-			(raid->capability.fp_cache_bypass_capable))
-			((struct RAID_CONTEXT_G35 *) pRAID_Context)->routing_flags.bits.sld = 1;
-		/* set raid 1/10 fast path write capable bit in io_info */
-		if (io_info->fpOkForIo &&
-		    (io_info->r1_alt_dev_handle != MR_PD_INVALID) &&
-		    (raid->level == 1) && !isRead)
-			io_info->is_raid_1_fp_write = 1;
 		return retval;
 	} else if (isRead) {
 		uint stripIdx;

drivers/scsi/megaraid/megaraid_sas_fusion.h

@@ -673,6 +673,7 @@ struct MPI2_IOC_INIT_REQUEST {
 
 /* mrpriv defines */
 #define MR_PD_INVALID 0xFFFF
+#define MR_DEVHANDLE_INVALID 0xFFFF
 #define MAX_SPAN_DEPTH 8
 #define MAX_QUAD_DEPTH	MAX_SPAN_DEPTH
 #define MAX_RAIDMAP_SPAN_DEPTH (MAX_SPAN_DEPTH)
@@ -921,7 +922,6 @@ struct IO_REQUEST_INFO {
 	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;
 };
 
@@ -1060,7 +1060,6 @@ 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 */