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-rw-r--r--drivers/scsi/megaraid/megaraid_sas.c31
-rw-r--r--drivers/scsi/megaraid/megaraid_sas.h4
2 files changed, 25 insertions, 10 deletions
diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 4014225300a..ffd1390b155 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -488,12 +488,13 @@ megasas_make_sgl64(struct megasas_instance *instance, struct scsi_cmnd *scp,
/**
* megasas_get_frame_count - Computes the number of frames
+ * @frame_type : type of frame- io or pthru frame
* @sge_count : number of sg elements
*
* Returns the number of frames required for numnber of sge's (sge_count)
*/
-static u32 megasas_get_frame_count(u8 sge_count)
+static u32 megasas_get_frame_count(u8 sge_count, u8 frame_type)
{
int num_cnt;
int sge_bytes;
@@ -504,13 +505,22 @@ static u32 megasas_get_frame_count(u8 sge_count)
sizeof(struct megasas_sge32);
/*
- * Main frame can contain 2 SGEs for 64-bit SGLs and
- * 3 SGEs for 32-bit SGLs
- */
- if (IS_DMA64)
- num_cnt = sge_count - 2;
- else
- num_cnt = sge_count - 3;
+ * Main frame can contain 2 SGEs for 64-bit SGLs and
+ * 3 SGEs for 32-bit SGLs for ldio &
+ * 1 SGEs for 64-bit SGLs and
+ * 2 SGEs for 32-bit SGLs for pthru frame
+ */
+ if (unlikely(frame_type == PTHRU_FRAME)) {
+ if (IS_DMA64)
+ num_cnt = sge_count - 1;
+ else
+ num_cnt = sge_count - 2;
+ } else {
+ if (IS_DMA64)
+ num_cnt = sge_count - 2;
+ else
+ num_cnt = sge_count - 3;
+ }
if(num_cnt>0){
sge_bytes = sge_sz * num_cnt;
@@ -592,7 +602,8 @@ megasas_build_dcdb(struct megasas_instance *instance, struct scsi_cmnd *scp,
* Compute the total number of frames this command consumes. FW uses
* this number to pull sufficient number of frames from host memory.
*/
- cmd->frame_count = megasas_get_frame_count(pthru->sge_count);
+ cmd->frame_count = megasas_get_frame_count(pthru->sge_count,
+ PTHRU_FRAME);
return cmd->frame_count;
}
@@ -709,7 +720,7 @@ megasas_build_ldio(struct megasas_instance *instance, struct scsi_cmnd *scp,
* Compute the total number of frames this command consumes. FW uses
* this number to pull sufficient number of frames from host memory.
*/
- cmd->frame_count = megasas_get_frame_count(ldio->sge_count);
+ cmd->frame_count = megasas_get_frame_count(ldio->sge_count, IO_FRAME);
return cmd->frame_count;
}
diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 6466bdf548c..fbbfe2ea049 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -542,6 +542,10 @@ struct megasas_ctrl_info {
#define MEGASAS_FW_BUSY 1
+/* Frame Type */
+#define IO_FRAME 0
+#define PTHRU_FRAME 1
+
/*
* When SCSI mid-layer calls driver's reset routine, driver waits for
* MEGASAS_RESET_WAIT_TIME seconds for all outstanding IO to complete. Note