[SCSI] bnx2fc: Tx BDs cache in write tasks

When there is a single BD for the entire data to be transmitted, use the BD
inside the SGL context and set the cached SGE indication in the task context

Signed-off-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 22 insertions, 7 deletions

diff --git a/drivers/scsi/bnx2fc/bnx2fc_hwi.c b/drivers/scsi/bnx2fc/bnx2fc_hwi.c
index 357a63d192e2..ec893594a127 100644
--- a/drivers/scsi/bnx2fc/bnx2fc_hwi.c
+++ b/drivers/scsi/bnx2fc/bnx2fc_hwi.c
@@ -1711,18 +1711,33 @@ void bnx2fc_init_task(struct bnx2fc_cmd *io_req,
                 task_type = FCOE_TASK_TYPE_READ;
 
         /* Tx only */
+        bd_count = bd_tbl->bd_valid;
         if (task_type == FCOE_TASK_TYPE_WRITE) {
-                task->txwr_only.sgl_ctx.sgl.mul_sgl.cur_sge_addr.lo =
-                                (u32)bd_tbl->bd_tbl_dma;
-                task->txwr_only.sgl_ctx.sgl.mul_sgl.cur_sge_addr.hi =
-                                (u32)((u64)bd_tbl->bd_tbl_dma >> 32);
-                task->txwr_only.sgl_ctx.sgl.mul_sgl.sgl_size =
-                                bd_tbl->bd_valid;
+                if ((dev_type == TYPE_DISK) && (bd_count == 1)) {
+                        struct fcoe_bd_ctx *fcoe_bd_tbl = bd_tbl->bd_tbl;
+
+                        task->txwr_only.sgl_ctx.cached_sge.cur_buf_addr.lo =
+                                        fcoe_bd_tbl->buf_addr_lo;
+                        task->txwr_only.sgl_ctx.cached_sge.cur_buf_addr.hi =
+                                        fcoe_bd_tbl->buf_addr_hi;
+                        task->txwr_only.sgl_ctx.cached_sge.cur_buf_rem =
+                                        fcoe_bd_tbl->buf_len;
+
+                        task->txwr_rxrd.const_ctx.init_flags |= 1 <<
+                                FCOE_TCE_TX_WR_RX_RD_CONST_CACHED_SGE_SHIFT;
+                } else {
+                        task->txwr_only.sgl_ctx.sgl.mul_sgl.cur_sge_addr.lo =
+                                        (u32)bd_tbl->bd_tbl_dma;
+                        task->txwr_only.sgl_ctx.sgl.mul_sgl.cur_sge_addr.hi =
+                                        (u32)((u64)bd_tbl->bd_tbl_dma >> 32);
+                        task->txwr_only.sgl_ctx.sgl.mul_sgl.sgl_size =
+                                        bd_tbl->bd_valid;
+                }
         }
 
         /*Tx Write Rx Read */
         /* Init state to NORMAL */
-        task->txwr_rxrd.const_ctx.init_flags = task_type <<
+        task->txwr_rxrd.const_ctx.init_flags |= task_type <<
                                 FCOE_TCE_TX_WR_RX_RD_CONST_TASK_TYPE_SHIFT;
         if (dev_type == TYPE_TAPE)
                 task->txwr_rxrd.const_ctx.init_flags |=