[SCSI] bnx2fc: Tx BDs cache in write tasks
Bhanu Prakash Gollapudi [Wed, 27 Jul 2011 18:32:12 +0000 (11:32 -0700)]
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>

drivers/scsi/bnx2fc/bnx2fc_hwi.c

index 357a63d..ec89359 100644 (file)
@@ -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 |=