IB/srpt: Introduce target_reverse_dma_direction()

Use the function target_reverse_dma_direction() instead of
reimplementing it.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Cc: Alex Estrin <alex.estrin@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 6d1a137..5da59f4 100644 (file)
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -96,19 +96,6 @@ static int srpt_queue_status(struct se_cmd *cmd);
 static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc);
 static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc);
 
-/**
- * opposite_dma_dir() - Swap DMA_TO_DEVICE and DMA_FROM_DEVICE.
- */
-static inline
-enum dma_data_direction opposite_dma_dir(enum dma_data_direction dir)
-{
-       switch (dir) {
-       case DMA_TO_DEVICE:     return DMA_FROM_DEVICE;
-       case DMA_FROM_DEVICE:   return DMA_TO_DEVICE;
-       default:                return dir;
-       }
-}
-
 static enum rdma_ch_state
 srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new_state)
 {
@@ -1049,7 +1036,7 @@ static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch,
                dir = ioctx->cmd.data_direction;
                BUG_ON(dir == DMA_NONE);
                ib_dma_unmap_sg(ch->sport->sdev->device, sg, ioctx->sg_cnt,
-                               opposite_dma_dir(dir));
+                               target_reverse_dma_direction(&ioctx->cmd));
                ioctx->mapped_sg_count = 0;
        }
 }
@@ -1086,7 +1073,7 @@ static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
        ioctx->sg_cnt = sg_cnt = cmd->t_data_nents;
 
        count = ib_dma_map_sg(ch->sport->sdev->device, sg, sg_cnt,
-                             opposite_dma_dir(dir));
+                             target_reverse_dma_direction(cmd));
        if (unlikely(!count))
                return -EAGAIN;