net: mv643xx_eth: Use dma_map_single() to map the skb fragments

Using dma_map_single() instead of skb_frag_dma_map() allows to unmap
all the descriptors using dma_unmap_single(). This change allows
to introduce software TSO in a less intrusive way.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
index 01fde2c..8854751 100644 (file)
--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -732,8 +732,10 @@ static void txq_submit_frag_skb(struct tx_queue *txq, struct sk_buff *skb)
                skb_frag_t *this_frag;
                int tx_index;
                struct tx_desc *desc;
+               void *addr;
 
                this_frag = &skb_shinfo(skb)->frags[frag];
+               addr = page_address(this_frag->page.p) + this_frag->page_offset;
                tx_index = txq->tx_curr_desc++;
                if (txq->tx_curr_desc == txq->tx_ring_size)
                        txq->tx_curr_desc = 0;
@@ -753,10 +755,8 @@ static void txq_submit_frag_skb(struct tx_queue *txq, struct sk_buff *skb)
 
                desc->l4i_chk = 0;
                desc->byte_cnt = skb_frag_size(this_frag);
-               desc->buf_ptr = skb_frag_dma_map(mp->dev->dev.parent,
-                                                this_frag, 0,
-                                                skb_frag_size(this_frag),
-                                                DMA_TO_DEVICE);
+               desc->buf_ptr = dma_map_single(mp->dev->dev.parent, addr,
+                                              desc->byte_cnt, DMA_TO_DEVICE);
        }
 }
 
@@ -927,14 +927,8 @@ static int txq_reclaim(struct tx_queue *txq, int budget, int force)
                        mp->dev->stats.tx_errors++;
                }
 
-               if (cmd_sts & TX_FIRST_DESC) {
-                       dma_unmap_single(mp->dev->dev.parent, desc->buf_ptr,
-                                        desc->byte_cnt, DMA_TO_DEVICE);
-               } else {
-                       dma_unmap_page(mp->dev->dev.parent, desc->buf_ptr,
-                                      desc->byte_cnt, DMA_TO_DEVICE);
-               }
-
+               dma_unmap_single(mp->dev->dev.parent, desc->buf_ptr,
+                                desc->byte_cnt, DMA_TO_DEVICE);
                dev_kfree_skb(skb);
        }