stmmac: convert to SKB paged frag API.

Signed-off-by: NIan Campbell <ian.campbell@citrix.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: netdev@vger.kernel.org
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -1113,9 +1113,8 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 		desc = priv->dma_tx + entry;
 
 		TX_DBG("\t[entry %d] segment len: %d\n", entry, len);
-		desc->des2 = dma_map_page(priv->device, frag->page,
-					  frag->page_offset,
-					  len, DMA_TO_DEVICE);
+		desc->des2 = skb_frag_dma_map(priv->device, frag, 0, len,
+					      DMA_TO_DEVICE);
 		priv->tx_skbuff[entry] = NULL;
 		priv->hw->desc->prepare_tx_desc(desc, 0, len, csum_insertion);
 		wmb();