net/mlx4_en: Doorbell is byteswapped in Little Endian archs

iowrite32() will byteswap it's argument on big endian archs.
iowrite32be() will byteswap on little endian archs.
Since we don't want to do this unnecessary byteswap on the fast path,
doorbell is stored in the NIC's native endianness. Using the right
iowrite() according to the arch endianness.

CC: Wei Yang <weiyang@linux.vnet.ibm.com>
CC: David Laight <david.laight@aculab.com>
Fixes: 6a4e812 ("net/mlx4_en: Avoid calling bswap in tx fast path")
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index a308d41e4de08678107b185df2c7b8b7df3b39a7..e3357bf523df866222bdabdd0ec4c31cb24bb2a7 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -962,7 +962,17 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
                tx_desc->ctrl.owner_opcode = op_own;
                if (send_doorbell) {
                        wmb();
-                       iowrite32(ring->doorbell_qpn,
+                       /* Since there is no iowrite*_native() that writes the
+                        * value as is, without byteswapping - using the one
+                        * the doesn't do byteswapping in the relevant arch
+                        * endianness.
+                        */
+#if defined(__LITTLE_ENDIAN)
+                       iowrite32(
+#else
+                       iowrite32be(
+#endif
+                                 ring->doorbell_qpn,
                                  ring->bf.uar->map + MLX4_SEND_DOORBELL);
                } else {
                        ring->xmit_more++;