mlx4_en: UDP RSS support

Adding capability for RSS for UDP traffic, hashing is done based on
IP addresses and UDP port number.
The support depends on HW/FW capabilities.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 2a36a34..7338654 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -233,6 +233,7 @@
 	u32			bmme_flags;
 	u32			reserved_lkey;
 	u16			stat_rate_support;
+	int			udp_rss;
 	int			loopback_support;
 	u8			port_width_cap[MLX4_MAX_PORTS + 1];
 	int			max_gso_sz;