cxgb4: set skb->rxhash

Implement the ->set_flags ethtool method to control NETIF_F_RXHASH and
set skb->rxhash to the HW calculated hash accordingly.

Follow Eric Dumazet's suggestion and use the hash value raw.

Signed-off-by: Dimitris Michailidis <dm@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/cxgb4/t4_msg.h b/drivers/net/cxgb4/t4_msg.h
index fdb1174..7a981b8 100644
--- a/drivers/net/cxgb4/t4_msg.h
+++ b/drivers/net/cxgb4/t4_msg.h
@@ -503,6 +503,7 @@
 };
 
 struct cpl_rx_pkt {
+	struct rss_header rsshdr;
 	u8 opcode;
 #if defined(__LITTLE_ENDIAN_BITFIELD)
 	u8 iff:4;