ENIC driver patch for PKT_RX_VLAN_PKT packet flag backward compatibility

The PKT_RX_VLAN_PKT flag will be totally obsolete by 16.11. We still need
this ENIC driver patch for 16.07.

Change-Id: I287035525d2d1b5313e88e9e74b6310536de2c32
Signed-off-by: John Lo <loj@cisco.com>

dpdk/dpdk-16.07_patches/0003-enic-Set-PKT_RX_VLAN_PKT-iff-returned-packet-has-VLA.patch

@@ -0,0 +1,42 @@
+From 6a7a9e52ed2ccfa86c2def3a66a368a5577f2fc2 Mon Sep 17 00:00:00 2001
+From: John Daley <johndale@cisco.com>
+Date: Tue, 3 May 2016 13:56:05 -0700
+Subject: [PATCH] enic: Set PKT_RX_VLAN_PKT iff returned packet has VLAN tag
+
+Only set the ol_flags PKT_RX_VLAN_PKT bit if the packet being passed
+to the application contains a VLAN tag. This is true whether
+stripping is enabled or disabled.
+
+This area of the API is in flux, so behaviour may change in the
+future.
+
+Signed-off-by: John Daley <johndale@cisco.com>
+---
+ drivers/net/enic/enic_rxtx.c | 7 +++++--
+ 1 file changed, 5 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/net/enic/enic_rxtx.c b/drivers/net/enic/enic_rxtx.c
+index 02b54dd..6a95389 100644
+--- a/drivers/net/enic/enic_rxtx.c
++++ b/drivers/net/enic/enic_rxtx.c
+@@ -195,12 +195,16 @@ enic_cq_rx_to_pkt_flags(struct cq_desc *cqd, struct rte_mbuf *mbuf)
+ 	if (unlikely(!enic_cq_rx_desc_eop(ciflags)))
+ 		goto mbuf_flags_done;
+ 
+-	/* VLAN stripping */
++	/* VLAN stripping. Set PKT_RX_VLAN_PKT only if there is a vlan tag
++	 * in the packet passed up
++	 */
+ 	if (bwflags & CQ_ENET_RQ_DESC_FLAGS_VLAN_STRIPPED) {
+-		pkt_flags |= PKT_RX_VLAN_PKT | PKT_RX_VLAN_STRIPPED;
++		pkt_flags |= PKT_RX_VLAN_STRIPPED;
+ 		mbuf->vlan_tci = enic_cq_rx_desc_vlan(cqrd);
+ 	} else {
+ 		mbuf->vlan_tci = 0;
++		if (enic_cq_rx_desc_vlan(cqrd))
++			pkt_flags |= PKT_RX_VLAN_PKT;
+ 	}
+ 
+ 	/* RSS flag */
+-- 
+