From f596cb198e65ff6839d35763d824399eb407adab Mon Sep 17 00:00:00 2001
From: Hyong Youb Kim <hyonkim@cisco.com>
Date: Wed, 10 Jan 2018 01:17:04 -0800
Subject: [PATCH] net/enic: fix L4 Rx ptype comparison

[ upstream commit 5dbff3af25a4a68980992f5040246e1d7f20b4cd ]

For non-UDP/TCP packets, enic may wrongly set PKT_RX_L4_CKSUM_BAD in
ol_flags. The comparison that checks if a packet is UDP or TCP assumes
that RTE_PTYPE_L4 values are bit flags, but they are not. For example,
the following evaluates to true because NONFRAG is 0x600 and UDP is
0x200, and causes the current code to think the packet is UDP.

!!(RTE_PTYPE_L4_NONFRAG & RTE_PTYPE_L4_UDP)

So, fix this by comparing the packet type against UDP and TCP
individually.

Fixes: 453d15059b58 ("net/enic: use new Rx checksum flags")

Signed-off-by: Hyong Youb Kim <hyonkim@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>
---
 drivers/net/enic/enic_rxtx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dpdk-17.11/drivers/net/enic/enic_rxtx.c b/dpdk-17.11/drivers/net/enic/enic_rxtx.c
index a3663d516..831c90a1c 100644
--- a/dpdk-17.11/drivers/net/enic/enic_rxtx.c
+++ b/dpdk-17.11/drivers/net/enic/enic_rxtx.c
@@ -285,7 +285,8 @@ enic_cq_rx_to_pkt_flags(struct cq_desc *cqd, struct rte_mbuf *mbuf)
 			else
 				pkt_flags |= PKT_RX_IP_CKSUM_BAD;
 
-			if (l4_flags & (RTE_PTYPE_L4_UDP | RTE_PTYPE_L4_TCP)) {
+			if (l4_flags == RTE_PTYPE_L4_UDP ||
+			    l4_flags == RTE_PTYPE_L4_TCP) {
 				if (enic_cq_rx_desc_tcp_udp_csum_ok(cqrd))
 					pkt_flags |= PKT_RX_L4_CKSUM_GOOD;
 				else
-- 
2.14.3

