From 511a6dacda5cf45c9194a4fe895de6fe40e7b06a Mon Sep 17 00:00:00 2001
From: Ido Barnea <ibarnea@cisco.com>
Date: Wed, 14 Dec 2016 13:29:49 +0200
Subject: [PATCH] Fix E1000 stateful latency. Was broken in
 227c1ff45fe36be859e9145cb1ec8c364a7fb8b7

Signed-off-by: Ido Barnea <ibarnea@cisco.com>
---
 src/stateful_rx_core.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/stateful_rx_core.cpp b/src/stateful_rx_core.cpp
index 65d0a17d..cd2263a4 100644
--- a/src/stateful_rx_core.cpp
+++ b/src/stateful_rx_core.cpp
@@ -461,8 +461,11 @@ bool CCPortLatency::check_packet(rte_mbuf_t * m,CRx_check_header * & rx_p) {
     }
 
     if ( (pkt_size-vlan_offset) != m_pkt_size ) {
-        m_length_error++;
-        return (false);
+        // patch for e1000 card. e1000 hands us the packet with Ethernet FCS, so it is 4 bytes longer
+        if ((pkt_size - vlan_offset - 4) != m_pkt_size ) {
+            m_length_error++;
+            return (false);
+        }
     }
     c_l_pkt_mode->update_recv(p + m_l4_offset + vlan_offset, &m_icmp_rx_seq, &m_icmp_tx_seq);
 #ifdef LATENCY_DEBUG
-- 
2.16.6