[PATCH] examples/vhost: Fix vlan offload issue

[Ouyang Changchun <changchun.ouyang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

The following commit break vm2vm hard mode test cases:
commit db4014f2b65cb31bf209cadd5bcec778ca137fe2
Author: Huawei Xie <huawei.xie-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Date:   Thu Nov 13 06:34:07 2014 +0800
    examples/vhost: use factorized default Rx/Tx configuration

Investigation show that it needs enabling vlan offload since it is turn off by default,
and Tx need it, especially when vm2vm is in hard mode.

Signed-off-by: Changchun Ouyang <changchun.ouyang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
 examples/vhost/main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index 9331910..04f0118 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -390,6 +390,9 @@ port_init(uint8_t port)
 	txconf = &dev_info.default_txconf;
 	rxconf->rx_drop_en = 1;
 
+	/* Enable vlan offload */
+	txconf->txq_flags &= ~ETH_TXQ_FLAGS_NOVLANOFFL;
+
 	/*
 	 * Zero copy defers queue RX/TX start to the time when guest
 	 * finishes its startup and packet buffers from that guest are
-- 
1.8.4.2