From mboxrd@z Thu Jan  1 00:00:00 1970
From: wangzhike <wangzhike@jd.com>
Subject: [PATCH] net/virtio: init MTU in case no control channel
Date: Wed, 25 Oct 2017 20:09:06 -0700
Message-ID: <1508987346-68173-1-git-send-email-wangzhike@jd.com>
Mime-Version: 1.0
Content-Type: text/plain
Cc: <dev@dpdk.org>, wangzhike <wangzhike@jd.com>
To: <yliu@fridaylinux.org>, <maxime.coquelin@redhat.com>
Return-path: <dev-bounces@dpdk.org>
Received: from smtp.jd.com (smtp.jd.com [58.83.206.59])
 by dpdk.org (Postfix) with ESMTP id 9BD781BA22
 for <dev@dpdk.org>; Thu, 26 Oct 2017 05:09:33 +0200 (CEST)
List-Id: DPDK patches and discussions <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
Errors-To: dev-bounces@dpdk.org
Sender: "dev" <dev-bounces@dpdk.org>

The max_mtu is kept as zero in case no CRTL channel, which leads
to failure when calling virtio_mtu_set().

Signed-off-by: wangzhike <wangzhike@jd.com>
---
 drivers/net/virtio/virtio_ethdev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index bfbd737..823b3fd 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1474,6 +1474,8 @@ static int virtio_dev_xstats_get_names(struct rte_eth_dev *dev,
 	} else {
 		PMD_INIT_LOG(DEBUG, "config->max_virtqueue_pairs=1");
 		hw->max_queue_pairs = 1;
+		hw->max_mtu = VIRTIO_MAX_RX_PKTLEN - ETHER_HDR_LEN -
+			VLAN_TAG_LEN - hw->vtnet_hdr_size;
 	}
 
 	ret = virtio_alloc_queues(eth_dev);
-- 
1.8.3.1