[dpdk-stable] [PATCH 17.11] net/virtio: init MTU in case no control channel

[patrick.fu at intel.com]

From: Patrick Fu <patrick.fu at intel.com>

[backport from commit id: 240da8b2143b7be372cf6388f028b26b15f16776]

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

Signed-off-by: Patrick Fu <patrick.fu at intel.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 e0328f6..c9076ea 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1508,6 +1508,8 @@ 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