[dpdk-dev] [PATCH v2 2/3] Signed-off-by: Souvik Dey <sodey at sonusnet.com>

[souvikdey33]

Fixes: 1fb8e8896ca8 ("Signed-off-by: Souvik Dey <sodey at sonusnet.com>")
Reviewed-by: Stephen Hemminger <stephen at networkplumber.org>

Virtio interfaces should also support setting of mtu, as in case of cloud
it is expected to have the consistent mtu across the infrastructure that
the dhcp server sends and not hardcoded to 1500(default).
---
 drivers/net/virtio/virtio_ethdev.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 07d6449..da16ad4 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -92,6 +92,7 @@ static void virtio_mac_addr_add(struct rte_eth_dev *dev,
 static void virtio_mac_addr_remove(struct rte_eth_dev *dev, uint32_t index);
 static void virtio_mac_addr_set(struct rte_eth_dev *dev,
 				struct ether_addr *mac_addr);
+static int  virtio_mtu_set(struct rte_eth_dev *dev, uint16_t mtu);
 
 static int virtio_dev_queue_stats_mapping_set(
 	__rte_unused struct rte_eth_dev *eth_dev,
@@ -652,6 +653,16 @@ virtio_dev_allmulticast_disable(struct rte_eth_dev *dev)
 		PMD_INIT_LOG(ERR, "Failed to disable allmulticast");
 }
 
+static int 
+virtio_mtu_set(struct rte_eth_dev *dev, uint16_t mtu) 
+{
+   struct virtio_hw *hw = dev->data->dev_private;
+   if (mtu < VIRTIO_MIN_RX_BUFSIZE || mtu > VIRTIO_MAX_RX_PKTLEN) {
+	   PMD_INIT_LOG(ERR,"Mtu should be between 64 and 9728."
+          return -EINVAL;
+   }
+   return 0;
+}
+
 /*
  * dev_ops for virtio, bare necessities for basic operation
  */
@@ -664,6 +675,7 @@ static const struct eth_dev_ops virtio_eth_dev_ops = {
 	.promiscuous_disable     = virtio_dev_promiscuous_disable,
 	.allmulticast_enable     = virtio_dev_allmulticast_enable,
 	.allmulticast_disable    = virtio_dev_allmulticast_disable,
+	.mtu_set                 = virtio_mtu_set,
 
 	.dev_infos_get           = virtio_dev_info_get,
 	.stats_get               = virtio_dev_stats_get,
-- 
2.9.3.windows.1