net/virtio: set MTU

[dpdk.git] / drivers / net / virtio / virtio_ethdev.c

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index b4dfc0a..39bb5f7 100644 (file)
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -652,6 +652,23 @@ virtio_dev_allmulticast_disable(struct rte_eth_dev *dev)
                PMD_INIT_LOG(ERR, "Failed to disable allmulticast");
 }
 
+#define VLAN_TAG_LEN           4    /* 802.3ac tag (not DMA'd) */
+static int
+virtio_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
+{
+       struct virtio_hw *hw = dev->data->dev_private;
+       uint32_t ether_hdr_len = ETHER_HDR_LEN + VLAN_TAG_LEN +
+                                hw->vtnet_hdr_size;
+       uint32_t frame_size = mtu + ether_hdr_len;
+
+       if (mtu < ETHER_MIN_MTU || frame_size > VIRTIO_MAX_RX_PKTLEN) {
+               PMD_INIT_LOG(ERR, "MTU should be between %d and %d\n",
+                       ETHER_MIN_MTU, VIRTIO_MAX_RX_PKTLEN - ether_hdr_len);
+               return -EINVAL;
+       }
+       return 0;
+}
+
 /*
  * dev_ops for virtio, bare necessities for basic operation
  */
@@ -664,7 +681,7 @@ 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,
        .xstats_get              = virtio_dev_xstats_get,