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Commit 39da5814 authored by Mark McLoughlin's avatar Mark McLoughlin Committed by Rusty Russell
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virtio_net: large tx MTU support



We don't really have a max tx packet size limit, so allow configuring
the device with up to 64k tx MTU.

Signed-off-by: default avatarMark McLoughlin <markmc@redhat.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 6976a1d6
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+12 −0
Original line number Diff line number Diff line
@@ -613,6 +613,17 @@ static struct ethtool_ops virtnet_ethtool_ops = {
	.set_tso = ethtool_op_set_tso,
};

#define MIN_MTU 68
#define MAX_MTU 65535

static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
{
	if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
		return -EINVAL;
	dev->mtu = new_mtu;
	return 0;
}

static int virtnet_probe(struct virtio_device *vdev)
{
	int err;
@@ -628,6 +639,7 @@ static int virtnet_probe(struct virtio_device *vdev)
	dev->open = virtnet_open;
	dev->stop = virtnet_close;
	dev->hard_start_xmit = start_xmit;
	dev->change_mtu = virtnet_change_mtu;
	dev->features = NETIF_F_HIGHDMA;
#ifdef CONFIG_NET_POLL_CONTROLLER
	dev->poll_controller = virtnet_netpoll;