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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

drivers/net/virtio_net.c

+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;