Subject: virtio_net: large tx MTU support Date: Wed, 26 Nov 2008 13:58:11 +0000 From: Mark McLoughlin 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: Mark McLoughlin Signed-off-by: Rusty Russell --- drivers/net/virtio_net.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -480,6 +480,17 @@ static struct ethtool_ops virtnet_ethtoo .set_sg = ethtool_op_set_sg, }; +#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; @@ -495,6 +506,7 @@ static int virtnet_probe(struct virtio_d 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;