From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark McLoughlin Subject: [PATCH] virtio_net: large tx MTU support Date: Wed, 26 Nov 2008 13:58:11 +0000 Message-ID: <1227707891.9579.44.camel@blaa> Reply-To: Mark McLoughlin Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: netdev , virtualization To: Rusty Russell Return-path: Received: from mx2.redhat.com ([66.187.237.31]:40504 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752308AbYKZN77 (ORCPT ); Wed, 26 Nov 2008 08:59:59 -0500 Sender: netdev-owner@vger.kernel.org List-ID: 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 --- drivers/net/virtio_net.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index e6b5d6e..71ca29c 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -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; -- 1.6.0.3