From patchwork Wed Nov 26 13:58:11 2008 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark McLoughlin X-Patchwork-Id: 10931 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by ozlabs.org (Postfix) with ESMTP id 0CAF5DDDFA for ; Thu, 27 Nov 2008 01:00:05 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752571AbYKZOAA (ORCPT ); Wed, 26 Nov 2008 09:00:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752389AbYKZOAA (ORCPT ); Wed, 26 Nov 2008 09:00:00 -0500 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 Received: from int-mx2.corp.redhat.com (int-mx2.corp.redhat.com [172.16.27.26]) by mx2.redhat.com (8.13.8/8.13.8) with ESMTP id mAQDxQVH004329; Wed, 26 Nov 2008 08:59:26 -0500 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx2.corp.redhat.com (8.13.1/8.13.1) with ESMTP id mAQDxPrT020292; Wed, 26 Nov 2008 08:59:26 -0500 Received: from [127.0.0.1] (sebastian-int.corp.redhat.com [172.16.52.221]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id mAQDxOE4004163; Wed, 26 Nov 2008 08:59:24 -0500 Subject: [PATCH] virtio_net: large tx MTU support From: Mark McLoughlin Reply-To: Mark McLoughlin To: Rusty Russell Cc: netdev , virtualization Date: Wed, 26 Nov 2008 13:58:11 +0000 Message-Id: <1227707891.9579.44.camel@blaa> Mime-Version: 1.0 X-Scanned-By: MIMEDefang 2.58 on 172.16.27.26 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 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;