From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: Aaron Conole <aconole@redhat.com>,
netdev@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC -next 2/2] virtio_net: Read and use the advised MTU
Date: Thu, 10 Mar 2016 21:56:50 +0300 [thread overview]
Message-ID: <56E1C372.60204@cogentembedded.com> (raw)
In-Reply-To: <1457620092-24170-3-git-send-email-aconole@redhat.com>
Hello.
On 03/10/2016 05:28 PM, Aaron Conole wrote:
> This patch checks the feature bit for the VIRTIO_NET_F_MTU feature. If it
> exists, read the advised MTU and use it.
>
> No proper error handling is provided for the case where a user changes the
> negotiated MTU. A future commit will add proper error handling. Instead, a
> warning is emitted if the guest changes the device MTU after previously being
> given advice.
>
> Signed-off-by: Aaron Conole <aconole@redhat.com>
> ---
> drivers/net/virtio_net.c | 15 ++++++++++++++-
> 1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 767ab11..7175563 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
[...]
> @@ -1390,8 +1391,12 @@ static const struct ethtool_ops virtnet_ethtool_ops = {
>
> static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
> {
> + struct virtnet_info *vi = netdev_priv(dev);
> if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
> return -EINVAL;
> + if (vi->negotiated_mtu == true) {
> + pr_warn("changing mtu from negotiated mtu.");
> + }
{} not needed, see Documentation/CodingStyle.
[...]
MBR, Sergei
next prev parent reply other threads:[~2016-03-10 18:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-10 14:28 [RFC -next 0/2] virtio-net: Advised MTU feature Aaron Conole
2016-03-10 14:28 ` [RFC -next 1/2] virtio: Start the advised MTU feature support Aaron Conole
2016-03-10 14:28 ` [RFC -next 2/2] virtio_net: Read and use the advised MTU Aaron Conole
2016-03-10 14:57 ` Paolo Abeni
2016-03-15 20:52 ` Aaron Conole
2016-03-10 18:56 ` Sergei Shtylyov [this message]
2016-03-15 20:53 ` Aaron Conole
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