netdev - Re: [PATCH] virtio_net: zero is an invald queue

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Message-ID: <5354BB94.4030908@redhat.com>
Date:	Mon, 21 Apr 2014 14:32:52 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Amos Kong <akong@...hat.com>,
	virtualization@...ts.linux-foundation.org
CC:	netdev@...r.kernel.org, mst@...hat.com
Subject: Re: [PATCH] virtio_net: zero is an invald queue_pairs number

On 04/18/2014 01:45 PM, Amos Kong wrote:
> Execute "ethtool -L eth0 combined 0" in guest, if multiqueue
> is enabled, virtnet_send_command() will return -EINVAL error,
> there is a validation in QEMU.
>
> But if multiqueue is disabled, virtnet_set_queues() will just
> return zero (success). We should return error for this situation.
>
> Signed-off-by: Amos Kong <akong@...hat.com>
> ---
>  drivers/net/virtio_net.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 7b68746..8a852b5 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1285,7 +1285,7 @@ static int virtnet_set_channels(struct net_device *dev,
>  	if (channels->rx_count || channels->tx_count || channels->other_count)
>  		return -EINVAL;
>  
> -	if (queue_pairs > vi->max_queue_pairs)
> +	if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
>  		return -EINVAL;
>  
>  	get_online_cpus();

Acked-by:  Jason Wang <jasowang@...hat.com>
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