netdev - Re: "virtio-net: enable multiqueue by default" in linux-next breaks networking on GCE

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Date:   Mon, 12 Dec 2016 23:19:48 -0500
From:   Theodore Ts'o <tytso@....edu>
To:     Jason Wang <jasowang@...hat.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org,
        nhorman@...driver.com, davem@...emloft.net
Subject: Re: "virtio-net: enable multiqueue by default" in linux-next breaks
 networking on GCE

On Tue, Dec 13, 2016 at 11:43:00AM +0800, Jason Wang wrote:
> Thanks for reporting this issue. Looks like I blindly set the affinity
> instead of queues during probe. Could you please try the following patch to
> see if it works?

This fixed things, thanks!!

						- Ted
						

> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index b425fa1..fe9f772 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1930,7 +1930,9 @@ static int virtnet_probe(struct virtio_device *vdev)
>                 goto free_unregister_netdev;
>         }
> 
> -       virtnet_set_affinity(vi);
> +       rtnl_lock();
> +       virtnet_set_queues(vi, vi->curr_queue_pairs);
> +       rtnl_unlock();
> 
>         /* Assume link up if device can't report link status,
>            otherwise get link status from config. */
> 
>