Jason Wang <jasowang@xxxxxxxxxx> writes:
> Commit 55257d72bd1c51f25106350f4983ec19f62ed1fa (virtio-net: fill only rx
> queues which are being used) only does the napi enabling during open for
> curr_queue_pairs. This will break multiqueue receiving since napi of new queues
> were still disabled after changing the number of queues.
>
> This patch fixes this by enabling napi for all possible queues during open.
>
> Cc: Sasha Levin <sasha.levin@xxxxxxxxxx>
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Acked-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Dave, please send to Linus (fixes master).
Cheers,
Rusty.
> ---
> Changes from V1:
> - enable napi in open instead of virtnet_set_queues() to avoid kernel BUG() when
> trying to do napi_enable() for a already enabled queue
> ---
> drivers/net/virtio_net.c | 9 +++++----
> 1 files changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 2d6abac..241527d 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -636,10 +636,11 @@ static int virtnet_open(struct net_device *dev)
> struct virtnet_info *vi = netdev_priv(dev);
> int i;
>
> - for (i = 0; i < vi->curr_queue_pairs; i++) {
> - /* Make sure we have some buffers: if oom use wq. */
> - if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
> - schedule_delayed_work(&vi->refill, 0);
> + for (i = 0; i < vi->max_queue_pairs; i++) {
> + if (i < vi->curr_queue_pairs)
> + /* Make sure we have some buffers: if oom use wq. */
> + if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
> + schedule_delayed_work(&vi->refill, 0);
> virtnet_napi_enable(&vi->rq[i]);
> }
>
> --
> 1.7.1
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