netdev - Re: [PATCH net, stable v1 3/3] virtio_net: add checking sq is full inside xdp xmit

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Date:   Wed, 8 Mar 2023 13:20:50 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc:     netdev@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        virtualization@...ts.linux-foundation.org, bpf@...r.kernel.org,
        Yichun Zhang <yichun@...nresty.com>,
        Alexander Duyck <alexanderduyck@...com>
Subject: Re: [PATCH net, stable v1 3/3] virtio_net: add checking sq is full
 inside xdp xmit

On Wed, Mar 8, 2023 at 10:49 AM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> wrote:
>
> If the queue of xdp xmit is not an independent queue, then when the xdp
> xmit used all the desc, the xmit from the __dev_queue_xmit() may encounter
> the following error.
>
> net ens4: Unexpected TXQ (0) queue failure: -28
>
> This patch adds a check whether sq is full in xdp xmit.
>
> Fixes: 56434a01b12e ("virtio_net: add XDP_TX support")
> Reported-by: Yichun Zhang <yichun@...nresty.com>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> Reviewed-by: Alexander Duyck <alexanderduyck@...com>
> Acked-by: Michael S. Tsirkin <mst@...hat.com>

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

Thanks

> ---
>  drivers/net/virtio_net.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 46bbddaadb0d..1a309cfb4976 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -767,6 +767,9 @@ static int virtnet_xdp_xmit(struct net_device *dev,
>         }
>         ret = nxmit;
>
> +       if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq))
> +               check_sq_full_and_disable(vi, dev, sq);
> +
>         if (flags & XDP_XMIT_FLUSH) {
>                 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
>                         kicks = 1;
> --
> 2.32.0.3.g01195cf9f
>