virtio_net: BQL?

From: Dave Taht <dave.taht@gmail.com>
To: Xianting Tian <xianting.tian@linux.alibaba.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
	Jason Wang <jasowang@redhat.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	virtualization@lists.linux-foundation.org,
	Linux Kernel Network Developers <netdev@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: virtio_net: BQL?
Date: Mon, 17 May 2021 11:43:43 -0700	[thread overview]
Message-ID: <CAA93jw6LUAnWZj0b5FvefpDKUyd6cajCNLoJ6OKrwbu-V_ffrA@mail.gmail.com> (raw)
In-Reply-To: <56270996-33a6-d71b-d935-452dad121df7@linux.alibaba.com>

Not really related to this patch, but is there some reason why virtio
has no support for BQL?

On Mon, May 17, 2021 at 11:41 AM Xianting Tian
<xianting.tian@linux.alibaba.com> wrote:
>
> BUG_ON() uses unlikely in if(), which can be optimized at compile time.
>
> Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
> ---
>   drivers/net/virtio_net.c | 5 ++---
>   1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index c921ebf3ae82..212d52204884 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1646,10 +1646,9 @@ static int xmit_skb(struct send_queue *sq, struct
> sk_buff *skb)
>         else
>                 hdr = skb_vnet_hdr(skb);
>
> -       if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
> +       BUG_ON(virtio_net_hdr_from_skb(skb, &hdr->hdr,
>                                     virtio_is_little_endian(vi->vdev), false,
> -                                   0))
> -               BUG();
> +                                   0));
>
>         if (vi->mergeable_rx_bufs)
>                 hdr->num_buffers = 0;
> --
> 2.17.1
>

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