linux-kernel - Re: [PATCH net] virtio-net: re enable XDP

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Date:   Fri, 2 Mar 2018 08:05:17 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        john.fastabend@...il.com, brouer@...hat.com
Subject: Re: [PATCH net] virtio-net: re enable XDP_REDIRECT for mergeable
 buffer

On Fri,  2 Mar 2018 14:25:29 +0800
Jason Wang <jasowang@...hat.com> wrote:

> @@ -770,6 +774,19 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
>  				goto err_xdp;
>  			rcu_read_unlock();
>  			goto xdp_xmit;
> +		case XDP_REDIRECT:
> +			err = xdp_do_redirect(dev, &xdp, xdp_prog);
> +			if (err) {
> +				trace_xdp_exception(vi->dev, xdp_prog, act);

Do not add a trace_xdp_exception here... this is handled inside
xdp_do_redirect() invocation.

> +				if (unlikely(xdp_page != page))
> +					put_page(xdp_page);
> +				goto err_xdp;
> +			}
> +			*xdp_xmit = true;
> +			if (unlikely(xdp_page != page))
> +				goto err_xdp;
> +			rcu_read_unlock();
> +			goto xdp_xmit;



-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer