Re: [PATCH net V2] virtio-net: re enable XDP_REDIRECT for mergeable buffer

From: Jason Wang
Date: Sun Mar 04 2018 - 21:41:50 EST




On 2018å03æ03æ 01:36, Michael S. Tsirkin wrote:
On Fri, Mar 02, 2018 at 05:29:14PM +0800, Jason Wang wrote:
XDP_REDIRECT support for mergeable buffer was removed since commit
7324f5399b06 ("virtio_net: disable XDP_REDIRECT in receive_mergeable()
case"). This is because we don't reserve enough tailroom for struct
skb_shared_info which breaks XDP assumption. So this patch fixes this
by reserving enough tailroom and using fixed size of rx buffer.

Signed-off-by: Jason Wang<jasowang@xxxxxxxxxx>
Acked-by: Michael S. Tsirkin<mst@xxxxxxxxxx>

I think the next incremental step is to look at splitting
out fast path XDP processing to a separate set of functions.


Let me try (probably after 1.1 stuffs).

Thanks