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Date: Wed, 6 May 2020 14:49:56 +0800 From: Jason Wang <jasowang@...hat.com> To: Jesper Dangaard Brouer <brouer@...hat.com>, sameehj@...zon.com Cc: netdev@...r.kernel.org, bpf@...r.kernel.org, zorik@...zon.com, akiyano@...zon.com, gtzalik@...zon.com, Toke Høiland-Jørgensen <toke@...hat.com>, Daniel Borkmann <borkmann@...earbox.net>, Alexei Starovoitov <alexei.starovoitov@...il.com>, John Fastabend <john.fastabend@...il.com>, Alexander Duyck <alexander.duyck@...il.com>, Jeff Kirsher <jeffrey.t.kirsher@...el.com>, David Ahern <dsahern@...il.com>, Willem de Bruijn <willemdebruijn.kernel@...il.com>, Ilias Apalodimas <ilias.apalodimas@...aro.org>, Lorenzo Bianconi <lorenzo@...nel.org>, Saeed Mahameed <saeedm@...lanox.com>, steffen.klassert@...unet.com Subject: Re: [PATCH net-next v2 20/33] vhost_net: also populate XDP frame size On 2020/5/6 下午2:41, Jason Wang wrote: > > On 2020/4/30 下午7:22, Jesper Dangaard Brouer wrote: >> In vhost_net_build_xdp() the 'buf' that gets queued via an xdp_buff >> have embedded a struct tun_xdp_hdr (located at xdp->data_hard_start) >> which contains the buffer length 'buflen' (with tailroom for >> skb_shared_info). Also storing this buflen in xdp->frame_sz, does not >> obsolete struct tun_xdp_hdr, as it also contains a struct >> virtio_net_hdr with other information. >> >> Cc: Jason Wang <jasowang@...hat.com> >> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com> >> --- >> drivers/vhost/net.c | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c >> index 2927f02cc7e1..516519dcc8ff 100644 >> --- a/drivers/vhost/net.c >> +++ b/drivers/vhost/net.c >> @@ -747,6 +747,7 @@ static int vhost_net_build_xdp(struct >> vhost_net_virtqueue *nvq, >> xdp->data = buf + pad; >> xdp->data_end = xdp->data + len; >> hdr->buflen = buflen; >> + xdp->frame_sz = buflen; >> --net->refcnt_bias; >> alloc_frag->offset += buflen; > > > Hi Jesper: > > As I said in v1, tun will do this for us (patch 19) via hdr->buflen. > So it looks to me this is not necessary? > > Thanks Miss your reply. So Acked-by: Jason Wang <jasowang@...hat.com>
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