netdev - [PATCH RFC v2 21/33] vhost_net: also populate XDP frame size

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Message-ID: <158634674102.707275.8538224465361298932.stgit@firesoul>
Date:   Wed, 08 Apr 2020 13:52:21 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     sameehj@...zon.com
Cc:     Jason Wang <jasowang@...hat.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        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>
Subject: [PATCH RFC v2 21/33] vhost_net: also populate XDP frame size

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 18e205eeb9af..5bf608766fc2 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -745,6 +745,7 @@ 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;