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[net-next,v4,20/33] vhost_net: also populate XDP frame size

Message ID 158945343928.97035.4620233649151726289.stgit@firesoul
State Superseded
Headers show
Series XDP extend with knowledge of frame size | expand

Commit Message

Jesper Dangaard Brouer May 14, 2020, 10:50 a.m. UTC
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@redhat.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
 drivers/vhost/net.c |    1 +
 1 file changed, 1 insertion(+)
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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;
 	alloc_frag->offset += buflen;