[PATCH net-next v2 19/33] tun: add XDP frame size

Jesper Dangaard Brouer
2020-04-30T11:22:11Z

The tun driver have two code paths for running XDP (bpf_prog_run_xdp).
In both cases 'buflen' contains enough tailroom for skb_shared_info.

Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
---
drivers/net/tun.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 44889eba1dbc..c54f967e2c66 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1671,6 +1671,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
xdp_set_data_meta_invalid(&xdp);
xdp.data_end = xdp.data + len;
xdp.rxq = &tfile->xdp_rxq;
+ xdp.frame_sz = buflen;

act = bpf_prog_run_xdp(xdp_prog, &xdp);
if (act == XDP_REDIRECT || act == XDP_TX) {
@@ -2411,6 +2412,7 @@ static int tun_xdp_one(struct tun_struct *tun,
}
xdp_set_data_meta_invalid(xdp);
xdp->rxq = &tfile->xdp_rxq;
+ xdp->frame_sz = buflen;

act = bpf_prog_run_xdp(xdp_prog, xdp);
err = tun_xdp_act(tun, xdp_prog, xdp, act);