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

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Date:   Thu, 30 Apr 2020 13:21:58 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     sameehj@...zon.com
Cc:     Jason Wang <jasowang@...hat.com>, 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>,
        steffen.klassert@...unet.com
Subject: [PATCH net-next v2 19/33] tun: add XDP frame size

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@...hat.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
Acked-by: Jason Wang <jasowang@...hat.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);