[SRU][F:linux-bluefield][PATCH 06/21] tun: Add XDP frame size

[Bodong Wang]

From: Jesper Dangaard Brouer <brouer at redhat.com>

BugLink: https://bugs.launchpad.net/bugs/1934499

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.

Signed-off-by: Jesper Dangaard Brouer <brouer at redhat.com>
Signed-off-by: Alexei Starovoitov <ast at kernel.org>
Acked-by: Michael S. Tsirkin <mst at redhat.com>
Acked-by: Jason Wang <jasowang at redhat.com>
Link: https://lore.kernel.org/bpf/158945343419.97035.9594485183958037621.stgit@firesoul
(cherry picked from commit fb3e6e9307973d2f70a173f1b33d1054fa2b691f)
Signed-off-by: Maxim Mikityanskiy <maximmi at nvidia.com>
Reviewed-by: Moshe Shemesh <moshe at nvidia.com>
Signed-off-by: Bodong Wang <bodong at nvidia.com>
---
 drivers/net/tun.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 7c40ae0..87e5130 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1716,6 +1716,7 @@ 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) {
@@ -2466,6 +2467,7 @@ 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);
-- 
1.8.3.1