Re: [PATCH bpf-next] net: veth: account total xdp_frame len running ndo_xdp_xmit

Introduce xdp_get_frame_len utility routine to get the xdp_frame full
length and account total frame size running XDP_REDIRECT of a
non-linear xdp frame into a veth device.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 drivers/net/veth.c |  4 ++--
 include/net/xdp.h  | 14 ++++++++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 354a963075c5..22ecaf8b8f98 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c

@@ -493,7 +493,7 @@ static int veth_xdp_xmit(struct net_device *dev, int n,
                struct xdp_frame *frame = frames[i];
                void *ptr = veth_xdp_to_ptr(frame);

-               if (unlikely(frame->len > max_len ||
+               if (unlikely(xdp_get_frame_len(frame) > max_len ||
                             __ptr_ring_produce(&rq->xdp_ring, ptr)))
                        break;