[PATCH net] veth: xdp: use head instead of hard_start

Mao Wenan
2020-03-30T10:24:01Z

xdp.data_hard_start is mapped to the first
address of xdp_frame, but the pointer hard_start
is the offset(sizeof(struct xdp_frame)) of xdp_frame,
it should use head instead of hard_start to
set xdp.data_hard_start. Otherwise, if BPF program
calls helper_function such as bpf_xdp_adjust_head, it
will be confused for xdp_frame_end.

Signed-off-by: Mao Wenan <maowenan@huawei.com>
---
drivers/net/veth.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index d4cbb9e8c63f..5ea550884bf8 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -506,7 +506,7 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq,
struct xdp_buff xdp;
u32 act;

- xdp.data_hard_start = hard_start;
+ xdp.data_hard_start = head;
xdp.data = frame->data;
xdp.data_end = frame->data + frame->len;
xdp.data_meta = frame->data - frame->metasize;
--
2.20.1