samples/bpf: Add missing option to xdp_sample_pkts usage

xdp_sample_pkts usage() is missing the introduction of the
"-S" option, this patch adds it.

Fixes: d50ecc46d18f ("samples/bpf: Attach XDP programs in driver mode by default")
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Link: https://lore.kernel.org/bpf/20210615135724.29528-1-wanghai38@huawei.com

diff --git a/samples/bpf/xdp_sample_pkts_user.c b/samples/bpf/xdp_sample_pkts_user.c
index 706475e004cb5100ea64596a6c6165cee4813664..495e09897bd3d5d8a8739bee05f5e38622bbdc0d 100644 (file)
--- a/samples/bpf/xdp_sample_pkts_user.c
+++ b/samples/bpf/xdp_sample_pkts_user.c
@@ -103,7 +103,8 @@ static void usage(const char *prog)
        fprintf(stderr,
                "%s: %s [OPTS] <ifname|ifindex>\n\n"
                "OPTS:\n"
-               "    -F    force loading prog\n",
+               "    -F    force loading prog\n"
+               "    -S    use skb-mode\n",
                __func__, prog);
 }