samples/bpf: Add missing option to xdp_fwd usage

xdp_fwd usage() is missing the introduction of the "-S"
and "-F" options, 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/20210615135554.29158-1-wanghai38@huawei.com

diff --git a/samples/bpf/xdp_fwd_user.c b/samples/bpf/xdp_fwd_user.c
index 74a4583..0006126 100644 (file)
--- a/samples/bpf/xdp_fwd_user.c
+++ b/samples/bpf/xdp_fwd_user.c
@@ -67,6 +67,8 @@ static void usage(const char *prog)
                "usage: %s [OPTS] interface-list\n"
                "\nOPTS:\n"
                "    -d    detach program\n"
+               "    -S    use skb-mode\n"
+               "    -F    force loading prog\n"
                "    -D    direct table lookups (skip fib rules)\n",
                prog);
 }