netdev - [RFC net-next 04/14] samples/bpf: xdp1, add XDP tx support

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Date:   Wed, 18 Dec 2019 17:10:40 +0900
From:   Prashant Bhole <prashantbhole.linux@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>
Cc:     Prashant Bhole <prashantbhole.linux@...il.com>,
        Jason Wang <jasowang@...hat.com>,
        David Ahern <dsahern@...il.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        John Fastabend <john.fastabend@...il.com>,
        Toshiaki Makita <toshiaki.makita1@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>, netdev@...r.kernel.org
Subject: [RFC net-next 04/14] samples/bpf: xdp1, add XDP tx support

xdp1 and xdp2 now accept -T flag to set XDP program in the tx path.

Signed-off-by: Prashant Bhole <prashantbhole.linux@...il.com>
---
 samples/bpf/xdp1_user.c | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/samples/bpf/xdp1_user.c b/samples/bpf/xdp1_user.c
index 3e553eed95a7..16408f5afa4d 100644
--- a/samples/bpf/xdp1_user.c
+++ b/samples/bpf/xdp1_user.c
@@ -21,17 +21,26 @@
 static int ifindex;
 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
 static __u32 prog_id;
+static bool tx_path;
 
 static void int_exit(int sig)
 {
 	__u32 curr_prog_id = 0;
+	int err;
 
-	if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
+	if (tx_path)
+		err = bpf_get_link_xdp_tx_id(ifindex, &curr_prog_id, xdp_flags);
+	else
+		err = bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags);
+	if (err) {
 		printf("bpf_get_link_xdp_id failed\n");
 		exit(1);
 	}
 	if (prog_id == curr_prog_id)
-		bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
+		if (tx_path)
+			bpf_set_link_xdp_tx_fd(ifindex, -1, xdp_flags);
+		else
+			bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
 	else if (!curr_prog_id)
 		printf("couldn't find a prog id on a given interface\n");
 	else
@@ -73,7 +82,8 @@ static void usage(const char *prog)
 		"OPTS:\n"
 		"    -S    use skb-mode\n"
 		"    -N    enforce native mode\n"
-		"    -F    force loading prog\n",
+		"    -F    force loading prog\n"
+		"    -T    TX path prog\n",
 		prog);
 }
 
@@ -85,7 +95,7 @@ int main(int argc, char **argv)
 	};
 	struct bpf_prog_info info = {};
 	__u32 info_len = sizeof(info);
-	const char *optstr = "FSN";
+	const char *optstr = "FSNT";
 	int prog_fd, map_fd, opt;
 	struct bpf_object *obj;
 	struct bpf_map *map;
@@ -103,6 +113,9 @@ int main(int argc, char **argv)
 		case 'F':
 			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
 			break;
+		case 'T':
+			tx_path = true;
+			break;
 		default:
 			usage(basename(argv[0]));
 			return 1;
@@ -146,7 +159,12 @@ int main(int argc, char **argv)
 	signal(SIGINT, int_exit);
 	signal(SIGTERM, int_exit);
 
-	if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
+	if (tx_path)
+		err = bpf_set_link_xdp_tx_fd(ifindex, prog_fd, xdp_flags);
+	else
+		err = bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags);
+
+	if (err < 0) {
 		printf("link set xdp fd failed\n");
 		return 1;
 	}
-- 
2.21.0