netdev - [PATCH v4 bpf-next 15/15] samples/bpf: add XDP egress support to xdp1

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Message-Id: <20200427224633.15627-16-dsahern@kernel.org>
Date:   Mon, 27 Apr 2020 16:46:33 -0600
From:   David Ahern <dsahern@...nel.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org,
        prashantbhole.linux@...il.com, jasowang@...hat.com,
        brouer@...hat.com, toke@...hat.com, toshiaki.makita1@...il.com,
        daniel@...earbox.net, john.fastabend@...il.com, ast@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com, andriin@...com,
        dsahern@...il.com, David Ahern <dahern@...italocean.com>
Subject: [PATCH v4 bpf-next 15/15] samples/bpf: add XDP egress support to xdp1

From: David Ahern <dahern@...italocean.com>

xdp1 and xdp2 now accept -E flag to set XDP program in the egress
path.

Signed-off-by: Prashant Bhole <prashantbhole.linux@...il.com>
Signed-off-by: David Ahern <dahern@...italocean.com>
---
 samples/bpf/xdp1_user.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/samples/bpf/xdp1_user.c b/samples/bpf/xdp1_user.c
index c447ad9e3a1d..bb104f4d8c5e 100644
--- a/samples/bpf/xdp1_user.c
+++ b/samples/bpf/xdp1_user.c
@@ -73,7 +73,8 @@ 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"
+		"    -E	   egress path program\n",
 		prog);
 }
 
@@ -85,7 +86,7 @@ int main(int argc, char **argv)
 	};
 	struct bpf_prog_info info = {};
 	__u32 info_len = sizeof(info);
-	const char *optstr = "FSN";
+	const char *optstr = "FSNE";
 	int prog_fd, map_fd, opt;
 	struct bpf_object *obj;
 	struct bpf_map *map;
@@ -103,13 +104,17 @@ int main(int argc, char **argv)
 		case 'F':
 			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
 			break;
+		case 'E':
+			xdp_flags |= XDP_FLAGS_EGRESS_MODE;
+			prog_load_attr.expected_attach_type = BPF_XDP_EGRESS;
+			break;
 		default:
 			usage(basename(argv[0]));
 			return 1;
 		}
 	}
 
-	if (!(xdp_flags & XDP_FLAGS_SKB_MODE))
+	if (!(xdp_flags & (XDP_FLAGS_SKB_MODE | XDP_FLAGS_EGRESS_MODE)))
 		xdp_flags |= XDP_FLAGS_DRV_MODE;
 
 	if (optind == argc) {
-- 
2.21.1 (Apple Git-122.3)