1 files changed, 145 insertions, 0 deletions
diff --git a/samples/bpf/xdp_redirect_map_user.c b/samples/bpf/xdp_redirect_map_user.c
new file mode 100644
index 000000000000..d4d86a273fba
--- /dev/null
+++ b/samples/bpf/xdp_redirect_map_user.c
@@ -0,0 +1,145 @@
+/* Copyright (c) 2017 Covalent IO, Inc. http://covalent.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/bpf.h>
+#include <linux/if_link.h>
+#include <assert.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <unistd.h>
+#include <libgen.h>
+
+#include "bpf_load.h"
+#include "bpf_util.h"
+#include "libbpf.h"
+
+static int ifindex_in;
+static int ifindex_out;
+static bool ifindex_out_xdp_dummy_attached = true;
+
+static __u32 xdp_flags;
+
+static void int_exit(int sig)
+{
+	set_link_xdp_fd(ifindex_in, -1, xdp_flags);
+	if (ifindex_out_xdp_dummy_attached)
+		set_link_xdp_fd(ifindex_out, -1, xdp_flags);
+	exit(0);
+}
+
+static void poll_stats(int interval, int ifindex)
+{
+	unsigned int nr_cpus = bpf_num_possible_cpus();
+	__u64 values[nr_cpus], prev[nr_cpus];
+
+	memset(prev, 0, sizeof(prev));
+
+	while (1) {
+		__u64 sum = 0;
+		__u32 key = 0;
+		int i;
+
+		sleep(interval);
+		assert(bpf_map_lookup_elem(map_fd[1], &key, values) == 0);
+		for (i = 0; i < nr_cpus; i++)
+			sum += (values[i] - prev[i]);
+		if (sum)
+			printf("ifindex %i: %10llu pkt/s\n",
+			       ifindex, sum / interval);
+		memcpy(prev, values, sizeof(values));
+	}
+}
+
+static void usage(const char *prog)
+{
+	fprintf(stderr,
+		"usage: %s [OPTS] IFINDEX_IN IFINDEX_OUT\n\n"
+		"OPTS:\n"
+		"    -S    use skb-mode\n"
+		"    -N    enforce native mode\n",
+		prog);
+}
+
+int main(int argc, char **argv)
+{
+	const char *optstr = "SN";
+	char filename[256];
+	int ret, opt, key = 0;
+
+	while ((opt = getopt(argc, argv, optstr)) != -1) {
+		switch (opt) {
+		case 'S':
+			xdp_flags |= XDP_FLAGS_SKB_MODE;
+			break;
+		case 'N':
+			xdp_flags |= XDP_FLAGS_DRV_MODE;
+			break;
+		default:
+			usage(basename(argv[0]));
+			return 1;
+		}
+	}
+
+	if (optind == argc) {
+		printf("usage: %s IFINDEX_IN IFINDEX_OUT\n", argv[0]);
+		return 1;
+	}
+
+	ifindex_in = strtoul(argv[optind], NULL, 0);
+	ifindex_out = strtoul(argv[optind + 1], NULL, 0);
+	printf("input: %d output: %d\n", ifindex_in, ifindex_out);
+
+	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+
+	if (load_bpf_file(filename)) {
+		printf("%s", bpf_log_buf);
+		return 1;
+	}
+
+	if (!prog_fd[0]) {
+		printf("load_bpf_file: %s\n", strerror(errno));
+		return 1;
+	}
+
+	if (set_link_xdp_fd(ifindex_in, prog_fd[0], xdp_flags) < 0) {
+		printf("ERROR: link set xdp fd failed on %d\n", ifindex_in);
+		return 1;
+	}
+
+	/* Loading dummy XDP prog on out-device */
+	if (set_link_xdp_fd(ifindex_out, prog_fd[1],
+			    (xdp_flags | XDP_FLAGS_UPDATE_IF_NOEXIST)) < 0) {
+		printf("WARN: link set xdp fd failed on %d\n", ifindex_out);
+		ifindex_out_xdp_dummy_attached = false;
+	}
+
+	signal(SIGINT, int_exit);
+	signal(SIGTERM, int_exit);
+
+	printf("map[0] (vports) = %i, map[1] (map) = %i, map[2] (count) = %i\n",
+		map_fd[0], map_fd[1], map_fd[2]);
+
+	/* populate virtual to physical port map */
+	ret = bpf_map_update_elem(map_fd[0], &key, &ifindex_out, 0);
+	if (ret) {
+		perror("bpf_update_elem");
+		goto out;
+	}
+
+	poll_stats(2, ifindex_out);
+
+out:
+	return 0;
+}