[bpf-next,v4,22/22] samples: bpf: Convert xdp_redirect_map_multi to XDP samples helper

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 2b3d9e39c4f3..4dc20be5fb96 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -39,7 +39,6 @@  tprogs-y += lwt_len_hist
 tprogs-y += xdp_tx_iptunnel
 tprogs-y += test_map_in_map
 tprogs-y += per_socket_stats_example
-tprogs-y += xdp_redirect_map_multi
 tprogs-y += xdp_rxq_info
 tprogs-y += syscall_tp
 tprogs-y += cpustat
@@ -54,6 +53,7 @@  tprogs-y += ibumad
 tprogs-y += hbm
 
 tprogs-y += xdp_redirect_cpu
+tprogs-y += xdp_redirect_map_multi
 tprogs-y += xdp_redirect_map
 tprogs-y += xdp_redirect
 tprogs-y += xdp_monitor
@@ -100,7 +100,6 @@  lwt_len_hist-objs := lwt_len_hist_user.o
 xdp_tx_iptunnel-objs := xdp_tx_iptunnel_user.o
 test_map_in_map-objs := test_map_in_map_user.o
 per_socket_stats_example-objs := cookie_uid_helper_example.o
-xdp_redirect_map_multi-objs := xdp_redirect_map_multi_user.o
 xdp_rxq_info-objs := xdp_rxq_info_user.o
 syscall_tp-objs := syscall_tp_user.o
 cpustat-objs := cpustat_user.o
@@ -114,6 +113,7 @@  xdp_sample_pkts-objs := xdp_sample_pkts_user.o
 ibumad-objs := ibumad_user.o
 hbm-objs := hbm.o $(CGROUP_HELPERS)
 
+xdp_redirect_map_multi-objs := xdp_redirect_map_multi_user.o $(XDP_SAMPLE)
 xdp_redirect_cpu-objs := xdp_redirect_cpu_user.o $(XDP_SAMPLE)
 xdp_redirect_map-objs := xdp_redirect_map_user.o $(XDP_SAMPLE)
 xdp_redirect-objs := xdp_redirect_user.o $(XDP_SAMPLE)
@@ -310,6 +310,7 @@  $(BPF_SAMPLES_PATH)/*.c: verify_target_bpf $(LIBBPF)
 $(src)/*.c: verify_target_bpf $(LIBBPF)
 
 $(obj)/xdp_redirect_cpu_user.o: $(obj)/xdp_redirect_cpu.skel.h
+$(obj)/xdp_redirect_map_multi_user.o: $(obj)/xdp_redirect_map_multi.skel.h
 $(obj)/xdp_redirect_map_user.o: $(obj)/xdp_redirect_map.skel.h
 $(obj)/xdp_redirect_user.o: $(obj)/xdp_redirect.skel.h
 $(obj)/xdp_monitor_user.o: $(obj)/xdp_monitor.skel.h
diff --git a/samples/bpf/xdp_redirect_map_multi_user.c b/samples/bpf/xdp_redirect_map_multi_user.c
index 84cdbbed20b7..315314716121 100644
--- a/samples/bpf/xdp_redirect_map_multi_user.c
+++ b/samples/bpf/xdp_redirect_map_multi_user.c
@@ -1,7 +1,12 @@ 
 // SPDX-License-Identifier: GPL-2.0
+static const char *__doc__ =
+"XDP multi redirect tool, using BPF_MAP_TYPE_DEVMAP and BPF_F_BROADCAST flag for bpf_redirect_map\n"
+"Usage: xdp_redirect_map_multi <IFINDEX|IFNAME> <IFINDEX|IFNAME> ... <IFINDEX|IFNAME>\n";
+
 #include <linux/bpf.h>
 #include <linux/if_link.h>
 #include <assert.h>
+#include <getopt.h>
 #include <errno.h>
 #include <signal.h>
 #include <stdio.h>
@@ -15,106 +20,54 @@ 
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
-
-#include "bpf_util.h"
+#include <linux/if_ether.h>
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>
+#include "bpf_util.h"
+#include "xdp_sample_user.h"
+#include "xdp_redirect_map_multi.skel.h"
 
 #define MAX_IFACE_NUM 32
-
-static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
 static int ifaces[MAX_IFACE_NUM] = {};
-static int rxcnt_map_fd;
-
-static void int_exit(int sig)
-{
-	__u32 prog_id = 0;
-	int i;
-
-	for (i = 0; ifaces[i] > 0; i++) {
-		if (bpf_get_link_xdp_id(ifaces[i], &prog_id, xdp_flags)) {
-			printf("bpf_get_link_xdp_id failed\n");
-			exit(1);
-		}
-		if (prog_id)
-			bpf_set_link_xdp_fd(ifaces[i], -1, xdp_flags);
-	}
-
-	exit(0);
-}
-
-static void poll_stats(int interval)
-{
-	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(rxcnt_map_fd, &key, values) == 0);
-		for (i = 0; i < nr_cpus; i++)
-			sum += (values[i] - prev[i]);
-		if (sum)
-			printf("Forwarding %10llu pkt/s\n", sum / interval);
-		memcpy(prev, values, sizeof(values));
-	}
-}
-
-static int get_mac_addr(unsigned int ifindex, void *mac_addr)
-{
-	char ifname[IF_NAMESIZE];
-	struct ifreq ifr;
-	int fd, ret = -1;
-
-	fd = socket(AF_INET, SOCK_DGRAM, 0);
-	if (fd < 0)
-		return ret;
-
-	if (!if_indextoname(ifindex, ifname))
-		goto err_out;
-
-	strcpy(ifr.ifr_name, ifname);
+static int mask = SAMPLE_RX_CNT | SAMPLE_REDIRECT_ERR_MAP_CNT |
+		  SAMPLE_EXCEPTION_CNT | SAMPLE_DEVMAP_XMIT_CNT |
+		  SAMPLE_DEVMAP_XMIT_CNT_MULTI | SAMPLE_SKIP_HEADING;
 
-	if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0)
-		goto err_out;
+DEFINE_SAMPLE_INIT(xdp_redirect_map_multi);
 
-	memcpy(mac_addr, ifr.ifr_hwaddr.sa_data, 6 * sizeof(char));
-	ret = 0;
+static const struct option long_options[] = {
+	{ "help", no_argument, NULL, 'h' },
+	{ "skb-mode", no_argument, NULL, 'S' },
+	{ "force", no_argument, NULL, 'F' },
+	{ "load-egress", no_argument, NULL, 'X' },
+	{ "stats", no_argument, NULL, 's' },
+	{ "interval", required_argument, NULL, 'i' },
+	{ "verbose", no_argument, NULL, 'v' },
+	{}
+};
 
-err_out:
-	close(fd);
-	return ret;
-}
-
-static int update_mac_map(struct bpf_object *obj)
+static int update_mac_map(struct bpf_map *map)
 {
-	int i, ret = -1, mac_map_fd;
+	int mac_map_fd = bpf_map__fd(map);
 	unsigned char mac_addr[6];
 	unsigned int ifindex;
-
-	mac_map_fd = bpf_object__find_map_fd_by_name(obj, "mac_map");
-	if (mac_map_fd < 0) {
-		printf("find mac map fd failed\n");
-		return ret;
-	}
+	int i, ret = -1;
 
 	for (i = 0; ifaces[i] > 0; i++) {
 		ifindex = ifaces[i];
 
 		ret = get_mac_addr(ifindex, mac_addr);
 		if (ret < 0) {
-			printf("get interface %d mac failed\n", ifindex);
+			fprintf(stderr, "get interface %d mac failed\n",
+				ifindex);
 			return ret;
 		}
 
 		ret = bpf_map_update_elem(mac_map_fd, &ifindex, mac_addr, 0);
-		if (ret) {
-			perror("bpf_update_elem mac_map_fd");
+		if (ret < 0) {
+			fprintf(stderr, "Failed to update mac address for ifindex %d\n",
+				ifindex);
 			return ret;
 		}
 	}
@@ -122,181 +75,159 @@  static int update_mac_map(struct bpf_object *obj)
 	return 0;
 }
 
-static void usage(const char *prog)
-{
-	fprintf(stderr,
-		"usage: %s [OPTS] <IFNAME|IFINDEX> <IFNAME|IFINDEX> ...\n"
-		"OPTS:\n"
-		"    -S    use skb-mode\n"
-		"    -N    enforce native mode\n"
-		"    -F    force loading prog\n"
-		"    -X    load xdp program on egress\n",
-		prog);
-}
-
 int main(int argc, char **argv)
 {
-	int i, ret, opt, forward_map_fd, max_ifindex = 0;
-	struct bpf_program *ingress_prog, *egress_prog;
-	int ingress_prog_fd, egress_prog_fd = 0;
-	struct bpf_devmap_val devmap_val;
-	bool attach_egress_prog = false;
+	struct bpf_devmap_val devmap_val = {};
+	struct xdp_redirect_map_multi *skel;
+	struct bpf_program *ingress_prog;
+	bool xdp_devmap_attached = false;
+	struct bpf_map *forward_map;
+	int ret = EXIT_FAIL_OPTION;
+	unsigned long interval = 2;
 	char ifname[IF_NAMESIZE];
-	struct bpf_map *mac_map;
-	struct bpf_object *obj;
 	unsigned int ifindex;
-	char filename[256];
-
-	while ((opt = getopt(argc, argv, "SNFX")) != -1) {
+	bool generic = false;
+	bool force = false;
+	bool tried = false;
+	bool error = true;
+	int i, opt;
+
+	while ((opt = getopt_long(argc, argv, "hSFXi:vs",
+				  long_options, NULL)) != -1) {
 		switch (opt) {
 		case 'S':
-			xdp_flags |= XDP_FLAGS_SKB_MODE;
-			break;
-		case 'N':
-			/* default, set below */
+			generic = true;
+			/* devmap_xmit tracepoint not available */
+			mask &= ~(SAMPLE_DEVMAP_XMIT_CNT |
+				  SAMPLE_DEVMAP_XMIT_CNT_MULTI);
 			break;
 		case 'F':
-			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
+			force = true;
 			break;
 		case 'X':
-			attach_egress_prog = true;
+			xdp_devmap_attached = true;
+			break;
+		case 'i':
+			interval = strtoul(optarg, NULL, 0);
+			break;
+		case 'v':
+			sample_switch_mode();
 			break;
+		case 's':
+			mask |= SAMPLE_REDIRECT_MAP_CNT;
+			break;
+		case 'h':
+			error = false;
 		default:
-			usage(basename(argv[0]));
-			return 1;
+			sample_usage(argv, long_options, __doc__, mask, error);
+			return ret;
 		}
 	}
 
-	if (!(xdp_flags & XDP_FLAGS_SKB_MODE)) {
-		xdp_flags |= XDP_FLAGS_DRV_MODE;
-	} else if (attach_egress_prog) {
-		printf("Load xdp program on egress with SKB mode not supported yet\n");
-		return 1;
+	if (argc <= optind + 1) {
+		sample_usage(argv, long_options, __doc__, mask, error);
+		return ret;
 	}
 
-	if (optind == argc) {
-		printf("usage: %s <IFNAME|IFINDEX> <IFNAME|IFINDEX> ...\n", argv[0]);
-		return 1;
+	skel = xdp_redirect_map_multi__open();
+	if (!skel) {
+		fprintf(stderr, "Failed to xdp_redirect_map_multi__open: %s\n",
+			strerror(errno));
+		ret = EXIT_FAIL_BPF;
+		goto end;
 	}
 
-	printf("Get interfaces");
+	ret = sample_init_pre_load(skel);
+	if (ret < 0) {
+		fprintf(stderr, "Failed to sample_init_pre_load: %s\n", strerror(-ret));
+		ret = EXIT_FAIL_BPF;
+		goto end_destroy;
+	}
+
+	ret = EXIT_FAIL_OPTION;
 	for (i = 0; i < MAX_IFACE_NUM && argv[optind + i]; i++) {
 		ifaces[i] = if_nametoindex(argv[optind + i]);
 		if (!ifaces[i])
 			ifaces[i] = strtoul(argv[optind + i], NULL, 0);
 		if (!if_indextoname(ifaces[i], ifname)) {
-			perror("Invalid interface name or i");
-			return 1;
+			fprintf(stderr, "Bad interface index or name\n");
+			sample_usage(argv, long_options, __doc__, mask, true);
+			goto end_destroy;
 		}
 
-		/* Find the largest index number */
-		if (ifaces[i] > max_ifindex)
-			max_ifindex = ifaces[i];
-
-		printf(" %d", ifaces[i]);
-	}
-	printf("\n");
-
-	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
-
-	obj = bpf_object__open(filename);
-	if (libbpf_get_error(obj)) {
-		printf("ERROR: opening BPF object file failed\n");
-		obj = NULL;
-		goto err_out;
+		skel->rodata->from_match[i] = ifaces[i];
+		skel->rodata->to_match[i] = ifaces[i];
 	}
 
-	/* Reset the map size to max ifindex + 1 */
-	if (attach_egress_prog) {
-		mac_map = bpf_object__find_map_by_name(obj, "mac_map");
-		ret = bpf_map__resize(mac_map, max_ifindex + 1);
-		if (ret < 0) {
-			printf("ERROR: reset mac map size failed\n");
-			goto err_out;
-		}
+	ret = xdp_redirect_map_multi__load(skel);
+	if (ret < 0) {
+		fprintf(stderr, "Failed to xdp_redirect_map_multi__load: %s\n",
+			strerror(errno));
+		ret = EXIT_FAIL_BPF;
+		goto end_destroy;
 	}
 
-	/* load BPF program */
-	if (bpf_object__load(obj)) {
-		printf("ERROR: loading BPF object file failed\n");
-		goto err_out;
-	}
-
-	if (xdp_flags & XDP_FLAGS_SKB_MODE) {
-		ingress_prog = bpf_object__find_program_by_name(obj, "xdp_redirect_map_general");
-		forward_map_fd = bpf_object__find_map_fd_by_name(obj, "forward_map_general");
-	} else {
-		ingress_prog = bpf_object__find_program_by_name(obj, "xdp_redirect_map_native");
-		forward_map_fd = bpf_object__find_map_fd_by_name(obj, "forward_map_native");
-	}
-	if (!ingress_prog || forward_map_fd < 0) {
-		printf("finding ingress_prog/forward_map in obj file failed\n");
-		goto err_out;
-	}
-
-	ingress_prog_fd = bpf_program__fd(ingress_prog);
-	if (ingress_prog_fd < 0) {
-		printf("find ingress_prog fd failed\n");
-		goto err_out;
-	}
-
-	rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
-	if (rxcnt_map_fd < 0) {
-		printf("bpf_object__find_map_fd_by_name failed\n");
-		goto err_out;
-	}
-
-	if (attach_egress_prog) {
+	if (xdp_devmap_attached) {
 		/* Update mac_map with all egress interfaces' mac addr */
-		if (update_mac_map(obj) < 0) {
-			printf("Error: update mac map failed");
-			goto err_out;
+		if (update_mac_map(skel->maps.mac_map) < 0) {
+			fprintf(stderr, "Updating mac address failed\n");
+			ret = EXIT_FAIL;
+			goto end_destroy;
 		}
+	}
 
-		/* Find egress prog fd */
-		egress_prog = bpf_object__find_program_by_name(obj, "xdp_devmap_prog");
-		if (!egress_prog) {
-			printf("finding egress_prog in obj file failed\n");
-			goto err_out;
-		}
-		egress_prog_fd = bpf_program__fd(egress_prog);
-		if (egress_prog_fd < 0) {
-			printf("find egress_prog fd failed\n");
-			goto err_out;
-		}
+	ret = sample_init(skel, mask);
+	if (ret < 0) {
+		fprintf(stderr, "Failed to initialize sample: %s\n", strerror(-ret));
+		ret = EXIT_FAIL;
+		goto end_destroy;
 	}
 
-	/* Remove attached program when program is interrupted or killed */
-	signal(SIGINT, int_exit);
-	signal(SIGTERM, int_exit);
+	ingress_prog = skel->progs.xdp_redirect_map_native;
+	forward_map = skel->maps.forward_map_native;
 
-	/* Init forward multicast groups */
 	for (i = 0; ifaces[i] > 0; i++) {
 		ifindex = ifaces[i];
 
+		ret = EXIT_FAIL_XDP;
+restart:
 		/* bind prog_fd to each interface */
-		ret = bpf_set_link_xdp_fd(ifindex, ingress_prog_fd, xdp_flags);
-		if (ret) {
-			printf("Set xdp fd failed on %d\n", ifindex);
-			goto err_out;
+		if (sample_install_xdp(ingress_prog, ifindex, generic, force) < 0) {
+			if (generic && !tried) {
+				fprintf(stderr,
+					"Trying fallback to sizeof(int) as value_size for devmap in generic mode\n");
+				ingress_prog = skel->progs.xdp_redirect_map_general;
+				forward_map = skel->maps.forward_map_general;
+				tried = true;
+				goto restart;
+			}
+			goto end_destroy;
 		}
 
 		/* Add all the interfaces to forward group and attach
-		 * egress devmap programe if exist
+		 * egress devmap program if exist
 		 */
 		devmap_val.ifindex = ifindex;
-		devmap_val.bpf_prog.fd = egress_prog_fd;
-		ret = bpf_map_update_elem(forward_map_fd, &ifindex, &devmap_val, 0);
-		if (ret) {
-			perror("bpf_map_update_elem forward_map");
-			goto err_out;
+		if (xdp_devmap_attached)
+			devmap_val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_devmap_prog);
+		ret = bpf_map_update_elem(bpf_map__fd(forward_map), &ifindex, &devmap_val, 0);
+		if (ret < 0) {
+			fprintf(stderr, "Failed to update devmap value: %s\n",
+				strerror(errno));
+			ret = EXIT_FAIL_BPF;
+			goto end_destroy;
 		}
 	}
 
-	poll_stats(2);
-
-	return 0;
-
-err_out:
-	return 1;
+	ret = sample_run(interval, NULL, NULL);
+	if (ret < 0) {
+		fprintf(stderr, "Failed during sample run: %s\n", strerror(-ret));
+		ret = EXIT_FAIL;
+		goto end_destroy;
+	}
+	ret = EXIT_OK;
+end_destroy:
+	xdp_redirect_map_multi__destroy(skel);
+end:
+	sample_exit(ret);
 }
diff --git a/samples/bpf/xdp_sample_user.c b/samples/bpf/xdp_sample_user.c
index eb484c15492d..b32d82178199 100644
--- a/samples/bpf/xdp_sample_user.c
+++ b/samples/bpf/xdp_sample_user.c
@@ -1510,7 +1510,7 @@  static int sample_timer_cb(int timerfd, struct stats_record **rec,
 	if (ret < 0)
 		return ret;
 
-	if (sample_xdp_cnt == 2) {
+	if (sample_xdp_cnt == 2 && !(sample_mask & SAMPLE_SKIP_HEADING)) {
 		char fi[IFNAMSIZ];
 		char to[IFNAMSIZ];
 		const char *f, *t;
diff --git a/samples/bpf/xdp_sample_user.h b/samples/bpf/xdp_sample_user.h
index 3a678986cce2..d97465ff8c62 100644
--- a/samples/bpf/xdp_sample_user.h
+++ b/samples/bpf/xdp_sample_user.h
@@ -8,17 +8,18 @@ 
 #include "xdp_sample_shared.h"
 
 enum stats_mask {
-	_SAMPLE_REDIRECT_MAP        = 1U << 0,
-	SAMPLE_RX_CNT               = 1U << 1,
-	SAMPLE_REDIRECT_ERR_CNT     = 1U << 2,
-	SAMPLE_CPUMAP_ENQUEUE_CNT   = 1U << 3,
-	SAMPLE_CPUMAP_KTHREAD_CNT   = 1U << 4,
-	SAMPLE_EXCEPTION_CNT        = 1U << 5,
-	SAMPLE_DEVMAP_XMIT_CNT      = 1U << 6,
-	SAMPLE_REDIRECT_CNT         = 1U << 7,
-	SAMPLE_REDIRECT_MAP_CNT     = SAMPLE_REDIRECT_CNT | _SAMPLE_REDIRECT_MAP,
-	SAMPLE_REDIRECT_ERR_MAP_CNT = SAMPLE_REDIRECT_ERR_CNT | _SAMPLE_REDIRECT_MAP,
+	_SAMPLE_REDIRECT_MAP         = 1U << 0,
+	SAMPLE_RX_CNT                = 1U << 1,
+	SAMPLE_REDIRECT_ERR_CNT      = 1U << 2,
+	SAMPLE_CPUMAP_ENQUEUE_CNT    = 1U << 3,
+	SAMPLE_CPUMAP_KTHREAD_CNT    = 1U << 4,
+	SAMPLE_EXCEPTION_CNT         = 1U << 5,
+	SAMPLE_DEVMAP_XMIT_CNT       = 1U << 6,
+	SAMPLE_REDIRECT_CNT          = 1U << 7,
+	SAMPLE_REDIRECT_MAP_CNT      = SAMPLE_REDIRECT_CNT | _SAMPLE_REDIRECT_MAP,
+	SAMPLE_REDIRECT_ERR_MAP_CNT  = SAMPLE_REDIRECT_ERR_CNT | _SAMPLE_REDIRECT_MAP,
 	SAMPLE_DEVMAP_XMIT_CNT_MULTI = 1U << 8,
+	SAMPLE_SKIP_HEADING	     = 1U << 9,
 };
 
 /* Exit return codes */