Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/bpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/if_link.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <arpa/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <assert.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <libgen.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <sys/resource.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <net/if.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <sys/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <netdb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include "bpf/bpf.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include "bpf/libbpf.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include "xdping.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static int ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static void cleanup(int sig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	if (sig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		exit(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static int get_stats(int fd, __u16 count, __u32 raddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	struct pinginfo pinginfo = { 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	char inaddrbuf[INET_ADDRSTRLEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	struct in_addr inaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	__u16 i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	inaddr.s_addr = raddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	printf("\nXDP RTT data:\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	if (bpf_map_lookup_elem(fd, &raddr, &pinginfo)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		perror("bpf_map_lookup elem");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	for (i = 0; i < count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		if (pinginfo.times[i] == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		printf("64 bytes from %s: icmp_seq=%d ttl=64 time=%#.5f ms\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		       inet_ntop(AF_INET, &inaddr, inaddrbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 				 sizeof(inaddrbuf)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		       count + i + 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		       (double)pinginfo.times[i]/1000000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	if (i < count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		fprintf(stderr, "Expected %d samples, got %d.\n", count, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	bpf_map_delete_elem(fd, &raddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) static void show_usage(const char *prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	fprintf(stderr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		"usage: %s [OPTS] -I interface destination\n\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		"OPTS:\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		"    -c count		Stop after sending count requests\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		"			(default %d, max %d)\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		"    -I interface	interface name\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		"    -N			Run in driver mode\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		"    -s			Server mode\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		"    -S			Run in skb mode\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		prog, XDPING_DEFAULT_COUNT, XDPING_MAX_COUNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) int main(int argc, char **argv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	__u32 mode_flags = XDP_FLAGS_DRV_MODE | XDP_FLAGS_SKB_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	struct addrinfo *a, hints = { .ai_family = AF_INET };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	__u16 count = XDPING_DEFAULT_COUNT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	struct pinginfo pinginfo = { 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	const char *optstr = "c:I:NsS";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	struct bpf_program *main_prog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	int prog_fd = -1, map_fd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	struct sockaddr_in rin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	struct bpf_object *obj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct bpf_map *map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	char *ifname = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	char filename[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	int opt, ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	__u32 raddr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	int server = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	char cmd[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	while ((opt = getopt(argc, argv, optstr)) != -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		switch (opt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		case 'c':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			count = atoi(optarg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			if (count < 1 || count > XDPING_MAX_COUNT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 				fprintf(stderr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 					"min count is 1, max count is %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 					XDPING_MAX_COUNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		case 'I':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			ifname = optarg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			ifindex = if_nametoindex(ifname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			if (!ifindex) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 				fprintf(stderr, "Could not get interface %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 					ifname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		case 'N':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 			xdp_flags |= XDP_FLAGS_DRV_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		case 's':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			/* use server program */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			server = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		case 'S':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 			xdp_flags |= XDP_FLAGS_SKB_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			show_usage(basename(argv[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	if (!ifname) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		show_usage(basename(argv[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	if (!server && optind == argc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		show_usage(basename(argv[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if ((xdp_flags & mode_flags) == mode_flags) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		fprintf(stderr, "-N or -S can be specified, not both.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		show_usage(basename(argv[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if (!server) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		/* Only supports IPv4; see hints initiailization above. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		if (getaddrinfo(argv[optind], NULL, &hints, &a) || !a) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			fprintf(stderr, "Could not resolve %s\n", argv[optind]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		memcpy(&rin, a->ai_addr, sizeof(rin));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		raddr = rin.sin_addr.s_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		freeaddrinfo(a);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	if (setrlimit(RLIMIT_MEMLOCK, &r)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		perror("setrlimit(RLIMIT_MEMLOCK)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	if (bpf_prog_load(filename, BPF_PROG_TYPE_XDP, &obj, &prog_fd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		fprintf(stderr, "load of %s failed\n", filename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	main_prog = bpf_object__find_program_by_title(obj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 						      server ? "xdpserver" :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 							       "xdpclient");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (main_prog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		prog_fd = bpf_program__fd(main_prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	if (!main_prog || prog_fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		fprintf(stderr, "could not find xdping program");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	map = bpf_map__next(NULL, obj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	if (map)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		map_fd = bpf_map__fd(map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (!map || map_fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		fprintf(stderr, "Could not find ping map");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	signal(SIGINT, cleanup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	signal(SIGTERM, cleanup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	printf("Setting up XDP for %s, please wait...\n", ifname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	printf("XDP setup disrupts network connectivity, hit Ctrl+C to quit\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		fprintf(stderr, "Link set xdp fd failed for %s\n", ifname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (server) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		close(prog_fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		close(map_fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		printf("Running server on %s; press Ctrl+C to exit...\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		       ifname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		do { } while (1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	/* Start xdping-ing from last regular ping reply, e.g. for a count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	 * of 10 ICMP requests, we start xdping-ing using reply with seq number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	 * 10.  The reason the last "real" ping RTT is much higher is that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	 * the ping program sees the ICMP reply associated with the last
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	 * XDP-generated packet, so ping doesn't get a reply until XDP is done.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	pinginfo.seq = htons(count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	pinginfo.count = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (bpf_map_update_elem(map_fd, &raddr, &pinginfo, BPF_ANY)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		fprintf(stderr, "could not communicate with BPF map: %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 			strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		cleanup(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	/* We need to wait for XDP setup to complete. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	sleep(10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	snprintf(cmd, sizeof(cmd), "ping -c %d -I %s %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		 count, ifname, argv[optind]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	printf("\nNormal ping RTT data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	printf("[Ignore final RTT; it is distorted by XDP using the reply]\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	ret = system(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		ret = get_stats(map_fd, count, raddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	cleanup(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	if (prog_fd > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		close(prog_fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	if (map_fd > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		close(map_fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }