1 // SPDX-License-Identifier: GPL-2.0
8 #include <netinet/if_ether.h>
9 #include <netinet/in.h>
10 #include <netinet/ip.h>
11 #include <netinet/ip6.h>
12 #include <netinet/udp.h>
20 #include <sys/socket.h>
22 #include <sys/types.h>
26 #define ETH_MAX_MTU 0xFFFFU
30 #define UDP_SEGMENT 103
34 #define SO_ZEROCOPY 60
38 #define MSG_ZEROCOPY 0x4000000
43 static bool cfg_cache_trash;
44 static int cfg_cpu = -1;
45 static int cfg_connected = true;
46 static int cfg_family = PF_UNSPEC;
47 static uint16_t cfg_mss;
48 static int cfg_payload_len = (1472 * 42);
49 static int cfg_port = 8000;
50 static int cfg_runtime_ms = -1;
51 static bool cfg_segment;
52 static bool cfg_sendmmsg;
54 static bool cfg_zerocopy;
56 static socklen_t cfg_alen;
57 static struct sockaddr_storage cfg_dst_addr;
59 static bool interrupted;
60 static char buf[NUM_PKT][ETH_MAX_MTU];
62 static void sigint_handler(int signum)
68 static unsigned long gettimeofday_ms(void)
72 gettimeofday(&tv, NULL);
73 return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
76 static int set_cpu(int cpu)
82 if (sched_setaffinity(0, sizeof(mask), &mask))
83 error(1, 0, "setaffinity %d", cpu);
88 static void setup_sockaddr(int domain, const char *str_addr, void *sockaddr)
90 struct sockaddr_in6 *addr6 = (void *) sockaddr;
91 struct sockaddr_in *addr4 = (void *) sockaddr;
95 addr4->sin_family = AF_INET;
96 addr4->sin_port = htons(cfg_port);
97 if (inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1)
98 error(1, 0, "ipv4 parse error: %s", str_addr);
101 addr6->sin6_family = AF_INET6;
102 addr6->sin6_port = htons(cfg_port);
103 if (inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1)
104 error(1, 0, "ipv6 parse error: %s", str_addr);
107 error(1, 0, "illegal domain");
111 static void flush_zerocopy(int fd)
113 struct msghdr msg = {0}; /* flush */
117 ret = recvmsg(fd, &msg, MSG_ERRQUEUE);
118 if (ret == -1 && errno == EAGAIN)
121 error(1, errno, "errqueue");
122 if (msg.msg_flags != (MSG_ERRQUEUE | MSG_CTRUNC))
123 error(1, 0, "errqueue: flags 0x%x\n", msg.msg_flags);
128 static int send_tcp(int fd, char *data)
130 int ret, done = 0, count = 0;
132 while (done < cfg_payload_len) {
133 ret = send(fd, data + done, cfg_payload_len - done,
134 cfg_zerocopy ? MSG_ZEROCOPY : 0);
136 error(1, errno, "write");
145 static int send_udp(int fd, char *data)
147 int ret, total_len, len, count = 0;
149 total_len = cfg_payload_len;
152 len = total_len < cfg_mss ? total_len : cfg_mss;
154 ret = sendto(fd, data, len, cfg_zerocopy ? MSG_ZEROCOPY : 0,
155 cfg_connected ? NULL : (void *)&cfg_dst_addr,
156 cfg_connected ? 0 : cfg_alen);
158 error(1, errno, "write");
160 error(1, errno, "write: %uB != %uB\n", ret, len);
169 static int send_udp_sendmmsg(int fd, char *data)
171 const int max_nr_msg = ETH_MAX_MTU / ETH_DATA_LEN;
172 struct mmsghdr mmsgs[max_nr_msg];
173 struct iovec iov[max_nr_msg];
174 unsigned int off = 0, left;
177 memset(mmsgs, 0, sizeof(mmsgs));
179 left = cfg_payload_len;
182 error(1, 0, "sendmmsg: exceeds max_nr_msg");
184 iov[i].iov_base = data + off;
185 iov[i].iov_len = cfg_mss < left ? cfg_mss : left;
187 mmsgs[i].msg_hdr.msg_iov = iov + i;
188 mmsgs[i].msg_hdr.msg_iovlen = 1;
190 off += iov[i].iov_len;
191 left -= iov[i].iov_len;
195 ret = sendmmsg(fd, mmsgs, i, cfg_zerocopy ? MSG_ZEROCOPY : 0);
197 error(1, errno, "sendmmsg");
202 static void send_udp_segment_cmsg(struct cmsghdr *cm)
206 cm->cmsg_level = SOL_UDP;
207 cm->cmsg_type = UDP_SEGMENT;
208 cm->cmsg_len = CMSG_LEN(sizeof(cfg_mss));
209 valp = (void *)CMSG_DATA(cm);
213 static int send_udp_segment(int fd, char *data)
215 char control[CMSG_SPACE(sizeof(cfg_mss))] = {0};
216 struct msghdr msg = {0};
217 struct iovec iov = {0};
221 iov.iov_len = cfg_payload_len;
226 msg.msg_control = control;
227 msg.msg_controllen = sizeof(control);
228 send_udp_segment_cmsg(CMSG_FIRSTHDR(&msg));
230 msg.msg_name = (void *)&cfg_dst_addr;
231 msg.msg_namelen = cfg_alen;
233 ret = sendmsg(fd, &msg, cfg_zerocopy ? MSG_ZEROCOPY : 0);
235 error(1, errno, "sendmsg");
236 if (ret != iov.iov_len)
237 error(1, 0, "sendmsg: %u != %lu\n", ret, iov.iov_len);
242 static void usage(const char *filepath)
244 error(1, 0, "Usage: %s [-46cmStuz] [-C cpu] [-D dst ip] [-l secs] [-p port] [-s sendsize]",
248 static void parse_opts(int argc, char **argv)
250 const char *bind_addr = NULL;
254 while ((c = getopt(argc, argv, "46cC:D:l:mp:s:Stuz")) != -1) {
257 if (cfg_family != PF_UNSPEC)
258 error(1, 0, "Pass one of -4 or -6");
259 cfg_family = PF_INET;
260 cfg_alen = sizeof(struct sockaddr_in);
263 if (cfg_family != PF_UNSPEC)
264 error(1, 0, "Pass one of -4 or -6");
265 cfg_family = PF_INET6;
266 cfg_alen = sizeof(struct sockaddr_in6);
269 cfg_cache_trash = true;
272 cfg_cpu = strtol(optarg, NULL, 0);
278 cfg_runtime_ms = strtoul(optarg, NULL, 10) * 1000;
284 cfg_port = strtoul(optarg, NULL, 0);
287 cfg_payload_len = strtoul(optarg, NULL, 0);
296 cfg_connected = false;
305 bind_addr = cfg_family == PF_INET6 ? "::" : "0.0.0.0";
307 setup_sockaddr(cfg_family, bind_addr, &cfg_dst_addr);
312 if (cfg_family == PF_UNSPEC)
313 error(1, 0, "must pass one of -4 or -6");
314 if (cfg_tcp && !cfg_connected)
315 error(1, 0, "connectionless tcp makes no sense");
316 if (cfg_segment && cfg_sendmmsg)
317 error(1, 0, "cannot combine segment offload and sendmmsg");
319 if (cfg_family == PF_INET)
320 hdrlen = sizeof(struct iphdr) + sizeof(struct udphdr);
322 hdrlen = sizeof(struct ip6_hdr) + sizeof(struct udphdr);
324 cfg_mss = ETH_DATA_LEN - hdrlen;
325 max_len = ETH_MAX_MTU - hdrlen;
327 if (cfg_payload_len > max_len)
328 error(1, 0, "payload length %u exceeds max %u",
329 cfg_payload_len, max_len);
332 static void set_pmtu_discover(int fd, bool is_ipv4)
334 int level, name, val;
338 name = IP_MTU_DISCOVER;
339 val = IP_PMTUDISC_DO;
342 name = IPV6_MTU_DISCOVER;
343 val = IPV6_PMTUDISC_DO;
346 if (setsockopt(fd, level, name, &val, sizeof(val)))
347 error(1, errno, "setsockopt path mtu");
350 int main(int argc, char **argv)
352 unsigned long num_msgs, num_sends;
353 unsigned long tnow, treport, tstop;
356 parse_opts(argc, argv);
361 for (i = 0; i < sizeof(buf[0]); i++)
362 buf[0][i] = 'a' + (i % 26);
363 for (i = 1; i < NUM_PKT; i++)
364 memcpy(buf[i], buf[0], sizeof(buf[0]));
366 signal(SIGINT, sigint_handler);
368 fd = socket(cfg_family, cfg_tcp ? SOCK_STREAM : SOCK_DGRAM, 0);
370 error(1, errno, "socket");
374 if (setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY, &val, sizeof(val)))
375 error(1, errno, "setsockopt zerocopy");
379 connect(fd, (void *)&cfg_dst_addr, cfg_alen))
380 error(1, errno, "connect");
383 set_pmtu_discover(fd, cfg_family == PF_INET);
385 num_msgs = num_sends = 0;
386 tnow = gettimeofday_ms();
387 tstop = tnow + cfg_runtime_ms;
388 treport = tnow + 1000;
393 num_sends += send_tcp(fd, buf[i]);
394 else if (cfg_segment)
395 num_sends += send_udp_segment(fd, buf[i]);
396 else if (cfg_sendmmsg)
397 num_sends += send_udp_sendmmsg(fd, buf[i]);
399 num_sends += send_udp(fd, buf[i]);
402 if (cfg_zerocopy && ((num_msgs & 0xF) == 0))
405 tnow = gettimeofday_ms();
406 if (tnow > treport) {
408 "%s tx: %6lu MB/s %8lu calls/s %6lu msg/s\n",
409 cfg_tcp ? "tcp" : "udp",
410 (num_msgs * cfg_payload_len) >> 20,
411 num_sends, num_msgs);
412 num_msgs = num_sends = 0;
413 treport = tnow + 1000;
416 /* cold cache when writing buffer */
418 i = ++i < NUM_PKT ? i : 0;
420 } while (!interrupted && (cfg_runtime_ms == -1 || tnow < tstop));
423 error(1, errno, "close");