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297 lines
6.4 KiB
C
297 lines
6.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Test the SO_TXTIME API
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*
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* Takes two streams of { payload, delivery time }[], one input and one output.
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* Sends the input stream and verifies arrival matches the output stream.
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* The two streams can differ due to out-of-order delivery and drops.
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*/
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#define _GNU_SOURCE
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#include <arpa/inet.h>
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#include <error.h>
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#include <errno.h>
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#include <linux/net_tstamp.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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static int cfg_clockid = CLOCK_TAI;
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static bool cfg_do_ipv4;
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static bool cfg_do_ipv6;
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static uint16_t cfg_port = 8000;
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static int cfg_variance_us = 2000;
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static uint64_t glob_tstart;
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/* encode one timed transmission (of a 1B payload) */
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struct timed_send {
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char data;
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int64_t delay_us;
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};
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#define MAX_NUM_PKT 8
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static struct timed_send cfg_in[MAX_NUM_PKT];
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static struct timed_send cfg_out[MAX_NUM_PKT];
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static int cfg_num_pkt;
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static uint64_t gettime_ns(void)
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{
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struct timespec ts;
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if (clock_gettime(cfg_clockid, &ts))
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error(1, errno, "gettime");
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return ts.tv_sec * (1000ULL * 1000 * 1000) + ts.tv_nsec;
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}
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static void do_send_one(int fdt, struct timed_send *ts)
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{
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char control[CMSG_SPACE(sizeof(uint64_t))];
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struct msghdr msg = {0};
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struct iovec iov = {0};
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struct cmsghdr *cm;
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uint64_t tdeliver;
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int ret;
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iov.iov_base = &ts->data;
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iov.iov_len = 1;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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if (ts->delay_us >= 0) {
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memset(control, 0, sizeof(control));
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msg.msg_control = &control;
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msg.msg_controllen = sizeof(control);
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tdeliver = glob_tstart + ts->delay_us * 1000;
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cm = CMSG_FIRSTHDR(&msg);
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cm->cmsg_level = SOL_SOCKET;
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cm->cmsg_type = SCM_TXTIME;
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cm->cmsg_len = CMSG_LEN(sizeof(tdeliver));
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memcpy(CMSG_DATA(cm), &tdeliver, sizeof(tdeliver));
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}
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ret = sendmsg(fdt, &msg, 0);
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if (ret == -1)
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error(1, errno, "write");
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if (ret == 0)
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error(1, 0, "write: 0B");
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}
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static void do_recv_one(int fdr, struct timed_send *ts)
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{
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int64_t tstop, texpect;
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char rbuf[2];
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int ret;
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ret = recv(fdr, rbuf, sizeof(rbuf), 0);
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if (ret == -1)
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error(1, errno, "read");
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if (ret != 1)
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error(1, 0, "read: %dB", ret);
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tstop = (gettime_ns() - glob_tstart) / 1000;
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texpect = ts->delay_us >= 0 ? ts->delay_us : 0;
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fprintf(stderr, "payload:%c delay:%ld expected:%ld (us)\n",
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rbuf[0], tstop, texpect);
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if (rbuf[0] != ts->data)
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error(1, 0, "payload mismatch. expected %c", ts->data);
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if (labs(tstop - texpect) > cfg_variance_us)
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error(1, 0, "exceeds variance (%d us)", cfg_variance_us);
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}
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static void do_recv_verify_empty(int fdr)
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{
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char rbuf[1];
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int ret;
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ret = recv(fdr, rbuf, sizeof(rbuf), 0);
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if (ret != -1 || errno != EAGAIN)
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error(1, 0, "recv: not empty as expected (%d, %d)", ret, errno);
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}
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static void setsockopt_txtime(int fd)
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{
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struct sock_txtime so_txtime_val = { .clockid = cfg_clockid };
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struct sock_txtime so_txtime_val_read = { 0 };
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socklen_t vallen = sizeof(so_txtime_val);
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if (setsockopt(fd, SOL_SOCKET, SO_TXTIME,
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&so_txtime_val, sizeof(so_txtime_val)))
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error(1, errno, "setsockopt txtime");
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if (getsockopt(fd, SOL_SOCKET, SO_TXTIME,
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&so_txtime_val_read, &vallen))
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error(1, errno, "getsockopt txtime");
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if (vallen != sizeof(so_txtime_val) ||
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memcmp(&so_txtime_val, &so_txtime_val_read, vallen))
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error(1, 0, "getsockopt txtime: mismatch");
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}
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static int setup_tx(struct sockaddr *addr, socklen_t alen)
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{
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int fd;
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fd = socket(addr->sa_family, SOCK_DGRAM, 0);
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if (fd == -1)
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error(1, errno, "socket t");
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if (connect(fd, addr, alen))
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error(1, errno, "connect");
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setsockopt_txtime(fd);
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return fd;
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}
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static int setup_rx(struct sockaddr *addr, socklen_t alen)
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{
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struct timeval tv = { .tv_usec = 100 * 1000 };
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int fd;
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fd = socket(addr->sa_family, SOCK_DGRAM, 0);
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if (fd == -1)
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error(1, errno, "socket r");
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if (bind(fd, addr, alen))
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error(1, errno, "bind");
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if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)))
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error(1, errno, "setsockopt rcv timeout");
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return fd;
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}
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static void do_test(struct sockaddr *addr, socklen_t alen)
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{
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int fdt, fdr, i;
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fprintf(stderr, "\nSO_TXTIME ipv%c clock %s\n",
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addr->sa_family == PF_INET ? '4' : '6',
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cfg_clockid == CLOCK_TAI ? "tai" : "monotonic");
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fdt = setup_tx(addr, alen);
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fdr = setup_rx(addr, alen);
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glob_tstart = gettime_ns();
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for (i = 0; i < cfg_num_pkt; i++)
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do_send_one(fdt, &cfg_in[i]);
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for (i = 0; i < cfg_num_pkt; i++)
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do_recv_one(fdr, &cfg_out[i]);
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do_recv_verify_empty(fdr);
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if (close(fdr))
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error(1, errno, "close r");
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if (close(fdt))
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error(1, errno, "close t");
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}
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static int parse_io(const char *optarg, struct timed_send *array)
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{
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char *arg, *tok;
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int aoff = 0;
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arg = strdup(optarg);
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if (!arg)
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error(1, errno, "strdup");
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while ((tok = strtok(arg, ","))) {
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arg = NULL; /* only pass non-zero on first call */
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if (aoff / 2 == MAX_NUM_PKT)
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error(1, 0, "exceeds max pkt count (%d)", MAX_NUM_PKT);
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if (aoff & 1) { /* parse delay */
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array->delay_us = strtol(tok, NULL, 0) * 1000;
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array++;
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} else { /* parse character */
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array->data = tok[0];
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}
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aoff++;
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}
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free(arg);
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return aoff / 2;
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}
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static void parse_opts(int argc, char **argv)
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{
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int c, ilen, olen;
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while ((c = getopt(argc, argv, "46c:")) != -1) {
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switch (c) {
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case '4':
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cfg_do_ipv4 = true;
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break;
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case '6':
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cfg_do_ipv6 = true;
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break;
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case 'c':
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if (!strcmp(optarg, "tai"))
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cfg_clockid = CLOCK_TAI;
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else if (!strcmp(optarg, "monotonic") ||
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!strcmp(optarg, "mono"))
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cfg_clockid = CLOCK_MONOTONIC;
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else
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error(1, 0, "unknown clock id %s", optarg);
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break;
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default:
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error(1, 0, "parse error at %d", optind);
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}
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}
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if (argc - optind != 2)
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error(1, 0, "Usage: %s [-46] -c <clock> <in> <out>", argv[0]);
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ilen = parse_io(argv[optind], cfg_in);
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olen = parse_io(argv[optind + 1], cfg_out);
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if (ilen != olen)
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error(1, 0, "i/o streams len mismatch (%d, %d)\n", ilen, olen);
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cfg_num_pkt = ilen;
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}
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int main(int argc, char **argv)
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{
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parse_opts(argc, argv);
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if (cfg_do_ipv6) {
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struct sockaddr_in6 addr6 = {0};
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addr6.sin6_family = AF_INET6;
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addr6.sin6_port = htons(cfg_port);
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addr6.sin6_addr = in6addr_loopback;
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do_test((void *)&addr6, sizeof(addr6));
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}
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if (cfg_do_ipv4) {
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struct sockaddr_in addr4 = {0};
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addr4.sin_family = AF_INET;
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addr4.sin_port = htons(cfg_port);
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addr4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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do_test((void *)&addr4, sizeof(addr4));
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}
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return 0;
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}
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