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