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selftests: net: cmsg_sender: support Tx timestamping

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Support requesting Tx timestamps:

 $ ./cmsg_sender -p i -t -4 $tgt 123 -d 1000
 SCHED ts0 61us
   SND ts0 1071us

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2022-02-09 16:36:48 -08:00 committed by David S. Miller
parent 4d397424a5
commit eb8f3116fb
1 changed files with 122 additions and 1 deletions
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123
tools/testing/selftests/net/cmsg_sender.c
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@ -8,6 +8,7 @@
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <linux/errqueue.h>
#include <linux/icmp.h>
#include <linux/icmpv6.h>
#include <linux/net_tstamp.h>
@ -27,6 +28,9 @@ enum {
ERN_CMSG_WR,
ERN_SOCKOPT,
ERN_GETTIME,
ERN_RECVERR,
ERN_CMSG_RD,
ERN_CMSG_RCV,
};
struct options {
@ -49,6 +53,9 @@ struct options {
bool ena;
unsigned int delay;
} txtime;
struct {
bool ena;
} ts;
} opt = {
.sock = {
.family = AF_UNSPEC,
@ -57,6 +64,7 @@ struct options {
},
};
static struct timespec time_start_real;
static struct timespec time_start_mono;
static void __attribute__((noreturn)) cs_usage(const char *bin)
@ -71,6 +79,7 @@ static void __attribute__((noreturn)) cs_usage(const char *bin)
"\t\t-m val Set SO_MARK with given value\n"
"\t\t-M val Set SO_MARK via setsockopt\n"
"\t\t-d val Set SO_TXTIME with given delay (usec)\n"
"\t\t-t Enable time stamp reporting\n"
"");
exit(ERN_HELP);
}
@ -79,7 +88,7 @@ static void cs_parse_args(int argc, char *argv[])
{
char o;
while ((o = getopt(argc, argv, "46sp:m:M:d:")) != -1) {
while ((o = getopt(argc, argv, "46sp:m:M:d:t")) != -1) {
switch (o) {
case 's':
opt.silent_send = true;
@ -114,6 +123,9 @@ static void cs_parse_args(int argc, char *argv[])
opt.txtime.ena = true;
opt.txtime.delay = atoi(optarg);
break;
case 't':
opt.ts.ena = true;
break;
}
}
@ -168,6 +180,25 @@ cs_write_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz)
cmsg->cmsg_len = CMSG_LEN(sizeof(txtime));
memcpy(CMSG_DATA(cmsg), &txtime, sizeof(txtime));
}
if (opt.ts.ena) {
__u32 val = SOF_TIMESTAMPING_SOFTWARE |
SOF_TIMESTAMPING_OPT_TSONLY;
if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING,
&val, sizeof(val)))
error(ERN_SOCKOPT, errno, "setsockopt TIMESTAMPING");
cmsg = (struct cmsghdr *)(cbuf + cmsg_len);
cmsg_len += CMSG_SPACE(sizeof(__u32));
if (cbuf_sz < cmsg_len)
error(ERN_CMSG_WR, EFAULT, "cmsg buffer too small");
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SO_TIMESTAMPING;
cmsg->cmsg_len = CMSG_LEN(sizeof(__u32));
*(__u32 *)CMSG_DATA(cmsg) = SOF_TIMESTAMPING_TX_SCHED |
SOF_TIMESTAMPING_TX_SOFTWARE;
}
if (cmsg_len)
msg->msg_controllen = cmsg_len;
@ -175,6 +206,86 @@ cs_write_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz)
msg->msg_control = NULL;
}
static const char *cs_ts_info2str(unsigned int info)
{
static const char *names[] = {
[SCM_TSTAMP_SND] = "SND",
[SCM_TSTAMP_SCHED] = "SCHED",
[SCM_TSTAMP_ACK] = "ACK",
};
if (info < sizeof(names) / sizeof(names[0]))
return names[info];
return "unknown";
}
static void
cs_read_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz)
{
struct sock_extended_err *see;
struct scm_timestamping *ts;
struct cmsghdr *cmsg;
int i, err;
if (!opt.ts.ena)
return;
msg->msg_control = cbuf;
msg->msg_controllen = cbuf_sz;
while (true) {
ts = NULL;
see = NULL;
memset(cbuf, 0, cbuf_sz);
err = recvmsg(fd, msg, MSG_ERRQUEUE);
if (err < 0) {
if (errno == EAGAIN)
break;
error(ERN_RECVERR, errno, "recvmsg ERRQ");
}
for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL;
cmsg = CMSG_NXTHDR(msg, cmsg)) {
if (cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SO_TIMESTAMPING_OLD) {
if (cmsg->cmsg_len < sizeof(*ts))
error(ERN_CMSG_RD, EINVAL, "TS cmsg");
ts = (void *)CMSG_DATA(cmsg);
}
if ((cmsg->cmsg_level == SOL_IP &&
cmsg->cmsg_type == IP_RECVERR) ||
(cmsg->cmsg_level == SOL_IPV6 &&
cmsg->cmsg_type == IPV6_RECVERR)) {
if (cmsg->cmsg_len < sizeof(*see))
error(ERN_CMSG_RD, EINVAL, "sock_err cmsg");
see = (void *)CMSG_DATA(cmsg);
}
}
if (!ts)
error(ERN_CMSG_RCV, ENOENT, "TS cmsg not found");
if (!see)
error(ERN_CMSG_RCV, ENOENT, "sock_err cmsg not found");
for (i = 0; i < 3; i++) {
unsigned long long rel_time;
if (!ts->ts[i].tv_sec && !ts->ts[i].tv_nsec)
continue;
rel_time = (ts->ts[i].tv_sec - time_start_real.tv_sec) *
(1000ULL * 1000) +
(ts->ts[i].tv_nsec - time_start_real.tv_nsec) /
1000;
printf(" %5s ts%d %lluus\n",
cs_ts_info2str(see->ee_info),
i, rel_time);
}
}
}
int main(int argc, char *argv[])
{
char buf[] = "blablablabla";
@ -227,6 +338,8 @@ int main(int argc, char *argv[])
&opt.sockopt.mark, sizeof(opt.sockopt.mark)))
error(ERN_SOCKOPT, errno, "setsockopt SO_MARK");
if (clock_gettime(CLOCK_REALTIME, &time_start_real))
error(ERN_GETTIME, errno, "gettime REALTIME");
if (clock_gettime(CLOCK_MONOTONIC, &time_start_mono))
error(ERN_GETTIME, errno, "gettime MONOTINIC");
@ -246,13 +359,21 @@ int main(int argc, char *argv[])
if (!opt.silent_send)
fprintf(stderr, "send failed: %s\n", strerror(errno));
err = ERN_SEND;
goto err_out;
} else if (err != sizeof(buf)) {
fprintf(stderr, "short send\n");
err = ERN_SEND_SHORT;
goto err_out;
} else {
err = ERN_SUCCESS;
}
/* Make sure all timestamps have time to loop back */
usleep(opt.txtime.delay);
cs_read_cmsg(fd, &msg, cbuf, sizeof(cbuf));
err_out:
close(fd);
freeaddrinfo(ai);
return err;