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@xxxxxxxxxx>
---
tools/testing/selftests/net/cmsg_sender.c | 123 +++++++++++++++++++++-
1 file changed, 122 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/net/cmsg_sender.c b/tools/testing/selftests/net/cmsg_sender.c
index 5a722baa108b..24444dc72543 100644
--- a/tools/testing/selftests/net/cmsg_sender.c
+++ b/tools/testing/selftests/net/cmsg_sender.c
@@ -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;
--
2.34.1
