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selftests: net: fix timestamp not arriving in cmsg_time.sh

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On slow machines the SND timestamp sometimes doesn't arrive before
we quit. The test only waits as long as the packet delay, so it's
easy for a race condition to happen.

Double the wait but do a bit of polling, once the SND timestamp
arrives there's no point to wait any longer.

This fixes the "TXTIME abs" failures on debug kernels, like:

   Case ICMPv4  - TXTIME abs returned '', expected 'OK'

Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20240510005705.43069-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-05-09 17:57:04 -07:00
parent b49bd37f0b
commit 2d3b8dfd82
1 changed files with 15 additions and 5 deletions
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20
tools/testing/selftests/net/cmsg_sender.c
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@ -333,16 +333,17 @@ static const char *cs_ts_info2str(unsigned int info)
return "unknown";
}
static void
static unsigned long
cs_read_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz)
{
struct sock_extended_err *see;
struct scm_timestamping *ts;
unsigned long ts_seen = 0;
struct cmsghdr *cmsg;
int i, err;
if (!opt.ts.ena)
return;
return 0;
msg->msg_control = cbuf;
msg->msg_controllen = cbuf_sz;
@ -396,8 +397,11 @@ cs_read_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz)
printf(" %5s ts%d %lluus\n",
cs_ts_info2str(see->ee_info),
i, rel_time);
ts_seen |= 1 << see->ee_info;
}
}
return ts_seen;
}
static void ca_set_sockopts(int fd)
@ -509,10 +513,16 @@ int main(int argc, char *argv[])
err = ERN_SUCCESS;
if (opt.ts.ena) {
/* Make sure all timestamps have time to loop back */
usleep(opt.txtime.delay);
unsigned long seen;
int i;
cs_read_cmsg(fd, &msg, cbuf, sizeof(cbuf));
/* Make sure all timestamps have time to loop back */
for (i = 0; i < 40; i++) {
seen = cs_read_cmsg(fd, &msg, cbuf, sizeof(cbuf));
if (seen & (1 << SCM_TSTAMP_SND))
break;
usleep(opt.txtime.delay / 20);
}
}
err_out: