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| author | Jakub Kicinski <kuba@kernel.org> | 2024-05-09 17:57:04 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-05-10 18:22:00 -0700 |
| commit | 2d3b8dfd82d76b1295167c6453d683ab99e50794 (patch) | |
| tree | d5be1e2774ae66fbb2870e4aea357c8503fd7567 | |
| parent | b49bd37f0bfd7bbfedd54085d5ea4e854778d283 (diff) | |
| download | linux-stable-2d3b8dfd82d76b1295167c6453d683ab99e50794.tar.gz linux-stable-2d3b8dfd82d76b1295167c6453d683ab99e50794.tar.bz2 linux-stable-2d3b8dfd82d76b1295167c6453d683ab99e50794.zip | |
selftests: net: fix timestamp not arriving in cmsg_time.sh
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>
| -rw-r--r-- | tools/testing/selftests/net/cmsg_sender.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/tools/testing/selftests/net/cmsg_sender.c b/tools/testing/selftests/net/cmsg_sender.c index c79e65581dc3..161db24e3c40 100644 --- a/tools/testing/selftests/net/cmsg_sender.c +++ b/tools/testing/selftests/net/cmsg_sender.c @@ -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: |