diff options
author | Jakub Kicinski <kuba@kernel.org> | 2024-05-10 03:57:04 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-06-27 14:52:15 +0300 |
commit | 82552bd04c9d2c40633d2e477cbab84dd5293af6 (patch) | |
tree | f5d3935369d267b83ab4aebf56b6ffabe678f61a /tools | |
parent | f6824c5a98bcd6c8dc1161cf1a09c00147dd3dd3 (diff) | |
download | linux-82552bd04c9d2c40633d2e477cbab84dd5293af6.tar.xz |
selftests: net: fix timestamp not arriving in cmsg_time.sh
[ Upstream commit 2d3b8dfd82d76b1295167c6453d683ab99e50794 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools')
-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: |