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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>
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1 changed files with 15 additions and 5 deletions
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@ -333,16 +333,17 @@ static const char *cs_ts_info2str(unsigned int info)
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return "unknown";
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return "unknown";
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}
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}
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static void
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static unsigned long
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cs_read_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz)
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cs_read_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz)
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{
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{
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struct sock_extended_err *see;
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struct sock_extended_err *see;
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struct scm_timestamping *ts;
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struct scm_timestamping *ts;
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unsigned long ts_seen = 0;
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struct cmsghdr *cmsg;
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struct cmsghdr *cmsg;
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int i, err;
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int i, err;
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if (!opt.ts.ena)
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if (!opt.ts.ena)
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return;
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return 0;
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msg->msg_control = cbuf;
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msg->msg_control = cbuf;
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msg->msg_controllen = cbuf_sz;
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msg->msg_controllen = cbuf_sz;
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@ -396,8 +397,11 @@ cs_read_cmsg(int fd, struct msghdr *msg, char *cbuf, size_t cbuf_sz)
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printf(" %5s ts%d %lluus\n",
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printf(" %5s ts%d %lluus\n",
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cs_ts_info2str(see->ee_info),
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cs_ts_info2str(see->ee_info),
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i, rel_time);
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i, rel_time);
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ts_seen |= 1 << see->ee_info;
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}
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}
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}
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}
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return ts_seen;
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}
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}
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static void ca_set_sockopts(int fd)
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static void ca_set_sockopts(int fd)
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@ -509,10 +513,16 @@ int main(int argc, char *argv[])
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err = ERN_SUCCESS;
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err = ERN_SUCCESS;
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if (opt.ts.ena) {
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if (opt.ts.ena) {
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/* Make sure all timestamps have time to loop back */
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unsigned long seen;
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usleep(opt.txtime.delay);
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int i;
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cs_read_cmsg(fd, &msg, cbuf, sizeof(cbuf));
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/* Make sure all timestamps have time to loop back */
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for (i = 0; i < 40; i++) {
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seen = cs_read_cmsg(fd, &msg, cbuf, sizeof(cbuf));
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if (seen & (1 << SCM_TSTAMP_SND))
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break;
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usleep(opt.txtime.delay / 20);
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}
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}
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}
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err_out:
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err_out:
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