Jakub Kicinski wrote:
> 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'
>
> Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>
> diff --git a/tools/testing/selftests/net/cmsg_sender.c b/tools/testing/selftests/net/cmsg_sender.c
> index c79e65581dc3..f25268504937 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 int ts_seen = 0;
nit: mixing unsigned long and unsigned int
