samples/bpf, xdpsock: Fix race when running for fix duration of time

When running xdpsock for a fix duration of time before terminating
using --duration=<n>, there is a race condition that may cause xdpsock
to terminate immediately.

When running for a fixed duration of time the check to determine when to
terminate execution is in is_benchmark_done() and is being executed in
the context of the poller thread,

    if (opt_duration > 0) {
            unsigned long dt = (get_nsecs() - start_time);

            if (dt >= opt_duration)
                    benchmark_done = true;
    }

However start_time is only set after the poller thread have been
created. This leaves a small window when the poller thread is starting
and calls is_benchmark_done() for the first time that start_time is not
yet set. In that case start_time have its initial value of 0 and the
duration check fails as it do not correlate correctly for the
applications start time and immediately sets benchmark_done which in
turn terminates the xdpsock application.

Fix this by setting start_time before creating the poller thread.

Fixes: d3f11b018f6c ("samples/bpf: xdpsock: Add duration option to specify how long to run")
Signed-off-by: Niklas Söderlund <niklas.soderlund@corigine.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220315102948.466436-1-niklas.soderlund@corigine.com

diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index 19288a2..6f3fe30 100644 (file)
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -1984,15 +1984,15 @@ int main(int argc, char **argv)
 
        setlocale(LC_ALL, "");
 
+       prev_time = get_nsecs();
+       start_time = prev_time;
+
        if (!opt_quiet) {
                ret = pthread_create(&pt, NULL, poller, NULL);
                if (ret)
                        exit_with_error(ret);
        }
 
-       prev_time = get_nsecs();
-       start_time = prev_time;
-
        /* Configure sched priority for better wake-up accuracy */
        memset(&schparam, 0, sizeof(schparam));
        schparam.sched_priority = opt_schprio;