PFSYNC_BULK_SND_IVAL_MS
timeout_add_msec(&sc->sc_bulk_snd.snd_tmo, PFSYNC_BULK_SND_IVAL_MS);
PFSYNC_BULK_SND_IVAL_MS);
t /= 1000 / PFSYNC_BULK_SND_IVAL_MS;