static bool stp_timer_expired(struct stp_timer *, int elapsed, int timeout);
static void stp_send_bpdu(struct stp_port *, const void *, size_t)
static bool stp_timer_expired(struct stp_timer *, int elapsed, int timeout);
static void stp_send_bpdu(struct stp_port *, const void *, size_t)