Function rack_log_retran_reason

freebsd/netinet/tcp_stacks/rack.c:1635–1672

}

static void
rack_log_retran_reason(struct tcp_rack *rack, struct rack_sendmap *rsm, uint32_t tsused, uint32_t thresh, int mod)
{
	if (rack->rc_tp->t_logstate != TCP_LOG_STATE_OFF) {
		union tcp_log_stackspecific log;
		struct timeval tv;

		if ((mod != 1) && (rack_verbose_logging == 0)) {
			/*
			 * We get 3 values currently for mod
			 * 1 - We are retransmitting and this tells the reason.
			 * 2 - We are clearing a dup-ack count.
			 * 3 - We are incrementing a dup-ack count.
			 *
			 * The clear/increment are only logged
			 * if you have BBverbose on.
			 */
			return;
		}
		memset(&log.u_bbr, 0, sizeof(log.u_bbr));
		log.u_bbr.flex1 = tsused;
		log.u_bbr.flex2 = thresh;
		log.u_bbr.flex3 = rsm->r_flags;
		log.u_bbr.flex4 = rsm->r_dupack;
		log.u_bbr.flex5 = rsm->r_start;
		log.u_bbr.flex6 = rsm->r_end;
		log.u_bbr.flex8 = mod;
		log.u_bbr.inhpts = rack->rc_inp->inp_in_hpts;
		log.u_bbr.ininput = rack->rc_inp->inp_in_input;
		log.u_bbr.timeStamp = tcp_get_usecs(&tv);
		log.u_bbr.inflight = ctf_flight_size(rack->rc_tp, rack->r_ctl.rc_sacked);
		TCP_LOG_EVENTP(rack->rc_tp, NULL,
		    &rack->rc_inp->inp_socket->so_rcv,
		    &rack->rc_inp->inp_socket->so_snd,
		    BBR_LOG_SETTINGS_CHG, 0,
		    0, &log, false, &tv);
	}
}

static void
rack_log_to_start(struct tcp_rack *rack, uint32_t cts, uint32_t to, int32_t slot, uint8_t which)