Function bbr_set_state_target

freebsd/netinet/tcp_stacks/bbr.c:10730–10771

}

static void
bbr_set_state_target(struct tcp_bbr *bbr, int line)
{
	uint32_t tar, meth;

	if ((bbr->rc_bbr_state == BBR_STATE_PROBE_RTT) &&
	    ((bbr->r_ctl.bbr_rttprobe_gain_val == 0) || bbr->rc_use_google)) {
		/* Special case using old probe-rtt method */
		tar = bbr_rtt_probe_cwndtarg * (bbr->rc_tp->t_maxseg - bbr->rc_last_options);
		meth = 1;
	} else {
		/* Non-probe-rtt case and reduced probe-rtt  */
		if ((bbr->rc_bbr_state == BBR_STATE_PROBE_BW) &&
		    (bbr->r_ctl.rc_bbr_hptsi_gain > BBR_UNIT)) {
			/* For gain cycle we use the hptsi gain */
			tar = bbr_get_a_state_target(bbr, bbr->r_ctl.rc_bbr_hptsi_gain);
			meth = 2;
		} else if ((bbr_target_is_bbunit) || bbr->rc_use_google) {
			/*
			 * If configured, or for google all other states
			 * get BBR_UNIT.
			 */
			tar = bbr_get_a_state_target(bbr, BBR_UNIT);
			meth = 3;
		} else {
			/*
			 * Or we set a target based on the pacing gain
			 * for non-google mode and default (non-configured).
			 * Note we don't set a target goal below drain (192).
			 */
			if (bbr->r_ctl.rc_bbr_hptsi_gain < bbr_hptsi_gain[BBR_SUB_DRAIN])  {
				tar = bbr_get_a_state_target(bbr, bbr_hptsi_gain[BBR_SUB_DRAIN]);
				meth = 4;
			} else {
				tar = bbr_get_a_state_target(bbr, bbr->r_ctl.rc_bbr_hptsi_gain);
				meth = 5;
			}
		}
	}
	bbr_log_set_of_state_target(bbr, tar, line, meth);
	bbr->r_ctl.rc_target_at_state = tar;
}

static void
bbr_enter_probe_rtt(struct tcp_bbr *bbr, uint32_t cts, int32_t line)