28 	return min((tcp_min_rtt(tp) >> 2) * tp->rack.reo_wnd_steps,  in tcp_rack_reo_wnd()
34 	return tp->rack.rtt_us + reo_wnd -  in tcp_rack_skb_timeout()
38 /* RACK loss detection (IETF draft draft-ietf-tcpm-rack-01):
46  * RACK: sent time delta to the latest delivered packet (time domain)
48  * The advantage of RACK is it applies to both original and retransmitted
76 		if (!tcp_skb_sent_after(tp->rack.mstamp,  in tcp_rack_detect_loss()
78 					tp->rack.end_seq, scb->end_seq))  in tcp_rack_detect_loss()
100 	if (!tp->rack.advanced)  in tcp_rack_mark_lost()
104 	tp->rack.advanced = 0;  in tcp_rack_mark_lost()
115  * This is "Step 3: Advance RACK.xmit_time and update RACK.RTT" from
116  * draft-cheng-tcpm-rack-00.txt
137 	tp->rack.advanced = 1;  in tcp_rack_advance()
138 	tp->rack.rtt_us = rtt_us;  in tcp_rack_advance()
139 	if (tcp_skb_sent_after(xmit_time, tp->rack.mstamp,  in tcp_rack_advance()
140 			       end_seq, tp->rack.end_seq)) {  in tcp_rack_advance()
141 		tp->rack.mstamp = xmit_time;  in tcp_rack_advance()
142 		tp->rack.end_seq = end_seq;  in tcp_rack_advance()
169 /* Updates the RACK's reo_wnd based on DSACK and no. of recoveries.
197 	if (before(rs->prior_delivered, tp->rack.last_delivered))  in tcp_rack_update_reo_wnd()
198 		tp->rack.dsack_seen = 0;  in tcp_rack_update_reo_wnd()
201 	if (tp->rack.dsack_seen) {  in tcp_rack_update_reo_wnd()
202 		tp->rack.reo_wnd_steps = min_t(u32, 0xFF,  in tcp_rack_update_reo_wnd()
203 					       tp->rack.reo_wnd_steps + 1);  in tcp_rack_update_reo_wnd()
204 		tp->rack.dsack_seen = 0;  in tcp_rack_update_reo_wnd()
205 		tp->rack.last_delivered = tp->delivered;  in tcp_rack_update_reo_wnd()
206 		tp->rack.reo_wnd_persist = TCP_RACK_RECOVERY_THRESH;  in tcp_rack_update_reo_wnd()
207 	} else if (!tp->rack.reo_wnd_persist) {  in tcp_rack_update_reo_wnd()
208 		tp->rack.reo_wnd_steps = 1;  in tcp_rack_update_reo_wnd()