1255 	/* We increase the RACK ordering window in rounds where we receive  in tcp_dsack_seen()
1256 	 * DSACKs that may have been due to reordering causing RACK to trigger  in tcp_dsack_seen()
1257 	 * a spurious fast recovery. Thus RACK ignores DSACKs that happen  in tcp_dsack_seen()
1259 	 * is timer-driven, not triggered by RACK).  in tcp_dsack_seen()
1262 		tp->rack.dsack_seen = 1;  in tcp_dsack_seen()
1580  * This is "Step 3: Advance RACK.xmit_time and update RACK.RTT" from
1581  * draft-cheng-tcpm-rack-00.txt
1602 	tp->rack.advanced = 1;  in tcp_rack_advance()
1603 	tp->rack.rtt_us = rtt_us;  in tcp_rack_advance()
1604 	if (tcp_skb_sent_after(xmit_time, tp->rack.mstamp,  in tcp_rack_advance()
1605 			       end_seq, tp->rack.end_seq)) {  in tcp_rack_advance()
1606 		tp->rack.mstamp = xmit_time;  in tcp_rack_advance()
1607 		tp->rack.end_seq = end_seq;  in tcp_rack_advance()
2678  *		RACK (RFC8985): RACK is a newer loss detection algorithm
2694  * is hidden in the RACK code in tcp_recovery.c and tcp_xmit_retransmit_queue().
2869 	tp->rack.advanced = 1; /* Force RACK to re-exam losses */  in tcp_undo_cwnd_reduction()
2911 	} else if (tp->rack.reo_wnd_persist) {  in tcp_try_undo_recovery()
2912 		tp->rack.reo_wnd_persist--;  in tcp_try_undo_recovery()
2927 		tp->rack.reo_wnd_persist = min(TCP_RACK_RECOVERY_THRESH,  in tcp_try_undo_dsack()
2928 					       tp->rack.reo_wnd_persist + 1);  in tcp_try_undo_dsack()
4232 /* Updates the RACK's reo_wnd based on DSACK and no. of recoveries.
4260 	if (before(rs->prior_delivered, tp->rack.last_delivered))  in tcp_rack_update_reo_wnd()
4261 		tp->rack.dsack_seen = 0;  in tcp_rack_update_reo_wnd()
4264 	if (tp->rack.dsack_seen) {  in tcp_rack_update_reo_wnd()
4265 		tp->rack.reo_wnd_steps = min_t(u32, 0xFF,  in tcp_rack_update_reo_wnd()
4266 					       tp->rack.reo_wnd_steps + 1);  in tcp_rack_update_reo_wnd()
4267 		tp->rack.dsack_seen = 0;  in tcp_rack_update_reo_wnd()
4268 		tp->rack.last_delivered = tp->delivered;  in tcp_rack_update_reo_wnd()
4269 		tp->rack.reo_wnd_persist = TCP_RACK_RECOVERY_THRESH;  in tcp_rack_update_reo_wnd()
4270 	} else if (!tp->rack.reo_wnd_persist) {  in tcp_rack_update_reo_wnd()
4271 		tp->rack.reo_wnd_steps = 1;  in tcp_rack_update_reo_wnd()
4428 	/* If needed, reset TLP/RTO timer when RACK doesn't set. */  in tcp_ack()