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Commit 539d243f authored by Ilpo Järvinen's avatar Ilpo Järvinen Committed by David S. Miller
Browse files

[TCP]: Access to highest_sack obsoletes forward_cnt_hint 



In addition, added a reference about the purpose of the loop.

Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9bff40fd

include/linux/tcp.h

+0 −1
Original line number Diff line number Diff line
@@ -346,7 +346,6 @@ struct tcp_sock { 
	int     fastpath_cnt_hint;

	int     lost_cnt_hint;

	int     retransmit_cnt_hint;

	int     forward_cnt_hint;



	u16	advmss;		/* Advertised MSS			*/

	u16	prior_ssthresh; /* ssthresh saved at recovery start	*/

net/ipv4/tcp_output.c

+9 −14
Original line number Diff line number Diff line
@@ -1945,33 +1945,28 @@ void tcp_xmit_retransmit_queue(struct sock *sk) 
	 * and retransmission... Both ways have their merits...

	 *

	 * For now we do not retransmit anything, while we have some new

	 * segments to send.

	 * segments to send. In the other cases, follow rule 3 for

	 * NextSeg() specified in RFC3517.

	 */



	if (tcp_may_send_now(sk))

		return;



	if (tp->forward_skb_hint) {

	/* If nothing is SACKed, highest_sack in the loop won't be valid */

	if (!tp->sacked_out)

		return;



	if (tp->forward_skb_hint)

		skb = tp->forward_skb_hint;

		packet_cnt = tp->forward_cnt_hint;

	} else{

	else

		skb = tcp_write_queue_head(sk);

		packet_cnt = 0;

	}



	tcp_for_write_queue_from(skb, sk) {

		if (skb == tcp_send_head(sk))

			break;

		tp->forward_cnt_hint = packet_cnt;

		tp->forward_skb_hint = skb;



		/* Similar to the retransmit loop above we

		 * can pretend that the retransmitted SKB

		 * we send out here will be composed of one

		 * real MSS sized packet because tcp_retransmit_skb()

		 * will fragment it if necessary.

		 */

		if (++packet_cnt > tp->fackets_out)

		if (after(TCP_SKB_CB(skb)->seq, tp->highest_sack))

			break;



		if (tcp_packets_in_flight(tp) >= tp->snd_cwnd)