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Commit 6475be16 authored by David S. Miller's avatar David S. Miller
Browse files

[TCP]: Keep TSO enabled even during loss events. 



All we need to do is resegment the queue so that
we record SACK information accurately.  The edges
of the SACK blocks guide our resegmenting decisions.

With help from Herbert Xu.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ef015786

include/net/tcp.h

+1 −0
Original line number Diff line number Diff line
@@ -454,6 +454,7 @@ extern int tcp_retransmit_skb(struct sock *, struct sk_buff *); 
extern void tcp_xmit_retransmit_queue(struct sock *);

extern void tcp_simple_retransmit(struct sock *);

extern int tcp_trim_head(struct sock *, struct sk_buff *, u32);

extern int tcp_fragment(struct sock *, struct sk_buff *, u32, unsigned int);



extern void tcp_send_probe0(struct sock *);

extern void tcp_send_partial(struct sock *);

net/ipv4/tcp_input.c

+24 −12
Original line number Diff line number Diff line
@@ -923,14 +923,6 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ 
	int flag = 0;

	int i;



	/* So, SACKs for already sent large segments will be lost.

	 * Not good, but alternative is to resegment the queue. */

	if (sk->sk_route_caps & NETIF_F_TSO) {

		sk->sk_route_caps &= ~NETIF_F_TSO;

		sock_set_flag(sk, SOCK_NO_LARGESEND);

		tp->mss_cache = tp->mss_cache;

	}



	if (!tp->sacked_out)

		tp->fackets_out = 0;

	prior_fackets = tp->fackets_out;
@@ -978,8 +970,8 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ 
			flag |= FLAG_DATA_LOST;



		sk_stream_for_retrans_queue(skb, sk) {

			u8 sacked = TCP_SKB_CB(skb)->sacked;

			int in_sack;

			int in_sack, pcount;

			u8 sacked;



			/* The retransmission queue is always in order, so

			 * we can short-circuit the walk early.
@@ -987,11 +979,31 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ 
			if (!before(TCP_SKB_CB(skb)->seq, end_seq))

				break;



			fack_count += tcp_skb_pcount(skb);

			pcount = tcp_skb_pcount(skb);



			if (pcount > 1 &&

			    (after(start_seq, TCP_SKB_CB(skb)->seq) ||

			     before(end_seq, TCP_SKB_CB(skb)->end_seq))) {

				unsigned int pkt_len;



				if (after(start_seq, TCP_SKB_CB(skb)->seq))

					pkt_len = (start_seq -

						   TCP_SKB_CB(skb)->seq);

				else

					pkt_len = (end_seq -

						   TCP_SKB_CB(skb)->seq);

				if (tcp_fragment(sk, skb, pkt_len, skb_shinfo(skb)->tso_size))

					break;

				pcount = tcp_skb_pcount(skb);

			}



			fack_count += pcount;



			in_sack = !after(start_seq, TCP_SKB_CB(skb)->seq) &&

				!before(end_seq, TCP_SKB_CB(skb)->end_seq);



			sacked = TCP_SKB_CB(skb)->sacked;



			/* Account D-SACK for retransmitted packet. */

			if ((dup_sack && in_sack) &&

			    (sacked & TCPCB_RETRANS) &&

net/ipv4/tcp_output.c

+20 −35
Original line number Diff line number Diff line
@@ -428,11 +428,11 @@ static void tcp_set_skb_tso_segs(struct sock *sk, struct sk_buff *skb, unsigned 
 * packet to the list.  This won't be called frequently, I hope. 

 * Remember, these are still headerless SKBs at this point.

 */

static int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss_now)

int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss_now)

{

	struct tcp_sock *tp = tcp_sk(sk);

	struct sk_buff *buff;

	int nsize;

	int nsize, old_factor;

	u16 flags;



	nsize = skb_headlen(skb) - len;
@@ -490,18 +490,29 @@ static int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned 
		tp->left_out -= tcp_skb_pcount(skb);

	}



	old_factor = tcp_skb_pcount(skb);



	/* Fix up tso_factor for both original and new SKB.  */

	tcp_set_skb_tso_segs(sk, skb, mss_now);

	tcp_set_skb_tso_segs(sk, buff, mss_now);



	/* If this packet has been sent out already, we must

	 * adjust the various packet counters.

	 */

	if (after(tp->snd_nxt, TCP_SKB_CB(buff)->end_seq)) {

		int diff = old_factor - tcp_skb_pcount(skb) -

			tcp_skb_pcount(buff);



		tp->packets_out -= diff;

		if (TCP_SKB_CB(skb)->sacked & TCPCB_LOST) {

		tp->lost_out += tcp_skb_pcount(skb);

		tp->left_out += tcp_skb_pcount(skb);

			tp->lost_out -= diff;

			tp->left_out -= diff;

		}

		if (diff > 0) {

			tp->fackets_out -= diff;

			if ((int)tp->fackets_out < 0)

				tp->fackets_out = 0;

		}



	if (TCP_SKB_CB(buff)->sacked&TCPCB_LOST) {

		tp->lost_out += tcp_skb_pcount(buff);

		tp->left_out += tcp_skb_pcount(buff);

	}



	/* Link BUFF into the send queue. */
@@ -1350,12 +1361,6 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb) 
	if (before(TCP_SKB_CB(skb)->seq, tp->snd_una)) {

		if (before(TCP_SKB_CB(skb)->end_seq, tp->snd_una))

			BUG();



		if (sk->sk_route_caps & NETIF_F_TSO) {

			sk->sk_route_caps &= ~NETIF_F_TSO;

			sock_set_flag(sk, SOCK_NO_LARGESEND);

		}



		if (tcp_trim_head(sk, skb, tp->snd_una - TCP_SKB_CB(skb)->seq))

			return -ENOMEM;

	}
@@ -1370,22 +1375,8 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb) 
		return -EAGAIN;



	if (skb->len > cur_mss) {

		int old_factor = tcp_skb_pcount(skb);

		int diff;



		if (tcp_fragment(sk, skb, cur_mss, cur_mss))

			return -ENOMEM; /* We'll try again later. */



		/* New SKB created, account for it. */

		diff = old_factor - tcp_skb_pcount(skb) -

		       tcp_skb_pcount(skb->next);

		tp->packets_out -= diff;



		if (diff > 0) {

			tp->fackets_out -= diff;

			if ((int)tp->fackets_out < 0)

				tp->fackets_out = 0;

		}

	}



	/* Collapse two adjacent packets if worthwhile and we can. */
@@ -1993,12 +1984,6 @@ int tcp_write_wakeup(struct sock *sk) 
				TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_PSH;

				if (tcp_fragment(sk, skb, seg_size, mss))

					return -1;

				/* SWS override triggered forced fragmentation.

				 * Disable TSO, the connection is too sick. */

				if (sk->sk_route_caps & NETIF_F_TSO) {

					sock_set_flag(sk, SOCK_NO_LARGESEND);

					sk->sk_route_caps &= ~NETIF_F_TSO;

				}

			} else if (!tcp_skb_pcount(skb))

				tcp_set_skb_tso_segs(sk, skb, mss);