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[TCP]: Convert highest_sack to sk_buff to allow direct access

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It is going to replace the sack fastpath hint quite soon... :-)

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen
2007-11-15 19:41:46 -08:00
committed by David S. Miller
parent 85cc391c0e
commit a47e5a988a
4 changed files with 30 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
net/ipv4/tcp_output.c
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@@ -657,13 +657,15 @@ static void tcp_set_skb_tso_segs(struct sock *sk, struct sk_buff *skb, unsigned
* tweak SACK fastpath hint too as it would overwrite all changes unless
* hint is also changed.
*/
static void tcp_adjust_fackets_out(struct tcp_sock *tp, struct sk_buff *skb,
static void tcp_adjust_fackets_out(struct sock *sk, struct sk_buff *skb,
int decr)
{
struct tcp_sock *tp = tcp_sk(sk);
if (!tp->sacked_out || tcp_is_reno(tp))
return;
if (!before(tp->highest_sack, TCP_SKB_CB(skb)->seq))
if (!before(tcp_highest_sack_seq(tp), TCP_SKB_CB(skb)->seq))
tp->fackets_out -= decr;
/* cnt_hint is "off-by-one" compared with fackets_out (see sacktag) */
@@ -712,9 +714,8 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss
TCP_SKB_CB(buff)->end_seq = TCP_SKB_CB(skb)->end_seq;
TCP_SKB_CB(skb)->end_seq = TCP_SKB_CB(buff)->seq;
if (tcp_is_sack(tp) && tp->sacked_out &&
(TCP_SKB_CB(skb)->seq == tp->highest_sack))
tp->highest_sack = TCP_SKB_CB(buff)->seq;
if (tcp_is_sack(tp) && tp->sacked_out && (skb == tp->highest_sack))
tp->highest_sack = buff;
/* PSH and FIN should only be set in the second packet. */
flags = TCP_SKB_CB(skb)->flags;
@@ -772,7 +773,7 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss
tcp_dec_pcount_approx_int(&tp->sacked_out, diff);
tcp_verify_left_out(tp);
}
tcp_adjust_fackets_out(tp, skb, diff);
tcp_adjust_fackets_out(sk, skb, diff);
}
/* Link BUFF into the send queue. */
@@ -1712,7 +1713,7 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb, int m
tcp_skb_pcount(next_skb) != 1);
if (WARN_ON(tcp_is_sack(tp) && tp->sacked_out &&
(TCP_SKB_CB(next_skb)->seq == tp->highest_sack)))
(next_skb == tp->highest_sack)))
return;
/* Ok. We will be able to collapse the packet. */
@@ -1747,7 +1748,7 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb, int m
if (tcp_is_reno(tp) && tp->sacked_out)
tcp_dec_pcount_approx(&tp->sacked_out, next_skb);
tcp_adjust_fackets_out(tp, next_skb, tcp_skb_pcount(next_skb));
tcp_adjust_fackets_out(sk, next_skb, tcp_skb_pcount(next_skb));
tp->packets_out -= tcp_skb_pcount(next_skb);
/* changed transmit queue under us so clear hints */
@@ -2028,7 +2029,7 @@ void tcp_xmit_retransmit_queue(struct sock *sk)
break;
tp->forward_skb_hint = skb;
if (after(TCP_SKB_CB(skb)->seq, tp->highest_sack))
if (after(TCP_SKB_CB(skb)->seq, tcp_highest_sack_seq(tp)))
break;
if (tcp_packets_in_flight(tp) >= tp->snd_cwnd)