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[TCP]: Add highest_sack seqno, points to globally highest SACK 

It is guaranteed to be valid only when !tp->sacked_out. In most
cases this seqno is available in the last ACK but there is no
guarantee for that. The new fast recovery loss marking algorithm
needs this as entry point.

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 2007-03-24 21:03:23 -07:00 committed by David S. Miller
parent d961db358f
commit d738cd8fca
2 changed files with 9 additions and 1 deletions
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2
include/linux/tcp.h
View File

@ -333,6 +333,8 @@ struct tcp_sock {
struct tcp_sack_block_wire recv_sack_cache[4];
u32 highest_sack; /* Start seq of globally highest revd SACK (valid only in slowpath) */
/* from STCP, retrans queue hinting */
struct sk_buff* lost_skb_hint;

8
net/ipv4/tcp_input.c
View File

@ -979,8 +979,10 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
int i;
int first_sack_index;
if (!tp->sacked_out)
if (!tp->sacked_out) {
tp->fackets_out = 0;
tp->highest_sack = tp->snd_una;
}
prior_fackets = tp->fackets_out;
/* Check for D-SACK. */
@ -1217,6 +1219,10 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
if (fack_count > tp->fackets_out)
tp->fackets_out = fack_count;
if (after(TCP_SKB_CB(skb)->seq,
tp->highest_sack))
tp->highest_sack = TCP_SKB_CB(skb)->seq;
} else {
if (dup_sack && (sacked&TCPCB_RETRANS))
reord = min(fack_count, reord);