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[TCP]: Abstract tp->highest_sack accessing & point to next skb

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Pointing to the next skb is necessary to avoid referencing
already SACKed skbs which will soon be on a separate list.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2007-12-02 00:48:06 +02:00 • committed by David S. Miller
parent 7201883599
commit 6859d49475
3 changed files with 52 additions and 21 deletions
Download patch file Download diff file Expand all files Collapse all files

27
net/ipv4/tcp_input.c
View file

@ -1125,7 +1125,7 @@ static void tcp_mark_lost_retrans(struct sock *sk)
struct sk_buff *skb;
int cnt = 0;
u32 new_low_seq = tp->snd_nxt;
u32 received_upto = TCP_SKB_CB(tp->highest_sack)->end_seq;
u32 received_upto = tcp_highest_sack_seq(tp);
if (!tcp_is_fack(tp) || !tp->retrans_out ||
!after(received_upto, tp->lost_retrans_low) ||
@ -1236,9 +1236,10 @@ static int tcp_match_skb_to_sack(struct sock *sk, struct sk_buff *skb,
return in_sack;
}
static int tcp_sacktag_one(struct sk_buff *skb, struct tcp_sock *tp,
static int tcp_sacktag_one(struct sk_buff *skb, struct sock *sk,
int *reord, int dup_sack, int fack_count)
{
struct tcp_sock *tp = tcp_sk(sk);
u8 sacked = TCP_SKB_CB(skb)->sacked;
int flag = 0;
@ -1307,8 +1308,8 @@ static int tcp_sacktag_one(struct sk_buff *skb, struct tcp_sock *tp,
if (fack_count > tp->fackets_out)
tp->fackets_out = fack_count;
if (after(TCP_SKB_CB(skb)->seq, tcp_highest_sack_seq(tp)))
tp->highest_sack = skb;
if (!before(TCP_SKB_CB(skb)->seq, tcp_highest_sack_seq(tp)))
tcp_advance_highest_sack(sk, skb);
}
/* D-SACK. We can detect redundant retransmission in S|R and plain R
@ -1330,8 +1331,6 @@ static struct sk_buff *tcp_sacktag_walk(struct sk_buff *skb, struct sock *sk,
int dup_sack_in, int *fack_count,
int *reord, int *flag)
{
struct tcp_sock *tp = tcp_sk(sk);
tcp_for_write_queue_from(skb, sk) {
int in_sack = 0;
int dup_sack = dup_sack_in;
@ -1358,7 +1357,7 @@ static struct sk_buff *tcp_sacktag_walk(struct sk_buff *skb, struct sock *sk,
break;
if (in_sack)
*flag |= tcp_sacktag_one(skb, tp, reord, dup_sack, *fack_count);
*flag |= tcp_sacktag_one(skb, sk, reord, dup_sack, *fack_count);
*fack_count += tcp_skb_pcount(skb);
}
@ -1429,7 +1428,7 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
if (!tp->sacked_out) {
if (WARN_ON(tp->fackets_out))
tp->fackets_out = 0;
tp->highest_sack = tcp_write_queue_head(sk);
tcp_highest_sack_reset(sk);
}
found_dup_sack = tcp_check_dsack(tp, ack_skb, sp_wire,
@ -1552,9 +1551,11 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
&fack_count, &reord, &flag);
/* ...tail remains todo... */
if (TCP_SKB_CB(tp->highest_sack)->end_seq == cache->end_seq) {
if (tcp_highest_sack_seq(tp) == cache->end_seq) {
/* ...but better entrypoint exists! */
skb = tcp_write_queue_next(sk, tp->highest_sack);
skb = tcp_highest_sack(sk);
if (skb == NULL)
break;
fack_count = tp->fackets_out;
cache++;
goto walk;
@ -1566,8 +1567,10 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
continue;
}
if (tp->sacked_out && !before(start_seq, tcp_highest_sack_seq(tp))) {
skb = tcp_write_queue_next(sk, tp->highest_sack);
if (!before(start_seq, tcp_highest_sack_seq(tp))) {
skb = tcp_highest_sack(sk);
if (skb == NULL)
break;
fack_count = tp->fackets_out;
}
skb = tcp_sacktag_skip(skb, sk, start_seq);