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| author | Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> | 2008-04-07 22:31:38 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-04-07 22:31:38 -0700 |
| commit | 1b69d745397eac12b3f8a2eb6b799cd476aef282 (patch) | |
| tree | 5cf3ab06c6c6ebf1adc55d4a3aae17f6fd110521 /net | |
| parent | bfe87dbc7b4da5b05a1a78480e996787a500cc6f (diff) | |
| download | linux-3.10-1b69d745397eac12b3f8a2eb6b799cd476aef282.tar.gz linux-3.10-1b69d745397eac12b3f8a2eb6b799cd476aef282.tar.bz2 linux-3.10-1b69d745397eac12b3f8a2eb6b799cd476aef282.zip | |
[TCP]: Restore 2.6.24 mark_head_lost behavior for newreno/fack
The fast retransmission can be forced locally to the rfc3517
branch in tcp_update_scoreboard instead of making such fragile
constructs deeper in tcp_mark_head_lost.
This is necessary for the next patch which must not have
loopholes for cnt > packets check. As one can notice,
readability got some improvements too because of this :-).
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp_input.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 7facdb0f696..5573202f086 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -2134,7 +2134,7 @@ static void tcp_verify_retransmit_hint(struct tcp_sock *tp, struct sk_buff *skb) /* Mark head of queue up as lost. With RFC3517 SACK, the packets is * is against sacked "cnt", otherwise it's against facked "cnt" */ -static void tcp_mark_head_lost(struct sock *sk, int packets, int fast_rexmit) +static void tcp_mark_head_lost(struct sock *sk, int packets) { struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; @@ -2161,7 +2161,7 @@ static void tcp_mark_head_lost(struct sock *sk, int packets, int fast_rexmit) (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)) cnt += tcp_skb_pcount(skb); - if (((!fast_rexmit || (tp->lost_out > 0)) && (cnt > packets)) || + if ((cnt > packets) || after(TCP_SKB_CB(skb)->end_seq, tp->high_seq)) break; if (!(TCP_SKB_CB(skb)->sacked & (TCPCB_SACKED_ACKED|TCPCB_LOST))) { @@ -2180,17 +2180,17 @@ static void tcp_update_scoreboard(struct sock *sk, int fast_rexmit) struct tcp_sock *tp = tcp_sk(sk); if (tcp_is_reno(tp)) { - tcp_mark_head_lost(sk, 1, fast_rexmit); + tcp_mark_head_lost(sk, 1); } else if (tcp_is_fack(tp)) { int lost = tp->fackets_out - tp->reordering; if (lost <= 0) lost = 1; - tcp_mark_head_lost(sk, lost, fast_rexmit); + tcp_mark_head_lost(sk, lost); } else { int sacked_upto = tp->sacked_out - tp->reordering; - if (sacked_upto < 0) - sacked_upto = 0; - tcp_mark_head_lost(sk, sacked_upto, fast_rexmit); + if (sacked_upto < fast_rexmit) + sacked_upto = fast_rexmit; + tcp_mark_head_lost(sk, sacked_upto); } /* New heuristics: it is possible only after we switched @@ -2524,7 +2524,7 @@ static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked, int flag) before(tp->snd_una, tp->high_seq) && icsk->icsk_ca_state != TCP_CA_Open && tp->fackets_out > tp->reordering) { - tcp_mark_head_lost(sk, tp->fackets_out - tp->reordering, 0); + tcp_mark_head_lost(sk, tp->fackets_out - tp->reordering); NET_INC_STATS_BH(LINUX_MIB_TCPLOSS); } |