From 4cd829995b86e0359796780d43d2f210cb5cf021 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ilpo=20J=C3=A4rvinen?= Date: Thu, 11 Oct 2007 17:34:57 -0700 Subject: [PATCH] [TCP]: No need to re-count fackets_out/sacked_out at RTO MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Both sacked_out and fackets_out are directly known from how parameter. Since fackets_out is accurate, there's no need for recounting (sacked_out was previously unnecessarily counted in the loop anyway). Signed-off-by: Ilpo Järvinen Signed-off-by: David S. Miller --- net/ipv4/tcp_input.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index bd18c252dee..a0660391213 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -1711,18 +1711,23 @@ static void tcp_enter_frto_loss(struct sock *sk, int allowed_segments, int flag) tcp_clear_retrans_hints_partial(tp); } -void tcp_clear_retrans(struct tcp_sock *tp) +static void tcp_clear_retrans_partial(struct tcp_sock *tp) { tp->retrans_out = 0; - - tp->fackets_out = 0; - tp->sacked_out = 0; tp->lost_out = 0; tp->undo_marker = 0; tp->undo_retrans = 0; } +void tcp_clear_retrans(struct tcp_sock *tp) +{ + tcp_clear_retrans_partial(tp); + + tp->fackets_out = 0; + tp->sacked_out = 0; +} + /* Enter Loss state. If "how" is not zero, forget all SACK information * and reset tags completely, otherwise preserve SACKs. If receiver * dropped its ofo queue, we will know this due to reneging detection. @@ -1732,7 +1737,6 @@ void tcp_enter_loss(struct sock *sk, int how) const struct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; - int cnt = 0; /* Reduce ssthresh if it has not yet been made inside this window. */ if (icsk->icsk_ca_state <= TCP_CA_Disorder || tp->snd_una == tp->high_seq || @@ -1746,7 +1750,10 @@ void tcp_enter_loss(struct sock *sk, int how) tp->snd_cwnd_stamp = tcp_time_stamp; tp->bytes_acked = 0; - tcp_clear_retrans(tp); + tcp_clear_retrans_partial(tp); + + if (tcp_is_reno(tp)) + tcp_reset_reno_sack(tp); if (!how) { /* Push undo marker, if it was plain RTO and nothing @@ -1754,13 +1761,15 @@ void tcp_enter_loss(struct sock *sk, int how) tp->undo_marker = tp->snd_una; tcp_clear_retrans_hints_partial(tp); } else { + tp->sacked_out = 0; + tp->fackets_out = 0; tcp_clear_all_retrans_hints(tp); } tcp_for_write_queue(skb, sk) { if (skb == tcp_send_head(sk)) break; - cnt += tcp_skb_pcount(skb); + if (TCP_SKB_CB(skb)->sacked&TCPCB_RETRANS) tp->undo_marker = 0; TCP_SKB_CB(skb)->sacked &= (~TCPCB_TAGBITS)|TCPCB_SACKED_ACKED; @@ -1768,9 +1777,6 @@ void tcp_enter_loss(struct sock *sk, int how) TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_ACKED; TCP_SKB_CB(skb)->sacked |= TCPCB_LOST; tp->lost_out += tcp_skb_pcount(skb); - } else { - tp->sacked_out += tcp_skb_pcount(skb); - tp->fackets_out = cnt; } } tcp_verify_left_out(tp); -- 2.20.1