From 13fcf850cc20373db4dd8a5c9f349583ab3817c4 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ilpo=20J=C3=A4rvinen?= Date: Tue, 9 Oct 2007 01:28:45 -0700 Subject: [PATCH] [TCP]: Move accounting from tso_acked to clean_rtx_queue MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The accounting code is pretty much the same, so it's a shame we do it in two places. I'm not too sure if added fully_acked check in MTU probing is really what we want perhaps the added end_seq could be used in the after() comparison. Signed-off-by: Ilpo Järvinen Signed-off-by: David S. Miller --- net/ipv4/tcp_input.c | 81 +++++++++++++++++++------------------------- 1 file changed, 35 insertions(+), 46 deletions(-) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 31e7e339b567..4238ed98acb9 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -2525,14 +2525,12 @@ static void tcp_rearm_rto(struct sock *sk) } } -static int tcp_tso_acked(struct sock *sk, struct sk_buff *skb, - __u32 now, __s32 *seq_rtt) +static u32 tcp_tso_acked(struct sock *sk, struct sk_buff *skb) { struct tcp_sock *tp = tcp_sk(sk); struct tcp_skb_cb *scb = TCP_SKB_CB(skb); __u32 seq = tp->snd_una; __u32 packets_acked; - int acked = 0; /* If we get here, the whole TSO packet has not been * acked. @@ -2545,39 +2543,11 @@ static int tcp_tso_acked(struct sock *sk, struct sk_buff *skb, packets_acked -= tcp_skb_pcount(skb); if (packets_acked) { - __u8 sacked = scb->sacked; - - acked |= FLAG_DATA_ACKED; - if (sacked) { - if (sacked & TCPCB_RETRANS) { - if (sacked & TCPCB_SACKED_RETRANS) - tp->retrans_out -= packets_acked; - acked |= FLAG_RETRANS_DATA_ACKED; - *seq_rtt = -1; - } else if (*seq_rtt < 0) - *seq_rtt = now - scb->when; - if (sacked & TCPCB_SACKED_ACKED) - tp->sacked_out -= packets_acked; - if (sacked & TCPCB_LOST) - tp->lost_out -= packets_acked; - if (sacked & TCPCB_URG) { - if (tp->urg_mode && - !before(seq, tp->snd_up)) - tp->urg_mode = 0; - } - } else if (*seq_rtt < 0) - *seq_rtt = now - scb->when; - - /* hint's skb might be NULL but we don't need to care */ - tp->fastpath_cnt_hint -= min_t(u32, packets_acked, - tp->fastpath_cnt_hint); - tp->packets_out -= packets_acked; - BUG_ON(tcp_skb_pcount(skb) == 0); BUG_ON(!before(scb->seq, scb->end_seq)); } - return acked; + return packets_acked; } /* Remove acknowledged frames from the retransmission queue. */ @@ -2587,6 +2557,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p) const struct inet_connection_sock *icsk = inet_csk(sk); struct sk_buff *skb; __u32 now = tcp_time_stamp; + int fully_acked = 1; int acked = 0; int prior_packets = tp->packets_out; __s32 seq_rtt = -1; @@ -2595,6 +2566,8 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p) while ((skb = tcp_write_queue_head(sk)) && skb != tcp_send_head(sk)) { struct tcp_skb_cb *scb = TCP_SKB_CB(skb); + u32 end_seq; + u32 packets_acked; __u8 sacked = scb->sacked; /* If our packet is before the ack sequence we can @@ -2602,11 +2575,19 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p) * the other end. */ if (after(scb->end_seq, tp->snd_una)) { - if (tcp_skb_pcount(skb) > 1 && - after(tp->snd_una, scb->seq)) - acked |= tcp_tso_acked(sk, skb, - now, &seq_rtt); - break; + if (tcp_skb_pcount(skb) == 1 || + !after(tp->snd_una, scb->seq)) + break; + + packets_acked = tcp_tso_acked(sk, skb); + if (!packets_acked) + break; + + fully_acked = 0; + end_seq = tp->snd_una; + } else { + packets_acked = tcp_skb_pcount(skb); + end_seq = scb->end_seq; } /* Initial outgoing SYN's get put onto the write_queue @@ -2624,7 +2605,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p) } /* MTU probing checks */ - if (icsk->icsk_mtup.probe_size) { + if (fully_acked && icsk->icsk_mtup.probe_size) { if (!after(tp->mtu_probe.probe_seq_end, TCP_SKB_CB(skb)->end_seq)) { tcp_mtup_probe_success(sk, skb); } @@ -2633,27 +2614,32 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p) if (sacked) { if (sacked & TCPCB_RETRANS) { if (sacked & TCPCB_SACKED_RETRANS) - tp->retrans_out -= tcp_skb_pcount(skb); + tp->retrans_out -= packets_acked; acked |= FLAG_RETRANS_DATA_ACKED; seq_rtt = -1; } else if (seq_rtt < 0) { seq_rtt = now - scb->when; - last_ackt = skb->tstamp; + if (fully_acked) + last_ackt = skb->tstamp; } if (sacked & TCPCB_SACKED_ACKED) - tp->sacked_out -= tcp_skb_pcount(skb); + tp->sacked_out -= packets_acked; if (sacked & TCPCB_LOST) - tp->lost_out -= tcp_skb_pcount(skb); + tp->lost_out -= packets_acked; if (sacked & TCPCB_URG) { - if (tp->urg_mode && - !before(scb->end_seq, tp->snd_up)) + if (tp->urg_mode && !before(end_seq, tp->snd_up)) tp->urg_mode = 0; } } else if (seq_rtt < 0) { seq_rtt = now - scb->when; - last_ackt = skb->tstamp; + if (fully_acked) + last_ackt = skb->tstamp; } - tp->packets_out -= tcp_skb_pcount(skb); + tp->packets_out -= packets_acked; + + if (!fully_acked) + break; + tcp_unlink_write_queue(skb, sk); sk_stream_free_skb(sk, skb); tcp_clear_all_retrans_hints(tp); @@ -2668,6 +2654,9 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p) tcp_rearm_rto(sk); tp->fackets_out -= min(pkts_acked, tp->fackets_out); + /* hint's skb might be NULL but we don't need to care */ + tp->fastpath_cnt_hint -= min_t(u32, pkts_acked, + tp->fastpath_cnt_hint); if (tcp_is_reno(tp)) tcp_remove_reno_sacks(sk, pkts_acked); -- 2.20.1