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Date: Sat, 26 May 2007 11:35:56 +0300 From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> To: netdev@...r.kernel.org Cc: David Miller <davem@...emloft.net>, "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> Subject: [PATCH 3/9] [TCP]: Tighten tcp_sock's belt, drop left_out From: =?ISO-8859-1?q?Ilpo_J=E4rvinen?= <ilpo.jarvinen@...sinki.fi> It is easily calculable when needed and user are not that many after all. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi> --- include/linux/tcp.h | 1 - include/net/tcp.h | 4 ++-- net/ipv4/tcp_input.c | 11 ++--------- net/ipv4/tcp_minisocks.c | 1 - net/ipv4/tcp_output.c | 12 +++--------- 5 files changed, 7 insertions(+), 22 deletions(-) diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 728321f..63e04f4 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -305,7 +305,6 @@ struct tcp_sock { u32 rtt_seq; /* sequence number to update rttvar */ u32 packets_out; /* Packets which are "in flight" */ - u32 left_out; /* Packets which leaved network */ u32 retrans_out; /* Retransmitted packets out */ /* * Options received (usually on last packet, some only on SYN packets). diff --git a/include/net/tcp.h b/include/net/tcp.h index dd58cf2..5d866a4 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -716,7 +716,8 @@ static inline void tcp_ca_event(struct sock *sk, const enum tcp_ca_event event) */ static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp) { - return (tp->packets_out - tp->left_out + tp->retrans_out); + return tp->packets_out - (tp->sacked_out + tp->lost_out) + + tp->retrans_out; } /* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd. @@ -738,7 +739,6 @@ static inline void tcp_sync_left_out(struct tcp_sock *tp) { BUG_ON(tp->rx_opt.sack_ok && (tp->sacked_out + tp->lost_out > tp->packets_out)); - tp->left_out = tp->sacked_out + tp->lost_out; } extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh); diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 4dab5d7..c17e077 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -1301,8 +1301,6 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, } } - tp->left_out = tp->sacked_out + tp->lost_out; - if ((state.reord < tp->fackets_out) && icsk->icsk_ca_state != TCP_CA_Loss && (!tp->frto_highmark || after(tp->snd_una, tp->frto_highmark))) tcp_update_reordering(sk, ((tp->fackets_out + 1) - state.reord), 0); @@ -1363,7 +1361,6 @@ static void tcp_remove_reno_sacks(struct sock *sk, int acked) static inline void tcp_reset_reno_sack(struct tcp_sock *tp) { tp->sacked_out = 0; - tp->left_out = tp->lost_out; } int tcp_use_frto(struct sock *sk) @@ -1526,7 +1523,6 @@ static void tcp_enter_frto_loss(struct sock *sk, int allowed_segments, int flag) void tcp_clear_retrans(struct tcp_sock *tp) { - tp->left_out = 0; tp->retrans_out = 0; tp->fackets_out = 0; @@ -2023,7 +2019,7 @@ static void DBGUNDO(struct sock *sk, const char *msg) printk(KERN_DEBUG "Undo %s %u.%u.%u.%u/%u c%u l%u ss%u/%u p%u\n", msg, NIPQUAD(inet->daddr), ntohs(inet->dport), - tp->snd_cwnd, tp->left_out, + tp->snd_cwnd, tp->sacked_out + tp->lost_out, tp->snd_ssthresh, tp->prior_ssthresh, tp->packets_out); } @@ -2152,7 +2148,6 @@ static int tcp_try_undo_loss(struct sock *sk) DBGUNDO(sk, "partial loss"); tp->lost_out = 0; - tp->left_out = tp->sacked_out; tcp_undo_cwr(sk, 1); NET_INC_STATS_BH(LINUX_MIB_TCPLOSSUNDO); inet_csk(sk)->icsk_retransmits = 0; @@ -2176,8 +2171,6 @@ static void tcp_try_to_open(struct sock *sk, int flag) { struct tcp_sock *tp = tcp_sk(sk); - tp->left_out = tp->sacked_out; - if (tp->retrans_out == 0) tp->retrans_stamp = 0; @@ -2187,7 +2180,7 @@ static void tcp_try_to_open(struct sock *sk, int flag) if (inet_csk(sk)->icsk_ca_state != TCP_CA_CWR) { int state = TCP_CA_Open; - if (tp->left_out || tp->retrans_out || tp->undo_marker) + if (tp->sacked_out || tp->retrans_out || tp->undo_marker) state = TCP_CA_Disorder; if (inet_csk(sk)->icsk_ca_state != state) { diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index 42588eb..598ddec 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -399,7 +399,6 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req, newicsk->icsk_rto = TCP_TIMEOUT_INIT; newtp->packets_out = 0; - newtp->left_out = 0; newtp->retrans_out = 0; newtp->sacked_out = 0; newtp->fackets_out = 0; diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 8891775..d67fb3d 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -682,10 +682,8 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) tp->retrans_out -= diff; - if (TCP_SKB_CB(skb)->sacked & TCPCB_LOST) { + if (TCP_SKB_CB(skb)->sacked & TCPCB_LOST) tp->lost_out -= diff; - tp->left_out -= diff; - } if (diff > 0) { /* Adjust Reno SACK estimate. */ @@ -1675,15 +1673,11 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb, int m TCP_SKB_CB(skb)->sacked |= TCP_SKB_CB(next_skb)->sacked&(TCPCB_EVER_RETRANS|TCPCB_AT_TAIL); if (TCP_SKB_CB(next_skb)->sacked&TCPCB_SACKED_RETRANS) tp->retrans_out -= tcp_skb_pcount(next_skb); - if (TCP_SKB_CB(next_skb)->sacked&TCPCB_LOST) { + if (TCP_SKB_CB(next_skb)->sacked&TCPCB_LOST) tp->lost_out -= tcp_skb_pcount(next_skb); - tp->left_out -= tcp_skb_pcount(next_skb); - } /* Reno case is special. Sigh... */ - if (!tp->rx_opt.sack_ok && tp->sacked_out) { + if (!tp->rx_opt.sack_ok && tp->sacked_out) tcp_dec_pcount_approx(&tp->sacked_out, next_skb); - tp->left_out -= tcp_skb_pcount(next_skb); - } /* Not quite right: it can be > snd.fack, but * it is better to underestimate fackets. -- 1.5.0.6 - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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