diff options
author | Dmitry Torokhov <dtor_core@ameritech.net> | 2006-01-05 22:25:13 -0500 |
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committer | Dmitry Torokhov <dtor_core@ameritech.net> | 2006-01-05 22:25:13 -0500 |
commit | fed8bf19ec20efc0641740b2d10aa589dbd6d1ab (patch) | |
tree | c104a13c7b8cb7f4152b15729dc5aede7c063e91 /net/ipv4/tcp_input.c | |
parent | e7c3aad53dba54d375b632f2a21b680546828dec (diff) | |
parent | 46f25dffbaba48c571d75f5f574f31978287b8d2 (diff) | |
download | blackbird-op-linux-fed8bf19ec20efc0641740b2d10aa589dbd6d1ab.tar.gz blackbird-op-linux-fed8bf19ec20efc0641740b2d10aa589dbd6d1ab.zip |
Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'net/ipv4/tcp_input.c')
-rw-r--r-- | net/ipv4/tcp_input.c | 99 |
1 files changed, 69 insertions, 30 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index bf2e23086bce..0a461232329f 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -115,8 +115,8 @@ int sysctl_tcp_abc = 1; /* Adapt the MSS value used to make delayed ack decision to the * real world. */ -static inline void tcp_measure_rcv_mss(struct sock *sk, - const struct sk_buff *skb) +static void tcp_measure_rcv_mss(struct sock *sk, + const struct sk_buff *skb) { struct inet_connection_sock *icsk = inet_csk(sk); const unsigned int lss = icsk->icsk_ack.last_seg_size; @@ -246,8 +246,8 @@ static int __tcp_grow_window(const struct sock *sk, struct tcp_sock *tp, return 0; } -static inline void tcp_grow_window(struct sock *sk, struct tcp_sock *tp, - struct sk_buff *skb) +static void tcp_grow_window(struct sock *sk, struct tcp_sock *tp, + struct sk_buff *skb) { /* Check #1 */ if (tp->rcv_ssthresh < tp->window_clamp && @@ -341,6 +341,26 @@ static void tcp_clamp_window(struct sock *sk, struct tcp_sock *tp) tp->rcv_ssthresh = min(tp->window_clamp, 2U*tp->advmss); } + +/* Initialize RCV_MSS value. + * RCV_MSS is an our guess about MSS used by the peer. + * We haven't any direct information about the MSS. + * It's better to underestimate the RCV_MSS rather than overestimate. + * Overestimations make us ACKing less frequently than needed. + * Underestimations are more easy to detect and fix by tcp_measure_rcv_mss(). + */ +void tcp_initialize_rcv_mss(struct sock *sk) +{ + struct tcp_sock *tp = tcp_sk(sk); + unsigned int hint = min_t(unsigned int, tp->advmss, tp->mss_cache); + + hint = min(hint, tp->rcv_wnd/2); + hint = min(hint, TCP_MIN_RCVMSS); + hint = max(hint, TCP_MIN_MSS); + + inet_csk(sk)->icsk_ack.rcv_mss = hint; +} + /* Receiver "autotuning" code. * * The algorithm for RTT estimation w/o timestamps is based on @@ -735,6 +755,27 @@ __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst) return min_t(__u32, cwnd, tp->snd_cwnd_clamp); } +/* Set slow start threshold and cwnd not falling to slow start */ +void tcp_enter_cwr(struct sock *sk) +{ + struct tcp_sock *tp = tcp_sk(sk); + + tp->prior_ssthresh = 0; + tp->bytes_acked = 0; + if (inet_csk(sk)->icsk_ca_state < TCP_CA_CWR) { + tp->undo_marker = 0; + tp->snd_ssthresh = inet_csk(sk)->icsk_ca_ops->ssthresh(sk); + tp->snd_cwnd = min(tp->snd_cwnd, + tcp_packets_in_flight(tp) + 1U); + tp->snd_cwnd_cnt = 0; + tp->high_seq = tp->snd_nxt; + tp->snd_cwnd_stamp = tcp_time_stamp; + TCP_ECN_queue_cwr(tp); + + tcp_set_ca_state(sk, TCP_CA_CWR); + } +} + /* Initialize metrics on socket. */ static void tcp_init_metrics(struct sock *sk) @@ -2070,8 +2111,8 @@ static inline void tcp_ack_update_rtt(struct sock *sk, const int flag, tcp_ack_no_tstamp(sk, seq_rtt, flag); } -static inline void tcp_cong_avoid(struct sock *sk, u32 ack, u32 rtt, - u32 in_flight, int good) +static void tcp_cong_avoid(struct sock *sk, u32 ack, u32 rtt, + u32 in_flight, int good) { const struct inet_connection_sock *icsk = inet_csk(sk); icsk->icsk_ca_ops->cong_avoid(sk, ack, rtt, in_flight, good); @@ -2082,7 +2123,7 @@ static inline void tcp_cong_avoid(struct sock *sk, u32 ack, u32 rtt, * RFC2988 recommends to restart timer to now+rto. */ -static inline void tcp_ack_packets_out(struct sock *sk, struct tcp_sock *tp) +static void tcp_ack_packets_out(struct sock *sk, struct tcp_sock *tp) { if (!tp->packets_out) { inet_csk_clear_xmit_timer(sk, ICSK_TIME_RETRANS); @@ -2147,7 +2188,7 @@ static int tcp_tso_acked(struct sock *sk, struct sk_buff *skb, return acked; } -static inline u32 tcp_usrtt(const struct sk_buff *skb) +static u32 tcp_usrtt(const struct sk_buff *skb) { struct timeval tv, now; @@ -2342,7 +2383,7 @@ static int tcp_ack_update_window(struct sock *sk, struct tcp_sock *tp, if (nwin > tp->max_window) { tp->max_window = nwin; - tcp_sync_mss(sk, tp->pmtu_cookie); + tcp_sync_mss(sk, inet_csk(sk)->icsk_pmtu_cookie); } } } @@ -2583,8 +2624,8 @@ void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, /* Fast parse options. This hopes to only see timestamps. * If it is wrong it falls back on tcp_parse_options(). */ -static inline int tcp_fast_parse_options(struct sk_buff *skb, struct tcphdr *th, - struct tcp_sock *tp) +static int tcp_fast_parse_options(struct sk_buff *skb, struct tcphdr *th, + struct tcp_sock *tp) { if (th->doff == sizeof(struct tcphdr)>>2) { tp->rx_opt.saw_tstamp = 0; @@ -2804,8 +2845,7 @@ static void tcp_fin(struct sk_buff *skb, struct sock *sk, struct tcphdr *th) } } -static __inline__ int -tcp_sack_extend(struct tcp_sack_block *sp, u32 seq, u32 end_seq) +static inline int tcp_sack_extend(struct tcp_sack_block *sp, u32 seq, u32 end_seq) { if (!after(seq, sp->end_seq) && !after(sp->start_seq, end_seq)) { if (before(seq, sp->start_seq)) @@ -2817,7 +2857,7 @@ tcp_sack_extend(struct tcp_sack_block *sp, u32 seq, u32 end_seq) return 0; } -static inline void tcp_dsack_set(struct tcp_sock *tp, u32 seq, u32 end_seq) +static void tcp_dsack_set(struct tcp_sock *tp, u32 seq, u32 end_seq) { if (tp->rx_opt.sack_ok && sysctl_tcp_dsack) { if (before(seq, tp->rcv_nxt)) @@ -2832,7 +2872,7 @@ static inline void tcp_dsack_set(struct tcp_sock *tp, u32 seq, u32 end_seq) } } -static inline void tcp_dsack_extend(struct tcp_sock *tp, u32 seq, u32 end_seq) +static void tcp_dsack_extend(struct tcp_sock *tp, u32 seq, u32 end_seq) { if (!tp->rx_opt.dsack) tcp_dsack_set(tp, seq, end_seq); @@ -2890,7 +2930,7 @@ static void tcp_sack_maybe_coalesce(struct tcp_sock *tp) } } -static __inline__ void tcp_sack_swap(struct tcp_sack_block *sack1, struct tcp_sack_block *sack2) +static inline void tcp_sack_swap(struct tcp_sack_block *sack1, struct tcp_sack_block *sack2) { __u32 tmp; @@ -3455,7 +3495,7 @@ void tcp_cwnd_application_limited(struct sock *sk) tp->snd_cwnd_stamp = tcp_time_stamp; } -static inline int tcp_should_expand_sndbuf(struct sock *sk, struct tcp_sock *tp) +static int tcp_should_expand_sndbuf(struct sock *sk, struct tcp_sock *tp) { /* If the user specified a specific send buffer setting, do * not modify it. @@ -3502,7 +3542,7 @@ static void tcp_new_space(struct sock *sk) sk->sk_write_space(sk); } -static inline void tcp_check_space(struct sock *sk) +static void tcp_check_space(struct sock *sk) { if (sock_flag(sk, SOCK_QUEUE_SHRUNK)) { sock_reset_flag(sk, SOCK_QUEUE_SHRUNK); @@ -3512,7 +3552,7 @@ static inline void tcp_check_space(struct sock *sk) } } -static __inline__ void tcp_data_snd_check(struct sock *sk, struct tcp_sock *tp) +static inline void tcp_data_snd_check(struct sock *sk, struct tcp_sock *tp) { tcp_push_pending_frames(sk, tp); tcp_check_space(sk); @@ -3544,7 +3584,7 @@ static void __tcp_ack_snd_check(struct sock *sk, int ofo_possible) } } -static __inline__ void tcp_ack_snd_check(struct sock *sk) +static inline void tcp_ack_snd_check(struct sock *sk) { if (!inet_csk_ack_scheduled(sk)) { /* We sent a data segment already. */ @@ -3692,8 +3732,7 @@ static int __tcp_checksum_complete_user(struct sock *sk, struct sk_buff *skb) return result; } -static __inline__ int -tcp_checksum_complete_user(struct sock *sk, struct sk_buff *skb) +static inline int tcp_checksum_complete_user(struct sock *sk, struct sk_buff *skb) { return skb->ip_summed != CHECKSUM_UNNECESSARY && __tcp_checksum_complete_user(sk, skb); @@ -3967,12 +4006,12 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb, struct tcphdr *th, unsigned len) { struct tcp_sock *tp = tcp_sk(sk); + struct inet_connection_sock *icsk = inet_csk(sk); int saved_clamp = tp->rx_opt.mss_clamp; tcp_parse_options(skb, &tp->rx_opt, 0); if (th->ack) { - struct inet_connection_sock *icsk; /* rfc793: * "If the state is SYN-SENT then * first check the ACK bit @@ -4061,7 +4100,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb, if (tp->rx_opt.sack_ok && sysctl_tcp_fack) tp->rx_opt.sack_ok |= 2; - tcp_sync_mss(sk, tp->pmtu_cookie); + tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); tcp_initialize_rcv_mss(sk); /* Remember, tcp_poll() does not lock socket! @@ -4072,7 +4111,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb, tcp_set_state(sk, TCP_ESTABLISHED); /* Make sure socket is routed, for correct metrics. */ - tp->af_specific->rebuild_header(sk); + icsk->icsk_af_ops->rebuild_header(sk); tcp_init_metrics(sk); @@ -4098,8 +4137,6 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb, sk_wake_async(sk, 0, POLL_OUT); } - icsk = inet_csk(sk); - if (sk->sk_write_pending || icsk->icsk_accept_queue.rskq_defer_accept || icsk->icsk_ack.pingpong) { @@ -4173,7 +4210,7 @@ discard: if (tp->ecn_flags&TCP_ECN_OK) sock_set_flag(sk, SOCK_NO_LARGESEND); - tcp_sync_mss(sk, tp->pmtu_cookie); + tcp_sync_mss(sk, icsk->icsk_pmtu_cookie); tcp_initialize_rcv_mss(sk); @@ -4220,6 +4257,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, struct tcphdr *th, unsigned len) { struct tcp_sock *tp = tcp_sk(sk); + struct inet_connection_sock *icsk = inet_csk(sk); int queued = 0; tp->rx_opt.saw_tstamp = 0; @@ -4236,7 +4274,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, goto discard; if(th->syn) { - if(tp->af_specific->conn_request(sk, skb) < 0) + if (icsk->icsk_af_ops->conn_request(sk, skb) < 0) return 1; /* Now we have several options: In theory there is @@ -4349,7 +4387,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb, /* Make sure socket is routed, for * correct metrics. */ - tp->af_specific->rebuild_header(sk); + icsk->icsk_af_ops->rebuild_header(sk); tcp_init_metrics(sk); @@ -4475,3 +4513,4 @@ EXPORT_SYMBOL(sysctl_tcp_abc); EXPORT_SYMBOL(tcp_parse_options); EXPORT_SYMBOL(tcp_rcv_established); EXPORT_SYMBOL(tcp_rcv_state_process); +EXPORT_SYMBOL(tcp_initialize_rcv_mss); |