diff options
Diffstat (limited to 'include/net/tcp.h')
| -rw-r--r-- | include/net/tcp.h | 156 |
1 files changed, 17 insertions, 139 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index ec9e20c27179..a166918ca56d 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -721,11 +721,16 @@ static inline int tcp_ack_scheduled(struct tcp_sock *tp) return tp->ack.pending&TCP_ACK_SCHED; } -static __inline__ void tcp_dec_quickack_mode(struct tcp_sock *tp) +static __inline__ void tcp_dec_quickack_mode(struct tcp_sock *tp, unsigned int pkts) { - if (tp->ack.quick && --tp->ack.quick == 0) { - /* Leaving quickack mode we deflate ATO. */ - tp->ack.ato = TCP_ATO_MIN; + if (tp->ack.quick) { + if (pkts >= tp->ack.quick) { + tp->ack.quick = 0; + + /* Leaving quickack mode we deflate ATO. */ + tp->ack.ato = TCP_ATO_MIN; + } else + tp->ack.quick -= pkts; } } @@ -843,7 +848,9 @@ extern __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb, /* tcp_output.c */ -extern int tcp_write_xmit(struct sock *, int nonagle); +extern void __tcp_push_pending_frames(struct sock *sk, struct tcp_sock *tp, + unsigned int cur_mss, int nonagle); +extern int tcp_may_send_now(struct sock *sk, struct tcp_sock *tp); extern int tcp_retransmit_skb(struct sock *, struct sk_buff *); extern void tcp_xmit_retransmit_queue(struct sock *); extern void tcp_simple_retransmit(struct sock *); @@ -855,10 +862,13 @@ extern int tcp_write_wakeup(struct sock *); extern void tcp_send_fin(struct sock *sk); extern void tcp_send_active_reset(struct sock *sk, int priority); extern int tcp_send_synack(struct sock *); -extern void tcp_push_one(struct sock *, unsigned mss_now); +extern void tcp_push_one(struct sock *, unsigned int mss_now); extern void tcp_send_ack(struct sock *sk); extern void tcp_send_delayed_ack(struct sock *sk); +/* tcp_input.c */ +extern void tcp_cwnd_application_limited(struct sock *sk); + /* tcp_timer.c */ extern void tcp_init_xmit_timers(struct sock *); extern void tcp_clear_xmit_timers(struct sock *); @@ -958,7 +968,7 @@ static inline void tcp_reset_xmit_timer(struct sock *sk, int what, unsigned long static inline void tcp_initialize_rcv_mss(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); - unsigned int hint = min(tp->advmss, tp->mss_cache_std); + 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); @@ -1225,28 +1235,6 @@ static inline void tcp_sync_left_out(struct tcp_sock *tp) tp->left_out = tp->sacked_out + tp->lost_out; } -extern void tcp_cwnd_application_limited(struct sock *sk); - -/* Congestion window validation. (RFC2861) */ - -static inline void tcp_cwnd_validate(struct sock *sk, struct tcp_sock *tp) -{ - __u32 packets_out = tp->packets_out; - - if (packets_out >= tp->snd_cwnd) { - /* Network is feed fully. */ - tp->snd_cwnd_used = 0; - tp->snd_cwnd_stamp = tcp_time_stamp; - } else { - /* Network starves. */ - if (tp->packets_out > tp->snd_cwnd_used) - tp->snd_cwnd_used = tp->packets_out; - - if ((s32)(tcp_time_stamp - tp->snd_cwnd_stamp) >= tp->rto) - tcp_cwnd_application_limited(sk); - } -} - /* Set slow start threshould and cwnd not falling to slow start */ static inline void __tcp_enter_cwr(struct tcp_sock *tp) { @@ -1279,12 +1267,6 @@ static __inline__ __u32 tcp_max_burst(const struct tcp_sock *tp) return 3; } -static __inline__ int tcp_minshall_check(const struct tcp_sock *tp) -{ - return after(tp->snd_sml,tp->snd_una) && - !after(tp->snd_sml, tp->snd_nxt); -} - static __inline__ void tcp_minshall_update(struct tcp_sock *tp, int mss, const struct sk_buff *skb) { @@ -1292,122 +1274,18 @@ static __inline__ void tcp_minshall_update(struct tcp_sock *tp, int mss, tp->snd_sml = TCP_SKB_CB(skb)->end_seq; } -/* Return 0, if packet can be sent now without violation Nagle's rules: - 1. It is full sized. - 2. Or it contains FIN. - 3. Or TCP_NODELAY was set. - 4. Or TCP_CORK is not set, and all sent packets are ACKed. - With Minshall's modification: all sent small packets are ACKed. - */ - -static __inline__ int -tcp_nagle_check(const struct tcp_sock *tp, const struct sk_buff *skb, - unsigned mss_now, int nonagle) -{ - return (skb->len < mss_now && - !(TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN) && - ((nonagle&TCP_NAGLE_CORK) || - (!nonagle && - tp->packets_out && - tcp_minshall_check(tp)))); -} - -extern void tcp_set_skb_tso_segs(struct sock *, struct sk_buff *); - -/* This checks if the data bearing packet SKB (usually sk->sk_send_head) - * should be put on the wire right now. - */ -static __inline__ int tcp_snd_test(struct sock *sk, - struct sk_buff *skb, - unsigned cur_mss, int nonagle) -{ - struct tcp_sock *tp = tcp_sk(sk); - int pkts = tcp_skb_pcount(skb); - - if (!pkts) { - tcp_set_skb_tso_segs(sk, skb); - pkts = tcp_skb_pcount(skb); - } - - /* RFC 1122 - section 4.2.3.4 - * - * We must queue if - * - * a) The right edge of this frame exceeds the window - * b) There are packets in flight and we have a small segment - * [SWS avoidance and Nagle algorithm] - * (part of SWS is done on packetization) - * Minshall version sounds: there are no _small_ - * segments in flight. (tcp_nagle_check) - * c) We have too many packets 'in flight' - * - * Don't use the nagle rule for urgent data (or - * for the final FIN -DaveM). - * - * Also, Nagle rule does not apply to frames, which - * sit in the middle of queue (they have no chances - * to get new data) and if room at tail of skb is - * not enough to save something seriously (<32 for now). - */ - - /* Don't be strict about the congestion window for the - * final FIN frame. -DaveM - */ - return (((nonagle&TCP_NAGLE_PUSH) || tp->urg_mode - || !tcp_nagle_check(tp, skb, cur_mss, nonagle)) && - (((tcp_packets_in_flight(tp) + (pkts-1)) < tp->snd_cwnd) || - (TCP_SKB_CB(skb)->flags & TCPCB_FLAG_FIN)) && - !after(TCP_SKB_CB(skb)->end_seq, tp->snd_una + tp->snd_wnd)); -} - static __inline__ void tcp_check_probe_timer(struct sock *sk, struct tcp_sock *tp) { if (!tp->packets_out && !tp->pending) tcp_reset_xmit_timer(sk, TCP_TIME_PROBE0, tp->rto); } -static __inline__ int tcp_skb_is_last(const struct sock *sk, - const struct sk_buff *skb) -{ - return skb->next == (struct sk_buff *)&sk->sk_write_queue; -} - -/* Push out any pending frames which were held back due to - * TCP_CORK or attempt at coalescing tiny packets. - * The socket must be locked by the caller. - */ -static __inline__ void __tcp_push_pending_frames(struct sock *sk, - struct tcp_sock *tp, - unsigned cur_mss, - int nonagle) -{ - struct sk_buff *skb = sk->sk_send_head; - - if (skb) { - if (!tcp_skb_is_last(sk, skb)) - nonagle = TCP_NAGLE_PUSH; - if (!tcp_snd_test(sk, skb, cur_mss, nonagle) || - tcp_write_xmit(sk, nonagle)) - tcp_check_probe_timer(sk, tp); - } - tcp_cwnd_validate(sk, tp); -} - static __inline__ void tcp_push_pending_frames(struct sock *sk, struct tcp_sock *tp) { __tcp_push_pending_frames(sk, tp, tcp_current_mss(sk, 1), tp->nonagle); } -static __inline__ int tcp_may_send_now(struct sock *sk, struct tcp_sock *tp) -{ - struct sk_buff *skb = sk->sk_send_head; - - return (skb && - tcp_snd_test(sk, skb, tcp_current_mss(sk, 1), - tcp_skb_is_last(sk, skb) ? TCP_NAGLE_PUSH : tp->nonagle)); -} - static __inline__ void tcp_init_wl(struct tcp_sock *tp, u32 ack, u32 seq) { tp->snd_wl1 = seq; |