diff options
| -rw-r--r-- | include/net/tcp.h | 6 | ||||
| -rw-r--r-- | net/ipv4/tcp_input.c | 3 | ||||
| -rw-r--r-- | net/ipv4/tcp_output.c | 20 |
3 files changed, 17 insertions, 12 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 76286e80205..6a732d4919f 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -785,6 +785,12 @@ static __inline__ __u32 tcp_max_burst(const struct tcp_sock *tp) return 3; } +/* Returns end sequence number of the receiver's advertised window */ +static inline u32 tcp_wnd_end(const struct tcp_sock *tp) +{ + return tp->snd_una + tp->snd_wnd; +} + /* RFC2861 Check whether we are limited by application or congestion window * This is the inverse of cwnd check in tcp_tso_should_defer */ diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 41f4b862319..366f63ae4d5 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -2921,8 +2921,7 @@ static void tcp_ack_probe(struct sock *sk) /* Was it a usable window open? */ - if (!after(TCP_SKB_CB(tcp_send_head(sk))->end_seq, - tp->snd_una + tp->snd_wnd)) { + if (!after(TCP_SKB_CB(tcp_send_head(sk))->end_seq, tcp_wnd_end(tp))) { icsk->icsk_backoff = 0; inet_csk_clear_xmit_timer(sk, ICSK_TIME_PROBE0); /* Socket must be waked up by subsequent tcp_data_snd_check(). diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 1ca638b8316..821fae27142 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -89,10 +89,10 @@ static inline __u32 tcp_acceptable_seq(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); - if (!before(tp->snd_una+tp->snd_wnd, tp->snd_nxt)) + if (!before(tcp_wnd_end(tp), tp->snd_nxt)) return tp->snd_nxt; else - return tp->snd_una+tp->snd_wnd; + return tcp_wnd_end(tp); } /* Calculate mss to advertise in SYN segment. @@ -1024,7 +1024,7 @@ static unsigned int tcp_mss_split_point(struct sock *sk, struct sk_buff *skb, struct tcp_sock *tp = tcp_sk(sk); u32 needed, window, cwnd_len; - window = (tp->snd_una + tp->snd_wnd - TCP_SKB_CB(skb)->seq); + window = tcp_wnd_end(tp) - TCP_SKB_CB(skb)->seq; cwnd_len = mss_now * cwnd; if (likely(cwnd_len <= window && skb != tcp_write_queue_tail(sk))) @@ -1134,7 +1134,7 @@ static inline int tcp_snd_wnd_test(struct tcp_sock *tp, struct sk_buff *skb, uns if (skb->len > cur_mss) end_seq = TCP_SKB_CB(skb)->seq + cur_mss; - return !after(end_seq, tp->snd_una + tp->snd_wnd); + return !after(end_seq, tcp_wnd_end(tp)); } /* This checks if the data bearing packet SKB (usually tcp_send_head(sk)) @@ -1251,7 +1251,7 @@ static int tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb) BUG_ON(tcp_skb_pcount(skb) <= 1 || (tp->snd_cwnd <= in_flight)); - send_win = (tp->snd_una + tp->snd_wnd) - TCP_SKB_CB(skb)->seq; + send_win = tcp_wnd_end(tp) - TCP_SKB_CB(skb)->seq; /* From in_flight test above, we know that cwnd > in_flight. */ cong_win = (tp->snd_cwnd - in_flight) * tp->mss_cache; @@ -1332,7 +1332,7 @@ static int tcp_mtu_probe(struct sock *sk) if (tp->snd_wnd < size_needed) return -1; - if (after(tp->snd_nxt + size_needed, tp->snd_una + tp->snd_wnd)) + if (after(tp->snd_nxt + size_needed, tcp_wnd_end(tp))) return 0; /* Do we need to wait to drain cwnd? With none in flight, don't stall */ @@ -1687,7 +1687,7 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb, int m return; /* Next skb is out of window. */ - if (after(TCP_SKB_CB(next_skb)->end_seq, tp->snd_una+tp->snd_wnd)) + if (after(TCP_SKB_CB(next_skb)->end_seq, tcp_wnd_end(tp))) return; /* Punt if not enough space exists in the first SKB for @@ -1831,7 +1831,7 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb) * case, when window is shrunk to zero. In this case * our retransmit serves as a zero window probe. */ - if (!before(TCP_SKB_CB(skb)->seq, tp->snd_una+tp->snd_wnd) + if (!before(TCP_SKB_CB(skb)->seq, tcp_wnd_end(tp)) && TCP_SKB_CB(skb)->seq != tp->snd_una) return -EAGAIN; @@ -2497,10 +2497,10 @@ int tcp_write_wakeup(struct sock *sk) struct sk_buff *skb; if ((skb = tcp_send_head(sk)) != NULL && - before(TCP_SKB_CB(skb)->seq, tp->snd_una+tp->snd_wnd)) { + before(TCP_SKB_CB(skb)->seq, tcp_wnd_end(tp))) { int err; unsigned int mss = tcp_current_mss(sk, 0); - unsigned int seg_size = tp->snd_una+tp->snd_wnd-TCP_SKB_CB(skb)->seq; + unsigned int seg_size = tcp_wnd_end(tp) - TCP_SKB_CB(skb)->seq; if (before(tp->pushed_seq, TCP_SKB_CB(skb)->end_seq)) tp->pushed_seq = TCP_SKB_CB(skb)->end_seq; |