diff options
Diffstat (limited to 'net/ipv4/tcp_output.c')
| -rw-r--r-- | net/ipv4/tcp_output.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index ed750f9ceb0..d29ef79c00c 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -255,7 +255,7 @@ static u16 tcp_select_window(struct sock *sk) * * Relax Will Robinson. */ - new_win = cur_win; + new_win = ALIGN(cur_win, 1 << tp->rx_opt.rcv_wscale); } tp->rcv_wnd = new_win; tp->rcv_wup = tp->rcv_nxt; @@ -1035,6 +1035,13 @@ static void tcp_cwnd_validate(struct sock *sk) * introducing MSS oddities to segment boundaries. In rare cases where * mss_now != mss_cache, we will request caller to create a small skb * per input skb which could be mostly avoided here (if desired). + * + * We explicitly want to create a request for splitting write queue tail + * to a small skb for Nagle purposes while avoiding unnecessary modulos, + * thus all the complexity (cwnd_len is always MSS multiple which we + * return whenever allowed by the other factors). Basically we need the + * modulo only when the receiver window alone is the limiting factor or + * when we would be allowed to send the split-due-to-Nagle skb fully. */ static unsigned int tcp_mss_split_point(struct sock *sk, struct sk_buff *skb, unsigned int mss_now, unsigned int cwnd) @@ -1048,10 +1055,11 @@ static unsigned int tcp_mss_split_point(struct sock *sk, struct sk_buff *skb, if (likely(cwnd_len <= window && skb != tcp_write_queue_tail(sk))) return cwnd_len; - if (skb == tcp_write_queue_tail(sk) && cwnd_len <= skb->len) + needed = min(skb->len, window); + + if (skb == tcp_write_queue_tail(sk) && cwnd_len <= needed) return cwnd_len; - needed = min(skb->len, window); return needed - needed % mss_now; } @@ -1800,6 +1808,9 @@ void tcp_simple_retransmit(struct sock *sk) if (!lost) return; + if (tcp_is_reno(tp)) + tcp_limit_reno_sacked(tp); + tcp_verify_left_out(tp); /* Don't muck with the congestion window here. |