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Diffstat (limited to 'net/ipv4/tcp_output.c')
-rw-r--r--net/ipv4/tcp_output.c46
1 files changed, 26 insertions, 20 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index ec335fabd5c..92fde8d1aa8 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -160,6 +160,7 @@ static void tcp_event_data_sent(struct tcp_sock *tp,
{
struct inet_connection_sock *icsk = inet_csk(sk);
const u32 now = tcp_time_stamp;
+ const struct dst_entry *dst = __sk_dst_get(sk);
if (sysctl_tcp_slow_start_after_idle &&
(!tp->packets_out && (s32)(now - tp->lsndtime) > icsk->icsk_rto))
@@ -170,8 +171,9 @@ static void tcp_event_data_sent(struct tcp_sock *tp,
/* If it is a reply for ato after last received
* packet, enter pingpong mode.
*/
- if ((u32)(now - icsk->icsk_ack.lrcvtime) < icsk->icsk_ack.ato)
- icsk->icsk_ack.pingpong = 1;
+ if ((u32)(now - icsk->icsk_ack.lrcvtime) < icsk->icsk_ack.ato &&
+ (!dst || !dst_metric(dst, RTAX_QUICKACK)))
+ icsk->icsk_ack.pingpong = 1;
}
/* Account for an ACK we sent. */
@@ -181,6 +183,21 @@ static inline void tcp_event_ack_sent(struct sock *sk, unsigned int pkts)
inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);
}
+
+u32 tcp_default_init_rwnd(u32 mss)
+{
+ /* Initial receive window should be twice of TCP_INIT_CWND to
+ * enable proper sending of new unsent data during fast recovery
+ * (RFC 3517, Section 4, NextSeg() rule (2)). Further place a
+ * limit when mss is larger than 1460.
+ */
+ u32 init_rwnd = TCP_INIT_CWND * 2;
+
+ if (mss > 1460)
+ init_rwnd = max((1460 * init_rwnd) / mss, 2U);
+ return init_rwnd;
+}
+
/* Determine a window scaling and initial window to offer.
* Based on the assumption that the given amount of space
* will be offered. Store the results in the tp structure.
@@ -230,22 +247,10 @@ void tcp_select_initial_window(int __space, __u32 mss,
}
}
- /* Set initial window to a value enough for senders starting with
- * initial congestion window of TCP_DEFAULT_INIT_RCVWND. Place
- * a limit on the initial window when mss is larger than 1460.
- */
if (mss > (1 << *rcv_wscale)) {
- int init_cwnd = TCP_DEFAULT_INIT_RCVWND;
- if (mss > 1460)
- init_cwnd =
- max_t(u32, (1460 * TCP_DEFAULT_INIT_RCVWND) / mss, 2);
- /* when initializing use the value from init_rcv_wnd
- * rather than the default from above
- */
- if (init_rcv_wnd)
- *rcv_wnd = min(*rcv_wnd, init_rcv_wnd * mss);
- else
- *rcv_wnd = min(*rcv_wnd, init_cwnd * mss);
+ if (!init_rcv_wnd) /* Use default unless specified otherwise */
+ init_rcv_wnd = tcp_default_init_rwnd(mss);
+ *rcv_wnd = min(*rcv_wnd, init_rcv_wnd * mss);
}
/* Set the clamp no higher than max representable value */
@@ -2402,6 +2407,8 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
* see tcp_input.c tcp_sacktag_write_queue().
*/
TCP_SKB_CB(skb)->ack_seq = tp->snd_nxt;
+ } else {
+ NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPRETRANSFAIL);
}
return err;
}
@@ -2523,10 +2530,9 @@ begin_fwd:
if (sacked & (TCPCB_SACKED_ACKED|TCPCB_SACKED_RETRANS))
continue;
- if (tcp_retransmit_skb(sk, skb)) {
- NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPRETRANSFAIL);
+ if (tcp_retransmit_skb(sk, skb))
return;
- }
+
NET_INC_STATS_BH(sock_net(sk), mib_idx);
if (tcp_in_cwnd_reduction(sk))