tcp: properly send new data in fast recovery in first RTT

Linux sends new unset data during disorder and recovery state if all
(suspected) lost packets have been retransmitted ( RFC5681, section
3.2 step 1 & 2, RFC3517 section 4, NexSeg() Rule 2).  One requirement
is to keep the receive window about twice the estimated sender's
congestion window (tcp_rcv_space_adjust()), assuming the fast
retransmits repair the losses in the next round trip.

But currently it's not the case on the first round trip in either
normal or Fast Open connection, beucase the initial receive window
is identical to (expected) sender's initial congestion window. The
fix is to double it.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 15 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index ec335fabd5cc..3dd46eab3b05 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -181,6 +181,21 @@ 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 unset 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 +245,10 @@ 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 */