[CCID3]: Call sk->sk_write_space(sk) when receiving a feedback packet

This makes the send rate calculations behave way more closely to what
is specified, with the jitter previously seen on x and x_recv
disappearing completely on non lossy setups.

This resembles the tcp_data_snd_check code, that possibly we'll end up
using in DCCP as well, perhaps moving this code to
inet_connection_sock.

For now I'm doing the simplest implementation tho.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/net/dccp/output.c b/net/dccp/output.c
index 116f6db5678d..28de157a4326 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -150,6 +150,19 @@ unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)
         return mss_now;
 }
 
+void dccp_write_space(struct sock *sk)
+{
+        read_lock(&sk->sk_callback_lock);
+
+        if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+                wake_up_interruptible(sk->sk_sleep);
+        /* Should agree with poll, otherwise some programs break */
+        if (sock_writeable(sk))
+                sk_wake_async(sk, 2, POLL_OUT);
+
+        read_unlock(&sk->sk_callback_lock);
+}
+
 /**
  * dccp_wait_for_ccid - Wait for ccid to tell us we can send a packet
  * @sk: socket to wait for