[DCCP] CCID2: Halve cwnd once upon multiple losses in a single RTT

When multiple losses occur in one RTT, the window should be halved
only once [a single "congestion event"].  This is now implemented,
although not perfectly.  Slightly changed the interface for changing
the cwnd: pass hctx instead of dp.  This is required in order to allow
for change_cwnd to be called from _init().

Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/dccp/ccids/ccid2.h b/net/dccp/ccids/ccid2.h
index 2a02ce04ba85..5b2ef4acb300 100644
--- a/net/dccp/ccids/ccid2.h
+++ b/net/dccp/ccids/ccid2.h
@@ -71,6 +71,7 @@ struct ccid2_hc_tx_sock {
         u64                     ccid2hctx_rpseq;
         int                     ccid2hctx_rpdupack;
         int                     ccid2hctx_sendwait;
+        unsigned long           ccid2hctx_last_cong;
 };
 
 struct ccid2_hc_rx_sock {