[CCID2]: Remove redundant ack-counting variable

The code used two different variables to count Acks, one of them redundant.
This patch reduces the number of Ack counters to one.

The type of the Ack counter has also been changed to u32 (twice the range of int);
and the variable has been renamed into `packets_acked' - for consistency with
RFC 3465 (and similarly named variables are used by TCP and SCTP).

Lastly, a slightly less aggressive `maxincr' increment is used (for even Ack Ratios,
maxincr was Ack Ratio/2 + 1 instead of Ack Ratio/2).

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 4 deletions

diff --git a/net/dccp/ccids/ccid2.h b/net/dccp/ccids/ccid2.h
index 2671f8ebe294..2c94ca029010 100644
--- a/net/dccp/ccids/ccid2.h
+++ b/net/dccp/ccids/ccid2.h
@@ -43,8 +43,7 @@ struct ccid2_seq {
 /** struct ccid2_hc_tx_sock - CCID2 TX half connection
  *
  * @ccid2hctx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
- * @ccid2hctx_ssacks - ACKs recv in slow start
- * @ccid2hctx_acks - ACKS recv in AI phase
+ * @ccid2hctx_packets_acked - Ack counter for deriving cwnd growth (RFC 3465)
  * @ccid2hctx_lastrtt -time RTT was last measured
  * @ccid2hctx_rpseq - last consecutive seqno
  * @ccid2hctx_rpdupack - dupacks since rpseq
@@ -53,8 +52,7 @@ struct ccid2_hc_tx_sock {
         u32                     ccid2hctx_cwnd;
         u32                     ccid2hctx_ssthresh;
         u32                     ccid2hctx_pipe;
-        int                     ccid2hctx_ssacks;
-        int                     ccid2hctx_acks;
+        u32                     ccid2hctx_packets_acked;
         struct ccid2_seq        *ccid2hctx_seqbuf[CCID2_SEQBUF_MAX];
         int                     ccid2hctx_seqbufc;
         struct ccid2_seq        *ccid2hctx_seqh;