netdev - [PATCH] tcp: for tcp westwood implementation

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Date:	Mon, 28 Dec 2009 14:18:33 +0900
From:	"Hwang Jae-Hyun" <jhhwang@...korea.ac.kr>
To:	<netdev@...r.kernel.org>
Subject: [PATCH] tcp: for tcp westwood implementation

From: Jae-Hyun Hwang <jhhwang@...korea.ac.kr>

Current net/ipv4/tcp_westwood.c seems to be unnatural when compared with
Westwood papers.
Since Linux TCP calls '.ssthresh' interface whenever packet loss is
detected,
it is more natural that the interface points to 'tcp_westwood_bw_rttmin'
function, not Reno's function.
This patch also enables Westwood to perform its algorithm when CA_EVENT_LOSS
event is generated as explained in the papers.

Signed-off-by: Jae-Hyun Hwang <jhhwang@...korea.ac.kr>
---

--- linux-2.6.32.2/net/ipv4/tcp_westwood.c.orig 2009-12-28
13:35:42.000000000 +0900
+++ linux-2.6.32.2/net/ipv4/tcp_westwood.c      2009-12-28
13:36:54.000000000 +0900
@@ -232,12 +232,7 @@ static void tcp_westwood_event(struct so
                westwood_fast_bw(sk);
                break;
 
-       case CA_EVENT_COMPLETE_CWR:
-               tp->snd_cwnd = tp->snd_ssthresh =
tcp_westwood_bw_rttmin(sk);
-               break;
-
        case CA_EVENT_FRTO:
-               tp->snd_ssthresh = tcp_westwood_bw_rttmin(sk);
                /* Update RTT_min when next ack arrives */
                w->reset_rtt_min = 1;
                break;
@@ -274,9 +269,8 @@ static void tcp_westwood_info(struct soc
 
 static struct tcp_congestion_ops tcp_westwood = {
        .init           = tcp_westwood_init,
-       .ssthresh       = tcp_reno_ssthresh,
+       .ssthresh       = tcp_westwood_bw_rttmin,
        .cong_avoid     = tcp_reno_cong_avoid,
-       .min_cwnd       = tcp_westwood_bw_rttmin,
        .cwnd_event     = tcp_westwood_event,
        .get_info       = tcp_westwood_info,
        .pkts_acked     = tcp_westwood_pkts_acked,
--

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