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authorAndrea Bittau <a.bittau@cs.ucl.ac.uk>2006-09-19 13:15:33 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-09-22 15:19:42 -0700
commit593f16aa627d61da447c76ee5a159450174627f6 (patch)
treebad929ddf4eae76009c86e96e06cf31d1cd36a18 /net
parent374bcf32c86e1b56eab832bbb6b21e636707eab6 (diff)
downloadop-kernel-dev-593f16aa627d61da447c76ee5a159450174627f6.zip
op-kernel-dev-593f16aa627d61da447c76ee5a159450174627f6.tar.gz
[DCCP] CCID2: Add helper functions for changing important CCID2 state
Introduce methods which manipulate interesting congestion control state such as pipe and rtt estimate. This is useful for people wishing to monitor the variables of CCID and instrument the code [perhaps using Kprobes]. Personally, I am a fan of encapsulation---that justifies this change =D. 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>
Diffstat (limited to 'net')
-rw-r--r--net/dccp/ccids/ccid2.c31
1 files changed, 23 insertions, 8 deletions
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index b88da03..457dd3d 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -199,6 +199,17 @@ static void ccid2_change_cwnd(struct ccid2_hc_tx_sock *hctx, int val)
hctx->ccid2hctx_cwnd = val;
}
+static void ccid2_change_srtt(struct ccid2_hc_tx_sock *hctx, long val)
+{
+ ccid2_pr_debug("change SRTT to %ld\n", val);
+ hctx->ccid2hctx_srtt = val;
+}
+
+static void ccid2_change_pipe(struct ccid2_hc_tx_sock *hctx, long val)
+{
+ hctx->ccid2hctx_pipe = val;
+}
+
static void ccid2_start_rto_timer(struct sock *sk);
static void ccid2_hc_tx_rto_expire(unsigned long data)
@@ -228,7 +239,7 @@ static void ccid2_hc_tx_rto_expire(unsigned long data)
ccid2_start_rto_timer(sk);
/* adjust pipe, cwnd etc */
- hctx->ccid2hctx_pipe = 0;
+ ccid2_change_pipe(hctx, 0);
hctx->ccid2hctx_ssthresh = hctx->ccid2hctx_cwnd >> 1;
if (hctx->ccid2hctx_ssthresh < 2)
hctx->ccid2hctx_ssthresh = 2;
@@ -274,7 +285,7 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, int len)
BUG_ON(!hctx->ccid2hctx_sendwait);
hctx->ccid2hctx_sendwait = 0;
- hctx->ccid2hctx_pipe++;
+ ccid2_change_pipe(hctx, hctx->ccid2hctx_pipe + 1);
BUG_ON(hctx->ccid2hctx_pipe < 0);
/* There is an issue. What if another packet is sent between
@@ -470,11 +481,13 @@ static inline void ccid2_new_ack(struct sock *sk,
if (hctx->ccid2hctx_srtt == -1) {
ccid2_pr_debug("R: %lu Time=%lu seq=%llu\n",
r, jiffies, seqp->ccid2s_seq);
- hctx->ccid2hctx_srtt = r;
+ ccid2_change_srtt(hctx, r);
hctx->ccid2hctx_rttvar = r >> 1;
} else {
/* RTTVAR */
long tmp = hctx->ccid2hctx_srtt - r;
+ long srtt;
+
if (tmp < 0)
tmp *= -1;
@@ -484,10 +497,12 @@ static inline void ccid2_new_ack(struct sock *sk,
hctx->ccid2hctx_rttvar += tmp;
/* SRTT */
- hctx->ccid2hctx_srtt *= 7;
- hctx->ccid2hctx_srtt >>= 3;
+ srtt = hctx->ccid2hctx_srtt;
+ srtt *= 7;
+ srtt >>= 3;
tmp = r >> 3;
- hctx->ccid2hctx_srtt += tmp;
+ srtt += tmp;
+ ccid2_change_srtt(hctx, srtt);
}
s = hctx->ccid2hctx_rttvar << 2;
/* clock granularity is 1 when based on jiffies */
@@ -523,7 +538,7 @@ static void ccid2_hc_tx_dec_pipe(struct sock *sk)
{
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
- hctx->ccid2hctx_pipe--;
+ ccid2_change_pipe(hctx, hctx->ccid2hctx_pipe-1);
BUG_ON(hctx->ccid2hctx_pipe < 0);
if (hctx->ccid2hctx_pipe == 0)
@@ -749,7 +764,7 @@ static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
hctx->ccid2hctx_sent = 0;
hctx->ccid2hctx_rto = 3 * HZ;
- hctx->ccid2hctx_srtt = -1;
+ ccid2_change_srtt(hctx, -1);
hctx->ccid2hctx_rttvar = -1;
hctx->ccid2hctx_lastrtt = 0;
hctx->ccid2hctx_rpdupack = -1;
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