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[DCCP] CCID2: Add helper functions for changing important CCID2 state

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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>
This commit is contained in:
Andrea Bittau 2006-09-19 13:15:33 -07:00 committed by David S. Miller
parent 374bcf32c8
commit 593f16aa62
1 changed files with 23 additions and 8 deletions
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31
net/dccp/ccids/ccid2.c
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@ -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;