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[CCID2]: Replace cwnd assignment-function with assignment

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The current function ccid2_change_cwnd in effect makes only an assignment, as
the test whether cwnd has reached 0 is only required when cwnd is halved.

This patch simplifies the code by replacing the function with the assignment
it performs.

Furthermore, since ssthresh derives from cwnd and appears in many assignments and
comparisons, the type of ssthresh has also been changed to match that of cwnd.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-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>
This commit is contained in:
Gerrit Renker 2007-11-24 22:05:51 -02:00 committed by David S. Miller
parent 63df18ad7f
commit 3deeadd74b
2 changed files with 8 additions and 16 deletions
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22
net/dccp/ccids/ccid2.c
View file

@ -165,12 +165,6 @@ static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val)
dp->dccps_l_ack_ratio = val;
}
static void ccid2_change_cwnd(struct ccid2_hc_tx_sock *hctx, u32 val)
{
hctx->ccid2hctx_cwnd = val? : 1;
ccid2_pr_debug("changed cwnd to %u\n", hctx->ccid2hctx_cwnd);
}
static void ccid2_change_srtt(struct ccid2_hc_tx_sock *hctx, long val)
{
ccid2_pr_debug("change SRTT to %ld\n", val);
@ -212,10 +206,10 @@ static void ccid2_hc_tx_rto_expire(unsigned long data)
/* adjust pipe, cwnd etc */
ccid2_change_pipe(hctx, 0);
hctx->ccid2hctx_ssthresh = hctx->ccid2hctx_cwnd >> 1;
hctx->ccid2hctx_ssthresh = hctx->ccid2hctx_cwnd / 2;
if (hctx->ccid2hctx_ssthresh < 2)
hctx->ccid2hctx_ssthresh = 2;
ccid2_change_cwnd(hctx, 1);
hctx->ccid2hctx_cwnd = 1;
/* clear state about stuff we sent */
hctx->ccid2hctx_seqt = hctx->ccid2hctx_seqh;
@ -440,7 +434,7 @@ static inline void ccid2_new_ack(struct sock *sk,
/* increase every 2 acks */
hctx->ccid2hctx_ssacks++;
if (hctx->ccid2hctx_ssacks == 2) {
ccid2_change_cwnd(hctx, hctx->ccid2hctx_cwnd+1);
hctx->ccid2hctx_cwnd++;
hctx->ccid2hctx_ssacks = 0;
*maxincr = *maxincr - 1;
}
@ -453,7 +447,7 @@ static inline void ccid2_new_ack(struct sock *sk,
hctx->ccid2hctx_acks++;
if (hctx->ccid2hctx_acks >= hctx->ccid2hctx_cwnd) {
ccid2_change_cwnd(hctx, hctx->ccid2hctx_cwnd + 1);
hctx->ccid2hctx_cwnd++;
hctx->ccid2hctx_acks = 0;
}
}
@ -543,10 +537,8 @@ static void ccid2_congestion_event(struct sock *sk, struct ccid2_seq *seqp)
hctx->ccid2hctx_last_cong = jiffies;
ccid2_change_cwnd(hctx, hctx->ccid2hctx_cwnd >> 1);
hctx->ccid2hctx_ssthresh = hctx->ccid2hctx_cwnd;
if (hctx->ccid2hctx_ssthresh < 2)
hctx->ccid2hctx_ssthresh = 2;
hctx->ccid2hctx_cwnd = hctx->ccid2hctx_cwnd / 2 ? : 1U;
hctx->ccid2hctx_ssthresh = max(hctx->ccid2hctx_cwnd, 2U);
/* Avoid spurious timeouts resulting from Ack Ratio > cwnd */
if (dccp_sk(sk)->dccps_l_ack_ratio > hctx->ccid2hctx_cwnd)
@ -759,7 +751,7 @@ static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
u32 max_ratio;
/* RFC 4341, 5: initialise ssthresh to arbitrarily high (max) value */
hctx->ccid2hctx_ssthresh = ~0;
hctx->ccid2hctx_ssthresh = ~0U;
/*
* RFC 4341, 5: "The cwnd parameter is initialized to at most four

2
net/dccp/ccids/ccid2.h
View file

@ -50,9 +50,9 @@ struct ccid2_seq {
*/
struct ccid2_hc_tx_sock {
u32 ccid2hctx_cwnd;
u32 ccid2hctx_ssthresh;
int ccid2hctx_ssacks;
int ccid2hctx_acks;
unsigned int ccid2hctx_ssthresh;
int ccid2hctx_pipe;
struct ccid2_seq *ccid2hctx_seqbuf[CCID2_SEQBUF_MAX];
int ccid2hctx_seqbufc;