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[CCID3]: Use a function to update p_inv, and p is never used

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This patch
 1) concentrates previously scattered computation of p_inv into one function;
 2) removes the `p' element of the CCID3 RX sock (it is redundant);
 3) makes the tfrc_rx_info structure standalone, only used on demand.

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 2007-12-17 10:07:44 -02:00 committed by David S. Miller
parent 17159b0b49
commit 8e138e7949
2 changed files with 12 additions and 7 deletions
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11
net/dccp/ccids/ccid3.c
View file

@ -917,6 +917,7 @@ static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
u32 __user *optval, int __user *optlen)
{
const struct ccid3_hc_rx_sock *hcrx;
struct tfrc_rx_info rx_info;
const void *val;
/* Listen socks doesn't have a private CCID block */
@ -926,10 +927,14 @@ static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
hcrx = ccid3_hc_rx_sk(sk);
switch (optname) {
case DCCP_SOCKOPT_CCID_RX_INFO:
if (len < sizeof(hcrx->ccid3hcrx_tfrc))
if (len < sizeof(rx_info))
return -EINVAL;
len = sizeof(hcrx->ccid3hcrx_tfrc);
val = &hcrx->ccid3hcrx_tfrc;
rx_info.tfrcrx_x_recv = hcrx->ccid3hcrx_x_recv;
rx_info.tfrcrx_rtt = hcrx->ccid3hcrx_rtt;
rx_info.tfrcrx_p = hcrx->ccid3hcrx_pinv == 0 ? ~0U :
scaled_div(1, hcrx->ccid3hcrx_pinv);
len = sizeof(rx_info);
val = &rx_info;
break;
default:
return -ENOPROTOOPT;

8
net/dccp/ccids/ccid3.h
View file

@ -139,6 +139,8 @@ enum ccid3_hc_rx_states {
* @ccid3hcrx_last_counter - Tracks window counter (RFC 4342, 8.1)
* @ccid3hcrx_state - Receiver state, one of %ccid3_hc_rx_states
* @ccid3hcrx_bytes_recv - Total sum of DCCP payload bytes
* @ccid3hcrx_x_recv - Receiver estimate of send rate (RFC 3448, sec. 4.3)
* @ccid3hcrx_rtt - Receiver estimate of RTT
* @ccid3hcrx_tstamp_last_feedback - Time at which last feedback was sent
* @ccid3hcrx_tstamp_last_ack - Time at which last feedback was sent
* @ccid3hcrx_hist - Packet history (loss detection + RTT sampling)
@ -147,13 +149,11 @@ enum ccid3_hc_rx_states {
* @ccid3hcrx_pinv - Inverse of Loss Event Rate (RFC 4342, sec. 8.5)
*/
struct ccid3_hc_rx_sock {
struct tfrc_rx_info ccid3hcrx_tfrc;
#define ccid3hcrx_x_recv ccid3hcrx_tfrc.tfrcrx_x_recv
#define ccid3hcrx_rtt ccid3hcrx_tfrc.tfrcrx_rtt
#define ccid3hcrx_p ccid3hcrx_tfrc.tfrcrx_p
u8 ccid3hcrx_last_counter:4;
enum ccid3_hc_rx_states ccid3hcrx_state:8;
u32 ccid3hcrx_bytes_recv;
u32 ccid3hcrx_x_recv;
u32 ccid3hcrx_rtt;
ktime_t ccid3hcrx_tstamp_last_feedback;
struct tfrc_rx_hist ccid3hcrx_hist;
struct tfrc_loss_hist ccid3hcrx_li_hist;