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[CCID3]: Use function for RTT sampling

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This replaces the existing occurrences of RTT sampling with
the use of the new function dccp_sample_rtt.

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 2007-03-20 15:24:37 -03:00 committed by David S. Miller
parent 4712a792ee
commit 7dfee1a9c0
2 changed files with 11 additions and 41 deletions
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42
net/dccp/ccids/ccid3.c
View File

@ -414,8 +414,7 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
struct dccp_tx_hist_entry *packet;
struct timeval now;
unsigned long t_nfb;
u32 pinv;
suseconds_t r_sample, t_elapsed;
u32 pinv, r_sample;
BUG_ON(hctx == NULL);
@ -457,18 +456,10 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
* Calculate new round trip sample as per [RFC 3448, 4.3] by
* R_sample = (now - t_recvdata) - t_elapsed
*/
r_sample = timeval_delta(&now, &packet->dccphtx_tstamp);
t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10;
r_sample = dccp_sample_rtt(sk, &now, &packet->dccphtx_tstamp);
DCCP_BUG_ON(r_sample < 0);
if (unlikely(r_sample <= t_elapsed))
DCCP_WARN("WARNING: r_sample=%dus <= t_elapsed=%dus\n",
(int)r_sample, (int)t_elapsed);
else
r_sample -= t_elapsed;
CCID3_RTT_SANITY_CHECK(r_sample);
/* Update RTT estimate by
/*
* Update RTT estimate by
* If (No feedback recv)
* R = R_sample;
* Else
@ -487,15 +478,15 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
ccid3_update_send_interval(hctx);
ccid3_pr_debug("%s(%p), s=%u, MSS=%u, "
"R_sample=%dus, X=%u\n", dccp_role(sk),
"R_sample=%uus, X=%u\n", dccp_role(sk),
sk, hctx->ccid3hctx_s,
dp->dccps_mss_cache, (int)r_sample,
dp->dccps_mss_cache, r_sample,
(unsigned)(hctx->ccid3hctx_x >> 6));
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
} else {
hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt +
(u32)r_sample) / 10;
r_sample) / 10;
/* Update sending rate (step 4 of [RFC 3448, 4.3]) */
if (hctx->ccid3hctx_p > 0)
@ -505,10 +496,10 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
hctx->ccid3hctx_p);
ccid3_hc_tx_update_x(sk, &now);
ccid3_pr_debug("%s(%p), RTT=%uus (sample=%dus), s=%u, "
ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, "
"p=%u, X_calc=%u, X_recv=%u, X=%u\n",
dccp_role(sk),
sk, hctx->ccid3hctx_rtt, (int)r_sample,
sk, hctx->ccid3hctx_rtt, r_sample,
hctx->ccid3hctx_s, hctx->ccid3hctx_p,
hctx->ccid3hctx_x_calc,
(unsigned)(hctx->ccid3hctx_x_recv >> 6),
@ -1025,8 +1016,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
const struct dccp_options_received *opt_recv;
struct dccp_rx_hist_entry *packet;
struct timeval now;
u32 p_prev, rtt_prev;
suseconds_t r_sample, t_elapsed;
u32 p_prev, r_sample, rtt_prev;
int loss, payload_size;
BUG_ON(hcrx == NULL);
@ -1042,17 +1032,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
break;
rtt_prev = hcrx->ccid3hcrx_rtt;
dccp_timestamp(sk, &now);
timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10);
r_sample = timeval_usecs(&now);
t_elapsed = opt_recv->dccpor_elapsed_time * 10;
DCCP_BUG_ON(r_sample < 0);
if (unlikely(r_sample <= t_elapsed))
DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n",
(long)r_sample, (long)t_elapsed);
else
r_sample -= t_elapsed;
CCID3_RTT_SANITY_CHECK(r_sample);
r_sample = dccp_sample_rtt(sk, &now, NULL);
if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
hcrx->ccid3hcrx_rtt = r_sample;

10
net/dccp/ccids/ccid3.h
View File

@ -51,16 +51,6 @@
/* Parameter t_mbi from [RFC 3448, 4.3]: backoff interval in seconds */
#define TFRC_T_MBI 64
/* What we think is a reasonable upper limit on RTT values */
#define CCID3_SANE_RTT_MAX ((suseconds_t)(4 * USEC_PER_SEC))
#define CCID3_RTT_SANITY_CHECK(rtt) do { \
if (rtt > CCID3_SANE_RTT_MAX) { \
DCCP_CRIT("RTT (%d) too large, substituting %d", \
(int)rtt, (int)CCID3_SANE_RTT_MAX); \
rtt = CCID3_SANE_RTT_MAX; \
} } while (0)
enum ccid3_options {
TFRC_OPT_LOSS_EVENT_RATE = 192,
TFRC_OPT_LOSS_INTERVALS = 193,