[CCID3]: Update computation of X to use newer timeofday interface
This updates the timestamping references in the computation of X to the newer
ktime_t interface. The time-last-doubled t_ld is now also upgraded to ktime_t;
furthermore up-to-date comments were added to ccid3_hc_tx_update_x().
Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
---
net/dccp/ccids/ccid3.c | 23 ++++++++++-------------
net/dccp/ccids/ccid3.h | 2 +-
2 files changed, 11 insertions(+), 14 deletions(-)
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -110,7 +110,7 @@ struct ccid3_hc_tx_sock {
u8 ccid3hctx_idle;
ktime_t ccid3hctx_t_last_win_count;
struct timer_list ccid3hctx_no_feedback_timer;
- struct timeval ccid3hctx_t_ld;
+ ktime_t ccid3hctx_t_ld;
ktime_t ccid3hctx_t_nom;
u32 ccid3hctx_delta;
struct list_head ccid3hctx_hist;
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -114,27 +114,24 @@ static inline void ccid3_update_send_int
hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6));
}
-/*
- * Update X by
- * If (p > 0)
- * X_calc = calcX(s, R, p);
- * X = max(min(X_calc, 2 * X_recv), s / t_mbi);
- * Else
- * If (now - tld >= R)
- * X = max(min(2 * X, 2 * X_recv), s / R);
- * tld = now;
+
+/**
+ * ccid3_hc_tx_update_x - Update allowed sending rate X
+ * @stamp: most recent time if available - can be left NULL.
+ * This function tracks draft rfc3448bis, check there for latest details.
*
* Note: X and X_recv are both stored in units of 64 * bytes/second, to support
* fine-grained resolution of sending rates. This requires scaling by 2^6
* throughout the code. Only X_calc is unscaled (in bytes/second).
*
*/
-static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now)
+static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp)
{
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
__u64 min_rate = 2 * hctx->ccid3hctx_x_recv;
const __u64 old_x = hctx->ccid3hctx_x;
+ ktime_t now = stamp? *stamp : ktime_get_real();
/*
* Handle IDLE periods: do not reduce below RFC3390 initial sending rate
@@ -154,14 +151,14 @@ static void ccid3_hc_tx_update_x(struct
(((__u64)hctx->ccid3hctx_s) << 6) /
TFRC_T_MBI);
- } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) -
- (suseconds_t)hctx->ccid3hctx_rtt >= 0) {
+ } else if (ktime_delta(now, hctx->ccid3hctx_t_ld)
+ - (s64)hctx->ccid3hctx_rtt >= 0) {
hctx->ccid3hctx_x =
max(min(2 * hctx->ccid3hctx_x, min_rate),
scaled_div(((__u64)hctx->ccid3hctx_s) << 6,
hctx->ccid3hctx_rtt));
- hctx->ccid3hctx_t_ld = *now;
+ hctx->ccid3hctx_t_ld = now;
}
if (hctx->ccid3hctx_x != old_x) {
-
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