diff options
| -rw-r--r-- | net/dccp/ccids/ccid3.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c index d77d3e6..7cd76c6 100644 --- a/net/dccp/ccids/ccid3.c +++ b/net/dccp/ccids/ccid3.c @@ -66,15 +66,15 @@ static inline u64 rfc3390_initial_rate(struct sock *sk) } /** - * ccid3_update_send_interval - Calculate new t_ipi = s / X_inst - * This respects the granularity of X_inst (64 * bytes/second). + * ccid3_update_send_interval - Calculate new t_ipi = s / X + * This respects the granularity of X (64 * bytes/second) and enforces the + * scaled minimum of s * 64 / t_mbi = `s' bytes/second as per RFC 3448/4342. */ static void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx) { + if (unlikely(hctx->x <= hctx->s)) + hctx->x = hctx->s; hctx->t_ipi = scaled_div32(((u64)hctx->s) << 6, hctx->x); - - ccid3_pr_debug("t_ipi=%u, s=%u, X=%u\n", hctx->t_ipi, - hctx->s, (unsigned)(hctx->x >> 6)); } static u32 ccid3_hc_tx_idle_rtt(struct ccid3_hc_tx_sock *hctx, ktime_t now) @@ -115,7 +115,6 @@ static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp) if (hctx->p > 0) { hctx->x = min(((u64)hctx->x_calc) << 6, min_rate); - hctx->x = max(hctx->x, (((u64)hctx->s) << 6) / TFRC_T_MBI); } else if (ktime_us_delta(now, hctx->t_ld) - (s64)hctx->rtt >= 0) { @@ -197,8 +196,9 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data) if (hctx->t_rto == 0 || hctx->p == 0) { /* halve send rate directly */ - hctx->x = max(hctx->x / 2, (((u64)hctx->s) << 6) / TFRC_T_MBI); + hctx->x /= 2; ccid3_update_send_interval(hctx); + } else { /* * Modify the cached value of X_recv @@ -213,9 +213,7 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data) BUG_ON(hctx->p && !hctx->x_calc); if (hctx->x_calc > (hctx->x_recv >> 5)) - hctx->x_recv = - max(hctx->x_recv / 2, - (((__u64)hctx->s) << 6) / (2 * TFRC_T_MBI)); + hctx->x_recv /= 2; else { hctx->x_recv = hctx->x_calc; hctx->x_recv <<= 4; |