diff options
author | Ingo Molnar <mingo@elte.hu> | 2008-06-16 05:23:36 -0400 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2008-06-16 05:23:36 -0400 |
commit | 766d02786ecd22932beeb9ca8bad6d8c5a552ef9 (patch) | |
tree | f6f2df0e35bbea914d1f4d12be6d02f128c73575 /net/dccp/ccids/ccid3.c | |
parent | 906d882cacecd37ad2fdd03ed2a9b232bcb9507e (diff) | |
parent | 066519068ad2fbe98c7f45552b1f592903a9c8c8 (diff) |
Merge branch 'linus' into core/rcu
Diffstat (limited to 'net/dccp/ccids/ccid3.c')
-rw-r--r-- | net/dccp/ccids/ccid3.c | 27 |
1 files changed, 14 insertions, 13 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c index cd61dea2eea1..a1929f33d703 100644 --- a/net/dccp/ccids/ccid3.c +++ b/net/dccp/ccids/ccid3.c | |||
@@ -159,8 +159,8 @@ static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp) | |||
159 | } else if (ktime_us_delta(now, hctx->ccid3hctx_t_ld) | 159 | } else if (ktime_us_delta(now, hctx->ccid3hctx_t_ld) |
160 | - (s64)hctx->ccid3hctx_rtt >= 0) { | 160 | - (s64)hctx->ccid3hctx_rtt >= 0) { |
161 | 161 | ||
162 | hctx->ccid3hctx_x = | 162 | hctx->ccid3hctx_x = min(2 * hctx->ccid3hctx_x, min_rate); |
163 | max(min(2 * hctx->ccid3hctx_x, min_rate), | 163 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, |
164 | scaled_div(((__u64)hctx->ccid3hctx_s) << 6, | 164 | scaled_div(((__u64)hctx->ccid3hctx_s) << 6, |
165 | hctx->ccid3hctx_rtt)); | 165 | hctx->ccid3hctx_rtt)); |
166 | hctx->ccid3hctx_t_ld = now; | 166 | hctx->ccid3hctx_t_ld = now; |
@@ -193,22 +193,17 @@ static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) | |||
193 | 193 | ||
194 | /* | 194 | /* |
195 | * Update Window Counter using the algorithm from [RFC 4342, 8.1]. | 195 | * Update Window Counter using the algorithm from [RFC 4342, 8.1]. |
196 | * The algorithm is not applicable if RTT < 4 microseconds. | 196 | * As elsewhere, RTT > 0 is assumed by using dccp_sample_rtt(). |
197 | */ | 197 | */ |
198 | static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, | 198 | static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, |
199 | ktime_t now) | 199 | ktime_t now) |
200 | { | 200 | { |
201 | u32 quarter_rtts; | 201 | u32 delta = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count), |
202 | 202 | quarter_rtts = (4 * delta) / hctx->ccid3hctx_rtt; | |
203 | if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ | ||
204 | return; | ||
205 | |||
206 | quarter_rtts = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count); | ||
207 | quarter_rtts /= hctx->ccid3hctx_rtt / 4; | ||
208 | 203 | ||
209 | if (quarter_rtts > 0) { | 204 | if (quarter_rtts > 0) { |
210 | hctx->ccid3hctx_t_last_win_count = now; | 205 | hctx->ccid3hctx_t_last_win_count = now; |
211 | hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); | 206 | hctx->ccid3hctx_last_win_count += min(quarter_rtts, 5U); |
212 | hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ | 207 | hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ |
213 | } | 208 | } |
214 | } | 209 | } |
@@ -334,8 +329,14 @@ static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) | |||
334 | hctx->ccid3hctx_x = rfc3390_initial_rate(sk); | 329 | hctx->ccid3hctx_x = rfc3390_initial_rate(sk); |
335 | hctx->ccid3hctx_t_ld = now; | 330 | hctx->ccid3hctx_t_ld = now; |
336 | } else { | 331 | } else { |
337 | /* Sender does not have RTT sample: X_pps = 1 pkt/sec */ | 332 | /* |
338 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; | 333 | * Sender does not have RTT sample: |
334 | * - set fallback RTT (RFC 4340, 3.4) since a RTT value | ||
335 | * is needed in several parts (e.g. window counter); | ||
336 | * - set sending rate X_pps = 1pps as per RFC 3448, 4.2. | ||
337 | */ | ||
338 | hctx->ccid3hctx_rtt = DCCP_FALLBACK_RTT; | ||
339 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; | ||
339 | hctx->ccid3hctx_x <<= 6; | 340 | hctx->ccid3hctx_x <<= 6; |
340 | } | 341 | } |
341 | ccid3_update_send_interval(hctx); | 342 | ccid3_update_send_interval(hctx); |