Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/dccp/ccids/ccid3.c |
| 3 | * |
Ian McDonald | b2f41ff | 2007-05-28 12:23:29 -0300 | [diff] [blame] | 4 | * Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand. |
| 5 | * Copyright (c) 2005-7 Ian McDonald <ian.mcdonald@jandi.co.nz> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 6 | * |
| 7 | * An implementation of the DCCP protocol |
| 8 | * |
| 9 | * This code has been developed by the University of Waikato WAND |
| 10 | * research group. For further information please see http://www.wand.net.nz/ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 11 | * |
| 12 | * This code also uses code from Lulea University, rereleased as GPL by its |
| 13 | * authors: |
| 14 | * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon |
| 15 | * |
| 16 | * Changes to meet Linux coding standards, to make it meet latest ccid3 draft |
| 17 | * and to make it work as a loadable module in the DCCP stack written by |
| 18 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br>. |
| 19 | * |
| 20 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 21 | * |
| 22 | * This program is free software; you can redistribute it and/or modify |
| 23 | * it under the terms of the GNU General Public License as published by |
| 24 | * the Free Software Foundation; either version 2 of the License, or |
| 25 | * (at your option) any later version. |
| 26 | * |
| 27 | * This program is distributed in the hope that it will be useful, |
| 28 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 29 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 30 | * GNU General Public License for more details. |
| 31 | * |
| 32 | * You should have received a copy of the GNU General Public License |
| 33 | * along with this program; if not, write to the Free Software |
| 34 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 35 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 36 | #include "../ccid.h" |
| 37 | #include "../dccp.h" |
Arnaldo Carvalho de Melo | 4524b25 | 2005-08-27 23:18:26 -0300 | [diff] [blame] | 38 | #include "lib/packet_history.h" |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 39 | #include "lib/loss_interval.h" |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 40 | #include "lib/tfrc.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 41 | #include "ccid3.h" |
| 42 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 43 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
| 44 | static int ccid3_debug; |
| 45 | #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 46 | #else |
| 47 | #define ccid3_pr_debug(format, a...) |
| 48 | #endif |
| 49 | |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 50 | static struct dccp_tx_hist *ccid3_tx_hist; |
| 51 | static struct dccp_rx_hist *ccid3_rx_hist; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 52 | |
Gerrit Renker | 9bf1747 | 2007-03-20 13:11:24 -0300 | [diff] [blame] | 53 | /* |
| 54 | * Transmitter Half-Connection Routines |
| 55 | */ |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 56 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 57 | static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) |
| 58 | { |
| 59 | static char *ccid3_state_names[] = { |
| 60 | [TFRC_SSTATE_NO_SENT] = "NO_SENT", |
| 61 | [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", |
| 62 | [TFRC_SSTATE_FBACK] = "FBACK", |
| 63 | [TFRC_SSTATE_TERM] = "TERM", |
| 64 | }; |
| 65 | |
| 66 | return ccid3_state_names[state]; |
| 67 | } |
| 68 | #endif |
| 69 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 70 | static void ccid3_hc_tx_set_state(struct sock *sk, |
| 71 | enum ccid3_hc_tx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 72 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 73 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 74 | enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; |
| 75 | |
| 76 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 77 | dccp_role(sk), sk, ccid3_tx_state_name(oldstate), |
| 78 | ccid3_tx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 79 | WARN_ON(state == oldstate); |
| 80 | hctx->ccid3hctx_state = state; |
| 81 | } |
| 82 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 83 | /* |
Gerrit Renker | a21f9f9 | 2007-03-20 15:12:10 -0300 | [diff] [blame] | 84 | * Compute the initial sending rate X_init according to RFC 3390: |
| 85 | * w_init = min(4 * MSS, max(2 * MSS, 4380 bytes)) |
| 86 | * X_init = w_init / RTT |
| 87 | * For consistency with other parts of the code, X_init is scaled by 2^6. |
| 88 | */ |
| 89 | static inline u64 rfc3390_initial_rate(struct sock *sk) |
| 90 | { |
| 91 | const struct dccp_sock *dp = dccp_sk(sk); |
| 92 | const __u32 w_init = min(4 * dp->dccps_mss_cache, |
| 93 | max(2 * dp->dccps_mss_cache, 4380U)); |
| 94 | |
| 95 | return scaled_div(w_init << 6, ccid3_hc_tx_sk(sk)->ccid3hctx_rtt); |
| 96 | } |
| 97 | |
| 98 | /* |
Gerrit Renker | 1266ade | 2007-03-20 14:56:11 -0300 | [diff] [blame] | 99 | * Recalculate t_ipi and delta (should be called whenever X changes) |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 100 | */ |
Gerrit Renker | 1266ade | 2007-03-20 14:56:11 -0300 | [diff] [blame] | 101 | static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 102 | { |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 103 | /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ |
Gerrit Renker | b2449fd | 2007-04-20 13:02:55 -0700 | [diff] [blame] | 104 | hctx->ccid3hctx_t_ipi = scaled_div32(((u64)hctx->ccid3hctx_s) << 6, |
| 105 | hctx->ccid3hctx_x); |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 106 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 107 | /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 108 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
| 109 | TFRC_OPSYS_HALF_TIME_GRAN); |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 110 | |
Gerrit Renker | 1761f7d | 2007-03-20 15:04:30 -0300 | [diff] [blame] | 111 | ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 112 | hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta, |
Gerrit Renker | 1761f7d | 2007-03-20 15:04:30 -0300 | [diff] [blame] | 113 | hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6)); |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 114 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 115 | } |
Gerrit Renker | aa97efd | 2007-09-25 22:39:16 -0700 | [diff] [blame^] | 116 | |
| 117 | /** |
| 118 | * ccid3_hc_tx_update_x - Update allowed sending rate X |
| 119 | * @stamp: most recent time if available - can be left NULL. |
| 120 | * This function tracks draft rfc3448bis, check there for latest details. |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 121 | * |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 122 | * Note: X and X_recv are both stored in units of 64 * bytes/second, to support |
| 123 | * fine-grained resolution of sending rates. This requires scaling by 2^6 |
| 124 | * throughout the code. Only X_calc is unscaled (in bytes/second). |
| 125 | * |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 126 | */ |
Gerrit Renker | aa97efd | 2007-09-25 22:39:16 -0700 | [diff] [blame^] | 127 | static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp) |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 128 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 129 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 130 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 131 | __u64 min_rate = 2 * hctx->ccid3hctx_x_recv; |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 132 | const __u64 old_x = hctx->ccid3hctx_x; |
Gerrit Renker | aa97efd | 2007-09-25 22:39:16 -0700 | [diff] [blame^] | 133 | ktime_t now = stamp? *stamp : ktime_get_real(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 134 | |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 135 | /* |
| 136 | * Handle IDLE periods: do not reduce below RFC3390 initial sending rate |
| 137 | * when idling [RFC 4342, 5.1]. See also draft-ietf-dccp-rfc3448bis. |
| 138 | * For consistency with X and X_recv, min_rate is also scaled by 2^6. |
| 139 | */ |
| 140 | if (unlikely(hctx->ccid3hctx_idle)) { |
| 141 | min_rate = rfc3390_initial_rate(sk); |
| 142 | min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv); |
| 143 | } |
| 144 | |
Gerrit Renker | 4415830 | 2006-12-03 14:53:07 -0200 | [diff] [blame] | 145 | if (hctx->ccid3hctx_p > 0) { |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 146 | |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 147 | hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 148 | min_rate); |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 149 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, |
| 150 | (((__u64)hctx->ccid3hctx_s) << 6) / |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 151 | TFRC_T_MBI); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 152 | |
Gerrit Renker | aa97efd | 2007-09-25 22:39:16 -0700 | [diff] [blame^] | 153 | } else if (ktime_us_delta(now, hctx->ccid3hctx_t_ld) |
| 154 | - (s64)hctx->ccid3hctx_rtt >= 0) { |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 155 | |
Gerrit Renker | aa97efd | 2007-09-25 22:39:16 -0700 | [diff] [blame^] | 156 | hctx->ccid3hctx_x = |
| 157 | max(min(2 * hctx->ccid3hctx_x, min_rate), |
| 158 | scaled_div(((__u64)hctx->ccid3hctx_s) << 6, |
| 159 | hctx->ccid3hctx_rtt)); |
| 160 | hctx->ccid3hctx_t_ld = now; |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame] | 161 | } |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 162 | |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 163 | if (hctx->ccid3hctx_x != old_x) { |
Gerrit Renker | 1761f7d | 2007-03-20 15:04:30 -0300 | [diff] [blame] | 164 | ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " |
| 165 | "X_recv=%u\n", (unsigned)(old_x >> 6), |
| 166 | (unsigned)(hctx->ccid3hctx_x >> 6), |
| 167 | hctx->ccid3hctx_x_calc, |
| 168 | (unsigned)(hctx->ccid3hctx_x_recv >> 6)); |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 169 | |
Gerrit Renker | 1266ade | 2007-03-20 14:56:11 -0300 | [diff] [blame] | 170 | ccid3_update_send_interval(hctx); |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 171 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 172 | } |
| 173 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 174 | /* |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 175 | * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) |
| 176 | * @len: DCCP packet payload size in bytes |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 177 | */ |
| 178 | static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) |
| 179 | { |
Gerrit Renker | 1266ade | 2007-03-20 14:56:11 -0300 | [diff] [blame] | 180 | const u16 old_s = hctx->ccid3hctx_s; |
| 181 | |
| 182 | hctx->ccid3hctx_s = old_s == 0 ? len : (9 * old_s + len) / 10; |
| 183 | |
| 184 | if (hctx->ccid3hctx_s != old_s) |
| 185 | ccid3_update_send_interval(hctx); |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 186 | } |
| 187 | |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 188 | /* |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 189 | * Update Window Counter using the algorithm from [RFC 4342, 8.1]. |
| 190 | * The algorithm is not applicable if RTT < 4 microseconds. |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 191 | */ |
| 192 | static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, |
Gerrit Renker | 8132da4 | 2007-06-16 13:34:02 -0300 | [diff] [blame] | 193 | ktime_t now) |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 194 | { |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 195 | u32 quarter_rtts; |
| 196 | |
| 197 | if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ |
| 198 | return; |
| 199 | |
Gerrit Renker | 8132da4 | 2007-06-16 13:34:02 -0300 | [diff] [blame] | 200 | quarter_rtts = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count); |
| 201 | quarter_rtts /= hctx->ccid3hctx_rtt / 4; |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 202 | |
| 203 | if (quarter_rtts > 0) { |
Gerrit Renker | 8132da4 | 2007-06-16 13:34:02 -0300 | [diff] [blame] | 204 | hctx->ccid3hctx_t_last_win_count = now; |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 205 | hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); |
| 206 | hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 207 | } |
| 208 | } |
| 209 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 210 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
| 211 | { |
| 212 | struct sock *sk = (struct sock *)data; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 213 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 214 | unsigned long t_nfb = USEC_PER_SEC / 5; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 215 | |
| 216 | bh_lock_sock(sk); |
| 217 | if (sock_owned_by_user(sk)) { |
| 218 | /* Try again later. */ |
| 219 | /* XXX: set some sensible MIB */ |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 220 | goto restart_timer; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 221 | } |
| 222 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 223 | ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 224 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 225 | |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 226 | hctx->ccid3hctx_idle = 1; |
| 227 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 228 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 229 | case TFRC_SSTATE_NO_FBACK: |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 230 | /* RFC 3448, 4.4: Halve send rate directly */ |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 231 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, |
| 232 | (((__u64)hctx->ccid3hctx_s) << 6) / |
| 233 | TFRC_T_MBI); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 234 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 235 | ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " |
| 236 | "bytes/s\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 237 | ccid3_tx_state_name(hctx->ccid3hctx_state), |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 238 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 239 | /* The value of R is still undefined and so we can not recompute |
| 240 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 241 | t_nfb = TFRC_INITIAL_TIMEOUT; |
Gerrit Renker | 1266ade | 2007-03-20 14:56:11 -0300 | [diff] [blame] | 242 | ccid3_update_send_interval(hctx); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 243 | break; |
| 244 | case TFRC_SSTATE_FBACK: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 245 | /* |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 246 | * Modify the cached value of X_recv [RFC 3448, 4.4] |
| 247 | * |
| 248 | * If (p == 0 || X_calc > 2 * X_recv) |
| 249 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); |
| 250 | * Else |
| 251 | * X_recv = X_calc / 4; |
| 252 | * |
| 253 | * Note that X_recv is scaled by 2^6 while X_calc is not |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 254 | */ |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 255 | BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 256 | |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 257 | if (hctx->ccid3hctx_p == 0 || |
| 258 | (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 259 | |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 260 | hctx->ccid3hctx_x_recv = |
| 261 | max(hctx->ccid3hctx_x_recv / 2, |
| 262 | (((__u64)hctx->ccid3hctx_s) << 6) / |
| 263 | (2 * TFRC_T_MBI)); |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 264 | } else { |
| 265 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; |
| 266 | hctx->ccid3hctx_x_recv <<= 4; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 267 | } |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 268 | /* Now recalculate X [RFC 3448, 4.3, step (4)] */ |
Gerrit Renker | aa97efd | 2007-09-25 22:39:16 -0700 | [diff] [blame^] | 269 | ccid3_hc_tx_update_x(sk, NULL); |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 270 | /* |
| 271 | * Schedule no feedback timer to expire in |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 272 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
| 273 | * See comments in packet_recv() regarding the value of t_RTO. |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 274 | */ |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 275 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 276 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 277 | case TFRC_SSTATE_NO_SENT: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 278 | DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 279 | /* fall through */ |
| 280 | case TFRC_SSTATE_TERM: |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 281 | goto out; |
| 282 | } |
| 283 | |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 284 | restart_timer: |
| 285 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 286 | jiffies + usecs_to_jiffies(t_nfb)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 287 | out: |
| 288 | bh_unlock_sock(sk); |
| 289 | sock_put(sk); |
| 290 | } |
| 291 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 292 | /* |
| 293 | * returns |
| 294 | * > 0: delay (in msecs) that should pass before actually sending |
| 295 | * = 0: can send immediately |
| 296 | * < 0: error condition; do not send packet |
| 297 | */ |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 298 | static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 299 | { |
| 300 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 301 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 8132da4 | 2007-06-16 13:34:02 -0300 | [diff] [blame] | 302 | ktime_t now = ktime_get_real(); |
| 303 | s64 delay; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 304 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 305 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 306 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 307 | /* |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 308 | * This function is called only for Data and DataAck packets. Sending |
| 309 | * zero-sized Data(Ack)s is theoretically possible, but for congestion |
| 310 | * control this case is pathological - ignore it. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 311 | */ |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 312 | if (unlikely(skb->len == 0)) |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 313 | return -EBADMSG; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 314 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 315 | switch (hctx->ccid3hctx_state) { |
| 316 | case TFRC_SSTATE_NO_SENT: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 317 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 318 | (jiffies + |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 319 | usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 320 | hctx->ccid3hctx_last_win_count = 0; |
| 321 | hctx->ccid3hctx_t_last_win_count = now; |
Gerrit Renker | 90feeb9 | 2006-11-27 12:13:38 -0200 | [diff] [blame] | 322 | |
| 323 | /* Set t_0 for initial packet */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 324 | hctx->ccid3hctx_t_nom = now; |
Gerrit Renker | 30833ff | 2007-03-20 15:31:56 -0300 | [diff] [blame] | 325 | |
| 326 | hctx->ccid3hctx_s = skb->len; |
| 327 | |
| 328 | /* |
| 329 | * Use initial RTT sample when available: recommended by erratum |
| 330 | * to RFC 4342. This implements the initialisation procedure of |
| 331 | * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6. |
| 332 | */ |
| 333 | if (dp->dccps_syn_rtt) { |
| 334 | ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt); |
| 335 | hctx->ccid3hctx_rtt = dp->dccps_syn_rtt; |
| 336 | hctx->ccid3hctx_x = rfc3390_initial_rate(sk); |
Arnaldo Carvalho de Melo | 23f062a | 2007-08-19 17:14:52 -0700 | [diff] [blame] | 337 | hctx->ccid3hctx_t_ld = now; |
Gerrit Renker | 30833ff | 2007-03-20 15:31:56 -0300 | [diff] [blame] | 338 | } else { |
| 339 | /* Sender does not have RTT sample: X = MSS/second */ |
| 340 | hctx->ccid3hctx_x = dp->dccps_mss_cache; |
| 341 | hctx->ccid3hctx_x <<= 6; |
| 342 | } |
| 343 | ccid3_update_send_interval(hctx); |
| 344 | |
| 345 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 346 | break; |
| 347 | case TFRC_SSTATE_NO_FBACK: |
| 348 | case TFRC_SSTATE_FBACK: |
Gerrit Renker | 8132da4 | 2007-06-16 13:34:02 -0300 | [diff] [blame] | 349 | delay = ktime_us_delta(hctx->ccid3hctx_t_nom, now); |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 350 | ccid3_pr_debug("delay=%ld\n", (long)delay); |
Gerrit Renker | 91cf5a1 | 2006-11-27 12:25:10 -0200 | [diff] [blame] | 351 | /* |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 352 | * Scheduling of packet transmissions [RFC 3448, 4.6] |
Gerrit Renker | 91cf5a1 | 2006-11-27 12:25:10 -0200 | [diff] [blame] | 353 | * |
| 354 | * if (t_now > t_nom - delta) |
| 355 | * // send the packet now |
| 356 | * else |
| 357 | * // send the packet in (t_nom - t_now) milliseconds. |
| 358 | */ |
Gerrit Renker | 49d66a7 | 2007-06-16 13:48:50 -0300 | [diff] [blame] | 359 | if (delay - (s64)hctx->ccid3hctx_delta >= 1000) |
Gerrit Renker | 8132da4 | 2007-06-16 13:34:02 -0300 | [diff] [blame] | 360 | return (u32)delay / 1000L; |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 361 | |
Gerrit Renker | 8132da4 | 2007-06-16 13:34:02 -0300 | [diff] [blame] | 362 | ccid3_hc_tx_update_win_count(hctx, now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 363 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 364 | case TFRC_SSTATE_TERM: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 365 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 366 | return -EINVAL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 367 | } |
| 368 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 369 | /* prepare to send now (add options etc.) */ |
| 370 | dp->dccps_hc_tx_insert_options = 1; |
Gerrit Renker | e312d10 | 2006-12-10 00:08:09 -0200 | [diff] [blame] | 371 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 372 | hctx->ccid3hctx_idle = 0; |
Gerrit Renker | e312d10 | 2006-12-10 00:08:09 -0200 | [diff] [blame] | 373 | |
| 374 | /* set the nominal send time for the next following packet */ |
Gerrit Renker | 8132da4 | 2007-06-16 13:34:02 -0300 | [diff] [blame] | 375 | hctx->ccid3hctx_t_nom = ktime_add_us(hctx->ccid3hctx_t_nom, |
| 376 | hctx->ccid3hctx_t_ipi); |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 377 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 380 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, |
| 381 | unsigned int len) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 382 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 383 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 384 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 385 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 386 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 387 | |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 388 | ccid3_hc_tx_update_s(hctx, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 389 | |
Gerrit Renker | c5a1ae9 | 2006-12-10 00:09:21 -0200 | [diff] [blame] | 390 | packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 391 | if (unlikely(packet == NULL)) { |
Gerrit Renker | c5a1ae9 | 2006-12-10 00:09:21 -0200 | [diff] [blame] | 392 | DCCP_CRIT("packet history - out of memory!"); |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 393 | return; |
| 394 | } |
Gerrit Renker | c5a1ae9 | 2006-12-10 00:09:21 -0200 | [diff] [blame] | 395 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); |
| 396 | |
Arnaldo Carvalho de Melo | 0740d49 | 2007-08-19 17:18:13 -0700 | [diff] [blame] | 397 | packet->dccphtx_tstamp = ktime_get_real(); |
Gerrit Renker | c5a1ae9 | 2006-12-10 00:09:21 -0200 | [diff] [blame] | 398 | packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; |
| 399 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
| 400 | packet->dccphtx_sent = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 404 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 405 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 406 | struct ccid3_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 407 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 0740d49 | 2007-08-19 17:18:13 -0700 | [diff] [blame] | 408 | ktime_t now; |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 409 | unsigned long t_nfb; |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 410 | u32 pinv, r_sample; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 411 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 412 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 413 | |
| 414 | /* we are only interested in ACKs */ |
| 415 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || |
| 416 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) |
| 417 | return; |
| 418 | |
| 419 | opt_recv = &hctx->ccid3hctx_options_received; |
| 420 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 421 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 422 | case TFRC_SSTATE_NO_FBACK: |
| 423 | case TFRC_SSTATE_FBACK: |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 424 | /* get packet from history to look up t_recvdata */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 425 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 426 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 427 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 428 | DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 429 | "in history!\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 430 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 431 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 432 | return; |
| 433 | } |
| 434 | |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 435 | /* Update receive rate in units of 64 * bytes/second */ |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 436 | hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; |
| 437 | hctx->ccid3hctx_x_recv <<= 6; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 438 | |
| 439 | /* Update loss event rate */ |
| 440 | pinv = opt_recv->ccid3or_loss_event_rate; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 441 | if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 442 | hctx->ccid3hctx_p = 0; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 443 | else /* can not exceed 100% */ |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 444 | hctx->ccid3hctx_p = 1000000 / pinv; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 445 | |
Arnaldo Carvalho de Melo | 9823b7b | 2007-08-19 17:16:35 -0700 | [diff] [blame] | 446 | now = ktime_get_real(); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 447 | /* |
| 448 | * Calculate new round trip sample as per [RFC 3448, 4.3] by |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 449 | * R_sample = (now - t_recvdata) - t_elapsed |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 450 | */ |
Arnaldo Carvalho de Melo | 0740d49 | 2007-08-19 17:18:13 -0700 | [diff] [blame] | 451 | r_sample = dccp_sample_rtt(sk, now, &packet->dccphtx_tstamp); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 452 | |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 453 | /* |
| 454 | * Update RTT estimate by |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 455 | * If (No feedback recv) |
| 456 | * R = R_sample; |
| 457 | * Else |
| 458 | * R = q * R + (1 - q) * R_sample; |
| 459 | * |
| 460 | * q is a constant, RFC 3448 recomments 0.9 |
| 461 | */ |
| 462 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 463 | /* |
| 464 | * Larger Initial Windows [RFC 4342, sec. 5] |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 465 | */ |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 466 | hctx->ccid3hctx_rtt = r_sample; |
Gerrit Renker | a21f9f9 | 2007-03-20 15:12:10 -0300 | [diff] [blame] | 467 | hctx->ccid3hctx_x = rfc3390_initial_rate(sk); |
Arnaldo Carvalho de Melo | 9823b7b | 2007-08-19 17:16:35 -0700 | [diff] [blame] | 468 | hctx->ccid3hctx_t_ld = now; |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 469 | |
Gerrit Renker | 1266ade | 2007-03-20 14:56:11 -0300 | [diff] [blame] | 470 | ccid3_update_send_interval(hctx); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 471 | |
Gerrit Renker | a21f9f9 | 2007-03-20 15:12:10 -0300 | [diff] [blame] | 472 | ccid3_pr_debug("%s(%p), s=%u, MSS=%u, " |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 473 | "R_sample=%uus, X=%u\n", dccp_role(sk), |
Andrew Morton | 0f08461 | 2007-02-05 18:18:21 -0800 | [diff] [blame] | 474 | sk, hctx->ccid3hctx_s, |
David S. Miller | 1b07a95 | 2007-05-23 17:43:11 -0700 | [diff] [blame] | 475 | dccp_sk(sk)->dccps_mss_cache, r_sample, |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 476 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 477 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 478 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 479 | } else { |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 480 | hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 481 | r_sample) / 10; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 482 | |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame] | 483 | /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ |
| 484 | if (hctx->ccid3hctx_p > 0) |
| 485 | hctx->ccid3hctx_x_calc = |
| 486 | tfrc_calc_x(hctx->ccid3hctx_s, |
| 487 | hctx->ccid3hctx_rtt, |
| 488 | hctx->ccid3hctx_p); |
Gerrit Renker | aa97efd | 2007-09-25 22:39:16 -0700 | [diff] [blame^] | 489 | ccid3_hc_tx_update_x(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 490 | |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 491 | ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, " |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 492 | "p=%u, X_calc=%u, X_recv=%u, X=%u\n", |
| 493 | dccp_role(sk), |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 494 | sk, hctx->ccid3hctx_rtt, r_sample, |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 495 | hctx->ccid3hctx_s, hctx->ccid3hctx_p, |
| 496 | hctx->ccid3hctx_x_calc, |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 497 | (unsigned)(hctx->ccid3hctx_x_recv >> 6), |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 498 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | /* unschedule no feedback timer */ |
| 502 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 503 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 504 | /* remove all packets older than the one acked from history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 505 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
| 506 | &hctx->ccid3hctx_hist, packet); |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 507 | /* |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 508 | * As we have calculated new ipi, delta, t_nom it is possible |
| 509 | * that we now can send a packet, so wake up dccp_wait_for_ccid |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 510 | */ |
| 511 | sk->sk_write_space(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 512 | |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 513 | /* |
| 514 | * Update timeout interval for the nofeedback timer. |
| 515 | * We use a configuration option to increase the lower bound. |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 516 | * This can help avoid triggering the nofeedback timer too |
| 517 | * often ('spinning') on LANs with small RTTs. |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 518 | */ |
Gerrit Renker | 5d0dbc4 | 2006-11-27 20:32:37 -0200 | [diff] [blame] | 519 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 520 | CONFIG_IP_DCCP_CCID3_RTO * |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 521 | (USEC_PER_SEC/1000)); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 522 | /* |
| 523 | * Schedule no feedback timer to expire in |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 524 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 525 | */ |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 526 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 527 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 528 | ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 529 | "expire in %lu jiffies (%luus)\n", |
| 530 | dccp_role(sk), |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 531 | sk, usecs_to_jiffies(t_nfb), t_nfb); |
| 532 | |
| 533 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 534 | jiffies + usecs_to_jiffies(t_nfb)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 535 | |
| 536 | /* set idle flag */ |
Gerrit Renker | bf58a38 | 2006-12-10 00:04:43 -0200 | [diff] [blame] | 537 | hctx->ccid3hctx_idle = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 538 | break; |
Gerrit Renker | 151a993 | 2007-03-07 12:53:48 -0800 | [diff] [blame] | 539 | case TFRC_SSTATE_NO_SENT: /* fall through */ |
Gerrit Renker | 5e19e3f | 2006-11-27 12:28:48 -0200 | [diff] [blame] | 540 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 541 | break; |
| 542 | } |
| 543 | } |
| 544 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 545 | static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 546 | unsigned char len, u16 idx, |
| 547 | unsigned char *value) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 548 | { |
| 549 | int rc = 0; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 550 | const struct dccp_sock *dp = dccp_sk(sk); |
| 551 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 552 | struct ccid3_options_received *opt_recv; |
| 553 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 554 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 555 | |
| 556 | opt_recv = &hctx->ccid3hctx_options_received; |
| 557 | |
| 558 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { |
| 559 | opt_recv->ccid3or_seqno = dp->dccps_gsr; |
| 560 | opt_recv->ccid3or_loss_event_rate = ~0; |
| 561 | opt_recv->ccid3or_loss_intervals_idx = 0; |
| 562 | opt_recv->ccid3or_loss_intervals_len = 0; |
| 563 | opt_recv->ccid3or_receive_rate = 0; |
| 564 | } |
| 565 | |
| 566 | switch (option) { |
| 567 | case TFRC_OPT_LOSS_EVENT_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 568 | if (unlikely(len != 4)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 569 | DCCP_WARN("%s(%p), invalid len %d " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 570 | "for TFRC_OPT_LOSS_EVENT_RATE\n", |
| 571 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 572 | rc = -EINVAL; |
| 573 | } else { |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 574 | opt_recv->ccid3or_loss_event_rate = |
| 575 | ntohl(*(__be32 *)value); |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 576 | ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 577 | dccp_role(sk), sk, |
| 578 | opt_recv->ccid3or_loss_event_rate); |
| 579 | } |
| 580 | break; |
| 581 | case TFRC_OPT_LOSS_INTERVALS: |
| 582 | opt_recv->ccid3or_loss_intervals_idx = idx; |
| 583 | opt_recv->ccid3or_loss_intervals_len = len; |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 584 | ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 585 | dccp_role(sk), sk, |
| 586 | opt_recv->ccid3or_loss_intervals_idx, |
| 587 | opt_recv->ccid3or_loss_intervals_len); |
| 588 | break; |
| 589 | case TFRC_OPT_RECEIVE_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 590 | if (unlikely(len != 4)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 591 | DCCP_WARN("%s(%p), invalid len %d " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 592 | "for TFRC_OPT_RECEIVE_RATE\n", |
| 593 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 594 | rc = -EINVAL; |
| 595 | } else { |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 596 | opt_recv->ccid3or_receive_rate = |
| 597 | ntohl(*(__be32 *)value); |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 598 | ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 599 | dccp_role(sk), sk, |
| 600 | opt_recv->ccid3or_receive_rate); |
| 601 | } |
| 602 | break; |
| 603 | } |
| 604 | |
| 605 | return rc; |
| 606 | } |
| 607 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 608 | static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 609 | { |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 610 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 611 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 612 | hctx->ccid3hctx_s = 0; |
Gerrit Renker | fe0499a | 2006-12-10 00:06:01 -0200 | [diff] [blame] | 613 | hctx->ccid3hctx_rtt = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 614 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
| 615 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | aa5d7df | 2006-03-20 17:35:13 -0800 | [diff] [blame] | 616 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 617 | hctx->ccid3hctx_no_feedback_timer.function = |
| 618 | ccid3_hc_tx_no_feedback_timer; |
Arnaldo Carvalho de Melo | aa5d7df | 2006-03-20 17:35:13 -0800 | [diff] [blame] | 619 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 620 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
| 621 | |
| 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | static void ccid3_hc_tx_exit(struct sock *sk) |
| 626 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 627 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 628 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 629 | BUG_ON(hctx == NULL); |
| 630 | |
| 631 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); |
| 632 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 633 | |
| 634 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 635 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 636 | } |
| 637 | |
Gerrit Renker | 9bf1747 | 2007-03-20 13:11:24 -0300 | [diff] [blame] | 638 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) |
| 639 | { |
| 640 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 641 | |
Gerrit Renker | 9bf1747 | 2007-03-20 13:11:24 -0300 | [diff] [blame] | 642 | /* Listen socks doesn't have a private CCID block */ |
| 643 | if (sk->sk_state == DCCP_LISTEN) |
| 644 | return; |
| 645 | |
| 646 | BUG_ON(hctx == NULL); |
| 647 | |
| 648 | info->tcpi_rto = hctx->ccid3hctx_t_rto; |
| 649 | info->tcpi_rtt = hctx->ccid3hctx_rtt; |
| 650 | } |
| 651 | |
| 652 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, |
| 653 | u32 __user *optval, int __user *optlen) |
| 654 | { |
| 655 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
| 656 | const void *val; |
| 657 | |
| 658 | /* Listen socks doesn't have a private CCID block */ |
| 659 | if (sk->sk_state == DCCP_LISTEN) |
| 660 | return -EINVAL; |
| 661 | |
| 662 | switch (optname) { |
| 663 | case DCCP_SOCKOPT_CCID_TX_INFO: |
| 664 | if (len < sizeof(hctx->ccid3hctx_tfrc)) |
| 665 | return -EINVAL; |
| 666 | len = sizeof(hctx->ccid3hctx_tfrc); |
| 667 | val = &hctx->ccid3hctx_tfrc; |
| 668 | break; |
| 669 | default: |
| 670 | return -ENOPROTOOPT; |
| 671 | } |
| 672 | |
| 673 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 674 | return -EFAULT; |
| 675 | |
| 676 | return 0; |
| 677 | } |
| 678 | |
| 679 | /* |
| 680 | * Receiver Half-Connection Routines |
| 681 | */ |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 682 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 683 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
| 684 | { |
| 685 | static char *ccid3_rx_state_names[] = { |
| 686 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", |
| 687 | [TFRC_RSTATE_DATA] = "DATA", |
| 688 | [TFRC_RSTATE_TERM] = "TERM", |
| 689 | }; |
| 690 | |
| 691 | return ccid3_rx_state_names[state]; |
| 692 | } |
| 693 | #endif |
| 694 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 695 | static void ccid3_hc_rx_set_state(struct sock *sk, |
| 696 | enum ccid3_hc_rx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 697 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 698 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 699 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
| 700 | |
| 701 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 702 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
| 703 | ccid3_rx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 704 | WARN_ON(state == oldstate); |
| 705 | hcrx->ccid3hcrx_state = state; |
| 706 | } |
| 707 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 708 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
| 709 | { |
| 710 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ |
| 711 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); |
| 712 | else |
| 713 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : |
| 714 | (9 * hcrx->ccid3hcrx_s + len) / 10; |
| 715 | } |
| 716 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 717 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
| 718 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 719 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 720 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 721 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | e7c2335 | 2007-08-19 17:17:51 -0700 | [diff] [blame] | 722 | ktime_t now; |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 723 | suseconds_t delta; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 724 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 725 | ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 726 | |
Arnaldo Carvalho de Melo | e7a81c6 | 2007-08-19 17:15:37 -0700 | [diff] [blame] | 727 | now = ktime_get_real(); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 728 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 729 | switch (hcrx->ccid3hcrx_state) { |
| 730 | case TFRC_RSTATE_NO_DATA: |
| 731 | hcrx->ccid3hcrx_x_recv = 0; |
| 732 | break; |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 733 | case TFRC_RSTATE_DATA: |
Arnaldo Carvalho de Melo | e7a81c6 | 2007-08-19 17:15:37 -0700 | [diff] [blame] | 734 | delta = ktime_us_delta(now, |
| 735 | hcrx->ccid3hcrx_tstamp_last_feedback); |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 736 | DCCP_BUG_ON(delta < 0); |
Gerrit Renker | b9039a2 | 2006-12-10 00:02:51 -0200 | [diff] [blame] | 737 | hcrx->ccid3hcrx_x_recv = |
| 738 | scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 739 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 740 | case TFRC_RSTATE_TERM: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 741 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 742 | return; |
| 743 | } |
| 744 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 745 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 746 | if (unlikely(packet == NULL)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 747 | DCCP_WARN("%s(%p), no data packet in history!\n", |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 748 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 749 | return; |
| 750 | } |
| 751 | |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 752 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 753 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 754 | hcrx->ccid3hcrx_bytes_recv = 0; |
| 755 | |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 756 | /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ |
Arnaldo Carvalho de Melo | e7c2335 | 2007-08-19 17:17:51 -0700 | [diff] [blame] | 757 | delta = ktime_us_delta(now, packet->dccphrx_tstamp); |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 758 | DCCP_BUG_ON(delta < 0); |
| 759 | hcrx->ccid3hcrx_elapsed_time = delta / 10; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 760 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 761 | if (hcrx->ccid3hcrx_p == 0) |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 762 | hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ |
| 763 | else if (hcrx->ccid3hcrx_p > 1000000) { |
| 764 | DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); |
| 765 | hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ |
| 766 | } else |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 767 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 768 | |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 769 | dp->dccps_hc_rx_insert_options = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 770 | dccp_send_ack(sk); |
| 771 | } |
| 772 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 773 | static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 774 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 775 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 776 | __be32 x_recv, pinv; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 777 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 778 | BUG_ON(hcrx == NULL); |
| 779 | |
| 780 | if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 781 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 782 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 783 | DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 784 | |
| 785 | if (dccp_packet_without_ack(skb)) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 786 | return 0; |
| 787 | |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 788 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
| 789 | pinv = htonl(hcrx->ccid3hcrx_pinv); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 790 | |
| 791 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && |
| 792 | dccp_insert_option_elapsed_time(sk, skb, |
| 793 | hcrx->ccid3hcrx_elapsed_time)) || |
| 794 | dccp_insert_option_timestamp(sk, skb) || |
| 795 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 796 | &pinv, sizeof(pinv)) || |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 797 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 798 | &x_recv, sizeof(x_recv))) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 799 | return -1; |
| 800 | |
| 801 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 802 | } |
| 803 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 804 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 805 | struct dccp_rx_hist_entry *packet) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 806 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 807 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 808 | struct dccp_rx_hist_entry *rx_hist = |
| 809 | dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 810 | u64 seqno = packet->dccphrx_seqno; |
| 811 | u64 tmp_seqno; |
| 812 | int loss = 0; |
| 813 | u8 ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 814 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 815 | |
| 816 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 817 | |
| 818 | if (!rx_hist || |
| 819 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 820 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 821 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 822 | goto detect_out; |
| 823 | } |
| 824 | |
| 825 | |
| 826 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
| 827 | > TFRC_RECV_NUM_LATE_LOSS) { |
| 828 | loss = 1; |
Arnaldo Carvalho de Melo | cc4d6a3 | 2007-05-28 18:53:08 -0300 | [diff] [blame] | 829 | dccp_li_update_li(sk, |
Arnaldo Carvalho de Melo | cc0a910 | 2007-06-14 17:41:28 -0300 | [diff] [blame] | 830 | &hcrx->ccid3hcrx_li_hist, |
| 831 | &hcrx->ccid3hcrx_hist, |
Arnaldo Carvalho de Melo | e7c2335 | 2007-08-19 17:17:51 -0700 | [diff] [blame] | 832 | hcrx->ccid3hcrx_tstamp_last_feedback, |
Arnaldo Carvalho de Melo | cc0a910 | 2007-06-14 17:41:28 -0300 | [diff] [blame] | 833 | hcrx->ccid3hcrx_s, |
| 834 | hcrx->ccid3hcrx_bytes_recv, |
| 835 | hcrx->ccid3hcrx_x_recv, |
| 836 | hcrx->ccid3hcrx_seqno_nonloss, |
| 837 | hcrx->ccid3hcrx_ccval_nonloss); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 838 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 839 | dccp_inc_seqno(&tmp_seqno); |
| 840 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 841 | dccp_inc_seqno(&tmp_seqno); |
| 842 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, |
| 843 | tmp_seqno, &ccval)) { |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 844 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 845 | hcrx->ccid3hcrx_ccval_nonloss = ccval; |
| 846 | dccp_inc_seqno(&tmp_seqno); |
| 847 | } |
| 848 | } |
| 849 | |
| 850 | /* FIXME - this code could be simplified with above while */ |
| 851 | /* but works at moment */ |
| 852 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 853 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 854 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 855 | } |
| 856 | |
| 857 | detect_out: |
| 858 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, |
| 859 | &hcrx->ccid3hcrx_li_hist, packet, |
| 860 | hcrx->ccid3hcrx_seqno_nonloss); |
| 861 | return loss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 862 | } |
| 863 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 864 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 865 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 866 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 867 | const struct dccp_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 868 | struct dccp_rx_hist_entry *packet; |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 869 | u32 p_prev, r_sample, rtt_prev; |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 870 | int loss, payload_size; |
Arnaldo Carvalho de Melo | 9823b7b | 2007-08-19 17:16:35 -0700 | [diff] [blame] | 871 | ktime_t now; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 872 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 873 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 874 | |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 875 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 876 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 877 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
| 878 | case DCCP_PKT_ACK: |
| 879 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 880 | return; |
Arnaldo Carvalho de Melo | 9823b7b | 2007-08-19 17:16:35 -0700 | [diff] [blame] | 881 | case DCCP_PKT_DATAACK: |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 882 | if (opt_recv->dccpor_timestamp_echo == 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 883 | break; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 884 | rtt_prev = hcrx->ccid3hcrx_rtt; |
Arnaldo Carvalho de Melo | 9823b7b | 2007-08-19 17:16:35 -0700 | [diff] [blame] | 885 | now = ktime_get_real(); |
| 886 | r_sample = dccp_sample_rtt(sk, now, NULL); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 887 | |
| 888 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 889 | hcrx->ccid3hcrx_rtt = r_sample; |
| 890 | else |
| 891 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + |
| 892 | r_sample / 10; |
| 893 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 894 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 895 | ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", |
| 896 | dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 897 | opt_recv->dccpor_elapsed_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 898 | break; |
| 899 | case DCCP_PKT_DATA: |
| 900 | break; |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 901 | default: /* We're not interested in other packet types, move along */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 902 | return; |
| 903 | } |
| 904 | |
Arnaldo Carvalho de Melo | e7c2335 | 2007-08-19 17:17:51 -0700 | [diff] [blame] | 905 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp, |
Christoph Lameter | 54e6ecb | 2006-12-06 20:33:16 -0800 | [diff] [blame] | 906 | skb, GFP_ATOMIC); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 907 | if (unlikely(packet == NULL)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 908 | DCCP_WARN("%s(%p), Not enough mem to add rx packet " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 909 | "to history, consider it lost!\n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 910 | return; |
| 911 | } |
| 912 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 913 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 914 | |
| 915 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) |
| 916 | return; |
| 917 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 918 | payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; |
| 919 | ccid3_hc_rx_update_s(hcrx, payload_size); |
| 920 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 921 | switch (hcrx->ccid3hcrx_state) { |
| 922 | case TFRC_RSTATE_NO_DATA: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 923 | ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " |
| 924 | "feedback\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 925 | dccp_state_name(sk->sk_state), skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 926 | ccid3_hc_rx_send_feedback(sk); |
| 927 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); |
| 928 | return; |
Arnaldo Carvalho de Melo | 9823b7b | 2007-08-19 17:16:35 -0700 | [diff] [blame] | 929 | case TFRC_RSTATE_DATA: |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 930 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 931 | if (loss) |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 932 | break; |
| 933 | |
Arnaldo Carvalho de Melo | 1faf0a1 | 2007-08-19 17:15:13 -0700 | [diff] [blame] | 934 | now = ktime_get_real(); |
| 935 | if ((ktime_us_delta(now, hcrx->ccid3hcrx_tstamp_last_ack) - |
| 936 | (s64)hcrx->ccid3hcrx_rtt) >= 0) { |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 937 | hcrx->ccid3hcrx_tstamp_last_ack = now; |
| 938 | ccid3_hc_rx_send_feedback(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 939 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 940 | return; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 941 | case TFRC_RSTATE_TERM: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 942 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 943 | return; |
| 944 | } |
| 945 | |
| 946 | /* Dealing with packet loss */ |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 947 | ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 948 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 949 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 950 | p_prev = hcrx->ccid3hcrx_p; |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 951 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 952 | /* Calculate loss event rate */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 953 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 954 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); |
| 955 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 956 | /* Scaling up by 1000000 as fixed decimal */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 957 | if (i_mean != 0) |
| 958 | hcrx->ccid3hcrx_p = 1000000 / i_mean; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 959 | } else |
| 960 | DCCP_BUG("empty loss history"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 961 | |
| 962 | if (hcrx->ccid3hcrx_p > p_prev) { |
| 963 | ccid3_hc_rx_send_feedback(sk); |
| 964 | return; |
| 965 | } |
| 966 | } |
| 967 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 968 | static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 969 | { |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 970 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 971 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 972 | ccid3_pr_debug("entry\n"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 973 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 974 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
| 975 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 976 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
Arnaldo Carvalho de Melo | 1faf0a1 | 2007-08-19 17:15:13 -0700 | [diff] [blame] | 977 | hcrx->ccid3hcrx_tstamp_last_feedback = |
Arnaldo Carvalho de Melo | e7a81c6 | 2007-08-19 17:15:37 -0700 | [diff] [blame] | 978 | hcrx->ccid3hcrx_tstamp_last_ack = ktime_get_real(); |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 979 | hcrx->ccid3hcrx_s = 0; |
Gerrit Renker | fe0499a | 2006-12-10 00:06:01 -0200 | [diff] [blame] | 980 | hcrx->ccid3hcrx_rtt = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 981 | return 0; |
| 982 | } |
| 983 | |
| 984 | static void ccid3_hc_rx_exit(struct sock *sk) |
| 985 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 986 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 987 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 988 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 989 | |
| 990 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); |
| 991 | |
| 992 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 993 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 994 | |
| 995 | /* Empty loss interval history */ |
Arnaldo Carvalho de Melo | cc4d6a3 | 2007-05-28 18:53:08 -0300 | [diff] [blame] | 996 | dccp_li_hist_purge(&hcrx->ccid3hcrx_li_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 997 | } |
| 998 | |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 999 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
| 1000 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1001 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1002 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1003 | /* Listen socks doesn't have a private CCID block */ |
| 1004 | if (sk->sk_state == DCCP_LISTEN) |
| 1005 | return; |
| 1006 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1007 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1008 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 1009 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; |
| 1010 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; |
| 1011 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1012 | } |
| 1013 | |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1014 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
| 1015 | u32 __user *optval, int __user *optlen) |
| 1016 | { |
| 1017 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
| 1018 | const void *val; |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 1019 | |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1020 | /* Listen socks doesn't have a private CCID block */ |
| 1021 | if (sk->sk_state == DCCP_LISTEN) |
| 1022 | return -EINVAL; |
| 1023 | |
| 1024 | switch (optname) { |
| 1025 | case DCCP_SOCKOPT_CCID_RX_INFO: |
| 1026 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) |
| 1027 | return -EINVAL; |
| 1028 | len = sizeof(hcrx->ccid3hcrx_tfrc); |
| 1029 | val = &hcrx->ccid3hcrx_tfrc; |
| 1030 | break; |
| 1031 | default: |
| 1032 | return -ENOPROTOOPT; |
| 1033 | } |
| 1034 | |
| 1035 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1036 | return -EFAULT; |
| 1037 | |
| 1038 | return 0; |
| 1039 | } |
| 1040 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1041 | static struct ccid_operations ccid3 = { |
Ian McDonald | 3dd9a7c | 2006-09-22 14:26:44 +1200 | [diff] [blame] | 1042 | .ccid_id = DCCPC_CCID3, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1043 | .ccid_name = "ccid3", |
| 1044 | .ccid_owner = THIS_MODULE, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1045 | .ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock), |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1046 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
| 1047 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, |
| 1048 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, |
| 1049 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, |
| 1050 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1051 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1052 | .ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock), |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1053 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
| 1054 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, |
| 1055 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, |
| 1056 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1057 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
| 1058 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1059 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
| 1060 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1061 | }; |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 1062 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1063 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1064 | module_param(ccid3_debug, int, 0444); |
| 1065 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1066 | #endif |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1067 | |
| 1068 | static __init int ccid3_module_init(void) |
| 1069 | { |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1070 | int rc = -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1071 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1072 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
| 1073 | if (ccid3_rx_hist == NULL) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1074 | goto out; |
| 1075 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1076 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
| 1077 | if (ccid3_tx_hist == NULL) |
| 1078 | goto out_free_rx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1079 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1080 | rc = ccid_register(&ccid3); |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 1081 | if (rc != 0) |
Arnaldo Carvalho de Melo | cc4d6a3 | 2007-05-28 18:53:08 -0300 | [diff] [blame] | 1082 | goto out_free_tx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1083 | out: |
| 1084 | return rc; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1085 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1086 | out_free_tx: |
| 1087 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1088 | ccid3_tx_hist = NULL; |
| 1089 | out_free_rx: |
| 1090 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1091 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1092 | goto out; |
| 1093 | } |
| 1094 | module_init(ccid3_module_init); |
| 1095 | |
| 1096 | static __exit void ccid3_module_exit(void) |
| 1097 | { |
| 1098 | ccid_unregister(&ccid3); |
| 1099 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1100 | if (ccid3_tx_hist != NULL) { |
| 1101 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1102 | ccid3_tx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1103 | } |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1104 | if (ccid3_rx_hist != NULL) { |
| 1105 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1106 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1107 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1108 | } |
| 1109 | module_exit(ccid3_module_exit); |
| 1110 | |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 1111 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1112 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1113 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
| 1114 | MODULE_LICENSE("GPL"); |
| 1115 | MODULE_ALIAS("net-dccp-ccid-3"); |