Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/dccp/ccids/ccid3.c |
| 3 | * |
| 4 | * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand. |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 5 | * Copyright (c) 2005-6 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 | */ |
| 36 | |
| 37 | #include "../ccid.h" |
| 38 | #include "../dccp.h" |
Arnaldo Carvalho de Melo | 4524b25 | 2005-08-27 23:18:26 -0300 | [diff] [blame] | 39 | #include "lib/packet_history.h" |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 40 | #include "lib/loss_interval.h" |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 41 | #include "lib/tfrc.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 42 | #include "ccid3.h" |
| 43 | |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 44 | /* |
Arnaldo Carvalho de Melo | 0ba7a3b | 2005-09-09 02:28:47 -0300 | [diff] [blame] | 45 | * Reason for maths here is to avoid 32 bit overflow when a is big. |
| 46 | * With this we get close to the limit. |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 47 | */ |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 48 | static u32 usecs_div(const u32 a, const u32 b) |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 49 | { |
Arnaldo Carvalho de Melo | 0ba7a3b | 2005-09-09 02:28:47 -0300 | [diff] [blame] | 50 | const u32 div = a < (UINT_MAX / (USEC_PER_SEC / 10)) ? 10 : |
| 51 | a < (UINT_MAX / (USEC_PER_SEC / 50)) ? 50 : |
| 52 | a < (UINT_MAX / (USEC_PER_SEC / 100)) ? 100 : |
| 53 | a < (UINT_MAX / (USEC_PER_SEC / 500)) ? 500 : |
| 54 | a < (UINT_MAX / (USEC_PER_SEC / 1000)) ? 1000 : |
| 55 | a < (UINT_MAX / (USEC_PER_SEC / 5000)) ? 5000 : |
| 56 | a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 : |
| 57 | a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 : |
| 58 | 100000; |
| 59 | const u32 tmp = a * (USEC_PER_SEC / div); |
| 60 | return (b >= 2 * div) ? tmp / (b / div) : tmp; |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 61 | } |
| 62 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 63 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 64 | |
| 65 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
| 66 | static int ccid3_debug; |
| 67 | #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] | 68 | #else |
| 69 | #define ccid3_pr_debug(format, a...) |
| 70 | #endif |
| 71 | |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 72 | static struct dccp_tx_hist *ccid3_tx_hist; |
| 73 | static struct dccp_rx_hist *ccid3_rx_hist; |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 74 | static struct dccp_li_hist *ccid3_li_hist; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 75 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 76 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 77 | static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) |
| 78 | { |
| 79 | static char *ccid3_state_names[] = { |
| 80 | [TFRC_SSTATE_NO_SENT] = "NO_SENT", |
| 81 | [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", |
| 82 | [TFRC_SSTATE_FBACK] = "FBACK", |
| 83 | [TFRC_SSTATE_TERM] = "TERM", |
| 84 | }; |
| 85 | |
| 86 | return ccid3_state_names[state]; |
| 87 | } |
| 88 | #endif |
| 89 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 90 | static void ccid3_hc_tx_set_state(struct sock *sk, |
| 91 | enum ccid3_hc_tx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 92 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 93 | 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] | 94 | enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; |
| 95 | |
| 96 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 97 | dccp_role(sk), sk, ccid3_tx_state_name(oldstate), |
| 98 | ccid3_tx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 99 | WARN_ON(state == oldstate); |
| 100 | hctx->ccid3hctx_state = state; |
| 101 | } |
| 102 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 103 | /* |
| 104 | * Recalculate scheduled nominal send time t_nom, inter-packet interval |
| 105 | * t_ipi, and delta value. Should be called after each change to X. |
| 106 | */ |
| 107 | static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock *hctx) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 108 | { |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 109 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 110 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 111 | /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ |
| 112 | hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_x); |
| 113 | |
| 114 | /* Update nominal send time with regard to the new t_ipi */ |
| 115 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
| 116 | |
| 117 | /* 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] | 118 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
| 119 | TFRC_OPSYS_HALF_TIME_GRAN); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 120 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 121 | /* |
| 122 | * Update X by |
| 123 | * If (p > 0) |
| 124 | * x_calc = calcX(s, R, p); |
| 125 | * X = max(min(X_calc, 2 * X_recv), s / t_mbi); |
| 126 | * Else |
| 127 | * If (now - tld >= R) |
| 128 | * X = max(min(2 * X, 2 * X_recv), s / R); |
| 129 | * tld = now; |
| 130 | */ |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame^] | 131 | static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) |
| 132 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 133 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 134 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 135 | const __u32 old_x = hctx->ccid3hctx_x; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 136 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 137 | /* To avoid large error in calcX */ |
| 138 | if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 139 | hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, |
| 140 | hctx->ccid3hctx_rtt, |
| 141 | hctx->ccid3hctx_p); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame^] | 142 | hctx->ccid3hctx_x = max_t(u32, min(hctx->ccid3hctx_x_calc, |
| 143 | hctx->ccid3hctx_x_recv * 2), |
| 144 | hctx->ccid3hctx_s / TFRC_T_MBI); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 145 | |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame^] | 146 | } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) >= |
| 147 | hctx->ccid3hctx_rtt) { |
| 148 | hctx->ccid3hctx_x = max(min(hctx->ccid3hctx_x_recv, |
| 149 | hctx->ccid3hctx_x ) * 2, |
| 150 | usecs_div(hctx->ccid3hctx_s, |
| 151 | hctx->ccid3hctx_rtt) ); |
| 152 | hctx->ccid3hctx_t_ld = *now; |
| 153 | } else |
| 154 | ccid3_pr_debug("Not changing X\n"); |
| 155 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 156 | if (hctx->ccid3hctx_x != old_x) |
| 157 | ccid3_update_send_time(hctx); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 158 | } |
| 159 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 160 | /* |
| 161 | * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) |
| 162 | * @len: DCCP packet payload size in bytes |
| 163 | */ |
| 164 | static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) |
| 165 | { |
| 166 | if (unlikely(len == 0)) |
| 167 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); |
| 168 | else |
| 169 | hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : |
| 170 | (9 * hctx->ccid3hctx_s + len) / 10; |
| 171 | /* |
| 172 | * Note: We could do a potential optimisation here - when `s' changes, |
| 173 | * recalculate sending rate and consequently t_ipi, t_delta, and |
| 174 | * t_now. This is however non-standard, and the benefits are not |
| 175 | * clear, so it is currently left out. |
| 176 | */ |
| 177 | } |
| 178 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 179 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
| 180 | { |
| 181 | struct sock *sk = (struct sock *)data; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 182 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 183 | unsigned long t_nfb = USEC_PER_SEC / 5; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 184 | |
| 185 | bh_lock_sock(sk); |
| 186 | if (sock_owned_by_user(sk)) { |
| 187 | /* Try again later. */ |
| 188 | /* XXX: set some sensible MIB */ |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 189 | goto restart_timer; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, |
| 193 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
| 194 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 195 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 196 | case TFRC_SSTATE_NO_FBACK: |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame^] | 197 | /* RFC 3448, 4.4: Halve send rate directly */ |
| 198 | hctx->ccid3hctx_x = min_t(u32, hctx->ccid3hctx_x / 2, |
| 199 | hctx->ccid3hctx_s / TFRC_T_MBI); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 200 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 201 | ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " |
| 202 | "bytes/s\n", |
| 203 | dccp_role(sk), sk, |
| 204 | ccid3_tx_state_name(hctx->ccid3hctx_state), |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 205 | hctx->ccid3hctx_x); |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 206 | /* The value of R is still undefined and so we can not recompute |
| 207 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 208 | t_nfb = TFRC_INITIAL_TIMEOUT; |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 209 | ccid3_update_send_time(hctx); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 210 | break; |
| 211 | case TFRC_SSTATE_FBACK: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 212 | /* |
| 213 | * Check if IDLE since last timeout and recv rate is less than |
| 214 | * 4 packets per RTT |
| 215 | */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 216 | if (!hctx->ccid3hctx_idle || |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 217 | (hctx->ccid3hctx_x_recv >= |
| 218 | 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame^] | 219 | struct timeval now; |
| 220 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 221 | ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", |
| 222 | dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 223 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
| 224 | /* Halve sending rate */ |
| 225 | |
| 226 | /* If (X_calc > 2 * X_recv) |
| 227 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); |
| 228 | * Else |
| 229 | * X_recv = X_calc / 4; |
| 230 | */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 231 | BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && |
| 232 | hctx->ccid3hctx_x_calc == 0); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 233 | |
| 234 | /* check also if p is zero -> x_calc is infinity? */ |
| 235 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || |
| 236 | hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) |
| 237 | hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame^] | 238 | hctx->ccid3hctx_s / (2 * TFRC_T_MBI)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 239 | else |
| 240 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; |
| 241 | |
| 242 | /* Update sending rate */ |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame^] | 243 | dccp_timestamp(sk, &now); |
| 244 | ccid3_hc_tx_update_x(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 245 | } |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 246 | /* |
| 247 | * Schedule no feedback timer to expire in |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 248 | * max(4 * R, 2 * s/X) = max(4 * R, 2 * t_ipi) |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 249 | */ |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 250 | t_nfb = max(4 * hctx->ccid3hctx_rtt, 2 * hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 251 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 252 | case TFRC_SSTATE_NO_SENT: |
| 253 | DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); |
| 254 | /* fall through */ |
| 255 | case TFRC_SSTATE_TERM: |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 256 | goto out; |
| 257 | } |
| 258 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 259 | hctx->ccid3hctx_idle = 1; |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 260 | |
| 261 | restart_timer: |
| 262 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 263 | jiffies + usecs_to_jiffies(t_nfb)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 264 | out: |
| 265 | bh_unlock_sock(sk); |
| 266 | sock_put(sk); |
| 267 | } |
| 268 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 269 | /* |
| 270 | * returns |
| 271 | * > 0: delay (in msecs) that should pass before actually sending |
| 272 | * = 0: can send immediately |
| 273 | * < 0: error condition; do not send packet |
| 274 | */ |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 275 | static int ccid3_hc_tx_send_packet(struct sock *sk, |
| 276 | struct sk_buff *skb, int len) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 277 | { |
| 278 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 279 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 280 | struct dccp_tx_hist_entry *new_packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 281 | struct timeval now; |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 282 | long delay; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 283 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 284 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 285 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 286 | /* |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 287 | * This function is called only for Data and DataAck packets. Sending |
| 288 | * zero-sized Data(Ack)s is theoretically possible, but for congestion |
| 289 | * control this case is pathological - ignore it. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 290 | */ |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 291 | if (unlikely(len == 0)) |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 292 | return -EBADMSG; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 293 | |
| 294 | /* See if last packet allocated was not sent */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 295 | new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
| 296 | if (new_packet == NULL || new_packet->dccphtx_sent) { |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 297 | new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, |
| 298 | SLAB_ATOMIC); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 299 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 300 | if (unlikely(new_packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 301 | DCCP_WARN("%s, sk=%p, not enough mem to add to history," |
| 302 | "send refused\n", dccp_role(sk), sk); |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 303 | return -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 304 | } |
| 305 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 306 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 307 | } |
| 308 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 309 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 310 | |
| 311 | switch (hctx->ccid3hctx_state) { |
| 312 | case TFRC_SSTATE_NO_SENT: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 313 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
| 314 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 315 | hctx->ccid3hctx_last_win_count = 0; |
| 316 | hctx->ccid3hctx_t_last_win_count = now; |
| 317 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 318 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 319 | /* Set initial sending rate to 1 packet per second */ |
| 320 | ccid3_hc_tx_update_s(hctx, len); |
| 321 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; |
| 322 | |
Gerrit Renker | 90feeb9 | 2006-11-27 12:13:38 -0200 | [diff] [blame] | 323 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
| 324 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; |
| 325 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ |
| 326 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; |
| 327 | |
| 328 | /* Set t_0 for initial packet */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 329 | hctx->ccid3hctx_t_nom = now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 330 | break; |
| 331 | case TFRC_SSTATE_NO_FBACK: |
| 332 | case TFRC_SSTATE_FBACK: |
Gerrit Renker | 91cf5a1 | 2006-11-27 12:25:10 -0200 | [diff] [blame] | 333 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
| 334 | /* |
| 335 | * Scheduling of packet transmissions [RFC 3448, 4.6] |
| 336 | * |
| 337 | * if (t_now > t_nom - delta) |
| 338 | * // send the packet now |
| 339 | * else |
| 340 | * // send the packet in (t_nom - t_now) milliseconds. |
| 341 | */ |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 342 | if (delay >= hctx->ccid3hctx_delta) |
| 343 | return delay / 1000L; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 344 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 345 | case TFRC_SSTATE_TERM: |
| 346 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 347 | return -EINVAL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 348 | } |
| 349 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 350 | /* prepare to send now (add options etc.) */ |
| 351 | dp->dccps_hc_tx_insert_options = 1; |
| 352 | new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = |
| 353 | hctx->ccid3hctx_last_win_count; |
| 354 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
| 355 | |
| 356 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) |
| 360 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 361 | const struct dccp_sock *dp = dccp_sk(sk); |
| 362 | 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] | 363 | struct timeval now; |
| 364 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 365 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 366 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 367 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 368 | |
| 369 | /* check if we have sent a data packet */ |
| 370 | if (len > 0) { |
| 371 | unsigned long quarter_rtt; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 372 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 373 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 374 | ccid3_hc_tx_update_s(hctx, len); |
| 375 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 376 | packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 377 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 378 | DCCP_WARN("packet doesn't exist in history!\n"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 379 | return; |
| 380 | } |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 381 | if (unlikely(packet->dccphtx_sent)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 382 | DCCP_WARN("no unsent packet in history!\n"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 383 | return; |
| 384 | } |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 385 | packet->dccphtx_tstamp = now; |
| 386 | packet->dccphtx_seqno = dp->dccps_gss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 387 | /* |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 388 | * Check if win_count have changed |
Gerrit Renker | 0e64e94 | 2006-10-24 16:17:51 -0700 | [diff] [blame] | 389 | * Algorithm in "8.1. Window Counter Value" in RFC 4342. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 390 | */ |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 391 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); |
| 392 | if (likely(hctx->ccid3hctx_rtt > 8)) |
| 393 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; |
| 394 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 395 | if (quarter_rtt > 0) { |
| 396 | hctx->ccid3hctx_t_last_win_count = now; |
| 397 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + |
| 398 | min_t(unsigned long, quarter_rtt, 5)) % 16; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 399 | ccid3_pr_debug("%s, sk=%p, window changed from " |
| 400 | "%u to %u!\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 401 | dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 402 | packet->dccphtx_ccval, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 403 | hctx->ccid3hctx_last_win_count); |
| 404 | } |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 405 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 406 | hctx->ccid3hctx_idle = 0; |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 407 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 408 | packet->dccphtx_sent = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 409 | } else |
| 410 | ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", |
| 411 | dccp_role(sk), sk, dp->dccps_gss); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 412 | } |
| 413 | |
| 414 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 415 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 416 | const struct dccp_sock *dp = dccp_sk(sk); |
| 417 | 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] | 418 | struct ccid3_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 419 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 420 | struct timeval now; |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 421 | unsigned long t_nfb; |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 422 | u32 t_elapsed; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 423 | u32 pinv; |
| 424 | u32 x_recv; |
| 425 | u32 r_sample; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 426 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 427 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 428 | |
| 429 | /* we are only interested in ACKs */ |
| 430 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || |
| 431 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) |
| 432 | return; |
| 433 | |
| 434 | opt_recv = &hctx->ccid3hctx_options_received; |
| 435 | |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 436 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 437 | x_recv = opt_recv->ccid3or_receive_rate; |
| 438 | pinv = opt_recv->ccid3or_loss_event_rate; |
| 439 | |
| 440 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 441 | case TFRC_SSTATE_NO_FBACK: |
| 442 | case TFRC_SSTATE_FBACK: |
| 443 | /* Calculate new round trip sample by |
| 444 | * R_sample = (now - t_recvdata) - t_delay */ |
| 445 | /* get t_recvdata from history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 446 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
| 447 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 448 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 449 | DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " |
| 450 | "in history!\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 451 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 452 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 453 | return; |
| 454 | } |
| 455 | |
| 456 | /* Update RTT */ |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 457 | dccp_timestamp(sk, &now); |
| 458 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 459 | if (unlikely(r_sample <= t_elapsed)) |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 460 | DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", |
| 461 | r_sample, t_elapsed); |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 462 | else |
| 463 | r_sample -= t_elapsed; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 464 | |
| 465 | /* Update RTT estimate by |
| 466 | * If (No feedback recv) |
| 467 | * R = R_sample; |
| 468 | * Else |
| 469 | * R = q * R + (1 - q) * R_sample; |
| 470 | * |
| 471 | * q is a constant, RFC 3448 recomments 0.9 |
| 472 | */ |
| 473 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame^] | 474 | /* Use Larger Initial Windows [RFC 4342, sec. 5] |
| 475 | * We deviate in that we use `s' instead of `MSS'. */ |
| 476 | u16 w_init = max( 4 * hctx->ccid3hctx_s, |
| 477 | max(2 * hctx->ccid3hctx_s, 4380)); |
| 478 | hctx->ccid3hctx_rtt = r_sample; |
| 479 | hctx->ccid3hctx_x = usecs_div(w_init, r_sample); |
| 480 | hctx->ccid3hctx_t_ld = now; |
| 481 | |
| 482 | ccid3_update_send_time(hctx); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 483 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame^] | 484 | } else { |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 485 | hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + |
| 486 | r_sample / 10; |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame^] | 487 | ccid3_hc_tx_update_x(sk, &now); |
| 488 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 489 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 490 | ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " |
| 491 | "r_sample=%us\n", dccp_role(sk), sk, |
| 492 | hctx->ccid3hctx_rtt, r_sample); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 493 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 494 | /* Update receive rate */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 495 | hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 496 | |
| 497 | /* Update loss event rate */ |
| 498 | if (pinv == ~0 || pinv == 0) |
| 499 | hctx->ccid3hctx_p = 0; |
| 500 | else { |
| 501 | hctx->ccid3hctx_p = 1000000 / pinv; |
| 502 | |
| 503 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { |
| 504 | hctx->ccid3hctx_p = TFRC_SMALLEST_P; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 505 | ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", |
| 506 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 507 | } |
| 508 | } |
| 509 | |
| 510 | /* unschedule no feedback timer */ |
| 511 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 512 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 513 | /* remove all packets older than the one acked from history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 514 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
| 515 | &hctx->ccid3hctx_hist, packet); |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 516 | /* |
| 517 | * As we have calculated new ipi, delta, t_nom it is possible that |
Gerrit Renker | 5d0dbc4 | 2006-11-27 20:32:37 -0200 | [diff] [blame] | 518 | * 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] | 519 | */ |
| 520 | sk->sk_write_space(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 521 | |
Gerrit Renker | 5d0dbc4 | 2006-11-27 20:32:37 -0200 | [diff] [blame] | 522 | /* Update timeout interval. We use the alternative variant of |
| 523 | * [RFC 3448, 3.1] which sets the upper bound of t_rto to one |
| 524 | * second, as it is suggested for TCP (see RFC 2988, 2.4). */ |
| 525 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
| 526 | USEC_PER_SEC ); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 527 | /* |
| 528 | * Schedule no feedback timer to expire in |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 529 | * max(4 * R, 2 * s/X) = max(4 * R, 2 * t_ipi) |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 530 | */ |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 531 | t_nfb = max(4 * hctx->ccid3hctx_rtt, 2 * hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 532 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 533 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
| 534 | "expire in %lu jiffies (%luus)\n", |
| 535 | dccp_role(sk), sk, |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 536 | usecs_to_jiffies(t_nfb), t_nfb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 537 | |
| 538 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 539 | jiffies + usecs_to_jiffies(t_nfb)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 540 | |
| 541 | /* set idle flag */ |
| 542 | hctx->ccid3hctx_idle = 1; |
| 543 | break; |
Gerrit Renker | 5e19e3f | 2006-11-27 12:28:48 -0200 | [diff] [blame] | 544 | case TFRC_SSTATE_NO_SENT: |
| 545 | DCCP_WARN("Illegal ACK received - no packet has been sent\n"); |
| 546 | /* fall through */ |
| 547 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 548 | break; |
| 549 | } |
| 550 | } |
| 551 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 552 | static int ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 553 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 554 | 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] | 555 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 556 | BUG_ON(hctx == NULL); |
| 557 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 558 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
| 559 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; |
| 560 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 561 | } |
| 562 | |
| 563 | 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] | 564 | unsigned char len, u16 idx, |
| 565 | unsigned char *value) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 566 | { |
| 567 | int rc = 0; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 568 | const struct dccp_sock *dp = dccp_sk(sk); |
| 569 | 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] | 570 | struct ccid3_options_received *opt_recv; |
| 571 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 572 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 573 | |
| 574 | opt_recv = &hctx->ccid3hctx_options_received; |
| 575 | |
| 576 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { |
| 577 | opt_recv->ccid3or_seqno = dp->dccps_gsr; |
| 578 | opt_recv->ccid3or_loss_event_rate = ~0; |
| 579 | opt_recv->ccid3or_loss_intervals_idx = 0; |
| 580 | opt_recv->ccid3or_loss_intervals_len = 0; |
| 581 | opt_recv->ccid3or_receive_rate = 0; |
| 582 | } |
| 583 | |
| 584 | switch (option) { |
| 585 | case TFRC_OPT_LOSS_EVENT_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 586 | if (unlikely(len != 4)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 587 | DCCP_WARN("%s, sk=%p, invalid len %d " |
| 588 | "for TFRC_OPT_LOSS_EVENT_RATE\n", |
| 589 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 590 | rc = -EINVAL; |
| 591 | } else { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 592 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 593 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
| 594 | dccp_role(sk), sk, |
| 595 | opt_recv->ccid3or_loss_event_rate); |
| 596 | } |
| 597 | break; |
| 598 | case TFRC_OPT_LOSS_INTERVALS: |
| 599 | opt_recv->ccid3or_loss_intervals_idx = idx; |
| 600 | opt_recv->ccid3or_loss_intervals_len = len; |
| 601 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", |
| 602 | dccp_role(sk), sk, |
| 603 | opt_recv->ccid3or_loss_intervals_idx, |
| 604 | opt_recv->ccid3or_loss_intervals_len); |
| 605 | break; |
| 606 | case TFRC_OPT_RECEIVE_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 607 | if (unlikely(len != 4)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 608 | DCCP_WARN("%s, sk=%p, invalid len %d " |
| 609 | "for TFRC_OPT_RECEIVE_RATE\n", |
| 610 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 611 | rc = -EINVAL; |
| 612 | } else { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 613 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 614 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
| 615 | dccp_role(sk), sk, |
| 616 | opt_recv->ccid3or_receive_rate); |
| 617 | } |
| 618 | break; |
| 619 | } |
| 620 | |
| 621 | return rc; |
| 622 | } |
| 623 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 624 | 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] | 625 | { |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 626 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 627 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 628 | hctx->ccid3hctx_s = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 629 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
| 630 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | aa5d7df | 2006-03-20 17:35:13 -0800 | [diff] [blame] | 631 | |
| 632 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; |
| 633 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 634 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
| 635 | |
| 636 | return 0; |
| 637 | } |
| 638 | |
| 639 | static void ccid3_hc_tx_exit(struct sock *sk) |
| 640 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 641 | 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] | 642 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 643 | BUG_ON(hctx == NULL); |
| 644 | |
| 645 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); |
| 646 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 647 | |
| 648 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 649 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 650 | } |
| 651 | |
| 652 | /* |
| 653 | * RX Half Connection methods |
| 654 | */ |
| 655 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 656 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 657 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
| 658 | { |
| 659 | static char *ccid3_rx_state_names[] = { |
| 660 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", |
| 661 | [TFRC_RSTATE_DATA] = "DATA", |
| 662 | [TFRC_RSTATE_TERM] = "TERM", |
| 663 | }; |
| 664 | |
| 665 | return ccid3_rx_state_names[state]; |
| 666 | } |
| 667 | #endif |
| 668 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 669 | static void ccid3_hc_rx_set_state(struct sock *sk, |
| 670 | enum ccid3_hc_rx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 671 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 672 | 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] | 673 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
| 674 | |
| 675 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 676 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
| 677 | ccid3_rx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 678 | WARN_ON(state == oldstate); |
| 679 | hcrx->ccid3hcrx_state = state; |
| 680 | } |
| 681 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 682 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
| 683 | { |
| 684 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ |
| 685 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); |
| 686 | else |
| 687 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : |
| 688 | (9 * hcrx->ccid3hcrx_s + len) / 10; |
| 689 | } |
| 690 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 691 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
| 692 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 693 | 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] | 694 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 695 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 696 | struct timeval now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 697 | |
| 698 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); |
| 699 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 700 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 701 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 702 | switch (hcrx->ccid3hcrx_state) { |
| 703 | case TFRC_RSTATE_NO_DATA: |
| 704 | hcrx->ccid3hcrx_x_recv = 0; |
| 705 | break; |
| 706 | case TFRC_RSTATE_DATA: { |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 707 | const u32 delta = timeval_delta(&now, |
| 708 | &hcrx->ccid3hcrx_tstamp_last_feedback); |
Arnaldo Carvalho de Melo | 27ae543e | 2005-09-09 02:31:07 -0300 | [diff] [blame] | 709 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
| 710 | delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 711 | } |
| 712 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 713 | case TFRC_RSTATE_TERM: |
| 714 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 715 | return; |
| 716 | } |
| 717 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 718 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 719 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 720 | DCCP_WARN("%s, sk=%p, no data packet in history!\n", |
| 721 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 722 | return; |
| 723 | } |
| 724 | |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 725 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 726 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 727 | hcrx->ccid3hcrx_bytes_recv = 0; |
| 728 | |
| 729 | /* Convert to multiples of 10us */ |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 730 | hcrx->ccid3hcrx_elapsed_time = |
| 731 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 732 | if (hcrx->ccid3hcrx_p == 0) |
| 733 | hcrx->ccid3hcrx_pinv = ~0; |
| 734 | else |
| 735 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 736 | dp->dccps_hc_rx_insert_options = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 737 | dccp_send_ack(sk); |
| 738 | } |
| 739 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 740 | 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] | 741 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 742 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 743 | __be32 x_recv, pinv; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 744 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 745 | BUG_ON(hcrx == NULL); |
| 746 | |
| 747 | 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] | 748 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 749 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 750 | 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] | 751 | |
| 752 | if (dccp_packet_without_ack(skb)) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 753 | return 0; |
| 754 | |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 755 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
| 756 | pinv = htonl(hcrx->ccid3hcrx_pinv); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 757 | |
| 758 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && |
| 759 | dccp_insert_option_elapsed_time(sk, skb, |
| 760 | hcrx->ccid3hcrx_elapsed_time)) || |
| 761 | dccp_insert_option_timestamp(sk, skb) || |
| 762 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, |
| 763 | &pinv, sizeof(pinv)) || |
| 764 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, |
| 765 | &x_recv, sizeof(x_recv))) |
| 766 | return -1; |
| 767 | |
| 768 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 769 | } |
| 770 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 771 | /* calculate first loss interval |
| 772 | * |
| 773 | * returns estimated loss interval in usecs */ |
| 774 | |
| 775 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) |
| 776 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 777 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 778 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 779 | u32 rtt, delta, x_recv, fval, p, tmp2; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 780 | struct timeval tstamp = { 0, }; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 781 | int interval = 0; |
| 782 | int win_count = 0; |
| 783 | int step = 0; |
| 784 | u64 tmp1; |
| 785 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 786 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
| 787 | dccphrx_node) { |
| 788 | if (dccp_rx_hist_entry_data_packet(entry)) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 789 | tail = entry; |
| 790 | |
| 791 | switch (step) { |
| 792 | case 0: |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 793 | tstamp = entry->dccphrx_tstamp; |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 794 | win_count = entry->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 795 | step = 1; |
| 796 | break; |
| 797 | case 1: |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 798 | interval = win_count - entry->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 799 | if (interval < 0) |
| 800 | interval += TFRC_WIN_COUNT_LIMIT; |
| 801 | if (interval > 4) |
| 802 | goto found; |
| 803 | break; |
| 804 | } |
| 805 | } |
| 806 | } |
| 807 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 808 | if (unlikely(step == 0)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 809 | DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", |
| 810 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 811 | return ~0; |
| 812 | } |
| 813 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 814 | if (unlikely(interval == 0)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 815 | DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." |
| 816 | "Defaulting to 1\n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 817 | interval = 1; |
| 818 | } |
| 819 | found: |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 820 | if (!tail) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 821 | DCCP_CRIT("tail is null\n"); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 822 | return ~0; |
| 823 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 824 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 825 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
| 826 | dccp_role(sk), sk, rtt); |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 827 | |
| 828 | if (rtt == 0) { |
| 829 | DCCP_WARN("RTT==0, setting to 1\n"); |
| 830 | rtt = 1; |
| 831 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 832 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 833 | dccp_timestamp(sk, &tstamp); |
| 834 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); |
| 835 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 836 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 837 | if (x_recv == 0) |
| 838 | x_recv = hcrx->ccid3hcrx_x_recv; |
| 839 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 840 | tmp1 = (u64)x_recv * (u64)rtt; |
| 841 | do_div(tmp1,10000000); |
| 842 | tmp2 = (u32)tmp1; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 843 | |
| 844 | if (!tmp2) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 845 | DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 846 | return ~0; |
| 847 | } |
| 848 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 849 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
| 850 | /* do not alter order above or you will get overflow on 32 bit */ |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 851 | p = tfrc_calc_x_reverse_lookup(fval); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 852 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
| 853 | "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 854 | |
| 855 | if (p == 0) |
| 856 | return ~0; |
| 857 | else |
| 858 | return 1000000 / p; |
| 859 | } |
| 860 | |
| 861 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) |
| 862 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 863 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 864 | struct dccp_li_hist_entry *head; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 865 | u64 seq_temp; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 866 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 867 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 868 | if (!dccp_li_hist_interval_new(ccid3_li_hist, |
| 869 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 870 | return; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 871 | |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 872 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
| 873 | struct dccp_li_hist_entry, dccplih_node); |
| 874 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 875 | } else { |
| 876 | struct dccp_li_hist_entry *entry; |
| 877 | struct list_head *tail; |
| 878 | |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 879 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
| 880 | struct dccp_li_hist_entry, dccplih_node); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 881 | /* FIXME win count check removed as was wrong */ |
| 882 | /* should make this check with receive history */ |
| 883 | /* and compare there as per section 10.2 of RFC4342 */ |
| 884 | |
| 885 | /* new loss event detected */ |
| 886 | /* calculate last interval length */ |
| 887 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); |
| 888 | entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); |
| 889 | |
| 890 | if (entry == NULL) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 891 | DCCP_BUG("out of memory - can not allocate entry"); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 892 | return; |
| 893 | } |
| 894 | |
| 895 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); |
| 896 | |
| 897 | tail = hcrx->ccid3hcrx_li_hist.prev; |
| 898 | list_del(tail); |
| 899 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); |
| 900 | |
| 901 | /* Create the newest interval */ |
| 902 | entry->dccplih_seqno = seq_loss; |
| 903 | entry->dccplih_interval = seq_temp; |
| 904 | entry->dccplih_win_count = win_loss; |
| 905 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 906 | } |
| 907 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 908 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
| 909 | struct dccp_rx_hist_entry *packet) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 910 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 911 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 912 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
| 913 | u64 seqno = packet->dccphrx_seqno; |
| 914 | u64 tmp_seqno; |
| 915 | int loss = 0; |
| 916 | u8 ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 917 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 918 | |
| 919 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 920 | |
| 921 | if (!rx_hist || |
| 922 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 923 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 924 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 925 | goto detect_out; |
| 926 | } |
| 927 | |
| 928 | |
| 929 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
| 930 | > TFRC_RECV_NUM_LATE_LOSS) { |
| 931 | loss = 1; |
| 932 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, |
| 933 | hcrx->ccid3hcrx_ccval_nonloss); |
| 934 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 935 | dccp_inc_seqno(&tmp_seqno); |
| 936 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 937 | dccp_inc_seqno(&tmp_seqno); |
| 938 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, |
| 939 | tmp_seqno, &ccval)) { |
| 940 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 941 | hcrx->ccid3hcrx_ccval_nonloss = ccval; |
| 942 | dccp_inc_seqno(&tmp_seqno); |
| 943 | } |
| 944 | } |
| 945 | |
| 946 | /* FIXME - this code could be simplified with above while */ |
| 947 | /* but works at moment */ |
| 948 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 949 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 950 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 951 | } |
| 952 | |
| 953 | detect_out: |
| 954 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, |
| 955 | &hcrx->ccid3hcrx_li_hist, packet, |
| 956 | hcrx->ccid3hcrx_seqno_nonloss); |
| 957 | return loss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 958 | } |
| 959 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 960 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 961 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 962 | 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] | 963 | const struct dccp_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 964 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 965 | struct timeval now; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 966 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 967 | int loss, payload_size; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 968 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 969 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 970 | |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 971 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 972 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 973 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
| 974 | case DCCP_PKT_ACK: |
| 975 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 976 | return; |
| 977 | case DCCP_PKT_DATAACK: |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 978 | if (opt_recv->dccpor_timestamp_echo == 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 979 | break; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 980 | rtt_prev = hcrx->ccid3hcrx_rtt; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 981 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 982 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
| 983 | r_sample = timeval_usecs(&now); |
| 984 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; |
| 985 | |
| 986 | if (unlikely(r_sample <= t_elapsed)) |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 987 | DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", |
| 988 | r_sample, t_elapsed); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 989 | else |
| 990 | r_sample -= t_elapsed; |
| 991 | |
| 992 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 993 | hcrx->ccid3hcrx_rtt = r_sample; |
| 994 | else |
| 995 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + |
| 996 | r_sample / 10; |
| 997 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 998 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
| 999 | ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n", |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1000 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
| 1001 | opt_recv->dccpor_elapsed_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1002 | break; |
| 1003 | case DCCP_PKT_DATA: |
| 1004 | break; |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1005 | 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] | 1006 | return; |
| 1007 | } |
| 1008 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1009 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1010 | skb, SLAB_ATOMIC); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1011 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1012 | DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " |
| 1013 | "to history, consider it lost!\n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1014 | return; |
| 1015 | } |
| 1016 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1017 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1018 | |
| 1019 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) |
| 1020 | return; |
| 1021 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 1022 | payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; |
| 1023 | ccid3_hc_rx_update_s(hcrx, payload_size); |
| 1024 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1025 | switch (hcrx->ccid3hcrx_state) { |
| 1026 | case TFRC_RSTATE_NO_DATA: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1027 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
| 1028 | "feedback\n", |
| 1029 | dccp_role(sk), sk, |
| 1030 | dccp_state_name(sk->sk_state), skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1031 | ccid3_hc_rx_send_feedback(sk); |
| 1032 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); |
| 1033 | return; |
| 1034 | case TFRC_RSTATE_DATA: |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 1035 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1036 | if (loss) |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1037 | break; |
| 1038 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1039 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1040 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
| 1041 | hcrx->ccid3hcrx_rtt) { |
| 1042 | hcrx->ccid3hcrx_tstamp_last_ack = now; |
| 1043 | ccid3_hc_rx_send_feedback(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1044 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1045 | return; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1046 | case TFRC_RSTATE_TERM: |
| 1047 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1048 | return; |
| 1049 | } |
| 1050 | |
| 1051 | /* Dealing with packet loss */ |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1052 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
| 1053 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1054 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1055 | p_prev = hcrx->ccid3hcrx_p; |
| 1056 | |
| 1057 | /* Calculate loss event rate */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1058 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 1059 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); |
| 1060 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1061 | /* Scaling up by 1000000 as fixed decimal */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1062 | if (i_mean != 0) |
| 1063 | hcrx->ccid3hcrx_p = 1000000 / i_mean; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1064 | } else |
| 1065 | DCCP_BUG("empty loss history"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1066 | |
| 1067 | if (hcrx->ccid3hcrx_p > p_prev) { |
| 1068 | ccid3_hc_rx_send_feedback(sk); |
| 1069 | return; |
| 1070 | } |
| 1071 | } |
| 1072 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1073 | 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] | 1074 | { |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1075 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1076 | |
| 1077 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); |
| 1078 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1079 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
| 1080 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1081 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1082 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
Arnaldo Carvalho de Melo | 954ee31 | 2005-09-09 02:37:05 -0300 | [diff] [blame] | 1083 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 1084 | hcrx->ccid3hcrx_s = 0; |
Arnaldo Carvalho de Melo | 954ee31 | 2005-09-09 02:37:05 -0300 | [diff] [blame] | 1085 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1086 | return 0; |
| 1087 | } |
| 1088 | |
| 1089 | static void ccid3_hc_rx_exit(struct sock *sk) |
| 1090 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1091 | 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] | 1092 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1093 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1094 | |
| 1095 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); |
| 1096 | |
| 1097 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1098 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1099 | |
| 1100 | /* Empty loss interval history */ |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1101 | dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1102 | } |
| 1103 | |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1104 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
| 1105 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1106 | 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] | 1107 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1108 | /* Listen socks doesn't have a private CCID block */ |
| 1109 | if (sk->sk_state == DCCP_LISTEN) |
| 1110 | return; |
| 1111 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1112 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1113 | |
| 1114 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; |
| 1115 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; |
| 1116 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; |
| 1117 | } |
| 1118 | |
| 1119 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) |
| 1120 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1121 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1122 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1123 | /* Listen socks doesn't have a private CCID block */ |
| 1124 | if (sk->sk_state == DCCP_LISTEN) |
| 1125 | return; |
| 1126 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1127 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1128 | |
| 1129 | info->tcpi_rto = hctx->ccid3hctx_t_rto; |
| 1130 | info->tcpi_rtt = hctx->ccid3hctx_rtt; |
| 1131 | } |
| 1132 | |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1133 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
| 1134 | u32 __user *optval, int __user *optlen) |
| 1135 | { |
| 1136 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
| 1137 | const void *val; |
| 1138 | |
| 1139 | /* Listen socks doesn't have a private CCID block */ |
| 1140 | if (sk->sk_state == DCCP_LISTEN) |
| 1141 | return -EINVAL; |
| 1142 | |
| 1143 | switch (optname) { |
| 1144 | case DCCP_SOCKOPT_CCID_RX_INFO: |
| 1145 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) |
| 1146 | return -EINVAL; |
| 1147 | len = sizeof(hcrx->ccid3hcrx_tfrc); |
| 1148 | val = &hcrx->ccid3hcrx_tfrc; |
| 1149 | break; |
| 1150 | default: |
| 1151 | return -ENOPROTOOPT; |
| 1152 | } |
| 1153 | |
| 1154 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1155 | return -EFAULT; |
| 1156 | |
| 1157 | return 0; |
| 1158 | } |
| 1159 | |
| 1160 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, |
| 1161 | u32 __user *optval, int __user *optlen) |
| 1162 | { |
| 1163 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
| 1164 | const void *val; |
| 1165 | |
| 1166 | /* Listen socks doesn't have a private CCID block */ |
| 1167 | if (sk->sk_state == DCCP_LISTEN) |
| 1168 | return -EINVAL; |
| 1169 | |
| 1170 | switch (optname) { |
| 1171 | case DCCP_SOCKOPT_CCID_TX_INFO: |
| 1172 | if (len < sizeof(hctx->ccid3hctx_tfrc)) |
| 1173 | return -EINVAL; |
| 1174 | len = sizeof(hctx->ccid3hctx_tfrc); |
| 1175 | val = &hctx->ccid3hctx_tfrc; |
| 1176 | break; |
| 1177 | default: |
| 1178 | return -ENOPROTOOPT; |
| 1179 | } |
| 1180 | |
| 1181 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1182 | return -EFAULT; |
| 1183 | |
| 1184 | return 0; |
| 1185 | } |
| 1186 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1187 | static struct ccid_operations ccid3 = { |
Ian McDonald | 3dd9a7c | 2006-09-22 14:26:44 +1200 | [diff] [blame] | 1188 | .ccid_id = DCCPC_CCID3, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1189 | .ccid_name = "ccid3", |
| 1190 | .ccid_owner = THIS_MODULE, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1191 | .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] | 1192 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
| 1193 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, |
| 1194 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, |
| 1195 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, |
| 1196 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, |
| 1197 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, |
| 1198 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1199 | .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] | 1200 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
| 1201 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, |
| 1202 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, |
| 1203 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1204 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
| 1205 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1206 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
| 1207 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1208 | }; |
| 1209 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1210 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1211 | module_param(ccid3_debug, int, 0444); |
| 1212 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1213 | #endif |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1214 | |
| 1215 | static __init int ccid3_module_init(void) |
| 1216 | { |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1217 | int rc = -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1218 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1219 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
| 1220 | if (ccid3_rx_hist == NULL) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1221 | goto out; |
| 1222 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1223 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
| 1224 | if (ccid3_tx_hist == NULL) |
| 1225 | goto out_free_rx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1226 | |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1227 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
| 1228 | if (ccid3_li_hist == NULL) |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1229 | goto out_free_tx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1230 | |
| 1231 | rc = ccid_register(&ccid3); |
| 1232 | if (rc != 0) |
| 1233 | goto out_free_loss_interval_history; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1234 | out: |
| 1235 | return rc; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1236 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1237 | out_free_loss_interval_history: |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1238 | dccp_li_hist_delete(ccid3_li_hist); |
| 1239 | ccid3_li_hist = NULL; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1240 | out_free_tx: |
| 1241 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1242 | ccid3_tx_hist = NULL; |
| 1243 | out_free_rx: |
| 1244 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1245 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1246 | goto out; |
| 1247 | } |
| 1248 | module_init(ccid3_module_init); |
| 1249 | |
| 1250 | static __exit void ccid3_module_exit(void) |
| 1251 | { |
| 1252 | ccid_unregister(&ccid3); |
| 1253 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1254 | if (ccid3_tx_hist != NULL) { |
| 1255 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1256 | ccid3_tx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1257 | } |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1258 | if (ccid3_rx_hist != NULL) { |
| 1259 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1260 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1261 | } |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1262 | if (ccid3_li_hist != NULL) { |
| 1263 | dccp_li_hist_delete(ccid3_li_hist); |
| 1264 | ccid3_li_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1265 | } |
| 1266 | } |
| 1267 | module_exit(ccid3_module_exit); |
| 1268 | |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 1269 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1270 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1271 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
| 1272 | MODULE_LICENSE("GPL"); |
| 1273 | MODULE_ALIAS("net-dccp-ccid-3"); |