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) |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 124 | * X_calc = calcX(s, R, p); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 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; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 130 | * |
| 131 | * If X has changed, we also update the scheduled send time t_now, |
| 132 | * the inter-packet interval t_ipi, and the delta value. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 133 | */ |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 134 | static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) |
| 135 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 136 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 137 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 138 | const __u32 old_x = hctx->ccid3hctx_x; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 139 | |
Gerrit Renker | 4415830 | 2006-12-03 14:53:07 -0200 | [diff] [blame] | 140 | if (hctx->ccid3hctx_p > 0) { |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 141 | hctx->ccid3hctx_x = max_t(u32, min(hctx->ccid3hctx_x_calc, |
| 142 | hctx->ccid3hctx_x_recv * 2), |
| 143 | hctx->ccid3hctx_s / TFRC_T_MBI); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 144 | |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 145 | } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) >= |
| 146 | hctx->ccid3hctx_rtt) { |
| 147 | hctx->ccid3hctx_x = max(min(hctx->ccid3hctx_x_recv, |
| 148 | hctx->ccid3hctx_x ) * 2, |
| 149 | usecs_div(hctx->ccid3hctx_s, |
| 150 | hctx->ccid3hctx_rtt) ); |
| 151 | hctx->ccid3hctx_t_ld = *now; |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame^] | 152 | } |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 153 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 154 | if (hctx->ccid3hctx_x != old_x) |
| 155 | ccid3_update_send_time(hctx); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 156 | } |
| 157 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 158 | /* |
| 159 | * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) |
| 160 | * @len: DCCP packet payload size in bytes |
| 161 | */ |
| 162 | static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) |
| 163 | { |
| 164 | if (unlikely(len == 0)) |
| 165 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); |
| 166 | else |
| 167 | hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len : |
| 168 | (9 * hctx->ccid3hctx_s + len) / 10; |
| 169 | /* |
| 170 | * Note: We could do a potential optimisation here - when `s' changes, |
| 171 | * recalculate sending rate and consequently t_ipi, t_delta, and |
| 172 | * t_now. This is however non-standard, and the benefits are not |
| 173 | * clear, so it is currently left out. |
| 174 | */ |
| 175 | } |
| 176 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 177 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
| 178 | { |
| 179 | struct sock *sk = (struct sock *)data; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 180 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 181 | unsigned long t_nfb = USEC_PER_SEC / 5; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 182 | |
| 183 | bh_lock_sock(sk); |
| 184 | if (sock_owned_by_user(sk)) { |
| 185 | /* Try again later. */ |
| 186 | /* XXX: set some sensible MIB */ |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 187 | goto restart_timer; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, |
| 191 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
| 192 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 193 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 194 | case TFRC_SSTATE_NO_FBACK: |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 195 | /* RFC 3448, 4.4: Halve send rate directly */ |
| 196 | hctx->ccid3hctx_x = min_t(u32, hctx->ccid3hctx_x / 2, |
| 197 | hctx->ccid3hctx_s / TFRC_T_MBI); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 198 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 199 | ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " |
| 200 | "bytes/s\n", |
| 201 | dccp_role(sk), sk, |
| 202 | ccid3_tx_state_name(hctx->ccid3hctx_state), |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 203 | hctx->ccid3hctx_x); |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 204 | /* The value of R is still undefined and so we can not recompute |
| 205 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 206 | t_nfb = TFRC_INITIAL_TIMEOUT; |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 207 | ccid3_update_send_time(hctx); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 208 | break; |
| 209 | case TFRC_SSTATE_FBACK: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 210 | /* |
| 211 | * Check if IDLE since last timeout and recv rate is less than |
| 212 | * 4 packets per RTT |
| 213 | */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 214 | if (!hctx->ccid3hctx_idle || |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 215 | (hctx->ccid3hctx_x_recv >= |
| 216 | 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 217 | struct timeval now; |
| 218 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 219 | ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", |
| 220 | dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 221 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 222 | |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame^] | 223 | /* |
| 224 | * Modify the cached value of X_recv [RFC 3448, 4.4] |
| 225 | * |
| 226 | * If (p == 0 || X_calc > 2 * X_recv) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 227 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); |
| 228 | * Else |
| 229 | * X_recv = X_calc / 4; |
| 230 | */ |
Gerrit Renker | 4415830 | 2006-12-03 14:53:07 -0200 | [diff] [blame] | 231 | BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 232 | |
Gerrit Renker | 4415830 | 2006-12-03 14:53:07 -0200 | [diff] [blame] | 233 | if (hctx->ccid3hctx_p == 0 || |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame^] | 234 | hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 235 | hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 236 | hctx->ccid3hctx_s / (2 * TFRC_T_MBI)); |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame^] | 237 | if (hctx->ccid3hctx_p == 0) |
| 238 | dccp_timestamp(sk, &now); |
| 239 | } else |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 240 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; |
| 241 | |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame^] | 242 | /* Now recalculate X [RFC 3448, 4.3, step (4)] */ |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 243 | ccid3_hc_tx_update_x(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 244 | } |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 245 | /* |
| 246 | * Schedule no feedback timer to expire in |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 247 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
| 248 | * 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] | 249 | */ |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 250 | 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] | 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 | */ |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 275 | 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] | 276 | { |
| 277 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 278 | 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] | 279 | struct dccp_tx_hist_entry *new_packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 280 | struct timeval now; |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 281 | long delay; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 282 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 283 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 284 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 285 | /* |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 286 | * This function is called only for Data and DataAck packets. Sending |
| 287 | * zero-sized Data(Ack)s is theoretically possible, but for congestion |
| 288 | * control this case is pathological - ignore it. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 289 | */ |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 290 | if (unlikely(skb->len == 0)) |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 291 | return -EBADMSG; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 292 | |
| 293 | /* See if last packet allocated was not sent */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 294 | new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
| 295 | if (new_packet == NULL || new_packet->dccphtx_sent) { |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 296 | new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, |
Christoph Lameter | 54e6ecb | 2006-12-06 20:33:16 -0800 | [diff] [blame] | 297 | GFP_ATOMIC); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 298 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 299 | if (unlikely(new_packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 300 | DCCP_WARN("%s, sk=%p, not enough mem to add to history," |
| 301 | "send refused\n", dccp_role(sk), sk); |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 302 | return -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 303 | } |
| 304 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 305 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 306 | } |
| 307 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 308 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 309 | |
| 310 | switch (hctx->ccid3hctx_state) { |
| 311 | case TFRC_SSTATE_NO_SENT: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 312 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
| 313 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 314 | hctx->ccid3hctx_last_win_count = 0; |
| 315 | hctx->ccid3hctx_t_last_win_count = now; |
| 316 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 317 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 318 | /* Set initial sending rate to 1 packet per second */ |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 319 | ccid3_hc_tx_update_s(hctx, skb->len); |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 320 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; |
| 321 | |
Gerrit Renker | 90feeb9 | 2006-11-27 12:13:38 -0200 | [diff] [blame] | 322 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
| 323 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; |
| 324 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ |
| 325 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; |
| 326 | |
| 327 | /* Set t_0 for initial packet */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 328 | hctx->ccid3hctx_t_nom = now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 329 | break; |
| 330 | case TFRC_SSTATE_NO_FBACK: |
| 331 | case TFRC_SSTATE_FBACK: |
Gerrit Renker | 91cf5a1 | 2006-11-27 12:25:10 -0200 | [diff] [blame] | 332 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
| 333 | /* |
| 334 | * Scheduling of packet transmissions [RFC 3448, 4.6] |
| 335 | * |
| 336 | * if (t_now > t_nom - delta) |
| 337 | * // send the packet now |
| 338 | * else |
| 339 | * // send the packet in (t_nom - t_now) milliseconds. |
| 340 | */ |
Gerrit Renker | 76d1277 | 2006-12-03 14:50:42 -0200 | [diff] [blame] | 341 | if (delay - (long)hctx->ccid3hctx_delta >= 0) |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 342 | return delay / 1000L; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 343 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 344 | case TFRC_SSTATE_TERM: |
| 345 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 346 | return -EINVAL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 347 | } |
| 348 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 349 | /* prepare to send now (add options etc.) */ |
| 350 | dp->dccps_hc_tx_insert_options = 1; |
| 351 | new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = |
| 352 | hctx->ccid3hctx_last_win_count; |
| 353 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
| 354 | |
| 355 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 356 | } |
| 357 | |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 358 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 359 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 360 | const struct dccp_sock *dp = dccp_sk(sk); |
| 361 | 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] | 362 | struct timeval now; |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 363 | unsigned long quarter_rtt; |
| 364 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 365 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 366 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 367 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 368 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 369 | |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 370 | ccid3_hc_tx_update_s(hctx, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 371 | |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 372 | packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
| 373 | if (unlikely(packet == NULL)) { |
| 374 | DCCP_WARN("packet doesn't exist in history!\n"); |
| 375 | return; |
| 376 | } |
| 377 | if (unlikely(packet->dccphtx_sent)) { |
| 378 | DCCP_WARN("no unsent packet in history!\n"); |
| 379 | return; |
| 380 | } |
| 381 | packet->dccphtx_tstamp = now; |
| 382 | packet->dccphtx_seqno = dp->dccps_gss; |
| 383 | /* |
| 384 | * Check if win_count have changed |
| 385 | * Algorithm in "8.1. Window Counter Value" in RFC 4342. |
| 386 | */ |
| 387 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); |
| 388 | if (likely(hctx->ccid3hctx_rtt > 8)) |
| 389 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 390 | |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 391 | if (quarter_rtt > 0) { |
| 392 | hctx->ccid3hctx_t_last_win_count = now; |
| 393 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + |
| 394 | min_t(unsigned long, quarter_rtt, 5)) % 16; |
| 395 | ccid3_pr_debug("%s, sk=%p, window changed from " |
| 396 | "%u to %u!\n", |
| 397 | dccp_role(sk), sk, |
| 398 | packet->dccphtx_ccval, |
| 399 | hctx->ccid3hctx_last_win_count); |
| 400 | } |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 401 | |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 402 | hctx->ccid3hctx_idle = 0; |
| 403 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
| 404 | packet->dccphtx_sent = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 405 | } |
| 406 | |
| 407 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 408 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 409 | const struct dccp_sock *dp = dccp_sk(sk); |
| 410 | 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] | 411 | struct ccid3_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 412 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 413 | struct timeval now; |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 414 | unsigned long t_nfb; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 415 | u32 pinv; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 416 | long r_sample, t_elapsed; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 417 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 418 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 419 | |
| 420 | /* we are only interested in ACKs */ |
| 421 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || |
| 422 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) |
| 423 | return; |
| 424 | |
| 425 | opt_recv = &hctx->ccid3hctx_options_received; |
| 426 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 427 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 428 | case TFRC_SSTATE_NO_FBACK: |
| 429 | case TFRC_SSTATE_FBACK: |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 430 | /* get packet from history to look up t_recvdata */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 431 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
| 432 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 433 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 434 | DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 435 | "in history!\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 436 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 437 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 438 | return; |
| 439 | } |
| 440 | |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 441 | /* Update receive rate */ |
| 442 | hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; |
| 443 | |
| 444 | /* Update loss event rate */ |
| 445 | pinv = opt_recv->ccid3or_loss_event_rate; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 446 | if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 447 | hctx->ccid3hctx_p = 0; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 448 | else /* can not exceed 100% */ |
Gerrit Renker | 4415830 | 2006-12-03 14:53:07 -0200 | [diff] [blame] | 449 | hctx->ccid3hctx_p = 1000000 / pinv; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 450 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 451 | dccp_timestamp(sk, &now); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 452 | |
| 453 | /* |
| 454 | * Calculate new round trip sample as per [RFC 3448, 4.3] by |
| 455 | * R_sample = (now - t_recvdata) - t_elapsed |
| 456 | */ |
| 457 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); |
| 458 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
| 459 | |
| 460 | if (unlikely(r_sample <= 0)) { |
| 461 | DCCP_WARN("WARNING: R_sample (%ld) <= 0!\n", r_sample); |
| 462 | r_sample = 0; |
| 463 | } else if (unlikely(r_sample <= t_elapsed)) |
| 464 | DCCP_WARN("WARNING: r_sample=%ldus <= t_elapsed=%ldus\n", |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 465 | r_sample, t_elapsed); |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 466 | else |
| 467 | r_sample -= t_elapsed; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 468 | |
| 469 | /* Update RTT estimate by |
| 470 | * If (No feedback recv) |
| 471 | * R = R_sample; |
| 472 | * Else |
| 473 | * R = q * R + (1 - q) * R_sample; |
| 474 | * |
| 475 | * q is a constant, RFC 3448 recomments 0.9 |
| 476 | */ |
| 477 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 478 | /* Use Larger Initial Windows [RFC 4342, sec. 5] |
| 479 | * We deviate in that we use `s' instead of `MSS'. */ |
| 480 | u16 w_init = max( 4 * hctx->ccid3hctx_s, |
| 481 | max(2 * hctx->ccid3hctx_s, 4380)); |
| 482 | hctx->ccid3hctx_rtt = r_sample; |
| 483 | hctx->ccid3hctx_x = usecs_div(w_init, r_sample); |
| 484 | hctx->ccid3hctx_t_ld = now; |
| 485 | |
| 486 | ccid3_update_send_time(hctx); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 487 | |
| 488 | ccid3_pr_debug("%s(%p), s=%u, w_init=%u, " |
| 489 | "R_sample=%ldus, X=%u\n", dccp_role(sk), |
| 490 | sk, hctx->ccid3hctx_s, w_init, r_sample, |
| 491 | hctx->ccid3hctx_x); |
| 492 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 493 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 494 | } else { |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 495 | hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + |
| 496 | (u32)r_sample ) / 10; |
| 497 | |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame^] | 498 | /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ |
| 499 | if (hctx->ccid3hctx_p > 0) |
| 500 | hctx->ccid3hctx_x_calc = |
| 501 | tfrc_calc_x(hctx->ccid3hctx_s, |
| 502 | hctx->ccid3hctx_rtt, |
| 503 | hctx->ccid3hctx_p); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 504 | ccid3_hc_tx_update_x(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 505 | |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 506 | ccid3_pr_debug("%s(%p), RTT=%uus (sample=%ldus), s=%u, " |
| 507 | "p=%u, X_calc=%u, X=%u\n", dccp_role(sk), |
| 508 | sk, hctx->ccid3hctx_rtt, r_sample, |
| 509 | hctx->ccid3hctx_s, hctx->ccid3hctx_p, |
| 510 | hctx->ccid3hctx_x_calc, |
| 511 | hctx->ccid3hctx_x); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 512 | } |
| 513 | |
| 514 | /* unschedule no feedback timer */ |
| 515 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 516 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 517 | /* remove all packets older than the one acked from history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 518 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
| 519 | &hctx->ccid3hctx_hist, packet); |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 520 | /* |
| 521 | * 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] | 522 | * 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] | 523 | */ |
| 524 | sk->sk_write_space(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 525 | |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 526 | /* |
| 527 | * Update timeout interval for the nofeedback timer. |
| 528 | * We use a configuration option to increase the lower bound. |
| 529 | * This can help avoid triggering the nofeedback timer too often |
| 530 | * ('spinning') on LANs with small RTTs. |
| 531 | */ |
Gerrit Renker | 5d0dbc4 | 2006-11-27 20:32:37 -0200 | [diff] [blame] | 532 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 533 | CONFIG_IP_DCCP_CCID3_RTO * |
| 534 | (USEC_PER_SEC/1000) ); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 535 | /* |
| 536 | * Schedule no feedback timer to expire in |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 537 | * 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] | 538 | */ |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 539 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 540 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 541 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
| 542 | "expire in %lu jiffies (%luus)\n", |
| 543 | dccp_role(sk), sk, |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 544 | usecs_to_jiffies(t_nfb), t_nfb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 545 | |
| 546 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 547 | jiffies + usecs_to_jiffies(t_nfb)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 548 | |
| 549 | /* set idle flag */ |
| 550 | hctx->ccid3hctx_idle = 1; |
| 551 | break; |
Gerrit Renker | 5e19e3f | 2006-11-27 12:28:48 -0200 | [diff] [blame] | 552 | case TFRC_SSTATE_NO_SENT: |
Gerrit Renker | 26af307 | 2006-12-03 14:51:14 -0200 | [diff] [blame] | 553 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_CLIENT) |
| 554 | DCCP_WARN("Illegal ACK received - no packet sent\n"); |
Gerrit Renker | 5e19e3f | 2006-11-27 12:28:48 -0200 | [diff] [blame] | 555 | /* fall through */ |
| 556 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 557 | break; |
| 558 | } |
| 559 | } |
| 560 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 561 | 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] | 562 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 563 | 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] | 564 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 565 | BUG_ON(hctx == NULL); |
| 566 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 567 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
| 568 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; |
| 569 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 570 | } |
| 571 | |
| 572 | 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] | 573 | unsigned char len, u16 idx, |
| 574 | unsigned char *value) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 575 | { |
| 576 | int rc = 0; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 577 | const struct dccp_sock *dp = dccp_sk(sk); |
| 578 | 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] | 579 | struct ccid3_options_received *opt_recv; |
| 580 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 581 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 582 | |
| 583 | opt_recv = &hctx->ccid3hctx_options_received; |
| 584 | |
| 585 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { |
| 586 | opt_recv->ccid3or_seqno = dp->dccps_gsr; |
| 587 | opt_recv->ccid3or_loss_event_rate = ~0; |
| 588 | opt_recv->ccid3or_loss_intervals_idx = 0; |
| 589 | opt_recv->ccid3or_loss_intervals_len = 0; |
| 590 | opt_recv->ccid3or_receive_rate = 0; |
| 591 | } |
| 592 | |
| 593 | switch (option) { |
| 594 | case TFRC_OPT_LOSS_EVENT_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 595 | if (unlikely(len != 4)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 596 | DCCP_WARN("%s, sk=%p, invalid len %d " |
| 597 | "for TFRC_OPT_LOSS_EVENT_RATE\n", |
| 598 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 599 | rc = -EINVAL; |
| 600 | } else { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 601 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 602 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
| 603 | dccp_role(sk), sk, |
| 604 | opt_recv->ccid3or_loss_event_rate); |
| 605 | } |
| 606 | break; |
| 607 | case TFRC_OPT_LOSS_INTERVALS: |
| 608 | opt_recv->ccid3or_loss_intervals_idx = idx; |
| 609 | opt_recv->ccid3or_loss_intervals_len = len; |
| 610 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", |
| 611 | dccp_role(sk), sk, |
| 612 | opt_recv->ccid3or_loss_intervals_idx, |
| 613 | opt_recv->ccid3or_loss_intervals_len); |
| 614 | break; |
| 615 | case TFRC_OPT_RECEIVE_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 616 | if (unlikely(len != 4)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 617 | DCCP_WARN("%s, sk=%p, invalid len %d " |
| 618 | "for TFRC_OPT_RECEIVE_RATE\n", |
| 619 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 620 | rc = -EINVAL; |
| 621 | } else { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 622 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 623 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
| 624 | dccp_role(sk), sk, |
| 625 | opt_recv->ccid3or_receive_rate); |
| 626 | } |
| 627 | break; |
| 628 | } |
| 629 | |
| 630 | return rc; |
| 631 | } |
| 632 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 633 | 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] | 634 | { |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 635 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 636 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 637 | hctx->ccid3hctx_s = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 638 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
| 639 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | aa5d7df | 2006-03-20 17:35:13 -0800 | [diff] [blame] | 640 | |
| 641 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; |
| 642 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 643 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
| 644 | |
| 645 | return 0; |
| 646 | } |
| 647 | |
| 648 | static void ccid3_hc_tx_exit(struct sock *sk) |
| 649 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 650 | 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] | 651 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 652 | BUG_ON(hctx == NULL); |
| 653 | |
| 654 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); |
| 655 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 656 | |
| 657 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 658 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 659 | } |
| 660 | |
| 661 | /* |
| 662 | * RX Half Connection methods |
| 663 | */ |
| 664 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 665 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 666 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
| 667 | { |
| 668 | static char *ccid3_rx_state_names[] = { |
| 669 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", |
| 670 | [TFRC_RSTATE_DATA] = "DATA", |
| 671 | [TFRC_RSTATE_TERM] = "TERM", |
| 672 | }; |
| 673 | |
| 674 | return ccid3_rx_state_names[state]; |
| 675 | } |
| 676 | #endif |
| 677 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 678 | static void ccid3_hc_rx_set_state(struct sock *sk, |
| 679 | enum ccid3_hc_rx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 680 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 681 | 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] | 682 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
| 683 | |
| 684 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 685 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
| 686 | ccid3_rx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 687 | WARN_ON(state == oldstate); |
| 688 | hcrx->ccid3hcrx_state = state; |
| 689 | } |
| 690 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 691 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
| 692 | { |
| 693 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ |
| 694 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); |
| 695 | else |
| 696 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : |
| 697 | (9 * hcrx->ccid3hcrx_s + len) / 10; |
| 698 | } |
| 699 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 700 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
| 701 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 702 | 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] | 703 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 704 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 705 | struct timeval now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 706 | |
| 707 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); |
| 708 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 709 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 710 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 711 | switch (hcrx->ccid3hcrx_state) { |
| 712 | case TFRC_RSTATE_NO_DATA: |
| 713 | hcrx->ccid3hcrx_x_recv = 0; |
| 714 | break; |
| 715 | case TFRC_RSTATE_DATA: { |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 716 | const u32 delta = timeval_delta(&now, |
| 717 | &hcrx->ccid3hcrx_tstamp_last_feedback); |
Arnaldo Carvalho de Melo | 27ae543e | 2005-09-09 02:31:07 -0300 | [diff] [blame] | 718 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
| 719 | delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 720 | } |
| 721 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 722 | case TFRC_RSTATE_TERM: |
| 723 | 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] | 724 | return; |
| 725 | } |
| 726 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 727 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 728 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 729 | DCCP_WARN("%s, sk=%p, no data packet in history!\n", |
| 730 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 731 | return; |
| 732 | } |
| 733 | |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 734 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 735 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 736 | hcrx->ccid3hcrx_bytes_recv = 0; |
| 737 | |
| 738 | /* Convert to multiples of 10us */ |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 739 | hcrx->ccid3hcrx_elapsed_time = |
| 740 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 741 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 742 | if (hcrx->ccid3hcrx_p == 0) |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 743 | hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ |
| 744 | else if (hcrx->ccid3hcrx_p > 1000000) { |
| 745 | DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); |
| 746 | hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ |
| 747 | } else |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 748 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 749 | |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 750 | dp->dccps_hc_rx_insert_options = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 751 | dccp_send_ack(sk); |
| 752 | } |
| 753 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 754 | 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] | 755 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 756 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 757 | __be32 x_recv, pinv; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 758 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 759 | BUG_ON(hcrx == NULL); |
| 760 | |
| 761 | 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] | 762 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 763 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 764 | 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] | 765 | |
| 766 | if (dccp_packet_without_ack(skb)) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 767 | return 0; |
| 768 | |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 769 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
| 770 | pinv = htonl(hcrx->ccid3hcrx_pinv); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 771 | |
| 772 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && |
| 773 | dccp_insert_option_elapsed_time(sk, skb, |
| 774 | hcrx->ccid3hcrx_elapsed_time)) || |
| 775 | dccp_insert_option_timestamp(sk, skb) || |
| 776 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, |
| 777 | &pinv, sizeof(pinv)) || |
| 778 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, |
| 779 | &x_recv, sizeof(x_recv))) |
| 780 | return -1; |
| 781 | |
| 782 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 783 | } |
| 784 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 785 | /* calculate first loss interval |
| 786 | * |
| 787 | * returns estimated loss interval in usecs */ |
| 788 | |
| 789 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) |
| 790 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 791 | 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] | 792 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 793 | u32 rtt, delta, x_recv, fval, p, tmp2; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 794 | struct timeval tstamp = { 0, }; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 795 | int interval = 0; |
| 796 | int win_count = 0; |
| 797 | int step = 0; |
| 798 | u64 tmp1; |
| 799 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 800 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
| 801 | dccphrx_node) { |
| 802 | if (dccp_rx_hist_entry_data_packet(entry)) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 803 | tail = entry; |
| 804 | |
| 805 | switch (step) { |
| 806 | case 0: |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 807 | tstamp = entry->dccphrx_tstamp; |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 808 | win_count = entry->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 809 | step = 1; |
| 810 | break; |
| 811 | case 1: |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 812 | interval = win_count - entry->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 813 | if (interval < 0) |
| 814 | interval += TFRC_WIN_COUNT_LIMIT; |
| 815 | if (interval > 4) |
| 816 | goto found; |
| 817 | break; |
| 818 | } |
| 819 | } |
| 820 | } |
| 821 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 822 | if (unlikely(step == 0)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 823 | DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", |
| 824 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 825 | return ~0; |
| 826 | } |
| 827 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 828 | if (unlikely(interval == 0)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 829 | DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." |
| 830 | "Defaulting to 1\n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 831 | interval = 1; |
| 832 | } |
| 833 | found: |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 834 | if (!tail) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 835 | DCCP_CRIT("tail is null\n"); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 836 | return ~0; |
| 837 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 838 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 839 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
| 840 | dccp_role(sk), sk, rtt); |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 841 | |
| 842 | if (rtt == 0) { |
| 843 | DCCP_WARN("RTT==0, setting to 1\n"); |
| 844 | rtt = 1; |
| 845 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 846 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 847 | dccp_timestamp(sk, &tstamp); |
| 848 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); |
| 849 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 850 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 851 | if (x_recv == 0) |
| 852 | x_recv = hcrx->ccid3hcrx_x_recv; |
| 853 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 854 | tmp1 = (u64)x_recv * (u64)rtt; |
| 855 | do_div(tmp1,10000000); |
| 856 | tmp2 = (u32)tmp1; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 857 | |
| 858 | if (!tmp2) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 859 | 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] | 860 | return ~0; |
| 861 | } |
| 862 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 863 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
| 864 | /* 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] | 865 | p = tfrc_calc_x_reverse_lookup(fval); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 866 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
| 867 | "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] | 868 | |
| 869 | if (p == 0) |
| 870 | return ~0; |
| 871 | else |
| 872 | return 1000000 / p; |
| 873 | } |
| 874 | |
| 875 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) |
| 876 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 877 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 878 | struct dccp_li_hist_entry *head; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 879 | u64 seq_temp; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 880 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 881 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 882 | if (!dccp_li_hist_interval_new(ccid3_li_hist, |
| 883 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 884 | return; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 885 | |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 886 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
| 887 | struct dccp_li_hist_entry, dccplih_node); |
| 888 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 889 | } else { |
| 890 | struct dccp_li_hist_entry *entry; |
| 891 | struct list_head *tail; |
| 892 | |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 893 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
| 894 | struct dccp_li_hist_entry, dccplih_node); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 895 | /* FIXME win count check removed as was wrong */ |
| 896 | /* should make this check with receive history */ |
| 897 | /* and compare there as per section 10.2 of RFC4342 */ |
| 898 | |
| 899 | /* new loss event detected */ |
| 900 | /* calculate last interval length */ |
| 901 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); |
Christoph Lameter | 54e6ecb | 2006-12-06 20:33:16 -0800 | [diff] [blame] | 902 | entry = dccp_li_hist_entry_new(ccid3_li_hist, GFP_ATOMIC); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 903 | |
| 904 | if (entry == NULL) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 905 | DCCP_BUG("out of memory - can not allocate entry"); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 906 | return; |
| 907 | } |
| 908 | |
| 909 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); |
| 910 | |
| 911 | tail = hcrx->ccid3hcrx_li_hist.prev; |
| 912 | list_del(tail); |
| 913 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); |
| 914 | |
| 915 | /* Create the newest interval */ |
| 916 | entry->dccplih_seqno = seq_loss; |
| 917 | entry->dccplih_interval = seq_temp; |
| 918 | entry->dccplih_win_count = win_loss; |
| 919 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 920 | } |
| 921 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 922 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
| 923 | struct dccp_rx_hist_entry *packet) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 924 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 925 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 926 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
| 927 | u64 seqno = packet->dccphrx_seqno; |
| 928 | u64 tmp_seqno; |
| 929 | int loss = 0; |
| 930 | u8 ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 931 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 932 | |
| 933 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 934 | |
| 935 | if (!rx_hist || |
| 936 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 937 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 938 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 939 | goto detect_out; |
| 940 | } |
| 941 | |
| 942 | |
| 943 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
| 944 | > TFRC_RECV_NUM_LATE_LOSS) { |
| 945 | loss = 1; |
| 946 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, |
| 947 | hcrx->ccid3hcrx_ccval_nonloss); |
| 948 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 949 | dccp_inc_seqno(&tmp_seqno); |
| 950 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 951 | dccp_inc_seqno(&tmp_seqno); |
| 952 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, |
| 953 | tmp_seqno, &ccval)) { |
| 954 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 955 | hcrx->ccid3hcrx_ccval_nonloss = ccval; |
| 956 | dccp_inc_seqno(&tmp_seqno); |
| 957 | } |
| 958 | } |
| 959 | |
| 960 | /* FIXME - this code could be simplified with above while */ |
| 961 | /* but works at moment */ |
| 962 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 963 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 964 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 965 | } |
| 966 | |
| 967 | detect_out: |
| 968 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, |
| 969 | &hcrx->ccid3hcrx_li_hist, packet, |
| 970 | hcrx->ccid3hcrx_seqno_nonloss); |
| 971 | return loss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 972 | } |
| 973 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 974 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 975 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 976 | 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] | 977 | const struct dccp_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 978 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 979 | struct timeval now; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 980 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 981 | int loss, payload_size; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 982 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 983 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 984 | |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 985 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 986 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 987 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
| 988 | case DCCP_PKT_ACK: |
| 989 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 990 | return; |
| 991 | case DCCP_PKT_DATAACK: |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 992 | if (opt_recv->dccpor_timestamp_echo == 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 993 | break; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 994 | rtt_prev = hcrx->ccid3hcrx_rtt; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 995 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 996 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
| 997 | r_sample = timeval_usecs(&now); |
| 998 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; |
| 999 | |
| 1000 | if (unlikely(r_sample <= t_elapsed)) |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1001 | DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", |
| 1002 | r_sample, t_elapsed); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 1003 | else |
| 1004 | r_sample -= t_elapsed; |
| 1005 | |
| 1006 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 1007 | hcrx->ccid3hcrx_rtt = r_sample; |
| 1008 | else |
| 1009 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + |
| 1010 | r_sample / 10; |
| 1011 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1012 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
| 1013 | 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] | 1014 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
| 1015 | opt_recv->dccpor_elapsed_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1016 | break; |
| 1017 | case DCCP_PKT_DATA: |
| 1018 | break; |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1019 | 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] | 1020 | return; |
| 1021 | } |
| 1022 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1023 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
Christoph Lameter | 54e6ecb | 2006-12-06 20:33:16 -0800 | [diff] [blame] | 1024 | skb, GFP_ATOMIC); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1025 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1026 | DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " |
| 1027 | "to history, consider it lost!\n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1028 | return; |
| 1029 | } |
| 1030 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1031 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1032 | |
| 1033 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) |
| 1034 | return; |
| 1035 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 1036 | payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; |
| 1037 | ccid3_hc_rx_update_s(hcrx, payload_size); |
| 1038 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1039 | switch (hcrx->ccid3hcrx_state) { |
| 1040 | case TFRC_RSTATE_NO_DATA: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1041 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
| 1042 | "feedback\n", |
| 1043 | dccp_role(sk), sk, |
| 1044 | dccp_state_name(sk->sk_state), skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1045 | ccid3_hc_rx_send_feedback(sk); |
| 1046 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); |
| 1047 | return; |
| 1048 | case TFRC_RSTATE_DATA: |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 1049 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1050 | if (loss) |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1051 | break; |
| 1052 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1053 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1054 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
| 1055 | hcrx->ccid3hcrx_rtt) { |
| 1056 | hcrx->ccid3hcrx_tstamp_last_ack = now; |
| 1057 | ccid3_hc_rx_send_feedback(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1058 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1059 | return; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1060 | case TFRC_RSTATE_TERM: |
| 1061 | 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] | 1062 | return; |
| 1063 | } |
| 1064 | |
| 1065 | /* Dealing with packet loss */ |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1066 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
| 1067 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1068 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1069 | p_prev = hcrx->ccid3hcrx_p; |
| 1070 | |
| 1071 | /* Calculate loss event rate */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1072 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 1073 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); |
| 1074 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1075 | /* Scaling up by 1000000 as fixed decimal */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1076 | if (i_mean != 0) |
| 1077 | hcrx->ccid3hcrx_p = 1000000 / i_mean; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1078 | } else |
| 1079 | DCCP_BUG("empty loss history"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1080 | |
| 1081 | if (hcrx->ccid3hcrx_p > p_prev) { |
| 1082 | ccid3_hc_rx_send_feedback(sk); |
| 1083 | return; |
| 1084 | } |
| 1085 | } |
| 1086 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1087 | 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] | 1088 | { |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1089 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1090 | |
| 1091 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); |
| 1092 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1093 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
| 1094 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1095 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1096 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
Arnaldo Carvalho de Melo | 954ee31 | 2005-09-09 02:37:05 -0300 | [diff] [blame] | 1097 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 1098 | hcrx->ccid3hcrx_s = 0; |
Arnaldo Carvalho de Melo | 954ee31 | 2005-09-09 02:37:05 -0300 | [diff] [blame] | 1099 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1100 | return 0; |
| 1101 | } |
| 1102 | |
| 1103 | static void ccid3_hc_rx_exit(struct sock *sk) |
| 1104 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1105 | 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] | 1106 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1107 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1108 | |
| 1109 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); |
| 1110 | |
| 1111 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1112 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1113 | |
| 1114 | /* Empty loss interval history */ |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1115 | 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] | 1116 | } |
| 1117 | |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1118 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
| 1119 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1120 | 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] | 1121 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1122 | /* Listen socks doesn't have a private CCID block */ |
| 1123 | if (sk->sk_state == DCCP_LISTEN) |
| 1124 | return; |
| 1125 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1126 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1127 | |
| 1128 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; |
| 1129 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; |
| 1130 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; |
| 1131 | } |
| 1132 | |
| 1133 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) |
| 1134 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1135 | 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] | 1136 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1137 | /* Listen socks doesn't have a private CCID block */ |
| 1138 | if (sk->sk_state == DCCP_LISTEN) |
| 1139 | return; |
| 1140 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1141 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1142 | |
| 1143 | info->tcpi_rto = hctx->ccid3hctx_t_rto; |
| 1144 | info->tcpi_rtt = hctx->ccid3hctx_rtt; |
| 1145 | } |
| 1146 | |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1147 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
| 1148 | u32 __user *optval, int __user *optlen) |
| 1149 | { |
| 1150 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
| 1151 | const void *val; |
| 1152 | |
| 1153 | /* Listen socks doesn't have a private CCID block */ |
| 1154 | if (sk->sk_state == DCCP_LISTEN) |
| 1155 | return -EINVAL; |
| 1156 | |
| 1157 | switch (optname) { |
| 1158 | case DCCP_SOCKOPT_CCID_RX_INFO: |
| 1159 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) |
| 1160 | return -EINVAL; |
| 1161 | len = sizeof(hcrx->ccid3hcrx_tfrc); |
| 1162 | val = &hcrx->ccid3hcrx_tfrc; |
| 1163 | break; |
| 1164 | default: |
| 1165 | return -ENOPROTOOPT; |
| 1166 | } |
| 1167 | |
| 1168 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1169 | return -EFAULT; |
| 1170 | |
| 1171 | return 0; |
| 1172 | } |
| 1173 | |
| 1174 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, |
| 1175 | u32 __user *optval, int __user *optlen) |
| 1176 | { |
| 1177 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
| 1178 | const void *val; |
| 1179 | |
| 1180 | /* Listen socks doesn't have a private CCID block */ |
| 1181 | if (sk->sk_state == DCCP_LISTEN) |
| 1182 | return -EINVAL; |
| 1183 | |
| 1184 | switch (optname) { |
| 1185 | case DCCP_SOCKOPT_CCID_TX_INFO: |
| 1186 | if (len < sizeof(hctx->ccid3hctx_tfrc)) |
| 1187 | return -EINVAL; |
| 1188 | len = sizeof(hctx->ccid3hctx_tfrc); |
| 1189 | val = &hctx->ccid3hctx_tfrc; |
| 1190 | break; |
| 1191 | default: |
| 1192 | return -ENOPROTOOPT; |
| 1193 | } |
| 1194 | |
| 1195 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1196 | return -EFAULT; |
| 1197 | |
| 1198 | return 0; |
| 1199 | } |
| 1200 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1201 | static struct ccid_operations ccid3 = { |
Ian McDonald | 3dd9a7c | 2006-09-22 14:26:44 +1200 | [diff] [blame] | 1202 | .ccid_id = DCCPC_CCID3, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1203 | .ccid_name = "ccid3", |
| 1204 | .ccid_owner = THIS_MODULE, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1205 | .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] | 1206 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
| 1207 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, |
| 1208 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, |
| 1209 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, |
| 1210 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, |
| 1211 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, |
| 1212 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1213 | .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] | 1214 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
| 1215 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, |
| 1216 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, |
| 1217 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1218 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
| 1219 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1220 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
| 1221 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1222 | }; |
| 1223 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1224 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1225 | module_param(ccid3_debug, int, 0444); |
| 1226 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1227 | #endif |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1228 | |
| 1229 | static __init int ccid3_module_init(void) |
| 1230 | { |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1231 | int rc = -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1232 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1233 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
| 1234 | if (ccid3_rx_hist == NULL) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1235 | goto out; |
| 1236 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1237 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
| 1238 | if (ccid3_tx_hist == NULL) |
| 1239 | goto out_free_rx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1240 | |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1241 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
| 1242 | if (ccid3_li_hist == NULL) |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1243 | goto out_free_tx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1244 | |
| 1245 | rc = ccid_register(&ccid3); |
| 1246 | if (rc != 0) |
| 1247 | goto out_free_loss_interval_history; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1248 | out: |
| 1249 | return rc; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1250 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1251 | out_free_loss_interval_history: |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1252 | dccp_li_hist_delete(ccid3_li_hist); |
| 1253 | ccid3_li_hist = NULL; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1254 | out_free_tx: |
| 1255 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1256 | ccid3_tx_hist = NULL; |
| 1257 | out_free_rx: |
| 1258 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1259 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1260 | goto out; |
| 1261 | } |
| 1262 | module_init(ccid3_module_init); |
| 1263 | |
| 1264 | static __exit void ccid3_module_exit(void) |
| 1265 | { |
| 1266 | ccid_unregister(&ccid3); |
| 1267 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1268 | if (ccid3_tx_hist != NULL) { |
| 1269 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1270 | ccid3_tx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1271 | } |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1272 | if (ccid3_rx_hist != NULL) { |
| 1273 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1274 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1275 | } |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1276 | if (ccid3_li_hist != NULL) { |
| 1277 | dccp_li_hist_delete(ccid3_li_hist); |
| 1278 | ccid3_li_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1279 | } |
| 1280 | } |
| 1281 | module_exit(ccid3_module_exit); |
| 1282 | |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 1283 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1284 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1285 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
| 1286 | MODULE_LICENSE("GPL"); |
| 1287 | MODULE_ALIAS("net-dccp-ccid-3"); |