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 | cfc3c52 | 2005-08-27 20:20:37 -0300 | [diff] [blame] | 63 | static int ccid3_debug; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 64 | |
Arnaldo Carvalho de Melo | cfc3c52 | 2005-08-27 20:20:37 -0300 | [diff] [blame] | 65 | #ifdef CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 66 | #define ccid3_pr_debug(format, a...) \ |
| 67 | do { if (ccid3_debug) \ |
| 68 | printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \ |
| 69 | } while (0) |
| 70 | #else |
| 71 | #define ccid3_pr_debug(format, a...) |
| 72 | #endif |
| 73 | |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 74 | static struct dccp_tx_hist *ccid3_tx_hist; |
| 75 | static struct dccp_rx_hist *ccid3_rx_hist; |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 76 | static struct dccp_li_hist *ccid3_li_hist; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 77 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 78 | /* TFRC sender states */ |
| 79 | enum ccid3_hc_tx_states { |
| 80 | TFRC_SSTATE_NO_SENT = 1, |
| 81 | TFRC_SSTATE_NO_FBACK, |
| 82 | TFRC_SSTATE_FBACK, |
| 83 | TFRC_SSTATE_TERM, |
| 84 | }; |
| 85 | |
| 86 | #ifdef CCID3_DEBUG |
| 87 | static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) |
| 88 | { |
| 89 | static char *ccid3_state_names[] = { |
| 90 | [TFRC_SSTATE_NO_SENT] = "NO_SENT", |
| 91 | [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", |
| 92 | [TFRC_SSTATE_FBACK] = "FBACK", |
| 93 | [TFRC_SSTATE_TERM] = "TERM", |
| 94 | }; |
| 95 | |
| 96 | return ccid3_state_names[state]; |
| 97 | } |
| 98 | #endif |
| 99 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 100 | static void ccid3_hc_tx_set_state(struct sock *sk, |
| 101 | enum ccid3_hc_tx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 102 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 103 | 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] | 104 | enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; |
| 105 | |
| 106 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 107 | dccp_role(sk), sk, ccid3_tx_state_name(oldstate), |
| 108 | ccid3_tx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 109 | WARN_ON(state == oldstate); |
| 110 | hctx->ccid3hctx_state = state; |
| 111 | } |
| 112 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 113 | /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ |
| 114 | static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx) |
| 115 | { |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 116 | /* |
| 117 | * If no feedback spec says t_ipi is 1 second (set elsewhere and then |
| 118 | * doubles after every no feedback timer (separate function) |
| 119 | */ |
| 120 | if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK) |
| 121 | hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, |
| 122 | hctx->ccid3hctx_x); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 123 | } |
| 124 | |
| 125 | /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ |
| 126 | static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx) |
| 127 | { |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 128 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
| 129 | TFRC_OPSYS_HALF_TIME_GRAN); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | /* |
| 133 | * Update X by |
| 134 | * If (p > 0) |
| 135 | * x_calc = calcX(s, R, p); |
| 136 | * X = max(min(X_calc, 2 * X_recv), s / t_mbi); |
| 137 | * Else |
| 138 | * If (now - tld >= R) |
| 139 | * X = max(min(2 * X, 2 * X_recv), s / R); |
| 140 | * tld = now; |
| 141 | */ |
| 142 | static void ccid3_hc_tx_update_x(struct sock *sk) |
| 143 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 144 | 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] | 145 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 146 | /* To avoid large error in calcX */ |
| 147 | if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 148 | hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, |
| 149 | hctx->ccid3hctx_rtt, |
| 150 | hctx->ccid3hctx_p); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 151 | hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, |
| 152 | 2 * hctx->ccid3hctx_x_recv), |
| 153 | (hctx->ccid3hctx_s / |
| 154 | TFRC_MAX_BACK_OFF_TIME)); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 155 | } else { |
| 156 | struct timeval now; |
| 157 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 158 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 159 | if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= |
| 160 | hctx->ccid3hctx_rtt) { |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 161 | hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, |
| 162 | hctx->ccid3hctx_x) * 2, |
| 163 | usecs_div(hctx->ccid3hctx_s, |
| 164 | hctx->ccid3hctx_rtt)); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 165 | hctx->ccid3hctx_t_ld = now; |
| 166 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 167 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
| 171 | { |
| 172 | struct sock *sk = (struct sock *)data; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 173 | unsigned long next_tmout = 0; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 174 | 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] | 175 | |
| 176 | bh_lock_sock(sk); |
| 177 | if (sock_owned_by_user(sk)) { |
| 178 | /* Try again later. */ |
| 179 | /* XXX: set some sensible MIB */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 180 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
| 181 | jiffies + HZ / 5); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 182 | goto out; |
| 183 | } |
| 184 | |
| 185 | ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, |
| 186 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
| 187 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 188 | switch (hctx->ccid3hctx_state) { |
| 189 | case TFRC_SSTATE_TERM: |
| 190 | goto out; |
| 191 | case TFRC_SSTATE_NO_FBACK: |
| 192 | /* Halve send rate */ |
| 193 | hctx->ccid3hctx_x /= 2; |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 194 | if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / |
| 195 | TFRC_MAX_BACK_OFF_TIME)) |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 196 | hctx->ccid3hctx_x = (hctx->ccid3hctx_s / |
| 197 | TFRC_MAX_BACK_OFF_TIME); |
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); |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 204 | next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s, |
| 205 | hctx->ccid3hctx_x), |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 206 | TFRC_INITIAL_TIMEOUT); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 207 | /* |
| 208 | * FIXME - not sure above calculation is correct. See section |
| 209 | * 5 of CCID3 11 should adjust tx_t_ipi and double that to |
| 210 | * achieve it really |
| 211 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 212 | break; |
| 213 | case TFRC_SSTATE_FBACK: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 214 | /* |
| 215 | * Check if IDLE since last timeout and recv rate is less than |
| 216 | * 4 packets per RTT |
| 217 | */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 218 | if (!hctx->ccid3hctx_idle || |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 219 | (hctx->ccid3hctx_x_recv >= |
| 220 | 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { |
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, |
| 238 | hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); |
| 239 | else |
| 240 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; |
| 241 | |
| 242 | /* Update sending rate */ |
| 243 | ccid3_hc_tx_update_x(sk); |
| 244 | } |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 245 | /* |
| 246 | * Schedule no feedback timer to expire in |
| 247 | * max(4 * R, 2 * s / X) |
| 248 | */ |
Arnaldo Carvalho de Melo | c68e64c | 2005-08-21 05:07:37 -0300 | [diff] [blame] | 249 | next_tmout = max_t(u32, hctx->ccid3hctx_t_rto, |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 250 | 2 * usecs_div(hctx->ccid3hctx_s, |
| 251 | hctx->ccid3hctx_x)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 252 | break; |
| 253 | default: |
| 254 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", |
| 255 | __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); |
| 256 | dump_stack(); |
| 257 | goto out; |
| 258 | } |
| 259 | |
| 260 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 261 | jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 262 | hctx->ccid3hctx_idle = 1; |
| 263 | out: |
| 264 | bh_unlock_sock(sk); |
| 265 | sock_put(sk); |
| 266 | } |
| 267 | |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 268 | static int ccid3_hc_tx_send_packet(struct sock *sk, |
| 269 | struct sk_buff *skb, int len) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 270 | { |
| 271 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 272 | 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] | 273 | struct dccp_tx_hist_entry *new_packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 274 | struct timeval now; |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 275 | long delay; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 276 | int rc = -ENOTCONN; |
| 277 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 278 | BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 279 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 280 | /* Check if pure ACK or Terminating*/ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 281 | /* |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 282 | * XXX: We only call this function for DATA and DATAACK, on, these |
| 283 | * packets can have zero length, but why the comment about "pure ACK"? |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 284 | */ |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 285 | if (unlikely(len == 0)) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 286 | goto out; |
| 287 | |
| 288 | /* See if last packet allocated was not sent */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 289 | new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
| 290 | if (new_packet == NULL || new_packet->dccphtx_sent) { |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 291 | new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, |
| 292 | SLAB_ATOMIC); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 293 | |
| 294 | rc = -ENOBUFS; |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 295 | if (unlikely(new_packet == NULL)) { |
| 296 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, not enough " |
| 297 | "mem to add to history, send refused\n", |
| 298 | __FUNCTION__, dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 299 | goto out; |
| 300 | } |
| 301 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 302 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 303 | } |
| 304 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 305 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 306 | |
| 307 | switch (hctx->ccid3hctx_state) { |
| 308 | case TFRC_SSTATE_NO_SENT: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 309 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
| 310 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 311 | hctx->ccid3hctx_last_win_count = 0; |
| 312 | hctx->ccid3hctx_t_last_win_count = now; |
| 313 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); |
Arnaldo Carvalho de Melo | d7e0fb9 | 2005-09-09 19:58:18 -0300 | [diff] [blame] | 314 | hctx->ccid3hctx_t_ipi = TFRC_INITIAL_IPI; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 315 | |
| 316 | /* Set nominal send time for initial packet */ |
| 317 | hctx->ccid3hctx_t_nom = now; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 318 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
| 319 | hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 320 | ccid3_calc_new_delta(hctx); |
| 321 | rc = 0; |
| 322 | break; |
| 323 | case TFRC_SSTATE_NO_FBACK: |
| 324 | case TFRC_SSTATE_FBACK: |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 325 | delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) - |
| 326 | hctx->ccid3hctx_delta); |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 327 | delay /= -1000; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 328 | /* divide by -1000 is to convert to ms and get sign right */ |
Arnaldo Carvalho de Melo | d6809c1 | 2005-08-27 03:06:35 -0300 | [diff] [blame] | 329 | rc = delay > 0 ? delay : 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 330 | break; |
| 331 | default: |
| 332 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", |
| 333 | __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); |
| 334 | dump_stack(); |
| 335 | rc = -EINVAL; |
| 336 | break; |
| 337 | } |
| 338 | |
| 339 | /* Can we send? if so add options and add to packet history */ |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 340 | if (rc == 0) { |
| 341 | dp->dccps_hc_tx_insert_options = 1; |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 342 | new_packet->dccphtx_ccval = |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 343 | DCCP_SKB_CB(skb)->dccpd_ccval = |
| 344 | hctx->ccid3hctx_last_win_count; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 345 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
| 346 | hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 347 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 348 | out: |
| 349 | return rc; |
| 350 | } |
| 351 | |
| 352 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) |
| 353 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 354 | const struct dccp_sock *dp = dccp_sk(sk); |
| 355 | 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] | 356 | struct timeval now; |
| 357 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 358 | BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 359 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 360 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 361 | |
| 362 | /* check if we have sent a data packet */ |
| 363 | if (len > 0) { |
| 364 | unsigned long quarter_rtt; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 365 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 366 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 367 | packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 368 | if (unlikely(packet == NULL)) { |
| 369 | LIMIT_NETDEBUG(KERN_WARNING "%s: packet doesn't " |
| 370 | "exists in history!\n", __FUNCTION__); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 371 | return; |
| 372 | } |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 373 | if (unlikely(packet->dccphtx_sent)) { |
| 374 | LIMIT_NETDEBUG(KERN_WARNING "%s: no unsent packet in " |
| 375 | "history!\n", __FUNCTION__); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 376 | return; |
| 377 | } |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 378 | packet->dccphtx_tstamp = now; |
| 379 | packet->dccphtx_seqno = dp->dccps_gss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 380 | /* |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 381 | * Check if win_count have changed |
| 382 | * Algorithm in "8.1. Window Counter Valuer" in |
| 383 | * draft-ietf-dccp-ccid3-11.txt |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 384 | */ |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 385 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); |
| 386 | if (likely(hctx->ccid3hctx_rtt > 8)) |
| 387 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; |
| 388 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 389 | if (quarter_rtt > 0) { |
| 390 | hctx->ccid3hctx_t_last_win_count = now; |
| 391 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + |
| 392 | min_t(unsigned long, quarter_rtt, 5)) % 16; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 393 | ccid3_pr_debug("%s, sk=%p, window changed from " |
| 394 | "%u to %u!\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 395 | dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 396 | packet->dccphtx_ccval, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 397 | hctx->ccid3hctx_last_win_count); |
| 398 | } |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 399 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 400 | hctx->ccid3hctx_idle = 0; |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 401 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 402 | packet->dccphtx_sent = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 403 | } else |
| 404 | ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", |
| 405 | dccp_role(sk), sk, dp->dccps_gss); |
| 406 | |
| 407 | switch (hctx->ccid3hctx_state) { |
| 408 | case TFRC_SSTATE_NO_SENT: |
| 409 | /* if first wasn't pure ack */ |
| 410 | if (len != 0) |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 411 | printk(KERN_CRIT "%s: %s, First packet sent is noted " |
| 412 | "as a data packet\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 413 | __FUNCTION__, dccp_role(sk)); |
| 414 | return; |
| 415 | case TFRC_SSTATE_NO_FBACK: |
| 416 | case TFRC_SSTATE_FBACK: |
| 417 | if (len > 0) { |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 418 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, |
| 419 | hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 420 | ccid3_calc_new_t_ipi(hctx); |
| 421 | ccid3_calc_new_delta(hctx); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 422 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
| 423 | hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 424 | } |
| 425 | break; |
| 426 | default: |
| 427 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", |
| 428 | __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); |
| 429 | dump_stack(); |
| 430 | break; |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 435 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 436 | const struct dccp_sock *dp = dccp_sk(sk); |
| 437 | 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] | 438 | struct ccid3_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 439 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 440 | struct timeval now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 441 | unsigned long next_tmout; |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 442 | u32 t_elapsed; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 443 | u32 pinv; |
| 444 | u32 x_recv; |
| 445 | u32 r_sample; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 446 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 447 | BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 448 | |
| 449 | /* we are only interested in ACKs */ |
| 450 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || |
| 451 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) |
| 452 | return; |
| 453 | |
| 454 | opt_recv = &hctx->ccid3hctx_options_received; |
| 455 | |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 456 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 457 | x_recv = opt_recv->ccid3or_receive_rate; |
| 458 | pinv = opt_recv->ccid3or_loss_event_rate; |
| 459 | |
| 460 | switch (hctx->ccid3hctx_state) { |
| 461 | case TFRC_SSTATE_NO_SENT: |
| 462 | /* FIXME: what to do here? */ |
| 463 | return; |
| 464 | case TFRC_SSTATE_NO_FBACK: |
| 465 | case TFRC_SSTATE_FBACK: |
| 466 | /* Calculate new round trip sample by |
| 467 | * R_sample = (now - t_recvdata) - t_delay */ |
| 468 | /* get t_recvdata from history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 469 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
| 470 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 471 | if (unlikely(packet == NULL)) { |
| 472 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, seqno " |
| 473 | "%llu(%s) does't exist in history!\n", |
| 474 | __FUNCTION__, dccp_role(sk), sk, |
| 475 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
| 476 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 477 | return; |
| 478 | } |
| 479 | |
| 480 | /* Update RTT */ |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 481 | dccp_timestamp(sk, &now); |
| 482 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 483 | if (unlikely(r_sample <= t_elapsed)) |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 484 | LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, " |
| 485 | "t_elapsed=%uus\n", |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 486 | __FUNCTION__, r_sample, t_elapsed); |
| 487 | else |
| 488 | r_sample -= t_elapsed; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 489 | |
| 490 | /* Update RTT estimate by |
| 491 | * If (No feedback recv) |
| 492 | * R = R_sample; |
| 493 | * Else |
| 494 | * R = q * R + (1 - q) * R_sample; |
| 495 | * |
| 496 | * q is a constant, RFC 3448 recomments 0.9 |
| 497 | */ |
| 498 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { |
| 499 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
| 500 | hctx->ccid3hctx_rtt = r_sample; |
| 501 | } else |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 502 | hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + |
| 503 | r_sample / 10; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 504 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 505 | ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " |
| 506 | "r_sample=%us\n", dccp_role(sk), sk, |
| 507 | hctx->ccid3hctx_rtt, r_sample); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 508 | |
| 509 | /* Update timeout interval */ |
Arnaldo Carvalho de Melo | c68e64c | 2005-08-21 05:07:37 -0300 | [diff] [blame] | 510 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
| 511 | USEC_PER_SEC); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 512 | |
| 513 | /* Update receive rate */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 514 | 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] | 515 | |
| 516 | /* Update loss event rate */ |
| 517 | if (pinv == ~0 || pinv == 0) |
| 518 | hctx->ccid3hctx_p = 0; |
| 519 | else { |
| 520 | hctx->ccid3hctx_p = 1000000 / pinv; |
| 521 | |
| 522 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { |
| 523 | hctx->ccid3hctx_p = TFRC_SMALLEST_P; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 524 | ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", |
| 525 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 526 | } |
| 527 | } |
| 528 | |
| 529 | /* unschedule no feedback timer */ |
| 530 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 531 | |
| 532 | /* Update sending rate */ |
| 533 | ccid3_hc_tx_update_x(sk); |
| 534 | |
| 535 | /* Update next send time */ |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 536 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, |
| 537 | hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 538 | ccid3_calc_new_t_ipi(hctx); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 539 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
| 540 | hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 541 | ccid3_calc_new_delta(hctx); |
| 542 | |
| 543 | /* remove all packets older than the one acked from history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 544 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
| 545 | &hctx->ccid3hctx_hist, packet); |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 546 | /* |
| 547 | * As we have calculated new ipi, delta, t_nom it is possible that |
| 548 | * we now can send a packet, so wake up dccp_wait_for_ccids. |
| 549 | */ |
| 550 | sk->sk_write_space(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 551 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 552 | /* |
| 553 | * Schedule no feedback timer to expire in |
| 554 | * max(4 * R, 2 * s / X) |
| 555 | */ |
Arnaldo Carvalho de Melo | c68e64c | 2005-08-21 05:07:37 -0300 | [diff] [blame] | 556 | next_tmout = max(hctx->ccid3hctx_t_rto, |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 557 | 2 * usecs_div(hctx->ccid3hctx_s, |
| 558 | hctx->ccid3hctx_x)); |
| 559 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 560 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
| 561 | "expire in %lu jiffies (%luus)\n", |
| 562 | dccp_role(sk), sk, |
| 563 | usecs_to_jiffies(next_tmout), next_tmout); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 564 | |
| 565 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 566 | jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 567 | |
| 568 | /* set idle flag */ |
| 569 | hctx->ccid3hctx_idle = 1; |
| 570 | break; |
| 571 | default: |
| 572 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", |
| 573 | __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); |
| 574 | dump_stack(); |
| 575 | break; |
| 576 | } |
| 577 | } |
| 578 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 579 | 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] | 580 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 581 | 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] | 582 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 583 | BUG_ON(hctx == NULL); |
| 584 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 585 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
| 586 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; |
| 587 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | 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] | 591 | unsigned char len, u16 idx, |
| 592 | unsigned char *value) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 593 | { |
| 594 | int rc = 0; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 595 | const struct dccp_sock *dp = dccp_sk(sk); |
| 596 | 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] | 597 | struct ccid3_options_received *opt_recv; |
| 598 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 599 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 600 | |
| 601 | opt_recv = &hctx->ccid3hctx_options_received; |
| 602 | |
| 603 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { |
| 604 | opt_recv->ccid3or_seqno = dp->dccps_gsr; |
| 605 | opt_recv->ccid3or_loss_event_rate = ~0; |
| 606 | opt_recv->ccid3or_loss_intervals_idx = 0; |
| 607 | opt_recv->ccid3or_loss_intervals_len = 0; |
| 608 | opt_recv->ccid3or_receive_rate = 0; |
| 609 | } |
| 610 | |
| 611 | switch (option) { |
| 612 | case TFRC_OPT_LOSS_EVENT_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 613 | if (unlikely(len != 4)) { |
| 614 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid " |
| 615 | "len for TFRC_OPT_LOSS_EVENT_RATE\n", |
| 616 | __FUNCTION__, dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 617 | rc = -EINVAL; |
| 618 | } else { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 619 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 620 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
| 621 | dccp_role(sk), sk, |
| 622 | opt_recv->ccid3or_loss_event_rate); |
| 623 | } |
| 624 | break; |
| 625 | case TFRC_OPT_LOSS_INTERVALS: |
| 626 | opt_recv->ccid3or_loss_intervals_idx = idx; |
| 627 | opt_recv->ccid3or_loss_intervals_len = len; |
| 628 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", |
| 629 | dccp_role(sk), sk, |
| 630 | opt_recv->ccid3or_loss_intervals_idx, |
| 631 | opt_recv->ccid3or_loss_intervals_len); |
| 632 | break; |
| 633 | case TFRC_OPT_RECEIVE_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 634 | if (unlikely(len != 4)) { |
| 635 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid " |
| 636 | "len for TFRC_OPT_RECEIVE_RATE\n", |
| 637 | __FUNCTION__, dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 638 | rc = -EINVAL; |
| 639 | } else { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 640 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 641 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
| 642 | dccp_role(sk), sk, |
| 643 | opt_recv->ccid3or_receive_rate); |
| 644 | } |
| 645 | break; |
| 646 | } |
| 647 | |
| 648 | return rc; |
| 649 | } |
| 650 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 651 | 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] | 652 | { |
| 653 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 654 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 655 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 656 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
| 657 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) |
| 658 | hctx->ccid3hctx_s = dp->dccps_packet_size; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 659 | else |
| 660 | hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; |
| 661 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 662 | /* Set transmission rate to 1 packet per second */ |
| 663 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; |
Arnaldo Carvalho de Melo | c68e64c | 2005-08-21 05:07:37 -0300 | [diff] [blame] | 664 | hctx->ccid3hctx_t_rto = USEC_PER_SEC; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 665 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
| 666 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | aa5d7df | 2006-03-20 17:35:13 -0800 | [diff] [blame] | 667 | |
| 668 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; |
| 669 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 670 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
| 671 | |
| 672 | return 0; |
| 673 | } |
| 674 | |
| 675 | static void ccid3_hc_tx_exit(struct sock *sk) |
| 676 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 677 | 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] | 678 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 679 | BUG_ON(hctx == NULL); |
| 680 | |
| 681 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); |
| 682 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 683 | |
| 684 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 685 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 686 | } |
| 687 | |
| 688 | /* |
| 689 | * RX Half Connection methods |
| 690 | */ |
| 691 | |
| 692 | /* TFRC receiver states */ |
| 693 | enum ccid3_hc_rx_states { |
| 694 | TFRC_RSTATE_NO_DATA = 1, |
| 695 | TFRC_RSTATE_DATA, |
| 696 | TFRC_RSTATE_TERM = 127, |
| 697 | }; |
| 698 | |
| 699 | #ifdef CCID3_DEBUG |
| 700 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
| 701 | { |
| 702 | static char *ccid3_rx_state_names[] = { |
| 703 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", |
| 704 | [TFRC_RSTATE_DATA] = "DATA", |
| 705 | [TFRC_RSTATE_TERM] = "TERM", |
| 706 | }; |
| 707 | |
| 708 | return ccid3_rx_state_names[state]; |
| 709 | } |
| 710 | #endif |
| 711 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 712 | static void ccid3_hc_rx_set_state(struct sock *sk, |
| 713 | enum ccid3_hc_rx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 714 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 715 | 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] | 716 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
| 717 | |
| 718 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 719 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
| 720 | ccid3_rx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 721 | WARN_ON(state == oldstate); |
| 722 | hcrx->ccid3hcrx_state = state; |
| 723 | } |
| 724 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 725 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
| 726 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 727 | 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] | 728 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 729 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 730 | struct timeval now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 731 | |
| 732 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); |
| 733 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 734 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 735 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 736 | switch (hcrx->ccid3hcrx_state) { |
| 737 | case TFRC_RSTATE_NO_DATA: |
| 738 | hcrx->ccid3hcrx_x_recv = 0; |
| 739 | break; |
| 740 | case TFRC_RSTATE_DATA: { |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 741 | const u32 delta = timeval_delta(&now, |
| 742 | &hcrx->ccid3hcrx_tstamp_last_feedback); |
Arnaldo Carvalho de Melo | 27ae543e | 2005-09-09 02:31:07 -0300 | [diff] [blame] | 743 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
| 744 | delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 745 | } |
| 746 | break; |
| 747 | default: |
| 748 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", |
| 749 | __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); |
| 750 | dump_stack(); |
| 751 | return; |
| 752 | } |
| 753 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 754 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 755 | if (unlikely(packet == NULL)) { |
| 756 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, no data packet " |
| 757 | "in history!\n", |
| 758 | __FUNCTION__, dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 759 | return; |
| 760 | } |
| 761 | |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 762 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 763 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 764 | hcrx->ccid3hcrx_bytes_recv = 0; |
| 765 | |
| 766 | /* Convert to multiples of 10us */ |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 767 | hcrx->ccid3hcrx_elapsed_time = |
| 768 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 769 | if (hcrx->ccid3hcrx_p == 0) |
| 770 | hcrx->ccid3hcrx_pinv = ~0; |
| 771 | else |
| 772 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 773 | dp->dccps_hc_rx_insert_options = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 774 | dccp_send_ack(sk); |
| 775 | } |
| 776 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 777 | 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] | 778 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 779 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 780 | __be32 x_recv, pinv; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 781 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 782 | BUG_ON(hcrx == NULL); |
| 783 | |
| 784 | 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] | 785 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 786 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 787 | 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] | 788 | |
| 789 | if (dccp_packet_without_ack(skb)) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 790 | return 0; |
| 791 | |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 792 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
| 793 | pinv = htonl(hcrx->ccid3hcrx_pinv); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 794 | |
| 795 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && |
| 796 | dccp_insert_option_elapsed_time(sk, skb, |
| 797 | hcrx->ccid3hcrx_elapsed_time)) || |
| 798 | dccp_insert_option_timestamp(sk, skb) || |
| 799 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, |
| 800 | &pinv, sizeof(pinv)) || |
| 801 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, |
| 802 | &x_recv, sizeof(x_recv))) |
| 803 | return -1; |
| 804 | |
| 805 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 806 | } |
| 807 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 808 | /* calculate first loss interval |
| 809 | * |
| 810 | * returns estimated loss interval in usecs */ |
| 811 | |
| 812 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) |
| 813 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 814 | 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] | 815 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 816 | u32 rtt, delta, x_recv, fval, p, tmp2; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 817 | struct timeval tstamp = { 0, }; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 818 | int interval = 0; |
| 819 | int win_count = 0; |
| 820 | int step = 0; |
| 821 | u64 tmp1; |
| 822 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 823 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
| 824 | dccphrx_node) { |
| 825 | if (dccp_rx_hist_entry_data_packet(entry)) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 826 | tail = entry; |
| 827 | |
| 828 | switch (step) { |
| 829 | case 0: |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 830 | tstamp = entry->dccphrx_tstamp; |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 831 | win_count = entry->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 832 | step = 1; |
| 833 | break; |
| 834 | case 1: |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 835 | interval = win_count - entry->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 836 | if (interval < 0) |
| 837 | interval += TFRC_WIN_COUNT_LIMIT; |
| 838 | if (interval > 4) |
| 839 | goto found; |
| 840 | break; |
| 841 | } |
| 842 | } |
| 843 | } |
| 844 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 845 | if (unlikely(step == 0)) { |
| 846 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, packet history " |
| 847 | "contains no data packets!\n", |
| 848 | __FUNCTION__, dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 849 | return ~0; |
| 850 | } |
| 851 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 852 | if (unlikely(interval == 0)) { |
| 853 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Could not find a " |
| 854 | "win_count interval > 0. Defaulting to 1\n", |
| 855 | __FUNCTION__, dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 856 | interval = 1; |
| 857 | } |
| 858 | found: |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 859 | if (!tail) { |
| 860 | LIMIT_NETDEBUG(KERN_WARNING "%s: tail is null\n", |
| 861 | __FUNCTION__); |
| 862 | return ~0; |
| 863 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 864 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 865 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
| 866 | dccp_role(sk), sk, rtt); |
| 867 | if (rtt == 0) |
| 868 | rtt = 1; |
| 869 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 870 | dccp_timestamp(sk, &tstamp); |
| 871 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); |
| 872 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 873 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 874 | if (x_recv == 0) |
| 875 | x_recv = hcrx->ccid3hcrx_x_recv; |
| 876 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 877 | tmp1 = (u64)x_recv * (u64)rtt; |
| 878 | do_div(tmp1,10000000); |
| 879 | tmp2 = (u32)tmp1; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 880 | |
| 881 | if (!tmp2) { |
| 882 | LIMIT_NETDEBUG(KERN_WARNING "tmp2 = 0 " |
| 883 | "%s: x_recv = %u, rtt =%u\n", |
| 884 | __FUNCTION__, x_recv, rtt); |
| 885 | return ~0; |
| 886 | } |
| 887 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 888 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
| 889 | /* 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] | 890 | p = tfrc_calc_x_reverse_lookup(fval); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 891 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
| 892 | "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] | 893 | |
| 894 | if (p == 0) |
| 895 | return ~0; |
| 896 | else |
| 897 | return 1000000 / p; |
| 898 | } |
| 899 | |
| 900 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) |
| 901 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 902 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 903 | struct dccp_li_hist_entry *head; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 904 | u64 seq_temp; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 905 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 906 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 907 | if (!dccp_li_hist_interval_new(ccid3_li_hist, |
| 908 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 909 | return; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 910 | |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 911 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
| 912 | struct dccp_li_hist_entry, dccplih_node); |
| 913 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 914 | } else { |
| 915 | struct dccp_li_hist_entry *entry; |
| 916 | struct list_head *tail; |
| 917 | |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 918 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
| 919 | struct dccp_li_hist_entry, dccplih_node); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 920 | /* FIXME win count check removed as was wrong */ |
| 921 | /* should make this check with receive history */ |
| 922 | /* and compare there as per section 10.2 of RFC4342 */ |
| 923 | |
| 924 | /* new loss event detected */ |
| 925 | /* calculate last interval length */ |
| 926 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); |
| 927 | entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); |
| 928 | |
| 929 | if (entry == NULL) { |
| 930 | printk(KERN_CRIT "%s: out of memory\n",__FUNCTION__); |
| 931 | dump_stack(); |
| 932 | return; |
| 933 | } |
| 934 | |
| 935 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); |
| 936 | |
| 937 | tail = hcrx->ccid3hcrx_li_hist.prev; |
| 938 | list_del(tail); |
| 939 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); |
| 940 | |
| 941 | /* Create the newest interval */ |
| 942 | entry->dccplih_seqno = seq_loss; |
| 943 | entry->dccplih_interval = seq_temp; |
| 944 | entry->dccplih_win_count = win_loss; |
| 945 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 946 | } |
| 947 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 948 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
| 949 | struct dccp_rx_hist_entry *packet) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 950 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 951 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 952 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
| 953 | u64 seqno = packet->dccphrx_seqno; |
| 954 | u64 tmp_seqno; |
| 955 | int loss = 0; |
| 956 | u8 ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 957 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 958 | |
| 959 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 960 | |
| 961 | if (!rx_hist || |
| 962 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 963 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 964 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 965 | goto detect_out; |
| 966 | } |
| 967 | |
| 968 | |
| 969 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
| 970 | > TFRC_RECV_NUM_LATE_LOSS) { |
| 971 | loss = 1; |
| 972 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, |
| 973 | hcrx->ccid3hcrx_ccval_nonloss); |
| 974 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 975 | dccp_inc_seqno(&tmp_seqno); |
| 976 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 977 | dccp_inc_seqno(&tmp_seqno); |
| 978 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, |
| 979 | tmp_seqno, &ccval)) { |
| 980 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 981 | hcrx->ccid3hcrx_ccval_nonloss = ccval; |
| 982 | dccp_inc_seqno(&tmp_seqno); |
| 983 | } |
| 984 | } |
| 985 | |
| 986 | /* FIXME - this code could be simplified with above while */ |
| 987 | /* but works at moment */ |
| 988 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 989 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 990 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 991 | } |
| 992 | |
| 993 | detect_out: |
| 994 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, |
| 995 | &hcrx->ccid3hcrx_li_hist, packet, |
| 996 | hcrx->ccid3hcrx_seqno_nonloss); |
| 997 | return loss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 998 | } |
| 999 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1000 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 1001 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1002 | 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] | 1003 | const struct dccp_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1004 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1005 | struct timeval now; |
| 1006 | u8 win_count; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1007 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
| 1008 | int loss; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1009 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1010 | BUG_ON(hcrx == NULL || |
| 1011 | !(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA || |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1012 | hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA)); |
| 1013 | |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1014 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1015 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1016 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
| 1017 | case DCCP_PKT_ACK: |
| 1018 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 1019 | return; |
| 1020 | case DCCP_PKT_DATAACK: |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1021 | if (opt_recv->dccpor_timestamp_echo == 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1022 | break; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1023 | rtt_prev = hcrx->ccid3hcrx_rtt; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1024 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 1025 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
| 1026 | r_sample = timeval_usecs(&now); |
| 1027 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; |
| 1028 | |
| 1029 | if (unlikely(r_sample <= t_elapsed)) |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1030 | LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, " |
| 1031 | "t_elapsed=%uus\n", |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 1032 | __FUNCTION__, r_sample, t_elapsed); |
| 1033 | else |
| 1034 | r_sample -= t_elapsed; |
| 1035 | |
| 1036 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 1037 | hcrx->ccid3hcrx_rtt = r_sample; |
| 1038 | else |
| 1039 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + |
| 1040 | r_sample / 10; |
| 1041 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1042 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
| 1043 | 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] | 1044 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
| 1045 | opt_recv->dccpor_elapsed_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1046 | break; |
| 1047 | case DCCP_PKT_DATA: |
| 1048 | break; |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1049 | 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] | 1050 | return; |
| 1051 | } |
| 1052 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1053 | 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] | 1054 | skb, SLAB_ATOMIC); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1055 | if (unlikely(packet == NULL)) { |
| 1056 | LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Not enough mem to " |
| 1057 | "add rx packet to history, consider it lost!\n", |
| 1058 | __FUNCTION__, dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1059 | return; |
| 1060 | } |
| 1061 | |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 1062 | win_count = packet->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1063 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1064 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1065 | |
| 1066 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) |
| 1067 | return; |
| 1068 | |
| 1069 | switch (hcrx->ccid3hcrx_state) { |
| 1070 | case TFRC_RSTATE_NO_DATA: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1071 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
| 1072 | "feedback\n", |
| 1073 | dccp_role(sk), sk, |
| 1074 | dccp_state_name(sk->sk_state), skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1075 | ccid3_hc_rx_send_feedback(sk); |
| 1076 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); |
| 1077 | return; |
| 1078 | case TFRC_RSTATE_DATA: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1079 | hcrx->ccid3hcrx_bytes_recv += skb->len - |
| 1080 | dccp_hdr(skb)->dccph_doff * 4; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1081 | if (loss) |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1082 | break; |
| 1083 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1084 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1085 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
| 1086 | hcrx->ccid3hcrx_rtt) { |
| 1087 | hcrx->ccid3hcrx_tstamp_last_ack = now; |
| 1088 | ccid3_hc_rx_send_feedback(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1089 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1090 | return; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1091 | default: |
| 1092 | printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", |
| 1093 | __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); |
| 1094 | dump_stack(); |
| 1095 | return; |
| 1096 | } |
| 1097 | |
| 1098 | /* Dealing with packet loss */ |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1099 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
| 1100 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1101 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1102 | p_prev = hcrx->ccid3hcrx_p; |
| 1103 | |
| 1104 | /* Calculate loss event rate */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1105 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 1106 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); |
| 1107 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1108 | /* Scaling up by 1000000 as fixed decimal */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1109 | if (i_mean != 0) |
| 1110 | hcrx->ccid3hcrx_p = 1000000 / i_mean; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1111 | } else { |
| 1112 | printk(KERN_CRIT "%s: empty loss hist\n",__FUNCTION__); |
| 1113 | dump_stack(); |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1114 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1115 | |
| 1116 | if (hcrx->ccid3hcrx_p > p_prev) { |
| 1117 | ccid3_hc_rx_send_feedback(sk); |
| 1118 | return; |
| 1119 | } |
| 1120 | } |
| 1121 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1122 | 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] | 1123 | { |
| 1124 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1125 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1126 | |
| 1127 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); |
| 1128 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 1129 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
| 1130 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) |
| 1131 | hcrx->ccid3hcrx_s = dp->dccps_packet_size; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1132 | else |
| 1133 | hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; |
| 1134 | |
| 1135 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
| 1136 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1137 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1138 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
Arnaldo Carvalho de Melo | 954ee31 | 2005-09-09 02:37:05 -0300 | [diff] [blame] | 1139 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
| 1140 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1141 | return 0; |
| 1142 | } |
| 1143 | |
| 1144 | static void ccid3_hc_rx_exit(struct sock *sk) |
| 1145 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1146 | 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] | 1147 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1148 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1149 | |
| 1150 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); |
| 1151 | |
| 1152 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1153 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1154 | |
| 1155 | /* Empty loss interval history */ |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1156 | 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] | 1157 | } |
| 1158 | |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1159 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
| 1160 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1161 | 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] | 1162 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1163 | /* Listen socks doesn't have a private CCID block */ |
| 1164 | if (sk->sk_state == DCCP_LISTEN) |
| 1165 | return; |
| 1166 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1167 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1168 | |
| 1169 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; |
| 1170 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; |
| 1171 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; |
| 1172 | } |
| 1173 | |
| 1174 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) |
| 1175 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1176 | 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] | 1177 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1178 | /* Listen socks doesn't have a private CCID block */ |
| 1179 | if (sk->sk_state == DCCP_LISTEN) |
| 1180 | return; |
| 1181 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1182 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1183 | |
| 1184 | info->tcpi_rto = hctx->ccid3hctx_t_rto; |
| 1185 | info->tcpi_rtt = hctx->ccid3hctx_rtt; |
| 1186 | } |
| 1187 | |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1188 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
| 1189 | u32 __user *optval, int __user *optlen) |
| 1190 | { |
| 1191 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
| 1192 | const void *val; |
| 1193 | |
| 1194 | /* Listen socks doesn't have a private CCID block */ |
| 1195 | if (sk->sk_state == DCCP_LISTEN) |
| 1196 | return -EINVAL; |
| 1197 | |
| 1198 | switch (optname) { |
| 1199 | case DCCP_SOCKOPT_CCID_RX_INFO: |
| 1200 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) |
| 1201 | return -EINVAL; |
| 1202 | len = sizeof(hcrx->ccid3hcrx_tfrc); |
| 1203 | val = &hcrx->ccid3hcrx_tfrc; |
| 1204 | break; |
| 1205 | default: |
| 1206 | return -ENOPROTOOPT; |
| 1207 | } |
| 1208 | |
| 1209 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1210 | return -EFAULT; |
| 1211 | |
| 1212 | return 0; |
| 1213 | } |
| 1214 | |
| 1215 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, |
| 1216 | u32 __user *optval, int __user *optlen) |
| 1217 | { |
| 1218 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
| 1219 | const void *val; |
| 1220 | |
| 1221 | /* Listen socks doesn't have a private CCID block */ |
| 1222 | if (sk->sk_state == DCCP_LISTEN) |
| 1223 | return -EINVAL; |
| 1224 | |
| 1225 | switch (optname) { |
| 1226 | case DCCP_SOCKOPT_CCID_TX_INFO: |
| 1227 | if (len < sizeof(hctx->ccid3hctx_tfrc)) |
| 1228 | return -EINVAL; |
| 1229 | len = sizeof(hctx->ccid3hctx_tfrc); |
| 1230 | val = &hctx->ccid3hctx_tfrc; |
| 1231 | break; |
| 1232 | default: |
| 1233 | return -ENOPROTOOPT; |
| 1234 | } |
| 1235 | |
| 1236 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1237 | return -EFAULT; |
| 1238 | |
| 1239 | return 0; |
| 1240 | } |
| 1241 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1242 | static struct ccid_operations ccid3 = { |
Ian McDonald | 3dd9a7c | 2006-09-22 14:26:44 +1200 | [diff] [blame^] | 1243 | .ccid_id = DCCPC_CCID3, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1244 | .ccid_name = "ccid3", |
| 1245 | .ccid_owner = THIS_MODULE, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1246 | .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] | 1247 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
| 1248 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, |
| 1249 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, |
| 1250 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, |
| 1251 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, |
| 1252 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, |
| 1253 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1254 | .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] | 1255 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
| 1256 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, |
| 1257 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, |
| 1258 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1259 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
| 1260 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1261 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
| 1262 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1263 | }; |
| 1264 | |
| 1265 | module_param(ccid3_debug, int, 0444); |
| 1266 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); |
| 1267 | |
| 1268 | static __init int ccid3_module_init(void) |
| 1269 | { |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1270 | int rc = -ENOBUFS; |
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 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
| 1273 | if (ccid3_rx_hist == NULL) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1274 | goto out; |
| 1275 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1276 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
| 1277 | if (ccid3_tx_hist == NULL) |
| 1278 | goto out_free_rx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1279 | |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1280 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
| 1281 | if (ccid3_li_hist == NULL) |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1282 | goto out_free_tx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1283 | |
| 1284 | rc = ccid_register(&ccid3); |
| 1285 | if (rc != 0) |
| 1286 | goto out_free_loss_interval_history; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1287 | out: |
| 1288 | return rc; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1289 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1290 | out_free_loss_interval_history: |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1291 | dccp_li_hist_delete(ccid3_li_hist); |
| 1292 | ccid3_li_hist = NULL; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1293 | out_free_tx: |
| 1294 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1295 | ccid3_tx_hist = NULL; |
| 1296 | out_free_rx: |
| 1297 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1298 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1299 | goto out; |
| 1300 | } |
| 1301 | module_init(ccid3_module_init); |
| 1302 | |
| 1303 | static __exit void ccid3_module_exit(void) |
| 1304 | { |
| 1305 | ccid_unregister(&ccid3); |
| 1306 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1307 | if (ccid3_tx_hist != NULL) { |
| 1308 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1309 | ccid3_tx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1310 | } |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1311 | if (ccid3_rx_hist != NULL) { |
| 1312 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1313 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1314 | } |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1315 | if (ccid3_li_hist != NULL) { |
| 1316 | dccp_li_hist_delete(ccid3_li_hist); |
| 1317 | ccid3_li_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1318 | } |
| 1319 | } |
| 1320 | module_exit(ccid3_module_exit); |
| 1321 | |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 1322 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1323 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1324 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
| 1325 | MODULE_LICENSE("GPL"); |
| 1326 | MODULE_ALIAS("net-dccp-ccid-3"); |