Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/dccp/ccids/ccid3.c |
| 3 | * |
| 4 | * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand. |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 5 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 6 | * |
| 7 | * An implementation of the DCCP protocol |
| 8 | * |
| 9 | * This code has been developed by the University of Waikato WAND |
| 10 | * research group. For further information please see http://www.wand.net.nz/ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 11 | * |
| 12 | * This code also uses code from Lulea University, rereleased as GPL by its |
| 13 | * authors: |
| 14 | * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon |
| 15 | * |
| 16 | * Changes to meet Linux coding standards, to make it meet latest ccid3 draft |
| 17 | * and to make it work as a loadable module in the DCCP stack written by |
| 18 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br>. |
| 19 | * |
| 20 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 21 | * |
| 22 | * This program is free software; you can redistribute it and/or modify |
| 23 | * it under the terms of the GNU General Public License as published by |
| 24 | * the Free Software Foundation; either version 2 of the License, or |
| 25 | * (at your option) any later version. |
| 26 | * |
| 27 | * This program is distributed in the hope that it will be useful, |
| 28 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 29 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 30 | * GNU General Public License for more details. |
| 31 | * |
| 32 | * You should have received a copy of the GNU General Public License |
| 33 | * along with this program; if not, write to the Free Software |
| 34 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 35 | */ |
| 36 | |
| 37 | #include "../ccid.h" |
| 38 | #include "../dccp.h" |
Arnaldo Carvalho de Melo | 4524b25 | 2005-08-27 23:18:26 -0300 | [diff] [blame] | 39 | #include "lib/packet_history.h" |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 40 | #include "lib/loss_interval.h" |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 41 | #include "lib/tfrc.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 42 | #include "ccid3.h" |
| 43 | |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 44 | /* |
Arnaldo Carvalho de Melo | 0ba7a3b | 2005-09-09 02:28:47 -0300 | [diff] [blame] | 45 | * Reason for maths here is to avoid 32 bit overflow when a is big. |
| 46 | * With this we get close to the limit. |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 47 | */ |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 48 | static u32 usecs_div(const u32 a, const u32 b) |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 49 | { |
Arnaldo Carvalho de Melo | 0ba7a3b | 2005-09-09 02:28:47 -0300 | [diff] [blame] | 50 | const u32 div = a < (UINT_MAX / (USEC_PER_SEC / 10)) ? 10 : |
| 51 | a < (UINT_MAX / (USEC_PER_SEC / 50)) ? 50 : |
| 52 | a < (UINT_MAX / (USEC_PER_SEC / 100)) ? 100 : |
| 53 | a < (UINT_MAX / (USEC_PER_SEC / 500)) ? 500 : |
| 54 | a < (UINT_MAX / (USEC_PER_SEC / 1000)) ? 1000 : |
| 55 | a < (UINT_MAX / (USEC_PER_SEC / 5000)) ? 5000 : |
| 56 | a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 : |
| 57 | a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 : |
| 58 | 100000; |
| 59 | const u32 tmp = a * (USEC_PER_SEC / div); |
| 60 | return (b >= 2 * div) ? tmp / (b / div) : tmp; |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 61 | } |
| 62 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 63 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 64 | |
| 65 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
| 66 | static int ccid3_debug; |
| 67 | #define ccid3_pr_debug(format, a...) DCCP_PR_DEBUG(ccid3_debug, format, ##a) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 68 | #else |
| 69 | #define ccid3_pr_debug(format, a...) |
| 70 | #endif |
| 71 | |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 72 | static struct dccp_tx_hist *ccid3_tx_hist; |
| 73 | static struct dccp_rx_hist *ccid3_rx_hist; |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 74 | static struct dccp_li_hist *ccid3_li_hist; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 75 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 76 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 77 | static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) |
| 78 | { |
| 79 | static char *ccid3_state_names[] = { |
| 80 | [TFRC_SSTATE_NO_SENT] = "NO_SENT", |
| 81 | [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", |
| 82 | [TFRC_SSTATE_FBACK] = "FBACK", |
| 83 | [TFRC_SSTATE_TERM] = "TERM", |
| 84 | }; |
| 85 | |
| 86 | return ccid3_state_names[state]; |
| 87 | } |
| 88 | #endif |
| 89 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 90 | static void ccid3_hc_tx_set_state(struct sock *sk, |
| 91 | enum ccid3_hc_tx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 92 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 93 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 94 | enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; |
| 95 | |
| 96 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 97 | dccp_role(sk), sk, ccid3_tx_state_name(oldstate), |
| 98 | ccid3_tx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 99 | WARN_ON(state == oldstate); |
| 100 | hctx->ccid3hctx_state = state; |
| 101 | } |
| 102 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame^] | 103 | /* |
| 104 | * Recalculate scheduled nominal send time t_nom, inter-packet interval |
| 105 | * t_ipi, and delta value. Should be called after each change to X. |
| 106 | */ |
| 107 | static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock *hctx) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 108 | { |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame^] | 109 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 110 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame^] | 111 | /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ |
| 112 | hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_x); |
| 113 | |
| 114 | /* Update nominal send time with regard to the new t_ipi */ |
| 115 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
| 116 | |
| 117 | /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 118 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
| 119 | TFRC_OPSYS_HALF_TIME_GRAN); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 120 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 121 | /* |
| 122 | * Update X by |
| 123 | * If (p > 0) |
| 124 | * x_calc = calcX(s, R, p); |
| 125 | * X = max(min(X_calc, 2 * X_recv), s / t_mbi); |
| 126 | * Else |
| 127 | * If (now - tld >= R) |
| 128 | * X = max(min(2 * X, 2 * X_recv), s / R); |
| 129 | * tld = now; |
| 130 | */ |
| 131 | static void ccid3_hc_tx_update_x(struct sock *sk) |
| 132 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 133 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame^] | 134 | const __u32 old_x = hctx->ccid3hctx_x; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 135 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 136 | /* To avoid large error in calcX */ |
| 137 | if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 138 | hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, |
| 139 | hctx->ccid3hctx_rtt, |
| 140 | hctx->ccid3hctx_p); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 141 | hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, |
| 142 | 2 * hctx->ccid3hctx_x_recv), |
| 143 | (hctx->ccid3hctx_s / |
| 144 | TFRC_MAX_BACK_OFF_TIME)); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 145 | } else { |
| 146 | struct timeval now; |
| 147 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 148 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 149 | if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= |
| 150 | hctx->ccid3hctx_rtt) { |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 151 | hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, |
| 152 | hctx->ccid3hctx_x) * 2, |
| 153 | usecs_div(hctx->ccid3hctx_s, |
| 154 | hctx->ccid3hctx_rtt)); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 155 | hctx->ccid3hctx_t_ld = now; |
| 156 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 157 | } |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame^] | 158 | if (hctx->ccid3hctx_x != old_x) |
| 159 | ccid3_update_send_time(hctx); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 160 | } |
| 161 | |
| 162 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
| 163 | { |
| 164 | struct sock *sk = (struct sock *)data; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 165 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 166 | unsigned long next_tmout = USEC_PER_SEC / 5; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 167 | |
| 168 | bh_lock_sock(sk); |
| 169 | if (sock_owned_by_user(sk)) { |
| 170 | /* Try again later. */ |
| 171 | /* XXX: set some sensible MIB */ |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 172 | goto restart_timer; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 173 | } |
| 174 | |
| 175 | ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, |
| 176 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
| 177 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 178 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 179 | case TFRC_SSTATE_NO_FBACK: |
| 180 | /* Halve send rate */ |
| 181 | hctx->ccid3hctx_x /= 2; |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 182 | if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / |
| 183 | TFRC_MAX_BACK_OFF_TIME)) |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 184 | hctx->ccid3hctx_x = (hctx->ccid3hctx_s / |
| 185 | TFRC_MAX_BACK_OFF_TIME); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 186 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 187 | ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " |
| 188 | "bytes/s\n", |
| 189 | dccp_role(sk), sk, |
| 190 | ccid3_tx_state_name(hctx->ccid3hctx_state), |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 191 | hctx->ccid3hctx_x); |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 192 | /* The value of R is still undefined and so we can not recompute |
| 193 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ |
| 194 | next_tmout = TFRC_INITIAL_TIMEOUT; |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame^] | 195 | ccid3_update_send_time(hctx); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 196 | break; |
| 197 | case TFRC_SSTATE_FBACK: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 198 | /* |
| 199 | * Check if IDLE since last timeout and recv rate is less than |
| 200 | * 4 packets per RTT |
| 201 | */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 202 | if (!hctx->ccid3hctx_idle || |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 203 | (hctx->ccid3hctx_x_recv >= |
| 204 | 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 205 | ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", |
| 206 | dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 207 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
| 208 | /* Halve sending rate */ |
| 209 | |
| 210 | /* If (X_calc > 2 * X_recv) |
| 211 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); |
| 212 | * Else |
| 213 | * X_recv = X_calc / 4; |
| 214 | */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 215 | BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && |
| 216 | hctx->ccid3hctx_x_calc == 0); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 217 | |
| 218 | /* check also if p is zero -> x_calc is infinity? */ |
| 219 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || |
| 220 | hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) |
| 221 | hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, |
| 222 | hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); |
| 223 | else |
| 224 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; |
| 225 | |
| 226 | /* Update sending rate */ |
| 227 | ccid3_hc_tx_update_x(sk); |
| 228 | } |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 229 | /* |
| 230 | * Schedule no feedback timer to expire in |
| 231 | * max(4 * R, 2 * s / X) |
| 232 | */ |
Arnaldo Carvalho de Melo | c68e64c | 2005-08-21 05:07:37 -0300 | [diff] [blame] | 233 | next_tmout = max_t(u32, hctx->ccid3hctx_t_rto, |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 234 | 2 * usecs_div(hctx->ccid3hctx_s, |
| 235 | hctx->ccid3hctx_x)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 236 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 237 | case TFRC_SSTATE_NO_SENT: |
| 238 | DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); |
| 239 | /* fall through */ |
| 240 | case TFRC_SSTATE_TERM: |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 241 | goto out; |
| 242 | } |
| 243 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 244 | hctx->ccid3hctx_idle = 1; |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 245 | |
| 246 | restart_timer: |
| 247 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
| 248 | jiffies + usecs_to_jiffies(next_tmout)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 249 | out: |
| 250 | bh_unlock_sock(sk); |
| 251 | sock_put(sk); |
| 252 | } |
| 253 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 254 | /* |
| 255 | * returns |
| 256 | * > 0: delay (in msecs) that should pass before actually sending |
| 257 | * = 0: can send immediately |
| 258 | * < 0: error condition; do not send packet |
| 259 | */ |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 260 | static int ccid3_hc_tx_send_packet(struct sock *sk, |
| 261 | struct sk_buff *skb, int len) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 262 | { |
| 263 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 264 | 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] | 265 | struct dccp_tx_hist_entry *new_packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 266 | struct timeval now; |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 267 | long delay; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 268 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 269 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 270 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 271 | /* |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 272 | * This function is called only for Data and DataAck packets. Sending |
| 273 | * zero-sized Data(Ack)s is theoretically possible, but for congestion |
| 274 | * control this case is pathological - ignore it. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 275 | */ |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 276 | if (unlikely(len == 0)) |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 277 | return -EBADMSG; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 278 | |
| 279 | /* See if last packet allocated was not sent */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 280 | new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
| 281 | if (new_packet == NULL || new_packet->dccphtx_sent) { |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 282 | new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, |
| 283 | SLAB_ATOMIC); |
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(new_packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 286 | DCCP_WARN("%s, sk=%p, not enough mem to add to history," |
| 287 | "send refused\n", dccp_role(sk), sk); |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 288 | return -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 289 | } |
| 290 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 291 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 292 | } |
| 293 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 294 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 295 | |
| 296 | switch (hctx->ccid3hctx_state) { |
| 297 | case TFRC_SSTATE_NO_SENT: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 298 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
| 299 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 300 | hctx->ccid3hctx_last_win_count = 0; |
| 301 | hctx->ccid3hctx_t_last_win_count = now; |
| 302 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 303 | |
Gerrit Renker | 90feeb9 | 2006-11-27 12:13:38 -0200 | [diff] [blame] | 304 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
| 305 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; |
| 306 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ |
| 307 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; |
| 308 | |
| 309 | /* Set t_0 for initial packet */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 310 | hctx->ccid3hctx_t_nom = now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 311 | break; |
| 312 | case TFRC_SSTATE_NO_FBACK: |
| 313 | case TFRC_SSTATE_FBACK: |
Gerrit Renker | 91cf5a1 | 2006-11-27 12:25:10 -0200 | [diff] [blame] | 314 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
| 315 | /* |
| 316 | * Scheduling of packet transmissions [RFC 3448, 4.6] |
| 317 | * |
| 318 | * if (t_now > t_nom - delta) |
| 319 | * // send the packet now |
| 320 | * else |
| 321 | * // send the packet in (t_nom - t_now) milliseconds. |
| 322 | */ |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 323 | if (delay >= hctx->ccid3hctx_delta) |
| 324 | return delay / 1000L; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 325 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 326 | case TFRC_SSTATE_TERM: |
| 327 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 328 | return -EINVAL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 329 | } |
| 330 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 331 | /* prepare to send now (add options etc.) */ |
| 332 | dp->dccps_hc_tx_insert_options = 1; |
| 333 | new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = |
| 334 | hctx->ccid3hctx_last_win_count; |
| 335 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
| 336 | |
| 337 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) |
| 341 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 342 | const struct dccp_sock *dp = dccp_sk(sk); |
| 343 | 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] | 344 | struct timeval now; |
| 345 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 346 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 347 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 348 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 349 | |
| 350 | /* check if we have sent a data packet */ |
| 351 | if (len > 0) { |
| 352 | unsigned long quarter_rtt; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 353 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 354 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 355 | packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 356 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 357 | DCCP_WARN("packet doesn't exist in history!\n"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 358 | return; |
| 359 | } |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 360 | if (unlikely(packet->dccphtx_sent)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 361 | DCCP_WARN("no unsent packet in history!\n"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 362 | return; |
| 363 | } |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 364 | packet->dccphtx_tstamp = now; |
| 365 | packet->dccphtx_seqno = dp->dccps_gss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 366 | /* |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 367 | * Check if win_count have changed |
Gerrit Renker | 0e64e94 | 2006-10-24 16:17:51 -0700 | [diff] [blame] | 368 | * Algorithm in "8.1. Window Counter Value" in RFC 4342. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 369 | */ |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 370 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); |
| 371 | if (likely(hctx->ccid3hctx_rtt > 8)) |
| 372 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; |
| 373 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 374 | if (quarter_rtt > 0) { |
| 375 | hctx->ccid3hctx_t_last_win_count = now; |
| 376 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + |
| 377 | min_t(unsigned long, quarter_rtt, 5)) % 16; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 378 | ccid3_pr_debug("%s, sk=%p, window changed from " |
| 379 | "%u to %u!\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 380 | dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 381 | packet->dccphtx_ccval, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 382 | hctx->ccid3hctx_last_win_count); |
| 383 | } |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 384 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 385 | hctx->ccid3hctx_idle = 0; |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 386 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 387 | packet->dccphtx_sent = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 388 | } else |
| 389 | ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", |
| 390 | dccp_role(sk), sk, dp->dccps_gss); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 391 | } |
| 392 | |
| 393 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 394 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 395 | const struct dccp_sock *dp = dccp_sk(sk); |
| 396 | 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] | 397 | struct ccid3_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 398 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 399 | struct timeval now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 400 | unsigned long next_tmout; |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 401 | u32 t_elapsed; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 402 | u32 pinv; |
| 403 | u32 x_recv; |
| 404 | u32 r_sample; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 405 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 406 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 407 | |
| 408 | /* we are only interested in ACKs */ |
| 409 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || |
| 410 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) |
| 411 | return; |
| 412 | |
| 413 | opt_recv = &hctx->ccid3hctx_options_received; |
| 414 | |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 415 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 416 | x_recv = opt_recv->ccid3or_receive_rate; |
| 417 | pinv = opt_recv->ccid3or_loss_event_rate; |
| 418 | |
| 419 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 420 | case TFRC_SSTATE_NO_FBACK: |
| 421 | case TFRC_SSTATE_FBACK: |
| 422 | /* Calculate new round trip sample by |
| 423 | * R_sample = (now - t_recvdata) - t_delay */ |
| 424 | /* get t_recvdata from history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 425 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
| 426 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 427 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 428 | DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " |
| 429 | "in history!\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 430 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 431 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 432 | return; |
| 433 | } |
| 434 | |
| 435 | /* Update RTT */ |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 436 | dccp_timestamp(sk, &now); |
| 437 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 438 | if (unlikely(r_sample <= t_elapsed)) |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 439 | DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", |
| 440 | r_sample, t_elapsed); |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 441 | else |
| 442 | r_sample -= t_elapsed; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 443 | |
| 444 | /* Update RTT estimate by |
| 445 | * If (No feedback recv) |
| 446 | * R = R_sample; |
| 447 | * Else |
| 448 | * R = q * R + (1 - q) * R_sample; |
| 449 | * |
| 450 | * q is a constant, RFC 3448 recomments 0.9 |
| 451 | */ |
| 452 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { |
| 453 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
| 454 | hctx->ccid3hctx_rtt = r_sample; |
| 455 | } else |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 456 | hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + |
| 457 | r_sample / 10; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 458 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 459 | ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " |
| 460 | "r_sample=%us\n", dccp_role(sk), sk, |
| 461 | hctx->ccid3hctx_rtt, r_sample); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 462 | |
| 463 | /* Update timeout interval */ |
Arnaldo Carvalho de Melo | c68e64c | 2005-08-21 05:07:37 -0300 | [diff] [blame] | 464 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
| 465 | USEC_PER_SEC); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 466 | |
| 467 | /* Update receive rate */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 468 | 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] | 469 | |
| 470 | /* Update loss event rate */ |
| 471 | if (pinv == ~0 || pinv == 0) |
| 472 | hctx->ccid3hctx_p = 0; |
| 473 | else { |
| 474 | hctx->ccid3hctx_p = 1000000 / pinv; |
| 475 | |
| 476 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { |
| 477 | hctx->ccid3hctx_p = TFRC_SMALLEST_P; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 478 | ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", |
| 479 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 480 | } |
| 481 | } |
| 482 | |
| 483 | /* unschedule no feedback timer */ |
| 484 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 485 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame^] | 486 | /* Update sending rate (and likely t_ipi, t_nom, and delta) */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 487 | ccid3_hc_tx_update_x(sk); |
| 488 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 489 | /* remove all packets older than the one acked from history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 490 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
| 491 | &hctx->ccid3hctx_hist, packet); |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 492 | /* |
| 493 | * As we have calculated new ipi, delta, t_nom it is possible that |
| 494 | * we now can send a packet, so wake up dccp_wait_for_ccids. |
| 495 | */ |
| 496 | sk->sk_write_space(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 497 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 498 | /* |
| 499 | * Schedule no feedback timer to expire in |
| 500 | * max(4 * R, 2 * s / X) |
| 501 | */ |
Arnaldo Carvalho de Melo | c68e64c | 2005-08-21 05:07:37 -0300 | [diff] [blame] | 502 | next_tmout = max(hctx->ccid3hctx_t_rto, |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 503 | 2 * usecs_div(hctx->ccid3hctx_s, |
| 504 | hctx->ccid3hctx_x)); |
| 505 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 506 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
| 507 | "expire in %lu jiffies (%luus)\n", |
| 508 | dccp_role(sk), sk, |
| 509 | usecs_to_jiffies(next_tmout), next_tmout); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 510 | |
| 511 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 512 | jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 513 | |
| 514 | /* set idle flag */ |
| 515 | hctx->ccid3hctx_idle = 1; |
| 516 | break; |
Gerrit Renker | 5e19e3f | 2006-11-27 12:28:48 -0200 | [diff] [blame] | 517 | case TFRC_SSTATE_NO_SENT: |
| 518 | DCCP_WARN("Illegal ACK received - no packet has been sent\n"); |
| 519 | /* fall through */ |
| 520 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 521 | break; |
| 522 | } |
| 523 | } |
| 524 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 525 | 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] | 526 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 527 | 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] | 528 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 529 | BUG_ON(hctx == NULL); |
| 530 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 531 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
| 532 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; |
| 533 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 534 | } |
| 535 | |
| 536 | 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] | 537 | unsigned char len, u16 idx, |
| 538 | unsigned char *value) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 539 | { |
| 540 | int rc = 0; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 541 | const struct dccp_sock *dp = dccp_sk(sk); |
| 542 | 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] | 543 | struct ccid3_options_received *opt_recv; |
| 544 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 545 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 546 | |
| 547 | opt_recv = &hctx->ccid3hctx_options_received; |
| 548 | |
| 549 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { |
| 550 | opt_recv->ccid3or_seqno = dp->dccps_gsr; |
| 551 | opt_recv->ccid3or_loss_event_rate = ~0; |
| 552 | opt_recv->ccid3or_loss_intervals_idx = 0; |
| 553 | opt_recv->ccid3or_loss_intervals_len = 0; |
| 554 | opt_recv->ccid3or_receive_rate = 0; |
| 555 | } |
| 556 | |
| 557 | switch (option) { |
| 558 | case TFRC_OPT_LOSS_EVENT_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 559 | if (unlikely(len != 4)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 560 | DCCP_WARN("%s, sk=%p, invalid len %d " |
| 561 | "for TFRC_OPT_LOSS_EVENT_RATE\n", |
| 562 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 563 | rc = -EINVAL; |
| 564 | } else { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 565 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 566 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
| 567 | dccp_role(sk), sk, |
| 568 | opt_recv->ccid3or_loss_event_rate); |
| 569 | } |
| 570 | break; |
| 571 | case TFRC_OPT_LOSS_INTERVALS: |
| 572 | opt_recv->ccid3or_loss_intervals_idx = idx; |
| 573 | opt_recv->ccid3or_loss_intervals_len = len; |
| 574 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", |
| 575 | dccp_role(sk), sk, |
| 576 | opt_recv->ccid3or_loss_intervals_idx, |
| 577 | opt_recv->ccid3or_loss_intervals_len); |
| 578 | break; |
| 579 | case TFRC_OPT_RECEIVE_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 580 | if (unlikely(len != 4)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 581 | DCCP_WARN("%s, sk=%p, invalid len %d " |
| 582 | "for TFRC_OPT_RECEIVE_RATE\n", |
| 583 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 584 | rc = -EINVAL; |
| 585 | } else { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 586 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 587 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
| 588 | dccp_role(sk), sk, |
| 589 | opt_recv->ccid3or_receive_rate); |
| 590 | } |
| 591 | break; |
| 592 | } |
| 593 | |
| 594 | return rc; |
| 595 | } |
| 596 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 597 | 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] | 598 | { |
| 599 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 600 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 601 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 602 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
| 603 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) |
| 604 | hctx->ccid3hctx_s = dp->dccps_packet_size; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 605 | else |
| 606 | hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; |
| 607 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 608 | /* Set transmission rate to 1 packet per second */ |
| 609 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; |
Arnaldo Carvalho de Melo | c68e64c | 2005-08-21 05:07:37 -0300 | [diff] [blame] | 610 | hctx->ccid3hctx_t_rto = USEC_PER_SEC; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 611 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
| 612 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | aa5d7df | 2006-03-20 17:35:13 -0800 | [diff] [blame] | 613 | |
| 614 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; |
| 615 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 616 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
| 617 | |
| 618 | return 0; |
| 619 | } |
| 620 | |
| 621 | static void ccid3_hc_tx_exit(struct sock *sk) |
| 622 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 623 | 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] | 624 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 625 | BUG_ON(hctx == NULL); |
| 626 | |
| 627 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); |
| 628 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 629 | |
| 630 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 631 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 632 | } |
| 633 | |
| 634 | /* |
| 635 | * RX Half Connection methods |
| 636 | */ |
| 637 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 638 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 639 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
| 640 | { |
| 641 | static char *ccid3_rx_state_names[] = { |
| 642 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", |
| 643 | [TFRC_RSTATE_DATA] = "DATA", |
| 644 | [TFRC_RSTATE_TERM] = "TERM", |
| 645 | }; |
| 646 | |
| 647 | return ccid3_rx_state_names[state]; |
| 648 | } |
| 649 | #endif |
| 650 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 651 | static void ccid3_hc_rx_set_state(struct sock *sk, |
| 652 | enum ccid3_hc_rx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 653 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 654 | 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] | 655 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
| 656 | |
| 657 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 658 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
| 659 | ccid3_rx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 660 | WARN_ON(state == oldstate); |
| 661 | hcrx->ccid3hcrx_state = state; |
| 662 | } |
| 663 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 664 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
| 665 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 666 | 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] | 667 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 668 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 669 | struct timeval now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 670 | |
| 671 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); |
| 672 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 673 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 674 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 675 | switch (hcrx->ccid3hcrx_state) { |
| 676 | case TFRC_RSTATE_NO_DATA: |
| 677 | hcrx->ccid3hcrx_x_recv = 0; |
| 678 | break; |
| 679 | case TFRC_RSTATE_DATA: { |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 680 | const u32 delta = timeval_delta(&now, |
| 681 | &hcrx->ccid3hcrx_tstamp_last_feedback); |
Arnaldo Carvalho de Melo | 27ae543e | 2005-09-09 02:31:07 -0300 | [diff] [blame] | 682 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
| 683 | delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 684 | } |
| 685 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 686 | case TFRC_RSTATE_TERM: |
| 687 | 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] | 688 | return; |
| 689 | } |
| 690 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 691 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 692 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 693 | DCCP_WARN("%s, sk=%p, no data packet in history!\n", |
| 694 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 695 | return; |
| 696 | } |
| 697 | |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 698 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 699 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 700 | hcrx->ccid3hcrx_bytes_recv = 0; |
| 701 | |
| 702 | /* Convert to multiples of 10us */ |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 703 | hcrx->ccid3hcrx_elapsed_time = |
| 704 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 705 | if (hcrx->ccid3hcrx_p == 0) |
| 706 | hcrx->ccid3hcrx_pinv = ~0; |
| 707 | else |
| 708 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 709 | dp->dccps_hc_rx_insert_options = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 710 | dccp_send_ack(sk); |
| 711 | } |
| 712 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 713 | 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] | 714 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 715 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 716 | __be32 x_recv, pinv; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 717 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 718 | BUG_ON(hcrx == NULL); |
| 719 | |
| 720 | 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] | 721 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 722 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 723 | 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] | 724 | |
| 725 | if (dccp_packet_without_ack(skb)) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 726 | return 0; |
| 727 | |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 728 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
| 729 | pinv = htonl(hcrx->ccid3hcrx_pinv); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 730 | |
| 731 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && |
| 732 | dccp_insert_option_elapsed_time(sk, skb, |
| 733 | hcrx->ccid3hcrx_elapsed_time)) || |
| 734 | dccp_insert_option_timestamp(sk, skb) || |
| 735 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, |
| 736 | &pinv, sizeof(pinv)) || |
| 737 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, |
| 738 | &x_recv, sizeof(x_recv))) |
| 739 | return -1; |
| 740 | |
| 741 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 742 | } |
| 743 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 744 | /* calculate first loss interval |
| 745 | * |
| 746 | * returns estimated loss interval in usecs */ |
| 747 | |
| 748 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) |
| 749 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 750 | 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] | 751 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 752 | u32 rtt, delta, x_recv, fval, p, tmp2; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 753 | struct timeval tstamp = { 0, }; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 754 | int interval = 0; |
| 755 | int win_count = 0; |
| 756 | int step = 0; |
| 757 | u64 tmp1; |
| 758 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 759 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
| 760 | dccphrx_node) { |
| 761 | if (dccp_rx_hist_entry_data_packet(entry)) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 762 | tail = entry; |
| 763 | |
| 764 | switch (step) { |
| 765 | case 0: |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 766 | tstamp = entry->dccphrx_tstamp; |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 767 | win_count = entry->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 768 | step = 1; |
| 769 | break; |
| 770 | case 1: |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 771 | interval = win_count - entry->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 772 | if (interval < 0) |
| 773 | interval += TFRC_WIN_COUNT_LIMIT; |
| 774 | if (interval > 4) |
| 775 | goto found; |
| 776 | break; |
| 777 | } |
| 778 | } |
| 779 | } |
| 780 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 781 | if (unlikely(step == 0)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 782 | DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", |
| 783 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 784 | return ~0; |
| 785 | } |
| 786 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 787 | if (unlikely(interval == 0)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 788 | DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." |
| 789 | "Defaulting to 1\n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 790 | interval = 1; |
| 791 | } |
| 792 | found: |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 793 | if (!tail) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 794 | DCCP_CRIT("tail is null\n"); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 795 | return ~0; |
| 796 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 797 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 798 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
| 799 | dccp_role(sk), sk, rtt); |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 800 | |
| 801 | if (rtt == 0) { |
| 802 | DCCP_WARN("RTT==0, setting to 1\n"); |
| 803 | rtt = 1; |
| 804 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 805 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 806 | dccp_timestamp(sk, &tstamp); |
| 807 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); |
| 808 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 809 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 810 | if (x_recv == 0) |
| 811 | x_recv = hcrx->ccid3hcrx_x_recv; |
| 812 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 813 | tmp1 = (u64)x_recv * (u64)rtt; |
| 814 | do_div(tmp1,10000000); |
| 815 | tmp2 = (u32)tmp1; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 816 | |
| 817 | if (!tmp2) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 818 | 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] | 819 | return ~0; |
| 820 | } |
| 821 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 822 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
| 823 | /* 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] | 824 | p = tfrc_calc_x_reverse_lookup(fval); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 825 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
| 826 | "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] | 827 | |
| 828 | if (p == 0) |
| 829 | return ~0; |
| 830 | else |
| 831 | return 1000000 / p; |
| 832 | } |
| 833 | |
| 834 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) |
| 835 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 836 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 837 | struct dccp_li_hist_entry *head; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 838 | u64 seq_temp; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 839 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 840 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 841 | if (!dccp_li_hist_interval_new(ccid3_li_hist, |
| 842 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 843 | return; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 844 | |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 845 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
| 846 | struct dccp_li_hist_entry, dccplih_node); |
| 847 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 848 | } else { |
| 849 | struct dccp_li_hist_entry *entry; |
| 850 | struct list_head *tail; |
| 851 | |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 852 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
| 853 | struct dccp_li_hist_entry, dccplih_node); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 854 | /* FIXME win count check removed as was wrong */ |
| 855 | /* should make this check with receive history */ |
| 856 | /* and compare there as per section 10.2 of RFC4342 */ |
| 857 | |
| 858 | /* new loss event detected */ |
| 859 | /* calculate last interval length */ |
| 860 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); |
| 861 | entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); |
| 862 | |
| 863 | if (entry == NULL) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 864 | DCCP_BUG("out of memory - can not allocate entry"); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 865 | return; |
| 866 | } |
| 867 | |
| 868 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); |
| 869 | |
| 870 | tail = hcrx->ccid3hcrx_li_hist.prev; |
| 871 | list_del(tail); |
| 872 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); |
| 873 | |
| 874 | /* Create the newest interval */ |
| 875 | entry->dccplih_seqno = seq_loss; |
| 876 | entry->dccplih_interval = seq_temp; |
| 877 | entry->dccplih_win_count = win_loss; |
| 878 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 879 | } |
| 880 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 881 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
| 882 | struct dccp_rx_hist_entry *packet) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 883 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 884 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 885 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
| 886 | u64 seqno = packet->dccphrx_seqno; |
| 887 | u64 tmp_seqno; |
| 888 | int loss = 0; |
| 889 | u8 ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 890 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 891 | |
| 892 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 893 | |
| 894 | if (!rx_hist || |
| 895 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 896 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 897 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 898 | goto detect_out; |
| 899 | } |
| 900 | |
| 901 | |
| 902 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
| 903 | > TFRC_RECV_NUM_LATE_LOSS) { |
| 904 | loss = 1; |
| 905 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, |
| 906 | hcrx->ccid3hcrx_ccval_nonloss); |
| 907 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 908 | dccp_inc_seqno(&tmp_seqno); |
| 909 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 910 | dccp_inc_seqno(&tmp_seqno); |
| 911 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, |
| 912 | tmp_seqno, &ccval)) { |
| 913 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 914 | hcrx->ccid3hcrx_ccval_nonloss = ccval; |
| 915 | dccp_inc_seqno(&tmp_seqno); |
| 916 | } |
| 917 | } |
| 918 | |
| 919 | /* FIXME - this code could be simplified with above while */ |
| 920 | /* but works at moment */ |
| 921 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 922 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 923 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 924 | } |
| 925 | |
| 926 | detect_out: |
| 927 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, |
| 928 | &hcrx->ccid3hcrx_li_hist, packet, |
| 929 | hcrx->ccid3hcrx_seqno_nonloss); |
| 930 | return loss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 931 | } |
| 932 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 933 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 934 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 935 | 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] | 936 | const struct dccp_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 937 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 938 | struct timeval now; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 939 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
| 940 | int loss; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 941 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 942 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 943 | |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 944 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 945 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 946 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
| 947 | case DCCP_PKT_ACK: |
| 948 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 949 | return; |
| 950 | case DCCP_PKT_DATAACK: |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 951 | if (opt_recv->dccpor_timestamp_echo == 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 952 | break; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 953 | rtt_prev = hcrx->ccid3hcrx_rtt; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 954 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 955 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
| 956 | r_sample = timeval_usecs(&now); |
| 957 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; |
| 958 | |
| 959 | if (unlikely(r_sample <= t_elapsed)) |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 960 | DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", |
| 961 | r_sample, t_elapsed); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 962 | else |
| 963 | r_sample -= t_elapsed; |
| 964 | |
| 965 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 966 | hcrx->ccid3hcrx_rtt = r_sample; |
| 967 | else |
| 968 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + |
| 969 | r_sample / 10; |
| 970 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 971 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
| 972 | 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] | 973 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
| 974 | opt_recv->dccpor_elapsed_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 975 | break; |
| 976 | case DCCP_PKT_DATA: |
| 977 | break; |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 978 | 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] | 979 | return; |
| 980 | } |
| 981 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 982 | 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] | 983 | skb, SLAB_ATOMIC); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 984 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 985 | DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " |
| 986 | "to history, consider it lost!\n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 987 | return; |
| 988 | } |
| 989 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 990 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 991 | |
| 992 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) |
| 993 | return; |
| 994 | |
| 995 | switch (hcrx->ccid3hcrx_state) { |
| 996 | case TFRC_RSTATE_NO_DATA: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 997 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
| 998 | "feedback\n", |
| 999 | dccp_role(sk), sk, |
| 1000 | dccp_state_name(sk->sk_state), skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1001 | ccid3_hc_rx_send_feedback(sk); |
| 1002 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); |
| 1003 | return; |
| 1004 | case TFRC_RSTATE_DATA: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1005 | hcrx->ccid3hcrx_bytes_recv += skb->len - |
| 1006 | dccp_hdr(skb)->dccph_doff * 4; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1007 | if (loss) |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1008 | break; |
| 1009 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1010 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1011 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
| 1012 | hcrx->ccid3hcrx_rtt) { |
| 1013 | hcrx->ccid3hcrx_tstamp_last_ack = now; |
| 1014 | ccid3_hc_rx_send_feedback(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1015 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1016 | return; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1017 | case TFRC_RSTATE_TERM: |
| 1018 | 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] | 1019 | return; |
| 1020 | } |
| 1021 | |
| 1022 | /* Dealing with packet loss */ |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1023 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
| 1024 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1025 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1026 | p_prev = hcrx->ccid3hcrx_p; |
| 1027 | |
| 1028 | /* Calculate loss event rate */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1029 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 1030 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); |
| 1031 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1032 | /* Scaling up by 1000000 as fixed decimal */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1033 | if (i_mean != 0) |
| 1034 | hcrx->ccid3hcrx_p = 1000000 / i_mean; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1035 | } else |
| 1036 | DCCP_BUG("empty loss history"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1037 | |
| 1038 | if (hcrx->ccid3hcrx_p > p_prev) { |
| 1039 | ccid3_hc_rx_send_feedback(sk); |
| 1040 | return; |
| 1041 | } |
| 1042 | } |
| 1043 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1044 | 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] | 1045 | { |
| 1046 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1047 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1048 | |
| 1049 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); |
| 1050 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 1051 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
| 1052 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) |
| 1053 | hcrx->ccid3hcrx_s = dp->dccps_packet_size; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1054 | else |
| 1055 | hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; |
| 1056 | |
| 1057 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
| 1058 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1059 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1060 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
Arnaldo Carvalho de Melo | 954ee31 | 2005-09-09 02:37:05 -0300 | [diff] [blame] | 1061 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
| 1062 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1063 | return 0; |
| 1064 | } |
| 1065 | |
| 1066 | static void ccid3_hc_rx_exit(struct sock *sk) |
| 1067 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1068 | 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] | 1069 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1070 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1071 | |
| 1072 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); |
| 1073 | |
| 1074 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1075 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1076 | |
| 1077 | /* Empty loss interval history */ |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1078 | 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] | 1079 | } |
| 1080 | |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1081 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
| 1082 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1083 | 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] | 1084 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1085 | /* Listen socks doesn't have a private CCID block */ |
| 1086 | if (sk->sk_state == DCCP_LISTEN) |
| 1087 | return; |
| 1088 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1089 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1090 | |
| 1091 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; |
| 1092 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; |
| 1093 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; |
| 1094 | } |
| 1095 | |
| 1096 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) |
| 1097 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1098 | 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] | 1099 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1100 | /* Listen socks doesn't have a private CCID block */ |
| 1101 | if (sk->sk_state == DCCP_LISTEN) |
| 1102 | return; |
| 1103 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1104 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1105 | |
| 1106 | info->tcpi_rto = hctx->ccid3hctx_t_rto; |
| 1107 | info->tcpi_rtt = hctx->ccid3hctx_rtt; |
| 1108 | } |
| 1109 | |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1110 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
| 1111 | u32 __user *optval, int __user *optlen) |
| 1112 | { |
| 1113 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
| 1114 | const void *val; |
| 1115 | |
| 1116 | /* Listen socks doesn't have a private CCID block */ |
| 1117 | if (sk->sk_state == DCCP_LISTEN) |
| 1118 | return -EINVAL; |
| 1119 | |
| 1120 | switch (optname) { |
| 1121 | case DCCP_SOCKOPT_CCID_RX_INFO: |
| 1122 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) |
| 1123 | return -EINVAL; |
| 1124 | len = sizeof(hcrx->ccid3hcrx_tfrc); |
| 1125 | val = &hcrx->ccid3hcrx_tfrc; |
| 1126 | break; |
| 1127 | default: |
| 1128 | return -ENOPROTOOPT; |
| 1129 | } |
| 1130 | |
| 1131 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1132 | return -EFAULT; |
| 1133 | |
| 1134 | return 0; |
| 1135 | } |
| 1136 | |
| 1137 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, |
| 1138 | u32 __user *optval, int __user *optlen) |
| 1139 | { |
| 1140 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
| 1141 | const void *val; |
| 1142 | |
| 1143 | /* Listen socks doesn't have a private CCID block */ |
| 1144 | if (sk->sk_state == DCCP_LISTEN) |
| 1145 | return -EINVAL; |
| 1146 | |
| 1147 | switch (optname) { |
| 1148 | case DCCP_SOCKOPT_CCID_TX_INFO: |
| 1149 | if (len < sizeof(hctx->ccid3hctx_tfrc)) |
| 1150 | return -EINVAL; |
| 1151 | len = sizeof(hctx->ccid3hctx_tfrc); |
| 1152 | val = &hctx->ccid3hctx_tfrc; |
| 1153 | break; |
| 1154 | default: |
| 1155 | return -ENOPROTOOPT; |
| 1156 | } |
| 1157 | |
| 1158 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1159 | return -EFAULT; |
| 1160 | |
| 1161 | return 0; |
| 1162 | } |
| 1163 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1164 | static struct ccid_operations ccid3 = { |
Ian McDonald | 3dd9a7c | 2006-09-22 14:26:44 +1200 | [diff] [blame] | 1165 | .ccid_id = DCCPC_CCID3, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1166 | .ccid_name = "ccid3", |
| 1167 | .ccid_owner = THIS_MODULE, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1168 | .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] | 1169 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
| 1170 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, |
| 1171 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, |
| 1172 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, |
| 1173 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, |
| 1174 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, |
| 1175 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1176 | .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] | 1177 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
| 1178 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, |
| 1179 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, |
| 1180 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1181 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
| 1182 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1183 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
| 1184 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1185 | }; |
| 1186 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1187 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1188 | module_param(ccid3_debug, int, 0444); |
| 1189 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1190 | #endif |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1191 | |
| 1192 | static __init int ccid3_module_init(void) |
| 1193 | { |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1194 | int rc = -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1195 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1196 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
| 1197 | if (ccid3_rx_hist == NULL) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1198 | goto out; |
| 1199 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1200 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
| 1201 | if (ccid3_tx_hist == NULL) |
| 1202 | goto out_free_rx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1203 | |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1204 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
| 1205 | if (ccid3_li_hist == NULL) |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1206 | goto out_free_tx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1207 | |
| 1208 | rc = ccid_register(&ccid3); |
| 1209 | if (rc != 0) |
| 1210 | goto out_free_loss_interval_history; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1211 | out: |
| 1212 | return rc; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1213 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1214 | out_free_loss_interval_history: |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1215 | dccp_li_hist_delete(ccid3_li_hist); |
| 1216 | ccid3_li_hist = NULL; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1217 | out_free_tx: |
| 1218 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1219 | ccid3_tx_hist = NULL; |
| 1220 | out_free_rx: |
| 1221 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1222 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1223 | goto out; |
| 1224 | } |
| 1225 | module_init(ccid3_module_init); |
| 1226 | |
| 1227 | static __exit void ccid3_module_exit(void) |
| 1228 | { |
| 1229 | ccid_unregister(&ccid3); |
| 1230 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1231 | if (ccid3_tx_hist != NULL) { |
| 1232 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1233 | ccid3_tx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1234 | } |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1235 | if (ccid3_rx_hist != NULL) { |
| 1236 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1237 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1238 | } |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1239 | if (ccid3_li_hist != NULL) { |
| 1240 | dccp_li_hist_delete(ccid3_li_hist); |
| 1241 | ccid3_li_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1242 | } |
| 1243 | } |
| 1244 | module_exit(ccid3_module_exit); |
| 1245 | |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 1246 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1247 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1248 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
| 1249 | MODULE_LICENSE("GPL"); |
| 1250 | MODULE_ALIAS("net-dccp-ccid-3"); |