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 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 103 | /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ |
| 104 | static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx) |
| 105 | { |
Gerrit Renker | f5c2d63 | 2006-11-27 12:22:48 -0200 | [diff] [blame] | 106 | hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_x); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ |
| 110 | static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx) |
| 111 | { |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 112 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
| 113 | TFRC_OPSYS_HALF_TIME_GRAN); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | /* |
| 117 | * Update X by |
| 118 | * If (p > 0) |
| 119 | * x_calc = calcX(s, R, p); |
| 120 | * X = max(min(X_calc, 2 * X_recv), s / t_mbi); |
| 121 | * Else |
| 122 | * If (now - tld >= R) |
| 123 | * X = max(min(2 * X, 2 * X_recv), s / R); |
| 124 | * tld = now; |
| 125 | */ |
| 126 | static void ccid3_hc_tx_update_x(struct sock *sk) |
| 127 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 128 | 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] | 129 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 130 | /* To avoid large error in calcX */ |
| 131 | if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 132 | hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, |
| 133 | hctx->ccid3hctx_rtt, |
| 134 | hctx->ccid3hctx_p); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 135 | hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, |
| 136 | 2 * hctx->ccid3hctx_x_recv), |
| 137 | (hctx->ccid3hctx_s / |
| 138 | TFRC_MAX_BACK_OFF_TIME)); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 139 | } else { |
| 140 | struct timeval now; |
| 141 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 142 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 143 | if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= |
| 144 | hctx->ccid3hctx_rtt) { |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 145 | hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, |
| 146 | hctx->ccid3hctx_x) * 2, |
| 147 | usecs_div(hctx->ccid3hctx_s, |
| 148 | hctx->ccid3hctx_rtt)); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 149 | hctx->ccid3hctx_t_ld = now; |
| 150 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 151 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
| 155 | { |
| 156 | struct sock *sk = (struct sock *)data; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 157 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame^] | 158 | unsigned long next_tmout = USEC_PER_SEC / 5; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 159 | |
| 160 | bh_lock_sock(sk); |
| 161 | if (sock_owned_by_user(sk)) { |
| 162 | /* Try again later. */ |
| 163 | /* XXX: set some sensible MIB */ |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame^] | 164 | goto restart_timer; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, |
| 168 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
| 169 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 170 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 171 | case TFRC_SSTATE_NO_FBACK: |
| 172 | /* Halve send rate */ |
| 173 | hctx->ccid3hctx_x /= 2; |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 174 | if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / |
| 175 | TFRC_MAX_BACK_OFF_TIME)) |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 176 | hctx->ccid3hctx_x = (hctx->ccid3hctx_s / |
| 177 | TFRC_MAX_BACK_OFF_TIME); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 178 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 179 | ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " |
| 180 | "bytes/s\n", |
| 181 | dccp_role(sk), sk, |
| 182 | ccid3_tx_state_name(hctx->ccid3hctx_state), |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 183 | hctx->ccid3hctx_x); |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame^] | 184 | /* The value of R is still undefined and so we can not recompute |
| 185 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ |
| 186 | next_tmout = TFRC_INITIAL_TIMEOUT; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 187 | /* |
| 188 | * FIXME - not sure above calculation is correct. See section |
| 189 | * 5 of CCID3 11 should adjust tx_t_ipi and double that to |
| 190 | * achieve it really |
| 191 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 192 | break; |
| 193 | case TFRC_SSTATE_FBACK: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 194 | /* |
| 195 | * Check if IDLE since last timeout and recv rate is less than |
| 196 | * 4 packets per RTT |
| 197 | */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 198 | if (!hctx->ccid3hctx_idle || |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 199 | (hctx->ccid3hctx_x_recv >= |
| 200 | 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 201 | ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", |
| 202 | dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 203 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
| 204 | /* Halve sending rate */ |
| 205 | |
| 206 | /* If (X_calc > 2 * X_recv) |
| 207 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); |
| 208 | * Else |
| 209 | * X_recv = X_calc / 4; |
| 210 | */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 211 | BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && |
| 212 | hctx->ccid3hctx_x_calc == 0); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 213 | |
| 214 | /* check also if p is zero -> x_calc is infinity? */ |
| 215 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || |
| 216 | hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) |
| 217 | hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, |
| 218 | hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); |
| 219 | else |
| 220 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; |
| 221 | |
| 222 | /* Update sending rate */ |
| 223 | ccid3_hc_tx_update_x(sk); |
| 224 | } |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 225 | /* |
| 226 | * Schedule no feedback timer to expire in |
| 227 | * max(4 * R, 2 * s / X) |
| 228 | */ |
Arnaldo Carvalho de Melo | c68e64c | 2005-08-21 05:07:37 -0300 | [diff] [blame] | 229 | next_tmout = max_t(u32, hctx->ccid3hctx_t_rto, |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 230 | 2 * usecs_div(hctx->ccid3hctx_s, |
| 231 | hctx->ccid3hctx_x)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 232 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 233 | case TFRC_SSTATE_NO_SENT: |
| 234 | DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); |
| 235 | /* fall through */ |
| 236 | case TFRC_SSTATE_TERM: |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 237 | goto out; |
| 238 | } |
| 239 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 240 | hctx->ccid3hctx_idle = 1; |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame^] | 241 | |
| 242 | restart_timer: |
| 243 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
| 244 | jiffies + usecs_to_jiffies(next_tmout)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 245 | out: |
| 246 | bh_unlock_sock(sk); |
| 247 | sock_put(sk); |
| 248 | } |
| 249 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 250 | /* |
| 251 | * returns |
| 252 | * > 0: delay (in msecs) that should pass before actually sending |
| 253 | * = 0: can send immediately |
| 254 | * < 0: error condition; do not send packet |
| 255 | */ |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 256 | static int ccid3_hc_tx_send_packet(struct sock *sk, |
| 257 | struct sk_buff *skb, int len) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 258 | { |
| 259 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 260 | 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] | 261 | struct dccp_tx_hist_entry *new_packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 262 | struct timeval now; |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 263 | long delay; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 264 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 265 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 266 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 267 | /* |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 268 | * This function is called only for Data and DataAck packets. Sending |
| 269 | * zero-sized Data(Ack)s is theoretically possible, but for congestion |
| 270 | * control this case is pathological - ignore it. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 271 | */ |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 272 | if (unlikely(len == 0)) |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 273 | return -EBADMSG; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 274 | |
| 275 | /* See if last packet allocated was not sent */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 276 | new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
| 277 | if (new_packet == NULL || new_packet->dccphtx_sent) { |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 278 | new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, |
| 279 | SLAB_ATOMIC); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 280 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 281 | if (unlikely(new_packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 282 | DCCP_WARN("%s, sk=%p, not enough mem to add to history," |
| 283 | "send refused\n", dccp_role(sk), sk); |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 284 | return -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 285 | } |
| 286 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 287 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 288 | } |
| 289 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 290 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 291 | |
| 292 | switch (hctx->ccid3hctx_state) { |
| 293 | case TFRC_SSTATE_NO_SENT: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 294 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
| 295 | jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 296 | hctx->ccid3hctx_last_win_count = 0; |
| 297 | hctx->ccid3hctx_t_last_win_count = now; |
| 298 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 299 | |
Gerrit Renker | 90feeb9 | 2006-11-27 12:13:38 -0200 | [diff] [blame] | 300 | /* First timeout, according to [RFC 3448, 4.2], is 1 second */ |
| 301 | hctx->ccid3hctx_t_ipi = USEC_PER_SEC; |
| 302 | /* Initial delta: minimum of 0.5 sec and t_gran/2 */ |
| 303 | hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN; |
| 304 | |
| 305 | /* Set t_0 for initial packet */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 306 | hctx->ccid3hctx_t_nom = now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 307 | break; |
| 308 | case TFRC_SSTATE_NO_FBACK: |
| 309 | case TFRC_SSTATE_FBACK: |
Gerrit Renker | 91cf5a1 | 2006-11-27 12:25:10 -0200 | [diff] [blame] | 310 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
| 311 | /* |
| 312 | * Scheduling of packet transmissions [RFC 3448, 4.6] |
| 313 | * |
| 314 | * if (t_now > t_nom - delta) |
| 315 | * // send the packet now |
| 316 | * else |
| 317 | * // send the packet in (t_nom - t_now) milliseconds. |
| 318 | */ |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 319 | if (delay >= hctx->ccid3hctx_delta) |
| 320 | return delay / 1000L; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 321 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 322 | case TFRC_SSTATE_TERM: |
| 323 | DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk); |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 324 | return -EINVAL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 325 | } |
| 326 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 327 | /* prepare to send now (add options etc.) */ |
| 328 | dp->dccps_hc_tx_insert_options = 1; |
| 329 | new_packet->dccphtx_ccval = DCCP_SKB_CB(skb)->dccpd_ccval = |
| 330 | hctx->ccid3hctx_last_win_count; |
| 331 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
| 332 | |
| 333 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 334 | } |
| 335 | |
| 336 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) |
| 337 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 338 | const struct dccp_sock *dp = dccp_sk(sk); |
| 339 | 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] | 340 | struct timeval now; |
| 341 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 342 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 343 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 344 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 345 | |
| 346 | /* check if we have sent a data packet */ |
| 347 | if (len > 0) { |
| 348 | unsigned long quarter_rtt; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 349 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 350 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 351 | packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 352 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 353 | DCCP_WARN("packet doesn't exist in history!\n"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 354 | return; |
| 355 | } |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 356 | if (unlikely(packet->dccphtx_sent)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 357 | DCCP_WARN("no unsent packet in history!\n"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 358 | return; |
| 359 | } |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 360 | packet->dccphtx_tstamp = now; |
| 361 | packet->dccphtx_seqno = dp->dccps_gss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 362 | /* |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 363 | * Check if win_count have changed |
Gerrit Renker | 0e64e94 | 2006-10-24 16:17:51 -0700 | [diff] [blame] | 364 | * Algorithm in "8.1. Window Counter Value" in RFC 4342. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 365 | */ |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 366 | quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); |
| 367 | if (likely(hctx->ccid3hctx_rtt > 8)) |
| 368 | quarter_rtt /= hctx->ccid3hctx_rtt / 4; |
| 369 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 370 | if (quarter_rtt > 0) { |
| 371 | hctx->ccid3hctx_t_last_win_count = now; |
| 372 | hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + |
| 373 | min_t(unsigned long, quarter_rtt, 5)) % 16; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 374 | ccid3_pr_debug("%s, sk=%p, window changed from " |
| 375 | "%u to %u!\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 376 | dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 377 | packet->dccphtx_ccval, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 378 | hctx->ccid3hctx_last_win_count); |
| 379 | } |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 380 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 381 | hctx->ccid3hctx_idle = 0; |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 382 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 383 | packet->dccphtx_sent = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 384 | } else |
| 385 | ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", |
| 386 | dccp_role(sk), sk, dp->dccps_gss); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 390 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 391 | const struct dccp_sock *dp = dccp_sk(sk); |
| 392 | 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] | 393 | struct ccid3_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 394 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 395 | struct timeval now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 396 | unsigned long next_tmout; |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 397 | u32 t_elapsed; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 398 | u32 pinv; |
| 399 | u32 x_recv; |
| 400 | u32 r_sample; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 401 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 402 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 403 | |
| 404 | /* we are only interested in ACKs */ |
| 405 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || |
| 406 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) |
| 407 | return; |
| 408 | |
| 409 | opt_recv = &hctx->ccid3hctx_options_received; |
| 410 | |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 411 | t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 412 | x_recv = opt_recv->ccid3or_receive_rate; |
| 413 | pinv = opt_recv->ccid3or_loss_event_rate; |
| 414 | |
| 415 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 416 | case TFRC_SSTATE_NO_FBACK: |
| 417 | case TFRC_SSTATE_FBACK: |
| 418 | /* Calculate new round trip sample by |
| 419 | * R_sample = (now - t_recvdata) - t_delay */ |
| 420 | /* get t_recvdata from history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 421 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
| 422 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 423 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 424 | DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist " |
| 425 | "in history!\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 426 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 427 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 428 | return; |
| 429 | } |
| 430 | |
| 431 | /* Update RTT */ |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 432 | dccp_timestamp(sk, &now); |
| 433 | r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 434 | if (unlikely(r_sample <= t_elapsed)) |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 435 | DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n", |
| 436 | r_sample, t_elapsed); |
Arnaldo Carvalho de Melo | 1a28599 | 2005-09-09 02:32:56 -0300 | [diff] [blame] | 437 | else |
| 438 | r_sample -= t_elapsed; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 439 | |
| 440 | /* Update RTT estimate by |
| 441 | * If (No feedback recv) |
| 442 | * R = R_sample; |
| 443 | * Else |
| 444 | * R = q * R + (1 - q) * R_sample; |
| 445 | * |
| 446 | * q is a constant, RFC 3448 recomments 0.9 |
| 447 | */ |
| 448 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { |
| 449 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
| 450 | hctx->ccid3hctx_rtt = r_sample; |
| 451 | } else |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 452 | hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + |
| 453 | r_sample / 10; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 454 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 455 | ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " |
| 456 | "r_sample=%us\n", dccp_role(sk), sk, |
| 457 | hctx->ccid3hctx_rtt, r_sample); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 458 | |
| 459 | /* Update timeout interval */ |
Arnaldo Carvalho de Melo | c68e64c | 2005-08-21 05:07:37 -0300 | [diff] [blame] | 460 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
| 461 | USEC_PER_SEC); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 462 | |
| 463 | /* Update receive rate */ |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 464 | 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] | 465 | |
| 466 | /* Update loss event rate */ |
| 467 | if (pinv == ~0 || pinv == 0) |
| 468 | hctx->ccid3hctx_p = 0; |
| 469 | else { |
| 470 | hctx->ccid3hctx_p = 1000000 / pinv; |
| 471 | |
| 472 | if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { |
| 473 | hctx->ccid3hctx_p = TFRC_SMALLEST_P; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 474 | ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", |
| 475 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 476 | } |
| 477 | } |
| 478 | |
| 479 | /* unschedule no feedback timer */ |
| 480 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 481 | |
| 482 | /* Update sending rate */ |
| 483 | ccid3_hc_tx_update_x(sk); |
| 484 | |
| 485 | /* Update next send time */ |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 486 | timeval_sub_usecs(&hctx->ccid3hctx_t_nom, |
| 487 | hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 488 | ccid3_calc_new_t_ipi(hctx); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 489 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, |
| 490 | hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 491 | ccid3_calc_new_delta(hctx); |
| 492 | |
| 493 | /* remove all packets older than the one acked from history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 494 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
| 495 | &hctx->ccid3hctx_hist, packet); |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 496 | /* |
| 497 | * As we have calculated new ipi, delta, t_nom it is possible that |
| 498 | * we now can send a packet, so wake up dccp_wait_for_ccids. |
| 499 | */ |
| 500 | sk->sk_write_space(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 501 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 502 | /* |
| 503 | * Schedule no feedback timer to expire in |
| 504 | * max(4 * R, 2 * s / X) |
| 505 | */ |
Arnaldo Carvalho de Melo | c68e64c | 2005-08-21 05:07:37 -0300 | [diff] [blame] | 506 | next_tmout = max(hctx->ccid3hctx_t_rto, |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 507 | 2 * usecs_div(hctx->ccid3hctx_s, |
| 508 | hctx->ccid3hctx_x)); |
| 509 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 510 | ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " |
| 511 | "expire in %lu jiffies (%luus)\n", |
| 512 | dccp_role(sk), sk, |
| 513 | usecs_to_jiffies(next_tmout), next_tmout); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 514 | |
| 515 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 516 | jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 517 | |
| 518 | /* set idle flag */ |
| 519 | hctx->ccid3hctx_idle = 1; |
| 520 | break; |
Gerrit Renker | 5e19e3f | 2006-11-27 12:28:48 -0200 | [diff] [blame] | 521 | case TFRC_SSTATE_NO_SENT: |
| 522 | DCCP_WARN("Illegal ACK received - no packet has been sent\n"); |
| 523 | /* fall through */ |
| 524 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 525 | break; |
| 526 | } |
| 527 | } |
| 528 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 529 | 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] | 530 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 531 | 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] | 532 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 533 | BUG_ON(hctx == NULL); |
| 534 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 535 | if (sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN) |
| 536 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; |
| 537 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | 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] | 541 | unsigned char len, u16 idx, |
| 542 | unsigned char *value) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 543 | { |
| 544 | int rc = 0; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 545 | const struct dccp_sock *dp = dccp_sk(sk); |
| 546 | 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] | 547 | struct ccid3_options_received *opt_recv; |
| 548 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 549 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 550 | |
| 551 | opt_recv = &hctx->ccid3hctx_options_received; |
| 552 | |
| 553 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { |
| 554 | opt_recv->ccid3or_seqno = dp->dccps_gsr; |
| 555 | opt_recv->ccid3or_loss_event_rate = ~0; |
| 556 | opt_recv->ccid3or_loss_intervals_idx = 0; |
| 557 | opt_recv->ccid3or_loss_intervals_len = 0; |
| 558 | opt_recv->ccid3or_receive_rate = 0; |
| 559 | } |
| 560 | |
| 561 | switch (option) { |
| 562 | case TFRC_OPT_LOSS_EVENT_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 563 | if (unlikely(len != 4)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 564 | DCCP_WARN("%s, sk=%p, invalid len %d " |
| 565 | "for TFRC_OPT_LOSS_EVENT_RATE\n", |
| 566 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 567 | rc = -EINVAL; |
| 568 | } else { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 569 | opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 570 | ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", |
| 571 | dccp_role(sk), sk, |
| 572 | opt_recv->ccid3or_loss_event_rate); |
| 573 | } |
| 574 | break; |
| 575 | case TFRC_OPT_LOSS_INTERVALS: |
| 576 | opt_recv->ccid3or_loss_intervals_idx = idx; |
| 577 | opt_recv->ccid3or_loss_intervals_len = len; |
| 578 | ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", |
| 579 | dccp_role(sk), sk, |
| 580 | opt_recv->ccid3or_loss_intervals_idx, |
| 581 | opt_recv->ccid3or_loss_intervals_len); |
| 582 | break; |
| 583 | case TFRC_OPT_RECEIVE_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 584 | if (unlikely(len != 4)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 585 | DCCP_WARN("%s, sk=%p, invalid len %d " |
| 586 | "for TFRC_OPT_RECEIVE_RATE\n", |
| 587 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 588 | rc = -EINVAL; |
| 589 | } else { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 590 | opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 591 | ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", |
| 592 | dccp_role(sk), sk, |
| 593 | opt_recv->ccid3or_receive_rate); |
| 594 | } |
| 595 | break; |
| 596 | } |
| 597 | |
| 598 | return rc; |
| 599 | } |
| 600 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 601 | 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] | 602 | { |
| 603 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 604 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 605 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 606 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
| 607 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) |
| 608 | hctx->ccid3hctx_s = dp->dccps_packet_size; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 609 | else |
| 610 | hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; |
| 611 | |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 612 | /* Set transmission rate to 1 packet per second */ |
| 613 | hctx->ccid3hctx_x = hctx->ccid3hctx_s; |
Arnaldo Carvalho de Melo | c68e64c | 2005-08-21 05:07:37 -0300 | [diff] [blame] | 614 | hctx->ccid3hctx_t_rto = USEC_PER_SEC; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 615 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
| 616 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | aa5d7df | 2006-03-20 17:35:13 -0800 | [diff] [blame] | 617 | |
| 618 | hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; |
| 619 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 620 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
| 621 | |
| 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | static void ccid3_hc_tx_exit(struct sock *sk) |
| 626 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 627 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 628 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 629 | BUG_ON(hctx == NULL); |
| 630 | |
| 631 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); |
| 632 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 633 | |
| 634 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 635 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 636 | } |
| 637 | |
| 638 | /* |
| 639 | * RX Half Connection methods |
| 640 | */ |
| 641 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 642 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 643 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
| 644 | { |
| 645 | static char *ccid3_rx_state_names[] = { |
| 646 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", |
| 647 | [TFRC_RSTATE_DATA] = "DATA", |
| 648 | [TFRC_RSTATE_TERM] = "TERM", |
| 649 | }; |
| 650 | |
| 651 | return ccid3_rx_state_names[state]; |
| 652 | } |
| 653 | #endif |
| 654 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 655 | static void ccid3_hc_rx_set_state(struct sock *sk, |
| 656 | enum ccid3_hc_rx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 657 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 658 | 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] | 659 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
| 660 | |
| 661 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 662 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
| 663 | ccid3_rx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 664 | WARN_ON(state == oldstate); |
| 665 | hcrx->ccid3hcrx_state = state; |
| 666 | } |
| 667 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 668 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
| 669 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 670 | 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] | 671 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 672 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 673 | struct timeval now; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 674 | |
| 675 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); |
| 676 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 677 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 678 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 679 | switch (hcrx->ccid3hcrx_state) { |
| 680 | case TFRC_RSTATE_NO_DATA: |
| 681 | hcrx->ccid3hcrx_x_recv = 0; |
| 682 | break; |
| 683 | case TFRC_RSTATE_DATA: { |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 684 | const u32 delta = timeval_delta(&now, |
| 685 | &hcrx->ccid3hcrx_tstamp_last_feedback); |
Arnaldo Carvalho de Melo | 27ae543e | 2005-09-09 02:31:07 -0300 | [diff] [blame] | 686 | hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, |
| 687 | delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 688 | } |
| 689 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 690 | case TFRC_RSTATE_TERM: |
| 691 | 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] | 692 | return; |
| 693 | } |
| 694 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 695 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 696 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 697 | DCCP_WARN("%s, sk=%p, no data packet in history!\n", |
| 698 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 699 | return; |
| 700 | } |
| 701 | |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 702 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 703 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 704 | hcrx->ccid3hcrx_bytes_recv = 0; |
| 705 | |
| 706 | /* Convert to multiples of 10us */ |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 707 | hcrx->ccid3hcrx_elapsed_time = |
| 708 | timeval_delta(&now, &packet->dccphrx_tstamp) / 10; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 709 | if (hcrx->ccid3hcrx_p == 0) |
| 710 | hcrx->ccid3hcrx_pinv = ~0; |
| 711 | else |
| 712 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 713 | dp->dccps_hc_rx_insert_options = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 714 | dccp_send_ack(sk); |
| 715 | } |
| 716 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 717 | 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] | 718 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 719 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 720 | __be32 x_recv, pinv; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 721 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 722 | BUG_ON(hcrx == NULL); |
| 723 | |
| 724 | 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] | 725 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 726 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 727 | 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] | 728 | |
| 729 | if (dccp_packet_without_ack(skb)) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 730 | return 0; |
| 731 | |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 732 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
| 733 | pinv = htonl(hcrx->ccid3hcrx_pinv); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 734 | |
| 735 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && |
| 736 | dccp_insert_option_elapsed_time(sk, skb, |
| 737 | hcrx->ccid3hcrx_elapsed_time)) || |
| 738 | dccp_insert_option_timestamp(sk, skb) || |
| 739 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, |
| 740 | &pinv, sizeof(pinv)) || |
| 741 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, |
| 742 | &x_recv, sizeof(x_recv))) |
| 743 | return -1; |
| 744 | |
| 745 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 746 | } |
| 747 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 748 | /* calculate first loss interval |
| 749 | * |
| 750 | * returns estimated loss interval in usecs */ |
| 751 | |
| 752 | static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) |
| 753 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 754 | 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] | 755 | struct dccp_rx_hist_entry *entry, *next, *tail = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 756 | u32 rtt, delta, x_recv, fval, p, tmp2; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 757 | struct timeval tstamp = { 0, }; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 758 | int interval = 0; |
| 759 | int win_count = 0; |
| 760 | int step = 0; |
| 761 | u64 tmp1; |
| 762 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 763 | list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, |
| 764 | dccphrx_node) { |
| 765 | if (dccp_rx_hist_entry_data_packet(entry)) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 766 | tail = entry; |
| 767 | |
| 768 | switch (step) { |
| 769 | case 0: |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 770 | tstamp = entry->dccphrx_tstamp; |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 771 | win_count = entry->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 772 | step = 1; |
| 773 | break; |
| 774 | case 1: |
Arnaldo Carvalho de Melo | c173437 | 2005-08-13 20:34:23 -0300 | [diff] [blame] | 775 | interval = win_count - entry->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 776 | if (interval < 0) |
| 777 | interval += TFRC_WIN_COUNT_LIMIT; |
| 778 | if (interval > 4) |
| 779 | goto found; |
| 780 | break; |
| 781 | } |
| 782 | } |
| 783 | } |
| 784 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 785 | if (unlikely(step == 0)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 786 | DCCP_WARN("%s, sk=%p, packet history has no data packets!\n", |
| 787 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 788 | return ~0; |
| 789 | } |
| 790 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 791 | if (unlikely(interval == 0)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 792 | DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0." |
| 793 | "Defaulting to 1\n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 794 | interval = 1; |
| 795 | } |
| 796 | found: |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 797 | if (!tail) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 798 | DCCP_CRIT("tail is null\n"); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 799 | return ~0; |
| 800 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 801 | rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 802 | ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", |
| 803 | dccp_role(sk), sk, rtt); |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 804 | |
| 805 | if (rtt == 0) { |
| 806 | DCCP_WARN("RTT==0, setting to 1\n"); |
| 807 | rtt = 1; |
| 808 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 809 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 810 | dccp_timestamp(sk, &tstamp); |
| 811 | delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); |
| 812 | x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 813 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 814 | if (x_recv == 0) |
| 815 | x_recv = hcrx->ccid3hcrx_x_recv; |
| 816 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 817 | tmp1 = (u64)x_recv * (u64)rtt; |
| 818 | do_div(tmp1,10000000); |
| 819 | tmp2 = (u32)tmp1; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 820 | |
| 821 | if (!tmp2) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 822 | 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] | 823 | return ~0; |
| 824 | } |
| 825 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 826 | fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; |
| 827 | /* 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] | 828 | p = tfrc_calc_x_reverse_lookup(fval); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 829 | ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " |
| 830 | "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] | 831 | |
| 832 | if (p == 0) |
| 833 | return ~0; |
| 834 | else |
| 835 | return 1000000 / p; |
| 836 | } |
| 837 | |
| 838 | static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) |
| 839 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 840 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 841 | struct dccp_li_hist_entry *head; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 842 | u64 seq_temp; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 843 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 844 | if (list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 845 | if (!dccp_li_hist_interval_new(ccid3_li_hist, |
| 846 | &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss)) |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 847 | return; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 848 | |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 849 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
| 850 | struct dccp_li_hist_entry, dccplih_node); |
| 851 | head->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 852 | } else { |
| 853 | struct dccp_li_hist_entry *entry; |
| 854 | struct list_head *tail; |
| 855 | |
Ian McDonald | fc747e8 | 2006-08-29 17:50:19 -0700 | [diff] [blame] | 856 | head = list_entry(hcrx->ccid3hcrx_li_hist.next, |
| 857 | struct dccp_li_hist_entry, dccplih_node); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 858 | /* FIXME win count check removed as was wrong */ |
| 859 | /* should make this check with receive history */ |
| 860 | /* and compare there as per section 10.2 of RFC4342 */ |
| 861 | |
| 862 | /* new loss event detected */ |
| 863 | /* calculate last interval length */ |
| 864 | seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss); |
| 865 | entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); |
| 866 | |
| 867 | if (entry == NULL) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 868 | DCCP_BUG("out of memory - can not allocate entry"); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 869 | return; |
| 870 | } |
| 871 | |
| 872 | list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist); |
| 873 | |
| 874 | tail = hcrx->ccid3hcrx_li_hist.prev; |
| 875 | list_del(tail); |
| 876 | kmem_cache_free(ccid3_li_hist->dccplih_slab, tail); |
| 877 | |
| 878 | /* Create the newest interval */ |
| 879 | entry->dccplih_seqno = seq_loss; |
| 880 | entry->dccplih_interval = seq_temp; |
| 881 | entry->dccplih_win_count = win_loss; |
| 882 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 883 | } |
| 884 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 885 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
| 886 | struct dccp_rx_hist_entry *packet) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 887 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 888 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 889 | struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
| 890 | u64 seqno = packet->dccphrx_seqno; |
| 891 | u64 tmp_seqno; |
| 892 | int loss = 0; |
| 893 | u8 ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 894 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 895 | |
| 896 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 897 | |
| 898 | if (!rx_hist || |
| 899 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 900 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 901 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 902 | goto detect_out; |
| 903 | } |
| 904 | |
| 905 | |
| 906 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
| 907 | > TFRC_RECV_NUM_LATE_LOSS) { |
| 908 | loss = 1; |
| 909 | ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss, |
| 910 | hcrx->ccid3hcrx_ccval_nonloss); |
| 911 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 912 | dccp_inc_seqno(&tmp_seqno); |
| 913 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 914 | dccp_inc_seqno(&tmp_seqno); |
| 915 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, |
| 916 | tmp_seqno, &ccval)) { |
| 917 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 918 | hcrx->ccid3hcrx_ccval_nonloss = ccval; |
| 919 | dccp_inc_seqno(&tmp_seqno); |
| 920 | } |
| 921 | } |
| 922 | |
| 923 | /* FIXME - this code could be simplified with above while */ |
| 924 | /* but works at moment */ |
| 925 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 926 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 927 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 928 | } |
| 929 | |
| 930 | detect_out: |
| 931 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, |
| 932 | &hcrx->ccid3hcrx_li_hist, packet, |
| 933 | hcrx->ccid3hcrx_seqno_nonloss); |
| 934 | return loss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 935 | } |
| 936 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 937 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 938 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 939 | 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] | 940 | const struct dccp_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 941 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 942 | struct timeval now; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 943 | u32 p_prev, rtt_prev, r_sample, t_elapsed; |
| 944 | int loss; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 945 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 946 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 947 | |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 948 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 949 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 950 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
| 951 | case DCCP_PKT_ACK: |
| 952 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 953 | return; |
| 954 | case DCCP_PKT_DATAACK: |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 955 | if (opt_recv->dccpor_timestamp_echo == 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 956 | break; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 957 | rtt_prev = hcrx->ccid3hcrx_rtt; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 958 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 959 | timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); |
| 960 | r_sample = timeval_usecs(&now); |
| 961 | t_elapsed = opt_recv->dccpor_elapsed_time * 10; |
| 962 | |
| 963 | if (unlikely(r_sample <= t_elapsed)) |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 964 | DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n", |
| 965 | r_sample, t_elapsed); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 966 | else |
| 967 | r_sample -= t_elapsed; |
| 968 | |
| 969 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 970 | hcrx->ccid3hcrx_rtt = r_sample; |
| 971 | else |
| 972 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + |
| 973 | r_sample / 10; |
| 974 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 975 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
| 976 | 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] | 977 | dccp_role(sk), hcrx->ccid3hcrx_rtt, |
| 978 | opt_recv->dccpor_elapsed_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 979 | break; |
| 980 | case DCCP_PKT_DATA: |
| 981 | break; |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 982 | 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] | 983 | return; |
| 984 | } |
| 985 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 986 | 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] | 987 | skb, SLAB_ATOMIC); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 988 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 989 | DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet " |
| 990 | "to history, consider it lost!\n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 991 | return; |
| 992 | } |
| 993 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 994 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 995 | |
| 996 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) |
| 997 | return; |
| 998 | |
| 999 | switch (hcrx->ccid3hcrx_state) { |
| 1000 | case TFRC_RSTATE_NO_DATA: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1001 | ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " |
| 1002 | "feedback\n", |
| 1003 | dccp_role(sk), sk, |
| 1004 | dccp_state_name(sk->sk_state), skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1005 | ccid3_hc_rx_send_feedback(sk); |
| 1006 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); |
| 1007 | return; |
| 1008 | case TFRC_RSTATE_DATA: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1009 | hcrx->ccid3hcrx_bytes_recv += skb->len - |
| 1010 | dccp_hdr(skb)->dccph_doff * 4; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 1011 | if (loss) |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1012 | break; |
| 1013 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1014 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1015 | if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= |
| 1016 | hcrx->ccid3hcrx_rtt) { |
| 1017 | hcrx->ccid3hcrx_tstamp_last_ack = now; |
| 1018 | ccid3_hc_rx_send_feedback(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1019 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 1020 | return; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1021 | case TFRC_RSTATE_TERM: |
| 1022 | 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] | 1023 | return; |
| 1024 | } |
| 1025 | |
| 1026 | /* Dealing with packet loss */ |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 1027 | ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", |
| 1028 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1029 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1030 | p_prev = hcrx->ccid3hcrx_p; |
| 1031 | |
| 1032 | /* Calculate loss event rate */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1033 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 1034 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); |
| 1035 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1036 | /* Scaling up by 1000000 as fixed decimal */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 1037 | if (i_mean != 0) |
| 1038 | hcrx->ccid3hcrx_p = 1000000 / i_mean; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1039 | } else |
| 1040 | DCCP_BUG("empty loss history"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1041 | |
| 1042 | if (hcrx->ccid3hcrx_p > p_prev) { |
| 1043 | ccid3_hc_rx_send_feedback(sk); |
| 1044 | return; |
| 1045 | } |
| 1046 | } |
| 1047 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1048 | 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] | 1049 | { |
| 1050 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1051 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1052 | |
| 1053 | ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); |
| 1054 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 1055 | if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && |
| 1056 | dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) |
| 1057 | hcrx->ccid3hcrx_s = dp->dccps_packet_size; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1058 | else |
| 1059 | hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; |
| 1060 | |
| 1061 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
| 1062 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1063 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 1064 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
Arnaldo Carvalho de Melo | 954ee31 | 2005-09-09 02:37:05 -0300 | [diff] [blame] | 1065 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
| 1066 | hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1067 | return 0; |
| 1068 | } |
| 1069 | |
| 1070 | static void ccid3_hc_rx_exit(struct sock *sk) |
| 1071 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1072 | 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] | 1073 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1074 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1075 | |
| 1076 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); |
| 1077 | |
| 1078 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1079 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1080 | |
| 1081 | /* Empty loss interval history */ |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1082 | 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] | 1083 | } |
| 1084 | |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1085 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
| 1086 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1087 | 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] | 1088 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1089 | /* Listen socks doesn't have a private CCID block */ |
| 1090 | if (sk->sk_state == DCCP_LISTEN) |
| 1091 | return; |
| 1092 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1093 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1094 | |
| 1095 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; |
| 1096 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; |
| 1097 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; |
| 1098 | } |
| 1099 | |
| 1100 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) |
| 1101 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1102 | 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] | 1103 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1104 | /* Listen socks doesn't have a private CCID block */ |
| 1105 | if (sk->sk_state == DCCP_LISTEN) |
| 1106 | return; |
| 1107 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1108 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1109 | |
| 1110 | info->tcpi_rto = hctx->ccid3hctx_t_rto; |
| 1111 | info->tcpi_rtt = hctx->ccid3hctx_rtt; |
| 1112 | } |
| 1113 | |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1114 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
| 1115 | u32 __user *optval, int __user *optlen) |
| 1116 | { |
| 1117 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
| 1118 | const void *val; |
| 1119 | |
| 1120 | /* Listen socks doesn't have a private CCID block */ |
| 1121 | if (sk->sk_state == DCCP_LISTEN) |
| 1122 | return -EINVAL; |
| 1123 | |
| 1124 | switch (optname) { |
| 1125 | case DCCP_SOCKOPT_CCID_RX_INFO: |
| 1126 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) |
| 1127 | return -EINVAL; |
| 1128 | len = sizeof(hcrx->ccid3hcrx_tfrc); |
| 1129 | val = &hcrx->ccid3hcrx_tfrc; |
| 1130 | break; |
| 1131 | default: |
| 1132 | return -ENOPROTOOPT; |
| 1133 | } |
| 1134 | |
| 1135 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1136 | return -EFAULT; |
| 1137 | |
| 1138 | return 0; |
| 1139 | } |
| 1140 | |
| 1141 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, |
| 1142 | u32 __user *optval, int __user *optlen) |
| 1143 | { |
| 1144 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
| 1145 | const void *val; |
| 1146 | |
| 1147 | /* Listen socks doesn't have a private CCID block */ |
| 1148 | if (sk->sk_state == DCCP_LISTEN) |
| 1149 | return -EINVAL; |
| 1150 | |
| 1151 | switch (optname) { |
| 1152 | case DCCP_SOCKOPT_CCID_TX_INFO: |
| 1153 | if (len < sizeof(hctx->ccid3hctx_tfrc)) |
| 1154 | return -EINVAL; |
| 1155 | len = sizeof(hctx->ccid3hctx_tfrc); |
| 1156 | val = &hctx->ccid3hctx_tfrc; |
| 1157 | break; |
| 1158 | default: |
| 1159 | return -ENOPROTOOPT; |
| 1160 | } |
| 1161 | |
| 1162 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1163 | return -EFAULT; |
| 1164 | |
| 1165 | return 0; |
| 1166 | } |
| 1167 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1168 | static struct ccid_operations ccid3 = { |
Ian McDonald | 3dd9a7c | 2006-09-22 14:26:44 +1200 | [diff] [blame] | 1169 | .ccid_id = DCCPC_CCID3, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1170 | .ccid_name = "ccid3", |
| 1171 | .ccid_owner = THIS_MODULE, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1172 | .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] | 1173 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
| 1174 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, |
| 1175 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, |
| 1176 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, |
| 1177 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, |
| 1178 | .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, |
| 1179 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1180 | .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] | 1181 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
| 1182 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, |
| 1183 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, |
| 1184 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1185 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
| 1186 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1187 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
| 1188 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1189 | }; |
| 1190 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1191 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1192 | module_param(ccid3_debug, int, 0444); |
| 1193 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1194 | #endif |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1195 | |
| 1196 | static __init int ccid3_module_init(void) |
| 1197 | { |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1198 | int rc = -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1199 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1200 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
| 1201 | if (ccid3_rx_hist == NULL) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1202 | goto out; |
| 1203 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1204 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
| 1205 | if (ccid3_tx_hist == NULL) |
| 1206 | goto out_free_rx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1207 | |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1208 | ccid3_li_hist = dccp_li_hist_new("ccid3"); |
| 1209 | if (ccid3_li_hist == NULL) |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1210 | goto out_free_tx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1211 | |
| 1212 | rc = ccid_register(&ccid3); |
| 1213 | if (rc != 0) |
| 1214 | goto out_free_loss_interval_history; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1215 | out: |
| 1216 | return rc; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1217 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1218 | out_free_loss_interval_history: |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1219 | dccp_li_hist_delete(ccid3_li_hist); |
| 1220 | ccid3_li_hist = NULL; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1221 | out_free_tx: |
| 1222 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1223 | ccid3_tx_hist = NULL; |
| 1224 | out_free_rx: |
| 1225 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1226 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1227 | goto out; |
| 1228 | } |
| 1229 | module_init(ccid3_module_init); |
| 1230 | |
| 1231 | static __exit void ccid3_module_exit(void) |
| 1232 | { |
| 1233 | ccid_unregister(&ccid3); |
| 1234 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1235 | if (ccid3_tx_hist != NULL) { |
| 1236 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1237 | ccid3_tx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1238 | } |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1239 | if (ccid3_rx_hist != NULL) { |
| 1240 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1241 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1242 | } |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 1243 | if (ccid3_li_hist != NULL) { |
| 1244 | dccp_li_hist_delete(ccid3_li_hist); |
| 1245 | ccid3_li_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1246 | } |
| 1247 | } |
| 1248 | module_exit(ccid3_module_exit); |
| 1249 | |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 1250 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1251 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1252 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
| 1253 | MODULE_LICENSE("GPL"); |
| 1254 | MODULE_ALIAS("net-dccp-ccid-3"); |