Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/dccp/ccids/ccid3.c |
| 3 | * |
Ian McDonald | b2f41ff | 2007-05-28 12:23:29 -0300 | [diff] [blame] | 4 | * Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand. |
| 5 | * Copyright (c) 2005-7 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 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 36 | #include "../ccid.h" |
| 37 | #include "../dccp.h" |
Arnaldo Carvalho de Melo | 4524b25 | 2005-08-27 23:18:26 -0300 | [diff] [blame] | 38 | #include "lib/packet_history.h" |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 39 | #include "lib/loss_interval.h" |
Arnaldo Carvalho de Melo | 36729c1 | 2005-08-28 00:47:15 -0300 | [diff] [blame] | 40 | #include "lib/tfrc.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 41 | #include "ccid3.h" |
| 42 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 43 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
| 44 | static int ccid3_debug; |
| 45 | #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] | 46 | #else |
| 47 | #define ccid3_pr_debug(format, a...) |
| 48 | #endif |
| 49 | |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 50 | static struct dccp_tx_hist *ccid3_tx_hist; |
| 51 | static struct dccp_rx_hist *ccid3_rx_hist; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 52 | |
Gerrit Renker | 9bf1747 | 2007-03-20 13:11:24 -0300 | [diff] [blame] | 53 | /* |
| 54 | * Transmitter Half-Connection Routines |
| 55 | */ |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 56 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 57 | static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) |
| 58 | { |
| 59 | static char *ccid3_state_names[] = { |
| 60 | [TFRC_SSTATE_NO_SENT] = "NO_SENT", |
| 61 | [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", |
| 62 | [TFRC_SSTATE_FBACK] = "FBACK", |
| 63 | [TFRC_SSTATE_TERM] = "TERM", |
| 64 | }; |
| 65 | |
| 66 | return ccid3_state_names[state]; |
| 67 | } |
| 68 | #endif |
| 69 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 70 | static void ccid3_hc_tx_set_state(struct sock *sk, |
| 71 | enum ccid3_hc_tx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 72 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 73 | 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] | 74 | enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; |
| 75 | |
| 76 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 77 | dccp_role(sk), sk, ccid3_tx_state_name(oldstate), |
| 78 | ccid3_tx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 79 | WARN_ON(state == oldstate); |
| 80 | hctx->ccid3hctx_state = state; |
| 81 | } |
| 82 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 83 | /* |
Gerrit Renker | a21f9f9 | 2007-03-20 15:12:10 -0300 | [diff] [blame] | 84 | * Compute the initial sending rate X_init according to RFC 3390: |
| 85 | * w_init = min(4 * MSS, max(2 * MSS, 4380 bytes)) |
| 86 | * X_init = w_init / RTT |
| 87 | * For consistency with other parts of the code, X_init is scaled by 2^6. |
| 88 | */ |
| 89 | static inline u64 rfc3390_initial_rate(struct sock *sk) |
| 90 | { |
| 91 | const struct dccp_sock *dp = dccp_sk(sk); |
| 92 | const __u32 w_init = min(4 * dp->dccps_mss_cache, |
| 93 | max(2 * dp->dccps_mss_cache, 4380U)); |
| 94 | |
| 95 | return scaled_div(w_init << 6, ccid3_hc_tx_sk(sk)->ccid3hctx_rtt); |
| 96 | } |
| 97 | |
| 98 | /* |
Gerrit Renker | 1266ade | 2007-03-20 14:56:11 -0300 | [diff] [blame] | 99 | * Recalculate t_ipi and delta (should be called whenever X changes) |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 100 | */ |
Gerrit Renker | 1266ade | 2007-03-20 14:56:11 -0300 | [diff] [blame] | 101 | static inline void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 102 | { |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 103 | /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */ |
Gerrit Renker | b2449fd | 2007-04-20 13:02:55 -0700 | [diff] [blame] | 104 | hctx->ccid3hctx_t_ipi = scaled_div32(((u64)hctx->ccid3hctx_s) << 6, |
| 105 | hctx->ccid3hctx_x); |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 106 | |
Gerrit Renker | 17893bc | 2006-11-27 20:31:33 -0200 | [diff] [blame] | 107 | /* 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] | 108 | hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, |
| 109 | TFRC_OPSYS_HALF_TIME_GRAN); |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 110 | |
Gerrit Renker | 1761f7d | 2007-03-20 15:04:30 -0300 | [diff] [blame] | 111 | ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 112 | hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta, |
Gerrit Renker | 1761f7d | 2007-03-20 15:04:30 -0300 | [diff] [blame] | 113 | hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6)); |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 114 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 115 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 116 | /* |
| 117 | * Update X by |
| 118 | * If (p > 0) |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 119 | * X_calc = calcX(s, R, p); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 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; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 125 | * |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 126 | * Note: X and X_recv are both stored in units of 64 * bytes/second, to support |
| 127 | * fine-grained resolution of sending rates. This requires scaling by 2^6 |
| 128 | * throughout the code. Only X_calc is unscaled (in bytes/second). |
| 129 | * |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 130 | */ |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 131 | static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now) |
| 132 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 133 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 134 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 135 | __u64 min_rate = 2 * hctx->ccid3hctx_x_recv; |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 136 | const __u64 old_x = hctx->ccid3hctx_x; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 137 | |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 138 | /* |
| 139 | * Handle IDLE periods: do not reduce below RFC3390 initial sending rate |
| 140 | * when idling [RFC 4342, 5.1]. See also draft-ietf-dccp-rfc3448bis. |
| 141 | * For consistency with X and X_recv, min_rate is also scaled by 2^6. |
| 142 | */ |
| 143 | if (unlikely(hctx->ccid3hctx_idle)) { |
| 144 | min_rate = rfc3390_initial_rate(sk); |
| 145 | min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv); |
| 146 | } |
| 147 | |
Gerrit Renker | 4415830 | 2006-12-03 14:53:07 -0200 | [diff] [blame] | 148 | if (hctx->ccid3hctx_p > 0) { |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 149 | |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 150 | hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6, |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 151 | min_rate); |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 152 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x, |
| 153 | (((__u64)hctx->ccid3hctx_s) << 6) / |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 154 | TFRC_T_MBI); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 155 | |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 156 | } else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) - |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 157 | (suseconds_t)hctx->ccid3hctx_rtt >= 0) { |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 158 | |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 159 | hctx->ccid3hctx_x = |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 160 | max(min(2 * hctx->ccid3hctx_x, min_rate), |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 161 | scaled_div(((__u64)hctx->ccid3hctx_s) << 6, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 162 | hctx->ccid3hctx_rtt)); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 163 | hctx->ccid3hctx_t_ld = *now; |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame] | 164 | } |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 165 | |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 166 | if (hctx->ccid3hctx_x != old_x) { |
Gerrit Renker | 1761f7d | 2007-03-20 15:04:30 -0300 | [diff] [blame] | 167 | ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, " |
| 168 | "X_recv=%u\n", (unsigned)(old_x >> 6), |
| 169 | (unsigned)(hctx->ccid3hctx_x >> 6), |
| 170 | hctx->ccid3hctx_x_calc, |
| 171 | (unsigned)(hctx->ccid3hctx_x_recv >> 6)); |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 172 | |
Gerrit Renker | 1266ade | 2007-03-20 14:56:11 -0300 | [diff] [blame] | 173 | ccid3_update_send_interval(hctx); |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 174 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 175 | } |
| 176 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 177 | /* |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 178 | * Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1) |
| 179 | * @len: DCCP packet payload size in bytes |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 180 | */ |
| 181 | static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len) |
| 182 | { |
Gerrit Renker | 1266ade | 2007-03-20 14:56:11 -0300 | [diff] [blame] | 183 | const u16 old_s = hctx->ccid3hctx_s; |
| 184 | |
| 185 | hctx->ccid3hctx_s = old_s == 0 ? len : (9 * old_s + len) / 10; |
| 186 | |
| 187 | if (hctx->ccid3hctx_s != old_s) |
| 188 | ccid3_update_send_interval(hctx); |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 189 | } |
| 190 | |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 191 | /* |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 192 | * Update Window Counter using the algorithm from [RFC 4342, 8.1]. |
| 193 | * The algorithm is not applicable if RTT < 4 microseconds. |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 194 | */ |
| 195 | static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx, |
| 196 | struct timeval *now) |
| 197 | { |
| 198 | suseconds_t delta; |
| 199 | u32 quarter_rtts; |
| 200 | |
| 201 | if (unlikely(hctx->ccid3hctx_rtt < 4)) /* avoid divide-by-zero */ |
| 202 | return; |
| 203 | |
| 204 | delta = timeval_delta(now, &hctx->ccid3hctx_t_last_win_count); |
| 205 | DCCP_BUG_ON(delta < 0); |
| 206 | |
| 207 | quarter_rtts = (u32)delta / (hctx->ccid3hctx_rtt / 4); |
| 208 | |
| 209 | if (quarter_rtts > 0) { |
| 210 | hctx->ccid3hctx_t_last_win_count = *now; |
| 211 | hctx->ccid3hctx_last_win_count += min_t(u32, quarter_rtts, 5); |
| 212 | hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */ |
| 213 | |
| 214 | ccid3_pr_debug("now at %#X\n", hctx->ccid3hctx_last_win_count); |
| 215 | } |
| 216 | } |
| 217 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 218 | static void ccid3_hc_tx_no_feedback_timer(unsigned long data) |
| 219 | { |
| 220 | struct sock *sk = (struct sock *)data; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 221 | struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 222 | struct timeval now; |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 223 | unsigned long t_nfb = USEC_PER_SEC / 5; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 224 | |
| 225 | bh_lock_sock(sk); |
| 226 | if (sock_owned_by_user(sk)) { |
| 227 | /* Try again later. */ |
| 228 | /* XXX: set some sensible MIB */ |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 229 | goto restart_timer; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 230 | } |
| 231 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 232 | ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 233 | ccid3_tx_state_name(hctx->ccid3hctx_state)); |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 234 | |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 235 | hctx->ccid3hctx_idle = 1; |
| 236 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 237 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 238 | case TFRC_SSTATE_NO_FBACK: |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 239 | /* RFC 3448, 4.4: Halve send rate directly */ |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 240 | hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2, |
| 241 | (((__u64)hctx->ccid3hctx_s) << 6) / |
| 242 | TFRC_T_MBI); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 243 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 244 | ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u " |
| 245 | "bytes/s\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 246 | ccid3_tx_state_name(hctx->ccid3hctx_state), |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 247 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 248 | /* The value of R is still undefined and so we can not recompute |
| 249 | * the timout value. Keep initial value as per [RFC 4342, 5]. */ |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 250 | t_nfb = TFRC_INITIAL_TIMEOUT; |
Gerrit Renker | 1266ade | 2007-03-20 14:56:11 -0300 | [diff] [blame] | 251 | ccid3_update_send_interval(hctx); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 252 | break; |
| 253 | case TFRC_SSTATE_FBACK: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 254 | /* |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 255 | * Modify the cached value of X_recv [RFC 3448, 4.4] |
| 256 | * |
| 257 | * If (p == 0 || X_calc > 2 * X_recv) |
| 258 | * X_recv = max(X_recv / 2, s / (2 * t_mbi)); |
| 259 | * Else |
| 260 | * X_recv = X_calc / 4; |
| 261 | * |
| 262 | * Note that X_recv is scaled by 2^6 while X_calc is not |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 263 | */ |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 264 | BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 265 | |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 266 | if (hctx->ccid3hctx_p == 0 || |
| 267 | (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 268 | |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 269 | hctx->ccid3hctx_x_recv = |
| 270 | max(hctx->ccid3hctx_x_recv / 2, |
| 271 | (((__u64)hctx->ccid3hctx_s) << 6) / |
| 272 | (2 * TFRC_T_MBI)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 273 | |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 274 | if (hctx->ccid3hctx_p == 0) |
| 275 | dccp_timestamp(sk, &now); |
| 276 | } else { |
| 277 | hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc; |
| 278 | hctx->ccid3hctx_x_recv <<= 4; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 279 | } |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 280 | /* Now recalculate X [RFC 3448, 4.3, step (4)] */ |
| 281 | ccid3_hc_tx_update_x(sk, &now); |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 282 | /* |
| 283 | * Schedule no feedback timer to expire in |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 284 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
| 285 | * See comments in packet_recv() regarding the value of t_RTO. |
Arnaldo Carvalho de Melo | 6b5e633 | 2005-08-27 20:11:28 -0300 | [diff] [blame] | 286 | */ |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 287 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 288 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 289 | case TFRC_SSTATE_NO_SENT: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 290 | DCCP_BUG("%s(%p) - Illegal state NO_SENT", dccp_role(sk), sk); |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 291 | /* fall through */ |
| 292 | case TFRC_SSTATE_TERM: |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 293 | goto out; |
| 294 | } |
| 295 | |
Gerrit Renker | 48e03ee | 2006-11-27 20:29:27 -0200 | [diff] [blame] | 296 | restart_timer: |
| 297 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 298 | jiffies + usecs_to_jiffies(t_nfb)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 299 | out: |
| 300 | bh_unlock_sock(sk); |
| 301 | sock_put(sk); |
| 302 | } |
| 303 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 304 | /* |
| 305 | * returns |
| 306 | * > 0: delay (in msecs) that should pass before actually sending |
| 307 | * = 0: can send immediately |
| 308 | * < 0: error condition; do not send packet |
| 309 | */ |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 310 | static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 311 | { |
| 312 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 313 | 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] | 314 | struct timeval now; |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 315 | suseconds_t delay; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 316 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 317 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 318 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 319 | /* |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 320 | * This function is called only for Data and DataAck packets. Sending |
| 321 | * zero-sized Data(Ack)s is theoretically possible, but for congestion |
| 322 | * control this case is pathological - ignore it. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 323 | */ |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 324 | if (unlikely(skb->len == 0)) |
Gerrit Renker | da335ba | 2006-11-27 12:26:57 -0200 | [diff] [blame] | 325 | return -EBADMSG; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 326 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 327 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 328 | |
| 329 | switch (hctx->ccid3hctx_state) { |
| 330 | case TFRC_SSTATE_NO_SENT: |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 331 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 332 | (jiffies + |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 333 | usecs_to_jiffies(TFRC_INITIAL_TIMEOUT))); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 334 | hctx->ccid3hctx_last_win_count = 0; |
| 335 | hctx->ccid3hctx_t_last_win_count = now; |
Gerrit Renker | 90feeb9 | 2006-11-27 12:13:38 -0200 | [diff] [blame] | 336 | |
| 337 | /* Set t_0 for initial packet */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 338 | hctx->ccid3hctx_t_nom = now; |
Gerrit Renker | 30833ff | 2007-03-20 15:31:56 -0300 | [diff] [blame] | 339 | |
| 340 | hctx->ccid3hctx_s = skb->len; |
| 341 | |
| 342 | /* |
| 343 | * Use initial RTT sample when available: recommended by erratum |
| 344 | * to RFC 4342. This implements the initialisation procedure of |
| 345 | * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6. |
| 346 | */ |
| 347 | if (dp->dccps_syn_rtt) { |
| 348 | ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt); |
| 349 | hctx->ccid3hctx_rtt = dp->dccps_syn_rtt; |
| 350 | hctx->ccid3hctx_x = rfc3390_initial_rate(sk); |
| 351 | hctx->ccid3hctx_t_ld = now; |
| 352 | } else { |
| 353 | /* Sender does not have RTT sample: X = MSS/second */ |
| 354 | hctx->ccid3hctx_x = dp->dccps_mss_cache; |
| 355 | hctx->ccid3hctx_x <<= 6; |
| 356 | } |
| 357 | ccid3_update_send_interval(hctx); |
| 358 | |
| 359 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 360 | break; |
| 361 | case TFRC_SSTATE_NO_FBACK: |
| 362 | case TFRC_SSTATE_FBACK: |
Gerrit Renker | 91cf5a1 | 2006-11-27 12:25:10 -0200 | [diff] [blame] | 363 | delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now); |
Ian McDonald | 8699be7 | 2007-03-20 14:49:20 -0300 | [diff] [blame] | 364 | ccid3_pr_debug("delay=%ld\n", (long)delay); |
Gerrit Renker | 91cf5a1 | 2006-11-27 12:25:10 -0200 | [diff] [blame] | 365 | /* |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 366 | * Scheduling of packet transmissions [RFC 3448, 4.6] |
Gerrit Renker | 91cf5a1 | 2006-11-27 12:25:10 -0200 | [diff] [blame] | 367 | * |
| 368 | * if (t_now > t_nom - delta) |
| 369 | * // send the packet now |
| 370 | * else |
| 371 | * // send the packet in (t_nom - t_now) milliseconds. |
| 372 | */ |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 373 | if (delay - (suseconds_t)hctx->ccid3hctx_delta >= 0) |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 374 | return delay / 1000L; |
Gerrit Renker | 9f8681d | 2006-12-10 00:07:37 -0200 | [diff] [blame] | 375 | |
| 376 | ccid3_hc_tx_update_win_count(hctx, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 377 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 378 | case TFRC_SSTATE_TERM: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 379 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 380 | return -EINVAL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 381 | } |
| 382 | |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 383 | /* prepare to send now (add options etc.) */ |
| 384 | dp->dccps_hc_tx_insert_options = 1; |
Gerrit Renker | e312d10 | 2006-12-10 00:08:09 -0200 | [diff] [blame] | 385 | DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; |
Gerrit Renker | 0c150ef | 2007-03-20 15:19:07 -0300 | [diff] [blame] | 386 | hctx->ccid3hctx_idle = 0; |
Gerrit Renker | e312d10 | 2006-12-10 00:08:09 -0200 | [diff] [blame] | 387 | |
| 388 | /* set the nominal send time for the next following packet */ |
Gerrit Renker | 7da7f45 | 2006-11-27 12:26:03 -0200 | [diff] [blame] | 389 | timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi); |
| 390 | |
| 391 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 392 | } |
| 393 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 394 | static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, |
| 395 | unsigned int len) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 396 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 397 | 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] | 398 | struct timeval now; |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 399 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 400 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 401 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 402 | |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 403 | ccid3_hc_tx_update_s(hctx, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 404 | |
Gerrit Renker | c5a1ae9 | 2006-12-10 00:09:21 -0200 | [diff] [blame] | 405 | packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 406 | if (unlikely(packet == NULL)) { |
Gerrit Renker | c5a1ae9 | 2006-12-10 00:09:21 -0200 | [diff] [blame] | 407 | DCCP_CRIT("packet history - out of memory!"); |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 408 | return; |
| 409 | } |
Gerrit Renker | c5a1ae9 | 2006-12-10 00:09:21 -0200 | [diff] [blame] | 410 | dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, packet); |
| 411 | |
| 412 | dccp_timestamp(sk, &now); |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 413 | packet->dccphtx_tstamp = now; |
Gerrit Renker | c5a1ae9 | 2006-12-10 00:09:21 -0200 | [diff] [blame] | 414 | packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss; |
| 415 | packet->dccphtx_rtt = hctx->ccid3hctx_rtt; |
| 416 | packet->dccphtx_sent = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 420 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 421 | 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] | 422 | struct ccid3_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 423 | struct dccp_tx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 424 | struct timeval now; |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 425 | unsigned long t_nfb; |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 426 | u32 pinv, r_sample; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 427 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 428 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 429 | |
| 430 | /* we are only interested in ACKs */ |
| 431 | if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || |
| 432 | DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) |
| 433 | return; |
| 434 | |
| 435 | opt_recv = &hctx->ccid3hctx_options_received; |
| 436 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 437 | switch (hctx->ccid3hctx_state) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 438 | case TFRC_SSTATE_NO_FBACK: |
| 439 | case TFRC_SSTATE_FBACK: |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 440 | /* get packet from history to look up t_recvdata */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 441 | packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 442 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 443 | if (unlikely(packet == NULL)) { |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 444 | DCCP_WARN("%s(%p), seqno %llu(%s) doesn't exist " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 445 | "in history!\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 446 | (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 447 | dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 448 | return; |
| 449 | } |
| 450 | |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 451 | /* Update receive rate in units of 64 * bytes/second */ |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 452 | hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate; |
| 453 | hctx->ccid3hctx_x_recv <<= 6; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 454 | |
| 455 | /* Update loss event rate */ |
| 456 | pinv = opt_recv->ccid3or_loss_event_rate; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 457 | if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */ |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 458 | hctx->ccid3hctx_p = 0; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 459 | else /* can not exceed 100% */ |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 460 | hctx->ccid3hctx_p = 1000000 / pinv; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 461 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 462 | dccp_timestamp(sk, &now); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 463 | |
| 464 | /* |
| 465 | * Calculate new round trip sample as per [RFC 3448, 4.3] by |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 466 | * R_sample = (now - t_recvdata) - t_elapsed |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 467 | */ |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 468 | r_sample = dccp_sample_rtt(sk, &now, &packet->dccphtx_tstamp); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 469 | |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 470 | /* |
| 471 | * Update RTT estimate by |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 472 | * If (No feedback recv) |
| 473 | * R = R_sample; |
| 474 | * Else |
| 475 | * R = q * R + (1 - q) * R_sample; |
| 476 | * |
| 477 | * q is a constant, RFC 3448 recomments 0.9 |
| 478 | */ |
| 479 | if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 480 | /* |
| 481 | * Larger Initial Windows [RFC 4342, sec. 5] |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 482 | */ |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 483 | hctx->ccid3hctx_rtt = r_sample; |
Gerrit Renker | a21f9f9 | 2007-03-20 15:12:10 -0300 | [diff] [blame] | 484 | hctx->ccid3hctx_x = rfc3390_initial_rate(sk); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 485 | hctx->ccid3hctx_t_ld = now; |
| 486 | |
Gerrit Renker | 1266ade | 2007-03-20 14:56:11 -0300 | [diff] [blame] | 487 | ccid3_update_send_interval(hctx); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 488 | |
Gerrit Renker | a21f9f9 | 2007-03-20 15:12:10 -0300 | [diff] [blame] | 489 | ccid3_pr_debug("%s(%p), s=%u, MSS=%u, " |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 490 | "R_sample=%uus, X=%u\n", dccp_role(sk), |
Andrew Morton | 0f08461 | 2007-02-05 18:18:21 -0800 | [diff] [blame] | 491 | sk, hctx->ccid3hctx_s, |
David S. Miller | 1b07a95 | 2007-05-23 17:43:11 -0700 | [diff] [blame] | 492 | dccp_sk(sk)->dccps_mss_cache, r_sample, |
Gerrit Renker | 1a21e49 | 2006-12-10 00:02:12 -0200 | [diff] [blame] | 493 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 494 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 495 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 496 | } else { |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 497 | hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt + |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 498 | r_sample) / 10; |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 499 | |
Gerrit Renker | ff58629 | 2006-12-10 00:00:14 -0200 | [diff] [blame] | 500 | /* Update sending rate (step 4 of [RFC 3448, 4.3]) */ |
| 501 | if (hctx->ccid3hctx_p > 0) |
| 502 | hctx->ccid3hctx_x_calc = |
| 503 | tfrc_calc_x(hctx->ccid3hctx_s, |
| 504 | hctx->ccid3hctx_rtt, |
| 505 | hctx->ccid3hctx_p); |
Gerrit Renker | a79ef76 | 2006-11-28 19:51:42 -0200 | [diff] [blame] | 506 | ccid3_hc_tx_update_x(sk, &now); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 507 | |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 508 | ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, " |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 509 | "p=%u, X_calc=%u, X_recv=%u, X=%u\n", |
| 510 | dccp_role(sk), |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 511 | sk, hctx->ccid3hctx_rtt, r_sample, |
Gerrit Renker | 5c3fbb6 | 2006-12-03 14:50:56 -0200 | [diff] [blame] | 512 | hctx->ccid3hctx_s, hctx->ccid3hctx_p, |
| 513 | hctx->ccid3hctx_x_calc, |
Gerrit Renker | 9e8efc8 | 2006-12-10 00:24:57 -0200 | [diff] [blame] | 514 | (unsigned)(hctx->ccid3hctx_x_recv >> 6), |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 515 | (unsigned)(hctx->ccid3hctx_x >> 6)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 516 | } |
| 517 | |
| 518 | /* unschedule no feedback timer */ |
| 519 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 520 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 521 | /* remove all packets older than the one acked from history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 522 | dccp_tx_hist_purge_older(ccid3_tx_hist, |
| 523 | &hctx->ccid3hctx_hist, packet); |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 524 | /* |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 525 | * As we have calculated new ipi, delta, t_nom it is possible |
| 526 | * that we now can send a packet, so wake up dccp_wait_for_ccid |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 527 | */ |
| 528 | sk->sk_write_space(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 529 | |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 530 | /* |
| 531 | * Update timeout interval for the nofeedback timer. |
| 532 | * We use a configuration option to increase the lower bound. |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 533 | * This can help avoid triggering the nofeedback timer too |
| 534 | * often ('spinning') on LANs with small RTTs. |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 535 | */ |
Gerrit Renker | 5d0dbc4 | 2006-11-27 20:32:37 -0200 | [diff] [blame] | 536 | hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 537 | CONFIG_IP_DCCP_CCID3_RTO * |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 538 | (USEC_PER_SEC/1000)); |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 539 | /* |
| 540 | * Schedule no feedback timer to expire in |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 541 | * max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi) |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 542 | */ |
Gerrit Renker | 8a508ac | 2006-12-03 14:50:23 -0200 | [diff] [blame] | 543 | t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 544 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 545 | ccid3_pr_debug("%s(%p), Scheduled no feedback timer to " |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 546 | "expire in %lu jiffies (%luus)\n", |
| 547 | dccp_role(sk), |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 548 | sk, usecs_to_jiffies(t_nfb), t_nfb); |
| 549 | |
| 550 | sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, |
Gerrit Renker | 2a1fda6 | 2006-11-28 18:34:34 -0200 | [diff] [blame] | 551 | jiffies + usecs_to_jiffies(t_nfb)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 552 | |
| 553 | /* set idle flag */ |
Gerrit Renker | bf58a38 | 2006-12-10 00:04:43 -0200 | [diff] [blame] | 554 | hctx->ccid3hctx_idle = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 555 | break; |
Gerrit Renker | 151a993 | 2007-03-07 12:53:48 -0800 | [diff] [blame] | 556 | case TFRC_SSTATE_NO_SENT: /* fall through */ |
Gerrit Renker | 5e19e3f | 2006-11-27 12:28:48 -0200 | [diff] [blame] | 557 | case TFRC_SSTATE_TERM: /* ignore feedback when closing */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 558 | break; |
| 559 | } |
| 560 | } |
| 561 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 562 | 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] | 563 | unsigned char len, u16 idx, |
| 564 | unsigned char *value) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 565 | { |
| 566 | int rc = 0; |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 567 | const struct dccp_sock *dp = dccp_sk(sk); |
| 568 | 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] | 569 | struct ccid3_options_received *opt_recv; |
| 570 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 571 | BUG_ON(hctx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 572 | |
| 573 | opt_recv = &hctx->ccid3hctx_options_received; |
| 574 | |
| 575 | if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { |
| 576 | opt_recv->ccid3or_seqno = dp->dccps_gsr; |
| 577 | opt_recv->ccid3or_loss_event_rate = ~0; |
| 578 | opt_recv->ccid3or_loss_intervals_idx = 0; |
| 579 | opt_recv->ccid3or_loss_intervals_len = 0; |
| 580 | opt_recv->ccid3or_receive_rate = 0; |
| 581 | } |
| 582 | |
| 583 | switch (option) { |
| 584 | case TFRC_OPT_LOSS_EVENT_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 585 | if (unlikely(len != 4)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 586 | DCCP_WARN("%s(%p), invalid len %d " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 587 | "for TFRC_OPT_LOSS_EVENT_RATE\n", |
| 588 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 589 | rc = -EINVAL; |
| 590 | } else { |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 591 | opt_recv->ccid3or_loss_event_rate = |
| 592 | ntohl(*(__be32 *)value); |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 593 | ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 594 | dccp_role(sk), sk, |
| 595 | opt_recv->ccid3or_loss_event_rate); |
| 596 | } |
| 597 | break; |
| 598 | case TFRC_OPT_LOSS_INTERVALS: |
| 599 | opt_recv->ccid3or_loss_intervals_idx = idx; |
| 600 | opt_recv->ccid3or_loss_intervals_len = len; |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 601 | ccid3_pr_debug("%s(%p), LOSS_INTERVALS=(%u, %u)\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 602 | dccp_role(sk), sk, |
| 603 | opt_recv->ccid3or_loss_intervals_idx, |
| 604 | opt_recv->ccid3or_loss_intervals_len); |
| 605 | break; |
| 606 | case TFRC_OPT_RECEIVE_RATE: |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 607 | if (unlikely(len != 4)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 608 | DCCP_WARN("%s(%p), invalid len %d " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 609 | "for TFRC_OPT_RECEIVE_RATE\n", |
| 610 | dccp_role(sk), sk, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 611 | rc = -EINVAL; |
| 612 | } else { |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 613 | opt_recv->ccid3or_receive_rate = |
| 614 | ntohl(*(__be32 *)value); |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 615 | ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 616 | dccp_role(sk), sk, |
| 617 | opt_recv->ccid3or_receive_rate); |
| 618 | } |
| 619 | break; |
| 620 | } |
| 621 | |
| 622 | return rc; |
| 623 | } |
| 624 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 625 | 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] | 626 | { |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 627 | struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 628 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 629 | hctx->ccid3hctx_s = 0; |
Gerrit Renker | fe0499a | 2006-12-10 00:06:01 -0200 | [diff] [blame] | 630 | hctx->ccid3hctx_rtt = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 631 | hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; |
| 632 | INIT_LIST_HEAD(&hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | aa5d7df | 2006-03-20 17:35:13 -0800 | [diff] [blame] | 633 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 634 | hctx->ccid3hctx_no_feedback_timer.function = |
| 635 | ccid3_hc_tx_no_feedback_timer; |
Arnaldo Carvalho de Melo | aa5d7df | 2006-03-20 17:35:13 -0800 | [diff] [blame] | 636 | hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 637 | init_timer(&hctx->ccid3hctx_no_feedback_timer); |
| 638 | |
| 639 | return 0; |
| 640 | } |
| 641 | |
| 642 | static void ccid3_hc_tx_exit(struct sock *sk) |
| 643 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 644 | 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] | 645 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 646 | BUG_ON(hctx == NULL); |
| 647 | |
| 648 | ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); |
| 649 | sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); |
| 650 | |
| 651 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 652 | dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 653 | } |
| 654 | |
Gerrit Renker | 9bf1747 | 2007-03-20 13:11:24 -0300 | [diff] [blame] | 655 | static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) |
| 656 | { |
| 657 | 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] | 658 | |
Gerrit Renker | 9bf1747 | 2007-03-20 13:11:24 -0300 | [diff] [blame] | 659 | /* Listen socks doesn't have a private CCID block */ |
| 660 | if (sk->sk_state == DCCP_LISTEN) |
| 661 | return; |
| 662 | |
| 663 | BUG_ON(hctx == NULL); |
| 664 | |
| 665 | info->tcpi_rto = hctx->ccid3hctx_t_rto; |
| 666 | info->tcpi_rtt = hctx->ccid3hctx_rtt; |
| 667 | } |
| 668 | |
| 669 | static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, |
| 670 | u32 __user *optval, int __user *optlen) |
| 671 | { |
| 672 | const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); |
| 673 | const void *val; |
| 674 | |
| 675 | /* Listen socks doesn't have a private CCID block */ |
| 676 | if (sk->sk_state == DCCP_LISTEN) |
| 677 | return -EINVAL; |
| 678 | |
| 679 | switch (optname) { |
| 680 | case DCCP_SOCKOPT_CCID_TX_INFO: |
| 681 | if (len < sizeof(hctx->ccid3hctx_tfrc)) |
| 682 | return -EINVAL; |
| 683 | len = sizeof(hctx->ccid3hctx_tfrc); |
| 684 | val = &hctx->ccid3hctx_tfrc; |
| 685 | break; |
| 686 | default: |
| 687 | return -ENOPROTOOPT; |
| 688 | } |
| 689 | |
| 690 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 691 | return -EFAULT; |
| 692 | |
| 693 | return 0; |
| 694 | } |
| 695 | |
| 696 | /* |
| 697 | * Receiver Half-Connection Routines |
| 698 | */ |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 699 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 700 | static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) |
| 701 | { |
| 702 | static char *ccid3_rx_state_names[] = { |
| 703 | [TFRC_RSTATE_NO_DATA] = "NO_DATA", |
| 704 | [TFRC_RSTATE_DATA] = "DATA", |
| 705 | [TFRC_RSTATE_TERM] = "TERM", |
| 706 | }; |
| 707 | |
| 708 | return ccid3_rx_state_names[state]; |
| 709 | } |
| 710 | #endif |
| 711 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 712 | static void ccid3_hc_rx_set_state(struct sock *sk, |
| 713 | enum ccid3_hc_rx_states state) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 714 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 715 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 716 | enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; |
| 717 | |
| 718 | ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 719 | dccp_role(sk), sk, ccid3_rx_state_name(oldstate), |
| 720 | ccid3_rx_state_name(state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 721 | WARN_ON(state == oldstate); |
| 722 | hcrx->ccid3hcrx_state = state; |
| 723 | } |
| 724 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 725 | static inline void ccid3_hc_rx_update_s(struct ccid3_hc_rx_sock *hcrx, int len) |
| 726 | { |
| 727 | if (unlikely(len == 0)) /* don't update on empty packets (e.g. ACKs) */ |
| 728 | ccid3_pr_debug("Packet payload length is 0 - not updating\n"); |
| 729 | else |
| 730 | hcrx->ccid3hcrx_s = hcrx->ccid3hcrx_s == 0 ? len : |
| 731 | (9 * hcrx->ccid3hcrx_s + len) / 10; |
| 732 | } |
| 733 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 734 | static void ccid3_hc_rx_send_feedback(struct sock *sk) |
| 735 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 736 | 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] | 737 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 738 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 739 | struct timeval now; |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 740 | suseconds_t delta; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 741 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 742 | ccid3_pr_debug("%s(%p) - entry \n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 743 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 744 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 745 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 746 | switch (hcrx->ccid3hcrx_state) { |
| 747 | case TFRC_RSTATE_NO_DATA: |
| 748 | hcrx->ccid3hcrx_x_recv = 0; |
| 749 | break; |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 750 | case TFRC_RSTATE_DATA: |
| 751 | delta = timeval_delta(&now, |
| 752 | &hcrx->ccid3hcrx_tstamp_last_feedback); |
| 753 | DCCP_BUG_ON(delta < 0); |
Gerrit Renker | b9039a2 | 2006-12-10 00:02:51 -0200 | [diff] [blame] | 754 | hcrx->ccid3hcrx_x_recv = |
| 755 | scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 756 | break; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 757 | case TFRC_RSTATE_TERM: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 758 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 759 | return; |
| 760 | } |
| 761 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 762 | packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 763 | if (unlikely(packet == NULL)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 764 | DCCP_WARN("%s(%p), no data packet in history!\n", |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 765 | dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 766 | return; |
| 767 | } |
| 768 | |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 769 | hcrx->ccid3hcrx_tstamp_last_feedback = now; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 770 | hcrx->ccid3hcrx_ccval_last_counter = packet->dccphrx_ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 771 | hcrx->ccid3hcrx_bytes_recv = 0; |
| 772 | |
Gerrit Renker | 0f9e5b5 | 2006-12-10 00:03:51 -0200 | [diff] [blame] | 773 | /* Elapsed time information [RFC 4340, 13.2] in units of 10 * usecs */ |
| 774 | delta = timeval_delta(&now, &packet->dccphrx_tstamp); |
| 775 | DCCP_BUG_ON(delta < 0); |
| 776 | hcrx->ccid3hcrx_elapsed_time = delta / 10; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 777 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 778 | if (hcrx->ccid3hcrx_p == 0) |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 779 | hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */ |
| 780 | else if (hcrx->ccid3hcrx_p > 1000000) { |
| 781 | DCCP_WARN("p (%u) > 100%%\n", hcrx->ccid3hcrx_p); |
| 782 | hcrx->ccid3hcrx_pinv = 1; /* use 100% in this case */ |
| 783 | } else |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 784 | hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; |
Gerrit Renker | 45393a6 | 2006-12-09 23:59:14 -0200 | [diff] [blame] | 785 | |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 786 | dp->dccps_hc_rx_insert_options = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 787 | dccp_send_ack(sk); |
| 788 | } |
| 789 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 790 | 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] | 791 | { |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 792 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 793 | __be32 x_recv, pinv; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 794 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 795 | BUG_ON(hcrx == NULL); |
| 796 | |
| 797 | 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] | 798 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 799 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 800 | 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] | 801 | |
| 802 | if (dccp_packet_without_ack(skb)) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 803 | return 0; |
| 804 | |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 805 | x_recv = htonl(hcrx->ccid3hcrx_x_recv); |
| 806 | pinv = htonl(hcrx->ccid3hcrx_pinv); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 807 | |
| 808 | if ((hcrx->ccid3hcrx_elapsed_time != 0 && |
| 809 | dccp_insert_option_elapsed_time(sk, skb, |
| 810 | hcrx->ccid3hcrx_elapsed_time)) || |
| 811 | dccp_insert_option_timestamp(sk, skb) || |
| 812 | dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 813 | &pinv, sizeof(pinv)) || |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 814 | dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 815 | &x_recv, sizeof(x_recv))) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 816 | return -1; |
| 817 | |
| 818 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 819 | } |
| 820 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 821 | static int ccid3_hc_rx_detect_loss(struct sock *sk, |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 822 | struct dccp_rx_hist_entry *packet) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 823 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 824 | struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 825 | struct dccp_rx_hist_entry *rx_hist = |
| 826 | dccp_rx_hist_head(&hcrx->ccid3hcrx_hist); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 827 | u64 seqno = packet->dccphrx_seqno; |
| 828 | u64 tmp_seqno; |
| 829 | int loss = 0; |
| 830 | u8 ccval; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 831 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 832 | |
| 833 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 834 | |
| 835 | if (!rx_hist || |
| 836 | follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 837 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 838 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 839 | goto detect_out; |
| 840 | } |
| 841 | |
| 842 | |
| 843 | while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno) |
| 844 | > TFRC_RECV_NUM_LATE_LOSS) { |
| 845 | loss = 1; |
Arnaldo Carvalho de Melo | cc4d6a3 | 2007-05-28 18:53:08 -0300 | [diff] [blame^] | 846 | dccp_li_update_li(sk, |
Arnaldo Carvalho de Melo | cc0a910 | 2007-06-14 17:41:28 -0300 | [diff] [blame] | 847 | &hcrx->ccid3hcrx_li_hist, |
| 848 | &hcrx->ccid3hcrx_hist, |
| 849 | &hcrx->ccid3hcrx_tstamp_last_feedback, |
| 850 | hcrx->ccid3hcrx_s, |
| 851 | hcrx->ccid3hcrx_bytes_recv, |
| 852 | hcrx->ccid3hcrx_x_recv, |
| 853 | hcrx->ccid3hcrx_seqno_nonloss, |
| 854 | hcrx->ccid3hcrx_ccval_nonloss); |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 855 | tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss; |
| 856 | dccp_inc_seqno(&tmp_seqno); |
| 857 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
| 858 | dccp_inc_seqno(&tmp_seqno); |
| 859 | while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist, |
| 860 | tmp_seqno, &ccval)) { |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 861 | hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 862 | hcrx->ccid3hcrx_ccval_nonloss = ccval; |
| 863 | dccp_inc_seqno(&tmp_seqno); |
| 864 | } |
| 865 | } |
| 866 | |
| 867 | /* FIXME - this code could be simplified with above while */ |
| 868 | /* but works at moment */ |
| 869 | if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) { |
| 870 | hcrx->ccid3hcrx_seqno_nonloss = seqno; |
| 871 | hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval; |
| 872 | } |
| 873 | |
| 874 | detect_out: |
| 875 | dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, |
| 876 | &hcrx->ccid3hcrx_li_hist, packet, |
| 877 | hcrx->ccid3hcrx_seqno_nonloss); |
| 878 | return loss; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 879 | } |
| 880 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 881 | static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 882 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 883 | 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] | 884 | const struct dccp_options_received *opt_recv; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 885 | struct dccp_rx_hist_entry *packet; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 886 | struct timeval now; |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 887 | u32 p_prev, r_sample, rtt_prev; |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 888 | int loss, payload_size; |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 889 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 890 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 891 | |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 892 | opt_recv = &dccp_sk(sk)->dccps_options_received; |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 893 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 894 | switch (DCCP_SKB_CB(skb)->dccpd_type) { |
| 895 | case DCCP_PKT_ACK: |
| 896 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 897 | return; |
| 898 | case DCCP_PKT_DATAACK: |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 899 | if (opt_recv->dccpor_timestamp_echo == 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 900 | break; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 901 | rtt_prev = hcrx->ccid3hcrx_rtt; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 902 | dccp_timestamp(sk, &now); |
Gerrit Renker | 7dfee1a | 2007-03-20 15:24:37 -0300 | [diff] [blame] | 903 | r_sample = dccp_sample_rtt(sk, &now, NULL); |
Arnaldo Carvalho de Melo | b3a3077 | 2005-09-09 02:34:10 -0300 | [diff] [blame] | 904 | |
| 905 | if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) |
| 906 | hcrx->ccid3hcrx_rtt = r_sample; |
| 907 | else |
| 908 | hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + |
| 909 | r_sample / 10; |
| 910 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 911 | if (rtt_prev != hcrx->ccid3hcrx_rtt) |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 912 | ccid3_pr_debug("%s(%p), New RTT=%uus, elapsed time=%u\n", |
| 913 | dccp_role(sk), sk, hcrx->ccid3hcrx_rtt, |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 914 | opt_recv->dccpor_elapsed_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 915 | break; |
| 916 | case DCCP_PKT_DATA: |
| 917 | break; |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 918 | 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] | 919 | return; |
| 920 | } |
| 921 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 922 | packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, |
Christoph Lameter | 54e6ecb | 2006-12-06 20:33:16 -0800 | [diff] [blame] | 923 | skb, GFP_ATOMIC); |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 924 | if (unlikely(packet == NULL)) { |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 925 | DCCP_WARN("%s(%p), Not enough mem to add rx packet " |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 926 | "to history, consider it lost!\n", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 927 | return; |
| 928 | } |
| 929 | |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 930 | loss = ccid3_hc_rx_detect_loss(sk, packet); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 931 | |
| 932 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) |
| 933 | return; |
| 934 | |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 935 | payload_size = skb->len - dccp_hdr(skb)->dccph_doff * 4; |
| 936 | ccid3_hc_rx_update_s(hcrx, payload_size); |
| 937 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 938 | switch (hcrx->ccid3hcrx_state) { |
| 939 | case TFRC_RSTATE_NO_DATA: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 940 | ccid3_pr_debug("%s(%p, state=%s), skb=%p, sending initial " |
| 941 | "feedback\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 942 | dccp_state_name(sk->sk_state), skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 943 | ccid3_hc_rx_send_feedback(sk); |
| 944 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); |
| 945 | return; |
| 946 | case TFRC_RSTATE_DATA: |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 947 | hcrx->ccid3hcrx_bytes_recv += payload_size; |
Ian McDonald | 66a377c | 2006-08-26 23:40:50 -0700 | [diff] [blame] | 948 | if (loss) |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 949 | break; |
| 950 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 951 | dccp_timestamp(sk, &now); |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 952 | if ((timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) - |
| 953 | (suseconds_t)hcrx->ccid3hcrx_rtt) >= 0) { |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 954 | hcrx->ccid3hcrx_tstamp_last_ack = now; |
| 955 | ccid3_hc_rx_send_feedback(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 956 | } |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 957 | return; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 958 | case TFRC_RSTATE_TERM: |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 959 | DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 960 | return; |
| 961 | } |
| 962 | |
| 963 | /* Dealing with packet loss */ |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 964 | ccid3_pr_debug("%s(%p, state=%s), data loss! Reacting...\n", |
Arnaldo Carvalho de Melo | 4fded33 | 2005-08-23 21:51:59 -0700 | [diff] [blame] | 965 | dccp_role(sk), sk, dccp_state_name(sk->sk_state)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 966 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 967 | p_prev = hcrx->ccid3hcrx_p; |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 968 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 969 | /* Calculate loss event rate */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 970 | if (!list_empty(&hcrx->ccid3hcrx_li_hist)) { |
| 971 | u32 i_mean = dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); |
| 972 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 973 | /* Scaling up by 1000000 as fixed decimal */ |
Ian McDonald | c099666 | 2006-03-03 17:54:46 -0800 | [diff] [blame] | 974 | if (i_mean != 0) |
| 975 | hcrx->ccid3hcrx_p = 1000000 / i_mean; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 976 | } else |
| 977 | DCCP_BUG("empty loss history"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 978 | |
| 979 | if (hcrx->ccid3hcrx_p > p_prev) { |
| 980 | ccid3_hc_rx_send_feedback(sk); |
| 981 | return; |
| 982 | } |
| 983 | } |
| 984 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 985 | 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] | 986 | { |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 987 | struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 988 | |
Gerrit Renker | a967241 | 2006-12-10 00:14:12 -0200 | [diff] [blame] | 989 | ccid3_pr_debug("entry\n"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 990 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 991 | hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; |
| 992 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | ae6706f | 2005-08-27 23:03:09 -0300 | [diff] [blame] | 993 | INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 994 | dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); |
Arnaldo Carvalho de Melo | 954ee31 | 2005-09-09 02:37:05 -0300 | [diff] [blame] | 995 | hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; |
Gerrit Renker | 78ad713 | 2006-11-28 19:22:33 -0200 | [diff] [blame] | 996 | hcrx->ccid3hcrx_s = 0; |
Gerrit Renker | fe0499a | 2006-12-10 00:06:01 -0200 | [diff] [blame] | 997 | hcrx->ccid3hcrx_rtt = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 998 | return 0; |
| 999 | } |
| 1000 | |
| 1001 | static void ccid3_hc_rx_exit(struct sock *sk) |
| 1002 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1003 | 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] | 1004 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1005 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1006 | |
| 1007 | ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); |
| 1008 | |
| 1009 | /* Empty packet history */ |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1010 | dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1011 | |
| 1012 | /* Empty loss interval history */ |
Arnaldo Carvalho de Melo | cc4d6a3 | 2007-05-28 18:53:08 -0300 | [diff] [blame^] | 1013 | dccp_li_hist_purge(&hcrx->ccid3hcrx_li_hist); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1014 | } |
| 1015 | |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1016 | static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) |
| 1017 | { |
Arnaldo Carvalho de Melo | 59725dc | 2005-09-09 02:40:58 -0300 | [diff] [blame] | 1018 | 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] | 1019 | |
Arnaldo Carvalho de Melo | 59c2353 | 2005-09-12 14:16:58 -0700 | [diff] [blame] | 1020 | /* Listen socks doesn't have a private CCID block */ |
| 1021 | if (sk->sk_state == DCCP_LISTEN) |
| 1022 | return; |
| 1023 | |
Arnaldo Carvalho de Melo | 59d203f | 2005-09-09 20:01:25 -0300 | [diff] [blame] | 1024 | BUG_ON(hcrx == NULL); |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1025 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 1026 | info->tcpi_ca_state = hcrx->ccid3hcrx_state; |
| 1027 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; |
| 1028 | info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1029 | } |
| 1030 | |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1031 | static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, |
| 1032 | u32 __user *optval, int __user *optlen) |
| 1033 | { |
| 1034 | const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); |
| 1035 | const void *val; |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 1036 | |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1037 | /* Listen socks doesn't have a private CCID block */ |
| 1038 | if (sk->sk_state == DCCP_LISTEN) |
| 1039 | return -EINVAL; |
| 1040 | |
| 1041 | switch (optname) { |
| 1042 | case DCCP_SOCKOPT_CCID_RX_INFO: |
| 1043 | if (len < sizeof(hcrx->ccid3hcrx_tfrc)) |
| 1044 | return -EINVAL; |
| 1045 | len = sizeof(hcrx->ccid3hcrx_tfrc); |
| 1046 | val = &hcrx->ccid3hcrx_tfrc; |
| 1047 | break; |
| 1048 | default: |
| 1049 | return -ENOPROTOOPT; |
| 1050 | } |
| 1051 | |
| 1052 | if (put_user(len, optlen) || copy_to_user(optval, val, len)) |
| 1053 | return -EFAULT; |
| 1054 | |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1058 | static struct ccid_operations ccid3 = { |
Ian McDonald | 3dd9a7c | 2006-09-22 14:26:44 +1200 | [diff] [blame] | 1059 | .ccid_id = DCCPC_CCID3, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1060 | .ccid_name = "ccid3", |
| 1061 | .ccid_owner = THIS_MODULE, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1062 | .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] | 1063 | .ccid_hc_tx_init = ccid3_hc_tx_init, |
| 1064 | .ccid_hc_tx_exit = ccid3_hc_tx_exit, |
| 1065 | .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, |
| 1066 | .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, |
| 1067 | .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1068 | .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 1069 | .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] | 1070 | .ccid_hc_rx_init = ccid3_hc_rx_init, |
| 1071 | .ccid_hc_rx_exit = ccid3_hc_rx_exit, |
| 1072 | .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, |
| 1073 | .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, |
Arnaldo Carvalho de Melo | 2babe1f | 2005-08-23 21:52:35 -0700 | [diff] [blame] | 1074 | .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, |
| 1075 | .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 1076 | .ccid_hc_rx_getsockopt = ccid3_hc_rx_getsockopt, |
| 1077 | .ccid_hc_tx_getsockopt = ccid3_hc_tx_getsockopt, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1078 | }; |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 1079 | |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1080 | #ifdef CONFIG_IP_DCCP_CCID3_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1081 | module_param(ccid3_debug, int, 0444); |
| 1082 | MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); |
Gerrit Renker | 56724aa | 2006-11-20 18:28:09 -0200 | [diff] [blame] | 1083 | #endif |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1084 | |
| 1085 | static __init int ccid3_module_init(void) |
| 1086 | { |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1087 | int rc = -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1088 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1089 | ccid3_rx_hist = dccp_rx_hist_new("ccid3"); |
| 1090 | if (ccid3_rx_hist == NULL) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1091 | goto out; |
| 1092 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1093 | ccid3_tx_hist = dccp_tx_hist_new("ccid3"); |
| 1094 | if (ccid3_tx_hist == NULL) |
| 1095 | goto out_free_rx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1096 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1097 | rc = ccid_register(&ccid3); |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 1098 | if (rc != 0) |
Arnaldo Carvalho de Melo | cc4d6a3 | 2007-05-28 18:53:08 -0300 | [diff] [blame^] | 1099 | goto out_free_tx; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1100 | out: |
| 1101 | return rc; |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1102 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1103 | out_free_tx: |
| 1104 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1105 | ccid3_tx_hist = NULL; |
| 1106 | out_free_rx: |
| 1107 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1108 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1109 | goto out; |
| 1110 | } |
| 1111 | module_init(ccid3_module_init); |
| 1112 | |
| 1113 | static __exit void ccid3_module_exit(void) |
| 1114 | { |
| 1115 | ccid_unregister(&ccid3); |
| 1116 | |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1117 | if (ccid3_tx_hist != NULL) { |
| 1118 | dccp_tx_hist_delete(ccid3_tx_hist); |
| 1119 | ccid3_tx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1120 | } |
Arnaldo Carvalho de Melo | 8c60f3f | 2005-08-10 12:59:38 -0300 | [diff] [blame] | 1121 | if (ccid3_rx_hist != NULL) { |
| 1122 | dccp_rx_hist_delete(ccid3_rx_hist); |
| 1123 | ccid3_rx_hist = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1124 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1125 | } |
| 1126 | module_exit(ccid3_module_exit); |
| 1127 | |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 1128 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, " |
Arnaldo Carvalho de Melo | 1f2333a | 2005-08-27 03:51:58 -0300 | [diff] [blame] | 1129 | "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1130 | MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); |
| 1131 | MODULE_LICENSE("GPL"); |
| 1132 | MODULE_ALIAS("net-dccp-ccid-3"); |