17c657876SArnaldo Carvalho de Melo /* 27c657876SArnaldo Carvalho de Melo * net/dccp/ccids/ccid3.c 37c657876SArnaldo Carvalho de Melo * 47c657876SArnaldo Carvalho de Melo * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand. 51bc09869SIan McDonald * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz> 67c657876SArnaldo Carvalho de Melo * 77c657876SArnaldo Carvalho de Melo * An implementation of the DCCP protocol 87c657876SArnaldo Carvalho de Melo * 97c657876SArnaldo Carvalho de Melo * This code has been developed by the University of Waikato WAND 107c657876SArnaldo Carvalho de Melo * research group. For further information please see http://www.wand.net.nz/ 117c657876SArnaldo Carvalho de Melo * 127c657876SArnaldo Carvalho de Melo * This code also uses code from Lulea University, rereleased as GPL by its 137c657876SArnaldo Carvalho de Melo * authors: 147c657876SArnaldo Carvalho de Melo * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon 157c657876SArnaldo Carvalho de Melo * 167c657876SArnaldo Carvalho de Melo * Changes to meet Linux coding standards, to make it meet latest ccid3 draft 177c657876SArnaldo Carvalho de Melo * and to make it work as a loadable module in the DCCP stack written by 187c657876SArnaldo Carvalho de Melo * Arnaldo Carvalho de Melo <acme@conectiva.com.br>. 197c657876SArnaldo Carvalho de Melo * 207c657876SArnaldo Carvalho de Melo * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> 217c657876SArnaldo Carvalho de Melo * 227c657876SArnaldo Carvalho de Melo * This program is free software; you can redistribute it and/or modify 237c657876SArnaldo Carvalho de Melo * it under the terms of the GNU General Public License as published by 247c657876SArnaldo Carvalho de Melo * the Free Software Foundation; either version 2 of the License, or 257c657876SArnaldo Carvalho de Melo * (at your option) any later version. 267c657876SArnaldo Carvalho de Melo * 277c657876SArnaldo Carvalho de Melo * This program is distributed in the hope that it will be useful, 287c657876SArnaldo Carvalho de Melo * but WITHOUT ANY WARRANTY; without even the implied warranty of 297c657876SArnaldo Carvalho de Melo * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 307c657876SArnaldo Carvalho de Melo * GNU General Public License for more details. 317c657876SArnaldo Carvalho de Melo * 327c657876SArnaldo Carvalho de Melo * You should have received a copy of the GNU General Public License 337c657876SArnaldo Carvalho de Melo * along with this program; if not, write to the Free Software 347c657876SArnaldo Carvalho de Melo * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 357c657876SArnaldo Carvalho de Melo */ 367c657876SArnaldo Carvalho de Melo 378c60f3faSArnaldo Carvalho de Melo #include <linux/config.h> 387c657876SArnaldo Carvalho de Melo #include "../ccid.h" 397c657876SArnaldo Carvalho de Melo #include "../dccp.h" 404524b259SArnaldo Carvalho de Melo #include "lib/packet_history.h" 41ae6706f0SArnaldo Carvalho de Melo #include "lib/loss_interval.h" 4236729c1aSArnaldo Carvalho de Melo #include "lib/tfrc.h" 437c657876SArnaldo Carvalho de Melo #include "ccid3.h" 447c657876SArnaldo Carvalho de Melo 456b5e633aSArnaldo Carvalho de Melo /* 460ba7a3baSArnaldo Carvalho de Melo * Reason for maths here is to avoid 32 bit overflow when a is big. 470ba7a3baSArnaldo Carvalho de Melo * With this we get close to the limit. 486b5e633aSArnaldo Carvalho de Melo */ 496b5e633aSArnaldo Carvalho de Melo static inline u32 usecs_div(const u32 a, const u32 b) 506b5e633aSArnaldo Carvalho de Melo { 510ba7a3baSArnaldo Carvalho de Melo const u32 div = a < (UINT_MAX / (USEC_PER_SEC / 10)) ? 10 : 520ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 50)) ? 50 : 530ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 100)) ? 100 : 540ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 500)) ? 500 : 550ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 1000)) ? 1000 : 560ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 5000)) ? 5000 : 570ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 : 580ba7a3baSArnaldo Carvalho de Melo a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 : 590ba7a3baSArnaldo Carvalho de Melo 100000; 600ba7a3baSArnaldo Carvalho de Melo const u32 tmp = a * (USEC_PER_SEC / div); 610ba7a3baSArnaldo Carvalho de Melo return (b >= 2 * div) ? tmp / (b / div) : tmp; 626b5e633aSArnaldo Carvalho de Melo } 636b5e633aSArnaldo Carvalho de Melo 64cfc3c525SArnaldo Carvalho de Melo static int ccid3_debug; 657c657876SArnaldo Carvalho de Melo 66cfc3c525SArnaldo Carvalho de Melo #ifdef CCID3_DEBUG 677c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) \ 687c657876SArnaldo Carvalho de Melo do { if (ccid3_debug) \ 697c657876SArnaldo Carvalho de Melo printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \ 707c657876SArnaldo Carvalho de Melo } while (0) 717c657876SArnaldo Carvalho de Melo #else 727c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) 737c657876SArnaldo Carvalho de Melo #endif 747c657876SArnaldo Carvalho de Melo 75a1d3a355SArnaldo Carvalho de Melo static struct dccp_tx_hist *ccid3_tx_hist; 76a1d3a355SArnaldo Carvalho de Melo static struct dccp_rx_hist *ccid3_rx_hist; 77ae6706f0SArnaldo Carvalho de Melo static struct dccp_li_hist *ccid3_li_hist; 787c657876SArnaldo Carvalho de Melo 797c657876SArnaldo Carvalho de Melo static int ccid3_init(struct sock *sk) 807c657876SArnaldo Carvalho de Melo { 817c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 827c657876SArnaldo Carvalho de Melo return 0; 837c657876SArnaldo Carvalho de Melo } 847c657876SArnaldo Carvalho de Melo 857c657876SArnaldo Carvalho de Melo static void ccid3_exit(struct sock *sk) 867c657876SArnaldo Carvalho de Melo { 877c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 887c657876SArnaldo Carvalho de Melo } 897c657876SArnaldo Carvalho de Melo 907c657876SArnaldo Carvalho de Melo /* TFRC sender states */ 917c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states { 927c657876SArnaldo Carvalho de Melo TFRC_SSTATE_NO_SENT = 1, 937c657876SArnaldo Carvalho de Melo TFRC_SSTATE_NO_FBACK, 947c657876SArnaldo Carvalho de Melo TFRC_SSTATE_FBACK, 957c657876SArnaldo Carvalho de Melo TFRC_SSTATE_TERM, 967c657876SArnaldo Carvalho de Melo }; 977c657876SArnaldo Carvalho de Melo 987c657876SArnaldo Carvalho de Melo #ifdef CCID3_DEBUG 997c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 1007c657876SArnaldo Carvalho de Melo { 1017c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 1027c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 1037c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 1047c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 1057c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 1067c657876SArnaldo Carvalho de Melo }; 1077c657876SArnaldo Carvalho de Melo 1087c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 1097c657876SArnaldo Carvalho de Melo } 1107c657876SArnaldo Carvalho de Melo #endif 1117c657876SArnaldo Carvalho de Melo 1121f2333aeSArnaldo Carvalho de Melo static inline void ccid3_hc_tx_set_state(struct sock *sk, 1131f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 1147c657876SArnaldo Carvalho de Melo { 1157c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 1167c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 1177c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 1187c657876SArnaldo Carvalho de Melo 1197c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 1201f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 1211f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 1227c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 1237c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 1247c657876SArnaldo Carvalho de Melo } 1257c657876SArnaldo Carvalho de Melo 1267c657876SArnaldo Carvalho de Melo /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ 1277c657876SArnaldo Carvalho de Melo static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx) 1287c657876SArnaldo Carvalho de Melo { 1296b5e633aSArnaldo Carvalho de Melo /* 1306b5e633aSArnaldo Carvalho de Melo * If no feedback spec says t_ipi is 1 second (set elsewhere and then 1316b5e633aSArnaldo Carvalho de Melo * doubles after every no feedback timer (separate function) 1326b5e633aSArnaldo Carvalho de Melo */ 1336b5e633aSArnaldo Carvalho de Melo if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK) 1346b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, 1356b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x); 1367c657876SArnaldo Carvalho de Melo } 1377c657876SArnaldo Carvalho de Melo 1387c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1397c657876SArnaldo Carvalho de Melo static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx) 1407c657876SArnaldo Carvalho de Melo { 1411f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 1421f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1437c657876SArnaldo Carvalho de Melo } 1447c657876SArnaldo Carvalho de Melo 1457c657876SArnaldo Carvalho de Melo /* 1467c657876SArnaldo Carvalho de Melo * Update X by 1477c657876SArnaldo Carvalho de Melo * If (p > 0) 1487c657876SArnaldo Carvalho de Melo * x_calc = calcX(s, R, p); 1497c657876SArnaldo Carvalho de Melo * X = max(min(X_calc, 2 * X_recv), s / t_mbi); 1507c657876SArnaldo Carvalho de Melo * Else 1517c657876SArnaldo Carvalho de Melo * If (now - tld >= R) 1527c657876SArnaldo Carvalho de Melo * X = max(min(2 * X, 2 * X_recv), s / R); 1537c657876SArnaldo Carvalho de Melo * tld = now; 1547c657876SArnaldo Carvalho de Melo */ 1557c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_update_x(struct sock *sk) 1567c657876SArnaldo Carvalho de Melo { 1577c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 1587c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 1597c657876SArnaldo Carvalho de Melo 1601f2333aeSArnaldo Carvalho de Melo /* To avoid large error in calcX */ 1611f2333aeSArnaldo Carvalho de Melo if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { 16236729c1aSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, 1637c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, 1647c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p); 1651f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, 1661f2333aeSArnaldo Carvalho de Melo 2 * hctx->ccid3hctx_x_recv), 1671f2333aeSArnaldo Carvalho de Melo (hctx->ccid3hctx_s / 1681f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)); 169b6ee3d4aSArnaldo Carvalho de Melo } else { 170b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 171b6ee3d4aSArnaldo Carvalho de Melo 172b6ee3d4aSArnaldo Carvalho de Melo do_gettimeofday(&now); 173b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= 174b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt) { 1756b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, 1766b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x) * 2, 1776b5e633aSArnaldo Carvalho de Melo usecs_div(hctx->ccid3hctx_s, 1786b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 179b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 180b6ee3d4aSArnaldo Carvalho de Melo } 1817c657876SArnaldo Carvalho de Melo } 1827c657876SArnaldo Carvalho de Melo } 1837c657876SArnaldo Carvalho de Melo 1847c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1857c657876SArnaldo Carvalho de Melo { 1867c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 1877c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 1887c657876SArnaldo Carvalho de Melo unsigned long next_tmout = 0; 1897c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 1907c657876SArnaldo Carvalho de Melo 1917c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 1927c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 1937c657876SArnaldo Carvalho de Melo /* Try again later. */ 1947c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 1951f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 1961f2333aeSArnaldo Carvalho de Melo jiffies + HZ / 5); 1977c657876SArnaldo Carvalho de Melo goto out; 1987c657876SArnaldo Carvalho de Melo } 1997c657876SArnaldo Carvalho de Melo 2007c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, 2017c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2027c657876SArnaldo Carvalho de Melo 2037c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 2047c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_TERM: 2057c657876SArnaldo Carvalho de Melo goto out; 2067c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 2077c657876SArnaldo Carvalho de Melo /* Halve send rate */ 2087c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x /= 2; 2096b5e633aSArnaldo Carvalho de Melo if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / 2106b5e633aSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)) 2111f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = (hctx->ccid3hctx_s / 2121f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME); 2137c657876SArnaldo Carvalho de Melo 2141f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " 2151f2333aeSArnaldo Carvalho de Melo "bytes/s\n", 2161f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2171f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2187c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x); 2196b5e633aSArnaldo Carvalho de Melo next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s, 2206b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x), 2211f2333aeSArnaldo Carvalho de Melo TFRC_INITIAL_TIMEOUT); 2221f2333aeSArnaldo Carvalho de Melo /* 2231f2333aeSArnaldo Carvalho de Melo * FIXME - not sure above calculation is correct. See section 2241f2333aeSArnaldo Carvalho de Melo * 5 of CCID3 11 should adjust tx_t_ipi and double that to 2251f2333aeSArnaldo Carvalho de Melo * achieve it really 2261f2333aeSArnaldo Carvalho de Melo */ 2277c657876SArnaldo Carvalho de Melo break; 2287c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2291f2333aeSArnaldo Carvalho de Melo /* 2301f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 2311f2333aeSArnaldo Carvalho de Melo * 4 packets per RTT 2321f2333aeSArnaldo Carvalho de Melo */ 2331f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2346b5e633aSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_recv >= 2356b5e633aSArnaldo Carvalho de Melo 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { 2361f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", 2371f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2387c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2397c657876SArnaldo Carvalho de Melo /* Halve sending rate */ 2407c657876SArnaldo Carvalho de Melo 2417c657876SArnaldo Carvalho de Melo /* If (X_calc > 2 * X_recv) 2427c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2437c657876SArnaldo Carvalho de Melo * Else 2447c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2457c657876SArnaldo Carvalho de Melo */ 2461f2333aeSArnaldo Carvalho de Melo BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && 2471f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc == 0); 2487c657876SArnaldo Carvalho de Melo 2497c657876SArnaldo Carvalho de Melo /* check also if p is zero -> x_calc is infinity? */ 2507c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || 2517c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) 2527c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, 2537c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); 2547c657876SArnaldo Carvalho de Melo else 2557c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; 2567c657876SArnaldo Carvalho de Melo 2577c657876SArnaldo Carvalho de Melo /* Update sending rate */ 2587c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 2597c657876SArnaldo Carvalho de Melo } 2606b5e633aSArnaldo Carvalho de Melo /* 2616b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2626b5e633aSArnaldo Carvalho de Melo * max(4 * R, 2 * s / X) 2636b5e633aSArnaldo Carvalho de Melo */ 264c68e64cfSArnaldo Carvalho de Melo next_tmout = max_t(u32, hctx->ccid3hctx_t_rto, 2656b5e633aSArnaldo Carvalho de Melo 2 * usecs_div(hctx->ccid3hctx_s, 2666b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x)); 2677c657876SArnaldo Carvalho de Melo break; 2687c657876SArnaldo Carvalho de Melo default: 2697c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 2707c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 2717c657876SArnaldo Carvalho de Melo dump_stack(); 2727c657876SArnaldo Carvalho de Melo goto out; 2737c657876SArnaldo Carvalho de Melo } 2747c657876SArnaldo Carvalho de Melo 2757c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2767c657876SArnaldo Carvalho de Melo jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); 2777c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 2787c657876SArnaldo Carvalho de Melo out: 2797c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2807c657876SArnaldo Carvalho de Melo sock_put(sk); 2817c657876SArnaldo Carvalho de Melo } 2827c657876SArnaldo Carvalho de Melo 28327258ee5SArnaldo Carvalho de Melo static int ccid3_hc_tx_send_packet(struct sock *sk, 28427258ee5SArnaldo Carvalho de Melo struct sk_buff *skb, int len) 2857c657876SArnaldo Carvalho de Melo { 2867c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 2877c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 2888c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *new_packet; 2897c657876SArnaldo Carvalho de Melo struct timeval now; 29027258ee5SArnaldo Carvalho de Melo long delay; 2917c657876SArnaldo Carvalho de Melo int rc = -ENOTCONN; 2927c657876SArnaldo Carvalho de Melo 2931f2333aeSArnaldo Carvalho de Melo /* Check if pure ACK or Terminating*/ 2941f2333aeSArnaldo Carvalho de Melo 2957c657876SArnaldo Carvalho de Melo /* 2961f2333aeSArnaldo Carvalho de Melo * XXX: We only call this function for DATA and DATAACK, on, these 2971f2333aeSArnaldo Carvalho de Melo * packets can have zero length, but why the comment about "pure ACK"? 2987c657876SArnaldo Carvalho de Melo */ 2991f2333aeSArnaldo Carvalho de Melo if (hctx == NULL || len == 0 || 3001f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_state == TFRC_SSTATE_TERM) 3017c657876SArnaldo Carvalho de Melo goto out; 3027c657876SArnaldo Carvalho de Melo 3037c657876SArnaldo Carvalho de Melo /* See if last packet allocated was not sent */ 3048c60f3faSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 3058c60f3faSArnaldo Carvalho de Melo if (new_packet == NULL || new_packet->dccphtx_sent) { 3061f2333aeSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, 3071f2333aeSArnaldo Carvalho de Melo SLAB_ATOMIC); 3087c657876SArnaldo Carvalho de Melo 3097c657876SArnaldo Carvalho de Melo rc = -ENOBUFS; 3107c657876SArnaldo Carvalho de Melo if (new_packet == NULL) { 3117c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, not enough mem to add " 3121f2333aeSArnaldo Carvalho de Melo "to history, send refused\n", 3131f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk); 3147c657876SArnaldo Carvalho de Melo goto out; 3157c657876SArnaldo Carvalho de Melo } 3167c657876SArnaldo Carvalho de Melo 3178c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); 3187c657876SArnaldo Carvalho de Melo } 3197c657876SArnaldo Carvalho de Melo 3207c657876SArnaldo Carvalho de Melo do_gettimeofday(&now); 3217c657876SArnaldo Carvalho de Melo 3227c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3237c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3241f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, first packet(%llu)\n", 3251f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, dp->dccps_gss); 3267c657876SArnaldo Carvalho de Melo 3277c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; 3287c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 3291f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3301f2333aeSArnaldo Carvalho de Melo jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); 3317c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3327c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3337c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3347c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi = TFRC_INITIAL_TIMEOUT; 3357c657876SArnaldo Carvalho de Melo 3367c657876SArnaldo Carvalho de Melo /* Set nominal send time for initial packet */ 3377c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 338b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 339b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 3407c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 3417c657876SArnaldo Carvalho de Melo rc = 0; 3427c657876SArnaldo Carvalho de Melo break; 3437c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3447c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 345b6ee3d4aSArnaldo Carvalho de Melo delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) - 346b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_delta); 34727258ee5SArnaldo Carvalho de Melo ccid3_pr_debug("send_packet delay=%ld\n", delay); 34827258ee5SArnaldo Carvalho de Melo delay /= -1000; 3497c657876SArnaldo Carvalho de Melo /* divide by -1000 is to convert to ms and get sign right */ 350d6809c12SArnaldo Carvalho de Melo rc = delay > 0 ? delay : 0; 3517c657876SArnaldo Carvalho de Melo break; 3527c657876SArnaldo Carvalho de Melo default: 3537c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 3547c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 3557c657876SArnaldo Carvalho de Melo dump_stack(); 3567c657876SArnaldo Carvalho de Melo rc = -EINVAL; 3577c657876SArnaldo Carvalho de Melo break; 3587c657876SArnaldo Carvalho de Melo } 3597c657876SArnaldo Carvalho de Melo 3607c657876SArnaldo Carvalho de Melo /* Can we send? if so add options and add to packet history */ 361507d37cfSArnaldo Carvalho de Melo if (rc == 0) { 362507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 363c1734376SArnaldo Carvalho de Melo new_packet->dccphtx_ccval = 3648c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = 3658c60f3faSArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count; 366507d37cfSArnaldo Carvalho de Melo } 3677c657876SArnaldo Carvalho de Melo out: 3687c657876SArnaldo Carvalho de Melo return rc; 3697c657876SArnaldo Carvalho de Melo } 3707c657876SArnaldo Carvalho de Melo 3717c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) 3727c657876SArnaldo Carvalho de Melo { 3737c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 3747c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 3757c657876SArnaldo Carvalho de Melo struct timeval now; 3767c657876SArnaldo Carvalho de Melo 3777c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 3787c657876SArnaldo Carvalho de Melo 3797c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) { 3807c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, while state is TFRC_SSTATE_TERM!\n", 3817c657876SArnaldo Carvalho de Melo dccp_role(sk), sk); 3827c657876SArnaldo Carvalho de Melo return; 3837c657876SArnaldo Carvalho de Melo } 3847c657876SArnaldo Carvalho de Melo 3857c657876SArnaldo Carvalho de Melo do_gettimeofday(&now); 3867c657876SArnaldo Carvalho de Melo 3877c657876SArnaldo Carvalho de Melo /* check if we have sent a data packet */ 3887c657876SArnaldo Carvalho de Melo if (len > 0) { 3897c657876SArnaldo Carvalho de Melo unsigned long quarter_rtt; 3908c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 3917c657876SArnaldo Carvalho de Melo 3928c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 3938c60f3faSArnaldo Carvalho de Melo if (packet == NULL) { 3941f2333aeSArnaldo Carvalho de Melo printk(KERN_CRIT "%s: packet doesn't exists in " 3951f2333aeSArnaldo Carvalho de Melo "history!\n", __FUNCTION__); 3967c657876SArnaldo Carvalho de Melo return; 3977c657876SArnaldo Carvalho de Melo } 3988c60f3faSArnaldo Carvalho de Melo if (packet->dccphtx_sent) { 3991f2333aeSArnaldo Carvalho de Melo printk(KERN_CRIT "%s: no unsent packet in history!\n", 4001f2333aeSArnaldo Carvalho de Melo __FUNCTION__); 4017c657876SArnaldo Carvalho de Melo return; 4027c657876SArnaldo Carvalho de Melo } 4038c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 4048c60f3faSArnaldo Carvalho de Melo packet->dccphtx_seqno = dp->dccps_gss; 4057c657876SArnaldo Carvalho de Melo /* 4061f2333aeSArnaldo Carvalho de Melo * Check if win_count have changed 4071f2333aeSArnaldo Carvalho de Melo * Algorithm in "8.1. Window Counter Valuer" in 4081f2333aeSArnaldo Carvalho de Melo * draft-ietf-dccp-ccid3-11.txt 4097c657876SArnaldo Carvalho de Melo */ 4106b5e633aSArnaldo Carvalho de Melo quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); 4116b5e633aSArnaldo Carvalho de Melo if (likely(hctx->ccid3hctx_rtt > 8)) 4126b5e633aSArnaldo Carvalho de Melo quarter_rtt /= hctx->ccid3hctx_rtt / 4; 4136b5e633aSArnaldo Carvalho de Melo 4147c657876SArnaldo Carvalho de Melo if (quarter_rtt > 0) { 4157c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 4167c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + 4177c657876SArnaldo Carvalho de Melo min_t(unsigned long, quarter_rtt, 5)) % 16; 4181f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, window changed from " 4191f2333aeSArnaldo Carvalho de Melo "%u to %u!\n", 4207c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 421c1734376SArnaldo Carvalho de Melo packet->dccphtx_ccval, 4227c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count); 4237c657876SArnaldo Carvalho de Melo } 4241f2333aeSArnaldo Carvalho de Melo 4257c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 0; 426c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 4278c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 4287c657876SArnaldo Carvalho de Melo } else 4297c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", 4307c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, dp->dccps_gss); 4317c657876SArnaldo Carvalho de Melo 4327c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4337c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 4347c657876SArnaldo Carvalho de Melo /* if first wasn't pure ack */ 4357c657876SArnaldo Carvalho de Melo if (len != 0) 4361f2333aeSArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, First packet sent is noted " 4371f2333aeSArnaldo Carvalho de Melo "as a data packet\n", 4387c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk)); 4397c657876SArnaldo Carvalho de Melo return; 4407c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4417c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4427c657876SArnaldo Carvalho de Melo if (len > 0) { 4437c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 4447c657876SArnaldo Carvalho de Melo ccid3_calc_new_t_ipi(hctx); 4457c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 446b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 447b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 4487c657876SArnaldo Carvalho de Melo } 4497c657876SArnaldo Carvalho de Melo break; 4507c657876SArnaldo Carvalho de Melo default: 4517c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 4527c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 4537c657876SArnaldo Carvalho de Melo dump_stack(); 4547c657876SArnaldo Carvalho de Melo break; 4557c657876SArnaldo Carvalho de Melo } 4567c657876SArnaldo Carvalho de Melo } 4577c657876SArnaldo Carvalho de Melo 4587c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4597c657876SArnaldo Carvalho de Melo { 4607c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 4617c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 4627c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4638c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 4647c657876SArnaldo Carvalho de Melo unsigned long next_tmout; 4651bc09869SIan McDonald u32 t_elapsed; 4667c657876SArnaldo Carvalho de Melo u32 pinv; 4677c657876SArnaldo Carvalho de Melo u32 x_recv; 4687c657876SArnaldo Carvalho de Melo u32 r_sample; 4691f2333aeSArnaldo Carvalho de Melo 4707c657876SArnaldo Carvalho de Melo if (hctx == NULL) 4717c657876SArnaldo Carvalho de Melo return; 4727c657876SArnaldo Carvalho de Melo 4737c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) { 4741f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, received a packet when " 4751f2333aeSArnaldo Carvalho de Melo "terminating!\n", dccp_role(sk), sk); 4767c657876SArnaldo Carvalho de Melo return; 4777c657876SArnaldo Carvalho de Melo } 4787c657876SArnaldo Carvalho de Melo 4797c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4807c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4817c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4827c657876SArnaldo Carvalho de Melo return; 4837c657876SArnaldo Carvalho de Melo 4847c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4857c657876SArnaldo Carvalho de Melo 4861a28599aSArnaldo Carvalho de Melo t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4877c657876SArnaldo Carvalho de Melo x_recv = opt_recv->ccid3or_receive_rate; 4887c657876SArnaldo Carvalho de Melo pinv = opt_recv->ccid3or_loss_event_rate; 4897c657876SArnaldo Carvalho de Melo 4907c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4917c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 4927c657876SArnaldo Carvalho de Melo /* FIXME: what to do here? */ 4937c657876SArnaldo Carvalho de Melo return; 4947c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4957c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4967c657876SArnaldo Carvalho de Melo /* Calculate new round trip sample by 4977c657876SArnaldo Carvalho de Melo * R_sample = (now - t_recvdata) - t_delay */ 4987c657876SArnaldo Carvalho de Melo /* get t_recvdata from history */ 4998c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 5008c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 5017c657876SArnaldo Carvalho de Melo if (packet == NULL) { 5021f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, seqno %llu(%s) does't " 5031f2333aeSArnaldo Carvalho de Melo "exist in history!\n", 5041f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5051f2333aeSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq, 5067c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 5077c657876SArnaldo Carvalho de Melo return; 5087c657876SArnaldo Carvalho de Melo } 5097c657876SArnaldo Carvalho de Melo 5107c657876SArnaldo Carvalho de Melo /* Update RTT */ 511b6ee3d4aSArnaldo Carvalho de Melo r_sample = timeval_now_delta(&packet->dccphtx_tstamp); 5121a28599aSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 5131a28599aSArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING 5141a28599aSArnaldo Carvalho de Melo "%s: r_sample=%uus, t_elapsed=%uus\n", 5151a28599aSArnaldo Carvalho de Melo __FUNCTION__, r_sample, t_elapsed); 5161a28599aSArnaldo Carvalho de Melo else 5171a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 5187c657876SArnaldo Carvalho de Melo 5197c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 5207c657876SArnaldo Carvalho de Melo * If (No feedback recv) 5217c657876SArnaldo Carvalho de Melo * R = R_sample; 5227c657876SArnaldo Carvalho de Melo * Else 5237c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 5247c657876SArnaldo Carvalho de Melo * 5257c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 5267c657876SArnaldo Carvalho de Melo */ 5277c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 5287c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 5297c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 5307c657876SArnaldo Carvalho de Melo } else 5311f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + 5321f2333aeSArnaldo Carvalho de Melo r_sample / 10; 5337c657876SArnaldo Carvalho de Melo 5341f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " 5351f2333aeSArnaldo Carvalho de Melo "r_sample=%us\n", dccp_role(sk), sk, 5361f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, r_sample); 5377c657876SArnaldo Carvalho de Melo 5387c657876SArnaldo Carvalho de Melo /* Update timeout interval */ 539c68e64cfSArnaldo Carvalho de Melo hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 540cef07fd6SArnaldo Carvalho de Melo USEC_PER_SEC); 5417c657876SArnaldo Carvalho de Melo 5427c657876SArnaldo Carvalho de Melo /* Update receive rate */ 5431f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ 5447c657876SArnaldo Carvalho de Melo 5457c657876SArnaldo Carvalho de Melo /* Update loss event rate */ 5467c657876SArnaldo Carvalho de Melo if (pinv == ~0 || pinv == 0) 5477c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 0; 5487c657876SArnaldo Carvalho de Melo else { 5497c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 1000000 / pinv; 5507c657876SArnaldo Carvalho de Melo 5517c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { 5527c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = TFRC_SMALLEST_P; 5531f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", 5541f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk); 5557c657876SArnaldo Carvalho de Melo } 5567c657876SArnaldo Carvalho de Melo } 5577c657876SArnaldo Carvalho de Melo 5587c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5597c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5607c657876SArnaldo Carvalho de Melo 5617c657876SArnaldo Carvalho de Melo /* Update sending rate */ 5627c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 5637c657876SArnaldo Carvalho de Melo 5647c657876SArnaldo Carvalho de Melo /* Update next send time */ 565b6ee3d4aSArnaldo Carvalho de Melo timeval_sub_usecs(&hctx->ccid3hctx_t_nom, 566b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 5677c657876SArnaldo Carvalho de Melo ccid3_calc_new_t_ipi(hctx); 568b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 569b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 5707c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 5717c657876SArnaldo Carvalho de Melo 5727c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5738c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5748c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 575c530cfb1SArnaldo Carvalho de Melo /* 576c530cfb1SArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible that 577c530cfb1SArnaldo Carvalho de Melo * we now can send a packet, so wake up dccp_wait_for_ccids. 578c530cfb1SArnaldo Carvalho de Melo */ 579c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5808c60f3faSArnaldo Carvalho de Melo 5811f2333aeSArnaldo Carvalho de Melo /* 5821f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5831f2333aeSArnaldo Carvalho de Melo * max(4 * R, 2 * s / X) 5841f2333aeSArnaldo Carvalho de Melo */ 585c68e64cfSArnaldo Carvalho de Melo next_tmout = max(hctx->ccid3hctx_t_rto, 5866b5e633aSArnaldo Carvalho de Melo 2 * usecs_div(hctx->ccid3hctx_s, 5876b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x)); 5887c657876SArnaldo Carvalho de Melo 5891f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " 5901f2333aeSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5911f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5921f2333aeSArnaldo Carvalho de Melo usecs_to_jiffies(next_tmout), next_tmout); 5937c657876SArnaldo Carvalho de Melo 5947c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5957c657876SArnaldo Carvalho de Melo jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); 5967c657876SArnaldo Carvalho de Melo 5977c657876SArnaldo Carvalho de Melo /* set idle flag */ 5987c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5997c657876SArnaldo Carvalho de Melo break; 6007c657876SArnaldo Carvalho de Melo default: 6017c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 6027c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 6037c657876SArnaldo Carvalho de Melo dump_stack(); 6047c657876SArnaldo Carvalho de Melo break; 6057c657876SArnaldo Carvalho de Melo } 6067c657876SArnaldo Carvalho de Melo } 6077c657876SArnaldo Carvalho de Melo 6087c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) 6097c657876SArnaldo Carvalho de Melo { 6107c657876SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 6117c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 6127c657876SArnaldo Carvalho de Melo 6131f2333aeSArnaldo Carvalho de Melo if (hctx == NULL || !(sk->sk_state == DCCP_OPEN || 6141f2333aeSArnaldo Carvalho de Melo sk->sk_state == DCCP_PARTOPEN)) 6157c657876SArnaldo Carvalho de Melo return; 6167c657876SArnaldo Carvalho de Melo 6177c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 6187c657876SArnaldo Carvalho de Melo } 6197c657876SArnaldo Carvalho de Melo 6207c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 6211f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 6221f2333aeSArnaldo Carvalho de Melo unsigned char *value) 6237c657876SArnaldo Carvalho de Melo { 6247c657876SArnaldo Carvalho de Melo int rc = 0; 6257c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6267c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 6277c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 6287c657876SArnaldo Carvalho de Melo 6297c657876SArnaldo Carvalho de Melo if (hctx == NULL) 6307c657876SArnaldo Carvalho de Melo return 0; 6317c657876SArnaldo Carvalho de Melo 6327c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 6337c657876SArnaldo Carvalho de Melo 6347c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 6357c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 6367c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 6377c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 6387c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 6397c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 6407c657876SArnaldo Carvalho de Melo } 6417c657876SArnaldo Carvalho de Melo 6427c657876SArnaldo Carvalho de Melo switch (option) { 6437c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 6447c657876SArnaldo Carvalho de Melo if (len != 4) { 6451f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, invalid len for " 6461f2333aeSArnaldo Carvalho de Melo "TFRC_OPT_LOSS_EVENT_RATE\n", 6477c657876SArnaldo Carvalho de Melo dccp_role(sk), sk); 6487c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6497c657876SArnaldo Carvalho de Melo } else { 6507c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ntohl(*(u32 *)value); 6517c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", 6527c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6537c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 6547c657876SArnaldo Carvalho de Melo } 6557c657876SArnaldo Carvalho de Melo break; 6567c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 6577c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 6587c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 6597c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", 6607c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6617c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 6627c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 6637c657876SArnaldo Carvalho de Melo break; 6647c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 6657c657876SArnaldo Carvalho de Melo if (len != 4) { 6661f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, invalid len for " 6671f2333aeSArnaldo Carvalho de Melo "TFRC_OPT_RECEIVE_RATE\n", 6687c657876SArnaldo Carvalho de Melo dccp_role(sk), sk); 6697c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6707c657876SArnaldo Carvalho de Melo } else { 6717c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = ntohl(*(u32 *)value); 6727c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", 6737c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6747c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6757c657876SArnaldo Carvalho de Melo } 6767c657876SArnaldo Carvalho de Melo break; 6777c657876SArnaldo Carvalho de Melo } 6787c657876SArnaldo Carvalho de Melo 6797c657876SArnaldo Carvalho de Melo return rc; 6807c657876SArnaldo Carvalho de Melo } 6817c657876SArnaldo Carvalho de Melo 6827c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct sock *sk) 6837c657876SArnaldo Carvalho de Melo { 6847c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6857c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx; 6867c657876SArnaldo Carvalho de Melo 6877c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 6887c657876SArnaldo Carvalho de Melo 6891f2333aeSArnaldo Carvalho de Melo hctx = dp->dccps_hc_tx_ccid_private = kmalloc(sizeof(*hctx), 6901f2333aeSArnaldo Carvalho de Melo gfp_any()); 6917c657876SArnaldo Carvalho de Melo if (hctx == NULL) 6927c657876SArnaldo Carvalho de Melo return -ENOMEM; 6937c657876SArnaldo Carvalho de Melo 6947c657876SArnaldo Carvalho de Melo memset(hctx, 0, sizeof(*hctx)); 6957c657876SArnaldo Carvalho de Melo 696a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 697a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 698a84ffe43SArnaldo Carvalho de Melo hctx->ccid3hctx_s = dp->dccps_packet_size; 6997c657876SArnaldo Carvalho de Melo else 7007c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; 7017c657876SArnaldo Carvalho de Melo 7021f2333aeSArnaldo Carvalho de Melo /* Set transmission rate to 1 packet per second */ 7031f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = hctx->ccid3hctx_s; 704c68e64cfSArnaldo Carvalho de Melo hctx->ccid3hctx_t_rto = USEC_PER_SEC; 7057c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 7067c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 7077c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 7087c657876SArnaldo Carvalho de Melo 7097c657876SArnaldo Carvalho de Melo return 0; 7107c657876SArnaldo Carvalho de Melo } 7117c657876SArnaldo Carvalho de Melo 7127c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 7137c657876SArnaldo Carvalho de Melo { 7147c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7157c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 7167c657876SArnaldo Carvalho de Melo 7177c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 7187c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 7197c657876SArnaldo Carvalho de Melo 7207c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 7217c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 7227c657876SArnaldo Carvalho de Melo 7237c657876SArnaldo Carvalho de Melo /* Empty packet history */ 7248c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 7257c657876SArnaldo Carvalho de Melo 7267c657876SArnaldo Carvalho de Melo kfree(dp->dccps_hc_tx_ccid_private); 7277c657876SArnaldo Carvalho de Melo dp->dccps_hc_tx_ccid_private = NULL; 7287c657876SArnaldo Carvalho de Melo } 7297c657876SArnaldo Carvalho de Melo 7307c657876SArnaldo Carvalho de Melo /* 7317c657876SArnaldo Carvalho de Melo * RX Half Connection methods 7327c657876SArnaldo Carvalho de Melo */ 7337c657876SArnaldo Carvalho de Melo 7347c657876SArnaldo Carvalho de Melo /* TFRC receiver states */ 7357c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states { 7367c657876SArnaldo Carvalho de Melo TFRC_RSTATE_NO_DATA = 1, 7377c657876SArnaldo Carvalho de Melo TFRC_RSTATE_DATA, 7387c657876SArnaldo Carvalho de Melo TFRC_RSTATE_TERM = 127, 7397c657876SArnaldo Carvalho de Melo }; 7407c657876SArnaldo Carvalho de Melo 7417c657876SArnaldo Carvalho de Melo #ifdef CCID3_DEBUG 7427c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 7437c657876SArnaldo Carvalho de Melo { 7447c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 7457c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 7467c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 7477c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 7487c657876SArnaldo Carvalho de Melo }; 7497c657876SArnaldo Carvalho de Melo 7507c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 7517c657876SArnaldo Carvalho de Melo } 7527c657876SArnaldo Carvalho de Melo #endif 7537c657876SArnaldo Carvalho de Melo 7541f2333aeSArnaldo Carvalho de Melo static inline void ccid3_hc_rx_set_state(struct sock *sk, 7551f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 7567c657876SArnaldo Carvalho de Melo { 7577c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7587c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 7597c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 7607c657876SArnaldo Carvalho de Melo 7617c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 7621f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 7631f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 7647c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 7657c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 7667c657876SArnaldo Carvalho de Melo } 7677c657876SArnaldo Carvalho de Melo 7687c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 7697c657876SArnaldo Carvalho de Melo { 7707c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7717c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 7728c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 773b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 7747c657876SArnaldo Carvalho de Melo 7757c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 7767c657876SArnaldo Carvalho de Melo 777b6ee3d4aSArnaldo Carvalho de Melo do_gettimeofday(&now); 778b6ee3d4aSArnaldo Carvalho de Melo 7797c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7807c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7817c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7827c657876SArnaldo Carvalho de Melo break; 7837c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: { 784b6ee3d4aSArnaldo Carvalho de Melo const u32 delta = timeval_delta(&now, 785b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 78627ae543eSArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, 78727ae543eSArnaldo Carvalho de Melo delta); 7887c657876SArnaldo Carvalho de Melo } 7897c657876SArnaldo Carvalho de Melo break; 7907c657876SArnaldo Carvalho de Melo default: 7917c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 7927c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); 7937c657876SArnaldo Carvalho de Melo dump_stack(); 7947c657876SArnaldo Carvalho de Melo return; 7957c657876SArnaldo Carvalho de Melo } 7967c657876SArnaldo Carvalho de Melo 7978c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 7987c657876SArnaldo Carvalho de Melo if (packet == NULL) { 7997c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, no data packet in history!\n", 8007c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 8017c657876SArnaldo Carvalho de Melo dump_stack(); 8027c657876SArnaldo Carvalho de Melo return; 8037c657876SArnaldo Carvalho de Melo } 8047c657876SArnaldo Carvalho de Melo 805b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 806c1734376SArnaldo Carvalho de Melo hcrx->ccid3hcrx_last_counter = packet->dccphrx_ccval; 8078c60f3faSArnaldo Carvalho de Melo hcrx->ccid3hcrx_seqno_last_counter = packet->dccphrx_seqno; 8087c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 8097c657876SArnaldo Carvalho de Melo 8107c657876SArnaldo Carvalho de Melo /* Convert to multiples of 10us */ 811b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time = 812b6ee3d4aSArnaldo Carvalho de Melo timeval_delta(&now, &packet->dccphrx_tstamp) / 10; 8137c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 8147c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = ~0; 8157c657876SArnaldo Carvalho de Melo else 8167c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 817507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 8187c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 8197c657876SArnaldo Carvalho de Melo } 8207c657876SArnaldo Carvalho de Melo 8217c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 8227c657876SArnaldo Carvalho de Melo { 8237c657876SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 8244fded33bSArnaldo Carvalho de Melo u32 x_recv, pinv; 8257c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 8267c657876SArnaldo Carvalho de Melo 8271f2333aeSArnaldo Carvalho de Melo if (hcrx == NULL || !(sk->sk_state == DCCP_OPEN || 8281f2333aeSArnaldo Carvalho de Melo sk->sk_state == DCCP_PARTOPEN)) 8297c657876SArnaldo Carvalho de Melo return; 8307c657876SArnaldo Carvalho de Melo 8317c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter; 8324fded33bSArnaldo Carvalho de Melo 8334fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 8344fded33bSArnaldo Carvalho de Melo return; 8354fded33bSArnaldo Carvalho de Melo 8364fded33bSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_elapsed_time != 0) 8374fded33bSArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 8384fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time); 8394fded33bSArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb); 8404fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 8414fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 8424fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 8434fded33bSArnaldo Carvalho de Melo &pinv, sizeof(pinv)); 8444fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 8454fded33bSArnaldo Carvalho de Melo &x_recv, sizeof(x_recv)); 8467c657876SArnaldo Carvalho de Melo } 8477c657876SArnaldo Carvalho de Melo 8487c657876SArnaldo Carvalho de Melo /* calculate first loss interval 8497c657876SArnaldo Carvalho de Melo * 8507c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 8517c657876SArnaldo Carvalho de Melo 8527c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 8537c657876SArnaldo Carvalho de Melo { 8547c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 8557c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 8568c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 8577c657876SArnaldo Carvalho de Melo u32 rtt, delta, x_recv, fval, p, tmp2; 858b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 8597c657876SArnaldo Carvalho de Melo int interval = 0; 8607c657876SArnaldo Carvalho de Melo int win_count = 0; 8617c657876SArnaldo Carvalho de Melo int step = 0; 8627c657876SArnaldo Carvalho de Melo u64 tmp1; 8637c657876SArnaldo Carvalho de Melo 8648c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 8658c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 8668c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 8677c657876SArnaldo Carvalho de Melo tail = entry; 8687c657876SArnaldo Carvalho de Melo 8697c657876SArnaldo Carvalho de Melo switch (step) { 8707c657876SArnaldo Carvalho de Melo case 0: 8718c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 872c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 8737c657876SArnaldo Carvalho de Melo step = 1; 8747c657876SArnaldo Carvalho de Melo break; 8757c657876SArnaldo Carvalho de Melo case 1: 876c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 8777c657876SArnaldo Carvalho de Melo if (interval < 0) 8787c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 8797c657876SArnaldo Carvalho de Melo if (interval > 4) 8807c657876SArnaldo Carvalho de Melo goto found; 8817c657876SArnaldo Carvalho de Melo break; 8827c657876SArnaldo Carvalho de Melo } 8837c657876SArnaldo Carvalho de Melo } 8847c657876SArnaldo Carvalho de Melo } 8857c657876SArnaldo Carvalho de Melo 8867c657876SArnaldo Carvalho de Melo if (step == 0) { 8871f2333aeSArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, packet history contains no " 8881f2333aeSArnaldo Carvalho de Melo "data packets!\n", 8897c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 8907c657876SArnaldo Carvalho de Melo return ~0; 8917c657876SArnaldo Carvalho de Melo } 8927c657876SArnaldo Carvalho de Melo 8937c657876SArnaldo Carvalho de Melo if (interval == 0) { 8941f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Could not find a win_count " 8951f2333aeSArnaldo Carvalho de Melo "interval > 0. Defaulting to 1\n", 8967c657876SArnaldo Carvalho de Melo dccp_role(sk), sk); 8977c657876SArnaldo Carvalho de Melo interval = 1; 8987c657876SArnaldo Carvalho de Melo } 8997c657876SArnaldo Carvalho de Melo found: 900b6ee3d4aSArnaldo Carvalho de Melo rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; 9017c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", 9027c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, rtt); 9037c657876SArnaldo Carvalho de Melo if (rtt == 0) 9047c657876SArnaldo Carvalho de Melo rtt = 1; 9057c657876SArnaldo Carvalho de Melo 906b6ee3d4aSArnaldo Carvalho de Melo delta = timeval_now_delta(&hcrx->ccid3hcrx_tstamp_last_feedback); 907b6ee3d4aSArnaldo Carvalho de Melo x_recv = hcrx->ccid3hcrx_bytes_recv * USEC_PER_SEC; 908b6ee3d4aSArnaldo Carvalho de Melo if (likely(delta > 1)) 909b6ee3d4aSArnaldo Carvalho de Melo x_recv /= delta; 9107c657876SArnaldo Carvalho de Melo 9117c657876SArnaldo Carvalho de Melo tmp1 = (u64)x_recv * (u64)rtt; 9127c657876SArnaldo Carvalho de Melo do_div(tmp1,10000000); 9137c657876SArnaldo Carvalho de Melo tmp2 = (u32)tmp1; 9147c657876SArnaldo Carvalho de Melo fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; 9157c657876SArnaldo Carvalho de Melo /* do not alter order above or you will get overflow on 32 bit */ 91636729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 9171f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " 9181f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 9197c657876SArnaldo Carvalho de Melo 9207c657876SArnaldo Carvalho de Melo if (p == 0) 9217c657876SArnaldo Carvalho de Melo return ~0; 9227c657876SArnaldo Carvalho de Melo else 9237c657876SArnaldo Carvalho de Melo return 1000000 / p; 9247c657876SArnaldo Carvalho de Melo } 9257c657876SArnaldo Carvalho de Melo 9267c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 9277c657876SArnaldo Carvalho de Melo { 9287c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 9297c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 9307c657876SArnaldo Carvalho de Melo 931ae6706f0SArnaldo Carvalho de Melo if (seq_loss != DCCP_MAX_SEQNO + 1 && 932ae6706f0SArnaldo Carvalho de Melo list_empty(&hcrx->ccid3hcrx_li_hist)) { 933ae6706f0SArnaldo Carvalho de Melo struct dccp_li_hist_entry *li_tail; 9347c657876SArnaldo Carvalho de Melo 935ae6706f0SArnaldo Carvalho de Melo li_tail = dccp_li_hist_interval_new(ccid3_li_hist, 936ae6706f0SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 937ae6706f0SArnaldo Carvalho de Melo seq_loss, win_loss); 9387c657876SArnaldo Carvalho de Melo if (li_tail == NULL) 939ae6706f0SArnaldo Carvalho de Melo return; 940ae6706f0SArnaldo Carvalho de Melo li_tail->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 9417c657876SArnaldo Carvalho de Melo } 9427c657876SArnaldo Carvalho de Melo /* FIXME: find end of interval */ 9437c657876SArnaldo Carvalho de Melo } 9447c657876SArnaldo Carvalho de Melo 9457c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_detect_loss(struct sock *sk) 9467c657876SArnaldo Carvalho de Melo { 9477c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 9487c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 94929e4f8b3SArnaldo Carvalho de Melo u8 win_loss; 95029e4f8b3SArnaldo Carvalho de Melo const u64 seq_loss = dccp_rx_hist_detect_loss(&hcrx->ccid3hcrx_hist, 95129e4f8b3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 95229e4f8b3SArnaldo Carvalho de Melo &win_loss); 9537c657876SArnaldo Carvalho de Melo 9547c657876SArnaldo Carvalho de Melo ccid3_hc_rx_update_li(sk, seq_loss, win_loss); 9557c657876SArnaldo Carvalho de Melo } 9567c657876SArnaldo Carvalho de Melo 9577c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9587c657876SArnaldo Carvalho de Melo { 9597c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 9607c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 9614fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9628c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9637c657876SArnaldo Carvalho de Melo struct timeval now; 9647c657876SArnaldo Carvalho de Melo u8 win_count; 9657c657876SArnaldo Carvalho de Melo u32 p_prev; 9667c657876SArnaldo Carvalho de Melo int ins; 9671f2333aeSArnaldo Carvalho de Melo 9687c657876SArnaldo Carvalho de Melo if (hcrx == NULL) 9697c657876SArnaldo Carvalho de Melo return; 9707c657876SArnaldo Carvalho de Melo 9717c657876SArnaldo Carvalho de Melo BUG_ON(!(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA || 9727c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA)); 9737c657876SArnaldo Carvalho de Melo 9744fded33bSArnaldo Carvalho de Melo opt_recv = &dp->dccps_options_received; 9754fded33bSArnaldo Carvalho de Melo 9767c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9777c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9787c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9797c657876SArnaldo Carvalho de Melo return; 9807c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9814fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9827c657876SArnaldo Carvalho de Melo break; 9837c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_rtt; 9847c657876SArnaldo Carvalho de Melo do_gettimeofday(&now); 985b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = timeval_usecs(&now) - 9864fded33bSArnaldo Carvalho de Melo (opt_recv->dccpor_timestamp_echo - 9874fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time) * 10; 9887c657876SArnaldo Carvalho de Melo if (p_prev != hcrx->ccid3hcrx_rtt) 9894fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n", 9904fded33bSArnaldo Carvalho de Melo dccp_role(sk), hcrx->ccid3hcrx_rtt, 9914fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 9927c657876SArnaldo Carvalho de Melo break; 9937c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 9947c657876SArnaldo Carvalho de Melo break; 9957c657876SArnaldo Carvalho de Melo default: 9967c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, not DATA/DATAACK/ACK packet(%s)\n", 9977c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 9987c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 9997c657876SArnaldo Carvalho de Melo return; 10007c657876SArnaldo Carvalho de Melo } 10017c657876SArnaldo Carvalho de Melo 10024fded33bSArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp, 10038c60f3faSArnaldo Carvalho de Melo skb, SLAB_ATOMIC); 10047c657876SArnaldo Carvalho de Melo if (packet == NULL) { 10051f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Not enough mem to add rx packet " 10061f2333aeSArnaldo Carvalho de Melo "to history (consider it lost)!", 10077c657876SArnaldo Carvalho de Melo dccp_role(sk), sk); 10087c657876SArnaldo Carvalho de Melo return; 10097c657876SArnaldo Carvalho de Melo } 10107c657876SArnaldo Carvalho de Melo 1011c1734376SArnaldo Carvalho de Melo win_count = packet->dccphrx_ccval; 10127c657876SArnaldo Carvalho de Melo 1013072ab6c6SArnaldo Carvalho de Melo ins = dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 1014072ab6c6SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, packet); 10157c657876SArnaldo Carvalho de Melo 10167c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 10177c657876SArnaldo Carvalho de Melo return; 10187c657876SArnaldo Carvalho de Melo 10197c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10207c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 10211f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " 10221f2333aeSArnaldo Carvalho de Melo "feedback\n", 10231f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 10241f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10257c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10267c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10277c657876SArnaldo Carvalho de Melo return; 10287c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 10291f2333aeSArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv += skb->len - 10301f2333aeSArnaldo Carvalho de Melo dccp_hdr(skb)->dccph_doff * 4; 1031b6ee3d4aSArnaldo Carvalho de Melo if (ins != 0) 1032b6ee3d4aSArnaldo Carvalho de Melo break; 1033b6ee3d4aSArnaldo Carvalho de Melo 1034b6ee3d4aSArnaldo Carvalho de Melo do_gettimeofday(&now); 1035b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= 10364fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt) { 1037b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10387c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10397c657876SArnaldo Carvalho de Melo } 10407c657876SArnaldo Carvalho de Melo return; 10417c657876SArnaldo Carvalho de Melo default: 10427c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 10437c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); 10447c657876SArnaldo Carvalho de Melo dump_stack(); 10457c657876SArnaldo Carvalho de Melo return; 10467c657876SArnaldo Carvalho de Melo } 10477c657876SArnaldo Carvalho de Melo 10487c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 10494fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", 10504fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10517c657876SArnaldo Carvalho de Melo 10527c657876SArnaldo Carvalho de Melo ccid3_hc_rx_detect_loss(sk); 10537c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10547c657876SArnaldo Carvalho de Melo 10557c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1056ae6706f0SArnaldo Carvalho de Melo if (!list_empty(&hcrx->ccid3hcrx_li_hist)) 10577c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1058ae6706f0SArnaldo Carvalho de Melo hcrx->ccid3hcrx_p = 1000000 / dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 10597c657876SArnaldo Carvalho de Melo 10607c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10617c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10627c657876SArnaldo Carvalho de Melo return; 10637c657876SArnaldo Carvalho de Melo } 10647c657876SArnaldo Carvalho de Melo } 10657c657876SArnaldo Carvalho de Melo 10667c657876SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct sock *sk) 10677c657876SArnaldo Carvalho de Melo { 10687c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 10697c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx; 10707c657876SArnaldo Carvalho de Melo 10717c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10727c657876SArnaldo Carvalho de Melo 10731f2333aeSArnaldo Carvalho de Melo hcrx = dp->dccps_hc_rx_ccid_private = kmalloc(sizeof(*hcrx), 10741f2333aeSArnaldo Carvalho de Melo gfp_any()); 10757c657876SArnaldo Carvalho de Melo if (hcrx == NULL) 10767c657876SArnaldo Carvalho de Melo return -ENOMEM; 10777c657876SArnaldo Carvalho de Melo 10787c657876SArnaldo Carvalho de Melo memset(hcrx, 0, sizeof(*hcrx)); 10797c657876SArnaldo Carvalho de Melo 1080a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 1081a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 1082a84ffe43SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = dp->dccps_packet_size; 10837c657876SArnaldo Carvalho de Melo else 10847c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; 10857c657876SArnaldo Carvalho de Melo 10867c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 10877c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1088ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 10894fded33bSArnaldo Carvalho de Melo /* 10904fded33bSArnaldo Carvalho de Melo * XXX this seems to be paranoid, need to think more about this, for 10914fded33bSArnaldo Carvalho de Melo * now start with something different than zero. -acme 10924fded33bSArnaldo Carvalho de Melo */ 10934fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = USEC_PER_SEC / 5; 10947c657876SArnaldo Carvalho de Melo return 0; 10957c657876SArnaldo Carvalho de Melo } 10967c657876SArnaldo Carvalho de Melo 10977c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 10987c657876SArnaldo Carvalho de Melo { 10997c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 11007c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 11017c657876SArnaldo Carvalho de Melo 11027c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 11037c657876SArnaldo Carvalho de Melo 11047c657876SArnaldo Carvalho de Melo if (hcrx == NULL) 11057c657876SArnaldo Carvalho de Melo return; 11067c657876SArnaldo Carvalho de Melo 11077c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 11087c657876SArnaldo Carvalho de Melo 11097c657876SArnaldo Carvalho de Melo /* Empty packet history */ 11108c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 11117c657876SArnaldo Carvalho de Melo 11127c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1113ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 11147c657876SArnaldo Carvalho de Melo 11157c657876SArnaldo Carvalho de Melo kfree(dp->dccps_hc_rx_ccid_private); 11167c657876SArnaldo Carvalho de Melo dp->dccps_hc_rx_ccid_private = NULL; 11177c657876SArnaldo Carvalho de Melo } 11187c657876SArnaldo Carvalho de Melo 11192babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 11202babe1f6SArnaldo Carvalho de Melo { 11212babe1f6SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 11222babe1f6SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 11232babe1f6SArnaldo Carvalho de Melo 11242babe1f6SArnaldo Carvalho de Melo if (hcrx == NULL) 11252babe1f6SArnaldo Carvalho de Melo return; 11262babe1f6SArnaldo Carvalho de Melo 11272babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11282babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11292babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11302babe1f6SArnaldo Carvalho de Melo } 11312babe1f6SArnaldo Carvalho de Melo 11322babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 11332babe1f6SArnaldo Carvalho de Melo { 11342babe1f6SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 11352babe1f6SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 11362babe1f6SArnaldo Carvalho de Melo 11372babe1f6SArnaldo Carvalho de Melo if (hctx == NULL) 11382babe1f6SArnaldo Carvalho de Melo return; 11392babe1f6SArnaldo Carvalho de Melo 11402babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 11412babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 11422babe1f6SArnaldo Carvalho de Melo } 11432babe1f6SArnaldo Carvalho de Melo 11447c657876SArnaldo Carvalho de Melo static struct ccid ccid3 = { 11457c657876SArnaldo Carvalho de Melo .ccid_id = 3, 11467c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 11477c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 11487c657876SArnaldo Carvalho de Melo .ccid_init = ccid3_init, 11497c657876SArnaldo Carvalho de Melo .ccid_exit = ccid3_exit, 11507c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 11517c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 11527c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 11537c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 11547c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 11557c657876SArnaldo Carvalho de Melo .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, 11567c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 11577c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 11587c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 11597c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 11607c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 11612babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 11622babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 11637c657876SArnaldo Carvalho de Melo }; 11647c657876SArnaldo Carvalho de Melo 11657c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 11667c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 11677c657876SArnaldo Carvalho de Melo 11687c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 11697c657876SArnaldo Carvalho de Melo { 11708c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 11717c657876SArnaldo Carvalho de Melo 11728c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 11738c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 11747c657876SArnaldo Carvalho de Melo goto out; 11757c657876SArnaldo Carvalho de Melo 11768c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 11778c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 11788c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 11797c657876SArnaldo Carvalho de Melo 1180ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1181ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 11828c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 11837c657876SArnaldo Carvalho de Melo 11847c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 11857c657876SArnaldo Carvalho de Melo if (rc != 0) 11867c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 11877c657876SArnaldo Carvalho de Melo out: 11887c657876SArnaldo Carvalho de Melo return rc; 11898c60f3faSArnaldo Carvalho de Melo 11907c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1191ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1192ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 11938c60f3faSArnaldo Carvalho de Melo out_free_tx: 11948c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 11958c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 11968c60f3faSArnaldo Carvalho de Melo out_free_rx: 11978c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 11988c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 11997c657876SArnaldo Carvalho de Melo goto out; 12007c657876SArnaldo Carvalho de Melo } 12017c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 12027c657876SArnaldo Carvalho de Melo 12037c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 12047c657876SArnaldo Carvalho de Melo { 1205725ba8eeSArnaldo Carvalho de Melo #ifdef CONFIG_IP_DCCP_UNLOAD_HACK 1206725ba8eeSArnaldo Carvalho de Melo /* 1207725ba8eeSArnaldo Carvalho de Melo * Hack to use while developing, so that we get rid of the control 1208725ba8eeSArnaldo Carvalho de Melo * sock, that is what keeps a refcount on dccp.ko -acme 1209725ba8eeSArnaldo Carvalho de Melo */ 1210725ba8eeSArnaldo Carvalho de Melo extern void dccp_ctl_sock_exit(void); 1211725ba8eeSArnaldo Carvalho de Melo 1212725ba8eeSArnaldo Carvalho de Melo dccp_ctl_sock_exit(); 1213725ba8eeSArnaldo Carvalho de Melo #endif 12147c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12157c657876SArnaldo Carvalho de Melo 12168c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12178c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12188c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12197c657876SArnaldo Carvalho de Melo } 12208c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12218c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12228c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12237c657876SArnaldo Carvalho de Melo } 1224ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1225ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1226ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12277c657876SArnaldo Carvalho de Melo } 12287c657876SArnaldo Carvalho de Melo } 12297c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12307c657876SArnaldo Carvalho de Melo 12311f2333aeSArnaldo Carvalho de Melo MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz>, " 12321f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12337c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12347c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12357c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1236