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 return 0; 827c657876SArnaldo Carvalho de Melo } 837c657876SArnaldo Carvalho de Melo 847c657876SArnaldo Carvalho de Melo static void ccid3_exit(struct sock *sk) 857c657876SArnaldo Carvalho de Melo { 867c657876SArnaldo Carvalho de Melo } 877c657876SArnaldo Carvalho de Melo 887c657876SArnaldo Carvalho de Melo /* TFRC sender states */ 897c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states { 907c657876SArnaldo Carvalho de Melo TFRC_SSTATE_NO_SENT = 1, 917c657876SArnaldo Carvalho de Melo TFRC_SSTATE_NO_FBACK, 927c657876SArnaldo Carvalho de Melo TFRC_SSTATE_FBACK, 937c657876SArnaldo Carvalho de Melo TFRC_SSTATE_TERM, 947c657876SArnaldo Carvalho de Melo }; 957c657876SArnaldo Carvalho de Melo 967c657876SArnaldo Carvalho de Melo #ifdef CCID3_DEBUG 977c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 987c657876SArnaldo Carvalho de Melo { 997c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 1007c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 1017c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 1027c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 1037c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 1047c657876SArnaldo Carvalho de Melo }; 1057c657876SArnaldo Carvalho de Melo 1067c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 1077c657876SArnaldo Carvalho de Melo } 1087c657876SArnaldo Carvalho de Melo #endif 1097c657876SArnaldo Carvalho de Melo 1101f2333aeSArnaldo Carvalho de Melo static inline void ccid3_hc_tx_set_state(struct sock *sk, 1111f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 1127c657876SArnaldo Carvalho de Melo { 11359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1147c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 1157c657876SArnaldo Carvalho de Melo 1167c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 1171f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 1181f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 1197c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 1207c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 1217c657876SArnaldo Carvalho de Melo } 1227c657876SArnaldo Carvalho de Melo 1237c657876SArnaldo Carvalho de Melo /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ 1247c657876SArnaldo Carvalho de Melo static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx) 1257c657876SArnaldo Carvalho de Melo { 1266b5e633aSArnaldo Carvalho de Melo /* 1276b5e633aSArnaldo Carvalho de Melo * If no feedback spec says t_ipi is 1 second (set elsewhere and then 1286b5e633aSArnaldo Carvalho de Melo * doubles after every no feedback timer (separate function) 1296b5e633aSArnaldo Carvalho de Melo */ 1306b5e633aSArnaldo Carvalho de Melo if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK) 1316b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, 1326b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x); 1337c657876SArnaldo Carvalho de Melo } 1347c657876SArnaldo Carvalho de Melo 1357c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1367c657876SArnaldo Carvalho de Melo static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx) 1377c657876SArnaldo Carvalho de Melo { 1381f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 1391f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1407c657876SArnaldo Carvalho de Melo } 1417c657876SArnaldo Carvalho de Melo 1427c657876SArnaldo Carvalho de Melo /* 1437c657876SArnaldo Carvalho de Melo * Update X by 1447c657876SArnaldo Carvalho de Melo * If (p > 0) 1457c657876SArnaldo Carvalho de Melo * x_calc = calcX(s, R, p); 1467c657876SArnaldo Carvalho de Melo * X = max(min(X_calc, 2 * X_recv), s / t_mbi); 1477c657876SArnaldo Carvalho de Melo * Else 1487c657876SArnaldo Carvalho de Melo * If (now - tld >= R) 1497c657876SArnaldo Carvalho de Melo * X = max(min(2 * X, 2 * X_recv), s / R); 1507c657876SArnaldo Carvalho de Melo * tld = now; 1517c657876SArnaldo Carvalho de Melo */ 1527c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_update_x(struct sock *sk) 1537c657876SArnaldo Carvalho de Melo { 15459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1557c657876SArnaldo Carvalho de Melo 1561f2333aeSArnaldo Carvalho de Melo /* To avoid large error in calcX */ 1571f2333aeSArnaldo Carvalho de Melo if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { 15836729c1aSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, 1597c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, 1607c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p); 1611f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, 1621f2333aeSArnaldo Carvalho de Melo 2 * hctx->ccid3hctx_x_recv), 1631f2333aeSArnaldo Carvalho de Melo (hctx->ccid3hctx_s / 1641f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)); 165b6ee3d4aSArnaldo Carvalho de Melo } else { 166b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 167b6ee3d4aSArnaldo Carvalho de Melo 168b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 169b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= 170b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt) { 1716b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, 1726b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x) * 2, 1736b5e633aSArnaldo Carvalho de Melo usecs_div(hctx->ccid3hctx_s, 1746b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 175b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 176b6ee3d4aSArnaldo Carvalho de Melo } 1777c657876SArnaldo Carvalho de Melo } 1787c657876SArnaldo Carvalho de Melo } 1797c657876SArnaldo Carvalho de Melo 1807c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1817c657876SArnaldo Carvalho de Melo { 1827c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 1837c657876SArnaldo Carvalho de Melo unsigned long next_tmout = 0; 18459725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 1857c657876SArnaldo Carvalho de Melo 1867c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 1877c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 1887c657876SArnaldo Carvalho de Melo /* Try again later. */ 1897c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 1901f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 1911f2333aeSArnaldo Carvalho de Melo jiffies + HZ / 5); 1927c657876SArnaldo Carvalho de Melo goto out; 1937c657876SArnaldo Carvalho de Melo } 1947c657876SArnaldo Carvalho de Melo 1957c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, 1967c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 1977c657876SArnaldo Carvalho de Melo 1987c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 1997c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_TERM: 2007c657876SArnaldo Carvalho de Melo goto out; 2017c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 2027c657876SArnaldo Carvalho de Melo /* Halve send rate */ 2037c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x /= 2; 2046b5e633aSArnaldo Carvalho de Melo if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / 2056b5e633aSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)) 2061f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = (hctx->ccid3hctx_s / 2071f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME); 2087c657876SArnaldo Carvalho de Melo 2091f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " 2101f2333aeSArnaldo Carvalho de Melo "bytes/s\n", 2111f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2121f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2137c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x); 2146b5e633aSArnaldo Carvalho de Melo next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s, 2156b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x), 2161f2333aeSArnaldo Carvalho de Melo TFRC_INITIAL_TIMEOUT); 2171f2333aeSArnaldo Carvalho de Melo /* 2181f2333aeSArnaldo Carvalho de Melo * FIXME - not sure above calculation is correct. See section 2191f2333aeSArnaldo Carvalho de Melo * 5 of CCID3 11 should adjust tx_t_ipi and double that to 2201f2333aeSArnaldo Carvalho de Melo * achieve it really 2211f2333aeSArnaldo Carvalho de Melo */ 2227c657876SArnaldo Carvalho de Melo break; 2237c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2241f2333aeSArnaldo Carvalho de Melo /* 2251f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 2261f2333aeSArnaldo Carvalho de Melo * 4 packets per RTT 2271f2333aeSArnaldo Carvalho de Melo */ 2281f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2296b5e633aSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_recv >= 2306b5e633aSArnaldo Carvalho de Melo 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { 2311f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", 2321f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2337c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2347c657876SArnaldo Carvalho de Melo /* Halve sending rate */ 2357c657876SArnaldo Carvalho de Melo 2367c657876SArnaldo Carvalho de Melo /* If (X_calc > 2 * X_recv) 2377c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2387c657876SArnaldo Carvalho de Melo * Else 2397c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2407c657876SArnaldo Carvalho de Melo */ 2411f2333aeSArnaldo Carvalho de Melo BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && 2421f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc == 0); 2437c657876SArnaldo Carvalho de Melo 2447c657876SArnaldo Carvalho de Melo /* check also if p is zero -> x_calc is infinity? */ 2457c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || 2467c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) 2477c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, 2487c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); 2497c657876SArnaldo Carvalho de Melo else 2507c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; 2517c657876SArnaldo Carvalho de Melo 2527c657876SArnaldo Carvalho de Melo /* Update sending rate */ 2537c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 2547c657876SArnaldo Carvalho de Melo } 2556b5e633aSArnaldo Carvalho de Melo /* 2566b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2576b5e633aSArnaldo Carvalho de Melo * max(4 * R, 2 * s / X) 2586b5e633aSArnaldo Carvalho de Melo */ 259c68e64cfSArnaldo Carvalho de Melo next_tmout = max_t(u32, hctx->ccid3hctx_t_rto, 2606b5e633aSArnaldo Carvalho de Melo 2 * usecs_div(hctx->ccid3hctx_s, 2616b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x)); 2627c657876SArnaldo Carvalho de Melo break; 2637c657876SArnaldo Carvalho de Melo default: 2647c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 2657c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 2667c657876SArnaldo Carvalho de Melo dump_stack(); 2677c657876SArnaldo Carvalho de Melo goto out; 2687c657876SArnaldo Carvalho de Melo } 2697c657876SArnaldo Carvalho de Melo 2707c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2717c657876SArnaldo Carvalho de Melo jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); 2727c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 2737c657876SArnaldo Carvalho de Melo out: 2747c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2757c657876SArnaldo Carvalho de Melo sock_put(sk); 2767c657876SArnaldo Carvalho de Melo } 2777c657876SArnaldo Carvalho de Melo 27827258ee5SArnaldo Carvalho de Melo static int ccid3_hc_tx_send_packet(struct sock *sk, 27927258ee5SArnaldo Carvalho de Melo struct sk_buff *skb, int len) 2807c657876SArnaldo Carvalho de Melo { 2817c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 28259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 2838c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *new_packet; 2847c657876SArnaldo Carvalho de Melo struct timeval now; 28527258ee5SArnaldo Carvalho de Melo long delay; 2867c657876SArnaldo Carvalho de Melo int rc = -ENOTCONN; 2877c657876SArnaldo Carvalho de Melo 28859d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); 2891f2333aeSArnaldo Carvalho de Melo 29059d203f9SArnaldo Carvalho de Melo /* Check if pure ACK or Terminating*/ 2917c657876SArnaldo Carvalho de Melo /* 2921f2333aeSArnaldo Carvalho de Melo * XXX: We only call this function for DATA and DATAACK, on, these 2931f2333aeSArnaldo Carvalho de Melo * packets can have zero length, but why the comment about "pure ACK"? 2947c657876SArnaldo Carvalho de Melo */ 29559d203f9SArnaldo Carvalho de Melo if (unlikely(len == 0)) 2967c657876SArnaldo Carvalho de Melo goto out; 2977c657876SArnaldo Carvalho de Melo 2987c657876SArnaldo Carvalho de Melo /* See if last packet allocated was not sent */ 2998c60f3faSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 3008c60f3faSArnaldo Carvalho de Melo if (new_packet == NULL || new_packet->dccphtx_sent) { 3011f2333aeSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, 3021f2333aeSArnaldo Carvalho de Melo SLAB_ATOMIC); 3037c657876SArnaldo Carvalho de Melo 3047c657876SArnaldo Carvalho de Melo rc = -ENOBUFS; 30559d203f9SArnaldo Carvalho de Melo if (unlikely(new_packet == NULL)) { 30659d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, not enough " 30759d203f9SArnaldo Carvalho de Melo "mem to add to history, send refused\n", 30859d203f9SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 3097c657876SArnaldo Carvalho de Melo goto out; 3107c657876SArnaldo Carvalho de Melo } 3117c657876SArnaldo Carvalho de Melo 3128c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); 3137c657876SArnaldo Carvalho de Melo } 3147c657876SArnaldo Carvalho de Melo 315b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3167c657876SArnaldo Carvalho de Melo 3177c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3187c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3197c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; 3207c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 3211f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3221f2333aeSArnaldo Carvalho de Melo jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); 3237c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3247c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3257c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 326d7e0fb98SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi = TFRC_INITIAL_IPI; 3277c657876SArnaldo Carvalho de Melo 3287c657876SArnaldo Carvalho de Melo /* Set nominal send time for initial packet */ 3297c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 330b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 331b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 3327c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 3337c657876SArnaldo Carvalho de Melo rc = 0; 3347c657876SArnaldo Carvalho de Melo break; 3357c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3367c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 337b6ee3d4aSArnaldo Carvalho de Melo delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) - 338b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_delta); 33927258ee5SArnaldo Carvalho de Melo delay /= -1000; 3407c657876SArnaldo Carvalho de Melo /* divide by -1000 is to convert to ms and get sign right */ 341d6809c12SArnaldo Carvalho de Melo rc = delay > 0 ? delay : 0; 3427c657876SArnaldo Carvalho de Melo break; 3437c657876SArnaldo Carvalho de Melo default: 3447c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 3457c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 3467c657876SArnaldo Carvalho de Melo dump_stack(); 3477c657876SArnaldo Carvalho de Melo rc = -EINVAL; 3487c657876SArnaldo Carvalho de Melo break; 3497c657876SArnaldo Carvalho de Melo } 3507c657876SArnaldo Carvalho de Melo 3517c657876SArnaldo Carvalho de Melo /* Can we send? if so add options and add to packet history */ 352507d37cfSArnaldo Carvalho de Melo if (rc == 0) { 353507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 1; 354c1734376SArnaldo Carvalho de Melo new_packet->dccphtx_ccval = 3558c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = 3568c60f3faSArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count; 357507d37cfSArnaldo Carvalho de Melo } 3587c657876SArnaldo Carvalho de Melo out: 3597c657876SArnaldo Carvalho de Melo return rc; 3607c657876SArnaldo Carvalho de Melo } 3617c657876SArnaldo Carvalho de Melo 3627c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) 3637c657876SArnaldo Carvalho de Melo { 36459725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 36559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 3667c657876SArnaldo Carvalho de Melo struct timeval now; 3677c657876SArnaldo Carvalho de Melo 36859d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); 3697c657876SArnaldo Carvalho de Melo 370b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 3717c657876SArnaldo Carvalho de Melo 3727c657876SArnaldo Carvalho de Melo /* check if we have sent a data packet */ 3737c657876SArnaldo Carvalho de Melo if (len > 0) { 3747c657876SArnaldo Carvalho de Melo unsigned long quarter_rtt; 3758c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 3767c657876SArnaldo Carvalho de Melo 3778c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 37859d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 37959d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: packet doesn't " 38059d203f9SArnaldo Carvalho de Melo "exists in history!\n", __FUNCTION__); 3817c657876SArnaldo Carvalho de Melo return; 3827c657876SArnaldo Carvalho de Melo } 38359d203f9SArnaldo Carvalho de Melo if (unlikely(packet->dccphtx_sent)) { 38459d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: no unsent packet in " 38559d203f9SArnaldo Carvalho de Melo "history!\n", __FUNCTION__); 3867c657876SArnaldo Carvalho de Melo return; 3877c657876SArnaldo Carvalho de Melo } 3888c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 3898c60f3faSArnaldo Carvalho de Melo packet->dccphtx_seqno = dp->dccps_gss; 3907c657876SArnaldo Carvalho de Melo /* 3911f2333aeSArnaldo Carvalho de Melo * Check if win_count have changed 3921f2333aeSArnaldo Carvalho de Melo * Algorithm in "8.1. Window Counter Valuer" in 3931f2333aeSArnaldo Carvalho de Melo * draft-ietf-dccp-ccid3-11.txt 3947c657876SArnaldo Carvalho de Melo */ 3956b5e633aSArnaldo Carvalho de Melo quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); 3966b5e633aSArnaldo Carvalho de Melo if (likely(hctx->ccid3hctx_rtt > 8)) 3976b5e633aSArnaldo Carvalho de Melo quarter_rtt /= hctx->ccid3hctx_rtt / 4; 3986b5e633aSArnaldo Carvalho de Melo 3997c657876SArnaldo Carvalho de Melo if (quarter_rtt > 0) { 4007c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 4017c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + 4027c657876SArnaldo Carvalho de Melo min_t(unsigned long, quarter_rtt, 5)) % 16; 4031f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, window changed from " 4041f2333aeSArnaldo Carvalho de Melo "%u to %u!\n", 4057c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 406c1734376SArnaldo Carvalho de Melo packet->dccphtx_ccval, 4077c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count); 4087c657876SArnaldo Carvalho de Melo } 4091f2333aeSArnaldo Carvalho de Melo 4107c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 0; 411c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 4128c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 4137c657876SArnaldo Carvalho de Melo } else 4147c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", 4157c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, dp->dccps_gss); 4167c657876SArnaldo Carvalho de Melo 4177c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4187c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 4197c657876SArnaldo Carvalho de Melo /* if first wasn't pure ack */ 4207c657876SArnaldo Carvalho de Melo if (len != 0) 4211f2333aeSArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, First packet sent is noted " 4221f2333aeSArnaldo Carvalho de Melo "as a data packet\n", 4237c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk)); 4247c657876SArnaldo Carvalho de Melo return; 4257c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4267c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4277c657876SArnaldo Carvalho de Melo if (len > 0) { 4287c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 4297c657876SArnaldo Carvalho de Melo ccid3_calc_new_t_ipi(hctx); 4307c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 431b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 432b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 4337c657876SArnaldo Carvalho de Melo } 4347c657876SArnaldo Carvalho de Melo break; 4357c657876SArnaldo Carvalho de Melo default: 4367c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 4377c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 4387c657876SArnaldo Carvalho de Melo dump_stack(); 4397c657876SArnaldo Carvalho de Melo break; 4407c657876SArnaldo Carvalho de Melo } 4417c657876SArnaldo Carvalho de Melo } 4427c657876SArnaldo Carvalho de Melo 4437c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4447c657876SArnaldo Carvalho de Melo { 44559725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 44659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 4477c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4488c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 449b0e56780SArnaldo Carvalho de Melo struct timeval now; 4507c657876SArnaldo Carvalho de Melo unsigned long next_tmout; 4511bc09869SIan McDonald u32 t_elapsed; 4527c657876SArnaldo Carvalho de Melo u32 pinv; 4537c657876SArnaldo Carvalho de Melo u32 x_recv; 4547c657876SArnaldo Carvalho de Melo u32 r_sample; 4551f2333aeSArnaldo Carvalho de Melo 45659d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); 4577c657876SArnaldo Carvalho de Melo 4587c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4597c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4607c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4617c657876SArnaldo Carvalho de Melo return; 4627c657876SArnaldo Carvalho de Melo 4637c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4647c657876SArnaldo Carvalho de Melo 4651a28599aSArnaldo Carvalho de Melo t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10; 4667c657876SArnaldo Carvalho de Melo x_recv = opt_recv->ccid3or_receive_rate; 4677c657876SArnaldo Carvalho de Melo pinv = opt_recv->ccid3or_loss_event_rate; 4687c657876SArnaldo Carvalho de Melo 4697c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4707c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 4717c657876SArnaldo Carvalho de Melo /* FIXME: what to do here? */ 4727c657876SArnaldo Carvalho de Melo return; 4737c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4747c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4757c657876SArnaldo Carvalho de Melo /* Calculate new round trip sample by 4767c657876SArnaldo Carvalho de Melo * R_sample = (now - t_recvdata) - t_delay */ 4777c657876SArnaldo Carvalho de Melo /* get t_recvdata from history */ 4788c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4798c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 48059d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 48159d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, seqno " 48259d203f9SArnaldo Carvalho de Melo "%llu(%s) does't exist in history!\n", 48359d203f9SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, 48459d203f9SArnaldo Carvalho de Melo (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, 4857c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4867c657876SArnaldo Carvalho de Melo return; 4877c657876SArnaldo Carvalho de Melo } 4887c657876SArnaldo Carvalho de Melo 4897c657876SArnaldo Carvalho de Melo /* Update RTT */ 490b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 491b0e56780SArnaldo Carvalho de Melo r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); 4921a28599aSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 49359d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, " 49459d203f9SArnaldo Carvalho de Melo "t_elapsed=%uus\n", 4951a28599aSArnaldo Carvalho de Melo __FUNCTION__, r_sample, t_elapsed); 4961a28599aSArnaldo Carvalho de Melo else 4971a28599aSArnaldo Carvalho de Melo r_sample -= t_elapsed; 4987c657876SArnaldo Carvalho de Melo 4997c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 5007c657876SArnaldo Carvalho de Melo * If (No feedback recv) 5017c657876SArnaldo Carvalho de Melo * R = R_sample; 5027c657876SArnaldo Carvalho de Melo * Else 5037c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 5047c657876SArnaldo Carvalho de Melo * 5057c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 5067c657876SArnaldo Carvalho de Melo */ 5077c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 5087c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 5097c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 5107c657876SArnaldo Carvalho de Melo } else 5111f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + 5121f2333aeSArnaldo Carvalho de Melo r_sample / 10; 5137c657876SArnaldo Carvalho de Melo 5141f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " 5151f2333aeSArnaldo Carvalho de Melo "r_sample=%us\n", dccp_role(sk), sk, 5161f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, r_sample); 5177c657876SArnaldo Carvalho de Melo 5187c657876SArnaldo Carvalho de Melo /* Update timeout interval */ 519c68e64cfSArnaldo Carvalho de Melo hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 520cef07fd6SArnaldo Carvalho de Melo USEC_PER_SEC); 5217c657876SArnaldo Carvalho de Melo 5227c657876SArnaldo Carvalho de Melo /* Update receive rate */ 5231f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ 5247c657876SArnaldo Carvalho de Melo 5257c657876SArnaldo Carvalho de Melo /* Update loss event rate */ 5267c657876SArnaldo Carvalho de Melo if (pinv == ~0 || pinv == 0) 5277c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 0; 5287c657876SArnaldo Carvalho de Melo else { 5297c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 1000000 / pinv; 5307c657876SArnaldo Carvalho de Melo 5317c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { 5327c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = TFRC_SMALLEST_P; 5331f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", 5341f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk); 5357c657876SArnaldo Carvalho de Melo } 5367c657876SArnaldo Carvalho de Melo } 5377c657876SArnaldo Carvalho de Melo 5387c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5397c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5407c657876SArnaldo Carvalho de Melo 5417c657876SArnaldo Carvalho de Melo /* Update sending rate */ 5427c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 5437c657876SArnaldo Carvalho de Melo 5447c657876SArnaldo Carvalho de Melo /* Update next send time */ 545b6ee3d4aSArnaldo Carvalho de Melo timeval_sub_usecs(&hctx->ccid3hctx_t_nom, 546b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 5477c657876SArnaldo Carvalho de Melo ccid3_calc_new_t_ipi(hctx); 548b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 549b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 5507c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 5517c657876SArnaldo Carvalho de Melo 5527c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5538c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5548c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 555c530cfb1SArnaldo Carvalho de Melo /* 556c530cfb1SArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible that 557c530cfb1SArnaldo Carvalho de Melo * we now can send a packet, so wake up dccp_wait_for_ccids. 558c530cfb1SArnaldo Carvalho de Melo */ 559c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5608c60f3faSArnaldo Carvalho de Melo 5611f2333aeSArnaldo Carvalho de Melo /* 5621f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5631f2333aeSArnaldo Carvalho de Melo * max(4 * R, 2 * s / X) 5641f2333aeSArnaldo Carvalho de Melo */ 565c68e64cfSArnaldo Carvalho de Melo next_tmout = max(hctx->ccid3hctx_t_rto, 5666b5e633aSArnaldo Carvalho de Melo 2 * usecs_div(hctx->ccid3hctx_s, 5676b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x)); 5687c657876SArnaldo Carvalho de Melo 5691f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " 5701f2333aeSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5711f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5721f2333aeSArnaldo Carvalho de Melo usecs_to_jiffies(next_tmout), next_tmout); 5737c657876SArnaldo Carvalho de Melo 5747c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5757c657876SArnaldo Carvalho de Melo jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); 5767c657876SArnaldo Carvalho de Melo 5777c657876SArnaldo Carvalho de Melo /* set idle flag */ 5787c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5797c657876SArnaldo Carvalho de Melo break; 5807c657876SArnaldo Carvalho de Melo default: 5817c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 5827c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 5837c657876SArnaldo Carvalho de Melo dump_stack(); 5847c657876SArnaldo Carvalho de Melo break; 5857c657876SArnaldo Carvalho de Melo } 5867c657876SArnaldo Carvalho de Melo } 5877c657876SArnaldo Carvalho de Melo 5887c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) 5897c657876SArnaldo Carvalho de Melo { 59059d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 5917c657876SArnaldo Carvalho de Melo 59259d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 59359d203f9SArnaldo Carvalho de Melo 59459d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 5957c657876SArnaldo Carvalho de Melo return; 5967c657876SArnaldo Carvalho de Melo 5977c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 5987c657876SArnaldo Carvalho de Melo } 5997c657876SArnaldo Carvalho de Melo 6007c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 6011f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 6021f2333aeSArnaldo Carvalho de Melo unsigned char *value) 6037c657876SArnaldo Carvalho de Melo { 6047c657876SArnaldo Carvalho de Melo int rc = 0; 60559725dc2SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 60659725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6077c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 6087c657876SArnaldo Carvalho de Melo 60959d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6107c657876SArnaldo Carvalho de Melo 6117c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 6127c657876SArnaldo Carvalho de Melo 6137c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 6147c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 6157c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 6167c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 6177c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 6187c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 6197c657876SArnaldo Carvalho de Melo } 6207c657876SArnaldo Carvalho de Melo 6217c657876SArnaldo Carvalho de Melo switch (option) { 6227c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 62359d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 62459d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid " 62559d203f9SArnaldo Carvalho de Melo "len for TFRC_OPT_LOSS_EVENT_RATE\n", 62659d203f9SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 6277c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6287c657876SArnaldo Carvalho de Melo } else { 6297c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ntohl(*(u32 *)value); 6307c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", 6317c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6327c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 6337c657876SArnaldo Carvalho de Melo } 6347c657876SArnaldo Carvalho de Melo break; 6357c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 6367c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 6377c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 6387c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", 6397c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6407c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 6417c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 6427c657876SArnaldo Carvalho de Melo break; 6437c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 64459d203f9SArnaldo Carvalho de Melo if (unlikely(len != 4)) { 64559d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid " 64659d203f9SArnaldo Carvalho de Melo "len for TFRC_OPT_RECEIVE_RATE\n", 64759d203f9SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 6487c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6497c657876SArnaldo Carvalho de Melo } else { 6507c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = ntohl(*(u32 *)value); 6517c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", 6527c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6537c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6547c657876SArnaldo Carvalho de Melo } 6557c657876SArnaldo Carvalho de Melo break; 6567c657876SArnaldo Carvalho de Melo } 6577c657876SArnaldo Carvalho de Melo 6587c657876SArnaldo Carvalho de Melo return rc; 6597c657876SArnaldo Carvalho de Melo } 6607c657876SArnaldo Carvalho de Melo 6617c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct sock *sk) 6627c657876SArnaldo Carvalho de Melo { 6637c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6647c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx; 6657c657876SArnaldo Carvalho de Melo 66659725dc2SArnaldo Carvalho de Melo dp->dccps_hc_tx_ccid_private = kmalloc(sizeof(*hctx), gfp_any()); 66759725dc2SArnaldo Carvalho de Melo if (dp->dccps_hc_tx_ccid_private == NULL) 6687c657876SArnaldo Carvalho de Melo return -ENOMEM; 6697c657876SArnaldo Carvalho de Melo 67059725dc2SArnaldo Carvalho de Melo hctx = ccid3_hc_tx_sk(sk); 6717c657876SArnaldo Carvalho de Melo memset(hctx, 0, sizeof(*hctx)); 6727c657876SArnaldo Carvalho de Melo 673a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 674a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 675a84ffe43SArnaldo Carvalho de Melo hctx->ccid3hctx_s = dp->dccps_packet_size; 6767c657876SArnaldo Carvalho de Melo else 6777c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; 6787c657876SArnaldo Carvalho de Melo 6791f2333aeSArnaldo Carvalho de Melo /* Set transmission rate to 1 packet per second */ 6801f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = hctx->ccid3hctx_s; 681c68e64cfSArnaldo Carvalho de Melo hctx->ccid3hctx_t_rto = USEC_PER_SEC; 6827c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6837c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 6847c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6857c657876SArnaldo Carvalho de Melo 6867c657876SArnaldo Carvalho de Melo return 0; 6877c657876SArnaldo Carvalho de Melo } 6887c657876SArnaldo Carvalho de Melo 6897c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6907c657876SArnaldo Carvalho de Melo { 6917c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 69259725dc2SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 6937c657876SArnaldo Carvalho de Melo 6947c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 6957c657876SArnaldo Carvalho de Melo 6967c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 6977c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 6987c657876SArnaldo Carvalho de Melo 6997c657876SArnaldo Carvalho de Melo /* Empty packet history */ 7008c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 7017c657876SArnaldo Carvalho de Melo 7027c657876SArnaldo Carvalho de Melo kfree(dp->dccps_hc_tx_ccid_private); 7037c657876SArnaldo Carvalho de Melo dp->dccps_hc_tx_ccid_private = NULL; 7047c657876SArnaldo Carvalho de Melo } 7057c657876SArnaldo Carvalho de Melo 7067c657876SArnaldo Carvalho de Melo /* 7077c657876SArnaldo Carvalho de Melo * RX Half Connection methods 7087c657876SArnaldo Carvalho de Melo */ 7097c657876SArnaldo Carvalho de Melo 7107c657876SArnaldo Carvalho de Melo /* TFRC receiver states */ 7117c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states { 7127c657876SArnaldo Carvalho de Melo TFRC_RSTATE_NO_DATA = 1, 7137c657876SArnaldo Carvalho de Melo TFRC_RSTATE_DATA, 7147c657876SArnaldo Carvalho de Melo TFRC_RSTATE_TERM = 127, 7157c657876SArnaldo Carvalho de Melo }; 7167c657876SArnaldo Carvalho de Melo 7177c657876SArnaldo Carvalho de Melo #ifdef CCID3_DEBUG 7187c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 7197c657876SArnaldo Carvalho de Melo { 7207c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 7217c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 7227c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 7237c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 7247c657876SArnaldo Carvalho de Melo }; 7257c657876SArnaldo Carvalho de Melo 7267c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 7277c657876SArnaldo Carvalho de Melo } 7287c657876SArnaldo Carvalho de Melo #endif 7297c657876SArnaldo Carvalho de Melo 7301f2333aeSArnaldo Carvalho de Melo static inline void ccid3_hc_rx_set_state(struct sock *sk, 7311f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 7327c657876SArnaldo Carvalho de Melo { 73359725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7347c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 7357c657876SArnaldo Carvalho de Melo 7367c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 7371f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 7381f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 7397c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 7407c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 7417c657876SArnaldo Carvalho de Melo } 7427c657876SArnaldo Carvalho de Melo 7437c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 7447c657876SArnaldo Carvalho de Melo { 74559725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7467c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7478c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 748b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 7497c657876SArnaldo Carvalho de Melo 7507c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 7517c657876SArnaldo Carvalho de Melo 752b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 753b6ee3d4aSArnaldo Carvalho de Melo 7547c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7557c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7567c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7577c657876SArnaldo Carvalho de Melo break; 7587c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: { 759b6ee3d4aSArnaldo Carvalho de Melo const u32 delta = timeval_delta(&now, 760b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 76127ae543eSArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, 76227ae543eSArnaldo Carvalho de Melo delta); 7637c657876SArnaldo Carvalho de Melo } 7647c657876SArnaldo Carvalho de Melo break; 7657c657876SArnaldo Carvalho de Melo default: 7667c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 7677c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); 7687c657876SArnaldo Carvalho de Melo dump_stack(); 7697c657876SArnaldo Carvalho de Melo return; 7707c657876SArnaldo Carvalho de Melo } 7717c657876SArnaldo Carvalho de Melo 7728c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 77359d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 77459d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, no data packet " 77559d203f9SArnaldo Carvalho de Melo "in history!\n", 7767c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 7777c657876SArnaldo Carvalho de Melo return; 7787c657876SArnaldo Carvalho de Melo } 7797c657876SArnaldo Carvalho de Melo 780b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 781c1734376SArnaldo Carvalho de Melo hcrx->ccid3hcrx_last_counter = packet->dccphrx_ccval; 7828c60f3faSArnaldo Carvalho de Melo hcrx->ccid3hcrx_seqno_last_counter = packet->dccphrx_seqno; 7837c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7847c657876SArnaldo Carvalho de Melo 7857c657876SArnaldo Carvalho de Melo /* Convert to multiples of 10us */ 786b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time = 787b6ee3d4aSArnaldo Carvalho de Melo timeval_delta(&now, &packet->dccphrx_tstamp) / 10; 7887c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 7897c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = ~0; 7907c657876SArnaldo Carvalho de Melo else 7917c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 792507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 1; 7937c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 7947c657876SArnaldo Carvalho de Melo } 7957c657876SArnaldo Carvalho de Melo 7967c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 7977c657876SArnaldo Carvalho de Melo { 79859d203f9SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 7994fded33bSArnaldo Carvalho de Melo u32 x_recv, pinv; 8007c657876SArnaldo Carvalho de Melo 80159d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 80259d203f9SArnaldo Carvalho de Melo 80359d203f9SArnaldo Carvalho de Melo if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) 8047c657876SArnaldo Carvalho de Melo return; 8057c657876SArnaldo Carvalho de Melo 8067c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter; 8074fded33bSArnaldo Carvalho de Melo 8084fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 8094fded33bSArnaldo Carvalho de Melo return; 8104fded33bSArnaldo Carvalho de Melo 8114fded33bSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_elapsed_time != 0) 8124fded33bSArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 8134fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time); 8144fded33bSArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb); 8154fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 8164fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 8174fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 8184fded33bSArnaldo Carvalho de Melo &pinv, sizeof(pinv)); 8194fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 8204fded33bSArnaldo Carvalho de Melo &x_recv, sizeof(x_recv)); 8217c657876SArnaldo Carvalho de Melo } 8227c657876SArnaldo Carvalho de Melo 8237c657876SArnaldo Carvalho de Melo /* calculate first loss interval 8247c657876SArnaldo Carvalho de Melo * 8257c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 8267c657876SArnaldo Carvalho de Melo 8277c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 8287c657876SArnaldo Carvalho de Melo { 82959725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 8308c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 8317c657876SArnaldo Carvalho de Melo u32 rtt, delta, x_recv, fval, p, tmp2; 832b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 8337c657876SArnaldo Carvalho de Melo int interval = 0; 8347c657876SArnaldo Carvalho de Melo int win_count = 0; 8357c657876SArnaldo Carvalho de Melo int step = 0; 8367c657876SArnaldo Carvalho de Melo u64 tmp1; 8377c657876SArnaldo Carvalho de Melo 8388c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 8398c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 8408c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 8417c657876SArnaldo Carvalho de Melo tail = entry; 8427c657876SArnaldo Carvalho de Melo 8437c657876SArnaldo Carvalho de Melo switch (step) { 8447c657876SArnaldo Carvalho de Melo case 0: 8458c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 846c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 8477c657876SArnaldo Carvalho de Melo step = 1; 8487c657876SArnaldo Carvalho de Melo break; 8497c657876SArnaldo Carvalho de Melo case 1: 850c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 8517c657876SArnaldo Carvalho de Melo if (interval < 0) 8527c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 8537c657876SArnaldo Carvalho de Melo if (interval > 4) 8547c657876SArnaldo Carvalho de Melo goto found; 8557c657876SArnaldo Carvalho de Melo break; 8567c657876SArnaldo Carvalho de Melo } 8577c657876SArnaldo Carvalho de Melo } 8587c657876SArnaldo Carvalho de Melo } 8597c657876SArnaldo Carvalho de Melo 86059d203f9SArnaldo Carvalho de Melo if (unlikely(step == 0)) { 86159d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, packet history " 86259d203f9SArnaldo Carvalho de Melo "contains no data packets!\n", 8637c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 8647c657876SArnaldo Carvalho de Melo return ~0; 8657c657876SArnaldo Carvalho de Melo } 8667c657876SArnaldo Carvalho de Melo 86759d203f9SArnaldo Carvalho de Melo if (unlikely(interval == 0)) { 86859d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Could not find a " 86959d203f9SArnaldo Carvalho de Melo "win_count interval > 0. Defaulting to 1\n", 87059d203f9SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 8717c657876SArnaldo Carvalho de Melo interval = 1; 8727c657876SArnaldo Carvalho de Melo } 8737c657876SArnaldo Carvalho de Melo found: 874b6ee3d4aSArnaldo Carvalho de Melo rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; 8757c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", 8767c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, rtt); 8777c657876SArnaldo Carvalho de Melo if (rtt == 0) 8787c657876SArnaldo Carvalho de Melo rtt = 1; 8797c657876SArnaldo Carvalho de Melo 880b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tstamp); 881b0e56780SArnaldo Carvalho de Melo delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); 882b0e56780SArnaldo Carvalho de Melo x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta); 8837c657876SArnaldo Carvalho de Melo 8847c657876SArnaldo Carvalho de Melo tmp1 = (u64)x_recv * (u64)rtt; 8857c657876SArnaldo Carvalho de Melo do_div(tmp1,10000000); 8867c657876SArnaldo Carvalho de Melo tmp2 = (u32)tmp1; 8877c657876SArnaldo Carvalho de Melo fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; 8887c657876SArnaldo Carvalho de Melo /* do not alter order above or you will get overflow on 32 bit */ 88936729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 8901f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " 8911f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 8927c657876SArnaldo Carvalho de Melo 8937c657876SArnaldo Carvalho de Melo if (p == 0) 8947c657876SArnaldo Carvalho de Melo return ~0; 8957c657876SArnaldo Carvalho de Melo else 8967c657876SArnaldo Carvalho de Melo return 1000000 / p; 8977c657876SArnaldo Carvalho de Melo } 8987c657876SArnaldo Carvalho de Melo 8997c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 9007c657876SArnaldo Carvalho de Melo { 90159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9027c657876SArnaldo Carvalho de Melo 903ae6706f0SArnaldo Carvalho de Melo if (seq_loss != DCCP_MAX_SEQNO + 1 && 904ae6706f0SArnaldo Carvalho de Melo list_empty(&hcrx->ccid3hcrx_li_hist)) { 905ae6706f0SArnaldo Carvalho de Melo struct dccp_li_hist_entry *li_tail; 9067c657876SArnaldo Carvalho de Melo 907ae6706f0SArnaldo Carvalho de Melo li_tail = dccp_li_hist_interval_new(ccid3_li_hist, 908ae6706f0SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 909ae6706f0SArnaldo Carvalho de Melo seq_loss, win_loss); 9107c657876SArnaldo Carvalho de Melo if (li_tail == NULL) 911ae6706f0SArnaldo Carvalho de Melo return; 912ae6706f0SArnaldo Carvalho de Melo li_tail->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 91359d203f9SArnaldo Carvalho de Melo } else 91459d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: FIXME: find end of " 91559d203f9SArnaldo Carvalho de Melo "interval\n", __FUNCTION__); 9167c657876SArnaldo Carvalho de Melo } 9177c657876SArnaldo Carvalho de Melo 9187c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_detect_loss(struct sock *sk) 9197c657876SArnaldo Carvalho de Melo { 92059725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 92129e4f8b3SArnaldo Carvalho de Melo u8 win_loss; 92229e4f8b3SArnaldo Carvalho de Melo const u64 seq_loss = dccp_rx_hist_detect_loss(&hcrx->ccid3hcrx_hist, 92329e4f8b3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 92429e4f8b3SArnaldo Carvalho de Melo &win_loss); 9257c657876SArnaldo Carvalho de Melo 9267c657876SArnaldo Carvalho de Melo ccid3_hc_rx_update_li(sk, seq_loss, win_loss); 9277c657876SArnaldo Carvalho de Melo } 9287c657876SArnaldo Carvalho de Melo 9297c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9307c657876SArnaldo Carvalho de Melo { 93159725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 9324fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9338c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9347c657876SArnaldo Carvalho de Melo struct timeval now; 9357c657876SArnaldo Carvalho de Melo u8 win_count; 936b3a3077dSArnaldo Carvalho de Melo u32 p_prev, r_sample, t_elapsed; 9377c657876SArnaldo Carvalho de Melo int ins; 9381f2333aeSArnaldo Carvalho de Melo 93959d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL || 94059d203f9SArnaldo Carvalho de Melo !(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA || 9417c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA)); 9427c657876SArnaldo Carvalho de Melo 94359725dc2SArnaldo Carvalho de Melo opt_recv = &dccp_sk(sk)->dccps_options_received; 9444fded33bSArnaldo Carvalho de Melo 9457c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9467c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9477c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9487c657876SArnaldo Carvalho de Melo return; 9497c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9504fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9517c657876SArnaldo Carvalho de Melo break; 9527c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_rtt; 953b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 954b3a3077dSArnaldo Carvalho de Melo timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10); 955b3a3077dSArnaldo Carvalho de Melo r_sample = timeval_usecs(&now); 956b3a3077dSArnaldo Carvalho de Melo t_elapsed = opt_recv->dccpor_elapsed_time * 10; 957b3a3077dSArnaldo Carvalho de Melo 958b3a3077dSArnaldo Carvalho de Melo if (unlikely(r_sample <= t_elapsed)) 95959d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, " 96059d203f9SArnaldo Carvalho de Melo "t_elapsed=%uus\n", 961b3a3077dSArnaldo Carvalho de Melo __FUNCTION__, r_sample, t_elapsed); 962b3a3077dSArnaldo Carvalho de Melo else 963b3a3077dSArnaldo Carvalho de Melo r_sample -= t_elapsed; 964b3a3077dSArnaldo Carvalho de Melo 965b3a3077dSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 966b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = r_sample; 967b3a3077dSArnaldo Carvalho de Melo else 968b3a3077dSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 + 969b3a3077dSArnaldo Carvalho de Melo r_sample / 10; 970b3a3077dSArnaldo Carvalho de Melo 9717c657876SArnaldo Carvalho de Melo if (p_prev != hcrx->ccid3hcrx_rtt) 9724fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n", 9734fded33bSArnaldo Carvalho de Melo dccp_role(sk), hcrx->ccid3hcrx_rtt, 9744fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 9757c657876SArnaldo Carvalho de Melo break; 9767c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 9777c657876SArnaldo Carvalho de Melo break; 97859d203f9SArnaldo Carvalho de Melo default: /* We're not interested in other packet types, move along */ 9797c657876SArnaldo Carvalho de Melo return; 9807c657876SArnaldo Carvalho de Melo } 9817c657876SArnaldo Carvalho de Melo 982b0e56780SArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, 9838c60f3faSArnaldo Carvalho de Melo skb, SLAB_ATOMIC); 98459d203f9SArnaldo Carvalho de Melo if (unlikely(packet == NULL)) { 98559d203f9SArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Not enough mem to " 98659d203f9SArnaldo Carvalho de Melo "add rx packet to history, consider it lost!\n", 98759d203f9SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 9887c657876SArnaldo Carvalho de Melo return; 9897c657876SArnaldo Carvalho de Melo } 9907c657876SArnaldo Carvalho de Melo 991c1734376SArnaldo Carvalho de Melo win_count = packet->dccphrx_ccval; 9927c657876SArnaldo Carvalho de Melo 993072ab6c6SArnaldo Carvalho de Melo ins = dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 994072ab6c6SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, packet); 9957c657876SArnaldo Carvalho de Melo 9967c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 9977c657876SArnaldo Carvalho de Melo return; 9987c657876SArnaldo Carvalho de Melo 9997c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10007c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 10011f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " 10021f2333aeSArnaldo Carvalho de Melo "feedback\n", 10031f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 10041f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10057c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10067c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10077c657876SArnaldo Carvalho de Melo return; 10087c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 10091f2333aeSArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv += skb->len - 10101f2333aeSArnaldo Carvalho de Melo dccp_hdr(skb)->dccph_doff * 4; 1011b6ee3d4aSArnaldo Carvalho de Melo if (ins != 0) 1012b6ee3d4aSArnaldo Carvalho de Melo break; 1013b6ee3d4aSArnaldo Carvalho de Melo 1014b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 1015b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= 10164fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt) { 1017b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10187c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10197c657876SArnaldo Carvalho de Melo } 10207c657876SArnaldo Carvalho de Melo return; 10217c657876SArnaldo Carvalho de Melo default: 10227c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 10237c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); 10247c657876SArnaldo Carvalho de Melo dump_stack(); 10257c657876SArnaldo Carvalho de Melo return; 10267c657876SArnaldo Carvalho de Melo } 10277c657876SArnaldo Carvalho de Melo 10287c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 10294fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", 10304fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10317c657876SArnaldo Carvalho de Melo 10327c657876SArnaldo Carvalho de Melo ccid3_hc_rx_detect_loss(sk); 10337c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10347c657876SArnaldo Carvalho de Melo 10357c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1036ae6706f0SArnaldo Carvalho de Melo if (!list_empty(&hcrx->ccid3hcrx_li_hist)) 10377c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1038ae6706f0SArnaldo Carvalho de Melo hcrx->ccid3hcrx_p = 1000000 / dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 10397c657876SArnaldo Carvalho de Melo 10407c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10417c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10427c657876SArnaldo Carvalho de Melo return; 10437c657876SArnaldo Carvalho de Melo } 10447c657876SArnaldo Carvalho de Melo } 10457c657876SArnaldo Carvalho de Melo 10467c657876SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct sock *sk) 10477c657876SArnaldo Carvalho de Melo { 10487c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 10497c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx; 10507c657876SArnaldo Carvalho de Melo 10517c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10527c657876SArnaldo Carvalho de Melo 105359725dc2SArnaldo Carvalho de Melo dp->dccps_hc_rx_ccid_private = kmalloc(sizeof(*hcrx), gfp_any()); 105459725dc2SArnaldo Carvalho de Melo if (dp->dccps_hc_rx_ccid_private == NULL) 10557c657876SArnaldo Carvalho de Melo return -ENOMEM; 10567c657876SArnaldo Carvalho de Melo 105759725dc2SArnaldo Carvalho de Melo hcrx = ccid3_hc_rx_sk(sk); 10587c657876SArnaldo Carvalho de Melo memset(hcrx, 0, sizeof(*hcrx)); 10597c657876SArnaldo Carvalho de Melo 1060a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 1061a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 1062a84ffe43SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = dp->dccps_packet_size; 10637c657876SArnaldo Carvalho de Melo else 10647c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; 10657c657876SArnaldo Carvalho de Melo 10667c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 10677c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1068ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 1069b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack); 1070954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack; 1071954ee31fSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */ 10727c657876SArnaldo Carvalho de Melo return 0; 10737c657876SArnaldo Carvalho de Melo } 10747c657876SArnaldo Carvalho de Melo 10757c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 10767c657876SArnaldo Carvalho de Melo { 107759725dc2SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10787c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 10797c657876SArnaldo Carvalho de Melo 108059d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10817c657876SArnaldo Carvalho de Melo 10827c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 10837c657876SArnaldo Carvalho de Melo 10847c657876SArnaldo Carvalho de Melo /* Empty packet history */ 10858c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 10867c657876SArnaldo Carvalho de Melo 10877c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1088ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 10897c657876SArnaldo Carvalho de Melo 10907c657876SArnaldo Carvalho de Melo kfree(dp->dccps_hc_rx_ccid_private); 10917c657876SArnaldo Carvalho de Melo dp->dccps_hc_rx_ccid_private = NULL; 10927c657876SArnaldo Carvalho de Melo } 10937c657876SArnaldo Carvalho de Melo 10942babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 10952babe1f6SArnaldo Carvalho de Melo { 109659725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); 10972babe1f6SArnaldo Carvalho de Melo 109859d203f9SArnaldo Carvalho de Melo BUG_ON(hcrx == NULL); 10992babe1f6SArnaldo Carvalho de Melo 11002babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11012babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11022babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11032babe1f6SArnaldo Carvalho de Melo } 11042babe1f6SArnaldo Carvalho de Melo 11052babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 11062babe1f6SArnaldo Carvalho de Melo { 110759725dc2SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); 11082babe1f6SArnaldo Carvalho de Melo 110959d203f9SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 11102babe1f6SArnaldo Carvalho de Melo 11112babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 11122babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 11132babe1f6SArnaldo Carvalho de Melo } 11142babe1f6SArnaldo Carvalho de Melo 11157c657876SArnaldo Carvalho de Melo static struct ccid ccid3 = { 11167c657876SArnaldo Carvalho de Melo .ccid_id = 3, 11177c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 11187c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 11197c657876SArnaldo Carvalho de Melo .ccid_init = ccid3_init, 11207c657876SArnaldo Carvalho de Melo .ccid_exit = ccid3_exit, 11217c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 11227c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 11237c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 11247c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 11257c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 11267c657876SArnaldo Carvalho de Melo .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, 11277c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 11287c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 11297c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 11307c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 11317c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 11322babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 11332babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 11347c657876SArnaldo Carvalho de Melo }; 11357c657876SArnaldo Carvalho de Melo 11367c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 11377c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 11387c657876SArnaldo Carvalho de Melo 11397c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 11407c657876SArnaldo Carvalho de Melo { 11418c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 11427c657876SArnaldo Carvalho de Melo 11438c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 11448c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 11457c657876SArnaldo Carvalho de Melo goto out; 11467c657876SArnaldo Carvalho de Melo 11478c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 11488c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 11498c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 11507c657876SArnaldo Carvalho de Melo 1151ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1152ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 11538c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 11547c657876SArnaldo Carvalho de Melo 11557c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 11567c657876SArnaldo Carvalho de Melo if (rc != 0) 11577c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 11587c657876SArnaldo Carvalho de Melo out: 11597c657876SArnaldo Carvalho de Melo return rc; 11608c60f3faSArnaldo Carvalho de Melo 11617c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1162ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1163ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 11648c60f3faSArnaldo Carvalho de Melo out_free_tx: 11658c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 11668c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 11678c60f3faSArnaldo Carvalho de Melo out_free_rx: 11688c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 11698c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 11707c657876SArnaldo Carvalho de Melo goto out; 11717c657876SArnaldo Carvalho de Melo } 11727c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 11737c657876SArnaldo Carvalho de Melo 11747c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 11757c657876SArnaldo Carvalho de Melo { 1176725ba8eeSArnaldo Carvalho de Melo #ifdef CONFIG_IP_DCCP_UNLOAD_HACK 1177725ba8eeSArnaldo Carvalho de Melo /* 1178725ba8eeSArnaldo Carvalho de Melo * Hack to use while developing, so that we get rid of the control 1179725ba8eeSArnaldo Carvalho de Melo * sock, that is what keeps a refcount on dccp.ko -acme 1180725ba8eeSArnaldo Carvalho de Melo */ 1181725ba8eeSArnaldo Carvalho de Melo extern void dccp_ctl_sock_exit(void); 1182725ba8eeSArnaldo Carvalho de Melo 1183725ba8eeSArnaldo Carvalho de Melo dccp_ctl_sock_exit(); 1184725ba8eeSArnaldo Carvalho de Melo #endif 11857c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 11867c657876SArnaldo Carvalho de Melo 11878c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 11888c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 11898c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 11907c657876SArnaldo Carvalho de Melo } 11918c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 11928c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 11938c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 11947c657876SArnaldo Carvalho de Melo } 1195ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1196ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1197ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 11987c657876SArnaldo Carvalho de Melo } 11997c657876SArnaldo Carvalho de Melo } 12007c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12017c657876SArnaldo Carvalho de Melo 12021f2333aeSArnaldo Carvalho de Melo MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz>, " 12031f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12047c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12057c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12067c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1207