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 /* 466b5e633aSArnaldo Carvalho de Melo * Reason for maths with 10 here is to avoid 32 bit overflow when a is big. 476b5e633aSArnaldo Carvalho de Melo */ 486b5e633aSArnaldo Carvalho de Melo static inline u32 usecs_div(const u32 a, const u32 b) 496b5e633aSArnaldo Carvalho de Melo { 506b5e633aSArnaldo Carvalho de Melo const u32 tmp = a * (USEC_PER_SEC / 10); 516b5e633aSArnaldo Carvalho de Melo return b > 20 ? tmp / (b / 10) : tmp; 526b5e633aSArnaldo Carvalho de Melo } 536b5e633aSArnaldo Carvalho de Melo 54cfc3c525SArnaldo Carvalho de Melo static int ccid3_debug; 557c657876SArnaldo Carvalho de Melo 56cfc3c525SArnaldo Carvalho de Melo #ifdef CCID3_DEBUG 577c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) \ 587c657876SArnaldo Carvalho de Melo do { if (ccid3_debug) \ 597c657876SArnaldo Carvalho de Melo printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \ 607c657876SArnaldo Carvalho de Melo } while (0) 617c657876SArnaldo Carvalho de Melo #else 627c657876SArnaldo Carvalho de Melo #define ccid3_pr_debug(format, a...) 637c657876SArnaldo Carvalho de Melo #endif 647c657876SArnaldo Carvalho de Melo 65a1d3a355SArnaldo Carvalho de Melo static struct dccp_tx_hist *ccid3_tx_hist; 66a1d3a355SArnaldo Carvalho de Melo static struct dccp_rx_hist *ccid3_rx_hist; 67ae6706f0SArnaldo Carvalho de Melo static struct dccp_li_hist *ccid3_li_hist; 687c657876SArnaldo Carvalho de Melo 697c657876SArnaldo Carvalho de Melo static int ccid3_init(struct sock *sk) 707c657876SArnaldo Carvalho de Melo { 717c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 727c657876SArnaldo Carvalho de Melo return 0; 737c657876SArnaldo Carvalho de Melo } 747c657876SArnaldo Carvalho de Melo 757c657876SArnaldo Carvalho de Melo static void ccid3_exit(struct sock *sk) 767c657876SArnaldo Carvalho de Melo { 777c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 787c657876SArnaldo Carvalho de Melo } 797c657876SArnaldo Carvalho de Melo 807c657876SArnaldo Carvalho de Melo /* TFRC sender states */ 817c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states { 827c657876SArnaldo Carvalho de Melo TFRC_SSTATE_NO_SENT = 1, 837c657876SArnaldo Carvalho de Melo TFRC_SSTATE_NO_FBACK, 847c657876SArnaldo Carvalho de Melo TFRC_SSTATE_FBACK, 857c657876SArnaldo Carvalho de Melo TFRC_SSTATE_TERM, 867c657876SArnaldo Carvalho de Melo }; 877c657876SArnaldo Carvalho de Melo 887c657876SArnaldo Carvalho de Melo #ifdef CCID3_DEBUG 897c657876SArnaldo Carvalho de Melo static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state) 907c657876SArnaldo Carvalho de Melo { 917c657876SArnaldo Carvalho de Melo static char *ccid3_state_names[] = { 927c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_SENT] = "NO_SENT", 937c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_NO_FBACK] = "NO_FBACK", 947c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_FBACK] = "FBACK", 957c657876SArnaldo Carvalho de Melo [TFRC_SSTATE_TERM] = "TERM", 967c657876SArnaldo Carvalho de Melo }; 977c657876SArnaldo Carvalho de Melo 987c657876SArnaldo Carvalho de Melo return ccid3_state_names[state]; 997c657876SArnaldo Carvalho de Melo } 1007c657876SArnaldo Carvalho de Melo #endif 1017c657876SArnaldo Carvalho de Melo 1021f2333aeSArnaldo Carvalho de Melo static inline void ccid3_hc_tx_set_state(struct sock *sk, 1031f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_tx_states state) 1047c657876SArnaldo Carvalho de Melo { 1057c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 1067c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 1077c657876SArnaldo Carvalho de Melo enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state; 1087c657876SArnaldo Carvalho de Melo 1097c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 1101f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_tx_state_name(oldstate), 1111f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(state)); 1127c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 1137c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = state; 1147c657876SArnaldo Carvalho de Melo } 1157c657876SArnaldo Carvalho de Melo 1167c657876SArnaldo Carvalho de Melo /* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */ 1177c657876SArnaldo Carvalho de Melo static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx) 1187c657876SArnaldo Carvalho de Melo { 1196b5e633aSArnaldo Carvalho de Melo /* 1206b5e633aSArnaldo Carvalho de Melo * If no feedback spec says t_ipi is 1 second (set elsewhere and then 1216b5e633aSArnaldo Carvalho de Melo * doubles after every no feedback timer (separate function) 1226b5e633aSArnaldo Carvalho de Melo */ 1236b5e633aSArnaldo Carvalho de Melo if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK) 1246b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s, 1256b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x); 1267c657876SArnaldo Carvalho de Melo } 1277c657876SArnaldo Carvalho de Melo 1287c657876SArnaldo Carvalho de Melo /* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */ 1297c657876SArnaldo Carvalho de Melo static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx) 1307c657876SArnaldo Carvalho de Melo { 1311f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, 1321f2333aeSArnaldo Carvalho de Melo TFRC_OPSYS_HALF_TIME_GRAN); 1337c657876SArnaldo Carvalho de Melo } 1347c657876SArnaldo Carvalho de Melo 1357c657876SArnaldo Carvalho de Melo /* 1367c657876SArnaldo Carvalho de Melo * Update X by 1377c657876SArnaldo Carvalho de Melo * If (p > 0) 1387c657876SArnaldo Carvalho de Melo * x_calc = calcX(s, R, p); 1397c657876SArnaldo Carvalho de Melo * X = max(min(X_calc, 2 * X_recv), s / t_mbi); 1407c657876SArnaldo Carvalho de Melo * Else 1417c657876SArnaldo Carvalho de Melo * If (now - tld >= R) 1427c657876SArnaldo Carvalho de Melo * X = max(min(2 * X, 2 * X_recv), s / R); 1437c657876SArnaldo Carvalho de Melo * tld = now; 1447c657876SArnaldo Carvalho de Melo */ 1457c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_update_x(struct sock *sk) 1467c657876SArnaldo Carvalho de Melo { 1477c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 1487c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 1497c657876SArnaldo Carvalho de Melo 1501f2333aeSArnaldo Carvalho de Melo /* To avoid large error in calcX */ 1511f2333aeSArnaldo Carvalho de Melo if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { 15236729c1aSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s, 1537c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, 1547c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p); 1551f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, 1561f2333aeSArnaldo Carvalho de Melo 2 * hctx->ccid3hctx_x_recv), 1571f2333aeSArnaldo Carvalho de Melo (hctx->ccid3hctx_s / 1581f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)); 159b6ee3d4aSArnaldo Carvalho de Melo } else { 160b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 161b6ee3d4aSArnaldo Carvalho de Melo 162b6ee3d4aSArnaldo Carvalho de Melo do_gettimeofday(&now); 163b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >= 164b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt) { 1656b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv, 1666b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x) * 2, 1676b5e633aSArnaldo Carvalho de Melo usecs_div(hctx->ccid3hctx_s, 1686b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt)); 169b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ld = now; 170b6ee3d4aSArnaldo Carvalho de Melo } 1717c657876SArnaldo Carvalho de Melo } 1727c657876SArnaldo Carvalho de Melo } 1737c657876SArnaldo Carvalho de Melo 1747c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_no_feedback_timer(unsigned long data) 1757c657876SArnaldo Carvalho de Melo { 1767c657876SArnaldo Carvalho de Melo struct sock *sk = (struct sock *)data; 1777c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 1787c657876SArnaldo Carvalho de Melo unsigned long next_tmout = 0; 1797c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 1807c657876SArnaldo Carvalho de Melo 1817c657876SArnaldo Carvalho de Melo bh_lock_sock(sk); 1827c657876SArnaldo Carvalho de Melo if (sock_owned_by_user(sk)) { 1837c657876SArnaldo Carvalho de Melo /* Try again later. */ 1847c657876SArnaldo Carvalho de Melo /* XXX: set some sensible MIB */ 1851f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 1861f2333aeSArnaldo Carvalho de Melo jiffies + HZ / 5); 1877c657876SArnaldo Carvalho de Melo goto out; 1887c657876SArnaldo Carvalho de Melo } 1897c657876SArnaldo Carvalho de Melo 1907c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk, 1917c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 1927c657876SArnaldo Carvalho de Melo 1937c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 1947c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_TERM: 1957c657876SArnaldo Carvalho de Melo goto out; 1967c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 1977c657876SArnaldo Carvalho de Melo /* Halve send rate */ 1987c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x /= 2; 1996b5e633aSArnaldo Carvalho de Melo if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / 2006b5e633aSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME)) 2011f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = (hctx->ccid3hctx_s / 2021f2333aeSArnaldo Carvalho de Melo TFRC_MAX_BACK_OFF_TIME); 2037c657876SArnaldo Carvalho de Melo 2041f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d " 2051f2333aeSArnaldo Carvalho de Melo "bytes/s\n", 2061f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2071f2333aeSArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state), 2087c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x); 2096b5e633aSArnaldo Carvalho de Melo next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s, 2106b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x), 2111f2333aeSArnaldo Carvalho de Melo TFRC_INITIAL_TIMEOUT); 2121f2333aeSArnaldo Carvalho de Melo /* 2131f2333aeSArnaldo Carvalho de Melo * FIXME - not sure above calculation is correct. See section 2141f2333aeSArnaldo Carvalho de Melo * 5 of CCID3 11 should adjust tx_t_ipi and double that to 2151f2333aeSArnaldo Carvalho de Melo * achieve it really 2161f2333aeSArnaldo Carvalho de Melo */ 2177c657876SArnaldo Carvalho de Melo break; 2187c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 2191f2333aeSArnaldo Carvalho de Melo /* 2201f2333aeSArnaldo Carvalho de Melo * Check if IDLE since last timeout and recv rate is less than 2211f2333aeSArnaldo Carvalho de Melo * 4 packets per RTT 2221f2333aeSArnaldo Carvalho de Melo */ 2231f2333aeSArnaldo Carvalho de Melo if (!hctx->ccid3hctx_idle || 2246b5e633aSArnaldo Carvalho de Melo (hctx->ccid3hctx_x_recv >= 2256b5e633aSArnaldo Carvalho de Melo 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) { 2261f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", 2271f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 2287c657876SArnaldo Carvalho de Melo ccid3_tx_state_name(hctx->ccid3hctx_state)); 2297c657876SArnaldo Carvalho de Melo /* Halve sending rate */ 2307c657876SArnaldo Carvalho de Melo 2317c657876SArnaldo Carvalho de Melo /* If (X_calc > 2 * X_recv) 2327c657876SArnaldo Carvalho de Melo * X_recv = max(X_recv / 2, s / (2 * t_mbi)); 2337c657876SArnaldo Carvalho de Melo * Else 2347c657876SArnaldo Carvalho de Melo * X_recv = X_calc / 4; 2357c657876SArnaldo Carvalho de Melo */ 2361f2333aeSArnaldo Carvalho de Melo BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && 2371f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc == 0); 2387c657876SArnaldo Carvalho de Melo 2397c657876SArnaldo Carvalho de Melo /* check also if p is zero -> x_calc is infinity? */ 2407c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P || 2417c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_calc > 2 * hctx->ccid3hctx_x_recv) 2427c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = max_t(u32, hctx->ccid3hctx_x_recv / 2, 2437c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s / (2 * TFRC_MAX_BACK_OFF_TIME)); 2447c657876SArnaldo Carvalho de Melo else 2457c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc / 4; 2467c657876SArnaldo Carvalho de Melo 2477c657876SArnaldo Carvalho de Melo /* Update sending rate */ 2487c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 2497c657876SArnaldo Carvalho de Melo } 2506b5e633aSArnaldo Carvalho de Melo /* 2516b5e633aSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 2526b5e633aSArnaldo Carvalho de Melo * max(4 * R, 2 * s / X) 2536b5e633aSArnaldo Carvalho de Melo */ 254c68e64cfSArnaldo Carvalho de Melo next_tmout = max_t(u32, hctx->ccid3hctx_t_rto, 2556b5e633aSArnaldo Carvalho de Melo 2 * usecs_div(hctx->ccid3hctx_s, 2566b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x)); 2577c657876SArnaldo Carvalho de Melo break; 2587c657876SArnaldo Carvalho de Melo default: 2597c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 2607c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 2617c657876SArnaldo Carvalho de Melo dump_stack(); 2627c657876SArnaldo Carvalho de Melo goto out; 2637c657876SArnaldo Carvalho de Melo } 2647c657876SArnaldo Carvalho de Melo 2657c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 2667c657876SArnaldo Carvalho de Melo jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); 2677c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 2687c657876SArnaldo Carvalho de Melo out: 2697c657876SArnaldo Carvalho de Melo bh_unlock_sock(sk); 2707c657876SArnaldo Carvalho de Melo sock_put(sk); 2717c657876SArnaldo Carvalho de Melo } 2727c657876SArnaldo Carvalho de Melo 27327258ee5SArnaldo Carvalho de Melo static int ccid3_hc_tx_send_packet(struct sock *sk, 27427258ee5SArnaldo Carvalho de Melo struct sk_buff *skb, int len) 2757c657876SArnaldo Carvalho de Melo { 2767c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 2777c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 2788c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *new_packet; 2797c657876SArnaldo Carvalho de Melo struct timeval now; 28027258ee5SArnaldo Carvalho de Melo long delay; 2817c657876SArnaldo Carvalho de Melo int rc = -ENOTCONN; 2827c657876SArnaldo Carvalho de Melo 2831f2333aeSArnaldo Carvalho de Melo /* Check if pure ACK or Terminating*/ 2841f2333aeSArnaldo Carvalho de Melo 2857c657876SArnaldo Carvalho de Melo /* 2861f2333aeSArnaldo Carvalho de Melo * XXX: We only call this function for DATA and DATAACK, on, these 2871f2333aeSArnaldo Carvalho de Melo * packets can have zero length, but why the comment about "pure ACK"? 2887c657876SArnaldo Carvalho de Melo */ 2891f2333aeSArnaldo Carvalho de Melo if (hctx == NULL || len == 0 || 2901f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_state == TFRC_SSTATE_TERM) 2917c657876SArnaldo Carvalho de Melo goto out; 2927c657876SArnaldo Carvalho de Melo 2937c657876SArnaldo Carvalho de Melo /* See if last packet allocated was not sent */ 2948c60f3faSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 2958c60f3faSArnaldo Carvalho de Melo if (new_packet == NULL || new_packet->dccphtx_sent) { 2961f2333aeSArnaldo Carvalho de Melo new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, 2971f2333aeSArnaldo Carvalho de Melo SLAB_ATOMIC); 2987c657876SArnaldo Carvalho de Melo 2997c657876SArnaldo Carvalho de Melo rc = -ENOBUFS; 3007c657876SArnaldo Carvalho de Melo if (new_packet == NULL) { 3017c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, not enough mem to add " 3021f2333aeSArnaldo Carvalho de Melo "to history, send refused\n", 3031f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk); 3047c657876SArnaldo Carvalho de Melo goto out; 3057c657876SArnaldo Carvalho de Melo } 3067c657876SArnaldo Carvalho de Melo 3078c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet); 3087c657876SArnaldo Carvalho de Melo } 3097c657876SArnaldo Carvalho de Melo 3107c657876SArnaldo Carvalho de Melo do_gettimeofday(&now); 3117c657876SArnaldo Carvalho de Melo 3127c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 3137c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 3141f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, first packet(%llu)\n", 3151f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, dp->dccps_gss); 3167c657876SArnaldo Carvalho de Melo 3177c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer; 3187c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk; 3191f2333aeSArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 3201f2333aeSArnaldo Carvalho de Melo jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)); 3217c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = 0; 3227c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 3237c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK); 3247c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi = TFRC_INITIAL_TIMEOUT; 3257c657876SArnaldo Carvalho de Melo 3267c657876SArnaldo Carvalho de Melo /* Set nominal send time for initial packet */ 3277c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 328b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 329b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 3307c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 3317c657876SArnaldo Carvalho de Melo rc = 0; 3327c657876SArnaldo Carvalho de Melo break; 3337c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 3347c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 335b6ee3d4aSArnaldo Carvalho de Melo delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) - 336b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_delta); 33727258ee5SArnaldo Carvalho de Melo ccid3_pr_debug("send_packet delay=%ld\n", delay); 33827258ee5SArnaldo Carvalho de Melo delay /= -1000; 3397c657876SArnaldo Carvalho de Melo /* divide by -1000 is to convert to ms and get sign right */ 340d6809c12SArnaldo Carvalho de Melo rc = delay > 0 ? delay : 0; 3417c657876SArnaldo Carvalho de Melo break; 3427c657876SArnaldo Carvalho de Melo default: 3437c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 3447c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 3457c657876SArnaldo Carvalho de Melo dump_stack(); 3467c657876SArnaldo Carvalho de Melo rc = -EINVAL; 3477c657876SArnaldo Carvalho de Melo break; 3487c657876SArnaldo Carvalho de Melo } 3497c657876SArnaldo Carvalho de Melo 3507c657876SArnaldo Carvalho de Melo /* Can we send? if so add options and add to packet history */ 3517c657876SArnaldo Carvalho de Melo if (rc == 0) 352c1734376SArnaldo Carvalho de Melo new_packet->dccphtx_ccval = 3538c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = 3548c60f3faSArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count; 3557c657876SArnaldo Carvalho de Melo out: 3567c657876SArnaldo Carvalho de Melo return rc; 3577c657876SArnaldo Carvalho de Melo } 3587c657876SArnaldo Carvalho de Melo 3597c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len) 3607c657876SArnaldo Carvalho de Melo { 3617c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 3627c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 3637c657876SArnaldo Carvalho de Melo struct timeval now; 3647c657876SArnaldo Carvalho de Melo 3657c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 3667c657876SArnaldo Carvalho de Melo 3677c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) { 3687c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, while state is TFRC_SSTATE_TERM!\n", 3697c657876SArnaldo Carvalho de Melo dccp_role(sk), sk); 3707c657876SArnaldo Carvalho de Melo return; 3717c657876SArnaldo Carvalho de Melo } 3727c657876SArnaldo Carvalho de Melo 3737c657876SArnaldo Carvalho de Melo do_gettimeofday(&now); 3747c657876SArnaldo Carvalho de Melo 3757c657876SArnaldo Carvalho de Melo /* check if we have sent a data packet */ 3767c657876SArnaldo Carvalho de Melo if (len > 0) { 3777c657876SArnaldo Carvalho de Melo unsigned long quarter_rtt; 3788c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 3797c657876SArnaldo Carvalho de Melo 3808c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); 3818c60f3faSArnaldo Carvalho de Melo if (packet == NULL) { 3821f2333aeSArnaldo Carvalho de Melo printk(KERN_CRIT "%s: packet doesn't exists in " 3831f2333aeSArnaldo Carvalho de Melo "history!\n", __FUNCTION__); 3847c657876SArnaldo Carvalho de Melo return; 3857c657876SArnaldo Carvalho de Melo } 3868c60f3faSArnaldo Carvalho de Melo if (packet->dccphtx_sent) { 3871f2333aeSArnaldo Carvalho de Melo printk(KERN_CRIT "%s: no unsent packet in history!\n", 3881f2333aeSArnaldo Carvalho de Melo __FUNCTION__); 3897c657876SArnaldo Carvalho de Melo return; 3907c657876SArnaldo Carvalho de Melo } 3918c60f3faSArnaldo Carvalho de Melo packet->dccphtx_tstamp = now; 3928c60f3faSArnaldo Carvalho de Melo packet->dccphtx_seqno = dp->dccps_gss; 3937c657876SArnaldo Carvalho de Melo /* 3941f2333aeSArnaldo Carvalho de Melo * Check if win_count have changed 3951f2333aeSArnaldo Carvalho de Melo * Algorithm in "8.1. Window Counter Valuer" in 3961f2333aeSArnaldo Carvalho de Melo * draft-ietf-dccp-ccid3-11.txt 3977c657876SArnaldo Carvalho de Melo */ 3986b5e633aSArnaldo Carvalho de Melo quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count); 3996b5e633aSArnaldo Carvalho de Melo if (likely(hctx->ccid3hctx_rtt > 8)) 4006b5e633aSArnaldo Carvalho de Melo quarter_rtt /= hctx->ccid3hctx_rtt / 4; 4016b5e633aSArnaldo Carvalho de Melo 4027c657876SArnaldo Carvalho de Melo if (quarter_rtt > 0) { 4037c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_last_win_count = now; 4047c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count + 4057c657876SArnaldo Carvalho de Melo min_t(unsigned long, quarter_rtt, 5)) % 16; 4061f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, window changed from " 4071f2333aeSArnaldo Carvalho de Melo "%u to %u!\n", 4087c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 409c1734376SArnaldo Carvalho de Melo packet->dccphtx_ccval, 4107c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_last_win_count); 4117c657876SArnaldo Carvalho de Melo } 4121f2333aeSArnaldo Carvalho de Melo 4137c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 0; 414c1734376SArnaldo Carvalho de Melo packet->dccphtx_rtt = hctx->ccid3hctx_rtt; 4158c60f3faSArnaldo Carvalho de Melo packet->dccphtx_sent = 1; 4167c657876SArnaldo Carvalho de Melo } else 4177c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n", 4187c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, dp->dccps_gss); 4197c657876SArnaldo Carvalho de Melo 4207c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4217c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 4227c657876SArnaldo Carvalho de Melo /* if first wasn't pure ack */ 4237c657876SArnaldo Carvalho de Melo if (len != 0) 4241f2333aeSArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, First packet sent is noted " 4251f2333aeSArnaldo Carvalho de Melo "as a data packet\n", 4267c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk)); 4277c657876SArnaldo Carvalho de Melo return; 4287c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4297c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4307c657876SArnaldo Carvalho de Melo if (len > 0) { 4317c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_t_nom = now; 4327c657876SArnaldo Carvalho de Melo ccid3_calc_new_t_ipi(hctx); 4337c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 434b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 435b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 4367c657876SArnaldo Carvalho de Melo } 4377c657876SArnaldo Carvalho de Melo break; 4387c657876SArnaldo Carvalho de Melo default: 4397c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 4407c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 4417c657876SArnaldo Carvalho de Melo dump_stack(); 4427c657876SArnaldo Carvalho de Melo break; 4437c657876SArnaldo Carvalho de Melo } 4447c657876SArnaldo Carvalho de Melo } 4457c657876SArnaldo Carvalho de Melo 4467c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 4477c657876SArnaldo Carvalho de Melo { 4487c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 4497c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 4507c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 4518c60f3faSArnaldo Carvalho de Melo struct dccp_tx_hist_entry *packet; 4527c657876SArnaldo Carvalho de Melo unsigned long next_tmout; 4531bc09869SIan McDonald u32 t_elapsed; 4547c657876SArnaldo Carvalho de Melo u32 pinv; 4557c657876SArnaldo Carvalho de Melo u32 x_recv; 4567c657876SArnaldo Carvalho de Melo u32 r_sample; 4571f2333aeSArnaldo Carvalho de Melo 4587c657876SArnaldo Carvalho de Melo if (hctx == NULL) 4597c657876SArnaldo Carvalho de Melo return; 4607c657876SArnaldo Carvalho de Melo 4617c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) { 4621f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, received a packet when " 4631f2333aeSArnaldo Carvalho de Melo "terminating!\n", dccp_role(sk), sk); 4647c657876SArnaldo Carvalho de Melo return; 4657c657876SArnaldo Carvalho de Melo } 4667c657876SArnaldo Carvalho de Melo 4677c657876SArnaldo Carvalho de Melo /* we are only interested in ACKs */ 4687c657876SArnaldo Carvalho de Melo if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || 4697c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) 4707c657876SArnaldo Carvalho de Melo return; 4717c657876SArnaldo Carvalho de Melo 4727c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 4737c657876SArnaldo Carvalho de Melo 4747c657876SArnaldo Carvalho de Melo t_elapsed = dp->dccps_options_received.dccpor_elapsed_time; 4757c657876SArnaldo Carvalho de Melo x_recv = opt_recv->ccid3or_receive_rate; 4767c657876SArnaldo Carvalho de Melo pinv = opt_recv->ccid3or_loss_event_rate; 4777c657876SArnaldo Carvalho de Melo 4787c657876SArnaldo Carvalho de Melo switch (hctx->ccid3hctx_state) { 4797c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_SENT: 4807c657876SArnaldo Carvalho de Melo /* FIXME: what to do here? */ 4817c657876SArnaldo Carvalho de Melo return; 4827c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_NO_FBACK: 4837c657876SArnaldo Carvalho de Melo case TFRC_SSTATE_FBACK: 4847c657876SArnaldo Carvalho de Melo /* Calculate new round trip sample by 4857c657876SArnaldo Carvalho de Melo * R_sample = (now - t_recvdata) - t_delay */ 4867c657876SArnaldo Carvalho de Melo /* get t_recvdata from history */ 4878c60f3faSArnaldo Carvalho de Melo packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, 4888c60f3faSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 4897c657876SArnaldo Carvalho de Melo if (packet == NULL) { 4901f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, seqno %llu(%s) does't " 4911f2333aeSArnaldo Carvalho de Melo "exist in history!\n", 4921f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 4931f2333aeSArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq, 4947c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 4957c657876SArnaldo Carvalho de Melo return; 4967c657876SArnaldo Carvalho de Melo } 4977c657876SArnaldo Carvalho de Melo 4987c657876SArnaldo Carvalho de Melo /* Update RTT */ 499b6ee3d4aSArnaldo Carvalho de Melo r_sample = timeval_now_delta(&packet->dccphtx_tstamp); 5007c657876SArnaldo Carvalho de Melo /* FIXME: */ 5017c657876SArnaldo Carvalho de Melo // r_sample -= usecs_to_jiffies(t_elapsed * 10); 5027c657876SArnaldo Carvalho de Melo 5037c657876SArnaldo Carvalho de Melo /* Update RTT estimate by 5047c657876SArnaldo Carvalho de Melo * If (No feedback recv) 5057c657876SArnaldo Carvalho de Melo * R = R_sample; 5067c657876SArnaldo Carvalho de Melo * Else 5077c657876SArnaldo Carvalho de Melo * R = q * R + (1 - q) * R_sample; 5087c657876SArnaldo Carvalho de Melo * 5097c657876SArnaldo Carvalho de Melo * q is a constant, RFC 3448 recomments 0.9 5107c657876SArnaldo Carvalho de Melo */ 5117c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) { 5127c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK); 5137c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = r_sample; 5147c657876SArnaldo Carvalho de Melo } else 5151f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + 5161f2333aeSArnaldo Carvalho de Melo r_sample / 10; 5177c657876SArnaldo Carvalho de Melo 5181f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, " 5191f2333aeSArnaldo Carvalho de Melo "r_sample=%us\n", dccp_role(sk), sk, 5201f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_rtt, r_sample); 5217c657876SArnaldo Carvalho de Melo 5227c657876SArnaldo Carvalho de Melo /* Update timeout interval */ 523c68e64cfSArnaldo Carvalho de Melo hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt, 524cef07fd6SArnaldo Carvalho de Melo USEC_PER_SEC); 5257c657876SArnaldo Carvalho de Melo 5267c657876SArnaldo Carvalho de Melo /* Update receive rate */ 5271f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */ 5287c657876SArnaldo Carvalho de Melo 5297c657876SArnaldo Carvalho de Melo /* Update loss event rate */ 5307c657876SArnaldo Carvalho de Melo if (pinv == ~0 || pinv == 0) 5317c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 0; 5327c657876SArnaldo Carvalho de Melo else { 5337c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = 1000000 / pinv; 5347c657876SArnaldo Carvalho de Melo 5357c657876SArnaldo Carvalho de Melo if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) { 5367c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_p = TFRC_SMALLEST_P; 5371f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", 5381f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk); 5397c657876SArnaldo Carvalho de Melo } 5407c657876SArnaldo Carvalho de Melo } 5417c657876SArnaldo Carvalho de Melo 5427c657876SArnaldo Carvalho de Melo /* unschedule no feedback timer */ 5437c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 5447c657876SArnaldo Carvalho de Melo 5457c657876SArnaldo Carvalho de Melo /* Update sending rate */ 5467c657876SArnaldo Carvalho de Melo ccid3_hc_tx_update_x(sk); 5477c657876SArnaldo Carvalho de Melo 5487c657876SArnaldo Carvalho de Melo /* Update next send time */ 549b6ee3d4aSArnaldo Carvalho de Melo timeval_sub_usecs(&hctx->ccid3hctx_t_nom, 550b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 5517c657876SArnaldo Carvalho de Melo ccid3_calc_new_t_ipi(hctx); 552b6ee3d4aSArnaldo Carvalho de Melo timeval_add_usecs(&hctx->ccid3hctx_t_nom, 553b6ee3d4aSArnaldo Carvalho de Melo hctx->ccid3hctx_t_ipi); 5547c657876SArnaldo Carvalho de Melo ccid3_calc_new_delta(hctx); 5557c657876SArnaldo Carvalho de Melo 5567c657876SArnaldo Carvalho de Melo /* remove all packets older than the one acked from history */ 5578c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge_older(ccid3_tx_hist, 5588c60f3faSArnaldo Carvalho de Melo &hctx->ccid3hctx_hist, packet); 559c530cfb1SArnaldo Carvalho de Melo /* 560c530cfb1SArnaldo Carvalho de Melo * As we have calculated new ipi, delta, t_nom it is possible that 561c530cfb1SArnaldo Carvalho de Melo * we now can send a packet, so wake up dccp_wait_for_ccids. 562c530cfb1SArnaldo Carvalho de Melo */ 563c530cfb1SArnaldo Carvalho de Melo sk->sk_write_space(sk); 5648c60f3faSArnaldo Carvalho de Melo 5651f2333aeSArnaldo Carvalho de Melo /* 5661f2333aeSArnaldo Carvalho de Melo * Schedule no feedback timer to expire in 5671f2333aeSArnaldo Carvalho de Melo * max(4 * R, 2 * s / X) 5681f2333aeSArnaldo Carvalho de Melo */ 569c68e64cfSArnaldo Carvalho de Melo next_tmout = max(hctx->ccid3hctx_t_rto, 5706b5e633aSArnaldo Carvalho de Melo 2 * usecs_div(hctx->ccid3hctx_s, 5716b5e633aSArnaldo Carvalho de Melo hctx->ccid3hctx_x)); 5727c657876SArnaldo Carvalho de Melo 5731f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " 5741f2333aeSArnaldo Carvalho de Melo "expire in %lu jiffies (%luus)\n", 5751f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 5761f2333aeSArnaldo Carvalho de Melo usecs_to_jiffies(next_tmout), next_tmout); 5777c657876SArnaldo Carvalho de Melo 5787c657876SArnaldo Carvalho de Melo sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, 5797c657876SArnaldo Carvalho de Melo jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout))); 5807c657876SArnaldo Carvalho de Melo 5817c657876SArnaldo Carvalho de Melo /* set idle flag */ 5827c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_idle = 1; 5837c657876SArnaldo Carvalho de Melo break; 5847c657876SArnaldo Carvalho de Melo default: 5857c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 5867c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hctx->ccid3hctx_state); 5877c657876SArnaldo Carvalho de Melo dump_stack(); 5887c657876SArnaldo Carvalho de Melo break; 5897c657876SArnaldo Carvalho de Melo } 5907c657876SArnaldo Carvalho de Melo } 5917c657876SArnaldo Carvalho de Melo 5927c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb) 5937c657876SArnaldo Carvalho de Melo { 5947c657876SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 5957c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 5967c657876SArnaldo Carvalho de Melo 5971f2333aeSArnaldo Carvalho de Melo if (hctx == NULL || !(sk->sk_state == DCCP_OPEN || 5981f2333aeSArnaldo Carvalho de Melo sk->sk_state == DCCP_PARTOPEN)) 5997c657876SArnaldo Carvalho de Melo return; 6007c657876SArnaldo Carvalho de Melo 6017c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count; 6027c657876SArnaldo Carvalho de Melo } 6037c657876SArnaldo Carvalho de Melo 6047c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, 6051f2333aeSArnaldo Carvalho de Melo unsigned char len, u16 idx, 6061f2333aeSArnaldo Carvalho de Melo unsigned char *value) 6077c657876SArnaldo Carvalho de Melo { 6087c657876SArnaldo Carvalho de Melo int rc = 0; 6097c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6107c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 6117c657876SArnaldo Carvalho de Melo struct ccid3_options_received *opt_recv; 6127c657876SArnaldo Carvalho de Melo 6137c657876SArnaldo Carvalho de Melo if (hctx == NULL) 6147c657876SArnaldo Carvalho de Melo return 0; 6157c657876SArnaldo Carvalho de Melo 6167c657876SArnaldo Carvalho de Melo opt_recv = &hctx->ccid3hctx_options_received; 6177c657876SArnaldo Carvalho de Melo 6187c657876SArnaldo Carvalho de Melo if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { 6197c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_seqno = dp->dccps_gsr; 6207c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ~0; 6217c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = 0; 6227c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = 0; 6237c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = 0; 6247c657876SArnaldo Carvalho de Melo } 6257c657876SArnaldo Carvalho de Melo 6267c657876SArnaldo Carvalho de Melo switch (option) { 6277c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_EVENT_RATE: 6287c657876SArnaldo Carvalho de Melo if (len != 4) { 6291f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, invalid len for " 6301f2333aeSArnaldo Carvalho de Melo "TFRC_OPT_LOSS_EVENT_RATE\n", 6317c657876SArnaldo Carvalho de Melo dccp_role(sk), sk); 6327c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6337c657876SArnaldo Carvalho de Melo } else { 6347c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate = ntohl(*(u32 *)value); 6357c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_EVENT_RATE=%u\n", 6367c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6377c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_event_rate); 6387c657876SArnaldo Carvalho de Melo } 6397c657876SArnaldo Carvalho de Melo break; 6407c657876SArnaldo Carvalho de Melo case TFRC_OPT_LOSS_INTERVALS: 6417c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx = idx; 6427c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len = len; 6437c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, LOSS_INTERVALS=(%u, %u)\n", 6447c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6457c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_idx, 6467c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_loss_intervals_len); 6477c657876SArnaldo Carvalho de Melo break; 6487c657876SArnaldo Carvalho de Melo case TFRC_OPT_RECEIVE_RATE: 6497c657876SArnaldo Carvalho de Melo if (len != 4) { 6501f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, invalid len for " 6511f2333aeSArnaldo Carvalho de Melo "TFRC_OPT_RECEIVE_RATE\n", 6527c657876SArnaldo Carvalho de Melo dccp_role(sk), sk); 6537c657876SArnaldo Carvalho de Melo rc = -EINVAL; 6547c657876SArnaldo Carvalho de Melo } else { 6557c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate = ntohl(*(u32 *)value); 6567c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, RECEIVE_RATE=%u\n", 6577c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 6587c657876SArnaldo Carvalho de Melo opt_recv->ccid3or_receive_rate); 6597c657876SArnaldo Carvalho de Melo } 6607c657876SArnaldo Carvalho de Melo break; 6617c657876SArnaldo Carvalho de Melo } 6627c657876SArnaldo Carvalho de Melo 6637c657876SArnaldo Carvalho de Melo return rc; 6647c657876SArnaldo Carvalho de Melo } 6657c657876SArnaldo Carvalho de Melo 6667c657876SArnaldo Carvalho de Melo static int ccid3_hc_tx_init(struct sock *sk) 6677c657876SArnaldo Carvalho de Melo { 6687c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6697c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx; 6707c657876SArnaldo Carvalho de Melo 6717c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 6727c657876SArnaldo Carvalho de Melo 6731f2333aeSArnaldo Carvalho de Melo hctx = dp->dccps_hc_tx_ccid_private = kmalloc(sizeof(*hctx), 6741f2333aeSArnaldo Carvalho de Melo gfp_any()); 6757c657876SArnaldo Carvalho de Melo if (hctx == NULL) 6767c657876SArnaldo Carvalho de Melo return -ENOMEM; 6777c657876SArnaldo Carvalho de Melo 6787c657876SArnaldo Carvalho de Melo memset(hctx, 0, sizeof(*hctx)); 6797c657876SArnaldo Carvalho de Melo 680a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 681a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 682a84ffe43SArnaldo Carvalho de Melo hctx->ccid3hctx_s = dp->dccps_packet_size; 6837c657876SArnaldo Carvalho de Melo else 6847c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE; 6857c657876SArnaldo Carvalho de Melo 6861f2333aeSArnaldo Carvalho de Melo /* Set transmission rate to 1 packet per second */ 6871f2333aeSArnaldo Carvalho de Melo hctx->ccid3hctx_x = hctx->ccid3hctx_s; 688c68e64cfSArnaldo Carvalho de Melo hctx->ccid3hctx_t_rto = USEC_PER_SEC; 6897c657876SArnaldo Carvalho de Melo hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT; 6907c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hctx->ccid3hctx_hist); 6917c657876SArnaldo Carvalho de Melo init_timer(&hctx->ccid3hctx_no_feedback_timer); 6927c657876SArnaldo Carvalho de Melo 6937c657876SArnaldo Carvalho de Melo return 0; 6947c657876SArnaldo Carvalho de Melo } 6957c657876SArnaldo Carvalho de Melo 6967c657876SArnaldo Carvalho de Melo static void ccid3_hc_tx_exit(struct sock *sk) 6977c657876SArnaldo Carvalho de Melo { 6987c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 6997c657876SArnaldo Carvalho de Melo struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 7007c657876SArnaldo Carvalho de Melo 7017c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 7027c657876SArnaldo Carvalho de Melo BUG_ON(hctx == NULL); 7037c657876SArnaldo Carvalho de Melo 7047c657876SArnaldo Carvalho de Melo ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); 7057c657876SArnaldo Carvalho de Melo sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); 7067c657876SArnaldo Carvalho de Melo 7077c657876SArnaldo Carvalho de Melo /* Empty packet history */ 7088c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist); 7097c657876SArnaldo Carvalho de Melo 7107c657876SArnaldo Carvalho de Melo kfree(dp->dccps_hc_tx_ccid_private); 7117c657876SArnaldo Carvalho de Melo dp->dccps_hc_tx_ccid_private = NULL; 7127c657876SArnaldo Carvalho de Melo } 7137c657876SArnaldo Carvalho de Melo 7147c657876SArnaldo Carvalho de Melo /* 7157c657876SArnaldo Carvalho de Melo * RX Half Connection methods 7167c657876SArnaldo Carvalho de Melo */ 7177c657876SArnaldo Carvalho de Melo 7187c657876SArnaldo Carvalho de Melo /* TFRC receiver states */ 7197c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states { 7207c657876SArnaldo Carvalho de Melo TFRC_RSTATE_NO_DATA = 1, 7217c657876SArnaldo Carvalho de Melo TFRC_RSTATE_DATA, 7227c657876SArnaldo Carvalho de Melo TFRC_RSTATE_TERM = 127, 7237c657876SArnaldo Carvalho de Melo }; 7247c657876SArnaldo Carvalho de Melo 7257c657876SArnaldo Carvalho de Melo #ifdef CCID3_DEBUG 7267c657876SArnaldo Carvalho de Melo static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state) 7277c657876SArnaldo Carvalho de Melo { 7287c657876SArnaldo Carvalho de Melo static char *ccid3_rx_state_names[] = { 7297c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_NO_DATA] = "NO_DATA", 7307c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_DATA] = "DATA", 7317c657876SArnaldo Carvalho de Melo [TFRC_RSTATE_TERM] = "TERM", 7327c657876SArnaldo Carvalho de Melo }; 7337c657876SArnaldo Carvalho de Melo 7347c657876SArnaldo Carvalho de Melo return ccid3_rx_state_names[state]; 7357c657876SArnaldo Carvalho de Melo } 7367c657876SArnaldo Carvalho de Melo #endif 7377c657876SArnaldo Carvalho de Melo 7381f2333aeSArnaldo Carvalho de Melo static inline void ccid3_hc_rx_set_state(struct sock *sk, 7391f2333aeSArnaldo Carvalho de Melo enum ccid3_hc_rx_states state) 7407c657876SArnaldo Carvalho de Melo { 7417c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7427c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 7437c657876SArnaldo Carvalho de Melo enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state; 7447c657876SArnaldo Carvalho de Melo 7457c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s(%p) %-8.8s -> %s\n", 7461f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, ccid3_rx_state_name(oldstate), 7471f2333aeSArnaldo Carvalho de Melo ccid3_rx_state_name(state)); 7487c657876SArnaldo Carvalho de Melo WARN_ON(state == oldstate); 7497c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = state; 7507c657876SArnaldo Carvalho de Melo } 7517c657876SArnaldo Carvalho de Melo 7527c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_send_feedback(struct sock *sk) 7537c657876SArnaldo Carvalho de Melo { 7547c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 7557c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 7568c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 757b6ee3d4aSArnaldo Carvalho de Melo struct timeval now; 7587c657876SArnaldo Carvalho de Melo 7597c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 7607c657876SArnaldo Carvalho de Melo 761b6ee3d4aSArnaldo Carvalho de Melo do_gettimeofday(&now); 762b6ee3d4aSArnaldo Carvalho de Melo 7637c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 7647c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 7657c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = 0; 7667c657876SArnaldo Carvalho de Melo break; 7677c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: { 768b6ee3d4aSArnaldo Carvalho de Melo const u32 delta = timeval_delta(&now, 769b6ee3d4aSArnaldo Carvalho de Melo &hcrx->ccid3hcrx_tstamp_last_feedback); 7707c657876SArnaldo Carvalho de Melo 771cef07fd6SArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv = (hcrx->ccid3hcrx_bytes_recv * 772b6ee3d4aSArnaldo Carvalho de Melo USEC_PER_SEC); 773b6ee3d4aSArnaldo Carvalho de Melo if (likely(delta > 1)) 774b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_x_recv /= delta; 7757c657876SArnaldo Carvalho de Melo } 7767c657876SArnaldo Carvalho de Melo break; 7777c657876SArnaldo Carvalho de Melo default: 7787c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 7797c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); 7807c657876SArnaldo Carvalho de Melo dump_stack(); 7817c657876SArnaldo Carvalho de Melo return; 7827c657876SArnaldo Carvalho de Melo } 7837c657876SArnaldo Carvalho de Melo 7848c60f3faSArnaldo Carvalho de Melo packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); 7857c657876SArnaldo Carvalho de Melo if (packet == NULL) { 7867c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, no data packet in history!\n", 7877c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 7887c657876SArnaldo Carvalho de Melo dump_stack(); 7897c657876SArnaldo Carvalho de Melo return; 7907c657876SArnaldo Carvalho de Melo } 7917c657876SArnaldo Carvalho de Melo 792b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_feedback = now; 793c1734376SArnaldo Carvalho de Melo hcrx->ccid3hcrx_last_counter = packet->dccphrx_ccval; 7948c60f3faSArnaldo Carvalho de Melo hcrx->ccid3hcrx_seqno_last_counter = packet->dccphrx_seqno; 7957c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv = 0; 7967c657876SArnaldo Carvalho de Melo 7977c657876SArnaldo Carvalho de Melo /* Convert to multiples of 10us */ 798b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time = 799b6ee3d4aSArnaldo Carvalho de Melo timeval_delta(&now, &packet->dccphrx_tstamp) / 10; 8007c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p == 0) 8017c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = ~0; 8027c657876SArnaldo Carvalho de Melo else 8037c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p; 8047c657876SArnaldo Carvalho de Melo dccp_send_ack(sk); 8057c657876SArnaldo Carvalho de Melo } 8067c657876SArnaldo Carvalho de Melo 8077c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) 8087c657876SArnaldo Carvalho de Melo { 8097c657876SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 8104fded33bSArnaldo Carvalho de Melo u32 x_recv, pinv; 8117c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 8127c657876SArnaldo Carvalho de Melo 8131f2333aeSArnaldo Carvalho de Melo if (hcrx == NULL || !(sk->sk_state == DCCP_OPEN || 8141f2333aeSArnaldo Carvalho de Melo sk->sk_state == DCCP_PARTOPEN)) 8157c657876SArnaldo Carvalho de Melo return; 8167c657876SArnaldo Carvalho de Melo 8177c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter; 8184fded33bSArnaldo Carvalho de Melo 8194fded33bSArnaldo Carvalho de Melo if (dccp_packet_without_ack(skb)) 8204fded33bSArnaldo Carvalho de Melo return; 8214fded33bSArnaldo Carvalho de Melo 8224fded33bSArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_elapsed_time != 0) 8234fded33bSArnaldo Carvalho de Melo dccp_insert_option_elapsed_time(sk, skb, 8244fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_elapsed_time); 8254fded33bSArnaldo Carvalho de Melo dccp_insert_option_timestamp(sk, skb); 8264fded33bSArnaldo Carvalho de Melo x_recv = htonl(hcrx->ccid3hcrx_x_recv); 8274fded33bSArnaldo Carvalho de Melo pinv = htonl(hcrx->ccid3hcrx_pinv); 8284fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, 8294fded33bSArnaldo Carvalho de Melo &pinv, sizeof(pinv)); 8304fded33bSArnaldo Carvalho de Melo dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, 8314fded33bSArnaldo Carvalho de Melo &x_recv, sizeof(x_recv)); 8327c657876SArnaldo Carvalho de Melo } 8337c657876SArnaldo Carvalho de Melo 8347c657876SArnaldo Carvalho de Melo /* calculate first loss interval 8357c657876SArnaldo Carvalho de Melo * 8367c657876SArnaldo Carvalho de Melo * returns estimated loss interval in usecs */ 8377c657876SArnaldo Carvalho de Melo 8387c657876SArnaldo Carvalho de Melo static u32 ccid3_hc_rx_calc_first_li(struct sock *sk) 8397c657876SArnaldo Carvalho de Melo { 8407c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 8417c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 8428c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *entry, *next, *tail = NULL; 8437c657876SArnaldo Carvalho de Melo u32 rtt, delta, x_recv, fval, p, tmp2; 844b6ee3d4aSArnaldo Carvalho de Melo struct timeval tstamp = { 0, }; 8457c657876SArnaldo Carvalho de Melo int interval = 0; 8467c657876SArnaldo Carvalho de Melo int win_count = 0; 8477c657876SArnaldo Carvalho de Melo int step = 0; 8487c657876SArnaldo Carvalho de Melo u64 tmp1; 8497c657876SArnaldo Carvalho de Melo 8508c60f3faSArnaldo Carvalho de Melo list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, 8518c60f3faSArnaldo Carvalho de Melo dccphrx_node) { 8528c60f3faSArnaldo Carvalho de Melo if (dccp_rx_hist_entry_data_packet(entry)) { 8537c657876SArnaldo Carvalho de Melo tail = entry; 8547c657876SArnaldo Carvalho de Melo 8557c657876SArnaldo Carvalho de Melo switch (step) { 8567c657876SArnaldo Carvalho de Melo case 0: 8578c60f3faSArnaldo Carvalho de Melo tstamp = entry->dccphrx_tstamp; 858c1734376SArnaldo Carvalho de Melo win_count = entry->dccphrx_ccval; 8597c657876SArnaldo Carvalho de Melo step = 1; 8607c657876SArnaldo Carvalho de Melo break; 8617c657876SArnaldo Carvalho de Melo case 1: 862c1734376SArnaldo Carvalho de Melo interval = win_count - entry->dccphrx_ccval; 8637c657876SArnaldo Carvalho de Melo if (interval < 0) 8647c657876SArnaldo Carvalho de Melo interval += TFRC_WIN_COUNT_LIMIT; 8657c657876SArnaldo Carvalho de Melo if (interval > 4) 8667c657876SArnaldo Carvalho de Melo goto found; 8677c657876SArnaldo Carvalho de Melo break; 8687c657876SArnaldo Carvalho de Melo } 8697c657876SArnaldo Carvalho de Melo } 8707c657876SArnaldo Carvalho de Melo } 8717c657876SArnaldo Carvalho de Melo 8727c657876SArnaldo Carvalho de Melo if (step == 0) { 8731f2333aeSArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, packet history contains no " 8741f2333aeSArnaldo Carvalho de Melo "data packets!\n", 8757c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk); 8767c657876SArnaldo Carvalho de Melo return ~0; 8777c657876SArnaldo Carvalho de Melo } 8787c657876SArnaldo Carvalho de Melo 8797c657876SArnaldo Carvalho de Melo if (interval == 0) { 8801f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Could not find a win_count " 8811f2333aeSArnaldo Carvalho de Melo "interval > 0. Defaulting to 1\n", 8827c657876SArnaldo Carvalho de Melo dccp_role(sk), sk); 8837c657876SArnaldo Carvalho de Melo interval = 1; 8847c657876SArnaldo Carvalho de Melo } 8857c657876SArnaldo Carvalho de Melo found: 886b6ee3d4aSArnaldo Carvalho de Melo rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; 8877c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", 8887c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, rtt); 8897c657876SArnaldo Carvalho de Melo if (rtt == 0) 8907c657876SArnaldo Carvalho de Melo rtt = 1; 8917c657876SArnaldo Carvalho de Melo 892b6ee3d4aSArnaldo Carvalho de Melo delta = timeval_now_delta(&hcrx->ccid3hcrx_tstamp_last_feedback); 893b6ee3d4aSArnaldo Carvalho de Melo x_recv = hcrx->ccid3hcrx_bytes_recv * USEC_PER_SEC; 894b6ee3d4aSArnaldo Carvalho de Melo if (likely(delta > 1)) 895b6ee3d4aSArnaldo Carvalho de Melo x_recv /= delta; 8967c657876SArnaldo Carvalho de Melo 8977c657876SArnaldo Carvalho de Melo tmp1 = (u64)x_recv * (u64)rtt; 8987c657876SArnaldo Carvalho de Melo do_div(tmp1,10000000); 8997c657876SArnaldo Carvalho de Melo tmp2 = (u32)tmp1; 9007c657876SArnaldo Carvalho de Melo fval = (hcrx->ccid3hcrx_s * 100000) / tmp2; 9017c657876SArnaldo Carvalho de Melo /* do not alter order above or you will get overflow on 32 bit */ 90236729c1aSArnaldo Carvalho de Melo p = tfrc_calc_x_reverse_lookup(fval); 9031f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied " 9041f2333aeSArnaldo Carvalho de Melo "loss rate=%u\n", dccp_role(sk), sk, x_recv, p); 9057c657876SArnaldo Carvalho de Melo 9067c657876SArnaldo Carvalho de Melo if (p == 0) 9077c657876SArnaldo Carvalho de Melo return ~0; 9087c657876SArnaldo Carvalho de Melo else 9097c657876SArnaldo Carvalho de Melo return 1000000 / p; 9107c657876SArnaldo Carvalho de Melo } 9117c657876SArnaldo Carvalho de Melo 9127c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss) 9137c657876SArnaldo Carvalho de Melo { 9147c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 9157c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 9167c657876SArnaldo Carvalho de Melo 917ae6706f0SArnaldo Carvalho de Melo if (seq_loss != DCCP_MAX_SEQNO + 1 && 918ae6706f0SArnaldo Carvalho de Melo list_empty(&hcrx->ccid3hcrx_li_hist)) { 919ae6706f0SArnaldo Carvalho de Melo struct dccp_li_hist_entry *li_tail; 9207c657876SArnaldo Carvalho de Melo 921ae6706f0SArnaldo Carvalho de Melo li_tail = dccp_li_hist_interval_new(ccid3_li_hist, 922ae6706f0SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 923ae6706f0SArnaldo Carvalho de Melo seq_loss, win_loss); 9247c657876SArnaldo Carvalho de Melo if (li_tail == NULL) 925ae6706f0SArnaldo Carvalho de Melo return; 926ae6706f0SArnaldo Carvalho de Melo li_tail->dccplih_interval = ccid3_hc_rx_calc_first_li(sk); 9277c657876SArnaldo Carvalho de Melo } 9287c657876SArnaldo Carvalho de Melo /* FIXME: find end of interval */ 9297c657876SArnaldo Carvalho de Melo } 9307c657876SArnaldo Carvalho de Melo 9317c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_detect_loss(struct sock *sk) 9327c657876SArnaldo Carvalho de Melo { 9337c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 9347c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 93529e4f8b3SArnaldo Carvalho de Melo u8 win_loss; 93629e4f8b3SArnaldo Carvalho de Melo const u64 seq_loss = dccp_rx_hist_detect_loss(&hcrx->ccid3hcrx_hist, 93729e4f8b3SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, 93829e4f8b3SArnaldo Carvalho de Melo &win_loss); 9397c657876SArnaldo Carvalho de Melo 9407c657876SArnaldo Carvalho de Melo ccid3_hc_rx_update_li(sk, seq_loss, win_loss); 9417c657876SArnaldo Carvalho de Melo } 9427c657876SArnaldo Carvalho de Melo 9437c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) 9447c657876SArnaldo Carvalho de Melo { 9457c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 9467c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 9474fded33bSArnaldo Carvalho de Melo const struct dccp_options_received *opt_recv; 9488c60f3faSArnaldo Carvalho de Melo struct dccp_rx_hist_entry *packet; 9497c657876SArnaldo Carvalho de Melo struct timeval now; 9507c657876SArnaldo Carvalho de Melo u8 win_count; 9517c657876SArnaldo Carvalho de Melo u32 p_prev; 9527c657876SArnaldo Carvalho de Melo int ins; 9531f2333aeSArnaldo Carvalho de Melo 9547c657876SArnaldo Carvalho de Melo if (hcrx == NULL) 9557c657876SArnaldo Carvalho de Melo return; 9567c657876SArnaldo Carvalho de Melo 9577c657876SArnaldo Carvalho de Melo BUG_ON(!(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA || 9587c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA)); 9597c657876SArnaldo Carvalho de Melo 9604fded33bSArnaldo Carvalho de Melo opt_recv = &dp->dccps_options_received; 9614fded33bSArnaldo Carvalho de Melo 9627c657876SArnaldo Carvalho de Melo switch (DCCP_SKB_CB(skb)->dccpd_type) { 9637c657876SArnaldo Carvalho de Melo case DCCP_PKT_ACK: 9647c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA) 9657c657876SArnaldo Carvalho de Melo return; 9667c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATAACK: 9674fded33bSArnaldo Carvalho de Melo if (opt_recv->dccpor_timestamp_echo == 0) 9687c657876SArnaldo Carvalho de Melo break; 9697c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_rtt; 9707c657876SArnaldo Carvalho de Melo do_gettimeofday(&now); 971b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = timeval_usecs(&now) - 9724fded33bSArnaldo Carvalho de Melo (opt_recv->dccpor_timestamp_echo - 9734fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time) * 10; 9747c657876SArnaldo Carvalho de Melo if (p_prev != hcrx->ccid3hcrx_rtt) 9754fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n", 9764fded33bSArnaldo Carvalho de Melo dccp_role(sk), hcrx->ccid3hcrx_rtt, 9774fded33bSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time); 9787c657876SArnaldo Carvalho de Melo break; 9797c657876SArnaldo Carvalho de Melo case DCCP_PKT_DATA: 9807c657876SArnaldo Carvalho de Melo break; 9817c657876SArnaldo Carvalho de Melo default: 9827c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, not DATA/DATAACK/ACK packet(%s)\n", 9837c657876SArnaldo Carvalho de Melo dccp_role(sk), sk, 9847c657876SArnaldo Carvalho de Melo dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); 9857c657876SArnaldo Carvalho de Melo return; 9867c657876SArnaldo Carvalho de Melo } 9877c657876SArnaldo Carvalho de Melo 9884fded33bSArnaldo Carvalho de Melo packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp, 9898c60f3faSArnaldo Carvalho de Melo skb, SLAB_ATOMIC); 9907c657876SArnaldo Carvalho de Melo if (packet == NULL) { 9911f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p, Not enough mem to add rx packet " 9921f2333aeSArnaldo Carvalho de Melo "to history (consider it lost)!", 9937c657876SArnaldo Carvalho de Melo dccp_role(sk), sk); 9947c657876SArnaldo Carvalho de Melo return; 9957c657876SArnaldo Carvalho de Melo } 9967c657876SArnaldo Carvalho de Melo 997c1734376SArnaldo Carvalho de Melo win_count = packet->dccphrx_ccval; 9987c657876SArnaldo Carvalho de Melo 999072ab6c6SArnaldo Carvalho de Melo ins = dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist, 1000072ab6c6SArnaldo Carvalho de Melo &hcrx->ccid3hcrx_li_hist, packet); 10017c657876SArnaldo Carvalho de Melo 10027c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK) 10037c657876SArnaldo Carvalho de Melo return; 10047c657876SArnaldo Carvalho de Melo 10057c657876SArnaldo Carvalho de Melo switch (hcrx->ccid3hcrx_state) { 10067c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_NO_DATA: 10071f2333aeSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial " 10081f2333aeSArnaldo Carvalho de Melo "feedback\n", 10091f2333aeSArnaldo Carvalho de Melo dccp_role(sk), sk, 10101f2333aeSArnaldo Carvalho de Melo dccp_state_name(sk->sk_state), skb); 10117c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10127c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA); 10137c657876SArnaldo Carvalho de Melo return; 10147c657876SArnaldo Carvalho de Melo case TFRC_RSTATE_DATA: 10151f2333aeSArnaldo Carvalho de Melo hcrx->ccid3hcrx_bytes_recv += skb->len - 10161f2333aeSArnaldo Carvalho de Melo dccp_hdr(skb)->dccph_doff * 4; 1017b6ee3d4aSArnaldo Carvalho de Melo if (ins != 0) 1018b6ee3d4aSArnaldo Carvalho de Melo break; 1019b6ee3d4aSArnaldo Carvalho de Melo 1020b6ee3d4aSArnaldo Carvalho de Melo do_gettimeofday(&now); 1021b6ee3d4aSArnaldo Carvalho de Melo if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >= 10224fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt) { 1023b6ee3d4aSArnaldo Carvalho de Melo hcrx->ccid3hcrx_tstamp_last_ack = now; 10247c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10257c657876SArnaldo Carvalho de Melo } 10267c657876SArnaldo Carvalho de Melo return; 10277c657876SArnaldo Carvalho de Melo default: 10287c657876SArnaldo Carvalho de Melo printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n", 10297c657876SArnaldo Carvalho de Melo __FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state); 10307c657876SArnaldo Carvalho de Melo dump_stack(); 10317c657876SArnaldo Carvalho de Melo return; 10327c657876SArnaldo Carvalho de Melo } 10337c657876SArnaldo Carvalho de Melo 10347c657876SArnaldo Carvalho de Melo /* Dealing with packet loss */ 10354fded33bSArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n", 10364fded33bSArnaldo Carvalho de Melo dccp_role(sk), sk, dccp_state_name(sk->sk_state)); 10377c657876SArnaldo Carvalho de Melo 10387c657876SArnaldo Carvalho de Melo ccid3_hc_rx_detect_loss(sk); 10397c657876SArnaldo Carvalho de Melo p_prev = hcrx->ccid3hcrx_p; 10407c657876SArnaldo Carvalho de Melo 10417c657876SArnaldo Carvalho de Melo /* Calculate loss event rate */ 1042ae6706f0SArnaldo Carvalho de Melo if (!list_empty(&hcrx->ccid3hcrx_li_hist)) 10437c657876SArnaldo Carvalho de Melo /* Scaling up by 1000000 as fixed decimal */ 1044ae6706f0SArnaldo Carvalho de Melo hcrx->ccid3hcrx_p = 1000000 / dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist); 10457c657876SArnaldo Carvalho de Melo 10467c657876SArnaldo Carvalho de Melo if (hcrx->ccid3hcrx_p > p_prev) { 10477c657876SArnaldo Carvalho de Melo ccid3_hc_rx_send_feedback(sk); 10487c657876SArnaldo Carvalho de Melo return; 10497c657876SArnaldo Carvalho de Melo } 10507c657876SArnaldo Carvalho de Melo } 10517c657876SArnaldo Carvalho de Melo 10527c657876SArnaldo Carvalho de Melo static int ccid3_hc_rx_init(struct sock *sk) 10537c657876SArnaldo Carvalho de Melo { 10547c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 10557c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx; 10567c657876SArnaldo Carvalho de Melo 10577c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10587c657876SArnaldo Carvalho de Melo 10591f2333aeSArnaldo Carvalho de Melo hcrx = dp->dccps_hc_rx_ccid_private = kmalloc(sizeof(*hcrx), 10601f2333aeSArnaldo Carvalho de Melo gfp_any()); 10617c657876SArnaldo Carvalho de Melo if (hcrx == NULL) 10627c657876SArnaldo Carvalho de Melo return -ENOMEM; 10637c657876SArnaldo Carvalho de Melo 10647c657876SArnaldo Carvalho de Melo memset(hcrx, 0, sizeof(*hcrx)); 10657c657876SArnaldo Carvalho de Melo 1066a84ffe43SArnaldo Carvalho de Melo if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE && 1067a84ffe43SArnaldo Carvalho de Melo dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE) 1068a84ffe43SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = dp->dccps_packet_size; 10697c657876SArnaldo Carvalho de Melo else 10707c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE; 10717c657876SArnaldo Carvalho de Melo 10727c657876SArnaldo Carvalho de Melo hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA; 10737c657876SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist); 1074ae6706f0SArnaldo Carvalho de Melo INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist); 10754fded33bSArnaldo Carvalho de Melo /* 10764fded33bSArnaldo Carvalho de Melo * XXX this seems to be paranoid, need to think more about this, for 10774fded33bSArnaldo Carvalho de Melo * now start with something different than zero. -acme 10784fded33bSArnaldo Carvalho de Melo */ 10794fded33bSArnaldo Carvalho de Melo hcrx->ccid3hcrx_rtt = USEC_PER_SEC / 5; 10807c657876SArnaldo Carvalho de Melo return 0; 10817c657876SArnaldo Carvalho de Melo } 10827c657876SArnaldo Carvalho de Melo 10837c657876SArnaldo Carvalho de Melo static void ccid3_hc_rx_exit(struct sock *sk) 10847c657876SArnaldo Carvalho de Melo { 10857c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 10867c657876SArnaldo Carvalho de Melo struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 10877c657876SArnaldo Carvalho de Melo 10887c657876SArnaldo Carvalho de Melo ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk); 10897c657876SArnaldo Carvalho de Melo 10907c657876SArnaldo Carvalho de Melo if (hcrx == NULL) 10917c657876SArnaldo Carvalho de Melo return; 10927c657876SArnaldo Carvalho de Melo 10937c657876SArnaldo Carvalho de Melo ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); 10947c657876SArnaldo Carvalho de Melo 10957c657876SArnaldo Carvalho de Melo /* Empty packet history */ 10968c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist); 10977c657876SArnaldo Carvalho de Melo 10987c657876SArnaldo Carvalho de Melo /* Empty loss interval history */ 1099ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist); 11007c657876SArnaldo Carvalho de Melo 11017c657876SArnaldo Carvalho de Melo kfree(dp->dccps_hc_rx_ccid_private); 11027c657876SArnaldo Carvalho de Melo dp->dccps_hc_rx_ccid_private = NULL; 11037c657876SArnaldo Carvalho de Melo } 11047c657876SArnaldo Carvalho de Melo 11052babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) 11062babe1f6SArnaldo Carvalho de Melo { 11072babe1f6SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 11082babe1f6SArnaldo Carvalho de Melo const struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private; 11092babe1f6SArnaldo Carvalho de Melo 11102babe1f6SArnaldo Carvalho de Melo if (hcrx == NULL) 11112babe1f6SArnaldo Carvalho de Melo return; 11122babe1f6SArnaldo Carvalho de Melo 11132babe1f6SArnaldo Carvalho de Melo info->tcpi_ca_state = hcrx->ccid3hcrx_state; 11142babe1f6SArnaldo Carvalho de Melo info->tcpi_options |= TCPI_OPT_TIMESTAMPS; 11152babe1f6SArnaldo Carvalho de Melo info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; 11162babe1f6SArnaldo Carvalho de Melo } 11172babe1f6SArnaldo Carvalho de Melo 11182babe1f6SArnaldo Carvalho de Melo static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) 11192babe1f6SArnaldo Carvalho de Melo { 11202babe1f6SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 11212babe1f6SArnaldo Carvalho de Melo const struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private; 11222babe1f6SArnaldo Carvalho de Melo 11232babe1f6SArnaldo Carvalho de Melo if (hctx == NULL) 11242babe1f6SArnaldo Carvalho de Melo return; 11252babe1f6SArnaldo Carvalho de Melo 11262babe1f6SArnaldo Carvalho de Melo info->tcpi_rto = hctx->ccid3hctx_t_rto; 11272babe1f6SArnaldo Carvalho de Melo info->tcpi_rtt = hctx->ccid3hctx_rtt; 11282babe1f6SArnaldo Carvalho de Melo } 11292babe1f6SArnaldo Carvalho de Melo 11307c657876SArnaldo Carvalho de Melo static struct ccid ccid3 = { 11317c657876SArnaldo Carvalho de Melo .ccid_id = 3, 11327c657876SArnaldo Carvalho de Melo .ccid_name = "ccid3", 11337c657876SArnaldo Carvalho de Melo .ccid_owner = THIS_MODULE, 11347c657876SArnaldo Carvalho de Melo .ccid_init = ccid3_init, 11357c657876SArnaldo Carvalho de Melo .ccid_exit = ccid3_exit, 11367c657876SArnaldo Carvalho de Melo .ccid_hc_tx_init = ccid3_hc_tx_init, 11377c657876SArnaldo Carvalho de Melo .ccid_hc_tx_exit = ccid3_hc_tx_exit, 11387c657876SArnaldo Carvalho de Melo .ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet, 11397c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent, 11407c657876SArnaldo Carvalho de Melo .ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv, 11417c657876SArnaldo Carvalho de Melo .ccid_hc_tx_insert_options = ccid3_hc_tx_insert_options, 11427c657876SArnaldo Carvalho de Melo .ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options, 11437c657876SArnaldo Carvalho de Melo .ccid_hc_rx_init = ccid3_hc_rx_init, 11447c657876SArnaldo Carvalho de Melo .ccid_hc_rx_exit = ccid3_hc_rx_exit, 11457c657876SArnaldo Carvalho de Melo .ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options, 11467c657876SArnaldo Carvalho de Melo .ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv, 11472babe1f6SArnaldo Carvalho de Melo .ccid_hc_rx_get_info = ccid3_hc_rx_get_info, 11482babe1f6SArnaldo Carvalho de Melo .ccid_hc_tx_get_info = ccid3_hc_tx_get_info, 11497c657876SArnaldo Carvalho de Melo }; 11507c657876SArnaldo Carvalho de Melo 11517c657876SArnaldo Carvalho de Melo module_param(ccid3_debug, int, 0444); 11527c657876SArnaldo Carvalho de Melo MODULE_PARM_DESC(ccid3_debug, "Enable debug messages"); 11537c657876SArnaldo Carvalho de Melo 11547c657876SArnaldo Carvalho de Melo static __init int ccid3_module_init(void) 11557c657876SArnaldo Carvalho de Melo { 11568c60f3faSArnaldo Carvalho de Melo int rc = -ENOBUFS; 11577c657876SArnaldo Carvalho de Melo 11588c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = dccp_rx_hist_new("ccid3"); 11598c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist == NULL) 11607c657876SArnaldo Carvalho de Melo goto out; 11617c657876SArnaldo Carvalho de Melo 11628c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = dccp_tx_hist_new("ccid3"); 11638c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist == NULL) 11648c60f3faSArnaldo Carvalho de Melo goto out_free_rx; 11657c657876SArnaldo Carvalho de Melo 1166ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = dccp_li_hist_new("ccid3"); 1167ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist == NULL) 11688c60f3faSArnaldo Carvalho de Melo goto out_free_tx; 11697c657876SArnaldo Carvalho de Melo 11707c657876SArnaldo Carvalho de Melo rc = ccid_register(&ccid3); 11717c657876SArnaldo Carvalho de Melo if (rc != 0) 11727c657876SArnaldo Carvalho de Melo goto out_free_loss_interval_history; 11737c657876SArnaldo Carvalho de Melo out: 11747c657876SArnaldo Carvalho de Melo return rc; 11758c60f3faSArnaldo Carvalho de Melo 11767c657876SArnaldo Carvalho de Melo out_free_loss_interval_history: 1177ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1178ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 11798c60f3faSArnaldo Carvalho de Melo out_free_tx: 11808c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 11818c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 11828c60f3faSArnaldo Carvalho de Melo out_free_rx: 11838c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 11848c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 11857c657876SArnaldo Carvalho de Melo goto out; 11867c657876SArnaldo Carvalho de Melo } 11877c657876SArnaldo Carvalho de Melo module_init(ccid3_module_init); 11887c657876SArnaldo Carvalho de Melo 11897c657876SArnaldo Carvalho de Melo static __exit void ccid3_module_exit(void) 11907c657876SArnaldo Carvalho de Melo { 1191725ba8eeSArnaldo Carvalho de Melo #ifdef CONFIG_IP_DCCP_UNLOAD_HACK 1192725ba8eeSArnaldo Carvalho de Melo /* 1193725ba8eeSArnaldo Carvalho de Melo * Hack to use while developing, so that we get rid of the control 1194725ba8eeSArnaldo Carvalho de Melo * sock, that is what keeps a refcount on dccp.ko -acme 1195725ba8eeSArnaldo Carvalho de Melo */ 1196725ba8eeSArnaldo Carvalho de Melo extern void dccp_ctl_sock_exit(void); 1197725ba8eeSArnaldo Carvalho de Melo 1198725ba8eeSArnaldo Carvalho de Melo dccp_ctl_sock_exit(); 1199725ba8eeSArnaldo Carvalho de Melo #endif 12007c657876SArnaldo Carvalho de Melo ccid_unregister(&ccid3); 12017c657876SArnaldo Carvalho de Melo 12028c60f3faSArnaldo Carvalho de Melo if (ccid3_tx_hist != NULL) { 12038c60f3faSArnaldo Carvalho de Melo dccp_tx_hist_delete(ccid3_tx_hist); 12048c60f3faSArnaldo Carvalho de Melo ccid3_tx_hist = NULL; 12057c657876SArnaldo Carvalho de Melo } 12068c60f3faSArnaldo Carvalho de Melo if (ccid3_rx_hist != NULL) { 12078c60f3faSArnaldo Carvalho de Melo dccp_rx_hist_delete(ccid3_rx_hist); 12088c60f3faSArnaldo Carvalho de Melo ccid3_rx_hist = NULL; 12097c657876SArnaldo Carvalho de Melo } 1210ae6706f0SArnaldo Carvalho de Melo if (ccid3_li_hist != NULL) { 1211ae6706f0SArnaldo Carvalho de Melo dccp_li_hist_delete(ccid3_li_hist); 1212ae6706f0SArnaldo Carvalho de Melo ccid3_li_hist = NULL; 12137c657876SArnaldo Carvalho de Melo } 12147c657876SArnaldo Carvalho de Melo } 12157c657876SArnaldo Carvalho de Melo module_exit(ccid3_module_exit); 12167c657876SArnaldo Carvalho de Melo 12171f2333aeSArnaldo Carvalho de Melo MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz>, " 12181f2333aeSArnaldo Carvalho de Melo "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>"); 12197c657876SArnaldo Carvalho de Melo MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID"); 12207c657876SArnaldo Carvalho de Melo MODULE_LICENSE("GPL"); 12217c657876SArnaldo Carvalho de Melo MODULE_ALIAS("net-dccp-ccid-3"); 1222