Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 1 | /* |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 2 | * Copyright (c) 2005, 2006 Andrea Bittau <a.bittau@cs.ucl.ac.uk> |
| 3 | * |
| 4 | * Changes to meet Linux coding standards, and DCCP infrastructure fixes. |
| 5 | * |
| 6 | * Copyright (c) 2006 Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | */ |
| 22 | |
| 23 | /* |
Gerrit Renker | 0e64e94 | 2006-10-24 16:17:51 -0700 | [diff] [blame] | 24 | * This implementation should follow RFC 4341 |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 25 | */ |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 26 | #include <linux/slab.h> |
Gerrit Renker | e8ef967 | 2008-11-12 00:43:40 -0800 | [diff] [blame] | 27 | #include "../feat.h" |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 28 | #include "ccid2.h" |
| 29 | |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 30 | |
| 31 | #ifdef CONFIG_IP_DCCP_CCID2_DEBUG |
Rusty Russell | eb93992 | 2011-12-19 14:08:01 +0000 | [diff] [blame] | 32 | static bool ccid2_debug; |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 33 | #define ccid2_pr_debug(format, a...) DCCP_PR_DEBUG(ccid2_debug, format, ##a) |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 34 | #else |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 35 | #define ccid2_pr_debug(format, a...) |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 36 | #endif |
| 37 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 38 | static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hc) |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 39 | { |
| 40 | struct ccid2_seq *seqp; |
| 41 | int i; |
| 42 | |
| 43 | /* check if we have space to preserve the pointer to the buffer */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 44 | if (hc->tx_seqbufc >= (sizeof(hc->tx_seqbuf) / |
| 45 | sizeof(struct ccid2_seq *))) |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 46 | return -ENOMEM; |
| 47 | |
| 48 | /* allocate buffer and initialize linked list */ |
Gerrit Renker | cd1f7d3 | 2007-10-04 14:41:00 -0700 | [diff] [blame] | 49 | seqp = kmalloc(CCID2_SEQBUF_LEN * sizeof(struct ccid2_seq), gfp_any()); |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 50 | if (seqp == NULL) |
| 51 | return -ENOMEM; |
| 52 | |
Gerrit Renker | cd1f7d3 | 2007-10-04 14:41:00 -0700 | [diff] [blame] | 53 | for (i = 0; i < (CCID2_SEQBUF_LEN - 1); i++) { |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 54 | seqp[i].ccid2s_next = &seqp[i + 1]; |
| 55 | seqp[i + 1].ccid2s_prev = &seqp[i]; |
| 56 | } |
Gerrit Renker | cd1f7d3 | 2007-10-04 14:41:00 -0700 | [diff] [blame] | 57 | seqp[CCID2_SEQBUF_LEN - 1].ccid2s_next = seqp; |
| 58 | seqp->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1]; |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 59 | |
| 60 | /* This is the first allocation. Initiate the head and tail. */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 61 | if (hc->tx_seqbufc == 0) |
| 62 | hc->tx_seqh = hc->tx_seqt = seqp; |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 63 | else { |
| 64 | /* link the existing list with the one we just created */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 65 | hc->tx_seqh->ccid2s_next = seqp; |
| 66 | seqp->ccid2s_prev = hc->tx_seqh; |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 67 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 68 | hc->tx_seqt->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1]; |
| 69 | seqp[CCID2_SEQBUF_LEN - 1].ccid2s_next = hc->tx_seqt; |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | /* store the original pointer to the buffer so we can free it */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 73 | hc->tx_seqbuf[hc->tx_seqbufc] = seqp; |
| 74 | hc->tx_seqbufc++; |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 75 | |
| 76 | return 0; |
| 77 | } |
| 78 | |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 79 | static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 80 | { |
Gerrit Renker | 1c0e0a0 | 2010-10-27 19:16:28 +0000 | [diff] [blame] | 81 | if (ccid2_cwnd_network_limited(ccid2_hc_tx_sk(sk))) |
| 82 | return CCID_PACKET_WILL_DEQUEUE_LATER; |
| 83 | return CCID_PACKET_SEND_AT_ONCE; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 84 | } |
| 85 | |
Gerrit Renker | df054e1 | 2007-11-24 21:32:53 -0200 | [diff] [blame] | 86 | static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val) |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 87 | { |
Gerrit Renker | b1c00fe | 2009-10-05 00:53:10 +0000 | [diff] [blame] | 88 | u32 max_ratio = DIV_ROUND_UP(ccid2_hc_tx_sk(sk)->tx_cwnd, 2); |
Gerrit Renker | d50ad16 | 2007-11-24 21:40:24 -0200 | [diff] [blame] | 89 | |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 90 | /* |
Gerrit Renker | d50ad16 | 2007-11-24 21:40:24 -0200 | [diff] [blame] | 91 | * Ensure that Ack Ratio does not exceed ceil(cwnd/2), which is (2) from |
| 92 | * RFC 4341, 6.1.2. We ignore the statement that Ack Ratio 2 is always |
| 93 | * acceptable since this causes starvation/deadlock whenever cwnd < 2. |
| 94 | * The same problem arises when Ack Ratio is 0 (ie. Ack Ratio disabled). |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 95 | */ |
Gerrit Renker | d50ad16 | 2007-11-24 21:40:24 -0200 | [diff] [blame] | 96 | if (val == 0 || val > max_ratio) { |
| 97 | DCCP_WARN("Limiting Ack Ratio (%u) to %u\n", val, max_ratio); |
| 98 | val = max_ratio; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 99 | } |
Samuel Jero | d346d88 | 2011-07-24 20:49:19 -0600 | [diff] [blame] | 100 | dccp_feat_signal_nn_change(sk, DCCPF_ACK_RATIO, |
| 101 | min_t(u32, val, DCCPF_ACK_RATIO_MAX)); |
| 102 | } |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 103 | |
Samuel Jero | d96a9e8 | 2011-07-24 20:57:49 -0600 | [diff] [blame] | 104 | static void ccid2_check_l_ack_ratio(struct sock *sk) |
| 105 | { |
| 106 | struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk); |
| 107 | |
| 108 | /* |
| 109 | * After a loss, idle period, application limited period, or RTO we |
| 110 | * need to check that the ack ratio is still less than the congestion |
| 111 | * window. Otherwise, we will send an entire congestion window of |
| 112 | * packets and got no response because we haven't sent ack ratio |
| 113 | * packets yet. |
| 114 | * If the ack ratio does need to be reduced, we reduce it to half of |
| 115 | * the congestion window (or 1 if that's zero) instead of to the |
| 116 | * congestion window. This prevents problems if one ack is lost. |
| 117 | */ |
| 118 | if (dccp_feat_nn_get(sk, DCCPF_ACK_RATIO) > hc->tx_cwnd) |
| 119 | ccid2_change_l_ack_ratio(sk, hc->tx_cwnd/2 ? : 1U); |
| 120 | } |
| 121 | |
Samuel Jero | d346d88 | 2011-07-24 20:49:19 -0600 | [diff] [blame] | 122 | static void ccid2_change_l_seq_window(struct sock *sk, u64 val) |
| 123 | { |
| 124 | dccp_feat_signal_nn_change(sk, DCCPF_SEQUENCE_WINDOW, |
| 125 | clamp_val(val, DCCPF_SEQ_WMIN, |
| 126 | DCCPF_SEQ_WMAX)); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 127 | } |
| 128 | |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 129 | static void ccid2_hc_tx_rto_expire(unsigned long data) |
| 130 | { |
| 131 | struct sock *sk = (struct sock *)data; |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 132 | struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk); |
Gerrit Renker | 1c0e0a0 | 2010-10-27 19:16:28 +0000 | [diff] [blame] | 133 | const bool sender_was_blocked = ccid2_cwnd_network_limited(hc); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 134 | |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 135 | bh_lock_sock(sk); |
| 136 | if (sock_owned_by_user(sk)) { |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 137 | sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + HZ / 5); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 138 | goto out; |
| 139 | } |
| 140 | |
| 141 | ccid2_pr_debug("RTO_EXPIRE\n"); |
| 142 | |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 143 | /* back-off timer */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 144 | hc->tx_rto <<= 1; |
Gerrit Renker | 231cc2a | 2010-08-22 19:41:40 +0000 | [diff] [blame] | 145 | if (hc->tx_rto > DCCP_RTO_MAX) |
| 146 | hc->tx_rto = DCCP_RTO_MAX; |
Gerrit Renker | 410e27a | 2008-09-09 13:27:22 +0200 | [diff] [blame] | 147 | |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 148 | /* adjust pipe, cwnd etc */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 149 | hc->tx_ssthresh = hc->tx_cwnd / 2; |
| 150 | if (hc->tx_ssthresh < 2) |
| 151 | hc->tx_ssthresh = 2; |
Gerrit Renker | 67b67e3 | 2010-08-22 19:41:36 +0000 | [diff] [blame] | 152 | hc->tx_cwnd = 1; |
| 153 | hc->tx_pipe = 0; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 154 | |
| 155 | /* clear state about stuff we sent */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 156 | hc->tx_seqt = hc->tx_seqh; |
| 157 | hc->tx_packets_acked = 0; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 158 | |
| 159 | /* clear ack ratio state. */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 160 | hc->tx_rpseq = 0; |
| 161 | hc->tx_rpdupack = -1; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 162 | ccid2_change_l_ack_ratio(sk, 1); |
Gerrit Renker | 1c0e0a0 | 2010-10-27 19:16:28 +0000 | [diff] [blame] | 163 | |
| 164 | /* if we were blocked before, we may now send cwnd=1 packet */ |
| 165 | if (sender_was_blocked) |
| 166 | tasklet_schedule(&dccp_sk(sk)->dccps_xmitlet); |
| 167 | /* restart backed-off timer */ |
| 168 | sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 169 | out: |
| 170 | bh_unlock_sock(sk); |
Andrea Bittau | 77ff72d | 2006-03-20 17:57:52 -0800 | [diff] [blame] | 171 | sock_put(sk); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 172 | } |
| 173 | |
Gerrit Renker | 113ced1 | 2011-07-03 09:55:03 -0600 | [diff] [blame] | 174 | /* |
| 175 | * Congestion window validation (RFC 2861). |
| 176 | */ |
Rusty Russell | eb93992 | 2011-12-19 14:08:01 +0000 | [diff] [blame] | 177 | static bool ccid2_do_cwv = true; |
Gerrit Renker | 113ced1 | 2011-07-03 09:55:03 -0600 | [diff] [blame] | 178 | module_param(ccid2_do_cwv, bool, 0644); |
| 179 | MODULE_PARM_DESC(ccid2_do_cwv, "Perform RFC2861 Congestion Window Validation"); |
| 180 | |
| 181 | /** |
| 182 | * ccid2_update_used_window - Track how much of cwnd is actually used |
| 183 | * This is done in addition to CWV. The sender needs to have an idea of how many |
| 184 | * packets may be in flight, to set the local Sequence Window value accordingly |
| 185 | * (RFC 4340, 7.5.2). The CWV mechanism is exploited to keep track of the |
| 186 | * maximum-used window. We use an EWMA low-pass filter to filter out noise. |
| 187 | */ |
| 188 | static void ccid2_update_used_window(struct ccid2_hc_tx_sock *hc, u32 new_wnd) |
| 189 | { |
| 190 | hc->tx_expected_wnd = (3 * hc->tx_expected_wnd + new_wnd) / 4; |
| 191 | } |
| 192 | |
| 193 | /* This borrows the code of tcp_cwnd_application_limited() */ |
| 194 | static void ccid2_cwnd_application_limited(struct sock *sk, const u32 now) |
| 195 | { |
| 196 | struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk); |
| 197 | /* don't reduce cwnd below the initial window (IW) */ |
| 198 | u32 init_win = rfc3390_bytes_to_packets(dccp_sk(sk)->dccps_mss_cache), |
| 199 | win_used = max(hc->tx_cwnd_used, init_win); |
| 200 | |
| 201 | if (win_used < hc->tx_cwnd) { |
| 202 | hc->tx_ssthresh = max(hc->tx_ssthresh, |
| 203 | (hc->tx_cwnd >> 1) + (hc->tx_cwnd >> 2)); |
| 204 | hc->tx_cwnd = (hc->tx_cwnd + win_used) >> 1; |
| 205 | } |
| 206 | hc->tx_cwnd_used = 0; |
| 207 | hc->tx_cwnd_stamp = now; |
Samuel Jero | d96a9e8 | 2011-07-24 20:57:49 -0600 | [diff] [blame] | 208 | |
| 209 | ccid2_check_l_ack_ratio(sk); |
Gerrit Renker | 113ced1 | 2011-07-03 09:55:03 -0600 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | /* This borrows the code of tcp_cwnd_restart() */ |
| 213 | static void ccid2_cwnd_restart(struct sock *sk, const u32 now) |
| 214 | { |
| 215 | struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk); |
| 216 | u32 cwnd = hc->tx_cwnd, restart_cwnd, |
| 217 | iwnd = rfc3390_bytes_to_packets(dccp_sk(sk)->dccps_mss_cache); |
| 218 | |
| 219 | hc->tx_ssthresh = max(hc->tx_ssthresh, (cwnd >> 1) + (cwnd >> 2)); |
| 220 | |
| 221 | /* don't reduce cwnd below the initial window (IW) */ |
| 222 | restart_cwnd = min(cwnd, iwnd); |
| 223 | cwnd >>= (now - hc->tx_lsndtime) / hc->tx_rto; |
| 224 | hc->tx_cwnd = max(cwnd, restart_cwnd); |
| 225 | |
| 226 | hc->tx_cwnd_stamp = now; |
| 227 | hc->tx_cwnd_used = 0; |
Samuel Jero | d96a9e8 | 2011-07-24 20:57:49 -0600 | [diff] [blame] | 228 | |
| 229 | ccid2_check_l_ack_ratio(sk); |
Gerrit Renker | 113ced1 | 2011-07-03 09:55:03 -0600 | [diff] [blame] | 230 | } |
| 231 | |
Gerrit Renker | baf9e78 | 2010-10-11 20:37:38 +0200 | [diff] [blame] | 232 | static void ccid2_hc_tx_packet_sent(struct sock *sk, unsigned int len) |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 233 | { |
| 234 | struct dccp_sock *dp = dccp_sk(sk); |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 235 | struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk); |
Eric Dumazet | d011b9a | 2017-05-16 14:00:02 -0700 | [diff] [blame] | 236 | const u32 now = ccid2_jiffies32; |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 237 | struct ccid2_seq *next; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 238 | |
Gerrit Renker | 113ced1 | 2011-07-03 09:55:03 -0600 | [diff] [blame] | 239 | /* slow-start after idle periods (RFC 2581, RFC 2861) */ |
| 240 | if (ccid2_do_cwv && !hc->tx_pipe && |
| 241 | (s32)(now - hc->tx_lsndtime) >= hc->tx_rto) |
| 242 | ccid2_cwnd_restart(sk, now); |
| 243 | |
| 244 | hc->tx_lsndtime = now; |
| 245 | hc->tx_pipe += 1; |
| 246 | |
| 247 | /* see whether cwnd was fully used (RFC 2861), update expected window */ |
| 248 | if (ccid2_cwnd_network_limited(hc)) { |
| 249 | ccid2_update_used_window(hc, hc->tx_cwnd); |
| 250 | hc->tx_cwnd_used = 0; |
| 251 | hc->tx_cwnd_stamp = now; |
| 252 | } else { |
| 253 | if (hc->tx_pipe > hc->tx_cwnd_used) |
| 254 | hc->tx_cwnd_used = hc->tx_pipe; |
| 255 | |
| 256 | ccid2_update_used_window(hc, hc->tx_cwnd_used); |
| 257 | |
| 258 | if (ccid2_do_cwv && (s32)(now - hc->tx_cwnd_stamp) >= hc->tx_rto) |
| 259 | ccid2_cwnd_application_limited(sk, now); |
| 260 | } |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 261 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 262 | hc->tx_seqh->ccid2s_seq = dp->dccps_gss; |
| 263 | hc->tx_seqh->ccid2s_acked = 0; |
Gerrit Renker | 113ced1 | 2011-07-03 09:55:03 -0600 | [diff] [blame] | 264 | hc->tx_seqh->ccid2s_sent = now; |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 265 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 266 | next = hc->tx_seqh->ccid2s_next; |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 267 | /* check if we need to alloc more space */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 268 | if (next == hc->tx_seqt) { |
| 269 | if (ccid2_hc_tx_alloc_seq(hc)) { |
Gerrit Renker | 7d9e893 | 2007-10-04 14:41:26 -0700 | [diff] [blame] | 270 | DCCP_CRIT("packet history - out of memory!"); |
| 271 | /* FIXME: find a more graceful way to bail out */ |
| 272 | return; |
| 273 | } |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 274 | next = hc->tx_seqh->ccid2s_next; |
| 275 | BUG_ON(next == hc->tx_seqt); |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 276 | } |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 277 | hc->tx_seqh = next; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 278 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 279 | ccid2_pr_debug("cwnd=%d pipe=%d\n", hc->tx_cwnd, hc->tx_pipe); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 280 | |
Gerrit Renker | 900bfed | 2007-11-24 21:58:33 -0200 | [diff] [blame] | 281 | /* |
| 282 | * FIXME: The code below is broken and the variables have been removed |
| 283 | * from the socket struct. The `ackloss' variable was always set to 0, |
| 284 | * and with arsent there are several problems: |
| 285 | * (i) it doesn't just count the number of Acks, but all sent packets; |
| 286 | * (ii) it is expressed in # of packets, not # of windows, so the |
| 287 | * comparison below uses the wrong formula: Appendix A of RFC 4341 |
| 288 | * comes up with the number K = cwnd / (R^2 - R) of consecutive windows |
| 289 | * of data with no lost or marked Ack packets. If arsent were the # of |
| 290 | * consecutive Acks received without loss, then Ack Ratio needs to be |
| 291 | * decreased by 1 when |
| 292 | * arsent >= K * cwnd / R = cwnd^2 / (R^3 - R^2) |
| 293 | * where cwnd / R is the number of Acks received per window of data |
| 294 | * (cf. RFC 4341, App. A). The problems are that |
| 295 | * - arsent counts other packets as well; |
| 296 | * - the comparison uses a formula different from RFC 4341; |
| 297 | * - computing a cubic/quadratic equation each time is too complicated. |
| 298 | * Hence a different algorithm is needed. |
| 299 | */ |
| 300 | #if 0 |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 301 | /* Ack Ratio. Need to maintain a concept of how many windows we sent */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 302 | hc->tx_arsent++; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 303 | /* We had an ack loss in this window... */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 304 | if (hc->tx_ackloss) { |
| 305 | if (hc->tx_arsent >= hc->tx_cwnd) { |
| 306 | hc->tx_arsent = 0; |
| 307 | hc->tx_ackloss = 0; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 308 | } |
Arnaldo Carvalho de Melo | c0c736d | 2006-03-20 22:05:37 -0800 | [diff] [blame] | 309 | } else { |
| 310 | /* No acks lost up to now... */ |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 311 | /* decrease ack ratio if enough packets were sent */ |
| 312 | if (dp->dccps_l_ack_ratio > 1) { |
| 313 | /* XXX don't calculate denominator each time */ |
Arnaldo Carvalho de Melo | c0c736d | 2006-03-20 22:05:37 -0800 | [diff] [blame] | 314 | int denom = dp->dccps_l_ack_ratio * dp->dccps_l_ack_ratio - |
| 315 | dp->dccps_l_ack_ratio; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 316 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 317 | denom = hc->tx_cwnd * hc->tx_cwnd / denom; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 318 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 319 | if (hc->tx_arsent >= denom) { |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 320 | ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio - 1); |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 321 | hc->tx_arsent = 0; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 322 | } |
Arnaldo Carvalho de Melo | c0c736d | 2006-03-20 22:05:37 -0800 | [diff] [blame] | 323 | } else { |
| 324 | /* we can't increase ack ratio further [1] */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 325 | hc->tx_arsent = 0; /* or maybe set it to cwnd*/ |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 326 | } |
| 327 | } |
Gerrit Renker | 900bfed | 2007-11-24 21:58:33 -0200 | [diff] [blame] | 328 | #endif |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 329 | |
Gerrit Renker | d26eeb0 | 2010-08-29 19:23:11 +0000 | [diff] [blame] | 330 | sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto); |
Arnaldo Carvalho de Melo | c0c736d | 2006-03-20 22:05:37 -0800 | [diff] [blame] | 331 | |
Andrea Bittau | 8d424f6 | 2006-09-19 13:12:44 -0700 | [diff] [blame] | 332 | #ifdef CONFIG_IP_DCCP_CCID2_DEBUG |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 333 | do { |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 334 | struct ccid2_seq *seqp = hc->tx_seqt; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 335 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 336 | while (seqp != hc->tx_seqh) { |
Gerrit Renker | d82b6f8 | 2010-08-29 19:23:10 +0000 | [diff] [blame] | 337 | ccid2_pr_debug("out seq=%llu acked=%d time=%u\n", |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 338 | (unsigned long long)seqp->ccid2s_seq, |
Randy Dunlap | 234af48 | 2006-10-29 16:03:30 -0800 | [diff] [blame] | 339 | seqp->ccid2s_acked, seqp->ccid2s_sent); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 340 | seqp = seqp->ccid2s_next; |
| 341 | } |
Arnaldo Carvalho de Melo | c0c736d | 2006-03-20 22:05:37 -0800 | [diff] [blame] | 342 | } while (0); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 343 | ccid2_pr_debug("=========\n"); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 344 | #endif |
| 345 | } |
| 346 | |
Gerrit Renker | 231cc2a | 2010-08-22 19:41:40 +0000 | [diff] [blame] | 347 | /** |
| 348 | * ccid2_rtt_estimator - Sample RTT and compute RTO using RFC2988 algorithm |
| 349 | * This code is almost identical with TCP's tcp_rtt_estimator(), since |
| 350 | * - it has a higher sampling frequency (recommended by RFC 1323), |
| 351 | * - the RTO does not collapse into RTT due to RTTVAR going towards zero, |
| 352 | * - it is simple (cf. more complex proposals such as Eifel timer or research |
| 353 | * which suggests that the gain should be set according to window size), |
| 354 | * - in tests it was found to work well with CCID2 [gerrit]. |
| 355 | */ |
| 356 | static void ccid2_rtt_estimator(struct sock *sk, const long mrtt) |
| 357 | { |
| 358 | struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk); |
| 359 | long m = mrtt ? : 1; |
| 360 | |
| 361 | if (hc->tx_srtt == 0) { |
| 362 | /* First measurement m */ |
| 363 | hc->tx_srtt = m << 3; |
| 364 | hc->tx_mdev = m << 1; |
| 365 | |
Gerrit Renker | 4886fca | 2010-08-29 19:23:13 +0000 | [diff] [blame] | 366 | hc->tx_mdev_max = max(hc->tx_mdev, tcp_rto_min(sk)); |
Gerrit Renker | 231cc2a | 2010-08-22 19:41:40 +0000 | [diff] [blame] | 367 | hc->tx_rttvar = hc->tx_mdev_max; |
Gerrit Renker | 4886fca | 2010-08-29 19:23:13 +0000 | [diff] [blame] | 368 | |
Gerrit Renker | 231cc2a | 2010-08-22 19:41:40 +0000 | [diff] [blame] | 369 | hc->tx_rtt_seq = dccp_sk(sk)->dccps_gss; |
| 370 | } else { |
| 371 | /* Update scaled SRTT as SRTT += 1/8 * (m - SRTT) */ |
| 372 | m -= (hc->tx_srtt >> 3); |
| 373 | hc->tx_srtt += m; |
| 374 | |
| 375 | /* Similarly, update scaled mdev with regard to |m| */ |
| 376 | if (m < 0) { |
| 377 | m = -m; |
| 378 | m -= (hc->tx_mdev >> 2); |
| 379 | /* |
| 380 | * This neutralises RTO increase when RTT < SRTT - mdev |
| 381 | * (see P. Sarolahti, A. Kuznetsov,"Congestion Control |
| 382 | * in Linux TCP", USENIX 2002, pp. 49-62). |
| 383 | */ |
| 384 | if (m > 0) |
| 385 | m >>= 3; |
| 386 | } else { |
| 387 | m -= (hc->tx_mdev >> 2); |
| 388 | } |
| 389 | hc->tx_mdev += m; |
| 390 | |
| 391 | if (hc->tx_mdev > hc->tx_mdev_max) { |
| 392 | hc->tx_mdev_max = hc->tx_mdev; |
| 393 | if (hc->tx_mdev_max > hc->tx_rttvar) |
| 394 | hc->tx_rttvar = hc->tx_mdev_max; |
| 395 | } |
| 396 | |
| 397 | /* |
| 398 | * Decay RTTVAR at most once per flight, exploiting that |
| 399 | * 1) pipe <= cwnd <= Sequence_Window = W (RFC 4340, 7.5.2) |
| 400 | * 2) AWL = GSS-W+1 <= GAR <= GSS (RFC 4340, 7.5.1) |
| 401 | * GAR is a useful bound for FlightSize = pipe. |
| 402 | * AWL is probably too low here, as it over-estimates pipe. |
| 403 | */ |
| 404 | if (after48(dccp_sk(sk)->dccps_gar, hc->tx_rtt_seq)) { |
| 405 | if (hc->tx_mdev_max < hc->tx_rttvar) |
| 406 | hc->tx_rttvar -= (hc->tx_rttvar - |
| 407 | hc->tx_mdev_max) >> 2; |
| 408 | hc->tx_rtt_seq = dccp_sk(sk)->dccps_gss; |
Gerrit Renker | 4886fca | 2010-08-29 19:23:13 +0000 | [diff] [blame] | 409 | hc->tx_mdev_max = tcp_rto_min(sk); |
Gerrit Renker | 231cc2a | 2010-08-22 19:41:40 +0000 | [diff] [blame] | 410 | } |
| 411 | } |
| 412 | |
| 413 | /* |
| 414 | * Set RTO from SRTT and RTTVAR |
| 415 | * As in TCP, 4 * RTTVAR >= TCP_RTO_MIN, giving a minimum RTO of 200 ms. |
| 416 | * This agrees with RFC 4341, 5: |
| 417 | * "Because DCCP does not retransmit data, DCCP does not require |
| 418 | * TCP's recommended minimum timeout of one second". |
| 419 | */ |
| 420 | hc->tx_rto = (hc->tx_srtt >> 3) + hc->tx_rttvar; |
| 421 | |
| 422 | if (hc->tx_rto > DCCP_RTO_MAX) |
| 423 | hc->tx_rto = DCCP_RTO_MAX; |
| 424 | } |
| 425 | |
| 426 | static void ccid2_new_ack(struct sock *sk, struct ccid2_seq *seqp, |
| 427 | unsigned int *maxincr) |
Gerrit Renker | 410e27a | 2008-09-09 13:27:22 +0200 | [diff] [blame] | 428 | { |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 429 | struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk); |
Samuel Jero | d346d88 | 2011-07-24 20:49:19 -0600 | [diff] [blame] | 430 | struct dccp_sock *dp = dccp_sk(sk); |
| 431 | int r_seq_used = hc->tx_cwnd / dp->dccps_l_ack_ratio; |
Gerrit Renker | 410e27a | 2008-09-09 13:27:22 +0200 | [diff] [blame] | 432 | |
Samuel Jero | d346d88 | 2011-07-24 20:49:19 -0600 | [diff] [blame] | 433 | if (hc->tx_cwnd < dp->dccps_l_seq_win && |
| 434 | r_seq_used < dp->dccps_r_seq_win) { |
| 435 | if (hc->tx_cwnd < hc->tx_ssthresh) { |
Samuel Jero | 0ce95dc7 | 2011-07-24 21:05:16 -0600 | [diff] [blame] | 436 | if (*maxincr > 0 && ++hc->tx_packets_acked >= 2) { |
Samuel Jero | d346d88 | 2011-07-24 20:49:19 -0600 | [diff] [blame] | 437 | hc->tx_cwnd += 1; |
| 438 | *maxincr -= 1; |
| 439 | hc->tx_packets_acked = 0; |
| 440 | } |
| 441 | } else if (++hc->tx_packets_acked >= hc->tx_cwnd) { |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 442 | hc->tx_cwnd += 1; |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 443 | hc->tx_packets_acked = 0; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 444 | } |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 445 | } |
Samuel Jero | d346d88 | 2011-07-24 20:49:19 -0600 | [diff] [blame] | 446 | |
| 447 | /* |
| 448 | * Adjust the local sequence window and the ack ratio to allow about |
| 449 | * 5 times the number of packets in the network (RFC 4340 7.5.2) |
| 450 | */ |
| 451 | if (r_seq_used * CCID2_WIN_CHANGE_FACTOR >= dp->dccps_r_seq_win) |
| 452 | ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio * 2); |
| 453 | else if (r_seq_used * CCID2_WIN_CHANGE_FACTOR < dp->dccps_r_seq_win/2) |
| 454 | ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio / 2 ? : 1U); |
| 455 | |
| 456 | if (hc->tx_cwnd * CCID2_WIN_CHANGE_FACTOR >= dp->dccps_l_seq_win) |
| 457 | ccid2_change_l_seq_window(sk, dp->dccps_l_seq_win * 2); |
| 458 | else if (hc->tx_cwnd * CCID2_WIN_CHANGE_FACTOR < dp->dccps_l_seq_win/2) |
| 459 | ccid2_change_l_seq_window(sk, dp->dccps_l_seq_win / 2); |
| 460 | |
Gerrit Renker | 231cc2a | 2010-08-22 19:41:40 +0000 | [diff] [blame] | 461 | /* |
| 462 | * FIXME: RTT is sampled several times per acknowledgment (for each |
| 463 | * entry in the Ack Vector), instead of once per Ack (as in TCP SACK). |
| 464 | * This causes the RTT to be over-estimated, since the older entries |
| 465 | * in the Ack Vector have earlier sending times. |
| 466 | * The cleanest solution is to not use the ccid2s_sent field at all |
| 467 | * and instead use DCCP timestamps: requires changes in other places. |
| 468 | */ |
Eric Dumazet | d011b9a | 2017-05-16 14:00:02 -0700 | [diff] [blame] | 469 | ccid2_rtt_estimator(sk, ccid2_jiffies32 - seqp->ccid2s_sent); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 470 | } |
| 471 | |
Gerrit Renker | d50ad16 | 2007-11-24 21:40:24 -0200 | [diff] [blame] | 472 | static void ccid2_congestion_event(struct sock *sk, struct ccid2_seq *seqp) |
Andrea Bittau | 374bcf3 | 2006-09-19 13:14:43 -0700 | [diff] [blame] | 473 | { |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 474 | struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk); |
Gerrit Renker | d50ad16 | 2007-11-24 21:40:24 -0200 | [diff] [blame] | 475 | |
Gerrit Renker | d82b6f8 | 2010-08-29 19:23:10 +0000 | [diff] [blame] | 476 | if ((s32)(seqp->ccid2s_sent - hc->tx_last_cong) < 0) { |
Andrea Bittau | 374bcf3 | 2006-09-19 13:14:43 -0700 | [diff] [blame] | 477 | ccid2_pr_debug("Multiple losses in an RTT---treating as one\n"); |
| 478 | return; |
| 479 | } |
| 480 | |
Eric Dumazet | d011b9a | 2017-05-16 14:00:02 -0700 | [diff] [blame] | 481 | hc->tx_last_cong = ccid2_jiffies32; |
Andrea Bittau | 374bcf3 | 2006-09-19 13:14:43 -0700 | [diff] [blame] | 482 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 483 | hc->tx_cwnd = hc->tx_cwnd / 2 ? : 1U; |
| 484 | hc->tx_ssthresh = max(hc->tx_cwnd, 2U); |
Gerrit Renker | d50ad16 | 2007-11-24 21:40:24 -0200 | [diff] [blame] | 485 | |
Samuel Jero | d96a9e8 | 2011-07-24 20:57:49 -0600 | [diff] [blame] | 486 | ccid2_check_l_ack_ratio(sk); |
Gerrit Renker | c8bf462 | 2008-09-04 07:30:19 +0200 | [diff] [blame] | 487 | } |
| 488 | |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 489 | static int ccid2_hc_tx_parse_options(struct sock *sk, u8 packet_type, |
| 490 | u8 option, u8 *optval, u8 optlen) |
| 491 | { |
| 492 | struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk); |
| 493 | |
| 494 | switch (option) { |
| 495 | case DCCPO_ACK_VECTOR_0: |
| 496 | case DCCPO_ACK_VECTOR_1: |
| 497 | return dccp_ackvec_parsed_add(&hc->tx_av_chunks, optval, optlen, |
| 498 | option - DCCPO_ACK_VECTOR_0); |
| 499 | } |
| 500 | return 0; |
| 501 | } |
| 502 | |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 503 | static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 504 | { |
| 505 | struct dccp_sock *dp = dccp_sk(sk); |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 506 | struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk); |
Gerrit Renker | 1c0e0a0 | 2010-10-27 19:16:28 +0000 | [diff] [blame] | 507 | const bool sender_was_blocked = ccid2_cwnd_network_limited(hc); |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 508 | struct dccp_ackvec_parsed *avp; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 509 | u64 ackno, seqno; |
| 510 | struct ccid2_seq *seqp; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 511 | int done = 0; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 512 | unsigned int maxincr = 0; |
| 513 | |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 514 | /* check reverse path congestion */ |
| 515 | seqno = DCCP_SKB_CB(skb)->dccpd_seq; |
| 516 | |
| 517 | /* XXX this whole "algorithm" is broken. Need to fix it to keep track |
| 518 | * of the seqnos of the dupacks so that rpseq and rpdupack are correct |
| 519 | * -sorbo. |
| 520 | */ |
| 521 | /* need to bootstrap */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 522 | if (hc->tx_rpdupack == -1) { |
| 523 | hc->tx_rpdupack = 0; |
| 524 | hc->tx_rpseq = seqno; |
Arnaldo Carvalho de Melo | c0c736d | 2006-03-20 22:05:37 -0800 | [diff] [blame] | 525 | } else { |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 526 | /* check if packet is consecutive */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 527 | if (dccp_delta_seqno(hc->tx_rpseq, seqno) == 1) |
| 528 | hc->tx_rpseq = seqno; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 529 | /* it's a later packet */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 530 | else if (after48(seqno, hc->tx_rpseq)) { |
| 531 | hc->tx_rpdupack++; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 532 | |
| 533 | /* check if we got enough dupacks */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 534 | if (hc->tx_rpdupack >= NUMDUPACK) { |
| 535 | hc->tx_rpdupack = -1; /* XXX lame */ |
| 536 | hc->tx_rpseq = 0; |
Gerrit Renker | 31daf03 | 2011-07-24 21:18:25 -0600 | [diff] [blame] | 537 | #ifdef __CCID2_COPES_GRACEFULLY_WITH_ACK_CONGESTION_CONTROL__ |
| 538 | /* |
| 539 | * FIXME: Ack Congestion Control is broken; in |
| 540 | * the current state instabilities occurred with |
| 541 | * Ack Ratios greater than 1; causing hang-ups |
| 542 | * and long RTO timeouts. This needs to be fixed |
| 543 | * before opening up dynamic changes. -- gerrit |
| 544 | */ |
Gerrit Renker | df054e1 | 2007-11-24 21:32:53 -0200 | [diff] [blame] | 545 | ccid2_change_l_ack_ratio(sk, 2 * dp->dccps_l_ack_ratio); |
Gerrit Renker | 31daf03 | 2011-07-24 21:18:25 -0600 | [diff] [blame] | 546 | #endif |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 547 | } |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | /* check forward path congestion */ |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 552 | if (dccp_packet_without_ack(skb)) |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 553 | return; |
| 554 | |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 555 | /* still didn't send out new data packets */ |
| 556 | if (hc->tx_seqh == hc->tx_seqt) |
| 557 | goto done; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 558 | |
| 559 | ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq; |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 560 | if (after48(ackno, hc->tx_high_ack)) |
| 561 | hc->tx_high_ack = ackno; |
Andrea Bittau | 32aac18 | 2006-11-16 14:28:40 -0200 | [diff] [blame] | 562 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 563 | seqp = hc->tx_seqt; |
Andrea Bittau | 32aac18 | 2006-11-16 14:28:40 -0200 | [diff] [blame] | 564 | while (before48(seqp->ccid2s_seq, ackno)) { |
| 565 | seqp = seqp->ccid2s_next; |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 566 | if (seqp == hc->tx_seqh) { |
| 567 | seqp = hc->tx_seqh->ccid2s_prev; |
Andrea Bittau | 32aac18 | 2006-11-16 14:28:40 -0200 | [diff] [blame] | 568 | break; |
| 569 | } |
| 570 | } |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 571 | |
Gerrit Renker | a302002 | 2007-11-24 22:10:29 -0200 | [diff] [blame] | 572 | /* |
| 573 | * In slow-start, cwnd can increase up to a maximum of Ack Ratio/2 |
| 574 | * packets per acknowledgement. Rounding up avoids that cwnd is not |
| 575 | * advanced when Ack Ratio is 1 and gives a slight edge otherwise. |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 576 | */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 577 | if (hc->tx_cwnd < hc->tx_ssthresh) |
Gerrit Renker | a302002 | 2007-11-24 22:10:29 -0200 | [diff] [blame] | 578 | maxincr = DIV_ROUND_UP(dp->dccps_l_ack_ratio, 2); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 579 | |
| 580 | /* go through all ack vectors */ |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 581 | list_for_each_entry(avp, &hc->tx_av_chunks, node) { |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 582 | /* go through this ack vector */ |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 583 | for (; avp->len--; avp->vec++) { |
| 584 | u64 ackno_end_rl = SUB48(ackno, |
| 585 | dccp_ackvec_runlen(avp->vec)); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 586 | |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 587 | ccid2_pr_debug("ackvec %llu |%u,%u|\n", |
Randy Dunlap | 234af48 | 2006-10-29 16:03:30 -0800 | [diff] [blame] | 588 | (unsigned long long)ackno, |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 589 | dccp_ackvec_state(avp->vec) >> 6, |
| 590 | dccp_ackvec_runlen(avp->vec)); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 591 | /* if the seqno we are analyzing is larger than the |
| 592 | * current ackno, then move towards the tail of our |
| 593 | * seqnos. |
| 594 | */ |
| 595 | while (after48(seqp->ccid2s_seq, ackno)) { |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 596 | if (seqp == hc->tx_seqt) { |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 597 | done = 1; |
| 598 | break; |
| 599 | } |
| 600 | seqp = seqp->ccid2s_prev; |
| 601 | } |
| 602 | if (done) |
| 603 | break; |
| 604 | |
| 605 | /* check all seqnos in the range of the vector |
| 606 | * run length |
| 607 | */ |
| 608 | while (between48(seqp->ccid2s_seq,ackno_end_rl,ackno)) { |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 609 | const u8 state = dccp_ackvec_state(avp->vec); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 610 | |
| 611 | /* new packet received or marked */ |
Gerrit Renker | f17a37c | 2010-11-10 21:20:07 +0100 | [diff] [blame] | 612 | if (state != DCCPAV_NOT_RECEIVED && |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 613 | !seqp->ccid2s_acked) { |
Gerrit Renker | f17a37c | 2010-11-10 21:20:07 +0100 | [diff] [blame] | 614 | if (state == DCCPAV_ECN_MARKED) |
Gerrit Renker | d50ad16 | 2007-11-24 21:40:24 -0200 | [diff] [blame] | 615 | ccid2_congestion_event(sk, |
Andrea Bittau | 374bcf3 | 2006-09-19 13:14:43 -0700 | [diff] [blame] | 616 | seqp); |
Gerrit Renker | f17a37c | 2010-11-10 21:20:07 +0100 | [diff] [blame] | 617 | else |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 618 | ccid2_new_ack(sk, seqp, |
| 619 | &maxincr); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 620 | |
| 621 | seqp->ccid2s_acked = 1; |
| 622 | ccid2_pr_debug("Got ack for %llu\n", |
Randy Dunlap | 234af48 | 2006-10-29 16:03:30 -0800 | [diff] [blame] | 623 | (unsigned long long)seqp->ccid2s_seq); |
Gerrit Renker | c38c92a | 2010-08-22 19:41:39 +0000 | [diff] [blame] | 624 | hc->tx_pipe--; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 625 | } |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 626 | if (seqp == hc->tx_seqt) { |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 627 | done = 1; |
| 628 | break; |
| 629 | } |
Gerrit Renker | 3de5489 | 2007-11-24 20:37:48 -0200 | [diff] [blame] | 630 | seqp = seqp->ccid2s_prev; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 631 | } |
| 632 | if (done) |
| 633 | break; |
| 634 | |
Gerrit Renker | cfbbeab | 2007-11-24 20:43:59 -0200 | [diff] [blame] | 635 | ackno = SUB48(ackno_end_rl, 1); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 636 | } |
| 637 | if (done) |
| 638 | break; |
| 639 | } |
| 640 | |
| 641 | /* The state about what is acked should be correct now |
| 642 | * Check for NUMDUPACK |
| 643 | */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 644 | seqp = hc->tx_seqt; |
| 645 | while (before48(seqp->ccid2s_seq, hc->tx_high_ack)) { |
Andrea Bittau | 32aac18 | 2006-11-16 14:28:40 -0200 | [diff] [blame] | 646 | seqp = seqp->ccid2s_next; |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 647 | if (seqp == hc->tx_seqh) { |
| 648 | seqp = hc->tx_seqh->ccid2s_prev; |
Andrea Bittau | 32aac18 | 2006-11-16 14:28:40 -0200 | [diff] [blame] | 649 | break; |
| 650 | } |
| 651 | } |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 652 | done = 0; |
| 653 | while (1) { |
| 654 | if (seqp->ccid2s_acked) { |
| 655 | done++; |
Gerrit Renker | 63df18a | 2007-11-24 22:04:35 -0200 | [diff] [blame] | 656 | if (done == NUMDUPACK) |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 657 | break; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 658 | } |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 659 | if (seqp == hc->tx_seqt) |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 660 | break; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 661 | seqp = seqp->ccid2s_prev; |
| 662 | } |
| 663 | |
| 664 | /* If there are at least 3 acknowledgements, anything unacknowledged |
| 665 | * below the last sequence number is considered lost |
| 666 | */ |
Gerrit Renker | 63df18a | 2007-11-24 22:04:35 -0200 | [diff] [blame] | 667 | if (done == NUMDUPACK) { |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 668 | struct ccid2_seq *last_acked = seqp; |
| 669 | |
| 670 | /* check for lost packets */ |
| 671 | while (1) { |
| 672 | if (!seqp->ccid2s_acked) { |
Andrea Bittau | 374bcf3 | 2006-09-19 13:14:43 -0700 | [diff] [blame] | 673 | ccid2_pr_debug("Packet lost: %llu\n", |
Randy Dunlap | 234af48 | 2006-10-29 16:03:30 -0800 | [diff] [blame] | 674 | (unsigned long long)seqp->ccid2s_seq); |
Andrea Bittau | 374bcf3 | 2006-09-19 13:14:43 -0700 | [diff] [blame] | 675 | /* XXX need to traverse from tail -> head in |
| 676 | * order to detect multiple congestion events in |
| 677 | * one ack vector. |
| 678 | */ |
Gerrit Renker | d50ad16 | 2007-11-24 21:40:24 -0200 | [diff] [blame] | 679 | ccid2_congestion_event(sk, seqp); |
Gerrit Renker | c38c92a | 2010-08-22 19:41:39 +0000 | [diff] [blame] | 680 | hc->tx_pipe--; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 681 | } |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 682 | if (seqp == hc->tx_seqt) |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 683 | break; |
| 684 | seqp = seqp->ccid2s_prev; |
| 685 | } |
| 686 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 687 | hc->tx_seqt = last_acked; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 688 | } |
| 689 | |
| 690 | /* trim acked packets in tail */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 691 | while (hc->tx_seqt != hc->tx_seqh) { |
| 692 | if (!hc->tx_seqt->ccid2s_acked) |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 693 | break; |
| 694 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 695 | hc->tx_seqt = hc->tx_seqt->ccid2s_next; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 696 | } |
Gerrit Renker | c38c92a | 2010-08-22 19:41:39 +0000 | [diff] [blame] | 697 | |
| 698 | /* restart RTO timer if not all outstanding data has been acked */ |
| 699 | if (hc->tx_pipe == 0) |
| 700 | sk_stop_timer(sk, &hc->tx_rtotimer); |
| 701 | else |
| 702 | sk_reset_timer(sk, &hc->tx_rtotimer, jiffies + hc->tx_rto); |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 703 | done: |
Gerrit Renker | 1c0e0a0 | 2010-10-27 19:16:28 +0000 | [diff] [blame] | 704 | /* check if incoming Acks allow pending packets to be sent */ |
| 705 | if (sender_was_blocked && !ccid2_cwnd_network_limited(hc)) |
| 706 | tasklet_schedule(&dccp_sk(sk)->dccps_xmitlet); |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 707 | dccp_ackvec_parsed_cleanup(&hc->tx_av_chunks); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 708 | } |
| 709 | |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 710 | static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk) |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 711 | { |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 712 | struct ccid2_hc_tx_sock *hc = ccid_priv(ccid); |
Gerrit Renker | b00d2bb | 2007-11-24 21:44:30 -0200 | [diff] [blame] | 713 | struct dccp_sock *dp = dccp_sk(sk); |
| 714 | u32 max_ratio; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 715 | |
Gerrit Renker | b00d2bb | 2007-11-24 21:44:30 -0200 | [diff] [blame] | 716 | /* RFC 4341, 5: initialise ssthresh to arbitrarily high (max) value */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 717 | hc->tx_ssthresh = ~0U; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 718 | |
Gerrit Renker | 22b71c8 | 2010-08-29 19:23:12 +0000 | [diff] [blame] | 719 | /* Use larger initial windows (RFC 4341, section 5). */ |
| 720 | hc->tx_cwnd = rfc3390_bytes_to_packets(dp->dccps_mss_cache); |
Gerrit Renker | 113ced1 | 2011-07-03 09:55:03 -0600 | [diff] [blame] | 721 | hc->tx_expected_wnd = hc->tx_cwnd; |
Gerrit Renker | b00d2bb | 2007-11-24 21:44:30 -0200 | [diff] [blame] | 722 | |
| 723 | /* Make sure that Ack Ratio is enabled and within bounds. */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 724 | max_ratio = DIV_ROUND_UP(hc->tx_cwnd, 2); |
Gerrit Renker | b00d2bb | 2007-11-24 21:44:30 -0200 | [diff] [blame] | 725 | if (dp->dccps_l_ack_ratio == 0 || dp->dccps_l_ack_ratio > max_ratio) |
| 726 | dp->dccps_l_ack_ratio = max_ratio; |
| 727 | |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 728 | /* XXX init ~ to window size... */ |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 729 | if (ccid2_hc_tx_alloc_seq(hc)) |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 730 | return -ENOMEM; |
Arnaldo Carvalho de Melo | 91f0ebf | 2006-03-20 19:21:44 -0800 | [diff] [blame] | 731 | |
Gerrit Renker | 231cc2a | 2010-08-22 19:41:40 +0000 | [diff] [blame] | 732 | hc->tx_rto = DCCP_TIMEOUT_INIT; |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 733 | hc->tx_rpdupack = -1; |
Eric Dumazet | d011b9a | 2017-05-16 14:00:02 -0700 | [diff] [blame] | 734 | hc->tx_last_cong = hc->tx_lsndtime = hc->tx_cwnd_stamp = ccid2_jiffies32; |
Gerrit Renker | 113ced1 | 2011-07-03 09:55:03 -0600 | [diff] [blame] | 735 | hc->tx_cwnd_used = 0; |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 736 | setup_timer(&hc->tx_rtotimer, ccid2_hc_tx_rto_expire, |
Gerrit Renker | 410e27a | 2008-09-09 13:27:22 +0200 | [diff] [blame] | 737 | (unsigned long)sk); |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 738 | INIT_LIST_HEAD(&hc->tx_av_chunks); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 739 | return 0; |
| 740 | } |
| 741 | |
| 742 | static void ccid2_hc_tx_exit(struct sock *sk) |
| 743 | { |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 744 | struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk); |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 745 | int i; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 746 | |
Gerrit Renker | d26eeb0 | 2010-08-29 19:23:11 +0000 | [diff] [blame] | 747 | sk_stop_timer(sk, &hc->tx_rtotimer); |
Andrea Bittau | 07978aa | 2006-09-19 13:13:37 -0700 | [diff] [blame] | 748 | |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 749 | for (i = 0; i < hc->tx_seqbufc; i++) |
| 750 | kfree(hc->tx_seqbuf[i]); |
| 751 | hc->tx_seqbufc = 0; |
Hannes Frederic Sowa | 72ef9c4 | 2017-03-13 00:01:30 +0100 | [diff] [blame] | 752 | dccp_ackvec_parsed_cleanup(&hc->tx_av_chunks); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 753 | } |
| 754 | |
| 755 | static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) |
| 756 | { |
Gerrit Renker | 77d2dd9 | 2009-10-05 00:53:12 +0000 | [diff] [blame] | 757 | struct ccid2_hc_rx_sock *hc = ccid2_hc_rx_sk(sk); |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 758 | |
Gerrit Renker | 58fdea0 | 2011-07-03 09:53:12 -0600 | [diff] [blame] | 759 | if (!dccp_data_packet(skb)) |
| 760 | return; |
| 761 | |
| 762 | if (++hc->rx_num_data_pkts >= dccp_sk(sk)->dccps_r_ack_ratio) { |
| 763 | dccp_send_ack(sk); |
| 764 | hc->rx_num_data_pkts = 0; |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 765 | } |
| 766 | } |
| 767 | |
Gerrit Renker | ddebc97 | 2009-01-04 21:42:53 -0800 | [diff] [blame] | 768 | struct ccid_operations ccid2_ops = { |
Gerrit Renker | 7e87fe8 | 2010-11-14 17:26:13 +0100 | [diff] [blame] | 769 | .ccid_id = DCCPC_CCID2, |
| 770 | .ccid_name = "TCP-like", |
| 771 | .ccid_hc_tx_obj_size = sizeof(struct ccid2_hc_tx_sock), |
| 772 | .ccid_hc_tx_init = ccid2_hc_tx_init, |
| 773 | .ccid_hc_tx_exit = ccid2_hc_tx_exit, |
| 774 | .ccid_hc_tx_send_packet = ccid2_hc_tx_send_packet, |
| 775 | .ccid_hc_tx_packet_sent = ccid2_hc_tx_packet_sent, |
| 776 | .ccid_hc_tx_parse_options = ccid2_hc_tx_parse_options, |
| 777 | .ccid_hc_tx_packet_recv = ccid2_hc_tx_packet_recv, |
| 778 | .ccid_hc_rx_obj_size = sizeof(struct ccid2_hc_rx_sock), |
| 779 | .ccid_hc_rx_packet_recv = ccid2_hc_rx_packet_recv, |
Andrea Bittau | 2a91aa3 | 2006-03-20 17:41:47 -0800 | [diff] [blame] | 780 | }; |
| 781 | |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 782 | #ifdef CONFIG_IP_DCCP_CCID2_DEBUG |
Gerrit Renker | 4326499 | 2008-08-23 13:28:27 +0200 | [diff] [blame] | 783 | module_param(ccid2_debug, bool, 0644); |
Gerrit Renker | ddebc97 | 2009-01-04 21:42:53 -0800 | [diff] [blame] | 784 | MODULE_PARM_DESC(ccid2_debug, "Enable CCID-2 debug messages"); |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 785 | #endif |