Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 1 | /* Copied from tbf.cpp |
| 2 | * |
| 3 | * Copyright (C) 2012 Ivan Klyuchnikov |
| 4 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 5 | * Copyright (C) 2013 by Holger Hans Peter Freyther |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version 2 |
| 10 | * of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 20 | */ |
| 21 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 22 | #include <bts.h> |
| 23 | |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 24 | #include <stdio.h> |
| 25 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 26 | extern "C" { |
| 27 | #include <osmocom/core/msgb.h> |
| 28 | } |
| 29 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 30 | #include "pcu_utils.h" |
| 31 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 32 | /* reset LLC frame */ |
| 33 | void gprs_llc::reset() |
| 34 | { |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 35 | m_index = 0; |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 36 | m_length = 0; |
Holger Hans Peter Freyther | a42b2ad | 2013-11-26 16:39:47 +0100 | [diff] [blame] | 37 | |
| 38 | memset(frame, 0x42, sizeof(frame)); |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 39 | } |
| 40 | |
| 41 | void gprs_llc::reset_frame_space() |
| 42 | { |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 43 | m_index = 0; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 44 | } |
| 45 | |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 46 | /* Put an Unconfirmed Information (UI) Dummy command, see GSM 44.064, 6.4.2.2 */ |
| 47 | void gprs_llc::put_dummy_frame(size_t req_len) |
| 48 | { |
| 49 | /* The shortest dummy command (the spec requests at least 6 octets) */ |
| 50 | static const uint8_t llc_dummy_command[] = { |
| 51 | 0x43, 0xc0, 0x01, 0x2b, 0x2b, 0x2b |
| 52 | }; |
Jacob Erlbeck | 3db617f | 2015-07-07 13:43:44 +0200 | [diff] [blame] | 53 | static const size_t max_dummy_command_len = 79; |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 54 | |
| 55 | put_frame(llc_dummy_command, sizeof(llc_dummy_command)); |
| 56 | |
| 57 | if (req_len > max_dummy_command_len) |
| 58 | req_len = max_dummy_command_len; |
| 59 | |
| 60 | /* Add further stuffing, if the requested length exceeds the minimum |
| 61 | * dummy command length */ |
Pau Espin Pedrol | a70bf72 | 2021-03-02 12:28:32 +0100 | [diff] [blame] | 62 | if (m_length < req_len) { |
| 63 | memset(&frame[m_length], 0x2b, req_len - m_length); |
| 64 | m_length = req_len; |
| 65 | } |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 66 | } |
| 67 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 68 | void gprs_llc::put_frame(const uint8_t *data, size_t len) |
| 69 | { |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 70 | /* only put frames when we are empty */ |
Holger Hans Peter Freyther | 32f9a59 | 2013-11-13 17:14:42 +0100 | [diff] [blame] | 71 | OSMO_ASSERT(m_index == 0 && m_length == 0); |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 72 | append_frame(data, len); |
| 73 | } |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 74 | |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 75 | void gprs_llc::append_frame(const uint8_t *data, size_t len) |
| 76 | { |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 77 | /* TODO: bounds check */ |
Holger Hans Peter Freyther | 6058220 | 2013-11-21 21:30:23 +0100 | [diff] [blame] | 78 | memcpy(frame + m_length, data, len); |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 79 | m_length += len; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 80 | } |
| 81 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 82 | void gprs_llc::init() |
| 83 | { |
| 84 | reset(); |
| 85 | } |
| 86 | |
| 87 | bool gprs_llc::is_user_data_frame(uint8_t *data, size_t len) |
| 88 | { |
| 89 | if (len < 2) |
| 90 | return false; |
| 91 | |
| 92 | if ((data[0] & 0x0f) == 1 /* GPRS_SAPI_GMM */) |
| 93 | return false; |
| 94 | |
Jacob Erlbeck | d0aee85 | 2015-06-11 11:47:06 +0200 | [diff] [blame] | 95 | if ((data[0] & 0xe0) != 0xc0 /* LLC UI */) |
| 96 | /* It is not an LLC UI frame, see TS 44.064, 6.3 */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 97 | return false; |
| 98 | |
| 99 | return true; |
| 100 | } |
| 101 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 102 | void llc_queue_init(struct gprs_llc_queue *q) |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 103 | { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 104 | INIT_LLIST_HEAD(&q->m_queue); |
| 105 | q->m_queue_size = 0; |
| 106 | q->m_queue_octets = 0; |
| 107 | q->m_avg_queue_delay = 0; |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 108 | } |
| 109 | |
Pau Espin Pedrol | 5fc6e01 | 2020-02-26 20:05:33 +0100 | [diff] [blame] | 110 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 111 | void gprs_llc_queue::enqueue(struct msgb *llc_msg, const struct timespec *expire_time) |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 112 | { |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 113 | MetaInfo *meta_storage; |
| 114 | |
Pau Espin Pedrol | 5fc6e01 | 2020-02-26 20:05:33 +0100 | [diff] [blame] | 115 | osmo_static_assert(sizeof(*meta_storage) <= sizeof(llc_msg->cb), info_does_not_fit); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 116 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 117 | m_queue_size += 1; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 118 | m_queue_octets += msgb_length(llc_msg); |
| 119 | |
| 120 | meta_storage = (MetaInfo *)&llc_msg->cb[0]; |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 121 | osmo_clock_gettime(CLOCK_MONOTONIC, &meta_storage->recv_time); |
Pau Espin Pedrol | 5fc6e01 | 2020-02-26 20:05:33 +0100 | [diff] [blame] | 122 | meta_storage->expire_time = *expire_time; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 123 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 124 | msgb_enqueue(&m_queue, llc_msg); |
| 125 | } |
| 126 | |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 127 | void llc_queue_clear(struct gprs_llc_queue *q, struct gprs_rlcmac_bts *bts) |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 128 | { |
| 129 | struct msgb *msg; |
| 130 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 131 | while ((msg = msgb_dequeue(&q->m_queue))) { |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 132 | if (bts) |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 133 | bts_do_rate_ctr_inc(bts, CTR_LLC_FRAME_DROPPED); |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 134 | msgb_free(msg); |
| 135 | } |
Holger Hans Peter Freyther | 550bb88 | 2013-12-04 17:10:54 +0100 | [diff] [blame] | 136 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 137 | q->m_queue_size = 0; |
| 138 | q->m_queue_octets = 0; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 139 | } |
| 140 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 141 | void llc_queue_move_and_merge(struct gprs_llc_queue *q, struct gprs_llc_queue *o) |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 142 | { |
| 143 | struct msgb *msg, *msg1 = NULL, *msg2 = NULL; |
| 144 | struct llist_head new_queue; |
| 145 | size_t queue_size = 0; |
| 146 | size_t queue_octets = 0; |
| 147 | INIT_LLIST_HEAD(&new_queue); |
| 148 | |
| 149 | while (1) { |
| 150 | if (msg1 == NULL) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 151 | msg1 = msgb_dequeue(&q->m_queue); |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 152 | |
| 153 | if (msg2 == NULL) |
| 154 | msg2 = msgb_dequeue(&o->m_queue); |
| 155 | |
| 156 | if (msg1 == NULL && msg2 == NULL) |
| 157 | break; |
| 158 | |
| 159 | if (msg1 == NULL) { |
| 160 | msg = msg2; |
| 161 | msg2 = NULL; |
| 162 | } else if (msg2 == NULL) { |
| 163 | msg = msg1; |
| 164 | msg1 = NULL; |
| 165 | } else { |
| 166 | const MetaInfo *mi1 = (MetaInfo *)&msg1->cb[0]; |
| 167 | const MetaInfo *mi2 = (MetaInfo *)&msg2->cb[0]; |
| 168 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 169 | if (timespeccmp(&mi2->recv_time, &mi1->recv_time, >)) { |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 170 | msg = msg1; |
| 171 | msg1 = NULL; |
| 172 | } else { |
| 173 | msg = msg2; |
| 174 | msg2 = NULL; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | msgb_enqueue(&new_queue, msg); |
| 179 | queue_size += 1; |
| 180 | queue_octets += msgb_length(msg); |
| 181 | } |
| 182 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 183 | OSMO_ASSERT(llist_empty(&q->m_queue)); |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 184 | OSMO_ASSERT(llist_empty(&o->m_queue)); |
| 185 | |
| 186 | o->m_queue_size = 0; |
| 187 | o->m_queue_octets = 0; |
| 188 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 189 | llist_splice_init(&new_queue, &q->m_queue); |
| 190 | q->m_queue_size = queue_size; |
| 191 | q->m_queue_octets = queue_octets; |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 192 | } |
| 193 | |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 194 | #define ALPHA 0.5f |
| 195 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 196 | struct msgb *gprs_llc_queue::dequeue(const MetaInfo **info) |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 197 | { |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 198 | struct msgb *msg; |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 199 | struct timespec *tv, tv_now, tv_result; |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 200 | uint32_t lifetime; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 201 | const MetaInfo *meta_storage; |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 202 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 203 | msg = msgb_dequeue(&m_queue); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 204 | if (!msg) |
| 205 | return NULL; |
| 206 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 207 | meta_storage = (MetaInfo *)&msg->cb[0]; |
| 208 | |
| 209 | if (info) |
| 210 | *info = meta_storage; |
| 211 | |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 212 | m_queue_size -= 1; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 213 | m_queue_octets -= msgb_length(msg); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 214 | |
| 215 | /* take the second time */ |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 216 | osmo_clock_gettime(CLOCK_MONOTONIC, &tv_now); |
| 217 | tv = (struct timespec *)&msg->data[sizeof(*tv)]; |
| 218 | timespecsub(&tv_now, &meta_storage->recv_time, &tv_result); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 219 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 220 | lifetime = tv_result.tv_sec*1000 + tv_result.tv_nsec/1000000; |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 221 | m_avg_queue_delay = m_avg_queue_delay * ALPHA + lifetime * (1-ALPHA); |
| 222 | |
| 223 | return msg; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 224 | } |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 225 | |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 226 | void gprs_llc_queue::calc_pdu_lifetime(struct gprs_rlcmac_bts *bts, const uint16_t pdu_delay_csec, struct timespec *tv) |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 227 | { |
| 228 | uint16_t delay_csec; |
Pau Espin Pedrol | f473ec9 | 2021-01-14 14:45:14 +0100 | [diff] [blame] | 229 | if (bts->pcu->vty.force_llc_lifetime) |
| 230 | delay_csec = bts->pcu->vty.force_llc_lifetime; |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 231 | else |
| 232 | delay_csec = pdu_delay_csec; |
| 233 | |
Holger Hans Peter Freyther | 5a7f636 | 2013-11-21 21:59:32 +0100 | [diff] [blame] | 234 | /* keep timestamp at 0 for infinite delay */ |
Holger Hans Peter Freyther | 985fd11 | 2013-11-13 15:19:39 +0100 | [diff] [blame] | 235 | if (delay_csec == 0xffff) { |
| 236 | memset(tv, 0, sizeof(*tv)); |
| 237 | return; |
| 238 | } |
| 239 | |
| 240 | /* calculate timestamp of timeout */ |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 241 | struct timespec now, csec; |
| 242 | osmo_clock_gettime(CLOCK_MONOTONIC, &now); |
| 243 | csecs_to_timespec(delay_csec, &csec); |
Holger Hans Peter Freyther | 51e093b | 2013-11-13 15:35:45 +0100 | [diff] [blame] | 244 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 245 | timespecadd(&now, &csec, tv); |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 246 | } |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 247 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 248 | bool gprs_llc_queue::is_frame_expired(const struct timespec *tv_now, |
| 249 | const struct timespec *tv) |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 250 | { |
| 251 | /* Timeout is infinite */ |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 252 | if (tv->tv_sec == 0 && tv->tv_nsec == 0) |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 253 | return false; |
| 254 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 255 | return timespeccmp(tv_now, tv, >); |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 256 | } |