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. |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 16 | */ |
| 17 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 18 | #include <bts.h> |
| 19 | |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 20 | #include <stdio.h> |
| 21 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 22 | extern "C" { |
| 23 | #include <osmocom/core/msgb.h> |
| 24 | } |
| 25 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 26 | #include "pcu_utils.h" |
| 27 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 28 | /* reset LLC frame */ |
| 29 | void gprs_llc::reset() |
| 30 | { |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 31 | index = 0; |
| 32 | length = 0; |
Holger Hans Peter Freyther | a42b2ad | 2013-11-26 16:39:47 +0100 | [diff] [blame] | 33 | |
| 34 | memset(frame, 0x42, sizeof(frame)); |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 35 | } |
| 36 | |
| 37 | void gprs_llc::reset_frame_space() |
| 38 | { |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 39 | index = 0; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 40 | } |
| 41 | |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 42 | /* Put an Unconfirmed Information (UI) Dummy command, see GSM 44.064, 6.4.2.2 */ |
| 43 | void gprs_llc::put_dummy_frame(size_t req_len) |
| 44 | { |
| 45 | /* The shortest dummy command (the spec requests at least 6 octets) */ |
| 46 | static const uint8_t llc_dummy_command[] = { |
| 47 | 0x43, 0xc0, 0x01, 0x2b, 0x2b, 0x2b |
| 48 | }; |
Jacob Erlbeck | 3db617f | 2015-07-07 13:43:44 +0200 | [diff] [blame] | 49 | static const size_t max_dummy_command_len = 79; |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 50 | |
| 51 | put_frame(llc_dummy_command, sizeof(llc_dummy_command)); |
| 52 | |
| 53 | if (req_len > max_dummy_command_len) |
| 54 | req_len = max_dummy_command_len; |
| 55 | |
| 56 | /* Add further stuffing, if the requested length exceeds the minimum |
| 57 | * dummy command length */ |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 58 | if (length < req_len) { |
| 59 | memset(&frame[length], 0x2b, req_len - length); |
| 60 | length = req_len; |
Pau Espin Pedrol | a70bf72 | 2021-03-02 12:28:32 +0100 | [diff] [blame] | 61 | } |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 62 | } |
| 63 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 64 | void gprs_llc::put_frame(const uint8_t *data, size_t len) |
| 65 | { |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 66 | /* only put frames when we are empty */ |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 67 | OSMO_ASSERT(index == 0 && length == 0); |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 68 | append_frame(data, len); |
| 69 | } |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 70 | |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 71 | void gprs_llc::append_frame(const uint8_t *data, size_t len) |
| 72 | { |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 73 | /* TODO: bounds check */ |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 74 | memcpy(frame + length, data, len); |
| 75 | length += len; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 76 | } |
| 77 | |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 78 | void gprs_llc::init() |
| 79 | { |
| 80 | reset(); |
| 81 | } |
| 82 | |
| 83 | bool gprs_llc::is_user_data_frame(uint8_t *data, size_t len) |
| 84 | { |
| 85 | if (len < 2) |
| 86 | return false; |
| 87 | |
| 88 | if ((data[0] & 0x0f) == 1 /* GPRS_SAPI_GMM */) |
| 89 | return false; |
| 90 | |
Jacob Erlbeck | d0aee85 | 2015-06-11 11:47:06 +0200 | [diff] [blame] | 91 | if ((data[0] & 0xe0) != 0xc0 /* LLC UI */) |
| 92 | /* 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] | 93 | return false; |
| 94 | |
| 95 | return true; |
| 96 | } |
| 97 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 98 | void llc_queue_init(struct gprs_llc_queue *q) |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 99 | { |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 100 | INIT_LLIST_HEAD(&q->queue); |
| 101 | q->queue_size = 0; |
| 102 | q->queue_octets = 0; |
| 103 | q->avg_queue_delay = 0; |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 104 | } |
| 105 | |
Pau Espin Pedrol | 5fc6e01 | 2020-02-26 20:05:33 +0100 | [diff] [blame] | 106 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 107 | 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] | 108 | { |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 109 | MetaInfo *meta_storage; |
| 110 | |
Pau Espin Pedrol | 5fc6e01 | 2020-02-26 20:05:33 +0100 | [diff] [blame] | 111 | 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] | 112 | |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 113 | queue_size += 1; |
| 114 | queue_octets += msgb_length(llc_msg); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 115 | |
| 116 | meta_storage = (MetaInfo *)&llc_msg->cb[0]; |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 117 | osmo_clock_gettime(CLOCK_MONOTONIC, &meta_storage->recv_time); |
Pau Espin Pedrol | 5fc6e01 | 2020-02-26 20:05:33 +0100 | [diff] [blame] | 118 | meta_storage->expire_time = *expire_time; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 119 | |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 120 | msgb_enqueue(&queue, llc_msg); |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 121 | } |
| 122 | |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 123 | 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] | 124 | { |
| 125 | struct msgb *msg; |
| 126 | |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 127 | while ((msg = msgb_dequeue(&q->queue))) { |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 128 | if (bts) |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 129 | bts_do_rate_ctr_inc(bts, CTR_LLC_FRAME_DROPPED); |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 130 | msgb_free(msg); |
| 131 | } |
Holger Hans Peter Freyther | 550bb88 | 2013-12-04 17:10:54 +0100 | [diff] [blame] | 132 | |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 133 | q->queue_size = 0; |
| 134 | q->queue_octets = 0; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 135 | } |
| 136 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 137 | 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] | 138 | { |
| 139 | struct msgb *msg, *msg1 = NULL, *msg2 = NULL; |
| 140 | struct llist_head new_queue; |
| 141 | size_t queue_size = 0; |
| 142 | size_t queue_octets = 0; |
| 143 | INIT_LLIST_HEAD(&new_queue); |
| 144 | |
| 145 | while (1) { |
| 146 | if (msg1 == NULL) |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 147 | msg1 = msgb_dequeue(&q->queue); |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 148 | |
| 149 | if (msg2 == NULL) |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 150 | msg2 = msgb_dequeue(&o->queue); |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 151 | |
| 152 | if (msg1 == NULL && msg2 == NULL) |
| 153 | break; |
| 154 | |
| 155 | if (msg1 == NULL) { |
| 156 | msg = msg2; |
| 157 | msg2 = NULL; |
| 158 | } else if (msg2 == NULL) { |
| 159 | msg = msg1; |
| 160 | msg1 = NULL; |
| 161 | } else { |
| 162 | const MetaInfo *mi1 = (MetaInfo *)&msg1->cb[0]; |
| 163 | const MetaInfo *mi2 = (MetaInfo *)&msg2->cb[0]; |
| 164 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 165 | if (timespeccmp(&mi2->recv_time, &mi1->recv_time, >)) { |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 166 | msg = msg1; |
| 167 | msg1 = NULL; |
| 168 | } else { |
| 169 | msg = msg2; |
| 170 | msg2 = NULL; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | msgb_enqueue(&new_queue, msg); |
| 175 | queue_size += 1; |
| 176 | queue_octets += msgb_length(msg); |
| 177 | } |
| 178 | |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 179 | OSMO_ASSERT(llist_empty(&q->queue)); |
| 180 | OSMO_ASSERT(llist_empty(&o->queue)); |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 181 | |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 182 | o->queue_size = 0; |
| 183 | o->queue_octets = 0; |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 184 | |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 185 | llist_splice_init(&new_queue, &q->queue); |
| 186 | q->queue_size = queue_size; |
| 187 | q->queue_octets = queue_octets; |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 188 | } |
| 189 | |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 190 | #define ALPHA 0.5f |
| 191 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 192 | struct msgb *gprs_llc_queue::dequeue(const MetaInfo **info) |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 193 | { |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 194 | struct msgb *msg; |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 195 | struct timespec *tv, tv_now, tv_result; |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 196 | uint32_t lifetime; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 197 | const MetaInfo *meta_storage; |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 198 | |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 199 | msg = msgb_dequeue(&queue); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 200 | if (!msg) |
| 201 | return NULL; |
| 202 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 203 | meta_storage = (MetaInfo *)&msg->cb[0]; |
| 204 | |
| 205 | if (info) |
| 206 | *info = meta_storage; |
| 207 | |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 208 | queue_size -= 1; |
| 209 | queue_octets -= msgb_length(msg); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 210 | |
| 211 | /* take the second time */ |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 212 | osmo_clock_gettime(CLOCK_MONOTONIC, &tv_now); |
| 213 | tv = (struct timespec *)&msg->data[sizeof(*tv)]; |
| 214 | timespecsub(&tv_now, &meta_storage->recv_time, &tv_result); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 215 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 216 | lifetime = tv_result.tv_sec*1000 + tv_result.tv_nsec/1000000; |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame^] | 217 | avg_queue_delay = avg_queue_delay * ALPHA + lifetime * (1-ALPHA); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 218 | |
| 219 | return msg; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 220 | } |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 221 | |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 222 | 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] | 223 | { |
| 224 | uint16_t delay_csec; |
Pau Espin Pedrol | f473ec9 | 2021-01-14 14:45:14 +0100 | [diff] [blame] | 225 | if (bts->pcu->vty.force_llc_lifetime) |
| 226 | delay_csec = bts->pcu->vty.force_llc_lifetime; |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 227 | else |
| 228 | delay_csec = pdu_delay_csec; |
| 229 | |
Holger Hans Peter Freyther | 5a7f636 | 2013-11-21 21:59:32 +0100 | [diff] [blame] | 230 | /* keep timestamp at 0 for infinite delay */ |
Holger Hans Peter Freyther | 985fd11 | 2013-11-13 15:19:39 +0100 | [diff] [blame] | 231 | if (delay_csec == 0xffff) { |
| 232 | memset(tv, 0, sizeof(*tv)); |
| 233 | return; |
| 234 | } |
| 235 | |
| 236 | /* calculate timestamp of timeout */ |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 237 | struct timespec now, csec; |
| 238 | osmo_clock_gettime(CLOCK_MONOTONIC, &now); |
| 239 | csecs_to_timespec(delay_csec, &csec); |
Holger Hans Peter Freyther | 51e093b | 2013-11-13 15:35:45 +0100 | [diff] [blame] | 240 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 241 | timespecadd(&now, &csec, tv); |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 242 | } |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 243 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 244 | bool gprs_llc_queue::is_frame_expired(const struct timespec *tv_now, |
| 245 | const struct timespec *tv) |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 246 | { |
| 247 | /* Timeout is infinite */ |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 248 | if (tv->tv_sec == 0 && tv->tv_nsec == 0) |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 249 | return false; |
| 250 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 251 | return timespeccmp(tv_now, tv, >); |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 252 | } |