Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 1 | /* gprs_ms.cpp |
| 2 | * |
| 3 | * Copyright (C) 2015 by Sysmocom s.f.m.c. GmbH |
| 4 | * Author: Jacob Erlbeck <jerlbeck@sysmocom.de> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version 2 |
| 9 | * of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | */ |
| 20 | |
| 21 | |
| 22 | #include "gprs_ms.h" |
| 23 | |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 24 | #include "bts.h" |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 25 | #include "tbf.h" |
| 26 | #include "gprs_debug.h" |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 27 | #include "gprs_codel.h" |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 28 | |
Jacob Erlbeck | 8158ea7 | 2015-06-04 17:46:33 +0200 | [diff] [blame] | 29 | #include <time.h> |
| 30 | |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 31 | extern "C" { |
| 32 | #include <osmocom/core/talloc.h> |
| 33 | #include <osmocom/core/utils.h> |
| 34 | } |
| 35 | |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 36 | #define GPRS_CODEL_SLOW_INTERVAL_MS 2000 |
| 37 | |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 38 | extern void *tall_pcu_ctx; |
| 39 | |
Jacob Erlbeck | 8158ea7 | 2015-06-04 17:46:33 +0200 | [diff] [blame] | 40 | static int64_t now_msec() |
| 41 | { |
| 42 | struct timespec ts; |
| 43 | clock_gettime(CLOCK_MONOTONIC, &ts); |
| 44 | |
| 45 | return int64_t(ts.tv_sec) * 1000 + ts.tv_nsec / 1000000; |
| 46 | } |
| 47 | |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 48 | struct GprsMsDefaultCallback: public GprsMs::Callback { |
| 49 | virtual void ms_idle(class GprsMs *ms) { |
| 50 | delete ms; |
| 51 | } |
| 52 | virtual void ms_active(class GprsMs *) {} |
| 53 | }; |
| 54 | |
| 55 | static GprsMsDefaultCallback gprs_default_cb; |
| 56 | |
Jacob Erlbeck | d9e1024 | 2015-05-28 15:43:53 +0200 | [diff] [blame] | 57 | GprsMs::Guard::Guard(GprsMs *ms) : |
| 58 | m_ms(ms ? ms->ref() : NULL) |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 59 | { |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | GprsMs::Guard::~Guard() |
| 63 | { |
| 64 | if (m_ms) |
| 65 | m_ms->unref(); |
| 66 | } |
| 67 | |
Jacob Erlbeck | b2439bb | 2015-07-13 14:23:32 +0200 | [diff] [blame] | 68 | bool GprsMs::Guard::is_idle() const |
| 69 | { |
| 70 | if (!m_ms) |
| 71 | return true; |
| 72 | |
| 73 | return !m_ms->m_ul_tbf && !m_ms->m_dl_tbf && m_ms->m_ref == 1; |
| 74 | } |
| 75 | |
Jacob Erlbeck | d9e1024 | 2015-05-28 15:43:53 +0200 | [diff] [blame] | 76 | void GprsMs::timeout(void *priv_) |
| 77 | { |
| 78 | GprsMs *ms = static_cast<GprsMs *>(priv_); |
| 79 | |
| 80 | LOGP(DRLCMAC, LOGL_INFO, "Timeout for MS object, TLLI = 0x%08x\n", |
| 81 | ms->tlli()); |
| 82 | |
| 83 | if (ms->m_timer.data) { |
| 84 | ms->m_timer.data = NULL; |
| 85 | ms->unref(); |
| 86 | } |
| 87 | } |
| 88 | |
Jacob Erlbeck | 17214bb | 2015-06-02 14:06:12 +0200 | [diff] [blame] | 89 | GprsMs::GprsMs(BTS *bts, uint32_t tlli) : |
| 90 | m_bts(bts), |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 91 | m_cb(&gprs_default_cb), |
| 92 | m_ul_tbf(NULL), |
| 93 | m_dl_tbf(NULL), |
| 94 | m_tlli(tlli), |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 95 | m_new_ul_tlli(0), |
| 96 | m_new_dl_tlli(0), |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 97 | m_ta(0), |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 98 | m_ms_class(0), |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 99 | m_current_cs_ul(1), |
| 100 | m_current_cs_dl(1), |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 101 | m_is_idle(true), |
Jacob Erlbeck | 5367086 | 2015-05-12 17:54:33 +0200 | [diff] [blame] | 102 | m_ref(0), |
Jacob Erlbeck | 25db7c6 | 2015-06-11 12:59:01 +0200 | [diff] [blame] | 103 | m_list(this), |
Jacob Erlbeck | 04a1086 | 2015-06-12 16:01:56 +0200 | [diff] [blame] | 104 | m_delay(0), |
Jacob Erlbeck | 23f93a1 | 2015-06-30 08:52:54 +0200 | [diff] [blame] | 105 | m_nack_rate_dl(0), |
| 106 | m_reserved_dl_slots(0), |
| 107 | m_reserved_ul_slots(0), |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 108 | m_current_trx(NULL), |
| 109 | m_codel_state(NULL) |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 110 | { |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 111 | int codel_interval = LLC_CODEL_USE_DEFAULT; |
| 112 | |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 113 | LOGP(DRLCMAC, LOGL_INFO, "Creating MS object, TLLI = 0x%08x\n", tlli); |
Jacob Erlbeck | b0e5eaf | 2015-05-21 11:07:16 +0200 | [diff] [blame] | 114 | |
| 115 | m_imsi[0] = 0; |
Jacob Erlbeck | d9e1024 | 2015-05-28 15:43:53 +0200 | [diff] [blame] | 116 | memset(&m_timer, 0, sizeof(m_timer)); |
| 117 | m_timer.cb = GprsMs::timeout; |
Jacob Erlbeck | 489a2b3 | 2015-05-28 19:07:01 +0200 | [diff] [blame] | 118 | m_llc_queue.init(); |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 119 | if (m_bts) { |
| 120 | m_current_cs_ul = m_bts->bts_data()->initial_cs_ul; |
| 121 | if (m_current_cs_ul < 1) |
| 122 | m_current_cs_ul = 1; |
| 123 | |
| 124 | m_current_cs_dl = m_bts->bts_data()->initial_cs_dl; |
| 125 | if (m_current_cs_dl < 1) |
| 126 | m_current_cs_dl = 1; |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 127 | |
| 128 | codel_interval = m_bts->bts_data()->llc_codel_interval_msec; |
| 129 | } |
| 130 | |
| 131 | if (codel_interval) { |
| 132 | if (codel_interval == LLC_CODEL_USE_DEFAULT) |
| 133 | codel_interval = GPRS_CODEL_SLOW_INTERVAL_MS; |
| 134 | m_codel_state = talloc(this, struct gprs_codel); |
| 135 | gprs_codel_init(m_codel_state); |
| 136 | gprs_codel_set_interval(m_codel_state, codel_interval); |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 137 | } |
Jacob Erlbeck | 8158ea7 | 2015-06-04 17:46:33 +0200 | [diff] [blame] | 138 | m_last_cs_not_low = now_msec(); |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 139 | } |
| 140 | |
| 141 | GprsMs::~GprsMs() |
| 142 | { |
| 143 | LOGP(DRLCMAC, LOGL_INFO, "Destroying MS object, TLLI = 0x%08x\n", tlli()); |
Jacob Erlbeck | fecece0 | 2015-05-08 12:13:08 +0200 | [diff] [blame] | 144 | |
Jacob Erlbeck | 23f93a1 | 2015-06-30 08:52:54 +0200 | [diff] [blame] | 145 | set_reserved_slots(NULL, 0, 0); |
| 146 | |
Jacob Erlbeck | d9e1024 | 2015-05-28 15:43:53 +0200 | [diff] [blame] | 147 | if (osmo_timer_pending(&m_timer)) |
| 148 | osmo_timer_del(&m_timer); |
| 149 | |
Jacob Erlbeck | fecece0 | 2015-05-08 12:13:08 +0200 | [diff] [blame] | 150 | if (m_ul_tbf) { |
| 151 | m_ul_tbf->set_ms(NULL); |
| 152 | m_ul_tbf = NULL; |
| 153 | } |
| 154 | |
| 155 | if (m_dl_tbf) { |
| 156 | m_dl_tbf->set_ms(NULL); |
| 157 | m_dl_tbf = NULL; |
| 158 | } |
Jacob Erlbeck | 17214bb | 2015-06-02 14:06:12 +0200 | [diff] [blame] | 159 | m_llc_queue.clear(m_bts); |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 160 | } |
| 161 | |
| 162 | void* GprsMs::operator new(size_t size) |
| 163 | { |
| 164 | static void *tall_ms_ctx = NULL; |
| 165 | if (!tall_ms_ctx) |
| 166 | tall_ms_ctx = talloc_named_const(tall_pcu_ctx, 0, __PRETTY_FUNCTION__); |
| 167 | |
| 168 | return talloc_size(tall_ms_ctx, size); |
| 169 | } |
| 170 | |
| 171 | void GprsMs::operator delete(void* p) |
| 172 | { |
| 173 | talloc_free(p); |
| 174 | } |
| 175 | |
Jacob Erlbeck | d9e1024 | 2015-05-28 15:43:53 +0200 | [diff] [blame] | 176 | GprsMs *GprsMs::ref() |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 177 | { |
| 178 | m_ref += 1; |
Jacob Erlbeck | d9e1024 | 2015-05-28 15:43:53 +0200 | [diff] [blame] | 179 | return this; |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 180 | } |
| 181 | |
| 182 | void GprsMs::unref() |
| 183 | { |
| 184 | OSMO_ASSERT(m_ref >= 0); |
| 185 | m_ref -= 1; |
| 186 | if (m_ref == 0) |
| 187 | update_status(); |
| 188 | } |
| 189 | |
Jacob Erlbeck | d9e1024 | 2015-05-28 15:43:53 +0200 | [diff] [blame] | 190 | void GprsMs::start_timer() |
| 191 | { |
| 192 | if (m_delay == 0) |
| 193 | return; |
| 194 | |
| 195 | if (!m_timer.data) |
| 196 | m_timer.data = ref(); |
| 197 | |
| 198 | osmo_timer_schedule(&m_timer, m_delay, 0); |
| 199 | } |
| 200 | |
| 201 | void GprsMs::stop_timer() |
| 202 | { |
| 203 | if (!m_timer.data) |
| 204 | return; |
| 205 | |
| 206 | osmo_timer_del(&m_timer); |
| 207 | m_timer.data = NULL; |
| 208 | unref(); |
| 209 | } |
| 210 | |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 211 | void GprsMs::attach_tbf(struct gprs_rlcmac_tbf *tbf) |
| 212 | { |
| 213 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 214 | attach_dl_tbf(static_cast<gprs_rlcmac_dl_tbf *>(tbf)); |
| 215 | else |
| 216 | attach_ul_tbf(static_cast<gprs_rlcmac_ul_tbf *>(tbf)); |
| 217 | } |
| 218 | |
| 219 | void GprsMs::attach_ul_tbf(struct gprs_rlcmac_ul_tbf *tbf) |
| 220 | { |
| 221 | if (m_ul_tbf == tbf) |
| 222 | return; |
| 223 | |
| 224 | LOGP(DRLCMAC, LOGL_INFO, "Attaching TBF to MS object, TLLI = 0x%08x, TBF = %s\n", |
| 225 | tlli(), tbf->name()); |
| 226 | |
| 227 | Guard guard(this); |
| 228 | |
| 229 | if (m_ul_tbf) |
| 230 | detach_tbf(m_ul_tbf); |
| 231 | |
| 232 | m_ul_tbf = tbf; |
Jacob Erlbeck | d9e1024 | 2015-05-28 15:43:53 +0200 | [diff] [blame] | 233 | |
| 234 | if (tbf) |
| 235 | stop_timer(); |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | void GprsMs::attach_dl_tbf(struct gprs_rlcmac_dl_tbf *tbf) |
| 239 | { |
| 240 | if (m_dl_tbf == tbf) |
| 241 | return; |
| 242 | |
| 243 | LOGP(DRLCMAC, LOGL_INFO, "Attaching TBF to MS object, TLLI = 0x%08x, TBF = %s\n", |
| 244 | tlli(), tbf->name()); |
| 245 | |
| 246 | Guard guard(this); |
| 247 | |
| 248 | if (m_dl_tbf) |
| 249 | detach_tbf(m_dl_tbf); |
| 250 | |
| 251 | m_dl_tbf = tbf; |
Jacob Erlbeck | d9e1024 | 2015-05-28 15:43:53 +0200 | [diff] [blame] | 252 | |
| 253 | if (tbf) |
| 254 | stop_timer(); |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 255 | } |
| 256 | |
| 257 | void GprsMs::detach_tbf(gprs_rlcmac_tbf *tbf) |
| 258 | { |
| 259 | if (m_ul_tbf && tbf == static_cast<gprs_rlcmac_tbf *>(m_ul_tbf)) |
| 260 | m_ul_tbf = NULL; |
| 261 | else if (m_dl_tbf && tbf == static_cast<gprs_rlcmac_tbf *>(m_dl_tbf)) |
| 262 | m_dl_tbf = NULL; |
| 263 | else |
| 264 | return; |
| 265 | |
| 266 | LOGP(DRLCMAC, LOGL_INFO, "Detaching TBF from MS object, TLLI = 0x%08x, TBF = %s\n", |
| 267 | tlli(), tbf->name()); |
| 268 | |
Jacob Erlbeck | fecece0 | 2015-05-08 12:13:08 +0200 | [diff] [blame] | 269 | if (tbf->ms() == this) |
| 270 | tbf->set_ms(NULL); |
| 271 | |
Jacob Erlbeck | 23f93a1 | 2015-06-30 08:52:54 +0200 | [diff] [blame] | 272 | if (!m_dl_tbf && !m_ul_tbf) { |
| 273 | set_reserved_slots(NULL, 0, 0); |
| 274 | |
| 275 | if (tlli() != 0) |
| 276 | start_timer(); |
| 277 | } |
Jacob Erlbeck | d9e1024 | 2015-05-28 15:43:53 +0200 | [diff] [blame] | 278 | |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 279 | update_status(); |
| 280 | } |
| 281 | |
| 282 | void GprsMs::update_status() |
| 283 | { |
| 284 | if (m_ref > 0) |
| 285 | return; |
| 286 | |
| 287 | if (is_idle() && !m_is_idle) { |
| 288 | m_is_idle = true; |
| 289 | m_cb->ms_idle(this); |
| 290 | /* this can be deleted by now, do not access it */ |
| 291 | return; |
| 292 | } |
| 293 | |
| 294 | if (!is_idle() && m_is_idle) { |
| 295 | m_is_idle = false; |
| 296 | m_cb->ms_active(this); |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | void GprsMs::set_tlli(uint32_t tlli) |
| 301 | { |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 302 | if (tlli == m_tlli || tlli == m_new_ul_tlli) |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 303 | return; |
| 304 | |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 305 | if (tlli != m_new_dl_tlli) { |
| 306 | LOGP(DRLCMAC, LOGL_INFO, |
| 307 | "Modifying MS object, UL TLLI: 0x%08x -> 0x%08x, " |
| 308 | "not yet confirmed\n", |
| 309 | this->tlli(), tlli); |
| 310 | m_new_ul_tlli = tlli; |
| 311 | return; |
| 312 | } |
| 313 | |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 314 | LOGP(DRLCMAC, LOGL_INFO, |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 315 | "Modifying MS object, TLLI: 0x%08x -> 0x%08x, " |
| 316 | "already confirmed partly\n", |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 317 | m_tlli, tlli); |
| 318 | |
| 319 | m_tlli = tlli; |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 320 | m_new_dl_tlli = 0; |
| 321 | m_new_ul_tlli = 0; |
| 322 | } |
| 323 | |
| 324 | bool GprsMs::confirm_tlli(uint32_t tlli) |
| 325 | { |
| 326 | if (tlli == m_tlli || tlli == m_new_dl_tlli) |
| 327 | return false; |
| 328 | |
| 329 | if (tlli != m_new_ul_tlli) { |
| 330 | /* The MS has not sent a message with the new TLLI, which may |
| 331 | * happen according to the spec [TODO: add reference]. */ |
| 332 | |
| 333 | LOGP(DRLCMAC, LOGL_INFO, |
| 334 | "The MS object cannot fully confirm an unexpected TLLI: 0x%08x, " |
| 335 | "partly confirmed\n", tlli); |
| 336 | /* Use the network's idea of TLLI as candidate, this does not |
| 337 | * change the result value of tlli() */ |
| 338 | m_new_dl_tlli = tlli; |
| 339 | return false; |
| 340 | } |
| 341 | |
| 342 | LOGP(DRLCMAC, LOGL_INFO, |
| 343 | "Modifying MS object, TLLI: 0x%08x confirmed\n", tlli); |
| 344 | |
| 345 | m_tlli = tlli; |
| 346 | m_new_dl_tlli = 0; |
| 347 | m_new_ul_tlli = 0; |
| 348 | |
| 349 | return true; |
Jacob Erlbeck | e04e0b0 | 2015-05-06 18:30:48 +0200 | [diff] [blame] | 350 | } |
Jacob Erlbeck | b0e5eaf | 2015-05-21 11:07:16 +0200 | [diff] [blame] | 351 | |
| 352 | void GprsMs::set_imsi(const char *imsi) |
| 353 | { |
| 354 | if (!imsi) { |
| 355 | LOGP(DRLCMAC, LOGL_ERROR, "Expected IMSI!\n"); |
| 356 | return; |
| 357 | } |
| 358 | |
| 359 | if (imsi[0] && strlen(imsi) < 3) { |
| 360 | LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI '%s'!\n", |
| 361 | imsi); |
| 362 | return; |
| 363 | } |
| 364 | |
| 365 | if (strcmp(imsi, m_imsi) == 0) |
| 366 | return; |
| 367 | |
| 368 | LOGP(DRLCMAC, LOGL_INFO, |
| 369 | "Modifying MS object, TLLI = 0x%08x, IMSI '%s' -> '%s'\n", |
| 370 | tlli(), m_imsi, imsi); |
| 371 | |
| 372 | strncpy(m_imsi, imsi, sizeof(m_imsi)); |
| 373 | m_imsi[sizeof(m_imsi) - 1] = '\0'; |
| 374 | } |
| 375 | |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 376 | void GprsMs::set_ta(uint8_t ta_) |
| 377 | { |
| 378 | if (ta_ == m_ta) |
| 379 | return; |
| 380 | |
| 381 | LOGP(DRLCMAC, LOGL_INFO, |
| 382 | "Modifying MS object, TLLI = 0x%08x, TA %d -> %d\n", |
| 383 | tlli(), m_ta, ta_); |
| 384 | |
| 385 | m_ta = ta_; |
| 386 | } |
| 387 | |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 388 | void GprsMs::set_ms_class(uint8_t ms_class_) |
| 389 | { |
| 390 | if (ms_class_ == m_ms_class) |
| 391 | return; |
| 392 | |
| 393 | LOGP(DRLCMAC, LOGL_INFO, |
| 394 | "Modifying MS object, TLLI = 0x%08x, MS class %d -> %d\n", |
| 395 | tlli(), m_ms_class, ms_class_); |
| 396 | |
| 397 | m_ms_class = ms_class_; |
| 398 | } |
| 399 | |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 400 | void GprsMs::update_error_rate(gprs_rlcmac_tbf *tbf, int error_rate) |
| 401 | { |
| 402 | struct gprs_rlcmac_bts *bts_data; |
Jacob Erlbeck | 8158ea7 | 2015-06-04 17:46:33 +0200 | [diff] [blame] | 403 | int64_t now; |
Jacob Erlbeck | 94cde13 | 2015-06-09 09:44:36 +0200 | [diff] [blame] | 404 | uint8_t max_cs_dl = 4; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 405 | |
| 406 | OSMO_ASSERT(m_bts != NULL); |
| 407 | bts_data = m_bts->bts_data(); |
| 408 | |
| 409 | if (error_rate < 0) |
| 410 | return; |
| 411 | |
Jacob Erlbeck | 8158ea7 | 2015-06-04 17:46:33 +0200 | [diff] [blame] | 412 | now = now_msec(); |
| 413 | |
Jacob Erlbeck | b33e675 | 2015-06-04 19:04:30 +0200 | [diff] [blame] | 414 | if (bts_data->max_cs_dl) |
| 415 | max_cs_dl = bts_data->max_cs_dl; |
| 416 | |
Jacob Erlbeck | 94cde13 | 2015-06-09 09:44:36 +0200 | [diff] [blame] | 417 | /* TODO: Check for TBF direction */ |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 418 | /* TODO: Support different CS values for UL and DL */ |
| 419 | |
Jacob Erlbeck | 04a1086 | 2015-06-12 16:01:56 +0200 | [diff] [blame] | 420 | m_nack_rate_dl = error_rate; |
| 421 | |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 422 | if (error_rate > bts_data->cs_adj_upper_limit) { |
| 423 | if (m_current_cs_dl > 1) { |
| 424 | m_current_cs_dl -= 1; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 425 | LOGP(DRLCMACDL, LOGL_INFO, |
| 426 | "MS (IMSI %s): High error rate %d%%, " |
| 427 | "reducing CS level to %d\n", |
| 428 | imsi(), error_rate, m_current_cs_dl); |
Jacob Erlbeck | 8158ea7 | 2015-06-04 17:46:33 +0200 | [diff] [blame] | 429 | m_last_cs_not_low = now; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 430 | } |
| 431 | } else if (error_rate < bts_data->cs_adj_lower_limit) { |
Jacob Erlbeck | b33e675 | 2015-06-04 19:04:30 +0200 | [diff] [blame] | 432 | if (m_current_cs_dl < max_cs_dl) { |
Jacob Erlbeck | 8158ea7 | 2015-06-04 17:46:33 +0200 | [diff] [blame] | 433 | if (now - m_last_cs_not_low > 1000) { |
| 434 | m_current_cs_dl += 1; |
Jacob Erlbeck | b33e675 | 2015-06-04 19:04:30 +0200 | [diff] [blame] | 435 | |
Jacob Erlbeck | 8158ea7 | 2015-06-04 17:46:33 +0200 | [diff] [blame] | 436 | LOGP(DRLCMACDL, LOGL_INFO, |
| 437 | "MS (IMSI %s): Low error rate %d%%, " |
Jacob Erlbeck | 94cde13 | 2015-06-09 09:44:36 +0200 | [diff] [blame] | 438 | "increasing DL CS level to %d\n", |
Jacob Erlbeck | 8158ea7 | 2015-06-04 17:46:33 +0200 | [diff] [blame] | 439 | imsi(), error_rate, m_current_cs_dl); |
| 440 | m_last_cs_not_low = now; |
| 441 | } else { |
| 442 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 443 | "MS (IMSI %s): Low error rate %d%%, " |
| 444 | "ignored (within blocking period)\n", |
| 445 | imsi(), error_rate); |
| 446 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 447 | } |
| 448 | } else { |
| 449 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 450 | "MS (IMSI %s): Medium error rate %d%%, ignored\n", |
| 451 | imsi(), error_rate); |
Jacob Erlbeck | 8158ea7 | 2015-06-04 17:46:33 +0200 | [diff] [blame] | 452 | m_last_cs_not_low = now; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 453 | } |
| 454 | } |
Jacob Erlbeck | e4bcb62 | 2015-06-08 11:26:38 +0200 | [diff] [blame] | 455 | |
| 456 | void GprsMs::update_l1_meas(const pcu_l1_meas *meas) |
| 457 | { |
Jacob Erlbeck | 94cde13 | 2015-06-09 09:44:36 +0200 | [diff] [blame] | 458 | struct gprs_rlcmac_bts *bts_data; |
| 459 | uint8_t max_cs_ul = 4; |
Jacob Erlbeck | 51b1151 | 2015-06-11 16:54:50 +0200 | [diff] [blame] | 460 | unsigned i; |
Jacob Erlbeck | 94cde13 | 2015-06-09 09:44:36 +0200 | [diff] [blame] | 461 | |
| 462 | OSMO_ASSERT(m_bts != NULL); |
| 463 | bts_data = m_bts->bts_data(); |
| 464 | |
| 465 | if (bts_data->max_cs_ul) |
| 466 | max_cs_ul = bts_data->max_cs_ul; |
| 467 | |
| 468 | if (meas->have_link_qual) { |
| 469 | int old_link_qual = meas->link_qual; |
| 470 | int low = bts_data->cs_lqual_ranges[current_cs_ul()-1].low; |
| 471 | int high = bts_data->cs_lqual_ranges[current_cs_ul()-1].high; |
| 472 | uint8_t new_cs_ul = m_current_cs_ul; |
| 473 | |
| 474 | if (m_l1_meas.have_link_qual) |
| 475 | old_link_qual = m_l1_meas.link_qual; |
| 476 | |
| 477 | if (meas->link_qual < low && old_link_qual < low) |
| 478 | new_cs_ul = m_current_cs_ul - 1; |
| 479 | else if (meas->link_qual > high && old_link_qual > high && |
| 480 | m_current_cs_ul < max_cs_ul) |
| 481 | new_cs_ul = m_current_cs_ul + 1; |
| 482 | |
| 483 | if (m_current_cs_ul != new_cs_ul) { |
| 484 | LOGP(DRLCMACDL, LOGL_INFO, |
| 485 | "MS (IMSI %s): " |
| 486 | "Link quality %ddB (%ddB) left window [%d, %d], " |
| 487 | "modifying uplink CS level: %d -> %d\n", |
| 488 | imsi(), meas->link_qual, old_link_qual, |
| 489 | low, high, |
| 490 | m_current_cs_ul, new_cs_ul); |
| 491 | |
| 492 | m_current_cs_ul = new_cs_ul; |
| 493 | } |
| 494 | } |
| 495 | |
Jacob Erlbeck | e4bcb62 | 2015-06-08 11:26:38 +0200 | [diff] [blame] | 496 | if (meas->have_rssi) |
| 497 | m_l1_meas.set_rssi(meas->rssi); |
| 498 | if (meas->have_bto) |
| 499 | m_l1_meas.set_bto(meas->bto); |
| 500 | if (meas->have_ber) |
| 501 | m_l1_meas.set_ber(meas->ber); |
| 502 | if (meas->have_link_qual) |
| 503 | m_l1_meas.set_link_qual(meas->link_qual); |
Jacob Erlbeck | 51b1151 | 2015-06-11 16:54:50 +0200 | [diff] [blame] | 504 | |
| 505 | if (meas->have_ms_rx_qual) |
| 506 | m_l1_meas.set_ms_rx_qual(meas->ms_rx_qual); |
| 507 | if (meas->have_ms_c_value) |
| 508 | m_l1_meas.set_ms_c_value(meas->ms_c_value); |
| 509 | if (meas->have_ms_sign_var) |
| 510 | m_l1_meas.set_ms_sign_var(meas->ms_sign_var); |
| 511 | |
| 512 | if (meas->have_ms_i_level) { |
| 513 | for (i = 0; i < ARRAY_SIZE(meas->ts); ++i) { |
| 514 | if (meas->ts[i].have_ms_i_level) |
| 515 | m_l1_meas.set_ms_i_level(i, meas->ts[i].ms_i_level); |
| 516 | else |
| 517 | m_l1_meas.ts[i].have_ms_i_level = 0; |
| 518 | } |
| 519 | } |
Jacob Erlbeck | e4bcb62 | 2015-06-08 11:26:38 +0200 | [diff] [blame] | 520 | } |
Jacob Erlbeck | 70b96aa | 2015-06-12 10:52:34 +0200 | [diff] [blame] | 521 | |
| 522 | uint8_t GprsMs::current_cs_dl() const |
| 523 | { |
| 524 | uint8_t cs = m_current_cs_dl; |
| 525 | size_t unencoded_octets; |
| 526 | |
| 527 | if (!m_bts) |
| 528 | return cs; |
| 529 | |
| 530 | unencoded_octets = m_llc_queue.octets(); |
| 531 | |
| 532 | /* If the DL TBF is active, add number of unencoded chunk octets */ |
| 533 | if (m_dl_tbf) |
| 534 | unencoded_octets = m_dl_tbf->m_llc.chunk_size(); |
| 535 | |
| 536 | /* There are many unencoded octets, don't reduce */ |
| 537 | if (unencoded_octets >= m_bts->bts_data()->cs_downgrade_threshold) |
| 538 | return cs; |
| 539 | |
| 540 | /* RF conditions are good, don't reduce */ |
| 541 | if (m_nack_rate_dl < m_bts->bts_data()->cs_adj_lower_limit) |
| 542 | return cs; |
| 543 | |
| 544 | /* The throughput would probably be better if the CS level was reduced */ |
| 545 | cs -= 1; |
| 546 | |
| 547 | /* CS-2 doesn't gain throughput with small packets, further reduce to CS-1 */ |
| 548 | if (cs == 2) |
| 549 | cs -= 1; |
| 550 | |
| 551 | return cs; |
| 552 | } |
| 553 | |
Jacob Erlbeck | 699b8dc | 2015-06-29 14:05:55 +0200 | [diff] [blame] | 554 | int GprsMs::first_common_ts() const |
| 555 | { |
| 556 | if (m_dl_tbf) |
| 557 | return m_dl_tbf->first_common_ts; |
| 558 | |
| 559 | if (m_ul_tbf) |
| 560 | return m_ul_tbf->first_common_ts; |
| 561 | |
| 562 | return -1; |
| 563 | } |
| 564 | |
Jacob Erlbeck | 617c712 | 2015-06-30 09:18:30 +0200 | [diff] [blame] | 565 | uint8_t GprsMs::dl_slots() const |
| 566 | { |
| 567 | uint8_t slots = 0; |
| 568 | |
| 569 | if (m_dl_tbf) |
| 570 | slots |= m_dl_tbf->dl_slots(); |
| 571 | |
| 572 | if (m_ul_tbf) |
| 573 | slots |= m_ul_tbf->dl_slots(); |
| 574 | |
| 575 | return slots; |
| 576 | } |
| 577 | |
| 578 | uint8_t GprsMs::ul_slots() const |
| 579 | { |
| 580 | uint8_t slots = 0; |
| 581 | |
| 582 | if (m_dl_tbf) |
| 583 | slots |= m_dl_tbf->ul_slots(); |
| 584 | |
| 585 | if (m_ul_tbf) |
| 586 | slots |= m_ul_tbf->ul_slots(); |
| 587 | |
| 588 | return slots; |
| 589 | } |
| 590 | |
Jacob Erlbeck | 23f93a1 | 2015-06-30 08:52:54 +0200 | [diff] [blame] | 591 | void GprsMs::set_reserved_slots(gprs_rlcmac_trx *trx, |
| 592 | uint8_t ul_slots, uint8_t dl_slots) |
| 593 | { |
| 594 | if (m_current_trx) { |
| 595 | m_current_trx->unreserve_slots(GPRS_RLCMAC_DL_TBF, |
| 596 | m_reserved_dl_slots); |
| 597 | m_current_trx->unreserve_slots(GPRS_RLCMAC_UL_TBF, |
| 598 | m_reserved_ul_slots); |
| 599 | m_reserved_dl_slots = 0; |
| 600 | m_reserved_ul_slots = 0; |
| 601 | } |
| 602 | m_current_trx = trx; |
| 603 | if (trx) { |
| 604 | m_reserved_dl_slots = dl_slots; |
| 605 | m_reserved_ul_slots = ul_slots; |
| 606 | m_current_trx->reserve_slots(GPRS_RLCMAC_DL_TBF, |
| 607 | m_reserved_dl_slots); |
| 608 | m_current_trx->reserve_slots(GPRS_RLCMAC_UL_TBF, |
| 609 | m_reserved_ul_slots); |
| 610 | } |
| 611 | } |
| 612 | |
Jacob Erlbeck | ac89a55 | 2015-06-29 14:18:46 +0200 | [diff] [blame] | 613 | gprs_rlcmac_tbf *GprsMs::tbf(enum gprs_rlcmac_tbf_direction dir) const |
| 614 | { |
| 615 | switch (dir) { |
| 616 | case GPRS_RLCMAC_DL_TBF: return m_dl_tbf; |
| 617 | case GPRS_RLCMAC_UL_TBF: return m_ul_tbf; |
| 618 | } |
| 619 | |
| 620 | return NULL; |
| 621 | } |