Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 1 | /* gprs_ms.c |
| 2 | * |
| 3 | * Copyright (C) 2015-2020 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 | #include "bts.h" |
| 24 | #include "tbf.h" |
| 25 | #include "tbf_ul.h" |
| 26 | #include "gprs_debug.h" |
| 27 | #include "gprs_codel.h" |
| 28 | #include "pcu_utils.h" |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 29 | #include "nacc_fsm.h" |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 30 | |
| 31 | #include <time.h> |
| 32 | |
| 33 | #include <osmocom/core/talloc.h> |
| 34 | #include <osmocom/core/utils.h> |
| 35 | #include <osmocom/core/timer.h> |
| 36 | #include <osmocom/gsm/protocol/gsm_04_08.h> |
| 37 | #include <osmocom/gsm/gsm48.h> |
| 38 | #include <osmocom/core/logging.h> |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 39 | #include <osmocom/core/stats.h> |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 40 | #include "coding_scheme.h" |
| 41 | |
| 42 | #define GPRS_CODEL_SLOW_INTERVAL_MS 4000 |
| 43 | |
| 44 | extern void *tall_pcu_ctx; |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 45 | static unsigned int next_ms_ctr_group_id; |
| 46 | |
| 47 | static const struct rate_ctr_desc ms_ctr_description[] = { |
| 48 | [MS_CTR_DL_CTRL_MSG_SCHED] = { "ms:dl_ctrl_msg_sched", "Amount of DL CTRL messages scheduled" }, |
| 49 | }; |
| 50 | |
Pau Espin Pedrol | f5a251b | 2021-01-12 20:57:56 +0100 | [diff] [blame] | 51 | static const struct rate_ctr_group_desc ms_ctrg_desc = { |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 52 | .group_name_prefix = "pcu:ms", |
| 53 | .group_description = "MS Statistics", |
| 54 | .class_id = OSMO_STATS_CLASS_SUBSCRIBER, |
| 55 | .num_ctr = ARRAY_SIZE(ms_ctr_description), |
| 56 | .ctr_desc = ms_ctr_description, |
| 57 | }; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 58 | |
| 59 | static int64_t now_msec() |
| 60 | { |
| 61 | struct timespec ts; |
| 62 | osmo_clock_gettime(CLOCK_MONOTONIC, &ts); |
| 63 | |
| 64 | return (int64_t)(ts.tv_sec) * 1000 + ts.tv_nsec / 1000000; |
| 65 | } |
| 66 | |
| 67 | void gprs_default_cb_ms_idle(struct GprsMs *ms) |
| 68 | { |
| 69 | talloc_free(ms); |
| 70 | } |
| 71 | |
| 72 | void gprs_default_cb_ms_active(struct GprsMs *ms) |
| 73 | { |
| 74 | /* do nothing */ |
| 75 | } |
| 76 | |
| 77 | static struct gpr_ms_callback gprs_default_cb = { |
| 78 | .ms_idle = gprs_default_cb_ms_idle, |
| 79 | .ms_active = gprs_default_cb_ms_active, |
| 80 | }; |
| 81 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 82 | static void ms_release_timer_cb(void *data) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 83 | { |
| 84 | struct GprsMs *ms = (struct GprsMs *) data; |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 85 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Release timer expired\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 86 | |
| 87 | if (ms->timer.data) { |
| 88 | ms->timer.data = NULL; |
| 89 | ms_unref(ms); |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | static int ms_talloc_destructor(struct GprsMs *ms); |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 94 | struct GprsMs *ms_alloc(struct gprs_rlcmac_bts *bts, uint32_t tlli) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 95 | { |
| 96 | struct GprsMs *ms = talloc_zero(tall_pcu_ctx, struct GprsMs); |
| 97 | |
| 98 | talloc_set_destructor(ms, ms_talloc_destructor); |
| 99 | |
| 100 | ms->bts = bts; |
| 101 | ms->cb = gprs_default_cb; |
| 102 | ms->tlli = tlli; |
| 103 | ms->new_ul_tlli = GSM_RESERVED_TMSI; |
| 104 | ms->new_dl_tlli = GSM_RESERVED_TMSI; |
| 105 | ms->ta = GSM48_TA_INVALID; |
| 106 | ms->current_cs_ul = UNKNOWN; |
| 107 | ms->current_cs_dl = UNKNOWN; |
| 108 | ms->is_idle = true; |
| 109 | INIT_LLIST_HEAD(&ms->list); |
| 110 | INIT_LLIST_HEAD(&ms->old_tbfs); |
| 111 | |
| 112 | int codel_interval = LLC_CODEL_USE_DEFAULT; |
| 113 | |
| 114 | LOGP(DRLCMAC, LOGL_INFO, "Creating MS object, TLLI = 0x%08x\n", tlli); |
| 115 | |
| 116 | ms->imsi[0] = '\0'; |
| 117 | memset(&ms->timer, 0, sizeof(ms->timer)); |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 118 | ms->timer.cb = ms_release_timer_cb; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 119 | llc_queue_init(&ms->llc_queue); |
| 120 | |
| 121 | ms_set_mode(ms, GPRS); |
| 122 | |
| 123 | if (ms->bts) |
Pau Espin Pedrol | f473ec9 | 2021-01-14 14:45:14 +0100 | [diff] [blame] | 124 | codel_interval = the_pcu->vty.llc_codel_interval_msec; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 125 | |
| 126 | if (codel_interval) { |
| 127 | if (codel_interval == LLC_CODEL_USE_DEFAULT) |
| 128 | codel_interval = GPRS_CODEL_SLOW_INTERVAL_MS; |
| 129 | ms->codel_state = talloc(ms, struct gprs_codel); |
| 130 | gprs_codel_init(ms->codel_state); |
| 131 | gprs_codel_set_interval(ms->codel_state, codel_interval); |
| 132 | } |
| 133 | ms->last_cs_not_low = now_msec(); |
| 134 | ms->app_info_pending = false; |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 135 | |
| 136 | ms->ctrs = rate_ctr_group_alloc(ms, &ms_ctrg_desc, next_ms_ctr_group_id++); |
| 137 | if (!ms->ctrs) |
| 138 | goto free_ret; |
| 139 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 140 | return ms; |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 141 | free_ret: |
| 142 | talloc_free(ms); |
| 143 | return NULL; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | static int ms_talloc_destructor(struct GprsMs *ms) |
| 147 | { |
| 148 | struct llist_item *pos, *tmp; |
| 149 | |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 150 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Destroying MS object\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 151 | |
| 152 | ms_set_reserved_slots(ms, NULL, 0, 0); |
| 153 | |
| 154 | if (osmo_timer_pending(&ms->timer)) |
| 155 | osmo_timer_del(&ms->timer); |
| 156 | |
| 157 | if (ms->ul_tbf) { |
| 158 | tbf_set_ms((struct gprs_rlcmac_tbf *)ms->ul_tbf, NULL); |
| 159 | ms->ul_tbf = NULL; |
| 160 | } |
| 161 | |
| 162 | if (ms->dl_tbf) { |
| 163 | tbf_set_ms((struct gprs_rlcmac_tbf *)ms->dl_tbf, NULL); |
| 164 | ms->dl_tbf = NULL; |
| 165 | } |
| 166 | |
| 167 | llist_for_each_entry_safe(pos, tmp, &ms->old_tbfs, list) { |
| 168 | struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)pos->entry; |
| 169 | tbf_set_ms(tbf, NULL); |
| 170 | } |
| 171 | |
| 172 | llc_queue_clear(&ms->llc_queue, ms->bts); |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 173 | |
| 174 | if (ms->ctrs) |
| 175 | rate_ctr_group_free(ms->ctrs); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | |
| 180 | void ms_set_callback(struct GprsMs *ms, struct gpr_ms_callback *cb) |
| 181 | { |
| 182 | if (cb) |
| 183 | ms->cb = *cb; |
| 184 | else |
| 185 | ms->cb = gprs_default_cb; |
| 186 | } |
| 187 | |
| 188 | static void ms_update_status(struct GprsMs *ms) |
| 189 | { |
| 190 | if (ms->ref > 0) |
| 191 | return; |
| 192 | |
| 193 | if (ms_is_idle(ms) && !ms->is_idle) { |
| 194 | ms->is_idle = true; |
| 195 | ms->cb.ms_idle(ms); |
| 196 | /* this can be deleted by now, do not access it */ |
| 197 | return; |
| 198 | } |
| 199 | |
| 200 | if (!ms_is_idle(ms) && ms->is_idle) { |
| 201 | ms->is_idle = false; |
| 202 | ms->cb.ms_active(ms); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | struct GprsMs *ms_ref(struct GprsMs *ms) |
| 207 | { |
| 208 | ms->ref += 1; |
| 209 | return ms; |
| 210 | } |
| 211 | |
| 212 | void ms_unref(struct GprsMs *ms) |
| 213 | { |
| 214 | OSMO_ASSERT(ms->ref >= 0); |
| 215 | ms->ref -= 1; |
| 216 | if (ms->ref == 0) |
| 217 | ms_update_status(ms); |
| 218 | } |
| 219 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 220 | static void ms_release_timer_start(struct GprsMs *ms) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 221 | { |
| 222 | if (ms->delay == 0) |
| 223 | return; |
| 224 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 225 | LOGPMS(ms, DRLCMAC, LOGL_DEBUG, "Schedule MS release in %u secs\n", ms->delay); |
| 226 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 227 | if (!ms->timer.data) |
| 228 | ms->timer.data = ms_ref(ms); |
| 229 | |
| 230 | osmo_timer_schedule(&ms->timer, ms->delay, 0); |
| 231 | } |
| 232 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 233 | static void ms_release_timer_stop(struct GprsMs *ms) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 234 | { |
| 235 | if (!ms->timer.data) |
| 236 | return; |
| 237 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 238 | LOGPMS(ms, DRLCMAC, LOGL_DEBUG, "Cancel scheduled MS release\n"); |
| 239 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 240 | osmo_timer_del(&ms->timer); |
| 241 | ms->timer.data = NULL; |
| 242 | ms_unref(ms); |
| 243 | } |
| 244 | |
| 245 | void ms_set_mode(struct GprsMs *ms, enum mcs_kind mode) |
| 246 | { |
| 247 | ms->mode = mode; |
| 248 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 249 | switch (ms->mode) { |
| 250 | case GPRS: |
| 251 | if (!mcs_is_gprs(ms->current_cs_ul)) { |
| 252 | ms->current_cs_ul = mcs_get_gprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 253 | ms->bts->initial_cs_ul); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 254 | if (!mcs_is_valid(ms->current_cs_ul)) |
| 255 | ms->current_cs_ul = CS1; |
| 256 | } |
| 257 | if (!mcs_is_gprs(ms->current_cs_dl)) { |
| 258 | ms->current_cs_dl = mcs_get_gprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 259 | ms->bts->initial_cs_dl); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 260 | if (!mcs_is_valid(ms->current_cs_dl)) |
| 261 | ms->current_cs_dl = CS1; |
| 262 | } |
| 263 | break; |
| 264 | |
| 265 | case EGPRS_GMSK: |
Pau Espin Pedrol | 7bb8cd6 | 2021-01-25 15:08:35 +0100 | [diff] [blame] | 266 | if (!mcs_is_edge_gmsk(ms->current_cs_ul)) { |
| 267 | ms->current_cs_ul = mcs_get_egprs_by_num( |
| 268 | ms->bts->initial_mcs_ul); |
| 269 | if (!mcs_is_valid(ms->current_cs_ul)) |
| 270 | ms->current_cs_ul = MCS1; |
| 271 | } |
| 272 | if (!mcs_is_edge_gmsk(ms->current_cs_dl)) { |
| 273 | ms->current_cs_dl = mcs_get_egprs_by_num( |
| 274 | ms->bts->initial_mcs_dl); |
| 275 | if (!mcs_is_valid(ms->current_cs_dl)) |
| 276 | ms->current_cs_dl = MCS1; |
| 277 | } |
| 278 | break; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 279 | case EGPRS: |
| 280 | if (!mcs_is_edge(ms->current_cs_ul)) { |
| 281 | ms->current_cs_ul = mcs_get_egprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 282 | ms->bts->initial_mcs_ul); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 283 | if (!mcs_is_valid(ms->current_cs_ul)) |
| 284 | ms->current_cs_ul = MCS1; |
| 285 | } |
| 286 | if (!mcs_is_edge(ms->current_cs_dl)) { |
| 287 | ms->current_cs_dl = mcs_get_egprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 288 | ms->bts->initial_mcs_dl); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 289 | if (!mcs_is_valid(ms->current_cs_dl)) |
| 290 | ms->current_cs_dl = MCS1; |
| 291 | } |
| 292 | break; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | static void ms_attach_ul_tbf(struct GprsMs *ms, struct gprs_rlcmac_ul_tbf *tbf) |
| 297 | { |
| 298 | if (ms->ul_tbf == tbf) |
| 299 | return; |
| 300 | |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 301 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Attaching UL TBF: %s\n", tbf_name((struct gprs_rlcmac_tbf *)tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 302 | |
| 303 | ms_ref(ms); |
| 304 | |
| 305 | if (ms->ul_tbf) |
| 306 | llist_add_tail(tbf_ms_list((struct gprs_rlcmac_tbf *)ms->ul_tbf), &ms->old_tbfs); |
| 307 | |
| 308 | ms->ul_tbf = tbf; |
| 309 | |
| 310 | if (tbf) |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 311 | ms_release_timer_stop(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 312 | |
| 313 | ms_unref(ms); |
| 314 | } |
| 315 | |
| 316 | static void ms_attach_dl_tbf(struct GprsMs *ms, struct gprs_rlcmac_dl_tbf *tbf) |
| 317 | { |
| 318 | if (ms->dl_tbf == tbf) |
| 319 | return; |
| 320 | |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 321 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Attaching DL TBF: %s\n", tbf_name((struct gprs_rlcmac_tbf *)tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 322 | |
| 323 | ms_ref(ms); |
| 324 | |
| 325 | if (ms->dl_tbf) |
| 326 | llist_add_tail(tbf_ms_list((struct gprs_rlcmac_tbf *)ms->dl_tbf), &ms->old_tbfs); |
| 327 | |
| 328 | ms->dl_tbf = tbf; |
| 329 | |
| 330 | if (tbf) |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 331 | ms_release_timer_stop(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 332 | |
| 333 | ms_unref(ms); |
| 334 | } |
| 335 | |
| 336 | void ms_attach_tbf(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf) |
| 337 | { |
Pau Espin Pedrol | b5fece9 | 2021-08-23 16:58:04 +0200 | [diff] [blame] | 338 | if (tbf_direction(tbf) == GPRS_RLCMAC_DL_TBF) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 339 | ms_attach_dl_tbf(ms, as_dl_tbf(tbf)); |
Pau Espin Pedrol | b5fece9 | 2021-08-23 16:58:04 +0200 | [diff] [blame] | 340 | else |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 341 | ms_attach_ul_tbf(ms, as_ul_tbf(tbf)); |
| 342 | } |
| 343 | |
| 344 | void ms_detach_tbf(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf) |
| 345 | { |
| 346 | if (tbf == (struct gprs_rlcmac_tbf *)(ms->ul_tbf)) { |
| 347 | ms->ul_tbf = NULL; |
| 348 | } else if (tbf == (struct gprs_rlcmac_tbf *)(ms->dl_tbf)) { |
| 349 | ms->dl_tbf = NULL; |
| 350 | } else { |
| 351 | bool found = false; |
| 352 | |
| 353 | struct llist_item *pos, *tmp; |
| 354 | llist_for_each_entry_safe(pos, tmp, &ms->old_tbfs, list) { |
| 355 | struct gprs_rlcmac_tbf *tmp_tbf = (struct gprs_rlcmac_tbf *)pos->entry; |
| 356 | if (tmp_tbf == tbf) { |
| 357 | llist_del(&pos->list); |
| 358 | found = true; |
| 359 | break; |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | /* Protect against recursive calls via set_ms() */ |
| 364 | if (!found) |
| 365 | return; |
| 366 | } |
| 367 | |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 368 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Detaching TBF: %s\n", |
| 369 | tbf_name(tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 370 | |
| 371 | if (tbf_ms(tbf) == ms) |
| 372 | tbf_set_ms(tbf, NULL); |
| 373 | |
| 374 | if (!ms->dl_tbf && !ms->ul_tbf) { |
| 375 | ms_set_reserved_slots(ms, NULL, 0, 0); |
| 376 | |
| 377 | if (ms_tlli(ms) != 0) |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 378 | ms_release_timer_start(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | ms_update_status(ms); |
| 382 | } |
| 383 | |
| 384 | void ms_reset(struct GprsMs *ms) |
| 385 | { |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 386 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Clearing MS object\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 387 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 388 | ms_release_timer_stop(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 389 | |
| 390 | ms->tlli = GSM_RESERVED_TMSI; |
| 391 | ms->new_dl_tlli = ms->tlli; |
| 392 | ms->new_ul_tlli = ms->tlli; |
| 393 | ms->imsi[0] = '\0'; |
| 394 | } |
| 395 | |
| 396 | static void ms_merge_old_ms(struct GprsMs *ms, struct GprsMs *old_ms) |
| 397 | { |
| 398 | OSMO_ASSERT(old_ms != ms); |
| 399 | |
| 400 | if (strlen(ms_imsi(ms)) == 0 && strlen(ms_imsi(old_ms)) != 0) |
| 401 | osmo_strlcpy(ms->imsi, ms_imsi(old_ms), sizeof(ms->imsi)); |
| 402 | |
| 403 | if (!ms_ms_class(ms) && ms_ms_class(old_ms)) |
| 404 | ms_set_ms_class(ms, ms_ms_class(old_ms)); |
| 405 | |
| 406 | if (!ms_egprs_ms_class(ms) && ms_egprs_ms_class(old_ms)) |
| 407 | ms_set_egprs_ms_class(ms, ms_egprs_ms_class(old_ms)); |
| 408 | |
| 409 | llc_queue_move_and_merge(&ms->llc_queue, &old_ms->llc_queue); |
| 410 | |
| 411 | ms_reset(old_ms); |
| 412 | } |
| 413 | |
| 414 | void ms_merge_and_clear_ms(struct GprsMs *ms, struct GprsMs *old_ms) |
| 415 | { |
| 416 | OSMO_ASSERT(old_ms != ms); |
| 417 | |
| 418 | ms_ref(old_ms); |
| 419 | |
| 420 | /* Clean up the old MS object */ |
| 421 | /* TODO: Use timer? */ |
| 422 | if (ms_ul_tbf(old_ms) && !tbf_timers_pending((struct gprs_rlcmac_tbf *)ms_ul_tbf(old_ms), T_MAX)) |
| 423 | tbf_free((struct gprs_rlcmac_tbf *)ms_ul_tbf(old_ms)); |
| 424 | if (ms_dl_tbf(old_ms) && !tbf_timers_pending((struct gprs_rlcmac_tbf *)ms_dl_tbf(old_ms), T_MAX)) |
| 425 | tbf_free((struct gprs_rlcmac_tbf *)ms_dl_tbf(old_ms)); |
| 426 | |
| 427 | ms_merge_old_ms(ms, old_ms); |
| 428 | |
| 429 | ms_unref(old_ms); |
| 430 | } |
| 431 | |
| 432 | void ms_set_tlli(struct GprsMs *ms, uint32_t tlli) |
| 433 | { |
| 434 | if (tlli == ms->tlli || tlli == ms->new_ul_tlli) |
| 435 | return; |
| 436 | |
| 437 | if (tlli != ms->new_dl_tlli) { |
| 438 | LOGP(DRLCMAC, LOGL_INFO, |
| 439 | "Modifying MS object, UL TLLI: 0x%08x -> 0x%08x, " |
| 440 | "not yet confirmed\n", |
| 441 | ms_tlli(ms), tlli); |
| 442 | ms->new_ul_tlli = tlli; |
| 443 | return; |
| 444 | } |
| 445 | |
| 446 | LOGP(DRLCMAC, LOGL_INFO, |
| 447 | "Modifying MS object, TLLI: 0x%08x -> 0x%08x, " |
| 448 | "already confirmed partly\n", |
| 449 | ms->tlli, tlli); |
| 450 | |
| 451 | ms->tlli = tlli; |
| 452 | ms->new_dl_tlli = GSM_RESERVED_TMSI; |
| 453 | ms->new_ul_tlli = GSM_RESERVED_TMSI; |
| 454 | } |
| 455 | |
| 456 | bool ms_confirm_tlli(struct GprsMs *ms, uint32_t tlli) |
| 457 | { |
| 458 | if (tlli == ms->tlli || tlli == ms->new_dl_tlli) |
| 459 | return false; |
| 460 | |
| 461 | if (tlli != ms->new_ul_tlli) { |
| 462 | /* The MS has not sent a message with the new TLLI, which may |
| 463 | * happen according to the spec [TODO: add reference]. */ |
| 464 | |
| 465 | LOGP(DRLCMAC, LOGL_INFO, |
| 466 | "The MS object cannot fully confirm an unexpected TLLI: 0x%08x, " |
| 467 | "partly confirmed\n", tlli); |
| 468 | /* Use the network's idea of TLLI as candidate, this does not |
| 469 | * change the result value of tlli() */ |
| 470 | ms->new_dl_tlli = tlli; |
| 471 | return false; |
| 472 | } |
| 473 | |
| 474 | LOGP(DRLCMAC, LOGL_INFO, |
| 475 | "Modifying MS object, TLLI: 0x%08x confirmed\n", tlli); |
| 476 | |
| 477 | ms->tlli = tlli; |
| 478 | ms->new_dl_tlli = GSM_RESERVED_TMSI; |
| 479 | ms->new_ul_tlli = GSM_RESERVED_TMSI; |
| 480 | |
| 481 | return true; |
| 482 | } |
| 483 | |
| 484 | void ms_set_imsi(struct GprsMs *ms, const char *imsi) |
| 485 | { |
| 486 | if (!imsi) { |
| 487 | LOGP(DRLCMAC, LOGL_ERROR, "Expected IMSI!\n"); |
| 488 | return; |
| 489 | } |
| 490 | |
| 491 | if (imsi[0] && strlen(imsi) < 3) { |
| 492 | LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI '%s'!\n", |
| 493 | imsi); |
| 494 | return; |
| 495 | } |
| 496 | |
| 497 | if (strcmp(imsi, ms->imsi) == 0) |
| 498 | return; |
| 499 | |
| 500 | LOGP(DRLCMAC, LOGL_INFO, |
| 501 | "Modifying MS object, TLLI = 0x%08x, IMSI '%s' -> '%s'\n", |
| 502 | ms_tlli(ms), ms->imsi, imsi); |
| 503 | |
| 504 | struct GprsMs *old_ms = bts_ms_by_imsi(ms->bts, imsi); |
| 505 | /* Check if we are going to store a different MS object with already |
| 506 | existing IMSI. This is probably a bug in code calling this function, |
| 507 | since it should take care of this explicitly */ |
| 508 | if (old_ms) { |
| 509 | /* We cannot find ms->ms by IMSI since we know that it has a |
| 510 | * different IMSI */ |
| 511 | OSMO_ASSERT(old_ms != ms); |
| 512 | |
| 513 | LOGPMS(ms, DRLCMAC, LOGL_NOTICE, |
| 514 | "IMSI '%s' was already assigned to another " |
| 515 | "MS object: TLLI = 0x%08x, that IMSI will be removed\n", |
| 516 | imsi, ms_tlli(old_ms)); |
| 517 | |
| 518 | ms_merge_and_clear_ms(ms, old_ms); |
| 519 | } |
| 520 | |
| 521 | |
| 522 | osmo_strlcpy(ms->imsi, imsi, sizeof(ms->imsi)); |
| 523 | } |
| 524 | |
| 525 | void ms_set_ta(struct GprsMs *ms, uint8_t ta_) |
| 526 | { |
| 527 | if (ta_ == ms->ta) |
| 528 | return; |
| 529 | |
| 530 | if (gsm48_ta_is_valid(ta_)) { |
| 531 | LOGP(DRLCMAC, LOGL_INFO, |
| 532 | "Modifying MS object, TLLI = 0x%08x, TA %d -> %d\n", |
| 533 | ms_tlli(ms), ms->ta, ta_); |
| 534 | ms->ta = ta_; |
| 535 | } else |
| 536 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 537 | "MS object, TLLI = 0x%08x, invalid TA %d rejected (old " |
| 538 | "value %d kept)\n", ms_tlli(ms), ta_, ms->ta); |
| 539 | } |
| 540 | |
| 541 | void ms_set_ms_class(struct GprsMs *ms, uint8_t ms_class_) |
| 542 | { |
| 543 | if (ms_class_ == ms->ms_class) |
| 544 | return; |
| 545 | |
| 546 | LOGP(DRLCMAC, LOGL_INFO, |
| 547 | "Modifying MS object, TLLI = 0x%08x, MS class %d -> %d\n", |
| 548 | ms_tlli(ms), ms->ms_class, ms_class_); |
| 549 | |
| 550 | ms->ms_class = ms_class_; |
| 551 | } |
| 552 | |
| 553 | void ms_set_egprs_ms_class(struct GprsMs *ms, uint8_t ms_class_) |
| 554 | { |
| 555 | if (ms_class_ == ms->egprs_ms_class) |
| 556 | return; |
| 557 | |
| 558 | LOGP(DRLCMAC, LOGL_INFO, |
| 559 | "Modifying MS object, TLLI = 0x%08x, EGPRS MS class %d -> %d\n", |
| 560 | ms_tlli(ms), ms->egprs_ms_class, ms_class_); |
| 561 | |
| 562 | ms->egprs_ms_class = ms_class_; |
| 563 | |
| 564 | if (!bts_max_mcs_ul(ms->bts) || !bts_max_mcs_dl(ms->bts)) { |
| 565 | LOGPMS(ms, DRLCMAC, LOGL_DEBUG, |
| 566 | "Avoid enabling EGPRS because use of MCS is disabled: ul=%u dl=%u\n", |
| 567 | bts_max_mcs_ul(ms->bts), bts_max_mcs_dl(ms->bts)); |
| 568 | return; |
| 569 | } |
| 570 | |
| 571 | if (mcs_is_edge_gmsk(mcs_get_egprs_by_num(bts_max_mcs_ul(ms->bts))) && |
| 572 | mcs_is_edge_gmsk(mcs_get_egprs_by_num(bts_max_mcs_dl(ms->bts))) && |
| 573 | ms_mode(ms) != EGPRS) |
| 574 | { |
| 575 | ms_set_mode(ms, EGPRS_GMSK); |
| 576 | } else { |
| 577 | ms_set_mode(ms, EGPRS); |
| 578 | } |
| 579 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Enabled EGPRS, mode %s\n", mode_name(ms_mode(ms))); |
| 580 | } |
| 581 | |
| 582 | void ms_update_error_rate(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf, int error_rate) |
| 583 | { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 584 | int64_t now; |
| 585 | enum CodingScheme max_cs_dl = ms_max_cs_dl(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 586 | OSMO_ASSERT(max_cs_dl); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 587 | |
| 588 | if (error_rate < 0) |
| 589 | return; |
| 590 | |
| 591 | now = now_msec(); |
| 592 | |
| 593 | /* TODO: Check for TBF direction */ |
| 594 | /* TODO: Support different CS values for UL and DL */ |
| 595 | |
| 596 | ms->nack_rate_dl = error_rate; |
| 597 | |
Pau Espin Pedrol | e8dcf64 | 2021-01-14 13:17:01 +0100 | [diff] [blame] | 598 | if (error_rate > the_pcu->vty.cs_adj_upper_limit) { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 599 | if (mcs_chan_code(ms->current_cs_dl) > 0) { |
| 600 | mcs_dec_kind(&ms->current_cs_dl, ms_mode(ms)); |
| 601 | LOGP(DRLCMACDL, LOGL_INFO, |
| 602 | "MS (IMSI %s): High error rate %d%%, " |
| 603 | "reducing CS level to %s\n", |
| 604 | ms_imsi(ms), error_rate, mcs_name(ms->current_cs_dl)); |
| 605 | ms->last_cs_not_low = now; |
| 606 | } |
Pau Espin Pedrol | e8dcf64 | 2021-01-14 13:17:01 +0100 | [diff] [blame] | 607 | } else if (error_rate < the_pcu->vty.cs_adj_lower_limit) { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 608 | if (ms->current_cs_dl < max_cs_dl) { |
| 609 | if (now - ms->last_cs_not_low > 1000) { |
| 610 | mcs_inc_kind(&ms->current_cs_dl, ms_mode(ms)); |
| 611 | |
| 612 | LOGP(DRLCMACDL, LOGL_INFO, |
| 613 | "MS (IMSI %s): Low error rate %d%%, " |
| 614 | "increasing DL CS level to %s\n", |
| 615 | ms_imsi(ms), error_rate, |
| 616 | mcs_name(ms->current_cs_dl)); |
| 617 | ms->last_cs_not_low = now; |
| 618 | } else { |
| 619 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 620 | "MS (IMSI %s): Low error rate %d%%, " |
| 621 | "ignored (within blocking period)\n", |
| 622 | ms_imsi(ms), error_rate); |
| 623 | } |
| 624 | } |
| 625 | } else { |
| 626 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 627 | "MS (IMSI %s): Medium error rate %d%%, ignored\n", |
| 628 | ms_imsi(ms), error_rate); |
| 629 | ms->last_cs_not_low = now; |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | enum CodingScheme ms_max_cs_ul(const struct GprsMs *ms) |
| 634 | { |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 635 | enum CodingScheme cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 636 | OSMO_ASSERT(ms->bts != NULL); |
| 637 | |
| 638 | if (mcs_is_gprs(ms->current_cs_ul)) { |
| 639 | if (!bts_max_cs_ul(ms->bts)) { |
| 640 | return CS4; |
| 641 | } |
| 642 | |
| 643 | return mcs_get_gprs_by_num(bts_max_cs_ul(ms->bts)); |
| 644 | } |
| 645 | |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 646 | cs = mcs_get_egprs_by_num(bts_max_mcs_ul(ms->bts)); |
| 647 | if (ms_mode(ms) == EGPRS_GMSK && cs > MCS4) |
| 648 | cs = MCS4; |
| 649 | return cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 650 | } |
| 651 | |
| 652 | void ms_set_current_cs_dl(struct GprsMs *ms, enum CodingScheme scheme) |
| 653 | { |
| 654 | ms->current_cs_dl = scheme; |
| 655 | } |
| 656 | |
| 657 | enum CodingScheme ms_max_cs_dl(const struct GprsMs *ms) |
| 658 | { |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 659 | enum CodingScheme cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 660 | OSMO_ASSERT(ms->bts != NULL); |
| 661 | |
| 662 | if (mcs_is_gprs(ms->current_cs_dl)) { |
| 663 | if (!bts_max_cs_dl(ms->bts)) { |
| 664 | return CS4; |
| 665 | } |
| 666 | |
| 667 | return mcs_get_gprs_by_num(bts_max_cs_dl(ms->bts)); |
| 668 | } |
| 669 | |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 670 | cs = mcs_get_egprs_by_num(bts_max_mcs_dl(ms->bts)); |
| 671 | if (ms_mode(ms) == EGPRS_GMSK && cs > MCS4) |
| 672 | cs = MCS4; |
| 673 | return cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 674 | } |
| 675 | |
| 676 | void ms_update_cs_ul(struct GprsMs *ms, const struct pcu_l1_meas *meas) |
| 677 | { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 678 | enum CodingScheme max_cs_ul = ms_max_cs_ul(ms); |
| 679 | |
| 680 | int old_link_qual; |
| 681 | int low; |
| 682 | int high; |
| 683 | enum CodingScheme new_cs_ul = ms->current_cs_ul; |
| 684 | uint8_t current_cs = mcs_chan_code(ms->current_cs_ul); |
| 685 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 686 | if (!max_cs_ul) { |
| 687 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 688 | "max_cs_ul cannot be derived (current UL CS: %s)\n", |
| 689 | mcs_name(ms->current_cs_ul)); |
| 690 | return; |
| 691 | } |
| 692 | |
| 693 | if (!ms->current_cs_ul) { |
| 694 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 695 | "Unable to update UL (M)CS because it's not set: %s\n", |
| 696 | mcs_name(ms->current_cs_ul)); |
| 697 | return; |
| 698 | } |
| 699 | |
| 700 | if (!meas->have_link_qual) { |
| 701 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 702 | "Unable to update UL (M)CS %s because we don't have link quality measurements.\n", |
| 703 | mcs_name(ms->current_cs_ul)); |
| 704 | return; |
| 705 | } |
| 706 | |
| 707 | if (mcs_is_gprs(ms->current_cs_ul)) { |
| 708 | if (current_cs >= MAX_GPRS_CS) |
| 709 | current_cs = MAX_GPRS_CS - 1; |
Pau Espin Pedrol | 54b159a | 2021-01-14 13:30:04 +0100 | [diff] [blame] | 710 | low = the_pcu->vty.cs_lqual_ranges[current_cs].low; |
| 711 | high = the_pcu->vty.cs_lqual_ranges[current_cs].high; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 712 | } else if (mcs_is_edge(ms->current_cs_ul)) { |
| 713 | if (current_cs >= MAX_EDGE_MCS) |
| 714 | current_cs = MAX_EDGE_MCS - 1; |
Pau Espin Pedrol | 54b159a | 2021-01-14 13:30:04 +0100 | [diff] [blame] | 715 | low = the_pcu->vty.mcs_lqual_ranges[current_cs].low; |
| 716 | high = the_pcu->vty.mcs_lqual_ranges[current_cs].high; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 717 | } else { |
| 718 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 719 | "Unable to update UL (M)CS because it's neither GPRS nor EDGE: %s\n", |
| 720 | mcs_name(ms->current_cs_ul)); |
| 721 | return; |
| 722 | } |
| 723 | |
| 724 | /* To avoid rapid changes of the coding scheme, we also take |
| 725 | * the old link quality value into account (if present). */ |
| 726 | if (ms->l1_meas.have_link_qual) |
| 727 | old_link_qual = ms->l1_meas.link_qual; |
| 728 | else |
| 729 | old_link_qual = meas->link_qual; |
| 730 | |
| 731 | if (meas->link_qual < low && old_link_qual < low) |
| 732 | mcs_dec_kind(&new_cs_ul, ms_mode(ms)); |
| 733 | else if (meas->link_qual > high && old_link_qual > high && |
| 734 | ms->current_cs_ul < max_cs_ul) |
| 735 | mcs_inc_kind(&new_cs_ul, ms_mode(ms)); |
| 736 | |
| 737 | if (ms->current_cs_ul != new_cs_ul) { |
| 738 | LOGPMS(ms, DRLCMACMEAS, LOGL_INFO, |
| 739 | "Link quality %ddB (old %ddB) left window [%d, %d], " |
| 740 | "modifying uplink CS level: %s -> %s\n", |
| 741 | meas->link_qual, old_link_qual, |
| 742 | low, high, |
| 743 | mcs_name(ms->current_cs_ul), mcs_name(new_cs_ul)); |
| 744 | |
| 745 | ms->current_cs_ul = new_cs_ul; |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | void ms_update_l1_meas(struct GprsMs *ms, const struct pcu_l1_meas *meas) |
| 750 | { |
| 751 | unsigned i; |
| 752 | |
| 753 | ms_update_cs_ul(ms, meas); |
| 754 | |
| 755 | if (meas->have_rssi) |
| 756 | pcu_l1_meas_set_rssi(&ms->l1_meas, meas->rssi); |
| 757 | if (meas->have_bto) |
| 758 | pcu_l1_meas_set_bto(&ms->l1_meas, meas->bto); |
| 759 | if (meas->have_ber) |
| 760 | pcu_l1_meas_set_ber(&ms->l1_meas, meas->ber); |
| 761 | if (meas->have_link_qual) |
| 762 | pcu_l1_meas_set_link_qual(&ms->l1_meas, meas->link_qual); |
| 763 | |
| 764 | if (meas->have_ms_rx_qual) |
| 765 | pcu_l1_meas_set_ms_rx_qual(&ms->l1_meas, meas->ms_rx_qual); |
| 766 | if (meas->have_ms_c_value) |
| 767 | pcu_l1_meas_set_ms_c_value(&ms->l1_meas, meas->ms_c_value); |
| 768 | if (meas->have_ms_sign_var) |
| 769 | pcu_l1_meas_set_ms_sign_var(&ms->l1_meas, meas->ms_sign_var); |
| 770 | |
| 771 | if (meas->have_ms_i_level) { |
| 772 | for (i = 0; i < ARRAY_SIZE(meas->ts); ++i) { |
| 773 | if (meas->ts[i].have_ms_i_level) |
| 774 | pcu_l1_meas_set_ms_i_level(&ms->l1_meas, i, meas->ts[i].ms_i_level); |
| 775 | else |
| 776 | ms->l1_meas.ts[i].have_ms_i_level = 0; |
| 777 | } |
| 778 | } |
| 779 | } |
| 780 | |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 781 | /* req_mcs_kind acts as a set filter, where EGPRS means any and GPRS is the most restrictive */ |
| 782 | enum CodingScheme ms_current_cs_dl(const struct GprsMs *ms, enum mcs_kind req_mcs_kind) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 783 | { |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 784 | enum CodingScheme orig_cs = ms->current_cs_dl; |
| 785 | struct gprs_rlcmac_bts *bts = ms->bts; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 786 | size_t unencoded_octets; |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 787 | enum CodingScheme cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 788 | |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 789 | /* It could be that a TBF requests a GPRS CS despite the MS currently |
| 790 | being upgraded to EGPRS (hence reporting MCS). That could happen |
| 791 | because the TBF was created early in the process where we didn't have |
| 792 | yet enough information about the MS, and only AFTER it was created we |
| 793 | upgraded the MS to be EGPRS capable. |
| 794 | As a result, when the MS is queried for the target CS here, we could be |
| 795 | returning an MCS despite the current TBF being established as GPRS, |
| 796 | but we rather stick to the TBF type we assigned to the MS rather than |
| 797 | magically sending EGPRS data blocks to a GPRS TBF. |
| 798 | It could also be that the caller requests specific MCS kind |
| 799 | explicitly too due to scheduling restrictions (GPRS+EGPRS multiplexing). */ |
| 800 | if (req_mcs_kind == EGPRS_GMSK && mcs_is_edge(orig_cs) && orig_cs > MCS4) { |
| 801 | cs = bts_cs_dl_is_supported(bts, MCS4) ? MCS4 : |
| 802 | bts_cs_dl_is_supported(bts, MCS3) ? MCS3 : |
| 803 | bts_cs_dl_is_supported(bts, MCS2) ? MCS2 : |
| 804 | MCS1; |
| 805 | } else if (req_mcs_kind == GPRS && mcs_is_edge(orig_cs)) { /* GPRS */ |
| 806 | int i; |
| 807 | cs = orig_cs > MCS4 ? MCS4 : orig_cs; |
| 808 | cs -= (MCS1 - CS1); /* MCSx -> CSx */ |
| 809 | /* Find suitable CS starting from equivalent MCS which is supported by BTS: */ |
| 810 | for (i = mcs_chan_code(cs); !bts_cs_dl_is_supported(bts, CS1 + i); i--); |
| 811 | OSMO_ASSERT(i >= 0 && i <= 3); /* CS1 is always supported */ |
| 812 | cs = CS1 + i; |
| 813 | } else { |
| 814 | cs = orig_cs; |
| 815 | } |
| 816 | |
| 817 | if (orig_cs != cs) |
| 818 | LOGPMS(ms, DRLCMACDL, LOGL_INFO, "MS (mode=%s) suggests transmitting " |
| 819 | "DL %s, downgrade to %s in order to match TBF & scheduler requirements\n", |
| 820 | mode_name(ms_mode(ms)), mcs_name(orig_cs), mcs_name(cs)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 821 | |
| 822 | unencoded_octets = llc_queue_octets(&ms->llc_queue); |
| 823 | |
| 824 | /* If the DL TBF is active, add number of unencoded chunk octets */ |
| 825 | if (ms->dl_tbf) |
| 826 | unencoded_octets += llc_chunk_size(tbf_llc((struct gprs_rlcmac_tbf *)ms->dl_tbf)); |
| 827 | |
| 828 | /* There are many unencoded octets, don't reduce */ |
Pau Espin Pedrol | ad79b85 | 2021-01-14 13:20:55 +0100 | [diff] [blame] | 829 | if (unencoded_octets >= the_pcu->vty.cs_downgrade_threshold) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 830 | return cs; |
| 831 | |
| 832 | /* RF conditions are good, don't reduce */ |
Pau Espin Pedrol | e8dcf64 | 2021-01-14 13:17:01 +0100 | [diff] [blame] | 833 | if (ms->nack_rate_dl < the_pcu->vty.cs_adj_lower_limit) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 834 | return cs; |
| 835 | |
| 836 | /* The throughput would probably be better if the CS level was reduced */ |
| 837 | mcs_dec_kind(&cs, ms_mode(ms)); |
| 838 | |
| 839 | /* CS-2 doesn't gain throughput with small packets, further reduce to CS-1 */ |
| 840 | if (cs == CS2) |
| 841 | mcs_dec_kind(&cs, ms_mode(ms)); |
| 842 | |
| 843 | return cs; |
| 844 | } |
| 845 | |
| 846 | int ms_first_common_ts(const struct GprsMs *ms) |
| 847 | { |
| 848 | if (ms->dl_tbf) |
| 849 | return tbf_first_common_ts((struct gprs_rlcmac_tbf *)ms->dl_tbf); |
| 850 | |
| 851 | if (ms->ul_tbf) |
| 852 | return tbf_first_common_ts((struct gprs_rlcmac_tbf *)ms->ul_tbf); |
| 853 | |
| 854 | return -1; |
| 855 | } |
| 856 | |
| 857 | uint8_t ms_dl_slots(const struct GprsMs *ms) |
| 858 | { |
| 859 | uint8_t slots = 0; |
| 860 | |
| 861 | if (ms->dl_tbf) |
| 862 | slots |= tbf_dl_slots((struct gprs_rlcmac_tbf *)ms->dl_tbf); |
| 863 | |
| 864 | if (ms->ul_tbf) |
| 865 | slots |= tbf_dl_slots((struct gprs_rlcmac_tbf *)ms->ul_tbf); |
| 866 | |
| 867 | return slots; |
| 868 | } |
| 869 | |
| 870 | uint8_t ms_ul_slots(const struct GprsMs *ms) |
| 871 | { |
| 872 | uint8_t slots = 0; |
| 873 | |
| 874 | if (ms->dl_tbf) |
| 875 | slots |= tbf_ul_slots((struct gprs_rlcmac_tbf *)ms->dl_tbf); |
| 876 | |
| 877 | if (ms->ul_tbf) |
| 878 | slots |= tbf_ul_slots((struct gprs_rlcmac_tbf *)ms->ul_tbf); |
| 879 | |
| 880 | return slots; |
| 881 | } |
| 882 | |
| 883 | uint8_t ms_current_pacch_slots(const struct GprsMs *ms) |
| 884 | { |
| 885 | uint8_t slots = 0; |
| 886 | |
| 887 | bool is_dl_active = ms->dl_tbf && tbf_is_tfi_assigned((struct gprs_rlcmac_tbf *)ms->dl_tbf); |
| 888 | bool is_ul_active = ms->ul_tbf && tbf_is_tfi_assigned((struct gprs_rlcmac_tbf *)ms->ul_tbf); |
| 889 | |
| 890 | if (!is_dl_active && !is_ul_active) |
| 891 | return 0; |
| 892 | |
| 893 | /* see TS 44.060, 8.1.1.2.2 */ |
| 894 | if (is_dl_active && !is_ul_active) |
| 895 | slots = tbf_dl_slots((struct gprs_rlcmac_tbf *)ms->dl_tbf); |
| 896 | else if (!is_dl_active && is_ul_active) |
| 897 | slots = tbf_ul_slots((struct gprs_rlcmac_tbf *)ms->ul_tbf); |
| 898 | else |
| 899 | slots = tbf_ul_slots((struct gprs_rlcmac_tbf *)ms->ul_tbf) & |
| 900 | tbf_dl_slots((struct gprs_rlcmac_tbf *)ms->dl_tbf); |
| 901 | |
| 902 | /* Assume a multislot class 1 device */ |
| 903 | /* TODO: For class 2 devices, this could be removed */ |
| 904 | slots = pcu_lsb(slots); |
| 905 | |
| 906 | return slots; |
| 907 | } |
| 908 | |
| 909 | void ms_set_reserved_slots(struct GprsMs *ms, struct gprs_rlcmac_trx *trx, |
| 910 | uint8_t ul_slots, uint8_t dl_slots) |
| 911 | { |
| 912 | if (ms->current_trx) { |
| 913 | bts_trx_unreserve_slots(ms->current_trx, GPRS_RLCMAC_DL_TBF, |
| 914 | ms->reserved_dl_slots); |
| 915 | bts_trx_unreserve_slots(ms->current_trx, GPRS_RLCMAC_UL_TBF, |
| 916 | ms->reserved_ul_slots); |
| 917 | ms->reserved_dl_slots = 0; |
| 918 | ms->reserved_ul_slots = 0; |
| 919 | } |
| 920 | ms->current_trx = trx; |
| 921 | if (trx) { |
| 922 | ms->reserved_dl_slots = dl_slots; |
| 923 | ms->reserved_ul_slots = ul_slots; |
| 924 | bts_trx_reserve_slots(ms->current_trx, GPRS_RLCMAC_DL_TBF, |
| 925 | ms->reserved_dl_slots); |
| 926 | bts_trx_reserve_slots(ms->current_trx, GPRS_RLCMAC_UL_TBF, |
| 927 | ms->reserved_ul_slots); |
| 928 | } |
| 929 | } |
| 930 | |
| 931 | struct gprs_rlcmac_tbf *ms_tbf(const struct GprsMs *ms, enum gprs_rlcmac_tbf_direction dir) |
| 932 | { |
| 933 | switch (dir) { |
| 934 | case GPRS_RLCMAC_DL_TBF: return (struct gprs_rlcmac_tbf *)ms->dl_tbf; |
| 935 | case GPRS_RLCMAC_UL_TBF: return (struct gprs_rlcmac_tbf *)ms->ul_tbf; |
| 936 | } |
| 937 | |
| 938 | return NULL; |
| 939 | } |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 940 | |
| 941 | int ms_nacc_start(struct GprsMs *ms, Packet_Cell_Change_Notification_t *notif) |
| 942 | { |
| 943 | if (!ms->nacc) |
| 944 | ms->nacc = nacc_fsm_alloc(ms); |
| 945 | if (!ms->nacc) |
| 946 | return -EINVAL; |
| 947 | return osmo_fsm_inst_dispatch(ms->nacc->fi, NACC_EV_RX_CELL_CHG_NOTIFICATION, notif); |
| 948 | } |
| 949 | |
| 950 | bool ms_nacc_rts(const struct GprsMs *ms) |
| 951 | { |
| 952 | if (!ms->nacc) |
| 953 | return false; |
| 954 | if (ms->nacc->fi->state == NACC_ST_TX_NEIGHBOUR_DATA || |
| 955 | ms->nacc->fi->state == NACC_ST_TX_CELL_CHG_CONTINUE) |
| 956 | return true; |
| 957 | return false; |
| 958 | } |
| 959 | |
Pau Espin Pedrol | 952cb3d | 2021-02-01 14:52:48 +0100 | [diff] [blame] | 960 | struct msgb *ms_nacc_create_rlcmac_msg(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf, uint32_t fn, uint8_t ts) |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 961 | { |
| 962 | int rc; |
| 963 | struct nacc_ev_create_rlcmac_msg_ctx data_ctx; |
| 964 | |
Pau Espin Pedrol | 952cb3d | 2021-02-01 14:52:48 +0100 | [diff] [blame] | 965 | data_ctx = (struct nacc_ev_create_rlcmac_msg_ctx) { |
| 966 | .tbf = tbf, |
| 967 | .fn = fn, |
| 968 | .ts = ts, |
| 969 | .msg = NULL, |
| 970 | }; |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 971 | |
| 972 | rc = osmo_fsm_inst_dispatch(ms->nacc->fi, NACC_EV_CREATE_RLCMAC_MSG, &data_ctx); |
| 973 | if (rc != 0 || !data_ctx.msg) |
| 974 | return NULL; |
| 975 | return data_ctx.msg; |
| 976 | } |