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. |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 15 | */ |
| 16 | |
| 17 | |
| 18 | #include "gprs_ms.h" |
| 19 | #include "bts.h" |
| 20 | #include "tbf.h" |
| 21 | #include "tbf_ul.h" |
| 22 | #include "gprs_debug.h" |
| 23 | #include "gprs_codel.h" |
| 24 | #include "pcu_utils.h" |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 25 | #include "nacc_fsm.h" |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 26 | #include "tbf_ul_ack_fsm.h" |
Pau Espin Pedrol | 8abe13c | 2022-10-21 18:49:48 +0200 | [diff] [blame] | 27 | #include "gprs_ms_storage.h" |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 28 | |
| 29 | #include <time.h> |
| 30 | |
| 31 | #include <osmocom/core/talloc.h> |
| 32 | #include <osmocom/core/utils.h> |
| 33 | #include <osmocom/core/timer.h> |
| 34 | #include <osmocom/gsm/protocol/gsm_04_08.h> |
| 35 | #include <osmocom/gsm/gsm48.h> |
| 36 | #include <osmocom/core/logging.h> |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 37 | #include <osmocom/core/stats.h> |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 38 | #include "coding_scheme.h" |
| 39 | |
| 40 | #define GPRS_CODEL_SLOW_INTERVAL_MS 4000 |
| 41 | |
| 42 | extern void *tall_pcu_ctx; |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 43 | static unsigned int next_ms_ctr_group_id; |
| 44 | |
| 45 | static const struct rate_ctr_desc ms_ctr_description[] = { |
| 46 | [MS_CTR_DL_CTRL_MSG_SCHED] = { "ms:dl_ctrl_msg_sched", "Amount of DL CTRL messages scheduled" }, |
| 47 | }; |
| 48 | |
Pau Espin Pedrol | f5a251b | 2021-01-12 20:57:56 +0100 | [diff] [blame] | 49 | static const struct rate_ctr_group_desc ms_ctrg_desc = { |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 50 | .group_name_prefix = "pcu:ms", |
| 51 | .group_description = "MS Statistics", |
| 52 | .class_id = OSMO_STATS_CLASS_SUBSCRIBER, |
| 53 | .num_ctr = ARRAY_SIZE(ms_ctr_description), |
| 54 | .ctr_desc = ms_ctr_description, |
| 55 | }; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 56 | |
| 57 | static int64_t now_msec() |
| 58 | { |
| 59 | struct timespec ts; |
| 60 | osmo_clock_gettime(CLOCK_MONOTONIC, &ts); |
| 61 | |
| 62 | return (int64_t)(ts.tv_sec) * 1000 + ts.tv_nsec / 1000000; |
| 63 | } |
| 64 | |
| 65 | void gprs_default_cb_ms_idle(struct GprsMs *ms) |
| 66 | { |
| 67 | talloc_free(ms); |
| 68 | } |
| 69 | |
| 70 | void gprs_default_cb_ms_active(struct GprsMs *ms) |
| 71 | { |
| 72 | /* do nothing */ |
| 73 | } |
| 74 | |
| 75 | static struct gpr_ms_callback gprs_default_cb = { |
| 76 | .ms_idle = gprs_default_cb_ms_idle, |
| 77 | .ms_active = gprs_default_cb_ms_active, |
| 78 | }; |
| 79 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 80 | static void ms_release_timer_cb(void *data) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 81 | { |
| 82 | struct GprsMs *ms = (struct GprsMs *) data; |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 83 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Release timer expired\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 84 | |
| 85 | if (ms->timer.data) { |
| 86 | ms->timer.data = NULL; |
| 87 | ms_unref(ms); |
| 88 | } |
| 89 | } |
| 90 | |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 91 | static void ms_llc_timer_cb(void *_ms) |
| 92 | { |
| 93 | struct GprsMs *ms = _ms; |
| 94 | struct gprs_rlcmac_dl_tbf *dl_tbf = ms_dl_tbf(ms); |
| 95 | |
| 96 | if (!dl_tbf) |
| 97 | return; |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 98 | if (tbf_state(dl_tbf_as_tbf_const(dl_tbf)) != TBF_ST_FLOW) |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 99 | return; |
| 100 | |
Pau Espin Pedrol | bd1f01f | 2022-10-27 15:19:39 +0200 | [diff] [blame] | 101 | LOGPTBFDL(dl_tbf, LOGL_DEBUG, "LLC receive timeout, requesting DL ACK\n"); |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 102 | |
Pau Espin Pedrol | 8fa3e06 | 2022-10-28 17:38:52 +0200 | [diff] [blame] | 103 | dl_tbf_request_dl_ack(dl_tbf); |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 104 | } |
| 105 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 106 | static int ms_talloc_destructor(struct GprsMs *ms); |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 107 | 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] | 108 | { |
| 109 | struct GprsMs *ms = talloc_zero(tall_pcu_ctx, struct GprsMs); |
Pau Espin Pedrol | b498746 | 2022-04-01 17:21:08 +0200 | [diff] [blame] | 110 | OSMO_ASSERT(bts); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 111 | |
| 112 | talloc_set_destructor(ms, ms_talloc_destructor); |
| 113 | |
| 114 | ms->bts = bts; |
| 115 | ms->cb = gprs_default_cb; |
| 116 | ms->tlli = tlli; |
| 117 | ms->new_ul_tlli = GSM_RESERVED_TMSI; |
| 118 | ms->new_dl_tlli = GSM_RESERVED_TMSI; |
| 119 | ms->ta = GSM48_TA_INVALID; |
| 120 | ms->current_cs_ul = UNKNOWN; |
| 121 | ms->current_cs_dl = UNKNOWN; |
| 122 | ms->is_idle = true; |
| 123 | INIT_LLIST_HEAD(&ms->list); |
| 124 | INIT_LLIST_HEAD(&ms->old_tbfs); |
| 125 | |
| 126 | int codel_interval = LLC_CODEL_USE_DEFAULT; |
| 127 | |
| 128 | LOGP(DRLCMAC, LOGL_INFO, "Creating MS object, TLLI = 0x%08x\n", tlli); |
| 129 | |
| 130 | ms->imsi[0] = '\0'; |
Pau Espin Pedrol | c7802d9 | 2022-05-09 16:07:52 +0200 | [diff] [blame] | 131 | osmo_timer_setup(&ms->timer, ms_release_timer_cb, NULL); |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 132 | llc_queue_init(&ms->llc_queue, ms); |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 133 | memset(&ms->llc_timer, 0, sizeof(ms->llc_timer)); |
| 134 | osmo_timer_setup(&ms->llc_timer, ms_llc_timer_cb, ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 135 | |
| 136 | ms_set_mode(ms, GPRS); |
| 137 | |
Pau Espin Pedrol | b498746 | 2022-04-01 17:21:08 +0200 | [diff] [blame] | 138 | codel_interval = the_pcu->vty.llc_codel_interval_msec; |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 139 | if (codel_interval == LLC_CODEL_USE_DEFAULT) |
| 140 | codel_interval = GPRS_CODEL_SLOW_INTERVAL_MS; |
| 141 | llc_queue_set_codel_interval(&ms->llc_queue, codel_interval); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 142 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 143 | ms->last_cs_not_low = now_msec(); |
| 144 | ms->app_info_pending = false; |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 145 | |
| 146 | ms->ctrs = rate_ctr_group_alloc(ms, &ms_ctrg_desc, next_ms_ctr_group_id++); |
| 147 | if (!ms->ctrs) |
| 148 | goto free_ret; |
| 149 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 150 | return ms; |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 151 | free_ret: |
| 152 | talloc_free(ms); |
| 153 | return NULL; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | static int ms_talloc_destructor(struct GprsMs *ms) |
| 157 | { |
| 158 | struct llist_item *pos, *tmp; |
| 159 | |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 160 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Destroying MS object\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 161 | |
| 162 | ms_set_reserved_slots(ms, NULL, 0, 0); |
| 163 | |
Vadim Yanitskiy | e33c236 | 2022-07-22 03:44:44 +0700 | [diff] [blame] | 164 | osmo_timer_del(&ms->timer); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 165 | |
| 166 | if (ms->ul_tbf) { |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 167 | tbf_set_ms(ul_tbf_as_tbf(ms->ul_tbf), NULL); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 168 | ms->ul_tbf = NULL; |
| 169 | } |
| 170 | |
| 171 | if (ms->dl_tbf) { |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 172 | tbf_set_ms(dl_tbf_as_tbf(ms->dl_tbf), NULL); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 173 | ms->dl_tbf = NULL; |
| 174 | } |
| 175 | |
| 176 | llist_for_each_entry_safe(pos, tmp, &ms->old_tbfs, list) { |
| 177 | struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)pos->entry; |
| 178 | tbf_set_ms(tbf, NULL); |
| 179 | } |
| 180 | |
| 181 | llc_queue_clear(&ms->llc_queue, ms->bts); |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 182 | osmo_timer_del(&ms->llc_timer); |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 183 | |
| 184 | if (ms->ctrs) |
| 185 | rate_ctr_group_free(ms->ctrs); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | |
| 190 | void ms_set_callback(struct GprsMs *ms, struct gpr_ms_callback *cb) |
| 191 | { |
| 192 | if (cb) |
| 193 | ms->cb = *cb; |
| 194 | else |
| 195 | ms->cb = gprs_default_cb; |
| 196 | } |
| 197 | |
| 198 | static void ms_update_status(struct GprsMs *ms) |
| 199 | { |
| 200 | if (ms->ref > 0) |
| 201 | return; |
| 202 | |
| 203 | if (ms_is_idle(ms) && !ms->is_idle) { |
| 204 | ms->is_idle = true; |
| 205 | ms->cb.ms_idle(ms); |
| 206 | /* this can be deleted by now, do not access it */ |
| 207 | return; |
| 208 | } |
| 209 | |
| 210 | if (!ms_is_idle(ms) && ms->is_idle) { |
| 211 | ms->is_idle = false; |
| 212 | ms->cb.ms_active(ms); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | struct GprsMs *ms_ref(struct GprsMs *ms) |
| 217 | { |
| 218 | ms->ref += 1; |
| 219 | return ms; |
| 220 | } |
| 221 | |
| 222 | void ms_unref(struct GprsMs *ms) |
| 223 | { |
| 224 | OSMO_ASSERT(ms->ref >= 0); |
| 225 | ms->ref -= 1; |
| 226 | if (ms->ref == 0) |
| 227 | ms_update_status(ms); |
| 228 | } |
| 229 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 230 | static void ms_release_timer_start(struct GprsMs *ms) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 231 | { |
| 232 | if (ms->delay == 0) |
| 233 | return; |
| 234 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 235 | LOGPMS(ms, DRLCMAC, LOGL_DEBUG, "Schedule MS release in %u secs\n", ms->delay); |
| 236 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 237 | if (!ms->timer.data) |
| 238 | ms->timer.data = ms_ref(ms); |
| 239 | |
| 240 | osmo_timer_schedule(&ms->timer, ms->delay, 0); |
| 241 | } |
| 242 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 243 | static void ms_release_timer_stop(struct GprsMs *ms) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 244 | { |
| 245 | if (!ms->timer.data) |
| 246 | return; |
| 247 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 248 | LOGPMS(ms, DRLCMAC, LOGL_DEBUG, "Cancel scheduled MS release\n"); |
| 249 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 250 | osmo_timer_del(&ms->timer); |
| 251 | ms->timer.data = NULL; |
| 252 | ms_unref(ms); |
| 253 | } |
| 254 | |
| 255 | void ms_set_mode(struct GprsMs *ms, enum mcs_kind mode) |
| 256 | { |
| 257 | ms->mode = mode; |
| 258 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 259 | switch (ms->mode) { |
| 260 | case GPRS: |
| 261 | if (!mcs_is_gprs(ms->current_cs_ul)) { |
| 262 | ms->current_cs_ul = mcs_get_gprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 263 | ms->bts->initial_cs_ul); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 264 | if (!mcs_is_valid(ms->current_cs_ul)) |
| 265 | ms->current_cs_ul = CS1; |
| 266 | } |
| 267 | if (!mcs_is_gprs(ms->current_cs_dl)) { |
| 268 | ms->current_cs_dl = mcs_get_gprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 269 | ms->bts->initial_cs_dl); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 270 | if (!mcs_is_valid(ms->current_cs_dl)) |
| 271 | ms->current_cs_dl = CS1; |
| 272 | } |
| 273 | break; |
| 274 | |
| 275 | case EGPRS_GMSK: |
Pau Espin Pedrol | 7bb8cd6 | 2021-01-25 15:08:35 +0100 | [diff] [blame] | 276 | if (!mcs_is_edge_gmsk(ms->current_cs_ul)) { |
| 277 | ms->current_cs_ul = mcs_get_egprs_by_num( |
| 278 | ms->bts->initial_mcs_ul); |
| 279 | if (!mcs_is_valid(ms->current_cs_ul)) |
| 280 | ms->current_cs_ul = MCS1; |
| 281 | } |
| 282 | if (!mcs_is_edge_gmsk(ms->current_cs_dl)) { |
| 283 | ms->current_cs_dl = mcs_get_egprs_by_num( |
| 284 | ms->bts->initial_mcs_dl); |
| 285 | if (!mcs_is_valid(ms->current_cs_dl)) |
| 286 | ms->current_cs_dl = MCS1; |
| 287 | } |
| 288 | break; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 289 | case EGPRS: |
| 290 | if (!mcs_is_edge(ms->current_cs_ul)) { |
| 291 | ms->current_cs_ul = mcs_get_egprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 292 | ms->bts->initial_mcs_ul); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 293 | if (!mcs_is_valid(ms->current_cs_ul)) |
| 294 | ms->current_cs_ul = MCS1; |
| 295 | } |
| 296 | if (!mcs_is_edge(ms->current_cs_dl)) { |
| 297 | ms->current_cs_dl = mcs_get_egprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 298 | ms->bts->initial_mcs_dl); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 299 | if (!mcs_is_valid(ms->current_cs_dl)) |
| 300 | ms->current_cs_dl = MCS1; |
| 301 | } |
| 302 | break; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | static void ms_attach_ul_tbf(struct GprsMs *ms, struct gprs_rlcmac_ul_tbf *tbf) |
| 307 | { |
| 308 | if (ms->ul_tbf == tbf) |
| 309 | return; |
| 310 | |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 311 | 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] | 312 | |
| 313 | ms_ref(ms); |
| 314 | |
| 315 | if (ms->ul_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 316 | llist_add_tail(tbf_ms_list(ul_tbf_as_tbf(ms->ul_tbf)), &ms->old_tbfs); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 317 | |
| 318 | ms->ul_tbf = tbf; |
| 319 | |
| 320 | if (tbf) |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 321 | ms_release_timer_stop(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 322 | |
| 323 | ms_unref(ms); |
| 324 | } |
| 325 | |
| 326 | static void ms_attach_dl_tbf(struct GprsMs *ms, struct gprs_rlcmac_dl_tbf *tbf) |
| 327 | { |
| 328 | if (ms->dl_tbf == tbf) |
| 329 | return; |
| 330 | |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 331 | 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] | 332 | |
| 333 | ms_ref(ms); |
| 334 | |
| 335 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 336 | llist_add_tail(tbf_ms_list(dl_tbf_as_tbf(ms->dl_tbf)), &ms->old_tbfs); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 337 | |
| 338 | ms->dl_tbf = tbf; |
| 339 | |
| 340 | if (tbf) |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 341 | ms_release_timer_stop(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 342 | |
| 343 | ms_unref(ms); |
| 344 | } |
| 345 | |
| 346 | void ms_attach_tbf(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf) |
| 347 | { |
Pau Espin Pedrol | b5fece9 | 2021-08-23 16:58:04 +0200 | [diff] [blame] | 348 | if (tbf_direction(tbf) == GPRS_RLCMAC_DL_TBF) |
Pau Espin Pedrol | cc30b05 | 2022-10-27 15:25:55 +0200 | [diff] [blame] | 349 | ms_attach_dl_tbf(ms, tbf_as_dl_tbf(tbf)); |
Pau Espin Pedrol | b5fece9 | 2021-08-23 16:58:04 +0200 | [diff] [blame] | 350 | else |
Pau Espin Pedrol | cc30b05 | 2022-10-27 15:25:55 +0200 | [diff] [blame] | 351 | ms_attach_ul_tbf(ms, tbf_as_ul_tbf(tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 352 | } |
| 353 | |
| 354 | void ms_detach_tbf(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf) |
| 355 | { |
| 356 | if (tbf == (struct gprs_rlcmac_tbf *)(ms->ul_tbf)) { |
| 357 | ms->ul_tbf = NULL; |
| 358 | } else if (tbf == (struct gprs_rlcmac_tbf *)(ms->dl_tbf)) { |
| 359 | ms->dl_tbf = NULL; |
| 360 | } else { |
| 361 | bool found = false; |
| 362 | |
| 363 | struct llist_item *pos, *tmp; |
| 364 | llist_for_each_entry_safe(pos, tmp, &ms->old_tbfs, list) { |
| 365 | struct gprs_rlcmac_tbf *tmp_tbf = (struct gprs_rlcmac_tbf *)pos->entry; |
| 366 | if (tmp_tbf == tbf) { |
| 367 | llist_del(&pos->list); |
| 368 | found = true; |
| 369 | break; |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | /* Protect against recursive calls via set_ms() */ |
| 374 | if (!found) |
| 375 | return; |
| 376 | } |
| 377 | |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 378 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Detaching TBF: %s\n", |
| 379 | tbf_name(tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 380 | |
| 381 | if (tbf_ms(tbf) == ms) |
| 382 | tbf_set_ms(tbf, NULL); |
| 383 | |
| 384 | if (!ms->dl_tbf && !ms->ul_tbf) { |
| 385 | ms_set_reserved_slots(ms, NULL, 0, 0); |
| 386 | |
| 387 | if (ms_tlli(ms) != 0) |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 388 | ms_release_timer_start(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | ms_update_status(ms); |
| 392 | } |
| 393 | |
| 394 | void ms_reset(struct GprsMs *ms) |
| 395 | { |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 396 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Clearing MS object\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 397 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 398 | ms_release_timer_stop(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 399 | |
| 400 | ms->tlli = GSM_RESERVED_TMSI; |
| 401 | ms->new_dl_tlli = ms->tlli; |
| 402 | ms->new_ul_tlli = ms->tlli; |
| 403 | ms->imsi[0] = '\0'; |
| 404 | } |
| 405 | |
Pau Espin Pedrol | 8abe13c | 2022-10-21 18:49:48 +0200 | [diff] [blame] | 406 | /* This function should be called on the MS object of a TBF each time an RLCMAC |
| 407 | * block is received for it with TLLI information. |
| 408 | * Besides updating the TLLI field on the MS object, it also seeks for other MS |
| 409 | * objects in the store and merges them into the current MS object. The MS |
| 410 | * duplication happened because we don't learn the TLLI of the created TBF until |
| 411 | * a later point. */ |
| 412 | void ms_update_announced_tlli(struct GprsMs *ms, uint32_t tlli) |
| 413 | { |
| 414 | struct GprsMs *old_ms = NULL; |
| 415 | |
| 416 | if (tlli == GSM_RESERVED_TMSI) |
| 417 | return; |
| 418 | |
| 419 | /* When the TLLI does not match the ms, check if there is another |
| 420 | * MS object that belongs to that TLLI and if yes make sure one of them |
| 421 | * gets deleted. */ |
| 422 | if (!ms_check_tlli(ms, tlli)) |
| 423 | old_ms = ms_store_get_ms(bts_ms_store(ms->bts), tlli, GSM_RESERVED_TMSI, NULL); |
| 424 | |
| 425 | ms_set_tlli(ms, tlli); |
| 426 | |
| 427 | if (old_ms) |
| 428 | ms_merge_and_clear_ms(ms, old_ms); |
| 429 | /* old_ms may no longer be available here */ |
| 430 | } |
| 431 | |
Pau Espin Pedrol | 32416fd | 2022-10-31 12:55:03 +0100 | [diff] [blame] | 432 | /* Merge 'old_ms' object into 'ms' object. |
| 433 | * 'old_ms' may be freed during the call to this function, don't use the pointer to it afterwards */ |
| 434 | void ms_merge_and_clear_ms(struct GprsMs *ms, struct GprsMs *old_ms) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 435 | { |
Pau Espin Pedrol | 32416fd | 2022-10-31 12:55:03 +0100 | [diff] [blame] | 436 | char old_ms_name[128]; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 437 | OSMO_ASSERT(old_ms != ms); |
Pau Espin Pedrol | 32416fd | 2022-10-31 12:55:03 +0100 | [diff] [blame] | 438 | ms_ref(old_ms); |
| 439 | |
| 440 | ms_name_buf(old_ms, old_ms_name, sizeof(old_ms_name)); |
| 441 | |
| 442 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Merge MS: %s\n", old_ms_name); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 443 | |
| 444 | if (strlen(ms_imsi(ms)) == 0 && strlen(ms_imsi(old_ms)) != 0) |
| 445 | osmo_strlcpy(ms->imsi, ms_imsi(old_ms), sizeof(ms->imsi)); |
| 446 | |
| 447 | if (!ms_ms_class(ms) && ms_ms_class(old_ms)) |
| 448 | ms_set_ms_class(ms, ms_ms_class(old_ms)); |
| 449 | |
| 450 | if (!ms_egprs_ms_class(ms) && ms_egprs_ms_class(old_ms)) |
| 451 | ms_set_egprs_ms_class(ms, ms_egprs_ms_class(old_ms)); |
| 452 | |
| 453 | llc_queue_move_and_merge(&ms->llc_queue, &old_ms->llc_queue); |
| 454 | |
Pau Espin Pedrol | 677bebb | 2022-10-31 13:56:33 +0100 | [diff] [blame] | 455 | if (!ms_dl_tbf(ms) && ms_dl_tbf(old_ms)) { |
| 456 | struct gprs_rlcmac_dl_tbf *dl_tbf = ms_dl_tbf(old_ms); |
| 457 | LOGPTBFDL(dl_tbf, LOGL_NOTICE, |
| 458 | "Merge MS: Move DL TBF: %s => %s\n", |
| 459 | old_ms_name, ms_name(ms)); |
| 460 | /* Move the DL TBF to the new MS */ |
| 461 | tbf_set_ms(dl_tbf_as_tbf(dl_tbf), ms); |
| 462 | } |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 463 | |
| 464 | /* Clean up the old MS object */ |
| 465 | /* TODO: Use timer? */ |
| 466 | if (ms_ul_tbf(old_ms) && !tbf_timers_pending((struct gprs_rlcmac_tbf *)ms_ul_tbf(old_ms), T_MAX)) |
| 467 | tbf_free((struct gprs_rlcmac_tbf *)ms_ul_tbf(old_ms)); |
| 468 | if (ms_dl_tbf(old_ms) && !tbf_timers_pending((struct gprs_rlcmac_tbf *)ms_dl_tbf(old_ms), T_MAX)) |
| 469 | tbf_free((struct gprs_rlcmac_tbf *)ms_dl_tbf(old_ms)); |
| 470 | |
Pau Espin Pedrol | 32416fd | 2022-10-31 12:55:03 +0100 | [diff] [blame] | 471 | ms_reset(old_ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 472 | |
| 473 | ms_unref(old_ms); |
| 474 | } |
| 475 | |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 476 | /* Apply changes to the TLLI directly, used interally by functions below: */ |
| 477 | static void ms_apply_tlli_change(struct GprsMs *ms, uint32_t tlli) |
| 478 | { |
| 479 | ms->tlli = tlli; |
| 480 | ms->new_dl_tlli = GSM_RESERVED_TMSI; |
| 481 | ms->new_ul_tlli = GSM_RESERVED_TMSI; |
| 482 | |
| 483 | /* Update TBF FSM names: */ |
| 484 | if (ms->ul_tbf) |
| 485 | tbf_update_state_fsm_name(ul_tbf_as_tbf(ms->ul_tbf)); |
| 486 | if (ms->dl_tbf) |
| 487 | tbf_update_state_fsm_name(dl_tbf_as_tbf(ms->dl_tbf)); |
| 488 | } |
| 489 | |
Pau Espin Pedrol | 0b5997e | 2022-10-21 14:10:41 +0200 | [diff] [blame] | 490 | /* Set/update the MS object TLLI based on knowledge gained from the MS side (Uplink direction) */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 491 | void ms_set_tlli(struct GprsMs *ms, uint32_t tlli) |
| 492 | { |
| 493 | if (tlli == ms->tlli || tlli == ms->new_ul_tlli) |
| 494 | return; |
| 495 | |
| 496 | if (tlli != ms->new_dl_tlli) { |
| 497 | LOGP(DRLCMAC, LOGL_INFO, |
| 498 | "Modifying MS object, UL TLLI: 0x%08x -> 0x%08x, " |
| 499 | "not yet confirmed\n", |
| 500 | ms_tlli(ms), tlli); |
| 501 | ms->new_ul_tlli = tlli; |
| 502 | return; |
| 503 | } |
| 504 | |
| 505 | LOGP(DRLCMAC, LOGL_INFO, |
| 506 | "Modifying MS object, TLLI: 0x%08x -> 0x%08x, " |
| 507 | "already confirmed partly\n", |
| 508 | ms->tlli, tlli); |
| 509 | |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 510 | ms_apply_tlli_change(ms, tlli); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 511 | } |
| 512 | |
Pau Espin Pedrol | 0b5997e | 2022-10-21 14:10:41 +0200 | [diff] [blame] | 513 | /* Set/update the MS object TLLI based on knowledge gained from the SGSN side (Downlink direction) */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 514 | bool ms_confirm_tlli(struct GprsMs *ms, uint32_t tlli) |
| 515 | { |
| 516 | if (tlli == ms->tlli || tlli == ms->new_dl_tlli) |
| 517 | return false; |
| 518 | |
| 519 | if (tlli != ms->new_ul_tlli) { |
| 520 | /* The MS has not sent a message with the new TLLI, which may |
| 521 | * happen according to the spec [TODO: add reference]. */ |
| 522 | |
| 523 | LOGP(DRLCMAC, LOGL_INFO, |
| 524 | "The MS object cannot fully confirm an unexpected TLLI: 0x%08x, " |
| 525 | "partly confirmed\n", tlli); |
| 526 | /* Use the network's idea of TLLI as candidate, this does not |
| 527 | * change the result value of tlli() */ |
| 528 | ms->new_dl_tlli = tlli; |
| 529 | return false; |
| 530 | } |
| 531 | |
| 532 | LOGP(DRLCMAC, LOGL_INFO, |
| 533 | "Modifying MS object, TLLI: 0x%08x confirmed\n", tlli); |
| 534 | |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 535 | ms_apply_tlli_change(ms, tlli); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 536 | |
| 537 | return true; |
| 538 | } |
| 539 | |
| 540 | void ms_set_imsi(struct GprsMs *ms, const char *imsi) |
| 541 | { |
| 542 | if (!imsi) { |
| 543 | LOGP(DRLCMAC, LOGL_ERROR, "Expected IMSI!\n"); |
| 544 | return; |
| 545 | } |
| 546 | |
| 547 | if (imsi[0] && strlen(imsi) < 3) { |
| 548 | LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI '%s'!\n", |
| 549 | imsi); |
| 550 | return; |
| 551 | } |
| 552 | |
| 553 | if (strcmp(imsi, ms->imsi) == 0) |
| 554 | return; |
| 555 | |
| 556 | LOGP(DRLCMAC, LOGL_INFO, |
| 557 | "Modifying MS object, TLLI = 0x%08x, IMSI '%s' -> '%s'\n", |
| 558 | ms_tlli(ms), ms->imsi, imsi); |
| 559 | |
| 560 | struct GprsMs *old_ms = bts_ms_by_imsi(ms->bts, imsi); |
| 561 | /* Check if we are going to store a different MS object with already |
| 562 | existing IMSI. This is probably a bug in code calling this function, |
| 563 | since it should take care of this explicitly */ |
| 564 | if (old_ms) { |
| 565 | /* We cannot find ms->ms by IMSI since we know that it has a |
| 566 | * different IMSI */ |
| 567 | OSMO_ASSERT(old_ms != ms); |
| 568 | |
| 569 | LOGPMS(ms, DRLCMAC, LOGL_NOTICE, |
| 570 | "IMSI '%s' was already assigned to another " |
| 571 | "MS object: TLLI = 0x%08x, that IMSI will be removed\n", |
| 572 | imsi, ms_tlli(old_ms)); |
| 573 | |
| 574 | ms_merge_and_clear_ms(ms, old_ms); |
Pau Espin Pedrol | b8ff74b | 2022-10-31 12:58:46 +0100 | [diff] [blame] | 575 | /* old_ms may no longer be available here */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 576 | } |
| 577 | |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 578 | /* Store the new IMSI: */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 579 | osmo_strlcpy(ms->imsi, imsi, sizeof(ms->imsi)); |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 580 | |
| 581 | /* Update TBF FSM names: */ |
| 582 | if (ms->ul_tbf) |
| 583 | tbf_update_state_fsm_name(ul_tbf_as_tbf(ms->ul_tbf)); |
| 584 | if (ms->dl_tbf) |
| 585 | tbf_update_state_fsm_name(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 586 | } |
| 587 | |
Pau Espin Pedrol | 5deac14 | 2021-11-12 18:01:50 +0100 | [diff] [blame] | 588 | uint16_t ms_paging_group(struct GprsMs *ms) |
| 589 | { |
| 590 | uint16_t pgroup; |
| 591 | if (!ms_imsi_is_valid(ms)) |
| 592 | return 0; /* 000 is the special "all paging" group */ |
| 593 | if ((pgroup = imsi2paging_group(ms_imsi(ms))) > 999) { |
| 594 | LOGPMS(ms, DRLCMAC, LOGL_ERROR, "IMSI to paging group failed!\n"); |
| 595 | return 0; |
| 596 | } |
| 597 | return pgroup; |
| 598 | } |
| 599 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 600 | void ms_set_ta(struct GprsMs *ms, uint8_t ta_) |
| 601 | { |
| 602 | if (ta_ == ms->ta) |
| 603 | return; |
| 604 | |
| 605 | if (gsm48_ta_is_valid(ta_)) { |
| 606 | LOGP(DRLCMAC, LOGL_INFO, |
| 607 | "Modifying MS object, TLLI = 0x%08x, TA %d -> %d\n", |
| 608 | ms_tlli(ms), ms->ta, ta_); |
| 609 | ms->ta = ta_; |
| 610 | } else |
| 611 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 612 | "MS object, TLLI = 0x%08x, invalid TA %d rejected (old " |
| 613 | "value %d kept)\n", ms_tlli(ms), ta_, ms->ta); |
| 614 | } |
| 615 | |
| 616 | void ms_set_ms_class(struct GprsMs *ms, uint8_t ms_class_) |
| 617 | { |
| 618 | if (ms_class_ == ms->ms_class) |
| 619 | return; |
| 620 | |
| 621 | LOGP(DRLCMAC, LOGL_INFO, |
| 622 | "Modifying MS object, TLLI = 0x%08x, MS class %d -> %d\n", |
| 623 | ms_tlli(ms), ms->ms_class, ms_class_); |
| 624 | |
| 625 | ms->ms_class = ms_class_; |
| 626 | } |
| 627 | |
| 628 | void ms_set_egprs_ms_class(struct GprsMs *ms, uint8_t ms_class_) |
| 629 | { |
| 630 | if (ms_class_ == ms->egprs_ms_class) |
| 631 | return; |
| 632 | |
| 633 | LOGP(DRLCMAC, LOGL_INFO, |
| 634 | "Modifying MS object, TLLI = 0x%08x, EGPRS MS class %d -> %d\n", |
| 635 | ms_tlli(ms), ms->egprs_ms_class, ms_class_); |
| 636 | |
| 637 | ms->egprs_ms_class = ms_class_; |
| 638 | |
| 639 | if (!bts_max_mcs_ul(ms->bts) || !bts_max_mcs_dl(ms->bts)) { |
| 640 | LOGPMS(ms, DRLCMAC, LOGL_DEBUG, |
| 641 | "Avoid enabling EGPRS because use of MCS is disabled: ul=%u dl=%u\n", |
| 642 | bts_max_mcs_ul(ms->bts), bts_max_mcs_dl(ms->bts)); |
| 643 | return; |
| 644 | } |
| 645 | |
| 646 | if (mcs_is_edge_gmsk(mcs_get_egprs_by_num(bts_max_mcs_ul(ms->bts))) && |
| 647 | mcs_is_edge_gmsk(mcs_get_egprs_by_num(bts_max_mcs_dl(ms->bts))) && |
| 648 | ms_mode(ms) != EGPRS) |
| 649 | { |
| 650 | ms_set_mode(ms, EGPRS_GMSK); |
| 651 | } else { |
| 652 | ms_set_mode(ms, EGPRS); |
| 653 | } |
| 654 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Enabled EGPRS, mode %s\n", mode_name(ms_mode(ms))); |
| 655 | } |
| 656 | |
| 657 | void ms_update_error_rate(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf, int error_rate) |
| 658 | { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 659 | int64_t now; |
| 660 | enum CodingScheme max_cs_dl = ms_max_cs_dl(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 661 | OSMO_ASSERT(max_cs_dl); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 662 | |
| 663 | if (error_rate < 0) |
| 664 | return; |
| 665 | |
| 666 | now = now_msec(); |
| 667 | |
| 668 | /* TODO: Check for TBF direction */ |
| 669 | /* TODO: Support different CS values for UL and DL */ |
| 670 | |
| 671 | ms->nack_rate_dl = error_rate; |
| 672 | |
Pau Espin Pedrol | e8dcf64 | 2021-01-14 13:17:01 +0100 | [diff] [blame] | 673 | if (error_rate > the_pcu->vty.cs_adj_upper_limit) { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 674 | if (mcs_chan_code(ms->current_cs_dl) > 0) { |
| 675 | mcs_dec_kind(&ms->current_cs_dl, ms_mode(ms)); |
| 676 | LOGP(DRLCMACDL, LOGL_INFO, |
| 677 | "MS (IMSI %s): High error rate %d%%, " |
| 678 | "reducing CS level to %s\n", |
| 679 | ms_imsi(ms), error_rate, mcs_name(ms->current_cs_dl)); |
| 680 | ms->last_cs_not_low = now; |
| 681 | } |
Pau Espin Pedrol | e8dcf64 | 2021-01-14 13:17:01 +0100 | [diff] [blame] | 682 | } else if (error_rate < the_pcu->vty.cs_adj_lower_limit) { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 683 | if (ms->current_cs_dl < max_cs_dl) { |
| 684 | if (now - ms->last_cs_not_low > 1000) { |
| 685 | mcs_inc_kind(&ms->current_cs_dl, ms_mode(ms)); |
| 686 | |
| 687 | LOGP(DRLCMACDL, LOGL_INFO, |
| 688 | "MS (IMSI %s): Low error rate %d%%, " |
| 689 | "increasing DL CS level to %s\n", |
| 690 | ms_imsi(ms), error_rate, |
| 691 | mcs_name(ms->current_cs_dl)); |
| 692 | ms->last_cs_not_low = now; |
| 693 | } else { |
| 694 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 695 | "MS (IMSI %s): Low error rate %d%%, " |
| 696 | "ignored (within blocking period)\n", |
| 697 | ms_imsi(ms), error_rate); |
| 698 | } |
| 699 | } |
| 700 | } else { |
| 701 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 702 | "MS (IMSI %s): Medium error rate %d%%, ignored\n", |
| 703 | ms_imsi(ms), error_rate); |
| 704 | ms->last_cs_not_low = now; |
| 705 | } |
| 706 | } |
| 707 | |
| 708 | enum CodingScheme ms_max_cs_ul(const struct GprsMs *ms) |
| 709 | { |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 710 | enum CodingScheme cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 711 | OSMO_ASSERT(ms->bts != NULL); |
| 712 | |
| 713 | if (mcs_is_gprs(ms->current_cs_ul)) { |
| 714 | if (!bts_max_cs_ul(ms->bts)) { |
| 715 | return CS4; |
| 716 | } |
| 717 | |
| 718 | return mcs_get_gprs_by_num(bts_max_cs_ul(ms->bts)); |
| 719 | } |
| 720 | |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 721 | cs = mcs_get_egprs_by_num(bts_max_mcs_ul(ms->bts)); |
| 722 | if (ms_mode(ms) == EGPRS_GMSK && cs > MCS4) |
| 723 | cs = MCS4; |
| 724 | return cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 725 | } |
| 726 | |
| 727 | void ms_set_current_cs_dl(struct GprsMs *ms, enum CodingScheme scheme) |
| 728 | { |
| 729 | ms->current_cs_dl = scheme; |
| 730 | } |
| 731 | |
| 732 | enum CodingScheme ms_max_cs_dl(const struct GprsMs *ms) |
| 733 | { |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 734 | enum CodingScheme cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 735 | OSMO_ASSERT(ms->bts != NULL); |
| 736 | |
| 737 | if (mcs_is_gprs(ms->current_cs_dl)) { |
| 738 | if (!bts_max_cs_dl(ms->bts)) { |
| 739 | return CS4; |
| 740 | } |
| 741 | |
| 742 | return mcs_get_gprs_by_num(bts_max_cs_dl(ms->bts)); |
| 743 | } |
| 744 | |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 745 | cs = mcs_get_egprs_by_num(bts_max_mcs_dl(ms->bts)); |
| 746 | if (ms_mode(ms) == EGPRS_GMSK && cs > MCS4) |
| 747 | cs = MCS4; |
| 748 | return cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 749 | } |
| 750 | |
| 751 | void ms_update_cs_ul(struct GprsMs *ms, const struct pcu_l1_meas *meas) |
| 752 | { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 753 | enum CodingScheme max_cs_ul = ms_max_cs_ul(ms); |
| 754 | |
| 755 | int old_link_qual; |
| 756 | int low; |
| 757 | int high; |
| 758 | enum CodingScheme new_cs_ul = ms->current_cs_ul; |
| 759 | uint8_t current_cs = mcs_chan_code(ms->current_cs_ul); |
| 760 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 761 | if (!max_cs_ul) { |
| 762 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 763 | "max_cs_ul cannot be derived (current UL CS: %s)\n", |
| 764 | mcs_name(ms->current_cs_ul)); |
| 765 | return; |
| 766 | } |
| 767 | |
| 768 | if (!ms->current_cs_ul) { |
| 769 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 770 | "Unable to update UL (M)CS because it's not set: %s\n", |
| 771 | mcs_name(ms->current_cs_ul)); |
| 772 | return; |
| 773 | } |
| 774 | |
| 775 | if (!meas->have_link_qual) { |
| 776 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 777 | "Unable to update UL (M)CS %s because we don't have link quality measurements.\n", |
| 778 | mcs_name(ms->current_cs_ul)); |
| 779 | return; |
| 780 | } |
| 781 | |
| 782 | if (mcs_is_gprs(ms->current_cs_ul)) { |
| 783 | if (current_cs >= MAX_GPRS_CS) |
| 784 | current_cs = MAX_GPRS_CS - 1; |
Pau Espin Pedrol | 54b159a | 2021-01-14 13:30:04 +0100 | [diff] [blame] | 785 | low = the_pcu->vty.cs_lqual_ranges[current_cs].low; |
| 786 | high = the_pcu->vty.cs_lqual_ranges[current_cs].high; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 787 | } else if (mcs_is_edge(ms->current_cs_ul)) { |
| 788 | if (current_cs >= MAX_EDGE_MCS) |
| 789 | current_cs = MAX_EDGE_MCS - 1; |
Pau Espin Pedrol | 54b159a | 2021-01-14 13:30:04 +0100 | [diff] [blame] | 790 | low = the_pcu->vty.mcs_lqual_ranges[current_cs].low; |
| 791 | high = the_pcu->vty.mcs_lqual_ranges[current_cs].high; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 792 | } else { |
| 793 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 794 | "Unable to update UL (M)CS because it's neither GPRS nor EDGE: %s\n", |
| 795 | mcs_name(ms->current_cs_ul)); |
| 796 | return; |
| 797 | } |
| 798 | |
| 799 | /* To avoid rapid changes of the coding scheme, we also take |
| 800 | * the old link quality value into account (if present). */ |
| 801 | if (ms->l1_meas.have_link_qual) |
| 802 | old_link_qual = ms->l1_meas.link_qual; |
| 803 | else |
| 804 | old_link_qual = meas->link_qual; |
| 805 | |
| 806 | if (meas->link_qual < low && old_link_qual < low) |
| 807 | mcs_dec_kind(&new_cs_ul, ms_mode(ms)); |
| 808 | else if (meas->link_qual > high && old_link_qual > high && |
| 809 | ms->current_cs_ul < max_cs_ul) |
| 810 | mcs_inc_kind(&new_cs_ul, ms_mode(ms)); |
| 811 | |
| 812 | if (ms->current_cs_ul != new_cs_ul) { |
| 813 | LOGPMS(ms, DRLCMACMEAS, LOGL_INFO, |
| 814 | "Link quality %ddB (old %ddB) left window [%d, %d], " |
| 815 | "modifying uplink CS level: %s -> %s\n", |
| 816 | meas->link_qual, old_link_qual, |
| 817 | low, high, |
| 818 | mcs_name(ms->current_cs_ul), mcs_name(new_cs_ul)); |
| 819 | |
| 820 | ms->current_cs_ul = new_cs_ul; |
| 821 | } |
| 822 | } |
| 823 | |
| 824 | void ms_update_l1_meas(struct GprsMs *ms, const struct pcu_l1_meas *meas) |
| 825 | { |
| 826 | unsigned i; |
| 827 | |
| 828 | ms_update_cs_ul(ms, meas); |
| 829 | |
| 830 | if (meas->have_rssi) |
| 831 | pcu_l1_meas_set_rssi(&ms->l1_meas, meas->rssi); |
| 832 | if (meas->have_bto) |
| 833 | pcu_l1_meas_set_bto(&ms->l1_meas, meas->bto); |
| 834 | if (meas->have_ber) |
| 835 | pcu_l1_meas_set_ber(&ms->l1_meas, meas->ber); |
| 836 | if (meas->have_link_qual) |
| 837 | pcu_l1_meas_set_link_qual(&ms->l1_meas, meas->link_qual); |
| 838 | |
| 839 | if (meas->have_ms_rx_qual) |
| 840 | pcu_l1_meas_set_ms_rx_qual(&ms->l1_meas, meas->ms_rx_qual); |
| 841 | if (meas->have_ms_c_value) |
| 842 | pcu_l1_meas_set_ms_c_value(&ms->l1_meas, meas->ms_c_value); |
| 843 | if (meas->have_ms_sign_var) |
| 844 | pcu_l1_meas_set_ms_sign_var(&ms->l1_meas, meas->ms_sign_var); |
| 845 | |
| 846 | if (meas->have_ms_i_level) { |
| 847 | for (i = 0; i < ARRAY_SIZE(meas->ts); ++i) { |
| 848 | if (meas->ts[i].have_ms_i_level) |
| 849 | pcu_l1_meas_set_ms_i_level(&ms->l1_meas, i, meas->ts[i].ms_i_level); |
| 850 | else |
| 851 | ms->l1_meas.ts[i].have_ms_i_level = 0; |
| 852 | } |
| 853 | } |
| 854 | } |
| 855 | |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 856 | /* req_mcs_kind acts as a set filter, where EGPRS means any and GPRS is the most restrictive */ |
| 857 | 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] | 858 | { |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 859 | enum CodingScheme orig_cs = ms->current_cs_dl; |
| 860 | struct gprs_rlcmac_bts *bts = ms->bts; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 861 | size_t unencoded_octets; |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 862 | enum CodingScheme cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 863 | |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 864 | /* It could be that a TBF requests a GPRS CS despite the MS currently |
| 865 | being upgraded to EGPRS (hence reporting MCS). That could happen |
| 866 | because the TBF was created early in the process where we didn't have |
| 867 | yet enough information about the MS, and only AFTER it was created we |
| 868 | upgraded the MS to be EGPRS capable. |
| 869 | As a result, when the MS is queried for the target CS here, we could be |
| 870 | returning an MCS despite the current TBF being established as GPRS, |
| 871 | but we rather stick to the TBF type we assigned to the MS rather than |
| 872 | magically sending EGPRS data blocks to a GPRS TBF. |
| 873 | It could also be that the caller requests specific MCS kind |
| 874 | explicitly too due to scheduling restrictions (GPRS+EGPRS multiplexing). */ |
| 875 | if (req_mcs_kind == EGPRS_GMSK && mcs_is_edge(orig_cs) && orig_cs > MCS4) { |
| 876 | cs = bts_cs_dl_is_supported(bts, MCS4) ? MCS4 : |
| 877 | bts_cs_dl_is_supported(bts, MCS3) ? MCS3 : |
| 878 | bts_cs_dl_is_supported(bts, MCS2) ? MCS2 : |
| 879 | MCS1; |
| 880 | } else if (req_mcs_kind == GPRS && mcs_is_edge(orig_cs)) { /* GPRS */ |
| 881 | int i; |
| 882 | cs = orig_cs > MCS4 ? MCS4 : orig_cs; |
| 883 | cs -= (MCS1 - CS1); /* MCSx -> CSx */ |
| 884 | /* Find suitable CS starting from equivalent MCS which is supported by BTS: */ |
| 885 | for (i = mcs_chan_code(cs); !bts_cs_dl_is_supported(bts, CS1 + i); i--); |
| 886 | OSMO_ASSERT(i >= 0 && i <= 3); /* CS1 is always supported */ |
| 887 | cs = CS1 + i; |
| 888 | } else { |
| 889 | cs = orig_cs; |
| 890 | } |
| 891 | |
| 892 | if (orig_cs != cs) |
| 893 | LOGPMS(ms, DRLCMACDL, LOGL_INFO, "MS (mode=%s) suggests transmitting " |
| 894 | "DL %s, downgrade to %s in order to match TBF & scheduler requirements\n", |
| 895 | 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] | 896 | |
| 897 | unencoded_octets = llc_queue_octets(&ms->llc_queue); |
| 898 | |
| 899 | /* If the DL TBF is active, add number of unencoded chunk octets */ |
| 900 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 901 | unencoded_octets += llc_chunk_size(tbf_llc(dl_tbf_as_tbf(ms->dl_tbf))); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 902 | |
| 903 | /* There are many unencoded octets, don't reduce */ |
Pau Espin Pedrol | ad79b85 | 2021-01-14 13:20:55 +0100 | [diff] [blame] | 904 | if (unencoded_octets >= the_pcu->vty.cs_downgrade_threshold) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 905 | return cs; |
| 906 | |
| 907 | /* RF conditions are good, don't reduce */ |
Pau Espin Pedrol | e8dcf64 | 2021-01-14 13:17:01 +0100 | [diff] [blame] | 908 | 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] | 909 | return cs; |
| 910 | |
| 911 | /* The throughput would probably be better if the CS level was reduced */ |
| 912 | mcs_dec_kind(&cs, ms_mode(ms)); |
| 913 | |
| 914 | /* CS-2 doesn't gain throughput with small packets, further reduce to CS-1 */ |
| 915 | if (cs == CS2) |
| 916 | mcs_dec_kind(&cs, ms_mode(ms)); |
| 917 | |
| 918 | return cs; |
| 919 | } |
| 920 | |
| 921 | int ms_first_common_ts(const struct GprsMs *ms) |
| 922 | { |
| 923 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 924 | return tbf_first_common_ts(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 925 | |
| 926 | if (ms->ul_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 927 | return tbf_first_common_ts(ul_tbf_as_tbf(ms->ul_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 928 | |
| 929 | return -1; |
| 930 | } |
| 931 | |
| 932 | uint8_t ms_dl_slots(const struct GprsMs *ms) |
| 933 | { |
| 934 | uint8_t slots = 0; |
| 935 | |
| 936 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 937 | slots |= tbf_dl_slots(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 938 | |
| 939 | if (ms->ul_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 940 | slots |= tbf_dl_slots(ul_tbf_as_tbf(ms->ul_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 941 | |
| 942 | return slots; |
| 943 | } |
| 944 | |
| 945 | uint8_t ms_ul_slots(const struct GprsMs *ms) |
| 946 | { |
| 947 | uint8_t slots = 0; |
| 948 | |
| 949 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 950 | slots |= tbf_ul_slots(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 951 | |
| 952 | if (ms->ul_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 953 | slots |= tbf_ul_slots(ul_tbf_as_tbf(ms->ul_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 954 | |
| 955 | return slots; |
| 956 | } |
| 957 | |
| 958 | uint8_t ms_current_pacch_slots(const struct GprsMs *ms) |
| 959 | { |
| 960 | uint8_t slots = 0; |
| 961 | |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 962 | bool is_dl_active = ms->dl_tbf && tbf_is_tfi_assigned(dl_tbf_as_tbf(ms->dl_tbf)); |
| 963 | bool is_ul_active = ms->ul_tbf && tbf_is_tfi_assigned(ul_tbf_as_tbf(ms->ul_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 964 | |
| 965 | if (!is_dl_active && !is_ul_active) |
| 966 | return 0; |
| 967 | |
| 968 | /* see TS 44.060, 8.1.1.2.2 */ |
| 969 | if (is_dl_active && !is_ul_active) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 970 | slots = tbf_dl_slots(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 971 | else if (!is_dl_active && is_ul_active) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 972 | slots = tbf_ul_slots(ul_tbf_as_tbf(ms->ul_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 973 | else |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 974 | slots = tbf_ul_slots(ul_tbf_as_tbf(ms->ul_tbf)) & |
| 975 | tbf_dl_slots(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 976 | |
| 977 | /* Assume a multislot class 1 device */ |
| 978 | /* TODO: For class 2 devices, this could be removed */ |
| 979 | slots = pcu_lsb(slots); |
| 980 | |
| 981 | return slots; |
| 982 | } |
| 983 | |
| 984 | void ms_set_reserved_slots(struct GprsMs *ms, struct gprs_rlcmac_trx *trx, |
| 985 | uint8_t ul_slots, uint8_t dl_slots) |
| 986 | { |
| 987 | if (ms->current_trx) { |
| 988 | bts_trx_unreserve_slots(ms->current_trx, GPRS_RLCMAC_DL_TBF, |
| 989 | ms->reserved_dl_slots); |
| 990 | bts_trx_unreserve_slots(ms->current_trx, GPRS_RLCMAC_UL_TBF, |
| 991 | ms->reserved_ul_slots); |
| 992 | ms->reserved_dl_slots = 0; |
| 993 | ms->reserved_ul_slots = 0; |
| 994 | } |
| 995 | ms->current_trx = trx; |
| 996 | if (trx) { |
| 997 | ms->reserved_dl_slots = dl_slots; |
| 998 | ms->reserved_ul_slots = ul_slots; |
| 999 | bts_trx_reserve_slots(ms->current_trx, GPRS_RLCMAC_DL_TBF, |
| 1000 | ms->reserved_dl_slots); |
| 1001 | bts_trx_reserve_slots(ms->current_trx, GPRS_RLCMAC_UL_TBF, |
| 1002 | ms->reserved_ul_slots); |
| 1003 | } |
| 1004 | } |
| 1005 | |
| 1006 | struct gprs_rlcmac_tbf *ms_tbf(const struct GprsMs *ms, enum gprs_rlcmac_tbf_direction dir) |
| 1007 | { |
| 1008 | switch (dir) { |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 1009 | case GPRS_RLCMAC_DL_TBF: return dl_tbf_as_tbf(ms->dl_tbf); |
| 1010 | case GPRS_RLCMAC_UL_TBF: return ul_tbf_as_tbf(ms->ul_tbf); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 1011 | } |
| 1012 | |
| 1013 | return NULL; |
| 1014 | } |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1015 | |
Pau Espin Pedrol | 3547d64 | 2022-10-21 15:00:08 +0200 | [diff] [blame] | 1016 | const char *ms_name(const struct GprsMs *ms) |
| 1017 | { |
| 1018 | static char _ms_name_buf[128]; |
| 1019 | return ms_name_buf(ms, _ms_name_buf, sizeof(_ms_name_buf)); |
| 1020 | } |
| 1021 | |
| 1022 | char *ms_name_buf(const struct GprsMs *ms, char *buf, unsigned int buf_size) |
| 1023 | { |
Pau Espin Pedrol | 94f8258 | 2022-11-03 14:16:17 +0100 | [diff] [blame] | 1024 | struct osmo_strbuf sb = { .buf = buf, .len = buf_size }; |
| 1025 | uint32_t tlli = ms_tlli(ms); |
| 1026 | |
| 1027 | OSMO_STRBUF_PRINTF(sb, "MS("); |
| 1028 | if (ms_imsi_is_valid(ms)) |
| 1029 | OSMO_STRBUF_PRINTF(sb, "IMSI-%s:", ms_imsi(ms)); |
| 1030 | if (tlli != GSM_RESERVED_TMSI) |
| 1031 | OSMO_STRBUF_PRINTF(sb, "TLLI-0x%08x:", tlli); |
| 1032 | OSMO_STRBUF_PRINTF(sb, "TA-%" PRIu8 ":MSCLS-%" PRIu8 "-%" PRIu8, |
| 1033 | ms_ta(ms), ms_ms_class(ms), ms_egprs_ms_class(ms)); |
| 1034 | if (ms->ul_tbf) |
| 1035 | OSMO_STRBUF_PRINTF(sb, ":UL"); |
| 1036 | if (ms->dl_tbf) |
| 1037 | OSMO_STRBUF_PRINTF(sb, ":DL"); |
| 1038 | |
| 1039 | OSMO_STRBUF_PRINTF(sb, ")"); |
Pau Espin Pedrol | 3547d64 | 2022-10-21 15:00:08 +0200 | [diff] [blame] | 1040 | return buf; |
| 1041 | } |
| 1042 | |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1043 | int ms_nacc_start(struct GprsMs *ms, Packet_Cell_Change_Notification_t *notif) |
| 1044 | { |
| 1045 | if (!ms->nacc) |
| 1046 | ms->nacc = nacc_fsm_alloc(ms); |
| 1047 | if (!ms->nacc) |
| 1048 | return -EINVAL; |
| 1049 | return osmo_fsm_inst_dispatch(ms->nacc->fi, NACC_EV_RX_CELL_CHG_NOTIFICATION, notif); |
| 1050 | } |
| 1051 | |
| 1052 | bool ms_nacc_rts(const struct GprsMs *ms) |
| 1053 | { |
| 1054 | if (!ms->nacc) |
| 1055 | return false; |
| 1056 | if (ms->nacc->fi->state == NACC_ST_TX_NEIGHBOUR_DATA || |
| 1057 | ms->nacc->fi->state == NACC_ST_TX_CELL_CHG_CONTINUE) |
| 1058 | return true; |
| 1059 | return false; |
| 1060 | } |
| 1061 | |
Pau Espin Pedrol | 952cb3d | 2021-02-01 14:52:48 +0100 | [diff] [blame] | 1062 | 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] | 1063 | { |
| 1064 | int rc; |
| 1065 | struct nacc_ev_create_rlcmac_msg_ctx data_ctx; |
| 1066 | |
Pau Espin Pedrol | 952cb3d | 2021-02-01 14:52:48 +0100 | [diff] [blame] | 1067 | data_ctx = (struct nacc_ev_create_rlcmac_msg_ctx) { |
| 1068 | .tbf = tbf, |
| 1069 | .fn = fn, |
| 1070 | .ts = ts, |
| 1071 | .msg = NULL, |
| 1072 | }; |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1073 | |
| 1074 | rc = osmo_fsm_inst_dispatch(ms->nacc->fi, NACC_EV_CREATE_RLCMAC_MSG, &data_ctx); |
| 1075 | if (rc != 0 || !data_ctx.msg) |
| 1076 | return NULL; |
| 1077 | return data_ctx.msg; |
| 1078 | } |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1079 | |
| 1080 | static void ms_start_llc_timer(struct GprsMs *ms) |
| 1081 | { |
| 1082 | if (the_pcu->vty.llc_idle_ack_csec > 0) { |
| 1083 | struct timespec tv; |
| 1084 | csecs_to_timespec(the_pcu->vty.llc_idle_ack_csec, &tv); |
| 1085 | osmo_timer_schedule(&ms->llc_timer, tv.tv_sec, tv.tv_nsec / 1000); |
| 1086 | } |
| 1087 | } |
| 1088 | |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1089 | /* Can we get to send a DL TBF ass to the MS? */ |
| 1090 | static bool ms_is_reachable_for_dl_ass(const struct GprsMs *ms) |
| 1091 | { |
| 1092 | struct gprs_rlcmac_ul_tbf *ul_tbf = ms_ul_tbf(ms); |
| 1093 | |
| 1094 | /* This function assumes it is called when no DL TBF is present */ |
| 1095 | OSMO_ASSERT(!ms_dl_tbf(ms)); |
| 1096 | |
| 1097 | /* 3GPP TS 44.060 sec 7.1.3.1 Initiation of the Packet resource request procedure: |
| 1098 | * "Furthermore, the mobile station shall not respond to PACKET DOWNLINK ASSIGNMENT |
| 1099 | * or MULTIPLE TBF DOWNLINK ASSIGNMENT messages before contention resolution is |
| 1100 | * completed on the mobile station side." */ |
| 1101 | /* The possible uplink TBF is used to trigger downlink assignment: |
| 1102 | * - If there is no uplink TBF the MS is potentially in packet idle mode |
| 1103 | * and hence assignment will be done over CCCH (PCH) |
| 1104 | * - If there's an uplink TBF but it is finished (waiting for last PKT |
| 1105 | * CTRL ACK after sending last Pkt UL ACK/NACK with FINAL_ACK=1, then we |
| 1106 | * have no ways to contact the MS right now. Assignment will be delayed |
| 1107 | * until PKT CTRL ACK is received and the TBF is released at the MS side |
| 1108 | * (then assignment goes through PCH). |
| 1109 | */ |
| 1110 | if (!ul_tbf) |
| 1111 | return true; |
| 1112 | if (ul_tbf_contention_resolution_done(ul_tbf) && |
| 1113 | !tbf_ul_ack_waiting_cnf_final_ack(ul_tbf)) |
| 1114 | return true; |
| 1115 | |
| 1116 | return false; |
| 1117 | |
| 1118 | } |
| 1119 | |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1120 | /* Alloc a UL TBF to be assigned over PACCH. Called when an MS requests to |
| 1121 | * create a new UL TBF during the end of life of a previous UL TBF (or an SBA). |
| 1122 | * In summary, this TBF is allocated as a consequence of receiving a "Pkt |
| 1123 | * Resource Req" or "Pkt Ctrl Ack" from the MS. |
| 1124 | * See TS 44.060 9.3.2.4.2 "Non-extended uplink TBF mode". |
| 1125 | */ |
| 1126 | struct gprs_rlcmac_ul_tbf *ms_new_ul_tbf_assigned_pacch(struct GprsMs *ms, int8_t use_trx) |
| 1127 | { |
| 1128 | const bool single_slot = false; |
| 1129 | struct gprs_rlcmac_ul_tbf *ul_tbf; |
| 1130 | |
Pau Espin Pedrol | bda7bb7 | 2022-10-31 14:33:09 +0100 | [diff] [blame] | 1131 | ul_tbf = ul_tbf_alloc(ms->bts, ms, use_trx, single_slot); |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1132 | if (!ul_tbf) { |
| 1133 | LOGPMS(ms, DTBF, LOGL_NOTICE, "No PDCH resource\n"); |
| 1134 | /* Caller will most probably send a Imm Ass Reject after return */ |
| 1135 | return NULL; |
| 1136 | } |
| 1137 | osmo_fsm_inst_dispatch(tbf_state_fi(ul_tbf_as_tbf(ul_tbf)), TBF_EV_ASSIGN_ADD_PACCH, NULL); |
| 1138 | /* Contention resolution is considered to be done since TLLI is known in MS */ |
| 1139 | return ul_tbf; |
| 1140 | } |
| 1141 | |
| 1142 | /* Alloc a UL TBF to be assigned over AGCH. Used by request of a "One phase |
| 1143 | * packet access", where MS requested only 1 PDCH TS (TS 44.018 Table 9.1.8.1). */ |
| 1144 | struct gprs_rlcmac_ul_tbf *ms_new_ul_tbf_assigned_agch(struct GprsMs *ms) |
| 1145 | { |
| 1146 | const int8_t trx_no = -1; |
| 1147 | const bool single_slot = true; |
| 1148 | struct gprs_rlcmac_ul_tbf *ul_tbf; |
| 1149 | |
Pau Espin Pedrol | bda7bb7 | 2022-10-31 14:33:09 +0100 | [diff] [blame] | 1150 | ul_tbf = ul_tbf_alloc(ms->bts, ms, trx_no, single_slot); |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1151 | if (!ul_tbf) { |
| 1152 | LOGP(DTBF, LOGL_NOTICE, "No PDCH resource for Uplink TBF\n"); |
| 1153 | /* Caller will most probably send a Imm Ass Reject after return */ |
| 1154 | return NULL; |
| 1155 | } |
| 1156 | osmo_fsm_inst_dispatch(tbf_state_fi(ul_tbf_as_tbf(ul_tbf)), TBF_EV_ASSIGN_ADD_CCCH, NULL); |
| 1157 | return ul_tbf; |
| 1158 | } |
| 1159 | |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1160 | /* A new DL-TBF is allocated and assigned through PACCH using "tbf". |
| 1161 | * "tbf" may be either a UL-TBF or a DL-TBF. |
| 1162 | * Note: This should be called only when MS is reachable, see ms_is_reachable_for_dl_ass(). |
| 1163 | */ |
| 1164 | int ms_new_dl_tbf_assigned_on_pacch(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf) |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1165 | { |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1166 | OSMO_ASSERT(tbf); |
| 1167 | const int8_t trx_no = tbf_get_trx(tbf)->trx_no; |
| 1168 | const bool single_slot = false; |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1169 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
| 1170 | |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1171 | dl_tbf = dl_tbf_alloc(ms->bts, ms, trx_no, single_slot); |
| 1172 | if (!dl_tbf) { |
| 1173 | LOGPMS(ms, DTBF, LOGL_NOTICE, "No PDCH resource\n"); |
| 1174 | return -EBUSY; |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1175 | } |
| 1176 | |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1177 | LOGPTBFDL(dl_tbf, LOGL_DEBUG, "[DOWNLINK] START (PACCH)\n"); |
| 1178 | dl_tbf_trigger_ass_on_pacch(dl_tbf, tbf); |
| 1179 | return 0; |
| 1180 | } |
| 1181 | |
| 1182 | /* A new DL-TBF is allocated and assigned through PCH. |
| 1183 | * Note: This should be called only when MS is reachable, see ms_is_reachable_for_dl_ass(). |
| 1184 | */ |
| 1185 | int ms_new_dl_tbf_assigned_on_pch(struct GprsMs *ms) |
| 1186 | { |
| 1187 | const int8_t trx_no = -1; |
| 1188 | const bool single_slot = true; |
| 1189 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
| 1190 | |
| 1191 | dl_tbf = dl_tbf_alloc(ms->bts, ms, trx_no, single_slot); |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1192 | if (!dl_tbf) { |
| 1193 | LOGPMS(ms, DTBF, LOGL_NOTICE, "No PDCH resource\n"); |
| 1194 | return -EBUSY; |
| 1195 | } |
| 1196 | |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1197 | LOGPTBFDL(dl_tbf, LOGL_DEBUG, "[DOWNLINK] START (PCH)\n"); |
| 1198 | dl_tbf_trigger_ass_on_pch(dl_tbf); |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1199 | return 0; |
| 1200 | } |
| 1201 | |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1202 | int ms_append_llc_dl_data(struct GprsMs *ms, uint16_t pdu_delay_csec, const uint8_t *data, uint16_t len) |
| 1203 | { |
| 1204 | struct timespec expire_time; |
| 1205 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1206 | int rc = 0; |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1207 | |
| 1208 | LOGPMS(ms, DTBFDL, LOGL_DEBUG, "appending %u bytes to DL LLC queue\n", len); |
| 1209 | |
| 1210 | struct msgb *llc_msg = msgb_alloc(len, "llc_pdu_queue"); |
| 1211 | if (!llc_msg) |
| 1212 | return -ENOMEM; |
| 1213 | |
| 1214 | llc_queue_calc_pdu_lifetime(ms->bts, pdu_delay_csec, &expire_time); |
| 1215 | memcpy(msgb_put(llc_msg, len), data, len); |
| 1216 | llc_queue_enqueue(ms_llc_queue(ms), llc_msg, &expire_time); |
| 1217 | ms_start_llc_timer(ms); |
| 1218 | |
| 1219 | dl_tbf = ms_dl_tbf(ms); |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1220 | if (dl_tbf) { |
| 1221 | if (tbf_state(dl_tbf_as_tbf_const(dl_tbf)) == TBF_ST_WAIT_RELEASE) { |
| 1222 | LOGPTBFDL(dl_tbf, LOGL_DEBUG, "in WAIT RELEASE state (T3193), so reuse TBF\n"); |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1223 | rc = ms_new_dl_tbf_assigned_on_pacch(ms, dl_tbf_as_tbf(dl_tbf)); |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1224 | } |
| 1225 | } else { |
| 1226 | /* Check if we can create a DL TBF to start sending the enqueued |
| 1227 | * data. Otherwise it will be triggered later when it is reachable |
| 1228 | * again. */ |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1229 | if (ms_is_reachable_for_dl_ass(ms)) { |
| 1230 | if (ms_ul_tbf(ms)) |
| 1231 | rc = ms_new_dl_tbf_assigned_on_pacch(ms, ul_tbf_as_tbf(ms_ul_tbf(ms))); |
| 1232 | else |
| 1233 | rc = ms_new_dl_tbf_assigned_on_pch(ms); |
| 1234 | } |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1235 | } |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1236 | return rc; |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1237 | } |