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 | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 27 | |
| 28 | #include <time.h> |
| 29 | |
| 30 | #include <osmocom/core/talloc.h> |
| 31 | #include <osmocom/core/utils.h> |
| 32 | #include <osmocom/core/timer.h> |
| 33 | #include <osmocom/gsm/protocol/gsm_04_08.h> |
| 34 | #include <osmocom/gsm/gsm48.h> |
| 35 | #include <osmocom/core/logging.h> |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 36 | #include <osmocom/core/stats.h> |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 37 | #include "coding_scheme.h" |
| 38 | |
| 39 | #define GPRS_CODEL_SLOW_INTERVAL_MS 4000 |
| 40 | |
| 41 | extern void *tall_pcu_ctx; |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 42 | static unsigned int next_ms_ctr_group_id; |
| 43 | |
| 44 | static const struct rate_ctr_desc ms_ctr_description[] = { |
| 45 | [MS_CTR_DL_CTRL_MSG_SCHED] = { "ms:dl_ctrl_msg_sched", "Amount of DL CTRL messages scheduled" }, |
| 46 | }; |
| 47 | |
Pau Espin Pedrol | f5a251b | 2021-01-12 20:57:56 +0100 | [diff] [blame] | 48 | static const struct rate_ctr_group_desc ms_ctrg_desc = { |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 49 | .group_name_prefix = "pcu:ms", |
| 50 | .group_description = "MS Statistics", |
| 51 | .class_id = OSMO_STATS_CLASS_SUBSCRIBER, |
| 52 | .num_ctr = ARRAY_SIZE(ms_ctr_description), |
| 53 | .ctr_desc = ms_ctr_description, |
| 54 | }; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 55 | |
| 56 | static int64_t now_msec() |
| 57 | { |
| 58 | struct timespec ts; |
| 59 | osmo_clock_gettime(CLOCK_MONOTONIC, &ts); |
| 60 | |
| 61 | return (int64_t)(ts.tv_sec) * 1000 + ts.tv_nsec / 1000000; |
| 62 | } |
| 63 | |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame^] | 64 | static void ms_update_status(struct GprsMs *ms); |
| 65 | |
| 66 | static int ms_use_cb(struct osmo_use_count_entry *e, int32_t old_use_count, const char *file, int line) |
| 67 | { |
| 68 | struct GprsMs *ms = e->use_count->talloc_object; |
| 69 | int32_t total; |
| 70 | int level; |
| 71 | char buf[1024]; |
| 72 | |
| 73 | if (!e->use) |
| 74 | return -EINVAL; |
| 75 | |
| 76 | total = osmo_use_count_total(&ms->use_count); |
| 77 | |
| 78 | if (total == 0 |
| 79 | || (total == 1 && old_use_count == 0 && e->count == 1)) |
| 80 | level = LOGL_INFO; |
| 81 | else |
| 82 | level = LOGL_DEBUG; |
| 83 | |
| 84 | |
| 85 | LOGPSRC(DRLCMAC, level, file, line, "%s: %s %s: now used by %s\n", |
| 86 | ms_name(ms), |
| 87 | (e->count - old_use_count) > 0 ? "+" : "-", e->use, |
| 88 | (osmo_use_count_to_str_buf(buf, sizeof(buf), &ms->use_count), buf)); |
| 89 | |
| 90 | if (e->count < 0) |
| 91 | return -ERANGE; |
| 92 | |
| 93 | if (total == 0) |
| 94 | ms_update_status(ms); |
| 95 | return 0; |
| 96 | } |
| 97 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 98 | void gprs_default_cb_ms_idle(struct GprsMs *ms) |
| 99 | { |
Pau Espin Pedrol | 9da0686 | 2023-04-17 19:00:04 +0200 | [diff] [blame] | 100 | if (ms_is_idle(ms)) |
| 101 | talloc_free(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | void gprs_default_cb_ms_active(struct GprsMs *ms) |
| 105 | { |
| 106 | /* do nothing */ |
| 107 | } |
| 108 | |
| 109 | static struct gpr_ms_callback gprs_default_cb = { |
| 110 | .ms_idle = gprs_default_cb_ms_idle, |
| 111 | .ms_active = gprs_default_cb_ms_active, |
| 112 | }; |
| 113 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 114 | static void ms_release_timer_cb(void *data) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 115 | { |
| 116 | struct GprsMs *ms = (struct GprsMs *) data; |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 117 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Release timer expired\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 118 | |
| 119 | if (ms->timer.data) { |
| 120 | ms->timer.data = NULL; |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame^] | 121 | ms_unref(ms, MS_USE_RELEASE_TIMER); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 122 | } |
| 123 | } |
| 124 | |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 125 | static void ms_llc_timer_cb(void *_ms) |
| 126 | { |
| 127 | struct GprsMs *ms = _ms; |
| 128 | struct gprs_rlcmac_dl_tbf *dl_tbf = ms_dl_tbf(ms); |
| 129 | |
| 130 | if (!dl_tbf) |
| 131 | return; |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 132 | 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] | 133 | return; |
| 134 | |
Pau Espin Pedrol | bd1f01f | 2022-10-27 15:19:39 +0200 | [diff] [blame] | 135 | 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] | 136 | |
Pau Espin Pedrol | 8fa3e06 | 2022-10-28 17:38:52 +0200 | [diff] [blame] | 137 | dl_tbf_request_dl_ack(dl_tbf); |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 138 | } |
| 139 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 140 | static int ms_talloc_destructor(struct GprsMs *ms); |
Pau Espin Pedrol | f80cc5b | 2023-04-17 14:25:51 +0200 | [diff] [blame] | 141 | struct GprsMs *ms_alloc(struct gprs_rlcmac_bts *bts) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 142 | { |
| 143 | struct GprsMs *ms = talloc_zero(tall_pcu_ctx, struct GprsMs); |
Pau Espin Pedrol | b498746 | 2022-04-01 17:21:08 +0200 | [diff] [blame] | 144 | OSMO_ASSERT(bts); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 145 | |
| 146 | talloc_set_destructor(ms, ms_talloc_destructor); |
| 147 | |
Pau Espin Pedrol | fe7aee9 | 2023-04-17 18:23:56 +0200 | [diff] [blame] | 148 | llist_add(&ms->list, &bts->ms_list); |
Pau Espin Pedrol | 9da0686 | 2023-04-17 19:00:04 +0200 | [diff] [blame] | 149 | bts_stat_item_inc(bts, STAT_MS_PRESENT); |
Pau Espin Pedrol | fe7aee9 | 2023-04-17 18:23:56 +0200 | [diff] [blame] | 150 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 151 | ms->bts = bts; |
| 152 | ms->cb = gprs_default_cb; |
Pau Espin Pedrol | f80cc5b | 2023-04-17 14:25:51 +0200 | [diff] [blame] | 153 | ms->tlli = GSM_RESERVED_TMSI; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 154 | ms->new_ul_tlli = GSM_RESERVED_TMSI; |
| 155 | ms->new_dl_tlli = GSM_RESERVED_TMSI; |
| 156 | ms->ta = GSM48_TA_INVALID; |
| 157 | ms->current_cs_ul = UNKNOWN; |
| 158 | ms->current_cs_dl = UNKNOWN; |
| 159 | ms->is_idle = true; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 160 | INIT_LLIST_HEAD(&ms->old_tbfs); |
| 161 | |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame^] | 162 | ms->use_count = (struct osmo_use_count){ |
| 163 | .talloc_object = ms, |
| 164 | .use_cb = ms_use_cb, |
| 165 | }; |
| 166 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 167 | int codel_interval = LLC_CODEL_USE_DEFAULT; |
| 168 | |
Pau Espin Pedrol | f80cc5b | 2023-04-17 14:25:51 +0200 | [diff] [blame] | 169 | LOGP(DRLCMAC, LOGL_INFO, "Creating MS object\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 170 | |
| 171 | ms->imsi[0] = '\0'; |
Pau Espin Pedrol | c7802d9 | 2022-05-09 16:07:52 +0200 | [diff] [blame] | 172 | osmo_timer_setup(&ms->timer, ms_release_timer_cb, NULL); |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 173 | llc_queue_init(&ms->llc_queue, ms); |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 174 | memset(&ms->llc_timer, 0, sizeof(ms->llc_timer)); |
| 175 | osmo_timer_setup(&ms->llc_timer, ms_llc_timer_cb, ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 176 | |
| 177 | ms_set_mode(ms, GPRS); |
| 178 | |
Pau Espin Pedrol | b498746 | 2022-04-01 17:21:08 +0200 | [diff] [blame] | 179 | codel_interval = the_pcu->vty.llc_codel_interval_msec; |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 180 | if (codel_interval == LLC_CODEL_USE_DEFAULT) |
| 181 | codel_interval = GPRS_CODEL_SLOW_INTERVAL_MS; |
| 182 | llc_queue_set_codel_interval(&ms->llc_queue, codel_interval); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 183 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 184 | ms->last_cs_not_low = now_msec(); |
| 185 | ms->app_info_pending = false; |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 186 | |
| 187 | ms->ctrs = rate_ctr_group_alloc(ms, &ms_ctrg_desc, next_ms_ctr_group_id++); |
| 188 | if (!ms->ctrs) |
| 189 | goto free_ret; |
| 190 | |
Pau Espin Pedrol | 9da0686 | 2023-04-17 19:00:04 +0200 | [diff] [blame] | 191 | ms_set_timeout(ms, osmo_tdef_get(bts->pcu->T_defs, -2030, OSMO_TDEF_S, -1)); |
| 192 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 193 | return ms; |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 194 | free_ret: |
| 195 | talloc_free(ms); |
| 196 | return NULL; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | static int ms_talloc_destructor(struct GprsMs *ms) |
| 200 | { |
| 201 | struct llist_item *pos, *tmp; |
| 202 | |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 203 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Destroying MS object\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 204 | |
Pau Espin Pedrol | 9da0686 | 2023-04-17 19:00:04 +0200 | [diff] [blame] | 205 | bts_stat_item_dec(ms->bts, STAT_MS_PRESENT); |
Pau Espin Pedrol | fe7aee9 | 2023-04-17 18:23:56 +0200 | [diff] [blame] | 206 | llist_del(&ms->list); |
| 207 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 208 | ms_set_reserved_slots(ms, NULL, 0, 0); |
| 209 | |
Vadim Yanitskiy | e33c236 | 2022-07-22 03:44:44 +0700 | [diff] [blame] | 210 | osmo_timer_del(&ms->timer); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 211 | |
| 212 | if (ms->ul_tbf) { |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 213 | tbf_set_ms(ul_tbf_as_tbf(ms->ul_tbf), NULL); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 214 | ms->ul_tbf = NULL; |
| 215 | } |
| 216 | |
| 217 | if (ms->dl_tbf) { |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 218 | tbf_set_ms(dl_tbf_as_tbf(ms->dl_tbf), NULL); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 219 | ms->dl_tbf = NULL; |
| 220 | } |
| 221 | |
| 222 | llist_for_each_entry_safe(pos, tmp, &ms->old_tbfs, list) { |
| 223 | struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)pos->entry; |
| 224 | tbf_set_ms(tbf, NULL); |
| 225 | } |
| 226 | |
| 227 | llc_queue_clear(&ms->llc_queue, ms->bts); |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 228 | osmo_timer_del(&ms->llc_timer); |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 229 | |
| 230 | if (ms->ctrs) |
| 231 | rate_ctr_group_free(ms->ctrs); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | |
| 236 | void ms_set_callback(struct GprsMs *ms, struct gpr_ms_callback *cb) |
| 237 | { |
| 238 | if (cb) |
| 239 | ms->cb = *cb; |
| 240 | else |
| 241 | ms->cb = gprs_default_cb; |
| 242 | } |
| 243 | |
| 244 | static void ms_update_status(struct GprsMs *ms) |
| 245 | { |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame^] | 246 | if (osmo_use_count_total(&ms->use_count) > 0) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 247 | return; |
| 248 | |
| 249 | if (ms_is_idle(ms) && !ms->is_idle) { |
| 250 | ms->is_idle = true; |
| 251 | ms->cb.ms_idle(ms); |
| 252 | /* this can be deleted by now, do not access it */ |
| 253 | return; |
| 254 | } |
| 255 | |
| 256 | if (!ms_is_idle(ms) && ms->is_idle) { |
| 257 | ms->is_idle = false; |
| 258 | ms->cb.ms_active(ms); |
| 259 | } |
| 260 | } |
| 261 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 262 | static void ms_release_timer_start(struct GprsMs *ms) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 263 | { |
Pau Espin Pedrol | 14379ef | 2023-04-17 20:43:26 +0200 | [diff] [blame] | 264 | /* Immediate free(): |
| 265 | * Skip delaying free() through release timer if delay is configured to be 0. |
| 266 | * This is useful for synced freed during unit tests. |
| 267 | */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 268 | if (ms->delay == 0) |
| 269 | return; |
| 270 | |
Pau Espin Pedrol | 14379ef | 2023-04-17 20:43:26 +0200 | [diff] [blame] | 271 | /* Immediate free(): |
| 272 | * Skip delaying free() through release timer if TMSI is not |
| 273 | * known, since those cannot really be reused. |
| 274 | */ |
| 275 | if (ms_tlli(ms) == GSM_RESERVED_TMSI) |
| 276 | return; |
| 277 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 278 | LOGPMS(ms, DRLCMAC, LOGL_DEBUG, "Schedule MS release in %u secs\n", ms->delay); |
| 279 | |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame^] | 280 | if (!ms->timer.data) { |
| 281 | ms_ref(ms, MS_USE_RELEASE_TIMER); |
| 282 | ms->timer.data = ms; |
| 283 | } |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 284 | |
| 285 | osmo_timer_schedule(&ms->timer, ms->delay, 0); |
| 286 | } |
| 287 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 288 | static void ms_release_timer_stop(struct GprsMs *ms) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 289 | { |
| 290 | if (!ms->timer.data) |
| 291 | return; |
| 292 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 293 | LOGPMS(ms, DRLCMAC, LOGL_DEBUG, "Cancel scheduled MS release\n"); |
| 294 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 295 | osmo_timer_del(&ms->timer); |
| 296 | ms->timer.data = NULL; |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame^] | 297 | ms_unref(ms, MS_USE_RELEASE_TIMER); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | void ms_set_mode(struct GprsMs *ms, enum mcs_kind mode) |
| 301 | { |
| 302 | ms->mode = mode; |
| 303 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 304 | switch (ms->mode) { |
| 305 | case GPRS: |
| 306 | if (!mcs_is_gprs(ms->current_cs_ul)) { |
| 307 | ms->current_cs_ul = mcs_get_gprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 308 | ms->bts->initial_cs_ul); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 309 | if (!mcs_is_valid(ms->current_cs_ul)) |
| 310 | ms->current_cs_ul = CS1; |
| 311 | } |
| 312 | if (!mcs_is_gprs(ms->current_cs_dl)) { |
| 313 | ms->current_cs_dl = mcs_get_gprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 314 | ms->bts->initial_cs_dl); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 315 | if (!mcs_is_valid(ms->current_cs_dl)) |
| 316 | ms->current_cs_dl = CS1; |
| 317 | } |
| 318 | break; |
| 319 | |
| 320 | case EGPRS_GMSK: |
Pau Espin Pedrol | 7bb8cd6 | 2021-01-25 15:08:35 +0100 | [diff] [blame] | 321 | if (!mcs_is_edge_gmsk(ms->current_cs_ul)) { |
| 322 | ms->current_cs_ul = mcs_get_egprs_by_num( |
| 323 | ms->bts->initial_mcs_ul); |
| 324 | if (!mcs_is_valid(ms->current_cs_ul)) |
| 325 | ms->current_cs_ul = MCS1; |
| 326 | } |
| 327 | if (!mcs_is_edge_gmsk(ms->current_cs_dl)) { |
| 328 | ms->current_cs_dl = mcs_get_egprs_by_num( |
| 329 | ms->bts->initial_mcs_dl); |
| 330 | if (!mcs_is_valid(ms->current_cs_dl)) |
| 331 | ms->current_cs_dl = MCS1; |
| 332 | } |
| 333 | break; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 334 | case EGPRS: |
| 335 | if (!mcs_is_edge(ms->current_cs_ul)) { |
| 336 | ms->current_cs_ul = mcs_get_egprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 337 | ms->bts->initial_mcs_ul); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 338 | if (!mcs_is_valid(ms->current_cs_ul)) |
| 339 | ms->current_cs_ul = MCS1; |
| 340 | } |
| 341 | if (!mcs_is_edge(ms->current_cs_dl)) { |
| 342 | ms->current_cs_dl = mcs_get_egprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 343 | ms->bts->initial_mcs_dl); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 344 | if (!mcs_is_valid(ms->current_cs_dl)) |
| 345 | ms->current_cs_dl = MCS1; |
| 346 | } |
| 347 | break; |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | static void ms_attach_ul_tbf(struct GprsMs *ms, struct gprs_rlcmac_ul_tbf *tbf) |
| 352 | { |
| 353 | if (ms->ul_tbf == tbf) |
| 354 | return; |
| 355 | |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 356 | 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] | 357 | |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame^] | 358 | ms_ref(ms, __func__); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 359 | |
| 360 | if (ms->ul_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 361 | 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] | 362 | |
| 363 | ms->ul_tbf = tbf; |
| 364 | |
| 365 | if (tbf) |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 366 | ms_release_timer_stop(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 367 | |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame^] | 368 | ms_unref(ms, __func__); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | static void ms_attach_dl_tbf(struct GprsMs *ms, struct gprs_rlcmac_dl_tbf *tbf) |
| 372 | { |
| 373 | if (ms->dl_tbf == tbf) |
| 374 | return; |
| 375 | |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 376 | 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] | 377 | |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame^] | 378 | ms_ref(ms, __func__); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 379 | |
| 380 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 381 | 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] | 382 | |
| 383 | ms->dl_tbf = tbf; |
| 384 | |
| 385 | if (tbf) |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 386 | ms_release_timer_stop(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 387 | |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame^] | 388 | ms_unref(ms, __func__); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | void ms_attach_tbf(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf) |
| 392 | { |
Pau Espin Pedrol | b5fece9 | 2021-08-23 16:58:04 +0200 | [diff] [blame] | 393 | if (tbf_direction(tbf) == GPRS_RLCMAC_DL_TBF) |
Pau Espin Pedrol | cc30b05 | 2022-10-27 15:25:55 +0200 | [diff] [blame] | 394 | ms_attach_dl_tbf(ms, tbf_as_dl_tbf(tbf)); |
Pau Espin Pedrol | b5fece9 | 2021-08-23 16:58:04 +0200 | [diff] [blame] | 395 | else |
Pau Espin Pedrol | cc30b05 | 2022-10-27 15:25:55 +0200 | [diff] [blame] | 396 | ms_attach_ul_tbf(ms, tbf_as_ul_tbf(tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | void ms_detach_tbf(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf) |
| 400 | { |
| 401 | if (tbf == (struct gprs_rlcmac_tbf *)(ms->ul_tbf)) { |
| 402 | ms->ul_tbf = NULL; |
| 403 | } else if (tbf == (struct gprs_rlcmac_tbf *)(ms->dl_tbf)) { |
| 404 | ms->dl_tbf = NULL; |
| 405 | } else { |
| 406 | bool found = false; |
| 407 | |
| 408 | struct llist_item *pos, *tmp; |
| 409 | llist_for_each_entry_safe(pos, tmp, &ms->old_tbfs, list) { |
| 410 | struct gprs_rlcmac_tbf *tmp_tbf = (struct gprs_rlcmac_tbf *)pos->entry; |
| 411 | if (tmp_tbf == tbf) { |
| 412 | llist_del(&pos->list); |
| 413 | found = true; |
| 414 | break; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | /* Protect against recursive calls via set_ms() */ |
| 419 | if (!found) |
| 420 | return; |
| 421 | } |
| 422 | |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 423 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Detaching TBF: %s\n", |
| 424 | tbf_name(tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 425 | |
| 426 | if (tbf_ms(tbf) == ms) |
| 427 | tbf_set_ms(tbf, NULL); |
| 428 | |
| 429 | if (!ms->dl_tbf && !ms->ul_tbf) { |
| 430 | ms_set_reserved_slots(ms, NULL, 0, 0); |
Pau Espin Pedrol | 9935d0d | 2022-12-13 18:29:25 +0100 | [diff] [blame] | 431 | ms->first_common_ts = NULL; |
Pau Espin Pedrol | 14379ef | 2023-04-17 20:43:26 +0200 | [diff] [blame] | 432 | ms_release_timer_start(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 433 | } |
| 434 | |
| 435 | ms_update_status(ms); |
| 436 | } |
| 437 | |
| 438 | void ms_reset(struct GprsMs *ms) |
| 439 | { |
Pau Espin Pedrol | 11f0110 | 2021-03-03 20:37:38 +0100 | [diff] [blame] | 440 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Clearing MS object\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 441 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 442 | ms_release_timer_stop(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 443 | |
| 444 | ms->tlli = GSM_RESERVED_TMSI; |
| 445 | ms->new_dl_tlli = ms->tlli; |
| 446 | ms->new_ul_tlli = ms->tlli; |
| 447 | ms->imsi[0] = '\0'; |
| 448 | } |
| 449 | |
Pau Espin Pedrol | 8abe13c | 2022-10-21 18:49:48 +0200 | [diff] [blame] | 450 | /* This function should be called on the MS object of a TBF each time an RLCMAC |
| 451 | * block is received for it with TLLI information. |
| 452 | * Besides updating the TLLI field on the MS object, it also seeks for other MS |
| 453 | * objects in the store and merges them into the current MS object. The MS |
| 454 | * duplication happened because we don't learn the TLLI of the created TBF until |
| 455 | * a later point. */ |
| 456 | void ms_update_announced_tlli(struct GprsMs *ms, uint32_t tlli) |
| 457 | { |
| 458 | struct GprsMs *old_ms = NULL; |
| 459 | |
| 460 | if (tlli == GSM_RESERVED_TMSI) |
| 461 | return; |
| 462 | |
| 463 | /* When the TLLI does not match the ms, check if there is another |
| 464 | * MS object that belongs to that TLLI and if yes make sure one of them |
| 465 | * gets deleted. */ |
| 466 | if (!ms_check_tlli(ms, tlli)) |
Pau Espin Pedrol | eb0a052 | 2023-04-17 16:33:35 +0200 | [diff] [blame] | 467 | old_ms = bts_get_ms_by_tlli(ms->bts, tlli, GSM_RESERVED_TMSI); |
Pau Espin Pedrol | 8abe13c | 2022-10-21 18:49:48 +0200 | [diff] [blame] | 468 | |
| 469 | ms_set_tlli(ms, tlli); |
| 470 | |
| 471 | if (old_ms) |
| 472 | ms_merge_and_clear_ms(ms, old_ms); |
| 473 | /* old_ms may no longer be available here */ |
| 474 | } |
| 475 | |
Pau Espin Pedrol | 32416fd | 2022-10-31 12:55:03 +0100 | [diff] [blame] | 476 | /* Merge 'old_ms' object into 'ms' object. |
| 477 | * 'old_ms' may be freed during the call to this function, don't use the pointer to it afterwards */ |
| 478 | 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] | 479 | { |
Pau Espin Pedrol | 32416fd | 2022-10-31 12:55:03 +0100 | [diff] [blame] | 480 | char old_ms_name[128]; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 481 | OSMO_ASSERT(old_ms != ms); |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame^] | 482 | ms_ref(old_ms, __func__); |
Pau Espin Pedrol | 32416fd | 2022-10-31 12:55:03 +0100 | [diff] [blame] | 483 | |
| 484 | ms_name_buf(old_ms, old_ms_name, sizeof(old_ms_name)); |
| 485 | |
| 486 | 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] | 487 | |
| 488 | if (strlen(ms_imsi(ms)) == 0 && strlen(ms_imsi(old_ms)) != 0) |
| 489 | osmo_strlcpy(ms->imsi, ms_imsi(old_ms), sizeof(ms->imsi)); |
| 490 | |
| 491 | if (!ms_ms_class(ms) && ms_ms_class(old_ms)) |
| 492 | ms_set_ms_class(ms, ms_ms_class(old_ms)); |
| 493 | |
| 494 | if (!ms_egprs_ms_class(ms) && ms_egprs_ms_class(old_ms)) |
| 495 | ms_set_egprs_ms_class(ms, ms_egprs_ms_class(old_ms)); |
| 496 | |
| 497 | llc_queue_move_and_merge(&ms->llc_queue, &old_ms->llc_queue); |
| 498 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 499 | /* Clean up the old MS object */ |
| 500 | /* TODO: Use timer? */ |
| 501 | if (ms_ul_tbf(old_ms) && !tbf_timers_pending((struct gprs_rlcmac_tbf *)ms_ul_tbf(old_ms), T_MAX)) |
| 502 | tbf_free((struct gprs_rlcmac_tbf *)ms_ul_tbf(old_ms)); |
| 503 | if (ms_dl_tbf(old_ms) && !tbf_timers_pending((struct gprs_rlcmac_tbf *)ms_dl_tbf(old_ms), T_MAX)) |
| 504 | tbf_free((struct gprs_rlcmac_tbf *)ms_dl_tbf(old_ms)); |
| 505 | |
Pau Espin Pedrol | 32416fd | 2022-10-31 12:55:03 +0100 | [diff] [blame] | 506 | ms_reset(old_ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 507 | |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame^] | 508 | ms_unref(old_ms, __func__); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 509 | } |
| 510 | |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 511 | /* Apply changes to the TLLI directly, used interally by functions below: */ |
| 512 | static void ms_apply_tlli_change(struct GprsMs *ms, uint32_t tlli) |
| 513 | { |
| 514 | ms->tlli = tlli; |
| 515 | ms->new_dl_tlli = GSM_RESERVED_TMSI; |
| 516 | ms->new_ul_tlli = GSM_RESERVED_TMSI; |
| 517 | |
| 518 | /* Update TBF FSM names: */ |
| 519 | if (ms->ul_tbf) |
| 520 | tbf_update_state_fsm_name(ul_tbf_as_tbf(ms->ul_tbf)); |
| 521 | if (ms->dl_tbf) |
| 522 | tbf_update_state_fsm_name(dl_tbf_as_tbf(ms->dl_tbf)); |
| 523 | } |
| 524 | |
Pau Espin Pedrol | 0b5997e | 2022-10-21 14:10:41 +0200 | [diff] [blame] | 525 | /* 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] | 526 | void ms_set_tlli(struct GprsMs *ms, uint32_t tlli) |
| 527 | { |
| 528 | if (tlli == ms->tlli || tlli == ms->new_ul_tlli) |
| 529 | return; |
| 530 | |
| 531 | if (tlli != ms->new_dl_tlli) { |
| 532 | LOGP(DRLCMAC, LOGL_INFO, |
| 533 | "Modifying MS object, UL TLLI: 0x%08x -> 0x%08x, " |
| 534 | "not yet confirmed\n", |
| 535 | ms_tlli(ms), tlli); |
| 536 | ms->new_ul_tlli = tlli; |
| 537 | return; |
| 538 | } |
| 539 | |
| 540 | LOGP(DRLCMAC, LOGL_INFO, |
| 541 | "Modifying MS object, TLLI: 0x%08x -> 0x%08x, " |
| 542 | "already confirmed partly\n", |
| 543 | ms->tlli, tlli); |
| 544 | |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 545 | ms_apply_tlli_change(ms, tlli); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 546 | } |
| 547 | |
Pau Espin Pedrol | 0b5997e | 2022-10-21 14:10:41 +0200 | [diff] [blame] | 548 | /* 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] | 549 | bool ms_confirm_tlli(struct GprsMs *ms, uint32_t tlli) |
| 550 | { |
| 551 | if (tlli == ms->tlli || tlli == ms->new_dl_tlli) |
| 552 | return false; |
| 553 | |
| 554 | if (tlli != ms->new_ul_tlli) { |
| 555 | /* The MS has not sent a message with the new TLLI, which may |
| 556 | * happen according to the spec [TODO: add reference]. */ |
| 557 | |
| 558 | LOGP(DRLCMAC, LOGL_INFO, |
| 559 | "The MS object cannot fully confirm an unexpected TLLI: 0x%08x, " |
| 560 | "partly confirmed\n", tlli); |
| 561 | /* Use the network's idea of TLLI as candidate, this does not |
| 562 | * change the result value of tlli() */ |
| 563 | ms->new_dl_tlli = tlli; |
| 564 | return false; |
| 565 | } |
| 566 | |
| 567 | LOGP(DRLCMAC, LOGL_INFO, |
| 568 | "Modifying MS object, TLLI: 0x%08x confirmed\n", tlli); |
| 569 | |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 570 | ms_apply_tlli_change(ms, tlli); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 571 | |
| 572 | return true; |
| 573 | } |
| 574 | |
| 575 | void ms_set_imsi(struct GprsMs *ms, const char *imsi) |
| 576 | { |
| 577 | if (!imsi) { |
| 578 | LOGP(DRLCMAC, LOGL_ERROR, "Expected IMSI!\n"); |
| 579 | return; |
| 580 | } |
| 581 | |
| 582 | if (imsi[0] && strlen(imsi) < 3) { |
| 583 | LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI '%s'!\n", |
| 584 | imsi); |
| 585 | return; |
| 586 | } |
| 587 | |
| 588 | if (strcmp(imsi, ms->imsi) == 0) |
| 589 | return; |
| 590 | |
| 591 | LOGP(DRLCMAC, LOGL_INFO, |
| 592 | "Modifying MS object, TLLI = 0x%08x, IMSI '%s' -> '%s'\n", |
| 593 | ms_tlli(ms), ms->imsi, imsi); |
| 594 | |
Pau Espin Pedrol | cde18c5 | 2023-04-17 18:16:48 +0200 | [diff] [blame] | 595 | struct GprsMs *old_ms = bts_get_ms_by_imsi(ms->bts, imsi); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 596 | /* Check if we are going to store a different MS object with already |
| 597 | existing IMSI. This is probably a bug in code calling this function, |
| 598 | since it should take care of this explicitly */ |
| 599 | if (old_ms) { |
| 600 | /* We cannot find ms->ms by IMSI since we know that it has a |
| 601 | * different IMSI */ |
| 602 | OSMO_ASSERT(old_ms != ms); |
| 603 | |
| 604 | LOGPMS(ms, DRLCMAC, LOGL_NOTICE, |
| 605 | "IMSI '%s' was already assigned to another " |
| 606 | "MS object: TLLI = 0x%08x, that IMSI will be removed\n", |
| 607 | imsi, ms_tlli(old_ms)); |
| 608 | |
| 609 | ms_merge_and_clear_ms(ms, old_ms); |
Pau Espin Pedrol | b8ff74b | 2022-10-31 12:58:46 +0100 | [diff] [blame] | 610 | /* old_ms may no longer be available here */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 611 | } |
| 612 | |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 613 | /* Store the new IMSI: */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 614 | osmo_strlcpy(ms->imsi, imsi, sizeof(ms->imsi)); |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 615 | |
| 616 | /* Update TBF FSM names: */ |
| 617 | if (ms->ul_tbf) |
| 618 | tbf_update_state_fsm_name(ul_tbf_as_tbf(ms->ul_tbf)); |
| 619 | if (ms->dl_tbf) |
| 620 | 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] | 621 | } |
| 622 | |
| 623 | void ms_set_ta(struct GprsMs *ms, uint8_t ta_) |
| 624 | { |
| 625 | if (ta_ == ms->ta) |
| 626 | return; |
| 627 | |
| 628 | if (gsm48_ta_is_valid(ta_)) { |
| 629 | LOGP(DRLCMAC, LOGL_INFO, |
| 630 | "Modifying MS object, TLLI = 0x%08x, TA %d -> %d\n", |
| 631 | ms_tlli(ms), ms->ta, ta_); |
| 632 | ms->ta = ta_; |
| 633 | } else |
| 634 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 635 | "MS object, TLLI = 0x%08x, invalid TA %d rejected (old " |
| 636 | "value %d kept)\n", ms_tlli(ms), ta_, ms->ta); |
| 637 | } |
| 638 | |
| 639 | void ms_set_ms_class(struct GprsMs *ms, uint8_t ms_class_) |
| 640 | { |
| 641 | if (ms_class_ == ms->ms_class) |
| 642 | return; |
| 643 | |
| 644 | LOGP(DRLCMAC, LOGL_INFO, |
| 645 | "Modifying MS object, TLLI = 0x%08x, MS class %d -> %d\n", |
| 646 | ms_tlli(ms), ms->ms_class, ms_class_); |
| 647 | |
| 648 | ms->ms_class = ms_class_; |
| 649 | } |
| 650 | |
| 651 | void ms_set_egprs_ms_class(struct GprsMs *ms, uint8_t ms_class_) |
| 652 | { |
| 653 | if (ms_class_ == ms->egprs_ms_class) |
| 654 | return; |
| 655 | |
| 656 | LOGP(DRLCMAC, LOGL_INFO, |
| 657 | "Modifying MS object, TLLI = 0x%08x, EGPRS MS class %d -> %d\n", |
| 658 | ms_tlli(ms), ms->egprs_ms_class, ms_class_); |
| 659 | |
| 660 | ms->egprs_ms_class = ms_class_; |
| 661 | |
| 662 | if (!bts_max_mcs_ul(ms->bts) || !bts_max_mcs_dl(ms->bts)) { |
| 663 | LOGPMS(ms, DRLCMAC, LOGL_DEBUG, |
| 664 | "Avoid enabling EGPRS because use of MCS is disabled: ul=%u dl=%u\n", |
| 665 | bts_max_mcs_ul(ms->bts), bts_max_mcs_dl(ms->bts)); |
| 666 | return; |
| 667 | } |
| 668 | |
| 669 | if (mcs_is_edge_gmsk(mcs_get_egprs_by_num(bts_max_mcs_ul(ms->bts))) && |
| 670 | mcs_is_edge_gmsk(mcs_get_egprs_by_num(bts_max_mcs_dl(ms->bts))) && |
| 671 | ms_mode(ms) != EGPRS) |
| 672 | { |
| 673 | ms_set_mode(ms, EGPRS_GMSK); |
| 674 | } else { |
| 675 | ms_set_mode(ms, EGPRS); |
| 676 | } |
| 677 | LOGPMS(ms, DRLCMAC, LOGL_INFO, "Enabled EGPRS, mode %s\n", mode_name(ms_mode(ms))); |
| 678 | } |
| 679 | |
| 680 | void ms_update_error_rate(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf, int error_rate) |
| 681 | { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 682 | int64_t now; |
| 683 | enum CodingScheme max_cs_dl = ms_max_cs_dl(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 684 | OSMO_ASSERT(max_cs_dl); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 685 | |
| 686 | if (error_rate < 0) |
| 687 | return; |
| 688 | |
| 689 | now = now_msec(); |
| 690 | |
| 691 | /* TODO: Check for TBF direction */ |
| 692 | /* TODO: Support different CS values for UL and DL */ |
| 693 | |
| 694 | ms->nack_rate_dl = error_rate; |
| 695 | |
Pau Espin Pedrol | e8dcf64 | 2021-01-14 13:17:01 +0100 | [diff] [blame] | 696 | if (error_rate > the_pcu->vty.cs_adj_upper_limit) { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 697 | if (mcs_chan_code(ms->current_cs_dl) > 0) { |
| 698 | mcs_dec_kind(&ms->current_cs_dl, ms_mode(ms)); |
| 699 | LOGP(DRLCMACDL, LOGL_INFO, |
| 700 | "MS (IMSI %s): High error rate %d%%, " |
| 701 | "reducing CS level to %s\n", |
| 702 | ms_imsi(ms), error_rate, mcs_name(ms->current_cs_dl)); |
| 703 | ms->last_cs_not_low = now; |
| 704 | } |
Pau Espin Pedrol | e8dcf64 | 2021-01-14 13:17:01 +0100 | [diff] [blame] | 705 | } else if (error_rate < the_pcu->vty.cs_adj_lower_limit) { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 706 | if (ms->current_cs_dl < max_cs_dl) { |
| 707 | if (now - ms->last_cs_not_low > 1000) { |
| 708 | mcs_inc_kind(&ms->current_cs_dl, ms_mode(ms)); |
| 709 | |
| 710 | LOGP(DRLCMACDL, LOGL_INFO, |
| 711 | "MS (IMSI %s): Low error rate %d%%, " |
| 712 | "increasing DL CS level to %s\n", |
| 713 | ms_imsi(ms), error_rate, |
| 714 | mcs_name(ms->current_cs_dl)); |
| 715 | ms->last_cs_not_low = now; |
| 716 | } else { |
| 717 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 718 | "MS (IMSI %s): Low error rate %d%%, " |
| 719 | "ignored (within blocking period)\n", |
| 720 | ms_imsi(ms), error_rate); |
| 721 | } |
| 722 | } |
| 723 | } else { |
| 724 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 725 | "MS (IMSI %s): Medium error rate %d%%, ignored\n", |
| 726 | ms_imsi(ms), error_rate); |
| 727 | ms->last_cs_not_low = now; |
| 728 | } |
| 729 | } |
| 730 | |
| 731 | enum CodingScheme ms_max_cs_ul(const struct GprsMs *ms) |
| 732 | { |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 733 | enum CodingScheme cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 734 | OSMO_ASSERT(ms->bts != NULL); |
| 735 | |
| 736 | if (mcs_is_gprs(ms->current_cs_ul)) { |
| 737 | if (!bts_max_cs_ul(ms->bts)) { |
| 738 | return CS4; |
| 739 | } |
| 740 | |
| 741 | return mcs_get_gprs_by_num(bts_max_cs_ul(ms->bts)); |
| 742 | } |
| 743 | |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 744 | cs = mcs_get_egprs_by_num(bts_max_mcs_ul(ms->bts)); |
| 745 | if (ms_mode(ms) == EGPRS_GMSK && cs > MCS4) |
| 746 | cs = MCS4; |
| 747 | return cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 748 | } |
| 749 | |
| 750 | void ms_set_current_cs_dl(struct GprsMs *ms, enum CodingScheme scheme) |
| 751 | { |
| 752 | ms->current_cs_dl = scheme; |
| 753 | } |
| 754 | |
| 755 | enum CodingScheme ms_max_cs_dl(const struct GprsMs *ms) |
| 756 | { |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 757 | enum CodingScheme cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 758 | OSMO_ASSERT(ms->bts != NULL); |
| 759 | |
| 760 | if (mcs_is_gprs(ms->current_cs_dl)) { |
| 761 | if (!bts_max_cs_dl(ms->bts)) { |
| 762 | return CS4; |
| 763 | } |
| 764 | |
| 765 | return mcs_get_gprs_by_num(bts_max_cs_dl(ms->bts)); |
| 766 | } |
| 767 | |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 768 | cs = mcs_get_egprs_by_num(bts_max_mcs_dl(ms->bts)); |
| 769 | if (ms_mode(ms) == EGPRS_GMSK && cs > MCS4) |
| 770 | cs = MCS4; |
| 771 | return cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 772 | } |
| 773 | |
| 774 | void ms_update_cs_ul(struct GprsMs *ms, const struct pcu_l1_meas *meas) |
| 775 | { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 776 | enum CodingScheme max_cs_ul = ms_max_cs_ul(ms); |
| 777 | |
| 778 | int old_link_qual; |
| 779 | int low; |
| 780 | int high; |
| 781 | enum CodingScheme new_cs_ul = ms->current_cs_ul; |
| 782 | uint8_t current_cs = mcs_chan_code(ms->current_cs_ul); |
| 783 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 784 | if (!max_cs_ul) { |
| 785 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 786 | "max_cs_ul cannot be derived (current UL CS: %s)\n", |
| 787 | mcs_name(ms->current_cs_ul)); |
| 788 | return; |
| 789 | } |
| 790 | |
| 791 | if (!ms->current_cs_ul) { |
| 792 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 793 | "Unable to update UL (M)CS because it's not set: %s\n", |
| 794 | mcs_name(ms->current_cs_ul)); |
| 795 | return; |
| 796 | } |
| 797 | |
| 798 | if (!meas->have_link_qual) { |
| 799 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 800 | "Unable to update UL (M)CS %s because we don't have link quality measurements.\n", |
| 801 | mcs_name(ms->current_cs_ul)); |
| 802 | return; |
| 803 | } |
| 804 | |
| 805 | if (mcs_is_gprs(ms->current_cs_ul)) { |
| 806 | if (current_cs >= MAX_GPRS_CS) |
| 807 | current_cs = MAX_GPRS_CS - 1; |
Pau Espin Pedrol | 54b159a | 2021-01-14 13:30:04 +0100 | [diff] [blame] | 808 | low = the_pcu->vty.cs_lqual_ranges[current_cs].low; |
| 809 | high = the_pcu->vty.cs_lqual_ranges[current_cs].high; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 810 | } else if (mcs_is_edge(ms->current_cs_ul)) { |
| 811 | if (current_cs >= MAX_EDGE_MCS) |
| 812 | current_cs = MAX_EDGE_MCS - 1; |
Pau Espin Pedrol | 54b159a | 2021-01-14 13:30:04 +0100 | [diff] [blame] | 813 | low = the_pcu->vty.mcs_lqual_ranges[current_cs].low; |
| 814 | high = the_pcu->vty.mcs_lqual_ranges[current_cs].high; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 815 | } else { |
| 816 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 817 | "Unable to update UL (M)CS because it's neither GPRS nor EDGE: %s\n", |
| 818 | mcs_name(ms->current_cs_ul)); |
| 819 | return; |
| 820 | } |
| 821 | |
| 822 | /* To avoid rapid changes of the coding scheme, we also take |
| 823 | * the old link quality value into account (if present). */ |
| 824 | if (ms->l1_meas.have_link_qual) |
| 825 | old_link_qual = ms->l1_meas.link_qual; |
| 826 | else |
| 827 | old_link_qual = meas->link_qual; |
| 828 | |
| 829 | if (meas->link_qual < low && old_link_qual < low) |
| 830 | mcs_dec_kind(&new_cs_ul, ms_mode(ms)); |
| 831 | else if (meas->link_qual > high && old_link_qual > high && |
| 832 | ms->current_cs_ul < max_cs_ul) |
| 833 | mcs_inc_kind(&new_cs_ul, ms_mode(ms)); |
| 834 | |
| 835 | if (ms->current_cs_ul != new_cs_ul) { |
| 836 | LOGPMS(ms, DRLCMACMEAS, LOGL_INFO, |
| 837 | "Link quality %ddB (old %ddB) left window [%d, %d], " |
| 838 | "modifying uplink CS level: %s -> %s\n", |
| 839 | meas->link_qual, old_link_qual, |
| 840 | low, high, |
| 841 | mcs_name(ms->current_cs_ul), mcs_name(new_cs_ul)); |
| 842 | |
| 843 | ms->current_cs_ul = new_cs_ul; |
| 844 | } |
| 845 | } |
| 846 | |
| 847 | void ms_update_l1_meas(struct GprsMs *ms, const struct pcu_l1_meas *meas) |
| 848 | { |
| 849 | unsigned i; |
| 850 | |
| 851 | ms_update_cs_ul(ms, meas); |
| 852 | |
| 853 | if (meas->have_rssi) |
| 854 | pcu_l1_meas_set_rssi(&ms->l1_meas, meas->rssi); |
| 855 | if (meas->have_bto) |
| 856 | pcu_l1_meas_set_bto(&ms->l1_meas, meas->bto); |
| 857 | if (meas->have_ber) |
| 858 | pcu_l1_meas_set_ber(&ms->l1_meas, meas->ber); |
| 859 | if (meas->have_link_qual) |
| 860 | pcu_l1_meas_set_link_qual(&ms->l1_meas, meas->link_qual); |
| 861 | |
| 862 | if (meas->have_ms_rx_qual) |
| 863 | pcu_l1_meas_set_ms_rx_qual(&ms->l1_meas, meas->ms_rx_qual); |
| 864 | if (meas->have_ms_c_value) |
| 865 | pcu_l1_meas_set_ms_c_value(&ms->l1_meas, meas->ms_c_value); |
| 866 | if (meas->have_ms_sign_var) |
| 867 | pcu_l1_meas_set_ms_sign_var(&ms->l1_meas, meas->ms_sign_var); |
| 868 | |
| 869 | if (meas->have_ms_i_level) { |
| 870 | for (i = 0; i < ARRAY_SIZE(meas->ts); ++i) { |
| 871 | if (meas->ts[i].have_ms_i_level) |
| 872 | pcu_l1_meas_set_ms_i_level(&ms->l1_meas, i, meas->ts[i].ms_i_level); |
| 873 | else |
| 874 | ms->l1_meas.ts[i].have_ms_i_level = 0; |
| 875 | } |
| 876 | } |
| 877 | } |
| 878 | |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 879 | /* req_mcs_kind acts as a set filter, where EGPRS means any and GPRS is the most restrictive */ |
| 880 | 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] | 881 | { |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 882 | enum CodingScheme orig_cs = ms->current_cs_dl; |
| 883 | struct gprs_rlcmac_bts *bts = ms->bts; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 884 | size_t unencoded_octets; |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 885 | enum CodingScheme cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 886 | |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 887 | /* It could be that a TBF requests a GPRS CS despite the MS currently |
| 888 | being upgraded to EGPRS (hence reporting MCS). That could happen |
| 889 | because the TBF was created early in the process where we didn't have |
| 890 | yet enough information about the MS, and only AFTER it was created we |
| 891 | upgraded the MS to be EGPRS capable. |
| 892 | As a result, when the MS is queried for the target CS here, we could be |
| 893 | returning an MCS despite the current TBF being established as GPRS, |
| 894 | but we rather stick to the TBF type we assigned to the MS rather than |
| 895 | magically sending EGPRS data blocks to a GPRS TBF. |
| 896 | It could also be that the caller requests specific MCS kind |
| 897 | explicitly too due to scheduling restrictions (GPRS+EGPRS multiplexing). */ |
| 898 | if (req_mcs_kind == EGPRS_GMSK && mcs_is_edge(orig_cs) && orig_cs > MCS4) { |
| 899 | cs = bts_cs_dl_is_supported(bts, MCS4) ? MCS4 : |
| 900 | bts_cs_dl_is_supported(bts, MCS3) ? MCS3 : |
| 901 | bts_cs_dl_is_supported(bts, MCS2) ? MCS2 : |
| 902 | MCS1; |
| 903 | } else if (req_mcs_kind == GPRS && mcs_is_edge(orig_cs)) { /* GPRS */ |
| 904 | int i; |
| 905 | cs = orig_cs > MCS4 ? MCS4 : orig_cs; |
| 906 | cs -= (MCS1 - CS1); /* MCSx -> CSx */ |
| 907 | /* Find suitable CS starting from equivalent MCS which is supported by BTS: */ |
| 908 | for (i = mcs_chan_code(cs); !bts_cs_dl_is_supported(bts, CS1 + i); i--); |
| 909 | OSMO_ASSERT(i >= 0 && i <= 3); /* CS1 is always supported */ |
| 910 | cs = CS1 + i; |
| 911 | } else { |
| 912 | cs = orig_cs; |
| 913 | } |
| 914 | |
| 915 | if (orig_cs != cs) |
| 916 | LOGPMS(ms, DRLCMACDL, LOGL_INFO, "MS (mode=%s) suggests transmitting " |
| 917 | "DL %s, downgrade to %s in order to match TBF & scheduler requirements\n", |
| 918 | 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] | 919 | |
| 920 | unencoded_octets = llc_queue_octets(&ms->llc_queue); |
| 921 | |
| 922 | /* If the DL TBF is active, add number of unencoded chunk octets */ |
| 923 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 924 | 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] | 925 | |
| 926 | /* There are many unencoded octets, don't reduce */ |
Pau Espin Pedrol | ad79b85 | 2021-01-14 13:20:55 +0100 | [diff] [blame] | 927 | if (unencoded_octets >= the_pcu->vty.cs_downgrade_threshold) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 928 | return cs; |
| 929 | |
| 930 | /* RF conditions are good, don't reduce */ |
Pau Espin Pedrol | e8dcf64 | 2021-01-14 13:17:01 +0100 | [diff] [blame] | 931 | 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] | 932 | return cs; |
| 933 | |
| 934 | /* The throughput would probably be better if the CS level was reduced */ |
| 935 | mcs_dec_kind(&cs, ms_mode(ms)); |
| 936 | |
| 937 | /* CS-2 doesn't gain throughput with small packets, further reduce to CS-1 */ |
| 938 | if (cs == CS2) |
| 939 | mcs_dec_kind(&cs, ms_mode(ms)); |
| 940 | |
| 941 | return cs; |
| 942 | } |
| 943 | |
Pau Espin Pedrol | 9935d0d | 2022-12-13 18:29:25 +0100 | [diff] [blame] | 944 | struct gprs_rlcmac_pdch *ms_first_common_ts(const struct GprsMs *ms) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 945 | { |
Pau Espin Pedrol | 345d9ad | 2022-12-12 19:22:44 +0100 | [diff] [blame] | 946 | return ms->first_common_ts; |
| 947 | } |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 948 | |
Pau Espin Pedrol | 9935d0d | 2022-12-13 18:29:25 +0100 | [diff] [blame] | 949 | void ms_set_first_common_ts(struct GprsMs *ms, struct gprs_rlcmac_pdch *pdch) |
Pau Espin Pedrol | 345d9ad | 2022-12-12 19:22:44 +0100 | [diff] [blame] | 950 | { |
Pau Espin Pedrol | 9935d0d | 2022-12-13 18:29:25 +0100 | [diff] [blame] | 951 | OSMO_ASSERT(pdch); |
| 952 | ms->first_common_ts = pdch; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 953 | } |
| 954 | |
| 955 | uint8_t ms_dl_slots(const struct GprsMs *ms) |
| 956 | { |
| 957 | uint8_t slots = 0; |
| 958 | |
| 959 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 960 | slots |= tbf_dl_slots(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 961 | |
| 962 | if (ms->ul_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 963 | slots |= tbf_dl_slots(ul_tbf_as_tbf(ms->ul_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 964 | |
| 965 | return slots; |
| 966 | } |
| 967 | |
| 968 | uint8_t ms_ul_slots(const struct GprsMs *ms) |
| 969 | { |
| 970 | uint8_t slots = 0; |
| 971 | |
| 972 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 973 | slots |= tbf_ul_slots(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 974 | |
| 975 | if (ms->ul_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 976 | slots |= tbf_ul_slots(ul_tbf_as_tbf(ms->ul_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 977 | |
| 978 | return slots; |
| 979 | } |
| 980 | |
| 981 | uint8_t ms_current_pacch_slots(const struct GprsMs *ms) |
| 982 | { |
| 983 | uint8_t slots = 0; |
| 984 | |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 985 | bool is_dl_active = ms->dl_tbf && tbf_is_tfi_assigned(dl_tbf_as_tbf(ms->dl_tbf)); |
| 986 | 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] | 987 | |
| 988 | if (!is_dl_active && !is_ul_active) |
| 989 | return 0; |
| 990 | |
| 991 | /* see TS 44.060, 8.1.1.2.2 */ |
| 992 | if (is_dl_active && !is_ul_active) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 993 | slots = tbf_dl_slots(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 994 | else if (!is_dl_active && is_ul_active) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 995 | slots = tbf_ul_slots(ul_tbf_as_tbf(ms->ul_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 996 | else |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 997 | slots = tbf_ul_slots(ul_tbf_as_tbf(ms->ul_tbf)) & |
| 998 | tbf_dl_slots(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 999 | |
| 1000 | /* Assume a multislot class 1 device */ |
| 1001 | /* TODO: For class 2 devices, this could be removed */ |
| 1002 | slots = pcu_lsb(slots); |
| 1003 | |
| 1004 | return slots; |
| 1005 | } |
| 1006 | |
| 1007 | void ms_set_reserved_slots(struct GprsMs *ms, struct gprs_rlcmac_trx *trx, |
| 1008 | uint8_t ul_slots, uint8_t dl_slots) |
| 1009 | { |
| 1010 | if (ms->current_trx) { |
| 1011 | bts_trx_unreserve_slots(ms->current_trx, GPRS_RLCMAC_DL_TBF, |
| 1012 | ms->reserved_dl_slots); |
| 1013 | bts_trx_unreserve_slots(ms->current_trx, GPRS_RLCMAC_UL_TBF, |
| 1014 | ms->reserved_ul_slots); |
| 1015 | ms->reserved_dl_slots = 0; |
| 1016 | ms->reserved_ul_slots = 0; |
| 1017 | } |
| 1018 | ms->current_trx = trx; |
| 1019 | if (trx) { |
| 1020 | ms->reserved_dl_slots = dl_slots; |
| 1021 | ms->reserved_ul_slots = ul_slots; |
| 1022 | bts_trx_reserve_slots(ms->current_trx, GPRS_RLCMAC_DL_TBF, |
| 1023 | ms->reserved_dl_slots); |
| 1024 | bts_trx_reserve_slots(ms->current_trx, GPRS_RLCMAC_UL_TBF, |
| 1025 | ms->reserved_ul_slots); |
| 1026 | } |
| 1027 | } |
| 1028 | |
| 1029 | struct gprs_rlcmac_tbf *ms_tbf(const struct GprsMs *ms, enum gprs_rlcmac_tbf_direction dir) |
| 1030 | { |
| 1031 | switch (dir) { |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 1032 | case GPRS_RLCMAC_DL_TBF: return dl_tbf_as_tbf(ms->dl_tbf); |
| 1033 | 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] | 1034 | } |
| 1035 | |
| 1036 | return NULL; |
| 1037 | } |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1038 | |
Pau Espin Pedrol | 3547d64 | 2022-10-21 15:00:08 +0200 | [diff] [blame] | 1039 | const char *ms_name(const struct GprsMs *ms) |
| 1040 | { |
| 1041 | static char _ms_name_buf[128]; |
| 1042 | return ms_name_buf(ms, _ms_name_buf, sizeof(_ms_name_buf)); |
| 1043 | } |
| 1044 | |
| 1045 | char *ms_name_buf(const struct GprsMs *ms, char *buf, unsigned int buf_size) |
| 1046 | { |
Pau Espin Pedrol | 94f8258 | 2022-11-03 14:16:17 +0100 | [diff] [blame] | 1047 | struct osmo_strbuf sb = { .buf = buf, .len = buf_size }; |
| 1048 | uint32_t tlli = ms_tlli(ms); |
| 1049 | |
| 1050 | OSMO_STRBUF_PRINTF(sb, "MS("); |
| 1051 | if (ms_imsi_is_valid(ms)) |
| 1052 | OSMO_STRBUF_PRINTF(sb, "IMSI-%s:", ms_imsi(ms)); |
| 1053 | if (tlli != GSM_RESERVED_TMSI) |
| 1054 | OSMO_STRBUF_PRINTF(sb, "TLLI-0x%08x:", tlli); |
| 1055 | OSMO_STRBUF_PRINTF(sb, "TA-%" PRIu8 ":MSCLS-%" PRIu8 "-%" PRIu8, |
| 1056 | ms_ta(ms), ms_ms_class(ms), ms_egprs_ms_class(ms)); |
| 1057 | if (ms->ul_tbf) |
| 1058 | OSMO_STRBUF_PRINTF(sb, ":UL"); |
| 1059 | if (ms->dl_tbf) |
| 1060 | OSMO_STRBUF_PRINTF(sb, ":DL"); |
| 1061 | |
| 1062 | OSMO_STRBUF_PRINTF(sb, ")"); |
Pau Espin Pedrol | 3547d64 | 2022-10-21 15:00:08 +0200 | [diff] [blame] | 1063 | return buf; |
| 1064 | } |
| 1065 | |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1066 | int ms_nacc_start(struct GprsMs *ms, Packet_Cell_Change_Notification_t *notif) |
| 1067 | { |
| 1068 | if (!ms->nacc) |
| 1069 | ms->nacc = nacc_fsm_alloc(ms); |
| 1070 | if (!ms->nacc) |
| 1071 | return -EINVAL; |
| 1072 | return osmo_fsm_inst_dispatch(ms->nacc->fi, NACC_EV_RX_CELL_CHG_NOTIFICATION, notif); |
| 1073 | } |
| 1074 | |
| 1075 | bool ms_nacc_rts(const struct GprsMs *ms) |
| 1076 | { |
| 1077 | if (!ms->nacc) |
| 1078 | return false; |
| 1079 | if (ms->nacc->fi->state == NACC_ST_TX_NEIGHBOUR_DATA || |
| 1080 | ms->nacc->fi->state == NACC_ST_TX_CELL_CHG_CONTINUE) |
| 1081 | return true; |
| 1082 | return false; |
| 1083 | } |
| 1084 | |
Pau Espin Pedrol | 5ba3ef9 | 2022-12-12 18:02:25 +0100 | [diff] [blame] | 1085 | struct msgb *ms_nacc_create_rlcmac_msg(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf, |
| 1086 | const struct gprs_rlcmac_pdch *pdch, uint32_t fn) |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1087 | { |
| 1088 | int rc; |
| 1089 | struct nacc_ev_create_rlcmac_msg_ctx data_ctx; |
| 1090 | |
Pau Espin Pedrol | 952cb3d | 2021-02-01 14:52:48 +0100 | [diff] [blame] | 1091 | data_ctx = (struct nacc_ev_create_rlcmac_msg_ctx) { |
| 1092 | .tbf = tbf, |
Pau Espin Pedrol | 5ba3ef9 | 2022-12-12 18:02:25 +0100 | [diff] [blame] | 1093 | .pdch = pdch, |
Pau Espin Pedrol | 952cb3d | 2021-02-01 14:52:48 +0100 | [diff] [blame] | 1094 | .fn = fn, |
Pau Espin Pedrol | 952cb3d | 2021-02-01 14:52:48 +0100 | [diff] [blame] | 1095 | .msg = NULL, |
| 1096 | }; |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1097 | |
| 1098 | rc = osmo_fsm_inst_dispatch(ms->nacc->fi, NACC_EV_CREATE_RLCMAC_MSG, &data_ctx); |
| 1099 | if (rc != 0 || !data_ctx.msg) |
| 1100 | return NULL; |
| 1101 | return data_ctx.msg; |
| 1102 | } |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1103 | |
| 1104 | static void ms_start_llc_timer(struct GprsMs *ms) |
| 1105 | { |
| 1106 | if (the_pcu->vty.llc_idle_ack_csec > 0) { |
| 1107 | struct timespec tv; |
| 1108 | csecs_to_timespec(the_pcu->vty.llc_idle_ack_csec, &tv); |
| 1109 | osmo_timer_schedule(&ms->llc_timer, tv.tv_sec, tv.tv_nsec / 1000); |
| 1110 | } |
| 1111 | } |
| 1112 | |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1113 | /* Can we get to send a DL TBF ass to the MS? */ |
| 1114 | static bool ms_is_reachable_for_dl_ass(const struct GprsMs *ms) |
| 1115 | { |
| 1116 | struct gprs_rlcmac_ul_tbf *ul_tbf = ms_ul_tbf(ms); |
| 1117 | |
| 1118 | /* This function assumes it is called when no DL TBF is present */ |
| 1119 | OSMO_ASSERT(!ms_dl_tbf(ms)); |
| 1120 | |
| 1121 | /* 3GPP TS 44.060 sec 7.1.3.1 Initiation of the Packet resource request procedure: |
| 1122 | * "Furthermore, the mobile station shall not respond to PACKET DOWNLINK ASSIGNMENT |
| 1123 | * or MULTIPLE TBF DOWNLINK ASSIGNMENT messages before contention resolution is |
| 1124 | * completed on the mobile station side." */ |
| 1125 | /* The possible uplink TBF is used to trigger downlink assignment: |
| 1126 | * - If there is no uplink TBF the MS is potentially in packet idle mode |
| 1127 | * and hence assignment will be done over CCCH (PCH) |
| 1128 | * - If there's an uplink TBF but it is finished (waiting for last PKT |
| 1129 | * CTRL ACK after sending last Pkt UL ACK/NACK with FINAL_ACK=1, then we |
| 1130 | * have no ways to contact the MS right now. Assignment will be delayed |
| 1131 | * until PKT CTRL ACK is received and the TBF is released at the MS side |
| 1132 | * (then assignment goes through PCH). |
| 1133 | */ |
| 1134 | if (!ul_tbf) |
| 1135 | return true; |
| 1136 | if (ul_tbf_contention_resolution_done(ul_tbf) && |
| 1137 | !tbf_ul_ack_waiting_cnf_final_ack(ul_tbf)) |
| 1138 | return true; |
| 1139 | |
| 1140 | return false; |
| 1141 | |
| 1142 | } |
| 1143 | |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1144 | /* Alloc a UL TBF to be assigned over PACCH. Called when an MS requests to |
| 1145 | * create a new UL TBF during the end of life of a previous UL TBF (or an SBA). |
| 1146 | * In summary, this TBF is allocated as a consequence of receiving a "Pkt |
| 1147 | * Resource Req" or "Pkt Ctrl Ack" from the MS. |
| 1148 | * See TS 44.060 9.3.2.4.2 "Non-extended uplink TBF mode". |
| 1149 | */ |
| 1150 | struct gprs_rlcmac_ul_tbf *ms_new_ul_tbf_assigned_pacch(struct GprsMs *ms, int8_t use_trx) |
| 1151 | { |
| 1152 | const bool single_slot = false; |
| 1153 | struct gprs_rlcmac_ul_tbf *ul_tbf; |
| 1154 | |
Pau Espin Pedrol | bda7bb7 | 2022-10-31 14:33:09 +0100 | [diff] [blame] | 1155 | 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] | 1156 | if (!ul_tbf) { |
| 1157 | LOGPMS(ms, DTBF, LOGL_NOTICE, "No PDCH resource\n"); |
| 1158 | /* Caller will most probably send a Imm Ass Reject after return */ |
| 1159 | return NULL; |
| 1160 | } |
| 1161 | osmo_fsm_inst_dispatch(tbf_state_fi(ul_tbf_as_tbf(ul_tbf)), TBF_EV_ASSIGN_ADD_PACCH, NULL); |
| 1162 | /* Contention resolution is considered to be done since TLLI is known in MS */ |
| 1163 | return ul_tbf; |
| 1164 | } |
| 1165 | |
| 1166 | /* Alloc a UL TBF to be assigned over AGCH. Used by request of a "One phase |
| 1167 | * packet access", where MS requested only 1 PDCH TS (TS 44.018 Table 9.1.8.1). */ |
| 1168 | struct gprs_rlcmac_ul_tbf *ms_new_ul_tbf_assigned_agch(struct GprsMs *ms) |
| 1169 | { |
| 1170 | const int8_t trx_no = -1; |
| 1171 | const bool single_slot = true; |
| 1172 | struct gprs_rlcmac_ul_tbf *ul_tbf; |
| 1173 | |
Pau Espin Pedrol | bda7bb7 | 2022-10-31 14:33:09 +0100 | [diff] [blame] | 1174 | 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] | 1175 | if (!ul_tbf) { |
| 1176 | LOGP(DTBF, LOGL_NOTICE, "No PDCH resource for Uplink TBF\n"); |
| 1177 | /* Caller will most probably send a Imm Ass Reject after return */ |
| 1178 | return NULL; |
| 1179 | } |
| 1180 | osmo_fsm_inst_dispatch(tbf_state_fi(ul_tbf_as_tbf(ul_tbf)), TBF_EV_ASSIGN_ADD_CCCH, NULL); |
| 1181 | return ul_tbf; |
| 1182 | } |
| 1183 | |
Pau Espin Pedrol | a621d59 | 2022-12-13 17:35:04 +0100 | [diff] [blame] | 1184 | /* Create a temporary dummy TBF to Tx a ImmAssReject if allocating a new one during |
| 1185 | * packet resource Request failed. This is similar as ul_tbf_alloc() but without |
| 1186 | * calling tbf->setup() (in charge of TFI/USF allocation), and reusing resources |
| 1187 | * from Packet Resource Request we received. See TS 44.060 sec 7.1.3.2.1 */ |
| 1188 | struct gprs_rlcmac_ul_tbf *ms_new_ul_tbf_rejected_pacch(struct GprsMs *ms, struct gprs_rlcmac_pdch *pdch) |
| 1189 | { |
| 1190 | struct gprs_rlcmac_ul_tbf *ul_tbf; |
| 1191 | ul_tbf = ul_tbf_alloc_rejected(ms->bts, ms, pdch); |
| 1192 | if (!ul_tbf) |
| 1193 | return NULL; |
| 1194 | osmo_fsm_inst_dispatch(tbf_state_fi(ul_tbf_as_tbf(ul_tbf)), TBF_EV_ASSIGN_ADD_PACCH, NULL); |
| 1195 | osmo_fsm_inst_dispatch(tbf_ul_ass_fi(ul_tbf_as_tbf(ul_tbf)), TBF_UL_ASS_EV_SCHED_ASS_REJ, NULL); |
| 1196 | |
| 1197 | return ul_tbf; |
| 1198 | } |
| 1199 | |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1200 | /* A new DL-TBF is allocated and assigned through PACCH using "tbf". |
| 1201 | * "tbf" may be either a UL-TBF or a DL-TBF. |
| 1202 | * Note: This should be called only when MS is reachable, see ms_is_reachable_for_dl_ass(). |
| 1203 | */ |
| 1204 | 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] | 1205 | { |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1206 | OSMO_ASSERT(tbf); |
| 1207 | const int8_t trx_no = tbf_get_trx(tbf)->trx_no; |
| 1208 | const bool single_slot = false; |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1209 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
| 1210 | |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1211 | dl_tbf = dl_tbf_alloc(ms->bts, ms, trx_no, single_slot); |
| 1212 | if (!dl_tbf) { |
| 1213 | LOGPMS(ms, DTBF, LOGL_NOTICE, "No PDCH resource\n"); |
| 1214 | return -EBUSY; |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1215 | } |
| 1216 | |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1217 | LOGPTBFDL(dl_tbf, LOGL_DEBUG, "[DOWNLINK] START (PACCH)\n"); |
| 1218 | dl_tbf_trigger_ass_on_pacch(dl_tbf, tbf); |
| 1219 | return 0; |
| 1220 | } |
| 1221 | |
| 1222 | /* A new DL-TBF is allocated and assigned through PCH. |
| 1223 | * Note: This should be called only when MS is reachable, see ms_is_reachable_for_dl_ass(). |
| 1224 | */ |
| 1225 | int ms_new_dl_tbf_assigned_on_pch(struct GprsMs *ms) |
| 1226 | { |
| 1227 | const int8_t trx_no = -1; |
| 1228 | const bool single_slot = true; |
| 1229 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
| 1230 | |
| 1231 | 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] | 1232 | if (!dl_tbf) { |
| 1233 | LOGPMS(ms, DTBF, LOGL_NOTICE, "No PDCH resource\n"); |
| 1234 | return -EBUSY; |
| 1235 | } |
| 1236 | |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1237 | LOGPTBFDL(dl_tbf, LOGL_DEBUG, "[DOWNLINK] START (PCH)\n"); |
| 1238 | dl_tbf_trigger_ass_on_pch(dl_tbf); |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1239 | return 0; |
| 1240 | } |
| 1241 | |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1242 | int ms_append_llc_dl_data(struct GprsMs *ms, uint16_t pdu_delay_csec, const uint8_t *data, uint16_t len) |
| 1243 | { |
| 1244 | struct timespec expire_time; |
| 1245 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1246 | int rc = 0; |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1247 | |
| 1248 | LOGPMS(ms, DTBFDL, LOGL_DEBUG, "appending %u bytes to DL LLC queue\n", len); |
| 1249 | |
| 1250 | struct msgb *llc_msg = msgb_alloc(len, "llc_pdu_queue"); |
| 1251 | if (!llc_msg) |
| 1252 | return -ENOMEM; |
| 1253 | |
| 1254 | llc_queue_calc_pdu_lifetime(ms->bts, pdu_delay_csec, &expire_time); |
| 1255 | memcpy(msgb_put(llc_msg, len), data, len); |
| 1256 | llc_queue_enqueue(ms_llc_queue(ms), llc_msg, &expire_time); |
| 1257 | ms_start_llc_timer(ms); |
| 1258 | |
| 1259 | dl_tbf = ms_dl_tbf(ms); |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1260 | if (dl_tbf) { |
| 1261 | if (tbf_state(dl_tbf_as_tbf_const(dl_tbf)) == TBF_ST_WAIT_RELEASE) { |
| 1262 | 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] | 1263 | 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] | 1264 | } |
| 1265 | } else { |
| 1266 | /* Check if we can create a DL TBF to start sending the enqueued |
| 1267 | * data. Otherwise it will be triggered later when it is reachable |
| 1268 | * again. */ |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1269 | if (ms_is_reachable_for_dl_ass(ms)) { |
| 1270 | if (ms_ul_tbf(ms)) |
| 1271 | rc = ms_new_dl_tbf_assigned_on_pacch(ms, ul_tbf_as_tbf(ms_ul_tbf(ms))); |
| 1272 | else |
| 1273 | rc = ms_new_dl_tbf_assigned_on_pch(ms); |
| 1274 | } |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1275 | } |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1276 | return rc; |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1277 | } |