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 | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 27 | #include "alloc_algo.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 | |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 65 | static void ms_becomes_idle(struct GprsMs *ms); |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame] | 66 | |
| 67 | static int ms_use_cb(struct osmo_use_count_entry *e, int32_t old_use_count, const char *file, int line) |
| 68 | { |
| 69 | struct GprsMs *ms = e->use_count->talloc_object; |
| 70 | int32_t total; |
| 71 | int level; |
| 72 | char buf[1024]; |
| 73 | |
| 74 | if (!e->use) |
| 75 | return -EINVAL; |
| 76 | |
| 77 | total = osmo_use_count_total(&ms->use_count); |
| 78 | |
| 79 | if (total == 0 |
| 80 | || (total == 1 && old_use_count == 0 && e->count == 1)) |
| 81 | level = LOGL_INFO; |
| 82 | else |
| 83 | level = LOGL_DEBUG; |
| 84 | |
| 85 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 86 | LOGPSRC(DMS, level, file, line, "%s: %s %s: now used by %s\n", |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame] | 87 | ms_name(ms), |
| 88 | (e->count - old_use_count) > 0 ? "+" : "-", e->use, |
| 89 | (osmo_use_count_to_str_buf(buf, sizeof(buf), &ms->use_count), buf)); |
| 90 | |
| 91 | if (e->count < 0) |
| 92 | return -ERANGE; |
| 93 | |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 94 | if (total == 0) { |
| 95 | OSMO_ASSERT(ms_is_idle(ms)); |
| 96 | ms_becomes_idle(ms); |
| 97 | } |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame] | 98 | return 0; |
| 99 | } |
| 100 | |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 101 | static void ms_release_timer_cb(void *data) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 102 | { |
| 103 | struct GprsMs *ms = (struct GprsMs *) data; |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 104 | LOGPMS(ms, DMS, LOGL_INFO, "Release timer expired\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 105 | |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 106 | /* Finally free the MS after being idle for a while according to config */ |
| 107 | talloc_free(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 108 | } |
| 109 | |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 110 | static void ms_llc_timer_cb(void *_ms) |
| 111 | { |
| 112 | struct GprsMs *ms = _ms; |
| 113 | struct gprs_rlcmac_dl_tbf *dl_tbf = ms_dl_tbf(ms); |
| 114 | |
| 115 | if (!dl_tbf) |
| 116 | return; |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 117 | 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] | 118 | return; |
| 119 | |
Pau Espin Pedrol | bd1f01f | 2022-10-27 15:19:39 +0200 | [diff] [blame] | 120 | 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] | 121 | |
Pau Espin Pedrol | 8fa3e06 | 2022-10-28 17:38:52 +0200 | [diff] [blame] | 122 | dl_tbf_request_dl_ack(dl_tbf); |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 123 | } |
| 124 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 125 | static int ms_talloc_destructor(struct GprsMs *ms); |
Pau Espin Pedrol | eae9147 | 2023-04-19 19:42:05 +0200 | [diff] [blame] | 126 | struct GprsMs *ms_alloc(struct gprs_rlcmac_bts *bts, const char *use_ref) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 127 | { |
| 128 | struct GprsMs *ms = talloc_zero(tall_pcu_ctx, struct GprsMs); |
Pau Espin Pedrol | b498746 | 2022-04-01 17:21:08 +0200 | [diff] [blame] | 129 | OSMO_ASSERT(bts); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 130 | |
| 131 | talloc_set_destructor(ms, ms_talloc_destructor); |
| 132 | |
Pau Espin Pedrol | fe7aee9 | 2023-04-17 18:23:56 +0200 | [diff] [blame] | 133 | llist_add(&ms->list, &bts->ms_list); |
Pau Espin Pedrol | 9da0686 | 2023-04-17 19:00:04 +0200 | [diff] [blame] | 134 | bts_stat_item_inc(bts, STAT_MS_PRESENT); |
Pau Espin Pedrol | fe7aee9 | 2023-04-17 18:23:56 +0200 | [diff] [blame] | 135 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 136 | ms->bts = bts; |
Pau Espin Pedrol | f80cc5b | 2023-04-17 14:25:51 +0200 | [diff] [blame] | 137 | ms->tlli = GSM_RESERVED_TMSI; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 138 | ms->new_ul_tlli = GSM_RESERVED_TMSI; |
| 139 | ms->new_dl_tlli = GSM_RESERVED_TMSI; |
| 140 | ms->ta = GSM48_TA_INVALID; |
| 141 | ms->current_cs_ul = UNKNOWN; |
| 142 | ms->current_cs_dl = UNKNOWN; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 143 | INIT_LLIST_HEAD(&ms->old_tbfs); |
| 144 | |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame] | 145 | ms->use_count = (struct osmo_use_count){ |
| 146 | .talloc_object = ms, |
| 147 | .use_cb = ms_use_cb, |
| 148 | }; |
| 149 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 150 | int codel_interval = LLC_CODEL_USE_DEFAULT; |
| 151 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 152 | LOGP(DMS, LOGL_INFO, "Creating MS object\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 153 | |
| 154 | ms->imsi[0] = '\0'; |
Pau Espin Pedrol | f086fed | 2023-04-20 16:52:40 +0200 | [diff] [blame] | 155 | osmo_timer_setup(&ms->release_timer, ms_release_timer_cb, ms); |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 156 | llc_queue_init(&ms->llc_queue, ms); |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 157 | memset(&ms->llc_timer, 0, sizeof(ms->llc_timer)); |
| 158 | osmo_timer_setup(&ms->llc_timer, ms_llc_timer_cb, ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 159 | |
| 160 | ms_set_mode(ms, GPRS); |
| 161 | |
Pau Espin Pedrol | b498746 | 2022-04-01 17:21:08 +0200 | [diff] [blame] | 162 | codel_interval = the_pcu->vty.llc_codel_interval_msec; |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 163 | if (codel_interval == LLC_CODEL_USE_DEFAULT) |
| 164 | codel_interval = GPRS_CODEL_SLOW_INTERVAL_MS; |
| 165 | llc_queue_set_codel_interval(&ms->llc_queue, codel_interval); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 166 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 167 | ms->last_cs_not_low = now_msec(); |
| 168 | ms->app_info_pending = false; |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 169 | |
| 170 | ms->ctrs = rate_ctr_group_alloc(ms, &ms_ctrg_desc, next_ms_ctr_group_id++); |
| 171 | if (!ms->ctrs) |
| 172 | goto free_ret; |
| 173 | |
Pau Espin Pedrol | eae9147 | 2023-04-19 19:42:05 +0200 | [diff] [blame] | 174 | if (use_ref) |
| 175 | ms_ref(ms, use_ref); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 176 | return ms; |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 177 | free_ret: |
| 178 | talloc_free(ms); |
| 179 | return NULL; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 180 | } |
| 181 | |
| 182 | static int ms_talloc_destructor(struct GprsMs *ms) |
| 183 | { |
| 184 | struct llist_item *pos, *tmp; |
| 185 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 186 | LOGPMS(ms, DMS, LOGL_INFO, "Destroying MS object\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 187 | |
Pau Espin Pedrol | 9da0686 | 2023-04-17 19:00:04 +0200 | [diff] [blame] | 188 | bts_stat_item_dec(ms->bts, STAT_MS_PRESENT); |
Pau Espin Pedrol | fe7aee9 | 2023-04-17 18:23:56 +0200 | [diff] [blame] | 189 | llist_del(&ms->list); |
| 190 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 191 | ms_set_reserved_slots(ms, NULL, 0, 0); |
| 192 | |
Pau Espin Pedrol | f086fed | 2023-04-20 16:52:40 +0200 | [diff] [blame] | 193 | osmo_timer_del(&ms->release_timer); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 194 | |
| 195 | if (ms->ul_tbf) { |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 196 | tbf_set_ms(ul_tbf_as_tbf(ms->ul_tbf), NULL); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 197 | ms->ul_tbf = NULL; |
| 198 | } |
| 199 | |
| 200 | if (ms->dl_tbf) { |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 201 | tbf_set_ms(dl_tbf_as_tbf(ms->dl_tbf), NULL); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 202 | ms->dl_tbf = NULL; |
| 203 | } |
| 204 | |
| 205 | llist_for_each_entry_safe(pos, tmp, &ms->old_tbfs, list) { |
| 206 | struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)pos->entry; |
| 207 | tbf_set_ms(tbf, NULL); |
| 208 | } |
| 209 | |
| 210 | llc_queue_clear(&ms->llc_queue, ms->bts); |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 211 | osmo_timer_del(&ms->llc_timer); |
Pau Espin Pedrol | bed48cc | 2021-01-11 17:32:18 +0100 | [diff] [blame] | 212 | |
| 213 | if (ms->ctrs) |
| 214 | rate_ctr_group_free(ms->ctrs); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 215 | return 0; |
| 216 | } |
| 217 | |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 218 | /* MS has no attached TBFs anymore. */ |
| 219 | static void ms_becomes_idle(struct GprsMs *ms) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 220 | { |
Pau Espin Pedrol | b53230a | 2023-04-20 16:42:54 +0200 | [diff] [blame] | 221 | unsigned long delay_rel_sec = osmo_tdef_get(ms->bts->pcu->T_defs, -2030, OSMO_TDEF_S, -1); |
| 222 | |
Pau Espin Pedrol | 4673eb0 | 2023-04-20 17:18:34 +0200 | [diff] [blame] | 223 | osmo_gettimeofday(&ms->tv_idle_start, NULL); |
| 224 | |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 225 | ms_set_reserved_slots(ms, NULL, 0, 0); |
| 226 | ms->first_common_ts = NULL; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 227 | |
Pau Espin Pedrol | 14379ef | 2023-04-17 20:43:26 +0200 | [diff] [blame] | 228 | /* Immediate free(): |
| 229 | * Skip delaying free() through release timer if delay is configured to be 0. |
| 230 | * This is useful for synced freed during unit tests. |
| 231 | */ |
Pau Espin Pedrol | b53230a | 2023-04-20 16:42:54 +0200 | [diff] [blame] | 232 | if (delay_rel_sec == 0) { |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 233 | talloc_free(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 234 | return; |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 235 | } |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 236 | |
Pau Espin Pedrol | 14379ef | 2023-04-17 20:43:26 +0200 | [diff] [blame] | 237 | /* Immediate free(): |
| 238 | * Skip delaying free() through release timer if TMSI is not |
| 239 | * known, since those cannot really be reused. |
| 240 | */ |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 241 | if (ms_tlli(ms) == GSM_RESERVED_TMSI) { |
| 242 | talloc_free(ms); |
Pau Espin Pedrol | 14379ef | 2023-04-17 20:43:26 +0200 | [diff] [blame] | 243 | return; |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame] | 244 | } |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 245 | |
Pau Espin Pedrol | b53230a | 2023-04-20 16:42:54 +0200 | [diff] [blame] | 246 | LOGPMS(ms, DMS, LOGL_INFO, "Schedule MS release in %lu secs\n", delay_rel_sec); |
Pau Espin Pedrol | f086fed | 2023-04-20 16:52:40 +0200 | [diff] [blame] | 247 | osmo_timer_schedule(&ms->release_timer, delay_rel_sec, 0); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 248 | } |
| 249 | |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 250 | static void ms_becomes_active(struct GprsMs *ms) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 251 | { |
Pau Espin Pedrol | f086fed | 2023-04-20 16:52:40 +0200 | [diff] [blame] | 252 | if (!osmo_timer_pending(&ms->release_timer)) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 253 | return; |
| 254 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 255 | LOGPMS(ms, DMS, LOGL_DEBUG, "Cancel scheduled MS release\n"); |
Pau Espin Pedrol | 4fe0901 | 2021-03-03 17:30:50 +0100 | [diff] [blame] | 256 | |
Pau Espin Pedrol | 4673eb0 | 2023-04-20 17:18:34 +0200 | [diff] [blame] | 257 | timerclear(&ms->tv_idle_start); |
Pau Espin Pedrol | f086fed | 2023-04-20 16:52:40 +0200 | [diff] [blame] | 258 | osmo_timer_del(&ms->release_timer); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 259 | } |
| 260 | |
| 261 | void ms_set_mode(struct GprsMs *ms, enum mcs_kind mode) |
| 262 | { |
| 263 | ms->mode = mode; |
| 264 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 265 | switch (ms->mode) { |
| 266 | case GPRS: |
| 267 | if (!mcs_is_gprs(ms->current_cs_ul)) { |
| 268 | ms->current_cs_ul = mcs_get_gprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 269 | ms->bts->initial_cs_ul); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 270 | if (!mcs_is_valid(ms->current_cs_ul)) |
| 271 | ms->current_cs_ul = CS1; |
| 272 | } |
| 273 | if (!mcs_is_gprs(ms->current_cs_dl)) { |
| 274 | ms->current_cs_dl = mcs_get_gprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 275 | ms->bts->initial_cs_dl); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 276 | if (!mcs_is_valid(ms->current_cs_dl)) |
| 277 | ms->current_cs_dl = CS1; |
| 278 | } |
| 279 | break; |
| 280 | |
| 281 | case EGPRS_GMSK: |
Pau Espin Pedrol | 7bb8cd6 | 2021-01-25 15:08:35 +0100 | [diff] [blame] | 282 | if (!mcs_is_edge_gmsk(ms->current_cs_ul)) { |
| 283 | ms->current_cs_ul = mcs_get_egprs_by_num( |
| 284 | ms->bts->initial_mcs_ul); |
| 285 | if (!mcs_is_valid(ms->current_cs_ul)) |
| 286 | ms->current_cs_ul = MCS1; |
| 287 | } |
| 288 | if (!mcs_is_edge_gmsk(ms->current_cs_dl)) { |
| 289 | ms->current_cs_dl = mcs_get_egprs_by_num( |
| 290 | ms->bts->initial_mcs_dl); |
| 291 | if (!mcs_is_valid(ms->current_cs_dl)) |
| 292 | ms->current_cs_dl = MCS1; |
| 293 | } |
| 294 | break; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 295 | case EGPRS: |
| 296 | if (!mcs_is_edge(ms->current_cs_ul)) { |
| 297 | ms->current_cs_ul = mcs_get_egprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 298 | ms->bts->initial_mcs_ul); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 299 | if (!mcs_is_valid(ms->current_cs_ul)) |
| 300 | ms->current_cs_ul = MCS1; |
| 301 | } |
| 302 | if (!mcs_is_edge(ms->current_cs_dl)) { |
| 303 | ms->current_cs_dl = mcs_get_egprs_by_num( |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 304 | ms->bts->initial_mcs_dl); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 305 | if (!mcs_is_valid(ms->current_cs_dl)) |
| 306 | ms->current_cs_dl = MCS1; |
| 307 | } |
| 308 | break; |
| 309 | } |
| 310 | } |
| 311 | |
Pau Espin Pedrol | 6efa381 | 2023-04-18 17:31:02 +0200 | [diff] [blame] | 312 | /* If a TBF is attached to an MS, it is either in ms->{dl,ul}_tbf or in ms->old_tbfs list */ |
| 313 | static bool ms_tbf_is_attached(const struct GprsMs *ms, const struct gprs_rlcmac_tbf *tbf) |
| 314 | { |
| 315 | const struct llist_item *pos; |
| 316 | OSMO_ASSERT(ms); |
| 317 | OSMO_ASSERT(tbf); |
| 318 | OSMO_ASSERT(tbf_ms(tbf) == ms); |
| 319 | |
| 320 | if (tbf == ul_tbf_as_tbf_const(ms->ul_tbf)) |
| 321 | return true; |
| 322 | |
| 323 | if (tbf == dl_tbf_as_tbf_const(ms->dl_tbf)) |
| 324 | return true; |
| 325 | |
| 326 | llist_for_each_entry(pos, &ms->old_tbfs, list) { |
| 327 | const struct gprs_rlcmac_tbf *tmp_tbf = (struct gprs_rlcmac_tbf *)pos->entry; |
| 328 | if (tmp_tbf == tbf) |
| 329 | return true; |
| 330 | } |
| 331 | return false; |
| 332 | } |
| 333 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 334 | static void ms_attach_ul_tbf(struct GprsMs *ms, struct gprs_rlcmac_ul_tbf *tbf) |
| 335 | { |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 336 | LOGPMS(ms, DMS, 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] | 337 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 338 | if (ms->ul_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 339 | 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] | 340 | |
| 341 | ms->ul_tbf = tbf; |
| 342 | |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 343 | ms_ref(ms, MS_USE_TBF); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | static void ms_attach_dl_tbf(struct GprsMs *ms, struct gprs_rlcmac_dl_tbf *tbf) |
| 347 | { |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 348 | LOGPMS(ms, DMS, 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] | 349 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 350 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 351 | 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] | 352 | |
| 353 | ms->dl_tbf = tbf; |
| 354 | |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 355 | ms_ref(ms, MS_USE_TBF); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | void ms_attach_tbf(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf) |
| 359 | { |
Pau Espin Pedrol | 3ea467d | 2023-04-18 16:33:34 +0200 | [diff] [blame] | 360 | OSMO_ASSERT(ms); |
| 361 | OSMO_ASSERT(tbf); |
Pau Espin Pedrol | 6efa381 | 2023-04-18 17:31:02 +0200 | [diff] [blame] | 362 | OSMO_ASSERT(!ms_tbf_is_attached(ms, tbf)); |
Pau Espin Pedrol | 3ea467d | 2023-04-18 16:33:34 +0200 | [diff] [blame] | 363 | |
Pau Espin Pedrol | b5fece9 | 2021-08-23 16:58:04 +0200 | [diff] [blame] | 364 | if (tbf_direction(tbf) == GPRS_RLCMAC_DL_TBF) |
Pau Espin Pedrol | cc30b05 | 2022-10-27 15:25:55 +0200 | [diff] [blame] | 365 | ms_attach_dl_tbf(ms, tbf_as_dl_tbf(tbf)); |
Pau Espin Pedrol | b5fece9 | 2021-08-23 16:58:04 +0200 | [diff] [blame] | 366 | else |
Pau Espin Pedrol | cc30b05 | 2022-10-27 15:25:55 +0200 | [diff] [blame] | 367 | ms_attach_ul_tbf(ms, tbf_as_ul_tbf(tbf)); |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 368 | |
| 369 | ms_becomes_active(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | void ms_detach_tbf(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf) |
| 373 | { |
Pau Espin Pedrol | 6efa381 | 2023-04-18 17:31:02 +0200 | [diff] [blame] | 374 | OSMO_ASSERT(tbf_ms(tbf) == ms); |
| 375 | |
| 376 | /* In general this should not happen, but it can happen if during TBF |
| 377 | * allocation something fails before tbf->setup() called ms_attach_tbf(). */ |
| 378 | if (!ms_tbf_is_attached(ms, tbf)) |
| 379 | return; |
| 380 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 381 | LOGPMS(ms, DMS, LOGL_INFO, "Detaching TBF: %s\n", |
Pau Espin Pedrol | df6684f | 2023-04-18 17:50:34 +0200 | [diff] [blame] | 382 | tbf_name(tbf)); |
| 383 | |
Pau Espin Pedrol | 6efa381 | 2023-04-18 17:31:02 +0200 | [diff] [blame] | 384 | if (tbf == ul_tbf_as_tbf(ms->ul_tbf)) { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 385 | ms->ul_tbf = NULL; |
Pau Espin Pedrol | 6efa381 | 2023-04-18 17:31:02 +0200 | [diff] [blame] | 386 | } else if (tbf == dl_tbf_as_tbf(ms->dl_tbf)) { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 387 | ms->dl_tbf = NULL; |
| 388 | } else { |
Pau Espin Pedrol | 6efa381 | 2023-04-18 17:31:02 +0200 | [diff] [blame] | 389 | /* We know from ms_tbf_is_attached()==true check above that tbf |
| 390 | * is in ms->old_tbfs, no need to look it up again. */ |
| 391 | llist_del(tbf_ms_list(tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 392 | } |
| 393 | |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 394 | ms_unref(ms, MS_USE_TBF); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 395 | } |
| 396 | |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 397 | /* Cleans up old MS being merged into a new one. Should be called with a |
| 398 | ms_ref() taken to avoid use-after-free. */ |
Pau Espin Pedrol | 5faedf3 | 2023-04-28 14:29:40 +0200 | [diff] [blame] | 399 | static void ms_reset(struct GprsMs *ms) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 400 | { |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 401 | LOGPMS(ms, DMS, LOGL_INFO, "Clearing MS object\n"); |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 402 | struct llist_item *pos; |
| 403 | struct gprs_rlcmac_tbf *tbf; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 404 | |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 405 | tbf = ul_tbf_as_tbf(ms_ul_tbf(ms)); |
| 406 | if (tbf && !tbf_timers_pending(tbf, T_MAX)) |
| 407 | tbf_free(tbf); |
| 408 | tbf = dl_tbf_as_tbf(ms_dl_tbf(ms)); |
| 409 | if (tbf && !tbf_timers_pending(tbf, T_MAX)) |
| 410 | tbf_free(tbf); |
| 411 | |
Pau Espin Pedrol | 7a491b9 | 2023-04-28 14:45:39 +0200 | [diff] [blame^] | 412 | while ((pos = llist_first_entry_or_null(&ms->old_tbfs, struct llist_item, list))) { |
Pau Espin Pedrol | ac4d4a6 | 2023-04-18 19:02:55 +0200 | [diff] [blame] | 413 | tbf = (struct gprs_rlcmac_tbf *)pos->entry; |
| 414 | if (!tbf_timers_pending(tbf, T_MAX)) |
| 415 | tbf_free(tbf); |
| 416 | } |
| 417 | |
| 418 | /* Flag it with invalid data so that it cannot be looked up anymore and |
Pau Espin Pedrol | b53230a | 2023-04-20 16:42:54 +0200 | [diff] [blame] | 419 | * shows up specially if listed in VTY. Furthermore, it will also trigger |
| 420 | * immediate free() when it becomes idle: */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 421 | ms->tlli = GSM_RESERVED_TMSI; |
| 422 | ms->new_dl_tlli = ms->tlli; |
| 423 | ms->new_ul_tlli = ms->tlli; |
| 424 | ms->imsi[0] = '\0'; |
| 425 | } |
| 426 | |
Pau Espin Pedrol | 8abe13c | 2022-10-21 18:49:48 +0200 | [diff] [blame] | 427 | /* This function should be called on the MS object of a TBF each time an RLCMAC |
| 428 | * block is received for it with TLLI information. |
| 429 | * Besides updating the TLLI field on the MS object, it also seeks for other MS |
| 430 | * objects in the store and merges them into the current MS object. The MS |
| 431 | * duplication happened because we don't learn the TLLI of the created TBF until |
| 432 | * a later point. */ |
| 433 | void ms_update_announced_tlli(struct GprsMs *ms, uint32_t tlli) |
| 434 | { |
| 435 | struct GprsMs *old_ms = NULL; |
| 436 | |
| 437 | if (tlli == GSM_RESERVED_TMSI) |
| 438 | return; |
| 439 | |
| 440 | /* When the TLLI does not match the ms, check if there is another |
| 441 | * MS object that belongs to that TLLI and if yes make sure one of them |
| 442 | * gets deleted. */ |
| 443 | if (!ms_check_tlli(ms, tlli)) |
Pau Espin Pedrol | eb0a052 | 2023-04-17 16:33:35 +0200 | [diff] [blame] | 444 | 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] | 445 | |
| 446 | ms_set_tlli(ms, tlli); |
| 447 | |
| 448 | if (old_ms) |
| 449 | ms_merge_and_clear_ms(ms, old_ms); |
| 450 | /* old_ms may no longer be available here */ |
| 451 | } |
| 452 | |
Pau Espin Pedrol | 32416fd | 2022-10-31 12:55:03 +0100 | [diff] [blame] | 453 | /* Merge 'old_ms' object into 'ms' object. |
| 454 | * 'old_ms' may be freed during the call to this function, don't use the pointer to it afterwards */ |
| 455 | 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] | 456 | { |
Pau Espin Pedrol | 32416fd | 2022-10-31 12:55:03 +0100 | [diff] [blame] | 457 | char old_ms_name[128]; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 458 | OSMO_ASSERT(old_ms != ms); |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame] | 459 | ms_ref(old_ms, __func__); |
Pau Espin Pedrol | 32416fd | 2022-10-31 12:55:03 +0100 | [diff] [blame] | 460 | |
| 461 | ms_name_buf(old_ms, old_ms_name, sizeof(old_ms_name)); |
| 462 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 463 | LOGPMS(ms, DMS, LOGL_INFO, "Merge MS: %s\n", old_ms_name); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 464 | |
| 465 | if (strlen(ms_imsi(ms)) == 0 && strlen(ms_imsi(old_ms)) != 0) |
| 466 | osmo_strlcpy(ms->imsi, ms_imsi(old_ms), sizeof(ms->imsi)); |
| 467 | |
| 468 | if (!ms_ms_class(ms) && ms_ms_class(old_ms)) |
| 469 | ms_set_ms_class(ms, ms_ms_class(old_ms)); |
| 470 | |
| 471 | if (!ms_egprs_ms_class(ms) && ms_egprs_ms_class(old_ms)) |
| 472 | ms_set_egprs_ms_class(ms, ms_egprs_ms_class(old_ms)); |
| 473 | |
| 474 | llc_queue_move_and_merge(&ms->llc_queue, &old_ms->llc_queue); |
| 475 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 476 | /* Clean up the old MS object */ |
Pau Espin Pedrol | 32416fd | 2022-10-31 12:55:03 +0100 | [diff] [blame] | 477 | ms_reset(old_ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 478 | |
Pau Espin Pedrol | 403e048 | 2023-04-17 20:28:10 +0200 | [diff] [blame] | 479 | ms_unref(old_ms, __func__); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 480 | } |
| 481 | |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 482 | /* Apply changes to the TLLI directly, used interally by functions below: */ |
| 483 | static void ms_apply_tlli_change(struct GprsMs *ms, uint32_t tlli) |
| 484 | { |
| 485 | ms->tlli = tlli; |
| 486 | ms->new_dl_tlli = GSM_RESERVED_TMSI; |
| 487 | ms->new_ul_tlli = GSM_RESERVED_TMSI; |
| 488 | |
| 489 | /* Update TBF FSM names: */ |
| 490 | if (ms->ul_tbf) |
| 491 | tbf_update_state_fsm_name(ul_tbf_as_tbf(ms->ul_tbf)); |
| 492 | if (ms->dl_tbf) |
| 493 | tbf_update_state_fsm_name(dl_tbf_as_tbf(ms->dl_tbf)); |
| 494 | } |
| 495 | |
Pau Espin Pedrol | 0b5997e | 2022-10-21 14:10:41 +0200 | [diff] [blame] | 496 | /* 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] | 497 | void ms_set_tlli(struct GprsMs *ms, uint32_t tlli) |
| 498 | { |
| 499 | if (tlli == ms->tlli || tlli == ms->new_ul_tlli) |
| 500 | return; |
| 501 | |
| 502 | if (tlli != ms->new_dl_tlli) { |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 503 | LOGP(DMS, LOGL_INFO, |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 504 | "Modifying MS object, UL TLLI: 0x%08x -> 0x%08x, " |
| 505 | "not yet confirmed\n", |
| 506 | ms_tlli(ms), tlli); |
| 507 | ms->new_ul_tlli = tlli; |
| 508 | return; |
| 509 | } |
| 510 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 511 | LOGP(DMS, LOGL_INFO, |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 512 | "Modifying MS object, TLLI: 0x%08x -> 0x%08x, " |
| 513 | "already confirmed partly\n", |
| 514 | ms->tlli, tlli); |
| 515 | |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 516 | ms_apply_tlli_change(ms, tlli); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 517 | } |
| 518 | |
Pau Espin Pedrol | 0b5997e | 2022-10-21 14:10:41 +0200 | [diff] [blame] | 519 | /* 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] | 520 | bool ms_confirm_tlli(struct GprsMs *ms, uint32_t tlli) |
| 521 | { |
| 522 | if (tlli == ms->tlli || tlli == ms->new_dl_tlli) |
| 523 | return false; |
| 524 | |
| 525 | if (tlli != ms->new_ul_tlli) { |
| 526 | /* The MS has not sent a message with the new TLLI, which may |
| 527 | * happen according to the spec [TODO: add reference]. */ |
| 528 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 529 | LOGP(DMS, LOGL_INFO, |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 530 | "The MS object cannot fully confirm an unexpected TLLI: 0x%08x, " |
| 531 | "partly confirmed\n", tlli); |
| 532 | /* Use the network's idea of TLLI as candidate, this does not |
| 533 | * change the result value of tlli() */ |
| 534 | ms->new_dl_tlli = tlli; |
| 535 | return false; |
| 536 | } |
| 537 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 538 | LOGP(DMS, LOGL_INFO, |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 539 | "Modifying MS object, TLLI: 0x%08x confirmed\n", tlli); |
| 540 | |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 541 | ms_apply_tlli_change(ms, tlli); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 542 | |
| 543 | return true; |
| 544 | } |
| 545 | |
| 546 | void ms_set_imsi(struct GprsMs *ms, const char *imsi) |
| 547 | { |
| 548 | if (!imsi) { |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 549 | LOGP(DMS, LOGL_ERROR, "Expected IMSI!\n"); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 550 | return; |
| 551 | } |
| 552 | |
| 553 | if (imsi[0] && strlen(imsi) < 3) { |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 554 | LOGP(DMS, LOGL_ERROR, "No valid IMSI '%s'!\n", |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 555 | imsi); |
| 556 | return; |
| 557 | } |
| 558 | |
| 559 | if (strcmp(imsi, ms->imsi) == 0) |
| 560 | return; |
| 561 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 562 | LOGP(DMS, LOGL_INFO, |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 563 | "Modifying MS object, TLLI = 0x%08x, IMSI '%s' -> '%s'\n", |
| 564 | ms_tlli(ms), ms->imsi, imsi); |
| 565 | |
Pau Espin Pedrol | cde18c5 | 2023-04-17 18:16:48 +0200 | [diff] [blame] | 566 | 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] | 567 | /* Check if we are going to store a different MS object with already |
| 568 | existing IMSI. This is probably a bug in code calling this function, |
| 569 | since it should take care of this explicitly */ |
| 570 | if (old_ms) { |
| 571 | /* We cannot find ms->ms by IMSI since we know that it has a |
| 572 | * different IMSI */ |
| 573 | OSMO_ASSERT(old_ms != ms); |
| 574 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 575 | LOGPMS(ms, DMS, LOGL_NOTICE, |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 576 | "IMSI '%s' was already assigned to another " |
| 577 | "MS object: TLLI = 0x%08x, that IMSI will be removed\n", |
| 578 | imsi, ms_tlli(old_ms)); |
| 579 | |
| 580 | ms_merge_and_clear_ms(ms, old_ms); |
Pau Espin Pedrol | b8ff74b | 2022-10-31 12:58:46 +0100 | [diff] [blame] | 581 | /* old_ms may no longer be available here */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 582 | } |
| 583 | |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 584 | /* Store the new IMSI: */ |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 585 | osmo_strlcpy(ms->imsi, imsi, sizeof(ms->imsi)); |
Pau Espin Pedrol | 57843c5 | 2022-11-03 13:35:19 +0100 | [diff] [blame] | 586 | |
| 587 | /* Update TBF FSM names: */ |
| 588 | if (ms->ul_tbf) |
| 589 | tbf_update_state_fsm_name(ul_tbf_as_tbf(ms->ul_tbf)); |
| 590 | if (ms->dl_tbf) |
| 591 | 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] | 592 | } |
| 593 | |
| 594 | void ms_set_ta(struct GprsMs *ms, uint8_t ta_) |
| 595 | { |
| 596 | if (ta_ == ms->ta) |
| 597 | return; |
| 598 | |
| 599 | if (gsm48_ta_is_valid(ta_)) { |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 600 | LOGP(DMS, LOGL_INFO, |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 601 | "Modifying MS object, TLLI = 0x%08x, TA %d -> %d\n", |
| 602 | ms_tlli(ms), ms->ta, ta_); |
| 603 | ms->ta = ta_; |
| 604 | } else |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 605 | LOGP(DMS, LOGL_NOTICE, |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 606 | "MS object, TLLI = 0x%08x, invalid TA %d rejected (old " |
| 607 | "value %d kept)\n", ms_tlli(ms), ta_, ms->ta); |
| 608 | } |
| 609 | |
| 610 | void ms_set_ms_class(struct GprsMs *ms, uint8_t ms_class_) |
| 611 | { |
| 612 | if (ms_class_ == ms->ms_class) |
| 613 | return; |
| 614 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 615 | LOGP(DMS, LOGL_INFO, |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 616 | "Modifying MS object, TLLI = 0x%08x, MS class %d -> %d\n", |
| 617 | ms_tlli(ms), ms->ms_class, ms_class_); |
| 618 | |
| 619 | ms->ms_class = ms_class_; |
| 620 | } |
| 621 | |
| 622 | void ms_set_egprs_ms_class(struct GprsMs *ms, uint8_t ms_class_) |
| 623 | { |
| 624 | if (ms_class_ == ms->egprs_ms_class) |
| 625 | return; |
| 626 | |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 627 | LOGP(DMS, LOGL_INFO, |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 628 | "Modifying MS object, TLLI = 0x%08x, EGPRS MS class %d -> %d\n", |
| 629 | ms_tlli(ms), ms->egprs_ms_class, ms_class_); |
| 630 | |
| 631 | ms->egprs_ms_class = ms_class_; |
| 632 | |
| 633 | if (!bts_max_mcs_ul(ms->bts) || !bts_max_mcs_dl(ms->bts)) { |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 634 | LOGPMS(ms, DMS, LOGL_DEBUG, |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 635 | "Avoid enabling EGPRS because use of MCS is disabled: ul=%u dl=%u\n", |
| 636 | bts_max_mcs_ul(ms->bts), bts_max_mcs_dl(ms->bts)); |
| 637 | return; |
| 638 | } |
| 639 | |
| 640 | if (mcs_is_edge_gmsk(mcs_get_egprs_by_num(bts_max_mcs_ul(ms->bts))) && |
| 641 | mcs_is_edge_gmsk(mcs_get_egprs_by_num(bts_max_mcs_dl(ms->bts))) && |
| 642 | ms_mode(ms) != EGPRS) |
| 643 | { |
| 644 | ms_set_mode(ms, EGPRS_GMSK); |
| 645 | } else { |
| 646 | ms_set_mode(ms, EGPRS); |
| 647 | } |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 648 | LOGPMS(ms, DMS, LOGL_INFO, "Enabled EGPRS, mode %s\n", mode_name(ms_mode(ms))); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | void ms_update_error_rate(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf, int error_rate) |
| 652 | { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 653 | int64_t now; |
| 654 | enum CodingScheme max_cs_dl = ms_max_cs_dl(ms); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 655 | OSMO_ASSERT(max_cs_dl); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 656 | |
| 657 | if (error_rate < 0) |
| 658 | return; |
| 659 | |
| 660 | now = now_msec(); |
| 661 | |
| 662 | /* TODO: Check for TBF direction */ |
| 663 | /* TODO: Support different CS values for UL and DL */ |
| 664 | |
| 665 | ms->nack_rate_dl = error_rate; |
| 666 | |
Pau Espin Pedrol | e8dcf64 | 2021-01-14 13:17:01 +0100 | [diff] [blame] | 667 | if (error_rate > the_pcu->vty.cs_adj_upper_limit) { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 668 | if (mcs_chan_code(ms->current_cs_dl) > 0) { |
| 669 | mcs_dec_kind(&ms->current_cs_dl, ms_mode(ms)); |
| 670 | LOGP(DRLCMACDL, LOGL_INFO, |
| 671 | "MS (IMSI %s): High error rate %d%%, " |
| 672 | "reducing CS level to %s\n", |
| 673 | ms_imsi(ms), error_rate, mcs_name(ms->current_cs_dl)); |
| 674 | ms->last_cs_not_low = now; |
| 675 | } |
Pau Espin Pedrol | e8dcf64 | 2021-01-14 13:17:01 +0100 | [diff] [blame] | 676 | } else if (error_rate < the_pcu->vty.cs_adj_lower_limit) { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 677 | if (ms->current_cs_dl < max_cs_dl) { |
| 678 | if (now - ms->last_cs_not_low > 1000) { |
| 679 | mcs_inc_kind(&ms->current_cs_dl, ms_mode(ms)); |
| 680 | |
| 681 | LOGP(DRLCMACDL, LOGL_INFO, |
| 682 | "MS (IMSI %s): Low error rate %d%%, " |
| 683 | "increasing DL CS level to %s\n", |
| 684 | ms_imsi(ms), error_rate, |
| 685 | mcs_name(ms->current_cs_dl)); |
| 686 | ms->last_cs_not_low = now; |
| 687 | } else { |
| 688 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 689 | "MS (IMSI %s): Low error rate %d%%, " |
| 690 | "ignored (within blocking period)\n", |
| 691 | ms_imsi(ms), error_rate); |
| 692 | } |
| 693 | } |
| 694 | } else { |
| 695 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 696 | "MS (IMSI %s): Medium error rate %d%%, ignored\n", |
| 697 | ms_imsi(ms), error_rate); |
| 698 | ms->last_cs_not_low = now; |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | enum CodingScheme ms_max_cs_ul(const struct GprsMs *ms) |
| 703 | { |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 704 | enum CodingScheme cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 705 | OSMO_ASSERT(ms->bts != NULL); |
| 706 | |
| 707 | if (mcs_is_gprs(ms->current_cs_ul)) { |
| 708 | if (!bts_max_cs_ul(ms->bts)) { |
| 709 | return CS4; |
| 710 | } |
| 711 | |
| 712 | return mcs_get_gprs_by_num(bts_max_cs_ul(ms->bts)); |
| 713 | } |
| 714 | |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 715 | cs = mcs_get_egprs_by_num(bts_max_mcs_ul(ms->bts)); |
| 716 | if (ms_mode(ms) == EGPRS_GMSK && cs > MCS4) |
| 717 | cs = MCS4; |
| 718 | return cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 719 | } |
| 720 | |
| 721 | void ms_set_current_cs_dl(struct GprsMs *ms, enum CodingScheme scheme) |
| 722 | { |
| 723 | ms->current_cs_dl = scheme; |
| 724 | } |
| 725 | |
| 726 | enum CodingScheme ms_max_cs_dl(const struct GprsMs *ms) |
| 727 | { |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 728 | enum CodingScheme cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 729 | OSMO_ASSERT(ms->bts != NULL); |
| 730 | |
| 731 | if (mcs_is_gprs(ms->current_cs_dl)) { |
| 732 | if (!bts_max_cs_dl(ms->bts)) { |
| 733 | return CS4; |
| 734 | } |
| 735 | |
| 736 | return mcs_get_gprs_by_num(bts_max_cs_dl(ms->bts)); |
| 737 | } |
| 738 | |
Pau Espin Pedrol | 201da4e | 2021-01-25 15:10:33 +0100 | [diff] [blame] | 739 | cs = mcs_get_egprs_by_num(bts_max_mcs_dl(ms->bts)); |
| 740 | if (ms_mode(ms) == EGPRS_GMSK && cs > MCS4) |
| 741 | cs = MCS4; |
| 742 | return cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 743 | } |
| 744 | |
| 745 | void ms_update_cs_ul(struct GprsMs *ms, const struct pcu_l1_meas *meas) |
| 746 | { |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 747 | enum CodingScheme max_cs_ul = ms_max_cs_ul(ms); |
| 748 | |
| 749 | int old_link_qual; |
| 750 | int low; |
| 751 | int high; |
| 752 | enum CodingScheme new_cs_ul = ms->current_cs_ul; |
| 753 | uint8_t current_cs = mcs_chan_code(ms->current_cs_ul); |
| 754 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 755 | if (!max_cs_ul) { |
| 756 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 757 | "max_cs_ul cannot be derived (current UL CS: %s)\n", |
| 758 | mcs_name(ms->current_cs_ul)); |
| 759 | return; |
| 760 | } |
| 761 | |
| 762 | if (!ms->current_cs_ul) { |
| 763 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 764 | "Unable to update UL (M)CS because it's not set: %s\n", |
| 765 | mcs_name(ms->current_cs_ul)); |
| 766 | return; |
| 767 | } |
| 768 | |
| 769 | if (!meas->have_link_qual) { |
| 770 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 771 | "Unable to update UL (M)CS %s because we don't have link quality measurements.\n", |
| 772 | mcs_name(ms->current_cs_ul)); |
| 773 | return; |
| 774 | } |
| 775 | |
| 776 | if (mcs_is_gprs(ms->current_cs_ul)) { |
| 777 | if (current_cs >= MAX_GPRS_CS) |
| 778 | current_cs = MAX_GPRS_CS - 1; |
Pau Espin Pedrol | 54b159a | 2021-01-14 13:30:04 +0100 | [diff] [blame] | 779 | low = the_pcu->vty.cs_lqual_ranges[current_cs].low; |
| 780 | high = the_pcu->vty.cs_lqual_ranges[current_cs].high; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 781 | } else if (mcs_is_edge(ms->current_cs_ul)) { |
| 782 | if (current_cs >= MAX_EDGE_MCS) |
| 783 | current_cs = MAX_EDGE_MCS - 1; |
Pau Espin Pedrol | 54b159a | 2021-01-14 13:30:04 +0100 | [diff] [blame] | 784 | low = the_pcu->vty.mcs_lqual_ranges[current_cs].low; |
| 785 | high = the_pcu->vty.mcs_lqual_ranges[current_cs].high; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 786 | } else { |
| 787 | LOGP(DRLCMACMEAS, LOGL_ERROR, |
| 788 | "Unable to update UL (M)CS because it's neither GPRS nor EDGE: %s\n", |
| 789 | mcs_name(ms->current_cs_ul)); |
| 790 | return; |
| 791 | } |
| 792 | |
| 793 | /* To avoid rapid changes of the coding scheme, we also take |
| 794 | * the old link quality value into account (if present). */ |
| 795 | if (ms->l1_meas.have_link_qual) |
| 796 | old_link_qual = ms->l1_meas.link_qual; |
| 797 | else |
| 798 | old_link_qual = meas->link_qual; |
| 799 | |
| 800 | if (meas->link_qual < low && old_link_qual < low) |
| 801 | mcs_dec_kind(&new_cs_ul, ms_mode(ms)); |
| 802 | else if (meas->link_qual > high && old_link_qual > high && |
| 803 | ms->current_cs_ul < max_cs_ul) |
| 804 | mcs_inc_kind(&new_cs_ul, ms_mode(ms)); |
| 805 | |
| 806 | if (ms->current_cs_ul != new_cs_ul) { |
| 807 | LOGPMS(ms, DRLCMACMEAS, LOGL_INFO, |
| 808 | "Link quality %ddB (old %ddB) left window [%d, %d], " |
| 809 | "modifying uplink CS level: %s -> %s\n", |
| 810 | meas->link_qual, old_link_qual, |
| 811 | low, high, |
| 812 | mcs_name(ms->current_cs_ul), mcs_name(new_cs_ul)); |
| 813 | |
| 814 | ms->current_cs_ul = new_cs_ul; |
| 815 | } |
| 816 | } |
| 817 | |
| 818 | void ms_update_l1_meas(struct GprsMs *ms, const struct pcu_l1_meas *meas) |
| 819 | { |
| 820 | unsigned i; |
| 821 | |
| 822 | ms_update_cs_ul(ms, meas); |
| 823 | |
| 824 | if (meas->have_rssi) |
| 825 | pcu_l1_meas_set_rssi(&ms->l1_meas, meas->rssi); |
| 826 | if (meas->have_bto) |
| 827 | pcu_l1_meas_set_bto(&ms->l1_meas, meas->bto); |
| 828 | if (meas->have_ber) |
| 829 | pcu_l1_meas_set_ber(&ms->l1_meas, meas->ber); |
| 830 | if (meas->have_link_qual) |
| 831 | pcu_l1_meas_set_link_qual(&ms->l1_meas, meas->link_qual); |
| 832 | |
| 833 | if (meas->have_ms_rx_qual) |
| 834 | pcu_l1_meas_set_ms_rx_qual(&ms->l1_meas, meas->ms_rx_qual); |
| 835 | if (meas->have_ms_c_value) |
| 836 | pcu_l1_meas_set_ms_c_value(&ms->l1_meas, meas->ms_c_value); |
| 837 | if (meas->have_ms_sign_var) |
| 838 | pcu_l1_meas_set_ms_sign_var(&ms->l1_meas, meas->ms_sign_var); |
| 839 | |
| 840 | if (meas->have_ms_i_level) { |
| 841 | for (i = 0; i < ARRAY_SIZE(meas->ts); ++i) { |
| 842 | if (meas->ts[i].have_ms_i_level) |
| 843 | pcu_l1_meas_set_ms_i_level(&ms->l1_meas, i, meas->ts[i].ms_i_level); |
| 844 | else |
| 845 | ms->l1_meas.ts[i].have_ms_i_level = 0; |
| 846 | } |
| 847 | } |
| 848 | } |
| 849 | |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 850 | /* req_mcs_kind acts as a set filter, where EGPRS means any and GPRS is the most restrictive */ |
| 851 | 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] | 852 | { |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 853 | enum CodingScheme orig_cs = ms->current_cs_dl; |
| 854 | struct gprs_rlcmac_bts *bts = ms->bts; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 855 | size_t unencoded_octets; |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 856 | enum CodingScheme cs; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 857 | |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 858 | /* It could be that a TBF requests a GPRS CS despite the MS currently |
| 859 | being upgraded to EGPRS (hence reporting MCS). That could happen |
| 860 | because the TBF was created early in the process where we didn't have |
| 861 | yet enough information about the MS, and only AFTER it was created we |
| 862 | upgraded the MS to be EGPRS capable. |
| 863 | As a result, when the MS is queried for the target CS here, we could be |
| 864 | returning an MCS despite the current TBF being established as GPRS, |
| 865 | but we rather stick to the TBF type we assigned to the MS rather than |
| 866 | magically sending EGPRS data blocks to a GPRS TBF. |
| 867 | It could also be that the caller requests specific MCS kind |
| 868 | explicitly too due to scheduling restrictions (GPRS+EGPRS multiplexing). */ |
| 869 | if (req_mcs_kind == EGPRS_GMSK && mcs_is_edge(orig_cs) && orig_cs > MCS4) { |
| 870 | cs = bts_cs_dl_is_supported(bts, MCS4) ? MCS4 : |
| 871 | bts_cs_dl_is_supported(bts, MCS3) ? MCS3 : |
| 872 | bts_cs_dl_is_supported(bts, MCS2) ? MCS2 : |
| 873 | MCS1; |
| 874 | } else if (req_mcs_kind == GPRS && mcs_is_edge(orig_cs)) { /* GPRS */ |
| 875 | int i; |
| 876 | cs = orig_cs > MCS4 ? MCS4 : orig_cs; |
| 877 | cs -= (MCS1 - CS1); /* MCSx -> CSx */ |
| 878 | /* Find suitable CS starting from equivalent MCS which is supported by BTS: */ |
| 879 | for (i = mcs_chan_code(cs); !bts_cs_dl_is_supported(bts, CS1 + i); i--); |
| 880 | OSMO_ASSERT(i >= 0 && i <= 3); /* CS1 is always supported */ |
| 881 | cs = CS1 + i; |
| 882 | } else { |
| 883 | cs = orig_cs; |
| 884 | } |
| 885 | |
| 886 | if (orig_cs != cs) |
Pau Espin Pedrol | fe4d2f7 | 2023-04-19 20:38:40 +0200 | [diff] [blame] | 887 | LOGPMS(ms, DMS, LOGL_INFO, "MS (mode=%s) suggests transmitting " |
Pau Espin Pedrol | fc46493 | 2021-01-25 12:05:32 +0100 | [diff] [blame] | 888 | "DL %s, downgrade to %s in order to match TBF & scheduler requirements\n", |
| 889 | 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] | 890 | |
| 891 | unencoded_octets = llc_queue_octets(&ms->llc_queue); |
| 892 | |
| 893 | /* If the DL TBF is active, add number of unencoded chunk octets */ |
| 894 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 895 | 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] | 896 | |
| 897 | /* There are many unencoded octets, don't reduce */ |
Pau Espin Pedrol | ad79b85 | 2021-01-14 13:20:55 +0100 | [diff] [blame] | 898 | if (unencoded_octets >= the_pcu->vty.cs_downgrade_threshold) |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 899 | return cs; |
| 900 | |
| 901 | /* RF conditions are good, don't reduce */ |
Pau Espin Pedrol | e8dcf64 | 2021-01-14 13:17:01 +0100 | [diff] [blame] | 902 | 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] | 903 | return cs; |
| 904 | |
| 905 | /* The throughput would probably be better if the CS level was reduced */ |
| 906 | mcs_dec_kind(&cs, ms_mode(ms)); |
| 907 | |
| 908 | /* CS-2 doesn't gain throughput with small packets, further reduce to CS-1 */ |
| 909 | if (cs == CS2) |
| 910 | mcs_dec_kind(&cs, ms_mode(ms)); |
| 911 | |
| 912 | return cs; |
| 913 | } |
| 914 | |
Pau Espin Pedrol | 9935d0d | 2022-12-13 18:29:25 +0100 | [diff] [blame] | 915 | 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] | 916 | { |
Pau Espin Pedrol | 345d9ad | 2022-12-12 19:22:44 +0100 | [diff] [blame] | 917 | return ms->first_common_ts; |
| 918 | } |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 919 | |
Pau Espin Pedrol | 9935d0d | 2022-12-13 18:29:25 +0100 | [diff] [blame] | 920 | 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] | 921 | { |
Pau Espin Pedrol | 9935d0d | 2022-12-13 18:29:25 +0100 | [diff] [blame] | 922 | OSMO_ASSERT(pdch); |
| 923 | ms->first_common_ts = pdch; |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 924 | } |
| 925 | |
| 926 | uint8_t ms_dl_slots(const struct GprsMs *ms) |
| 927 | { |
| 928 | uint8_t slots = 0; |
| 929 | |
| 930 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 931 | slots |= tbf_dl_slots(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 932 | |
| 933 | if (ms->ul_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 934 | slots |= tbf_dl_slots(ul_tbf_as_tbf(ms->ul_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 935 | |
| 936 | return slots; |
| 937 | } |
| 938 | |
| 939 | uint8_t ms_ul_slots(const struct GprsMs *ms) |
| 940 | { |
| 941 | uint8_t slots = 0; |
| 942 | |
| 943 | if (ms->dl_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 944 | slots |= tbf_ul_slots(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 945 | |
| 946 | if (ms->ul_tbf) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 947 | slots |= tbf_ul_slots(ul_tbf_as_tbf(ms->ul_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 948 | |
| 949 | return slots; |
| 950 | } |
| 951 | |
| 952 | uint8_t ms_current_pacch_slots(const struct GprsMs *ms) |
| 953 | { |
| 954 | uint8_t slots = 0; |
| 955 | |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 956 | bool is_dl_active = ms->dl_tbf && tbf_is_tfi_assigned(dl_tbf_as_tbf(ms->dl_tbf)); |
| 957 | 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] | 958 | |
| 959 | if (!is_dl_active && !is_ul_active) |
| 960 | return 0; |
| 961 | |
| 962 | /* see TS 44.060, 8.1.1.2.2 */ |
| 963 | if (is_dl_active && !is_ul_active) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 964 | slots = tbf_dl_slots(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 965 | else if (!is_dl_active && is_ul_active) |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 966 | slots = tbf_ul_slots(ul_tbf_as_tbf(ms->ul_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 967 | else |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 968 | slots = tbf_ul_slots(ul_tbf_as_tbf(ms->ul_tbf)) & |
| 969 | tbf_dl_slots(dl_tbf_as_tbf(ms->dl_tbf)); |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 970 | |
| 971 | /* Assume a multislot class 1 device */ |
| 972 | /* TODO: For class 2 devices, this could be removed */ |
| 973 | slots = pcu_lsb(slots); |
| 974 | |
| 975 | return slots; |
| 976 | } |
| 977 | |
| 978 | void ms_set_reserved_slots(struct GprsMs *ms, struct gprs_rlcmac_trx *trx, |
| 979 | uint8_t ul_slots, uint8_t dl_slots) |
| 980 | { |
| 981 | if (ms->current_trx) { |
| 982 | bts_trx_unreserve_slots(ms->current_trx, GPRS_RLCMAC_DL_TBF, |
| 983 | ms->reserved_dl_slots); |
| 984 | bts_trx_unreserve_slots(ms->current_trx, GPRS_RLCMAC_UL_TBF, |
| 985 | ms->reserved_ul_slots); |
| 986 | ms->reserved_dl_slots = 0; |
| 987 | ms->reserved_ul_slots = 0; |
| 988 | } |
| 989 | ms->current_trx = trx; |
| 990 | if (trx) { |
| 991 | ms->reserved_dl_slots = dl_slots; |
| 992 | ms->reserved_ul_slots = ul_slots; |
| 993 | bts_trx_reserve_slots(ms->current_trx, GPRS_RLCMAC_DL_TBF, |
| 994 | ms->reserved_dl_slots); |
| 995 | bts_trx_reserve_slots(ms->current_trx, GPRS_RLCMAC_UL_TBF, |
| 996 | ms->reserved_ul_slots); |
| 997 | } |
| 998 | } |
| 999 | |
| 1000 | struct gprs_rlcmac_tbf *ms_tbf(const struct GprsMs *ms, enum gprs_rlcmac_tbf_direction dir) |
| 1001 | { |
| 1002 | switch (dir) { |
Pau Espin Pedrol | 1e16e1d | 2022-10-27 15:40:20 +0200 | [diff] [blame] | 1003 | case GPRS_RLCMAC_DL_TBF: return dl_tbf_as_tbf(ms->dl_tbf); |
| 1004 | 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] | 1005 | } |
| 1006 | |
| 1007 | return NULL; |
| 1008 | } |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1009 | |
Pau Espin Pedrol | 3547d64 | 2022-10-21 15:00:08 +0200 | [diff] [blame] | 1010 | const char *ms_name(const struct GprsMs *ms) |
| 1011 | { |
| 1012 | static char _ms_name_buf[128]; |
| 1013 | return ms_name_buf(ms, _ms_name_buf, sizeof(_ms_name_buf)); |
| 1014 | } |
| 1015 | |
| 1016 | char *ms_name_buf(const struct GprsMs *ms, char *buf, unsigned int buf_size) |
| 1017 | { |
Pau Espin Pedrol | 94f8258 | 2022-11-03 14:16:17 +0100 | [diff] [blame] | 1018 | struct osmo_strbuf sb = { .buf = buf, .len = buf_size }; |
| 1019 | uint32_t tlli = ms_tlli(ms); |
| 1020 | |
| 1021 | OSMO_STRBUF_PRINTF(sb, "MS("); |
| 1022 | if (ms_imsi_is_valid(ms)) |
| 1023 | OSMO_STRBUF_PRINTF(sb, "IMSI-%s:", ms_imsi(ms)); |
| 1024 | if (tlli != GSM_RESERVED_TMSI) |
| 1025 | OSMO_STRBUF_PRINTF(sb, "TLLI-0x%08x:", tlli); |
| 1026 | OSMO_STRBUF_PRINTF(sb, "TA-%" PRIu8 ":MSCLS-%" PRIu8 "-%" PRIu8, |
| 1027 | ms_ta(ms), ms_ms_class(ms), ms_egprs_ms_class(ms)); |
| 1028 | if (ms->ul_tbf) |
| 1029 | OSMO_STRBUF_PRINTF(sb, ":UL"); |
| 1030 | if (ms->dl_tbf) |
| 1031 | OSMO_STRBUF_PRINTF(sb, ":DL"); |
| 1032 | |
| 1033 | OSMO_STRBUF_PRINTF(sb, ")"); |
Pau Espin Pedrol | 3547d64 | 2022-10-21 15:00:08 +0200 | [diff] [blame] | 1034 | return buf; |
| 1035 | } |
| 1036 | |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1037 | int ms_nacc_start(struct GprsMs *ms, Packet_Cell_Change_Notification_t *notif) |
| 1038 | { |
| 1039 | if (!ms->nacc) |
| 1040 | ms->nacc = nacc_fsm_alloc(ms); |
| 1041 | if (!ms->nacc) |
| 1042 | return -EINVAL; |
| 1043 | return osmo_fsm_inst_dispatch(ms->nacc->fi, NACC_EV_RX_CELL_CHG_NOTIFICATION, notif); |
| 1044 | } |
| 1045 | |
| 1046 | bool ms_nacc_rts(const struct GprsMs *ms) |
| 1047 | { |
| 1048 | if (!ms->nacc) |
| 1049 | return false; |
| 1050 | if (ms->nacc->fi->state == NACC_ST_TX_NEIGHBOUR_DATA || |
| 1051 | ms->nacc->fi->state == NACC_ST_TX_CELL_CHG_CONTINUE) |
| 1052 | return true; |
| 1053 | return false; |
| 1054 | } |
| 1055 | |
Pau Espin Pedrol | 5ba3ef9 | 2022-12-12 18:02:25 +0100 | [diff] [blame] | 1056 | struct msgb *ms_nacc_create_rlcmac_msg(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf, |
| 1057 | const struct gprs_rlcmac_pdch *pdch, uint32_t fn) |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1058 | { |
| 1059 | int rc; |
| 1060 | struct nacc_ev_create_rlcmac_msg_ctx data_ctx; |
| 1061 | |
Pau Espin Pedrol | 952cb3d | 2021-02-01 14:52:48 +0100 | [diff] [blame] | 1062 | data_ctx = (struct nacc_ev_create_rlcmac_msg_ctx) { |
| 1063 | .tbf = tbf, |
Pau Espin Pedrol | 5ba3ef9 | 2022-12-12 18:02:25 +0100 | [diff] [blame] | 1064 | .pdch = pdch, |
Pau Espin Pedrol | 952cb3d | 2021-02-01 14:52:48 +0100 | [diff] [blame] | 1065 | .fn = fn, |
Pau Espin Pedrol | 952cb3d | 2021-02-01 14:52:48 +0100 | [diff] [blame] | 1066 | .msg = NULL, |
| 1067 | }; |
Pau Espin Pedrol | c0a250d | 2021-01-21 18:46:13 +0100 | [diff] [blame] | 1068 | |
| 1069 | rc = osmo_fsm_inst_dispatch(ms->nacc->fi, NACC_EV_CREATE_RLCMAC_MSG, &data_ctx); |
| 1070 | if (rc != 0 || !data_ctx.msg) |
| 1071 | return NULL; |
| 1072 | return data_ctx.msg; |
| 1073 | } |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1074 | |
| 1075 | static void ms_start_llc_timer(struct GprsMs *ms) |
| 1076 | { |
| 1077 | if (the_pcu->vty.llc_idle_ack_csec > 0) { |
| 1078 | struct timespec tv; |
| 1079 | csecs_to_timespec(the_pcu->vty.llc_idle_ack_csec, &tv); |
| 1080 | osmo_timer_schedule(&ms->llc_timer, tv.tv_sec, tv.tv_nsec / 1000); |
| 1081 | } |
| 1082 | } |
| 1083 | |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1084 | /* Can we get to send a DL TBF ass to the MS? */ |
| 1085 | static bool ms_is_reachable_for_dl_ass(const struct GprsMs *ms) |
| 1086 | { |
| 1087 | struct gprs_rlcmac_ul_tbf *ul_tbf = ms_ul_tbf(ms); |
| 1088 | |
| 1089 | /* This function assumes it is called when no DL TBF is present */ |
| 1090 | OSMO_ASSERT(!ms_dl_tbf(ms)); |
| 1091 | |
| 1092 | /* 3GPP TS 44.060 sec 7.1.3.1 Initiation of the Packet resource request procedure: |
| 1093 | * "Furthermore, the mobile station shall not respond to PACKET DOWNLINK ASSIGNMENT |
| 1094 | * or MULTIPLE TBF DOWNLINK ASSIGNMENT messages before contention resolution is |
| 1095 | * completed on the mobile station side." */ |
| 1096 | /* The possible uplink TBF is used to trigger downlink assignment: |
| 1097 | * - If there is no uplink TBF the MS is potentially in packet idle mode |
| 1098 | * and hence assignment will be done over CCCH (PCH) |
| 1099 | * - If there's an uplink TBF but it is finished (waiting for last PKT |
| 1100 | * CTRL ACK after sending last Pkt UL ACK/NACK with FINAL_ACK=1, then we |
| 1101 | * have no ways to contact the MS right now. Assignment will be delayed |
| 1102 | * until PKT CTRL ACK is received and the TBF is released at the MS side |
| 1103 | * (then assignment goes through PCH). |
| 1104 | */ |
| 1105 | if (!ul_tbf) |
| 1106 | return true; |
| 1107 | if (ul_tbf_contention_resolution_done(ul_tbf) && |
| 1108 | !tbf_ul_ack_waiting_cnf_final_ack(ul_tbf)) |
| 1109 | return true; |
| 1110 | |
| 1111 | return false; |
| 1112 | |
| 1113 | } |
| 1114 | |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1115 | /* Alloc a UL TBF to be assigned over PACCH. Called when an MS requests to |
| 1116 | * create a new UL TBF during the end of life of a previous UL TBF (or an SBA). |
| 1117 | * In summary, this TBF is allocated as a consequence of receiving a "Pkt |
| 1118 | * Resource Req" or "Pkt Ctrl Ack" from the MS. |
| 1119 | * See TS 44.060 9.3.2.4.2 "Non-extended uplink TBF mode". |
| 1120 | */ |
| 1121 | struct gprs_rlcmac_ul_tbf *ms_new_ul_tbf_assigned_pacch(struct GprsMs *ms, int8_t use_trx) |
| 1122 | { |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1123 | struct gprs_rlcmac_ul_tbf *ul_tbf; |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1124 | const struct alloc_resources_req req = { |
| 1125 | .bts = ms->bts, |
| 1126 | .ms = ms, |
| 1127 | .direction = GPRS_RLCMAC_UL_TBF, |
| 1128 | .single = false, |
| 1129 | .use_trx = use_trx, |
| 1130 | }; |
| 1131 | struct alloc_resources_res res = {}; |
| 1132 | int rc; |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1133 | |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1134 | rc = the_pcu->alloc_algorithm(&req, &res); |
| 1135 | if (rc < 0) { |
| 1136 | LOGPMS(ms, DTBF, LOGL_NOTICE, |
| 1137 | "Timeslot Allocation failed: trx = %d, single_slot = %d\n", |
| 1138 | req.use_trx, req.single); |
| 1139 | bts_do_rate_ctr_inc(ms->bts, CTR_TBF_ALLOC_FAIL); |
| 1140 | return NULL; |
| 1141 | } |
| 1142 | |
| 1143 | ul_tbf = ul_tbf_alloc(ms->bts, ms); |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1144 | if (!ul_tbf) { |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1145 | LOGPMS(ms, DTBF, LOGL_NOTICE, "ul_tbf_alloc() failed\n"); |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1146 | /* Caller will most probably send a Imm Ass Reject after return */ |
| 1147 | return NULL; |
| 1148 | } |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1149 | |
| 1150 | /* Update MS, really allocate the resources */ |
| 1151 | if (res.reserved_ul_slots != ms_reserved_ul_slots(ms) || |
| 1152 | res.reserved_dl_slots != ms_reserved_dl_slots(ms)) { |
| 1153 | /* The reserved slots have changed, update the MS */ |
| 1154 | ms_set_reserved_slots(ms, res.trx, res.reserved_ul_slots, res.reserved_dl_slots); |
| 1155 | } |
| 1156 | ms_set_first_common_ts(ms, res.first_common_ts); |
| 1157 | |
| 1158 | /* Apply allocated resources to TBF: */ |
| 1159 | ul_tbf_apply_allocated_resources(ul_tbf, &res); |
| 1160 | |
| 1161 | ms_attach_tbf(ms, ul_tbf_as_tbf(ul_tbf)); |
| 1162 | |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1163 | osmo_fsm_inst_dispatch(tbf_state_fi(ul_tbf_as_tbf(ul_tbf)), TBF_EV_ASSIGN_ADD_PACCH, NULL); |
| 1164 | /* Contention resolution is considered to be done since TLLI is known in MS */ |
| 1165 | return ul_tbf; |
| 1166 | } |
| 1167 | |
| 1168 | /* Alloc a UL TBF to be assigned over AGCH. Used by request of a "One phase |
| 1169 | * packet access", where MS requested only 1 PDCH TS (TS 44.018 Table 9.1.8.1). */ |
| 1170 | struct gprs_rlcmac_ul_tbf *ms_new_ul_tbf_assigned_agch(struct GprsMs *ms) |
| 1171 | { |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1172 | struct gprs_rlcmac_ul_tbf *ul_tbf; |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1173 | const struct alloc_resources_req req = { |
| 1174 | .bts = ms->bts, |
| 1175 | .ms = ms, |
| 1176 | .direction = GPRS_RLCMAC_UL_TBF, |
| 1177 | .single = true, |
| 1178 | .use_trx = -1, |
| 1179 | }; |
| 1180 | struct alloc_resources_res res = {}; |
| 1181 | int rc; |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1182 | |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1183 | rc = the_pcu->alloc_algorithm(&req, &res); |
| 1184 | if (rc < 0) { |
| 1185 | LOGPMS(ms, DTBF, LOGL_NOTICE, |
| 1186 | "Timeslot Allocation failed: trx = %d, single_slot = %d\n", |
| 1187 | req.use_trx, req.single); |
| 1188 | bts_do_rate_ctr_inc(ms->bts, CTR_TBF_ALLOC_FAIL); |
| 1189 | return NULL; |
| 1190 | } |
| 1191 | |
| 1192 | ul_tbf = ul_tbf_alloc(ms->bts, ms); |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1193 | if (!ul_tbf) { |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1194 | LOGPMS(ms, DTBF, LOGL_NOTICE, "ul_tbf_alloc() failed\n"); |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1195 | /* Caller will most probably send a Imm Ass Reject after return */ |
| 1196 | return NULL; |
| 1197 | } |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1198 | |
| 1199 | /* Update MS, really allocate the resources */ |
| 1200 | if (res.reserved_ul_slots != ms_reserved_ul_slots(ms) || |
| 1201 | res.reserved_dl_slots != ms_reserved_dl_slots(ms)) { |
| 1202 | /* The reserved slots have changed, update the MS */ |
| 1203 | ms_set_reserved_slots(ms, res.trx, res.reserved_ul_slots, res.reserved_dl_slots); |
| 1204 | } |
| 1205 | ms_set_first_common_ts(ms, res.first_common_ts); |
| 1206 | |
| 1207 | /* Apply allocated resources to TBF: */ |
| 1208 | ul_tbf_apply_allocated_resources(ul_tbf, &res); |
| 1209 | |
| 1210 | ms_attach_tbf(ms, ul_tbf_as_tbf(ul_tbf)); |
| 1211 | |
Pau Espin Pedrol | 9438613 | 2022-10-28 19:50:09 +0200 | [diff] [blame] | 1212 | osmo_fsm_inst_dispatch(tbf_state_fi(ul_tbf_as_tbf(ul_tbf)), TBF_EV_ASSIGN_ADD_CCCH, NULL); |
| 1213 | return ul_tbf; |
| 1214 | } |
| 1215 | |
Pau Espin Pedrol | a621d59 | 2022-12-13 17:35:04 +0100 | [diff] [blame] | 1216 | /* Create a temporary dummy TBF to Tx a ImmAssReject if allocating a new one during |
| 1217 | * packet resource Request failed. This is similar as ul_tbf_alloc() but without |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1218 | * calling alloc_algo (in charge of TFI/USF allocation), and reusing resources |
Pau Espin Pedrol | a621d59 | 2022-12-13 17:35:04 +0100 | [diff] [blame] | 1219 | * from Packet Resource Request we received. See TS 44.060 sec 7.1.3.2.1 */ |
| 1220 | struct gprs_rlcmac_ul_tbf *ms_new_ul_tbf_rejected_pacch(struct GprsMs *ms, struct gprs_rlcmac_pdch *pdch) |
| 1221 | { |
| 1222 | struct gprs_rlcmac_ul_tbf *ul_tbf; |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1223 | struct alloc_resources_res fake_res = { |
| 1224 | .trx = pdch->trx, |
| 1225 | .first_common_ts = pdch, |
| 1226 | .reserved_ul_slots = 0, |
| 1227 | .reserved_dl_slots = 0, |
| 1228 | .ass_slots_mask = 0, |
| 1229 | .upgrade_to_multislot = false, |
| 1230 | .tfi = TBF_TFI_UNSET, |
| 1231 | .usf = {0}, |
| 1232 | }; |
| 1233 | ul_tbf = ul_tbf_alloc(ms->bts, ms); |
Pau Espin Pedrol | a621d59 | 2022-12-13 17:35:04 +0100 | [diff] [blame] | 1234 | if (!ul_tbf) |
| 1235 | return NULL; |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1236 | |
| 1237 | /* The only one TS is the common, control TS */ |
| 1238 | ms_set_first_common_ts(ms, pdch); |
| 1239 | |
| 1240 | /* Apply fake resources to TBF, to attach it to the proper TRX/PDCH: */ |
| 1241 | ul_tbf_apply_allocated_resources(ul_tbf, &fake_res); |
| 1242 | |
| 1243 | ms_attach_tbf(ms, ul_tbf_as_tbf(ul_tbf)); |
| 1244 | |
Pau Espin Pedrol | a621d59 | 2022-12-13 17:35:04 +0100 | [diff] [blame] | 1245 | osmo_fsm_inst_dispatch(tbf_state_fi(ul_tbf_as_tbf(ul_tbf)), TBF_EV_ASSIGN_ADD_PACCH, NULL); |
| 1246 | osmo_fsm_inst_dispatch(tbf_ul_ass_fi(ul_tbf_as_tbf(ul_tbf)), TBF_UL_ASS_EV_SCHED_ASS_REJ, NULL); |
| 1247 | |
| 1248 | return ul_tbf; |
| 1249 | } |
| 1250 | |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1251 | /* A new DL-TBF is allocated and assigned through PACCH using "tbf". |
| 1252 | * "tbf" may be either a UL-TBF or a DL-TBF. |
| 1253 | * Note: This should be called only when MS is reachable, see ms_is_reachable_for_dl_ass(). |
| 1254 | */ |
| 1255 | 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] | 1256 | { |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1257 | OSMO_ASSERT(tbf); |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1258 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1259 | const struct alloc_resources_req req = { |
| 1260 | .bts = ms->bts, |
| 1261 | .ms = ms, |
| 1262 | .direction = GPRS_RLCMAC_DL_TBF, |
| 1263 | .single = false, |
| 1264 | .use_trx = tbf_get_trx(tbf)->trx_no, |
| 1265 | }; |
| 1266 | struct alloc_resources_res res = {}; |
| 1267 | int rc; |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1268 | |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1269 | rc = the_pcu->alloc_algorithm(&req, &res); |
| 1270 | if (rc < 0) { |
| 1271 | LOGPMS(ms, DTBF, LOGL_NOTICE, |
| 1272 | "Timeslot Allocation failed: trx = %d, single_slot = %d\n", |
| 1273 | req.use_trx, req.single); |
| 1274 | bts_do_rate_ctr_inc(ms->bts, CTR_TBF_ALLOC_FAIL); |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1275 | return -EBUSY; |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1276 | } |
| 1277 | |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1278 | dl_tbf = dl_tbf_alloc(ms->bts, ms); |
| 1279 | if (!dl_tbf) { |
| 1280 | LOGPMS(ms, DTBF, LOGL_NOTICE, "dl_tbf_alloc() failed\n"); |
| 1281 | return -1; |
| 1282 | } |
| 1283 | |
| 1284 | /* Update MS, really allocate the resources */ |
| 1285 | if (res.reserved_ul_slots != ms_reserved_ul_slots(ms) || |
| 1286 | res.reserved_dl_slots != ms_reserved_dl_slots(ms)) { |
| 1287 | /* The reserved slots have changed, update the MS */ |
| 1288 | ms_set_reserved_slots(ms, res.trx, res.reserved_ul_slots, res.reserved_dl_slots); |
| 1289 | } |
| 1290 | ms_set_first_common_ts(ms, res.first_common_ts); |
| 1291 | |
| 1292 | /* Apply allocated resources to TBF: */ |
| 1293 | dl_tbf_apply_allocated_resources(dl_tbf, &res); |
| 1294 | |
| 1295 | ms_attach_tbf(ms, dl_tbf_as_tbf(dl_tbf)); |
| 1296 | |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1297 | LOGPTBFDL(dl_tbf, LOGL_DEBUG, "[DOWNLINK] START (PACCH)\n"); |
| 1298 | dl_tbf_trigger_ass_on_pacch(dl_tbf, tbf); |
| 1299 | return 0; |
| 1300 | } |
| 1301 | |
| 1302 | /* A new DL-TBF is allocated and assigned through PCH. |
| 1303 | * Note: This should be called only when MS is reachable, see ms_is_reachable_for_dl_ass(). |
| 1304 | */ |
| 1305 | int ms_new_dl_tbf_assigned_on_pch(struct GprsMs *ms) |
| 1306 | { |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1307 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1308 | const struct alloc_resources_req req = { |
| 1309 | .bts = ms->bts, |
| 1310 | .ms = ms, |
| 1311 | .direction = GPRS_RLCMAC_DL_TBF, |
| 1312 | .single = true, |
| 1313 | .use_trx = -1, |
| 1314 | }; |
| 1315 | struct alloc_resources_res res = {}; |
| 1316 | int rc; |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1317 | |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1318 | rc = the_pcu->alloc_algorithm(&req, &res); |
| 1319 | if (rc < 0) { |
| 1320 | LOGPMS(ms, DTBF, LOGL_NOTICE, |
| 1321 | "Timeslot Allocation failed: trx = %d, single_slot = %d\n", |
| 1322 | req.use_trx, req.single); |
| 1323 | bts_do_rate_ctr_inc(ms->bts, CTR_TBF_ALLOC_FAIL); |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1324 | return -EBUSY; |
| 1325 | } |
| 1326 | |
Pau Espin Pedrol | 4d36391 | 2023-04-21 19:32:16 +0200 | [diff] [blame] | 1327 | dl_tbf = dl_tbf_alloc(ms->bts, ms); |
| 1328 | if (!dl_tbf) { |
| 1329 | LOGPMS(ms, DTBF, LOGL_NOTICE, "dl_tbf_alloc() failed\n"); |
| 1330 | return -1; |
| 1331 | } |
| 1332 | |
| 1333 | /* Update MS, really allocate the resources */ |
| 1334 | if (res.reserved_ul_slots != ms_reserved_ul_slots(ms) || |
| 1335 | res.reserved_dl_slots != ms_reserved_dl_slots(ms)) { |
| 1336 | /* The reserved slots have changed, update the MS */ |
| 1337 | ms_set_reserved_slots(ms, res.trx, res.reserved_ul_slots, res.reserved_dl_slots); |
| 1338 | } |
| 1339 | ms_set_first_common_ts(ms, res.first_common_ts); |
| 1340 | |
| 1341 | /* Apply allocated resources to TBF: */ |
| 1342 | dl_tbf_apply_allocated_resources(dl_tbf, &res); |
| 1343 | |
| 1344 | ms_attach_tbf(ms, dl_tbf_as_tbf(dl_tbf)); |
| 1345 | |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1346 | LOGPTBFDL(dl_tbf, LOGL_DEBUG, "[DOWNLINK] START (PCH)\n"); |
| 1347 | dl_tbf_trigger_ass_on_pch(dl_tbf); |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1348 | return 0; |
| 1349 | } |
| 1350 | |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1351 | int ms_append_llc_dl_data(struct GprsMs *ms, uint16_t pdu_delay_csec, const uint8_t *data, uint16_t len) |
| 1352 | { |
| 1353 | struct timespec expire_time; |
| 1354 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1355 | int rc = 0; |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1356 | |
| 1357 | LOGPMS(ms, DTBFDL, LOGL_DEBUG, "appending %u bytes to DL LLC queue\n", len); |
| 1358 | |
| 1359 | struct msgb *llc_msg = msgb_alloc(len, "llc_pdu_queue"); |
| 1360 | if (!llc_msg) |
| 1361 | return -ENOMEM; |
| 1362 | |
| 1363 | llc_queue_calc_pdu_lifetime(ms->bts, pdu_delay_csec, &expire_time); |
| 1364 | memcpy(msgb_put(llc_msg, len), data, len); |
| 1365 | llc_queue_enqueue(ms_llc_queue(ms), llc_msg, &expire_time); |
| 1366 | ms_start_llc_timer(ms); |
| 1367 | |
| 1368 | dl_tbf = ms_dl_tbf(ms); |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1369 | if (dl_tbf) { |
| 1370 | if (tbf_state(dl_tbf_as_tbf_const(dl_tbf)) == TBF_ST_WAIT_RELEASE) { |
| 1371 | 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] | 1372 | 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] | 1373 | } |
| 1374 | } else { |
| 1375 | /* Check if we can create a DL TBF to start sending the enqueued |
| 1376 | * data. Otherwise it will be triggered later when it is reachable |
Pau Espin Pedrol | 84b0ebc | 2023-04-19 18:45:21 +0200 | [diff] [blame] | 1377 | * again. */ |
Pau Espin Pedrol | 091642a | 2022-10-28 18:01:31 +0200 | [diff] [blame] | 1378 | if (ms_is_reachable_for_dl_ass(ms)) { |
| 1379 | if (ms_ul_tbf(ms)) |
| 1380 | rc = ms_new_dl_tbf_assigned_on_pacch(ms, ul_tbf_as_tbf(ms_ul_tbf(ms))); |
| 1381 | else |
| 1382 | rc = ms_new_dl_tbf_assigned_on_pch(ms); |
| 1383 | } |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1384 | } |
Pau Espin Pedrol | 22b26d8 | 2022-10-26 15:44:14 +0200 | [diff] [blame] | 1385 | return rc; |
Pau Espin Pedrol | 14beef6 | 2022-10-26 19:44:07 +0200 | [diff] [blame] | 1386 | } |