Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 1 | /* tbf_dl_fsm.c |
| 2 | * |
| 3 | * Copyright (C) 2021-2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> |
| 4 | * Author: Pau Espin Pedrol <pespin@sysmocom.de> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version 2 |
| 9 | * of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | */ |
| 16 | |
| 17 | #include <unistd.h> |
| 18 | |
| 19 | #include <talloc.h> |
| 20 | |
| 21 | #include <tbf_fsm.h> |
| 22 | #include <gprs_rlcmac.h> |
| 23 | #include <gprs_debug.h> |
| 24 | #include <gprs_ms.h> |
| 25 | #include <encoding.h> |
| 26 | #include <bts.h> |
| 27 | |
| 28 | #include <bts_pch_timer.h> |
| 29 | |
| 30 | #define X(s) (1 << (s)) |
| 31 | |
Pau Espin Pedrol | 76ef666 | 2023-01-27 13:19:55 +0100 | [diff] [blame] | 32 | static const struct osmo_tdef_state_timeout tbf_dl_fsm_timeouts[32] = { |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 33 | [TBF_ST_NEW] = {}, |
| 34 | [TBF_ST_ASSIGN] = { }, |
| 35 | [TBF_ST_FLOW] = { }, |
| 36 | [TBF_ST_FINISHED] = {}, |
| 37 | [TBF_ST_WAIT_RELEASE] = {}, |
| 38 | [TBF_ST_RELEASING] = {}, |
| 39 | }; |
| 40 | |
| 41 | /* Transition to a state, using the T timer defined in tbf_fsm_timeouts. |
| 42 | * The actual timeout value is in turn obtained from conn->T_defs. |
| 43 | * Assumes local variable fi exists. */ |
| 44 | #define tbf_dl_fsm_state_chg(fi, NEXT_STATE) \ |
| 45 | osmo_tdef_fsm_inst_state_chg(fi, NEXT_STATE, \ |
| 46 | tbf_dl_fsm_timeouts, \ |
| 47 | the_pcu->T_defs, \ |
| 48 | -1) |
| 49 | |
| 50 | static void mod_ass_type(struct tbf_dl_fsm_ctx *ctx, uint8_t t, bool set) |
| 51 | { |
| 52 | const char *ch = "UNKNOWN"; |
| 53 | bool prev_set = ctx->state_flags & (1 << t); |
| 54 | |
| 55 | switch (t) { |
| 56 | case GPRS_RLCMAC_FLAG_CCCH: |
| 57 | ch = "CCCH"; |
| 58 | break; |
| 59 | case GPRS_RLCMAC_FLAG_PACCH: |
| 60 | ch = "PACCH"; |
| 61 | break; |
| 62 | default: |
Pau Espin Pedrol | 83a0892 | 2022-12-12 19:46:01 +0100 | [diff] [blame] | 63 | LOGPTBFDL(ctx->dl_tbf, LOGL_ERROR, |
| 64 | "attempted to %sset unexpected ass. type %d - FIXME!\n", |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 65 | set ? "" : "un", t); |
| 66 | return; |
| 67 | } |
| 68 | |
| 69 | if (set && prev_set) |
Pau Espin Pedrol | 83a0892 | 2022-12-12 19:46:01 +0100 | [diff] [blame] | 70 | LOGPTBFDL(ctx->dl_tbf, LOGL_ERROR, |
| 71 | "attempted to set ass. type %s which is already set.\n", ch); |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 72 | else if (!set && !prev_set) |
| 73 | return; |
| 74 | |
Pau Espin Pedrol | 83a0892 | 2022-12-12 19:46:01 +0100 | [diff] [blame] | 75 | LOGPTBFDL(ctx->dl_tbf, LOGL_INFO, "%sset ass. type %s [prev CCCH:%u, PACCH:%u]\n", |
| 76 | set ? "" : "un", ch, |
| 77 | !!(ctx->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)), |
| 78 | !!(ctx->state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))); |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 79 | |
| 80 | if (set) { |
| 81 | ctx->state_flags |= (1 << t); |
| 82 | } else { |
| 83 | ctx->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; /* keep to flags */ |
| 84 | ctx->state_flags &= ~(1 << t); |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | |
| 89 | static void st_new(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 90 | { |
| 91 | struct tbf_dl_fsm_ctx *ctx = (struct tbf_dl_fsm_ctx *)fi->priv; |
| 92 | switch (event) { |
| 93 | case TBF_EV_ASSIGN_ADD_CCCH: |
| 94 | mod_ass_type(ctx, GPRS_RLCMAC_FLAG_CCCH, true); |
| 95 | tbf_dl_fsm_state_chg(fi, TBF_ST_ASSIGN); |
| 96 | break; |
| 97 | case TBF_EV_ASSIGN_ADD_PACCH: |
| 98 | mod_ass_type(ctx, GPRS_RLCMAC_FLAG_PACCH, true); |
| 99 | tbf_dl_fsm_state_chg(fi, TBF_ST_ASSIGN); |
| 100 | break; |
| 101 | default: |
| 102 | OSMO_ASSERT(0); |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | static void st_assign_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| 107 | { |
| 108 | struct tbf_dl_fsm_ctx *ctx = (struct tbf_dl_fsm_ctx *)fi->priv; |
| 109 | unsigned long val; |
| 110 | unsigned int sec, micro; |
| 111 | |
| 112 | /* If assignment for this TBF is happening on PACCH, that means the |
| 113 | * actual Assignment procedure (tx/rx) is happening on another TBF (eg |
| 114 | * Ul TBF vs DL TBF). Hence we add a security timer here to free it in |
| 115 | * case the other TBF doesn't succeed in informing (assigning) the MS |
| 116 | * about this TBF, or simply because the scheduler takes too long to |
| 117 | * schedule it. This timer can probably be dropped once we make the |
| 118 | * other TBF always signal us assignment failure (we already get |
| 119 | * assignment success through TBF_EV_ASSIGN_ACK_PACCH) */ |
| 120 | if (ctx->state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH)) { |
| 121 | fi->T = -2001; |
| 122 | val = osmo_tdef_get(the_pcu->T_defs, fi->T, OSMO_TDEF_MS, -1); |
| 123 | sec = val / 1000; |
| 124 | micro = (val % 1000) * 1000; |
Pau Espin Pedrol | 83a0892 | 2022-12-12 19:46:01 +0100 | [diff] [blame] | 125 | LOGPTBFDL(ctx->dl_tbf, LOGL_DEBUG, |
| 126 | "Starting timer X2001 [assignment (PACCH)] with %u sec. %u microsec\n", |
| 127 | sec, micro); |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 128 | osmo_timer_schedule(&fi->timer, sec, micro); |
| 129 | } else { |
| 130 | /* GPRS_RLCMAC_FLAG_CCCH is set, so here we submitted an DL Ass |
| 131 | * through PCUIF on CCCH */ |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | static void st_assign(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 136 | { |
| 137 | struct tbf_dl_fsm_ctx *ctx = (struct tbf_dl_fsm_ctx *)fi->priv; |
| 138 | unsigned long val; |
| 139 | unsigned int sec, micro; |
| 140 | |
| 141 | switch (event) { |
| 142 | case TBF_EV_ASSIGN_ADD_CCCH: |
| 143 | mod_ass_type(ctx, GPRS_RLCMAC_FLAG_CCCH, true); |
| 144 | break; |
| 145 | case TBF_EV_ASSIGN_ADD_PACCH: |
| 146 | mod_ass_type(ctx, GPRS_RLCMAC_FLAG_PACCH, true); |
| 147 | break; |
| 148 | case TBF_EV_ASSIGN_ACK_PACCH: |
| 149 | tbf_assign_control_ts(ctx->tbf); |
| 150 | if (ctx->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)) { |
| 151 | /* We now know that the PACCH really existed */ |
Pau Espin Pedrol | 83a0892 | 2022-12-12 19:46:01 +0100 | [diff] [blame] | 152 | LOGPTBFDL(ctx->dl_tbf, LOGL_INFO, |
| 153 | "The TBF has been confirmed on the PACCH, " |
| 154 | "changed type from CCCH to PACCH\n"); |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 155 | mod_ass_type(ctx, GPRS_RLCMAC_FLAG_CCCH, false); |
| 156 | mod_ass_type(ctx, GPRS_RLCMAC_FLAG_PACCH, true); |
| 157 | } |
| 158 | tbf_dl_fsm_state_chg(fi, TBF_ST_FLOW); |
| 159 | break; |
| 160 | case TBF_EV_ASSIGN_PCUIF_CNF: |
| 161 | /* BTS informs us it sent Imm Ass for DL TBF over CCCH. We now |
| 162 | * have to wait for X2002 to trigger (meaning MS is already |
| 163 | * listening on PDCH) in order to move to FLOW state and start |
| 164 | * transmitting data to it. When X2002 triggers (see cb timer |
| 165 | * end of the file) it will send TBF_EV_ASSIGN_READY_CCCH back |
Pau Espin Pedrol | d1058b9 | 2022-12-16 18:39:29 +0100 | [diff] [blame] | 166 | * to us here. |
| 167 | */ |
| 168 | if (!(ctx->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) { |
| 169 | /* This can happen if we initiated a CCCH DlAss from an |
| 170 | * older TBF object (same TLLI) towards BTS, and the DL-TBF |
| 171 | * was recreated and is now trying to be assigned throguh |
| 172 | * PACCH. |
| 173 | */ |
| 174 | LOGPTBFDL(ctx->dl_tbf, LOGL_INFO, |
| 175 | "Ignoring event ASSIGN_PCUIF_CNF from BTS " |
| 176 | "(CCCH was not requested on current assignment)\n"); |
| 177 | break; |
| 178 | } |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 179 | fi->T = -2002; |
| 180 | val = osmo_tdef_get(the_pcu->T_defs, fi->T, OSMO_TDEF_MS, -1); |
| 181 | sec = val / 1000; |
| 182 | micro = (val % 1000) * 1000; |
Pau Espin Pedrol | 83a0892 | 2022-12-12 19:46:01 +0100 | [diff] [blame] | 183 | LOGPTBFDL(ctx->dl_tbf, LOGL_DEBUG, |
| 184 | "Starting timer X2002 [assignment (AGCH)] with %u sec. %u microsec\n", |
| 185 | sec, micro); |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 186 | osmo_timer_schedule(&fi->timer, sec, micro); |
| 187 | break; |
| 188 | case TBF_EV_ASSIGN_READY_CCCH: |
| 189 | /* change state to FLOW, so scheduler will start transmission */ |
| 190 | tbf_dl_fsm_state_chg(fi, TBF_ST_FLOW); |
| 191 | break; |
| 192 | case TBF_EV_MAX_N3105: |
| 193 | /* We are going to release, so abort any Pkt Ul Ass pending to be scheduled: */ |
| 194 | osmo_fsm_inst_dispatch(tbf_ul_ass_fi(ctx->tbf), TBF_UL_ASS_EV_ABORT, NULL); |
| 195 | ctx->T_release = 3195; |
| 196 | tbf_dl_fsm_state_chg(fi, TBF_ST_RELEASING); |
| 197 | break; |
| 198 | default: |
| 199 | OSMO_ASSERT(0); |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | static void st_flow(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 204 | { |
| 205 | struct tbf_dl_fsm_ctx *ctx = (struct tbf_dl_fsm_ctx *)fi->priv; |
| 206 | |
| 207 | switch (event) { |
| 208 | case TBF_EV_DL_ACKNACK_MISS: |
| 209 | /* DL TBF: we missed a DL ACK/NACK. If we started assignment |
| 210 | * over CCCH and never received any DL ACK/NACK yet, it means we |
| 211 | * don't even know if the MS successfully received the Imm Ass on |
| 212 | * CCCH and hence is listening on PDCH. Let's better refrain |
| 213 | * from continuing and start assignment on CCCH again */ |
| 214 | if ((ctx->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)) |
| 215 | && !(ctx->state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) { |
| 216 | struct GprsMs *ms = tbf_ms(ctx->tbf); |
Pau Espin Pedrol | 83a0892 | 2022-12-12 19:46:01 +0100 | [diff] [blame] | 217 | LOGPTBFDL(ctx->dl_tbf, LOGL_DEBUG, |
| 218 | "Re-send downlink assignment on PCH (IMSI=%s)\n", |
| 219 | ms_imsi_is_valid(ms) ? ms_imsi(ms) : ""); |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 220 | tbf_dl_fsm_state_chg(fi, TBF_ST_ASSIGN); |
| 221 | /* send immediate assignment */ |
Pau Espin Pedrol | 83a0892 | 2022-12-12 19:46:01 +0100 | [diff] [blame] | 222 | bts_snd_dl_ass(ms->bts, ctx->dl_tbf); |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 223 | } |
| 224 | break; |
| 225 | case TBF_EV_LAST_DL_DATA_SENT: |
| 226 | /* All data has been sent or received, change state to FINISHED */ |
| 227 | tbf_dl_fsm_state_chg(fi, TBF_ST_FINISHED); |
| 228 | break; |
| 229 | case TBF_EV_FINAL_ACK_RECVD: |
| 230 | /* We received Final Ack (DL ACK/NACK) from MS. move to |
| 231 | * WAIT_RELEASE, we wait there for release or re-use the TBF in |
| 232 | * case we receive more DL data to tx */ |
| 233 | tbf_dl_fsm_state_chg(fi, TBF_ST_WAIT_RELEASE); |
| 234 | break; |
| 235 | case TBF_EV_MAX_N3105: |
| 236 | ctx->T_release = 3195; |
| 237 | tbf_dl_fsm_state_chg(fi, TBF_ST_RELEASING); |
| 238 | break; |
| 239 | default: |
| 240 | OSMO_ASSERT(0); |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | static void st_finished(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 245 | { |
| 246 | struct tbf_dl_fsm_ctx *ctx = (struct tbf_dl_fsm_ctx *)fi->priv; |
| 247 | |
| 248 | switch (event) { |
| 249 | case TBF_EV_DL_ACKNACK_MISS: |
| 250 | OSMO_ASSERT(tbf_direction(ctx->tbf) == GPRS_RLCMAC_DL_TBF); |
| 251 | break; |
| 252 | case TBF_EV_FINAL_ACK_RECVD: |
| 253 | /* We received Final Ack (DL ACK/NACK) from MS. move to |
| 254 | * WAIT_RELEASE, we wait there for release or re-use the TBF in |
| 255 | * case we receive more DL data to tx */ |
| 256 | tbf_dl_fsm_state_chg(fi, TBF_ST_WAIT_RELEASE); |
| 257 | break; |
| 258 | case TBF_EV_MAX_N3105: |
| 259 | ctx->T_release = 3195; |
| 260 | tbf_dl_fsm_state_chg(fi, TBF_ST_RELEASING); |
| 261 | break; |
| 262 | default: |
| 263 | OSMO_ASSERT(0); |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | static void st_wait_release_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| 268 | { |
| 269 | struct tbf_dl_fsm_ctx *ctx = (struct tbf_dl_fsm_ctx *)fi->priv; |
| 270 | unsigned long val_s, val_ms, val_us; |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 271 | |
| 272 | fi->T = 3193; |
| 273 | val_ms = osmo_tdef_get(tbf_ms(ctx->tbf)->bts->T_defs_bts, fi->T, OSMO_TDEF_MS, -1); |
| 274 | val_s = val_ms / 1000; |
| 275 | val_us = (val_ms % 1000) * 1000; |
Pau Espin Pedrol | 83a0892 | 2022-12-12 19:46:01 +0100 | [diff] [blame] | 276 | LOGPTBFDL(ctx->dl_tbf, LOGL_DEBUG, "starting timer T%u with %lu sec. %lu microsec\n", |
| 277 | fi->T, val_s, val_us); |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 278 | osmo_timer_schedule(&fi->timer, val_s, val_us); |
| 279 | |
| 280 | mod_ass_type(ctx, GPRS_RLCMAC_FLAG_CCCH, false); |
| 281 | } |
| 282 | |
| 283 | static void st_wait_release(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 284 | { |
| 285 | struct tbf_dl_fsm_ctx *ctx = (struct tbf_dl_fsm_ctx *)fi->priv; |
| 286 | switch (event) { |
| 287 | case TBF_EV_FINAL_ACK_RECVD: |
| 288 | /* ignore, duplicate ACK, we already know about since we are in WAIT_RELEASE */ |
| 289 | break; |
| 290 | case TBF_EV_MAX_N3105: |
| 291 | ctx->T_release = 3195; |
| 292 | tbf_dl_fsm_state_chg(fi, TBF_ST_RELEASING); |
| 293 | break; |
| 294 | default: |
| 295 | OSMO_ASSERT(0); |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | static void st_releasing_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| 300 | { |
| 301 | struct tbf_dl_fsm_ctx *ctx = (struct tbf_dl_fsm_ctx *)fi->priv; |
| 302 | unsigned long val; |
| 303 | |
| 304 | if (!ctx->T_release) |
| 305 | return; |
| 306 | |
| 307 | /* In general we should end up here with an assigned timer in ctx->T_release. Possible values are: |
| 308 | * T3195: Wait for reuse of TFI(s) when there is no response from the MS |
| 309 | * (radio failure or cell change) for this TBF/MBMS radio bearer. |
| 310 | * T3169: Wait for reuse of USF and TFI(s) after the MS uplink assignment for this TBF is invalid. |
| 311 | */ |
| 312 | val = osmo_tdef_get(tbf_ms(ctx->tbf)->bts->T_defs_bts, ctx->T_release, OSMO_TDEF_S, -1); |
| 313 | fi->T = ctx->T_release; |
Pau Espin Pedrol | 83a0892 | 2022-12-12 19:46:01 +0100 | [diff] [blame] | 314 | LOGPTBFDL(ctx->dl_tbf, LOGL_DEBUG, "starting timer T%u with %lu sec. %u microsec\n", |
| 315 | ctx->T_release, val, 0); |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 316 | osmo_timer_schedule(&fi->timer, val, 0); |
| 317 | } |
| 318 | |
| 319 | static void st_releasing(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 320 | { |
| 321 | struct tbf_dl_fsm_ctx *ctx = (struct tbf_dl_fsm_ctx *)fi->priv; |
| 322 | switch (event) { |
| 323 | case TBF_EV_DL_ACKNACK_MISS: |
| 324 | OSMO_ASSERT(tbf_direction(ctx->tbf) == GPRS_RLCMAC_DL_TBF); |
| 325 | /* Ignore, we don't care about missed DL ACK/NACK poll timeouts |
| 326 | * anymore, we are already releasing the TBF */ |
| 327 | break; |
| 328 | default: |
| 329 | OSMO_ASSERT(0); |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | static void handle_timeout_X2002(struct osmo_fsm_inst *fi) |
| 334 | { |
| 335 | struct tbf_dl_fsm_ctx *ctx = (struct tbf_dl_fsm_ctx *)fi->priv; |
Pau Espin Pedrol | b7a2b59 | 2022-12-13 14:43:59 +0100 | [diff] [blame] | 336 | int rc; |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 337 | |
Pau Espin Pedrol | b7a2b59 | 2022-12-13 14:43:59 +0100 | [diff] [blame] | 338 | if (fi->state != TBF_ST_ASSIGN) { |
Pau Espin Pedrol | 83a0892 | 2022-12-12 19:46:01 +0100 | [diff] [blame] | 339 | LOGPTBFDL(ctx->dl_tbf, LOGL_NOTICE, "Continue flow after IMM.ASS confirm\n"); |
Pau Espin Pedrol | b7a2b59 | 2022-12-13 14:43:59 +0100 | [diff] [blame] | 340 | return; |
| 341 | } |
| 342 | |
| 343 | /* state TBF_ST_ASSIGN: */ |
| 344 | tbf_assign_control_ts(ctx->tbf); |
| 345 | |
| 346 | if (!tbf_can_upgrade_to_multislot(ctx->tbf)) { |
| 347 | /* change state to FLOW, so scheduler will start transmission */ |
| 348 | osmo_fsm_inst_dispatch(fi, TBF_EV_ASSIGN_READY_CCCH, NULL); |
| 349 | return; |
| 350 | } |
| 351 | |
| 352 | /* This tbf can be upgraded to use multiple DL timeslots and now that there is already |
| 353 | * one slot assigned send another DL assignment via PDCH. |
| 354 | */ |
| 355 | |
| 356 | /* keep TO flags */ |
| 357 | ctx->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; |
| 358 | |
| 359 | rc = dl_tbf_upgrade_to_multislot(ctx->dl_tbf); |
Pau Espin Pedrol | 4a09054 | 2022-12-13 14:48:31 +0100 | [diff] [blame] | 360 | if (rc < 0) |
Pau Espin Pedrol | b7a2b59 | 2022-12-13 14:43:59 +0100 | [diff] [blame] | 361 | tbf_free(ctx->tbf); |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 362 | } |
| 363 | |
| 364 | static int tbf_dl_fsm_timer_cb(struct osmo_fsm_inst *fi) |
| 365 | { |
| 366 | struct tbf_dl_fsm_ctx *ctx = (struct tbf_dl_fsm_ctx *)fi->priv; |
| 367 | switch (fi->T) { |
| 368 | case -2002: |
| 369 | handle_timeout_X2002(fi); |
| 370 | break; |
| 371 | case -2001: |
Pau Espin Pedrol | 83a0892 | 2022-12-12 19:46:01 +0100 | [diff] [blame] | 372 | LOGPTBFDL(ctx->dl_tbf, LOGL_NOTICE, "releasing due to PACCH assignment timeout.\n"); |
Pau Espin Pedrol | 343c0ee | 2022-11-17 19:55:08 +0100 | [diff] [blame] | 373 | /* fall-through */ |
| 374 | case 3169: |
| 375 | case 3193: |
| 376 | case 3195: |
| 377 | tbf_free(ctx->tbf); |
| 378 | break; |
| 379 | default: |
| 380 | OSMO_ASSERT(0); |
| 381 | } |
| 382 | return 0; |
| 383 | } |
| 384 | |
| 385 | static struct osmo_fsm_state tbf_dl_fsm_states[] = { |
| 386 | [TBF_ST_NEW] = { |
| 387 | .in_event_mask = |
| 388 | X(TBF_EV_ASSIGN_ADD_CCCH) | |
| 389 | X(TBF_EV_ASSIGN_ADD_PACCH), |
| 390 | .out_state_mask = |
| 391 | X(TBF_ST_ASSIGN) | |
| 392 | X(TBF_ST_RELEASING), |
| 393 | .name = "NEW", |
| 394 | .action = st_new, |
| 395 | }, |
| 396 | [TBF_ST_ASSIGN] = { |
| 397 | .in_event_mask = |
| 398 | X(TBF_EV_ASSIGN_ADD_CCCH) | |
| 399 | X(TBF_EV_ASSIGN_ADD_PACCH) | |
| 400 | X(TBF_EV_ASSIGN_ACK_PACCH) | |
| 401 | X(TBF_EV_ASSIGN_PCUIF_CNF) | |
| 402 | X(TBF_EV_ASSIGN_READY_CCCH) | |
| 403 | X(TBF_EV_MAX_N3105), |
| 404 | .out_state_mask = |
| 405 | X(TBF_ST_FLOW) | |
| 406 | X(TBF_ST_FINISHED) | |
| 407 | X(TBF_ST_RELEASING), |
| 408 | .name = "ASSIGN", |
| 409 | .action = st_assign, |
| 410 | .onenter = st_assign_on_enter, |
| 411 | }, |
| 412 | [TBF_ST_FLOW] = { |
| 413 | .in_event_mask = |
| 414 | X(TBF_EV_DL_ACKNACK_MISS) | |
| 415 | X(TBF_EV_LAST_DL_DATA_SENT) | |
| 416 | X(TBF_EV_FINAL_ACK_RECVD) | |
| 417 | X(TBF_EV_MAX_N3105), |
| 418 | .out_state_mask = |
| 419 | X(TBF_ST_ASSIGN) | |
| 420 | X(TBF_ST_FINISHED) | |
| 421 | X(TBF_ST_WAIT_RELEASE) | |
| 422 | X(TBF_ST_RELEASING), |
| 423 | .name = "FLOW", |
| 424 | .action = st_flow, |
| 425 | }, |
| 426 | [TBF_ST_FINISHED] = { |
| 427 | .in_event_mask = |
| 428 | X(TBF_EV_DL_ACKNACK_MISS) | |
| 429 | X(TBF_EV_FINAL_ACK_RECVD) | |
| 430 | X(TBF_EV_MAX_N3105), |
| 431 | .out_state_mask = |
| 432 | X(TBF_ST_WAIT_RELEASE) | |
| 433 | X(TBF_ST_RELEASING), |
| 434 | .name = "FINISHED", |
| 435 | .action = st_finished, |
| 436 | }, |
| 437 | [TBF_ST_WAIT_RELEASE] = { |
| 438 | .in_event_mask = |
| 439 | X(TBF_EV_FINAL_ACK_RECVD) | |
| 440 | X(TBF_EV_MAX_N3105), |
| 441 | .out_state_mask = |
| 442 | X(TBF_ST_RELEASING), |
| 443 | .name = "WAIT_RELEASE", |
| 444 | .action = st_wait_release, |
| 445 | .onenter = st_wait_release_on_enter, |
| 446 | }, |
| 447 | [TBF_ST_RELEASING] = { |
| 448 | .in_event_mask = |
| 449 | X(TBF_EV_DL_ACKNACK_MISS), |
| 450 | .out_state_mask = |
| 451 | 0, |
| 452 | .name = "RELEASING", |
| 453 | .action = st_releasing, |
| 454 | .onenter = st_releasing_on_enter, |
| 455 | }, |
| 456 | }; |
| 457 | |
| 458 | struct osmo_fsm tbf_dl_fsm = { |
| 459 | .name = "DL_TBF", |
| 460 | .states = tbf_dl_fsm_states, |
| 461 | .num_states = ARRAY_SIZE(tbf_dl_fsm_states), |
| 462 | .timer_cb = tbf_dl_fsm_timer_cb, |
| 463 | .log_subsys = DTBFDL, |
| 464 | .event_names = tbf_fsm_event_names, |
| 465 | }; |
| 466 | |
| 467 | static __attribute__((constructor)) void tbf_dl_fsm_init(void) |
| 468 | { |
| 469 | OSMO_ASSERT(osmo_fsm_register(&tbf_dl_fsm) == 0); |
| 470 | } |