Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 by Holger Hans Peter Freyther |
| 3 | * Copyright (C) 2018 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> |
| 4 | * |
| 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Affero General Public License as published by |
| 9 | * the Free Software Foundation; either version 3 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Affero General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <bts.h> |
| 23 | #include <pdch.h> |
| 24 | #include <decoding.h> |
| 25 | #include <encoding.h> |
| 26 | #include <gprs_rlcmac.h> |
| 27 | #include <gprs_debug.h> |
| 28 | #include <gprs_coding_scheme.h> |
| 29 | #include <gprs_ms.h> |
| 30 | #include <gprs_ms_storage.h> |
| 31 | #include <pcu_l1_if.h> |
| 32 | #include <rlc.h> |
| 33 | #include <sba.h> |
| 34 | #include <tbf.h> |
Pau Espin Pedrol | 9d1cdb1 | 2019-09-25 17:47:02 +0200 | [diff] [blame] | 35 | #include <tbf_ul.h> |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 36 | #include <cxx_linuxlist.h> |
| 37 | #include <gsm_rlcmac.h> |
| 38 | |
| 39 | extern "C" { |
| 40 | #include <osmocom/core/talloc.h> |
| 41 | #include <osmocom/core/msgb.h> |
| 42 | #include <osmocom/gsm/protocol/gsm_04_08.h> |
| 43 | #include <osmocom/core/bitvec.h> |
| 44 | #include <osmocom/core/gsmtap.h> |
| 45 | #include <osmocom/core/logging.h> |
| 46 | #include <osmocom/core/utils.h> |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 47 | #include "coding_scheme.h" |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 48 | } |
| 49 | |
| 50 | #include <errno.h> |
Vadim Yanitskiy | bd0dac3 | 2019-10-05 21:57:14 +0700 | [diff] [blame] | 51 | #include <stdlib.h> |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 52 | #include <arpa/inet.h> |
| 53 | |
| 54 | extern void *tall_pcu_ctx; |
| 55 | |
| 56 | static void get_rx_qual_meas(struct pcu_l1_meas *meas, uint8_t rx_qual_enc) |
| 57 | { |
| 58 | static const int16_t rx_qual_map[] = { |
| 59 | 0, /* 0,14 % */ |
| 60 | 0, /* 0,28 % */ |
| 61 | 1, /* 0,57 % */ |
| 62 | 1, /* 1,13 % */ |
| 63 | 2, /* 2,26 % */ |
| 64 | 5, /* 4,53 % */ |
| 65 | 9, /* 9,05 % */ |
| 66 | 18, /* 18,10 % */ |
| 67 | }; |
| 68 | |
| 69 | meas->set_ms_rx_qual(rx_qual_map[ |
| 70 | OSMO_MIN(rx_qual_enc, ARRAY_SIZE(rx_qual_map)-1) |
| 71 | ]); |
| 72 | } |
| 73 | |
| 74 | static void get_meas(struct pcu_l1_meas *meas, |
| 75 | const Packet_Resource_Request_t *qr) |
| 76 | { |
| 77 | unsigned i; |
| 78 | |
| 79 | meas->set_ms_c_value(qr->C_VALUE); |
| 80 | if (qr->Exist_SIGN_VAR) |
| 81 | meas->set_ms_sign_var((qr->SIGN_VAR + 2) / 4); /* SIGN_VAR * 0.25 dB */ |
| 82 | |
| 83 | for (i = 0; i < OSMO_MIN(ARRAY_SIZE(qr->Slot), ARRAY_SIZE(meas->ts)); i++) |
| 84 | { |
| 85 | if (qr->Slot[i].Exist) { |
| 86 | LOGP(DRLCMAC, LOGL_INFO, |
| 87 | "Packet resource request: i_level[%d] = %d\n", |
| 88 | i, qr->Slot[i].I_LEVEL); |
| 89 | meas->set_ms_i_level(i, -2 * qr->Slot[i].I_LEVEL); |
| 90 | } |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | static void get_meas(struct pcu_l1_meas *meas, |
| 95 | const Channel_Quality_Report_t *qr) |
| 96 | { |
| 97 | unsigned i; |
| 98 | |
| 99 | get_rx_qual_meas(meas, qr->RXQUAL); |
| 100 | meas->set_ms_c_value(qr->C_VALUE); |
| 101 | meas->set_ms_sign_var((qr->SIGN_VAR + 2) / 4); /* SIGN_VAR * 0.25 dB */ |
| 102 | |
| 103 | for (i = 0; i < OSMO_MIN(ARRAY_SIZE(qr->Slot), ARRAY_SIZE(meas->ts)); i++) |
| 104 | { |
| 105 | if (qr->Slot[i].Exist) { |
| 106 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 107 | "Channel quality report: i_level[%d] = %d\n", |
| 108 | i, qr->Slot[i].I_LEVEL_TN); |
| 109 | meas->set_ms_i_level(i, -2 * qr->Slot[i].I_LEVEL_TN); |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | static inline void sched_ul_ass_or_rej(BTS *bts, gprs_rlcmac_bts *bts_data, struct gprs_rlcmac_dl_tbf *tbf) |
| 115 | { |
| 116 | bts->channel_request_description(); |
| 117 | |
| 118 | /* This call will register the new TBF with the MS on success */ |
| 119 | gprs_rlcmac_ul_tbf *ul_tbf = tbf_alloc_ul(bts_data, tbf->trx->trx_no, tbf->ms_class(), |
| 120 | tbf->ms()->egprs_ms_class(), tbf->tlli(), tbf->ta(), tbf->ms()); |
| 121 | |
| 122 | /* schedule uplink assignment or reject */ |
| 123 | if (ul_tbf) { |
| 124 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack message, so we provide one:\n"); |
| 125 | TBF_SET_ASS_STATE_UL(tbf, GPRS_RLCMAC_UL_ASS_SEND_ASS); |
| 126 | } else { |
| 127 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack message, so we packet access reject:\n"); |
| 128 | TBF_SET_ASS_STATE_UL(tbf, GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | void gprs_rlcmac_pdch::enable() |
| 133 | { |
| 134 | /* TODO: Check if there are still allocated resources.. */ |
| 135 | INIT_LLIST_HEAD(&paging_list); |
| 136 | m_is_enabled = 1; |
| 137 | } |
| 138 | |
| 139 | void gprs_rlcmac_pdch::disable() |
| 140 | { |
| 141 | /* TODO.. kick free_resources once we know the TRX/TS we are on */ |
| 142 | m_is_enabled = 0; |
| 143 | } |
| 144 | |
| 145 | void gprs_rlcmac_pdch::free_resources() |
| 146 | { |
| 147 | struct gprs_rlcmac_paging *pag; |
| 148 | |
| 149 | /* we are not enabled. there should be no resources */ |
| 150 | if (!is_enabled()) |
| 151 | return; |
| 152 | |
| 153 | /* kick all TBF on slot */ |
| 154 | gprs_rlcmac_tbf::free_all(this); |
| 155 | |
| 156 | /* flush all pending paging messages */ |
| 157 | while ((pag = dequeue_paging())) |
| 158 | talloc_free(pag); |
| 159 | |
| 160 | trx->bts->sba()->free_resources(this); |
| 161 | } |
| 162 | |
| 163 | struct gprs_rlcmac_paging *gprs_rlcmac_pdch::dequeue_paging() |
| 164 | { |
| 165 | struct gprs_rlcmac_paging *pag; |
| 166 | |
| 167 | if (llist_empty(&paging_list)) |
| 168 | return NULL; |
| 169 | pag = llist_entry(paging_list.next, struct gprs_rlcmac_paging, list); |
| 170 | llist_del(&pag->list); |
| 171 | |
| 172 | return pag; |
| 173 | } |
| 174 | |
| 175 | struct msgb *gprs_rlcmac_pdch::packet_paging_request() |
| 176 | { |
| 177 | struct gprs_rlcmac_paging *pag; |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 178 | RlcMacDownlink_t *mac_control_block; |
| 179 | bitvec *pag_vec; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 180 | struct msgb *msg; |
| 181 | unsigned wp = 0, len; |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 182 | int rc; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 183 | |
| 184 | /* no paging, no message */ |
| 185 | pag = dequeue_paging(); |
| 186 | if (!pag) |
| 187 | return NULL; |
| 188 | |
| 189 | LOGP(DRLCMAC, LOGL_DEBUG, "Scheduling paging\n"); |
| 190 | |
| 191 | /* alloc message */ |
| 192 | msg = msgb_alloc(23, "pag ctrl block"); |
| 193 | if (!msg) { |
| 194 | talloc_free(pag); |
| 195 | return NULL; |
| 196 | } |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 197 | pag_vec = bitvec_alloc(23, tall_pcu_ctx); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 198 | if (!pag_vec) { |
| 199 | msgb_free(msg); |
| 200 | talloc_free(pag); |
| 201 | return NULL; |
| 202 | } |
| 203 | wp = Encoding::write_packet_paging_request(pag_vec); |
| 204 | |
| 205 | /* loop until message is full */ |
| 206 | while (pag) { |
| 207 | /* try to add paging */ |
| 208 | if ((pag->identity_lv[1] & 0x07) == 4) { |
| 209 | /* TMSI */ |
| 210 | LOGP(DRLCMAC, LOGL_DEBUG, "- TMSI=0x%08x\n", |
| 211 | ntohl(*((uint32_t *)(pag->identity_lv + 1)))); |
| 212 | len = 1 + 1 + 1 + 32 + 2 + 1; |
| 213 | if (pag->identity_lv[0] != 5) { |
| 214 | LOGP(DRLCMAC, LOGL_ERROR, "TMSI paging with " |
| 215 | "MI != 5 octets!\n"); |
| 216 | goto continue_next; |
| 217 | } |
| 218 | } else { |
| 219 | /* MI */ |
| 220 | LOGP(DRLCMAC, LOGL_DEBUG, "- MI=%s\n", |
| 221 | osmo_hexdump(pag->identity_lv + 1, |
| 222 | pag->identity_lv[0])); |
| 223 | len = 1 + 1 + 1 + 4 + (pag->identity_lv[0]<<3) + 2 + 1; |
| 224 | if (pag->identity_lv[0] > 8) { |
| 225 | LOGP(DRLCMAC, LOGL_ERROR, "Paging with " |
| 226 | "MI > 8 octets!\n"); |
| 227 | goto continue_next; |
| 228 | } |
| 229 | } |
| 230 | if (wp + len > 184) { |
| 231 | LOGP(DRLCMAC, LOGL_DEBUG, "- Does not fit, so schedule " |
| 232 | "next time\n"); |
| 233 | /* put back paging record, because does not fit */ |
| 234 | llist_add_tail(&pag->list, &paging_list); |
| 235 | break; |
| 236 | } |
| 237 | Encoding::write_repeated_page_info(pag_vec, wp, pag->identity_lv[0], |
| 238 | pag->identity_lv + 1, pag->chan_needed); |
| 239 | |
| 240 | continue_next: |
| 241 | talloc_free(pag); |
| 242 | pag = dequeue_paging(); |
| 243 | } |
| 244 | |
| 245 | bitvec_pack(pag_vec, msgb_put(msg, 23)); |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 246 | mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 247 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Paging Request +++++++++++++++++++++++++\n"); |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 248 | rc = decode_gsm_rlcmac_downlink(pag_vec, mac_control_block); |
| 249 | if (rc < 0) { |
| 250 | LOGP(DRLCMAC, LOGL_ERROR, "Decoding of Downlink Packet Paging Request failed (%d)\n", rc); |
| 251 | goto free_ret; |
| 252 | } |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 253 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Paging Request -------------------------\n"); |
| 254 | bitvec_free(pag_vec); |
| 255 | talloc_free(mac_control_block); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 256 | return msg; |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 257 | |
| 258 | free_ret: |
| 259 | bitvec_free(pag_vec); |
| 260 | talloc_free(mac_control_block); |
| 261 | msgb_free(msg); |
| 262 | return NULL; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 263 | } |
| 264 | |
Pau Espin Pedrol | fbfab29 | 2019-12-23 13:19:25 +0100 | [diff] [blame] | 265 | bool gprs_rlcmac_pdch::add_paging(uint8_t chan_needed, const uint8_t *mi, uint8_t mi_len) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 266 | { |
| 267 | struct gprs_rlcmac_paging *pag = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_paging); |
| 268 | if (!pag) |
| 269 | return false; |
| 270 | |
| 271 | pag->chan_needed = chan_needed; |
Pau Espin Pedrol | fbfab29 | 2019-12-23 13:19:25 +0100 | [diff] [blame] | 272 | pag->identity_lv[0] = mi_len; |
| 273 | memcpy(&pag->identity_lv[1], mi, mi_len); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 274 | |
| 275 | llist_add(&pag->list, &paging_list); |
| 276 | |
| 277 | return true; |
| 278 | } |
| 279 | |
| 280 | void gprs_rlcmac_pdch::rcv_control_ack(Packet_Control_Acknowledgement_t *packet, uint32_t fn) |
| 281 | { |
| 282 | struct gprs_rlcmac_tbf *tbf, *new_tbf; |
| 283 | uint32_t tlli = packet->TLLI; |
| 284 | GprsMs *ms = bts()->ms_by_tlli(tlli); |
| 285 | gprs_rlcmac_ul_tbf *ul_tbf; |
| 286 | |
| 287 | tbf = bts()->ul_tbf_by_poll_fn(fn, trx_no(), ts_no); |
| 288 | if (!tbf) |
| 289 | tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no); |
| 290 | |
| 291 | if (!tbf) { |
| 292 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " |
| 293 | "unknown FN=%u TLLI=0x%08x (TRX %d TS %d)\n", |
| 294 | fn, tlli, trx_no(), ts_no); |
| 295 | if (ms) |
| 296 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " |
| 297 | "unknown TBF corresponds to MS with IMSI %s, TA %d, " |
| 298 | "uTBF (TFI=%d, state=%s), dTBF (TFI=%d, state=%s)\n", |
| 299 | ms->imsi(), ms->ta(), |
| 300 | ms->ul_tbf() ? ms->ul_tbf()->tfi() : 0, |
| 301 | ms->ul_tbf() ? ms->ul_tbf()->state_name() : "None", |
| 302 | ms->dl_tbf() ? ms->dl_tbf()->tfi() : 0, |
| 303 | ms->dl_tbf() ? ms->dl_tbf()->state_name() : "None"); |
| 304 | return; |
| 305 | } |
| 306 | |
| 307 | /* Reset N3101 counter: */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 308 | tbf->n_reset(N3101); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 309 | |
| 310 | tbf->update_ms(tlli, GPRS_RLCMAC_UL_TBF); |
| 311 | |
| 312 | LOGPTBF(tbf, LOGL_DEBUG, "RX: [PCU <- BTS] Packet Control Ack\n"); |
| 313 | TBF_POLL_SCHED_UNSET(tbf); |
| 314 | |
| 315 | /* check if this control ack belongs to packet uplink ack */ |
| 316 | ul_tbf = as_ul_tbf(tbf); |
| 317 | if (ul_tbf && ul_tbf->handle_ctrl_ack()) { |
| 318 | LOGPTBF(tbf, LOGL_DEBUG, "[UPLINK] END\n"); |
| 319 | if (ul_tbf->ctrl_ack_to_toggle()) |
| 320 | LOGPTBF(tbf, LOGL_NOTICE, "Recovered uplink ack for UL\n"); |
| 321 | |
| 322 | tbf_free(tbf); |
| 323 | return; |
| 324 | } |
| 325 | if (tbf->dl_ass_state_is(GPRS_RLCMAC_DL_ASS_WAIT_ACK)) { |
| 326 | LOGPTBF(tbf, LOGL_DEBUG, "[UPLINK] DOWNLINK ASSIGNED\n"); |
| 327 | /* reset N3105 */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 328 | tbf->n_reset(N3105); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 329 | TBF_SET_ASS_STATE_DL(tbf, GPRS_RLCMAC_DL_ASS_NONE); |
| 330 | |
| 331 | new_tbf = tbf->ms() ? tbf->ms()->dl_tbf() : NULL; |
| 332 | if (!new_tbf) { |
| 333 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL " |
| 334 | "TBF is gone TLLI=0x%08x\n", tlli); |
| 335 | return; |
| 336 | } |
| 337 | if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE) && |
| 338 | tbf->direction == new_tbf->direction) |
| 339 | tbf_free(tbf); |
| 340 | |
| 341 | if (new_tbf->check_n_clear(GPRS_RLCMAC_FLAG_CCCH)) { |
| 342 | /* We now know that the PACCH really existed */ |
| 343 | LOGPTBF(new_tbf, LOGL_INFO, |
| 344 | "The TBF has been confirmed on the PACCH, " |
| 345 | "changed type from CCCH to PACCH\n"); |
| 346 | TBF_ASS_TYPE_SET(new_tbf, GPRS_RLCMAC_FLAG_PACCH); |
| 347 | } |
| 348 | TBF_SET_STATE(new_tbf, GPRS_RLCMAC_FLOW); |
| 349 | /* stop pending assignment timer */ |
| 350 | new_tbf->t_stop(T0, "control acked (DL-TBF)"); |
| 351 | if (new_tbf->check_n_clear(GPRS_RLCMAC_FLAG_TO_DL_ASS)) |
| 352 | LOGPTBF(new_tbf, LOGL_NOTICE, "Recovered downlink assignment\n"); |
| 353 | |
| 354 | tbf_assign_control_ts(new_tbf); |
| 355 | return; |
| 356 | } |
| 357 | if (tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_WAIT_ACK)) { |
| 358 | LOGPTBF(tbf, LOGL_DEBUG, "[DOWNLINK] UPLINK ASSIGNED\n"); |
| 359 | /* reset N3105 */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 360 | tbf->n_reset(N3105); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 361 | TBF_SET_ASS_STATE_UL(tbf, GPRS_RLCMAC_UL_ASS_NONE); |
| 362 | |
| 363 | new_tbf = tbf->ms() ? tbf->ms()->ul_tbf() : NULL; |
| 364 | if (!new_tbf) { |
| 365 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL " |
| 366 | "TBF is gone TLLI=0x%08x\n", tlli); |
| 367 | return; |
| 368 | } |
| 369 | if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE) && |
| 370 | tbf->direction == new_tbf->direction) |
| 371 | tbf_free(tbf); |
| 372 | |
| 373 | TBF_SET_STATE(new_tbf, GPRS_RLCMAC_FLOW); |
| 374 | if (new_tbf->check_n_clear(GPRS_RLCMAC_FLAG_TO_UL_ASS)) |
| 375 | LOGPTBF(new_tbf, LOGL_NOTICE, "Recovered uplink assignment for UL\n"); |
| 376 | |
| 377 | tbf_assign_control_ts(new_tbf); |
| 378 | /* there might be LLC packets waiting in the queue, but the DL |
| 379 | * TBF might have been released while the UL TBF has been |
| 380 | * established */ |
| 381 | if (new_tbf->ms()->need_dl_tbf()) |
| 382 | new_tbf->establish_dl_tbf_on_pacch(); |
| 383 | |
| 384 | return; |
| 385 | } |
| 386 | LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK " |
| 387 | "at no request\n"); |
| 388 | } |
| 389 | |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 390 | void gprs_rlcmac_pdch::rcv_control_dl_ack_nack(Packet_Downlink_Ack_Nack_t *ack_nack, uint32_t fn, struct pcu_l1_meas *meas) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 391 | { |
| 392 | int8_t tfi = 0; /* must be signed */ |
| 393 | struct gprs_rlcmac_dl_tbf *tbf; |
| 394 | int rc; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 395 | int num_blocks; |
| 396 | uint8_t bits_data[RLC_GPRS_WS/8]; |
| 397 | bitvec bits; |
| 398 | int bsn_begin, bsn_end; |
| 399 | char show_bits[RLC_GPRS_WS + 1]; |
| 400 | |
| 401 | tfi = ack_nack->DOWNLINK_TFI; |
| 402 | tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no); |
| 403 | if (!tbf) { |
| 404 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
| 405 | "unknown FN=%u TFI=%d (TRX %d TS %d)\n", |
| 406 | fn, tfi, trx_no(), ts_no); |
| 407 | return; |
| 408 | } |
| 409 | if (tbf->tfi() != tfi) { |
| 410 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
| 411 | "wrong TFI=%d, ignoring!\n", tfi); |
| 412 | return; |
| 413 | } |
| 414 | |
| 415 | /* Reset N3101 counter: */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 416 | tbf->n_reset(N3101); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 417 | |
| 418 | if (tbf->handle_ack_nack()) |
| 419 | LOGPTBF(tbf, LOGL_NOTICE, "Recovered downlink ack\n"); |
| 420 | |
| 421 | LOGPTBF(tbf, LOGL_DEBUG, "RX: [PCU <- BTS] Packet Downlink Ack/Nack\n"); |
| 422 | |
| 423 | bits.data = bits_data; |
| 424 | bits.data_len = sizeof(bits_data); |
| 425 | bits.cur_bit = 0; |
| 426 | |
| 427 | num_blocks = Decoding::decode_gprs_acknack_bits( |
| 428 | &ack_nack->Ack_Nack_Description, &bits, |
| 429 | &bsn_begin, &bsn_end, tbf->window()); |
| 430 | |
| 431 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 432 | "Got GPRS DL ACK bitmap: SSN: %d, BSN %d to %d - 1 (%d blocks), " |
| 433 | "\"%s\"\n", |
| 434 | ack_nack->Ack_Nack_Description.STARTING_SEQUENCE_NUMBER, |
| 435 | bsn_begin, bsn_end, num_blocks, |
| 436 | (Decoding::extract_rbb(&bits, show_bits), show_bits)); |
| 437 | |
| 438 | rc = tbf->rcvd_dl_ack( |
| 439 | ack_nack->Ack_Nack_Description.FINAL_ACK_INDICATION, |
| 440 | bsn_begin, &bits); |
| 441 | if (rc == 1) { |
| 442 | tbf_free(tbf); |
| 443 | return; |
| 444 | } |
| 445 | /* check for channel request */ |
| 446 | if (ack_nack->Exist_Channel_Request_Description) |
| 447 | sched_ul_ass_or_rej(bts(), bts_data(), tbf); |
| 448 | |
| 449 | /* get measurements */ |
| 450 | if (tbf->ms()) { |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 451 | get_meas(meas, &ack_nack->Channel_Quality_Report); |
| 452 | tbf->ms()->update_l1_meas(meas); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 453 | } |
| 454 | } |
| 455 | |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 456 | void gprs_rlcmac_pdch::rcv_control_egprs_dl_ack_nack(EGPRS_PD_AckNack_t *ack_nack, uint32_t fn, struct pcu_l1_meas *meas) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 457 | { |
| 458 | int8_t tfi = 0; /* must be signed */ |
| 459 | struct gprs_rlcmac_dl_tbf *tbf; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 460 | int rc; |
| 461 | int num_blocks; |
| 462 | uint8_t bits_data[RLC_EGPRS_MAX_WS/8]; |
| 463 | char show_bits[RLC_EGPRS_MAX_WS + 1]; |
| 464 | bitvec bits; |
| 465 | int bsn_begin, bsn_end; |
| 466 | |
| 467 | tfi = ack_nack->DOWNLINK_TFI; |
| 468 | tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no); |
| 469 | if (!tbf) { |
| 470 | LOGP(DRLCMAC, LOGL_NOTICE, "EGPRS PACKET DOWNLINK ACK with " |
| 471 | "unknown FN=%u TFI=%d (TRX %d TS %d)\n", |
| 472 | fn, tfi, trx_no(), ts_no); |
| 473 | return; |
| 474 | } |
| 475 | if (tbf->tfi() != tfi) { |
| 476 | LOGP(DRLCMAC, LOGL_NOTICE, "EGPRS PACKET DOWNLINK ACK with " |
| 477 | "wrong TFI=%d, ignoring!\n", tfi); |
| 478 | return; |
| 479 | } |
| 480 | |
| 481 | /* Reset N3101 counter: */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 482 | tbf->n_reset(N3101); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 483 | |
| 484 | if (tbf->handle_ack_nack()) |
| 485 | LOGPTBF(tbf, LOGL_NOTICE, "Recovered EGPRS downlink ack\n"); |
| 486 | |
| 487 | LOGPTBF(tbf, LOGL_DEBUG, |
| 488 | "RX: [PCU <- BTS] EGPRS Packet Downlink Ack/Nack\n"); |
| 489 | |
| 490 | LOGP(DRLCMAC, LOGL_DEBUG, "EGPRS ACK/NACK: " |
| 491 | "ut: %d, final: %d, bow: %d, eow: %d, ssn: %d, have_crbb: %d, " |
| 492 | "urbb_len:%d, %p, %p, %d, %d, win: %d-%d, urbb: %s\n", |
| 493 | (int)ack_nack->EGPRS_AckNack.UnionType, |
| 494 | (int)ack_nack->EGPRS_AckNack.Desc.FINAL_ACK_INDICATION, |
| 495 | (int)ack_nack->EGPRS_AckNack.Desc.BEGINNING_OF_WINDOW, |
| 496 | (int)ack_nack->EGPRS_AckNack.Desc.END_OF_WINDOW, |
| 497 | (int)ack_nack->EGPRS_AckNack.Desc.STARTING_SEQUENCE_NUMBER, |
| 498 | (int)ack_nack->EGPRS_AckNack.Desc.Exist_CRBB, |
| 499 | (int)ack_nack->EGPRS_AckNack.Desc.URBB_LENGTH, |
| 500 | (void *)&ack_nack->EGPRS_AckNack.UnionType, |
| 501 | (void *)&ack_nack->EGPRS_AckNack.Desc, |
| 502 | (int)offsetof(EGPRS_AckNack_t, Desc), |
| 503 | (int)offsetof(EGPRS_AckNack_w_len_t, Desc), |
| 504 | tbf->window()->v_a(), |
| 505 | tbf->window()->v_s(), |
| 506 | osmo_hexdump((const uint8_t *)&ack_nack->EGPRS_AckNack.Desc.URBB, |
| 507 | sizeof(ack_nack->EGPRS_AckNack.Desc.URBB))); |
| 508 | |
| 509 | bits.data = bits_data; |
| 510 | bits.data_len = sizeof(bits_data); |
| 511 | bits.cur_bit = 0; |
| 512 | |
| 513 | num_blocks = Decoding::decode_egprs_acknack_bits( |
| 514 | &ack_nack->EGPRS_AckNack.Desc, &bits, |
| 515 | &bsn_begin, &bsn_end, tbf->window()); |
| 516 | |
| 517 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 518 | "Got EGPRS DL ACK bitmap: SSN: %d, BSN %d to %d - 1 (%d blocks), " |
| 519 | "\"%s\"\n", |
| 520 | ack_nack->EGPRS_AckNack.Desc.STARTING_SEQUENCE_NUMBER, |
| 521 | bsn_begin, bsn_end, num_blocks, |
| 522 | (Decoding::extract_rbb(&bits, show_bits), show_bits) |
| 523 | ); |
| 524 | |
| 525 | rc = tbf->rcvd_dl_ack( |
| 526 | ack_nack->EGPRS_AckNack.Desc.FINAL_ACK_INDICATION, |
| 527 | bsn_begin, &bits); |
| 528 | if (rc == 1) { |
| 529 | tbf_free(tbf); |
| 530 | return; |
| 531 | } |
| 532 | |
| 533 | /* check for channel request */ |
| 534 | if (ack_nack->Exist_ChannelRequestDescription) |
| 535 | sched_ul_ass_or_rej(bts(), bts_data(), tbf); |
| 536 | |
| 537 | /* get measurements */ |
| 538 | if (tbf->ms()) { |
| 539 | /* TODO: Implement Measurements parsing for EGPRS */ |
| 540 | /* |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 541 | get_meas(meas, &ack_nack->Channel_Quality_Report); |
| 542 | tbf->ms()->update_l1_meas(meas); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 543 | */ |
| 544 | } |
| 545 | } |
| 546 | |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 547 | void gprs_rlcmac_pdch::rcv_resource_request(Packet_Resource_Request_t *request, uint32_t fn, struct pcu_l1_meas *meas) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 548 | { |
| 549 | struct gprs_rlcmac_sba *sba; |
| 550 | |
| 551 | if (request->ID.UnionType) { |
| 552 | struct gprs_rlcmac_ul_tbf *ul_tbf = NULL; |
| 553 | struct gprs_rlcmac_dl_tbf *dl_tbf = NULL; |
| 554 | uint32_t tlli = request->ID.u.TLLI; |
| 555 | uint8_t ms_class = 0; |
| 556 | uint8_t egprs_ms_class = 0; |
| 557 | uint8_t ta = GSM48_TA_INVALID; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 558 | |
| 559 | GprsMs *ms = bts()->ms_by_tlli(tlli); |
| 560 | /* Keep the ms, even if it gets idle temporarily */ |
| 561 | GprsMs::Guard guard(ms); |
| 562 | |
| 563 | if (ms) { |
| 564 | ul_tbf = ms->ul_tbf(); |
| 565 | dl_tbf = ms->dl_tbf(); |
| 566 | ta = ms->ta(); |
| 567 | } |
| 568 | |
| 569 | /* We got a RACH so the MS was in packet idle mode and thus |
| 570 | * didn't have any active TBFs */ |
| 571 | if (ul_tbf) { |
| 572 | LOGPTBFUL(ul_tbf, LOGL_NOTICE, |
| 573 | "Got RACH from TLLI=0x%08x while TBF still exists. Killing pending UL TBF\n", |
| 574 | tlli); |
| 575 | tbf_free(ul_tbf); |
| 576 | ul_tbf = NULL; |
| 577 | } |
| 578 | |
| 579 | if (dl_tbf) { |
| 580 | LOGPTBFUL(dl_tbf, LOGL_NOTICE, |
| 581 | "Got RACH from TLLI=0x%08x while TBF still exists. Release pending DL TBF\n", |
| 582 | tlli); |
| 583 | tbf_free(dl_tbf); |
| 584 | dl_tbf = NULL; |
| 585 | } |
| 586 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF " |
| 587 | "in packet resource request of single " |
| 588 | "block, so we provide one:\n"); |
| 589 | sba = bts()->sba()->find(this, fn); |
| 590 | if (!sba) { |
| 591 | LOGP(DRLCMAC, LOGL_NOTICE, "MS requests UL TBF " |
| 592 | "in packet resource request of single " |
| 593 | "block, but there is no resource request " |
| 594 | "scheduled!\n"); |
| 595 | } else { |
| 596 | ta = sba->ta; |
| 597 | bts()->sba()->free_sba(sba); |
| 598 | } |
| 599 | if (request->Exist_MS_Radio_Access_capability) { |
| 600 | ms_class = Decoding::get_ms_class_by_capability( |
| 601 | &request->MS_Radio_Access_capability); |
| 602 | egprs_ms_class = |
| 603 | Decoding::get_egprs_ms_class_by_capability( |
| 604 | &request->MS_Radio_Access_capability); |
| 605 | } |
| 606 | if (!ms_class) |
| 607 | LOGP(DRLCMAC, LOGL_NOTICE, "MS does not give us a class.\n"); |
| 608 | if (egprs_ms_class) |
| 609 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 610 | "MS supports EGPRS multislot class %d.\n", |
| 611 | egprs_ms_class); |
| 612 | ul_tbf = tbf_alloc_ul(bts_data(), trx_no(), ms_class, |
| 613 | egprs_ms_class, tlli, ta, ms); |
| 614 | |
| 615 | if (!ul_tbf) { |
| 616 | handle_tbf_reject(bts_data(), ms, tlli, |
| 617 | trx_no(), ts_no); |
| 618 | return; |
| 619 | } |
| 620 | |
| 621 | /* set control ts to current MS's TS, until assignment complete */ |
Pau Espin Pedrol | 506eb23 | 2019-12-24 13:02:48 +0100 | [diff] [blame] | 622 | LOGPTBF(ul_tbf, LOGL_DEBUG, "change control TS %d -> %d until assignment is complete.\n", |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 623 | ul_tbf->control_ts, ts_no); |
| 624 | |
| 625 | ul_tbf->control_ts = ts_no; |
| 626 | /* schedule uplink assignment */ |
| 627 | TBF_SET_ASS_STATE_UL(ul_tbf, GPRS_RLCMAC_UL_ASS_SEND_ASS); |
| 628 | |
| 629 | /* get capabilities */ |
| 630 | if (ul_tbf->ms()) |
| 631 | ul_tbf->ms()->set_egprs_ms_class(egprs_ms_class); |
| 632 | |
| 633 | /* get measurements */ |
| 634 | if (ul_tbf->ms()) { |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 635 | get_meas(meas, request); |
| 636 | ul_tbf->ms()->update_l1_meas(meas); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 637 | } |
| 638 | return; |
| 639 | } |
| 640 | |
| 641 | if (request->ID.u.Global_TFI.UnionType) { |
| 642 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
| 643 | int8_t tfi = request->ID.u.Global_TFI.u.DOWNLINK_TFI; |
| 644 | dl_tbf = bts()->dl_tbf_by_tfi(tfi, trx_no(), ts_no); |
| 645 | if (!dl_tbf) { |
Thorsten Alteholz | 8bb7904 | 2018-10-06 10:42:58 +0200 | [diff] [blame] | 646 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESOURCE REQ unknown downlink TFI=%d\n", tfi); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 647 | return; |
| 648 | } |
| 649 | LOGPTBFDL(dl_tbf, LOGL_ERROR, |
| 650 | "RX: [PCU <- BTS] FIXME: Packet resource request\n"); |
| 651 | |
| 652 | /* Reset N3101 counter: */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 653 | dl_tbf->n_reset(N3101); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 654 | } else { |
| 655 | struct gprs_rlcmac_ul_tbf *ul_tbf; |
| 656 | int8_t tfi = request->ID.u.Global_TFI.u.UPLINK_TFI; |
| 657 | ul_tbf = bts()->ul_tbf_by_tfi(tfi, trx_no(), ts_no); |
| 658 | if (!ul_tbf) { |
Thorsten Alteholz | 8bb7904 | 2018-10-06 10:42:58 +0200 | [diff] [blame] | 659 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESOURCE REQ unknown uplink TFI=%d\n", tfi); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 660 | return; |
| 661 | } |
| 662 | LOGPTBFUL(ul_tbf, LOGL_ERROR, |
| 663 | "RX: [PCU <- BTS] FIXME: Packet resource request\n"); |
| 664 | |
| 665 | /* Reset N3101 counter: */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 666 | ul_tbf->n_reset(N3101); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 667 | } |
| 668 | } |
| 669 | |
| 670 | void gprs_rlcmac_pdch::rcv_measurement_report(Packet_Measurement_Report_t *report, uint32_t fn) |
| 671 | { |
| 672 | struct gprs_rlcmac_sba *sba; |
| 673 | |
| 674 | sba = bts()->sba()->find(this, fn); |
| 675 | if (!sba) { |
| 676 | LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement " |
| 677 | "in packet resource request of single " |
| 678 | "block, but there is no resource request " |
| 679 | "scheduled! TLLI=0x%08x\n", report->TLLI); |
| 680 | } else { |
| 681 | GprsMs *ms = bts()->ms_store().get_ms(report->TLLI); |
| 682 | if (!ms) |
| 683 | LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement " |
| 684 | "but TLLI 0x%08x is unknown\n", report->TLLI); |
| 685 | else |
| 686 | ms->set_ta(sba->ta); |
| 687 | |
| 688 | bts()->sba()->free_sba(sba); |
| 689 | } |
| 690 | gprs_rlcmac_meas_rep(report); |
| 691 | } |
| 692 | |
| 693 | /* Received Uplink RLC control block. */ |
Pau Espin Pedrol | 812d466 | 2019-09-25 13:35:11 +0200 | [diff] [blame] | 694 | int gprs_rlcmac_pdch::rcv_control_block(const uint8_t *data, uint8_t data_len, |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 695 | uint32_t fn, struct pcu_l1_meas *meas, GprsCodingScheme cs) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 696 | { |
Pau Espin Pedrol | 812d466 | 2019-09-25 13:35:11 +0200 | [diff] [blame] | 697 | bitvec *rlc_block; |
| 698 | RlcMacUplink_t *ul_control_block; |
| 699 | unsigned len = cs.maxBytesUL(); |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 700 | int rc; |
Pau Espin Pedrol | 812d466 | 2019-09-25 13:35:11 +0200 | [diff] [blame] | 701 | |
| 702 | if (!(rlc_block = bitvec_alloc(len, tall_pcu_ctx))) |
| 703 | return -ENOMEM; |
| 704 | bitvec_unpack(rlc_block, data); |
| 705 | ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t); |
| 706 | |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 707 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n"); |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 708 | rc = decode_gsm_rlcmac_uplink(rlc_block, ul_control_block); |
| 709 | if(rc < 0) { |
| 710 | LOGP(DRLCMACUL, LOGL_ERROR, "Dropping Uplink Control Block with invalid " |
| 711 | "content, decode failed: %d)\n", rc); |
| 712 | goto free_ret; |
| 713 | } |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 714 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n"); |
| 715 | |
| 716 | if (ul_control_block->u.MESSAGE_TYPE == MT_PACKET_UPLINK_DUMMY_CONTROL_BLOCK) |
| 717 | bts()->send_gsmtap(PCU_GSMTAP_C_UL_DUMMY, true, trx_no(), ts_no, GSMTAP_CHANNEL_PACCH, fn, data, data_len); |
| 718 | else |
| 719 | bts()->send_gsmtap(PCU_GSMTAP_C_UL_CTRL, true, trx_no(), ts_no, GSMTAP_CHANNEL_PACCH, fn, data, data_len); |
| 720 | |
| 721 | bts()->rlc_rcvd_control(); |
| 722 | switch (ul_control_block->u.MESSAGE_TYPE) { |
| 723 | case MT_PACKET_CONTROL_ACK: |
| 724 | rcv_control_ack(&ul_control_block->u.Packet_Control_Acknowledgement, fn); |
| 725 | break; |
| 726 | case MT_PACKET_DOWNLINK_ACK_NACK: |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 727 | rcv_control_dl_ack_nack(&ul_control_block->u.Packet_Downlink_Ack_Nack, fn, meas); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 728 | break; |
| 729 | case MT_EGPRS_PACKET_DOWNLINK_ACK_NACK: |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 730 | rcv_control_egprs_dl_ack_nack(&ul_control_block->u.Egprs_Packet_Downlink_Ack_Nack, fn, meas); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 731 | break; |
| 732 | case MT_PACKET_RESOURCE_REQUEST: |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 733 | rcv_resource_request(&ul_control_block->u.Packet_Resource_Request, fn, meas); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 734 | break; |
| 735 | case MT_PACKET_MEASUREMENT_REPORT: |
| 736 | rcv_measurement_report(&ul_control_block->u.Packet_Measurement_Report, fn); |
| 737 | break; |
| 738 | case MT_PACKET_UPLINK_DUMMY_CONTROL_BLOCK: |
| 739 | /* ignoring it. change the SI to not force sending these? */ |
| 740 | break; |
| 741 | default: |
| 742 | bts()->decode_error(); |
| 743 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 744 | "RX: [PCU <- BTS] unknown control block(%d) received\n", |
| 745 | ul_control_block->u.MESSAGE_TYPE); |
| 746 | } |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 747 | free_ret: |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 748 | talloc_free(ul_control_block); |
Pau Espin Pedrol | 812d466 | 2019-09-25 13:35:11 +0200 | [diff] [blame] | 749 | bitvec_free(rlc_block); |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 750 | return rc; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 751 | } |
| 752 | |
| 753 | /* received RLC/MAC block from L1 */ |
| 754 | int gprs_rlcmac_pdch::rcv_block(uint8_t *data, uint8_t len, uint32_t fn, |
| 755 | struct pcu_l1_meas *meas) |
| 756 | { |
| 757 | GprsCodingScheme cs = GprsCodingScheme::getBySizeUL(len); |
| 758 | if (!cs) { |
| 759 | bts()->decode_error(); |
| 760 | LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid" |
| 761 | "length: %d)\n", len); |
| 762 | return -EINVAL; |
| 763 | } |
| 764 | |
| 765 | bts()->rlc_ul_bytes(len); |
| 766 | |
| 767 | LOGP(DRLCMACUL, LOGL_DEBUG, "Got RLC block, coding scheme: %s, " |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 768 | "length: %d (%d))\n", mcs_name(cs), len, cs.usedSizeUL()); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 769 | |
Max | 8a8e0fb | 2019-03-25 16:32:50 +0100 | [diff] [blame] | 770 | if (mcs_is_gprs(cs)) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 771 | return rcv_block_gprs(data, len, fn, meas, cs); |
| 772 | |
Max | 8a8e0fb | 2019-03-25 16:32:50 +0100 | [diff] [blame] | 773 | if (mcs_is_edge(cs)) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 774 | return rcv_data_block(data, len, fn, meas, cs); |
| 775 | |
| 776 | bts()->decode_error(); |
| 777 | LOGP(DRLCMACUL, LOGL_ERROR, "Unsupported coding scheme %s\n", |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 778 | mcs_name(cs)); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 779 | return -EINVAL; |
| 780 | } |
| 781 | |
| 782 | /*! \brief process egprs and gprs data blocks */ |
| 783 | int gprs_rlcmac_pdch::rcv_data_block(uint8_t *data, uint8_t data_len, uint32_t fn, |
| 784 | struct pcu_l1_meas *meas, GprsCodingScheme cs) |
| 785 | { |
| 786 | int rc; |
| 787 | struct gprs_rlc_data_info rlc_dec; |
| 788 | struct gprs_rlcmac_ul_tbf *tbf; |
| 789 | unsigned len = cs.sizeUL(); |
| 790 | |
| 791 | /* These are always data blocks, since EGPRS still uses CS-1 for |
| 792 | * control blocks (see 44.060, section 10.3, 1st par.) |
| 793 | */ |
Max | 8a8e0fb | 2019-03-25 16:32:50 +0100 | [diff] [blame] | 794 | if (mcs_is_edge(cs)) { |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 795 | if (!bts()->bts_data()->egprs_enabled) { |
| 796 | LOGP(DRLCMACUL, LOGL_ERROR, |
| 797 | "Got %s RLC block but EGPRS is not enabled\n", |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 798 | mcs_name(cs)); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 799 | return -EINVAL; |
| 800 | } |
| 801 | bts()->send_gsmtap(PCU_GSMTAP_C_UL_DATA_EGPRS, true, trx_no(), ts_no, GSMTAP_CHANNEL_PDTCH, fn, |
| 802 | data, data_len); |
| 803 | } else { |
| 804 | bts()->send_gsmtap(PCU_GSMTAP_C_UL_DATA_GPRS, true, trx_no(), ts_no, GSMTAP_CHANNEL_PDTCH, fn, |
| 805 | data, data_len); |
| 806 | } |
| 807 | |
| 808 | LOGP(DRLCMACUL, LOGL_DEBUG, " UL data: %s\n", osmo_hexdump(data, len)); |
| 809 | |
| 810 | rc = Decoding::rlc_parse_ul_data_header(&rlc_dec, data, cs); |
| 811 | if (rc < 0) { |
| 812 | LOGP(DRLCMACUL, LOGL_ERROR, |
| 813 | "Got %s RLC block but header parsing has failed\n", |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 814 | mcs_name(cs)); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 815 | bts()->decode_error(); |
| 816 | return rc; |
| 817 | } |
| 818 | |
| 819 | LOGP(DRLCMACUL, LOGL_INFO, |
| 820 | "Got %s RLC block: " |
| 821 | "R=%d, SI=%d, TFI=%d, CPS=%d, RSB=%d, " |
| 822 | "rc=%d\n", |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 823 | mcs_name(cs), |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 824 | rlc_dec.r, rlc_dec.si, rlc_dec.tfi, rlc_dec.cps, rlc_dec.rsb, |
| 825 | rc); |
| 826 | |
| 827 | /* find TBF inst from given TFI */ |
| 828 | tbf = ul_tbf_by_tfi(rlc_dec.tfi); |
| 829 | if (!tbf) { |
| 830 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TFI=%d\n", |
| 831 | rlc_dec.tfi); |
| 832 | return 0; |
| 833 | } |
| 834 | |
| 835 | /* Reset N3101 counter: */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 836 | tbf->n_reset(N3101); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 837 | |
| 838 | return tbf->rcv_data_block_acknowledged(&rlc_dec, data, meas); |
| 839 | } |
| 840 | |
| 841 | int gprs_rlcmac_pdch::rcv_block_gprs(uint8_t *data, uint8_t data_len, uint32_t fn, |
| 842 | struct pcu_l1_meas *meas, GprsCodingScheme cs) |
| 843 | { |
| 844 | unsigned payload = data[0] >> 6; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 845 | int rc = 0; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 846 | |
| 847 | switch (payload) { |
| 848 | case GPRS_RLCMAC_DATA_BLOCK: |
| 849 | rc = rcv_data_block(data, data_len, fn, meas, cs); |
| 850 | break; |
| 851 | case GPRS_RLCMAC_CONTROL_BLOCK: |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 852 | rc = rcv_control_block(data, data_len, fn, meas, cs); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 853 | break; |
| 854 | case GPRS_RLCMAC_CONTROL_BLOCK_OPT: |
| 855 | LOGP(DRLCMAC, LOGL_NOTICE, "GPRS_RLCMAC_CONTROL_BLOCK_OPT block payload is not supported.\n"); |
| 856 | break; |
| 857 | default: |
| 858 | LOGP(DRLCMAC, LOGL_NOTICE, "Unknown RLCMAC block payload(%u).\n", payload); |
| 859 | rc = -EINVAL; |
| 860 | } |
| 861 | |
| 862 | return rc; |
| 863 | } |
| 864 | |
| 865 | gprs_rlcmac_tbf *gprs_rlcmac_pdch::tbf_from_list_by_tfi( |
| 866 | LListHead<gprs_rlcmac_tbf> *tbf_list, uint8_t tfi, |
| 867 | enum gprs_rlcmac_tbf_direction dir) |
| 868 | { |
| 869 | gprs_rlcmac_tbf *tbf; |
| 870 | LListHead<gprs_rlcmac_tbf> *pos; |
| 871 | |
| 872 | llist_for_each(pos, tbf_list) { |
| 873 | tbf = pos->entry(); |
| 874 | if (tbf->tfi() != tfi) |
| 875 | continue; |
| 876 | if (!tbf->pdch[ts_no]) |
| 877 | continue; |
| 878 | return tbf; |
| 879 | } |
| 880 | return NULL; |
| 881 | } |
| 882 | |
| 883 | gprs_rlcmac_ul_tbf *gprs_rlcmac_pdch::ul_tbf_by_tfi(uint8_t tfi) |
| 884 | { |
| 885 | return as_ul_tbf(tbf_by_tfi(tfi, GPRS_RLCMAC_UL_TBF)); |
| 886 | } |
| 887 | |
| 888 | gprs_rlcmac_dl_tbf *gprs_rlcmac_pdch::dl_tbf_by_tfi(uint8_t tfi) |
| 889 | { |
| 890 | return as_dl_tbf(tbf_by_tfi(tfi, GPRS_RLCMAC_DL_TBF)); |
| 891 | } |
| 892 | |
| 893 | /* lookup TBF Entity (by TFI) */ |
| 894 | gprs_rlcmac_tbf *gprs_rlcmac_pdch::tbf_by_tfi(uint8_t tfi, |
| 895 | enum gprs_rlcmac_tbf_direction dir) |
| 896 | { |
| 897 | struct gprs_rlcmac_tbf *tbf; |
| 898 | |
| 899 | if (tfi >= 32) |
| 900 | return NULL; |
| 901 | |
| 902 | tbf = m_tbfs[dir][tfi]; |
| 903 | |
| 904 | if (!tbf) |
| 905 | return NULL; |
| 906 | |
| 907 | if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)) { |
| 908 | return tbf; |
| 909 | } |
| 910 | |
| 911 | return NULL; |
| 912 | } |
| 913 | |
| 914 | void gprs_rlcmac_pdch::attach_tbf(gprs_rlcmac_tbf *tbf) |
| 915 | { |
| 916 | gprs_rlcmac_ul_tbf *ul_tbf; |
| 917 | |
| 918 | if (m_tbfs[tbf->direction][tbf->tfi()]) |
| 919 | LOGP(DRLCMAC, LOGL_ERROR, "PDCH(TS %d, TRX %d): " |
| 920 | "%s has not been detached, overwriting it\n", |
| 921 | ts_no, trx_no(), |
| 922 | m_tbfs[tbf->direction][tbf->tfi()]->name()); |
| 923 | |
| 924 | m_num_tbfs[tbf->direction] += 1; |
| 925 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| 926 | ul_tbf = as_ul_tbf(tbf); |
| 927 | m_assigned_usf |= 1 << ul_tbf->m_usf[ts_no]; |
| 928 | } |
| 929 | m_assigned_tfi[tbf->direction] |= 1UL << tbf->tfi(); |
| 930 | m_tbfs[tbf->direction][tbf->tfi()] = tbf; |
| 931 | |
| 932 | LOGP(DRLCMAC, LOGL_INFO, "PDCH(TS %d, TRX %d): Attaching %s, %d TBFs, " |
| 933 | "USFs = %02x, TFIs = %08x.\n", |
| 934 | ts_no, trx_no(), tbf->name(), m_num_tbfs[tbf->direction], |
| 935 | m_assigned_usf, m_assigned_tfi[tbf->direction]); |
| 936 | } |
| 937 | |
| 938 | void gprs_rlcmac_pdch::detach_tbf(gprs_rlcmac_tbf *tbf) |
| 939 | { |
| 940 | gprs_rlcmac_ul_tbf *ul_tbf; |
| 941 | |
| 942 | OSMO_ASSERT(m_num_tbfs[tbf->direction] > 0); |
| 943 | |
| 944 | m_num_tbfs[tbf->direction] -= 1; |
| 945 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| 946 | ul_tbf = as_ul_tbf(tbf); |
| 947 | m_assigned_usf &= ~(1 << ul_tbf->m_usf[ts_no]); |
| 948 | } |
| 949 | m_assigned_tfi[tbf->direction] &= ~(1UL << tbf->tfi()); |
| 950 | m_tbfs[tbf->direction][tbf->tfi()] = NULL; |
| 951 | |
| 952 | LOGP(DRLCMAC, LOGL_INFO, "PDCH(TS %d, TRX %d): Detaching %s, %d TBFs, " |
| 953 | "USFs = %02x, TFIs = %08x.\n", |
| 954 | ts_no, trx_no(), tbf->name(), m_num_tbfs[tbf->direction], |
| 955 | m_assigned_usf, m_assigned_tfi[tbf->direction]); |
| 956 | } |
| 957 | |
| 958 | void gprs_rlcmac_pdch::reserve(enum gprs_rlcmac_tbf_direction dir) |
| 959 | { |
| 960 | m_num_reserved[dir] += 1; |
| 961 | } |
| 962 | |
| 963 | void gprs_rlcmac_pdch::unreserve(enum gprs_rlcmac_tbf_direction dir) |
| 964 | { |
| 965 | OSMO_ASSERT(m_num_reserved[dir] > 0); |
| 966 | m_num_reserved[dir] -= 1; |
| 967 | } |
| 968 | |
| 969 | inline BTS *gprs_rlcmac_pdch::bts() const |
| 970 | { |
| 971 | return trx->bts; |
| 972 | } |
| 973 | |
| 974 | uint8_t gprs_rlcmac_pdch::trx_no() const |
| 975 | { |
| 976 | return trx->trx_no; |
| 977 | } |
| 978 | |
| 979 | inline gprs_rlcmac_bts *gprs_rlcmac_pdch::bts_data() const |
| 980 | { |
| 981 | return trx->bts->bts_data(); |
| 982 | } |
Vadim Yanitskiy | bd0dac3 | 2019-10-05 21:57:14 +0700 | [diff] [blame] | 983 | |
| 984 | /* PTCCH (Packet Timing Advance Control Channel) */ |
| 985 | void gprs_rlcmac_pdch::init_ptcch_msg(void) |
| 986 | { |
| 987 | memset(ptcch_msg, PTCCH_TAI_FREE, PTCCH_TAI_NUM); |
| 988 | memset(ptcch_msg + PTCCH_TAI_NUM, PTCCH_PADDING, 7); |
| 989 | } |
| 990 | |
| 991 | uint8_t gprs_rlcmac_pdch::reserve_tai(uint8_t ta) |
| 992 | { |
| 993 | uint8_t tai; |
| 994 | |
| 995 | for (tai = 0; tai < PTCCH_TAI_NUM; tai++) { |
| 996 | if (ptcch_msg[tai] == PTCCH_TAI_FREE) { |
| 997 | ptcch_msg[tai] = ta; |
| 998 | return tai; |
| 999 | } |
| 1000 | } |
| 1001 | |
| 1002 | /* Special case: no free TAI available */ |
| 1003 | return PTCCH_TAI_FREE; |
| 1004 | } |
| 1005 | |
| 1006 | void gprs_rlcmac_pdch::release_tai(uint8_t tai) |
| 1007 | { |
| 1008 | OSMO_ASSERT(tai < PTCCH_TAI_NUM); |
| 1009 | ptcch_msg[tai] = PTCCH_TAI_FREE; |
| 1010 | } |
| 1011 | |
| 1012 | void gprs_rlcmac_pdch::update_ta(uint8_t tai, uint8_t ta) |
| 1013 | { |
| 1014 | OSMO_ASSERT(tai < PTCCH_TAI_NUM); |
| 1015 | ptcch_msg[tai] = ta; |
| 1016 | } |