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> |
Pau Espin Pedrol | 2ae8337 | 2020-05-18 11:35:35 +0200 | [diff] [blame] | 28 | #include <coding_scheme.h> |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 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> |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 37 | |
| 38 | extern "C" { |
Pau Espin Pedrol | 980ef1e | 2020-03-26 15:06:11 +0100 | [diff] [blame] | 39 | #include <osmocom/core/talloc.h> |
| 40 | #include <osmocom/core/msgb.h> |
Vadim Yanitskiy | d71c566 | 2020-03-26 15:45:21 +0700 | [diff] [blame] | 41 | #include <osmocom/gsm/gsm48.h> |
Pau Espin Pedrol | 980ef1e | 2020-03-26 15:06:11 +0100 | [diff] [blame] | 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> |
Pau Espin Pedrol | b2653fe | 2020-03-26 15:14:01 +0100 | [diff] [blame] | 47 | |
Pau Espin Pedrol | 980ef1e | 2020-03-26 15:06:11 +0100 | [diff] [blame] | 48 | #include "coding_scheme.h" |
Pau Espin Pedrol | b2653fe | 2020-03-26 15:14:01 +0100 | [diff] [blame] | 49 | #include "gsm_rlcmac.h" |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | #include <errno.h> |
Vadim Yanitskiy | bd0dac3 | 2019-10-05 21:57:14 +0700 | [diff] [blame] | 53 | #include <stdlib.h> |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 54 | #include <arpa/inet.h> |
| 55 | |
| 56 | extern void *tall_pcu_ctx; |
| 57 | |
| 58 | static void get_rx_qual_meas(struct pcu_l1_meas *meas, uint8_t rx_qual_enc) |
| 59 | { |
| 60 | static const int16_t rx_qual_map[] = { |
| 61 | 0, /* 0,14 % */ |
| 62 | 0, /* 0,28 % */ |
| 63 | 1, /* 0,57 % */ |
| 64 | 1, /* 1,13 % */ |
| 65 | 2, /* 2,26 % */ |
| 66 | 5, /* 4,53 % */ |
| 67 | 9, /* 9,05 % */ |
| 68 | 18, /* 18,10 % */ |
| 69 | }; |
| 70 | |
| 71 | meas->set_ms_rx_qual(rx_qual_map[ |
| 72 | OSMO_MIN(rx_qual_enc, ARRAY_SIZE(rx_qual_map)-1) |
| 73 | ]); |
| 74 | } |
| 75 | |
| 76 | static void get_meas(struct pcu_l1_meas *meas, |
| 77 | const Packet_Resource_Request_t *qr) |
| 78 | { |
| 79 | unsigned i; |
| 80 | |
| 81 | meas->set_ms_c_value(qr->C_VALUE); |
| 82 | if (qr->Exist_SIGN_VAR) |
| 83 | meas->set_ms_sign_var((qr->SIGN_VAR + 2) / 4); /* SIGN_VAR * 0.25 dB */ |
| 84 | |
Pau Espin Pedrol | 0daf913 | 2020-02-23 16:11:28 +0700 | [diff] [blame] | 85 | for (i = 0; i < OSMO_MIN(ARRAY_SIZE(qr->I_LEVEL_TN), ARRAY_SIZE(meas->ts)); i++) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 86 | { |
Pau Espin Pedrol | 0daf913 | 2020-02-23 16:11:28 +0700 | [diff] [blame] | 87 | if (qr->I_LEVEL_TN[i].Exist) { |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 88 | LOGP(DRLCMAC, LOGL_INFO, |
| 89 | "Packet resource request: i_level[%d] = %d\n", |
Pau Espin Pedrol | 0daf913 | 2020-02-23 16:11:28 +0700 | [diff] [blame] | 90 | i, qr->I_LEVEL_TN[i].I_LEVEL); |
| 91 | meas->set_ms_i_level(i, -2 * qr->I_LEVEL_TN[i].I_LEVEL); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 92 | } |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | static void get_meas(struct pcu_l1_meas *meas, |
| 97 | const Channel_Quality_Report_t *qr) |
| 98 | { |
| 99 | unsigned i; |
| 100 | |
| 101 | get_rx_qual_meas(meas, qr->RXQUAL); |
| 102 | meas->set_ms_c_value(qr->C_VALUE); |
| 103 | meas->set_ms_sign_var((qr->SIGN_VAR + 2) / 4); /* SIGN_VAR * 0.25 dB */ |
| 104 | |
| 105 | for (i = 0; i < OSMO_MIN(ARRAY_SIZE(qr->Slot), ARRAY_SIZE(meas->ts)); i++) |
| 106 | { |
| 107 | if (qr->Slot[i].Exist) { |
| 108 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 109 | "Channel quality report: i_level[%d] = %d\n", |
| 110 | i, qr->Slot[i].I_LEVEL_TN); |
| 111 | meas->set_ms_i_level(i, -2 * qr->Slot[i].I_LEVEL_TN); |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | static inline void sched_ul_ass_or_rej(BTS *bts, gprs_rlcmac_bts *bts_data, struct gprs_rlcmac_dl_tbf *tbf) |
| 117 | { |
Pau Espin Pedrol | 2338e53 | 2020-05-12 20:54:35 +0200 | [diff] [blame] | 118 | bts->do_rate_ctr_inc(CTR_CHANNEL_REQUEST_DESCRIPTION); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 119 | |
| 120 | /* This call will register the new TBF with the MS on success */ |
Pau Espin Pedrol | 5dc6e46 | 2020-05-12 19:27:16 +0200 | [diff] [blame] | 121 | gprs_rlcmac_ul_tbf *ul_tbf = tbf_alloc_ul(bts_data, tbf->ms(), tbf->trx->trx_no, tbf->tlli()); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 122 | |
| 123 | /* schedule uplink assignment or reject */ |
| 124 | if (ul_tbf) { |
| 125 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack message, so we provide one:\n"); |
| 126 | TBF_SET_ASS_STATE_UL(tbf, GPRS_RLCMAC_UL_ASS_SEND_ASS); |
| 127 | } else { |
| 128 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack message, so we packet access reject:\n"); |
| 129 | TBF_SET_ASS_STATE_UL(tbf, GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | void gprs_rlcmac_pdch::enable() |
| 134 | { |
| 135 | /* TODO: Check if there are still allocated resources.. */ |
| 136 | INIT_LLIST_HEAD(&paging_list); |
| 137 | m_is_enabled = 1; |
| 138 | } |
| 139 | |
| 140 | void gprs_rlcmac_pdch::disable() |
| 141 | { |
| 142 | /* TODO.. kick free_resources once we know the TRX/TS we are on */ |
| 143 | m_is_enabled = 0; |
| 144 | } |
| 145 | |
| 146 | void gprs_rlcmac_pdch::free_resources() |
| 147 | { |
| 148 | struct gprs_rlcmac_paging *pag; |
| 149 | |
| 150 | /* we are not enabled. there should be no resources */ |
| 151 | if (!is_enabled()) |
| 152 | return; |
| 153 | |
| 154 | /* kick all TBF on slot */ |
| 155 | gprs_rlcmac_tbf::free_all(this); |
| 156 | |
| 157 | /* flush all pending paging messages */ |
| 158 | while ((pag = dequeue_paging())) |
| 159 | talloc_free(pag); |
| 160 | |
| 161 | trx->bts->sba()->free_resources(this); |
| 162 | } |
| 163 | |
| 164 | struct gprs_rlcmac_paging *gprs_rlcmac_pdch::dequeue_paging() |
| 165 | { |
| 166 | struct gprs_rlcmac_paging *pag; |
| 167 | |
| 168 | if (llist_empty(&paging_list)) |
| 169 | return NULL; |
| 170 | pag = llist_entry(paging_list.next, struct gprs_rlcmac_paging, list); |
| 171 | llist_del(&pag->list); |
| 172 | |
| 173 | return pag; |
| 174 | } |
| 175 | |
| 176 | struct msgb *gprs_rlcmac_pdch::packet_paging_request() |
| 177 | { |
| 178 | struct gprs_rlcmac_paging *pag; |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 179 | RlcMacDownlink_t *mac_control_block; |
| 180 | bitvec *pag_vec; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 181 | struct msgb *msg; |
| 182 | unsigned wp = 0, len; |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 183 | int rc; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 184 | |
| 185 | /* no paging, no message */ |
| 186 | pag = dequeue_paging(); |
| 187 | if (!pag) |
| 188 | return NULL; |
| 189 | |
| 190 | LOGP(DRLCMAC, LOGL_DEBUG, "Scheduling paging\n"); |
| 191 | |
| 192 | /* alloc message */ |
| 193 | msg = msgb_alloc(23, "pag ctrl block"); |
| 194 | if (!msg) { |
| 195 | talloc_free(pag); |
| 196 | return NULL; |
| 197 | } |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 198 | pag_vec = bitvec_alloc(23, tall_pcu_ctx); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 199 | if (!pag_vec) { |
| 200 | msgb_free(msg); |
| 201 | talloc_free(pag); |
| 202 | return NULL; |
| 203 | } |
| 204 | wp = Encoding::write_packet_paging_request(pag_vec); |
| 205 | |
| 206 | /* loop until message is full */ |
| 207 | while (pag) { |
Vadim Yanitskiy | d71c566 | 2020-03-26 15:45:21 +0700 | [diff] [blame] | 208 | LOGP(DRLCMAC, LOGL_DEBUG, "Paging MI - %s\n", |
| 209 | osmo_mi_name(pag->identity_lv + 1, pag->identity_lv[0])); |
| 210 | |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 211 | /* try to add paging */ |
Vadim Yanitskiy | ce16014 | 2020-03-26 16:18:17 +0700 | [diff] [blame] | 212 | if ((pag->identity_lv[1] & GSM_MI_TYPE_MASK) == GSM_MI_TYPE_TMSI) { |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 213 | /* TMSI */ |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 214 | len = 1 + 1 + 1 + 32 + 2 + 1; |
| 215 | if (pag->identity_lv[0] != 5) { |
| 216 | LOGP(DRLCMAC, LOGL_ERROR, "TMSI paging with " |
| 217 | "MI != 5 octets!\n"); |
| 218 | goto continue_next; |
| 219 | } |
| 220 | } else { |
| 221 | /* MI */ |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 222 | len = 1 + 1 + 1 + 4 + (pag->identity_lv[0]<<3) + 2 + 1; |
| 223 | if (pag->identity_lv[0] > 8) { |
| 224 | LOGP(DRLCMAC, LOGL_ERROR, "Paging with " |
| 225 | "MI > 8 octets!\n"); |
| 226 | goto continue_next; |
| 227 | } |
| 228 | } |
| 229 | if (wp + len > 184) { |
| 230 | LOGP(DRLCMAC, LOGL_DEBUG, "- Does not fit, so schedule " |
| 231 | "next time\n"); |
| 232 | /* put back paging record, because does not fit */ |
| 233 | llist_add_tail(&pag->list, &paging_list); |
| 234 | break; |
| 235 | } |
| 236 | Encoding::write_repeated_page_info(pag_vec, wp, pag->identity_lv[0], |
| 237 | pag->identity_lv + 1, pag->chan_needed); |
| 238 | |
| 239 | continue_next: |
| 240 | talloc_free(pag); |
| 241 | pag = dequeue_paging(); |
| 242 | } |
| 243 | |
| 244 | bitvec_pack(pag_vec, msgb_put(msg, 23)); |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 245 | mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 246 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Paging Request +++++++++++++++++++++++++\n"); |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 247 | rc = decode_gsm_rlcmac_downlink(pag_vec, mac_control_block); |
| 248 | if (rc < 0) { |
| 249 | LOGP(DRLCMAC, LOGL_ERROR, "Decoding of Downlink Packet Paging Request failed (%d)\n", rc); |
| 250 | goto free_ret; |
| 251 | } |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 252 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Paging Request -------------------------\n"); |
| 253 | bitvec_free(pag_vec); |
| 254 | talloc_free(mac_control_block); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 255 | return msg; |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 256 | |
| 257 | free_ret: |
| 258 | bitvec_free(pag_vec); |
| 259 | talloc_free(mac_control_block); |
| 260 | msgb_free(msg); |
| 261 | return NULL; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 262 | } |
| 263 | |
Pau Espin Pedrol | fbfab29 | 2019-12-23 13:19:25 +0100 | [diff] [blame] | 264 | 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] | 265 | { |
| 266 | struct gprs_rlcmac_paging *pag = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_paging); |
| 267 | if (!pag) |
| 268 | return false; |
| 269 | |
| 270 | pag->chan_needed = chan_needed; |
Pau Espin Pedrol | fbfab29 | 2019-12-23 13:19:25 +0100 | [diff] [blame] | 271 | pag->identity_lv[0] = mi_len; |
| 272 | memcpy(&pag->identity_lv[1], mi, mi_len); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 273 | |
| 274 | llist_add(&pag->list, &paging_list); |
| 275 | |
| 276 | return true; |
| 277 | } |
| 278 | |
| 279 | void gprs_rlcmac_pdch::rcv_control_ack(Packet_Control_Acknowledgement_t *packet, uint32_t fn) |
| 280 | { |
| 281 | struct gprs_rlcmac_tbf *tbf, *new_tbf; |
| 282 | uint32_t tlli = packet->TLLI; |
| 283 | GprsMs *ms = bts()->ms_by_tlli(tlli); |
| 284 | gprs_rlcmac_ul_tbf *ul_tbf; |
| 285 | |
| 286 | tbf = bts()->ul_tbf_by_poll_fn(fn, trx_no(), ts_no); |
| 287 | if (!tbf) |
| 288 | tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no); |
| 289 | |
| 290 | if (!tbf) { |
| 291 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " |
| 292 | "unknown FN=%u TLLI=0x%08x (TRX %d TS %d)\n", |
| 293 | fn, tlli, trx_no(), ts_no); |
| 294 | if (ms) |
| 295 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " |
| 296 | "unknown TBF corresponds to MS with IMSI %s, TA %d, " |
| 297 | "uTBF (TFI=%d, state=%s), dTBF (TFI=%d, state=%s)\n", |
| 298 | ms->imsi(), ms->ta(), |
| 299 | ms->ul_tbf() ? ms->ul_tbf()->tfi() : 0, |
| 300 | ms->ul_tbf() ? ms->ul_tbf()->state_name() : "None", |
| 301 | ms->dl_tbf() ? ms->dl_tbf()->tfi() : 0, |
| 302 | ms->dl_tbf() ? ms->dl_tbf()->state_name() : "None"); |
| 303 | return; |
| 304 | } |
| 305 | |
| 306 | /* Reset N3101 counter: */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 307 | tbf->n_reset(N3101); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 308 | |
| 309 | tbf->update_ms(tlli, GPRS_RLCMAC_UL_TBF); |
| 310 | |
| 311 | LOGPTBF(tbf, LOGL_DEBUG, "RX: [PCU <- BTS] Packet Control Ack\n"); |
| 312 | TBF_POLL_SCHED_UNSET(tbf); |
| 313 | |
| 314 | /* check if this control ack belongs to packet uplink ack */ |
| 315 | ul_tbf = as_ul_tbf(tbf); |
| 316 | if (ul_tbf && ul_tbf->handle_ctrl_ack()) { |
| 317 | LOGPTBF(tbf, LOGL_DEBUG, "[UPLINK] END\n"); |
| 318 | if (ul_tbf->ctrl_ack_to_toggle()) |
| 319 | LOGPTBF(tbf, LOGL_NOTICE, "Recovered uplink ack for UL\n"); |
| 320 | |
| 321 | tbf_free(tbf); |
| 322 | return; |
| 323 | } |
| 324 | if (tbf->dl_ass_state_is(GPRS_RLCMAC_DL_ASS_WAIT_ACK)) { |
| 325 | LOGPTBF(tbf, LOGL_DEBUG, "[UPLINK] DOWNLINK ASSIGNED\n"); |
| 326 | /* reset N3105 */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 327 | tbf->n_reset(N3105); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 328 | TBF_SET_ASS_STATE_DL(tbf, GPRS_RLCMAC_DL_ASS_NONE); |
| 329 | |
| 330 | new_tbf = tbf->ms() ? tbf->ms()->dl_tbf() : NULL; |
| 331 | if (!new_tbf) { |
| 332 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL " |
| 333 | "TBF is gone TLLI=0x%08x\n", tlli); |
| 334 | return; |
| 335 | } |
| 336 | if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE) && |
| 337 | tbf->direction == new_tbf->direction) |
| 338 | tbf_free(tbf); |
| 339 | |
| 340 | if (new_tbf->check_n_clear(GPRS_RLCMAC_FLAG_CCCH)) { |
| 341 | /* We now know that the PACCH really existed */ |
| 342 | LOGPTBF(new_tbf, LOGL_INFO, |
| 343 | "The TBF has been confirmed on the PACCH, " |
| 344 | "changed type from CCCH to PACCH\n"); |
| 345 | TBF_ASS_TYPE_SET(new_tbf, GPRS_RLCMAC_FLAG_PACCH); |
| 346 | } |
| 347 | TBF_SET_STATE(new_tbf, GPRS_RLCMAC_FLOW); |
| 348 | /* stop pending assignment timer */ |
| 349 | new_tbf->t_stop(T0, "control acked (DL-TBF)"); |
| 350 | if (new_tbf->check_n_clear(GPRS_RLCMAC_FLAG_TO_DL_ASS)) |
| 351 | LOGPTBF(new_tbf, LOGL_NOTICE, "Recovered downlink assignment\n"); |
| 352 | |
| 353 | tbf_assign_control_ts(new_tbf); |
| 354 | return; |
| 355 | } |
| 356 | if (tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_WAIT_ACK)) { |
| 357 | LOGPTBF(tbf, LOGL_DEBUG, "[DOWNLINK] UPLINK ASSIGNED\n"); |
| 358 | /* reset N3105 */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 359 | tbf->n_reset(N3105); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 360 | TBF_SET_ASS_STATE_UL(tbf, GPRS_RLCMAC_UL_ASS_NONE); |
| 361 | |
| 362 | new_tbf = tbf->ms() ? tbf->ms()->ul_tbf() : NULL; |
| 363 | if (!new_tbf) { |
| 364 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL " |
| 365 | "TBF is gone TLLI=0x%08x\n", tlli); |
| 366 | return; |
| 367 | } |
| 368 | if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE) && |
| 369 | tbf->direction == new_tbf->direction) |
| 370 | tbf_free(tbf); |
| 371 | |
| 372 | TBF_SET_STATE(new_tbf, GPRS_RLCMAC_FLOW); |
| 373 | if (new_tbf->check_n_clear(GPRS_RLCMAC_FLAG_TO_UL_ASS)) |
| 374 | LOGPTBF(new_tbf, LOGL_NOTICE, "Recovered uplink assignment for UL\n"); |
| 375 | |
| 376 | tbf_assign_control_ts(new_tbf); |
| 377 | /* there might be LLC packets waiting in the queue, but the DL |
| 378 | * TBF might have been released while the UL TBF has been |
| 379 | * established */ |
| 380 | if (new_tbf->ms()->need_dl_tbf()) |
| 381 | new_tbf->establish_dl_tbf_on_pacch(); |
| 382 | |
| 383 | return; |
| 384 | } |
| 385 | LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK " |
| 386 | "at no request\n"); |
| 387 | } |
| 388 | |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 389 | 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] | 390 | { |
| 391 | int8_t tfi = 0; /* must be signed */ |
| 392 | struct gprs_rlcmac_dl_tbf *tbf; |
| 393 | int rc; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 394 | int num_blocks; |
| 395 | uint8_t bits_data[RLC_GPRS_WS/8]; |
| 396 | bitvec bits; |
| 397 | int bsn_begin, bsn_end; |
| 398 | char show_bits[RLC_GPRS_WS + 1]; |
| 399 | |
| 400 | tfi = ack_nack->DOWNLINK_TFI; |
| 401 | tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no); |
| 402 | if (!tbf) { |
| 403 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
| 404 | "unknown FN=%u TFI=%d (TRX %d TS %d)\n", |
| 405 | fn, tfi, trx_no(), ts_no); |
| 406 | return; |
| 407 | } |
| 408 | if (tbf->tfi() != tfi) { |
| 409 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
| 410 | "wrong TFI=%d, ignoring!\n", tfi); |
| 411 | return; |
| 412 | } |
| 413 | |
| 414 | /* Reset N3101 counter: */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 415 | tbf->n_reset(N3101); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 416 | |
| 417 | if (tbf->handle_ack_nack()) |
| 418 | LOGPTBF(tbf, LOGL_NOTICE, "Recovered downlink ack\n"); |
| 419 | |
| 420 | LOGPTBF(tbf, LOGL_DEBUG, "RX: [PCU <- BTS] Packet Downlink Ack/Nack\n"); |
| 421 | |
| 422 | bits.data = bits_data; |
| 423 | bits.data_len = sizeof(bits_data); |
| 424 | bits.cur_bit = 0; |
| 425 | |
| 426 | num_blocks = Decoding::decode_gprs_acknack_bits( |
| 427 | &ack_nack->Ack_Nack_Description, &bits, |
| 428 | &bsn_begin, &bsn_end, tbf->window()); |
| 429 | |
| 430 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 431 | "Got GPRS DL ACK bitmap: SSN: %d, BSN %d to %d - 1 (%d blocks), " |
| 432 | "\"%s\"\n", |
| 433 | ack_nack->Ack_Nack_Description.STARTING_SEQUENCE_NUMBER, |
| 434 | bsn_begin, bsn_end, num_blocks, |
| 435 | (Decoding::extract_rbb(&bits, show_bits), show_bits)); |
| 436 | |
| 437 | rc = tbf->rcvd_dl_ack( |
| 438 | ack_nack->Ack_Nack_Description.FINAL_ACK_INDICATION, |
| 439 | bsn_begin, &bits); |
| 440 | if (rc == 1) { |
| 441 | tbf_free(tbf); |
| 442 | return; |
| 443 | } |
| 444 | /* check for channel request */ |
| 445 | if (ack_nack->Exist_Channel_Request_Description) |
| 446 | sched_ul_ass_or_rej(bts(), bts_data(), tbf); |
| 447 | |
| 448 | /* get measurements */ |
| 449 | if (tbf->ms()) { |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 450 | get_meas(meas, &ack_nack->Channel_Quality_Report); |
| 451 | tbf->ms()->update_l1_meas(meas); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 452 | } |
| 453 | } |
| 454 | |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 455 | 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] | 456 | { |
| 457 | int8_t tfi = 0; /* must be signed */ |
| 458 | struct gprs_rlcmac_dl_tbf *tbf; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 459 | int rc; |
| 460 | int num_blocks; |
| 461 | uint8_t bits_data[RLC_EGPRS_MAX_WS/8]; |
| 462 | char show_bits[RLC_EGPRS_MAX_WS + 1]; |
| 463 | bitvec bits; |
| 464 | int bsn_begin, bsn_end; |
| 465 | |
| 466 | tfi = ack_nack->DOWNLINK_TFI; |
| 467 | tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no); |
| 468 | if (!tbf) { |
| 469 | LOGP(DRLCMAC, LOGL_NOTICE, "EGPRS PACKET DOWNLINK ACK with " |
| 470 | "unknown FN=%u TFI=%d (TRX %d TS %d)\n", |
| 471 | fn, tfi, trx_no(), ts_no); |
| 472 | return; |
| 473 | } |
| 474 | if (tbf->tfi() != tfi) { |
| 475 | LOGP(DRLCMAC, LOGL_NOTICE, "EGPRS PACKET DOWNLINK ACK with " |
| 476 | "wrong TFI=%d, ignoring!\n", tfi); |
| 477 | return; |
| 478 | } |
| 479 | |
| 480 | /* Reset N3101 counter: */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 481 | tbf->n_reset(N3101); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 482 | |
| 483 | if (tbf->handle_ack_nack()) |
| 484 | LOGPTBF(tbf, LOGL_NOTICE, "Recovered EGPRS downlink ack\n"); |
| 485 | |
| 486 | LOGPTBF(tbf, LOGL_DEBUG, |
| 487 | "RX: [PCU <- BTS] EGPRS Packet Downlink Ack/Nack\n"); |
| 488 | |
| 489 | LOGP(DRLCMAC, LOGL_DEBUG, "EGPRS ACK/NACK: " |
| 490 | "ut: %d, final: %d, bow: %d, eow: %d, ssn: %d, have_crbb: %d, " |
| 491 | "urbb_len:%d, %p, %p, %d, %d, win: %d-%d, urbb: %s\n", |
| 492 | (int)ack_nack->EGPRS_AckNack.UnionType, |
| 493 | (int)ack_nack->EGPRS_AckNack.Desc.FINAL_ACK_INDICATION, |
| 494 | (int)ack_nack->EGPRS_AckNack.Desc.BEGINNING_OF_WINDOW, |
| 495 | (int)ack_nack->EGPRS_AckNack.Desc.END_OF_WINDOW, |
| 496 | (int)ack_nack->EGPRS_AckNack.Desc.STARTING_SEQUENCE_NUMBER, |
| 497 | (int)ack_nack->EGPRS_AckNack.Desc.Exist_CRBB, |
| 498 | (int)ack_nack->EGPRS_AckNack.Desc.URBB_LENGTH, |
| 499 | (void *)&ack_nack->EGPRS_AckNack.UnionType, |
| 500 | (void *)&ack_nack->EGPRS_AckNack.Desc, |
| 501 | (int)offsetof(EGPRS_AckNack_t, Desc), |
| 502 | (int)offsetof(EGPRS_AckNack_w_len_t, Desc), |
| 503 | tbf->window()->v_a(), |
| 504 | tbf->window()->v_s(), |
| 505 | osmo_hexdump((const uint8_t *)&ack_nack->EGPRS_AckNack.Desc.URBB, |
| 506 | sizeof(ack_nack->EGPRS_AckNack.Desc.URBB))); |
| 507 | |
| 508 | bits.data = bits_data; |
| 509 | bits.data_len = sizeof(bits_data); |
| 510 | bits.cur_bit = 0; |
| 511 | |
| 512 | num_blocks = Decoding::decode_egprs_acknack_bits( |
| 513 | &ack_nack->EGPRS_AckNack.Desc, &bits, |
| 514 | &bsn_begin, &bsn_end, tbf->window()); |
| 515 | |
| 516 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 517 | "Got EGPRS DL ACK bitmap: SSN: %d, BSN %d to %d - 1 (%d blocks), " |
| 518 | "\"%s\"\n", |
| 519 | ack_nack->EGPRS_AckNack.Desc.STARTING_SEQUENCE_NUMBER, |
| 520 | bsn_begin, bsn_end, num_blocks, |
| 521 | (Decoding::extract_rbb(&bits, show_bits), show_bits) |
| 522 | ); |
| 523 | |
| 524 | rc = tbf->rcvd_dl_ack( |
| 525 | ack_nack->EGPRS_AckNack.Desc.FINAL_ACK_INDICATION, |
| 526 | bsn_begin, &bits); |
| 527 | if (rc == 1) { |
| 528 | tbf_free(tbf); |
| 529 | return; |
| 530 | } |
| 531 | |
| 532 | /* check for channel request */ |
| 533 | if (ack_nack->Exist_ChannelRequestDescription) |
| 534 | sched_ul_ass_or_rej(bts(), bts_data(), tbf); |
| 535 | |
| 536 | /* get measurements */ |
| 537 | if (tbf->ms()) { |
| 538 | /* TODO: Implement Measurements parsing for EGPRS */ |
| 539 | /* |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 540 | get_meas(meas, &ack_nack->Channel_Quality_Report); |
| 541 | tbf->ms()->update_l1_meas(meas); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 542 | */ |
| 543 | } |
| 544 | } |
| 545 | |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 546 | 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] | 547 | { |
| 548 | struct gprs_rlcmac_sba *sba; |
| 549 | |
| 550 | if (request->ID.UnionType) { |
Pau Espin Pedrol | ce60011 | 2020-05-12 19:20:10 +0200 | [diff] [blame] | 551 | struct gprs_rlcmac_ul_tbf *ul_tbf; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 552 | uint32_t tlli = request->ID.u.TLLI; |
Pau Espin Pedrol | 9e7361a | 2020-07-08 17:35:12 +0200 | [diff] [blame] | 553 | bool ms_found = true; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 554 | |
| 555 | GprsMs *ms = bts()->ms_by_tlli(tlli); |
Pau Espin Pedrol | ce60011 | 2020-05-12 19:20:10 +0200 | [diff] [blame] | 556 | if (!ms) { |
Pau Espin Pedrol | 9e7361a | 2020-07-08 17:35:12 +0200 | [diff] [blame] | 557 | ms_found = false; |
Pau Espin Pedrol | 17402a5 | 2020-05-08 17:44:33 +0200 | [diff] [blame] | 558 | ms = bts()->ms_alloc(0, 0); /* ms class updated later */ |
Pau Espin Pedrol | 5935707 | 2020-07-08 18:23:22 +0200 | [diff] [blame] | 559 | ms->set_tlli(tlli); |
Pau Espin Pedrol | ce60011 | 2020-05-12 19:20:10 +0200 | [diff] [blame] | 560 | } |
Pau Espin Pedrol | 9e7361a | 2020-07-08 17:35:12 +0200 | [diff] [blame] | 561 | ul_tbf = ms->ul_tbf(); /* hence ul_tbf may be NULL */ |
Pau Espin Pedrol | 17402a5 | 2020-05-08 17:44:33 +0200 | [diff] [blame] | 562 | |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 563 | /* Keep the ms, even if it gets idle temporarily */ |
| 564 | GprsMs::Guard guard(ms); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 565 | |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 566 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF " |
| 567 | "in packet resource request of single " |
| 568 | "block, so we provide one:\n"); |
| 569 | sba = bts()->sba()->find(this, fn); |
Pau Espin Pedrol | 9e7361a | 2020-07-08 17:35:12 +0200 | [diff] [blame] | 570 | if (sba) { |
Pau Espin Pedrol | 5dc6e46 | 2020-05-12 19:27:16 +0200 | [diff] [blame] | 571 | ms->set_ta(sba->ta); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 572 | bts()->sba()->free_sba(sba); |
Pau Espin Pedrol | 9e7361a | 2020-07-08 17:35:12 +0200 | [diff] [blame] | 573 | } else if (!ul_tbf || !ul_tbf->state_is(GPRS_RLCMAC_FINISHED)) { |
| 574 | LOGPTBFUL(ul_tbf, LOGL_NOTICE, |
| 575 | "MS requests UL TBF in PACKET RESOURCE REQ of " |
| 576 | "single block, but there is no resource request " |
| 577 | "scheduled!\n"); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 578 | } |
Pau Espin Pedrol | 9e7361a | 2020-07-08 17:35:12 +0200 | [diff] [blame] | 579 | /* else: Resource Request can be received even if not scheduled |
| 580 | by the network since it's used by MS to re-establish a new UL |
| 581 | TBF when last one has finished. */ |
| 582 | |
Pau Espin Pedrol | e50ce6e | 2020-03-23 18:49:16 +0100 | [diff] [blame] | 583 | if (request->Exist_MS_Radio_Access_capability2) { |
Pau Espin Pedrol | 17402a5 | 2020-05-08 17:44:33 +0200 | [diff] [blame] | 584 | uint8_t ms_class, egprs_ms_class; |
Pau Espin Pedrol | bcb226d | 2020-07-08 17:18:22 +0200 | [diff] [blame] | 585 | ms_class = Decoding::get_ms_class_by_capability(&request->MS_Radio_Access_capability2); |
| 586 | egprs_ms_class = Decoding::get_egprs_ms_class_by_capability(&request->MS_Radio_Access_capability2); |
| 587 | if (ms_class) |
| 588 | ms->set_ms_class(ms_class); |
| 589 | if (egprs_ms_class) |
| 590 | ms->set_egprs_ms_class(egprs_ms_class); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 591 | } |
Pau Espin Pedrol | 17402a5 | 2020-05-08 17:44:33 +0200 | [diff] [blame] | 592 | |
Pau Espin Pedrol | 9e7361a | 2020-07-08 17:35:12 +0200 | [diff] [blame] | 593 | /* Get rid of previous finished UL TBF before providing a new one */ |
| 594 | if (ms_found && ul_tbf) { |
| 595 | if (!ul_tbf->state_is(GPRS_RLCMAC_FINISHED)) |
| 596 | LOGPTBFUL(ul_tbf, LOGL_NOTICE, |
| 597 | "Got PACKET RESOURCE REQ while TBF not finished, killing pending UL TBF\n"); |
| 598 | tbf_free(ul_tbf); |
| 599 | } |
| 600 | |
Pau Espin Pedrol | 5dc6e46 | 2020-05-12 19:27:16 +0200 | [diff] [blame] | 601 | ul_tbf = tbf_alloc_ul(bts_data(), ms, trx_no(), tlli); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 602 | if (!ul_tbf) { |
| 603 | handle_tbf_reject(bts_data(), ms, tlli, |
| 604 | trx_no(), ts_no); |
| 605 | return; |
| 606 | } |
| 607 | |
| 608 | /* set control ts to current MS's TS, until assignment complete */ |
Pau Espin Pedrol | 506eb23 | 2019-12-24 13:02:48 +0100 | [diff] [blame] | 609 | 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] | 610 | ul_tbf->control_ts, ts_no); |
| 611 | |
| 612 | ul_tbf->control_ts = ts_no; |
| 613 | /* schedule uplink assignment */ |
| 614 | TBF_SET_ASS_STATE_UL(ul_tbf, GPRS_RLCMAC_UL_ASS_SEND_ASS); |
| 615 | |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 616 | /* get measurements */ |
| 617 | if (ul_tbf->ms()) { |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 618 | get_meas(meas, request); |
| 619 | ul_tbf->ms()->update_l1_meas(meas); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 620 | } |
| 621 | return; |
| 622 | } |
| 623 | |
| 624 | if (request->ID.u.Global_TFI.UnionType) { |
| 625 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
| 626 | int8_t tfi = request->ID.u.Global_TFI.u.DOWNLINK_TFI; |
| 627 | dl_tbf = bts()->dl_tbf_by_tfi(tfi, trx_no(), ts_no); |
| 628 | if (!dl_tbf) { |
Thorsten Alteholz | 8bb7904 | 2018-10-06 10:42:58 +0200 | [diff] [blame] | 629 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESOURCE REQ unknown downlink TFI=%d\n", tfi); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 630 | return; |
| 631 | } |
| 632 | LOGPTBFDL(dl_tbf, LOGL_ERROR, |
| 633 | "RX: [PCU <- BTS] FIXME: Packet resource request\n"); |
| 634 | |
| 635 | /* Reset N3101 counter: */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 636 | dl_tbf->n_reset(N3101); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 637 | } else { |
| 638 | struct gprs_rlcmac_ul_tbf *ul_tbf; |
| 639 | int8_t tfi = request->ID.u.Global_TFI.u.UPLINK_TFI; |
| 640 | ul_tbf = bts()->ul_tbf_by_tfi(tfi, trx_no(), ts_no); |
| 641 | if (!ul_tbf) { |
Thorsten Alteholz | 8bb7904 | 2018-10-06 10:42:58 +0200 | [diff] [blame] | 642 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESOURCE REQ unknown uplink TFI=%d\n", tfi); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 643 | return; |
| 644 | } |
| 645 | LOGPTBFUL(ul_tbf, LOGL_ERROR, |
| 646 | "RX: [PCU <- BTS] FIXME: Packet resource request\n"); |
| 647 | |
| 648 | /* Reset N3101 counter: */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 649 | ul_tbf->n_reset(N3101); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 650 | } |
| 651 | } |
| 652 | |
| 653 | void gprs_rlcmac_pdch::rcv_measurement_report(Packet_Measurement_Report_t *report, uint32_t fn) |
| 654 | { |
| 655 | struct gprs_rlcmac_sba *sba; |
| 656 | |
| 657 | sba = bts()->sba()->find(this, fn); |
| 658 | if (!sba) { |
| 659 | LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement " |
| 660 | "in packet resource request of single " |
| 661 | "block, but there is no resource request " |
| 662 | "scheduled! TLLI=0x%08x\n", report->TLLI); |
| 663 | } else { |
| 664 | GprsMs *ms = bts()->ms_store().get_ms(report->TLLI); |
| 665 | if (!ms) |
| 666 | LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement " |
| 667 | "but TLLI 0x%08x is unknown\n", report->TLLI); |
| 668 | else |
| 669 | ms->set_ta(sba->ta); |
| 670 | |
| 671 | bts()->sba()->free_sba(sba); |
| 672 | } |
| 673 | gprs_rlcmac_meas_rep(report); |
| 674 | } |
| 675 | |
| 676 | /* Received Uplink RLC control block. */ |
Pau Espin Pedrol | 812d466 | 2019-09-25 13:35:11 +0200 | [diff] [blame] | 677 | int gprs_rlcmac_pdch::rcv_control_block(const uint8_t *data, uint8_t data_len, |
Pau Espin Pedrol | 2ae8337 | 2020-05-18 11:35:35 +0200 | [diff] [blame] | 678 | uint32_t fn, struct pcu_l1_meas *meas, enum CodingScheme cs) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 679 | { |
Pau Espin Pedrol | 812d466 | 2019-09-25 13:35:11 +0200 | [diff] [blame] | 680 | bitvec *rlc_block; |
| 681 | RlcMacUplink_t *ul_control_block; |
Pau Espin Pedrol | 2ae8337 | 2020-05-18 11:35:35 +0200 | [diff] [blame] | 682 | unsigned len = mcs_max_bytes_ul(cs); |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 683 | int rc; |
Pau Espin Pedrol | 812d466 | 2019-09-25 13:35:11 +0200 | [diff] [blame] | 684 | |
| 685 | if (!(rlc_block = bitvec_alloc(len, tall_pcu_ctx))) |
| 686 | return -ENOMEM; |
| 687 | bitvec_unpack(rlc_block, data); |
| 688 | ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t); |
| 689 | |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 690 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n"); |
Keith | 6fd8ffb | 2020-03-05 19:48:24 -0600 | [diff] [blame] | 691 | |
Keith | 2b6acd8 | 2020-03-26 16:33:59 -0500 | [diff] [blame] | 692 | rc = decode_gsm_rlcmac_uplink(rlc_block, ul_control_block); |
Keith | 6fd8ffb | 2020-03-05 19:48:24 -0600 | [diff] [blame] | 693 | if (ul_control_block->u.MESSAGE_TYPE == MT_PACKET_UPLINK_DUMMY_CONTROL_BLOCK) |
Pau Espin Pedrol | 0b0391f | 2020-05-19 17:23:23 +0200 | [diff] [blame] | 694 | bts()->send_gsmtap_meas(PCU_GSMTAP_C_UL_DUMMY, true, trx_no(), ts_no, GSMTAP_CHANNEL_PACCH, fn, data, data_len, meas); |
Keith | 6fd8ffb | 2020-03-05 19:48:24 -0600 | [diff] [blame] | 695 | else |
Pau Espin Pedrol | 0b0391f | 2020-05-19 17:23:23 +0200 | [diff] [blame] | 696 | bts()->send_gsmtap_meas(PCU_GSMTAP_C_UL_CTRL, true, trx_no(), ts_no, GSMTAP_CHANNEL_PACCH, fn, data, data_len, meas); |
Keith | 6fd8ffb | 2020-03-05 19:48:24 -0600 | [diff] [blame] | 697 | |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 698 | if(rc < 0) { |
| 699 | LOGP(DRLCMACUL, LOGL_ERROR, "Dropping Uplink Control Block with invalid " |
| 700 | "content, decode failed: %d)\n", rc); |
| 701 | goto free_ret; |
| 702 | } |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 703 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n"); |
| 704 | |
Pau Espin Pedrol | 2338e53 | 2020-05-12 20:54:35 +0200 | [diff] [blame] | 705 | bts()->do_rate_ctr_inc(CTR_RLC_RECV_CONTROL); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 706 | switch (ul_control_block->u.MESSAGE_TYPE) { |
| 707 | case MT_PACKET_CONTROL_ACK: |
| 708 | rcv_control_ack(&ul_control_block->u.Packet_Control_Acknowledgement, fn); |
| 709 | break; |
| 710 | case MT_PACKET_DOWNLINK_ACK_NACK: |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 711 | 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] | 712 | break; |
| 713 | case MT_EGPRS_PACKET_DOWNLINK_ACK_NACK: |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 714 | 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] | 715 | break; |
| 716 | case MT_PACKET_RESOURCE_REQUEST: |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 717 | rcv_resource_request(&ul_control_block->u.Packet_Resource_Request, fn, meas); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 718 | break; |
| 719 | case MT_PACKET_MEASUREMENT_REPORT: |
| 720 | rcv_measurement_report(&ul_control_block->u.Packet_Measurement_Report, fn); |
| 721 | break; |
| 722 | case MT_PACKET_UPLINK_DUMMY_CONTROL_BLOCK: |
| 723 | /* ignoring it. change the SI to not force sending these? */ |
| 724 | break; |
| 725 | default: |
Pau Espin Pedrol | 2338e53 | 2020-05-12 20:54:35 +0200 | [diff] [blame] | 726 | bts()->do_rate_ctr_inc(CTR_DECODE_ERRORS); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 727 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 728 | "RX: [PCU <- BTS] unknown control block(%d) received\n", |
| 729 | ul_control_block->u.MESSAGE_TYPE); |
| 730 | } |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 731 | free_ret: |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 732 | talloc_free(ul_control_block); |
Pau Espin Pedrol | 812d466 | 2019-09-25 13:35:11 +0200 | [diff] [blame] | 733 | bitvec_free(rlc_block); |
Pau Espin Pedrol | 5e300ce | 2020-02-03 17:18:03 +0100 | [diff] [blame] | 734 | return rc; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 735 | } |
| 736 | |
| 737 | /* received RLC/MAC block from L1 */ |
| 738 | int gprs_rlcmac_pdch::rcv_block(uint8_t *data, uint8_t len, uint32_t fn, |
| 739 | struct pcu_l1_meas *meas) |
| 740 | { |
Pau Espin Pedrol | 2ae8337 | 2020-05-18 11:35:35 +0200 | [diff] [blame] | 741 | enum CodingScheme cs = mcs_get_by_size_ul(len); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 742 | if (!cs) { |
Pau Espin Pedrol | 2338e53 | 2020-05-12 20:54:35 +0200 | [diff] [blame] | 743 | bts()->do_rate_ctr_inc(CTR_DECODE_ERRORS); |
Pau Espin Pedrol | 259532f | 2020-06-30 17:44:11 +0200 | [diff] [blame] | 744 | LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid " |
| 745 | "length %d: %s\n", len, osmo_hexdump(data, len)); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 746 | return -EINVAL; |
| 747 | } |
| 748 | |
Pau Espin Pedrol | a107f8f | 2020-05-12 22:32:24 +0200 | [diff] [blame] | 749 | bts()->do_rate_ctr_add(CTR_RLC_UL_BYTES, len); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 750 | |
| 751 | LOGP(DRLCMACUL, LOGL_DEBUG, "Got RLC block, coding scheme: %s, " |
Pau Espin Pedrol | 2ae8337 | 2020-05-18 11:35:35 +0200 | [diff] [blame] | 752 | "length: %d (%d))\n", mcs_name(cs), len, mcs_used_size_ul(cs)); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 753 | |
Max | 8a8e0fb | 2019-03-25 16:32:50 +0100 | [diff] [blame] | 754 | if (mcs_is_gprs(cs)) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 755 | return rcv_block_gprs(data, len, fn, meas, cs); |
| 756 | |
Max | 8a8e0fb | 2019-03-25 16:32:50 +0100 | [diff] [blame] | 757 | if (mcs_is_edge(cs)) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 758 | return rcv_data_block(data, len, fn, meas, cs); |
| 759 | |
Pau Espin Pedrol | 2338e53 | 2020-05-12 20:54:35 +0200 | [diff] [blame] | 760 | bts()->do_rate_ctr_inc(CTR_DECODE_ERRORS); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 761 | LOGP(DRLCMACUL, LOGL_ERROR, "Unsupported coding scheme %s\n", |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 762 | mcs_name(cs)); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 763 | return -EINVAL; |
| 764 | } |
| 765 | |
| 766 | /*! \brief process egprs and gprs data blocks */ |
| 767 | int gprs_rlcmac_pdch::rcv_data_block(uint8_t *data, uint8_t data_len, uint32_t fn, |
Pau Espin Pedrol | 2ae8337 | 2020-05-18 11:35:35 +0200 | [diff] [blame] | 768 | struct pcu_l1_meas *meas, enum CodingScheme cs) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 769 | { |
| 770 | int rc; |
| 771 | struct gprs_rlc_data_info rlc_dec; |
| 772 | struct gprs_rlcmac_ul_tbf *tbf; |
Pau Espin Pedrol | 2ae8337 | 2020-05-18 11:35:35 +0200 | [diff] [blame] | 773 | unsigned len = mcs_size_ul(cs); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 774 | |
| 775 | /* These are always data blocks, since EGPRS still uses CS-1 for |
| 776 | * control blocks (see 44.060, section 10.3, 1st par.) |
| 777 | */ |
Max | 8a8e0fb | 2019-03-25 16:32:50 +0100 | [diff] [blame] | 778 | if (mcs_is_edge(cs)) { |
Pau Espin Pedrol | 0b0391f | 2020-05-19 17:23:23 +0200 | [diff] [blame] | 779 | bts()->send_gsmtap_meas(PCU_GSMTAP_C_UL_DATA_EGPRS, true, |
| 780 | trx_no(), ts_no, GSMTAP_CHANNEL_PDTCH, fn, |
| 781 | data, data_len, meas); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 782 | if (!bts()->bts_data()->egprs_enabled) { |
| 783 | LOGP(DRLCMACUL, LOGL_ERROR, |
| 784 | "Got %s RLC block but EGPRS is not enabled\n", |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 785 | mcs_name(cs)); |
Pau Espin Pedrol | 20331ae | 2020-04-29 21:02:08 +0200 | [diff] [blame] | 786 | return 0; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 787 | } |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 788 | } else { |
Pau Espin Pedrol | 0b0391f | 2020-05-19 17:23:23 +0200 | [diff] [blame] | 789 | bts()->send_gsmtap_meas(PCU_GSMTAP_C_UL_DATA_GPRS, true, |
| 790 | trx_no(), ts_no, GSMTAP_CHANNEL_PDTCH, fn, |
| 791 | data, data_len, meas); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 792 | } |
| 793 | |
| 794 | LOGP(DRLCMACUL, LOGL_DEBUG, " UL data: %s\n", osmo_hexdump(data, len)); |
| 795 | |
| 796 | rc = Decoding::rlc_parse_ul_data_header(&rlc_dec, data, cs); |
| 797 | if (rc < 0) { |
| 798 | LOGP(DRLCMACUL, LOGL_ERROR, |
| 799 | "Got %s RLC block but header parsing has failed\n", |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 800 | mcs_name(cs)); |
Pau Espin Pedrol | 2338e53 | 2020-05-12 20:54:35 +0200 | [diff] [blame] | 801 | bts()->do_rate_ctr_inc(CTR_DECODE_ERRORS); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 802 | return rc; |
| 803 | } |
| 804 | |
| 805 | LOGP(DRLCMACUL, LOGL_INFO, |
| 806 | "Got %s RLC block: " |
| 807 | "R=%d, SI=%d, TFI=%d, CPS=%d, RSB=%d, " |
| 808 | "rc=%d\n", |
Max | 136ebcc | 2019-03-05 14:59:03 +0100 | [diff] [blame] | 809 | mcs_name(cs), |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 810 | rlc_dec.r, rlc_dec.si, rlc_dec.tfi, rlc_dec.cps, rlc_dec.rsb, |
| 811 | rc); |
| 812 | |
| 813 | /* find TBF inst from given TFI */ |
| 814 | tbf = ul_tbf_by_tfi(rlc_dec.tfi); |
| 815 | if (!tbf) { |
| 816 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TFI=%d\n", |
| 817 | rlc_dec.tfi); |
| 818 | return 0; |
| 819 | } |
| 820 | |
| 821 | /* Reset N3101 counter: */ |
Max | 847ed9f | 2018-02-20 18:16:11 +0100 | [diff] [blame] | 822 | tbf->n_reset(N3101); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 823 | |
| 824 | return tbf->rcv_data_block_acknowledged(&rlc_dec, data, meas); |
| 825 | } |
| 826 | |
| 827 | int gprs_rlcmac_pdch::rcv_block_gprs(uint8_t *data, uint8_t data_len, uint32_t fn, |
Pau Espin Pedrol | 2ae8337 | 2020-05-18 11:35:35 +0200 | [diff] [blame] | 828 | struct pcu_l1_meas *meas, enum CodingScheme cs) |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 829 | { |
| 830 | unsigned payload = data[0] >> 6; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 831 | int rc = 0; |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 832 | |
| 833 | switch (payload) { |
| 834 | case GPRS_RLCMAC_DATA_BLOCK: |
| 835 | rc = rcv_data_block(data, data_len, fn, meas, cs); |
| 836 | break; |
| 837 | case GPRS_RLCMAC_CONTROL_BLOCK: |
Pau Espin Pedrol | e13cdc5 | 2019-09-25 13:46:14 +0200 | [diff] [blame] | 838 | rc = rcv_control_block(data, data_len, fn, meas, cs); |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 839 | break; |
| 840 | case GPRS_RLCMAC_CONTROL_BLOCK_OPT: |
| 841 | LOGP(DRLCMAC, LOGL_NOTICE, "GPRS_RLCMAC_CONTROL_BLOCK_OPT block payload is not supported.\n"); |
| 842 | break; |
| 843 | default: |
| 844 | LOGP(DRLCMAC, LOGL_NOTICE, "Unknown RLCMAC block payload(%u).\n", payload); |
| 845 | rc = -EINVAL; |
| 846 | } |
| 847 | |
| 848 | return rc; |
| 849 | } |
| 850 | |
| 851 | gprs_rlcmac_tbf *gprs_rlcmac_pdch::tbf_from_list_by_tfi( |
| 852 | LListHead<gprs_rlcmac_tbf> *tbf_list, uint8_t tfi, |
| 853 | enum gprs_rlcmac_tbf_direction dir) |
| 854 | { |
| 855 | gprs_rlcmac_tbf *tbf; |
| 856 | LListHead<gprs_rlcmac_tbf> *pos; |
| 857 | |
| 858 | llist_for_each(pos, tbf_list) { |
| 859 | tbf = pos->entry(); |
| 860 | if (tbf->tfi() != tfi) |
| 861 | continue; |
| 862 | if (!tbf->pdch[ts_no]) |
| 863 | continue; |
| 864 | return tbf; |
| 865 | } |
| 866 | return NULL; |
| 867 | } |
| 868 | |
| 869 | gprs_rlcmac_ul_tbf *gprs_rlcmac_pdch::ul_tbf_by_tfi(uint8_t tfi) |
| 870 | { |
| 871 | return as_ul_tbf(tbf_by_tfi(tfi, GPRS_RLCMAC_UL_TBF)); |
| 872 | } |
| 873 | |
| 874 | gprs_rlcmac_dl_tbf *gprs_rlcmac_pdch::dl_tbf_by_tfi(uint8_t tfi) |
| 875 | { |
| 876 | return as_dl_tbf(tbf_by_tfi(tfi, GPRS_RLCMAC_DL_TBF)); |
| 877 | } |
| 878 | |
| 879 | /* lookup TBF Entity (by TFI) */ |
| 880 | gprs_rlcmac_tbf *gprs_rlcmac_pdch::tbf_by_tfi(uint8_t tfi, |
| 881 | enum gprs_rlcmac_tbf_direction dir) |
| 882 | { |
| 883 | struct gprs_rlcmac_tbf *tbf; |
| 884 | |
| 885 | if (tfi >= 32) |
| 886 | return NULL; |
| 887 | |
| 888 | tbf = m_tbfs[dir][tfi]; |
| 889 | |
| 890 | if (!tbf) |
| 891 | return NULL; |
| 892 | |
| 893 | if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)) { |
| 894 | return tbf; |
| 895 | } |
| 896 | |
| 897 | return NULL; |
| 898 | } |
| 899 | |
| 900 | void gprs_rlcmac_pdch::attach_tbf(gprs_rlcmac_tbf *tbf) |
| 901 | { |
| 902 | gprs_rlcmac_ul_tbf *ul_tbf; |
| 903 | |
| 904 | if (m_tbfs[tbf->direction][tbf->tfi()]) |
| 905 | LOGP(DRLCMAC, LOGL_ERROR, "PDCH(TS %d, TRX %d): " |
| 906 | "%s has not been detached, overwriting it\n", |
| 907 | ts_no, trx_no(), |
| 908 | m_tbfs[tbf->direction][tbf->tfi()]->name()); |
| 909 | |
| 910 | m_num_tbfs[tbf->direction] += 1; |
| 911 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| 912 | ul_tbf = as_ul_tbf(tbf); |
| 913 | m_assigned_usf |= 1 << ul_tbf->m_usf[ts_no]; |
| 914 | } |
| 915 | m_assigned_tfi[tbf->direction] |= 1UL << tbf->tfi(); |
| 916 | m_tbfs[tbf->direction][tbf->tfi()] = tbf; |
| 917 | |
| 918 | LOGP(DRLCMAC, LOGL_INFO, "PDCH(TS %d, TRX %d): Attaching %s, %d TBFs, " |
| 919 | "USFs = %02x, TFIs = %08x.\n", |
| 920 | ts_no, trx_no(), tbf->name(), m_num_tbfs[tbf->direction], |
| 921 | m_assigned_usf, m_assigned_tfi[tbf->direction]); |
| 922 | } |
| 923 | |
| 924 | void gprs_rlcmac_pdch::detach_tbf(gprs_rlcmac_tbf *tbf) |
| 925 | { |
| 926 | gprs_rlcmac_ul_tbf *ul_tbf; |
| 927 | |
| 928 | OSMO_ASSERT(m_num_tbfs[tbf->direction] > 0); |
| 929 | |
| 930 | m_num_tbfs[tbf->direction] -= 1; |
| 931 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| 932 | ul_tbf = as_ul_tbf(tbf); |
| 933 | m_assigned_usf &= ~(1 << ul_tbf->m_usf[ts_no]); |
| 934 | } |
| 935 | m_assigned_tfi[tbf->direction] &= ~(1UL << tbf->tfi()); |
| 936 | m_tbfs[tbf->direction][tbf->tfi()] = NULL; |
| 937 | |
| 938 | LOGP(DRLCMAC, LOGL_INFO, "PDCH(TS %d, TRX %d): Detaching %s, %d TBFs, " |
| 939 | "USFs = %02x, TFIs = %08x.\n", |
| 940 | ts_no, trx_no(), tbf->name(), m_num_tbfs[tbf->direction], |
| 941 | m_assigned_usf, m_assigned_tfi[tbf->direction]); |
| 942 | } |
| 943 | |
| 944 | void gprs_rlcmac_pdch::reserve(enum gprs_rlcmac_tbf_direction dir) |
| 945 | { |
| 946 | m_num_reserved[dir] += 1; |
| 947 | } |
| 948 | |
| 949 | void gprs_rlcmac_pdch::unreserve(enum gprs_rlcmac_tbf_direction dir) |
| 950 | { |
| 951 | OSMO_ASSERT(m_num_reserved[dir] > 0); |
| 952 | m_num_reserved[dir] -= 1; |
| 953 | } |
| 954 | |
| 955 | inline BTS *gprs_rlcmac_pdch::bts() const |
| 956 | { |
| 957 | return trx->bts; |
| 958 | } |
| 959 | |
| 960 | uint8_t gprs_rlcmac_pdch::trx_no() const |
| 961 | { |
| 962 | return trx->trx_no; |
| 963 | } |
| 964 | |
| 965 | inline gprs_rlcmac_bts *gprs_rlcmac_pdch::bts_data() const |
| 966 | { |
| 967 | return trx->bts->bts_data(); |
| 968 | } |
Vadim Yanitskiy | bd0dac3 | 2019-10-05 21:57:14 +0700 | [diff] [blame] | 969 | |
| 970 | /* PTCCH (Packet Timing Advance Control Channel) */ |
| 971 | void gprs_rlcmac_pdch::init_ptcch_msg(void) |
| 972 | { |
| 973 | memset(ptcch_msg, PTCCH_TAI_FREE, PTCCH_TAI_NUM); |
| 974 | memset(ptcch_msg + PTCCH_TAI_NUM, PTCCH_PADDING, 7); |
| 975 | } |
| 976 | |
| 977 | uint8_t gprs_rlcmac_pdch::reserve_tai(uint8_t ta) |
| 978 | { |
| 979 | uint8_t tai; |
| 980 | |
| 981 | for (tai = 0; tai < PTCCH_TAI_NUM; tai++) { |
| 982 | if (ptcch_msg[tai] == PTCCH_TAI_FREE) { |
| 983 | ptcch_msg[tai] = ta; |
| 984 | return tai; |
| 985 | } |
| 986 | } |
| 987 | |
| 988 | /* Special case: no free TAI available */ |
| 989 | return PTCCH_TAI_FREE; |
| 990 | } |
| 991 | |
| 992 | void gprs_rlcmac_pdch::release_tai(uint8_t tai) |
| 993 | { |
| 994 | OSMO_ASSERT(tai < PTCCH_TAI_NUM); |
| 995 | ptcch_msg[tai] = PTCCH_TAI_FREE; |
| 996 | } |
| 997 | |
| 998 | void gprs_rlcmac_pdch::update_ta(uint8_t tai, uint8_t ta) |
| 999 | { |
| 1000 | OSMO_ASSERT(tai < PTCCH_TAI_NUM); |
| 1001 | ptcch_msg[tai] = ta; |
| 1002 | } |