Holger Hans Peter Freyther | b6acfda | 2013-10-17 19:41:11 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 by Holger Hans Peter Freyther |
| 3 | * |
| 4 | * All Rights Reserved |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU Affero General Public License as published by |
| 8 | * the Free Software Foundation; either version 3 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Affero General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <bts.h> |
Holger Hans Peter Freyther | b78adcd | 2013-10-17 20:12:37 +0200 | [diff] [blame] | 22 | #include <poll_controller.h> |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 23 | #include <tbf.h> |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 24 | #include <encoding.h> |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 25 | #include <decoding.h> |
| 26 | #include <rlc.h> |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 27 | |
| 28 | #include <gprs_rlcmac.h> |
Holger Hans Peter Freyther | 24e98d0 | 2013-10-19 18:15:44 +0200 | [diff] [blame] | 29 | #include <gprs_debug.h> |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 30 | |
| 31 | extern "C" { |
| 32 | #include <osmocom/core/talloc.h> |
Holger Hans Peter Freyther | 24e98d0 | 2013-10-19 18:15:44 +0200 | [diff] [blame] | 33 | #include <osmocom/core/msgb.h> |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 34 | } |
Holger Hans Peter Freyther | b78adcd | 2013-10-17 20:12:37 +0200 | [diff] [blame] | 35 | |
Holger Hans Peter Freyther | 24e98d0 | 2013-10-19 18:15:44 +0200 | [diff] [blame] | 36 | #include <arpa/inet.h> |
| 37 | |
Holger Hans Peter Freyther | f098489 | 2013-10-19 18:28:59 +0200 | [diff] [blame] | 38 | #include <errno.h> |
Holger Hans Peter Freyther | b6acfda | 2013-10-17 19:41:11 +0200 | [diff] [blame] | 39 | #include <string.h> |
| 40 | |
Holger Hans Peter Freyther | 24e98d0 | 2013-10-19 18:15:44 +0200 | [diff] [blame] | 41 | extern void *tall_pcu_ctx; |
| 42 | |
Holger Hans Peter Freyther | b6acfda | 2013-10-17 19:41:11 +0200 | [diff] [blame] | 43 | static BTS s_bts; |
| 44 | |
| 45 | BTS* BTS::main_bts() |
| 46 | { |
| 47 | return &s_bts; |
| 48 | } |
| 49 | |
| 50 | struct gprs_rlcmac_bts *BTS::bts_data() |
| 51 | { |
| 52 | return &m_bts; |
| 53 | } |
| 54 | |
| 55 | struct gprs_rlcmac_bts *bts_main_data() |
| 56 | { |
| 57 | return BTS::main_bts()->bts_data(); |
| 58 | } |
| 59 | |
| 60 | BTS::BTS() |
Holger Hans Peter Freyther | 9b30c7f | 2013-10-17 19:59:56 +0200 | [diff] [blame] | 61 | : m_cur_fn(0) |
Holger Hans Peter Freyther | b78adcd | 2013-10-17 20:12:37 +0200 | [diff] [blame] | 62 | , m_pollController(*this) |
Holger Hans Peter Freyther | cedf890 | 2013-10-19 20:47:12 +0200 | [diff] [blame] | 63 | , m_sba(*this) |
Holger Hans Peter Freyther | b6acfda | 2013-10-17 19:41:11 +0200 | [diff] [blame] | 64 | { |
| 65 | memset(&m_bts, 0, sizeof(m_bts)); |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 66 | INIT_LLIST_HEAD(&m_bts.ul_tbfs); |
| 67 | INIT_LLIST_HEAD(&m_bts.dl_tbfs); |
Holger Hans Peter Freyther | b6acfda | 2013-10-17 19:41:11 +0200 | [diff] [blame] | 68 | m_bts.bts = this; |
Holger Hans Peter Freyther | 4ed1dae | 2013-10-20 10:14:03 +0200 | [diff] [blame] | 69 | |
| 70 | /* initialize back pointers */ |
| 71 | for (size_t trx_no = 0; trx_no < ARRAY_SIZE(m_bts.trx); ++trx_no) { |
| 72 | struct gprs_rlcmac_trx *trx = &m_bts.trx[trx_no]; |
| 73 | trx->trx_no = trx_no; |
| 74 | trx->bts = this; |
| 75 | |
| 76 | for (size_t ts_no = 0; ts_no < ARRAY_SIZE(trx->pdch); ++ts_no) { |
| 77 | struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts_no]; |
| 78 | pdch->ts_no = ts_no; |
| 79 | pdch->trx = trx; |
| 80 | } |
| 81 | } |
Holger Hans Peter Freyther | b6acfda | 2013-10-17 19:41:11 +0200 | [diff] [blame] | 82 | } |
Holger Hans Peter Freyther | 9b30c7f | 2013-10-17 19:59:56 +0200 | [diff] [blame] | 83 | |
| 84 | void BTS::set_current_frame_number(int fn) |
| 85 | { |
| 86 | m_cur_fn = fn; |
Holger Hans Peter Freyther | b78adcd | 2013-10-17 20:12:37 +0200 | [diff] [blame] | 87 | m_pollController.expireTimedout(m_cur_fn); |
Holger Hans Peter Freyther | 9b30c7f | 2013-10-17 19:59:56 +0200 | [diff] [blame] | 88 | } |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 89 | |
Holger Hans Peter Freyther | f098489 | 2013-10-19 18:28:59 +0200 | [diff] [blame] | 90 | int BTS::add_paging(uint8_t chan_needed, uint8_t *identity_lv) |
| 91 | { |
| 92 | uint8_t l, trx, ts, any_tbf = 0; |
| 93 | struct gprs_rlcmac_tbf *tbf; |
| 94 | struct gprs_rlcmac_paging *pag; |
| 95 | uint8_t slot_mask[8]; |
| 96 | int8_t first_ts; /* must be signed */ |
| 97 | |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 98 | llist_head *tbfs_lists[] = { |
| 99 | &m_bts.ul_tbfs, |
| 100 | &m_bts.dl_tbfs, |
| 101 | NULL |
| 102 | }; |
| 103 | |
| 104 | |
Holger Hans Peter Freyther | f098489 | 2013-10-19 18:28:59 +0200 | [diff] [blame] | 105 | LOGP(DRLCMAC, LOGL_INFO, "Add RR paging: chan-needed=%d MI=%s\n", |
| 106 | chan_needed, osmo_hexdump(identity_lv + 1, identity_lv[0])); |
| 107 | |
| 108 | /* collect slots to page |
| 109 | * Mark slots for every TBF, but only mark one of it. |
| 110 | * Mark only the first slot found. |
| 111 | * Don't mark, if TBF uses a different slot that is already marked. */ |
| 112 | memset(slot_mask, 0, sizeof(slot_mask)); |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 113 | for (l = 0; tbfs_lists[l]; l++) { |
| 114 | llist_for_each_entry(tbf, tbfs_lists[l], list) { |
Holger Hans Peter Freyther | f098489 | 2013-10-19 18:28:59 +0200 | [diff] [blame] | 115 | first_ts = -1; |
| 116 | for (ts = 0; ts < 8; ts++) { |
| 117 | if (tbf->pdch[ts]) { |
| 118 | /* remember the first slot found */ |
| 119 | if (first_ts < 0) |
| 120 | first_ts = ts; |
| 121 | /* break, if we already marked a slot */ |
| 122 | if ((slot_mask[tbf->trx_no] & (1 << ts))) |
| 123 | break; |
| 124 | } |
| 125 | } |
| 126 | /* mark first slot found, if none is marked already */ |
| 127 | if (ts == 8 && first_ts >= 0) { |
| 128 | LOGP(DRLCMAC, LOGL_DEBUG, "- %s TBF=%d uses " |
| 129 | "TRX=%d TS=%d, so we mark\n", |
| 130 | (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 131 | ? "UL" : "DL", |
| 132 | tbf->tfi, tbf->trx_no, first_ts); |
| 133 | slot_mask[tbf->trx_no] |= (1 << first_ts); |
| 134 | } else |
| 135 | LOGP(DRLCMAC, LOGL_DEBUG, "- %s TBF=%d uses " |
| 136 | "already marked TRX=%d TS=%d\n", |
| 137 | (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 138 | ? "UL" : "DL", |
| 139 | tbf->tfi, tbf->trx_no, ts); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | /* Now we have a list of marked slots. Every TBF uses at least one |
| 144 | * of these slots. */ |
| 145 | |
| 146 | /* schedule paging to all marked slots */ |
| 147 | for (trx = 0; trx < 8; trx++) { |
| 148 | if (slot_mask[trx] == 0) |
| 149 | continue; |
Holger Hans Peter Freyther | f098489 | 2013-10-19 18:28:59 +0200 | [diff] [blame] | 150 | for (ts = 0; ts < 8; ts++) { |
| 151 | if ((slot_mask[trx] & (1 << ts))) { |
| 152 | /* schedule */ |
| 153 | pag = talloc_zero(tall_pcu_ctx, |
| 154 | struct gprs_rlcmac_paging); |
| 155 | if (!pag) |
| 156 | return -ENOMEM; |
| 157 | pag->chan_needed = chan_needed; |
| 158 | memcpy(pag->identity_lv, identity_lv, |
| 159 | identity_lv[0] + 1); |
| 160 | m_bts.trx[trx].pdch[ts].add_paging(pag); |
| 161 | LOGP(DRLCMAC, LOGL_INFO, "Paging on PACCH of " |
| 162 | "TRX=%d TS=%d\n", trx, ts); |
Holger Hans Peter Freyther | 9446485 | 2013-10-19 18:33:52 +0200 | [diff] [blame] | 163 | any_tbf = 1; |
Holger Hans Peter Freyther | f098489 | 2013-10-19 18:28:59 +0200 | [diff] [blame] | 164 | } |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | if (!any_tbf) |
| 169 | LOGP(DRLCMAC, LOGL_INFO, "No paging, because no TBF\n"); |
| 170 | |
| 171 | return 0; |
| 172 | } |
| 173 | |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 174 | /* search for active downlink or uplink tbf */ |
| 175 | gprs_rlcmac_tbf *BTS::tbf_by_tlli(uint32_t tlli, enum gprs_rlcmac_tbf_direction dir) |
| 176 | { |
| 177 | struct gprs_rlcmac_tbf *tbf; |
| 178 | if (dir == GPRS_RLCMAC_UL_TBF) { |
| 179 | llist_for_each_entry(tbf, &m_bts.ul_tbfs, list) { |
| 180 | if (tbf->state_is_not(GPRS_RLCMAC_RELEASING) |
| 181 | && tbf->tlli == tlli && tbf->tlli_valid) |
| 182 | return tbf; |
| 183 | } |
| 184 | } else { |
| 185 | llist_for_each_entry(tbf, &m_bts.dl_tbfs, list) { |
| 186 | if (tbf->state_is_not(GPRS_RLCMAC_RELEASING) |
| 187 | && tbf->tlli == tlli) |
| 188 | return tbf; |
| 189 | } |
| 190 | } |
| 191 | return NULL; |
| 192 | } |
| 193 | |
| 194 | gprs_rlcmac_tbf *BTS::tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts) |
| 195 | { |
| 196 | struct gprs_rlcmac_tbf *tbf; |
| 197 | |
| 198 | /* only one TBF can poll on specific TS/FN, because scheduler can only |
| 199 | * schedule one downlink control block (with polling) at a FN per TS */ |
| 200 | llist_for_each_entry(tbf, &m_bts.ul_tbfs, list) { |
| 201 | if (tbf->state_is_not(GPRS_RLCMAC_RELEASING) |
| 202 | && tbf->poll_state == GPRS_RLCMAC_POLL_SCHED |
| 203 | && tbf->poll_fn == fn && tbf->trx_no == trx |
| 204 | && tbf->control_ts == ts) |
| 205 | return tbf; |
| 206 | } |
| 207 | llist_for_each_entry(tbf, &m_bts.dl_tbfs, list) { |
| 208 | if (tbf->state_is_not(GPRS_RLCMAC_RELEASING) |
| 209 | && tbf->poll_state == GPRS_RLCMAC_POLL_SCHED |
| 210 | && tbf->poll_fn == fn && tbf->trx_no == trx |
| 211 | && tbf->control_ts == ts) |
| 212 | return tbf; |
| 213 | } |
| 214 | return NULL; |
| 215 | } |
| 216 | |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 217 | |
| 218 | /* |
| 219 | * PDCH code below. TODO: move to a separate file |
| 220 | */ |
| 221 | |
| 222 | /* After receiving these frames, we send ack/nack. */ |
| 223 | #define SEND_ACK_AFTER_FRAMES 20 |
| 224 | |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 225 | void gprs_rlcmac_pdch::enable() |
| 226 | { |
| 227 | /* TODO: Check if there are still allocated resources.. */ |
| 228 | INIT_LLIST_HEAD(&paging_list); |
| 229 | m_is_enabled = 1; |
| 230 | } |
| 231 | |
| 232 | void gprs_rlcmac_pdch::disable() |
| 233 | { |
| 234 | /* TODO.. kick free_resources once we know the TRX/TS we are on */ |
| 235 | m_is_enabled = 0; |
| 236 | } |
| 237 | |
Holger Hans Peter Freyther | cedf890 | 2013-10-19 20:47:12 +0200 | [diff] [blame] | 238 | /* TODO: kill the parameter and make a pdch belong to a trx.. to a bts.. */ |
Holger Hans Peter Freyther | 09ef27a | 2013-10-20 16:37:05 +0200 | [diff] [blame] | 239 | void gprs_rlcmac_pdch::free_resources() |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 240 | { |
| 241 | struct gprs_rlcmac_paging *pag; |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 242 | |
| 243 | /* we are not enabled. there should be no resources */ |
| 244 | if (!is_enabled()) |
| 245 | return; |
| 246 | |
| 247 | /* kick all TBF on slot */ |
| 248 | gprs_rlcmac_tbf::free_all(this); |
| 249 | |
| 250 | /* flush all pending paging messages */ |
Holger Hans Peter Freyther | 24e98d0 | 2013-10-19 18:15:44 +0200 | [diff] [blame] | 251 | while ((pag = dequeue_paging())) |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 252 | talloc_free(pag); |
| 253 | |
Holger Hans Peter Freyther | 09ef27a | 2013-10-20 16:37:05 +0200 | [diff] [blame] | 254 | trx->bts->sba()->free_resources(this); |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 255 | } |
Holger Hans Peter Freyther | 24e98d0 | 2013-10-19 18:15:44 +0200 | [diff] [blame] | 256 | |
| 257 | struct gprs_rlcmac_paging *gprs_rlcmac_pdch::dequeue_paging() |
| 258 | { |
| 259 | struct gprs_rlcmac_paging *pag; |
| 260 | |
| 261 | if (llist_empty(&paging_list)) |
| 262 | return NULL; |
| 263 | pag = llist_entry(paging_list.next, struct gprs_rlcmac_paging, list); |
| 264 | llist_del(&pag->list); |
| 265 | |
| 266 | return pag; |
| 267 | } |
| 268 | |
| 269 | struct msgb *gprs_rlcmac_pdch::packet_paging_request() |
| 270 | { |
| 271 | struct gprs_rlcmac_paging *pag; |
| 272 | struct msgb *msg; |
| 273 | unsigned wp = 0, len; |
| 274 | |
| 275 | /* no paging, no message */ |
| 276 | pag = dequeue_paging(); |
| 277 | if (!pag) |
| 278 | return NULL; |
| 279 | |
| 280 | LOGP(DRLCMAC, LOGL_DEBUG, "Scheduling paging\n"); |
| 281 | |
| 282 | /* alloc message */ |
| 283 | msg = msgb_alloc(23, "pag ctrl block"); |
| 284 | if (!msg) { |
| 285 | talloc_free(pag); |
| 286 | return NULL; |
| 287 | } |
| 288 | bitvec *pag_vec = bitvec_alloc(23); |
| 289 | if (!pag_vec) { |
| 290 | msgb_free(msg); |
| 291 | talloc_free(pag); |
| 292 | return NULL; |
| 293 | } |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 294 | wp = Encoding::write_packet_paging_request(pag_vec); |
Holger Hans Peter Freyther | 24e98d0 | 2013-10-19 18:15:44 +0200 | [diff] [blame] | 295 | |
| 296 | /* loop until message is full */ |
| 297 | while (pag) { |
| 298 | /* try to add paging */ |
| 299 | if ((pag->identity_lv[1] & 0x07) == 4) { |
| 300 | /* TMSI */ |
| 301 | LOGP(DRLCMAC, LOGL_DEBUG, "- TMSI=0x%08x\n", |
| 302 | ntohl(*((uint32_t *)(pag->identity_lv + 1)))); |
| 303 | len = 1 + 1 + 1 + 32 + 2 + 1; |
| 304 | if (pag->identity_lv[0] != 5) { |
| 305 | LOGP(DRLCMAC, LOGL_ERROR, "TMSI paging with " |
| 306 | "MI != 5 octets!\n"); |
| 307 | goto continue_next; |
| 308 | } |
| 309 | } else { |
| 310 | /* MI */ |
| 311 | LOGP(DRLCMAC, LOGL_DEBUG, "- MI=%s\n", |
| 312 | osmo_hexdump(pag->identity_lv + 1, |
| 313 | pag->identity_lv[0])); |
| 314 | len = 1 + 1 + 1 + 4 + (pag->identity_lv[0]<<3) + 2 + 1; |
| 315 | if (pag->identity_lv[0] > 8) { |
| 316 | LOGP(DRLCMAC, LOGL_ERROR, "Paging with " |
| 317 | "MI > 8 octets!\n"); |
| 318 | goto continue_next; |
| 319 | } |
| 320 | } |
| 321 | if (wp + len > 184) { |
| 322 | LOGP(DRLCMAC, LOGL_DEBUG, "- Does not fit, so schedule " |
| 323 | "next time\n"); |
| 324 | /* put back paging record, because does not fit */ |
| 325 | llist_add_tail(&pag->list, &paging_list); |
| 326 | break; |
| 327 | } |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 328 | Encoding::write_repeated_page_info(pag_vec, wp, pag->identity_lv[0], |
Holger Hans Peter Freyther | 24e98d0 | 2013-10-19 18:15:44 +0200 | [diff] [blame] | 329 | pag->identity_lv + 1, pag->chan_needed); |
| 330 | |
| 331 | continue_next: |
| 332 | talloc_free(pag); |
| 333 | pag = dequeue_paging(); |
| 334 | } |
| 335 | |
| 336 | bitvec_pack(pag_vec, msgb_put(msg, 23)); |
| 337 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
| 338 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Paging Request +++++++++++++++++++++++++\n"); |
| 339 | decode_gsm_rlcmac_downlink(pag_vec, mac_control_block); |
| 340 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 341 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Paging Request -------------------------\n"); |
| 342 | bitvec_free(pag_vec); |
| 343 | talloc_free(mac_control_block); |
| 344 | |
| 345 | return msg; |
| 346 | } |
| 347 | |
Holger Hans Peter Freyther | f098489 | 2013-10-19 18:28:59 +0200 | [diff] [blame] | 348 | void gprs_rlcmac_pdch::add_paging(struct gprs_rlcmac_paging *pag) |
| 349 | { |
| 350 | llist_add(&pag->list, &paging_list); |
| 351 | } |
Holger Hans Peter Freyther | 9ae367f | 2013-10-26 16:42:38 +0200 | [diff] [blame] | 352 | |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 353 | /* receive UL data block |
| 354 | * |
| 355 | * The blocks are defragmented and forwarded as LLC frames, if complete. |
| 356 | */ |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 357 | int gprs_rlcmac_pdch::rcv_data_block_acknowledged(uint8_t *data, uint8_t len, int8_t rssi) |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 358 | { |
| 359 | struct gprs_rlcmac_tbf *tbf; |
| 360 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
| 361 | uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index; |
| 362 | int rc; |
| 363 | |
| 364 | switch (len) { |
| 365 | case 54: |
| 366 | /* omitting spare bits */ |
| 367 | len = 53; |
| 368 | break; |
| 369 | case 40: |
| 370 | /* omitting spare bits */ |
| 371 | len = 39; |
| 372 | break; |
| 373 | case 34: |
| 374 | /* omitting spare bits */ |
| 375 | len = 33; |
| 376 | break; |
| 377 | case 23: |
| 378 | break; |
| 379 | default: |
| 380 | LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid" |
| 381 | "length: %d)\n", len); |
| 382 | return -EINVAL; |
| 383 | } |
| 384 | |
| 385 | /* find TBF inst from given TFI */ |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 386 | tbf = tbf_by_tfi(bts_data(), rh->tfi, trx_no(), GPRS_RLCMAC_UL_TBF); |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 387 | if (!tbf) { |
| 388 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TBF=%d\n", |
| 389 | rh->tfi); |
| 390 | return 0; |
| 391 | } |
| 392 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_UL_DATA); |
| 393 | |
| 394 | LOGP(DRLCMACUL, LOGL_DEBUG, "UL DATA TBF=%d received (V(Q)=%d .. " |
| 395 | "V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r); |
| 396 | |
| 397 | /* process RSSI */ |
| 398 | gprs_rlcmac_rssi(tbf, rssi); |
| 399 | |
| 400 | /* get TLLI */ |
| 401 | if (!tbf->tlli_valid) { |
| 402 | struct gprs_rlcmac_tbf *dl_tbf, *ul_tbf; |
| 403 | |
| 404 | /* no TLLI yet */ |
| 405 | if (!rh->ti) { |
| 406 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d without " |
| 407 | "TLLI, but no TLLI received yet\n", rh->tfi); |
| 408 | return 0; |
| 409 | } |
| 410 | rc = Decoding::tlli_from_ul_data(data, len, &tbf->tlli); |
| 411 | if (rc) { |
| 412 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
| 413 | "of UL DATA TBF=%d.\n", rh->tfi); |
| 414 | return 0; |
| 415 | } |
| 416 | LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of " |
| 417 | "UL DATA TBF=%d.\n", tbf->tlli, rh->tfi); |
Holger Hans Peter Freyther | 65be480 | 2013-10-26 18:39:36 +0200 | [diff] [blame] | 418 | if ((dl_tbf = bts()->tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF))) { |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 419 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 420 | "TLLI=0x%08x while DL TBF=%d still exists. " |
| 421 | "Killing pending DL TBF\n", tbf->tlli, |
| 422 | dl_tbf->tfi); |
| 423 | tbf_free(dl_tbf); |
| 424 | } |
| 425 | /* tbf_by_tlli will not find your TLLI, because it is not |
| 426 | * yet marked valid */ |
Holger Hans Peter Freyther | 65be480 | 2013-10-26 18:39:36 +0200 | [diff] [blame] | 427 | if ((ul_tbf = bts()->tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF))) { |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 428 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 429 | "TLLI=0x%08x while UL TBF=%d still exists. " |
| 430 | "Killing pending UL TBF\n", tbf->tlli, |
| 431 | ul_tbf->tfi); |
| 432 | tbf_free(ul_tbf); |
| 433 | } |
| 434 | /* mark TLLI valid now */ |
| 435 | tbf->tlli_valid = 1; |
| 436 | /* store current timing advance */ |
Holger Hans Peter Freyther | 65be480 | 2013-10-26 18:39:36 +0200 | [diff] [blame] | 437 | bts()->timing_advance()->remember(tbf->tlli, tbf->ta); |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 438 | /* already have TLLI, but we stille get another one */ |
| 439 | } else if (rh->ti) { |
| 440 | uint32_t tlli; |
| 441 | rc = Decoding::tlli_from_ul_data(data, len, &tlli); |
| 442 | if (rc) { |
| 443 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
| 444 | "of UL DATA TBF=%d.\n", rh->tfi); |
| 445 | return 0; |
| 446 | } |
| 447 | if (tlli != tbf->tlli) { |
| 448 | LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL " |
| 449 | "DATA TBF=%d. (Ignoring due to contention " |
| 450 | "resolution)\n", rh->tfi); |
| 451 | return 0; |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | mod_sns = tbf->sns - 1; |
| 456 | mod_sns_half = (tbf->sns >> 1) - 1; |
| 457 | |
| 458 | /* restart T3169 */ |
Holger Hans Peter Freyther | 65be480 | 2013-10-26 18:39:36 +0200 | [diff] [blame] | 459 | tbf_timer_start(tbf, 3169, bts_data()->t3169, 0); |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 460 | |
| 461 | /* Increment RX-counter */ |
| 462 | tbf->dir.ul.rx_counter++; |
| 463 | |
| 464 | /* current block relative to lowest unreceived block */ |
| 465 | offset_v_q = (rh->bsn - tbf->dir.ul.v_q) & mod_sns; |
| 466 | /* If out of window (may happen if blocks below V(Q) are received |
| 467 | * again. */ |
| 468 | if (offset_v_q >= tbf->ws) { |
| 469 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window " |
| 470 | "%d..%d (it's normal)\n", rh->bsn, tbf->dir.ul.v_q, |
| 471 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 472 | return 0; |
| 473 | } |
| 474 | /* Write block to buffer and set receive state array. */ |
| 475 | index = rh->bsn & mod_sns_half; /* memory index of block */ |
| 476 | memcpy(tbf->rlc_block[index], data, len); /* Copy block. */ |
| 477 | tbf->rlc_block_len[index] = len; |
| 478 | tbf->dir.ul.v_n[index] = 'R'; /* Mark received block. */ |
| 479 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n", |
| 480 | rh->bsn, tbf->dir.ul.v_q, |
| 481 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 482 | /* Raise V(R) to highest received sequence number not received. */ |
| 483 | offset_v_r = (rh->bsn + 1 - tbf->dir.ul.v_r) & mod_sns; |
| 484 | if (offset_v_r < (tbf->sns >> 1)) { /* Positive offset, so raise. */ |
| 485 | while (offset_v_r--) { |
| 486 | if (offset_v_r) /* all except the received block */ |
| 487 | tbf->dir.ul.v_n[tbf->dir.ul.v_r & mod_sns_half] |
| 488 | = 'N'; /* Mark block as not received */ |
| 489 | tbf->dir.ul.v_r = (tbf->dir.ul.v_r + 1) & mod_sns; |
| 490 | /* Inc V(R). */ |
| 491 | } |
| 492 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", |
| 493 | tbf->dir.ul.v_r); |
| 494 | } |
| 495 | |
Holger Hans Peter Freyther | a54bbbb | 2013-10-26 19:05:42 +0200 | [diff] [blame^] | 496 | #warning "Move to TBF and remove the index side effect.." |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 497 | /* Raise V(Q) if possible, and retrieve LLC frames from blocks. |
| 498 | * This is looped until there is a gap (non received block) or |
| 499 | * the window is empty.*/ |
| 500 | while (tbf->dir.ul.v_q != tbf->dir.ul.v_r && tbf->dir.ul.v_n[ |
| 501 | (index = tbf->dir.ul.v_q & mod_sns_half)] == 'R') { |
| 502 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising " |
| 503 | "V(Q) to %d\n", tbf->dir.ul.v_q, |
| 504 | (tbf->dir.ul.v_q + 1) & mod_sns); |
| 505 | /* get LLC data from block */ |
| 506 | tbf->assemble_forward_llc(tbf->rlc_block[index], tbf->rlc_block_len[index]); |
| 507 | /* raise V(Q), because block already received */ |
| 508 | tbf->dir.ul.v_q = (tbf->dir.ul.v_q + 1) & mod_sns; |
| 509 | } |
| 510 | |
| 511 | /* Check CV of last frame in buffer */ |
| 512 | if (tbf->state_is(GPRS_RLCMAC_FLOW) /* still in flow state */ |
| 513 | && tbf->dir.ul.v_q == tbf->dir.ul.v_r) { /* if complete */ |
| 514 | struct rlc_ul_header *last_rh = (struct rlc_ul_header *) |
| 515 | tbf->rlc_block[(tbf->dir.ul.v_r - 1) & mod_sns_half]; |
| 516 | LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, " |
| 517 | "last block: BSN=%d CV=%d\n", last_rh->bsn, |
| 518 | last_rh->cv); |
| 519 | if (last_rh->cv == 0) { |
| 520 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL " |
| 521 | "TBF\n"); |
| 522 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 523 | /* Reset N3103 counter. */ |
| 524 | tbf->dir.ul.n3103 = 0; |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | /* If TLLI is included or if we received half of the window, we send |
| 529 | * an ack/nack */ |
| 530 | if (rh->si || rh->ti || tbf->state_is(GPRS_RLCMAC_FINISHED) |
| 531 | || (tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
| 532 | if (rh->si) { |
| 533 | LOGP(DRLCMACUL, LOGL_NOTICE, "- Scheduling Ack/Nack, " |
| 534 | "because MS is stalled.\n"); |
| 535 | } |
| 536 | if (rh->ti) { |
| 537 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
| 538 | "because TLLI is included.\n"); |
| 539 | } |
| 540 | if (tbf->state_is(GPRS_RLCMAC_FINISHED)) { |
| 541 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
| 542 | "because last block has CV==0.\n"); |
| 543 | } |
| 544 | if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
| 545 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
| 546 | "because %d frames received.\n", |
| 547 | SEND_ACK_AFTER_FRAMES); |
| 548 | } |
| 549 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) { |
| 550 | #ifdef DEBUG_DIAGRAM |
| 551 | if (rh->si) |
| 552 | debug_diagram(bts->bts, tbf->diag, "sched UL-ACK stall"); |
| 553 | if (rh->ti) |
| 554 | debug_diagram(bts->bts, tbf->diag, "sched UL-ACK TLLI"); |
| 555 | if (tbf->state_is(GPRS_RLCMAC_FINISHED)) |
| 556 | debug_diagram(bts->bts, tbf->diag, "sched UL-ACK CV==0"); |
| 557 | if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) |
| 558 | debug_diagram(bts->bts, tbf->diag, "sched UL-ACK n=%d", |
| 559 | tbf->dir.ul.rx_counter); |
| 560 | #endif |
| 561 | /* trigger sending at next RTS */ |
| 562 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 563 | } else { |
| 564 | /* already triggered */ |
| 565 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Sending Ack/Nack is " |
| 566 | "already triggered, don't schedule!\n"); |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | return 0; |
| 571 | } |
| 572 | |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 573 | /* Received Uplink RLC control block. */ |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 574 | int gprs_rlcmac_pdch::rcv_control_block( |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 575 | bitvec *rlc_block, uint32_t fn) |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 576 | { |
| 577 | int8_t tfi = 0; /* must be signed */ |
| 578 | uint32_t tlli = 0; |
| 579 | struct gprs_rlcmac_tbf *tbf; |
| 580 | struct gprs_rlcmac_sba *sba; |
| 581 | int rc; |
| 582 | |
| 583 | RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t); |
| 584 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n"); |
| 585 | decode_gsm_rlcmac_uplink(rlc_block, ul_control_block); |
| 586 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 587 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n"); |
| 588 | switch (ul_control_block->u.MESSAGE_TYPE) { |
| 589 | case MT_PACKET_CONTROL_ACK: |
| 590 | tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI; |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 591 | tbf = bts()->tbf_by_poll_fn(fn, trx_no(), ts_no); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 592 | if (!tbf) { |
| 593 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " |
| 594 | "unknown FN=%u TLL=0x%08x (TRX %d TS %d)\n", |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 595 | fn, tlli, trx_no(), ts_no); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 596 | break; |
| 597 | } |
| 598 | tfi = tbf->tfi; |
| 599 | if (tlli != tbf->tlli) { |
| 600 | LOGP(DRLCMAC, LOGL_INFO, "Phone changed TLLI to " |
| 601 | "0x%08x\n", tlli); |
| 602 | tbf->tlli = tlli; |
| 603 | } |
| 604 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Control Ack\n", tbf->tfi, tbf->tlli); |
| 605 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 606 | |
| 607 | /* check if this control ack belongs to packet uplink ack */ |
| 608 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
| 609 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| 610 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 611 | debug_diagram(bts(), tbf->diag, "got CTL-ACK (fin)"); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 612 | if ((tbf->state_flags & |
| 613 | (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { |
| 614 | tbf->state_flags &= |
| 615 | ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); |
| 616 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " |
| 617 | "ack for UL TBF=%d\n", tbf->tfi); |
| 618 | } |
| 619 | tbf_free(tbf); |
| 620 | break; |
| 621 | } |
| 622 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
| 623 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] DOWNLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| 624 | /* reset N3105 */ |
| 625 | tbf->n3105 = 0; |
| 626 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 627 | debug_diagram(bts(), tbf->diag, "got CTL-ACK DL-ASS"); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 628 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 629 | tbf = bts()->tbf_by_tlli(tbf->tlli, |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 630 | GPRS_RLCMAC_DL_TBF); |
| 631 | if (!tbf) { |
| 632 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL " |
| 633 | "TBF is gone\n"); |
| 634 | break; |
| 635 | } |
| 636 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 637 | /* stop pending assignment timer */ |
Holger Hans Peter Freyther | 86300bb | 2013-10-26 18:01:35 +0200 | [diff] [blame] | 638 | tbf->stop_timer(); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 639 | if ((tbf->state_flags & |
| 640 | (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| 641 | tbf->state_flags &= |
| 642 | ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| 643 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink " |
| 644 | "assignment for DL TBF=%d\n", tbf->tfi); |
| 645 | } |
| 646 | tbf_assign_control_ts(tbf); |
| 647 | break; |
| 648 | } |
| 649 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
| 650 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [DOWNLINK] UPLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| 651 | /* reset N3105 */ |
| 652 | tbf->n3105 = 0; |
| 653 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 654 | debug_diagram(bts(), tbf->diag, "got CTL-AC UL-ASS"); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 655 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 656 | tbf = bts()->tbf_by_tlli(tbf->tlli, |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 657 | GPRS_RLCMAC_UL_TBF); |
| 658 | if (!tbf) { |
| 659 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL " |
| 660 | "TBF is gone\n"); |
| 661 | break; |
| 662 | } |
| 663 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 664 | if ((tbf->state_flags & |
| 665 | (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| 666 | tbf->state_flags &= |
| 667 | ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| 668 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " |
| 669 | "assignment for UL TBF=%d\n", tbf->tfi); |
| 670 | } |
| 671 | tbf_assign_control_ts(tbf); |
| 672 | break; |
| 673 | } |
| 674 | LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK " |
| 675 | "at no request\n"); |
| 676 | break; |
| 677 | case MT_PACKET_DOWNLINK_ACK_NACK: |
| 678 | tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI; |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 679 | tbf = bts()->tbf_by_poll_fn(fn, trx_no(), ts_no); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 680 | if (!tbf) { |
| 681 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
| 682 | "unknown FN=%u TFI=%d (TRX %d TS %d)\n", |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 683 | fn, tfi, trx_no(), ts_no); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 684 | break; |
| 685 | } |
| 686 | if (tbf->tfi != tfi) { |
| 687 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
| 688 | "wrong TFI=%d, ignoring!\n", tfi); |
| 689 | break; |
| 690 | } |
| 691 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK); |
| 692 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| 693 | tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 694 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink ack " |
| 695 | "for DL TBF=%d\n", tbf->tfi); |
| 696 | } |
| 697 | /* reset N3105 */ |
| 698 | tbf->n3105 = 0; |
Holger Hans Peter Freyther | 86300bb | 2013-10-26 18:01:35 +0200 | [diff] [blame] | 699 | tbf->stop_t3191(); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 700 | tlli = tbf->tlli; |
| 701 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli); |
| 702 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 703 | debug_diagram(bts(), tbf->diag, "got DL-ACK"); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 704 | |
| 705 | rc = gprs_rlcmac_downlink_ack(tbf, |
| 706 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.FINAL_ACK_INDICATION, |
| 707 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER, |
| 708 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP); |
| 709 | if (rc == 1) { |
| 710 | tbf_free(tbf); |
| 711 | break; |
| 712 | } |
| 713 | /* check for channel request */ |
| 714 | if (ul_control_block->u.Packet_Downlink_Ack_Nack.Exist_Channel_Request_Description) { |
| 715 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack " |
| 716 | "message, so we provide one:\n"); |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 717 | tbf_alloc_ul(bts_data(), tbf->trx_no, tbf->ms_class, tbf->tlli, tbf->ta, tbf); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 718 | /* schedule uplink assignment */ |
| 719 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
| 720 | } |
| 721 | break; |
| 722 | case MT_PACKET_RESOURCE_REQUEST: |
| 723 | if (ul_control_block->u.Packet_Resource_Request.ID.UnionType) { |
| 724 | tlli = ul_control_block->u.Packet_Resource_Request.ID.u.TLLI; |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 725 | tbf = bts()->tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 726 | if (tbf) { |
| 727 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 728 | "TLLI=0x%08x while UL TBF=%d still " |
| 729 | "exists. Killing pending DL TBF\n", |
| 730 | tlli, tbf->tfi); |
| 731 | tbf_free(tbf); |
| 732 | tbf = NULL; |
| 733 | } |
| 734 | if (!tbf) { |
| 735 | uint8_t ms_class = 0; |
| 736 | struct gprs_rlcmac_tbf *dl_tbf; |
| 737 | uint8_t ta; |
| 738 | |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 739 | if ((dl_tbf = bts()->tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF))) { |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 740 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 741 | "TLLI=0x%08x while DL TBF=%d still exists. " |
| 742 | "Killing pending DL TBF\n", tlli, |
| 743 | dl_tbf->tfi); |
| 744 | tbf_free(dl_tbf); |
| 745 | } |
| 746 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF " |
| 747 | "in packet ressource request of single " |
| 748 | "block, so we provide one:\n"); |
Holger Hans Peter Freyther | dea63b9 | 2013-10-26 18:56:43 +0200 | [diff] [blame] | 749 | sba = bts()->sba()->find(this, fn); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 750 | if (!sba) { |
| 751 | LOGP(DRLCMAC, LOGL_NOTICE, "MS requests UL TBF " |
| 752 | "in packet ressource request of single " |
| 753 | "block, but there is no resource request " |
| 754 | "scheduled!\n"); |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 755 | rc = bts()->timing_advance()->recall(tlli); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 756 | if (rc >= 0) |
| 757 | ta = rc; |
| 758 | else |
| 759 | ta = 0; |
| 760 | } else { |
| 761 | ta = sba->ta; |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 762 | bts()->timing_advance()->remember(tlli, ta); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 763 | llist_del(&sba->list); |
| 764 | talloc_free(sba); |
| 765 | } |
| 766 | if (ul_control_block->u.Packet_Resource_Request.Exist_MS_Radio_Access_capability) |
| 767 | ms_class = Decoding::get_ms_class_by_capability(&ul_control_block->u.Packet_Resource_Request.MS_Radio_Access_capability); |
| 768 | if (!ms_class) |
| 769 | LOGP(DRLCMAC, LOGL_NOTICE, "MS does not give us a class.\n"); |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 770 | tbf = tbf_alloc_ul(bts_data(), trx_no(), ms_class, tlli, ta, NULL); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 771 | if (!tbf) |
| 772 | break; |
| 773 | /* set control ts to current MS's TS, until assignment complete */ |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 774 | LOGP(DRLCMAC, LOGL_DEBUG, "Change control TS to %d until assinment is complete.\n", ts_no); |
| 775 | tbf->control_ts = ts_no; |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 776 | /* schedule uplink assignment */ |
| 777 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
| 778 | debug_diagram(bts->bts, tbf->diag, "Res. REQ"); |
| 779 | break; |
| 780 | } |
| 781 | tfi = tbf->tfi; |
| 782 | } else { |
| 783 | if (ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.UnionType) { |
| 784 | tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.DOWNLINK_TFI; |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 785 | tbf = tbf_by_tfi(bts_data(), tfi, trx_no(), GPRS_RLCMAC_DL_TBF); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 786 | if (!tbf) { |
| 787 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown downlink TBF=%d\n", tlli); |
| 788 | break; |
| 789 | } |
| 790 | } else { |
| 791 | tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.UPLINK_TFI; |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 792 | tbf = tbf_by_tfi(bts_data(), tfi, trx_no(), GPRS_RLCMAC_UL_TBF); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 793 | if (!tbf) { |
| 794 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TBF=%d\n", tlli); |
| 795 | break; |
| 796 | } |
| 797 | } |
| 798 | tlli = tbf->tlli; |
| 799 | } |
| 800 | LOGP(DRLCMAC, LOGL_ERROR, "RX: [PCU <- BTS] %s TFI: %u TLLI: 0x%08x FIXME: Packet ressource request\n", (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, tbf->tlli); |
| 801 | break; |
| 802 | case MT_PACKET_MEASUREMENT_REPORT: |
Holger Hans Peter Freyther | dea63b9 | 2013-10-26 18:56:43 +0200 | [diff] [blame] | 803 | sba = bts()->sba()->find(this, fn); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 804 | if (!sba) { |
| 805 | LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement " |
| 806 | "in packet ressource request of single " |
| 807 | "block, but there is no resource request " |
| 808 | "scheduled!\n"); |
| 809 | } else { |
Holger Hans Peter Freyther | 4f753c6 | 2013-10-26 18:45:19 +0200 | [diff] [blame] | 810 | bts()->timing_advance()->remember(ul_control_block->u.Packet_Measurement_Report.TLLI, sba->ta); |
Holger Hans Peter Freyther | fcbc702 | 2013-10-26 17:38:37 +0200 | [diff] [blame] | 811 | llist_del(&sba->list); |
| 812 | talloc_free(sba); |
| 813 | } |
| 814 | gprs_rlcmac_meas_rep(&ul_control_block->u.Packet_Measurement_Report); |
| 815 | break; |
| 816 | default: |
| 817 | LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] unknown control block received\n"); |
| 818 | } |
| 819 | talloc_free(ul_control_block); |
| 820 | return 1; |
| 821 | } |
| 822 | |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 823 | |
Holger Hans Peter Freyther | 6f9f434 | 2013-10-26 16:54:10 +0200 | [diff] [blame] | 824 | /* received RLC/MAC block from L1 */ |
Holger Hans Peter Freyther | 9ae367f | 2013-10-26 16:42:38 +0200 | [diff] [blame] | 825 | int gprs_rlcmac_pdch::rcv_block(uint8_t *data, uint8_t len, uint32_t fn, int8_t rssi) |
| 826 | { |
Holger Hans Peter Freyther | 6f9f434 | 2013-10-26 16:54:10 +0200 | [diff] [blame] | 827 | unsigned payload = data[0] >> 6; |
Holger Hans Peter Freyther | 6f9f434 | 2013-10-26 16:54:10 +0200 | [diff] [blame] | 828 | bitvec *block; |
| 829 | int rc = 0; |
| 830 | |
| 831 | switch (payload) { |
| 832 | case GPRS_RLCMAC_DATA_BLOCK: |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 833 | rc = rcv_data_block_acknowledged(data, len, rssi); |
Holger Hans Peter Freyther | 6f9f434 | 2013-10-26 16:54:10 +0200 | [diff] [blame] | 834 | break; |
| 835 | case GPRS_RLCMAC_CONTROL_BLOCK: |
| 836 | block = bitvec_alloc(len); |
| 837 | if (!block) |
| 838 | return -ENOMEM; |
| 839 | bitvec_unpack(block, data); |
Holger Hans Peter Freyther | 05f8efc | 2013-10-26 18:53:16 +0200 | [diff] [blame] | 840 | rc = rcv_control_block(block, fn); |
Holger Hans Peter Freyther | 6f9f434 | 2013-10-26 16:54:10 +0200 | [diff] [blame] | 841 | bitvec_free(block); |
| 842 | break; |
| 843 | case GPRS_RLCMAC_CONTROL_BLOCK_OPT: |
| 844 | LOGP(DRLCMAC, LOGL_NOTICE, "GPRS_RLCMAC_CONTROL_BLOCK_OPT block payload is not supported.\n"); |
| 845 | break; |
| 846 | default: |
| 847 | LOGP(DRLCMAC, LOGL_NOTICE, "Unknown RLCMAC block payload(%u).\n", payload); |
| 848 | rc = -EINVAL; |
| 849 | } |
| 850 | |
| 851 | return rc; |
Holger Hans Peter Freyther | 9ae367f | 2013-10-26 16:42:38 +0200 | [diff] [blame] | 852 | } |