Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 1 | /* Data block transfer |
| 2 | * |
| 3 | * Copyright (C) 2012 Ivan Klyuchnikov |
| 4 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version 2 |
| 9 | * of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | */ |
| 20 | |
| 21 | #include <gprs_bssgp_pcu.h> |
| 22 | #include <gprs_rlcmac.h> |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 23 | #include <pcu_l1_if.h> |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 24 | |
| 25 | /* After receiving these framess, we send ack/nack. */ |
| 26 | #define ACK_AFTER_FRAMES 20 |
| 27 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 28 | /* If acknowledgement to uplink/downlin assignmentshould be polled */ |
| 29 | #define POLLING_ASSIGNMENT 0 |
| 30 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 31 | extern "C" { |
| 32 | /* TS 04.60 10.2.2 */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 33 | struct rlc_ul_header { |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 34 | uint8_t r:1, |
| 35 | si:1, |
| 36 | cv:4, |
| 37 | pt:2; |
| 38 | uint8_t ti:1, |
| 39 | tfi:5, |
| 40 | pi:1, |
| 41 | spare:1; |
| 42 | uint8_t e:1, |
| 43 | bsn:7; |
| 44 | } __attribute__ ((packed)); |
| 45 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 46 | struct rlc_dl_header { |
| 47 | uint8_t usf:3, |
| 48 | s_p:1, |
| 49 | rrbp:2, |
| 50 | pt:2; |
| 51 | uint8_t fbi:1, |
| 52 | tfi:5, |
| 53 | pr:2; |
| 54 | uint8_t e:1, |
| 55 | bsn:7; |
| 56 | } __attribute__ ((packed)); |
| 57 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 58 | struct rlc_li_field { |
| 59 | uint8_t e:1, |
| 60 | m:1, |
| 61 | li:6; |
| 62 | } __attribute__ ((packed)); |
| 63 | } |
| 64 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 65 | int gprs_rlcmac_poll_timeout(struct gprs_rlcmac_tbf *tbf) |
| 66 | { |
| 67 | LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for TBF=%d\n", tbf->tfi); |
| 68 | |
| 69 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 70 | |
| 71 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
| 72 | LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET " |
| 73 | "CONTROL ACK for PACKET UPLINK ACK\n"); |
| 74 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
| 75 | if (tbf->state == GPRS_RLCMAC_FINISHED) { |
| 76 | tbf->dir.ul.n3103++; |
| 77 | if (tbf->dir.ul.n3103 == N3103_MAX) { |
| 78 | LOGP(DRLCMAC, LOGL_DEBUG, "- N3103 exceeded\n"); |
| 79 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
| 80 | tbf_timer_start(tbf, 3169, T3169); |
| 81 | return 0; |
| 82 | } |
| 83 | /* reschedule UL ack */ |
| 84 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 85 | } |
| 86 | } else |
| 87 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
| 88 | LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET " |
| 89 | "CONTROL ACK for PACKET UPLINK ASSIGNMENT.\n"); |
| 90 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 91 | } else |
| 92 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
| 93 | LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET " |
| 94 | "CONTROL ACK for PACKET DOWNLINK ASSIGNMENT.\n"); |
| 95 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 96 | /* in case out downlink assigment failed: */ |
| 97 | if (tbf->state == GPRS_RLCMAC_ASSIGN) { |
| 98 | LOGP(DRLCMAC, LOGL_DEBUG, "- Assignment failed\n"); |
| 99 | tbf_free(tbf); |
| 100 | } |
| 101 | } else |
| 102 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 103 | { |
| 104 | LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET " |
| 105 | " DOWNLINK ACK.\n"); |
| 106 | tbf->dir.dl.n3105++; |
| 107 | if (tbf->dir.dl.n3105 == N3105_MAX) { |
| 108 | LOGP(DRLCMAC, LOGL_DEBUG, "- N3105 exceeded\n"); |
| 109 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
| 110 | tbf_timer_start(tbf, 3195, T3195); |
| 111 | return 0; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | /* Received Uplink RLC control block. */ |
| 119 | int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint32_t fn) |
| 120 | { |
| 121 | uint8_t tfi = 0; |
| 122 | uint32_t tlli = 0; |
| 123 | struct gprs_rlcmac_tbf *tbf; |
| 124 | |
| 125 | RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)malloc(sizeof(RlcMacUplink_t)); |
| 126 | LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n"); |
| 127 | decode_gsm_rlcmac_uplink(rlc_block, ul_control_block); |
| 128 | LOGPC(DRLCMAC, LOGL_NOTICE, "\n"); |
| 129 | LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- RX : Uplink Control Block -------------------------\n"); |
| 130 | switch (ul_control_block->u.MESSAGE_TYPE) { |
| 131 | case MT_PACKET_CONTROL_ACK: |
| 132 | tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI; |
| 133 | tbf = tbf_by_poll_fn(fn); |
| 134 | if (!tbf) { |
| 135 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " |
| 136 | "unknown FN=%u TLL=0x%08x\n", fn, tlli); |
| 137 | break; |
| 138 | } |
| 139 | tfi = tbf->tfi; |
| 140 | if (tlli != tbf->tlli) { |
| 141 | LOGP(DRLCMAC, LOGL_NOTICE, "Phone changed TLLI to " |
| 142 | "0x%08x\n", tlli); |
| 143 | tbf->tlli = tlli; |
| 144 | } |
| 145 | LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Control Ack\n", tbf->tfi, tbf->tlli); |
| 146 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 147 | |
| 148 | /* check if this control ack belongs to packet uplink ack */ |
| 149 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
| 150 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| 151 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
| 152 | tbf_free(tbf); |
| 153 | break; |
| 154 | } |
| 155 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
| 156 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] DOWNLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| 157 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 158 | break; |
| 159 | } |
| 160 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
| 161 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] UPLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| 162 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 163 | break; |
| 164 | } |
| 165 | LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK " |
| 166 | "at no request\n"); |
| 167 | break; |
| 168 | case MT_PACKET_DOWNLINK_ACK_NACK: |
| 169 | tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI; |
| 170 | tbf = tbf_by_poll_fn(fn); |
| 171 | if (!tbf) { |
| 172 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
| 173 | "unknown FN=%u TFI=%d\n", fn, tfi); |
| 174 | break; |
| 175 | } |
| 176 | /* reset N3105 */ |
| 177 | tbf->dir.dl.n3105 = 0; |
| 178 | /* stop timer T3191 */ |
| 179 | tbf_timer_stop(tbf); |
| 180 | tlli = tbf->tlli; |
| 181 | LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli); |
| 182 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 183 | |
| 184 | gprs_rlcmac_downlink_ack(tbf, |
| 185 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.FINAL_ACK_INDICATION, |
| 186 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER, |
| 187 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP); |
| 188 | /* check for channel request */ |
| 189 | if (ul_control_block->u.Packet_Downlink_Ack_Nack.Exist_Channel_Request_Description) { |
| 190 | uint8_t trx, ts, usf; |
| 191 | struct gprs_rlcmac_tbf *ul_tbf; |
| 192 | |
| 193 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack " |
| 194 | "message, so we provide one:\n"); |
| 195 | uplink_request: |
| 196 | /* create new tbf */ |
| 197 | tfi = tfi_alloc(&trx, &ts); |
| 198 | if (tfi < 0) { |
| 199 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 200 | /* FIXME: send reject */ |
| 201 | break; |
| 202 | } |
| 203 | usf = find_free_usf(trx, ts); |
| 204 | if (usf < 0) { |
| 205 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource for USF\n"); |
| 206 | /* FIXME: send reject */ |
| 207 | break; |
| 208 | } |
| 209 | ul_tbf = tbf_alloc(tfi, trx, ts); |
| 210 | ul_tbf->tlli = tbf->tlli; |
| 211 | ul_tbf->tlli_valid = 1; /* no content resolution */ |
| 212 | ul_tbf->ta = tbf->ta; /* use current TA */ |
| 213 | ul_tbf->direction = GPRS_RLCMAC_UL_TBF; |
| 214 | ul_tbf->dir.ul.usf = usf; |
| 215 | tbf_new_state(ul_tbf, GPRS_RLCMAC_FLOW); |
| 216 | tbf_timer_start(ul_tbf, 3169, T3169); |
| 217 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] START TFI: %u\n", ul_tbf->tfi); |
| 218 | /* schedule uplink assignment */ |
| 219 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
| 220 | } |
| 221 | break; |
| 222 | case MT_PACKET_RESOURCE_REQUEST: |
| 223 | if (ul_control_block->u.Packet_Resource_Request.ID.UnionType) { |
| 224 | tlli = ul_control_block->u.Packet_Resource_Request.ID.u.TLLI; |
| 225 | tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); |
| 226 | if (!tbf) { |
| 227 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TLLI=0x%08x\n", tlli); |
| 228 | break; |
| 229 | } |
| 230 | tfi = tbf->tfi; |
| 231 | } else { |
| 232 | if (ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.UnionType) { |
| 233 | tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.DOWNLINK_TFI; |
| 234 | tbf = tbf_by_tfi(tfi, GPRS_RLCMAC_DL_TBF); |
| 235 | if (!tbf) { |
| 236 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown downlink TFI=%d\n", tlli); |
| 237 | break; |
| 238 | } |
| 239 | } else { |
| 240 | tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.UPLINK_TFI; |
| 241 | tbf = tbf_by_tfi(tfi, GPRS_RLCMAC_UL_TBF); |
| 242 | if (!tbf) { |
| 243 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TFI=%d\n", tlli); |
| 244 | break; |
| 245 | } |
| 246 | } |
| 247 | tlli = tbf->tlli; |
| 248 | } |
| 249 | LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet ressource request\n", tbf->tfi, tbf->tlli); |
| 250 | #warning FIXME |
| 251 | puts("FIXME: UL request during UL request"); exit(0); |
| 252 | |
| 253 | |
| 254 | break; |
| 255 | default: |
| 256 | LOGP(DRLCMAC, LOGL_ERROR, "RX: [PCU <- BTS] unknown control block received\n"); |
| 257 | } |
| 258 | free(ul_control_block); |
| 259 | return 1; |
| 260 | } |
| 261 | |
| 262 | |
| 263 | void tbf_timer_cb(void *_tbf) |
| 264 | { |
| 265 | struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf; |
| 266 | |
| 267 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF=%d timer %u expired.\n", tbf->tfi, |
| 268 | tbf->T); |
| 269 | |
| 270 | tbf->num_T_exp++; |
| 271 | |
| 272 | switch (tbf->T) { |
| 273 | #ifdef DEBUG_DL_ASS_IDLE |
| 274 | case 1234: |
| 275 | gprs_rlcmac_trigger_downlink_assignment(tbf, 0); |
| 276 | break; |
| 277 | #endif |
| 278 | case 0: /* assignment */ |
| 279 | /* change state to FLOW, so scheduler will start transmission */ |
| 280 | if (tbf->state == GPRS_RLCMAC_ASSIGN) |
| 281 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 282 | else |
| 283 | LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not in assign " |
| 284 | "state\n"); |
| 285 | break; |
| 286 | case 3169: |
| 287 | case 3191: |
| 288 | case 3193: |
| 289 | case 3195: |
| 290 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n"); |
| 291 | /* free TBF */ |
| 292 | tbf_free(tbf); |
| 293 | break; |
| 294 | default: |
| 295 | LOGP(DRLCMAC, LOGL_ERROR, "Timer expired in unknown mode: %u\n", |
| 296 | tbf->T); |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | /* |
| 301 | * UL data block flow |
| 302 | */ |
| 303 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 304 | /* get TLLI from received UL data block */ |
| 305 | static int tlli_from_ul_data(uint8_t *data, uint8_t len, uint32_t *tlli) |
| 306 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 307 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 308 | struct rlc_li_field *li; |
| 309 | uint8_t e; |
| 310 | |
| 311 | if (!rh->ti) |
| 312 | return -EINVAL; |
| 313 | |
| 314 | data += 3; |
| 315 | len -= 3; |
| 316 | e = rh->e; |
| 317 | /* if E is not set (LI follows) */ |
| 318 | while (!e) { |
| 319 | if (!len) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 320 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA LI extended, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 321 | "but no more data\n"); |
| 322 | return -EINVAL; |
| 323 | } |
| 324 | /* get new E */ |
| 325 | li = (struct rlc_li_field *)data; |
| 326 | if (li->e == 0) /* if LI==0, E is interpreted as '1' */ |
| 327 | e = 1; |
| 328 | else |
| 329 | e = li->e; |
| 330 | data++; |
| 331 | len--; |
| 332 | } |
| 333 | if (len < 4) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 334 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of frame " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 335 | "border\n"); |
| 336 | return -EINVAL; |
| 337 | } |
| 338 | *tlli = ntohl(*((uint32_t *)data)); |
| 339 | |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | /* Store received block data in LLC message(s) and forward to SGSN if complete. |
| 344 | */ |
| 345 | static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data, |
| 346 | uint8_t len) |
| 347 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 348 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 349 | uint8_t e, m; |
| 350 | struct rlc_li_field *li; |
| 351 | uint8_t frame_offset[16], offset = 0, chunk; |
| 352 | int i, frames = 0; |
| 353 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 354 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 355 | |
| 356 | data += 3; |
| 357 | len -= 3; |
| 358 | e = rh->e; /* if extended */ |
| 359 | m = 1; /* more frames, that means: the first frame */ |
| 360 | |
| 361 | /* Parse frame offsets from length indicator(s), if any. */ |
| 362 | while (1) { |
| 363 | if (frames == (int)sizeof(frame_offset)) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 364 | LOGP(DRLCMACUL, LOGL_ERROR, "Too many frames in " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 365 | "block\n"); |
| 366 | return -EINVAL; |
| 367 | } |
| 368 | frame_offset[frames++] = offset; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 369 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 370 | "%d\n", frames, offset); |
| 371 | if (!len) |
| 372 | break; |
| 373 | /* M == 0 and E == 0 is not allowed in this version. */ |
| 374 | if (!m && !e) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 375 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TFI=%d " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 376 | "ignored, because M='0' and E='0'.\n", |
| 377 | tbf->tfi); |
| 378 | return 0; |
| 379 | } |
| 380 | /* no more frames in this segment */ |
| 381 | if (e) { |
| 382 | break; |
| 383 | } |
| 384 | /* There is a new frame and an LI that delimits it. */ |
| 385 | if (m) { |
| 386 | li = (struct rlc_li_field *)data; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 387 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n", |
| 388 | li->li); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 389 | /* Special case: LI == 0 |
| 390 | * If the last segment would fit precisely into the |
| 391 | * rest of the RLC MAC block, there would be no way |
| 392 | * to delimit that this segment ends and is not |
| 393 | * continued in the next block. |
| 394 | * The special LI (0) is used to force the segment to |
| 395 | * extend into the next block, so it is delimited there. |
| 396 | * This LI must be skipped. Also it is the last LI. |
| 397 | */ |
| 398 | if (li->li == 0) { |
| 399 | data++; |
| 400 | len--; |
| 401 | m = 1; /* M is ignored, we know there is more */ |
| 402 | break; /* handle E as '1', so we break! */ |
| 403 | } |
| 404 | e = li->e; |
| 405 | m = li->m; |
| 406 | offset += li->li; |
| 407 | data++; |
| 408 | len--; |
| 409 | continue; |
| 410 | } |
| 411 | } |
| 412 | if (!m) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 413 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 414 | "data\n"); |
| 415 | } |
| 416 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 417 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 418 | len); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 419 | /* TLLI */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 420 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 421 | if (len < 4) { |
| 422 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of " |
| 423 | "frame border\n"); |
| 424 | return -EINVAL; |
| 425 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 426 | data += 4; |
| 427 | len -= 4; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 428 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: " |
| 429 | "%d\n", len); |
| 430 | } |
| 431 | |
| 432 | /* PFI */ |
| 433 | if (rh->pi) { |
| 434 | LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, " |
| 435 | "please disable in SYSTEM INFORMATION\n"); |
| 436 | if (len < 1) { |
| 437 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA PFI out of " |
| 438 | "frame border\n"); |
| 439 | return -EINVAL; |
| 440 | } |
| 441 | data++; |
| 442 | len--; |
| 443 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 444 | "%d\n", len); |
| 445 | } |
| 446 | |
| 447 | /* Now we have: |
| 448 | * - a list of frames offsets: frame_offset[] |
| 449 | * - number of frames: i |
| 450 | * - m == 0: Last frame carries spare data (end of TBF). |
| 451 | */ |
| 452 | |
| 453 | /* Check if last offset would exceed frame. */ |
| 454 | if (offset > len) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 455 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TFI=%d ignored, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 456 | "because LI exceeds frame length.\n", tbf->tfi); |
| 457 | return -EINVAL; |
| 458 | } |
| 459 | |
| 460 | /* create LLC frames */ |
| 461 | for (i = 0; i < frames; i++) { |
| 462 | /* last frame ? */ |
| 463 | if (i == frames - 1) { |
| 464 | /* no more data in last frame */ |
| 465 | if (!m) |
| 466 | break; |
| 467 | /* data until end of frame */ |
| 468 | chunk = len - frame_offset[i]; |
| 469 | } else { |
| 470 | /* data until next frame */ |
| 471 | chunk = frame_offset[i + 1] - frame_offset[i]; |
| 472 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 473 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 474 | "frame at %d.\n", chunk, tbf->llc_index); |
| 475 | if (tbf->llc_index + chunk > LLC_MAX_LEN) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 476 | LOGP(DRLCMACUL, LOGL_NOTICE, "LLC frame exceeds " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 477 | "maximum size.\n"); |
| 478 | chunk = LLC_MAX_LEN - tbf->llc_index; |
| 479 | } |
| 480 | memcpy(tbf->llc_frame + tbf->llc_index, data + frame_offset[i], |
| 481 | chunk); |
| 482 | tbf->llc_index += chunk; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 483 | /* not last frame. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 484 | if (i != frames - 1) { |
| 485 | /* send frame to SGSN */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 486 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 487 | "TFI=%d: %s\n", tbf->tfi, |
| 488 | osmo_hexdump(tbf->llc_frame, tbf->llc_index)); |
| 489 | gprs_rlcmac_tx_ul_ud(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 490 | tbf->llc_index = 0; /* reset frame space */ |
| 491 | /* also check if CV==0, because the frame may fill up the |
| 492 | * block precisely, then it is also complete. normally the |
| 493 | * frame would be extended into the next block with a 0-length |
| 494 | * delimiter added to this block. */ |
| 495 | } else if (rh->cv == 0) { |
| 496 | /* send frame to SGSN */ |
| 497 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
| 498 | "TFI=%d that fits precisely in last block: " |
| 499 | "%s\n", tbf->tfi, |
| 500 | osmo_hexdump(tbf->llc_frame, tbf->llc_index)); |
| 501 | gprs_rlcmac_tx_ul_ud(tbf); |
| 502 | tbf->llc_index = 0; /* reset frame space */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 503 | } |
| 504 | } |
| 505 | |
| 506 | return 0; |
| 507 | } |
| 508 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 509 | struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_tbf *tbf, |
| 510 | uint32_t fn) |
| 511 | { |
| 512 | int final = (tbf->state == GPRS_RLCMAC_FINISHED); |
| 513 | struct msgb *msg; |
| 514 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 515 | if (final && tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 516 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 517 | "sheduled for TBF=%d, so we must wait for final uplink " |
| 518 | "ack...\n", tbf->tfi); |
| 519 | return NULL; |
| 520 | } |
| 521 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 522 | msg = msgb_alloc(23, "rlcmac_ul_ack"); |
| 523 | if (!msg) |
| 524 | return NULL; |
| 525 | bitvec *ack_vec = bitvec_alloc(23); |
| 526 | if (!ack_vec) { |
| 527 | msgb_free(msg); |
| 528 | return NULL; |
| 529 | } |
| 530 | bitvec_unhex(ack_vec, |
| 531 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 532 | write_packet_uplink_ack(ack_vec, tbf, final); |
| 533 | bitvec_pack(ack_vec, msgb_put(msg, 23)); |
| 534 | bitvec_free(ack_vec); |
| 535 | |
| 536 | if (final) { |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 537 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 538 | tbf->poll_fn = (fn + 13) % 2715648; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 539 | /* waiting for final acknowledge */ |
| 540 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 541 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 542 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 543 | |
| 544 | return msg; |
| 545 | } |
| 546 | |
| 547 | /* receive UL data block |
| 548 | * |
| 549 | * The blocks are defragmented and forwarded as LLC frames, if complete. |
| 550 | */ |
| 551 | int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t *data, uint8_t len) |
| 552 | { |
| 553 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 554 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 555 | uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index; |
| 556 | int rc; |
| 557 | |
| 558 | if (len < 23) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 559 | LOGP(DRLCMACUL, LOGL_ERROR, "Dropping short frame " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 560 | "(len = %d)\n", len); |
| 561 | return -EINVAL; |
| 562 | } |
| 563 | |
| 564 | /* find TBF inst from given TFI */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 565 | tbf = tbf_by_tfi(rh->tfi, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 566 | if (!tbf) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 567 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TFI=%d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 568 | rh->tfi); |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | if (tbf->direction != GPRS_RLCMAC_UL_TBF) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 573 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TFI=%d not Uplink " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 574 | "tbf\n", rh->tfi); |
| 575 | return 0; |
| 576 | } |
| 577 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 578 | LOGP(DRLCMACUL, LOGL_INFO, "UL DATA TFI=%d received (V(Q)=%d .. " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 579 | "V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r); |
| 580 | |
| 581 | /* get TLLI */ |
| 582 | if (!tbf->tlli_valid) { |
| 583 | /* no TLLI yet */ |
| 584 | if (!rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 585 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TFI=%d without " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 586 | "TLLI, but no TLLI received yet\n", rh->tfi); |
| 587 | return 0; |
| 588 | } |
| 589 | rc = tlli_from_ul_data(data, len, &tbf->tlli); |
| 590 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 591 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 592 | "of UL DATA TFI=%d.\n", rh->tfi); |
| 593 | return 0; |
| 594 | } |
| 595 | tbf->tlli_valid = 1; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 596 | LOGP(DRLCMACUL, LOGL_DEBUG, " Decoded premier TLLI=0x%08x of " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 597 | "UL DATA TFI=%d.\n", tbf->tlli, rh->tfi); |
| 598 | /* already have TLLI, but we stille get another one */ |
| 599 | } else if (rh->ti) { |
| 600 | uint32_t tlli; |
| 601 | rc = tlli_from_ul_data(data, len, &tlli); |
| 602 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 603 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 604 | "of UL DATA TFI=%d.\n", rh->tfi); |
| 605 | return 0; |
| 606 | } |
| 607 | if (tlli != tbf->tlli) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 608 | LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 609 | "DATA TFI=%d. (Ignoring due to contention " |
| 610 | "resolution)\n", rh->tfi); |
| 611 | return 0; |
| 612 | } |
| 613 | } |
| 614 | |
| 615 | mod_sns = tbf->sns - 1; |
| 616 | mod_sns_half = (tbf->sns >> 1) - 1; |
| 617 | |
| 618 | /* restart T3169 */ |
| 619 | tbf_timer_start(tbf, 3169, T3169); |
| 620 | |
| 621 | /* Increment RX-counter */ |
| 622 | tbf->dir.ul.rx_counter++; |
| 623 | |
| 624 | /* current block relative to lowest unreceived block */ |
| 625 | offset_v_q = (rh->bsn - tbf->dir.ul.v_q) & mod_sns; |
| 626 | /* If out of window (may happen if blocks below V(Q) are received |
| 627 | * again. */ |
| 628 | if (offset_v_q >= tbf->ws) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 629 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 630 | "%d..%d (it's normal)\n", rh->bsn, tbf->dir.ul.v_q, |
| 631 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 632 | return 0; |
| 633 | } |
| 634 | /* Write block to buffer and set receive state array. */ |
| 635 | index = rh->bsn & mod_sns_half; /* memory index of block */ |
| 636 | memcpy(tbf->rlc_block[index], data, len); /* Copy block. */ |
| 637 | tbf->rlc_block_len[index] = len; |
| 638 | tbf->dir.ul.v_n[index] = 'R'; /* Mark received block. */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 639 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 640 | rh->bsn, tbf->dir.ul.v_q, |
| 641 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 642 | /* Raise V(R) to highest received sequence number not received. */ |
| 643 | offset_v_r = (rh->bsn + 1 - tbf->dir.ul.v_r) & mod_sns; |
| 644 | if (offset_v_r < (tbf->sns >> 1)) { /* Positive offset, so raise. */ |
| 645 | while (offset_v_r--) { |
| 646 | if (offset_v_r) /* all except the received block */ |
| 647 | tbf->dir.ul.v_n[tbf->dir.ul.v_r & mod_sns_half] |
| 648 | = 'N'; /* Mark block as not received */ |
| 649 | tbf->dir.ul.v_r = (tbf->dir.ul.v_r + 1) & mod_sns; |
| 650 | /* Inc V(R). */ |
| 651 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 652 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 653 | tbf->dir.ul.v_r); |
| 654 | } |
| 655 | |
| 656 | /* Raise V(Q) if possible, and retrieve LLC frames from blocks. |
| 657 | * This is looped until there is a gap (non received block) or |
| 658 | * the window is empty.*/ |
| 659 | while (tbf->dir.ul.v_q != tbf->dir.ul.v_r && tbf->dir.ul.v_n[ |
| 660 | (index = tbf->dir.ul.v_q & mod_sns_half)] == 'R') { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 661 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 662 | "V(Q) to %d\n", tbf->dir.ul.v_q, |
| 663 | (tbf->dir.ul.v_q + 1) & mod_sns); |
| 664 | /* get LLC data from block */ |
| 665 | gprs_rlcmac_assemble_llc(tbf, tbf->rlc_block[index], |
| 666 | tbf->rlc_block_len[index]); |
| 667 | /* raise V(Q), because block already received */ |
| 668 | tbf->dir.ul.v_q = (tbf->dir.ul.v_q + 1) & mod_sns; |
| 669 | } |
| 670 | |
| 671 | /* Check CV of last frame in buffer */ |
| 672 | if (tbf->state == GPRS_RLCMAC_FLOW /* still in flow state */ |
| 673 | && tbf->dir.ul.v_q == tbf->dir.ul.v_r) { /* if complete */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 674 | struct rlc_ul_header *last_rh = (struct rlc_ul_header *) |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 675 | tbf->rlc_block[(tbf->dir.ul.v_r - 1) & mod_sns_half]; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 676 | LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 677 | "last block: BSN=%d CV=%d\n", last_rh->bsn, |
| 678 | last_rh->cv); |
| 679 | if (last_rh->cv == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 680 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 681 | "TBF\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 682 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 683 | /* Reset N3103 counter. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 684 | tbf->dir.ul.n3103 = 0; |
| 685 | } |
| 686 | } |
| 687 | |
| 688 | /* If TLLI is included or if we received half of the window, we send |
| 689 | * an ack/nack */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 690 | if (rh->si || rh->ti || tbf->state == GPRS_RLCMAC_FINISHED |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 691 | || (tbf->dir.ul.rx_counter % ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 692 | if (rh->si) { |
| 693 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
| 694 | "because MS is stalled.\n"); |
| 695 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 696 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 697 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 698 | "because TLLI is included.\n"); |
| 699 | } |
| 700 | if (tbf->state == GPRS_RLCMAC_FINISHED) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 701 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 702 | "because last block has CV==0.\n"); |
| 703 | } |
| 704 | if ((tbf->dir.ul.rx_counter % ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 705 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 706 | "because %d frames received.\n", |
| 707 | ACK_AFTER_FRAMES); |
| 708 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 709 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) { |
| 710 | /* trigger sending at next RTS */ |
| 711 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 712 | } else { |
| 713 | /* already triggered */ |
| 714 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Sending Ack/Nack is " |
| 715 | "already triggered, don't schedule!\n"); |
| 716 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 717 | } |
| 718 | |
| 719 | return 0; |
| 720 | } |
| 721 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame^] | 722 | struct msgb *gprs_rlcmac_send_packet_uplink_assignment( |
| 723 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 724 | { |
| 725 | struct msgb *msg; |
| 726 | struct gprs_rlcmac_tbf *new_tbf; |
| 727 | |
| 728 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 729 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 730 | "sheduled for TBF=%d, so we must wait for uplink " |
| 731 | "assignment...\n", tbf->tfi); |
| 732 | return NULL; |
| 733 | } |
| 734 | |
| 735 | /* on down TBF we get the uplink TBF to be assigned. */ |
| 736 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 737 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); |
| 738 | else |
| 739 | new_tbf = tbf; |
| 740 | |
| 741 | if (!new_tbf) { |
| 742 | LOGP(DRLCMACUL, LOGL_ERROR, "We have a schedule for uplink " |
| 743 | "assignment at downlink TBF=%d, but there is no uplink " |
| 744 | "TBF\n", tbf->tfi); |
| 745 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 746 | return NULL; |
| 747 | } |
| 748 | |
| 749 | msg = msgb_alloc(23, "rlcmac_ul_ass"); |
| 750 | if (!msg) |
| 751 | return NULL; |
| 752 | bitvec *ass_vec = bitvec_alloc(23); |
| 753 | if (!ass_vec) { |
| 754 | msgb_free(msg); |
| 755 | return NULL; |
| 756 | } |
| 757 | bitvec_unhex(ass_vec, |
| 758 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 759 | write_packet_uplink_assignment(ass_vec, tbf->tfi, |
| 760 | (tbf->direction == GPRS_RLCMAC_DL_TBF), 0, 0, new_tbf->tfi, |
| 761 | new_tbf->dir.ul.usf, new_tbf->arfcn, new_tbf->ts, new_tbf->ta, |
| 762 | new_tbf->tsc, POLLING_ASSIGNMENT); |
| 763 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
| 764 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t)); |
| 765 | LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ TX : Packet Uplink Assignment +++++++++++++++++++++++++\n"); |
| 766 | decode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
| 767 | LOGPC(DRLCMAC, LOGL_NOTICE, "\n"); |
| 768 | LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Packet Uplink Assignment -------------------------\n"); |
| 769 | bitvec_free(ass_vec); |
| 770 | |
| 771 | #if POLLING_ASSIGNMENT == 1 |
| 772 | FIXME process does not work, also the acknowledgement is not checked. |
| 773 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 774 | tbf->poll_fn = (fn + 13) % 2715648; |
| 775 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK; |
| 776 | #else |
| 777 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 778 | #endif |
| 779 | |
| 780 | return msg; |
| 781 | } |
| 782 | |
| 783 | int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta) |
| 784 | { |
| 785 | struct gprs_rlcmac_tbf *tbf; |
| 786 | uint8_t trx, ts; |
| 787 | int tfi, usf; /* must be signed */ |
| 788 | |
| 789 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide " |
| 790 | "one:\n"); |
| 791 | // Create new TBF |
| 792 | tfi = tfi_alloc(&trx, &ts); |
| 793 | if (tfi < 0) { |
| 794 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 795 | /* FIXME: send reject */ |
| 796 | return -EBUSY; |
| 797 | } |
| 798 | usf = find_free_usf(trx, ts); |
| 799 | if (usf < 0) { |
| 800 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource for USF\n"); |
| 801 | /* FIXME: send reject */ |
| 802 | return -EBUSY; |
| 803 | } |
| 804 | tbf = tbf_alloc(tfi, trx, ts); |
| 805 | if (qta < 0) |
| 806 | qta = 0; |
| 807 | if (qta > 252) |
| 808 | qta = 252; |
| 809 | tbf->ta = qta >> 2; |
| 810 | tbf->direction = GPRS_RLCMAC_UL_TBF; |
| 811 | tbf->dir.ul.usf = usf; |
| 812 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 813 | tbf_timer_start(tbf, 3169, T3169); |
| 814 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] START TFI: %u\n", tbf->tfi); |
| 815 | LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u RACH qbit-ta=%d ra=%d, Fn=%d (%d,%d,%d)\n", tbf->tfi, qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); |
| 816 | LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u Packet Immidiate Assignment\n", tbf->tfi); |
| 817 | bitvec *immediate_assignment = bitvec_alloc(23); |
| 818 | bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 819 | int len = write_immediate_assignment(immediate_assignment, 0, ra, Fn, tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi, usf, 0, 0, 0); |
| 820 | pcu_l1if_tx_agch(immediate_assignment, len); |
| 821 | bitvec_free(immediate_assignment); |
| 822 | |
| 823 | return 0; |
| 824 | } |
| 825 | |
| 826 | |
| 827 | /* |
| 828 | * DL data block flow |
| 829 | */ |
| 830 | |
| 831 | /* send DL data block |
| 832 | * |
| 833 | * The messages are fragmented and forwarded as data blocks. |
| 834 | */ |
| 835 | struct msgb *gprs_rlcmac_send_data_block_acknowledged( |
| 836 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 837 | { |
| 838 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 839 | struct rlc_dl_header *rh; |
| 840 | struct rlc_li_field *li; |
| 841 | uint8_t block_length; /* total length of block, including spare bits */ |
| 842 | uint8_t block_data; /* usable data of block, w/o spare bits, inc. MAC */ |
| 843 | struct msgb *msg, *dl_msg; |
| 844 | uint8_t bsn; |
| 845 | uint16_t mod_sns = tbf->sns - 1; |
| 846 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 847 | uint16_t index; |
| 848 | uint8_t *delimiter, *data, *e_pointer; |
| 849 | uint8_t len; |
| 850 | uint16_t space, chunk; |
| 851 | |
| 852 | LOGP(DRLCMACDL, LOGL_INFO, "DL DATA TFI=%d downlink (V(A)==%d .. " |
| 853 | "V(S)==%d)\n", tbf->tfi, tbf->dir.dl.v_a, tbf->dir.dl.v_s); |
| 854 | |
| 855 | do_resend: |
| 856 | /* check if there is a block with negative acknowledgement */ |
| 857 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 858 | bsn = (bsn + 1) & mod_sns) { |
| 859 | index = (bsn & mod_sns_half); |
| 860 | if (tbf->dir.dl.v_b[index] == 'N' |
| 861 | || tbf->dir.dl.v_b[index] == 'X') { |
| 862 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", |
| 863 | bsn); |
| 864 | /* re-send block with negative aknowlegement */ |
| 865 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 866 | goto tx_block; |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | /* if the window has stalled, or transfer is complete, |
| 871 | * send an unacknowledged block */ |
| 872 | if (tbf->state == GPRS_RLCMAC_FINISHED |
| 873 | || ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns) == tbf->ws) { |
| 874 | int resend = 0; |
| 875 | |
| 876 | if (tbf->state == GPRS_RLCMAC_FINISHED) |
| 877 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 878 | "because all blocks have been transmitted.\n", |
| 879 | tbf->dir.dl.v_a); |
| 880 | else |
| 881 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 882 | "because all window is stalled.\n", |
| 883 | tbf->dir.dl.v_a); |
| 884 | /* If V(S) == V(A) and finished state, we would have received |
| 885 | * acknowledgement of all transmitted block. In this case we |
| 886 | * would have transmitted the final block, and received ack |
| 887 | * from MS. But in this case we did not receive the final ack |
| 888 | * indication from MS. This should never happen if MS works |
| 889 | * correctly. */ |
| 890 | if (tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
| 891 | LOGP(DRLCMACDL, LOGL_ERROR, "- MS acked all block " |
| 892 | "(including final block), but did not include " |
| 893 | "FINAL_ACK_INDICATION!\n"); |
| 894 | /* we just send final block again */ |
| 895 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 896 | goto tx_block; |
| 897 | } |
| 898 | |
| 899 | /* cycle through all unacked blocks */ |
| 900 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 901 | bsn = (bsn + 1) & mod_sns) { |
| 902 | index = (bsn & mod_sns_half); |
| 903 | if (tbf->dir.dl.v_b[index] == 'U') { |
| 904 | /* mark to be re-send */ |
| 905 | tbf->dir.dl.v_b[index] = 'X'; |
| 906 | resend++; |
| 907 | } |
| 908 | } |
| 909 | /* At this point there should be at leasst one unacked block |
| 910 | * to be resent. If not, this is an software error. */ |
| 911 | if (resend == 0) { |
| 912 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 913 | "There are no unacknowledged blocks, but V(A) " |
| 914 | " != V(S). PLEASE FIX!\n"); |
| 915 | /* we just send final block again */ |
| 916 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 917 | goto tx_block; |
| 918 | } |
| 919 | goto do_resend; |
| 920 | } |
| 921 | |
| 922 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n", |
| 923 | tbf->dir.dl.v_s); |
| 924 | |
| 925 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 926 | index = tbf->dir.dl.v_s & mod_sns_half; |
| 927 | data = tbf->rlc_block[index]; |
| 928 | switch (bts->cs) { |
| 929 | case 2: /* CS-2 */ |
| 930 | block_length = 34; |
| 931 | block_data = 33; |
| 932 | break; |
| 933 | case 3: /* CS-3 */ |
| 934 | block_length = 40; |
| 935 | block_data = 39; |
| 936 | break; |
| 937 | case 4: /* CS-4 */ |
| 938 | block_length = 54; |
| 939 | block_data = 53; |
| 940 | break; |
| 941 | default: /* CS-1 */ |
| 942 | block_length = 23; |
| 943 | block_data = 23; |
| 944 | } |
| 945 | memset(data, 0x2b, block_data); /* spare bits will be left 0 */ |
| 946 | rh = (struct rlc_dl_header *)data; |
| 947 | rh->pt = 0; /* Data Block */ |
| 948 | rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */ |
| 949 | rh->usf = 7; /* will be set at scheduler */ |
| 950 | rh->pr = 0; /* FIXME: power reduction */ |
| 951 | rh->tfi = tbf->tfi; /* TFI */ |
| 952 | rh->fbi = 0; /* Final Block Indicator, set late, if true */ |
| 953 | rh->bsn = tbf->dir.dl.v_s; /* Block Sequence Number */ |
| 954 | rh->e = 0; /* Extension bit, maybe set later */ |
| 955 | e_pointer = data + 2; /* points to E of current chunk */ |
| 956 | data += 3; |
| 957 | delimiter = data; /* where next length header would be stored */ |
| 958 | space = block_data - 3; |
| 959 | while (1) { |
| 960 | chunk = tbf->llc_length - tbf->llc_index; |
| 961 | /* if chunk will exceed block limit */ |
| 962 | if (chunk > space) { |
| 963 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 964 | "larger than space (%d) left in block: copy " |
| 965 | "only remaining space, and we are done\n", |
| 966 | chunk, space); |
| 967 | /* block is filled, so there is no extension */ |
| 968 | *e_pointer |= 0x01; |
| 969 | /* fill only space */ |
| 970 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 971 | /* incement index */ |
| 972 | tbf->llc_index += space; |
| 973 | /* return data block as message */ |
| 974 | break; |
| 975 | } |
| 976 | /* if FINAL chunk would fit precisely in space left */ |
| 977 | if (chunk == space && llist_empty(&tbf->llc_queue)) { |
| 978 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 979 | "would exactly fit into space (%d): because " |
| 980 | "this is a final block, we don't add length " |
| 981 | "header, and we are done\n", chunk, space); |
| 982 | /* block is filled, so there is no extension */ |
| 983 | *e_pointer |= 0x01; |
| 984 | /* fill space */ |
| 985 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 986 | /* reset LLC frame */ |
| 987 | tbf->llc_index = tbf->llc_length = 0; |
| 988 | /* final block */ |
| 989 | rh->fbi = 1; /* we indicate final block */ |
| 990 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 991 | /* return data block as message */ |
| 992 | break; |
| 993 | } |
| 994 | /* if chunk would fit exactly in space left */ |
| 995 | if (chunk == space) { |
| 996 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 997 | "would exactly fit into space (%d): add length " |
| 998 | "header with LI=0, to make frame extend to " |
| 999 | "next block, and we are done\n", chunk, space); |
| 1000 | /* make space for delimiter */ |
| 1001 | if (delimiter != data) |
| 1002 | memcpy(delimiter + 1, delimiter, |
| 1003 | data - delimiter); |
| 1004 | data++; |
| 1005 | space--; |
| 1006 | /* add LI with 0 length */ |
| 1007 | li = (struct rlc_li_field *)delimiter; |
| 1008 | li->e = 1; /* not more extension */ |
| 1009 | li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| 1010 | li->li = 0; /* chunk fills the complete space */ |
| 1011 | // no need to set e_pointer nor increase delimiter |
| 1012 | /* fill only space, which is 1 octet less than chunk */ |
| 1013 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1014 | /* incement index */ |
| 1015 | tbf->llc_index += space; |
| 1016 | /* return data block as message */ |
| 1017 | break; |
| 1018 | } |
| 1019 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 1020 | "than remaining space (%d): add length header to " |
| 1021 | "to delimit LLC frame\n", chunk, space); |
| 1022 | /* the LLC frame chunk ends in this block */ |
| 1023 | /* make space for delimiter */ |
| 1024 | if (delimiter != data) |
| 1025 | memcpy(delimiter + 1, delimiter, data - delimiter); |
| 1026 | data++; |
| 1027 | space--; |
| 1028 | /* add LI to delimit frame */ |
| 1029 | li = (struct rlc_li_field *)delimiter; |
| 1030 | li->e = 0; /* Extension bit, maybe set later */ |
| 1031 | li->m = 0; /* will be set later, if there is more LLC data */ |
| 1032 | li->li = chunk; /* length of chunk */ |
| 1033 | e_pointer = delimiter; /* points to E of current delimiter */ |
| 1034 | delimiter++; |
| 1035 | /* copy (rest of) LLC frame to space */ |
| 1036 | memcpy(data, tbf->llc_frame + tbf->llc_index, chunk); |
| 1037 | data += chunk; |
| 1038 | space -= chunk; |
| 1039 | /* reset LLC frame */ |
| 1040 | tbf->llc_index = tbf->llc_length = 0; |
| 1041 | /* dequeue next LLC frame, if any */ |
| 1042 | msg = msgb_dequeue(&tbf->llc_queue); |
| 1043 | if (msg) { |
| 1044 | LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC " |
| 1045 | "(len=%d)\n", msg->len); |
| 1046 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1047 | tbf->llc_length = msg->len; |
| 1048 | msgb_free(msg); |
| 1049 | } |
| 1050 | /* if we have more data and we have space left */ |
| 1051 | if (space > 0 && tbf->llc_length) { |
| 1052 | li->m = 1; /* we indicate more frames to follow */ |
| 1053 | continue; |
| 1054 | } |
| 1055 | /* if we don't have more LLC frames */ |
| 1056 | if (!tbf->llc_length) { |
| 1057 | LOGP(DRLCMACDL, LOGL_INFO, "-- Final block, so we " |
| 1058 | "done.\n"); |
| 1059 | li->e = 1; /* we cannot extend */ |
| 1060 | rh->fbi = 1; /* we indicate final block */ |
| 1061 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1062 | break; |
| 1063 | } |
| 1064 | /* we have no space left */ |
| 1065 | LOGP(DRLCMACDL, LOGL_INFO, "-- No space left, so we are " |
| 1066 | "done.\n"); |
| 1067 | li->e = 1; /* we cannot extend */ |
| 1068 | break; |
| 1069 | } |
| 1070 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n", |
| 1071 | osmo_hexdump(tbf->rlc_block[index], block_length)); |
| 1072 | tbf->rlc_block_len[index] = block_length; |
| 1073 | /* raise send state and set ack state array */ |
| 1074 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 1075 | tbf->dir.dl.v_s = (tbf->dir.dl.v_s + 1) & mod_sns; /* inc send state */ |
| 1076 | |
| 1077 | tx_block: |
| 1078 | /* from this point on, new block is sent or old block is resent */ |
| 1079 | |
| 1080 | /* get data and header from current block */ |
| 1081 | data = tbf->rlc_block[index]; |
| 1082 | len = tbf->rlc_block_len[index]; |
| 1083 | rh = (struct rlc_dl_header *)data; |
| 1084 | |
| 1085 | /* Increment TX-counter */ |
| 1086 | tbf->dir.dl.tx_counter++; |
| 1087 | |
| 1088 | /* Clear Polling, if still set in history buffer */ |
| 1089 | rh->s_p = 0; |
| 1090 | |
| 1091 | /* poll after ACK_AFTER_FRAMES frames, or when final block is tx. */ |
| 1092 | if (rh->fbi == 1 || (tbf->dir.dl.tx_counter % ACK_AFTER_FRAMES) == 0) { |
| 1093 | if (rh->fbi == 1) { |
| 1094 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 1095 | "polling, because final block sent.\n"); |
| 1096 | } |
| 1097 | if ((tbf->dir.dl.tx_counter % ACK_AFTER_FRAMES) == 0) { |
| 1098 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 1099 | "polling, because %d blocks sent.\n", |
| 1100 | ACK_AFTER_FRAMES); |
| 1101 | } |
| 1102 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) |
| 1103 | LOGP(DRLCMACDL, LOGL_NOTICE, "Polling is already " |
| 1104 | "sheduled for TBF=%d, so we must wait for " |
| 1105 | "requesting downlink ack\n", tbf->tfi); |
| 1106 | else { |
| 1107 | /* start timer whenever we send the final block */ |
| 1108 | if (rh->fbi == 1) |
| 1109 | tbf_timer_start(tbf, 3191, T3191); |
| 1110 | |
| 1111 | /* schedule polling */ |
| 1112 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1113 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1114 | |
| 1115 | /* set polling in header */ |
| 1116 | rh->rrbp = 0; /* N+13 */ |
| 1117 | rh->s_p = 1; /* Polling */ |
| 1118 | } |
| 1119 | } |
| 1120 | |
| 1121 | /* return data block as message */ |
| 1122 | dl_msg = msgb_alloc(len, "rlcmac_dl_data"); |
| 1123 | if (!dl_msg) |
| 1124 | return NULL; |
| 1125 | memcpy(msgb_put(dl_msg, len), data, len); |
| 1126 | |
| 1127 | return dl_msg; |
| 1128 | } |
| 1129 | |
| 1130 | int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final, |
| 1131 | uint8_t ssn, uint8_t *rbb) |
| 1132 | { |
| 1133 | char show_rbb[65], show_v_b[RLC_MAX_SNS + 1]; |
| 1134 | uint16_t mod_sns = tbf->sns - 1; |
| 1135 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 1136 | int i; /* must be signed */ |
| 1137 | int16_t dist; /* must be signed */ |
| 1138 | uint8_t bit; |
| 1139 | uint16_t bsn; |
| 1140 | struct msgb *msg; |
| 1141 | |
| 1142 | LOGP(DRLCMACDL, LOGL_INFO, "TFI=%d downlink acknowledge\n", |
| 1143 | tbf->tfi); |
| 1144 | |
| 1145 | if (!final) { |
| 1146 | /* show received array in debug (bit 64..1) */ |
| 1147 | for (i = 63; i >= 0; i--) { |
| 1148 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1149 | show_rbb[i] = (bit) ? '1' : 'o'; |
| 1150 | } |
| 1151 | show_rbb[64] = '\0'; |
| 1152 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
| 1153 | "(BSN=%d) 1=ACK o=NACK\n", ssn - 64, show_rbb, |
| 1154 | ssn - 1); |
| 1155 | |
| 1156 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 1157 | /* calculate distance of ssn from V(S) */ |
| 1158 | dist = (tbf->dir.dl.v_s - ssn) & mod_sns; |
| 1159 | /* check if distance is less than distance V(A)..V(S) */ |
| 1160 | if (dist < ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns)) { |
| 1161 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
| 1162 | for (i = 63, bsn = (ssn - 1) & mod_sns; |
| 1163 | i >= 0 && bsn != ((tbf->dir.dl.v_a - 1) & mod_sns); |
| 1164 | i--, bsn = (bsn - 1) & mod_sns) { |
| 1165 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1166 | if (bit) { |
| 1167 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1168 | "ack for BSN=%d\n", bsn); |
| 1169 | tbf->dir.dl.v_b[bsn & mod_sns_half] |
| 1170 | = 'A'; |
| 1171 | } else { |
| 1172 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1173 | "NACK for BSN=%d\n", bsn); |
| 1174 | tbf->dir.dl.v_b[bsn & mod_sns_half] |
| 1175 | = 'N'; |
| 1176 | } |
| 1177 | } |
| 1178 | } else { |
| 1179 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack range is out of " |
| 1180 | "V(A)..V(S) range\n"); |
| 1181 | } |
| 1182 | |
| 1183 | /* raise V(A), if possible */ |
| 1184 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1185 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1186 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] == 'A') { |
| 1187 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'I'; |
| 1188 | /* mark invalid */ |
| 1189 | tbf->dir.dl.v_a = (tbf->dir.dl.v_a + 1) |
| 1190 | & mod_sns; |
| 1191 | } else |
| 1192 | break; |
| 1193 | } |
| 1194 | |
| 1195 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 1196 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1197 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1198 | show_v_b[i] = tbf->dir.dl.v_b[bsn & mod_sns_half]; |
| 1199 | if (show_v_b[i] == 0) |
| 1200 | show_v_b[i] = ' '; |
| 1201 | } |
| 1202 | show_v_b[i] = '\0'; |
| 1203 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 1204 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 1205 | "X=Resend-Unacked\n", tbf->dir.dl.v_a, show_v_b, |
| 1206 | (tbf->dir.dl.v_s - 1) & mod_sns); |
| 1207 | |
| 1208 | return 0; |
| 1209 | } |
| 1210 | |
| 1211 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 1212 | |
| 1213 | /* check for LLC PDU in the LLC Queue */ |
| 1214 | msg = msgb_dequeue(&tbf->llc_queue); |
| 1215 | if (!msg) { |
| 1216 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 1217 | |
| 1218 | /* no message, start T3193, change state to RELEASE */ |
| 1219 | LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we " |
| 1220 | "release.\n"); |
| 1221 | /* use T3192 for T3193 */ |
| 1222 | if (bts->t3192_msec) |
| 1223 | tbf_timer_start(tbf, 3193, bts->t3192_msec / 1000, |
| 1224 | bts->t3192_msec & 1000); |
| 1225 | else |
| 1226 | tbf_timer_start(tbf, 3193, T3193); /* max T3192 */ |
| 1227 | tbf_new_state(tbf, GPRS_RLCMAC_WAIT_RELEASE); |
| 1228 | |
| 1229 | return 0; |
| 1230 | } |
| 1231 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1232 | tbf->llc_length = msg->len; |
| 1233 | msgb_free(msg); |
| 1234 | |
| 1235 | /* we have a message, so we trigger downlink assignment, and there |
| 1236 | * set the state to ASSIGN. also we set old_downlink, because we |
| 1237 | * re-use this tbf. */ |
| 1238 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, " |
| 1239 | "because another LLC PDU has arrived in between\n"); |
| 1240 | memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); /* reset RLC states */ |
| 1241 | gprs_rlcmac_trigger_downlink_assignment(tbf, 1); |
| 1242 | |
| 1243 | return 0; |
| 1244 | } |
| 1245 | |
| 1246 | |
| 1247 | struct msgb *gprs_rlcmac_send_packet_downlink_assignment( |
| 1248 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 1249 | { |
| 1250 | struct msgb *msg; |
| 1251 | struct gprs_rlcmac_tbf *new_tbf; |
| 1252 | |
| 1253 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 1254 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling is already " |
| 1255 | "sheduled for TBF=%d, so we must wait for downlink " |
| 1256 | "assignment...\n", tbf->tfi); |
| 1257 | return NULL; |
| 1258 | } |
| 1259 | |
| 1260 | /* on uplink TBF we get the downlink TBF to be assigned. */ |
| 1261 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 1262 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF); |
| 1263 | else |
| 1264 | new_tbf = tbf; |
| 1265 | if (!new_tbf) { |
| 1266 | LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink " |
| 1267 | "assignment at uplink TBF=%d, but there is no downlink " |
| 1268 | "TBF\n", tbf->tfi); |
| 1269 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1270 | return NULL; |
| 1271 | } |
| 1272 | |
| 1273 | msg = msgb_alloc(23, "rlcmac_dl_ass"); |
| 1274 | if (!msg) |
| 1275 | return NULL; |
| 1276 | bitvec *ass_vec = bitvec_alloc(23); |
| 1277 | if (!ass_vec) { |
| 1278 | msgb_free(msg); |
| 1279 | return NULL; |
| 1280 | } |
| 1281 | bitvec_unhex(ass_vec, |
| 1282 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 1283 | write_packet_downlink_assignment(ass_vec, tbf->tfi, |
| 1284 | (tbf->direction == GPRS_RLCMAC_DL_TBF), new_tbf->tfi, |
| 1285 | new_tbf->arfcn, new_tbf->ts, new_tbf->ta, new_tbf->tsc, |
| 1286 | POLLING_ASSIGNMENT); |
| 1287 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
| 1288 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t)); |
| 1289 | LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n"); |
| 1290 | decode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
| 1291 | LOGPC(DRLCMAC, LOGL_NOTICE, "\n"); |
| 1292 | LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Packet Downlink Assignment -------------------------\n"); |
| 1293 | bitvec_free(ass_vec); |
| 1294 | |
| 1295 | #if POLLING_ASSIGNMENT == 1 |
| 1296 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1297 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1298 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; |
| 1299 | #else |
| 1300 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1301 | #endif |
| 1302 | |
| 1303 | return msg; |
| 1304 | } |
| 1305 | |
| 1306 | static void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf, uint8_t poll) |
| 1307 | { |
| 1308 | LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u TLLI: 0x%08x Immidiate Assignment (CCCH)\n", tbf->tfi, tbf->tlli); |
| 1309 | bitvec *immediate_assignment = bitvec_alloc(23); |
| 1310 | bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 1311 | /* use request reference that has maximum distance to current time, |
| 1312 | * so the assignment will not conflict with possible RACH requests. */ |
| 1313 | int len = write_immediate_assignment(immediate_assignment, 1, 125, (tbf->pdch->last_rts_fn + 21216) % 2715648, tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi, 0, tbf->tlli, poll, tbf->poll_fn); |
| 1314 | pcu_l1if_tx_agch(immediate_assignment, len); |
| 1315 | bitvec_free(immediate_assignment); |
| 1316 | } |
| 1317 | |
| 1318 | /* depending on the current TBF, we assign on PACCH or AGCH */ |
| 1319 | void gprs_rlcmac_trigger_downlink_assignment(gprs_rlcmac_tbf *tbf, |
| 1320 | uint8_t old_downlink) |
| 1321 | { |
| 1322 | gprs_rlcmac_tbf *old_tbf; |
| 1323 | |
| 1324 | #ifdef DEBUG_DL_ASS_IDLE |
| 1325 | LOGP(DRLCMAC, LOGL_ERROR, "**** DEBUGGING DOWNLINK ASSIGNMENT ****\n"); |
| 1326 | #endif |
| 1327 | |
| 1328 | /* stop pending timer */ |
| 1329 | tbf_timer_stop(tbf); |
| 1330 | |
| 1331 | /* check for downlink tbf: */ |
| 1332 | if (old_downlink) |
| 1333 | old_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF); |
| 1334 | else |
| 1335 | old_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); |
| 1336 | if (old_tbf) { |
| 1337 | #ifdef DEBUG_DL_ASS_IDLE |
| 1338 | LOGP(DRLCMAC, LOGL_ERROR, "We must wait for current TBF to be " |
| 1339 | "released.\n"); |
| 1340 | /* wait one second until assignment */ |
| 1341 | tbf_timer_start(tbf, 1234, 1,0); |
| 1342 | #else |
| 1343 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on " |
| 1344 | "PACCH, because %slink TBF=%d exists for TLLI\n", |
| 1345 | (tbf->direction == GPRS_RLCMAC_DL_TBF) ? "down" : "up", |
| 1346 | old_tbf->tfi); |
| 1347 | old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
| 1348 | /* use TA from old TBF */ |
| 1349 | tbf->ta = old_tbf->ta; |
| 1350 | /* change state */ |
| 1351 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
| 1352 | /* start timer */ |
| 1353 | tbf_timer_start(tbf, 0, Tassign_pacch); |
| 1354 | #endif |
| 1355 | } else { |
| 1356 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on AGCH, " |
| 1357 | "because no uplink/downlink TBF exists for TLLI. " |
| 1358 | "(providing last timing advance)\n"); |
| 1359 | /* send immediate assignment */ |
| 1360 | gprs_rlcmac_downlink_assignment(tbf, 0); |
| 1361 | /* change state */ |
| 1362 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
| 1363 | /* start timer */ |
| 1364 | tbf_timer_start(tbf, 0, Tassign_agch); |
| 1365 | } |
| 1366 | } |
| 1367 | |