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) { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 76 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 77 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 78 | tbf->dir.ul.n3103++; |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 79 | if (tbf->dir.ul.n3103 == bts->n3103) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 80 | LOGP(DRLCMAC, LOGL_DEBUG, "- N3103 exceeded\n"); |
| 81 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 82 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 83 | return 0; |
| 84 | } |
| 85 | /* reschedule UL ack */ |
| 86 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 87 | } |
| 88 | } else |
| 89 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
| 90 | LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET " |
| 91 | "CONTROL ACK for PACKET UPLINK ASSIGNMENT.\n"); |
| 92 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 93 | } else |
| 94 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
| 95 | LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET " |
| 96 | "CONTROL ACK for PACKET DOWNLINK ASSIGNMENT.\n"); |
| 97 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 98 | /* in case out downlink assigment failed: */ |
| 99 | if (tbf->state == GPRS_RLCMAC_ASSIGN) { |
| 100 | LOGP(DRLCMAC, LOGL_DEBUG, "- Assignment failed\n"); |
| 101 | tbf_free(tbf); |
| 102 | } |
| 103 | } else |
| 104 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 105 | { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 106 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 107 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 108 | LOGP(DRLCMAC, LOGL_DEBUG, "- Timeout for polling PACKET " |
| 109 | " DOWNLINK ACK.\n"); |
| 110 | tbf->dir.dl.n3105++; |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 111 | if (tbf->dir.dl.n3105 == bts->n3105) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 112 | LOGP(DRLCMAC, LOGL_DEBUG, "- N3105 exceeded\n"); |
| 113 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 114 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 115 | return 0; |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | /* Received Uplink RLC control block. */ |
| 123 | int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint32_t fn) |
| 124 | { |
| 125 | uint8_t tfi = 0; |
| 126 | uint32_t tlli = 0; |
| 127 | struct gprs_rlcmac_tbf *tbf; |
| 128 | |
| 129 | RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)malloc(sizeof(RlcMacUplink_t)); |
| 130 | LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n"); |
| 131 | decode_gsm_rlcmac_uplink(rlc_block, ul_control_block); |
| 132 | LOGPC(DRLCMAC, LOGL_NOTICE, "\n"); |
| 133 | LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- RX : Uplink Control Block -------------------------\n"); |
| 134 | switch (ul_control_block->u.MESSAGE_TYPE) { |
| 135 | case MT_PACKET_CONTROL_ACK: |
| 136 | tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI; |
| 137 | tbf = tbf_by_poll_fn(fn); |
| 138 | if (!tbf) { |
| 139 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " |
| 140 | "unknown FN=%u TLL=0x%08x\n", fn, tlli); |
| 141 | break; |
| 142 | } |
| 143 | tfi = tbf->tfi; |
| 144 | if (tlli != tbf->tlli) { |
| 145 | LOGP(DRLCMAC, LOGL_NOTICE, "Phone changed TLLI to " |
| 146 | "0x%08x\n", tlli); |
| 147 | tbf->tlli = tlli; |
| 148 | } |
| 149 | LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Control Ack\n", tbf->tfi, tbf->tlli); |
| 150 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 151 | |
| 152 | /* check if this control ack belongs to packet uplink ack */ |
| 153 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
| 154 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| 155 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
| 156 | tbf_free(tbf); |
| 157 | break; |
| 158 | } |
| 159 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
| 160 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] DOWNLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| 161 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 162 | break; |
| 163 | } |
| 164 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
| 165 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] UPLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| 166 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 167 | break; |
| 168 | } |
| 169 | LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK " |
| 170 | "at no request\n"); |
| 171 | break; |
| 172 | case MT_PACKET_DOWNLINK_ACK_NACK: |
| 173 | tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI; |
| 174 | tbf = tbf_by_poll_fn(fn); |
| 175 | if (!tbf) { |
| 176 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
| 177 | "unknown FN=%u TFI=%d\n", fn, tfi); |
| 178 | break; |
| 179 | } |
| 180 | /* reset N3105 */ |
| 181 | tbf->dir.dl.n3105 = 0; |
| 182 | /* stop timer T3191 */ |
| 183 | tbf_timer_stop(tbf); |
| 184 | tlli = tbf->tlli; |
| 185 | LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli); |
| 186 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 187 | |
| 188 | gprs_rlcmac_downlink_ack(tbf, |
| 189 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.FINAL_ACK_INDICATION, |
| 190 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER, |
| 191 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP); |
| 192 | /* check for channel request */ |
| 193 | if (ul_control_block->u.Packet_Downlink_Ack_Nack.Exist_Channel_Request_Description) { |
| 194 | uint8_t trx, ts, usf; |
| 195 | struct gprs_rlcmac_tbf *ul_tbf; |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 196 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 197 | |
| 198 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack " |
| 199 | "message, so we provide one:\n"); |
| 200 | uplink_request: |
| 201 | /* create new tbf */ |
| 202 | tfi = tfi_alloc(&trx, &ts); |
| 203 | if (tfi < 0) { |
| 204 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 205 | /* FIXME: send reject */ |
| 206 | break; |
| 207 | } |
| 208 | usf = find_free_usf(trx, ts); |
| 209 | if (usf < 0) { |
| 210 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource for USF\n"); |
| 211 | /* FIXME: send reject */ |
| 212 | break; |
| 213 | } |
| 214 | ul_tbf = tbf_alloc(tfi, trx, ts); |
| 215 | ul_tbf->tlli = tbf->tlli; |
| 216 | ul_tbf->tlli_valid = 1; /* no content resolution */ |
| 217 | ul_tbf->ta = tbf->ta; /* use current TA */ |
| 218 | ul_tbf->direction = GPRS_RLCMAC_UL_TBF; |
| 219 | ul_tbf->dir.ul.usf = usf; |
| 220 | tbf_new_state(ul_tbf, GPRS_RLCMAC_FLOW); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 221 | tbf_timer_start(ul_tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 222 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] START TFI: %u\n", ul_tbf->tfi); |
| 223 | /* schedule uplink assignment */ |
| 224 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
| 225 | } |
| 226 | break; |
| 227 | case MT_PACKET_RESOURCE_REQUEST: |
| 228 | if (ul_control_block->u.Packet_Resource_Request.ID.UnionType) { |
| 229 | tlli = ul_control_block->u.Packet_Resource_Request.ID.u.TLLI; |
| 230 | tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); |
| 231 | if (!tbf) { |
| 232 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TLLI=0x%08x\n", tlli); |
| 233 | break; |
| 234 | } |
| 235 | tfi = tbf->tfi; |
| 236 | } else { |
| 237 | if (ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.UnionType) { |
| 238 | tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.DOWNLINK_TFI; |
| 239 | tbf = tbf_by_tfi(tfi, GPRS_RLCMAC_DL_TBF); |
| 240 | if (!tbf) { |
| 241 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown downlink TFI=%d\n", tlli); |
| 242 | break; |
| 243 | } |
| 244 | } else { |
| 245 | tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.UPLINK_TFI; |
| 246 | tbf = tbf_by_tfi(tfi, GPRS_RLCMAC_UL_TBF); |
| 247 | if (!tbf) { |
| 248 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TFI=%d\n", tlli); |
| 249 | break; |
| 250 | } |
| 251 | } |
| 252 | tlli = tbf->tlli; |
| 253 | } |
| 254 | LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet ressource request\n", tbf->tfi, tbf->tlli); |
| 255 | #warning FIXME |
| 256 | puts("FIXME: UL request during UL request"); exit(0); |
| 257 | |
| 258 | |
| 259 | break; |
| 260 | default: |
| 261 | LOGP(DRLCMAC, LOGL_ERROR, "RX: [PCU <- BTS] unknown control block received\n"); |
| 262 | } |
| 263 | free(ul_control_block); |
| 264 | return 1; |
| 265 | } |
| 266 | |
| 267 | |
| 268 | void tbf_timer_cb(void *_tbf) |
| 269 | { |
| 270 | struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf; |
| 271 | |
| 272 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF=%d timer %u expired.\n", tbf->tfi, |
| 273 | tbf->T); |
| 274 | |
| 275 | tbf->num_T_exp++; |
| 276 | |
| 277 | switch (tbf->T) { |
| 278 | #ifdef DEBUG_DL_ASS_IDLE |
| 279 | case 1234: |
| 280 | gprs_rlcmac_trigger_downlink_assignment(tbf, 0); |
| 281 | break; |
| 282 | #endif |
| 283 | case 0: /* assignment */ |
| 284 | /* change state to FLOW, so scheduler will start transmission */ |
| 285 | if (tbf->state == GPRS_RLCMAC_ASSIGN) |
| 286 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 287 | else |
| 288 | LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not in assign " |
| 289 | "state\n"); |
| 290 | break; |
| 291 | case 3169: |
| 292 | case 3191: |
| 293 | case 3193: |
| 294 | case 3195: |
| 295 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n"); |
| 296 | /* free TBF */ |
| 297 | tbf_free(tbf); |
| 298 | break; |
| 299 | default: |
| 300 | LOGP(DRLCMAC, LOGL_ERROR, "Timer expired in unknown mode: %u\n", |
| 301 | tbf->T); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | /* |
| 306 | * UL data block flow |
| 307 | */ |
| 308 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 309 | /* get TLLI from received UL data block */ |
| 310 | static int tlli_from_ul_data(uint8_t *data, uint8_t len, uint32_t *tlli) |
| 311 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 312 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 313 | struct rlc_li_field *li; |
| 314 | uint8_t e; |
| 315 | |
| 316 | if (!rh->ti) |
| 317 | return -EINVAL; |
| 318 | |
| 319 | data += 3; |
| 320 | len -= 3; |
| 321 | e = rh->e; |
| 322 | /* if E is not set (LI follows) */ |
| 323 | while (!e) { |
| 324 | if (!len) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 325 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA LI extended, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 326 | "but no more data\n"); |
| 327 | return -EINVAL; |
| 328 | } |
| 329 | /* get new E */ |
| 330 | li = (struct rlc_li_field *)data; |
| 331 | if (li->e == 0) /* if LI==0, E is interpreted as '1' */ |
| 332 | e = 1; |
| 333 | else |
| 334 | e = li->e; |
| 335 | data++; |
| 336 | len--; |
| 337 | } |
| 338 | if (len < 4) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 339 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of frame " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 340 | "border\n"); |
| 341 | return -EINVAL; |
| 342 | } |
| 343 | *tlli = ntohl(*((uint32_t *)data)); |
| 344 | |
| 345 | return 0; |
| 346 | } |
| 347 | |
| 348 | /* Store received block data in LLC message(s) and forward to SGSN if complete. |
| 349 | */ |
| 350 | static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data, |
| 351 | uint8_t len) |
| 352 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 353 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 354 | uint8_t e, m; |
| 355 | struct rlc_li_field *li; |
| 356 | uint8_t frame_offset[16], offset = 0, chunk; |
| 357 | int i, frames = 0; |
| 358 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 359 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 360 | |
| 361 | data += 3; |
| 362 | len -= 3; |
| 363 | e = rh->e; /* if extended */ |
| 364 | m = 1; /* more frames, that means: the first frame */ |
| 365 | |
| 366 | /* Parse frame offsets from length indicator(s), if any. */ |
| 367 | while (1) { |
| 368 | if (frames == (int)sizeof(frame_offset)) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 369 | LOGP(DRLCMACUL, LOGL_ERROR, "Too many frames in " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 370 | "block\n"); |
| 371 | return -EINVAL; |
| 372 | } |
| 373 | frame_offset[frames++] = offset; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 374 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 375 | "%d\n", frames, offset); |
| 376 | if (!len) |
| 377 | break; |
| 378 | /* M == 0 and E == 0 is not allowed in this version. */ |
| 379 | if (!m && !e) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 380 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TFI=%d " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 381 | "ignored, because M='0' and E='0'.\n", |
| 382 | tbf->tfi); |
| 383 | return 0; |
| 384 | } |
| 385 | /* no more frames in this segment */ |
| 386 | if (e) { |
| 387 | break; |
| 388 | } |
| 389 | /* There is a new frame and an LI that delimits it. */ |
| 390 | if (m) { |
| 391 | li = (struct rlc_li_field *)data; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 392 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n", |
| 393 | li->li); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 394 | /* Special case: LI == 0 |
| 395 | * If the last segment would fit precisely into the |
| 396 | * rest of the RLC MAC block, there would be no way |
| 397 | * to delimit that this segment ends and is not |
| 398 | * continued in the next block. |
| 399 | * The special LI (0) is used to force the segment to |
| 400 | * extend into the next block, so it is delimited there. |
| 401 | * This LI must be skipped. Also it is the last LI. |
| 402 | */ |
| 403 | if (li->li == 0) { |
| 404 | data++; |
| 405 | len--; |
| 406 | m = 1; /* M is ignored, we know there is more */ |
| 407 | break; /* handle E as '1', so we break! */ |
| 408 | } |
| 409 | e = li->e; |
| 410 | m = li->m; |
| 411 | offset += li->li; |
| 412 | data++; |
| 413 | len--; |
| 414 | continue; |
| 415 | } |
| 416 | } |
| 417 | if (!m) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 418 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 419 | "data\n"); |
| 420 | } |
| 421 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 422 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 423 | len); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 424 | /* TLLI */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 425 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 426 | if (len < 4) { |
| 427 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of " |
| 428 | "frame border\n"); |
| 429 | return -EINVAL; |
| 430 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 431 | data += 4; |
| 432 | len -= 4; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 433 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: " |
| 434 | "%d\n", len); |
| 435 | } |
| 436 | |
| 437 | /* PFI */ |
| 438 | if (rh->pi) { |
| 439 | LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, " |
| 440 | "please disable in SYSTEM INFORMATION\n"); |
| 441 | if (len < 1) { |
| 442 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA PFI out of " |
| 443 | "frame border\n"); |
| 444 | return -EINVAL; |
| 445 | } |
| 446 | data++; |
| 447 | len--; |
| 448 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 449 | "%d\n", len); |
| 450 | } |
| 451 | |
| 452 | /* Now we have: |
| 453 | * - a list of frames offsets: frame_offset[] |
| 454 | * - number of frames: i |
| 455 | * - m == 0: Last frame carries spare data (end of TBF). |
| 456 | */ |
| 457 | |
| 458 | /* Check if last offset would exceed frame. */ |
| 459 | if (offset > len) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 460 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TFI=%d ignored, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 461 | "because LI exceeds frame length.\n", tbf->tfi); |
| 462 | return -EINVAL; |
| 463 | } |
| 464 | |
| 465 | /* create LLC frames */ |
| 466 | for (i = 0; i < frames; i++) { |
| 467 | /* last frame ? */ |
| 468 | if (i == frames - 1) { |
| 469 | /* no more data in last frame */ |
| 470 | if (!m) |
| 471 | break; |
| 472 | /* data until end of frame */ |
| 473 | chunk = len - frame_offset[i]; |
| 474 | } else { |
| 475 | /* data until next frame */ |
| 476 | chunk = frame_offset[i + 1] - frame_offset[i]; |
| 477 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 478 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 479 | "frame at %d.\n", chunk, tbf->llc_index); |
| 480 | if (tbf->llc_index + chunk > LLC_MAX_LEN) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 481 | LOGP(DRLCMACUL, LOGL_NOTICE, "LLC frame exceeds " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 482 | "maximum size.\n"); |
| 483 | chunk = LLC_MAX_LEN - tbf->llc_index; |
| 484 | } |
| 485 | memcpy(tbf->llc_frame + tbf->llc_index, data + frame_offset[i], |
| 486 | chunk); |
| 487 | tbf->llc_index += chunk; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 488 | /* not last frame. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 489 | if (i != frames - 1) { |
| 490 | /* send frame to SGSN */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 491 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 492 | "TFI=%d: %s\n", tbf->tfi, |
| 493 | osmo_hexdump(tbf->llc_frame, tbf->llc_index)); |
| 494 | gprs_rlcmac_tx_ul_ud(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 495 | tbf->llc_index = 0; /* reset frame space */ |
| 496 | /* also check if CV==0, because the frame may fill up the |
| 497 | * block precisely, then it is also complete. normally the |
| 498 | * frame would be extended into the next block with a 0-length |
| 499 | * delimiter added to this block. */ |
| 500 | } else if (rh->cv == 0) { |
| 501 | /* send frame to SGSN */ |
| 502 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
| 503 | "TFI=%d that fits precisely in last block: " |
| 504 | "%s\n", tbf->tfi, |
| 505 | osmo_hexdump(tbf->llc_frame, tbf->llc_index)); |
| 506 | gprs_rlcmac_tx_ul_ud(tbf); |
| 507 | tbf->llc_index = 0; /* reset frame space */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 508 | } |
| 509 | } |
| 510 | |
| 511 | return 0; |
| 512 | } |
| 513 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 514 | struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_tbf *tbf, |
| 515 | uint32_t fn) |
| 516 | { |
| 517 | int final = (tbf->state == GPRS_RLCMAC_FINISHED); |
| 518 | struct msgb *msg; |
| 519 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 520 | if (final && tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 521 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 522 | "sheduled for TBF=%d, so we must wait for final uplink " |
| 523 | "ack...\n", tbf->tfi); |
| 524 | return NULL; |
| 525 | } |
| 526 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 527 | msg = msgb_alloc(23, "rlcmac_ul_ack"); |
| 528 | if (!msg) |
| 529 | return NULL; |
| 530 | bitvec *ack_vec = bitvec_alloc(23); |
| 531 | if (!ack_vec) { |
| 532 | msgb_free(msg); |
| 533 | return NULL; |
| 534 | } |
| 535 | bitvec_unhex(ack_vec, |
| 536 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 537 | write_packet_uplink_ack(ack_vec, tbf, final); |
| 538 | bitvec_pack(ack_vec, msgb_put(msg, 23)); |
| 539 | bitvec_free(ack_vec); |
| 540 | |
| 541 | if (final) { |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 542 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 543 | tbf->poll_fn = (fn + 13) % 2715648; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 544 | /* waiting for final acknowledge */ |
| 545 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 546 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 547 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 548 | |
| 549 | return msg; |
| 550 | } |
| 551 | |
| 552 | /* receive UL data block |
| 553 | * |
| 554 | * The blocks are defragmented and forwarded as LLC frames, if complete. |
| 555 | */ |
| 556 | int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t *data, uint8_t len) |
| 557 | { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 558 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 559 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 560 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 561 | uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index; |
| 562 | int rc; |
| 563 | |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 564 | switch (len) { |
| 565 | case 54: |
| 566 | /* omitting spare bits */ |
| 567 | len = 53; |
| 568 | break; |
| 569 | case 40: |
| 570 | /* omitting spare bits */ |
| 571 | len = 39; |
| 572 | break; |
| 573 | case 34: |
| 574 | /* omitting spare bits */ |
| 575 | len = 33; |
| 576 | break; |
| 577 | case 23: |
| 578 | break; |
| 579 | default: |
| 580 | LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid" |
| 581 | "length: %d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 582 | return -EINVAL; |
| 583 | } |
| 584 | |
| 585 | /* find TBF inst from given TFI */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 586 | tbf = tbf_by_tfi(rh->tfi, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 587 | if (!tbf) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 588 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TFI=%d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 589 | rh->tfi); |
| 590 | return 0; |
| 591 | } |
| 592 | |
| 593 | if (tbf->direction != GPRS_RLCMAC_UL_TBF) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 594 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TFI=%d not Uplink " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 595 | "tbf\n", rh->tfi); |
| 596 | return 0; |
| 597 | } |
| 598 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 599 | LOGP(DRLCMACUL, LOGL_INFO, "UL DATA TFI=%d received (V(Q)=%d .. " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 600 | "V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r); |
| 601 | |
| 602 | /* get TLLI */ |
| 603 | if (!tbf->tlli_valid) { |
| 604 | /* no TLLI yet */ |
| 605 | if (!rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 606 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TFI=%d without " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 607 | "TLLI, but no TLLI received yet\n", rh->tfi); |
| 608 | return 0; |
| 609 | } |
| 610 | rc = tlli_from_ul_data(data, len, &tbf->tlli); |
| 611 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 612 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 613 | "of UL DATA TFI=%d.\n", rh->tfi); |
| 614 | return 0; |
| 615 | } |
| 616 | tbf->tlli_valid = 1; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 617 | LOGP(DRLCMACUL, LOGL_DEBUG, " Decoded premier TLLI=0x%08x of " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 618 | "UL DATA TFI=%d.\n", tbf->tlli, rh->tfi); |
| 619 | /* already have TLLI, but we stille get another one */ |
| 620 | } else if (rh->ti) { |
| 621 | uint32_t tlli; |
| 622 | rc = tlli_from_ul_data(data, len, &tlli); |
| 623 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 624 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 625 | "of UL DATA TFI=%d.\n", rh->tfi); |
| 626 | return 0; |
| 627 | } |
| 628 | if (tlli != tbf->tlli) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 629 | LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 630 | "DATA TFI=%d. (Ignoring due to contention " |
| 631 | "resolution)\n", rh->tfi); |
| 632 | return 0; |
| 633 | } |
| 634 | } |
| 635 | |
| 636 | mod_sns = tbf->sns - 1; |
| 637 | mod_sns_half = (tbf->sns >> 1) - 1; |
| 638 | |
| 639 | /* restart T3169 */ |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 640 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 641 | |
| 642 | /* Increment RX-counter */ |
| 643 | tbf->dir.ul.rx_counter++; |
| 644 | |
| 645 | /* current block relative to lowest unreceived block */ |
| 646 | offset_v_q = (rh->bsn - tbf->dir.ul.v_q) & mod_sns; |
| 647 | /* If out of window (may happen if blocks below V(Q) are received |
| 648 | * again. */ |
| 649 | if (offset_v_q >= tbf->ws) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 650 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 651 | "%d..%d (it's normal)\n", rh->bsn, tbf->dir.ul.v_q, |
| 652 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 653 | return 0; |
| 654 | } |
| 655 | /* Write block to buffer and set receive state array. */ |
| 656 | index = rh->bsn & mod_sns_half; /* memory index of block */ |
| 657 | memcpy(tbf->rlc_block[index], data, len); /* Copy block. */ |
| 658 | tbf->rlc_block_len[index] = len; |
| 659 | tbf->dir.ul.v_n[index] = 'R'; /* Mark received block. */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 660 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 661 | rh->bsn, tbf->dir.ul.v_q, |
| 662 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 663 | /* Raise V(R) to highest received sequence number not received. */ |
| 664 | offset_v_r = (rh->bsn + 1 - tbf->dir.ul.v_r) & mod_sns; |
| 665 | if (offset_v_r < (tbf->sns >> 1)) { /* Positive offset, so raise. */ |
| 666 | while (offset_v_r--) { |
| 667 | if (offset_v_r) /* all except the received block */ |
| 668 | tbf->dir.ul.v_n[tbf->dir.ul.v_r & mod_sns_half] |
| 669 | = 'N'; /* Mark block as not received */ |
| 670 | tbf->dir.ul.v_r = (tbf->dir.ul.v_r + 1) & mod_sns; |
| 671 | /* Inc V(R). */ |
| 672 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 673 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 674 | tbf->dir.ul.v_r); |
| 675 | } |
| 676 | |
| 677 | /* Raise V(Q) if possible, and retrieve LLC frames from blocks. |
| 678 | * This is looped until there is a gap (non received block) or |
| 679 | * the window is empty.*/ |
| 680 | while (tbf->dir.ul.v_q != tbf->dir.ul.v_r && tbf->dir.ul.v_n[ |
| 681 | (index = tbf->dir.ul.v_q & mod_sns_half)] == 'R') { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 682 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 683 | "V(Q) to %d\n", tbf->dir.ul.v_q, |
| 684 | (tbf->dir.ul.v_q + 1) & mod_sns); |
| 685 | /* get LLC data from block */ |
| 686 | gprs_rlcmac_assemble_llc(tbf, tbf->rlc_block[index], |
| 687 | tbf->rlc_block_len[index]); |
| 688 | /* raise V(Q), because block already received */ |
| 689 | tbf->dir.ul.v_q = (tbf->dir.ul.v_q + 1) & mod_sns; |
| 690 | } |
| 691 | |
| 692 | /* Check CV of last frame in buffer */ |
| 693 | if (tbf->state == GPRS_RLCMAC_FLOW /* still in flow state */ |
| 694 | && tbf->dir.ul.v_q == tbf->dir.ul.v_r) { /* if complete */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 695 | struct rlc_ul_header *last_rh = (struct rlc_ul_header *) |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 696 | tbf->rlc_block[(tbf->dir.ul.v_r - 1) & mod_sns_half]; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 697 | LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 698 | "last block: BSN=%d CV=%d\n", last_rh->bsn, |
| 699 | last_rh->cv); |
| 700 | if (last_rh->cv == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 701 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 702 | "TBF\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 703 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 704 | /* Reset N3103 counter. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 705 | tbf->dir.ul.n3103 = 0; |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | /* If TLLI is included or if we received half of the window, we send |
| 710 | * an ack/nack */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 711 | if (rh->si || rh->ti || tbf->state == GPRS_RLCMAC_FINISHED |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 712 | || (tbf->dir.ul.rx_counter % ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 713 | if (rh->si) { |
| 714 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
| 715 | "because MS is stalled.\n"); |
| 716 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 717 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 718 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 719 | "because TLLI is included.\n"); |
| 720 | } |
| 721 | if (tbf->state == GPRS_RLCMAC_FINISHED) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 722 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 723 | "because last block has CV==0.\n"); |
| 724 | } |
| 725 | if ((tbf->dir.ul.rx_counter % ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 726 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 727 | "because %d frames received.\n", |
| 728 | ACK_AFTER_FRAMES); |
| 729 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 730 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) { |
| 731 | /* trigger sending at next RTS */ |
| 732 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 733 | } else { |
| 734 | /* already triggered */ |
| 735 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Sending Ack/Nack is " |
| 736 | "already triggered, don't schedule!\n"); |
| 737 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 738 | } |
| 739 | |
| 740 | return 0; |
| 741 | } |
| 742 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 743 | struct msgb *gprs_rlcmac_send_packet_uplink_assignment( |
| 744 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 745 | { |
| 746 | struct msgb *msg; |
| 747 | struct gprs_rlcmac_tbf *new_tbf; |
| 748 | |
| 749 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 750 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 751 | "sheduled for TBF=%d, so we must wait for uplink " |
| 752 | "assignment...\n", tbf->tfi); |
| 753 | return NULL; |
| 754 | } |
| 755 | |
| 756 | /* on down TBF we get the uplink TBF to be assigned. */ |
| 757 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 758 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); |
| 759 | else |
| 760 | new_tbf = tbf; |
| 761 | |
| 762 | if (!new_tbf) { |
| 763 | LOGP(DRLCMACUL, LOGL_ERROR, "We have a schedule for uplink " |
| 764 | "assignment at downlink TBF=%d, but there is no uplink " |
| 765 | "TBF\n", tbf->tfi); |
| 766 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 767 | return NULL; |
| 768 | } |
| 769 | |
| 770 | msg = msgb_alloc(23, "rlcmac_ul_ass"); |
| 771 | if (!msg) |
| 772 | return NULL; |
| 773 | bitvec *ass_vec = bitvec_alloc(23); |
| 774 | if (!ass_vec) { |
| 775 | msgb_free(msg); |
| 776 | return NULL; |
| 777 | } |
| 778 | bitvec_unhex(ass_vec, |
| 779 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 780 | write_packet_uplink_assignment(ass_vec, tbf->tfi, |
| 781 | (tbf->direction == GPRS_RLCMAC_DL_TBF), 0, 0, new_tbf->tfi, |
| 782 | new_tbf->dir.ul.usf, new_tbf->arfcn, new_tbf->ts, new_tbf->ta, |
| 783 | new_tbf->tsc, POLLING_ASSIGNMENT); |
| 784 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
| 785 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t)); |
| 786 | LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ TX : Packet Uplink Assignment +++++++++++++++++++++++++\n"); |
| 787 | decode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
| 788 | LOGPC(DRLCMAC, LOGL_NOTICE, "\n"); |
| 789 | LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Packet Uplink Assignment -------------------------\n"); |
| 790 | bitvec_free(ass_vec); |
| 791 | |
| 792 | #if POLLING_ASSIGNMENT == 1 |
| 793 | FIXME process does not work, also the acknowledgement is not checked. |
| 794 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 795 | tbf->poll_fn = (fn + 13) % 2715648; |
| 796 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK; |
| 797 | #else |
| 798 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 799 | #endif |
| 800 | |
| 801 | return msg; |
| 802 | } |
| 803 | |
| 804 | int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta) |
| 805 | { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 806 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 807 | struct gprs_rlcmac_tbf *tbf; |
| 808 | uint8_t trx, ts; |
| 809 | int tfi, usf; /* must be signed */ |
| 810 | |
| 811 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide " |
| 812 | "one:\n"); |
| 813 | // Create new TBF |
| 814 | tfi = tfi_alloc(&trx, &ts); |
| 815 | if (tfi < 0) { |
| 816 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 817 | /* FIXME: send reject */ |
| 818 | return -EBUSY; |
| 819 | } |
| 820 | usf = find_free_usf(trx, ts); |
| 821 | if (usf < 0) { |
| 822 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource for USF\n"); |
| 823 | /* FIXME: send reject */ |
| 824 | return -EBUSY; |
| 825 | } |
| 826 | tbf = tbf_alloc(tfi, trx, ts); |
| 827 | if (qta < 0) |
| 828 | qta = 0; |
| 829 | if (qta > 252) |
| 830 | qta = 252; |
| 831 | tbf->ta = qta >> 2; |
| 832 | tbf->direction = GPRS_RLCMAC_UL_TBF; |
| 833 | tbf->dir.ul.usf = usf; |
| 834 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 835 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 836 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] START TFI: %u\n", tbf->tfi); |
| 837 | 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); |
| 838 | LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u Packet Immidiate Assignment\n", tbf->tfi); |
| 839 | bitvec *immediate_assignment = bitvec_alloc(23); |
| 840 | bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 841 | int len = write_immediate_assignment(immediate_assignment, 0, ra, Fn, tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi, usf, 0, 0, 0); |
| 842 | pcu_l1if_tx_agch(immediate_assignment, len); |
| 843 | bitvec_free(immediate_assignment); |
| 844 | |
| 845 | return 0; |
| 846 | } |
| 847 | |
| 848 | |
| 849 | /* |
| 850 | * DL data block flow |
| 851 | */ |
| 852 | |
| 853 | /* send DL data block |
| 854 | * |
| 855 | * The messages are fragmented and forwarded as data blocks. |
| 856 | */ |
| 857 | struct msgb *gprs_rlcmac_send_data_block_acknowledged( |
| 858 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 859 | { |
| 860 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 861 | struct rlc_dl_header *rh; |
| 862 | struct rlc_li_field *li; |
| 863 | uint8_t block_length; /* total length of block, including spare bits */ |
| 864 | uint8_t block_data; /* usable data of block, w/o spare bits, inc. MAC */ |
| 865 | struct msgb *msg, *dl_msg; |
| 866 | uint8_t bsn; |
| 867 | uint16_t mod_sns = tbf->sns - 1; |
| 868 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 869 | uint16_t index; |
| 870 | uint8_t *delimiter, *data, *e_pointer; |
| 871 | uint8_t len; |
| 872 | uint16_t space, chunk; |
| 873 | |
| 874 | LOGP(DRLCMACDL, LOGL_INFO, "DL DATA TFI=%d downlink (V(A)==%d .. " |
| 875 | "V(S)==%d)\n", tbf->tfi, tbf->dir.dl.v_a, tbf->dir.dl.v_s); |
| 876 | |
| 877 | do_resend: |
| 878 | /* check if there is a block with negative acknowledgement */ |
| 879 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 880 | bsn = (bsn + 1) & mod_sns) { |
| 881 | index = (bsn & mod_sns_half); |
| 882 | if (tbf->dir.dl.v_b[index] == 'N' |
| 883 | || tbf->dir.dl.v_b[index] == 'X') { |
| 884 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", |
| 885 | bsn); |
| 886 | /* re-send block with negative aknowlegement */ |
| 887 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 888 | goto tx_block; |
| 889 | } |
| 890 | } |
| 891 | |
| 892 | /* if the window has stalled, or transfer is complete, |
| 893 | * send an unacknowledged block */ |
| 894 | if (tbf->state == GPRS_RLCMAC_FINISHED |
| 895 | || ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns) == tbf->ws) { |
| 896 | int resend = 0; |
| 897 | |
| 898 | if (tbf->state == GPRS_RLCMAC_FINISHED) |
| 899 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 900 | "because all blocks have been transmitted.\n", |
| 901 | tbf->dir.dl.v_a); |
| 902 | else |
| 903 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 904 | "because all window is stalled.\n", |
| 905 | tbf->dir.dl.v_a); |
| 906 | /* If V(S) == V(A) and finished state, we would have received |
| 907 | * acknowledgement of all transmitted block. In this case we |
| 908 | * would have transmitted the final block, and received ack |
| 909 | * from MS. But in this case we did not receive the final ack |
| 910 | * indication from MS. This should never happen if MS works |
| 911 | * correctly. */ |
| 912 | if (tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
| 913 | LOGP(DRLCMACDL, LOGL_ERROR, "- MS acked all block " |
| 914 | "(including final block), but did not include " |
| 915 | "FINAL_ACK_INDICATION!\n"); |
| 916 | /* we just send final block again */ |
| 917 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 918 | goto tx_block; |
| 919 | } |
| 920 | |
| 921 | /* cycle through all unacked blocks */ |
| 922 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 923 | bsn = (bsn + 1) & mod_sns) { |
| 924 | index = (bsn & mod_sns_half); |
| 925 | if (tbf->dir.dl.v_b[index] == 'U') { |
| 926 | /* mark to be re-send */ |
| 927 | tbf->dir.dl.v_b[index] = 'X'; |
| 928 | resend++; |
| 929 | } |
| 930 | } |
| 931 | /* At this point there should be at leasst one unacked block |
| 932 | * to be resent. If not, this is an software error. */ |
| 933 | if (resend == 0) { |
| 934 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 935 | "There are no unacknowledged blocks, but V(A) " |
| 936 | " != V(S). PLEASE FIX!\n"); |
| 937 | /* we just send final block again */ |
| 938 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 939 | goto tx_block; |
| 940 | } |
| 941 | goto do_resend; |
| 942 | } |
| 943 | |
| 944 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n", |
| 945 | tbf->dir.dl.v_s); |
| 946 | |
| 947 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 948 | index = tbf->dir.dl.v_s & mod_sns_half; |
| 949 | data = tbf->rlc_block[index]; |
Andreas Eversberg | b3c6f6c | 2012-07-06 07:40:08 +0200 | [diff] [blame] | 950 | switch (bts->initial_cs) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 951 | case 2: /* CS-2 */ |
| 952 | block_length = 34; |
| 953 | block_data = 33; |
| 954 | break; |
| 955 | case 3: /* CS-3 */ |
| 956 | block_length = 40; |
| 957 | block_data = 39; |
| 958 | break; |
| 959 | case 4: /* CS-4 */ |
| 960 | block_length = 54; |
| 961 | block_data = 53; |
| 962 | break; |
| 963 | default: /* CS-1 */ |
| 964 | block_length = 23; |
| 965 | block_data = 23; |
| 966 | } |
| 967 | memset(data, 0x2b, block_data); /* spare bits will be left 0 */ |
| 968 | rh = (struct rlc_dl_header *)data; |
| 969 | rh->pt = 0; /* Data Block */ |
| 970 | rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */ |
| 971 | rh->usf = 7; /* will be set at scheduler */ |
| 972 | rh->pr = 0; /* FIXME: power reduction */ |
| 973 | rh->tfi = tbf->tfi; /* TFI */ |
| 974 | rh->fbi = 0; /* Final Block Indicator, set late, if true */ |
| 975 | rh->bsn = tbf->dir.dl.v_s; /* Block Sequence Number */ |
| 976 | rh->e = 0; /* Extension bit, maybe set later */ |
| 977 | e_pointer = data + 2; /* points to E of current chunk */ |
| 978 | data += 3; |
| 979 | delimiter = data; /* where next length header would be stored */ |
| 980 | space = block_data - 3; |
| 981 | while (1) { |
| 982 | chunk = tbf->llc_length - tbf->llc_index; |
| 983 | /* if chunk will exceed block limit */ |
| 984 | if (chunk > space) { |
| 985 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 986 | "larger than space (%d) left in block: copy " |
| 987 | "only remaining space, and we are done\n", |
| 988 | chunk, space); |
| 989 | /* block is filled, so there is no extension */ |
| 990 | *e_pointer |= 0x01; |
| 991 | /* fill only space */ |
| 992 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 993 | /* incement index */ |
| 994 | tbf->llc_index += space; |
| 995 | /* return data block as message */ |
| 996 | break; |
| 997 | } |
| 998 | /* if FINAL chunk would fit precisely in space left */ |
| 999 | if (chunk == space && llist_empty(&tbf->llc_queue)) { |
| 1000 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1001 | "would exactly fit into space (%d): because " |
| 1002 | "this is a final block, we don't add length " |
| 1003 | "header, and we are done\n", chunk, space); |
| 1004 | /* block is filled, so there is no extension */ |
| 1005 | *e_pointer |= 0x01; |
| 1006 | /* fill space */ |
| 1007 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1008 | /* reset LLC frame */ |
| 1009 | tbf->llc_index = tbf->llc_length = 0; |
| 1010 | /* final block */ |
| 1011 | rh->fbi = 1; /* we indicate final block */ |
| 1012 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1013 | /* return data block as message */ |
| 1014 | break; |
| 1015 | } |
| 1016 | /* if chunk would fit exactly in space left */ |
| 1017 | if (chunk == space) { |
| 1018 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1019 | "would exactly fit into space (%d): add length " |
| 1020 | "header with LI=0, to make frame extend to " |
| 1021 | "next block, and we are done\n", chunk, space); |
| 1022 | /* make space for delimiter */ |
| 1023 | if (delimiter != data) |
| 1024 | memcpy(delimiter + 1, delimiter, |
| 1025 | data - delimiter); |
| 1026 | data++; |
| 1027 | space--; |
| 1028 | /* add LI with 0 length */ |
| 1029 | li = (struct rlc_li_field *)delimiter; |
| 1030 | li->e = 1; /* not more extension */ |
| 1031 | li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| 1032 | li->li = 0; /* chunk fills the complete space */ |
| 1033 | // no need to set e_pointer nor increase delimiter |
| 1034 | /* fill only space, which is 1 octet less than chunk */ |
| 1035 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1036 | /* incement index */ |
| 1037 | tbf->llc_index += space; |
| 1038 | /* return data block as message */ |
| 1039 | break; |
| 1040 | } |
| 1041 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 1042 | "than remaining space (%d): add length header to " |
| 1043 | "to delimit LLC frame\n", chunk, space); |
| 1044 | /* the LLC frame chunk ends in this block */ |
| 1045 | /* make space for delimiter */ |
| 1046 | if (delimiter != data) |
| 1047 | memcpy(delimiter + 1, delimiter, data - delimiter); |
| 1048 | data++; |
| 1049 | space--; |
| 1050 | /* add LI to delimit frame */ |
| 1051 | li = (struct rlc_li_field *)delimiter; |
| 1052 | li->e = 0; /* Extension bit, maybe set later */ |
| 1053 | li->m = 0; /* will be set later, if there is more LLC data */ |
| 1054 | li->li = chunk; /* length of chunk */ |
| 1055 | e_pointer = delimiter; /* points to E of current delimiter */ |
| 1056 | delimiter++; |
| 1057 | /* copy (rest of) LLC frame to space */ |
| 1058 | memcpy(data, tbf->llc_frame + tbf->llc_index, chunk); |
| 1059 | data += chunk; |
| 1060 | space -= chunk; |
| 1061 | /* reset LLC frame */ |
| 1062 | tbf->llc_index = tbf->llc_length = 0; |
| 1063 | /* dequeue next LLC frame, if any */ |
| 1064 | msg = msgb_dequeue(&tbf->llc_queue); |
| 1065 | if (msg) { |
| 1066 | LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC " |
| 1067 | "(len=%d)\n", msg->len); |
| 1068 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1069 | tbf->llc_length = msg->len; |
| 1070 | msgb_free(msg); |
| 1071 | } |
| 1072 | /* if we have more data and we have space left */ |
| 1073 | if (space > 0 && tbf->llc_length) { |
| 1074 | li->m = 1; /* we indicate more frames to follow */ |
| 1075 | continue; |
| 1076 | } |
| 1077 | /* if we don't have more LLC frames */ |
| 1078 | if (!tbf->llc_length) { |
| 1079 | LOGP(DRLCMACDL, LOGL_INFO, "-- Final block, so we " |
| 1080 | "done.\n"); |
| 1081 | li->e = 1; /* we cannot extend */ |
| 1082 | rh->fbi = 1; /* we indicate final block */ |
| 1083 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1084 | break; |
| 1085 | } |
| 1086 | /* we have no space left */ |
| 1087 | LOGP(DRLCMACDL, LOGL_INFO, "-- No space left, so we are " |
| 1088 | "done.\n"); |
| 1089 | li->e = 1; /* we cannot extend */ |
| 1090 | break; |
| 1091 | } |
| 1092 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n", |
| 1093 | osmo_hexdump(tbf->rlc_block[index], block_length)); |
| 1094 | tbf->rlc_block_len[index] = block_length; |
| 1095 | /* raise send state and set ack state array */ |
| 1096 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 1097 | tbf->dir.dl.v_s = (tbf->dir.dl.v_s + 1) & mod_sns; /* inc send state */ |
| 1098 | |
| 1099 | tx_block: |
| 1100 | /* from this point on, new block is sent or old block is resent */ |
| 1101 | |
| 1102 | /* get data and header from current block */ |
| 1103 | data = tbf->rlc_block[index]; |
| 1104 | len = tbf->rlc_block_len[index]; |
| 1105 | rh = (struct rlc_dl_header *)data; |
| 1106 | |
| 1107 | /* Increment TX-counter */ |
| 1108 | tbf->dir.dl.tx_counter++; |
| 1109 | |
| 1110 | /* Clear Polling, if still set in history buffer */ |
| 1111 | rh->s_p = 0; |
| 1112 | |
| 1113 | /* poll after ACK_AFTER_FRAMES frames, or when final block is tx. */ |
| 1114 | if (rh->fbi == 1 || (tbf->dir.dl.tx_counter % ACK_AFTER_FRAMES) == 0) { |
| 1115 | if (rh->fbi == 1) { |
| 1116 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 1117 | "polling, because final block sent.\n"); |
| 1118 | } |
| 1119 | if ((tbf->dir.dl.tx_counter % ACK_AFTER_FRAMES) == 0) { |
| 1120 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 1121 | "polling, because %d blocks sent.\n", |
| 1122 | ACK_AFTER_FRAMES); |
| 1123 | } |
| 1124 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) |
| 1125 | LOGP(DRLCMACDL, LOGL_NOTICE, "Polling is already " |
| 1126 | "sheduled for TBF=%d, so we must wait for " |
| 1127 | "requesting downlink ack\n", tbf->tfi); |
| 1128 | else { |
| 1129 | /* start timer whenever we send the final block */ |
| 1130 | if (rh->fbi == 1) |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 1131 | tbf_timer_start(tbf, 3191, bts->t3191, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1132 | |
| 1133 | /* schedule polling */ |
| 1134 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1135 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1136 | |
| 1137 | /* set polling in header */ |
| 1138 | rh->rrbp = 0; /* N+13 */ |
| 1139 | rh->s_p = 1; /* Polling */ |
| 1140 | } |
| 1141 | } |
| 1142 | |
| 1143 | /* return data block as message */ |
| 1144 | dl_msg = msgb_alloc(len, "rlcmac_dl_data"); |
| 1145 | if (!dl_msg) |
| 1146 | return NULL; |
| 1147 | memcpy(msgb_put(dl_msg, len), data, len); |
| 1148 | |
| 1149 | return dl_msg; |
| 1150 | } |
| 1151 | |
| 1152 | int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final, |
| 1153 | uint8_t ssn, uint8_t *rbb) |
| 1154 | { |
| 1155 | char show_rbb[65], show_v_b[RLC_MAX_SNS + 1]; |
| 1156 | uint16_t mod_sns = tbf->sns - 1; |
| 1157 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 1158 | int i; /* must be signed */ |
| 1159 | int16_t dist; /* must be signed */ |
| 1160 | uint8_t bit; |
| 1161 | uint16_t bsn; |
| 1162 | struct msgb *msg; |
| 1163 | |
| 1164 | LOGP(DRLCMACDL, LOGL_INFO, "TFI=%d downlink acknowledge\n", |
| 1165 | tbf->tfi); |
| 1166 | |
| 1167 | if (!final) { |
| 1168 | /* show received array in debug (bit 64..1) */ |
| 1169 | for (i = 63; i >= 0; i--) { |
| 1170 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1171 | show_rbb[i] = (bit) ? '1' : 'o'; |
| 1172 | } |
| 1173 | show_rbb[64] = '\0'; |
| 1174 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
| 1175 | "(BSN=%d) 1=ACK o=NACK\n", ssn - 64, show_rbb, |
| 1176 | ssn - 1); |
| 1177 | |
| 1178 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 1179 | /* calculate distance of ssn from V(S) */ |
| 1180 | dist = (tbf->dir.dl.v_s - ssn) & mod_sns; |
| 1181 | /* check if distance is less than distance V(A)..V(S) */ |
| 1182 | if (dist < ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns)) { |
| 1183 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
| 1184 | for (i = 63, bsn = (ssn - 1) & mod_sns; |
| 1185 | i >= 0 && bsn != ((tbf->dir.dl.v_a - 1) & mod_sns); |
| 1186 | i--, bsn = (bsn - 1) & mod_sns) { |
| 1187 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1188 | if (bit) { |
| 1189 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1190 | "ack for BSN=%d\n", bsn); |
| 1191 | tbf->dir.dl.v_b[bsn & mod_sns_half] |
| 1192 | = 'A'; |
| 1193 | } else { |
| 1194 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1195 | "NACK for BSN=%d\n", bsn); |
| 1196 | tbf->dir.dl.v_b[bsn & mod_sns_half] |
| 1197 | = 'N'; |
| 1198 | } |
| 1199 | } |
| 1200 | } else { |
| 1201 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack range is out of " |
| 1202 | "V(A)..V(S) range\n"); |
| 1203 | } |
| 1204 | |
| 1205 | /* raise V(A), if possible */ |
| 1206 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1207 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1208 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] == 'A') { |
| 1209 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'I'; |
| 1210 | /* mark invalid */ |
| 1211 | tbf->dir.dl.v_a = (tbf->dir.dl.v_a + 1) |
| 1212 | & mod_sns; |
| 1213 | } else |
| 1214 | break; |
| 1215 | } |
| 1216 | |
| 1217 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 1218 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1219 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1220 | show_v_b[i] = tbf->dir.dl.v_b[bsn & mod_sns_half]; |
| 1221 | if (show_v_b[i] == 0) |
| 1222 | show_v_b[i] = ' '; |
| 1223 | } |
| 1224 | show_v_b[i] = '\0'; |
| 1225 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 1226 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 1227 | "X=Resend-Unacked\n", tbf->dir.dl.v_a, show_v_b, |
| 1228 | (tbf->dir.dl.v_s - 1) & mod_sns); |
| 1229 | |
| 1230 | return 0; |
| 1231 | } |
| 1232 | |
| 1233 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 1234 | |
| 1235 | /* check for LLC PDU in the LLC Queue */ |
| 1236 | msg = msgb_dequeue(&tbf->llc_queue); |
| 1237 | if (!msg) { |
| 1238 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 1239 | |
| 1240 | /* no message, start T3193, change state to RELEASE */ |
| 1241 | LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we " |
| 1242 | "release.\n"); |
Andreas Eversberg | b3c6f6c | 2012-07-06 07:40:08 +0200 | [diff] [blame] | 1243 | /* start T3193 */ |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame^] | 1244 | tbf_timer_start(tbf, 3193, bts->t3193_msec / 1000, |
| 1245 | bts->t3193_msec & 1000); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1246 | tbf_new_state(tbf, GPRS_RLCMAC_WAIT_RELEASE); |
| 1247 | |
| 1248 | return 0; |
| 1249 | } |
| 1250 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1251 | tbf->llc_length = msg->len; |
| 1252 | msgb_free(msg); |
| 1253 | |
| 1254 | /* we have a message, so we trigger downlink assignment, and there |
| 1255 | * set the state to ASSIGN. also we set old_downlink, because we |
| 1256 | * re-use this tbf. */ |
| 1257 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, " |
| 1258 | "because another LLC PDU has arrived in between\n"); |
| 1259 | memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); /* reset RLC states */ |
| 1260 | gprs_rlcmac_trigger_downlink_assignment(tbf, 1); |
| 1261 | |
| 1262 | return 0; |
| 1263 | } |
| 1264 | |
| 1265 | |
| 1266 | struct msgb *gprs_rlcmac_send_packet_downlink_assignment( |
| 1267 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 1268 | { |
| 1269 | struct msgb *msg; |
| 1270 | struct gprs_rlcmac_tbf *new_tbf; |
| 1271 | |
| 1272 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 1273 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling is already " |
| 1274 | "sheduled for TBF=%d, so we must wait for downlink " |
| 1275 | "assignment...\n", tbf->tfi); |
| 1276 | return NULL; |
| 1277 | } |
| 1278 | |
| 1279 | /* on uplink TBF we get the downlink TBF to be assigned. */ |
| 1280 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 1281 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF); |
| 1282 | else |
| 1283 | new_tbf = tbf; |
| 1284 | if (!new_tbf) { |
| 1285 | LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink " |
| 1286 | "assignment at uplink TBF=%d, but there is no downlink " |
| 1287 | "TBF\n", tbf->tfi); |
| 1288 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1289 | return NULL; |
| 1290 | } |
| 1291 | |
| 1292 | msg = msgb_alloc(23, "rlcmac_dl_ass"); |
| 1293 | if (!msg) |
| 1294 | return NULL; |
| 1295 | bitvec *ass_vec = bitvec_alloc(23); |
| 1296 | if (!ass_vec) { |
| 1297 | msgb_free(msg); |
| 1298 | return NULL; |
| 1299 | } |
| 1300 | bitvec_unhex(ass_vec, |
| 1301 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 1302 | write_packet_downlink_assignment(ass_vec, tbf->tfi, |
| 1303 | (tbf->direction == GPRS_RLCMAC_DL_TBF), new_tbf->tfi, |
| 1304 | new_tbf->arfcn, new_tbf->ts, new_tbf->ta, new_tbf->tsc, |
| 1305 | POLLING_ASSIGNMENT); |
| 1306 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
| 1307 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t)); |
| 1308 | LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n"); |
| 1309 | decode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
| 1310 | LOGPC(DRLCMAC, LOGL_NOTICE, "\n"); |
| 1311 | LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Packet Downlink Assignment -------------------------\n"); |
| 1312 | bitvec_free(ass_vec); |
| 1313 | |
| 1314 | #if POLLING_ASSIGNMENT == 1 |
| 1315 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1316 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1317 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; |
| 1318 | #else |
| 1319 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1320 | #endif |
| 1321 | |
| 1322 | return msg; |
| 1323 | } |
| 1324 | |
| 1325 | static void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf, uint8_t poll) |
| 1326 | { |
| 1327 | LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u TLLI: 0x%08x Immidiate Assignment (CCCH)\n", tbf->tfi, tbf->tlli); |
| 1328 | bitvec *immediate_assignment = bitvec_alloc(23); |
| 1329 | bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 1330 | /* use request reference that has maximum distance to current time, |
| 1331 | * so the assignment will not conflict with possible RACH requests. */ |
| 1332 | 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); |
| 1333 | pcu_l1if_tx_agch(immediate_assignment, len); |
| 1334 | bitvec_free(immediate_assignment); |
| 1335 | } |
| 1336 | |
| 1337 | /* depending on the current TBF, we assign on PACCH or AGCH */ |
| 1338 | void gprs_rlcmac_trigger_downlink_assignment(gprs_rlcmac_tbf *tbf, |
| 1339 | uint8_t old_downlink) |
| 1340 | { |
| 1341 | gprs_rlcmac_tbf *old_tbf; |
| 1342 | |
| 1343 | #ifdef DEBUG_DL_ASS_IDLE |
| 1344 | LOGP(DRLCMAC, LOGL_ERROR, "**** DEBUGGING DOWNLINK ASSIGNMENT ****\n"); |
| 1345 | #endif |
| 1346 | |
| 1347 | /* stop pending timer */ |
| 1348 | tbf_timer_stop(tbf); |
| 1349 | |
| 1350 | /* check for downlink tbf: */ |
| 1351 | if (old_downlink) |
| 1352 | old_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF); |
| 1353 | else |
| 1354 | old_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); |
| 1355 | if (old_tbf) { |
| 1356 | #ifdef DEBUG_DL_ASS_IDLE |
| 1357 | LOGP(DRLCMAC, LOGL_ERROR, "We must wait for current TBF to be " |
| 1358 | "released.\n"); |
| 1359 | /* wait one second until assignment */ |
| 1360 | tbf_timer_start(tbf, 1234, 1,0); |
| 1361 | #else |
| 1362 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on " |
| 1363 | "PACCH, because %slink TBF=%d exists for TLLI\n", |
| 1364 | (tbf->direction == GPRS_RLCMAC_DL_TBF) ? "down" : "up", |
| 1365 | old_tbf->tfi); |
| 1366 | old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
| 1367 | /* use TA from old TBF */ |
| 1368 | tbf->ta = old_tbf->ta; |
| 1369 | /* change state */ |
| 1370 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
| 1371 | /* start timer */ |
| 1372 | tbf_timer_start(tbf, 0, Tassign_pacch); |
| 1373 | #endif |
| 1374 | } else { |
| 1375 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on AGCH, " |
| 1376 | "because no uplink/downlink TBF exists for TLLI. " |
| 1377 | "(providing last timing advance)\n"); |
| 1378 | /* send immediate assignment */ |
| 1379 | gprs_rlcmac_downlink_assignment(tbf, 0); |
| 1380 | /* change state */ |
| 1381 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
| 1382 | /* start timer */ |
| 1383 | tbf_timer_start(tbf, 0, Tassign_agch); |
| 1384 | } |
| 1385 | } |
| 1386 | |