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 | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 23 | #include <gprs_rlcmac_ctrl.h> |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 24 | #include <pcu_l1_if.h> |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 25 | |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 26 | extern void *tall_pcu_ctx; |
| 27 | |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 28 | extern "C" { |
| 29 | int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, |
| 30 | uint8_t num_frames, uint32_t num_octets); |
| 31 | } |
| 32 | |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 33 | /* After receiving these frames, we send ack/nack. */ |
| 34 | #define SEND_ACK_AFTER_FRAMES 20 |
| 35 | |
| 36 | /* After sending these frames, we poll for ack/nack. */ |
| 37 | #define POLL_ACK_AFTER_FRAMES 10 |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 38 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 39 | /* If acknowledgement to uplink/downlin assignmentshould be polled */ |
| 40 | #define POLLING_ASSIGNMENT 0 |
| 41 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 42 | extern "C" { |
| 43 | /* TS 04.60 10.2.2 */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 44 | struct rlc_ul_header { |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 45 | uint8_t r:1, |
| 46 | si:1, |
| 47 | cv:4, |
| 48 | pt:2; |
| 49 | uint8_t ti:1, |
| 50 | tfi:5, |
| 51 | pi:1, |
| 52 | spare:1; |
| 53 | uint8_t e:1, |
| 54 | bsn:7; |
| 55 | } __attribute__ ((packed)); |
| 56 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 57 | struct rlc_dl_header { |
| 58 | uint8_t usf:3, |
| 59 | s_p:1, |
| 60 | rrbp:2, |
| 61 | pt:2; |
| 62 | uint8_t fbi:1, |
| 63 | tfi:5, |
| 64 | pr:2; |
| 65 | uint8_t e:1, |
| 66 | bsn:7; |
| 67 | } __attribute__ ((packed)); |
| 68 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 69 | struct rlc_li_field { |
| 70 | uint8_t e:1, |
| 71 | m:1, |
| 72 | li:6; |
| 73 | } __attribute__ ((packed)); |
| 74 | } |
| 75 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 76 | int gprs_rlcmac_poll_timeout(struct gprs_rlcmac_tbf *tbf) |
| 77 | { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 78 | LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for %s TBF=%d\n", |
| 79 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 80 | |
| 81 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 82 | |
| 83 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 84 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling PACKET " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 85 | "CONTROL ACK for PACKET UPLINK ACK\n"); |
| 86 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
| 87 | if (tbf->state == GPRS_RLCMAC_FINISHED) { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 88 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 89 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 90 | tbf->dir.ul.n3103++; |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 91 | if (tbf->dir.ul.n3103 == bts->n3103) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 92 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 93 | "- N3103 exceeded\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 94 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 95 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 96 | return 0; |
| 97 | } |
| 98 | /* reschedule UL ack */ |
| 99 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 100 | } |
| 101 | } else |
| 102 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 103 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling PACKET " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 104 | "CONTROL ACK for PACKET UPLINK ASSIGNMENT.\n"); |
| 105 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 106 | } else |
| 107 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 108 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling PACKET " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 109 | "CONTROL ACK for PACKET DOWNLINK ASSIGNMENT.\n"); |
| 110 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 111 | /* in case out downlink assigment failed: */ |
| 112 | if (tbf->state == GPRS_RLCMAC_ASSIGN) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 113 | LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment failed\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 114 | tbf_free(tbf); |
| 115 | } |
| 116 | } else |
| 117 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 118 | { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 119 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 120 | |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 121 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling PACKET " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 122 | " DOWNLINK ACK.\n"); |
| 123 | tbf->dir.dl.n3105++; |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 124 | if (tbf->dir.dl.n3105 == bts->n3105) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 125 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 126 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 127 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 128 | return 0; |
| 129 | } |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 130 | } else |
| 131 | LOGP(DRLCMAC, LOGL_ERROR, "- Poll Timeout, but no event!\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
Andreas Eversberg | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 136 | int gprs_rlcmac_rcv_control_ack(uint8_t trx, uint8_t ts, uint32_t fn, |
| 137 | uint32_t tlli) |
| 138 | { |
| 139 | struct gprs_rlcmac_tbf *tbf; |
| 140 | uint8_t tfi; |
| 141 | |
| 142 | tbf = tbf_by_poll_fn(fn, trx, ts); |
| 143 | if (!tbf) { |
| 144 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " |
| 145 | "unknown FN=%u TLL=0x%08x (TRX %d TS %d)\n", |
| 146 | fn, tlli, trx, ts); |
| 147 | return -EINVAL; |
| 148 | } |
| 149 | tfi = tbf->tfi; |
| 150 | if (tlli != tbf->tlli) { |
| 151 | LOGP(DRLCMAC, LOGL_INFO, "Phone changed TLLI to " |
| 152 | "0x%08x\n", tlli); |
| 153 | tbf->tlli = tlli; |
| 154 | } |
| 155 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Control Ack\n", tbf->tfi, tbf->tlli); |
| 156 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 157 | |
| 158 | /* check if this control ack belongs to packet uplink ack */ |
| 159 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
| 160 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| 161 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
| 162 | tbf_free(tbf); |
| 163 | return 0; |
| 164 | } |
| 165 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
| 166 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] DOWNLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| 167 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 168 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 169 | tbf = tbf_by_tlli(tbf->tlli, |
| 170 | GPRS_RLCMAC_DL_TBF); |
| 171 | if (!tbf) { |
| 172 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL " |
| 173 | "TBF is gone\n"); |
| 174 | return -EIO; |
| 175 | } |
| 176 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 177 | tbf_assign_control_ts(tbf); |
| 178 | return 0; |
| 179 | } |
| 180 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
| 181 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [DOWNLINK] UPLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| 182 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 183 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 184 | tbf = tbf_by_tlli(tbf->tlli, |
| 185 | GPRS_RLCMAC_UL_TBF); |
| 186 | if (!tbf) { |
| 187 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL " |
| 188 | "TBF is gone\n"); |
| 189 | return -EIO; |
| 190 | } |
| 191 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 192 | tbf_assign_control_ts(tbf); |
| 193 | return 0; |
| 194 | } |
| 195 | LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK " |
| 196 | "at no request\n"); |
| 197 | return EINVAL; |
| 198 | } |
| 199 | |
| 200 | int gprs_rlcmac_rcv_downlink_ack(uint8_t trx, uint8_t ts, uint32_t fn, uint16_t tfi, uint8_t final, uint8_t ssn, uint8_t *rbb, uint8_t request) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 201 | { |
Andreas Eversberg | c8466f4 | 2012-07-15 19:34:53 +0200 | [diff] [blame] | 202 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 203 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | 0f13c40 | 2012-07-16 11:59:23 +0200 | [diff] [blame] | 204 | int rc; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 205 | |
Andreas Eversberg | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 206 | tbf = tbf_by_poll_fn(fn, trx, ts); |
| 207 | if (!tbf) { |
| 208 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
| 209 | "unknown FN=%u TBF=%d (TRX %d TS %d)\n", |
| 210 | fn, tfi, trx, ts); |
| 211 | return -EINVAL; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 212 | } |
Andreas Eversberg | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 213 | /* reset N3105 */ |
| 214 | tbf->dir.dl.n3105 = 0; |
| 215 | /* stop timer T3191 */ |
| 216 | tbf_timer_stop(tbf); |
| 217 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli); |
| 218 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 219 | |
| 220 | rc = gprs_rlcmac_downlink_ack(tbf, final, ssn, rbb); |
| 221 | if (rc == 1) { |
| 222 | tbf_free(tbf); |
| 223 | return 0; |
| 224 | } |
| 225 | /* check for channel request */ |
| 226 | if (request) { |
| 227 | uint8_t trx, ts; |
| 228 | struct gprs_rlcmac_tbf *ul_tbf; |
| 229 | |
| 230 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack " |
| 231 | "message, so we provide one:\n"); |
| 232 | /* create new TBF, use sme TRX as DL TBF */ |
| 233 | tfi = tfi_alloc(GPRS_RLCMAC_UL_TBF, &trx, &ts, tbf->trx, tbf->first_ts); |
| 234 | if (tfi < 0) { |
| 235 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 236 | /* FIXME: send reject */ |
| 237 | return -EIO; |
| 238 | } |
| 239 | /* use multislot class of downlink TBF */ |
| 240 | ul_tbf = tbf_alloc(tbf, GPRS_RLCMAC_UL_TBF, tfi, trx, |
| 241 | ts, tbf->ms_class, 0); |
| 242 | if (!ul_tbf) { |
| 243 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 244 | /* FIXME: send reject */ |
| 245 | return -EIO; |
| 246 | } |
| 247 | ul_tbf->tlli = tbf->tlli; |
| 248 | ul_tbf->tlli_valid = 1; /* no contention resolution */ |
| 249 | ul_tbf->dir.ul.contention_resolution_done = 1; |
| 250 | ul_tbf->ta = tbf->ta; /* use current TA */ |
| 251 | tbf_new_state(ul_tbf, GPRS_RLCMAC_ASSIGN); |
| 252 | tbf_timer_start(ul_tbf, 3169, bts->t3169, 0); |
| 253 | /* schedule uplink assignment */ |
| 254 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
| 255 | } |
| 256 | |
| 257 | return 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 258 | } |
| 259 | |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 260 | #ifdef DEBUG_DL_ASS_IDLE |
| 261 | char debug_imsi[16]; |
| 262 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 263 | |
| 264 | void tbf_timer_cb(void *_tbf) |
| 265 | { |
| 266 | struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf; |
| 267 | |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 268 | LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d timer %u expired.\n", |
| 269 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 270 | tbf->T); |
| 271 | |
| 272 | tbf->num_T_exp++; |
| 273 | |
| 274 | switch (tbf->T) { |
| 275 | #ifdef DEBUG_DL_ASS_IDLE |
| 276 | case 1234: |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 277 | gprs_rlcmac_trigger_downlink_assignment(tbf, NULL, debug_imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 278 | break; |
| 279 | #endif |
| 280 | case 0: /* assignment */ |
| 281 | /* change state to FLOW, so scheduler will start transmission */ |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 282 | if (tbf->state == GPRS_RLCMAC_ASSIGN) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 283 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 284 | tbf_assign_control_ts(tbf); |
| 285 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 286 | LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not in assign " |
| 287 | "state\n"); |
| 288 | break; |
| 289 | case 3169: |
| 290 | case 3191: |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 291 | case 3195: |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 292 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF T%d timeout during " |
| 293 | "transsmission\n", tbf->T); |
| 294 | /* fall through */ |
| 295 | case 3193: |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 296 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n"); |
| 297 | /* free TBF */ |
| 298 | tbf_free(tbf); |
| 299 | break; |
| 300 | default: |
| 301 | LOGP(DRLCMAC, LOGL_ERROR, "Timer expired in unknown mode: %u\n", |
| 302 | tbf->T); |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * UL data block flow |
| 308 | */ |
| 309 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 310 | /* get TLLI from received UL data block */ |
| 311 | static int tlli_from_ul_data(uint8_t *data, uint8_t len, uint32_t *tlli) |
| 312 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 313 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 314 | struct rlc_li_field *li; |
| 315 | uint8_t e; |
| 316 | |
| 317 | if (!rh->ti) |
| 318 | return -EINVAL; |
| 319 | |
| 320 | data += 3; |
| 321 | len -= 3; |
| 322 | e = rh->e; |
| 323 | /* if E is not set (LI follows) */ |
| 324 | while (!e) { |
| 325 | if (!len) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 326 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA LI extended, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 327 | "but no more data\n"); |
| 328 | return -EINVAL; |
| 329 | } |
| 330 | /* get new E */ |
| 331 | li = (struct rlc_li_field *)data; |
| 332 | if (li->e == 0) /* if LI==0, E is interpreted as '1' */ |
| 333 | e = 1; |
| 334 | else |
| 335 | e = li->e; |
| 336 | data++; |
| 337 | len--; |
| 338 | } |
| 339 | if (len < 4) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 340 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of frame " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 341 | "border\n"); |
| 342 | return -EINVAL; |
| 343 | } |
| 344 | *tlli = ntohl(*((uint32_t *)data)); |
| 345 | |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | /* Store received block data in LLC message(s) and forward to SGSN if complete. |
| 350 | */ |
| 351 | static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data, |
| 352 | uint8_t len) |
| 353 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 354 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 355 | uint8_t e, m; |
| 356 | struct rlc_li_field *li; |
| 357 | uint8_t frame_offset[16], offset = 0, chunk; |
| 358 | int i, frames = 0; |
| 359 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 360 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 361 | |
| 362 | data += 3; |
| 363 | len -= 3; |
| 364 | e = rh->e; /* if extended */ |
| 365 | m = 1; /* more frames, that means: the first frame */ |
| 366 | |
| 367 | /* Parse frame offsets from length indicator(s), if any. */ |
| 368 | while (1) { |
| 369 | if (frames == (int)sizeof(frame_offset)) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 370 | LOGP(DRLCMACUL, LOGL_ERROR, "Too many frames in " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 371 | "block\n"); |
| 372 | return -EINVAL; |
| 373 | } |
| 374 | frame_offset[frames++] = offset; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 375 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 376 | "%d\n", frames, offset); |
| 377 | if (!len) |
| 378 | break; |
| 379 | /* M == 0 and E == 0 is not allowed in this version. */ |
| 380 | if (!m && !e) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 381 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 382 | "ignored, because M='0' and E='0'.\n", |
| 383 | tbf->tfi); |
| 384 | return 0; |
| 385 | } |
| 386 | /* no more frames in this segment */ |
| 387 | if (e) { |
| 388 | break; |
| 389 | } |
| 390 | /* There is a new frame and an LI that delimits it. */ |
| 391 | if (m) { |
| 392 | li = (struct rlc_li_field *)data; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 393 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n", |
| 394 | li->li); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 395 | /* Special case: LI == 0 |
| 396 | * If the last segment would fit precisely into the |
| 397 | * rest of the RLC MAC block, there would be no way |
| 398 | * to delimit that this segment ends and is not |
| 399 | * continued in the next block. |
| 400 | * The special LI (0) is used to force the segment to |
| 401 | * extend into the next block, so it is delimited there. |
| 402 | * This LI must be skipped. Also it is the last LI. |
| 403 | */ |
| 404 | if (li->li == 0) { |
| 405 | data++; |
| 406 | len--; |
| 407 | m = 1; /* M is ignored, we know there is more */ |
| 408 | break; /* handle E as '1', so we break! */ |
| 409 | } |
| 410 | e = li->e; |
| 411 | m = li->m; |
| 412 | offset += li->li; |
| 413 | data++; |
| 414 | len--; |
| 415 | continue; |
| 416 | } |
| 417 | } |
| 418 | if (!m) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 419 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 420 | "data\n"); |
| 421 | } |
| 422 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 423 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 424 | len); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 425 | /* TLLI */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 426 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 427 | if (len < 4) { |
| 428 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of " |
| 429 | "frame border\n"); |
| 430 | return -EINVAL; |
| 431 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 432 | data += 4; |
| 433 | len -= 4; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 434 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: " |
| 435 | "%d\n", len); |
| 436 | } |
| 437 | |
| 438 | /* PFI */ |
| 439 | if (rh->pi) { |
| 440 | LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, " |
| 441 | "please disable in SYSTEM INFORMATION\n"); |
| 442 | if (len < 1) { |
| 443 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA PFI out of " |
| 444 | "frame border\n"); |
| 445 | return -EINVAL; |
| 446 | } |
| 447 | data++; |
| 448 | len--; |
| 449 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 450 | "%d\n", len); |
| 451 | } |
| 452 | |
| 453 | /* Now we have: |
| 454 | * - a list of frames offsets: frame_offset[] |
| 455 | * - number of frames: i |
| 456 | * - m == 0: Last frame carries spare data (end of TBF). |
| 457 | */ |
| 458 | |
| 459 | /* Check if last offset would exceed frame. */ |
| 460 | if (offset > len) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 461 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d ignored, " |
| 462 | "because LI delimits data that exceeds block size.\n", |
| 463 | tbf->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 464 | return -EINVAL; |
| 465 | } |
| 466 | |
| 467 | /* create LLC frames */ |
| 468 | for (i = 0; i < frames; i++) { |
| 469 | /* last frame ? */ |
| 470 | if (i == frames - 1) { |
| 471 | /* no more data in last frame */ |
| 472 | if (!m) |
| 473 | break; |
| 474 | /* data until end of frame */ |
| 475 | chunk = len - frame_offset[i]; |
| 476 | } else { |
| 477 | /* data until next frame */ |
| 478 | chunk = frame_offset[i + 1] - frame_offset[i]; |
| 479 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 480 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 481 | "frame at %d.\n", chunk, tbf->llc_index); |
| 482 | if (tbf->llc_index + chunk > LLC_MAX_LEN) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 483 | LOGP(DRLCMACUL, LOGL_NOTICE, "LLC frame exceeds " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 484 | "maximum size.\n"); |
| 485 | chunk = LLC_MAX_LEN - tbf->llc_index; |
| 486 | } |
| 487 | memcpy(tbf->llc_frame + tbf->llc_index, data + frame_offset[i], |
| 488 | chunk); |
| 489 | tbf->llc_index += chunk; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 490 | /* not last frame. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 491 | if (i != frames - 1) { |
| 492 | /* send frame to SGSN */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 493 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 494 | "TBF=%d: len=%d\n", tbf->tfi, tbf->llc_index); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 495 | gprs_rlcmac_tx_ul_ud(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 496 | tbf->llc_index = 0; /* reset frame space */ |
| 497 | /* also check if CV==0, because the frame may fill up the |
| 498 | * block precisely, then it is also complete. normally the |
| 499 | * frame would be extended into the next block with a 0-length |
| 500 | * delimiter added to this block. */ |
| 501 | } else if (rh->cv == 0) { |
| 502 | /* send frame to SGSN */ |
| 503 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 504 | "TBF=%d that fits precisely in last block: " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 505 | "len=%d\n", tbf->tfi, tbf->llc_index); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 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 | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 527 | msg = write_packet_uplink_ack(tbf, final); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 528 | if (!msg) |
| 529 | return NULL; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 530 | |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 531 | /* now we must set this flag, so we are allowed to assign downlink |
| 532 | * TBF on PACCH. it is only allowed when TLLI is aknowledged. */ |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 533 | tbf->dir.ul.contention_resolution_done = 1; |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 534 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 535 | if (final) { |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 536 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 537 | tbf->poll_fn = (fn + 13) % 2715648; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 538 | /* waiting for final acknowledge */ |
| 539 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK; |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 540 | tbf->dir.ul.final_ack_sent = 1; |
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 | */ |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 551 | int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t trx, uint8_t ts, |
| 552 | uint8_t *data, uint8_t len) |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 553 | { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 554 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 555 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 556 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 557 | uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index; |
| 558 | int rc; |
| 559 | |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 560 | switch (len) { |
| 561 | case 54: |
| 562 | /* omitting spare bits */ |
| 563 | len = 53; |
| 564 | break; |
| 565 | case 40: |
| 566 | /* omitting spare bits */ |
| 567 | len = 39; |
| 568 | break; |
| 569 | case 34: |
| 570 | /* omitting spare bits */ |
| 571 | len = 33; |
| 572 | break; |
| 573 | case 23: |
| 574 | break; |
| 575 | default: |
| 576 | LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid" |
| 577 | "length: %d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 578 | return -EINVAL; |
| 579 | } |
| 580 | |
| 581 | /* find TBF inst from given TFI */ |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 582 | tbf = tbf_by_tfi(rh->tfi, trx, ts, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 583 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 584 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TBF=%d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 585 | rh->tfi); |
| 586 | return 0; |
| 587 | } |
| 588 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 589 | LOGP(DRLCMACUL, LOGL_DEBUG, "UL DATA TBF=%d received (V(Q)=%d .. " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 590 | "V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r); |
| 591 | |
| 592 | /* get TLLI */ |
| 593 | if (!tbf->tlli_valid) { |
Andreas Eversberg | bc65586 | 2012-07-23 18:13:31 +0200 | [diff] [blame] | 594 | struct gprs_rlcmac_tbf *dl_tbf; |
| 595 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 596 | /* no TLLI yet */ |
| 597 | if (!rh->ti) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 598 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d without " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 599 | "TLLI, but no TLLI received yet\n", rh->tfi); |
| 600 | return 0; |
| 601 | } |
| 602 | rc = tlli_from_ul_data(data, len, &tbf->tlli); |
| 603 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 604 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 605 | "of UL DATA TBF=%d.\n", rh->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 606 | return 0; |
| 607 | } |
| 608 | tbf->tlli_valid = 1; |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 609 | LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of " |
| 610 | "UL DATA TBF=%d.\n", tbf->tlli, rh->tfi); |
Andreas Eversberg | bc65586 | 2012-07-23 18:13:31 +0200 | [diff] [blame] | 611 | if ((dl_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF))) { |
| 612 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 613 | "TLLI=0x%08x while DL TBF=%d still exists. " |
| 614 | "Killing pending DL TBF\n", tbf->tlli, |
| 615 | dl_tbf->tfi); |
| 616 | tbf_free(dl_tbf); |
| 617 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 618 | /* already have TLLI, but we stille get another one */ |
| 619 | } else if (rh->ti) { |
| 620 | uint32_t tlli; |
| 621 | rc = tlli_from_ul_data(data, len, &tlli); |
| 622 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 623 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 624 | "of UL DATA TBF=%d.\n", rh->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 625 | return 0; |
| 626 | } |
| 627 | if (tlli != tbf->tlli) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 628 | LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 629 | "DATA TBF=%d. (Ignoring due to contention " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 630 | "resolution)\n", rh->tfi); |
| 631 | return 0; |
| 632 | } |
| 633 | } |
| 634 | |
| 635 | mod_sns = tbf->sns - 1; |
| 636 | mod_sns_half = (tbf->sns >> 1) - 1; |
| 637 | |
| 638 | /* restart T3169 */ |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 639 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 640 | |
| 641 | /* Increment RX-counter */ |
| 642 | tbf->dir.ul.rx_counter++; |
| 643 | |
| 644 | /* current block relative to lowest unreceived block */ |
| 645 | offset_v_q = (rh->bsn - tbf->dir.ul.v_q) & mod_sns; |
| 646 | /* If out of window (may happen if blocks below V(Q) are received |
| 647 | * again. */ |
| 648 | if (offset_v_q >= tbf->ws) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 649 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 650 | "%d..%d (it's normal)\n", rh->bsn, tbf->dir.ul.v_q, |
| 651 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 652 | return 0; |
| 653 | } |
| 654 | /* Write block to buffer and set receive state array. */ |
| 655 | index = rh->bsn & mod_sns_half; /* memory index of block */ |
| 656 | memcpy(tbf->rlc_block[index], data, len); /* Copy block. */ |
| 657 | tbf->rlc_block_len[index] = len; |
| 658 | tbf->dir.ul.v_n[index] = 'R'; /* Mark received block. */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 659 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 660 | rh->bsn, tbf->dir.ul.v_q, |
| 661 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 662 | /* Raise V(R) to highest received sequence number not received. */ |
| 663 | offset_v_r = (rh->bsn + 1 - tbf->dir.ul.v_r) & mod_sns; |
| 664 | if (offset_v_r < (tbf->sns >> 1)) { /* Positive offset, so raise. */ |
| 665 | while (offset_v_r--) { |
| 666 | if (offset_v_r) /* all except the received block */ |
| 667 | tbf->dir.ul.v_n[tbf->dir.ul.v_r & mod_sns_half] |
| 668 | = 'N'; /* Mark block as not received */ |
| 669 | tbf->dir.ul.v_r = (tbf->dir.ul.v_r + 1) & mod_sns; |
| 670 | /* Inc V(R). */ |
| 671 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 672 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 673 | tbf->dir.ul.v_r); |
| 674 | } |
| 675 | |
| 676 | /* Raise V(Q) if possible, and retrieve LLC frames from blocks. |
| 677 | * This is looped until there is a gap (non received block) or |
| 678 | * the window is empty.*/ |
| 679 | while (tbf->dir.ul.v_q != tbf->dir.ul.v_r && tbf->dir.ul.v_n[ |
| 680 | (index = tbf->dir.ul.v_q & mod_sns_half)] == 'R') { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 681 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 682 | "V(Q) to %d\n", tbf->dir.ul.v_q, |
| 683 | (tbf->dir.ul.v_q + 1) & mod_sns); |
| 684 | /* get LLC data from block */ |
| 685 | gprs_rlcmac_assemble_llc(tbf, tbf->rlc_block[index], |
| 686 | tbf->rlc_block_len[index]); |
| 687 | /* raise V(Q), because block already received */ |
| 688 | tbf->dir.ul.v_q = (tbf->dir.ul.v_q + 1) & mod_sns; |
| 689 | } |
| 690 | |
| 691 | /* Check CV of last frame in buffer */ |
| 692 | if (tbf->state == GPRS_RLCMAC_FLOW /* still in flow state */ |
| 693 | && tbf->dir.ul.v_q == tbf->dir.ul.v_r) { /* if complete */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 694 | struct rlc_ul_header *last_rh = (struct rlc_ul_header *) |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 695 | tbf->rlc_block[(tbf->dir.ul.v_r - 1) & mod_sns_half]; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 696 | LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 697 | "last block: BSN=%d CV=%d\n", last_rh->bsn, |
| 698 | last_rh->cv); |
| 699 | if (last_rh->cv == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 700 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 701 | "TBF\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 702 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 703 | /* Reset N3103 counter. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 704 | tbf->dir.ul.n3103 = 0; |
| 705 | } |
| 706 | } |
| 707 | |
| 708 | /* If TLLI is included or if we received half of the window, we send |
| 709 | * an ack/nack */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 710 | if (rh->si || rh->ti || tbf->state == GPRS_RLCMAC_FINISHED |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 711 | || (tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 712 | if (rh->si) { |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 713 | LOGP(DRLCMACUL, LOGL_NOTICE, "- Scheduling Ack/Nack, " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 714 | "because MS is stalled.\n"); |
| 715 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 716 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 717 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 718 | "because TLLI is included.\n"); |
| 719 | } |
| 720 | if (tbf->state == GPRS_RLCMAC_FINISHED) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 721 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 722 | "because last block has CV==0.\n"); |
| 723 | } |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 724 | if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 725 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 726 | "because %d frames received.\n", |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 727 | SEND_ACK_AFTER_FRAMES); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 728 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 729 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) { |
| 730 | /* trigger sending at next RTS */ |
| 731 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 732 | } else { |
| 733 | /* already triggered */ |
| 734 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Sending Ack/Nack is " |
| 735 | "already triggered, don't schedule!\n"); |
| 736 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 737 | } |
| 738 | |
| 739 | return 0; |
| 740 | } |
| 741 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 742 | struct msgb *gprs_rlcmac_send_packet_uplink_assignment( |
| 743 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 744 | { |
| 745 | struct msgb *msg; |
| 746 | struct gprs_rlcmac_tbf *new_tbf; |
| 747 | |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 748 | #if POLLING_ASSIGNMENT == 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 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 | } |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 755 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 756 | |
| 757 | /* on down TBF we get the uplink TBF to be assigned. */ |
| 758 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 759 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); |
| 760 | else |
| 761 | new_tbf = tbf; |
| 762 | |
| 763 | if (!new_tbf) { |
| 764 | LOGP(DRLCMACUL, LOGL_ERROR, "We have a schedule for uplink " |
| 765 | "assignment at downlink TBF=%d, but there is no uplink " |
| 766 | "TBF\n", tbf->tfi); |
| 767 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 768 | return NULL; |
| 769 | } |
| 770 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 771 | LOGP(DRLCMAC, LOGL_INFO, "TBF: START TFI: %u TLLI: 0x%08x Packet Uplink Assignment (PACCH)\n", new_tbf->tfi, new_tbf->tlli); |
Andreas Eversberg | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 772 | |
| 773 | msg = write_packet_uplink_assignment(tbf->tfi, |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 774 | (tbf->direction == GPRS_RLCMAC_DL_TBF), 0, 0, new_tbf, |
| 775 | POLLING_ASSIGNMENT); |
Andreas Eversberg | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 776 | if (!msg) |
| 777 | return NULL; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 778 | |
| 779 | #if POLLING_ASSIGNMENT == 1 |
| 780 | FIXME process does not work, also the acknowledgement is not checked. |
| 781 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 782 | tbf->poll_fn = (fn + 13) % 2715648; |
| 783 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK; |
| 784 | #else |
| 785 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 786 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 787 | tbf_assign_control_ts(new_tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 788 | #endif |
| 789 | |
| 790 | return msg; |
| 791 | } |
| 792 | |
| 793 | int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta) |
| 794 | { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 795 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 796 | struct gprs_rlcmac_tbf *tbf; |
| 797 | uint8_t trx, ts; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 798 | int8_t tfi; /* must be signed */ |
Andreas Eversberg | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 799 | uint8_t imm_ass[23]; |
| 800 | int rc; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 801 | |
| 802 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide " |
| 803 | "one:\n"); |
| 804 | // Create new TBF |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 805 | tfi = tfi_alloc(GPRS_RLCMAC_UL_TBF, &trx, &ts, -1, -1); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 806 | if (tfi < 0) { |
| 807 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 808 | /* FIXME: send reject */ |
| 809 | return -EBUSY; |
| 810 | } |
Andreas Eversberg | f298fa8 | 2012-07-13 14:50:57 +0200 | [diff] [blame] | 811 | /* set class to 0, since we don't know the multislot class yet */ |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 812 | tbf = tbf_alloc(NULL, GPRS_RLCMAC_UL_TBF, tfi, trx, ts, 0, 1); |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 813 | if (!tbf) { |
| 814 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 815 | /* FIXME: send reject */ |
| 816 | return -EBUSY; |
| 817 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 818 | if (qta < 0) |
| 819 | qta = 0; |
| 820 | if (qta > 252) |
| 821 | qta = 252; |
| 822 | tbf->ta = qta >> 2; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 823 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 824 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 825 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] START TFI: %u\n", tbf->tfi); |
| 826 | LOGP(DRLCMAC, LOGL_DEBUG, "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); |
| 827 | LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u Immediate Assignment Uplink (AGCH)\n", tbf->tfi); |
Andreas Eversberg | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 828 | rc = write_immediate_assignment_uplink(imm_ass, ra, Fn, tbf->ta, tbf->arfcn, tbf->first_ts, tbf->tsc, tbf->tfi, tbf->dir.ul.usf[tbf->first_ts], 0, 0); |
| 829 | if (rc < 0) |
| 830 | return rc; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 831 | |
Andreas Eversberg | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 832 | pcu_l1if_tx_agch(imm_ass); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 833 | return 0; |
| 834 | } |
| 835 | |
| 836 | |
| 837 | /* |
| 838 | * DL data block flow |
| 839 | */ |
| 840 | |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 841 | static struct msgb *llc_dequeue(struct gprs_rlcmac_tbf *tbf) |
| 842 | { |
| 843 | struct msgb *msg; |
| 844 | struct timeval *tv, tv_now; |
| 845 | uint32_t octets = 0, frames = 0; |
| 846 | |
| 847 | gettimeofday(&tv_now, NULL); |
| 848 | |
| 849 | while ((msg = msgb_dequeue(&tbf->llc_queue))) { |
| 850 | tv = (struct timeval *)msg->data; |
| 851 | msgb_pull(msg, sizeof(*tv)); |
| 852 | if (tv->tv_sec /* not infinite */ |
| 853 | && (tv_now.tv_sec > tv->tv_sec /* and secs expired */ |
| 854 | || (tv_now.tv_sec == tv->tv_sec /* .. or if secs equal .. */ |
| 855 | && tv_now.tv_usec > tv->tv_usec))) { /* .. usecs expired */ |
| 856 | LOGP(DRLCMACDL, LOGL_NOTICE, "Discarding LLC PDU of " |
| 857 | "DL TBF=%d, because lifetime limit reached\n", |
| 858 | tbf->tfi); |
| 859 | frames++; |
| 860 | octets += msg->len; |
| 861 | msgb_free(msg); |
| 862 | continue; |
| 863 | } |
| 864 | break; |
| 865 | } |
| 866 | |
| 867 | if (frames) { |
| 868 | if (frames > 0xff) |
| 869 | frames = 0xff; |
| 870 | if (octets > 0xffffff) |
| 871 | octets = 0xffffff; |
| 872 | bssgp_tx_llc_discarded(bctx, tbf->tlli, frames, octets); |
| 873 | } |
| 874 | |
| 875 | return msg; |
| 876 | } |
| 877 | |
Andreas Eversberg | b3ded4c | 2012-07-24 10:47:24 +0200 | [diff] [blame] | 878 | static int gprs_rlcmac_debug_bw(struct gprs_rlcmac_tbf *tbf, uint16_t octets) |
| 879 | { |
| 880 | struct timeval now_tv, *bw_tv = &tbf->bw_tv; |
| 881 | uint32_t elapsed; |
| 882 | |
| 883 | tbf->bw_octets += octets; |
| 884 | |
| 885 | gettimeofday(&now_tv, NULL); |
| 886 | elapsed = ((now_tv.tv_sec - bw_tv->tv_sec) << 7) |
| 887 | + ((now_tv.tv_usec - bw_tv->tv_usec) << 7) / 1000000; |
| 888 | if (elapsed < 128) |
| 889 | return 0; |
| 890 | |
| 891 | LOGP(DRLCMACBW, LOGL_DEBUG, "DL Bandwitdh of TLLI=0x%08x: %d KBits/s\n", |
| 892 | tbf->tlli, tbf->bw_octets / elapsed); |
| 893 | |
| 894 | /* reset bandwidth values timestamp */ |
| 895 | memcpy(bw_tv, &now_tv, sizeof(struct timeval)); |
| 896 | tbf->bw_octets = 0; |
| 897 | |
| 898 | return 0; |
| 899 | } |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 900 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 901 | /* send DL data block |
| 902 | * |
| 903 | * The messages are fragmented and forwarded as data blocks. |
| 904 | */ |
| 905 | struct msgb *gprs_rlcmac_send_data_block_acknowledged( |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 906 | struct gprs_rlcmac_tbf *tbf, uint32_t fn, uint8_t ts) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 907 | { |
| 908 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 909 | struct rlc_dl_header *rh; |
| 910 | struct rlc_li_field *li; |
| 911 | uint8_t block_length; /* total length of block, including spare bits */ |
| 912 | uint8_t block_data; /* usable data of block, w/o spare bits, inc. MAC */ |
| 913 | struct msgb *msg, *dl_msg; |
| 914 | uint8_t bsn; |
| 915 | uint16_t mod_sns = tbf->sns - 1; |
| 916 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 917 | uint16_t index; |
| 918 | uint8_t *delimiter, *data, *e_pointer; |
| 919 | uint8_t len; |
| 920 | uint16_t space, chunk; |
| 921 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 922 | LOGP(DRLCMACDL, LOGL_DEBUG, "DL DATA TBF=%d downlink (V(A)==%d .. " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 923 | "V(S)==%d)\n", tbf->tfi, tbf->dir.dl.v_a, tbf->dir.dl.v_s); |
| 924 | |
| 925 | do_resend: |
| 926 | /* check if there is a block with negative acknowledgement */ |
| 927 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 928 | bsn = (bsn + 1) & mod_sns) { |
| 929 | index = (bsn & mod_sns_half); |
| 930 | if (tbf->dir.dl.v_b[index] == 'N' |
| 931 | || tbf->dir.dl.v_b[index] == 'X') { |
| 932 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", |
| 933 | bsn); |
| 934 | /* re-send block with negative aknowlegement */ |
| 935 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 936 | goto tx_block; |
| 937 | } |
| 938 | } |
| 939 | |
| 940 | /* if the window has stalled, or transfer is complete, |
| 941 | * send an unacknowledged block */ |
| 942 | if (tbf->state == GPRS_RLCMAC_FINISHED |
| 943 | || ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns) == tbf->ws) { |
| 944 | int resend = 0; |
| 945 | |
| 946 | if (tbf->state == GPRS_RLCMAC_FINISHED) |
| 947 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 948 | "because all blocks have been transmitted.\n", |
| 949 | tbf->dir.dl.v_a); |
| 950 | else |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 951 | LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 952 | "because all window is stalled.\n", |
| 953 | tbf->dir.dl.v_a); |
| 954 | /* If V(S) == V(A) and finished state, we would have received |
| 955 | * acknowledgement of all transmitted block. In this case we |
| 956 | * would have transmitted the final block, and received ack |
| 957 | * from MS. But in this case we did not receive the final ack |
| 958 | * indication from MS. This should never happen if MS works |
| 959 | * correctly. */ |
| 960 | if (tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
Andreas Eversberg | 6664a90 | 2012-07-15 06:52:19 +0200 | [diff] [blame] | 961 | LOGP(DRLCMACDL, LOGL_ERROR, "- MS acked all block, " |
| 962 | "but we still transmitting!\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 963 | /* we just send final block again */ |
| 964 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 965 | goto tx_block; |
| 966 | } |
| 967 | |
| 968 | /* cycle through all unacked blocks */ |
| 969 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 970 | bsn = (bsn + 1) & mod_sns) { |
| 971 | index = (bsn & mod_sns_half); |
| 972 | if (tbf->dir.dl.v_b[index] == 'U') { |
| 973 | /* mark to be re-send */ |
| 974 | tbf->dir.dl.v_b[index] = 'X'; |
| 975 | resend++; |
| 976 | } |
| 977 | } |
| 978 | /* At this point there should be at leasst one unacked block |
| 979 | * to be resent. If not, this is an software error. */ |
| 980 | if (resend == 0) { |
| 981 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 982 | "There are no unacknowledged blocks, but V(A) " |
| 983 | " != V(S). PLEASE FIX!\n"); |
| 984 | /* we just send final block again */ |
| 985 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 986 | goto tx_block; |
| 987 | } |
| 988 | goto do_resend; |
| 989 | } |
| 990 | |
| 991 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n", |
| 992 | tbf->dir.dl.v_s); |
| 993 | |
| 994 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 995 | index = tbf->dir.dl.v_s & mod_sns_half; |
| 996 | data = tbf->rlc_block[index]; |
Andreas Eversberg | b3c6f6c | 2012-07-06 07:40:08 +0200 | [diff] [blame] | 997 | switch (bts->initial_cs) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 998 | case 2: /* CS-2 */ |
| 999 | block_length = 34; |
| 1000 | block_data = 33; |
| 1001 | break; |
| 1002 | case 3: /* CS-3 */ |
| 1003 | block_length = 40; |
| 1004 | block_data = 39; |
| 1005 | break; |
| 1006 | case 4: /* CS-4 */ |
| 1007 | block_length = 54; |
| 1008 | block_data = 53; |
| 1009 | break; |
| 1010 | default: /* CS-1 */ |
| 1011 | block_length = 23; |
| 1012 | block_data = 23; |
| 1013 | } |
| 1014 | memset(data, 0x2b, block_data); /* spare bits will be left 0 */ |
| 1015 | rh = (struct rlc_dl_header *)data; |
| 1016 | rh->pt = 0; /* Data Block */ |
| 1017 | rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */ |
| 1018 | rh->usf = 7; /* will be set at scheduler */ |
| 1019 | rh->pr = 0; /* FIXME: power reduction */ |
| 1020 | rh->tfi = tbf->tfi; /* TFI */ |
| 1021 | rh->fbi = 0; /* Final Block Indicator, set late, if true */ |
| 1022 | rh->bsn = tbf->dir.dl.v_s; /* Block Sequence Number */ |
| 1023 | rh->e = 0; /* Extension bit, maybe set later */ |
| 1024 | e_pointer = data + 2; /* points to E of current chunk */ |
| 1025 | data += 3; |
| 1026 | delimiter = data; /* where next length header would be stored */ |
| 1027 | space = block_data - 3; |
| 1028 | while (1) { |
| 1029 | chunk = tbf->llc_length - tbf->llc_index; |
| 1030 | /* if chunk will exceed block limit */ |
| 1031 | if (chunk > space) { |
| 1032 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1033 | "larger than space (%d) left in block: copy " |
| 1034 | "only remaining space, and we are done\n", |
| 1035 | chunk, space); |
| 1036 | /* block is filled, so there is no extension */ |
| 1037 | *e_pointer |= 0x01; |
| 1038 | /* fill only space */ |
| 1039 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1040 | /* incement index */ |
| 1041 | tbf->llc_index += space; |
| 1042 | /* return data block as message */ |
| 1043 | break; |
| 1044 | } |
| 1045 | /* if FINAL chunk would fit precisely in space left */ |
| 1046 | if (chunk == space && llist_empty(&tbf->llc_queue)) { |
| 1047 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1048 | "would exactly fit into space (%d): because " |
| 1049 | "this is a final block, we don't add length " |
| 1050 | "header, and we are done\n", chunk, space); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1051 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for " |
| 1052 | "TBF=%d that fits precisely in last block: " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1053 | "len=%d\n", tbf->tfi, tbf->llc_length); |
Andreas Eversberg | b3ded4c | 2012-07-24 10:47:24 +0200 | [diff] [blame] | 1054 | gprs_rlcmac_debug_bw(tbf, tbf->llc_length); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1055 | /* block is filled, so there is no extension */ |
| 1056 | *e_pointer |= 0x01; |
| 1057 | /* fill space */ |
| 1058 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1059 | /* reset LLC frame */ |
| 1060 | tbf->llc_index = tbf->llc_length = 0; |
| 1061 | /* final block */ |
| 1062 | rh->fbi = 1; /* we indicate final block */ |
| 1063 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1064 | /* return data block as message */ |
| 1065 | break; |
| 1066 | } |
| 1067 | /* if chunk would fit exactly in space left */ |
| 1068 | if (chunk == space) { |
| 1069 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1070 | "would exactly fit into space (%d): add length " |
| 1071 | "header with LI=0, to make frame extend to " |
| 1072 | "next block, and we are done\n", chunk, space); |
| 1073 | /* make space for delimiter */ |
| 1074 | if (delimiter != data) |
| 1075 | memcpy(delimiter + 1, delimiter, |
| 1076 | data - delimiter); |
| 1077 | data++; |
| 1078 | space--; |
| 1079 | /* add LI with 0 length */ |
| 1080 | li = (struct rlc_li_field *)delimiter; |
| 1081 | li->e = 1; /* not more extension */ |
| 1082 | li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| 1083 | li->li = 0; /* chunk fills the complete space */ |
| 1084 | // no need to set e_pointer nor increase delimiter |
| 1085 | /* fill only space, which is 1 octet less than chunk */ |
| 1086 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1087 | /* incement index */ |
| 1088 | tbf->llc_index += space; |
| 1089 | /* return data block as message */ |
| 1090 | break; |
| 1091 | } |
| 1092 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 1093 | "than remaining space (%d): add length header to " |
| 1094 | "to delimit LLC frame\n", chunk, space); |
| 1095 | /* the LLC frame chunk ends in this block */ |
| 1096 | /* make space for delimiter */ |
| 1097 | if (delimiter != data) |
| 1098 | memcpy(delimiter + 1, delimiter, data - delimiter); |
| 1099 | data++; |
| 1100 | space--; |
| 1101 | /* add LI to delimit frame */ |
| 1102 | li = (struct rlc_li_field *)delimiter; |
| 1103 | li->e = 0; /* Extension bit, maybe set later */ |
| 1104 | li->m = 0; /* will be set later, if there is more LLC data */ |
| 1105 | li->li = chunk; /* length of chunk */ |
| 1106 | e_pointer = delimiter; /* points to E of current delimiter */ |
| 1107 | delimiter++; |
| 1108 | /* copy (rest of) LLC frame to space */ |
| 1109 | memcpy(data, tbf->llc_frame + tbf->llc_index, chunk); |
| 1110 | data += chunk; |
| 1111 | space -= chunk; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1112 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for TBF=%d: " |
| 1113 | "len=%d\n", tbf->tfi, tbf->llc_length); |
Andreas Eversberg | b3ded4c | 2012-07-24 10:47:24 +0200 | [diff] [blame] | 1114 | gprs_rlcmac_debug_bw(tbf, tbf->llc_length); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1115 | /* reset LLC frame */ |
| 1116 | tbf->llc_index = tbf->llc_length = 0; |
| 1117 | /* dequeue next LLC frame, if any */ |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1118 | msg = llc_dequeue(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1119 | if (msg) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1120 | LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC for " |
| 1121 | "TBF=%d (len=%d)\n", tbf->tfi, msg->len); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1122 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1123 | tbf->llc_length = msg->len; |
| 1124 | msgb_free(msg); |
| 1125 | } |
| 1126 | /* if we have more data and we have space left */ |
| 1127 | if (space > 0 && tbf->llc_length) { |
| 1128 | li->m = 1; /* we indicate more frames to follow */ |
| 1129 | continue; |
| 1130 | } |
| 1131 | /* if we don't have more LLC frames */ |
| 1132 | if (!tbf->llc_length) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1133 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1134 | "done.\n"); |
| 1135 | li->e = 1; /* we cannot extend */ |
| 1136 | rh->fbi = 1; /* we indicate final block */ |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1137 | tbf->dir.dl.tx_counter = POLL_ACK_AFTER_FRAMES + 1; |
| 1138 | /* + 1 indicates: first final ack */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1139 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1140 | break; |
| 1141 | } |
| 1142 | /* we have no space left */ |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1143 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1144 | "done.\n"); |
| 1145 | li->e = 1; /* we cannot extend */ |
| 1146 | break; |
| 1147 | } |
| 1148 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n", |
| 1149 | osmo_hexdump(tbf->rlc_block[index], block_length)); |
| 1150 | tbf->rlc_block_len[index] = block_length; |
| 1151 | /* raise send state and set ack state array */ |
| 1152 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 1153 | tbf->dir.dl.v_s = (tbf->dir.dl.v_s + 1) & mod_sns; /* inc send state */ |
| 1154 | |
| 1155 | tx_block: |
| 1156 | /* from this point on, new block is sent or old block is resent */ |
| 1157 | |
| 1158 | /* get data and header from current block */ |
| 1159 | data = tbf->rlc_block[index]; |
| 1160 | len = tbf->rlc_block_len[index]; |
| 1161 | rh = (struct rlc_dl_header *)data; |
| 1162 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1163 | /* Clear Polling, if still set in history buffer */ |
| 1164 | rh->s_p = 0; |
| 1165 | |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1166 | /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| 1167 | */ |
| 1168 | if (tbf->dir.dl.tx_counter >= POLL_ACK_AFTER_FRAMES) { |
| 1169 | if (tbf->dir.dl.tx_counter > POLL_ACK_AFTER_FRAMES) { |
| 1170 | /* if rx_counter is POLL_ACK_AFTER_FRAMES + 1, this |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1171 | * indicates: poll caused by final ack. */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1172 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 1173 | "polling, because final block sent.\n"); |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1174 | } else { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1175 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 1176 | "polling, because %d blocks sent.\n", |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1177 | POLL_ACK_AFTER_FRAMES); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1178 | } |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1179 | tbf->dir.dl.tx_counter = 0; |
| 1180 | /* scheduling not possible, because: */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1181 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1182 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1183 | "sheduled for TBF=%d, so we must wait for " |
| 1184 | "requesting downlink ack\n", tbf->tfi); |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1185 | else if (tbf->control_ts != ts) |
| 1186 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 1187 | "sheduled in this TS %d, waiting for " |
| 1188 | "TS %d\n", ts, tbf->control_ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1189 | else { |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1190 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling sheduled in this " |
| 1191 | "TS %d\n", ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1192 | /* start timer whenever we send the final block */ |
| 1193 | if (rh->fbi == 1) |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 1194 | tbf_timer_start(tbf, 3191, bts->t3191, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1195 | |
| 1196 | /* schedule polling */ |
| 1197 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1198 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1199 | |
| 1200 | /* set polling in header */ |
| 1201 | rh->rrbp = 0; /* N+13 */ |
| 1202 | rh->s_p = 1; /* Polling */ |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1203 | |
| 1204 | /* Increment TX-counter */ |
| 1205 | tbf->dir.dl.tx_counter++; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1206 | } |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1207 | } else { |
| 1208 | /* Increment TX-counter */ |
| 1209 | tbf->dir.dl.tx_counter++; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1210 | } |
| 1211 | |
| 1212 | /* return data block as message */ |
| 1213 | dl_msg = msgb_alloc(len, "rlcmac_dl_data"); |
| 1214 | if (!dl_msg) |
| 1215 | return NULL; |
| 1216 | memcpy(msgb_put(dl_msg, len), data, len); |
| 1217 | |
| 1218 | return dl_msg; |
| 1219 | } |
| 1220 | |
| 1221 | int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final, |
| 1222 | uint8_t ssn, uint8_t *rbb) |
| 1223 | { |
| 1224 | char show_rbb[65], show_v_b[RLC_MAX_SNS + 1]; |
| 1225 | uint16_t mod_sns = tbf->sns - 1; |
| 1226 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 1227 | int i; /* must be signed */ |
| 1228 | int16_t dist; /* must be signed */ |
| 1229 | uint8_t bit; |
| 1230 | uint16_t bsn; |
| 1231 | struct msgb *msg; |
| 1232 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1233 | LOGP(DRLCMACDL, LOGL_DEBUG, "TBF=%d downlink acknowledge\n", |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1234 | tbf->tfi); |
| 1235 | |
| 1236 | if (!final) { |
| 1237 | /* show received array in debug (bit 64..1) */ |
| 1238 | for (i = 63; i >= 0; i--) { |
| 1239 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1240 | show_rbb[i] = (bit) ? '1' : 'o'; |
| 1241 | } |
| 1242 | show_rbb[64] = '\0'; |
| 1243 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1244 | "(BSN=%d) 1=ACK o=NACK\n", (ssn - 64) & mod_sns, |
| 1245 | show_rbb, (ssn - 1) & mod_sns); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1246 | |
| 1247 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 1248 | /* calculate distance of ssn from V(S) */ |
| 1249 | dist = (tbf->dir.dl.v_s - ssn) & mod_sns; |
| 1250 | /* check if distance is less than distance V(A)..V(S) */ |
| 1251 | if (dist < ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns)) { |
| 1252 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
| 1253 | for (i = 63, bsn = (ssn - 1) & mod_sns; |
| 1254 | i >= 0 && bsn != ((tbf->dir.dl.v_a - 1) & mod_sns); |
| 1255 | i--, bsn = (bsn - 1) & mod_sns) { |
| 1256 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1257 | if (bit) { |
| 1258 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1259 | "ack for BSN=%d\n", bsn); |
| 1260 | tbf->dir.dl.v_b[bsn & mod_sns_half] |
| 1261 | = 'A'; |
| 1262 | } else { |
| 1263 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1264 | "NACK for BSN=%d\n", bsn); |
| 1265 | tbf->dir.dl.v_b[bsn & mod_sns_half] |
| 1266 | = 'N'; |
| 1267 | } |
| 1268 | } |
| 1269 | } else { |
Andreas Eversberg | 0f13c40 | 2012-07-16 11:59:23 +0200 | [diff] [blame] | 1270 | /* this might happpen, if the downlink assignment |
| 1271 | * was not received by ms and the ack refers |
| 1272 | * to previous TBF |
| 1273 | * FIXME: we should implement polling for |
| 1274 | * control ack!*/ |
| 1275 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 1276 | "V(A)..V(S) range (DL TBF=%d) Free TFB!\n", |
| 1277 | tbf->tfi); |
| 1278 | return 1; /* indicate to free TBF */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1279 | } |
| 1280 | |
| 1281 | /* raise V(A), if possible */ |
| 1282 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1283 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1284 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] == 'A') { |
| 1285 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'I'; |
| 1286 | /* mark invalid */ |
| 1287 | tbf->dir.dl.v_a = (tbf->dir.dl.v_a + 1) |
| 1288 | & mod_sns; |
| 1289 | } else |
| 1290 | break; |
| 1291 | } |
| 1292 | |
| 1293 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 1294 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1295 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1296 | show_v_b[i] = tbf->dir.dl.v_b[bsn & mod_sns_half]; |
| 1297 | if (show_v_b[i] == 0) |
| 1298 | show_v_b[i] = ' '; |
| 1299 | } |
| 1300 | show_v_b[i] = '\0'; |
| 1301 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 1302 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 1303 | "X=Resend-Unacked\n", tbf->dir.dl.v_a, show_v_b, |
| 1304 | (tbf->dir.dl.v_s - 1) & mod_sns); |
| 1305 | |
Andreas Eversberg | 6664a90 | 2012-07-15 06:52:19 +0200 | [diff] [blame] | 1306 | if (tbf->state == GPRS_RLCMAC_FINISHED |
| 1307 | && tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
| 1308 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received final block, " |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1309 | "but without final ack inidcation\n"); |
Andreas Eversberg | 6664a90 | 2012-07-15 06:52:19 +0200 | [diff] [blame] | 1310 | } else |
| 1311 | return 0; |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1312 | } else |
| 1313 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1314 | |
| 1315 | /* check for LLC PDU in the LLC Queue */ |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1316 | msg = llc_dequeue(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1317 | if (!msg) { |
| 1318 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 1319 | |
| 1320 | /* no message, start T3193, change state to RELEASE */ |
| 1321 | LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we " |
| 1322 | "release.\n"); |
Andreas Eversberg | b3c6f6c | 2012-07-06 07:40:08 +0200 | [diff] [blame] | 1323 | /* start T3193 */ |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 1324 | tbf_timer_start(tbf, 3193, bts->t3193_msec / 1000, |
| 1325 | bts->t3193_msec & 1000); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1326 | tbf_new_state(tbf, GPRS_RLCMAC_WAIT_RELEASE); |
| 1327 | |
| 1328 | return 0; |
| 1329 | } |
| 1330 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1331 | tbf->llc_length = msg->len; |
| 1332 | msgb_free(msg); |
| 1333 | |
| 1334 | /* we have a message, so we trigger downlink assignment, and there |
| 1335 | * set the state to ASSIGN. also we set old_downlink, because we |
| 1336 | * re-use this tbf. */ |
| 1337 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, " |
| 1338 | "because another LLC PDU has arrived in between\n"); |
| 1339 | memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); /* reset RLC states */ |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 1340 | tbf_update(tbf); |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1341 | gprs_rlcmac_trigger_downlink_assignment(tbf, tbf, NULL); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1342 | |
| 1343 | return 0; |
| 1344 | } |
| 1345 | |
| 1346 | |
| 1347 | struct msgb *gprs_rlcmac_send_packet_downlink_assignment( |
| 1348 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 1349 | { |
| 1350 | struct msgb *msg; |
| 1351 | struct gprs_rlcmac_tbf *new_tbf; |
| 1352 | |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1353 | #if POLLING_ASSIGNMENT == 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1354 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1355 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1356 | "sheduled for TBF=%d, so we must wait for downlink " |
| 1357 | "assignment...\n", tbf->tfi); |
| 1358 | return NULL; |
| 1359 | } |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1360 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1361 | |
| 1362 | /* on uplink TBF we get the downlink TBF to be assigned. */ |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1363 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| 1364 | /* be sure to check first, if contention resolution is done, |
| 1365 | * otherwise we cannot send the assignment yet */ |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 1366 | if (!tbf->dir.ul.contention_resolution_done) { |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1367 | LOGP(DRLCMAC, LOGL_DEBUG, "Cannot assign DL TBF now, " |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1368 | "because contention resolution is not " |
| 1369 | "finished.\n"); |
| 1370 | return NULL; |
| 1371 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1372 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF); |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1373 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1374 | new_tbf = tbf; |
| 1375 | if (!new_tbf) { |
| 1376 | LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink " |
| 1377 | "assignment at uplink TBF=%d, but there is no downlink " |
| 1378 | "TBF\n", tbf->tfi); |
| 1379 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1380 | return NULL; |
| 1381 | } |
| 1382 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1383 | LOGP(DRLCMAC, LOGL_INFO, "TBF: START TFI: %u TLLI: 0x%08x Packet Downlink Assignment (PACCH)\n", new_tbf->tfi, new_tbf->tlli); |
Andreas Eversberg | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 1384 | msg = write_packet_downlink_assignment(tbf->tfi, |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1385 | (tbf->direction == GPRS_RLCMAC_DL_TBF), new_tbf, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1386 | POLLING_ASSIGNMENT); |
Andreas Eversberg | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 1387 | if (!msg) |
| 1388 | return NULL; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1389 | |
| 1390 | #if POLLING_ASSIGNMENT == 1 |
| 1391 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1392 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1393 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; |
| 1394 | #else |
| 1395 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 1396 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 1397 | tbf_assign_control_ts(new_tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1398 | #endif |
| 1399 | |
| 1400 | return msg; |
| 1401 | } |
| 1402 | |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1403 | static void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf, uint8_t poll, |
| 1404 | char *imsi) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1405 | { |
Andreas Eversberg | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 1406 | uint8_t imm_ass[23]; |
| 1407 | int rc; |
| 1408 | |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1409 | LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u TLLI: 0x%08x Immediate Assignment Downlink (PCH)\n", tbf->tfi, tbf->tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1410 | /* use request reference that has maximum distance to current time, |
| 1411 | * so the assignment will not conflict with possible RACH requests. */ |
Andreas Eversberg | fc1dfd8 | 2012-07-26 10:50:23 +0200 | [diff] [blame^] | 1412 | rc = write_immediate_assignment_downlink(imm_ass, 125, (tbf->pdch[tbf->first_ts]->last_rts_fn + 21216) % 2715648, tbf->ta, tbf->arfcn, tbf->first_ts, tbf->tsc, tbf->tfi, tbf->tlli, poll, tbf->poll_fn); |
| 1413 | if (rc < 0) |
| 1414 | return; |
| 1415 | |
| 1416 | pcu_l1if_tx_pch(imm_ass, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1417 | } |
| 1418 | |
| 1419 | /* depending on the current TBF, we assign on PACCH or AGCH */ |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1420 | void gprs_rlcmac_trigger_downlink_assignment(struct gprs_rlcmac_tbf *tbf, |
| 1421 | struct gprs_rlcmac_tbf *old_tbf, char *imsi) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1422 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1423 | #ifdef DEBUG_DL_ASS_IDLE |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1424 | strncpy(debug_imsi, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1425 | LOGP(DRLCMAC, LOGL_ERROR, "**** DEBUGGING DOWNLINK ASSIGNMENT ****\n"); |
| 1426 | #endif |
| 1427 | |
| 1428 | /* stop pending timer */ |
| 1429 | tbf_timer_stop(tbf); |
| 1430 | |
| 1431 | /* check for downlink tbf: */ |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1432 | if (old_tbf) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1433 | #ifdef DEBUG_DL_ASS_IDLE |
| 1434 | LOGP(DRLCMAC, LOGL_ERROR, "We must wait for current TBF to be " |
| 1435 | "released.\n"); |
| 1436 | /* wait one second until assignment */ |
| 1437 | tbf_timer_start(tbf, 1234, 1,0); |
| 1438 | #else |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1439 | LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment on " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1440 | "PACCH, because %s TBF=%d exists for TLLI=0x%08x\n", |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1441 | (old_tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 1442 | ? "UL" : "DL", old_tbf->tfi, old_tbf->tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1443 | old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
| 1444 | /* use TA from old TBF */ |
| 1445 | tbf->ta = old_tbf->ta; |
| 1446 | /* change state */ |
| 1447 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1448 | #endif |
| 1449 | } else { |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1450 | LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment for TBF=%d on PCH, no TBF exist (IMSI=%s)\n", tbf->tfi, imsi); |
| 1451 | if (!imsi || strlen(imsi) < 3) { |
| 1452 | LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI!\n"); |
| 1453 | return; |
| 1454 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1455 | /* change state */ |
| 1456 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
Andreas Eversberg | 7438df7 | 2012-07-23 18:04:49 +0200 | [diff] [blame] | 1457 | /* send immediate assignment */ |
| 1458 | gprs_rlcmac_downlink_assignment(tbf, 0, imsi); |
| 1459 | /* send immediate assignment */ |
| 1460 | gprs_rlcmac_downlink_assignment(tbf, 0, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1461 | /* start timer */ |
| 1462 | tbf_timer_start(tbf, 0, Tassign_agch); |
| 1463 | } |
| 1464 | } |
| 1465 | |