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 | |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 25 | extern void *tall_pcu_ctx; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 26 | |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 27 | extern "C" { |
| 28 | int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, |
| 29 | uint8_t num_frames, uint32_t num_octets); |
| 30 | } |
| 31 | |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 32 | /* After receiving these frames, we send ack/nack. */ |
| 33 | #define SEND_ACK_AFTER_FRAMES 20 |
| 34 | |
| 35 | /* After sending these frames, we poll for ack/nack. */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 36 | #define POLL_ACK_AFTER_FRAMES 20 |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 37 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 38 | /* If acknowledgement to uplink/downlink assignmentshould be polled */ |
| 39 | #define POLLING_ASSIGNMENT_DL 1 |
| 40 | #define POLLING_ASSIGNMENT_UL 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 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 | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 76 | static void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf, uint8_t poll, |
| 77 | char *imsi); |
| 78 | |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 79 | static int gprs_rlcmac_diag(struct gprs_rlcmac_tbf *tbf) |
| 80 | { |
| 81 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) |
| 82 | LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on CCCH\n"); |
| 83 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) |
| 84 | LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on PACCH\n"); |
| 85 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_UL_DATA))) |
| 86 | LOGP(DRLCMAC, LOGL_NOTICE, "- Uplink data was received\n"); |
| 87 | else if (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 88 | LOGP(DRLCMAC, LOGL_NOTICE, "- No uplink data received yet\n"); |
| 89 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) |
| 90 | LOGP(DRLCMAC, LOGL_NOTICE, "- Downlink ACK was received\n"); |
| 91 | else if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 92 | LOGP(DRLCMAC, LOGL_NOTICE, "- No downlink ACK received yet\n"); |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 97 | int gprs_rlcmac_poll_timeout(struct gprs_rlcmac_tbf *tbf) |
| 98 | { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 99 | LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for %s TBF=%d\n", |
| 100 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 101 | |
| 102 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 103 | |
| 104 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 105 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { |
| 106 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 107 | "PACKET CONTROL ACK for PACKET UPLINK ACK\n"); |
| 108 | gprs_rlcmac_diag(tbf); |
| 109 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); |
| 110 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 111 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
| 112 | if (tbf->state == GPRS_RLCMAC_FINISHED) { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 113 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 114 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 115 | tbf->dir.ul.n3103++; |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 116 | if (tbf->dir.ul.n3103 == bts->n3103) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 117 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 118 | "- N3103 exceeded\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 119 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 120 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 121 | return 0; |
| 122 | } |
| 123 | /* reschedule UL ack */ |
| 124 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 125 | } |
| 126 | } else |
| 127 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 128 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 129 | |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 130 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| 131 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 132 | "PACKET CONTROL ACK for PACKET UPLINK " |
| 133 | "ASSIGNMENT.\n"); |
| 134 | gprs_rlcmac_diag(tbf); |
| 135 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| 136 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 137 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 138 | tbf->n3105++; |
| 139 | if (tbf->n3105 == bts->n3105) { |
| 140 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 141 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 142 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 143 | return 0; |
| 144 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 145 | /* reschedule UL assignment */ |
| 146 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 147 | } else |
| 148 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 149 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 150 | |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 151 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| 152 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 153 | "PACKET CONTROL ACK for PACKET DOWNLINK " |
| 154 | "ASSIGNMENT.\n"); |
| 155 | gprs_rlcmac_diag(tbf); |
| 156 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| 157 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 158 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 159 | tbf->n3105++; |
| 160 | if (tbf->n3105 == bts->n3105) { |
| 161 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
| 162 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
| 163 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
| 164 | return 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 165 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 166 | /* reschedule DL assignment */ |
| 167 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 168 | } else |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 169 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 170 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 171 | |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 172 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| 173 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 174 | "PACKET DOWNLINK ACK.\n"); |
| 175 | gprs_rlcmac_diag(tbf); |
| 176 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 177 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 178 | tbf->n3105++; |
| 179 | if (tbf->n3105 == bts->n3105) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 180 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 181 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
| 182 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
| 183 | return 0; |
| 184 | } |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 185 | /* resend IMM.ASS on CCCH on timeout */ |
| 186 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)) |
| 187 | && !(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) { |
| 188 | LOGP(DRLCMAC, LOGL_DEBUG, "Re-send dowlink assignment " |
| 189 | "for TBF=%d on PCH (IMSI=%s)\n", tbf->tfi, |
| 190 | tbf->dir.dl.imsi); |
| 191 | /* send immediate assignment */ |
| 192 | gprs_rlcmac_downlink_assignment(tbf, 0, tbf->dir.dl.imsi); |
| 193 | tbf->dir.dl.wait_confirm = 1; |
| 194 | } |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 195 | } else |
| 196 | LOGP(DRLCMAC, LOGL_ERROR, "- Poll Timeout, but no event!\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 197 | |
| 198 | return 0; |
| 199 | } |
| 200 | |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 201 | static uint8_t get_ms_class_by_capability(MS_Radio_Access_capability_t *cap) |
| 202 | { |
| 203 | int i; |
| 204 | |
| 205 | for (i = 0; i < cap->Count_MS_RA_capability_value; i++) { |
| 206 | if (!cap->MS_RA_capability_value[i].u.Content.Exist_Multislot_capability) |
| 207 | continue; |
| 208 | if (!cap->MS_RA_capability_value[i].u.Content.Multislot_capability.Exist_GPRS_multislot_class) |
| 209 | continue; |
| 210 | return cap->MS_RA_capability_value[i].u.Content.Multislot_capability.GPRS_multislot_class; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | return 0; |
| 214 | } |
| 215 | |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 216 | static struct gprs_rlcmac_tbf *alloc_ul_tbf(int8_t use_trx, int8_t first_ts, |
| 217 | uint8_t ms_class, uint32_t tlli, uint8_t ta, |
| 218 | struct gprs_rlcmac_tbf *dl_tbf) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 219 | { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 220 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 221 | uint8_t trx, ts; |
| 222 | struct gprs_rlcmac_tbf *tbf; |
| 223 | uint8_t tfi; |
| 224 | |
| 225 | /* create new TBF, use sme TRX as DL TBF */ |
| 226 | tfi = tfi_alloc(GPRS_RLCMAC_UL_TBF, &trx, &ts, use_trx, first_ts); |
| 227 | if (tfi < 0) { |
| 228 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 229 | /* FIXME: send reject */ |
| 230 | return NULL; |
| 231 | } |
| 232 | /* use multislot class of downlink TBF */ |
| 233 | tbf = tbf_alloc(dl_tbf, GPRS_RLCMAC_UL_TBF, tfi, trx, ts, ms_class, 0); |
| 234 | if (!tbf) { |
| 235 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 236 | /* FIXME: send reject */ |
| 237 | return NULL; |
| 238 | } |
| 239 | tbf->tlli = tlli; |
| 240 | tbf->tlli_valid = 1; /* no contention resolution */ |
| 241 | tbf->dir.ul.contention_resolution_done = 1; |
| 242 | tbf->ta = ta; /* use current TA */ |
| 243 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
| 244 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH); |
| 245 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
| 246 | |
| 247 | return tbf; |
| 248 | } |
| 249 | |
| 250 | |
| 251 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 252 | /* Received Uplink RLC control block. */ |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 253 | int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint8_t trx, uint8_t ts, |
| 254 | uint32_t fn) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 255 | { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 256 | int8_t tfi = 0; /* must be signed */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 257 | uint32_t tlli = 0; |
| 258 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | 0f13c40 | 2012-07-16 11:59:23 +0200 | [diff] [blame] | 259 | int rc; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 260 | |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 261 | RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 262 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 263 | decode_gsm_rlcmac_uplink(rlc_block, ul_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 264 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 265 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 266 | switch (ul_control_block->u.MESSAGE_TYPE) { |
| 267 | case MT_PACKET_CONTROL_ACK: |
| 268 | tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 269 | tbf = tbf_by_poll_fn(fn, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 270 | if (!tbf) { |
| 271 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 272 | "unknown FN=%u TLL=0x%08x (TRX %d TS %d)\n", |
| 273 | fn, tlli, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 274 | break; |
| 275 | } |
| 276 | tfi = tbf->tfi; |
| 277 | if (tlli != tbf->tlli) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 278 | LOGP(DRLCMAC, LOGL_INFO, "Phone changed TLLI to " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 279 | "0x%08x\n", tlli); |
| 280 | tbf->tlli = tlli; |
| 281 | } |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 282 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Control Ack\n", tbf->tfi, tbf->tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 283 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 284 | |
| 285 | /* check if this control ack belongs to packet uplink ack */ |
| 286 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 287 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 288 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 289 | if ((tbf->state_flags & |
| 290 | (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { |
| 291 | tbf->state_flags &= |
| 292 | ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); |
| 293 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " |
| 294 | "ack\n"); |
| 295 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 296 | tbf_free(tbf); |
| 297 | break; |
| 298 | } |
| 299 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 300 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] DOWNLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 301 | /* reset N3105 */ |
| 302 | tbf->n3105 = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 303 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 304 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 305 | tbf = tbf_by_tlli(tbf->tlli, |
| 306 | GPRS_RLCMAC_DL_TBF); |
| 307 | if (!tbf) { |
| 308 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL " |
| 309 | "TBF is gone\n"); |
| 310 | break; |
| 311 | } |
| 312 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 313 | /* stop pending assignment timer */ |
| 314 | tbf_timer_stop(tbf); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 315 | if ((tbf->state_flags & |
| 316 | (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| 317 | tbf->state_flags &= |
| 318 | ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| 319 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink " |
| 320 | "assignment\n"); |
| 321 | } |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 322 | tbf_assign_control_ts(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 323 | break; |
| 324 | } |
| 325 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 326 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [DOWNLINK] UPLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 327 | /* reset N3105 */ |
| 328 | tbf->n3105 = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 329 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 330 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 331 | tbf = tbf_by_tlli(tbf->tlli, |
| 332 | GPRS_RLCMAC_UL_TBF); |
| 333 | if (!tbf) { |
| 334 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL " |
| 335 | "TBF is gone\n"); |
| 336 | break; |
| 337 | } |
| 338 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 339 | if ((tbf->state_flags & |
| 340 | (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| 341 | tbf->state_flags &= |
| 342 | ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| 343 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " |
| 344 | "assignment\n"); |
| 345 | } |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 346 | tbf_assign_control_ts(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 347 | break; |
| 348 | } |
| 349 | LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK " |
| 350 | "at no request\n"); |
| 351 | break; |
| 352 | case MT_PACKET_DOWNLINK_ACK_NACK: |
| 353 | tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 354 | tbf = tbf_by_poll_fn(fn, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 355 | if (!tbf) { |
| 356 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 357 | "unknown FN=%u TBF=%d (TRX %d TS %d)\n", |
| 358 | fn, tfi, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 359 | break; |
| 360 | } |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 361 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK); |
| 362 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| 363 | tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 364 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink ack\n"); |
| 365 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 366 | /* reset N3105 */ |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 367 | tbf->n3105 = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 368 | /* stop timer T3191 */ |
| 369 | tbf_timer_stop(tbf); |
| 370 | tlli = tbf->tlli; |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 371 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 372 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 373 | |
Andreas Eversberg | 0f13c40 | 2012-07-16 11:59:23 +0200 | [diff] [blame] | 374 | rc = gprs_rlcmac_downlink_ack(tbf, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 375 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.FINAL_ACK_INDICATION, |
| 376 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER, |
| 377 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP); |
Andreas Eversberg | 0f13c40 | 2012-07-16 11:59:23 +0200 | [diff] [blame] | 378 | if (rc == 1) { |
| 379 | tbf_free(tbf); |
| 380 | break; |
| 381 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 382 | /* check for channel request */ |
| 383 | if (ul_control_block->u.Packet_Downlink_Ack_Nack.Exist_Channel_Request_Description) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 384 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack " |
| 385 | "message, so we provide one:\n"); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 386 | alloc_ul_tbf(tbf->trx, tbf->first_ts, tbf->ms_class, tbf->tlli, tbf->ta, tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 387 | /* schedule uplink assignment */ |
| 388 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
| 389 | } |
| 390 | break; |
| 391 | case MT_PACKET_RESOURCE_REQUEST: |
| 392 | if (ul_control_block->u.Packet_Resource_Request.ID.UnionType) { |
| 393 | tlli = ul_control_block->u.Packet_Resource_Request.ID.u.TLLI; |
| 394 | tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | 99a107d | 2012-09-27 09:21:52 +0200 | [diff] [blame] | 395 | if (tbf) { |
| 396 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 397 | "TLLI=0x%08x while UL TBF=%d still " |
| 398 | "exists. Killing pending DL TBF\n", |
| 399 | tlli, tbf->tfi); |
| 400 | tbf_free(tbf); |
| 401 | tbf = NULL; |
| 402 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 403 | if (!tbf) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 404 | uint8_t ms_class = 0; |
Andreas Eversberg | 99a107d | 2012-09-27 09:21:52 +0200 | [diff] [blame] | 405 | struct gprs_rlcmac_tbf *dl_tbf; |
| 406 | |
| 407 | if ((dl_tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF))) { |
| 408 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 409 | "TLLI=0x%08x while DL TBF=%d still exists. " |
| 410 | "Killing pending DL TBF\n", tlli, |
| 411 | dl_tbf->tfi); |
| 412 | tbf_free(dl_tbf); |
| 413 | } |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 414 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF " |
| 415 | "in packet ressource request of single " |
| 416 | "block, so we provide one:\n"); |
| 417 | if (ul_control_block->u.Packet_Resource_Request.Exist_MS_Radio_Access_capability) |
| 418 | ms_class = get_ms_class_by_capability(&ul_control_block->u.Packet_Resource_Request.MS_Radio_Access_capability); |
| 419 | if (!ms_class) |
| 420 | LOGP(DRLCMAC, LOGL_NOTICE, "MS does not give us a class.\n"); |
| 421 | tbf = alloc_ul_tbf(trx, ts, ms_class, tlli, 0, NULL); |
| 422 | #warning FIXME TA!!! |
| 423 | if (!tbf) |
| 424 | break; |
| 425 | /* set control ts to current MS's TS, until assignment complete */ |
| 426 | LOGP(DRLCMAC, LOGL_DEBUG, "Change control TS to %d until assinment is complete.\n", ts); |
| 427 | tbf->control_ts = ts; |
| 428 | /* schedule uplink assignment */ |
| 429 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 430 | break; |
| 431 | } |
| 432 | tfi = tbf->tfi; |
| 433 | } else { |
| 434 | if (ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.UnionType) { |
| 435 | tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.DOWNLINK_TFI; |
Andreas Eversberg | adb2f18 | 2012-08-07 17:06:08 +0200 | [diff] [blame] | 436 | tbf = tbf_by_tfi(tfi, trx, GPRS_RLCMAC_DL_TBF); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 437 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 438 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown downlink TBF=%d\n", tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 439 | break; |
| 440 | } |
| 441 | } else { |
| 442 | tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.UPLINK_TFI; |
Andreas Eversberg | adb2f18 | 2012-08-07 17:06:08 +0200 | [diff] [blame] | 443 | tbf = tbf_by_tfi(tfi, trx, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 444 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 445 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TBF=%d\n", tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 446 | break; |
| 447 | } |
| 448 | } |
| 449 | tlli = tbf->tlli; |
| 450 | } |
Andreas Eversberg | c8466f4 | 2012-07-15 19:34:53 +0200 | [diff] [blame] | 451 | LOGP(DRLCMAC, LOGL_ERROR, "RX: [PCU <- BTS] %s TFI: %u TLLI: 0x%08x FIXME: Packet ressource request\n", (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, tbf->tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 452 | break; |
| 453 | default: |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 454 | LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] unknown control block received\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 455 | } |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 456 | talloc_free(ul_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 457 | return 1; |
| 458 | } |
| 459 | |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 460 | #ifdef DEBUG_DL_ASS_IDLE |
| 461 | char debug_imsi[16]; |
| 462 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 463 | |
| 464 | void tbf_timer_cb(void *_tbf) |
| 465 | { |
| 466 | struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf; |
| 467 | |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 468 | LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d timer %u expired.\n", |
| 469 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 470 | tbf->T); |
| 471 | |
| 472 | tbf->num_T_exp++; |
| 473 | |
| 474 | switch (tbf->T) { |
| 475 | #ifdef DEBUG_DL_ASS_IDLE |
| 476 | case 1234: |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 477 | gprs_rlcmac_trigger_downlink_assignment(tbf, NULL, debug_imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 478 | break; |
| 479 | #endif |
| 480 | case 0: /* assignment */ |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 481 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) { |
| 482 | if (tbf->state == GPRS_RLCMAC_ASSIGN) { |
| 483 | LOGP(DRLCMAC, LOGL_NOTICE, "Releasing due to " |
| 484 | "PACCH assignment timeout.\n"); |
| 485 | tbf_free(tbf); |
| 486 | } else |
| 487 | LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not " |
| 488 | "in assign state\n"); |
| 489 | } |
| 490 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) { |
| 491 | /* change state to FLOW, so scheduler will start transmission */ |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 492 | tbf->dir.dl.wait_confirm = 0; |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 493 | if (tbf->state == GPRS_RLCMAC_ASSIGN) { |
| 494 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 495 | tbf_assign_control_ts(tbf); |
| 496 | } else |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 497 | LOGP(DRLCMAC, LOGL_NOTICE, "Continue flow after " |
| 498 | "IMM.ASS confirm\n"); |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 499 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 500 | break; |
| 501 | case 3169: |
| 502 | case 3191: |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 503 | case 3195: |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 504 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF T%d timeout during " |
| 505 | "transsmission\n", tbf->T); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 506 | gprs_rlcmac_diag(tbf); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 507 | /* fall through */ |
| 508 | case 3193: |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 509 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n"); |
| 510 | /* free TBF */ |
| 511 | tbf_free(tbf); |
| 512 | break; |
| 513 | default: |
| 514 | LOGP(DRLCMAC, LOGL_ERROR, "Timer expired in unknown mode: %u\n", |
| 515 | tbf->T); |
| 516 | } |
| 517 | } |
| 518 | |
| 519 | /* |
| 520 | * UL data block flow |
| 521 | */ |
| 522 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 523 | /* get TLLI from received UL data block */ |
| 524 | static int tlli_from_ul_data(uint8_t *data, uint8_t len, uint32_t *tlli) |
| 525 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 526 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 527 | struct rlc_li_field *li; |
| 528 | uint8_t e; |
| 529 | |
| 530 | if (!rh->ti) |
| 531 | return -EINVAL; |
| 532 | |
| 533 | data += 3; |
| 534 | len -= 3; |
| 535 | e = rh->e; |
| 536 | /* if E is not set (LI follows) */ |
| 537 | while (!e) { |
| 538 | if (!len) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 539 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA LI extended, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 540 | "but no more data\n"); |
| 541 | return -EINVAL; |
| 542 | } |
| 543 | /* get new E */ |
| 544 | li = (struct rlc_li_field *)data; |
| 545 | if (li->e == 0) /* if LI==0, E is interpreted as '1' */ |
| 546 | e = 1; |
| 547 | else |
| 548 | e = li->e; |
| 549 | data++; |
| 550 | len--; |
| 551 | } |
| 552 | if (len < 4) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 553 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of frame " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 554 | "border\n"); |
| 555 | return -EINVAL; |
| 556 | } |
| 557 | *tlli = ntohl(*((uint32_t *)data)); |
| 558 | |
| 559 | return 0; |
| 560 | } |
| 561 | |
| 562 | /* Store received block data in LLC message(s) and forward to SGSN if complete. |
| 563 | */ |
| 564 | static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data, |
| 565 | uint8_t len) |
| 566 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 567 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 568 | uint8_t e, m; |
| 569 | struct rlc_li_field *li; |
| 570 | uint8_t frame_offset[16], offset = 0, chunk; |
| 571 | int i, frames = 0; |
| 572 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 573 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 574 | |
| 575 | data += 3; |
| 576 | len -= 3; |
| 577 | e = rh->e; /* if extended */ |
| 578 | m = 1; /* more frames, that means: the first frame */ |
| 579 | |
| 580 | /* Parse frame offsets from length indicator(s), if any. */ |
| 581 | while (1) { |
| 582 | if (frames == (int)sizeof(frame_offset)) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 583 | LOGP(DRLCMACUL, LOGL_ERROR, "Too many frames in " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 584 | "block\n"); |
| 585 | return -EINVAL; |
| 586 | } |
| 587 | frame_offset[frames++] = offset; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 588 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 589 | "%d\n", frames, offset); |
| 590 | if (!len) |
| 591 | break; |
| 592 | /* M == 0 and E == 0 is not allowed in this version. */ |
| 593 | if (!m && !e) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 594 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 595 | "ignored, because M='0' and E='0'.\n", |
| 596 | tbf->tfi); |
| 597 | return 0; |
| 598 | } |
| 599 | /* no more frames in this segment */ |
| 600 | if (e) { |
| 601 | break; |
| 602 | } |
| 603 | /* There is a new frame and an LI that delimits it. */ |
| 604 | if (m) { |
| 605 | li = (struct rlc_li_field *)data; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 606 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n", |
| 607 | li->li); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 608 | /* Special case: LI == 0 |
| 609 | * If the last segment would fit precisely into the |
| 610 | * rest of the RLC MAC block, there would be no way |
| 611 | * to delimit that this segment ends and is not |
| 612 | * continued in the next block. |
| 613 | * The special LI (0) is used to force the segment to |
| 614 | * extend into the next block, so it is delimited there. |
| 615 | * This LI must be skipped. Also it is the last LI. |
| 616 | */ |
| 617 | if (li->li == 0) { |
| 618 | data++; |
| 619 | len--; |
| 620 | m = 1; /* M is ignored, we know there is more */ |
| 621 | break; /* handle E as '1', so we break! */ |
| 622 | } |
| 623 | e = li->e; |
| 624 | m = li->m; |
| 625 | offset += li->li; |
| 626 | data++; |
| 627 | len--; |
| 628 | continue; |
| 629 | } |
| 630 | } |
| 631 | if (!m) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 632 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 633 | "data\n"); |
| 634 | } |
| 635 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 636 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 637 | len); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 638 | /* TLLI */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 639 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 640 | if (len < 4) { |
| 641 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of " |
| 642 | "frame border\n"); |
| 643 | return -EINVAL; |
| 644 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 645 | data += 4; |
| 646 | len -= 4; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 647 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: " |
| 648 | "%d\n", len); |
| 649 | } |
| 650 | |
| 651 | /* PFI */ |
| 652 | if (rh->pi) { |
| 653 | LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, " |
| 654 | "please disable in SYSTEM INFORMATION\n"); |
| 655 | if (len < 1) { |
| 656 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA PFI out of " |
| 657 | "frame border\n"); |
| 658 | return -EINVAL; |
| 659 | } |
| 660 | data++; |
| 661 | len--; |
| 662 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 663 | "%d\n", len); |
| 664 | } |
| 665 | |
| 666 | /* Now we have: |
| 667 | * - a list of frames offsets: frame_offset[] |
| 668 | * - number of frames: i |
| 669 | * - m == 0: Last frame carries spare data (end of TBF). |
| 670 | */ |
| 671 | |
| 672 | /* Check if last offset would exceed frame. */ |
| 673 | if (offset > len) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 674 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d ignored, " |
| 675 | "because LI delimits data that exceeds block size.\n", |
| 676 | tbf->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 677 | return -EINVAL; |
| 678 | } |
| 679 | |
| 680 | /* create LLC frames */ |
| 681 | for (i = 0; i < frames; i++) { |
| 682 | /* last frame ? */ |
| 683 | if (i == frames - 1) { |
| 684 | /* no more data in last frame */ |
| 685 | if (!m) |
| 686 | break; |
| 687 | /* data until end of frame */ |
| 688 | chunk = len - frame_offset[i]; |
| 689 | } else { |
| 690 | /* data until next frame */ |
| 691 | chunk = frame_offset[i + 1] - frame_offset[i]; |
| 692 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 693 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 694 | "frame at %d.\n", chunk, tbf->llc_index); |
| 695 | if (tbf->llc_index + chunk > LLC_MAX_LEN) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 696 | LOGP(DRLCMACUL, LOGL_NOTICE, "LLC frame exceeds " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 697 | "maximum size.\n"); |
| 698 | chunk = LLC_MAX_LEN - tbf->llc_index; |
| 699 | } |
| 700 | memcpy(tbf->llc_frame + tbf->llc_index, data + frame_offset[i], |
| 701 | chunk); |
| 702 | tbf->llc_index += chunk; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 703 | /* not last frame. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 704 | if (i != frames - 1) { |
| 705 | /* send frame to SGSN */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 706 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 707 | "TBF=%d: len=%d\n", tbf->tfi, tbf->llc_index); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 708 | gprs_rlcmac_tx_ul_ud(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 709 | tbf->llc_index = 0; /* reset frame space */ |
| 710 | /* also check if CV==0, because the frame may fill up the |
| 711 | * block precisely, then it is also complete. normally the |
| 712 | * frame would be extended into the next block with a 0-length |
| 713 | * delimiter added to this block. */ |
| 714 | } else if (rh->cv == 0) { |
| 715 | /* send frame to SGSN */ |
| 716 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 717 | "TBF=%d that fits precisely in last block: " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 718 | "len=%d\n", tbf->tfi, tbf->llc_index); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 719 | gprs_rlcmac_tx_ul_ud(tbf); |
| 720 | tbf->llc_index = 0; /* reset frame space */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 721 | } |
| 722 | } |
| 723 | |
| 724 | return 0; |
| 725 | } |
| 726 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 727 | struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_tbf *tbf, |
| 728 | uint32_t fn) |
| 729 | { |
| 730 | int final = (tbf->state == GPRS_RLCMAC_FINISHED); |
| 731 | struct msgb *msg; |
| 732 | |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 733 | if (final) { |
| 734 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 735 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 736 | "sheduled for TBF=%d, so we must wait for " |
| 737 | "final uplink ack...\n", tbf->tfi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 738 | return NULL; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 739 | } |
| 740 | if (sba_find(tbf->trx, tbf->control_ts, (fn + 13) % 2715648)) { |
| 741 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 742 | "scheduled for single block allocation...\n"); |
| 743 | return NULL; |
| 744 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 745 | } |
| 746 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 747 | msg = msgb_alloc(23, "rlcmac_ul_ack"); |
| 748 | if (!msg) |
| 749 | return NULL; |
| 750 | bitvec *ack_vec = bitvec_alloc(23); |
| 751 | if (!ack_vec) { |
| 752 | msgb_free(msg); |
| 753 | return NULL; |
| 754 | } |
| 755 | bitvec_unhex(ack_vec, |
| 756 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 757 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 758 | write_packet_uplink_ack(mac_control_block, tbf, final); |
| 759 | encode_gsm_rlcmac_downlink(ack_vec, mac_control_block); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 760 | bitvec_pack(ack_vec, msgb_put(msg, 23)); |
| 761 | bitvec_free(ack_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 762 | talloc_free(mac_control_block); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 763 | |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 764 | /* now we must set this flag, so we are allowed to assign downlink |
| 765 | * TBF on PACCH. it is only allowed when TLLI is aknowledged. */ |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 766 | tbf->dir.ul.contention_resolution_done = 1; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 767 | |
| 768 | if (final) { |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 769 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 770 | tbf->poll_fn = (fn + 13) % 2715648; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 771 | /* waiting for final acknowledge */ |
| 772 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK; |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 773 | tbf->dir.ul.final_ack_sent = 1; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 774 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 775 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 776 | |
| 777 | return msg; |
| 778 | } |
| 779 | |
| 780 | /* receive UL data block |
| 781 | * |
| 782 | * The blocks are defragmented and forwarded as LLC frames, if complete. |
| 783 | */ |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 784 | int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t trx, uint8_t ts, |
| 785 | uint8_t *data, uint8_t len) |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 786 | { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 787 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 788 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 789 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 790 | uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index; |
| 791 | int rc; |
| 792 | |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 793 | switch (len) { |
| 794 | case 54: |
| 795 | /* omitting spare bits */ |
| 796 | len = 53; |
| 797 | break; |
| 798 | case 40: |
| 799 | /* omitting spare bits */ |
| 800 | len = 39; |
| 801 | break; |
| 802 | case 34: |
| 803 | /* omitting spare bits */ |
| 804 | len = 33; |
| 805 | break; |
| 806 | case 23: |
| 807 | break; |
| 808 | default: |
| 809 | LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid" |
| 810 | "length: %d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 811 | return -EINVAL; |
| 812 | } |
| 813 | |
| 814 | /* find TBF inst from given TFI */ |
Andreas Eversberg | adb2f18 | 2012-08-07 17:06:08 +0200 | [diff] [blame] | 815 | tbf = tbf_by_tfi(rh->tfi, trx, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 816 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 817 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TBF=%d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 818 | rh->tfi); |
| 819 | return 0; |
| 820 | } |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 821 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_UL_DATA); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 822 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 823 | LOGP(DRLCMACUL, LOGL_DEBUG, "UL DATA TBF=%d received (V(Q)=%d .. " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 824 | "V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r); |
| 825 | |
| 826 | /* get TLLI */ |
| 827 | if (!tbf->tlli_valid) { |
Andreas Eversberg | bc65586 | 2012-07-23 18:13:31 +0200 | [diff] [blame] | 828 | struct gprs_rlcmac_tbf *dl_tbf; |
| 829 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 830 | /* no TLLI yet */ |
| 831 | if (!rh->ti) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 832 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d without " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 833 | "TLLI, but no TLLI received yet\n", rh->tfi); |
| 834 | return 0; |
| 835 | } |
| 836 | rc = tlli_from_ul_data(data, len, &tbf->tlli); |
| 837 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 838 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 839 | "of UL DATA TBF=%d.\n", rh->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 840 | return 0; |
| 841 | } |
| 842 | tbf->tlli_valid = 1; |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 843 | LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of " |
| 844 | "UL DATA TBF=%d.\n", tbf->tlli, rh->tfi); |
Andreas Eversberg | bc65586 | 2012-07-23 18:13:31 +0200 | [diff] [blame] | 845 | if ((dl_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF))) { |
| 846 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 847 | "TLLI=0x%08x while DL TBF=%d still exists. " |
| 848 | "Killing pending DL TBF\n", tbf->tlli, |
| 849 | dl_tbf->tfi); |
| 850 | tbf_free(dl_tbf); |
| 851 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 852 | /* already have TLLI, but we stille get another one */ |
| 853 | } else if (rh->ti) { |
| 854 | uint32_t tlli; |
| 855 | rc = tlli_from_ul_data(data, len, &tlli); |
| 856 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 857 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 858 | "of UL DATA TBF=%d.\n", rh->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 859 | return 0; |
| 860 | } |
| 861 | if (tlli != tbf->tlli) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 862 | LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 863 | "DATA TBF=%d. (Ignoring due to contention " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 864 | "resolution)\n", rh->tfi); |
| 865 | return 0; |
| 866 | } |
| 867 | } |
| 868 | |
| 869 | mod_sns = tbf->sns - 1; |
| 870 | mod_sns_half = (tbf->sns >> 1) - 1; |
| 871 | |
| 872 | /* restart T3169 */ |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 873 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 874 | |
| 875 | /* Increment RX-counter */ |
| 876 | tbf->dir.ul.rx_counter++; |
| 877 | |
| 878 | /* current block relative to lowest unreceived block */ |
| 879 | offset_v_q = (rh->bsn - tbf->dir.ul.v_q) & mod_sns; |
| 880 | /* If out of window (may happen if blocks below V(Q) are received |
| 881 | * again. */ |
| 882 | if (offset_v_q >= tbf->ws) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 883 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 884 | "%d..%d (it's normal)\n", rh->bsn, tbf->dir.ul.v_q, |
| 885 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 886 | return 0; |
| 887 | } |
| 888 | /* Write block to buffer and set receive state array. */ |
| 889 | index = rh->bsn & mod_sns_half; /* memory index of block */ |
| 890 | memcpy(tbf->rlc_block[index], data, len); /* Copy block. */ |
| 891 | tbf->rlc_block_len[index] = len; |
| 892 | tbf->dir.ul.v_n[index] = 'R'; /* Mark received block. */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 893 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 894 | rh->bsn, tbf->dir.ul.v_q, |
| 895 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 896 | /* Raise V(R) to highest received sequence number not received. */ |
| 897 | offset_v_r = (rh->bsn + 1 - tbf->dir.ul.v_r) & mod_sns; |
| 898 | if (offset_v_r < (tbf->sns >> 1)) { /* Positive offset, so raise. */ |
| 899 | while (offset_v_r--) { |
| 900 | if (offset_v_r) /* all except the received block */ |
| 901 | tbf->dir.ul.v_n[tbf->dir.ul.v_r & mod_sns_half] |
| 902 | = 'N'; /* Mark block as not received */ |
| 903 | tbf->dir.ul.v_r = (tbf->dir.ul.v_r + 1) & mod_sns; |
| 904 | /* Inc V(R). */ |
| 905 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 906 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 907 | tbf->dir.ul.v_r); |
| 908 | } |
| 909 | |
| 910 | /* Raise V(Q) if possible, and retrieve LLC frames from blocks. |
| 911 | * This is looped until there is a gap (non received block) or |
| 912 | * the window is empty.*/ |
| 913 | while (tbf->dir.ul.v_q != tbf->dir.ul.v_r && tbf->dir.ul.v_n[ |
| 914 | (index = tbf->dir.ul.v_q & mod_sns_half)] == 'R') { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 915 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 916 | "V(Q) to %d\n", tbf->dir.ul.v_q, |
| 917 | (tbf->dir.ul.v_q + 1) & mod_sns); |
| 918 | /* get LLC data from block */ |
| 919 | gprs_rlcmac_assemble_llc(tbf, tbf->rlc_block[index], |
| 920 | tbf->rlc_block_len[index]); |
| 921 | /* raise V(Q), because block already received */ |
| 922 | tbf->dir.ul.v_q = (tbf->dir.ul.v_q + 1) & mod_sns; |
| 923 | } |
| 924 | |
| 925 | /* Check CV of last frame in buffer */ |
| 926 | if (tbf->state == GPRS_RLCMAC_FLOW /* still in flow state */ |
| 927 | && tbf->dir.ul.v_q == tbf->dir.ul.v_r) { /* if complete */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 928 | struct rlc_ul_header *last_rh = (struct rlc_ul_header *) |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 929 | tbf->rlc_block[(tbf->dir.ul.v_r - 1) & mod_sns_half]; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 930 | LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 931 | "last block: BSN=%d CV=%d\n", last_rh->bsn, |
| 932 | last_rh->cv); |
| 933 | if (last_rh->cv == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 934 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 935 | "TBF\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 936 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 937 | /* Reset N3103 counter. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 938 | tbf->dir.ul.n3103 = 0; |
| 939 | } |
| 940 | } |
| 941 | |
| 942 | /* If TLLI is included or if we received half of the window, we send |
| 943 | * an ack/nack */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 944 | if (rh->si || rh->ti || tbf->state == GPRS_RLCMAC_FINISHED |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 945 | || (tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 946 | if (rh->si) { |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 947 | LOGP(DRLCMACUL, LOGL_NOTICE, "- Scheduling Ack/Nack, " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 948 | "because MS is stalled.\n"); |
| 949 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 950 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 951 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 952 | "because TLLI is included.\n"); |
| 953 | } |
| 954 | if (tbf->state == GPRS_RLCMAC_FINISHED) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 955 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 956 | "because last block has CV==0.\n"); |
| 957 | } |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 958 | if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 959 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 960 | "because %d frames received.\n", |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 961 | SEND_ACK_AFTER_FRAMES); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 962 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 963 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) { |
| 964 | /* trigger sending at next RTS */ |
| 965 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 966 | } else { |
| 967 | /* already triggered */ |
| 968 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Sending Ack/Nack is " |
| 969 | "already triggered, don't schedule!\n"); |
| 970 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 971 | } |
| 972 | |
| 973 | return 0; |
| 974 | } |
| 975 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 976 | struct msgb *gprs_rlcmac_send_packet_uplink_assignment( |
| 977 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 978 | { |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 979 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 980 | struct msgb *msg; |
| 981 | struct gprs_rlcmac_tbf *new_tbf; |
| 982 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 983 | #if POLLING_ASSIGNMENT_UL == 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 984 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 985 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 986 | "sheduled for TBF=%d, so we must wait for uplink " |
| 987 | "assignment...\n", tbf->tfi); |
| 988 | return NULL; |
| 989 | } |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 990 | if (sba_find(tbf->trx, tbf->control_ts, (fn + 13) % 2715648)) { |
| 991 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already scheduled for " |
| 992 | "single block allocation...\n"); |
| 993 | return NULL; |
| 994 | } |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 995 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 996 | |
| 997 | /* on down TBF we get the uplink TBF to be assigned. */ |
| 998 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 999 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); |
| 1000 | else |
| 1001 | new_tbf = tbf; |
| 1002 | |
| 1003 | if (!new_tbf) { |
| 1004 | LOGP(DRLCMACUL, LOGL_ERROR, "We have a schedule for uplink " |
| 1005 | "assignment at downlink TBF=%d, but there is no uplink " |
| 1006 | "TBF\n", tbf->tfi); |
| 1007 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 1008 | return NULL; |
| 1009 | } |
| 1010 | |
| 1011 | msg = msgb_alloc(23, "rlcmac_ul_ass"); |
| 1012 | if (!msg) |
| 1013 | return NULL; |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1014 | LOGP(DRLCMAC, LOGL_INFO, "TBF: START TFI: %u TLLI: 0x%08x Packet Uplink Assignment (PACCH)\n", new_tbf->tfi, new_tbf->tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1015 | bitvec *ass_vec = bitvec_alloc(23); |
| 1016 | if (!ass_vec) { |
| 1017 | msgb_free(msg); |
| 1018 | return NULL; |
| 1019 | } |
| 1020 | bitvec_unhex(ass_vec, |
| 1021 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 1022 | write_packet_uplink_assignment(ass_vec, tbf->tfi, |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1023 | (tbf->direction == GPRS_RLCMAC_DL_TBF), tbf->tlli, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1024 | tbf->tlli_valid, new_tbf, POLLING_ASSIGNMENT_UL, bts->alpha, |
| 1025 | bts->gamma); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1026 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1027 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1028 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Uplink Assignment +++++++++++++++++++++++++\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1029 | decode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1030 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 1031 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Uplink Assignment -------------------------\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1032 | bitvec_free(ass_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1033 | talloc_free(mac_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1034 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1035 | #if POLLING_ASSIGNMENT_UL == 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1036 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1037 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1038 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK; |
| 1039 | #else |
| 1040 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 1041 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 1042 | tbf_assign_control_ts(new_tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1043 | #endif |
| 1044 | |
| 1045 | return msg; |
| 1046 | } |
| 1047 | |
| 1048 | int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta) |
| 1049 | { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 1050 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1051 | struct gprs_rlcmac_tbf *tbf; |
| 1052 | uint8_t trx, ts; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1053 | int8_t tfi; /* must be signed */ |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1054 | uint8_t sb = 0; |
| 1055 | uint32_t sb_fn = 0; |
| 1056 | int rc; |
| 1057 | uint8_t plen; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1058 | |
| 1059 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide " |
| 1060 | "one:\n"); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1061 | if ((ra & 0xf8) == 0x70) { |
| 1062 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block " |
| 1063 | "allocation\n"); |
| 1064 | sb = 1; |
| 1065 | } else if (bts->force_two_phase) { |
| 1066 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single phase access, " |
| 1067 | "but we force two phase access\n"); |
| 1068 | sb = 1; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1069 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1070 | if (qta < 0) |
| 1071 | qta = 0; |
| 1072 | if (qta > 252) |
| 1073 | qta = 252; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1074 | if (sb) { |
| 1075 | rc = sba_alloc(&trx, &ts, &sb_fn, qta >> 2); |
| 1076 | if (rc < 0) |
| 1077 | return rc; |
| 1078 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] RACH qbit-ta=%d " |
| 1079 | "ra=0x%02x, Fn=%d (%d,%d,%d)\n", qta, ra, Fn, |
| 1080 | (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); |
| 1081 | LOGP(DRLCMAC, LOGL_INFO, "TX: Immediate Assignment Uplink " |
| 1082 | "(AGCH)\n"); |
| 1083 | } else { |
| 1084 | // Create new TBF |
| 1085 | tfi = tfi_alloc(GPRS_RLCMAC_UL_TBF, &trx, &ts, -1, -1); |
| 1086 | if (tfi < 0) { |
| 1087 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 1088 | /* FIXME: send reject */ |
| 1089 | return -EBUSY; |
| 1090 | } |
| 1091 | /* set class to 0, since we don't know the multislot class yet */ |
| 1092 | tbf = tbf_alloc(NULL, GPRS_RLCMAC_UL_TBF, tfi, trx, ts, 0, 1); |
| 1093 | if (!tbf) { |
| 1094 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 1095 | /* FIXME: send reject */ |
| 1096 | return -EBUSY; |
| 1097 | } |
| 1098 | tbf->ta = qta >> 2; |
| 1099 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 1100 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH); |
| 1101 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
| 1102 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] START TFI: %u\n", |
| 1103 | tbf->tfi); |
| 1104 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u RACH " |
| 1105 | "qbit-ta=%d ra=0x%02x, Fn=%d (%d,%d,%d)\n", tbf->tfi, |
| 1106 | qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); |
| 1107 | LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u Immediate " |
| 1108 | "Assignment Uplink (AGCH)\n", tbf->tfi); |
| 1109 | } |
Andreas Eversberg | 7b04501 | 2012-07-05 07:38:49 +0200 | [diff] [blame] | 1110 | bitvec *immediate_assignment = bitvec_alloc(22) /* without plen */; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1111 | bitvec_unhex(immediate_assignment, |
| 1112 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 1113 | if (sb) |
| 1114 | plen = write_immediate_assignment(immediate_assignment, 0, ra, |
| 1115 | Fn, qta >> 2, bts->trx[trx].arfcn, ts, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1116 | bts->trx[trx].pdch[ts].tsc, 0, 0, 0, 0, sb_fn, 1, |
| 1117 | bts->alpha, bts->gamma); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1118 | else |
| 1119 | plen = write_immediate_assignment(immediate_assignment, 0, ra, |
| 1120 | Fn, tbf->ta, tbf->arfcn, tbf->first_ts, tbf->tsc, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1121 | tbf->tfi, tbf->dir.ul.usf[tbf->first_ts], 0, 0, 0, 0, |
| 1122 | bts->alpha, bts->gamma); |
Andreas Eversberg | 7b04501 | 2012-07-05 07:38:49 +0200 | [diff] [blame] | 1123 | pcu_l1if_tx_agch(immediate_assignment, plen); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1124 | bitvec_free(immediate_assignment); |
| 1125 | |
| 1126 | return 0; |
| 1127 | } |
| 1128 | |
| 1129 | |
| 1130 | /* |
| 1131 | * DL data block flow |
| 1132 | */ |
| 1133 | |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1134 | static struct msgb *llc_dequeue(struct gprs_rlcmac_tbf *tbf) |
| 1135 | { |
| 1136 | struct msgb *msg; |
| 1137 | struct timeval *tv, tv_now; |
| 1138 | uint32_t octets = 0, frames = 0; |
| 1139 | |
| 1140 | gettimeofday(&tv_now, NULL); |
| 1141 | |
| 1142 | while ((msg = msgb_dequeue(&tbf->llc_queue))) { |
| 1143 | tv = (struct timeval *)msg->data; |
| 1144 | msgb_pull(msg, sizeof(*tv)); |
| 1145 | if (tv->tv_sec /* not infinite */ |
| 1146 | && (tv_now.tv_sec > tv->tv_sec /* and secs expired */ |
| 1147 | || (tv_now.tv_sec == tv->tv_sec /* .. or if secs equal .. */ |
| 1148 | && tv_now.tv_usec > tv->tv_usec))) { /* .. usecs expired */ |
| 1149 | LOGP(DRLCMACDL, LOGL_NOTICE, "Discarding LLC PDU of " |
| 1150 | "DL TBF=%d, because lifetime limit reached\n", |
| 1151 | tbf->tfi); |
| 1152 | frames++; |
| 1153 | octets += msg->len; |
| 1154 | msgb_free(msg); |
| 1155 | continue; |
| 1156 | } |
| 1157 | break; |
| 1158 | } |
| 1159 | |
| 1160 | if (frames) { |
| 1161 | if (frames > 0xff) |
| 1162 | frames = 0xff; |
| 1163 | if (octets > 0xffffff) |
| 1164 | octets = 0xffffff; |
| 1165 | bssgp_tx_llc_discarded(bctx, tbf->tlli, frames, octets); |
| 1166 | } |
| 1167 | |
| 1168 | return msg; |
| 1169 | } |
| 1170 | |
Andreas Eversberg | b3ded4c | 2012-07-24 10:47:24 +0200 | [diff] [blame] | 1171 | static int gprs_rlcmac_debug_bw(struct gprs_rlcmac_tbf *tbf, uint16_t octets) |
| 1172 | { |
| 1173 | struct timeval now_tv, *bw_tv = &tbf->bw_tv; |
| 1174 | uint32_t elapsed; |
| 1175 | |
| 1176 | tbf->bw_octets += octets; |
| 1177 | |
| 1178 | gettimeofday(&now_tv, NULL); |
| 1179 | elapsed = ((now_tv.tv_sec - bw_tv->tv_sec) << 7) |
| 1180 | + ((now_tv.tv_usec - bw_tv->tv_usec) << 7) / 1000000; |
| 1181 | if (elapsed < 128) |
| 1182 | return 0; |
| 1183 | |
| 1184 | LOGP(DRLCMACBW, LOGL_DEBUG, "DL Bandwitdh of TLLI=0x%08x: %d KBits/s\n", |
| 1185 | tbf->tlli, tbf->bw_octets / elapsed); |
| 1186 | |
| 1187 | /* reset bandwidth values timestamp */ |
| 1188 | memcpy(bw_tv, &now_tv, sizeof(struct timeval)); |
| 1189 | tbf->bw_octets = 0; |
| 1190 | |
| 1191 | return 0; |
| 1192 | } |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1193 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1194 | /* send DL data block |
| 1195 | * |
| 1196 | * The messages are fragmented and forwarded as data blocks. |
| 1197 | */ |
| 1198 | struct msgb *gprs_rlcmac_send_data_block_acknowledged( |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 1199 | struct gprs_rlcmac_tbf *tbf, uint32_t fn, uint8_t ts) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1200 | { |
| 1201 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 1202 | struct rlc_dl_header *rh; |
| 1203 | struct rlc_li_field *li; |
| 1204 | uint8_t block_length; /* total length of block, including spare bits */ |
| 1205 | uint8_t block_data; /* usable data of block, w/o spare bits, inc. MAC */ |
| 1206 | struct msgb *msg, *dl_msg; |
| 1207 | uint8_t bsn; |
| 1208 | uint16_t mod_sns = tbf->sns - 1; |
| 1209 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 1210 | uint16_t index; |
| 1211 | uint8_t *delimiter, *data, *e_pointer; |
| 1212 | uint8_t len; |
| 1213 | uint16_t space, chunk; |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1214 | int first_fin_ack; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1215 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1216 | LOGP(DRLCMACDL, LOGL_DEBUG, "DL DATA TBF=%d downlink (V(A)==%d .. " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1217 | "V(S)==%d)\n", tbf->tfi, tbf->dir.dl.v_a, tbf->dir.dl.v_s); |
| 1218 | |
| 1219 | do_resend: |
| 1220 | /* check if there is a block with negative acknowledgement */ |
| 1221 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1222 | bsn = (bsn + 1) & mod_sns) { |
| 1223 | index = (bsn & mod_sns_half); |
| 1224 | if (tbf->dir.dl.v_b[index] == 'N' |
| 1225 | || tbf->dir.dl.v_b[index] == 'X') { |
| 1226 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", |
| 1227 | bsn); |
| 1228 | /* re-send block with negative aknowlegement */ |
| 1229 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 1230 | goto tx_block; |
| 1231 | } |
| 1232 | } |
| 1233 | |
| 1234 | /* if the window has stalled, or transfer is complete, |
| 1235 | * send an unacknowledged block */ |
| 1236 | if (tbf->state == GPRS_RLCMAC_FINISHED |
| 1237 | || ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns) == tbf->ws) { |
| 1238 | int resend = 0; |
| 1239 | |
| 1240 | if (tbf->state == GPRS_RLCMAC_FINISHED) |
| 1241 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 1242 | "because all blocks have been transmitted.\n", |
| 1243 | tbf->dir.dl.v_a); |
| 1244 | else |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1245 | LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1246 | "because all window is stalled.\n", |
| 1247 | tbf->dir.dl.v_a); |
| 1248 | /* If V(S) == V(A) and finished state, we would have received |
| 1249 | * acknowledgement of all transmitted block. In this case we |
| 1250 | * would have transmitted the final block, and received ack |
| 1251 | * from MS. But in this case we did not receive the final ack |
| 1252 | * indication from MS. This should never happen if MS works |
| 1253 | * correctly. */ |
| 1254 | if (tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
Andreas Eversberg | 6664a90 | 2012-07-15 06:52:19 +0200 | [diff] [blame] | 1255 | LOGP(DRLCMACDL, LOGL_ERROR, "- MS acked all block, " |
| 1256 | "but we still transmitting!\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1257 | /* we just send final block again */ |
| 1258 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 1259 | goto tx_block; |
| 1260 | } |
| 1261 | |
| 1262 | /* cycle through all unacked blocks */ |
| 1263 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1264 | bsn = (bsn + 1) & mod_sns) { |
| 1265 | index = (bsn & mod_sns_half); |
| 1266 | if (tbf->dir.dl.v_b[index] == 'U') { |
| 1267 | /* mark to be re-send */ |
| 1268 | tbf->dir.dl.v_b[index] = 'X'; |
| 1269 | resend++; |
| 1270 | } |
| 1271 | } |
| 1272 | /* At this point there should be at leasst one unacked block |
| 1273 | * to be resent. If not, this is an software error. */ |
| 1274 | if (resend == 0) { |
| 1275 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 1276 | "There are no unacknowledged blocks, but V(A) " |
| 1277 | " != V(S). PLEASE FIX!\n"); |
| 1278 | /* we just send final block again */ |
| 1279 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 1280 | goto tx_block; |
| 1281 | } |
| 1282 | goto do_resend; |
| 1283 | } |
| 1284 | |
| 1285 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n", |
| 1286 | tbf->dir.dl.v_s); |
| 1287 | |
| 1288 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 1289 | index = tbf->dir.dl.v_s & mod_sns_half; |
| 1290 | data = tbf->rlc_block[index]; |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 1291 | if (tbf->cs == 0) { |
Andreas Eversberg | 499ff41 | 2012-10-03 14:21:36 +0200 | [diff] [blame] | 1292 | tbf->cs = bts->initial_cs_dl; |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 1293 | if (tbf->cs < 1 || tbf->cs > 4) |
| 1294 | tbf->cs = 1; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1295 | } |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 1296 | block_length = gprs_rlcmac_cs[tbf->cs].block_length; |
| 1297 | block_data = gprs_rlcmac_cs[tbf->cs].block_data; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1298 | memset(data, 0x2b, block_data); /* spare bits will be left 0 */ |
| 1299 | rh = (struct rlc_dl_header *)data; |
| 1300 | rh->pt = 0; /* Data Block */ |
| 1301 | rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */ |
| 1302 | rh->usf = 7; /* will be set at scheduler */ |
| 1303 | rh->pr = 0; /* FIXME: power reduction */ |
| 1304 | rh->tfi = tbf->tfi; /* TFI */ |
| 1305 | rh->fbi = 0; /* Final Block Indicator, set late, if true */ |
| 1306 | rh->bsn = tbf->dir.dl.v_s; /* Block Sequence Number */ |
| 1307 | rh->e = 0; /* Extension bit, maybe set later */ |
| 1308 | e_pointer = data + 2; /* points to E of current chunk */ |
| 1309 | data += 3; |
| 1310 | delimiter = data; /* where next length header would be stored */ |
| 1311 | space = block_data - 3; |
| 1312 | while (1) { |
| 1313 | chunk = tbf->llc_length - tbf->llc_index; |
| 1314 | /* if chunk will exceed block limit */ |
| 1315 | if (chunk > space) { |
| 1316 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1317 | "larger than space (%d) left in block: copy " |
| 1318 | "only remaining space, and we are done\n", |
| 1319 | chunk, space); |
| 1320 | /* block is filled, so there is no extension */ |
| 1321 | *e_pointer |= 0x01; |
| 1322 | /* fill only space */ |
| 1323 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1324 | /* incement index */ |
| 1325 | tbf->llc_index += space; |
| 1326 | /* return data block as message */ |
| 1327 | break; |
| 1328 | } |
| 1329 | /* if FINAL chunk would fit precisely in space left */ |
| 1330 | if (chunk == space && llist_empty(&tbf->llc_queue)) { |
| 1331 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1332 | "would exactly fit into space (%d): because " |
| 1333 | "this is a final block, we don't add length " |
| 1334 | "header, and we are done\n", chunk, space); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1335 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for " |
| 1336 | "TBF=%d that fits precisely in last block: " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1337 | "len=%d\n", tbf->tfi, tbf->llc_length); |
Andreas Eversberg | b3ded4c | 2012-07-24 10:47:24 +0200 | [diff] [blame] | 1338 | gprs_rlcmac_debug_bw(tbf, tbf->llc_length); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1339 | /* block is filled, so there is no extension */ |
| 1340 | *e_pointer |= 0x01; |
| 1341 | /* fill space */ |
| 1342 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1343 | /* reset LLC frame */ |
| 1344 | tbf->llc_index = tbf->llc_length = 0; |
| 1345 | /* final block */ |
| 1346 | rh->fbi = 1; /* we indicate final block */ |
| 1347 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1348 | /* return data block as message */ |
| 1349 | break; |
| 1350 | } |
| 1351 | /* if chunk would fit exactly in space left */ |
| 1352 | if (chunk == space) { |
| 1353 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1354 | "would exactly fit into space (%d): add length " |
| 1355 | "header with LI=0, to make frame extend to " |
| 1356 | "next block, and we are done\n", chunk, space); |
| 1357 | /* make space for delimiter */ |
| 1358 | if (delimiter != data) |
| 1359 | memcpy(delimiter + 1, delimiter, |
| 1360 | data - delimiter); |
| 1361 | data++; |
| 1362 | space--; |
| 1363 | /* add LI with 0 length */ |
| 1364 | li = (struct rlc_li_field *)delimiter; |
| 1365 | li->e = 1; /* not more extension */ |
| 1366 | li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| 1367 | li->li = 0; /* chunk fills the complete space */ |
| 1368 | // no need to set e_pointer nor increase delimiter |
| 1369 | /* fill only space, which is 1 octet less than chunk */ |
| 1370 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1371 | /* incement index */ |
| 1372 | tbf->llc_index += space; |
| 1373 | /* return data block as message */ |
| 1374 | break; |
| 1375 | } |
| 1376 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 1377 | "than remaining space (%d): add length header to " |
| 1378 | "to delimit LLC frame\n", chunk, space); |
| 1379 | /* the LLC frame chunk ends in this block */ |
| 1380 | /* make space for delimiter */ |
| 1381 | if (delimiter != data) |
| 1382 | memcpy(delimiter + 1, delimiter, data - delimiter); |
| 1383 | data++; |
| 1384 | space--; |
| 1385 | /* add LI to delimit frame */ |
| 1386 | li = (struct rlc_li_field *)delimiter; |
| 1387 | li->e = 0; /* Extension bit, maybe set later */ |
| 1388 | li->m = 0; /* will be set later, if there is more LLC data */ |
| 1389 | li->li = chunk; /* length of chunk */ |
| 1390 | e_pointer = delimiter; /* points to E of current delimiter */ |
| 1391 | delimiter++; |
| 1392 | /* copy (rest of) LLC frame to space */ |
| 1393 | memcpy(data, tbf->llc_frame + tbf->llc_index, chunk); |
| 1394 | data += chunk; |
| 1395 | space -= chunk; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1396 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for TBF=%d: " |
| 1397 | "len=%d\n", tbf->tfi, tbf->llc_length); |
Andreas Eversberg | b3ded4c | 2012-07-24 10:47:24 +0200 | [diff] [blame] | 1398 | gprs_rlcmac_debug_bw(tbf, tbf->llc_length); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1399 | /* reset LLC frame */ |
| 1400 | tbf->llc_index = tbf->llc_length = 0; |
| 1401 | /* dequeue next LLC frame, if any */ |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1402 | msg = llc_dequeue(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1403 | if (msg) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1404 | LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC for " |
| 1405 | "TBF=%d (len=%d)\n", tbf->tfi, msg->len); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1406 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1407 | tbf->llc_length = msg->len; |
| 1408 | msgb_free(msg); |
| 1409 | } |
| 1410 | /* if we have more data and we have space left */ |
| 1411 | if (space > 0 && tbf->llc_length) { |
| 1412 | li->m = 1; /* we indicate more frames to follow */ |
| 1413 | continue; |
| 1414 | } |
| 1415 | /* if we don't have more LLC frames */ |
| 1416 | if (!tbf->llc_length) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1417 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1418 | "done.\n"); |
| 1419 | li->e = 1; /* we cannot extend */ |
| 1420 | rh->fbi = 1; /* we indicate final block */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1421 | first_fin_ack = 1; |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1422 | /* + 1 indicates: first final ack */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1423 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1424 | break; |
| 1425 | } |
| 1426 | /* we have no space left */ |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1427 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1428 | "done.\n"); |
| 1429 | li->e = 1; /* we cannot extend */ |
| 1430 | break; |
| 1431 | } |
| 1432 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n", |
| 1433 | osmo_hexdump(tbf->rlc_block[index], block_length)); |
| 1434 | tbf->rlc_block_len[index] = block_length; |
| 1435 | /* raise send state and set ack state array */ |
| 1436 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 1437 | tbf->dir.dl.v_s = (tbf->dir.dl.v_s + 1) & mod_sns; /* inc send state */ |
| 1438 | |
| 1439 | tx_block: |
| 1440 | /* from this point on, new block is sent or old block is resent */ |
| 1441 | |
| 1442 | /* get data and header from current block */ |
| 1443 | data = tbf->rlc_block[index]; |
| 1444 | len = tbf->rlc_block_len[index]; |
| 1445 | rh = (struct rlc_dl_header *)data; |
| 1446 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1447 | /* Clear Polling, if still set in history buffer */ |
| 1448 | rh->s_p = 0; |
| 1449 | |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1450 | /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| 1451 | */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1452 | if (tbf->dir.dl.tx_counter >= POLL_ACK_AFTER_FRAMES || first_fin_ack) { |
| 1453 | if (first_fin_ack) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1454 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1455 | "polling, because first final block sent.\n"); |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1456 | } else { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1457 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 1458 | "polling, because %d blocks sent.\n", |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1459 | POLL_ACK_AFTER_FRAMES); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1460 | } |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1461 | /* scheduling not possible, because: */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1462 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1463 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1464 | "sheduled for TBF=%d, so we must wait for " |
| 1465 | "requesting downlink ack\n", tbf->tfi); |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1466 | else if (tbf->control_ts != ts) |
| 1467 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 1468 | "sheduled in this TS %d, waiting for " |
| 1469 | "TS %d\n", ts, tbf->control_ts); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1470 | else if (sba_find(tbf->trx, ts, (fn + 13) % 2715648)) |
| 1471 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 1472 | "sheduled, because single block alllocation " |
| 1473 | "already exists\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1474 | else { |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1475 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling sheduled in this " |
| 1476 | "TS %d\n", ts); |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1477 | tbf->dir.dl.tx_counter = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1478 | /* start timer whenever we send the final block */ |
| 1479 | if (rh->fbi == 1) |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 1480 | tbf_timer_start(tbf, 3191, bts->t3191, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1481 | |
| 1482 | /* schedule polling */ |
| 1483 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1484 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1485 | |
| 1486 | /* set polling in header */ |
| 1487 | rh->rrbp = 0; /* N+13 */ |
| 1488 | rh->s_p = 1; /* Polling */ |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1489 | |
| 1490 | /* Increment TX-counter */ |
| 1491 | tbf->dir.dl.tx_counter++; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1492 | } |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1493 | } else { |
| 1494 | /* Increment TX-counter */ |
| 1495 | tbf->dir.dl.tx_counter++; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1496 | } |
| 1497 | |
| 1498 | /* return data block as message */ |
| 1499 | dl_msg = msgb_alloc(len, "rlcmac_dl_data"); |
| 1500 | if (!dl_msg) |
| 1501 | return NULL; |
| 1502 | memcpy(msgb_put(dl_msg, len), data, len); |
| 1503 | |
| 1504 | return dl_msg; |
| 1505 | } |
| 1506 | |
| 1507 | int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final, |
| 1508 | uint8_t ssn, uint8_t *rbb) |
| 1509 | { |
| 1510 | char show_rbb[65], show_v_b[RLC_MAX_SNS + 1]; |
| 1511 | uint16_t mod_sns = tbf->sns - 1; |
| 1512 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 1513 | int i; /* must be signed */ |
| 1514 | int16_t dist; /* must be signed */ |
| 1515 | uint8_t bit; |
| 1516 | uint16_t bsn; |
| 1517 | struct msgb *msg; |
| 1518 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1519 | LOGP(DRLCMACDL, LOGL_DEBUG, "TBF=%d downlink acknowledge\n", |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1520 | tbf->tfi); |
| 1521 | |
| 1522 | if (!final) { |
| 1523 | /* show received array in debug (bit 64..1) */ |
| 1524 | for (i = 63; i >= 0; i--) { |
| 1525 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1526 | show_rbb[i] = (bit) ? '1' : 'o'; |
| 1527 | } |
| 1528 | show_rbb[64] = '\0'; |
| 1529 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1530 | "(BSN=%d) 1=ACK o=NACK\n", (ssn - 64) & mod_sns, |
| 1531 | show_rbb, (ssn - 1) & mod_sns); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1532 | |
| 1533 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 1534 | /* calculate distance of ssn from V(S) */ |
| 1535 | dist = (tbf->dir.dl.v_s - ssn) & mod_sns; |
| 1536 | /* check if distance is less than distance V(A)..V(S) */ |
| 1537 | if (dist < ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns)) { |
| 1538 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
| 1539 | for (i = 63, bsn = (ssn - 1) & mod_sns; |
| 1540 | i >= 0 && bsn != ((tbf->dir.dl.v_a - 1) & mod_sns); |
| 1541 | i--, bsn = (bsn - 1) & mod_sns) { |
| 1542 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1543 | if (bit) { |
| 1544 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1545 | "ack for BSN=%d\n", bsn); |
| 1546 | tbf->dir.dl.v_b[bsn & mod_sns_half] |
| 1547 | = 'A'; |
| 1548 | } else { |
| 1549 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1550 | "NACK for BSN=%d\n", bsn); |
| 1551 | tbf->dir.dl.v_b[bsn & mod_sns_half] |
| 1552 | = 'N'; |
| 1553 | } |
| 1554 | } |
| 1555 | } else { |
Andreas Eversberg | 0f13c40 | 2012-07-16 11:59:23 +0200 | [diff] [blame] | 1556 | /* this might happpen, if the downlink assignment |
| 1557 | * was not received by ms and the ack refers |
| 1558 | * to previous TBF |
| 1559 | * FIXME: we should implement polling for |
| 1560 | * control ack!*/ |
| 1561 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 1562 | "V(A)..V(S) range (DL TBF=%d) Free TFB!\n", |
| 1563 | tbf->tfi); |
| 1564 | return 1; /* indicate to free TBF */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1565 | } |
| 1566 | |
| 1567 | /* raise V(A), if possible */ |
| 1568 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1569 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1570 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] == 'A') { |
| 1571 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'I'; |
| 1572 | /* mark invalid */ |
| 1573 | tbf->dir.dl.v_a = (tbf->dir.dl.v_a + 1) |
| 1574 | & mod_sns; |
| 1575 | } else |
| 1576 | break; |
| 1577 | } |
| 1578 | |
| 1579 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 1580 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1581 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1582 | show_v_b[i] = tbf->dir.dl.v_b[bsn & mod_sns_half]; |
| 1583 | if (show_v_b[i] == 0) |
| 1584 | show_v_b[i] = ' '; |
| 1585 | } |
| 1586 | show_v_b[i] = '\0'; |
| 1587 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 1588 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 1589 | "X=Resend-Unacked\n", tbf->dir.dl.v_a, show_v_b, |
| 1590 | (tbf->dir.dl.v_s - 1) & mod_sns); |
| 1591 | |
Andreas Eversberg | 6664a90 | 2012-07-15 06:52:19 +0200 | [diff] [blame] | 1592 | if (tbf->state == GPRS_RLCMAC_FINISHED |
| 1593 | && tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
| 1594 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received final block, " |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1595 | "but without final ack inidcation\n"); |
Andreas Eversberg | 6664a90 | 2012-07-15 06:52:19 +0200 | [diff] [blame] | 1596 | } else |
| 1597 | return 0; |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1598 | } else |
| 1599 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1600 | |
| 1601 | /* check for LLC PDU in the LLC Queue */ |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1602 | msg = llc_dequeue(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1603 | if (!msg) { |
| 1604 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 1605 | |
| 1606 | /* no message, start T3193, change state to RELEASE */ |
| 1607 | LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we " |
| 1608 | "release.\n"); |
Andreas Eversberg | b3c6f6c | 2012-07-06 07:40:08 +0200 | [diff] [blame] | 1609 | /* start T3193 */ |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 1610 | tbf_timer_start(tbf, 3193, bts->t3193_msec / 1000, |
Andreas Eversberg | df4d20e | 2012-09-24 13:49:38 +0200 | [diff] [blame] | 1611 | (bts->t3193_msec % 1000) * 1000); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1612 | tbf_new_state(tbf, GPRS_RLCMAC_WAIT_RELEASE); |
| 1613 | |
| 1614 | return 0; |
| 1615 | } |
| 1616 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1617 | tbf->llc_length = msg->len; |
| 1618 | msgb_free(msg); |
| 1619 | |
| 1620 | /* we have a message, so we trigger downlink assignment, and there |
| 1621 | * set the state to ASSIGN. also we set old_downlink, because we |
| 1622 | * re-use this tbf. */ |
| 1623 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, " |
| 1624 | "because another LLC PDU has arrived in between\n"); |
| 1625 | memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); /* reset RLC states */ |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1626 | tbf->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; /* keep TO flags */ |
| 1627 | tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 1628 | tbf_update(tbf); |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1629 | gprs_rlcmac_trigger_downlink_assignment(tbf, tbf, NULL); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1630 | |
| 1631 | return 0; |
| 1632 | } |
| 1633 | |
| 1634 | |
| 1635 | struct msgb *gprs_rlcmac_send_packet_downlink_assignment( |
| 1636 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 1637 | { |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1638 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1639 | struct msgb *msg; |
| 1640 | struct gprs_rlcmac_tbf *new_tbf; |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1641 | int poll_ass_dl = POLLING_ASSIGNMENT_DL; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1642 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1643 | if (poll_ass_dl && tbf->direction == GPRS_RLCMAC_DL_TBF |
| 1644 | && tbf->control_ts != tbf->first_common_ts) { |
| 1645 | LOGP(DRLCMAC, LOGL_NOTICE, "Cannot poll for downlink " |
| 1646 | "assigment, because MS cannot reply.\n"); |
| 1647 | poll_ass_dl = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1648 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1649 | if (poll_ass_dl) { |
| 1650 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 1651 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already sheduled " |
| 1652 | "for TBF=%d, so we must wait for downlink " |
| 1653 | "assignment...\n", tbf->tfi); |
| 1654 | return NULL; |
| 1655 | } |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1656 | if (sba_find(tbf->trx, tbf->control_ts, (fn + 13) % 2715648)) { |
| 1657 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 1658 | "scheduled for single block allocation...\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1659 | return NULL; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1660 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1661 | } |
| 1662 | |
| 1663 | /* on uplink TBF we get the downlink TBF to be assigned. */ |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1664 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| 1665 | /* be sure to check first, if contention resolution is done, |
| 1666 | * otherwise we cannot send the assignment yet */ |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 1667 | if (!tbf->dir.ul.contention_resolution_done) { |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1668 | LOGP(DRLCMAC, LOGL_DEBUG, "Cannot assign DL TBF now, " |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1669 | "because contention resolution is not " |
| 1670 | "finished.\n"); |
| 1671 | return NULL; |
| 1672 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1673 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF); |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1674 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1675 | new_tbf = tbf; |
| 1676 | if (!new_tbf) { |
| 1677 | LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink " |
| 1678 | "assignment at uplink TBF=%d, but there is no downlink " |
| 1679 | "TBF\n", tbf->tfi); |
| 1680 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1681 | return NULL; |
| 1682 | } |
| 1683 | |
| 1684 | msg = msgb_alloc(23, "rlcmac_dl_ass"); |
| 1685 | if (!msg) |
| 1686 | return NULL; |
| 1687 | bitvec *ass_vec = bitvec_alloc(23); |
| 1688 | if (!ass_vec) { |
| 1689 | msgb_free(msg); |
| 1690 | return NULL; |
| 1691 | } |
| 1692 | bitvec_unhex(ass_vec, |
| 1693 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1694 | LOGP(DRLCMAC, LOGL_INFO, "TBF: START TFI: %u TLLI: 0x%08x Packet Downlink Assignment (PACCH)\n", new_tbf->tfi, new_tbf->tlli); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1695 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 1696 | write_packet_downlink_assignment(mac_control_block, tbf->tfi, |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1697 | (tbf->direction == GPRS_RLCMAC_DL_TBF), new_tbf, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1698 | poll_ass_dl, bts->alpha, bts->gamma); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1699 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n"); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 1700 | encode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1701 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 1702 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Downlink Assignment -------------------------\n"); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 1703 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1704 | bitvec_free(ass_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1705 | talloc_free(mac_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1706 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1707 | if (poll_ass_dl) { |
| 1708 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1709 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1710 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; |
| 1711 | } else { |
| 1712 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1713 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 1714 | tbf_assign_control_ts(new_tbf); |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 1715 | /* stop pending assignment timer */ |
| 1716 | tbf_timer_stop(new_tbf); |
| 1717 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1718 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1719 | |
| 1720 | return msg; |
| 1721 | } |
| 1722 | |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1723 | static void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf, uint8_t poll, |
| 1724 | char *imsi) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1725 | { |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1726 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 1727 | int plen; |
| 1728 | |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1729 | LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u TLLI: 0x%08x Immediate Assignment Downlink (PCH)\n", tbf->tfi, tbf->tlli); |
Andreas Eversberg | 7b04501 | 2012-07-05 07:38:49 +0200 | [diff] [blame] | 1730 | bitvec *immediate_assignment = bitvec_alloc(22); /* without plen */ |
| 1731 | bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1732 | /* use request reference that has maximum distance to current time, |
| 1733 | * so the assignment will not conflict with possible RACH requests. */ |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1734 | plen = write_immediate_assignment(immediate_assignment, 1, 125, |
| 1735 | (tbf->pdch[tbf->first_ts]->last_rts_fn + 21216) % 2715648, tbf->ta, |
| 1736 | tbf->arfcn, tbf->first_ts, tbf->tsc, tbf->tfi, 0, tbf->tlli, poll, |
| 1737 | tbf->poll_fn, 0, bts->alpha, bts->gamma); |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1738 | pcu_l1if_tx_pch(immediate_assignment, plen, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1739 | bitvec_free(immediate_assignment); |
| 1740 | } |
| 1741 | |
| 1742 | /* depending on the current TBF, we assign on PACCH or AGCH */ |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1743 | void gprs_rlcmac_trigger_downlink_assignment(struct gprs_rlcmac_tbf *tbf, |
| 1744 | struct gprs_rlcmac_tbf *old_tbf, char *imsi) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1745 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1746 | #ifdef DEBUG_DL_ASS_IDLE |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1747 | strncpy(debug_imsi, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1748 | LOGP(DRLCMAC, LOGL_ERROR, "**** DEBUGGING DOWNLINK ASSIGNMENT ****\n"); |
| 1749 | #endif |
| 1750 | |
| 1751 | /* stop pending timer */ |
| 1752 | tbf_timer_stop(tbf); |
| 1753 | |
| 1754 | /* check for downlink tbf: */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1755 | if (old_tbf) { |
| 1756 | #ifdef DEBUG_DL_ASS_IDLE |
| 1757 | LOGP(DRLCMAC, LOGL_ERROR, "We must wait for current TBF to be " |
| 1758 | "released.\n"); |
| 1759 | /* wait one second until assignment */ |
| 1760 | tbf_timer_start(tbf, 1234, 1,0); |
| 1761 | #else |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1762 | LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment on " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1763 | "PACCH, because %s TBF=%d exists for TLLI=0x%08x\n", |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1764 | (old_tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 1765 | ? "UL" : "DL", old_tbf->tfi, old_tbf->tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1766 | old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
| 1767 | /* use TA from old TBF */ |
| 1768 | tbf->ta = old_tbf->ta; |
| 1769 | /* change state */ |
| 1770 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 1771 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1772 | /* start timer */ |
| 1773 | tbf_timer_start(tbf, 0, Tassign_pacch); |
| 1774 | #endif |
| 1775 | } else { |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1776 | LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment for TBF=%d on PCH, no TBF exist (IMSI=%s)\n", tbf->tfi, imsi); |
| 1777 | if (!imsi || strlen(imsi) < 3) { |
| 1778 | LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI!\n"); |
| 1779 | return; |
| 1780 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1781 | /* change state */ |
| 1782 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 1783 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1784 | strncpy(tbf->dir.dl.imsi, imsi, sizeof(tbf->dir.dl.imsi)); |
Andreas Eversberg | 7438df7 | 2012-07-23 18:04:49 +0200 | [diff] [blame] | 1785 | /* send immediate assignment */ |
| 1786 | gprs_rlcmac_downlink_assignment(tbf, 0, imsi); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1787 | tbf->dir.dl.wait_confirm = 1; |
| 1788 | } |
| 1789 | } |
| 1790 | |
| 1791 | int gprs_rlcmac_imm_ass_cnf(uint8_t *data, uint32_t fn) |
| 1792 | { |
| 1793 | struct gprs_rlcmac_tbf *tbf; |
| 1794 | uint8_t plen; |
| 1795 | uint32_t tlli; |
| 1796 | |
| 1797 | /* move to IA Rest Octets */ |
| 1798 | plen = data[0] >> 2; |
| 1799 | data += 1 + plen; |
| 1800 | |
| 1801 | if ((*data & 0xf0) != 0xd0) { |
| 1802 | LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but rest " |
| 1803 | "octets do not start with bit sequence 'HH01' " |
| 1804 | "(Packet Downlink Assignment)\n"); |
| 1805 | return -EINVAL; |
| 1806 | } |
| 1807 | |
| 1808 | /* get TLLI from downlink assignment */ |
| 1809 | tlli = (*data++) << 28; |
| 1810 | tlli |= (*data++) << 20; |
| 1811 | tlli |= (*data++) << 12; |
| 1812 | tlli |= (*data++) << 4; |
| 1813 | tlli |= (*data++) >> 4; |
| 1814 | |
| 1815 | tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF); |
| 1816 | if (!tbf) { |
| 1817 | LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but TLLI=%08x " |
| 1818 | "does not exit\n", tlli); |
| 1819 | return -EINVAL; |
| 1820 | } |
| 1821 | |
| 1822 | LOGP(DRLCMAC, LOGL_DEBUG, "Got IMM.ASS confirm for TLLI=%08x\n", tlli); |
| 1823 | |
| 1824 | if (tbf->dir.dl.wait_confirm) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1825 | tbf_timer_start(tbf, 0, Tassign_agch); |
| 1826 | } |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1827 | |
| 1828 | return 0; |
| 1829 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1830 | |