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, |
Holger Hans Peter Freyther | 52c911b | 2013-08-24 18:30:54 +0200 | [diff] [blame] | 77 | const char *imsi); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 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; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 112 | debug_diagram(tbf->diag, "timeout UL-ACK"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 113 | if (tbf->state == GPRS_RLCMAC_FINISHED) { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 114 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 115 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 116 | tbf->dir.ul.n3103++; |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 117 | if (tbf->dir.ul.n3103 == bts->n3103) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 118 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 119 | "- N3103 exceeded\n"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 120 | debug_diagram(tbf->diag, "N3103 exceeded"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 121 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 122 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 123 | return 0; |
| 124 | } |
| 125 | /* reschedule UL ack */ |
| 126 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 127 | } |
| 128 | } else |
| 129 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 130 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 131 | |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 132 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| 133 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 134 | "PACKET CONTROL ACK for PACKET UPLINK " |
| 135 | "ASSIGNMENT.\n"); |
| 136 | gprs_rlcmac_diag(tbf); |
| 137 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| 138 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 139 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 140 | debug_diagram(tbf->diag, "timeout UL-ASS"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 141 | tbf->n3105++; |
| 142 | if (tbf->n3105 == bts->n3105) { |
| 143 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 144 | debug_diagram(tbf->diag, "N3105 exceeded"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 145 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 146 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 147 | return 0; |
| 148 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 149 | /* reschedule UL assignment */ |
| 150 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 151 | } else |
| 152 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 153 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 154 | |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 155 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| 156 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 157 | "PACKET CONTROL ACK for PACKET DOWNLINK " |
| 158 | "ASSIGNMENT.\n"); |
| 159 | gprs_rlcmac_diag(tbf); |
| 160 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| 161 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 162 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 163 | debug_diagram(tbf->diag, "timeout DL-ASS"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 164 | tbf->n3105++; |
| 165 | if (tbf->n3105 == bts->n3105) { |
| 166 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 167 | debug_diagram(tbf->diag, "N3105 exceeded"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 168 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
| 169 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
| 170 | return 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 171 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 172 | /* reschedule DL assignment */ |
| 173 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 174 | } else |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 175 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 176 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 177 | |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 178 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| 179 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 180 | "PACKET DOWNLINK ACK.\n"); |
| 181 | gprs_rlcmac_diag(tbf); |
| 182 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 183 | } |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 184 | debug_diagram(tbf->diag, "timeout DL-ACK"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 185 | tbf->n3105++; |
| 186 | if (tbf->n3105 == bts->n3105) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 187 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 188 | debug_diagram(tbf->diag, "N3105 exceeded"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 189 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
| 190 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
| 191 | return 0; |
| 192 | } |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 193 | /* resend IMM.ASS on CCCH on timeout */ |
| 194 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)) |
| 195 | && !(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) { |
| 196 | LOGP(DRLCMAC, LOGL_DEBUG, "Re-send dowlink assignment " |
| 197 | "for TBF=%d on PCH (IMSI=%s)\n", tbf->tfi, |
| 198 | tbf->dir.dl.imsi); |
| 199 | /* send immediate assignment */ |
| 200 | gprs_rlcmac_downlink_assignment(tbf, 0, tbf->dir.dl.imsi); |
| 201 | tbf->dir.dl.wait_confirm = 1; |
| 202 | } |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 203 | } else |
| 204 | LOGP(DRLCMAC, LOGL_ERROR, "- Poll Timeout, but no event!\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 205 | |
| 206 | return 0; |
| 207 | } |
| 208 | |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 209 | int gprs_rlcmac_sba_timeout(struct gprs_rlcmac_sba *sba) |
| 210 | { |
| 211 | LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for SBA\n"); |
| 212 | llist_del(&sba->list); |
| 213 | talloc_free(sba); |
| 214 | |
| 215 | return 0; |
| 216 | } |
| 217 | |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 218 | static uint8_t get_ms_class_by_capability(MS_Radio_Access_capability_t *cap) |
| 219 | { |
| 220 | int i; |
| 221 | |
| 222 | for (i = 0; i < cap->Count_MS_RA_capability_value; i++) { |
| 223 | if (!cap->MS_RA_capability_value[i].u.Content.Exist_Multislot_capability) |
| 224 | continue; |
| 225 | if (!cap->MS_RA_capability_value[i].u.Content.Multislot_capability.Exist_GPRS_multislot_class) |
| 226 | continue; |
| 227 | 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] | 228 | } |
| 229 | |
| 230 | return 0; |
| 231 | } |
| 232 | |
Andreas Eversberg | 02d7cd2 | 2013-01-15 08:59:34 +0100 | [diff] [blame] | 233 | static struct gprs_rlcmac_tbf *alloc_ul_tbf(int8_t use_trx, uint8_t ms_class, |
| 234 | uint32_t tlli, uint8_t ta, struct gprs_rlcmac_tbf *dl_tbf) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 235 | { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 236 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | 02d7cd2 | 2013-01-15 08:59:34 +0100 | [diff] [blame] | 237 | uint8_t trx; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 238 | struct gprs_rlcmac_tbf *tbf; |
| 239 | uint8_t tfi; |
| 240 | |
Holger Hans Peter Freyther | bcafdf8 | 2013-08-24 21:13:31 +0200 | [diff] [blame^] | 241 | #warning "Copy and paste with tbf_new_dl_assignment" |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 242 | /* create new TBF, use sme TRX as DL TBF */ |
Holger Hans Peter Freyther | d6bd91e | 2013-08-24 21:16:55 +0200 | [diff] [blame] | 243 | tfi = tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &trx, use_trx); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 244 | if (tfi < 0) { |
| 245 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 246 | /* FIXME: send reject */ |
| 247 | return NULL; |
| 248 | } |
| 249 | /* use multislot class of downlink TBF */ |
Holger Hans Peter Freyther | b67a8a3 | 2013-07-28 18:55:14 +0200 | [diff] [blame] | 250 | tbf = tbf_alloc(bts, dl_tbf, GPRS_RLCMAC_UL_TBF, tfi, trx, ms_class, 0); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 251 | if (!tbf) { |
| 252 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 253 | /* FIXME: send reject */ |
| 254 | return NULL; |
| 255 | } |
| 256 | tbf->tlli = tlli; |
| 257 | tbf->tlli_valid = 1; /* no contention resolution */ |
| 258 | tbf->dir.ul.contention_resolution_done = 1; |
| 259 | tbf->ta = ta; /* use current TA */ |
| 260 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
| 261 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH); |
| 262 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
| 263 | |
| 264 | return tbf; |
| 265 | } |
| 266 | |
| 267 | |
| 268 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 269 | /* Received Uplink RLC control block. */ |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 270 | int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint8_t trx, uint8_t ts, |
| 271 | uint32_t fn) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 272 | { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 273 | int8_t tfi = 0; /* must be signed */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 274 | uint32_t tlli = 0; |
| 275 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 276 | struct gprs_rlcmac_sba *sba; |
Holger Hans Peter Freyther | b67a8a3 | 2013-07-28 18:55:14 +0200 | [diff] [blame] | 277 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | 0f13c40 | 2012-07-16 11:59:23 +0200 | [diff] [blame] | 278 | int rc; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 279 | |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 280 | 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] | 281 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 282 | decode_gsm_rlcmac_uplink(rlc_block, ul_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 283 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 284 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 285 | switch (ul_control_block->u.MESSAGE_TYPE) { |
| 286 | case MT_PACKET_CONTROL_ACK: |
| 287 | tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 288 | tbf = tbf_by_poll_fn(fn, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 289 | if (!tbf) { |
| 290 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 291 | "unknown FN=%u TLL=0x%08x (TRX %d TS %d)\n", |
| 292 | fn, tlli, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 293 | break; |
| 294 | } |
| 295 | tfi = tbf->tfi; |
| 296 | if (tlli != tbf->tlli) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 297 | LOGP(DRLCMAC, LOGL_INFO, "Phone changed TLLI to " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 298 | "0x%08x\n", tlli); |
| 299 | tbf->tlli = tlli; |
| 300 | } |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 301 | 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] | 302 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 303 | |
| 304 | /* check if this control ack belongs to packet uplink ack */ |
| 305 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 306 | 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] | 307 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 308 | debug_diagram(tbf->diag, "got CTL-ACK (fin)"); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 309 | if ((tbf->state_flags & |
| 310 | (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { |
| 311 | tbf->state_flags &= |
| 312 | ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); |
| 313 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 314 | "ack for UL TBF=%d\n", tbf->tfi); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 315 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 316 | tbf_free(tbf); |
| 317 | break; |
| 318 | } |
| 319 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 320 | 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] | 321 | /* reset N3105 */ |
| 322 | tbf->n3105 = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 323 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 324 | debug_diagram(tbf->diag, "got CTL-ACK DL-ASS"); |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 325 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 326 | tbf = tbf_by_tlli(tbf->tlli, |
| 327 | GPRS_RLCMAC_DL_TBF); |
| 328 | if (!tbf) { |
| 329 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL " |
| 330 | "TBF is gone\n"); |
| 331 | break; |
| 332 | } |
| 333 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 334 | /* stop pending assignment timer */ |
| 335 | tbf_timer_stop(tbf); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 336 | if ((tbf->state_flags & |
| 337 | (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| 338 | tbf->state_flags &= |
| 339 | ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| 340 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink " |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 341 | "assignment for DL TBF=%d\n", tbf->tfi); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 342 | } |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 343 | tbf_assign_control_ts(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 344 | break; |
| 345 | } |
| 346 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 347 | 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] | 348 | /* reset N3105 */ |
| 349 | tbf->n3105 = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 350 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 351 | debug_diagram(tbf->diag, "got CTL-AC UL-ASS"); |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 352 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 353 | tbf = tbf_by_tlli(tbf->tlli, |
| 354 | GPRS_RLCMAC_UL_TBF); |
| 355 | if (!tbf) { |
| 356 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL " |
| 357 | "TBF is gone\n"); |
| 358 | break; |
| 359 | } |
| 360 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 361 | if ((tbf->state_flags & |
| 362 | (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| 363 | tbf->state_flags &= |
| 364 | ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| 365 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 366 | "assignment for UL TBF=%d\n", tbf->tfi); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 367 | } |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 368 | tbf_assign_control_ts(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 369 | break; |
| 370 | } |
| 371 | LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK " |
| 372 | "at no request\n"); |
| 373 | break; |
| 374 | case MT_PACKET_DOWNLINK_ACK_NACK: |
| 375 | tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 376 | tbf = tbf_by_poll_fn(fn, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 377 | if (!tbf) { |
| 378 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
Andreas Eversberg | aafcd70 | 2012-10-07 15:33:31 +0200 | [diff] [blame] | 379 | "unknown FN=%u TFI=%d (TRX %d TS %d)\n", |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 380 | fn, tfi, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 381 | break; |
| 382 | } |
Andreas Eversberg | aafcd70 | 2012-10-07 15:33:31 +0200 | [diff] [blame] | 383 | if (tbf->tfi != tfi) { |
| 384 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
| 385 | "wrong TFI=%d, ignoring!\n", tfi); |
| 386 | break; |
| 387 | } |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 388 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK); |
| 389 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| 390 | tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
Andreas Eversberg | aafcd70 | 2012-10-07 15:33:31 +0200 | [diff] [blame] | 391 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink ack " |
| 392 | "for DL TBF=%d\n", tbf->tfi); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 393 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 394 | /* reset N3105 */ |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 395 | tbf->n3105 = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 396 | /* stop timer T3191 */ |
| 397 | tbf_timer_stop(tbf); |
| 398 | tlli = tbf->tlli; |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 399 | 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] | 400 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 401 | debug_diagram(tbf->diag, "got DL-ACK"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 402 | |
Andreas Eversberg | 0f13c40 | 2012-07-16 11:59:23 +0200 | [diff] [blame] | 403 | rc = gprs_rlcmac_downlink_ack(tbf, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 404 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.FINAL_ACK_INDICATION, |
| 405 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER, |
| 406 | 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] | 407 | if (rc == 1) { |
| 408 | tbf_free(tbf); |
| 409 | break; |
| 410 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 411 | /* check for channel request */ |
| 412 | 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] | 413 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack " |
| 414 | "message, so we provide one:\n"); |
Andreas Eversberg | 02d7cd2 | 2013-01-15 08:59:34 +0100 | [diff] [blame] | 415 | alloc_ul_tbf(tbf->trx, tbf->ms_class, tbf->tlli, tbf->ta, tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 416 | /* schedule uplink assignment */ |
| 417 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
| 418 | } |
| 419 | break; |
| 420 | case MT_PACKET_RESOURCE_REQUEST: |
| 421 | if (ul_control_block->u.Packet_Resource_Request.ID.UnionType) { |
| 422 | tlli = ul_control_block->u.Packet_Resource_Request.ID.u.TLLI; |
| 423 | tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | 99a107d | 2012-09-27 09:21:52 +0200 | [diff] [blame] | 424 | if (tbf) { |
| 425 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 426 | "TLLI=0x%08x while UL TBF=%d still " |
| 427 | "exists. Killing pending DL TBF\n", |
| 428 | tlli, tbf->tfi); |
| 429 | tbf_free(tbf); |
| 430 | tbf = NULL; |
| 431 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 432 | if (!tbf) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 433 | uint8_t ms_class = 0; |
Andreas Eversberg | 99a107d | 2012-09-27 09:21:52 +0200 | [diff] [blame] | 434 | struct gprs_rlcmac_tbf *dl_tbf; |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 435 | uint8_t ta; |
Andreas Eversberg | 99a107d | 2012-09-27 09:21:52 +0200 | [diff] [blame] | 436 | |
| 437 | if ((dl_tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF))) { |
| 438 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 439 | "TLLI=0x%08x while DL TBF=%d still exists. " |
| 440 | "Killing pending DL TBF\n", tlli, |
| 441 | dl_tbf->tfi); |
| 442 | tbf_free(dl_tbf); |
| 443 | } |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 444 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF " |
| 445 | "in packet ressource request of single " |
| 446 | "block, so we provide one:\n"); |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 447 | sba = sba_find(trx, ts, fn); |
| 448 | if (!sba) { |
| 449 | LOGP(DRLCMAC, LOGL_NOTICE, "MS requests UL TBF " |
| 450 | "in packet ressource request of single " |
| 451 | "block, but there is no resource request " |
| 452 | "scheduled!\n"); |
| 453 | rc = recall_timing_advance(tlli); |
| 454 | if (rc >= 0) |
| 455 | ta = rc; |
| 456 | else |
| 457 | ta = 0; |
| 458 | } else { |
| 459 | ta = sba->ta; |
| 460 | remember_timing_advance(tlli, ta); |
| 461 | llist_del(&sba->list); |
| 462 | talloc_free(sba); |
| 463 | } |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 464 | if (ul_control_block->u.Packet_Resource_Request.Exist_MS_Radio_Access_capability) |
| 465 | ms_class = get_ms_class_by_capability(&ul_control_block->u.Packet_Resource_Request.MS_Radio_Access_capability); |
| 466 | if (!ms_class) |
| 467 | LOGP(DRLCMAC, LOGL_NOTICE, "MS does not give us a class.\n"); |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 468 | tbf = alloc_ul_tbf(trx, ms_class, tlli, ta, NULL); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 469 | if (!tbf) |
| 470 | break; |
| 471 | /* set control ts to current MS's TS, until assignment complete */ |
| 472 | LOGP(DRLCMAC, LOGL_DEBUG, "Change control TS to %d until assinment is complete.\n", ts); |
| 473 | tbf->control_ts = ts; |
| 474 | /* schedule uplink assignment */ |
| 475 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 476 | debug_diagram(tbf->diag, "Res. REQ"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 477 | break; |
| 478 | } |
| 479 | tfi = tbf->tfi; |
| 480 | } else { |
| 481 | if (ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.UnionType) { |
| 482 | tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.DOWNLINK_TFI; |
Holger Hans Peter Freyther | b67a8a3 | 2013-07-28 18:55:14 +0200 | [diff] [blame] | 483 | tbf = tbf_by_tfi(bts, tfi, trx, GPRS_RLCMAC_DL_TBF); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 484 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 485 | 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] | 486 | break; |
| 487 | } |
| 488 | } else { |
| 489 | tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.UPLINK_TFI; |
Holger Hans Peter Freyther | b67a8a3 | 2013-07-28 18:55:14 +0200 | [diff] [blame] | 490 | tbf = tbf_by_tfi(bts, tfi, trx, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 491 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 492 | 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] | 493 | break; |
| 494 | } |
| 495 | } |
| 496 | tlli = tbf->tlli; |
| 497 | } |
Andreas Eversberg | c8466f4 | 2012-07-15 19:34:53 +0200 | [diff] [blame] | 498 | 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] | 499 | break; |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 500 | case MT_PACKET_MEASUREMENT_REPORT: |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 501 | sba = sba_find(trx, ts, fn); |
| 502 | if (!sba) { |
| 503 | LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement " |
| 504 | "in packet ressource request of single " |
| 505 | "block, but there is no resource request " |
| 506 | "scheduled!\n"); |
| 507 | } else { |
| 508 | remember_timing_advance(ul_control_block->u.Packet_Measurement_Report.TLLI, sba->ta); |
| 509 | llist_del(&sba->list); |
| 510 | talloc_free(sba); |
| 511 | } |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 512 | gprs_rlcmac_meas_rep(&ul_control_block->u.Packet_Measurement_Report); |
| 513 | break; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 514 | default: |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 515 | LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] unknown control block received\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 516 | } |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 517 | talloc_free(ul_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 518 | return 1; |
| 519 | } |
| 520 | |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 521 | #ifdef DEBUG_DL_ASS_IDLE |
| 522 | char debug_imsi[16]; |
| 523 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 524 | |
| 525 | void tbf_timer_cb(void *_tbf) |
| 526 | { |
| 527 | struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf; |
| 528 | |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 529 | LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d timer %u expired.\n", |
| 530 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 531 | tbf->T); |
| 532 | |
| 533 | tbf->num_T_exp++; |
| 534 | |
| 535 | switch (tbf->T) { |
| 536 | #ifdef DEBUG_DL_ASS_IDLE |
| 537 | case 1234: |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 538 | gprs_rlcmac_trigger_downlink_assignment(tbf, NULL, debug_imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 539 | break; |
| 540 | #endif |
| 541 | case 0: /* assignment */ |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 542 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) { |
| 543 | if (tbf->state == GPRS_RLCMAC_ASSIGN) { |
| 544 | LOGP(DRLCMAC, LOGL_NOTICE, "Releasing due to " |
| 545 | "PACCH assignment timeout.\n"); |
| 546 | tbf_free(tbf); |
| 547 | } else |
| 548 | LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not " |
| 549 | "in assign state\n"); |
| 550 | } |
| 551 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) { |
| 552 | /* change state to FLOW, so scheduler will start transmission */ |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 553 | tbf->dir.dl.wait_confirm = 0; |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 554 | if (tbf->state == GPRS_RLCMAC_ASSIGN) { |
| 555 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 556 | tbf_assign_control_ts(tbf); |
| 557 | } else |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 558 | LOGP(DRLCMAC, LOGL_NOTICE, "Continue flow after " |
| 559 | "IMM.ASS confirm\n"); |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 560 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 561 | break; |
| 562 | case 3169: |
| 563 | case 3191: |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 564 | case 3195: |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 565 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF T%d timeout during " |
| 566 | "transsmission\n", tbf->T); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 567 | gprs_rlcmac_diag(tbf); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 568 | /* fall through */ |
| 569 | case 3193: |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 570 | if (tbf->T == 3193) |
| 571 | debug_diagram(tbf->diag, "T3193 timeout"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 572 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n"); |
| 573 | /* free TBF */ |
| 574 | tbf_free(tbf); |
| 575 | break; |
| 576 | default: |
| 577 | LOGP(DRLCMAC, LOGL_ERROR, "Timer expired in unknown mode: %u\n", |
| 578 | tbf->T); |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | /* |
| 583 | * UL data block flow |
| 584 | */ |
| 585 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 586 | /* get TLLI from received UL data block */ |
| 587 | static int tlli_from_ul_data(uint8_t *data, uint8_t len, uint32_t *tlli) |
| 588 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 589 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 590 | struct rlc_li_field *li; |
| 591 | uint8_t e; |
Andreas Eversberg | 106ea79 | 2012-11-04 12:55:16 +0100 | [diff] [blame] | 592 | uint32_t _tlli; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 593 | |
| 594 | if (!rh->ti) |
| 595 | return -EINVAL; |
| 596 | |
| 597 | data += 3; |
| 598 | len -= 3; |
| 599 | e = rh->e; |
| 600 | /* if E is not set (LI follows) */ |
| 601 | while (!e) { |
| 602 | if (!len) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 603 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA LI extended, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 604 | "but no more data\n"); |
| 605 | return -EINVAL; |
| 606 | } |
| 607 | /* get new E */ |
| 608 | li = (struct rlc_li_field *)data; |
| 609 | if (li->e == 0) /* if LI==0, E is interpreted as '1' */ |
| 610 | e = 1; |
| 611 | else |
| 612 | e = li->e; |
| 613 | data++; |
| 614 | len--; |
| 615 | } |
| 616 | if (len < 4) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 617 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of frame " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 618 | "border\n"); |
| 619 | return -EINVAL; |
| 620 | } |
Andreas Eversberg | 106ea79 | 2012-11-04 12:55:16 +0100 | [diff] [blame] | 621 | memcpy(&_tlli, data, 4); |
| 622 | *tlli = ntohl(_tlli); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 623 | |
| 624 | return 0; |
| 625 | } |
| 626 | |
| 627 | /* Store received block data in LLC message(s) and forward to SGSN if complete. |
| 628 | */ |
| 629 | static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data, |
| 630 | uint8_t len) |
| 631 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 632 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 633 | uint8_t e, m; |
| 634 | struct rlc_li_field *li; |
| 635 | uint8_t frame_offset[16], offset = 0, chunk; |
| 636 | int i, frames = 0; |
| 637 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 638 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 639 | |
| 640 | data += 3; |
| 641 | len -= 3; |
| 642 | e = rh->e; /* if extended */ |
| 643 | m = 1; /* more frames, that means: the first frame */ |
| 644 | |
| 645 | /* Parse frame offsets from length indicator(s), if any. */ |
| 646 | while (1) { |
| 647 | if (frames == (int)sizeof(frame_offset)) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 648 | LOGP(DRLCMACUL, LOGL_ERROR, "Too many frames in " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 649 | "block\n"); |
| 650 | return -EINVAL; |
| 651 | } |
| 652 | frame_offset[frames++] = offset; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 653 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 654 | "%d\n", frames, offset); |
| 655 | if (!len) |
| 656 | break; |
| 657 | /* M == 0 and E == 0 is not allowed in this version. */ |
| 658 | if (!m && !e) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 659 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 660 | "ignored, because M='0' and E='0'.\n", |
| 661 | tbf->tfi); |
| 662 | return 0; |
| 663 | } |
| 664 | /* no more frames in this segment */ |
| 665 | if (e) { |
| 666 | break; |
| 667 | } |
| 668 | /* There is a new frame and an LI that delimits it. */ |
| 669 | if (m) { |
| 670 | li = (struct rlc_li_field *)data; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 671 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n", |
| 672 | li->li); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 673 | /* Special case: LI == 0 |
| 674 | * If the last segment would fit precisely into the |
| 675 | * rest of the RLC MAC block, there would be no way |
| 676 | * to delimit that this segment ends and is not |
| 677 | * continued in the next block. |
| 678 | * The special LI (0) is used to force the segment to |
| 679 | * extend into the next block, so it is delimited there. |
| 680 | * This LI must be skipped. Also it is the last LI. |
| 681 | */ |
| 682 | if (li->li == 0) { |
| 683 | data++; |
| 684 | len--; |
| 685 | m = 1; /* M is ignored, we know there is more */ |
| 686 | break; /* handle E as '1', so we break! */ |
| 687 | } |
| 688 | e = li->e; |
| 689 | m = li->m; |
| 690 | offset += li->li; |
| 691 | data++; |
| 692 | len--; |
| 693 | continue; |
| 694 | } |
| 695 | } |
| 696 | if (!m) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 697 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 698 | "data\n"); |
| 699 | } |
| 700 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 701 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 702 | len); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 703 | /* TLLI */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 704 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 705 | if (len < 4) { |
| 706 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of " |
| 707 | "frame border\n"); |
| 708 | return -EINVAL; |
| 709 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 710 | data += 4; |
| 711 | len -= 4; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 712 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: " |
| 713 | "%d\n", len); |
| 714 | } |
| 715 | |
| 716 | /* PFI */ |
| 717 | if (rh->pi) { |
| 718 | LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, " |
| 719 | "please disable in SYSTEM INFORMATION\n"); |
| 720 | if (len < 1) { |
| 721 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA PFI out of " |
| 722 | "frame border\n"); |
| 723 | return -EINVAL; |
| 724 | } |
| 725 | data++; |
| 726 | len--; |
| 727 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 728 | "%d\n", len); |
| 729 | } |
| 730 | |
| 731 | /* Now we have: |
| 732 | * - a list of frames offsets: frame_offset[] |
| 733 | * - number of frames: i |
| 734 | * - m == 0: Last frame carries spare data (end of TBF). |
| 735 | */ |
| 736 | |
| 737 | /* Check if last offset would exceed frame. */ |
| 738 | if (offset > len) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 739 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d ignored, " |
| 740 | "because LI delimits data that exceeds block size.\n", |
| 741 | tbf->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 742 | return -EINVAL; |
| 743 | } |
| 744 | |
| 745 | /* create LLC frames */ |
| 746 | for (i = 0; i < frames; i++) { |
| 747 | /* last frame ? */ |
| 748 | if (i == frames - 1) { |
| 749 | /* no more data in last frame */ |
| 750 | if (!m) |
| 751 | break; |
| 752 | /* data until end of frame */ |
| 753 | chunk = len - frame_offset[i]; |
| 754 | } else { |
| 755 | /* data until next frame */ |
| 756 | chunk = frame_offset[i + 1] - frame_offset[i]; |
| 757 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 758 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 759 | "frame at %d.\n", chunk, tbf->llc_index); |
| 760 | if (tbf->llc_index + chunk > LLC_MAX_LEN) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 761 | LOGP(DRLCMACUL, LOGL_NOTICE, "LLC frame exceeds " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 762 | "maximum size.\n"); |
| 763 | chunk = LLC_MAX_LEN - tbf->llc_index; |
| 764 | } |
| 765 | memcpy(tbf->llc_frame + tbf->llc_index, data + frame_offset[i], |
| 766 | chunk); |
| 767 | tbf->llc_index += chunk; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 768 | /* not last frame. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 769 | if (i != frames - 1) { |
| 770 | /* send frame to SGSN */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 771 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 772 | "TBF=%d: len=%d\n", tbf->tfi, tbf->llc_index); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 773 | gprs_rlcmac_tx_ul_ud(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 774 | tbf->llc_index = 0; /* reset frame space */ |
| 775 | /* also check if CV==0, because the frame may fill up the |
| 776 | * block precisely, then it is also complete. normally the |
| 777 | * frame would be extended into the next block with a 0-length |
| 778 | * delimiter added to this block. */ |
| 779 | } else if (rh->cv == 0) { |
| 780 | /* send frame to SGSN */ |
| 781 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 782 | "TBF=%d that fits precisely in last block: " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 783 | "len=%d\n", tbf->tfi, tbf->llc_index); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 784 | gprs_rlcmac_tx_ul_ud(tbf); |
| 785 | tbf->llc_index = 0; /* reset frame space */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 786 | } |
| 787 | } |
| 788 | |
| 789 | return 0; |
| 790 | } |
| 791 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 792 | struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_tbf *tbf, |
| 793 | uint32_t fn) |
| 794 | { |
| 795 | int final = (tbf->state == GPRS_RLCMAC_FINISHED); |
| 796 | struct msgb *msg; |
| 797 | |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 798 | if (final) { |
| 799 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 800 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 801 | "sheduled for TBF=%d, so we must wait for " |
| 802 | "final uplink ack...\n", tbf->tfi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 803 | return NULL; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 804 | } |
| 805 | if (sba_find(tbf->trx, tbf->control_ts, (fn + 13) % 2715648)) { |
| 806 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 807 | "scheduled for single block allocation...\n"); |
| 808 | return NULL; |
| 809 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 810 | } |
| 811 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 812 | msg = msgb_alloc(23, "rlcmac_ul_ack"); |
| 813 | if (!msg) |
| 814 | return NULL; |
| 815 | bitvec *ack_vec = bitvec_alloc(23); |
| 816 | if (!ack_vec) { |
| 817 | msgb_free(msg); |
| 818 | return NULL; |
| 819 | } |
| 820 | bitvec_unhex(ack_vec, |
| 821 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 822 | 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] | 823 | write_packet_uplink_ack(mac_control_block, tbf, final); |
| 824 | encode_gsm_rlcmac_downlink(ack_vec, mac_control_block); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 825 | bitvec_pack(ack_vec, msgb_put(msg, 23)); |
| 826 | bitvec_free(ack_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 827 | talloc_free(mac_control_block); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 828 | |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 829 | /* now we must set this flag, so we are allowed to assign downlink |
| 830 | * TBF on PACCH. it is only allowed when TLLI is aknowledged. */ |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 831 | tbf->dir.ul.contention_resolution_done = 1; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 832 | |
| 833 | if (final) { |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 834 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 835 | tbf->poll_fn = (fn + 13) % 2715648; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 836 | /* waiting for final acknowledge */ |
| 837 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK; |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 838 | tbf->dir.ul.final_ack_sent = 1; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 839 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 840 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 841 | debug_diagram(tbf->diag, "send UL-ACK"); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 842 | |
| 843 | return msg; |
| 844 | } |
| 845 | |
| 846 | /* receive UL data block |
| 847 | * |
| 848 | * The blocks are defragmented and forwarded as LLC frames, if complete. |
| 849 | */ |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 850 | int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t trx, uint8_t ts, |
Andreas Eversberg | 570b44b | 2013-03-16 16:15:01 +0100 | [diff] [blame] | 851 | uint8_t *data, uint8_t len, int8_t rssi) |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 852 | { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 853 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 854 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 855 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 856 | uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index; |
| 857 | int rc; |
| 858 | |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 859 | switch (len) { |
| 860 | case 54: |
| 861 | /* omitting spare bits */ |
| 862 | len = 53; |
| 863 | break; |
| 864 | case 40: |
| 865 | /* omitting spare bits */ |
| 866 | len = 39; |
| 867 | break; |
| 868 | case 34: |
| 869 | /* omitting spare bits */ |
| 870 | len = 33; |
| 871 | break; |
| 872 | case 23: |
| 873 | break; |
| 874 | default: |
| 875 | LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid" |
| 876 | "length: %d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 877 | return -EINVAL; |
| 878 | } |
| 879 | |
| 880 | /* find TBF inst from given TFI */ |
Holger Hans Peter Freyther | b67a8a3 | 2013-07-28 18:55:14 +0200 | [diff] [blame] | 881 | tbf = tbf_by_tfi(bts, rh->tfi, trx, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 882 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 883 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TBF=%d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 884 | rh->tfi); |
| 885 | return 0; |
| 886 | } |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 887 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_UL_DATA); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 888 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 889 | LOGP(DRLCMACUL, LOGL_DEBUG, "UL DATA TBF=%d received (V(Q)=%d .. " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 890 | "V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r); |
| 891 | |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 892 | /* process RSSI */ |
| 893 | gprs_rlcmac_rssi(tbf, rssi); |
| 894 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 895 | /* get TLLI */ |
| 896 | if (!tbf->tlli_valid) { |
Andreas Eversberg | 3a7eb6b | 2012-10-07 15:55:25 +0200 | [diff] [blame] | 897 | struct gprs_rlcmac_tbf *dl_tbf, *ul_tbf; |
Andreas Eversberg | bc65586 | 2012-07-23 18:13:31 +0200 | [diff] [blame] | 898 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 899 | /* no TLLI yet */ |
| 900 | if (!rh->ti) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 901 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d without " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 902 | "TLLI, but no TLLI received yet\n", rh->tfi); |
| 903 | return 0; |
| 904 | } |
| 905 | rc = tlli_from_ul_data(data, len, &tbf->tlli); |
| 906 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 907 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 908 | "of UL DATA TBF=%d.\n", rh->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 909 | return 0; |
| 910 | } |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 911 | LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of " |
| 912 | "UL DATA TBF=%d.\n", tbf->tlli, rh->tfi); |
Andreas Eversberg | bc65586 | 2012-07-23 18:13:31 +0200 | [diff] [blame] | 913 | if ((dl_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF))) { |
| 914 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 915 | "TLLI=0x%08x while DL TBF=%d still exists. " |
| 916 | "Killing pending DL TBF\n", tbf->tlli, |
| 917 | dl_tbf->tfi); |
| 918 | tbf_free(dl_tbf); |
| 919 | } |
Andreas Eversberg | 3a7eb6b | 2012-10-07 15:55:25 +0200 | [diff] [blame] | 920 | /* tbf_by_tlli will not find your TLLI, because it is not |
| 921 | * yet marked valid */ |
| 922 | if ((ul_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF))) { |
| 923 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 924 | "TLLI=0x%08x while UL TBF=%d still exists. " |
| 925 | "Killing pending UL TBF\n", tbf->tlli, |
| 926 | ul_tbf->tfi); |
| 927 | tbf_free(ul_tbf); |
| 928 | } |
| 929 | /* mark TLLI valid now */ |
| 930 | tbf->tlli_valid = 1; |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 931 | /* store current timing advance */ |
| 932 | remember_timing_advance(tbf->tlli, tbf->ta); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 933 | /* already have TLLI, but we stille get another one */ |
| 934 | } else if (rh->ti) { |
| 935 | uint32_t tlli; |
| 936 | rc = tlli_from_ul_data(data, len, &tlli); |
| 937 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 938 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 939 | "of UL DATA TBF=%d.\n", rh->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 940 | return 0; |
| 941 | } |
| 942 | if (tlli != tbf->tlli) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 943 | LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 944 | "DATA TBF=%d. (Ignoring due to contention " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 945 | "resolution)\n", rh->tfi); |
| 946 | return 0; |
| 947 | } |
| 948 | } |
| 949 | |
| 950 | mod_sns = tbf->sns - 1; |
| 951 | mod_sns_half = (tbf->sns >> 1) - 1; |
| 952 | |
| 953 | /* restart T3169 */ |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 954 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 955 | |
| 956 | /* Increment RX-counter */ |
| 957 | tbf->dir.ul.rx_counter++; |
| 958 | |
| 959 | /* current block relative to lowest unreceived block */ |
| 960 | offset_v_q = (rh->bsn - tbf->dir.ul.v_q) & mod_sns; |
| 961 | /* If out of window (may happen if blocks below V(Q) are received |
| 962 | * again. */ |
| 963 | if (offset_v_q >= tbf->ws) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 964 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 965 | "%d..%d (it's normal)\n", rh->bsn, tbf->dir.ul.v_q, |
| 966 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 967 | return 0; |
| 968 | } |
| 969 | /* Write block to buffer and set receive state array. */ |
| 970 | index = rh->bsn & mod_sns_half; /* memory index of block */ |
| 971 | memcpy(tbf->rlc_block[index], data, len); /* Copy block. */ |
| 972 | tbf->rlc_block_len[index] = len; |
| 973 | tbf->dir.ul.v_n[index] = 'R'; /* Mark received block. */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 974 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 975 | rh->bsn, tbf->dir.ul.v_q, |
| 976 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 977 | /* Raise V(R) to highest received sequence number not received. */ |
| 978 | offset_v_r = (rh->bsn + 1 - tbf->dir.ul.v_r) & mod_sns; |
| 979 | if (offset_v_r < (tbf->sns >> 1)) { /* Positive offset, so raise. */ |
| 980 | while (offset_v_r--) { |
| 981 | if (offset_v_r) /* all except the received block */ |
| 982 | tbf->dir.ul.v_n[tbf->dir.ul.v_r & mod_sns_half] |
| 983 | = 'N'; /* Mark block as not received */ |
| 984 | tbf->dir.ul.v_r = (tbf->dir.ul.v_r + 1) & mod_sns; |
| 985 | /* Inc V(R). */ |
| 986 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 987 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 988 | tbf->dir.ul.v_r); |
| 989 | } |
| 990 | |
| 991 | /* Raise V(Q) if possible, and retrieve LLC frames from blocks. |
| 992 | * This is looped until there is a gap (non received block) or |
| 993 | * the window is empty.*/ |
| 994 | while (tbf->dir.ul.v_q != tbf->dir.ul.v_r && tbf->dir.ul.v_n[ |
| 995 | (index = tbf->dir.ul.v_q & mod_sns_half)] == 'R') { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 996 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 997 | "V(Q) to %d\n", tbf->dir.ul.v_q, |
| 998 | (tbf->dir.ul.v_q + 1) & mod_sns); |
| 999 | /* get LLC data from block */ |
| 1000 | gprs_rlcmac_assemble_llc(tbf, tbf->rlc_block[index], |
| 1001 | tbf->rlc_block_len[index]); |
| 1002 | /* raise V(Q), because block already received */ |
| 1003 | tbf->dir.ul.v_q = (tbf->dir.ul.v_q + 1) & mod_sns; |
| 1004 | } |
| 1005 | |
| 1006 | /* Check CV of last frame in buffer */ |
| 1007 | if (tbf->state == GPRS_RLCMAC_FLOW /* still in flow state */ |
| 1008 | && tbf->dir.ul.v_q == tbf->dir.ul.v_r) { /* if complete */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1009 | struct rlc_ul_header *last_rh = (struct rlc_ul_header *) |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 1010 | tbf->rlc_block[(tbf->dir.ul.v_r - 1) & mod_sns_half]; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1011 | LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 1012 | "last block: BSN=%d CV=%d\n", last_rh->bsn, |
| 1013 | last_rh->cv); |
| 1014 | if (last_rh->cv == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1015 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 1016 | "TBF\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1017 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1018 | /* Reset N3103 counter. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 1019 | tbf->dir.ul.n3103 = 0; |
| 1020 | } |
| 1021 | } |
| 1022 | |
| 1023 | /* If TLLI is included or if we received half of the window, we send |
| 1024 | * an ack/nack */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1025 | if (rh->si || rh->ti || tbf->state == GPRS_RLCMAC_FINISHED |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1026 | || (tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1027 | if (rh->si) { |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1028 | LOGP(DRLCMACUL, LOGL_NOTICE, "- Scheduling Ack/Nack, " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1029 | "because MS is stalled.\n"); |
| 1030 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 1031 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1032 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 1033 | "because TLLI is included.\n"); |
| 1034 | } |
| 1035 | if (tbf->state == GPRS_RLCMAC_FINISHED) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1036 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 1037 | "because last block has CV==0.\n"); |
| 1038 | } |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1039 | if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1040 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 1041 | "because %d frames received.\n", |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1042 | SEND_ACK_AFTER_FRAMES); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 1043 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1044 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) { |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1045 | #ifdef DEBUG_DIAGRAM |
| 1046 | if (rh->si) |
| 1047 | debug_diagram(tbf->diag, "sched UL-ACK stall"); |
| 1048 | if (rh->ti) |
| 1049 | debug_diagram(tbf->diag, "sched UL-ACK TLLI"); |
| 1050 | if (tbf->state == GPRS_RLCMAC_FINISHED) |
| 1051 | debug_diagram(tbf->diag, "sched UL-ACK CV==0"); |
| 1052 | if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) |
| 1053 | debug_diagram(tbf->diag, "sched UL-ACK n=%d", |
| 1054 | tbf->dir.ul.rx_counter); |
| 1055 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1056 | /* trigger sending at next RTS */ |
| 1057 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 1058 | } else { |
| 1059 | /* already triggered */ |
| 1060 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Sending Ack/Nack is " |
| 1061 | "already triggered, don't schedule!\n"); |
| 1062 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 1063 | } |
| 1064 | |
| 1065 | return 0; |
| 1066 | } |
| 1067 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1068 | struct msgb *gprs_rlcmac_send_packet_uplink_assignment( |
| 1069 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 1070 | { |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1071 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1072 | struct msgb *msg; |
| 1073 | struct gprs_rlcmac_tbf *new_tbf; |
| 1074 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1075 | #if POLLING_ASSIGNMENT_UL == 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1076 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 1077 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 1078 | "sheduled for TBF=%d, so we must wait for uplink " |
| 1079 | "assignment...\n", tbf->tfi); |
| 1080 | return NULL; |
| 1081 | } |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1082 | if (sba_find(tbf->trx, tbf->control_ts, (fn + 13) % 2715648)) { |
| 1083 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already scheduled for " |
| 1084 | "single block allocation...\n"); |
| 1085 | return NULL; |
| 1086 | } |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1087 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1088 | |
| 1089 | /* on down TBF we get the uplink TBF to be assigned. */ |
| 1090 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 1091 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); |
| 1092 | else |
| 1093 | new_tbf = tbf; |
| 1094 | |
| 1095 | if (!new_tbf) { |
| 1096 | LOGP(DRLCMACUL, LOGL_ERROR, "We have a schedule for uplink " |
| 1097 | "assignment at downlink TBF=%d, but there is no uplink " |
| 1098 | "TBF\n", tbf->tfi); |
| 1099 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 1100 | return NULL; |
| 1101 | } |
| 1102 | |
| 1103 | msg = msgb_alloc(23, "rlcmac_ul_ass"); |
| 1104 | if (!msg) |
| 1105 | return NULL; |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1106 | 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] | 1107 | bitvec *ass_vec = bitvec_alloc(23); |
| 1108 | if (!ass_vec) { |
| 1109 | msgb_free(msg); |
| 1110 | return NULL; |
| 1111 | } |
| 1112 | bitvec_unhex(ass_vec, |
| 1113 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 1114 | write_packet_uplink_assignment(ass_vec, tbf->tfi, |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1115 | (tbf->direction == GPRS_RLCMAC_DL_TBF), tbf->tlli, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1116 | tbf->tlli_valid, new_tbf, POLLING_ASSIGNMENT_UL, bts->alpha, |
Andreas Eversberg | afdd9e1 | 2012-10-07 17:08:55 +0200 | [diff] [blame] | 1117 | bts->gamma, -1); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1118 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1119 | 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] | 1120 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Uplink Assignment +++++++++++++++++++++++++\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1121 | decode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1122 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 1123 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Uplink Assignment -------------------------\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1124 | bitvec_free(ass_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1125 | talloc_free(mac_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1126 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1127 | #if POLLING_ASSIGNMENT_UL == 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1128 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1129 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1130 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK; |
| 1131 | #else |
| 1132 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 1133 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 1134 | tbf_assign_control_ts(new_tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1135 | #endif |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1136 | debug_diagram(tbf->diag, "send UL-ASS"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1137 | |
| 1138 | return msg; |
| 1139 | } |
| 1140 | |
| 1141 | int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta) |
| 1142 | { |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 1143 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1144 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | 02d7cd2 | 2013-01-15 08:59:34 +0100 | [diff] [blame] | 1145 | uint8_t trx, ts = 0; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1146 | int8_t tfi; /* must be signed */ |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1147 | uint8_t sb = 0; |
| 1148 | uint32_t sb_fn = 0; |
| 1149 | int rc; |
| 1150 | uint8_t plen; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1151 | |
| 1152 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide " |
| 1153 | "one:\n"); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1154 | if ((ra & 0xf8) == 0x70) { |
| 1155 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block " |
| 1156 | "allocation\n"); |
| 1157 | sb = 1; |
| 1158 | } else if (bts->force_two_phase) { |
| 1159 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single phase access, " |
| 1160 | "but we force two phase access\n"); |
| 1161 | sb = 1; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1162 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1163 | if (qta < 0) |
| 1164 | qta = 0; |
| 1165 | if (qta > 252) |
| 1166 | qta = 252; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1167 | if (sb) { |
| 1168 | rc = sba_alloc(&trx, &ts, &sb_fn, qta >> 2); |
| 1169 | if (rc < 0) |
| 1170 | return rc; |
| 1171 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] RACH qbit-ta=%d " |
| 1172 | "ra=0x%02x, Fn=%d (%d,%d,%d)\n", qta, ra, Fn, |
| 1173 | (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); |
| 1174 | LOGP(DRLCMAC, LOGL_INFO, "TX: Immediate Assignment Uplink " |
| 1175 | "(AGCH)\n"); |
| 1176 | } else { |
| 1177 | // Create new TBF |
Holger Hans Peter Freyther | bcafdf8 | 2013-08-24 21:13:31 +0200 | [diff] [blame^] | 1178 | #warning "Copy and pate with other routines.." |
Holger Hans Peter Freyther | d6bd91e | 2013-08-24 21:16:55 +0200 | [diff] [blame] | 1179 | tfi = tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &trx, -1); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1180 | if (tfi < 0) { |
| 1181 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 1182 | /* FIXME: send reject */ |
| 1183 | return -EBUSY; |
| 1184 | } |
| 1185 | /* set class to 0, since we don't know the multislot class yet */ |
Holger Hans Peter Freyther | b67a8a3 | 2013-07-28 18:55:14 +0200 | [diff] [blame] | 1186 | tbf = tbf_alloc(bts, NULL, GPRS_RLCMAC_UL_TBF, tfi, trx, 0, 1); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1187 | if (!tbf) { |
| 1188 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 1189 | /* FIXME: send reject */ |
| 1190 | return -EBUSY; |
| 1191 | } |
| 1192 | tbf->ta = qta >> 2; |
| 1193 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 1194 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH); |
| 1195 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
| 1196 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] START TFI: %u\n", |
| 1197 | tbf->tfi); |
| 1198 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u RACH " |
| 1199 | "qbit-ta=%d ra=0x%02x, Fn=%d (%d,%d,%d)\n", tbf->tfi, |
| 1200 | qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); |
| 1201 | LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u Immediate " |
| 1202 | "Assignment Uplink (AGCH)\n", tbf->tfi); |
| 1203 | } |
Andreas Eversberg | 7b04501 | 2012-07-05 07:38:49 +0200 | [diff] [blame] | 1204 | bitvec *immediate_assignment = bitvec_alloc(22) /* without plen */; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1205 | bitvec_unhex(immediate_assignment, |
| 1206 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 1207 | if (sb) |
| 1208 | plen = write_immediate_assignment(immediate_assignment, 0, ra, |
| 1209 | Fn, qta >> 2, bts->trx[trx].arfcn, ts, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1210 | bts->trx[trx].pdch[ts].tsc, 0, 0, 0, 0, sb_fn, 1, |
Andreas Eversberg | afdd9e1 | 2012-10-07 17:08:55 +0200 | [diff] [blame] | 1211 | bts->alpha, bts->gamma, -1); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1212 | else |
| 1213 | plen = write_immediate_assignment(immediate_assignment, 0, ra, |
| 1214 | Fn, tbf->ta, tbf->arfcn, tbf->first_ts, tbf->tsc, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1215 | tbf->tfi, tbf->dir.ul.usf[tbf->first_ts], 0, 0, 0, 0, |
Andreas Eversberg | afdd9e1 | 2012-10-07 17:08:55 +0200 | [diff] [blame] | 1216 | bts->alpha, bts->gamma, -1); |
Andreas Eversberg | 7b04501 | 2012-07-05 07:38:49 +0200 | [diff] [blame] | 1217 | pcu_l1if_tx_agch(immediate_assignment, plen); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1218 | bitvec_free(immediate_assignment); |
| 1219 | |
| 1220 | return 0; |
| 1221 | } |
| 1222 | |
| 1223 | |
| 1224 | /* |
| 1225 | * DL data block flow |
| 1226 | */ |
| 1227 | |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1228 | static struct msgb *llc_dequeue(struct gprs_rlcmac_tbf *tbf) |
| 1229 | { |
| 1230 | struct msgb *msg; |
| 1231 | struct timeval *tv, tv_now; |
| 1232 | uint32_t octets = 0, frames = 0; |
| 1233 | |
| 1234 | gettimeofday(&tv_now, NULL); |
| 1235 | |
| 1236 | while ((msg = msgb_dequeue(&tbf->llc_queue))) { |
| 1237 | tv = (struct timeval *)msg->data; |
| 1238 | msgb_pull(msg, sizeof(*tv)); |
| 1239 | if (tv->tv_sec /* not infinite */ |
| 1240 | && (tv_now.tv_sec > tv->tv_sec /* and secs expired */ |
| 1241 | || (tv_now.tv_sec == tv->tv_sec /* .. or if secs equal .. */ |
| 1242 | && tv_now.tv_usec > tv->tv_usec))) { /* .. usecs expired */ |
| 1243 | LOGP(DRLCMACDL, LOGL_NOTICE, "Discarding LLC PDU of " |
| 1244 | "DL TBF=%d, because lifetime limit reached\n", |
| 1245 | tbf->tfi); |
| 1246 | frames++; |
| 1247 | octets += msg->len; |
| 1248 | msgb_free(msg); |
| 1249 | continue; |
| 1250 | } |
| 1251 | break; |
| 1252 | } |
| 1253 | |
| 1254 | if (frames) { |
| 1255 | if (frames > 0xff) |
| 1256 | frames = 0xff; |
| 1257 | if (octets > 0xffffff) |
| 1258 | octets = 0xffffff; |
Holger Hans Peter Freyther | 90692f9 | 2013-07-13 12:51:16 +0200 | [diff] [blame] | 1259 | bssgp_tx_llc_discarded(gprs_bssgp_pcu_current_bctx(), |
| 1260 | tbf->tlli, frames, octets); |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1261 | } |
| 1262 | |
| 1263 | return msg; |
| 1264 | } |
| 1265 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1266 | /* send DL data block |
| 1267 | * |
| 1268 | * The messages are fragmented and forwarded as data blocks. |
| 1269 | */ |
| 1270 | struct msgb *gprs_rlcmac_send_data_block_acknowledged( |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 1271 | struct gprs_rlcmac_tbf *tbf, uint32_t fn, uint8_t ts) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1272 | { |
| 1273 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 1274 | struct rlc_dl_header *rh; |
| 1275 | struct rlc_li_field *li; |
| 1276 | uint8_t block_length; /* total length of block, including spare bits */ |
| 1277 | uint8_t block_data; /* usable data of block, w/o spare bits, inc. MAC */ |
| 1278 | struct msgb *msg, *dl_msg; |
| 1279 | uint8_t bsn; |
| 1280 | uint16_t mod_sns = tbf->sns - 1; |
| 1281 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 1282 | uint16_t index; |
| 1283 | uint8_t *delimiter, *data, *e_pointer; |
| 1284 | uint8_t len; |
| 1285 | uint16_t space, chunk; |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1286 | int first_fin_ack = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1287 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1288 | LOGP(DRLCMACDL, LOGL_DEBUG, "DL DATA TBF=%d downlink (V(A)==%d .. " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1289 | "V(S)==%d)\n", tbf->tfi, tbf->dir.dl.v_a, tbf->dir.dl.v_s); |
| 1290 | |
| 1291 | do_resend: |
| 1292 | /* check if there is a block with negative acknowledgement */ |
| 1293 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1294 | bsn = (bsn + 1) & mod_sns) { |
| 1295 | index = (bsn & mod_sns_half); |
| 1296 | if (tbf->dir.dl.v_b[index] == 'N' |
| 1297 | || tbf->dir.dl.v_b[index] == 'X') { |
| 1298 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", |
| 1299 | bsn); |
| 1300 | /* re-send block with negative aknowlegement */ |
| 1301 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 1302 | goto tx_block; |
| 1303 | } |
| 1304 | } |
| 1305 | |
| 1306 | /* if the window has stalled, or transfer is complete, |
| 1307 | * send an unacknowledged block */ |
| 1308 | if (tbf->state == GPRS_RLCMAC_FINISHED |
| 1309 | || ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns) == tbf->ws) { |
| 1310 | int resend = 0; |
| 1311 | |
| 1312 | if (tbf->state == GPRS_RLCMAC_FINISHED) |
| 1313 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 1314 | "because all blocks have been transmitted.\n", |
| 1315 | tbf->dir.dl.v_a); |
| 1316 | else |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1317 | LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1318 | "because all window is stalled.\n", |
| 1319 | tbf->dir.dl.v_a); |
| 1320 | /* If V(S) == V(A) and finished state, we would have received |
| 1321 | * acknowledgement of all transmitted block. In this case we |
| 1322 | * would have transmitted the final block, and received ack |
| 1323 | * from MS. But in this case we did not receive the final ack |
| 1324 | * indication from MS. This should never happen if MS works |
| 1325 | * correctly. */ |
| 1326 | if (tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1327 | LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks, " |
| 1328 | "so we re-transmit final block!\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1329 | /* we just send final block again */ |
| 1330 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 1331 | goto tx_block; |
| 1332 | } |
| 1333 | |
| 1334 | /* cycle through all unacked blocks */ |
| 1335 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1336 | bsn = (bsn + 1) & mod_sns) { |
| 1337 | index = (bsn & mod_sns_half); |
| 1338 | if (tbf->dir.dl.v_b[index] == 'U') { |
| 1339 | /* mark to be re-send */ |
| 1340 | tbf->dir.dl.v_b[index] = 'X'; |
| 1341 | resend++; |
| 1342 | } |
| 1343 | } |
| 1344 | /* At this point there should be at leasst one unacked block |
| 1345 | * to be resent. If not, this is an software error. */ |
| 1346 | if (resend == 0) { |
| 1347 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 1348 | "There are no unacknowledged blocks, but V(A) " |
| 1349 | " != V(S). PLEASE FIX!\n"); |
| 1350 | /* we just send final block again */ |
| 1351 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 1352 | goto tx_block; |
| 1353 | } |
| 1354 | goto do_resend; |
| 1355 | } |
| 1356 | |
| 1357 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n", |
| 1358 | tbf->dir.dl.v_s); |
| 1359 | |
| 1360 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 1361 | index = tbf->dir.dl.v_s & mod_sns_half; |
| 1362 | data = tbf->rlc_block[index]; |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 1363 | if (tbf->cs == 0) { |
Andreas Eversberg | 499ff41 | 2012-10-03 14:21:36 +0200 | [diff] [blame] | 1364 | tbf->cs = bts->initial_cs_dl; |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 1365 | if (tbf->cs < 1 || tbf->cs > 4) |
| 1366 | tbf->cs = 1; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1367 | } |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 1368 | block_length = gprs_rlcmac_cs[tbf->cs].block_length; |
| 1369 | block_data = gprs_rlcmac_cs[tbf->cs].block_data; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1370 | memset(data, 0x2b, block_data); /* spare bits will be left 0 */ |
| 1371 | rh = (struct rlc_dl_header *)data; |
| 1372 | rh->pt = 0; /* Data Block */ |
| 1373 | rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */ |
| 1374 | rh->usf = 7; /* will be set at scheduler */ |
| 1375 | rh->pr = 0; /* FIXME: power reduction */ |
| 1376 | rh->tfi = tbf->tfi; /* TFI */ |
| 1377 | rh->fbi = 0; /* Final Block Indicator, set late, if true */ |
| 1378 | rh->bsn = tbf->dir.dl.v_s; /* Block Sequence Number */ |
| 1379 | rh->e = 0; /* Extension bit, maybe set later */ |
| 1380 | e_pointer = data + 2; /* points to E of current chunk */ |
| 1381 | data += 3; |
| 1382 | delimiter = data; /* where next length header would be stored */ |
| 1383 | space = block_data - 3; |
| 1384 | while (1) { |
| 1385 | chunk = tbf->llc_length - tbf->llc_index; |
| 1386 | /* if chunk will exceed block limit */ |
| 1387 | if (chunk > space) { |
| 1388 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1389 | "larger than space (%d) left in block: copy " |
| 1390 | "only remaining space, and we are done\n", |
| 1391 | chunk, space); |
| 1392 | /* block is filled, so there is no extension */ |
| 1393 | *e_pointer |= 0x01; |
| 1394 | /* fill only space */ |
| 1395 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1396 | /* incement index */ |
| 1397 | tbf->llc_index += space; |
| 1398 | /* return data block as message */ |
| 1399 | break; |
| 1400 | } |
| 1401 | /* if FINAL chunk would fit precisely in space left */ |
| 1402 | if (chunk == space && llist_empty(&tbf->llc_queue)) { |
| 1403 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1404 | "would exactly fit into space (%d): because " |
| 1405 | "this is a final block, we don't add length " |
| 1406 | "header, and we are done\n", chunk, space); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1407 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for " |
| 1408 | "TBF=%d that fits precisely in last block: " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1409 | "len=%d\n", tbf->tfi, tbf->llc_length); |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1410 | gprs_rlcmac_dl_bw(tbf, tbf->llc_length); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1411 | /* block is filled, so there is no extension */ |
| 1412 | *e_pointer |= 0x01; |
| 1413 | /* fill space */ |
| 1414 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1415 | /* reset LLC frame */ |
| 1416 | tbf->llc_index = tbf->llc_length = 0; |
| 1417 | /* final block */ |
| 1418 | rh->fbi = 1; /* we indicate final block */ |
| 1419 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1420 | /* return data block as message */ |
| 1421 | break; |
| 1422 | } |
| 1423 | /* if chunk would fit exactly in space left */ |
| 1424 | if (chunk == space) { |
| 1425 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1426 | "would exactly fit into space (%d): add length " |
| 1427 | "header with LI=0, to make frame extend to " |
| 1428 | "next block, and we are done\n", chunk, space); |
| 1429 | /* make space for delimiter */ |
| 1430 | if (delimiter != data) |
| 1431 | memcpy(delimiter + 1, delimiter, |
| 1432 | data - delimiter); |
| 1433 | data++; |
| 1434 | space--; |
| 1435 | /* add LI with 0 length */ |
| 1436 | li = (struct rlc_li_field *)delimiter; |
| 1437 | li->e = 1; /* not more extension */ |
| 1438 | li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| 1439 | li->li = 0; /* chunk fills the complete space */ |
| 1440 | // no need to set e_pointer nor increase delimiter |
| 1441 | /* fill only space, which is 1 octet less than chunk */ |
| 1442 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1443 | /* incement index */ |
| 1444 | tbf->llc_index += space; |
| 1445 | /* return data block as message */ |
| 1446 | break; |
| 1447 | } |
| 1448 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 1449 | "than remaining space (%d): add length header to " |
| 1450 | "to delimit LLC frame\n", chunk, space); |
| 1451 | /* the LLC frame chunk ends in this block */ |
| 1452 | /* make space for delimiter */ |
| 1453 | if (delimiter != data) |
| 1454 | memcpy(delimiter + 1, delimiter, data - delimiter); |
| 1455 | data++; |
| 1456 | space--; |
| 1457 | /* add LI to delimit frame */ |
| 1458 | li = (struct rlc_li_field *)delimiter; |
| 1459 | li->e = 0; /* Extension bit, maybe set later */ |
| 1460 | li->m = 0; /* will be set later, if there is more LLC data */ |
| 1461 | li->li = chunk; /* length of chunk */ |
| 1462 | e_pointer = delimiter; /* points to E of current delimiter */ |
| 1463 | delimiter++; |
| 1464 | /* copy (rest of) LLC frame to space */ |
| 1465 | memcpy(data, tbf->llc_frame + tbf->llc_index, chunk); |
| 1466 | data += chunk; |
| 1467 | space -= chunk; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1468 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for TBF=%d: " |
| 1469 | "len=%d\n", tbf->tfi, tbf->llc_length); |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1470 | gprs_rlcmac_dl_bw(tbf, tbf->llc_length); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1471 | /* reset LLC frame */ |
| 1472 | tbf->llc_index = tbf->llc_length = 0; |
| 1473 | /* dequeue next LLC frame, if any */ |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1474 | msg = llc_dequeue(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1475 | if (msg) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1476 | LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC for " |
| 1477 | "TBF=%d (len=%d)\n", tbf->tfi, msg->len); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1478 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1479 | tbf->llc_length = msg->len; |
| 1480 | msgb_free(msg); |
| 1481 | } |
| 1482 | /* if we have more data and we have space left */ |
| 1483 | if (space > 0 && tbf->llc_length) { |
| 1484 | li->m = 1; /* we indicate more frames to follow */ |
| 1485 | continue; |
| 1486 | } |
| 1487 | /* if we don't have more LLC frames */ |
| 1488 | if (!tbf->llc_length) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1489 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1490 | "done.\n"); |
| 1491 | li->e = 1; /* we cannot extend */ |
| 1492 | rh->fbi = 1; /* we indicate final block */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1493 | first_fin_ack = 1; |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1494 | /* + 1 indicates: first final ack */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1495 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1496 | break; |
| 1497 | } |
| 1498 | /* we have no space left */ |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1499 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1500 | "done.\n"); |
| 1501 | li->e = 1; /* we cannot extend */ |
| 1502 | break; |
| 1503 | } |
| 1504 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n", |
| 1505 | osmo_hexdump(tbf->rlc_block[index], block_length)); |
| 1506 | tbf->rlc_block_len[index] = block_length; |
| 1507 | /* raise send state and set ack state array */ |
| 1508 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 1509 | tbf->dir.dl.v_s = (tbf->dir.dl.v_s + 1) & mod_sns; /* inc send state */ |
| 1510 | |
| 1511 | tx_block: |
| 1512 | /* from this point on, new block is sent or old block is resent */ |
| 1513 | |
| 1514 | /* get data and header from current block */ |
| 1515 | data = tbf->rlc_block[index]; |
| 1516 | len = tbf->rlc_block_len[index]; |
| 1517 | rh = (struct rlc_dl_header *)data; |
| 1518 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1519 | /* Clear Polling, if still set in history buffer */ |
| 1520 | rh->s_p = 0; |
| 1521 | |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1522 | /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| 1523 | */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1524 | if (tbf->dir.dl.tx_counter >= POLL_ACK_AFTER_FRAMES || first_fin_ack) { |
| 1525 | if (first_fin_ack) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1526 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1527 | "polling, because first final block sent.\n"); |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1528 | } else { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1529 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 1530 | "polling, because %d blocks sent.\n", |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1531 | POLL_ACK_AFTER_FRAMES); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1532 | } |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1533 | /* scheduling not possible, because: */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1534 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1535 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1536 | "sheduled for TBF=%d, so we must wait for " |
| 1537 | "requesting downlink ack\n", tbf->tfi); |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1538 | else if (tbf->control_ts != ts) |
| 1539 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 1540 | "sheduled in this TS %d, waiting for " |
| 1541 | "TS %d\n", ts, tbf->control_ts); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1542 | else if (sba_find(tbf->trx, ts, (fn + 13) % 2715648)) |
| 1543 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 1544 | "sheduled, because single block alllocation " |
| 1545 | "already exists\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1546 | else { |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1547 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling sheduled in this " |
| 1548 | "TS %d\n", ts); |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1549 | tbf->dir.dl.tx_counter = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1550 | /* start timer whenever we send the final block */ |
| 1551 | if (rh->fbi == 1) |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 1552 | tbf_timer_start(tbf, 3191, bts->t3191, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1553 | |
| 1554 | /* schedule polling */ |
| 1555 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1556 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1557 | |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1558 | #ifdef DEBUG_DIAGRAM |
| 1559 | debug_diagram(tbf->diag, "poll DL-ACK"); |
| 1560 | if (first_fin_ack) |
| 1561 | debug_diagram(tbf->diag, "(is first FINAL)"); |
| 1562 | if (rh->fbi) |
| 1563 | debug_diagram(tbf->diag, "(FBI is set)"); |
| 1564 | #endif |
| 1565 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1566 | /* set polling in header */ |
| 1567 | rh->rrbp = 0; /* N+13 */ |
| 1568 | rh->s_p = 1; /* Polling */ |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1569 | |
| 1570 | /* Increment TX-counter */ |
| 1571 | tbf->dir.dl.tx_counter++; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1572 | } |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1573 | } else { |
| 1574 | /* Increment TX-counter */ |
| 1575 | tbf->dir.dl.tx_counter++; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1576 | } |
| 1577 | |
| 1578 | /* return data block as message */ |
| 1579 | dl_msg = msgb_alloc(len, "rlcmac_dl_data"); |
| 1580 | if (!dl_msg) |
| 1581 | return NULL; |
| 1582 | memcpy(msgb_put(dl_msg, len), data, len); |
| 1583 | |
| 1584 | return dl_msg; |
| 1585 | } |
| 1586 | |
| 1587 | int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final, |
| 1588 | uint8_t ssn, uint8_t *rbb) |
| 1589 | { |
| 1590 | char show_rbb[65], show_v_b[RLC_MAX_SNS + 1]; |
| 1591 | uint16_t mod_sns = tbf->sns - 1; |
| 1592 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 1593 | int i; /* must be signed */ |
| 1594 | int16_t dist; /* must be signed */ |
| 1595 | uint8_t bit; |
| 1596 | uint16_t bsn; |
| 1597 | struct msgb *msg; |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1598 | uint16_t lost = 0, received = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1599 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1600 | LOGP(DRLCMACDL, LOGL_DEBUG, "TBF=%d downlink acknowledge\n", |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1601 | tbf->tfi); |
| 1602 | |
| 1603 | if (!final) { |
| 1604 | /* show received array in debug (bit 64..1) */ |
| 1605 | for (i = 63; i >= 0; i--) { |
| 1606 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1607 | show_rbb[i] = (bit) ? '1' : 'o'; |
| 1608 | } |
| 1609 | show_rbb[64] = '\0'; |
| 1610 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1611 | "(BSN=%d) 1=ACK o=NACK\n", (ssn - 64) & mod_sns, |
| 1612 | show_rbb, (ssn - 1) & mod_sns); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1613 | |
| 1614 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 1615 | /* calculate distance of ssn from V(S) */ |
| 1616 | dist = (tbf->dir.dl.v_s - ssn) & mod_sns; |
| 1617 | /* check if distance is less than distance V(A)..V(S) */ |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1618 | if (dist >= ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns)) { |
Andreas Eversberg | 0f13c40 | 2012-07-16 11:59:23 +0200 | [diff] [blame] | 1619 | /* this might happpen, if the downlink assignment |
| 1620 | * was not received by ms and the ack refers |
| 1621 | * to previous TBF |
| 1622 | * FIXME: we should implement polling for |
| 1623 | * control ack!*/ |
| 1624 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 1625 | "V(A)..V(S) range (DL TBF=%d) Free TFB!\n", |
| 1626 | tbf->tfi); |
| 1627 | return 1; /* indicate to free TBF */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1628 | } |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1629 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
| 1630 | for (i = 63, bsn = (ssn - 1) & mod_sns; |
| 1631 | i >= 0 && bsn != ((tbf->dir.dl.v_a - 1) & mod_sns); |
| 1632 | i--, bsn = (bsn - 1) & mod_sns) { |
| 1633 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1634 | if (bit) { |
| 1635 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1636 | "ack for BSN=%d\n", bsn); |
| 1637 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] |
| 1638 | != 'A') |
| 1639 | received++; |
| 1640 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'A'; |
| 1641 | } else { |
| 1642 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1643 | "NACK for BSN=%d\n", bsn); |
| 1644 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'N'; |
| 1645 | lost++; |
| 1646 | } |
| 1647 | } |
| 1648 | /* report lost and received packets */ |
| 1649 | gprs_rlcmac_received_lost(tbf, received, lost); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1650 | |
| 1651 | /* raise V(A), if possible */ |
| 1652 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1653 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1654 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] == 'A') { |
| 1655 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'I'; |
| 1656 | /* mark invalid */ |
| 1657 | tbf->dir.dl.v_a = (tbf->dir.dl.v_a + 1) |
| 1658 | & mod_sns; |
| 1659 | } else |
| 1660 | break; |
| 1661 | } |
| 1662 | |
| 1663 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 1664 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1665 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1666 | show_v_b[i] = tbf->dir.dl.v_b[bsn & mod_sns_half]; |
| 1667 | if (show_v_b[i] == 0) |
| 1668 | show_v_b[i] = ' '; |
| 1669 | } |
| 1670 | show_v_b[i] = '\0'; |
| 1671 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 1672 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 1673 | "X=Resend-Unacked\n", tbf->dir.dl.v_a, show_v_b, |
| 1674 | (tbf->dir.dl.v_s - 1) & mod_sns); |
| 1675 | |
Andreas Eversberg | 6664a90 | 2012-07-15 06:52:19 +0200 | [diff] [blame] | 1676 | if (tbf->state == GPRS_RLCMAC_FINISHED |
| 1677 | && tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1678 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 1679 | "all blocks, but without final ack " |
| 1680 | "inidcation (don't worry)\n"); |
| 1681 | } |
| 1682 | return 0; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1683 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1684 | |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1685 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 1686 | debug_diagram(tbf->diag, "got Final ACK"); |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1687 | /* range V(A)..V(S)-1 */ |
| 1688 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1689 | bsn = (bsn + 1) & mod_sns) { |
| 1690 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] != 'A') |
| 1691 | received++; |
| 1692 | } |
| 1693 | |
| 1694 | /* report all outstanding packets as received */ |
| 1695 | gprs_rlcmac_received_lost(tbf, received, lost); |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1696 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1697 | /* check for LLC PDU in the LLC Queue */ |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1698 | msg = llc_dequeue(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1699 | if (!msg) { |
| 1700 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 1701 | |
| 1702 | /* no message, start T3193, change state to RELEASE */ |
| 1703 | LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we " |
| 1704 | "release.\n"); |
Andreas Eversberg | b3c6f6c | 2012-07-06 07:40:08 +0200 | [diff] [blame] | 1705 | /* start T3193 */ |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1706 | debug_diagram(tbf->diag, "start T3193"); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 1707 | tbf_timer_start(tbf, 3193, bts->t3193_msec / 1000, |
Andreas Eversberg | df4d20e | 2012-09-24 13:49:38 +0200 | [diff] [blame] | 1708 | (bts->t3193_msec % 1000) * 1000); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1709 | tbf_new_state(tbf, GPRS_RLCMAC_WAIT_RELEASE); |
| 1710 | |
| 1711 | return 0; |
| 1712 | } |
| 1713 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1714 | tbf->llc_length = msg->len; |
| 1715 | msgb_free(msg); |
| 1716 | |
| 1717 | /* we have a message, so we trigger downlink assignment, and there |
| 1718 | * set the state to ASSIGN. also we set old_downlink, because we |
| 1719 | * re-use this tbf. */ |
| 1720 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, " |
| 1721 | "because another LLC PDU has arrived in between\n"); |
| 1722 | memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); /* reset RLC states */ |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1723 | tbf->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; /* keep TO flags */ |
| 1724 | tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 1725 | tbf_update(tbf); |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1726 | gprs_rlcmac_trigger_downlink_assignment(tbf, tbf, NULL); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1727 | |
| 1728 | return 0; |
| 1729 | } |
| 1730 | |
| 1731 | |
| 1732 | struct msgb *gprs_rlcmac_send_packet_downlink_assignment( |
| 1733 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 1734 | { |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1735 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1736 | struct msgb *msg; |
| 1737 | struct gprs_rlcmac_tbf *new_tbf; |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1738 | int poll_ass_dl = POLLING_ASSIGNMENT_DL; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1739 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1740 | if (poll_ass_dl && tbf->direction == GPRS_RLCMAC_DL_TBF |
| 1741 | && tbf->control_ts != tbf->first_common_ts) { |
| 1742 | LOGP(DRLCMAC, LOGL_NOTICE, "Cannot poll for downlink " |
Andreas Eversberg | f01929b | 2012-10-08 12:40:49 +0200 | [diff] [blame] | 1743 | "assigment, because MS cannot reply. (control TS=%d, " |
| 1744 | "first common TS=%d)\n", tbf->control_ts, |
| 1745 | tbf->first_common_ts); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1746 | poll_ass_dl = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1747 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1748 | if (poll_ass_dl) { |
| 1749 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 1750 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already sheduled " |
| 1751 | "for TBF=%d, so we must wait for downlink " |
| 1752 | "assignment...\n", tbf->tfi); |
| 1753 | return NULL; |
| 1754 | } |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1755 | if (sba_find(tbf->trx, tbf->control_ts, (fn + 13) % 2715648)) { |
| 1756 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 1757 | "scheduled for single block allocation...\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1758 | return NULL; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1759 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1760 | } |
| 1761 | |
| 1762 | /* on uplink TBF we get the downlink TBF to be assigned. */ |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1763 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| 1764 | /* be sure to check first, if contention resolution is done, |
| 1765 | * otherwise we cannot send the assignment yet */ |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 1766 | if (!tbf->dir.ul.contention_resolution_done) { |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1767 | LOGP(DRLCMAC, LOGL_DEBUG, "Cannot assign DL TBF now, " |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1768 | "because contention resolution is not " |
| 1769 | "finished.\n"); |
| 1770 | return NULL; |
| 1771 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1772 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF); |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1773 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1774 | new_tbf = tbf; |
| 1775 | if (!new_tbf) { |
| 1776 | LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink " |
| 1777 | "assignment at uplink TBF=%d, but there is no downlink " |
| 1778 | "TBF\n", tbf->tfi); |
| 1779 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1780 | return NULL; |
| 1781 | } |
| 1782 | |
| 1783 | msg = msgb_alloc(23, "rlcmac_dl_ass"); |
| 1784 | if (!msg) |
| 1785 | return NULL; |
| 1786 | bitvec *ass_vec = bitvec_alloc(23); |
| 1787 | if (!ass_vec) { |
| 1788 | msgb_free(msg); |
| 1789 | return NULL; |
| 1790 | } |
| 1791 | bitvec_unhex(ass_vec, |
| 1792 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1793 | 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] | 1794 | 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] | 1795 | write_packet_downlink_assignment(mac_control_block, tbf->tfi, |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1796 | (tbf->direction == GPRS_RLCMAC_DL_TBF), new_tbf, |
Andreas Eversberg | afdd9e1 | 2012-10-07 17:08:55 +0200 | [diff] [blame] | 1797 | poll_ass_dl, bts->alpha, bts->gamma, -1, 0); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1798 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n"); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 1799 | encode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1800 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 1801 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Downlink Assignment -------------------------\n"); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 1802 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1803 | bitvec_free(ass_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1804 | talloc_free(mac_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1805 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1806 | if (poll_ass_dl) { |
| 1807 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1808 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1809 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; |
| 1810 | } else { |
| 1811 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1812 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 1813 | tbf_assign_control_ts(new_tbf); |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 1814 | /* stop pending assignment timer */ |
| 1815 | tbf_timer_stop(new_tbf); |
| 1816 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1817 | } |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1818 | debug_diagram(tbf->diag, "send DL-ASS"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1819 | |
| 1820 | return msg; |
| 1821 | } |
| 1822 | |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1823 | static void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf, uint8_t poll, |
Holger Hans Peter Freyther | 52c911b | 2013-08-24 18:30:54 +0200 | [diff] [blame] | 1824 | const char *imsi) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1825 | { |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1826 | struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| 1827 | int plen; |
| 1828 | |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1829 | debug_diagram(tbf->diag, "IMM.ASS (PCH)"); |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1830 | 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] | 1831 | bitvec *immediate_assignment = bitvec_alloc(22); /* without plen */ |
| 1832 | bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1833 | /* use request reference that has maximum distance to current time, |
| 1834 | * so the assignment will not conflict with possible RACH requests. */ |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1835 | plen = write_immediate_assignment(immediate_assignment, 1, 125, |
| 1836 | (tbf->pdch[tbf->first_ts]->last_rts_fn + 21216) % 2715648, tbf->ta, |
| 1837 | tbf->arfcn, tbf->first_ts, tbf->tsc, tbf->tfi, 0, tbf->tlli, poll, |
Andreas Eversberg | afdd9e1 | 2012-10-07 17:08:55 +0200 | [diff] [blame] | 1838 | tbf->poll_fn, 0, bts->alpha, bts->gamma, -1); |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1839 | pcu_l1if_tx_pch(immediate_assignment, plen, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1840 | bitvec_free(immediate_assignment); |
| 1841 | } |
| 1842 | |
| 1843 | /* depending on the current TBF, we assign on PACCH or AGCH */ |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1844 | void gprs_rlcmac_trigger_downlink_assignment(struct gprs_rlcmac_tbf *tbf, |
Holger Hans Peter Freyther | 52c911b | 2013-08-24 18:30:54 +0200 | [diff] [blame] | 1845 | struct gprs_rlcmac_tbf *old_tbf, const char *imsi) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1846 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1847 | #ifdef DEBUG_DL_ASS_IDLE |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1848 | strncpy(debug_imsi, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1849 | LOGP(DRLCMAC, LOGL_ERROR, "**** DEBUGGING DOWNLINK ASSIGNMENT ****\n"); |
| 1850 | #endif |
| 1851 | |
| 1852 | /* stop pending timer */ |
| 1853 | tbf_timer_stop(tbf); |
| 1854 | |
| 1855 | /* check for downlink tbf: */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1856 | if (old_tbf) { |
| 1857 | #ifdef DEBUG_DL_ASS_IDLE |
| 1858 | LOGP(DRLCMAC, LOGL_ERROR, "We must wait for current TBF to be " |
| 1859 | "released.\n"); |
| 1860 | /* wait one second until assignment */ |
| 1861 | tbf_timer_start(tbf, 1234, 1,0); |
| 1862 | #else |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1863 | LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment on " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1864 | "PACCH, because %s TBF=%d exists for TLLI=0x%08x\n", |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1865 | (old_tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 1866 | ? "UL" : "DL", old_tbf->tfi, old_tbf->tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1867 | old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
| 1868 | /* use TA from old TBF */ |
| 1869 | tbf->ta = old_tbf->ta; |
| 1870 | /* change state */ |
| 1871 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 1872 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1873 | /* start timer */ |
| 1874 | tbf_timer_start(tbf, 0, Tassign_pacch); |
| 1875 | #endif |
| 1876 | } else { |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1877 | LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment for TBF=%d on PCH, no TBF exist (IMSI=%s)\n", tbf->tfi, imsi); |
| 1878 | if (!imsi || strlen(imsi) < 3) { |
| 1879 | LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI!\n"); |
| 1880 | return; |
| 1881 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1882 | /* change state */ |
| 1883 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 1884 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1885 | strncpy(tbf->dir.dl.imsi, imsi, sizeof(tbf->dir.dl.imsi)); |
Andreas Eversberg | 7438df7 | 2012-07-23 18:04:49 +0200 | [diff] [blame] | 1886 | /* send immediate assignment */ |
| 1887 | gprs_rlcmac_downlink_assignment(tbf, 0, imsi); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1888 | tbf->dir.dl.wait_confirm = 1; |
| 1889 | } |
| 1890 | } |
| 1891 | |
| 1892 | int gprs_rlcmac_imm_ass_cnf(uint8_t *data, uint32_t fn) |
| 1893 | { |
| 1894 | struct gprs_rlcmac_tbf *tbf; |
| 1895 | uint8_t plen; |
| 1896 | uint32_t tlli; |
| 1897 | |
| 1898 | /* move to IA Rest Octets */ |
| 1899 | plen = data[0] >> 2; |
| 1900 | data += 1 + plen; |
| 1901 | |
| 1902 | if ((*data & 0xf0) != 0xd0) { |
| 1903 | LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but rest " |
| 1904 | "octets do not start with bit sequence 'HH01' " |
| 1905 | "(Packet Downlink Assignment)\n"); |
| 1906 | return -EINVAL; |
| 1907 | } |
| 1908 | |
| 1909 | /* get TLLI from downlink assignment */ |
| 1910 | tlli = (*data++) << 28; |
| 1911 | tlli |= (*data++) << 20; |
| 1912 | tlli |= (*data++) << 12; |
| 1913 | tlli |= (*data++) << 4; |
| 1914 | tlli |= (*data++) >> 4; |
| 1915 | |
| 1916 | tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF); |
| 1917 | if (!tbf) { |
| 1918 | LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but TLLI=%08x " |
| 1919 | "does not exit\n", tlli); |
| 1920 | return -EINVAL; |
| 1921 | } |
| 1922 | |
| 1923 | LOGP(DRLCMAC, LOGL_DEBUG, "Got IMM.ASS confirm for TLLI=%08x\n", tlli); |
| 1924 | |
| 1925 | if (tbf->dir.dl.wait_confirm) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1926 | tbf_timer_start(tbf, 0, Tassign_agch); |
| 1927 | } |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1928 | |
| 1929 | return 0; |
| 1930 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1931 | |