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> |
Holger Hans Peter Freyther | 67ed34e | 2013-10-17 17:01:54 +0200 | [diff] [blame] | 24 | #include <bts.h> |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 25 | #include <encoding.h> |
Holger Hans Peter Freyther | 8692128 | 2013-08-24 21:26:42 +0200 | [diff] [blame] | 26 | #include <tbf.h> |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 27 | |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 28 | extern void *tall_pcu_ctx; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 29 | |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 30 | extern "C" { |
| 31 | int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, |
| 32 | uint8_t num_frames, uint32_t num_octets); |
| 33 | } |
| 34 | |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 35 | /* After receiving these frames, we send ack/nack. */ |
| 36 | #define SEND_ACK_AFTER_FRAMES 20 |
| 37 | |
| 38 | /* After sending these frames, we poll for ack/nack. */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 39 | #define POLL_ACK_AFTER_FRAMES 20 |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 40 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 41 | /* If acknowledgement to uplink/downlink assignmentshould be polled */ |
| 42 | #define POLLING_ASSIGNMENT_DL 1 |
| 43 | #define POLLING_ASSIGNMENT_UL 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 44 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 45 | extern "C" { |
| 46 | /* TS 04.60 10.2.2 */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 47 | struct rlc_ul_header { |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 48 | uint8_t r:1, |
| 49 | si:1, |
| 50 | cv:4, |
| 51 | pt:2; |
| 52 | uint8_t ti:1, |
| 53 | tfi:5, |
| 54 | pi:1, |
| 55 | spare:1; |
| 56 | uint8_t e:1, |
| 57 | bsn:7; |
| 58 | } __attribute__ ((packed)); |
| 59 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 60 | struct rlc_dl_header { |
| 61 | uint8_t usf:3, |
| 62 | s_p:1, |
| 63 | rrbp:2, |
| 64 | pt:2; |
| 65 | uint8_t fbi:1, |
| 66 | tfi:5, |
| 67 | pr:2; |
| 68 | uint8_t e:1, |
| 69 | bsn:7; |
| 70 | } __attribute__ ((packed)); |
| 71 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 72 | struct rlc_li_field { |
| 73 | uint8_t e:1, |
| 74 | m:1, |
| 75 | li:6; |
| 76 | } __attribute__ ((packed)); |
| 77 | } |
| 78 | |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 79 | static void gprs_rlcmac_downlink_assignment(struct gprs_rlcmac_bts *bts, |
| 80 | gprs_rlcmac_tbf *tbf, uint8_t poll, |
Holger Hans Peter Freyther | 52c911b | 2013-08-24 18:30:54 +0200 | [diff] [blame] | 81 | const char *imsi); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 82 | |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 83 | static int gprs_rlcmac_diag(struct gprs_rlcmac_tbf *tbf) |
| 84 | { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 85 | return tbf->rlcmac_diag(); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 86 | } |
| 87 | |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 88 | int gprs_rlcmac_poll_timeout(struct gprs_rlcmac_bts *bts, struct gprs_rlcmac_tbf *tbf) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 89 | { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 90 | LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for %s TBF=%d\n", |
| 91 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 92 | |
| 93 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 94 | |
| 95 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 96 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { |
| 97 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 98 | "PACKET CONTROL ACK for PACKET UPLINK ACK\n"); |
| 99 | gprs_rlcmac_diag(tbf); |
| 100 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); |
| 101 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 102 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 103 | debug_diagram(tbf->diag, "timeout UL-ACK"); |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 104 | if (tbf->state_is(GPRS_RLCMAC_FINISHED)) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 105 | tbf->dir.ul.n3103++; |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 106 | if (tbf->dir.ul.n3103 == bts->n3103) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 107 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 108 | "- N3103 exceeded\n"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 109 | debug_diagram(tbf->diag, "N3103 exceeded"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 110 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 111 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 112 | return 0; |
| 113 | } |
| 114 | /* reschedule UL ack */ |
| 115 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 116 | } |
| 117 | } else |
| 118 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 119 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| 120 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 121 | "PACKET CONTROL ACK for PACKET UPLINK " |
| 122 | "ASSIGNMENT.\n"); |
| 123 | gprs_rlcmac_diag(tbf); |
| 124 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| 125 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 126 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 127 | debug_diagram(tbf->diag, "timeout UL-ASS"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 128 | tbf->n3105++; |
| 129 | if (tbf->n3105 == bts->n3105) { |
| 130 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 131 | debug_diagram(tbf->diag, "N3105 exceeded"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 132 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 133 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 134 | return 0; |
| 135 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 136 | /* reschedule UL assignment */ |
| 137 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 138 | } else |
| 139 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 140 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| 141 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 142 | "PACKET CONTROL ACK for PACKET DOWNLINK " |
| 143 | "ASSIGNMENT.\n"); |
| 144 | gprs_rlcmac_diag(tbf); |
| 145 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| 146 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 147 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 148 | debug_diagram(tbf->diag, "timeout DL-ASS"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 149 | tbf->n3105++; |
| 150 | if (tbf->n3105 == bts->n3105) { |
| 151 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 152 | debug_diagram(tbf->diag, "N3105 exceeded"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 153 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
| 154 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
| 155 | return 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 156 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 157 | /* reschedule DL assignment */ |
| 158 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 159 | } else |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 160 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 161 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| 162 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 163 | "PACKET DOWNLINK ACK.\n"); |
| 164 | gprs_rlcmac_diag(tbf); |
| 165 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 166 | } |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 167 | debug_diagram(tbf->diag, "timeout DL-ACK"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 168 | tbf->n3105++; |
| 169 | if (tbf->n3105 == bts->n3105) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 170 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 171 | debug_diagram(tbf->diag, "N3105 exceeded"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 172 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
| 173 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
| 174 | return 0; |
| 175 | } |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 176 | /* resend IMM.ASS on CCCH on timeout */ |
| 177 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)) |
| 178 | && !(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) { |
| 179 | LOGP(DRLCMAC, LOGL_DEBUG, "Re-send dowlink assignment " |
| 180 | "for TBF=%d on PCH (IMSI=%s)\n", tbf->tfi, |
| 181 | tbf->dir.dl.imsi); |
| 182 | /* send immediate assignment */ |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 183 | gprs_rlcmac_downlink_assignment(bts, tbf, 0, tbf->dir.dl.imsi); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 184 | tbf->dir.dl.wait_confirm = 1; |
| 185 | } |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 186 | } else |
| 187 | LOGP(DRLCMAC, LOGL_ERROR, "- Poll Timeout, but no event!\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 188 | |
| 189 | return 0; |
| 190 | } |
| 191 | |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 192 | int gprs_rlcmac_sba_timeout(struct gprs_rlcmac_sba *sba) |
| 193 | { |
| 194 | LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for SBA\n"); |
| 195 | llist_del(&sba->list); |
| 196 | talloc_free(sba); |
| 197 | |
| 198 | return 0; |
| 199 | } |
| 200 | |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 201 | static uint8_t get_ms_class_by_capability(MS_Radio_Access_capability_t *cap) |
| 202 | { |
| 203 | int i; |
| 204 | |
| 205 | for (i = 0; i < cap->Count_MS_RA_capability_value; i++) { |
| 206 | if (!cap->MS_RA_capability_value[i].u.Content.Exist_Multislot_capability) |
| 207 | continue; |
| 208 | if (!cap->MS_RA_capability_value[i].u.Content.Multislot_capability.Exist_GPRS_multislot_class) |
| 209 | continue; |
| 210 | return cap->MS_RA_capability_value[i].u.Content.Multislot_capability.GPRS_multislot_class; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | /* Received Uplink RLC control block. */ |
Holger Hans Peter Freyther | 8d7a632 | 2013-10-17 15:23:49 +0200 | [diff] [blame] | 217 | int gprs_rlcmac_rcv_control_block(struct gprs_rlcmac_bts *bts, |
| 218 | bitvec *rlc_block, uint8_t trx, uint8_t ts, |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 219 | uint32_t fn) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 220 | { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 221 | int8_t tfi = 0; /* must be signed */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 222 | uint32_t tlli = 0; |
| 223 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 224 | struct gprs_rlcmac_sba *sba; |
Andreas Eversberg | 0f13c40 | 2012-07-16 11:59:23 +0200 | [diff] [blame] | 225 | int rc; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 226 | |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 227 | 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] | 228 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 229 | decode_gsm_rlcmac_uplink(rlc_block, ul_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 230 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 231 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 232 | switch (ul_control_block->u.MESSAGE_TYPE) { |
| 233 | case MT_PACKET_CONTROL_ACK: |
| 234 | tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 235 | tbf = tbf_by_poll_fn(fn, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 236 | if (!tbf) { |
| 237 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 238 | "unknown FN=%u TLL=0x%08x (TRX %d TS %d)\n", |
| 239 | fn, tlli, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 240 | break; |
| 241 | } |
| 242 | tfi = tbf->tfi; |
| 243 | if (tlli != tbf->tlli) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 244 | LOGP(DRLCMAC, LOGL_INFO, "Phone changed TLLI to " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 245 | "0x%08x\n", tlli); |
| 246 | tbf->tlli = tlli; |
| 247 | } |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 248 | 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] | 249 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 250 | |
| 251 | /* check if this control ack belongs to packet uplink ack */ |
| 252 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 253 | 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] | 254 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 255 | debug_diagram(tbf->diag, "got CTL-ACK (fin)"); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 256 | if ((tbf->state_flags & |
| 257 | (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { |
| 258 | tbf->state_flags &= |
| 259 | ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); |
| 260 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 261 | "ack for UL TBF=%d\n", tbf->tfi); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 262 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 263 | tbf_free(tbf); |
| 264 | break; |
| 265 | } |
| 266 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 267 | 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] | 268 | /* reset N3105 */ |
| 269 | tbf->n3105 = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 270 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 271 | debug_diagram(tbf->diag, "got CTL-ACK DL-ASS"); |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 272 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 273 | tbf = tbf_by_tlli(tbf->tlli, |
| 274 | GPRS_RLCMAC_DL_TBF); |
| 275 | if (!tbf) { |
| 276 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL " |
| 277 | "TBF is gone\n"); |
| 278 | break; |
| 279 | } |
| 280 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 281 | /* stop pending assignment timer */ |
| 282 | tbf_timer_stop(tbf); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 283 | if ((tbf->state_flags & |
| 284 | (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| 285 | tbf->state_flags &= |
| 286 | ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| 287 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink " |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 288 | "assignment for DL TBF=%d\n", tbf->tfi); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 289 | } |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 290 | tbf_assign_control_ts(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 291 | break; |
| 292 | } |
| 293 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 294 | 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] | 295 | /* reset N3105 */ |
| 296 | tbf->n3105 = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 297 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 298 | debug_diagram(tbf->diag, "got CTL-AC UL-ASS"); |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 299 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 300 | tbf = tbf_by_tlli(tbf->tlli, |
| 301 | GPRS_RLCMAC_UL_TBF); |
| 302 | if (!tbf) { |
| 303 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL " |
| 304 | "TBF is gone\n"); |
| 305 | break; |
| 306 | } |
| 307 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 308 | if ((tbf->state_flags & |
| 309 | (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| 310 | tbf->state_flags &= |
| 311 | ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| 312 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 313 | "assignment for UL TBF=%d\n", tbf->tfi); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 314 | } |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 315 | tbf_assign_control_ts(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 316 | break; |
| 317 | } |
| 318 | LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK " |
| 319 | "at no request\n"); |
| 320 | break; |
| 321 | case MT_PACKET_DOWNLINK_ACK_NACK: |
| 322 | tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 323 | tbf = tbf_by_poll_fn(fn, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 324 | if (!tbf) { |
| 325 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
Andreas Eversberg | aafcd70 | 2012-10-07 15:33:31 +0200 | [diff] [blame] | 326 | "unknown FN=%u TFI=%d (TRX %d TS %d)\n", |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 327 | fn, tfi, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 328 | break; |
| 329 | } |
Andreas Eversberg | aafcd70 | 2012-10-07 15:33:31 +0200 | [diff] [blame] | 330 | if (tbf->tfi != tfi) { |
| 331 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
| 332 | "wrong TFI=%d, ignoring!\n", tfi); |
| 333 | break; |
| 334 | } |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 335 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK); |
| 336 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| 337 | tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
Andreas Eversberg | aafcd70 | 2012-10-07 15:33:31 +0200 | [diff] [blame] | 338 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink ack " |
| 339 | "for DL TBF=%d\n", tbf->tfi); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 340 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 341 | /* reset N3105 */ |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 342 | tbf->n3105 = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 343 | /* stop timer T3191 */ |
| 344 | tbf_timer_stop(tbf); |
| 345 | tlli = tbf->tlli; |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 346 | 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] | 347 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 348 | debug_diagram(tbf->diag, "got DL-ACK"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 349 | |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 350 | rc = gprs_rlcmac_downlink_ack(bts, tbf, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 351 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.FINAL_ACK_INDICATION, |
| 352 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER, |
| 353 | 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] | 354 | if (rc == 1) { |
| 355 | tbf_free(tbf); |
| 356 | break; |
| 357 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 358 | /* check for channel request */ |
| 359 | 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] | 360 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack " |
| 361 | "message, so we provide one:\n"); |
Holger Hans Peter Freyther | 96efa70 | 2013-09-29 07:44:39 +0200 | [diff] [blame] | 362 | tbf_alloc_ul(bts, tbf->trx_no, tbf->ms_class, tbf->tlli, tbf->ta, tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 363 | /* schedule uplink assignment */ |
| 364 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
| 365 | } |
| 366 | break; |
| 367 | case MT_PACKET_RESOURCE_REQUEST: |
| 368 | if (ul_control_block->u.Packet_Resource_Request.ID.UnionType) { |
| 369 | tlli = ul_control_block->u.Packet_Resource_Request.ID.u.TLLI; |
| 370 | tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | 99a107d | 2012-09-27 09:21:52 +0200 | [diff] [blame] | 371 | if (tbf) { |
| 372 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 373 | "TLLI=0x%08x while UL TBF=%d still " |
| 374 | "exists. Killing pending DL TBF\n", |
| 375 | tlli, tbf->tfi); |
| 376 | tbf_free(tbf); |
| 377 | tbf = NULL; |
| 378 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 379 | if (!tbf) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 380 | uint8_t ms_class = 0; |
Andreas Eversberg | 99a107d | 2012-09-27 09:21:52 +0200 | [diff] [blame] | 381 | struct gprs_rlcmac_tbf *dl_tbf; |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 382 | uint8_t ta; |
Andreas Eversberg | 99a107d | 2012-09-27 09:21:52 +0200 | [diff] [blame] | 383 | |
| 384 | if ((dl_tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF))) { |
| 385 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 386 | "TLLI=0x%08x while DL TBF=%d still exists. " |
| 387 | "Killing pending DL TBF\n", tlli, |
| 388 | dl_tbf->tfi); |
| 389 | tbf_free(dl_tbf); |
| 390 | } |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 391 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF " |
| 392 | "in packet ressource request of single " |
| 393 | "block, so we provide one:\n"); |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 394 | sba = sba_find(trx, ts, fn); |
| 395 | if (!sba) { |
| 396 | LOGP(DRLCMAC, LOGL_NOTICE, "MS requests UL TBF " |
| 397 | "in packet ressource request of single " |
| 398 | "block, but there is no resource request " |
| 399 | "scheduled!\n"); |
| 400 | rc = recall_timing_advance(tlli); |
| 401 | if (rc >= 0) |
| 402 | ta = rc; |
| 403 | else |
| 404 | ta = 0; |
| 405 | } else { |
| 406 | ta = sba->ta; |
| 407 | remember_timing_advance(tlli, ta); |
| 408 | llist_del(&sba->list); |
| 409 | talloc_free(sba); |
| 410 | } |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 411 | if (ul_control_block->u.Packet_Resource_Request.Exist_MS_Radio_Access_capability) |
| 412 | ms_class = get_ms_class_by_capability(&ul_control_block->u.Packet_Resource_Request.MS_Radio_Access_capability); |
| 413 | if (!ms_class) |
| 414 | LOGP(DRLCMAC, LOGL_NOTICE, "MS does not give us a class.\n"); |
Holger Hans Peter Freyther | 8692128 | 2013-08-24 21:26:42 +0200 | [diff] [blame] | 415 | tbf = tbf_alloc_ul(bts, trx, ms_class, tlli, ta, NULL); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 416 | if (!tbf) |
| 417 | break; |
| 418 | /* set control ts to current MS's TS, until assignment complete */ |
| 419 | LOGP(DRLCMAC, LOGL_DEBUG, "Change control TS to %d until assinment is complete.\n", ts); |
| 420 | tbf->control_ts = ts; |
| 421 | /* schedule uplink assignment */ |
| 422 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 423 | debug_diagram(tbf->diag, "Res. REQ"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 424 | break; |
| 425 | } |
| 426 | tfi = tbf->tfi; |
| 427 | } else { |
| 428 | if (ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.UnionType) { |
| 429 | 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] | 430 | tbf = tbf_by_tfi(bts, tfi, trx, GPRS_RLCMAC_DL_TBF); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 431 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 432 | 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] | 433 | break; |
| 434 | } |
| 435 | } else { |
| 436 | 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] | 437 | tbf = tbf_by_tfi(bts, tfi, trx, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 438 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 439 | 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] | 440 | break; |
| 441 | } |
| 442 | } |
| 443 | tlli = tbf->tlli; |
| 444 | } |
Andreas Eversberg | c8466f4 | 2012-07-15 19:34:53 +0200 | [diff] [blame] | 445 | 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] | 446 | break; |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 447 | case MT_PACKET_MEASUREMENT_REPORT: |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 448 | sba = sba_find(trx, ts, fn); |
| 449 | if (!sba) { |
| 450 | LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement " |
| 451 | "in packet ressource request of single " |
| 452 | "block, but there is no resource request " |
| 453 | "scheduled!\n"); |
| 454 | } else { |
| 455 | remember_timing_advance(ul_control_block->u.Packet_Measurement_Report.TLLI, sba->ta); |
| 456 | llist_del(&sba->list); |
| 457 | talloc_free(sba); |
| 458 | } |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 459 | gprs_rlcmac_meas_rep(&ul_control_block->u.Packet_Measurement_Report); |
| 460 | break; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 461 | default: |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 462 | LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] unknown control block received\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 463 | } |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 464 | talloc_free(ul_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 465 | return 1; |
| 466 | } |
| 467 | |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 468 | #ifdef DEBUG_DL_ASS_IDLE |
| 469 | char debug_imsi[16]; |
| 470 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 471 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 472 | /* |
| 473 | * UL data block flow |
| 474 | */ |
| 475 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 476 | /* get TLLI from received UL data block */ |
| 477 | static int tlli_from_ul_data(uint8_t *data, uint8_t len, uint32_t *tlli) |
| 478 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 479 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 480 | struct rlc_li_field *li; |
| 481 | uint8_t e; |
Andreas Eversberg | 106ea79 | 2012-11-04 12:55:16 +0100 | [diff] [blame] | 482 | uint32_t _tlli; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 483 | |
| 484 | if (!rh->ti) |
| 485 | return -EINVAL; |
| 486 | |
| 487 | data += 3; |
| 488 | len -= 3; |
| 489 | e = rh->e; |
| 490 | /* if E is not set (LI follows) */ |
| 491 | while (!e) { |
| 492 | if (!len) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 493 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA LI extended, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 494 | "but no more data\n"); |
| 495 | return -EINVAL; |
| 496 | } |
| 497 | /* get new E */ |
| 498 | li = (struct rlc_li_field *)data; |
| 499 | if (li->e == 0) /* if LI==0, E is interpreted as '1' */ |
| 500 | e = 1; |
| 501 | else |
| 502 | e = li->e; |
| 503 | data++; |
| 504 | len--; |
| 505 | } |
| 506 | if (len < 4) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 507 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of frame " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 508 | "border\n"); |
| 509 | return -EINVAL; |
| 510 | } |
Andreas Eversberg | 106ea79 | 2012-11-04 12:55:16 +0100 | [diff] [blame] | 511 | memcpy(&_tlli, data, 4); |
| 512 | *tlli = ntohl(_tlli); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 513 | |
| 514 | return 0; |
| 515 | } |
| 516 | |
| 517 | /* Store received block data in LLC message(s) and forward to SGSN if complete. |
| 518 | */ |
| 519 | static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data, |
| 520 | uint8_t len) |
| 521 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 522 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 523 | uint8_t e, m; |
| 524 | struct rlc_li_field *li; |
| 525 | uint8_t frame_offset[16], offset = 0, chunk; |
| 526 | int i, frames = 0; |
| 527 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 528 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 529 | |
| 530 | data += 3; |
| 531 | len -= 3; |
| 532 | e = rh->e; /* if extended */ |
| 533 | m = 1; /* more frames, that means: the first frame */ |
| 534 | |
| 535 | /* Parse frame offsets from length indicator(s), if any. */ |
| 536 | while (1) { |
| 537 | if (frames == (int)sizeof(frame_offset)) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 538 | LOGP(DRLCMACUL, LOGL_ERROR, "Too many frames in " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 539 | "block\n"); |
| 540 | return -EINVAL; |
| 541 | } |
| 542 | frame_offset[frames++] = offset; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 543 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 544 | "%d\n", frames, offset); |
| 545 | if (!len) |
| 546 | break; |
| 547 | /* M == 0 and E == 0 is not allowed in this version. */ |
| 548 | if (!m && !e) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 549 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 550 | "ignored, because M='0' and E='0'.\n", |
| 551 | tbf->tfi); |
| 552 | return 0; |
| 553 | } |
| 554 | /* no more frames in this segment */ |
| 555 | if (e) { |
| 556 | break; |
| 557 | } |
| 558 | /* There is a new frame and an LI that delimits it. */ |
| 559 | if (m) { |
| 560 | li = (struct rlc_li_field *)data; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 561 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n", |
| 562 | li->li); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 563 | /* Special case: LI == 0 |
| 564 | * If the last segment would fit precisely into the |
| 565 | * rest of the RLC MAC block, there would be no way |
| 566 | * to delimit that this segment ends and is not |
| 567 | * continued in the next block. |
| 568 | * The special LI (0) is used to force the segment to |
| 569 | * extend into the next block, so it is delimited there. |
| 570 | * This LI must be skipped. Also it is the last LI. |
| 571 | */ |
| 572 | if (li->li == 0) { |
| 573 | data++; |
| 574 | len--; |
| 575 | m = 1; /* M is ignored, we know there is more */ |
| 576 | break; /* handle E as '1', so we break! */ |
| 577 | } |
| 578 | e = li->e; |
| 579 | m = li->m; |
| 580 | offset += li->li; |
| 581 | data++; |
| 582 | len--; |
| 583 | continue; |
| 584 | } |
| 585 | } |
| 586 | if (!m) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 587 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 588 | "data\n"); |
| 589 | } |
| 590 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 591 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 592 | len); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 593 | /* TLLI */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 594 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 595 | if (len < 4) { |
| 596 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of " |
| 597 | "frame border\n"); |
| 598 | return -EINVAL; |
| 599 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 600 | data += 4; |
| 601 | len -= 4; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 602 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: " |
| 603 | "%d\n", len); |
| 604 | } |
| 605 | |
| 606 | /* PFI */ |
| 607 | if (rh->pi) { |
| 608 | LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, " |
| 609 | "please disable in SYSTEM INFORMATION\n"); |
| 610 | if (len < 1) { |
| 611 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA PFI out of " |
| 612 | "frame border\n"); |
| 613 | return -EINVAL; |
| 614 | } |
| 615 | data++; |
| 616 | len--; |
| 617 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 618 | "%d\n", len); |
| 619 | } |
| 620 | |
| 621 | /* Now we have: |
| 622 | * - a list of frames offsets: frame_offset[] |
| 623 | * - number of frames: i |
| 624 | * - m == 0: Last frame carries spare data (end of TBF). |
| 625 | */ |
| 626 | |
| 627 | /* Check if last offset would exceed frame. */ |
| 628 | if (offset > len) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 629 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d ignored, " |
| 630 | "because LI delimits data that exceeds block size.\n", |
| 631 | tbf->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 632 | return -EINVAL; |
| 633 | } |
| 634 | |
| 635 | /* create LLC frames */ |
| 636 | for (i = 0; i < frames; i++) { |
| 637 | /* last frame ? */ |
| 638 | if (i == frames - 1) { |
| 639 | /* no more data in last frame */ |
| 640 | if (!m) |
| 641 | break; |
| 642 | /* data until end of frame */ |
| 643 | chunk = len - frame_offset[i]; |
| 644 | } else { |
| 645 | /* data until next frame */ |
| 646 | chunk = frame_offset[i + 1] - frame_offset[i]; |
| 647 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 648 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 649 | "frame at %d.\n", chunk, tbf->llc_index); |
| 650 | if (tbf->llc_index + chunk > LLC_MAX_LEN) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 651 | LOGP(DRLCMACUL, LOGL_NOTICE, "LLC frame exceeds " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 652 | "maximum size.\n"); |
| 653 | chunk = LLC_MAX_LEN - tbf->llc_index; |
| 654 | } |
| 655 | memcpy(tbf->llc_frame + tbf->llc_index, data + frame_offset[i], |
| 656 | chunk); |
| 657 | tbf->llc_index += chunk; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 658 | /* not last frame. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 659 | if (i != frames - 1) { |
| 660 | /* send frame to SGSN */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 661 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 662 | "TBF=%d: len=%d\n", tbf->tfi, tbf->llc_index); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 663 | gprs_rlcmac_tx_ul_ud(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 664 | tbf->llc_index = 0; /* reset frame space */ |
| 665 | /* also check if CV==0, because the frame may fill up the |
| 666 | * block precisely, then it is also complete. normally the |
| 667 | * frame would be extended into the next block with a 0-length |
| 668 | * delimiter added to this block. */ |
| 669 | } else if (rh->cv == 0) { |
| 670 | /* send frame to SGSN */ |
| 671 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 672 | "TBF=%d that fits precisely in last block: " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 673 | "len=%d\n", tbf->tfi, tbf->llc_index); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 674 | gprs_rlcmac_tx_ul_ud(tbf); |
| 675 | tbf->llc_index = 0; /* reset frame space */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 676 | } |
| 677 | } |
| 678 | |
| 679 | return 0; |
| 680 | } |
| 681 | |
Holger Hans Peter Freyther | ae947fc | 2013-10-17 13:29:03 +0200 | [diff] [blame] | 682 | struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_bts *bts, |
| 683 | struct gprs_rlcmac_tbf *tbf, |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 684 | uint32_t fn) |
| 685 | { |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 686 | int final = (tbf->state_is(GPRS_RLCMAC_FINISHED)); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 687 | struct msgb *msg; |
| 688 | |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 689 | if (final) { |
| 690 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 691 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 692 | "sheduled for TBF=%d, so we must wait for " |
| 693 | "final uplink ack...\n", tbf->tfi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 694 | return NULL; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 695 | } |
Holger Hans Peter Freyther | 96efa70 | 2013-09-29 07:44:39 +0200 | [diff] [blame] | 696 | if (sba_find(tbf->trx_no, tbf->control_ts, (fn + 13) % 2715648)) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 697 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 698 | "scheduled for single block allocation...\n"); |
| 699 | return NULL; |
| 700 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 701 | } |
| 702 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 703 | msg = msgb_alloc(23, "rlcmac_ul_ack"); |
| 704 | if (!msg) |
| 705 | return NULL; |
| 706 | bitvec *ack_vec = bitvec_alloc(23); |
| 707 | if (!ack_vec) { |
| 708 | msgb_free(msg); |
| 709 | return NULL; |
| 710 | } |
| 711 | bitvec_unhex(ack_vec, |
| 712 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 713 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 714 | Encoding::write_packet_uplink_ack(bts, mac_control_block, tbf, final); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 715 | encode_gsm_rlcmac_downlink(ack_vec, mac_control_block); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 716 | bitvec_pack(ack_vec, msgb_put(msg, 23)); |
| 717 | bitvec_free(ack_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 718 | talloc_free(mac_control_block); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 719 | |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 720 | /* now we must set this flag, so we are allowed to assign downlink |
| 721 | * TBF on PACCH. it is only allowed when TLLI is aknowledged. */ |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 722 | tbf->dir.ul.contention_resolution_done = 1; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 723 | |
| 724 | if (final) { |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 725 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 726 | tbf->poll_fn = (fn + 13) % 2715648; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 727 | /* waiting for final acknowledge */ |
| 728 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK; |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 729 | tbf->dir.ul.final_ack_sent = 1; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 730 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 731 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 732 | debug_diagram(tbf->diag, "send UL-ACK"); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 733 | |
| 734 | return msg; |
| 735 | } |
| 736 | |
| 737 | /* receive UL data block |
| 738 | * |
| 739 | * The blocks are defragmented and forwarded as LLC frames, if complete. |
| 740 | */ |
Holger Hans Peter Freyther | 698b612 | 2013-10-17 13:44:18 +0200 | [diff] [blame] | 741 | int gprs_rlcmac_rcv_data_block_acknowledged(struct gprs_rlcmac_bts *bts, |
| 742 | uint8_t trx, uint8_t ts, |
Andreas Eversberg | 570b44b | 2013-03-16 16:15:01 +0100 | [diff] [blame] | 743 | uint8_t *data, uint8_t len, int8_t rssi) |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 744 | { |
| 745 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 746 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 747 | uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index; |
| 748 | int rc; |
| 749 | |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 750 | switch (len) { |
| 751 | case 54: |
| 752 | /* omitting spare bits */ |
| 753 | len = 53; |
| 754 | break; |
| 755 | case 40: |
| 756 | /* omitting spare bits */ |
| 757 | len = 39; |
| 758 | break; |
| 759 | case 34: |
| 760 | /* omitting spare bits */ |
| 761 | len = 33; |
| 762 | break; |
| 763 | case 23: |
| 764 | break; |
| 765 | default: |
| 766 | LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid" |
| 767 | "length: %d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 768 | return -EINVAL; |
| 769 | } |
| 770 | |
| 771 | /* find TBF inst from given TFI */ |
Holger Hans Peter Freyther | b67a8a3 | 2013-07-28 18:55:14 +0200 | [diff] [blame] | 772 | tbf = tbf_by_tfi(bts, rh->tfi, trx, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 773 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 774 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TBF=%d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 775 | rh->tfi); |
| 776 | return 0; |
| 777 | } |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 778 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_UL_DATA); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 779 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 780 | LOGP(DRLCMACUL, LOGL_DEBUG, "UL DATA TBF=%d received (V(Q)=%d .. " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 781 | "V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r); |
| 782 | |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 783 | /* process RSSI */ |
| 784 | gprs_rlcmac_rssi(tbf, rssi); |
| 785 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 786 | /* get TLLI */ |
| 787 | if (!tbf->tlli_valid) { |
Andreas Eversberg | 3a7eb6b | 2012-10-07 15:55:25 +0200 | [diff] [blame] | 788 | struct gprs_rlcmac_tbf *dl_tbf, *ul_tbf; |
Andreas Eversberg | bc65586 | 2012-07-23 18:13:31 +0200 | [diff] [blame] | 789 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 790 | /* no TLLI yet */ |
| 791 | if (!rh->ti) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 792 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d without " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 793 | "TLLI, but no TLLI received yet\n", rh->tfi); |
| 794 | return 0; |
| 795 | } |
| 796 | rc = tlli_from_ul_data(data, len, &tbf->tlli); |
| 797 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 798 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 799 | "of UL DATA TBF=%d.\n", rh->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 800 | return 0; |
| 801 | } |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 802 | LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of " |
| 803 | "UL DATA TBF=%d.\n", tbf->tlli, rh->tfi); |
Andreas Eversberg | bc65586 | 2012-07-23 18:13:31 +0200 | [diff] [blame] | 804 | if ((dl_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF))) { |
| 805 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 806 | "TLLI=0x%08x while DL TBF=%d still exists. " |
| 807 | "Killing pending DL TBF\n", tbf->tlli, |
| 808 | dl_tbf->tfi); |
| 809 | tbf_free(dl_tbf); |
| 810 | } |
Andreas Eversberg | 3a7eb6b | 2012-10-07 15:55:25 +0200 | [diff] [blame] | 811 | /* tbf_by_tlli will not find your TLLI, because it is not |
| 812 | * yet marked valid */ |
| 813 | if ((ul_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF))) { |
| 814 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 815 | "TLLI=0x%08x while UL TBF=%d still exists. " |
| 816 | "Killing pending UL TBF\n", tbf->tlli, |
| 817 | ul_tbf->tfi); |
| 818 | tbf_free(ul_tbf); |
| 819 | } |
| 820 | /* mark TLLI valid now */ |
| 821 | tbf->tlli_valid = 1; |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 822 | /* store current timing advance */ |
| 823 | remember_timing_advance(tbf->tlli, tbf->ta); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 824 | /* already have TLLI, but we stille get another one */ |
| 825 | } else if (rh->ti) { |
| 826 | uint32_t tlli; |
| 827 | rc = tlli_from_ul_data(data, len, &tlli); |
| 828 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 829 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 830 | "of UL DATA TBF=%d.\n", rh->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 831 | return 0; |
| 832 | } |
| 833 | if (tlli != tbf->tlli) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 834 | LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 835 | "DATA TBF=%d. (Ignoring due to contention " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 836 | "resolution)\n", rh->tfi); |
| 837 | return 0; |
| 838 | } |
| 839 | } |
| 840 | |
| 841 | mod_sns = tbf->sns - 1; |
| 842 | mod_sns_half = (tbf->sns >> 1) - 1; |
| 843 | |
| 844 | /* restart T3169 */ |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 845 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 846 | |
| 847 | /* Increment RX-counter */ |
| 848 | tbf->dir.ul.rx_counter++; |
| 849 | |
| 850 | /* current block relative to lowest unreceived block */ |
| 851 | offset_v_q = (rh->bsn - tbf->dir.ul.v_q) & mod_sns; |
| 852 | /* If out of window (may happen if blocks below V(Q) are received |
| 853 | * again. */ |
| 854 | if (offset_v_q >= tbf->ws) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 855 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 856 | "%d..%d (it's normal)\n", rh->bsn, tbf->dir.ul.v_q, |
| 857 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 858 | return 0; |
| 859 | } |
| 860 | /* Write block to buffer and set receive state array. */ |
| 861 | index = rh->bsn & mod_sns_half; /* memory index of block */ |
| 862 | memcpy(tbf->rlc_block[index], data, len); /* Copy block. */ |
| 863 | tbf->rlc_block_len[index] = len; |
| 864 | tbf->dir.ul.v_n[index] = 'R'; /* Mark received block. */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 865 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 866 | rh->bsn, tbf->dir.ul.v_q, |
| 867 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 868 | /* Raise V(R) to highest received sequence number not received. */ |
| 869 | offset_v_r = (rh->bsn + 1 - tbf->dir.ul.v_r) & mod_sns; |
| 870 | if (offset_v_r < (tbf->sns >> 1)) { /* Positive offset, so raise. */ |
| 871 | while (offset_v_r--) { |
| 872 | if (offset_v_r) /* all except the received block */ |
| 873 | tbf->dir.ul.v_n[tbf->dir.ul.v_r & mod_sns_half] |
| 874 | = 'N'; /* Mark block as not received */ |
| 875 | tbf->dir.ul.v_r = (tbf->dir.ul.v_r + 1) & mod_sns; |
| 876 | /* Inc V(R). */ |
| 877 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 878 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 879 | tbf->dir.ul.v_r); |
| 880 | } |
| 881 | |
| 882 | /* Raise V(Q) if possible, and retrieve LLC frames from blocks. |
| 883 | * This is looped until there is a gap (non received block) or |
| 884 | * the window is empty.*/ |
| 885 | while (tbf->dir.ul.v_q != tbf->dir.ul.v_r && tbf->dir.ul.v_n[ |
| 886 | (index = tbf->dir.ul.v_q & mod_sns_half)] == 'R') { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 887 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 888 | "V(Q) to %d\n", tbf->dir.ul.v_q, |
| 889 | (tbf->dir.ul.v_q + 1) & mod_sns); |
| 890 | /* get LLC data from block */ |
| 891 | gprs_rlcmac_assemble_llc(tbf, tbf->rlc_block[index], |
| 892 | tbf->rlc_block_len[index]); |
| 893 | /* raise V(Q), because block already received */ |
| 894 | tbf->dir.ul.v_q = (tbf->dir.ul.v_q + 1) & mod_sns; |
| 895 | } |
| 896 | |
| 897 | /* Check CV of last frame in buffer */ |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 898 | if (tbf->state_is(GPRS_RLCMAC_FLOW) /* still in flow state */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 899 | && tbf->dir.ul.v_q == tbf->dir.ul.v_r) { /* if complete */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 900 | struct rlc_ul_header *last_rh = (struct rlc_ul_header *) |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 901 | tbf->rlc_block[(tbf->dir.ul.v_r - 1) & mod_sns_half]; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 902 | LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 903 | "last block: BSN=%d CV=%d\n", last_rh->bsn, |
| 904 | last_rh->cv); |
| 905 | if (last_rh->cv == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 906 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 907 | "TBF\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 908 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 909 | /* Reset N3103 counter. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 910 | tbf->dir.ul.n3103 = 0; |
| 911 | } |
| 912 | } |
| 913 | |
| 914 | /* If TLLI is included or if we received half of the window, we send |
| 915 | * an ack/nack */ |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 916 | if (rh->si || rh->ti || tbf->state_is(GPRS_RLCMAC_FINISHED) |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 917 | || (tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 918 | if (rh->si) { |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 919 | LOGP(DRLCMACUL, LOGL_NOTICE, "- Scheduling Ack/Nack, " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 920 | "because MS is stalled.\n"); |
| 921 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 922 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 923 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 924 | "because TLLI is included.\n"); |
| 925 | } |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 926 | if (tbf->state_is(GPRS_RLCMAC_FINISHED)) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 927 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 928 | "because last block has CV==0.\n"); |
| 929 | } |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 930 | if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 931 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 932 | "because %d frames received.\n", |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 933 | SEND_ACK_AFTER_FRAMES); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 934 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 935 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) { |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 936 | #ifdef DEBUG_DIAGRAM |
| 937 | if (rh->si) |
| 938 | debug_diagram(tbf->diag, "sched UL-ACK stall"); |
| 939 | if (rh->ti) |
| 940 | debug_diagram(tbf->diag, "sched UL-ACK TLLI"); |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 941 | if (tbf->state_is(GPRS_RLCMAC_FINISHED)) |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 942 | debug_diagram(tbf->diag, "sched UL-ACK CV==0"); |
| 943 | if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) |
| 944 | debug_diagram(tbf->diag, "sched UL-ACK n=%d", |
| 945 | tbf->dir.ul.rx_counter); |
| 946 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 947 | /* trigger sending at next RTS */ |
| 948 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 949 | } else { |
| 950 | /* already triggered */ |
| 951 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Sending Ack/Nack is " |
| 952 | "already triggered, don't schedule!\n"); |
| 953 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 954 | } |
| 955 | |
| 956 | return 0; |
| 957 | } |
| 958 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 959 | struct msgb *gprs_rlcmac_send_packet_uplink_assignment( |
Holger Hans Peter Freyther | d507ce6 | 2013-10-17 15:32:37 +0200 | [diff] [blame] | 960 | struct gprs_rlcmac_bts *bts, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 961 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 962 | { |
| 963 | struct msgb *msg; |
| 964 | struct gprs_rlcmac_tbf *new_tbf; |
| 965 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 966 | #if POLLING_ASSIGNMENT_UL == 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 967 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 968 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 969 | "sheduled for TBF=%d, so we must wait for uplink " |
| 970 | "assignment...\n", tbf->tfi); |
| 971 | return NULL; |
| 972 | } |
Holger Hans Peter Freyther | 96efa70 | 2013-09-29 07:44:39 +0200 | [diff] [blame] | 973 | if (sba_find(tbf->trx_no, tbf->control_ts, (fn + 13) % 2715648)) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 974 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already scheduled for " |
| 975 | "single block allocation...\n"); |
| 976 | return NULL; |
| 977 | } |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 978 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 979 | |
| 980 | /* on down TBF we get the uplink TBF to be assigned. */ |
| 981 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 982 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); |
| 983 | else |
| 984 | new_tbf = tbf; |
| 985 | |
| 986 | if (!new_tbf) { |
| 987 | LOGP(DRLCMACUL, LOGL_ERROR, "We have a schedule for uplink " |
| 988 | "assignment at downlink TBF=%d, but there is no uplink " |
| 989 | "TBF\n", tbf->tfi); |
| 990 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 991 | return NULL; |
| 992 | } |
| 993 | |
| 994 | msg = msgb_alloc(23, "rlcmac_ul_ass"); |
| 995 | if (!msg) |
| 996 | return NULL; |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 997 | 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] | 998 | bitvec *ass_vec = bitvec_alloc(23); |
| 999 | if (!ass_vec) { |
| 1000 | msgb_free(msg); |
| 1001 | return NULL; |
| 1002 | } |
| 1003 | bitvec_unhex(ass_vec, |
| 1004 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 1005 | Encoding::write_packet_uplink_assignment(bts, ass_vec, tbf->tfi, |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1006 | (tbf->direction == GPRS_RLCMAC_DL_TBF), tbf->tlli, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1007 | tbf->tlli_valid, new_tbf, POLLING_ASSIGNMENT_UL, bts->alpha, |
Andreas Eversberg | afdd9e1 | 2012-10-07 17:08:55 +0200 | [diff] [blame] | 1008 | bts->gamma, -1); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1009 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1010 | 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] | 1011 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Uplink Assignment +++++++++++++++++++++++++\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1012 | decode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1013 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 1014 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Uplink Assignment -------------------------\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1015 | bitvec_free(ass_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1016 | talloc_free(mac_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1017 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1018 | #if POLLING_ASSIGNMENT_UL == 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1019 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1020 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1021 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK; |
| 1022 | #else |
| 1023 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 1024 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 1025 | tbf_assign_control_ts(new_tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1026 | #endif |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1027 | debug_diagram(tbf->diag, "send UL-ASS"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1028 | |
| 1029 | return msg; |
| 1030 | } |
| 1031 | |
Holger Hans Peter Freyther | b0250eb | 2013-10-17 13:46:19 +0200 | [diff] [blame] | 1032 | int gprs_rlcmac_rcv_rach(struct gprs_rlcmac_bts *bts, |
| 1033 | uint8_t ra, uint32_t Fn, int16_t qta) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1034 | { |
| 1035 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | 02d7cd2 | 2013-01-15 08:59:34 +0100 | [diff] [blame] | 1036 | uint8_t trx, ts = 0; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1037 | int8_t tfi; /* must be signed */ |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1038 | uint8_t sb = 0; |
| 1039 | uint32_t sb_fn = 0; |
| 1040 | int rc; |
| 1041 | uint8_t plen; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1042 | |
| 1043 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide " |
| 1044 | "one:\n"); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1045 | if ((ra & 0xf8) == 0x70) { |
| 1046 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block " |
| 1047 | "allocation\n"); |
| 1048 | sb = 1; |
| 1049 | } else if (bts->force_two_phase) { |
| 1050 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single phase access, " |
| 1051 | "but we force two phase access\n"); |
| 1052 | sb = 1; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1053 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1054 | if (qta < 0) |
| 1055 | qta = 0; |
| 1056 | if (qta > 252) |
| 1057 | qta = 252; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1058 | if (sb) { |
Holger Hans Peter Freyther | 173a240 | 2013-10-16 21:47:45 +0200 | [diff] [blame] | 1059 | rc = sba_alloc(bts, &trx, &ts, &sb_fn, qta >> 2); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1060 | if (rc < 0) |
| 1061 | return rc; |
| 1062 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] RACH qbit-ta=%d " |
| 1063 | "ra=0x%02x, Fn=%d (%d,%d,%d)\n", qta, ra, Fn, |
| 1064 | (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); |
| 1065 | LOGP(DRLCMAC, LOGL_INFO, "TX: Immediate Assignment Uplink " |
| 1066 | "(AGCH)\n"); |
| 1067 | } else { |
| 1068 | // Create new TBF |
Holger Hans Peter Freyther | bcafdf8 | 2013-08-24 21:13:31 +0200 | [diff] [blame] | 1069 | #warning "Copy and pate with other routines.." |
Holger Hans Peter Freyther | d6bd91e | 2013-08-24 21:16:55 +0200 | [diff] [blame] | 1070 | tfi = tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &trx, -1); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1071 | if (tfi < 0) { |
| 1072 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 1073 | /* FIXME: send reject */ |
| 1074 | return -EBUSY; |
| 1075 | } |
| 1076 | /* 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] | 1077 | 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] | 1078 | if (!tbf) { |
| 1079 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 1080 | /* FIXME: send reject */ |
| 1081 | return -EBUSY; |
| 1082 | } |
| 1083 | tbf->ta = qta >> 2; |
| 1084 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 1085 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH); |
| 1086 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
| 1087 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] START TFI: %u\n", |
| 1088 | tbf->tfi); |
| 1089 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u RACH " |
| 1090 | "qbit-ta=%d ra=0x%02x, Fn=%d (%d,%d,%d)\n", tbf->tfi, |
| 1091 | qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); |
| 1092 | LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u Immediate " |
| 1093 | "Assignment Uplink (AGCH)\n", tbf->tfi); |
| 1094 | } |
Andreas Eversberg | 7b04501 | 2012-07-05 07:38:49 +0200 | [diff] [blame] | 1095 | bitvec *immediate_assignment = bitvec_alloc(22) /* without plen */; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1096 | bitvec_unhex(immediate_assignment, |
| 1097 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 1098 | if (sb) |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 1099 | plen = Encoding::write_immediate_assignment(bts, immediate_assignment, 0, ra, |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1100 | Fn, qta >> 2, bts->trx[trx].arfcn, ts, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1101 | 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] | 1102 | bts->alpha, bts->gamma, -1); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1103 | else |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 1104 | plen = Encoding::write_immediate_assignment(bts, immediate_assignment, 0, ra, |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1105 | Fn, tbf->ta, tbf->arfcn, tbf->first_ts, tbf->tsc, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1106 | 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] | 1107 | bts->alpha, bts->gamma, -1); |
Andreas Eversberg | 7b04501 | 2012-07-05 07:38:49 +0200 | [diff] [blame] | 1108 | pcu_l1if_tx_agch(immediate_assignment, plen); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1109 | bitvec_free(immediate_assignment); |
| 1110 | |
| 1111 | return 0; |
| 1112 | } |
| 1113 | |
| 1114 | |
| 1115 | /* |
| 1116 | * DL data block flow |
| 1117 | */ |
| 1118 | |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1119 | static struct msgb *llc_dequeue(struct gprs_rlcmac_tbf *tbf) |
| 1120 | { |
| 1121 | struct msgb *msg; |
| 1122 | struct timeval *tv, tv_now; |
| 1123 | uint32_t octets = 0, frames = 0; |
| 1124 | |
| 1125 | gettimeofday(&tv_now, NULL); |
| 1126 | |
| 1127 | while ((msg = msgb_dequeue(&tbf->llc_queue))) { |
| 1128 | tv = (struct timeval *)msg->data; |
| 1129 | msgb_pull(msg, sizeof(*tv)); |
| 1130 | if (tv->tv_sec /* not infinite */ |
| 1131 | && (tv_now.tv_sec > tv->tv_sec /* and secs expired */ |
| 1132 | || (tv_now.tv_sec == tv->tv_sec /* .. or if secs equal .. */ |
| 1133 | && tv_now.tv_usec > tv->tv_usec))) { /* .. usecs expired */ |
| 1134 | LOGP(DRLCMACDL, LOGL_NOTICE, "Discarding LLC PDU of " |
| 1135 | "DL TBF=%d, because lifetime limit reached\n", |
| 1136 | tbf->tfi); |
| 1137 | frames++; |
| 1138 | octets += msg->len; |
| 1139 | msgb_free(msg); |
| 1140 | continue; |
| 1141 | } |
| 1142 | break; |
| 1143 | } |
| 1144 | |
| 1145 | if (frames) { |
| 1146 | if (frames > 0xff) |
| 1147 | frames = 0xff; |
| 1148 | if (octets > 0xffffff) |
| 1149 | octets = 0xffffff; |
Holger Hans Peter Freyther | 90692f9 | 2013-07-13 12:51:16 +0200 | [diff] [blame] | 1150 | bssgp_tx_llc_discarded(gprs_bssgp_pcu_current_bctx(), |
| 1151 | tbf->tlli, frames, octets); |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1152 | } |
| 1153 | |
| 1154 | return msg; |
| 1155 | } |
| 1156 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1157 | /* send DL data block |
| 1158 | * |
| 1159 | * The messages are fragmented and forwarded as data blocks. |
| 1160 | */ |
| 1161 | struct msgb *gprs_rlcmac_send_data_block_acknowledged( |
Holger Hans Peter Freyther | 4ffc260 | 2013-10-17 15:21:10 +0200 | [diff] [blame] | 1162 | struct gprs_rlcmac_bts *bts, |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 1163 | struct gprs_rlcmac_tbf *tbf, uint32_t fn, uint8_t ts) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1164 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1165 | struct rlc_dl_header *rh; |
| 1166 | struct rlc_li_field *li; |
| 1167 | uint8_t block_length; /* total length of block, including spare bits */ |
| 1168 | uint8_t block_data; /* usable data of block, w/o spare bits, inc. MAC */ |
| 1169 | struct msgb *msg, *dl_msg; |
| 1170 | uint8_t bsn; |
| 1171 | uint16_t mod_sns = tbf->sns - 1; |
| 1172 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 1173 | uint16_t index; |
| 1174 | uint8_t *delimiter, *data, *e_pointer; |
| 1175 | uint8_t len; |
| 1176 | uint16_t space, chunk; |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1177 | int first_fin_ack = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1178 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1179 | LOGP(DRLCMACDL, LOGL_DEBUG, "DL DATA TBF=%d downlink (V(A)==%d .. " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1180 | "V(S)==%d)\n", tbf->tfi, tbf->dir.dl.v_a, tbf->dir.dl.v_s); |
| 1181 | |
| 1182 | do_resend: |
| 1183 | /* check if there is a block with negative acknowledgement */ |
| 1184 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1185 | bsn = (bsn + 1) & mod_sns) { |
| 1186 | index = (bsn & mod_sns_half); |
| 1187 | if (tbf->dir.dl.v_b[index] == 'N' |
| 1188 | || tbf->dir.dl.v_b[index] == 'X') { |
| 1189 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", |
| 1190 | bsn); |
| 1191 | /* re-send block with negative aknowlegement */ |
| 1192 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 1193 | goto tx_block; |
| 1194 | } |
| 1195 | } |
| 1196 | |
| 1197 | /* if the window has stalled, or transfer is complete, |
| 1198 | * send an unacknowledged block */ |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 1199 | if (tbf->state_is(GPRS_RLCMAC_FINISHED) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1200 | || ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns) == tbf->ws) { |
| 1201 | int resend = 0; |
| 1202 | |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 1203 | if (tbf->state_is(GPRS_RLCMAC_FINISHED)) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1204 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 1205 | "because all blocks have been transmitted.\n", |
| 1206 | tbf->dir.dl.v_a); |
| 1207 | else |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1208 | LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1209 | "because all window is stalled.\n", |
| 1210 | tbf->dir.dl.v_a); |
| 1211 | /* If V(S) == V(A) and finished state, we would have received |
| 1212 | * acknowledgement of all transmitted block. In this case we |
| 1213 | * would have transmitted the final block, and received ack |
| 1214 | * from MS. But in this case we did not receive the final ack |
| 1215 | * indication from MS. This should never happen if MS works |
| 1216 | * correctly. */ |
| 1217 | if (tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1218 | LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks, " |
| 1219 | "so we re-transmit final block!\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1220 | /* we just send final block again */ |
| 1221 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 1222 | goto tx_block; |
| 1223 | } |
| 1224 | |
| 1225 | /* cycle through all unacked blocks */ |
| 1226 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1227 | bsn = (bsn + 1) & mod_sns) { |
| 1228 | index = (bsn & mod_sns_half); |
| 1229 | if (tbf->dir.dl.v_b[index] == 'U') { |
| 1230 | /* mark to be re-send */ |
| 1231 | tbf->dir.dl.v_b[index] = 'X'; |
| 1232 | resend++; |
| 1233 | } |
| 1234 | } |
| 1235 | /* At this point there should be at leasst one unacked block |
| 1236 | * to be resent. If not, this is an software error. */ |
| 1237 | if (resend == 0) { |
| 1238 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 1239 | "There are no unacknowledged blocks, but V(A) " |
| 1240 | " != V(S). PLEASE FIX!\n"); |
| 1241 | /* we just send final block again */ |
| 1242 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 1243 | goto tx_block; |
| 1244 | } |
| 1245 | goto do_resend; |
| 1246 | } |
| 1247 | |
| 1248 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n", |
| 1249 | tbf->dir.dl.v_s); |
| 1250 | |
| 1251 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 1252 | index = tbf->dir.dl.v_s & mod_sns_half; |
| 1253 | data = tbf->rlc_block[index]; |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 1254 | if (tbf->cs == 0) { |
Andreas Eversberg | 499ff41 | 2012-10-03 14:21:36 +0200 | [diff] [blame] | 1255 | tbf->cs = bts->initial_cs_dl; |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 1256 | if (tbf->cs < 1 || tbf->cs > 4) |
| 1257 | tbf->cs = 1; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1258 | } |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 1259 | block_length = gprs_rlcmac_cs[tbf->cs].block_length; |
| 1260 | block_data = gprs_rlcmac_cs[tbf->cs].block_data; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1261 | memset(data, 0x2b, block_data); /* spare bits will be left 0 */ |
| 1262 | rh = (struct rlc_dl_header *)data; |
| 1263 | rh->pt = 0; /* Data Block */ |
| 1264 | rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */ |
| 1265 | rh->usf = 7; /* will be set at scheduler */ |
| 1266 | rh->pr = 0; /* FIXME: power reduction */ |
| 1267 | rh->tfi = tbf->tfi; /* TFI */ |
| 1268 | rh->fbi = 0; /* Final Block Indicator, set late, if true */ |
| 1269 | rh->bsn = tbf->dir.dl.v_s; /* Block Sequence Number */ |
| 1270 | rh->e = 0; /* Extension bit, maybe set later */ |
| 1271 | e_pointer = data + 2; /* points to E of current chunk */ |
| 1272 | data += 3; |
| 1273 | delimiter = data; /* where next length header would be stored */ |
| 1274 | space = block_data - 3; |
| 1275 | while (1) { |
| 1276 | chunk = tbf->llc_length - tbf->llc_index; |
| 1277 | /* if chunk will exceed block limit */ |
| 1278 | if (chunk > space) { |
| 1279 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1280 | "larger than space (%d) left in block: copy " |
| 1281 | "only remaining space, and we are done\n", |
| 1282 | chunk, space); |
| 1283 | /* block is filled, so there is no extension */ |
| 1284 | *e_pointer |= 0x01; |
| 1285 | /* fill only space */ |
| 1286 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1287 | /* incement index */ |
| 1288 | tbf->llc_index += space; |
| 1289 | /* return data block as message */ |
| 1290 | break; |
| 1291 | } |
| 1292 | /* if FINAL chunk would fit precisely in space left */ |
| 1293 | if (chunk == space && llist_empty(&tbf->llc_queue)) { |
| 1294 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1295 | "would exactly fit into space (%d): because " |
| 1296 | "this is a final block, we don't add length " |
| 1297 | "header, and we are done\n", chunk, space); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1298 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for " |
| 1299 | "TBF=%d that fits precisely in last block: " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1300 | "len=%d\n", tbf->tfi, tbf->llc_length); |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1301 | gprs_rlcmac_dl_bw(tbf, tbf->llc_length); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1302 | /* block is filled, so there is no extension */ |
| 1303 | *e_pointer |= 0x01; |
| 1304 | /* fill space */ |
| 1305 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1306 | /* reset LLC frame */ |
| 1307 | tbf->llc_index = tbf->llc_length = 0; |
| 1308 | /* final block */ |
| 1309 | rh->fbi = 1; /* we indicate final block */ |
| 1310 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1311 | /* return data block as message */ |
| 1312 | break; |
| 1313 | } |
| 1314 | /* if chunk would fit exactly in space left */ |
| 1315 | if (chunk == space) { |
| 1316 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1317 | "would exactly fit into space (%d): add length " |
| 1318 | "header with LI=0, to make frame extend to " |
| 1319 | "next block, and we are done\n", chunk, space); |
| 1320 | /* make space for delimiter */ |
| 1321 | if (delimiter != data) |
| 1322 | memcpy(delimiter + 1, delimiter, |
| 1323 | data - delimiter); |
| 1324 | data++; |
| 1325 | space--; |
| 1326 | /* add LI with 0 length */ |
| 1327 | li = (struct rlc_li_field *)delimiter; |
| 1328 | li->e = 1; /* not more extension */ |
| 1329 | li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| 1330 | li->li = 0; /* chunk fills the complete space */ |
| 1331 | // no need to set e_pointer nor increase delimiter |
| 1332 | /* fill only space, which is 1 octet less than chunk */ |
| 1333 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1334 | /* incement index */ |
| 1335 | tbf->llc_index += space; |
| 1336 | /* return data block as message */ |
| 1337 | break; |
| 1338 | } |
| 1339 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 1340 | "than remaining space (%d): add length header to " |
| 1341 | "to delimit LLC frame\n", chunk, space); |
| 1342 | /* the LLC frame chunk ends in this block */ |
| 1343 | /* make space for delimiter */ |
| 1344 | if (delimiter != data) |
| 1345 | memcpy(delimiter + 1, delimiter, data - delimiter); |
| 1346 | data++; |
| 1347 | space--; |
| 1348 | /* add LI to delimit frame */ |
| 1349 | li = (struct rlc_li_field *)delimiter; |
| 1350 | li->e = 0; /* Extension bit, maybe set later */ |
| 1351 | li->m = 0; /* will be set later, if there is more LLC data */ |
| 1352 | li->li = chunk; /* length of chunk */ |
| 1353 | e_pointer = delimiter; /* points to E of current delimiter */ |
| 1354 | delimiter++; |
| 1355 | /* copy (rest of) LLC frame to space */ |
| 1356 | memcpy(data, tbf->llc_frame + tbf->llc_index, chunk); |
| 1357 | data += chunk; |
| 1358 | space -= chunk; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1359 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for TBF=%d: " |
| 1360 | "len=%d\n", tbf->tfi, tbf->llc_length); |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1361 | gprs_rlcmac_dl_bw(tbf, tbf->llc_length); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1362 | /* reset LLC frame */ |
| 1363 | tbf->llc_index = tbf->llc_length = 0; |
| 1364 | /* dequeue next LLC frame, if any */ |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1365 | msg = llc_dequeue(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1366 | if (msg) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1367 | LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC for " |
| 1368 | "TBF=%d (len=%d)\n", tbf->tfi, msg->len); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1369 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1370 | tbf->llc_length = msg->len; |
| 1371 | msgb_free(msg); |
| 1372 | } |
| 1373 | /* if we have more data and we have space left */ |
| 1374 | if (space > 0 && tbf->llc_length) { |
| 1375 | li->m = 1; /* we indicate more frames to follow */ |
| 1376 | continue; |
| 1377 | } |
| 1378 | /* if we don't have more LLC frames */ |
| 1379 | if (!tbf->llc_length) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1380 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1381 | "done.\n"); |
| 1382 | li->e = 1; /* we cannot extend */ |
| 1383 | rh->fbi = 1; /* we indicate final block */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1384 | first_fin_ack = 1; |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1385 | /* + 1 indicates: first final ack */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1386 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1387 | break; |
| 1388 | } |
| 1389 | /* we have no space left */ |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1390 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1391 | "done.\n"); |
| 1392 | li->e = 1; /* we cannot extend */ |
| 1393 | break; |
| 1394 | } |
| 1395 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n", |
| 1396 | osmo_hexdump(tbf->rlc_block[index], block_length)); |
| 1397 | tbf->rlc_block_len[index] = block_length; |
| 1398 | /* raise send state and set ack state array */ |
| 1399 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 1400 | tbf->dir.dl.v_s = (tbf->dir.dl.v_s + 1) & mod_sns; /* inc send state */ |
| 1401 | |
| 1402 | tx_block: |
| 1403 | /* from this point on, new block is sent or old block is resent */ |
| 1404 | |
| 1405 | /* get data and header from current block */ |
| 1406 | data = tbf->rlc_block[index]; |
| 1407 | len = tbf->rlc_block_len[index]; |
| 1408 | rh = (struct rlc_dl_header *)data; |
| 1409 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1410 | /* Clear Polling, if still set in history buffer */ |
| 1411 | rh->s_p = 0; |
| 1412 | |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1413 | /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| 1414 | */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1415 | if (tbf->dir.dl.tx_counter >= POLL_ACK_AFTER_FRAMES || first_fin_ack) { |
| 1416 | if (first_fin_ack) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1417 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1418 | "polling, because first final block sent.\n"); |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1419 | } else { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1420 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 1421 | "polling, because %d blocks sent.\n", |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1422 | POLL_ACK_AFTER_FRAMES); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1423 | } |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1424 | /* scheduling not possible, because: */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1425 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1426 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1427 | "sheduled for TBF=%d, so we must wait for " |
| 1428 | "requesting downlink ack\n", tbf->tfi); |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1429 | else if (tbf->control_ts != ts) |
| 1430 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 1431 | "sheduled in this TS %d, waiting for " |
| 1432 | "TS %d\n", ts, tbf->control_ts); |
Holger Hans Peter Freyther | 96efa70 | 2013-09-29 07:44:39 +0200 | [diff] [blame] | 1433 | else if (sba_find(tbf->trx_no, ts, (fn + 13) % 2715648)) |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1434 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 1435 | "sheduled, because single block alllocation " |
| 1436 | "already exists\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1437 | else { |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1438 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling sheduled in this " |
| 1439 | "TS %d\n", ts); |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1440 | tbf->dir.dl.tx_counter = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1441 | /* start timer whenever we send the final block */ |
| 1442 | if (rh->fbi == 1) |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 1443 | tbf_timer_start(tbf, 3191, bts->t3191, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1444 | |
| 1445 | /* schedule polling */ |
| 1446 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1447 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1448 | |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1449 | #ifdef DEBUG_DIAGRAM |
| 1450 | debug_diagram(tbf->diag, "poll DL-ACK"); |
| 1451 | if (first_fin_ack) |
| 1452 | debug_diagram(tbf->diag, "(is first FINAL)"); |
| 1453 | if (rh->fbi) |
| 1454 | debug_diagram(tbf->diag, "(FBI is set)"); |
| 1455 | #endif |
| 1456 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1457 | /* set polling in header */ |
| 1458 | rh->rrbp = 0; /* N+13 */ |
| 1459 | rh->s_p = 1; /* Polling */ |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1460 | |
| 1461 | /* Increment TX-counter */ |
| 1462 | tbf->dir.dl.tx_counter++; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1463 | } |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1464 | } else { |
| 1465 | /* Increment TX-counter */ |
| 1466 | tbf->dir.dl.tx_counter++; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1467 | } |
| 1468 | |
| 1469 | /* return data block as message */ |
| 1470 | dl_msg = msgb_alloc(len, "rlcmac_dl_data"); |
| 1471 | if (!dl_msg) |
| 1472 | return NULL; |
| 1473 | memcpy(msgb_put(dl_msg, len), data, len); |
| 1474 | |
| 1475 | return dl_msg; |
| 1476 | } |
| 1477 | |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 1478 | int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_bts *bts, |
| 1479 | struct gprs_rlcmac_tbf *tbf, uint8_t final, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1480 | uint8_t ssn, uint8_t *rbb) |
| 1481 | { |
| 1482 | char show_rbb[65], show_v_b[RLC_MAX_SNS + 1]; |
| 1483 | uint16_t mod_sns = tbf->sns - 1; |
| 1484 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 1485 | int i; /* must be signed */ |
| 1486 | int16_t dist; /* must be signed */ |
| 1487 | uint8_t bit; |
| 1488 | uint16_t bsn; |
| 1489 | struct msgb *msg; |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1490 | uint16_t lost = 0, received = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1491 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1492 | LOGP(DRLCMACDL, LOGL_DEBUG, "TBF=%d downlink acknowledge\n", |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1493 | tbf->tfi); |
| 1494 | |
| 1495 | if (!final) { |
| 1496 | /* show received array in debug (bit 64..1) */ |
| 1497 | for (i = 63; i >= 0; i--) { |
| 1498 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1499 | show_rbb[i] = (bit) ? '1' : 'o'; |
| 1500 | } |
| 1501 | show_rbb[64] = '\0'; |
| 1502 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1503 | "(BSN=%d) 1=ACK o=NACK\n", (ssn - 64) & mod_sns, |
| 1504 | show_rbb, (ssn - 1) & mod_sns); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1505 | |
| 1506 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 1507 | /* calculate distance of ssn from V(S) */ |
| 1508 | dist = (tbf->dir.dl.v_s - ssn) & mod_sns; |
| 1509 | /* check if distance is less than distance V(A)..V(S) */ |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1510 | 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] | 1511 | /* this might happpen, if the downlink assignment |
| 1512 | * was not received by ms and the ack refers |
| 1513 | * to previous TBF |
| 1514 | * FIXME: we should implement polling for |
| 1515 | * control ack!*/ |
| 1516 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 1517 | "V(A)..V(S) range (DL TBF=%d) Free TFB!\n", |
| 1518 | tbf->tfi); |
| 1519 | return 1; /* indicate to free TBF */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1520 | } |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1521 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
| 1522 | for (i = 63, bsn = (ssn - 1) & mod_sns; |
| 1523 | i >= 0 && bsn != ((tbf->dir.dl.v_a - 1) & mod_sns); |
| 1524 | i--, bsn = (bsn - 1) & mod_sns) { |
| 1525 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1526 | if (bit) { |
| 1527 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1528 | "ack for BSN=%d\n", bsn); |
| 1529 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] |
| 1530 | != 'A') |
| 1531 | received++; |
| 1532 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'A'; |
| 1533 | } else { |
| 1534 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1535 | "NACK for BSN=%d\n", bsn); |
| 1536 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'N'; |
| 1537 | lost++; |
| 1538 | } |
| 1539 | } |
| 1540 | /* report lost and received packets */ |
| 1541 | gprs_rlcmac_received_lost(tbf, received, lost); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1542 | |
| 1543 | /* raise V(A), if possible */ |
| 1544 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1545 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1546 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] == 'A') { |
| 1547 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'I'; |
| 1548 | /* mark invalid */ |
| 1549 | tbf->dir.dl.v_a = (tbf->dir.dl.v_a + 1) |
| 1550 | & mod_sns; |
| 1551 | } else |
| 1552 | break; |
| 1553 | } |
| 1554 | |
| 1555 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 1556 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1557 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1558 | show_v_b[i] = tbf->dir.dl.v_b[bsn & mod_sns_half]; |
| 1559 | if (show_v_b[i] == 0) |
| 1560 | show_v_b[i] = ' '; |
| 1561 | } |
| 1562 | show_v_b[i] = '\0'; |
| 1563 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 1564 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 1565 | "X=Resend-Unacked\n", tbf->dir.dl.v_a, show_v_b, |
| 1566 | (tbf->dir.dl.v_s - 1) & mod_sns); |
| 1567 | |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 1568 | if (tbf->state_is(GPRS_RLCMAC_FINISHED) |
Andreas Eversberg | 6664a90 | 2012-07-15 06:52:19 +0200 | [diff] [blame] | 1569 | && tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1570 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 1571 | "all blocks, but without final ack " |
| 1572 | "inidcation (don't worry)\n"); |
| 1573 | } |
| 1574 | return 0; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1575 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1576 | |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1577 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 1578 | debug_diagram(tbf->diag, "got Final ACK"); |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1579 | /* range V(A)..V(S)-1 */ |
| 1580 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1581 | bsn = (bsn + 1) & mod_sns) { |
| 1582 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] != 'A') |
| 1583 | received++; |
| 1584 | } |
| 1585 | |
| 1586 | /* report all outstanding packets as received */ |
| 1587 | gprs_rlcmac_received_lost(tbf, received, lost); |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1588 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1589 | /* check for LLC PDU in the LLC Queue */ |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1590 | msg = llc_dequeue(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1591 | if (!msg) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1592 | /* no message, start T3193, change state to RELEASE */ |
| 1593 | LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we " |
| 1594 | "release.\n"); |
Andreas Eversberg | b3c6f6c | 2012-07-06 07:40:08 +0200 | [diff] [blame] | 1595 | /* start T3193 */ |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1596 | debug_diagram(tbf->diag, "start T3193"); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 1597 | tbf_timer_start(tbf, 3193, bts->t3193_msec / 1000, |
Andreas Eversberg | df4d20e | 2012-09-24 13:49:38 +0200 | [diff] [blame] | 1598 | (bts->t3193_msec % 1000) * 1000); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1599 | tbf_new_state(tbf, GPRS_RLCMAC_WAIT_RELEASE); |
| 1600 | |
| 1601 | return 0; |
| 1602 | } |
| 1603 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1604 | tbf->llc_length = msg->len; |
| 1605 | msgb_free(msg); |
| 1606 | |
| 1607 | /* we have a message, so we trigger downlink assignment, and there |
| 1608 | * set the state to ASSIGN. also we set old_downlink, because we |
| 1609 | * re-use this tbf. */ |
| 1610 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, " |
| 1611 | "because another LLC PDU has arrived in between\n"); |
| 1612 | memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); /* reset RLC states */ |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1613 | tbf->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; /* keep TO flags */ |
| 1614 | tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
Holger Hans Peter Freyther | 1b33361 | 2013-10-17 18:26:33 +0200 | [diff] [blame] | 1615 | tbf_update(bts, tbf); |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 1616 | gprs_rlcmac_trigger_downlink_assignment(bts, tbf, tbf, NULL); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1617 | |
| 1618 | return 0; |
| 1619 | } |
| 1620 | |
| 1621 | |
| 1622 | struct msgb *gprs_rlcmac_send_packet_downlink_assignment( |
Holger Hans Peter Freyther | 9f521cd | 2013-10-17 13:48:11 +0200 | [diff] [blame] | 1623 | struct gprs_rlcmac_bts *bts, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1624 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 1625 | { |
| 1626 | struct msgb *msg; |
| 1627 | struct gprs_rlcmac_tbf *new_tbf; |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1628 | int poll_ass_dl = POLLING_ASSIGNMENT_DL; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1629 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1630 | if (poll_ass_dl && tbf->direction == GPRS_RLCMAC_DL_TBF |
| 1631 | && tbf->control_ts != tbf->first_common_ts) { |
| 1632 | LOGP(DRLCMAC, LOGL_NOTICE, "Cannot poll for downlink " |
Andreas Eversberg | f01929b | 2012-10-08 12:40:49 +0200 | [diff] [blame] | 1633 | "assigment, because MS cannot reply. (control TS=%d, " |
| 1634 | "first common TS=%d)\n", tbf->control_ts, |
| 1635 | tbf->first_common_ts); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1636 | poll_ass_dl = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1637 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1638 | if (poll_ass_dl) { |
| 1639 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 1640 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already sheduled " |
| 1641 | "for TBF=%d, so we must wait for downlink " |
| 1642 | "assignment...\n", tbf->tfi); |
| 1643 | return NULL; |
| 1644 | } |
Holger Hans Peter Freyther | 96efa70 | 2013-09-29 07:44:39 +0200 | [diff] [blame] | 1645 | if (sba_find(tbf->trx_no, tbf->control_ts, (fn + 13) % 2715648)) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1646 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 1647 | "scheduled for single block allocation...\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1648 | return NULL; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1649 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1650 | } |
| 1651 | |
| 1652 | /* on uplink TBF we get the downlink TBF to be assigned. */ |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1653 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| 1654 | /* be sure to check first, if contention resolution is done, |
| 1655 | * otherwise we cannot send the assignment yet */ |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 1656 | if (!tbf->dir.ul.contention_resolution_done) { |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1657 | LOGP(DRLCMAC, LOGL_DEBUG, "Cannot assign DL TBF now, " |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1658 | "because contention resolution is not " |
| 1659 | "finished.\n"); |
| 1660 | return NULL; |
| 1661 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1662 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF); |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1663 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1664 | new_tbf = tbf; |
| 1665 | if (!new_tbf) { |
| 1666 | LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink " |
| 1667 | "assignment at uplink TBF=%d, but there is no downlink " |
| 1668 | "TBF\n", tbf->tfi); |
| 1669 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1670 | return NULL; |
| 1671 | } |
| 1672 | |
| 1673 | msg = msgb_alloc(23, "rlcmac_dl_ass"); |
| 1674 | if (!msg) |
| 1675 | return NULL; |
| 1676 | bitvec *ass_vec = bitvec_alloc(23); |
| 1677 | if (!ass_vec) { |
| 1678 | msgb_free(msg); |
| 1679 | return NULL; |
| 1680 | } |
| 1681 | bitvec_unhex(ass_vec, |
| 1682 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1683 | 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] | 1684 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 1685 | Encoding::write_packet_downlink_assignment(mac_control_block, tbf->tfi, |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1686 | (tbf->direction == GPRS_RLCMAC_DL_TBF), new_tbf, |
Andreas Eversberg | afdd9e1 | 2012-10-07 17:08:55 +0200 | [diff] [blame] | 1687 | poll_ass_dl, bts->alpha, bts->gamma, -1, 0); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1688 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n"); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 1689 | encode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1690 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 1691 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Downlink Assignment -------------------------\n"); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 1692 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1693 | bitvec_free(ass_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1694 | talloc_free(mac_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1695 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1696 | if (poll_ass_dl) { |
| 1697 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1698 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1699 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; |
| 1700 | } else { |
| 1701 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1702 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 1703 | tbf_assign_control_ts(new_tbf); |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 1704 | /* stop pending assignment timer */ |
| 1705 | tbf_timer_stop(new_tbf); |
| 1706 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1707 | } |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1708 | debug_diagram(tbf->diag, "send DL-ASS"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1709 | |
| 1710 | return msg; |
| 1711 | } |
| 1712 | |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 1713 | static void gprs_rlcmac_downlink_assignment(struct gprs_rlcmac_bts *bts, |
| 1714 | gprs_rlcmac_tbf *tbf, uint8_t poll, |
Holger Hans Peter Freyther | 52c911b | 2013-08-24 18:30:54 +0200 | [diff] [blame] | 1715 | const char *imsi) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1716 | { |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1717 | int plen; |
| 1718 | |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1719 | debug_diagram(tbf->diag, "IMM.ASS (PCH)"); |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1720 | 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] | 1721 | bitvec *immediate_assignment = bitvec_alloc(22); /* without plen */ |
| 1722 | bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1723 | /* use request reference that has maximum distance to current time, |
| 1724 | * so the assignment will not conflict with possible RACH requests. */ |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 1725 | plen = Encoding::write_immediate_assignment(bts, immediate_assignment, 1, 125, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1726 | (tbf->pdch[tbf->first_ts]->last_rts_fn + 21216) % 2715648, tbf->ta, |
| 1727 | 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] | 1728 | tbf->poll_fn, 0, bts->alpha, bts->gamma, -1); |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1729 | pcu_l1if_tx_pch(immediate_assignment, plen, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1730 | bitvec_free(immediate_assignment); |
| 1731 | } |
| 1732 | |
| 1733 | /* depending on the current TBF, we assign on PACCH or AGCH */ |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 1734 | void gprs_rlcmac_trigger_downlink_assignment(struct gprs_rlcmac_bts *bts, |
| 1735 | struct gprs_rlcmac_tbf *tbf, |
Holger Hans Peter Freyther | 52c911b | 2013-08-24 18:30:54 +0200 | [diff] [blame] | 1736 | struct gprs_rlcmac_tbf *old_tbf, const char *imsi) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1737 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1738 | #ifdef DEBUG_DL_ASS_IDLE |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1739 | strncpy(debug_imsi, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1740 | LOGP(DRLCMAC, LOGL_ERROR, "**** DEBUGGING DOWNLINK ASSIGNMENT ****\n"); |
| 1741 | #endif |
| 1742 | |
| 1743 | /* stop pending timer */ |
| 1744 | tbf_timer_stop(tbf); |
| 1745 | |
| 1746 | /* check for downlink tbf: */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1747 | if (old_tbf) { |
| 1748 | #ifdef DEBUG_DL_ASS_IDLE |
| 1749 | LOGP(DRLCMAC, LOGL_ERROR, "We must wait for current TBF to be " |
| 1750 | "released.\n"); |
| 1751 | /* wait one second until assignment */ |
| 1752 | tbf_timer_start(tbf, 1234, 1,0); |
| 1753 | #else |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1754 | LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment on " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1755 | "PACCH, because %s TBF=%d exists for TLLI=0x%08x\n", |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1756 | (old_tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 1757 | ? "UL" : "DL", old_tbf->tfi, old_tbf->tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1758 | old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
| 1759 | /* use TA from old TBF */ |
| 1760 | tbf->ta = old_tbf->ta; |
| 1761 | /* change state */ |
| 1762 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 1763 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1764 | /* start timer */ |
| 1765 | tbf_timer_start(tbf, 0, Tassign_pacch); |
| 1766 | #endif |
| 1767 | } else { |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1768 | LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment for TBF=%d on PCH, no TBF exist (IMSI=%s)\n", tbf->tfi, imsi); |
| 1769 | if (!imsi || strlen(imsi) < 3) { |
| 1770 | LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI!\n"); |
| 1771 | return; |
| 1772 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1773 | /* change state */ |
| 1774 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 1775 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1776 | strncpy(tbf->dir.dl.imsi, imsi, sizeof(tbf->dir.dl.imsi)); |
Andreas Eversberg | 7438df7 | 2012-07-23 18:04:49 +0200 | [diff] [blame] | 1777 | /* send immediate assignment */ |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 1778 | gprs_rlcmac_downlink_assignment(bts, tbf, 0, imsi); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1779 | tbf->dir.dl.wait_confirm = 1; |
| 1780 | } |
| 1781 | } |
| 1782 | |
| 1783 | int gprs_rlcmac_imm_ass_cnf(uint8_t *data, uint32_t fn) |
| 1784 | { |
| 1785 | struct gprs_rlcmac_tbf *tbf; |
| 1786 | uint8_t plen; |
| 1787 | uint32_t tlli; |
| 1788 | |
| 1789 | /* move to IA Rest Octets */ |
| 1790 | plen = data[0] >> 2; |
| 1791 | data += 1 + plen; |
| 1792 | |
| 1793 | if ((*data & 0xf0) != 0xd0) { |
| 1794 | LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but rest " |
| 1795 | "octets do not start with bit sequence 'HH01' " |
| 1796 | "(Packet Downlink Assignment)\n"); |
| 1797 | return -EINVAL; |
| 1798 | } |
| 1799 | |
| 1800 | /* get TLLI from downlink assignment */ |
| 1801 | tlli = (*data++) << 28; |
| 1802 | tlli |= (*data++) << 20; |
| 1803 | tlli |= (*data++) << 12; |
| 1804 | tlli |= (*data++) << 4; |
| 1805 | tlli |= (*data++) >> 4; |
| 1806 | |
| 1807 | tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF); |
| 1808 | if (!tbf) { |
| 1809 | LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but TLLI=%08x " |
| 1810 | "does not exit\n", tlli); |
| 1811 | return -EINVAL; |
| 1812 | } |
| 1813 | |
| 1814 | LOGP(DRLCMAC, LOGL_DEBUG, "Got IMM.ASS confirm for TLLI=%08x\n", tlli); |
| 1815 | |
| 1816 | if (tbf->dir.dl.wait_confirm) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1817 | tbf_timer_start(tbf, 0, Tassign_agch); |
| 1818 | } |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1819 | |
| 1820 | return 0; |
| 1821 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1822 | |