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 | 8692128 | 2013-08-24 21:26:42 +0200 | [diff] [blame] | 25 | #include <tbf.h> |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 26 | |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 27 | extern void *tall_pcu_ctx; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 28 | |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 29 | extern "C" { |
| 30 | int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, |
| 31 | uint8_t num_frames, uint32_t num_octets); |
| 32 | } |
| 33 | |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 34 | /* After receiving these frames, we send ack/nack. */ |
| 35 | #define SEND_ACK_AFTER_FRAMES 20 |
| 36 | |
| 37 | /* After sending these frames, we poll for ack/nack. */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 38 | #define POLL_ACK_AFTER_FRAMES 20 |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 39 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 40 | /* If acknowledgement to uplink/downlink assignmentshould be polled */ |
| 41 | #define POLLING_ASSIGNMENT_DL 1 |
| 42 | #define POLLING_ASSIGNMENT_UL 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 43 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 44 | extern "C" { |
| 45 | /* TS 04.60 10.2.2 */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 46 | struct rlc_ul_header { |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 47 | uint8_t r:1, |
| 48 | si:1, |
| 49 | cv:4, |
| 50 | pt:2; |
| 51 | uint8_t ti:1, |
| 52 | tfi:5, |
| 53 | pi:1, |
| 54 | spare:1; |
| 55 | uint8_t e:1, |
| 56 | bsn:7; |
| 57 | } __attribute__ ((packed)); |
| 58 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 59 | struct rlc_dl_header { |
| 60 | uint8_t usf:3, |
| 61 | s_p:1, |
| 62 | rrbp:2, |
| 63 | pt:2; |
| 64 | uint8_t fbi:1, |
| 65 | tfi:5, |
| 66 | pr:2; |
| 67 | uint8_t e:1, |
| 68 | bsn:7; |
| 69 | } __attribute__ ((packed)); |
| 70 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 71 | struct rlc_li_field { |
| 72 | uint8_t e:1, |
| 73 | m:1, |
| 74 | li:6; |
| 75 | } __attribute__ ((packed)); |
| 76 | } |
| 77 | |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 78 | static void gprs_rlcmac_downlink_assignment(struct gprs_rlcmac_bts *bts, |
| 79 | gprs_rlcmac_tbf *tbf, uint8_t poll, |
Holger Hans Peter Freyther | 52c911b | 2013-08-24 18:30:54 +0200 | [diff] [blame] | 80 | const char *imsi); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 81 | |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 82 | static int gprs_rlcmac_diag(struct gprs_rlcmac_tbf *tbf) |
| 83 | { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 84 | return tbf->rlcmac_diag(); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 85 | } |
| 86 | |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 87 | 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] | 88 | { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 89 | LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for %s TBF=%d\n", |
| 90 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 91 | |
| 92 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 93 | |
| 94 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 95 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { |
| 96 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 97 | "PACKET CONTROL ACK for PACKET UPLINK ACK\n"); |
| 98 | gprs_rlcmac_diag(tbf); |
| 99 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); |
| 100 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 101 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 102 | debug_diagram(tbf->diag, "timeout UL-ACK"); |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 103 | if (tbf->state_is(GPRS_RLCMAC_FINISHED)) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 104 | tbf->dir.ul.n3103++; |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 105 | if (tbf->dir.ul.n3103 == bts->n3103) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 106 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 107 | "- N3103 exceeded\n"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 108 | debug_diagram(tbf->diag, "N3103 exceeded"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 109 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 110 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 111 | return 0; |
| 112 | } |
| 113 | /* reschedule UL ack */ |
| 114 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 115 | } |
| 116 | } else |
| 117 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 118 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| 119 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 120 | "PACKET CONTROL ACK for PACKET UPLINK " |
| 121 | "ASSIGNMENT.\n"); |
| 122 | gprs_rlcmac_diag(tbf); |
| 123 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| 124 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 125 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 126 | debug_diagram(tbf->diag, "timeout UL-ASS"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 127 | tbf->n3105++; |
| 128 | if (tbf->n3105 == bts->n3105) { |
| 129 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 130 | debug_diagram(tbf->diag, "N3105 exceeded"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 131 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 132 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 133 | return 0; |
| 134 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 135 | /* reschedule UL assignment */ |
| 136 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 137 | } else |
| 138 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 139 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| 140 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 141 | "PACKET CONTROL ACK for PACKET DOWNLINK " |
| 142 | "ASSIGNMENT.\n"); |
| 143 | gprs_rlcmac_diag(tbf); |
| 144 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| 145 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 146 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 147 | debug_diagram(tbf->diag, "timeout DL-ASS"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 148 | tbf->n3105++; |
| 149 | if (tbf->n3105 == bts->n3105) { |
| 150 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 151 | debug_diagram(tbf->diag, "N3105 exceeded"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 152 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
| 153 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
| 154 | return 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 155 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 156 | /* reschedule DL assignment */ |
| 157 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 158 | } else |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 159 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 160 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| 161 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 162 | "PACKET DOWNLINK ACK.\n"); |
| 163 | gprs_rlcmac_diag(tbf); |
| 164 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 165 | } |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 166 | debug_diagram(tbf->diag, "timeout DL-ACK"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 167 | tbf->n3105++; |
| 168 | if (tbf->n3105 == bts->n3105) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 169 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 170 | debug_diagram(tbf->diag, "N3105 exceeded"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 171 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
| 172 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
| 173 | return 0; |
| 174 | } |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 175 | /* resend IMM.ASS on CCCH on timeout */ |
| 176 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)) |
| 177 | && !(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) { |
| 178 | LOGP(DRLCMAC, LOGL_DEBUG, "Re-send dowlink assignment " |
| 179 | "for TBF=%d on PCH (IMSI=%s)\n", tbf->tfi, |
| 180 | tbf->dir.dl.imsi); |
| 181 | /* send immediate assignment */ |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 182 | gprs_rlcmac_downlink_assignment(bts, tbf, 0, tbf->dir.dl.imsi); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 183 | tbf->dir.dl.wait_confirm = 1; |
| 184 | } |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 185 | } else |
| 186 | LOGP(DRLCMAC, LOGL_ERROR, "- Poll Timeout, but no event!\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 187 | |
| 188 | return 0; |
| 189 | } |
| 190 | |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 191 | int gprs_rlcmac_sba_timeout(struct gprs_rlcmac_sba *sba) |
| 192 | { |
| 193 | LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for SBA\n"); |
| 194 | llist_del(&sba->list); |
| 195 | talloc_free(sba); |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 200 | static uint8_t get_ms_class_by_capability(MS_Radio_Access_capability_t *cap) |
| 201 | { |
| 202 | int i; |
| 203 | |
| 204 | for (i = 0; i < cap->Count_MS_RA_capability_value; i++) { |
| 205 | if (!cap->MS_RA_capability_value[i].u.Content.Exist_Multislot_capability) |
| 206 | continue; |
| 207 | if (!cap->MS_RA_capability_value[i].u.Content.Multislot_capability.Exist_GPRS_multislot_class) |
| 208 | continue; |
| 209 | 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] | 210 | } |
| 211 | |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | /* Received Uplink RLC control block. */ |
Holger Hans Peter Freyther | 8d7a632 | 2013-10-17 15:23:49 +0200 | [diff] [blame] | 216 | int gprs_rlcmac_rcv_control_block(struct gprs_rlcmac_bts *bts, |
| 217 | bitvec *rlc_block, uint8_t trx, uint8_t ts, |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 218 | uint32_t fn) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 219 | { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 220 | int8_t tfi = 0; /* must be signed */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 221 | uint32_t tlli = 0; |
| 222 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 223 | struct gprs_rlcmac_sba *sba; |
Andreas Eversberg | 0f13c40 | 2012-07-16 11:59:23 +0200 | [diff] [blame] | 224 | int rc; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 225 | |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 226 | 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] | 227 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 228 | decode_gsm_rlcmac_uplink(rlc_block, ul_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 229 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 230 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 231 | switch (ul_control_block->u.MESSAGE_TYPE) { |
| 232 | case MT_PACKET_CONTROL_ACK: |
| 233 | tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 234 | tbf = tbf_by_poll_fn(fn, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 235 | if (!tbf) { |
| 236 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with " |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 237 | "unknown FN=%u TLL=0x%08x (TRX %d TS %d)\n", |
| 238 | fn, tlli, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 239 | break; |
| 240 | } |
| 241 | tfi = tbf->tfi; |
| 242 | if (tlli != tbf->tlli) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 243 | LOGP(DRLCMAC, LOGL_INFO, "Phone changed TLLI to " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 244 | "0x%08x\n", tlli); |
| 245 | tbf->tlli = tlli; |
| 246 | } |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 247 | 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] | 248 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 249 | |
| 250 | /* check if this control ack belongs to packet uplink ack */ |
| 251 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 252 | 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] | 253 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 254 | debug_diagram(tbf->diag, "got CTL-ACK (fin)"); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 255 | if ((tbf->state_flags & |
| 256 | (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { |
| 257 | tbf->state_flags &= |
| 258 | ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); |
| 259 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 260 | "ack for UL TBF=%d\n", tbf->tfi); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 261 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 262 | tbf_free(tbf); |
| 263 | break; |
| 264 | } |
| 265 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 266 | 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] | 267 | /* reset N3105 */ |
| 268 | tbf->n3105 = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 269 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 270 | debug_diagram(tbf->diag, "got CTL-ACK DL-ASS"); |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 271 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 272 | tbf = tbf_by_tlli(tbf->tlli, |
| 273 | GPRS_RLCMAC_DL_TBF); |
| 274 | if (!tbf) { |
| 275 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL " |
| 276 | "TBF is gone\n"); |
| 277 | break; |
| 278 | } |
| 279 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 280 | /* stop pending assignment timer */ |
| 281 | tbf_timer_stop(tbf); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 282 | if ((tbf->state_flags & |
| 283 | (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| 284 | tbf->state_flags &= |
| 285 | ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| 286 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink " |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 287 | "assignment for DL TBF=%d\n", tbf->tfi); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 288 | } |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 289 | tbf_assign_control_ts(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 290 | break; |
| 291 | } |
| 292 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 293 | 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] | 294 | /* reset N3105 */ |
| 295 | tbf->n3105 = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 296 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 297 | debug_diagram(tbf->diag, "got CTL-AC UL-ASS"); |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 298 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 299 | tbf = tbf_by_tlli(tbf->tlli, |
| 300 | GPRS_RLCMAC_UL_TBF); |
| 301 | if (!tbf) { |
| 302 | LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL " |
| 303 | "TBF is gone\n"); |
| 304 | break; |
| 305 | } |
| 306 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 307 | if ((tbf->state_flags & |
| 308 | (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| 309 | tbf->state_flags &= |
| 310 | ~(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| 311 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink " |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 312 | "assignment for UL TBF=%d\n", tbf->tfi); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 313 | } |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 314 | tbf_assign_control_ts(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 315 | break; |
| 316 | } |
| 317 | LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK " |
| 318 | "at no request\n"); |
| 319 | break; |
| 320 | case MT_PACKET_DOWNLINK_ACK_NACK: |
| 321 | tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 322 | tbf = tbf_by_poll_fn(fn, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 323 | if (!tbf) { |
| 324 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
Andreas Eversberg | aafcd70 | 2012-10-07 15:33:31 +0200 | [diff] [blame] | 325 | "unknown FN=%u TFI=%d (TRX %d TS %d)\n", |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 326 | fn, tfi, trx, ts); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 327 | break; |
| 328 | } |
Andreas Eversberg | aafcd70 | 2012-10-07 15:33:31 +0200 | [diff] [blame] | 329 | if (tbf->tfi != tfi) { |
| 330 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with " |
| 331 | "wrong TFI=%d, ignoring!\n", tfi); |
| 332 | break; |
| 333 | } |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 334 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK); |
| 335 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| 336 | tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
Andreas Eversberg | aafcd70 | 2012-10-07 15:33:31 +0200 | [diff] [blame] | 337 | LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink ack " |
| 338 | "for DL TBF=%d\n", tbf->tfi); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 339 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 340 | /* reset N3105 */ |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 341 | tbf->n3105 = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 342 | /* stop timer T3191 */ |
| 343 | tbf_timer_stop(tbf); |
| 344 | tlli = tbf->tlli; |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 345 | 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] | 346 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 347 | debug_diagram(tbf->diag, "got DL-ACK"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 348 | |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 349 | rc = gprs_rlcmac_downlink_ack(bts, tbf, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 350 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.FINAL_ACK_INDICATION, |
| 351 | ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER, |
| 352 | 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] | 353 | if (rc == 1) { |
| 354 | tbf_free(tbf); |
| 355 | break; |
| 356 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 357 | /* check for channel request */ |
| 358 | 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] | 359 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack " |
| 360 | "message, so we provide one:\n"); |
Holger Hans Peter Freyther | 96efa70 | 2013-09-29 07:44:39 +0200 | [diff] [blame] | 361 | 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] | 362 | /* schedule uplink assignment */ |
| 363 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
| 364 | } |
| 365 | break; |
| 366 | case MT_PACKET_RESOURCE_REQUEST: |
| 367 | if (ul_control_block->u.Packet_Resource_Request.ID.UnionType) { |
| 368 | tlli = ul_control_block->u.Packet_Resource_Request.ID.u.TLLI; |
| 369 | tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | 99a107d | 2012-09-27 09:21:52 +0200 | [diff] [blame] | 370 | if (tbf) { |
| 371 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 372 | "TLLI=0x%08x while UL TBF=%d still " |
| 373 | "exists. Killing pending DL TBF\n", |
| 374 | tlli, tbf->tfi); |
| 375 | tbf_free(tbf); |
| 376 | tbf = NULL; |
| 377 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 378 | if (!tbf) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 379 | uint8_t ms_class = 0; |
Andreas Eversberg | 99a107d | 2012-09-27 09:21:52 +0200 | [diff] [blame] | 380 | struct gprs_rlcmac_tbf *dl_tbf; |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 381 | uint8_t ta; |
Andreas Eversberg | 99a107d | 2012-09-27 09:21:52 +0200 | [diff] [blame] | 382 | |
| 383 | if ((dl_tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF))) { |
| 384 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 385 | "TLLI=0x%08x while DL TBF=%d still exists. " |
| 386 | "Killing pending DL TBF\n", tlli, |
| 387 | dl_tbf->tfi); |
| 388 | tbf_free(dl_tbf); |
| 389 | } |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 390 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF " |
| 391 | "in packet ressource request of single " |
| 392 | "block, so we provide one:\n"); |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 393 | sba = sba_find(trx, ts, fn); |
| 394 | if (!sba) { |
| 395 | LOGP(DRLCMAC, LOGL_NOTICE, "MS requests UL TBF " |
| 396 | "in packet ressource request of single " |
| 397 | "block, but there is no resource request " |
| 398 | "scheduled!\n"); |
| 399 | rc = recall_timing_advance(tlli); |
| 400 | if (rc >= 0) |
| 401 | ta = rc; |
| 402 | else |
| 403 | ta = 0; |
| 404 | } else { |
| 405 | ta = sba->ta; |
| 406 | remember_timing_advance(tlli, ta); |
| 407 | llist_del(&sba->list); |
| 408 | talloc_free(sba); |
| 409 | } |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 410 | if (ul_control_block->u.Packet_Resource_Request.Exist_MS_Radio_Access_capability) |
| 411 | ms_class = get_ms_class_by_capability(&ul_control_block->u.Packet_Resource_Request.MS_Radio_Access_capability); |
| 412 | if (!ms_class) |
| 413 | 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] | 414 | tbf = tbf_alloc_ul(bts, trx, ms_class, tlli, ta, NULL); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 415 | if (!tbf) |
| 416 | break; |
| 417 | /* set control ts to current MS's TS, until assignment complete */ |
| 418 | LOGP(DRLCMAC, LOGL_DEBUG, "Change control TS to %d until assinment is complete.\n", ts); |
| 419 | tbf->control_ts = ts; |
| 420 | /* schedule uplink assignment */ |
| 421 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 422 | debug_diagram(tbf->diag, "Res. REQ"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 423 | break; |
| 424 | } |
| 425 | tfi = tbf->tfi; |
| 426 | } else { |
| 427 | if (ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.UnionType) { |
| 428 | 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] | 429 | tbf = tbf_by_tfi(bts, tfi, trx, GPRS_RLCMAC_DL_TBF); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 430 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 431 | 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] | 432 | break; |
| 433 | } |
| 434 | } else { |
| 435 | 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] | 436 | tbf = tbf_by_tfi(bts, tfi, trx, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 437 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 438 | LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TBF=%d\n", tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 439 | break; |
| 440 | } |
| 441 | } |
| 442 | tlli = tbf->tlli; |
| 443 | } |
Andreas Eversberg | c8466f4 | 2012-07-15 19:34:53 +0200 | [diff] [blame] | 444 | 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] | 445 | break; |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 446 | case MT_PACKET_MEASUREMENT_REPORT: |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 447 | sba = sba_find(trx, ts, fn); |
| 448 | if (!sba) { |
| 449 | LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement " |
| 450 | "in packet ressource request of single " |
| 451 | "block, but there is no resource request " |
| 452 | "scheduled!\n"); |
| 453 | } else { |
| 454 | remember_timing_advance(ul_control_block->u.Packet_Measurement_Report.TLLI, sba->ta); |
| 455 | llist_del(&sba->list); |
| 456 | talloc_free(sba); |
| 457 | } |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 458 | gprs_rlcmac_meas_rep(&ul_control_block->u.Packet_Measurement_Report); |
| 459 | break; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 460 | default: |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 461 | LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] unknown control block received\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 462 | } |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 463 | talloc_free(ul_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 464 | return 1; |
| 465 | } |
| 466 | |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 467 | #ifdef DEBUG_DL_ASS_IDLE |
| 468 | char debug_imsi[16]; |
| 469 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 470 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 471 | /* |
| 472 | * UL data block flow |
| 473 | */ |
| 474 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 475 | /* get TLLI from received UL data block */ |
| 476 | static int tlli_from_ul_data(uint8_t *data, uint8_t len, uint32_t *tlli) |
| 477 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 478 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 479 | struct rlc_li_field *li; |
| 480 | uint8_t e; |
Andreas Eversberg | 106ea79 | 2012-11-04 12:55:16 +0100 | [diff] [blame] | 481 | uint32_t _tlli; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 482 | |
| 483 | if (!rh->ti) |
| 484 | return -EINVAL; |
| 485 | |
| 486 | data += 3; |
| 487 | len -= 3; |
| 488 | e = rh->e; |
| 489 | /* if E is not set (LI follows) */ |
| 490 | while (!e) { |
| 491 | if (!len) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 492 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA LI extended, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 493 | "but no more data\n"); |
| 494 | return -EINVAL; |
| 495 | } |
| 496 | /* get new E */ |
| 497 | li = (struct rlc_li_field *)data; |
| 498 | if (li->e == 0) /* if LI==0, E is interpreted as '1' */ |
| 499 | e = 1; |
| 500 | else |
| 501 | e = li->e; |
| 502 | data++; |
| 503 | len--; |
| 504 | } |
| 505 | if (len < 4) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 506 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of frame " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 507 | "border\n"); |
| 508 | return -EINVAL; |
| 509 | } |
Andreas Eversberg | 106ea79 | 2012-11-04 12:55:16 +0100 | [diff] [blame] | 510 | memcpy(&_tlli, data, 4); |
| 511 | *tlli = ntohl(_tlli); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 512 | |
| 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | /* Store received block data in LLC message(s) and forward to SGSN if complete. |
| 517 | */ |
| 518 | static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data, |
| 519 | uint8_t len) |
| 520 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 521 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 522 | uint8_t e, m; |
| 523 | struct rlc_li_field *li; |
| 524 | uint8_t frame_offset[16], offset = 0, chunk; |
| 525 | int i, frames = 0; |
| 526 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 527 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 528 | |
| 529 | data += 3; |
| 530 | len -= 3; |
| 531 | e = rh->e; /* if extended */ |
| 532 | m = 1; /* more frames, that means: the first frame */ |
| 533 | |
| 534 | /* Parse frame offsets from length indicator(s), if any. */ |
| 535 | while (1) { |
| 536 | if (frames == (int)sizeof(frame_offset)) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 537 | LOGP(DRLCMACUL, LOGL_ERROR, "Too many frames in " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 538 | "block\n"); |
| 539 | return -EINVAL; |
| 540 | } |
| 541 | frame_offset[frames++] = offset; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 542 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 543 | "%d\n", frames, offset); |
| 544 | if (!len) |
| 545 | break; |
| 546 | /* M == 0 and E == 0 is not allowed in this version. */ |
| 547 | if (!m && !e) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 548 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 549 | "ignored, because M='0' and E='0'.\n", |
| 550 | tbf->tfi); |
| 551 | return 0; |
| 552 | } |
| 553 | /* no more frames in this segment */ |
| 554 | if (e) { |
| 555 | break; |
| 556 | } |
| 557 | /* There is a new frame and an LI that delimits it. */ |
| 558 | if (m) { |
| 559 | li = (struct rlc_li_field *)data; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 560 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n", |
| 561 | li->li); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 562 | /* Special case: LI == 0 |
| 563 | * If the last segment would fit precisely into the |
| 564 | * rest of the RLC MAC block, there would be no way |
| 565 | * to delimit that this segment ends and is not |
| 566 | * continued in the next block. |
| 567 | * The special LI (0) is used to force the segment to |
| 568 | * extend into the next block, so it is delimited there. |
| 569 | * This LI must be skipped. Also it is the last LI. |
| 570 | */ |
| 571 | if (li->li == 0) { |
| 572 | data++; |
| 573 | len--; |
| 574 | m = 1; /* M is ignored, we know there is more */ |
| 575 | break; /* handle E as '1', so we break! */ |
| 576 | } |
| 577 | e = li->e; |
| 578 | m = li->m; |
| 579 | offset += li->li; |
| 580 | data++; |
| 581 | len--; |
| 582 | continue; |
| 583 | } |
| 584 | } |
| 585 | if (!m) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 586 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 587 | "data\n"); |
| 588 | } |
| 589 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 590 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 591 | len); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 592 | /* TLLI */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 593 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 594 | if (len < 4) { |
| 595 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of " |
| 596 | "frame border\n"); |
| 597 | return -EINVAL; |
| 598 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 599 | data += 4; |
| 600 | len -= 4; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 601 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: " |
| 602 | "%d\n", len); |
| 603 | } |
| 604 | |
| 605 | /* PFI */ |
| 606 | if (rh->pi) { |
| 607 | LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, " |
| 608 | "please disable in SYSTEM INFORMATION\n"); |
| 609 | if (len < 1) { |
| 610 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA PFI out of " |
| 611 | "frame border\n"); |
| 612 | return -EINVAL; |
| 613 | } |
| 614 | data++; |
| 615 | len--; |
| 616 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 617 | "%d\n", len); |
| 618 | } |
| 619 | |
| 620 | /* Now we have: |
| 621 | * - a list of frames offsets: frame_offset[] |
| 622 | * - number of frames: i |
| 623 | * - m == 0: Last frame carries spare data (end of TBF). |
| 624 | */ |
| 625 | |
| 626 | /* Check if last offset would exceed frame. */ |
| 627 | if (offset > len) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 628 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d ignored, " |
| 629 | "because LI delimits data that exceeds block size.\n", |
| 630 | tbf->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 631 | return -EINVAL; |
| 632 | } |
| 633 | |
| 634 | /* create LLC frames */ |
| 635 | for (i = 0; i < frames; i++) { |
| 636 | /* last frame ? */ |
| 637 | if (i == frames - 1) { |
| 638 | /* no more data in last frame */ |
| 639 | if (!m) |
| 640 | break; |
| 641 | /* data until end of frame */ |
| 642 | chunk = len - frame_offset[i]; |
| 643 | } else { |
| 644 | /* data until next frame */ |
| 645 | chunk = frame_offset[i + 1] - frame_offset[i]; |
| 646 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 647 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 648 | "frame at %d.\n", chunk, tbf->llc_index); |
| 649 | if (tbf->llc_index + chunk > LLC_MAX_LEN) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 650 | LOGP(DRLCMACUL, LOGL_NOTICE, "LLC frame exceeds " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 651 | "maximum size.\n"); |
| 652 | chunk = LLC_MAX_LEN - tbf->llc_index; |
| 653 | } |
| 654 | memcpy(tbf->llc_frame + tbf->llc_index, data + frame_offset[i], |
| 655 | chunk); |
| 656 | tbf->llc_index += chunk; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 657 | /* not last frame. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 658 | if (i != frames - 1) { |
| 659 | /* send frame to SGSN */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 660 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 661 | "TBF=%d: len=%d\n", tbf->tfi, tbf->llc_index); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 662 | gprs_rlcmac_tx_ul_ud(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 663 | tbf->llc_index = 0; /* reset frame space */ |
| 664 | /* also check if CV==0, because the frame may fill up the |
| 665 | * block precisely, then it is also complete. normally the |
| 666 | * frame would be extended into the next block with a 0-length |
| 667 | * delimiter added to this block. */ |
| 668 | } else if (rh->cv == 0) { |
| 669 | /* send frame to SGSN */ |
| 670 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 671 | "TBF=%d that fits precisely in last block: " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 672 | "len=%d\n", tbf->tfi, tbf->llc_index); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 673 | gprs_rlcmac_tx_ul_ud(tbf); |
| 674 | tbf->llc_index = 0; /* reset frame space */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 675 | } |
| 676 | } |
| 677 | |
| 678 | return 0; |
| 679 | } |
| 680 | |
Holger Hans Peter Freyther | ae947fc | 2013-10-17 13:29:03 +0200 | [diff] [blame] | 681 | struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_bts *bts, |
| 682 | struct gprs_rlcmac_tbf *tbf, |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 683 | uint32_t fn) |
| 684 | { |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 685 | int final = (tbf->state_is(GPRS_RLCMAC_FINISHED)); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 686 | struct msgb *msg; |
| 687 | |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 688 | if (final) { |
| 689 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 690 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 691 | "sheduled for TBF=%d, so we must wait for " |
| 692 | "final uplink ack...\n", tbf->tfi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 693 | return NULL; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 694 | } |
Holger Hans Peter Freyther | 96efa70 | 2013-09-29 07:44:39 +0200 | [diff] [blame] | 695 | if (sba_find(tbf->trx_no, tbf->control_ts, (fn + 13) % 2715648)) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 696 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 697 | "scheduled for single block allocation...\n"); |
| 698 | return NULL; |
| 699 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 700 | } |
| 701 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 702 | msg = msgb_alloc(23, "rlcmac_ul_ack"); |
| 703 | if (!msg) |
| 704 | return NULL; |
| 705 | bitvec *ack_vec = bitvec_alloc(23); |
| 706 | if (!ack_vec) { |
| 707 | msgb_free(msg); |
| 708 | return NULL; |
| 709 | } |
| 710 | bitvec_unhex(ack_vec, |
| 711 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 712 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
Holger Hans Peter Freyther | ae947fc | 2013-10-17 13:29:03 +0200 | [diff] [blame] | 713 | write_packet_uplink_ack(bts, mac_control_block, tbf, final); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 714 | encode_gsm_rlcmac_downlink(ack_vec, mac_control_block); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 715 | bitvec_pack(ack_vec, msgb_put(msg, 23)); |
| 716 | bitvec_free(ack_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 717 | talloc_free(mac_control_block); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 718 | |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 719 | /* now we must set this flag, so we are allowed to assign downlink |
| 720 | * TBF on PACCH. it is only allowed when TLLI is aknowledged. */ |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 721 | tbf->dir.ul.contention_resolution_done = 1; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 722 | |
| 723 | if (final) { |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 724 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 725 | tbf->poll_fn = (fn + 13) % 2715648; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 726 | /* waiting for final acknowledge */ |
| 727 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK; |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 728 | tbf->dir.ul.final_ack_sent = 1; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 729 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 730 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 731 | debug_diagram(tbf->diag, "send UL-ACK"); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 732 | |
| 733 | return msg; |
| 734 | } |
| 735 | |
| 736 | /* receive UL data block |
| 737 | * |
| 738 | * The blocks are defragmented and forwarded as LLC frames, if complete. |
| 739 | */ |
Holger Hans Peter Freyther | 698b612 | 2013-10-17 13:44:18 +0200 | [diff] [blame] | 740 | int gprs_rlcmac_rcv_data_block_acknowledged(struct gprs_rlcmac_bts *bts, |
| 741 | uint8_t trx, uint8_t ts, |
Andreas Eversberg | 570b44b | 2013-03-16 16:15:01 +0100 | [diff] [blame] | 742 | uint8_t *data, uint8_t len, int8_t rssi) |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 743 | { |
| 744 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 745 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 746 | uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index; |
| 747 | int rc; |
| 748 | |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 749 | switch (len) { |
| 750 | case 54: |
| 751 | /* omitting spare bits */ |
| 752 | len = 53; |
| 753 | break; |
| 754 | case 40: |
| 755 | /* omitting spare bits */ |
| 756 | len = 39; |
| 757 | break; |
| 758 | case 34: |
| 759 | /* omitting spare bits */ |
| 760 | len = 33; |
| 761 | break; |
| 762 | case 23: |
| 763 | break; |
| 764 | default: |
| 765 | LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid" |
| 766 | "length: %d)\n", len); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 767 | return -EINVAL; |
| 768 | } |
| 769 | |
| 770 | /* find TBF inst from given TFI */ |
Holger Hans Peter Freyther | b67a8a3 | 2013-07-28 18:55:14 +0200 | [diff] [blame] | 771 | tbf = tbf_by_tfi(bts, rh->tfi, trx, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 772 | if (!tbf) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 773 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TBF=%d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 774 | rh->tfi); |
| 775 | return 0; |
| 776 | } |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 777 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_UL_DATA); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 778 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 779 | LOGP(DRLCMACUL, LOGL_DEBUG, "UL DATA TBF=%d received (V(Q)=%d .. " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 780 | "V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r); |
| 781 | |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 782 | /* process RSSI */ |
| 783 | gprs_rlcmac_rssi(tbf, rssi); |
| 784 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 785 | /* get TLLI */ |
| 786 | if (!tbf->tlli_valid) { |
Andreas Eversberg | 3a7eb6b | 2012-10-07 15:55:25 +0200 | [diff] [blame] | 787 | struct gprs_rlcmac_tbf *dl_tbf, *ul_tbf; |
Andreas Eversberg | bc65586 | 2012-07-23 18:13:31 +0200 | [diff] [blame] | 788 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 789 | /* no TLLI yet */ |
| 790 | if (!rh->ti) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 791 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d without " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 792 | "TLLI, but no TLLI received yet\n", rh->tfi); |
| 793 | return 0; |
| 794 | } |
| 795 | rc = tlli_from_ul_data(data, len, &tbf->tlli); |
| 796 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 797 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 798 | "of UL DATA TBF=%d.\n", rh->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 799 | return 0; |
| 800 | } |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 801 | LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of " |
| 802 | "UL DATA TBF=%d.\n", tbf->tlli, rh->tfi); |
Andreas Eversberg | bc65586 | 2012-07-23 18:13:31 +0200 | [diff] [blame] | 803 | if ((dl_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF))) { |
| 804 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 805 | "TLLI=0x%08x while DL TBF=%d still exists. " |
| 806 | "Killing pending DL TBF\n", tbf->tlli, |
| 807 | dl_tbf->tfi); |
| 808 | tbf_free(dl_tbf); |
| 809 | } |
Andreas Eversberg | 3a7eb6b | 2012-10-07 15:55:25 +0200 | [diff] [blame] | 810 | /* tbf_by_tlli will not find your TLLI, because it is not |
| 811 | * yet marked valid */ |
| 812 | if ((ul_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF))) { |
| 813 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 814 | "TLLI=0x%08x while UL TBF=%d still exists. " |
| 815 | "Killing pending UL TBF\n", tbf->tlli, |
| 816 | ul_tbf->tfi); |
| 817 | tbf_free(ul_tbf); |
| 818 | } |
| 819 | /* mark TLLI valid now */ |
| 820 | tbf->tlli_valid = 1; |
Andreas Eversberg | a004e6a | 2013-05-13 16:45:21 +0200 | [diff] [blame] | 821 | /* store current timing advance */ |
| 822 | remember_timing_advance(tbf->tlli, tbf->ta); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 823 | /* already have TLLI, but we stille get another one */ |
| 824 | } else if (rh->ti) { |
| 825 | uint32_t tlli; |
| 826 | rc = tlli_from_ul_data(data, len, &tlli); |
| 827 | if (rc) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 828 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 829 | "of UL DATA TBF=%d.\n", rh->tfi); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 830 | return 0; |
| 831 | } |
| 832 | if (tlli != tbf->tlli) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 833 | LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL " |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 834 | "DATA TBF=%d. (Ignoring due to contention " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 835 | "resolution)\n", rh->tfi); |
| 836 | return 0; |
| 837 | } |
| 838 | } |
| 839 | |
| 840 | mod_sns = tbf->sns - 1; |
| 841 | mod_sns_half = (tbf->sns >> 1) - 1; |
| 842 | |
| 843 | /* restart T3169 */ |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 844 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 845 | |
| 846 | /* Increment RX-counter */ |
| 847 | tbf->dir.ul.rx_counter++; |
| 848 | |
| 849 | /* current block relative to lowest unreceived block */ |
| 850 | offset_v_q = (rh->bsn - tbf->dir.ul.v_q) & mod_sns; |
| 851 | /* If out of window (may happen if blocks below V(Q) are received |
| 852 | * again. */ |
| 853 | if (offset_v_q >= tbf->ws) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 854 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 855 | "%d..%d (it's normal)\n", rh->bsn, tbf->dir.ul.v_q, |
| 856 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 857 | return 0; |
| 858 | } |
| 859 | /* Write block to buffer and set receive state array. */ |
| 860 | index = rh->bsn & mod_sns_half; /* memory index of block */ |
| 861 | memcpy(tbf->rlc_block[index], data, len); /* Copy block. */ |
| 862 | tbf->rlc_block_len[index] = len; |
| 863 | tbf->dir.ul.v_n[index] = 'R'; /* Mark received block. */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 864 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 865 | rh->bsn, tbf->dir.ul.v_q, |
| 866 | (tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns); |
| 867 | /* Raise V(R) to highest received sequence number not received. */ |
| 868 | offset_v_r = (rh->bsn + 1 - tbf->dir.ul.v_r) & mod_sns; |
| 869 | if (offset_v_r < (tbf->sns >> 1)) { /* Positive offset, so raise. */ |
| 870 | while (offset_v_r--) { |
| 871 | if (offset_v_r) /* all except the received block */ |
| 872 | tbf->dir.ul.v_n[tbf->dir.ul.v_r & mod_sns_half] |
| 873 | = 'N'; /* Mark block as not received */ |
| 874 | tbf->dir.ul.v_r = (tbf->dir.ul.v_r + 1) & mod_sns; |
| 875 | /* Inc V(R). */ |
| 876 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 877 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 878 | tbf->dir.ul.v_r); |
| 879 | } |
| 880 | |
| 881 | /* Raise V(Q) if possible, and retrieve LLC frames from blocks. |
| 882 | * This is looped until there is a gap (non received block) or |
| 883 | * the window is empty.*/ |
| 884 | while (tbf->dir.ul.v_q != tbf->dir.ul.v_r && tbf->dir.ul.v_n[ |
| 885 | (index = tbf->dir.ul.v_q & mod_sns_half)] == 'R') { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 886 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 887 | "V(Q) to %d\n", tbf->dir.ul.v_q, |
| 888 | (tbf->dir.ul.v_q + 1) & mod_sns); |
| 889 | /* get LLC data from block */ |
| 890 | gprs_rlcmac_assemble_llc(tbf, tbf->rlc_block[index], |
| 891 | tbf->rlc_block_len[index]); |
| 892 | /* raise V(Q), because block already received */ |
| 893 | tbf->dir.ul.v_q = (tbf->dir.ul.v_q + 1) & mod_sns; |
| 894 | } |
| 895 | |
| 896 | /* Check CV of last frame in buffer */ |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 897 | if (tbf->state_is(GPRS_RLCMAC_FLOW) /* still in flow state */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 898 | && tbf->dir.ul.v_q == tbf->dir.ul.v_r) { /* if complete */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 899 | struct rlc_ul_header *last_rh = (struct rlc_ul_header *) |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 900 | tbf->rlc_block[(tbf->dir.ul.v_r - 1) & mod_sns_half]; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 901 | LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 902 | "last block: BSN=%d CV=%d\n", last_rh->bsn, |
| 903 | last_rh->cv); |
| 904 | if (last_rh->cv == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 905 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 906 | "TBF\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 907 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 908 | /* Reset N3103 counter. */ |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 909 | tbf->dir.ul.n3103 = 0; |
| 910 | } |
| 911 | } |
| 912 | |
| 913 | /* If TLLI is included or if we received half of the window, we send |
| 914 | * an ack/nack */ |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 915 | if (rh->si || rh->ti || tbf->state_is(GPRS_RLCMAC_FINISHED) |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 916 | || (tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 917 | if (rh->si) { |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 918 | LOGP(DRLCMACUL, LOGL_NOTICE, "- Scheduling Ack/Nack, " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 919 | "because MS is stalled.\n"); |
| 920 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 921 | if (rh->ti) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 922 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 923 | "because TLLI is included.\n"); |
| 924 | } |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 925 | if (tbf->state_is(GPRS_RLCMAC_FINISHED)) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 926 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 927 | "because last block has CV==0.\n"); |
| 928 | } |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 929 | if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 930 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 931 | "because %d frames received.\n", |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 932 | SEND_ACK_AFTER_FRAMES); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 933 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 934 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) { |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 935 | #ifdef DEBUG_DIAGRAM |
| 936 | if (rh->si) |
| 937 | debug_diagram(tbf->diag, "sched UL-ACK stall"); |
| 938 | if (rh->ti) |
| 939 | debug_diagram(tbf->diag, "sched UL-ACK TLLI"); |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 940 | if (tbf->state_is(GPRS_RLCMAC_FINISHED)) |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 941 | debug_diagram(tbf->diag, "sched UL-ACK CV==0"); |
| 942 | if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) |
| 943 | debug_diagram(tbf->diag, "sched UL-ACK n=%d", |
| 944 | tbf->dir.ul.rx_counter); |
| 945 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 946 | /* trigger sending at next RTS */ |
| 947 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 948 | } else { |
| 949 | /* already triggered */ |
| 950 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Sending Ack/Nack is " |
| 951 | "already triggered, don't schedule!\n"); |
| 952 | } |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 953 | } |
| 954 | |
| 955 | return 0; |
| 956 | } |
| 957 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 958 | struct msgb *gprs_rlcmac_send_packet_uplink_assignment( |
Holger Hans Peter Freyther | d507ce6 | 2013-10-17 15:32:37 +0200 | [diff] [blame] | 959 | struct gprs_rlcmac_bts *bts, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 960 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 961 | { |
| 962 | struct msgb *msg; |
| 963 | struct gprs_rlcmac_tbf *new_tbf; |
| 964 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 965 | #if POLLING_ASSIGNMENT_UL == 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 966 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 967 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 968 | "sheduled for TBF=%d, so we must wait for uplink " |
| 969 | "assignment...\n", tbf->tfi); |
| 970 | return NULL; |
| 971 | } |
Holger Hans Peter Freyther | 96efa70 | 2013-09-29 07:44:39 +0200 | [diff] [blame] | 972 | if (sba_find(tbf->trx_no, tbf->control_ts, (fn + 13) % 2715648)) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 973 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already scheduled for " |
| 974 | "single block allocation...\n"); |
| 975 | return NULL; |
| 976 | } |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 977 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 978 | |
| 979 | /* on down TBF we get the uplink TBF to be assigned. */ |
| 980 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
| 981 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); |
| 982 | else |
| 983 | new_tbf = tbf; |
| 984 | |
| 985 | if (!new_tbf) { |
| 986 | LOGP(DRLCMACUL, LOGL_ERROR, "We have a schedule for uplink " |
| 987 | "assignment at downlink TBF=%d, but there is no uplink " |
| 988 | "TBF\n", tbf->tfi); |
| 989 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 990 | return NULL; |
| 991 | } |
| 992 | |
| 993 | msg = msgb_alloc(23, "rlcmac_ul_ass"); |
| 994 | if (!msg) |
| 995 | return NULL; |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 996 | 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] | 997 | bitvec *ass_vec = bitvec_alloc(23); |
| 998 | if (!ass_vec) { |
| 999 | msgb_free(msg); |
| 1000 | return NULL; |
| 1001 | } |
| 1002 | bitvec_unhex(ass_vec, |
| 1003 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Holger Hans Peter Freyther | 485860c | 2013-10-17 15:38:23 +0200 | [diff] [blame] | 1004 | write_packet_uplink_assignment(bts, ass_vec, tbf->tfi, |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1005 | (tbf->direction == GPRS_RLCMAC_DL_TBF), tbf->tlli, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1006 | tbf->tlli_valid, new_tbf, POLLING_ASSIGNMENT_UL, bts->alpha, |
Andreas Eversberg | afdd9e1 | 2012-10-07 17:08:55 +0200 | [diff] [blame] | 1007 | bts->gamma, -1); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1008 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1009 | 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] | 1010 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Uplink Assignment +++++++++++++++++++++++++\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1011 | decode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1012 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 1013 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Uplink Assignment -------------------------\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1014 | bitvec_free(ass_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1015 | talloc_free(mac_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1016 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1017 | #if POLLING_ASSIGNMENT_UL == 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1018 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1019 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1020 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK; |
| 1021 | #else |
| 1022 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 1023 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 1024 | tbf_assign_control_ts(new_tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1025 | #endif |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1026 | debug_diagram(tbf->diag, "send UL-ASS"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1027 | |
| 1028 | return msg; |
| 1029 | } |
| 1030 | |
Holger Hans Peter Freyther | b0250eb | 2013-10-17 13:46:19 +0200 | [diff] [blame] | 1031 | int gprs_rlcmac_rcv_rach(struct gprs_rlcmac_bts *bts, |
| 1032 | uint8_t ra, uint32_t Fn, int16_t qta) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1033 | { |
| 1034 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | 02d7cd2 | 2013-01-15 08:59:34 +0100 | [diff] [blame] | 1035 | uint8_t trx, ts = 0; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1036 | int8_t tfi; /* must be signed */ |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1037 | uint8_t sb = 0; |
| 1038 | uint32_t sb_fn = 0; |
| 1039 | int rc; |
| 1040 | uint8_t plen; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1041 | |
| 1042 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide " |
| 1043 | "one:\n"); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1044 | if ((ra & 0xf8) == 0x70) { |
| 1045 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block " |
| 1046 | "allocation\n"); |
| 1047 | sb = 1; |
| 1048 | } else if (bts->force_two_phase) { |
| 1049 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single phase access, " |
| 1050 | "but we force two phase access\n"); |
| 1051 | sb = 1; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1052 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1053 | if (qta < 0) |
| 1054 | qta = 0; |
| 1055 | if (qta > 252) |
| 1056 | qta = 252; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1057 | if (sb) { |
Holger Hans Peter Freyther | 173a240 | 2013-10-16 21:47:45 +0200 | [diff] [blame] | 1058 | rc = sba_alloc(bts, &trx, &ts, &sb_fn, qta >> 2); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1059 | if (rc < 0) |
| 1060 | return rc; |
| 1061 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] RACH qbit-ta=%d " |
| 1062 | "ra=0x%02x, Fn=%d (%d,%d,%d)\n", qta, ra, Fn, |
| 1063 | (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); |
| 1064 | LOGP(DRLCMAC, LOGL_INFO, "TX: Immediate Assignment Uplink " |
| 1065 | "(AGCH)\n"); |
| 1066 | } else { |
| 1067 | // Create new TBF |
Holger Hans Peter Freyther | bcafdf8 | 2013-08-24 21:13:31 +0200 | [diff] [blame] | 1068 | #warning "Copy and pate with other routines.." |
Holger Hans Peter Freyther | d6bd91e | 2013-08-24 21:16:55 +0200 | [diff] [blame] | 1069 | tfi = tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &trx, -1); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1070 | if (tfi < 0) { |
| 1071 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 1072 | /* FIXME: send reject */ |
| 1073 | return -EBUSY; |
| 1074 | } |
| 1075 | /* 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] | 1076 | 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] | 1077 | if (!tbf) { |
| 1078 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 1079 | /* FIXME: send reject */ |
| 1080 | return -EBUSY; |
| 1081 | } |
| 1082 | tbf->ta = qta >> 2; |
| 1083 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 1084 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH); |
| 1085 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
| 1086 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] START TFI: %u\n", |
| 1087 | tbf->tfi); |
| 1088 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u RACH " |
| 1089 | "qbit-ta=%d ra=0x%02x, Fn=%d (%d,%d,%d)\n", tbf->tfi, |
| 1090 | qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); |
| 1091 | LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u Immediate " |
| 1092 | "Assignment Uplink (AGCH)\n", tbf->tfi); |
| 1093 | } |
Andreas Eversberg | 7b04501 | 2012-07-05 07:38:49 +0200 | [diff] [blame] | 1094 | bitvec *immediate_assignment = bitvec_alloc(22) /* without plen */; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1095 | bitvec_unhex(immediate_assignment, |
| 1096 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 1097 | if (sb) |
Holger Hans Peter Freyther | ee7a535 | 2013-10-17 15:41:36 +0200 | [diff] [blame] | 1098 | plen = write_immediate_assignment(bts, immediate_assignment, 0, ra, |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1099 | Fn, qta >> 2, bts->trx[trx].arfcn, ts, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1100 | 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] | 1101 | bts->alpha, bts->gamma, -1); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1102 | else |
Holger Hans Peter Freyther | ee7a535 | 2013-10-17 15:41:36 +0200 | [diff] [blame] | 1103 | plen = write_immediate_assignment(bts, immediate_assignment, 0, ra, |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1104 | Fn, tbf->ta, tbf->arfcn, tbf->first_ts, tbf->tsc, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1105 | 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] | 1106 | bts->alpha, bts->gamma, -1); |
Andreas Eversberg | 7b04501 | 2012-07-05 07:38:49 +0200 | [diff] [blame] | 1107 | pcu_l1if_tx_agch(immediate_assignment, plen); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1108 | bitvec_free(immediate_assignment); |
| 1109 | |
| 1110 | return 0; |
| 1111 | } |
| 1112 | |
| 1113 | |
| 1114 | /* |
| 1115 | * DL data block flow |
| 1116 | */ |
| 1117 | |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1118 | static struct msgb *llc_dequeue(struct gprs_rlcmac_tbf *tbf) |
| 1119 | { |
| 1120 | struct msgb *msg; |
| 1121 | struct timeval *tv, tv_now; |
| 1122 | uint32_t octets = 0, frames = 0; |
| 1123 | |
| 1124 | gettimeofday(&tv_now, NULL); |
| 1125 | |
| 1126 | while ((msg = msgb_dequeue(&tbf->llc_queue))) { |
| 1127 | tv = (struct timeval *)msg->data; |
| 1128 | msgb_pull(msg, sizeof(*tv)); |
| 1129 | if (tv->tv_sec /* not infinite */ |
| 1130 | && (tv_now.tv_sec > tv->tv_sec /* and secs expired */ |
| 1131 | || (tv_now.tv_sec == tv->tv_sec /* .. or if secs equal .. */ |
| 1132 | && tv_now.tv_usec > tv->tv_usec))) { /* .. usecs expired */ |
| 1133 | LOGP(DRLCMACDL, LOGL_NOTICE, "Discarding LLC PDU of " |
| 1134 | "DL TBF=%d, because lifetime limit reached\n", |
| 1135 | tbf->tfi); |
| 1136 | frames++; |
| 1137 | octets += msg->len; |
| 1138 | msgb_free(msg); |
| 1139 | continue; |
| 1140 | } |
| 1141 | break; |
| 1142 | } |
| 1143 | |
| 1144 | if (frames) { |
| 1145 | if (frames > 0xff) |
| 1146 | frames = 0xff; |
| 1147 | if (octets > 0xffffff) |
| 1148 | octets = 0xffffff; |
Holger Hans Peter Freyther | 90692f9 | 2013-07-13 12:51:16 +0200 | [diff] [blame] | 1149 | bssgp_tx_llc_discarded(gprs_bssgp_pcu_current_bctx(), |
| 1150 | tbf->tlli, frames, octets); |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1151 | } |
| 1152 | |
| 1153 | return msg; |
| 1154 | } |
| 1155 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1156 | /* send DL data block |
| 1157 | * |
| 1158 | * The messages are fragmented and forwarded as data blocks. |
| 1159 | */ |
| 1160 | struct msgb *gprs_rlcmac_send_data_block_acknowledged( |
Holger Hans Peter Freyther | 4ffc260 | 2013-10-17 15:21:10 +0200 | [diff] [blame] | 1161 | struct gprs_rlcmac_bts *bts, |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 1162 | struct gprs_rlcmac_tbf *tbf, uint32_t fn, uint8_t ts) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1163 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1164 | struct rlc_dl_header *rh; |
| 1165 | struct rlc_li_field *li; |
| 1166 | uint8_t block_length; /* total length of block, including spare bits */ |
| 1167 | uint8_t block_data; /* usable data of block, w/o spare bits, inc. MAC */ |
| 1168 | struct msgb *msg, *dl_msg; |
| 1169 | uint8_t bsn; |
| 1170 | uint16_t mod_sns = tbf->sns - 1; |
| 1171 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 1172 | uint16_t index; |
| 1173 | uint8_t *delimiter, *data, *e_pointer; |
| 1174 | uint8_t len; |
| 1175 | uint16_t space, chunk; |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1176 | int first_fin_ack = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1177 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1178 | LOGP(DRLCMACDL, LOGL_DEBUG, "DL DATA TBF=%d downlink (V(A)==%d .. " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1179 | "V(S)==%d)\n", tbf->tfi, tbf->dir.dl.v_a, tbf->dir.dl.v_s); |
| 1180 | |
| 1181 | do_resend: |
| 1182 | /* check if there is a block with negative acknowledgement */ |
| 1183 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1184 | bsn = (bsn + 1) & mod_sns) { |
| 1185 | index = (bsn & mod_sns_half); |
| 1186 | if (tbf->dir.dl.v_b[index] == 'N' |
| 1187 | || tbf->dir.dl.v_b[index] == 'X') { |
| 1188 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", |
| 1189 | bsn); |
| 1190 | /* re-send block with negative aknowlegement */ |
| 1191 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 1192 | goto tx_block; |
| 1193 | } |
| 1194 | } |
| 1195 | |
| 1196 | /* if the window has stalled, or transfer is complete, |
| 1197 | * send an unacknowledged block */ |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 1198 | if (tbf->state_is(GPRS_RLCMAC_FINISHED) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1199 | || ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns) == tbf->ws) { |
| 1200 | int resend = 0; |
| 1201 | |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 1202 | if (tbf->state_is(GPRS_RLCMAC_FINISHED)) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1203 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 1204 | "because all blocks have been transmitted.\n", |
| 1205 | tbf->dir.dl.v_a); |
| 1206 | else |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1207 | LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1208 | "because all window is stalled.\n", |
| 1209 | tbf->dir.dl.v_a); |
| 1210 | /* If V(S) == V(A) and finished state, we would have received |
| 1211 | * acknowledgement of all transmitted block. In this case we |
| 1212 | * would have transmitted the final block, and received ack |
| 1213 | * from MS. But in this case we did not receive the final ack |
| 1214 | * indication from MS. This should never happen if MS works |
| 1215 | * correctly. */ |
| 1216 | if (tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1217 | LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks, " |
| 1218 | "so we re-transmit final block!\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1219 | /* we just send final block again */ |
| 1220 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 1221 | goto tx_block; |
| 1222 | } |
| 1223 | |
| 1224 | /* cycle through all unacked blocks */ |
| 1225 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1226 | bsn = (bsn + 1) & mod_sns) { |
| 1227 | index = (bsn & mod_sns_half); |
| 1228 | if (tbf->dir.dl.v_b[index] == 'U') { |
| 1229 | /* mark to be re-send */ |
| 1230 | tbf->dir.dl.v_b[index] = 'X'; |
| 1231 | resend++; |
| 1232 | } |
| 1233 | } |
| 1234 | /* At this point there should be at leasst one unacked block |
| 1235 | * to be resent. If not, this is an software error. */ |
| 1236 | if (resend == 0) { |
| 1237 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 1238 | "There are no unacknowledged blocks, but V(A) " |
| 1239 | " != V(S). PLEASE FIX!\n"); |
| 1240 | /* we just send final block again */ |
| 1241 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 1242 | goto tx_block; |
| 1243 | } |
| 1244 | goto do_resend; |
| 1245 | } |
| 1246 | |
| 1247 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n", |
| 1248 | tbf->dir.dl.v_s); |
| 1249 | |
| 1250 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 1251 | index = tbf->dir.dl.v_s & mod_sns_half; |
| 1252 | data = tbf->rlc_block[index]; |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 1253 | if (tbf->cs == 0) { |
Andreas Eversberg | 499ff41 | 2012-10-03 14:21:36 +0200 | [diff] [blame] | 1254 | tbf->cs = bts->initial_cs_dl; |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 1255 | if (tbf->cs < 1 || tbf->cs > 4) |
| 1256 | tbf->cs = 1; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1257 | } |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 1258 | block_length = gprs_rlcmac_cs[tbf->cs].block_length; |
| 1259 | block_data = gprs_rlcmac_cs[tbf->cs].block_data; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1260 | memset(data, 0x2b, block_data); /* spare bits will be left 0 */ |
| 1261 | rh = (struct rlc_dl_header *)data; |
| 1262 | rh->pt = 0; /* Data Block */ |
| 1263 | rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */ |
| 1264 | rh->usf = 7; /* will be set at scheduler */ |
| 1265 | rh->pr = 0; /* FIXME: power reduction */ |
| 1266 | rh->tfi = tbf->tfi; /* TFI */ |
| 1267 | rh->fbi = 0; /* Final Block Indicator, set late, if true */ |
| 1268 | rh->bsn = tbf->dir.dl.v_s; /* Block Sequence Number */ |
| 1269 | rh->e = 0; /* Extension bit, maybe set later */ |
| 1270 | e_pointer = data + 2; /* points to E of current chunk */ |
| 1271 | data += 3; |
| 1272 | delimiter = data; /* where next length header would be stored */ |
| 1273 | space = block_data - 3; |
| 1274 | while (1) { |
| 1275 | chunk = tbf->llc_length - tbf->llc_index; |
| 1276 | /* if chunk will exceed block limit */ |
| 1277 | if (chunk > space) { |
| 1278 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1279 | "larger than space (%d) left in block: copy " |
| 1280 | "only remaining space, and we are done\n", |
| 1281 | chunk, space); |
| 1282 | /* block is filled, so there is no extension */ |
| 1283 | *e_pointer |= 0x01; |
| 1284 | /* fill only space */ |
| 1285 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1286 | /* incement index */ |
| 1287 | tbf->llc_index += space; |
| 1288 | /* return data block as message */ |
| 1289 | break; |
| 1290 | } |
| 1291 | /* if FINAL chunk would fit precisely in space left */ |
| 1292 | if (chunk == space && llist_empty(&tbf->llc_queue)) { |
| 1293 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1294 | "would exactly fit into space (%d): because " |
| 1295 | "this is a final block, we don't add length " |
| 1296 | "header, and we are done\n", chunk, space); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1297 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for " |
| 1298 | "TBF=%d that fits precisely in last block: " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1299 | "len=%d\n", tbf->tfi, tbf->llc_length); |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1300 | gprs_rlcmac_dl_bw(tbf, tbf->llc_length); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1301 | /* block is filled, so there is no extension */ |
| 1302 | *e_pointer |= 0x01; |
| 1303 | /* fill space */ |
| 1304 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1305 | /* reset LLC frame */ |
| 1306 | tbf->llc_index = tbf->llc_length = 0; |
| 1307 | /* final block */ |
| 1308 | rh->fbi = 1; /* we indicate final block */ |
| 1309 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1310 | /* return data block as message */ |
| 1311 | break; |
| 1312 | } |
| 1313 | /* if chunk would fit exactly in space left */ |
| 1314 | if (chunk == space) { |
| 1315 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1316 | "would exactly fit into space (%d): add length " |
| 1317 | "header with LI=0, to make frame extend to " |
| 1318 | "next block, and we are done\n", chunk, space); |
| 1319 | /* make space for delimiter */ |
| 1320 | if (delimiter != data) |
| 1321 | memcpy(delimiter + 1, delimiter, |
| 1322 | data - delimiter); |
| 1323 | data++; |
| 1324 | space--; |
| 1325 | /* add LI with 0 length */ |
| 1326 | li = (struct rlc_li_field *)delimiter; |
| 1327 | li->e = 1; /* not more extension */ |
| 1328 | li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| 1329 | li->li = 0; /* chunk fills the complete space */ |
| 1330 | // no need to set e_pointer nor increase delimiter |
| 1331 | /* fill only space, which is 1 octet less than chunk */ |
| 1332 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 1333 | /* incement index */ |
| 1334 | tbf->llc_index += space; |
| 1335 | /* return data block as message */ |
| 1336 | break; |
| 1337 | } |
| 1338 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 1339 | "than remaining space (%d): add length header to " |
| 1340 | "to delimit LLC frame\n", chunk, space); |
| 1341 | /* the LLC frame chunk ends in this block */ |
| 1342 | /* make space for delimiter */ |
| 1343 | if (delimiter != data) |
| 1344 | memcpy(delimiter + 1, delimiter, data - delimiter); |
| 1345 | data++; |
| 1346 | space--; |
| 1347 | /* add LI to delimit frame */ |
| 1348 | li = (struct rlc_li_field *)delimiter; |
| 1349 | li->e = 0; /* Extension bit, maybe set later */ |
| 1350 | li->m = 0; /* will be set later, if there is more LLC data */ |
| 1351 | li->li = chunk; /* length of chunk */ |
| 1352 | e_pointer = delimiter; /* points to E of current delimiter */ |
| 1353 | delimiter++; |
| 1354 | /* copy (rest of) LLC frame to space */ |
| 1355 | memcpy(data, tbf->llc_frame + tbf->llc_index, chunk); |
| 1356 | data += chunk; |
| 1357 | space -= chunk; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1358 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for TBF=%d: " |
| 1359 | "len=%d\n", tbf->tfi, tbf->llc_length); |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1360 | gprs_rlcmac_dl_bw(tbf, tbf->llc_length); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1361 | /* reset LLC frame */ |
| 1362 | tbf->llc_index = tbf->llc_length = 0; |
| 1363 | /* dequeue next LLC frame, if any */ |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1364 | msg = llc_dequeue(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1365 | if (msg) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1366 | LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC for " |
| 1367 | "TBF=%d (len=%d)\n", tbf->tfi, msg->len); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1368 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1369 | tbf->llc_length = msg->len; |
| 1370 | msgb_free(msg); |
| 1371 | } |
| 1372 | /* if we have more data and we have space left */ |
| 1373 | if (space > 0 && tbf->llc_length) { |
| 1374 | li->m = 1; /* we indicate more frames to follow */ |
| 1375 | continue; |
| 1376 | } |
| 1377 | /* if we don't have more LLC frames */ |
| 1378 | if (!tbf->llc_length) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1379 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1380 | "done.\n"); |
| 1381 | li->e = 1; /* we cannot extend */ |
| 1382 | rh->fbi = 1; /* we indicate final block */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1383 | first_fin_ack = 1; |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1384 | /* + 1 indicates: first final ack */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1385 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 1386 | break; |
| 1387 | } |
| 1388 | /* we have no space left */ |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1389 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1390 | "done.\n"); |
| 1391 | li->e = 1; /* we cannot extend */ |
| 1392 | break; |
| 1393 | } |
| 1394 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n", |
| 1395 | osmo_hexdump(tbf->rlc_block[index], block_length)); |
| 1396 | tbf->rlc_block_len[index] = block_length; |
| 1397 | /* raise send state and set ack state array */ |
| 1398 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 1399 | tbf->dir.dl.v_s = (tbf->dir.dl.v_s + 1) & mod_sns; /* inc send state */ |
| 1400 | |
| 1401 | tx_block: |
| 1402 | /* from this point on, new block is sent or old block is resent */ |
| 1403 | |
| 1404 | /* get data and header from current block */ |
| 1405 | data = tbf->rlc_block[index]; |
| 1406 | len = tbf->rlc_block_len[index]; |
| 1407 | rh = (struct rlc_dl_header *)data; |
| 1408 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1409 | /* Clear Polling, if still set in history buffer */ |
| 1410 | rh->s_p = 0; |
| 1411 | |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1412 | /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| 1413 | */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1414 | if (tbf->dir.dl.tx_counter >= POLL_ACK_AFTER_FRAMES || first_fin_ack) { |
| 1415 | if (first_fin_ack) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1416 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1417 | "polling, because first final block sent.\n"); |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1418 | } else { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1419 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 1420 | "polling, because %d blocks sent.\n", |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 1421 | POLL_ACK_AFTER_FRAMES); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1422 | } |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1423 | /* scheduling not possible, because: */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1424 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1425 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1426 | "sheduled for TBF=%d, so we must wait for " |
| 1427 | "requesting downlink ack\n", tbf->tfi); |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1428 | else if (tbf->control_ts != ts) |
| 1429 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 1430 | "sheduled in this TS %d, waiting for " |
| 1431 | "TS %d\n", ts, tbf->control_ts); |
Holger Hans Peter Freyther | 96efa70 | 2013-09-29 07:44:39 +0200 | [diff] [blame] | 1432 | else if (sba_find(tbf->trx_no, ts, (fn + 13) % 2715648)) |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1433 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 1434 | "sheduled, because single block alllocation " |
| 1435 | "already exists\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1436 | else { |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1437 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling sheduled in this " |
| 1438 | "TS %d\n", ts); |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 1439 | tbf->dir.dl.tx_counter = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1440 | /* start timer whenever we send the final block */ |
| 1441 | if (rh->fbi == 1) |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 1442 | tbf_timer_start(tbf, 3191, bts->t3191, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1443 | |
| 1444 | /* schedule polling */ |
| 1445 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1446 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1447 | |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1448 | #ifdef DEBUG_DIAGRAM |
| 1449 | debug_diagram(tbf->diag, "poll DL-ACK"); |
| 1450 | if (first_fin_ack) |
| 1451 | debug_diagram(tbf->diag, "(is first FINAL)"); |
| 1452 | if (rh->fbi) |
| 1453 | debug_diagram(tbf->diag, "(FBI is set)"); |
| 1454 | #endif |
| 1455 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1456 | /* set polling in header */ |
| 1457 | rh->rrbp = 0; /* N+13 */ |
| 1458 | rh->s_p = 1; /* Polling */ |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1459 | |
| 1460 | /* Increment TX-counter */ |
| 1461 | tbf->dir.dl.tx_counter++; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1462 | } |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 1463 | } else { |
| 1464 | /* Increment TX-counter */ |
| 1465 | tbf->dir.dl.tx_counter++; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1466 | } |
| 1467 | |
| 1468 | /* return data block as message */ |
| 1469 | dl_msg = msgb_alloc(len, "rlcmac_dl_data"); |
| 1470 | if (!dl_msg) |
| 1471 | return NULL; |
| 1472 | memcpy(msgb_put(dl_msg, len), data, len); |
| 1473 | |
| 1474 | return dl_msg; |
| 1475 | } |
| 1476 | |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 1477 | int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_bts *bts, |
| 1478 | struct gprs_rlcmac_tbf *tbf, uint8_t final, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1479 | uint8_t ssn, uint8_t *rbb) |
| 1480 | { |
| 1481 | char show_rbb[65], show_v_b[RLC_MAX_SNS + 1]; |
| 1482 | uint16_t mod_sns = tbf->sns - 1; |
| 1483 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 1484 | int i; /* must be signed */ |
| 1485 | int16_t dist; /* must be signed */ |
| 1486 | uint8_t bit; |
| 1487 | uint16_t bsn; |
| 1488 | struct msgb *msg; |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1489 | uint16_t lost = 0, received = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1490 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1491 | LOGP(DRLCMACDL, LOGL_DEBUG, "TBF=%d downlink acknowledge\n", |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1492 | tbf->tfi); |
| 1493 | |
| 1494 | if (!final) { |
| 1495 | /* show received array in debug (bit 64..1) */ |
| 1496 | for (i = 63; i >= 0; i--) { |
| 1497 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1498 | show_rbb[i] = (bit) ? '1' : 'o'; |
| 1499 | } |
| 1500 | show_rbb[64] = '\0'; |
| 1501 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 1502 | "(BSN=%d) 1=ACK o=NACK\n", (ssn - 64) & mod_sns, |
| 1503 | show_rbb, (ssn - 1) & mod_sns); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1504 | |
| 1505 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 1506 | /* calculate distance of ssn from V(S) */ |
| 1507 | dist = (tbf->dir.dl.v_s - ssn) & mod_sns; |
| 1508 | /* check if distance is less than distance V(A)..V(S) */ |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1509 | 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] | 1510 | /* this might happpen, if the downlink assignment |
| 1511 | * was not received by ms and the ack refers |
| 1512 | * to previous TBF |
| 1513 | * FIXME: we should implement polling for |
| 1514 | * control ack!*/ |
| 1515 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 1516 | "V(A)..V(S) range (DL TBF=%d) Free TFB!\n", |
| 1517 | tbf->tfi); |
| 1518 | return 1; /* indicate to free TBF */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1519 | } |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1520 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
| 1521 | for (i = 63, bsn = (ssn - 1) & mod_sns; |
| 1522 | i >= 0 && bsn != ((tbf->dir.dl.v_a - 1) & mod_sns); |
| 1523 | i--, bsn = (bsn - 1) & mod_sns) { |
| 1524 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1525 | if (bit) { |
| 1526 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1527 | "ack for BSN=%d\n", bsn); |
| 1528 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] |
| 1529 | != 'A') |
| 1530 | received++; |
| 1531 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'A'; |
| 1532 | } else { |
| 1533 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1534 | "NACK for BSN=%d\n", bsn); |
| 1535 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'N'; |
| 1536 | lost++; |
| 1537 | } |
| 1538 | } |
| 1539 | /* report lost and received packets */ |
| 1540 | gprs_rlcmac_received_lost(tbf, received, lost); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1541 | |
| 1542 | /* raise V(A), if possible */ |
| 1543 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1544 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1545 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] == 'A') { |
| 1546 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'I'; |
| 1547 | /* mark invalid */ |
| 1548 | tbf->dir.dl.v_a = (tbf->dir.dl.v_a + 1) |
| 1549 | & mod_sns; |
| 1550 | } else |
| 1551 | break; |
| 1552 | } |
| 1553 | |
| 1554 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 1555 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1556 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1557 | show_v_b[i] = tbf->dir.dl.v_b[bsn & mod_sns_half]; |
| 1558 | if (show_v_b[i] == 0) |
| 1559 | show_v_b[i] = ' '; |
| 1560 | } |
| 1561 | show_v_b[i] = '\0'; |
| 1562 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 1563 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 1564 | "X=Resend-Unacked\n", tbf->dir.dl.v_a, show_v_b, |
| 1565 | (tbf->dir.dl.v_s - 1) & mod_sns); |
| 1566 | |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 1567 | if (tbf->state_is(GPRS_RLCMAC_FINISHED) |
Andreas Eversberg | 6664a90 | 2012-07-15 06:52:19 +0200 | [diff] [blame] | 1568 | && tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1569 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 1570 | "all blocks, but without final ack " |
| 1571 | "inidcation (don't worry)\n"); |
| 1572 | } |
| 1573 | return 0; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1574 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1575 | |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1576 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 1577 | debug_diagram(tbf->diag, "got Final ACK"); |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 1578 | /* range V(A)..V(S)-1 */ |
| 1579 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 1580 | bsn = (bsn + 1) & mod_sns) { |
| 1581 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] != 'A') |
| 1582 | received++; |
| 1583 | } |
| 1584 | |
| 1585 | /* report all outstanding packets as received */ |
| 1586 | gprs_rlcmac_received_lost(tbf, received, lost); |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 1587 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1588 | /* check for LLC PDU in the LLC Queue */ |
Andreas Eversberg | 24131bf | 2012-07-21 11:09:58 +0200 | [diff] [blame] | 1589 | msg = llc_dequeue(tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1590 | if (!msg) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1591 | /* no message, start T3193, change state to RELEASE */ |
| 1592 | LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we " |
| 1593 | "release.\n"); |
Andreas Eversberg | b3c6f6c | 2012-07-06 07:40:08 +0200 | [diff] [blame] | 1594 | /* start T3193 */ |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1595 | debug_diagram(tbf->diag, "start T3193"); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 1596 | tbf_timer_start(tbf, 3193, bts->t3193_msec / 1000, |
Andreas Eversberg | df4d20e | 2012-09-24 13:49:38 +0200 | [diff] [blame] | 1597 | (bts->t3193_msec % 1000) * 1000); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1598 | tbf_new_state(tbf, GPRS_RLCMAC_WAIT_RELEASE); |
| 1599 | |
| 1600 | return 0; |
| 1601 | } |
| 1602 | memcpy(tbf->llc_frame, msg->data, msg->len); |
| 1603 | tbf->llc_length = msg->len; |
| 1604 | msgb_free(msg); |
| 1605 | |
| 1606 | /* we have a message, so we trigger downlink assignment, and there |
| 1607 | * set the state to ASSIGN. also we set old_downlink, because we |
| 1608 | * re-use this tbf. */ |
| 1609 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, " |
| 1610 | "because another LLC PDU has arrived in between\n"); |
| 1611 | memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); /* reset RLC states */ |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1612 | tbf->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; /* keep TO flags */ |
| 1613 | tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
Holger Hans Peter Freyther | 1b33361 | 2013-10-17 18:26:33 +0200 | [diff] [blame] | 1614 | tbf_update(bts, tbf); |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 1615 | gprs_rlcmac_trigger_downlink_assignment(bts, tbf, tbf, NULL); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1616 | |
| 1617 | return 0; |
| 1618 | } |
| 1619 | |
| 1620 | |
| 1621 | struct msgb *gprs_rlcmac_send_packet_downlink_assignment( |
Holger Hans Peter Freyther | 9f521cd | 2013-10-17 13:48:11 +0200 | [diff] [blame] | 1622 | struct gprs_rlcmac_bts *bts, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1623 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 1624 | { |
| 1625 | struct msgb *msg; |
| 1626 | struct gprs_rlcmac_tbf *new_tbf; |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1627 | int poll_ass_dl = POLLING_ASSIGNMENT_DL; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1628 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1629 | if (poll_ass_dl && tbf->direction == GPRS_RLCMAC_DL_TBF |
| 1630 | && tbf->control_ts != tbf->first_common_ts) { |
| 1631 | LOGP(DRLCMAC, LOGL_NOTICE, "Cannot poll for downlink " |
Andreas Eversberg | f01929b | 2012-10-08 12:40:49 +0200 | [diff] [blame] | 1632 | "assigment, because MS cannot reply. (control TS=%d, " |
| 1633 | "first common TS=%d)\n", tbf->control_ts, |
| 1634 | tbf->first_common_ts); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1635 | poll_ass_dl = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1636 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1637 | if (poll_ass_dl) { |
| 1638 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 1639 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already sheduled " |
| 1640 | "for TBF=%d, so we must wait for downlink " |
| 1641 | "assignment...\n", tbf->tfi); |
| 1642 | return NULL; |
| 1643 | } |
Holger Hans Peter Freyther | 96efa70 | 2013-09-29 07:44:39 +0200 | [diff] [blame] | 1644 | if (sba_find(tbf->trx_no, tbf->control_ts, (fn + 13) % 2715648)) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1645 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 1646 | "scheduled for single block allocation...\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1647 | return NULL; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 1648 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1649 | } |
| 1650 | |
| 1651 | /* on uplink TBF we get the downlink TBF to be assigned. */ |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1652 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| 1653 | /* be sure to check first, if contention resolution is done, |
| 1654 | * otherwise we cannot send the assignment yet */ |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 1655 | if (!tbf->dir.ul.contention_resolution_done) { |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1656 | LOGP(DRLCMAC, LOGL_DEBUG, "Cannot assign DL TBF now, " |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1657 | "because contention resolution is not " |
| 1658 | "finished.\n"); |
| 1659 | return NULL; |
| 1660 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1661 | new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF); |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 1662 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1663 | new_tbf = tbf; |
| 1664 | if (!new_tbf) { |
| 1665 | LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink " |
| 1666 | "assignment at uplink TBF=%d, but there is no downlink " |
| 1667 | "TBF\n", tbf->tfi); |
| 1668 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1669 | return NULL; |
| 1670 | } |
| 1671 | |
| 1672 | msg = msgb_alloc(23, "rlcmac_dl_ass"); |
| 1673 | if (!msg) |
| 1674 | return NULL; |
| 1675 | bitvec *ass_vec = bitvec_alloc(23); |
| 1676 | if (!ass_vec) { |
| 1677 | msgb_free(msg); |
| 1678 | return NULL; |
| 1679 | } |
| 1680 | bitvec_unhex(ass_vec, |
| 1681 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1682 | 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] | 1683 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 1684 | write_packet_downlink_assignment(mac_control_block, tbf->tfi, |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1685 | (tbf->direction == GPRS_RLCMAC_DL_TBF), new_tbf, |
Andreas Eversberg | afdd9e1 | 2012-10-07 17:08:55 +0200 | [diff] [blame] | 1686 | poll_ass_dl, bts->alpha, bts->gamma, -1, 0); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1687 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n"); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 1688 | encode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1689 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 1690 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Downlink Assignment -------------------------\n"); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 1691 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1692 | bitvec_free(ass_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 1693 | talloc_free(mac_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1694 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1695 | if (poll_ass_dl) { |
| 1696 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1697 | tbf->poll_fn = (fn + 13) % 2715648; |
| 1698 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; |
| 1699 | } else { |
| 1700 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1701 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 1702 | tbf_assign_control_ts(new_tbf); |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 1703 | /* stop pending assignment timer */ |
| 1704 | tbf_timer_stop(new_tbf); |
| 1705 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 1706 | } |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1707 | debug_diagram(tbf->diag, "send DL-ASS"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1708 | |
| 1709 | return msg; |
| 1710 | } |
| 1711 | |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 1712 | static void gprs_rlcmac_downlink_assignment(struct gprs_rlcmac_bts *bts, |
| 1713 | gprs_rlcmac_tbf *tbf, uint8_t poll, |
Holger Hans Peter Freyther | 52c911b | 2013-08-24 18:30:54 +0200 | [diff] [blame] | 1714 | const char *imsi) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1715 | { |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1716 | int plen; |
| 1717 | |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 1718 | debug_diagram(tbf->diag, "IMM.ASS (PCH)"); |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1719 | 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] | 1720 | bitvec *immediate_assignment = bitvec_alloc(22); /* without plen */ |
| 1721 | bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1722 | /* use request reference that has maximum distance to current time, |
| 1723 | * so the assignment will not conflict with possible RACH requests. */ |
Holger Hans Peter Freyther | ee7a535 | 2013-10-17 15:41:36 +0200 | [diff] [blame] | 1724 | plen = write_immediate_assignment(bts, immediate_assignment, 1, 125, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 1725 | (tbf->pdch[tbf->first_ts]->last_rts_fn + 21216) % 2715648, tbf->ta, |
| 1726 | 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] | 1727 | tbf->poll_fn, 0, bts->alpha, bts->gamma, -1); |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1728 | pcu_l1if_tx_pch(immediate_assignment, plen, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1729 | bitvec_free(immediate_assignment); |
| 1730 | } |
| 1731 | |
| 1732 | /* 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] | 1733 | void gprs_rlcmac_trigger_downlink_assignment(struct gprs_rlcmac_bts *bts, |
| 1734 | struct gprs_rlcmac_tbf *tbf, |
Holger Hans Peter Freyther | 52c911b | 2013-08-24 18:30:54 +0200 | [diff] [blame] | 1735 | struct gprs_rlcmac_tbf *old_tbf, const char *imsi) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1736 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1737 | #ifdef DEBUG_DL_ASS_IDLE |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1738 | strncpy(debug_imsi, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1739 | LOGP(DRLCMAC, LOGL_ERROR, "**** DEBUGGING DOWNLINK ASSIGNMENT ****\n"); |
| 1740 | #endif |
| 1741 | |
| 1742 | /* stop pending timer */ |
| 1743 | tbf_timer_stop(tbf); |
| 1744 | |
| 1745 | /* check for downlink tbf: */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1746 | if (old_tbf) { |
| 1747 | #ifdef DEBUG_DL_ASS_IDLE |
| 1748 | LOGP(DRLCMAC, LOGL_ERROR, "We must wait for current TBF to be " |
| 1749 | "released.\n"); |
| 1750 | /* wait one second until assignment */ |
| 1751 | tbf_timer_start(tbf, 1234, 1,0); |
| 1752 | #else |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 1753 | LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment on " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 1754 | "PACCH, because %s TBF=%d exists for TLLI=0x%08x\n", |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 1755 | (old_tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 1756 | ? "UL" : "DL", old_tbf->tfi, old_tbf->tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1757 | old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
| 1758 | /* use TA from old TBF */ |
| 1759 | tbf->ta = old_tbf->ta; |
| 1760 | /* change state */ |
| 1761 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 1762 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1763 | /* start timer */ |
| 1764 | tbf_timer_start(tbf, 0, Tassign_pacch); |
| 1765 | #endif |
| 1766 | } else { |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 1767 | LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment for TBF=%d on PCH, no TBF exist (IMSI=%s)\n", tbf->tfi, imsi); |
| 1768 | if (!imsi || strlen(imsi) < 3) { |
| 1769 | LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI!\n"); |
| 1770 | return; |
| 1771 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1772 | /* change state */ |
| 1773 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 1774 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1775 | strncpy(tbf->dir.dl.imsi, imsi, sizeof(tbf->dir.dl.imsi)); |
Andreas Eversberg | 7438df7 | 2012-07-23 18:04:49 +0200 | [diff] [blame] | 1776 | /* send immediate assignment */ |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 1777 | gprs_rlcmac_downlink_assignment(bts, tbf, 0, imsi); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1778 | tbf->dir.dl.wait_confirm = 1; |
| 1779 | } |
| 1780 | } |
| 1781 | |
| 1782 | int gprs_rlcmac_imm_ass_cnf(uint8_t *data, uint32_t fn) |
| 1783 | { |
| 1784 | struct gprs_rlcmac_tbf *tbf; |
| 1785 | uint8_t plen; |
| 1786 | uint32_t tlli; |
| 1787 | |
| 1788 | /* move to IA Rest Octets */ |
| 1789 | plen = data[0] >> 2; |
| 1790 | data += 1 + plen; |
| 1791 | |
| 1792 | if ((*data & 0xf0) != 0xd0) { |
| 1793 | LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but rest " |
| 1794 | "octets do not start with bit sequence 'HH01' " |
| 1795 | "(Packet Downlink Assignment)\n"); |
| 1796 | return -EINVAL; |
| 1797 | } |
| 1798 | |
| 1799 | /* get TLLI from downlink assignment */ |
| 1800 | tlli = (*data++) << 28; |
| 1801 | tlli |= (*data++) << 20; |
| 1802 | tlli |= (*data++) << 12; |
| 1803 | tlli |= (*data++) << 4; |
| 1804 | tlli |= (*data++) >> 4; |
| 1805 | |
| 1806 | tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF); |
| 1807 | if (!tbf) { |
| 1808 | LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but TLLI=%08x " |
| 1809 | "does not exit\n", tlli); |
| 1810 | return -EINVAL; |
| 1811 | } |
| 1812 | |
| 1813 | LOGP(DRLCMAC, LOGL_DEBUG, "Got IMM.ASS confirm for TLLI=%08x\n", tlli); |
| 1814 | |
| 1815 | if (tbf->dir.dl.wait_confirm) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1816 | tbf_timer_start(tbf, 0, Tassign_agch); |
| 1817 | } |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1818 | |
| 1819 | return 0; |
| 1820 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1821 | |