Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 1 | /* Data block transfer |
| 2 | * |
| 3 | * Copyright (C) 2012 Ivan Klyuchnikov |
| 4 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version 2 |
| 9 | * of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | */ |
| 20 | |
| 21 | #include <gprs_bssgp_pcu.h> |
| 22 | #include <gprs_rlcmac.h> |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 23 | #include <pcu_l1_if.h> |
Holger Hans Peter Freyther | 67ed34e | 2013-10-17 17:01:54 +0200 | [diff] [blame] | 24 | #include <bts.h> |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 25 | #include <encoding.h> |
Holger Hans Peter Freyther | 8692128 | 2013-08-24 21:26:42 +0200 | [diff] [blame] | 26 | #include <tbf.h> |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 27 | #include <rlc.h> |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 28 | |
Holger Hans Peter Freyther | 7ce21eb | 2013-10-20 08:28:25 +0200 | [diff] [blame] | 29 | static struct gprs_rlcmac_cs gprs_rlcmac_cs[] = { |
| 30 | /* frame length data block max payload */ |
| 31 | { 0, 0, 0 }, |
| 32 | { 23, 23, 20 }, /* CS-1 */ |
| 33 | { 34, 33, 30 }, /* CS-2 */ |
| 34 | { 40, 39, 36 }, /* CS-3 */ |
| 35 | { 54, 53, 50 }, /* CS-4 */ |
| 36 | }; |
| 37 | |
| 38 | |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 39 | extern void *tall_pcu_ctx; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 40 | |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 41 | /* After sending these frames, we poll for ack/nack. */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 42 | #define POLL_ACK_AFTER_FRAMES 20 |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 43 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 44 | /* If acknowledgement to uplink/downlink assignmentshould be polled */ |
| 45 | #define POLLING_ASSIGNMENT_DL 1 |
| 46 | #define POLLING_ASSIGNMENT_UL 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 47 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 48 | |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 49 | static void gprs_rlcmac_downlink_assignment( |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 50 | gprs_rlcmac_tbf *tbf, uint8_t poll, |
Holger Hans Peter Freyther | 52c911b | 2013-08-24 18:30:54 +0200 | [diff] [blame] | 51 | const char *imsi); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 52 | |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 53 | static int gprs_rlcmac_diag(struct gprs_rlcmac_tbf *tbf) |
| 54 | { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 55 | return tbf->rlcmac_diag(); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 56 | } |
| 57 | |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 58 | 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] | 59 | { |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 60 | LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for %s TBF=%d\n", |
| 61 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 62 | |
| 63 | tbf->poll_state = GPRS_RLCMAC_POLL_NONE; |
| 64 | |
| 65 | if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 66 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { |
| 67 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 68 | "PACKET CONTROL ACK for PACKET UPLINK ACK\n"); |
| 69 | gprs_rlcmac_diag(tbf); |
| 70 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); |
| 71 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 72 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 73 | debug_diagram(bts->bts, tbf->diag, "timeout UL-ACK"); |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 74 | if (tbf->state_is(GPRS_RLCMAC_FINISHED)) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 75 | tbf->dir.ul.n3103++; |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 76 | if (tbf->dir.ul.n3103 == bts->n3103) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 77 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 78 | "- N3103 exceeded\n"); |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 79 | debug_diagram(bts->bts, tbf->diag, "N3103 exceeded"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 80 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 81 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 82 | return 0; |
| 83 | } |
| 84 | /* reschedule UL ack */ |
| 85 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 86 | } |
| 87 | } else |
| 88 | if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 89 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| 90 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 91 | "PACKET CONTROL ACK for PACKET UPLINK " |
| 92 | "ASSIGNMENT.\n"); |
| 93 | gprs_rlcmac_diag(tbf); |
| 94 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| 95 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 96 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 97 | debug_diagram(tbf->bts, tbf->diag, "timeout UL-ASS"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 98 | tbf->n3105++; |
| 99 | if (tbf->n3105 == bts->n3105) { |
| 100 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 101 | debug_diagram(bts->bts, tbf->diag, "N3105 exceeded"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 102 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 103 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 104 | return 0; |
| 105 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 106 | /* reschedule UL assignment */ |
| 107 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 108 | } else |
| 109 | if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 110 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| 111 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 112 | "PACKET CONTROL ACK for PACKET DOWNLINK " |
| 113 | "ASSIGNMENT.\n"); |
| 114 | gprs_rlcmac_diag(tbf); |
| 115 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| 116 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 117 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 118 | debug_diagram(bts->bts, tbf->diag, "timeout DL-ASS"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 119 | tbf->n3105++; |
| 120 | if (tbf->n3105 == bts->n3105) { |
| 121 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 122 | debug_diagram(bts->bts, tbf->diag, "N3105 exceeded"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 123 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
| 124 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
| 125 | return 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 126 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 127 | /* reschedule DL assignment */ |
| 128 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 129 | } else |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 130 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) { |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 131 | if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| 132 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 133 | "PACKET DOWNLINK ACK.\n"); |
| 134 | gprs_rlcmac_diag(tbf); |
| 135 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 136 | } |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 137 | debug_diagram(bts->bts, tbf->diag, "timeout DL-ACK"); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 138 | tbf->n3105++; |
| 139 | if (tbf->n3105 == bts->n3105) { |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 140 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 141 | debug_diagram(bts->bts, tbf->diag, "N3105 exceeded"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 142 | tbf_new_state(tbf, GPRS_RLCMAC_RELEASING); |
| 143 | tbf_timer_start(tbf, 3195, bts->t3195, 0); |
| 144 | return 0; |
| 145 | } |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 146 | /* resend IMM.ASS on CCCH on timeout */ |
| 147 | if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)) |
| 148 | && !(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) { |
| 149 | LOGP(DRLCMAC, LOGL_DEBUG, "Re-send dowlink assignment " |
| 150 | "for TBF=%d on PCH (IMSI=%s)\n", tbf->tfi, |
| 151 | tbf->dir.dl.imsi); |
| 152 | /* send immediate assignment */ |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 153 | gprs_rlcmac_downlink_assignment(tbf, 0, tbf->dir.dl.imsi); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 154 | tbf->dir.dl.wait_confirm = 1; |
| 155 | } |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 156 | } else |
| 157 | LOGP(DRLCMAC, LOGL_ERROR, "- Poll Timeout, but no event!\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 158 | |
| 159 | return 0; |
| 160 | } |
| 161 | |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 162 | #ifdef DEBUG_DL_ASS_IDLE |
| 163 | char debug_imsi[16]; |
| 164 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 165 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 166 | /* |
| 167 | * UL data block flow |
| 168 | */ |
| 169 | |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 170 | struct msgb *gprs_rlcmac_send_uplink_ack( |
Holger Hans Peter Freyther | ae947fc | 2013-10-17 13:29:03 +0200 | [diff] [blame] | 171 | struct gprs_rlcmac_tbf *tbf, |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 172 | uint32_t fn) |
| 173 | { |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 174 | int final = (tbf->state_is(GPRS_RLCMAC_FINISHED)); |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 175 | gprs_rlcmac_bts *bts = tbf->bts->bts_data(); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 176 | struct msgb *msg; |
| 177 | |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 178 | if (final) { |
| 179 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 180 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 181 | "sheduled for TBF=%d, so we must wait for " |
| 182 | "final uplink ack...\n", tbf->tfi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 183 | return NULL; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 184 | } |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 185 | if (tbf->bts->sba()->find(tbf->trx_no, tbf->control_ts, (fn + 13) % 2715648)) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 186 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 187 | "scheduled for single block allocation...\n"); |
| 188 | return NULL; |
| 189 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 190 | } |
| 191 | |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 192 | msg = msgb_alloc(23, "rlcmac_ul_ack"); |
| 193 | if (!msg) |
| 194 | return NULL; |
| 195 | bitvec *ack_vec = bitvec_alloc(23); |
| 196 | if (!ack_vec) { |
| 197 | msgb_free(msg); |
| 198 | return NULL; |
| 199 | } |
| 200 | bitvec_unhex(ack_vec, |
| 201 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 202 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 203 | Encoding::write_packet_uplink_ack(bts, mac_control_block, tbf, final); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 204 | encode_gsm_rlcmac_downlink(ack_vec, mac_control_block); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 205 | bitvec_pack(ack_vec, msgb_put(msg, 23)); |
| 206 | bitvec_free(ack_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 207 | talloc_free(mac_control_block); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 208 | |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 209 | /* now we must set this flag, so we are allowed to assign downlink |
| 210 | * TBF on PACCH. it is only allowed when TLLI is aknowledged. */ |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 211 | tbf->dir.ul.contention_resolution_done = 1; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 212 | |
| 213 | if (final) { |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 214 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 215 | tbf->poll_fn = (fn + 13) % 2715648; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 216 | /* waiting for final acknowledge */ |
| 217 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK; |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 218 | tbf->dir.ul.final_ack_sent = 1; |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 219 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 220 | tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 221 | debug_diagram(bts->bts, tbf->diag, "send UL-ACK"); |
Andreas Eversberg | 66690dd | 2012-06-27 15:44:31 +0200 | [diff] [blame] | 222 | |
| 223 | return msg; |
| 224 | } |
| 225 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 226 | struct msgb *gprs_rlcmac_send_packet_uplink_assignment( |
| 227 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 228 | { |
| 229 | struct msgb *msg; |
| 230 | struct gprs_rlcmac_tbf *new_tbf; |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 231 | gprs_rlcmac_bts *bts = tbf->bts->bts_data(); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 232 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 233 | #if POLLING_ASSIGNMENT_UL == 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 234 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 235 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 236 | "sheduled for TBF=%d, so we must wait for uplink " |
| 237 | "assignment...\n", tbf->tfi); |
| 238 | return NULL; |
| 239 | } |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 240 | if (tbf->bts->sba()->find(tbf->trx_no, tbf->control_ts, (fn + 13) % 2715648)) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 241 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already scheduled for " |
| 242 | "single block allocation...\n"); |
| 243 | return NULL; |
| 244 | } |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 245 | #endif |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 246 | |
| 247 | /* on down TBF we get the uplink TBF to be assigned. */ |
| 248 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 249 | new_tbf = tbf->bts->tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 250 | else |
| 251 | new_tbf = tbf; |
| 252 | |
| 253 | if (!new_tbf) { |
| 254 | LOGP(DRLCMACUL, LOGL_ERROR, "We have a schedule for uplink " |
| 255 | "assignment at downlink TBF=%d, but there is no uplink " |
| 256 | "TBF\n", tbf->tfi); |
| 257 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 258 | return NULL; |
| 259 | } |
| 260 | |
| 261 | msg = msgb_alloc(23, "rlcmac_ul_ass"); |
| 262 | if (!msg) |
| 263 | return NULL; |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 264 | 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] | 265 | bitvec *ass_vec = bitvec_alloc(23); |
| 266 | if (!ass_vec) { |
| 267 | msgb_free(msg); |
| 268 | return NULL; |
| 269 | } |
| 270 | bitvec_unhex(ass_vec, |
| 271 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 272 | Encoding::write_packet_uplink_assignment(bts, ass_vec, tbf->tfi, |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 273 | (tbf->direction == GPRS_RLCMAC_DL_TBF), tbf->tlli, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 274 | tbf->tlli_valid, new_tbf, POLLING_ASSIGNMENT_UL, bts->alpha, |
Andreas Eversberg | afdd9e1 | 2012-10-07 17:08:55 +0200 | [diff] [blame] | 275 | bts->gamma, -1); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 276 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 277 | 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] | 278 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Uplink Assignment +++++++++++++++++++++++++\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 279 | decode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 280 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 281 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Uplink Assignment -------------------------\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 282 | bitvec_free(ass_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 283 | talloc_free(mac_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 284 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 285 | #if POLLING_ASSIGNMENT_UL == 1 |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 286 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 287 | tbf->poll_fn = (fn + 13) % 2715648; |
| 288 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK; |
| 289 | #else |
| 290 | tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
Andreas Eversberg | 642c7d3 | 2012-07-23 17:58:55 +0200 | [diff] [blame] | 291 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 292 | tbf_assign_control_ts(new_tbf); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 293 | #endif |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 294 | debug_diagram(bts->bts, tbf->diag, "send UL-ASS"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 295 | |
| 296 | return msg; |
| 297 | } |
| 298 | |
Holger Hans Peter Freyther | b0250eb | 2013-10-17 13:46:19 +0200 | [diff] [blame] | 299 | int gprs_rlcmac_rcv_rach(struct gprs_rlcmac_bts *bts, |
| 300 | uint8_t ra, uint32_t Fn, int16_t qta) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 301 | { |
| 302 | struct gprs_rlcmac_tbf *tbf; |
Andreas Eversberg | 02d7cd2 | 2013-01-15 08:59:34 +0100 | [diff] [blame] | 303 | uint8_t trx, ts = 0; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 304 | int8_t tfi; /* must be signed */ |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 305 | uint8_t sb = 0; |
| 306 | uint32_t sb_fn = 0; |
| 307 | int rc; |
| 308 | uint8_t plen; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 309 | |
| 310 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide " |
| 311 | "one:\n"); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 312 | if ((ra & 0xf8) == 0x70) { |
| 313 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block " |
| 314 | "allocation\n"); |
| 315 | sb = 1; |
| 316 | } else if (bts->force_two_phase) { |
| 317 | LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single phase access, " |
| 318 | "but we force two phase access\n"); |
| 319 | sb = 1; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 320 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 321 | if (qta < 0) |
| 322 | qta = 0; |
| 323 | if (qta > 252) |
| 324 | qta = 252; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 325 | if (sb) { |
Holger Hans Peter Freyther | cedf890 | 2013-10-19 20:47:12 +0200 | [diff] [blame] | 326 | rc = bts->bts->sba()->alloc(&trx, &ts, &sb_fn, qta >> 2); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 327 | if (rc < 0) |
| 328 | return rc; |
| 329 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] RACH qbit-ta=%d " |
| 330 | "ra=0x%02x, Fn=%d (%d,%d,%d)\n", qta, ra, Fn, |
| 331 | (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); |
| 332 | LOGP(DRLCMAC, LOGL_INFO, "TX: Immediate Assignment Uplink " |
| 333 | "(AGCH)\n"); |
| 334 | } else { |
| 335 | // Create new TBF |
Holger Hans Peter Freyther | bcafdf8 | 2013-08-24 21:13:31 +0200 | [diff] [blame] | 336 | #warning "Copy and pate with other routines.." |
Holger Hans Peter Freyther | 70ddde6 | 2013-10-26 19:17:58 +0200 | [diff] [blame^] | 337 | tfi = bts->bts->tfi_find_free(GPRS_RLCMAC_UL_TBF, &trx, -1); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 338 | if (tfi < 0) { |
| 339 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 340 | /* FIXME: send reject */ |
| 341 | return -EBUSY; |
| 342 | } |
| 343 | /* 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] | 344 | 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] | 345 | if (!tbf) { |
| 346 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 347 | /* FIXME: send reject */ |
| 348 | return -EBUSY; |
| 349 | } |
| 350 | tbf->ta = qta >> 2; |
| 351 | tbf_new_state(tbf, GPRS_RLCMAC_FLOW); |
| 352 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH); |
| 353 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
| 354 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] START TFI: %u\n", |
| 355 | tbf->tfi); |
| 356 | LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u RACH " |
| 357 | "qbit-ta=%d ra=0x%02x, Fn=%d (%d,%d,%d)\n", tbf->tfi, |
| 358 | qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); |
| 359 | LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u Immediate " |
| 360 | "Assignment Uplink (AGCH)\n", tbf->tfi); |
| 361 | } |
Andreas Eversberg | 7b04501 | 2012-07-05 07:38:49 +0200 | [diff] [blame] | 362 | bitvec *immediate_assignment = bitvec_alloc(22) /* without plen */; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 363 | bitvec_unhex(immediate_assignment, |
| 364 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 365 | if (sb) |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 366 | plen = Encoding::write_immediate_assignment(bts, immediate_assignment, 0, ra, |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 367 | Fn, qta >> 2, bts->trx[trx].arfcn, ts, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 368 | 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] | 369 | bts->alpha, bts->gamma, -1); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 370 | else |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 371 | plen = Encoding::write_immediate_assignment(bts, immediate_assignment, 0, ra, |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 372 | Fn, tbf->ta, tbf->arfcn, tbf->first_ts, tbf->tsc, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 373 | 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] | 374 | bts->alpha, bts->gamma, -1); |
Andreas Eversberg | 7b04501 | 2012-07-05 07:38:49 +0200 | [diff] [blame] | 375 | pcu_l1if_tx_agch(immediate_assignment, plen); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 376 | bitvec_free(immediate_assignment); |
| 377 | |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 382 | /* send DL data block |
| 383 | * |
| 384 | * The messages are fragmented and forwarded as data blocks. |
| 385 | */ |
| 386 | struct msgb *gprs_rlcmac_send_data_block_acknowledged( |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 387 | struct gprs_rlcmac_tbf *tbf, uint32_t fn, uint8_t ts) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 388 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 389 | struct rlc_dl_header *rh; |
| 390 | struct rlc_li_field *li; |
| 391 | uint8_t block_length; /* total length of block, including spare bits */ |
| 392 | uint8_t block_data; /* usable data of block, w/o spare bits, inc. MAC */ |
| 393 | struct msgb *msg, *dl_msg; |
| 394 | uint8_t bsn; |
| 395 | uint16_t mod_sns = tbf->sns - 1; |
| 396 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 397 | uint16_t index; |
| 398 | uint8_t *delimiter, *data, *e_pointer; |
| 399 | uint8_t len; |
| 400 | uint16_t space, chunk; |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 401 | int first_fin_ack = 0; |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 402 | gprs_rlcmac_bts *bts = tbf->bts->bts_data(); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 403 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 404 | LOGP(DRLCMACDL, LOGL_DEBUG, "DL DATA TBF=%d downlink (V(A)==%d .. " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 405 | "V(S)==%d)\n", tbf->tfi, tbf->dir.dl.v_a, tbf->dir.dl.v_s); |
| 406 | |
| 407 | do_resend: |
| 408 | /* check if there is a block with negative acknowledgement */ |
| 409 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 410 | bsn = (bsn + 1) & mod_sns) { |
| 411 | index = (bsn & mod_sns_half); |
| 412 | if (tbf->dir.dl.v_b[index] == 'N' |
| 413 | || tbf->dir.dl.v_b[index] == 'X') { |
| 414 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", |
| 415 | bsn); |
| 416 | /* re-send block with negative aknowlegement */ |
| 417 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 418 | goto tx_block; |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | /* if the window has stalled, or transfer is complete, |
| 423 | * send an unacknowledged block */ |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 424 | if (tbf->state_is(GPRS_RLCMAC_FINISHED) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 425 | || ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns) == tbf->ws) { |
| 426 | int resend = 0; |
| 427 | |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 428 | if (tbf->state_is(GPRS_RLCMAC_FINISHED)) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 429 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 430 | "because all blocks have been transmitted.\n", |
| 431 | tbf->dir.dl.v_a); |
| 432 | else |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 433 | LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 434 | "because all window is stalled.\n", |
| 435 | tbf->dir.dl.v_a); |
| 436 | /* If V(S) == V(A) and finished state, we would have received |
| 437 | * acknowledgement of all transmitted block. In this case we |
| 438 | * would have transmitted the final block, and received ack |
| 439 | * from MS. But in this case we did not receive the final ack |
| 440 | * indication from MS. This should never happen if MS works |
| 441 | * correctly. */ |
| 442 | if (tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 443 | LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks, " |
| 444 | "so we re-transmit final block!\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 445 | /* we just send final block again */ |
| 446 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 447 | goto tx_block; |
| 448 | } |
| 449 | |
| 450 | /* cycle through all unacked blocks */ |
| 451 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 452 | bsn = (bsn + 1) & mod_sns) { |
| 453 | index = (bsn & mod_sns_half); |
| 454 | if (tbf->dir.dl.v_b[index] == 'U') { |
| 455 | /* mark to be re-send */ |
| 456 | tbf->dir.dl.v_b[index] = 'X'; |
| 457 | resend++; |
| 458 | } |
| 459 | } |
| 460 | /* At this point there should be at leasst one unacked block |
| 461 | * to be resent. If not, this is an software error. */ |
| 462 | if (resend == 0) { |
| 463 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 464 | "There are no unacknowledged blocks, but V(A) " |
| 465 | " != V(S). PLEASE FIX!\n"); |
| 466 | /* we just send final block again */ |
| 467 | index = ((tbf->dir.dl.v_s - 1) & mod_sns_half); |
| 468 | goto tx_block; |
| 469 | } |
| 470 | goto do_resend; |
| 471 | } |
| 472 | |
| 473 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n", |
| 474 | tbf->dir.dl.v_s); |
| 475 | |
| 476 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 477 | index = tbf->dir.dl.v_s & mod_sns_half; |
| 478 | data = tbf->rlc_block[index]; |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 479 | #warning "Selection of the CS doesn't belong here" |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 480 | if (tbf->cs == 0) { |
Andreas Eversberg | 499ff41 | 2012-10-03 14:21:36 +0200 | [diff] [blame] | 481 | tbf->cs = bts->initial_cs_dl; |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 482 | if (tbf->cs < 1 || tbf->cs > 4) |
| 483 | tbf->cs = 1; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 484 | } |
Andreas Eversberg | 3b1332c | 2012-10-03 14:20:53 +0200 | [diff] [blame] | 485 | block_length = gprs_rlcmac_cs[tbf->cs].block_length; |
| 486 | block_data = gprs_rlcmac_cs[tbf->cs].block_data; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 487 | memset(data, 0x2b, block_data); /* spare bits will be left 0 */ |
| 488 | rh = (struct rlc_dl_header *)data; |
| 489 | rh->pt = 0; /* Data Block */ |
| 490 | rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */ |
| 491 | rh->usf = 7; /* will be set at scheduler */ |
| 492 | rh->pr = 0; /* FIXME: power reduction */ |
| 493 | rh->tfi = tbf->tfi; /* TFI */ |
| 494 | rh->fbi = 0; /* Final Block Indicator, set late, if true */ |
| 495 | rh->bsn = tbf->dir.dl.v_s; /* Block Sequence Number */ |
| 496 | rh->e = 0; /* Extension bit, maybe set later */ |
| 497 | e_pointer = data + 2; /* points to E of current chunk */ |
| 498 | data += 3; |
| 499 | delimiter = data; /* where next length header would be stored */ |
| 500 | space = block_data - 3; |
| 501 | while (1) { |
| 502 | chunk = tbf->llc_length - tbf->llc_index; |
| 503 | /* if chunk will exceed block limit */ |
| 504 | if (chunk > space) { |
| 505 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 506 | "larger than space (%d) left in block: copy " |
| 507 | "only remaining space, and we are done\n", |
| 508 | chunk, space); |
| 509 | /* block is filled, so there is no extension */ |
| 510 | *e_pointer |= 0x01; |
| 511 | /* fill only space */ |
| 512 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 513 | /* incement index */ |
| 514 | tbf->llc_index += space; |
| 515 | /* return data block as message */ |
| 516 | break; |
| 517 | } |
| 518 | /* if FINAL chunk would fit precisely in space left */ |
| 519 | if (chunk == space && llist_empty(&tbf->llc_queue)) { |
| 520 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 521 | "would exactly fit into space (%d): because " |
| 522 | "this is a final block, we don't add length " |
| 523 | "header, and we are done\n", chunk, space); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 524 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for " |
| 525 | "TBF=%d that fits precisely in last block: " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 526 | "len=%d\n", tbf->tfi, tbf->llc_length); |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 527 | gprs_rlcmac_dl_bw(tbf, tbf->llc_length); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 528 | /* block is filled, so there is no extension */ |
| 529 | *e_pointer |= 0x01; |
| 530 | /* fill space */ |
| 531 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 532 | /* reset LLC frame */ |
| 533 | tbf->llc_index = tbf->llc_length = 0; |
| 534 | /* final block */ |
| 535 | rh->fbi = 1; /* we indicate final block */ |
| 536 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 537 | /* return data block as message */ |
| 538 | break; |
| 539 | } |
| 540 | /* if chunk would fit exactly in space left */ |
| 541 | if (chunk == space) { |
| 542 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 543 | "would exactly fit into space (%d): add length " |
| 544 | "header with LI=0, to make frame extend to " |
| 545 | "next block, and we are done\n", chunk, space); |
| 546 | /* make space for delimiter */ |
| 547 | if (delimiter != data) |
| 548 | memcpy(delimiter + 1, delimiter, |
| 549 | data - delimiter); |
| 550 | data++; |
| 551 | space--; |
| 552 | /* add LI with 0 length */ |
| 553 | li = (struct rlc_li_field *)delimiter; |
| 554 | li->e = 1; /* not more extension */ |
| 555 | li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| 556 | li->li = 0; /* chunk fills the complete space */ |
| 557 | // no need to set e_pointer nor increase delimiter |
| 558 | /* fill only space, which is 1 octet less than chunk */ |
| 559 | memcpy(data, tbf->llc_frame + tbf->llc_index, space); |
| 560 | /* incement index */ |
| 561 | tbf->llc_index += space; |
| 562 | /* return data block as message */ |
| 563 | break; |
| 564 | } |
| 565 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 566 | "than remaining space (%d): add length header to " |
| 567 | "to delimit LLC frame\n", chunk, space); |
| 568 | /* the LLC frame chunk ends in this block */ |
| 569 | /* make space for delimiter */ |
| 570 | if (delimiter != data) |
| 571 | memcpy(delimiter + 1, delimiter, data - delimiter); |
| 572 | data++; |
| 573 | space--; |
| 574 | /* add LI to delimit frame */ |
| 575 | li = (struct rlc_li_field *)delimiter; |
| 576 | li->e = 0; /* Extension bit, maybe set later */ |
| 577 | li->m = 0; /* will be set later, if there is more LLC data */ |
| 578 | li->li = chunk; /* length of chunk */ |
| 579 | e_pointer = delimiter; /* points to E of current delimiter */ |
| 580 | delimiter++; |
| 581 | /* copy (rest of) LLC frame to space */ |
| 582 | memcpy(data, tbf->llc_frame + tbf->llc_index, chunk); |
| 583 | data += chunk; |
| 584 | space -= chunk; |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 585 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for TBF=%d: " |
| 586 | "len=%d\n", tbf->tfi, tbf->llc_length); |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 587 | gprs_rlcmac_dl_bw(tbf, tbf->llc_length); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 588 | /* reset LLC frame */ |
| 589 | tbf->llc_index = tbf->llc_length = 0; |
| 590 | /* dequeue next LLC frame, if any */ |
Holger Hans Peter Freyther | 1702f10 | 2013-10-20 08:44:02 +0200 | [diff] [blame] | 591 | msg = tbf->llc_dequeue(gprs_bssgp_pcu_current_bctx()); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 592 | if (msg) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 593 | LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC for " |
| 594 | "TBF=%d (len=%d)\n", tbf->tfi, msg->len); |
Holger Hans Peter Freyther | 1702f10 | 2013-10-20 08:44:02 +0200 | [diff] [blame] | 595 | tbf->update_llc_frame(msg); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 596 | msgb_free(msg); |
| 597 | } |
| 598 | /* if we have more data and we have space left */ |
| 599 | if (space > 0 && tbf->llc_length) { |
| 600 | li->m = 1; /* we indicate more frames to follow */ |
| 601 | continue; |
| 602 | } |
| 603 | /* if we don't have more LLC frames */ |
| 604 | if (!tbf->llc_length) { |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 605 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 606 | "done.\n"); |
| 607 | li->e = 1; /* we cannot extend */ |
| 608 | rh->fbi = 1; /* we indicate final block */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 609 | first_fin_ack = 1; |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 610 | /* + 1 indicates: first final ack */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 611 | tbf_new_state(tbf, GPRS_RLCMAC_FINISHED); |
| 612 | break; |
| 613 | } |
| 614 | /* we have no space left */ |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 615 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 616 | "done.\n"); |
| 617 | li->e = 1; /* we cannot extend */ |
| 618 | break; |
| 619 | } |
| 620 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n", |
| 621 | osmo_hexdump(tbf->rlc_block[index], block_length)); |
| 622 | tbf->rlc_block_len[index] = block_length; |
| 623 | /* raise send state and set ack state array */ |
| 624 | tbf->dir.dl.v_b[index] = 'U'; /* unacked */ |
| 625 | tbf->dir.dl.v_s = (tbf->dir.dl.v_s + 1) & mod_sns; /* inc send state */ |
| 626 | |
| 627 | tx_block: |
| 628 | /* from this point on, new block is sent or old block is resent */ |
| 629 | |
| 630 | /* get data and header from current block */ |
| 631 | data = tbf->rlc_block[index]; |
| 632 | len = tbf->rlc_block_len[index]; |
| 633 | rh = (struct rlc_dl_header *)data; |
| 634 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 635 | /* Clear Polling, if still set in history buffer */ |
| 636 | rh->s_p = 0; |
| 637 | |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 638 | /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| 639 | */ |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 640 | if (tbf->dir.dl.tx_counter >= POLL_ACK_AFTER_FRAMES || first_fin_ack) { |
| 641 | if (first_fin_ack) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 642 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 643 | "polling, because first final block sent.\n"); |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 644 | } else { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 645 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 646 | "polling, because %d blocks sent.\n", |
Andreas Eversberg | f54a89e | 2012-07-16 11:56:11 +0200 | [diff] [blame] | 647 | POLL_ACK_AFTER_FRAMES); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 648 | } |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 649 | /* scheduling not possible, because: */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 650 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 651 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already " |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 652 | "sheduled for TBF=%d, so we must wait for " |
| 653 | "requesting downlink ack\n", tbf->tfi); |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 654 | else if (tbf->control_ts != ts) |
| 655 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 656 | "sheduled in this TS %d, waiting for " |
| 657 | "TS %d\n", ts, tbf->control_ts); |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 658 | else if (tbf->bts->sba()->find(tbf->trx_no, ts, (fn + 13) % 2715648)) |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 659 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 660 | "sheduled, because single block alllocation " |
| 661 | "already exists\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 662 | else { |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 663 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling sheduled in this " |
| 664 | "TS %d\n", ts); |
Andreas Eversberg | 5f14bd9 | 2012-10-03 14:20:26 +0200 | [diff] [blame] | 665 | tbf->dir.dl.tx_counter = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 666 | /* start timer whenever we send the final block */ |
| 667 | if (rh->fbi == 1) |
Andreas Eversberg | dfa563c | 2012-07-06 08:13:59 +0200 | [diff] [blame] | 668 | tbf_timer_start(tbf, 3191, bts->t3191, 0); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 669 | |
| 670 | /* schedule polling */ |
| 671 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 672 | tbf->poll_fn = (fn + 13) % 2715648; |
| 673 | |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 674 | #ifdef DEBUG_DIAGRAM |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 675 | debug_diagram(bts->bts, tbf->diag, "poll DL-ACK"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 676 | if (first_fin_ack) |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 677 | debug_diagram(bts->bts, tbf->diag, "(is first FINAL)"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 678 | if (rh->fbi) |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 679 | debug_diagram(bts->bts, tbf->diag, "(FBI is set)"); |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 680 | #endif |
| 681 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 682 | /* set polling in header */ |
| 683 | rh->rrbp = 0; /* N+13 */ |
| 684 | rh->s_p = 1; /* Polling */ |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 685 | |
| 686 | /* Increment TX-counter */ |
| 687 | tbf->dir.dl.tx_counter++; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 688 | } |
Andreas Eversberg | 5e043da | 2012-07-15 06:51:30 +0200 | [diff] [blame] | 689 | } else { |
| 690 | /* Increment TX-counter */ |
| 691 | tbf->dir.dl.tx_counter++; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 692 | } |
| 693 | |
| 694 | /* return data block as message */ |
| 695 | dl_msg = msgb_alloc(len, "rlcmac_dl_data"); |
| 696 | if (!dl_msg) |
| 697 | return NULL; |
| 698 | memcpy(msgb_put(dl_msg, len), data, len); |
| 699 | |
| 700 | return dl_msg; |
| 701 | } |
| 702 | |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 703 | int gprs_rlcmac_downlink_ack( |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 704 | struct gprs_rlcmac_tbf *tbf, uint8_t final, |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 705 | uint8_t ssn, uint8_t *rbb) |
| 706 | { |
| 707 | char show_rbb[65], show_v_b[RLC_MAX_SNS + 1]; |
| 708 | uint16_t mod_sns = tbf->sns - 1; |
| 709 | uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| 710 | int i; /* must be signed */ |
| 711 | int16_t dist; /* must be signed */ |
| 712 | uint8_t bit; |
| 713 | uint16_t bsn; |
| 714 | struct msgb *msg; |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 715 | uint16_t lost = 0, received = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 716 | |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 717 | LOGP(DRLCMACDL, LOGL_DEBUG, "TBF=%d downlink acknowledge\n", |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 718 | tbf->tfi); |
| 719 | |
| 720 | if (!final) { |
| 721 | /* show received array in debug (bit 64..1) */ |
| 722 | for (i = 63; i >= 0; i--) { |
| 723 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 724 | show_rbb[i] = (bit) ? '1' : 'o'; |
| 725 | } |
| 726 | show_rbb[64] = '\0'; |
| 727 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
Andreas Eversberg | 4b470ff | 2012-07-16 12:02:40 +0200 | [diff] [blame] | 728 | "(BSN=%d) 1=ACK o=NACK\n", (ssn - 64) & mod_sns, |
| 729 | show_rbb, (ssn - 1) & mod_sns); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 730 | |
| 731 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 732 | /* calculate distance of ssn from V(S) */ |
| 733 | dist = (tbf->dir.dl.v_s - ssn) & mod_sns; |
| 734 | /* check if distance is less than distance V(A)..V(S) */ |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 735 | 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] | 736 | /* this might happpen, if the downlink assignment |
| 737 | * was not received by ms and the ack refers |
| 738 | * to previous TBF |
| 739 | * FIXME: we should implement polling for |
| 740 | * control ack!*/ |
| 741 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 742 | "V(A)..V(S) range (DL TBF=%d) Free TFB!\n", |
| 743 | tbf->tfi); |
| 744 | return 1; /* indicate to free TBF */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 745 | } |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 746 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
| 747 | for (i = 63, bsn = (ssn - 1) & mod_sns; |
| 748 | i >= 0 && bsn != ((tbf->dir.dl.v_a - 1) & mod_sns); |
| 749 | i--, bsn = (bsn - 1) & mod_sns) { |
| 750 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 751 | if (bit) { |
| 752 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 753 | "ack for BSN=%d\n", bsn); |
| 754 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] |
| 755 | != 'A') |
| 756 | received++; |
| 757 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'A'; |
| 758 | } else { |
| 759 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 760 | "NACK for BSN=%d\n", bsn); |
| 761 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'N'; |
| 762 | lost++; |
| 763 | } |
| 764 | } |
| 765 | /* report lost and received packets */ |
| 766 | gprs_rlcmac_received_lost(tbf, received, lost); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 767 | |
| 768 | /* raise V(A), if possible */ |
| 769 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 770 | i++, bsn = (bsn + 1) & mod_sns) { |
| 771 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] == 'A') { |
| 772 | tbf->dir.dl.v_b[bsn & mod_sns_half] = 'I'; |
| 773 | /* mark invalid */ |
| 774 | tbf->dir.dl.v_a = (tbf->dir.dl.v_a + 1) |
| 775 | & mod_sns; |
| 776 | } else |
| 777 | break; |
| 778 | } |
| 779 | |
| 780 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 781 | for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 782 | i++, bsn = (bsn + 1) & mod_sns) { |
| 783 | show_v_b[i] = tbf->dir.dl.v_b[bsn & mod_sns_half]; |
| 784 | if (show_v_b[i] == 0) |
| 785 | show_v_b[i] = ' '; |
| 786 | } |
| 787 | show_v_b[i] = '\0'; |
| 788 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 789 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 790 | "X=Resend-Unacked\n", tbf->dir.dl.v_a, show_v_b, |
| 791 | (tbf->dir.dl.v_s - 1) & mod_sns); |
| 792 | |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 793 | if (tbf->state_is(GPRS_RLCMAC_FINISHED) |
Andreas Eversberg | 6664a90 | 2012-07-15 06:52:19 +0200 | [diff] [blame] | 794 | && tbf->dir.dl.v_s == tbf->dir.dl.v_a) { |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 795 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 796 | "all blocks, but without final ack " |
| 797 | "inidcation (don't worry)\n"); |
| 798 | } |
| 799 | return 0; |
Andreas Eversberg | b83e2a7 | 2012-10-07 15:26:00 +0200 | [diff] [blame] | 800 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 801 | |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 802 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 803 | debug_diagram(tbf->bts, tbf->diag, "got Final ACK"); |
Andreas Eversberg | 050ace2 | 2013-03-16 16:22:02 +0100 | [diff] [blame] | 804 | /* range V(A)..V(S)-1 */ |
| 805 | for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s; |
| 806 | bsn = (bsn + 1) & mod_sns) { |
| 807 | if (tbf->dir.dl.v_b[bsn & mod_sns_half] != 'A') |
| 808 | received++; |
| 809 | } |
| 810 | |
| 811 | /* report all outstanding packets as received */ |
| 812 | gprs_rlcmac_received_lost(tbf, received, lost); |
Andreas Eversberg | 0c9b50c | 2012-10-07 15:50:51 +0200 | [diff] [blame] | 813 | |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 814 | /* check for LLC PDU in the LLC Queue */ |
Holger Hans Peter Freyther | 1702f10 | 2013-10-20 08:44:02 +0200 | [diff] [blame] | 815 | msg = tbf->llc_dequeue(gprs_bssgp_pcu_current_bctx()); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 816 | if (!msg) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 817 | /* no message, start T3193, change state to RELEASE */ |
| 818 | LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we " |
| 819 | "release.\n"); |
Andreas Eversberg | b3c6f6c | 2012-07-06 07:40:08 +0200 | [diff] [blame] | 820 | /* start T3193 */ |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 821 | debug_diagram(bts->bts, tbf->diag, "start T3193"); |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 822 | tbf_timer_start(tbf, 3193, |
| 823 | tbf->bts->bts_data()->t3193_msec / 1000, |
| 824 | (tbf->bts->bts_data()->t3193_msec % 1000) * 1000); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 825 | tbf_new_state(tbf, GPRS_RLCMAC_WAIT_RELEASE); |
| 826 | |
| 827 | return 0; |
| 828 | } |
Holger Hans Peter Freyther | 1702f10 | 2013-10-20 08:44:02 +0200 | [diff] [blame] | 829 | #warning "Copy and paste on the sender path" |
| 830 | tbf->update_llc_frame(msg); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 831 | msgb_free(msg); |
| 832 | |
| 833 | /* we have a message, so we trigger downlink assignment, and there |
| 834 | * set the state to ASSIGN. also we set old_downlink, because we |
| 835 | * re-use this tbf. */ |
| 836 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, " |
| 837 | "because another LLC PDU has arrived in between\n"); |
| 838 | memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); /* reset RLC states */ |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 839 | tbf->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; /* keep TO flags */ |
| 840 | tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 841 | tbf->update(); |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 842 | gprs_rlcmac_trigger_downlink_assignment(tbf, tbf, NULL); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 843 | |
| 844 | return 0; |
| 845 | } |
| 846 | |
| 847 | |
| 848 | struct msgb *gprs_rlcmac_send_packet_downlink_assignment( |
| 849 | struct gprs_rlcmac_tbf *tbf, uint32_t fn) |
| 850 | { |
| 851 | struct msgb *msg; |
| 852 | struct gprs_rlcmac_tbf *new_tbf; |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 853 | gprs_rlcmac_bts *bts = tbf->bts->bts_data(); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 854 | int poll_ass_dl = POLLING_ASSIGNMENT_DL; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 855 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 856 | if (poll_ass_dl && tbf->direction == GPRS_RLCMAC_DL_TBF |
| 857 | && tbf->control_ts != tbf->first_common_ts) { |
| 858 | LOGP(DRLCMAC, LOGL_NOTICE, "Cannot poll for downlink " |
Andreas Eversberg | f01929b | 2012-10-08 12:40:49 +0200 | [diff] [blame] | 859 | "assigment, because MS cannot reply. (control TS=%d, " |
| 860 | "first common TS=%d)\n", tbf->control_ts, |
| 861 | tbf->first_common_ts); |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 862 | poll_ass_dl = 0; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 863 | } |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 864 | if (poll_ass_dl) { |
| 865 | if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 866 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already sheduled " |
| 867 | "for TBF=%d, so we must wait for downlink " |
| 868 | "assignment...\n", tbf->tfi); |
| 869 | return NULL; |
| 870 | } |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 871 | if (tbf->bts->sba()->find(tbf->trx_no, tbf->control_ts, (fn + 13) % 2715648)) { |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 872 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 873 | "scheduled for single block allocation...\n"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 874 | return NULL; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 875 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 876 | } |
| 877 | |
| 878 | /* on uplink TBF we get the downlink TBF to be assigned. */ |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 879 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
| 880 | /* be sure to check first, if contention resolution is done, |
| 881 | * otherwise we cannot send the assignment yet */ |
Andreas Eversberg | 08e93cd | 2012-07-26 08:13:06 +0200 | [diff] [blame] | 882 | if (!tbf->dir.ul.contention_resolution_done) { |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 883 | LOGP(DRLCMAC, LOGL_DEBUG, "Cannot assign DL TBF now, " |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 884 | "because contention resolution is not " |
| 885 | "finished.\n"); |
| 886 | return NULL; |
| 887 | } |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 888 | new_tbf = tbf->bts->tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF); |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 889 | } else |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 890 | new_tbf = tbf; |
| 891 | if (!new_tbf) { |
| 892 | LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink " |
| 893 | "assignment at uplink TBF=%d, but there is no downlink " |
| 894 | "TBF\n", tbf->tfi); |
| 895 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 896 | return NULL; |
| 897 | } |
| 898 | |
| 899 | msg = msgb_alloc(23, "rlcmac_dl_ass"); |
| 900 | if (!msg) |
| 901 | return NULL; |
| 902 | bitvec *ass_vec = bitvec_alloc(23); |
| 903 | if (!ass_vec) { |
| 904 | msgb_free(msg); |
| 905 | return NULL; |
| 906 | } |
| 907 | bitvec_unhex(ass_vec, |
| 908 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 909 | 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] | 910 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 911 | Encoding::write_packet_downlink_assignment(mac_control_block, tbf->tfi, |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 912 | (tbf->direction == GPRS_RLCMAC_DL_TBF), new_tbf, |
Andreas Eversberg | afdd9e1 | 2012-10-07 17:08:55 +0200 | [diff] [blame] | 913 | poll_ass_dl, bts->alpha, bts->gamma, -1, 0); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 914 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n"); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 915 | encode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 916 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 917 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Downlink Assignment -------------------------\n"); |
Ivan Kluchnikov | ef7f28c | 2012-07-12 14:49:15 +0400 | [diff] [blame] | 918 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 919 | bitvec_free(ass_vec); |
Andreas Eversberg | 6681bb8 | 2012-07-25 08:48:44 +0200 | [diff] [blame] | 920 | talloc_free(mac_control_block); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 921 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 922 | if (poll_ass_dl) { |
| 923 | tbf->poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 924 | tbf->poll_fn = (fn + 13) % 2715648; |
| 925 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; |
| 926 | } else { |
| 927 | tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 928 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 929 | tbf_assign_control_ts(new_tbf); |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 930 | /* stop pending assignment timer */ |
Holger Hans Peter Freyther | 86300bb | 2013-10-26 18:01:35 +0200 | [diff] [blame] | 931 | new_tbf->stop_timer(); |
Andreas Eversberg | cbcd124 | 2012-08-07 15:48:21 +0200 | [diff] [blame] | 932 | |
Andreas Eversberg | 802bb6e | 2012-08-06 11:15:05 +0200 | [diff] [blame] | 933 | } |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 934 | debug_diagram(bts->bts, tbf->diag, "send DL-ASS"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 935 | |
| 936 | return msg; |
| 937 | } |
| 938 | |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 939 | static void gprs_rlcmac_downlink_assignment( |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 940 | gprs_rlcmac_tbf *tbf, uint8_t poll, |
Holger Hans Peter Freyther | 52c911b | 2013-08-24 18:30:54 +0200 | [diff] [blame] | 941 | const char *imsi) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 942 | { |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 943 | gprs_rlcmac_bts *bts = tbf->bts->bts_data(); |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 944 | int plen; |
| 945 | |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 946 | debug_diagram(bts->bts, tbf->diag, "IMM.ASS (PCH)"); |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 947 | 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] | 948 | bitvec *immediate_assignment = bitvec_alloc(22); /* without plen */ |
| 949 | bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 950 | /* use request reference that has maximum distance to current time, |
| 951 | * so the assignment will not conflict with possible RACH requests. */ |
Holger Hans Peter Freyther | 63f29d6 | 2013-10-19 19:04:03 +0200 | [diff] [blame] | 952 | plen = Encoding::write_immediate_assignment(bts, immediate_assignment, 1, 125, |
Andreas Eversberg | aafcbbb | 2012-09-27 09:20:45 +0200 | [diff] [blame] | 953 | (tbf->pdch[tbf->first_ts]->last_rts_fn + 21216) % 2715648, tbf->ta, |
| 954 | 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] | 955 | tbf->poll_fn, 0, bts->alpha, bts->gamma, -1); |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 956 | pcu_l1if_tx_pch(immediate_assignment, plen, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 957 | bitvec_free(immediate_assignment); |
| 958 | } |
| 959 | |
| 960 | /* depending on the current TBF, we assign on PACCH or AGCH */ |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 961 | void gprs_rlcmac_trigger_downlink_assignment( |
Holger Hans Peter Freyther | 344ff48 | 2013-10-17 12:01:04 +0200 | [diff] [blame] | 962 | struct gprs_rlcmac_tbf *tbf, |
Holger Hans Peter Freyther | 52c911b | 2013-08-24 18:30:54 +0200 | [diff] [blame] | 963 | struct gprs_rlcmac_tbf *old_tbf, const char *imsi) |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 964 | { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 965 | #ifdef DEBUG_DL_ASS_IDLE |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 966 | strncpy(debug_imsi, imsi); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 967 | LOGP(DRLCMAC, LOGL_ERROR, "**** DEBUGGING DOWNLINK ASSIGNMENT ****\n"); |
| 968 | #endif |
| 969 | |
| 970 | /* stop pending timer */ |
Holger Hans Peter Freyther | 86300bb | 2013-10-26 18:01:35 +0200 | [diff] [blame] | 971 | tbf->stop_timer(); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 972 | |
| 973 | /* check for downlink tbf: */ |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 974 | if (old_tbf) { |
| 975 | #ifdef DEBUG_DL_ASS_IDLE |
| 976 | LOGP(DRLCMAC, LOGL_ERROR, "We must wait for current TBF to be " |
| 977 | "released.\n"); |
| 978 | /* wait one second until assignment */ |
| 979 | tbf_timer_start(tbf, 1234, 1,0); |
| 980 | #else |
Andreas Eversberg | 0e40309 | 2012-07-06 11:04:57 +0200 | [diff] [blame] | 981 | LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment on " |
Andreas Eversberg | b0c7ea7 | 2012-07-13 14:46:03 +0200 | [diff] [blame] | 982 | "PACCH, because %s TBF=%d exists for TLLI=0x%08x\n", |
Andreas Eversberg | 7f5352c | 2012-07-23 18:20:36 +0200 | [diff] [blame] | 983 | (old_tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 984 | ? "UL" : "DL", old_tbf->tfi, old_tbf->tlli); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 985 | old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
| 986 | /* use TA from old TBF */ |
| 987 | tbf->ta = old_tbf->ta; |
| 988 | /* change state */ |
| 989 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 990 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH); |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 991 | /* start timer */ |
| 992 | tbf_timer_start(tbf, 0, Tassign_pacch); |
| 993 | #endif |
| 994 | } else { |
Andreas Eversberg | e13fa2d | 2012-07-09 17:10:44 +0200 | [diff] [blame] | 995 | LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment for TBF=%d on PCH, no TBF exist (IMSI=%s)\n", tbf->tfi, imsi); |
| 996 | if (!imsi || strlen(imsi) < 3) { |
| 997 | LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI!\n"); |
| 998 | return; |
| 999 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1000 | /* change state */ |
| 1001 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
Andreas Eversberg | 14db19e | 2012-08-06 15:03:03 +0200 | [diff] [blame] | 1002 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1003 | strncpy(tbf->dir.dl.imsi, imsi, sizeof(tbf->dir.dl.imsi)); |
Andreas Eversberg | 7438df7 | 2012-07-23 18:04:49 +0200 | [diff] [blame] | 1004 | /* send immediate assignment */ |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 1005 | gprs_rlcmac_downlink_assignment(tbf, 0, imsi); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1006 | tbf->dir.dl.wait_confirm = 1; |
| 1007 | } |
| 1008 | } |
| 1009 | |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 1010 | int gprs_rlcmac_imm_ass_cnf(BTS *bts, uint8_t *data, uint32_t fn) |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1011 | { |
| 1012 | struct gprs_rlcmac_tbf *tbf; |
| 1013 | uint8_t plen; |
| 1014 | uint32_t tlli; |
| 1015 | |
| 1016 | /* move to IA Rest Octets */ |
| 1017 | plen = data[0] >> 2; |
| 1018 | data += 1 + plen; |
| 1019 | |
| 1020 | if ((*data & 0xf0) != 0xd0) { |
| 1021 | LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but rest " |
| 1022 | "octets do not start with bit sequence 'HH01' " |
| 1023 | "(Packet Downlink Assignment)\n"); |
| 1024 | return -EINVAL; |
| 1025 | } |
| 1026 | |
| 1027 | /* get TLLI from downlink assignment */ |
| 1028 | tlli = (*data++) << 28; |
| 1029 | tlli |= (*data++) << 20; |
| 1030 | tlli |= (*data++) << 12; |
| 1031 | tlli |= (*data++) << 4; |
| 1032 | tlli |= (*data++) >> 4; |
| 1033 | |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 1034 | tbf = bts->tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF); |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1035 | if (!tbf) { |
| 1036 | LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but TLLI=%08x " |
| 1037 | "does not exit\n", tlli); |
| 1038 | return -EINVAL; |
| 1039 | } |
| 1040 | |
| 1041 | LOGP(DRLCMAC, LOGL_DEBUG, "Got IMM.ASS confirm for TLLI=%08x\n", tlli); |
| 1042 | |
| 1043 | if (tbf->dir.dl.wait_confirm) { |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1044 | tbf_timer_start(tbf, 0, Tassign_agch); |
| 1045 | } |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 1046 | |
| 1047 | return 0; |
| 1048 | } |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 1049 | |