Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 1 | /* PDCH scheduler |
| 2 | * |
| 3 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; either version 2 |
| 8 | * of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
| 20 | #include <gprs_bssgp_pcu.h> |
| 21 | #include <gprs_rlcmac.h> |
| 22 | #include <pcu_l1_if.h> |
Holger Hans Peter Freyther | 67ed34e | 2013-10-17 17:01:54 +0200 | [diff] [blame] | 23 | #include <bts.h> |
Holger Hans Peter Freyther | 099535a | 2013-10-16 17:42:31 +0200 | [diff] [blame] | 24 | #include <tbf.h> |
Max | 1187a77 | 2018-01-26 13:31:42 +0100 | [diff] [blame] | 25 | #include <gprs_debug.h> |
| 26 | #include <gprs_ms.h> |
| 27 | #include <rlc.h> |
| 28 | #include <sba.h> |
Max | 6dc90b8 | 2018-02-19 17:17:28 +0100 | [diff] [blame] | 29 | #include <pdch.h> |
Jacob Erlbeck | 502bd1f | 2015-03-20 14:26:05 +0100 | [diff] [blame] | 30 | #include "pcu_utils.h" |
| 31 | |
Max | 1187a77 | 2018-01-26 13:31:42 +0100 | [diff] [blame] | 32 | extern "C" { |
| 33 | #include <osmocom/core/gsmtap.h> |
| 34 | } |
| 35 | |
Jacob Erlbeck | ed2dbf6 | 2015-12-28 19:15:40 +0100 | [diff] [blame] | 36 | static uint32_t sched_poll(BTS *bts, |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 37 | uint8_t trx, uint8_t ts, uint32_t fn, uint8_t block_nr, |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 38 | struct gprs_rlcmac_tbf **poll_tbf, |
Andreas Eversberg | ef42540 | 2012-07-25 15:47:03 +0200 | [diff] [blame] | 39 | struct gprs_rlcmac_tbf **ul_ass_tbf, |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 40 | struct gprs_rlcmac_tbf **dl_ass_tbf, |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 41 | struct gprs_rlcmac_ul_tbf **ul_ack_tbf) |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 42 | { |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 43 | struct gprs_rlcmac_ul_tbf *ul_tbf; |
| 44 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
Jacob Erlbeck | ed2dbf6 | 2015-12-28 19:15:40 +0100 | [diff] [blame] | 45 | LListHead<gprs_rlcmac_tbf> *pos; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 46 | uint32_t poll_fn; |
Andreas Eversberg | e6228b3 | 2012-07-03 13:36:03 +0200 | [diff] [blame] | 47 | |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 48 | /* check special TBF for events */ |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 49 | poll_fn = fn + 4; |
| 50 | if ((block_nr % 3) == 2) |
| 51 | poll_fn ++; |
Max | 9dabfa2 | 2017-05-16 16:10:45 +0200 | [diff] [blame] | 52 | poll_fn = poll_fn % GSM_MAX_FN; |
Jacob Erlbeck | ed2dbf6 | 2015-12-28 19:15:40 +0100 | [diff] [blame] | 53 | llist_for_each(pos, &bts->ul_tbfs()) { |
| 54 | ul_tbf = as_ul_tbf(pos->entry()); |
| 55 | OSMO_ASSERT(ul_tbf); |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 56 | /* this trx, this ts */ |
Jacob Erlbeck | 646da1b | 2016-01-22 17:41:33 +0100 | [diff] [blame] | 57 | if (ul_tbf->trx->trx_no != trx || !ul_tbf->is_control_ts(ts)) |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 58 | continue; |
| 59 | /* polling for next uplink block */ |
Max | cac6b66 | 2018-01-24 11:00:17 +0100 | [diff] [blame] | 60 | if (ul_tbf->poll_scheduled() && ul_tbf->poll_fn == poll_fn) |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 61 | *poll_tbf = ul_tbf; |
Max | 088c7df | 2018-01-23 20:16:23 +0100 | [diff] [blame] | 62 | if (ul_tbf->ul_ack_state_is(GPRS_RLCMAC_UL_ACK_SEND_ACK)) |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 63 | *ul_ack_tbf = ul_tbf; |
Max | 0e59980 | 2018-01-23 20:09:06 +0100 | [diff] [blame] | 64 | if (ul_tbf->dl_ass_state_is(GPRS_RLCMAC_DL_ASS_SEND_ASS)) |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 65 | *dl_ass_tbf = ul_tbf; |
Max | 0e59980 | 2018-01-23 20:09:06 +0100 | [diff] [blame] | 66 | if (ul_tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_SEND_ASS) |
| 67 | || ul_tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ)) |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 68 | *ul_ass_tbf = ul_tbf; |
Max | 5a6bcfb | 2017-09-01 14:36:44 +0200 | [diff] [blame] | 69 | /* FIXME: Is this supposed to be fair? The last TBF for each wins? Maybe use llist_add_tail and skip once we have all |
| 70 | states? */ |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 71 | } |
Jacob Erlbeck | ed2dbf6 | 2015-12-28 19:15:40 +0100 | [diff] [blame] | 72 | llist_for_each(pos, &bts->dl_tbfs()) { |
| 73 | dl_tbf = as_dl_tbf(pos->entry()); |
| 74 | OSMO_ASSERT(dl_tbf); |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 75 | /* this trx, this ts */ |
Jacob Erlbeck | 646da1b | 2016-01-22 17:41:33 +0100 | [diff] [blame] | 76 | if (dl_tbf->trx->trx_no != trx || !dl_tbf->is_control_ts(ts)) |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 77 | continue; |
| 78 | /* polling for next uplink block */ |
Max | cac6b66 | 2018-01-24 11:00:17 +0100 | [diff] [blame] | 79 | if (dl_tbf->poll_scheduled() && dl_tbf->poll_fn == poll_fn) |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 80 | *poll_tbf = dl_tbf; |
Max | 0e59980 | 2018-01-23 20:09:06 +0100 | [diff] [blame] | 81 | if (dl_tbf->dl_ass_state_is(GPRS_RLCMAC_DL_ASS_SEND_ASS)) |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 82 | *dl_ass_tbf = dl_tbf; |
Max | 0e59980 | 2018-01-23 20:09:06 +0100 | [diff] [blame] | 83 | if (dl_tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_SEND_ASS) |
| 84 | || dl_tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ)) |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 85 | *ul_ass_tbf = dl_tbf; |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 86 | } |
| 87 | |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 88 | return poll_fn; |
| 89 | } |
| 90 | |
Holger Hans Peter Freyther | 40fc8f9 | 2013-11-23 23:03:14 +0100 | [diff] [blame] | 91 | static uint8_t sched_select_uplink(uint8_t trx, uint8_t ts, uint32_t fn, |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 92 | uint8_t block_nr, struct gprs_rlcmac_pdch *pdch) |
| 93 | { |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 94 | struct gprs_rlcmac_ul_tbf *tbf; |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 95 | uint8_t usf = 0x07; |
| 96 | uint8_t i, tfi; |
| 97 | |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 98 | /* select uplink resource */ |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 99 | for (i = 0, tfi = pdch->next_ul_tfi; i < 32; |
| 100 | i++, tfi = (tfi + 1) & 31) { |
Daniel Willmann | 1e0c610 | 2014-06-04 14:56:09 +0200 | [diff] [blame] | 101 | tbf = pdch->ul_tbf_by_tfi(tfi); |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 102 | /* no TBF for this tfi, go next */ |
| 103 | if (!tbf) |
| 104 | continue; |
Holger Hans Peter Freyther | 483f77a | 2013-10-16 16:33:00 +0200 | [diff] [blame] | 105 | /* no UL resources needed, go next */ |
| 106 | /* we don't need to give resources in FINISHED state, |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 107 | * because we have received all blocks and only poll |
| 108 | * for packet control ack. */ |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 109 | if (tbf->state_is_not(GPRS_RLCMAC_FLOW)) |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 110 | continue; |
| 111 | |
| 112 | /* use this USF */ |
Daniel Willmann | 7e994e3 | 2014-08-07 15:49:21 +0200 | [diff] [blame] | 113 | usf = tbf->m_usf[ts]; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 114 | LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d " |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 115 | "TS=%d FN=%d block_nr=%d scheduling USF=%d for " |
Holger Hans Peter Freyther | 15bb1a2 | 2013-10-27 12:30:46 +0100 | [diff] [blame] | 116 | "required uplink resource of UL TFI=%d\n", trx, ts, fn, |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 117 | block_nr, usf, tfi); |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 118 | /* next TBF to handle resource is the next one */ |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 119 | pdch->next_ul_tfi = (tfi + 1) & 31; |
| 120 | break; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 121 | } |
| 122 | |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 123 | return usf; |
| 124 | } |
| 125 | |
Holger Hans Peter Freyther | aadfc2e | 2013-12-25 15:19:54 +0100 | [diff] [blame] | 126 | static struct msgb *sched_select_ctrl_msg( |
Holger Hans Peter Freyther | ae947fc | 2013-10-17 13:29:03 +0200 | [diff] [blame] | 127 | uint8_t trx, uint8_t ts, uint32_t fn, |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 128 | uint8_t block_nr, struct gprs_rlcmac_pdch *pdch, |
Andreas Eversberg | ef42540 | 2012-07-25 15:47:03 +0200 | [diff] [blame] | 129 | struct gprs_rlcmac_tbf *ul_ass_tbf, |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 130 | struct gprs_rlcmac_tbf *dl_ass_tbf, |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 131 | struct gprs_rlcmac_ul_tbf *ul_ack_tbf) |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 132 | { |
| 133 | struct msgb *msg = NULL; |
| 134 | struct gprs_rlcmac_tbf *tbf = NULL; |
Holger Hans Peter Freyther | 705653b | 2013-11-26 16:39:28 +0100 | [diff] [blame] | 135 | struct gprs_rlcmac_tbf *next_list[3] = { ul_ass_tbf, dl_ass_tbf, ul_ack_tbf }; |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 136 | |
Holger Hans Peter Freyther | 705653b | 2013-11-26 16:39:28 +0100 | [diff] [blame] | 137 | for (size_t i = 0; i < ARRAY_SIZE(next_list); ++i) { |
| 138 | tbf = next_list[(pdch->next_ctrl_prio + i) % 3]; |
| 139 | if (!tbf) |
| 140 | continue; |
| 141 | |
Jacob Erlbeck | 1ff70c2 | 2016-02-01 19:42:09 +0100 | [diff] [blame] | 142 | /* |
| 143 | * Assignments for the same direction have lower precedence, |
Alexander Couzens | 4acb6b7 | 2016-05-22 01:36:01 +0200 | [diff] [blame] | 144 | * because they may kill the TBF when the CONTROL ACK is |
Jacob Erlbeck | 1ff70c2 | 2016-02-01 19:42:09 +0100 | [diff] [blame] | 145 | * received, thus preventing the others from being processed. |
| 146 | */ |
Max | 0e59980 | 2018-01-23 20:09:06 +0100 | [diff] [blame] | 147 | if (tbf == ul_ass_tbf && tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ)) |
aravind sirsikar | e9a138e | 2017-01-24 12:36:08 +0530 | [diff] [blame] | 148 | msg = ul_ass_tbf->create_packet_access_reject(); |
| 149 | else if (tbf == ul_ass_tbf && tbf->direction == |
| 150 | GPRS_RLCMAC_DL_TBF) |
Max | 0e59980 | 2018-01-23 20:09:06 +0100 | [diff] [blame] | 151 | if (tbf->ul_ass_state_is(GPRS_RLCMAC_UL_ASS_SEND_ASS_REJ)) |
aravind sirsikar | ed3413e | 2016-11-11 17:15:10 +0530 | [diff] [blame] | 152 | msg = ul_ass_tbf->create_packet_access_reject(); |
| 153 | else |
| 154 | msg = ul_ass_tbf->create_ul_ass(fn, ts); |
Jacob Erlbeck | 1ff70c2 | 2016-02-01 19:42:09 +0100 | [diff] [blame] | 155 | else if (tbf == dl_ass_tbf && tbf->direction == GPRS_RLCMAC_UL_TBF) |
Jacob Erlbeck | 5a3c84d | 2016-01-22 17:25:38 +0100 | [diff] [blame] | 156 | msg = dl_ass_tbf->create_dl_ass(fn, ts); |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 157 | else if (tbf == ul_ack_tbf) |
Jacob Erlbeck | 5a3c84d | 2016-01-22 17:25:38 +0100 | [diff] [blame] | 158 | msg = ul_ack_tbf->create_ul_ack(fn, ts); |
Holger Hans Peter Freyther | 705653b | 2013-11-26 16:39:28 +0100 | [diff] [blame] | 159 | |
| 160 | if (!msg) { |
| 161 | tbf = NULL; |
| 162 | continue; |
| 163 | } |
| 164 | |
Jacob Erlbeck | 6e75bc7 | 2015-12-11 16:09:41 +0100 | [diff] [blame] | 165 | pdch->next_ctrl_prio += 1; |
Holger Hans Peter Freyther | 705653b | 2013-11-26 16:39:28 +0100 | [diff] [blame] | 166 | pdch->next_ctrl_prio %= 3; |
| 167 | break; |
Andreas Eversberg | ee31b78 | 2012-07-15 16:27:01 +0200 | [diff] [blame] | 168 | } |
Holger Hans Peter Freyther | 705653b | 2013-11-26 16:39:28 +0100 | [diff] [blame] | 169 | |
Jacob Erlbeck | 1ff70c2 | 2016-02-01 19:42:09 +0100 | [diff] [blame] | 170 | if (!msg) { |
| 171 | /* |
| 172 | * If one of these is left, the response (CONTROL ACK) from the |
| 173 | * MS will kill the current TBF, only one of them can be |
| 174 | * non-NULL |
| 175 | */ |
| 176 | if (dl_ass_tbf) { |
| 177 | tbf = dl_ass_tbf; |
| 178 | msg = dl_ass_tbf->create_dl_ass(fn, ts); |
| 179 | } else if (ul_ass_tbf) { |
| 180 | tbf = ul_ass_tbf; |
| 181 | msg = ul_ass_tbf->create_ul_ass(fn, ts); |
| 182 | } |
| 183 | } |
| 184 | |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 185 | /* any message */ |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 186 | if (msg) { |
Neels Hofmeyr | 3de6d06 | 2017-04-27 01:33:39 +0200 | [diff] [blame] | 187 | if (!tbf) { |
| 188 | LOGP(DRLCMACSCHED, LOGL_ERROR, |
| 189 | "Control message to be scheduled, but no TBF (TRX=%d, TS=%d)\n", trx, ts); |
| 190 | msgb_free(msg); |
| 191 | return NULL; |
| 192 | } |
Holger Hans Peter Freyther | 7a5f3c2 | 2013-11-26 13:08:12 +0100 | [diff] [blame] | 193 | tbf->rotate_in_list(); |
Andreas Eversberg | 592e04a | 2012-07-15 06:25:37 +0200 | [diff] [blame] | 194 | LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling control " |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 195 | "message at RTS for %s (TRX=%d, TS=%d)\n", |
| 196 | tbf_name(tbf), trx, ts); |
sivasankari | da7250a | 2016-12-16 12:57:18 +0530 | [diff] [blame] | 197 | /* Updates the dl ctrl msg counter for ms */ |
| 198 | tbf->ms()->update_dl_ctrl_msg(); |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 199 | return msg; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 200 | } |
Neels Hofmeyr | 3de6d06 | 2017-04-27 01:33:39 +0200 | [diff] [blame] | 201 | |
| 202 | /* schedule PACKET PAGING REQUEST, if any are pending */ |
Holger Hans Peter Freyther | 24e98d0 | 2013-10-19 18:15:44 +0200 | [diff] [blame] | 203 | msg = pdch->packet_paging_request(); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 204 | if (msg) { |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 205 | LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling paging request " |
| 206 | "message at RTS for (TRX=%d, TS=%d)\n", trx, ts); |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 207 | return msg; |
| 208 | } |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 209 | |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 210 | return NULL; |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 211 | } |
| 212 | |
Max | d0532b5 | 2017-12-13 18:27:32 +0100 | [diff] [blame] | 213 | static inline enum tbf_dl_prio tbf_compute_priority(const struct gprs_rlcmac_bts *bts, struct gprs_rlcmac_dl_tbf *tbf, |
| 214 | uint8_t ts, uint32_t fn, int age) |
| 215 | { |
| 216 | const gprs_rlc_dl_window *w = tbf->window(); |
| 217 | int age_thresh1 = msecs_to_frames(200), |
| 218 | age_thresh2 = msecs_to_frames(OSMO_MIN(BTS::TIMER_T3190_MSEC/2, bts->dl_tbf_idle_msec)); |
| 219 | |
| 220 | if (tbf->is_control_ts(ts) && tbf->need_control_ts()) |
| 221 | return DL_PRIO_CONTROL; |
| 222 | |
| 223 | if (tbf->is_control_ts(ts) && age > age_thresh2 && age_thresh2 > 0) |
| 224 | return DL_PRIO_HIGH_AGE; |
| 225 | |
| 226 | if ((tbf->state_is(GPRS_RLCMAC_FLOW) && tbf->have_data()) || w->resend_needed() >= 0) |
| 227 | return DL_PRIO_NEW_DATA; |
| 228 | |
| 229 | if (tbf->is_control_ts(ts) && age > age_thresh1 && tbf->keep_open(fn)) |
| 230 | return DL_PRIO_LOW_AGE; |
| 231 | |
| 232 | if (!w->window_empty()) |
| 233 | return DL_PRIO_SENT_DATA; |
| 234 | |
| 235 | return DL_PRIO_NONE; |
| 236 | } |
| 237 | |
Holger Hans Peter Freyther | 4ffc260 | 2013-10-17 15:21:10 +0200 | [diff] [blame] | 238 | static struct msgb *sched_select_downlink(struct gprs_rlcmac_bts *bts, |
| 239 | uint8_t trx, uint8_t ts, uint32_t fn, |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 240 | uint8_t block_nr, struct gprs_rlcmac_pdch *pdch) |
| 241 | { |
| 242 | struct msgb *msg = NULL; |
Jacob Erlbeck | 0eabffd | 2015-03-02 14:28:12 +0100 | [diff] [blame] | 243 | struct gprs_rlcmac_dl_tbf *tbf, *prio_tbf = NULL; |
Max | d0532b5 | 2017-12-13 18:27:32 +0100 | [diff] [blame] | 244 | enum tbf_dl_prio prio, max_prio = DL_PRIO_NONE; |
Jacob Erlbeck | 502bd1f | 2015-03-20 14:26:05 +0100 | [diff] [blame] | 245 | |
Jacob Erlbeck | 0eabffd | 2015-03-02 14:28:12 +0100 | [diff] [blame] | 246 | uint8_t i, tfi, prio_tfi; |
Jacob Erlbeck | 502bd1f | 2015-03-20 14:26:05 +0100 | [diff] [blame] | 247 | int age; |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 248 | |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 249 | /* select downlink resource */ |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 250 | for (i = 0, tfi = pdch->next_dl_tfi; i < 32; |
| 251 | i++, tfi = (tfi + 1) & 31) { |
Daniel Willmann | 1e0c610 | 2014-06-04 14:56:09 +0200 | [diff] [blame] | 252 | tbf = pdch->dl_tbf_by_tfi(tfi); |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 253 | /* no TBF for this tfi, go next */ |
| 254 | if (!tbf) |
| 255 | continue; |
| 256 | /* no DL TBF, go next */ |
| 257 | if (tbf->direction != GPRS_RLCMAC_DL_TBF) |
| 258 | continue; |
Holger Hans Peter Freyther | 483f77a | 2013-10-16 16:33:00 +0200 | [diff] [blame] | 259 | /* no DL resources needed, go next */ |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 260 | if (tbf->state_is_not(GPRS_RLCMAC_FLOW) |
| 261 | && tbf->state_is_not(GPRS_RLCMAC_FINISHED)) |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 262 | continue; |
| 263 | |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 264 | /* waiting for CCCH IMM.ASS confirm */ |
Daniel Willmann | 7e994e3 | 2014-08-07 15:49:21 +0200 | [diff] [blame] | 265 | if (tbf->m_wait_confirm) |
Andreas Eversberg | a9be154 | 2012-09-27 09:23:24 +0200 | [diff] [blame] | 266 | continue; |
| 267 | |
Jacob Erlbeck | 502bd1f | 2015-03-20 14:26:05 +0100 | [diff] [blame] | 268 | age = tbf->frames_since_last_poll(fn); |
| 269 | |
Jacob Erlbeck | 0eabffd | 2015-03-02 14:28:12 +0100 | [diff] [blame] | 270 | /* compute priority */ |
Max | d0532b5 | 2017-12-13 18:27:32 +0100 | [diff] [blame] | 271 | prio = tbf_compute_priority(bts, tbf, ts, fn, age); |
| 272 | if (prio == DL_PRIO_NONE) |
Jacob Erlbeck | 502bd1f | 2015-03-20 14:26:05 +0100 | [diff] [blame] | 273 | continue; |
Jacob Erlbeck | 0eabffd | 2015-03-02 14:28:12 +0100 | [diff] [blame] | 274 | |
| 275 | /* get the TBF with the highest priority */ |
| 276 | if (prio > max_prio) { |
| 277 | prio_tfi = tfi; |
| 278 | prio_tbf = tbf; |
| 279 | max_prio = prio; |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | if (prio_tbf) { |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 284 | LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling data message at " |
Jacob Erlbeck | 502bd1f | 2015-03-20 14:26:05 +0100 | [diff] [blame] | 285 | "RTS for DL TFI=%d (TRX=%d, TS=%d) prio=%d\n", |
| 286 | prio_tfi, trx, ts, max_prio); |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 287 | /* next TBF to handle resource is the next one */ |
Jacob Erlbeck | 0eabffd | 2015-03-02 14:28:12 +0100 | [diff] [blame] | 288 | pdch->next_dl_tfi = (prio_tfi + 1) & 31; |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 289 | /* generate DL data block */ |
Jacob Erlbeck | 0eabffd | 2015-03-02 14:28:12 +0100 | [diff] [blame] | 290 | msg = prio_tbf->create_dl_acked_block(fn, ts); |
Andreas Eversberg | 3b7461c | 2012-07-20 11:19:59 +0200 | [diff] [blame] | 291 | } |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 292 | |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 293 | return msg; |
| 294 | } |
Holger Hans Peter Freyther | 40fc8f9 | 2013-11-23 23:03:14 +0100 | [diff] [blame] | 295 | |
| 296 | static const uint8_t rlcmac_dl_idle[23] = { |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 297 | 0x47, /* control without optional header octets, no polling, USF=111 */ |
| 298 | 0x94, /* dummy downlink control message, paging mode 00 */ |
| 299 | 0x2b, /* no persistance level, 7 bits spare pattern */ |
| 300 | 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, |
| 301 | 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b |
| 302 | }; |
| 303 | |
Holger Hans Peter Freyther | 40fc8f9 | 2013-11-23 23:03:14 +0100 | [diff] [blame] | 304 | static struct msgb *sched_dummy(void) |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 305 | { |
| 306 | struct msgb *msg; |
| 307 | |
| 308 | msg = msgb_alloc(23, "rlcmac_dl_idle"); |
| 309 | if (!msg) |
| 310 | return NULL; |
| 311 | memcpy(msgb_put(msg, 23), rlcmac_dl_idle, 23); |
| 312 | |
| 313 | return msg; |
| 314 | } |
| 315 | |
Max | 8bfa659 | 2017-08-31 15:42:06 +0200 | [diff] [blame] | 316 | static inline void tap_n_acc(const struct msgb *msg, const struct gprs_rlcmac_bts *bts, uint8_t trx, uint8_t ts, |
| 317 | uint32_t fn, enum pcu_gsmtap_category cat) |
| 318 | { |
| 319 | if (!msg) |
| 320 | return; |
| 321 | |
| 322 | switch(cat) { |
| 323 | case PCU_GSMTAP_C_DL_CTRL: |
| 324 | bts->bts->rlc_sent_control(); |
| 325 | bts->bts->send_gsmtap(PCU_GSMTAP_C_DL_CTRL, false, trx, ts, GSMTAP_CHANNEL_PACCH, fn, msg->data, |
| 326 | msg->len); |
| 327 | break; |
| 328 | case PCU_GSMTAP_C_DL_DATA_GPRS: |
| 329 | bts->bts->rlc_sent(); |
| 330 | /* FIXME: distinguish between GPRS and EGPRS */ |
| 331 | bts->bts->send_gsmtap(PCU_GSMTAP_C_DL_DATA_GPRS, false, trx, ts, GSMTAP_CHANNEL_PDTCH, fn, msg->data, |
| 332 | msg->len); |
| 333 | break; |
| 334 | case PCU_GSMTAP_C_DL_DUMMY: |
| 335 | bts->bts->rlc_sent_dummy(); |
| 336 | bts->bts->send_gsmtap(PCU_GSMTAP_C_DL_DUMMY, false, trx, ts, GSMTAP_CHANNEL_PACCH, fn, msg->data, |
| 337 | msg->len); |
| 338 | break; |
| 339 | default: |
| 340 | break; |
| 341 | } |
| 342 | } |
| 343 | |
Holger Hans Peter Freyther | b19d726 | 2013-10-17 18:12:18 +0200 | [diff] [blame] | 344 | int gprs_rlcmac_rcv_rts_block(struct gprs_rlcmac_bts *bts, |
Max | 878bd1f | 2016-07-20 13:05:05 +0200 | [diff] [blame] | 345 | uint8_t trx, uint8_t ts, |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 346 | uint32_t fn, uint8_t block_nr) |
| 347 | { |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 348 | struct gprs_rlcmac_pdch *pdch; |
| 349 | struct gprs_rlcmac_tbf *poll_tbf = NULL, *dl_ass_tbf = NULL, |
Daniel Willmann | 4f3c420 | 2014-08-07 14:58:59 +0200 | [diff] [blame] | 350 | *ul_ass_tbf = NULL; |
| 351 | struct gprs_rlcmac_ul_tbf *ul_ack_tbf = NULL; |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 352 | uint8_t usf = 0x7; |
| 353 | struct msgb *msg = NULL; |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 354 | uint32_t poll_fn, sba_fn; |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 355 | |
| 356 | if (trx >= 8 || ts >= 8) |
| 357 | return -EINVAL; |
| 358 | pdch = &bts->trx[trx].pdch[ts]; |
| 359 | |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 360 | if (!pdch->is_enabled()) { |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 361 | LOGP(DRLCMACSCHED, LOGL_ERROR, "Received RTS on disabled PDCH: " |
| 362 | "TRX=%d TS=%d\n", trx, ts); |
| 363 | return -EIO; |
| 364 | } |
| 365 | |
| 366 | /* store last frame number of RTS */ |
| 367 | pdch->last_rts_fn = fn; |
| 368 | |
Jacob Erlbeck | ed2dbf6 | 2015-12-28 19:15:40 +0100 | [diff] [blame] | 369 | poll_fn = sched_poll(bts->bts, trx, ts, fn, block_nr, &poll_tbf, &ul_ass_tbf, |
Andreas Eversberg | ef42540 | 2012-07-25 15:47:03 +0200 | [diff] [blame] | 370 | &dl_ass_tbf, &ul_ack_tbf); |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 371 | /* check uplink resource for polling */ |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 372 | if (poll_tbf) |
| 373 | LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d " |
| 374 | "TS=%d FN=%d block_nr=%d scheduling free USF for " |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 375 | "polling at FN=%d of %s\n", trx, ts, fn, |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 376 | block_nr, poll_fn, |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 377 | tbf_name(poll_tbf)); |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 378 | /* use free USF */ |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 379 | /* else. check for sba */ |
Holger Hans Peter Freyther | cedf890 | 2013-10-19 20:47:12 +0200 | [diff] [blame] | 380 | else if ((sba_fn = bts->bts->sba()->sched(trx, ts, fn, block_nr) != 0xffffffff)) |
Andreas Eversberg | 07e97cf | 2012-08-07 16:00:56 +0200 | [diff] [blame] | 381 | LOGP(DRLCMACSCHED, LOGL_DEBUG, "Received RTS for PDCH: TRX=%d " |
| 382 | "TS=%d FN=%d block_nr=%d scheduling free USF for " |
| 383 | "single block allocation at FN=%d\n", trx, ts, fn, |
| 384 | block_nr, sba_fn); |
| 385 | /* use free USF */ |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 386 | /* else, we search for uplink resource */ |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 387 | else |
| 388 | usf = sched_select_uplink(trx, ts, fn, block_nr, pdch); |
| 389 | |
| 390 | /* Prio 1: select control message */ |
Holger Hans Peter Freyther | aadfc2e | 2013-12-25 15:19:54 +0100 | [diff] [blame] | 391 | msg = sched_select_ctrl_msg(trx, ts, fn, block_nr, pdch, ul_ass_tbf, |
Andreas Eversberg | ef42540 | 2012-07-25 15:47:03 +0200 | [diff] [blame] | 392 | dl_ass_tbf, ul_ack_tbf); |
Max | 8bfa659 | 2017-08-31 15:42:06 +0200 | [diff] [blame] | 393 | tap_n_acc(msg, bts, trx, ts, fn, PCU_GSMTAP_C_DL_CTRL); |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 394 | |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 395 | /* Prio 2: select data message for downlink */ |
Alexander Couzens | 9736d00 | 2016-05-18 16:41:03 +0200 | [diff] [blame] | 396 | if (!msg) { |
Holger Hans Peter Freyther | 4ffc260 | 2013-10-17 15:21:10 +0200 | [diff] [blame] | 397 | msg = sched_select_downlink(bts, trx, ts, fn, block_nr, pdch); |
Max | 8bfa659 | 2017-08-31 15:42:06 +0200 | [diff] [blame] | 398 | tap_n_acc(msg, bts, trx, ts, fn, PCU_GSMTAP_C_DL_DATA_GPRS); |
Alexander Couzens | 9736d00 | 2016-05-18 16:41:03 +0200 | [diff] [blame] | 399 | } |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 400 | |
| 401 | /* Prio 3: send dummy contol message */ |
Alexander Couzens | 2cb1547 | 2016-05-18 16:43:10 +0200 | [diff] [blame] | 402 | if (!msg) { |
| 403 | /* increase counter */ |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 404 | msg = sched_dummy(); |
Max | 8bfa659 | 2017-08-31 15:42:06 +0200 | [diff] [blame] | 405 | tap_n_acc(msg, bts, trx, ts, fn, PCU_GSMTAP_C_DL_DUMMY); |
Alexander Couzens | 2cb1547 | 2016-05-18 16:43:10 +0200 | [diff] [blame] | 406 | } |
Andreas Eversberg | d6a8db6 | 2012-07-25 08:38:21 +0200 | [diff] [blame] | 407 | |
| 408 | if (!msg) |
| 409 | return -ENOMEM; |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 410 | /* msg is now available */ |
Alexander Couzens | 7fdbf89 | 2016-05-21 19:45:23 +0200 | [diff] [blame] | 411 | bts->bts->rlc_dl_bytes(msg->data_len); |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 412 | |
| 413 | /* set USF */ |
Jacob Erlbeck | 580edbc | 2015-12-28 14:10:14 +0100 | [diff] [blame] | 414 | OSMO_ASSERT(msgb_length(msg) > 0); |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 415 | msg->data[0] = (msg->data[0] & 0xf8) | usf; |
| 416 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 417 | /* Used to measure the leak rate, count all blocks */ |
| 418 | gprs_bssgp_update_frames_sent(); |
| 419 | |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 420 | /* send PDTCH/PACCH to L1 */ |
Max | 878bd1f | 2016-07-20 13:05:05 +0200 | [diff] [blame] | 421 | pcu_l1if_tx_pdtch(msg, trx, ts, bts->trx[trx].arfcn, fn, block_nr); |
Andreas Eversberg | 39621c4 | 2012-06-27 15:36:27 +0200 | [diff] [blame] | 422 | |
| 423 | return 0; |
| 424 | } |