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