Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 1 | /* GSM Channel allocation routines |
| 2 | * |
| 3 | * (C) 2008 by Harald Welte <laforge@gnumonks.org> |
Holger Freyther | e64a7a3 | 2009-02-06 21:55:37 +0000 | [diff] [blame] | 4 | * (C) 2008, 2009 by Holger Hans Peter Freyther <zecke@selfish.org> |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 5 | * |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 9 | * it under the terms of the GNU Affero General Public License as published by |
| 10 | * the Free Software Foundation; either version 3 of the License, or |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 16 | * GNU Affero General Public License for more details. |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 17 | * |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 18 | * You should have received a copy of the GNU Affero General Public License |
| 19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
| 26 | #include <errno.h> |
| 27 | |
Neels Hofmeyr | c016479 | 2017-09-04 15:15:32 +0200 | [diff] [blame] | 28 | #include <osmocom/bsc/gsm_subscriber.h> |
| 29 | #include <osmocom/bsc/chan_alloc.h> |
| 30 | #include <osmocom/bsc/abis_nm.h> |
| 31 | #include <osmocom/bsc/abis_rsl.h> |
| 32 | #include <osmocom/bsc/debug.h> |
| 33 | #include <osmocom/bsc/rtp_proxy.h> |
| 34 | #include <osmocom/bsc/signal.h> |
| 35 | #include <osmocom/bsc/gsm_04_08_utils.h> |
Holger Freyther | c6ea9db | 2008-12-30 19:18:21 +0000 | [diff] [blame] | 36 | |
Pablo Neira Ayuso | 136f453 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 37 | #include <osmocom/core/talloc.h> |
Holger Hans Peter Freyther | 5ba05f4 | 2010-06-22 12:11:59 +0800 | [diff] [blame] | 38 | |
Max | d0ff694 | 2017-11-29 12:45:34 +0100 | [diff] [blame^] | 39 | static bool ts_is_usable(const struct gsm_bts_trx_ts *ts) |
Harald Welte | 4c70454 | 2009-12-24 10:10:16 +0100 | [diff] [blame] | 40 | { |
| 41 | /* FIXME: How does this behave for BS-11 ? */ |
| 42 | if (is_ipaccess_bts(ts->trx->bts)) { |
Harald Welte | d64c0bc | 2011-05-30 12:07:53 +0200 | [diff] [blame] | 43 | if (!nm_is_running(&ts->mo.nm_state)) |
Max | d0ff694 | 2017-11-29 12:45:34 +0100 | [diff] [blame^] | 44 | return false; |
Harald Welte | 4c70454 | 2009-12-24 10:10:16 +0100 | [diff] [blame] | 45 | } |
| 46 | |
Neels Hofmeyr | c6926d0 | 2016-07-14 02:51:13 +0200 | [diff] [blame] | 47 | /* If a TCH/F_PDCH TS is busy changing, it is already taken or not |
Neels Hofmeyr | 832afa3 | 2016-06-14 13:12:00 +0200 | [diff] [blame] | 48 | * yet available. */ |
| 49 | if (ts->pchan == GSM_PCHAN_TCH_F_PDCH) { |
| 50 | if (ts->flags & TS_F_PDCH_PENDING_MASK) |
Max | d0ff694 | 2017-11-29 12:45:34 +0100 | [diff] [blame^] | 51 | return false; |
Neels Hofmeyr | 832afa3 | 2016-06-14 13:12:00 +0200 | [diff] [blame] | 52 | } |
| 53 | |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 54 | /* If a dynamic channel is busy changing, it is already taken or not |
| 55 | * yet available. */ |
| 56 | if (ts->pchan == GSM_PCHAN_TCH_F_TCH_H_PDCH) { |
| 57 | if (ts->dyn.pchan_is != ts->dyn.pchan_want) |
Max | d0ff694 | 2017-11-29 12:45:34 +0100 | [diff] [blame^] | 58 | return false; |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 59 | } |
| 60 | |
Max | d0ff694 | 2017-11-29 12:45:34 +0100 | [diff] [blame^] | 61 | return true; |
Harald Welte | 4c70454 | 2009-12-24 10:10:16 +0100 | [diff] [blame] | 62 | } |
| 63 | |
Max | d0ff694 | 2017-11-29 12:45:34 +0100 | [diff] [blame^] | 64 | bool trx_is_usable(const struct gsm_bts_trx *trx) |
Harald Welte | 4c70454 | 2009-12-24 10:10:16 +0100 | [diff] [blame] | 65 | { |
| 66 | /* FIXME: How does this behave for BS-11 ? */ |
| 67 | if (is_ipaccess_bts(trx->bts)) { |
Harald Welte | d64c0bc | 2011-05-30 12:07:53 +0200 | [diff] [blame] | 68 | if (!nm_is_running(&trx->mo.nm_state) || |
| 69 | !nm_is_running(&trx->bb_transc.mo.nm_state)) |
Max | d0ff694 | 2017-11-29 12:45:34 +0100 | [diff] [blame^] | 70 | return false; |
Harald Welte | 4c70454 | 2009-12-24 10:10:16 +0100 | [diff] [blame] | 71 | } |
| 72 | |
Max | d0ff694 | 2017-11-29 12:45:34 +0100 | [diff] [blame^] | 73 | return true; |
Harald Welte | 4c70454 | 2009-12-24 10:10:16 +0100 | [diff] [blame] | 74 | } |
| 75 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 76 | static struct gsm_lchan * |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 77 | _lc_find_trx(struct gsm_bts_trx *trx, enum gsm_phys_chan_config pchan, |
| 78 | enum gsm_phys_chan_config dyn_as_pchan) |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 79 | { |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 80 | struct gsm_bts_trx_ts *ts; |
Andreas Eversberg | 0434efa | 2013-10-11 13:05:16 +0200 | [diff] [blame] | 81 | int j, start, stop, dir, ss; |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 82 | int check_subslots; |
Harald Welte | 8836726 | 2009-08-10 13:25:55 +0200 | [diff] [blame] | 83 | |
Harald Welte | 4c70454 | 2009-12-24 10:10:16 +0100 | [diff] [blame] | 84 | if (!trx_is_usable(trx)) |
| 85 | return NULL; |
| 86 | |
Andreas Eversberg | 0434efa | 2013-10-11 13:05:16 +0200 | [diff] [blame] | 87 | if (trx->bts->chan_alloc_reverse) { |
| 88 | /* check TS 7..0 */ |
| 89 | start = 7; |
| 90 | stop = -1; |
| 91 | dir = -1; |
| 92 | } else { |
| 93 | /* check TS 0..7 */ |
| 94 | start = 0; |
| 95 | stop = 8; |
| 96 | dir = 1; |
| 97 | } |
| 98 | |
| 99 | for (j = start; j != stop; j += dir) { |
Harald Welte | fc0d952 | 2009-08-10 13:46:55 +0200 | [diff] [blame] | 100 | ts = &trx->ts[j]; |
Harald Welte | 4c70454 | 2009-12-24 10:10:16 +0100 | [diff] [blame] | 101 | if (!ts_is_usable(ts)) |
| 102 | continue; |
Neels Hofmeyr | a668525 | 2016-06-06 12:53:25 +0200 | [diff] [blame] | 103 | if (ts->pchan != pchan) |
Harald Welte | fc0d952 | 2009-08-10 13:46:55 +0200 | [diff] [blame] | 104 | continue; |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 105 | |
| 106 | /* |
| 107 | * Allocation for fully dynamic timeslots |
| 108 | * (does not apply for ip.access style GSM_PCHAN_TCH_F_PDCH) |
| 109 | * |
| 110 | * Note the special nature of a dynamic timeslot in PDCH mode: |
| 111 | * in PDCH mode, typically, lchan->type is GSM_LCHAN_NONE and |
| 112 | * lchan->state is LCHAN_S_NONE -- an otherwise unused slot |
| 113 | * becomes PDCH implicitly. In the same sense, this channel |
| 114 | * allocator will never be asked to find an available PDCH |
| 115 | * slot; only TCH/F or TCH/H will be requested, and PDCH mode |
| 116 | * means that it is available for switchover. |
| 117 | * |
| 118 | * A dynamic timeslot in PDCH mode may be switched to TCH/F or |
| 119 | * TCH/H. If a dyn TS is already in TCH/F or TCH/H mode, it |
| 120 | * means that it is in use and its mode can't be switched. |
| 121 | * |
| 122 | * The logic concerning channels for TCH/F is trivial: there is |
| 123 | * only one channel, so a dynamic TS in TCH/F mode is already |
| 124 | * taken and not available for allocation. For TCH/H, we need |
| 125 | * to check whether a dynamic timeslot is already in TCH/H mode |
| 126 | * and whether one of the two channels is still available. |
| 127 | */ |
Neels Hofmeyr | e14f4b9 | 2016-12-05 16:48:36 +0100 | [diff] [blame] | 128 | switch (pchan) { |
| 129 | case GSM_PCHAN_TCH_F_TCH_H_PDCH: |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 130 | if (ts->dyn.pchan_is != ts->dyn.pchan_want) { |
| 131 | /* The TS's mode is being switched. Not |
| 132 | * available anymore/yet. */ |
| 133 | DEBUGP(DRLL, "%s already in switchover\n", |
| 134 | gsm_ts_and_pchan_name(ts)); |
| 135 | continue; |
| 136 | } |
| 137 | if (ts->dyn.pchan_is == GSM_PCHAN_PDCH) { |
| 138 | /* This slot is available. Still check for |
| 139 | * error states to be sure; in all cases the |
| 140 | * first lchan will be used. */ |
| 141 | if (ts->lchan->state != LCHAN_S_NONE |
| 142 | && ts->lchan->state != LCHAN_S_ACTIVE) |
| 143 | continue; |
| 144 | return ts->lchan; |
| 145 | } |
Neels Hofmeyr | e14f4b9 | 2016-12-05 16:48:36 +0100 | [diff] [blame] | 146 | if (ts->dyn.pchan_is != dyn_as_pchan) |
| 147 | /* not applicable. */ |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 148 | continue; |
Neels Hofmeyr | e14f4b9 | 2016-12-05 16:48:36 +0100 | [diff] [blame] | 149 | /* The requested type matches the dynamic timeslot's |
| 150 | * current mode. A channel may still be available |
| 151 | * (think TCH/H). */ |
| 152 | check_subslots = ts_subslots(ts); |
| 153 | break; |
| 154 | |
Neels Hofmeyr | 8825c69 | 2016-12-05 16:50:47 +0100 | [diff] [blame] | 155 | case GSM_PCHAN_TCH_F_PDCH: |
| 156 | /* Available for voice when in PDCH mode */ |
| 157 | if (ts_pchan(ts) != GSM_PCHAN_PDCH) |
| 158 | continue; |
| 159 | /* Subslots of a PDCH ts don't need to be checked. */ |
| 160 | return ts->lchan; |
| 161 | |
Neels Hofmeyr | e14f4b9 | 2016-12-05 16:48:36 +0100 | [diff] [blame] | 162 | default: |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 163 | /* Not a dynamic channel, there is only one pchan kind: */ |
Neels Hofmeyr | 5486025 | 2016-07-29 18:13:38 +0200 | [diff] [blame] | 164 | check_subslots = ts_subslots(ts); |
Neels Hofmeyr | e14f4b9 | 2016-12-05 16:48:36 +0100 | [diff] [blame] | 165 | break; |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 166 | } |
| 167 | |
| 168 | /* Is a sub-slot still available? */ |
| 169 | for (ss = 0; ss < check_subslots; ss++) { |
Harald Welte | fc0d952 | 2009-08-10 13:46:55 +0200 | [diff] [blame] | 170 | struct gsm_lchan *lc = &ts->lchan[ss]; |
Harald Welte (local) | 3e46031 | 2009-12-27 18:12:29 +0100 | [diff] [blame] | 171 | if (lc->type == GSM_LCHAN_NONE && |
| 172 | lc->state == LCHAN_S_NONE) |
Harald Welte | fc0d952 | 2009-08-10 13:46:55 +0200 | [diff] [blame] | 173 | return lc; |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 174 | } |
| 175 | } |
Harald Welte | c0d83b0 | 2010-03-28 15:58:03 +0800 | [diff] [blame] | 176 | |
Harald Welte | fc0d952 | 2009-08-10 13:46:55 +0200 | [diff] [blame] | 177 | return NULL; |
| 178 | } |
| 179 | |
| 180 | static struct gsm_lchan * |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 181 | _lc_dyn_find_bts(struct gsm_bts *bts, enum gsm_phys_chan_config pchan, |
| 182 | enum gsm_phys_chan_config dyn_as_pchan) |
Harald Welte | fc0d952 | 2009-08-10 13:46:55 +0200 | [diff] [blame] | 183 | { |
| 184 | struct gsm_bts_trx *trx; |
Harald Welte | fc0d952 | 2009-08-10 13:46:55 +0200 | [diff] [blame] | 185 | struct gsm_lchan *lc; |
| 186 | |
| 187 | if (bts->chan_alloc_reverse) { |
| 188 | llist_for_each_entry_reverse(trx, &bts->trx_list, list) { |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 189 | lc = _lc_find_trx(trx, pchan, dyn_as_pchan); |
Harald Welte | fc0d952 | 2009-08-10 13:46:55 +0200 | [diff] [blame] | 190 | if (lc) |
| 191 | return lc; |
| 192 | } |
| 193 | } else { |
| 194 | llist_for_each_entry(trx, &bts->trx_list, list) { |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 195 | lc = _lc_find_trx(trx, pchan, dyn_as_pchan); |
Harald Welte | fc0d952 | 2009-08-10 13:46:55 +0200 | [diff] [blame] | 196 | if (lc) |
| 197 | return lc; |
| 198 | } |
| 199 | } |
| 200 | |
Harald Welte | f86852c | 2015-01-01 12:46:26 +0100 | [diff] [blame] | 201 | return NULL; |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 202 | } |
| 203 | |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 204 | static struct gsm_lchan * |
| 205 | _lc_find_bts(struct gsm_bts *bts, enum gsm_phys_chan_config pchan) |
| 206 | { |
| 207 | return _lc_dyn_find_bts(bts, pchan, GSM_PCHAN_NONE); |
| 208 | } |
| 209 | |
Neels Hofmeyr | a668525 | 2016-06-06 12:53:25 +0200 | [diff] [blame] | 210 | /* Allocate a logical channel. |
| 211 | * |
Neels Hofmeyr | c6926d0 | 2016-07-14 02:51:13 +0200 | [diff] [blame] | 212 | * Dynamic channel types: we always prefer a dedicated TS, and only pick + |
| 213 | * switch a dynamic TS if no pure TS of the requested PCHAN is available. |
| 214 | * |
| 215 | * TCH_F/PDCH: if we pick a PDCH ACT style dynamic TS as TCH/F channel, PDCH |
| 216 | * will be disabled in rsl_chan_activate_lchan(); there is no need to check |
| 217 | * whether PDCH mode is currently active, here. |
Neels Hofmeyr | a668525 | 2016-06-06 12:53:25 +0200 | [diff] [blame] | 218 | */ |
Holger Hans Peter Freyther | 457c2a8 | 2010-09-06 08:58:42 +0800 | [diff] [blame] | 219 | struct gsm_lchan *lchan_alloc(struct gsm_bts *bts, enum gsm_chan_t type, |
| 220 | int allow_bigger) |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 221 | { |
| 222 | struct gsm_lchan *lchan = NULL; |
Harald Welte | 30f1f37 | 2014-12-28 15:00:45 +0100 | [diff] [blame] | 223 | enum gsm_phys_chan_config first, first_cbch, second, second_cbch; |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 224 | |
| 225 | switch (type) { |
| 226 | case GSM_LCHAN_SDCCH: |
Harald Welte | 65676fe | 2009-08-10 14:44:24 +0200 | [diff] [blame] | 227 | if (bts->chan_alloc_reverse) { |
| 228 | first = GSM_PCHAN_SDCCH8_SACCH8C; |
Harald Welte | 30f1f37 | 2014-12-28 15:00:45 +0100 | [diff] [blame] | 229 | first_cbch = GSM_PCHAN_SDCCH8_SACCH8C_CBCH; |
Harald Welte | 65676fe | 2009-08-10 14:44:24 +0200 | [diff] [blame] | 230 | second = GSM_PCHAN_CCCH_SDCCH4; |
Harald Welte | 30f1f37 | 2014-12-28 15:00:45 +0100 | [diff] [blame] | 231 | second_cbch = GSM_PCHAN_CCCH_SDCCH4_CBCH; |
Harald Welte | 65676fe | 2009-08-10 14:44:24 +0200 | [diff] [blame] | 232 | } else { |
| 233 | first = GSM_PCHAN_CCCH_SDCCH4; |
Harald Welte | 30f1f37 | 2014-12-28 15:00:45 +0100 | [diff] [blame] | 234 | first_cbch = GSM_PCHAN_CCCH_SDCCH4_CBCH; |
Harald Welte | 65676fe | 2009-08-10 14:44:24 +0200 | [diff] [blame] | 235 | second = GSM_PCHAN_SDCCH8_SACCH8C; |
Harald Welte | 30f1f37 | 2014-12-28 15:00:45 +0100 | [diff] [blame] | 236 | second_cbch = GSM_PCHAN_SDCCH8_SACCH8C_CBCH; |
Harald Welte | 65676fe | 2009-08-10 14:44:24 +0200 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | lchan = _lc_find_bts(bts, first); |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 240 | if (lchan == NULL) |
Harald Welte | 30f1f37 | 2014-12-28 15:00:45 +0100 | [diff] [blame] | 241 | lchan = _lc_find_bts(bts, first_cbch); |
| 242 | if (lchan == NULL) |
Harald Welte | 65676fe | 2009-08-10 14:44:24 +0200 | [diff] [blame] | 243 | lchan = _lc_find_bts(bts, second); |
Harald Welte | 30f1f37 | 2014-12-28 15:00:45 +0100 | [diff] [blame] | 244 | if (lchan == NULL) |
| 245 | lchan = _lc_find_bts(bts, second_cbch); |
Holger Hans Peter Freyther | 457c2a8 | 2010-09-06 08:58:42 +0800 | [diff] [blame] | 246 | |
| 247 | /* allow to assign bigger channels */ |
| 248 | if (allow_bigger) { |
| 249 | if (lchan == NULL) { |
| 250 | lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_H); |
Neels Hofmeyr | f5713a5 | 2016-06-06 12:57:22 +0200 | [diff] [blame] | 251 | if (lchan) |
| 252 | type = GSM_LCHAN_TCH_H; |
Holger Hans Peter Freyther | 457c2a8 | 2010-09-06 08:58:42 +0800 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | if (lchan == NULL) { |
| 256 | lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_F); |
Neels Hofmeyr | f5713a5 | 2016-06-06 12:57:22 +0200 | [diff] [blame] | 257 | if (lchan) |
| 258 | type = GSM_LCHAN_TCH_F; |
Holger Hans Peter Freyther | 457c2a8 | 2010-09-06 08:58:42 +0800 | [diff] [blame] | 259 | } |
Neels Hofmeyr | a668525 | 2016-06-06 12:53:25 +0200 | [diff] [blame] | 260 | |
| 261 | /* try dynamic TCH/F_PDCH */ |
| 262 | if (lchan == NULL) { |
| 263 | lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_F_PDCH); |
| 264 | /* TCH/F_PDCH will be used as TCH/F */ |
| 265 | if (lchan) |
| 266 | type = GSM_LCHAN_TCH_F; |
| 267 | } |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 268 | |
| 269 | /* try fully dynamic TCH/F_TCH/H_PDCH */ |
| 270 | if (lchan == NULL) { |
| 271 | lchan = _lc_dyn_find_bts(bts, GSM_PCHAN_TCH_F_TCH_H_PDCH, |
| 272 | GSM_PCHAN_TCH_H); |
| 273 | if (lchan) |
| 274 | type = GSM_LCHAN_TCH_H; |
| 275 | } |
| 276 | /* |
| 277 | * No need to check fully dynamic channels for TCH/F: |
| 278 | * if no TCH/H was available, neither will be TCH/F. |
| 279 | */ |
Holger Hans Peter Freyther | 457c2a8 | 2010-09-06 08:58:42 +0800 | [diff] [blame] | 280 | } |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 281 | break; |
| 282 | case GSM_LCHAN_TCH_F: |
Harald Welte | fc0d952 | 2009-08-10 13:46:55 +0200 | [diff] [blame] | 283 | lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_F); |
Harald Welte | a4c63b0 | 2014-05-18 22:23:26 +0200 | [diff] [blame] | 284 | /* If we don't have TCH/F available, fall-back to TCH/H */ |
| 285 | if (!lchan) { |
| 286 | lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_H); |
Neels Hofmeyr | f5713a5 | 2016-06-06 12:57:22 +0200 | [diff] [blame] | 287 | if (lchan) |
| 288 | type = GSM_LCHAN_TCH_H; |
Harald Welte | a4c63b0 | 2014-05-18 22:23:26 +0200 | [diff] [blame] | 289 | } |
Neels Hofmeyr | a668525 | 2016-06-06 12:53:25 +0200 | [diff] [blame] | 290 | /* If we don't have TCH/H either, try dynamic TCH/F_PDCH */ |
| 291 | if (!lchan) { |
| 292 | lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_F_PDCH); |
| 293 | /* TCH/F_PDCH used as TCH/F -- here, type is already |
| 294 | * set to GSM_LCHAN_TCH_F, but for clarity's sake... */ |
| 295 | if (lchan) |
| 296 | type = GSM_LCHAN_TCH_F; |
| 297 | } |
Neels Hofmeyr | 5f0c71b | 2016-07-23 20:15:28 +0200 | [diff] [blame] | 298 | |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 299 | /* Try fully dynamic TCH/F_TCH/H_PDCH as TCH/F... */ |
Neels Hofmeyr | 5f0c71b | 2016-07-23 20:15:28 +0200 | [diff] [blame] | 300 | if (!lchan && bts->network->dyn_ts_allow_tch_f) { |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 301 | lchan = _lc_dyn_find_bts(bts, |
| 302 | GSM_PCHAN_TCH_F_TCH_H_PDCH, |
| 303 | GSM_PCHAN_TCH_F); |
| 304 | if (lchan) |
| 305 | type = GSM_LCHAN_TCH_F; |
| 306 | } |
| 307 | /* ...and as TCH/H. */ |
| 308 | if (!lchan) { |
| 309 | lchan = _lc_dyn_find_bts(bts, |
| 310 | GSM_PCHAN_TCH_F_TCH_H_PDCH, |
| 311 | GSM_PCHAN_TCH_H); |
| 312 | if (lchan) |
| 313 | type = GSM_LCHAN_TCH_H; |
| 314 | } |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 315 | break; |
| 316 | case GSM_LCHAN_TCH_H: |
Alexander Couzens | fbd96f5 | 2016-08-29 18:40:02 +0200 | [diff] [blame] | 317 | lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_H); |
Harald Welte | 210c850 | 2009-12-12 20:58:20 +0100 | [diff] [blame] | 318 | /* If we don't have TCH/H available, fall-back to TCH/F */ |
Harald Welte | 487e6be | 2009-12-12 21:16:38 +0100 | [diff] [blame] | 319 | if (!lchan) { |
Harald Welte | 210c850 | 2009-12-12 20:58:20 +0100 | [diff] [blame] | 320 | lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_F); |
Neels Hofmeyr | f5713a5 | 2016-06-06 12:57:22 +0200 | [diff] [blame] | 321 | if (lchan) |
| 322 | type = GSM_LCHAN_TCH_F; |
Harald Welte | 487e6be | 2009-12-12 21:16:38 +0100 | [diff] [blame] | 323 | } |
Neels Hofmeyr | fdd9ad7 | 2016-07-14 03:01:24 +0200 | [diff] [blame] | 324 | /* No dedicated TCH/x available -- try fully dynamic |
| 325 | * TCH/F_TCH/H_PDCH */ |
| 326 | if (!lchan) { |
| 327 | lchan = _lc_dyn_find_bts(bts, |
| 328 | GSM_PCHAN_TCH_F_TCH_H_PDCH, |
| 329 | GSM_PCHAN_TCH_H); |
| 330 | if (lchan) |
| 331 | type = GSM_LCHAN_TCH_H; |
| 332 | } |
| 333 | /* |
| 334 | * No need to check TCH/F_TCH/H_PDCH channels for TCH/F: |
| 335 | * if no TCH/H was available, neither will be TCH/F. |
| 336 | */ |
Neels Hofmeyr | a668525 | 2016-06-06 12:53:25 +0200 | [diff] [blame] | 337 | /* If we don't have TCH/F either, try dynamic TCH/F_PDCH */ |
| 338 | if (!lchan) { |
| 339 | lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_F_PDCH); |
| 340 | if (lchan) |
| 341 | type = GSM_LCHAN_TCH_F; |
| 342 | } |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 343 | break; |
| 344 | default: |
Harald Welte | b1d4c8e | 2009-12-17 23:10:46 +0100 | [diff] [blame] | 345 | LOGP(DRLL, LOGL_ERROR, "Unknown gsm_chan_t %u\n", type); |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 346 | } |
| 347 | |
Holger Freyther | c6ea9db | 2008-12-30 19:18:21 +0000 | [diff] [blame] | 348 | if (lchan) { |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 349 | lchan->type = type; |
Holger Freyther | c6ea9db | 2008-12-30 19:18:21 +0000 | [diff] [blame] | 350 | |
Neels Hofmeyr | d1c0e37 | 2016-07-25 12:33:02 +0200 | [diff] [blame] | 351 | LOGP(DRLL, LOGL_INFO, "%s Allocating lchan=%u as %s\n", |
| 352 | gsm_ts_and_pchan_name(lchan->ts), |
| 353 | lchan->nr, gsm_lchant_name(lchan->type)); |
| 354 | |
Holger Hans Peter Freyther | 5ba6f48 | 2009-10-28 14:23:39 +0100 | [diff] [blame] | 355 | /* clear sapis */ |
Holger Hans Peter Freyther | 45b0243 | 2009-11-18 22:59:51 +0100 | [diff] [blame] | 356 | memset(lchan->sapis, 0, ARRAY_SIZE(lchan->sapis)); |
Holger Hans Peter Freyther | 5ba6f48 | 2009-10-28 14:23:39 +0100 | [diff] [blame] | 357 | |
Holger Hans Peter Freyther | ea52802 | 2009-11-18 22:57:02 +0100 | [diff] [blame] | 358 | /* clear multi rate config */ |
Andreas Eversberg | 7326652 | 2014-01-19 11:47:44 +0100 | [diff] [blame] | 359 | memset(&lchan->mr_ms_lv, 0, sizeof(lchan->mr_ms_lv)); |
| 360 | memset(&lchan->mr_bts_lv, 0, sizeof(lchan->mr_bts_lv)); |
Holger Hans Peter Freyther | 454140e | 2014-12-28 12:08:28 +0100 | [diff] [blame] | 361 | lchan->broken_reason = ""; |
Harald Welte | c0d83b0 | 2010-03-28 15:58:03 +0800 | [diff] [blame] | 362 | } else { |
| 363 | struct challoc_signal_data sig; |
Neels Hofmeyr | d1c0e37 | 2016-07-25 12:33:02 +0200 | [diff] [blame] | 364 | |
| 365 | LOGP(DRLL, LOGL_ERROR, "Failed to allocate %s channel\n", |
| 366 | gsm_lchant_name(type)); |
| 367 | |
Harald Welte | c0d83b0 | 2010-03-28 15:58:03 +0800 | [diff] [blame] | 368 | sig.bts = bts; |
| 369 | sig.type = type; |
Pablo Neira Ayuso | bbc5b99 | 2011-05-06 12:12:31 +0200 | [diff] [blame] | 370 | osmo_signal_dispatch(SS_CHALLOC, S_CHALLOC_ALLOC_FAIL, &sig); |
Holger Freyther | c6ea9db | 2008-12-30 19:18:21 +0000 | [diff] [blame] | 371 | } |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 372 | |
| 373 | return lchan; |
| 374 | } |
| 375 | |
| 376 | /* Free a logical channel */ |
| 377 | void lchan_free(struct gsm_lchan *lchan) |
| 378 | { |
Harald Welte | c0d83b0 | 2010-03-28 15:58:03 +0800 | [diff] [blame] | 379 | struct challoc_signal_data sig; |
Harald Welte | d12b0fd | 2009-12-15 21:36:05 +0100 | [diff] [blame] | 380 | int i; |
| 381 | |
Harald Welte | c0d83b0 | 2010-03-28 15:58:03 +0800 | [diff] [blame] | 382 | sig.type = lchan->type; |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 383 | lchan->type = GSM_LCHAN_NONE; |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 384 | |
| 385 | |
| 386 | if (lchan->conn) { |
Holger Hans Peter Freyther | 08eebd5 | 2010-12-27 13:28:20 +0100 | [diff] [blame] | 387 | struct lchan_signal_data sig; |
| 388 | |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 389 | /* We might kill an active channel... */ |
Holger Hans Peter Freyther | 08eebd5 | 2010-12-27 13:28:20 +0100 | [diff] [blame] | 390 | sig.lchan = lchan; |
| 391 | sig.mr = NULL; |
Pablo Neira Ayuso | bbc5b99 | 2011-05-06 12:12:31 +0200 | [diff] [blame] | 392 | osmo_signal_dispatch(SS_LCHAN, S_LCHAN_UNEXPECTED_RELEASE, &sig); |
Holger Freyther | 12aa50d | 2009-01-01 18:02:05 +0000 | [diff] [blame] | 393 | } |
Holger Freyther | c6ea9db | 2008-12-30 19:18:21 +0000 | [diff] [blame] | 394 | |
Holger Hans Peter Freyther | f95f273 | 2012-01-17 15:27:33 +0100 | [diff] [blame] | 395 | if (lchan->abis_ip.rtp_socket) { |
| 396 | LOGP(DRLL, LOGL_ERROR, "%s RTP Proxy Socket remained open.\n", |
| 397 | gsm_lchan_name(lchan)); |
| 398 | rtp_socket_free(lchan->abis_ip.rtp_socket); |
| 399 | lchan->abis_ip.rtp_socket = NULL; |
| 400 | } |
Harald Welte | c627afc | 2009-01-09 21:39:17 +0000 | [diff] [blame] | 401 | |
Holger Freyther | c6ea9db | 2008-12-30 19:18:21 +0000 | [diff] [blame] | 402 | /* stop the timer */ |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 403 | osmo_timer_del(&lchan->T3101); |
Holger Freyther | c6ea9db | 2008-12-30 19:18:21 +0000 | [diff] [blame] | 404 | |
Harald Welte | d12b0fd | 2009-12-15 21:36:05 +0100 | [diff] [blame] | 405 | /* clear cached measuement reports */ |
| 406 | lchan->meas_rep_idx = 0; |
| 407 | for (i = 0; i < ARRAY_SIZE(lchan->meas_rep); i++) { |
| 408 | lchan->meas_rep[i].flags = 0; |
| 409 | lchan->meas_rep[i].nr = 0; |
| 410 | } |
Harald Welte | f7c28b0 | 2009-12-21 13:30:17 +0100 | [diff] [blame] | 411 | for (i = 0; i < ARRAY_SIZE(lchan->neigh_meas); i++) |
| 412 | lchan->neigh_meas[i].arfcn = 0; |
Harald Welte | d12b0fd | 2009-12-15 21:36:05 +0100 | [diff] [blame] | 413 | |
Holger Hans Peter Freyther | 5ba05f4 | 2010-06-22 12:11:59 +0800 | [diff] [blame] | 414 | if (lchan->rqd_ref) { |
| 415 | talloc_free(lchan->rqd_ref); |
| 416 | lchan->rqd_ref = NULL; |
| 417 | lchan->rqd_ta = 0; |
| 418 | } |
| 419 | |
Harald Welte | c0d83b0 | 2010-03-28 15:58:03 +0800 | [diff] [blame] | 420 | sig.lchan = lchan; |
| 421 | sig.bts = lchan->ts->trx->bts; |
Pablo Neira Ayuso | bbc5b99 | 2011-05-06 12:12:31 +0200 | [diff] [blame] | 422 | osmo_signal_dispatch(SS_CHALLOC, S_CHALLOC_FREED, &sig); |
Harald Welte | c0d83b0 | 2010-03-28 15:58:03 +0800 | [diff] [blame] | 423 | |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 424 | if (lchan->conn) { |
Holger Hans Peter Freyther | 4049455 | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 425 | LOGP(DRLL, LOGL_ERROR, "the subscriber connection should be gone.\n"); |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 426 | lchan->conn = NULL; |
| 427 | } |
| 428 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 429 | /* FIXME: ts_free() the timeslot, if we're the last logical |
| 430 | * channel using it */ |
| 431 | } |
Holger Freyther | c6ea9db | 2008-12-30 19:18:21 +0000 | [diff] [blame] | 432 | |
Holger Hans Peter Freyther | 135f797 | 2010-04-15 11:21:02 +0200 | [diff] [blame] | 433 | /* |
| 434 | * There was an error with the TRX and we need to forget |
| 435 | * any state so that a lchan can be allocated again after |
| 436 | * the trx is fully usable. |
Holger Hans Peter Freyther | f7a1c23 | 2010-06-22 12:19:06 +0800 | [diff] [blame] | 437 | * |
| 438 | * This should be called after lchan_free to force a channel |
| 439 | * be available for allocation again. This means that this |
| 440 | * method will stop the "delay after error"-timer and set the |
| 441 | * state to LCHAN_S_NONE. |
Holger Hans Peter Freyther | 135f797 | 2010-04-15 11:21:02 +0200 | [diff] [blame] | 442 | */ |
| 443 | void lchan_reset(struct gsm_lchan *lchan) |
| 444 | { |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 445 | osmo_timer_del(&lchan->T3101); |
Holger Hans Peter Freyther | b348939 | 2011-12-28 16:21:05 +0100 | [diff] [blame] | 446 | osmo_timer_del(&lchan->T3109); |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 447 | osmo_timer_del(&lchan->T3111); |
| 448 | osmo_timer_del(&lchan->error_timer); |
Holger Hans Peter Freyther | 135f797 | 2010-04-15 11:21:02 +0200 | [diff] [blame] | 449 | |
| 450 | lchan->type = GSM_LCHAN_NONE; |
Max | dc10ce9 | 2017-09-06 18:20:36 +0200 | [diff] [blame] | 451 | rsl_lchan_set_state(lchan, LCHAN_S_NONE); |
Holger Hans Peter Freyther | f95f273 | 2012-01-17 15:27:33 +0100 | [diff] [blame] | 452 | |
| 453 | if (lchan->abis_ip.rtp_socket) { |
| 454 | rtp_socket_free(lchan->abis_ip.rtp_socket); |
| 455 | lchan->abis_ip.rtp_socket = NULL; |
| 456 | } |
Holger Hans Peter Freyther | 135f797 | 2010-04-15 11:21:02 +0200 | [diff] [blame] | 457 | } |
| 458 | |
Holger Hans Peter Freyther | 4b85a32 | 2010-07-29 17:09:36 +0800 | [diff] [blame] | 459 | /* Drive the release process of the lchan */ |
Holger Hans Peter Freyther | 8582535 | 2011-12-27 22:24:17 +0100 | [diff] [blame] | 460 | static void _lchan_handle_release(struct gsm_lchan *lchan, |
Holger Hans Peter Freyther | b348939 | 2011-12-28 16:21:05 +0100 | [diff] [blame] | 461 | int sacch_deact, int mode) |
Holger Hans Peter Freyther | 4b85a32 | 2010-07-29 17:09:36 +0800 | [diff] [blame] | 462 | { |
Holger Hans Peter Freyther | 8582535 | 2011-12-27 22:24:17 +0100 | [diff] [blame] | 463 | /* Release all SAPIs on the local end and continue */ |
| 464 | rsl_release_sapis_from(lchan, 1, RSL_REL_LOCAL_END); |
Holger Hans Peter Freyther | 4b85a32 | 2010-07-29 17:09:36 +0800 | [diff] [blame] | 465 | |
Holger Hans Peter Freyther | 8582535 | 2011-12-27 22:24:17 +0100 | [diff] [blame] | 466 | /* |
| 467 | * Shall we send a RR Release, start T3109 and wait for the |
| 468 | * release indication from the BTS or just take it down (e.g. |
| 469 | * on assignment requests) |
| 470 | */ |
Holger Hans Peter Freyther | b348939 | 2011-12-28 16:21:05 +0100 | [diff] [blame] | 471 | if (sacch_deact) { |
Holger Hans Peter Freyther | 4b85a32 | 2010-07-29 17:09:36 +0800 | [diff] [blame] | 472 | gsm48_send_rr_release(lchan); |
Holger Hans Peter Freyther | b348939 | 2011-12-28 16:21:05 +0100 | [diff] [blame] | 473 | |
| 474 | /* Deactivate the SACCH on the BTS side */ |
| 475 | rsl_deact_sacch(lchan); |
| 476 | rsl_start_t3109(lchan); |
Holger Hans Peter Freyther | 006e3d8 | 2012-12-25 23:45:14 +0100 | [diff] [blame] | 477 | } else if (lchan->sapis[0] == LCHAN_SAPI_UNUSED) { |
| 478 | rsl_direct_rf_release(lchan); |
Holger Hans Peter Freyther | b348939 | 2011-12-28 16:21:05 +0100 | [diff] [blame] | 479 | } else { |
Holger Hans Peter Freyther | 8582535 | 2011-12-27 22:24:17 +0100 | [diff] [blame] | 480 | rsl_release_request(lchan, 0, mode); |
Holger Hans Peter Freyther | b348939 | 2011-12-28 16:21:05 +0100 | [diff] [blame] | 481 | } |
Holger Hans Peter Freyther | 4b85a32 | 2010-07-29 17:09:36 +0800 | [diff] [blame] | 482 | } |
Holger Hans Peter Freyther | 135f797 | 2010-04-15 11:21:02 +0200 | [diff] [blame] | 483 | |
Holger Freyther | 67b4b9a | 2009-01-01 03:46:11 +0000 | [diff] [blame] | 484 | /* Consider releasing the channel now */ |
Holger Hans Peter Freyther | 5ca825e | 2012-12-06 12:01:38 +0100 | [diff] [blame] | 485 | int lchan_release(struct gsm_lchan *lchan, int sacch_deact, enum rsl_rel_mode mode) |
Holger Freyther | c6ea9db | 2008-12-30 19:18:21 +0000 | [diff] [blame] | 486 | { |
Holger Hans Peter Freyther | 4b85a32 | 2010-07-29 17:09:36 +0800 | [diff] [blame] | 487 | DEBUGP(DRLL, "%s starting release sequence\n", gsm_lchan_name(lchan)); |
Holger Hans Peter Freyther | 63d18b5 | 2010-04-10 00:14:55 +0200 | [diff] [blame] | 488 | rsl_lchan_set_state(lchan, LCHAN_S_REL_REQ); |
Holger Hans Peter Freyther | 4b85a32 | 2010-07-29 17:09:36 +0800 | [diff] [blame] | 489 | |
Holger Hans Peter Freyther | abf962b | 2010-11-14 16:04:46 +0100 | [diff] [blame] | 490 | lchan->conn = NULL; |
Holger Hans Peter Freyther | 8582535 | 2011-12-27 22:24:17 +0100 | [diff] [blame] | 491 | _lchan_handle_release(lchan, sacch_deact, mode); |
Holger Freyther | 67b4b9a | 2009-01-01 03:46:11 +0000 | [diff] [blame] | 492 | return 1; |
| 493 | } |
| 494 | |
Neels Hofmeyr | 2afffd5 | 2016-09-25 17:01:20 +0200 | [diff] [blame] | 495 | void bts_chan_load(struct pchan_load *cl, const struct gsm_bts *bts) |
Harald Welte | b908cb7 | 2009-12-22 13:09:29 +0100 | [diff] [blame] | 496 | { |
| 497 | struct gsm_bts_trx *trx; |
| 498 | |
| 499 | llist_for_each_entry(trx, &bts->trx_list, list) { |
| 500 | int i; |
| 501 | |
| 502 | /* skip administratively deactivated tranxsceivers */ |
Harald Welte | d64c0bc | 2011-05-30 12:07:53 +0200 | [diff] [blame] | 503 | if (!nm_is_running(&trx->mo.nm_state) || |
| 504 | !nm_is_running(&trx->bb_transc.mo.nm_state)) |
Harald Welte | b908cb7 | 2009-12-22 13:09:29 +0100 | [diff] [blame] | 505 | continue; |
| 506 | |
| 507 | for (i = 0; i < ARRAY_SIZE(trx->ts); i++) { |
| 508 | struct gsm_bts_trx_ts *ts = &trx->ts[i]; |
| 509 | struct load_counter *pl = &cl->pchan[ts->pchan]; |
| 510 | int j; |
Neels Hofmeyr | 3673380 | 2016-07-29 18:10:59 +0200 | [diff] [blame] | 511 | int subslots; |
Harald Welte | b908cb7 | 2009-12-22 13:09:29 +0100 | [diff] [blame] | 512 | |
| 513 | /* skip administratively deactivated timeslots */ |
Harald Welte | d64c0bc | 2011-05-30 12:07:53 +0200 | [diff] [blame] | 514 | if (!nm_is_running(&ts->mo.nm_state)) |
Harald Welte | b908cb7 | 2009-12-22 13:09:29 +0100 | [diff] [blame] | 515 | continue; |
| 516 | |
Neels Hofmeyr | 3673380 | 2016-07-29 18:10:59 +0200 | [diff] [blame] | 517 | subslots = ts_subslots(ts); |
| 518 | for (j = 0; j < subslots; j++) { |
Harald Welte | b908cb7 | 2009-12-22 13:09:29 +0100 | [diff] [blame] | 519 | struct gsm_lchan *lchan = &ts->lchan[j]; |
| 520 | |
| 521 | pl->total++; |
| 522 | |
| 523 | switch (lchan->state) { |
| 524 | case LCHAN_S_NONE: |
| 525 | break; |
| 526 | default: |
| 527 | pl->used++; |
| 528 | break; |
| 529 | } |
| 530 | } |
| 531 | } |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | void network_chan_load(struct pchan_load *pl, struct gsm_network *net) |
| 536 | { |
| 537 | struct gsm_bts *bts; |
| 538 | |
| 539 | memset(pl, 0, sizeof(*pl)); |
| 540 | |
| 541 | llist_for_each_entry(bts, &net->bts_list, list) |
Neels Hofmeyr | 2afffd5 | 2016-09-25 17:01:20 +0200 | [diff] [blame] | 542 | bts_chan_load(pl, bts); |
Harald Welte | b908cb7 | 2009-12-22 13:09:29 +0100 | [diff] [blame] | 543 | } |
Neels Hofmeyr | 2afffd5 | 2016-09-25 17:01:20 +0200 | [diff] [blame] | 544 | |