Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 1 | /* gprs_rlcmac.cpp |
| 2 | * |
| 3 | * Copyright (C) 2012 Ivan Klyuchnikov |
| 4 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 5 | * Copyright (C) 2013 by Holger Hans Peter Freyther |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version 2 |
| 10 | * of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 20 | */ |
| 21 | |
| 22 | #include <gprs_rlcmac.h> |
| 23 | #include <gprs_debug.h> |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 24 | #include <bts.h> |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 25 | #include <tbf.h> |
Jacob Erlbeck | e2e004e | 2015-06-18 17:16:26 +0200 | [diff] [blame] | 26 | #include <gprs_ms.h> |
Jacob Erlbeck | 8cba7e9 | 2016-01-19 15:48:03 +0100 | [diff] [blame] | 27 | #include <pcu_utils.h> |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 28 | |
| 29 | #include <errno.h> |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 30 | #include <values.h> |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 31 | |
Max | 842d781 | 2017-11-01 18:11:24 +0100 | [diff] [blame] | 32 | extern "C" { |
| 33 | #include "mslot_class.h" |
| 34 | } |
| 35 | |
Jacob Erlbeck | 77da355 | 2015-07-16 18:33:46 +0200 | [diff] [blame] | 36 | /* Consider a PDCH as idle if has at most this number of TBFs assigned to it */ |
| 37 | #define PDCH_IDLE_TBF_THRESH 1 |
| 38 | |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 39 | static char *set_flag_chars(char *buf, uint8_t val, char set_char, char unset_char = 0) |
| 40 | { |
| 41 | int i; |
| 42 | |
| 43 | for (i = 0; i < 8; i += 1, val = val >> 1) { |
| 44 | if (val & 1) |
| 45 | buf[i] = set_char; |
| 46 | else if (unset_char) |
| 47 | buf[i] = unset_char; |
| 48 | } |
| 49 | |
| 50 | return buf; |
| 51 | } |
| 52 | |
| 53 | static bool test_and_set_bit(uint32_t *bits, size_t elem) |
| 54 | { |
| 55 | bool was_set = bits[elem/32] & (1 << (elem % 32)); |
| 56 | bits[elem/32] |= (1 << (elem % 32)); |
| 57 | |
| 58 | return was_set; |
| 59 | } |
| 60 | |
Holger Hans Peter Freyther | 6796ed2 | 2013-10-20 16:45:10 +0200 | [diff] [blame] | 61 | static inline int8_t find_free_usf(struct gprs_rlcmac_pdch *pdch) |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 62 | { |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 63 | uint8_t usf_map = 0; |
Jacob Erlbeck | 20b7ba7 | 2015-06-30 14:34:24 +0200 | [diff] [blame] | 64 | uint8_t usf; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 65 | |
Jacob Erlbeck | 20b7ba7 | 2015-06-30 14:34:24 +0200 | [diff] [blame] | 66 | usf_map = pdch->assigned_usf(); |
| 67 | if (usf_map == (1 << 7) - 1) |
| 68 | return -1; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 69 | |
| 70 | /* look for USF, don't use USF=7 */ |
| 71 | for (usf = 0; usf < 7; usf++) { |
| 72 | if (!(usf_map & (1 << usf))) |
| 73 | return usf; |
| 74 | } |
| 75 | |
| 76 | return -1; |
| 77 | } |
| 78 | |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 79 | static inline int8_t find_free_tfi(struct gprs_rlcmac_pdch *pdch, |
| 80 | enum gprs_rlcmac_tbf_direction dir) |
| 81 | { |
| 82 | uint32_t tfi_map = 0; |
| 83 | int8_t tfi; |
| 84 | |
| 85 | tfi_map = pdch->assigned_tfi(dir); |
Max | d000d80 | 2017-09-20 17:55:28 +0200 | [diff] [blame^] | 86 | if (tfi_map == NO_FREE_TFI) |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 87 | return -1; |
| 88 | |
| 89 | /* look for USF, don't use USF=7 */ |
| 90 | for (tfi = 0; tfi < 32; tfi++) { |
| 91 | if (!(tfi_map & (1 << tfi))) |
| 92 | return tfi; |
| 93 | } |
| 94 | |
| 95 | return -1; |
| 96 | } |
| 97 | |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 98 | static int find_possible_pdchs(struct gprs_rlcmac_trx *trx, |
Jacob Erlbeck | 83426b2 | 2015-06-30 09:44:05 +0200 | [diff] [blame] | 99 | size_t max_slots, |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 100 | uint8_t mask, const char *mask_reason = NULL) |
Holger Hans Peter Freyther | b0a0075 | 2013-09-29 08:18:17 +0200 | [diff] [blame] | 101 | { |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 102 | unsigned ts; |
| 103 | int valid_ts_set = 0; |
Jacob Erlbeck | 83426b2 | 2015-06-30 09:44:05 +0200 | [diff] [blame] | 104 | int8_t last_tsc = -1; /* must be signed */ |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 105 | |
| 106 | for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) { |
Holger Hans Peter Freyther | b0a0075 | 2013-09-29 08:18:17 +0200 | [diff] [blame] | 107 | struct gprs_rlcmac_pdch *pdch; |
| 108 | |
| 109 | pdch = &trx->pdch[ts]; |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 110 | if (!pdch->is_enabled()) { |
Holger Hans Peter Freyther | b0a0075 | 2013-09-29 08:18:17 +0200 | [diff] [blame] | 111 | LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, because " |
| 112 | "not enabled\n", ts); |
| 113 | continue; |
| 114 | } |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 115 | |
| 116 | if (((1 << ts) & mask) == 0) { |
| 117 | if (mask_reason) |
| 118 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 119 | "- Skipping TS %d, because %s\n", |
| 120 | ts, mask_reason); |
| 121 | continue; |
| 122 | } |
| 123 | |
Jacob Erlbeck | 83426b2 | 2015-06-30 09:44:05 +0200 | [diff] [blame] | 124 | if (max_slots > 1) { |
| 125 | /* check if TSC changes, see TS 45.002, 6.4.2 */ |
| 126 | if (last_tsc < 0) |
| 127 | last_tsc = pdch->tsc; |
| 128 | else if (last_tsc != pdch->tsc) { |
| 129 | LOGP(DRLCMAC, LOGL_ERROR, |
| 130 | "Skipping TS %d of TRX=%d, because it " |
| 131 | "has different TSC than lower TS of TRX. " |
| 132 | "In order to allow multislot, all " |
| 133 | "slots must be configured with the same " |
| 134 | "TSC!\n", ts, trx->trx_no); |
| 135 | continue; |
| 136 | } |
| 137 | } |
| 138 | |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 139 | valid_ts_set |= 1 << ts; |
Holger Hans Peter Freyther | b0a0075 | 2013-09-29 08:18:17 +0200 | [diff] [blame] | 140 | } |
| 141 | |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 142 | return valid_ts_set; |
| 143 | } |
| 144 | |
Jacob Erlbeck | c135b87 | 2015-07-09 13:44:18 +0200 | [diff] [blame] | 145 | static int compute_usage_by_num_tbfs(struct gprs_rlcmac_pdch *pdch, |
| 146 | enum gprs_rlcmac_tbf_direction dir) |
| 147 | { |
| 148 | return pdch->num_tbfs(dir); |
| 149 | } |
| 150 | |
| 151 | static int compute_usage_by_reservation(struct gprs_rlcmac_pdch *pdch, |
| 152 | enum gprs_rlcmac_tbf_direction) |
| 153 | { |
| 154 | return |
| 155 | pdch->num_reserved(GPRS_RLCMAC_DL_TBF) + |
| 156 | pdch->num_reserved(GPRS_RLCMAC_UL_TBF); |
| 157 | } |
| 158 | |
Jacob Erlbeck | 7af53e6 | 2015-07-16 15:04:07 +0200 | [diff] [blame] | 159 | static int compute_usage_for_algo_a(struct gprs_rlcmac_pdch *pdch, |
| 160 | enum gprs_rlcmac_tbf_direction dir) |
| 161 | { |
| 162 | int usage = |
| 163 | pdch->num_tbfs(GPRS_RLCMAC_DL_TBF) + |
| 164 | pdch->num_tbfs(GPRS_RLCMAC_UL_TBF) + |
| 165 | compute_usage_by_reservation(pdch, dir); |
| 166 | |
Max | d000d80 | 2017-09-20 17:55:28 +0200 | [diff] [blame^] | 167 | if (pdch->assigned_tfi(reverse(dir)) == NO_FREE_TFI) |
Jacob Erlbeck | 7af53e6 | 2015-07-16 15:04:07 +0200 | [diff] [blame] | 168 | /* No TFI in the opposite direction, avoid it */ |
| 169 | usage += 32; |
| 170 | |
| 171 | return usage; |
| 172 | |
| 173 | } |
| 174 | |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 175 | static int find_least_busy_pdch(struct gprs_rlcmac_trx *trx, |
| 176 | enum gprs_rlcmac_tbf_direction dir, |
| 177 | uint8_t mask, |
Jacob Erlbeck | c135b87 | 2015-07-09 13:44:18 +0200 | [diff] [blame] | 178 | int (*fn)(struct gprs_rlcmac_pdch *, enum gprs_rlcmac_tbf_direction dir), |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 179 | int *free_tfi = 0, int *free_usf = 0) |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 180 | { |
| 181 | unsigned ts; |
| 182 | int min_used = INT_MAX; |
| 183 | int min_ts = -1; |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 184 | int min_tfi = -1; |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 185 | int min_usf = -1; |
| 186 | |
| 187 | for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) { |
| 188 | struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; |
| 189 | int num_tbfs; |
| 190 | int usf = -1; /* must be signed */ |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 191 | int tfi = -1; |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 192 | |
| 193 | if (((1 << ts) & mask) == 0) |
| 194 | continue; |
| 195 | |
Jacob Erlbeck | c135b87 | 2015-07-09 13:44:18 +0200 | [diff] [blame] | 196 | num_tbfs = fn(pdch, dir); |
Jacob Erlbeck | efe62a7 | 2015-07-02 15:48:25 +0200 | [diff] [blame] | 197 | |
| 198 | if (num_tbfs < min_used) { |
| 199 | /* We have found a candidate */ |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 200 | /* Make sure that a TFI is available */ |
| 201 | if (free_tfi) { |
| 202 | tfi = find_free_tfi(pdch, dir); |
| 203 | if (tfi < 0) { |
| 204 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 205 | "- Skipping TS %d, because " |
| 206 | "no TFI available\n", ts); |
| 207 | continue; |
| 208 | } |
| 209 | } |
Jacob Erlbeck | efe62a7 | 2015-07-02 15:48:25 +0200 | [diff] [blame] | 210 | /* Make sure that an USF is available */ |
| 211 | if (dir == GPRS_RLCMAC_UL_TBF) { |
| 212 | usf = find_free_usf(pdch); |
| 213 | if (usf < 0) { |
| 214 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 215 | "- Skipping TS %d, because " |
| 216 | "no USF available\n", ts); |
| 217 | continue; |
| 218 | } |
| 219 | } |
| 220 | if (min_ts >= 0) |
| 221 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 222 | "- Skipping TS %d, because " |
| 223 | "num TBFs %d > %d\n", |
| 224 | min_ts, min_used, num_tbfs); |
| 225 | min_used = num_tbfs; |
| 226 | min_ts = ts; |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 227 | min_tfi = tfi; |
Jacob Erlbeck | efe62a7 | 2015-07-02 15:48:25 +0200 | [diff] [blame] | 228 | min_usf = usf; |
| 229 | } else { |
| 230 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 231 | "- Skipping TS %d, because " |
| 232 | "num TBFs %d >= %d\n", |
| 233 | ts, num_tbfs, min_used); |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | if (min_ts < 0) |
| 238 | return -1; |
| 239 | |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 240 | if (free_tfi) |
| 241 | *free_tfi = min_tfi; |
Jacob Erlbeck | efe62a7 | 2015-07-02 15:48:25 +0200 | [diff] [blame] | 242 | if (free_usf) |
| 243 | *free_usf = min_usf; |
| 244 | |
| 245 | return min_ts; |
| 246 | } |
| 247 | |
Jacob Erlbeck | ccc34e4 | 2015-06-29 13:45:05 +0200 | [diff] [blame] | 248 | static void attach_tbf_to_pdch(struct gprs_rlcmac_pdch *pdch, |
| 249 | struct gprs_rlcmac_tbf *tbf) |
| 250 | { |
| 251 | if (tbf->pdch[pdch->ts_no]) |
| 252 | tbf->pdch[pdch->ts_no]->detach_tbf(tbf); |
| 253 | |
| 254 | tbf->pdch[pdch->ts_no] = pdch; |
| 255 | pdch->attach_tbf(tbf); |
| 256 | } |
| 257 | |
Holger Hans Peter Freyther | 743bafa | 2013-09-29 07:50:50 +0200 | [diff] [blame] | 258 | static void assign_uplink_tbf_usf( |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 259 | struct gprs_rlcmac_pdch *pdch, |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 260 | struct gprs_rlcmac_ul_tbf *tbf, |
| 261 | int tfi, int8_t usf) |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 262 | { |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 263 | tbf->m_tfi = tfi; |
Daniel Willmann | 7e994e3 | 2014-08-07 15:49:21 +0200 | [diff] [blame] | 264 | tbf->m_usf[pdch->ts_no] = usf; |
Jacob Erlbeck | ccc34e4 | 2015-06-29 13:45:05 +0200 | [diff] [blame] | 265 | attach_tbf_to_pdch(pdch, tbf); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 266 | } |
| 267 | |
Holger Hans Peter Freyther | 8481a05 | 2013-09-29 08:08:28 +0200 | [diff] [blame] | 268 | static void assign_dlink_tbf( |
| 269 | struct gprs_rlcmac_pdch *pdch, |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 270 | struct gprs_rlcmac_dl_tbf *tbf, |
| 271 | int tfi) |
Holger Hans Peter Freyther | 8481a05 | 2013-09-29 08:08:28 +0200 | [diff] [blame] | 272 | { |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 273 | tbf->m_tfi = tfi; |
Jacob Erlbeck | ccc34e4 | 2015-06-29 13:45:05 +0200 | [diff] [blame] | 274 | attach_tbf_to_pdch(pdch, tbf); |
Holger Hans Peter Freyther | 8481a05 | 2013-09-29 08:08:28 +0200 | [diff] [blame] | 275 | } |
| 276 | |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 277 | static int find_trx(BTS *bts, const GprsMs *ms, int use_trx) |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 278 | { |
| 279 | unsigned trx_no; |
| 280 | unsigned ts; |
| 281 | struct gprs_rlcmac_bts *bts_data = bts->bts_data(); |
| 282 | |
| 283 | /* We must use the TRX currently actively used by an MS */ |
| 284 | if (ms && ms->current_trx()) |
| 285 | return ms->current_trx()->trx_no; |
| 286 | |
| 287 | if (use_trx >= 0 && use_trx < 8) |
| 288 | return use_trx; |
| 289 | |
| 290 | /* Find the first TRX that has a PDCH with a free UL and DL TFI */ |
| 291 | for (trx_no = 0; trx_no < ARRAY_SIZE(bts_data->trx); trx_no += 1) { |
| 292 | struct gprs_rlcmac_trx *trx = &bts_data->trx[trx_no]; |
| 293 | for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) { |
| 294 | struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; |
| 295 | if (!pdch->is_enabled()) |
| 296 | continue; |
| 297 | |
Max | d000d80 | 2017-09-20 17:55:28 +0200 | [diff] [blame^] | 298 | if (pdch->assigned_tfi(GPRS_RLCMAC_UL_TBF) == NO_FREE_TFI) |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 299 | continue; |
| 300 | |
Max | d000d80 | 2017-09-20 17:55:28 +0200 | [diff] [blame^] | 301 | if (pdch->assigned_tfi(GPRS_RLCMAC_DL_TBF) == NO_FREE_TFI) |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 302 | continue; |
| 303 | |
| 304 | return trx_no; |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | return -EBUSY; |
| 309 | } |
| 310 | |
Jacob Erlbeck | 77da355 | 2015-07-16 18:33:46 +0200 | [diff] [blame] | 311 | static struct gprs_rlcmac_pdch * find_idle_pdch(BTS *bts) |
| 312 | { |
| 313 | unsigned trx_no; |
| 314 | unsigned ts; |
| 315 | struct gprs_rlcmac_bts *bts_data = bts->bts_data(); |
| 316 | |
| 317 | /* Find the first PDCH with an unused DL TS */ |
| 318 | for (trx_no = 0; trx_no < ARRAY_SIZE(bts_data->trx); trx_no += 1) { |
| 319 | struct gprs_rlcmac_trx *trx = &bts_data->trx[trx_no]; |
| 320 | for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) { |
| 321 | struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; |
| 322 | if (!pdch->is_enabled()) |
| 323 | continue; |
| 324 | |
| 325 | if (pdch->num_tbfs(GPRS_RLCMAC_DL_TBF) > PDCH_IDLE_TBF_THRESH) |
| 326 | continue; |
| 327 | |
| 328 | return pdch; |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | return NULL; |
| 333 | } |
| 334 | |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 335 | static int tfi_find_free(BTS *bts, const GprsMs *ms, |
| 336 | enum gprs_rlcmac_tbf_direction dir, int use_trx, int *trx_no_) |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 337 | { |
| 338 | int tfi; |
| 339 | uint8_t trx_no; |
| 340 | |
| 341 | if (use_trx == -1 && ms->current_trx()) |
| 342 | use_trx = ms->current_trx()->trx_no; |
| 343 | |
| 344 | tfi = bts->tfi_find_free(dir, &trx_no, use_trx); |
| 345 | if (tfi < 0) |
| 346 | return -EBUSY; |
| 347 | |
| 348 | if (trx_no_) |
| 349 | *trx_no_ = trx_no; |
| 350 | |
| 351 | return tfi; |
| 352 | } |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 353 | |
Max | e9fe0e3 | 2017-09-28 15:56:05 +0200 | [diff] [blame] | 354 | /*! Slot Allocation: Algorithm A |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 355 | * |
| 356 | * Assign single slot for uplink and downlink |
Max | e9fe0e3 | 2017-09-28 15:56:05 +0200 | [diff] [blame] | 357 | * |
| 358 | * \param[in,out] bts Pointer to BTS struct |
| 359 | * \param[in,out] ms_ Pointer to MS object |
| 360 | * \param[in,out] tbf_ Pointer to TBF struct |
| 361 | * \param[in] single flag indicating if we should force single-slot allocation |
| 362 | * \param[in] use_trx which TRX to use or -1 if it should be selected during allocation |
| 363 | * \returns negative error code or 0 on success |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 364 | */ |
Max | e9fe0e3 | 2017-09-28 15:56:05 +0200 | [diff] [blame] | 365 | int alloc_algorithm_a(struct gprs_rlcmac_bts *bts, GprsMs *ms_, struct gprs_rlcmac_tbf *tbf_, bool single, |
| 366 | int8_t use_trx) |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 367 | { |
| 368 | struct gprs_rlcmac_pdch *pdch; |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 369 | int ts = -1; |
Jacob Erlbeck | 5cd496d | 2015-06-30 10:24:37 +0200 | [diff] [blame] | 370 | uint8_t ul_slots, dl_slots; |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 371 | int trx_no; |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 372 | int tfi = -1; |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 373 | int usf = -1; |
| 374 | int mask = 0xff; |
| 375 | const char *mask_reason = NULL; |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 376 | const GprsMs *ms = ms_; |
| 377 | const gprs_rlcmac_tbf *tbf = tbf_; |
| 378 | gprs_rlcmac_trx *trx = ms->current_trx(); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 379 | |
| 380 | LOGP(DRLCMAC, LOGL_DEBUG, "Slot Allocation (Algorithm A) for class " |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 381 | "%d\n", tbf->ms_class()); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 382 | |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 383 | trx_no = find_trx(bts->bts, ms, use_trx); |
| 384 | if (trx_no < 0) { |
| 385 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 386 | "- Failed to find a usable TRX (TFI exhausted)\n"); |
| 387 | return trx_no; |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 388 | } |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 389 | if (!trx) |
| 390 | trx = &bts->trx[trx_no]; |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 391 | |
Jacob Erlbeck | 5cd496d | 2015-06-30 10:24:37 +0200 | [diff] [blame] | 392 | dl_slots = ms->reserved_dl_slots(); |
| 393 | ul_slots = ms->reserved_ul_slots(); |
| 394 | |
| 395 | ts = ms->first_common_ts(); |
| 396 | |
| 397 | if (ts >= 0) { |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 398 | mask_reason = "need to reuse TS"; |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 399 | mask = 1 << ts; |
Jacob Erlbeck | 5cd496d | 2015-06-30 10:24:37 +0200 | [diff] [blame] | 400 | } else if (dl_slots || ul_slots) { |
| 401 | mask_reason = "need to use a reserved common TS"; |
| 402 | mask = dl_slots & ul_slots; |
| 403 | } |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 404 | |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 405 | mask = find_possible_pdchs(trx, 1, mask, mask_reason); |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 406 | if (!mask) |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 407 | return -EINVAL; |
| 408 | |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 409 | ts = find_least_busy_pdch(trx, tbf->direction, mask, |
Jacob Erlbeck | 7af53e6 | 2015-07-16 15:04:07 +0200 | [diff] [blame] | 410 | compute_usage_for_algo_a, |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 411 | &tfi, &usf); |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 412 | |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 413 | if (tbf->direction == GPRS_RLCMAC_UL_TBF && usf < 0) { |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 414 | LOGP(DRLCMAC, LOGL_NOTICE, "- Failed " |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 415 | "to allocate a TS, no USF available\n"); |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 416 | return -EBUSY; |
| 417 | } |
| 418 | |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 419 | if (ts < 0) { |
| 420 | LOGP(DRLCMAC, LOGL_NOTICE, "- Failed " |
| 421 | "to allocate a TS, no TFI available\n"); |
| 422 | return -EBUSY; |
| 423 | } |
| 424 | |
| 425 | pdch = &trx->pdch[ts]; |
| 426 | |
| 427 | /* The allocation will be successful, so the system state and tbf_/ms_ |
| 428 | * may be modified from now on. */ |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 429 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
Jacob Erlbeck | aa9daa1 | 2015-12-28 18:49:12 +0100 | [diff] [blame] | 430 | struct gprs_rlcmac_ul_tbf *ul_tbf = as_ul_tbf(tbf_); |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 431 | LOGP(DRLCMAC, LOGL_DEBUG, "- Assign uplink TS=%d TFI=%d USF=%d\n", |
| 432 | ts, tfi, usf); |
| 433 | assign_uplink_tbf_usf(pdch, ul_tbf, tfi, usf); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 434 | } else { |
Jacob Erlbeck | aa9daa1 | 2015-12-28 18:49:12 +0100 | [diff] [blame] | 435 | struct gprs_rlcmac_dl_tbf *dl_tbf = as_dl_tbf(tbf_); |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 436 | LOGP(DRLCMAC, LOGL_DEBUG, "- Assign downlink TS=%d TFI=%d\n", |
| 437 | ts, tfi); |
| 438 | assign_dlink_tbf(pdch, dl_tbf, tfi); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 439 | } |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 440 | |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 441 | tbf_->trx = trx; |
| 442 | /* the only one TS is the common TS */ |
| 443 | tbf_->first_ts = tbf_->first_common_ts = ts; |
| 444 | ms_->set_reserved_slots(trx, 1 << ts, 1 << ts); |
| 445 | |
| 446 | tbf_->upgrade_to_multislot = 0; |
Jacob Erlbeck | 5979fe9 | 2015-07-14 14:02:41 +0200 | [diff] [blame] | 447 | bts->bts->tbf_alloc_algo_a(); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 448 | return 0; |
| 449 | } |
| 450 | |
Max | 46fbfce | 2017-11-01 19:22:25 +0100 | [diff] [blame] | 451 | int find_multi_slots(struct gprs_rlcmac_trx *trx, uint8_t mslot_class, uint8_t *ul_slots, uint8_t *dl_slots) |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 452 | { |
Holger Hans Peter Freyther | 882fc9b | 2013-12-25 20:34:26 +0100 | [diff] [blame] | 453 | uint8_t Tx, Sum; /* Maximum Number of Slots: RX, Tx, Sum Rx+Tx */ |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 454 | uint8_t Tta, Ttb, Tra, Trb; /* Minimum Number of Slots */ |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 455 | uint8_t Type; /* Type of Mobile */ |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 456 | int rx_window, tx_window, pdch_slots; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 457 | static const char *digit[10] = { "0","1","2","3","4","5","6","7","8","9" }; |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 458 | char slot_info[9] = {0}; |
| 459 | int max_capacity; |
| 460 | uint8_t max_ul_slots; |
| 461 | uint8_t max_dl_slots; |
| 462 | unsigned max_slots; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 463 | |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 464 | unsigned ul_ts, dl_ts; |
| 465 | unsigned num_tx; |
Jacob Erlbeck | 5e46a20 | 2015-07-09 11:48:23 +0200 | [diff] [blame] | 466 | enum {MASK_TT, MASK_TR}; |
| 467 | unsigned mask_sel; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 468 | |
Max | 842d781 | 2017-11-01 18:11:24 +0100 | [diff] [blame] | 469 | if (mslot_class) |
| 470 | LOGP(DRLCMAC, LOGL_DEBUG, "Slot Allocation (Algorithm B) for class %d\n", |
| 471 | mslot_class); |
| 472 | |
| 473 | Tx = mslot_class_get_tx(mslot_class); |
| 474 | Sum = mslot_class_get_sum(mslot_class); |
| 475 | Tta = mslot_class_get_ta(mslot_class); |
| 476 | Ttb = mslot_class_get_tb(mslot_class); |
Max | 01bd0cc | 2018-01-23 20:58:49 +0100 | [diff] [blame] | 477 | |
| 478 | /* FIXME: use actual TA offset for computation - make sure to adjust "1 + MS_TO" accordingly |
| 479 | see also "Offset required" bit in 3GPP TS 24.008 §10.5.1.7 */ |
| 480 | Tra = mslot_class_get_ra(mslot_class, 0); |
| 481 | Trb = mslot_class_get_rb(mslot_class, 0); |
| 482 | |
Max | 842d781 | 2017-11-01 18:11:24 +0100 | [diff] [blame] | 483 | Type = mslot_class_get_type(mslot_class); |
| 484 | |
| 485 | if (Tx == MS_NA) { |
| 486 | LOGP(DRLCMAC, LOGL_NOTICE, "Multislot class %d not applicable.\n", |
| 487 | mslot_class); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 488 | return -EINVAL; |
| 489 | } |
| 490 | |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 491 | LOGP(DRLCMAC, LOGL_DEBUG, "- Rx=%d Tx=%d Sum Rx+Tx=%s Tta=%s Ttb=%d " |
Max | 842d781 | 2017-11-01 18:11:24 +0100 | [diff] [blame] | 492 | " Tra=%d Trb=%d Type=%d\n", mslot_class_get_rx(mslot_class), Tx, |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 493 | (Sum == MS_NA) ? "N/A" : digit[Sum], |
| 494 | (Tta == MS_NA) ? "N/A" : digit[Tta], Ttb, Tra, Trb, Type); |
| 495 | |
Max | 842d781 | 2017-11-01 18:11:24 +0100 | [diff] [blame] | 496 | max_slots = OSMO_MAX(mslot_class_get_rx(mslot_class), Tx); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 497 | |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 498 | if (*dl_slots == 0) |
| 499 | *dl_slots = 0xff; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 500 | |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 501 | if (*ul_slots == 0) |
| 502 | *ul_slots = 0xff; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 503 | |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 504 | pdch_slots = find_possible_pdchs(trx, max_slots, 0xff); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 505 | |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 506 | *dl_slots &= pdch_slots; |
| 507 | *ul_slots &= pdch_slots; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 508 | |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 509 | LOGP(DRLCMAC, LOGL_DEBUG, "- Possible DL/UL slots: (TS=0)\"%s\"(TS=7)\n", |
| 510 | set_flag_chars(set_flag_chars(set_flag_chars(slot_info, |
| 511 | *dl_slots, 'D', '.'), |
| 512 | *ul_slots, 'U'), |
| 513 | *ul_slots & *dl_slots, 'C')); |
| 514 | |
| 515 | /* Check for each UL (TX) slot */ |
| 516 | |
| 517 | max_capacity = -1; |
| 518 | max_ul_slots = 0; |
| 519 | max_dl_slots = 0; |
| 520 | |
| 521 | /* Iterate through possible numbers of TX slots */ |
Max | 842d781 | 2017-11-01 18:11:24 +0100 | [diff] [blame] | 522 | for (num_tx = 1; num_tx <= mslot_class_get_tx(mslot_class); num_tx += 1) { |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 523 | uint16_t tx_valid_win = (1 << num_tx) - 1; |
| 524 | |
Jacob Erlbeck | 5e46a20 | 2015-07-09 11:48:23 +0200 | [diff] [blame] | 525 | uint8_t rx_mask[MASK_TR+1]; |
Max | 842d781 | 2017-11-01 18:11:24 +0100 | [diff] [blame] | 526 | if (Type == 1) { |
Jacob Erlbeck | dd08ac8 | 2015-07-09 12:06:56 +0200 | [diff] [blame] | 527 | rx_mask[MASK_TT] = (0x100 >> OSMO_MAX(Ttb, Tta)) - 1; |
| 528 | rx_mask[MASK_TT] &= ~((1 << (Trb + num_tx)) - 1); |
| 529 | rx_mask[MASK_TR] = (0x100 >> Ttb) - 1; |
| 530 | rx_mask[MASK_TR] &= |
| 531 | ~((1 << (OSMO_MAX(Trb, Tra) + num_tx)) - 1); |
| 532 | } else { |
| 533 | /* Class type 2 MS have independant RX and TX */ |
| 534 | rx_mask[MASK_TT] = 0xff; |
| 535 | rx_mask[MASK_TR] = 0xff; |
| 536 | } |
| 537 | |
Jacob Erlbeck | 5e46a20 | 2015-07-09 11:48:23 +0200 | [diff] [blame] | 538 | rx_mask[MASK_TT] = (rx_mask[MASK_TT] << 3) | (rx_mask[MASK_TT] >> 5); |
Jacob Erlbeck | 5e46a20 | 2015-07-09 11:48:23 +0200 | [diff] [blame] | 539 | rx_mask[MASK_TR] = (rx_mask[MASK_TR] << 3) | (rx_mask[MASK_TR] >> 5); |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 540 | |
| 541 | /* Rotate group of TX slots: UUU-----, -UUU----, ..., UU-----U */ |
| 542 | for (ul_ts = 0; ul_ts < 8; ul_ts += 1, tx_valid_win <<= 1) { |
| 543 | unsigned tx_slot_count; |
| 544 | int max_rx; |
| 545 | uint16_t rx_valid_win; |
| 546 | uint32_t checked_rx[256/32] = {0}; |
| 547 | |
| 548 | /* Wrap valid window */ |
| 549 | tx_valid_win = (tx_valid_win | tx_valid_win >> 8) & 0xff; |
| 550 | |
| 551 | tx_window = tx_valid_win; |
| 552 | |
| 553 | /* Filter out unavailable slots */ |
| 554 | tx_window &= *ul_slots; |
| 555 | |
Jacob Erlbeck | e21b79c | 2015-07-16 11:48:43 +0200 | [diff] [blame] | 556 | /* Skip if the the first TS (ul_ts) is not in the set */ |
| 557 | if ((tx_window & (1 << ul_ts)) == 0) |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 558 | continue; |
| 559 | |
Jacob Erlbeck | e21b79c | 2015-07-16 11:48:43 +0200 | [diff] [blame] | 560 | /* Skip if the the last TS (ul_ts+num_tx-1) is not in the set */ |
| 561 | if ((tx_window & (1 << ((ul_ts+num_tx-1) % 8))) == 0) |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 562 | continue; |
| 563 | |
Jacob Erlbeck | 8cba7e9 | 2016-01-19 15:48:03 +0100 | [diff] [blame] | 564 | tx_slot_count = pcu_bitcount(tx_window); |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 565 | |
Max | 842d781 | 2017-11-01 18:11:24 +0100 | [diff] [blame] | 566 | max_rx = OSMO_MIN(mslot_class_get_rx(mslot_class), Sum - num_tx); |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 567 | rx_valid_win = (1 << max_rx) - 1; |
| 568 | |
| 569 | /* Rotate group of RX slots: DDD-----, -DDD----, ..., DD-----D */ |
| 570 | for (dl_ts = 0; dl_ts < 8; dl_ts += 1, rx_valid_win <<= 1) { |
| 571 | /* Wrap valid window */ |
| 572 | rx_valid_win = (rx_valid_win | rx_valid_win >> 8) & 0xff; |
| 573 | |
| 574 | /* Validate with both Tta/Ttb/Trb and Ttb/Tra/Trb */ |
Jacob Erlbeck | 5e46a20 | 2015-07-09 11:48:23 +0200 | [diff] [blame] | 575 | for (mask_sel = MASK_TT; mask_sel <= MASK_TR; mask_sel += 1) { |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 576 | unsigned common_slot_count; |
| 577 | unsigned req_common_slots; |
| 578 | unsigned rx_slot_count; |
| 579 | uint16_t rx_bad; |
| 580 | uint8_t rx_good; |
| 581 | unsigned ts; |
| 582 | int capacity; |
| 583 | |
| 584 | /* Filter out bad slots */ |
Jacob Erlbeck | 5e46a20 | 2015-07-09 11:48:23 +0200 | [diff] [blame] | 585 | rx_bad = (uint16_t)(0xff & ~rx_mask[mask_sel]) << ul_ts; |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 586 | rx_bad = (rx_bad | (rx_bad >> 8)) & 0xff; |
| 587 | rx_good = *dl_slots & ~rx_bad; |
| 588 | |
| 589 | /* TODO: CHECK this calculation -> separate function for unit |
| 590 | * testing */ |
| 591 | |
| 592 | rx_window = rx_good & rx_valid_win; |
Jacob Erlbeck | 8cba7e9 | 2016-01-19 15:48:03 +0100 | [diff] [blame] | 593 | rx_slot_count = pcu_bitcount(rx_window); |
Jacob Erlbeck | bae33a7 | 2015-07-06 14:55:13 +0200 | [diff] [blame] | 594 | |
| 595 | #if 0 |
| 596 | LOGP(DRLCMAC, LOGL_DEBUG, "n_tx=%d, n_rx=%d, mask_sel=%d, " |
| 597 | "tx=%02x, rx=%02x, mask=%02x, bad=%02x, good=%02x, " |
| 598 | "ul=%02x, dl=%02x\n", |
| 599 | tx_slot_count, rx_slot_count, mask_sel, |
| 600 | tx_window, rx_window, rx_mask[mask_sel], rx_bad, rx_good, |
| 601 | *ul_slots, *dl_slots); |
| 602 | #endif |
| 603 | |
| 604 | /* Check compliance with TS 45.002, table 6.4.2.2.1 */ |
| 605 | /* Whether to skip this round doesn not only depend on the bit |
| 606 | * sets but also on mask_sel. Therefore this check must be done |
| 607 | * before doing the test_and_set_bit shortcut. */ |
Max | 842d781 | 2017-11-01 18:11:24 +0100 | [diff] [blame] | 608 | if (Type == 1) { |
Jacob Erlbeck | bae33a7 | 2015-07-06 14:55:13 +0200 | [diff] [blame] | 609 | unsigned slot_sum = rx_slot_count + tx_slot_count; |
| 610 | /* Assume down+up/dynamic. |
| 611 | * TODO: For ext-dynamic, down only, up only add more |
| 612 | * cases. |
| 613 | */ |
| 614 | if (slot_sum <= 6 && tx_slot_count < 3) { |
| 615 | if (mask_sel != MASK_TR) |
| 616 | /* Skip Tta */ |
| 617 | continue; |
| 618 | } else if (slot_sum > 6 && tx_slot_count < 3) { |
| 619 | if (mask_sel != MASK_TT) |
| 620 | /* Skip Tra */ |
| 621 | continue; |
| 622 | } else { |
| 623 | /* No supported row in table 6.4.2.2.1. */ |
| 624 | #ifdef ENABLE_TS_ALLOC_DEBUG |
| 625 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 626 | "- Skipping DL/UL slots: (TS=0)\"%s\"(TS=7), " |
| 627 | "combination not supported\n", |
| 628 | set_flag_chars(set_flag_chars(set_flag_chars( |
| 629 | slot_info, |
| 630 | rx_bad, 'x', '.'), |
| 631 | rx_window, 'D'), |
| 632 | tx_window, 'U')); |
| 633 | #endif |
| 634 | continue; |
| 635 | } |
| 636 | } |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 637 | |
| 638 | /* Avoid repeated RX combination check */ |
| 639 | if (test_and_set_bit(checked_rx, rx_window)) |
| 640 | continue; |
| 641 | |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 642 | if (!rx_good) { |
Jacob Erlbeck | 1653f83 | 2015-06-30 14:48:13 +0200 | [diff] [blame] | 643 | #ifdef ENABLE_TS_ALLOC_DEBUG |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 644 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 645 | "- Skipping DL/UL slots: (TS=0)\"%s\"(TS=7), " |
| 646 | "no DL slots available\n", |
| 647 | set_flag_chars(set_flag_chars(slot_info, |
| 648 | rx_bad, 'x', '.'), |
| 649 | tx_window, 'U')); |
Jacob Erlbeck | 1653f83 | 2015-06-30 14:48:13 +0200 | [diff] [blame] | 650 | #endif |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 651 | continue; |
| 652 | } |
| 653 | |
| 654 | if (!rx_window) |
| 655 | continue; |
| 656 | |
| 657 | /* Check number of common slots according to TS 54.002, 6.4.2.2 */ |
Jacob Erlbeck | 8cba7e9 | 2016-01-19 15:48:03 +0100 | [diff] [blame] | 658 | common_slot_count = pcu_bitcount(tx_window & rx_window); |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 659 | req_common_slots = OSMO_MIN(tx_slot_count, rx_slot_count); |
Max | 842d781 | 2017-11-01 18:11:24 +0100 | [diff] [blame] | 660 | if (Type == 1) |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 661 | req_common_slots = OSMO_MIN(req_common_slots, 2); |
| 662 | |
| 663 | if (req_common_slots != common_slot_count) { |
Jacob Erlbeck | 1653f83 | 2015-06-30 14:48:13 +0200 | [diff] [blame] | 664 | #ifdef ENABLE_TS_ALLOC_DEBUG |
| 665 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 666 | "- Skipping DL/UL slots: (TS=0)\"%s\"(TS=7), " |
| 667 | "invalid number of common TS: %d (expected %d)\n", |
| 668 | set_flag_chars(set_flag_chars(set_flag_chars( |
| 669 | slot_info, |
| 670 | rx_bad, 'x', '.'), |
| 671 | rx_window, 'D'), |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 672 | tx_window, 'U'), |
Jacob Erlbeck | 1653f83 | 2015-06-30 14:48:13 +0200 | [diff] [blame] | 673 | common_slot_count, |
| 674 | req_common_slots); |
| 675 | #endif |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 676 | continue; |
| 677 | } |
| 678 | |
| 679 | /* Compute capacity */ |
| 680 | capacity = 0; |
| 681 | |
| 682 | for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) { |
| 683 | int c; |
| 684 | struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; |
| 685 | if (rx_window & (1 << ts)) { |
| 686 | c = 32 - pdch->num_reserved(GPRS_RLCMAC_DL_TBF); |
Jacob Erlbeck | 9ae2823 | 2015-07-01 12:27:30 +0200 | [diff] [blame] | 687 | c = OSMO_MAX(c, 1); |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 688 | capacity += c; |
| 689 | } |
Jacob Erlbeck | ed46afd | 2015-07-01 12:19:40 +0200 | [diff] [blame] | 690 | /* Only consider common slots for UL */ |
| 691 | if (tx_window & rx_window & (1 << ts)) { |
Jacob Erlbeck | 16c6ecc | 2015-06-30 13:40:18 +0200 | [diff] [blame] | 692 | if (find_free_usf(pdch) >= 0) { |
| 693 | c = 32 - pdch->num_reserved(GPRS_RLCMAC_UL_TBF); |
| 694 | c = OSMO_MAX(c, 1); |
| 695 | capacity += c; |
| 696 | } |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 697 | } |
| 698 | } |
| 699 | |
Jacob Erlbeck | 1653f83 | 2015-06-30 14:48:13 +0200 | [diff] [blame] | 700 | #ifdef ENABLE_TS_ALLOC_DEBUG |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 701 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 702 | "- Considering DL/UL slots: (TS=0)\"%s\"(TS=7), " |
| 703 | "capacity = %d\n", |
| 704 | set_flag_chars(set_flag_chars(set_flag_chars(set_flag_chars( |
| 705 | slot_info, |
| 706 | rx_bad, 'x', '.'), |
| 707 | rx_window, 'D'), |
| 708 | tx_window, 'U'), |
| 709 | rx_window & tx_window, 'C'), |
| 710 | capacity); |
Jacob Erlbeck | 1653f83 | 2015-06-30 14:48:13 +0200 | [diff] [blame] | 711 | #endif |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 712 | |
| 713 | if (capacity <= max_capacity) |
| 714 | continue; |
| 715 | |
| 716 | max_capacity = capacity; |
| 717 | max_ul_slots = tx_window; |
| 718 | max_dl_slots = rx_window; |
| 719 | }}}} |
| 720 | |
| 721 | if (!max_ul_slots || !max_dl_slots) { |
| 722 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 723 | "No valid UL/DL slot combination found\n"); |
| 724 | return -EINVAL; |
| 725 | } |
| 726 | |
| 727 | *ul_slots = max_ul_slots; |
| 728 | *dl_slots = max_dl_slots; |
| 729 | |
| 730 | return 0; |
| 731 | } |
| 732 | |
Max | e9fe0e3 | 2017-09-28 15:56:05 +0200 | [diff] [blame] | 733 | /*! Slot Allocation: Algorithm B |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 734 | * |
| 735 | * Assign as many downlink slots as possible. |
| 736 | * Assign one uplink slot. (With free USF) |
| 737 | * |
Max | e9fe0e3 | 2017-09-28 15:56:05 +0200 | [diff] [blame] | 738 | * \param[in,out] bts Pointer to BTS struct |
| 739 | * \param[in,out] ms_ Pointer to MS object |
| 740 | * \param[in,out] tbf_ Pointer to TBF struct |
| 741 | * \param[in] single flag indicating if we should force single-slot allocation |
| 742 | * \param[in] use_trx which TRX to use or -1 if it should be selected during allocation |
| 743 | * \returns negative error code or 0 on success |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 744 | */ |
Max | e9fe0e3 | 2017-09-28 15:56:05 +0200 | [diff] [blame] | 745 | int alloc_algorithm_b(struct gprs_rlcmac_bts *bts, GprsMs *ms_, struct gprs_rlcmac_tbf *tbf_, bool single, |
| 746 | int8_t use_trx) |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 747 | { |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 748 | uint8_t dl_slots; |
| 749 | uint8_t ul_slots; |
| 750 | uint8_t reserved_dl_slots; |
| 751 | uint8_t reserved_ul_slots; |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 752 | int8_t first_common_ts; |
| 753 | uint8_t slotcount = 0; |
| 754 | uint8_t avail_count = 0; |
| 755 | char slot_info[9] = {0}; |
| 756 | int ts; |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 757 | int first_ts = -1; |
| 758 | int usf[8] = {-1, -1, -1, -1, -1, -1, -1, -1}; |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 759 | int rc; |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 760 | int tfi; |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 761 | int trx_no; |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 762 | const GprsMs *ms = ms_; |
| 763 | const gprs_rlcmac_tbf *tbf = tbf_; |
| 764 | gprs_rlcmac_trx *trx; |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 765 | |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 766 | /* Step 1: Get current state from the MS object */ |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 767 | |
| 768 | if (!ms) { |
| 769 | LOGP(DRLCMAC, LOGL_ERROR, "MS not set\n"); |
| 770 | return -EINVAL; |
| 771 | } |
| 772 | |
Max | 92e9c17 | 2017-09-28 16:25:25 +0200 | [diff] [blame] | 773 | dl_slots = ms->reserved_dl_slots(); |
| 774 | ul_slots = ms->reserved_ul_slots(); |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 775 | first_common_ts = ms->first_common_ts(); |
| 776 | trx = ms->current_trx(); |
| 777 | |
| 778 | if (trx) { |
| 779 | if (use_trx >= 0 && use_trx != trx->trx_no) { |
| 780 | LOGP(DRLCMAC, LOGL_ERROR, |
| 781 | "- Requested incompatible TRX %d (current is %d)\n", |
| 782 | use_trx, trx->trx_no); |
| 783 | return -EINVAL; |
| 784 | } |
| 785 | use_trx = trx->trx_no; |
| 786 | } |
| 787 | |
| 788 | /* Step 2a: Find usable TRX and TFI */ |
| 789 | tfi = tfi_find_free(bts->bts, ms, tbf->direction, use_trx, &trx_no); |
| 790 | if (tfi < 0) { |
| 791 | LOGP(DRLCMAC, LOGL_NOTICE, "- Failed to allocate a TFI\n"); |
| 792 | return tfi; |
| 793 | } |
| 794 | |
| 795 | /* Step 2b: Reserve slots on the TRX for the MS */ |
| 796 | if (!trx) |
| 797 | trx = &bts->trx[trx_no]; |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 798 | |
| 799 | if (!dl_slots || !ul_slots) { |
Max | 842d781 | 2017-11-01 18:11:24 +0100 | [diff] [blame] | 800 | rc = find_multi_slots(trx, ms->ms_class(), &ul_slots, &dl_slots); |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 801 | if (rc < 0) |
| 802 | return rc; |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 803 | } |
| 804 | |
Max | 92e9c17 | 2017-09-28 16:25:25 +0200 | [diff] [blame] | 805 | reserved_dl_slots = dl_slots; |
| 806 | reserved_ul_slots = ul_slots; |
| 807 | |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 808 | /* Step 3: Derive the slot set for the current TBF */ |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 809 | if (single) { |
| 810 | /* Make sure to consider the first common slot only */ |
| 811 | ul_slots = dl_slots = dl_slots & ul_slots; |
| 812 | |
| 813 | ts = first_common_ts; |
| 814 | |
| 815 | if (ts < 0) |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 816 | ts = find_least_busy_pdch(trx, tbf->direction, |
Jacob Erlbeck | c135b87 | 2015-07-09 13:44:18 +0200 | [diff] [blame] | 817 | dl_slots & ul_slots, compute_usage_by_num_tbfs, |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 818 | NULL, NULL); |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 819 | if (ts < 0) |
Jacob Erlbeck | 8cba7e9 | 2016-01-19 15:48:03 +0100 | [diff] [blame] | 820 | ul_slots = dl_slots = pcu_lsb(dl_slots & ul_slots); |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 821 | else |
| 822 | ul_slots = dl_slots = (dl_slots & ul_slots) & (1<<ts); |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 823 | } |
| 824 | |
| 825 | if (dl_slots == 0) { |
| 826 | LOGP(DRLCMAC, LOGL_NOTICE, "No downlink slots available\n"); |
| 827 | return -EINVAL; |
| 828 | } |
| 829 | |
| 830 | if (ul_slots == 0) { |
| 831 | LOGP(DRLCMAC, LOGL_NOTICE, "No uplink slots available\n"); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 832 | return -EINVAL; |
| 833 | } |
| 834 | |
| 835 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) { |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 836 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 837 | "- Selected DL slots: (TS=0)\"%s\"(TS=7)%s\n", |
| 838 | set_flag_chars(set_flag_chars(slot_info, |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 839 | reserved_dl_slots, 'd', '.'), |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 840 | dl_slots, 'D'), |
| 841 | single ? ", single" : ""); |
| 842 | |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 843 | /* assign downlink */ |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 844 | if (dl_slots == 0) { |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 845 | LOGP(DRLCMAC, LOGL_NOTICE, "No downlink slots " |
| 846 | "available\n"); |
| 847 | return -EINVAL; |
| 848 | } |
Jacob Erlbeck | 8cba7e9 | 2016-01-19 15:48:03 +0100 | [diff] [blame] | 849 | slotcount = pcu_bitcount(dl_slots); |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 850 | first_ts = ffs(dl_slots) - 1; |
Jacob Erlbeck | 8cba7e9 | 2016-01-19 15:48:03 +0100 | [diff] [blame] | 851 | avail_count = pcu_bitcount(reserved_dl_slots); |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 852 | |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 853 | } else { |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 854 | int free_usf = -1; |
Daniel Willmann | cf1fae7 | 2014-05-30 17:58:01 +0200 | [diff] [blame] | 855 | |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 856 | if (first_common_ts >= 0) |
| 857 | ul_slots = 1 << first_common_ts; |
| 858 | else |
| 859 | ul_slots = ul_slots & dl_slots; |
| 860 | |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 861 | ts = find_least_busy_pdch(trx, GPRS_RLCMAC_UL_TBF, |
Jacob Erlbeck | c135b87 | 2015-07-09 13:44:18 +0200 | [diff] [blame] | 862 | ul_slots, compute_usage_by_num_tbfs, |
Jacob Erlbeck | e0853cd | 2015-07-10 12:25:25 +0200 | [diff] [blame] | 863 | NULL, &free_usf); |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 864 | |
| 865 | if (free_usf < 0) { |
| 866 | LOGP(DRLCMAC, LOGL_NOTICE, "No USF available\n"); |
| 867 | return -EBUSY; |
| 868 | } |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 869 | OSMO_ASSERT(ts >= 0 && ts <= 8); |
| 870 | |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 871 | ul_slots = 1 << ts; |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 872 | usf[ts] = free_usf; |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 873 | |
| 874 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 875 | "- Selected UL slots: (TS=0)\"%s\"(TS=7)%s\n", |
| 876 | set_flag_chars(set_flag_chars(slot_info, |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 877 | reserved_ul_slots, 'u', '.'), |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 878 | ul_slots, 'U'), |
| 879 | single ? ", single" : ""); |
| 880 | |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 881 | slotcount++; |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 882 | first_ts = ts; |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 883 | |
Jacob Erlbeck | 5f494b8 | 2015-07-01 13:10:41 +0200 | [diff] [blame] | 884 | /* We will stick to that single UL slot, unreserve the others */ |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 885 | reserved_ul_slots = ul_slots; |
Jacob Erlbeck | 5f494b8 | 2015-07-01 13:10:41 +0200 | [diff] [blame] | 886 | |
Jacob Erlbeck | 8cba7e9 | 2016-01-19 15:48:03 +0100 | [diff] [blame] | 887 | avail_count = pcu_bitcount(reserved_ul_slots); |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 888 | } |
| 889 | |
Jacob Erlbeck | ea65c72 | 2015-06-22 16:14:23 +0200 | [diff] [blame] | 890 | first_common_ts = ffs(dl_slots & ul_slots) - 1; |
| 891 | |
| 892 | if (first_common_ts < 0) { |
| 893 | LOGP(DRLCMAC, LOGL_NOTICE, "No first common slots available\n"); |
| 894 | return -EINVAL; |
| 895 | } |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 896 | if (first_ts < 0) { |
| 897 | LOGP(DRLCMAC, LOGL_NOTICE, "No first slot available\n"); |
| 898 | return -EINVAL; |
| 899 | } |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 900 | |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 901 | if (single && slotcount) { |
| 902 | tbf_->upgrade_to_multislot = (avail_count > slotcount); |
| 903 | LOGP(DRLCMAC, LOGL_INFO, "Using single slot at TS %d for %s\n", |
| 904 | first_ts, |
| 905 | (tbf->direction == GPRS_RLCMAC_DL_TBF) ? "DL" : "UL"); |
| 906 | } else { |
| 907 | tbf_->upgrade_to_multislot = 0; |
| 908 | LOGP(DRLCMAC, LOGL_INFO, "Using %d slots for %s\n", slotcount, |
| 909 | (tbf->direction == GPRS_RLCMAC_DL_TBF) ? "DL" : "UL"); |
| 910 | } |
| 911 | |
| 912 | /* The allocation will be successful, so the system state and tbf_/ms_ |
| 913 | * may be modified from now on. */ |
| 914 | |
| 915 | /* Step 4: Update MS and TBF and really allocate the resources */ |
| 916 | |
| 917 | /* The reserved slots have changed, update the MS */ |
| 918 | if (reserved_ul_slots != ms->reserved_ul_slots() || |
| 919 | reserved_dl_slots != ms->reserved_dl_slots()) |
| 920 | { |
| 921 | ms_->set_reserved_slots(trx, |
| 922 | reserved_ul_slots, reserved_dl_slots); |
| 923 | |
| 924 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 925 | "- Reserved DL/UL slots: (TS=0)\"%s\"(TS=7)\n", |
| 926 | set_flag_chars(set_flag_chars(set_flag_chars(slot_info, |
| 927 | dl_slots, 'D', '.'), |
| 928 | ul_slots, 'U'), |
| 929 | ul_slots & dl_slots, 'C')); |
| 930 | } |
| 931 | |
| 932 | tbf_->trx = trx; |
| 933 | tbf_->first_common_ts = first_common_ts; |
| 934 | tbf_->first_ts = first_ts; |
| 935 | |
| 936 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) { |
Jacob Erlbeck | aa9daa1 | 2015-12-28 18:49:12 +0100 | [diff] [blame] | 937 | struct gprs_rlcmac_dl_tbf *dl_tbf = as_dl_tbf(tbf_); |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 938 | for (ts = 0; ts < 8; ts++) { |
| 939 | if (!(dl_slots & (1 << ts))) |
| 940 | continue; |
| 941 | |
| 942 | LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning DL TS " |
| 943 | "%d\n", ts); |
| 944 | assign_dlink_tbf(&trx->pdch[ts], dl_tbf, tfi); |
| 945 | } |
| 946 | } else { |
Jacob Erlbeck | aa9daa1 | 2015-12-28 18:49:12 +0100 | [diff] [blame] | 947 | struct gprs_rlcmac_ul_tbf *ul_tbf = as_ul_tbf(tbf_); |
Jacob Erlbeck | 5a2b8be | 2015-07-14 11:35:21 +0200 | [diff] [blame] | 948 | |
| 949 | for (ts = 0; ts < 8; ts++) { |
| 950 | if (!(ul_slots & (1 << ts))) |
| 951 | continue; |
| 952 | |
| 953 | OSMO_ASSERT(usf[ts] >= 0); |
| 954 | |
| 955 | LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning UL TS " |
| 956 | "%d\n", ts); |
| 957 | assign_uplink_tbf_usf(&trx->pdch[ts], ul_tbf, |
| 958 | tfi, usf[ts]); |
| 959 | } |
| 960 | } |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 961 | |
Jacob Erlbeck | 5979fe9 | 2015-07-14 14:02:41 +0200 | [diff] [blame] | 962 | bts->bts->tbf_alloc_algo_b(); |
| 963 | |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 964 | return 0; |
| 965 | } |
Jacob Erlbeck | 400ec02 | 2015-07-14 13:31:48 +0200 | [diff] [blame] | 966 | |
Max | e9fe0e3 | 2017-09-28 15:56:05 +0200 | [diff] [blame] | 967 | /*! Slot Allocation: Algorithm dynamic |
Jacob Erlbeck | 400ec02 | 2015-07-14 13:31:48 +0200 | [diff] [blame] | 968 | * |
| 969 | * This meta algorithm automatically selects on of the other algorithms based |
| 970 | * on the current system state. |
| 971 | * |
| 972 | * The goal is to support as many MS and TBF as possible. On low usage, the |
| 973 | * goal is to provide the highest possible bandwidth per MS. |
| 974 | * |
Max | e9fe0e3 | 2017-09-28 15:56:05 +0200 | [diff] [blame] | 975 | * \param[in,out] bts Pointer to BTS struct |
| 976 | * \param[in,out] ms_ Pointer to MS object |
| 977 | * \param[in,out] tbf_ Pointer to TBF struct |
| 978 | * \param[in] single flag indicating if we should force single-slot allocation |
| 979 | * \param[in] use_trx which TRX to use or -1 if it should be selected during allocation |
| 980 | * \returns negative error code or 0 on success |
Jacob Erlbeck | 400ec02 | 2015-07-14 13:31:48 +0200 | [diff] [blame] | 981 | */ |
Max | e9fe0e3 | 2017-09-28 15:56:05 +0200 | [diff] [blame] | 982 | int alloc_algorithm_dynamic(struct gprs_rlcmac_bts *bts, GprsMs *ms_, struct gprs_rlcmac_tbf *tbf_, bool single, |
| 983 | int8_t use_trx) |
Jacob Erlbeck | 400ec02 | 2015-07-14 13:31:48 +0200 | [diff] [blame] | 984 | { |
| 985 | int rc; |
| 986 | |
Jacob Erlbeck | 77da355 | 2015-07-16 18:33:46 +0200 | [diff] [blame] | 987 | /* Reset load_is_high if there is at least one idle PDCH */ |
| 988 | if (bts->multislot_disabled) { |
| 989 | bts->multislot_disabled = find_idle_pdch(bts->bts) == NULL; |
| 990 | if (!bts->multislot_disabled) |
| 991 | LOGP(DRLCMAC, LOGL_DEBUG, "Enabling algorithm B\n"); |
| 992 | } |
| 993 | |
| 994 | if (!bts->multislot_disabled) { |
Max | e9fe0e3 | 2017-09-28 15:56:05 +0200 | [diff] [blame] | 995 | rc = alloc_algorithm_b(bts, ms_, tbf_, single, use_trx); |
Jacob Erlbeck | 77da355 | 2015-07-16 18:33:46 +0200 | [diff] [blame] | 996 | if (rc >= 0) |
| 997 | return rc; |
| 998 | |
| 999 | if (!bts->multislot_disabled) |
| 1000 | LOGP(DRLCMAC, LOGL_DEBUG, "Disabling algorithm B\n"); |
| 1001 | bts->multislot_disabled = 1; |
| 1002 | } |
Jacob Erlbeck | 400ec02 | 2015-07-14 13:31:48 +0200 | [diff] [blame] | 1003 | |
Max | e9fe0e3 | 2017-09-28 15:56:05 +0200 | [diff] [blame] | 1004 | return alloc_algorithm_a(bts, ms_, tbf_, single, use_trx); |
Jacob Erlbeck | 400ec02 | 2015-07-14 13:31:48 +0200 | [diff] [blame] | 1005 | } |
Jacob Erlbeck | 7f79f0d | 2015-07-17 11:38:49 +0200 | [diff] [blame] | 1006 | |
| 1007 | int gprs_alloc_max_dl_slots_per_ms(struct gprs_rlcmac_bts *bts, uint8_t ms_class) |
| 1008 | { |
Max | 842d781 | 2017-11-01 18:11:24 +0100 | [diff] [blame] | 1009 | int rx = mslot_class_get_rx(ms_class); |
Jacob Erlbeck | 7f79f0d | 2015-07-17 11:38:49 +0200 | [diff] [blame] | 1010 | |
| 1011 | if (rx == MS_NA) |
| 1012 | rx = 4; |
| 1013 | |
| 1014 | if (bts->alloc_algorithm == alloc_algorithm_a) |
| 1015 | return 1; |
| 1016 | |
| 1017 | if (bts->multislot_disabled) |
| 1018 | return 1; |
| 1019 | |
| 1020 | return rx; |
| 1021 | } |