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> |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 27 | |
| 28 | #include <errno.h> |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 29 | #include <values.h> |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 30 | |
| 31 | /* 3GPP TS 05.02 Annex B.1 */ |
| 32 | |
| 33 | #define MS_NA 255 /* N/A */ |
| 34 | #define MS_A 254 /* 1 with hopping, 0 without */ |
| 35 | #define MS_B 253 /* 1 with hopping, 0 without (change Rx to Tx)*/ |
| 36 | #define MS_C 252 /* 1 with hopping, 0 without (change Tx to Rx)*/ |
| 37 | |
| 38 | struct gprs_ms_multislot_class { |
| 39 | uint8_t rx, tx, sum; /* Maximum Number of Slots: RX, Tx, Sum Rx+Tx */ |
| 40 | uint8_t ta, tb, ra, rb; /* Minimum Number of Slots */ |
| 41 | uint8_t type; /* Type of Mobile */ |
| 42 | }; |
| 43 | |
| 44 | static const struct gprs_ms_multislot_class gprs_ms_multislot_class[32] = { |
| 45 | /* M-S Class Rx Tx Sum Tta Ttb Tra Trb Type */ |
| 46 | /* N/A */ { MS_NA,MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA }, |
| 47 | /* 1 */ { 1, 1, 2, 3, 2, 4, 2, 1 }, |
| 48 | /* 2 */ { 2, 1, 3, 3, 2, 3, 1, 1 }, |
| 49 | /* 3 */ { 2, 2, 3, 3, 2, 3, 1, 1 }, |
| 50 | /* 4 */ { 3, 1, 4, 3, 1, 3, 1, 1 }, |
| 51 | /* 5 */ { 2, 2, 4, 3, 1, 3, 1, 1 }, |
| 52 | /* 6 */ { 3, 2, 4, 3, 1, 3, 1, 1 }, |
| 53 | /* 7 */ { 3, 3, 4, 3, 1, 3, 1, 1 }, |
| 54 | /* 8 */ { 4, 1, 5, 3, 1, 2, 1, 1 }, |
| 55 | /* 9 */ { 3, 2, 5, 3, 1, 2, 1, 1 }, |
| 56 | /* 10 */ { 4, 2, 5, 3, 1, 2, 1, 1 }, |
| 57 | /* 11 */ { 4, 3, 5, 3, 1, 2, 1, 1 }, |
| 58 | /* 12 */ { 4, 4, 5, 2, 1, 2, 1, 1 }, |
| 59 | /* 13 */ { 3, 3, MS_NA, MS_NA, MS_A, 3, MS_A, 2 }, |
| 60 | /* 14 */ { 4, 4, MS_NA, MS_NA, MS_A, 3, MS_A, 2 }, |
| 61 | /* 15 */ { 5, 5, MS_NA, MS_NA, MS_A, 3, MS_A, 2 }, |
| 62 | /* 16 */ { 6, 6, MS_NA, MS_NA, MS_A, 2, MS_A, 2 }, |
| 63 | /* 17 */ { 7, 7, MS_NA, MS_NA, MS_A, 1, 0, 2 }, |
| 64 | /* 18 */ { 8, 8, MS_NA, MS_NA, 0, 0, 0, 2 }, |
| 65 | /* 19 */ { 6, 2, MS_NA, 3, MS_B, 2, MS_C, 1 }, |
| 66 | /* 20 */ { 6, 3, MS_NA, 3, MS_B, 2, MS_C, 1 }, |
| 67 | /* 21 */ { 6, 4, MS_NA, 3, MS_B, 2, MS_C, 1 }, |
| 68 | /* 22 */ { 6, 4, MS_NA, 2, MS_B, 2, MS_C, 1 }, |
| 69 | /* 23 */ { 6, 6, MS_NA, 2, MS_B, 2, MS_C, 1 }, |
| 70 | /* 24 */ { 8, 2, MS_NA, 3, MS_B, 2, MS_C, 1 }, |
| 71 | /* 25 */ { 8, 3, MS_NA, 3, MS_B, 2, MS_C, 1 }, |
| 72 | /* 26 */ { 8, 4, MS_NA, 3, MS_B, 2, MS_C, 1 }, |
| 73 | /* 27 */ { 8, 4, MS_NA, 2, MS_B, 2, MS_C, 1 }, |
| 74 | /* 28 */ { 8, 6, MS_NA, 2, MS_B, 2, MS_C, 1 }, |
| 75 | /* 29 */ { 8, 8, MS_NA, 2, MS_B, 2, MS_C, 1 }, |
| 76 | /* N/A */ { MS_NA,MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA }, |
| 77 | /* N/A */ { MS_NA,MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA, MS_NA }, |
| 78 | }; |
| 79 | |
Holger Hans Peter Freyther | 6796ed2 | 2013-10-20 16:45:10 +0200 | [diff] [blame] | 80 | 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] | 81 | { |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 82 | struct gprs_rlcmac_ul_tbf *tbf; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 83 | uint8_t usf_map = 0; |
| 84 | uint8_t tfi, usf; |
| 85 | |
| 86 | /* make map of used USF */ |
| 87 | for (tfi = 0; tfi < 32; tfi++) { |
Daniel Willmann | 17a1d5e | 2014-05-30 20:21:30 +0200 | [diff] [blame] | 88 | tbf = pdch->ul_tbf_by_tfi(tfi); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 89 | if (!tbf) |
| 90 | continue; |
Daniel Willmann | 7e994e3 | 2014-08-07 15:49:21 +0200 | [diff] [blame] | 91 | usf_map |= (1 << tbf->m_usf[pdch->ts_no]); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 92 | } |
| 93 | |
| 94 | /* look for USF, don't use USF=7 */ |
| 95 | for (usf = 0; usf < 7; usf++) { |
| 96 | if (!(usf_map & (1 << usf))) |
| 97 | return usf; |
| 98 | } |
| 99 | |
| 100 | return -1; |
| 101 | } |
| 102 | |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 103 | static int find_possible_pdchs(struct gprs_rlcmac_trx *trx, |
Jacob Erlbeck | 83426b2 | 2015-06-30 09:44:05 +0200 | [diff] [blame^] | 104 | size_t max_slots, |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 105 | uint8_t mask, const char *mask_reason = NULL) |
Holger Hans Peter Freyther | b0a0075 | 2013-09-29 08:18:17 +0200 | [diff] [blame] | 106 | { |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 107 | unsigned ts; |
| 108 | int valid_ts_set = 0; |
Jacob Erlbeck | 83426b2 | 2015-06-30 09:44:05 +0200 | [diff] [blame^] | 109 | int8_t last_tsc = -1; /* must be signed */ |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 110 | |
| 111 | for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) { |
Holger Hans Peter Freyther | b0a0075 | 2013-09-29 08:18:17 +0200 | [diff] [blame] | 112 | struct gprs_rlcmac_pdch *pdch; |
| 113 | |
| 114 | pdch = &trx->pdch[ts]; |
Holger Hans Peter Freyther | 17b0d83 | 2013-10-19 17:37:48 +0200 | [diff] [blame] | 115 | if (!pdch->is_enabled()) { |
Holger Hans Peter Freyther | b0a0075 | 2013-09-29 08:18:17 +0200 | [diff] [blame] | 116 | LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, because " |
| 117 | "not enabled\n", ts); |
| 118 | continue; |
| 119 | } |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 120 | |
| 121 | if (((1 << ts) & mask) == 0) { |
| 122 | if (mask_reason) |
| 123 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 124 | "- Skipping TS %d, because %s\n", |
| 125 | ts, mask_reason); |
| 126 | continue; |
| 127 | } |
| 128 | |
Jacob Erlbeck | 83426b2 | 2015-06-30 09:44:05 +0200 | [diff] [blame^] | 129 | if (max_slots > 1) { |
| 130 | /* check if TSC changes, see TS 45.002, 6.4.2 */ |
| 131 | if (last_tsc < 0) |
| 132 | last_tsc = pdch->tsc; |
| 133 | else if (last_tsc != pdch->tsc) { |
| 134 | LOGP(DRLCMAC, LOGL_ERROR, |
| 135 | "Skipping TS %d of TRX=%d, because it " |
| 136 | "has different TSC than lower TS of TRX. " |
| 137 | "In order to allow multislot, all " |
| 138 | "slots must be configured with the same " |
| 139 | "TSC!\n", ts, trx->trx_no); |
| 140 | continue; |
| 141 | } |
| 142 | } |
| 143 | |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 144 | valid_ts_set |= 1 << ts; |
Holger Hans Peter Freyther | b0a0075 | 2013-09-29 08:18:17 +0200 | [diff] [blame] | 145 | } |
| 146 | |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 147 | return valid_ts_set; |
| 148 | } |
| 149 | |
| 150 | static int find_least_busy_pdch(struct gprs_rlcmac_trx *trx, |
| 151 | enum gprs_rlcmac_tbf_direction dir, |
| 152 | uint8_t mask, |
| 153 | int *free_usf = 0) |
| 154 | { |
| 155 | unsigned ts; |
| 156 | int min_used = INT_MAX; |
| 157 | int min_ts = -1; |
| 158 | int min_usf = -1; |
| 159 | |
| 160 | for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) { |
| 161 | struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; |
| 162 | int num_tbfs; |
| 163 | int usf = -1; /* must be signed */ |
| 164 | |
| 165 | if (((1 << ts) & mask) == 0) |
| 166 | continue; |
| 167 | |
| 168 | num_tbfs = pdch->num_tbfs(dir); |
| 169 | if (num_tbfs < min_used) { |
| 170 | /* We have found a candidate */ |
| 171 | /* Make sure that an USF is available */ |
| 172 | if (dir == GPRS_RLCMAC_UL_TBF) { |
| 173 | usf = find_free_usf(pdch); |
| 174 | if (usf < 0) { |
| 175 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 176 | "- Skipping TS %d, because " |
| 177 | "no USF available\n", ts); |
| 178 | continue; |
| 179 | } |
| 180 | } |
| 181 | if (min_ts >= 0) |
| 182 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 183 | "- Skipping TS %d, because " |
| 184 | "num TBFs %d > %d\n", |
| 185 | min_ts, min_used, num_tbfs); |
| 186 | min_used = num_tbfs; |
| 187 | min_ts = ts; |
| 188 | min_usf = usf; |
| 189 | } else { |
| 190 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 191 | "- Skipping TS %d, because " |
| 192 | "num TBFs %d >= %d\n", |
| 193 | ts, num_tbfs, min_used); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | if (min_ts < 0) |
| 198 | return -1; |
| 199 | |
| 200 | if (free_usf) |
| 201 | *free_usf = min_usf; |
| 202 | |
| 203 | return min_ts; |
Holger Hans Peter Freyther | b0a0075 | 2013-09-29 08:18:17 +0200 | [diff] [blame] | 204 | } |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 205 | |
Jacob Erlbeck | ccc34e4 | 2015-06-29 13:45:05 +0200 | [diff] [blame] | 206 | static void attach_tbf_to_pdch(struct gprs_rlcmac_pdch *pdch, |
| 207 | struct gprs_rlcmac_tbf *tbf) |
| 208 | { |
| 209 | if (tbf->pdch[pdch->ts_no]) |
| 210 | tbf->pdch[pdch->ts_no]->detach_tbf(tbf); |
| 211 | |
| 212 | tbf->pdch[pdch->ts_no] = pdch; |
| 213 | pdch->attach_tbf(tbf); |
| 214 | } |
| 215 | |
Holger Hans Peter Freyther | 743bafa | 2013-09-29 07:50:50 +0200 | [diff] [blame] | 216 | static void assign_uplink_tbf_usf( |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 217 | struct gprs_rlcmac_pdch *pdch, |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 218 | struct gprs_rlcmac_ul_tbf *tbf, int8_t usf) |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 219 | { |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 220 | tbf->trx->ul_tbf[tbf->tfi()] = tbf; |
Daniel Willmann | 7e994e3 | 2014-08-07 15:49:21 +0200 | [diff] [blame] | 221 | tbf->m_usf[pdch->ts_no] = usf; |
Jacob Erlbeck | ccc34e4 | 2015-06-29 13:45:05 +0200 | [diff] [blame] | 222 | attach_tbf_to_pdch(pdch, tbf); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 223 | } |
| 224 | |
Holger Hans Peter Freyther | 8481a05 | 2013-09-29 08:08:28 +0200 | [diff] [blame] | 225 | static void assign_dlink_tbf( |
| 226 | struct gprs_rlcmac_pdch *pdch, |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 227 | struct gprs_rlcmac_dl_tbf *tbf) |
Holger Hans Peter Freyther | 8481a05 | 2013-09-29 08:08:28 +0200 | [diff] [blame] | 228 | { |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 229 | tbf->trx->dl_tbf[tbf->tfi()] = tbf; |
Jacob Erlbeck | ccc34e4 | 2015-06-29 13:45:05 +0200 | [diff] [blame] | 230 | attach_tbf_to_pdch(pdch, tbf); |
Holger Hans Peter Freyther | 8481a05 | 2013-09-29 08:08:28 +0200 | [diff] [blame] | 231 | } |
| 232 | |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 233 | |
| 234 | /* Slot Allocation: Algorithm A |
| 235 | * |
| 236 | * Assign single slot for uplink and downlink |
| 237 | */ |
| 238 | int alloc_algorithm_a(struct gprs_rlcmac_bts *bts, |
Jacob Erlbeck | e2e004e | 2015-06-18 17:16:26 +0200 | [diff] [blame] | 239 | GprsMs *ms, |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 240 | struct gprs_rlcmac_tbf *tbf, uint32_t cust, uint8_t single) |
| 241 | { |
| 242 | struct gprs_rlcmac_pdch *pdch; |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 243 | int ts = -1; |
| 244 | int usf = -1; |
| 245 | int mask = 0xff; |
| 246 | const char *mask_reason = NULL; |
| 247 | struct gprs_rlcmac_tbf *ref_tbf; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 248 | |
| 249 | LOGP(DRLCMAC, LOGL_DEBUG, "Slot Allocation (Algorithm A) for class " |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 250 | "%d\n", tbf->ms_class()); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 251 | |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 252 | if ((ref_tbf = ms->tbf(tbf->direction))) |
| 253 | mask_reason = "need to reuse TS"; |
| 254 | else if ((ref_tbf = ms->tbf(reverse(tbf->direction)))) |
| 255 | mask_reason = ref_tbf->direction == GPRS_RLCMAC_UL_TBF ? |
| 256 | "not an uplink TBF" : "not a downlink TBF"; |
| 257 | |
| 258 | if (ref_tbf) |
| 259 | ts = ref_tbf->first_common_ts; |
| 260 | |
| 261 | if (ts >= 0) |
| 262 | mask = 1 << ts; |
| 263 | |
Jacob Erlbeck | 83426b2 | 2015-06-30 09:44:05 +0200 | [diff] [blame^] | 264 | mask = find_possible_pdchs(tbf->trx, 1, mask, mask_reason); |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 265 | if (!mask) |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 266 | return -EINVAL; |
| 267 | |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 268 | ts = find_least_busy_pdch(tbf->trx, tbf->direction, mask, &usf); |
| 269 | |
| 270 | if (ts < 0) { |
| 271 | LOGP(DRLCMAC, LOGL_NOTICE, "- Failed " |
| 272 | "to allocate a TS, no USF available\n"); |
| 273 | return -EBUSY; |
| 274 | } |
| 275 | |
Holger Hans Peter Freyther | b0a0075 | 2013-09-29 08:18:17 +0200 | [diff] [blame] | 276 | pdch = &tbf->trx->pdch[ts]; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 277 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 278 | struct gprs_rlcmac_ul_tbf *ul_tbf = static_cast<gprs_rlcmac_ul_tbf *>(tbf); |
Holger Hans Peter Freyther | 948a3d6 | 2013-09-30 14:10:23 +0200 | [diff] [blame] | 279 | |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 280 | if (usf < 0) |
| 281 | usf = find_free_usf(pdch); |
| 282 | |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 283 | if (usf < 0) { |
| 284 | LOGP(DRLCMAC, LOGL_NOTICE, "- Failed " |
| 285 | "allocating TS=%d, no USF available\n", ts); |
| 286 | return -EBUSY; |
| 287 | } |
Jacob Erlbeck | ec47875 | 2015-06-19 16:35:38 +0200 | [diff] [blame] | 288 | |
| 289 | LOGP(DRLCMAC, LOGL_DEBUG, "- Assign uplink TS=%d USF=%d\n", |
| 290 | ts, usf); |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 291 | assign_uplink_tbf_usf(pdch, ul_tbf, usf); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 292 | } else { |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 293 | struct gprs_rlcmac_dl_tbf *dl_tbf = static_cast<gprs_rlcmac_dl_tbf *>(tbf); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 294 | LOGP(DRLCMAC, LOGL_DEBUG, "- Assign downlink TS=%d\n", ts); |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 295 | assign_dlink_tbf(pdch, dl_tbf); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 296 | } |
| 297 | /* the only one TS is the common TS */ |
| 298 | tbf->first_ts = tbf->first_common_ts = ts; |
| 299 | |
Daniel Willmann | cf1fae7 | 2014-05-30 17:58:01 +0200 | [diff] [blame] | 300 | tbf->upgrade_to_multislot = 0; |
| 301 | |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 302 | return 0; |
| 303 | } |
| 304 | |
Holger Hans Peter Freyther | 882fc9b | 2013-12-25 20:34:26 +0100 | [diff] [blame] | 305 | /* |
| 306 | * Select a window of Rx slots if available. |
| 307 | * The maximum allowed slots depend on RX or the window of available |
| 308 | * slots. This must be done for uplink TBF also, because it is the basis |
| 309 | * for calculating control slot and uplink slot(s). |
| 310 | */ |
| 311 | static uint8_t select_dl_slots(struct gprs_rlcmac_trx *trx, |
| 312 | const int ms_type, const int ms_max_rxslots, |
| 313 | uint8_t *out_rx_win_min, uint8_t *out_rx_win_max) |
| 314 | |
| 315 | { |
| 316 | uint8_t rx_window = 0; |
| 317 | int rx_window_size = 0; |
| 318 | int8_t last_tsc = -1; /* must be signed */ |
| 319 | uint8_t rx_win_min = 0, rx_win_max = 0; |
| 320 | |
| 321 | for (int ts_no = 0; ts_no < 8; ts_no++) { |
| 322 | struct gprs_rlcmac_pdch *pdch; |
| 323 | pdch = &trx->pdch[ts_no]; |
| 324 | |
| 325 | /* check if enabled */ |
| 326 | if (!pdch->is_enabled()) { |
| 327 | LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, because " |
| 328 | "not enabled\n", ts_no); |
| 329 | if (ms_type == 1 && rx_window) |
Andreas Eversberg | b03d427 | 2014-01-04 15:14:19 +0100 | [diff] [blame] | 330 | goto inc_window; |
Holger Hans Peter Freyther | 882fc9b | 2013-12-25 20:34:26 +0100 | [diff] [blame] | 331 | continue; |
| 332 | } |
| 333 | /* check if TSC changes */ |
| 334 | if (last_tsc < 0) |
| 335 | last_tsc = pdch->tsc; |
| 336 | else if (last_tsc != pdch->tsc) { |
| 337 | LOGP(DRLCMAC, LOGL_ERROR, "Skipping TS %d of TRX=%d, " |
| 338 | "because it has different TSC than lower TS " |
| 339 | "of TRX. In order to allow multislot, all " |
| 340 | "slots must be configured with the same " |
| 341 | "TSC!\n", ts_no, trx->trx_no); |
| 342 | if (ms_type == 1 && rx_window) |
Andreas Eversberg | b03d427 | 2014-01-04 15:14:19 +0100 | [diff] [blame] | 343 | goto inc_window; |
Holger Hans Peter Freyther | 882fc9b | 2013-12-25 20:34:26 +0100 | [diff] [blame] | 344 | continue; |
| 345 | } |
| 346 | |
| 347 | if (!rx_window) |
| 348 | rx_win_min = ts_no; |
| 349 | |
| 350 | rx_window |= (1 << ts_no); |
| 351 | LOGP(DRLCMAC, LOGL_DEBUG, "- Selected DL TS %d\n", ts_no); |
| 352 | |
| 353 | /* range of window (required for Type 1) */ |
| 354 | rx_win_max = ts_no; |
| 355 | |
Andreas Eversberg | b03d427 | 2014-01-04 15:14:19 +0100 | [diff] [blame] | 356 | inc_window: |
Holger Hans Peter Freyther | 882fc9b | 2013-12-25 20:34:26 +0100 | [diff] [blame] | 357 | if (++rx_window_size == ms_max_rxslots) { |
| 358 | LOGP(DRLCMAC, LOGL_DEBUG, "- Done, because slots / " |
| 359 | "window reached maximum alowed Rx size\n"); |
| 360 | break; |
| 361 | } |
Andreas Eversberg | ccde4c4 | 2014-01-04 15:17:22 +0100 | [diff] [blame] | 362 | if (ms_type == 1 && rx_window_size == 5) { |
| 363 | LOGP(DRLCMAC, LOGL_DEBUG, "- Done, because slots / " |
| 364 | "window reached maximum supported Rx size of " |
| 365 | "this algorithm\n"); |
| 366 | break; |
| 367 | } |
Holger Hans Peter Freyther | 882fc9b | 2013-12-25 20:34:26 +0100 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | LOGP(DRLCMAC, LOGL_DEBUG, "- Selected slots for RX: " |
| 371 | "(TS=0)\"%c%c%c%c%c%c%c%c\"(TS=7)\n", |
| 372 | ((rx_window & 0x01)) ? 'D' : '.', |
| 373 | ((rx_window & 0x02)) ? 'D' : '.', |
| 374 | ((rx_window & 0x04)) ? 'D' : '.', |
| 375 | ((rx_window & 0x08)) ? 'D' : '.', |
| 376 | ((rx_window & 0x10)) ? 'D' : '.', |
| 377 | ((rx_window & 0x20)) ? 'D' : '.', |
| 378 | ((rx_window & 0x40)) ? 'D' : '.', |
| 379 | ((rx_window & 0x80)) ? 'D' : '.'); |
| 380 | |
| 381 | *out_rx_win_min = rx_win_min; |
| 382 | *out_rx_win_max = rx_win_max; |
| 383 | return rx_window; |
| 384 | } |
| 385 | |
Jacob Erlbeck | e2e004e | 2015-06-18 17:16:26 +0200 | [diff] [blame] | 386 | static int reduce_rx_window(const int ms_type, const GprsMs *ms, |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 387 | const int Tt, const int Tr, |
| 388 | int *rx_window, |
| 389 | uint8_t *rx_win_min, uint8_t *rx_win_max) |
| 390 | { |
Jacob Erlbeck | e2e004e | 2015-06-18 17:16:26 +0200 | [diff] [blame] | 391 | gprs_rlcmac_ul_tbf *ul_tbf; |
| 392 | |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 393 | if (ms_type != 1) |
| 394 | return 0; |
Jacob Erlbeck | e2e004e | 2015-06-18 17:16:26 +0200 | [diff] [blame] | 395 | if (!ms) |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 396 | return 0; |
Jacob Erlbeck | e2e004e | 2015-06-18 17:16:26 +0200 | [diff] [blame] | 397 | |
| 398 | ul_tbf = ms->ul_tbf(); |
| 399 | |
| 400 | if (!ul_tbf) |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 401 | return 0; |
| 402 | |
| 403 | uint8_t collide = 0, ul_usage = 0; |
| 404 | |
| 405 | /* calculate mask of colliding slots */ |
| 406 | for (uint8_t ts_no = 0; ts_no < 8; ts_no++) { |
| 407 | int j; |
Jacob Erlbeck | e2e004e | 2015-06-18 17:16:26 +0200 | [diff] [blame] | 408 | if (!ul_tbf->pdch[ts_no]) |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 409 | continue; |
| 410 | |
| 411 | ul_usage |= (1 << ts_no); |
| 412 | /* mark bits from TS-t .. TS+r */ |
Andreas Eversberg | 9167055 | 2014-05-29 11:08:58 +0200 | [diff] [blame] | 413 | for (j = (ts_no - Tt) & 7; j != ((ts_no + Tr + 1) & 7); j = (j + 1) & 7) |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 414 | collide |= (1 << j); |
| 415 | } |
| 416 | |
| 417 | LOGP(DRLCMAC, LOGL_DEBUG, "- Not allowed slots due to existing " |
| 418 | "UL allocation: (TS=0)\"%c%c%c%c%c%c%c%c\"(TS=7) " |
| 419 | " D=downlink x=not usable\n", |
| 420 | ((ul_usage & 0x01)) ? 'D' : ((collide & 0x01))?'x':'.', |
| 421 | ((ul_usage & 0x02)) ? 'D' : ((collide & 0x02))?'x':'.', |
| 422 | ((ul_usage & 0x04)) ? 'D' : ((collide & 0x04))?'x':'.', |
| 423 | ((ul_usage & 0x08)) ? 'D' : ((collide & 0x08))?'x':'.', |
| 424 | ((ul_usage & 0x10)) ? 'D' : ((collide & 0x10))?'x':'.', |
| 425 | ((ul_usage & 0x20)) ? 'D' : ((collide & 0x20))?'x':'.', |
| 426 | ((ul_usage & 0x40)) ? 'D' : ((collide & 0x40))?'x':'.', |
| 427 | ((ul_usage & 0x80)) ? 'D' : ((collide & 0x80))?'x':'.'); |
| 428 | |
| 429 | /* |
| 430 | * Uplink/Downlink in GSM is shifted by three timeslots. Make |
| 431 | * sure they don't collide. |
| 432 | */ |
| 433 | *rx_window &= ~(collide << 3); |
| 434 | *rx_window &= ~(collide >> 5); |
| 435 | LOGP(DRLCMAC, LOGL_DEBUG, "- Remaining slots for RX: " |
| 436 | "(TS=0)\"%c%c%c%c%c%c%c%c\"(TS=7)\n", |
| 437 | ((*rx_window & 0x01)) ? 'D' : '.', |
| 438 | ((*rx_window & 0x02)) ? 'D' : '.', |
| 439 | ((*rx_window & 0x04)) ? 'D' : '.', |
| 440 | ((*rx_window & 0x08)) ? 'D' : '.', |
| 441 | ((*rx_window & 0x10)) ? 'D' : '.', |
| 442 | ((*rx_window & 0x20)) ? 'D' : '.', |
| 443 | ((*rx_window & 0x40)) ? 'D' : '.', |
| 444 | ((*rx_window & 0x80)) ? 'D' : '.'); |
| 445 | |
| 446 | if (!*rx_window) { |
| 447 | LOGP(DRLCMAC, LOGL_NOTICE, "No suitable downlink slots " |
| 448 | "available with current uplink assignment\n"); |
| 449 | return -EBUSY; |
| 450 | } |
| 451 | |
Andreas Eversberg | 1cd9d88 | 2014-01-04 15:42:38 +0100 | [diff] [blame] | 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | /* shrink range of rx_win_min and rx_win_max */ |
| 456 | static void shrink_rx_window(uint8_t *rx_win_min, uint8_t *rx_win_max, int rx_window) |
| 457 | { |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 458 | /* calculate new min/max */ |
| 459 | for (uint8_t ts_no = *rx_win_min; ts_no <= *rx_win_max; ts_no++) { |
Andreas Eversberg | 1cd9d88 | 2014-01-04 15:42:38 +0100 | [diff] [blame] | 460 | if ((rx_window & (1 << ts_no))) |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 461 | break; |
| 462 | *rx_win_min = ts_no + 1; |
Andreas Eversberg | 1cd9d88 | 2014-01-04 15:42:38 +0100 | [diff] [blame] | 463 | LOGP(DRLCMAC, LOGL_DEBUG, "- TS is unused, so " |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 464 | "raising start of DL window to %d\n", |
| 465 | *rx_win_min); |
| 466 | } |
| 467 | for (uint8_t ts_no = *rx_win_max; ts_no >= *rx_win_min; ts_no--) { |
Andreas Eversberg | 1cd9d88 | 2014-01-04 15:42:38 +0100 | [diff] [blame] | 468 | if ((rx_window & (1 << ts_no))) |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 469 | break; |
| 470 | *rx_win_max = ts_no - 1; |
Andreas Eversberg | 1cd9d88 | 2014-01-04 15:42:38 +0100 | [diff] [blame] | 471 | LOGP(DRLCMAC, LOGL_DEBUG, "- TS is unused, so " |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 472 | "lowering end of DL window to %d\n", |
| 473 | *rx_win_max); |
| 474 | } |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 475 | } |
| 476 | |
Holger Hans Peter Freyther | dd4af80 | 2013-12-25 21:03:42 +0100 | [diff] [blame] | 477 | /* |
| 478 | * reduce window, to allow at least one uplink TX slot |
| 479 | * this is only required for Type 1 |
| 480 | */ |
| 481 | static uint8_t update_rx_win_max(const int ms_type, const int Tt, |
| 482 | const int Tr, uint8_t rx_win_min, uint8_t rx_win_max) |
| 483 | { |
| 484 | if (ms_type != 1) |
| 485 | return rx_win_max; |
| 486 | |
| 487 | if (rx_win_max - rx_win_min + 1 + Tt + 1 + Tr > 8) { |
| 488 | rx_win_max = rx_win_min + 7 - Tt - 1 - Tr; |
| 489 | LOGP(DRLCMAC, LOGL_DEBUG, "- Reduce RX window due to time " |
| 490 | "contraints to %d slots\n", rx_win_max - rx_win_min + 1); |
| 491 | } |
| 492 | |
| 493 | return rx_win_max; |
| 494 | } |
| 495 | |
Holger Hans Peter Freyther | 3fd2ddf | 2013-12-25 21:11:20 +0100 | [diff] [blame] | 496 | static void tx_win_from_rx(const int ms_type, |
| 497 | uint8_t rx_win_min, uint8_t rx_win_max, |
| 498 | int Tt, int Tr, |
| 499 | uint8_t *tx_win_min, uint8_t *tx_win_max, |
| 500 | uint8_t *tx_range) |
| 501 | { |
| 502 | if (ms_type == 1) { |
| 503 | /* calculate TX window (shifted by 3 timeslots) |
| 504 | * it uses the space between tx_win_max and tx_win_min */ |
| 505 | *tx_win_min = (rx_win_max - 2 + Tt) & 7; |
| 506 | *tx_win_max = (rx_win_min + 4 - Tr) & 7; |
| 507 | } else { |
| 508 | /* TX and RX simultaniously */ |
| 509 | *tx_win_min = rx_win_min; |
| 510 | *tx_win_max = 7; |
| 511 | } |
| 512 | |
| 513 | *tx_range = (*tx_win_max - *tx_win_min + 1) & 7; |
Andreas Eversberg | 7a16d46 | 2014-01-04 15:25:18 +0100 | [diff] [blame] | 514 | /* if TX window fills complete range */ |
| 515 | if (*tx_range == 0) |
| 516 | *tx_range = 8; |
Holger Hans Peter Freyther | 3fd2ddf | 2013-12-25 21:11:20 +0100 | [diff] [blame] | 517 | LOGP(DRLCMAC, LOGL_DEBUG, "- TX-Window is: %d..%d\n", *tx_win_min, |
| 518 | *tx_win_max); |
| 519 | } |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 520 | |
Holger Hans Peter Freyther | 1fe6932 | 2013-12-26 09:31:31 +0100 | [diff] [blame] | 521 | /* |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 522 | * Select a window of Tx slots if available. |
| 523 | * The maximum allowed slots depend on TX or the window of available |
| 524 | * slots. |
| 525 | */ |
| 526 | static int select_ul_slots(gprs_rlcmac_trx *trx, |
| 527 | const int ms_type, const int ms_max_txslots, |
| 528 | uint8_t tx_win_min, uint8_t tx_range, |
Andreas Eversberg | 765736d | 2014-01-04 15:27:31 +0100 | [diff] [blame] | 529 | int8_t *usf, int8_t *first_common_ts, uint8_t rx_window) |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 530 | { |
| 531 | int tsc = -1; |
| 532 | uint8_t tx_window = 0; |
| 533 | int i; |
| 534 | uint8_t ts_no; |
| 535 | |
Andreas Eversberg | fe2dcc8 | 2014-01-04 15:39:54 +0100 | [diff] [blame] | 536 | for (ts_no = tx_win_min, i = 0; i < tx_range; ts_no = (ts_no + 1) & 7, i++) { |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 537 | gprs_rlcmac_pdch *pdch = &trx->pdch[ts_no]; |
| 538 | |
| 539 | /* check if enabled */ |
| 540 | if (!pdch->is_enabled()) { |
| 541 | LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, " |
| 542 | "because not enabled\n", ts_no); |
Andreas Eversberg | b03d427 | 2014-01-04 15:14:19 +0100 | [diff] [blame] | 543 | if (ms_type == 1 && tx_window) |
| 544 | goto inc_window; |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 545 | continue; |
| 546 | } |
Andreas Eversberg | 765736d | 2014-01-04 15:27:31 +0100 | [diff] [blame] | 547 | /* check if used as downlink */ |
| 548 | if (!(rx_window & (1 << ts_no))) { |
| 549 | LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, " |
| 550 | "because not a downlink slot\n", ts_no); |
| 551 | if (ms_type == 1 && tx_window) |
| 552 | goto inc_window; |
| 553 | continue; |
| 554 | } |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 555 | /* check if TSC changes */ |
| 556 | if (tsc < 0) |
| 557 | tsc = pdch->tsc; |
| 558 | else if (tsc != pdch->tsc) { |
| 559 | LOGP(DRLCMAC, LOGL_ERROR, "Skipping TS %d of " |
| 560 | "TRX=%d, because it has different TSC " |
| 561 | "than lower TS of TRX. In order to " |
| 562 | "allow multislot, all slots must be " |
| 563 | "configured with the same TSC!\n", |
| 564 | ts_no, trx->trx_no); |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 565 | if (ms_type == 1) |
Andreas Eversberg | b03d427 | 2014-01-04 15:14:19 +0100 | [diff] [blame] | 566 | goto inc_window; |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 567 | continue; |
| 568 | } |
| 569 | /* check for free usf */ |
| 570 | usf[ts_no] = find_free_usf(pdch); |
| 571 | if (usf[ts_no] < 0) { |
| 572 | LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, " |
| 573 | "because no USF available\n", ts_no); |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 574 | if (ms_type == 1) |
Andreas Eversberg | b03d427 | 2014-01-04 15:14:19 +0100 | [diff] [blame] | 575 | goto inc_window; |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 576 | continue; |
| 577 | } |
| 578 | |
| 579 | if (!tx_window) |
| 580 | *first_common_ts = ts_no; |
| 581 | |
| 582 | tx_window |= (1 << ts_no); |
| 583 | LOGP(DRLCMAC, LOGL_DEBUG, "- Selected UL TS %d\n", ts_no); |
| 584 | |
Andreas Eversberg | b03d427 | 2014-01-04 15:14:19 +0100 | [diff] [blame] | 585 | inc_window: |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 586 | if (1 && ms_type == 1) { /* FIXME: multislot UL assignment */ |
| 587 | LOGP(DRLCMAC, LOGL_DEBUG, "- Done, because " |
| 588 | "1 slot assigned\n"); |
| 589 | break; |
| 590 | } |
Andreas Eversberg | 0a94008 | 2014-01-15 13:53:43 +0100 | [diff] [blame] | 591 | if (i+1 == ms_max_txslots) { |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 592 | LOGP(DRLCMAC, LOGL_DEBUG, "- Done, because " |
| 593 | "slots / window reached maximum " |
| 594 | "allowed Tx size\n"); |
| 595 | break; |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | LOGP(DRLCMAC, LOGL_DEBUG, "- Selected TX window: " |
| 600 | "(TS=0)\"%c%c%c%c%c%c%c%c\"(TS=7)\n", |
| 601 | ((tx_window & 0x01)) ? 'U' : '.', |
| 602 | ((tx_window & 0x02)) ? 'U' : '.', |
| 603 | ((tx_window & 0x04)) ? 'U' : '.', |
| 604 | ((tx_window & 0x08)) ? 'U' : '.', |
| 605 | ((tx_window & 0x10)) ? 'U' : '.', |
| 606 | ((tx_window & 0x20)) ? 'U' : '.', |
| 607 | ((tx_window & 0x40)) ? 'U' : '.', |
| 608 | ((tx_window & 0x80)) ? 'U' : '.'); |
| 609 | |
| 610 | if (!tx_window) { |
| 611 | LOGP(DRLCMAC, LOGL_NOTICE, "No suitable uplink slots " |
| 612 | "available\n"); |
| 613 | return -EBUSY; |
| 614 | } |
| 615 | |
| 616 | return tx_window; |
| 617 | } |
| 618 | |
| 619 | /* |
Holger Hans Peter Freyther | 1fe6932 | 2013-12-26 09:31:31 +0100 | [diff] [blame] | 620 | * Assign the first common ts, which is used for control or |
| 621 | * single slot. |
| 622 | */ |
Andreas Eversberg | 765736d | 2014-01-04 15:27:31 +0100 | [diff] [blame] | 623 | static int select_first_ts(gprs_rlcmac_trx *trx, uint8_t tx_win_min, |
| 624 | uint8_t tx_range, uint8_t rx_window) |
Holger Hans Peter Freyther | 1fe6932 | 2013-12-26 09:31:31 +0100 | [diff] [blame] | 625 | { |
| 626 | uint8_t ts_no; |
| 627 | int i; |
Andreas Eversberg | fe2dcc8 | 2014-01-04 15:39:54 +0100 | [diff] [blame] | 628 | for (ts_no = tx_win_min, i = 0; i < tx_range; ts_no = (ts_no + 1) & 7, i++) { |
Holger Hans Peter Freyther | 1fe6932 | 2013-12-26 09:31:31 +0100 | [diff] [blame] | 629 | gprs_rlcmac_pdch *pdch = &trx->pdch[ts_no]; |
| 630 | /* check if enabled */ |
| 631 | if (!pdch->is_enabled()) { |
| 632 | LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, " |
| 633 | "because not enabled\n", ts_no); |
| 634 | continue; |
| 635 | } |
Andreas Eversberg | 765736d | 2014-01-04 15:27:31 +0100 | [diff] [blame] | 636 | /* check if used as downlink */ |
| 637 | if (!(rx_window & (1 << ts_no))) { |
| 638 | LOGP(DRLCMAC, LOGL_DEBUG, "- Skipping TS %d, " |
| 639 | "because not a downlink slot\n", ts_no); |
| 640 | continue; |
| 641 | } |
Holger Hans Peter Freyther | 1fe6932 | 2013-12-26 09:31:31 +0100 | [diff] [blame] | 642 | return ts_no; |
| 643 | } |
| 644 | |
| 645 | return -1; |
| 646 | } |
| 647 | |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 648 | /* Slot Allocation: Algorithm B |
| 649 | * |
| 650 | * Assign as many downlink slots as possible. |
| 651 | * Assign one uplink slot. (With free USF) |
| 652 | * |
| 653 | */ |
| 654 | int alloc_algorithm_b(struct gprs_rlcmac_bts *bts, |
Jacob Erlbeck | e2e004e | 2015-06-18 17:16:26 +0200 | [diff] [blame] | 655 | GprsMs *ms, |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 656 | struct gprs_rlcmac_tbf *tbf, uint32_t cust, uint8_t single) |
| 657 | { |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 658 | const struct gprs_ms_multislot_class *ms_class; |
Holger Hans Peter Freyther | 882fc9b | 2013-12-25 20:34:26 +0100 | [diff] [blame] | 659 | uint8_t Tx, Sum; /* Maximum Number of Slots: RX, Tx, Sum Rx+Tx */ |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 660 | uint8_t Tta, Ttb, Tra, Trb, Tt, Tr; /* Minimum Number of Slots */ |
| 661 | uint8_t Type; /* Type of Mobile */ |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 662 | int rx_window; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 663 | static const char *digit[10] = { "0","1","2","3","4","5","6","7","8","9" }; |
| 664 | int8_t usf[8] = { -1, -1, -1, -1, -1, -1, -1, -1 }; /* must be signed */ |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 665 | int8_t first_common_ts = -1; |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 666 | uint8_t ts; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 667 | uint8_t slotcount = 0; |
| 668 | |
| 669 | |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 670 | if (tbf->ms_class() >= 32) { |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 671 | LOGP(DRLCMAC, LOGL_ERROR, "Multislot class %d out of range.\n", |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 672 | tbf->ms_class()); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 673 | return -EINVAL; |
| 674 | } |
| 675 | |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 676 | if (tbf->ms_class()) { |
| 677 | ms_class = &gprs_ms_multislot_class[tbf->ms_class()]; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 678 | LOGP(DRLCMAC, LOGL_DEBUG, "Slot Allocation (Algorithm B) for " |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 679 | "class %d\n", tbf->ms_class()); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 680 | } else { |
| 681 | ms_class = &gprs_ms_multislot_class[12]; |
| 682 | LOGP(DRLCMAC, LOGL_DEBUG, "Slot Allocation (Algorithm B) for " |
| 683 | "unknow class (assuming 12)\n"); |
| 684 | } |
| 685 | |
| 686 | if (ms_class->tx == MS_NA) { |
| 687 | LOGP(DRLCMAC, LOGL_NOTICE, "Multislot class %d not " |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 688 | "applicable.\n", tbf->ms_class()); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 689 | return -EINVAL; |
| 690 | } |
| 691 | |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 692 | Tx = ms_class->tx; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 693 | Sum = ms_class->sum; |
| 694 | Tta = ms_class->ta; |
| 695 | Ttb = ms_class->tb; |
| 696 | Tra = ms_class->ra; |
| 697 | Trb = ms_class->rb; |
| 698 | Type = ms_class->type; |
| 699 | |
| 700 | /* Tta and Ttb may depend on hopping or frequency change */ |
Holger Hans Peter Freyther | f34f344 | 2013-12-25 20:33:37 +0100 | [diff] [blame] | 701 | if (Ttb == MS_A || Ttb == MS_B) |
Holger Hans Peter Freyther | 11a7489 | 2013-09-29 08:13:42 +0200 | [diff] [blame] | 702 | Ttb = 0; |
Holger Hans Peter Freyther | f34f344 | 2013-12-25 20:33:37 +0100 | [diff] [blame] | 703 | if (Trb == MS_A || Trb == MS_C) |
Holger Hans Peter Freyther | 11a7489 | 2013-09-29 08:13:42 +0200 | [diff] [blame] | 704 | Trb = 0; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 705 | |
| 706 | LOGP(DRLCMAC, LOGL_DEBUG, "- Rx=%d Tx=%d Sum Rx+Tx=%s Tta=%s Ttb=%d " |
Holger Hans Peter Freyther | 882fc9b | 2013-12-25 20:34:26 +0100 | [diff] [blame] | 707 | " Tra=%d Trb=%d Type=%d\n", ms_class->rx, Tx, |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 708 | (Sum == MS_NA) ? "N/A" : digit[Sum], |
| 709 | (Tta == MS_NA) ? "N/A" : digit[Tta], Ttb, Tra, Trb, Type); |
| 710 | |
| 711 | /* select the values for time contraints */ |
Holger Hans Peter Freyther | 11a7489 | 2013-09-29 08:13:42 +0200 | [diff] [blame] | 712 | /* applicable to type 1 and type 2 */ |
| 713 | Tt = Ttb; |
| 714 | Tr = Trb; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 715 | |
Holger Hans Peter Freyther | 882fc9b | 2013-12-25 20:34:26 +0100 | [diff] [blame] | 716 | uint8_t rx_win_min, rx_win_max; |
| 717 | rx_window = select_dl_slots(tbf->trx, ms_class->type, ms_class->rx, |
| 718 | &rx_win_min, &rx_win_max); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 719 | |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 720 | |
| 721 | /* reduce window, if existing uplink slots collide RX window */ |
Jacob Erlbeck | e2e004e | 2015-06-18 17:16:26 +0200 | [diff] [blame] | 722 | int rc = reduce_rx_window(ms_class->type, ms, Tt, Tr, |
Holger Hans Peter Freyther | e45c19b | 2013-12-25 20:53:53 +0100 | [diff] [blame] | 723 | &rx_window, &rx_win_min, &rx_win_max); |
| 724 | if (rc < 0) |
| 725 | return rc; |
Andreas Eversberg | 1cd9d88 | 2014-01-04 15:42:38 +0100 | [diff] [blame] | 726 | shrink_rx_window(&rx_win_min, &rx_win_max, rx_window); |
Holger Hans Peter Freyther | dd4af80 | 2013-12-25 21:03:42 +0100 | [diff] [blame] | 727 | rx_win_max = update_rx_win_max(ms_class->type, Tt, Tr, |
| 728 | rx_win_min, rx_win_max); |
Andreas Eversberg | 1cd9d88 | 2014-01-04 15:42:38 +0100 | [diff] [blame] | 729 | shrink_rx_window(&rx_win_min, &rx_win_max, rx_window); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 730 | LOGP(DRLCMAC, LOGL_DEBUG, "- RX-Window is: %d..%d\n", rx_win_min, |
| 731 | rx_win_max); |
| 732 | |
| 733 | /* calculate TX window */ |
Holger Hans Peter Freyther | 3fd2ddf | 2013-12-25 21:11:20 +0100 | [diff] [blame] | 734 | uint8_t tx_win_min, tx_win_max, tx_range; |
| 735 | tx_win_from_rx(ms_class->type, rx_win_min, rx_win_max, Tt, Tr, |
| 736 | &tx_win_min, &tx_win_max, &tx_range); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 737 | |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 738 | /* select UL slots but in both cases assign first_common_ts */ |
| 739 | uint8_t tx_window = 0; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 740 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 741 | rc = select_ul_slots(tbf->trx, ms_class->type, ms_class->tx, |
Andreas Eversberg | 765736d | 2014-01-04 15:27:31 +0100 | [diff] [blame] | 742 | tx_win_min, tx_range, usf, |
| 743 | &first_common_ts, rx_window); |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 744 | if (rc < 0) |
| 745 | return rc; |
| 746 | tx_window = rc; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 747 | } else { |
Andreas Eversberg | 765736d | 2014-01-04 15:27:31 +0100 | [diff] [blame] | 748 | first_common_ts = select_first_ts(tbf->trx, tx_win_min, |
| 749 | tx_range, rx_window); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 750 | } |
Holger Hans Peter Freyther | 7319311 | 2013-12-26 09:49:05 +0100 | [diff] [blame] | 751 | #warning "first_common_ts might be different if there was no free USF for the new uplink assignment" |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 752 | |
| 753 | if (first_common_ts < 0) { |
| 754 | LOGP(DRLCMAC, LOGL_NOTICE, "No first common slots available\n"); |
| 755 | return -EINVAL; |
| 756 | } |
| 757 | |
| 758 | if (tbf->direction == GPRS_RLCMAC_DL_TBF) { |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 759 | struct gprs_rlcmac_dl_tbf *dl_tbf = static_cast<gprs_rlcmac_dl_tbf *>(tbf); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 760 | /* assign downlink */ |
| 761 | if (rx_window == 0) { |
| 762 | LOGP(DRLCMAC, LOGL_NOTICE, "No downlink slots " |
| 763 | "available\n"); |
| 764 | return -EINVAL; |
| 765 | } |
| 766 | for (ts = 0; ts < 8; ts++) { |
| 767 | if ((rx_window & (1 << ts))) { |
| 768 | /* be sure to select a single downlink slots |
| 769 | * that can be used for uplink, if multiple |
| 770 | * slots are assigned later. */ |
| 771 | if (single && first_common_ts != ts) |
| 772 | continue; |
| 773 | LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning DL TS " |
| 774 | "%d\n", ts); |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 775 | assign_dlink_tbf(&tbf->trx->pdch[ts], dl_tbf); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 776 | slotcount++; |
| 777 | if (slotcount == 1) |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 778 | dl_tbf->first_ts = ts; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 779 | if (single) |
| 780 | break; |
| 781 | } |
| 782 | } |
| 783 | } else { |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 784 | struct gprs_rlcmac_ul_tbf *ul_tbf = static_cast<gprs_rlcmac_ul_tbf *>(tbf); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 785 | for (ts = 0; ts < 8; ts++) { |
| 786 | if ((tx_window & (1 << ts))) { |
| 787 | LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning UL TS " |
| 788 | "%d\n", ts); |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 789 | assign_uplink_tbf_usf(&tbf->trx->pdch[ts], ul_tbf, usf[ts]); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 790 | slotcount++; |
| 791 | if (slotcount == 1) |
Daniel Willmann | cd44ec4 | 2014-08-07 15:04:57 +0200 | [diff] [blame] | 792 | ul_tbf->first_ts = ts; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 793 | if (single) |
| 794 | break; |
| 795 | } |
| 796 | } |
| 797 | } |
| 798 | if (single && slotcount) { |
Daniel Willmann | cf1fae7 | 2014-05-30 17:58:01 +0200 | [diff] [blame] | 799 | uint8_t ts_count = 0; |
| 800 | for (ts = 0; ts < 8; ts++) |
| 801 | if ((tx_window & (1 << ts))) |
| 802 | ts_count++; |
| 803 | |
| 804 | tbf->upgrade_to_multislot = (ts_count > 1); |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 805 | LOGP(DRLCMAC, LOGL_INFO, "Using single slot at TS %d for %s\n", |
| 806 | tbf->first_ts, |
| 807 | (tbf->direction == GPRS_RLCMAC_DL_TBF) ? "DL" : "UL"); |
| 808 | } else { |
Daniel Willmann | cf1fae7 | 2014-05-30 17:58:01 +0200 | [diff] [blame] | 809 | tbf->upgrade_to_multislot = 0; |
Holger Hans Peter Freyther | 02ab4a8 | 2013-09-29 07:37:40 +0200 | [diff] [blame] | 810 | LOGP(DRLCMAC, LOGL_INFO, "Using %d slots for %s\n", slotcount, |
| 811 | (tbf->direction == GPRS_RLCMAC_DL_TBF) ? "DL" : "UL"); |
| 812 | } |
| 813 | if (slotcount == 0) |
| 814 | return -EBUSY; |
| 815 | |
| 816 | tbf->first_common_ts = first_common_ts; |
| 817 | |
| 818 | return 0; |
| 819 | } |