Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 1 | /* Copied from gprs_bssgp_pcu.cpp |
| 2 | * |
| 3 | * Copyright (C) 2012 Ivan Klyuchnikov |
Holger Hans Peter Freyther | 8692128 | 2013-08-24 21:26:42 +0200 | [diff] [blame] | 4 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 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 | |
Holger Hans Peter Freyther | 67ed34e | 2013-10-17 17:01:54 +0200 | [diff] [blame] | 22 | #include <bts.h> |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 23 | #include <tbf.h> |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 24 | #include <rlc.h> |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 25 | #include <gprs_rlcmac.h> |
| 26 | #include <gprs_debug.h> |
| 27 | |
| 28 | extern "C" { |
| 29 | #include <osmocom/core/msgb.h> |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 30 | #include <osmocom/core/talloc.h> |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 31 | } |
| 32 | |
| 33 | #include <errno.h> |
| 34 | #include <string.h> |
| 35 | |
Holger Hans Peter Freyther | 1702f10 | 2013-10-20 08:44:02 +0200 | [diff] [blame] | 36 | extern "C" { |
| 37 | int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, |
| 38 | uint8_t num_frames, uint32_t num_octets); |
| 39 | } |
| 40 | |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 41 | extern void *tall_pcu_ctx; |
| 42 | |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 43 | static void tbf_timer_cb(void *_tbf); |
| 44 | |
Holger Hans Peter Freyther | d1d114f | 2013-08-24 20:46:18 +0200 | [diff] [blame] | 45 | static inline void tbf_update_ms_class(struct gprs_rlcmac_tbf *tbf, |
| 46 | const uint8_t ms_class) |
| 47 | { |
| 48 | if (!tbf->ms_class && ms_class) |
| 49 | tbf->ms_class = ms_class; |
| 50 | } |
| 51 | |
Holger Hans Peter Freyther | d868928 | 2013-08-24 20:51:06 +0200 | [diff] [blame] | 52 | static inline void tbf_assign_imsi(struct gprs_rlcmac_tbf *tbf, |
| 53 | const char *imsi) |
| 54 | { |
| 55 | strncpy(tbf->meas.imsi, imsi, sizeof(tbf->meas.imsi) - 1); |
| 56 | } |
| 57 | |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 58 | static struct gprs_rlcmac_tbf *tbf_lookup_dl(BTS *bts, |
| 59 | const uint32_t tlli, const char *imsi) |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 60 | { |
| 61 | /* TODO: look up by IMSI first, then tlli, then old_tlli */ |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 62 | return bts->tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF); |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 63 | } |
| 64 | |
| 65 | static int tbf_append_data(struct gprs_rlcmac_tbf *tbf, |
| 66 | struct gprs_rlcmac_bts *bts, |
| 67 | const uint8_t ms_class, |
| 68 | const uint16_t pdu_delay_csec, |
| 69 | const uint8_t *data, const uint16_t len) |
| 70 | { |
| 71 | LOGP(DRLCMAC, LOGL_INFO, "TBF: APPEND TFI: %u TLLI: 0x%08x\n", tbf->tfi, tbf->tlli); |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 72 | if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE)) { |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 73 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF in WAIT RELEASE state " |
| 74 | "(T3193), so reuse TBF\n"); |
| 75 | memcpy(tbf->llc_frame, data, len); |
| 76 | tbf->llc_length = len; |
| 77 | /* reset rlc states */ |
| 78 | memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); |
| 79 | /* keep to flags */ |
| 80 | tbf->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; |
| 81 | tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
Holger Hans Peter Freyther | d1d114f | 2013-08-24 20:46:18 +0200 | [diff] [blame] | 82 | tbf_update_ms_class(tbf, ms_class); |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 83 | tbf->update(); |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 84 | gprs_rlcmac_trigger_downlink_assignment(tbf, tbf, NULL); |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 85 | } else { |
| 86 | /* the TBF exists, so we must write it in the queue |
| 87 | * we prepend lifetime in front of PDU */ |
| 88 | struct timeval *tv; |
| 89 | struct msgb *llc_msg = msgb_alloc(len + sizeof(*tv), |
| 90 | "llc_pdu_queue"); |
| 91 | if (!llc_msg) |
| 92 | return -ENOMEM; |
| 93 | tv = (struct timeval *)msgb_put(llc_msg, sizeof(*tv)); |
| 94 | |
| 95 | uint16_t delay_csec; |
| 96 | if (bts->force_llc_lifetime) |
| 97 | delay_csec = bts->force_llc_lifetime; |
| 98 | else |
| 99 | delay_csec = pdu_delay_csec; |
| 100 | /* keep timestap at 0 for infinite delay */ |
| 101 | if (delay_csec != 0xffff) { |
| 102 | /* calculate timestamp of timeout */ |
| 103 | gettimeofday(tv, NULL); |
| 104 | tv->tv_usec += (delay_csec % 100) * 10000; |
| 105 | tv->tv_sec += delay_csec / 100; |
| 106 | if (tv->tv_usec > 999999) { |
| 107 | tv->tv_usec -= 1000000; |
| 108 | tv->tv_sec++; |
| 109 | } |
| 110 | } |
| 111 | memcpy(msgb_put(llc_msg, len), data, len); |
| 112 | msgb_enqueue(&tbf->llc_queue, llc_msg); |
Holger Hans Peter Freyther | d1d114f | 2013-08-24 20:46:18 +0200 | [diff] [blame] | 113 | tbf_update_ms_class(tbf, ms_class); |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | return 0; |
| 117 | } |
| 118 | |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 119 | static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts, |
| 120 | const char *imsi, |
| 121 | const uint32_t tlli, const uint8_t ms_class, |
| 122 | const uint8_t *data, const uint16_t len) |
| 123 | { |
| 124 | uint8_t trx, ta, ss; |
| 125 | int8_t use_trx; |
| 126 | struct gprs_rlcmac_tbf *old_tbf, *tbf; |
| 127 | int8_t tfi; /* must be signed */ |
| 128 | int rc; |
| 129 | |
| 130 | /* check for uplink data, so we copy our informations */ |
Holger Hans Peter Freyther | bb20b2c | 2013-08-24 21:22:16 +0200 | [diff] [blame] | 131 | #warning "Do the same look up for IMSI, TLLI and OLD_TLLI" |
| 132 | #warning "Refactor the below lines... into a new method" |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 133 | tbf = bts->bts->tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 134 | if (tbf && tbf->dir.ul.contention_resolution_done |
| 135 | && !tbf->dir.ul.final_ack_sent) { |
Holger Hans Peter Freyther | 96efa70 | 2013-09-29 07:44:39 +0200 | [diff] [blame] | 136 | use_trx = tbf->trx_no; |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 137 | ta = tbf->ta; |
| 138 | ss = 0; |
| 139 | old_tbf = tbf; |
| 140 | } else { |
| 141 | use_trx = -1; |
| 142 | /* we already have an uplink TBF, so we use that TA */ |
| 143 | if (tbf) |
| 144 | ta = tbf->ta; |
| 145 | else { |
| 146 | /* recall TA */ |
Holger Hans Peter Freyther | 111614a | 2013-10-19 20:04:57 +0200 | [diff] [blame] | 147 | rc = bts->bts->timing_advance()->recall(tlli); |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 148 | if (rc < 0) { |
| 149 | LOGP(DRLCMAC, LOGL_NOTICE, "TA unknown" |
| 150 | ", assuming 0\n"); |
| 151 | ta = 0; |
| 152 | } else |
| 153 | ta = rc; |
| 154 | } |
| 155 | ss = 1; /* PCH assignment only allows one timeslot */ |
| 156 | old_tbf = NULL; |
| 157 | } |
| 158 | |
| 159 | // Create new TBF (any TRX) |
Holger Hans Peter Freyther | bcafdf8 | 2013-08-24 21:13:31 +0200 | [diff] [blame] | 160 | #warning "Copy and paste with alloc_ul_tbf" |
Holger Hans Peter Freyther | 70ddde6 | 2013-10-26 19:17:58 +0200 | [diff] [blame] | 161 | tfi = bts->bts->tfi_find_free(GPRS_RLCMAC_DL_TBF, &trx, use_trx); |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 162 | if (tfi < 0) { |
| 163 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
| 164 | /* FIXME: send reject */ |
| 165 | return -EBUSY; |
| 166 | } |
| 167 | /* set number of downlink slots according to multislot class */ |
| 168 | tbf = tbf_alloc(bts, tbf, GPRS_RLCMAC_DL_TBF, tfi, trx, ms_class, ss); |
| 169 | if (!tbf) { |
| 170 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 171 | /* FIXME: send reject */ |
| 172 | return -EBUSY; |
| 173 | } |
| 174 | tbf->tlli = tlli; |
| 175 | tbf->tlli_valid = 1; |
| 176 | tbf->ta = ta; |
| 177 | |
| 178 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 179 | "TBF: [DOWNLINK] START TFI: %d TLLI: 0x%08x \n", |
| 180 | tbf->tfi, tbf->tlli); |
| 181 | |
| 182 | /* new TBF, so put first frame */ |
| 183 | memcpy(tbf->llc_frame, data, len); |
| 184 | tbf->llc_length = len; |
| 185 | |
| 186 | /* trigger downlink assignment and set state to ASSIGN. |
| 187 | * we don't use old_downlink, so the possible uplink is used |
| 188 | * to trigger downlink assignment. if there is no uplink, |
| 189 | * AGCH is used. */ |
Holger Hans Peter Freyther | b65e08a | 2013-10-20 17:10:25 +0200 | [diff] [blame] | 190 | gprs_rlcmac_trigger_downlink_assignment(tbf, old_tbf, imsi); |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 191 | |
| 192 | /* store IMSI for debugging purpose. TODO: it is more than debugging */ |
| 193 | tbf_assign_imsi(tbf, imsi); |
| 194 | return 0; |
| 195 | } |
| 196 | |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 197 | /** |
| 198 | * TODO: split into unit test-able parts... |
| 199 | */ |
| 200 | int tbf_handle(struct gprs_rlcmac_bts *bts, |
| 201 | const uint32_t tlli, const char *imsi, |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 202 | const uint8_t ms_class, const uint16_t delay_csec, |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 203 | const uint8_t *data, const uint16_t len) |
| 204 | { |
| 205 | struct gprs_rlcmac_tbf *tbf; |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 206 | |
| 207 | /* check for existing TBF */ |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 208 | tbf = tbf_lookup_dl(bts->bts, tlli, imsi); |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 209 | if (tbf) { |
| 210 | int rc = tbf_append_data(tbf, bts, ms_class, |
| 211 | delay_csec, data, len); |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 212 | if (rc >= 0) |
| 213 | tbf_assign_imsi(tbf, imsi); |
| 214 | return rc; |
| 215 | } |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 216 | |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 217 | return tbf_new_dl_assignment(bts, imsi, tlli, ms_class, data, len); |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 218 | } |
Holger Hans Peter Freyther | 8692128 | 2013-08-24 21:26:42 +0200 | [diff] [blame] | 219 | |
| 220 | struct gprs_rlcmac_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts, |
| 221 | int8_t use_trx, uint8_t ms_class, |
| 222 | uint32_t tlli, uint8_t ta, struct gprs_rlcmac_tbf *dl_tbf) |
| 223 | { |
| 224 | uint8_t trx; |
| 225 | struct gprs_rlcmac_tbf *tbf; |
| 226 | uint8_t tfi; |
| 227 | |
| 228 | #warning "Copy and paste with tbf_new_dl_assignment" |
| 229 | /* create new TBF, use sme TRX as DL TBF */ |
Holger Hans Peter Freyther | 70ddde6 | 2013-10-26 19:17:58 +0200 | [diff] [blame] | 230 | tfi = bts->bts->tfi_find_free(GPRS_RLCMAC_UL_TBF, &trx, use_trx); |
Holger Hans Peter Freyther | 8692128 | 2013-08-24 21:26:42 +0200 | [diff] [blame] | 231 | if (tfi < 0) { |
| 232 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 233 | /* FIXME: send reject */ |
| 234 | return NULL; |
| 235 | } |
| 236 | /* use multislot class of downlink TBF */ |
| 237 | tbf = tbf_alloc(bts, dl_tbf, GPRS_RLCMAC_UL_TBF, tfi, trx, ms_class, 0); |
| 238 | if (!tbf) { |
| 239 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| 240 | /* FIXME: send reject */ |
| 241 | return NULL; |
| 242 | } |
| 243 | tbf->tlli = tlli; |
| 244 | tbf->tlli_valid = 1; /* no contention resolution */ |
| 245 | tbf->dir.ul.contention_resolution_done = 1; |
| 246 | tbf->ta = ta; /* use current TA */ |
| 247 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
| 248 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH); |
| 249 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
| 250 | |
| 251 | return tbf; |
| 252 | } |
Holger Hans Peter Freyther | 964ddb6 | 2013-10-16 17:53:23 +0200 | [diff] [blame] | 253 | |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 254 | static void tbf_unlink_pdch(struct gprs_rlcmac_tbf *tbf) |
| 255 | { |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 256 | struct gprs_rlcmac_pdch *pdch; |
| 257 | int ts; |
| 258 | |
| 259 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
Holger Hans Peter Freyther | 173a240 | 2013-10-16 21:47:45 +0200 | [diff] [blame] | 260 | tbf->trx->ul_tbf[tbf->tfi] = NULL; |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 261 | for (ts = 0; ts < 8; ts++) { |
| 262 | pdch = tbf->pdch[ts]; |
| 263 | if (pdch) |
| 264 | pdch->ul_tbf[tbf->tfi] = NULL; |
| 265 | tbf->pdch[ts] = NULL; |
| 266 | } |
| 267 | } else { |
Holger Hans Peter Freyther | 173a240 | 2013-10-16 21:47:45 +0200 | [diff] [blame] | 268 | tbf->trx->dl_tbf[tbf->tfi] = NULL; |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 269 | for (ts = 0; ts < 8; ts++) { |
| 270 | pdch = tbf->pdch[ts]; |
| 271 | if (pdch) |
| 272 | pdch->dl_tbf[tbf->tfi] = NULL; |
| 273 | tbf->pdch[ts] = NULL; |
| 274 | } |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | void tbf_free(struct gprs_rlcmac_tbf *tbf) |
| 279 | { |
| 280 | struct msgb *msg; |
| 281 | |
| 282 | /* Give final measurement report */ |
| 283 | gprs_rlcmac_rssi_rep(tbf); |
| 284 | gprs_rlcmac_lost_rep(tbf); |
| 285 | |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 286 | debug_diagram(tbf->bts, tbf->diag, "+---------------+"); |
| 287 | debug_diagram(tbf->bts, tbf->diag, "| THE END |"); |
| 288 | debug_diagram(tbf->bts, tbf->diag, "+---------------+"); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 289 | LOGP(DRLCMAC, LOGL_INFO, "Free %s TBF=%d with TLLI=0x%08x.\n", |
| 290 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, |
| 291 | tbf->tlli); |
| 292 | if (tbf->ul_ass_state != GPRS_RLCMAC_UL_ASS_NONE) |
| 293 | LOGP(DRLCMAC, LOGL_ERROR, "Software error: Pending uplink " |
| 294 | "assignment. This may not happen, because the " |
| 295 | "assignment message never gets transmitted. Please " |
Holger Hans Peter Freyther | 6673005 | 2013-10-26 18:32:13 +0200 | [diff] [blame] | 296 | "be sure not to free in this state. PLEASE FIX!\n"); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 297 | if (tbf->dl_ass_state != GPRS_RLCMAC_DL_ASS_NONE) |
| 298 | LOGP(DRLCMAC, LOGL_ERROR, "Software error: Pending downlink " |
| 299 | "assignment. This may not happen, because the " |
| 300 | "assignment message never gets transmitted. Please " |
Holger Hans Peter Freyther | 6673005 | 2013-10-26 18:32:13 +0200 | [diff] [blame] | 301 | "be sure not to free in this state. PLEASE FIX!\n"); |
Holger Hans Peter Freyther | 86300bb | 2013-10-26 18:01:35 +0200 | [diff] [blame] | 302 | tbf->stop_timer(); |
Holger Hans Peter Freyther | 782f6dd | 2013-10-26 18:31:51 +0200 | [diff] [blame] | 303 | #warning "TODO: Could/Should generate bssgp_tx_llc_discarded" |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 304 | while ((msg = msgb_dequeue(&tbf->llc_queue))) |
| 305 | msgb_free(msg); |
| 306 | tbf_unlink_pdch(tbf); |
| 307 | llist_del(&tbf->list); |
| 308 | LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF ends here **********\n"); |
| 309 | talloc_free(tbf); |
| 310 | } |
| 311 | |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 312 | int gprs_rlcmac_tbf::update() |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 313 | { |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 314 | struct gprs_rlcmac_tbf *ul_tbf = NULL; |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 315 | struct gprs_rlcmac_bts *bts_data = bts->bts_data(); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 316 | int rc; |
| 317 | |
| 318 | LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF update **********\n"); |
| 319 | |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 320 | if (direction != GPRS_RLCMAC_DL_TBF) |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 321 | return -EINVAL; |
| 322 | |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 323 | if (!ms_class) { |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 324 | LOGP(DRLCMAC, LOGL_DEBUG, "- Cannot update, no class\n"); |
| 325 | return -EINVAL; |
| 326 | } |
| 327 | |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 328 | ul_tbf = bts->tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 329 | |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 330 | tbf_unlink_pdch(this); |
| 331 | rc = bts_data->alloc_algorithm(bts_data, ul_tbf, this, bts_data->alloc_algorithm_curst, 0); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 332 | /* if no ressource */ |
| 333 | if (rc < 0) { |
| 334 | LOGP(DRLCMAC, LOGL_ERROR, "No ressource after update???\n"); |
| 335 | return -rc; |
| 336 | } |
| 337 | |
| 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | int tbf_assign_control_ts(struct gprs_rlcmac_tbf *tbf) |
| 342 | { |
| 343 | if (tbf->control_ts == 0xff) |
| 344 | LOGP(DRLCMAC, LOGL_INFO, "- Setting Control TS %d\n", |
| 345 | tbf->first_common_ts); |
| 346 | else if (tbf->control_ts != tbf->first_common_ts) |
| 347 | LOGP(DRLCMAC, LOGL_INFO, "- Changing Control TS %d\n", |
| 348 | tbf->first_common_ts); |
| 349 | tbf->control_ts = tbf->first_common_ts; |
| 350 | |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | static const char *tbf_state_name[] = { |
| 355 | "NULL", |
| 356 | "ASSIGN", |
| 357 | "FLOW", |
| 358 | "FINISHED", |
| 359 | "WAIT RELEASE", |
| 360 | "RELEASING", |
| 361 | }; |
| 362 | |
| 363 | void tbf_new_state(struct gprs_rlcmac_tbf *tbf, |
| 364 | enum gprs_rlcmac_tbf_state state) |
| 365 | { |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 366 | debug_diagram(tbf->bts, tbf->diag, "->%s", tbf_state_name[state]); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 367 | LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d changes state from %s to %s\n", |
| 368 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, |
| 369 | tbf_state_name[tbf->state], tbf_state_name[state]); |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 370 | tbf->set_state(state); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T, |
| 374 | unsigned int seconds, unsigned int microseconds) |
| 375 | { |
| 376 | if (!osmo_timer_pending(&tbf->timer)) |
| 377 | LOGP(DRLCMAC, LOGL_DEBUG, "Starting %s TBF=%d timer %u.\n", |
| 378 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", |
| 379 | tbf->tfi, T); |
| 380 | else |
| 381 | LOGP(DRLCMAC, LOGL_DEBUG, "Restarting %s TBF=%d timer %u " |
| 382 | "while old timer %u pending \n", |
| 383 | (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", |
| 384 | tbf->tfi, T, tbf->T); |
| 385 | |
| 386 | tbf->T = T; |
| 387 | tbf->num_T_exp = 0; |
| 388 | |
| 389 | /* Tunning timers can be safely re-scheduled. */ |
| 390 | tbf->timer.data = tbf; |
| 391 | tbf->timer.cb = &tbf_timer_cb; |
| 392 | |
| 393 | osmo_timer_schedule(&tbf->timer, seconds, microseconds); |
| 394 | } |
| 395 | |
Holger Hans Peter Freyther | 86300bb | 2013-10-26 18:01:35 +0200 | [diff] [blame] | 396 | void gprs_rlcmac_tbf::stop_t3191() |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 397 | { |
Holger Hans Peter Freyther | 86300bb | 2013-10-26 18:01:35 +0200 | [diff] [blame] | 398 | return stop_timer(); |
| 399 | } |
| 400 | |
| 401 | void gprs_rlcmac_tbf::stop_timer() |
| 402 | { |
| 403 | if (osmo_timer_pending(&timer)) { |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 404 | LOGP(DRLCMAC, LOGL_DEBUG, "Stopping %s TBF=%d timer %u.\n", |
Holger Hans Peter Freyther | 86300bb | 2013-10-26 18:01:35 +0200 | [diff] [blame] | 405 | (direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tfi, T); |
| 406 | osmo_timer_del(&timer); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 407 | } |
| 408 | } |
| 409 | |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 410 | struct gprs_rlcmac_tbf *tbf_alloc(struct gprs_rlcmac_bts *bts, |
| 411 | struct gprs_rlcmac_tbf *old_tbf, enum gprs_rlcmac_tbf_direction dir, |
| 412 | uint8_t tfi, uint8_t trx, |
| 413 | uint8_t ms_class, uint8_t single_slot) |
| 414 | { |
| 415 | struct gprs_rlcmac_tbf *tbf; |
| 416 | int rc; |
| 417 | |
| 418 | #ifdef DEBUG_DIAGRAM |
| 419 | /* hunt for first free number in diagram */ |
| 420 | int diagram_num; |
| 421 | for (diagram_num = 0; ; diagram_num++) { |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 422 | llist_for_each_entry(tbf, &bts->ul_tbfs, list) { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 423 | if (tbf->diag == diagram_num) |
| 424 | goto next_diagram; |
| 425 | } |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 426 | llist_for_each_entry(tbf, &bts->dl_tbfs, list) { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 427 | if (tbf->diag == diagram_num) |
| 428 | goto next_diagram; |
| 429 | } |
| 430 | break; |
| 431 | next_diagram: |
| 432 | continue; |
| 433 | } |
| 434 | #endif |
| 435 | |
| 436 | LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF starts here **********\n"); |
| 437 | LOGP(DRLCMAC, LOGL_INFO, "Allocating %s TBF: TFI=%d TRX=%d " |
| 438 | "MS_CLASS=%d\n", (dir == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", |
| 439 | tfi, trx, ms_class); |
| 440 | |
| 441 | if (trx >= 8 || tfi >= 32) |
| 442 | return NULL; |
| 443 | |
| 444 | tbf = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_tbf); |
| 445 | if (!tbf) |
| 446 | return NULL; |
| 447 | |
Holger Hans Peter Freyther | 9f0c1d2 | 2013-10-19 21:24:34 +0200 | [diff] [blame] | 448 | tbf->bts = bts->bts; |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 449 | #ifdef DEBUG_DIAGRAM |
| 450 | tbf->diag = diagram_num; |
| 451 | #endif |
| 452 | tbf->direction = dir; |
| 453 | tbf->tfi = tfi; |
Holger Hans Peter Freyther | 96efa70 | 2013-09-29 07:44:39 +0200 | [diff] [blame] | 454 | tbf->trx_no = trx; |
Holger Hans Peter Freyther | 743bafa | 2013-09-29 07:50:50 +0200 | [diff] [blame] | 455 | tbf->trx = &bts->trx[trx]; |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 456 | tbf->arfcn = bts->trx[trx].arfcn; |
| 457 | tbf->ms_class = ms_class; |
| 458 | tbf->ws = 64; |
| 459 | tbf->sns = 128; |
| 460 | /* select algorithm */ |
| 461 | rc = bts->alloc_algorithm(bts, old_tbf, tbf, bts->alloc_algorithm_curst, |
| 462 | single_slot); |
| 463 | /* if no ressource */ |
| 464 | if (rc < 0) { |
| 465 | talloc_free(tbf); |
| 466 | return NULL; |
| 467 | } |
| 468 | /* assign control ts */ |
| 469 | tbf->control_ts = 0xff; |
| 470 | rc = tbf_assign_control_ts(tbf); |
| 471 | /* if no ressource */ |
| 472 | if (rc < 0) { |
| 473 | talloc_free(tbf); |
| 474 | return NULL; |
| 475 | } |
| 476 | |
| 477 | /* set timestamp */ |
| 478 | gettimeofday(&tbf->meas.dl_bw_tv, NULL); |
| 479 | gettimeofday(&tbf->meas.rssi_tv, NULL); |
| 480 | gettimeofday(&tbf->meas.dl_loss_tv, NULL); |
| 481 | |
| 482 | INIT_LLIST_HEAD(&tbf->llc_queue); |
| 483 | if (dir == GPRS_RLCMAC_UL_TBF) |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 484 | llist_add(&tbf->list, &bts->ul_tbfs); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 485 | else |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 486 | llist_add(&tbf->list, &bts->dl_tbfs); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 487 | |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 488 | debug_diagram(bts->bts, tbf->diag, "+-----------------+"); |
| 489 | debug_diagram(bts->bts, tbf->diag, "|NEW %s TBF TFI=%2d|", |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 490 | (dir == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tfi); |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 491 | debug_diagram(bts->bts, tbf->diag, "+-----------------+"); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 492 | |
| 493 | return tbf; |
| 494 | } |
| 495 | |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 496 | static void tbf_timer_cb(void *_tbf) |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 497 | { |
| 498 | struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf; |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 499 | tbf->handle_timeout(); |
| 500 | } |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 501 | |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 502 | void gprs_rlcmac_tbf::handle_timeout() |
| 503 | { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 504 | LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d timer %u expired.\n", |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 505 | (direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tfi, T); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 506 | |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 507 | num_T_exp++; |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 508 | |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 509 | switch (T) { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 510 | #ifdef DEBUG_DL_ASS_IDLE |
| 511 | case 1234: |
| 512 | gprs_rlcmac_trigger_downlink_assignment(tbf, NULL, debug_imsi); |
| 513 | break; |
| 514 | #endif |
| 515 | case 0: /* assignment */ |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 516 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) { |
| 517 | if (state_is(GPRS_RLCMAC_ASSIGN)) { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 518 | LOGP(DRLCMAC, LOGL_NOTICE, "Releasing due to " |
| 519 | "PACCH assignment timeout.\n"); |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 520 | tbf_free(this); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 521 | } else |
| 522 | LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not " |
| 523 | "in assign state\n"); |
| 524 | } |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 525 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 526 | /* change state to FLOW, so scheduler will start transmission */ |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 527 | dir.dl.wait_confirm = 0; |
| 528 | if (state_is(GPRS_RLCMAC_ASSIGN)) { |
| 529 | tbf_new_state(this, GPRS_RLCMAC_FLOW); |
| 530 | tbf_assign_control_ts(this); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 531 | } else |
| 532 | LOGP(DRLCMAC, LOGL_NOTICE, "Continue flow after " |
| 533 | "IMM.ASS confirm\n"); |
| 534 | } |
| 535 | break; |
| 536 | case 3169: |
| 537 | case 3191: |
| 538 | case 3195: |
| 539 | LOGP(DRLCMAC, LOGL_NOTICE, "TBF T%d timeout during " |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 540 | "transsmission\n", T); |
| 541 | rlcmac_diag(); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 542 | /* fall through */ |
| 543 | case 3193: |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 544 | if (T == 3193) |
| 545 | debug_diagram(bts, diag, "T3193 timeout"); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 546 | LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n"); |
| 547 | /* free TBF */ |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 548 | tbf_free(this); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 549 | break; |
| 550 | default: |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 551 | LOGP(DRLCMAC, LOGL_ERROR, "Timer expired in unknown mode: %u\n", T); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 552 | } |
| 553 | } |
| 554 | |
| 555 | int gprs_rlcmac_tbf::rlcmac_diag() |
| 556 | { |
| 557 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) |
| 558 | LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on CCCH\n"); |
| 559 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) |
| 560 | LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on PACCH\n"); |
| 561 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_UL_DATA))) |
| 562 | LOGP(DRLCMAC, LOGL_NOTICE, "- Uplink data was received\n"); |
| 563 | else if (direction == GPRS_RLCMAC_UL_TBF) |
| 564 | LOGP(DRLCMAC, LOGL_NOTICE, "- No uplink data received yet\n"); |
| 565 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) |
| 566 | LOGP(DRLCMAC, LOGL_NOTICE, "- Downlink ACK was received\n"); |
| 567 | else if (direction == GPRS_RLCMAC_DL_TBF) |
| 568 | LOGP(DRLCMAC, LOGL_NOTICE, "- No downlink ACK received yet\n"); |
| 569 | |
| 570 | return 0; |
| 571 | } |
| 572 | |
Holger Hans Peter Freyther | 1702f10 | 2013-10-20 08:44:02 +0200 | [diff] [blame] | 573 | struct msgb *gprs_rlcmac_tbf::llc_dequeue(bssgp_bvc_ctx *bctx) |
| 574 | { |
| 575 | struct msgb *msg; |
| 576 | struct timeval *tv, tv_now; |
| 577 | uint32_t octets = 0, frames = 0; |
| 578 | |
| 579 | gettimeofday(&tv_now, NULL); |
| 580 | |
| 581 | while ((msg = msgb_dequeue(&llc_queue))) { |
| 582 | tv = (struct timeval *)msg->data; |
| 583 | msgb_pull(msg, sizeof(*tv)); |
| 584 | if (tv->tv_sec /* not infinite */ |
| 585 | && (tv_now.tv_sec > tv->tv_sec /* and secs expired */ |
| 586 | || (tv_now.tv_sec == tv->tv_sec /* .. or if secs equal .. */ |
| 587 | && tv_now.tv_usec > tv->tv_usec))) { /* .. usecs expired */ |
| 588 | LOGP(DRLCMACDL, LOGL_NOTICE, "Discarding LLC PDU of " |
| 589 | "DL TBF=%d, because lifetime limit reached\n", |
| 590 | tfi); |
| 591 | frames++; |
| 592 | octets += msg->len; |
| 593 | msgb_free(msg); |
| 594 | continue; |
| 595 | } |
| 596 | break; |
| 597 | } |
| 598 | |
| 599 | if (frames) { |
| 600 | if (frames > 0xff) |
| 601 | frames = 0xff; |
| 602 | if (octets > 0xffffff) |
| 603 | octets = 0xffffff; |
| 604 | bssgp_tx_llc_discarded(bctx, tlli, frames, octets); |
| 605 | } |
| 606 | |
| 607 | return msg; |
| 608 | } |
| 609 | |
| 610 | void gprs_rlcmac_tbf::update_llc_frame(struct msgb *msg) |
| 611 | { |
| 612 | /* TODO: bounds check */ |
| 613 | memcpy(llc_frame, msg->data, msg->len); |
| 614 | llc_length = msg->len; |
| 615 | } |
| 616 | |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 617 | /* |
| 618 | * Store received block data in LLC message(s) and forward to SGSN |
| 619 | * if complete. |
| 620 | */ |
| 621 | int gprs_rlcmac_tbf::assemble_forward_llc(uint8_t *data, uint8_t len) |
| 622 | { |
| 623 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
| 624 | uint8_t e, m; |
| 625 | struct rlc_li_field *li; |
| 626 | uint8_t frame_offset[16], offset = 0, chunk; |
| 627 | int i, frames = 0; |
| 628 | |
| 629 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len); |
| 630 | |
| 631 | data += 3; |
| 632 | len -= 3; |
| 633 | e = rh->e; /* if extended */ |
| 634 | m = 1; /* more frames, that means: the first frame */ |
| 635 | |
| 636 | /* Parse frame offsets from length indicator(s), if any. */ |
| 637 | while (1) { |
| 638 | if (frames == (int)sizeof(frame_offset)) { |
| 639 | LOGP(DRLCMACUL, LOGL_ERROR, "Too many frames in " |
| 640 | "block\n"); |
| 641 | return -EINVAL; |
| 642 | } |
| 643 | frame_offset[frames++] = offset; |
| 644 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset " |
| 645 | "%d\n", frames, offset); |
| 646 | if (!len) |
| 647 | break; |
| 648 | /* M == 0 and E == 0 is not allowed in this version. */ |
| 649 | if (!m && !e) { |
| 650 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d " |
| 651 | "ignored, because M='0' and E='0'.\n", |
| 652 | this->tfi); |
| 653 | return 0; |
| 654 | } |
| 655 | /* no more frames in this segment */ |
| 656 | if (e) { |
| 657 | break; |
| 658 | } |
| 659 | /* There is a new frame and an LI that delimits it. */ |
| 660 | if (m) { |
| 661 | li = (struct rlc_li_field *)data; |
| 662 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n", |
| 663 | li->li); |
| 664 | /* Special case: LI == 0 |
| 665 | * If the last segment would fit precisely into the |
| 666 | * rest of the RLC MAC block, there would be no way |
| 667 | * to delimit that this segment ends and is not |
| 668 | * continued in the next block. |
| 669 | * The special LI (0) is used to force the segment to |
| 670 | * extend into the next block, so it is delimited there. |
| 671 | * This LI must be skipped. Also it is the last LI. |
| 672 | */ |
| 673 | if (li->li == 0) { |
| 674 | data++; |
| 675 | len--; |
| 676 | m = 1; /* M is ignored, we know there is more */ |
| 677 | break; /* handle E as '1', so we break! */ |
| 678 | } |
| 679 | e = li->e; |
| 680 | m = li->m; |
| 681 | offset += li->li; |
| 682 | data++; |
| 683 | len--; |
| 684 | continue; |
| 685 | } |
| 686 | } |
| 687 | if (!m) { |
| 688 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare " |
| 689 | "data\n"); |
| 690 | } |
| 691 | |
| 692 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n", |
| 693 | len); |
| 694 | /* TLLI */ |
| 695 | if (rh->ti) { |
| 696 | if (len < 4) { |
| 697 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of " |
| 698 | "frame border\n"); |
| 699 | return -EINVAL; |
| 700 | } |
| 701 | data += 4; |
| 702 | len -= 4; |
| 703 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: " |
| 704 | "%d\n", len); |
| 705 | } |
| 706 | |
| 707 | /* PFI */ |
| 708 | if (rh->pi) { |
| 709 | LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, " |
| 710 | "please disable in SYSTEM INFORMATION\n"); |
| 711 | if (len < 1) { |
| 712 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA PFI out of " |
| 713 | "frame border\n"); |
| 714 | return -EINVAL; |
| 715 | } |
| 716 | data++; |
| 717 | len--; |
| 718 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: " |
| 719 | "%d\n", len); |
| 720 | } |
| 721 | |
| 722 | /* Now we have: |
| 723 | * - a list of frames offsets: frame_offset[] |
| 724 | * - number of frames: i |
| 725 | * - m == 0: Last frame carries spare data (end of TBF). |
| 726 | */ |
| 727 | |
| 728 | /* Check if last offset would exceed frame. */ |
| 729 | if (offset > len) { |
| 730 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d ignored, " |
| 731 | "because LI delimits data that exceeds block size.\n", |
| 732 | this->tfi); |
| 733 | return -EINVAL; |
| 734 | } |
| 735 | |
| 736 | /* create LLC frames */ |
| 737 | for (i = 0; i < frames; i++) { |
| 738 | /* last frame ? */ |
| 739 | if (i == frames - 1) { |
| 740 | /* no more data in last frame */ |
| 741 | if (!m) |
| 742 | break; |
| 743 | /* data until end of frame */ |
| 744 | chunk = len - frame_offset[i]; |
| 745 | } else { |
| 746 | /* data until next frame */ |
| 747 | chunk = frame_offset[i + 1] - frame_offset[i]; |
| 748 | } |
| 749 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to " |
| 750 | "frame at %d.\n", chunk, this->llc_index); |
| 751 | if (this->llc_index + chunk > LLC_MAX_LEN) { |
| 752 | LOGP(DRLCMACUL, LOGL_NOTICE, "LLC frame exceeds " |
| 753 | "maximum size.\n"); |
| 754 | chunk = LLC_MAX_LEN - this->llc_index; |
| 755 | } |
| 756 | memcpy(this->llc_frame + this->llc_index, data + frame_offset[i], |
| 757 | chunk); |
| 758 | this->llc_index += chunk; |
| 759 | /* not last frame. */ |
| 760 | if (i != frames - 1) { |
| 761 | /* send frame to SGSN */ |
| 762 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
| 763 | "TBF=%d: len=%d\n", this->tfi, this->llc_index); |
| 764 | gprs_rlcmac_tx_ul_ud(this); |
| 765 | this->llc_index = 0; /* reset frame space */ |
| 766 | /* also check if CV==0, because the frame may fill up the |
| 767 | * block precisely, then it is also complete. normally the |
| 768 | * frame would be extended into the next block with a 0-length |
| 769 | * delimiter added to this block. */ |
| 770 | } else if (rh->cv == 0) { |
| 771 | /* send frame to SGSN */ |
| 772 | LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for " |
| 773 | "TBF=%d that fits precisely in last block: " |
| 774 | "len=%d\n", this->tfi, this->llc_index); |
| 775 | gprs_rlcmac_tx_ul_ud(this); |
| 776 | this->llc_index = 0; /* reset frame space */ |
| 777 | } |
| 778 | } |
| 779 | |
| 780 | return 0; |
| 781 | } |
| 782 | |
Holger Hans Peter Freyther | 964ddb6 | 2013-10-16 17:53:23 +0200 | [diff] [blame] | 783 | void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_trx *trx) |
| 784 | { |
| 785 | for (uint8_t tfi = 0; tfi < 32; tfi++) { |
| 786 | struct gprs_rlcmac_tbf *tbf; |
| 787 | |
| 788 | tbf = trx->ul_tbf[tfi]; |
| 789 | if (tbf) |
| 790 | tbf_free(tbf); |
| 791 | tbf = trx->dl_tbf[tfi]; |
| 792 | if (tbf) |
| 793 | tbf_free(tbf); |
| 794 | } |
| 795 | } |
Holger Hans Peter Freyther | 4f6a4e5d | 2013-10-16 17:58:46 +0200 | [diff] [blame] | 796 | |
| 797 | void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_pdch *pdch) |
| 798 | { |
| 799 | for (uint8_t tfi = 0; tfi < 32; tfi++) { |
| 800 | struct gprs_rlcmac_tbf *tbf; |
| 801 | |
| 802 | tbf = pdch->ul_tbf[tfi]; |
| 803 | if (tbf) |
| 804 | tbf_free(tbf); |
| 805 | tbf = pdch->dl_tbf[tfi]; |
| 806 | if (tbf) |
| 807 | tbf_free(tbf); |
| 808 | } |
| 809 | } |