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 | 2db7e7e | 2013-10-26 20:45:35 +0200 | [diff] [blame] | 25 | #include <encoding.h> |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 26 | #include <gprs_rlcmac.h> |
| 27 | #include <gprs_debug.h> |
Holger Hans Peter Freyther | 3dc56a3 | 2013-10-26 21:38:30 +0200 | [diff] [blame] | 28 | #include <gprs_bssgp_pcu.h> |
Holger Hans Peter Freyther | 77e0597 | 2013-11-06 19:16:43 +0100 | [diff] [blame] | 29 | #include <decoding.h> |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 30 | |
| 31 | extern "C" { |
| 32 | #include <osmocom/core/msgb.h> |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 33 | #include <osmocom/core/talloc.h> |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 34 | } |
| 35 | |
| 36 | #include <errno.h> |
| 37 | #include <string.h> |
| 38 | |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 39 | /* After sending these frames, we poll for ack/nack. */ |
| 40 | #define POLL_ACK_AFTER_FRAMES 20 |
Holger Hans Peter Freyther | 77e0597 | 2013-11-06 19:16:43 +0100 | [diff] [blame] | 41 | /* After receiving these frames, we send ack/nack. */ |
| 42 | #define SEND_ACK_AFTER_FRAMES 20 |
| 43 | |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 44 | |
Holger Hans Peter Freyther | 2db7e7e | 2013-10-26 20:45:35 +0200 | [diff] [blame] | 45 | /* If acknowledgement to downlink assignment should be polled */ |
| 46 | #define POLLING_ASSIGNMENT_DL 1 |
Holger Hans Peter Freyther | ae03f22 | 2013-10-26 21:20:51 +0200 | [diff] [blame] | 47 | #define POLLING_ASSIGNMENT_UL 1 |
Holger Hans Peter Freyther | 2db7e7e | 2013-10-26 20:45:35 +0200 | [diff] [blame] | 48 | |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 49 | static const struct gprs_rlcmac_cs gprs_rlcmac_cs[] = { |
| 50 | /* frame length data block max payload */ |
| 51 | { 0, 0, 0 }, |
| 52 | { 23, 23, 20 }, /* CS-1 */ |
| 53 | { 34, 33, 30 }, /* CS-2 */ |
| 54 | { 40, 39, 36 }, /* CS-3 */ |
| 55 | { 54, 53, 50 }, /* CS-4 */ |
| 56 | }; |
| 57 | |
Holger Hans Peter Freyther | 1702f10 | 2013-10-20 08:44:02 +0200 | [diff] [blame] | 58 | extern "C" { |
| 59 | int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, |
| 60 | uint8_t num_frames, uint32_t num_octets); |
| 61 | } |
| 62 | |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 63 | extern void *tall_pcu_ctx; |
| 64 | |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 65 | static void tbf_timer_cb(void *_tbf); |
| 66 | |
Holger Hans Peter Freyther | d9262b3 | 2013-10-26 20:12:59 +0200 | [diff] [blame] | 67 | inline gprs_rlcmac_bts *gprs_rlcmac_tbf::bts_data() const |
| 68 | { |
| 69 | return bts->bts_data(); |
| 70 | } |
| 71 | |
Holger Hans Peter Freyther | d1d114f | 2013-08-24 20:46:18 +0200 | [diff] [blame] | 72 | static inline void tbf_update_ms_class(struct gprs_rlcmac_tbf *tbf, |
| 73 | const uint8_t ms_class) |
| 74 | { |
| 75 | if (!tbf->ms_class && ms_class) |
| 76 | tbf->ms_class = ms_class; |
| 77 | } |
| 78 | |
Holger Hans Peter Freyther | 5464c9b | 2013-10-27 20:57:35 +0100 | [diff] [blame] | 79 | void gprs_rlcmac_tbf::assign_imsi(const char *imsi) |
Holger Hans Peter Freyther | d868928 | 2013-08-24 20:51:06 +0200 | [diff] [blame] | 80 | { |
Holger Hans Peter Freyther | 5464c9b | 2013-10-27 20:57:35 +0100 | [diff] [blame] | 81 | strncpy(m_imsi, imsi, sizeof(m_imsi)); |
| 82 | m_imsi[sizeof(m_imsi) - 1] = '\0'; |
Holger Hans Peter Freyther | d868928 | 2013-08-24 20:51:06 +0200 | [diff] [blame] | 83 | } |
| 84 | |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 85 | static struct gprs_rlcmac_tbf *tbf_lookup_dl(BTS *bts, |
| 86 | const uint32_t tlli, const char *imsi) |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 87 | { |
| 88 | /* 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] | 89 | return bts->tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF); |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | static int tbf_append_data(struct gprs_rlcmac_tbf *tbf, |
| 93 | struct gprs_rlcmac_bts *bts, |
| 94 | const uint8_t ms_class, |
| 95 | const uint16_t pdu_delay_csec, |
| 96 | const uint8_t *data, const uint16_t len) |
| 97 | { |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 98 | LOGP(DRLCMAC, LOGL_INFO, "%s append\n", tbf_name(tbf)); |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 99 | if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE)) { |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 100 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 101 | "%s in WAIT RELEASE state " |
| 102 | "(T3193), so reuse TBF\n", tbf_name(tbf)); |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 103 | tbf->m_llc.put_frame(data, len); |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 104 | /* reset rlc states */ |
| 105 | memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); |
| 106 | /* keep to flags */ |
| 107 | tbf->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; |
| 108 | tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
Holger Hans Peter Freyther | d1d114f | 2013-08-24 20:46:18 +0200 | [diff] [blame] | 109 | tbf_update_ms_class(tbf, ms_class); |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 110 | tbf->update(); |
Holger Hans Peter Freyther | 24c1a5b | 2013-10-26 20:27:44 +0200 | [diff] [blame] | 111 | tbf->bts->trigger_dl_ass(tbf, tbf, NULL); |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 112 | } else { |
| 113 | /* the TBF exists, so we must write it in the queue |
| 114 | * we prepend lifetime in front of PDU */ |
| 115 | struct timeval *tv; |
| 116 | struct msgb *llc_msg = msgb_alloc(len + sizeof(*tv), |
| 117 | "llc_pdu_queue"); |
| 118 | if (!llc_msg) |
| 119 | return -ENOMEM; |
| 120 | tv = (struct timeval *)msgb_put(llc_msg, sizeof(*tv)); |
| 121 | |
| 122 | uint16_t delay_csec; |
| 123 | if (bts->force_llc_lifetime) |
| 124 | delay_csec = bts->force_llc_lifetime; |
| 125 | else |
| 126 | delay_csec = pdu_delay_csec; |
| 127 | /* keep timestap at 0 for infinite delay */ |
| 128 | if (delay_csec != 0xffff) { |
| 129 | /* calculate timestamp of timeout */ |
| 130 | gettimeofday(tv, NULL); |
| 131 | tv->tv_usec += (delay_csec % 100) * 10000; |
| 132 | tv->tv_sec += delay_csec / 100; |
| 133 | if (tv->tv_usec > 999999) { |
| 134 | tv->tv_usec -= 1000000; |
| 135 | tv->tv_sec++; |
| 136 | } |
| 137 | } |
| 138 | memcpy(msgb_put(llc_msg, len), data, len); |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 139 | tbf->m_llc.enqueue(llc_msg); |
Holger Hans Peter Freyther | d1d114f | 2013-08-24 20:46:18 +0200 | [diff] [blame] | 140 | tbf_update_ms_class(tbf, ms_class); |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | return 0; |
| 144 | } |
| 145 | |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 146 | static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts, |
| 147 | const char *imsi, |
| 148 | const uint32_t tlli, const uint8_t ms_class, |
| 149 | const uint8_t *data, const uint16_t len) |
| 150 | { |
| 151 | uint8_t trx, ta, ss; |
| 152 | int8_t use_trx; |
| 153 | struct gprs_rlcmac_tbf *old_tbf, *tbf; |
| 154 | int8_t tfi; /* must be signed */ |
| 155 | int rc; |
| 156 | |
| 157 | /* check for uplink data, so we copy our informations */ |
Holger Hans Peter Freyther | bb20b2c | 2013-08-24 21:22:16 +0200 | [diff] [blame] | 158 | #warning "Do the same look up for IMSI, TLLI and OLD_TLLI" |
| 159 | #warning "Refactor the below lines... into a new method" |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 160 | 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] | 161 | if (tbf && tbf->dir.ul.contention_resolution_done |
| 162 | && !tbf->dir.ul.final_ack_sent) { |
Holger Hans Peter Freyther | ec80f82 | 2013-10-27 13:44:37 +0100 | [diff] [blame] | 163 | use_trx = tbf->trx->trx_no; |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 164 | ta = tbf->ta; |
| 165 | ss = 0; |
| 166 | old_tbf = tbf; |
| 167 | } else { |
| 168 | use_trx = -1; |
| 169 | /* we already have an uplink TBF, so we use that TA */ |
| 170 | if (tbf) |
| 171 | ta = tbf->ta; |
| 172 | else { |
| 173 | /* recall TA */ |
Holger Hans Peter Freyther | 111614a | 2013-10-19 20:04:57 +0200 | [diff] [blame] | 174 | rc = bts->bts->timing_advance()->recall(tlli); |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 175 | if (rc < 0) { |
| 176 | LOGP(DRLCMAC, LOGL_NOTICE, "TA unknown" |
| 177 | ", assuming 0\n"); |
| 178 | ta = 0; |
| 179 | } else |
| 180 | ta = rc; |
| 181 | } |
| 182 | ss = 1; /* PCH assignment only allows one timeslot */ |
| 183 | old_tbf = NULL; |
| 184 | } |
| 185 | |
| 186 | // Create new TBF (any TRX) |
Holger Hans Peter Freyther | bcafdf8 | 2013-08-24 21:13:31 +0200 | [diff] [blame] | 187 | #warning "Copy and paste with alloc_ul_tbf" |
Holger Hans Peter Freyther | 70ddde6 | 2013-10-26 19:17:58 +0200 | [diff] [blame] | 188 | 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] | 189 | if (tfi < 0) { |
| 190 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
| 191 | /* FIXME: send reject */ |
| 192 | return -EBUSY; |
| 193 | } |
| 194 | /* set number of downlink slots according to multislot class */ |
| 195 | tbf = tbf_alloc(bts, tbf, GPRS_RLCMAC_DL_TBF, tfi, trx, ms_class, ss); |
| 196 | if (!tbf) { |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 197 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 198 | /* FIXME: send reject */ |
| 199 | return -EBUSY; |
| 200 | } |
Holger Hans Peter Freyther | 474685e | 2013-10-27 17:01:14 +0100 | [diff] [blame] | 201 | tbf->m_tlli = tlli; |
| 202 | tbf->m_tlli_valid = 1; |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 203 | tbf->ta = ta; |
| 204 | |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 205 | LOGP(DRLCMAC, LOGL_DEBUG, "%s [DOWNLINK] START\n", tbf_name(tbf)); |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 206 | |
| 207 | /* new TBF, so put first frame */ |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 208 | tbf->m_llc.put_frame(data, len); |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 209 | |
Holger Hans Peter Freyther | 5464c9b | 2013-10-27 20:57:35 +0100 | [diff] [blame] | 210 | /* Store IMSI for later look-up and PCH retransmission */ |
| 211 | tbf->assign_imsi(imsi); |
| 212 | |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 213 | /* trigger downlink assignment and set state to ASSIGN. |
| 214 | * we don't use old_downlink, so the possible uplink is used |
| 215 | * to trigger downlink assignment. if there is no uplink, |
| 216 | * AGCH is used. */ |
Holger Hans Peter Freyther | 24c1a5b | 2013-10-26 20:27:44 +0200 | [diff] [blame] | 217 | tbf->bts->trigger_dl_ass(tbf, old_tbf, imsi); |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 218 | return 0; |
| 219 | } |
| 220 | |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 221 | /** |
| 222 | * TODO: split into unit test-able parts... |
| 223 | */ |
| 224 | int tbf_handle(struct gprs_rlcmac_bts *bts, |
| 225 | const uint32_t tlli, const char *imsi, |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 226 | const uint8_t ms_class, const uint16_t delay_csec, |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 227 | const uint8_t *data, const uint16_t len) |
| 228 | { |
| 229 | struct gprs_rlcmac_tbf *tbf; |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 230 | |
| 231 | /* check for existing TBF */ |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 232 | tbf = tbf_lookup_dl(bts->bts, tlli, imsi); |
Holger Hans Peter Freyther | 31d0df9 | 2013-08-24 20:42:45 +0200 | [diff] [blame] | 233 | if (tbf) { |
| 234 | int rc = tbf_append_data(tbf, bts, ms_class, |
| 235 | delay_csec, data, len); |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 236 | if (rc >= 0) |
Holger Hans Peter Freyther | 5464c9b | 2013-10-27 20:57:35 +0100 | [diff] [blame] | 237 | tbf->assign_imsi(imsi); |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 238 | return rc; |
| 239 | } |
Holger Hans Peter Freyther | 17c31ce | 2013-08-24 18:31:27 +0200 | [diff] [blame] | 240 | |
Holger Hans Peter Freyther | 443c822 | 2013-08-24 20:59:46 +0200 | [diff] [blame] | 241 | 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] | 242 | } |
Holger Hans Peter Freyther | 8692128 | 2013-08-24 21:26:42 +0200 | [diff] [blame] | 243 | |
| 244 | struct gprs_rlcmac_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts, |
| 245 | int8_t use_trx, uint8_t ms_class, |
| 246 | uint32_t tlli, uint8_t ta, struct gprs_rlcmac_tbf *dl_tbf) |
| 247 | { |
| 248 | uint8_t trx; |
| 249 | struct gprs_rlcmac_tbf *tbf; |
| 250 | uint8_t tfi; |
| 251 | |
| 252 | #warning "Copy and paste with tbf_new_dl_assignment" |
| 253 | /* create new TBF, use sme TRX as DL TBF */ |
Holger Hans Peter Freyther | 70ddde6 | 2013-10-26 19:17:58 +0200 | [diff] [blame] | 254 | 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] | 255 | if (tfi < 0) { |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 256 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
Holger Hans Peter Freyther | 8692128 | 2013-08-24 21:26:42 +0200 | [diff] [blame] | 257 | /* FIXME: send reject */ |
| 258 | return NULL; |
| 259 | } |
| 260 | /* use multislot class of downlink TBF */ |
| 261 | tbf = tbf_alloc(bts, dl_tbf, GPRS_RLCMAC_UL_TBF, tfi, trx, ms_class, 0); |
| 262 | if (!tbf) { |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 263 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
Holger Hans Peter Freyther | 8692128 | 2013-08-24 21:26:42 +0200 | [diff] [blame] | 264 | /* FIXME: send reject */ |
| 265 | return NULL; |
| 266 | } |
Holger Hans Peter Freyther | 474685e | 2013-10-27 17:01:14 +0100 | [diff] [blame] | 267 | tbf->m_tlli = tlli; |
| 268 | tbf->m_tlli_valid = 1; /* no contention resolution */ |
Holger Hans Peter Freyther | 8692128 | 2013-08-24 21:26:42 +0200 | [diff] [blame] | 269 | tbf->dir.ul.contention_resolution_done = 1; |
| 270 | tbf->ta = ta; /* use current TA */ |
| 271 | tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN); |
| 272 | tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH); |
| 273 | tbf_timer_start(tbf, 3169, bts->t3169, 0); |
| 274 | |
| 275 | return tbf; |
| 276 | } |
Holger Hans Peter Freyther | 964ddb6 | 2013-10-16 17:53:23 +0200 | [diff] [blame] | 277 | |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 278 | static void tbf_unlink_pdch(struct gprs_rlcmac_tbf *tbf) |
| 279 | { |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 280 | struct gprs_rlcmac_pdch *pdch; |
| 281 | int ts; |
| 282 | |
| 283 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) { |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 284 | tbf->trx->ul_tbf[tbf->tfi()] = NULL; |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 285 | for (ts = 0; ts < 8; ts++) { |
| 286 | pdch = tbf->pdch[ts]; |
| 287 | if (pdch) |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 288 | pdch->ul_tbf[tbf->tfi()] = NULL; |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 289 | tbf->pdch[ts] = NULL; |
| 290 | } |
| 291 | } else { |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 292 | tbf->trx->dl_tbf[tbf->tfi()] = NULL; |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 293 | for (ts = 0; ts < 8; ts++) { |
| 294 | pdch = tbf->pdch[ts]; |
| 295 | if (pdch) |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 296 | pdch->dl_tbf[tbf->tfi()] = NULL; |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 297 | tbf->pdch[ts] = NULL; |
| 298 | } |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | void tbf_free(struct gprs_rlcmac_tbf *tbf) |
| 303 | { |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 304 | /* Give final measurement report */ |
| 305 | gprs_rlcmac_rssi_rep(tbf); |
| 306 | gprs_rlcmac_lost_rep(tbf); |
| 307 | |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 308 | debug_diagram(tbf->bts, tbf->diag, "+---------------+"); |
| 309 | debug_diagram(tbf->bts, tbf->diag, "| THE END |"); |
| 310 | debug_diagram(tbf->bts, tbf->diag, "+---------------+"); |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 311 | LOGP(DRLCMAC, LOGL_INFO, "%s free\n", tbf_name(tbf)); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 312 | if (tbf->ul_ass_state != GPRS_RLCMAC_UL_ASS_NONE) |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 313 | LOGP(DRLCMAC, LOGL_ERROR, "%s Software error: Pending uplink " |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 314 | "assignment. This may not happen, because the " |
| 315 | "assignment message never gets transmitted. Please " |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 316 | "be sure not to free in this state. PLEASE FIX!\n", |
| 317 | tbf_name(tbf)); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 318 | if (tbf->dl_ass_state != GPRS_RLCMAC_DL_ASS_NONE) |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 319 | LOGP(DRLCMAC, LOGL_ERROR, "%s Software error: Pending downlink " |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 320 | "assignment. This may not happen, because the " |
| 321 | "assignment message never gets transmitted. Please " |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 322 | "be sure not to free in this state. PLEASE FIX!\n", |
| 323 | tbf_name(tbf)); |
Holger Hans Peter Freyther | 86300bb | 2013-10-26 18:01:35 +0200 | [diff] [blame] | 324 | tbf->stop_timer(); |
Holger Hans Peter Freyther | 782f6dd | 2013-10-26 18:31:51 +0200 | [diff] [blame] | 325 | #warning "TODO: Could/Should generate bssgp_tx_llc_discarded" |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 326 | tbf->m_llc.clear(tbf->bts); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 327 | tbf_unlink_pdch(tbf); |
| 328 | llist_del(&tbf->list); |
Holger Hans Peter Freyther | 1587764 | 2013-10-27 09:50:15 +0100 | [diff] [blame] | 329 | |
| 330 | if (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| 331 | tbf->bts->tbf_ul_freed(); |
| 332 | else |
| 333 | tbf->bts->tbf_dl_freed(); |
| 334 | |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 335 | LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF ends here **********\n"); |
| 336 | talloc_free(tbf); |
| 337 | } |
| 338 | |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 339 | int gprs_rlcmac_tbf::update() |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 340 | { |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 341 | struct gprs_rlcmac_tbf *ul_tbf = NULL; |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 342 | struct gprs_rlcmac_bts *bts_data = bts->bts_data(); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 343 | int rc; |
| 344 | |
| 345 | LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF update **********\n"); |
| 346 | |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 347 | if (direction != GPRS_RLCMAC_DL_TBF) |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 348 | return -EINVAL; |
| 349 | |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 350 | if (!ms_class) { |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 351 | LOGP(DRLCMAC, LOGL_DEBUG, "- Cannot update, no class\n"); |
| 352 | return -EINVAL; |
| 353 | } |
| 354 | |
Holger Hans Peter Freyther | 474685e | 2013-10-27 17:01:14 +0100 | [diff] [blame] | 355 | ul_tbf = bts->tbf_by_tlli(m_tlli, GPRS_RLCMAC_UL_TBF); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 356 | |
Holger Hans Peter Freyther | aa9c326 | 2013-10-26 17:49:36 +0200 | [diff] [blame] | 357 | tbf_unlink_pdch(this); |
| 358 | rc = bts_data->alloc_algorithm(bts_data, ul_tbf, this, bts_data->alloc_algorithm_curst, 0); |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 359 | /* if no resource */ |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 360 | if (rc < 0) { |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 361 | LOGP(DRLCMAC, LOGL_ERROR, "No resource after update???\n"); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 362 | return -rc; |
| 363 | } |
| 364 | |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | int tbf_assign_control_ts(struct gprs_rlcmac_tbf *tbf) |
| 369 | { |
| 370 | if (tbf->control_ts == 0xff) |
| 371 | LOGP(DRLCMAC, LOGL_INFO, "- Setting Control TS %d\n", |
| 372 | tbf->first_common_ts); |
| 373 | else if (tbf->control_ts != tbf->first_common_ts) |
| 374 | LOGP(DRLCMAC, LOGL_INFO, "- Changing Control TS %d\n", |
| 375 | tbf->first_common_ts); |
| 376 | tbf->control_ts = tbf->first_common_ts; |
| 377 | |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | static const char *tbf_state_name[] = { |
| 382 | "NULL", |
| 383 | "ASSIGN", |
| 384 | "FLOW", |
| 385 | "FINISHED", |
| 386 | "WAIT RELEASE", |
| 387 | "RELEASING", |
| 388 | }; |
| 389 | |
| 390 | void tbf_new_state(struct gprs_rlcmac_tbf *tbf, |
| 391 | enum gprs_rlcmac_tbf_state state) |
| 392 | { |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 393 | debug_diagram(tbf->bts, tbf->diag, "->%s", tbf_state_name[state]); |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 394 | LOGP(DRLCMAC, LOGL_DEBUG, "%s changes state from %s to %s\n", |
| 395 | tbf_name(tbf), |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 396 | tbf_state_name[tbf->state], tbf_state_name[state]); |
Holger Hans Peter Freyther | 1c344e2 | 2013-10-16 18:33:18 +0200 | [diff] [blame] | 397 | tbf->set_state(state); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 398 | } |
| 399 | |
| 400 | void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T, |
| 401 | unsigned int seconds, unsigned int microseconds) |
| 402 | { |
| 403 | if (!osmo_timer_pending(&tbf->timer)) |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 404 | LOGP(DRLCMAC, LOGL_DEBUG, "%s starting timer %u.\n", |
| 405 | tbf_name(tbf), T); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 406 | else |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 407 | LOGP(DRLCMAC, LOGL_DEBUG, "%s restarting timer %u " |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 408 | "while old timer %u pending \n", |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 409 | tbf_name(tbf), T, tbf->T); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 410 | |
| 411 | tbf->T = T; |
| 412 | tbf->num_T_exp = 0; |
| 413 | |
| 414 | /* Tunning timers can be safely re-scheduled. */ |
| 415 | tbf->timer.data = tbf; |
| 416 | tbf->timer.cb = &tbf_timer_cb; |
| 417 | |
| 418 | osmo_timer_schedule(&tbf->timer, seconds, microseconds); |
| 419 | } |
| 420 | |
Holger Hans Peter Freyther | 86300bb | 2013-10-26 18:01:35 +0200 | [diff] [blame] | 421 | void gprs_rlcmac_tbf::stop_t3191() |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 422 | { |
Holger Hans Peter Freyther | 86300bb | 2013-10-26 18:01:35 +0200 | [diff] [blame] | 423 | return stop_timer(); |
| 424 | } |
| 425 | |
| 426 | void gprs_rlcmac_tbf::stop_timer() |
| 427 | { |
| 428 | if (osmo_timer_pending(&timer)) { |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 429 | LOGP(DRLCMAC, LOGL_DEBUG, "%s stopping timer %u.\n", |
| 430 | tbf_name(this), T); |
Holger Hans Peter Freyther | 86300bb | 2013-10-26 18:01:35 +0200 | [diff] [blame] | 431 | osmo_timer_del(&timer); |
Holger Hans Peter Freyther | 4556130 | 2013-10-16 17:55:57 +0200 | [diff] [blame] | 432 | } |
| 433 | } |
| 434 | |
Holger Hans Peter Freyther | d9262b3 | 2013-10-26 20:12:59 +0200 | [diff] [blame] | 435 | void gprs_rlcmac_tbf::poll_timeout() |
| 436 | { |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 437 | LOGP(DRLCMAC, LOGL_NOTICE, "%s poll timeout\n", |
| 438 | tbf_name(this)); |
Holger Hans Peter Freyther | d9262b3 | 2013-10-26 20:12:59 +0200 | [diff] [blame] | 439 | |
| 440 | poll_state = GPRS_RLCMAC_POLL_NONE; |
| 441 | |
| 442 | if (ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) { |
| 443 | if (!(state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) { |
| 444 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 445 | "PACKET CONTROL ACK for PACKET UPLINK ACK\n"); |
| 446 | rlcmac_diag(); |
| 447 | state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK); |
| 448 | } |
| 449 | ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
| 450 | debug_diagram(bts, this->diag, "timeout UL-ACK"); |
| 451 | if (state_is(GPRS_RLCMAC_FINISHED)) { |
| 452 | dir.ul.n3103++; |
| 453 | if (dir.ul.n3103 == bts->bts_data()->n3103) { |
| 454 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 455 | "- N3103 exceeded\n"); |
| 456 | debug_diagram(bts, diag, "N3103 exceeded"); |
| 457 | tbf_new_state(this, GPRS_RLCMAC_RELEASING); |
| 458 | tbf_timer_start(this, 3169, bts->bts_data()->t3169, 0); |
| 459 | return; |
| 460 | } |
| 461 | /* reschedule UL ack */ |
| 462 | ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 463 | } |
| 464 | } else if (ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) { |
| 465 | if (!(state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) { |
| 466 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 467 | "PACKET CONTROL ACK for PACKET UPLINK " |
| 468 | "ASSIGNMENT.\n"); |
| 469 | rlcmac_diag(); |
| 470 | state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS); |
| 471 | } |
| 472 | ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 473 | debug_diagram(bts, diag, "timeout UL-ASS"); |
| 474 | n3105++; |
| 475 | if (n3105 == bts_data()->n3105) { |
| 476 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
| 477 | debug_diagram(bts, diag, "N3105 exceeded"); |
| 478 | tbf_new_state(this, GPRS_RLCMAC_RELEASING); |
| 479 | tbf_timer_start(this, 3195, bts_data()->t3195, 0); |
| 480 | return; |
| 481 | } |
| 482 | /* reschedule UL assignment */ |
| 483 | ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS; |
| 484 | } else if (dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) { |
| 485 | if (!(state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) { |
| 486 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 487 | "PACKET CONTROL ACK for PACKET DOWNLINK " |
| 488 | "ASSIGNMENT.\n"); |
| 489 | rlcmac_diag(); |
| 490 | state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS); |
| 491 | } |
| 492 | dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 493 | debug_diagram(bts, diag, "timeout DL-ASS"); |
| 494 | n3105++; |
| 495 | if (n3105 == bts->bts_data()->n3105) { |
| 496 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
| 497 | debug_diagram(bts, diag, "N3105 exceeded"); |
| 498 | tbf_new_state(this, GPRS_RLCMAC_RELEASING); |
| 499 | tbf_timer_start(this, 3195, bts_data()->t3195, 0); |
| 500 | return; |
| 501 | } |
| 502 | /* reschedule DL assignment */ |
| 503 | dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS; |
| 504 | } else if (direction == GPRS_RLCMAC_DL_TBF) { |
| 505 | if (!(state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| 506 | LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling " |
| 507 | "PACKET DOWNLINK ACK.\n"); |
| 508 | rlcmac_diag(); |
| 509 | state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 510 | } |
| 511 | debug_diagram(bts, diag, "timeout DL-ACK"); |
| 512 | n3105++; |
| 513 | if (n3105 == bts->bts_data()->n3105) { |
| 514 | LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n"); |
| 515 | debug_diagram(bts, diag, "N3105 exceeded"); |
| 516 | tbf_new_state(this, GPRS_RLCMAC_RELEASING); |
| 517 | tbf_timer_start(this, 3195, bts_data()->t3195, 0); |
| 518 | return; |
| 519 | } |
| 520 | /* resend IMM.ASS on CCCH on timeout */ |
| 521 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)) |
| 522 | && !(state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) { |
| 523 | LOGP(DRLCMAC, LOGL_DEBUG, "Re-send dowlink assignment " |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 524 | "for %s on PCH (IMSI=%s)\n", |
| 525 | tbf_name(this), |
Holger Hans Peter Freyther | 5464c9b | 2013-10-27 20:57:35 +0100 | [diff] [blame] | 526 | m_imsi); |
Holger Hans Peter Freyther | d9262b3 | 2013-10-26 20:12:59 +0200 | [diff] [blame] | 527 | /* send immediate assignment */ |
Holger Hans Peter Freyther | 5464c9b | 2013-10-27 20:57:35 +0100 | [diff] [blame] | 528 | bts->snd_dl_ass(this, 0, m_imsi); |
Holger Hans Peter Freyther | d9262b3 | 2013-10-26 20:12:59 +0200 | [diff] [blame] | 529 | dir.dl.wait_confirm = 1; |
| 530 | } |
| 531 | } else |
| 532 | LOGP(DRLCMAC, LOGL_ERROR, "- Poll Timeout, but no event!\n"); |
| 533 | } |
| 534 | |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 535 | struct gprs_rlcmac_tbf *tbf_alloc(struct gprs_rlcmac_bts *bts, |
| 536 | struct gprs_rlcmac_tbf *old_tbf, enum gprs_rlcmac_tbf_direction dir, |
| 537 | uint8_t tfi, uint8_t trx, |
| 538 | uint8_t ms_class, uint8_t single_slot) |
| 539 | { |
| 540 | struct gprs_rlcmac_tbf *tbf; |
| 541 | int rc; |
| 542 | |
| 543 | #ifdef DEBUG_DIAGRAM |
| 544 | /* hunt for first free number in diagram */ |
| 545 | int diagram_num; |
| 546 | for (diagram_num = 0; ; diagram_num++) { |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 547 | llist_for_each_entry(tbf, &bts->ul_tbfs, list) { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 548 | if (tbf->diag == diagram_num) |
| 549 | goto next_diagram; |
| 550 | } |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 551 | llist_for_each_entry(tbf, &bts->dl_tbfs, list) { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 552 | if (tbf->diag == diagram_num) |
| 553 | goto next_diagram; |
| 554 | } |
| 555 | break; |
| 556 | next_diagram: |
| 557 | continue; |
| 558 | } |
| 559 | #endif |
| 560 | |
| 561 | LOGP(DRLCMAC, LOGL_DEBUG, "********** TBF starts here **********\n"); |
| 562 | LOGP(DRLCMAC, LOGL_INFO, "Allocating %s TBF: TFI=%d TRX=%d " |
| 563 | "MS_CLASS=%d\n", (dir == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", |
| 564 | tfi, trx, ms_class); |
| 565 | |
| 566 | if (trx >= 8 || tfi >= 32) |
| 567 | return NULL; |
| 568 | |
| 569 | tbf = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_tbf); |
| 570 | if (!tbf) |
| 571 | return NULL; |
| 572 | |
Holger Hans Peter Freyther | 9f0c1d2 | 2013-10-19 21:24:34 +0200 | [diff] [blame] | 573 | tbf->bts = bts->bts; |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 574 | #ifdef DEBUG_DIAGRAM |
| 575 | tbf->diag = diagram_num; |
| 576 | #endif |
| 577 | tbf->direction = dir; |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 578 | tbf->m_tfi = tfi; |
Holger Hans Peter Freyther | 743bafa | 2013-09-29 07:50:50 +0200 | [diff] [blame] | 579 | tbf->trx = &bts->trx[trx]; |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 580 | tbf->ms_class = ms_class; |
| 581 | tbf->ws = 64; |
| 582 | tbf->sns = 128; |
| 583 | /* select algorithm */ |
| 584 | rc = bts->alloc_algorithm(bts, old_tbf, tbf, bts->alloc_algorithm_curst, |
| 585 | single_slot); |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 586 | /* if no resource */ |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 587 | if (rc < 0) { |
| 588 | talloc_free(tbf); |
| 589 | return NULL; |
| 590 | } |
| 591 | /* assign control ts */ |
| 592 | tbf->control_ts = 0xff; |
| 593 | rc = tbf_assign_control_ts(tbf); |
Holger Hans Peter Freyther | 90b87ea | 2013-10-27 10:38:31 +0100 | [diff] [blame] | 594 | /* if no resource */ |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 595 | if (rc < 0) { |
| 596 | talloc_free(tbf); |
| 597 | return NULL; |
| 598 | } |
| 599 | |
| 600 | /* set timestamp */ |
| 601 | gettimeofday(&tbf->meas.dl_bw_tv, NULL); |
| 602 | gettimeofday(&tbf->meas.rssi_tv, NULL); |
| 603 | gettimeofday(&tbf->meas.dl_loss_tv, NULL); |
| 604 | |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 605 | tbf->m_llc.init(); |
Holger Hans Peter Freyther | 1587764 | 2013-10-27 09:50:15 +0100 | [diff] [blame] | 606 | if (dir == GPRS_RLCMAC_UL_TBF) { |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 607 | llist_add(&tbf->list, &bts->ul_tbfs); |
Holger Hans Peter Freyther | 1587764 | 2013-10-27 09:50:15 +0100 | [diff] [blame] | 608 | tbf->bts->tbf_ul_created(); |
| 609 | } else { |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 610 | llist_add(&tbf->list, &bts->dl_tbfs); |
Holger Hans Peter Freyther | 1587764 | 2013-10-27 09:50:15 +0100 | [diff] [blame] | 611 | tbf->bts->tbf_dl_created(); |
| 612 | } |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 613 | |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 614 | debug_diagram(bts->bts, tbf->diag, "+-----------------+"); |
| 615 | 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] | 616 | (dir == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tfi); |
Holger Hans Peter Freyther | 34bd8bd | 2013-10-19 21:10:38 +0200 | [diff] [blame] | 617 | debug_diagram(bts->bts, tbf->diag, "+-----------------+"); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 618 | |
| 619 | return tbf; |
| 620 | } |
| 621 | |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 622 | static void tbf_timer_cb(void *_tbf) |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 623 | { |
| 624 | struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf; |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 625 | tbf->handle_timeout(); |
| 626 | } |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 627 | |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 628 | void gprs_rlcmac_tbf::handle_timeout() |
| 629 | { |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 630 | LOGP(DRLCMAC, LOGL_DEBUG, "%s timer %u expired.\n", |
| 631 | tbf_name(this), T); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 632 | |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 633 | num_T_exp++; |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 634 | |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 635 | switch (T) { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 636 | case 0: /* assignment */ |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 637 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) { |
| 638 | if (state_is(GPRS_RLCMAC_ASSIGN)) { |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 639 | LOGP(DRLCMAC, LOGL_NOTICE, "%s releasing due to " |
| 640 | "PACCH assignment timeout.\n", tbf_name(this)); |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 641 | tbf_free(this); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 642 | } else |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 643 | LOGP(DRLCMAC, LOGL_ERROR, "Error: %s is not " |
| 644 | "in assign state\n", tbf_name(this)); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 645 | } |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 646 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) { |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 647 | /* change state to FLOW, so scheduler will start transmission */ |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 648 | dir.dl.wait_confirm = 0; |
| 649 | if (state_is(GPRS_RLCMAC_ASSIGN)) { |
| 650 | tbf_new_state(this, GPRS_RLCMAC_FLOW); |
| 651 | tbf_assign_control_ts(this); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 652 | } else |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 653 | LOGP(DRLCMAC, LOGL_NOTICE, "%s Continue flow after " |
| 654 | "IMM.ASS confirm\n", tbf_name(this)); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 655 | } |
| 656 | break; |
| 657 | case 3169: |
| 658 | case 3191: |
| 659 | case 3195: |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 660 | LOGP(DRLCMAC, LOGL_NOTICE, "%s T%d timeout during " |
| 661 | "transsmission\n", tbf_name(this), T); |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 662 | rlcmac_diag(); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 663 | /* fall through */ |
| 664 | case 3193: |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 665 | if (T == 3193) |
| 666 | debug_diagram(bts, diag, "T3193 timeout"); |
Holger Hans Peter Freyther | 8d0e489 | 2013-10-27 12:42:58 +0100 | [diff] [blame] | 667 | LOGP(DRLCMAC, LOGL_DEBUG, |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 668 | "%s will be freed due to timeout\n", tbf_name(this)); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 669 | /* free TBF */ |
Holger Hans Peter Freyther | af8094d | 2013-10-26 17:56:15 +0200 | [diff] [blame] | 670 | tbf_free(this); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 671 | break; |
| 672 | default: |
Holger Hans Peter Freyther | 8d0e489 | 2013-10-27 12:42:58 +0100 | [diff] [blame] | 673 | LOGP(DRLCMAC, LOGL_ERROR, |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 674 | "%s timer expired in unknown mode: %u\n", tbf_name(this), T); |
Holger Hans Peter Freyther | 7380bab | 2013-10-16 18:09:19 +0200 | [diff] [blame] | 675 | } |
| 676 | } |
| 677 | |
| 678 | int gprs_rlcmac_tbf::rlcmac_diag() |
| 679 | { |
| 680 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) |
| 681 | LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on CCCH\n"); |
| 682 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH))) |
| 683 | LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on PACCH\n"); |
| 684 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_UL_DATA))) |
| 685 | LOGP(DRLCMAC, LOGL_NOTICE, "- Uplink data was received\n"); |
| 686 | else if (direction == GPRS_RLCMAC_UL_TBF) |
| 687 | LOGP(DRLCMAC, LOGL_NOTICE, "- No uplink data received yet\n"); |
| 688 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK))) |
| 689 | LOGP(DRLCMAC, LOGL_NOTICE, "- Downlink ACK was received\n"); |
| 690 | else if (direction == GPRS_RLCMAC_DL_TBF) |
| 691 | LOGP(DRLCMAC, LOGL_NOTICE, "- No downlink ACK received yet\n"); |
| 692 | |
| 693 | return 0; |
| 694 | } |
| 695 | |
Holger Hans Peter Freyther | 1702f10 | 2013-10-20 08:44:02 +0200 | [diff] [blame] | 696 | struct msgb *gprs_rlcmac_tbf::llc_dequeue(bssgp_bvc_ctx *bctx) |
| 697 | { |
| 698 | struct msgb *msg; |
| 699 | struct timeval *tv, tv_now; |
| 700 | uint32_t octets = 0, frames = 0; |
| 701 | |
| 702 | gettimeofday(&tv_now, NULL); |
| 703 | |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 704 | while ((msg = m_llc.dequeue())) { |
Holger Hans Peter Freyther | 1702f10 | 2013-10-20 08:44:02 +0200 | [diff] [blame] | 705 | tv = (struct timeval *)msg->data; |
| 706 | msgb_pull(msg, sizeof(*tv)); |
| 707 | if (tv->tv_sec /* not infinite */ |
| 708 | && (tv_now.tv_sec > tv->tv_sec /* and secs expired */ |
| 709 | || (tv_now.tv_sec == tv->tv_sec /* .. or if secs equal .. */ |
| 710 | && tv_now.tv_usec > tv->tv_usec))) { /* .. usecs expired */ |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 711 | LOGP(DRLCMACDL, LOGL_NOTICE, "%s Discarding LLC PDU " |
| 712 | "because lifetime limit reached\n", |
| 713 | tbf_name(this)); |
Holger Hans Peter Freyther | 1997787 | 2013-10-27 10:34:31 +0100 | [diff] [blame] | 714 | bts->timedout_frame(); |
Holger Hans Peter Freyther | 1702f10 | 2013-10-20 08:44:02 +0200 | [diff] [blame] | 715 | frames++; |
| 716 | octets += msg->len; |
| 717 | msgb_free(msg); |
| 718 | continue; |
| 719 | } |
| 720 | break; |
| 721 | } |
| 722 | |
| 723 | if (frames) { |
| 724 | if (frames > 0xff) |
| 725 | frames = 0xff; |
| 726 | if (octets > 0xffffff) |
| 727 | octets = 0xffffff; |
Holger Hans Peter Freyther | 474685e | 2013-10-27 17:01:14 +0100 | [diff] [blame] | 728 | bssgp_tx_llc_discarded(bctx, m_tlli, frames, octets); |
Holger Hans Peter Freyther | 1702f10 | 2013-10-20 08:44:02 +0200 | [diff] [blame] | 729 | } |
| 730 | |
| 731 | return msg; |
| 732 | } |
| 733 | |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 734 | /* |
| 735 | * Store received block data in LLC message(s) and forward to SGSN |
| 736 | * if complete. |
| 737 | */ |
| 738 | int gprs_rlcmac_tbf::assemble_forward_llc(uint8_t *data, uint8_t len) |
| 739 | { |
| 740 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
| 741 | uint8_t e, m; |
| 742 | struct rlc_li_field *li; |
| 743 | uint8_t frame_offset[16], offset = 0, chunk; |
| 744 | int i, frames = 0; |
| 745 | |
| 746 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len); |
| 747 | |
| 748 | data += 3; |
| 749 | len -= 3; |
| 750 | e = rh->e; /* if extended */ |
| 751 | m = 1; /* more frames, that means: the first frame */ |
| 752 | |
| 753 | /* Parse frame offsets from length indicator(s), if any. */ |
| 754 | while (1) { |
| 755 | if (frames == (int)sizeof(frame_offset)) { |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 756 | LOGP(DRLCMACUL, LOGL_ERROR, "%s too many frames in " |
| 757 | "block\n", tbf_name(this)); |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 758 | return -EINVAL; |
| 759 | } |
| 760 | frame_offset[frames++] = offset; |
| 761 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset " |
| 762 | "%d\n", frames, offset); |
| 763 | if (!len) |
| 764 | break; |
| 765 | /* M == 0 and E == 0 is not allowed in this version. */ |
| 766 | if (!m && !e) { |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 767 | LOGP(DRLCMACUL, LOGL_NOTICE, "%s UL DATA " |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 768 | "ignored, because M='0' and E='0'.\n", |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 769 | tbf_name(this)); |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 770 | return 0; |
| 771 | } |
| 772 | /* no more frames in this segment */ |
| 773 | if (e) { |
| 774 | break; |
| 775 | } |
| 776 | /* There is a new frame and an LI that delimits it. */ |
| 777 | if (m) { |
| 778 | li = (struct rlc_li_field *)data; |
| 779 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n", |
| 780 | li->li); |
| 781 | /* Special case: LI == 0 |
| 782 | * If the last segment would fit precisely into the |
| 783 | * rest of the RLC MAC block, there would be no way |
| 784 | * to delimit that this segment ends and is not |
| 785 | * continued in the next block. |
| 786 | * The special LI (0) is used to force the segment to |
| 787 | * extend into the next block, so it is delimited there. |
| 788 | * This LI must be skipped. Also it is the last LI. |
| 789 | */ |
| 790 | if (li->li == 0) { |
| 791 | data++; |
| 792 | len--; |
| 793 | m = 1; /* M is ignored, we know there is more */ |
| 794 | break; /* handle E as '1', so we break! */ |
| 795 | } |
| 796 | e = li->e; |
| 797 | m = li->m; |
| 798 | offset += li->li; |
| 799 | data++; |
| 800 | len--; |
| 801 | continue; |
| 802 | } |
| 803 | } |
| 804 | if (!m) { |
| 805 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare " |
| 806 | "data\n"); |
| 807 | } |
| 808 | |
| 809 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n", |
| 810 | len); |
| 811 | /* TLLI */ |
| 812 | if (rh->ti) { |
| 813 | if (len < 4) { |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 814 | LOGP(DRLCMACUL, LOGL_NOTICE, "%s UL DATA TLLI out of " |
| 815 | "frame border\n", tbf_name(this)); |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 816 | return -EINVAL; |
| 817 | } |
| 818 | data += 4; |
| 819 | len -= 4; |
| 820 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: " |
| 821 | "%d\n", len); |
| 822 | } |
| 823 | |
| 824 | /* PFI */ |
| 825 | if (rh->pi) { |
| 826 | LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, " |
| 827 | "please disable in SYSTEM INFORMATION\n"); |
| 828 | if (len < 1) { |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 829 | LOGP(DRLCMACUL, LOGL_NOTICE, "%s UL DATA PFI out of " |
| 830 | "frame border\n", tbf_name(this)); |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 831 | return -EINVAL; |
| 832 | } |
| 833 | data++; |
| 834 | len--; |
| 835 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: " |
| 836 | "%d\n", len); |
| 837 | } |
| 838 | |
| 839 | /* Now we have: |
| 840 | * - a list of frames offsets: frame_offset[] |
| 841 | * - number of frames: i |
| 842 | * - m == 0: Last frame carries spare data (end of TBF). |
| 843 | */ |
| 844 | |
| 845 | /* Check if last offset would exceed frame. */ |
| 846 | if (offset > len) { |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 847 | LOGP(DRLCMACUL, LOGL_NOTICE, "%s UL DATA ignored, " |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 848 | "because LI delimits data that exceeds block size.\n", |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 849 | tbf_name(this)); |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 850 | return -EINVAL; |
| 851 | } |
| 852 | |
| 853 | /* create LLC frames */ |
| 854 | for (i = 0; i < frames; i++) { |
| 855 | /* last frame ? */ |
| 856 | if (i == frames - 1) { |
| 857 | /* no more data in last frame */ |
| 858 | if (!m) |
| 859 | break; |
| 860 | /* data until end of frame */ |
| 861 | chunk = len - frame_offset[i]; |
| 862 | } else { |
| 863 | /* data until next frame */ |
| 864 | chunk = frame_offset[i + 1] - frame_offset[i]; |
| 865 | } |
| 866 | LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to " |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 867 | "frame at %d.\n", chunk, m_llc.index); |
| 868 | if (m_llc.index + chunk > LLC_MAX_LEN) { |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 869 | LOGP(DRLCMACUL, LOGL_NOTICE, "%s LLC frame exceeds " |
| 870 | "maximum size.\n", tbf_name(this)); |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 871 | chunk = LLC_MAX_LEN - m_llc.index; |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 872 | } |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 873 | memcpy(m_llc.frame + m_llc.index, data + frame_offset[i], chunk); |
| 874 | m_llc.index += chunk; |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 875 | /* not last frame. */ |
| 876 | if (i != frames - 1) { |
| 877 | /* send frame to SGSN */ |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 878 | LOGP(DRLCMACUL, LOGL_INFO, "%s complete UL frame len=%d\n", |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 879 | tbf_name(this) , m_llc.index); |
Holger Hans Peter Freyther | 9948514 | 2013-11-06 20:08:42 +0100 | [diff] [blame] | 880 | snd_ul_ud(); |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 881 | /* also check if CV==0, because the frame may fill up the |
| 882 | * block precisely, then it is also complete. normally the |
| 883 | * frame would be extended into the next block with a 0-length |
| 884 | * delimiter added to this block. */ |
| 885 | } else if (rh->cv == 0) { |
| 886 | /* send frame to SGSN */ |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 887 | LOGP(DRLCMACUL, LOGL_INFO, "%s complete UL frame " |
| 888 | "that fits precisely in last block: " |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 889 | "len=%d\n", tbf_name(this), m_llc.index); |
Holger Hans Peter Freyther | 9948514 | 2013-11-06 20:08:42 +0100 | [diff] [blame] | 890 | snd_ul_ud(); |
Holger Hans Peter Freyther | d11290b | 2013-10-26 17:32:04 +0200 | [diff] [blame] | 891 | } |
| 892 | } |
| 893 | |
| 894 | return 0; |
| 895 | } |
| 896 | |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 897 | /* |
| 898 | * Create DL data block |
| 899 | * The messages are fragmented and forwarded as data blocks. |
| 900 | */ |
| 901 | struct msgb *gprs_rlcmac_tbf::create_dl_acked_block(uint32_t fn, uint8_t ts) |
| 902 | { |
| 903 | struct rlc_dl_header *rh; |
| 904 | struct rlc_li_field *li; |
| 905 | uint8_t block_length; /* total length of block, including spare bits */ |
| 906 | uint8_t block_data; /* usable data of block, w/o spare bits, inc. MAC */ |
| 907 | struct msgb *msg, *dl_msg; |
| 908 | uint8_t bsn; |
| 909 | uint16_t mod_sns = sns - 1; |
| 910 | uint16_t mod_sns_half = (sns >> 1) - 1; |
| 911 | uint16_t index; |
| 912 | uint8_t *delimiter, *data, *e_pointer; |
| 913 | uint8_t len; |
| 914 | uint16_t space, chunk; |
| 915 | int first_fin_ack = 0; |
| 916 | |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 917 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink (V(A)==%d .. " |
| 918 | "V(S)==%d)\n", tbf_name(this), dir.dl.v_a, dir.dl.v_s); |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 919 | |
| 920 | do_resend: |
| 921 | /* check if there is a block with negative acknowledgement */ |
| 922 | for (bsn = dir.dl.v_a; bsn != dir.dl.v_s; |
| 923 | bsn = (bsn + 1) & mod_sns) { |
| 924 | index = (bsn & mod_sns_half); |
| 925 | if (dir.dl.v_b[index] == 'N' |
| 926 | || dir.dl.v_b[index] == 'X') { |
| 927 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", |
| 928 | bsn); |
| 929 | /* re-send block with negative aknowlegement */ |
| 930 | dir.dl.v_b[index] = 'U'; /* unacked */ |
| 931 | goto tx_block; |
| 932 | } |
| 933 | } |
| 934 | |
| 935 | /* if the window has stalled, or transfer is complete, |
| 936 | * send an unacknowledged block */ |
| 937 | if (state_is(GPRS_RLCMAC_FINISHED) |
| 938 | || ((dir.dl.v_s - dir.dl.v_a) & mod_sns) == ws) { |
| 939 | int resend = 0; |
| 940 | |
| 941 | if (state_is(GPRS_RLCMAC_FINISHED)) |
| 942 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 943 | "because all blocks have been transmitted.\n", |
| 944 | dir.dl.v_a); |
| 945 | else |
| 946 | LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
| 947 | "because all window is stalled.\n", |
| 948 | dir.dl.v_a); |
| 949 | /* If V(S) == V(A) and finished state, we would have received |
| 950 | * acknowledgement of all transmitted block. In this case we |
| 951 | * would have transmitted the final block, and received ack |
| 952 | * from MS. But in this case we did not receive the final ack |
| 953 | * indication from MS. This should never happen if MS works |
| 954 | * correctly. */ |
| 955 | if (dir.dl.v_s == dir.dl.v_a) { |
| 956 | LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks, " |
| 957 | "so we re-transmit final block!\n"); |
| 958 | /* we just send final block again */ |
| 959 | index = ((dir.dl.v_s - 1) & mod_sns_half); |
| 960 | goto tx_block; |
| 961 | } |
| 962 | |
| 963 | /* cycle through all unacked blocks */ |
| 964 | for (bsn = dir.dl.v_a; bsn != dir.dl.v_s; |
| 965 | bsn = (bsn + 1) & mod_sns) { |
| 966 | index = (bsn & mod_sns_half); |
| 967 | if (dir.dl.v_b[index] == 'U') { |
| 968 | /* mark to be re-send */ |
| 969 | dir.dl.v_b[index] = 'X'; |
| 970 | resend++; |
| 971 | } |
| 972 | } |
| 973 | /* At this point there should be at leasst one unacked block |
| 974 | * to be resent. If not, this is an software error. */ |
| 975 | if (resend == 0) { |
| 976 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 977 | "There are no unacknowledged blocks, but V(A) " |
| 978 | " != V(S). PLEASE FIX!\n"); |
| 979 | /* we just send final block again */ |
| 980 | index = ((dir.dl.v_s - 1) & mod_sns_half); |
| 981 | goto tx_block; |
| 982 | } |
| 983 | goto do_resend; |
| 984 | } |
| 985 | |
| 986 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n", |
| 987 | dir.dl.v_s); |
| 988 | |
| 989 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 990 | index = dir.dl.v_s & mod_sns_half; |
| 991 | data = rlc_block[index]; |
| 992 | #warning "Selection of the CS doesn't belong here" |
| 993 | if (cs == 0) { |
| 994 | cs = bts_data()->initial_cs_dl; |
| 995 | if (cs < 1 || cs > 4) |
| 996 | cs = 1; |
| 997 | } |
| 998 | block_length = gprs_rlcmac_cs[cs].block_length; |
| 999 | block_data = gprs_rlcmac_cs[cs].block_data; |
| 1000 | memset(data, 0x2b, block_data); /* spare bits will be left 0 */ |
| 1001 | rh = (struct rlc_dl_header *)data; |
| 1002 | rh->pt = 0; /* Data Block */ |
| 1003 | rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */ |
| 1004 | rh->usf = 7; /* will be set at scheduler */ |
| 1005 | rh->pr = 0; /* FIXME: power reduction */ |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1006 | rh->tfi = m_tfi; /* TFI */ |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1007 | rh->fbi = 0; /* Final Block Indicator, set late, if true */ |
| 1008 | rh->bsn = dir.dl.v_s; /* Block Sequence Number */ |
| 1009 | rh->e = 0; /* Extension bit, maybe set later */ |
| 1010 | e_pointer = data + 2; /* points to E of current chunk */ |
| 1011 | data += 3; |
| 1012 | delimiter = data; /* where next length header would be stored */ |
| 1013 | space = block_data - 3; |
| 1014 | while (1) { |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1015 | chunk = m_llc.length - m_llc.index; |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1016 | /* if chunk will exceed block limit */ |
| 1017 | if (chunk > space) { |
| 1018 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1019 | "larger than space (%d) left in block: copy " |
| 1020 | "only remaining space, and we are done\n", |
| 1021 | chunk, space); |
| 1022 | /* block is filled, so there is no extension */ |
| 1023 | *e_pointer |= 0x01; |
| 1024 | /* fill only space */ |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1025 | memcpy(data, m_llc.frame + m_llc.index, space); |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1026 | /* incement index */ |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1027 | m_llc.index += space; |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1028 | /* return data block as message */ |
| 1029 | break; |
| 1030 | } |
| 1031 | /* if FINAL chunk would fit precisely in space left */ |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1032 | if (chunk == space && llist_empty(&m_llc.queue)) { |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1033 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1034 | "would exactly fit into space (%d): because " |
| 1035 | "this is a final block, we don't add length " |
| 1036 | "header, and we are done\n", chunk, space); |
| 1037 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for " |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1038 | "%s that fits precisely in last block: " |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1039 | "len=%d\n", tbf_name(this), m_llc.length); |
| 1040 | gprs_rlcmac_dl_bw(this, m_llc.length); |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1041 | /* block is filled, so there is no extension */ |
| 1042 | *e_pointer |= 0x01; |
| 1043 | /* fill space */ |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1044 | memcpy(data, m_llc.frame + m_llc.index, space); |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 1045 | m_llc.reset(); |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1046 | /* final block */ |
| 1047 | rh->fbi = 1; /* we indicate final block */ |
| 1048 | tbf_new_state(this, GPRS_RLCMAC_FINISHED); |
| 1049 | /* return data block as message */ |
| 1050 | break; |
| 1051 | } |
| 1052 | /* if chunk would fit exactly in space left */ |
| 1053 | if (chunk == space) { |
| 1054 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 1055 | "would exactly fit into space (%d): add length " |
| 1056 | "header with LI=0, to make frame extend to " |
| 1057 | "next block, and we are done\n", chunk, space); |
| 1058 | /* make space for delimiter */ |
| 1059 | if (delimiter != data) |
| 1060 | memcpy(delimiter + 1, delimiter, |
| 1061 | data - delimiter); |
| 1062 | data++; |
| 1063 | space--; |
| 1064 | /* add LI with 0 length */ |
| 1065 | li = (struct rlc_li_field *)delimiter; |
| 1066 | li->e = 1; /* not more extension */ |
| 1067 | li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| 1068 | li->li = 0; /* chunk fills the complete space */ |
| 1069 | // no need to set e_pointer nor increase delimiter |
| 1070 | /* fill only space, which is 1 octet less than chunk */ |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1071 | memcpy(data, m_llc.frame + m_llc.index, space); |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1072 | /* incement index */ |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1073 | m_llc.index += space; |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1074 | /* return data block as message */ |
| 1075 | break; |
| 1076 | } |
| 1077 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 1078 | "than remaining space (%d): add length header to " |
| 1079 | "to delimit LLC frame\n", chunk, space); |
| 1080 | /* the LLC frame chunk ends in this block */ |
| 1081 | /* make space for delimiter */ |
| 1082 | if (delimiter != data) |
| 1083 | memcpy(delimiter + 1, delimiter, data - delimiter); |
| 1084 | data++; |
| 1085 | space--; |
| 1086 | /* add LI to delimit frame */ |
| 1087 | li = (struct rlc_li_field *)delimiter; |
| 1088 | li->e = 0; /* Extension bit, maybe set later */ |
| 1089 | li->m = 0; /* will be set later, if there is more LLC data */ |
| 1090 | li->li = chunk; /* length of chunk */ |
| 1091 | e_pointer = delimiter; /* points to E of current delimiter */ |
| 1092 | delimiter++; |
| 1093 | /* copy (rest of) LLC frame to space */ |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1094 | memcpy(data, m_llc.frame + m_llc.index, chunk); |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1095 | data += chunk; |
| 1096 | space -= chunk; |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1097 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for %s" |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1098 | "len=%d\n", tbf_name(this), m_llc.length); |
| 1099 | gprs_rlcmac_dl_bw(this, m_llc.length); |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 1100 | m_llc.reset(); |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1101 | /* dequeue next LLC frame, if any */ |
| 1102 | msg = llc_dequeue(gprs_bssgp_pcu_current_bctx()); |
| 1103 | if (msg) { |
| 1104 | LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC for " |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1105 | "%s (len=%d)\n", tbf_name(this), msg->len); |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 1106 | m_llc.update_frame(msg); |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1107 | msgb_free(msg); |
| 1108 | } |
| 1109 | /* if we have more data and we have space left */ |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1110 | if (space > 0 && m_llc.length) { |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1111 | li->m = 1; /* we indicate more frames to follow */ |
| 1112 | continue; |
| 1113 | } |
| 1114 | /* if we don't have more LLC frames */ |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1115 | if (!m_llc.length) { |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1116 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
| 1117 | "done.\n"); |
| 1118 | li->e = 1; /* we cannot extend */ |
| 1119 | rh->fbi = 1; /* we indicate final block */ |
| 1120 | first_fin_ack = 1; |
| 1121 | /* + 1 indicates: first final ack */ |
| 1122 | tbf_new_state(this, GPRS_RLCMAC_FINISHED); |
| 1123 | break; |
| 1124 | } |
| 1125 | /* we have no space left */ |
| 1126 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
| 1127 | "done.\n"); |
| 1128 | li->e = 1; /* we cannot extend */ |
| 1129 | break; |
| 1130 | } |
| 1131 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n", |
| 1132 | osmo_hexdump(rlc_block[index], block_length)); |
| 1133 | rlc_block_len[index] = block_length; |
| 1134 | /* raise send state and set ack state array */ |
| 1135 | dir.dl.v_b[index] = 'U'; /* unacked */ |
| 1136 | dir.dl.v_s = (dir.dl.v_s + 1) & mod_sns; /* inc send state */ |
| 1137 | |
| 1138 | tx_block: |
| 1139 | /* from this point on, new block is sent or old block is resent */ |
| 1140 | |
| 1141 | /* get data and header from current block */ |
| 1142 | data = rlc_block[index]; |
| 1143 | len = rlc_block_len[index]; |
| 1144 | rh = (struct rlc_dl_header *)data; |
| 1145 | |
| 1146 | /* Clear Polling, if still set in history buffer */ |
| 1147 | rh->s_p = 0; |
| 1148 | |
| 1149 | /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| 1150 | */ |
| 1151 | if (dir.dl.tx_counter >= POLL_ACK_AFTER_FRAMES || first_fin_ack) { |
| 1152 | if (first_fin_ack) { |
| 1153 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 1154 | "polling, because first final block sent.\n"); |
| 1155 | } else { |
| 1156 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 1157 | "polling, because %d blocks sent.\n", |
| 1158 | POLL_ACK_AFTER_FRAMES); |
| 1159 | } |
| 1160 | /* scheduling not possible, because: */ |
| 1161 | if (poll_state != GPRS_RLCMAC_POLL_NONE) |
| 1162 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already " |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1163 | "sheduled for %s, so we must wait for " |
| 1164 | "requesting downlink ack\n", tbf_name(this)); |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1165 | else if (control_ts != ts) |
| 1166 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 1167 | "sheduled in this TS %d, waiting for " |
| 1168 | "TS %d\n", ts, control_ts); |
Holger Hans Peter Freyther | ec80f82 | 2013-10-27 13:44:37 +0100 | [diff] [blame] | 1169 | else if (bts->sba()->find(trx->trx_no, ts, (fn + 13) % 2715648)) |
Holger Hans Peter Freyther | 61a0a04 | 2013-10-26 21:48:38 +0200 | [diff] [blame] | 1170 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be " |
| 1171 | "sheduled, because single block alllocation " |
| 1172 | "already exists\n"); |
| 1173 | else { |
| 1174 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling sheduled in this " |
| 1175 | "TS %d\n", ts); |
| 1176 | dir.dl.tx_counter = 0; |
| 1177 | /* start timer whenever we send the final block */ |
| 1178 | if (rh->fbi == 1) |
| 1179 | tbf_timer_start(this, 3191, bts_data()->t3191, 0); |
| 1180 | |
| 1181 | /* schedule polling */ |
| 1182 | poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1183 | poll_fn = (fn + 13) % 2715648; |
| 1184 | |
| 1185 | #ifdef DEBUG_DIAGRAM |
| 1186 | debug_diagram(bts, diag, "poll DL-ACK"); |
| 1187 | if (first_fin_ack) |
| 1188 | debug_diagram(bts, diag, "(is first FINAL)"); |
| 1189 | if (rh->fbi) |
| 1190 | debug_diagram(bts, diag, "(FBI is set)"); |
| 1191 | #endif |
| 1192 | |
| 1193 | /* set polling in header */ |
| 1194 | rh->rrbp = 0; /* N+13 */ |
| 1195 | rh->s_p = 1; /* Polling */ |
| 1196 | |
| 1197 | /* Increment TX-counter */ |
| 1198 | dir.dl.tx_counter++; |
| 1199 | } |
| 1200 | } else { |
| 1201 | /* Increment TX-counter */ |
| 1202 | dir.dl.tx_counter++; |
| 1203 | } |
| 1204 | |
| 1205 | /* return data block as message */ |
| 1206 | dl_msg = msgb_alloc(len, "rlcmac_dl_data"); |
| 1207 | if (!dl_msg) |
| 1208 | return NULL; |
| 1209 | memcpy(msgb_put(dl_msg, len), data, len); |
| 1210 | |
| 1211 | return dl_msg; |
| 1212 | } |
| 1213 | |
Holger Hans Peter Freyther | 2db7e7e | 2013-10-26 20:45:35 +0200 | [diff] [blame] | 1214 | struct msgb *gprs_rlcmac_tbf::create_dl_ass(uint32_t fn) |
| 1215 | { |
| 1216 | struct msgb *msg; |
| 1217 | struct gprs_rlcmac_tbf *new_tbf; |
| 1218 | int poll_ass_dl = POLLING_ASSIGNMENT_DL; |
| 1219 | |
| 1220 | if (poll_ass_dl && direction == GPRS_RLCMAC_DL_TBF |
| 1221 | && control_ts != first_common_ts) { |
| 1222 | LOGP(DRLCMAC, LOGL_NOTICE, "Cannot poll for downlink " |
| 1223 | "assigment, because MS cannot reply. (control TS=%d, " |
| 1224 | "first common TS=%d)\n", control_ts, |
| 1225 | first_common_ts); |
| 1226 | poll_ass_dl = 0; |
| 1227 | } |
| 1228 | if (poll_ass_dl) { |
| 1229 | if (poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 1230 | LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already sheduled " |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1231 | "for %s, so we must wait for downlink " |
| 1232 | "assignment...\n", tbf_name(this)); |
Holger Hans Peter Freyther | 2db7e7e | 2013-10-26 20:45:35 +0200 | [diff] [blame] | 1233 | return NULL; |
| 1234 | } |
Holger Hans Peter Freyther | ec80f82 | 2013-10-27 13:44:37 +0100 | [diff] [blame] | 1235 | if (bts->sba()->find(trx->trx_no, control_ts, (fn + 13) % 2715648)) { |
Holger Hans Peter Freyther | 2db7e7e | 2013-10-26 20:45:35 +0200 | [diff] [blame] | 1236 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 1237 | "scheduled for single block allocation...\n"); |
| 1238 | return NULL; |
| 1239 | } |
| 1240 | } |
| 1241 | |
| 1242 | /* on uplink TBF we get the downlink TBF to be assigned. */ |
| 1243 | if (direction == GPRS_RLCMAC_UL_TBF) { |
| 1244 | /* be sure to check first, if contention resolution is done, |
| 1245 | * otherwise we cannot send the assignment yet */ |
| 1246 | if (!dir.ul.contention_resolution_done) { |
| 1247 | LOGP(DRLCMAC, LOGL_DEBUG, "Cannot assign DL TBF now, " |
| 1248 | "because contention resolution is not " |
| 1249 | "finished.\n"); |
| 1250 | return NULL; |
| 1251 | } |
| 1252 | #warning "THIS should probably go over the IMSI too" |
Holger Hans Peter Freyther | 474685e | 2013-10-27 17:01:14 +0100 | [diff] [blame] | 1253 | new_tbf = bts->tbf_by_tlli(m_tlli, GPRS_RLCMAC_DL_TBF); |
Holger Hans Peter Freyther | 2db7e7e | 2013-10-26 20:45:35 +0200 | [diff] [blame] | 1254 | } else |
| 1255 | new_tbf = this; |
| 1256 | if (!new_tbf) { |
| 1257 | LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink " |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1258 | "assignment at uplink %s, but there is no downlink " |
| 1259 | "TBF\n", tbf_name(this)); |
Holger Hans Peter Freyther | 2db7e7e | 2013-10-26 20:45:35 +0200 | [diff] [blame] | 1260 | dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1261 | return NULL; |
| 1262 | } |
| 1263 | |
| 1264 | msg = msgb_alloc(23, "rlcmac_dl_ass"); |
| 1265 | if (!msg) |
| 1266 | return NULL; |
| 1267 | bitvec *ass_vec = bitvec_alloc(23); |
| 1268 | if (!ass_vec) { |
| 1269 | msgb_free(msg); |
| 1270 | return NULL; |
| 1271 | } |
| 1272 | bitvec_unhex(ass_vec, |
| 1273 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Holger Hans Peter Freyther | 474685e | 2013-10-27 17:01:14 +0100 | [diff] [blame] | 1274 | LOGP(DRLCMAC, LOGL_INFO, "%s start Packet Downlink Assignment (PACCH)\n", tbf_name(new_tbf)); |
Holger Hans Peter Freyther | 2db7e7e | 2013-10-26 20:45:35 +0200 | [diff] [blame] | 1275 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1276 | Encoding::write_packet_downlink_assignment(mac_control_block, m_tfi, |
Holger Hans Peter Freyther | 2db7e7e | 2013-10-26 20:45:35 +0200 | [diff] [blame] | 1277 | (direction == GPRS_RLCMAC_DL_TBF), new_tbf, |
| 1278 | poll_ass_dl, bts_data()->alpha, bts_data()->gamma, -1, 0); |
| 1279 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n"); |
| 1280 | encode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
| 1281 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 1282 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Downlink Assignment -------------------------\n"); |
| 1283 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
| 1284 | bitvec_free(ass_vec); |
| 1285 | talloc_free(mac_control_block); |
| 1286 | |
| 1287 | if (poll_ass_dl) { |
| 1288 | poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1289 | poll_fn = (fn + 13) % 2715648; |
| 1290 | dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK; |
| 1291 | } else { |
| 1292 | dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE; |
| 1293 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 1294 | tbf_assign_control_ts(new_tbf); |
| 1295 | /* stop pending assignment timer */ |
| 1296 | new_tbf->stop_timer(); |
| 1297 | |
| 1298 | } |
| 1299 | debug_diagram(bts, diag, "send DL-ASS"); |
| 1300 | |
| 1301 | return msg; |
| 1302 | } |
| 1303 | |
Holger Hans Peter Freyther | ae03f22 | 2013-10-26 21:20:51 +0200 | [diff] [blame] | 1304 | struct msgb *gprs_rlcmac_tbf::create_ul_ass(uint32_t fn) |
| 1305 | { |
| 1306 | struct msgb *msg; |
| 1307 | struct gprs_rlcmac_tbf *new_tbf; |
| 1308 | |
| 1309 | #if POLLING_ASSIGNMENT_UL == 1 |
| 1310 | if (poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 1311 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1312 | "sheduled for %s, so we must wait for uplink " |
| 1313 | "assignment...\n", tbf_name(this)); |
Holger Hans Peter Freyther | ae03f22 | 2013-10-26 21:20:51 +0200 | [diff] [blame] | 1314 | return NULL; |
| 1315 | } |
Holger Hans Peter Freyther | ec80f82 | 2013-10-27 13:44:37 +0100 | [diff] [blame] | 1316 | if (bts->sba()->find(trx->trx_no, control_ts, (fn + 13) % 2715648)) { |
Holger Hans Peter Freyther | ae03f22 | 2013-10-26 21:20:51 +0200 | [diff] [blame] | 1317 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already scheduled for " |
| 1318 | "single block allocation...\n"); |
| 1319 | return NULL; |
| 1320 | } |
| 1321 | #endif |
| 1322 | |
| 1323 | /* on down TBF we get the uplink TBF to be assigned. */ |
| 1324 | #warning "Probably want to find by IMSI too" |
| 1325 | if (direction == GPRS_RLCMAC_DL_TBF) |
Holger Hans Peter Freyther | 474685e | 2013-10-27 17:01:14 +0100 | [diff] [blame] | 1326 | new_tbf = bts->tbf_by_tlli(m_tlli, GPRS_RLCMAC_UL_TBF); |
Holger Hans Peter Freyther | ae03f22 | 2013-10-26 21:20:51 +0200 | [diff] [blame] | 1327 | else |
| 1328 | new_tbf = this; |
| 1329 | |
| 1330 | if (!new_tbf) { |
| 1331 | LOGP(DRLCMACUL, LOGL_ERROR, "We have a schedule for uplink " |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1332 | "assignment at downlink %s, but there is no uplink " |
| 1333 | "TBF\n", tbf_name(this)); |
Holger Hans Peter Freyther | ae03f22 | 2013-10-26 21:20:51 +0200 | [diff] [blame] | 1334 | ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 1335 | return NULL; |
| 1336 | } |
| 1337 | |
| 1338 | msg = msgb_alloc(23, "rlcmac_ul_ass"); |
| 1339 | if (!msg) |
| 1340 | return NULL; |
Holger Hans Peter Freyther | 474685e | 2013-10-27 17:01:14 +0100 | [diff] [blame] | 1341 | LOGP(DRLCMAC, LOGL_INFO, "%ss start Packet Uplink Assignment (PACCH)\n", tbf_name(new_tbf)); |
Holger Hans Peter Freyther | ae03f22 | 2013-10-26 21:20:51 +0200 | [diff] [blame] | 1342 | bitvec *ass_vec = bitvec_alloc(23); |
| 1343 | if (!ass_vec) { |
| 1344 | msgb_free(msg); |
| 1345 | return NULL; |
| 1346 | } |
| 1347 | bitvec_unhex(ass_vec, |
| 1348 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1349 | Encoding::write_packet_uplink_assignment(bts_data(), ass_vec, m_tfi, |
Holger Hans Peter Freyther | 474685e | 2013-10-27 17:01:14 +0100 | [diff] [blame] | 1350 | (direction == GPRS_RLCMAC_DL_TBF), m_tlli, |
| 1351 | m_tlli_valid, new_tbf, POLLING_ASSIGNMENT_UL, bts_data()->alpha, |
Holger Hans Peter Freyther | ae03f22 | 2013-10-26 21:20:51 +0200 | [diff] [blame] | 1352 | bts_data()->gamma, -1); |
| 1353 | bitvec_pack(ass_vec, msgb_put(msg, 23)); |
| 1354 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
| 1355 | LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Uplink Assignment +++++++++++++++++++++++++\n"); |
| 1356 | decode_gsm_rlcmac_downlink(ass_vec, mac_control_block); |
| 1357 | LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| 1358 | LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Uplink Assignment -------------------------\n"); |
| 1359 | bitvec_free(ass_vec); |
| 1360 | talloc_free(mac_control_block); |
| 1361 | |
| 1362 | #if POLLING_ASSIGNMENT_UL == 1 |
| 1363 | poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1364 | poll_fn = (fn + 13) % 2715648; |
| 1365 | ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK; |
| 1366 | #else |
| 1367 | ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE; |
| 1368 | tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW); |
| 1369 | tbf_assign_control_ts(new_tbf); |
| 1370 | #endif |
| 1371 | debug_diagram(bts, diag, "send UL-ASS"); |
| 1372 | |
| 1373 | return msg; |
| 1374 | } |
| 1375 | |
Holger Hans Peter Freyther | 46bcb8d | 2013-10-26 21:04:28 +0200 | [diff] [blame] | 1376 | struct msgb *gprs_rlcmac_tbf::create_ul_ack(uint32_t fn) |
| 1377 | { |
| 1378 | int final = (state_is(GPRS_RLCMAC_FINISHED)); |
| 1379 | struct msgb *msg; |
| 1380 | |
| 1381 | if (final) { |
| 1382 | if (poll_state != GPRS_RLCMAC_POLL_NONE) { |
| 1383 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1384 | "sheduled for %s, so we must wait for " |
| 1385 | "final uplink ack...\n", tbf_name(this)); |
Holger Hans Peter Freyther | 46bcb8d | 2013-10-26 21:04:28 +0200 | [diff] [blame] | 1386 | return NULL; |
| 1387 | } |
Holger Hans Peter Freyther | ec80f82 | 2013-10-27 13:44:37 +0100 | [diff] [blame] | 1388 | if (bts->sba()->find(trx->trx_no, control_ts, (fn + 13) % 2715648)) { |
Holger Hans Peter Freyther | 46bcb8d | 2013-10-26 21:04:28 +0200 | [diff] [blame] | 1389 | LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already " |
| 1390 | "scheduled for single block allocation...\n"); |
| 1391 | return NULL; |
| 1392 | } |
| 1393 | } |
| 1394 | |
| 1395 | msg = msgb_alloc(23, "rlcmac_ul_ack"); |
| 1396 | if (!msg) |
| 1397 | return NULL; |
| 1398 | bitvec *ack_vec = bitvec_alloc(23); |
| 1399 | if (!ack_vec) { |
| 1400 | msgb_free(msg); |
| 1401 | return NULL; |
| 1402 | } |
| 1403 | bitvec_unhex(ack_vec, |
| 1404 | "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| 1405 | RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t); |
| 1406 | Encoding::write_packet_uplink_ack(bts_data(), mac_control_block, this, final); |
| 1407 | encode_gsm_rlcmac_downlink(ack_vec, mac_control_block); |
| 1408 | bitvec_pack(ack_vec, msgb_put(msg, 23)); |
| 1409 | bitvec_free(ack_vec); |
| 1410 | talloc_free(mac_control_block); |
| 1411 | |
| 1412 | /* now we must set this flag, so we are allowed to assign downlink |
Holger Hans Peter Freyther | 22b3119 | 2013-10-26 21:07:45 +0200 | [diff] [blame] | 1413 | * TBF on PACCH. it is only allowed when TLLI is acknowledged. */ |
Holger Hans Peter Freyther | 46bcb8d | 2013-10-26 21:04:28 +0200 | [diff] [blame] | 1414 | dir.ul.contention_resolution_done = 1; |
| 1415 | |
| 1416 | if (final) { |
| 1417 | poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 1418 | poll_fn = (fn + 13) % 2715648; |
| 1419 | /* waiting for final acknowledge */ |
| 1420 | ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK; |
| 1421 | dir.ul.final_ack_sent = 1; |
| 1422 | } else |
| 1423 | ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE; |
| 1424 | debug_diagram(bts->bts, diag, "send UL-ACK"); |
| 1425 | |
| 1426 | return msg; |
| 1427 | } |
| 1428 | |
Holger Hans Peter Freyther | 3dc56a3 | 2013-10-26 21:38:30 +0200 | [diff] [blame] | 1429 | int gprs_rlcmac_tbf::snd_dl_ack(uint8_t final, uint8_t ssn, uint8_t *rbb) |
| 1430 | { |
| 1431 | char show_rbb[65], show_v_b[RLC_MAX_SNS + 1]; |
| 1432 | uint16_t mod_sns = sns - 1; |
| 1433 | uint16_t mod_sns_half = (sns >> 1) - 1; |
| 1434 | int i; /* must be signed */ |
| 1435 | int16_t dist; /* must be signed */ |
| 1436 | uint8_t bit; |
| 1437 | uint16_t bsn; |
| 1438 | struct msgb *msg; |
| 1439 | uint16_t lost = 0, received = 0; |
| 1440 | |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1441 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this)); |
Holger Hans Peter Freyther | 3dc56a3 | 2013-10-26 21:38:30 +0200 | [diff] [blame] | 1442 | |
| 1443 | if (!final) { |
| 1444 | /* show received array in debug (bit 64..1) */ |
| 1445 | for (i = 63; i >= 0; i--) { |
| 1446 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1447 | show_rbb[i] = (bit) ? '1' : 'o'; |
| 1448 | } |
| 1449 | show_rbb[64] = '\0'; |
| 1450 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
| 1451 | "(BSN=%d) 1=ACK o=NACK\n", (ssn - 64) & mod_sns, |
| 1452 | show_rbb, (ssn - 1) & mod_sns); |
| 1453 | |
| 1454 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 1455 | /* calculate distance of ssn from V(S) */ |
| 1456 | dist = (dir.dl.v_s - ssn) & mod_sns; |
| 1457 | /* check if distance is less than distance V(A)..V(S) */ |
| 1458 | if (dist >= ((dir.dl.v_s - dir.dl.v_a) & mod_sns)) { |
| 1459 | /* this might happpen, if the downlink assignment |
| 1460 | * was not received by ms and the ack refers |
| 1461 | * to previous TBF |
| 1462 | * FIXME: we should implement polling for |
| 1463 | * control ack!*/ |
| 1464 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1465 | "V(A)..V(S) range %s Free TBF!\n", tbf_name(this)); |
Holger Hans Peter Freyther | 3dc56a3 | 2013-10-26 21:38:30 +0200 | [diff] [blame] | 1466 | return 1; /* indicate to free TBF */ |
| 1467 | } |
| 1468 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
| 1469 | for (i = 63, bsn = (ssn - 1) & mod_sns; |
| 1470 | i >= 0 && bsn != ((dir.dl.v_a - 1) & mod_sns); |
| 1471 | i--, bsn = (bsn - 1) & mod_sns) { |
| 1472 | bit = (rbb[i >> 3] >> (7 - (i&7))) & 1; |
| 1473 | if (bit) { |
| 1474 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1475 | "ack for BSN=%d\n", bsn); |
| 1476 | if (dir.dl.v_b[bsn & mod_sns_half] |
| 1477 | != 'A') |
| 1478 | received++; |
| 1479 | dir.dl.v_b[bsn & mod_sns_half] = 'A'; |
| 1480 | } else { |
| 1481 | LOGP(DRLCMACDL, LOGL_DEBUG, "- got " |
| 1482 | "NACK for BSN=%d\n", bsn); |
| 1483 | dir.dl.v_b[bsn & mod_sns_half] = 'N'; |
| 1484 | lost++; |
| 1485 | } |
| 1486 | } |
| 1487 | /* report lost and received packets */ |
| 1488 | gprs_rlcmac_received_lost(this, received, lost); |
| 1489 | |
| 1490 | /* raise V(A), if possible */ |
| 1491 | for (i = 0, bsn = dir.dl.v_a; bsn != dir.dl.v_s; |
| 1492 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1493 | if (dir.dl.v_b[bsn & mod_sns_half] == 'A') { |
| 1494 | dir.dl.v_b[bsn & mod_sns_half] = 'I'; |
| 1495 | /* mark invalid */ |
| 1496 | dir.dl.v_a = (dir.dl.v_a + 1) |
| 1497 | & mod_sns; |
| 1498 | } else |
| 1499 | break; |
| 1500 | } |
| 1501 | |
| 1502 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 1503 | for (i = 0, bsn = dir.dl.v_a; bsn != dir.dl.v_s; |
| 1504 | i++, bsn = (bsn + 1) & mod_sns) { |
| 1505 | show_v_b[i] = dir.dl.v_b[bsn & mod_sns_half]; |
| 1506 | if (show_v_b[i] == 0) |
| 1507 | show_v_b[i] = ' '; |
| 1508 | } |
| 1509 | show_v_b[i] = '\0'; |
| 1510 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 1511 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 1512 | "X=Resend-Unacked\n", dir.dl.v_a, show_v_b, |
| 1513 | (dir.dl.v_s - 1) & mod_sns); |
| 1514 | |
| 1515 | if (state_is(GPRS_RLCMAC_FINISHED) |
| 1516 | && dir.dl.v_s == dir.dl.v_a) { |
| 1517 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 1518 | "all blocks, but without final ack " |
| 1519 | "inidcation (don't worry)\n"); |
| 1520 | } |
| 1521 | return 0; |
| 1522 | } |
| 1523 | |
| 1524 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 1525 | debug_diagram(ts, diag, "got Final ACK"); |
| 1526 | /* range V(A)..V(S)-1 */ |
| 1527 | for (bsn = dir.dl.v_a; bsn != dir.dl.v_s; |
| 1528 | bsn = (bsn + 1) & mod_sns) { |
| 1529 | if (dir.dl.v_b[bsn & mod_sns_half] != 'A') |
| 1530 | received++; |
| 1531 | } |
| 1532 | |
| 1533 | /* report all outstanding packets as received */ |
| 1534 | gprs_rlcmac_received_lost(this, received, lost); |
| 1535 | |
| 1536 | /* check for LLC PDU in the LLC Queue */ |
| 1537 | msg = llc_dequeue(gprs_bssgp_pcu_current_bctx()); |
| 1538 | if (!msg) { |
| 1539 | /* no message, start T3193, change state to RELEASE */ |
| 1540 | LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we " |
| 1541 | "release.\n"); |
| 1542 | /* start T3193 */ |
| 1543 | debug_diagram(bts, diag, "start T3193"); |
| 1544 | tbf_timer_start(this, 3193, |
| 1545 | bts_data()->t3193_msec / 1000, |
| 1546 | (bts_data()->t3193_msec % 1000) * 1000); |
| 1547 | tbf_new_state(this, GPRS_RLCMAC_WAIT_RELEASE); |
| 1548 | |
| 1549 | return 0; |
| 1550 | } |
| 1551 | #warning "Copy and paste on the sender path" |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 1552 | m_llc.update_frame(msg); |
Holger Hans Peter Freyther | 3dc56a3 | 2013-10-26 21:38:30 +0200 | [diff] [blame] | 1553 | msgb_free(msg); |
| 1554 | |
| 1555 | /* we have a message, so we trigger downlink assignment, and there |
| 1556 | * set the state to ASSIGN. also we set old_downlink, because we |
| 1557 | * re-use this tbf. */ |
| 1558 | LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, " |
| 1559 | "because another LLC PDU has arrived in between\n"); |
| 1560 | memset(&dir.dl, 0, sizeof(dir.dl)); /* reset RLC states */ |
| 1561 | state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; /* keep TO flags */ |
| 1562 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
| 1563 | update(); |
| 1564 | bts->trigger_dl_ass(this, this, NULL); |
| 1565 | return 0; |
| 1566 | } |
| 1567 | |
Holger Hans Peter Freyther | 964ddb6 | 2013-10-16 17:53:23 +0200 | [diff] [blame] | 1568 | void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_trx *trx) |
| 1569 | { |
| 1570 | for (uint8_t tfi = 0; tfi < 32; tfi++) { |
| 1571 | struct gprs_rlcmac_tbf *tbf; |
| 1572 | |
| 1573 | tbf = trx->ul_tbf[tfi]; |
| 1574 | if (tbf) |
| 1575 | tbf_free(tbf); |
| 1576 | tbf = trx->dl_tbf[tfi]; |
| 1577 | if (tbf) |
| 1578 | tbf_free(tbf); |
| 1579 | } |
| 1580 | } |
Holger Hans Peter Freyther | 4f6a4e5d | 2013-10-16 17:58:46 +0200 | [diff] [blame] | 1581 | |
| 1582 | void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_pdch *pdch) |
| 1583 | { |
| 1584 | for (uint8_t tfi = 0; tfi < 32; tfi++) { |
| 1585 | struct gprs_rlcmac_tbf *tbf; |
| 1586 | |
| 1587 | tbf = pdch->ul_tbf[tfi]; |
| 1588 | if (tbf) |
| 1589 | tbf_free(tbf); |
| 1590 | tbf = pdch->dl_tbf[tfi]; |
| 1591 | if (tbf) |
| 1592 | tbf_free(tbf); |
| 1593 | } |
| 1594 | } |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 1595 | |
Holger Hans Peter Freyther | 474685e | 2013-10-27 17:01:14 +0100 | [diff] [blame] | 1596 | void gprs_rlcmac_tbf::tlli_mark_valid() |
| 1597 | { |
| 1598 | m_tlli_valid = true; |
| 1599 | } |
| 1600 | |
| 1601 | void gprs_rlcmac_tbf::update_tlli(uint32_t tlli) |
| 1602 | { |
| 1603 | if (tlli == m_tlli) |
| 1604 | return; |
| 1605 | |
Holger Hans Peter Freyther | b809866 | 2013-10-30 14:50:17 +0100 | [diff] [blame] | 1606 | bool changedUl = false; |
| 1607 | |
| 1608 | /* |
| 1609 | * During a Routing Area Update (due the assignment of a new |
| 1610 | * P-TMSI) the tlli can change. We notice this when receiving |
| 1611 | * a PACKET CONTROL ACK. |
| 1612 | * When we get a TLLI change on the DL we will look if there |
| 1613 | * is a UL TBF and change the tlli there as well. |
| 1614 | * |
| 1615 | * TODO: There could be multiple DL and UL TBFs and we should |
| 1616 | * have a proper way to link all the related TBFs so we can do |
| 1617 | * a group update. |
| 1618 | */ |
| 1619 | if (m_tlli_valid && direction == GPRS_RLCMAC_DL_TBF) { |
| 1620 | gprs_rlcmac_tbf *ul_tbf; |
| 1621 | ul_tbf = bts->tbf_by_tlli(m_tlli, GPRS_RLCMAC_UL_TBF); |
| 1622 | |
| 1623 | if (ul_tbf) { |
| 1624 | ul_tbf->m_tlli = tlli; |
| 1625 | changedUl = true; |
| 1626 | } |
| 1627 | } |
| 1628 | |
Holger Hans Peter Freyther | bc1626e | 2013-10-30 19:50:49 +0100 | [diff] [blame] | 1629 | /* update the timing advance for the new tlli */ |
| 1630 | bts->timing_advance()->update(m_tlli, tlli, ta); |
| 1631 | |
Holger Hans Peter Freyther | b809866 | 2013-10-30 14:50:17 +0100 | [diff] [blame] | 1632 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 1633 | "%s changing tlli from TLLI=0x%08x TLLI=0x%08x ul_changed=%d\n", |
| 1634 | tbf_name(this), m_tlli, tlli, changedUl); |
Holger Hans Peter Freyther | 474685e | 2013-10-27 17:01:14 +0100 | [diff] [blame] | 1635 | m_tlli = tlli; |
| 1636 | } |
| 1637 | |
Holger Hans Peter Freyther | 77e0597 | 2013-11-06 19:16:43 +0100 | [diff] [blame] | 1638 | int gprs_rlcmac_tbf::rcv_data_block_acknowledged(const uint8_t *data, size_t len, int8_t rssi) |
| 1639 | { |
| 1640 | uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index; |
| 1641 | struct rlc_ul_header *rh = (struct rlc_ul_header *)data; |
| 1642 | int rc; |
| 1643 | |
| 1644 | this->state_flags |= (1 << GPRS_RLCMAC_FLAG_UL_DATA); |
| 1645 | |
| 1646 | LOGP(DRLCMACUL, LOGL_DEBUG, "UL DATA TFI=%d received (V(Q)=%d .. " |
| 1647 | "V(R)=%d)\n", rh->tfi, this->dir.ul.v_q, this->dir.ul.v_r); |
| 1648 | |
| 1649 | /* process RSSI */ |
| 1650 | gprs_rlcmac_rssi(this, rssi); |
| 1651 | |
| 1652 | /* get TLLI */ |
| 1653 | if (!this->is_tlli_valid()) { |
| 1654 | struct gprs_rlcmac_tbf *dl_tbf, *ul_tbf; |
| 1655 | uint32_t tlli; |
| 1656 | |
| 1657 | /* no TLLI yet */ |
| 1658 | if (!rh->ti) { |
| 1659 | LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TFI=%d without " |
| 1660 | "TLLI, but no TLLI received yet\n", rh->tfi); |
| 1661 | return 0; |
| 1662 | } |
| 1663 | rc = Decoding::tlli_from_ul_data(data, len, &tlli); |
| 1664 | if (rc) { |
| 1665 | bts->decode_error(); |
| 1666 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
| 1667 | "of UL DATA TFI=%d.\n", rh->tfi); |
| 1668 | return 0; |
| 1669 | } |
| 1670 | this->update_tlli(tlli); |
| 1671 | LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of " |
| 1672 | "UL DATA TFI=%d.\n", this->tlli(), rh->tfi); |
| 1673 | if ((dl_tbf = bts->tbf_by_tlli(this->tlli(), GPRS_RLCMAC_DL_TBF))) { |
| 1674 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 1675 | "TLLI=0x%08x while %s still exists. " |
| 1676 | "Killing pending DL TBF\n", this->tlli(), |
| 1677 | tbf_name(dl_tbf)); |
| 1678 | tbf_free(dl_tbf); |
| 1679 | } |
| 1680 | /* tbf_by_tlli will not find your TLLI, because it is not |
| 1681 | * yet marked valid */ |
| 1682 | if ((ul_tbf = bts->tbf_by_tlli(this->tlli(), GPRS_RLCMAC_UL_TBF))) { |
| 1683 | LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from " |
| 1684 | "TLLI=0x%08x while %s still exists. " |
| 1685 | "Killing pending UL TBF\n", this->tlli(), |
| 1686 | tbf_name(ul_tbf)); |
| 1687 | tbf_free(ul_tbf); |
| 1688 | } |
| 1689 | /* mark TLLI valid now */ |
| 1690 | this->tlli_mark_valid(); |
| 1691 | /* store current timing advance */ |
| 1692 | bts->timing_advance()->remember(this->tlli(), this->ta); |
| 1693 | /* already have TLLI, but we stille get another one */ |
| 1694 | } else if (rh->ti) { |
| 1695 | uint32_t tlli; |
| 1696 | rc = Decoding::tlli_from_ul_data(data, len, &tlli); |
| 1697 | if (rc) { |
| 1698 | LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI " |
| 1699 | "of UL DATA TFI=%d.\n", rh->tfi); |
| 1700 | return 0; |
| 1701 | } |
| 1702 | if (tlli != this->tlli()) { |
| 1703 | LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL " |
| 1704 | "DATA TFI=%d. (Ignoring due to contention " |
| 1705 | "resolution)\n", rh->tfi); |
| 1706 | return 0; |
| 1707 | } |
| 1708 | } |
| 1709 | |
| 1710 | mod_sns = this->sns - 1; |
| 1711 | mod_sns_half = (this->sns >> 1) - 1; |
| 1712 | |
| 1713 | /* restart T3169 */ |
| 1714 | tbf_timer_start(this, 3169, bts_data()->t3169, 0); |
| 1715 | |
| 1716 | /* Increment RX-counter */ |
| 1717 | this->dir.ul.rx_counter++; |
| 1718 | |
| 1719 | /* current block relative to lowest unreceived block */ |
| 1720 | offset_v_q = (rh->bsn - this->dir.ul.v_q) & mod_sns; |
| 1721 | /* If out of window (may happen if blocks below V(Q) are received |
| 1722 | * again. */ |
| 1723 | if (offset_v_q >= this->ws) { |
| 1724 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window " |
| 1725 | "%d..%d (it's normal)\n", rh->bsn, this->dir.ul.v_q, |
| 1726 | (this->dir.ul.v_q + this->ws - 1) & mod_sns); |
| 1727 | return 0; |
| 1728 | } |
| 1729 | /* Write block to buffer and set receive state array. */ |
| 1730 | index = rh->bsn & mod_sns_half; /* memory index of block */ |
| 1731 | memcpy(this->rlc_block[index], data, len); /* Copy block. */ |
| 1732 | this->rlc_block_len[index] = len; |
| 1733 | this->dir.ul.v_n[index] = 'R'; /* Mark received block. */ |
| 1734 | LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n", |
| 1735 | rh->bsn, this->dir.ul.v_q, |
| 1736 | (this->dir.ul.v_q + this->ws - 1) & mod_sns); |
| 1737 | /* Raise V(R) to highest received sequence number not received. */ |
| 1738 | offset_v_r = (rh->bsn + 1 - this->dir.ul.v_r) & mod_sns; |
| 1739 | if (offset_v_r < (this->sns >> 1)) { /* Positive offset, so raise. */ |
| 1740 | while (offset_v_r--) { |
| 1741 | if (offset_v_r) /* all except the received block */ |
| 1742 | this->dir.ul.v_n[this->dir.ul.v_r & mod_sns_half] |
| 1743 | = 'N'; /* Mark block as not received */ |
| 1744 | this->dir.ul.v_r = (this->dir.ul.v_r + 1) & mod_sns; |
| 1745 | /* Inc V(R). */ |
| 1746 | } |
| 1747 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n", |
| 1748 | this->dir.ul.v_r); |
| 1749 | } |
| 1750 | |
| 1751 | #warning "Move to TBF and remove the index side effect.." |
| 1752 | /* Raise V(Q) if possible, and retrieve LLC frames from blocks. |
| 1753 | * This is looped until there is a gap (non received block) or |
| 1754 | * the window is empty.*/ |
| 1755 | while (this->dir.ul.v_q != this->dir.ul.v_r && this->dir.ul.v_n[ |
| 1756 | (index = this->dir.ul.v_q & mod_sns_half)] == 'R') { |
| 1757 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising " |
| 1758 | "V(Q) to %d\n", this->dir.ul.v_q, |
| 1759 | (this->dir.ul.v_q + 1) & mod_sns); |
| 1760 | /* get LLC data from block */ |
| 1761 | this->assemble_forward_llc(this->rlc_block[index], this->rlc_block_len[index]); |
| 1762 | /* raise V(Q), because block already received */ |
| 1763 | this->dir.ul.v_q = (this->dir.ul.v_q + 1) & mod_sns; |
| 1764 | } |
| 1765 | |
| 1766 | /* Check CV of last frame in buffer */ |
| 1767 | if (this->state_is(GPRS_RLCMAC_FLOW) /* still in flow state */ |
| 1768 | && this->dir.ul.v_q == this->dir.ul.v_r) { /* if complete */ |
| 1769 | struct rlc_ul_header *last_rh = (struct rlc_ul_header *) |
| 1770 | this->rlc_block[(this->dir.ul.v_r - 1) & mod_sns_half]; |
| 1771 | LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, " |
| 1772 | "last block: BSN=%d CV=%d\n", last_rh->bsn, |
| 1773 | last_rh->cv); |
| 1774 | if (last_rh->cv == 0) { |
| 1775 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL " |
| 1776 | "TBF\n"); |
| 1777 | tbf_new_state(this, GPRS_RLCMAC_FINISHED); |
| 1778 | /* Reset N3103 counter. */ |
| 1779 | this->dir.ul.n3103 = 0; |
| 1780 | } |
| 1781 | } |
| 1782 | |
| 1783 | /* If TLLI is included or if we received half of the window, we send |
| 1784 | * an ack/nack */ |
| 1785 | if (rh->si || rh->ti || this->state_is(GPRS_RLCMAC_FINISHED) |
| 1786 | || (this->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
| 1787 | if (rh->si) { |
| 1788 | LOGP(DRLCMACUL, LOGL_NOTICE, "- Scheduling Ack/Nack, " |
| 1789 | "because MS is stalled.\n"); |
| 1790 | } |
| 1791 | if (rh->ti) { |
| 1792 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
| 1793 | "because TLLI is included.\n"); |
| 1794 | } |
| 1795 | if (this->state_is(GPRS_RLCMAC_FINISHED)) { |
| 1796 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
| 1797 | "because last block has CV==0.\n"); |
| 1798 | } |
| 1799 | if ((this->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) { |
| 1800 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, " |
| 1801 | "because %d frames received.\n", |
| 1802 | SEND_ACK_AFTER_FRAMES); |
| 1803 | } |
| 1804 | if (this->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) { |
| 1805 | #ifdef DEBUG_DIAGRAM |
| 1806 | if (rh->si) |
| 1807 | debug_diagram(bts->bts, this->diag, "sched UL-ACK stall"); |
| 1808 | if (rh->ti) |
| 1809 | debug_diagram(bts->bts, this->diag, "sched UL-ACK TLLI"); |
| 1810 | if (this->state_is(GPRS_RLCMAC_FINISHED)) |
| 1811 | debug_diagram(bts->bts, this->diag, "sched UL-ACK CV==0"); |
| 1812 | if ((this->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) |
| 1813 | debug_diagram(bts->bts, this->diag, "sched UL-ACK n=%d", |
| 1814 | this->dir.ul.rx_counter); |
| 1815 | #endif |
| 1816 | /* trigger sending at next RTS */ |
| 1817 | this->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK; |
| 1818 | } else { |
| 1819 | /* already triggered */ |
| 1820 | LOGP(DRLCMACUL, LOGL_DEBUG, "- Sending Ack/Nack is " |
| 1821 | "already triggered, don't schedule!\n"); |
| 1822 | } |
| 1823 | } |
| 1824 | |
| 1825 | return 0; |
| 1826 | } |
| 1827 | |
Holger Hans Peter Freyther | 9948514 | 2013-11-06 20:08:42 +0100 | [diff] [blame] | 1828 | /* Send Uplink unit-data to SGSN. */ |
| 1829 | int gprs_rlcmac_tbf::snd_ul_ud() |
| 1830 | { |
| 1831 | uint8_t qos_profile[3]; |
| 1832 | struct msgb *llc_pdu; |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1833 | unsigned msg_len = NS_HDR_LEN + BSSGP_HDR_LEN + m_llc.index; |
Holger Hans Peter Freyther | 9948514 | 2013-11-06 20:08:42 +0100 | [diff] [blame] | 1834 | struct bssgp_bvc_ctx *bctx = gprs_bssgp_pcu_current_bctx(); |
| 1835 | |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1836 | LOGP(DBSSGP, LOGL_INFO, "LLC [PCU -> SGSN] %s len=%d\n", tbf_name(this), m_llc.index); |
Holger Hans Peter Freyther | 9948514 | 2013-11-06 20:08:42 +0100 | [diff] [blame] | 1837 | if (!bctx) { |
| 1838 | LOGP(DBSSGP, LOGL_ERROR, "No bctx\n"); |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 1839 | m_llc.reset_frame_space(); |
Holger Hans Peter Freyther | 9948514 | 2013-11-06 20:08:42 +0100 | [diff] [blame] | 1840 | return -EIO; |
| 1841 | } |
| 1842 | |
| 1843 | llc_pdu = msgb_alloc_headroom(msg_len, msg_len,"llc_pdu"); |
Holger Hans Peter Freyther | 28e5378 | 2013-11-06 20:23:56 +0100 | [diff] [blame] | 1844 | uint8_t *buf = msgb_push(llc_pdu, TL16V_GROSS_LEN(sizeof(uint8_t)*m_llc.index)); |
| 1845 | tl16v_put(buf, BSSGP_IE_LLC_PDU, sizeof(uint8_t)*m_llc.index, m_llc.frame); |
Holger Hans Peter Freyther | 9948514 | 2013-11-06 20:08:42 +0100 | [diff] [blame] | 1846 | qos_profile[0] = QOS_PROFILE >> 16; |
| 1847 | qos_profile[1] = QOS_PROFILE >> 8; |
| 1848 | qos_profile[2] = QOS_PROFILE; |
| 1849 | bssgp_tx_ul_ud(bctx, tlli(), qos_profile, llc_pdu); |
| 1850 | |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 1851 | m_llc.reset_frame_space(); |
Holger Hans Peter Freyther | 9948514 | 2013-11-06 20:08:42 +0100 | [diff] [blame] | 1852 | return 0; |
| 1853 | } |
| 1854 | |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 1855 | const char *tbf_name(gprs_rlcmac_tbf *tbf) |
| 1856 | { |
| 1857 | static char buf[40]; |
| 1858 | snprintf(buf, sizeof(buf), "TBF(TFI=%d TLLI=0x%08x DIR=%s)", |
Holger Hans Peter Freyther | 34f6e5e | 2013-10-27 20:31:47 +0100 | [diff] [blame] | 1859 | tbf->m_tfi, tbf->m_tlli, |
Holger Hans Peter Freyther | bd449f5 | 2013-10-27 16:39:36 +0100 | [diff] [blame] | 1860 | tbf->direction == GPRS_RLCMAC_UL_TBF ? "UL" : "DL"); |
| 1861 | buf[sizeof(buf) - 1] = '\0'; |
| 1862 | return buf; |
| 1863 | } |
Holger Hans Peter Freyther | 758dc12 | 2013-11-06 20:39:45 +0100 | [diff] [blame^] | 1864 | |
| 1865 | /* reset LLC frame */ |
| 1866 | void gprs_llc::reset() |
| 1867 | { |
| 1868 | index = 0; |
| 1869 | length = 0; |
| 1870 | } |
| 1871 | |
| 1872 | void gprs_llc::reset_frame_space() |
| 1873 | { |
| 1874 | index = 0; |
| 1875 | } |
| 1876 | |
| 1877 | void gprs_llc::enqueue(struct msgb *llc_msg) |
| 1878 | { |
| 1879 | msgb_enqueue(&queue, llc_msg); |
| 1880 | } |
| 1881 | |
| 1882 | void gprs_llc::put_frame(const uint8_t *data, size_t len) |
| 1883 | { |
| 1884 | memcpy(frame, data, len); |
| 1885 | length = len; |
| 1886 | } |
| 1887 | |
| 1888 | void gprs_llc::clear(BTS *bts) |
| 1889 | { |
| 1890 | struct msgb *msg; |
| 1891 | |
| 1892 | while ((msg = msgb_dequeue(&queue))) { |
| 1893 | bts->dropped_frame(); |
| 1894 | msgb_free(msg); |
| 1895 | } |
| 1896 | } |
| 1897 | |
| 1898 | void gprs_llc::init() |
| 1899 | { |
| 1900 | INIT_LLIST_HEAD(&queue); |
| 1901 | } |
| 1902 | |
| 1903 | struct msgb *gprs_llc::dequeue() |
| 1904 | { |
| 1905 | return msgb_dequeue(&queue); |
| 1906 | } |
| 1907 | |
| 1908 | void gprs_llc::update_frame(struct msgb *msg) |
| 1909 | { |
| 1910 | /* TODO: bounds check */ |
| 1911 | memcpy(frame, msg->data, msg->len); |
| 1912 | length = msg->len; |
| 1913 | } |