Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1 | /* Copied from tbf.cpp |
| 2 | * |
| 3 | * Copyright (C) 2012 Ivan Klyuchnikov |
| 4 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 5 | * Copyright (C) 2013 by Holger Hans Peter Freyther |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version 2 |
| 10 | * of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 20 | */ |
| 21 | |
| 22 | #include <bts.h> |
| 23 | #include <tbf.h> |
| 24 | #include <rlc.h> |
| 25 | #include <gprs_rlcmac.h> |
| 26 | #include <gprs_debug.h> |
| 27 | #include <gprs_bssgp_pcu.h> |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 28 | #include <gprs_codel.h> |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 29 | #include <decoding.h> |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 30 | #include <encoding.h> |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 31 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 32 | #include "pcu_utils.h" |
| 33 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 34 | extern "C" { |
| 35 | #include <osmocom/core/msgb.h> |
| 36 | #include <osmocom/core/talloc.h> |
| 37 | } |
| 38 | |
| 39 | #include <errno.h> |
| 40 | #include <string.h> |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 41 | #include <math.h> |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 42 | |
| 43 | /* After sending these frames, we poll for ack/nack. */ |
| 44 | #define POLL_ACK_AFTER_FRAMES 20 |
| 45 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 46 | extern "C" { |
| 47 | int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, |
| 48 | uint8_t num_frames, uint32_t num_octets); |
| 49 | } |
| 50 | |
| 51 | static inline void tbf_update_ms_class(struct gprs_rlcmac_tbf *tbf, |
| 52 | const uint8_t ms_class) |
| 53 | { |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 54 | if (!tbf->ms_class() && ms_class) |
| 55 | tbf->set_ms_class(ms_class); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 56 | } |
| 57 | |
Jacob Erlbeck | d0261b7 | 2015-04-02 13:58:09 +0200 | [diff] [blame] | 58 | static void llc_timer_cb(void *_tbf) |
| 59 | { |
| 60 | struct gprs_rlcmac_dl_tbf *tbf = (struct gprs_rlcmac_dl_tbf *)_tbf; |
| 61 | |
| 62 | if (tbf->state_is_not(GPRS_RLCMAC_FLOW)) |
| 63 | return; |
| 64 | |
| 65 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 66 | "%s LLC receive timeout, requesting DL ACK\n", tbf_name(tbf)); |
| 67 | |
| 68 | tbf->request_dl_ack(); |
| 69 | } |
| 70 | |
| 71 | void gprs_rlcmac_dl_tbf::cleanup() |
| 72 | { |
| 73 | osmo_timer_del(&m_llc_timer); |
| 74 | } |
| 75 | |
| 76 | void gprs_rlcmac_dl_tbf::start_llc_timer() |
| 77 | { |
| 78 | if (bts_data()->llc_idle_ack_csec > 0) { |
| 79 | struct timeval tv; |
| 80 | |
| 81 | /* TODO: this ought to be within a constructor */ |
| 82 | m_llc_timer.data = this; |
| 83 | m_llc_timer.cb = &llc_timer_cb; |
| 84 | |
| 85 | csecs_to_timeval(bts_data()->llc_idle_ack_csec, &tv); |
| 86 | osmo_timer_schedule(&m_llc_timer, tv.tv_sec, tv.tv_usec); |
| 87 | } |
| 88 | } |
| 89 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 90 | int gprs_rlcmac_dl_tbf::append_data(const uint8_t ms_class, |
| 91 | const uint16_t pdu_delay_csec, |
| 92 | const uint8_t *data, const uint16_t len) |
| 93 | { |
| 94 | LOGP(DRLCMAC, LOGL_INFO, "%s append\n", tbf_name(this)); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 95 | gprs_llc_queue::MetaInfo info; |
| 96 | struct msgb *llc_msg = msgb_alloc(len, "llc_pdu_queue"); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 97 | if (!llc_msg) |
| 98 | return -ENOMEM; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 99 | |
| 100 | gprs_llc_queue::calc_pdu_lifetime(bts, pdu_delay_csec, &info.expire_time); |
| 101 | gettimeofday(&info.recv_time, NULL); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 102 | memcpy(msgb_put(llc_msg, len), data, len); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 103 | llc_queue()->enqueue(llc_msg, &info); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 104 | tbf_update_ms_class(this, ms_class); |
| 105 | start_llc_timer(); |
| 106 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 107 | if (state_is(GPRS_RLCMAC_WAIT_RELEASE)) { |
| 108 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 109 | "%s in WAIT RELEASE state " |
| 110 | "(T3193), so reuse TBF\n", tbf_name(this)); |
| 111 | tbf_update_ms_class(this, ms_class); |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 112 | establish_dl_tbf_on_pacch(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 113 | } |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 118 | static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts, |
| 119 | const char *imsi, |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 120 | const uint32_t tlli, const uint32_t tlli_old, |
| 121 | const uint8_t ms_class, |
Jacob Erlbeck | 86b6f05 | 2015-11-27 15:17:34 +0100 | [diff] [blame] | 122 | const uint8_t egprs_ms_class, |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 123 | struct gprs_rlcmac_dl_tbf **tbf) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 124 | { |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 125 | uint8_t ss; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 126 | int8_t use_trx; |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 127 | uint16_t ta = 0; |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 128 | struct gprs_rlcmac_ul_tbf *ul_tbf = NULL, *old_ul_tbf; |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 129 | struct gprs_rlcmac_dl_tbf *dl_tbf = NULL; |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 130 | GprsMs *ms; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 131 | |
| 132 | /* check for uplink data, so we copy our informations */ |
| 133 | #warning "Do the same look up for IMSI, TLLI and OLD_TLLI" |
| 134 | #warning "Refactor the below lines... into a new method" |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 135 | ms = bts->bts->ms_store().get_ms(tlli, tlli_old, imsi); |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 136 | if (ms) { |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 137 | ul_tbf = ms->ul_tbf(); |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 138 | ta = ms->ta(); |
| 139 | } |
Jacob Erlbeck | e2e004e | 2015-06-18 17:16:26 +0200 | [diff] [blame] | 140 | /* TODO: if (!ms) create MS before tbf_alloc is called? */ |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 141 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 142 | if (ul_tbf && ul_tbf->m_contention_resolution_done |
| 143 | && !ul_tbf->m_final_ack_sent) { |
| 144 | use_trx = ul_tbf->trx->trx_no; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 145 | ss = 0; |
| 146 | old_ul_tbf = ul_tbf; |
| 147 | } else { |
| 148 | use_trx = -1; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 149 | ss = 1; /* PCH assignment only allows one timeslot */ |
| 150 | old_ul_tbf = NULL; |
| 151 | } |
| 152 | |
| 153 | // Create new TBF (any TRX) |
| 154 | #warning "Copy and paste with alloc_ul_tbf" |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 155 | /* set number of downlink slots according to multislot class */ |
Jacob Erlbeck | 86b6f05 | 2015-11-27 15:17:34 +0100 | [diff] [blame] | 156 | dl_tbf = tbf_alloc_dl_tbf(bts, ms, use_trx, ms_class, egprs_ms_class, ss); |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 157 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 158 | if (!dl_tbf) { |
| 159 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 160 | return -EBUSY; |
| 161 | } |
Jacob Erlbeck | be0cbc1 | 2015-05-18 14:35:11 +0200 | [diff] [blame] | 162 | dl_tbf->update_ms(tlli, GPRS_RLCMAC_DL_TBF); |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 163 | dl_tbf->ms()->set_ta(ta); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 164 | |
| 165 | LOGP(DRLCMAC, LOGL_DEBUG, "%s [DOWNLINK] START\n", tbf_name(dl_tbf)); |
| 166 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 167 | /* Store IMSI for later look-up and PCH retransmission */ |
| 168 | dl_tbf->assign_imsi(imsi); |
| 169 | |
| 170 | /* trigger downlink assignment and set state to ASSIGN. |
| 171 | * we don't use old_downlink, so the possible uplink is used |
| 172 | * to trigger downlink assignment. if there is no uplink, |
| 173 | * AGCH is used. */ |
Jacob Erlbeck | 71e5511 | 2015-05-21 11:10:15 +0200 | [diff] [blame] | 174 | dl_tbf->bts->trigger_dl_ass(dl_tbf, old_ul_tbf); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 175 | *tbf = dl_tbf; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * TODO: split into unit test-able parts... |
| 181 | */ |
| 182 | int gprs_rlcmac_dl_tbf::handle(struct gprs_rlcmac_bts *bts, |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 183 | const uint32_t tlli, const uint32_t tlli_old, const char *imsi, |
Jacob Erlbeck | f4bb424 | 2016-01-20 13:30:34 +0100 | [diff] [blame] | 184 | uint8_t ms_class, uint8_t egprs_ms_class, |
Jacob Erlbeck | 14e00f8 | 2015-11-27 18:10:39 +0100 | [diff] [blame] | 185 | const uint16_t delay_csec, |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 186 | const uint8_t *data, const uint16_t len) |
| 187 | { |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 188 | struct gprs_rlcmac_dl_tbf *dl_tbf = NULL; |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 189 | int rc; |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 190 | GprsMs *ms, *ms_old; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 191 | |
| 192 | /* check for existing TBF */ |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 193 | ms = bts->bts->ms_store().get_ms(tlli, tlli_old, imsi); |
Jacob Erlbeck | f4bb424 | 2016-01-20 13:30:34 +0100 | [diff] [blame] | 194 | if (ms) { |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 195 | dl_tbf = ms->dl_tbf(); |
| 196 | |
Jacob Erlbeck | f4bb424 | 2016-01-20 13:30:34 +0100 | [diff] [blame] | 197 | /* If we known the GPRS/EGPRS MS class, use it */ |
| 198 | if (ms->ms_class() || ms->egprs_ms_class()) { |
| 199 | ms_class = ms->ms_class(); |
| 200 | egprs_ms_class = ms->egprs_ms_class(); |
| 201 | } |
| 202 | } |
Jacob Erlbeck | a47aaa4 | 2016-01-07 16:47:34 +0100 | [diff] [blame] | 203 | |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 204 | if (ms && strlen(ms->imsi()) == 0) { |
| 205 | ms_old = bts->bts->ms_store().get_ms(0, 0, imsi); |
| 206 | if (ms_old && ms_old != ms) { |
| 207 | /* The TLLI has changed (RAU), so there are two MS |
| 208 | * objects for the same MS */ |
| 209 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 210 | "There is a new MS object for the same MS: " |
| 211 | "(0x%08x, '%s') -> (0x%08x, '%s')\n", |
| 212 | ms_old->tlli(), ms_old->imsi(), |
| 213 | ms->tlli(), ms->imsi()); |
| 214 | |
| 215 | GprsMs::Guard guard_old(ms_old); |
| 216 | |
| 217 | if (!dl_tbf && ms_old->dl_tbf()) { |
| 218 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 219 | "%s IMSI %s: " |
| 220 | "moving DL TBF to new MS object\n", |
| 221 | dl_tbf->name(), imsi); |
| 222 | dl_tbf = ms_old->dl_tbf(); |
| 223 | /* Move the DL TBF to the new MS */ |
| 224 | dl_tbf->set_ms(ms); |
| 225 | } |
| 226 | /* Clean up the old MS object */ |
| 227 | /* TODO: Put this into a separate function, use timer? */ |
| 228 | if (ms_old->ul_tbf() && ms_old->ul_tbf()->T == 0) |
| 229 | tbf_free(ms_old->ul_tbf()); |
| 230 | if (ms_old->dl_tbf() && ms_old->dl_tbf()->T == 0) |
| 231 | tbf_free(ms_old->dl_tbf()); |
| 232 | |
Jacob Erlbeck | 2b349b5 | 2015-08-18 11:55:03 +0200 | [diff] [blame] | 233 | ms->merge_old_ms(ms_old); |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 234 | } |
| 235 | } |
| 236 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 237 | if (!dl_tbf) { |
Jacob Erlbeck | 86b6f05 | 2015-11-27 15:17:34 +0100 | [diff] [blame] | 238 | rc = tbf_new_dl_assignment(bts, imsi, tlli, tlli_old, |
Jacob Erlbeck | 14e00f8 | 2015-11-27 18:10:39 +0100 | [diff] [blame] | 239 | ms_class, egprs_ms_class, &dl_tbf); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 240 | if (rc < 0) |
| 241 | return rc; |
| 242 | } |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 243 | |
Jacob Erlbeck | 14e00f8 | 2015-11-27 18:10:39 +0100 | [diff] [blame] | 244 | /* TODO: ms_class vs. egprs_ms_class is not handled here */ |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 245 | rc = dl_tbf->append_data(ms_class, delay_csec, data, len); |
Jacob Erlbeck | af9a39d | 2015-08-16 21:27:34 +0200 | [diff] [blame] | 246 | dl_tbf->update_ms(tlli, GPRS_RLCMAC_DL_TBF); |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 247 | dl_tbf->assign_imsi(imsi); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 248 | |
| 249 | return rc; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | struct msgb *gprs_rlcmac_dl_tbf::llc_dequeue(bssgp_bvc_ctx *bctx) |
| 253 | { |
| 254 | struct msgb *msg; |
Jacob Erlbeck | 6e4ccec | 2015-05-06 14:24:36 +0200 | [diff] [blame] | 255 | struct timeval tv_now, tv_now2; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 256 | uint32_t octets = 0, frames = 0; |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 257 | struct timeval hyst_delta = {0, 0}; |
| 258 | const unsigned keep_small_thresh = 60; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 259 | const gprs_llc_queue::MetaInfo *info; |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 260 | |
| 261 | if (bts_data()->llc_discard_csec) |
| 262 | csecs_to_timeval(bts_data()->llc_discard_csec, &hyst_delta); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 263 | |
| 264 | gettimeofday(&tv_now, NULL); |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 265 | timeradd(&tv_now, &hyst_delta, &tv_now2); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 266 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 267 | while ((msg = llc_queue()->dequeue(&info))) { |
| 268 | const struct timeval *tv_disc = &info->expire_time; |
| 269 | const struct timeval *tv_recv = &info->recv_time; |
Jacob Erlbeck | 6e4ccec | 2015-05-06 14:24:36 +0200 | [diff] [blame] | 270 | |
| 271 | gprs_bssgp_update_queue_delay(tv_recv, &tv_now); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 272 | |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 273 | if (ms() && ms()->codel_state()) { |
| 274 | int bytes = llc_queue()->octets(); |
| 275 | if (gprs_codel_control(ms()->codel_state(), |
| 276 | tv_recv, &tv_now, bytes)) |
| 277 | goto drop_frame; |
| 278 | } |
| 279 | |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 280 | /* Is the age below the low water mark? */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 281 | if (!gprs_llc_queue::is_frame_expired(&tv_now2, tv_disc)) |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 282 | break; |
| 283 | |
| 284 | /* Is the age below the high water mark */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 285 | if (!gprs_llc_queue::is_frame_expired(&tv_now, tv_disc)) { |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 286 | /* Has the previous message not been dropped? */ |
| 287 | if (frames == 0) |
| 288 | break; |
| 289 | |
| 290 | /* Hysteresis mode, try to discard LLC messages until |
| 291 | * the low water mark has been reached */ |
| 292 | |
| 293 | /* Check whether to abort the hysteresis mode */ |
| 294 | |
| 295 | /* Is the frame small, perhaps only a TCP ACK? */ |
| 296 | if (msg->len <= keep_small_thresh) |
| 297 | break; |
| 298 | |
| 299 | /* Is it a GMM message? */ |
| 300 | if (!gprs_llc::is_user_data_frame(msg->data, msg->len)) |
| 301 | break; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 302 | } |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 303 | |
| 304 | bts->llc_timedout_frame(); |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 305 | drop_frame: |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 306 | frames++; |
| 307 | octets += msg->len; |
| 308 | msgb_free(msg); |
Jacob Erlbeck | 29d91e9 | 2015-04-29 14:46:52 +0200 | [diff] [blame] | 309 | bts->llc_dropped_frame(); |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 310 | continue; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 311 | } |
| 312 | |
| 313 | if (frames) { |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 314 | LOGP(DRLCMACDL, LOGL_NOTICE, "%s Discarding LLC PDU " |
| 315 | "because lifetime limit reached, " |
| 316 | "count=%u new_queue_size=%zu\n", |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 317 | tbf_name(this), frames, llc_queue()->size()); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 318 | if (frames > 0xff) |
| 319 | frames = 0xff; |
| 320 | if (octets > 0xffffff) |
| 321 | octets = 0xffffff; |
Jacob Erlbeck | 6e013a1 | 2015-08-21 15:10:23 +0200 | [diff] [blame] | 322 | if (bctx) |
| 323 | bssgp_tx_llc_discarded(bctx, tlli(), frames, octets); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 324 | } |
| 325 | |
| 326 | return msg; |
| 327 | } |
| 328 | |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 329 | bool gprs_rlcmac_dl_tbf::restart_bsn_cycle() |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 330 | { |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 331 | /* If V(S) == V(A) and finished state, we would have received |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 332 | * acknowledgement of all transmitted block. In this case we would |
| 333 | * have transmitted the final block, and received ack from MS. But in |
| 334 | * this case we did not receive the final ack indication from MS. This |
| 335 | * should never happen if MS works correctly. |
| 336 | */ |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 337 | if (m_window.window_empty()) { |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 338 | LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks\n"); |
| 339 | return false; |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 340 | } |
| 341 | |
| 342 | /* cycle through all unacked blocks */ |
| 343 | int resend = m_window.mark_for_resend(); |
| 344 | |
| 345 | /* At this point there should be at least one unacked block |
| 346 | * to be resent. If not, this is an software error. */ |
| 347 | if (resend == 0) { |
| 348 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 349 | "There are no unacknowledged blocks, but V(A) " |
| 350 | " != V(S). PLEASE FIX!\n"); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 351 | return false; |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 352 | } |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 353 | |
| 354 | return true; |
| 355 | } |
| 356 | |
| 357 | int gprs_rlcmac_dl_tbf::take_next_bsn(uint32_t fn, |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 358 | int previous_bsn, bool *may_combine) |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 359 | { |
| 360 | int bsn; |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 361 | int data_len2, force_data_len = -1; |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 362 | GprsCodingScheme cs2; |
| 363 | GprsCodingScheme force_cs; |
| 364 | |
| 365 | bsn = m_window.resend_needed(); |
| 366 | |
| 367 | if (previous_bsn >= 0) { |
| 368 | force_cs = m_rlc.block(previous_bsn)->cs; |
| 369 | if (!force_cs.isEgprs()) |
| 370 | return -1; |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 371 | force_data_len = m_rlc.block(previous_bsn)->len; |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 372 | } |
| 373 | |
| 374 | if (bsn >= 0) { |
| 375 | if (previous_bsn == bsn) |
| 376 | return -1; |
| 377 | |
| 378 | if (previous_bsn >= 0 && |
| 379 | m_window.mod_sns(bsn - previous_bsn) > RLC_EGPRS_MAX_BSN_DELTA) |
| 380 | return -1; |
| 381 | |
| 382 | cs2 = m_rlc.block(bsn)->cs; |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 383 | data_len2 = m_rlc.block(bsn)->len; |
| 384 | if (force_data_len > 0 && force_data_len != data_len2) |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 385 | return -1; |
| 386 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", bsn); |
| 387 | /* re-send block with negative aknowlegement */ |
| 388 | m_window.m_v_b.mark_unacked(bsn); |
| 389 | bts->rlc_resent(); |
| 390 | } else if (state_is(GPRS_RLCMAC_FINISHED)) { |
| 391 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 392 | "because all blocks have been transmitted.\n", |
| 393 | m_window.v_a()); |
| 394 | bts->rlc_restarted(); |
| 395 | if (restart_bsn_cycle()) |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 396 | return take_next_bsn(fn, previous_bsn, may_combine); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 397 | } else if (dl_window_stalled()) { |
| 398 | LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
| 399 | "because the window is stalled.\n", |
| 400 | m_window.v_a()); |
| 401 | bts->rlc_stalled(); |
| 402 | if (restart_bsn_cycle()) |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 403 | return take_next_bsn(fn, previous_bsn, may_combine); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 404 | } else if (have_data()) { |
| 405 | /* New blocks may be send */ |
| 406 | cs2 = force_cs ? force_cs : current_cs(); |
| 407 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 408 | "- Sending new block at BSN %d, CS=%s\n", |
| 409 | m_window.v_s(), cs2.name()); |
| 410 | |
| 411 | bsn = create_new_bsn(fn, cs2); |
| 412 | } else if (!m_window.window_empty()) { |
| 413 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 414 | "because all blocks have been transmitted (FLOW).\n", |
| 415 | m_window.v_a()); |
| 416 | bts->rlc_restarted(); |
| 417 | if (restart_bsn_cycle()) |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 418 | return take_next_bsn(fn, previous_bsn, may_combine); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 419 | } else { |
| 420 | /* Nothing left to send, create dummy LLC commands */ |
| 421 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 422 | "- Sending new dummy block at BSN %d, CS=%s\n", |
| 423 | m_window.v_s(), current_cs().name()); |
| 424 | bsn = create_new_bsn(fn, current_cs()); |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 425 | /* Don't send a second block, so don't set cs2 */ |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 426 | } |
| 427 | |
| 428 | if (bsn < 0) { |
| 429 | /* we just send final block again */ |
| 430 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 431 | "- Nothing else to send, Re-transmit final block!\n"); |
| 432 | bsn = m_window.v_s_mod(-1); |
| 433 | bts->rlc_resent(); |
| 434 | } |
| 435 | |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 436 | *may_combine = cs2.numDataBlocks() > 1; |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 437 | |
| 438 | return bsn; |
| 439 | } |
| 440 | |
| 441 | /* |
| 442 | * Create DL data block |
| 443 | * The messages are fragmented and forwarded as data blocks. |
| 444 | */ |
| 445 | struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block(uint32_t fn, uint8_t ts) |
| 446 | { |
| 447 | int bsn, bsn2 = -1; |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 448 | bool may_combine; |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 449 | |
| 450 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink (V(A)==%d .. " |
| 451 | "V(S)==%d)\n", tbf_name(this), |
| 452 | m_window.v_a(), m_window.v_s()); |
| 453 | |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 454 | bsn = take_next_bsn(fn, -1, &may_combine); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 455 | if (bsn < 0) |
| 456 | return NULL; |
| 457 | |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 458 | if (may_combine) |
| 459 | bsn2 = take_next_bsn(fn, bsn, &may_combine); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 460 | |
| 461 | return create_dl_acked_block(fn, ts, bsn, bsn2); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 462 | } |
| 463 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 464 | void gprs_rlcmac_dl_tbf::schedule_next_frame() |
| 465 | { |
| 466 | struct msgb *msg; |
| 467 | |
| 468 | if (m_llc.frame_length() != 0) |
| 469 | return; |
| 470 | |
| 471 | /* dequeue next LLC frame, if any */ |
| 472 | msg = llc_dequeue(gprs_bssgp_pcu_current_bctx()); |
| 473 | if (!msg) |
| 474 | return; |
| 475 | |
| 476 | LOGP(DRLCMACDL, LOGL_INFO, |
| 477 | "- Dequeue next LLC for %s (len=%d)\n", |
| 478 | tbf_name(this), msg->len); |
| 479 | |
| 480 | m_llc.put_frame(msg->data, msg->len); |
| 481 | bts->llc_frame_sched(); |
| 482 | msgb_free(msg); |
| 483 | m_last_dl_drained_fn = -1; |
| 484 | } |
| 485 | |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 486 | int gprs_rlcmac_dl_tbf::create_new_bsn(const uint32_t fn, GprsCodingScheme cs) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 487 | { |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 488 | uint8_t *data; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 489 | gprs_rlc_data *rlc_data; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 490 | const uint16_t bsn = m_window.v_s(); |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 491 | gprs_rlc_data_block_info *rdbi; |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 492 | int num_chunks = 0; |
| 493 | int write_offset = 0; |
| 494 | Encoding::AppendResult ar; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 495 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 496 | if (m_llc.frame_length() == 0) |
| 497 | schedule_next_frame(); |
| 498 | |
Jacob Erlbeck | cb72890 | 2016-01-05 15:33:03 +0100 | [diff] [blame] | 499 | OSMO_ASSERT(cs.isValid()); |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 500 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 501 | /* length of usable data block (single data unit w/o header) */ |
| 502 | const uint8_t block_data_len = cs.maxDataBlockBytes(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 503 | |
| 504 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 505 | rlc_data = m_rlc.block(bsn); |
| 506 | data = rlc_data->prepare(block_data_len); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 507 | rlc_data->cs = cs; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 508 | rlc_data->len = block_data_len; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 509 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 510 | rdbi = &(rlc_data->block_info); |
| 511 | memset(rdbi, 0, sizeof(*rdbi)); |
| 512 | rdbi->data_len = block_data_len; |
| 513 | |
| 514 | rdbi->cv = 15; /* Final Block Indicator, set late, if true */ |
| 515 | rdbi->bsn = bsn; /* Block Sequence Number */ |
| 516 | rdbi->e = 1; /* Extension bit, maybe set later (1: no extension) */ |
| 517 | |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 518 | do { |
| 519 | bool is_final; |
| 520 | |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 521 | if (m_llc.frame_length() == 0) { |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 522 | int space = block_data_len - write_offset; |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 523 | /* A header will need to by added, so we just need |
| 524 | * space-1 octets */ |
| 525 | m_llc.put_dummy_frame(space - 1); |
| 526 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 527 | /* The data just drained, store the current fn */ |
| 528 | if (m_last_dl_drained_fn < 0) |
| 529 | m_last_dl_drained_fn = fn; |
| 530 | |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 531 | /* It is not clear, when the next real data will |
| 532 | * arrive, so request a DL ack/nack now */ |
| 533 | request_dl_ack(); |
| 534 | |
| 535 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 536 | "-- Empty chunk, " |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 537 | "added LLC dummy command of size %d, " |
| 538 | "drained_since=%d\n", |
| 539 | m_llc.frame_length(), frames_since_last_drain(fn)); |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 540 | } |
| 541 | |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 542 | is_final = llc_queue()->size() == 0 && !keep_open(fn); |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 543 | |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 544 | ar = Encoding::rlc_data_to_dl_append(rdbi, cs, |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 545 | &m_llc, &write_offset, &num_chunks, data, is_final); |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 546 | |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 547 | if (ar == Encoding::AR_NEED_MORE_BLOCKS) |
| 548 | break; |
| 549 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 550 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for %s" |
| 551 | "len=%d\n", tbf_name(this), m_llc.frame_length()); |
| 552 | gprs_rlcmac_dl_bw(this, m_llc.frame_length()); |
| 553 | m_llc.reset(); |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 554 | |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 555 | if (is_final) { |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 556 | request_dl_ack(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 557 | set_state(GPRS_RLCMAC_FINISHED); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 558 | } |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 559 | |
| 560 | /* dequeue next LLC frame, if any */ |
| 561 | schedule_next_frame(); |
| 562 | } while (ar == Encoding::AR_COMPLETED_SPACE_LEFT); |
| 563 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 564 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block (BSN %d, %s): %s\n", |
| 565 | bsn, rlc_data->cs.name(), |
| 566 | osmo_hexdump(rlc_data->block, block_data_len)); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 567 | /* raise send state and set ack state array */ |
| 568 | m_window.m_v_b.mark_unacked(bsn); |
| 569 | m_window.increment_send(); |
| 570 | |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 571 | return bsn; |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 572 | } |
| 573 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 574 | struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block( |
| 575 | const uint32_t fn, const uint8_t ts, |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 576 | int index, int index2) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 577 | { |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 578 | uint8_t *msg_data; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 579 | struct msgb *dl_msg; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 580 | unsigned msg_len; |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 581 | bool need_poll; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 582 | /* TODO: support MCS-7 - MCS-9, where data_block_idx can be 1 */ |
| 583 | unsigned int data_block_idx = 0; |
Jacob Erlbeck | f2694b7 | 2016-01-26 21:46:26 +0100 | [diff] [blame] | 584 | unsigned int rrbp; |
| 585 | uint32_t new_poll_fn; |
| 586 | int rc; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 587 | bool is_final = false; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 588 | gprs_rlc_data_info rlc; |
| 589 | GprsCodingScheme cs; |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 590 | GprsCodingScheme cs_current_trans; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 591 | int bsns[ARRAY_SIZE(rlc.block_info)]; |
| 592 | unsigned num_bsns; |
Aravind Sirsikar | a859a21 | 2016-03-23 18:29:46 +0530 | [diff] [blame] | 593 | enum egprs_puncturing_values punct[ARRAY_SIZE(rlc.block_info)]; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 594 | bool need_padding = false; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 595 | |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 596 | /* |
| 597 | * TODO: This is an experimental work-around to put 2 BSN into |
| 598 | * MSC-7 to MCS-9 encoded messages. It just sends the same BSN |
| 599 | * twice in the block. The cs should be derived from the TBF's |
| 600 | * current CS such that both BSNs (that must be compatible) can |
| 601 | * be put into the data area, even if the resulting CS is higher than |
| 602 | * the current limit. |
| 603 | */ |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 604 | cs = m_rlc.block(index)->cs; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 605 | bsns[0] = index; |
| 606 | num_bsns = 1; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 607 | |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 608 | if (index2 >= 0) { |
| 609 | bsns[num_bsns] = index2; |
| 610 | num_bsns += 1; |
| 611 | } |
| 612 | |
Jacob Erlbeck | be881c0 | 2016-02-03 20:44:46 +0100 | [diff] [blame] | 613 | if (num_bsns == 1) { |
| 614 | /* TODO: remove the conditional when MCS-6 padding isn't |
| 615 | * failing to be decoded by MEs anymore */ |
| 616 | if (cs != GprsCodingScheme(GprsCodingScheme::MCS8)) |
| 617 | cs.decToSingleBlock(&need_padding); |
| 618 | } |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 619 | |
| 620 | gprs_rlc_data_info_init_dl(&rlc, cs, need_padding); |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 621 | |
| 622 | rlc.usf = 7; /* will be set at scheduler */ |
| 623 | rlc.pr = 0; /* FIXME: power reduction */ |
| 624 | rlc.tfi = m_tfi; /* TFI */ |
| 625 | |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 626 | /* return data block(s) as message */ |
| 627 | msg_len = cs.sizeDL(); |
| 628 | dl_msg = msgb_alloc(msg_len, "rlcmac_dl_data"); |
| 629 | if (!dl_msg) |
| 630 | return NULL; |
| 631 | |
| 632 | msg_data = msgb_put(dl_msg, msg_len); |
| 633 | |
| 634 | /* Copy block(s) to RLC message */ |
| 635 | for (data_block_idx = 0; data_block_idx < rlc.num_data_blocks; |
| 636 | data_block_idx++) |
| 637 | { |
| 638 | int bsn; |
| 639 | GprsCodingScheme cs_enc; |
| 640 | uint8_t *block_data; |
| 641 | gprs_rlc_data_block_info *rdbi, *block_info; |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 642 | enum egprs_puncturing_values punct_scheme; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 643 | |
| 644 | /* Check if there are more blocks than BSNs */ |
| 645 | if (data_block_idx < num_bsns) |
| 646 | bsn = bsns[data_block_idx]; |
| 647 | else |
| 648 | bsn = bsns[0]; |
| 649 | |
| 650 | cs_enc = m_rlc.block(bsn)->cs; |
| 651 | |
| 652 | /* get data and header from current block */ |
| 653 | block_data = m_rlc.block(bsn)->block; |
| 654 | |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 655 | /* TODO: Need to support MCS change during retx */ |
| 656 | cs_current_trans = cs; |
| 657 | |
| 658 | /* Get current puncturing scheme from block */ |
| 659 | punct_scheme = gprs_get_punct_scheme( |
| 660 | m_rlc.block(bsn)->next_ps, |
| 661 | cs, cs_current_trans); |
| 662 | |
| 663 | if (cs.isEgprs()) { |
| 664 | OSMO_ASSERT(punct_scheme >= EGPRS_PS_1); |
| 665 | OSMO_ASSERT(punct_scheme <= EGPRS_PS_3); |
| 666 | } |
| 667 | punct[data_block_idx] = punct_scheme; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 668 | |
| 669 | rdbi = &rlc.block_info[data_block_idx]; |
| 670 | block_info = &m_rlc.block(bsn)->block_info; |
| 671 | |
| 672 | if(rdbi->data_len != m_rlc.block(bsn)->len) { |
| 673 | LOGP(DRLCMACDL, LOGL_ERROR, |
| 674 | "ERROR: Expected len = %d for %s instead of " |
| 675 | "%d in data unit %d (BSN %d, %s)\n", |
| 676 | rdbi->data_len, cs.name(), m_rlc.block(bsn)->len, |
| 677 | data_block_idx, bsn, cs_enc.name()); |
| 678 | OSMO_ASSERT(rdbi->data_len == m_rlc.block(bsn)->len); |
| 679 | } |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 680 | |
| 681 | /* TODO: Need to handle 2 same bsns |
| 682 | * in header type 1 |
| 683 | */ |
| 684 | gprs_update_punct_scheme(&m_rlc.block(bsn)->next_ps, |
| 685 | cs_current_trans); |
| 686 | |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 687 | rdbi->e = block_info->e; |
| 688 | rdbi->cv = block_info->cv; |
| 689 | rdbi->bsn = bsn; |
| 690 | is_final = is_final || rdbi->cv == 0; |
| 691 | |
| 692 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Copying data unit %d (BSN %d)\n", |
| 693 | data_block_idx, bsn); |
| 694 | |
| 695 | Encoding::rlc_copy_from_aligned_buffer(&rlc, data_block_idx, |
| 696 | msg_data, block_data); |
| 697 | } |
| 698 | |
| 699 | OSMO_ASSERT(ARRAY_SIZE(punct) >= 2); |
| 700 | rlc.cps = gprs_rlc_mcs_cps(cs, punct[0], punct[1], need_padding); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 701 | |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 702 | /* If the TBF has just started, relate frames_since_last_poll to the |
| 703 | * current fn */ |
| 704 | if (m_last_dl_poll_fn < 0) |
| 705 | m_last_dl_poll_fn = fn; |
| 706 | |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 707 | need_poll = state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 708 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 709 | /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| 710 | */ |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 711 | if (m_tx_counter >= POLL_ACK_AFTER_FRAMES || m_dl_ack_requested || |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 712 | need_poll) { |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 713 | if (m_dl_ack_requested) { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 714 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 715 | "polling, because is was requested explicitly " |
| 716 | "(e.g. first final block sent).\n"); |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 717 | } else if (need_poll) { |
| 718 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Daniel Willmann | 635d47c | 2014-09-17 17:58:29 +0200 | [diff] [blame] | 719 | "polling, because polling timed out.\n"); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 720 | } else { |
| 721 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 722 | "polling, because %d blocks sent.\n", |
| 723 | POLL_ACK_AFTER_FRAMES); |
| 724 | } |
Jacob Erlbeck | f2694b7 | 2016-01-26 21:46:26 +0100 | [diff] [blame] | 725 | |
| 726 | rc = check_polling(fn, ts, &new_poll_fn, &rrbp); |
| 727 | if (rc >= 0) { |
| 728 | set_polling(new_poll_fn, ts); |
| 729 | |
| 730 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling scheduled in this " |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 731 | "TS %d\n", ts); |
| 732 | m_tx_counter = 0; |
| 733 | /* start timer whenever we send the final block */ |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 734 | if (is_final) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 735 | tbf_timer_start(this, 3191, bts_data()->t3191, 0); |
| 736 | |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 737 | /* Clear poll timeout flag */ |
| 738 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 739 | |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 740 | /* Clear request flag */ |
| 741 | m_dl_ack_requested = false; |
| 742 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 743 | /* set polling in header */ |
Jacob Erlbeck | f2694b7 | 2016-01-26 21:46:26 +0100 | [diff] [blame] | 744 | rlc.rrbp = rrbp; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 745 | rlc.es_p = 1; /* Polling */ |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 746 | |
| 747 | m_last_dl_poll_fn = poll_fn; |
Jacob Erlbeck | 16d29c7 | 2015-08-24 13:30:39 +0200 | [diff] [blame] | 748 | |
| 749 | LOGP(DRLCMACDL, LOGL_INFO, |
| 750 | "%s Scheduled Ack/Nack polling on FN=%d, TS=%d\n", |
Jacob Erlbeck | 8eb1714 | 2016-01-22 17:58:17 +0100 | [diff] [blame] | 751 | name(), poll_fn, poll_ts); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 752 | } |
| 753 | } |
| 754 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 755 | Encoding::rlc_write_dl_data_header(&rlc, msg_data); |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 756 | |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 757 | LOGP(DRLCMACDL, LOGL_DEBUG, "msg block (BSN %d, %s%s): %s\n", |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 758 | index, cs.name(), |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 759 | need_padding ? ", padded" : "", |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 760 | msgb_hexdump(dl_msg)); |
| 761 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 762 | /* Increment TX-counter */ |
| 763 | m_tx_counter++; |
| 764 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 765 | bts->rlc_sent(); |
| 766 | |
| 767 | return dl_msg; |
| 768 | } |
| 769 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 770 | static uint16_t bitnum_to_bsn(int bitnum, uint16_t ssn) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 771 | { |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 772 | return ssn - 1 - bitnum; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 773 | } |
| 774 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 775 | int gprs_rlcmac_dl_tbf::analyse_errors(char *show_rbb, uint8_t ssn, |
| 776 | ana_result *res) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 777 | { |
| 778 | gprs_rlc_data *rlc_data; |
| 779 | uint16_t lost = 0, received = 0, skipped = 0; |
Jacob Erlbeck | b41262f | 2016-02-05 17:13:24 +0100 | [diff] [blame] | 780 | char info[RLC_MAX_WS + 1]; |
| 781 | memset(info, '.', m_window.ws()); |
| 782 | info[m_window.ws()] = 0; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 783 | uint16_t bsn = 0; |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 784 | unsigned received_bytes = 0, lost_bytes = 0; |
| 785 | unsigned received_packets = 0, lost_packets = 0; |
Jacob Erlbeck | b41262f | 2016-02-05 17:13:24 +0100 | [diff] [blame] | 786 | unsigned num_blocks = strlen(show_rbb); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 787 | |
| 788 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
Jacob Erlbeck | b41262f | 2016-02-05 17:13:24 +0100 | [diff] [blame] | 789 | for (unsigned int bitpos = 0; bitpos < num_blocks; bitpos++) { |
| 790 | bool is_received; |
| 791 | int index = num_blocks - 1 - bitpos; |
| 792 | |
| 793 | is_received = (index >= 0 && show_rbb[index] == 'R'); |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 794 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 795 | bsn = m_window.mod_sns(bitnum_to_bsn(bitpos, ssn)); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 796 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 797 | if (bsn == m_window.mod_sns(m_window.v_a() - 1)) { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 798 | info[bitpos] = '$'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 799 | break; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 800 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 801 | |
| 802 | rlc_data = m_rlc.block(bsn); |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 803 | if (!rlc_data) { |
| 804 | info[bitpos] = '0'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 805 | continue; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 806 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 807 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 808 | /* Get general statistics */ |
| 809 | if (is_received && !m_window.m_v_b.is_acked(bsn)) { |
| 810 | received_packets += 1; |
| 811 | received_bytes += rlc_data->len; |
| 812 | } else if (!is_received && !m_window.m_v_b.is_nacked(bsn)) { |
| 813 | lost_packets += 1; |
| 814 | lost_bytes += rlc_data->len; |
| 815 | } |
| 816 | |
| 817 | /* Get statistics for current CS */ |
| 818 | |
Jacob Erlbeck | cb72890 | 2016-01-05 15:33:03 +0100 | [diff] [blame] | 819 | if (rlc_data->cs != current_cs()) { |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 820 | /* This block has already been encoded with a different |
| 821 | * CS, so it doesn't help us to decide, whether the |
| 822 | * current CS is ok. Ignore it. */ |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 823 | info[bitpos] = 'x'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 824 | skipped += 1; |
| 825 | continue; |
| 826 | } |
| 827 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 828 | if (is_received) { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 829 | if (!m_window.m_v_b.is_acked(bsn)) { |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 830 | received += 1; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 831 | info[bitpos] = 'R'; |
| 832 | } else { |
| 833 | info[bitpos] = 'r'; |
| 834 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 835 | } else { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 836 | info[bitpos] = 'L'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 837 | lost += 1; |
| 838 | } |
| 839 | } |
| 840 | |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 841 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s DL analysis, range=%d:%d, lost=%d, recv=%d, " |
| 842 | "skipped=%d, bsn=%d, info='%s'\n", |
| 843 | name(), m_window.v_a(), m_window.v_s(), lost, received, |
| 844 | skipped, bsn, info); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 845 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 846 | res->received_packets = received_packets; |
| 847 | res->lost_packets = lost_packets; |
| 848 | res->received_bytes = received_bytes; |
| 849 | res->lost_bytes = lost_bytes; |
| 850 | |
Jacob Erlbeck | 144a1d0 | 2015-06-04 16:51:44 +0200 | [diff] [blame] | 851 | if (lost + received <= 1) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 852 | return -1; |
| 853 | |
| 854 | return lost * 100 / (lost + received); |
| 855 | } |
| 856 | |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 857 | int gprs_rlcmac_dl_tbf::update_window(unsigned first_bsn, |
| 858 | const struct bitvec *rbb) |
| 859 | { |
| 860 | int16_t dist; /* must be signed */ |
| 861 | uint16_t lost = 0, received = 0; |
| 862 | char show_v_b[RLC_MAX_SNS + 1]; |
| 863 | char show_rbb[RLC_MAX_SNS + 1]; |
| 864 | int error_rate; |
| 865 | struct ana_result ana_res; |
| 866 | unsigned num_blocks = rbb->cur_bit; |
| 867 | unsigned behind_last_bsn = m_window.mod_sns(first_bsn + num_blocks); |
| 868 | |
| 869 | Decoding::extract_rbb(rbb, show_rbb); |
| 870 | /* show received array in debug */ |
| 871 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
| 872 | "(BSN=%d) R=ACK I=NACK\n", first_bsn, |
| 873 | show_rbb, m_window.mod_sns(behind_last_bsn - 1)); |
| 874 | |
| 875 | /* apply received array to receive state (first_bsn..behind_last_bsn-1) */ |
| 876 | if (num_blocks > 0) { |
| 877 | /* calculate distance of ssn from V(S) */ |
| 878 | dist = m_window.mod_sns(m_window.v_s() - behind_last_bsn); |
| 879 | /* check if distance is less than distance V(A)..V(S) */ |
| 880 | if (dist >= m_window.distance()) { |
| 881 | /* this might happpen, if the downlink assignment |
| 882 | * was not received by ms and the ack refers |
| 883 | * to previous TBF |
| 884 | * FIXME: we should implement polling for |
| 885 | * control ack! |
| 886 | * TODO: check whether this FIXME still makes sense |
| 887 | */ |
| 888 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 889 | "V(A)..V(S) range %s Free TBF!\n", tbf_name(this)); |
| 890 | return 1; /* indicate to free TBF */ |
| 891 | } |
| 892 | } |
| 893 | |
| 894 | error_rate = analyse_errors(show_rbb, behind_last_bsn, &ana_res); |
| 895 | |
| 896 | if (bts_data()->cs_adj_enabled && ms()) |
| 897 | ms()->update_error_rate(this, error_rate); |
| 898 | |
| 899 | m_window.update(bts, rbb, first_bsn, &lost, &received); |
| 900 | |
| 901 | /* report lost and received packets */ |
| 902 | gprs_rlcmac_received_lost(this, received, lost); |
| 903 | |
| 904 | /* Used to measure the leak rate */ |
| 905 | gprs_bssgp_update_bytes_received(ana_res.received_bytes, |
| 906 | ana_res.received_packets + ana_res.lost_packets); |
| 907 | |
| 908 | /* raise V(A), if possible */ |
| 909 | m_window.raise(m_window.move_window()); |
| 910 | |
| 911 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 912 | m_window.show_state(show_v_b); |
| 913 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 914 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 915 | "X=Resend-Unacked I=Invalid\n", |
| 916 | m_window.v_a(), show_v_b, |
| 917 | m_window.v_s_mod(-1)); |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 918 | return 0; |
| 919 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 920 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 921 | int gprs_rlcmac_dl_tbf::update_window(const uint8_t ssn, const uint8_t *rbb) |
| 922 | { |
| 923 | int16_t dist; /* must be signed */ |
| 924 | uint16_t lost = 0, received = 0; |
| 925 | char show_rbb[65]; |
| 926 | char show_v_b[RLC_MAX_SNS + 1]; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 927 | int error_rate; |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 928 | struct ana_result ana_res; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 929 | |
| 930 | Decoding::extract_rbb(rbb, show_rbb); |
| 931 | /* show received array in debug (bit 64..1) */ |
| 932 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 933 | "(BSN=%d) R=ACK I=NACK\n", m_window.mod_sns(ssn - 64), |
| 934 | show_rbb, m_window.mod_sns(ssn - 1)); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 935 | |
| 936 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 937 | /* calculate distance of ssn from V(S) */ |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 938 | dist = m_window.mod_sns(m_window.v_s() - ssn); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 939 | /* check if distance is less than distance V(A)..V(S) */ |
| 940 | if (dist >= m_window.distance()) { |
| 941 | /* this might happpen, if the downlink assignment |
| 942 | * was not received by ms and the ack refers |
| 943 | * to previous TBF |
| 944 | * FIXME: we should implement polling for |
| 945 | * control ack!*/ |
| 946 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 947 | "V(A)..V(S) range %s Free TBF!\n", tbf_name(this)); |
| 948 | return 1; /* indicate to free TBF */ |
| 949 | } |
| 950 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 951 | error_rate = analyse_errors(show_rbb, ssn, &ana_res); |
| 952 | |
| 953 | if (bts_data()->cs_adj_enabled && ms()) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 954 | ms()->update_error_rate(this, error_rate); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 955 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 956 | m_window.update(bts, show_rbb, ssn, |
| 957 | &lost, &received); |
| 958 | |
| 959 | /* report lost and received packets */ |
| 960 | gprs_rlcmac_received_lost(this, received, lost); |
| 961 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 962 | /* Used to measure the leak rate */ |
| 963 | gprs_bssgp_update_bytes_received(ana_res.received_bytes, |
| 964 | ana_res.received_packets + ana_res.lost_packets); |
| 965 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 966 | /* raise V(A), if possible */ |
| 967 | m_window.raise(m_window.move_window()); |
| 968 | |
| 969 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 970 | m_window.show_state(show_v_b); |
| 971 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 972 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 973 | "X=Resend-Unacked I=Invalid\n", |
| 974 | m_window.v_a(), show_v_b, |
| 975 | m_window.v_s_mod(-1)); |
| 976 | |
| 977 | if (state_is(GPRS_RLCMAC_FINISHED) && m_window.window_empty()) { |
| 978 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 979 | "all blocks, but without final ack " |
| 980 | "inidcation (don't worry)\n"); |
| 981 | } |
| 982 | return 0; |
| 983 | } |
| 984 | |
| 985 | |
| 986 | int gprs_rlcmac_dl_tbf::maybe_start_new_window() |
| 987 | { |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 988 | release(); |
| 989 | |
| 990 | /* check for LLC PDU in the LLC Queue */ |
| 991 | if (llc_queue()->size() > 0) |
| 992 | /* we have more data so we will re-use this tbf */ |
| 993 | establish_dl_tbf_on_pacch(); |
| 994 | |
| 995 | return 0; |
| 996 | } |
| 997 | |
| 998 | int gprs_rlcmac_dl_tbf::release() |
| 999 | { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1000 | uint16_t received; |
| 1001 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1002 | /* range V(A)..V(S)-1 */ |
| 1003 | received = m_window.count_unacked(); |
| 1004 | |
| 1005 | /* report all outstanding packets as received */ |
| 1006 | gprs_rlcmac_received_lost(this, received, 0); |
| 1007 | |
| 1008 | set_state(GPRS_RLCMAC_WAIT_RELEASE); |
| 1009 | |
Jacob Erlbeck | 04e72d3 | 2015-08-13 18:36:56 +0200 | [diff] [blame] | 1010 | /* start T3193 */ |
| 1011 | tbf_timer_start(this, 3193, |
| 1012 | bts_data()->t3193_msec / 1000, |
| 1013 | (bts_data()->t3193_msec % 1000) * 1000); |
| 1014 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1015 | /* reset rlc states */ |
| 1016 | m_tx_counter = 0; |
| 1017 | m_wait_confirm = 0; |
| 1018 | m_window.reset(); |
| 1019 | |
| 1020 | /* keep to flags */ |
| 1021 | state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; |
| 1022 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
| 1023 | |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 1024 | return 0; |
| 1025 | } |
| 1026 | |
Jacob Erlbeck | f04a5b3 | 2016-01-21 20:42:40 +0100 | [diff] [blame] | 1027 | int gprs_rlcmac_dl_tbf::abort() |
| 1028 | { |
| 1029 | uint16_t lost; |
| 1030 | |
| 1031 | if (state_is(GPRS_RLCMAC_FLOW)) { |
| 1032 | /* range V(A)..V(S)-1 */ |
| 1033 | lost = m_window.count_unacked(); |
| 1034 | |
| 1035 | /* report all outstanding packets as lost */ |
| 1036 | gprs_rlcmac_received_lost(this, 0, lost); |
| 1037 | gprs_rlcmac_lost_rep(this); |
| 1038 | |
| 1039 | /* TODO: Reschedule all LLC frames starting with the one that is |
| 1040 | * (partly) encoded in chunk 1 of block V(A). (optional) */ |
| 1041 | } |
| 1042 | |
| 1043 | set_state(GPRS_RLCMAC_RELEASING); |
| 1044 | |
| 1045 | /* reset rlc states */ |
| 1046 | m_window.reset(); |
| 1047 | |
| 1048 | /* keep to flags */ |
| 1049 | state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; |
| 1050 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
| 1051 | |
| 1052 | return 0; |
| 1053 | } |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 1054 | |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 1055 | int gprs_rlcmac_dl_tbf::rcvd_dl_ack(uint8_t final_ack, unsigned first_bsn, |
| 1056 | struct bitvec *rbb) |
| 1057 | { |
Jacob Erlbeck | b4beb54 | 2016-01-15 13:38:31 +0100 | [diff] [blame] | 1058 | int rc; |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 1059 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this)); |
| 1060 | |
Jacob Erlbeck | b4beb54 | 2016-01-15 13:38:31 +0100 | [diff] [blame] | 1061 | rc = update_window(first_bsn, rbb); |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 1062 | |
Jacob Erlbeck | b4beb54 | 2016-01-15 13:38:31 +0100 | [diff] [blame] | 1063 | if (final_ack) { |
| 1064 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 1065 | rc = maybe_start_new_window(); |
| 1066 | } else if (state_is(GPRS_RLCMAC_FINISHED) && m_window.window_empty()) { |
| 1067 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 1068 | "all blocks, but without final ack " |
| 1069 | "indication (don't worry)\n"); |
| 1070 | } |
| 1071 | |
| 1072 | return rc; |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 1073 | } |
| 1074 | |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 1075 | int gprs_rlcmac_dl_tbf::rcvd_dl_ack(uint8_t final_ack, uint8_t ssn, uint8_t *rbb) |
| 1076 | { |
| 1077 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this)); |
| 1078 | |
| 1079 | if (!final_ack) |
| 1080 | return update_window(ssn, rbb); |
| 1081 | |
| 1082 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 1083 | return maybe_start_new_window(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1084 | } |
| 1085 | |
| 1086 | bool gprs_rlcmac_dl_tbf::dl_window_stalled() const |
| 1087 | { |
| 1088 | return m_window.window_stalled(); |
| 1089 | } |
| 1090 | |
Jacob Erlbeck | eceb910 | 2015-03-20 14:41:50 +0100 | [diff] [blame] | 1091 | void gprs_rlcmac_dl_tbf::request_dl_ack() |
| 1092 | { |
| 1093 | m_dl_ack_requested = true; |
| 1094 | } |
| 1095 | |
| 1096 | bool gprs_rlcmac_dl_tbf::need_control_ts() const |
| 1097 | { |
| 1098 | if (poll_state != GPRS_RLCMAC_POLL_NONE) |
| 1099 | return false; |
| 1100 | |
| 1101 | return state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK) || |
| 1102 | m_tx_counter >= POLL_ACK_AFTER_FRAMES || |
| 1103 | m_dl_ack_requested; |
| 1104 | } |
| 1105 | |
| 1106 | bool gprs_rlcmac_dl_tbf::have_data() const |
| 1107 | { |
Jacob Erlbeck | 489a2b3 | 2015-05-28 19:07:01 +0200 | [diff] [blame] | 1108 | return m_llc.chunk_size() > 0 || |
| 1109 | (llc_queue() && llc_queue()->size() > 0); |
Jacob Erlbeck | eceb910 | 2015-03-20 14:41:50 +0100 | [diff] [blame] | 1110 | } |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 1111 | |
| 1112 | int gprs_rlcmac_dl_tbf::frames_since_last_poll(unsigned fn) const |
| 1113 | { |
| 1114 | unsigned wrapped; |
| 1115 | if (m_last_dl_poll_fn < 0) |
| 1116 | return -1; |
| 1117 | |
| 1118 | wrapped = (fn + 2715648 - m_last_dl_poll_fn) % 2715648; |
| 1119 | if (wrapped < 2715648/2) |
| 1120 | return wrapped; |
| 1121 | else |
| 1122 | return wrapped - 2715648; |
| 1123 | } |
| 1124 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 1125 | int gprs_rlcmac_dl_tbf::frames_since_last_drain(unsigned fn) const |
| 1126 | { |
| 1127 | unsigned wrapped; |
| 1128 | if (m_last_dl_drained_fn < 0) |
| 1129 | return -1; |
| 1130 | |
| 1131 | wrapped = (fn + 2715648 - m_last_dl_drained_fn) % 2715648; |
| 1132 | if (wrapped < 2715648/2) |
| 1133 | return wrapped; |
| 1134 | else |
| 1135 | return wrapped - 2715648; |
| 1136 | } |
| 1137 | |
| 1138 | bool gprs_rlcmac_dl_tbf::keep_open(unsigned fn) const |
| 1139 | { |
| 1140 | int keep_time_frames; |
| 1141 | |
| 1142 | if (bts_data()->dl_tbf_idle_msec <= 0) |
| 1143 | return false; |
| 1144 | |
| 1145 | keep_time_frames = msecs_to_frames(bts_data()->dl_tbf_idle_msec); |
| 1146 | return frames_since_last_drain(fn) <= keep_time_frames; |
| 1147 | } |