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 | a47aaa4 | 2016-01-07 16:47:34 +0100 | [diff] [blame] | 184 | const 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); |
| 194 | if (ms) |
| 195 | dl_tbf = ms->dl_tbf(); |
| 196 | |
Jacob Erlbeck | a47aaa4 | 2016-01-07 16:47:34 +0100 | [diff] [blame] | 197 | /* Work-around to get EGPRS MS class */ |
| 198 | if (ms && !egprs_ms_class) |
| 199 | egprs_ms_class = ms->egprs_ms_class(); |
| 200 | |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 201 | if (ms && strlen(ms->imsi()) == 0) { |
| 202 | ms_old = bts->bts->ms_store().get_ms(0, 0, imsi); |
| 203 | if (ms_old && ms_old != ms) { |
| 204 | /* The TLLI has changed (RAU), so there are two MS |
| 205 | * objects for the same MS */ |
| 206 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 207 | "There is a new MS object for the same MS: " |
| 208 | "(0x%08x, '%s') -> (0x%08x, '%s')\n", |
| 209 | ms_old->tlli(), ms_old->imsi(), |
| 210 | ms->tlli(), ms->imsi()); |
| 211 | |
| 212 | GprsMs::Guard guard_old(ms_old); |
| 213 | |
| 214 | if (!dl_tbf && ms_old->dl_tbf()) { |
| 215 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 216 | "%s IMSI %s: " |
| 217 | "moving DL TBF to new MS object\n", |
| 218 | dl_tbf->name(), imsi); |
| 219 | dl_tbf = ms_old->dl_tbf(); |
| 220 | /* Move the DL TBF to the new MS */ |
| 221 | dl_tbf->set_ms(ms); |
| 222 | } |
| 223 | /* Clean up the old MS object */ |
| 224 | /* TODO: Put this into a separate function, use timer? */ |
| 225 | if (ms_old->ul_tbf() && ms_old->ul_tbf()->T == 0) |
| 226 | tbf_free(ms_old->ul_tbf()); |
| 227 | if (ms_old->dl_tbf() && ms_old->dl_tbf()->T == 0) |
| 228 | tbf_free(ms_old->dl_tbf()); |
| 229 | |
Jacob Erlbeck | 2b349b5 | 2015-08-18 11:55:03 +0200 | [diff] [blame] | 230 | ms->merge_old_ms(ms_old); |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 231 | } |
| 232 | } |
| 233 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 234 | if (!dl_tbf) { |
Jacob Erlbeck | 86b6f05 | 2015-11-27 15:17:34 +0100 | [diff] [blame] | 235 | rc = tbf_new_dl_assignment(bts, imsi, tlli, tlli_old, |
Jacob Erlbeck | 14e00f8 | 2015-11-27 18:10:39 +0100 | [diff] [blame] | 236 | ms_class, egprs_ms_class, &dl_tbf); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 237 | if (rc < 0) |
| 238 | return rc; |
| 239 | } |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 240 | |
Jacob Erlbeck | 14e00f8 | 2015-11-27 18:10:39 +0100 | [diff] [blame] | 241 | /* TODO: ms_class vs. egprs_ms_class is not handled here */ |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 242 | rc = dl_tbf->append_data(ms_class, delay_csec, data, len); |
Jacob Erlbeck | af9a39d | 2015-08-16 21:27:34 +0200 | [diff] [blame] | 243 | dl_tbf->update_ms(tlli, GPRS_RLCMAC_DL_TBF); |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 244 | dl_tbf->assign_imsi(imsi); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 245 | |
| 246 | return rc; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 247 | } |
| 248 | |
| 249 | struct msgb *gprs_rlcmac_dl_tbf::llc_dequeue(bssgp_bvc_ctx *bctx) |
| 250 | { |
| 251 | struct msgb *msg; |
Jacob Erlbeck | 6e4ccec | 2015-05-06 14:24:36 +0200 | [diff] [blame] | 252 | struct timeval tv_now, tv_now2; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 253 | uint32_t octets = 0, frames = 0; |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 254 | struct timeval hyst_delta = {0, 0}; |
| 255 | const unsigned keep_small_thresh = 60; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 256 | const gprs_llc_queue::MetaInfo *info; |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 257 | |
| 258 | if (bts_data()->llc_discard_csec) |
| 259 | csecs_to_timeval(bts_data()->llc_discard_csec, &hyst_delta); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 260 | |
| 261 | gettimeofday(&tv_now, NULL); |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 262 | timeradd(&tv_now, &hyst_delta, &tv_now2); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 263 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 264 | while ((msg = llc_queue()->dequeue(&info))) { |
| 265 | const struct timeval *tv_disc = &info->expire_time; |
| 266 | const struct timeval *tv_recv = &info->recv_time; |
Jacob Erlbeck | 6e4ccec | 2015-05-06 14:24:36 +0200 | [diff] [blame] | 267 | |
| 268 | gprs_bssgp_update_queue_delay(tv_recv, &tv_now); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 269 | |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 270 | if (ms() && ms()->codel_state()) { |
| 271 | int bytes = llc_queue()->octets(); |
| 272 | if (gprs_codel_control(ms()->codel_state(), |
| 273 | tv_recv, &tv_now, bytes)) |
| 274 | goto drop_frame; |
| 275 | } |
| 276 | |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 277 | /* Is the age below the low water mark? */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 278 | if (!gprs_llc_queue::is_frame_expired(&tv_now2, tv_disc)) |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 279 | break; |
| 280 | |
| 281 | /* Is the age below the high water mark */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 282 | if (!gprs_llc_queue::is_frame_expired(&tv_now, tv_disc)) { |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 283 | /* Has the previous message not been dropped? */ |
| 284 | if (frames == 0) |
| 285 | break; |
| 286 | |
| 287 | /* Hysteresis mode, try to discard LLC messages until |
| 288 | * the low water mark has been reached */ |
| 289 | |
| 290 | /* Check whether to abort the hysteresis mode */ |
| 291 | |
| 292 | /* Is the frame small, perhaps only a TCP ACK? */ |
| 293 | if (msg->len <= keep_small_thresh) |
| 294 | break; |
| 295 | |
| 296 | /* Is it a GMM message? */ |
| 297 | if (!gprs_llc::is_user_data_frame(msg->data, msg->len)) |
| 298 | break; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 299 | } |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 300 | |
| 301 | bts->llc_timedout_frame(); |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 302 | drop_frame: |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 303 | frames++; |
| 304 | octets += msg->len; |
| 305 | msgb_free(msg); |
Jacob Erlbeck | 29d91e9 | 2015-04-29 14:46:52 +0200 | [diff] [blame] | 306 | bts->llc_dropped_frame(); |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 307 | continue; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 308 | } |
| 309 | |
| 310 | if (frames) { |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 311 | LOGP(DRLCMACDL, LOGL_NOTICE, "%s Discarding LLC PDU " |
| 312 | "because lifetime limit reached, " |
| 313 | "count=%u new_queue_size=%zu\n", |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 314 | tbf_name(this), frames, llc_queue()->size()); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 315 | if (frames > 0xff) |
| 316 | frames = 0xff; |
| 317 | if (octets > 0xffffff) |
| 318 | octets = 0xffffff; |
Jacob Erlbeck | 6e013a1 | 2015-08-21 15:10:23 +0200 | [diff] [blame] | 319 | if (bctx) |
| 320 | bssgp_tx_llc_discarded(bctx, tlli(), frames, octets); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 321 | } |
| 322 | |
| 323 | return msg; |
| 324 | } |
| 325 | |
| 326 | /* |
| 327 | * Create DL data block |
| 328 | * The messages are fragmented and forwarded as data blocks. |
| 329 | */ |
| 330 | struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block(uint32_t fn, uint8_t ts) |
| 331 | { |
| 332 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink (V(A)==%d .. " |
| 333 | "V(S)==%d)\n", tbf_name(this), |
| 334 | m_window.v_a(), m_window.v_s()); |
| 335 | |
| 336 | do_resend: |
| 337 | /* check if there is a block with negative acknowledgement */ |
| 338 | int resend_bsn = m_window.resend_needed(); |
| 339 | if (resend_bsn >= 0) { |
| 340 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", resend_bsn); |
| 341 | /* re-send block with negative aknowlegement */ |
| 342 | m_window.m_v_b.mark_unacked(resend_bsn); |
| 343 | bts->rlc_resent(); |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 344 | return create_dl_acked_block(fn, ts, resend_bsn); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | /* if the window has stalled, or transfer is complete, |
| 348 | * send an unacknowledged block */ |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 349 | if (state_is(GPRS_RLCMAC_FINISHED)) { |
| 350 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 351 | "because all blocks have been transmitted.\n", |
| 352 | m_window.v_a()); |
| 353 | bts->rlc_restarted(); |
| 354 | } else if (dl_window_stalled()) { |
| 355 | LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
| 356 | "because all window is stalled.\n", |
| 357 | m_window.v_a()); |
| 358 | bts->rlc_stalled(); |
Jacob Erlbeck | e25b5b9 | 2015-03-19 14:21:33 +0100 | [diff] [blame] | 359 | } else if (have_data()) { |
| 360 | /* New blocks may be send */ |
| 361 | return create_new_bsn(fn, ts); |
| 362 | } else if (!m_window.window_empty()) { |
| 363 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 364 | "because all blocks have been transmitted (FLOW).\n", |
| 365 | m_window.v_a()); |
| 366 | bts->rlc_restarted(); |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 367 | } else { |
Jacob Erlbeck | e25b5b9 | 2015-03-19 14:21:33 +0100 | [diff] [blame] | 368 | /* Nothing left to send, create dummy LLC commands */ |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 369 | return create_new_bsn(fn, ts); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 370 | } |
| 371 | |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 372 | /* If V(S) == V(A) and finished state, we would have received |
| 373 | * acknowledgement of all transmitted block. In this case we |
| 374 | * would have transmitted the final block, and received ack |
| 375 | * from MS. But in this case we did not receive the final ack |
| 376 | * indication from MS. This should never happen if MS works |
| 377 | * correctly. */ |
| 378 | if (m_window.window_empty()) { |
| 379 | LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks, " |
| 380 | "so we re-transmit final block!\n"); |
| 381 | /* we just send final block again */ |
| 382 | int16_t index = m_window.v_s_mod(-1); |
| 383 | bts->rlc_resent(); |
| 384 | return create_dl_acked_block(fn, ts, index); |
| 385 | } |
| 386 | |
| 387 | /* cycle through all unacked blocks */ |
| 388 | int resend = m_window.mark_for_resend(); |
| 389 | |
| 390 | /* At this point there should be at least one unacked block |
| 391 | * to be resent. If not, this is an software error. */ |
| 392 | if (resend == 0) { |
| 393 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 394 | "There are no unacknowledged blocks, but V(A) " |
| 395 | " != V(S). PLEASE FIX!\n"); |
| 396 | /* we just send final block again */ |
| 397 | int16_t index = m_window.v_s_mod(-1); |
| 398 | return create_dl_acked_block(fn, ts, index); |
| 399 | } |
| 400 | goto do_resend; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 401 | } |
| 402 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 403 | void gprs_rlcmac_dl_tbf::schedule_next_frame() |
| 404 | { |
| 405 | struct msgb *msg; |
| 406 | |
| 407 | if (m_llc.frame_length() != 0) |
| 408 | return; |
| 409 | |
| 410 | /* dequeue next LLC frame, if any */ |
| 411 | msg = llc_dequeue(gprs_bssgp_pcu_current_bctx()); |
| 412 | if (!msg) |
| 413 | return; |
| 414 | |
| 415 | LOGP(DRLCMACDL, LOGL_INFO, |
| 416 | "- Dequeue next LLC for %s (len=%d)\n", |
| 417 | tbf_name(this), msg->len); |
| 418 | |
| 419 | m_llc.put_frame(msg->data, msg->len); |
| 420 | bts->llc_frame_sched(); |
| 421 | msgb_free(msg); |
| 422 | m_last_dl_drained_fn = -1; |
| 423 | } |
| 424 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 425 | struct msgb *gprs_rlcmac_dl_tbf::create_new_bsn(const uint32_t fn, const uint8_t ts) |
| 426 | { |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 427 | uint8_t *data; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 428 | gprs_rlc_data *rlc_data; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 429 | const uint16_t bsn = m_window.v_s(); |
Jacob Erlbeck | cb72890 | 2016-01-05 15:33:03 +0100 | [diff] [blame] | 430 | GprsCodingScheme cs = current_cs(); |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 431 | gprs_rlc_data_block_info *rdbi; |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 432 | int num_chunks = 0; |
| 433 | int write_offset = 0; |
| 434 | Encoding::AppendResult ar; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 435 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 436 | if (m_llc.frame_length() == 0) |
| 437 | schedule_next_frame(); |
| 438 | |
Jacob Erlbeck | cb72890 | 2016-01-05 15:33:03 +0100 | [diff] [blame] | 439 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d, CS=%s\n", |
| 440 | m_window.v_s(), cs.name()); |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 441 | |
Jacob Erlbeck | cb72890 | 2016-01-05 15:33:03 +0100 | [diff] [blame] | 442 | OSMO_ASSERT(cs.isValid()); |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 443 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 444 | /* length of usable data block (single data unit w/o header) */ |
| 445 | const uint8_t block_data_len = cs.maxDataBlockBytes(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 446 | |
| 447 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 448 | rlc_data = m_rlc.block(bsn); |
| 449 | data = rlc_data->prepare(block_data_len); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 450 | rlc_data->cs = cs; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 451 | rlc_data->len = block_data_len; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 452 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 453 | rdbi = &(rlc_data->block_info); |
| 454 | memset(rdbi, 0, sizeof(*rdbi)); |
| 455 | rdbi->data_len = block_data_len; |
| 456 | |
| 457 | rdbi->cv = 15; /* Final Block Indicator, set late, if true */ |
| 458 | rdbi->bsn = bsn; /* Block Sequence Number */ |
| 459 | rdbi->e = 1; /* Extension bit, maybe set later (1: no extension) */ |
| 460 | |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 461 | do { |
| 462 | bool is_final; |
| 463 | |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 464 | if (m_llc.frame_length() == 0) { |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 465 | int space = block_data_len - write_offset; |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 466 | /* A header will need to by added, so we just need |
| 467 | * space-1 octets */ |
| 468 | m_llc.put_dummy_frame(space - 1); |
| 469 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 470 | /* The data just drained, store the current fn */ |
| 471 | if (m_last_dl_drained_fn < 0) |
| 472 | m_last_dl_drained_fn = fn; |
| 473 | |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 474 | /* It is not clear, when the next real data will |
| 475 | * arrive, so request a DL ack/nack now */ |
| 476 | request_dl_ack(); |
| 477 | |
| 478 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 479 | "-- Empty chunk, " |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 480 | "added LLC dummy command of size %d, " |
| 481 | "drained_since=%d\n", |
| 482 | m_llc.frame_length(), frames_since_last_drain(fn)); |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 483 | } |
| 484 | |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 485 | is_final = llc_queue()->size() == 0 && !keep_open(fn); |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 486 | |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 487 | ar = Encoding::rlc_data_to_dl_append(rdbi, cs, |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 488 | &m_llc, &write_offset, &num_chunks, data, is_final); |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 489 | |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 490 | if (ar == Encoding::AR_NEED_MORE_BLOCKS) |
| 491 | break; |
| 492 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 493 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for %s" |
| 494 | "len=%d\n", tbf_name(this), m_llc.frame_length()); |
| 495 | gprs_rlcmac_dl_bw(this, m_llc.frame_length()); |
| 496 | m_llc.reset(); |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 497 | |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 498 | if (is_final) { |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 499 | request_dl_ack(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 500 | set_state(GPRS_RLCMAC_FINISHED); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 501 | } |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 502 | |
| 503 | /* dequeue next LLC frame, if any */ |
| 504 | schedule_next_frame(); |
| 505 | } while (ar == Encoding::AR_COMPLETED_SPACE_LEFT); |
| 506 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 507 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block (BSN %d, %s): %s\n", |
| 508 | bsn, rlc_data->cs.name(), |
| 509 | osmo_hexdump(rlc_data->block, block_data_len)); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 510 | /* raise send state and set ack state array */ |
| 511 | m_window.m_v_b.mark_unacked(bsn); |
| 512 | m_window.increment_send(); |
| 513 | |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 514 | return create_dl_acked_block(fn, ts, bsn); |
| 515 | } |
| 516 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 517 | struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block( |
| 518 | const uint32_t fn, const uint8_t ts, |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 519 | const int index) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 520 | { |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 521 | uint8_t *block_data, *msg_data; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 522 | struct msgb *dl_msg; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 523 | unsigned msg_len; |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 524 | bool need_poll; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 525 | /* TODO: support MCS-7 - MCS-9, where data_block_idx can be 1 */ |
| 526 | unsigned int data_block_idx = 0; |
| 527 | |
| 528 | gprs_rlc_data_info rlc; |
| 529 | GprsCodingScheme cs; |
| 530 | gprs_rlc_data_block_info *rdbi; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 531 | |
| 532 | /* get data and header from current block */ |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 533 | block_data = m_rlc.block(index)->block; |
| 534 | |
| 535 | cs = m_rlc.block(index)->cs; |
| 536 | |
| 537 | gprs_rlc_data_info_init_dl(&rlc, cs); |
| 538 | |
| 539 | rlc.usf = 7; /* will be set at scheduler */ |
| 540 | rlc.pr = 0; /* FIXME: power reduction */ |
| 541 | rlc.tfi = m_tfi; /* TFI */ |
Jacob Erlbeck | 70955c7 | 2016-01-13 13:09:09 +0100 | [diff] [blame] | 542 | rlc.cps = gprs_rlc_mcs_cps(cs, 0, 0); |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 543 | |
| 544 | rlc.block_info[data_block_idx] = m_rlc.block(index)->block_info; |
| 545 | rdbi = &rlc.block_info[data_block_idx]; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 546 | |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 547 | /* If the TBF has just started, relate frames_since_last_poll to the |
| 548 | * current fn */ |
| 549 | if (m_last_dl_poll_fn < 0) |
| 550 | m_last_dl_poll_fn = fn; |
| 551 | |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 552 | need_poll = state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 553 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 554 | /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| 555 | */ |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 556 | if (m_tx_counter >= POLL_ACK_AFTER_FRAMES || m_dl_ack_requested || |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 557 | need_poll) { |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 558 | if (m_dl_ack_requested) { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 559 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 560 | "polling, because is was requested explicitly " |
| 561 | "(e.g. first final block sent).\n"); |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 562 | } else if (need_poll) { |
| 563 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Daniel Willmann | 635d47c | 2014-09-17 17:58:29 +0200 | [diff] [blame] | 564 | "polling, because polling timed out.\n"); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 565 | } else { |
| 566 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 567 | "polling, because %d blocks sent.\n", |
| 568 | POLL_ACK_AFTER_FRAMES); |
| 569 | } |
| 570 | /* scheduling not possible, because: */ |
| 571 | if (poll_state != GPRS_RLCMAC_POLL_NONE) |
| 572 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling is already " |
| 573 | "sheduled for %s, so we must wait for " |
| 574 | "requesting downlink ack\n", tbf_name(this)); |
| 575 | else if (control_ts != ts) |
| 576 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling cannot be " |
| 577 | "sheduled in this TS %d, waiting for " |
| 578 | "TS %d\n", ts, control_ts); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 579 | else if (bts->sba()->find(trx->trx_no, ts, (fn + 13) % 2715648)) |
| 580 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling cannot be " |
| 581 | "sheduled, because single block alllocation " |
| 582 | "already exists\n"); |
| 583 | else { |
| 584 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling sheduled in this " |
| 585 | "TS %d\n", ts); |
| 586 | m_tx_counter = 0; |
| 587 | /* start timer whenever we send the final block */ |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 588 | if (rdbi->cv == 0) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 589 | tbf_timer_start(this, 3191, bts_data()->t3191, 0); |
| 590 | |
| 591 | /* schedule polling */ |
| 592 | poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 593 | poll_fn = (fn + 13) % 2715648; |
| 594 | |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 595 | /* Clear poll timeout flag */ |
| 596 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 597 | |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 598 | /* Clear request flag */ |
| 599 | m_dl_ack_requested = false; |
| 600 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 601 | /* set polling in header */ |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 602 | rlc.rrbp = 0; /* N+13 */ |
| 603 | rlc.es_p = 1; /* Polling */ |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 604 | |
| 605 | m_last_dl_poll_fn = poll_fn; |
Jacob Erlbeck | 16d29c7 | 2015-08-24 13:30:39 +0200 | [diff] [blame] | 606 | |
| 607 | LOGP(DRLCMACDL, LOGL_INFO, |
| 608 | "%s Scheduled Ack/Nack polling on FN=%d, TS=%d\n", |
| 609 | name(), poll_fn, ts); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 610 | } |
| 611 | } |
| 612 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 613 | msg_len = cs.sizeDL(); |
| 614 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 615 | /* return data block as message */ |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 616 | dl_msg = msgb_alloc(msg_len, "rlcmac_dl_data"); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 617 | if (!dl_msg) |
| 618 | return NULL; |
| 619 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 620 | msg_data = msgb_put(dl_msg, msg_len); |
| 621 | Encoding::rlc_write_dl_data_header(&rlc, msg_data); |
| 622 | Encoding::rlc_copy_from_aligned_buffer(&rlc, data_block_idx, msg_data, |
| 623 | block_data); |
| 624 | |
| 625 | LOGP(DRLCMACDL, LOGL_DEBUG, "msg block (BSN %d, %s): %s\n", |
| 626 | index, cs.name(), |
| 627 | msgb_hexdump(dl_msg)); |
| 628 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 629 | /* Increment TX-counter */ |
| 630 | m_tx_counter++; |
| 631 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 632 | bts->rlc_sent(); |
| 633 | |
| 634 | return dl_msg; |
| 635 | } |
| 636 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 637 | static uint16_t bitnum_to_bsn(int bitnum, uint16_t ssn) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 638 | { |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 639 | return ssn - 1 - bitnum; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 640 | } |
| 641 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 642 | int gprs_rlcmac_dl_tbf::analyse_errors(char *show_rbb, uint8_t ssn, |
| 643 | ana_result *res) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 644 | { |
| 645 | gprs_rlc_data *rlc_data; |
| 646 | uint16_t lost = 0, received = 0, skipped = 0; |
Jacob Erlbeck | b41262f | 2016-02-05 17:13:24 +0100 | [diff] [blame] | 647 | char info[RLC_MAX_WS + 1]; |
| 648 | memset(info, '.', m_window.ws()); |
| 649 | info[m_window.ws()] = 0; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 650 | uint16_t bsn = 0; |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 651 | unsigned received_bytes = 0, lost_bytes = 0; |
| 652 | unsigned received_packets = 0, lost_packets = 0; |
Jacob Erlbeck | b41262f | 2016-02-05 17:13:24 +0100 | [diff] [blame] | 653 | unsigned num_blocks = strlen(show_rbb); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 654 | |
| 655 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
Jacob Erlbeck | b41262f | 2016-02-05 17:13:24 +0100 | [diff] [blame] | 656 | for (unsigned int bitpos = 0; bitpos < num_blocks; bitpos++) { |
| 657 | bool is_received; |
| 658 | int index = num_blocks - 1 - bitpos; |
| 659 | |
| 660 | is_received = (index >= 0 && show_rbb[index] == 'R'); |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 661 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 662 | bsn = m_window.mod_sns(bitnum_to_bsn(bitpos, ssn)); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 663 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 664 | if (bsn == m_window.mod_sns(m_window.v_a() - 1)) { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 665 | info[bitpos] = '$'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 666 | break; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 667 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 668 | |
| 669 | rlc_data = m_rlc.block(bsn); |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 670 | if (!rlc_data) { |
| 671 | info[bitpos] = '0'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 672 | continue; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 673 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 674 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 675 | /* Get general statistics */ |
| 676 | if (is_received && !m_window.m_v_b.is_acked(bsn)) { |
| 677 | received_packets += 1; |
| 678 | received_bytes += rlc_data->len; |
| 679 | } else if (!is_received && !m_window.m_v_b.is_nacked(bsn)) { |
| 680 | lost_packets += 1; |
| 681 | lost_bytes += rlc_data->len; |
| 682 | } |
| 683 | |
| 684 | /* Get statistics for current CS */ |
| 685 | |
Jacob Erlbeck | cb72890 | 2016-01-05 15:33:03 +0100 | [diff] [blame] | 686 | if (rlc_data->cs != current_cs()) { |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 687 | /* This block has already been encoded with a different |
| 688 | * CS, so it doesn't help us to decide, whether the |
| 689 | * current CS is ok. Ignore it. */ |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 690 | info[bitpos] = 'x'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 691 | skipped += 1; |
| 692 | continue; |
| 693 | } |
| 694 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 695 | if (is_received) { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 696 | if (!m_window.m_v_b.is_acked(bsn)) { |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 697 | received += 1; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 698 | info[bitpos] = 'R'; |
| 699 | } else { |
| 700 | info[bitpos] = 'r'; |
| 701 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 702 | } else { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 703 | info[bitpos] = 'L'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 704 | lost += 1; |
| 705 | } |
| 706 | } |
| 707 | |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 708 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s DL analysis, range=%d:%d, lost=%d, recv=%d, " |
| 709 | "skipped=%d, bsn=%d, info='%s'\n", |
| 710 | name(), m_window.v_a(), m_window.v_s(), lost, received, |
| 711 | skipped, bsn, info); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 712 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 713 | res->received_packets = received_packets; |
| 714 | res->lost_packets = lost_packets; |
| 715 | res->received_bytes = received_bytes; |
| 716 | res->lost_bytes = lost_bytes; |
| 717 | |
Jacob Erlbeck | 144a1d0 | 2015-06-04 16:51:44 +0200 | [diff] [blame] | 718 | if (lost + received <= 1) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 719 | return -1; |
| 720 | |
| 721 | return lost * 100 / (lost + received); |
| 722 | } |
| 723 | |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 724 | int gprs_rlcmac_dl_tbf::update_window(unsigned first_bsn, |
| 725 | const struct bitvec *rbb) |
| 726 | { |
| 727 | int16_t dist; /* must be signed */ |
| 728 | uint16_t lost = 0, received = 0; |
| 729 | char show_v_b[RLC_MAX_SNS + 1]; |
| 730 | char show_rbb[RLC_MAX_SNS + 1]; |
| 731 | int error_rate; |
| 732 | struct ana_result ana_res; |
| 733 | unsigned num_blocks = rbb->cur_bit; |
| 734 | unsigned behind_last_bsn = m_window.mod_sns(first_bsn + num_blocks); |
| 735 | |
| 736 | Decoding::extract_rbb(rbb, show_rbb); |
| 737 | /* show received array in debug */ |
| 738 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
| 739 | "(BSN=%d) R=ACK I=NACK\n", first_bsn, |
| 740 | show_rbb, m_window.mod_sns(behind_last_bsn - 1)); |
| 741 | |
| 742 | /* apply received array to receive state (first_bsn..behind_last_bsn-1) */ |
| 743 | if (num_blocks > 0) { |
| 744 | /* calculate distance of ssn from V(S) */ |
| 745 | dist = m_window.mod_sns(m_window.v_s() - behind_last_bsn); |
| 746 | /* check if distance is less than distance V(A)..V(S) */ |
| 747 | if (dist >= m_window.distance()) { |
| 748 | /* this might happpen, if the downlink assignment |
| 749 | * was not received by ms and the ack refers |
| 750 | * to previous TBF |
| 751 | * FIXME: we should implement polling for |
| 752 | * control ack! |
| 753 | * TODO: check whether this FIXME still makes sense |
| 754 | */ |
| 755 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 756 | "V(A)..V(S) range %s Free TBF!\n", tbf_name(this)); |
| 757 | return 1; /* indicate to free TBF */ |
| 758 | } |
| 759 | } |
| 760 | |
| 761 | error_rate = analyse_errors(show_rbb, behind_last_bsn, &ana_res); |
| 762 | |
| 763 | if (bts_data()->cs_adj_enabled && ms()) |
| 764 | ms()->update_error_rate(this, error_rate); |
| 765 | |
| 766 | m_window.update(bts, rbb, first_bsn, &lost, &received); |
| 767 | |
| 768 | /* report lost and received packets */ |
| 769 | gprs_rlcmac_received_lost(this, received, lost); |
| 770 | |
| 771 | /* Used to measure the leak rate */ |
| 772 | gprs_bssgp_update_bytes_received(ana_res.received_bytes, |
| 773 | ana_res.received_packets + ana_res.lost_packets); |
| 774 | |
| 775 | /* raise V(A), if possible */ |
| 776 | m_window.raise(m_window.move_window()); |
| 777 | |
| 778 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 779 | m_window.show_state(show_v_b); |
| 780 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 781 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 782 | "X=Resend-Unacked I=Invalid\n", |
| 783 | m_window.v_a(), show_v_b, |
| 784 | m_window.v_s_mod(-1)); |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 785 | return 0; |
| 786 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 787 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 788 | int gprs_rlcmac_dl_tbf::update_window(const uint8_t ssn, const uint8_t *rbb) |
| 789 | { |
| 790 | int16_t dist; /* must be signed */ |
| 791 | uint16_t lost = 0, received = 0; |
| 792 | char show_rbb[65]; |
| 793 | char show_v_b[RLC_MAX_SNS + 1]; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 794 | int error_rate; |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 795 | struct ana_result ana_res; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 796 | |
| 797 | Decoding::extract_rbb(rbb, show_rbb); |
| 798 | /* show received array in debug (bit 64..1) */ |
| 799 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 800 | "(BSN=%d) R=ACK I=NACK\n", m_window.mod_sns(ssn - 64), |
| 801 | show_rbb, m_window.mod_sns(ssn - 1)); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 802 | |
| 803 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 804 | /* calculate distance of ssn from V(S) */ |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 805 | dist = m_window.mod_sns(m_window.v_s() - ssn); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 806 | /* check if distance is less than distance V(A)..V(S) */ |
| 807 | if (dist >= m_window.distance()) { |
| 808 | /* this might happpen, if the downlink assignment |
| 809 | * was not received by ms and the ack refers |
| 810 | * to previous TBF |
| 811 | * FIXME: we should implement polling for |
| 812 | * control ack!*/ |
| 813 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 814 | "V(A)..V(S) range %s Free TBF!\n", tbf_name(this)); |
| 815 | return 1; /* indicate to free TBF */ |
| 816 | } |
| 817 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 818 | error_rate = analyse_errors(show_rbb, ssn, &ana_res); |
| 819 | |
| 820 | if (bts_data()->cs_adj_enabled && ms()) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 821 | ms()->update_error_rate(this, error_rate); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 822 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 823 | m_window.update(bts, show_rbb, ssn, |
| 824 | &lost, &received); |
| 825 | |
| 826 | /* report lost and received packets */ |
| 827 | gprs_rlcmac_received_lost(this, received, lost); |
| 828 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 829 | /* Used to measure the leak rate */ |
| 830 | gprs_bssgp_update_bytes_received(ana_res.received_bytes, |
| 831 | ana_res.received_packets + ana_res.lost_packets); |
| 832 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 833 | /* raise V(A), if possible */ |
| 834 | m_window.raise(m_window.move_window()); |
| 835 | |
| 836 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 837 | m_window.show_state(show_v_b); |
| 838 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 839 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 840 | "X=Resend-Unacked I=Invalid\n", |
| 841 | m_window.v_a(), show_v_b, |
| 842 | m_window.v_s_mod(-1)); |
| 843 | |
| 844 | if (state_is(GPRS_RLCMAC_FINISHED) && m_window.window_empty()) { |
| 845 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 846 | "all blocks, but without final ack " |
| 847 | "inidcation (don't worry)\n"); |
| 848 | } |
| 849 | return 0; |
| 850 | } |
| 851 | |
| 852 | |
| 853 | int gprs_rlcmac_dl_tbf::maybe_start_new_window() |
| 854 | { |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 855 | release(); |
| 856 | |
| 857 | /* check for LLC PDU in the LLC Queue */ |
| 858 | if (llc_queue()->size() > 0) |
| 859 | /* we have more data so we will re-use this tbf */ |
| 860 | establish_dl_tbf_on_pacch(); |
| 861 | |
| 862 | return 0; |
| 863 | } |
| 864 | |
| 865 | int gprs_rlcmac_dl_tbf::release() |
| 866 | { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 867 | uint16_t received; |
| 868 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 869 | /* range V(A)..V(S)-1 */ |
| 870 | received = m_window.count_unacked(); |
| 871 | |
| 872 | /* report all outstanding packets as received */ |
| 873 | gprs_rlcmac_received_lost(this, received, 0); |
| 874 | |
| 875 | set_state(GPRS_RLCMAC_WAIT_RELEASE); |
| 876 | |
Jacob Erlbeck | 04e72d3 | 2015-08-13 18:36:56 +0200 | [diff] [blame] | 877 | /* start T3193 */ |
| 878 | tbf_timer_start(this, 3193, |
| 879 | bts_data()->t3193_msec / 1000, |
| 880 | (bts_data()->t3193_msec % 1000) * 1000); |
| 881 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 882 | /* reset rlc states */ |
| 883 | m_tx_counter = 0; |
| 884 | m_wait_confirm = 0; |
| 885 | m_window.reset(); |
| 886 | |
| 887 | /* keep to flags */ |
| 888 | state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; |
| 889 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
| 890 | |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 891 | return 0; |
| 892 | } |
| 893 | |
| 894 | |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 895 | int gprs_rlcmac_dl_tbf::rcvd_dl_ack(uint8_t final_ack, unsigned first_bsn, |
| 896 | struct bitvec *rbb) |
| 897 | { |
Jacob Erlbeck | b4beb54 | 2016-01-15 13:38:31 +0100 | [diff] [blame] | 898 | int rc; |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 899 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this)); |
| 900 | |
Jacob Erlbeck | b4beb54 | 2016-01-15 13:38:31 +0100 | [diff] [blame] | 901 | rc = update_window(first_bsn, rbb); |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 902 | |
Jacob Erlbeck | b4beb54 | 2016-01-15 13:38:31 +0100 | [diff] [blame] | 903 | if (final_ack) { |
| 904 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 905 | rc = maybe_start_new_window(); |
| 906 | } else if (state_is(GPRS_RLCMAC_FINISHED) && m_window.window_empty()) { |
| 907 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 908 | "all blocks, but without final ack " |
| 909 | "indication (don't worry)\n"); |
| 910 | } |
| 911 | |
| 912 | return rc; |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 913 | } |
| 914 | |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 915 | int gprs_rlcmac_dl_tbf::rcvd_dl_ack(uint8_t final_ack, uint8_t ssn, uint8_t *rbb) |
| 916 | { |
| 917 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this)); |
| 918 | |
| 919 | if (!final_ack) |
| 920 | return update_window(ssn, rbb); |
| 921 | |
| 922 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 923 | return maybe_start_new_window(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 924 | } |
| 925 | |
| 926 | bool gprs_rlcmac_dl_tbf::dl_window_stalled() const |
| 927 | { |
| 928 | return m_window.window_stalled(); |
| 929 | } |
| 930 | |
Jacob Erlbeck | eceb910 | 2015-03-20 14:41:50 +0100 | [diff] [blame] | 931 | void gprs_rlcmac_dl_tbf::request_dl_ack() |
| 932 | { |
| 933 | m_dl_ack_requested = true; |
| 934 | } |
| 935 | |
| 936 | bool gprs_rlcmac_dl_tbf::need_control_ts() const |
| 937 | { |
| 938 | if (poll_state != GPRS_RLCMAC_POLL_NONE) |
| 939 | return false; |
| 940 | |
| 941 | return state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK) || |
| 942 | m_tx_counter >= POLL_ACK_AFTER_FRAMES || |
| 943 | m_dl_ack_requested; |
| 944 | } |
| 945 | |
| 946 | bool gprs_rlcmac_dl_tbf::have_data() const |
| 947 | { |
Jacob Erlbeck | 489a2b3 | 2015-05-28 19:07:01 +0200 | [diff] [blame] | 948 | return m_llc.chunk_size() > 0 || |
| 949 | (llc_queue() && llc_queue()->size() > 0); |
Jacob Erlbeck | eceb910 | 2015-03-20 14:41:50 +0100 | [diff] [blame] | 950 | } |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 951 | |
| 952 | int gprs_rlcmac_dl_tbf::frames_since_last_poll(unsigned fn) const |
| 953 | { |
| 954 | unsigned wrapped; |
| 955 | if (m_last_dl_poll_fn < 0) |
| 956 | return -1; |
| 957 | |
| 958 | wrapped = (fn + 2715648 - m_last_dl_poll_fn) % 2715648; |
| 959 | if (wrapped < 2715648/2) |
| 960 | return wrapped; |
| 961 | else |
| 962 | return wrapped - 2715648; |
| 963 | } |
| 964 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 965 | int gprs_rlcmac_dl_tbf::frames_since_last_drain(unsigned fn) const |
| 966 | { |
| 967 | unsigned wrapped; |
| 968 | if (m_last_dl_drained_fn < 0) |
| 969 | return -1; |
| 970 | |
| 971 | wrapped = (fn + 2715648 - m_last_dl_drained_fn) % 2715648; |
| 972 | if (wrapped < 2715648/2) |
| 973 | return wrapped; |
| 974 | else |
| 975 | return wrapped - 2715648; |
| 976 | } |
| 977 | |
| 978 | bool gprs_rlcmac_dl_tbf::keep_open(unsigned fn) const |
| 979 | { |
| 980 | int keep_time_frames; |
| 981 | |
| 982 | if (bts_data()->dl_tbf_idle_msec <= 0) |
| 983 | return false; |
| 984 | |
| 985 | keep_time_frames = msecs_to_frames(bts_data()->dl_tbf_idle_msec); |
| 986 | return frames_since_last_drain(fn) <= keep_time_frames; |
| 987 | } |