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> |
| 30 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 31 | #include "pcu_utils.h" |
| 32 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 33 | extern "C" { |
| 34 | #include <osmocom/core/msgb.h> |
| 35 | #include <osmocom/core/talloc.h> |
| 36 | } |
| 37 | |
| 38 | #include <errno.h> |
| 39 | #include <string.h> |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 40 | #include <math.h> |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 41 | |
| 42 | /* After sending these frames, we poll for ack/nack. */ |
| 43 | #define POLL_ACK_AFTER_FRAMES 20 |
| 44 | |
| 45 | |
| 46 | static const struct gprs_rlcmac_cs gprs_rlcmac_cs[] = { |
| 47 | /* frame length data block max payload */ |
| 48 | { 0, 0, 0 }, |
| 49 | { 23, 23, 20 }, /* CS-1 */ |
| 50 | { 34, 33, 30 }, /* CS-2 */ |
| 51 | { 40, 39, 36 }, /* CS-3 */ |
| 52 | { 54, 53, 50 }, /* CS-4 */ |
| 53 | }; |
| 54 | |
| 55 | extern "C" { |
| 56 | int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, |
| 57 | uint8_t num_frames, uint32_t num_octets); |
| 58 | } |
| 59 | |
| 60 | static inline void tbf_update_ms_class(struct gprs_rlcmac_tbf *tbf, |
| 61 | const uint8_t ms_class) |
| 62 | { |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 63 | if (!tbf->ms_class() && ms_class) |
| 64 | tbf->set_ms_class(ms_class); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 65 | } |
| 66 | |
Jacob Erlbeck | d0261b7 | 2015-04-02 13:58:09 +0200 | [diff] [blame] | 67 | static void llc_timer_cb(void *_tbf) |
| 68 | { |
| 69 | struct gprs_rlcmac_dl_tbf *tbf = (struct gprs_rlcmac_dl_tbf *)_tbf; |
| 70 | |
| 71 | if (tbf->state_is_not(GPRS_RLCMAC_FLOW)) |
| 72 | return; |
| 73 | |
| 74 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 75 | "%s LLC receive timeout, requesting DL ACK\n", tbf_name(tbf)); |
| 76 | |
| 77 | tbf->request_dl_ack(); |
| 78 | } |
| 79 | |
| 80 | void gprs_rlcmac_dl_tbf::cleanup() |
| 81 | { |
| 82 | osmo_timer_del(&m_llc_timer); |
| 83 | } |
| 84 | |
| 85 | void gprs_rlcmac_dl_tbf::start_llc_timer() |
| 86 | { |
| 87 | if (bts_data()->llc_idle_ack_csec > 0) { |
| 88 | struct timeval tv; |
| 89 | |
| 90 | /* TODO: this ought to be within a constructor */ |
| 91 | m_llc_timer.data = this; |
| 92 | m_llc_timer.cb = &llc_timer_cb; |
| 93 | |
| 94 | csecs_to_timeval(bts_data()->llc_idle_ack_csec, &tv); |
| 95 | osmo_timer_schedule(&m_llc_timer, tv.tv_sec, tv.tv_usec); |
| 96 | } |
| 97 | } |
| 98 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 99 | int gprs_rlcmac_dl_tbf::append_data(const uint8_t ms_class, |
| 100 | const uint16_t pdu_delay_csec, |
| 101 | const uint8_t *data, const uint16_t len) |
| 102 | { |
| 103 | LOGP(DRLCMAC, LOGL_INFO, "%s append\n", tbf_name(this)); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 104 | gprs_llc_queue::MetaInfo info; |
| 105 | struct msgb *llc_msg = msgb_alloc(len, "llc_pdu_queue"); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 106 | if (!llc_msg) |
| 107 | return -ENOMEM; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 108 | |
| 109 | gprs_llc_queue::calc_pdu_lifetime(bts, pdu_delay_csec, &info.expire_time); |
| 110 | gettimeofday(&info.recv_time, NULL); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 111 | memcpy(msgb_put(llc_msg, len), data, len); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 112 | llc_queue()->enqueue(llc_msg, &info); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 113 | tbf_update_ms_class(this, ms_class); |
| 114 | start_llc_timer(); |
| 115 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 116 | if (state_is(GPRS_RLCMAC_WAIT_RELEASE)) { |
| 117 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 118 | "%s in WAIT RELEASE state " |
| 119 | "(T3193), so reuse TBF\n", tbf_name(this)); |
| 120 | tbf_update_ms_class(this, ms_class); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 121 | reuse_tbf(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 127 | static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts, |
| 128 | const char *imsi, |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 129 | const uint32_t tlli, const uint32_t tlli_old, |
| 130 | const uint8_t ms_class, |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 131 | struct gprs_rlcmac_dl_tbf **tbf) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 132 | { |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 133 | uint8_t ss; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 134 | int8_t use_trx; |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 135 | uint16_t ta = 0; |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 136 | struct gprs_rlcmac_ul_tbf *ul_tbf = NULL, *old_ul_tbf; |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 137 | struct gprs_rlcmac_dl_tbf *dl_tbf = NULL; |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 138 | GprsMs *ms; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 139 | |
| 140 | /* check for uplink data, so we copy our informations */ |
| 141 | #warning "Do the same look up for IMSI, TLLI and OLD_TLLI" |
| 142 | #warning "Refactor the below lines... into a new method" |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 143 | ms = bts->bts->ms_store().get_ms(tlli, tlli_old, imsi); |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 144 | if (ms) { |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 145 | ul_tbf = ms->ul_tbf(); |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 146 | ta = ms->ta(); |
| 147 | } |
Jacob Erlbeck | e2e004e | 2015-06-18 17:16:26 +0200 | [diff] [blame] | 148 | /* TODO: if (!ms) create MS before tbf_alloc is called? */ |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 149 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 150 | if (ul_tbf && ul_tbf->m_contention_resolution_done |
| 151 | && !ul_tbf->m_final_ack_sent) { |
| 152 | use_trx = ul_tbf->trx->trx_no; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 153 | ss = 0; |
| 154 | old_ul_tbf = ul_tbf; |
| 155 | } else { |
| 156 | use_trx = -1; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 157 | ss = 1; /* PCH assignment only allows one timeslot */ |
| 158 | old_ul_tbf = NULL; |
| 159 | } |
| 160 | |
| 161 | // Create new TBF (any TRX) |
| 162 | #warning "Copy and paste with alloc_ul_tbf" |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 163 | /* set number of downlink slots according to multislot class */ |
| 164 | dl_tbf = tbf_alloc_dl_tbf(bts, ms, use_trx, ms_class, ss); |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 165 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 166 | if (!dl_tbf) { |
| 167 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 168 | return -EBUSY; |
| 169 | } |
Jacob Erlbeck | be0cbc1 | 2015-05-18 14:35:11 +0200 | [diff] [blame] | 170 | dl_tbf->update_ms(tlli, GPRS_RLCMAC_DL_TBF); |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 171 | dl_tbf->ms()->set_ta(ta); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 172 | |
| 173 | LOGP(DRLCMAC, LOGL_DEBUG, "%s [DOWNLINK] START\n", tbf_name(dl_tbf)); |
| 174 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 175 | /* Store IMSI for later look-up and PCH retransmission */ |
| 176 | dl_tbf->assign_imsi(imsi); |
| 177 | |
| 178 | /* trigger downlink assignment and set state to ASSIGN. |
| 179 | * we don't use old_downlink, so the possible uplink is used |
| 180 | * to trigger downlink assignment. if there is no uplink, |
| 181 | * AGCH is used. */ |
Jacob Erlbeck | 71e5511 | 2015-05-21 11:10:15 +0200 | [diff] [blame] | 182 | dl_tbf->bts->trigger_dl_ass(dl_tbf, old_ul_tbf); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 183 | *tbf = dl_tbf; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * TODO: split into unit test-able parts... |
| 189 | */ |
| 190 | int gprs_rlcmac_dl_tbf::handle(struct gprs_rlcmac_bts *bts, |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 191 | const uint32_t tlli, const uint32_t tlli_old, const char *imsi, |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 192 | const uint8_t ms_class, const uint16_t delay_csec, |
| 193 | const uint8_t *data, const uint16_t len) |
| 194 | { |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 195 | struct gprs_rlcmac_dl_tbf *dl_tbf = NULL; |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 196 | int rc; |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 197 | GprsMs *ms, *ms_old; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 198 | |
| 199 | /* check for existing TBF */ |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 200 | ms = bts->bts->ms_store().get_ms(tlli, tlli_old, imsi); |
| 201 | if (ms) |
| 202 | dl_tbf = ms->dl_tbf(); |
| 203 | |
| 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 | |
| 233 | ms_old->reset(); |
| 234 | } |
| 235 | } |
| 236 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 237 | if (!dl_tbf) { |
| 238 | rc = tbf_new_dl_assignment(bts, imsi, tlli, tlli_old, ms_class, |
| 239 | &dl_tbf); |
| 240 | if (rc < 0) |
| 241 | return rc; |
| 242 | } |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 243 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 244 | rc = dl_tbf->append_data(ms_class, delay_csec, data, len); |
Jacob Erlbeck | af9a39d | 2015-08-16 21:27:34 +0200 | [diff] [blame] | 245 | dl_tbf->update_ms(tlli, GPRS_RLCMAC_DL_TBF); |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 246 | dl_tbf->assign_imsi(imsi); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 247 | |
| 248 | return rc; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | struct msgb *gprs_rlcmac_dl_tbf::llc_dequeue(bssgp_bvc_ctx *bctx) |
| 252 | { |
| 253 | struct msgb *msg; |
Jacob Erlbeck | 6e4ccec | 2015-05-06 14:24:36 +0200 | [diff] [blame] | 254 | struct timeval tv_now, tv_now2; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 255 | uint32_t octets = 0, frames = 0; |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 256 | struct timeval hyst_delta = {0, 0}; |
| 257 | const unsigned keep_small_thresh = 60; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 258 | const gprs_llc_queue::MetaInfo *info; |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 259 | |
| 260 | if (bts_data()->llc_discard_csec) |
| 261 | csecs_to_timeval(bts_data()->llc_discard_csec, &hyst_delta); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 262 | |
| 263 | gettimeofday(&tv_now, NULL); |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 264 | timeradd(&tv_now, &hyst_delta, &tv_now2); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 265 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 266 | while ((msg = llc_queue()->dequeue(&info))) { |
| 267 | const struct timeval *tv_disc = &info->expire_time; |
| 268 | const struct timeval *tv_recv = &info->recv_time; |
Jacob Erlbeck | 6e4ccec | 2015-05-06 14:24:36 +0200 | [diff] [blame] | 269 | |
| 270 | gprs_bssgp_update_queue_delay(tv_recv, &tv_now); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 271 | |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 272 | if (ms() && ms()->codel_state()) { |
| 273 | int bytes = llc_queue()->octets(); |
| 274 | if (gprs_codel_control(ms()->codel_state(), |
| 275 | tv_recv, &tv_now, bytes)) |
| 276 | goto drop_frame; |
| 277 | } |
| 278 | |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 279 | /* Is the age below the low water mark? */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 280 | if (!gprs_llc_queue::is_frame_expired(&tv_now2, tv_disc)) |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 281 | break; |
| 282 | |
| 283 | /* Is the age below the high water mark */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 284 | if (!gprs_llc_queue::is_frame_expired(&tv_now, tv_disc)) { |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 285 | /* Has the previous message not been dropped? */ |
| 286 | if (frames == 0) |
| 287 | break; |
| 288 | |
| 289 | /* Hysteresis mode, try to discard LLC messages until |
| 290 | * the low water mark has been reached */ |
| 291 | |
| 292 | /* Check whether to abort the hysteresis mode */ |
| 293 | |
| 294 | /* Is the frame small, perhaps only a TCP ACK? */ |
| 295 | if (msg->len <= keep_small_thresh) |
| 296 | break; |
| 297 | |
| 298 | /* Is it a GMM message? */ |
| 299 | if (!gprs_llc::is_user_data_frame(msg->data, msg->len)) |
| 300 | break; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 301 | } |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 302 | |
| 303 | bts->llc_timedout_frame(); |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 304 | drop_frame: |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 305 | frames++; |
| 306 | octets += msg->len; |
| 307 | msgb_free(msg); |
Jacob Erlbeck | 29d91e9 | 2015-04-29 14:46:52 +0200 | [diff] [blame] | 308 | bts->llc_dropped_frame(); |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 309 | continue; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | if (frames) { |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 313 | LOGP(DRLCMACDL, LOGL_NOTICE, "%s Discarding LLC PDU " |
| 314 | "because lifetime limit reached, " |
| 315 | "count=%u new_queue_size=%zu\n", |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 316 | tbf_name(this), frames, llc_queue()->size()); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 317 | if (frames > 0xff) |
| 318 | frames = 0xff; |
| 319 | if (octets > 0xffffff) |
| 320 | octets = 0xffffff; |
Jacob Erlbeck | 767193e | 2015-05-20 12:06:46 +0200 | [diff] [blame] | 321 | bssgp_tx_llc_discarded(bctx, tlli(), frames, octets); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | return msg; |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * Create DL data block |
| 329 | * The messages are fragmented and forwarded as data blocks. |
| 330 | */ |
| 331 | struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block(uint32_t fn, uint8_t ts) |
| 332 | { |
| 333 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink (V(A)==%d .. " |
| 334 | "V(S)==%d)\n", tbf_name(this), |
| 335 | m_window.v_a(), m_window.v_s()); |
| 336 | |
| 337 | do_resend: |
| 338 | /* check if there is a block with negative acknowledgement */ |
| 339 | int resend_bsn = m_window.resend_needed(); |
| 340 | if (resend_bsn >= 0) { |
| 341 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", resend_bsn); |
| 342 | /* re-send block with negative aknowlegement */ |
| 343 | m_window.m_v_b.mark_unacked(resend_bsn); |
| 344 | bts->rlc_resent(); |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 345 | return create_dl_acked_block(fn, ts, resend_bsn); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 346 | } |
| 347 | |
| 348 | /* if the window has stalled, or transfer is complete, |
| 349 | * send an unacknowledged block */ |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 350 | if (state_is(GPRS_RLCMAC_FINISHED)) { |
| 351 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 352 | "because all blocks have been transmitted.\n", |
| 353 | m_window.v_a()); |
| 354 | bts->rlc_restarted(); |
| 355 | } else if (dl_window_stalled()) { |
| 356 | LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
| 357 | "because all window is stalled.\n", |
| 358 | m_window.v_a()); |
| 359 | bts->rlc_stalled(); |
Jacob Erlbeck | e25b5b9 | 2015-03-19 14:21:33 +0100 | [diff] [blame] | 360 | } else if (have_data()) { |
| 361 | /* New blocks may be send */ |
| 362 | return create_new_bsn(fn, ts); |
| 363 | } else if (!m_window.window_empty()) { |
| 364 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 365 | "because all blocks have been transmitted (FLOW).\n", |
| 366 | m_window.v_a()); |
| 367 | bts->rlc_restarted(); |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 368 | } else { |
Jacob Erlbeck | e25b5b9 | 2015-03-19 14:21:33 +0100 | [diff] [blame] | 369 | /* Nothing left to send, create dummy LLC commands */ |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 370 | return create_new_bsn(fn, ts); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 371 | } |
| 372 | |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 373 | /* If V(S) == V(A) and finished state, we would have received |
| 374 | * acknowledgement of all transmitted block. In this case we |
| 375 | * would have transmitted the final block, and received ack |
| 376 | * from MS. But in this case we did not receive the final ack |
| 377 | * indication from MS. This should never happen if MS works |
| 378 | * correctly. */ |
| 379 | if (m_window.window_empty()) { |
| 380 | LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks, " |
| 381 | "so we re-transmit final block!\n"); |
| 382 | /* we just send final block again */ |
| 383 | int16_t index = m_window.v_s_mod(-1); |
| 384 | bts->rlc_resent(); |
| 385 | return create_dl_acked_block(fn, ts, index); |
| 386 | } |
| 387 | |
| 388 | /* cycle through all unacked blocks */ |
| 389 | int resend = m_window.mark_for_resend(); |
| 390 | |
| 391 | /* At this point there should be at least one unacked block |
| 392 | * to be resent. If not, this is an software error. */ |
| 393 | if (resend == 0) { |
| 394 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 395 | "There are no unacknowledged blocks, but V(A) " |
| 396 | " != V(S). PLEASE FIX!\n"); |
| 397 | /* we just send final block again */ |
| 398 | int16_t index = m_window.v_s_mod(-1); |
| 399 | return create_dl_acked_block(fn, ts, index); |
| 400 | } |
| 401 | goto do_resend; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 402 | } |
| 403 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 404 | void gprs_rlcmac_dl_tbf::schedule_next_frame() |
| 405 | { |
| 406 | struct msgb *msg; |
| 407 | |
| 408 | if (m_llc.frame_length() != 0) |
| 409 | return; |
| 410 | |
| 411 | /* dequeue next LLC frame, if any */ |
| 412 | msg = llc_dequeue(gprs_bssgp_pcu_current_bctx()); |
| 413 | if (!msg) |
| 414 | return; |
| 415 | |
| 416 | LOGP(DRLCMACDL, LOGL_INFO, |
| 417 | "- Dequeue next LLC for %s (len=%d)\n", |
| 418 | tbf_name(this), msg->len); |
| 419 | |
| 420 | m_llc.put_frame(msg->data, msg->len); |
| 421 | bts->llc_frame_sched(); |
| 422 | msgb_free(msg); |
| 423 | m_last_dl_drained_fn = -1; |
| 424 | } |
| 425 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 426 | struct msgb *gprs_rlcmac_dl_tbf::create_new_bsn(const uint32_t fn, const uint8_t ts) |
| 427 | { |
| 428 | struct rlc_dl_header *rh; |
| 429 | struct rlc_li_field *li; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 430 | uint8_t *delimiter, *data, *e_pointer; |
| 431 | uint16_t space, chunk; |
| 432 | gprs_rlc_data *rlc_data; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 433 | const uint16_t bsn = m_window.v_s(); |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 434 | uint8_t cs = 1; |
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 | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 439 | cs = current_cs(); |
| 440 | |
Jacob Erlbeck | e1d2b35 | 2015-06-12 10:48:05 +0200 | [diff] [blame] | 441 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d, CS=%d\n", |
| 442 | m_window.v_s(), cs); |
| 443 | |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 444 | OSMO_ASSERT(cs >= 1); |
| 445 | OSMO_ASSERT(cs <= 4); |
| 446 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 447 | /* total length of block, including spare bits */ |
| 448 | const uint8_t block_length = gprs_rlcmac_cs[cs].block_length; |
| 449 | /* length of usable data of block, w/o spare bits, inc. MAC */ |
| 450 | const uint8_t block_data_len = gprs_rlcmac_cs[cs].block_data; |
| 451 | |
| 452 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 453 | rlc_data = m_rlc.block(bsn); |
| 454 | data = rlc_data->prepare(block_data_len); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 455 | rlc_data->cs = cs; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 456 | |
| 457 | rh = (struct rlc_dl_header *)data; |
| 458 | rh->pt = 0; /* Data Block */ |
| 459 | rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */ |
| 460 | rh->usf = 7; /* will be set at scheduler */ |
| 461 | rh->pr = 0; /* FIXME: power reduction */ |
| 462 | rh->tfi = m_tfi; /* TFI */ |
| 463 | rh->fbi = 0; /* Final Block Indicator, set late, if true */ |
| 464 | rh->bsn = bsn; /* Block Sequence Number */ |
| 465 | rh->e = 0; /* Extension bit, maybe set later */ |
| 466 | e_pointer = data + 2; /* points to E of current chunk */ |
| 467 | data += sizeof(*rh); |
| 468 | delimiter = data; /* where next length header would be stored */ |
| 469 | space = block_data_len - sizeof(*rh); |
| 470 | while (1) { |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 471 | if (m_llc.frame_length() == 0) { |
| 472 | /* A header will need to by added, so we just need |
| 473 | * space-1 octets */ |
| 474 | m_llc.put_dummy_frame(space - 1); |
| 475 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 476 | /* The data just drained, store the current fn */ |
| 477 | if (m_last_dl_drained_fn < 0) |
| 478 | m_last_dl_drained_fn = fn; |
| 479 | |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 480 | /* It is not clear, when the next real data will |
| 481 | * arrive, so request a DL ack/nack now */ |
| 482 | request_dl_ack(); |
| 483 | |
| 484 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 485 | "-- Empty chunk, " |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 486 | "added LLC dummy command of size %d, " |
| 487 | "drained_since=%d\n", |
| 488 | m_llc.frame_length(), frames_since_last_drain(fn)); |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 489 | } |
| 490 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 491 | chunk = m_llc.chunk_size(); |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 492 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 493 | /* if chunk will exceed block limit */ |
| 494 | if (chunk > space) { |
| 495 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 496 | "larger than space (%d) left in block: copy " |
| 497 | "only remaining space, and we are done\n", |
| 498 | chunk, space); |
| 499 | /* block is filled, so there is no extension */ |
| 500 | *e_pointer |= 0x01; |
| 501 | /* fill only space */ |
| 502 | m_llc.consume(data, space); |
| 503 | /* return data block as message */ |
| 504 | break; |
| 505 | } |
| 506 | /* if FINAL chunk would fit precisely in space left */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 507 | if (chunk == space && llc_queue()->size() == 0 && !keep_open(fn)) |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 508 | { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 509 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 510 | "would exactly fit into space (%d): because " |
| 511 | "this is a final block, we don't add length " |
| 512 | "header, and we are done\n", chunk, space); |
| 513 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for " |
| 514 | "%s that fits precisely in last block: " |
| 515 | "len=%d\n", tbf_name(this), m_llc.frame_length()); |
| 516 | gprs_rlcmac_dl_bw(this, m_llc.frame_length()); |
| 517 | /* block is filled, so there is no extension */ |
| 518 | *e_pointer |= 0x01; |
| 519 | /* fill space */ |
| 520 | m_llc.consume(data, space); |
| 521 | m_llc.reset(); |
| 522 | /* final block */ |
| 523 | rh->fbi = 1; /* we indicate final block */ |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 524 | request_dl_ack(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 525 | set_state(GPRS_RLCMAC_FINISHED); |
| 526 | /* return data block as message */ |
| 527 | break; |
| 528 | } |
| 529 | /* if chunk would fit exactly in space left */ |
| 530 | if (chunk == space) { |
| 531 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 532 | "would exactly fit into space (%d): add length " |
| 533 | "header with LI=0, to make frame extend to " |
| 534 | "next block, and we are done\n", chunk, space); |
| 535 | /* make space for delimiter */ |
| 536 | if (delimiter != data) |
| 537 | memmove(delimiter + 1, delimiter, |
| 538 | data - delimiter); |
| 539 | data++; |
| 540 | space--; |
| 541 | /* add LI with 0 length */ |
| 542 | li = (struct rlc_li_field *)delimiter; |
| 543 | li->e = 1; /* not more extension */ |
| 544 | li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| 545 | li->li = 0; /* chunk fills the complete space */ |
| 546 | // no need to set e_pointer nor increase delimiter |
| 547 | /* fill only space, which is 1 octet less than chunk */ |
| 548 | m_llc.consume(data, space); |
| 549 | /* return data block as message */ |
| 550 | break; |
| 551 | } |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 552 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 553 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 554 | "than remaining space (%d): add length header to " |
| 555 | "to delimit LLC frame\n", chunk, space); |
| 556 | /* the LLC frame chunk ends in this block */ |
| 557 | /* make space for delimiter */ |
| 558 | if (delimiter != data) |
| 559 | memmove(delimiter + 1, delimiter, data - delimiter); |
| 560 | data++; |
| 561 | space--; |
| 562 | /* add LI to delimit frame */ |
| 563 | li = (struct rlc_li_field *)delimiter; |
| 564 | li->e = 0; /* Extension bit, maybe set later */ |
| 565 | li->m = 0; /* will be set later, if there is more LLC data */ |
| 566 | li->li = chunk; /* length of chunk */ |
| 567 | e_pointer = delimiter; /* points to E of current delimiter */ |
| 568 | delimiter++; |
| 569 | /* copy (rest of) LLC frame to space and reset later */ |
| 570 | m_llc.consume(data, chunk); |
| 571 | data += chunk; |
| 572 | space -= chunk; |
| 573 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for %s" |
| 574 | "len=%d\n", tbf_name(this), m_llc.frame_length()); |
| 575 | gprs_rlcmac_dl_bw(this, m_llc.frame_length()); |
| 576 | m_llc.reset(); |
| 577 | /* dequeue next LLC frame, if any */ |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 578 | schedule_next_frame(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 579 | /* if we have more data and we have space left */ |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 580 | if (space > 0 && (m_llc.frame_length() || keep_open(fn))) { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 581 | li->m = 1; /* we indicate more frames to follow */ |
| 582 | continue; |
| 583 | } |
| 584 | /* if we don't have more LLC frames */ |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 585 | if (!m_llc.frame_length() && !keep_open(fn)) { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 586 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
| 587 | "done.\n"); |
| 588 | li->e = 1; /* we cannot extend */ |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 589 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 590 | rh->fbi = 1; /* we indicate final block */ |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 591 | request_dl_ack(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 592 | set_state(GPRS_RLCMAC_FINISHED); |
| 593 | break; |
| 594 | } |
| 595 | /* we have no space left */ |
| 596 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
| 597 | "done.\n"); |
| 598 | li->e = 1; /* we cannot extend */ |
| 599 | break; |
| 600 | } |
| 601 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n", |
| 602 | osmo_hexdump(rlc_data->block, block_length)); |
| 603 | #warning "move this up?" |
| 604 | rlc_data->len = block_length; |
| 605 | /* raise send state and set ack state array */ |
| 606 | m_window.m_v_b.mark_unacked(bsn); |
| 607 | m_window.increment_send(); |
| 608 | |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 609 | return create_dl_acked_block(fn, ts, bsn); |
| 610 | } |
| 611 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 612 | struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block( |
| 613 | const uint32_t fn, const uint8_t ts, |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 614 | const int index) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 615 | { |
| 616 | uint8_t *data; |
| 617 | struct rlc_dl_header *rh; |
| 618 | struct msgb *dl_msg; |
| 619 | uint8_t len; |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 620 | bool need_poll; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 621 | |
| 622 | /* get data and header from current block */ |
| 623 | data = m_rlc.block(index)->block; |
| 624 | len = m_rlc.block(index)->len; |
| 625 | rh = (struct rlc_dl_header *)data; |
| 626 | |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 627 | /* If the TBF has just started, relate frames_since_last_poll to the |
| 628 | * current fn */ |
| 629 | if (m_last_dl_poll_fn < 0) |
| 630 | m_last_dl_poll_fn = fn; |
| 631 | |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 632 | need_poll = state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 633 | /* Clear Polling, if still set in history buffer */ |
| 634 | rh->s_p = 0; |
| 635 | |
| 636 | /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| 637 | */ |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 638 | if (m_tx_counter >= POLL_ACK_AFTER_FRAMES || m_dl_ack_requested || |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 639 | need_poll) { |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 640 | if (m_dl_ack_requested) { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 641 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 642 | "polling, because is was requested explicitly " |
| 643 | "(e.g. first final block sent).\n"); |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 644 | } else if (need_poll) { |
| 645 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Daniel Willmann | 635d47c | 2014-09-17 17:58:29 +0200 | [diff] [blame] | 646 | "polling, because polling timed out.\n"); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 647 | } else { |
| 648 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 649 | "polling, because %d blocks sent.\n", |
| 650 | POLL_ACK_AFTER_FRAMES); |
| 651 | } |
| 652 | /* scheduling not possible, because: */ |
| 653 | if (poll_state != GPRS_RLCMAC_POLL_NONE) |
| 654 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling is already " |
| 655 | "sheduled for %s, so we must wait for " |
| 656 | "requesting downlink ack\n", tbf_name(this)); |
| 657 | else if (control_ts != ts) |
| 658 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling cannot be " |
| 659 | "sheduled in this TS %d, waiting for " |
| 660 | "TS %d\n", ts, control_ts); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 661 | else if (bts->sba()->find(trx->trx_no, ts, (fn + 13) % 2715648)) |
| 662 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling cannot be " |
| 663 | "sheduled, because single block alllocation " |
| 664 | "already exists\n"); |
| 665 | else { |
| 666 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling sheduled in this " |
| 667 | "TS %d\n", ts); |
| 668 | m_tx_counter = 0; |
| 669 | /* start timer whenever we send the final block */ |
| 670 | if (rh->fbi == 1) |
| 671 | tbf_timer_start(this, 3191, bts_data()->t3191, 0); |
| 672 | |
| 673 | /* schedule polling */ |
| 674 | poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 675 | poll_fn = (fn + 13) % 2715648; |
| 676 | |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 677 | /* Clear poll timeout flag */ |
| 678 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 679 | |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 680 | /* Clear request flag */ |
| 681 | m_dl_ack_requested = false; |
| 682 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 683 | /* set polling in header */ |
| 684 | rh->rrbp = 0; /* N+13 */ |
| 685 | rh->s_p = 1; /* Polling */ |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 686 | |
| 687 | m_last_dl_poll_fn = poll_fn; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 688 | } |
| 689 | } |
| 690 | |
| 691 | /* return data block as message */ |
| 692 | dl_msg = msgb_alloc(len, "rlcmac_dl_data"); |
| 693 | if (!dl_msg) |
| 694 | return NULL; |
| 695 | |
| 696 | /* Increment TX-counter */ |
| 697 | m_tx_counter++; |
| 698 | |
| 699 | memcpy(msgb_put(dl_msg, len), data, len); |
| 700 | bts->rlc_sent(); |
| 701 | |
| 702 | return dl_msg; |
| 703 | } |
| 704 | |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 705 | static uint16_t bitnum_to_bsn(int bitnum, uint16_t ssn, uint16_t mod_sns) |
| 706 | { |
| 707 | return (ssn - 1 - bitnum) & mod_sns; |
| 708 | } |
| 709 | |
| 710 | int gprs_rlcmac_dl_tbf::analyse_errors(char *show_rbb, uint8_t ssn) |
| 711 | { |
| 712 | gprs_rlc_data *rlc_data; |
| 713 | uint16_t lost = 0, received = 0, skipped = 0; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 714 | char info[65]; |
| 715 | memset(info, '.', sizeof(info)); |
| 716 | info[64] = 0; |
| 717 | uint16_t bsn = 0; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 718 | |
| 719 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
| 720 | for (int bitpos = 0; bitpos < m_window.ws(); bitpos++) { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 721 | bsn = bitnum_to_bsn(bitpos, ssn, m_window.mod_sns()); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 722 | |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 723 | if (bsn == ((m_window.v_a() - 1) & m_window.mod_sns())) { |
| 724 | info[bitpos] = '$'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 725 | break; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 726 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 727 | |
| 728 | rlc_data = m_rlc.block(bsn); |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 729 | if (!rlc_data) { |
| 730 | info[bitpos] = '0'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 731 | continue; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 732 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 733 | |
| 734 | if (rlc_data->cs != current_cs()) { |
| 735 | /* This block has already been encoded with a different |
| 736 | * CS, so it doesn't help us to decide, whether the |
| 737 | * current CS is ok. Ignore it. */ |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 738 | info[bitpos] = 'x'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 739 | skipped += 1; |
| 740 | continue; |
| 741 | } |
| 742 | |
| 743 | if (show_rbb[m_window.ws() - 1 - bitpos] == 'R') { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 744 | if (!m_window.m_v_b.is_acked(bsn)) { |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 745 | received += 1; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 746 | info[bitpos] = 'R'; |
| 747 | } else { |
| 748 | info[bitpos] = 'r'; |
| 749 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 750 | } else { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 751 | info[bitpos] = 'L'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 752 | lost += 1; |
| 753 | } |
| 754 | } |
| 755 | |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 756 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s DL analysis, range=%d:%d, lost=%d, recv=%d, " |
| 757 | "skipped=%d, bsn=%d, info='%s'\n", |
| 758 | name(), m_window.v_a(), m_window.v_s(), lost, received, |
| 759 | skipped, bsn, info); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 760 | |
Jacob Erlbeck | 144a1d0 | 2015-06-04 16:51:44 +0200 | [diff] [blame] | 761 | if (lost + received <= 1) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 762 | return -1; |
| 763 | |
| 764 | return lost * 100 / (lost + received); |
| 765 | } |
| 766 | |
| 767 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 768 | int gprs_rlcmac_dl_tbf::update_window(const uint8_t ssn, const uint8_t *rbb) |
| 769 | { |
| 770 | int16_t dist; /* must be signed */ |
| 771 | uint16_t lost = 0, received = 0; |
| 772 | char show_rbb[65]; |
| 773 | char show_v_b[RLC_MAX_SNS + 1]; |
| 774 | const uint16_t mod_sns = m_window.mod_sns(); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 775 | int error_rate; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 776 | |
| 777 | Decoding::extract_rbb(rbb, show_rbb); |
| 778 | /* show received array in debug (bit 64..1) */ |
| 779 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
| 780 | "(BSN=%d) R=ACK I=NACK\n", (ssn - 64) & mod_sns, |
| 781 | show_rbb, (ssn - 1) & mod_sns); |
| 782 | |
| 783 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 784 | /* calculate distance of ssn from V(S) */ |
| 785 | dist = (m_window.v_s() - ssn) & mod_sns; |
| 786 | /* check if distance is less than distance V(A)..V(S) */ |
| 787 | if (dist >= m_window.distance()) { |
| 788 | /* this might happpen, if the downlink assignment |
| 789 | * was not received by ms and the ack refers |
| 790 | * to previous TBF |
| 791 | * FIXME: we should implement polling for |
| 792 | * control ack!*/ |
| 793 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 794 | "V(A)..V(S) range %s Free TBF!\n", tbf_name(this)); |
| 795 | return 1; /* indicate to free TBF */ |
| 796 | } |
| 797 | |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 798 | if (bts_data()->cs_adj_enabled && ms()) { |
| 799 | error_rate = analyse_errors(show_rbb, ssn); |
| 800 | ms()->update_error_rate(this, error_rate); |
| 801 | } |
| 802 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 803 | m_window.update(bts, show_rbb, ssn, |
| 804 | &lost, &received); |
| 805 | |
| 806 | /* report lost and received packets */ |
| 807 | gprs_rlcmac_received_lost(this, received, lost); |
| 808 | |
| 809 | /* raise V(A), if possible */ |
| 810 | m_window.raise(m_window.move_window()); |
| 811 | |
| 812 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 813 | m_window.show_state(show_v_b); |
| 814 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 815 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 816 | "X=Resend-Unacked I=Invalid\n", |
| 817 | m_window.v_a(), show_v_b, |
| 818 | m_window.v_s_mod(-1)); |
| 819 | |
| 820 | if (state_is(GPRS_RLCMAC_FINISHED) && m_window.window_empty()) { |
| 821 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 822 | "all blocks, but without final ack " |
| 823 | "inidcation (don't worry)\n"); |
| 824 | } |
| 825 | return 0; |
| 826 | } |
| 827 | |
| 828 | |
| 829 | int gprs_rlcmac_dl_tbf::maybe_start_new_window() |
| 830 | { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 831 | uint16_t received; |
| 832 | |
| 833 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 834 | /* range V(A)..V(S)-1 */ |
| 835 | received = m_window.count_unacked(); |
| 836 | |
| 837 | /* report all outstanding packets as received */ |
| 838 | gprs_rlcmac_received_lost(this, received, 0); |
| 839 | |
| 840 | set_state(GPRS_RLCMAC_WAIT_RELEASE); |
| 841 | |
Jacob Erlbeck | 04e72d3 | 2015-08-13 18:36:56 +0200 | [diff] [blame] | 842 | /* start T3193 */ |
| 843 | tbf_timer_start(this, 3193, |
| 844 | bts_data()->t3193_msec / 1000, |
| 845 | (bts_data()->t3193_msec % 1000) * 1000); |
| 846 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 847 | /* check for LLC PDU in the LLC Queue */ |
Jacob Erlbeck | 04e72d3 | 2015-08-13 18:36:56 +0200 | [diff] [blame] | 848 | if (have_data()) |
| 849 | /* we have more data so we will re-use this tbf */ |
| 850 | reuse_tbf(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 851 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 852 | return 0; |
| 853 | } |
| 854 | |
| 855 | int gprs_rlcmac_dl_tbf::rcvd_dl_ack(uint8_t final_ack, uint8_t ssn, uint8_t *rbb) |
| 856 | { |
| 857 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this)); |
| 858 | |
| 859 | if (!final_ack) |
| 860 | return update_window(ssn, rbb); |
| 861 | return maybe_start_new_window(); |
| 862 | } |
| 863 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 864 | void gprs_rlcmac_dl_tbf::reuse_tbf() |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 865 | { |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 866 | struct gprs_rlcmac_dl_tbf *new_tbf = NULL; |
Daniel Willmann | e481815 | 2014-08-15 16:52:09 +0200 | [diff] [blame] | 867 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 868 | bts->tbf_reused(); |
Daniel Willmann | e481815 | 2014-08-15 16:52:09 +0200 | [diff] [blame] | 869 | |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 870 | new_tbf = tbf_alloc_dl_tbf(bts->bts_data(), ms(), |
| 871 | this->trx->trx_no, ms_class(), 0); |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 872 | |
Daniel Willmann | e481815 | 2014-08-15 16:52:09 +0200 | [diff] [blame] | 873 | if (!new_tbf) { |
| 874 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
Daniel Willmann | e481815 | 2014-08-15 16:52:09 +0200 | [diff] [blame] | 875 | return; |
| 876 | } |
| 877 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 878 | /* reset rlc states */ |
| 879 | m_tx_counter = 0; |
| 880 | m_wait_confirm = 0; |
| 881 | m_window.reset(); |
| 882 | |
| 883 | /* keep to flags */ |
| 884 | state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; |
| 885 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
| 886 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 887 | LOGP(DRLCMAC, LOGL_DEBUG, "%s Trigger dowlink assignment on PACCH, " |
| 888 | "because another LLC PDU has arrived in between\n", |
| 889 | tbf_name(this)); |
Jacob Erlbeck | 71e5511 | 2015-05-21 11:10:15 +0200 | [diff] [blame] | 890 | bts->trigger_dl_ass(new_tbf, this); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 891 | } |
| 892 | |
| 893 | bool gprs_rlcmac_dl_tbf::dl_window_stalled() const |
| 894 | { |
| 895 | return m_window.window_stalled(); |
| 896 | } |
| 897 | |
Jacob Erlbeck | eceb910 | 2015-03-20 14:41:50 +0100 | [diff] [blame] | 898 | void gprs_rlcmac_dl_tbf::request_dl_ack() |
| 899 | { |
| 900 | m_dl_ack_requested = true; |
| 901 | } |
| 902 | |
| 903 | bool gprs_rlcmac_dl_tbf::need_control_ts() const |
| 904 | { |
| 905 | if (poll_state != GPRS_RLCMAC_POLL_NONE) |
| 906 | return false; |
| 907 | |
| 908 | return state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK) || |
| 909 | m_tx_counter >= POLL_ACK_AFTER_FRAMES || |
| 910 | m_dl_ack_requested; |
| 911 | } |
| 912 | |
| 913 | bool gprs_rlcmac_dl_tbf::have_data() const |
| 914 | { |
Jacob Erlbeck | 489a2b3 | 2015-05-28 19:07:01 +0200 | [diff] [blame] | 915 | return m_llc.chunk_size() > 0 || |
| 916 | (llc_queue() && llc_queue()->size() > 0); |
Jacob Erlbeck | eceb910 | 2015-03-20 14:41:50 +0100 | [diff] [blame] | 917 | } |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 918 | |
| 919 | int gprs_rlcmac_dl_tbf::frames_since_last_poll(unsigned fn) const |
| 920 | { |
| 921 | unsigned wrapped; |
| 922 | if (m_last_dl_poll_fn < 0) |
| 923 | return -1; |
| 924 | |
| 925 | wrapped = (fn + 2715648 - m_last_dl_poll_fn) % 2715648; |
| 926 | if (wrapped < 2715648/2) |
| 927 | return wrapped; |
| 928 | else |
| 929 | return wrapped - 2715648; |
| 930 | } |
| 931 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 932 | int gprs_rlcmac_dl_tbf::frames_since_last_drain(unsigned fn) const |
| 933 | { |
| 934 | unsigned wrapped; |
| 935 | if (m_last_dl_drained_fn < 0) |
| 936 | return -1; |
| 937 | |
| 938 | wrapped = (fn + 2715648 - m_last_dl_drained_fn) % 2715648; |
| 939 | if (wrapped < 2715648/2) |
| 940 | return wrapped; |
| 941 | else |
| 942 | return wrapped - 2715648; |
| 943 | } |
| 944 | |
| 945 | bool gprs_rlcmac_dl_tbf::keep_open(unsigned fn) const |
| 946 | { |
| 947 | int keep_time_frames; |
| 948 | |
| 949 | if (bts_data()->dl_tbf_idle_msec <= 0) |
| 950 | return false; |
| 951 | |
| 952 | keep_time_frames = msecs_to_frames(bts_data()->dl_tbf_idle_msec); |
| 953 | return frames_since_last_drain(fn) <= keep_time_frames; |
| 954 | } |