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> |
| 28 | #include <decoding.h> |
| 29 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 30 | #include "pcu_utils.h" |
| 31 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 32 | extern "C" { |
| 33 | #include <osmocom/core/msgb.h> |
| 34 | #include <osmocom/core/talloc.h> |
| 35 | } |
| 36 | |
| 37 | #include <errno.h> |
| 38 | #include <string.h> |
| 39 | |
| 40 | /* After sending these frames, we poll for ack/nack. */ |
| 41 | #define POLL_ACK_AFTER_FRAMES 20 |
| 42 | |
| 43 | |
| 44 | static const struct gprs_rlcmac_cs gprs_rlcmac_cs[] = { |
| 45 | /* frame length data block max payload */ |
| 46 | { 0, 0, 0 }, |
| 47 | { 23, 23, 20 }, /* CS-1 */ |
| 48 | { 34, 33, 30 }, /* CS-2 */ |
| 49 | { 40, 39, 36 }, /* CS-3 */ |
| 50 | { 54, 53, 50 }, /* CS-4 */ |
| 51 | }; |
| 52 | |
| 53 | extern "C" { |
| 54 | int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli, |
| 55 | uint8_t num_frames, uint32_t num_octets); |
| 56 | } |
| 57 | |
| 58 | static inline void tbf_update_ms_class(struct gprs_rlcmac_tbf *tbf, |
| 59 | const uint8_t ms_class) |
| 60 | { |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 61 | if (!tbf->ms_class() && ms_class) |
| 62 | tbf->set_ms_class(ms_class); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 63 | } |
| 64 | |
Jacob Erlbeck | d0261b7 | 2015-04-02 13:58:09 +0200 | [diff] [blame] | 65 | static void llc_timer_cb(void *_tbf) |
| 66 | { |
| 67 | struct gprs_rlcmac_dl_tbf *tbf = (struct gprs_rlcmac_dl_tbf *)_tbf; |
| 68 | |
| 69 | if (tbf->state_is_not(GPRS_RLCMAC_FLOW)) |
| 70 | return; |
| 71 | |
| 72 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 73 | "%s LLC receive timeout, requesting DL ACK\n", tbf_name(tbf)); |
| 74 | |
| 75 | tbf->request_dl_ack(); |
| 76 | } |
| 77 | |
| 78 | void gprs_rlcmac_dl_tbf::cleanup() |
| 79 | { |
| 80 | osmo_timer_del(&m_llc_timer); |
| 81 | } |
| 82 | |
| 83 | void gprs_rlcmac_dl_tbf::start_llc_timer() |
| 84 | { |
| 85 | if (bts_data()->llc_idle_ack_csec > 0) { |
| 86 | struct timeval tv; |
| 87 | |
| 88 | /* TODO: this ought to be within a constructor */ |
| 89 | m_llc_timer.data = this; |
| 90 | m_llc_timer.cb = &llc_timer_cb; |
| 91 | |
| 92 | csecs_to_timeval(bts_data()->llc_idle_ack_csec, &tv); |
| 93 | osmo_timer_schedule(&m_llc_timer, tv.tv_sec, tv.tv_usec); |
| 94 | } |
| 95 | } |
| 96 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 97 | int gprs_rlcmac_dl_tbf::append_data(const uint8_t ms_class, |
| 98 | const uint16_t pdu_delay_csec, |
| 99 | const uint8_t *data, const uint16_t len) |
| 100 | { |
| 101 | LOGP(DRLCMAC, LOGL_INFO, "%s append\n", tbf_name(this)); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 102 | gprs_llc_queue::MetaInfo info; |
| 103 | struct msgb *llc_msg = msgb_alloc(len, "llc_pdu_queue"); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 104 | if (!llc_msg) |
| 105 | return -ENOMEM; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 106 | |
| 107 | gprs_llc_queue::calc_pdu_lifetime(bts, pdu_delay_csec, &info.expire_time); |
| 108 | gettimeofday(&info.recv_time, NULL); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 109 | memcpy(msgb_put(llc_msg, len), data, len); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 110 | llc_queue()->enqueue(llc_msg, &info); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 111 | tbf_update_ms_class(this, ms_class); |
| 112 | start_llc_timer(); |
| 113 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 114 | if (state_is(GPRS_RLCMAC_WAIT_RELEASE)) { |
| 115 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 116 | "%s in WAIT RELEASE state " |
| 117 | "(T3193), so reuse TBF\n", tbf_name(this)); |
| 118 | tbf_update_ms_class(this, ms_class); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 119 | reuse_tbf(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | static struct gprs_rlcmac_dl_tbf *tbf_lookup_dl(BTS *bts, |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 126 | const uint32_t tlli, const uint32_t tlli_old, |
| 127 | const char *imsi) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 128 | { |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 129 | GprsMs *ms = bts->ms_store().get_ms(tlli, tlli_old, imsi); |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 130 | if (!ms) |
| 131 | return NULL; |
| 132 | |
| 133 | return ms->dl_tbf(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts, |
| 137 | const char *imsi, |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 138 | const uint32_t tlli, const uint32_t tlli_old, |
| 139 | const uint8_t ms_class, |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 140 | struct gprs_rlcmac_dl_tbf **tbf) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 141 | { |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 142 | uint8_t trx, ss; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 143 | int8_t use_trx; |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 144 | uint16_t ta = 0; |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 145 | struct gprs_rlcmac_ul_tbf *ul_tbf = NULL, *old_ul_tbf; |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 146 | struct gprs_rlcmac_dl_tbf *dl_tbf = NULL; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 147 | int8_t tfi; /* must be signed */ |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 148 | GprsMs *ms; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 149 | |
| 150 | /* check for uplink data, so we copy our informations */ |
| 151 | #warning "Do the same look up for IMSI, TLLI and OLD_TLLI" |
| 152 | #warning "Refactor the below lines... into a new method" |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 153 | ms = bts->bts->ms_store().get_ms(tlli, tlli_old, imsi); |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 154 | if (ms) { |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 155 | ul_tbf = ms->ul_tbf(); |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 156 | ta = ms->ta(); |
| 157 | } |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 158 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 159 | if (ul_tbf && ul_tbf->m_contention_resolution_done |
| 160 | && !ul_tbf->m_final_ack_sent) { |
| 161 | use_trx = ul_tbf->trx->trx_no; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 162 | ss = 0; |
| 163 | old_ul_tbf = ul_tbf; |
| 164 | } else { |
| 165 | use_trx = -1; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 166 | ss = 1; /* PCH assignment only allows one timeslot */ |
| 167 | old_ul_tbf = NULL; |
| 168 | } |
| 169 | |
| 170 | // Create new TBF (any TRX) |
| 171 | #warning "Copy and paste with alloc_ul_tbf" |
| 172 | tfi = bts->bts->tfi_find_free(GPRS_RLCMAC_DL_TBF, &trx, use_trx); |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 173 | if (tfi >= 0) |
| 174 | /* set number of downlink slots according to multislot class */ |
| 175 | dl_tbf = tbf_alloc_dl_tbf(bts, ul_tbf, tfi, trx, ms_class, ss); |
| 176 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 177 | if (!dl_tbf) { |
| 178 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 179 | return -EBUSY; |
| 180 | } |
Jacob Erlbeck | be0cbc1 | 2015-05-18 14:35:11 +0200 | [diff] [blame] | 181 | dl_tbf->update_ms(tlli, GPRS_RLCMAC_DL_TBF); |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 182 | dl_tbf->ms()->set_ta(ta); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 183 | |
| 184 | LOGP(DRLCMAC, LOGL_DEBUG, "%s [DOWNLINK] START\n", tbf_name(dl_tbf)); |
| 185 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 186 | /* Store IMSI for later look-up and PCH retransmission */ |
| 187 | dl_tbf->assign_imsi(imsi); |
| 188 | |
| 189 | /* trigger downlink assignment and set state to ASSIGN. |
| 190 | * we don't use old_downlink, so the possible uplink is used |
| 191 | * to trigger downlink assignment. if there is no uplink, |
| 192 | * AGCH is used. */ |
Jacob Erlbeck | 71e5511 | 2015-05-21 11:10:15 +0200 | [diff] [blame] | 193 | dl_tbf->bts->trigger_dl_ass(dl_tbf, old_ul_tbf); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 194 | *tbf = dl_tbf; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * TODO: split into unit test-able parts... |
| 200 | */ |
| 201 | int gprs_rlcmac_dl_tbf::handle(struct gprs_rlcmac_bts *bts, |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 202 | const uint32_t tlli, const uint32_t tlli_old, const char *imsi, |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 203 | const uint8_t ms_class, const uint16_t delay_csec, |
| 204 | const uint8_t *data, const uint16_t len) |
| 205 | { |
| 206 | struct gprs_rlcmac_dl_tbf *dl_tbf; |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 207 | int rc; |
| 208 | GprsMs *ms; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 209 | |
| 210 | /* check for existing TBF */ |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 211 | dl_tbf = tbf_lookup_dl(bts->bts, tlli, tlli_old, imsi); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 212 | if (!dl_tbf) { |
| 213 | rc = tbf_new_dl_assignment(bts, imsi, tlli, tlli_old, ms_class, |
| 214 | &dl_tbf); |
| 215 | if (rc < 0) |
| 216 | return rc; |
| 217 | } |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 218 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 219 | OSMO_ASSERT(dl_tbf->ms() != NULL); |
| 220 | ms = dl_tbf->ms(); |
| 221 | GprsMs::Guard guard(ms); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 222 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 223 | rc = dl_tbf->append_data(ms_class, delay_csec, data, len); |
| 224 | |
| 225 | dl_tbf = ms->dl_tbf(); |
| 226 | |
| 227 | dl_tbf->assign_imsi(imsi); |
| 228 | ms->confirm_tlli(tlli); |
| 229 | |
| 230 | return rc; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 231 | } |
| 232 | |
| 233 | struct msgb *gprs_rlcmac_dl_tbf::llc_dequeue(bssgp_bvc_ctx *bctx) |
| 234 | { |
| 235 | struct msgb *msg; |
Jacob Erlbeck | 6e4ccec | 2015-05-06 14:24:36 +0200 | [diff] [blame] | 236 | struct timeval tv_now, tv_now2; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 237 | uint32_t octets = 0, frames = 0; |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 238 | struct timeval hyst_delta = {0, 0}; |
| 239 | const unsigned keep_small_thresh = 60; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 240 | const gprs_llc_queue::MetaInfo *info; |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 241 | |
| 242 | if (bts_data()->llc_discard_csec) |
| 243 | csecs_to_timeval(bts_data()->llc_discard_csec, &hyst_delta); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 244 | |
| 245 | gettimeofday(&tv_now, NULL); |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 246 | timeradd(&tv_now, &hyst_delta, &tv_now2); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 247 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 248 | while ((msg = llc_queue()->dequeue(&info))) { |
| 249 | const struct timeval *tv_disc = &info->expire_time; |
| 250 | const struct timeval *tv_recv = &info->recv_time; |
Jacob Erlbeck | 6e4ccec | 2015-05-06 14:24:36 +0200 | [diff] [blame] | 251 | |
| 252 | gprs_bssgp_update_queue_delay(tv_recv, &tv_now); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 253 | |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 254 | /* Is the age below the low water mark? */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 255 | if (!gprs_llc_queue::is_frame_expired(&tv_now2, tv_disc)) |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 256 | break; |
| 257 | |
| 258 | /* Is the age below the high water mark */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 259 | if (!gprs_llc_queue::is_frame_expired(&tv_now, tv_disc)) { |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 260 | /* Has the previous message not been dropped? */ |
| 261 | if (frames == 0) |
| 262 | break; |
| 263 | |
| 264 | /* Hysteresis mode, try to discard LLC messages until |
| 265 | * the low water mark has been reached */ |
| 266 | |
| 267 | /* Check whether to abort the hysteresis mode */ |
| 268 | |
| 269 | /* Is the frame small, perhaps only a TCP ACK? */ |
| 270 | if (msg->len <= keep_small_thresh) |
| 271 | break; |
| 272 | |
| 273 | /* Is it a GMM message? */ |
| 274 | if (!gprs_llc::is_user_data_frame(msg->data, msg->len)) |
| 275 | break; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 276 | } |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 277 | |
| 278 | bts->llc_timedout_frame(); |
| 279 | frames++; |
| 280 | octets += msg->len; |
| 281 | msgb_free(msg); |
Jacob Erlbeck | 29d91e9 | 2015-04-29 14:46:52 +0200 | [diff] [blame] | 282 | bts->llc_dropped_frame(); |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 283 | continue; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 284 | } |
| 285 | |
| 286 | if (frames) { |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 287 | LOGP(DRLCMACDL, LOGL_NOTICE, "%s Discarding LLC PDU " |
| 288 | "because lifetime limit reached, " |
| 289 | "count=%u new_queue_size=%zu\n", |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 290 | tbf_name(this), frames, llc_queue()->size()); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 291 | if (frames > 0xff) |
| 292 | frames = 0xff; |
| 293 | if (octets > 0xffffff) |
| 294 | octets = 0xffffff; |
Jacob Erlbeck | 767193e | 2015-05-20 12:06:46 +0200 | [diff] [blame] | 295 | bssgp_tx_llc_discarded(bctx, tlli(), frames, octets); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 296 | } |
| 297 | |
| 298 | return msg; |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * Create DL data block |
| 303 | * The messages are fragmented and forwarded as data blocks. |
| 304 | */ |
| 305 | struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block(uint32_t fn, uint8_t ts) |
| 306 | { |
| 307 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink (V(A)==%d .. " |
| 308 | "V(S)==%d)\n", tbf_name(this), |
| 309 | m_window.v_a(), m_window.v_s()); |
| 310 | |
| 311 | do_resend: |
| 312 | /* check if there is a block with negative acknowledgement */ |
| 313 | int resend_bsn = m_window.resend_needed(); |
| 314 | if (resend_bsn >= 0) { |
| 315 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", resend_bsn); |
| 316 | /* re-send block with negative aknowlegement */ |
| 317 | m_window.m_v_b.mark_unacked(resend_bsn); |
| 318 | bts->rlc_resent(); |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 319 | return create_dl_acked_block(fn, ts, resend_bsn); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | /* if the window has stalled, or transfer is complete, |
| 323 | * send an unacknowledged block */ |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 324 | if (state_is(GPRS_RLCMAC_FINISHED)) { |
| 325 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 326 | "because all blocks have been transmitted.\n", |
| 327 | m_window.v_a()); |
| 328 | bts->rlc_restarted(); |
| 329 | } else if (dl_window_stalled()) { |
| 330 | LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
| 331 | "because all window is stalled.\n", |
| 332 | m_window.v_a()); |
| 333 | bts->rlc_stalled(); |
Jacob Erlbeck | e25b5b9 | 2015-03-19 14:21:33 +0100 | [diff] [blame] | 334 | } else if (have_data()) { |
| 335 | /* New blocks may be send */ |
| 336 | return create_new_bsn(fn, ts); |
| 337 | } else if (!m_window.window_empty()) { |
| 338 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 339 | "because all blocks have been transmitted (FLOW).\n", |
| 340 | m_window.v_a()); |
| 341 | bts->rlc_restarted(); |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 342 | } else { |
Jacob Erlbeck | e25b5b9 | 2015-03-19 14:21:33 +0100 | [diff] [blame] | 343 | /* Nothing left to send, create dummy LLC commands */ |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 344 | return create_new_bsn(fn, ts); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 345 | } |
| 346 | |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 347 | /* If V(S) == V(A) and finished state, we would have received |
| 348 | * acknowledgement of all transmitted block. In this case we |
| 349 | * would have transmitted the final block, and received ack |
| 350 | * from MS. But in this case we did not receive the final ack |
| 351 | * indication from MS. This should never happen if MS works |
| 352 | * correctly. */ |
| 353 | if (m_window.window_empty()) { |
| 354 | LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks, " |
| 355 | "so we re-transmit final block!\n"); |
| 356 | /* we just send final block again */ |
| 357 | int16_t index = m_window.v_s_mod(-1); |
| 358 | bts->rlc_resent(); |
| 359 | return create_dl_acked_block(fn, ts, index); |
| 360 | } |
| 361 | |
| 362 | /* cycle through all unacked blocks */ |
| 363 | int resend = m_window.mark_for_resend(); |
| 364 | |
| 365 | /* At this point there should be at least one unacked block |
| 366 | * to be resent. If not, this is an software error. */ |
| 367 | if (resend == 0) { |
| 368 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 369 | "There are no unacknowledged blocks, but V(A) " |
| 370 | " != V(S). PLEASE FIX!\n"); |
| 371 | /* we just send final block again */ |
| 372 | int16_t index = m_window.v_s_mod(-1); |
| 373 | return create_dl_acked_block(fn, ts, index); |
| 374 | } |
| 375 | goto do_resend; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 376 | } |
| 377 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 378 | void gprs_rlcmac_dl_tbf::schedule_next_frame() |
| 379 | { |
| 380 | struct msgb *msg; |
| 381 | |
| 382 | if (m_llc.frame_length() != 0) |
| 383 | return; |
| 384 | |
| 385 | /* dequeue next LLC frame, if any */ |
| 386 | msg = llc_dequeue(gprs_bssgp_pcu_current_bctx()); |
| 387 | if (!msg) |
| 388 | return; |
| 389 | |
| 390 | LOGP(DRLCMACDL, LOGL_INFO, |
| 391 | "- Dequeue next LLC for %s (len=%d)\n", |
| 392 | tbf_name(this), msg->len); |
| 393 | |
| 394 | m_llc.put_frame(msg->data, msg->len); |
| 395 | bts->llc_frame_sched(); |
| 396 | msgb_free(msg); |
| 397 | m_last_dl_drained_fn = -1; |
| 398 | } |
| 399 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 400 | struct msgb *gprs_rlcmac_dl_tbf::create_new_bsn(const uint32_t fn, const uint8_t ts) |
| 401 | { |
| 402 | struct rlc_dl_header *rh; |
| 403 | struct rlc_li_field *li; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 404 | uint8_t *delimiter, *data, *e_pointer; |
| 405 | uint16_t space, chunk; |
| 406 | gprs_rlc_data *rlc_data; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 407 | const uint16_t bsn = m_window.v_s(); |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 408 | uint8_t cs = 1; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 409 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 410 | if (m_llc.frame_length() == 0) |
| 411 | schedule_next_frame(); |
| 412 | |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 413 | cs = current_cs(); |
| 414 | |
Jacob Erlbeck | e1d2b35 | 2015-06-12 10:48:05 +0200 | [diff] [blame] | 415 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d, CS=%d\n", |
| 416 | m_window.v_s(), cs); |
| 417 | |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 418 | OSMO_ASSERT(cs >= 1); |
| 419 | OSMO_ASSERT(cs <= 4); |
| 420 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 421 | /* total length of block, including spare bits */ |
| 422 | const uint8_t block_length = gprs_rlcmac_cs[cs].block_length; |
| 423 | /* length of usable data of block, w/o spare bits, inc. MAC */ |
| 424 | const uint8_t block_data_len = gprs_rlcmac_cs[cs].block_data; |
| 425 | |
| 426 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 427 | rlc_data = m_rlc.block(bsn); |
| 428 | data = rlc_data->prepare(block_data_len); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 429 | rlc_data->cs = cs; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 430 | |
| 431 | rh = (struct rlc_dl_header *)data; |
| 432 | rh->pt = 0; /* Data Block */ |
| 433 | rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */ |
| 434 | rh->usf = 7; /* will be set at scheduler */ |
| 435 | rh->pr = 0; /* FIXME: power reduction */ |
| 436 | rh->tfi = m_tfi; /* TFI */ |
| 437 | rh->fbi = 0; /* Final Block Indicator, set late, if true */ |
| 438 | rh->bsn = bsn; /* Block Sequence Number */ |
| 439 | rh->e = 0; /* Extension bit, maybe set later */ |
| 440 | e_pointer = data + 2; /* points to E of current chunk */ |
| 441 | data += sizeof(*rh); |
| 442 | delimiter = data; /* where next length header would be stored */ |
| 443 | space = block_data_len - sizeof(*rh); |
| 444 | while (1) { |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 445 | if (m_llc.frame_length() == 0) { |
| 446 | /* A header will need to by added, so we just need |
| 447 | * space-1 octets */ |
| 448 | m_llc.put_dummy_frame(space - 1); |
| 449 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 450 | /* The data just drained, store the current fn */ |
| 451 | if (m_last_dl_drained_fn < 0) |
| 452 | m_last_dl_drained_fn = fn; |
| 453 | |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 454 | /* It is not clear, when the next real data will |
| 455 | * arrive, so request a DL ack/nack now */ |
| 456 | request_dl_ack(); |
| 457 | |
| 458 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 459 | "-- Empty chunk, " |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 460 | "added LLC dummy command of size %d, " |
| 461 | "drained_since=%d\n", |
| 462 | m_llc.frame_length(), frames_since_last_drain(fn)); |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 463 | } |
| 464 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 465 | chunk = m_llc.chunk_size(); |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 466 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 467 | /* if chunk will exceed block limit */ |
| 468 | if (chunk > space) { |
| 469 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 470 | "larger than space (%d) left in block: copy " |
| 471 | "only remaining space, and we are done\n", |
| 472 | chunk, space); |
| 473 | /* block is filled, so there is no extension */ |
| 474 | *e_pointer |= 0x01; |
| 475 | /* fill only space */ |
| 476 | m_llc.consume(data, space); |
| 477 | /* return data block as message */ |
| 478 | break; |
| 479 | } |
| 480 | /* if FINAL chunk would fit precisely in space left */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 481 | if (chunk == space && llc_queue()->size() == 0 && !keep_open(fn)) |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 482 | { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 483 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 484 | "would exactly fit into space (%d): because " |
| 485 | "this is a final block, we don't add length " |
| 486 | "header, and we are done\n", chunk, space); |
| 487 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for " |
| 488 | "%s that fits precisely in last block: " |
| 489 | "len=%d\n", tbf_name(this), m_llc.frame_length()); |
| 490 | gprs_rlcmac_dl_bw(this, m_llc.frame_length()); |
| 491 | /* block is filled, so there is no extension */ |
| 492 | *e_pointer |= 0x01; |
| 493 | /* fill space */ |
| 494 | m_llc.consume(data, space); |
| 495 | m_llc.reset(); |
| 496 | /* final block */ |
| 497 | rh->fbi = 1; /* we indicate final block */ |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 498 | request_dl_ack(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 499 | set_state(GPRS_RLCMAC_FINISHED); |
| 500 | /* return data block as message */ |
| 501 | break; |
| 502 | } |
| 503 | /* if chunk would fit exactly in space left */ |
| 504 | if (chunk == space) { |
| 505 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d " |
| 506 | "would exactly fit into space (%d): add length " |
| 507 | "header with LI=0, to make frame extend to " |
| 508 | "next block, and we are done\n", chunk, space); |
| 509 | /* make space for delimiter */ |
| 510 | if (delimiter != data) |
| 511 | memmove(delimiter + 1, delimiter, |
| 512 | data - delimiter); |
| 513 | data++; |
| 514 | space--; |
| 515 | /* add LI with 0 length */ |
| 516 | li = (struct rlc_li_field *)delimiter; |
| 517 | li->e = 1; /* not more extension */ |
| 518 | li->m = 0; /* shall be set to 0, in case of li = 0 */ |
| 519 | li->li = 0; /* chunk fills the complete space */ |
| 520 | // no need to set e_pointer nor increase delimiter |
| 521 | /* fill only space, which is 1 octet less than chunk */ |
| 522 | m_llc.consume(data, space); |
| 523 | /* return data block as message */ |
| 524 | break; |
| 525 | } |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 526 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 527 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less " |
| 528 | "than remaining space (%d): add length header to " |
| 529 | "to delimit LLC frame\n", chunk, space); |
| 530 | /* the LLC frame chunk ends in this block */ |
| 531 | /* make space for delimiter */ |
| 532 | if (delimiter != data) |
| 533 | memmove(delimiter + 1, delimiter, data - delimiter); |
| 534 | data++; |
| 535 | space--; |
| 536 | /* add LI to delimit frame */ |
| 537 | li = (struct rlc_li_field *)delimiter; |
| 538 | li->e = 0; /* Extension bit, maybe set later */ |
| 539 | li->m = 0; /* will be set later, if there is more LLC data */ |
| 540 | li->li = chunk; /* length of chunk */ |
| 541 | e_pointer = delimiter; /* points to E of current delimiter */ |
| 542 | delimiter++; |
| 543 | /* copy (rest of) LLC frame to space and reset later */ |
| 544 | m_llc.consume(data, chunk); |
| 545 | data += chunk; |
| 546 | space -= chunk; |
| 547 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for %s" |
| 548 | "len=%d\n", tbf_name(this), m_llc.frame_length()); |
| 549 | gprs_rlcmac_dl_bw(this, m_llc.frame_length()); |
| 550 | m_llc.reset(); |
| 551 | /* dequeue next LLC frame, if any */ |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 552 | schedule_next_frame(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 553 | /* if we have more data and we have space left */ |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 554 | if (space > 0 && (m_llc.frame_length() || keep_open(fn))) { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 555 | li->m = 1; /* we indicate more frames to follow */ |
| 556 | continue; |
| 557 | } |
| 558 | /* if we don't have more LLC frames */ |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 559 | if (!m_llc.frame_length() && !keep_open(fn)) { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 560 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we " |
| 561 | "done.\n"); |
| 562 | li->e = 1; /* we cannot extend */ |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 563 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 564 | rh->fbi = 1; /* we indicate final block */ |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 565 | request_dl_ack(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 566 | set_state(GPRS_RLCMAC_FINISHED); |
| 567 | break; |
| 568 | } |
| 569 | /* we have no space left */ |
| 570 | LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are " |
| 571 | "done.\n"); |
| 572 | li->e = 1; /* we cannot extend */ |
| 573 | break; |
| 574 | } |
| 575 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n", |
| 576 | osmo_hexdump(rlc_data->block, block_length)); |
| 577 | #warning "move this up?" |
| 578 | rlc_data->len = block_length; |
| 579 | /* raise send state and set ack state array */ |
| 580 | m_window.m_v_b.mark_unacked(bsn); |
| 581 | m_window.increment_send(); |
| 582 | |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 583 | return create_dl_acked_block(fn, ts, bsn); |
| 584 | } |
| 585 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 586 | struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block( |
| 587 | const uint32_t fn, const uint8_t ts, |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 588 | const int index) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 589 | { |
| 590 | uint8_t *data; |
| 591 | struct rlc_dl_header *rh; |
| 592 | struct msgb *dl_msg; |
| 593 | uint8_t len; |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 594 | bool need_poll; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 595 | |
| 596 | /* get data and header from current block */ |
| 597 | data = m_rlc.block(index)->block; |
| 598 | len = m_rlc.block(index)->len; |
| 599 | rh = (struct rlc_dl_header *)data; |
| 600 | |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 601 | /* If the TBF has just started, relate frames_since_last_poll to the |
| 602 | * current fn */ |
| 603 | if (m_last_dl_poll_fn < 0) |
| 604 | m_last_dl_poll_fn = fn; |
| 605 | |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 606 | need_poll = state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 607 | /* Clear Polling, if still set in history buffer */ |
| 608 | rh->s_p = 0; |
| 609 | |
| 610 | /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| 611 | */ |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 612 | if (m_tx_counter >= POLL_ACK_AFTER_FRAMES || m_dl_ack_requested || |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 613 | need_poll) { |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 614 | if (m_dl_ack_requested) { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 615 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 616 | "polling, because is was requested explicitly " |
| 617 | "(e.g. first final block sent).\n"); |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 618 | } else if (need_poll) { |
| 619 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Daniel Willmann | 635d47c | 2014-09-17 17:58:29 +0200 | [diff] [blame] | 620 | "polling, because polling timed out.\n"); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 621 | } else { |
| 622 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 623 | "polling, because %d blocks sent.\n", |
| 624 | POLL_ACK_AFTER_FRAMES); |
| 625 | } |
| 626 | /* scheduling not possible, because: */ |
| 627 | if (poll_state != GPRS_RLCMAC_POLL_NONE) |
| 628 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling is already " |
| 629 | "sheduled for %s, so we must wait for " |
| 630 | "requesting downlink ack\n", tbf_name(this)); |
| 631 | else if (control_ts != ts) |
| 632 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling cannot be " |
| 633 | "sheduled in this TS %d, waiting for " |
| 634 | "TS %d\n", ts, control_ts); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 635 | else if (bts->sba()->find(trx->trx_no, ts, (fn + 13) % 2715648)) |
| 636 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling cannot be " |
| 637 | "sheduled, because single block alllocation " |
| 638 | "already exists\n"); |
| 639 | else { |
| 640 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling sheduled in this " |
| 641 | "TS %d\n", ts); |
| 642 | m_tx_counter = 0; |
| 643 | /* start timer whenever we send the final block */ |
| 644 | if (rh->fbi == 1) |
| 645 | tbf_timer_start(this, 3191, bts_data()->t3191, 0); |
| 646 | |
| 647 | /* schedule polling */ |
| 648 | poll_state = GPRS_RLCMAC_POLL_SCHED; |
| 649 | poll_fn = (fn + 13) % 2715648; |
| 650 | |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 651 | /* Clear poll timeout flag */ |
| 652 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 653 | |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 654 | /* Clear request flag */ |
| 655 | m_dl_ack_requested = false; |
| 656 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 657 | /* set polling in header */ |
| 658 | rh->rrbp = 0; /* N+13 */ |
| 659 | rh->s_p = 1; /* Polling */ |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 660 | |
| 661 | m_last_dl_poll_fn = poll_fn; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 662 | } |
| 663 | } |
| 664 | |
| 665 | /* return data block as message */ |
| 666 | dl_msg = msgb_alloc(len, "rlcmac_dl_data"); |
| 667 | if (!dl_msg) |
| 668 | return NULL; |
| 669 | |
| 670 | /* Increment TX-counter */ |
| 671 | m_tx_counter++; |
| 672 | |
| 673 | memcpy(msgb_put(dl_msg, len), data, len); |
| 674 | bts->rlc_sent(); |
| 675 | |
| 676 | return dl_msg; |
| 677 | } |
| 678 | |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 679 | static uint16_t bitnum_to_bsn(int bitnum, uint16_t ssn, uint16_t mod_sns) |
| 680 | { |
| 681 | return (ssn - 1 - bitnum) & mod_sns; |
| 682 | } |
| 683 | |
| 684 | int gprs_rlcmac_dl_tbf::analyse_errors(char *show_rbb, uint8_t ssn) |
| 685 | { |
| 686 | gprs_rlc_data *rlc_data; |
| 687 | uint16_t lost = 0, received = 0, skipped = 0; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 688 | char info[65]; |
| 689 | memset(info, '.', sizeof(info)); |
| 690 | info[64] = 0; |
| 691 | uint16_t bsn = 0; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 692 | |
| 693 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
| 694 | for (int bitpos = 0; bitpos < m_window.ws(); bitpos++) { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 695 | bsn = bitnum_to_bsn(bitpos, ssn, m_window.mod_sns()); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 696 | |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 697 | if (bsn == ((m_window.v_a() - 1) & m_window.mod_sns())) { |
| 698 | info[bitpos] = '$'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 699 | break; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 700 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 701 | |
| 702 | rlc_data = m_rlc.block(bsn); |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 703 | if (!rlc_data) { |
| 704 | info[bitpos] = '0'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 705 | continue; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 706 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 707 | |
| 708 | if (rlc_data->cs != current_cs()) { |
| 709 | /* This block has already been encoded with a different |
| 710 | * CS, so it doesn't help us to decide, whether the |
| 711 | * current CS is ok. Ignore it. */ |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 712 | info[bitpos] = 'x'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 713 | skipped += 1; |
| 714 | continue; |
| 715 | } |
| 716 | |
| 717 | if (show_rbb[m_window.ws() - 1 - bitpos] == 'R') { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 718 | if (!m_window.m_v_b.is_acked(bsn)) { |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 719 | received += 1; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 720 | info[bitpos] = 'R'; |
| 721 | } else { |
| 722 | info[bitpos] = 'r'; |
| 723 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 724 | } else { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 725 | info[bitpos] = 'L'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 726 | lost += 1; |
| 727 | } |
| 728 | } |
| 729 | |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 730 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s DL analysis, range=%d:%d, lost=%d, recv=%d, " |
| 731 | "skipped=%d, bsn=%d, info='%s'\n", |
| 732 | name(), m_window.v_a(), m_window.v_s(), lost, received, |
| 733 | skipped, bsn, info); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 734 | |
Jacob Erlbeck | 144a1d0 | 2015-06-04 16:51:44 +0200 | [diff] [blame] | 735 | if (lost + received <= 1) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 736 | return -1; |
| 737 | |
| 738 | return lost * 100 / (lost + received); |
| 739 | } |
| 740 | |
| 741 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 742 | int gprs_rlcmac_dl_tbf::update_window(const uint8_t ssn, const uint8_t *rbb) |
| 743 | { |
| 744 | int16_t dist; /* must be signed */ |
| 745 | uint16_t lost = 0, received = 0; |
| 746 | char show_rbb[65]; |
| 747 | char show_v_b[RLC_MAX_SNS + 1]; |
| 748 | const uint16_t mod_sns = m_window.mod_sns(); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 749 | int error_rate; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 750 | |
| 751 | Decoding::extract_rbb(rbb, show_rbb); |
| 752 | /* show received array in debug (bit 64..1) */ |
| 753 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
| 754 | "(BSN=%d) R=ACK I=NACK\n", (ssn - 64) & mod_sns, |
| 755 | show_rbb, (ssn - 1) & mod_sns); |
| 756 | |
| 757 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 758 | /* calculate distance of ssn from V(S) */ |
| 759 | dist = (m_window.v_s() - ssn) & mod_sns; |
| 760 | /* check if distance is less than distance V(A)..V(S) */ |
| 761 | if (dist >= m_window.distance()) { |
| 762 | /* this might happpen, if the downlink assignment |
| 763 | * was not received by ms and the ack refers |
| 764 | * to previous TBF |
| 765 | * FIXME: we should implement polling for |
| 766 | * control ack!*/ |
| 767 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 768 | "V(A)..V(S) range %s Free TBF!\n", tbf_name(this)); |
| 769 | return 1; /* indicate to free TBF */ |
| 770 | } |
| 771 | |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 772 | if (bts_data()->cs_adj_enabled && ms()) { |
| 773 | error_rate = analyse_errors(show_rbb, ssn); |
| 774 | ms()->update_error_rate(this, error_rate); |
| 775 | } |
| 776 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 777 | m_window.update(bts, show_rbb, ssn, |
| 778 | &lost, &received); |
| 779 | |
| 780 | /* report lost and received packets */ |
| 781 | gprs_rlcmac_received_lost(this, received, lost); |
| 782 | |
| 783 | /* raise V(A), if possible */ |
| 784 | m_window.raise(m_window.move_window()); |
| 785 | |
| 786 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 787 | m_window.show_state(show_v_b); |
| 788 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 789 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 790 | "X=Resend-Unacked I=Invalid\n", |
| 791 | m_window.v_a(), show_v_b, |
| 792 | m_window.v_s_mod(-1)); |
| 793 | |
| 794 | if (state_is(GPRS_RLCMAC_FINISHED) && m_window.window_empty()) { |
| 795 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 796 | "all blocks, but without final ack " |
| 797 | "inidcation (don't worry)\n"); |
| 798 | } |
| 799 | return 0; |
| 800 | } |
| 801 | |
| 802 | |
| 803 | int gprs_rlcmac_dl_tbf::maybe_start_new_window() |
| 804 | { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 805 | uint16_t received; |
| 806 | |
| 807 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 808 | /* range V(A)..V(S)-1 */ |
| 809 | received = m_window.count_unacked(); |
| 810 | |
| 811 | /* report all outstanding packets as received */ |
| 812 | gprs_rlcmac_received_lost(this, received, 0); |
| 813 | |
| 814 | set_state(GPRS_RLCMAC_WAIT_RELEASE); |
| 815 | |
| 816 | /* check for LLC PDU in the LLC Queue */ |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 817 | if (!have_data()) { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 818 | /* no message, start T3193, change state to RELEASE */ |
| 819 | LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we release.\n"); |
| 820 | /* start T3193 */ |
| 821 | tbf_timer_start(this, 3193, |
| 822 | bts_data()->t3193_msec / 1000, |
| 823 | (bts_data()->t3193_msec % 1000) * 1000); |
| 824 | |
| 825 | return 0; |
| 826 | } |
| 827 | |
| 828 | /* we have more data so we will re-use this tbf */ |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 829 | reuse_tbf(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 830 | return 0; |
| 831 | } |
| 832 | |
| 833 | int gprs_rlcmac_dl_tbf::rcvd_dl_ack(uint8_t final_ack, uint8_t ssn, uint8_t *rbb) |
| 834 | { |
| 835 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this)); |
| 836 | |
| 837 | if (!final_ack) |
| 838 | return update_window(ssn, rbb); |
| 839 | return maybe_start_new_window(); |
| 840 | } |
| 841 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 842 | void gprs_rlcmac_dl_tbf::reuse_tbf() |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 843 | { |
Daniel Willmann | e481815 | 2014-08-15 16:52:09 +0200 | [diff] [blame] | 844 | uint8_t trx; |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 845 | struct gprs_rlcmac_dl_tbf *new_tbf = NULL; |
Daniel Willmann | e481815 | 2014-08-15 16:52:09 +0200 | [diff] [blame] | 846 | int8_t tfi; /* must be signed */ |
Daniel Willmann | e481815 | 2014-08-15 16:52:09 +0200 | [diff] [blame] | 847 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 848 | bts->tbf_reused(); |
Daniel Willmann | e481815 | 2014-08-15 16:52:09 +0200 | [diff] [blame] | 849 | |
| 850 | tfi = bts->tfi_find_free(GPRS_RLCMAC_DL_TBF, &trx, this->trx->trx_no); |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 851 | if (tfi >= 0) |
| 852 | new_tbf = tbf_alloc_dl_tbf(bts->bts_data(), NULL, tfi, trx, |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 853 | ms_class(), 0); |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 854 | |
Daniel Willmann | e481815 | 2014-08-15 16:52:09 +0200 | [diff] [blame] | 855 | if (!new_tbf) { |
| 856 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
Daniel Willmann | e481815 | 2014-08-15 16:52:09 +0200 | [diff] [blame] | 857 | return; |
| 858 | } |
| 859 | |
Jacob Erlbeck | 4f45979 | 2015-05-18 15:21:36 +0200 | [diff] [blame] | 860 | new_tbf->set_ms(ms()); |
Daniel Willmann | e481815 | 2014-08-15 16:52:09 +0200 | [diff] [blame] | 861 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 862 | /* reset rlc states */ |
| 863 | m_tx_counter = 0; |
| 864 | m_wait_confirm = 0; |
| 865 | m_window.reset(); |
| 866 | |
| 867 | /* keep to flags */ |
| 868 | state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; |
| 869 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
| 870 | |
| 871 | update(); |
| 872 | |
| 873 | LOGP(DRLCMAC, LOGL_DEBUG, "%s Trigger dowlink assignment on PACCH, " |
| 874 | "because another LLC PDU has arrived in between\n", |
| 875 | tbf_name(this)); |
Jacob Erlbeck | 71e5511 | 2015-05-21 11:10:15 +0200 | [diff] [blame] | 876 | bts->trigger_dl_ass(new_tbf, this); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 877 | } |
| 878 | |
| 879 | bool gprs_rlcmac_dl_tbf::dl_window_stalled() const |
| 880 | { |
| 881 | return m_window.window_stalled(); |
| 882 | } |
| 883 | |
Jacob Erlbeck | eceb910 | 2015-03-20 14:41:50 +0100 | [diff] [blame] | 884 | void gprs_rlcmac_dl_tbf::request_dl_ack() |
| 885 | { |
| 886 | m_dl_ack_requested = true; |
| 887 | } |
| 888 | |
| 889 | bool gprs_rlcmac_dl_tbf::need_control_ts() const |
| 890 | { |
| 891 | if (poll_state != GPRS_RLCMAC_POLL_NONE) |
| 892 | return false; |
| 893 | |
| 894 | return state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK) || |
| 895 | m_tx_counter >= POLL_ACK_AFTER_FRAMES || |
| 896 | m_dl_ack_requested; |
| 897 | } |
| 898 | |
| 899 | bool gprs_rlcmac_dl_tbf::have_data() const |
| 900 | { |
Jacob Erlbeck | 489a2b3 | 2015-05-28 19:07:01 +0200 | [diff] [blame] | 901 | return m_llc.chunk_size() > 0 || |
| 902 | (llc_queue() && llc_queue()->size() > 0); |
Jacob Erlbeck | eceb910 | 2015-03-20 14:41:50 +0100 | [diff] [blame] | 903 | } |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 904 | |
| 905 | int gprs_rlcmac_dl_tbf::frames_since_last_poll(unsigned fn) const |
| 906 | { |
| 907 | unsigned wrapped; |
| 908 | if (m_last_dl_poll_fn < 0) |
| 909 | return -1; |
| 910 | |
| 911 | wrapped = (fn + 2715648 - m_last_dl_poll_fn) % 2715648; |
| 912 | if (wrapped < 2715648/2) |
| 913 | return wrapped; |
| 914 | else |
| 915 | return wrapped - 2715648; |
| 916 | } |
| 917 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 918 | int gprs_rlcmac_dl_tbf::frames_since_last_drain(unsigned fn) const |
| 919 | { |
| 920 | unsigned wrapped; |
| 921 | if (m_last_dl_drained_fn < 0) |
| 922 | return -1; |
| 923 | |
| 924 | wrapped = (fn + 2715648 - m_last_dl_drained_fn) % 2715648; |
| 925 | if (wrapped < 2715648/2) |
| 926 | return wrapped; |
| 927 | else |
| 928 | return wrapped - 2715648; |
| 929 | } |
| 930 | |
| 931 | bool gprs_rlcmac_dl_tbf::keep_open(unsigned fn) const |
| 932 | { |
| 933 | int keep_time_frames; |
| 934 | |
| 935 | if (bts_data()->dl_tbf_idle_msec <= 0) |
| 936 | return false; |
| 937 | |
| 938 | keep_time_frames = msecs_to_frames(bts_data()->dl_tbf_idle_msec); |
| 939 | return frames_since_last_drain(fn) <= keep_time_frames; |
| 940 | } |