Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1 | /* Copied from tbf.cpp |
| 2 | * |
| 3 | * Copyright (C) 2012 Ivan Klyuchnikov |
| 4 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 5 | * Copyright (C) 2013 by Holger Hans Peter Freyther |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version 2 |
| 10 | * of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 20 | */ |
| 21 | |
| 22 | #include <bts.h> |
| 23 | #include <tbf.h> |
| 24 | #include <rlc.h> |
| 25 | #include <gprs_rlcmac.h> |
| 26 | #include <gprs_debug.h> |
| 27 | #include <gprs_bssgp_pcu.h> |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 28 | #include <gprs_codel.h> |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 29 | #include <decoding.h> |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 30 | #include <encoding.h> |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 31 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 32 | #include "pcu_utils.h" |
| 33 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 34 | extern "C" { |
| 35 | #include <osmocom/core/msgb.h> |
| 36 | #include <osmocom/core/talloc.h> |
Alexander Couzens | 95e3792 | 2016-05-21 22:33:27 +0200 | [diff] [blame] | 37 | #include <osmocom/gprs/gprs_bssgp_bss.h> |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | #include <errno.h> |
| 41 | #include <string.h> |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 42 | #include <math.h> |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 43 | |
| 44 | /* After sending these frames, we poll for ack/nack. */ |
| 45 | #define POLL_ACK_AFTER_FRAMES 20 |
| 46 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 47 | static inline void tbf_update_ms_class(struct gprs_rlcmac_tbf *tbf, |
| 48 | const uint8_t ms_class) |
| 49 | { |
Jacob Erlbeck | befc760 | 2015-06-02 12:33:30 +0200 | [diff] [blame] | 50 | if (!tbf->ms_class() && ms_class) |
| 51 | tbf->set_ms_class(ms_class); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 52 | } |
| 53 | |
Jacob Erlbeck | d0261b7 | 2015-04-02 13:58:09 +0200 | [diff] [blame] | 54 | static void llc_timer_cb(void *_tbf) |
| 55 | { |
| 56 | struct gprs_rlcmac_dl_tbf *tbf = (struct gprs_rlcmac_dl_tbf *)_tbf; |
| 57 | |
| 58 | if (tbf->state_is_not(GPRS_RLCMAC_FLOW)) |
| 59 | return; |
| 60 | |
| 61 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 62 | "%s LLC receive timeout, requesting DL ACK\n", tbf_name(tbf)); |
| 63 | |
| 64 | tbf->request_dl_ack(); |
| 65 | } |
| 66 | |
| 67 | void gprs_rlcmac_dl_tbf::cleanup() |
| 68 | { |
| 69 | osmo_timer_del(&m_llc_timer); |
| 70 | } |
| 71 | |
| 72 | void gprs_rlcmac_dl_tbf::start_llc_timer() |
| 73 | { |
| 74 | if (bts_data()->llc_idle_ack_csec > 0) { |
| 75 | struct timeval tv; |
| 76 | |
| 77 | /* TODO: this ought to be within a constructor */ |
| 78 | m_llc_timer.data = this; |
| 79 | m_llc_timer.cb = &llc_timer_cb; |
| 80 | |
| 81 | csecs_to_timeval(bts_data()->llc_idle_ack_csec, &tv); |
| 82 | osmo_timer_schedule(&m_llc_timer, tv.tv_sec, tv.tv_usec); |
| 83 | } |
| 84 | } |
| 85 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 86 | int gprs_rlcmac_dl_tbf::append_data(const uint8_t ms_class, |
| 87 | const uint16_t pdu_delay_csec, |
| 88 | const uint8_t *data, const uint16_t len) |
| 89 | { |
| 90 | LOGP(DRLCMAC, LOGL_INFO, "%s append\n", tbf_name(this)); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 91 | gprs_llc_queue::MetaInfo info; |
| 92 | struct msgb *llc_msg = msgb_alloc(len, "llc_pdu_queue"); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 93 | if (!llc_msg) |
| 94 | return -ENOMEM; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 95 | |
| 96 | gprs_llc_queue::calc_pdu_lifetime(bts, pdu_delay_csec, &info.expire_time); |
| 97 | gettimeofday(&info.recv_time, NULL); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 98 | memcpy(msgb_put(llc_msg, len), data, len); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 99 | llc_queue()->enqueue(llc_msg, &info); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 100 | tbf_update_ms_class(this, ms_class); |
| 101 | start_llc_timer(); |
| 102 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 103 | if (state_is(GPRS_RLCMAC_WAIT_RELEASE)) { |
| 104 | LOGP(DRLCMAC, LOGL_DEBUG, |
| 105 | "%s in WAIT RELEASE state " |
| 106 | "(T3193), so reuse TBF\n", tbf_name(this)); |
| 107 | tbf_update_ms_class(this, ms_class); |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 108 | establish_dl_tbf_on_pacch(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 109 | } |
| 110 | |
| 111 | return 0; |
| 112 | } |
| 113 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 114 | static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts, |
| 115 | const char *imsi, |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 116 | const uint32_t tlli, const uint32_t tlli_old, |
| 117 | const uint8_t ms_class, |
Jacob Erlbeck | 86b6f05 | 2015-11-27 15:17:34 +0100 | [diff] [blame] | 118 | const uint8_t egprs_ms_class, |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 119 | struct gprs_rlcmac_dl_tbf **tbf) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 120 | { |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 121 | uint8_t ss; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 122 | int8_t use_trx; |
Max | 9bbe160 | 2016-07-18 12:50:18 +0200 | [diff] [blame] | 123 | uint16_t ta = GSM48_TA_INVALID; |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 124 | struct gprs_rlcmac_ul_tbf *ul_tbf = NULL, *old_ul_tbf; |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 125 | struct gprs_rlcmac_dl_tbf *dl_tbf = NULL; |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 126 | GprsMs *ms; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 127 | |
| 128 | /* check for uplink data, so we copy our informations */ |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 129 | ms = bts->bts->ms_store().get_ms(tlli, tlli_old, imsi); |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 130 | if (ms) { |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 131 | ul_tbf = ms->ul_tbf(); |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 132 | ta = ms->ta(); |
| 133 | } |
Jacob Erlbeck | e2e004e | 2015-06-18 17:16:26 +0200 | [diff] [blame] | 134 | /* TODO: if (!ms) create MS before tbf_alloc is called? */ |
Jacob Erlbeck | e43460b | 2015-05-13 13:33:12 +0200 | [diff] [blame] | 135 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 136 | if (ul_tbf && ul_tbf->m_contention_resolution_done |
| 137 | && !ul_tbf->m_final_ack_sent) { |
| 138 | use_trx = ul_tbf->trx->trx_no; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 139 | ss = 0; |
| 140 | old_ul_tbf = ul_tbf; |
| 141 | } else { |
| 142 | use_trx = -1; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 143 | ss = 1; /* PCH assignment only allows one timeslot */ |
| 144 | old_ul_tbf = NULL; |
| 145 | } |
| 146 | |
| 147 | // Create new TBF (any TRX) |
| 148 | #warning "Copy and paste with alloc_ul_tbf" |
Jacob Erlbeck | 5879c64 | 2015-07-10 10:41:36 +0200 | [diff] [blame] | 149 | /* set number of downlink slots according to multislot class */ |
Jacob Erlbeck | 86b6f05 | 2015-11-27 15:17:34 +0100 | [diff] [blame] | 150 | dl_tbf = tbf_alloc_dl_tbf(bts, ms, use_trx, ms_class, egprs_ms_class, ss); |
Jacob Erlbeck | 90de3a7 | 2015-04-09 19:18:59 +0200 | [diff] [blame] | 151 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 152 | if (!dl_tbf) { |
| 153 | LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n"); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 154 | return -EBUSY; |
| 155 | } |
Jacob Erlbeck | be0cbc1 | 2015-05-18 14:35:11 +0200 | [diff] [blame] | 156 | dl_tbf->update_ms(tlli, GPRS_RLCMAC_DL_TBF); |
Jacob Erlbeck | 9200ce6 | 2015-05-22 17:48:04 +0200 | [diff] [blame] | 157 | dl_tbf->ms()->set_ta(ta); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 158 | |
| 159 | LOGP(DRLCMAC, LOGL_DEBUG, "%s [DOWNLINK] START\n", tbf_name(dl_tbf)); |
| 160 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 161 | /* Store IMSI for later look-up and PCH retransmission */ |
| 162 | dl_tbf->assign_imsi(imsi); |
| 163 | |
| 164 | /* trigger downlink assignment and set state to ASSIGN. |
| 165 | * we don't use old_downlink, so the possible uplink is used |
| 166 | * to trigger downlink assignment. if there is no uplink, |
| 167 | * AGCH is used. */ |
Jacob Erlbeck | 71e5511 | 2015-05-21 11:10:15 +0200 | [diff] [blame] | 168 | dl_tbf->bts->trigger_dl_ass(dl_tbf, old_ul_tbf); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 169 | *tbf = dl_tbf; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * TODO: split into unit test-able parts... |
| 175 | */ |
| 176 | int gprs_rlcmac_dl_tbf::handle(struct gprs_rlcmac_bts *bts, |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 177 | const uint32_t tlli, const uint32_t tlli_old, const char *imsi, |
Jacob Erlbeck | f4bb424 | 2016-01-20 13:30:34 +0100 | [diff] [blame] | 178 | uint8_t ms_class, uint8_t egprs_ms_class, |
Jacob Erlbeck | 14e00f8 | 2015-11-27 18:10:39 +0100 | [diff] [blame] | 179 | const uint16_t delay_csec, |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 180 | const uint8_t *data, const uint16_t len) |
| 181 | { |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 182 | struct gprs_rlcmac_dl_tbf *dl_tbf = NULL; |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 183 | int rc; |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 184 | GprsMs *ms, *ms_old; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 185 | |
| 186 | /* check for existing TBF */ |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 187 | ms = bts->bts->ms_store().get_ms(tlli, tlli_old, imsi); |
Jacob Erlbeck | f4bb424 | 2016-01-20 13:30:34 +0100 | [diff] [blame] | 188 | if (ms) { |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 189 | dl_tbf = ms->dl_tbf(); |
| 190 | |
Jacob Erlbeck | f4bb424 | 2016-01-20 13:30:34 +0100 | [diff] [blame] | 191 | /* If we known the GPRS/EGPRS MS class, use it */ |
| 192 | if (ms->ms_class() || ms->egprs_ms_class()) { |
| 193 | ms_class = ms->ms_class(); |
| 194 | egprs_ms_class = ms->egprs_ms_class(); |
| 195 | } |
| 196 | } |
Jacob Erlbeck | a47aaa4 | 2016-01-07 16:47:34 +0100 | [diff] [blame] | 197 | |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 198 | if (ms && strlen(ms->imsi()) == 0) { |
| 199 | ms_old = bts->bts->ms_store().get_ms(0, 0, imsi); |
| 200 | if (ms_old && ms_old != ms) { |
| 201 | /* The TLLI has changed (RAU), so there are two MS |
| 202 | * objects for the same MS */ |
| 203 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 204 | "There is a new MS object for the same MS: " |
| 205 | "(0x%08x, '%s') -> (0x%08x, '%s')\n", |
| 206 | ms_old->tlli(), ms_old->imsi(), |
| 207 | ms->tlli(), ms->imsi()); |
| 208 | |
| 209 | GprsMs::Guard guard_old(ms_old); |
| 210 | |
| 211 | if (!dl_tbf && ms_old->dl_tbf()) { |
| 212 | LOGP(DRLCMAC, LOGL_NOTICE, |
| 213 | "%s IMSI %s: " |
| 214 | "moving DL TBF to new MS object\n", |
Alexander Couzens | 6922bcd | 2016-06-07 14:07:05 +0200 | [diff] [blame] | 215 | ms_old->dl_tbf()->name(), imsi); |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 216 | dl_tbf = ms_old->dl_tbf(); |
| 217 | /* Move the DL TBF to the new MS */ |
| 218 | dl_tbf->set_ms(ms); |
| 219 | } |
| 220 | /* Clean up the old MS object */ |
| 221 | /* TODO: Put this into a separate function, use timer? */ |
| 222 | if (ms_old->ul_tbf() && ms_old->ul_tbf()->T == 0) |
| 223 | tbf_free(ms_old->ul_tbf()); |
| 224 | if (ms_old->dl_tbf() && ms_old->dl_tbf()->T == 0) |
| 225 | tbf_free(ms_old->dl_tbf()); |
| 226 | |
Jacob Erlbeck | 2b349b5 | 2015-08-18 11:55:03 +0200 | [diff] [blame] | 227 | ms->merge_old_ms(ms_old); |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 228 | } |
| 229 | } |
| 230 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 231 | if (!dl_tbf) { |
Jacob Erlbeck | 86b6f05 | 2015-11-27 15:17:34 +0100 | [diff] [blame] | 232 | rc = tbf_new_dl_assignment(bts, imsi, tlli, tlli_old, |
Jacob Erlbeck | 14e00f8 | 2015-11-27 18:10:39 +0100 | [diff] [blame] | 233 | ms_class, egprs_ms_class, &dl_tbf); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 234 | if (rc < 0) |
| 235 | return rc; |
| 236 | } |
Jacob Erlbeck | 9399046 | 2015-05-15 15:50:43 +0200 | [diff] [blame] | 237 | |
Jacob Erlbeck | 14e00f8 | 2015-11-27 18:10:39 +0100 | [diff] [blame] | 238 | /* TODO: ms_class vs. egprs_ms_class is not handled here */ |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 239 | rc = dl_tbf->append_data(ms_class, delay_csec, data, len); |
Jacob Erlbeck | af9a39d | 2015-08-16 21:27:34 +0200 | [diff] [blame] | 240 | dl_tbf->update_ms(tlli, GPRS_RLCMAC_DL_TBF); |
Jacob Erlbeck | ac28905 | 2015-08-14 12:50:54 +0200 | [diff] [blame] | 241 | dl_tbf->assign_imsi(imsi); |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 242 | |
| 243 | return rc; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 244 | } |
| 245 | |
| 246 | struct msgb *gprs_rlcmac_dl_tbf::llc_dequeue(bssgp_bvc_ctx *bctx) |
| 247 | { |
| 248 | struct msgb *msg; |
Jacob Erlbeck | 6e4ccec | 2015-05-06 14:24:36 +0200 | [diff] [blame] | 249 | struct timeval tv_now, tv_now2; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 250 | uint32_t octets = 0, frames = 0; |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 251 | struct timeval hyst_delta = {0, 0}; |
| 252 | const unsigned keep_small_thresh = 60; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 253 | const gprs_llc_queue::MetaInfo *info; |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 254 | |
| 255 | if (bts_data()->llc_discard_csec) |
| 256 | csecs_to_timeval(bts_data()->llc_discard_csec, &hyst_delta); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 257 | |
| 258 | gettimeofday(&tv_now, NULL); |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 259 | timeradd(&tv_now, &hyst_delta, &tv_now2); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 260 | |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 261 | while ((msg = llc_queue()->dequeue(&info))) { |
| 262 | const struct timeval *tv_disc = &info->expire_time; |
| 263 | const struct timeval *tv_recv = &info->recv_time; |
Jacob Erlbeck | 6e4ccec | 2015-05-06 14:24:36 +0200 | [diff] [blame] | 264 | |
| 265 | gprs_bssgp_update_queue_delay(tv_recv, &tv_now); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 266 | |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 267 | if (ms() && ms()->codel_state()) { |
| 268 | int bytes = llc_queue()->octets(); |
| 269 | if (gprs_codel_control(ms()->codel_state(), |
| 270 | tv_recv, &tv_now, bytes)) |
| 271 | goto drop_frame; |
| 272 | } |
| 273 | |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 274 | /* Is the age below the low water mark? */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 275 | if (!gprs_llc_queue::is_frame_expired(&tv_now2, tv_disc)) |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 276 | break; |
| 277 | |
| 278 | /* Is the age below the high water mark */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 279 | if (!gprs_llc_queue::is_frame_expired(&tv_now, tv_disc)) { |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 280 | /* Has the previous message not been dropped? */ |
| 281 | if (frames == 0) |
| 282 | break; |
| 283 | |
| 284 | /* Hysteresis mode, try to discard LLC messages until |
| 285 | * the low water mark has been reached */ |
| 286 | |
| 287 | /* Check whether to abort the hysteresis mode */ |
| 288 | |
| 289 | /* Is the frame small, perhaps only a TCP ACK? */ |
| 290 | if (msg->len <= keep_small_thresh) |
| 291 | break; |
| 292 | |
| 293 | /* Is it a GMM message? */ |
| 294 | if (!gprs_llc::is_user_data_frame(msg->data, msg->len)) |
| 295 | break; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 296 | } |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 297 | |
| 298 | bts->llc_timedout_frame(); |
Jacob Erlbeck | d4ad731 | 2015-07-17 16:39:09 +0200 | [diff] [blame] | 299 | drop_frame: |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 300 | frames++; |
| 301 | octets += msg->len; |
| 302 | msgb_free(msg); |
Jacob Erlbeck | 29d91e9 | 2015-04-29 14:46:52 +0200 | [diff] [blame] | 303 | bts->llc_dropped_frame(); |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 304 | continue; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | if (frames) { |
Jacob Erlbeck | 0c1c877 | 2015-03-20 12:02:42 +0100 | [diff] [blame] | 308 | LOGP(DRLCMACDL, LOGL_NOTICE, "%s Discarding LLC PDU " |
| 309 | "because lifetime limit reached, " |
| 310 | "count=%u new_queue_size=%zu\n", |
Alexander Couzens | d38b92e | 2016-08-21 19:38:30 +0200 | [diff] [blame] | 311 | tbf_name(this), frames, llc_queue_size()); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 312 | if (frames > 0xff) |
| 313 | frames = 0xff; |
| 314 | if (octets > 0xffffff) |
| 315 | octets = 0xffffff; |
Jacob Erlbeck | 6e013a1 | 2015-08-21 15:10:23 +0200 | [diff] [blame] | 316 | if (bctx) |
| 317 | bssgp_tx_llc_discarded(bctx, tlli(), frames, octets); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | return msg; |
| 321 | } |
| 322 | |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 323 | bool gprs_rlcmac_dl_tbf::restart_bsn_cycle() |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 324 | { |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 325 | /* If V(S) == V(A) and finished state, we would have received |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 326 | * acknowledgement of all transmitted block. In this case we would |
| 327 | * have transmitted the final block, and received ack from MS. But in |
| 328 | * this case we did not receive the final ack indication from MS. This |
| 329 | * should never happen if MS works correctly. |
| 330 | */ |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 331 | if (m_window.window_empty()) { |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 332 | LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks\n"); |
| 333 | return false; |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 334 | } |
| 335 | |
| 336 | /* cycle through all unacked blocks */ |
| 337 | int resend = m_window.mark_for_resend(); |
| 338 | |
| 339 | /* At this point there should be at least one unacked block |
| 340 | * to be resent. If not, this is an software error. */ |
| 341 | if (resend == 0) { |
| 342 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 343 | "There are no unacknowledged blocks, but V(A) " |
| 344 | " != V(S). PLEASE FIX!\n"); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 345 | return false; |
Jacob Erlbeck | 9534024 | 2015-03-19 13:22:07 +0100 | [diff] [blame] | 346 | } |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 347 | |
| 348 | return true; |
| 349 | } |
| 350 | |
| 351 | int gprs_rlcmac_dl_tbf::take_next_bsn(uint32_t fn, |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 352 | int previous_bsn, bool *may_combine) |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 353 | { |
| 354 | int bsn; |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 355 | int data_len2, force_data_len = -1; |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 356 | GprsCodingScheme force_cs; |
| 357 | |
| 358 | bsn = m_window.resend_needed(); |
| 359 | |
| 360 | if (previous_bsn >= 0) { |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 361 | force_cs = m_rlc.block(previous_bsn)->cs_current_trans; |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 362 | if (!force_cs.isEgprs()) |
| 363 | return -1; |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 364 | force_data_len = m_rlc.block(previous_bsn)->len; |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 365 | } |
| 366 | |
| 367 | if (bsn >= 0) { |
| 368 | if (previous_bsn == bsn) |
| 369 | return -1; |
| 370 | |
| 371 | if (previous_bsn >= 0 && |
| 372 | m_window.mod_sns(bsn - previous_bsn) > RLC_EGPRS_MAX_BSN_DELTA) |
| 373 | return -1; |
| 374 | |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 375 | if (is_egprs_enabled()) { |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 376 | /* Table 8.1.1.2 and Table 8.1.1.1 of 44.060 */ |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 377 | m_rlc.block(bsn)->cs_current_trans = |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 378 | GprsCodingScheme::get_retx_mcs( |
| 379 | m_rlc.block(bsn)->cs_init, |
| 380 | ms()->current_cs_dl(), |
| 381 | bts->bts_data()->dl_arq_type); |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 382 | |
| 383 | LOGP(DRLCMACDL, LOGL_DEBUG, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 384 | "- initial_cs_dl(%d) last_mcs(%d)" |
| 385 | " demanded_mcs(%d) cs_trans(%d)" |
| 386 | " arq_type(%d) bsn(%d)\n", |
| 387 | m_rlc.block(bsn)->cs_init.to_num(), |
| 388 | m_rlc.block(bsn)->cs_last.to_num(), |
| 389 | ms()->current_cs_dl().to_num(), |
| 390 | m_rlc.block(bsn)->cs_current_trans.to_num(), |
| 391 | bts->bts_data()->dl_arq_type, bsn); |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 392 | |
| 393 | /* TODO: Need to remove this check when MCS-8 -> MCS-6 |
| 394 | * transistion is handled. |
| 395 | * Refer commit be881c028fc4da00c4046ecd9296727975c206a3 |
| 396 | */ |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 397 | if (m_rlc.block(bsn)->cs_init == GprsCodingScheme::MCS8) |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 398 | m_rlc.block(bsn)->cs_current_trans = |
| 399 | GprsCodingScheme::MCS8; |
| 400 | } else |
| 401 | m_rlc.block(bsn)->cs_current_trans = |
| 402 | m_rlc.block(bsn)->cs_last; |
| 403 | |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 404 | data_len2 = m_rlc.block(bsn)->len; |
| 405 | if (force_data_len > 0 && force_data_len != data_len2) |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 406 | return -1; |
| 407 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", bsn); |
| 408 | /* re-send block with negative aknowlegement */ |
| 409 | m_window.m_v_b.mark_unacked(bsn); |
| 410 | bts->rlc_resent(); |
| 411 | } else if (state_is(GPRS_RLCMAC_FINISHED)) { |
| 412 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 413 | "because all blocks have been transmitted.\n", |
| 414 | m_window.v_a()); |
| 415 | bts->rlc_restarted(); |
| 416 | if (restart_bsn_cycle()) |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 417 | return take_next_bsn(fn, previous_bsn, may_combine); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 418 | } else if (dl_window_stalled()) { |
| 419 | LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, " |
| 420 | "because the window is stalled.\n", |
| 421 | m_window.v_a()); |
| 422 | bts->rlc_stalled(); |
| 423 | if (restart_bsn_cycle()) |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 424 | return take_next_bsn(fn, previous_bsn, may_combine); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 425 | } else if (have_data()) { |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 426 | GprsCodingScheme new_cs; |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 427 | /* New blocks may be send */ |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 428 | new_cs = force_cs ? force_cs : current_cs(); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 429 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 430 | "- Sending new block at BSN %d, CS=%s\n", |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 431 | m_window.v_s(), new_cs.name()); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 432 | |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 433 | bsn = create_new_bsn(fn, new_cs); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 434 | } else if (!m_window.window_empty()) { |
| 435 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, " |
| 436 | "because all blocks have been transmitted (FLOW).\n", |
| 437 | m_window.v_a()); |
| 438 | bts->rlc_restarted(); |
| 439 | if (restart_bsn_cycle()) |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 440 | return take_next_bsn(fn, previous_bsn, may_combine); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 441 | } else { |
| 442 | /* Nothing left to send, create dummy LLC commands */ |
| 443 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 444 | "- Sending new dummy block at BSN %d, CS=%s\n", |
| 445 | m_window.v_s(), current_cs().name()); |
| 446 | bsn = create_new_bsn(fn, current_cs()); |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 447 | /* Don't send a second block, so don't set cs_current_trans */ |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | if (bsn < 0) { |
| 451 | /* we just send final block again */ |
| 452 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 453 | "- Nothing else to send, Re-transmit final block!\n"); |
| 454 | bsn = m_window.v_s_mod(-1); |
sivasankari | 168911b | 2016-11-25 19:53:36 +0530 | [diff] [blame] | 455 | bts->rlc_final_block_resent(); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 456 | bts->rlc_resent(); |
| 457 | } |
| 458 | |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 459 | *may_combine = m_rlc.block(bsn)->cs_current_trans.numDataBlocks() > 1; |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 460 | |
| 461 | return bsn; |
| 462 | } |
| 463 | |
| 464 | /* |
| 465 | * Create DL data block |
| 466 | * The messages are fragmented and forwarded as data blocks. |
| 467 | */ |
| 468 | struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block(uint32_t fn, uint8_t ts) |
| 469 | { |
| 470 | int bsn, bsn2 = -1; |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 471 | bool may_combine; |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 472 | |
| 473 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink (V(A)==%d .. " |
| 474 | "V(S)==%d)\n", tbf_name(this), |
| 475 | m_window.v_a(), m_window.v_s()); |
| 476 | |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 477 | bsn = take_next_bsn(fn, -1, &may_combine); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 478 | if (bsn < 0) |
| 479 | return NULL; |
| 480 | |
Jacob Erlbeck | 64e7b83 | 2016-02-04 15:16:47 +0100 | [diff] [blame] | 481 | if (may_combine) |
| 482 | bsn2 = take_next_bsn(fn, bsn, &may_combine); |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 483 | |
| 484 | return create_dl_acked_block(fn, ts, bsn, bsn2); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 485 | } |
| 486 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 487 | void gprs_rlcmac_dl_tbf::schedule_next_frame() |
| 488 | { |
| 489 | struct msgb *msg; |
| 490 | |
| 491 | if (m_llc.frame_length() != 0) |
| 492 | return; |
| 493 | |
| 494 | /* dequeue next LLC frame, if any */ |
| 495 | msg = llc_dequeue(gprs_bssgp_pcu_current_bctx()); |
| 496 | if (!msg) |
| 497 | return; |
| 498 | |
| 499 | LOGP(DRLCMACDL, LOGL_INFO, |
| 500 | "- Dequeue next LLC for %s (len=%d)\n", |
| 501 | tbf_name(this), msg->len); |
| 502 | |
| 503 | m_llc.put_frame(msg->data, msg->len); |
| 504 | bts->llc_frame_sched(); |
| 505 | msgb_free(msg); |
| 506 | m_last_dl_drained_fn = -1; |
| 507 | } |
| 508 | |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 509 | int gprs_rlcmac_dl_tbf::create_new_bsn(const uint32_t fn, GprsCodingScheme cs) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 510 | { |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 511 | uint8_t *data; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 512 | gprs_rlc_data *rlc_data; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 513 | const uint16_t bsn = m_window.v_s(); |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 514 | gprs_rlc_data_block_info *rdbi; |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 515 | int num_chunks = 0; |
| 516 | int write_offset = 0; |
| 517 | Encoding::AppendResult ar; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 518 | |
Jacob Erlbeck | 409efa1 | 2015-06-12 14:06:09 +0200 | [diff] [blame] | 519 | if (m_llc.frame_length() == 0) |
| 520 | schedule_next_frame(); |
| 521 | |
Jacob Erlbeck | cb72890 | 2016-01-05 15:33:03 +0100 | [diff] [blame] | 522 | OSMO_ASSERT(cs.isValid()); |
Jacob Erlbeck | a700dd9 | 2015-06-02 16:00:41 +0200 | [diff] [blame] | 523 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 524 | /* length of usable data block (single data unit w/o header) */ |
| 525 | const uint8_t block_data_len = cs.maxDataBlockBytes(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 526 | |
| 527 | /* now we still have untransmitted LLC data, so we fill mac block */ |
| 528 | rlc_data = m_rlc.block(bsn); |
| 529 | data = rlc_data->prepare(block_data_len); |
Aravind Sirsikar | 9149552 | 2016-07-12 14:17:12 +0530 | [diff] [blame] | 530 | rlc_data->cs_last = cs; |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 531 | rlc_data->cs_current_trans = cs; |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 532 | |
| 533 | /* Initialise the variable related to DL SPB */ |
| 534 | rlc_data->spb_status.block_status_dl = EGPRS_RESEG_DL_DEFAULT; |
| 535 | rlc_data->cs_init = cs; |
| 536 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 537 | rlc_data->len = block_data_len; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 538 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 539 | rdbi = &(rlc_data->block_info); |
| 540 | memset(rdbi, 0, sizeof(*rdbi)); |
| 541 | rdbi->data_len = block_data_len; |
| 542 | |
| 543 | rdbi->cv = 15; /* Final Block Indicator, set late, if true */ |
| 544 | rdbi->bsn = bsn; /* Block Sequence Number */ |
| 545 | rdbi->e = 1; /* Extension bit, maybe set later (1: no extension) */ |
| 546 | |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 547 | do { |
| 548 | bool is_final; |
Alexander Couzens | 7fdbf89 | 2016-05-21 19:45:23 +0200 | [diff] [blame] | 549 | int payload_written = 0; |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 550 | |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 551 | if (m_llc.frame_length() == 0) { |
Alexander Couzens | 1a50661 | 2016-05-24 16:55:30 +0200 | [diff] [blame] | 552 | /* nothing to sent - delay the release of the TBF */ |
| 553 | |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 554 | int space = block_data_len - write_offset; |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 555 | /* A header will need to by added, so we just need |
| 556 | * space-1 octets */ |
| 557 | m_llc.put_dummy_frame(space - 1); |
| 558 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 559 | /* The data just drained, store the current fn */ |
| 560 | if (m_last_dl_drained_fn < 0) |
| 561 | m_last_dl_drained_fn = fn; |
| 562 | |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 563 | /* It is not clear, when the next real data will |
| 564 | * arrive, so request a DL ack/nack now */ |
| 565 | request_dl_ack(); |
| 566 | |
| 567 | LOGP(DRLCMACDL, LOGL_DEBUG, |
| 568 | "-- Empty chunk, " |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 569 | "added LLC dummy command of size %d, " |
| 570 | "drained_since=%d\n", |
| 571 | m_llc.frame_length(), frames_since_last_drain(fn)); |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 572 | } |
| 573 | |
Alexander Couzens | d38b92e | 2016-08-21 19:38:30 +0200 | [diff] [blame] | 574 | is_final = llc_queue_size() == 0 && !keep_open(fn); |
Jacob Erlbeck | cbb1e70 | 2015-03-25 12:21:55 +0100 | [diff] [blame] | 575 | |
Jacob Erlbeck | 5058bd6 | 2016-01-13 10:51:25 +0100 | [diff] [blame] | 576 | ar = Encoding::rlc_data_to_dl_append(rdbi, cs, |
Alexander Couzens | 7fdbf89 | 2016-05-21 19:45:23 +0200 | [diff] [blame] | 577 | &m_llc, &write_offset, &num_chunks, data, is_final, &payload_written); |
| 578 | |
| 579 | if (payload_written > 0) |
| 580 | bts->rlc_dl_payload_bytes(payload_written); |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 581 | |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 582 | if (ar == Encoding::AR_NEED_MORE_BLOCKS) |
| 583 | break; |
| 584 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 585 | LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for %s" |
| 586 | "len=%d\n", tbf_name(this), m_llc.frame_length()); |
| 587 | gprs_rlcmac_dl_bw(this, m_llc.frame_length()); |
Alexander Couzens | 7fdbf89 | 2016-05-21 19:45:23 +0200 | [diff] [blame] | 588 | bts->llc_dl_bytes(m_llc.frame_length()); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 589 | m_llc.reset(); |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 590 | |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 591 | if (is_final) { |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 592 | request_dl_ack(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 593 | set_state(GPRS_RLCMAC_FINISHED); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 594 | } |
Jacob Erlbeck | fec94d1 | 2016-01-12 17:02:49 +0100 | [diff] [blame] | 595 | |
| 596 | /* dequeue next LLC frame, if any */ |
| 597 | schedule_next_frame(); |
| 598 | } while (ar == Encoding::AR_COMPLETED_SPACE_LEFT); |
| 599 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 600 | LOGP(DRLCMACDL, LOGL_DEBUG, "data block (BSN %d, %s): %s\n", |
Aravind Sirsikar | 9149552 | 2016-07-12 14:17:12 +0530 | [diff] [blame] | 601 | bsn, rlc_data->cs_last.name(), |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 602 | osmo_hexdump(rlc_data->block, block_data_len)); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 603 | /* raise send state and set ack state array */ |
| 604 | m_window.m_v_b.mark_unacked(bsn); |
| 605 | m_window.increment_send(); |
| 606 | |
Jacob Erlbeck | d675249 | 2016-02-02 18:12:46 +0100 | [diff] [blame] | 607 | return bsn; |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 608 | } |
| 609 | |
Max | aae1bfb | 2017-07-07 13:49:29 +0200 | [diff] [blame] | 610 | void gprs_rlcmac_dl_tbf::clear_poll_timeout_flag() |
| 611 | { |
| 612 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
| 613 | } |
| 614 | |
| 615 | bool gprs_rlcmac_dl_tbf::handle_ack_nack() |
| 616 | { |
| 617 | bool ack_recovered = false; |
| 618 | |
| 619 | state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK); |
| 620 | if ((state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) { |
| 621 | clear_poll_timeout_flag(); |
| 622 | ack_recovered = true; |
| 623 | } |
| 624 | |
| 625 | /* reset N3105 */ |
| 626 | n3105 = 0; |
| 627 | stop_t3191(); |
| 628 | poll_state = GPRS_RLCMAC_POLL_NONE; |
| 629 | |
| 630 | return ack_recovered; |
| 631 | } |
| 632 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 633 | struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block( |
| 634 | const uint32_t fn, const uint8_t ts, |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 635 | int index, int index2) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 636 | { |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 637 | uint8_t *msg_data; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 638 | struct msgb *dl_msg; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 639 | unsigned msg_len; |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 640 | bool need_poll; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 641 | /* TODO: support MCS-7 - MCS-9, where data_block_idx can be 1 */ |
| 642 | unsigned int data_block_idx = 0; |
Jacob Erlbeck | f2694b7 | 2016-01-26 21:46:26 +0100 | [diff] [blame] | 643 | unsigned int rrbp; |
| 644 | uint32_t new_poll_fn; |
| 645 | int rc; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 646 | bool is_final = false; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 647 | gprs_rlc_data_info rlc; |
| 648 | GprsCodingScheme cs; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 649 | int bsns[ARRAY_SIZE(rlc.block_info)]; |
| 650 | unsigned num_bsns; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 651 | bool need_padding = false; |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 652 | enum egprs_rlcmac_dl_spb spb = EGPRS_RLCMAC_DL_NO_RETX; |
| 653 | unsigned int spb_status = get_egprs_dl_spb_status(index); |
Neels Hofmeyr | b609190 | 2017-02-08 16:49:20 +0100 | [diff] [blame] | 654 | |
| 655 | enum egprs_puncturing_values punct[2] = { |
| 656 | EGPRS_PS_INVALID, EGPRS_PS_INVALID |
| 657 | }; |
| 658 | osmo_static_assert(ARRAY_SIZE(rlc.block_info) == 2, |
| 659 | rlc_block_info_size_is_two); |
| 660 | |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 661 | /* |
| 662 | * TODO: This is an experimental work-around to put 2 BSN into |
| 663 | * MSC-7 to MCS-9 encoded messages. It just sends the same BSN |
| 664 | * twice in the block. The cs should be derived from the TBF's |
| 665 | * current CS such that both BSNs (that must be compatible) can |
| 666 | * be put into the data area, even if the resulting CS is higher than |
| 667 | * the current limit. |
| 668 | */ |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 669 | cs = m_rlc.block(index)->cs_current_trans; |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 670 | GprsCodingScheme &cs_init = m_rlc.block(index)->cs_init; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 671 | bsns[0] = index; |
| 672 | num_bsns = 1; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 673 | |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 674 | if (index2 >= 0) { |
| 675 | bsns[num_bsns] = index2; |
| 676 | num_bsns += 1; |
| 677 | } |
| 678 | |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 679 | update_coding_scheme_counter_dl(cs); |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 680 | /* |
| 681 | * if the intial mcs is 8 and retransmission mcs is either 6 or 3 |
| 682 | * we have to include the padding of 6 octets in first segment |
| 683 | */ |
| 684 | if ((GprsCodingScheme::Scheme(cs_init) == GprsCodingScheme::MCS8) && |
| 685 | (GprsCodingScheme::Scheme(cs) == GprsCodingScheme::MCS6 || |
| 686 | GprsCodingScheme::Scheme(cs) == GprsCodingScheme::MCS3)) { |
| 687 | if (spb_status == EGPRS_RESEG_DL_DEFAULT || |
| 688 | spb_status == EGPRS_RESEG_SECOND_SEG_SENT) |
| 689 | need_padding = true; |
| 690 | } else if (num_bsns == 1) { |
Jacob Erlbeck | be881c0 | 2016-02-03 20:44:46 +0100 | [diff] [blame] | 691 | /* TODO: remove the conditional when MCS-6 padding isn't |
| 692 | * failing to be decoded by MEs anymore */ |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 693 | /* TODO: support of MCS-8 -> MCS-6 transition should be |
| 694 | * handled |
| 695 | * Refer commit be881c028fc4da00c4046ecd9296727975c206a3 |
| 696 | * dated 2016-02-07 23:45:40 (UTC) |
| 697 | */ |
Jacob Erlbeck | be881c0 | 2016-02-03 20:44:46 +0100 | [diff] [blame] | 698 | if (cs != GprsCodingScheme(GprsCodingScheme::MCS8)) |
| 699 | cs.decToSingleBlock(&need_padding); |
| 700 | } |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 701 | |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 702 | spb = get_egprs_dl_spb(index); |
| 703 | |
| 704 | LOGP(DRLCMACDL, LOGL_DEBUG, "- need_padding %d spb_status %d spb %d" |
| 705 | "(BSN1 %d BSN2 %d)\n", |
| 706 | need_padding, |
| 707 | spb_status, spb, index, index2); |
| 708 | |
| 709 | gprs_rlc_data_info_init_dl(&rlc, cs, need_padding, spb); |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 710 | |
| 711 | rlc.usf = 7; /* will be set at scheduler */ |
| 712 | rlc.pr = 0; /* FIXME: power reduction */ |
| 713 | rlc.tfi = m_tfi; /* TFI */ |
| 714 | |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 715 | /* return data block(s) as message */ |
| 716 | msg_len = cs.sizeDL(); |
| 717 | dl_msg = msgb_alloc(msg_len, "rlcmac_dl_data"); |
| 718 | if (!dl_msg) |
| 719 | return NULL; |
| 720 | |
| 721 | msg_data = msgb_put(dl_msg, msg_len); |
| 722 | |
Aravind Sirsikar | b119198 | 2016-08-26 18:13:10 +0530 | [diff] [blame] | 723 | OSMO_ASSERT(rlc.num_data_blocks <= ARRAY_SIZE(rlc.block_info)); |
| 724 | OSMO_ASSERT(rlc.num_data_blocks > 0); |
| 725 | |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 726 | /* Copy block(s) to RLC message */ |
| 727 | for (data_block_idx = 0; data_block_idx < rlc.num_data_blocks; |
| 728 | data_block_idx++) |
| 729 | { |
| 730 | int bsn; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 731 | uint8_t *block_data; |
| 732 | gprs_rlc_data_block_info *rdbi, *block_info; |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 733 | enum egprs_rlc_dl_reseg_bsn_state reseg_status; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 734 | |
| 735 | /* Check if there are more blocks than BSNs */ |
| 736 | if (data_block_idx < num_bsns) |
| 737 | bsn = bsns[data_block_idx]; |
| 738 | else |
| 739 | bsn = bsns[0]; |
| 740 | |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 741 | /* Get current puncturing scheme from block */ |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 742 | |
| 743 | m_rlc.block(bsn)->next_ps = gprs_get_punct_scheme( |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 744 | m_rlc.block(bsn)->next_ps, |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 745 | m_rlc.block(bsn)->cs_last, cs, spb); |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 746 | |
| 747 | if (cs.isEgprs()) { |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 748 | OSMO_ASSERT(m_rlc.block(bsn)->next_ps >= EGPRS_PS_1); |
| 749 | OSMO_ASSERT(m_rlc.block(bsn)->next_ps <= EGPRS_PS_3); |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 750 | } |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 751 | punct[data_block_idx] = m_rlc.block(bsn)->next_ps; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 752 | |
| 753 | rdbi = &rlc.block_info[data_block_idx]; |
| 754 | block_info = &m_rlc.block(bsn)->block_info; |
| 755 | |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 756 | /* |
| 757 | * get data and header from current block |
| 758 | * function returns the reseg status |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 759 | */ |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 760 | reseg_status = egprs_dl_get_data(bsn, &block_data); |
| 761 | m_rlc.block(bsn)->spb_status.block_status_dl = reseg_status; |
| 762 | |
| 763 | /* |
| 764 | * If it is first segment of the split block set the state of |
| 765 | * bsn to nacked. If it is the first segment dont update the |
| 766 | * next ps value of bsn. since next segment also needs same cps |
| 767 | */ |
| 768 | if (spb == EGPRS_RLCMAC_DL_FIRST_SEG) |
| 769 | m_window.m_v_b.mark_nacked(bsn); |
| 770 | else { |
| 771 | /* |
| 772 | * TODO: Need to handle 2 same bsns |
| 773 | * in header type 1 |
| 774 | */ |
| 775 | gprs_update_punct_scheme(&m_rlc.block(bsn)->next_ps, |
| 776 | cs); |
| 777 | } |
Aravind Sirsikar | 7952282 | 2016-03-23 18:29:47 +0530 | [diff] [blame] | 778 | |
Aravind Sirsikar | cf2152b | 2016-07-13 18:46:17 +0530 | [diff] [blame] | 779 | m_rlc.block(bsn)->cs_last = cs; |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 780 | rdbi->e = block_info->e; |
| 781 | rdbi->cv = block_info->cv; |
| 782 | rdbi->bsn = bsn; |
| 783 | is_final = is_final || rdbi->cv == 0; |
| 784 | |
| 785 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Copying data unit %d (BSN %d)\n", |
| 786 | data_block_idx, bsn); |
| 787 | |
| 788 | Encoding::rlc_copy_from_aligned_buffer(&rlc, data_block_idx, |
| 789 | msg_data, block_data); |
| 790 | } |
| 791 | |
Neels Hofmeyr | 49b83ec | 2017-02-08 15:47:19 +0100 | [diff] [blame] | 792 | /* Calculate CPS only for EGPRS case */ |
Neels Hofmeyr | b609190 | 2017-02-08 16:49:20 +0100 | [diff] [blame] | 793 | if (cs.isEgprs()) |
Neels Hofmeyr | 49b83ec | 2017-02-08 15:47:19 +0100 | [diff] [blame] | 794 | rlc.cps = gprs_rlc_mcs_cps(cs, punct[0], punct[1], need_padding); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 795 | |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 796 | /* If the TBF has just started, relate frames_since_last_poll to the |
| 797 | * current fn */ |
| 798 | if (m_last_dl_poll_fn < 0) |
| 799 | m_last_dl_poll_fn = fn; |
| 800 | |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 801 | need_poll = state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 802 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 803 | /* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx. |
| 804 | */ |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 805 | if (m_tx_counter >= POLL_ACK_AFTER_FRAMES || m_dl_ack_requested || |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 806 | need_poll) { |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 807 | if (m_dl_ack_requested) { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 808 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 809 | "polling, because is was requested explicitly " |
| 810 | "(e.g. first final block sent).\n"); |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 811 | } else if (need_poll) { |
| 812 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
Daniel Willmann | 635d47c | 2014-09-17 17:58:29 +0200 | [diff] [blame] | 813 | "polling, because polling timed out.\n"); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 814 | } else { |
| 815 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack " |
| 816 | "polling, because %d blocks sent.\n", |
| 817 | POLL_ACK_AFTER_FRAMES); |
| 818 | } |
Jacob Erlbeck | f2694b7 | 2016-01-26 21:46:26 +0100 | [diff] [blame] | 819 | |
| 820 | rc = check_polling(fn, ts, &new_poll_fn, &rrbp); |
| 821 | if (rc >= 0) { |
| 822 | set_polling(new_poll_fn, ts); |
| 823 | |
| 824 | LOGP(DRLCMACDL, LOGL_DEBUG, "Polling scheduled in this " |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 825 | "TS %d\n", ts); |
| 826 | m_tx_counter = 0; |
| 827 | /* start timer whenever we send the final block */ |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 828 | if (is_final) |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 829 | tbf_timer_start(this, 3191, bts_data()->t3191, 0); |
| 830 | |
Max | aae1bfb | 2017-07-07 13:49:29 +0200 | [diff] [blame] | 831 | clear_poll_timeout_flag(); |
Daniel Willmann | efd5dbb | 2014-08-25 16:20:23 +0200 | [diff] [blame] | 832 | |
Jacob Erlbeck | 7c44415 | 2015-03-12 12:08:54 +0100 | [diff] [blame] | 833 | /* Clear request flag */ |
| 834 | m_dl_ack_requested = false; |
| 835 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 836 | /* set polling in header */ |
Jacob Erlbeck | f2694b7 | 2016-01-26 21:46:26 +0100 | [diff] [blame] | 837 | rlc.rrbp = rrbp; |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 838 | rlc.es_p = 1; /* Polling */ |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 839 | |
| 840 | m_last_dl_poll_fn = poll_fn; |
Jacob Erlbeck | 16d29c7 | 2015-08-24 13:30:39 +0200 | [diff] [blame] | 841 | |
| 842 | LOGP(DRLCMACDL, LOGL_INFO, |
| 843 | "%s Scheduled Ack/Nack polling on FN=%d, TS=%d\n", |
Jacob Erlbeck | 8eb1714 | 2016-01-22 17:58:17 +0100 | [diff] [blame] | 844 | name(), poll_fn, poll_ts); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 845 | } |
| 846 | } |
| 847 | |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 848 | Encoding::rlc_write_dl_data_header(&rlc, msg_data); |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 849 | |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 850 | LOGP(DRLCMACDL, LOGL_DEBUG, "msg block (BSN %d, %s%s): %s\n", |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 851 | index, cs.name(), |
Jacob Erlbeck | be314d9 | 2016-02-02 15:32:10 +0100 | [diff] [blame] | 852 | need_padding ? ", padded" : "", |
Jacob Erlbeck | 3a3b6a7 | 2016-01-11 16:15:45 +0100 | [diff] [blame] | 853 | msgb_hexdump(dl_msg)); |
| 854 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 855 | /* Increment TX-counter */ |
| 856 | m_tx_counter++; |
| 857 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 858 | return dl_msg; |
| 859 | } |
| 860 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 861 | static uint16_t bitnum_to_bsn(int bitnum, uint16_t ssn) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 862 | { |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 863 | return ssn - 1 - bitnum; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 864 | } |
| 865 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 866 | int gprs_rlcmac_dl_tbf::analyse_errors(char *show_rbb, uint8_t ssn, |
| 867 | ana_result *res) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 868 | { |
| 869 | gprs_rlc_data *rlc_data; |
| 870 | uint16_t lost = 0, received = 0, skipped = 0; |
Jacob Erlbeck | b41262f | 2016-02-05 17:13:24 +0100 | [diff] [blame] | 871 | char info[RLC_MAX_WS + 1]; |
| 872 | memset(info, '.', m_window.ws()); |
| 873 | info[m_window.ws()] = 0; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 874 | uint16_t bsn = 0; |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 875 | unsigned received_bytes = 0, lost_bytes = 0; |
| 876 | unsigned received_packets = 0, lost_packets = 0; |
Jacob Erlbeck | b41262f | 2016-02-05 17:13:24 +0100 | [diff] [blame] | 877 | unsigned num_blocks = strlen(show_rbb); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 878 | |
aravind sirsikar | fb41afa | 2016-11-02 15:48:00 +0530 | [diff] [blame] | 879 | unsigned distance = m_window.distance(); |
| 880 | |
| 881 | num_blocks = num_blocks > distance |
| 882 | ? distance : num_blocks; |
| 883 | |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 884 | /* SSN - 1 is in range V(A)..V(S)-1 */ |
Jacob Erlbeck | b41262f | 2016-02-05 17:13:24 +0100 | [diff] [blame] | 885 | for (unsigned int bitpos = 0; bitpos < num_blocks; bitpos++) { |
| 886 | bool is_received; |
| 887 | int index = num_blocks - 1 - bitpos; |
| 888 | |
| 889 | is_received = (index >= 0 && show_rbb[index] == 'R'); |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 890 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 891 | bsn = m_window.mod_sns(bitnum_to_bsn(bitpos, ssn)); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 892 | |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 893 | if (bsn == m_window.mod_sns(m_window.v_a() - 1)) { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 894 | info[bitpos] = '$'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 895 | break; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 896 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 897 | |
| 898 | rlc_data = m_rlc.block(bsn); |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 899 | if (!rlc_data) { |
| 900 | info[bitpos] = '0'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 901 | continue; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 902 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 903 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 904 | /* Get general statistics */ |
| 905 | if (is_received && !m_window.m_v_b.is_acked(bsn)) { |
| 906 | received_packets += 1; |
| 907 | received_bytes += rlc_data->len; |
| 908 | } else if (!is_received && !m_window.m_v_b.is_nacked(bsn)) { |
| 909 | lost_packets += 1; |
| 910 | lost_bytes += rlc_data->len; |
| 911 | } |
| 912 | |
| 913 | /* Get statistics for current CS */ |
| 914 | |
Aravind Sirsikar | 9149552 | 2016-07-12 14:17:12 +0530 | [diff] [blame] | 915 | if (rlc_data->cs_last != current_cs()) { |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 916 | /* This block has already been encoded with a different |
| 917 | * CS, so it doesn't help us to decide, whether the |
| 918 | * current CS is ok. Ignore it. */ |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 919 | info[bitpos] = 'x'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 920 | skipped += 1; |
| 921 | continue; |
| 922 | } |
| 923 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 924 | if (is_received) { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 925 | if (!m_window.m_v_b.is_acked(bsn)) { |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 926 | received += 1; |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 927 | info[bitpos] = 'R'; |
| 928 | } else { |
| 929 | info[bitpos] = 'r'; |
| 930 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 931 | } else { |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 932 | info[bitpos] = 'L'; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 933 | lost += 1; |
| 934 | } |
| 935 | } |
| 936 | |
Jacob Erlbeck | a17fccb | 2015-06-04 16:52:23 +0200 | [diff] [blame] | 937 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s DL analysis, range=%d:%d, lost=%d, recv=%d, " |
| 938 | "skipped=%d, bsn=%d, info='%s'\n", |
| 939 | name(), m_window.v_a(), m_window.v_s(), lost, received, |
| 940 | skipped, bsn, info); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 941 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 942 | res->received_packets = received_packets; |
| 943 | res->lost_packets = lost_packets; |
| 944 | res->received_bytes = received_bytes; |
| 945 | res->lost_bytes = lost_bytes; |
| 946 | |
Jacob Erlbeck | 144a1d0 | 2015-06-04 16:51:44 +0200 | [diff] [blame] | 947 | if (lost + received <= 1) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 948 | return -1; |
| 949 | |
| 950 | return lost * 100 / (lost + received); |
| 951 | } |
| 952 | |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 953 | int gprs_rlcmac_dl_tbf::update_window(unsigned first_bsn, |
| 954 | const struct bitvec *rbb) |
| 955 | { |
aravind sirsikar | fb41afa | 2016-11-02 15:48:00 +0530 | [diff] [blame] | 956 | unsigned dist; |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 957 | uint16_t lost = 0, received = 0; |
| 958 | char show_v_b[RLC_MAX_SNS + 1]; |
| 959 | char show_rbb[RLC_MAX_SNS + 1]; |
| 960 | int error_rate; |
| 961 | struct ana_result ana_res; |
aravind sirsikar | fb41afa | 2016-11-02 15:48:00 +0530 | [diff] [blame] | 962 | dist = m_window.distance(); |
| 963 | unsigned num_blocks = rbb->cur_bit > dist |
| 964 | ? dist : rbb->cur_bit; |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 965 | unsigned behind_last_bsn = m_window.mod_sns(first_bsn + num_blocks); |
| 966 | |
| 967 | Decoding::extract_rbb(rbb, show_rbb); |
| 968 | /* show received array in debug */ |
| 969 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
| 970 | "(BSN=%d) R=ACK I=NACK\n", first_bsn, |
| 971 | show_rbb, m_window.mod_sns(behind_last_bsn - 1)); |
| 972 | |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 973 | error_rate = analyse_errors(show_rbb, behind_last_bsn, &ana_res); |
| 974 | |
| 975 | if (bts_data()->cs_adj_enabled && ms()) |
| 976 | ms()->update_error_rate(this, error_rate); |
| 977 | |
| 978 | m_window.update(bts, rbb, first_bsn, &lost, &received); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 979 | rate_ctr_add(&m_ctrs->ctr[TBF_CTR_RLC_NACKED], lost); |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 980 | |
| 981 | /* report lost and received packets */ |
| 982 | gprs_rlcmac_received_lost(this, received, lost); |
| 983 | |
| 984 | /* Used to measure the leak rate */ |
| 985 | gprs_bssgp_update_bytes_received(ana_res.received_bytes, |
| 986 | ana_res.received_packets + ana_res.lost_packets); |
| 987 | |
| 988 | /* raise V(A), if possible */ |
| 989 | m_window.raise(m_window.move_window()); |
| 990 | |
| 991 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 992 | m_window.show_state(show_v_b); |
| 993 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 994 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 995 | "X=Resend-Unacked I=Invalid\n", |
| 996 | m_window.v_a(), show_v_b, |
| 997 | m_window.v_s_mod(-1)); |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 998 | return 0; |
| 999 | } |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 1000 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1001 | int gprs_rlcmac_dl_tbf::update_window(const uint8_t ssn, const uint8_t *rbb) |
| 1002 | { |
| 1003 | int16_t dist; /* must be signed */ |
| 1004 | uint16_t lost = 0, received = 0; |
| 1005 | char show_rbb[65]; |
| 1006 | char show_v_b[RLC_MAX_SNS + 1]; |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 1007 | int error_rate; |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 1008 | struct ana_result ana_res; |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1009 | |
| 1010 | Decoding::extract_rbb(rbb, show_rbb); |
| 1011 | /* show received array in debug (bit 64..1) */ |
| 1012 | LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\"" |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 1013 | "(BSN=%d) R=ACK I=NACK\n", m_window.mod_sns(ssn - 64), |
| 1014 | show_rbb, m_window.mod_sns(ssn - 1)); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1015 | |
| 1016 | /* apply received array to receive state (SSN-64..SSN-1) */ |
| 1017 | /* calculate distance of ssn from V(S) */ |
Jacob Erlbeck | 93c55d0 | 2015-12-23 16:29:07 +0100 | [diff] [blame] | 1018 | dist = m_window.mod_sns(m_window.v_s() - ssn); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1019 | /* check if distance is less than distance V(A)..V(S) */ |
| 1020 | if (dist >= m_window.distance()) { |
| 1021 | /* this might happpen, if the downlink assignment |
| 1022 | * was not received by ms and the ack refers |
| 1023 | * to previous TBF |
| 1024 | * FIXME: we should implement polling for |
| 1025 | * control ack!*/ |
| 1026 | LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of " |
| 1027 | "V(A)..V(S) range %s Free TBF!\n", tbf_name(this)); |
| 1028 | return 1; /* indicate to free TBF */ |
| 1029 | } |
| 1030 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 1031 | error_rate = analyse_errors(show_rbb, ssn, &ana_res); |
| 1032 | |
| 1033 | if (bts_data()->cs_adj_enabled && ms()) |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 1034 | ms()->update_error_rate(this, error_rate); |
Jacob Erlbeck | 1751c62 | 2015-06-04 12:12:32 +0200 | [diff] [blame] | 1035 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1036 | m_window.update(bts, show_rbb, ssn, |
| 1037 | &lost, &received); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1038 | rate_ctr_add(&m_ctrs->ctr[TBF_CTR_RLC_NACKED], lost); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1039 | |
| 1040 | /* report lost and received packets */ |
| 1041 | gprs_rlcmac_received_lost(this, received, lost); |
| 1042 | |
Jacob Erlbeck | 2db0f08 | 2015-09-07 18:49:00 +0200 | [diff] [blame] | 1043 | /* Used to measure the leak rate */ |
| 1044 | gprs_bssgp_update_bytes_received(ana_res.received_bytes, |
| 1045 | ana_res.received_packets + ana_res.lost_packets); |
| 1046 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1047 | /* raise V(A), if possible */ |
| 1048 | m_window.raise(m_window.move_window()); |
| 1049 | |
| 1050 | /* show receive state array in debug (V(A)..V(S)-1) */ |
| 1051 | m_window.show_state(show_v_b); |
| 1052 | LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\"" |
| 1053 | "(V(S)-1=%d) A=Acked N=Nacked U=Unacked " |
| 1054 | "X=Resend-Unacked I=Invalid\n", |
| 1055 | m_window.v_a(), show_v_b, |
| 1056 | m_window.v_s_mod(-1)); |
| 1057 | |
| 1058 | if (state_is(GPRS_RLCMAC_FINISHED) && m_window.window_empty()) { |
| 1059 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 1060 | "all blocks, but without final ack " |
| 1061 | "inidcation (don't worry)\n"); |
| 1062 | } |
| 1063 | return 0; |
| 1064 | } |
| 1065 | |
| 1066 | |
| 1067 | int gprs_rlcmac_dl_tbf::maybe_start_new_window() |
| 1068 | { |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 1069 | release(); |
| 1070 | |
| 1071 | /* check for LLC PDU in the LLC Queue */ |
Alexander Couzens | d38b92e | 2016-08-21 19:38:30 +0200 | [diff] [blame] | 1072 | if (llc_queue_size() > 0) |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 1073 | /* we have more data so we will re-use this tbf */ |
| 1074 | establish_dl_tbf_on_pacch(); |
| 1075 | |
| 1076 | return 0; |
| 1077 | } |
| 1078 | |
| 1079 | int gprs_rlcmac_dl_tbf::release() |
| 1080 | { |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1081 | uint16_t received; |
| 1082 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1083 | /* range V(A)..V(S)-1 */ |
| 1084 | received = m_window.count_unacked(); |
| 1085 | |
| 1086 | /* report all outstanding packets as received */ |
| 1087 | gprs_rlcmac_received_lost(this, received, 0); |
| 1088 | |
| 1089 | set_state(GPRS_RLCMAC_WAIT_RELEASE); |
| 1090 | |
Jacob Erlbeck | 04e72d3 | 2015-08-13 18:36:56 +0200 | [diff] [blame] | 1091 | /* start T3193 */ |
| 1092 | tbf_timer_start(this, 3193, |
| 1093 | bts_data()->t3193_msec / 1000, |
| 1094 | (bts_data()->t3193_msec % 1000) * 1000); |
| 1095 | |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1096 | /* reset rlc states */ |
| 1097 | m_tx_counter = 0; |
| 1098 | m_wait_confirm = 0; |
| 1099 | m_window.reset(); |
| 1100 | |
| 1101 | /* keep to flags */ |
| 1102 | state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; |
| 1103 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
| 1104 | |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 1105 | return 0; |
| 1106 | } |
| 1107 | |
Jacob Erlbeck | f04a5b3 | 2016-01-21 20:42:40 +0100 | [diff] [blame] | 1108 | int gprs_rlcmac_dl_tbf::abort() |
| 1109 | { |
| 1110 | uint16_t lost; |
| 1111 | |
| 1112 | if (state_is(GPRS_RLCMAC_FLOW)) { |
| 1113 | /* range V(A)..V(S)-1 */ |
| 1114 | lost = m_window.count_unacked(); |
| 1115 | |
| 1116 | /* report all outstanding packets as lost */ |
| 1117 | gprs_rlcmac_received_lost(this, 0, lost); |
| 1118 | gprs_rlcmac_lost_rep(this); |
| 1119 | |
| 1120 | /* TODO: Reschedule all LLC frames starting with the one that is |
| 1121 | * (partly) encoded in chunk 1 of block V(A). (optional) */ |
| 1122 | } |
| 1123 | |
| 1124 | set_state(GPRS_RLCMAC_RELEASING); |
| 1125 | |
| 1126 | /* reset rlc states */ |
| 1127 | m_window.reset(); |
| 1128 | |
| 1129 | /* keep to flags */ |
| 1130 | state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; |
| 1131 | state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); |
| 1132 | |
| 1133 | return 0; |
| 1134 | } |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 1135 | |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 1136 | int gprs_rlcmac_dl_tbf::rcvd_dl_ack(uint8_t final_ack, unsigned first_bsn, |
| 1137 | struct bitvec *rbb) |
| 1138 | { |
Jacob Erlbeck | b4beb54 | 2016-01-15 13:38:31 +0100 | [diff] [blame] | 1139 | int rc; |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 1140 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this)); |
| 1141 | |
Jacob Erlbeck | b4beb54 | 2016-01-15 13:38:31 +0100 | [diff] [blame] | 1142 | rc = update_window(first_bsn, rbb); |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 1143 | |
Jacob Erlbeck | b4beb54 | 2016-01-15 13:38:31 +0100 | [diff] [blame] | 1144 | if (final_ack) { |
| 1145 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 1146 | rc = maybe_start_new_window(); |
| 1147 | } else if (state_is(GPRS_RLCMAC_FINISHED) && m_window.window_empty()) { |
| 1148 | LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " |
| 1149 | "all blocks, but without final ack " |
| 1150 | "indication (don't worry)\n"); |
| 1151 | } |
| 1152 | |
| 1153 | return rc; |
Jacob Erlbeck | eb08f86 | 2016-02-05 17:07:12 +0100 | [diff] [blame] | 1154 | } |
| 1155 | |
Jacob Erlbeck | 91ff7d1 | 2015-09-01 11:20:29 +0200 | [diff] [blame] | 1156 | int gprs_rlcmac_dl_tbf::rcvd_dl_ack(uint8_t final_ack, uint8_t ssn, uint8_t *rbb) |
| 1157 | { |
| 1158 | LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this)); |
| 1159 | |
| 1160 | if (!final_ack) |
| 1161 | return update_window(ssn, rbb); |
| 1162 | |
| 1163 | LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); |
| 1164 | return maybe_start_new_window(); |
Daniel Willmann | ca102af | 2014-08-08 12:14:12 +0200 | [diff] [blame] | 1165 | } |
| 1166 | |
| 1167 | bool gprs_rlcmac_dl_tbf::dl_window_stalled() const |
| 1168 | { |
| 1169 | return m_window.window_stalled(); |
| 1170 | } |
| 1171 | |
Jacob Erlbeck | eceb910 | 2015-03-20 14:41:50 +0100 | [diff] [blame] | 1172 | void gprs_rlcmac_dl_tbf::request_dl_ack() |
| 1173 | { |
| 1174 | m_dl_ack_requested = true; |
| 1175 | } |
| 1176 | |
| 1177 | bool gprs_rlcmac_dl_tbf::need_control_ts() const |
| 1178 | { |
| 1179 | if (poll_state != GPRS_RLCMAC_POLL_NONE) |
| 1180 | return false; |
| 1181 | |
| 1182 | return state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK) || |
| 1183 | m_tx_counter >= POLL_ACK_AFTER_FRAMES || |
| 1184 | m_dl_ack_requested; |
| 1185 | } |
| 1186 | |
| 1187 | bool gprs_rlcmac_dl_tbf::have_data() const |
| 1188 | { |
Jacob Erlbeck | 489a2b3 | 2015-05-28 19:07:01 +0200 | [diff] [blame] | 1189 | return m_llc.chunk_size() > 0 || |
Alexander Couzens | d38b92e | 2016-08-21 19:38:30 +0200 | [diff] [blame] | 1190 | (llc_queue_size() > 0); |
Jacob Erlbeck | eceb910 | 2015-03-20 14:41:50 +0100 | [diff] [blame] | 1191 | } |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 1192 | |
Max | 9dabfa2 | 2017-05-16 16:10:45 +0200 | [diff] [blame] | 1193 | static inline int frames_since_last(int32_t last, unsigned fn) |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 1194 | { |
Max | 9dabfa2 | 2017-05-16 16:10:45 +0200 | [diff] [blame] | 1195 | unsigned wrapped = (fn + GSM_MAX_FN - last) % GSM_MAX_FN; |
| 1196 | |
| 1197 | if (last < 0) |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 1198 | return -1; |
| 1199 | |
Max | 9dabfa2 | 2017-05-16 16:10:45 +0200 | [diff] [blame] | 1200 | if (wrapped < GSM_MAX_FN/2) |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 1201 | return wrapped; |
Max | 9dabfa2 | 2017-05-16 16:10:45 +0200 | [diff] [blame] | 1202 | |
| 1203 | return wrapped - GSM_MAX_FN; |
| 1204 | } |
| 1205 | |
| 1206 | int gprs_rlcmac_dl_tbf::frames_since_last_poll(unsigned fn) const |
| 1207 | { |
| 1208 | return frames_since_last(m_last_dl_poll_fn, fn); |
Jacob Erlbeck | 005ee7f | 2015-03-20 14:53:54 +0100 | [diff] [blame] | 1209 | } |
| 1210 | |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 1211 | int gprs_rlcmac_dl_tbf::frames_since_last_drain(unsigned fn) const |
| 1212 | { |
Max | 9dabfa2 | 2017-05-16 16:10:45 +0200 | [diff] [blame] | 1213 | return frames_since_last(m_last_dl_drained_fn, fn); |
Jacob Erlbeck | 3bed5d1 | 2015-03-19 11:22:38 +0100 | [diff] [blame] | 1214 | } |
| 1215 | |
| 1216 | bool gprs_rlcmac_dl_tbf::keep_open(unsigned fn) const |
| 1217 | { |
| 1218 | int keep_time_frames; |
| 1219 | |
| 1220 | if (bts_data()->dl_tbf_idle_msec <= 0) |
| 1221 | return false; |
| 1222 | |
| 1223 | keep_time_frames = msecs_to_frames(bts_data()->dl_tbf_idle_msec); |
| 1224 | return frames_since_last_drain(fn) <= keep_time_frames; |
| 1225 | } |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 1226 | |
| 1227 | /* |
| 1228 | * This function returns the pointer to data which needs |
| 1229 | * to be copied. Also updates the status of the block related to |
| 1230 | * Split block handling in the RLC/MAC block. |
| 1231 | */ |
| 1232 | enum egprs_rlc_dl_reseg_bsn_state |
| 1233 | gprs_rlcmac_dl_tbf::egprs_dl_get_data(int bsn, uint8_t **block_data) |
| 1234 | { |
| 1235 | gprs_rlc_data *rlc_data = m_rlc.block(bsn); |
| 1236 | egprs_rlc_dl_reseg_bsn_state *block_status_dl = |
| 1237 | &rlc_data->spb_status.block_status_dl; |
| 1238 | |
| 1239 | GprsCodingScheme &cs_current_trans = m_rlc.block(bsn)->cs_current_trans; |
| 1240 | GprsCodingScheme &cs_init = m_rlc.block(bsn)->cs_init; |
| 1241 | *block_data = &rlc_data->block[0]; |
| 1242 | |
| 1243 | /* |
| 1244 | * Table 10.3a.0.1 of 44.060 |
| 1245 | * MCS6,9: second segment starts at 74/2 = 37 |
| 1246 | * MCS5,7: second segment starts at 56/2 = 28 |
| 1247 | * MCS8: second segment starts at 31 |
| 1248 | * MCS4: second segment starts at 44/2 = 22 |
| 1249 | */ |
| 1250 | if (cs_current_trans.headerTypeData() == |
| 1251 | GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3) { |
| 1252 | if (*block_status_dl == EGPRS_RESEG_FIRST_SEG_SENT) { |
| 1253 | switch (GprsCodingScheme::Scheme(cs_init)) { |
| 1254 | case GprsCodingScheme::MCS6 : |
| 1255 | case GprsCodingScheme::MCS9 : |
| 1256 | *block_data = &rlc_data->block[37]; |
| 1257 | break; |
| 1258 | case GprsCodingScheme::MCS7 : |
| 1259 | case GprsCodingScheme::MCS5 : |
| 1260 | *block_data = &rlc_data->block[28]; |
| 1261 | break; |
| 1262 | case GprsCodingScheme::MCS8 : |
| 1263 | *block_data = &rlc_data->block[31]; |
| 1264 | break; |
| 1265 | case GprsCodingScheme::MCS4 : |
| 1266 | *block_data = &rlc_data->block[22]; |
| 1267 | break; |
| 1268 | default: |
| 1269 | LOGP(DRLCMACDL, LOGL_ERROR, "Software error: " |
| 1270 | "--%s hit invalid condition. headerType(%d) " |
| 1271 | " blockstatus(%d) cs(%s) PLEASE FIX!\n", name(), |
| 1272 | cs_current_trans.headerTypeData(), |
| 1273 | *block_status_dl, cs_init.name()); |
| 1274 | break; |
| 1275 | |
| 1276 | } |
| 1277 | return EGPRS_RESEG_SECOND_SEG_SENT; |
| 1278 | } else if ((cs_init.headerTypeData() == |
| 1279 | GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1) || |
| 1280 | (cs_init.headerTypeData() == |
| 1281 | GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_2)) { |
| 1282 | return EGPRS_RESEG_FIRST_SEG_SENT; |
| 1283 | } else if ((GprsCodingScheme::Scheme(cs_init) == |
| 1284 | GprsCodingScheme::MCS4) && |
| 1285 | (GprsCodingScheme::Scheme(cs_current_trans) == |
| 1286 | GprsCodingScheme::MCS1)) { |
| 1287 | return EGPRS_RESEG_FIRST_SEG_SENT; |
| 1288 | } |
| 1289 | } |
| 1290 | return EGPRS_RESEG_DL_DEFAULT; |
| 1291 | } |
| 1292 | |
| 1293 | /* |
| 1294 | * This function returns the status of split block |
| 1295 | * for RLC/MAC block. |
| 1296 | */ |
| 1297 | unsigned int gprs_rlcmac_dl_tbf::get_egprs_dl_spb_status(const int bsn) |
| 1298 | { |
| 1299 | const gprs_rlc_data *rlc_data = m_rlc.block(bsn); |
| 1300 | |
| 1301 | return rlc_data->spb_status.block_status_dl; |
| 1302 | } |
| 1303 | |
| 1304 | /* |
| 1305 | * This function returns the spb value to be sent OTA |
| 1306 | * for RLC/MAC block. |
| 1307 | */ |
| 1308 | enum egprs_rlcmac_dl_spb gprs_rlcmac_dl_tbf::get_egprs_dl_spb(const int bsn) |
| 1309 | { |
| 1310 | struct gprs_rlc_data *rlc_data = m_rlc.block(bsn); |
| 1311 | egprs_rlc_dl_reseg_bsn_state block_status_dl = |
| 1312 | rlc_data->spb_status.block_status_dl; |
| 1313 | |
| 1314 | GprsCodingScheme &cs_current_trans = m_rlc.block(bsn)->cs_current_trans; |
| 1315 | GprsCodingScheme &cs_init = m_rlc.block(bsn)->cs_init; |
| 1316 | |
| 1317 | /* Table 10.4.8b.1 of 44.060 */ |
| 1318 | if (cs_current_trans.headerTypeData() == |
| 1319 | GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3) { |
| 1320 | /* |
| 1321 | * if we are sending the second segment the spb should be 3 |
| 1322 | * other wise it should be 2 |
| 1323 | */ |
| 1324 | if (block_status_dl == EGPRS_RESEG_FIRST_SEG_SENT) { |
sivasankari | da7250a | 2016-12-16 12:57:18 +0530 | [diff] [blame] | 1325 | |
| 1326 | /* statistics */ |
| 1327 | bts->spb_downlink_second_segment(); |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 1328 | return EGPRS_RLCMAC_DL_SEC_SEG; |
| 1329 | } else if ((cs_init.headerTypeData() == |
| 1330 | GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1) || |
| 1331 | (cs_init.headerTypeData() == |
| 1332 | GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_2)) { |
sivasankari | da7250a | 2016-12-16 12:57:18 +0530 | [diff] [blame] | 1333 | bts->spb_downlink_first_segment(); |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 1334 | return EGPRS_RLCMAC_DL_FIRST_SEG; |
| 1335 | } else if ((GprsCodingScheme::Scheme(cs_init) == |
| 1336 | GprsCodingScheme::MCS4) && |
| 1337 | (GprsCodingScheme::Scheme(cs_current_trans) == |
| 1338 | GprsCodingScheme::MCS1)) { |
sivasankari | da7250a | 2016-12-16 12:57:18 +0530 | [diff] [blame] | 1339 | bts->spb_downlink_first_segment(); |
Aravind Sirsikar | 50b0970 | 2016-08-22 17:21:10 +0530 | [diff] [blame] | 1340 | return EGPRS_RLCMAC_DL_FIRST_SEG; |
| 1341 | } |
| 1342 | } |
| 1343 | /* Non SPB cases 0 is reurned */ |
| 1344 | return EGPRS_RLCMAC_DL_NO_RETX; |
| 1345 | } |
Aravind Sirsikar | 8e70bb5 | 2016-09-15 17:51:16 +0530 | [diff] [blame] | 1346 | |
| 1347 | void gprs_rlcmac_dl_tbf::egprs_calc_window_size() |
| 1348 | { |
| 1349 | struct gprs_rlcmac_bts *bts_data = bts->bts_data(); |
| 1350 | unsigned int num_pdch = pcu_bitcount(dl_slots()); |
| 1351 | unsigned int ws = bts_data->ws_base + num_pdch * bts_data->ws_pdch; |
| 1352 | |
| 1353 | ws = (ws / 32) * 32; |
| 1354 | ws = OSMO_MAX(64, ws); |
| 1355 | |
| 1356 | if (num_pdch == 1) |
| 1357 | ws = OSMO_MIN(192, ws); |
| 1358 | else |
| 1359 | ws = OSMO_MIN(128 * num_pdch, ws); |
| 1360 | |
| 1361 | LOGP(DRLCMAC, LOGL_INFO, "%s: Setting EGPRS window size to %d\n", |
| 1362 | name(), ws); |
| 1363 | |
| 1364 | m_window.set_ws(ws); |
| 1365 | } |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1366 | |
| 1367 | void gprs_rlcmac_dl_tbf::update_coding_scheme_counter_dl(const GprsCodingScheme cs) |
| 1368 | { |
| 1369 | uint8_t coding_scheme = 0; |
| 1370 | |
| 1371 | coding_scheme = GprsCodingScheme::Scheme(cs); |
| 1372 | if (cs.isGprs()) { |
| 1373 | switch (coding_scheme) { |
| 1374 | case GprsCodingScheme::CS1 : |
| 1375 | bts->gprs_dl_cs1(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1376 | rate_ctr_inc(&m_dl_gprs_ctrs->ctr[TBF_CTR_GPRS_DL_CS1]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1377 | break; |
| 1378 | case GprsCodingScheme::CS2 : |
| 1379 | bts->gprs_dl_cs2(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1380 | rate_ctr_inc(&m_dl_gprs_ctrs->ctr[TBF_CTR_GPRS_DL_CS2]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1381 | break; |
| 1382 | case GprsCodingScheme::CS3 : |
| 1383 | bts->gprs_dl_cs3(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1384 | rate_ctr_inc(&m_dl_gprs_ctrs->ctr[TBF_CTR_GPRS_DL_CS3]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1385 | break; |
| 1386 | case GprsCodingScheme::CS4 : |
| 1387 | bts->gprs_dl_cs4(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1388 | rate_ctr_inc(&m_dl_gprs_ctrs->ctr[TBF_CTR_GPRS_DL_CS4]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1389 | break; |
| 1390 | } |
| 1391 | } else { |
| 1392 | switch (coding_scheme) { |
| 1393 | case GprsCodingScheme::MCS1 : |
| 1394 | bts->egprs_dl_mcs1(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1395 | rate_ctr_inc(&m_dl_egprs_ctrs->ctr[TBF_CTR_EGPRS_DL_MCS1]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1396 | break; |
| 1397 | case GprsCodingScheme::MCS2 : |
| 1398 | bts->egprs_dl_mcs2(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1399 | rate_ctr_inc(&m_dl_egprs_ctrs->ctr[TBF_CTR_EGPRS_DL_MCS2]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1400 | break; |
| 1401 | case GprsCodingScheme::MCS3 : |
| 1402 | bts->egprs_dl_mcs3(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1403 | rate_ctr_inc(&m_dl_egprs_ctrs->ctr[TBF_CTR_EGPRS_DL_MCS3]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1404 | break; |
| 1405 | case GprsCodingScheme::MCS4 : |
| 1406 | bts->egprs_dl_mcs4(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1407 | rate_ctr_inc(&m_dl_egprs_ctrs->ctr[TBF_CTR_EGPRS_DL_MCS4]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1408 | break; |
| 1409 | case GprsCodingScheme::MCS5 : |
| 1410 | bts->egprs_dl_mcs5(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1411 | rate_ctr_inc(&m_dl_egprs_ctrs->ctr[TBF_CTR_EGPRS_DL_MCS5]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1412 | break; |
| 1413 | case GprsCodingScheme::MCS6 : |
| 1414 | bts->egprs_dl_mcs6(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1415 | rate_ctr_inc(&m_dl_egprs_ctrs->ctr[TBF_CTR_EGPRS_DL_MCS6]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1416 | break; |
| 1417 | case GprsCodingScheme::MCS7 : |
| 1418 | bts->egprs_dl_mcs7(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1419 | rate_ctr_inc(&m_dl_egprs_ctrs->ctr[TBF_CTR_EGPRS_DL_MCS7]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1420 | break; |
| 1421 | case GprsCodingScheme::MCS8 : |
| 1422 | bts->egprs_dl_mcs8(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1423 | rate_ctr_inc(&m_dl_egprs_ctrs->ctr[TBF_CTR_EGPRS_DL_MCS8]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1424 | break; |
| 1425 | case GprsCodingScheme::MCS9 : |
| 1426 | bts->egprs_dl_mcs9(); |
sivasankari | 5395073 | 2016-12-08 17:15:17 +0530 | [diff] [blame] | 1427 | rate_ctr_inc(&m_dl_egprs_ctrs->ctr[TBF_CTR_EGPRS_DL_MCS9]); |
Mrinal Mishra | f86307e | 2016-11-10 18:16:30 +0530 | [diff] [blame] | 1428 | break; |
| 1429 | } |
| 1430 | } |
| 1431 | } |