1128 lines
30 KiB
C++
1128 lines
30 KiB
C++
/* Copied from tbf.cpp
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*
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* Copyright (C) 2012 Ivan Klyuchnikov
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* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
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* Copyright (C) 2013 by Holger Hans Peter Freyther
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <bts.h>
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#include <tbf.h>
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#include <rlc.h>
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#include <gprs_rlcmac.h>
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#include <gprs_debug.h>
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#include <gprs_bssgp_pcu.h>
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#include <gprs_codel.h>
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#include <decoding.h>
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#include <encoding.h>
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#include "pcu_utils.h"
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extern "C" {
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/talloc.h>
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}
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#include <errno.h>
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#include <string.h>
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#include <math.h>
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/* After sending these frames, we poll for ack/nack. */
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#define POLL_ACK_AFTER_FRAMES 20
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extern "C" {
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int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli,
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uint8_t num_frames, uint32_t num_octets);
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}
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static inline void tbf_update_ms_class(struct gprs_rlcmac_tbf *tbf,
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const uint8_t ms_class)
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{
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if (!tbf->ms_class() && ms_class)
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tbf->set_ms_class(ms_class);
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}
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static void llc_timer_cb(void *_tbf)
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{
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struct gprs_rlcmac_dl_tbf *tbf = (struct gprs_rlcmac_dl_tbf *)_tbf;
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if (tbf->state_is_not(GPRS_RLCMAC_FLOW))
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return;
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LOGP(DRLCMAC, LOGL_DEBUG,
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"%s LLC receive timeout, requesting DL ACK\n", tbf_name(tbf));
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tbf->request_dl_ack();
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}
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void gprs_rlcmac_dl_tbf::cleanup()
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{
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osmo_timer_del(&m_llc_timer);
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}
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void gprs_rlcmac_dl_tbf::start_llc_timer()
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{
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if (bts_data()->llc_idle_ack_csec > 0) {
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struct timeval tv;
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/* TODO: this ought to be within a constructor */
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m_llc_timer.data = this;
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m_llc_timer.cb = &llc_timer_cb;
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csecs_to_timeval(bts_data()->llc_idle_ack_csec, &tv);
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osmo_timer_schedule(&m_llc_timer, tv.tv_sec, tv.tv_usec);
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}
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}
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int gprs_rlcmac_dl_tbf::append_data(const uint8_t ms_class,
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const uint16_t pdu_delay_csec,
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const uint8_t *data, const uint16_t len)
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{
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LOGP(DRLCMAC, LOGL_INFO, "%s append\n", tbf_name(this));
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gprs_llc_queue::MetaInfo info;
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struct msgb *llc_msg = msgb_alloc(len, "llc_pdu_queue");
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if (!llc_msg)
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return -ENOMEM;
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gprs_llc_queue::calc_pdu_lifetime(bts, pdu_delay_csec, &info.expire_time);
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gettimeofday(&info.recv_time, NULL);
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memcpy(msgb_put(llc_msg, len), data, len);
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llc_queue()->enqueue(llc_msg, &info);
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tbf_update_ms_class(this, ms_class);
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start_llc_timer();
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if (state_is(GPRS_RLCMAC_WAIT_RELEASE)) {
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LOGP(DRLCMAC, LOGL_DEBUG,
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"%s in WAIT RELEASE state "
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"(T3193), so reuse TBF\n", tbf_name(this));
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tbf_update_ms_class(this, ms_class);
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establish_dl_tbf_on_pacch();
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}
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return 0;
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}
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static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts,
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const char *imsi,
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const uint32_t tlli, const uint32_t tlli_old,
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const uint8_t ms_class,
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const uint8_t egprs_ms_class,
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struct gprs_rlcmac_dl_tbf **tbf)
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{
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uint8_t ss;
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int8_t use_trx;
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uint16_t ta = 0;
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struct gprs_rlcmac_ul_tbf *ul_tbf = NULL, *old_ul_tbf;
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struct gprs_rlcmac_dl_tbf *dl_tbf = NULL;
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GprsMs *ms;
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/* check for uplink data, so we copy our informations */
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#warning "Do the same look up for IMSI, TLLI and OLD_TLLI"
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#warning "Refactor the below lines... into a new method"
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ms = bts->bts->ms_store().get_ms(tlli, tlli_old, imsi);
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if (ms) {
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ul_tbf = ms->ul_tbf();
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ta = ms->ta();
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}
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/* TODO: if (!ms) create MS before tbf_alloc is called? */
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if (ul_tbf && ul_tbf->m_contention_resolution_done
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&& !ul_tbf->m_final_ack_sent) {
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use_trx = ul_tbf->trx->trx_no;
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ss = 0;
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old_ul_tbf = ul_tbf;
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} else {
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use_trx = -1;
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ss = 1; /* PCH assignment only allows one timeslot */
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old_ul_tbf = NULL;
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}
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// Create new TBF (any TRX)
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#warning "Copy and paste with alloc_ul_tbf"
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/* set number of downlink slots according to multislot class */
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dl_tbf = tbf_alloc_dl_tbf(bts, ms, use_trx, ms_class, egprs_ms_class, ss);
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if (!dl_tbf) {
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LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n");
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return -EBUSY;
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}
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dl_tbf->update_ms(tlli, GPRS_RLCMAC_DL_TBF);
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dl_tbf->ms()->set_ta(ta);
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LOGP(DRLCMAC, LOGL_DEBUG, "%s [DOWNLINK] START\n", tbf_name(dl_tbf));
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/* Store IMSI for later look-up and PCH retransmission */
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dl_tbf->assign_imsi(imsi);
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/* trigger downlink assignment and set state to ASSIGN.
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* we don't use old_downlink, so the possible uplink is used
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* to trigger downlink assignment. if there is no uplink,
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* AGCH is used. */
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dl_tbf->bts->trigger_dl_ass(dl_tbf, old_ul_tbf);
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*tbf = dl_tbf;
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return 0;
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}
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/**
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* TODO: split into unit test-able parts...
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*/
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int gprs_rlcmac_dl_tbf::handle(struct gprs_rlcmac_bts *bts,
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const uint32_t tlli, const uint32_t tlli_old, const char *imsi,
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uint8_t ms_class, uint8_t egprs_ms_class,
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const uint16_t delay_csec,
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const uint8_t *data, const uint16_t len)
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{
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struct gprs_rlcmac_dl_tbf *dl_tbf = NULL;
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int rc;
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GprsMs *ms, *ms_old;
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/* check for existing TBF */
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ms = bts->bts->ms_store().get_ms(tlli, tlli_old, imsi);
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if (ms) {
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dl_tbf = ms->dl_tbf();
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/* If we known the GPRS/EGPRS MS class, use it */
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if (ms->ms_class() || ms->egprs_ms_class()) {
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ms_class = ms->ms_class();
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egprs_ms_class = ms->egprs_ms_class();
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}
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}
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if (ms && strlen(ms->imsi()) == 0) {
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ms_old = bts->bts->ms_store().get_ms(0, 0, imsi);
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if (ms_old && ms_old != ms) {
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/* The TLLI has changed (RAU), so there are two MS
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* objects for the same MS */
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LOGP(DRLCMAC, LOGL_NOTICE,
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"There is a new MS object for the same MS: "
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"(0x%08x, '%s') -> (0x%08x, '%s')\n",
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ms_old->tlli(), ms_old->imsi(),
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ms->tlli(), ms->imsi());
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GprsMs::Guard guard_old(ms_old);
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if (!dl_tbf && ms_old->dl_tbf()) {
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LOGP(DRLCMAC, LOGL_NOTICE,
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"%s IMSI %s: "
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"moving DL TBF to new MS object\n",
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dl_tbf->name(), imsi);
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dl_tbf = ms_old->dl_tbf();
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/* Move the DL TBF to the new MS */
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dl_tbf->set_ms(ms);
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}
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/* Clean up the old MS object */
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/* TODO: Put this into a separate function, use timer? */
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if (ms_old->ul_tbf() && ms_old->ul_tbf()->T == 0)
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tbf_free(ms_old->ul_tbf());
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if (ms_old->dl_tbf() && ms_old->dl_tbf()->T == 0)
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tbf_free(ms_old->dl_tbf());
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ms->merge_old_ms(ms_old);
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}
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}
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if (!dl_tbf) {
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rc = tbf_new_dl_assignment(bts, imsi, tlli, tlli_old,
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ms_class, egprs_ms_class, &dl_tbf);
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if (rc < 0)
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return rc;
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}
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/* TODO: ms_class vs. egprs_ms_class is not handled here */
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rc = dl_tbf->append_data(ms_class, delay_csec, data, len);
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dl_tbf->update_ms(tlli, GPRS_RLCMAC_DL_TBF);
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dl_tbf->assign_imsi(imsi);
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return rc;
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}
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struct msgb *gprs_rlcmac_dl_tbf::llc_dequeue(bssgp_bvc_ctx *bctx)
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{
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struct msgb *msg;
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struct timeval tv_now, tv_now2;
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uint32_t octets = 0, frames = 0;
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struct timeval hyst_delta = {0, 0};
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const unsigned keep_small_thresh = 60;
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const gprs_llc_queue::MetaInfo *info;
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if (bts_data()->llc_discard_csec)
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csecs_to_timeval(bts_data()->llc_discard_csec, &hyst_delta);
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gettimeofday(&tv_now, NULL);
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timeradd(&tv_now, &hyst_delta, &tv_now2);
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while ((msg = llc_queue()->dequeue(&info))) {
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const struct timeval *tv_disc = &info->expire_time;
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const struct timeval *tv_recv = &info->recv_time;
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gprs_bssgp_update_queue_delay(tv_recv, &tv_now);
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if (ms() && ms()->codel_state()) {
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int bytes = llc_queue()->octets();
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if (gprs_codel_control(ms()->codel_state(),
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tv_recv, &tv_now, bytes))
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goto drop_frame;
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}
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/* Is the age below the low water mark? */
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if (!gprs_llc_queue::is_frame_expired(&tv_now2, tv_disc))
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break;
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/* Is the age below the high water mark */
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if (!gprs_llc_queue::is_frame_expired(&tv_now, tv_disc)) {
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/* Has the previous message not been dropped? */
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if (frames == 0)
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break;
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/* Hysteresis mode, try to discard LLC messages until
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* the low water mark has been reached */
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/* Check whether to abort the hysteresis mode */
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/* Is the frame small, perhaps only a TCP ACK? */
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if (msg->len <= keep_small_thresh)
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break;
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/* Is it a GMM message? */
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if (!gprs_llc::is_user_data_frame(msg->data, msg->len))
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break;
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}
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bts->llc_timedout_frame();
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drop_frame:
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frames++;
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octets += msg->len;
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msgb_free(msg);
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bts->llc_dropped_frame();
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continue;
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}
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if (frames) {
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LOGP(DRLCMACDL, LOGL_NOTICE, "%s Discarding LLC PDU "
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"because lifetime limit reached, "
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"count=%u new_queue_size=%zu\n",
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tbf_name(this), frames, llc_queue()->size());
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if (frames > 0xff)
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frames = 0xff;
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if (octets > 0xffffff)
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octets = 0xffffff;
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if (bctx)
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bssgp_tx_llc_discarded(bctx, tlli(), frames, octets);
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}
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return msg;
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}
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bool gprs_rlcmac_dl_tbf::restart_bsn_cycle()
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{
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/* If V(S) == V(A) and finished state, we would have received
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* acknowledgement of all transmitted block. In this case we would
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* have transmitted the final block, and received ack from MS. But in
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* this case we did not receive the final ack indication from MS. This
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* should never happen if MS works correctly.
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*/
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if (m_window.window_empty()) {
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LOGP(DRLCMACDL, LOGL_DEBUG, "- MS acked all blocks\n");
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return false;
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}
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/* cycle through all unacked blocks */
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int resend = m_window.mark_for_resend();
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/* At this point there should be at least one unacked block
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* to be resent. If not, this is an software error. */
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if (resend == 0) {
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LOGP(DRLCMACDL, LOGL_ERROR, "Software error: "
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"There are no unacknowledged blocks, but V(A) "
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" != V(S). PLEASE FIX!\n");
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return false;
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}
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return true;
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}
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int gprs_rlcmac_dl_tbf::take_next_bsn(uint32_t fn,
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int previous_bsn, bool *may_combine)
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{
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int bsn;
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int data_len2, force_data_len = -1;
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GprsCodingScheme cs2;
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GprsCodingScheme force_cs;
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bsn = m_window.resend_needed();
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if (previous_bsn >= 0) {
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force_cs = m_rlc.block(previous_bsn)->cs;
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if (!force_cs.isEgprs())
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return -1;
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force_data_len = m_rlc.block(previous_bsn)->len;
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}
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if (bsn >= 0) {
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if (previous_bsn == bsn)
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return -1;
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if (previous_bsn >= 0 &&
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m_window.mod_sns(bsn - previous_bsn) > RLC_EGPRS_MAX_BSN_DELTA)
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return -1;
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cs2 = m_rlc.block(bsn)->cs;
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data_len2 = m_rlc.block(bsn)->len;
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if (force_data_len > 0 && force_data_len != data_len2)
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return -1;
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LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n", bsn);
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/* re-send block with negative aknowlegement */
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m_window.m_v_b.mark_unacked(bsn);
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bts->rlc_resent();
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} else if (state_is(GPRS_RLCMAC_FINISHED)) {
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LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, "
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"because all blocks have been transmitted.\n",
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m_window.v_a());
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bts->rlc_restarted();
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if (restart_bsn_cycle())
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return take_next_bsn(fn, previous_bsn, may_combine);
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} else if (dl_window_stalled()) {
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LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, "
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"because the window is stalled.\n",
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m_window.v_a());
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bts->rlc_stalled();
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if (restart_bsn_cycle())
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return take_next_bsn(fn, previous_bsn, may_combine);
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} else if (have_data()) {
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/* New blocks may be send */
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cs2 = force_cs ? force_cs : current_cs();
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LOGP(DRLCMACDL, LOGL_DEBUG,
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"- Sending new block at BSN %d, CS=%s\n",
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m_window.v_s(), cs2.name());
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bsn = create_new_bsn(fn, cs2);
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} else if (!m_window.window_empty()) {
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LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, "
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"because all blocks have been transmitted (FLOW).\n",
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m_window.v_a());
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bts->rlc_restarted();
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if (restart_bsn_cycle())
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return take_next_bsn(fn, previous_bsn, may_combine);
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} else {
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/* Nothing left to send, create dummy LLC commands */
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LOGP(DRLCMACDL, LOGL_DEBUG,
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"- Sending new dummy block at BSN %d, CS=%s\n",
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m_window.v_s(), current_cs().name());
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bsn = create_new_bsn(fn, current_cs());
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/* Don't send a second block, so don't set cs2 */
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}
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if (bsn < 0) {
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/* we just send final block again */
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LOGP(DRLCMACDL, LOGL_DEBUG,
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"- Nothing else to send, Re-transmit final block!\n");
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bsn = m_window.v_s_mod(-1);
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bts->rlc_resent();
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}
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*may_combine = cs2.numDataBlocks() > 1;
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return bsn;
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}
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/*
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* Create DL data block
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* The messages are fragmented and forwarded as data blocks.
|
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*/
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struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block(uint32_t fn, uint8_t ts)
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{
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int bsn, bsn2 = -1;
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bool may_combine;
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LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink (V(A)==%d .. "
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"V(S)==%d)\n", tbf_name(this),
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m_window.v_a(), m_window.v_s());
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bsn = take_next_bsn(fn, -1, &may_combine);
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if (bsn < 0)
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return NULL;
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|
|
if (may_combine)
|
|
bsn2 = take_next_bsn(fn, bsn, &may_combine);
|
|
|
|
return create_dl_acked_block(fn, ts, bsn, bsn2);
|
|
}
|
|
|
|
void gprs_rlcmac_dl_tbf::schedule_next_frame()
|
|
{
|
|
struct msgb *msg;
|
|
|
|
if (m_llc.frame_length() != 0)
|
|
return;
|
|
|
|
/* dequeue next LLC frame, if any */
|
|
msg = llc_dequeue(gprs_bssgp_pcu_current_bctx());
|
|
if (!msg)
|
|
return;
|
|
|
|
LOGP(DRLCMACDL, LOGL_INFO,
|
|
"- Dequeue next LLC for %s (len=%d)\n",
|
|
tbf_name(this), msg->len);
|
|
|
|
m_llc.put_frame(msg->data, msg->len);
|
|
bts->llc_frame_sched();
|
|
msgb_free(msg);
|
|
m_last_dl_drained_fn = -1;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::create_new_bsn(const uint32_t fn, GprsCodingScheme cs)
|
|
{
|
|
uint8_t *data;
|
|
gprs_rlc_data *rlc_data;
|
|
const uint16_t bsn = m_window.v_s();
|
|
gprs_rlc_data_block_info *rdbi;
|
|
int num_chunks = 0;
|
|
int write_offset = 0;
|
|
Encoding::AppendResult ar;
|
|
|
|
if (m_llc.frame_length() == 0)
|
|
schedule_next_frame();
|
|
|
|
OSMO_ASSERT(cs.isValid());
|
|
|
|
/* length of usable data block (single data unit w/o header) */
|
|
const uint8_t block_data_len = cs.maxDataBlockBytes();
|
|
|
|
/* now we still have untransmitted LLC data, so we fill mac block */
|
|
rlc_data = m_rlc.block(bsn);
|
|
data = rlc_data->prepare(block_data_len);
|
|
rlc_data->cs = cs;
|
|
rlc_data->len = block_data_len;
|
|
|
|
rdbi = &(rlc_data->block_info);
|
|
memset(rdbi, 0, sizeof(*rdbi));
|
|
rdbi->data_len = block_data_len;
|
|
|
|
rdbi->cv = 15; /* Final Block Indicator, set late, if true */
|
|
rdbi->bsn = bsn; /* Block Sequence Number */
|
|
rdbi->e = 1; /* Extension bit, maybe set later (1: no extension) */
|
|
|
|
do {
|
|
bool is_final;
|
|
|
|
if (m_llc.frame_length() == 0) {
|
|
int space = block_data_len - write_offset;
|
|
/* A header will need to by added, so we just need
|
|
* space-1 octets */
|
|
m_llc.put_dummy_frame(space - 1);
|
|
|
|
/* The data just drained, store the current fn */
|
|
if (m_last_dl_drained_fn < 0)
|
|
m_last_dl_drained_fn = fn;
|
|
|
|
/* It is not clear, when the next real data will
|
|
* arrive, so request a DL ack/nack now */
|
|
request_dl_ack();
|
|
|
|
LOGP(DRLCMACDL, LOGL_DEBUG,
|
|
"-- Empty chunk, "
|
|
"added LLC dummy command of size %d, "
|
|
"drained_since=%d\n",
|
|
m_llc.frame_length(), frames_since_last_drain(fn));
|
|
}
|
|
|
|
is_final = llc_queue()->size() == 0 && !keep_open(fn);
|
|
|
|
ar = Encoding::rlc_data_to_dl_append(rdbi, cs,
|
|
&m_llc, &write_offset, &num_chunks, data, is_final);
|
|
|
|
if (ar == Encoding::AR_NEED_MORE_BLOCKS)
|
|
break;
|
|
|
|
LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for %s"
|
|
"len=%d\n", tbf_name(this), m_llc.frame_length());
|
|
gprs_rlcmac_dl_bw(this, m_llc.frame_length());
|
|
m_llc.reset();
|
|
|
|
if (is_final) {
|
|
request_dl_ack();
|
|
set_state(GPRS_RLCMAC_FINISHED);
|
|
}
|
|
|
|
/* dequeue next LLC frame, if any */
|
|
schedule_next_frame();
|
|
} while (ar == Encoding::AR_COMPLETED_SPACE_LEFT);
|
|
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "data block (BSN %d, %s): %s\n",
|
|
bsn, rlc_data->cs.name(),
|
|
osmo_hexdump(rlc_data->block, block_data_len));
|
|
/* raise send state and set ack state array */
|
|
m_window.m_v_b.mark_unacked(bsn);
|
|
m_window.increment_send();
|
|
|
|
return bsn;
|
|
}
|
|
|
|
struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block(
|
|
const uint32_t fn, const uint8_t ts,
|
|
int index, int index2)
|
|
{
|
|
uint8_t *msg_data;
|
|
struct msgb *dl_msg;
|
|
unsigned msg_len;
|
|
bool need_poll;
|
|
/* TODO: support MCS-7 - MCS-9, where data_block_idx can be 1 */
|
|
unsigned int data_block_idx = 0;
|
|
unsigned int rrbp;
|
|
uint32_t new_poll_fn;
|
|
int rc;
|
|
bool is_final = false;
|
|
gprs_rlc_data_info rlc;
|
|
GprsCodingScheme cs;
|
|
int bsns[ARRAY_SIZE(rlc.block_info)];
|
|
unsigned num_bsns;
|
|
int punct[ARRAY_SIZE(rlc.block_info)];
|
|
bool need_padding = false;
|
|
|
|
/*
|
|
* TODO: This is an experimental work-around to put 2 BSN into
|
|
* MSC-7 to MCS-9 encoded messages. It just sends the same BSN
|
|
* twice in the block. The cs should be derived from the TBF's
|
|
* current CS such that both BSNs (that must be compatible) can
|
|
* be put into the data area, even if the resulting CS is higher than
|
|
* the current limit.
|
|
*/
|
|
cs = m_rlc.block(index)->cs;
|
|
bsns[0] = index;
|
|
num_bsns = 1;
|
|
|
|
if (index2 >= 0) {
|
|
bsns[num_bsns] = index2;
|
|
num_bsns += 1;
|
|
}
|
|
|
|
if (num_bsns == 1) {
|
|
/* TODO: remove the conditional when MCS-6 padding isn't
|
|
* failing to be decoded by MEs anymore */
|
|
if (cs != GprsCodingScheme(GprsCodingScheme::MCS8))
|
|
cs.decToSingleBlock(&need_padding);
|
|
}
|
|
|
|
gprs_rlc_data_info_init_dl(&rlc, cs, need_padding);
|
|
|
|
rlc.usf = 7; /* will be set at scheduler */
|
|
rlc.pr = 0; /* FIXME: power reduction */
|
|
rlc.tfi = m_tfi; /* TFI */
|
|
|
|
/* return data block(s) as message */
|
|
msg_len = cs.sizeDL();
|
|
dl_msg = msgb_alloc(msg_len, "rlcmac_dl_data");
|
|
if (!dl_msg)
|
|
return NULL;
|
|
|
|
msg_data = msgb_put(dl_msg, msg_len);
|
|
|
|
/* Copy block(s) to RLC message */
|
|
for (data_block_idx = 0; data_block_idx < rlc.num_data_blocks;
|
|
data_block_idx++)
|
|
{
|
|
int bsn;
|
|
GprsCodingScheme cs_enc;
|
|
uint8_t *block_data;
|
|
gprs_rlc_data_block_info *rdbi, *block_info;
|
|
|
|
/* Check if there are more blocks than BSNs */
|
|
if (data_block_idx < num_bsns)
|
|
bsn = bsns[data_block_idx];
|
|
else
|
|
bsn = bsns[0];
|
|
|
|
cs_enc = m_rlc.block(bsn)->cs;
|
|
|
|
/* get data and header from current block */
|
|
block_data = m_rlc.block(bsn)->block;
|
|
|
|
/* TODO: Use real puncturing values */
|
|
punct[data_block_idx] = data_block_idx;
|
|
|
|
rdbi = &rlc.block_info[data_block_idx];
|
|
block_info = &m_rlc.block(bsn)->block_info;
|
|
|
|
if(rdbi->data_len != m_rlc.block(bsn)->len) {
|
|
LOGP(DRLCMACDL, LOGL_ERROR,
|
|
"ERROR: Expected len = %d for %s instead of "
|
|
"%d in data unit %d (BSN %d, %s)\n",
|
|
rdbi->data_len, cs.name(), m_rlc.block(bsn)->len,
|
|
data_block_idx, bsn, cs_enc.name());
|
|
OSMO_ASSERT(rdbi->data_len == m_rlc.block(bsn)->len);
|
|
}
|
|
rdbi->e = block_info->e;
|
|
rdbi->cv = block_info->cv;
|
|
rdbi->bsn = bsn;
|
|
is_final = is_final || rdbi->cv == 0;
|
|
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- Copying data unit %d (BSN %d)\n",
|
|
data_block_idx, bsn);
|
|
|
|
Encoding::rlc_copy_from_aligned_buffer(&rlc, data_block_idx,
|
|
msg_data, block_data);
|
|
}
|
|
|
|
OSMO_ASSERT(ARRAY_SIZE(punct) >= 2);
|
|
rlc.cps = gprs_rlc_mcs_cps(cs, punct[0], punct[1], need_padding);
|
|
|
|
/* If the TBF has just started, relate frames_since_last_poll to the
|
|
* current fn */
|
|
if (m_last_dl_poll_fn < 0)
|
|
m_last_dl_poll_fn = fn;
|
|
|
|
need_poll = state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK);
|
|
|
|
/* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx.
|
|
*/
|
|
if (m_tx_counter >= POLL_ACK_AFTER_FRAMES || m_dl_ack_requested ||
|
|
need_poll) {
|
|
if (m_dl_ack_requested) {
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack "
|
|
"polling, because is was requested explicitly "
|
|
"(e.g. first final block sent).\n");
|
|
} else if (need_poll) {
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack "
|
|
"polling, because polling timed out.\n");
|
|
} else {
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack "
|
|
"polling, because %d blocks sent.\n",
|
|
POLL_ACK_AFTER_FRAMES);
|
|
}
|
|
|
|
rc = check_polling(fn, ts, &new_poll_fn, &rrbp);
|
|
if (rc >= 0) {
|
|
set_polling(new_poll_fn, ts);
|
|
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "Polling scheduled in this "
|
|
"TS %d\n", ts);
|
|
m_tx_counter = 0;
|
|
/* start timer whenever we send the final block */
|
|
if (is_final)
|
|
tbf_timer_start(this, 3191, bts_data()->t3191, 0);
|
|
|
|
/* Clear poll timeout flag */
|
|
state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK);
|
|
|
|
/* Clear request flag */
|
|
m_dl_ack_requested = false;
|
|
|
|
/* set polling in header */
|
|
rlc.rrbp = rrbp;
|
|
rlc.es_p = 1; /* Polling */
|
|
|
|
m_last_dl_poll_fn = poll_fn;
|
|
|
|
LOGP(DRLCMACDL, LOGL_INFO,
|
|
"%s Scheduled Ack/Nack polling on FN=%d, TS=%d\n",
|
|
name(), poll_fn, poll_ts);
|
|
}
|
|
}
|
|
|
|
Encoding::rlc_write_dl_data_header(&rlc, msg_data);
|
|
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "msg block (BSN %d, %s%s): %s\n",
|
|
index, cs.name(),
|
|
need_padding ? ", padded" : "",
|
|
msgb_hexdump(dl_msg));
|
|
|
|
/* Increment TX-counter */
|
|
m_tx_counter++;
|
|
|
|
bts->rlc_sent();
|
|
|
|
return dl_msg;
|
|
}
|
|
|
|
static uint16_t bitnum_to_bsn(int bitnum, uint16_t ssn)
|
|
{
|
|
return ssn - 1 - bitnum;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::analyse_errors(char *show_rbb, uint8_t ssn,
|
|
ana_result *res)
|
|
{
|
|
gprs_rlc_data *rlc_data;
|
|
uint16_t lost = 0, received = 0, skipped = 0;
|
|
char info[RLC_MAX_WS + 1];
|
|
memset(info, '.', m_window.ws());
|
|
info[m_window.ws()] = 0;
|
|
uint16_t bsn = 0;
|
|
unsigned received_bytes = 0, lost_bytes = 0;
|
|
unsigned received_packets = 0, lost_packets = 0;
|
|
unsigned num_blocks = strlen(show_rbb);
|
|
|
|
/* SSN - 1 is in range V(A)..V(S)-1 */
|
|
for (unsigned int bitpos = 0; bitpos < num_blocks; bitpos++) {
|
|
bool is_received;
|
|
int index = num_blocks - 1 - bitpos;
|
|
|
|
is_received = (index >= 0 && show_rbb[index] == 'R');
|
|
|
|
bsn = m_window.mod_sns(bitnum_to_bsn(bitpos, ssn));
|
|
|
|
if (bsn == m_window.mod_sns(m_window.v_a() - 1)) {
|
|
info[bitpos] = '$';
|
|
break;
|
|
}
|
|
|
|
rlc_data = m_rlc.block(bsn);
|
|
if (!rlc_data) {
|
|
info[bitpos] = '0';
|
|
continue;
|
|
}
|
|
|
|
/* Get general statistics */
|
|
if (is_received && !m_window.m_v_b.is_acked(bsn)) {
|
|
received_packets += 1;
|
|
received_bytes += rlc_data->len;
|
|
} else if (!is_received && !m_window.m_v_b.is_nacked(bsn)) {
|
|
lost_packets += 1;
|
|
lost_bytes += rlc_data->len;
|
|
}
|
|
|
|
/* Get statistics for current CS */
|
|
|
|
if (rlc_data->cs != current_cs()) {
|
|
/* This block has already been encoded with a different
|
|
* CS, so it doesn't help us to decide, whether the
|
|
* current CS is ok. Ignore it. */
|
|
info[bitpos] = 'x';
|
|
skipped += 1;
|
|
continue;
|
|
}
|
|
|
|
if (is_received) {
|
|
if (!m_window.m_v_b.is_acked(bsn)) {
|
|
received += 1;
|
|
info[bitpos] = 'R';
|
|
} else {
|
|
info[bitpos] = 'r';
|
|
}
|
|
} else {
|
|
info[bitpos] = 'L';
|
|
lost += 1;
|
|
}
|
|
}
|
|
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "%s DL analysis, range=%d:%d, lost=%d, recv=%d, "
|
|
"skipped=%d, bsn=%d, info='%s'\n",
|
|
name(), m_window.v_a(), m_window.v_s(), lost, received,
|
|
skipped, bsn, info);
|
|
|
|
res->received_packets = received_packets;
|
|
res->lost_packets = lost_packets;
|
|
res->received_bytes = received_bytes;
|
|
res->lost_bytes = lost_bytes;
|
|
|
|
if (lost + received <= 1)
|
|
return -1;
|
|
|
|
return lost * 100 / (lost + received);
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::update_window(unsigned first_bsn,
|
|
const struct bitvec *rbb)
|
|
{
|
|
int16_t dist; /* must be signed */
|
|
uint16_t lost = 0, received = 0;
|
|
char show_v_b[RLC_MAX_SNS + 1];
|
|
char show_rbb[RLC_MAX_SNS + 1];
|
|
int error_rate;
|
|
struct ana_result ana_res;
|
|
unsigned num_blocks = rbb->cur_bit;
|
|
unsigned behind_last_bsn = m_window.mod_sns(first_bsn + num_blocks);
|
|
|
|
Decoding::extract_rbb(rbb, show_rbb);
|
|
/* show received array in debug */
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\""
|
|
"(BSN=%d) R=ACK I=NACK\n", first_bsn,
|
|
show_rbb, m_window.mod_sns(behind_last_bsn - 1));
|
|
|
|
/* apply received array to receive state (first_bsn..behind_last_bsn-1) */
|
|
if (num_blocks > 0) {
|
|
/* calculate distance of ssn from V(S) */
|
|
dist = m_window.mod_sns(m_window.v_s() - behind_last_bsn);
|
|
/* check if distance is less than distance V(A)..V(S) */
|
|
if (dist >= m_window.distance()) {
|
|
/* this might happpen, if the downlink assignment
|
|
* was not received by ms and the ack refers
|
|
* to previous TBF
|
|
* FIXME: we should implement polling for
|
|
* control ack!
|
|
* TODO: check whether this FIXME still makes sense
|
|
*/
|
|
LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of "
|
|
"V(A)..V(S) range %s Free TBF!\n", tbf_name(this));
|
|
return 1; /* indicate to free TBF */
|
|
}
|
|
}
|
|
|
|
error_rate = analyse_errors(show_rbb, behind_last_bsn, &ana_res);
|
|
|
|
if (bts_data()->cs_adj_enabled && ms())
|
|
ms()->update_error_rate(this, error_rate);
|
|
|
|
m_window.update(bts, rbb, first_bsn, &lost, &received);
|
|
|
|
/* report lost and received packets */
|
|
gprs_rlcmac_received_lost(this, received, lost);
|
|
|
|
/* Used to measure the leak rate */
|
|
gprs_bssgp_update_bytes_received(ana_res.received_bytes,
|
|
ana_res.received_packets + ana_res.lost_packets);
|
|
|
|
/* raise V(A), if possible */
|
|
m_window.raise(m_window.move_window());
|
|
|
|
/* show receive state array in debug (V(A)..V(S)-1) */
|
|
m_window.show_state(show_v_b);
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\""
|
|
"(V(S)-1=%d) A=Acked N=Nacked U=Unacked "
|
|
"X=Resend-Unacked I=Invalid\n",
|
|
m_window.v_a(), show_v_b,
|
|
m_window.v_s_mod(-1));
|
|
return 0;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::update_window(const uint8_t ssn, const uint8_t *rbb)
|
|
{
|
|
int16_t dist; /* must be signed */
|
|
uint16_t lost = 0, received = 0;
|
|
char show_rbb[65];
|
|
char show_v_b[RLC_MAX_SNS + 1];
|
|
int error_rate;
|
|
struct ana_result ana_res;
|
|
|
|
Decoding::extract_rbb(rbb, show_rbb);
|
|
/* show received array in debug (bit 64..1) */
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\""
|
|
"(BSN=%d) R=ACK I=NACK\n", m_window.mod_sns(ssn - 64),
|
|
show_rbb, m_window.mod_sns(ssn - 1));
|
|
|
|
/* apply received array to receive state (SSN-64..SSN-1) */
|
|
/* calculate distance of ssn from V(S) */
|
|
dist = m_window.mod_sns(m_window.v_s() - ssn);
|
|
/* check if distance is less than distance V(A)..V(S) */
|
|
if (dist >= m_window.distance()) {
|
|
/* this might happpen, if the downlink assignment
|
|
* was not received by ms and the ack refers
|
|
* to previous TBF
|
|
* FIXME: we should implement polling for
|
|
* control ack!*/
|
|
LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of "
|
|
"V(A)..V(S) range %s Free TBF!\n", tbf_name(this));
|
|
return 1; /* indicate to free TBF */
|
|
}
|
|
|
|
error_rate = analyse_errors(show_rbb, ssn, &ana_res);
|
|
|
|
if (bts_data()->cs_adj_enabled && ms())
|
|
ms()->update_error_rate(this, error_rate);
|
|
|
|
m_window.update(bts, show_rbb, ssn,
|
|
&lost, &received);
|
|
|
|
/* report lost and received packets */
|
|
gprs_rlcmac_received_lost(this, received, lost);
|
|
|
|
/* Used to measure the leak rate */
|
|
gprs_bssgp_update_bytes_received(ana_res.received_bytes,
|
|
ana_res.received_packets + ana_res.lost_packets);
|
|
|
|
/* raise V(A), if possible */
|
|
m_window.raise(m_window.move_window());
|
|
|
|
/* show receive state array in debug (V(A)..V(S)-1) */
|
|
m_window.show_state(show_v_b);
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\""
|
|
"(V(S)-1=%d) A=Acked N=Nacked U=Unacked "
|
|
"X=Resend-Unacked I=Invalid\n",
|
|
m_window.v_a(), show_v_b,
|
|
m_window.v_s_mod(-1));
|
|
|
|
if (state_is(GPRS_RLCMAC_FINISHED) && m_window.window_empty()) {
|
|
LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of "
|
|
"all blocks, but without final ack "
|
|
"inidcation (don't worry)\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
int gprs_rlcmac_dl_tbf::maybe_start_new_window()
|
|
{
|
|
release();
|
|
|
|
/* check for LLC PDU in the LLC Queue */
|
|
if (llc_queue()->size() > 0)
|
|
/* we have more data so we will re-use this tbf */
|
|
establish_dl_tbf_on_pacch();
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::release()
|
|
{
|
|
uint16_t received;
|
|
|
|
/* range V(A)..V(S)-1 */
|
|
received = m_window.count_unacked();
|
|
|
|
/* report all outstanding packets as received */
|
|
gprs_rlcmac_received_lost(this, received, 0);
|
|
|
|
set_state(GPRS_RLCMAC_WAIT_RELEASE);
|
|
|
|
/* start T3193 */
|
|
tbf_timer_start(this, 3193,
|
|
bts_data()->t3193_msec / 1000,
|
|
(bts_data()->t3193_msec % 1000) * 1000);
|
|
|
|
/* reset rlc states */
|
|
m_tx_counter = 0;
|
|
m_wait_confirm = 0;
|
|
m_window.reset();
|
|
|
|
/* keep to flags */
|
|
state_flags &= GPRS_RLCMAC_FLAG_TO_MASK;
|
|
state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::abort()
|
|
{
|
|
uint16_t lost;
|
|
|
|
if (state_is(GPRS_RLCMAC_FLOW)) {
|
|
/* range V(A)..V(S)-1 */
|
|
lost = m_window.count_unacked();
|
|
|
|
/* report all outstanding packets as lost */
|
|
gprs_rlcmac_received_lost(this, 0, lost);
|
|
gprs_rlcmac_lost_rep(this);
|
|
|
|
/* TODO: Reschedule all LLC frames starting with the one that is
|
|
* (partly) encoded in chunk 1 of block V(A). (optional) */
|
|
}
|
|
|
|
set_state(GPRS_RLCMAC_RELEASING);
|
|
|
|
/* reset rlc states */
|
|
m_window.reset();
|
|
|
|
/* keep to flags */
|
|
state_flags &= GPRS_RLCMAC_FLAG_TO_MASK;
|
|
state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::rcvd_dl_ack(uint8_t final_ack, unsigned first_bsn,
|
|
struct bitvec *rbb)
|
|
{
|
|
int rc;
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this));
|
|
|
|
rc = update_window(first_bsn, rbb);
|
|
|
|
if (final_ack) {
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n");
|
|
rc = maybe_start_new_window();
|
|
} else if (state_is(GPRS_RLCMAC_FINISHED) && m_window.window_empty()) {
|
|
LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of "
|
|
"all blocks, but without final ack "
|
|
"indication (don't worry)\n");
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::rcvd_dl_ack(uint8_t final_ack, uint8_t ssn, uint8_t *rbb)
|
|
{
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "%s downlink acknowledge\n", tbf_name(this));
|
|
|
|
if (!final_ack)
|
|
return update_window(ssn, rbb);
|
|
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n");
|
|
return maybe_start_new_window();
|
|
}
|
|
|
|
bool gprs_rlcmac_dl_tbf::dl_window_stalled() const
|
|
{
|
|
return m_window.window_stalled();
|
|
}
|
|
|
|
void gprs_rlcmac_dl_tbf::request_dl_ack()
|
|
{
|
|
m_dl_ack_requested = true;
|
|
}
|
|
|
|
bool gprs_rlcmac_dl_tbf::need_control_ts() const
|
|
{
|
|
if (poll_state != GPRS_RLCMAC_POLL_NONE)
|
|
return false;
|
|
|
|
return state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK) ||
|
|
m_tx_counter >= POLL_ACK_AFTER_FRAMES ||
|
|
m_dl_ack_requested;
|
|
}
|
|
|
|
bool gprs_rlcmac_dl_tbf::have_data() const
|
|
{
|
|
return m_llc.chunk_size() > 0 ||
|
|
(llc_queue() && llc_queue()->size() > 0);
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::frames_since_last_poll(unsigned fn) const
|
|
{
|
|
unsigned wrapped;
|
|
if (m_last_dl_poll_fn < 0)
|
|
return -1;
|
|
|
|
wrapped = (fn + 2715648 - m_last_dl_poll_fn) % 2715648;
|
|
if (wrapped < 2715648/2)
|
|
return wrapped;
|
|
else
|
|
return wrapped - 2715648;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::frames_since_last_drain(unsigned fn) const
|
|
{
|
|
unsigned wrapped;
|
|
if (m_last_dl_drained_fn < 0)
|
|
return -1;
|
|
|
|
wrapped = (fn + 2715648 - m_last_dl_drained_fn) % 2715648;
|
|
if (wrapped < 2715648/2)
|
|
return wrapped;
|
|
else
|
|
return wrapped - 2715648;
|
|
}
|
|
|
|
bool gprs_rlcmac_dl_tbf::keep_open(unsigned fn) const
|
|
{
|
|
int keep_time_frames;
|
|
|
|
if (bts_data()->dl_tbf_idle_msec <= 0)
|
|
return false;
|
|
|
|
keep_time_frames = msecs_to_frames(bts_data()->dl_tbf_idle_msec);
|
|
return frames_since_last_drain(fn) <= keep_time_frames;
|
|
}
|