1575 lines
45 KiB
C++
1575 lines
45 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 <tbf_dl.h>
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#include <tbf_ul.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 <gprs_ms.h>
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#include <gprs_ms_storage.h>
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#include <llc.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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#include <osmocom/gprs/gprs_bssgp_bss.h>
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#include <osmocom/core/bitvec.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/rate_ctr.h>
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#include <osmocom/core/stats.h>
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#include <osmocom/core/timer.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <osmocom/gsm/protocol/gsm_04_08.h>
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#include "coding_scheme.h"
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}
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#include <errno.h>
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#include <string.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 void *tall_pcu_ctx;
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static const struct rate_ctr_desc tbf_dl_gprs_ctr_description[] = {
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{ "gprs:downlink:cs1", "CS1 " },
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{ "gprs:downlink:cs2", "CS2 " },
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{ "gprs:downlink:cs3", "CS3 " },
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{ "gprs:downlink:cs4", "CS4 " },
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};
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static const struct rate_ctr_desc tbf_dl_egprs_ctr_description[] = {
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{ "egprs:downlink:mcs1", "MCS1 " },
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{ "egprs:downlink:mcs2", "MCS2 " },
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{ "egprs:downlink:mcs3", "MCS3 " },
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{ "egprs:downlink:mcs4", "MCS4 " },
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{ "egprs:downlink:mcs5", "MCS5 " },
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{ "egprs:downlink:mcs6", "MCS6 " },
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{ "egprs:downlink:mcs7", "MCS7 " },
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{ "egprs:downlink:mcs8", "MCS8 " },
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{ "egprs:downlink:mcs9", "MCS9 " },
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};
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static const struct rate_ctr_group_desc tbf_dl_gprs_ctrg_desc = {
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"tbf:gprs",
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"Data Blocks",
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OSMO_STATS_CLASS_SUBSCRIBER,
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ARRAY_SIZE(tbf_dl_gprs_ctr_description),
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tbf_dl_gprs_ctr_description,
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};
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static const struct rate_ctr_group_desc tbf_dl_egprs_ctrg_desc = {
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"tbf:egprs",
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"Data Blocks",
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OSMO_STATS_CLASS_SUBSCRIBER,
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ARRAY_SIZE(tbf_dl_egprs_ctr_description),
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tbf_dl_egprs_ctr_description,
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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(TBF_ST_FLOW))
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return;
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LOGPTBFDL(tbf, LOGL_DEBUG, "LLC receive timeout, requesting DL ACK\n");
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tbf->request_dl_ack();
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}
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gprs_rlcmac_dl_tbf::BandWidth::BandWidth() :
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dl_bw_octets(0),
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dl_throughput(0),
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dl_loss_lost(0),
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dl_loss_received(0)
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{
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timespecclear(&dl_bw_tv);
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timespecclear(&dl_loss_tv);
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}
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static int dl_tbf_dtor(struct gprs_rlcmac_dl_tbf *tbf)
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{
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tbf->~gprs_rlcmac_dl_tbf();
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return 0;
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}
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struct gprs_rlcmac_dl_tbf *tbf_alloc_dl_tbf(struct gprs_rlcmac_bts *bts, GprsMs *ms, int8_t use_trx, bool single_slot)
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{
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struct gprs_rlcmac_dl_tbf *tbf;
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int rc;
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OSMO_ASSERT(ms != NULL);
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LOGPMS(ms, DTBF, LOGL_DEBUG, "********** DL-TBF starts here **********\n");
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LOGPMS(ms, DTBF, LOGL_INFO, "Allocating DL TBF\n");
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tbf = talloc(tall_pcu_ctx, struct gprs_rlcmac_dl_tbf);
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if (!tbf)
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return NULL;
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talloc_set_destructor(tbf, dl_tbf_dtor);
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new (tbf) gprs_rlcmac_dl_tbf(bts, ms);
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rc = tbf->setup(use_trx, single_slot);
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/* if no resource */
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if (rc < 0) {
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talloc_free(tbf);
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return NULL;
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}
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if (tbf->is_egprs_enabled()) {
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tbf->set_window_size();
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tbf->m_dl_egprs_ctrs = rate_ctr_group_alloc(tbf,
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&tbf_dl_egprs_ctrg_desc,
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tbf->m_ctrs->idx);
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if (!tbf->m_dl_egprs_ctrs) {
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LOGPTBF(tbf, LOGL_ERROR, "Couldn't allocate EGPRS DL counters\n");
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talloc_free(tbf);
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return NULL;
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}
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} else {
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tbf->m_dl_gprs_ctrs = rate_ctr_group_alloc(tbf,
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&tbf_dl_gprs_ctrg_desc,
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tbf->m_ctrs->idx);
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if (!tbf->m_dl_gprs_ctrs) {
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LOGPTBF(tbf, LOGL_ERROR, "Couldn't allocate GPRS DL counters\n");
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talloc_free(tbf);
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return NULL;
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}
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}
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llist_add(tbf_trx_list((struct gprs_rlcmac_tbf *)tbf), &tbf->trx->dl_tbfs);
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bts_do_rate_ctr_inc(tbf->bts, CTR_TBF_DL_ALLOCATED);
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osmo_clock_gettime(CLOCK_MONOTONIC, &tbf->m_bw.dl_bw_tv);
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osmo_clock_gettime(CLOCK_MONOTONIC, &tbf->m_bw.dl_loss_tv);
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return tbf;
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}
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gprs_rlcmac_dl_tbf::gprs_rlcmac_dl_tbf(struct gprs_rlcmac_bts *bts_, GprsMs *ms) :
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gprs_rlcmac_tbf(bts_, ms, GPRS_RLCMAC_DL_TBF),
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m_tx_counter(0),
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m_wait_confirm(0),
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m_dl_ack_requested(false),
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m_last_dl_poll_fn(-1),
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m_last_dl_drained_fn(-1),
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m_dl_gprs_ctrs(NULL),
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m_dl_egprs_ctrs(NULL)
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{
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memset(&m_llc_timer, 0, sizeof(m_llc_timer));
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osmo_timer_setup(&m_llc_timer, llc_timer_cb, this);
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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 (the_pcu->vty.llc_idle_ack_csec > 0) {
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struct timespec tv;
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csecs_to_timespec(the_pcu->vty.llc_idle_ack_csec, &tv);
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osmo_timer_schedule(&m_llc_timer, tv.tv_sec, tv.tv_nsec / 1000);
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}
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}
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int gprs_rlcmac_dl_tbf::append_data(uint16_t pdu_delay_csec,
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const uint8_t *data, uint16_t len)
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{
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struct timespec expire_time;
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LOGPTBFDL(this, LOGL_DEBUG, "appending %u bytes\n", len);
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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, &expire_time);
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memcpy(msgb_put(llc_msg, len), data, len);
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llc_queue()->enqueue(llc_msg, &expire_time);
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start_llc_timer();
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if (state_is(TBF_ST_WAIT_RELEASE)) {
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LOGPTBFDL(this, LOGL_DEBUG, "in WAIT RELEASE state (T3193), so reuse TBF\n");
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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, GprsMs *ms,
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struct gprs_rlcmac_dl_tbf **tbf)
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{
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bool ss;
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int8_t use_trx;
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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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ul_tbf = ms_ul_tbf(ms);
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/* 3GPP TS 44.060 sec 7.1.3.1 Initiation of the Packet resource request procedure:
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* "Furthermore, the mobile station shall not respond to PACKET DOWNLINK ASSIGNMENT
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* or MULTIPLE TBF DOWNLINK ASSIGNMENT messages before contention resolution is
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* completed on the mobile station side." */
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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 = false;
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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 = true; /* 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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/* FIXME: 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, ss);
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if (!dl_tbf) {
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LOGPMS(ms, DTBF, LOGL_NOTICE, "No PDCH resource\n");
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return -EBUSY;
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}
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LOGPTBFDL(dl_tbf, LOGL_DEBUG, "[DOWNLINK] START\n");
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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->trigger_ass(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 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_ms_store(bts)->get_ms(tlli, tlli_old, imsi);
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if (ms && strlen(ms_imsi(ms)) == 0) {
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ms_old = bts_ms_store(bts)->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(DTBF, LOGL_NOTICE,
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"There is a new MS object for the same MS: (0x%08x, '%s') -> (0x%08x, '%s')\n",
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ms_tlli(ms_old), ms_imsi(ms_old), ms_tlli(ms), ms_imsi(ms));
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ms_ref(ms_old);
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if (!ms_dl_tbf(ms) && ms_dl_tbf(ms_old)) {
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LOGP(DTBF, LOGL_NOTICE,
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"IMSI %s, old TBF %s: moving DL TBF to new MS object\n",
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imsi, ms_dl_tbf(ms_old)->name());
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dl_tbf = ms_dl_tbf(ms_old);
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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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ms_merge_and_clear_ms(ms, ms_old);
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ms_unref(ms_old);
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}
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}
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if (!ms)
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ms = bts_alloc_ms(bts, ms_class, egprs_ms_class);
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ms_set_imsi(ms, imsi);
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ms_confirm_tlli(ms, tlli);
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if (!ms_ms_class(ms) && ms_class) {
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ms_set_ms_class(ms, ms_class);
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}
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if (!ms_egprs_ms_class(ms) && egprs_ms_class) {
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ms_set_egprs_ms_class(ms, egprs_ms_class);
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}
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dl_tbf = ms_dl_tbf(ms);
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if (!dl_tbf) {
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rc = tbf_new_dl_assignment(bts, ms, &dl_tbf);
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if (rc < 0)
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return rc;
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}
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rc = dl_tbf->append_data(delay_csec, data, len);
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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 timespec tv_now, tv_now2;
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uint32_t octets = 0, frames = 0;
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struct timespec hyst_delta = {0, 0};
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const unsigned keep_small_thresh = 60;
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const MetaInfo *info;
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if (the_pcu->vty.llc_discard_csec)
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csecs_to_timespec(the_pcu->vty.llc_discard_csec, &hyst_delta);
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osmo_clock_gettime(CLOCK_MONOTONIC, &tv_now);
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timespecadd(&tv_now, &hyst_delta, &tv_now2);
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while ((msg = llc_queue()->dequeue(&info))) {
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const struct timespec *tv_disc = &info->expire_time;
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const struct timespec *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(ms())) {
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int bytes = llc_queue_octets(llc_queue());
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if (gprs_codel_control(ms_codel_state(ms()),
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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_do_rate_ctr_inc(bts, CTR_LLC_FRAME_TIMEDOUT);
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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_do_rate_ctr_inc(bts, CTR_LLC_FRAME_DROPPED);
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continue;
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}
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if (frames) {
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LOGPTBFDL(this, LOGL_NOTICE, "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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frames, llc_queue_size(llc_queue()));
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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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LOGPTBFDL(this, 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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LOGPTBFDL(this, LOGL_ERROR,
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"FIXME: Software error: There are no unacknowledged blocks, but V(A) != 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,
|
|
int previous_bsn, enum mcs_kind req_mcs_kind, bool *may_combine)
|
|
{
|
|
int bsn;
|
|
int data_len2, force_data_len = -1;
|
|
enum CodingScheme tx_cs;
|
|
|
|
/* Scheduler may be fine with sending any kind of data, but if
|
|
the selected TBF is GPRS-only, then let's filter out EGPRS
|
|
here */
|
|
if (!is_egprs_enabled())
|
|
req_mcs_kind = GPRS;
|
|
|
|
/* search for a nacked or resend marked bsn */
|
|
bsn = m_window.resend_needed();
|
|
|
|
if (previous_bsn >= 0) {
|
|
tx_cs = m_rlc.block(previous_bsn)->cs_current_trans;
|
|
if (!mcs_is_edge(tx_cs))
|
|
return -1;
|
|
force_data_len = m_rlc.block(previous_bsn)->len;
|
|
} else {
|
|
tx_cs = ms_current_cs_dl(ms(), req_mcs_kind);
|
|
}
|
|
|
|
if (bsn >= 0) {
|
|
/* resend an unacked bsn or resend bsn. */
|
|
if (previous_bsn == bsn)
|
|
return -1;
|
|
|
|
if (previous_bsn >= 0 &&
|
|
m_window.mod_sns(bsn - previous_bsn) > RLC_EGPRS_MAX_BSN_DELTA)
|
|
return -1;
|
|
|
|
if (is_egprs_enabled()) {
|
|
/* Table 8.1.1.2 and Table 8.1.1.1 of 44.060 */
|
|
m_rlc.block(bsn)->cs_current_trans = get_retx_mcs(m_rlc.block(bsn)->cs_init, tx_cs,
|
|
bts->pcu->vty.dl_arq_type == EGPRS_ARQ1);
|
|
|
|
LOGPTBFDL(this, LOGL_DEBUG,
|
|
"initial_cs_dl(%s) last_mcs(%s) demanded_mcs(%s) cs_trans(%s) arq_type(%d) bsn(%d)\n",
|
|
mcs_name(m_rlc.block(bsn)->cs_init),
|
|
mcs_name(m_rlc.block(bsn)->cs_last),
|
|
mcs_name(tx_cs),
|
|
mcs_name(m_rlc.block(bsn)->cs_current_trans),
|
|
the_pcu->vty.dl_arq_type, bsn);
|
|
|
|
/* TODO: Need to remove this check when MCS-8 -> MCS-6
|
|
* transistion is handled.
|
|
* Refer commit be881c028fc4da00c4046ecd9296727975c206a3
|
|
*/
|
|
if (m_rlc.block(bsn)->cs_init == MCS8)
|
|
m_rlc.block(bsn)->cs_current_trans =
|
|
MCS8;
|
|
} else {
|
|
/* gprs */
|
|
m_rlc.block(bsn)->cs_current_trans =
|
|
m_rlc.block(bsn)->cs_last;
|
|
}
|
|
|
|
data_len2 = m_rlc.block(bsn)->len;
|
|
if (force_data_len > 0 && force_data_len != data_len2)
|
|
return -1;
|
|
LOGPTBFDL(this, LOGL_DEBUG, "Resending BSN %d\n", bsn);
|
|
/* re-send block with negative aknowlegement */
|
|
m_window.m_v_b.mark_unacked(bsn);
|
|
bts_do_rate_ctr_inc(bts, CTR_RLC_RESENT);
|
|
} else if (state_is(TBF_ST_FINISHED)) {
|
|
/* If the TBF is in finished, we already sent all packages at least once.
|
|
* If any packages could have been sent (because of unacked) it should have
|
|
* been catched up by the upper if(bsn >= 0) */
|
|
LOGPTBFDL(this, LOGL_DEBUG,
|
|
"Restarting at BSN %d, because all blocks have been transmitted.\n",
|
|
m_window.v_a());
|
|
bts_do_rate_ctr_inc(bts, CTR_RLC_RESTARTED);
|
|
if (restart_bsn_cycle())
|
|
return take_next_bsn(fn, previous_bsn, req_mcs_kind, may_combine);
|
|
} else if (dl_window_stalled()) {
|
|
/* There are no more packages to send, but the window is stalled.
|
|
* Restart the bsn_cycle to resend all unacked messages */
|
|
LOGPTBFDL(this, LOGL_NOTICE,
|
|
"Restarting at BSN %d, because the window is stalled.\n",
|
|
m_window.v_a());
|
|
bts_do_rate_ctr_inc(bts, CTR_RLC_STALLED);
|
|
if (restart_bsn_cycle())
|
|
return take_next_bsn(fn, previous_bsn, req_mcs_kind, may_combine);
|
|
} else if (have_data()) {
|
|
/* The window has space left, generate new bsn */
|
|
LOGPTBFDL(this, LOGL_DEBUG,
|
|
"Sending new block at BSN %d, CS=%s%s\n",
|
|
m_window.v_s(), mcs_name(tx_cs),
|
|
force_data_len != -1 ? " (forced)" : "");
|
|
|
|
bsn = create_new_bsn(fn, tx_cs);
|
|
} else if (bts->pcu->vty.dl_tbf_preemptive_retransmission && !m_window.window_empty()) {
|
|
/* The window contains unacked packages, but not acked.
|
|
* Mark unacked bsns as RESEND */
|
|
LOGPTBFDL(this, LOGL_DEBUG,
|
|
"Restarting at BSN %d, because all blocks have been transmitted (FLOW).\n",
|
|
m_window.v_a());
|
|
bts_do_rate_ctr_inc(bts, CTR_RLC_RESTARTED);
|
|
if (restart_bsn_cycle())
|
|
return take_next_bsn(fn, previous_bsn, req_mcs_kind, may_combine);
|
|
} else {
|
|
/* Nothing left to send, create dummy LLC commands */
|
|
LOGPTBFDL(this, LOGL_DEBUG,
|
|
"Sending new dummy block at BSN %d, CS=%s\n",
|
|
m_window.v_s(), mcs_name(tx_cs));
|
|
bsn = create_new_bsn(fn, tx_cs);
|
|
/* Don't send a second block, so don't set cs_current_trans */
|
|
}
|
|
|
|
if (bsn < 0) {
|
|
/* we just send final block again */
|
|
LOGPTBFDL(this, LOGL_DEBUG,
|
|
"Nothing else to send, Re-transmit final block!\n");
|
|
bsn = m_window.v_s_mod(-1);
|
|
bts_do_rate_ctr_inc(bts, CTR_RLC_FINAL_BLOCK_RESENT);
|
|
bts_do_rate_ctr_inc(bts, CTR_RLC_RESENT);
|
|
}
|
|
|
|
*may_combine = num_data_blocks(mcs_header_type(m_rlc.block(bsn)->cs_current_trans)) > 1;
|
|
|
|
return bsn;
|
|
}
|
|
|
|
/*
|
|
* Create DL data block
|
|
* The messages are fragmented and forwarded as data blocks.
|
|
*/
|
|
struct msgb *gprs_rlcmac_dl_tbf::create_dl_acked_block(uint32_t fn, uint8_t ts, enum mcs_kind req_mcs_kind)
|
|
{
|
|
int bsn, bsn2 = -1;
|
|
bool may_combine;
|
|
|
|
LOGPTBFDL(this, LOGL_DEBUG, "downlink (V(A)==%d .. V(S)==%d) mcs_mode_restrict=%s\n",
|
|
m_window.v_a(), m_window.v_s(), mode_name(req_mcs_kind));
|
|
|
|
bsn = take_next_bsn(fn, -1, req_mcs_kind, &may_combine);
|
|
if (bsn < 0)
|
|
return NULL;
|
|
|
|
if (may_combine)
|
|
bsn2 = take_next_bsn(fn, bsn, req_mcs_kind, &may_combine);
|
|
|
|
return create_dl_acked_block(fn, ts, bsn, bsn2);
|
|
}
|
|
|
|
/* depending on the current TBF, we assign on PACCH or AGCH */
|
|
void gprs_rlcmac_dl_tbf::trigger_ass(struct gprs_rlcmac_tbf *old_tbf)
|
|
{
|
|
uint16_t pgroup;
|
|
/* stop pending timer */
|
|
stop_timers("assignment (DL-TBF)");
|
|
|
|
/* check for downlink tbf: */
|
|
if (old_tbf) {
|
|
LOGPTBFDL(this, LOGL_DEBUG, "Send dowlink assignment on PACCH, because %s exists\n", old_tbf->name());
|
|
TBF_SET_ASS_STATE_DL(old_tbf, GPRS_RLCMAC_DL_ASS_SEND_ASS);
|
|
old_tbf->was_releasing = old_tbf->state_is(TBF_ST_WAIT_RELEASE);
|
|
|
|
/* change state */
|
|
osmo_fsm_inst_dispatch(this->state_fsm.fi, TBF_EV_ASSIGN_ADD_PACCH, NULL);
|
|
|
|
/* Start timer, expiry in gprs_rlcmac_tbf::handle_timeout tbf_free()s the TBF */
|
|
T_START(this, T0, -2001, "assignment (PACCH)", true);
|
|
} else {
|
|
LOGPTBFDL(this, LOGL_DEBUG, "Send dowlink assignment on PCH, no TBF exist (IMSI=%s)\n",
|
|
imsi());
|
|
was_releasing = state_is(TBF_ST_WAIT_RELEASE);
|
|
|
|
/* change state */
|
|
osmo_fsm_inst_dispatch(this->state_fsm.fi, TBF_EV_ASSIGN_ADD_CCCH, NULL);
|
|
|
|
/* send immediate assignment */
|
|
if ((pgroup = imsi2paging_group(imsi())) > 999)
|
|
LOGPTBFDL(this, LOGL_ERROR, "IMSI to paging group failed! (%s)\n", imsi());
|
|
bts_snd_dl_ass(bts, this, pgroup);
|
|
m_wait_confirm = 1;
|
|
}
|
|
}
|
|
|
|
void gprs_rlcmac_dl_tbf::schedule_next_frame()
|
|
{
|
|
struct msgb *msg;
|
|
|
|
if (llc_frame_length(&m_llc) != 0)
|
|
return;
|
|
|
|
/* dequeue next LLC frame, if any */
|
|
msg = llc_dequeue(bts->pcu->bssgp.bctx);
|
|
if (!msg)
|
|
return;
|
|
|
|
LOGPTBFDL(this, LOGL_DEBUG, "Dequeue next LLC (len=%d)\n", msg->len);
|
|
|
|
m_llc.put_frame(msg->data, msg->len);
|
|
bts_do_rate_ctr_inc(bts, CTR_LLC_FRAME_SCHED);
|
|
msgb_free(msg);
|
|
m_last_dl_drained_fn = -1;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::create_new_bsn(const uint32_t fn, enum CodingScheme 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 (llc_frame_length(&m_llc) == 0)
|
|
schedule_next_frame();
|
|
|
|
OSMO_ASSERT(mcs_is_valid(cs));
|
|
|
|
/* length of usable data block (single data unit w/o header) */
|
|
const uint8_t block_data_len = mcs_max_data_block_bytes(cs);
|
|
|
|
/* now we still have untransmitted LLC data, so we fill mac block */
|
|
rlc_data = m_rlc.block(bsn);
|
|
data = prepare(rlc_data, block_data_len);
|
|
rlc_data->cs_last = cs;
|
|
rlc_data->cs_current_trans = cs;
|
|
|
|
/* Initialise the variable related to DL SPB */
|
|
rlc_data->spb_status.block_status_dl = EGPRS_RESEG_DL_DEFAULT;
|
|
rlc_data->cs_init = 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;
|
|
int payload_written = 0;
|
|
|
|
if (llc_frame_length(&m_llc) == 0) {
|
|
/* 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();
|
|
|
|
int space = block_data_len - write_offset;
|
|
|
|
if (num_chunks != 0) {
|
|
/* Nothing to send, and we already put some data in
|
|
* rlcmac data block, we are done */
|
|
LOGPTBFDL(this, LOGL_DEBUG,
|
|
"LLC queue completely drained and there's "
|
|
"still %d free bytes in rlcmac data block\n", space);
|
|
|
|
/* We may need to update fbi in header here
|
|
* since m_last_dl_drained_fn was updated above
|
|
* Specially important when X2031 is 0. */
|
|
is_final = llc_queue_size(llc_queue()) == 0 && !keep_open(fn);
|
|
if (is_final) {
|
|
rdbi->cv = 0;
|
|
osmo_fsm_inst_dispatch(this->state_fsm.fi, TBF_EV_LAST_DL_DATA_SENT, NULL);
|
|
}
|
|
|
|
if (mcs_is_edge(cs)) {
|
|
/* in EGPRS there's no M bit, so we need
|
|
* to flag padding with LI=127 */
|
|
Encoding::rlc_data_to_dl_append_egprs_li_padding(rdbi,
|
|
&write_offset,
|
|
&num_chunks,
|
|
data);
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Nothing to send from upper layers (LLC), but still
|
|
* requested to send something to MS to delay the
|
|
* release of the TBF. See 3GPP TS 44.060 9.3.1a
|
|
* "Delayed release of downlink Temporary Block Flow" */
|
|
/* A header will need to by added, so we just need
|
|
* space-1 octets */
|
|
m_llc.put_dummy_frame(space - 1);
|
|
|
|
LOGPTBFDL(this, LOGL_DEBUG,
|
|
"Empty chunk, added LLC dummy command of size %d, drained_since=%d\n",
|
|
llc_frame_length(&m_llc), frames_since_last_drain(fn));
|
|
}
|
|
|
|
is_final = llc_queue_size(llc_queue()) == 0 && !keep_open(fn);
|
|
|
|
ar = Encoding::rlc_data_to_dl_append(rdbi, cs,
|
|
&m_llc, &write_offset, &num_chunks, data, is_final, &payload_written);
|
|
|
|
if (payload_written > 0)
|
|
bts_do_rate_ctr_add(bts, CTR_RLC_DL_PAYLOAD_BYTES, payload_written);
|
|
|
|
if (ar == Encoding::AR_NEED_MORE_BLOCKS)
|
|
break;
|
|
|
|
LOGPTBFDL(this, LOGL_DEBUG, "Complete DL frame, len=%d\n", llc_frame_length(&m_llc));
|
|
gprs_rlcmac_dl_bw(this, llc_frame_length(&m_llc));
|
|
bts_do_rate_ctr_add(bts, CTR_LLC_DL_BYTES, llc_frame_length(&m_llc));
|
|
m_llc.reset();
|
|
|
|
if (is_final) {
|
|
request_dl_ack();
|
|
osmo_fsm_inst_dispatch(this->state_fsm.fi, TBF_EV_LAST_DL_DATA_SENT, NULL);
|
|
}
|
|
|
|
/* dequeue next LLC frame, if any */
|
|
schedule_next_frame();
|
|
} while (ar == Encoding::AR_COMPLETED_SPACE_LEFT);
|
|
|
|
LOGPTBFDL(this, LOGL_DEBUG, "data block (BSN %d, %s): %s\n",
|
|
bsn, mcs_name(rlc_data->cs_last),
|
|
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;
|
|
}
|
|
|
|
bool gprs_rlcmac_dl_tbf::handle_ack_nack()
|
|
{
|
|
bool ack_recovered = false;
|
|
|
|
state_fsm.state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK);
|
|
if (check_n_clear(GPRS_RLCMAC_FLAG_TO_DL_ACK)) {
|
|
ack_recovered = true;
|
|
}
|
|
|
|
/* reset N3105 */
|
|
n_reset(N3105);
|
|
t_stop(T3191, "ACK/NACK received");
|
|
|
|
return ack_recovered;
|
|
}
|
|
|
|
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 */
|
|
uint8_t data_block_idx = 0;
|
|
unsigned int rrbp;
|
|
uint32_t new_poll_fn;
|
|
int rc;
|
|
bool is_final = false;
|
|
gprs_rlc_data_info rlc;
|
|
enum CodingScheme cs;
|
|
int bsns[ARRAY_SIZE(rlc.block_info)];
|
|
unsigned num_bsns;
|
|
bool need_padding = false;
|
|
enum egprs_rlcmac_dl_spb spb = EGPRS_RLCMAC_DL_NO_RETX;
|
|
unsigned int spb_status = get_egprs_dl_spb_status(index);
|
|
|
|
enum egprs_puncturing_values punct[2] = {
|
|
EGPRS_PS_INVALID, EGPRS_PS_INVALID
|
|
};
|
|
osmo_static_assert(ARRAY_SIZE(rlc.block_info) == 2,
|
|
rlc_block_info_size_is_two);
|
|
|
|
/*
|
|
* 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_current_trans;
|
|
enum CodingScheme cs_init = m_rlc.block(index)->cs_init;
|
|
bsns[0] = index;
|
|
num_bsns = 1;
|
|
|
|
if (index2 >= 0) {
|
|
bsns[num_bsns] = index2;
|
|
num_bsns += 1;
|
|
}
|
|
|
|
update_coding_scheme_counter_dl(cs);
|
|
/*
|
|
* if the intial mcs is 8 and retransmission mcs is either 6 or 3
|
|
* we have to include the padding of 6 octets in first segment
|
|
*/
|
|
if ((cs_init == MCS8) &&
|
|
(cs == MCS6 || cs == MCS3)) {
|
|
if (spb_status == EGPRS_RESEG_DL_DEFAULT ||
|
|
spb_status == EGPRS_RESEG_SECOND_SEG_SENT)
|
|
need_padding = true;
|
|
} else if (num_bsns == 1) {
|
|
/* TODO: remove the conditional when MCS-6 padding isn't
|
|
* failing to be decoded by MEs anymore */
|
|
/* TODO: support of MCS-8 -> MCS-6 transition should be
|
|
* handled
|
|
* Refer commit be881c028fc4da00c4046ecd9296727975c206a3
|
|
* dated 2016-02-07 23:45:40 (UTC)
|
|
*/
|
|
if (cs != MCS8)
|
|
mcs_dec_to_single_block(&cs, &need_padding);
|
|
}
|
|
|
|
spb = get_egprs_dl_spb(index);
|
|
|
|
LOGPTBFDL(this, LOGL_DEBUG, "need_padding %d spb_status %d spb %d (BSN1 %d BSN2 %d)\n",
|
|
need_padding, spb_status, spb, index, index2);
|
|
|
|
gprs_rlc_data_info_init_dl(&rlc, cs, need_padding, spb);
|
|
|
|
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 = mcs_size_dl(cs);
|
|
dl_msg = msgb_alloc(msg_len, "rlcmac_dl_data");
|
|
if (!dl_msg)
|
|
return NULL;
|
|
|
|
msg_data = msgb_put(dl_msg, msg_len);
|
|
|
|
OSMO_ASSERT(rlc.num_data_blocks <= ARRAY_SIZE(rlc.block_info));
|
|
OSMO_ASSERT(rlc.num_data_blocks > 0);
|
|
|
|
LOGPTBFDL(this, LOGL_DEBUG, "Copying %u RLC blocks, %u BSNs\n", rlc.num_data_blocks, num_bsns);
|
|
|
|
/* Copy block(s) to RLC message: the num_data_blocks cannot be more than 2 - see assert above */
|
|
for (data_block_idx = 0; data_block_idx < OSMO_MIN(rlc.num_data_blocks, 2);
|
|
data_block_idx++)
|
|
{
|
|
int bsn;
|
|
uint8_t *block_data;
|
|
gprs_rlc_data_block_info *rdbi, *block_info;
|
|
enum egprs_rlc_dl_reseg_bsn_state reseg_status;
|
|
|
|
/* Check if there are more blocks than BSNs */
|
|
if (data_block_idx < num_bsns)
|
|
bsn = bsns[data_block_idx];
|
|
else
|
|
bsn = bsns[0];
|
|
|
|
/* Get current puncturing scheme from block */
|
|
|
|
m_rlc.block(bsn)->next_ps = gprs_get_punct_scheme(
|
|
m_rlc.block(bsn)->next_ps,
|
|
m_rlc.block(bsn)->cs_last, cs, spb);
|
|
|
|
if (mcs_is_edge(cs)) {
|
|
OSMO_ASSERT(m_rlc.block(bsn)->next_ps >= EGPRS_PS_1);
|
|
OSMO_ASSERT(m_rlc.block(bsn)->next_ps <= EGPRS_PS_3);
|
|
}
|
|
|
|
punct[data_block_idx] = m_rlc.block(bsn)->next_ps;
|
|
|
|
rdbi = &rlc.block_info[data_block_idx];
|
|
block_info = &m_rlc.block(bsn)->block_info;
|
|
|
|
/*
|
|
* get data and header from current block
|
|
* function returns the reseg status
|
|
*/
|
|
reseg_status = egprs_dl_get_data(bsn, &block_data);
|
|
m_rlc.block(bsn)->spb_status.block_status_dl = reseg_status;
|
|
|
|
/*
|
|
* If it is first segment of the split block set the state of
|
|
* bsn to nacked. If it is the first segment dont update the
|
|
* next ps value of bsn. since next segment also needs same cps
|
|
*/
|
|
if (spb == EGPRS_RLCMAC_DL_FIRST_SEG)
|
|
m_window.m_v_b.mark_nacked(bsn);
|
|
else {
|
|
/*
|
|
* TODO: Need to handle 2 same bsns
|
|
* in header type 1
|
|
*/
|
|
gprs_update_punct_scheme(&m_rlc.block(bsn)->next_ps,
|
|
cs);
|
|
}
|
|
|
|
m_rlc.block(bsn)->cs_last = cs;
|
|
rdbi->e = block_info->e;
|
|
rdbi->cv = block_info->cv;
|
|
rdbi->bsn = bsn;
|
|
is_final = is_final || rdbi->cv == 0;
|
|
|
|
LOGPTBFDL(this, 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);
|
|
}
|
|
|
|
/* Calculate CPS only for EGPRS case */
|
|
if (mcs_is_edge(cs))
|
|
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_fsm.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) {
|
|
LOGPTBFDL(this, LOGL_DEBUG,
|
|
"Scheduling Ack/Nack polling, because it was requested explicitly "
|
|
"(e.g. first final block sent).\n");
|
|
} else if (need_poll) {
|
|
LOGPTBFDL(this, LOGL_DEBUG,
|
|
"Scheduling Ack/Nack polling, because polling timed out.\n");
|
|
} else {
|
|
LOGPTBFDL(this, 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, PDCH_ULC_POLL_DL_ACK);
|
|
|
|
m_tx_counter = 0;
|
|
/* start timer whenever we send the final block */
|
|
if (is_final)
|
|
T_START(this, T3191, 3191, "final block (DL-TBF)", true);
|
|
|
|
state_fsm.state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK); /* clear poll timeout flag */
|
|
|
|
/* 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 = new_poll_fn;
|
|
|
|
LOGPTBFDL(this, LOGL_INFO,
|
|
"Scheduled Ack/Nack polling on FN=%d, TS=%d\n",
|
|
new_poll_fn, ts);
|
|
}
|
|
}
|
|
|
|
Encoding::rlc_write_dl_data_header(&rlc, msg_data);
|
|
|
|
LOGPTBFDL(this, LOGL_DEBUG, "msg block (BSN %d, %s%s): %s\n",
|
|
index, mcs_name(cs),
|
|
need_padding ? ", padded" : "",
|
|
msgb_hexdump(dl_msg));
|
|
|
|
/* Increment TX-counter */
|
|
m_tx_counter++;
|
|
|
|
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);
|
|
|
|
unsigned distance = m_window.distance();
|
|
|
|
num_blocks = num_blocks > distance
|
|
? distance : num_blocks;
|
|
|
|
/* 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_last != 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;
|
|
}
|
|
}
|
|
|
|
LOGPTBFDL(this, LOGL_DEBUG,
|
|
"DL analysis, range=%d:%d, lost=%d, recv=%d, skipped=%d, bsn=%d, info='%s'\n",
|
|
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);
|
|
}
|
|
|
|
gprs_rlc_window *gprs_rlcmac_dl_tbf::window()
|
|
{
|
|
return &m_window;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::update_window(unsigned first_bsn,
|
|
const struct bitvec *rbb)
|
|
{
|
|
unsigned dist;
|
|
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;
|
|
dist = m_window.distance();
|
|
unsigned num_blocks = rbb->cur_bit > dist
|
|
? dist : 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 */
|
|
LOGPTBFDL(this, 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));
|
|
|
|
error_rate = analyse_errors(show_rbb, behind_last_bsn, &ana_res);
|
|
|
|
if (the_pcu->vty.cs_adj_enabled && ms())
|
|
ms_update_error_rate(ms(), this, error_rate);
|
|
|
|
m_window.update(bts, rbb, first_bsn, &lost, &received);
|
|
rate_ctr_add(rate_ctr_group_get_ctr(m_ctrs, TBF_CTR_RLC_NACKED), lost);
|
|
|
|
/* 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);
|
|
LOGPTBFDL(this, 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) */
|
|
LOGPTBFDL(this, 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!*/
|
|
LOGPTBFDL(this, LOGL_NOTICE, "ack range is out of V(A)..V(S) range - Free TBF!\n");
|
|
return 1; /* indicate to free TBF */
|
|
}
|
|
|
|
error_rate = analyse_errors(show_rbb, ssn, &ana_res);
|
|
|
|
if (the_pcu->vty.cs_adj_enabled && ms())
|
|
ms_update_error_rate(ms(), this, error_rate);
|
|
|
|
m_window.update(bts, show_rbb, ssn,
|
|
&lost, &received);
|
|
rate_ctr_add(rate_ctr_group_get_ctr(m_ctrs, TBF_CTR_RLC_NACKED), lost);
|
|
|
|
/* 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);
|
|
LOGPTBFDL(this, 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(TBF_ST_FINISHED) && m_window.window_empty()) {
|
|
LOGPTBFDL(this, LOGL_NOTICE,
|
|
"Received acknowledge of all blocks, but without final ack inidcation (don't worry)\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
int gprs_rlcmac_dl_tbf::rcvd_dl_final_ack()
|
|
{
|
|
osmo_fsm_inst_dispatch(this->state_fsm.fi, TBF_EV_FINAL_ACK_RECVD, NULL);
|
|
release();
|
|
|
|
/* check for LLC PDU in the LLC Queue */
|
|
if (llc_queue_size(llc_queue()) > 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);
|
|
|
|
/* start T3193 */
|
|
T_START(this, T3193, 3193, "release (DL-TBF)", true);
|
|
|
|
/* reset rlc states */
|
|
m_tx_counter = 0;
|
|
m_wait_confirm = 0;
|
|
m_window.reset();
|
|
|
|
osmo_fsm_inst_dispatch(this->state_fsm.fi, TBF_EV_ASSIGN_DEL_CCCH, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::abort()
|
|
{
|
|
uint16_t lost;
|
|
|
|
if (state_is(TBF_ST_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) */
|
|
}
|
|
|
|
/* This state change looks unneeded and can probably be dropped at some point: */
|
|
tbf_fsm_state_chg(this->state_fsm.fi, TBF_ST_RELEASING);
|
|
|
|
/* reset rlc states */
|
|
m_window.reset();
|
|
|
|
osmo_fsm_inst_dispatch(this->state_fsm.fi, TBF_EV_ASSIGN_DEL_CCCH, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::rcvd_dl_ack(bool final_ack, unsigned first_bsn,
|
|
struct bitvec *rbb)
|
|
{
|
|
int rc;
|
|
LOGPTBFDL(this, LOGL_DEBUG, "downlink acknowledge\n");
|
|
|
|
rc = update_window(first_bsn, rbb);
|
|
|
|
if (final_ack) {
|
|
LOGPTBFDL(this, LOGL_DEBUG, "Final ACK received.\n");
|
|
rc = rcvd_dl_final_ack();
|
|
} else if (state_is(TBF_ST_FINISHED) && m_window.window_empty()) {
|
|
LOGPTBFDL(this, 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(bool final_ack, uint8_t ssn, uint8_t *rbb)
|
|
{
|
|
LOGPTBFDL(this, LOGL_DEBUG, "downlink acknowledge\n");
|
|
|
|
if (!final_ack)
|
|
return update_window(ssn, rbb);
|
|
|
|
LOGPTBFDL(this, LOGL_DEBUG, "Final ACK received.\n");
|
|
return rcvd_dl_final_ack();
|
|
}
|
|
|
|
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
|
|
{
|
|
return state_fsm.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 llc_chunk_size(&m_llc) > 0 ||
|
|
(llc_queue_size(llc_queue()) > 0);
|
|
}
|
|
|
|
static inline int frames_since_last(int32_t last, unsigned fn)
|
|
{
|
|
unsigned wrapped = (fn + GSM_MAX_FN - last) % GSM_MAX_FN;
|
|
|
|
if (last < 0)
|
|
return -1;
|
|
|
|
if (wrapped < GSM_MAX_FN/2)
|
|
return wrapped;
|
|
|
|
return wrapped - GSM_MAX_FN;
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::frames_since_last_poll(unsigned fn) const
|
|
{
|
|
return frames_since_last(m_last_dl_poll_fn, fn);
|
|
}
|
|
|
|
int gprs_rlcmac_dl_tbf::frames_since_last_drain(unsigned fn) const
|
|
{
|
|
return frames_since_last(m_last_dl_drained_fn, fn);
|
|
}
|
|
|
|
bool gprs_rlcmac_dl_tbf::keep_open(unsigned fn) const
|
|
{
|
|
int keep_time_frames;
|
|
unsigned long dl_tbf_idle_msec;
|
|
int since_last_drain;
|
|
bool keep;
|
|
|
|
dl_tbf_idle_msec = osmo_tdef_get(the_pcu->T_defs, -2031, OSMO_TDEF_MS, -1);
|
|
if (dl_tbf_idle_msec == 0)
|
|
return false;
|
|
|
|
keep_time_frames = msecs_to_frames(dl_tbf_idle_msec);
|
|
since_last_drain = frames_since_last_drain(fn);
|
|
keep = since_last_drain <= keep_time_frames;
|
|
|
|
if (since_last_drain >= 0)
|
|
LOGPTBFDL(this, LOGL_DEBUG, "Keep idle TBF open: %d/%d -> %s\n",
|
|
since_last_drain, keep_time_frames, keep ? "yes" : "no");
|
|
return keep;
|
|
}
|
|
|
|
/*
|
|
* This function returns the pointer to data which needs
|
|
* to be copied. Also updates the status of the block related to
|
|
* Split block handling in the RLC/MAC block.
|
|
*/
|
|
enum egprs_rlc_dl_reseg_bsn_state
|
|
gprs_rlcmac_dl_tbf::egprs_dl_get_data(int bsn, uint8_t **block_data)
|
|
{
|
|
gprs_rlc_data *rlc_data = m_rlc.block(bsn);
|
|
egprs_rlc_dl_reseg_bsn_state *block_status_dl =
|
|
&rlc_data->spb_status.block_status_dl;
|
|
|
|
enum CodingScheme cs_init = rlc_data->cs_init;
|
|
enum CodingScheme cs_current_trans = rlc_data->cs_current_trans;
|
|
|
|
enum HeaderType ht_cs_init = mcs_header_type(rlc_data->cs_init);
|
|
enum HeaderType ht_cs_current_trans = mcs_header_type(rlc_data->cs_current_trans);
|
|
|
|
*block_data = &rlc_data->block[0];
|
|
|
|
/*
|
|
* Table 10.3a.0.1 of 44.060
|
|
* MCS6,9: second segment starts at 74/2 = 37
|
|
* MCS5,7: second segment starts at 56/2 = 28
|
|
* MCS8: second segment starts at 31
|
|
* MCS4: second segment starts at 44/2 = 22
|
|
*/
|
|
if (ht_cs_current_trans == HEADER_EGPRS_DATA_TYPE_3) {
|
|
if (*block_status_dl == EGPRS_RESEG_FIRST_SEG_SENT) {
|
|
switch (cs_init) {
|
|
case MCS6 :
|
|
case MCS9 :
|
|
*block_data = &rlc_data->block[37];
|
|
break;
|
|
case MCS7 :
|
|
case MCS5 :
|
|
*block_data = &rlc_data->block[28];
|
|
break;
|
|
case MCS8 :
|
|
*block_data = &rlc_data->block[31];
|
|
break;
|
|
case MCS4 :
|
|
*block_data = &rlc_data->block[22];
|
|
break;
|
|
default:
|
|
LOGPTBFDL(this, LOGL_ERROR,
|
|
"FIXME: Software error: hit invalid condition. "
|
|
"headerType(%d) blockstatus(%d) cs(%s) PLEASE FIX!\n",
|
|
ht_cs_current_trans,
|
|
*block_status_dl, mcs_name(cs_init));
|
|
break;
|
|
|
|
}
|
|
return EGPRS_RESEG_SECOND_SEG_SENT;
|
|
} else if ((ht_cs_init == HEADER_EGPRS_DATA_TYPE_1) ||
|
|
(ht_cs_init == HEADER_EGPRS_DATA_TYPE_2)) {
|
|
return EGPRS_RESEG_FIRST_SEG_SENT;
|
|
} else if ((cs_init == MCS4) &&
|
|
(cs_current_trans == MCS1)) {
|
|
return EGPRS_RESEG_FIRST_SEG_SENT;
|
|
}
|
|
}
|
|
return EGPRS_RESEG_DL_DEFAULT;
|
|
}
|
|
|
|
/*
|
|
* This function returns the status of split block
|
|
* for RLC/MAC block.
|
|
*/
|
|
unsigned int gprs_rlcmac_dl_tbf::get_egprs_dl_spb_status(const int bsn)
|
|
{
|
|
const gprs_rlc_data *rlc_data = m_rlc.block(bsn);
|
|
|
|
return rlc_data->spb_status.block_status_dl;
|
|
}
|
|
|
|
/*
|
|
* This function returns the spb value to be sent OTA
|
|
* for RLC/MAC block.
|
|
*/
|
|
enum egprs_rlcmac_dl_spb gprs_rlcmac_dl_tbf::get_egprs_dl_spb(const int bsn)
|
|
{
|
|
struct gprs_rlc_data *rlc_data = m_rlc.block(bsn);
|
|
egprs_rlc_dl_reseg_bsn_state block_status_dl = rlc_data->spb_status.block_status_dl;
|
|
|
|
enum CodingScheme cs_init = rlc_data->cs_init;
|
|
enum CodingScheme cs_current_trans = rlc_data->cs_current_trans;
|
|
|
|
enum HeaderType ht_cs_init = mcs_header_type(rlc_data->cs_init);
|
|
enum HeaderType ht_cs_current_trans = mcs_header_type(rlc_data->cs_current_trans);
|
|
|
|
/* Table 10.4.8b.1 of 44.060 */
|
|
if (ht_cs_current_trans == HEADER_EGPRS_DATA_TYPE_3) {
|
|
/*
|
|
* if we are sending the second segment the spb should be 3
|
|
* otherwise it should be 2
|
|
*/
|
|
if (block_status_dl == EGPRS_RESEG_FIRST_SEG_SENT) {
|
|
/* statistics */
|
|
bts_do_rate_ctr_inc(bts, CTR_SPB_DL_SECOND_SEGMENT);
|
|
return EGPRS_RLCMAC_DL_SEC_SEG;
|
|
} else if ((ht_cs_init == HEADER_EGPRS_DATA_TYPE_1) ||
|
|
(ht_cs_init == HEADER_EGPRS_DATA_TYPE_2)) {
|
|
bts_do_rate_ctr_inc(bts, CTR_SPB_DL_FIRST_SEGMENT);
|
|
return EGPRS_RLCMAC_DL_FIRST_SEG;
|
|
} else if ((cs_init == MCS4) &&
|
|
(cs_current_trans == MCS1)) {
|
|
bts_do_rate_ctr_inc(bts, CTR_SPB_DL_FIRST_SEGMENT);
|
|
return EGPRS_RLCMAC_DL_FIRST_SEG;
|
|
}
|
|
}
|
|
/* Non SPB cases 0 is reurned */
|
|
return EGPRS_RLCMAC_DL_NO_RETX;
|
|
}
|
|
|
|
void gprs_rlcmac_dl_tbf::set_window_size()
|
|
{
|
|
const struct gprs_rlcmac_bts *b = bts;
|
|
uint16_t ws = egprs_window_size(b, dl_slots());
|
|
|
|
LOGPTBFDL(this, LOGL_INFO, "setting EGPRS DL window size to %u, base(%u) slots(%u) ws_pdch(%u)\n",
|
|
ws, bts->pcu->vty.ws_base, pcu_bitcount(dl_slots()), bts->pcu->vty.ws_pdch);
|
|
m_window.set_ws(ws);
|
|
}
|
|
|
|
void gprs_rlcmac_dl_tbf::update_coding_scheme_counter_dl(enum CodingScheme cs)
|
|
{
|
|
switch (cs) {
|
|
case CS1:
|
|
bts_do_rate_ctr_inc(bts, CTR_GPRS_DL_CS1);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_gprs_ctrs, TBF_CTR_GPRS_DL_CS1));
|
|
break;
|
|
case CS2:
|
|
bts_do_rate_ctr_inc(bts, CTR_GPRS_DL_CS2);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_gprs_ctrs, TBF_CTR_GPRS_DL_CS2));
|
|
break;
|
|
case CS3:
|
|
bts_do_rate_ctr_inc(bts, CTR_GPRS_DL_CS3);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_gprs_ctrs, TBF_CTR_GPRS_DL_CS3));
|
|
break;
|
|
case CS4:
|
|
bts_do_rate_ctr_inc(bts, CTR_GPRS_DL_CS4);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_gprs_ctrs, TBF_CTR_GPRS_DL_CS4));
|
|
break;
|
|
case MCS1:
|
|
bts_do_rate_ctr_inc(bts, CTR_EGPRS_DL_MCS1);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_egprs_ctrs, TBF_CTR_EGPRS_DL_MCS1));
|
|
break;
|
|
case MCS2:
|
|
bts_do_rate_ctr_inc(bts, CTR_EGPRS_DL_MCS2);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_egprs_ctrs, TBF_CTR_EGPRS_DL_MCS2));
|
|
break;
|
|
case MCS3:
|
|
bts_do_rate_ctr_inc(bts, CTR_EGPRS_DL_MCS3);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_egprs_ctrs, TBF_CTR_EGPRS_DL_MCS3));
|
|
break;
|
|
case MCS4:
|
|
bts_do_rate_ctr_inc(bts, CTR_EGPRS_DL_MCS4);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_egprs_ctrs, TBF_CTR_EGPRS_DL_MCS4));
|
|
break;
|
|
case MCS5:
|
|
bts_do_rate_ctr_inc(bts, CTR_EGPRS_DL_MCS5);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_egprs_ctrs, TBF_CTR_EGPRS_DL_MCS5));
|
|
break;
|
|
case MCS6:
|
|
bts_do_rate_ctr_inc(bts, CTR_EGPRS_DL_MCS6);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_egprs_ctrs, TBF_CTR_EGPRS_DL_MCS6));
|
|
break;
|
|
case MCS7:
|
|
bts_do_rate_ctr_inc(bts, CTR_EGPRS_DL_MCS7);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_egprs_ctrs, TBF_CTR_EGPRS_DL_MCS7));
|
|
break;
|
|
case MCS8:
|
|
bts_do_rate_ctr_inc(bts, CTR_EGPRS_DL_MCS8);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_egprs_ctrs, TBF_CTR_EGPRS_DL_MCS8));
|
|
break;
|
|
case MCS9:
|
|
bts_do_rate_ctr_inc(bts, CTR_EGPRS_DL_MCS9);
|
|
rate_ctr_inc(rate_ctr_group_get_ctr(m_dl_egprs_ctrs, TBF_CTR_EGPRS_DL_MCS9));
|
|
break;
|
|
default:
|
|
LOGPTBFDL(this, LOGL_ERROR, "attempting to update rate counters for unsupported (M)CS %s\n",
|
|
mcs_name(cs));
|
|
}
|
|
}
|
|
|
|
struct gprs_rlcmac_dl_tbf *as_dl_tbf(struct gprs_rlcmac_tbf *tbf)
|
|
{
|
|
if (tbf && tbf->direction == GPRS_RLCMAC_DL_TBF)
|
|
return static_cast<gprs_rlcmac_dl_tbf *>(tbf);
|
|
else
|
|
return NULL;
|
|
}
|