254 lines
7.1 KiB
C++
254 lines
7.1 KiB
C++
/* Copied from gprs_bssgp_pcu.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 <tbf.h>
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#include <gprs_rlcmac.h>
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#include <gprs_debug.h>
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extern "C" {
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#include <osmocom/core/msgb.h>
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}
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#include <errno.h>
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#include <string.h>
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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->ms_class = ms_class;
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}
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static inline void tbf_assign_imsi(struct gprs_rlcmac_tbf *tbf,
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const char *imsi)
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{
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strncpy(tbf->meas.imsi, imsi, sizeof(tbf->meas.imsi) - 1);
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}
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static struct gprs_rlcmac_tbf *tbf_lookup_dl(const uint32_t tlli, const char *imsi)
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{
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/* TODO: look up by IMSI first, then tlli, then old_tlli */
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return tbf_by_tlli(tlli, GPRS_RLCMAC_DL_TBF);
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}
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static int tbf_append_data(struct gprs_rlcmac_tbf *tbf,
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struct gprs_rlcmac_bts *bts,
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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, "TBF: APPEND TFI: %u TLLI: 0x%08x\n", tbf->tfi, tbf->tlli);
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if (tbf->state == GPRS_RLCMAC_WAIT_RELEASE) {
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LOGP(DRLCMAC, LOGL_DEBUG, "TBF in WAIT RELEASE state "
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"(T3193), so reuse TBF\n");
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memcpy(tbf->llc_frame, data, len);
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tbf->llc_length = len;
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/* reset rlc states */
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memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl));
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/* keep to flags */
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tbf->state_flags &= GPRS_RLCMAC_FLAG_TO_MASK;
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tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH);
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tbf_update_ms_class(tbf, ms_class);
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tbf_update(tbf);
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gprs_rlcmac_trigger_downlink_assignment(tbf, tbf, NULL);
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} else {
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/* the TBF exists, so we must write it in the queue
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* we prepend lifetime in front of PDU */
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struct timeval *tv;
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struct msgb *llc_msg = msgb_alloc(len + sizeof(*tv),
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"llc_pdu_queue");
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if (!llc_msg)
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return -ENOMEM;
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tv = (struct timeval *)msgb_put(llc_msg, sizeof(*tv));
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uint16_t delay_csec;
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if (bts->force_llc_lifetime)
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delay_csec = bts->force_llc_lifetime;
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else
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delay_csec = pdu_delay_csec;
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/* keep timestap at 0 for infinite delay */
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if (delay_csec != 0xffff) {
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/* calculate timestamp of timeout */
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gettimeofday(tv, NULL);
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tv->tv_usec += (delay_csec % 100) * 10000;
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tv->tv_sec += delay_csec / 100;
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if (tv->tv_usec > 999999) {
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tv->tv_usec -= 1000000;
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tv->tv_sec++;
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}
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}
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memcpy(msgb_put(llc_msg, len), data, len);
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msgb_enqueue(&tbf->llc_queue, llc_msg);
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tbf_update_ms_class(tbf, ms_class);
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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 uint8_t ms_class,
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const uint8_t *data, const uint16_t len)
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{
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uint8_t trx, ta, ss;
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int8_t use_trx;
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struct gprs_rlcmac_tbf *old_tbf, *tbf;
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int8_t tfi; /* must be signed */
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int rc;
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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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tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF);
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if (tbf && tbf->dir.ul.contention_resolution_done
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&& !tbf->dir.ul.final_ack_sent) {
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use_trx = tbf->trx;
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ta = tbf->ta;
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ss = 0;
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old_tbf = tbf;
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} else {
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use_trx = -1;
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/* we already have an uplink TBF, so we use that TA */
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if (tbf)
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ta = tbf->ta;
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else {
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/* recall TA */
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rc = recall_timing_advance(tlli);
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if (rc < 0) {
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LOGP(DRLCMAC, LOGL_NOTICE, "TA unknown"
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", assuming 0\n");
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ta = 0;
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} else
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ta = rc;
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}
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ss = 1; /* PCH assignment only allows one timeslot */
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old_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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tfi = tfi_find_free(bts, GPRS_RLCMAC_DL_TBF, &trx, use_trx);
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if (tfi < 0) {
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LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n");
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/* FIXME: send reject */
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return -EBUSY;
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}
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/* set number of downlink slots according to multislot class */
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tbf = tbf_alloc(bts, tbf, GPRS_RLCMAC_DL_TBF, tfi, trx, ms_class, ss);
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if (!tbf) {
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LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
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/* FIXME: send reject */
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return -EBUSY;
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}
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tbf->tlli = tlli;
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tbf->tlli_valid = 1;
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tbf->ta = ta;
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LOGP(DRLCMAC, LOGL_DEBUG,
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"TBF: [DOWNLINK] START TFI: %d TLLI: 0x%08x \n",
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tbf->tfi, tbf->tlli);
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/* new TBF, so put first frame */
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memcpy(tbf->llc_frame, data, len);
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tbf->llc_length = len;
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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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gprs_rlcmac_trigger_downlink_assignment(tbf, old_tbf, imsi);
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/* store IMSI for debugging purpose. TODO: it is more than debugging */
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tbf_assign_imsi(tbf, imsi);
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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 tbf_handle(struct gprs_rlcmac_bts *bts,
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const uint32_t tlli, const char *imsi,
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const uint8_t ms_class, 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_tbf *tbf;
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/* check for existing TBF */
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tbf = tbf_lookup_dl(tlli, imsi);
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if (tbf) {
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int rc = tbf_append_data(tbf, bts, ms_class,
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delay_csec, data, len);
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if (rc >= 0)
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tbf_assign_imsi(tbf, imsi);
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return rc;
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}
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return tbf_new_dl_assignment(bts, imsi, tlli, ms_class, data, len);
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}
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struct gprs_rlcmac_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts,
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int8_t use_trx, uint8_t ms_class,
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uint32_t tlli, uint8_t ta, struct gprs_rlcmac_tbf *dl_tbf)
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{
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uint8_t trx;
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struct gprs_rlcmac_tbf *tbf;
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uint8_t tfi;
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#warning "Copy and paste with tbf_new_dl_assignment"
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/* create new TBF, use sme TRX as DL TBF */
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tfi = tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &trx, use_trx);
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if (tfi < 0) {
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LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
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/* FIXME: send reject */
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return NULL;
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}
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/* use multislot class of downlink TBF */
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tbf = tbf_alloc(bts, dl_tbf, GPRS_RLCMAC_UL_TBF, tfi, trx, ms_class, 0);
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if (!tbf) {
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LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
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/* FIXME: send reject */
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return NULL;
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}
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tbf->tlli = tlli;
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tbf->tlli_valid = 1; /* no contention resolution */
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tbf->dir.ul.contention_resolution_done = 1;
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tbf->ta = ta; /* use current TA */
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tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN);
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tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH);
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tbf_timer_start(tbf, 3169, bts->t3169, 0);
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return tbf;
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}
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void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_trx *trx)
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{
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for (uint8_t tfi = 0; tfi < 32; tfi++) {
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struct gprs_rlcmac_tbf *tbf;
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tbf = trx->ul_tbf[tfi];
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if (tbf)
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tbf_free(tbf);
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tbf = trx->dl_tbf[tfi];
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if (tbf)
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tbf_free(tbf);
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}
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}
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