91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
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/* sba.c
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*
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* Copyright (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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* Author: Pau Espin Pedrol <pespin@sysmocom.de>
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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 <sba.h>
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#include <gprs_debug.h>
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#include <bts.h>
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#include <pcu_utils.h>
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#include <pdch.h>
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#include <errno.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/gsm/protocol/gsm_04_08.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include "pdch.h"
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#include "pdch_ul_controller.h"
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/* starting time for assigning single slot
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* This offset must be a multiple of 13. */
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#define AGCH_START_OFFSET 52
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struct gprs_rlcmac_sba *sba_alloc(void *ctx, struct gprs_rlcmac_pdch *pdch, uint8_t ta)
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{
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struct gprs_rlcmac_sba *sba;
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sba = talloc_zero(ctx, struct gprs_rlcmac_sba);
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if (!sba)
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return NULL;
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sba->pdch = pdch;
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sba->ta = ta;
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/* TODO: request ULC for next available FN instead of hardcoded AGCH_START_OFFSET */
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sba->fn = next_fn(pdch->last_rts_fn, AGCH_START_OFFSET);
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pdch_ulc_reserve_sba(pdch->ulc, sba);
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return sba;
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}
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/* Internal use */
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static void sba_free_norelease(struct gprs_rlcmac_sba *sba)
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{
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bts_do_rate_ctr_inc(sba->pdch->trx->bts, CTR_SBA_FREED);
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talloc_free(sba);
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}
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void sba_free(struct gprs_rlcmac_sba *sba)
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{
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if (pdch_ulc_release_fn(sba->pdch->ulc, sba->fn) < 0)
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LOGPDCH(sba->pdch, DRLCMAC, LOGL_NOTICE,
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"Trying to release unregistered SBA (FN=%u, TA=%u)\n",
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sba->fn, sba->ta);
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sba_free_norelease(sba);
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}
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void sba_timeout(struct gprs_rlcmac_sba *sba)
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{
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/* Upon timeout, the UL Controller node is already released */
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sba_free_norelease(sba);
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}
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uint32_t find_sba_rts(struct gprs_rlcmac_pdch *pdch, uint32_t fn, uint8_t block_nr)
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{
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uint32_t sba_fn = rts_next_fn(fn, block_nr);
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struct gprs_rlcmac_sba *sba;
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sba = pdch_ulc_get_sba(pdch->ulc, sba_fn);
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if (sba)
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return sba_fn;
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return 0xffffffff;
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}
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