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/* sba.cpp
*
* Copyright (C) 2012 Ivan Klyuchnikov
* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
* Copyright (C) 2013 by Holger Hans Peter Freyther
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <gprs_rlcmac.h>
#include <gprs_debug.h>
#include <bts.h>
extern "C" {
#include <osmocom/core/talloc.h>
}
#include <errno.h>
extern void *tall_pcu_ctx;
/* starting time for assigning single slot
* This offset must be a multiple of 13. */
#define AGCH_START_OFFSET 52
LLIST_HEAD(gprs_rlcmac_sbas);
int sba_alloc(struct gprs_rlcmac_bts *bts,
uint8_t *_trx, uint8_t *_ts, uint32_t *_fn, uint8_t ta)
{
struct gprs_rlcmac_pdch *pdch;
struct gprs_rlcmac_sba *sba;
uint8_t trx, ts;
uint32_t fn;
sba = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_sba);
if (!sba)
return -ENOMEM;
for (trx = 0; trx < 8; trx++) {
for (ts = 0; ts < 8; ts++) {
pdch = &bts->trx[trx].pdch[ts];
if (!pdch->is_enabled())
continue;
break;
}
if (ts < 8)
break;
}
if (trx == 8) {
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH available.\n");
talloc_free(sba);
return -EINVAL;
}
fn = (pdch->last_rts_fn + AGCH_START_OFFSET) % 2715648;
sba->trx = trx;
sba->ts = ts;
sba->fn = fn;
sba->ta = ta;
llist_add(&sba->list, &gprs_rlcmac_sbas);
*_trx = trx;
*_ts = ts;
*_fn = fn;
return 0;
}
struct gprs_rlcmac_sba *sba_find(uint8_t trx, uint8_t ts, uint32_t fn)
{
struct gprs_rlcmac_sba *sba;
llist_for_each_entry(sba, &gprs_rlcmac_sbas, list) {
if (sba->trx == trx && sba->ts == ts && sba->fn == fn)
return sba;
}
return NULL;
}
uint32_t sched_sba(uint8_t trx, uint8_t ts, uint32_t fn, uint8_t block_nr)
{
uint32_t sba_fn;
struct gprs_rlcmac_sba *sba;
/* check special TBF for events */
sba_fn = fn + 4;
if ((block_nr % 3) == 2)
sba_fn ++;
sba_fn = sba_fn % 2715648;
sba = sba_find(trx, ts, sba_fn);
if (sba)
return sba_fn;
return 0xffffffff;
}
int gprs_rlcmac_sba_timeout(struct gprs_rlcmac_sba *sba)
{
LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for SBA\n");
llist_del(&sba->list);
talloc_free(sba);
return 0;
}
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