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/* GSM BSC Radio Link Layer API
* 3GPP TS 08.58 version 8.6.0 Release 1999 / ETSI TS 100 596 V8.6.0 */
/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <errno.h>
#include <openbsc/debug.h>
#include <osmocore/talloc.h>
#include <osmocore/timer.h>
#include <osmocore/linuxlist.h>
#include <openbsc/bsc_rll.h>
#include <openbsc/gsm_data.h>
#include <openbsc/chan_alloc.h>
#include <openbsc/abis_rsl.h>
struct bsc_rll_req {
struct llist_head list;
struct timer_list timer;
struct gsm_lchan *lchan;
u_int8_t link_id;
void (*cb)(struct gsm_lchan *lchan, u_int8_t link_id,
void *data, enum bsc_rllr_ind);
void *data;
};
/* we only compare C1, C2 and SAPI */
#define LINKID_MASK 0xC7
static LLIST_HEAD(bsc_rll_reqs);
static void complete_rllr(struct bsc_rll_req *rllr, enum bsc_rllr_ind type)
{
llist_del(&rllr->list);
put_lchan(rllr->lchan, 0);
rllr->cb(rllr->lchan, rllr->link_id, rllr->data, type);
talloc_free(rllr);
}
static void timer_cb(void *_rllr)
{
struct bsc_rll_req *rllr = _rllr;
complete_rllr(rllr, BSC_RLLR_IND_TIMEOUT);
}
/* establish a RLL connection with given SAPI / priority */
int rll_establish(struct gsm_lchan *lchan, u_int8_t sapi,
void (*cb)(struct gsm_lchan *, u_int8_t, void *,
enum bsc_rllr_ind),
void *data)
{
struct bsc_rll_req *rllr = talloc_zero(tall_bsc_ctx, struct bsc_rll_req);
u_int8_t link_id;
if (!rllr)
return -ENOMEM;
link_id = sapi;
/* If we are a TCH and not in signalling mode, we need to
* indicate that the new RLL connection is to be made on the SACCH */
if ((lchan->type == GSM_LCHAN_TCH_F ||
lchan->type == GSM_LCHAN_TCH_H) && sapi != 0)
link_id |= 0x40;
use_lchan(lchan);
rllr->lchan = lchan;
rllr->link_id = link_id;
rllr->cb = cb;
rllr->data = data;
llist_add(&rllr->list, &bsc_rll_reqs);
rllr->timer.cb = &timer_cb;
rllr->timer.data = rllr;
bsc_schedule_timer(&rllr->timer, 10, 0);
/* send the RSL RLL ESTablish REQuest */
return rsl_establish_request(rllr->lchan, rllr->link_id);
}
/* Called from RSL code in case we have received an indication regarding
* any RLL link */
void rll_indication(struct gsm_lchan *lchan, u_int8_t link_id, u_int8_t type)
{
struct bsc_rll_req *rllr, *rllr2;
llist_for_each_entry_safe(rllr, rllr2, &bsc_rll_reqs, list) {
if (rllr->lchan == lchan &&
(rllr->link_id & LINKID_MASK) == (link_id & LINKID_MASK)) {
bsc_del_timer(&rllr->timer);
complete_rllr(rllr, type);
return;
}
}
}
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