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Diffstat (limited to 'openbsc/src/bsc_rll.c')
| -rw-r--r-- | openbsc/src/bsc_rll.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/openbsc/src/bsc_rll.c b/openbsc/src/bsc_rll.c new file mode 100644 index 000000000..e9d6f252a --- /dev/null +++ b/openbsc/src/bsc_rll.c @@ -0,0 +1,118 @@ +/* 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); + 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) && + lchan->rsl_cmode != RSL_CMOD_SPD_SIGN) + 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; + } + } +} |