dissolve libbsc: move all to src/osmo-bsc, link .o files

Move all of libbsc/ into osmo-bsc/, and separate/move some implementations to
allow linking from utils/* and ipaccess/* without pulling in unccessary
dependencies.

Some utilities use gsm_network and gsm_bts structs, which already include data
structures for fairly advanced uses. Move initialization that only osmo-bsc
needs into new bsc_network_init() and bsc_bts_alloc_register() functions, so
that the leaner tools can use the old gsm_* versions without the need to link
everything (e.g. handover and lchan alloc code).

In some instances, there need to be stubs if to cut off linking "just before
the RSL level" and prevent dependencies from creeping in.
- abis_rsl_rcvmsg(): the only program currently interpreting RSL messages is
  osmo-bsc, the utils are merely concerned with OML, if at all.
- paging_flush_bts(): ip.access nanobts models call this when the RSL link is
  dropped. Only osmo-bsc actually needs to do anything there.
- on_gsm_ts_init(): the mechanism to trigger timeslot initialization is related
  to OML, while this action to take on init would pull in RSL dependencies.
utils/ and ipaccess/ each have a stubs.c file to implement these stubs. Tests
implement stubs inline where required.

From src/utils/, src/ipaccess/ and tests/*/, link in .o files from osmo-bsc/.
In order for this to work, the osmo-bsc subdir must be built before the other
source trees. (An alternative would be to include the .c files as sources, but
that would re-compile them in every source tree. Not a large burden really, but
unless linking .o files gives problems, let's have the quicker build.)

Minor obvious cleanups creep in with this patch, I will not bother to name them
individually now unless code review asks me to.

Rationale:

1) libbsc has been separate to use it for osmo-nitb and osmo-bsc in the old
openbsc.git. This is no longer required, and spreading over libbsc and osmo-bsc
is distracting.

2) Recently, ridiculous linking requirements have made adding new functions
cumbersome, because libbsc has started depending on osmo-bsc/*.c
implementations: on gscon FSM and bssap functions. For example, neither
bs11_config nor ipaccess-config nor bts_test need handover_cfg or BSSMAP
message composition. It makes no sense to link the entire osmo-bsc to it, nor
do we want to keep adding stubs to each linking realm.

Change-Id: I36a586726f5818121abe54d25654819fc451d3bf

1 files changed, 0 insertions, 746 deletions

diff --git a/src/libbsc/chan_alloc.c b/src/libbsc/chan_alloc.c
deleted file mode 100644
index 4eccff0df..000000000
--- a/src/libbsc/chan_alloc.c
+++ /dev/null
@@ -1,746 +0,0 @@
-/* GSM Channel allocation routines
- *
- * (C) 2008 by Harald Welte <laforge@gnumonks.org>
- * (C) 2008, 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
- *
- * All Rights Reserved
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation; either version 3 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 Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-#include <inttypes.h>
-
-#include <osmocom/bsc/chan_alloc.h>
-#include <osmocom/bsc/abis_nm.h>
-#include <osmocom/bsc/abis_rsl.h>
-#include <osmocom/bsc/debug.h>
-#include <osmocom/bsc/signal.h>
-#include <osmocom/bsc/gsm_04_08_utils.h>
-
-#include <osmocom/core/talloc.h>
-
-bool ts_is_usable(const struct gsm_bts_trx_ts *ts)
-{
-	if (!trx_is_usable(ts->trx)) {
-		LOGP(DRLL, LOGL_DEBUG, "%s not usable\n", gsm_trx_name(ts->trx));
-		return false;
-	}
-
-	/* If a TCH/F_PDCH TS is busy changing, it is already taken or not
-	 * yet available. */
-	if (ts->pchan == GSM_PCHAN_TCH_F_PDCH) {
-		if (ts->flags & TS_F_PDCH_PENDING_MASK) {
-			LOGP(DRLL, LOGL_DEBUG, "%s in switchover, not available\n",
-			     gsm_ts_and_pchan_name(ts));
-			return false;
-		}
-	}
-
-	/* If a dynamic channel is busy changing, it is already taken or not
-	 * yet available. */
-	if (ts->pchan == GSM_PCHAN_TCH_F_TCH_H_PDCH) {
-		if (ts->dyn.pchan_is != ts->dyn.pchan_want) {
-			LOGP(DRLL, LOGL_DEBUG, "%s in switchover, not available\n",
-			     gsm_ts_and_pchan_name(ts));
-			return false;
-		}
-	}
-
-	return true;
-}
-
-bool trx_is_usable(const struct gsm_bts_trx *trx)
-{
-	/* FIXME: How does this behave for BS-11 ? */
-	if (is_ipaccess_bts(trx->bts)) {
-		if (!nm_is_running(&trx->mo.nm_state) ||
-		    !nm_is_running(&trx->bb_transc.mo.nm_state))
-			return false;
-	}
-
-	return true;
-}
-
-static int trx_count_free_ts(struct gsm_bts_trx *trx, enum gsm_phys_chan_config pchan)
-{
-	struct gsm_bts_trx_ts *ts;
-	int j, ss;
-	int count = 0;
-
-	if (!trx_is_usable(trx))
-		return 0;
-
-	for (j = 0; j < ARRAY_SIZE(trx->ts); j++) {
-		enum gsm_phys_chan_config ts_pchan_is;
-		ts = &trx->ts[j];
-		if (!ts_is_usable(ts))
-			continue;
-
-		ts_pchan_is = ts_pchan(ts);
-
-		if (ts_pchan_is == GSM_PCHAN_PDCH) {
-			/* Dynamic timeslots in PDCH mode will become TCH if needed. */
-			switch (ts->pchan) {
-			case GSM_PCHAN_TCH_F_PDCH:
-				if (pchan == GSM_PCHAN_TCH_F)
-					count++;
-				continue;
-
-			case GSM_PCHAN_TCH_F_TCH_H_PDCH:
-				if (pchan == GSM_PCHAN_TCH_F)
-					count++;
-				else if (pchan == GSM_PCHAN_TCH_H)
-					count += 2;
-				continue;
-
-			default:
-				/* Not dynamic, not applicable. */
-				continue;
-			}
-		}
-
-		if (ts_pchan_is != pchan)
-			continue;
-		/* check if all sub-slots are allocated yet */
-		for (ss = 0; ss < ts_subslots(ts); ss++) {
-			struct gsm_lchan *lc = &ts->lchan[ss];
-			if (lc->type == GSM_LCHAN_NONE &&
-			    lc->state == LCHAN_S_NONE)
-				count++;
-		}
-	}
-
-	return count;
-}
-
-/* Count number of free TS of given pchan type */
-int bts_count_free_ts(struct gsm_bts *bts, enum gsm_phys_chan_config pchan)
-{
-	struct gsm_bts_trx *trx;
-	int count = 0;
-
-	llist_for_each_entry(trx, &bts->trx_list, list)
-		count += trx_count_free_ts(trx, pchan);
-
-	return count;
-}
-
-static bool ts_usable_as_pchan(struct gsm_bts_trx_ts *ts,
-			       enum gsm_phys_chan_config as_pchan)
-{
-	switch (ts->pchan) {
-	case GSM_PCHAN_TCH_F_PDCH:
-		if (ts->flags & TS_F_PDCH_PENDING_MASK) {
-			/* currently being switched over. Not usable. */
-			return false;
-		}
-		switch (as_pchan) {
-		case GSM_PCHAN_TCH_F:
-		case GSM_PCHAN_PDCH:
-			/* continue to check below. */
-			break;
-		default:
-			return false;
-		}
-		break;
-
-	case GSM_PCHAN_TCH_F_TCH_H_PDCH:
-		if (ts->dyn.pchan_is != ts->dyn.pchan_want) {
-			/* currently being switched over. Not usable. */
-			return false;
-		}
-		switch (as_pchan) {
-		case GSM_PCHAN_TCH_F:
-		case GSM_PCHAN_TCH_H:
-		case GSM_PCHAN_PDCH:
-			/* continue to check below. */
-			break;
-		default:
-			return false;
-		}
-		break;
-
-	default:
-		/* static timeslots never switch. */
-		return ts->pchan == as_pchan;
-	}
-
-	/* Dynamic timeslots -- Checks depending on the current actual pchan mode: */
-	switch (ts_pchan(ts)) {
-	case GSM_PCHAN_NONE:
-		/* Not initialized, possibly because GPRS was disabled. We may switch. */
-		return true;
-
-	case GSM_PCHAN_PDCH:
-		/* This slot is in PDCH mode and available to switch pchan mode. But check for
-		 * error states: */
-		if (ts->lchan->state != LCHAN_S_NONE && ts->lchan->state != LCHAN_S_ACTIVE)
-			return false;
-		return true;
-
-	case GSM_PCHAN_TCH_F:
-	case GSM_PCHAN_TCH_H:
-		/* No need to switch at all? */
-		if (ts_pchan(ts) == as_pchan)
-			return true;
-
-		/* If any lchan is in use, we can't change the pchan kind */
-		{
-			int ss;
-			int subslots = ts_subslots(ts);
-			for (ss = 0; ss < subslots; ss++) {
-				struct gsm_lchan *lc = &ts->lchan[ss];
-				if (lc->type != GSM_LCHAN_NONE || lc->state != LCHAN_S_NONE)
-					return false;
-			}
-		}
-		return true;
-
-	default:
-		/* Not implemented. */
-		return false;
-	}
-}
-
-static struct gsm_lchan *
-_lc_find_trx(struct gsm_bts_trx *trx, enum gsm_phys_chan_config pchan,
-	     enum gsm_phys_chan_config as_pchan)
-{
-	struct gsm_bts_trx_ts *ts;
-	int j, start, stop, dir, ss;
-	int check_subslots;
-
-#define LOGPLCHANALLOC(fmt, args...) \
-		LOGP(DRLL, LOGL_DEBUG, "looking for lchan %s as %s: " fmt, \
-		     gsm_pchan_name(pchan), gsm_pchan_name(as_pchan), ## args)
-
-	if (!trx_is_usable(trx)) {
-		LOGPLCHANALLOC("%s trx not usable\n", gsm_trx_name(trx));
-		return NULL;
-	}
-
-	if (trx->bts->chan_alloc_reverse) {
-		/* check TS 7..0 */
-		start = 7;
-		stop = -1;
-		dir = -1;
-	} else {
-		/* check TS 0..7 */
-		start = 0;
-		stop = 8;
-		dir = 1;
-	}
-
-	for (j = start; j != stop; j += dir) {
-		ts = &trx->ts[j];
-		if (!ts_is_usable(ts))
-			continue;
-		/* The caller first selects what kind of TS to search in, e.g. looking for exact
-		 * GSM_PCHAN_TCH_F, or maybe among dynamic GSM_PCHAN_TCH_F_TCH_H_PDCH... */
-		if (ts->pchan != pchan) {
-			LOGPLCHANALLOC("%s is != %s\n", gsm_ts_and_pchan_name(ts),
-				       gsm_pchan_name(pchan));
-			continue;
-		}
-		/* Next, is this timeslot in or can it be switched to the pchan we want to use it for? */
-		if (!ts_usable_as_pchan(ts, as_pchan)) {
-			LOGPLCHANALLOC("%s is not usable as %s\n", gsm_ts_and_pchan_name(ts),
-				       gsm_pchan_name(as_pchan));
-			continue;
-		}
-		/* If we need to switch it, after above check we are also allowed to switch it, and we
-		 * will always use the first lchan after the switch. Return that lchan and rely on the
-		 * caller to perform the pchan switchover. */
-		if (ts_pchan(ts) != as_pchan) {
-			LOGPLCHANALLOC("%s is a match, will switch to %s\n", gsm_ts_and_pchan_name(ts),
-				       gsm_pchan_name(as_pchan));
-			return ts->lchan;
-		}
-
-		/* TS is in desired pchan mode. Go ahead and check for an available lchan. */
-		check_subslots = ts_subslots(ts);
-		for (ss = 0; ss < check_subslots; ss++) {
-			struct gsm_lchan *lc = &ts->lchan[ss];
-			if (lc->type == GSM_LCHAN_NONE &&
-			    lc->state == LCHAN_S_NONE) {
-				LOGPLCHANALLOC("%s ss=%d is available\n", gsm_ts_and_pchan_name(ts),
-					       lc->nr);
-				return lc;
-			}
-			LOGPLCHANALLOC("%s ss=%d in type=%s,state=%s not suitable\n",
-				       gsm_ts_and_pchan_name(ts), lc->nr, gsm_lchant_name(lc->type),
-				       gsm_lchans_name(lc->state));
-		}
-	}
-
-	return NULL;
-#undef LOGPLCHANALLOC
-}
-
-static struct gsm_lchan *
-_lc_dyn_find_bts(struct gsm_bts *bts, enum gsm_phys_chan_config pchan,
-		 enum gsm_phys_chan_config dyn_as_pchan)
-{
-	struct gsm_bts_trx *trx;
-	struct gsm_lchan *lc;
-
-	if (bts->chan_alloc_reverse) {
-		llist_for_each_entry_reverse(trx, &bts->trx_list, list) {
-			lc = _lc_find_trx(trx, pchan, dyn_as_pchan);
-			if (lc)
-				return lc;
-		}
-	} else {
-		llist_for_each_entry(trx, &bts->trx_list, list) {
-			lc = _lc_find_trx(trx, pchan, dyn_as_pchan);
-			if (lc)
-				return lc;
-		}
-	}
-
-	return NULL;
-}
-
-static struct gsm_lchan *
-_lc_find_bts(struct gsm_bts *bts, enum gsm_phys_chan_config pchan)
-{
-	return _lc_dyn_find_bts(bts, pchan, pchan);
-}
-
-/* Allocate a logical channel.
- *
- * Dynamic channel types: we always prefer a dedicated TS, and only pick +
- * switch a dynamic TS if no pure TS of the requested PCHAN is available.
- *
- * TCH_F/PDCH: if we pick a PDCH ACT style dynamic TS as TCH/F channel, PDCH
- * will be disabled in rsl_chan_activate_lchan(); there is no need to check
- * whether PDCH mode is currently active, here.
- */
-struct gsm_lchan *lchan_alloc(struct gsm_bts *bts, enum gsm_chan_t type,
-			      int allow_bigger)
-{
-	struct gsm_lchan *lchan = NULL;
-	enum gsm_phys_chan_config first, first_cbch, second, second_cbch;
-
-	LOGP(DRLL, LOGL_DEBUG, "(bts=%d) lchan_alloc(%s)\n", bts->nr, gsm_lchant_name(type));
-
-	switch (type) {
-	case GSM_LCHAN_SDCCH:
-		if (bts->chan_alloc_reverse) {
-			first = GSM_PCHAN_SDCCH8_SACCH8C;
-			first_cbch = GSM_PCHAN_SDCCH8_SACCH8C_CBCH;
-			second = GSM_PCHAN_CCCH_SDCCH4;
-			second_cbch = GSM_PCHAN_CCCH_SDCCH4_CBCH;
-		} else {
-			first = GSM_PCHAN_CCCH_SDCCH4;
-			first_cbch = GSM_PCHAN_CCCH_SDCCH4_CBCH;
-			second = GSM_PCHAN_SDCCH8_SACCH8C;
-			second_cbch = GSM_PCHAN_SDCCH8_SACCH8C_CBCH;
-		}
-
-		lchan = _lc_find_bts(bts, first);
-		if (lchan == NULL)
-			lchan = _lc_find_bts(bts, first_cbch);
-		if (lchan == NULL)
-			lchan = _lc_find_bts(bts, second);
-		if (lchan == NULL)
-			lchan = _lc_find_bts(bts, second_cbch);
-
-		/* allow to assign bigger channels */
-		if (allow_bigger) {
-			if (lchan == NULL) {
-				lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_H);
-				if (lchan)
-					type = GSM_LCHAN_TCH_H;
-			}
-
-			if (lchan == NULL) {
-				lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_F);
-				if (lchan)
-					type = GSM_LCHAN_TCH_F;
-			}
-
-			/* try dynamic TCH/F_PDCH */
-			if (lchan == NULL) {
-				lchan = _lc_dyn_find_bts(bts, GSM_PCHAN_TCH_F_PDCH,
-							 GSM_PCHAN_TCH_F);
-				/* TCH/F_PDCH will be used as TCH/F */
-				if (lchan)
-					type = GSM_LCHAN_TCH_F;
-			}
-
-			/* try fully dynamic TCH/F_TCH/H_PDCH */
-			if (lchan == NULL) {
-				lchan = _lc_dyn_find_bts(bts, GSM_PCHAN_TCH_F_TCH_H_PDCH,
-							 GSM_PCHAN_TCH_H);
-				if (lchan)
-					type = GSM_LCHAN_TCH_H;
-			}
-			/*
-			 * No need to check fully dynamic channels for TCH/F:
-			 * if no TCH/H was available, neither will be TCH/F.
-			 */
-		}
-		break;
-	case GSM_LCHAN_TCH_F:
-		lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_F);
-		/* If we don't have TCH/F available, fall-back to TCH/H */
-		if (!lchan) {
-			lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_H);
-			if (lchan)
-				type = GSM_LCHAN_TCH_H;
-		}
-		/* If we don't have TCH/H either, try dynamic TCH/F_PDCH */
-		if (!lchan) {
-			lchan = _lc_dyn_find_bts(bts, GSM_PCHAN_TCH_F_PDCH,
-						 GSM_PCHAN_TCH_F);
-			/* TCH/F_PDCH used as TCH/F -- here, type is already
-			 * set to GSM_LCHAN_TCH_F, but for clarity's sake... */
-			if (lchan)
-				type = GSM_LCHAN_TCH_F;
-		}
-
-		/* Try fully dynamic TCH/F_TCH/H_PDCH as TCH/F... */
-		if (!lchan && bts->network->dyn_ts_allow_tch_f) {
-			lchan = _lc_dyn_find_bts(bts,
-						 GSM_PCHAN_TCH_F_TCH_H_PDCH,
-						 GSM_PCHAN_TCH_F);
-			if (lchan)
-				type = GSM_LCHAN_TCH_F;
-		}
-		/* ...and as TCH/H. */
-		if (!lchan) {
-			lchan = _lc_dyn_find_bts(bts,
-						 GSM_PCHAN_TCH_F_TCH_H_PDCH,
-						 GSM_PCHAN_TCH_H);
-			if (lchan)
-				type = GSM_LCHAN_TCH_H;
-		}
-		break;
-	case GSM_LCHAN_TCH_H:
-		lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_H);
-		/* If we don't have TCH/H available, fall-back to TCH/F */
-		if (!lchan) {
-			lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_F);
-			if (lchan)
-				type = GSM_LCHAN_TCH_F;
-		}
-		/* No dedicated TCH/x available -- try fully dynamic
-		 * TCH/F_TCH/H_PDCH */
-		if (!lchan) {
-			lchan = _lc_dyn_find_bts(bts,
-						 GSM_PCHAN_TCH_F_TCH_H_PDCH,
-						 GSM_PCHAN_TCH_H);
-			if (lchan)
-				type = GSM_LCHAN_TCH_H;
-		}
-		/*
-		 * No need to check TCH/F_TCH/H_PDCH channels for TCH/F:
-		 * if no TCH/H was available, neither will be TCH/F.
-		 */
-		/* If we don't have TCH/F either, try dynamic TCH/F_PDCH */
-		if (!lchan) {
-			lchan = _lc_dyn_find_bts(bts, GSM_PCHAN_TCH_F_PDCH,
-						 GSM_PCHAN_TCH_F);
-			if (lchan)
-				type = GSM_LCHAN_TCH_F;
-		}
-		break;
-	default:
-		LOGP(DRLL, LOGL_ERROR, "Unknown gsm_chan_t %u\n", type);
-	}
-
-	if (lchan) {
-		lchan->type = type;
-
-		LOGP(DRLL, LOGL_INFO, "%s Allocating lchan=%u as %s\n",
-		     gsm_ts_and_pchan_name(lchan->ts),
-		     lchan->nr, gsm_lchant_name(lchan->type));
-
-		/* reset measurement report counter and index */
-	        lchan->meas_rep_count = 0;
-	        lchan->meas_rep_idx = 0;
-	        lchan->meas_rep_last_seen_nr = 255;
-
-		/* clear sapis */
-		memset(lchan->sapis, 0, ARRAY_SIZE(lchan->sapis));
-
-		/* clear multi rate config */
-		memset(&lchan->mr_ms_lv, 0, sizeof(lchan->mr_ms_lv));
-		memset(&lchan->mr_bts_lv, 0, sizeof(lchan->mr_bts_lv));
-		lchan->broken_reason = "";
-	} else {
-		struct challoc_signal_data sig;
-
-		LOGP(DRLL, LOGL_ERROR, "(bts=%d) Failed to allocate %s channel\n",
-		     bts->nr, gsm_lchant_name(type));
-
-		sig.bts = bts;
-		sig.type = type;
-		osmo_signal_dispatch(SS_CHALLOC, S_CHALLOC_ALLOC_FAIL, &sig);
-	}
-
-	return lchan;
-}
-
-/* Free a logical channel */
-void lchan_free(struct gsm_lchan *lchan)
-{
-	struct challoc_signal_data sig;
-	int i;
-
-	sig.type = lchan->type;
-	lchan->type = GSM_LCHAN_NONE;
-
-
-	if (lchan->conn
-	    && !(lchan->ts->pchan == GSM_PCHAN_TCH_F_TCH_H_PDCH
-		 && lchan->ts->dyn.pchan_is != lchan->ts->dyn.pchan_want)) {
-		struct lchan_signal_data sig;
-
-		/* We might kill an active channel... */
-		sig.lchan = lchan;
-		sig.mr = NULL;
-		osmo_signal_dispatch(SS_LCHAN, S_LCHAN_UNEXPECTED_RELEASE, &sig);
-	}
-
-	/* stop the timer */
-	osmo_timer_del(&lchan->T3101);
-
-	/* clear cached measuement reports */
-	lchan->meas_rep_idx = 0;
-	for (i = 0; i < ARRAY_SIZE(lchan->meas_rep); i++) {
-		lchan->meas_rep[i].flags = 0;
-		lchan->meas_rep[i].nr = 0;
-	}
-	for (i = 0; i < ARRAY_SIZE(lchan->neigh_meas); i++)
-		lchan->neigh_meas[i].arfcn = 0;
-
-	if (lchan->rqd_ref) {
-		talloc_free(lchan->rqd_ref);
-		lchan->rqd_ref = NULL;
-		lchan->rqd_ta = 0;
-	}
-
-	sig.lchan = lchan;
-	sig.bts = lchan->ts->trx->bts;
-	osmo_signal_dispatch(SS_CHALLOC, S_CHALLOC_FREED, &sig);
-
-	if (lchan->conn
-	    && !(lchan->ts->pchan == GSM_PCHAN_TCH_F_TCH_H_PDCH
-		 && lchan->ts->dyn.pchan_is != lchan->ts->dyn.pchan_want)) {
-		LOGP(DRLL, LOGL_ERROR, "the subscriber connection should be gone.\n");
-		lchan->conn = NULL;
-	}
-
-	/* FIXME: ts_free() the timeslot, if we're the last logical
-	 * channel using it */
-}
-
-/*
- * There was an error with the TRX and we need to forget
- * any state so that a lchan can be allocated again after
- * the trx is fully usable.
- *
- * This should be called after lchan_free to force a channel
- * be available for allocation again. This means that this
- * method will stop the "delay after error"-timer and set the
- * state to LCHAN_S_NONE.
- */
-void lchan_reset(struct gsm_lchan *lchan)
-{
-	osmo_timer_del(&lchan->T3101);
-	osmo_timer_del(&lchan->T3109);
-	osmo_timer_del(&lchan->T3111);
-	osmo_timer_del(&lchan->error_timer);
-
-	lchan->type = GSM_LCHAN_NONE;
-	rsl_lchan_set_state(lchan, LCHAN_S_NONE);
-}
-
-/* Drive the release process of the lchan */
-static void _lchan_handle_release(struct gsm_lchan *lchan,
-				  int sacch_deact, int mode)
-{
-	/* Release all SAPIs on the local end and continue */
-	rsl_release_sapis_from(lchan, 1, RSL_REL_LOCAL_END);
-
-	/*
-	 * Shall we send a RR Release, start T3109 and wait for the
-	 * release indication from the BTS or just take it down (e.g.
-	 * on assignment requests)
-	 */
-	if (sacch_deact) {
-		gsm48_send_rr_release(lchan);
-
-		/* Deactivate the SACCH on the BTS side */
-		rsl_deact_sacch(lchan);
-		rsl_start_t3109(lchan);
-	} else if (lchan->sapis[0] == LCHAN_SAPI_UNUSED) {
-		rsl_direct_rf_release(lchan);
-	} else {
-		rsl_release_request(lchan, 0, mode);
-	}
-}
-
-/* Consider releasing the channel now */
-int lchan_release(struct gsm_lchan *lchan, int sacch_deact, enum rsl_rel_mode mode)
-{
-	DEBUGP(DRLL, "%s starting release sequence\n", gsm_lchan_name(lchan));
-	rsl_lchan_set_state(lchan, LCHAN_S_REL_REQ);
-
-	lchan->conn = NULL;
-	_lchan_handle_release(lchan, sacch_deact, mode);
-	return 1;
-}
-
-void bts_chan_load(struct pchan_load *cl, const struct gsm_bts *bts)
-{
-	struct gsm_bts_trx *trx;
-
-	llist_for_each_entry(trx, &bts->trx_list, list) {
-		int i;
-
-		/* skip administratively deactivated tranxsceivers */
-		if (!nm_is_running(&trx->mo.nm_state) ||
-		    !nm_is_running(&trx->bb_transc.mo.nm_state))
-			continue;
-
-		for (i = 0; i < ARRAY_SIZE(trx->ts); i++) {
-			struct gsm_bts_trx_ts *ts = &trx->ts[i];
-			struct load_counter *pl = &cl->pchan[ts->pchan];
-			int j;
-			int subslots;
-
-			/* skip administratively deactivated timeslots */
-			if (!nm_is_running(&ts->mo.nm_state))
-				continue;
-
-			subslots = ts_subslots(ts);
-			for (j = 0; j < subslots; j++) {
-				struct gsm_lchan *lchan = &ts->lchan[j];
-
-				pl->total++;
-
-				switch (lchan->state) {
-				case LCHAN_S_NONE:
-					break;
-				default:
-					pl->used++;
-					break;
-				}
-			}
-		}
-	}
-}
-
-void network_chan_load(struct pchan_load *pl, struct gsm_network *net)
-{
-	struct gsm_bts *bts;
-
-	memset(pl, 0, sizeof(*pl));
-
-	llist_for_each_entry(bts, &net->bts_list, list)
-		bts_chan_load(pl, bts);
-}
-
-/* Update T3122 wait indicator based on samples of BTS channel load. */
-void
-bts_update_t3122_chan_load(struct gsm_bts *bts)
-{
-	struct pchan_load pl;
-	uint64_t used = 0;
-	uint32_t total = 0;
-	uint64_t load;
-	uint64_t wait_ind;
-	static const uint8_t min_wait_ind = GSM_T3122_DEFAULT;
-	static const uint8_t max_wait_ind = 128; /* max wait ~2 minutes */
-	int i;
-
-	/* Ignore BTS that are not in operation, in order to not flood the log with "bogus channel load"
-	 * messages */
-	if (!trx_is_usable(bts->c0))
-		return;
-
-	/* Sum up current load across all channels. */
-	memset(&pl, 0, sizeof(pl));
-	bts_chan_load(&pl, bts);
-	for (i = 0; i < ARRAY_SIZE(pl.pchan); i++) {
-		struct load_counter *lc = &pl.pchan[i];
-
-		/* Ignore samples too large for fixed-point calculations (shouldn't happen). */
-		if (lc->used > UINT16_MAX || lc->total > UINT16_MAX) {
-			LOGP(DRLL, LOGL_NOTICE, "(bts=%d) numbers in channel load sample "
-			     "too large (used=%u / total=%u)\n", bts->nr, lc->used, lc->total);
-			continue;
-		}
-
-		used += lc->used;
-		total += lc->total;
-	}
-
-	/* Check for invalid samples (shouldn't happen). */
-	if (total == 0 || used > total) {
-		LOGP(DRLL, LOGL_NOTICE, "(bts=%d) bogus channel load sample (used=%"PRIu64" / total=%"PRIu32")\n",
-		     bts->nr, used, total);
-		bts->T3122 = 0; /* disable override of network-wide default value */
-		bts->chan_load_samples_idx = 0; /* invalidate other samples collected so far */
-		return;
-	}
-
-	/* If we haven't got enough samples yet, store measurement for later use. */
-	if (bts->chan_load_samples_idx < ARRAY_SIZE(bts->chan_load_samples)) {
-		struct load_counter *sample = &bts->chan_load_samples[bts->chan_load_samples_idx++];
-		sample->total = (unsigned int)total;
-		sample->used = (unsigned int)used;
-		return;
-	}
-
-	/* We have enough samples and will overwrite our current samples later. */
-	bts->chan_load_samples_idx = 0;
-
-	/* Add all previous samples to the current sample. */
-	for (i = 0; i < ARRAY_SIZE(bts->chan_load_samples); i++) {
-		struct load_counter *sample = &bts->chan_load_samples[i];
-		total += sample->total;
-		used += sample->used;
-	}
-
-	used <<= 8; /* convert to fixed-point */
-
-	/* Log channel load average. */
-	load = ((used / total) * 100);
-	LOGP(DRLL, LOGL_DEBUG, "(bts=%d) channel load average is %"PRIu64".%.2"PRIu64"%%\n",
-	     bts->nr, (load & 0xffffff00) >> 8, (load & 0xff) / 10);
-	bts->chan_load_avg = ((load & 0xffffff00) >> 8);
-	OSMO_ASSERT(bts->chan_load_avg <= 100);
-	osmo_stat_item_set(bts->bts_statg->items[BTS_STAT_CHAN_LOAD_AVERAGE], bts->chan_load_avg);
-
-	/* Calculate new T3122 wait indicator. */
-	wait_ind = ((used / total) * max_wait_ind);
-	wait_ind >>= 8; /* convert from fixed-point to integer */
-	if (wait_ind < min_wait_ind)
-		wait_ind = min_wait_ind;
-	else if (wait_ind > max_wait_ind)
-		wait_ind = max_wait_ind;
-
-	LOGP(DRLL, LOGL_DEBUG, "(bts=%d) T3122 wait indicator set to %"PRIu64" seconds\n", bts->nr, wait_ind);
-	bts->T3122 = (uint8_t)wait_ind;
-	osmo_stat_item_set(bts->bts_statg->items[BTS_STAT_T3122], wait_ind);
-}