Have osmo-bts request OML routes for all its MOs at startup

During OML link start-up, osmo-bts now requests a OML route for each
of the managed objects that it currently implements.  This is done via
the 'ORC' (OML Router Control) protocol, which is encapsulated in
the extended IPA_PROTO_OSMO multiplex.

The responses (ACK/NACK) are not yet processed inside osmo-bts.

include/osmo-bts/oml_router_ctrl.h

@@ -27,4 +27,11 @@ struct osmo_omlrctrl_register_req {
 	char name[0];
 } __attribute__((packed));
 
+#include <osmocom/core/msgb.h>
+#include <osmo-bts/oml_routing.h>
+
+struct msgb *gen_orc_route_add(const struct oml_route *rt_in);
+struct msgb *gen_orc_route_del(const struct oml_route *rt_in);
+int abis_orc_sendmsg(struct msgb *msg);
+
 #endif

src/common/Makefile.am

@@ -7,10 +7,10 @@ libbts_a_SOURCES = gsm_data_shared.c sysinfo.c logging.c abis.c oml.c bts.c \
 		   rsl.c vty.c paging.c measurement.c amr.c lchan.c \
 		   load_indication.c pcu_sock.c handover.c msg_utils.c \
 		   load_indication.c pcu_sock.c handover.c msg_utils.c \
-		   tx_power.c bts_ctrl_commands.c bts_ctrl_lookup.c
+		   tx_power.c bts_ctrl_commands.c bts_ctrl_lookup.c \
+		   oml_router_ctrl.c
 
 bin_PROGRAMS = osmobts-omlrouter
 
 osmobts_omlrouter_SOURCES = oml_router.c msg_utils.c oml_routing.c
 osmobts_omlrouter_LDADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOVTY_LIBS) $(LIBOSMOABIS_LIBS) $(LIBOSMOGSM_LIBS)
-

src/common/abis.c

@@ -77,6 +77,15 @@ static struct e1inp_sign_link *sign_link_up(void *unit, struct e1inp_line *line,
 	case E1INP_SIGN_OML:
 		LOGP(DABIS, LOGL_INFO, "OML Signalling link up\n");
 		e1inp_ts_config_sign(&line->ts[E1INP_SIGN_OML-1], line);
+		/* Create OSMO signalling link to talk with OML router */
+		/* Create this first, before the OML link, to ensure OSMO
+		 * messages get dequeued on transmit before OML messages */
+		g_bts->osmo_link =
+			e1inp_sign_link_create(&line->ts[E1INP_SIGN_OML-1],
+						E1INP_SIGN_OSMO, g_bts->c0,
+						IPAC_PROTO_OSMO, 0);
+
+		/* Create OML signalling link */
 		sign_link = g_bts->oml_link =
 			e1inp_sign_link_create(&line->ts[E1INP_SIGN_OML-1],
 						E1INP_SIGN_OML, NULL, 255, 0);

src/common/bts.c

@@ -199,25 +199,35 @@ int bts_link_estab(struct gsm_bts *bts)
 	LOGP(DSUM, LOGL_INFO, "Main link established, sending Status'.\n");
 
 	/* BTS and SITE MGR are EAABLED, BTS is DEPENDENCY */
+	orc_add_route_mo(&bts->site_mgr.mo);
 	oml_tx_state_changed(&bts->site_mgr.mo);
+	orc_add_route_mo(&bts->mo);
 	oml_tx_state_changed(&bts->mo);
 
 	/* those should all be in DEPENDENCY */
+	orc_add_route_mo(&bts->gprs.nse.mo);
 	oml_tx_state_changed(&bts->gprs.nse.mo);
+	orc_add_route_mo(&bts->gprs.cell.mo);
 	oml_tx_state_changed(&bts->gprs.cell.mo);
+	orc_add_route_mo(&bts->gprs.nsvc[0].mo);
 	oml_tx_state_changed(&bts->gprs.nsvc[0].mo);
+	orc_add_route_mo(&bts->gprs.nsvc[1].mo);
 	oml_tx_state_changed(&bts->gprs.nsvc[1].mo);
 
 	/* All other objects start off-line until the BTS Model code says otherwise */
 	for (i = 0; i < bts->num_trx; i++) {
 		struct gsm_bts_trx *trx = gsm_bts_trx_num(bts, i);
 
+		orc_add_route_mo(&trx->mo);
 		oml_tx_state_changed(&trx->mo);
+
+		orc_add_route_mo(&trx->bb_transc.mo);
 		oml_tx_state_changed(&trx->bb_transc.mo);
 
 		for (j = 0; j < ARRAY_SIZE(trx->ts); j++) {
 			struct gsm_bts_trx_ts *ts = &trx->ts[j];
 
+			orc_add_route_mo(&ts->mo);
 			oml_tx_state_changed(&ts->mo);
 		}
 	}

src/common/oml.c

@@ -41,6 +41,7 @@
 #include <osmo-bts/bts_model.h>
 #include <osmo-bts/bts.h>
 #include <osmo-bts/signal.h>
+#include <osmo-bts/oml_router_ctrl.h>
 
 /* FIXME: move this to libosmocore */
 static struct tlv_definition abis_nm_att_tlvdef_ipa = {

src/common/oml_router_ctrl.c

@@ -1,3 +1,24 @@
+/* OML Router Control (client side) */
+
+/* (C) 2014 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 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 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 <osmocom/core/msgb.h>
 #include <osmocom/gsm/protocol/ipaccess.h>
@@ -6,11 +27,13 @@
 #include <osmo-bts/oml_router_ctrl.h>
 #include <osmo-bts/gsm_data.h>
 
+/* send a OML Router Control message via Abis */
 int abis_orc_sendmsg(struct msgb *msg)
 {
 	struct gsm_bts *bts = msg->trx->bts;
 	struct ipaccess_head_ext *he;
 
+	/* push the extended IPA header to the front of the msgb */
 	he = (struct ipaccess_head_ext *) msgb_push(msg, sizeof(*he));
 	he->proto = IPAC_PROTO_EXT_ORC;
 
@@ -46,16 +69,19 @@ static struct msgb *__gen_orc_route(const struct oml_route *rt_in, int del)
 	return msg;
 }
 
+/* generate msgb with OML Router Control ROUTE_ADD_REQ */
 struct msgb *gen_orc_route_add(const struct oml_route *rt_in)
 {
 	return __gen_orc_route(rt_in, 0);
 }
 
+/* generate msgb with OML Router Control ROUTE_DEL_REQ */
 struct msgb *gen_orc_route_del(const struct oml_route *rt_in)
 {
 	return __gen_orc_route(rt_in, 1);
 }
 
+/* Request a route for the given MO from the OML router */
 int orc_add_route_mo(struct gsm_abis_mo *mo)
 {
 	struct oml_route rt;