stats: Add a stats gauge for the MSC link status.

Change-Id: Ibe4b29056ba704a27b925cfdba49f343ee34f428

3 files changed, 22 insertions, 0 deletions

diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index 11a4b5fc2..e85796cdf 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -1554,6 +1554,10 @@ static const struct rate_ctr_group_desc bsc_ctrg_desc = {
 	bsc_ctr_description,
 };
 
+enum {
+	BSC_STAT_MSC_LINK,
+};
+
 struct gsm_tz {
 	int override; /* if 0, use system's time zone instead. */
 	int hr; /* hour */
@@ -1581,6 +1585,7 @@ struct gsm_network {
 	} hodec2;
 
 	struct rate_ctr_group *bsc_ctrs;
+	struct osmo_stat_item_group *bsc_statg;
 
 	unsigned int num_bts;
 	struct llist_head bts_list;
diff --git a/src/osmo-bsc/a_reset.c b/src/osmo-bsc/a_reset.c
index 3f512781b..9d7be8585 100644
--- a/src/osmo-bsc/a_reset.c
+++ b/src/osmo-bsc/a_reset.c
@@ -71,7 +71,9 @@ static void fsm_disc_cb(struct osmo_fsm_inst *fi, uint32_t event, void *data)
 {
 	struct reset_ctx *reset_ctx = (struct reset_ctx *)fi->priv;
 	OSMO_ASSERT(reset_ctx);
+	struct bsc_msc_data *msc = reset_ctx->priv;
 	LOGPFSML(fi, LOGL_NOTICE, "SIGTRAN connection succeeded.\n");
+	osmo_stat_item_set(msc->network->bsc_statg->items[BSC_STAT_MSC_LINK], 1);
 
 	reset_ctx->conn_loss_counter = 0;
 	osmo_fsm_inst_state_chg(fi, ST_CONN, 0, 0);
@@ -86,7 +88,9 @@ static void fsm_conn_cb(struct osmo_fsm_inst *fi, uint32_t event, void *data)
 	switch (event) {
 	case EV_N_DISCONNECT:
 		if (reset_ctx->conn_loss_counter >= BAD_CONNECTION_THRESOLD) {
+			struct bsc_msc_data *msc = reset_ctx->priv;
 			LOGPFSML(fi, LOGL_NOTICE, "SIGTRAN connection down, reconnecting...\n");
+			osmo_stat_item_set(msc->network->bsc_statg->items[BSC_STAT_MSC_LINK], 0);
 			osmo_fsm_inst_state_chg(fi, ST_DISC, RESET_RESEND_INTERVAL, RESET_RESEND_TIMER_NO);
 		} else
 			reset_ctx->conn_loss_counter++;
diff --git a/src/osmo-bsc/bsc_init.c b/src/osmo-bsc/bsc_init.c
index 18776f33d..9d0ee86f3 100644
--- a/src/osmo-bsc/bsc_init.c
+++ b/src/osmo-bsc/bsc_init.c
@@ -44,6 +44,18 @@
 #include <limits.h>
 #include <stdbool.h>
 
+static const struct osmo_stat_item_desc bsc_stat_desc[] = {
+	{ "msc_link", "MSC link status.", "", 16, 0 },
+};
+
+static const struct osmo_stat_item_group_desc bsc_statg_desc = {
+	.group_name_prefix = "bsc",
+	.group_description = "base station controller",
+	.class_id = OSMO_STATS_CLASS_GLOBAL,
+	.num_items = ARRAY_SIZE(bsc_stat_desc),
+	.item_desc = bsc_stat_desc,
+};
+
 int bsc_shutdown_net(struct gsm_network *net)
 {
 	struct gsm_bts *bts;
@@ -268,6 +280,7 @@ static struct gsm_network *bsc_network_init(void *ctx)
 		talloc_free(net);
 		return NULL;
 	}
+	net->bsc_statg = osmo_stat_item_group_alloc(net, &bsc_statg_desc, 0);
 
 	INIT_LLIST_HEAD(&net->bts_rejected);
 	gsm_net_update_ctype(net);