paging: Introduce a GSM_PAGING_BUSY event for a special timeout

Start counting the attempts of each paging request and call
the callback with the PAGING_BUSY type when the paging request
timed out but the subscriber was not paged at all. This can
only happen with a huge paging backlog.
In case the system has so many pending paging

3 files changed, 6 insertions, 0 deletions

diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index f42ae1b4a..5badde260 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -83,6 +83,7 @@ enum gsm_paging_event {
 	GSM_PAGING_SUCCEEDED,
 	GSM_PAGING_EXPIRED,
 	GSM_PAGING_OOM,
+	GSM_PAGING_BUSY,
 };
 
 enum bts_gprs_mode {
diff --git a/openbsc/include/openbsc/paging.h b/openbsc/include/openbsc/paging.h
index 68d8a6a95..a78eb8e9d 100644
--- a/openbsc/include/openbsc/paging.h
+++ b/openbsc/include/openbsc/paging.h
@@ -46,6 +46,9 @@ struct gsm_paging_request {
 	/* Timer 3113: how long do we try to page? */
 	struct timer_list T3113;
 
+	/* How often did we ask the BTS to page? */
+	int attempts;
+
 	/* callback to be called in case paging completes */
 	gsm_cbfn *cbfn;
 	void *cbfn_param;
diff --git a/openbsc/include/openbsc/signal.h b/openbsc/include/openbsc/signal.h
index 40766dbf2..fd95c1e82 100644
--- a/openbsc/include/openbsc/signal.h
+++ b/openbsc/include/openbsc/signal.h
@@ -140,6 +140,8 @@ struct paging_signal_data {
 	struct gsm_subscriber *subscr;
 	struct gsm_bts *bts;
 
+	int paging_result;
+
 	/* NULL in case the paging didn't work */
 	struct gsm_subscriber_connection *conn;
 };