mgcp_client_endpoint_fsm: on term, still let conns wait for DLCX OK
When the mgcp_client_endpoint_fsm terminates, do not directly pull each conn FSM instance (mgcp_client_fsm) into oblivion as well. Those should emit a DLCX and wait for the "OK" response before deallocating. In programs using the mgcp client endpoint FSM (osmo-bsc, osmo-msc), this gets rid of false LMGCP ERROR logging related to DLCX like this: Cannot find matching MGCP transaction for trans_id 71998 Related: SYS#5529 Change-Id: I8fbfec5533e9be9cc7ea550df1e6639a0a215973
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@ -990,6 +990,34 @@ static int osmo_mgcpc_ep_fsm_timer_cb(struct osmo_fsm_inst *fi)
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return 0;
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}
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void osmo_mgcpc_ep_fsm_pre_term(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause)
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{
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int i;
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struct osmo_mgcpc_ep *ep = osmo_mgcpc_ep_fi_mgwep(fi);
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/* We want the mgcp_client_fsm to still stick around until it received the DLCX "OK" responses from the MGW. So
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* it should not dealloc along with this ep_fsm instance. Instead, signal DLCX for each conn on the endpoint,
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* and detach the mgcp_client_fsm from being a child-fsm.
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*
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* After mgcp_conn_delete(), an mgcp_client_fsm instance goes into ST_DLCX_RESP, which waits up to 4 seconds for
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* a DLCX OK. If none is received in that time, the instance terminates. So cleanup of the instance is
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* guaranteed. */
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for (i = 0; i < ARRAY_SIZE(ep->ci); i++) {
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struct osmo_mgcpc_ep_ci *ci = &ep->ci[i];
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if (!ci->occupied || !ci->mgcp_client_fi)
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continue;
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/* mgcp_conn_delete() unlinks itself from this parent FSM implicitly and waits for the DLCX OK. */
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mgcp_conn_delete(ci->mgcp_client_fi);
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/* Forget all about this ci */
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*ci = (struct osmo_mgcpc_ep_ci){
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.ep = ep,
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};
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}
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}
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static struct osmo_fsm osmo_mgcpc_ep_fsm = {
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.name = "mgw-endp",
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.states = osmo_mgcpc_ep_fsm_states,
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@ -997,5 +1025,5 @@ static struct osmo_fsm osmo_mgcpc_ep_fsm = {
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.log_subsys = DLMGCP,
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.event_names = osmo_mgcpc_ep_fsm_event_names,
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.timer_cb = osmo_mgcpc_ep_fsm_timer_cb,
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/* The FSM termination will automatically trigger any mgcp_client_fsm instances to DLCX. */
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.pre_term = osmo_mgcpc_ep_fsm_pre_term,
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};
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