qcacld-3.0: SAP in CAC, block concurrency

At the time of starting / stopping 2nd or 3rd connection,
Host sends WMI_PDEV_SET_HW_CMDID command to FW to change
HW mode to DBS / Single-Mac based on concurrency rule.
FW upon receiving this command turns off TXRX chainmask
which means that radar pulses might get missed for
20ms - 50ms during CAC period. To fix this, Host should
block new connection when existing SAP is performing CAC
on DFS channel.

Change-Id: I51eb117afa763a6ef54211808875419026c9075b
CRs-Fixed: 2533717

cmn_services/policy_mgr/inc/wlan_policy_mgr_api.h

@@ -1309,6 +1309,7 @@ struct policy_mgr_hdd_cbacks {
 	enum QDF_OPMODE (*hdd_get_device_mode)(uint32_t session_id);
 	bool (*hdd_wapi_security_sta_exist)(void);
 	bool (*hdd_is_chan_switch_in_progress)(void);
+	bool (*hdd_is_cac_in_progress)(void);
 	void (*wlan_hdd_set_sap_csa_reason)(struct wlan_objmgr_psoc *psoc,
 					    uint8_t vdev_id, uint8_t reason);
 };

cmn_services/policy_mgr/src/wlan_policy_mgr_action.c

@@ -165,6 +165,17 @@ QDF_STATUS policy_mgr_pdev_set_hw_mode(struct wlan_objmgr_psoc *psoc,
 		return QDF_STATUS_E_FAILURE;
 	}
 
+	/* Don't send WMI_PDEV_SET_HW_MODE_CMDID to FW if existing SAP / GO is
+	 * in CAC-in-progress state. Host is blocking this command as FW is
+	 * having design limitation and FW don't expect this command when CAC
+	 * is in progress state.
+	 */
+	if (pm_ctx->hdd_cbacks.hdd_is_cac_in_progress &&
+	    pm_ctx->hdd_cbacks.hdd_is_cac_in_progress()) {
+		policy_mgr_err("SAP CAC_IN_PROGRESS state, drop WMI_PDEV_SET_HW_MODE_CMDID");
+		return QDF_STATUS_E_FAILURE;
+	}
+
 	msg.hw_mode_index = hw_mode_index;
 	msg.set_hw_mode_cb = (void *)policy_mgr_pdev_set_hw_mode_cb;
 	msg.reason = reason;

cmn_services/policy_mgr/src/wlan_policy_mgr_core.c

@@ -1464,6 +1464,7 @@ void pm_dbs_opportunistic_timer_handler(void *data)
 	uint32_t session_id;
 	struct wlan_objmgr_psoc *psoc = (struct wlan_objmgr_psoc *)data;
 	enum policy_mgr_conn_update_reason reason;
+	struct policy_mgr_psoc_priv_obj *pm_ctx = policy_mgr_get_context(psoc);
 
 	if (!psoc) {
 		policy_mgr_err("Invalid Context");
@@ -1473,8 +1474,14 @@ void pm_dbs_opportunistic_timer_handler(void *data)
 	/* if we still need it */
 	action = policy_mgr_need_opportunistic_upgrade(psoc, &reason);
 	policy_mgr_debug("action:%d", action);
-	if (!action)
+	if (!action) {
 		return;
+	} else if (pm_ctx->hdd_cbacks.hdd_is_cac_in_progress &&
+		   pm_ctx->hdd_cbacks.hdd_is_cac_in_progress()) {
+		policy_mgr_debug("SAP is in CAC_IN_PROGRESS state, restarting");
+		policy_mgr_restart_opportunistic_timer(psoc, false);
+		return;
+	}
 	session_id = pm_get_vdev_id_of_first_conn_idx(psoc);
 	policy_mgr_next_actions(psoc, session_id, action,
 				reason);

cmn_services/policy_mgr/src/wlan_policy_mgr_init_deinit.c

@@ -610,6 +610,8 @@ QDF_STATUS policy_mgr_register_hdd_cb(struct wlan_objmgr_psoc *psoc,
 		hdd_cbacks->hdd_wapi_security_sta_exist;
 	pm_ctx->hdd_cbacks.hdd_is_chan_switch_in_progress =
 		hdd_cbacks->hdd_is_chan_switch_in_progress;
+	pm_ctx->hdd_cbacks.hdd_is_cac_in_progress =
+		hdd_cbacks->hdd_is_cac_in_progress;
 
 	return QDF_STATUS_SUCCESS;
 }
@@ -628,6 +630,8 @@ QDF_STATUS policy_mgr_deregister_hdd_cb(struct wlan_objmgr_psoc *psoc)
 	pm_ctx->hdd_cbacks.wlan_hdd_get_channel_for_sap_restart = NULL;
 	pm_ctx->hdd_cbacks.get_mode_for_non_connected_vdev = NULL;
 	pm_ctx->hdd_cbacks.hdd_get_device_mode = NULL;
+	pm_ctx->hdd_cbacks.hdd_is_chan_switch_in_progress = NULL;
+	pm_ctx->hdd_cbacks.hdd_is_cac_in_progress = NULL;
 
 	return QDF_STATUS_SUCCESS;
 }