iwlwifi: mvm: improve TDLS ch-sw state machine

Add a response-received state and add more limits on allowed requests
in each state of the connection. Previously ch-switch requests from
other peers could interrupt an outgoing active ch-switch. Also stale
packets from the current peer could disrupt the channel switch state.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h
index 7773ffc..fc80b7b 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h
@@ -532,6 +532,7 @@
 enum iwl_mvm_tdls_cs_state {
 	IWL_MVM_TDLS_SW_IDLE = 0,
 	IWL_MVM_TDLS_SW_REQ_SENT,
+	IWL_MVM_TDLS_SW_RESP_RCVD,
 	IWL_MVM_TDLS_SW_REQ_RCVD,
 	IWL_MVM_TDLS_SW_ACTIVE,
 };