iwlwifi: mvm: skip EBS in low latency mode while fragmented scan isn't supported

While associated in low latency mode, or when traffic load is high,
don't enable EBS in scan request if fragmented EBS is not supported
by the FW.
Signed-off-by: Ayala Beker <ayala.beker@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/file.h

@@ -258,6 +258,7 @@ typedef unsigned int __bitwise iwl_ucode_tlv_api_t;
  *	deprecated.
  * @IWL_UCODE_TLV_API_ADAPTIVE_DWELL_V2: This ucode supports version 8
  *	of scan request: SCAN_REQUEST_CMD_UMAC_API_S_VER_8
+ * @IWL_UCODE_TLV_API_FRAG_EBS: This ucode supports fragmented EBS
  *
  * @NUM_IWL_UCODE_TLV_API: number of bits used
  */
@@ -280,6 +281,7 @@ enum iwl_ucode_tlv_api {
 	IWL_UCODE_TLV_API_QUOTA_LOW_LATENCY	= (__force iwl_ucode_tlv_api_t)38,
 	IWL_UCODE_TLV_API_DEPRECATE_TTAK	= (__force iwl_ucode_tlv_api_t)41,
 	IWL_UCODE_TLV_API_ADAPTIVE_DWELL_V2	= (__force iwl_ucode_tlv_api_t)42,
+	IWL_UCODE_TLV_API_FRAG_EBS		= (__force iwl_ucode_tlv_api_t)44,
 
 	NUM_IWL_UCODE_TLV_API
 #ifdef __CHECKER__

drivers/net/wireless/intel/iwlwifi/mvm/mvm.h

@@ -1245,6 +1245,11 @@ static inline bool iwl_mvm_is_oce_supported(struct iwl_mvm *mvm)
 	return fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_OCE);
 }
 
+static inline bool iwl_mvm_is_frag_ebs_supported(struct iwl_mvm *mvm)
+{
+	return fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_FRAG_EBS);
+}
+
 static inline bool iwl_mvm_enter_d0i3_on_suspend(struct iwl_mvm *mvm)
 {
 	/* For now we only use this mode to differentiate between

drivers/net/wireless/intel/iwlwifi/mvm/scan.c

@@ -836,16 +836,25 @@ static inline bool iwl_mvm_scan_use_ebs(struct iwl_mvm *mvm,
 					struct ieee80211_vif *vif)
 {
 	const struct iwl_ucode_capabilities *capa = &mvm->fw->ucode_capa;
+	bool low_latency;
+
+	if (iwl_mvm_is_cdb_supported(mvm))
+		low_latency = iwl_mvm_low_latency_band(mvm, NL80211_BAND_5GHZ);
+	else
+		low_latency = iwl_mvm_low_latency(mvm);
 
 	/* We can only use EBS if:
 	 *	1. the feature is supported;
 	 *	2. the last EBS was successful;
 	 *	3. if only single scan, the single scan EBS API is supported;
 	 *	4. it's not a p2p find operation.
+	 *	5. we are not in low latency mode,
+	 *	   or if fragmented ebs is supported by the FW
 	 */
 	return ((capa->flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT) &&
 		mvm->last_ebs_successful && IWL_MVM_ENABLE_EBS &&
-		vif->type != NL80211_IFTYPE_P2P_DEVICE);
+		vif->type != NL80211_IFTYPE_P2P_DEVICE &&
+		(!low_latency || iwl_mvm_is_frag_ebs_supported(mvm)));
 }
 
 static inline bool iwl_mvm_is_regular_scan(struct iwl_mvm_scan_params *params)