wifi: iwlwifi: mvm: refactor TX csum mode check

There are two modes now, and we have two places checking
that must be in sync. Refactor the logic into a new small
helper function.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230413102635.ef6246f4b73b.I44820ec095634dd0bba3007465cf25e4ce1c77c6@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

@@ -6129,10 +6129,7 @@ static bool iwl_mvm_mac_can_aggregate(struct ieee80211_hw *hw,
 {
 	struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 
-	if (mvm->trans->trans_cfg->device_family > IWL_DEVICE_FAMILY_BZ ||
-	    (mvm->trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_BZ &&
-	     !(CSR_HW_REV_TYPE(mvm->trans->hw_rev) == IWL_CFG_MAC_TYPE_GL &&
-	       mvm->trans->hw_rev_step == SILICON_A_STEP)))
+	if (iwl_mvm_has_new_tx_csum(mvm))
 		return iwl_mvm_tx_csum_bz(mvm, head, true) ==
 		       iwl_mvm_tx_csum_bz(mvm, skb, true);
 

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

@@ -1522,6 +1522,19 @@ static inline bool iwl_mvm_is_ctdp_supported(struct iwl_mvm *mvm)
 			   IWL_UCODE_TLV_CAPA_CTDP_SUPPORT);
 }
 
+static inline bool iwl_mvm_has_new_tx_csum(struct iwl_mvm *mvm)
+{
+	if (mvm->trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_BZ)
+		return false;
+
+	if (mvm->trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_BZ &&
+	    CSR_HW_REV_TYPE(mvm->trans->hw_rev) == IWL_CFG_MAC_TYPE_GL &&
+	    mvm->trans->hw_rev_step <= SILICON_B_STEP)
+		return false;
+
+	return true;
+}
+
 extern const u8 iwl_mvm_ac_to_tx_fifo[];
 extern const u8 iwl_mvm_ac_to_gen2_tx_fifo[];
 

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

@@ -184,10 +184,7 @@ static u32 iwl_mvm_tx_csum(struct iwl_mvm *mvm, struct sk_buff *skb,
 			   struct ieee80211_tx_info *info,
 			   bool amsdu)
 {
-	if (mvm->trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_BZ ||
-	    (mvm->trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_BZ &&
-	     CSR_HW_REV_TYPE(mvm->trans->hw_rev) == IWL_CFG_MAC_TYPE_GL &&
-	     mvm->trans->hw_rev_step <= SILICON_B_STEP))
+	if (!iwl_mvm_has_new_tx_csum(mvm))
 		return iwl_mvm_tx_csum_pre_bz(mvm, skb, info, amsdu);
 	return iwl_mvm_tx_csum_bz(mvm, skb, amsdu);
 }