ixgbe: DCB: credit max only needs to be gt TSO size for 82598

The maximum credits per traffic class only needs to be greater
then the TSO size for 82598 devices. The 82599 devices do not
have this requirement so only do this test for 82598 devices.
Signed-off-by: NJohn Fastabend <john.r.fastabend@intel.com>
Tested-by: NRoss Brattain <ross.b.brattain@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ixgbe/ixgbe_dcb.c

@@ -42,7 +42,8 @@
  * It should be called only after the rules are checked by
  * ixgbe_dcb_check_config().
  */
-s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_dcb_config *dcb_config,
+s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_hw *hw,
+				   struct ixgbe_dcb_config *dcb_config,
 				   int max_frame, u8 direction)
 {
 	struct tc_bw_alloc *p;
@@ -124,7 +125,8 @@ s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_dcb_config *dcb_config,
 			 * credit may not be enough to send out a TSO
 			 * packet in descriptor plane arbitration.
 			 */
-			if (credit_max &&
+			if ((hw->mac.type == ixgbe_mac_82598EB) &&
+			    credit_max &&
 			    (credit_max < MINIMUM_CREDIT_FOR_TSO))
 				credit_max = MINIMUM_CREDIT_FOR_TSO;
 

drivers/net/ixgbe/ixgbe_dcb.h

@@ -150,7 +150,8 @@ struct ixgbe_dcb_config {
 /* DCB driver APIs */
 
 /* DCB credits calculation */
-s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_dcb_config *, int, u8);
+s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_hw *,
+				   struct ixgbe_dcb_config *, int, u8);
 
 /* DCB hw initialization */
 s32 ixgbe_dcb_hw_config(struct ixgbe_hw *, struct ixgbe_dcb_config *);

drivers/net/ixgbe/ixgbe_main.c

@@ -3366,9 +3366,9 @@ static void ixgbe_configure_dcb(struct ixgbe_adapter *adapter)
 		max_frame = max(max_frame, IXGBE_FCOE_JUMBO_FRAME_SIZE);
 #endif
 
-	ixgbe_dcb_calculate_tc_credits(&adapter->dcb_cfg, max_frame,
+	ixgbe_dcb_calculate_tc_credits(hw, &adapter->dcb_cfg, max_frame,
 					DCB_TX_CONFIG);
-	ixgbe_dcb_calculate_tc_credits(&adapter->dcb_cfg, max_frame,
+	ixgbe_dcb_calculate_tc_credits(hw, &adapter->dcb_cfg, max_frame,
 					DCB_RX_CONFIG);
 
 	/* reconfigure the hardware */