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: John Fastabend <john.r.fastabend@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

3 files changed, 8 insertions, 5 deletions

diff --git a/drivers/net/ixgbe/ixgbe_dcb.c b/drivers/net/ixgbe/ixgbe_dcb.c
index 0d44c6470ca3..4f2f0ae67354 100644
--- a/drivers/net/ixgbe/ixgbe_dcb.c
+++ b/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;
 
diff --git a/drivers/net/ixgbe/ixgbe_dcb.h b/drivers/net/ixgbe/ixgbe_dcb.h
index 0208a87b129e..1cfe38ee1644 100644
--- a/drivers/net/ixgbe/ixgbe_dcb.h
+++ b/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 *);
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index f374207e14b4..45d988741fe9 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/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 */