ixgbe/base: fix Tx hang in CEE mode

Currently credit_refill and credit_max could be zero for a TC and that
is causing Tx hang for CEE mode configuration, so to fix that have at
min credit assigned to a TC and that is as what IEEE mode already does.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>

diff --git a/drivers/net/ixgbe/base/ixgbe_dcb.c b/drivers/net/ixgbe/base/ixgbe_dcb.c
index dce9e9a..29d7889 100644 (file)
--- a/drivers/net/ixgbe/base/ixgbe_dcb.c
+++ b/drivers/net/ixgbe/base/ixgbe_dcb.c
@@ -147,6 +147,11 @@ s32 ixgbe_dcb_calculate_tc_credits_cee(struct ixgbe_hw *hw,
                /* Calculate credit refill ratio using multiplier */
                credit_refill = min(link_percentage * min_multiplier,
                                    (u32)IXGBE_DCB_MAX_CREDIT_REFILL);
+
+               /* Refill at least minimum credit */
+               if (credit_refill < min_credit)
+                       credit_refill = min_credit;
+
                p->data_credits_refill = (u16)credit_refill;
 
                /* Calculate maximum credit for the TC */
@@ -157,7 +162,7 @@ s32 ixgbe_dcb_calculate_tc_credits_cee(struct ixgbe_hw *hw,
                 * of a TC is too small, the maximum credit may not be
                 * enough to send out a jumbo frame in data plane arbitration.
                 */
-               if (credit_max && (credit_max < min_credit))
+               if (credit_max < min_credit)
                        credit_max = min_credit;
 
                if (direction == IXGBE_DCB_TX_CONFIG) {
@@ -369,8 +374,6 @@ s32 ixgbe_dcb_check_config_cee(struct ixgbe_dcb_config *dcb_config)
        }
 
 err_config:
-       DEBUGOUT2("DCB error code %d while checking %s settings.\n",
-                 ret_val, (i == IXGBE_DCB_TX_CONFIG) ? "Tx" : "Rx");
 
        return ret_val;
 }