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ixgbe: Fill at least min credits to a TC credit refills 

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.

Change-ID: If652c133093a21e530f4e9eab09097976f57fb12
Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Vasu Dev 2015-11-23 10:30:51 -08:00 committed by Jeff Kirsher
parent 24759daa01
commit 3efcb86e2d
1 changed files with 6 additions and 1 deletions
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7
drivers/net/ethernet/intel/ixgbe/ixgbe_dcb.c
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@ -139,6 +139,11 @@ s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_hw *hw,
/* Calculate credit refill ratio using multiplier */
credit_refill = min(link_percentage * min_multiplier,
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 */
@ -149,7 +154,7 @@ s32 ixgbe_dcb_calculate_tc_credits(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 == DCB_TX_CONFIG) {