[dpdk-dev] [PATCH v2] net/i40e: set no drop for traffic class

rory.sexton at intel.com rory.sexton at intel.com
Mon Jan 16 16:52:28 CET 2017

From: Rory Sexton <rory.sexton at intel.com>

The default traffic class in i40e is set to drop versus on ixgbe
it isset to no drop. This means when packets build up in the RX
SRAM on the NIC, they are dropped, and they do this when the SW
descriptor rings fill up.

This patch changes this behaviour and our testing shows there
are no drops as a result.

Signed-off-by: Rory Sexton <rory.sexton at intel.com>
Signed-off-by: Nemanja Marjanovic <nemanja.marjanovic at intel.com>
* Changed to use existing api to set priority register directly.

 drivers/net/i40e/i40e_ethdev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 67778ba..97339b5 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -2985,8 +2985,11 @@ static int
 i40e_priority_flow_ctrl_set(__rte_unused struct rte_eth_dev *dev,
 			    __rte_unused struct rte_eth_pfc_conf *pfc_conf)
+	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	I40E_WRITE_REG(hw, I40E_PRTDCB_TC2PFC, 0xff);
 	return -ENOSYS;

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