[dpdk-dev] [PATCH 13/52] i40e/base: Add a workaround to drop all flow control frames

[Jingjing Wu]

This patch adds a workaround to drop any flow control frames from being
transmitted from any VSI. FW can still send Flow control frames if Flow
control is enabled.

Signed-off-by: Jingjing Wu <jingjing.wu at intel.com>
---
 drivers/net/i40e/base/i40e_common.c    | 22 ++++++++++++++++++++++
 drivers/net/i40e/base/i40e_prototype.h |  2 ++
 2 files changed, 24 insertions(+)

diff --git a/drivers/net/i40e/base/i40e_common.c 
b/drivers/net/i40e/base/i40e_common.c
index 20dbb07..c21beba 100644
--- a/drivers/net/i40e/base/i40e_common.c
+++ b/drivers/net/i40e/base/i40e_common.c
@@ -4865,6 +4865,28 @@ enum i40e_status_code 
i40e_aq_add_rem_control_packet_filter(struct i40e_hw *hw,
 }

 /**
+ * i40e_add_filter_to_drop_tx_flow_control_frames- filter to drop flow control
+ * @hw: pointer to the hw struct
+ * @seid: VSI seid to add ethertype filter from
+ **/
+#define I40E_FLOW_CONTROL_ETHTYPE 0x8808
+void i40e_add_filter_to_drop_tx_flow_control_frames(struct i40e_hw *hw,
+                                                   u16 seid)
+{
+       u16 flag = I40E_AQC_ADD_CONTROL_PACKET_FLAGS_IGNORE_MAC |
+                  I40E_AQC_ADD_CONTROL_PACKET_FLAGS_DROP |
+                  I40E_AQC_ADD_CONTROL_PACKET_FLAGS_TX;
+       u16 ethtype = I40E_FLOW_CONTROL_ETHTYPE;
+       enum i40e_status_code status;
+
+       status = i40e_aq_add_rem_control_packet_filter(hw, 0, ethtype, flag,
+                                                      seid, 0, true, NULL,
+                                                      NULL);
+       if (status)
+               DEBUGOUT("Ethtype Filter Add failed: Error pruning Tx flow 
control frames\n");
+}
+
+/**
  * i40e_aq_add_cloud_filters
  * @hw: pointer to the hardware structure
  * @seid: VSI seid to add cloud filters from
diff --git a/drivers/net/i40e/base/i40e_prototype.h 
b/drivers/net/i40e/base/i40e_prototype.h
index ee83659..139ff19 100644
--- a/drivers/net/i40e/base/i40e_prototype.h
+++ b/drivers/net/i40e/base/i40e_prototype.h
@@ -459,4 +459,6 @@ enum i40e_status_code 
i40e_aq_add_rem_control_packet_filter(struct i40e_hw *hw,
                                u16 vsi_seid, u16 queue, bool is_add,
                                struct i40e_control_filter_stats *stats,
                                struct i40e_asq_cmd_details *cmd_details);
+void i40e_add_filter_to_drop_tx_flow_control_frames(struct i40e_hw *hw,
+                                                   u16 vsi_seid);
 #endif /* _I40E_PROTOTYPE_H_ */
-- 
2.4.0