i40e/base: add workaround to drop all flow control frames

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@intel.com>
Acked-by: Helin Zhang <helin.zhang@intel.com>
Tested-by: Huilong Xu <huilongx.xu@intel.com>

diff --git a/drivers/net/i40e/base/i40e_common.c b/drivers/net/i40e/base/i40e_common.c
index d44639a..9ae90c0 100644 (file)
--- a/drivers/net/i40e/base/i40e_common.c
+++ b/drivers/net/i40e/base/i40e_common.c
@@ -4898,6 +4898,28 @@ enum i40e_status_code i40e_aq_add_rem_control_packet_filter(struct i40e_hw *hw,
        return status;
 }
 
+/**
+ * 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

diff --git a/drivers/net/i40e/base/i40e_prototype.h b/drivers/net/i40e/base/i40e_prototype.h
index 5b6f1fb..1d4aeff 100644 (file)
--- a/drivers/net/i40e/base/i40e_prototype.h
+++ b/drivers/net/i40e/base/i40e_prototype.h
@@ -468,4 +468,6 @@ 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_ */