i40e: implement and use Rx CTL helper functions

Use the new AdminQ functions for safely accessing the Rx control
registers that may be affected by heavy small packet traffic.

Change-ID: Ibb00983e8dcba71f4b760222a609a5fcaa726f18
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

4 files changed, 266 insertions, 3 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index 3a57e59..74d9599 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -1328,7 +1328,7 @@ void i40e_clear_hw(struct i40e_hw *hw)
 	num_vf_int = (val & I40E_GLPCI_CNF2_MSI_X_VF_N_MASK) >>
 		     I40E_GLPCI_CNF2_MSI_X_VF_N_SHIFT;
 
-	val = rd32(hw, I40E_PFLAN_QALLOC);
+	val = i40e_read_rx_ctl(hw, I40E_PFLAN_QALLOC);
 	base_queue = (val & I40E_PFLAN_QALLOC_FIRSTQ_MASK) >>
 		     I40E_PFLAN_QALLOC_FIRSTQ_SHIFT;
 	j = (val & I40E_PFLAN_QALLOC_LASTQ_MASK) >>
@@ -3882,7 +3882,7 @@ i40e_status i40e_set_filter_control(struct i40e_hw *hw,
 		return ret;
 
 	/* Read the PF Queue Filter control register */
-	val = rd32(hw, I40E_PFQF_CTL_0);
+	val = i40e_read_rx_ctl(hw, I40E_PFQF_CTL_0);
 
 	/* Program required PE hash buckets for the PF */
 	val &= ~I40E_PFQF_CTL_0_PEHSIZE_MASK;
@@ -3919,7 +3919,7 @@ i40e_status i40e_set_filter_control(struct i40e_hw *hw,
 	if (settings->enable_macvlan)
 		val |= I40E_PFQF_CTL_0_MACVLAN_ENA_MASK;
 
-	wr32(hw, I40E_PFQF_CTL_0, val);
+	i40e_write_rx_ctl(hw, I40E_PFQF_CTL_0, val);
 
 	return 0;
 }
@@ -4575,3 +4575,125 @@ restore_config:
 					 phy_addr, led_ctl);
 	return status;
 }
+
+/**
+ * i40e_aq_rx_ctl_read_register - use FW to read from an Rx control register
+ * @hw: pointer to the hw struct
+ * @reg_addr: register address
+ * @reg_val: ptr to register value
+ * @cmd_details: pointer to command details structure or NULL
+ *
+ * Use the firmware to read the Rx control register,
+ * especially useful if the Rx unit is under heavy pressure
+ **/
+i40e_status i40e_aq_rx_ctl_read_register(struct i40e_hw *hw,
+				u32 reg_addr, u32 *reg_val,
+				struct i40e_asq_cmd_details *cmd_details)
+{
+	struct i40e_aq_desc desc;
+	struct i40e_aqc_rx_ctl_reg_read_write *cmd_resp =
+		(struct i40e_aqc_rx_ctl_reg_read_write *)&desc.params.raw;
+	i40e_status status;
+
+	if (!reg_val)
+		return I40E_ERR_PARAM;
+
+	i40e_fill_default_direct_cmd_desc(&desc, i40e_aqc_opc_rx_ctl_reg_read);
+
+	cmd_resp->address = cpu_to_le32(reg_addr);
+
+	status = i40e_asq_send_command(hw, &desc, NULL, 0, cmd_details);
+
+	if (status == 0)
+		*reg_val = le32_to_cpu(cmd_resp->value);
+
+	return status;
+}
+
+/**
+ * i40e_read_rx_ctl - read from an Rx control register
+ * @hw: pointer to the hw struct
+ * @reg_addr: register address
+ **/
+u32 i40e_read_rx_ctl(struct i40e_hw *hw, u32 reg_addr)
+{
+	i40e_status status = 0;
+	bool use_register;
+	int retry = 5;
+	u32 val = 0;
+
+	use_register = (hw->aq.api_maj_ver == 1) && (hw->aq.api_min_ver < 5);
+	if (!use_register) {
+do_retry:
+		status = i40e_aq_rx_ctl_read_register(hw, reg_addr, &val, NULL);
+		if (hw->aq.asq_last_status == I40E_AQ_RC_EAGAIN && retry) {
+			usleep_range(1000, 2000);
+			retry--;
+			goto do_retry;
+		}
+	}
+
+	/* if the AQ access failed, try the old-fashioned way */
+	if (status || use_register)
+		val = rd32(hw, reg_addr);
+
+	return val;
+}
+
+/**
+ * i40e_aq_rx_ctl_write_register
+ * @hw: pointer to the hw struct
+ * @reg_addr: register address
+ * @reg_val: register value
+ * @cmd_details: pointer to command details structure or NULL
+ *
+ * Use the firmware to write to an Rx control register,
+ * especially useful if the Rx unit is under heavy pressure
+ **/
+i40e_status i40e_aq_rx_ctl_write_register(struct i40e_hw *hw,
+				u32 reg_addr, u32 reg_val,
+				struct i40e_asq_cmd_details *cmd_details)
+{
+	struct i40e_aq_desc desc;
+	struct i40e_aqc_rx_ctl_reg_read_write *cmd =
+		(struct i40e_aqc_rx_ctl_reg_read_write *)&desc.params.raw;
+	i40e_status status;
+
+	i40e_fill_default_direct_cmd_desc(&desc, i40e_aqc_opc_rx_ctl_reg_write);
+
+	cmd->address = cpu_to_le32(reg_addr);
+	cmd->value = cpu_to_le32(reg_val);
+
+	status = i40e_asq_send_command(hw, &desc, NULL, 0, cmd_details);
+
+	return status;
+}
+
+/**
+ * i40e_write_rx_ctl - write to an Rx control register
+ * @hw: pointer to the hw struct
+ * @reg_addr: register address
+ * @reg_val: register value
+ **/
+void i40e_write_rx_ctl(struct i40e_hw *hw, u32 reg_addr, u32 reg_val)
+{
+	i40e_status status = 0;
+	bool use_register;
+	int retry = 5;
+
+	use_register = (hw->aq.api_maj_ver == 1) && (hw->aq.api_min_ver < 5);
+	if (!use_register) {
+do_retry:
+		status = i40e_aq_rx_ctl_write_register(hw, reg_addr,
+						       reg_val, NULL);
+		if (hw->aq.asq_last_status == I40E_AQ_RC_EAGAIN && retry) {
+			usleep_range(1000, 2000);
+			retry--;
+			goto do_retry;
+		}
+	}
+
+	/* if the AQ access failed, try the old-fashioned way */
+	if (status || use_register)
+		wr32(hw, reg_addr, reg_val);
+}
diff --git a/drivers/net/ethernet/intel/i40e/i40e_prototype.h b/drivers/net/ethernet/intel/i40e/i40e_prototype.h
index ca2f7ac..d51eee5 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_prototype.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_prototype.h
@@ -342,6 +342,14 @@ i40e_status i40e_aq_debug_dump(struct i40e_hw *hw, u8 cluster_id,
 			       struct i40e_asq_cmd_details *cmd_details);
 void i40e_add_filter_to_drop_tx_flow_control_frames(struct i40e_hw *hw,
 						    u16 vsi_seid);
+i40e_status i40e_aq_rx_ctl_read_register(struct i40e_hw *hw,
+				u32 reg_addr, u32 *reg_val,
+				struct i40e_asq_cmd_details *cmd_details);
+u32 i40e_read_rx_ctl(struct i40e_hw *hw, u32 reg_addr);
+i40e_status i40e_aq_rx_ctl_write_register(struct i40e_hw *hw,
+				u32 reg_addr, u32 reg_val,
+				struct i40e_asq_cmd_details *cmd_details);
+void i40e_write_rx_ctl(struct i40e_hw *hw, u32 reg_addr, u32 reg_val);
 i40e_status i40e_read_phy_register(struct i40e_hw *hw, u8 page,
 				   u16 reg, u8 phy_addr, u16 *value);
 i40e_status i40e_write_phy_register(struct i40e_hw *hw, u8 page,
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_common.c b/drivers/net/ethernet/intel/i40evf/i40e_common.c
index 938783e..771ac6a 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40evf/i40e_common.c
@@ -904,6 +904,131 @@ struct i40e_rx_ptype_decoded i40evf_ptype_lookup[] = {
 };
 
 /**
+ * i40evf_aq_rx_ctl_read_register - use FW to read from an Rx control register
+ * @hw: pointer to the hw struct
+ * @reg_addr: register address
+ * @reg_val: ptr to register value
+ * @cmd_details: pointer to command details structure or NULL
+ *
+ * Use the firmware to read the Rx control register,
+ * especially useful if the Rx unit is under heavy pressure
+ **/
+i40e_status i40evf_aq_rx_ctl_read_register(struct i40e_hw *hw,
+				u32 reg_addr, u32 *reg_val,
+				struct i40e_asq_cmd_details *cmd_details)
+{
+	struct i40e_aq_desc desc;
+	struct i40e_aqc_rx_ctl_reg_read_write *cmd_resp =
+		(struct i40e_aqc_rx_ctl_reg_read_write *)&desc.params.raw;
+	i40e_status status;
+
+	if (!reg_val)
+		return I40E_ERR_PARAM;
+
+	i40evf_fill_default_direct_cmd_desc(&desc,
+					    i40e_aqc_opc_rx_ctl_reg_read);
+
+	cmd_resp->address = cpu_to_le32(reg_addr);
+
+	status = i40evf_asq_send_command(hw, &desc, NULL, 0, cmd_details);
+
+	if (status == 0)
+		*reg_val = le32_to_cpu(cmd_resp->value);
+
+	return status;
+}
+
+/**
+ * i40evf_read_rx_ctl - read from an Rx control register
+ * @hw: pointer to the hw struct
+ * @reg_addr: register address
+ **/
+u32 i40evf_read_rx_ctl(struct i40e_hw *hw, u32 reg_addr)
+{
+	i40e_status status = 0;
+	bool use_register;
+	int retry = 5;
+	u32 val = 0;
+
+	use_register = (hw->aq.api_maj_ver == 1) && (hw->aq.api_min_ver < 5);
+	if (!use_register) {
+do_retry:
+		status = i40evf_aq_rx_ctl_read_register(hw, reg_addr,
+							&val, NULL);
+		if (hw->aq.asq_last_status == I40E_AQ_RC_EAGAIN && retry) {
+			usleep_range(1000, 2000);
+			retry--;
+			goto do_retry;
+		}
+	}
+
+	/* if the AQ access failed, try the old-fashioned way */
+	if (status || use_register)
+		val = rd32(hw, reg_addr);
+
+	return val;
+}
+
+/**
+ * i40evf_aq_rx_ctl_write_register
+ * @hw: pointer to the hw struct
+ * @reg_addr: register address
+ * @reg_val: register value
+ * @cmd_details: pointer to command details structure or NULL
+ *
+ * Use the firmware to write to an Rx control register,
+ * especially useful if the Rx unit is under heavy pressure
+ **/
+i40e_status i40evf_aq_rx_ctl_write_register(struct i40e_hw *hw,
+				u32 reg_addr, u32 reg_val,
+				struct i40e_asq_cmd_details *cmd_details)
+{
+	struct i40e_aq_desc desc;
+	struct i40e_aqc_rx_ctl_reg_read_write *cmd =
+		(struct i40e_aqc_rx_ctl_reg_read_write *)&desc.params.raw;
+	i40e_status status;
+
+	i40evf_fill_default_direct_cmd_desc(&desc,
+					    i40e_aqc_opc_rx_ctl_reg_write);
+
+	cmd->address = cpu_to_le32(reg_addr);
+	cmd->value = cpu_to_le32(reg_val);
+
+	status = i40evf_asq_send_command(hw, &desc, NULL, 0, cmd_details);
+
+	return status;
+}
+
+/**
+ * i40evf_write_rx_ctl - write to an Rx control register
+ * @hw: pointer to the hw struct
+ * @reg_addr: register address
+ * @reg_val: register value
+ **/
+void i40evf_write_rx_ctl(struct i40e_hw *hw, u32 reg_addr, u32 reg_val)
+{
+	i40e_status status = 0;
+	bool use_register;
+	int retry = 5;
+
+	use_register = (hw->aq.api_maj_ver == 1) && (hw->aq.api_min_ver < 5);
+	if (!use_register) {
+do_retry:
+		status = i40evf_aq_rx_ctl_write_register(hw, reg_addr,
+							 reg_val, NULL);
+		if (hw->aq.asq_last_status == I40E_AQ_RC_EAGAIN && retry) {
+			usleep_range(1000, 2000);
+			retry--;
+			goto do_retry;
+		}
+	}
+
+	/* if the AQ access failed, try the old-fashioned way */
+	if (status || use_register)
+		wr32(hw, reg_addr, reg_val);
+}
+
+/**
  * i40e_aq_send_msg_to_pf
  * @hw: pointer to the hardware structure
  * @v_opcode: opcodes for VF-PF communication
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_prototype.h b/drivers/net/ethernet/intel/i40evf/i40e_prototype.h
index fa34d85..d89d521 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_prototype.h
+++ b/drivers/net/ethernet/intel/i40evf/i40e_prototype.h
@@ -103,6 +103,14 @@ i40e_status i40e_aq_add_rem_control_packet_filter(struct i40e_hw *hw,
 				struct i40e_asq_cmd_details *cmd_details);
 void i40e_add_filter_to_drop_tx_flow_control_frames(struct i40e_hw *hw,
 						    u16 vsi_seid);
+i40e_status i40evf_aq_rx_ctl_read_register(struct i40e_hw *hw,
+				u32 reg_addr, u32 *reg_val,
+				struct i40e_asq_cmd_details *cmd_details);
+u32 i40evf_read_rx_ctl(struct i40e_hw *hw, u32 reg_addr);
+i40e_status i40evf_aq_rx_ctl_write_register(struct i40e_hw *hw,
+				u32 reg_addr, u32 reg_val,
+				struct i40e_asq_cmd_details *cmd_details);
+void i40evf_write_rx_ctl(struct i40e_hw *hw, u32 reg_addr, u32 reg_val);
 i40e_status i40e_read_phy_register(struct i40e_hw *hw, u8 page,
 				   u16 reg, u8 phy_addr, u16 *value);
 i40e_status i40e_write_phy_register(struct i40e_hw *hw, u8 page,