i40e: Further implementation of LLDP

This code implements driver code changes necessary for LLDP
Agent support. Modified i40e_aq_start_lldp() and
i40e_aq_stop_lldp() adding false parameter whether LLDP state
should be persistent across power cycles.
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_adminq.c

@@ -608,6 +608,11 @@ i40e_status i40e_init_adminq(struct i40e_hw *hw)
 	     hw->aq.api_min_ver >= 7))
 		hw->flags |= I40E_HW_FLAG_802_1AD_CAPABLE;
 
+	if (hw->aq.api_maj_ver > 1 ||
+	    (hw->aq.api_maj_ver == 1 &&
+	     hw->aq.api_min_ver >= 8))
+		hw->flags |= I40E_HW_FLAG_FW_LLDP_PERSISTENT;
+
 	if (hw->aq.api_maj_ver > I40E_FW_API_VERSION_MAJOR) {
 		ret_code = I40E_ERR_FIRMWARE_API_VERSION;
 		goto init_adminq_free_arq;

drivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h

@@ -261,6 +261,7 @@ enum i40e_admin_queue_opc {
 	i40e_aqc_opc_get_cee_dcb_cfg	= 0x0A07,
 	i40e_aqc_opc_lldp_set_local_mib	= 0x0A08,
 	i40e_aqc_opc_lldp_stop_start_spec_agent	= 0x0A09,
+	i40e_aqc_opc_lldp_restore		= 0x0A0A,
 
 	/* Tunnel commands */
 	i40e_aqc_opc_add_udp_tunnel	= 0x0B00,
@@ -2500,16 +2501,17 @@ struct i40e_aqc_lldp_stop {
 	u8	command;
 #define I40E_AQ_LLDP_AGENT_STOP			0x0
 #define I40E_AQ_LLDP_AGENT_SHUTDOWN		0x1
+#define I40E_AQ_LLDP_AGENT_STOP_PERSIST		0x2
 	u8	reserved[15];
 };
 
 I40E_CHECK_CMD_LENGTH(i40e_aqc_lldp_stop);
 
 /* Start LLDP (direct 0x0A06) */
-
 struct i40e_aqc_lldp_start {
 	u8	command;
 #define I40E_AQ_LLDP_AGENT_START		0x1
+#define I40E_AQ_LLDP_AGENT_START_PERSIST	0x2
 	u8	reserved[15];
 };
 
@@ -2633,6 +2635,16 @@ struct i40e_aqc_lldp_stop_start_specific_agent {
 
 I40E_CHECK_CMD_LENGTH(i40e_aqc_lldp_stop_start_specific_agent);
 
+/* Restore LLDP Agent factory settings (direct 0x0A0A) */
+struct i40e_aqc_lldp_restore {
+	u8	command;
+#define I40E_AQ_LLDP_AGENT_RESTORE_NOT		0x0
+#define I40E_AQ_LLDP_AGENT_RESTORE		0x1
+	u8	reserved[15];
+};
+
+I40E_CHECK_CMD_LENGTH(i40e_aqc_lldp_restore);
+
 /* Add Udp Tunnel command and completion (direct 0x0B00) */
 struct i40e_aqc_add_udp_tunnel {
 	__le16	udp_port;

drivers/net/ethernet/intel/i40e/i40e_common.c

@@ -3623,15 +3623,55 @@ i40e_status i40e_aq_cfg_lldp_mib_change_event(struct i40e_hw *hw,
 	return status;
 }
 
+/**
+ * i40e_aq_restore_lldp
+ * @hw: pointer to the hw struct
+ * @setting: pointer to factory setting variable or NULL
+ * @restore: True if factory settings should be restored
+ * @cmd_details: pointer to command details structure or NULL
+ *
+ * Restore LLDP Agent factory settings if @restore set to True. In other case
+ * only returns factory setting in AQ response.
+ **/
+enum i40e_status_code
+i40e_aq_restore_lldp(struct i40e_hw *hw, u8 *setting, bool restore,
+		     struct i40e_asq_cmd_details *cmd_details)
+{
+	struct i40e_aq_desc desc;
+	struct i40e_aqc_lldp_restore *cmd =
+		(struct i40e_aqc_lldp_restore *)&desc.params.raw;
+	i40e_status status;
+
+	if (!(hw->flags & I40E_HW_FLAG_FW_LLDP_PERSISTENT)) {
+		i40e_debug(hw, I40E_DEBUG_ALL,
+			   "Restore LLDP not supported by current FW version.\n");
+		return I40E_ERR_DEVICE_NOT_SUPPORTED;
+	}
+
+	i40e_fill_default_direct_cmd_desc(&desc, i40e_aqc_opc_lldp_restore);
+
+	if (restore)
+		cmd->command |= I40E_AQ_LLDP_AGENT_RESTORE;
+
+	status = i40e_asq_send_command(hw, &desc, NULL, 0, cmd_details);
+
+	if (setting)
+		*setting = cmd->command & 1;
+
+	return status;
+}
+
 /**
  * i40e_aq_stop_lldp
  * @hw: pointer to the hw struct
  * @shutdown_agent: True if LLDP Agent needs to be Shutdown
+ * @persist: True if stop of LLDP should be persistent across power cycles
  * @cmd_details: pointer to command details structure or NULL
  *
  * Stop or Shutdown the embedded LLDP Agent
  **/
 i40e_status i40e_aq_stop_lldp(struct i40e_hw *hw, bool shutdown_agent,
+				bool persist,
 				struct i40e_asq_cmd_details *cmd_details)
 {
 	struct i40e_aq_desc desc;
@@ -3644,6 +3684,14 @@ i40e_status i40e_aq_stop_lldp(struct i40e_hw *hw, bool shutdown_agent,
 	if (shutdown_agent)
 		cmd->command |= I40E_AQ_LLDP_AGENT_SHUTDOWN;
 
+	if (persist) {
+		if (hw->flags & I40E_HW_FLAG_FW_LLDP_PERSISTENT)
+			cmd->command |= I40E_AQ_LLDP_AGENT_STOP_PERSIST;
+		else
+			i40e_debug(hw, I40E_DEBUG_ALL,
+				   "Persistent Stop LLDP not supported by current FW version.\n");
+	}
+
 	status = i40e_asq_send_command(hw, &desc, NULL, 0, cmd_details);
 
 	return status;
@@ -3653,12 +3701,13 @@ i40e_status i40e_aq_stop_lldp(struct i40e_hw *hw, bool shutdown_agent,
  * i40e_aq_start_lldp
  * @hw: pointer to the hw struct
  * @buff: buffer for result
+ * @persist: True if start of LLDP should be persistent across power cycles
  * @buff_size: buffer size
  * @cmd_details: pointer to command details structure or NULL
  *
  * Start the embedded LLDP Agent on all ports.
  **/
-i40e_status i40e_aq_start_lldp(struct i40e_hw *hw,
+i40e_status i40e_aq_start_lldp(struct i40e_hw *hw, bool persist,
 			       struct i40e_asq_cmd_details *cmd_details)
 {
 	struct i40e_aq_desc desc;
@@ -3669,6 +3718,15 @@ i40e_status i40e_aq_start_lldp(struct i40e_hw *hw,
 	i40e_fill_default_direct_cmd_desc(&desc, i40e_aqc_opc_lldp_start);
 
 	cmd->command = I40E_AQ_LLDP_AGENT_START;
+
+	if (persist) {
+		if (hw->flags & I40E_HW_FLAG_FW_LLDP_PERSISTENT)
+			cmd->command |= I40E_AQ_LLDP_AGENT_START_PERSIST;
+		else
+			i40e_debug(hw, I40E_DEBUG_ALL,
+				   "Persistent Start LLDP not supported by current FW version.\n");
+	}
+
 	status = i40e_asq_send_command(hw, &desc, NULL, 0, cmd_details);
 
 	return status;

drivers/net/ethernet/intel/i40e/i40e_debugfs.c

@@ -1321,7 +1321,7 @@ static ssize_t i40e_dbg_command_write(struct file *filp,
 		if (strncmp(&cmd_buf[5], "stop", 4) == 0) {
 			int ret;
 
-			ret = i40e_aq_stop_lldp(&pf->hw, false, NULL);
+			ret = i40e_aq_stop_lldp(&pf->hw, false, false, NULL);
 			if (ret) {
 				dev_info(&pf->pdev->dev,
 					 "Stop LLDP AQ command failed =0x%x\n",
@@ -1358,7 +1358,7 @@ static ssize_t i40e_dbg_command_write(struct file *filp,
 				/* Continue and start FW LLDP anyways */
 			}
 
-			ret = i40e_aq_start_lldp(&pf->hw, NULL);
+			ret = i40e_aq_start_lldp(&pf->hw, false, NULL);
 			if (ret) {
 				dev_info(&pf->pdev->dev,
 					 "Start LLDP AQ command failed =0x%x\n",

drivers/net/ethernet/intel/i40e/i40e_ethtool.c

@@ -4958,7 +4958,7 @@ static int i40e_set_priv_flags(struct net_device *dev, u32 flags)
 		if (pf->flags & I40E_FLAG_DISABLE_FW_LLDP) {
 			struct i40e_dcbx_config *dcbcfg;
 
-			i40e_aq_stop_lldp(&pf->hw, true, NULL);
+			i40e_aq_stop_lldp(&pf->hw, true, false, NULL);
 			i40e_aq_set_dcb_parameters(&pf->hw, true, NULL);
 			/* reset local_dcbx_config to default */
 			dcbcfg = &pf->hw.local_dcbx_config;
@@ -4973,7 +4973,7 @@ static int i40e_set_priv_flags(struct net_device *dev, u32 flags)
 			dcbcfg->pfc.willing = 1;
 			dcbcfg->pfc.pfccap = I40E_MAX_TRAFFIC_CLASS;
 		} else {
-			i40e_aq_start_lldp(&pf->hw, NULL);
+			i40e_aq_start_lldp(&pf->hw, false, NULL);
 		}
 	}
 

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -14132,7 +14132,7 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	 */
 	if (pf->hw_features & I40E_HW_STOP_FW_LLDP) {
 		dev_info(&pdev->dev, "Stopping firmware LLDP agent.\n");
-		i40e_aq_stop_lldp(hw, true, NULL);
+		i40e_aq_stop_lldp(hw, true, false, NULL);
 	}
 
 	/* allow a platform config to override the HW addr */

drivers/net/ethernet/intel/i40e/i40e_prototype.h

@@ -203,13 +203,17 @@ i40e_status i40e_aq_get_lldp_mib(struct i40e_hw *hw, u8 bridge_type,
 i40e_status i40e_aq_cfg_lldp_mib_change_event(struct i40e_hw *hw,
 				bool enable_update,
 				struct i40e_asq_cmd_details *cmd_details);
+enum i40e_status_code
+i40e_aq_restore_lldp(struct i40e_hw *hw, u8 *setting, bool restore,
+		     struct i40e_asq_cmd_details *cmd_details);
 i40e_status i40e_aq_stop_lldp(struct i40e_hw *hw, bool shutdown_agent,
+			      bool persist,
 				struct i40e_asq_cmd_details *cmd_details);
 i40e_status i40e_aq_set_dcb_parameters(struct i40e_hw *hw,
 				       bool dcb_enable,
 				       struct i40e_asq_cmd_details
 				       *cmd_details);
-i40e_status i40e_aq_start_lldp(struct i40e_hw *hw,
+i40e_status i40e_aq_start_lldp(struct i40e_hw *hw, bool persist,
 			       struct i40e_asq_cmd_details *cmd_details);
 i40e_status i40e_aq_get_cee_dcb_config(struct i40e_hw *hw,
 				       void *buff, u16 buff_size,

drivers/net/ethernet/intel/i40e/i40e_type.h

@@ -616,6 +616,7 @@ struct i40e_hw {
 #define I40E_HW_FLAG_AQ_PHY_ACCESS_CAPABLE  BIT_ULL(2)
 #define I40E_HW_FLAG_NVM_READ_REQUIRES_LOCK BIT_ULL(3)
 #define I40E_HW_FLAG_FW_LLDP_STOPPABLE      BIT_ULL(4)
+#define I40E_HW_FLAG_FW_LLDP_PERSISTENT     BIT_ULL(5)
 	u64 flags;
 
 	/* Used in set switch config AQ command */