drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 // Copyright (c) 2016-2017 Hisilicon Limited.

 #include "hclge_mbx.h"
 #include "hclgevf_main.h"
 #include "hnae3.h"

 #define CREATE_TRACE_POINTS
 #include "hclgevf_trace.h"

 static int hclgevf_resp_to_errno(u16 resp_code)
 {
 	return resp_code ? -resp_code : 0;
 }

 #define HCLGEVF_MBX_MATCH_ID_START	1
 static void hclgevf_reset_mbx_resp_status(struct hclgevf_dev *hdev)
 {
 	/* this function should be called with mbx_resp.mbx_mutex held
 	 * to protect the received_response from race condition
 	 */
 	hdev->mbx_resp.received_resp  = false;
 	hdev->mbx_resp.origin_mbx_msg = 0;
 	hdev->mbx_resp.resp_status    = 0;
 	hdev->mbx_resp.match_id++;
 	/* Update match_id and ensure the value of match_id is not zero */
 	if (hdev->mbx_resp.match_id == 0)
 		hdev->mbx_resp.match_id = HCLGEVF_MBX_MATCH_ID_START;
 	memset(hdev->mbx_resp.additional_info, 0, HCLGE_MBX_MAX_RESP_DATA_SIZE);
 }

 /* hclgevf_get_mbx_resp: used to get a response from PF after VF sends a mailbox
  * message to PF.
  * @hdev: pointer to struct hclgevf_dev
  * @code0: the message opcode VF send to PF.
  * @code1: the message sub-opcode VF send to PF.
  * @resp_data: pointer to store response data from PF to VF.
  * @resp_len: the length of resp_data from PF to VF.
  */
 static int hclgevf_get_mbx_resp(struct hclgevf_dev *hdev, u16 code0, u16 code1,
 				u8 *resp_data, u16 resp_len)
 {
 #define HCLGEVF_MAX_TRY_TIMES	500
 #define HCLGEVF_SLEEP_USECOND	1000
 	struct hclgevf_mbx_resp_status *mbx_resp;
 	u16 r_code0, r_code1;
 	int i = 0;

 	if (resp_len > HCLGE_MBX_MAX_RESP_DATA_SIZE) {
 		dev_err(&hdev->pdev->dev,
 			"VF mbx response len(=%u) exceeds maximum(=%u)\n",
 			resp_len,
 			HCLGE_MBX_MAX_RESP_DATA_SIZE);
 		return -EINVAL;
 	}

 	while ((!hdev->mbx_resp.received_resp) && (i < HCLGEVF_MAX_TRY_TIMES)) {
 		if (test_bit(HCLGE_COMM_STATE_CMD_DISABLE,
 			     &hdev->hw.hw.comm_state))
 			return -EIO;

 		usleep_range(HCLGEVF_SLEEP_USECOND, HCLGEVF_SLEEP_USECOND * 2);
 		i++;
 	}

 	if (i >= HCLGEVF_MAX_TRY_TIMES) {
 		dev_err(&hdev->pdev->dev,
 			"VF could not get mbx(%u,%u) resp(=%d) from PF in %d tries\n",
 			code0, code1, hdev->mbx_resp.received_resp, i);
 		return -EIO;
 	}

 	mbx_resp = &hdev->mbx_resp;
 	r_code0 = (u16)(mbx_resp->origin_mbx_msg >> 16);
 	r_code1 = (u16)(mbx_resp->origin_mbx_msg & 0xff);

 	if (mbx_resp->resp_status)
 		return mbx_resp->resp_status;

 	if (resp_data)
 		memcpy(resp_data, &mbx_resp->additional_info[0], resp_len);

 	hclgevf_reset_mbx_resp_status(hdev);

 	if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) {
 		dev_err(&hdev->pdev->dev,
 			"VF could not match resp code(code0=%u,code1=%u), %d\n",
 			code0, code1, mbx_resp->resp_status);
 		dev_err(&hdev->pdev->dev,
 			"VF could not match resp r_code(r_code0=%u,r_code1=%u)\n",
 			r_code0, r_code1);
 		return -EIO;
 	}

 	return 0;
 }

 int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev,
 			 struct hclge_vf_to_pf_msg *send_msg, bool need_resp,
 			 u8 *resp_data, u16 resp_len)
 {
 	struct hclge_mbx_vf_to_pf_cmd *req;
 	struct hclge_desc desc;
 	int status;

 	req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data;

 	if (!send_msg) {
 		dev_err(&hdev->pdev->dev,
 			"failed to send mbx, msg is NULL\n");
 		return -EINVAL;
 	}

 	hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
 	if (need_resp)
 		hnae3_set_bit(req->mbx_need_resp, HCLGE_MBX_NEED_RESP_B, 1);

 	memcpy(&req->msg, send_msg, sizeof(struct hclge_vf_to_pf_msg));

 	if (test_bit(HCLGEVF_STATE_NIC_REGISTERED, &hdev->state))
 		trace_hclge_vf_mbx_send(hdev, req);

 	/* synchronous send */
 	if (need_resp) {
 		mutex_lock(&hdev->mbx_resp.mbx_mutex);
 		hclgevf_reset_mbx_resp_status(hdev);
 		req->match_id = cpu_to_le16(hdev->mbx_resp.match_id);
 		status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 		if (status) {
 			dev_err(&hdev->pdev->dev,
 				"VF failed(=%d) to send mbx message to PF\n",
 				status);
 			mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 			return status;
 		}

 		status = hclgevf_get_mbx_resp(hdev, send_msg->code,
 					      send_msg->subcode, resp_data,
 					      resp_len);
 		mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 	} else {
 		/* asynchronous send */
 		status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 		if (status) {
 			dev_err(&hdev->pdev->dev,
 				"VF failed(=%d) to send mbx message to PF\n",
 				status);
 			return status;
 		}
 	}

 	return status;
 }

 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw)
 {
 	u32 tail = hclgevf_read_dev(hw, HCLGE_COMM_NIC_CRQ_TAIL_REG);

 	return tail == hw->hw.cmq.crq.next_to_use;
 }

 static void hclgevf_handle_mbx_response(struct hclgevf_dev *hdev,
 					struct hclge_mbx_pf_to_vf_cmd *req)
 {
 	u16 vf_mbx_msg_subcode = le16_to_cpu(req->msg.vf_mbx_msg_subcode);
 	u16 vf_mbx_msg_code = le16_to_cpu(req->msg.vf_mbx_msg_code);
 	struct hclgevf_mbx_resp_status *resp = &hdev->mbx_resp;
 	u16 resp_status = le16_to_cpu(req->msg.resp_status);
 	u16 match_id = le16_to_cpu(req->match_id);

 	if (resp->received_resp)
 		dev_warn(&hdev->pdev->dev,
 			"VF mbx resp flag not clear(%u)\n",
 			 vf_mbx_msg_code);

 	resp->origin_mbx_msg = (vf_mbx_msg_code << 16);
 	resp->origin_mbx_msg |= vf_mbx_msg_subcode;
 	resp->resp_status = hclgevf_resp_to_errno(resp_status);
 	memcpy(resp->additional_info, req->msg.resp_data,
 	       HCLGE_MBX_MAX_RESP_DATA_SIZE * sizeof(u8));
 	if (match_id) {
 		/* If match_id is not zero, it means PF support match_id.
 		 * if the match_id is right, VF get the right response, or
 		 * ignore the response. and driver will clear hdev->mbx_resp
 		 * when send next message which need response.
 		 */
 		if (match_id == resp->match_id)
 			resp->received_resp = true;
 	} else {
 		resp->received_resp = true;
 	}
 }

 static void hclgevf_handle_mbx_msg(struct hclgevf_dev *hdev,
 				   struct hclge_mbx_pf_to_vf_cmd *req)
 {
 	/* we will drop the async msg if we find ARQ as full
 	 * and continue with next message
 	 */
 	if (atomic_read(&hdev->arq.count) >=
 	    HCLGE_MBX_MAX_ARQ_MSG_NUM) {
 		dev_warn(&hdev->pdev->dev,
 			 "Async Q full, dropping msg(%u)\n",
 			 le16_to_cpu(req->msg.code));
 		return;
 	}

 	/* tail the async message in arq */
 	memcpy(hdev->arq.msg_q[hdev->arq.tail], &req->msg,
 	       HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16));
 	hclge_mbx_tail_ptr_move_arq(hdev->arq);
 	atomic_inc(&hdev->arq.count);

 	hclgevf_mbx_task_schedule(hdev);
 }

 void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
 {
 	struct hclge_mbx_pf_to_vf_cmd *req;
 	struct hclge_comm_cmq_ring *crq;
 	struct hclge_desc *desc;
 	u16 flag;
 	u16 code;

 	crq = &hdev->hw.hw.cmq.crq;

 	while (!hclgevf_cmd_crq_empty(&hdev->hw)) {
 		if (test_bit(HCLGE_COMM_STATE_CMD_DISABLE,
 			     &hdev->hw.hw.comm_state)) {
 			dev_info(&hdev->pdev->dev, "vf crq need init\n");
 			return;
 		}

 		desc = &crq->desc[crq->next_to_use];
 		req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;

 		flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
 		code = le16_to_cpu(req->msg.code);
 		if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) {
 			dev_warn(&hdev->pdev->dev,
 				 "dropped invalid mailbox message, code = %u\n",
 				 code);

 			/* dropping/not processing this invalid message */
 			crq->desc[crq->next_to_use].flag = 0;
 			hclge_mbx_ring_ptr_move_crq(crq);
 			continue;
 		}

 		trace_hclge_vf_mbx_get(hdev, req);

 		/* synchronous messages are time critical and need preferential
 		 * treatment. Therefore, we need to acknowledge all the sync
 		 * responses as quickly as possible so that waiting tasks do not
 		 * timeout and simultaneously queue the async messages for later
 		 * prcessing in context of mailbox task i.e. the slow path.
 		 */
 		switch (code) {
 		case HCLGE_MBX_PF_VF_RESP:
 			hclgevf_handle_mbx_response(hdev, req);
 			break;
 		case HCLGE_MBX_LINK_STAT_CHANGE:
 		case HCLGE_MBX_ASSERTING_RESET:
 		case HCLGE_MBX_LINK_STAT_MODE:
 		case HCLGE_MBX_PUSH_VLAN_INFO:
 		case HCLGE_MBX_PUSH_PROMISC_INFO:
 			hclgevf_handle_mbx_msg(hdev, req);
 			break;
 		default:
 			dev_err(&hdev->pdev->dev,
 				"VF received unsupported(%u) mbx msg from PF\n",
 				code);
 			break;
 		}
 		crq->desc[crq->next_to_use].flag = 0;
 		hclge_mbx_ring_ptr_move_crq(crq);
 	}

 	/* Write back CMDQ_RQ header pointer, M7 need this pointer */
 	hclgevf_write_dev(&hdev->hw, HCLGE_COMM_NIC_CRQ_HEAD_REG,
 			  crq->next_to_use);
 }

 static void hclgevf_parse_promisc_info(struct hclgevf_dev *hdev,
 				       u16 promisc_info)
 {
 	if (!promisc_info)
 		dev_info(&hdev->pdev->dev,
 			 "Promisc mode is closed by host for being untrusted.\n");
 }

 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
 {
 	struct hclge_mbx_port_base_vlan *vlan_info;
 	struct hclge_mbx_link_status *link_info;
 	struct hclge_mbx_link_mode *link_mode;
 	enum hnae3_reset_type reset_type;
 	u16 link_status, state;
 	__le16 *msg_q;
 	u16 opcode;
 	u8 duplex;
 	u32 speed;
 	u32 tail;
 	u8 flag;
 	u16 idx;

 	tail = hdev->arq.tail;

 	/* process all the async queue messages */
 	while (tail != hdev->arq.head) {
 		if (test_bit(HCLGE_COMM_STATE_CMD_DISABLE,
 			     &hdev->hw.hw.comm_state)) {
 			dev_info(&hdev->pdev->dev,
 				 "vf crq need init in async\n");
 			return;
 		}

 		msg_q = hdev->arq.msg_q[hdev->arq.head];
 		opcode = le16_to_cpu(msg_q[0]);
 		switch (opcode) {
 		case HCLGE_MBX_LINK_STAT_CHANGE:
 			link_info = (struct hclge_mbx_link_status *)(msg_q + 1);
 			link_status = le16_to_cpu(link_info->link_status);
 			speed = le32_to_cpu(link_info->speed);
 			duplex = (u8)le16_to_cpu(link_info->duplex);
 			flag = link_info->flag;

 			/* update upper layer with new link link status */
 			hclgevf_update_speed_duplex(hdev, speed, duplex);
 			hclgevf_update_link_status(hdev, link_status);

 			if (flag & HCLGE_MBX_PUSH_LINK_STATUS_EN)
 				set_bit(HCLGEVF_STATE_PF_PUSH_LINK_STATUS,
 					&hdev->state);

 			break;
 		case HCLGE_MBX_LINK_STAT_MODE:
 			link_mode = (struct hclge_mbx_link_mode *)(msg_q + 1);
 			idx = le16_to_cpu(link_mode->idx);
 			if (idx)
 				hdev->hw.mac.supported =
 					le64_to_cpu(link_mode->link_mode);
 			else
 				hdev->hw.mac.advertising =
 					le64_to_cpu(link_mode->link_mode);
 			break;
 		case HCLGE_MBX_ASSERTING_RESET:
 			/* PF has asserted reset hence VF should go in pending
 			 * state and poll for the hardware reset status till it
 			 * has been completely reset. After this stack should
 			 * eventually be re-initialized.
 			 */
 			reset_type =
 				(enum hnae3_reset_type)le16_to_cpu(msg_q[1]);
 			set_bit(reset_type, &hdev->reset_pending);
 			set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state);
 			hclgevf_reset_task_schedule(hdev);

 			break;
 		case HCLGE_MBX_PUSH_VLAN_INFO:
 			vlan_info =
 				(struct hclge_mbx_port_base_vlan *)(msg_q + 1);
 			state = le16_to_cpu(vlan_info->state);
 			hclgevf_update_port_base_vlan_info(hdev, state,
 							   vlan_info);
 			break;
 		case HCLGE_MBX_PUSH_PROMISC_INFO:
 			hclgevf_parse_promisc_info(hdev, le16_to_cpu(msg_q[1]));
 			break;
 		default:
 			dev_err(&hdev->pdev->dev,
 				"fetched unsupported(%u) message from arq\n",
 				opcode);
 			break;
 		}

 		hclge_mbx_head_ptr_move_arq(hdev->arq);
 		atomic_dec(&hdev->arq.count);
 		msg_q = hdev->arq.msg_q[hdev->arq.head];
 	}
 }
	// SPDX-License-Identifier: GPL-2.0+
	// Copyright (c) 2016-2017 Hisilicon Limited.

	#include "hclge_mbx.h"
	#include "hclgevf_main.h"
	#include "hnae3.h"

	#define CREATE_TRACE_POINTS
	#include "hclgevf_trace.h"

	static int hclgevf_resp_to_errno(u16 resp_code)
	{
	return resp_code ? -resp_code : 0;
	}

	#define HCLGEVF_MBX_MATCH_ID_START 1
	static void hclgevf_reset_mbx_resp_status(struct hclgevf_dev *hdev)
	{
	/* this function should be called with mbx_resp.mbx_mutex held
	* to protect the received_response from race condition
	*/
	hdev->mbx_resp.received_resp = false;
	hdev->mbx_resp.origin_mbx_msg = 0;
	hdev->mbx_resp.resp_status = 0;
	hdev->mbx_resp.match_id++;
	/* Update match_id and ensure the value of match_id is not zero */
	if (hdev->mbx_resp.match_id == 0)
	hdev->mbx_resp.match_id = HCLGEVF_MBX_MATCH_ID_START;
	memset(hdev->mbx_resp.additional_info, 0, HCLGE_MBX_MAX_RESP_DATA_SIZE);
	}

	/* hclgevf_get_mbx_resp: used to get a response from PF after VF sends a mailbox
	* message to PF.
	* @hdev: pointer to struct hclgevf_dev
	* @code0: the message opcode VF send to PF.
	* @code1: the message sub-opcode VF send to PF.
	* @resp_data: pointer to store response data from PF to VF.
	* @resp_len: the length of resp_data from PF to VF.
	*/
	static int hclgevf_get_mbx_resp(struct hclgevf_dev *hdev, u16 code0, u16 code1,
	u8 *resp_data, u16 resp_len)
	{
	#define HCLGEVF_MAX_TRY_TIMES 500
	#define HCLGEVF_SLEEP_USECOND 1000
	struct hclgevf_mbx_resp_status *mbx_resp;
	u16 r_code0, r_code1;
	int i = 0;

	if (resp_len > HCLGE_MBX_MAX_RESP_DATA_SIZE) {
	dev_err(&hdev->pdev->dev,
	"VF mbx response len(=%u) exceeds maximum(=%u)\n",
	resp_len,
	HCLGE_MBX_MAX_RESP_DATA_SIZE);
	return -EINVAL;
	}

	while ((!hdev->mbx_resp.received_resp) && (i < HCLGEVF_MAX_TRY_TIMES)) {
	if (test_bit(HCLGE_COMM_STATE_CMD_DISABLE,
	&hdev->hw.hw.comm_state))
	return -EIO;

	usleep_range(HCLGEVF_SLEEP_USECOND, HCLGEVF_SLEEP_USECOND * 2);
	i++;
	}

	if (i >= HCLGEVF_MAX_TRY_TIMES) {
	dev_err(&hdev->pdev->dev,
	"VF could not get mbx(%u,%u) resp(=%d) from PF in %d tries\n",
	code0, code1, hdev->mbx_resp.received_resp, i);
	return -EIO;
	}

	mbx_resp = &hdev->mbx_resp;
	r_code0 = (u16)(mbx_resp->origin_mbx_msg >> 16);
	r_code1 = (u16)(mbx_resp->origin_mbx_msg & 0xff);

	if (mbx_resp->resp_status)
	return mbx_resp->resp_status;

	if (resp_data)
	memcpy(resp_data, &mbx_resp->additional_info[0], resp_len);

	hclgevf_reset_mbx_resp_status(hdev);

	if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) {
	dev_err(&hdev->pdev->dev,
	"VF could not match resp code(code0=%u,code1=%u), %d\n",
	code0, code1, mbx_resp->resp_status);
	dev_err(&hdev->pdev->dev,
	"VF could not match resp r_code(r_code0=%u,r_code1=%u)\n",
	r_code0, r_code1);
	return -EIO;
	}

	return 0;
	}

	int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev,
	struct hclge_vf_to_pf_msg *send_msg, bool need_resp,
	u8 *resp_data, u16 resp_len)
	{
	struct hclge_mbx_vf_to_pf_cmd *req;
	struct hclge_desc desc;
	int status;

	req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data;

	if (!send_msg) {
	dev_err(&hdev->pdev->dev,
	"failed to send mbx, msg is NULL\n");
	return -EINVAL;
	}

	hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
	if (need_resp)
	hnae3_set_bit(req->mbx_need_resp, HCLGE_MBX_NEED_RESP_B, 1);

	memcpy(&req->msg, send_msg, sizeof(struct hclge_vf_to_pf_msg));

	if (test_bit(HCLGEVF_STATE_NIC_REGISTERED, &hdev->state))
	trace_hclge_vf_mbx_send(hdev, req);

	/* synchronous send */
	if (need_resp) {
	mutex_lock(&hdev->mbx_resp.mbx_mutex);
	hclgevf_reset_mbx_resp_status(hdev);
	req->match_id = cpu_to_le16(hdev->mbx_resp.match_id);
	status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
	if (status) {
	dev_err(&hdev->pdev->dev,
	"VF failed(=%d) to send mbx message to PF\n",
	status);
	mutex_unlock(&hdev->mbx_resp.mbx_mutex);
	return status;
	}

	status = hclgevf_get_mbx_resp(hdev, send_msg->code,
	send_msg->subcode, resp_data,
	resp_len);
	mutex_unlock(&hdev->mbx_resp.mbx_mutex);
	} else {
	/* asynchronous send */
	status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
	if (status) {
	dev_err(&hdev->pdev->dev,
	"VF failed(=%d) to send mbx message to PF\n",
	status);
	return status;
	}
	}

	return status;
	}

	static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw)
	{
	u32 tail = hclgevf_read_dev(hw, HCLGE_COMM_NIC_CRQ_TAIL_REG);

	return tail == hw->hw.cmq.crq.next_to_use;
	}

	static void hclgevf_handle_mbx_response(struct hclgevf_dev *hdev,
	struct hclge_mbx_pf_to_vf_cmd *req)
	{
	u16 vf_mbx_msg_subcode = le16_to_cpu(req->msg.vf_mbx_msg_subcode);
	u16 vf_mbx_msg_code = le16_to_cpu(req->msg.vf_mbx_msg_code);
	struct hclgevf_mbx_resp_status *resp = &hdev->mbx_resp;
	u16 resp_status = le16_to_cpu(req->msg.resp_status);
	u16 match_id = le16_to_cpu(req->match_id);

	if (resp->received_resp)
	dev_warn(&hdev->pdev->dev,
	"VF mbx resp flag not clear(%u)\n",
	vf_mbx_msg_code);

	resp->origin_mbx_msg = (vf_mbx_msg_code << 16);
	resp->origin_mbx_msg \|= vf_mbx_msg_subcode;
	resp->resp_status = hclgevf_resp_to_errno(resp_status);
	memcpy(resp->additional_info, req->msg.resp_data,
	HCLGE_MBX_MAX_RESP_DATA_SIZE * sizeof(u8));
	if (match_id) {
	/* If match_id is not zero, it means PF support match_id.
	* if the match_id is right, VF get the right response, or
	* ignore the response. and driver will clear hdev->mbx_resp
	* when send next message which need response.
	*/
	if (match_id == resp->match_id)
	resp->received_resp = true;
	} else {
	resp->received_resp = true;
	}
	}

	static void hclgevf_handle_mbx_msg(struct hclgevf_dev *hdev,
	struct hclge_mbx_pf_to_vf_cmd *req)
	{
	/* we will drop the async msg if we find ARQ as full
	* and continue with next message
	*/
	if (atomic_read(&hdev->arq.count) >=
	HCLGE_MBX_MAX_ARQ_MSG_NUM) {
	dev_warn(&hdev->pdev->dev,
	"Async Q full, dropping msg(%u)\n",
	le16_to_cpu(req->msg.code));
	return;
	}

	/* tail the async message in arq */
	memcpy(hdev->arq.msg_q[hdev->arq.tail], &req->msg,
	HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16));
	hclge_mbx_tail_ptr_move_arq(hdev->arq);
	atomic_inc(&hdev->arq.count);

	hclgevf_mbx_task_schedule(hdev);
	}

	void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
	{
	struct hclge_mbx_pf_to_vf_cmd *req;
	struct hclge_comm_cmq_ring *crq;
	struct hclge_desc *desc;
	u16 flag;
	u16 code;

	crq = &hdev->hw.hw.cmq.crq;

	while (!hclgevf_cmd_crq_empty(&hdev->hw)) {
	if (test_bit(HCLGE_COMM_STATE_CMD_DISABLE,
	&hdev->hw.hw.comm_state)) {
	dev_info(&hdev->pdev->dev, "vf crq need init\n");
	return;
	}

	desc = &crq->desc[crq->next_to_use];
	req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;

	flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
	code = le16_to_cpu(req->msg.code);
	if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) {
	dev_warn(&hdev->pdev->dev,
	"dropped invalid mailbox message, code = %u\n",
	code);

	/* dropping/not processing this invalid message */
	crq->desc[crq->next_to_use].flag = 0;
	hclge_mbx_ring_ptr_move_crq(crq);
	continue;
	}

	trace_hclge_vf_mbx_get(hdev, req);

	/* synchronous messages are time critical and need preferential
	* treatment. Therefore, we need to acknowledge all the sync
	* responses as quickly as possible so that waiting tasks do not
	* timeout and simultaneously queue the async messages for later
	* prcessing in context of mailbox task i.e. the slow path.
	*/
	switch (code) {
	case HCLGE_MBX_PF_VF_RESP:
	hclgevf_handle_mbx_response(hdev, req);
	break;
	case HCLGE_MBX_LINK_STAT_CHANGE:
	case HCLGE_MBX_ASSERTING_RESET:
	case HCLGE_MBX_LINK_STAT_MODE:
	case HCLGE_MBX_PUSH_VLAN_INFO:
	case HCLGE_MBX_PUSH_PROMISC_INFO:
	hclgevf_handle_mbx_msg(hdev, req);
	break;
	default:
	dev_err(&hdev->pdev->dev,
	"VF received unsupported(%u) mbx msg from PF\n",
	code);
	break;
	}
	crq->desc[crq->next_to_use].flag = 0;
	hclge_mbx_ring_ptr_move_crq(crq);
	}

	/* Write back CMDQ_RQ header pointer, M7 need this pointer */
	hclgevf_write_dev(&hdev->hw, HCLGE_COMM_NIC_CRQ_HEAD_REG,
	crq->next_to_use);
	}

	static void hclgevf_parse_promisc_info(struct hclgevf_dev *hdev,
	u16 promisc_info)
	{
	if (!promisc_info)
	dev_info(&hdev->pdev->dev,
	"Promisc mode is closed by host for being untrusted.\n");
	}

	void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
	{
	struct hclge_mbx_port_base_vlan *vlan_info;
	struct hclge_mbx_link_status *link_info;
	struct hclge_mbx_link_mode *link_mode;
	enum hnae3_reset_type reset_type;
	u16 link_status, state;
	__le16 *msg_q;
	u16 opcode;
	u8 duplex;
	u32 speed;
	u32 tail;
	u8 flag;
	u16 idx;

	tail = hdev->arq.tail;

	/* process all the async queue messages */
	while (tail != hdev->arq.head) {
	if (test_bit(HCLGE_COMM_STATE_CMD_DISABLE,
	&hdev->hw.hw.comm_state)) {
	dev_info(&hdev->pdev->dev,
	"vf crq need init in async\n");
	return;
	}

	msg_q = hdev->arq.msg_q[hdev->arq.head];
	opcode = le16_to_cpu(msg_q[0]);
	switch (opcode) {
	case HCLGE_MBX_LINK_STAT_CHANGE:
	link_info = (struct hclge_mbx_link_status *)(msg_q + 1);
	link_status = le16_to_cpu(link_info->link_status);
	speed = le32_to_cpu(link_info->speed);
	duplex = (u8)le16_to_cpu(link_info->duplex);
	flag = link_info->flag;

	/* update upper layer with new link link status */
	hclgevf_update_speed_duplex(hdev, speed, duplex);
	hclgevf_update_link_status(hdev, link_status);

	if (flag & HCLGE_MBX_PUSH_LINK_STATUS_EN)
	set_bit(HCLGEVF_STATE_PF_PUSH_LINK_STATUS,
	&hdev->state);

	break;
	case HCLGE_MBX_LINK_STAT_MODE:
	link_mode = (struct hclge_mbx_link_mode *)(msg_q + 1);
	idx = le16_to_cpu(link_mode->idx);
	if (idx)
	hdev->hw.mac.supported =
	le64_to_cpu(link_mode->link_mode);
	else
	hdev->hw.mac.advertising =
	le64_to_cpu(link_mode->link_mode);
	break;
	case HCLGE_MBX_ASSERTING_RESET:
	/* PF has asserted reset hence VF should go in pending
	* state and poll for the hardware reset status till it
	* has been completely reset. After this stack should
	* eventually be re-initialized.
	*/
	reset_type =
	(enum hnae3_reset_type)le16_to_cpu(msg_q[1]);
	set_bit(reset_type, &hdev->reset_pending);
	set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state);
	hclgevf_reset_task_schedule(hdev);

	break;
	case HCLGE_MBX_PUSH_VLAN_INFO:
	vlan_info =
	(struct hclge_mbx_port_base_vlan *)(msg_q + 1);
	state = le16_to_cpu(vlan_info->state);
	hclgevf_update_port_base_vlan_info(hdev, state,
	vlan_info);
	break;
	case HCLGE_MBX_PUSH_PROMISC_INFO:
	hclgevf_parse_promisc_info(hdev, le16_to_cpu(msg_q[1]));
	break;
	default:
	dev_err(&hdev->pdev->dev,
	"fetched unsupported(%u) message from arq\n",
	opcode);
	break;
	}

	hclge_mbx_head_ptr_move_arq(hdev->arq);
	atomic_dec(&hdev->arq.count);
	msg_q = hdev->arq.msg_q[hdev->arq.head];
	}
	}