1 files changed, 388 insertions, 0 deletions

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c
new file mode 100644
index 000000000..85c2a634c
--- /dev/null
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c
@@ -0,0 +1,388 @@
+// 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++;
+	}
+
+	/* ensure additional_info will be seen after received_resp */
+	smp_rmb();
+
+	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));
+
+	/* ensure additional_info will be seen before setting received_resp */
+	smp_wmb();
+
+	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];
+	}
+}