net: hns3: add support for registering devlink for VF

Add devlink register support for HNS3 ethernet VF driver.
Signed-off-by: Yufeng Mo <moyufeng@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3vf/Makefile

@@ -7,4 +7,4 @@ ccflags-y := -I $(srctree)/drivers/net/ethernet/hisilicon/hns3
 ccflags-y += -I $(srctree)/$(src)
 
 obj-$(CONFIG_HNS3_HCLGEVF) += hclgevf.o
-hclgevf-objs = hclgevf_main.o hclgevf_cmd.o hclgevf_mbx.o
+hclgevf-objs = hclgevf_main.o hclgevf_cmd.o hclgevf_mbx.o  hclgevf_devlink.o

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c

+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (c) 2021 Hisilicon Limited. */
+
+#include <net/devlink.h>
+
+#include "hclgevf_devlink.h"
+
+static const struct devlink_ops hclgevf_devlink_ops = {
+};
+
+int hclgevf_devlink_init(struct hclgevf_dev *hdev)
+{
+	struct pci_dev *pdev = hdev->pdev;
+	struct hclgevf_devlink_priv *priv;
+	struct devlink *devlink;
+	int ret;
+
+	devlink = devlink_alloc(&hclgevf_devlink_ops,
+				sizeof(struct hclgevf_devlink_priv));
+	if (!devlink)
+		return -ENOMEM;
+
+	priv = devlink_priv(devlink);
+	priv->hdev = hdev;
+
+	ret = devlink_register(devlink, &pdev->dev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register devlink, ret = %d\n",
+			ret);
+		goto out_reg_fail;
+	}
+
+	hdev->devlink = devlink;
+
+	return 0;
+
+out_reg_fail:
+	devlink_free(devlink);
+	return ret;
+}
+
+void hclgevf_devlink_uninit(struct hclgevf_dev *hdev)
+{
+	struct devlink *devlink = hdev->devlink;
+
+	if (!devlink)
+		return;
+
+	devlink_unregister(devlink);
+
+	devlink_free(devlink);
+
+	hdev->devlink = NULL;
+}

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.h

+/* SPDX-License-Identifier: GPL-2.0+ */
+/* Copyright (c) 2021 Hisilicon Limited. */
+
+#ifndef __HCLGEVF_DEVLINK_H
+#define __HCLGEVF_DEVLINK_H
+
+#include "hclgevf_main.h"
+
+struct hclgevf_devlink_priv {
+	struct hclgevf_dev *hdev;
+};
+
+int hclgevf_devlink_init(struct hclgevf_dev *hdev);
+void hclgevf_devlink_uninit(struct hclgevf_dev *hdev);
+#endif

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c

@@ -8,6 +8,7 @@
 #include "hclgevf_main.h"
 #include "hclge_mbx.h"
 #include "hnae3.h"
+#include "hclgevf_devlink.h"
 
 #define HCLGEVF_NAME	"hclgevf"
 
@@ -3337,6 +3338,10 @@ static int hclgevf_init_hdev(struct hclgevf_dev *hdev)
 	if (ret)
 		return ret;
 
+	ret = hclgevf_devlink_init(hdev);
+	if (ret)
+		goto err_devlink_init;
+
 	ret = hclgevf_cmd_queue_init(hdev);
 	if (ret)
 		goto err_cmd_queue_init;
@@ -3441,6 +3446,8 @@ static int hclgevf_init_hdev(struct hclgevf_dev *hdev)
 err_cmd_init:
 	hclgevf_cmd_uninit(hdev);
 err_cmd_queue_init:
+	hclgevf_devlink_uninit(hdev);
+err_devlink_init:
 	hclgevf_pci_uninit(hdev);
 	clear_bit(HCLGEVF_STATE_IRQ_INITED, &hdev->state);
 	return ret;
@@ -3462,6 +3469,7 @@ static void hclgevf_uninit_hdev(struct hclgevf_dev *hdev)
 	}
 
 	hclgevf_cmd_uninit(hdev);
+	hclgevf_devlink_uninit(hdev);
 	hclgevf_pci_uninit(hdev);
 	hclgevf_uninit_mac_list(hdev);
 }

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h

@@ -6,6 +6,7 @@
 #include <linux/fs.h>
 #include <linux/if_vlan.h>
 #include <linux/types.h>
+#include <net/devlink.h>
 #include "hclge_mbx.h"
 #include "hclgevf_cmd.h"
 #include "hnae3.h"
@@ -330,6 +331,8 @@ struct hclgevf_dev {
 	u32 flag;
 	unsigned long serv_processed_cnt;
 	unsigned long last_serv_processed;
+
+	struct devlink *devlink;
 };
 
 static inline bool hclgevf_is_reset_pending(struct hclgevf_dev *hdev)