net: hns3: add support for registering devlink for PF

Add devlink register support for HNS3 ethernet PF 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/Kconfig

@@ -90,6 +90,7 @@ config HNS_ENET
 config HNS3
 	tristate "Hisilicon Network Subsystem Support HNS3 (Framework)"
 	depends on PCI
+	select NET_DEVLINK
 	help
 	  This selects the framework support for Hisilicon Network Subsystem 3.
 	  This layer facilitates clients like ENET, RoCE and user-space ethernet

drivers/net/ethernet/hisilicon/hns3/hns3pf/Makefile

@@ -7,6 +7,6 @@ ccflags-y := -I $(srctree)/drivers/net/ethernet/hisilicon/hns3
 ccflags-y += -I $(srctree)/$(src)
 
 obj-$(CONFIG_HNS3_HCLGE) += hclge.o
-hclge-objs = hclge_main.o hclge_cmd.o hclge_mdio.o hclge_tm.o hclge_mbx.o hclge_err.o  hclge_debugfs.o hclge_ptp.o
+hclge-objs = hclge_main.o hclge_cmd.o hclge_mdio.o hclge_tm.o hclge_mbx.o hclge_err.o  hclge_debugfs.o hclge_ptp.o hclge_devlink.o
 
 hclge-$(CONFIG_HNS3_DCB) += hclge_dcb.o

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c

@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (c) 2021 Hisilicon Limited. */
+
+#include <net/devlink.h>
+
+#include "hclge_devlink.h"
+
+static const struct devlink_ops hclge_devlink_ops = {
+};
+
+int hclge_devlink_init(struct hclge_dev *hdev)
+{
+	struct pci_dev *pdev = hdev->pdev;
+	struct hclge_devlink_priv *priv;
+	struct devlink *devlink;
+	int ret;
+
+	devlink = devlink_alloc(&hclge_devlink_ops,
+				sizeof(struct hclge_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 hclge_devlink_uninit(struct hclge_dev *hdev)
+{
+	struct devlink *devlink = hdev->devlink;
+
+	if (!devlink)
+		return;
+
+	devlink_unregister(devlink);
+
+	devlink_free(devlink);
+
+	hdev->devlink = NULL;
+}

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.h

@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/* Copyright (c) 2021 Hisilicon Limited. */
+
+#ifndef __HCLGE_DEVLINK_H
+#define __HCLGE_DEVLINK_H
+
+#include "hclge_main.h"
+
+struct hclge_devlink_priv {
+	struct hclge_dev *hdev;
+};
+
+int hclge_devlink_init(struct hclge_dev *hdev);
+void hclge_devlink_uninit(struct hclge_dev *hdev);
+#endif

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c

@@ -23,6 +23,7 @@
 #include "hclge_tm.h"
 #include "hclge_err.h"
 #include "hnae3.h"
+#include "hclge_devlink.h"
 
 #define HCLGE_NAME			"hclge"
 #define HCLGE_STATS_READ(p, offset) (*(u64 *)((u8 *)(p) + (offset)))
@@ -11482,10 +11483,14 @@ static int hclge_init_ae_dev(struct hnae3_ae_dev *ae_dev)
 	if (ret)
 		goto out;
 
+	ret = hclge_devlink_init(hdev);
+	if (ret)
+		goto err_pci_uninit;
+
 	/* Firmware command queue initialize */
 	ret = hclge_cmd_queue_init(hdev);
 	if (ret)
-		goto err_pci_uninit;
+		goto err_devlink_uninit;
 
 	/* Firmware command initialize */
 	ret = hclge_cmd_init(hdev);
@@ -11658,6 +11663,8 @@ err_msi_uninit:
 	pci_free_irq_vectors(pdev);
 err_cmd_uninit:
 	hclge_cmd_uninit(hdev);
+err_devlink_uninit:
+	hclge_devlink_uninit(hdev);
 err_pci_uninit:
 	pcim_iounmap(pdev, hdev->hw.io_base);
 	pci_clear_master(pdev);
@@ -12048,6 +12055,7 @@ static void hclge_uninit_ae_dev(struct hnae3_ae_dev *ae_dev)
 
 	hclge_cmd_uninit(hdev);
 	hclge_misc_irq_uninit(hdev);
+	hclge_devlink_uninit(hdev);
 	hclge_pci_uninit(hdev);
 	mutex_destroy(&hdev->vport_lock);
 	hclge_uninit_vport_vlan_table(hdev);

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h

@@ -8,6 +8,7 @@
 #include <linux/phy.h>
 #include <linux/if_vlan.h>
 #include <linux/kfifo.h>
+#include <net/devlink.h>
 
 #include "hclge_cmd.h"
 #include "hclge_ptp.h"
@@ -943,6 +944,7 @@ struct hclge_dev {
 	cpumask_t affinity_mask;
 	struct irq_affinity_notify affinity_notify;
 	struct hclge_ptp *ptp;
+	struct devlink *devlink;
 };
 
 /* VPort level vlan tag configuration for TX direction */