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From:   Guangbin Huang <huangguangbin2@huawei.com>
To:     <davem@davemloft.net>, <kuba@kernel.org>, <jiri@nvidia.com>
CC:     <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <lipeng321@huawei.com>, <chenhao288@hisilicon.com>,
        <huangguangbin2@huawei.com>
Subject: [RFC PATCH net-next 5/8] net: hns3: add devlink reload support for PF
Date:   Tue, 6 Jul 2021 14:41:29 +0800
Message-ID: <1625553692-2773-6-git-send-email-huangguangbin2@huawei.com>
In-Reply-To: <1625553692-2773-1-git-send-email-huangguangbin2@huawei.com>
References: <1625553692-2773-1-git-send-email-huangguangbin2@huawei.com>
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From: Hao Chen <chenhao288@hisilicon.com>

Add devlink reload support for HNS3 ethernet PF driver.

Signed-off-by: Hao Chen <chenhao288@hisilicon.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
---
 .../ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c | 70 ++++++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
index 1646e9e234fe..276a4261bb9b 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
@@ -32,8 +32,74 @@ static int hclge_devlink_info_get(struct devlink *devlink,
 	return devlink_info_version_running_put(req, "fw-version", version_str);
 }
 
+static int hclge_devlink_reload_down(struct devlink *devlink, bool netns_change,
+				     enum devlink_reload_action action,
+				     enum devlink_reload_limit limit,
+				     struct netlink_ext_ack *extack)
+{
+	struct hclge_devlink_priv *priv = devlink_priv(devlink);
+	struct hclge_dev *hdev = priv->hdev;
+	struct hnae3_handle *h = &hdev->vport->nic;
+	struct pci_dev *pdev = hdev->pdev;
+	int ret;
+
+	if (test_bit(HCLGE_STATE_RST_HANDLING, &hdev->state)) {
+		dev_err(&pdev->dev, "reset is handling\n");
+		return -EBUSY;
+	}
+
+	switch (action) {
+	case DEVLINK_RELOAD_ACTION_DRIVER_REINIT:
+		rtnl_lock();
+		ret = hdev->nic_client->ops->reset_notify(h, HNAE3_DOWN_CLIENT);
+		if (ret) {
+			rtnl_unlock();
+			return ret;
+		}
+
+		ret = hdev->nic_client->ops->reset_notify(h,
+							  HNAE3_UNINIT_CLIENT);
+		rtnl_unlock();
+		return ret;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int hclge_devlink_reload_up(struct devlink *devlink,
+				   enum devlink_reload_action action,
+				   enum devlink_reload_limit limit,
+				   u32 *actions_performed,
+				   struct netlink_ext_ack *extack)
+{
+	struct hclge_devlink_priv *priv = devlink_priv(devlink);
+	struct hclge_dev *hdev = priv->hdev;
+	struct hnae3_handle *h = &hdev->vport->nic;
+	int ret;
+
+	*actions_performed = BIT(action);
+	switch (action) {
+	case DEVLINK_RELOAD_ACTION_DRIVER_REINIT:
+		rtnl_lock();
+		ret = hdev->nic_client->ops->reset_notify(h, HNAE3_INIT_CLIENT);
+		if (ret) {
+			rtnl_unlock();
+			return ret;
+		}
+
+		ret = hdev->nic_client->ops->reset_notify(h, HNAE3_UP_CLIENT);
+		rtnl_unlock();
+		return ret;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
 static const struct devlink_ops hclge_devlink_ops = {
 	.info_get = hclge_devlink_info_get,
+	.reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT),
+	.reload_down = hclge_devlink_reload_down,
+	.reload_up = hclge_devlink_reload_up,
 };
 
 int hclge_devlink_init(struct hclge_dev *hdev)
@@ -60,6 +126,8 @@ int hclge_devlink_init(struct hclge_dev *hdev)
 
 	hdev->devlink = devlink;
 
+	devlink_reload_enable(devlink);
+
 	return 0;
 
 out_reg_fail:
@@ -74,6 +142,8 @@ void hclge_devlink_uninit(struct hclge_dev *hdev)
 	if (!devlink)
 		return;
 
+	devlink_reload_disable(devlink);
+
 	devlink_unregister(devlink);
 
 	devlink_free(devlink);
-- 
2.8.1