Merge branch 'devlink-cleanup-for-delay-event'

Leon Romanovsky says:

====================
Devlink cleanup for delay event series

Jakub's request to make sure that devlink events are delayed and not
printed till they fully accessible [1] requires us to implement delayed
event notification system in the devlink.

In order to do it, I moved some of my patches (xarray e.t.c) from the future
series to be before "Move devlink_register to be near devlink_reload_enable" [2].

That allows us to rely on DEVLINK_REGISTERED xarray mark to decide if to print
event or not.

Other patches are simple cleanup which is needed anyway.

[1] https://lore.kernel.org/lkml/20210811071817.4af5ab34@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com
[2] https://lore.kernel.org/lkml/cover.1628599239.git.leonro@nvidia.com

Next in the queue:
 * Delay event series
 * Move devlink_register to be near devlink_reload_enable"
 * Extension of devlink_ops to be set dynamically
 * devlink_reload_* delete
 * Devlink locks rework to user xarray and reference counting
 * ????
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

Author: davem330

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

@@ -118,6 +118,7 @@ int hclge_devlink_init(struct hclge_dev *hdev)
 
 	priv = devlink_priv(devlink);
 	priv->hdev = hdev;
+	hdev->devlink = devlink;
 
 	ret = devlink_register(devlink);
 	if (ret) {
@@ -126,8 +127,6 @@ int hclge_devlink_init(struct hclge_dev *hdev)
 		goto out_reg_fail;
 	}
 
-	hdev->devlink = devlink;
-
 	devlink_reload_enable(devlink);
 
 	return 0;
@@ -141,14 +140,9 @@ void hclge_devlink_uninit(struct hclge_dev *hdev)
 {
 	struct devlink *devlink = hdev->devlink;
 
-	if (!devlink)
-		return;
-
 	devlink_reload_disable(devlink);
 
 	devlink_unregister(devlink);
 
 	devlink_free(devlink);
-
-	hdev->devlink = NULL;
 }

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

@@ -120,6 +120,7 @@ int hclgevf_devlink_init(struct hclgevf_dev *hdev)
 
 	priv = devlink_priv(devlink);
 	priv->hdev = hdev;
+	hdev->devlink = devlink;
 
 	ret = devlink_register(devlink);
 	if (ret) {
@@ -128,8 +129,6 @@ int hclgevf_devlink_init(struct hclgevf_dev *hdev)
 		goto out_reg_fail;
 	}
 
-	hdev->devlink = devlink;
-
 	devlink_reload_enable(devlink);
 
 	return 0;
@@ -143,14 +142,9 @@ void hclgevf_devlink_uninit(struct hclgevf_dev *hdev)
 {
 	struct devlink *devlink = hdev->devlink;
 
-	if (!devlink)
-		return;
-
 	devlink_reload_disable(devlink);
 
 	devlink_unregister(devlink);
 
 	devlink_free(devlink);
-
-	hdev->devlink = NULL;
 }

include/net/devlink.h

@@ -32,7 +32,7 @@ struct devlink_dev_stats {
 struct devlink_ops;
 
 struct devlink {
-	struct list_head list;
+	u32 index;
 	struct list_head port_list;
 	struct list_head rate_list;
 	struct list_head sb_list;
@@ -56,6 +56,8 @@ struct devlink {
 			    */
 	u8 reload_failed:1,
 	   reload_enabled:1;
+	refcount_t refcount;
+	struct completion comp;
 	char priv[0] __aligned(NETDEV_ALIGN);
 };