netdev - [PATCH net-next 1/2] devlink: Allow parameter registration/unregistration during runtime

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Date:   Thu, 10 Mar 2022 15:12:34 -0800
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     Sridhar Samudrala <sridhar.samudrala@...el.com>,
        netdev@...r.kernel.org, anthony.l.nguyen@...el.com,
        sudheer.mogilappagari@...el.com, amritha.nambiar@...el.com,
        jiri@...dia.com, leonro@...dia.com,
        Bharathi Sreenivas <bharathi.sreenivas@...el.com>
Subject: [PATCH net-next 1/2] devlink: Allow parameter registration/unregistration during runtime

From: Sridhar Samudrala <sridhar.samudrala@...el.com>

commit 7a690ad499e7 ("devlink: Clean not-executed param notifications")
added ASSERTs and removed notifications when devlink parameters are
registered by the drivers after the associated devlink instance is
already registered.
The next patch in this series adds a feature in 'ice' driver that is
only enabled when ADQ queue groups are created and introduces a
devlink parameter to configure this feature per queue group.

To allow dynamic parameter registration/unregistration during runtime,
revert the changes added by the above commit.

Signed-off-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
Signed-off-by: Sudheer Mogilappagari <sudheer.mogilappagari@...el.com>
Tested-by: Bharathi Sreenivas <bharathi.sreenivas@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 net/core/devlink.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index fcd9f6d85cf1..d09f2aa4f48f 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4724,7 +4724,6 @@ static void devlink_param_notify(struct devlink *devlink,
 	WARN_ON(cmd != DEVLINK_CMD_PARAM_NEW && cmd != DEVLINK_CMD_PARAM_DEL &&
 		cmd != DEVLINK_CMD_PORT_PARAM_NEW &&
 		cmd != DEVLINK_CMD_PORT_PARAM_DEL);
-	ASSERT_DEVLINK_REGISTERED(devlink);
 
 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
@@ -10120,8 +10119,6 @@ int devlink_params_register(struct devlink *devlink,
 	const struct devlink_param *param = params;
 	int i, err;
 
-	ASSERT_DEVLINK_NOT_REGISTERED(devlink);
-
 	for (i = 0; i < params_count; i++, param++) {
 		err = devlink_param_register(devlink, param);
 		if (err)
@@ -10152,8 +10149,6 @@ void devlink_params_unregister(struct devlink *devlink,
 	const struct devlink_param *param = params;
 	int i;
 
-	ASSERT_DEVLINK_NOT_REGISTERED(devlink);
-
 	for (i = 0; i < params_count; i++, param++)
 		devlink_param_unregister(devlink, param);
 }
@@ -10173,8 +10168,6 @@ int devlink_param_register(struct devlink *devlink,
 {
 	struct devlink_param_item *param_item;
 
-	ASSERT_DEVLINK_NOT_REGISTERED(devlink);
-
 	WARN_ON(devlink_param_verify(param));
 	WARN_ON(devlink_param_find_by_name(&devlink->param_list, param->name));
 
@@ -10190,6 +10183,7 @@ int devlink_param_register(struct devlink *devlink,
 	param_item->param = param;
 
 	list_add_tail(&param_item->list, &devlink->param_list);
+	devlink_param_notify(devlink, 0, param_item, DEVLINK_CMD_PARAM_NEW);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(devlink_param_register);
@@ -10204,11 +10198,10 @@ void devlink_param_unregister(struct devlink *devlink,
 {
 	struct devlink_param_item *param_item;
 
-	ASSERT_DEVLINK_NOT_REGISTERED(devlink);
-
 	param_item =
 		devlink_param_find_by_name(&devlink->param_list, param->name);
 	WARN_ON(!param_item);
+	devlink_param_notify(devlink, 0, param_item, DEVLINK_CMD_PARAM_DEL);
 	list_del(&param_item->list);
 	kfree(param_item);
 }
@@ -10268,8 +10261,6 @@ int devlink_param_driverinit_value_set(struct devlink *devlink, u32 param_id,
 {
 	struct devlink_param_item *param_item;
 
-	ASSERT_DEVLINK_NOT_REGISTERED(devlink);
-
 	param_item = devlink_param_find_by_id(&devlink->param_list, param_id);
 	if (!param_item)
 		return -EINVAL;
@@ -10283,6 +10274,7 @@ int devlink_param_driverinit_value_set(struct devlink *devlink, u32 param_id,
 	else
 		param_item->driverinit_value = init_val;
 	param_item->driverinit_value_valid = true;
+	devlink_param_notify(devlink, 0, param_item, DEVLINK_CMD_PARAM_NEW);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(devlink_param_driverinit_value_set);
-- 
2.31.1