netdev - Re: [PATCH net-next v7 3/9] devlink: Enable creation of the devlink-rate nodes from the driver

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Date:   Fri, 28 Oct 2022 10:51:16 +0200
From:   "Wilczynski, Michal" <michal.wilczynski@...el.com>
To:     Przemek Kitszel <przemyslaw.kitszel@...el.com>,
        <netdev@...r.kernel.org>
CC:     <alexandr.lobakin@...el.com>, <jacob.e.keller@...el.com>,
        <jesse.brandeburg@...el.com>, <anthony.l.nguyen@...el.com>,
        <kuba@...nel.org>, <ecree.xilinx@...il.com>, <jiri@...nulli.us>
Subject: Re: [PATCH net-next v7 3/9] devlink: Enable creation of the
 devlink-rate nodes from the driver



On 10/27/2022 11:27 PM, Przemek Kitszel wrote:
> From:   Michal Wilczynski <michal.wilczynski@...el.com>
> Date:   Thu, 27 Oct 2022 15:00:43 +0200
>
>> Intel 100G card internal firmware hierarchy for Hierarchicial QoS is very
>> rigid and can't be easily removed. This requires an ability to export
>> default hierarchy to allow user to modify it. Currently the driver is
>> only able to create the 'leaf' nodes, which usually represent the vport.
>> This is not enough for HQoS implemented in Intel hardware.
>>
>> Introduce new function devl_rate_node_create() that allows for creation
>> of the devlink-rate nodes from the driver.
> I would swap the order of paragraphs above.

Why ? First I'm describing the problem, then the solution.
It makes perfect sense to me.

>
> [...]
>
>> @@ -1601,6 +1603,8 @@ void devlink_port_attrs_pci_sf_set(struct devlink_port *devlink_port,
>>   				   u32 controller, u16 pf, u32 sf,
>>   				   bool external);
>>   int devl_rate_leaf_create(struct devlink_port *port, void *priv);
>> +int devl_rate_node_create(struct devlink *devlink, void *priv,  char *node_name,
>> +			  char *parent_name);
> One space to much before `char *node_name`

I think it's not being displayed properly, but
alignment is okay here. checkpatch doesn't
complain.

>
> [...]
>   
>> +/**
>> + * devl_rate_node_create - create devlink rate node
>> + * @devlink: devlink instance
>> + * @priv: driver private data
>> + * @node_name: name of the resulting node
>> + * @parent_name: name of the parent node
>> + *
>> + * Create devlink rate object of type node
>> + */
>> +int devl_rate_node_create(struct devlink *devlink, void *priv, char *node_name, char *parent_name)
>> +{
>> +	struct devlink_rate *rate_node;
>> +	struct devlink_rate *parent;
>> +
>> +	rate_node = devlink_rate_node_get_by_name(devlink, node_name);
>> +	if (!IS_ERR(rate_node))
>> +		return -EEXIST;
>> +
>> +	rate_node = kzalloc(sizeof(*rate_node), GFP_KERNEL);
>> +	if (!rate_node)
>> +		return -ENOMEM;
>> +
>> +	if (parent_name) {
>> +		parent = devlink_rate_node_get_by_name(devlink, parent_name);
>> +		if (IS_ERR(parent))
>> +			return -ENODEV;
> `rate_node` is leaked on error path
>
>> +		rate_node->parent = parent;
>> +		refcount_inc(&rate_node->parent->refcnt);
>> +	}
>> +
>> +	rate_node->type = DEVLINK_RATE_TYPE_NODE;
>> +	rate_node->devlink = devlink;
>> +	rate_node->priv = priv;
>> +
>> +	rate_node->name = kzalloc(DEVLINK_RATE_NAME_MAX_LEN, GFP_KERNEL);
>> +	if (!rate_node->name)
>> +		return -ENOMEM;
>> +
>> +	strscpy(rate_node->name, node_name, DEVLINK_RATE_NAME_MAX_LEN);
> Again a memleak on error path.
> It looks also that we could use kstrndup() instead of kzalloc+strscpy combo.
> Finally, I would centralize memory allocation failures.

Thanks this is a legit problem.
Will fix that and resend.
>
>> +
>> +	refcount_set(&rate_node->refcnt, 1);
>> +	list_add(&rate_node->list, &devlink->rate_list);
>> +	devlink_rate_notify(rate_node, DEVLINK_CMD_RATE_NEW);
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devl_rate_node_create);
>> +
> [...]
>
> --PK