netdev - Re: [patch net-next 02/10] devlink: Add support for resource abstraction

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Date:   Mon, 25 Dec 2017 13:12:07 +0200
From:   Arkadi Sharshevsky <arkadis@...lanox.com>
To:     David Miller <davem@...emloft.net>, jiri@...nulli.us
Cc:     netdev@...r.kernel.org, mlxsw@...lanox.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        michael.chan@...adcom.com, ganeshgr@...lsio.com,
        saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
        idosch@...lanox.com, jakub.kicinski@...ronome.com, ast@...nel.org,
        daniel@...earbox.net, simon.horman@...ronome.com,
        pieter.jansenvanvuuren@...ronome.com, john.hurley@...ronome.com,
        alexander.h.duyck@...el.com, linville@...driver.com,
        gospo@...adcom.com, steven.lin1@...adcom.com, yuvalm@...lanox.com,
        ogerlitz@...lanox.com, dsa@...ulusnetworks.com,
        roopa@...ulusnetworks.com
Subject: Re: [patch net-next 02/10] devlink: Add support for resource
 abstraction



On 12/20/2017 09:43 PM, David Miller wrote:
> From: Jiri Pirko <jiri@...nulli.us>
> Date: Wed, 20 Dec 2017 12:58:13 +0100
> 
>> From: Arkadi Sharshevsky <arkadis@...lanox.com>
>>
>> Add support for hardware resource abstraction over devlink. Each resource
>> is identified via id, furthermore it contains information regarding its
>> size and its related sub resources. Each resource can also provide its
>> current occupancy.
>>
>> In some cases the sizes of some resources can be changed, yet for those
>> changes to take place a hot driver reload may be needed. The reload
>> capability will be introduced in the next patch.
>>
>> Signed-off-by: Arkadi Sharshevsky <arkadis@...lanox.com>
>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> 
> In what units are these sizes?  If it depends upon the resource, it would
> be great to have a way to introspect the units given a resource.
> 

This is problematic. Currently the units are actually double words
(single entry is 64 bit) because this resource is a actually a memory.
So my first thought was adding an enum in UAPI of resource_units

enum resource_units {
	DEVLINK_RESOURCE_UNITS_WORD,
	DEVLINK_RESOURCE_UNITS_DOUBLE_WORD,
	DEVLINK_RESOURCE_UNITS_ITEM, /* this is in order to define some
                                        driver specific stuff*/
        ...
};

But the 'item' is too vague, because for example, we will have the
RIF bank as resource. What unit will it have? rifs? items?

Any inputs on this?


>> +	struct devlink_resource_ops *resource_ops;
> 
> Const?
> 
>> +static inline int
>> +devlink_resource_register(struct devlink *devlink,
>> +			  const char *resource_name,
>> +			  bool top_hierarchy,
>> +			  u64 resource_size,
>> +			  u64 resource_id,
>> +			  u64 parent_resource_id,
>> +			  struct devlink_resource_ops *resource_ops)
> 
> Const for resource_ops?
> 
>> +int devlink_resource_register(struct devlink *devlink,
>> +			      const char *resource_name,
>> +			      bool top_hierarchy,
>> +			      u64 resource_size,
>> +			      u64 resource_id,
>> +			      u64 parent_resource_id,
>> +			      struct devlink_resource_ops *resource_ops)
> 
> Likewise.
>