netdev - Re: [PATCH net-next v3] rocker: add debugfs support to dump internal tables

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Message-ID: <56EB3B2D.40509@gmail.com>
Date:	Thu, 17 Mar 2016 16:18:05 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Murali Karicheri <m-karicheri2@...com>,
	Andrew Lunn <andrew@...n.ch>
Cc:	David Miller <davem@...emloft.net>, sfeldma@...il.com,
	netdev@...r.kernel.org, jiri@...nulli.us
Subject: Re: [PATCH net-next v3] rocker: add debugfs support to dump internal
 tables

On 17/03/16 13:48, Murali Karicheri wrote:
> On 03/17/2016 04:25 PM, Andrew Lunn wrote:
>> On Thu, Mar 17, 2016 at 04:10:31PM -0400, Murali Karicheri wrote:
>>> David,
>>>
>>> On 08/18/2015 04:47 PM, David Miller wrote:
>>>> I see some drivers where the foo_debugfs.c file is larger than the rest
>>>> of the driver.  Once people start using it, it's like crack, and they
>>>> dump every single debugging widget they found useful at some point into
>>>> there.
>>>>
>>>> This is not what we want.  Most things I see in debugfs support was
>>>> probably useful for debugging one particular bug but then it was never
>>>> really useful again in the future.  Those kinds of things can be done
>>>> locally in someone's tree.
>>>>
>>>> I often see various kinds of "statistics" ending up in these things,
>>>> or register dumps, both of which are 'ethtool' or similar material.
>>> Very late to this discussion, but I need to port some of the internal code
>>> to display the content of a ALE (Address Learning Engine) table maintained
>>> in hardwareat L2 layer. Currently I have a sysfs implementation that dumps
>>> information like below.
>>>
>>> root@...-evm:~# cat /sys/devices/platform/soc/2620110.netcp/ale_table
>>> index 0, raw: 000007fc d000ffff ffffffff, type: addr(1), addr: ff:ff:ff:ff:ff:ff, mcstate: f(3), port mask: 1ff, no super
>>> index 1, raw: 00000000 10000800 28329a1c, type: addr(1), addr: 08:00:28:32:9a:1c, uctype: persistent(0), port: 0
>>> index 2, raw: 000007fc d0000100 5e000001, type: addr(1), addr: 01:00:5e:00:00:01, mcstate: f(3), port mask: 1ff, no super
>>> index 19, raw: 00000004 d000d4be d93db6c1, type: addr(1), addr: d4:be:d9:3d:b6:c1, uctype: touched(3), port: 1
>>>
>>> What is the available interface in kernel to expose this information
>>> to user space as debugfs is not suggested based on this thread?
>>
>> This looks a lot like what the mv88e6xxx_port_fdb_dump() callback
>> returns to DSA when SWITCHDEV_OBJ_ID_PORT_FDB is passed to
>> switchdev_port_obj_dump() in the switchdev ops.
>>
> Andrew,
> 
> Which tool user has to use to get this dump once implemented?

iproute2's bridge command with bridge fdb show <interface>.
-- 
Florian