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

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Date:	Tue, 18 Aug 2015 13:37:56 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Netdev <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>,
	Ji??í Pírko <jiri@...nulli.us>
Subject: Re: [PATCH net-next v3] rocker: add debugfs support to dump internal tables

On Tue, Aug 18, 2015 at 11:19 AM, Andrew Lunn <andrew@...n.ch> wrote:
> On Tue, Aug 18, 2015 at 10:18:51AM -0700, Scott Feldman wrote:
>> On Tue, Aug 18, 2015 at 7:01 AM, Andrew Lunn <andrew@...n.ch> wrote:
>> > On Mon, Aug 17, 2015 at 03:36:17PM -0700, sfeldma@...il.com wrote:
>> >> From: Scott Feldman <sfeldma@...il.com>
>> >>
>> >> > tree /sys/kernel/debug/rocker
>> >> /sys/kernel/debug/rocker
>> >> ????????? 5254001235010000
>> >>     ????????? fdb_tbl
>> >>     ????????? internal_vlan_tbl
>> >>     ????????? neigh_tbl
>> >>     ????????? of_dpa_flow_tbl
>> >>     ????????? of_dpa_group_tbl
>> >>
>> >> 1 directory, 5 files
>> >>
>> >> > cat /sys/kernel/debug/rocker/5254001235010000/internal_vlan_tbl
>> >> ifindex 5 ref_count 1 vlan 3843
>> >> ifindex 7 ref_count 2 vlan 3840
>> >> ifindex 4 ref_count 1 vlan 3842
>> >>
>> >> > cat /sys/kernel/debug/rocker/5254001235010000/fdb_tbl
>> >> learned 1 pport 1 addr 00:02:00:00:02:00 vlan 3840
>> >> learned 1 pport 2 addr 00:02:00:00:03:00 vlan 3840
>> >>
>> >> > cat /sys/kernel/debug/rocker/5254001235010000/neigh_tbl
>> >> 11.0.0.9 dev sw1p2 ref_count 3 index 1 dst 00:02:00:00:01:00 ttl_check 1
>> >> 11.0.0.1 dev sw1p1 ref_count 3 index 0 dst 00:02:00:00:00:00 ttl_check 1
>> >
>> > Hi Scott
>> >
>> > David is not so keen no debugfs stuff. He already NACKed adding more
>> > than what is currently in DSA:
>> >
>> > https://lkml.org/lkml/2015/7/11/8
>>
>> That patch added writable debugfs files, which I can see might be used
>> as a back-door to program hardware.  That does seem bad.
>
> I fully agreed with respect to write. But if you read the whole
> message, David is also not happy with read only.
>
> I think before you spend too much more time on this, you need some
> indication from David if he is going to merge it or not.

David, please give us guidance on debugfs in drivers/net.  Is there
some criteria we can define to know when it's OK to use debugfs?

-scott
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