netdev - Re: [PATCH net-next 0/9] devlink: Add support for region access

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Date:   Fri, 30 Mar 2018 12:24:42 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
Cc:     Andrew Lunn <andrew@...n.ch>, Alex Vesker <valex@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Tariq Toukan <tariqt@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>
Subject: Re: [PATCH net-next 0/9] devlink: Add support for region access

Fri, Mar 30, 2018 at 11:51:57AM CEST, rahul.lakkireddy@...lsio.com wrote:
>On Thursday, March 03/29/18, 2018 at 23:53:43 +0530, Andrew Lunn wrote:
>> On Thu, Mar 29, 2018 at 07:07:43PM +0300, Alex Vesker wrote:
>> > This is a proposal which will allow access to driver defined address
>> > regions using devlink. Each device can create its supported address
>> > regions and register them. A device which exposes a region will allow
>> > access to it using devlink.
>> 
>> Hi Alex
>> 
>> Did you see the work Rahul Lakkireddy has been doing?
>> 
>> https://patchwork.kernel.org/patch/10305935/
>> 
>> It seems like these are similar, or at least overlapping. We probably
>> want one solution for both.
>> 
>
>We're already collecting hardware snapshots when system is live with
>ethtool --getdump (which devlink tool is now trying to do).

Ethtool is definitelly a wrong tool for this. It uses netdev as a
handle, but the dumps happen on a parent device - represented by a
devlink instance.
Also, in devlink we have notifications so a deamon can actually listen
on a socket to see if there is new dump available due to a critical
event etc.


>
>We are now in the process of adding support to collect hardware
>snapshots during kernel panic.
>
>Thanks,
>Rahul