netdev - Re: [patch net-next v2 00/10] Add support for resource abstraction

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Date:   Thu, 4 Jan 2018 02:07:15 +0200
From:   Arkadi Sharshevsky <arkadis@...lanox.com>
To:     David Ahern <dsa@...ulusnetworks.com>,
        Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com,
        davem@...emloft.net, 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
Subject: Re: [patch net-next v2 00/10] Add support for resource abstraction



On 01/03/2018 08:29 PM, David Ahern wrote:
> On 1/3/18 11:17 AM, Jiri Pirko wrote:
>> Wed, Jan 03, 2018 at 07:14:16PM CET, dsa@...ulusnetworks.com wrote:
>>> On 1/3/18 11:05 AM, Arkadi Sharshevsky wrote:
>>>> As I stated this is a user-space bug which I fixed, and updated my repo
>>>> so please pull. Devlink uses mnl,and currently mnl does not support
>>>> extended ack. I added support for this in my local ver of libmnl:
>>>>
>>>> https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Farkadis%2Flibmnl.git&data=02%7C01%7Carkadis%40mellanox.com%7C5c86b6240eb84459c6ae08d552d7f9a4%7Ca652971c7d2e4d9ba6a4d149256f461b%7C0%7C0%7C636506009929977440&sdata=sgrNzMhPwe63BIVxexZTjl%2FXqW51kpuRiHVhTDNaa70%3D&reserved=0
>>>>
>>>> On branch master, so you can check it out. Besides this bugs, which were
>>>> userspace, can please specify what are the pending problems from your
>>>> point of view? Thanks!
>>>
>>> devlink is in iproute2 package and it has extack support. See 'git log
>>> lib/libnetlink.c'
>>
>> Dave, devlink uses libmnl.
>>
> 
> Now I remember. You wrote it independently and but needed iproute2 be a
> delivery vehicle. It uses none of the common infrastructure from
> iproute2. Could we make this more difficult ....
> 
> Sometime in the next day I will jump through the hoops to get a proper
> devlink command.
> 

This actually was very confusing, I think the extack should be
handled by libmnl and iproute should use mnl_cb_run() routines
and not to implement its own. That way we could both benefit
from that.

You actually do use libmnl in libnetlink.c only for parsing
the headers, and its a dependency for extack handling.

I see this as a completely independent user space issue, which
doesn't have to do anything with this patchset. Not to mention
that everything is working right now.