netdev - Re: [RFC net-next 0/8] Introducing subdev bus and devlink extension

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Message-ID: <20210531223711.19359b9a@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Mon, 31 May 2021 22:37:11 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     moyufeng <moyufeng@...wei.com>
Cc:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Parav Pandit <parav@...lanox.com>,
        Or Gerlitz <gerlitz.or@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "michal.lkml@...kovi.net" <michal.lkml@...kovi.net>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        "lipeng (Y)" <lipeng321@...wei.com>,
        Guangbin Huang <huangguangbin2@...wei.com>,
        <shenjian15@...wei.com>, <linyunsheng@...wei.com>,
        "chenhao (DY)" <chenhao288@...ilicon.com>,
        Jiaran Zhang <zhangjiaran@...wei.com>
Subject: Re: [RFC net-next 0/8] Introducing subdev bus and devlink extension

On Mon, 31 May 2021 18:36:12 +0800 moyufeng wrote:
> Hi, Jiri & Jakub
> 
>     Generally, a devlink instance is created for each PF/VF. This
> facilitates the query and configuration of the settings of each
> function. But if some common objects, like the health status of
> the entire ASIC, the data read by those instances will be duplicate.
> 
>     So I wonder do I just need to apply a public devlink instance for the
> entire ASIC to avoid reading the same data? If so, then I can't set
> parameters for each function individually. Or is there a better suggestion
> to implement it?

I don't think there is a great way to solve this today. In my mind
devlink instances should be per ASIC, but I never had to solve this
problem for a multi-function ASIC. 

Can you assume all functions are in the same control domain? Can they
trust each other?