linux-kernel - Re: [PATCH v2 2/3] net/ncsi: add NCSI Intel OEM command to keep PHY up

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Date:   Tue, 13 Jul 2021 13:16:09 +0300
From:   Ivan Mikhaylov <i.mikhaylov@...ro.com>
To:     Joel Stanley <joel@....id.au>, Eddie James <eajames@...ux.ibm.com>
CC:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Samuel Mendoza-Jonas <sam@...dozajonas.com>,
        "Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
        Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH v2 2/3] net/ncsi: add NCSI Intel OEM command to keep PHY
 up

On Mon, 2021-07-12 at 10:01 +0000, Joel Stanley wrote:
> On Thu, 8 Jul 2021 at 12:27, Ivan Mikhaylov <i.mikhaylov@...ro.com> wrote:
> > 
> > This allows to keep PHY link up and prevents any channel resets during
> > the host load.
> > 
> > It is KEEP_PHY_LINK_UP option(Veto bit) in i210 datasheet which
> > block PHY reset and power state changes.
> 
> How about using runtime configuration over using kconfig for this, so
> the same kernel config can be used on different machines. Something
> device tree based?

As I see there is already the way with Kconfig option, with previous
broadcom/mellanox get mac address and set affinity for mellanox commands.
I'm not sure about dts based solution. As I see there is two ways:
1. make everything related OEM into dts based options
2. or this way, with Kconfig

> 
> Another option is to use the netlink handler to send the OEM command
> from userspace. Eddie has worked on this for an IBM machine, and I've
> asked him to post those changes. I would prefer the kernel option
> though.
> 

I like the idea, it may help with debugging.

Thanks.
>