netdev - Re: [PATCH net-next RFC 7/7] bnxt_en: Add bnxt_en initial port params table and register it

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Date:   Thu, 6 Dec 2018 00:57:05 -0800
From:   Michael Chan <michael.chan@...adcom.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>,
        David Miller <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>, Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next RFC 7/7] bnxt_en: Add bnxt_en initial port params
 table and register it

On Wed, Dec 5, 2018 at 11:11 PM Jakub Kicinski
<jakub.kicinski@...ronome.com> wrote:
>
> On Wed, 5 Dec 2018 22:41:43 -0800, Michael Chan wrote:
> >
> > It will be in the BIOS only for a LOM, I think.  For a NIC, it should
> > be in the NIC's NVRAM.
>
> This is all vague.  Could you please clearly state the use case.
>
Well, the WoL setting's use case should be quite simple, right?  If
the card's NVRAM WoL setting is ON, when you plug the card in a slot
that has Vaux power, it will assert PME# when a magic packet is
received.  Again, the WoL setting in this context is similar to other
power up settings such as PCIe Gen2 or Gen3.

Let's say the power up setting is ON and it boots up to Linux for the
first time after receiving a magic packet.  The Linux user can then
run ethtool -s to set the driver's non persistent WoL setting.  It can
be the same as the NVRAM's power up setting, or different.  Ethtool
may support additional WoL packet types that the power up setting does
not support.  Let's say the Linux user sets the ethtool WoL setting to
OFF and shuts down the system.  That card now will not wake up the
system.  But if there is a power failure and power comes back on
later, the card will lose the ethtool setting and go back to the power
up WoL setting, which is ON in this example.