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 10:03:58 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Michael Chan <michael.chan@...adcom.com>
Cc:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        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

Thu, Dec 06, 2018 at 09:57:05AM CET, michael.chan@...adcom.com wrote:
>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

Wouldn't it make sense to also support multiple wol packet types in
devlink param, not just true/false? Your device may not support that but
others may. So enum instead of bool.


>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.