netdev - Re: [patch net-next 00/11] mlxsw: Implement dev info and dev flash for line cards

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Date:   Wed, 15 Jun 2022 19:40:34 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Ido Schimmel <idosch@...dia.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        petrm@...dia.com, pabeni@...hat.com, edumazet@...gle.com,
        mlxsw@...dia.com
Subject: Re: [patch net-next 00/11] mlxsw: Implement dev info and dev flash
 for line cards

Wed, Jun 15, 2022 at 11:13:35AM CEST, idosch@...dia.com wrote:
>On Tue, Jun 14, 2022 at 02:33:15PM +0200, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@...dia.com>
>> 
>> This patchset implements two features:
>> 1) "devlink dev info" is exposed for line card (patches 3-8)
>> 2) "devlink dev flash" is implemented for line card gearbox
>>    flashing (patch 9)
>> 
>> For every line card, "a nested" auxiliary device is created which
>> allows to bind the features mentioned above (patch 2).
>
>The design choice to use an auxiliary device for each line card needs to
>be explained in the cover letter. From what I can tell, the motivation
>is to reuse the above devlink uAPI for line cards as opposed to using
>the "component" attribute or adding new uAPI. This is achieved by
>creating a devlink instance for each line card. The auxiliary device is
>needed because each devlink instance is expected to be associated with a
>device. Does this constitute proper use of the auxiliary bus?

Right, will describe this in cover letter.


>
>> 
>> The relationship between line card and its auxiliary dev devlink
>> is carried over extra line card netlink attribute (patches 1 and 3).
>> 
>> Examples:
>> 
>> $ devlink lc show pci/0000:01:00.0 lc 1
>> pci/0000:01:00.0:
>>   lc 1 state active type 16x100G nested_devlink auxiliary/mlxsw_core.lc.0
>
>Can we try to use the index of the line card as the identifier of the
>auxiliary device?

Not really. We would have a collision if there are 2 mlxsw instances.


>
>>     supported_types:
>>        16x100G
>> 
>> $ devlink dev show auxiliary/mlxsw_core.lc.0
>> auxiliary/mlxsw_core.lc.0
>
>I assume that the auxiliary device cannot outlive line card. Does that
>mean that as part of reload of the primary devlink instance the nested
>devlink instance is removed? If so, did you check the reload flow with
>lockdep to ensure there aren't any problems?

As I wrote in the other email, line card auxdev should be removed during
linecard_fini(), will add that to v2.


>
>> 
>> $ devlink dev info auxiliary/mlxsw_core.lc.0
>> auxiliary/mlxsw_core.lc.0:
>>   versions:
>>       fixed:
>>         hw.revision 0
>>         fw.psid MT_0000000749
>>       running:
>>         ini.version 4
>>         fw 19.2010.1312
>> 
>> $ devlink dev flash auxiliary/mlxsw_core.lc.0 file mellanox/fw-AGB-rel-19_2010_1312-022-EVB.mfa2
>
>How is this firmware activated? It is usually done after reload, but I
>don't see reload implementation for the line card devlink instance.

Currently, only devlink dev reload of the whole mlxsw instance or
unprovision/provision of a line card.

>
>> 
>> Jiri Pirko (11):
>>   devlink: introduce nested devlink entity for line card
>>   mlxsw: core_linecards: Introduce per line card auxiliary device
>>   mlxsw: core_linecard_dev: Set nested devlink relationship for a line
>>     card
>>   mlxsw: core_linecards: Expose HW revision and INI version
>>   mlxsw: reg: Extend MDDQ by device_info
>>   mlxsw: core_linecards: Probe provisioned line cards for devices and
>>     expose FW version
>>   mlxsw: reg: Add Management DownStream Device Tunneling Register
>>   mlxsw: core_linecards: Expose device PSID over device info
>>   mlxsw: core_linecards: Implement line card device flashing
>>   selftests: mlxsw: Check line card info on provisioned line card
>>   selftests: mlxsw: Check line card info on activated line card
>> 
>>  Documentation/networking/devlink/mlxsw.rst    |  24 ++
>>  drivers/net/ethernet/mellanox/mlxsw/Kconfig   |   1 +
>>  drivers/net/ethernet/mellanox/mlxsw/Makefile  |   2 +-
>>  drivers/net/ethernet/mellanox/mlxsw/core.c    |  44 +-
>>  drivers/net/ethernet/mellanox/mlxsw/core.h    |  35 ++
>>  .../mellanox/mlxsw/core_linecard_dev.c        | 180 ++++++++
>>  .../ethernet/mellanox/mlxsw/core_linecards.c  | 403 ++++++++++++++++++
>>  drivers/net/ethernet/mellanox/mlxsw/reg.h     | 173 +++++++-
>>  include/net/devlink.h                         |   2 +
>>  include/uapi/linux/devlink.h                  |   2 +
>>  net/core/devlink.c                            |  42 ++
>>  .../drivers/net/mlxsw/devlink_linecard.sh     |  54 +++
>>  12 files changed, 948 insertions(+), 14 deletions(-)
>>  create mode 100644 drivers/net/ethernet/mellanox/mlxsw/core_linecard_dev.c
>> 
>> -- 
>> 2.35.3
>>