netdev - Re: [PATCH v3 net-next 0/6] bnxt_en: Add 'enable_live_dev_reset' and 'allow_live_dev

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Date:   Mon, 1 Jun 2020 11:52:17 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>
Cc:     David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>,
        Michael Chan <michael.chan@...adcom.com>
Subject: Re: [PATCH v3 net-next 0/6] bnxt_en: Add 'enable_live_dev_reset' and
 'allow_live_dev_reset' generic devlink params.

Mon, Jun 01, 2020 at 10:58:09AM CEST, vasundhara-v.volam@...adcom.com wrote:
>On Mon, Jun 1, 2020 at 12:13 PM Jiri Pirko <jiri@...nulli.us> wrote:
>>
>> Mon, Jun 01, 2020 at 08:18:19AM CEST, jiri@...nulli.us wrote:
>> >Sun, May 31, 2020 at 09:03:39AM CEST, vasundhara-v.volam@...adcom.com wrote:
>> >>Live device reset capability allows the users to reset the device in real
>> >>time. For example, after flashing a new firmware image, this feature allows
>> >>a user to initiate the reset immediately from a separate command, to load
>> >>the new firmware without reloading the driver or resetting the system.
>> >>
>> >>When device reset is initiated, services running on the host interfaces
>> >>will momentarily pause and resume once reset is completed, which is very
>> >>similar to momentary network outage.
>> >>
>> >>This patchset adds support for two new generic devlink parameters for
>> >>controlling the live device reset capability and use it in the bnxt_en
>> >>driver.
>> >>
>> >>Users can initiate the reset from a separate command, for example,
>> >>'ethtool --reset ethX all' or 'devlink dev reload' to reset the
>> >>device.
>> >>Where ethX or dev is any PF with administrative privileges.
>> >>
>> >>Patchset also updates firmware spec. to 1.10.1.40.
>> >>
>> >>
>> >>v2->v3: Split the param into two new params "enable_live_dev_reset" and
>> >
>> >Vasundhara, I asked you multiple times for this to be "devlink dev reload"
>> >attribute. I don't recall you telling any argument against it. I belive
>> >that this should not be paramater. This is very tightly related to
>> >reload, could you please have it as an attribute of reload, as I
>> >suggested?
>>
>> I just wrote the thread to the previous version. I understand now why
>> you need param as you require reboot to activate the feature.
>
>Okay.
>>
>> However, I don't think it is correct to use enable_live_dev_reset to
>> indicate the live-reset capability to the user. Params serve for
>> configuration only. Could you please move the indication some place
>> else? ("devlink dev info" seems fitting).
>
>Here we are not indicating the support. If the parameter is set to
>true, we are enabling the feature in firmware and driver after reboot.
>Users can disable the feature by setting the parameter to false and
>reboot. This is the configuration which is enabling or disabling the
>feature in the device.

You are talking about cmode permanent here. I'm talking about cmode
runtime.


>
>>
>> I think that you can do the indication in a follow-up patchset. But
>> please remove it from this one where you do it with params.
>
>Could you please see the complete patchset and use it bnxt_en driver
>to get a clear picture? We are not indicating the support.
>
>Thanks.
>
>>
>>
>> >
>> >Thanks!
>> >
>> >
>> >>"allow_live_dev_reset".
>> >>- Expand the documentation of each param and update commit messages
>> >> accordingly.
>> >>- Separated the permanent configuration mode code to another patch and
>> >>rename the callbacks of the "allow_live_dev_reset" parameter accordingly.
>> >>
>> >>v1->v2: Rename param to "allow_fw_live_reset" from "enable_hot_fw_reset".
>> >>- Update documentation files and commit messages with more details of the
>> >> feature.
>> >>
>> >>Vasundhara Volam (6):
>> >>  devlink: Add 'enable_live_dev_reset' generic parameter.
>> >>  devlink: Add 'allow_live_dev_reset' generic parameter.
>> >>  bnxt_en: Use 'enable_live_dev_reset' devlink parameter.
>> >>  bnxt_en: Update firmware spec. to 1.10.1.40.
>> >>  bnxt_en: Use 'allow_live_dev_reset' devlink parameter.
>> >>  bnxt_en: Check if fw_live_reset is allowed before doing ETHTOOL_RESET
>> >>
>> >> Documentation/networking/devlink/bnxt.rst          |  4 ++
>> >> .../networking/devlink/devlink-params.rst          | 28 ++++++++++
>> >> drivers/net/ethernet/broadcom/bnxt/bnxt.c          | 28 +++++++++-
>> >> drivers/net/ethernet/broadcom/bnxt/bnxt.h          |  2 +
>> >> drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c  | 49 +++++++++++++++++
>> >> drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.h  |  1 +
>> >> drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c  | 17 +++---
>> >> drivers/net/ethernet/broadcom/bnxt/bnxt_hsi.h      | 64 +++++++++++++---------
>> >> include/net/devlink.h                              |  8 +++
>> >> net/core/devlink.c                                 | 10 ++++
>> >> 10 files changed, 175 insertions(+), 36 deletions(-)
>> >>
>> >>--
>> >>1.8.3.1
>> >>