netdev - Re: [PATCH net-next 1/8] devlink: Add generic parameter hw_tc

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Message-ID: <20180913090853.GI25110@nanopsycho>
Date:   Thu, 13 Sep 2018 11:08:53 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>,
        David Miller <davem@...emloft.net>,
        "michael.chan@...adcom.com" <michael.chan@...adcom.com>,
        Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 1/8] devlink: Add generic parameter hw_tc_offload

Wed, Sep 12, 2018 at 08:34:22AM CEST, jakub.kicinski@...ronome.com wrote:
>On Wed, 12 Sep 2018 11:47:59 +0530, Vasundhara Volam wrote:
>> On Tue, Sep 11, 2018 at 3:25 PM Jiri Pirko <jiri@...nulli.us> wrote:
>> >
>> > Tue, Sep 11, 2018 at 10:44:58AM CEST, vasundhara-v.volam@...adcom.com wrote:  
>> > >hw_tc_offload - Enable/Disable TC flower offload in the device.
>> > >
>> > >Signed-off-by: Vasundhara Volam <vasundhara-v.volam@...adcom.com>
>> > >---
>> > > include/net/devlink.h | 4 ++++
>> > > net/core/devlink.c    | 5 +++++
>> > > 2 files changed, 9 insertions(+)
>> > >
>> > >diff --git a/include/net/devlink.h b/include/net/devlink.h
>> > >index b9b89d6..a0e9ce9 100644
>> > >--- a/include/net/devlink.h
>> > >+++ b/include/net/devlink.h
>> > >@@ -362,6 +362,7 @@ enum devlink_param_generic_id {
>> > >       DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
>> > >       DEVLINK_PARAM_GENERIC_ID_ENABLE_SRIOV,
>> > >       DEVLINK_PARAM_GENERIC_ID_REGION_SNAPSHOT,
>> > >+      DEVLINK_PARAM_GENERIC_ID_HW_TC_OFFLOAD,  
>> >
>> > Could you please describe why do you need this here and why the
>> > tc_offload flag in ethtool is not enough. How do you imagine the user
>> > should use them together?  
>> Jiri, tc_offload flag in ethtool will modify feature in driver at
>> runtime. But I am adding
>> tc_offload param here to toggle this feature in NVM Config of our
>> adapter, whose configuration
>> mode is permanent and will be effective only with a reboot of the server.
>> 
>> User has to turn on tc_offload feature in NVM config of the adapter and then
>> enabling the tc_offload flag in ethtool will completely enable the
>> feature in driver.
>
>Thanks for explaining, however, I don't think we have trouble
>understanding *what* you are doing, but rather *why* you're doing it.

Exactly. Why ethtool tc_offload flag is not enough?