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

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Date:   Wed, 12 Sep 2018 08:34:22 +0200
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>
Cc:     Jiří Pírko <jiri@...nulli.us>,
        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

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.