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

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Message-ID: <CAACQVJrNyDXCuEFRVWcVh9tpb4_8WpLJ3U+ufm8TXcVYncHD6A@mail.gmail.com>
Date:   Wed, 12 Sep 2018 11:47:59 +0530
From:   Vasundhara Volam <vasundhara-v.volam@...adcom.com>
To:     Jiří Pírko <jiri@...nulli.us>
Cc:     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 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.