netdev - Re: [PATCH net-next 1/3] igc: remove I226 Qbv BaseTime restriction

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Date:   Wed, 4 Jan 2023 09:30:48 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Tony Nguyen <anthony.l.nguyen@...el.com>
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com,
        Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>,
        netdev@...r.kernel.org, sasha.neftin@...el.com,
        Tan Tee Min <tee.min.tan@...ux.intel.com>,
        Naama Meir <naamax.meir@...ux.intel.com>
Subject: Re: [PATCH net-next 1/3] igc: remove I226 Qbv BaseTime restriction

On Tue, Jan 03, 2023 at 03:05:01PM -0800, Tony Nguyen wrote:
> From: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>
> 
> Remove the Qbv BaseTime restriction for I226 so that the BaseTime can be
> scheduled to the future time. A new register bit of Tx Qav Control
> (Bit-7: FutScdDis) was introduced to allow I226 scheduling future time as
> Qbv BaseTime and not having the Tx hang timeout issue.
> 
> Besides, according to datasheet section 7.5.2.9.3.3, FutScdDis bit has to
> be configured first before the cycle time and base time.
> 
> Indeed the FutScdDis bit is only active on re-configuration, thus we have
> to set the BASET_L to zero and then only set it to the desired value.
> 
> Please also note that the Qbv configuration flow is moved around based on
> the Qbv programming guideline that is documented in the latest datasheet.
> 
> Co-developed-by: Tan Tee Min <tee.min.tan@...ux.intel.com>
> Signed-off-by: Tan Tee Min <tee.min.tan@...ux.intel.com>
> Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>
> Tested-by: Naama Meir <naamax.meir@...ux.intel.com>
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
> ---
>  drivers/net/ethernet/intel/igc/igc_base.c    | 29 +++++++++++++
>  drivers/net/ethernet/intel/igc/igc_base.h    |  2 +
>  drivers/net/ethernet/intel/igc/igc_defines.h |  1 +
>  drivers/net/ethernet/intel/igc/igc_main.c    |  5 ++-
>  drivers/net/ethernet/intel/igc/igc_tsn.c     | 44 +++++++++++++-------
>  5 files changed, 65 insertions(+), 16 deletions(-)
> 

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...dia.com>