netdev - Re: [PATCH net-next v2 6/8] ravb: Add net_features and net_hw_features to struct ravb_hw

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Message-ID: <d038bed9-def6-9035-18fa-28ee527a149c@gmail.com>
Date:   Fri, 6 Aug 2021 23:20:31 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Biju Das <biju.das.jz@...renesas.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Shtylyov <s.shtylyov@...russia.ru>,
        Adam Ford <aford173@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Yuusuke Ashizuka <ashiduka@...itsu.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH net-next v2 6/8] ravb: Add net_features and
 net_hw_features to struct ravb_hw_info

Hello!

On 8/5/21 10:18 PM, Biju Das wrote:

[...]
>>> On R-Car the checksum calculation on RX frames is done by the E-MAC
>>> module, whereas on RZ/G2L it is done by the TOE.
>>>
>>> TOE calculates the checksum of received frames from E-MAC and outputs
>>> it to DMAC. TOE also calculates the checksum of transmission frames
>>> from DMAC and outputs it E-MAC.
>>>
>>> Add net_features and net_hw_features to struct ravb_hw_info, to
>>> support subsequent SoCs without any code changes in the ravb_probe
>> function.
>>>
>>> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
>>> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>>
>> [...]
>>> diff --git a/drivers/net/ethernet/renesas/ravb.h
>>> b/drivers/net/ethernet/renesas/ravb.h
>>> index b765b2b7d9e9..3df813b2e253 100644
>>> --- a/drivers/net/ethernet/renesas/ravb.h
>>> +++ b/drivers/net/ethernet/renesas/ravb.h
>>> @@ -991,6 +991,8 @@ enum ravb_chip_id {  struct ravb_hw_info {
>>>  	const char (*gstrings_stats)[ETH_GSTRING_LEN];
>>>  	size_t gstrings_size;
>>> +	netdev_features_t net_hw_features;
>>> +	netdev_features_t net_features;
>>
>>    Do we really need both of these here? 
> 
> R-Car has only Rx Checksum on E-Mac, where as Geth supports Rx Check Sum on E-Mac or Rx/Tx CheckSum on TOE.
> So there is a hw difference. Please let me know what is the best way to handle this?

   I meant that we could go with only one field of the net_features... Alternatively, we could use our own
feature bits...

>> It seems like the 'feartures'
>> mirrors the enabled features?
> 
> Can you please explain this little bit?

   Looks like I was wrong. :-)

[...]

> Regards,
> Biju

[...]

MBR, Sergei