netdev - Re: [RFC/PATCH 12/18] ravb: Add timestamp to struct ravb_hw

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Message-ID: <ea925b7f-fcc7-d21f-c3bb-6fb8d210bbb2@gmail.com>
Date:   Sun, 26 Sep 2021 23:48:58 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Sergey Shtylyov <s.shtylyov@....ru>,
        Biju Das <biju.das.jz@...renesas.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Andrew Lunn <andrew@...n.ch>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Adam Ford <aford173@...il.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>
Subject: Re: [RFC/PATCH 12/18] ravb: Add timestamp to struct ravb_hw_info

On 9/26/21 11:45 PM, Sergey Shtylyov wrote:

>>> -----Original Message-----
>>> Subject: Re: [RFC/PATCH 12/18] ravb: Add timestamp to struct ravb_hw_info
>>>
>>> On 9/23/21 5:08 PM, Biju Das wrote:
>>>
>>>> R-Car AVB-DMAC supports timestamp feature.
>>>> Add a timestamp hw feature bit to struct ravb_hw_info to add this
>>>> feature only for R-Car.
>>>>
>>>> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
>>>> ---
>>>>  drivers/net/ethernet/renesas/ravb.h      |  2 +
>>>>  drivers/net/ethernet/renesas/ravb_main.c | 68
>>>> +++++++++++++++---------
>>>>  2 files changed, 45 insertions(+), 25 deletions(-)
>>>>
>>>> diff --git a/drivers/net/ethernet/renesas/ravb.h
>>>> b/drivers/net/ethernet/renesas/ravb.h
>>>> index ab4909244276..2505de5d4a28 100644
>>>> --- a/drivers/net/ethernet/renesas/ravb.h
>>>> +++ b/drivers/net/ethernet/renesas/ravb.h
>>>> @@ -1034,6 +1034,7 @@ struct ravb_hw_info {
>>>>  	unsigned mii_rgmii_selection:1;	/* E-MAC supports mii/rgmii
>>> selection */
>>>>  	unsigned half_duplex:1;		/* E-MAC supports half duplex mode */
>>>>  	unsigned rx_2k_buffers:1;	/* AVB-DMAC has Max 2K buf size on RX
>>> */
>>>> +	unsigned timestamp:1;		/* AVB-DMAC has timestamp */
>>>
>>>    Isn't this a matter of the gPTP support as well, i.e. no separate flag
>>> needed?
>>
>> Agreed. Previously it is suggested to use timestamp. I will change it to as part of gPTP support cases.
> 
>    TIA. :-)
> 
>>>
>>> [...]
>>>> @@ -1089,6 +1090,7 @@ struct ravb_private {
>>>>  	unsigned int num_tx_desc;	/* TX descriptors per packet */
>>>>
>>>>  	int duplex;
>>>> +	struct ravb_rx_desc *rgeth_rx_ring[NUM_RX_QUEUE];
>>>
>>>    Strange place to declare this...
>>
>> Agreed. This has to be on later patch. Will move it.
> 
>    I only meant that these fields should go together with rx_ring[]. Apparently

   Sorry, this field.

> we have a case of wrong patch ordering here (as this patch needs this field declared)...
[...]

>> Regards,
>> Biju

MBR, Sergey