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

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Date:   Mon, 27 Sep 2021 06:10:21 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        "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

Hi Sergei,

> 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.

It is a mistake from my side which ended up this variable in this patch.

Function pointers are introduced to avoid more checks and only rx functions pf RZ/G2L are using
this variable. 

It will be clear you to once you finish reviewing the remaining patches(patch 13 - patch 18).

Regards,
Biju

Regards,
Biju

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