netdev - RE: [PATCH net-next 12/13] ravb: Factorise ravb_emac

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Date:   Sat, 28 Aug 2021 09:34:23 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     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>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        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: [PATCH net-next 12/13] ravb: Factorise ravb_emac_init function

Hi Sergei,

Thanks for the feedback.

> Subject: Re: [PATCH net-next 12/13] ravb: Factorise ravb_emac_init
> function
> 
> On 8/25/21 10:01 AM, Biju Das wrote:
> 
> > The E-MAC IP on the R-Car AVB module has different initialization
> > parameters for RX frame size, duplex settings, different offset for
> > transfer speed setting and has magic packet detection support compared
> > to E-MAC on RZ/G2L Gigabit Ethernet module. Factorise the
> > ravb_emac_init function to support the later SoC.
> 
>    Again, couldn't we resolve these differencies like the sh_eth driver
> does, by adding the register values into the *struct* ravb_hw_info?


I will evaluate your proposal in terms of code size and data size
And with the current code and share the details in next RFC patchset
for supporting RZ/G2L with emac_init function.
Based on the RFC discussion, we can conclude it.

Currently by looking at your proposal, I am seeing duplication of
Data in R-Car Gen3 and R-Car Gen2.

Multiple if statement for handling duplex, initialising CSR0(Checksum operating mode register),
CXR31(In-band status register)


Regards,
Biju


> 
> > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> > Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> [...]
> 
> MBR, Sergey