netdev - RE: [RFC/PATCH 11/18] ravb: Add rx_2k_buffers to struct ravb_hw

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Date:   Sun, 26 Sep 2021 15:48:01 +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: [RFC/PATCH 11/18] ravb: Add rx_2k_buffers to struct ravb_hw_info

Hi Sergei,

> Subject: Re: [RFC/PATCH 11/18] ravb: Add rx_2k_buffers to struct
> ravb_hw_info
> 
> On 9/23/21 5:08 PM, Biju Das wrote:
> 
> > R-Car AVB-DMAC has Maximum 2K size on RZ buffer.
> > We need to Allow for changing the MTU within the limit of the maximum
> > size of a descriptor (2048 bytes).
> >
> > Add a rx_2k_buffers hw feature bit to struct ravb_hw_info to add this
> > constraint only for R-Car.
> >
> > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> > ---
> >  drivers/net/ethernet/renesas/ravb.h      | 1 +
> >  drivers/net/ethernet/renesas/ravb_main.c | 8 ++++++--
> >  2 files changed, 7 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/renesas/ravb.h
> > b/drivers/net/ethernet/renesas/ravb.h
> > index 7532cb51d7b8..ab4909244276 100644
> > --- a/drivers/net/ethernet/renesas/ravb.h
> > +++ b/drivers/net/ethernet/renesas/ravb.h
> > @@ -1033,6 +1033,7 @@ struct ravb_hw_info {
> >  	unsigned magic_pkt:1;		/* E-MAC supports magic packet
> detection */
> >  	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
> */
> 
>    It seems more flexible to specify the buffer size, not just a bit like
> this...

Agreed, will use rx_max_buf_size variable on the next version.

Regards,
Biju