netdev - RE: [PATCH net-next v2 1/8] ravb: Add struct ravb_hw

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Date:   Tue, 3 Aug 2021 06:36:46 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Biju Das <biju.das.jz@...renesas.com>,
        Sergei Shtylyov <sergei.shtylyov@...il.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 1/8] ravb: Add struct ravb_hw_info to driver
 data

Hi Sergei,

> Subject: RE: [PATCH net-next v2 1/8] ravb: Add struct ravb_hw_info to
> driver data
> 
> Hi Sergei,
> 
> Thanks for the feedback.
> 
> > Subject: Re: [PATCH net-next v2 1/8] ravb: Add struct ravb_hw_info to
> > driver data
> >
> > On 8/2/21 1:26 PM, Biju Das wrote:
> >
> > > The DMAC and EMAC blocks of Gigabit Ethernet IP found on RZ/G2L SoC
> > > are similar to the R-Car Ethernet AVB IP. With a few changes in the
> > > driver we can support both IPs.
> > >
> > > Currently a runtime decision based on the chip type is used to
> > > distinguish the HW differences between the SoC families.
> > >
> > > The number of TX descriptors for R-Car Gen3 is 1 whereas on R-Car
> > > Gen2 and RZ/G2L it is 2. For cases like this it is better to select
> > > the number of TX descriptors by using a structure with a value,
> > > rather than a runtime decision based on the chip type.
> > >
> > > This patch adds the num_tx_desc variable to struct ravb_hw_info and
> > > also replaces the driver data chip type with struct ravb_hw_info by
> > > moving chip type to it.
> > >
> > > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> > > Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > ---
> > > v2:
> > >  * Incorporated Andrew and Sergei's review comments for making it
> > smaller patch
> > >    and provided detailed description.
> > > ---
> > >  drivers/net/ethernet/renesas/ravb.h      |  7 +++++
> > >  drivers/net/ethernet/renesas/ravb_main.c | 38
> > > +++++++++++++++---------
> > >  2 files changed, 31 insertions(+), 14 deletions(-)
> > >
> > > diff --git a/drivers/net/ethernet/renesas/ravb.h
> > > b/drivers/net/ethernet/renesas/ravb.h
> > > index 80e62ca2e3d3..cfb972c05b34 100644
> > > --- a/drivers/net/ethernet/renesas/ravb.h
> > > +++ b/drivers/net/ethernet/renesas/ravb.h
> > > @@ -988,6 +988,11 @@ enum ravb_chip_id {
> > >  	RCAR_GEN3,
> > >  };
> > >
> > > +struct ravb_hw_info {
> > > +	enum ravb_chip_id chip_id;
> > > +	int num_tx_desc;
> >
> >    I think this is rather the driver's choice, than the h/w feature...
> > Perhaps a rename would help with that? :-)
> 
> It is consistent with current naming convention used by the driver.
> NUM_TX_DESC macro is replaced by num_tx_desc.
      
So the name should be ok. 

Indeed we are agreed to add function pointers to struct ravb_hw_info to avoid another level of indirection.

If the concern is related to duplication of data(ie,priv->num_tx_desc vs info->num_tx_desc)
I have a plan to remove priv->num_tx_desc with info->num_tx_desc  later.

Regards,
Biju