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

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Date:   Tue, 3 Aug 2021 05:57:28 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     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,

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 and  the below run time decision based on chip type for H/W configuration for Gen2/Gen3 is replaced by info->num_tx_desc.

priv->num_tx_desc = chip_id == RCAR_GEN2 ? NUM_TX_DESC_GEN2 : NUM_TX_DESC_GEN3;

Please let me know, if I am missing anything,

Previously there is a suggestion to change the generic struct ravb_driver_data(which holds driver differences and HW features) with struct ravb_hw_info. 

Regards,
Biju

> 
> [...]
> 
> MBR, Sergei