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

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Date:   Mon, 2 Aug 2021 23:42:18 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Biju Das <biju.das.jz@...renesas.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, 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

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? :-)

[...]

MBR, Sergei