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

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Message-ID: <CAMuHMdWuoLFDRbJZqpvT48q1zbH05tqerWMs50aFDa6pR+ecAg@mail.gmail.com>
Date:   Mon, 9 Aug 2021 14:06:28 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Biju Das <biju.das.jz@...renesas.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        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 <netdev@...r.kernel.org>,
        Linux-Renesas <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 Biju,

On Mon, Aug 2, 2021 at 12:27 PM Biju Das <biju.das.jz@...renesas.com> 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>

Thanks for your patch!

> --- 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;

Why not "unsigned int"? ...
This comment applies to a few more subsequent patches.

> +};
> +
>  struct ravb_private {
>         struct net_device *ndev;
>         struct platform_device *pdev;
> @@ -1040,6 +1045,8 @@ struct ravb_private {
>         unsigned txcidm:1;              /* TX Clock Internal Delay Mode */
>         unsigned rgmii_override:1;      /* Deprecated rgmii-*id behavior */
>         int num_tx_desc;                /* TX descriptors per packet */

... oh, here's the original culprit.

> +
> +       const struct ravb_hw_info *info;
>  };
>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds