netdev - Re: [PATCH] sh_eth: add wake-on-lan support via magic packet

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Date:   Wed, 7 Dec 2016 19:14:40 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>
Cc:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Simon Horman <horms+renesas@...ge.net.au>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH] sh_eth: add wake-on-lan support via magic packet

Hi Niklas,

On Wed, Dec 7, 2016 at 5:28 PM, Niklas Söderlund
<niklas.soderlund+renesas@...natech.se> wrote:
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

Thanks, works fine on r8a7791/koelsch!

Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>

> --- a/drivers/net/ethernet/renesas/sh_eth.c
> +++ b/drivers/net/ethernet/renesas/sh_eth.c
> @@ -624,7 +624,7 @@ static struct sh_eth_cpu_data r8a779x_data = {
>
>         .register_type  = SH_ETH_REG_FAST_RCAR,
>
> -       .ecsr_value     = ECSR_PSRTO | ECSR_LCHNG | ECSR_ICD,
> +       .ecsr_value     = ECSR_PSRTO | ECSR_LCHNG | ECSR_ICD | ECSR_MPD,

Interestingly, the ECSR_MPD bit is already set for several SoCs.

Hence adding ".magic = 1" to the entry for r8a7740 instantly gave me working
WoL support on r8a7740/armadillo. Cool!

> --- a/drivers/net/ethernet/renesas/sh_eth.h
> +++ b/drivers/net/ethernet/renesas/sh_eth.h
> @@ -493,6 +493,7 @@ struct sh_eth_cpu_data {
>         unsigned shift_rd0:1;   /* shift Rx descriptor word 0 right by 16 */
>         unsigned rmiimode:1;    /* EtherC has RMIIMODE register */
>         unsigned rtrate:1;      /* EtherC has RTRATE register */
> +       unsigned magic:1;       /* EtherC have PMDE in ECMR and MPDIP in ECSIPR */

Instead of adding a new flag, perhaps you can just check for the ECSR_MPD flag
in ecsr_value?

> @@ -529,6 +530,9 @@ struct sh_eth_private {
>         unsigned no_ether_link:1;
>         unsigned ether_link_active_low:1;
>         unsigned is_opened:1;
> +
> +       bool wol_enabled;

"unsigned wol_enabled:1", to merge with the bitfield above?

> +       struct clk *clk;

It's a good practice to keep all pointers at the top of the struct, to avoid
gaps due to alignment restrictions, especially on 64-bit (I know that's not
the case here).

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