netdev - Re: [PATCH 4/7] sh_eth: offload RX checksum on R8A7740

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Message-ID: <CAMuHMdUixqEcD36ReZj4noF5VOCNHS-qH_9herABkiLSVD3R8A@mail.gmail.com>
Date:   Tue, 29 Jan 2019 19:20:15 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:     netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: [PATCH 4/7] sh_eth: offload RX checksum on R8A7740

Hi Sergei,

On Sun, Jan 27, 2019 at 6:41 PM Sergei Shtylyov
<sergei.shtylyov@...entembedded.com> wrote:
> The R-Mobile A1 (R8A7740) SoC manual describes the Ether MAC's RX checksum
> offload the same way as it's implemented in the EtherAVB MAC...
>
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

Thanks for your patch!

Running netperf as described in patch 2/7, perf tells me there's a reduction
for csum_partial from ca. 1.9% to 0.01%, so this feature seems to work.

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

However, while effective according to perf results, using ethtool to
enable/disable
the feature prints an error message:

root@...adillo:~# ethtool -K eth0 rx on
Cannot get device udp-fragmentation-offload settings: Operation not supported
Cannot get device udp-fragmentation-offload settings: Operation not supported
root@...adillo:~# ethtool -K eth0 rx off
Cannot get device udp-fragmentation-offload settings: Operation not supported
Cannot get device udp-fragmentation-offload settings: Operation not supported
root@...adillo:~#

Do you have any clue?

Does this needs testing on R-Mobile A1 with VLAN enabled, too, or is that
independent from the underlying sh-eth hardware version?

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