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From:   Heiko Stuebner <heiko@sntech.de>
To:     Carlos de Paula <me@carlosedp.com>
Cc:     papadakospan@gmail.com, jose.abreu@synopsys.com,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Jonas Karlman <jonas@kwiboo.se>,
        Peter Geis <pgwipeout@gmail.com>,
        Katsuhiro Suzuki <katsuhiro@katsuster.net>,
        Johan Jonker <jbx6244@gmail.com>,
        Philipp Tomsich <philipp.tomsich@theobroma-systems.com>,
        Christoph Muellner <christoph.muellner@theobroma-systems.com>,
        Enric Balletbo i Serra <enric.balletbo@collabora.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm64: dts: rockchip: Add txpbl node for RK3399/RK3328
Date:   Sun, 01 Mar 2020 01:25:16 +0100
Message-ID: <6132615.msM8OCcsVu@phil>
In-Reply-To: <20200218221040.10955-1-me@carlosedp.com>
References: <20200218221040.10955-1-me@carlosedp.com>
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Am Dienstag, 18. Februar 2020, 23:10:37 CET schrieb Carlos de Paula:
> Some rockchip SoCs like the RK3399 and RK3328 exhibit an issue
> where tx checksumming does not work with packets larger than 1498.
> 
> The default Programmable Buffer Length for TX in these GMAC's is
> not suitable for MTUs higher than 1498. The workaround is to disable
> TX offloading with 'ethtool -K eth0 tx off rx off' causing performance
> impacts as it disables hardware checksumming.
> 
> This patch sets snps,txpbl to 0x4 which is a safe number tested ok for
> the most popular MTU value of 1500.
> 
> For reference, see https://lkml.org/lkml/2019/4/1/1382.
> 
> Signed-off-by: Carlos de Paula <me@carlosedp.com>

applied for 5.7

Thanks
Heiko