55 lines
1.7 KiB
Diff
55 lines
1.7 KiB
Diff
From 8a469ee35606ba65448d54e5a2a23302f7e79e3c Mon Sep 17 00:00:00 2001
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From: Carlos de Paula <me@carlosedp.com>
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Date: Tue, 18 Feb 2020 17:10:37 -0500
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Subject: [PATCH] arm64: dts: rockchip: Add txpbl node for RK3399/RK3328
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Some rockchip SoCs like the RK3399 and RK3328 exhibit an issue
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where tx checksumming does not work with packets larger than 1498.
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The default Programmable Buffer Length for TX in these GMAC's is
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not suitable for MTUs higher than 1498. The workaround is to disable
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TX offloading with 'ethtool -K eth0 tx off rx off' causing performance
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impacts as it disables hardware checksumming.
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This patch sets snps,txpbl to 0x4 which is a safe number tested ok for
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the most popular MTU value of 1500.
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For reference, see https://lkml.org/lkml/2019/4/1/1382.
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Signed-off-by: Carlos de Paula <me@carlosedp.com>
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Link: https://lore.kernel.org/r/20200218221040.10955-1-me@carlosedp.com
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Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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---
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arch/arm64/boot/dts/rockchip/rk3328.dtsi | 2 ++
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arch/arm64/boot/dts/rockchip/rk3399.dtsi | 1 +
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2 files changed, 3 insertions(+)
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--- a/arch/arm64/boot/dts/rockchip/rk3328.dtsi
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+++ b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
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@@ -857,6 +857,7 @@
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resets = <&cru SRST_GMAC2IO_A>;
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reset-names = "stmmaceth";
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rockchip,grf = <&grf>;
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+ snps,txpbl = <0x4>;
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status = "disabled";
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};
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@@ -878,6 +879,7 @@
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reset-names = "stmmaceth", "mac-phy";
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phy-mode = "rmii";
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phy-handle = <&phy>;
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+ snps,txpbl = <0x4>;
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status = "disabled";
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mdio {
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--- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
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+++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
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@@ -288,6 +288,7 @@
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resets = <&cru SRST_A_GMAC>;
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reset-names = "stmmaceth";
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rockchip,grf = <&grf>;
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+ snps,txpbl = <0x4>;
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status = "disabled";
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};
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