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arm64: dts: rockchip: Add txpbl node for RK3399/RK3328

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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>
Link: https://lore.kernel.org/r/20200218221040.10955-1-me@carlosedp.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Carlos de Paula 2020-02-18 17:10:37 -05:00 committed by Heiko Stuebner
parent 4e2e8418c4
commit 8a469ee356
2 changed files with 3 additions and 0 deletions
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2
arch/arm64/boot/dts/rockchip/rk3328.dtsi
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@ -906,6 +906,7 @@
resets = <&cru SRST_GMAC2IO_A>;
reset-names = "stmmaceth";
rockchip,grf = <&grf>;
snps,txpbl = <0x4>;
status = "disabled";
};
@ -927,6 +928,7 @@
reset-names = "stmmaceth", "mac-phy";
phy-mode = "rmii";
phy-handle = <&phy>;
snps,txpbl = <0x4>;
status = "disabled";
mdio {

1
arch/arm64/boot/dts/rockchip/rk3399.dtsi
View File

@ -288,6 +288,7 @@
resets = <&cru SRST_A_GMAC>;
reset-names = "stmmaceth";
rockchip,grf = <&grf>;
snps,txpbl = <0x4>;
status = "disabled";
};