diff --git a/patch/kernel/rockchip64-current/rk3399-adjust-txpbl-for-mtu-1500.patch b/patch/kernel/rockchip64-current/rk3399-adjust-txpbl-for-mtu-1500.patch
new file mode 100644
index 000000000000..226c90226eaf
--- /dev/null
+++ b/patch/kernel/rockchip64-current/rk3399-adjust-txpbl-for-mtu-1500.patch
@@ -0,0 +1,19 @@
+Default Programmable Buffer Length for TX in rk3399's gmac is not suitable
+for MTUs higher than 1498. The easiest solution would be to disable
+TX offloading but it is not ideal as it disables hardware checksumming.
+
+This patch sets txpbl to 0x4 which is good for the most popular MTU
+value of 1500.
+
+diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+index cede1ad81..02674bbf0 100644
+--- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
++++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+@@ -288,6 +288,7 @@
+ 		resets = <&cru SRST_A_GMAC>;
+ 		reset-names = "stmmaceth";
+ 		rockchip,grf = <&grf>;
++		snps,txpbl = <0x4>;
+ 		status = "disabled";
+ 	};
+ 
diff --git a/patch/kernel/rockchip64-dev/rk3399-adjust-txpbl-for-mtu-1500.patch b/patch/kernel/rockchip64-dev/rk3399-adjust-txpbl-for-mtu-1500.patch
new file mode 100644
index 000000000000..226c90226eaf
--- /dev/null
+++ b/patch/kernel/rockchip64-dev/rk3399-adjust-txpbl-for-mtu-1500.patch
@@ -0,0 +1,19 @@
+Default Programmable Buffer Length for TX in rk3399's gmac is not suitable
+for MTUs higher than 1498. The easiest solution would be to disable
+TX offloading but it is not ideal as it disables hardware checksumming.
+
+This patch sets txpbl to 0x4 which is good for the most popular MTU
+value of 1500.
+
+diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+index cede1ad81..02674bbf0 100644
+--- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
++++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+@@ -288,6 +288,7 @@
+ 		resets = <&cru SRST_A_GMAC>;
+ 		reset-names = "stmmaceth";
+ 		rockchip,grf = <&grf>;
++		snps,txpbl = <0x4>;
+ 		status = "disabled";
+ 	};
+