linux-kernel - [PATCH] arm64: dts: renesas: r9a09g047: enable tx coe support

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Message-ID: <20250814153456.268208-1-john.madieu.xa@bp.renesas.com>
Date: Thu, 14 Aug 2025 17:34:55 +0200
From: John Madieu <john.madieu.xa@...renesas.com>
To: geert+renesas@...der.be,
	magnus.damm@...il.com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org
Cc: linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	biju.das.jz@...renesas.com,
	john.madieu@...il.com,
	John Madieu <john.madieu.xa@...renesas.com>
Subject: [PATCH] arm64: dts: renesas: r9a09g047: enable tx coe support

The GBETH IPs found on RZ/G3E SoC family are compatible with the stmmac driver.
They have a MAC HW feature register used by this driver to enable respective
features. While the register advertises Tx coe support, it was not enabled by
the driver due to the 'snps,force_thresh_dma_mode' dtsi property.

Switch from 'snps,force_thresh_dma_mode' to 'snps,force_sf_dma_mode' to enable
Tx checksum offload support on both GBETH IPs. While at it, also switch from
'snps,fixed-busrt' to 'nsps,mixed-burst' and remove 'snps,no-pbl-x8' for
optimal DMA configuration. This improvement results in a measurable TCP Tx
performance gains, increasing throughput by 20Mbps.

Signed-off-by: John Madieu <john.madieu.xa@...renesas.com>
---
 arch/arm64/boot/dts/renesas/r9a09g047.dtsi | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/boot/dts/renesas/r9a09g047.dtsi b/arch/arm64/boot/dts/renesas/r9a09g047.dtsi
index e4fac7e0d764..b55b113d1f11 100644
--- a/arch/arm64/boot/dts/renesas/r9a09g047.dtsi
+++ b/arch/arm64/boot/dts/renesas/r9a09g047.dtsi
@@ -722,9 +722,8 @@ eth0: ethernet@...30000 {
 			snps,perfect-filter-entries = <128>;
 			rx-fifo-depth = <8192>;
 			tx-fifo-depth = <8192>;
-			snps,fixed-burst;
-			snps,no-pbl-x8;
-			snps,force_thresh_dma_mode;
+			snps,mixed-burst;
+			snps,force_sf_dma_mode;
 			snps,axi-config = <&stmmac_axi_setup>;
 			snps,mtl-rx-config = <&mtl_rx_setup0>;
 			snps,mtl-tx-config = <&mtl_tx_setup0>;
@@ -823,9 +822,8 @@ eth1: ethernet@...40000 {
 			snps,perfect-filter-entries = <128>;
 			rx-fifo-depth = <8192>;
 			tx-fifo-depth = <8192>;
-			snps,fixed-burst;
-			snps,no-pbl-x8;
-			snps,force_thresh_dma_mode;
+			snps,mixed-burst;
+			snps,force_sf_dma_mode;
 			snps,axi-config = <&stmmac_axi_setup>;
 			snps,mtl-rx-config = <&mtl_rx_setup1>;
 			snps,mtl-tx-config = <&mtl_tx_setup1>;
-- 
2.25.1