From 63016c3a91f2c458ca75869c8c782e899591f22d Mon Sep 17 00:00:00 2001 From: Ovidiu Panait Date: Wed, 22 Jul 2026 08:53:51 +0000 Subject: [PATCH] arm64: dts: renesas: r9a09g047: Switch GBETH TX queue scheduling to WRR The GBETH ethernet nodes don't specify a TX scheduling policy, so stmmac falls back to Strict Priority. In this configuration the queue with the highest priority gets all the traffic, starving the others under load. Under sustained UDP TX load with multiple data streams, this starvation triggers spurious adapter resets due to TX queue timeouts: iperf3 -c -i0 -t60 --bind-dev end0 -u -b0 -P4 end0: NETDEV WATCHDOG: CPU: 1: transmit queue 1 timed out 5228 ms end0: Reset adapter. Investigation shows that only the highest priority queue is advancing while the others stall for more than 5 seconds, causing a netdev watchdog reset. Switch the TX scheduling policy to Weighted-Round-Robin (WRR) so that traffic is processed across all queues, eliminating the stalls. Fixes: 41ffbb1c42d3 ("arm64: dts: renesas: r9a09g047: Add GBETH nodes") Signed-off-by: Ovidiu Panait Reviewed-by: Geert Uytterhoeven Tested-by: Tommaso Merciai Link: https://patch.msgid.link/20260722085353.136986-4-ovidiu.panait.rb@renesas.com Signed-off-by: Geert Uytterhoeven --- arch/arm64/boot/dts/renesas/r9a09g047.dtsi | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/arm64/boot/dts/renesas/r9a09g047.dtsi b/arch/arm64/boot/dts/renesas/r9a09g047.dtsi index 73757e8e2197..060405d4a2dd 100644 --- a/arch/arm64/boot/dts/renesas/r9a09g047.dtsi +++ b/arch/arm64/boot/dts/renesas/r9a09g047.dtsi @@ -1913,23 +1913,28 @@ queue3 { mtl_tx_setup0: tx-queues-config { snps,tx-queues-to-use = <4>; + snps,tx-sched-wrr; queue0 { + snps,weight = <0x10>; snps,dcb-algorithm; snps,priority = <0x1>; }; queue1 { + snps,weight = <0x12>; snps,dcb-algorithm; snps,priority = <0x2>; }; queue2 { + snps,weight = <0x14>; snps,dcb-algorithm; snps,priority = <0x4>; }; queue3 { + snps,weight = <0x18>; snps,dcb-algorithm; snps,priority = <0x8>; }; @@ -2013,23 +2018,28 @@ queue3 { mtl_tx_setup1: tx-queues-config { snps,tx-queues-to-use = <4>; + snps,tx-sched-wrr; queue0 { + snps,weight = <0x10>; snps,dcb-algorithm; snps,priority = <0x1>; }; queue1 { + snps,weight = <0x12>; snps,dcb-algorithm; snps,priority = <0x2>; }; queue2 { + snps,weight = <0x14>; snps,dcb-algorithm; snps,priority = <0x4>; }; queue3 { + snps,weight = <0x18>; snps,dcb-algorithm; snps,priority = <0x8>; };