Re: [PATCH net] net: sparx5/lan969x: fix DWRR cost max to match hardware register width

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@xxxxxxxxxx>:

On Tue, 10 Feb 2026 14:44:01 +0100 you wrote:
> DWRR (Deficit Weighted Round Robin) scheduling distributes bandwidth
> across traffic classes based on per-queue cost values, where lower cost
> means higher bandwidth share.
> 
> The SPX5_DWRR_COST_MAX constant is 63 (6 bits) but the hardware
> register field HSCH_DWRR_ENTRY_DWRR_COST is GENMASK(24, 20), only
> 5 bits wide (max 31). This causes sparx5_weight_to_hw_cost() to
> compute cost values that silently overflow via FIELD_PREP, resulting
> in incorrect scheduling weights.
> 
> [...]

Here is the summary with links:
  - [net] net: sparx5/lan969x: fix DWRR cost max to match hardware register width
    https://git.kernel.org/netdev/net/c/6c28aa8dfdf2

You are awesome, thank you!
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