[PATCH net 0/2] net: stmmac: Track and report the TX DMA threshold per queue

[patchwork-bot+netdevbpf at kernel.org]

Hello:

This series was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba at kernel.org>:

On Tue, 13 Oct 2026 11:45:01 +0000 you wrote:
> On the Renesas RZ/V2H platform, which has two dwmac4 controllers, we
> observed sporadic iperf3 TCP TX failures on one of the controllers, with
> throughput dropping from >900Mbit/s to ~1Mbit/s due to TX underflows and
> the resulting retransmissions.
> 
> Commit 3a6c12a0c6c3 ("net: stmmac: bump tc when get underflow error from
> DMA descriptor") made dwmac4 raise the DMA threshold of the queues that
> report TX underflows, by increasing a global module parameter 'tc'.
> However, this logic does not work correctly across multiple queues and
> controllers, and can leave the TX DMA threshold stuck at 64 bytes.
> 
> [...]

Here is the summary with links:
  - [net,1/2] net: stmmac: Track the TX DMA threshold per queue
    https://git.kernel.org/netdev/net-next/c/9dd534187819
  - [net,2/2] net: stmmac: Report the TX DMA threshold per queue
    https://git.kernel.org/netdev/net-next/c/aee7b59e6e7b

You are awesome, thank you!
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