Re: aRFS support for stmmac , any existing work or interest?

On Mon, Aug 17, 2026 at 07:13:14PM -0700, Pedro de Oliveira Amarante wrote:

Hi,

Is there any existing work or interest in adding accelerated RFS to
the stmmac driver?

Today stmmac only reaches the Flexible Receive Parser (FRP) through
tc-flower/tc-u32, and that path is accept/drop only.

The hardware seems to supports it, as I've confirmed on a dwmac-4.20a
part (frpsel=1) that setting the FRP entry's dma_ch_no steers a
matched flow to the chosen channel; the driver just leaves it at 0.

- Is anyone already working on this, or has it been attempted before?
(I couldn't find prior postings , apologies if I missed a thread.)
- Would this be of interest / have a realistic path to merging upstream?

Happy to do the work and send an RFC if there's interest.

The architecture of the stmmac driver is not great. Please take a good
look at the driver before you start making changes, we don't want to
make it worse. It might be you need to perform some cleanup before you
can add new features etc.

However, RFCs are welcome.

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	Andrew