Re: [PATCH RFC 00/10] ARM: Add support for Cortina Systems CS75xx and Securifi Almond+

[Linus Walleij]

On Wed, Sep 30, 2026 at 12:57 PM Fil Dunsky <filipp.dunsky@xxxxxxxxx> wrote:
> On Wed, Sep 30, 2026 at 12:39 PM Linus Walleij <linusw@xxxxxxxxxx> wrote:

> > Is this OpenWrt fork public?
>
> Yes, it is under review in OpenWrt:
> https://github.com/openwrt/openwrt/pull/25033
> The sources are in target/linux/cortina/files/, the Ethernet part in
> drivers/net/ethernet/cortina/cs752x_ne.c (plus cs752x_fe.c,
> cs752x_sch_tm.c and drivers/net/mdio/mdio-cs75xx.c).
>
> > Actually what I'm most curious about is the packet engine, which may or
> > may not be related to drivers/net/ethernet/cortina/*
>
> As far as I can tell it is not derived from the Gemini GMAC/TOE: the
> vendor driver has no StorLink or Gemini references, and the engine is
> split into a network interface (NI) with per-port MACs, a DMA/LSO
> block, a queue manager with its buffers in the top 64 MiB of DRAM, a
> traffic manager/scheduler and a forwarding engine with packet buffers
> in on-chip XRAM, which does not map onto the gemini.c register layout.
> I have not compared the descriptor formats in detail though. The
> OpenWrt driver only uses the NI/DMA path, all forwarding in software.

OK once this is merged post the network engine under
drivers/net/ethernet/cortina/* and I will help out to review it and
get it merged.

I agree it's a good idea to merge this upstream first to offburden
OpenWrt, that was the approach taken for Gemini and IXP4xx
and those are extremely lightweight for OpenWrt to maintain
since then.

Yours,
Linus Walleij