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

[Fil Dunsky]

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.

Thanks,
Fil