On Mon, 24 Mar 2025 11:40:02 +0100 Maxime Chevallier wrote:

The patches 1 and 2 introduce the support for filtered DUMPs, where an
ifindex/ifname can be passed in the request header for the DUMP
operation. This is for when we want to dump everything a netdev
supports, but without doing so for every single netdev. ethtool's
"--show-phys ethX" option for example performs a filtered dump.

Patch 3 introduces 3 new ethnl ops : 
 ->dump_start() to initialize a dump context
 ->dump_one_dev(), that can be implemented per-command to dump  
 everything on a given netdev
 ->dump_done() to release the context  

Did you consider ignoring the RSS and focusing purely on PHYs?
The 3 callbacks are a bit generic, but we end up primarily
using them for PHY stuff. And the implementations still need 
to call ethnl_req_get_phydev() AFAICT