netdev - Re: [PATCH net-next v3 06/11] virtio_net: Implement layer 2 ethtool flow rules

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Message-ID: <20250926134824.6d0dc043@kernel.org>
Date: Fri, 26 Sep 2025 13:48:24 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Daniel Jurgens <danielj@...dia.com>
Cc: <netdev@...r.kernel.org>, <mst@...hat.com>, <jasowang@...hat.com>,
 <alex.williamson@...hat.com>, <pabeni@...hat.com>,
 <virtualization@...ts.linux.dev>, <parav@...dia.com>,
 <shshitrit@...dia.com>, <yohadt@...dia.com>, <xuanzhuo@...ux.alibaba.com>,
 <eperezma@...hat.com>, <shameerali.kolothum.thodi@...wei.com>,
 <jgg@...pe.ca>, <kevin.tian@...el.com>, <andrew+netdev@...n.ch>,
 <edumazet@...gle.com>
Subject: Re: [PATCH net-next v3 06/11] virtio_net: Implement layer 2 ethtool
 flow rules

On Tue, 23 Sep 2025 09:19:15 -0500 Daniel Jurgens wrote:
> Filtering a flow requires a classifier to match the packets, and a rule
> to filter on the matches.
> 
> A classifier consists of one or more selectors. There is one selector
> per header type. A selector must only use fields set in the selector
> capabality. If partial matching is supported, the classifier mask for a
> particular field can be a subset of the mask for that field in the
> capability.
> 
> The rule consists of a priority, an action and a key. The key is a byte
> array containing headers corresponding to the selectors in the
> classifier.
> 
> This patch implements ethtool rules for ethernet headers.

What does the spec say about ordering of the rules?
If the rules are not evaluated in an equivalent way to a linear
walk / match please support location == RX_CLS_LOC_ANY only