netdev - Re: [PATCH net-next v13 11/12] virtio_net: Add support for TCP and UDP ethtool rules

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Message-ID: <aTCY8ZlV8Zw8_7FD@horms.kernel.org>
Date: Wed, 3 Dec 2025 20:09:21 +0000
From: Simon Horman <horms@...nel.org>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Daniel Jurgens <danielj@...dia.com>, netdev@...r.kernel.org,
	jasowang@...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, jgg@...pe.ca, kevin.tian@...el.com,
	kuba@...nel.org, andrew+netdev@...n.ch, edumazet@...gle.com,
	Chris Mason <clm@...a.com>
Subject: Re: [PATCH net-next v13 11/12] virtio_net: Add support for TCP and
 UDP ethtool rules

+ Chris

On Wed, Dec 03, 2025 at 08:33:53AM -0500, Michael S. Tsirkin wrote:
> On Tue, Dec 02, 2025 at 03:55:39PM +0000, Simon Horman wrote:
> > On Wed, Nov 26, 2025 at 01:35:38PM -0600, Daniel Jurgens wrote:
> > 
> > ...
> > 
> > > @@ -6005,6 +6085,11 @@ static void parse_ip4(struct iphdr *mask, struct iphdr *key,
> > >  		mask->tos = l3_mask->tos;
> > >  		key->tos = l3_val->tos;
> > >  	}
> > > +
> > > +	if (l3_mask->proto) {
> > > +		mask->protocol = l3_mask->proto;
> > > +		key->protocol = l3_val->proto;
> > > +	}
> > >  }
> > 
> > Hi Daniel,
> > 
> > Claude Code with review-prompts flags an issue here,
> > which I can't convince myself is not the case.
> > 
> > If parse_ip4() is called for a IP_USER_FLOW, which use ethtool_usrip4_spec,
> > as does this function, then all is well.
> > 
> > However, it seems that it may also be called for TCP_V4_FLOW and UDP_V4_FLOW
> > flows, in which case accessing .proto will overrun the mask and key which
> > are actually struct ethtool_tcpip4_spec.
> > 
> > https://netdev-ai.bots.linux.dev/ai-review.html?id=51d97b85-5ca3-4cb8-a96a-0d6eab5e7196#patch-10
> 
> 
> Oh I didn't know about this one. Is there any data on how does it work?
> Which model/prompt/etc?

Hi Michael,

I believe these prompts are used:

https://github.com/masoncl/review-prompts/

...