netdev - Re: [PATCH net-next] ethtool: Block setting of symmetric RSS when non-symmetric rx-flow-hash is requested

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Message-ID: <9af06d0b-8b3b-4353-8cc7-65ec50bf4edb@redhat.com>
Date: Tue, 18 Mar 2025 08:36:55 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Gal Pressman <gal@...dia.com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Andrew Lunn <andrew+netdev@...n.ch>, netdev@...r.kernel.org
Cc: Simon Horman <horms@...nel.org>, Andrew Lunn <andrew@...n.ch>,
 Tariq Toukan <tariqt@...dia.com>
Subject: Re: [PATCH net-next] ethtool: Block setting of symmetric RSS when
 non-symmetric rx-flow-hash is requested

On 3/18/25 8:28 AM, Gal Pressman wrote:
> On 17/03/2025 22:19, Paolo Abeni wrote:
>> I fear we can't replace macros with enum in uAPI: existing application
>> could do weird thing leveraging the macro defintion and would break with
>> this change.
> 
> I couldn't think of any issues, you got me curious, do you have an example?

I guess something alike the following could be quite common or at least
possible:

#ifdef AH_V4_FLOW

// kernel support AH flow, implement user-space side

#else

// fail on any AH-flow related code path

#endif

Cheers,

Paolo