netdev - Re: [PATCH net-next] net: ethtool: Don't check if RSS context exists in case of context 0

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Message-ID: <8a53adaa-7870-46a9-9e67-b534a87a70ed@nvidia.com>
Date: Wed, 26 Feb 2025 08:08:40 +0200
From: Gal Pressman <gal@...dia.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, netdev@...r.kernel.org,
 Andrew Lunn <andrew@...n.ch>, Simon Horman <horms@...nel.org>,
 Joe Damato <jdamato@...tly.com>, Tariq Toukan <tariqt@...dia.com>
Subject: Re: [PATCH net-next] net: ethtool: Don't check if RSS context exists
 in case of context 0

On 26/02/2025 3:01, Jakub Kicinski wrote:
> On Tue, 25 Feb 2025 09:13:48 +0200 Gal Pressman wrote:
>> Context 0 (default context) always exists, there is no need to check
>> whether it exists or not when adding a flow steering rule.
>>
>> The existing check fails when creating a flow steering rule for context
>> 0 as it is not stored in the rss_ctx xarray.
> 
> But what is the use case for redirecting to context 0?

I can think of something like redirecting all TCP traffic to context 1,
and then a specific TCP 5-tuple to the default context.

Anyway, it used to work.