linux-kernel - Re: [PATCH net-next 1/2] ethtool: rss: prevent rss ctx deletion when in use

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Message-ID: <966a82d9-c835-e87e-2c54-90a9a2552a21@gmail.com>
Date: Mon, 14 Oct 2024 11:10:33 +0100
From: Edward Cree <ecree.xilinx@...il.com>
To: Daniel Zahka <daniel.zahka@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] ethtool: rss: prevent rss ctx deletion when
 in use

On 11/10/2024 19:35, Daniel Zahka wrote:
> A list of active
> ntuple filters and their associated rss contexts can be compiled by
> querying a device's ethtool_ops.get_rxnfc. This patch checks to see if
> any ntuple filters are referencing an rss context during context
> deletion, and prevents the deletion if the requested context is still
> in use.

Imho it would make more sense to add core tracking of ntuple
 filters, along with a refcount on the rss context.  That way
 context deletion just has to check the count is zero.

-ed