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Date: Tue, 15 Sep 2026 14:13:09 +0300
From: Leon Romanovsky <leon@kernel.org>
To: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Jakub Kicinski <kuba@kernel.org>, Tariq Toukan <tariqt@nvidia.com>,
	Andrew Lunn <andrew+netdev@lunn.ch>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>, netdev@vger.kernel.org,
	Paolo Abeni <pabeni@redhat.com>, Alex Vesker <valex@nvidia.com>,
	Gal Pressman <gal@nvidia.com>,
	Kalesh AP <kalesh-anakkur.purayil@broadcom.com>,
	Kees Cook <kees@kernel.org>, linux-kernel@vger.kernel.org,
	linux-rdma@vger.kernel.org, Mark Bloch <mbloch@nvidia.com>,
	Saeed Mahameed <saeedm@nvidia.com>,
	Yevgeny Kliteynik <kliteyn@nvidia.com>
Subject: Re: [PATCH net RESEND] net/mlx5: Use unique names for software
 steering caches
Message-ID: <20260915111309.GJ13683@unreal>
References: <20260730210200.2590115-1-tariqt@nvidia.com>
 <20260803182614.23f26c91@kernel.org>
 <20260804080455.GB326170@unreal>
 <20260804145756.331951b7@kernel.org>
 <20260806111739.GF23431@unreal>
 <28c6b0e5-eff3-4556-802d-be6ed3f16615@linux.ibm.com>
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In-Reply-To: <28c6b0e5-eff3-4556-802d-be6ed3f16615@linux.ibm.com>

On Mon, Sep 14, 2026 at 10:58:43AM +0200, Christian Borntraeger wrote:
> Am 06.08.26 um 13:17 schrieb Leon Romanovsky:
> > On Tue, Aug 04, 2026 at 02:57:56PM -0700, Jakub Kicinski wrote:
> > > On Tue, 4 Aug 2026 11:04:55 +0300 Leon Romanovsky wrote:
> > > > On Mon, Aug 03, 2026 at 06:26:14PM -0700, Jakub Kicinski wrote:
> > > > > On Fri, 31 Jul 2026 00:02:00 +0300 Tariq Toukan wrote:
> > > > > > Prefix each cache name with the device name to make it unique.
> > > > > 
> > > > > Why do we need a per-device kmem_cache?
> > > > > Isn't the right fix to make this driver-level state?
> > > > 
> > > > This kmem_cache is required only for software managed steering mode, which is
> > > > configured per device by mlx5_fs_mode_set(). In general, resources
> > > > should be allocated only when they are actually needed.
> > > 
> > > Of course you have to wrap the init in a lock and count users.
> > > Trivial stuff.
> > 
> > I don't see why we should abandon the simple, architecturally
> > correct approach of allocating and managing resources where they
> > belong in favor of a more complex global scheme involving locking
> > and reference counting.
> > 
> Any updates on this?

No, we are waiting for Jakub to explain why should we complicate simple
and working solution.

Thanks