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Date: Tue, 28 Apr 2026 18:46:31 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Marc Harvey <marcharvey@google.com>
Cc: Saeed Mahameed <saeedm@nvidia.com>, Leon Romanovsky <leon@kernel.org>,
 Tariq Toukan <tariqt@nvidia.com>, Mark Bloch <mbloch@nvidia.com>, Andrew
 Lunn <andrew+netdev@lunn.ch>, "David S. Miller" <davem@davemloft.net>, Eric
 Dumazet <edumazet@google.com>, Paolo Abeni <pabeni@redhat.com>,
 netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
 linux-kernel@vger.kernel.org, Kuniyuki Iwashima <kuniyu@google.com>
Subject: Re: [PATCH net-next] net/mlx5: Add MLX5_VXLAN config option
Message-ID: <20260428184631.40f1f1b7@kernel.org>
In-Reply-To: <20260428-mlx5_vxlan-v1-1-cf666d042618@google.com>
References: <20260428-mlx5_vxlan-v1-1-cf666d042618@google.com>
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On Tue, 28 Apr 2026 22:44:34 +0000 Marc Harvey wrote:
> Currently, there is no way to disable mlx5 vxlan offloading if vxlan
> is enabled. We've (possibly) seen some minor udp rr and udp stream
> regressions when enabling vxlan, and want a way to disable this
> offloading. Also coupling vxlan offloading with vxlan enablement
> generally limits the flexability of vxlan setups.
> 
> Add a new config option for mlx5 vxlan offloading specifically, so
> that users can use vxlan without automatically opting in to the
> offloading.
> 
> To keep the same behavior as before, the new config option is enabled
> by default if vxlan is enabled.

Can we delay init of whatever makes the device slow down until the
first vxlan port is registered? A kconfig level optimization of this
sort will have rather limited applicability.