From: Jiri Pirko <jiri@resnulli•us>
To: Parav Pandit <parav@nvidia•com>
Cc: Mark Bloch <mbloch@nvidia•com>, Jakub Kicinski <kuba@kernel•org>,
Eric Dumazet <edumazet@google•com>,
Paolo Abeni <pabeni@redhat•com>,
Andrew Lunn <andrew+netdev@lunn•ch>,
"David S. Miller" <davem@davemloft•net>,
Jonathan Corbet <corbet@lwn•net>,
Shuah Khan <skhan@linuxfoundation•org>,
Simon Horman <horms@kernel•org>,
Saeed Mahameed <saeedm@nvidia•com>,
Leon Romanovsky <leon@kernel•org>,
Tariq Toukan <tariqt@nvidia•com>,
Andrew Morton <akpm@linux-foundation•org>,
"Borislav Petkov (AMD)" <bp@alien8•de>,
Randy Dunlap <rdunlap@infradead•org>,
Dave Hansen <dave.hansen@linux•intel.com>,
Christian Brauner <brauner@kernel•org>,
Petr Mladek <pmladek@suse•com>,
"Peter Zijlstra (Intel)" <peterz@infradead•org>,
Thomas Gleixner <tglx@kernel•org>,
Pawan Gupta <pawan.kumar.gupta@linux•intel.com>,
Dapeng Mi <dapeng1.mi@linux•intel.com>,
Kees Cook <kees@kernel•org>, Marco Elver <elver@google•com>,
Eric Biggers <ebiggers@kernel•org>,
"NBU-Contact-Li Rongqing (EXTERNAL)" <lirongqing@baidu•com>,
"Paul E. McKenney" <paulmck@kernel•org>,
"linux-doc@vger•kernel.org" <linux-doc@vger•kernel.org>,
"linux-kernel@vger•kernel.org" <linux-kernel@vger•kernel.org>,
"netdev@vger•kernel.org" <netdev@vger•kernel.org>,
"linux-rdma@vger•kernel.org" <linux-rdma@vger•kernel.org>
Subject: Re: [RFC net-next 0/4] devlink: Add boot-time defaults
Date: Tue, 12 May 2026 20:35:09 +0200 [thread overview]
Message-ID: <agNy3RF9WCHBPev5@FV6GYCPJ69> (raw)
In-Reply-To: <SJ0PR12MB6806D8ADF943B30AD3B479CCDC392@SJ0PR12MB6806.namprd12.prod.outlook.com>
Tue, May 12, 2026 at 05:25:21PM CEST, parav@nvidia•com wrote:
>
>
>> From: Jiri Pirko <jiri@resnulli•us>
>> Sent: 12 May 2026 07:37 PM
>>
>> Tue, May 12, 2026 at 03:48:32PM CEST, parav@nvidia•com wrote:
>> >
>> >> From: Jiri Pirko <jiri@resnulli•us>
>> >> Sent: 12 May 2026 02:16 PM
>> >>
>> >> Mon, May 11, 2026 at 08:21:37PM +0200, parav@nvidia•com wrote:
>> >> >
>> >> >> From: Mark Bloch <mbloch@nvidia•com>
>> >> >> Sent: 10 May 2026 06:02 PM
>> >> >>
>> >> >
>> >> >[..]
>> >> >
>> >> >> > I look at it from the perspective that from some CX generation,
>> >> >> > switchdev mode should be default. So that is a device-based decision.
>> >> >> > I believe as such it can optionally be permanenty configured (nv config)
>> >> >> > on older device. Why not?
>> >> >>
>> >> >Because sometimes switchdev_inactive is needed and sometimes not.
>> >> >Such knob is not device decision.
>> >>
>> >> That is what I would call corner case. In that, user can use userspace
>> >> configuration to change the mode in runtime.
>> >>
>> >Corner vs common depends on users one talks to. :)
>> >If fw has switchdev(active) as default, and then
>> >And user needs to run switchdev_inactive, it will actually break their switching applications.
>>
>> Can you describe the actutal breakage please?
>>
>Driver default was switchdev so all the traffic is forwarded to the switch,
>and user didn't have chance to setup the fdb rules.
>So packets are dropped but user didn't expect the traffic to be forwarded.
User may switch mode to switchdev_inactive early on, before any of the
representors are created. What's the issue then?
>
>With this RFC, the device would start in the switchdev_inactive.
>And user's goal is achieved.
>
>> >
>> >So, one needs to invent switchdev_inactive in the FW.
>> >
>> >Jakub's suggestion in this RFC is covering both the scenarios uniformly without above problems.
>> >Single uapi for all the cases, so looks good to me.
>> >
>> >Moreover, do not understand how alternative solves such problems.
>> >i.e. user is unable to configure the fw because driver is not yet loaded/up.
>>
>> See my other reply in this thread. I don't think there is a need to
>> configure anything in FW. If we fix the behaviour in switchdev mode for
>> non-sriov user and change the default, no fw knob needed. What am I
>> missing?
>>
>If I understood your suggestion right, is it the devlinkd based solution?
The suggestion is to use "switchdev" as default with user configuration
no matter if it is devlinkd or something else.
>
>If yes, then Mark explained that it has the issue of all drivers to be loaded, followed by user space to start.
next prev parent reply other threads:[~2026-05-12 18:35 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-06 12:37 [RFC net-next 0/4] devlink: Add boot-time defaults Mark Bloch
2026-05-06 12:37 ` [RFC net-next 1/4] devlink: Add infrastructure for " Mark Bloch
2026-05-06 12:37 ` [RFC net-next 2/4] devlink: Add eswitch mode boot default Mark Bloch
2026-05-06 12:37 ` [RFC net-next 3/4] devlink: Add runtime parameter boot defaults Mark Bloch
2026-05-06 12:37 ` [RFC net-next 4/4] net/mlx5: Apply devlink boot defaults during init Mark Bloch
2026-05-06 15:22 ` [RFC net-next 0/4] devlink: Add boot-time defaults Jiri Pirko
2026-05-06 17:35 ` Mark Bloch
2026-05-07 11:03 ` Jiri Pirko
2026-05-08 17:59 ` Mark Bloch
2026-05-08 18:07 ` Jiri Pirko
2026-05-09 0:52 ` Jakub Kicinski
2026-05-09 7:01 ` Jiri Pirko
2026-05-10 12:31 ` Mark Bloch
2026-05-11 8:07 ` Jiri Pirko
2026-05-11 18:21 ` Parav Pandit
2026-05-12 8:45 ` Jiri Pirko
2026-05-12 13:48 ` Parav Pandit
2026-05-12 14:07 ` Jiri Pirko
2026-05-12 15:25 ` Parav Pandit
2026-05-12 18:35 ` Jiri Pirko [this message]
2026-05-13 5:53 ` Mark Bloch
2026-05-13 11:11 ` Jiri Pirko
2026-05-14 12:34 ` Mark Bloch
2026-05-10 16:37 ` Jakub Kicinski
2026-05-11 8:42 ` Jiri Pirko
2026-05-11 23:41 ` Jakub Kicinski
2026-05-12 8:42 ` Jiri Pirko
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