From: Jakub Kicinski <kuba@kernel.org>
To: Jiri Pirko <jiri@resnulli.us>
Cc: Saeed Mahameed <saeed@kernel.org>,
Saeed Mahameed <saeedm@nvidia.com>,
"David S. Miller" <davem@davemloft.net>,
Paolo Abeni <pabeni@redhat.com>,
Eric Dumazet <edumazet@google.com>,
netdev@vger.kernel.org, Tariq Toukan <tariqt@nvidia.com>,
Shay Drory <shayd@nvidia.com>, Moshe Shemesh <moshe@nvidia.com>
Subject: Re: [net-next 14/15] net/mlx5: Light probe local SFs
Date: Tue, 27 Jun 2023 10:35:39 -0700 [thread overview]
Message-ID: <20230627103539.7968ce04@kernel.org> (raw)
In-Reply-To: <ZJsZetA02QMmR8By@nanopsycho>
On Tue, 27 Jun 2023 19:16:42 +0200 Jiri Pirko wrote:
> Hmm, how that could be generated by kernel if it should be really
> unique? Consider an example scenario where you have 2 DPUS (smartnic
> with CPUs) plugged into a single host.
>
> 1) On DPU 1 you do:
> $ sudo devlink port add pci/0000:08:00.0 flavour pcisf pfnum 1 sfnum 103
> pci/0000:08:00.0/32770: type eth netdev eth10 flavour pcisf controller 1 pfnum 0 sfnum 103 splittable false
> function:
> hw_addr 00:00:00:00:00:00 state inactive opstate detached uuid XXX
>
> 2) On DPU 2 you do:
> $ sudo devlink port add pci/0000:08:00.0 flavour pcisf pfnum 1 sfnum 103
> pci/0000:08:00.0/32770: type eth netdev eth10 flavour pcisf controller 1 pfnum 0 sfnum 103 splittable false
> function:
> hw_addr 00:00:00:00:00:00 state inactive opstate detached uuid XXX
>
> There is no way to sync between kernel running in the DPUs.
> Both SFs in this example would be externaly created on the host. The
> host will see 2 devices with the same uuid XXX, collision.
https://en.wikipedia.org/wiki/Universally_unique_identifier
tl;dr the whole point of UUIDs is that collisions do not happen
next prev parent reply other threads:[~2023-06-27 17:35 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-10 1:42 [pull request][net-next 00/15] mlx5 updates 2023-06-09 Saeed Mahameed
2023-06-10 1:42 ` [net-next 01/15] net/mlx5: Simplify unload all rep code Saeed Mahameed
2023-06-12 11:00 ` patchwork-bot+netdevbpf
2023-06-10 1:42 ` [net-next 02/15] net/mlx5: mlx5_ifc updates for embedded CPU SRIOV Saeed Mahameed
2023-06-10 1:42 ` [net-next 03/15] net/mlx5: Enable devlink port for embedded cpu VF vports Saeed Mahameed
2023-06-10 1:42 ` [net-next 04/15] net/mlx5: Update vport caps query/set for EC VFs Saeed Mahameed
2023-06-10 1:42 ` [net-next 05/15] net/mlx5: Add management of EC VF vports Saeed Mahameed
2023-06-10 1:42 ` [net-next 06/15] net/mlx5: Add/remove peer miss rules for EC VFs Saeed Mahameed
2023-06-10 1:42 ` [net-next 07/15] net/mlx5: Add new page type for EC VF pages Saeed Mahameed
2023-06-10 1:42 ` [net-next 08/15] net/mlx5: Use correct vport when restoring GUIDs Saeed Mahameed
2023-06-10 1:42 ` [net-next 09/15] net/mlx5: Query correct caps for min msix vectors Saeed Mahameed
2023-06-10 1:42 ` [net-next 10/15] net/mlx5: Update SRIOV enable/disable to handle EC/VFs Saeed Mahameed
2023-06-10 1:42 ` [net-next 11/15] net/mlx5: Set max number of embedded CPU VFs Saeed Mahameed
2023-06-10 1:42 ` [net-next 12/15] net/mlx5: Split function_setup() to enable and open functions Saeed Mahameed
2023-06-10 1:42 ` [net-next 13/15] net/mlx5: Move esw multiport devlink param to eswitch code Saeed Mahameed
2023-06-10 1:42 ` [net-next 14/15] net/mlx5: Light probe local SFs Saeed Mahameed
2023-06-10 7:01 ` Jakub Kicinski
2023-06-11 4:15 ` Saeed Mahameed
2023-06-11 5:10 ` Samudrala, Sridhar
2023-06-13 23:41 ` Saeed Mahameed
2023-06-12 17:51 ` Jakub Kicinski
2023-06-13 23:32 ` Saeed Mahameed
2023-06-14 2:05 ` Jakub Kicinski
2023-06-15 10:51 ` Jiri Pirko
2023-06-15 16:37 ` Jakub Kicinski
2023-06-15 17:37 ` Jiri Pirko
2023-06-15 19:33 ` Jakub Kicinski
2023-06-21 13:14 ` Jiri Pirko
2023-06-21 18:23 ` Jakub Kicinski
2023-06-22 6:42 ` Jiri Pirko
2023-06-22 6:38 ` Jiri Pirko
2023-06-22 16:35 ` Jakub Kicinski
2023-06-23 9:27 ` Jiri Pirko
2023-06-23 15:21 ` Jakub Kicinski
2023-06-24 9:33 ` Jiri Pirko
2023-06-24 20:47 ` Jakub Kicinski
2023-06-27 10:12 ` Jiri Pirko
2023-06-27 15:24 ` Jakub Kicinski
2023-06-27 17:16 ` Jiri Pirko
2023-06-27 17:35 ` Jakub Kicinski [this message]
2023-06-10 1:42 ` [net-next 15/15] net/mlx5e: Remove a useless function call Saeed Mahameed
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