Re: [PATCH v2 0/3] net/mlx5: net/mlx5: fix probing to allow BlueField Socket Direct

[Raslan Darawsheh <rasland@nvidia.com>]

Hi,

On 04/03/2026 12:57 PM, Dariusz Sosnowski wrote:
> Goal of this patchset is to fix probing logic in mlx5 networking PMD
> to allow support of BlueField DPUs with Socket Direct.
> In such use case, BlueField DPU will be connected through PCI
> to 2 different CPUs on the host.
> Each host CPU sees 2 PFs.
> Each PF is connected to one of the physical ports.
> 
>      +--------+               +--------+
>      |CPU 0   |               |CPU 1   |
>      |        |               |        |
>      |    pf0 |               |    pf0 |
>      |        |               |        |
>      |    pf1 |               |    pf1 |
>      |        |               |        |
>      +---+----+               +-+------+
>          |                      |
>          |                      |
>          |                      |
>          +----+           +-----+
>               |           |
>               |           |
>               |           |
>           +---+-----------+----+
>           |BF3 DPU             |
>           |                    |
>           | pf0hpf      pf1hpf |
>           |                    |
>           | pf2hpf      pf3hpf |
>           |                    |
>           |  p0          p1    |
>           +------+------+------+
>           | phy0 |      | phy1 |
>           +------+      +------+
> 
> On BlueField DPU ARM Linux netdevs map to PFs/ports as follows:
> 
> - p0 and p1 to physical ports 0 and 1 respectively,
> - pf0hpf and pf2hpf to CPU0 pf0 and CPU1 pf0 respectively,
> - pf1hpf and pf3hpf to CPU0 pf1 and CPU1 pf1 respectively.
> 
> There are several possible ways to use such a setup:
> 
> - Single E-Switch (embedded switch) per each CPU PF to
>    physical port connection.
> - Shared E-Switch for related CPU PFs:
>      - For example, both pf0hpf and pf2hpf are in the same E-Switch.
> - Multiport E-Switch.
> 
> Existing probing logic in mlx5 PMD did not support case (2).
> In this case there is one physical port (uplink in mlx5 naming)
> and 2 host PFs.
> On such a setup mlx5 generated port names with the following syntax:
> 
>      03:00.0_representor_vfX
> 
> Port name syntax was selected based on specific setup type.
> Since setup was not recognized as neither bond nor MPESW,
> mlx5 selected the default name without PF index.
> Since BlueField with Socket Direct would have 2 host PFs,
> such probing logic caused DPDK port name collisions
> on the attempt to probe 2 host PFs at the same time.
> 
> More over there were some false positives during probing on systems
> with or without specific udev rules which change mlx5 IB device
> name to include "bond" in the name.
> 
> This patchset addresses the above:
> 
> - Patch 1 and 2 - Fixes bond detection logic.
>    Previously mlx5 PMD relied on "bond" appearing in IB device name
>    which is not always the case. Moved to sysfs checks.
> - Patch 3 - Fixed uplink and host PF probing logic.
>    Previously mlx5 PMD relied on specific setup type.
>    With this patch probing is more generic and based on
>    types and number of available ports on the E-Switch.
> 
> With this patchset, a DPDK application run on BlueField ARM is able to
> probe all the relevant representors (corresponding to available netdevs).
> Using testpmd syntax users will be able to do the following:
> 
>      # Probe both physical ports
>      port attach 03:00.0,dv_flow_en=2,representor=pf0-1
> 
>      # Probe both host PF 0 from CPU 0
>      # (VF representor index -1 is special encoding for host PF)
>      port attach 03:00.0,dv_flow_en=2,representor=pf0vf65535
>      # or with explicit controller index
>      port attach 03:00.0,dv_flow_en=2,representor=c1pf0vf65535
> 
>      # Probe both host PF 0 from CPU 1
>      port attach 03:00.0,dv_flow_en=2,representor=pf2vf65535
>      # or with explicit controller index
>      port attach 03:00.0,dv_flow_en=2,representor=c2pf2vf65535
> 
> v1: https://patches.dpdk.org/project/dpdk/cover/20260302113443.16648-1-dsosnowski@nvidia.com/
> 
> v1->v2:
> - Squash patches 3-5 and add Fixes tag,
>    since these patches fix existing probing logic.
> 
> Dariusz Sosnowski (3):
>    common/mlx5: fix bond check
>    net/mlx5: fix bond check
>    net/mlx5: fix probing to allow BlueField Socket Direct
> 
>   drivers/common/mlx5/linux/mlx5_common_os.c |  86 ++++-
>   drivers/common/mlx5/linux/mlx5_common_os.h |   9 +
>   drivers/net/mlx5/linux/mlx5_os.c           | 356 ++++++++++++++-------
>   drivers/net/mlx5/mlx5.h                    |   2 +
>   4 files changed, 338 insertions(+), 115 deletions(-)
> 
> --
> 2.47.3
> 


Series applied to next-net-mlx,

Kindest regards
Raslan Darawsheh