netdev - Re: [PATCH rdma-next 5/5] RDMA/mlx5: Expose steering anchor to userspace

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Date:   Wed, 13 Jul 2022 15:31:33 -0700
From:   Saeed Mahameed <saeedm@...dia.com>
To:     Saeed Mahameed <saeed@...nel.org>
Cc:     Leon Romanovsky <leonro@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, Mark Bloch <mbloch@...dia.com>,
        Yishai Hadas <yishaih@...dia.com>
Subject: Re: [PATCH rdma-next 5/5] RDMA/mlx5: Expose steering anchor to
 userspace

On 03 Jul 13:54, Saeed Mahameed wrote:
>From: Mark Bloch <mbloch@...dia.com>
>
>Expose a steering anchor per priority to allow users to re-inject
>packets back into default NIC pipeline for additional processing.
>
>MLX5_IB_METHOD_STEERING_ANCHOR_CREATE returns a flow table ID which
>a user can use to re-inject packets at a specific priority.
>
>A FTE (flow table entry) can be created and the flow table ID
>used as a destination.
>
>When a packet is taken into a RDMA-controlled steering domain (like
>software steering) there may be a need to insert the packet back into
>the default NIC pipeline. This exposes a flow table ID to the user that can
>be used as a destination in a flow table entry.
>
>With this new method priorities that are exposed to users via
>MLX5_IB_METHOD_FLOW_MATCHER_CREATE can be reached from a non-zero UID.
>
>As user-created flow tables (via RDMA DEVX) are created with a non-zero UID
>thus it's impossible to point to a NIC core flow table (core driver flow tables
>are created with UID value of zero) from userspace.
>Create flow tables that are exposed to users with the shared UID, this
>allows users to point to default NIC flow tables.
>
>Steering loops are prevented at FW level as FW enforces that no flow
>table at level X can point to a table at level lower than X.
>
>Signed-off-by: Mark Bloch <mbloch@...dia.com>
>Reviewed-by: Yishai Hadas <yishaih@...dia.com>
>Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
>---
> drivers/infiniband/hw/mlx5/fs.c          | 138 ++++++++++++++++++++++-
> drivers/infiniband/hw/mlx5/mlx5_ib.h     |   6 +
> include/uapi/rdma/mlx5_user_ioctl_cmds.h |  17 +++

Jason, Can you ack/nack ? This has uapi.. 
I need to move forward with this submission.
Thanks