netdev - Re: [PATCH rdma-next 0/8] User space steering

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Message-ID: <20190331140633.33df25a7@cakuba.hsd1.ca.comcast.net>
Date:   Sun, 31 Mar 2019 14:06:33 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Ariel Levkovich <lariel@...lanox.com>,
        Eli Cohen <eli@...lanox.com>, Mark Bloch <markb@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH rdma-next 0/8] User space steering

On Sun, 31 Mar 2019 19:44:42 +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...lanox.com>
> 
> From Ariel,
> 
> This series of patches adds user space managed steering infrastructure
> to the mlx5_ib driver.
> 
> User space managed steering requires the means to access a dedicated
> memory space that is used by the device to store the packet steering
> and header modification tables and rules in order to manage them directly
> without the device's firmware involvement. This dedicated memory is part
> of the ICM memory space.
> 
> The changes are introducing the mlx5_ib API to allocate, deallocate and
> register this dedicated SW ICM memory via the existing device memory API
> using a private attribute which specifies the memory type.
> 
> The allocated memory itself is not IO mapped and user can only access it
> using remote RDMA operations.
> 
> In addition, the series exposed the ICM address of the receive transport
> interface (TIR) of Raw Packet and RSS QPs to user since they are required
> to properly create and insert steering rules that direct flows to these QPs.

Hi Leon!  Out of curiosity what protocols are you guys steering here?
Is this some form of RoCE or IB?  Is there a good resource to read up on
the DEVX stuff? (I presume this series is related?)