linux-kernel - Re: [RFC net-next v1 0/3] Support mlx5 mediated devices in host

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Date:   Wed, 13 Mar 2019 15:08:04 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Parav Pandit <parav@...lanox.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        michal.lkml@...kovi.net, davem@...emloft.net,
        gregkh@...uxfoundation.org, jiri@...lanox.com,
        kwankhede@...dia.com, alex.williamson@...hat.com,
        vuhuong@...lanox.com, yuvalav@...lanox.com, kvm@...r.kernel.org
Subject: Re: [RFC net-next v1 0/3] Support mlx5 mediated devices in host

On Fri,  8 Mar 2019 16:07:53 -0600, Parav Pandit wrote:
> Use case:
> ---------
> A user wants to create/delete hardware linked sub devices without
> using SR-IOV.
> These devices for a pci device can be netdev (optional rdma device)
> or other devices. Such sub devices share some of the PCI device
> resources and also have their own dedicated resources.
> A user wants to use this device in a host where PF PCI device exist.
> (not in a guest VM.) A user may want to use such sub device in future
> in guest VM.
> 
> Few examples are:
> 1. netdev having its own txq(s), rq(s) and/or hw offload parameters.
> 2. netdev with switchdev mode using netdev representor

Hi Parav!

Sorry for going quiet, I'm hoping to clarify the use cases and
the devlink part on the other thread with Jiri, and then come back 
to implementation details.

> 3. rdma device with IB link layer and IPoIB netdev
> 4. rdma/RoCE device and a netdev
> 5. rdma device with multiple ports