netdev - Re: [RFC 02/10] IB/hfi-vnic: Virtual Network Interface Controller (VNIC) Bus driver

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Message-ID: <20161123005318.GA69897@knc-06.sc.intel.com>
Date:   Tue, 22 Nov 2016 16:53:18 -0800
From:   "Vishwanathapura, Niranjana" <niranjana.vishwanathapura@...el.com>
To:     Christoph Lameter <cl@...ux.com>
Cc:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org,
        Dennis Dalessandro <dennis.dalessandro@...el.com>
Subject: Re: [RFC 02/10] IB/hfi-vnic: Virtual Network Interface Controller
 (VNIC) Bus driver

On Tue, Nov 22, 2016 at 05:04:37PM -0600, Christoph Lameter wrote:
>On Tue, 22 Nov 2016, Vishwanathapura, Niranjana wrote:
>
>> Ok, I do understand Jason's point that we should probably not put this driver
>> under drivers/infiniband/sw/.., as this driver is not a HCA.
>> It is an ULP similar to ipoib, built on top of Omni-path irrespective of
>> whether we register a hfi_vnic_bus or a direct custom interface with HFI1.
>> This ULP will transmit and recieve Omni-path packets over the fabric, and is
>> dependent on IB MAD interface and the HFI1 driver.
>
>This is something that encapsulates IP (v4 right?) in something else.
>Would belong into
>
>	linux/net/ipv4
>
>You already have similar implementations there
>
>See f.e. ipip.c, ip_tunnel.c and lots more (try
>	ls linux/net/ipv4/*tunnel*
>
>)
>
>If this is more like a device then it would belong into
>
>linux/drivers/net/hfi or so (see also linux/drivers/net/ppp, plip,
>loopback, etc etc)
>

It is Ethernet packet encapsulated in Omni-path header by hfi_vnic driver.
The packets are sent and received over the wire by the HFI1 device driven by 
HFI1 driver. The encapsulation information is obtained via IB MAD control 
interface.

Niranjana

>
>