netdev - Re: [PATCH V2 09/12] net/eipoib: Add main driver functionality

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Message-ID: <501C5328.4060301@mellanox.com>
Date:	Fri, 03 Aug 2012 15:39:36 -0700
From:	Ali Ayoub <ali@...lanox.com>
To:	David Miller <davem@...emloft.net>
CC:	ebiederm@...ssion.com, ogerlitz@...lanox.com, roland@...nel.org,
	netdev@...r.kernel.org, sean.hefty@...el.com, erezsh@...lanox.co.il
Subject: Re: [PATCH V2 09/12] net/eipoib: Add main driver functionality

On 8/3/2012 2:33 PM, David Miller wrote:
> From: Ali Ayoub <ali@...lanox.com>
> Date: Fri, 03 Aug 2012 13:31:35 -0700
> 
>> With eIPoIB architecture, the VM sees standard Ethernet emulator,
>> allowing the administrator to enslave eIPoIB PIF to the vSwitch/vBridge
>> as if it was standard Ethernet. Other approaches that exposes IB QP to
>> the VM (with w/o bypassing the kernel) won't be possible with the
>> current emulators and management tools.
> 
> So then fix the emulators and management tools to handle IB instead
> of adding this bogus new protocol?
> 
> This new protocol seems to exist only because you don't want to have
> to enhance the emulators and tools, and I'm sorry that isn't a valid
> reason to do something like this.

This driver exists to allow the user to have an Ethernet interface on
top of a high-speed InfiniBand (IB) interconnect.
Users would like to use sockets API from the VM without re-writing their
applications on top of IB verbs, this driver meant to allow such a user
to do so.

Exposing IB emulators and having IB support in the management tools for
the VM/Hypervisor won't address the usecases that this driver meant for.

With this driver, existing VMs, and their existing IP applications, can
run as-is on InfiniBand network.

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