netdev - Re: [PATCH v6] xen network backend driver

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Message-Id: <20110315.193855.104049587.davem@davemloft.net>
Date:	Tue, 15 Mar 2011 19:38:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Ian.Campbell@...rix.com
Cc:	netdev@...r.kernel.org, xen-devel@...ts.xensource.com,
	jeremy@...p.org, herbert@...dor.apana.org.au,
	konrad.wilk@...cle.com, romieu@...zoreil.com,
	bhutchings@...arflare.com, shemminger@...tta.com, mirqus@...il.com,
	eric.dumazet@...il.com
Subject: Re: [PATCH v6] xen network backend driver

From: Ian Campbell <Ian.Campbell@...rix.com>
Date: Tue, 15 Mar 2011 10:06:18 +0000

> netback is the host side counterpart to the frontend driver in
> drivers/net/xen-netfront.c. The PV protocol is also implemented by
> frontend drivers in other OSes too, such as the BSDs and even Windows.
> 
> The patch is based on the driver from the xen.git pvops kernel tree but
> has been put through the checkpatch.pl wringer plus several manual
> cleanup passes and review iterations. The driver has been moved from
> drivers/xen/netback to drivers/net/xen-netback.
> 
> One major change from xen.git is that the guest transmit path (i.e. what
> looks like receive to netback) has been significantly reworked to remove
> the dependency on the out of tree PageForeign page flag (a core kernel
> patch which enables a per page destructor callback on the final
> put_page). This page flag was used in order to implement a grant map
> based transmit path (where guest pages are mapped directly into SKB
> frags). Instead this version of netback uses grant copy operations into
> regular memory belonging to the backend domain. Reinstating the grant
> map functionality is something which I would like to revisit in the
> future.
> 
> Note that this driver depends on 2e820f58f7ad "xen/irq: implement
> bind_interdomain_evtchn_to_irqhandler for backend drivers" which is in
> linux next via the "xen-two" tree and is intended for the 2.6.39 merge
> window:
>         git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/backends
> this branch has only that single commit since 2.6.38-rc2 and is safe for
> cross merging into the net branch.
> 
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> Reviewed-by: Ben Hutchings <bhutchings@...arflare.com>

Ok, I merged that xen commit into my tree and then added this
driver.

Thanks.
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