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

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Date:	Wed, 16 Mar 2011 09:17:25 +0000
From:	Ian Campbell <Ian.Campbell@...citrix.com>
To:	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"jeremy@...p.org" <jeremy@...p.org>,
	"herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"romieu@...zoreil.com" <romieu@...zoreil.com>,
	"bhutchings@...arflare.com" <bhutchings@...arflare.com>,
	"shemminger@...tta.com" <shemminger@...tta.com>,
	"mirqus@...il.com" <mirqus@...il.com>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>
Subject: Re: [PATCH v6] xen network backend driver

On Wed, 2011-03-16 at 02:38 +0000, David Miller wrote:
> 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.

Awesome, thanks!

For the ML archives: the history which led to this patch was
2e820f58f7ad..db3afbafeffd which I have pushed to:
        git://xenbits.xen.org/people/ianc/linux-2.6.git upstream/dom0/backend/netback-history
        
The base of the cleanup/upstreaming work (i.e. the commit which
corresponds to xen.git 072407c789a0) is
        git://xenbits.xen.org/people/ianc/linux-2.6.git upstream/dom0/backend/netback-history-base
        
Ian.

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