linux-kernel - RE: [PATCH 1/8] Drivers: hv: kvp: fix IP Failover

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Date:	Sun, 1 May 2016 00:21:37 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>
Subject: RE: [PATCH 1/8] Drivers: hv: kvp: fix IP Failover



> -----Original Message-----
> From: Greg KH [mailto:gregkh@...uxfoundation.org]
> Sent: Saturday, April 30, 2016 2:54 PM
> To: KY Srinivasan <kys@...rosoft.com>
> Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
> olaf@...fle.de; apw@...onical.com; vkuznets@...hat.com;
> jasowang@...hat.com
> Subject: Re: [PATCH 1/8] Drivers: hv: kvp: fix IP Failover
> 
> On Sat, Apr 30, 2016 at 09:43:09PM +0000, KY Srinivasan wrote:
> >
> >
> > > -----Original Message-----
> > > From: Greg KH [mailto:gregkh@...uxfoundation.org]
> > > Sent: Saturday, April 30, 2016 2:05 PM
> > > To: KY Srinivasan <kys@...rosoft.com>
> > > Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
> > > olaf@...fle.de; apw@...onical.com; vkuznets@...hat.com;
> > > jasowang@...hat.com
> > > Subject: Re: [PATCH 1/8] Drivers: hv: kvp: fix IP Failover
> > >
> > > On Tue, Apr 05, 2016 at 04:57:40PM -0700, K. Y. Srinivasan wrote:
> > > > From: Vitaly Kuznetsov <vkuznets@...hat.com>
> > > >
> > > > Hyper-V VMs can be replicated to another hosts and there is a feature
> to
> > > > set different IP for replicas, it is called 'Failover TCP/IP'. When
> > > > such guest starts Hyper-V host sends it KVP_OP_SET_IP_INFO message
> as
> > > soon
> > > > as we finish negotiation procedure. The problem is that it can happen
> (and
> > > > it actually happens) before userspace daemon connects and we reply
> with
> > > > HV_E_FAIL to the message. As there are no repetitions we fail to set
> the
> > > > requested IP.
> > > >
> > > > Solve the issue by postponing our reply to the negotiation message till
> > > > userspace daemon is connected. We can't wait too long as there is a
> > > > host-side timeout (cca. 75 seconds) and if we fail to reply in this time
> > > > frame the whole KVP service will become inactive. The solution is not
> > > > ideal - if it takes userspace daemon more than 60 seconds to connect
> > > > IP Failover will still fail but I don't see a solution with our current
> > > > separation between kernel and userspace parts.
> > > >
> > > > Other two modules (VSS and FCOPY) don't require such delay, leave
> them
> > > > untouched.
> > > >
> > > > Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> > > > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> > > > ---
> > > >  drivers/hv/hv_kvp.c       |   31 +++++++++++++++++++++++++++++++
> > > >  drivers/hv/hyperv_vmbus.h |    5 +++++
> > > >  2 files changed, 36 insertions(+), 0 deletions(-)
> > >
> > > This series doesn't apply to my tree :(
> >
> > Looks like you have already applied most of the patches in this series. I will
> resend what is not applied.
> 
> If this was a "resend", why didn't it show that in the patch
> description?

My fault; sorry for the confusion. Greg, I am going to resend all the 
patches yet to be committed with the right "resend" tag.

Regards,

K. Y