Messages in this thread | | | From | KY Srinivasan <> | Subject | RE: [PATCH 1/1] Drivers: hv: vmbus: Fix rescind handling issues | Date | Fri, 15 Sep 2017 18:01:05 +0000 |
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> -----Original Message----- > From: Vitaly Kuznetsov [mailto:vkuznets@redhat.com] > Sent: Friday, September 15, 2017 6:49 AM > To: KY Srinivasan <kys@microsoft.com> > Cc: Stephen Hemminger <stephen@networkplumber.org>; olaf@aepfle.de; > Stephen Hemminger <sthemmin@microsoft.com>; > gregkh@linuxfoundation.org; jasowang@redhat.com; linux- > kernel@vger.kernel.org; apw@canonical.com; marcelo.cerri@canonical.com; > devel@linuxdriverproject.org; leann.ogasawara@canonical.com; Haiyang > Zhang <haiyangz@microsoft.com> > Subject: Re: [PATCH 1/1] Drivers: hv: vmbus: Fix rescind handling issues > > Vitaly Kuznetsov <vkuznets@redhat.com> writes: > > > Stephen Hemminger <stephen@networkplumber.org> writes: > > > >> On Fri, 11 Aug 2017 10:03:59 -0700 > >> kys@exchange.microsoft.com wrote: > >> > >>> From: K. Y. Srinivasan <kys@microsoft.com> > >>> > >>> This patch handles the following issues that were observed when we are > >>> handling racing channel offer message and rescind message for the > same > >>> offer: > >>> > >>> 1. Since the host does not respond to messages on a rescinded channel, > >>> in the current code, we could be indefinitely blocked on the > vmbus_open() call. > >>> > >>> 2. When a rescinded channel is being closed, if there is a pending > interrupt on the > >>> channel, we could end up freeing the channel that the interrupt handler > would run on. > >>> > >>> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> > >>> Reviewed-by: Dexuan Cui <decui@microsoft.com> > >>> Tested-by: Dexuan Cui <decui@microsoft.com> > >> > >> This patch breaks re-initialization of the network device on MTU changes. > >> > >> Doing: > >> # ip li set dev eth1 mtu 9000 > >> > >> will hang in rndis_filter_add waiting for subchannel notification. > >> This is likely because when the vmbus device is reopened the sub > channels > >> are not correctly created. Not sure what is wrong with the patch, but my > >> suspicion is that the close/rescind events are no longer being sent to the > >> host. > > > > I'm seeing the same issue, reverting the offending > > > > commit 6f3d791f300618caf82a2be0c27456edd76d5164 > > Author: K. Y. Srinivasan <kys@microsoft.com> > > Date: Fri Aug 11 10:03:59 2017 -0700 > > > > Drivers: hv: vmbus: Fix rescind handling issues > > > > which made it upstream helps. Did you guys do some investigation here? > > In case not I can take a look next week. > > Sorry, I have to resend - K.Y.'s kys@exchange.microsoft.com doesn't > accept mail from me :-(
I think this turned out to be a bug in netvsc - Stephen can elaborate. I think the fix has been submitted upstream as well.
K. Y > > -- > Vitaly
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