[ovs-dev] [PATCH] vswitchd: Always cleanup userspace datapath.

[Flavio Leitner]

On Tue, Jun 25, 2019 at 03:59:57PM +0300, Ilya Maximets wrote:
> On 25.06.2019 15:41, Flavio Leitner wrote:
> > On Tue, Jun 25, 2019 at 03:37:09PM +0300, Ilya Maximets wrote:
> >> On 25.06.2019 15:20, Flavio Leitner wrote:
> >>> On Tue, Jun 25, 2019 at 01:07:53PM +0300, Ilya Maximets wrote:
> >>>> On 25.06.2019 0:15, Flavio Leitner wrote:
> >>>>> On Mon, Jun 24, 2019 at 06:28:37PM +0300, Ilya Maximets wrote:
> >>>> BTW, it's system dependent if ip/route information preserved on tap
> >>>> device detaching. I have a few systems, where 'ovs-appctl exit'
> >>>> leads to DOWN state for preserved internal ports and consequently
> >>>> loosing their IP addresses. On a few other systems this doesn't happen.
> >>>
> >>> I haven't seen any bug reports yet related to that. Do you happen to
> >>> know the kernel and OvS versions?
> >>
> >> I see this with OVS master and Linux 4.2.6:
> >>
> >> # ip addr add 192.168.114.20/24 dev ovsdpdk_br0
> >> # ip addr show dev ovsdpdk_br0
> >> 43: ovsdpdk_br0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 500
> >>     link/ether f2:20:dc:bf:7d:44 brd ff:ff:ff:ff:ff:ff
> >>     inet 192.168.114.20/24 scope global ovsdpdk_br0
> >>        valid_lft forever preferred_lft forever
> >>
> >> # ovs-appctl -t ovs-vswitchd exit
> >>
> >> # ip addr show dev ovsdpdk_br0
> >> 43: ovsdpdk_br0: <BROADCAST,MULTICAST,PROMISC> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 500
> >>     link/ether f2:20:dc:bf:7d:44 brd ff:ff:ff:ff:ff:ff
> >>
> >> The same scenario on RHEL7 keeps the interface in NO-CARRIER,UP state and
> >> preserved ip address.
> >>
> >> I don't think that it's OVS. It looks more like a kernel issue.
> > 
> > Sounds like that. 
> > If you start OvS again, does it bring the device UP?
> 
> Nope. It stays DOWN just like the newly created one.

Interesting, I will see if I can recreate the issue here as well.

fbl