[ovs-dev] [PATCH v2] vswitchd: Always cleanup userspace datapath.

Ilya Maximets i.maximets at samsung.com
Tue Jul 2 09:32:31 UTC 2019

On 01.07.2019 19:52, Ben Pfaff wrote:
> On Thu, Jun 27, 2019 at 08:24:46PM +0300, Ilya Maximets wrote:
>> On 26.06.2019 21:27, Ben Pfaff wrote:
>>> On Tue, Jun 25, 2019 at 01:12:11PM +0300, Ilya Maximets wrote:
>>>> 'netdev' datapath is implemented within ovs-vswitchd process and can
>>>> not exist without it, so it should be gracefully terminated with a
>>>> full cleanup of resources upon ovs-vswitchd exit.
>>>> This change forces dpif cleanup for 'netdev' datapath regardless of
>>>> passing '--cleanup' to 'ovs-appctl exit'. Such solution allowes to
>>>> not pass this additional option everytime for userspace datapath
>>>> installations and also allowes to not terminate system datapath in
>>>> setups where both datapaths runs at the same time.
>>>> Exception made for 'internal' ports that could have user ip/route
>>>> configuration. These ports will not be removed without '--cleanup'.
>>>> This change fixes OVS disappearing from the DPDK point of view
>>>> (keeping HW NICs improperly configured, sudden closing of vhost-user
>>>> connections) and will help with linux devices clearing with upcoming
>>>> AF_XDP netdev support.
>>>> Signed-off-by: Ilya Maximets <i.maximets at samsung.com>
>>> I'm having trouble figuring out what the critical step is in the
>>> destruction process that this enables or disables.  It controls whether
>>> dpif_port_del() gets called.  There's a lot of stuff under
>>> dpif_port_del(), most of it indirect.  I'm not sure which bit is the
>>> important one.  Would you mind explaining what it is as part of the
>>> commit message?
>> """
>> The main part is that dpif_port_del() will lead to netdev_close()
>> and subsequent netdev_class->destroy(dev) which will stop HW NICs
>> and free their resources. For vhost-user interfaces it will invoke
>> vhost driver unregistering with a properly closed vhost-user
>> connection. For upcoming AF_XDP netdev this will allow to gracefully
>> destroy xdp sockets and unload xdp programs from linux interfaces.
>> Another important thing is that port deletion will also trigger
>> flushing of flows offloaded to HW NICs.
>> """
>> Does above shed some light on the main goals of this patch?
>> I could add this information to commit message while applying the
>> patch.
> Thanks.  It helps a lot.  Please add it to the commit message.
> Acked-by: Ben Pfaff <blp at ovn.org>

Thanks, Ben, Flavio and William!
I added above information to commit message and pushed the patch to master.

Best regards, Ilya Maximets.

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