From: Matan Azrad <matan@mellanox.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
"Gaëtan Rivet" <gaetan.rivet@6wind.com>
Cc: Thomas Monjalon <thomas@monjalon.net>,
"Wu, Jingjing" <jingjing.wu@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>,
Neil Horman <nhorman@tuxdriver.com>,
"Richardson, Bruce" <bruce.richardson@intel.com>
Subject: Re: [dpdk-dev] [PATCH v3 7/7] app/testpmd: adjust ethdev port ownership
Date: Mon, 22 Jan 2018 13:22:45 +0000 [thread overview]
Message-ID: <AM6PR0502MB3797FB780B588499A71189DCD2EC0@AM6PR0502MB3797.eurprd05.prod.outlook.com> (raw)
In-Reply-To: <2601191342CEEE43887BDE71AB97725886281B1D@irsmsx105.ger.corp.intel.com>
Hi
From: Ananyev, Konstantin [mailto:konstantin.ananyev@intel.com]
> Hi lads,
>
> >
> > Hi Matan,
> >
> > On Fri, Jan 19, 2018 at 01:35:10PM +0000, Matan Azrad wrote:
> > > Hi Konstantin
> > >
> > > From: Ananyev, Konstantin, Friday, January 19, 2018 3:09 PM
> > > > > -----Original Message-----
> > > > > From: Matan Azrad [mailto:matan@mellanox.com]
> > > > > Sent: Friday, January 19, 2018 12:52 PM
> > > > > To: Ananyev, Konstantin <konstantin.ananyev@intel.com>; Thomas
> > > > > Monjalon <thomas@monjalon.net>; Gaetan Rivet
> > > > <gaetan.rivet@6wind.com>;
> > > > > Wu, Jingjing <jingjing.wu@intel.com>
> > > > > Cc: dev@dpdk.org; Neil Horman <nhorman@tuxdriver.com>;
> > > > > Richardson, Bruce <bruce.richardson@intel.com>
> > > > > Subject: RE: [PATCH v3 7/7] app/testpmd: adjust ethdev port
> > > > > ownership
> > > > >
> > > > > Hi Konstantin
> > > > >
> > > > > From: Ananyev, Konstantin, Friday, January 19, 2018 2:38 PM
> > > > > > To: Matan Azrad <matan@mellanox.com>; Thomas Monjalon
> > > > > > <thomas@monjalon.net>; Gaetan Rivet
> <gaetan.rivet@6wind.com>;
> > > > Wu,
> > > > > > Jingjing <jingjing.wu@intel.com>
> > > > > > Cc: dev@dpdk.org; Neil Horman <nhorman@tuxdriver.com>;
> > > > > > Richardson, Bruce <bruce.richardson@intel.com>
> > > > > > Subject: RE: [PATCH v3 7/7] app/testpmd: adjust ethdev port
> > > > > > ownership
> > > > > >
> > > > > > Hi Matan,
> > > > > >
> > > > > > > -----Original Message-----
> > > > > > > From: Matan Azrad [mailto:matan@mellanox.com]
> > > > > > > Sent: Thursday, January 18, 2018 4:35 PM
> > > > > > > To: Thomas Monjalon <thomas@monjalon.net>; Gaetan Rivet
> > > > > > > <gaetan.rivet@6wind.com>; Wu, Jingjing
> > > > > > > <jingjing.wu@intel.com>
> > > > > > > Cc: dev@dpdk.org; Neil Horman <nhorman@tuxdriver.com>;
> > > > Richardson,
> > > > > > > Bruce <bruce.richardson@intel.com>; Ananyev, Konstantin
> > > > > > > <konstantin.ananyev@intel.com>
> > > > > > > Subject: [PATCH v3 7/7] app/testpmd: adjust ethdev port
> > > > > > > ownership
> > > > > > >
> > > > > > > Testpmd should not use ethdev ports which are managed by
> > > > > > > other DPDK entities.
> > > > > > >
> > > > > > > Set Testpmd ownership to each port which is not used by
> > > > > > > other entity and prevent any usage of ethdev ports which are
> > > > > > > not owned by
> > > > Testpmd.
> > > > > > >
> > > > > > > Signed-off-by: Matan Azrad <matan@mellanox.com>
> > > > > > > ---
> > > > > > > app/test-pmd/cmdline.c | 89 +++++++++++++++++++----------
> -------
> > > > ----
> > > > > > -----
> > > > > > > app/test-pmd/cmdline_flow.c | 2 +-
> > > > > > > app/test-pmd/config.c | 37 ++++++++++---------
> > > > > > > app/test-pmd/parameters.c | 4 +-
> > > > > > > app/test-pmd/testpmd.c | 63 ++++++++++++++++++++--------
> ----
> > > > > > > app/test-pmd/testpmd.h | 3 ++
> > > > > > > 6 files changed, 103 insertions(+), 95 deletions(-)
> > > > > > >
> > > > > > > diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
> > > > > > > index
> > > > > > > 31919ba..6199c64 100644
> > > > > > > --- a/app/test-pmd/cmdline.c
> > > > > > > +++ b/app/test-pmd/cmdline.c
> > > > > > > @@ -1394,7 +1394,7 @@ struct cmd_config_speed_all {
> > > > > > > &link_speed) < 0)
> > > > > > > return;
> > > > > > >
> > > > > > > - RTE_ETH_FOREACH_DEV(pid) {
> > > > > > > + RTE_ETH_FOREACH_DEV_OWNED_BY(pid, my_owner.id) {
> > > > > >
> > > > > > Why do we need all these changes?
> > > > > > As I understand you changed definition of
> > > > > > RTE_ETH_FOREACH_DEV(), so no testpmd should work ok default
> (no_owner case).
> > > > > > Am I missing something here?
> > > > >
> > > > > Now, After Gaetan suggestion RTE_ETH_FOREACH_DEV(pid) will
> > > > > iterate
> > > > over all valid and ownerless ports.
> > > >
> > > > Yes.
> > > >
> > > > > Here Testpmd wants to iterate over its owned ports.
> > > >
> > > > Why? Why it can't just iterate over all valid and ownerless ports?
> > > > As I understand it would be enough to fix current problems and
> > > > would allow us to avoid any changes in testmpd (which I think is a good
> thing).
> > >
> > > Yes, I understand that this big change is very daunted, But I think
> > > the current a lot of bugs in testpmd(regarding port ownership) even
> > > more
> > daunted.
> > >
> > > Look,
> > > Testpmd initiates some of its internal databases depends on specific
> > > port iteration, In some time someone may take ownership of Testpmd
> ports and testpmd will continue to touch them.
>
> But if someone will take the ownership (assign new owner_id) that port will
> not appear in RTE_ETH_FOREACH_DEV() any more.
>
Yes, but testpmd sometimes depends on previous iteration using internal database.
So it uses internal database that was updated by old iteration.
> > >
> >
> > If I look back on the fail-safe, its sole purpose is to have seamless
> > hotplug with existing applications.
> >
> > Port ownership is a genericization of some functions introduced by the
> > fail-safe, that could structure DPDK further. It should allow
> > applications to have a seamless integration with subsystems using port
> > ownership. Without this, port ownership cannot be used.
> >
> > Testpmd should be fixed, but follow the most common design patterns of
> > DPDK applications. Going with port ownership seems like a paradigm
> > shift.
> >
> > > In addition
> > > Using the old iterator in some places in testpmd will cause a race for run-
> time new ports(can be created by failsafe or any hotplug code):
> > > - testpmd finds an ownerless port(just now created) by the old
> > > iterator and start traffic there,
> > > - failsafe takes ownership of this new port and start traffic there.
> > > Problem!
>
> Could you shed a bit more light here - it would be race condition between
> whom and whom?
Sure.
> As I remember in testpmd all control ops are done within one thread (main
> lcore).
But other dpdk entity can use another thread, for example:
Failsafe uses the host thread(using alarm callback) to create a new port and to take ownership of a port.
The race:
Testpmd iterates over all ports by the master thread.
Failsafe takes ownership of a port by the host thread and start using it.
=> The two dpdk entities may use the device at same time!
Obeying the new ownership rules can prevent all these races.
> The only way to attach/detach port with it - invoke testpmd CLI
> "attach/detach" port.
>
> Konstantin
>
> >
> > Testpmd does not handle detection of new port. If it did, testing
> > fail-safe with it would be wrong.
> >
> > At startup, RTE_ETH_FOREACH_DEV already fixed the issue of registering
> > DEFERRED ports. There are still remaining issues regarding this, but I
> > think they should be fixed. The architecture does not need to be
> > completely moved to port ownership.
> >
> > If anything, this should serve as a test for your API with common
> > applications. I think you'd prefer to know and debug with testpmd
> > instead of firing up VPP or something like that to determine what went
> > wrong with using the fail-safe.
> >
> > >
> > > In addition
> > > As a good example for well-done application (free from ownership
> > > bugs) I tried here to adjust Tespmd to the new rules and BTW to fix
> > > a
> > lot of bugs.
> >
> > Testpmd has too much cruft, it won't ever be a good example of a
> > well-done application.
> >
> > If you want to demonstrate ownership, I think you should start an
> > example application demonstrating race conditions and their mitigation.
> >
> > I think that would be interesting for many DPDK users.
> >
> > >
> > >
> > > So actually applications which are not aware to the port ownership
> > > still are exposed to races, but if there use the old iterator(with
> > > the new
> > change) the amount of races decreases.
> > >
> > > Thanks, Matan.
> > > > Konstantin
> > > >
> > > > >
> > > > > I added to Testpmd ability to take an ownership of ports as the
> > > > > new ownership and synchronization rules suggested, Since Tespmd
> > > > > is a DPDK entity which wants that no one will touch its owned
> > > > > ports, It must allocate
> > > > an unique ID, set owner for its ports (see in main function) and
> > > > recognizes them by its owner ID.
> > > > >
> > > > > > Konstantin
> > > > > >
> >
> > Regards,
> > --
> > Gaëtan Rivet
> > 6WIND
next prev parent reply other threads:[~2018-01-22 13:22 UTC|newest]
Thread overview: 212+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-28 11:57 [dpdk-dev] [PATCH 0/5] ethdev: Port ownership Matan Azrad
2017-11-28 11:57 ` [dpdk-dev] [PATCH 1/5] ethdev: free a port by a dedicated API Matan Azrad
2017-11-28 11:57 ` [dpdk-dev] [PATCH 2/5] ethdev: add port ownership Matan Azrad
2017-11-30 12:36 ` Neil Horman
2017-11-30 13:24 ` Gaëtan Rivet
2017-11-30 14:30 ` Matan Azrad
2017-11-30 15:09 ` Gaëtan Rivet
2017-11-30 15:43 ` Matan Azrad
2017-12-01 12:09 ` Neil Horman
2017-12-03 8:04 ` Matan Azrad
2017-12-03 11:10 ` Ananyev, Konstantin
2017-12-03 13:46 ` Matan Azrad
2017-12-04 16:01 ` Neil Horman
2017-12-04 18:10 ` Matan Azrad
2017-12-04 22:30 ` Neil Horman
2017-12-05 6:08 ` Matan Azrad
2017-12-05 10:05 ` Bruce Richardson
2017-12-08 11:35 ` Thomas Monjalon
2017-12-08 12:31 ` Neil Horman
2017-12-21 17:06 ` Thomas Monjalon
2017-12-21 17:43 ` Neil Horman
2017-12-21 19:37 ` Matan Azrad
2017-12-21 20:14 ` Neil Horman
2017-12-21 21:57 ` Matan Azrad
2017-12-22 14:26 ` Neil Horman
2017-12-23 22:36 ` Matan Azrad
2017-12-29 16:56 ` Neil Horman
2017-12-05 19:26 ` Neil Horman
2017-12-08 11:06 ` Thomas Monjalon
2017-12-05 11:12 ` Ananyev, Konstantin
2017-12-05 11:44 ` Ananyev, Konstantin
2017-12-05 11:53 ` Thomas Monjalon
2017-12-05 14:56 ` Bruce Richardson
2017-12-05 14:57 ` Ananyev, Konstantin
2017-12-05 11:47 ` Thomas Monjalon
2017-12-05 15:13 ` Ananyev, Konstantin
2017-12-05 15:49 ` Thomas Monjalon
2017-11-28 11:57 ` [dpdk-dev] [PATCH 3/5] net/failsafe: free an eth port by a dedicated API Matan Azrad
2017-11-28 11:58 ` [dpdk-dev] [PATCH 4/5] net/failsafe: use ownership mechanism to own ports Matan Azrad
2017-11-28 11:58 ` [dpdk-dev] [PATCH 5/5] app/testpmd: adjust ethdev port ownership Matan Azrad
2018-01-07 9:45 ` [dpdk-dev] [PATCH v2 0/6] ethdev: " Matan Azrad
2018-01-07 9:45 ` [dpdk-dev] [PATCH v2 1/6] ethdev: fix port data reset timing Matan Azrad
2018-01-07 9:45 ` [dpdk-dev] [PATCH v2 2/6] ethdev: add port ownership Matan Azrad
2018-01-10 13:36 ` Ananyev, Konstantin
2018-01-10 16:58 ` Matan Azrad
2018-01-11 12:40 ` Ananyev, Konstantin
2018-01-11 14:51 ` Matan Azrad
2018-01-12 0:02 ` Ananyev, Konstantin
2018-01-12 7:24 ` Matan Azrad
2018-01-15 11:45 ` Ananyev, Konstantin
2018-01-15 13:09 ` Matan Azrad
2018-01-15 18:43 ` Ananyev, Konstantin
2018-01-16 8:04 ` Matan Azrad
2018-01-16 19:11 ` Ananyev, Konstantin
2018-01-16 20:32 ` Matan Azrad
2018-01-17 11:24 ` Ananyev, Konstantin
2018-01-17 12:05 ` Matan Azrad
2018-01-17 12:54 ` Ananyev, Konstantin
2018-01-17 13:10 ` Matan Azrad
2018-01-17 16:52 ` Ananyev, Konstantin
2018-01-17 18:02 ` Matan Azrad
2018-01-17 20:34 ` Matan Azrad
2018-01-18 14:17 ` Ananyev, Konstantin
2018-01-18 14:26 ` Matan Azrad
2018-01-18 14:41 ` Ananyev, Konstantin
2018-01-18 14:45 ` Matan Azrad
2018-01-18 14:51 ` Ananyev, Konstantin
2018-01-18 15:00 ` Matan Azrad
2018-01-17 14:00 ` Neil Horman
2018-01-17 17:01 ` Ananyev, Konstantin
2018-01-18 13:10 ` Neil Horman
2018-01-18 14:00 ` Matan Azrad
2018-01-18 16:54 ` Neil Horman
2018-01-18 17:20 ` Matan Azrad
2018-01-18 18:41 ` Neil Horman
2018-01-18 20:21 ` Matan Azrad
2018-01-19 1:41 ` Neil Horman
2018-01-19 7:14 ` Matan Azrad
2018-01-19 9:30 ` Bruce Richardson
2018-01-19 10:44 ` Matan Azrad
2018-01-19 13:30 ` Neil Horman
2018-01-19 13:57 ` Matan Azrad
2018-01-19 14:13 ` Thomas Monjalon
2018-01-19 15:27 ` Neil Horman
2018-01-19 17:17 ` Thomas Monjalon
2018-01-19 17:43 ` Neil Horman
2018-01-19 18:12 ` Thomas Monjalon
2018-01-19 19:47 ` Neil Horman
2018-01-19 20:19 ` Thomas Monjalon
2018-01-19 22:52 ` Neil Horman
2018-01-20 3:38 ` Tuxdriver
2018-01-20 12:54 ` Ananyev, Konstantin
2018-01-20 14:02 ` Thomas Monjalon
2018-01-19 12:55 ` Neil Horman
2018-01-19 13:52 ` Neil Horman
2018-01-18 16:27 ` Neil Horman
2018-01-17 17:58 ` Matan Azrad
2018-01-18 13:20 ` Neil Horman
2018-01-18 14:52 ` Matan Azrad
2018-01-19 13:57 ` Neil Horman
2018-01-19 14:07 ` Thomas Monjalon
2018-01-19 14:32 ` Neil Horman
2018-01-19 17:09 ` Thomas Monjalon
2018-01-19 17:37 ` Neil Horman
2018-01-19 18:10 ` Thomas Monjalon
2018-01-21 22:12 ` Ferruh Yigit
2018-01-07 9:45 ` [dpdk-dev] [PATCH v2 3/6] ethdev: synchronize port allocation Matan Azrad
2018-01-07 9:58 ` Matan Azrad
2018-01-07 9:45 ` [dpdk-dev] [PATCH v2 4/6] net/failsafe: free an eth port by a dedicated API Matan Azrad
2018-01-07 9:45 ` [dpdk-dev] [PATCH v2 5/6] net/failsafe: use ownership mechanism to own ports Matan Azrad
2018-01-08 10:32 ` Gaëtan Rivet
2018-01-08 11:16 ` Matan Azrad
2018-01-08 11:35 ` Gaëtan Rivet
2018-01-07 9:45 ` [dpdk-dev] [PATCH v2 6/6] app/testpmd: adjust ethdev port ownership Matan Azrad
2018-01-08 11:39 ` Gaëtan Rivet
2018-01-08 12:30 ` Matan Azrad
2018-01-08 13:30 ` Gaëtan Rivet
2018-01-08 13:55 ` Matan Azrad
2018-01-08 14:21 ` Gaëtan Rivet
2018-01-08 14:42 ` Matan Azrad
2018-01-16 5:53 ` Lu, Wenzhuo
2018-01-16 8:15 ` Matan Azrad
2018-01-17 0:46 ` Lu, Wenzhuo
2018-01-17 8:51 ` Matan Azrad
2018-01-18 0:53 ` Lu, Wenzhuo
2018-01-18 16:35 ` [dpdk-dev] [PATCH v3 0/7] Port ownership and syncronization Matan Azrad
2018-01-18 16:35 ` [dpdk-dev] [PATCH v3 1/7] ethdev: fix port data reset timing Matan Azrad
2018-01-18 17:00 ` Thomas Monjalon
2018-01-19 12:38 ` Ananyev, Konstantin
2018-03-05 11:24 ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2018-03-05 14:52 ` Matan Azrad
2018-03-05 15:06 ` Ferruh Yigit
2018-03-05 15:12 ` Matan Azrad
2018-03-27 22:37 ` Ferruh Yigit
2018-03-28 12:07 ` Matan Azrad
2018-03-30 10:39 ` Ferruh Yigit
2018-04-19 11:07 ` Ferruh Yigit
2018-04-25 12:16 ` Matan Azrad
2018-04-25 12:30 ` Ori Kam
2018-04-25 12:54 ` Ferruh Yigit
2018-04-25 14:01 ` Matan Azrad
2018-01-18 16:35 ` [dpdk-dev] [PATCH v3 2/7] ethdev: fix used portid allocation Matan Azrad
2018-01-18 17:00 ` Thomas Monjalon
2018-01-19 12:40 ` Ananyev, Konstantin
2018-01-20 16:48 ` Matan Azrad
2018-01-20 17:26 ` Ananyev, Konstantin
2018-01-18 16:35 ` [dpdk-dev] [PATCH v3 3/7] ethdev: add port ownership Matan Azrad
2018-01-18 21:11 ` Thomas Monjalon
2018-01-19 12:41 ` Ananyev, Konstantin
2018-01-18 16:35 ` [dpdk-dev] [PATCH v3 4/7] ethdev: synchronize port allocation Matan Azrad
2018-01-18 20:43 ` Thomas Monjalon
2018-01-18 20:52 ` Matan Azrad
2018-01-18 21:17 ` Thomas Monjalon
2018-01-19 12:47 ` Ananyev, Konstantin
2018-01-18 16:35 ` [dpdk-dev] [PATCH v3 5/7] net/failsafe: free an eth port by a dedicated API Matan Azrad
2018-01-18 16:35 ` [dpdk-dev] [PATCH v3 6/7] net/failsafe: use ownership mechanism to own ports Matan Azrad
2018-01-18 16:35 ` [dpdk-dev] [PATCH v3 7/7] app/testpmd: adjust ethdev port ownership Matan Azrad
2018-01-19 12:37 ` Ananyev, Konstantin
2018-01-19 12:51 ` Matan Azrad
2018-01-19 13:08 ` Ananyev, Konstantin
2018-01-19 13:35 ` Matan Azrad
2018-01-19 15:00 ` Gaëtan Rivet
2018-01-20 18:14 ` Matan Azrad
2018-01-22 10:17 ` Gaëtan Rivet
2018-01-22 11:22 ` Matan Azrad
2018-01-22 12:28 ` Ananyev, Konstantin
2018-01-22 13:22 ` Matan Azrad [this message]
2018-01-22 20:48 ` Ananyev, Konstantin
2018-01-23 8:54 ` Matan Azrad
2018-01-23 12:56 ` Gaëtan Rivet
2018-01-23 14:30 ` Matan Azrad
2018-01-25 9:36 ` Matan Azrad
2018-01-25 10:05 ` Thomas Monjalon
2018-01-25 11:15 ` Ananyev, Konstantin
2018-01-25 11:33 ` Thomas Monjalon
2018-01-25 11:55 ` Ananyev, Konstantin
2018-01-23 13:34 ` Ananyev, Konstantin
2018-01-23 14:18 ` Thomas Monjalon
2018-01-23 15:12 ` Ananyev, Konstantin
2018-01-23 15:18 ` Ananyev, Konstantin
2018-01-23 17:33 ` Thomas Monjalon
2018-01-23 21:18 ` Ananyev, Konstantin
2018-01-24 8:10 ` Thomas Monjalon
2018-01-24 18:30 ` Ananyev, Konstantin
2018-01-25 10:55 ` Thomas Monjalon
2018-01-25 11:09 ` Ananyev, Konstantin
2018-01-25 11:27 ` Thomas Monjalon
2018-01-23 14:43 ` Matan Azrad
2018-01-20 21:24 ` [dpdk-dev] [PATCH v4 0/7] Port ownership and syncronization Matan Azrad
2018-01-20 21:24 ` [dpdk-dev] [PATCH v4 1/7] ethdev: fix port data reset timing Matan Azrad
2018-01-20 21:24 ` [dpdk-dev] [PATCH v4 2/7] ethdev: fix used portid allocation Matan Azrad
2018-01-20 21:24 ` [dpdk-dev] [PATCH v4 3/7] ethdev: add port ownership Matan Azrad
2018-01-21 20:43 ` Ferruh Yigit
2018-01-21 20:46 ` Ferruh Yigit
2018-01-20 21:24 ` [dpdk-dev] [PATCH v4 4/7] ethdev: synchronize port allocation Matan Azrad
2018-01-20 21:24 ` [dpdk-dev] [PATCH v4 5/7] net/failsafe: free an eth port by a dedicated API Matan Azrad
2018-01-20 21:24 ` [dpdk-dev] [PATCH v4 6/7] net/failsafe: use ownership mechanism to own ports Matan Azrad
2018-01-20 21:24 ` [dpdk-dev] [PATCH v4 7/7] app/testpmd: adjust ethdev port ownership Matan Azrad
2018-01-22 16:38 ` [dpdk-dev] [PATCH v5 0/7] Port ownership and synchronization Matan Azrad
2018-01-22 16:38 ` [dpdk-dev] [PATCH v5 1/7] ethdev: fix port data reset timing Matan Azrad
2018-01-22 16:38 ` [dpdk-dev] [PATCH v5 2/7] ethdev: fix used portid allocation Matan Azrad
2018-01-22 16:38 ` [dpdk-dev] [PATCH v5 3/7] ethdev: add port ownership Matan Azrad
2018-01-22 16:38 ` [dpdk-dev] [PATCH v5 4/7] ethdev: synchronize port allocation Matan Azrad
2018-01-22 16:38 ` [dpdk-dev] [PATCH v5 5/7] net/failsafe: free an eth port by a dedicated API Matan Azrad
2018-01-22 16:38 ` [dpdk-dev] [PATCH v5 6/7] net/failsafe: use ownership mechanism to own ports Matan Azrad
2018-01-22 16:38 ` [dpdk-dev] [PATCH v5 7/7] app/testpmd: adjust ethdev port ownership Matan Azrad
2018-01-25 1:47 ` Lu, Wenzhuo
2018-01-25 8:30 ` Matan Azrad
2018-01-26 0:50 ` Lu, Wenzhuo
2018-01-29 11:21 ` [dpdk-dev] [PATCH v5 0/7] Port ownership and synchronization Matan Azrad
2018-01-31 19:53 ` Thomas Monjalon
2018-01-25 14:35 ` [dpdk-dev] [PATCH v3 0/7] Port ownership and syncronization Ferruh Yigit
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