From: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
To: Thomas Monjalon <thomas@monjalon.net>,
Rongwei Liu <rongweil@nvidia.com>,
Jerin Jacob <jerinjacobk@gmail.com>
Cc: dev@dpdk.org, matan@nvidia.com, viacheslavo@nvidia.com,
orika@nvidia.com, stephen@networkplumber.org,
rasland@nvidia.com, Ferruh Yigit <ferruh.yigit@amd.com>,
bruce.richardson@intel.com
Subject: Re: [PATCH v4 2/3] ethdev: add standby state for live migration
Date: Wed, 1 Feb 2023 10:32:30 +0300 [thread overview]
Message-ID: <6b2c3d11-428a-2c69-ddf9-2b3306dacbce@oktetlabs.ru> (raw)
In-Reply-To: <45277384.fMDQidcC6G@thomas>
On 2/1/23 01:55, Thomas Monjalon wrote:
> 31/01/2023 19:14, Jerin Jacob:
>> On Wed, Jan 18, 2023 at 9:15 PM Rongwei Liu <rongweil@nvidia.com> wrote:
>>>
>>> When a DPDK application must be upgraded,
>>> the traffic downtime should be shortened as much as possible.
>>> During the migration time, the old application may stay alive
>>> while the new application is starting and being configured.
>>>
>>> In order to optimize the switch to the new application,
>>> the old application may need to be aware of the presence
>>> of the new application being prepared.
>>> This is achieved with a new API allowing the user to change the
>>> new application state to standby and active later.
>>>
>>> The added function is trying to apply the new state to all probed
>>> ethdev ports. To make this API simple and easy to use,
>>> the same flags have to be accepted by all devices.
>>>
>>> This is the scenario of operations in the old and new applications:
>>> . device: already configured by the old application
>>> . new: start as active
>>> . new: probe the same device
>>
>> How to probe same device if is already bind to another application?
>> vfio-pci wont allow this.
>
> I missed that part.
> There is no way to share a VFIO device between 2 applications?
As I understand multi-process shares an VFIO device between
many application. As far as I remember it is just required to
pass corresponding file descriptor to another application.
Anyway I fully agree that the patch requires more documentation
in doc/guides/ with the description of live migration theory of
operations.
>>> . new: set as standby
>>> . new: configure the device
>>> . device: has configurations from old and new applications
>>> . old: clear its device configuration
>>> . device: has only 1 configuration from new application
>>> . new: set as active
>>> . device: downtime for connecting all to the new application
>>> . old: shutdown
>
>
>
next prev parent reply other threads:[~2023-02-01 7:32 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-01 8:20 [RFC 0/2] add API to set process to primary or secondary Rongwei Liu
2022-12-01 8:20 ` [RFC 1/2] ethdev: add group description Rongwei Liu
2022-12-01 8:20 ` [RFC 2/2] ethdev: add API to set process to primary or secondary Rongwei Liu
2022-12-01 15:10 ` Stephen Hemminger
2022-12-02 3:27 ` Rongwei Liu
2022-12-05 16:08 ` Stephen Hemminger
2022-12-06 3:47 ` Rongwei Liu
2022-12-06 5:54 ` Stephen Hemminger
2022-12-21 9:00 ` [RFC v3 0/2] add API to set process to active or standby Rongwei Liu
2022-12-21 9:00 ` [RFC v3 1/2] ethdev: add group description Rongwei Liu
2023-01-18 15:44 ` [PATCH v4 0/3] add API for live migration Rongwei Liu
2023-01-18 15:44 ` [PATCH v4 1/3] ethdev: add flow rule group description Rongwei Liu
2023-01-31 11:53 ` Ori Kam
2023-02-06 12:15 ` Rongwei Liu
2023-02-07 2:57 ` [PATCH v5] " Rongwei Liu
2023-02-08 20:28 ` Ferruh Yigit
2023-02-09 2:06 ` Rongwei Liu
2023-02-09 7:32 ` [PATCH v6] " Rongwei Liu
2023-02-09 8:01 ` Ori Kam
2023-02-09 11:26 ` Ferruh Yigit
2023-01-18 15:44 ` [PATCH v4 2/3] ethdev: add standby state for live migration Rongwei Liu
2023-01-31 13:50 ` Ori Kam
2023-01-31 18:14 ` Jerin Jacob
2023-01-31 22:55 ` Thomas Monjalon
2023-02-01 7:32 ` Andrew Rybchenko [this message]
2023-02-01 8:31 ` Thomas Monjalon
2023-02-01 8:40 ` Jerin Jacob
2023-02-01 8:46 ` Thomas Monjalon
2023-02-02 10:23 ` Rongwei Liu
2023-02-01 7:52 ` Andrew Rybchenko
2023-02-01 8:27 ` Thomas Monjalon
2023-02-01 8:40 ` Andrew Rybchenko
2023-01-18 15:44 ` [PATCH v4 3/3] ethdev: add standby flags " Rongwei Liu
2023-01-23 13:20 ` Jerin Jacob
2023-01-30 2:47 ` Rongwei Liu
2023-01-30 17:10 ` Jerin Jacob
2023-01-31 2:53 ` Rongwei Liu
2023-01-31 8:45 ` Jerin Jacob
2023-01-31 9:01 ` Rongwei Liu
2023-01-31 14:37 ` Jerin Jacob
2023-01-31 14:45 ` Ori Kam
2023-01-31 17:50 ` Thomas Monjalon
2023-01-31 18:10 ` Jerin Jacob
2022-12-21 9:00 ` [RFC v3 2/2] ethdev: add API to set process to active or standby Rongwei Liu
2022-12-21 9:12 ` Jerin Jacob
2022-12-21 9:32 ` Rongwei Liu
2022-12-21 10:59 ` Jerin Jacob
2022-12-21 12:05 ` Rongwei Liu
2022-12-21 12:44 ` Jerin Jacob
2022-12-21 12:50 ` Rongwei Liu
2022-12-21 13:12 ` Jerin Jacob
2022-12-21 14:33 ` Rongwei Liu
2022-12-26 16:44 ` Ori Kam
2023-01-15 22:46 ` Thomas Monjalon
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