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From: Yuanhan Liu <yliu@fridaylinux.org>
To: "Tan, Jianfeng" <jianfeng.tan@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	"maxime.coquelin@redhat.com" <maxime.coquelin@redhat.com>,
	"mtetsuyah@gmail.com" <mtetsuyah@gmail.com>
Subject: Re: [dpdk-dev] [PATCH 10/12] vhost: support to kick in secondary process
Date: Wed, 27 Sep 2017 17:36:07 +0800	[thread overview]
Message-ID: <20170927093607.GJ2251@yliu-home> (raw)
In-Reply-To: <ED26CBA2FAD1BF48A8719AEF02201E36512EF4CE@SHSMSX103.ccr.corp.intel.com>

On Fri, Sep 22, 2017 at 02:30:21AM +0000, Tan, Jianfeng wrote:
> 
> 
> > -----Original Message-----
> > From: Yuanhan Liu [mailto:yliu@fridaylinux.org]
> > Sent: Thursday, September 21, 2017 5:18 PM
> > To: Tan, Jianfeng
> > Cc: dev@dpdk.org; maxime.coquelin@redhat.com; mtetsuyah@gmail.com
> > Subject: Re: [PATCH 10/12] vhost: support to kick in secondary process
> > 
> > On Thu, Sep 21, 2017 at 03:04:39PM +0800, Tan, Jianfeng wrote:
> > > >On Fri, Aug 25, 2017 at 09:40:50AM +0000, Jianfeng Tan wrote:
> > > >>To support kick in secondary process, we propose callfd_pri and
> > > >>kickfd_pri to store the value in primary process; and by a new
> > > >>API, rte_vhost_set_vring_effective_fd(), we can set effective
> > > >>callfd and kickfd which can be used by secondary process.
> > > >>
> > > >>Note in this case, either primary process or the secondary process
> > > >>can kick the frontend; that is, they cannot kick a vring at the
> > > >>same time.
> > > >Since only one can work, why not just overwriting the fd? Say, you
> > > >could introudce some APIs like "rte_vhost_set_vring_callfd", then
> > > >you don't need to introduce few more fields like "callfd_pri".
> > >
> > > That cannot address the below case:
> > > 1. Primary starts;
> > > 2. Secondary one starts; (if we overwrite it without storing it in some
> > > other fields)
> > > 3. Secondary one exits;
> > > 4. Secondary two starts. (primary cannot share the fd with this secondary
> > > process now, as this fd does not mean anything to the primary process)
> > 
> > I was thinking that those fds will be retrieved by the primary process
> > once? So thsoe it got at beginning are still valid?
> 
> Yes, the FDs are valid to primary process at step 1. But After overwriting in step 2, those FDs are not valid to primary.

Yes, but the primary process has already got its correct fds saved, right?
With the saved fds, it then could share it with another secondary process.

Actually, the key (and typical) issue of multi-process here is the fds are
process specific, while they are stored in the shared memory. That means
only one will take effect eventually. Worse, the old ones are lost.

So, I think to make it right in this case, you should move the fds from
the shared memory and store them in the memory of the corresponding process.
If that's done, all processes could have its own valid fds, then every
process could do the kick (if that's really necessary).

You could check following commit for more info.
553f45932fb7 ("net/virtio: store PCI operators pointer locally")

	--yliu

  reply	other threads:[~2017-09-27  9:36 UTC|newest]

Thread overview: 158+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-25  9:40 [dpdk-dev] [PATCH 00/12] support to run vdev in the " Jianfeng Tan
2017-08-25  9:40 ` [dpdk-dev] [PATCH 01/12] cryptodev: remove crypto vdev init Jianfeng Tan
2017-09-18 11:48   ` De Lara Guarch, Pablo
2017-08-25  9:40 ` [dpdk-dev] [PATCH 02/12] eal: avoid calling rte_vdev_init() Jianfeng Tan
2017-08-29 12:50   ` Gaëtan Rivet
2017-08-29 22:25     ` Tan, Jianfeng
2017-08-25  9:40 ` [dpdk-dev] [PATCH 03/12] crypto: move vdev helper functions into dedicated file Jianfeng Tan
2017-09-18 11:51   ` De Lara Guarch, Pablo
2017-08-25  9:40 ` [dpdk-dev] [PATCH 04/12] vdev: move to drivers/bus Jianfeng Tan
2017-08-29 13:04   ` Gaëtan Rivet
2017-08-29 22:47     ` Tan, Jianfeng
2017-09-18 11:47       ` De Lara Guarch, Pablo
2017-09-19  6:01         ` Tan, Jianfeng
2017-08-25  9:40 ` [dpdk-dev] [PATCH 05/12] bus/vdev: change log type from EAL to PMD Jianfeng Tan
2017-08-29 12:54   ` Gaëtan Rivet
2017-08-29 22:27     ` Tan, Jianfeng
2017-08-25  9:40 ` [dpdk-dev] [PATCH 06/12] eal: add channel for primary/secondary communication Jianfeng Tan
2017-09-18 13:49   ` Jiayu Hu
2017-09-21  6:11     ` Tan, Jianfeng
2017-09-20  3:00   ` Jiayu Hu
2017-09-21  6:53     ` Tan, Jianfeng
2017-09-27 12:19   ` Yuanhan Liu
2017-09-28 13:50     ` Tan, Jianfeng
2017-09-29  1:24       ` Yuanhan Liu
2017-09-29 10:09         ` Burakov, Anatoly
2017-09-29 10:25           ` Yuanhan Liu
2017-08-25  9:40 ` [dpdk-dev] [PATCH 07/12] bus/vdev: scan and probe vdev in secondary processes Jianfeng Tan
2017-08-25  9:40 ` [dpdk-dev] [PATCH 08/12] ethdev: support attach vdev in secondary process Jianfeng Tan
2017-08-25  9:40 ` [dpdk-dev] [PATCH 09/12] vhost: allocate virtio_net in memzone Jianfeng Tan
2017-08-25  9:40 ` [dpdk-dev] [PATCH 10/12] vhost: support to kick in secondary process Jianfeng Tan
2017-09-21  3:33   ` Yuanhan Liu
2017-09-21  7:04     ` Tan, Jianfeng
2017-09-21  9:17       ` Yuanhan Liu
2017-09-22  2:30         ` Tan, Jianfeng
2017-09-27  9:36           ` Yuanhan Liu [this message]
2017-09-28  5:10             ` Tan, Jianfeng
2017-09-28  8:09             ` Tan, Jianfeng
2017-09-30  8:18               ` Yuanhan Liu
2017-09-30 10:50                 ` Tan, Jianfeng
2017-08-25  9:40 ` [dpdk-dev] [PATCH 11/12] net/vhost: support to run in the " Jianfeng Tan
2017-09-21  4:29   ` Yuanhan Liu
2017-08-25  9:40 ` [dpdk-dev] [PATCH 12/12] examples/helloworld: do not exit automatically Jianfeng Tan
2017-09-18 11:44   ` De Lara Guarch, Pablo
2017-09-19  5:07     ` Tan, Jianfeng
2017-09-28 13:55 ` [dpdk-dev] [PATCH v2 00/12] support to run vdev in the secondary process Jianfeng Tan
2017-09-28 13:55   ` [dpdk-dev] [PATCH v2 01/12] cryptodev: remove crypto vdev init API Jianfeng Tan
2017-09-28 13:55   ` [dpdk-dev] [PATCH v2 02/12] eal: avoid calling rte_vdev_init() Jianfeng Tan
2017-09-28 13:55   ` [dpdk-dev] [PATCH v2 03/12] cryptodev: avoid dependency on rte_vdev.h Jianfeng Tan
2017-10-05 13:13     ` Jan Blunck
2017-10-09  1:04       ` Tan, Jianfeng
2017-09-28 13:55   ` [dpdk-dev] [PATCH v2 04/12] bus/fslmc: introduce RTE_LOGTYPE_BUS for bus drivers Jianfeng Tan
2017-09-28 13:55   ` [dpdk-dev] [PATCH v2 05/12] bus/vdev: move to vdev bus to drivers/bus Jianfeng Tan
2017-09-28 13:55   ` [dpdk-dev] [PATCH v2 06/12] bus/vdev: normalize log type Jianfeng Tan
2017-09-28 13:55   ` [dpdk-dev] [PATCH v2 07/12] eal: add channel for primary/secondary communication Jianfeng Tan
2017-09-28 15:01     ` Ananyev, Konstantin
2017-09-28 15:29       ` Burakov, Anatoly
2017-09-29  1:03         ` Tan, Jianfeng
2017-09-29 10:00           ` Burakov, Anatoly
2017-09-30  4:07             ` Tan, Jianfeng
2017-10-02 10:08               ` Burakov, Anatoly
2017-10-05 12:01     ` Jan Blunck
2017-10-09  1:27       ` Tan, Jianfeng
2017-09-28 13:55   ` [dpdk-dev] [PATCH v2 08/12] bus/vdev: scan and probe vdev in secondary processes Jianfeng Tan
2017-10-05 13:04     ` Jan Blunck
2017-10-09  1:08       ` Tan, Jianfeng
2017-09-28 13:55   ` [dpdk-dev] [PATCH v2 09/12] ethdev: support attach vdev in secondary process Jianfeng Tan
2017-10-05 14:26     ` Jan Blunck
2017-10-09  0:56       ` Tan, Jianfeng
2017-09-28 13:55   ` [dpdk-dev] [PATCH v2 10/12] vhost: allocate virtio_net in memzone Jianfeng Tan
2017-09-28 13:55   ` [dpdk-dev] [PATCH v2 11/12] vhost: support to kick in secondary process Jianfeng Tan
2017-09-28 13:55   ` [dpdk-dev] [PATCH v2 12/12] net/vhost: support to run in the " Jianfeng Tan
2017-09-29  8:28     ` Yuanhan Liu
2017-09-30  4:03       ` Tan, Jianfeng
2017-09-30  8:16         ` Yuanhan Liu
2017-09-30 10:06           ` Tan, Jianfeng
2017-09-30 11:49           ` Yuanhan Liu
2017-10-01 23:48             ` Tan, Jianfeng
2017-09-30  8:23     ` Yuanhan Liu
2017-09-30 10:53       ` Tan, Jianfeng
2017-09-30 11:34       ` Yuanhan Liu
2017-10-01 23:46         ` Tan, Jianfeng
2017-10-09  3:20 ` [dpdk-dev] [PATCH v3 0/5] move vdev into drivers/bus Jianfeng Tan
2017-10-09  3:20   ` [dpdk-dev] [PATCH v3 1/5] cryptodev: remove crypto vdev init API Jianfeng Tan
2017-10-09  3:20   ` [dpdk-dev] [PATCH v3 2/5] eal: avoid calling rte_vdev_init() Jianfeng Tan
2017-10-09  3:20   ` [dpdk-dev] [PATCH v3 3/5] bus: introduce RTE_LOGTYPE_BUS for bus drivers Jianfeng Tan
2017-10-09  3:20   ` [dpdk-dev] [PATCH v3 4/5] bus/vdev: move to vdev bus to drivers/bus Jianfeng Tan
2017-10-09  3:20   ` [dpdk-dev] [PATCH v3 5/5] bus/vdev: normalize log type Jianfeng Tan
2017-10-09 10:55   ` [dpdk-dev] [PATCH v4 0/5] move vdev into drivers/bus Jianfeng Tan
2017-10-09 10:55     ` [dpdk-dev] [PATCH v4 1/5] bus/vdev: scan and probe vdev in secondary processes Jianfeng Tan
2017-10-09 10:55     ` [dpdk-dev] [PATCH v4 2/5] ethdev: support attach vdev in secondary process Jianfeng Tan
2017-10-09 10:55     ` [dpdk-dev] [PATCH v4 3/5] vhost: allocate virtio_net in memzone Jianfeng Tan
2017-10-09 10:55     ` [dpdk-dev] [PATCH v4 4/5] vhost: support to kick in secondary process Jianfeng Tan
2017-10-09 10:55     ` [dpdk-dev] [PATCH v4 5/5] net/vhost: support to run in the " Jianfeng Tan
2017-10-09 11:08     ` [dpdk-dev] [PATCH v4 0/5] move vdev into drivers/bus Tan, Jianfeng
2017-10-09 11:27   ` [dpdk-dev] [PATCH v5 " Jianfeng Tan
2017-10-09 11:27     ` [dpdk-dev] [PATCH v5 1/5] cryptodev: remove crypto vdev init API Jianfeng Tan
2017-10-09 11:27     ` [dpdk-dev] [PATCH v5 2/5] eal: remove dependency on vdev Jianfeng Tan
2017-10-09 11:27     ` [dpdk-dev] [PATCH v5 3/5] bus: introduce new log type for bus drivers Jianfeng Tan
2017-10-11  6:54       ` Shreyansh Jain
2017-10-11 10:42         ` Tan, Jianfeng
2017-10-11 11:20           ` Shreyansh Jain
2017-10-12  2:14             ` Tan, Jianfeng
2017-10-09 11:27     ` [dpdk-dev] [PATCH v5 4/5] bus/vdev: move to vdev bus to drivers/bus Jianfeng Tan
2017-10-09 11:27     ` [dpdk-dev] [PATCH v5 5/5] bus/vdev: normalize log type Jianfeng Tan
2017-10-12  8:46   ` [dpdk-dev] [PATCH v6 0/4] move vdev into drivers/bus Jianfeng Tan
2017-10-12  8:46     ` [dpdk-dev] [PATCH v6 1/4] cryptodev: remove crypto vdev init API Jianfeng Tan
2017-10-12 10:06       ` Thomas Monjalon
2017-10-12  8:46     ` [dpdk-dev] [PATCH v6 2/4] eal: remove dependency on vdev Jianfeng Tan
2017-10-12  8:46     ` [dpdk-dev] [PATCH v6 3/4] bus/vdev: move to vdev bus to drivers/bus Jianfeng Tan
2017-10-12  8:46     ` [dpdk-dev] [PATCH v6 4/4] bus/vdev: change log type Jianfeng Tan
2017-10-13  2:04   ` [dpdk-dev] [PATCH v7 0/4] move vdev into drivers/bus Jianfeng Tan
2017-10-13  2:04     ` [dpdk-dev] [PATCH v7 1/4] ethdev: support attach vdev in secondary process Jianfeng Tan
2017-10-13  2:04     ` [dpdk-dev] [PATCH v7 2/4] vhost: allocate virtio_net in memzone Jianfeng Tan
2017-10-13  2:04     ` [dpdk-dev] [PATCH v7 3/4] vhost: support to kick in secondary process Jianfeng Tan
2017-10-13  2:04     ` [dpdk-dev] [PATCH v7 4/4] net/vhost: support to run in the " Jianfeng Tan
2017-10-13  8:26     ` [dpdk-dev] [PATCH v7 0/4] move vdev into drivers/bus Thomas Monjalon
2017-10-13 11:49       ` Tan, Jianfeng
2017-10-13 11:51   ` Jianfeng Tan
2017-10-13 11:51     ` [dpdk-dev] [PATCH v7 1/4] cryptodev: remove crypto vdev init API Jianfeng Tan
2017-10-23 10:06       ` De Lara Guarch, Pablo
2017-10-13 11:51     ` [dpdk-dev] [PATCH v7 2/4] eal: remove dependency on vdev Jianfeng Tan
2017-10-13 11:52     ` [dpdk-dev] [PATCH v7 3/4] bus/vdev: move to vdev bus to drivers/bus Jianfeng Tan
2017-10-23 14:34       ` De Lara Guarch, Pablo
2017-10-13 11:52     ` [dpdk-dev] [PATCH v7 4/4] bus/vdev: change log type Jianfeng Tan
2017-10-25 17:10   ` [dpdk-dev] [PATCH v8 0/4] move vdev into drivers/bus Jianfeng Tan
2017-10-25 17:10     ` [dpdk-dev] [PATCH v8 1/4] cryptodev: remove crypto vdev init API Jianfeng Tan
2017-10-25 17:10     ` [dpdk-dev] [PATCH v8 2/4] eal: remove dependency on vdev Jianfeng Tan
2017-10-25 17:10     ` [dpdk-dev] [PATCH v8 3/4] bus/vdev: move to vdev bus to drivers/bus Jianfeng Tan
2017-10-25 21:32       ` De Lara Guarch, Pablo
2017-10-25 23:03       ` Gaëtan Rivet
2017-10-25 17:10     ` [dpdk-dev] [PATCH v8 4/4] bus/vdev: change log type Jianfeng Tan
2017-10-27  1:06   ` [dpdk-dev] [PATCH v0 0/4] move vdev into drivers/bus Jianfeng Tan
2017-10-27  1:06     ` [dpdk-dev] [PATCH v9 1/4] cryptodev: remove crypto vdev init API Jianfeng Tan
2017-10-27  1:06     ` [dpdk-dev] [PATCH v9 2/4] eal: remove dependency on vdev Jianfeng Tan
2017-10-27  1:06     ` [dpdk-dev] [PATCH v9 3/4] bus/vdev: move to vdev bus to drivers/bus Jianfeng Tan
2017-10-27  7:56       ` Thomas Monjalon
2017-10-27  8:19         ` Tan, Jianfeng
2017-10-27  8:53           ` Thomas Monjalon
2017-10-27 16:57             ` Gaëtan Rivet
2017-10-27  1:06     ` [dpdk-dev] [PATCH v9 4/4] bus/vdev: change log type Jianfeng Tan
2017-10-27  3:23   ` [dpdk-dev] [PATCH v10 0/4] move vdev into drivers/bus Jianfeng Tan
2017-10-27  3:23     ` [dpdk-dev] [PATCH v10 1/4] cryptodev: remove crypto vdev init API Jianfeng Tan
2017-10-27  3:23     ` [dpdk-dev] [PATCH v10 2/4] eal: remove dependency on vdev Jianfeng Tan
2017-10-27  3:23     ` [dpdk-dev] [PATCH v10 3/4] bus/vdev: move to vdev bus to drivers/bus Jianfeng Tan
2017-10-27  3:23     ` [dpdk-dev] [PATCH v10 4/4] bus/vdev: change log type Jianfeng Tan
2017-10-30  8:28   ` [dpdk-dev] [PATCH v11 0/4] move vdev into drivers/bus Jianfeng Tan
2017-10-30  8:28     ` [dpdk-dev] [PATCH v11 1/4] cryptodev: remove crypto vdev init API Jianfeng Tan
2017-10-30  8:28     ` [dpdk-dev] [PATCH v11 2/4] eal: remove dependency on vdev Jianfeng Tan
2017-10-30  8:28     ` [dpdk-dev] [PATCH v11 3/4] bus/vdev: move to vdev bus to drivers/bus Jianfeng Tan
2017-11-07  2:43       ` Thomas Monjalon
2017-11-07  6:21         ` Tan, Jianfeng
2017-10-30  8:28     ` [dpdk-dev] [PATCH v11 4/4] bus/vdev: change log type Jianfeng Tan
2017-11-07  6:54   ` [dpdk-dev] [PATCH v12 0/4] move vdev into drivers/bus Jianfeng Tan
2017-11-07  6:54     ` [dpdk-dev] [PATCH v12 1/4] cryptodev: remove crypto vdev init API Jianfeng Tan
2017-11-07  6:54     ` [dpdk-dev] [PATCH v12 2/4] eal: remove dependency on vdev Jianfeng Tan
2017-11-07  6:54     ` [dpdk-dev] [PATCH v12 3/4] bus/vdev: move to vdev bus to drivers/bus Jianfeng Tan
2017-11-07  6:54     ` [dpdk-dev] [PATCH v12 4/4] bus/vdev: change log type Jianfeng Tan
2017-11-07 15:43     ` [dpdk-dev] [PATCH v12 0/4] move vdev into drivers/bus Thomas Monjalon

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