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From: Thomas Monjalon <thomas@monjalon.net>
To: Bruce Richardson <bruce.richardson@intel.com>,
	Jan Blunck <jblunck@infradead.org>
Cc: "Gaëtan Rivet" <gaetan.rivet@6wind.com>,
	dev@dpdk.org, "Shreyansh Jain" <shreyansh.jain@nxp.com>
Subject: Re: [dpdk-dev] [PATCH v7 13/15] eal: add hotplug add/remove functions
Date: Fri, 30 Jun 2017 18:29:01 +0200	[thread overview]
Message-ID: <2133726.lcE2RmnHbq@xps> (raw)
In-Reply-To: <20170630162544.GB17400@bricha3-MOBL3.ger.corp.intel.com>

30/06/2017 18:25, Bruce Richardson:
> On Fri, Jun 30, 2017 at 06:13:51PM +0200, Gaëtan Rivet wrote:
> > On Fri, Jun 30, 2017 at 06:03:17PM +0200, Thomas Monjalon wrote:
> > > 30/06/2017 17:44, Jan Blunck:
> > > > On Fri, Jun 30, 2017 at 11:20 AM, Bruce Richardson
> > > > <bruce.richardson@intel.com> wrote:
> > > > > On Fri, Jun 30, 2017 at 11:11:42AM +0200, Gaėtan Rivet wrote:
> > > > >> On Fri, Jun 30, 2017 at 11:06:03AM +0200, Thomas Monjalon wrote:
> > > > >> > 29/06/2017 20:22, Jan Blunck:
> > > > >> > >  /**
> > > > >> > > + * Hotplug add a given device to a specific bus.
> > > > >> > > + *
> > > > >> > > + * @param busname
> > > > >> > > + *   The bus name the device is added to.
> > > > >> > > + * @param devname
> > > > >> > > + *   The device name. Based on this device name, eal will identify a driver
> > > > >> > > + *   capable of handling it and pass it to the driver probing function.
> > > > >> > > + * @param devargs
> > > > >> > > + *   Device arguments to be passed to the driver.
> > > > >> > > + * @return
> > > > >> > > + *   0 on success, negative on error.
> > > > >> > > + */
> > > > >> > > +int rte_eal_hotplug_add(const char *busname, const char *devname,
> > > > >> > > +                 const char *devargs);
> > > > >> >
> > > > >> > After the hotplug, we may need to get the rte_device.
> > > > >> > Should we add a struct **rte_device as parameter,
> > > > >> > or should we add a helper function to get the rte_device
> > > > >> > from busname and devname?
> > > > >>
> > > > >> Also possible: return a struct *rte_device and set rte_errno on error.
> > > > >>
> > > > > +1 for this option.
> > > > 
> > > > Given that the caller of this is usually something that injects events
> > > > from the system I wonder what it is going to do with a rte_device
> > > > reference. Additionally to what the caller knows anyway (name,
> > > > numa_node, devargs) it can check if a driver got assigned. Sure the
> > > > caller could upcast conditionally based on the busname ...
> > > > 
> > > > At this point I guess the control plane would anyway want to get
> > > > access to a high-level object, e.g. the rte_ethdev. I believe it is
> > > > better to decouple this through callbacks that can get registered with
> > > > individual buses.
> > > 
> > > I think Gaetan has an example of use of rte_device after plugging
> > > with the failsafe PMD (managing slaves).
> > > Anyway, it can be discussed later with a real example of use if needed.
> > > We have a couple of weeks before freezing the API.
> > 
> > The rte_device should be accessible from the rte_eth_dev anyway so it
> > does not make much difference. As long as a handle on the device is
> > available. It is of course possible to add yet another callback to
> > search the device just plugged, but I don't see a reason here not to do
> > it in one pass.
> > 
> At this point in the process we just need to get in what we can.
> 
> Given there is so much discussion I would suggest we apply what we have
> now, but mark the new APIs as "experimental" at this point. That should
> allow us to test them, and build upon them without holding us back if we
> do need to change them in the next release. Once everyone is happy with
> the final result, we can lock them down then. It seems premature
> to do so now, with the current discussion, but on the other hand
> it seems foolish to not put what work has been done thus far
> into a release as a starting point.

I agree.
Please Jan, add EXPERIMENTAL in the doxygen of the new hotplug API
for your next version. Thanks

  reply	other threads:[~2017-06-30 16:29 UTC|newest]

Thread overview: 117+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-26  0:21 [dpdk-dev] [PATCH v5 00/12] bus: attach / detach API Gaetan Rivet
2017-06-26  0:21 ` [dpdk-dev] [PATCH v5 01/12] bus: add bus iterator to find a bus Gaetan Rivet
2017-06-26 15:30   ` Bruce Richardson
2017-06-26 20:53     ` Gaëtan Rivet
2017-06-26  0:22 ` [dpdk-dev] [PATCH v5 02/12] bus: add device iterator method Gaetan Rivet
2017-06-26 16:20   ` Bruce Richardson
2017-06-26 21:13     ` Gaëtan Rivet
2017-06-26  0:22 ` [dpdk-dev] [PATCH v5 03/12] bus: add helper to find which bus holds a device Gaetan Rivet
2017-06-26 16:31   ` Bruce Richardson
2017-06-26 22:16     ` Gaëtan Rivet
2017-06-26  0:22 ` [dpdk-dev] [PATCH v5 04/12] bus: add bus iterator to find " Gaetan Rivet
2017-06-27 10:14   ` Bruce Richardson
2017-06-27 13:54   ` Bruce Richardson
2017-06-27 15:05     ` Gaëtan Rivet
2017-06-27 15:08       ` Bruce Richardson
2017-06-26  0:22 ` [dpdk-dev] [PATCH v5 05/12] bus: introduce hotplug functionality Gaetan Rivet
2017-06-27 12:23   ` Bruce Richardson
2017-06-26  0:22 ` [dpdk-dev] [PATCH v5 06/12] vdev: implement find_device bus operation Gaetan Rivet
2017-06-27 12:25   ` Bruce Richardson
2017-06-26  0:22 ` [dpdk-dev] [PATCH v5 07/12] vdev: implement hotplug functionality Gaetan Rivet
2017-06-27 12:41   ` Bruce Richardson
2017-06-26  0:22 ` [dpdk-dev] [PATCH v5 08/12] vdev: expose bus name Gaetan Rivet
2017-06-27 12:45   ` Bruce Richardson
2017-06-26  0:22 ` [dpdk-dev] [PATCH v5 09/12] vdev: use standard bus registration function Gaetan Rivet
2017-06-27 12:59   ` Bruce Richardson
2017-06-26  0:22 ` [dpdk-dev] [PATCH v5 10/12] pci: implement find_device bus operation Gaetan Rivet
2017-06-27 13:36   ` Bruce Richardson
2017-06-26  0:22 ` [dpdk-dev] [PATCH v5 11/12] pci: implement hotplug " Gaetan Rivet
2017-06-27 13:49   ` Bruce Richardson
2017-06-26  0:22 ` [dpdk-dev] [PATCH v5 12/12] eal: make virtual driver probe and remove take rte_vdev_device Gaetan Rivet
2017-06-27 13:58   ` Bruce Richardson
2017-06-27 14:47     ` Gaëtan Rivet
2017-06-27 15:06       ` Bruce Richardson
2017-06-27 14:00   ` Bruce Richardson
2017-06-27 14:08 ` [dpdk-dev] [PATCH v5 00/12] bus: attach / detach API Bruce Richardson
2017-06-27 14:48   ` Gaëtan Rivet
2017-06-27 16:11 ` [dpdk-dev] [PATCH v6 00/11] " Gaetan Rivet
2017-06-27 16:11   ` [dpdk-dev] [PATCH v6 01/11] bus: add bus iterator to find a bus Gaetan Rivet
2017-06-27 16:11   ` [dpdk-dev] [PATCH v6 02/11] bus: add device iterator method Gaetan Rivet
2017-06-27 16:11   ` [dpdk-dev] [PATCH v6 03/11] bus: add helper to find which bus holds a device Gaetan Rivet
2017-06-27 16:11   ` [dpdk-dev] [PATCH v6 04/11] bus: add bus iterator to find " Gaetan Rivet
2017-06-27 16:11   ` [dpdk-dev] [PATCH v6 05/11] bus: introduce hotplug functionality Gaetan Rivet
2017-06-27 19:03     ` Jan Blunck
2017-06-28 11:44       ` Thomas Monjalon
2017-06-28 11:58         ` Jan Blunck
2017-06-28 12:11           ` Thomas Monjalon
2017-06-28 13:09             ` Jan Blunck
2017-06-28 13:30               ` Thomas Monjalon
2017-06-28 15:11                 ` Jan Blunck
2017-06-28 15:33                   ` Bruce Richardson
2017-06-29 12:59                     ` Gaëtan Rivet
2017-06-29 19:20                       ` Jan Blunck
2017-06-30 11:32                         ` Gaëtan Rivet
2017-06-27 16:11   ` [dpdk-dev] [PATCH v6 06/11] vdev: implement find_device bus operation Gaetan Rivet
2017-06-27 16:11   ` [dpdk-dev] [PATCH v6 07/11] vdev: implement hotplug " Gaetan Rivet
2017-06-27 16:11   ` [dpdk-dev] [PATCH v6 08/11] vdev: use standard bus registration function Gaetan Rivet
2017-07-03 22:15     ` Thomas Monjalon
2017-06-27 16:11   ` [dpdk-dev] [PATCH v6 09/11] pci: implement find_device bus operation Gaetan Rivet
2017-06-27 23:35     ` Stephen Hemminger
2017-06-28  9:17       ` Gaëtan Rivet
2017-06-28  9:52         ` Richardson, Bruce
2017-06-27 16:11   ` [dpdk-dev] [PATCH v6 10/11] pci: implement hotplug " Gaetan Rivet
2017-06-27 16:11   ` [dpdk-dev] [PATCH v6 11/11] dev: use new hotplug API in attach / detach Gaetan Rivet
2017-06-29 18:21   ` [dpdk-dev] [PATCH 00/15] bus attach/detach API and hotplug rework Jan Blunck
2017-06-29 18:21     ` [dpdk-dev] [PATCH v7 01/15] bus: add bus iterator to find a bus Jan Blunck
2017-06-29 18:21     ` [dpdk-dev] [PATCH v7 02/15] bus: add find_device bus operation Jan Blunck
2017-06-29 18:21     ` [dpdk-dev] [PATCH v7 03/15] vdev: implement " Jan Blunck
2017-06-29 18:21     ` [dpdk-dev] [PATCH v7 04/15] pci: " Jan Blunck
2017-06-29 18:21     ` [dpdk-dev] [PATCH v7 05/15] bus/fslmc: " Jan Blunck
2017-06-29 18:21     ` [dpdk-dev] [PATCH v7 06/15] bus: add helper to find which bus holds a device Jan Blunck
2017-06-30  9:16       ` Thomas Monjalon
2017-06-30 16:46         ` Jan Blunck
2017-06-30 18:29           ` Thomas Monjalon
2017-06-30 21:24             ` Bruce Richardson
2017-06-30 21:25           ` Bruce Richardson
2017-06-29 18:21     ` [dpdk-dev] [PATCH v7 07/15] bus: add bus iterator to find " Jan Blunck
2017-06-30  9:17       ` Thomas Monjalon
2017-06-29 18:21     ` [dpdk-dev] [PATCH v7 08/15] bus: require buses to implement find_device operation Jan Blunck
2017-06-29 18:22     ` [dpdk-dev] [PATCH v7 09/15] bus: add rte_bus_find_by_name Jan Blunck
2017-06-29 18:22     ` [dpdk-dev] [PATCH v7 10/15] bus: introduce device plug/unplug functionality Jan Blunck
2017-06-29 18:22     ` [dpdk-dev] [PATCH v7 11/15] vdev: implement unplug bus operation Jan Blunck
2017-06-29 18:22     ` [dpdk-dev] [PATCH v7 12/15] pci: implement hotplug " Jan Blunck
2017-06-29 18:22     ` [dpdk-dev] [PATCH v7 13/15] eal: add hotplug add/remove functions Jan Blunck
2017-06-30  9:06       ` Thomas Monjalon
2017-06-30  9:11         ` Gaëtan Rivet
2017-06-30  9:20           ` Bruce Richardson
2017-06-30 15:44             ` Jan Blunck
2017-06-30 16:03               ` Thomas Monjalon
2017-06-30 16:13                 ` Gaëtan Rivet
2017-06-30 16:25                   ` Bruce Richardson
2017-06-30 16:29                     ` Thomas Monjalon [this message]
2017-06-30 12:54       ` Thomas Monjalon
2017-06-30 15:12         ` Jan Blunck
2017-06-29 18:22     ` [dpdk-dev] [PATCH v7 14/15] dev: use new hotplug API in attach / detach Jan Blunck
2017-06-29 21:05       ` Thomas Monjalon
2017-06-29 18:22     ` [dpdk-dev] [PATCH v7 15/15] ethdev: Use embedded rte_device to detach driver Jan Blunck
2017-06-29 20:58       ` Thomas Monjalon
2017-06-30  9:59     ` [dpdk-dev] [PATCH 00/15] bus attach/detach API and hotplug rework Thomas Monjalon
2017-06-30 18:19     ` [dpdk-dev] [PATCH v8 00/14] " Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 01/14] bus: add bus iterator to find a bus Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 02/14] bus: add find_device bus operation Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 03/14] vdev: implement " Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 04/14] pci: " Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 05/14] bus/fslmc: " Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 06/14] bus: add helper to find which bus holds a device Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 07/14] bus: require buses to implement find_device operation Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 08/14] bus: add rte_bus_find_by_name Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 09/14] bus: introduce device plug/unplug functionality Jan Blunck
2017-06-30 18:38         ` Gaëtan Rivet
2017-06-30 18:52           ` Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 10/14] vdev: implement unplug bus operation Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 11/14] pci: implement hotplug " Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 12/14] eal: add hotplug add/remove functions Jan Blunck
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 13/14] ethdev: Use embedded rte_device to detach driver Jan Blunck
2017-07-03 23:17         ` Thomas Monjalon
2017-06-30 18:19       ` [dpdk-dev] [PATCH v8 14/14] dev: use new hotplug API in attach Jan Blunck
2017-07-03 22:59       ` [dpdk-dev] [PATCH v8 00/14] bus attach/detach API and hotplug rework Thomas Monjalon

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