[dpdk-dev] [PATCH V16 0/3] add device event monitor framework

Jeff Guo jia.guo at intel.com
Mon Mar 26 12:55:38 CEST 2018


About hot plug in dpdk, We already have proactive way to add/remove devices
through APIs (rte_eal_hotplug_add/remove), and also have fail-safe driver to
offload the fail-safe work from the app user. But there are still lack of a
general mechanism to monitor hotplug event for all driver, now the hotplug
interrupt event is diversity between each device and driver, such as mlx4,
pci driver and others.

Use the hot removal event for example, pci drivers not all exposure the
remove interrupt, so in order to make user to easy use the hot plug feature
for pci driver, something must be done to detect the remove event at the
kernel level and offer a new line of interrupt to the user land.

Base on the uevent of kobject mechanism in kernel, we could use it to
benefit for monitoring the hot plug status of the device which not only
uio/vfio of pci bus devices, but also other, such as cpu/usb/pci-express
bus devices.

The idea is comming as bellow.

a.The uevent message form FD monitoring which will be useful.
remove@/devices/pci0000:80/0000:80:02.2/0000:82:00.0/0000:83:03.0/0000:84:00.2/uio/uio2
ACTION=remove
DEVPATH=/devices/pci0000:80/0000:80:02.2/0000:82:00.0/0000:83:03.0/0000:84:00.2/uio/uio2
SUBSYSTEM=uio
MAJOR=243
MINOR=2
DEVNAME=uio2
SEQNUM=11366

b.add uevent monitoring machanism:
add several general api to enable uevent monitoring.

c.add common uevent handler and uevent failure handler
uevent of device should be handler at bus or device layer, and the memory read
and write failure when hot removal should be handle correctly before detach behaviors.

d.show example how to use uevent monitor
enable uevent monitoring in testpmd or fail-safe to show usage.

patchset history:
v16->v15:
1.remove some linux related code out of eal common layer
2.fix some uneasy readble issue.

v15->v14:
1.use exist eal interrupt epoll to replace of rte service usage for monitor thread,
2.add new device event handle type in eal interrupt.
3.remove the uevent type check and any policy from eal,
let it check and management in user's callback.
4.add "--hot-plug" configure parameter in testpmd to switch the hotplug feature.

v14->v13:
1.add __rte_experimental on function defind and fix bsd build issue

v13->v12:
1.fix some logic issue and null check issue
2.fix monitor stop func issue

v12->v11:
1.identify null param in callback for monitor all devices uevent

v11->v10:
1:modify some typo and add experimental tag in new file.
2:modify callback register calling.

v10->v9:
1.fix prefix issue.
2.use a common callback lists for all device and all type to replace
add callback parameter into device struct.
3.delete some unuse part.

v9->v8:
split the patch set into small and explicit patch

v8->v7:
1.use rte_service to replace pthread management.
2.fix defind issue and copyright issue
3.fix some lock issue

v7->v6:
1.modify vdev part according to the vdev rework
2.re-define and split the func into common and bus specific code
3.fix some incorrect issue.
4.fix the system hung after send packcet issue.

v6->v5:
1.add hot plug policy, in eal, default handle to prepare hot plug work for
all pci device, then let app to manage to deside which device need to
hot plug.
2.modify to manage event callback in each device.
3.fix some system hung issue when igb_uio release.
4.modify the pci part to the bus-pci base on the bus rework.
5.add hot plug policy in app, show example to use hotplug list to manage
to deside which device need to hot plug.

v5->v4:
1.Move uevent monitor epolling from eal interrupt to eal device layer.
2.Redefine the eal device API for common, and distinguish between linux and bsd
3.Add failure handler helper api in bus layer.Add function of find device by name.
4.Replace of individual fd bind with single device, use a common fd to polling all device.
5.Add to register hot insertion monitoring and process, add function to auto bind driver befor user add device
6.Refine some coding style and typos issue
7.add new callback to process hot insertion

v4->v3:
1.move uevent monitor api from eal interrupt to eal device layer.
2.create uevent type and struct in eal device.
3.move uevent handler for each driver to eal layer.
4.add uevent failure handler to process signal fault issue.
5.add example for request and use uevent monitoring in testpmd.

v3->v2:
1.refine some return error
2.refine the string searching logic to avoid memory issue

v2->v1:
1.remove global variables of hotplug_fd, add uevent_fd
in rte_intr_handle to let each pci device self maintain it fd,
to fix dual device fd issue.
2.refine some typo error.


Jeff Guo (3):
  eal: add device event handle in interrupt thread
  eal: add device event monitor framework
  app/testpmd: enable device hotplug monitoring

 app/test-pmd/parameters.c                          |   5 +-
 app/test-pmd/testpmd.c                             | 195 ++++++++++++++++++++-
 app/test-pmd/testpmd.h                             |  11 ++
 lib/librte_eal/bsdapp/eal/Makefile                 |   1 +
 lib/librte_eal/bsdapp/eal/eal_dev.c                |  19 ++
 lib/librte_eal/common/eal_common_dev.c             | 145 +++++++++++++++
 lib/librte_eal/common/eal_private.h                |  24 +++
 lib/librte_eal/common/include/rte_dev.h            |  92 ++++++++++
 lib/librte_eal/common/include/rte_eal_interrupts.h |   1 +
 lib/librte_eal/linuxapp/eal/Makefile               |   1 +
 lib/librte_eal/linuxapp/eal/eal_dev.c              |  20 +++
 lib/librte_eal/linuxapp/eal/eal_interrupts.c       |   5 +-
 12 files changed, 516 insertions(+), 3 deletions(-)
 create mode 100644 lib/librte_eal/bsdapp/eal/eal_dev.c
 create mode 100644 lib/librte_eal/linuxapp/eal/eal_dev.c

-- 
2.7.4



More information about the dev mailing list