[dpdk-dev] [PATCH v7 0/5] add ifcvf vdpa driver

[Xiao Wang]

IFCVF driver
============
The IFCVF vDPA (vhost data path acceleration) driver provides support for the
Intel FPGA 100G VF (IFCVF). IFCVF's datapath is virtio ring compatible, it
works as a HW vhost backend which can send/receive packets to/from virtio
directly by DMA. Besides, it supports dirty page logging and device state
report/restore. This driver enables its vDPA functionality with live migration
feature.

vDPA mode
=========
IFCVF's vendor ID and device ID are same as that of virtio net pci device,
with its specific subsystem vendor ID and device ID. To let the device be
probed by IFCVF driver, adding "vdpa=1" parameter helps to specify that this
device is to be used in vDPA mode, rather than polling mode, virtio pmd will
skip when it detects this message.

Container per device
====================
vDPA needs to create different containers for different devices, thus this
patch set adds some APIs in eal/vfio to support multiple container, e.g.
- rte_vfio_create_container
- rte_vfio_destroy_container
- rte_vfio_bind_group
- rte_vfio_unbind_group

By this extension, a device can be put into a new specific container, rather
than the previous default container.

IFCVF vDPA details
==================
Key vDPA driver ops implemented:
- ifcvf_dev_config:
  Enable VF data path with virtio information provided by vhost lib, including
  IOMMU programming to enable VF DMA to VM's memory, VFIO interrupt setup to
  route HW interrupt to virtio driver, create notify relay thread to translate
  virtio driver's kick to a MMIO write onto HW, HW queues configuration.

  This function gets called to set up HW data path backend when virtio driver
  in VM gets ready.

- ifcvf_dev_close:
  Revoke all the setup in ifcvf_dev_config.

  This function gets called when virtio driver stops device in VM.

Change log
==========
v7:
- Rebase on HEAD.
- Split the vfio patch into 2 parts, one for data structure extension, one for
  adding new API.
- Use static vfio_config array instead of dynamic alloating.
- Change rte_vfio_container_dma_map/unmap's parameters to use (va, iova, len).

v6:
- Rebase on master branch.
- Document "vdpa" devarg in virtio documentation.
- Rename ifcvf config option to CONFIG_RTE_LIBRTE_IFCVF_VDPA_PMD for
  consistensy, and add it into driver documentation.
- Add comments for ifcvf device ID.
- Minor code cleaning.

v5:
- Fix compilation in BSD, remove the rte_vfio.h including in BSD.

v4:
- Rebase on Zhihong's latest vDPA lib patch, with vDPA ops names change.
- Remove API "rte_vfio_get_group_fd", "rte_vfio_bind_group" will return the fd.
- Align the vfio_cfg search internal APIs naming.

v3:
- Add doc and release note for the new driver.
- Remove the vdev concept, make the driver as a PCI driver, it will get probed
  by PCI bus driver.
- Rebase on the v4 vDPA lib patch, register a vDPA device instead of a engine.
- Remove the PCI API exposure accordingly.
- Move the MAX_VFIO_CONTAINERS definition to config file.
- Let virtio pmd skips when a virtio device needs to work in vDPA mode.

v2:
- Rename function pci_get_kernel_driver_by_path to rte_pci_device_kdriver_name
  to make the API generic cross Linux and BSD, make it as EXPERIMENTAL.
- Rebase on Zhihong's vDPA v3 patch set.
- Minor code cleanup on vfio extension.


Xiao Wang (5):
  vfio: extend data structure for multi container
  vfio: add multi container support
  net/virtio: skip device probe in vdpa mode
  net/ifcvf: add ifcvf vdpa driver
  doc: add ifcvf driver document and release note

 config/common_base                       |   8 +
 config/common_linuxapp                   |   1 +
 doc/guides/nics/features/ifcvf.ini       |   8 +
 doc/guides/nics/ifcvf.rst                |  98 ++++
 doc/guides/nics/index.rst                |   1 +
 doc/guides/nics/virtio.rst               |  13 +
 doc/guides/rel_notes/release_18_05.rst   |   9 +
 drivers/net/Makefile                     |   3 +
 drivers/net/ifc/Makefile                 |  36 ++
 drivers/net/ifc/base/ifcvf.c             | 329 ++++++++++++
 drivers/net/ifc/base/ifcvf.h             | 160 ++++++
 drivers/net/ifc/base/ifcvf_osdep.h       |  52 ++
 drivers/net/ifc/ifcvf_vdpa.c             | 842 +++++++++++++++++++++++++++++++
 drivers/net/ifc/rte_ifcvf_version.map    |   4 +
 drivers/net/virtio/virtio_ethdev.c       |  43 ++
 lib/librte_eal/bsdapp/eal/eal.c          |  52 ++
 lib/librte_eal/common/include/rte_vfio.h | 119 +++++
 lib/librte_eal/linuxapp/eal/eal_vfio.c   | 723 +++++++++++++++++++++-----
 lib/librte_eal/linuxapp/eal/eal_vfio.h   |  19 +-
 lib/librte_eal/rte_eal_version.map       |   6 +
 mk/rte.app.mk                            |   3 +
 21 files changed, 2377 insertions(+), 152 deletions(-)
 create mode 100644 doc/guides/nics/features/ifcvf.ini
 create mode 100644 doc/guides/nics/ifcvf.rst
 create mode 100644 drivers/net/ifc/Makefile
 create mode 100644 drivers/net/ifc/base/ifcvf.c
 create mode 100644 drivers/net/ifc/base/ifcvf.h
 create mode 100644 drivers/net/ifc/base/ifcvf_osdep.h
 create mode 100644 drivers/net/ifc/ifcvf_vdpa.c
 create mode 100644 drivers/net/ifc/rte_ifcvf_version.map

-- 
2.15.1