vDPA driver for Alibaba ENI

This series implements the vDPA driver for Alibaba ENI(Elastic Network
Interface) which is build based on virtio-pci 0.9.5 specification.

Changes since V4:
- check return values of get_vq_num_{max,min} when probing devices
- disable the driver on BE host via Kconfig
- add missing commit message

Changes since V3:
- validate VIRTIO_NET_F_MRG_RXBUF when negotiate features
- present F_ORDER_PLATFORM in get_features
- remove endian check since ENI always use litter endian

Changes since V2:
- add new attribute VDPA_ATTR_DEV_MIN_VQ_SIZE instead
  VDPA_ATTR_DEV_F_VERSION_1 to guide users to choose correct virtqueue
  size as suggested by Jason Wang
- present ACCESS_PLATFORM in get_features callback as suggested by Jason
  Wang
- disable this driver on Big Endian host as suggested by Jason Wang
- fix a typo

Changes since V1:
- add new vdpa attribute VDPA_ATTR_DEV_F_VERSION_1 to indicate whether
  the vdpa device is legacy
- implement dedicated driver for Alibaba ENI instead a legacy virtio-pci
  driver as suggested by Jason Wang
- some bugs fixed

Wu Zongyong (8):
  virtio-pci: introduce legacy device module
  vdpa: fix typo
  vp_vdpa: add vq irq offloading support
  vdpa: add new callback get_vq_num_min in vdpa_config_ops
  vdpa: min vq num of vdpa device cannot be greater than max vq num
  virtio_vdpa: setup correct vq size with callbacks get_vq_num_{max,min}
  vdpa: add new attribute VDPA_ATTR_DEV_MIN_VQ_SIZE
  eni_vdpa: add vDPA driver for Alibaba ENI

 drivers/vdpa/Kconfig                   |   8 +
 drivers/vdpa/Makefile                  |   1 +
 drivers/vdpa/alibaba/Makefile          |   3 +
 drivers/vdpa/alibaba/eni_vdpa.c        | 553 +++++++++++++++++++++++++
 drivers/vdpa/vdpa.c                    |  13 +
 drivers/vdpa/virtio_pci/vp_vdpa.c      |  12 +
 drivers/virtio/Kconfig                 |  10 +
 drivers/virtio/Makefile                |   1 +
 drivers/virtio/virtio_pci_common.c     |  10 +-
 drivers/virtio/virtio_pci_common.h     |   9 +-
 drivers/virtio/virtio_pci_legacy.c     | 101 ++---
 drivers/virtio/virtio_pci_legacy_dev.c | 220 ++++++++++
 drivers/virtio/virtio_vdpa.c           |  21 +-
 include/linux/vdpa.h                   |   6 +-
 include/linux/virtio_pci_legacy.h      |  44 ++
 include/uapi/linux/vdpa.h              |   1 +
 16 files changed, 924 insertions(+), 89 deletions(-)
 create mode 100644 drivers/vdpa/alibaba/Makefile
 create mode 100644 drivers/vdpa/alibaba/eni_vdpa.c
 create mode 100644 drivers/virtio/virtio_pci_legacy_dev.c
 create mode 100644 include/linux/virtio_pci_legacy.h

-- 
2.31.1