Messages in this thread | | | From | Wu Zongyong <> | Subject | [PATCH 0/6] vDPA driver for legacy virtio-pci device | Date | Wed, 8 Sep 2021 20:20:31 +0800 |
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This series implements the vDPA driver for legacy virtio-pci device. Currently we already have the vDPA driver for modern virtio-pci device only, but there are some legacy virtio-pci devices conforming to the virtio-pci specifications of 0.9.x or older versions. For example, ENI(Elastic Network Interface) of Alibaba ECS baremetal instance is a hardware virtio network device which follows the Virtio PCI Card 0.9.5 Draft specification. Such legacy virtio-pci devices have some inconsistent behaviour with modern virtio-pci devices, so some common codes are split out and modern device specific codes are moved to a separated file.
For legacy devices, it is not supported to negotiate the virtqueue size by the specification. So a new callback get_vq_num_unchangeable is introduced to indicate user not to try change the virtqueue size of the legacy vdpa device. For example, QEMU should not allocate memory for virtqueue according to the properties tx_queue_size and rx_queue_size if we use legacy virtio-pci device as the vhost-vdpa backend. Instead, QEMU should use the new callback get_vq_num_unchangeable first to check if the vdpa device support to change virtqueue size. If not, QEMU should call the callback get_vq_num_max to get the static virtqueue size then allocate the same size memory for the virtqueue.
This series have been tested with the ENI in Alibaba ECS baremetal instance.
These patches may under consideration, welcome for comments.
Wu Zongyong (6): virtio-pci: introduce legacy device module vdpa: fix typo vp_vdpa: add vq irq offloading support vp_vdpa: split out reusable and device specific codes to separate file vdpa: add get_vq_num_unchangeable callback in vdpa_config_ops vp_vdpa: introduce legacy virtio pci driver
drivers/vdpa/Kconfig | 7 + drivers/vdpa/virtio_pci/Makefile | 3 + drivers/vdpa/virtio_pci/vp_vdpa.c | 8 + drivers/vdpa/virtio_pci/vp_vdpa_common.c | 220 ++++++++++++++ drivers/vdpa/virtio_pci/vp_vdpa_common.h | 67 +++++ drivers/vdpa/virtio_pci/vp_vdpa_legacy.c | 346 +++++++++++++++++++++++ drivers/vdpa/virtio_pci/vp_vdpa_modern.c | 327 +++++++++++++++++++++ drivers/vhost/vdpa.c | 19 ++ 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 | 5 +- include/linux/vdpa.h | 6 +- include/linux/virtio_pci_legacy.h | 44 +++ include/uapi/linux/vhost.h | 2 + 18 files changed, 1320 insertions(+), 85 deletions(-) create mode 100644 drivers/vdpa/virtio_pci/vp_vdpa_common.c create mode 100644 drivers/vdpa/virtio_pci/vp_vdpa_common.h create mode 100644 drivers/vdpa/virtio_pci/vp_vdpa_legacy.c create mode 100644 drivers/vdpa/virtio_pci/vp_vdpa_modern.c create mode 100644 drivers/virtio/virtio_pci_legacy_dev.c create mode 100644 include/linux/virtio_pci_legacy.h
-- 2.31.1
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