This patchset introduce a virtio-net EP device function. It provides a new option to communiate between PCIe host and endpoint over IP. Advantage of this option is that the driver fully uses a PCIe embedded DMA. It is used to transport data between virtio ring directly each other. It can be expected to better throughput. To realize the function, this patchset has few changes and introduces a new APIs to PCI EP framework related to virtio. Furthermore, it device depends on the some patchtes that is discussing. Those depended patchset are following: - [PATCH 1/2] dmaengine: dw-edma: Fix to change for continuous transfer link: https://lore.kernel.org/dmaengine/20221223022608.550697-1-mie@xxxxxxxxxx/ - [RFC PATCH 0/3] Deal with alignment restriction on EP side link: https://lore.kernel.org/linux-pci/20230113090350.1103494-1-mie@xxxxxxxxxx/ - [RFC PATCH v2 0/7] Introduce a vringh accessor for IO memory link: https://lore.kernel.org/virtualization/20230202090934.549556-1-mie@xxxxxxxxxx/ About this patchset has 4 patches. The first of two patch is little changes to virtio. The third patch add APIs to easily access virtio data structure on PCIe Host side memory. The last one introduce a virtio-net EP device function. Details are in commit respectively. Currently those network devices are testd using ping only. I'll add a result of performance evaluation using iperf and etc to the future version of this patchset. Shunsuke Mie (4): virtio_pci: add a definition of queue flag in ISR virtio_ring: remove const from vring getter PCI: endpoint: Introduce virtio library for EP functions PCI: endpoint: function: Add EP function driver to provide virtio net device drivers/pci/endpoint/Kconfig | 7 + drivers/pci/endpoint/Makefile | 1 + drivers/pci/endpoint/functions/Kconfig | 12 + drivers/pci/endpoint/functions/Makefile | 1 + .../pci/endpoint/functions/pci-epf-vnet-ep.c | 343 ++++++++++ .../pci/endpoint/functions/pci-epf-vnet-rc.c | 635 ++++++++++++++++++ drivers/pci/endpoint/functions/pci-epf-vnet.c | 387 +++++++++++ drivers/pci/endpoint/functions/pci-epf-vnet.h | 62 ++ drivers/pci/endpoint/pci-epf-virtio.c | 113 ++++ drivers/virtio/virtio_ring.c | 2 +- include/linux/pci-epf-virtio.h | 25 + include/linux/virtio.h | 2 +- include/uapi/linux/virtio_pci.h | 2 + 13 files changed, 1590 insertions(+), 2 deletions(-) create mode 100644 drivers/pci/endpoint/functions/pci-epf-vnet-ep.c create mode 100644 drivers/pci/endpoint/functions/pci-epf-vnet-rc.c create mode 100644 drivers/pci/endpoint/functions/pci-epf-vnet.c create mode 100644 drivers/pci/endpoint/functions/pci-epf-vnet.h create mode 100644 drivers/pci/endpoint/pci-epf-virtio.c create mode 100644 include/linux/pci-epf-virtio.h -- 2.25.1
