Hi Frank Li, On 22/02/22 9:53 pm, Frank Li wrote: > This implement NTB function for PCIe EP to RC connections. > The existed ntb epf need two PCI EPs and two PCI Host. As I had earlier mentioned in [1], IMHO ideal solution would be build on virtio layer instead of trying to build on NTB layer (which is specific to RC<->RC communication). Are there any specific reasons for not taking that path? Thanks, Kishon [1] -> https://lore.kernel.org/r/459745d1-9fe7-e792-3532-33ee9552bc4d@xxxxxx > > This just need EP to RC connections. > > ┌────────────┐ ┌─────────────────────────────────────┐ > │ │ │ │ > ├────────────┤ │ ┌──────────────┤ > │ NTB │ │ │ NTB │ > │ NetDev │ │ │ NetDev │ > ├────────────┤ │ ├──────────────┤ > │ NTB │ │ │ NTB │ > │ Transfer │ │ │ Transfer │ > ├────────────┤ │ ├──────────────┤ > │ │ │ │ │ > │ PCI NTB │ │ │ │ > │ EPF │ │ │ │ > │ Driver │ │ │ PCI Virtual │ > │ │ ├───────────────┐ │ NTB Driver │ > │ │ │ PCI EP NTB │◄────►│ │ > │ │ │ FN Driver │ │ │ > ├────────────┤ ├───────────────┤ ├──────────────┤ > │ │ │ │ │ │ > │ PCI BUS │ ◄─────► │ PCI EP BUS │ │ Virtual PCI │ > │ │ PCI │ │ │ BUS │ > └────────────┘ └───────────────┴──────┴──────────────┘ > PCI RC PCI EP > > > > Frank Li (4): > PCI: designware-ep: Allow pci_epc_set_bar() update inbound map address > NTB: epf: Allow more flexibility in the memory BAR map method > PCI: endpoint: Support NTB transfer between RC and EP > Documentation: PCI: Add specification for the PCI vNTB function device > > Documentation/PCI/endpoint/index.rst | 2 + > .../PCI/endpoint/pci-vntb-function.rst | 126 ++ > Documentation/PCI/endpoint/pci-vntb-howto.rst | 167 ++ > drivers/ntb/hw/epf/ntb_hw_epf.c | 48 +- > .../pci/controller/dwc/pcie-designware-ep.c | 10 +- > drivers/pci/endpoint/functions/Kconfig | 11 + > drivers/pci/endpoint/functions/Makefile | 1 + > drivers/pci/endpoint/functions/pci-epf-vntb.c | 1424 +++++++++++++++++ > 8 files changed, 1775 insertions(+), 14 deletions(-) > create mode 100644 Documentation/PCI/endpoint/pci-vntb-function.rst > create mode 100644 Documentation/PCI/endpoint/pci-vntb-howto.rst > create mode 100644 drivers/pci/endpoint/functions/pci-epf-vntb.c >
