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NTB: EPF: support NTB transfer between PCI RC and EP connection
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Add NTB function driver and virtual PCI BUS and Virtual NTB driver
to implement communication between PCIe RC and PCIe EP devices

┌────────────┐         ┌─────────────────────────────────────┐
│            │         │                                     │
├────────────┤         │                      ┌──────────────┤
│ 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

This driver include 3 part:
 1 PCI EP NTB function driver
 2 Virtual PCI bus
 3 PCI virutal NTB driver, which is loaded only by above virtual pci bus

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
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Frank Li authored and Jon Mason committed Jul 18, 2022
1 parent 8a78545 commit da51fd2
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11 changes: 11 additions & 0 deletions drivers/pci/endpoint/functions/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -25,3 +25,14 @@ config PCI_EPF_NTB
device tree.

If in doubt, say "N" to disable Endpoint NTB driver.

config PCI_EPF_VNTB
tristate "PCI Endpoint NTB driver"
depends on PCI_ENDPOINT
select CONFIGFS_FS
help
Select this configuration option to enable the Non-Transparent
Bridge (NTB) driver for PCI Endpoint. NTB driver implements NTB
between PCI host and PCIe Endpoint.

If in doubt, say "N" to disable Endpoint NTB driver.
1 change: 1 addition & 0 deletions drivers/pci/endpoint/functions/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -5,3 +5,4 @@

obj-$(CONFIG_PCI_EPF_TEST) += pci-epf-test.o
obj-$(CONFIG_PCI_EPF_NTB) += pci-epf-ntb.o
obj-$(CONFIG_PCI_EPF_VNTB) += pci-epf-vntb.o
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