System and method for providing address decode and virtual function (VF) migration support in a peripheral component interconnect express (PCIE) multi-root input/output virtualization (IOV) environment
The present invention is a method for providing address decode and Virtual Function (VF) migration support in a Peripheral Component Interconnect Express (PCIE) multi-root Input/Output Virtualization (IOV) environment. The method may include receiving a Transaction Layer Packet (TLP) from the PCIE multi-root IOV environment. The method may further include comparing a destination address of the TLP with a plurality of base address values stored in a Content Addressable Memory (CAM), each base address value being associated with a Virtual Function (VF), each VF being associated with a Physical Function (PF). The method may further include when a base address value included in the plurality of base address values matches the destination address of the TLP, providing the matching base address value to the PCIE multi-root IOV environment by outputting from the CAM the matching base address value. The method may further include constructing a requestor ID for the VF associated with the matching base address value, the requestor ID being based upon the output matching base address value and a bus number for a PF which owns the CAM.
1. A method for providing address decode and Virtual Function (VF) migration support in a Peripheral Component Interconnect Express (PCIE) multi-root Input/Output Virtualization (IOV) environment, comprising:
receiving a Transaction Layer Packet (TLP) from the PCIE multi-root IOV environment;
comparing a destination address of the TLP with a plurality of base address values stored in a Content Addressable Memory (CAM), each base address value being associated with a Virtual Function (VF), each VF being associated with a Physical Function (PF);
when a base address value included in the plurality of base address values matches the destination address of the TLP, providing the matching base address value to the PCIE multi-root IOV environment by outputting from the CAM the matching base address value; and
constructing a requestor ID for the VF associated with the matching base address value, the requestor ID being based upon the output matching base address value and a bus number for a PF which owns the CAM.
2. A method as claimed in claim 1 , further comprising:
providing the requestor ID to the PCIE multi-root IOV environment via a completion packet.
3. A method as claimed in claim 2 , further comprising:
receiving a CAM update request from the PCIE multi-root IOV environment.
4. A method as claimed in claim 3 , further comprising:
determining if an update of the CAM is required.
5. A method as claimed in claim 4 , further comprising:
when it is determined that an update of the CAM is required, writing new base address values to the CAM.
6. A method as claimed in claim 5 , further comprising:
receiving a VF migration request from the PCIE IOV environment.
7. A method as claimed in claim 6 , further comprising:
mapping an unmapped Logical Virtual Function (LVF) to a Mission Virtual Function (MVF).
8. A method as claimed in claim 7 , further comprising:
enabling base address decoding for a VF which has undergone a migrate-in event.
9. A method as claimed in claim 8 , further comprising:
accessing base address values for the VF which has undergone the migrate-in event from a configuration space of the PCIE multi-root IOV environment.
10. A method as claimed in claim 9 , further comprising:
updating the CAM by writing the base address values to the CAM for the VF which has undergone the migrate-in event.
11. A non-transitory computer-readable medium having computer-executable instructions for performing a method for providing address decode and Virtual Function (VF) migration support in a Peripheral Component Interconnect Express (PCIE) multi-root Input/Output Virtualization (IOV) environment, said method comprising: receiving a Transaction Layer Packet (TLP) from the PCIE multi-root IOV environment; comparing a destination address of the TLP with a plurality of base address values stored in a Content Addressable Memory (CAM), each base address value being associated with a Virtual Function (VF), each VF being associated with a Physical Function (PF); when a base address value included in the plurality of base address values matches the destination address of the TLP, providing the matching base address value to the PCIE multi-root IOV environment by outputting from the CAM the matching base address value; and constructing a requestor ID for the VF associated with the matching base address value, the requestor ID being based upon the output matching base address value and a bus number for a PF which owns the CAM.
12. A computer-readable medium as claimed in claim 11 , said method further comprising:
providing the requestor ID to the PCIE multi-root IOV environment via a completion packet.
13. A computer-readable medium as claimed in claim 12 , said method further comprising:
receiving a CAM update request from the PCIE multi-root IOV environment.
14. A computer-readable medium as claimed in claim 13 , said method further comprising:
determining if an update of the CAM is required.
15. A computer-readable medium as claimed in claim 14 , said method further comprising:
when it is determined that an update of the CAM is required, writing new base address values to the CAM.
16. A computer-readable medium as claimed in claim 15 , said method further comprising:
receiving a VF migration request from the PCIE IOV environment.
17. A computer-readable medium as claimed in claim 16 , said method further comprising:
mapping an unmapped Logical Virtual Function (LVF) to a Mission Virtual Function (MVF); and
enabling base address decoding for a VF which has undergone a migrate-in event.
18. A computer-readable medium as claimed in claim 17 , said method further comprising:
accessing base address values for the VF which has undergone the migrate-in event from a configuration space of the PCIE multi-root IOV environment.
19. A computer-readable medium as claimed in claim 18 , said method further comprising:
updating the CAM by writing the base address values to the CAM for the VF which has undergone the migrate-in event.