PCIe-based communications method and apparatus
A PCIe-based communications method includes: a root complex writes identity information of a second node into a first node and writes routing table information into a third node, where the first node is a source node of first data, the second node is a destination node of the first data, and the third node is a node through which the first data arrives at the second node.
1. A peripheral component interconnect express (PCIe)-based communications method, wherein the method comprises:
writing identity information of a second node into a first node, wherein the first node is a source node of first data, and the second node is a destination node of the first data;
writing routing table information into a third node, wherein the third node is a node through which the first data arrives at the second node; and
determining whether the first node supports a first working mode or whether the third node supports the first working mode, wherein the first working mode is a working mode in which communication between nodes does not use a root complex.
2. The method according to claim 1 , wherein the method further comprises:
determining that the first node supports the first working mode; or
determining that the first node supports the first working mode and a second working mode, wherein
the second working mode is a working mode in which communication between nodes uses the root complex.
3. The method according to claim 2 , wherein the method further comprises:
configuring a first memory address for the first node when the first node is in the second working mode, wherein the first memory address is a physical address in running memory corresponding to a central processing unit (CPU) to which local memory space of the first node is mapped.
4. The method according to claim 1 , wherein the method further comprises:
determining that the third node supports the first working mode; or
determining that the third node supports the first working mode and a second working mode, wherein
the second working mode is a working mode in which communication between nodes uses the root complex.
5. The method according to claim 4 , wherein the method further comprises:
configuring a second memory address for the third node when the third node is in the second working mode, wherein the second memory address is a physical address in running memory corresponding to a central processing unit (CPU) to which local memory space of the third node is mapped.
6. The method according to claim 1 , wherein the method further comprises:
writing identity information of the first node into the first node.
7. The method according to claim 1 , wherein the method further comprises:
writing identity information of the third node into the third node.
8. A peripheral component interconnect express (PCIe)-based communications apparatus, wherein the apparatus comprises:
a processor, configured to:
write identity information of a second node into a first node, wherein the first node is a source node of first data, and the second node is a destination node of the first data;
write routing table information into a third node, wherein the third node is a node through which the first data arrives at the second node; and
determine whether the first node supports a first working mode or whether the third node supports the first working mode, wherein the first working mode is a working mode in which communication between nodes does not use a root complex.
9. The apparatus according to claim 8 , wherein the processor is further configured to:
determine that the first node supports the first working mode; or
determine that the first node supports the first working mode and a second working mode, wherein
the second working mode is a working mode in which communication between nodes uses the root complex.
10. The apparatus according to claim 9 , wherein the processor is further configured to:
configure a first memory address for the first node when the first node is in the second working mode, wherein the first memory address is a physical address in running memory corresponding to a central processing unit (CPU) to which local memory space of the first node is mapped.
11. The apparatus according to claim 8 , wherein the processor is further configured to:
determine that the third node supports the first working mode; or
determine that the third node supports the first working mode and a second working mode, wherein
the second working mode is a working mode in which communication between nodes uses the root complex.
12. The apparatus according to claim 11 , wherein the processor is further configured to:
configure a second memory address for the third node when the third node is in the second working mode, wherein the second memory address is a physical address in running memory corresponding to a central processing unit (CPU) to which local memory space of the third node is mapped.
13. The apparatus according to claim 8 , wherein the processor is further configured to:
write identity information of the first node into the first node.
14. The apparatus according to claim 8 , wherein the processor is further configured to:
write identity information of the third node into the third node.
15. The apparatus according to claim 8 , wherein the identity information is a bus, device, and function number (BDF) or an identity (ID) number.
16. A peripheral component interconnect express (PCIe)-based communications apparatus, wherein the apparatus comprises:
a transceiver;
at least one processor; and
one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to cause the communications apparatus to:
determine identity information of a second node based on information stored in a first node, wherein the second node is a destination node of first data; and
send, through the transceiver, a first transaction layer packet (TLP) to a third node, wherein the first TLP comprises the first data and the identity information of the second node, wherein the first node supports a first working mode, the first working mode is a working mode in which communication between nodes does not use a root complex.
17. The apparatus according to claim 16 , wherein the first node supports the first working mode and a second working mode, and the second working mode is a working mode in which communication between nodes uses the root complex.
18. The apparatus according to claim 16 , wherein the stored information further comprises identity information of the first node.
19. The apparatus according to claim 18 , wherein the first TLP further comprises the identity information of the first node.