PCIE-based data transmission method and apparatus
This application discloses a peripheral component interconnect express (PCIe)-based data transmission method and apparatus. The method includes: A first node encapsulates data into a transaction layer packet (TLP) and then sends the TLP to a second node. The TLP includes a packet header and an extension header. The packet header includes a first field and a second field. The first field, the second field, and the extension header are used to indicate first encapsulation information. The first encapsulation information includes a data type of the data and at least one encapsulation parameter corresponding to the data type. In some embodiments, the first field, the second field, and the extension header are used to indicate the information required for transmitting the data.
1. A peripheral component interconnect express (PCIe)-based data transmission method, comprising:
encapsulating, by a first node, data into a transaction layer packet (TLP), wherein the TLP comprises a packet header and an extension header, the packet header comprises a first field and a second field, wherein the first field comprises a type field and the second field comprises a T9 field, the type field and the T9 field are jointly encoded to indicate a data type of the data, and the extension header is used to indicate at least one encapsulation parameter corresponding to the data type, the data type comprises at least one of an image, audio, control information, stream write (SWRITE), or security, and the at least one encapsulation parameter represents at least one attribute of the data type; and
sending, by the first node, the TLP to a second node.
2. The method according to claim 1 , wherein a value of a bit set indicates the data type, and the bit set comprises a bit in the first field and a bit in the second field; and
the extension header carries the at least one encapsulation parameter.
3. The method according to claim 1 , wherein the second field is a reserved bit.
4. The method according to claim 1 , wherein the packet header further comprises a third field, the third field carries another encapsulation parameter, other than the at least one encapsulation parameter.
5. The method according to claim 4 , wherein the third field is byte 4 to byte 15 or byte 4 to byte 11 of the packet header.
6. The method according to claim 1 , wherein the data type is an image, and the at least one encapsulation parameter comprises at least one of an image data type, pixel quantization depth, resolution, or segment indication information.
7. The method according to claim 1 , wherein the first field is a reserved value.
8. A peripheral component interconnect express (PCIe)-based data transmission apparatus, comprising:
a communications interface;
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:
encapsulate data into a transaction layer packet (TLP), wherein the TLP comprises a packet header and an extension header, the packet header comprises a first field and a second field, wherein the first field comprises a type field, the second field comprises a T9 field, the type field and the T9 field are jointly encoded to indicate a data type of the data, and the extension header is used to indicate at least one encapsulation parameter corresponding to the data type, the data type comprises at least one of an image, audio, control information, stream write (SWRITE), or security, and the at least one encapsulation parameter represents at least one attribute of the data type; and
cause the communications interface to send the TLP to a second node.
9. The apparatus according to claim 8 , wherein a value of a bit set indicates the data type, and the bit set comprises a bit in the first field and a bit in the second field; and
the extension header carries the at least one encapsulation parameter.
10. The apparatus according to claim 8 , wherein the second field is a reserved bit.
11. The apparatus according to claim 8 , wherein the packet header further comprises a third field, the third field carries another encapsulation parameter, other than the at least one encapsulation parameter.
12. A peripheral component interconnect express (PCIe)-based data transmission apparatus, comprising:
a first communications interface, configured to transmit data with a first node;
a second communications interface, configured to transmit data with a third node;
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 receive, by using the first communications interface, a first transaction layer packet (TLP) sent by the first node, and send a second TLP to the third node by using the second communications interface, wherein:
a TLP comprises a packet header and an extension header, wherein the packet header comprises a first field and a second field, the first field comprises a type field, the second field comprises a T9 field, the type field and the T9 field are jointly encoded to indicate a data type of the data, and the extension header is used to indicate at least one encapsulation parameter corresponding to the data type, the data type comprises at least one of an image, audio, control information, stream write (SWRITE), or security, the at least one encapsulation parameter represents at least one attribute of the data type, and the TLP comprises at least one of the first TLP or the second TLP.
13. The apparatus according to claim 12 , wherein a value of a bit set indicates the data type, and the bit set comprises a bit in the first field and a bit in the second field; and
the extension header carries the at least one encapsulation parameter.
14. The apparatus according to claim 12 , wherein the first field is a type field, and the second field is a reserved bit.
15. The apparatus according to claim 12 , wherein the packet header further comprises a third field, the third field carries another encapsulation parameter, other than the at least one encapsulation parameter.
16. The apparatus according to claim 12 , wherein the first TLP carries identity information of the third node;
the programming instructions are further for execution by the at least one processor to:
before sending the second TLP to the third node by using the second communications interface, select a routing path based on the identity information of the third node; and
when sending the second TLP to the third node by using the second communications interface, send the second TLP to the third node according to the routing path.
17. The method according to claim 1 , wherein the data type is audio, and the at least one encapsulation parameter comprises at least one of a sampling quantization format, sampling frequency, quantization depth, or quantity of audio channels/channels.