阅读说明：本技术 一种PCIe通信装置及BMC (PCIe communication device and BMC ) 是由 赵元 李拓 符云越 于 2021-07-31 设计创作，主要内容包括：本发明公开了一种PCIe通信装置及BMC,该PCIe通信装置包括：一级上游接口单元,用于与本地主机连接；二级上游接口单元,用于与远程主机连接；下游接口单元,用于通过通信接口与PCIe设备连接；交换矩阵单元,用于转发一级上游接口单元与对应的下游接口单元之间的PCIe通信报文和/或二级上游接口单元与对应的下游接口单元之间的PCIe通信报文；本发明利用二级上游接口单元与远程主机连接,实现远程跨节点的PCIe互联扩展；通过交换矩阵单元转发一级上游接口单元和/或二级上游接口单元与各自对应的下游接口单元之间的PCIe通信报文,能够实现PCIe设备的动态切换,节省了运维成本,提升了PCIe设备的利用率。(The invention discloses a PCIe communication device and a BMC, wherein the PCIe communication device comprises: the primary upstream interface unit is used for being connected with a local host; the secondary upstream interface unit is used for connecting with a remote host; the downstream interface unit is used for being connected with the PCIe equipment through a communication interface; the switching matrix unit is used for forwarding PCIe communication messages between the primary upstream interface unit and the corresponding downstream interface unit and/or PCIe communication messages between the secondary upstream interface unit and the corresponding downstream interface unit; the invention utilizes the connection of the secondary upstream interface unit and the remote host to realize the PCIe interconnection expansion of remote cross-nodes; through the forwarding of the PCIe communication messages between the primary upstream interface unit and/or the secondary upstream interface unit and the corresponding downstream interface unit by the switching matrix unit, the dynamic switching of PCIe devices can be realized, the operation and maintenance cost is saved, and the utilization rate of the PCIe devices is improved.)

1. A PCIe communications apparatus, comprising:

the primary upstream interface unit is used for being connected with a local host;

the secondary upstream interface unit is used for connecting with a remote host;

the downstream interface unit is used for being connected with the PCIe equipment through a communication interface;

and the switching matrix unit is used for forwarding PCIe communication messages between the primary upstream interface unit and the corresponding downstream interface unit and/or PCIe communication messages between the secondary upstream interface unit and the corresponding downstream interface unit.

2. The PCIe communications device of claim 1, wherein the communications interface comprises a remote interface and a local interface.

3. PCIe communication device according to claim 2, wherein the remote interface is in particular a remote high-speed optical interface.

4. The PCIe communications apparatus according to claim 1, wherein the switch matrix unit is specifically configured to forward PCIe communications packets sent by the primary upstream interface unit and/or the secondary upstream interface unit to respective corresponding downstream interface units by using a link configuration information table, and forward PCIe communications packets sent by each of the downstream interface units to respective corresponding primary upstream interface units or any secondary upstream interface units.

5. The PCIe communication device of any of claims 1 to 4, further comprising:

the management and control unit is used for configuring a PCIe communication link between each target PCIe device and the local host or any target remote host so as to finish the binding of the target PCIe device and the corresponding local host or any target remote host; each target PCIe device is one PCIe device connected with any downstream interface unit, and each target remote host is one remote host connected with any secondary upstream interface unit.

6. The PCIe communications apparatus of claim 5, wherein the policing unit is specifically configured to configure one remote host corresponding to each of the secondary upstream interface units, one PCIe device corresponding to each of the downstream interface units, and one primary upstream interface unit or one secondary upstream interface unit corresponding to each of the downstream interface units.

7. The PCIe communications apparatus of claim 5, wherein the current downstream interface unit is further configured to send an interrupt request corresponding to a PCIe device hot plug to the local host to control the local host driver to load the current PCIe device when configured to correspond to the primary upstream interface unit; the current downstream interface unit is any downstream interface unit, and the current PCIe device is a PCIe device corresponding to the current downstream interface unit.

8. The PCIe communication apparatus according to claim 7, wherein the current downstream interface unit is specifically configured to send a PCIe device hot-unplug corresponding interrupt request to the local host according to the configuration unbinding instruction of the management and control unit after the local host driver loads the current PCIe device, so as to control the local host to unbind the current PCIe device.

9. The PCIe communication apparatus of claim 5, wherein the policing unit is specifically configured to configure the PCIe communication link according to a configuration instruction sent by an out-of-band management system of the BMC.

10. A BMC, comprising: the PCIe communication device as specified in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of server application, in particular to a PCIe communication device and a BMC.

Background

With the continuous development of the application field of the server, the application requirements of the high-end server have entered an important stage. The complex system structure supports the high-end server system to realize high performance indexes, namely, the characteristics of high safety, high availability, high reliability and the like. The BMC (Baseboard Management Controller) is used as an out-of-band Management system of the server, and has irreplaceable functions for stable operation, maintenance, Management, system upgrade, remote monitoring, and the like of the server system.

With the continuous increase of the complexity and performance of the server system, the resource demand of the out-of-band management system for the BMC is higher and higher, but on the other hand, the PCIe (Peripheral Component Interconnect Express) interface resource of the server system is limited by the scale and cost of the processor, and is difficult to increase by a larger amount, so that an additional interface expansion needs to be performed through a local expansion switch chip.

In a scenario where a server is widely applied to cloud computing today, PCIe devices (e.g., GPUs) are often needed by many applications, and when a PCIe device mounted on a server host is not used by the server, it is difficult to quickly and conveniently switch to another server with a use requirement for use, which results in very high operation and maintenance costs. Therefore, how to realize the remote node-crossing PCIe interconnection expansion, realize the dynamic switching of the PCIe devices, save the operation and maintenance cost, and improve the utilization rate of the PCIe devices is a problem that needs to be solved nowadays.

Disclosure of Invention

The invention aims to provide a PCIe communication device and a BMC (baseboard management controller) to realize remote cross-node PCIe interconnection expansion, realize dynamic switching of PCIe equipment, save operation and maintenance cost and improve the utilization rate of the PCIe equipment.

To solve the above technical problem, the present invention provides a PCIe communication apparatus, including:

the primary upstream interface unit is used for being connected with a local host;

the secondary upstream interface unit is used for connecting with a remote host;

the downstream interface unit is used for being connected with the PCIe equipment through a communication interface;

and the switching matrix unit is used for forwarding PCIe communication messages between the primary upstream interface unit and the corresponding downstream interface unit and/or PCIe communication messages between the secondary upstream interface unit and the corresponding downstream interface unit.

Optionally, the communication interface includes a remote interface and a local interface.

Optionally, the remote interface is specifically a remote high-speed optical interface.

Optionally, the switch matrix unit is specifically configured to forward, by using a link configuration information table, PCIe communication packets sent by the primary upstream interface unit and/or the secondary upstream interface unit to respective corresponding downstream interface units, and forward PCIe communication packets sent by each of the downstream interface units to respective corresponding primary upstream interface units or any secondary upstream interface unit.

Optionally, the apparatus further comprises:

the management and control unit is used for configuring a PCIe communication link between each target PCIe device and the local host or any target remote host so as to finish the binding of the target PCIe device and the corresponding local host or any target remote host; each target PCIe device is one PCIe device connected with any downstream interface unit, and each target remote host is one remote host connected with any secondary upstream interface unit.

Optionally, the management and control unit is specifically configured to configure one remote host corresponding to each secondary upstream interface unit, one PCIe device corresponding to each downstream interface unit, and a primary upstream interface unit or one secondary upstream interface unit corresponding to each downstream interface unit.

Optionally, the current downstream interface unit is specifically configured to send an interrupt request corresponding to a PCIe device hot plug to the local host when the current downstream interface unit is configured to correspond to the primary upstream interface unit, so as to control the local host to drive and load the current PCIe device; the current downstream interface unit is any downstream interface unit, and the current PCIe device is a PCIe device corresponding to the current downstream interface unit.

Optionally, the current downstream interface unit is further configured to send, to the local host, an interrupt request corresponding to hot-unplugging of the PCIe device according to the configuration unbinding instruction of the management and control unit after the local host driver loads the current PCIe device, so as to control the local host to unbind the current PCIe device.

Optionally, the management and control unit is specifically configured to configure the PCIe communication link according to a configuration instruction sent by an out-of-band management system of the BMC.

In addition, the present invention also provides a BMC, comprising: a PCIe communications device as described above.

The invention provides a PCIe communication device, comprising: the primary upstream interface unit is used for being connected with a local host; the secondary upstream interface unit is used for connecting with a remote host; the downstream interface unit is used for being connected with the PCIe equipment through a communication interface; the switching matrix unit is used for forwarding PCIe communication messages between the primary upstream interface unit and the corresponding downstream interface unit and/or PCIe communication messages between the secondary upstream interface unit and the corresponding downstream interface unit;

therefore, the invention utilizes the second-level upstream interface unit to connect with the remote host, and realizes the PCIe interconnection expansion of remote cross-nodes; the PCIe communication messages between the primary upstream interface unit and/or the secondary upstream interface unit and the corresponding downstream interface unit are forwarded by using the switch matrix unit, and the PCIe communication between the PCIe equipment and the corresponding local host or remote host is realized, so that the dynamic switching of the PCIe equipment can be automatically realized by using a software system, the operation and maintenance cost is saved, and the utilization rate of the PCIe equipment is improved. In addition, the invention also provides BMC which has the beneficial effects.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a block diagram illustrating a PCIe communication device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another PCIe communication device according to the embodiment of the invention;

fig. 3 is a schematic structural diagram of a PCIe interconnect system according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a bus configuration of another PCIe communication device according to the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a block diagram of a PCIe communication device according to an embodiment of the present invention. The PCIe communication apparatus may include:

a primary upstream interface unit 10 for connecting with a local host;

a secondary upstream interface unit 20 for connection with a remote host;

a downstream interface unit 30 for connecting with a PCIe device through a communication interface 40;

the switch matrix unit 50 is configured to forward PCIe communication packets between the primary upstream interface unit 10 and the corresponding downstream interface unit 30 and/or PCIe communication packets between the secondary upstream interface unit 20 and the corresponding downstream interface unit 30.

It can be understood that the primary Upstream interface unit 10 in this embodiment may be connected to a local host (e.g., a server), as shown in fig. 2, the primary Upstream interface unit 10 (a local primary Upstream) may be connected to a PCIe root interface (host root interface) on the local host through a PCIe interface; the secondary upstream interface unit 20 may be connected to a remote host (e.g., a server) at a remote location; downstream interface unit 30 may connect with a PCIe device through communication interface 40; the switch matrix unit 50 may be connected to the first-stage upstream interface unit 10, the second-stage upstream interface unit 20, and the downstream interface unit 30, respectively, and forward PCIe communication packets between the first-stage upstream interface unit 10 and the second-stage upstream interface unit 20 and the respective corresponding downstream interface units 30 according to the configured PCIe communication link.

Specifically, the specific number of the secondary Upstream interface units 20 and the Downstream interface units 30 connected to the switch matrix unit 50 in this embodiment may be set by a designer according to a practical scenario and a user requirement, as shown in fig. 2, the number of the Downstream interface units 30 may be 32(Downstream 0-Downstream 31), and the number of the secondary Upstream interface units 20 (secondary Upstream) may be 1, so that a remote host connected to the secondary Upstream interface unit 20 may perform PCIe communication through a PCIe device connected to the corresponding Downstream interface unit 30.

The communication interface 40 in this embodiment may be an interface for implementing connection between the downstream interface unit 30 and a corresponding PCIe device, and for a specific type of the communication interface 40, the communication interface may be set by a designer according to a practical scenario and a user requirement, for example, the communication interface 40 may include a local interface, that is, the downstream interface unit 30 may be connected to a local PCIe device (that is, all PCIe devices belonging to a local host are used) through the local interface (such as a PCIe electrical interface); as shown in fig. 2, the downstream interface unit 30 may be connected to the local PCIe device through a conventional PCIe electrical interface. Communication interface 40 may also include a remote interface, i.e., downstream interface unit 30 may connect to a remote PCIe device through a remote interface (e.g., a high-speed network interface and/or a remote high-speed optical interface), thereby effectively extending the distance and rate limitations of conventional PCIe electrical interface connections. As shown in FIG. 2, communication interface 40 may include a local interface and a remote interface such that downstream interface unit 30 may connect to a local PCIe device not only through the local interface, but also through the remote interface, thereby enabling a local host to connect to PCIe devices across the remote of the node.

Correspondingly, as shown in fig. 2, the remote interface may be specifically a remote high-speed optical interface, which is used to connect to a remote PCIe device, such as a PCIe device of a remote server; because the remote high-speed optical interface is different from the traditional PCIe electrical interface, the self-defined high-speed optical interface is adopted, the limitation of distance and speed can be effectively realized when the traditional PCIe electrical interface is connected, meanwhile, the remote high-speed optical interface is also different from a high-speed network interface, more reliable and efficient transmission quality can be provided, and the requirement of PCIe communication on high bandwidth is met.

Specifically, the specific number of the local interfaces and the remote interfaces may be set by a designer according to a use scenario and a user requirement, for example, the remote interfaces may be set according to the number of remote PCIe devices that need to be configured for communication, and the local interfaces may be set according to the number of local PCIe devices that are configured for communication, which is not limited in this embodiment.

It should be noted that, the switch matrix unit 50 is specifically configured to forward, by using the link configuration information table, PCIe communication packets sent by the primary upstream interface unit 10 and/or the secondary upstream interface unit 20 to the respective corresponding downstream interface unit 30, and forward PCIe communication packets sent by each downstream interface unit 30 to the respective corresponding primary upstream interface unit 10 or any secondary upstream interface unit 20; that is, each downstream interface unit 30 may be configured to correspond to an upstream interface unit (i.e., the primary upstream interface unit 10 or any secondary upstream interface unit 20) such that a PCIe device connected to the downstream interface unit 30 can establish a PCIe communication link with a host (i.e., a local host or a remote host) to which the corresponding upstream interface unit is connected.

Correspondingly, the PCIe communication apparatus provided in this embodiment may further include a management and control unit, configured to configure a PCIe communication link between each target PCIe device and the local host or any target remote host, so as to complete the binding between the target PCIe device and the respective corresponding local host or any target remote host; each target PCIe device is a PCIe device connected to any downstream interface unit 30, and each target remote host is a remote host connected to any secondary upstream interface unit 20; for example, the management and control unit may configure the PCIe communication link between each target PCIe device and the local host or any target remote host by configuring the link configuration information table in a register.

Specifically, the policing unit may be specifically configured to configure one remote host corresponding to each secondary upstream interface unit 20, one PCIe device corresponding to each downstream interface unit 30, and one primary upstream interface unit 10 or one secondary upstream interface unit 20 corresponding to each downstream interface unit 30, so as to implement configuration of a PCIe communication link between each target PCIe device and the local host or any target remote host.

Furthermore, the PCIe communication device provided in this embodiment may be set in the BMC, so that the local host can implement PCIe interface expansion by using its own BMC, thereby avoiding the use of an additional PCIe switch chip and reducing cost consumption; correspondingly, the management and control unit may be specifically configured to configure the PCIe communication link according to a configuration instruction sent by the out-of-band management system of the BMC. The PCIe communication device may also be disposed in a PCIe switch chip connected to the local host, which is not limited in this embodiment.

Specifically, as shown in fig. 2, when the PCIe communication apparatus is disposed in the BMC, if the PCIe device connected and mounted by the downstream interface unit 30(downstream 0) is a local PCIe device, the local host may control the management and control unit to configure the routing information of the switching matrix unit 50 and the downstream0 to the local interface through the outband management system of the BMC, so that the local host and the PCIe device mounted on the local interface can complete the establishment of the communication link.

Correspondingly, as shown in fig. 2, when the local host sends a PCIe packet targeting a local PCIe device, the PCIe packet may first pass through the primary Upstream interface unit 10 (local primary Upstream), and when the primary Upstream interface unit 10 recognizes that the packet route is a downstream device, the PCIe packet is sent to the switch matrix unit 50, and the routing information (for example, destination PCIe device information) is marked; the switch matrix unit 50 may know that the PCIe packet is downlink 0 (i.e., the Downstream interface unit 30) according to the link configuration information table, and send the PCIe packet to downlink 0 through the switch; after the lower downlink 0 receives the PCIe message, it can be known that the PCIe message is destined for the PCIe device of the local interface according to the configuration information, and the lower downlink 0 may forward the PCIe message to the local interface, and send the PCIe message to the locally mounted PCIe device through the local interface.

Correspondingly, as shown in fig. 2, when the local PCIe device sends a PCIe packet to the local host, the local interface sends the PCIe packet to a corresponding Downstream interface unit 0 (i.e., the Downstream interface unit 30), and the Downstream interface unit 0 forwards the PCIe packet to the switch matrix unit 50, and marks routing information; the switch matrix unit 50 can know that the PCIe packet is sent to the first level Upstream interface unit 10 (the local first level Upstream) and then sent to the PCIe root interface of the local host through the first level Upstream interface unit 10 according to the link configuration information table.

It is understood that the PCIe device connected to the downstream interface unit 30 in this embodiment can be provided not only to the local host but also to the remote host. As shown in fig. 3, when the s0.card (i.e., PCIe device) is used for the Server 0 (i.e., local host), the local s0.card may perform PCIe communication with the Server 0 through the s1.d2 (i.e., downstream interface unit 30), the s0.sw (i.e., switch matrix unit 50), and the s0.u1 (i.e., primary upstream interface unit 10) as shown in the PCIe path building and communication process described above. When the S0.card needs to be used by the Server 1 (namely, a remote host), a PCIe communication link from the Server 1 to the S0.card needs to be configured and constructed; when the Server 1 sends a PCIe message to the S0.card, firstly, the PCIe message is sent to the S2.SW (namely, the switching matrix unit 50 of the Server 1) through the S1.U1 (namely, the primary upstream interface unit 10 of the Server 1), and the route is marked; s2.SW sends the message to corresponding S1.D1 (namely downstream interface unit 30 of Server 1) according to the configuration information, S1.D1 identifies the route as PCIe message to be sent to remote according to the configuration information, S1.D1 forwards the message to S0.U2 (namely secondary upstream interface unit 20 of Server 0) through the remote interface, S0.U2 forwards the message to S0.SW, the essential routing information of S0.SW forwards the message to corresponding S0.D2, and S0.D2 forwards the message to S0.Card through the local interface according to the configuration information and the routing information. The process of sending the PCIe packet to the Server 1 by the s0.card is similar to the above process, and the same path is adopted, and the PCIe packet is sent to the Server 1 in the reverse direction, which is not limited in this embodiment. Similarly, in a similar manner to the above process, s1.card may also be provided to the Server 0 for use, and this embodiment is not limited in any way.

Correspondingly, on the PCIe communication path of the above s0.card and Server 1, s1.u1, s1.sw, s1.d1, s0.u2, s0.sw, and s0.d2 together form a PCIe bridge device, where s1.u1 is presented as an upstream port of the bridge device, s1.d1 is presented as a downstream port of the bridge device, and the following s0.u2, s0.sw, and s0.d2 are presented together in a form configured as a transmission path according to the system.

It should be noted that, for a PCIe interconnect system composed of a plurality of hosts, such as the interconnect PCIe system of two hosts shown in fig. 3, in practical application, if the number of the downstream interface units 30 in each host is 32, the PCIe interconnect system composed of up to 32 hosts may be formed, and the downstream interface unit 30 of each host mounts PCIe devices, which may be provided to any host in the system according to configuration requirements for use. When the multi-host system is initialized, each host may be used as a local host, and a PCIe root (root) device may traverse a condition that a PCIe device is mounted on the downstream interface unit 30. When the host initiates a PCIe traversal request, the primary upstream interface unit 10 responds to the host request, and is configured by the host such that the primary bus number may be 0 and the secondary bus number may be 1; each downstream interface unit 30 responds to the local host request, and is configured by the host as a primary bus number of 1 and a secondary bus number of 2-33 (respectively corresponding to 32 downstream interface units 30); as the host continues to traverse underneath the various downstream interface units 30, the downstream ports can reply that the host does not have any devices mounted.

Correspondingly, according to the PCIe traversal result of initializing the local host as described above, as shown in fig. 4, the PCIe structure that can be seen by each host is 32 level 2 bus bridges mounted below one level 1 bus bridge, and no device is mounted below each level 2 bridge device. The initialization is designed by adopting the process, any equipment is not mounted for the dynamic flexible loading requirement of the PCIe equipment, and after the initialization is completed, each actually existing PCIe equipment can be flexibly mounted into a PCIe bus system under the appointed host according to the configuration requirement, and the PCIe equipment and the appointed host are bound.

Correspondingly, after initialization of each host is completed, configuration and distribution of PCIe devices used by each host can be performed through system management and control, so that each host can recognize the PCIe devices mounted below the PCIe bus system of the host, and binding of the PCIe devices and the corresponding host is completed.

As shown in fig. 3, if s0.card is configured to be used by Server 0, after configuration is completed, first, s0.d2 may simulate the behavior of s0.card, and send an interrupt request to Server 0, after Server 0 receives the interrupt request, query the bridge configuration space of s0.d2, discover that there is a device on the downstream bus of the bridge device, continue to send PCIe query to access the downstream configuration space of s0.card device, discover that s0.card device, read device attributes, load a driver, and complete binding of PCIe device of s0.card to Server 0. Thereafter, the application of Server 0 can normally access and use s0.card through the host driver and PCIe communication link.

Correspondingly, as shown in fig. 3, if the s0.card is configured to be used by the Server 1, after the configuration is completed, the s1.d1 may simulate the behavior of the s0.card, send an interrupt request to the Server 1, after the Server 1 receives the interrupt request, query the bridge configuration space of the s1.d2, find that there is a device on the downstream bus of the bridge device, continue to send the PCIe query, access the configuration space of the s0.card device through the paths of s0.u2, s0.sw, S0 and D1, find the s0.card device, read the device attribute, load the driver, and complete the binding of the PCIe device of the s0.card with the Server 1.

That is, the current downstream interface unit 30 may specifically be configured to, when configured to correspond to the primary upstream interface unit 10, send an interrupt request corresponding to the PCIe device hot plug to the local host, so as to control the local host to drive and load the current PCIe device; the current downstream interface unit 30 is any downstream interface unit 30, and the current PCIe device is a PCIe device (e.g., a local PCIe device or a remote PCIe device) corresponding to the current downstream interface unit 30.

Correspondingly, when the PCIe device is bound to a host and is expected to be used by another host after the PCIe device is bound to the host, the PCIe device can be quickly offloaded from one host to another host through remote configuration of the out-of-band management system in this embodiment.

As shown in fig. 3, when the s0.card is initially bound under the bus of the Server 0 (i.e. the local host), after the use is completed, the Server 0 sends the use completion information to the out-of-band management system, the out-of-band management system sends the configuration command to the corresponding configuration unit, the configuration unit sends the configuration unbinding instruction to the s0.d2, controls the s0.d2 to simulate the s0.card hot-plug operation, sends the corresponding interrupt request to the Server 0, and after the Server 0 queries and reconfigures the bridge configuration space of the s0.d2 according to the protocol standard flow of PCIe hot-plug, the unbinding operation between the s0.card and the Server 0 host is completed. After the operation is completed, s0.card is hoped to be bound under the bus of Server 1 and used by Server 1, then the binding of Server 1 and s0.card is completed according to the above binding operation flow which can be installed and reinstalled under the bus of Server 1.

That is to say, the current downstream interface unit 30 may also be configured to send, according to the configuration unbinding instruction of the management and control unit, a corresponding interrupt request for hot-unplugging the PCIe device to the local host, after the local host driver loads the current PCIe device, so as to control the local host to unbind the current PCIe device.

In this embodiment, the second-level upstream interface unit 20 is connected to a remote host to implement PCIe interconnection expansion of remote cross-nodes; the switching matrix unit 50 is used for forwarding the PCIe communication packet between the primary upstream interface unit 10 and/or the secondary upstream interface unit 20 and the corresponding downstream interface unit 30, so as to implement PCIe communication between the PCIe device and the corresponding local host or remote host, thereby automatically implementing dynamic switching of the PCIe device by using a software system, saving operation and maintenance cost, and improving the utilization rate of the PCIe device.

Corresponding to the above device embodiments, embodiments of the present invention further provide a BMC, and a BMC described below and a PCIe communication device described above may be referred to correspondingly.

The embodiment of the invention provides a BMC, which comprises: a PCIe communication device as provided in the above embodiments.

The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the BMC disclosed in the embodiment, since it corresponds to the apparatus disclosed in the embodiment, the description is simple, and the relevant points can be referred to the description of the method section.

The PCIe communication device and the BMC provided in the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.