WO2015096548A1 - Procédé de commande de flux basée sur une priorité (pfc), dispositif de transmission et dispositif de réception - Google Patents

Procédé de commande de flux basée sur une priorité (pfc), dispositif de transmission et dispositif de réception Download PDF

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Publication number
WO2015096548A1
WO2015096548A1 PCT/CN2014/089645 CN2014089645W WO2015096548A1 WO 2015096548 A1 WO2015096548 A1 WO 2015096548A1 CN 2014089645 W CN2014089645 W CN 2014089645W WO 2015096548 A1 WO2015096548 A1 WO 2015096548A1
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Prior art keywords
receiving device
priority
receiving
virtual channel
sending
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PCT/CN2014/089645
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English (en)
Chinese (zh)
Inventor
吴明杰
彭本华
方洪灿
吴沛
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华为技术有限公司
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Publication of WO2015096548A1 publication Critical patent/WO2015096548A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a priority-based flow control PFC method, a transmitting device, and a receiving device.
  • the receiving buffer of different devices is different, and the data transmitting device needs to be full according to the receiving buffer of the data receiving device.
  • the status is flow controlled.
  • the back pressure of a data receiving end device will cause the communication between other data receiving end devices and the data transmitting end device to be interrupted at the same time.
  • PFC Priority-Based Flow Control
  • PFC technology allows up to 8 virtual channels to be created on an Ethernet link and assigns an IEEE 802.1P priority to each virtual channel, allowing any one of the virtual channels to be paused and restarted without affecting other virtual channels. flow. PFC technology allows network administrators to use some of these priorities (usually up to 8) for upper packet protocols that are sensitive to packet loss, while others are used for regular Ethernet services.
  • the existing PFC technology is based on flow control between different service types, and the virtual channel has a corresponding relationship with the service type, and only controls data transmission and reception according to different service types.
  • This type of flow control technology uses a virtual channel corresponding to the type of service. Therefore, when a certain service channel of a data receiving device is back pressured, the virtual channel of this service type will be blocked, and eventually another data receiving device cannot process this type of service normally.
  • the technical problem to be solved by the present invention is that in a traffic control scenario in which multiple I/Os are shared by multiple servers, how to implement data in the receiving buffer space of a certain receiving device will be full back pressure, Affects the data transmission of other receiving devices and transmitting devices.
  • the present invention provides a priority-based flow control PFC method, which is applied to a traffic control scenario in which at least two servers share at least two virtual channels in an Ethernet, the at least two The server includes at least one transmitting device and at least one receiving device, and the PFC method includes:
  • the sending device searches for a priority of the corresponding first virtual channel and the receiving device in a first correspondence that is preset in the sending device according to the identifier of the receiving device, where the first correspondence includes the Determining a priority of the receiving device, a relationship between the identifier of the receiving device, and the first virtual channel, where the first virtual channel is the receiving device receiving data from the sending device on an Ethernet link Channels in which the identifiers of different receiving devices are different, and the identifiers of the receiving devices have a one-to-one correspondence with the first virtual channel;
  • the sending device sends a packet to the receiving device by using the first virtual channel that is found, where the packet includes a priority of the receiving device and data sent by the sending device to the receiving device.
  • the sending device searches for a corresponding first virtual channel and a first corresponding relationship that is preset in the sending device according to the identifier of the receiving device.
  • the priority of the receiving device, the first correspondence includes the priority of the receiving device, the identifier of the receiving device, and the corresponding relationship between the first virtual channel, including:
  • the sending device searches for the priority of the corresponding first virtual channel and the receiving device in the first correspondence relationship preset in the sending device, according to the identifier and the service type of the receiving device,
  • the first correspondence relationship includes the service type, the priority of the receiving device, the identifier of the receiving device, and a correspondence between the first virtual channels.
  • the sending device is preset in the sending device according to the identifier of the receiving device before searching for the priority of the corresponding first virtual channel and the receiving device in the first correspondence, the method includes:
  • the first correspondence is preset in the sending device, where the first correspondence includes a priority of the receiving device, an identifier of the receiving device, and a correspondence between the first virtual channel; or ,
  • the first correspondence includes the service type, the priority of the receiving device, the identifier of the receiving device, and a correspondence between the first virtual channels.
  • the sending device The first virtual channel that is found is sent to the receiving device, and includes:
  • the sending device generates a virtual local area network (VLAN) VLAN frame, wherein a priority field of the VLAN frame is written by the sending device to a priority of the received receiving device, where the VLAN frame is
  • the payload includes data sent by the sending device to the receiving device;
  • VLAN virtual local area network
  • the sending device sends a report to the receiving device by using the first virtual channel that is found by the sending device After the article, including:
  • the transmitting device receives the pause OFF frame from the receiving device, suspending communication with the receiving device according to the pause time in the OFF frame;
  • the OFF frame is generated by the receiving device in a state that a receiving buffer space occupied by the received data is higher than an upper threshold, or data received by the receiving device in the service type. Generated when the occupied receive buffer space is higher than the upper threshold.
  • the method includes:
  • the ON frame is generated by the receiving device in a state that a receiving buffer space occupied by the received data is lower than a lower threshold, or data received by the receiving device in the service type. Generated when the occupied receive buffer space is lower than the lower threshold.
  • the present invention provides a priority-based flow control PFC method, applicable to a traffic control scenario in which at least two servers share at least two virtual channels in an Ethernet, the at least two servers including at least one sending a device and at least one receiving device, the PFC method comprising:
  • the receiving device receives a packet from the sending device by using a first virtual channel, where the packet includes a priority of the receiving device and data sent by the sending device to the receiving device, where the first a virtual channel is connected to the receiving device from the sending device on an Ethernet link a priority of the receiving device, where the priority of the receiving device is a priority that is found by the sending device in a preset first correspondence, the first correspondence includes a priority of the receiving device, and the receiving Corresponding relationship between the identifier of the device and the first virtual channel, where the identifiers of the different receiving devices are different, and the identifier of the receiving device has a one-to-one correspondence with the first virtual channel.
  • the method before the receiving device receives the packet from the sending device by using the first virtual channel, the method includes:
  • the second correspondence includes a service type, a priority of the sending device, an identifier of the sending device, and a correspondence between the second virtual channels.
  • the second corresponding relationship further includes a priority of the receiving device.
  • the receiving device a virtual channel, receiving a message from the sending device, including:
  • the receiving device receives a virtual local area network (VLAN) VLAN frame from the sending device by using the first virtual channel, where a priority field of the VLAN frame is written by the sending device to a priority of the received receiving device
  • the payload of the VLAN frame includes data sent by the sending device to the receiving device.
  • VLAN virtual local area network
  • the receiving device by using the first virtual channel, receives a packet from the sending device After that, include:
  • the OFF frame is generated by the receiving device in a state that a receiving buffer space occupied by the received data is higher than an upper threshold, or data received by the receiving device in the service type. Generated when the occupied receive buffer space is higher than the upper threshold.
  • the method includes:
  • the ON frame is generated by the receiving device in a state that a receiving buffer space occupied by the received data is lower than a lower threshold, or data received by the receiving device in the service type. Generated when the occupied receive buffer space is lower than the lower threshold.
  • the present invention provides a sending device, which is applied to a traffic control scenario in which at least two servers share at least two virtual channels in an Ethernet, including:
  • a locating module configured to search for a priority of the corresponding first virtual channel and the receiving device in a first correspondence that is preset in the sending device according to the identifier of the receiving device, where the first corresponding relationship includes the receiving device a priority of the priority, the identifier of the receiving device, and a correspondence between the first virtual channel, where the first virtual channel is a channel for the receiving device to receive data from the sending device on an Ethernet link,
  • the identifiers of the different receiving devices are different, and the identifiers of the receiving devices have a one-to-one correspondence with the first virtual channel.
  • a sending module configured to connect to the searching module, to send a packet to the receiving device by using the first virtual channel that is found, where the packet includes a priority of the receiving device and the The data transmitted by the transmitting device to the receiving device.
  • the searching module is further configured to: preset, in the sending device, according to an identifier and a service type of the receiving device Searching, in the first correspondence, the priority of the corresponding first virtual channel and the receiving device, where the first correspondence includes the service type, the priority of the receiving device, the identifier of the receiving device, and Corresponding relationship between the first virtual channels.
  • the method further includes:
  • the establishing module is further configured to establish, on the Ethernet link, an identifier of the receiving device and the first virtual channel corresponding to the service type;
  • a configuration module configured to be connected to the establishing module, configured to preset the first correspondence in the sending device, where the first correspondence includes a priority of the receiving device, an identifier of the receiving device, and a location Corresponding relationship between the first virtual channels;
  • the configuration module is further configured to pre-set the first correspondence in the sending device, where the first correspondence includes the service type, a priority of the receiving device, and an identifier of the receiving device. Correspondence relationship with the first virtual channel.
  • the sending module includes:
  • a generating unit configured to generate a virtual local area network (VLAN) VLAN frame, wherein a priority field of the VLAN frame is written by the sending device to a priority of the received receiving device, where a payload of the VLAN frame includes the sending Data sent by the device to the receiving device;
  • VLAN virtual local area network
  • the import unit is connected to the generating unit, and configured to send the VLAN frame to the receiving device by using the first virtual channel that is found.
  • the method further includes:
  • a processing module connected to the sending module, is configured to suspend communication with the receiving device according to a pause time in the OFF frame if a paused OFF frame is received from the receiving device;
  • the OFF frame is generated by the receiving device in a state that a receiving buffer space occupied by the received data is higher than an upper threshold, or data received by the receiving device in the service type. Generated when the occupied receive buffer space is higher than the upper threshold.
  • the processing module is further configured to: if the pause time in the OFF frame is reached or from the Receiving, by the receiving device, a communication ON frame, resuming communication with the receiving device;
  • the ON frame is generated by the receiving device in a state that a receiving buffer space occupied by the received data is lower than a lower threshold, or data received by the receiving device in the service type. Generated when the occupied receive buffer space is lower than the lower threshold.
  • the present invention provides a receiving device, which is applied to a traffic control scenario in which at least two servers share at least two virtual channels in an Ethernet, including:
  • a receiving module configured to receive, by using a first virtual channel, a packet from a sending device, where the packet includes a priority of the receiving device and data sent by the sending device to the receiving device, where the first virtual
  • the channel is a channel for the receiving device to receive data from the sending device on the Ethernet link, and the priority of the receiving device is a priority that the sending device finds in the preset first correspondence relationship.
  • the first correspondence includes the priority of the receiving device, the identifier of the receiving device, and the correspondence between the first virtual channels, where different receiving devices have different identifiers, and the identifiers of the receiving devices are
  • the first virtual channel has a one-to-one correspondence.
  • the method further includes:
  • the establishing module is further configured to establish, on the Ethernet link, an identifier of the sending device and a second virtual channel corresponding to the service type;
  • a configuration module configured to be connected to the establishing module, configured to pre-set a second correspondence in the receiving device, where the second correspondence includes a priority of the sending device, and the sending device Correspondence between the identifier and the second virtual channel;
  • the configuration module is further configured to pre-set a second correspondence in the receiving device in the receiving device, where the second correspondence includes a service type, a priority of the sending device, and the sending device Correspondence between the identifier and the second virtual channel.
  • the second corresponding relationship further includes a priority of the receiving device.
  • the receiving module is further configured to pass the first virtual channel
  • the sending device receives the virtual local area network (VLAN) VLAN frame, wherein the priority field of the VLAN frame is written by the sending device to the priority of the received receiving device, and the payload of the VLAN frame includes the sending device The data sent by the receiving device.
  • VLAN virtual local area network
  • the method further includes:
  • a sending module configured to be connected to the receiving module, configured to send, by using the second virtual channel, a pause OFF frame to the sending device, where a priority field of the OFF frame is written by the receiving device into the VLAN frame.
  • the OFF frame is generated by the receiving device in a state that a receiving buffer space occupied by the received data is higher than an upper threshold, or data received by the receiving device in the service type. Generated when the occupied receive buffer space is higher than the upper threshold.
  • the sending module is further configured to send, by using the second virtual channel, the sending device Connecting an ON frame, the priority field of the ON frame being written by the receiving device, the priority acquired from the VLAN frame or the priority of the receiving device found in the second correspondence,
  • the ON frame is generated by the receiving device in a state that a receiving buffer space occupied by the received data is lower than a lower threshold, or data received by the receiving device in the service type. Generated when the occupied receive buffer space is lower than the lower threshold.
  • the receiving devices by configuring a correspondence between the priority, the first virtual channel, and the receiving device identifier in the sending device, different receiving devices can receive data from the sending device by using different first virtual channels, and the receiving device appears.
  • the back pressure or communication it is only necessary to stop the receiving device from receiving data from the transmitting device through its corresponding first virtual channel without affecting data transmission of other receiving devices and the transmitting device.
  • FIG. 1 is a flowchart showing a priority-based flow control PFC method according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart showing a priority-based flow control PFC method according to Embodiment 2 of the present invention
  • FIG. 3 is a flowchart showing a priority-based flow control PFC method according to Embodiment 3 of the present invention.
  • FIG. 4 is a flowchart showing a priority-based flow control PFC method according to Embodiment 4 of the present invention.
  • FIG. 5a is a structural block diagram of a transmitting device according to Embodiment 5 of the present invention.
  • Figure 5b is a block diagram showing the structure of a transmitting device according to Embodiment 5 of the present invention.
  • FIG. 6 is a block diagram showing the structure of a transmitting apparatus according to Embodiment 6 of the present invention.
  • Figure 7a is a block diagram showing the structure of a receiving device according to Embodiment 7 of the present invention.
  • Figure 7b is a block diagram showing the structure of a receiving device according to Embodiment 7 of the present invention.
  • FIG. 8 is a block diagram showing the structure of a receiving apparatus according to Embodiment 8 of the present invention.
  • FIG. 9 is a block diagram showing the structure of a priority-based flow control PFC device according to Embodiment 9 of the present invention.
  • FIG. 1 is a flow chart showing a priority-based flow control PFC method according to a first embodiment of the present invention. As shown in FIG. 1 , it may be applied to a traffic control scenario in which at least two servers share at least two virtual channels in an Ethernet, where the at least two servers may include at least one sending device and at least one receiving device, and at least two virtual devices.
  • the channel may include a channel for data transmission between different transmitting devices and different receiving devices.
  • the PFC method can mainly include:
  • Step S100 The sending device is in the sending device according to the identifier of the receiving device. Finding a priority of the corresponding first virtual channel and the receiving device, where the first correspondence includes a priority of the receiving device, an identifier of the receiving device, and the first Corresponding relationship between a virtual channel, the first virtual channel is a channel for the receiving device to receive data from the sending device on an Ethernet link; wherein different receiving devices have different identifiers, and the receiving device The identifier has a one-to-one correspondence with the first virtual channel.
  • each receiving device may be configured by the network administrator to configure a unique identifier, and the sending device may uniquely determine the receiving device by using the identifier.
  • different sending devices and different receiving devices can receive the configuration of their priorities by the network administrator, and the priority of each transmitting device or each receiving device is unique among all transmitting devices or receiving devices. For example, in a traffic control scenario where at least two servers share at least two virtual channels in an Ethernet network, including two sending devices (such as HOST_0, HOST_1), their priorities can be set to 0, 1 by the network administrator respectively. 2 receiving devices (such as IO_0, IO_1), their priority can also be set to 0, 1 by the network administrator.
  • the sending device can receive the configuration of the network administrator, that is, set the one-to-one correspondence between the receiving device and the first virtual channel in the sending device, and different channels can respectively be used to transmit data to different receiving devices, and the number of channels.
  • the data can be established on the sending device side, respectively, for sending to IO_0 and IO_1, respectively.
  • the sending device may search for the priority of the corresponding first virtual channel and the receiving device in the first correspondence configured by the network administrator, and the sending device sends data to the receiving device, for example, IO_0.
  • the priority is 0, corresponding to the first virtual channel 0, HOST_0 can send data to IO_0 through the first virtual channel 0.
  • Step S120 The sending device sends a packet to the receiving device by using the first virtual channel that is found, where the packet includes the priority of the receiving device and the sending device. Data sent to the receiving device.
  • the sending device can communicate with the receiving device by using the first virtual channel corresponding to the receiving device, that is, the sending device can send the packet to the receiving device by using the first virtual channel.
  • the priority of the receiving device found in step S100 may be written in the priority field of the packet, and the data sent by the sending device to the receiving device may be included in the payload of the packet.
  • the receiving device may return a response to the sending device according to the data empty state of the receiving buffer space. If the data received by the receiving device is full and the data cannot be continuously received, the receiving device may perform backpressure according to the flow control technology, that is, the sending device does not continue to use the first virtual channel corresponding to the identifier of the receiving device.
  • the receiving device sends data.
  • the identifiers of the receiving devices are in a one-to-one correspondence with the first virtual channel. Therefore, the back pressure of the receiving device does not affect the sending device and other receiving devices in the Ethernet through other receiving devices.
  • the first virtual channel corresponding to the identifier is communicated.
  • the data of the IO_0 receiving buffer space is full, and the voltage can be reversed to HOST_0.
  • HOST_0 can suspend communication with IO_0 through the first virtual channel 0, but HOST_0 can still be IO_1 communicates through the first virtual channel 1.
  • the PFC method may further include:
  • Step S1001 Establish a first virtual channel corresponding to the identifier of the receiving device on the Ethernet link.
  • Step S1002 A first correspondence is preset in the sending device, where the first correspondence includes a priority of the receiving device, an identifier of the receiving device, and a correspondence between the first virtual channels.
  • the first virtual channel (such as the first virtual channel 0 and the first virtual channel) Channel 1), combining the priorities of the two receiving devices, the network administrator can set the priority of the receiving device, the identifier of the receiving device, and the first correspondence between the first virtual channels, for example, the priority of IO_0 is 0. , corresponding to the first virtual channel 0.
  • the first correspondence may be used to subsequently determine the priority of a certain receiving device and the first virtual channel that sends data to the receiving device.
  • step S120 may further include:
  • Step S140 The sending device generates a virtual local area network (VLAN) VLAN frame, where the priority field of the VLAN frame is written by the sending device to the priority of the received receiving device, and the payload of the VLAN frame includes the Decoding data sent by the sending device to the receiving device;
  • VLAN virtual local area network
  • Step S160 The sending device sends the VLAN frame to the receiving device by using the first virtual channel that is found.
  • the sending device may first find the priority of the receiving device by searching for the first correspondence, and write the priority of the receiving device in the corresponding priority field of the VLAN frame of the virtual local area network.
  • the level may include data sent by the sending device to the receiving device in the payload of the VLAN frame. For example, when HOST_0 needs to send data to IO_0, HOST_0 can find the priority of IO_0 by 0 by looking up the first correspondence, corresponding to the first virtual channel 0, HOST_0 can write 0 in the priority field of the VLAN frame, and will need The transmitted data is written to the payload of the VLAN frame and the VLAN frame is sent to IO_0 through the first virtual channel 0.
  • the PFC method may further include:
  • Step S170 If the transmitting device receives the pause OFF frame from the receiving device, suspend communication with the receiving device according to the pause time in the OFF frame; wherein the OFF frame is received by the receiving device The device is generated in a state where the received buffer space occupied by the received data is higher than the upper threshold.
  • the receiving device may return a corresponding response to the sending device according to the data empty state in the receiving buffer space. If the space occupied by the data in the receiving buffer space of the receiving device is higher than the upper threshold, the receiving device may Sending an OFF frame to the sending device, instructing the sending device to suspend communication with the receiving device according to the pause time in the OFF frame, and when the pause time is reached, the transmitting device can automatically resume communication with the receiving device.
  • the pause time may be determined by the content in the pause time field in the OFF frame.
  • the sending device may stop scheduling the first virtual channel corresponding to the receiving device to suspend communication with the receiving device.
  • IO_0 can send an OFF frame to HOST_0.
  • HOST_0 stops the first virtual channel corresponding to IO_0 according to the pause time in the OFF frame. Dispatch, suspend communication with IO_0.
  • the upper threshold is a maximum amount of data that can be stored in the receiving buffer space of the receiving device. Since the sending of the OFF frame from the receiving device to the sending device receiving the OFF and responding, it takes a certain time, and there may be some time during this time. The data being sent needs to be received by the receiving device, and cannot be discarded because the data is full. Therefore, the amount of data that the receiving device can receive can be greater than the upper threshold, that is, the storage space needs to have a certain margin. If it is higher than the upper threshold, the data will be full and the receiving device will back pressure.
  • the method may further include:
  • Step S180 if the pause time in the OFF frame is reached or the transmitting device receives the connected ON frame from the receiving device, resume communication with the receiving device; wherein the ON frame is received by the receiving device
  • the device is generated in a state where the received buffer space occupied by the received data is lower than the lower threshold.
  • the sending device can automatically resume communication with the receiving device; on the other hand, after the backing device receives the back pressure, the space occupied by the data may be reduced, and when the pause time is not reached, If the receiving buffer space occupied by the data is lower than the lower threshold, the receiving device may send an ON frame to the sending device to instruct the sending device to resume communication with the receiving device. For example, if the received buffer space occupied by the data received by IO_0 is lower than the lower threshold, IO_0 can send an ON frame to HOST_0. After receiving the ON frame, HOST_0 can restart the scheduling of the first virtual channel 0 corresponding to IO_0, and resume with IO_0. Communication. Lower threshold The minimum amount of data stored in the receiving buffer space of the receiving device is lower than the lower threshold, indicating that the receiving buffer space of the receiving device is about to have no data, and the transmitting device can continue to send data to it.
  • the sending device may also serve as a receiving end, and receive data from other devices through corresponding channels according to the corresponding relationship between the channel and the device preset by the network administrator.
  • the priority-based flow control PFC method of the embodiment by establishing a first correspondence relationship in the sending device, different receiving devices can communicate with the sending device by using different first virtual channels, and a receiving device data is full.
  • the back pressure or the communication is abnormal, it is only necessary to stop the communication of the receiving device through the corresponding first virtual channel and the transmitting device, and the data transmission of the other receiving device and the transmitting device is not affected.
  • FIG. 2 is a flow chart showing a priority-based flow control PFC method according to Embodiment 2 of the present invention.
  • the steps in FIG. 2 having the same reference numerals as in FIG. 1 have the same functions, and a detailed description of these steps will be omitted for the sake of brevity.
  • the PFC method includes:
  • Step S200 The sending device searches for the priority of the corresponding first virtual channel and the receiving device in the first correspondence relationship preset in the sending device according to the identifier and the service type of the receiving device.
  • the first correspondence includes the service type, the priority of the receiving device, the identifier of the receiving device, and a correspondence between the first virtual channels.
  • the service type of the receiving device that is, the setting service type, the priority of the receiving device, the identifier of the receiving device, and the first virtual channel may also be included.
  • the service type of the receiving device that is, the setting service type, the priority of the receiving device, the identifier of the receiving device, and the first virtual channel may also be included.
  • the service type of the receiving device that is, the setting service type, the priority of the receiving device, the identifier of the receiving device, and the first virtual channel may also be included.
  • Correspondence refer to the first embodiment of the present invention.
  • the administrator establishes four first virtual channels (such as the first virtual channel 0, the first virtual channel 1, the first virtual channel 2, and the first virtual channel 3) on the sending device side, and the first virtual channel 0 and the first virtual channel 1 They are used to send data of service type 0 and service type 1 to IO_0, respectively, and the first virtual channel 2 and the first virtual channel 3 are respectively used to send data of service type 0 and service type 1 to IO_1.
  • first virtual channels such as the first virtual channel 0, the first virtual channel 1, the first virtual channel 2, and the first virtual channel 3
  • the service type 0 of the IO_0 has a priority of 0, corresponding to the first virtual channel 0, and the service type 1 of the IO_0 has a priority of 1, corresponding to the first virtual channel 1, and the service type 0 of the IO_1 has a priority of 2, corresponding to The service type 1 of the first virtual channel 2, IO_1 has a priority of 3, corresponding to the first virtual channel 3.
  • the PFC method may further include:
  • Step S2001 Establish an identifier of the receiving device and a first virtual channel corresponding to the service type on the Ethernet link.
  • a first correspondence is preset in the sending device, where the first correspondence includes the service type, the priority of the receiving device, the identifier of the receiving device, and the first virtual channel. Correspondence relationship.
  • the identifiers are set to IO_0 and IO_1 by the network administrator respectively, and each receiving device has two service types (such as service type 0 and service type 1).
  • the first virtual channel (such as the first virtual channel 0, the first virtual channel 1, the first virtual channel 2, and the first virtual channel 3) may be established on the sending device side, and the priority of each service type of the two receiving devices is combined.
  • the network administrator can configure the service type, the priority, the identifier of the receiving device, and the corresponding relationship of the first virtual channel.
  • the service type 0 of IO_0 has a priority of 0, and corresponds to the service of the first virtual channel 0, IO_0.
  • Type 1 has a priority of 1
  • the service type 0 of the IO_1 has a priority of 2
  • the service type 1 of the IO_1 has a priority of 3, corresponding to the first virtual channel 3.
  • the first correspondence may be used to subsequently determine the priority of a certain receiving device and the first virtual channel that the sending device sends data to the receiving device.
  • the receiving device may return a corresponding response to the sending device according to the data empty state of the receiving buffer space of a certain service type of the service. Specifically, if the receiving buffer space occupied by the data of the certain service type received by the receiving device is higher than the upper threshold, the receiving device may send an OFF frame to the sending device, to indicate that the sending device pauses with the receiving device during the pause time.
  • the communication of the service type is performed, but does not affect the communication between the sending device and the receiving device for other service types.
  • the receiving device may send an ON frame to the sending device to indicate that the sending device recovers and receives the receiving buffer.
  • the device performs communication for this type of service.
  • the receiving buffer space occupied by the data of the service type 0 received by IO_0 is higher than the upper threshold, IO_0 may send an OFF frame to HOST_0, and after receiving the OFF frame, HOST_0 suspends the service type 0 with the first virtual channel 0 by IO_0.
  • IO_0 can send an ON frame to HOST_0, and after receiving the ON frame, HOST_0 resumes service with IO_0 through the first virtual channel 0.
  • Type 0 communication For the upper threshold and the lower threshold, refer to the related description of the priority-based flow control PFC method in the first embodiment of the present invention.
  • the receiving device by establishing a first correspondence relationship in the sending device, different receiving devices can use different first virtual channels to communicate with different sending services of the sending device, and a certain receiving When the data of a certain service type of the device is full or the communication is abnormal, the receiving device only needs to stop the receiving device from performing communication with the sending device through the first virtual channel corresponding to the service type, without affecting the receiving device. Perform data transmission with other types of services on the sending device, and it will not affect other receiving devices and sending devices. Data transfer.
  • FIG. 3 is a flow chart showing a priority-based flow control PFC method according to Embodiment 3 of the present invention.
  • the PFC method may be applied to a traffic control scenario in which at least two servers share at least two virtual channels in an Ethernet, where the at least two servers include at least one sending device and at least one receiving device, at least two The virtual channel may include a channel for data transmission between different transmitting devices and different receiving devices.
  • the PFC method can mainly include:
  • Step S300 The receiving device receives a packet from the sending device by using a first virtual channel, where the packet includes a priority of the receiving device and data sent by the sending device to the receiving device.
  • the first virtual channel is a channel for the receiving device to receive data from the sending device on an Ethernet link, and the priority of the receiving device is found by the sending device in a preset first correspondence relationship.
  • Priority the first correspondence includes a priority of the receiving device, an identifier of the receiving device, and a correspondence between the first virtual channels.
  • each sending device or receiving device in the process of communicating between the Ethernet sending device and the receiving device, can be configured with a corresponding priority by the network administrator, and the priority of each sending device or receiving device is at all.
  • the only one of the sending device or the receiving device For example, in a traffic control scenario where at least two servers share at least two virtual channels in an Ethernet network, including two sending devices (such as HOST_0, HOST_1), their priorities can be set to 0, 1 by the network administrator respectively. 2 receiving devices (such as IO_0, IO_1), their priority can also be set to 0, 1 by the network administrator.
  • the sending device can receive the configuration of the network administrator, that is, set the one-to-one correspondence between the receiving device and the first virtual channel in the sending device, and different channels can respectively be used to transmit data to different receiving devices, and the number of channels.
  • the receiving device can pass its corresponding first virtual
  • the pseudo channel receives the message sent by the sending device, for example, IO_0 can receive the message sent by HOST_0 through the first virtual channel 0.
  • the PFC method may further include:
  • Step S3001 Establish a second virtual channel corresponding to the identifier of the sending device on the Ethernet link.
  • Step S3002 A second correspondence is preset in the receiving device, where the second correspondence includes a priority of the sending device, an identifier of the sending device, and a correspondence between the second virtual channel.
  • the second virtual channel (such as the second virtual channel 0 and the second virtual channel 1) combines the priorities of the two sending devices, and the network administrator can set the priority of the sending device, the identifier of the sending device, and the second virtual channel.
  • the second correspondence between the two for example, HOST_0 has a priority of 0, corresponding to the second virtual channel 0, for transmitting data addressed to HOST_0.
  • the second correspondence may be used to subsequently determine the priority of a certain sending device and the second virtual channel that sends data.
  • the priority of the receiving device may also be included in the second correspondence in the receiving device.
  • the identifiers are IO_0 and IO_1, respectively, and their priorities may be set to 0, 1, respectively, by the network administrator.
  • the priority of IO_0 is 0, the priority of HOST_0 is 0, and IO_0 receives the data sent by HOST_0 through the first virtual channel 0, and sends data to HOST_0 through the second virtual channel 0.
  • step S300 may further include:
  • Step S320 The receiving device receives a virtual local area network (VLAN) VLAN frame from the sending device by using the first virtual channel, where a priority field of the VLAN frame is used by the sending device Write the priority of the discovered receiving device, where the payload of the VLAN frame includes data sent by the sending device to the receiving device.
  • VLAN virtual local area network
  • the receiving device may receive the VLAN frame from the sending device by using the first virtual channel corresponding to the receiving device according to the first correspondence. For example, when IO_0 communicates with HOST_0, HOST_0 can find that the priority of IO_0 is 0 according to the first correspondence, corresponding to the first virtual channel 0, IO_0 can receive the VLAN frame through the first virtual channel 0, and HOST_0 can be in the VLAN frame. The priority field is written to 0, and the data sent to IO_0 is written to the payload of the VLAN frame.
  • the PFC method may further include:
  • Step S340 The receiving device sends a pause OFF frame to the sending device by using the second virtual channel, where a priority field of the OFF frame is written by the receiving device from a priority obtained by using the VLAN frame. Or the priority of the receiving device found in the second correspondence,
  • the OFF frame is generated by the receiving device in a state in which a receiving buffer space occupied by the received data is higher than an upper threshold.
  • the receiving device may return a corresponding response to the sending device according to the data empty state of the receiving buffer space. If the receiving buffer space occupied by the data received by the receiving device is higher than the upper threshold, the receiving device may obtain the priority of the receiving device from the received VLAN frame, or obtain the priority of the receiving device from the second correspondence. And writing the priority of the receiving device in the priority field of the OFF frame, and sending an OFF frame to the sending device by using the second virtual channel, to instruct the sending device to pause the receiving device according to the pause time in the OFF frame. Communication, when the timeout period is reached, the sending device can automatically resume communication with the receiving device. The pause time may be determined by the content in the pause time field in the OFF frame.
  • the sending device may stop scheduling the first virtual channel corresponding to the receiving device to suspend communication with the receiving device. For example, if the received buffer space occupied by the data received by IO_0 is higher than the upper threshold, IO_0 can send an OFF frame to HOST_0 through the second virtual channel 0, and HOST_0 receives After the OFF frame, communication with IO_0 is suspended according to the pause time in the OFF frame.
  • the upper threshold is a maximum amount of data that can be stored in the receiving buffer space of the receiving device. Since the sending of the OFF frame from the receiving device to the sending device receiving the OFF and responding, it takes a certain time, and there may be some time during this time.
  • the data being sent needs to be received by the receiving device and cannot be discarded because the data is full. Therefore, the amount of data that the receiving device can store can be greater than the upper threshold, that is, the storage space needs to have a certain margin. If it is higher than the upper threshold, the data will be full and the receiving device will back pressure.
  • the method may further include:
  • Step S360 The receiving device sends, by using the second virtual channel, a connected ON frame to the sending device, where a priority field of the ON frame is used by the receiving device to write a priority obtained from the VLAN frame. Or the priority of the receiving device found in the second correspondence,
  • the ON frame is generated by the receiving device in a state that the receiving buffer space occupied by the received data is lower than a lower threshold.
  • the receiving buffer space occupied by the received data may be reduced. Before the timeout period is reached, if the receiving buffer space occupied by the received data is lower than the lower threshold, the receiving device may The sending device sends an ON frame, which is used to instruct the sending device to resume communication with the receiving device. For example, the space occupied by the data of IO_0 is lower than the lower threshold, IO_0 can send the ON frame through the second virtual channel 0, and the communication with IO_0 is resumed after the HOST_0 receives the ON frame.
  • the lower threshold is the minimum amount of data stored in the receiving buffer space of the receiving device. If the threshold is lower than the lower threshold, the storage space of the receiving device is about to have no data, and the sending device can continue to send data to the receiving device.
  • the receiving device may also serve as a sending end, according to the correspondence between the identifier of the second virtual channel and the sending device and the priority in the second correspondence, to the second virtual channel by using the second virtual channel.
  • the corresponding sending device sends data.
  • the sending device can serve as a receiving end, and receive data from the receiving device through the corresponding second virtual channel.
  • FIG. 4 is a flow chart showing a priority-based flow control PFC method according to Embodiment 4 of the present invention.
  • the same steps in FIG. 4 as those in FIG. 3 have the same functions, and a detailed description of these steps will be omitted for the sake of brevity.
  • the PFC method includes:
  • Step S4001 Establish an identifier of the sending device and a second virtual channel corresponding to the service type on the Ethernet link.
  • Step S4002 a second correspondence is preset in the receiving device, where the second correspondence includes the service type, the priority of the sending device, the identifier of the sending device, and the second virtual channel. Correspondence relationship.
  • the service type of the sending device that is, the service type, the priority of the sending device, the identifier of the sending device, and the second virtual channel may also be included.
  • the identifiers are respectively set by the network administrator as HOST_0 and HOST_1, and each transmitting device can receive and receive.
  • the device performs communication between two service types (such as service type 0 and service type 1).
  • the network administrator can create four second virtual channels on the receiving device (such as the second virtual channel 0 and the second).
  • the virtual channel 1, the second virtual channel 2, and the second virtual channel 3) combine the priorities of the two sending devices, and the network administrator can configure the service type, the priority of the sending device, the identifier of the sending device, and the second virtual channel.
  • the second correspondence of the service type 0 of HOST_0 is 0, corresponding to the second virtual channel 0, the service type 1 priority of HOST_0 is 1, corresponding to the second virtual channel 1, and the service type 0 priority of HOST_1 is 2, corresponding to the second virtual channel 2, the service type 1 of HOST_1 has a priority of 3, corresponding to the second virtual channel 3.
  • the second correspondence may be used to subsequently determine the priority of a certain sending device and the second virtual channel that the receiving device sends data to the sending device.
  • the priority of the receiving device may also be included.
  • the priority-based flow control PFC method in Embodiment 3 of the present invention refers to the related description of the priority-based flow control PFC method in Embodiment 3 of the present invention.
  • the receiving device may return a corresponding response to the sending device according to the data empty state of the receiving buffer space of a certain service type of the service. Specifically, if the receiving buffer space occupied by the data of the certain service type received by the receiving device is higher than the upper threshold, the receiving device may send an OFF frame to the sending device by using the second virtual channel, to indicate that the sending device is in the pause period.
  • the communication of the service type is suspended within the receiving device, but does not affect the communication between the transmitting device and the receiving device for other service types.
  • the receiving device may send an ON frame to the sending device by using the second virtual channel to indicate the sending, when the receiving buffer space occupied by the data of the service type received by the receiving device is lower than the lower threshold.
  • the device resumes communication with the receiving device for the type of service. For example, the receiving buffer space occupied by the data of the service type 0 received by IO_0 is higher than the upper threshold, and IO_0 can send the OFF frame to HOST_0 through the second virtual channel 0, and after receiving the OFF frame, HOST_0 suspends the service type with IO_0.
  • IO_0 can send an ON frame to HOST_0 through the second virtual channel 0, and HOST_0 resumes the service with IO_0 after receiving the ON frame.
  • Type 0 communication The upper threshold and the lower threshold may be referred to in the first embodiment of the present invention based on the priority. A description of the flow control PFC method of the class.
  • the receiving device by establishing a first correspondence relationship in the sending device, different receiving devices can use different first virtual channels to communicate with different sending services of the sending device, and a certain receiving When the data of a certain service type of the device is full or the communication is abnormal, the receiving device only needs to stop the receiving device from performing communication with the sending device through the first virtual channel corresponding to the service type, without affecting the receiving device. Data transmission with other types of services by the transmitting device does not affect the data transmission of other receiving devices and transmitting devices.
  • FIG. 5a is a block diagram showing the structure of a transmitting apparatus according to Embodiment 5 of the present invention.
  • the sending device 500 can be applied to a traffic control scenario in which at least two servers in the Ethernet share at least two virtual channels, which may include:
  • the searching module 510 is configured to search for a priority of the corresponding first virtual channel and the receiving device in a first correspondence that is preset in the sending device according to the identifier of the receiving device, where the first correspondence includes the receiving a priority of the device, an identifier of the receiving device, and a correspondence between the first virtual channel, where the first virtual channel is a channel that the receiving device receives data from the sending device on an Ethernet link. .
  • each receiving device may be configured by the network administrator to configure a unique identifier, and the sending device may uniquely determine the receiving device by using the identifier.
  • different sending devices and different receiving devices can receive the configuration of their priorities by the network administrator, and the priority of each transmitting device or each receiving device is unique among all transmitting devices or receiving devices. For example, in a traffic control scenario where at least two servers share at least two virtual channels in an Ethernet network, including two sending devices (such as HOST_0, HOST_1), their priorities can be set to 0, 1 by the network administrator respectively. 2 receiving devices (such as IO_0, IO_1), their priority can also be set to 0, 1 by the network administrator.
  • the sending device can receive the configuration of the network administrator, that is, set a one-to-one correspondence between the receiving device and the first virtual channel in the sending device, and different channels can be used to transmit data to different receiving devices, respectively, and the number of channels and The number of receiving devices is the same. For example, if there are two receiving devices (such as IO_0 and IO_1), two first virtual channels (such as the first virtual channel 0 and the first virtual channel 1) can be established on the sending device through the configuration of the network administrator. Send data to IO_0 and IO_1.
  • the searching module 510 may search for the priority of the corresponding first virtual channel and the receiving device in the first corresponding relationship in the sending device 500, where the sending device 500 sends data to the receiving device, for example, HOST_0.
  • the searching module 510 may find that the priority of IO_0 is 0 in the first correspondence of HOST_0, corresponding to the first virtual channel 0, and the subsequent HOST_0 may send data to the IO_0 through the first virtual channel 0.
  • the sending module 520 is connected to the searching module 510, and configured to send a packet to the receiving device by using the first virtual channel that is found, where the packet includes the priority of the receiving device and the The data transmitted by the transmitting device to the receiving device.
  • the sending device 500 can communicate with the receiving device by using the first virtual channel corresponding to the receiving device, that is, the sending module 520 of the sending device 500 can pass the first virtual channel. Sending a message to the receiving device, and the priority of the receiving device that is found by the searching module 510 can be written in the priority field of the packet, and the sending device 500 can be included in the payload of the packet (Payload). Receive data sent by the device.
  • the receiving device may return a response to the sending device 500 according to the data empty state of the receiving buffer space. If the data received by the receiving device is full and the data cannot be continuously received, the receiving device may perform backpressure according to the flow control technology, that is, the sending device 500 does not continue to receive the first virtual channel corresponding to the receiving device. The device sends data. In this way, the back pressure of the receiving device does not affect the other receiving devices in the Ethernet and the transmitting device 500 to communicate through the first virtual channel corresponding to the other receiving devices, for example, IO_0 The data in the buffer space will be full, and it can be back pressured to HOST_0. After receiving the back pressure, HOST_0 can suspend communication with IO_0 through the first virtual channel 0, but HOST_0 can still communicate with IO_1 through the first virtual channel 1.
  • Figure 5b is a block diagram showing the structure of a transmitting apparatus according to Embodiment 5 of the present invention.
  • the sending device 500 may further include:
  • the establishing module 530 is configured to establish, on the Ethernet link, a first virtual channel corresponding to the identifier of the receiving device;
  • the configuration module 540 is connected to the establishing module 530, and configured to preset the first correspondence in the sending device, where the first correspondence includes a priority of the receiving device, an identifier of the receiving device, and a location
  • the correspondence between the first virtual channels is described.
  • the establishing module 530 can establish two first virtual channels (such as A virtual channel 0 and a first virtual channel 1), combined with the priority of the two receiving devices, the configuration module 540 can set the priority of the receiving device, the identifier of the receiving device, and the first correspondence of the first virtual channel, for example, IO_0
  • the priority is 0, corresponding to the first virtual channel 0.
  • the first correspondence may be used to subsequently determine the priority of a certain receiving device and the first virtual channel that sends data to the receiving device.
  • the sending module 520 may further include:
  • a generating unit 521 configured to generate a virtual local area network (VLAN) VLAN frame, where a priority field of the VLAN frame is written by the sending device to a priority of the received receiving device, where a payload of the VLAN frame includes the Transmitting data sent by the device to the receiving device;
  • VLAN virtual local area network
  • the importing unit 522 is connected to the generating unit 521, and configured to send the VLAN frame to the receiving device by using the first virtual channel that is found.
  • the sending device 500 when the sending device 500 sends a packet to the receiving device, the sending device may first search for the first correspondence through the searching module 510, find the priority of the receiving device, and generate the packet.
  • the unit 521 writes the priority of the receiving device in the corresponding priority field of the virtual local area network VLAN frame, and may include the data sent by the sending device to the receiving device in the payload of the VLAN frame.
  • HOST_0 when HOST_0 needs to send data to IO_0, HOST_0 can search for the first correspondence through the lookup module 510, and find that the priority of IO_0 is 0, corresponding to the first virtual channel 0, and HOST_0 can pass the priority of the VLAN frame by the generating unit 521.
  • the field is written with 0, the data to be sent is written to the payload of the VLAN frame, and the VLAN frame is sent to IO_0 through the first virtual channel 0.
  • the sending device 500 may further include:
  • the processing module 550 is connected to the sending module 520, and configured to suspend communication with the receiving device according to a pause time in the OFF frame if the sending device receives a pause OFF frame from the receiving device;
  • the OFF frame is generated by the receiving device in a state in which a receiving buffer space occupied by the received data is higher than an upper threshold.
  • the receiving device may return a corresponding response to the sending device 500 according to the data empty state in the receiving buffer space. If the space occupied by the data in the receiving buffer space of the receiving device is higher than the upper threshold, the receiving device may send an OFF frame to the sending device 500, which is used to indicate that the processing module 550 of the transmitting device 500 is based on the pause time in the OFF frame.
  • the communication with the receiving device is suspended, and when the pause time is reached, the transmitting device 500 can automatically resume communication with the receiving device.
  • the pause time may be determined by the content in the pause time field in the OFF frame.
  • the sending device may stop scheduling the first virtual channel corresponding to the receiving device to suspend communication with the receiving device. For example, if the received buffer space occupied by the data received by IO_0 is higher than the upper threshold, IO_0 can send an OFF frame to HOST_0. After receiving the OFF frame, HOST_0 stops the first virtual channel corresponding to IO_0 according to the pause time in the OFF frame. Dispatch, suspend communication with IO_0.
  • the upper threshold is a maximum amount of data that can be stored in the receiving buffer space of the receiving device. Since the receiving device sends an OFF frame to the transmitting device to receive an OFF and responds, It takes a certain amount of time.
  • the amount of data that the receiving device can receive can be greater than the upper threshold, that is, the storage space needs to be left. There is a certain amount of margin. If it is higher than the upper threshold, the data will be full and the receiving device will back pressure.
  • the processing module 550 is further configured to: resume communication with the receiving device if a pause time in the OFF frame is reached or a connected ON frame is received from the receiving device;
  • the ON frame is generated by the receiving device in a state that the receiving buffer space occupied by the received data is lower than a lower threshold.
  • the sending device 500 can automatically resume communication with the receiving device through the processing module 550; on the other hand, after the back-up device receives the data, the space occupied by the data may be reduced, in the absence of When the timeout period is reached, if the receiving buffer space occupied by the data is lower than the lower threshold, the receiving device may send an ON frame to the sending device 500 to instruct the sending device 500 to resume communication with the receiving device through the processing module 550. For example, if the received buffer space occupied by the data received by IO_0 is lower than the lower threshold, IO_0 can send an ON frame to HOST_0.
  • HOST_0 can restart the scheduling of the first virtual channel 0 corresponding to IO_0, and resume with IO_0.
  • the lower threshold is the minimum amount of data stored in the receiving buffer space of the receiving device. If the lower threshold is lower, the receiving buffer space of the receiving device is about to have no data, and the sending device 500 can continue to send data to the receiving device.
  • the sending device 500 can also serve as a receiving end, and receive data from other devices through corresponding channels according to the corresponding relationship between the channel and the device preset by the network administrator.
  • the first corresponding relationship is set in the sending device by using the configuration module, so that different receiving devices can communicate with the sending device by using different first virtual channels, and a receiving device data is full of back pressure or communication.
  • a receiving device data is full of back pressure or communication.
  • FIG. 6 is a block diagram showing the structure of a transmitting apparatus according to Embodiment 6 of the present invention.
  • the components in Fig. 6 having the same reference numerals as those in Figs. 5a and 5b have the same functions, and a detailed description of these components will be omitted for the sake of brevity.
  • the searching module 610 of the transmitting device 600 can have the function of the searching module 510 in the fifth embodiment of the present invention.
  • it can be configured as:
  • the service type 0 of IO_0 has a priority of 0, corresponding to the first virtual channel 0, and HOST_0 transmits the data of the service type 0 to the IO_0 through the first virtual channel 0.
  • the service type of the receiving device that is, the setting of the service type, the priority of the receiving device, the identifier of the receiving device, and the correspondence between the first virtual channels may also be included.
  • the service type of the receiving device that is, the setting of the service type, the priority of the receiving device, the identifier of the receiving device, and the correspondence between the first virtual channels.
  • the Ethernet includes two receiving devices (such as IO_0, IO_1), IO_0 and IO_1 respectively include two service types (such as services).
  • Type 0, service type 1 the priority of setting IO_0 service type 0 can be set to 0, the priority of IO_0 service type 1 is set to 1, the priority of IO_1 service type 0 is set to 2, and the priority of IO_1 service type 1
  • the priority is set to 3; four first virtual channels (such as the first virtual channel 0, the first virtual channel 1, the first virtual channel 2, and the first virtual channel 3) may be established on the sending device end, and the first virtual channel 0
  • the first virtual channel 1 is used to send data of service type 0 and service type 1 to IO_0, the first virtual channel 2, the first virtual
  • the quasi-channel 3 is used to send data of service type 0 and service type 1 to IO_1, respectively.
  • the service type 0 of the IO_0 has a priority of 0, corresponding to the first virtual channel 0, and the service type 1 of the IO_0 has a priority of 1, corresponding to the first virtual channel 1, and the service type 0 of the IO_1 has a priority of 2, corresponding to The service type 1 of the first virtual channel 2, IO_1 has a priority of 3, corresponding to the first virtual channel 3.
  • the establishing module 630 of the sending device 600 may be configured to: establish a function on the Ethernet link, in addition to the function of the establishing module 530 in the fifth embodiment of the present invention. Determining, by the identifier of the receiving device, a first virtual channel corresponding to the service type;
  • the configuration module 640 of the sending device 600 may be configured to: in addition to the function of the configuration module 540 in the fifth embodiment of the present invention, the first corresponding relationship is preset in the sending device, the first The correspondence includes the service type, the priority of the receiving device, the identifier of the receiving device, and a correspondence between the first virtual channels.
  • the identifiers are respectively set by the network administrator as IO_0 and IO_1, and each receiving device has two service types (such as service type 0 and service type 1).
  • the establishing module 630 can establish four first virtual channels (such as the first virtual channel 0, the first virtual channel 1, the first virtual channel 2, and the first virtual channel 3) on the sending device end, and combine the services of the two receiving devices.
  • the priority of the type, the configuration module 640 can configure the service type, the priority, the identifier of the receiving device, and the corresponding relationship of the first virtual channel. For example, the service type 0 of IO_0 has a priority of 0, corresponding to the first virtual channel 0, IO_0.
  • the service type 1 has a priority of 1, corresponding to the first virtual channel 1, and the service type 0 of the IO_1 has a priority of 2, corresponding to the first virtual channel 2, and the service type 1 of the IO_1 has a priority of 3, corresponding to the first virtual Channel 3.
  • the first correspondence may be used to subsequently determine the priority of a certain receiving device and the first virtual channel that sends data to the receiving device.
  • the receiving device may return a corresponding response to the sending device 600 according to the data empty state of the receiving buffer space of a certain service type of the service. Specifically, if The receiving buffer space occupied by the data of a certain service type received by the receiving device is higher than the upper threshold, and the receiving device may send an OFF frame to the sending device 600 to indicate that the processing module 550 of the sending device 600 pauses during the pause time. The receiving device performs communication of the service type, but does not affect the communication device and other communication types of the receiving device. Further, the receiving device may send an ON frame to the sending device 600 to indicate the processing of the sending device 600 when the receiving buffer space occupied by the data of the service type received by the receiving device is lower than the lower threshold.
  • Module 550 resumes communication with the receiving device for the type of service.
  • the receiving buffer space occupied by the data of the service type 0 received by IO_0 is higher than the upper threshold, IO_0 may send an OFF frame to HOST_0, and after receiving the OFF frame, HOST_0 suspends the service type 0 with the first virtual channel 0 by IO_0.
  • the upper threshold and the lower threshold refer to the related description of the priority-based flow control PFC method in the first embodiment of the present invention.
  • the first mapping relationship is configured in the sending device by the configuration module, so that different receiving devices use different first virtual channels to communicate with different sending services of the sending device, and a certain receiving device
  • the receiving device only needs to stop the receiving device from performing communication with the sending device through the first virtual channel corresponding to the service type, and does not affect the receiving device and the sending device.
  • Data transmission of other service types does not affect the data transmission of other receiving devices and transmitting devices.
  • Fig. 7a is a block diagram showing the structure of a receiving apparatus according to a seventh embodiment of the present invention.
  • the receiving device 700 can be applied to a traffic control scenario in which at least two servers in the Ethernet share at least two virtual channels, which may include:
  • the receiving module 710 is configured to receive, by using the first virtual channel, a packet from a sending device, where the packet includes a priority of the receiving device and data sent by the sending device to the receiving device, where the first
  • the virtual channel is a channel for the receiving device to receive data from the sending device on the Ethernet link, and the priority of the receiving device is a priority that the sending device finds in the preset first correspondence.
  • the first correspondence includes the priority of the receiving device, the identifier of the receiving device, and the correspondence between the first virtual channels.
  • the identifiers of the receiving devices are different. There is a one-to-one correspondence with the first virtual channel.
  • each sending device or receiving device in the process of communicating between the Ethernet sending device and the receiving device, can be configured with a corresponding priority by the network administrator, and the priority of each sending device or receiving device is at all.
  • the only one of the sending device or the receiving device For example, in a traffic control scenario where at least two servers share at least two virtual channels in an Ethernet network, including two sending devices (such as HOST_0, HOST_1), their priorities can be set to 0, 1 by the network administrator respectively. 2 receiving devices (such as IO_0, IO_1), their priority can also be set to 0, 1 by the network administrator.
  • the sending device can receive the configuration of the network administrator, that is, set the one-to-one correspondence between the receiving device and the first virtual channel in the sending device, and different channels can respectively be used to transmit data to different receiving devices, and the number of channels.
  • the receiving module 710 of the receiving device 700 can receive the message sent by the sending device through its corresponding first virtual channel, for example, IO_0 can receive the message sent by HOST_0 through the first virtual channel 0.
  • Figure 7b is a block diagram showing the structure of a receiving device according to Embodiment 7 of the present invention. As shown in FIG. 7b, the receiving device 700 may further include:
  • An establishing module 720 configured to establish, on the Ethernet link, an identifier corresponding to the sending device Second virtual channel
  • the configuration module 730 is connected to the establishing module 720, and configured to preset a second correspondence in the receiving device in the receiving device, where the second correspondence includes a priority of the sending device, and the Corresponding relationship between the identifier of the sending device and the second virtual channel.
  • the establishing module 720 can establish two second virtualities on the receiving device end.
  • the channel (such as the second virtual channel 0 and the second virtual channel 1), in combination with the priorities of the two sending devices, the configuration module 730 can set the priority of the sending device, the identifier of the sending device, and the second between the second virtual channel.
  • HOST_0 has a priority of 0, corresponding to the second virtual channel 0, for transmitting data addressed to HOST_0.
  • the second correspondence may be used to subsequently determine the priority of a certain sending device and the second virtual channel that sends data.
  • the priority of the receiving device 700 may also be included.
  • the identifiers are IO_0 and IO_1, respectively, and their priorities can be set to 0, 1, respectively, by the network administrator, then in the second In the correspondence, the priority of IO_0 is 0, the priority of HOST_0 is 0, and IO_0 receives the data sent by HOST_0 through the first virtual channel 0, and sends data to HOST_0 through the second virtual channel 0.
  • the receiving module 710 is further configured to: receive, by the receiving device, a virtual local area network (VLAN) VLAN frame from the sending device by using the first virtual channel, where a priority of the VLAN frame The field is written by the sending device to the priority of the found receiving device, and the payload of the VLAN frame includes data sent by the sending device to the receiving device.
  • VLAN virtual local area network
  • the receiving module 710 of the receiving device 700 may receive the VLAN frame from the sending device by using the first virtual channel corresponding to the receiving device 700 according to the first correspondence.
  • HOST_0 When HOST_0 is communicating, HOST_0 can find that the priority of IO_0 is 0 according to the first correspondence, corresponding to the first virtual channel 0, IO_0 can receive the VLAN frame through the first virtual channel 0, and HOST_0 can be in the priority field of the VLAN frame.
  • Write 0 to write the data sent to the receiving device to the payload of the VLAN frame.
  • the receiving device 700 may further include:
  • the sending module 740 is connected to the receiving module 710, and is configured to send, by the receiving device, a pause OFF frame to the sending device by using the second virtual channel, where a priority field of the OFF frame is written by the receiving device a priority obtained in the VLAN frame or a priority of the receiving device found in the second correspondence,
  • the OFF frame is generated by the receiving device in a state in which a receiving buffer space occupied by the received data is higher than an upper threshold.
  • the sending module 740 of the receiving device 700 may return a corresponding response to the sending device according to the data empty state of the receiving buffer space. If the receiving buffer space occupied by the data received by the receiving device 700 is higher than the upper threshold, the receiving device 700 may obtain the priority of the receiving device from the received VLAN frame, or obtain the receiving device 700 from the second corresponding relationship. Priority, and writing the priority of the receiving device in the priority field of the OFF frame, the sending module 740 sends an OFF frame to the sending device through the second virtual channel, to indicate that the sending device is based on the pause time in the OFF frame. The communication with the receiving device is suspended, and when the pause time is reached, the transmitting device can automatically resume communication with the receiving device.
  • the pause time may be determined by the content in the pause time field in the OFF frame.
  • the sending device may stop scheduling the first virtual channel corresponding to the receiving device to suspend communication with the receiving device. For example, if the received buffer space occupied by the data received by IO_0 is higher than the upper threshold, IO_0 can send an OFF frame to HOST_0 through the second virtual channel 0. After receiving the OFF frame, HOST_0 pauses with IO_0 according to the pause time in the OFF frame. communication.
  • the upper threshold is a maximum amount of data that can be stored in the receiving buffer space of the receiving device, and is sent from the receiving device to the transmitting device to the OFF.
  • the receiving device 700 And responding, it takes a certain time, during which time some data that is being sent needs to be received by the receiving device 700, and cannot be discarded because the data is full, so the amount of data that the receiving device 700 can store can be greater than the upper threshold. That is, the storage space needs to have a certain margin. If it is higher than the upper threshold, the data will be full and the receiving device 700 will back pressure.
  • the sending module 740 can also be configured to:
  • the ON frame is generated by the receiving device in a state that the receiving buffer space occupied by the received data is lower than a lower threshold.
  • the receiving device 700 may reduce the receiving buffer space occupied by the received data. Before the timeout period is reached, if the received buffer space occupied by the received data is lower than the lower threshold, the receiving device 700 The sending module 740 can send an ON frame to the sending device to instruct the sending device to resume communication with the receiving device. For example, the space occupied by the data of IO_0 is lower than the lower threshold, IO_0 can send the ON frame through the second virtual channel 0, and the communication with IO_0 is resumed after the HOST_0 receives the ON frame.
  • the lower threshold is the minimum amount of data stored in the receiving buffer space of the receiving device. If the threshold is lower than the lower threshold, the storage space of the receiving device 700 is about to have no data, and the sending device can continue to send data to the receiving device.
  • the receiving device 700 can also serve as a sending end, and according to the correspondence between the identifier of the second virtual channel and the sending device and the priority in the second correspondence, the sending module 740 can use the second virtual channel to The transmitting device corresponding to the second virtual channel sends data.
  • the sending device may serve as a receiving end, and receive data from the receiving device 700 through the corresponding second virtual channel.
  • the receiving device of this embodiment sets a second correspondence relationship in the receiving device by using the configuration module.
  • Different receiving devices can use different first virtual channels to communicate with the sending device.
  • the receiving device When a receiving device data is full and there is a back pressure or communication abnormality, the receiving device only needs to stop the receiving device through its corresponding first virtual channel and sending device. Communication does not affect the data transmission of other receiving devices and transmitting devices.
  • FIG. 8 is a block diagram showing the structure of a receiving apparatus according to Embodiment 8 of the present invention.
  • the components in Fig. 8 having the same reference numerals as those in Figs. 7a and 7b have the same functions, and a detailed description of these components will be omitted for the sake of brevity.
  • the establishing module 820 of the receiving device 800 can have the function of establishing the module 720 in the seventh embodiment of the present invention.
  • it can be configured as:
  • the configuration module 830 of the receiving device 800 can be configured to: in addition to the function of the configuration module 730 in the seventh embodiment of the present invention,
  • the second correspondence includes a service type, a priority of the sending device, an identifier of the sending device, and the second virtual channel Correspondence between them.
  • the service type of the receiving device that is, the service type, the priority of the sending device, the identifier of the sending device, and the second virtual channel may also be included.
  • the identifiers are respectively set by the network administrator as HOST_0 and HOST_1, and each transmitting device can receive and receive.
  • the device performs communication between two service types (such as service type 0 and service type 1), and the establishing module 820 can establish four second virtual channels (such as the second virtual channel 0 and the second virtual channel) on the receiving device end.
  • the configuration module 830 can configure the service type, the priority of the sending device, the identifier of the sending device, and the second virtual channel, in combination with the priority of the two sending devices.
  • the second correspondence for example, the service type 0 of the HOST_0 has a priority of 0, corresponding to the second virtual channel 0, the service type 1 of the HOST_0 has a priority of 1, corresponding to the second virtual channel 1, and the service type 0 of the HOST_1 has a priority of 2 Corresponding to the second virtual channel 2, the service type 1 of HOST_1 has a priority of 3, corresponding to the second virtual channel 3.
  • the second correspondence may be used to subsequently determine the priority of a certain sending device and the second virtual channel that sends data to the sending device.
  • the priority of the receiving device 800 may also be included.
  • the priority-based flow control PFC method in Embodiment 3 of the present invention refers to the related description of the priority-based flow control PFC method in Embodiment 3 of the present invention.
  • the sending module 740 of the receiving device 800 may return a corresponding response to the sending device according to the data empty state of the receiving buffer space of a certain service type of the service. Specifically, if the receiving buffer space occupied by the data of the certain service type received by the receiving device 800 is higher than the upper threshold, the sending module 740 of the receiving device 800 may send an OFF frame to the sending device by using the second virtual channel, to indicate The sending device pauses communication with the receiving device for the service type during the pause period, but does not affect the communication device and other communication type communication with the receiving device.
  • the sending module 740 of the receiving device 800 may send the ON to the sending device through the second virtual channel.
  • the receive buffer space occupied by the data of service type 0 received by IO_0 is higher than the upper threshold, IO_0 can send an OFF frame to HOST_0 through the second virtual channel 0, and HOST_0 receives the OFF frame, pauses and IO_0 passes the virtual channel 0.
  • the service type 0 communication is performed; the receiving buffer space occupied by the data of the service type 0 received at IO_0 is lower than the lower threshold, and IO_0 can send the ON frame to the HOST_0 through the second virtual channel 0, and the HOST_0 recovers after receiving the ON frame.
  • Communication with service type 0 with IO_0 on For the threshold value and the lower threshold, refer to the description of the priority-based flow control PFC method in the first embodiment of the present invention.
  • the second mapping relationship is set in the receiving device by the configuration module, so that different receiving devices use different first virtual channels to communicate with different sending services of the sending device, and a certain receiving device
  • the receiving device only needs to stop the receiving device from performing communication with the sending device through the first virtual channel corresponding to the service type, and does not affect the receiving device and the sending device. Data transmission of other service types does not affect the data transmission of other receiving devices and transmitting devices.
  • FIG. 9 is a block diagram showing the structure of a priority-based flow control PFC device according to Embodiment 9 of the present invention.
  • the PFC device 900 may be a host server having a computing capability, a personal computer PC, or a portable computer or terminal that can be carried.
  • the specific embodiments of the present invention do not limit the specific implementation of the computing node.
  • the PFC device 900 includes a processor 910, a communications interface 920, a memory 930, and a bus 940.
  • the processor 910, the communication interface 920, and the memory 930 complete communication with each other through the bus 940.
  • Communication interface 920 is for communicating with network devices, including, for example, a virtual machine management center, shared storage, and the like.
  • the processor 910 is configured to execute a program.
  • the processor 910 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.
  • ASIC Application Specific Integrated Circuit
  • the memory 930 is used to store files.
  • the memory 930 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.
  • Memory 930 can also be a memory array.
  • the memory 930 may also be partitioned, and the block may Combine into virtual volumes according to certain rules.
  • the above program may be program code including computer operating instructions.
  • the at least two servers include at least one transmitting device and at least one receiving device, and the program is specifically operable to enable the transmitting device to:
  • the identifier of the receiving device Determining, according to the identifier of the receiving device, a priority of the corresponding first virtual channel and the receiving device in a first correspondence that is preset in the sending device, where the first correspondence includes the receiving device a priority, a correspondence between the identifier of the receiving device, and the first virtual channel, where the first virtual channel is a channel that the receiving device receives data from the sending device on an Ethernet link;
  • the identifiers of the different receiving devices are different, and the identifiers of the receiving devices have a one-to-one correspondence with the first virtual channel.
  • the first virtual channel and the priority of the receiving device are searched for in the first corresponding relationship preset in the sending device according to the identifier of the receiving device, where
  • the correspondence between the priority of the receiving device, the identifier of the receiving device, and the first virtual channel includes:
  • the sending device searches for the priority of the corresponding first virtual channel and the receiving device in the first correspondence relationship preset in the sending device, according to the identifier and the service type of the receiving device,
  • the first correspondence relationship includes the service type, the priority of the receiving device, the identifier of the receiving device, and a correspondence between the first virtual channels.
  • the program is searched for the priority of the corresponding first virtual channel and the receiving device in the first corresponding relationship preset in the sending device according to the identifier of the receiving device It can also be used to enable the sending device to:
  • the first correspondence is preset in the sending device, where the first correspondence includes a priority of the receiving device, an identifier of the receiving device, and a correspondence between the first virtual channel; or
  • the first correspondence includes the service type, the priority of the receiving device, the identifier of the receiving device, and a correspondence between the first virtual channels.
  • sending, by the first virtual channel that is found, a message to the receiving device including:
  • the sending device generates a virtual local area network (VLAN) VLAN frame, wherein a priority field of the VLAN frame is written by the sending device to a priority of the received receiving device, and a payload of the VLAN frame includes the sending device Data sent to the receiving device;
  • VLAN virtual local area network
  • the program is further configured to enable the sending device to:
  • the transmitting device receives the pause OFF frame from the receiving device, suspending communication with the receiving device according to the pause time in the OFF frame;
  • the OFF frame is generated by the receiving device in a state that a receiving buffer space occupied by the received data is higher than an upper threshold, or data received by the receiving device in the service type. Generated when the occupied receive buffer space is higher than the upper threshold.
  • the program is further configured to enable the sending device to:
  • the ON frame is a receiving buffer occupied by the receiving device in the received data.
  • the at least two servers include at least one sending device and at least one receiving device, and the program specifically Can be used to enable the receiving device to:
  • the first virtual channel Receiving, by the first virtual channel, a packet from the sending device, where the packet includes a priority of the receiving device and data sent by the sending device to the receiving device, where the first virtual channel is a channel for receiving data from the sending device on the Ethernet link, where the priority of the receiving device is a priority that is found by the sending device in a preset first correspondence, the first The correspondence includes the priority of the receiving device, the identifier of the receiving device, and the correspondence between the first virtual channels, where different identifiers of the receiving devices are different, and the identifier of the receiving device is different from the first There is a one-to-one correspondence between a virtual channel.
  • the program before receiving a message from the sending device through the first virtual channel, the program is further configured to enable the receiving device to:
  • the second correspondence includes a priority of the sending device, an identifier of the sending device, and a correspondence between the second virtual channel; or
  • the second correspondence includes a service type, a priority of the sending device, an identifier of the sending device, and a correspondence between the second virtual channels.
  • the priority of the receiving device is further included in the second correspondence.
  • receiving, by the first virtual channel, a message from the sending device including:
  • VLAN virtual local area network
  • the program is further configured to enable the receiving device to:
  • the OFF frame is generated by the receiving device in a state that a receiving buffer space occupied by the received data is higher than an upper threshold, or data received by the receiving device in the service type. Generated when the occupied receive buffer space is higher than the upper threshold.
  • the program is further configured to enable the receiving device to:
  • the ON frame is generated by the receiving device in a state that a receiving buffer space occupied by the received data is lower than a lower threshold, or data received by the receiving device in the service type. Generated when the occupied receive buffer space is lower than the lower threshold.
  • the function is implemented in the form of computer software and sold or used as a stand-alone product, it is considered to some extent that all or part of the technical solution of the present invention (for example, a part contributing to the prior art) is It is embodied in the form of computer software products.
  • the computer software product is typically stored in a computer readable non-volatile storage medium, including instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all of the methods of various embodiments of the present invention. Or part of the steps.
  • the foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)
  • Communication Control (AREA)

Abstract

La présente invention concerne un procédé de commande de flux basée sur une priorité (PFC), un dispositif de transmission et un dispositif de réception, le procédé comprenant les opérations suivantes : selon l'identificateur du dispositif de réception, un dispositif de transmission recherche une première correspondance préétablie dans le dispositif de transmission pour un premier canal virtuel correspondant et la priorité du dispositif de réception ; le dispositif de transmission transmet un paquet au dispositif de réception par l'intermédiaire du premier canal virtuel recherché, le paquet comprenant la priorité du dispositif de réception et des données envoyées du dispositif de transmission au dispositif de réception. Par configuration, dans le dispositif de transmission, de la correspondance entre la priorité, le premier canal virtuel et le dispositif de réception, un mode de réalisation de la présente invention peut permettre à différents dispositifs de réception de recevoir des données à partir du dispositif de transmission à l'aide de différents premiers canaux virtuels. Lorsqu'une pression arrière ou un échec de communication se produit sur le dispositif de réception, le dispositif de réception a uniquement besoin d'arrêter de recevoir des données à partir du dispositif de réception par l'intermédiaire du premier canal virtuel correspondant au dispositif de réception, sans affecter la transmission de données entre d'autres dispositifs de réception et le dispositif de transmission.
PCT/CN2014/089645 2013-12-27 2014-10-28 Procédé de commande de flux basée sur une priorité (pfc), dispositif de transmission et dispositif de réception WO2015096548A1 (fr)

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CN105471754B (zh) * 2014-09-01 2019-01-18 华为技术有限公司 一种数据传输控制方法、设备及系统
JP7251075B2 (ja) * 2018-09-03 2023-04-04 株式会社オートネットワーク技術研究所 中継装置、中継方法及びコンピュータプログラム
CN109445855B (zh) * 2018-10-30 2021-11-16 天津津航计算技术研究所 一种用于多路低速外设集成的桥接装置
CN111835652B (zh) * 2019-04-17 2024-04-16 华为技术有限公司 一种数据流的虚拟通道的设置方法及装置
CN111555939B (zh) * 2020-04-28 2022-08-05 中国人民解放军总医院第四医学中心 一种监护仪信息采集系统
CN112565087A (zh) * 2020-11-23 2021-03-26 盛科网络（苏州）有限公司 一种pfc反压报文及其处理方法
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