WO2022135542A1 - 一种基于psn实现rdma网络丢包检测的方法及装置 - Google Patents

一种基于psn实现rdma网络丢包检测的方法及装置 Download PDF

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WO2022135542A1
WO2022135542A1 PCT/CN2021/140960 CN2021140960W WO2022135542A1 WO 2022135542 A1 WO2022135542 A1 WO 2022135542A1 CN 2021140960 W CN2021140960 W CN 2021140960W WO 2022135542 A1 WO2022135542 A1 WO 2022135542A1
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rdma
sequence number
message
packet
packet loss
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PCT/CN2021/140960
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English (en)
French (fr)
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王俊杰
成伟
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苏州盛科通信股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0823—Errors, e.g. transmission errors
    • H04L43/0829—Packet loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/04—Processing captured monitoring data, e.g. for logfile generation
    • H04L43/045—Processing captured monitoring data, e.g. for logfile generation for graphical visualisation of monitoring data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers

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  • the present invention requires the priority of the Chinese patent application filed on December 23, 2020 with the application number 202011538869.3 and the title of the invention "A method and device for realizing RDMA network packet loss detection based on PSN", the entire contents of which are passed Reference is incorporated herein.
  • Embodiments of the present invention relate to the field of network technologies, and in particular, to a method and device for packet loss detection in an RDMA network based on PSN.
  • Ethernet packet loss detection for high-performance RDMA (Remote Direct Memory Access) networks is that RDMA was originally designed to operate in InfiniBand (InfiniBand) networks without packet loss.
  • the latest RDMA standard, RoCEv2 has been supported to run on Ethernet. It is very sensitive to Ethernet packet loss and congestion. Due to the lack of a perfect packet loss detection mechanism, a packet loss rate of more than one thousandth will lead to the effectiveness of the RDMA network. A sharp decline.
  • RDMA network configuration optimization There are two main directions for RDMA network configuration optimization: one is to feed back the source server to adjust the sender's rate based on the packet loss detection result, and the other is to feed back the source server to adjust the sender's rate based on the degree of network congestion.
  • the traditional IP (Internet Protocols, Internet Protocol) network packet loss detection technology uses the NetFlow (network flow) function to collect data flow-based visualization information, such as the quintuple information of IP data flow, the number of lost packets forwarded by devices on the network and packet loss reasons, among which, NetFlow is used to collect statistics and forwarding information of data packets received and sent by network devices, and send the statistics and forwarding information to the NetFlow analysis server.
  • Information such as source IP, destination IP, etc., analyze NetFlow statistics to troubleshoot network failures and network congestion.
  • the current industry packet loss detection technology for RDMA networks is still the multiplexed IP network packet loss detection technology.
  • There is no packet loss detection mechanism designed for the characteristics of RDMA protocol packets which brings two problems: First, traditional NetFlow does not The detection range of packets is limited, and it can only detect the packet loss of the forwarding pipeline in the inbound and outbound directions of the network device of this hop. The packet loss of the link between the current hop device and the previous hop device cannot be detected.
  • the purpose of the embodiments of the present invention is to overcome the defects of the prior art, and provide a method and device for realizing RDMA network packet loss detection based on PSN, which can expand the scope of packet loss detection and directly trigger the source server to retransmit without waiting for the destination server. Send a retransmission message notification to improve the efficiency of packet loss retransmission.
  • the embodiment of the present invention proposes the following technical solution: a method for implementing RDMA network packet loss detection based on PSN, the method comprising:
  • the message sequence number is obtained through the following steps:
  • the UDP header length is used as the starting position of the UDF offset, and the packet sequence number is extracted according to the four-layer header offset length and the packet sequence number length.
  • the feature information includes source MAC address, destination MAC address, source IP address, destination IP address, UDP source port number and UDP destination port number.
  • the packet loss or disorder of the RDMA data stream is distinguished in the following manner:
  • the message sequence number of the current RDMA message is greater than or equal to the message sequence number of the previous RDMA message, it indicates that an exception occurs, and the abnormal event is reported to the management and control platform, and the current RDMA message is copied and sent.
  • the management and control platform determines whether there is packet loss and retransmission through the management and control platform.
  • the embodiment of the present invention also discloses a device for implementing RDMA network packet loss detection based on PSN, comprising:
  • a parsing module configured to receive and parse an RDMA message, and obtain feature information and a message sequence number carried by the RDMA message;
  • a search update module is set to form a search key according to the feature information and search for a NetFlow table entry, and update the NetFlow record table when found, and record the message sequence number of the current RDMA message;
  • the PSN processing module is set to determine whether the message sequence number of the current RDMA message is smaller than the message sequence number of the previous RDMA message, and when it is smaller than the message sequence number of the current RDMA message and the previous RDMA message Whether the difference between the packet sequence numbers is 1, if the difference is 1, no packet loss occurs in the RDMA data stream; otherwise, the RDMA data stream is out of sequence or out of sequence and packet loss occur at the same time.
  • the parsing module includes
  • the configuration module is set to the length of the four-layer header offset and the length of the message sequence number
  • the length obtaining module is set to parse the RDMA message and obtain the length of the UDP header
  • the extraction module is configured to use the UDP header length as the starting position of the UDF offset, and extract the packet sequence number according to the four-layer header offset length and the packet sequence number length.
  • the feature information includes source MAC address, destination MAC address, source IP address, destination IP address, UDP source port number and UDP destination port number.
  • the fault-tolerant module includes
  • the cycle configuration module is set to configure the fault-tolerant cycle
  • the judgment module is set to judge whether the message sequence number of the next RDMA message is between the message sequence number of the current RDMA message and the message sequence number of the previous RDMA message, and is within the fault-tolerant period;
  • the first determination module is set to determine that the message sequence number of the next RDMA message is between the message sequence number of the current RDMA message and the message sequence number of the previous RDMA message when the judgment module determines that it is fault-tolerant. In the cycle, it is determined that only disorder occurs;
  • the second determination module is set to the value or difference between the message sequence number of the current RDMA message and the message sequence number of the previous RDMA message when the judgment module judges that the message sequence number of the next RDMA message is not between the message sequence number of the current RDMA message and the message sequence number of the previous RDMA message. Within the fault-tolerant period, it is determined that packet loss and disorder occur.
  • the PSN processing module is also set to report the abnormal event to the control platform when the message sequence number of the current RDMA message is greater than or equal to the message sequence number of the previous RDMA message, and copy the current RDMA message on the Send it to the management and control platform, and judge whether there is packet loss and retransmission through the management and control platform.
  • the embodiment of the present invention can detect the overall packet loss situation of the RDMA data flow in the end-to-end network forwarding process, such as detecting the packet loss situation on the link, or detecting the loss caused by the congestion of the network equipment.
  • the traditional network device NetFlow can only detect the packet loss at the level of the device.
  • the PSN-based packet loss detection method implemented by going deep into the RDMA protocol stack in the embodiment of the present invention can acquire the packet sequence number corresponding to the forwarded packet in the RDMA data stream in real time, and can use the PSN information to directly trigger the source server Retransmission, so that the source server can quickly retransmit the RDMA packets corresponding to the packet sequence number, so that it can cooperate with the source server network card.
  • the NetFlow of the network switch can directly detect the packet loss in the RDMA data flow.
  • the message sequence number of the message is directly notified to the source server for retransmission without waiting for the destination server to send a message notification for retransmission, which speeds up the efficiency of packet loss and retransmission.
  • the embodiment of the present invention expands the processing of packet sequence numbers based on the NetFlow processing engine, so as to realize the packet loss detection mechanism, avoid designing the RDMA packet loss detection module separately, and reuse existing functions as much as possible, such as NetFlow's detection of data flow. Processing functions, etc., effectively reduce the difficulty and cost of chip design.
  • FIG. 1 is a schematic flowchart of a method according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of an RDMA message structure diagram according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a flowchart of a NetFlow table entry search according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a flowchart of packet loss detection according to an embodiment of the present invention.
  • FIG. 5 is a schematic block diagram of an apparatus structure according to an embodiment of the present invention.
  • a method for implementing RDMA network packet loss detection based on the PSN (Packet Sequence Number, packet sequence number) disclosed in the embodiment of the present invention can expand the range of packet loss detection, and can detect the occurrence of packet loss on the transmission path from the source server to the local hop device.
  • the packet loss detection is not limited to the packet loss detection of each hop device.
  • the PSN information can be used to directly trigger the source server to retransmit, without waiting for the destination server to send a retransmission message notification , to improve the efficiency of packet loss and retransmission.
  • a method for implementing RDMA network packet loss detection based on PSN includes the following steps:
  • RDMA messages are transmitted in the form of data streams, and the feature information possessed by each RDMA data stream is different from the feature information carried by other RDMA data streams, so different RDMA data streams can be identified according to the feature information.
  • the RDMA data stream is composed of multiple RMDA packets, as shown in Figure 2, which is the format of the RDMA data packet, which includes a MAC header (Media Access Control Header, media access control header), an IP header (IP Header) , UDP header (User Datagram Protocol Header, user data message header), BTH header (Base Transport Header, basic transmission header) and payload (Payload).
  • MAC header Media Access Control Header, media access control header
  • IP Header IP Header
  • UDP header User Datagram Protocol Header
  • BTH header Basic Transmission Header, basic transmission header
  • payload Payload
  • the received RDMA packet is first parsed, and the characteristic information carried in the packet and the packet serial number are obtained, wherein the characteristic information includes but is not limited to source MAC address, destination MAC address, source IP address , destination IP address, UDP source port number, UDP destination port number.
  • the message sequence number in the RDMA message can be extracted by using the UDF (User Defined Field, user-defined field) message parsing technology, and the UDP header carried in the RDMA message can be used when extracting the message sequence number. length.
  • the UDF packet parsing chip the RDMA packet is parsed to obtain the length of the UDP header, and the offset length of the four-layer header and the length of the packet sequence number are configured at the same time. The configured L4 header offset length and packet sequence number length are used to extract the packet sequence number.
  • the length of the message sequence number is 24 bits (bits)
  • the length of the minimum unit UDF message is 32 bits
  • the NetFlow technology in the embodiment of the present invention processes the RMDA data flow.
  • the NetFlow entry is searched according to the feature information.
  • the characteristic information is formed into a NetFlow keyword, and a NetFlow table entry is searched according to the NetFlow keyword. If it can be found, perform statistical update on the NetFlow record table (NetFlow Record), wherein the NetFlow record table includes a plurality of NetFlow entries, which are used to record the information that the data packets are forwarded within the network device and the chip, such as lost data packets. Packet statistics, packet loss reasons, etc.
  • the data flow is added to the NetFlow table entry, and a statistical update to the NetFlow record table is performed.
  • the packet sequence number of the current RMDA packet is recorded as the Current PSN, and it is updated to the NetFlow record table.
  • S300 Determine whether the packet sequence number of the current RDMA packet is smaller than the packet sequence number of the previous RDMA packet, and when it is smaller than the packet sequence number of the current RDMA packet and the packet sequence number of the previous RDMA packet Whether the difference is 1, if the difference is 1, no packet loss occurs in the RDMA data stream; otherwise, packet loss and/or disorder occurs in the RDMA data stream.
  • the message sequence number of the current RDMA message is smaller than the RDMA data flow recorded in the NetFlow record table. If it is less than the packet sequence number of the last RDMA packet, then judge whether the difference between the packet sequence number of the current RDMA packet and the packet sequence number of the previous RDMA packet is 1, and if the difference is 1 1, it means that no packet loss occurs in the RDMA data stream. If the difference between the two is not 1, that is, the difference between the two is greater than 1, it means that packet loss and/or disorder may occur in the RDMA data stream.
  • the packet sequence number of the current RDMA packet is smaller than the packet sequence number of the previous RDMA packet, the packet sequence number of the current RDMA packet is the same as the packet sequence number of the previous RDMA packet.
  • the range of the difference is greater than or equal to 1.
  • the message sequence number of the current RDMA message is greater than or equal to the message sequence number of the previous RDMA message, it indicates that an exception occurs.
  • the event needs to be reported to the management and control platform, and a copy of the RDMA message is sent to the management and control platform. To determine whether there is packet loss and retransmission or other abnormal conditions.
  • a fault tolerance period to determine whether the packet sequence number of the next RDMA packet is between the packet sequence number of the current RDMA packet and the packet sequence number of the previous RDMA packet, and it is in the fault tolerance period. If it is, it means that only out-of-order occurs; otherwise, it means that packet loss and out-of-order occur.
  • the length of the fault-tolerant period is configured to be every 1000 RDMA packets
  • the PSN of the next packet is still between the currently recorded PSN and The value between the PSNs of the previous and next packets, and within 1000 packets, will all cover this interval, it can be considered that only congestion occurs out of sequence and is sent to the management and control platform, and no packet loss occurs. If this interval value is not fully covered, it means that packet loss and disorder occur, and it will be reported to the management and control platform.
  • an embodiment of the present invention further discloses a device for implementing RDMA network packet loss detection based on PSN, the device includes a parsing module, a search and update module, and a PSN processing module, wherein the parsing module is configured to receive RDMA packets. Parse the text and obtain the feature information and message serial number carried by the RDMA message.
  • the feature information includes but is not limited to source MAC address, destination MAC address, source IP address, destination IP address, UDP source port number and UDP destination port.
  • the search update module is set to form a search key according to the feature information and search for the NetFlow table entry, and update the NetFlow record table when found, record the message sequence number of the current RDMA message;
  • the PSN processing module is set to Determine whether the packet sequence number of the current RDMA packet is smaller than the packet sequence number of the previous RDMA packet, and if it is less than the packet sequence number of the current RDMA packet and the packet sequence number of the previous RDMA packet, determine the difference Whether the value is 1, if the difference is 1, no packet loss occurs in the RDMA data stream; otherwise, packet loss and/or out-of-order occurs in the RDMA data stream.
  • the parsing module includes a configuration module, a length acquisition module and an extraction module, wherein the configuration module is set to configure the four-layer header offset length and the message sequence number length; the length acquisition module is set to parse the RDMA message , to obtain the length of the UDP header; the extraction module is set to take the length of the UDP header as the starting position of the UDF offset, and extract the message sequence number according to the length of the four-layer header offset and the length of the message sequence number. Since the length of the message serial number is 24 bits, if the length of the minimum unit UDF message is 32 bits, it is necessary to set the UDF mask (UDF Mask) to make the minimum UDF Field 24 bits, which is convenient for obtaining the message serial number.
  • UDF Mask UDF mask
  • the search and update module includes a group keyword generation module, a table entry search module and a record table processing module, wherein the keyword generation module is set to form a NetFlow keyword according to the feature information; the table entry search module is set to The NetFlow entry is searched according to the NetFlow keyword; the Record processing module is configured to update the NetFlow record table when the NetFlow entry is found, and record the packet sequence number of the current RDMA packet.
  • the keyword generation module composes the characteristic information into a NetFlow keyword, and the entry search module searches for a NetFlow entry according to the NetFlow keyword.
  • the record table processing module executes the update of NetFlow Record statistics, wherein the NetFlow record table includes a plurality of NetFlow entries, which are used to record the information that the data packets are forwarded in the network device and the chip, such as packet loss Statistics, packet loss reasons, etc.
  • the NetFlow record table includes a plurality of NetFlow entries, which are used to record the information that the data packets are forwarded in the network device and the chip, such as packet loss Statistics, packet loss reasons, etc.
  • the Record processing module adds the data flow to the NetFlow table entry, and performs statistical update to the NetFlow record table.
  • the packet sequence number of the current RMDA packet is recorded as the Current PSN, and it is updated to the NetFlow record table.
  • the apparatus further includes a fault tolerance module configured to distinguish out-of-order and packet loss.
  • a fault tolerance module configured to distinguish out-of-order and packet loss.
  • the fault-tolerant module includes a period configuration module, which is set to configure the fault-tolerant period.
  • the fault-tolerant period can be flexibly configured. For example, the length of the fault-tolerant period is configured to be every 1000 RDMA packets; the judgment module is set to judge the next RDMA packet.
  • the first determination module is set to determine the next RDMA in the judgment module If the message sequence number of the message is between the message sequence number of the current RDMA message and the message sequence number of the previous RDMA message and is within the fault-tolerant period, it is determined that only disorder occurs; the second determination module, It is set to the value between the message sequence number of the current RDMA message and the message sequence number of the previous RDMA message when the judgment module judges that the message sequence number of the next RDMA message is not within the fault tolerance period. It is determined that packet loss and out-of-order occurred.
  • the PSN of the next packet is still between the current recorded PSN and the PSN of the previous next packet, and all 1000 packets will cover this interval, it can be considered that only the occurrence of The congestion is out of order and sent to the management and control platform, and no packet loss occurs. If this interval value is not fully covered, it means that packet loss and disorder occur, and it will be reported to the management and control platform.
  • the packet loss detection capability of the RDMA network is natively realized by extracting the packet serial number and adding the state recording and comparison of the packet serial number on the basis of NetFlow.
  • the embodiment of the present invention also simplifies the packet loss detection mechanism by using the packet sequence number, which can more accurately implement the end-to-end short packet loss detection. Compared with the traditional packet loss detection method, the embodiment of the present invention also has the following advantages:
  • the embodiment of the present invention can detect the overall packet loss situation of the RDMA data flow in the end-to-end network forwarding process, such as detecting the packet loss situation on the link, or detecting the loss caused by the congestion of the network equipment.
  • the traditional network device NetFlow can only detect the packet loss at the level of the device.
  • the PSN-based packet loss detection method implemented by going deep into the RDMA protocol stack in the embodiment of the present invention can acquire the packet sequence number corresponding to the forwarded packet in the RDMA data stream in real time, and can use the PSN information to directly trigger the source server Retransmission, so that the source server can quickly retransmit the RDMA packets corresponding to the packet sequence number, so that it can cooperate with the source server network card.
  • the NetFlow of the network switch can directly detect the packet loss in the RDMA data flow.
  • the message sequence number of the message is directly notified to the source server for retransmission without waiting for the destination server to send a message notification for retransmission, which speeds up the efficiency of packet loss and retransmission.
  • the embodiment of the present invention expands the processing of packet sequence numbers based on the NetFlow processing engine, so as to realize the packet loss detection mechanism, avoid designing the RDMA packet loss detection module separately, and reuse existing functions as much as possible, such as NetFlow's detection of data flow. Processing functions, etc., effectively reduce the difficulty and cost of chip design.

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Abstract

本发明实施例揭示了一种基于PSN实现RDMA网络丢包检测的方法及装置，方法包括接收RDMA报文并解析，获取报文的特征信息及报文序列号；根据特征信息查找NetFlow表项，在查找到时更新NetFlow记录，并记录当前RDMA报文；判断当前RDMA报文的报文序列号是否小于上一个RDMA报文的报文序列号，并在小于时判断当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号的差值是否为1，若是，则表示该RDMA数据流未丢包，否则，表示该RDMA数据流发生丢包和/或乱序。本发明实施例能够扩大丢包检测范围并能够利用报文序列号信息直接触发源端服务器重传，无需等待目的服务器发送重传的消息通告，提高丢包重传效率。

Description

一种基于PSN实现RDMA网络丢包检测的方法及装置
本发明要求于2020年12月23日提交中国专利局、申请号为202011538869.3、发明名称“一种基于PSN实现RDMA网络丢包检测的方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本发明中。
技术领域
本发明实施例涉及一种网络技术领域，尤其是涉及一种基于PSN实现RDMA网络的丢包检测方法及装置。
背景技术
针对高性能RDMA(Remote Direct Memory Access，远程直接数据存储)网络实现以太网丢包检测的重要原因是因为RDMA的设计之初是运动在无丢包的InfiniBand(无限带宽)网络中。当前RDMA最新标准RoCEv2已支持运行在以太网上，其对以太网丢包和拥塞异常敏感，由于缺乏完善的丢包检测机制，因此，超过千分之一的丢包率都将导致RDMA网络有效性急剧下降。
目前，业界期望通过流控技术来动态调整RDMA网络配置，以达到最佳性能。RDMA网络配置优化方向主要有两个：一是基于丢包检测结果来反馈源服务器进行发送端速率调整，二是基于网络拥塞程度来反馈源服务器进行发送端速率调整。传统的IP(Internet Protocols，网际互联协议)网络的丢包检测技术通过NetFlow(网络流)功能来收集基于数据流的可视化信息，如IP数据流的五元组信息、网络上设备转发丢包数量和丢包原因，其中，NetFlow用于收集网络设备接收和发送的数据报文统计信息和转发信息，并将统计信息和转发信息发送到NetFlow分析服务器，网络管理人员可以根据业务数据报文的特征信息，比如源IP，目的IP等，分 析NetFlow的统计信息来排查网络故障，以及网络拥塞等原因。
当前业界针对RDMA网络的丢包检测技术仍然是复用IP网络丢包检测技术，没有针对RDMA协议报文的特征进行设计丢包检测机制，带来的问题有两个：一是传统NetFlow对于丢包的检测范围有限，只能检测本跳网络设备的入方向和出方向转发流水线的丢包，不仅对于网络设备内部的队列拥塞丢包无法感知(需要MoD(Mirror on Drop，丢包镜像)功能配合)，本跳设备与上一跳设备之间的链路丢包也无法检测出来；二是由于检测机制复用的IP网络NetFlow设计，导致对于丢包结果并没有RDMA协议栈相关的信息，也就无法与服务器网卡形成协同方案，无法实现通过网络交换机检测到某个RDMA报文的丢包，直接触发源端服务器重传，需等待目的服务器发送重传的消息通告，重传效率低。
发明内容
本发明实施例的目的在于克服现有技术的缺陷，提供一种基于PSN实现RDMA网络丢包检测的方法及装置，能够扩大丢包检测范围并能够直接触发源端服务器重传，无需等待目的服务器发送重传的消息通告，提高丢包重传效率。
为实现上述目的，本发明实施例提出如下技术方案：一种基于PSN实现RDMA网络丢包检测的方法，所述方法包括
接收RDMA报文并解析，获取所述RDMA报文携带的特征信息及报文序列号；
根据所述特征信息形成NetFlow关键字并查找NetFlow表项，在查找到时更新NetFlow记录表，并记录当前RDMA报文的报文序列号；
判断当前RDMA报文的报文序列号是否小于上一个RDMA报文的报文序列号，并在小于时判断当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号的差值是否为1，若差值为1，则表示该RDMA数据流未丢包，否则，表示该RDMA数据流发生丢包和/或乱序。
可选地，所述报文序列号通过如下步骤获得：
配置四层头偏移长度及报文序列号长度；
对RDMA报文进行解析，获得UDP头部长度；
将所述UDP头部长度作为UDF偏移的起始位置，并根据所述四层头偏移长度和报文序列号长度提取出报文序列号。
可选地，所述特征信息包括源MAC地址、目的MAC地址、源IP地址、目的IP地址、UDP源端口号和UDP目的端口号。
可选地，所述RDMA数据流丢包或者乱序通过如下方式区分：
配置容错周期；
判断下一个RDMA报文的报文序列号是否处于当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号之间的数值，且处于容错周期内，若是，则表示只发生乱序；否则表示发生丢包及乱序。
可选地，若当前RDMA报文的报文序列号大于或等于上一个RDMA报文的报文序列号，则表示出现异常，将该异常事件上报管控平台，并将当前RDMA报文复制上送管控平台，通过管控平台判断是否出现丢包重传。
本发明实施例还揭示了一种基于PSN实现RDMA网络丢包检测的装置，包括
解析模块，被设置为接收RDMA报文并解析，获取所述RDMA报文携带的特征信息及报文序列号；
查找更新模块，被设置为根据所述特征信息形成查找关键字并查找NetFlow表项，并在查找到时更新NetFlow记录表，记录当前RDMA报文的报文序列号；
PSN处理模块，被设置为判断当前RDMA报文的报文序列号是否小 于上一个RDMA报文的报文序列号，并在小于时判断当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号的差值是否为1，若差值为1，则该RDMA数据流未发生丢包，否则，该RDMA数据流发生乱序或者乱序与丢包同时发生。
可选地，所述解析模块包括
配置模块，被设置为四层头偏移长度及报文序列号长度；
长度获取模块，被设置为对RDMA报文进行解析，获得UDP头部长度；
提取模块，被设置为将所述UDP头部长度作为UDF偏移的起始位置，并根据所述四层头偏移长度和报文序列号长度提取出报文序列号。
可选地，所述特征信息包括源MAC地址、目的MAC地址、源IP地址、目的IP地址、UDP源端口号和UDP目的端口号。
可选地，还包括容错模块，所述容错模块包括
周期配置模块，被设置为配置容错周期；
判断模块，被设置为判断下一个RDMA报文的报文序列号是否处于当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号之间的数值，且处于容错周期内；
第一确定模块，被设置为在判断模块判断下一个RDMA报文的报文序列号处于当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号之间的数值且处于容错周期内则确定为只发生乱序；
第二确定模块，被设置为在判断模块判断下一个RDMA报文的报文序列号不处于当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号之间的数值或不处于容错周期内则确定为发生丢包及乱序。
可选地，PSN处理模块还被设置为在当前RDMA报文的报文序列号 大于或等于上一个RDMA报文的报文序列号时将异常事件上报管控平台，并将当前RDMA报文复制上送管控平台，通过管控平台判断是否出现丢包重传。
本发明实施例的有益效果是：
(1)本发明实施例能够对RDMA数据流在端到端网络转发过程中整体的丢包情况进行检测，如检测在链路上的丢包情况，或者检测因网络设备的拥塞而导致的丢包情况，而传统的网络设备NetFlow只能检测本设备级别的丢包。
(2)本发明实施例通过深入RDMA协议栈实现的基于PSN的丢包检测方法，能够实时获取RDMA数据流中转发报文所对应的报文序列号，并能够利用PSN信息直接触发源端服务器重传，使源服务器能够快速执行丢包重传对应报文序列号的RDMA报文，这样可以与源服务器网卡进行协同，如直接由网络交换机的NetFlow精确检测到RDMA数据流中的丢包报文的报文序列号，直接通知源服务器进行重传，而不需要等待目的服务器发送重传的消息通告，加快的丢包重传的效率。
(3)本发明实施例基于NetFlow处理引擎扩展支持报文序列号的处理，以实现丢包检测机制，避免单独设计RDMA丢包检测模块，尽可能复用已有功能，如NetFlow对数据流的处理功能等，有效降低了芯片设计难度和成本。
附图说明
图1是本发明实施例的方法流程图示意图；
图2是本发明实施例的RDMA报文结构图示意图；
图3是本发明实施例的NetFlow表项查找流程图示意图；
图4是本发明实施例的丢包检测流程图示意图；
图5是本发明实施例的装置结构框图示意图。
具体实施方式
下面将结合本发明实施例的附图，对本发明实施例的技术方案进行清楚、完整的描述。
本发明实施例所揭示的一种基于PSN(Packet Sequence Number，报文序列号)实现RDMA网络丢包检测的方法，能够扩大丢包检测范围，可对源服务器到本跳设备的传输路径上发生的丢包进行检测，而不只局限于每跳设备的丢包检测，同时，通过基于PSN的丢包检测，能够利用PSN信息直接触发源端服务器重传，无需等待目的服务器发送重传的消息通告，提高丢包重传效率。
如图1所示，为本发明实施例所揭示的一种基于PSN实现RDMA网络丢包检测的方法，包括如下步骤：
S100，接收RDMA报文并解析，获取所述RDMA报文携带的特征信息及报文序列号；
可选地，在RDMA网络中，RDMA报文以数据流形式传输，每个RDMA数据流所具有的特征信息与其他RDMA数据流所携带的特征信息不同，因而可根据该特征信息识别不同的RDMA数据流。RDMA数据流由多个RMDA报文构成，如图2所示，为RDMA数据报文的格式，其包括MAC头部(Media Access Control Header，媒体访问控制头部)、IP头部(IP Header)、UDP头部(User Datagram Protocol Header，用户数据报文头部)、BTH头部(Base Transport Header，基础传输头部)和负载(Payload)。在进行丢包检测时，首先对接收到的RDMA报文进行解析，获取报文携带的特征信息及报文序列号，其中，特征信息包括但不限于源MAC地址、目的MAC地址、源IP地址、目的IP地址、UDP源端口号、UDP目的端口号。
可选地，RDMA报文中的报文序列号可通过UDF(User Defined Field，用户自定义字段)报文解析技术提取，在提取报文序列号时可利用RDMA报文中携带的UDP头部的长度。可选地，在UDF报文解析芯片中，对RDMA报文进行解析，获得UDP头部的长度，同时配置四层头偏移长度及报文序列号长度，再根据UDP头部的长度及已配置的四层头偏移长度及报文序列号长度来提取报文序列号。由于报文序列号的长度为24bit(比特)，若最小单位的UDF报文长度为32bit，则还需通过设置UDF掩码(UDF Mask)以使最小UDF报文长度为24bit，便于报文序列号的获取。
通过利用UDF报文解析技术获取RDMA报文携带的报文序列号，能够解决传统NetFlow对RDMA数据流的丢包检测无法感知RDMA深层协议字段的问题。
S200，根据所述特征信息形成NetFlow关键字并查找NetFlow表项，在查找到时更新NetFlow记录表，并记录当前RDMA报文的报文序列号；
结合图1和图2所示，本发明实施例NetFlow技术对RMDA数据流进行处理。对当获取上述RDMA报文携带的特征信息及报文序列号后，根据该特征信息查找NetFlow表项。实施时，将特征信息组成NetFlow关键字，并依据该NetFlow关键字查找NetFlow表项。如果能够查找到，则执行对NetFlow记录表(NetFlow Record)的统计更新，其中，NetFlow记录表包括多个NetFlow表项，其用于记录数据报文在网络设备和芯片内部转发的信息，如丢包统计、丢包原因等等。当查找到相应NetFlow表项并对NetFlow记录表进行更新时，将当前RMDA报文的报文序列号记录为Current PSN(当前的PSN)，将上一个RDMA报文的报文序列号记为Last PSN(最后一个PSN)，并将两者更新至NetFlow记录表中。
如果未能够查找到，则将该数据流添加至NetFlow表项中，并执行对NetFlow记录表的统计更新。当未查找到相应NetFlow表项并对NetFlow记录表进行更新时，将当前RMDA报文的报文序列号记录为Current PSN，并将其更新至NetFlow记录表中。
S300，判断当前RDMA报文的报文序列号是否小于上一个RDMA报文的报文序列号，并在小于时判断当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号的差值是否为1，若差值为1，则该RDMA数据流未发生丢包，否则，该RDMA数据流发生丢包和/或乱序。
可选地，当获取当前RDMA报文的报文序列号及上一个RDMA报文的报文序列号后，判断当前RDMA报文的报文序列号是否小于NetFlow记录表中记录的该RDMA数据流的上一个RDMA报文的报文序列号，如果小于，则判断当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号的差值是否为1，若两者差值为1，则表明该RDMA数据流并未发生丢包。如果两者的差值不为1，即两者的差值大于1，则表示该RDMA数据流可能发生丢包和/或乱序。需要说明的是，在当前RDMA报文的报文序列号小于上一个RDMA报文的报文序列号的情况下，当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号的差值的范围为大于或等于1。
如果当前RDMA报文的报文序列号大于或等于上一个RDMA报文的报文序列号，表示出现异常，需将该事件上报管控平台，并将该RDMA报文复制一份上送管控平台，以判断是否出现丢包重传或者其他异常情况。
当完成NetFlow丢包检测后，继续完成报文的转发处理。
可选地，结合图1和图4所示，为了提高丢包检测的准确性，在当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号的差值大于1时，还需对乱序和丢包加以区分。实施时，配置一容错周期，判断下一个RDMA报文的报文序列号是否处于当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号之间的数值，且处于容错周期内，若是，则表示只发生乱序；否则表示发生丢包及乱序，如将容错周期长度配置为每1000个RDMA报文，如果接下来的报文的PSN依然处于该当前记录的PSN与之前的下一个的报文PSN之间的数值，且1000个报文内，将全 部覆盖这个区间，即可认为只是发生拥塞乱序并上送管控平台，未发生丢包。如果未能全部覆盖这个区间值，就表示发生丢包，以及乱序，并上报管控平台。
如图5所示，本发明实施例还揭示了一种基于PSN实现RDMA网络丢包检测的装置，该装置包括解析模块、查找更新模块和PSN处理模块，其中，解析模块被设置为接收RDMA报文并解析，获取所述RDMA报文携带的特征信息及报文序列号，特征信息包括但不限于源MAC地址、目的MAC地址、源IP地址、目的IP地址、UDP源端口号和UDP目的端口号；查找更新模块被设置为根据所述特征信息形成查找关键字并查找NetFlow表项，并在查找到时更新NetFlow记录表，记录当前RDMA报文的报文序列号；PSN处理模块被设置为判断当前RDMA报文的报文序列号是否小于上一个RDMA报文的报文序列号，并在小于时判断当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号的差值是否为1，若差值为1，则该RDMA数据流未发生丢包，否则，该RDMA数据流发生丢包和/或乱序。
可选地，解析模块包括配置模块、长度获取模块和提取模块，其中，配置模块被设置为配置四层头偏移长度及报文序列号长度；长度获取模块被设置为对RDMA报文进行解析，获得UDP头部长度；提取模块被设置为将所述UDP头部长度作为UDF偏移的起始位置，并根据所述四层头偏移长度及报文序列号长度提取报文序列号。由于报文序列号的长度为24bit，若最小单位的UDF报文长度为32bit，则还需通过设置UDF掩码(UDF Mask)以使最小UDF Field为24bit，便于报文序列号的获取。
可选地，查找更新模块包括组关键字生成模块、表项查找模块和记录表处理模块，其中，关键字生成模块被设置为根据所述特征信息组成NetFlow关键字；表项查找模块被设置为根据所述NetFlow关键字查找NetFlow表项；Record处理模块被设置为在查找到NetFlow表项时更新NetFlow记录表，记录当前RDMA报文的报文序列号。实施时，关键字生 成模块将特征信息组成NetFlow关键字，表项查找模块依据该NetFlow关键字查找NetFlow表项。如果能够查找到，则记录表处理模块执行对NetFlow Record统计的更新，其中，NetFlow记录表包括多个NetFlow表项，其用于记录数据报文在网络设备和芯片内部转发的信息，如丢包统计、丢包原因等等。当查找到相应NetFlow表项并对NetFlow记录表进行更新时，将当前RMDA报文的报文序列号记录为Current PSN，将上一个RDMA报文的报文序列号记为Last PSN，并将两者更新至NetFlow记录表中。如果未能够查找到，Record处理模块则将该数据流添加至NetFlow表项中，并执行对NetFlow记录表的统计更新。当未查找到相应NetFlow表项并对NetFlow记录表进行更新时，将当前RMDA报文的报文序列号记录为Current PSN，并将其更新至NetFlow记录表中。
可选地，装置还包括被设置为对乱序和丢包进行区分的容错模块。为了提高丢包检测的准确性，在当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号的差值大于1时，还需对乱序和丢包加以区分。容错模块包括周期配置模块，被设置为配置容错周期，该容错周期可灵活配置，如将容错周期长度配置为每1000个RDMA报文；判断模块，被设置为判断下一个RDMA报文的报文序列号是否处于当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号之间的数值，且处于容错周期内；第一确定模块，被设置为在判断模块判断下一个RDMA报文的报文序列号处于当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号之间的数值且处于容错周期内则确定为只发生乱序；第二确定模块，被设置为在判断模块判断下一个RDMA报文的报文序列号不处于当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号之间的数值或不处于容错周期内则确定为发生丢包及乱序。实施时，如果接下来的报文的PSN依然处于该当前记录的PSN与之前的下一个的报文PSN之间的数值，且1000个报文内，将全部覆盖这个区间，即可认为只是发生拥塞乱序并上送管控平台，未发生丢包。如果未能全部覆盖这个区间值，就表示发生丢包，以及乱序，并上报管控平台。
本发明实施例通过提取报文序列号并在NetFlow基础上增加对报文序列号的状态记录和比较，原生实现RDMA网络的丢包检测能力。另外，本发明实施例还通过报文序列号来简化丢包检测机制，能够更为精准的实现端倒短丢包检测，相对于传统的丢包检测方法，本发明实施例还具有如下优点：
(1)本发明实施例能够对RDMA数据流在端到端网络转发过程中整体的丢包情况进行检测，如检测在链路上的丢包情况，或者检测因网络设备的拥塞而导致的丢包情况，而传统的网络设备NetFlow只能检测本设备级别的丢包。
(2)本发明实施例通过深入RDMA协议栈实现的基于PSN的丢包检测方法，能够实时获取RDMA数据流中转发报文所对应的报文序列号，并能够利用PSN信息直接触发源端服务器重传，使源服务器能够快速执行丢包重传对应报文序列号的RDMA报文，这样可以与源服务器网卡进行协同，如直接由网络交换机的NetFlow精确检测到RDMA数据流中的丢包报文的报文序列号，直接通知源服务器进行重传，而不需要等待目的服务器发送重传的消息通告，加快的丢包重传的效率。
(3)本发明实施例基于NetFlow处理引擎扩展支持报文序列号的处理，以实现丢包检测机制，避免单独设计RDMA丢包检测模块，尽可能复用已有功能，如NetFlow对数据流的处理功能等，有效降低了芯片设计难度和成本。
本发明实施例的技术内容及技术特征已揭示如上，然而熟悉本领域的技术人员仍可能基于本发明实施例的教示及揭示而作种种不背离本发明实施例精神的替换及修饰，因此，本发明实施例保护范围应不限于实施例所揭示的内容，而应包括各种不背离本发明实施例的替换及修饰，并为本专利申请权利要求所涵盖。

Claims (10)

  1. 一种基于PSN实现RDMA网络丢包检测的方法，所述方法包括
    接收RDMA报文并解析，获取所述RDMA报文携带的特征信息及报文序列号；
    根据所述特征信息形成NetFlow关键字并查找NetFlow表项，在查找到时更新NetFlow记录表，并记录当前RDMA报文的报文序列号；
    判断当前RDMA报文的报文序列号是否小于上一个RDMA报文的报文序列号，并在小于时判断当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号的差值是否为1，若差值为1，则表示该RDMA数据流未丢包，否则，表示该RDMA数据流发生丢包和/或乱序。
  2. 根据权利要求1所述的方法，其中，所述报文序列号通过如下步骤获得：
    配置四层头偏移长度及报文序列号长度；
    对RDMA报文进行解析，获得UDP头部长度；
    将所述UDP头部长度作为UDF偏移的起始位置，并根据所述四层头偏移长度和报文序列号长度提取出报文序列号。
  3. 根据权利要求1所述的方法，其中，所述特征信息包括源MAC地址、目的MAC地址、源IP地址、目的IP地址、UDP源端口号和UDP目的端口号。
  4. 根据权利要求1所述的方法，其中，所述RDMA数据流丢包或者乱序通过如下方式区分：
    配置容错周期；
    判断下一个RDMA报文的报文序列号是否处于当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号之间的数值，且处于容错周期内，若是，则表示只发生乱序；否则表示发生丢包及乱序。
  5. 根据权利要求1所述的方法，其中，若当前RDMA报文的报文序列号大于或等于上一个RDMA报文的报文序列号，则表示出现异常，将该异常事件上报管控平台，并将当前RDMA报文复制上送管控平台，通过管控平台判断是否出现丢包重传。
  6. 一种基于PSN实现RDMA网络丢包检测的装置，包括
    解析模块，被设置为接收RDMA报文并解析，获取所述RDMA报文携带的特征信息及报文序列号；
    查找更新模块，被设置为根据所述特征信息形成查找关键字并查找NetFlow表项，并在查找到时更新NetFlow记录表，记录当前RDMA报文的报文序列号；
    PSN处理模块，被设置为判断当前RDMA报文的报文序列号是否小于上一个RDMA报文的报文序列号，并在小于时判断当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号的差值是否为1，若差值为1，则该RDMA数据流未发生丢包，否则，该RDMA数据流发生丢包和/或乱序。
  7. 根据权利要求6所述的装置，其中，所述解析模块包括
    配置模块，被设置为四层头偏移长度及报文序列号长度；
    长度获取模块，被设置为对RDMA报文进行解析，获得UDP头部长度；
    提取模块，被设置为将所述UDP头部长度作为UDF偏移的起始位置，并根据所述四层头偏移长度和报文序列号长度提取出报文序列号。
  8. 根据权利要求6所述的装置，其中，所述特征信息包括源MAC地址、目的MAC地址、源IP地址、目的IP地址、UDP源端口号和UDP目的端口号。
  9. 根据权利要求6所述的装置，其中，还包括容错模块，所述容错模块包括
    周期配置模块，被设置为配置容错周期；
    判断模块，被设置为判断下一个RDMA报文的报文序列号是否处于当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号之间的数值，且处于容错周期内；
    第一确定模块，被设置为在判断模块判断下一个RDMA报文的报文序列号处于当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号之间的数值且处于容错周期内则确定为只发生乱序；
    第二确定模块，被设置为在判断模块判断下一个RDMA报文的报文序列号不处于当前RDMA报文的报文序列号与上一个RDMA报文的报文序列号之间的数值或不处于容错周期内则确定为发生丢包及乱序。
  10. 根据权利要求6所述的装置，其中，所述PSN处理模块还被设置为在当前RDMA报文的报文序列号大于或等于上一个RDMA报文的报文序列号时将异常事件上报管控平台，并将当前RDMA报文复制上送管控平台，通过管控平台判断是否出现丢包重传。
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