CN111050339B - High-speed data updating system and method based on protocol non-perception forwarding - Google Patents
High-speed data updating system and method based on protocol non-perception forwarding Download PDFInfo
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Abstract
The invention discloses a high-speed data updating system and method based on protocol non-perception forwarding, and a corresponding protocol irrelevant forwarding device comprises: the system is based on a DPDK-driven protocol non-perception forwarding module, the protocol non-perception forwarding module is used as a module based on DPDK drive to operate in a user mode, and the protocol non-perception forwarding module comprises a functional plane sub-module, a Metadata data query function sub-module, a Metadata data update function sub-module, a flow table maintenance function sub-module and a routing function sub-module; the protocol unaware forwarding module based on the DPDK drive utilizes a DPDK development kit to realize that the sub-modules under the module process the data packet of the protocol independent forwarding device by reading the data packet from the network card hardware device in a polling mode and bypassing the kernel of an operating system. The invention has the advantage of updating data at high speed.
Description
Technical Field
The invention relates to a high-speed updating system and method based on protocol non-perception forwarding, belonging to the technical field of software defined networks.
Background
The software defined network separates the control and forwarding of the network, provides a centralized control plane, and monitors, configures and manages the whole network. The software defined network is an innovation of the traditional network architecture, and the software defined network architecture is divided into an application layer, a control layer and a forwarding layer. The physical entity corresponding to the forwarding layer is a protocol agnostic forwarding device, and the physical entity corresponding to the control layer is a network controller. The protocol non-sensing forwarding equipment is responsible for high-speed forwarding of network data, and forwarding decisions of the protocol non-sensing forwarding equipment come from a network controller. And the network controller performs centralized unified management on the protocol unaware forwarding equipment through the southbound interface. The software defined network enables the forwarding layer to have the programmable capability, and the analysis and forwarding processes of the data packet are controlled by programming, so that the functional limitation of hardware equipment on the forwarding plane is broken.
The current protocol forwarding devices are classified into two categories, one is protocol-aware forwarding device, and the other is protocol-unaware forwarding device. Protocol aware forwarding devices design fixed operating logic based on known protocol types. If the data packet entering the forwarding device is of a known protocol type, the device can perform read-write access operation on the field of the data packet according to the corresponding protocol type, and if the data packet is of a protocol of an unknown format, the data packet cannot be processed, so that the protocol-aware forwarding device is called as protocol-bound. The disadvantage is inflexibility, and for some new protocols, if the protocol-aware forwarding device does not update software in time, the data packet of the new protocol cannot be identified. The protocol non-sensing technology overcomes the defect, a matching domain is formed by specifying the offset and the length of a data packet, a flexible matching domain is utilized to identify the data packet field of any protocol format, so that the forwarding equipment does not need to sense the protocol type of a message, the protocol non-sensing forwarding equipment works according to a matching-action mode, namely, certain fields of the data packet are compared with the matching domain of a flow table item, and if the fields of the data packet are matched with the matching domain of the flow table item, the action of the flow table item is executed, such as data packet forwarding operation, data packet discarding operation, data packet field modifying operation and the like. The data packet processing logic is controlled by the network controller, so the protocol-unaware forwarding device has greater flexibility and supports data packets in any protocol format.
In the prior art, an update data packet carrying a user update instruction needs to be firstly input into a protocol stack of an operating system for decapsulation processing, then input into a database system for updating, then an update result is returned to the protocol stack for response data packet encapsulation, and finally the response data packet is sent to a client. The technology has the disadvantages of long data packet processing process and low efficiency. The current internet has more and more strict requirements on service time delay, and the existing data updating technology is used, so that the time delay cannot adapt to the scene of large-scale data quick updating in the world of everything interconnection.
Disclosure of Invention
The invention solves the problems: the system and the method for updating the high-speed data based on the protocol non-perception forwarding are used for realizing the decapsulation of the update data packet, the data updating, the encapsulation of the response data packet and the like by utilizing the data plane protocol non-perception forwarding technology so as to achieve the aim of updating the data at a high speed.
The technical scheme of the invention is as follows:
the invention relates to a high-speed data updating system based on protocol unaware forwarding, and a corresponding protocol independent forwarding device thereof comprises: the system is based on a DPDK-driven protocol non-perception forwarding module, the protocol non-perception forwarding module is used as a module based on DPDK drive to operate in a user mode, and the protocol non-perception forwarding module comprises a functional plane sub-module, a Metadata data query function sub-module, a Metadata data update function sub-module, a flow table maintenance function sub-module and a routing function sub-module; the protocol unaware forwarding module based on DPDK drive utilizes DPDK development kit to realize that the sub-module under the module processes the data packet of the protocol independent forwarding device by reading the data packet from the network card hardware device in a polling way and bypassing the kernel of the operating system; metadata is data which is stored by the protocol unaware forwarding equipment and can be shared among flow table items, and a user can update the data in the area through a protocol unaware technology and a Metadata data content operation instruction set; wherein:
the functional plane submodule receives a data packet carrying an updating instruction and judges the functional submodule triggered by the data packet according to the field value of the functional plane ID of the data packet; the function plane ID is an indication protocol unaware forwarding device, and the field of the data packet includes, in addition to the field of the function plane ID: table ID, data ID, opcode, and data update content; the table ID indicates the table to which the data to be updated belongs; the data ID indicates the index of the data to be updated in the table indicated by the table ID; the operation code indicates an operation to be performed on the data; the data updating content refers to the updating content of the stored data;
the Metadata data query function sub-module is responsible for performing query operation on a Metadata data area;
the Metadata data updating function sub-module is responsible for updating the Metadata data area; the module is provided with a Metadata data content operation instruction set supporting the modification of all contents of Metadata data, and the instruction set enables the updating contents carried by the data packet to directly cover the designated position of the Metadata so as to complete the updating task;
the flow table maintenance function sub-module is responsible for modifying, issuing, deleting and reporting the flow table items of the protocol-independent forwarding equipment; the flow table entry is a basic composition of a protocol unaware forwarding device, the protocol unaware forwarding device comprises a plurality of flow tables, and each flow table comprises a plurality of flow table entries;
and the routing function sub-module is responsible for packaging and forwarding the response data packet of the protocol-independent forwarding equipment.
The invention relates to a high-speed data updating method based on protocol unaware forwarding, which comprises the following steps:
(1) the updating request of the client is packaged well according to the protocol format of the function plane ID, the table ID, the data ID, the operation code and the data updating content, and is used as an updating data packet and sent to the protocol unaware forwarding equipment;
(2) the protocol unaware forwarding module receives an update data packet sent by a client from a network card device in a DPDK-driven CPU polling mode, the protocol unaware forwarding device is provided with a plurality of functional planes and different data packets, namely, the data packet received by a functional plane submodule triggers the protocol unaware forwarding device to execute different functions, the received update data packet firstly enters the functional plane submodule to be processed, and the function to be executed is judged;
(3) the functional plane submodule decapsulates the update data packet according to the 'position + offset', and judges whether the functional plane ID field of the parsed update data packet is equal to 0x02, wherein 0x02 is a 16-system 8-bit code which is a Metadata data update functional plane code, and if so, the functional plane submodule enters the Metadata data update functional submodule;
(4) the Metadata data updating function sub-module judges the table ID field and the data ID field of the updating data packet, and locates the record on the corresponding Metadata table according to the two values, wherein the two values are the position information of the target Metadata data;
(5) the Metadata data updating function sub-module then judges the operation code, if the operation code is 0xfa, the operation code is an updating operation, 0xfa is a 16-system 8-bit code which is the code of the updating operation, the specific content to be updated uses the value of the 'data updating content' field of the data packet, if the operation code is 0x00, the operation code means the operation of restoring the default value, and the updated content comes from the local data;
(6) the Metadata data updating function sub-module copies the data updating content field of the data packet to a destination Metadata data area through a Metadata data content operation instruction set according to the destination Metadata data position information and the operation code obtained in the steps (4) and (5);
(7) after the update is completed, the Metadata data update function sub-module changes the ID value of the function plane ID field of the update data packet to be 0x01, wherein 0x01 is a 16-system 8-bit code and is a code of a routing function plane, after the function plane ID field of the update data packet is changed to be 0x01, the update data packet becomes a response data packet and is returned to the function plane sub-module, the function plane sub-module judges that the function plane ID of the response data packet is 0x01, 0x01 is a 16-system 8-bit code and is a code of the routing function plane, the response data packet is delivered to the routing function sub-module, and the routing function sub-module returns the response data packet to the client.
Compared with the prior art, the invention has the advantages that:
(1) the existing data packet receiving and transmitting technology adopts the traditional operating system drive and kernel protocol stack receiving and transmitting mode, and is characterized in that hard interrupt is adopted for communication, the data packet needs to be subjected to operations such as hard interrupt context switching, data copying between a kernel mode and a user mode and the like, a path from a network card to a service process is too long, and a large amount of CPU time consumption is generated. The invention utilizes DPDK technology to transmit and receive data packets, the DPDK driver shields the interruption of hardware, and an active polling mode is adopted in the user mode, thus the kernel can be bypassed to perform packet transmitting and receiving processing in the user mode, the advantages of zero copy and no system call are realized, and the consumption brought by context switching is reduced. Therefore, the invention has the characteristics of rapidness and high efficiency in the aspect of data packet receiving and sending.
(2) The existing data updating technology is mainly characterized in that a database system or a file system receives a user instruction and then updates data, and a large amount of system calls are needed from the instruction receiving process to the instruction completing process, so that system resources are consumed greatly. The invention utilizes the protocol non-sensing technology, adds the instruction supporting the modification of all the contents of the Metadata data by designing the protocol format of the data packet, the instruction enables the updating contents carried by the data packet to directly cover the appointed position of the Metadata, the equipment can directly carry out the data updating operation according to the received field value of the data packet, and the updating data carried by the data packet is directly covered to the local, thereby completing the updating task. The invention has simple process from receiving the instruction to finishing the instruction and less system consumption resources.
(3) Metadata data is stored in the memory, and the protocol unaware module can directly access the memory. Data access is faster than storage on a local hard disk.
(4) Compared with the existing data updating method, the method comprehensively adopts a DPDK transceiving technology, a data packet driving updating technology and a mode of storing Metadata data in the memory. The advantages of the three components enable the invention to have higher efficiency when dealing with large-scale data updating scenes.
Drawings
FIG. 1 is a functional block diagram of a protocol agnostic forwarding device of the present invention;
FIG. 2 is a deployment diagram of a protocol unaware forwarding data high-speed update system;
FIG. 3 is a diagram of update packet and reply packet protocol encapsulation formats;
fig. 4 is a diagram of an update method implementation process of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Interpretation of terms:
data packet: is the basic unit of data transmission in packet-switched networks. Consists of header control information and payload data. Protocol agnostic forwarding: the network forwarding equipment has no perception on the network protocol and the data packet processing and forwarding process, the operations of reading, writing, accessing and the like on the data packet are defined by a set of universal network instruction set, and the network instruction set flexibly defines the processing logic of the data packet. The data packet of the present invention includes an update data packet and an acknowledgement data packet.
Protocol agnostic forwarding device: the forwarding layer entity in the software defined network architecture comprises a plurality of flow tables, each flow table comprises a plurality of flow table entries, and each flow table entry expresses a rule for processing a data packet.
Metadata is data which is stored by the protocol unaware forwarding device and can be shared among flow table entries, and a user can query and update the data in the area through a protocol unaware technology.
As shown in fig. 1, the functional composition of the protocol unaware forwarding device in the present invention is as shown in fig. 1, and the protocol unaware forwarding module operates in a user mode as a module based on DPDK drive, and the module is composed of a functional plane sub-module, a Metadata data query function sub-module, a Metadata data update function sub-module, a flow table maintenance function sub-module, and a routing function sub-module. The functional plane submodule is responsible for judging the functional submodule triggered by the data packet according to the field value of the 'functional plane ID' of the data packet; the Metadata data updating function sub-module is responsible for updating the Metadata data area; the Metadata data updating function sub-module is responsible for updating the Metadata data area; the flow table maintenance function sub-module is responsible for modifying, issuing, deleting, reporting and other operations on the flow table items of the protocol-independent forwarding equipment; and the routing function sub-module is responsible for carrying out encapsulation and forwarding operations on the data packet of the protocol-independent forwarding equipment. All modules transmit and receive data packets by using a DPDK technology, the DPDK driver shields the interruption of hardware, and an active polling mode is adopted in a user mode to bypass a kernel for processing the packet transmission and reception in the user mode.
The deployment diagram of the system is shown in fig. 2, and the deployment mode adopts a client/server mode. One or more protocol unaware forwarding devices are used as a service end, and a user terminal is connected with the service end through a network.
The protocol non-sensing forwarding device is logically divided into a plurality of functional planes, namely a Metadata data updating functional plane, a flow table maintaining functional plane and a routing functional plane. The invention mainly uses Metadata data to update the functional plane. The invention utilizes the protocol non-sensing technology, and the equipment directly executes the corresponding function plane according to the field value of the received data packet by designing the protocol format of the data packet.
The updating method shown in fig. 4 is implemented as follows:
(1) the updating request of the client is packaged well according to the protocol format of the function plane ID, the table ID, the data ID, the operation code and the data updating content, and is used as an updating data packet and sent to the protocol unaware forwarding equipment;
(2) the protocol unaware forwarding module receives an update data packet sent by a client from a network card device in a DPDK-driven CPU polling mode, the protocol unaware forwarding device is provided with a plurality of functional planes and different data packets, namely, the data packet received by a functional plane submodule triggers the protocol unaware forwarding device to execute different functions, the received update data packet firstly enters the functional plane submodule to be processed, and the function to be executed is judged;
(3) the functional plane submodule decapsulates the update data packet according to the 'position + offset', and judges whether the functional plane ID field of the parsed update data packet is equal to 0x02, wherein 0x02 is a 16-system 8-bit code which is a Metadata data update functional plane code, and if so, the functional plane submodule enters the Metadata data update functional submodule;
(4) the Metadata data updating function sub-module judges the table ID field and the data ID field of the updating data packet, and locates the record on the corresponding Metadata table according to the two values, wherein the two values are the position information of the target Metadata data;
(5) the Metadata data updating function sub-module then judges the operation code, if the operation code is 0xfa, the operation code is an updating operation, 0xfa is a 16-system 8-bit code which is the code of the updating operation, the specific content to be updated uses the value of the 'data updating content' field of the data packet, if the operation code is 0x00, the operation code means the operation of restoring the default value, and the updated content comes from the local data;
(6) the Metadata data updating function sub-module copies the data updating content field of the data packet to a destination Metadata data area through a Metadata data content operation instruction set according to the destination Metadata data position information and the operation code obtained in the steps (4) and (5);
(7) after the update is completed, the Metadata data update function sub-module changes the ID value of the function plane ID field of the update data packet to be 0x01, wherein 0x01 is a 16-system 8-bit code and is a code of a routing function plane, after the function plane ID field of the update data packet is changed to be 0x01, the update data packet becomes a response data packet and is returned to the function plane sub-module, the function plane sub-module judges that the function plane ID of the response data packet is 0x01, 0x01 is a 16-system 8-bit code and is a code of the routing function plane, the response data packet is delivered to the routing function sub-module, and the routing function sub-module returns the response data packet to the client.
Aiming at some network data updating scenes with higher requirement on updating efficiency, such as mobile network user information updating, network ID (identity) and address real-time updating and the like, the invention realizes the decapsulation of the updating data packet, the data updating, the encapsulation of the response data packet and the like by utilizing a data plane protocol non-sensing forwarding technology, thereby achieving the aim of updating data at high speed.
The above examples are provided only for the purpose of describing the present invention, and are not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims. Various equivalent substitutions and modifications can be made without departing from the spirit and principles of the invention, and are intended to be within the scope of the invention.
Claims (2)
1. A high-speed data update system based on protocol unaware forwarding and corresponding protocol independent forwarding device, comprising: the system is based on a DPDK-driven protocol non-perception forwarding module, the protocol non-perception forwarding module is used as a module based on DPDK drive to operate in a user mode, and the protocol non-perception forwarding module comprises a functional plane sub-module, a Metadata data query function sub-module, a Metadata data update function sub-module, a flow table maintenance function sub-module and a routing function sub-module; the protocol unaware forwarding module based on DPDK drive utilizes DPDK development kit to realize that the sub-module under the module processes the data packet of the protocol independent forwarding device by reading the data packet from the network card hardware device in a polling way and bypassing the kernel of the operating system; metadata is data which is stored by the protocol unaware forwarding equipment and can be shared among flow table items, and a user can update the data through a protocol unaware technology and a Metadata data content operation instruction set; wherein:
the functional plane submodule receives a data packet carrying an updating instruction and judges the functional submodule triggered by the data packet according to the field value of the functional plane ID of the data packet; the function plane ID is an indication protocol unaware forwarding device, and the field of the data packet includes, in addition to the field of the function plane ID: table ID, data ID, opcode, and data update content; the table ID indicates the table to which the data to be updated belongs; the data ID indicates the index of the data to be updated in the table indicated by the table ID; the operation code indicates an operation to be performed on the data; the data updating content refers to the updating content of the stored data;
the Metadata data query function sub-module is responsible for performing query operation on a Metadata data area;
the Metadata data updating function sub-module is responsible for updating the Metadata data area; the module is provided with a Metadata data content operation instruction set supporting the modification of all contents of Metadata data, and the instruction set enables the updating contents carried by the data packet to directly cover the designated position of the Metadata so as to complete the updating task;
the flow table maintenance function sub-module is responsible for modifying, issuing, deleting and reporting the flow table items of the protocol-independent forwarding equipment; the flow table entry is a basic composition of a protocol unaware forwarding device, the protocol unaware forwarding device comprises a plurality of flow tables, and each flow table comprises a plurality of flow table entries;
and the routing function sub-module is responsible for packaging and forwarding the response data packet of the protocol-independent forwarding equipment.
2. A high-speed data updating method based on protocol unaware forwarding is characterized by comprising the following steps:
(1) the updating request of the client is packaged well according to the protocol format of the function plane ID, the table ID, the data ID, the operation code and the data updating content, and is used as an updating data packet and sent to the protocol unaware forwarding equipment;
(2) the protocol unaware forwarding module receives an update data packet sent by a client from a network card device in a DPDK-driven CPU polling mode, the protocol unaware forwarding device is provided with a plurality of functional planes and different data packets, namely, the data packet received by a functional plane submodule triggers the protocol unaware forwarding device to execute different functions, the received update data packet firstly enters the functional plane submodule to be processed, and the function to be executed is judged;
(3) the functional plane submodule decapsulates the update data packet according to the 'position + offset', judges whether the analyzed functional plane ID field of the update data packet is the code of the Metadata data update functional plane, and enters the Metadata data update functional submodule if the analyzed functional plane ID field of the update data packet is the code of the Metadata data update functional plane;
(4) the Metadata data updating function sub-module judges the table ID field and the data ID field of the updating data packet, and locates the record on the corresponding Metadata table according to the two values, wherein the two values are the position information of the target Metadata data;
(5) the Metadata data updating function sub-module then judges the operation code, if the operation code is the code of the updating operation, the updated specific content uses the value of the 'data updating content' field of the data packet, and if the operation code is the code for recovering the default value, the updated content is from the local default data;
(6) the Metadata data updating function sub-module copies the data updating content field of the data packet to a destination Metadata data area through a Metadata data content operation instruction set according to the destination Metadata data position information and the operation code obtained in the steps (4) and (5);
(7) after the updating is finished, the Metadata data updating function submodule changes the ID value of the function plane ID field of the updating data packet into the code of the routing function plane, the updating data packet becomes a response data packet after the function plane ID field of the updating data packet is changed into the code of the routing function plane, the response data packet is returned to the function plane submodule, the function plane submodule judges that the function plane ID of the response data packet is the code of the routing function plane, the response data packet is delivered to the routing function submodule, and the routing function submodule returns the response data packet to the client.
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