CN101540720B - Zero-copy method for supporting link aggregation of multi-type network cards - Google Patents

Zero-copy method for supporting link aggregation of multi-type network cards Download PDF

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Publication number
CN101540720B
CN101540720B CN2008101146908A CN200810114690A CN101540720B CN 101540720 B CN101540720 B CN 101540720B CN 2008101146908 A CN2008101146908 A CN 2008101146908A CN 200810114690 A CN200810114690 A CN 200810114690A CN 101540720 B CN101540720 B CN 101540720B
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message
buffering area
interface
interface layer
equipment
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CN101540720A (en
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曾宇
历军
聂华
刘朝辉
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Dawning Information Industry Beijing Co Ltd
Dawning Information Industry Co Ltd
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Abstract

The invention relates to a zero-copy packing method, in particular to a zero-copy method capable of supporting multi-type network cards and realizing link aggregation. The zero-copy method comprises the following steps: A. a device interface is opened through an interface layer function in a buffer area; B. the buffer area is positioned in a user space; C. a buffer area queue is constructed; D. the interface layer function is mapped to the information of the control structure of the buffer area through an internal memory; E. the device interface is opened through a message interface layer function; and F. a newly established message pointer queue is applied, the message pointer is extracted out from the buffer area to put in the message pointer queue, and the message data in the message pointer queue is applied for processing. Due to the adoption of the layered structure, the prior application interface layer is divided into a buffer area interface layer being regardless of the buffer area structure of the concrete device and a message interface layer for extracting the message from the buffer area, the purpose for using the multi-type network cards in a mixed manner is achieved, and the software is convenient for transportation and the extension.

Description

A kind of Zero-copy method of supporting link aggregation of multi-type network cards
Technical field
The present invention relates to a kind of zero-copy and catch the bag method, specifically a kind of Zero-copy method of supporting multi-type network cards, realizing the link aggregation function.
Background technology
In high speed network environment, to intercept, the application software of work such as detection needs message capturing mode efficiently, and just zero-copy is caught packet mode, catches in the bag software at traditional zero-copy, generally adopts kernel to drive and the application interface library double-layer structure.Kernel drives is responsible for writing message in message buffer, application interface library is responsible for message buffer is submitted to application, after application software is handled message, can discharge buffering area by application interface library again, so that driving, kernel writes new message to buffering area.
In traditional zero-copy software, be applied in and catch when bag on the network interface card when one, use by zero-copy interface library and buffering area formation of kernel buffers co-operate.But along with the enhancing of CPU computing capability, a present station server has had the ability to handle the flow on the polylith network interface card, so need zero-copy software that the link aggregation function is provided, the flow of a plurality of network interface cards is aggregated into a data flow submit to application software.
The conventional method of realizing link aggregation is, set up a series of buffer queues in interface library, corresponding each network card equipment has a formation, when interface library to using when submitting message buffer to, interface library carries out poll to each network interface card, and seeks a buffering area and give application; When using the buffer release district, which network interface card interface library belongs to according to the position calculation buffering area of buffering area, buffering area is put into the idle queues of this network interface card.
Development along with application demand, the bad shortcoming of extensibility has appearred in the prior art scheme, because the message on a lot of High Speed Network is handled the network interface card hardware of the special customization of application need, on these customization network interface cards, often to do some preliminary treatment to original network message, commonly strengthen an extra data structure in original message structure front, perhaps a plurality of small messages amalgamations in a buffering area.Because the message structure difference that network interface card is uploaded is wrapped in different catching, in the existing technical scheme, application interface library is handled with message buffering area as consistent data structure, cause a socket storehouse on one type network card equipment, to use, can't solve one and use the problem of using multiple network interface card.
Summary of the invention
The objective of the invention is to resolve the shortcomings of the prior art solutions, thereby provide a kind of by catching the Zero-copy method that hierarchy that the bag application-interface layer is divided into buffering area interface layer and message interface layer realizes providing to the polymerization of the message of multi-type network cards, to application additional functions such as shunting, filtration with of the prior art.
For achieving the above object, the present invention is achieved through the following technical solutions: a kind of Zero-copy method of supporting link aggregation of multi-type network cards comprises the steps:
A) the buffering area interface layer function that provides of application call interface library is opened equipment interface, and each network interface card is specified a type number that is used to distinguish dissimilar network interface cards, with all types of number records in the device type tabulation; In driving, the kernel of each network interface card all increases a system call command that is used to return network interface card type number;
B) the equipment interface function of opening that the buffering area interface layer provides is applied for the continuous internal memory of a slice as buffering area in user's space, and the buffering area first address is passed to the kernel driving;
C) kernel drives the control structure that the continuous page of application is constructed the buffering area formation, and the physical address of control structure is passed to buffering area interface layer function;
D) interface function is according to the address of buffer control structure, obtains information in the buffer control structure by memory-mapped;
E) the message interface layer functions that provides of application call interface library is opened equipment interface, obtain the type number of each network card equipment by the system call command of each network card equipment, and the device type list records that will write down all numbers is in a global data structures, and the message interface layer is operated the buffering area of respective wire card apparatus according to the type number;
F) be the newly-built message pointer alignment of application in user's space, the message pointer that will extract from buffering area is put into the message pointer alignment, and application program is handled the message data in the message pointer alignment.
The size of buffering area is 2KB among the described step B, for guaranteeing to be positioned on the continuous memory pages, save as shared drive in the application of interface library function, because in linux operating system at the buffering area of user's space application, shared drive is positioned on the continuous physical page, and concrete operations are:
B1) the interface library function is asked shared buffer in user's space, and is connected to shared buffer;
B2) the interface library function is passed to the kernel driving to the first address of shared buffer by the ioctl system call command.
B3) kernel drives the physical address that calculates each buffering area in the buffering area formation, and described address is kept in the physical address table so that DMA uses;
Buffer control structure among the described step C comprises the buffering area formation, and this formation comprises idle queues, receive the buffering area formation, describe the normal mode that drives mode of operation and direct copy mode, is used for the variable etc. that process reaches mutual exclusion synchronously.
The concrete steps of described step D are:
D1) the user interface built-in function obtains the physical address of the buffering area formation control structure of structure in the kernel driving from the data structure that system call is returned;
D2) the user interface built-in function is opened the memory device file;
D3) the user interface built-in function is mapped to the buffer control structure in the kernel by system call the address space of oneself.
The concrete steps of described step F are:
F1) the message interface layer provides opens equipment interface function newly-built message pointer alignment in user's space;
F2) message in message interface storehouse extracts function by the structure in the buffering area of each network interface card of device type tabulation judgement, thereby extracts the message pointer, puts into the message pointer alignment.
F3) message obtains interface function and obtain the message pointer alignment from global data structures;
F4) when obtaining message interface and be employed routine call, the message interface layer functions takes out a message from receive the message pointer alignment, the buffering area interface layer continues each message of location from the buffering area that fills up message, deposits the reception message pointer alignment of message interface layer in to extract message first address pointer.
When F5) after message is employed program and uses, promptly discharging message interface and be employed routine call, the message interface layer functions inserts a message in discharging the message pointer alignment, the buffering area interface layer is passed to corresponding network card equipment to the buffering area that has discharged message by driving, and waits for that network card equipment writes message once more in buffering area.
Described global data structures is constructed at continuous internal memory of user's space application, and its member comprises reception message pointer alignment and discharges the message pointer alignment.
The beneficial effect that the present invention brought is:
1, the present invention passes through hierarchy, the existing application interface layer is divided into buffering area interface layer and message interface layer, the buffering area interface layer is indifferent to the buffering area structure of concrete equipment, the message interface layer extracts message according to device type from buffering area, the message data stream of distinct device can be combined into a data flow in the message interface strata like this, realizes mixing on same the machine and uses polytype network interface card.
2, the present invention has realized the code of interface library at distinct device by adopting hierarchy, has only message interface layer difference, can make things convenient for the transplanting and the expansion of software.
Description of drawings
Fig. 1 is the structural representation of application-interface layer, is the application-interface layer of prior art in the frame of broken lines among the figure, among the present invention it is split as buffering area interface layer and message interface layer;
Fig. 2 is a schematic flow sheet of realizing Zero-copy method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, (network interface card A and network interface card B) is that the invention will be further described for example with two types of network interface cards.
As shown in Figure 1, the present invention passes through hierarchy, the bag application-interface layer of catching of existing zero duplication technology is divided into buffering area interface layer and message interface layer, the notion of in the buffering area interface layer, having only buffering area, only operate at a network equipment and a buffering area formation, no longer be concerned about the data structure in the buffering area, buffering area interface layer A is towards network interface card A, and buffering area interface layer B is towards network interface card B; The message interface aspect is to application, uses the device type tabulation, and the buffering area of each equipment is obtained and releasing operation, message structure extracted from buffering area, and carry out the polymerization of the message of many network interface cards.
Fig. 2 is for realizing the overview flow chart of Zero-copy method of the present invention.
A) the buffering area interface layer function that provides of application call interface library is opened equipment interface, each network interface card is specified a type number that is used to distinguish dissimilar network interface cards, the device type tabulation is an overall array dev-type[], every kind equipment has a type number that the overall situation is unique, the type number of setting network interface card A is 1, the style number of network interface card B is 2, so just writes down dev_type[A in the device type tabulation]=1, dev_type[B]=2.In the driving of network interface card A and network interface card B, all provide the ioctl interface, GET_DEV_TYPE is provided in the ioctl interface order, the type number of this order Returning equipment, the function of user's space can obtain the type number of respective wire card apparatus by using the ioctl interface of GET_DEV_TYPE command calls network interface card A and network interface card B.
B) the equipment interface function of opening that the buffering area interface layer provides is applied for the continuous internal memory of a slice as message buffer in user's space, and the buffering area first address is passed to the kernel driving.In this step, the maximum shared drive value of check system initial setting up, if the request memory value is greater than system default shared drive value, then the system default memory value is made amendment, distribute shared drive according to required memory size, after successfully returning the initial address of internal memory, just can internally deposit into row and preserve data or lock operation.After using internal memory, this internal memory is returned to system.
The round-robin queue that the buffering area formation is made up of the pointer of a series of sensing buffering areas, kernel drives respectively and take out freebuf from buffering row A of sector and the buffering row B of sector, the message of network interface card A is sent in the freebuf among the buffering area formation A, the message of network interface card B is sent to freebuf among the buffering area formation B.
C) at first kernel drives the size of calculating the buffer control structure of needs according to the size of whole buffering area formation, secondly kernel drives the control structure that the continuous page of application is constructed the buffering area formation, kernel drives the physical address that calculates each buffering area in the buffering area formation once more, be kept in the physical address table so that DMA uses, last kernel drives the physical address that calculates buffering area formation control structure and passes to buffering area interface layer function.
The member of buffer control structure comprises: buffering area formation, the structure of this formation comprise idle queues, receive the buffering area formation, describe the normal mode that drives mode of operation and direct copy mode, is used for the variable etc. that process reaches mutual exclusion synchronously.The control handle is when carrying out initialization, converts the first address of each block buffer the physical address of kernel spacing to, and promptly the required address of dma operation is stored in the physical address table.
D) at first, buffering area interface library interface function obtains the physical address of the buffering area formation control structure of structure in the kernel driving from system call return data structure; Secondly, open memory device file/dev/mem; At last, by system call mmap the buffer control structure in the kernel is mapped to the address space of oneself.
E) the message interface layer functions that provides of application call interface library is opened equipment interface, obtain the type number of each network card equipment by the ioctl system call command of each network card equipment, and the device type list records that will write down all numbers is in a global data structures, and the message interface layer is operated the buffering area of respective wire card apparatus according to the type number.
As global data structures, its member comprises reception message pointer alignment and discharges the message pointer alignment at continuous internal memory of user's space application.
Function by the message interface layer finds each network card equipment in the network card equipment tabulation, and the function that calls the buffering area interface layer of these network card equipments is opened equipment interface, obtain the type number of each network card equipment by the ioctl system call command of each network card equipment, device type list records that will all numbers of record is in global data structures.
F) at first, the message interface layer provides opens equipment interface function newly-built message pointer alignment in the data structure of user's space, and the queue element (QE) in the described message pointer alignment is the pointer that points to each message, and these messages obtain from a plurality of distinct devices.The message in message interface storehouse extracts function by the structure in the buffering area of device type tabulation judgement network interface card A and network interface card B, thereby extracts the message pointer, puts into the message pointer alignment;
Message obtains interface function and obtain the message pointer alignment from global data structures, when obtaining message interface and be employed routine call, the message interface layer functions takes out a message from receive the message pointer alignment, application program is just carried out respective handling to this message, this moment, the buffering area interface layer continued each message of location from the buffering area that fills up message, deposited the reception message pointer alignment of message interface layer in to extract message first address pointer; When after message is employed program and uses, promptly discharging message interface and being employed routine call, the message interface layer functions inserts a message in discharging the message pointer alignment, this moment, the buffering area interface layer was passed to corresponding network card equipment to the buffering area that has discharged message by driving, and waited for that network card equipment writes message once more in buffering area.
Application program can constantly be obtained the message pointer from the message pointer alignment, the message data that be extracted this moment just can form a data flow, to realize the polymerization of data.
Embodiment 2
The structure of present embodiment and operating procedure basic with embodiment 1, having difference only is, the size of each buffering area is 2KB among the described step B, for guaranteeing to be positioned on the continuous memory pages at the buffering area of user's space application, save as shared drive in the application of interface library function, because in linux operating system, shared drive is positioned on the continuous physical page.Concrete operations are:
B1), and be connected to shared buffer at interface library function application shared buffer.
B2) the interface library function is passed to the kernel driving to the first address of shared buffer by the ioctl system call command.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the field's English is when understanding: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (6)

1. a Zero-copy method of supporting link aggregation of multi-type network cards is characterized in that, described method comprises the steps:
A) the buffering area interface layer function that provides of application call interface library is opened equipment interface, and each network interface card is specified a type number that is used to distinguish dissimilar network interface cards, with all types of number records in the device type tabulation; In driving, the kernel of each network interface card all increases a system call command that is used to return network interface card type number;
B) the equipment interface function of opening that the buffering area interface layer provides is applied for the continuous internal memory of a slice as buffering area in user's space, and the buffering area first address is passed to the kernel driving;
C) kernel drives the continuous page of application and constructs buffer control structure, and the physical address of control structure is passed to open the equipment interface function;
D) open the physical address of equipment interface function, obtain information in the buffer control structure by memory-mapped according to buffer control structure;
E) the message interface layer functions that provides of application call interface library is opened equipment interface, obtain the type number of each network card equipment by the system call command of each network card equipment, and the device type list records that will write down all types number is in a global data structures, and the message interface layer is operated the buffering area of respective wire card apparatus according to the type number;
F) be the newly-built message pointer alignment of application in user's space, the message pointer that will extract from buffering area is put into the message pointer alignment, and application program is handled the message data in the message pointer alignment.
2. Zero-copy method according to claim 1, it is characterized in that, the size of buffering area is 2KB among the described step B, for guaranteeing to be positioned on the continuous memory pages at the buffering area of user's space application, open the application of equipment interface function in save as shared drive, because in linux operating system, shared drive is positioned on the continuous physical page, and concrete operations are:
B1) open the equipment interface function at user's space application shared buffer, and be connected to shared buffer;
B2) open the equipment interface function first address of shared buffer is passed to the kernel driving by the ioct1 system call command;
B3) kernel drives the physical address that calculates each buffering area in the buffering area formation, and described address is kept in the physical address table so that DMA uses.
3. Zero-copy method according to claim 1, it is characterized in that: the buffer control structure among the described step C comprises the buffering area formation, describes normal mode and the direct copy mode that drives mode of operation and is used for the variable that process reaches mutual exclusion synchronously that described buffering area formation comprises idle queues and receives the buffering area formation.
4. Zero-copy method according to claim 1 is characterized in that, the concrete steps of described step D are:
D1) open the equipment interface function obtains the buffer control structure of structure in the kernel driving from the data structure that system call is returned physical address;
D2) open the equipment interface function and open the memory device file;
D3) open the equipment interface function and the buffer control structure in the kernel is mapped to the address space of oneself by system call.
5. Zero-copy method according to claim 1 is characterized in that, the concrete steps of described step F are:
F1) the message interface layer provides opens equipment interface function newly-built message pointer alignment in user's space;
F2) message of message interface layer obtains interface function by the structure in the buffering area of each network interface card of device type tabulation judgement, thereby extracts the message pointer, puts into the message pointer alignment;
F3) message obtains interface function and obtain the message pointer alignment from global data structures;
F4) when obtaining message interface and be employed routine call, the message interface layer functions takes out a message from receive the message pointer alignment, the buffering area interface layer continues each message of location from the buffering area that fills up message, deposits the reception message pointer alignment of message interface layer in to extract message first address pointer;
When F5) after message is employed program and uses, promptly discharging message interface and be employed routine call, the message interface layer functions inserts a message in discharging the message pointer alignment, the buffering area interface layer is passed to corresponding network card equipment to the buffering area that has discharged message by driving, and waits for that network card equipment writes message once more in buffering area.
6. Zero-copy method according to claim 1 or 5, it is characterized in that: described global data structures is constructed at continuous internal memory of user's space application, its member comprises and receives the message pointer alignment and discharge the message pointer alignment.
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