CN101917350A - Network card drive-based zero copy Ethernet message capturing and transmitting implementation method under Linux - Google Patents
Network card drive-based zero copy Ethernet message capturing and transmitting implementation method under Linux Download PDFInfo
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- CN101917350A CN101917350A CN2010102796065A CN201010279606A CN101917350A CN 101917350 A CN101917350 A CN 101917350A CN 2010102796065 A CN2010102796065 A CN 2010102796065A CN 201010279606 A CN201010279606 A CN 201010279606A CN 101917350 A CN101917350 A CN 101917350A
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Abstract
The invention discloses a network card drive-based zero copy Ethernet message capturing and transmitting implementation method under Linux. The method comprises the following steps of: 1, mapping the whole physical memory to a user process space by using a user process; 2, managing message received by a message driving module and message to be transmitted by the message driving module in a queue mode; 3, isolating the influence of discrimination of various network card drives on the user process by using the message driving module; and 4, after the various network card drives are loaded successfully, registering equipment and related operating methods to the message driving module. The method is implemented layer by layer so that the method can simultaneously support multiple types of network cards and is easy to add support for new network cards. The method can realize high-performance message capture and transmission without one-time copy in the message capture and transmission process, and is suitable for the situations with high requirement for transceiving of the message such as network traffic monitoring and analysis and the like.
Description
Technical field
The present invention relates to realize in a kind of linux system the method for transmitting-receiving bag at a high speed, especially a kind ofly send out the transmitting-receiving bag method of zero-copy in the transmitting-receiving process, the implementation method of the zero-copy Ethernet message capturing and sending that drive based on network interface card under specifically a kind of Linux at newspaper.
Background technology
In network service monitoring and flow analysis etc. are used, need to realize that the high performance of big flow catches or send message, usually modes such as the socket that adopts and the libpcap performance of catching and sending of carrying out message often do not reach the desired performance requirement of system, become the performance bottleneck in the whole system.These general schemes arrive network interface card at message, after having the network interface card driving to receive message, can carry out a large amount of processing and repeatedly copy, comprise the copy that carries out message from kernel state to user's space, though these operations have guaranteed good versatility, also caused the demand of the discontented pedal system of its performance.
Summary of the invention
The objective of the invention is to copy repeatedly just and can finish the problem that the transmitting-receiving process causes speed to be difficult to improve, invent the implementation method of the zero-copy Ethernet message capturing and sending that drive based on network interface card under a kind of Linux at existing packet sending and receiving Bao Junxu.
Technical scheme of the present invention is:
The implementation method of the zero-copy Ethernet message capturing and sending that drive based on network interface card under a kind of Linux is characterized in that it may further comprise the steps:
At first, foundation is caught and is wrapped formation in kernel state message driver module, message discharges formation, packet buffer formation and transmit queue with the management of realization to message, and creates corresponding message and fill thread, message release thread and message transmission thread;
Secondly, when loading the network interface card driving and opening corresponding network card equipment, carry out the network card equipment registration to aforementioned message driver module immediately, obtain corresponding message transmission interface;
The 3rd, in consumer process, whole physical memory is mapped to user's space, make directly travel all over physical memory of consumer process;
The 4th, when consumer process need carry out message capturing or send, by under the Linux /proc file item mode notifies kernel state message driver module to carry out initial work, create the initial configuration of respective resources and recording user process, after the initialization success, consumer process gets final product the process message capturing and sending;
At last, adopt physical address between user's attitude and kernel state, to carry out data interaction, physical address translations with user's attitude in the use of user's attitude is a virtual address, when the kernel state use, it is converted to kernel virtual address with the physical address of kernel state, to realize the Ethernet message capturing and sending of zero-copy.
Described message is filled thread and is responsible for applying for packet buffer, and the physical address of message pointer is put into the packet buffer formation; Described message discharges responsible taking-up of thread and waits to discharge the message pointer from message release formation, and respective cache discharges; Described message sends responsible taking-up of thread and waits to discharge the message pointer from the message transmit queue, and this message is sent; When network interface card receives message, network interface card drives message up sending to the message driver module, and the message driver module is put into the physical address of message pointer and caught the bag formation accordingly.
Described consumer process by the dmesg log-on message or/the proc/iomem file gets access to the maximum of current physical address, and the memory size that use in the current process space is set to unrestrictedly (being that the spendable memory size in current process space does not have upper limit setting), according to the maximum physical address use mmap that gets access to whole physical memory is mapped to the consumer process space simultaneously.
Described kernel message driver module register initialization/proc file item and reading/writing method thereof opened initialization/proc file item by consumer process then, and write the initial configuration item in described initialization/proc file item; After kernel state message driver module gets access to initial configuration, distribute respective resources, be provided with and catch the bag configuration; After the kernel initialization success, consumer process obtains the mapping respective resources to user's space, and then message be caught and be sent to consumer process can by respective resources.
Described message capturing method is: when message arrives network interface card, network interface card drives and receives message and will deliver to the message driver module on it, the message driver module is put into the physical address of message and is caught the bag formation, consumer process is got the physical address of message from catch the bag formation, be converted to the virtual address in consumer process space, can realize visit message data.
Described file transmitting method is: when consumer process need send message, at first from the packet buffer formation, take out the physical address of a packet buffer, be converted to the virtual address of consumer process, the message content that filling will send, then this message physical address is put into corresponding transmit queue, kernel message driver module takes out the physical address of message to be sent from transmit queue, be converted into the kernel state virtual address, call the transmission interface of network card equipment, this message can be sent.
Beneficial effect of the present invention:
The present invention directly drives the message that receives with network interface card and is delivered to user's space, middle without any copy, the message that consumer process also can send is directly delivered to network interface card driving the carrying out transmission of message, middle also without any copy, thereby improved catching and transmission rate of message greatly, can satisfy application such as network service monitoring and flow analysis preferably has high performance requirement to message capturing and sending.
The present invention adopts consumer process to shine upon whole physical memory, adopt physical address between kernel state and user's attitude, to carry out memory shared, thereby realize that consumer process directly captures the message that the network interface card driving receives in the kernel, and directly in consumer process, will send message and drive by network interface card and send, data copy between the normal kernel state that saves and the user's attitude, and the Linux protocol stack is to the handling process of the complexity of message, thereby that has improved message greatly catches and sends performance, and has reduced the consumption of CPU.To test, and go up this method of use at IBM x3650M2 server (CPU is Xeon X556 * 2, internal memory 16GB) and carry out the message forwarding performance that the message forwarding can reach 3.8Gbps, and CPU consume less than 10%.Therefore, the present invention can satisfy the high performance requirements of application such as network flow monitoring and analysis to the transmitting-receiving of message, and can use less resource to reach this purpose, thereby can not influence the use of upper layer application to resource substantially.The present invention adopts layering to realize, makes this method can support polytype network interface card simultaneously, and is easy to add the support to new network interface card.
The present invention adopts layering to realize, makes this method can support polytype network interface card simultaneously, and is easy to add the support to new network interface card.
The present invention message catch with process of transmitting in do not have a copy, can realize high performance message capturing and sending, be applicable to the sight that network flow monitoring and analysis etc. have high requirements to the performance of the transmitting-receiving of message.
Description of drawings
Fig. 1 is the frame structure schematic diagram of implementation method of the present invention.
Fig. 2 is the course of work schematic diagram of kernel state message driver module of the present invention.
Fig. 3 is a net card loading registration process schematic diagram of the present invention.
Fig. 4 is mapped to the specific operation process schematic diagram of user's space for physical memory of the present invention.
Fig. 5 is that kernel state message of the present invention drives mould initialization procedure schematic diagram.
Fig. 6 is a schematic flow sheet of catching packet voice of the present invention.
Fig. 7 is the schematic flow sheet of transmission message of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Shown in Fig. 1-7.
The implementation method of the zero-copy Ethernet message capturing and sending that drive based on network interface card under a kind of Linux, it may further comprise the steps:
A, set up in kernel state message driver module and catch the bag formation, message discharges formation, and packet buffer formation and transmit queue are realized the management to message, and create corresponding message and fill thread, and message discharges thread and sends thread;
Linux system at first loads kernel message driver module after starting, and this module is responsible for message is directly transmitted between user's space and network interface card driving, and omits complex process between the two.Its concrete operations step as shown in Figure 2.
B, when loading that corresponding network interface card drives and network card equipment is opened, can carry out device registration to the message driver module, and corresponding message transmission interface;
When network interface card drives after the success of message driver module device registration, the message driver module will get access to the device pointer of corresponding network interface card, the message driver module can obtain the network card equipment association attributes by this pointer, and attribute is provided with interface and sends message interface by this network interface card.Its concrete operations step as shown in Figure 3.
C, in consumer process, whole physical memory is mapped to user's space, make consumer process can between the travel all over physical memory;
When consumer process shines upon whole physical memory after the process space, consumer process can directly have access to this physical memory, and virtual address of using in the linux kernel and physical address are one-to-one relationship, the kernel network interface card drives the message that receives, be stored in the kernel spacing, can realize direct visit as long as consumer process is obtained the physical address of this message, can realize too the kernel and the consumer process of queue resource are shared, operate simultaneously this message.The present invention utilizes this corresponding relation to realize the zero-copy of message for the basis to catch and send.Its concrete operations step as shown in Figure 4.
D, when consumer process need carry out message capturing or send, by under the Linux /proc file item mode notifies the kernel message driver module initial work of being correlated with, create the initial configuration of respective resources and recording user process, after the initialization success, consumer process gets final product the process message capturing and sending;
Kernel message driver module promptly can be registered corresponding PROC file item when loading, for consumer process provides interface to the registration of kernel message driver module.A kind of mode that PROC file item under the Linux is user's attitude and kernel state carries out data interaction.Its concrete operations step as shown in Figure 5.
All adopting physical address when carrying out data interaction between E, user's attitude and the kernel state, when using in user's attitude, be virtual address with physical address translations, when kernel state uses, also will be converted into kernel virtual address.
When message arrives network interface card, network interface card drives and receives message and will deliver to the message driver module on it, the message driver module is put into the physical address of message and is caught the bag formation, consumer process is got the physical address of message from catch the bag formation, be converted to the virtual address in consumer process space, can realize the visit to message data, its concrete operations step as shown in Figure 6.
When consumer process need send message, at first from the packet buffer formation, take out the physical address of a packet buffer, be converted to the virtual address of consumer process, the message content that filling will send, then this message physical address is put into corresponding transmit queue, kernel message driver module takes out the physical address of message to be sent from transmit queue, be converted into the kernel state virtual address, call the transmission interface of network card equipment, this message can be sent, its concrete operations step as shown in Figure 7.
The frame structure of implementation method of the present invention as shown in Figure 1, it is made up of bottom (comprising all types of network interface cards), core layer (comprising that the message driver module of kernel state and all types of network interface card drive), exchange layer (physical memory) and working lining (consumer process).
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some deduction or replace, all should be considered as belonging to protection scope of the present invention.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (6)
1. the implementation method of the zero-copy Ethernet message capturing and sending that drive based on network interface card under the Linux is characterized in that it may further comprise the steps:
At first, foundation is caught and is wrapped formation in kernel state message driver module, message discharges formation, packet buffer formation and transmit queue with the management of realization to message, and creates corresponding message and fill thread, message release thread and message transmission thread;
Secondly, when loading the network interface card driving and opening corresponding network card equipment, carry out the network card equipment registration to aforementioned message driver module immediately, obtain corresponding message transmission interface;
The 3rd, in consumer process, whole physical memory is mapped to user's space, make directly travel all over physical memory of consumer process;
The 4th, when consumer process need carry out message capturing or send, by under the Linux /proc file item mode notifies kernel state message driver module to carry out initial work, create the initial configuration of respective resources and recording user process, after the initialization success, consumer process gets final product the process message capturing and sending;
At last, adopt physical address between user's attitude and kernel state, to carry out data interaction, physical address translations with user's attitude in the use of user's attitude is a virtual address, when the kernel state use, it is converted to kernel virtual address with the physical address of kernel state, to realize the Ethernet message capturing and sending of zero-copy.
2. the implementation method of the zero-copy Ethernet message capturing and sending that drive based on network interface card under the Linux according to claim 1, it is characterized in that described message fills thread and be responsible for applying for packet buffer, and the physical address of message pointer is put into the packet buffer formation; Described message discharges responsible taking-up of thread and waits to discharge the message pointer from message release formation, and respective cache discharges; Described message sends responsible taking-up of thread and waits to discharge the message pointer from the message transmit queue, and this message is sent; When network interface card receives message, network interface card drives message up sending to the message driver module, and the message driver module is put into the physical address of message pointer and caught the bag formation accordingly.
3. the implementation method of the zero-copy Ethernet message capturing and sending that drive based on network interface card under the Linux according to claim 1, it is characterized in that described consumer process by the dmesg log-on message or/the proc/iomem file gets access to the maximum of current physical address, and the memory size that use in the current process space is set to unrestrictedly, according to the maximum physical address use mmap that gets access to whole physical memory is mapped to the consumer process space simultaneously.
4. the implementation method of the zero-copy Ethernet message capturing and sending that drive based on network interface card under the Linux according to claim 1, it is characterized in that described kernel message driver module register initialization/proc file item and reading/writing method thereof, open initialization/proc file item by consumer process then, and in described initialization/proc file item, write the initial configuration item; After kernel state message driver module gets access to initial configuration, distribute respective resources, be provided with and catch the bag configuration; After the kernel initialization success, consumer process obtains the mapping respective resources to user's space, and then message be caught and be sent to consumer process can by respective resources.
5. the implementation method of the zero-copy Ethernet message capturing and sending that drive based on network interface card under the Linux according to claim 1, it is characterized in that described message capturing method is: when message arrives network interface card, network interface card drives and receives message and will deliver to the message driver module on it, the message driver module is put into the physical address of message and is caught the bag formation, consumer process is got the physical address of message from catch the bag formation, be converted to the virtual address in consumer process space, can realize visit message data.
6. the implementation method of the zero-copy Ethernet message capturing and sending that drive based on network interface card under the Linux according to claim 1, consumer process it is characterized in that described file transmitting method is: when need send message, at first from the packet buffer formation, take out the physical address of a packet buffer, be converted to the virtual address of consumer process, the message content that filling will send, then this message physical address is put into corresponding transmit queue, kernel message driver module takes out the physical address of message to be sent from transmit queue, be converted into the kernel state virtual address, call the transmission interface of network card equipment, this message can be sent.
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