CN106201697B - Interrupt processing method and system and programmable interrupt controller - Google Patents
Interrupt processing method and system and programmable interrupt controller Download PDFInfo
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Abstract
The invention discloses an interrupt processing method, a system and a programmable interrupt controller, wherein the method is applied to the programmable interrupt controller, and is preset with a corresponding relation between an interrupt processing CPU and a network card, and the method comprises the following steps: receiving an interrupt processing request from any network card, wherein the interrupt processing request is used for requesting to process any data packet received by the network card; and inquiring an interrupt processing CPU corresponding to the network card in the corresponding relation between the interrupt processing CPU and the network card, and forwarding an interrupt processing request to the interrupt processing CPU so that the interrupt processing CPU can process the data packet. The interrupt processing CPU and the network card have a corresponding relation, each interrupt processing CPU is only used for processing the interrupt processing request of the network card having the corresponding relation, when the interrupt processing request from the network card is received, the NAPI example currently operated by the interrupt processing CPU is very likely to be the NAPI example corresponding to the network card, NAPI example switching is not needed at the moment, and the processing resources of the interrupt processing CPU are saved.
Description
Technical Field
The invention relates to the field of data processing, in particular to an interrupt processing method, an interrupt processing system and a programmable interrupt controller.
Background
At present, network data forwarding devices such as firewall devices distribute interrupts from network cards in an evenly distributed manner, that is, interrupts are distributed to CPUs in turn in sequence for processing. Although this way of evenly distributing interrupts can reasonably bypass interrupts and prevent the problem of excessive stress on individual CPUs, it also has its drawbacks.
Because the CPUs need to execute the poll function of the NAPI instance corresponding to the network card when processing the interrupt of the network card, if the above-mentioned average distribution mode is used, each CPU may process the interrupt of any one network card, so each CPU may run the NAPI instances of all the network cards.
In addition, when the CPU processes the interrupts of different network cards, it needs to execute the corresponding network card NAPI instances hung on the CPU in turn, and there is an operation of locking and unlocking when executing each NAPI instance. When each CPU needs to process the interrupts of all network cards, such frequent locking and unlocking operations will certainly consume a lot of processing resources of the CPU.
Disclosure of Invention
The invention provides an interrupt processing method, an interrupt processing system and a programmable interrupt controller, which can reduce the consumption of CPU processing resources to a certain extent.
The invention provides an interrupt processing method, which is applied to a programmable interrupt controller, wherein the programmable interrupt controller is preset with a corresponding relation between an interrupt processing CPU and a network card, and the method comprises the following steps:
receiving an interrupt processing request from any network card, wherein the interrupt processing request is used for requesting to process any data packet received by the network card;
and inquiring an interrupt processing CPU corresponding to the network card in the corresponding relation between the interrupt processing CPU and the network card, and forwarding the interrupt processing request to the interrupt processing CPU so that the interrupt processing CPU processes the data packet received by the network card.
The invention also provides a programmable interrupt controller, in which the corresponding relation between the interrupt processing CPU and the network card is preset, the programmable terminal controller comprises:
the system comprises a receiving module, a processing module and a processing module, wherein the receiving module is used for receiving an interrupt processing request from any network card, and the interrupt processing request is used for requesting to process any data packet received by the network card;
the query module is used for querying the interrupt processing CPU corresponding to the network card in the corresponding relation between the interrupt processing CPU and the network card;
and the forwarding module is used for forwarding the interrupt processing request to the interrupt processing CPU so that the interrupt processing CPU processes the data packet received by the network card.
The invention also provides an interrupt processing method, which comprises the following steps:
the method comprises the steps that a programmable interrupt controller receives an interrupt processing request from any network card, wherein the interrupt processing request is used for requesting to process any data packet received by the network card; inquiring an interrupt processing CPU corresponding to the network card in a preset corresponding relation between the interrupt processing CPU and the network card, and forwarding the interrupt processing request to the interrupt processing CPU;
the interrupt processing CPU acquires the data packet from the network card when receiving an interrupt processing request from the programmable interrupt controller; determining a service processing CPU to process the data packet from the service processing CPU, and sending the data packet to the service processing CPU;
and the service processing CPU processes the data packet.
Preferably, when receiving an interrupt processing request from the programmable interrupt controller, the interrupt processing CPU acquires the data packet from the network card, including:
and when the interrupt processing CPU receives an interrupt processing request from the programmable interrupt controller, calling the NAPI instance corresponding to the network card and acquiring the data packet from the network card.
Preferably, the method further comprises:
and the service processing CPU runs an upper application program corresponding to the data packet.
Preferably, the interrupt handling method is applied to a firewall device.
The present invention also provides an interrupt processing system comprising the programmable interrupt controller, the interrupt processing CPU and the service processing CPU of the above claim 2;
the interrupt processing CPU comprises a packet fetching module and a computing module;
the packet fetching module is used for acquiring a data packet from a network card sending an interrupt processing request when the interrupt processing request from the programmable interrupt controller is received;
the computing module is used for determining a service processing CPU from the service processing CPUs to process the data packet and sending the data packet to the service processing CPU;
and the service processing CPU is used for processing the data packet.
Preferably, the packet fetching module is specifically configured to, when receiving an interrupt processing request from the programmable interrupt controller, invoke a NAPI instance corresponding to a network card that sends the interrupt processing request, and obtain the data packet from the network card.
Preferably, the service processing CPU is further configured to run an upper layer application program corresponding to the data packet.
Preferably, the interrupt handling system is applied to a firewall device.
The invention provides an interrupt processing method, an interrupt processing system and a programmable interrupt controller, wherein the interrupt processing method is applied to the programmable interrupt controller, the programmable interrupt controller is preset with a corresponding relation between an interrupt processing CPU and a network card, and the method comprises the following steps: receiving an interrupt processing request from any network card, wherein the interrupt processing request is used for requesting to process any data packet received by the network card; and inquiring an interrupt processing CPU corresponding to the network card in the corresponding relation between the interrupt processing CPU and the network card, and forwarding the interrupt processing request to the interrupt processing CPU so that the interrupt processing CPU processes the data packet received by the network card. The interrupt processing CPU and the network card have a corresponding relation, each interrupt processing CPU is only used for processing the interrupt processing request of the network card having the corresponding relation, when the interrupt processing request from the network card is received, the NAPI example currently operated by the interrupt processing CPU is probably just the NAPI example corresponding to the network card, NAPI example switching is not needed at the moment, and the processing resource of the interrupt processing CPU is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a flowchart of an interrupt processing method according to an embodiment of the present invention;
FIG. 2 is a flowchart of another interrupt processing method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a programmable interrupt controller according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an interrupt processing system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The following description will be made of specific contents of examples.
An embodiment of the present invention provides an interrupt processing method, and referring to fig. 1, is a flowchart of an interrupt processing method provided in an embodiment of the present invention, where the interrupt processing method is applied to a programmable interrupt controller, and a corresponding relationship between an interrupt processing CPU and a network card is preset in the programmable interrupt controller, and the method specifically includes:
s101: receiving an interrupt processing request from any network card, wherein the interrupt processing request is used for requesting to process any data packet received by the network card.
S102: and inquiring an interrupt processing CPU corresponding to the network card in the corresponding relation between the interrupt processing CPU and the network card, and forwarding the interrupt processing request to the interrupt processing CPU for processing.
In the embodiment of the invention, the programmable interrupt controller is preset with the corresponding relation between the interrupt processing CPU and the network card, wherein the interrupt processing CPU is only used for processing the interrupt processing request from the network card corresponding to the interrupt processing CPU.
It is worth pointing out that each interrupt processing CPU only needs to be configured with the NAPI instance of the network card having a corresponding relationship with the interrupt processing CPU, when processing the interrupt processing request from the network card, the currently running NAPI instance of the interrupt processing CPU may be exactly the NAPI instance corresponding to the network card, at this time, switching of the NAPI instance is not needed, and the processing resource of the interrupt processing CPU is saved.
In practical application, after receiving an interrupt processing request from any network card, the programmable interrupt controller queries an interrupt processing CPU corresponding to the network card in a preset corresponding relationship between the interrupt processing CPU and the network card, and forwards the interrupt processing request to the interrupt processing CPU for processing.
In practical applications, the interrupt processing request received by the programmable interrupt controller may be from the network card or from other hardware devices. Therefore, the programmable interrupt controller of the embodiment of the present invention needs to be able to recognize the interrupt processing request from the network card in order to process it.
In one implementation, the interrupt handling request may carry an interrupt number, and the interrupt numbers corresponding to the network card and other hardware devices are fixed under the condition that the hardware circuit and the bios firmware are not changed. After receiving the interrupt processing request, the programmable interrupt controller determines whether the interrupt processing request is from the network card or not through an interrupt number carried by the interrupt processing request.
An embodiment of the present invention further provides an interrupt processing method, and referring to fig. 2, a flowchart of the interrupt processing method provided in the embodiment of the present invention is provided. The method specifically comprises the following steps:
s201: the method comprises the steps that a programmable interrupt controller receives an interrupt processing request from any network card, wherein the interrupt processing request is used for requesting to process any data packet received by the network card; and inquiring an interrupt processing CPU corresponding to the network card in a preset corresponding relation between the interrupt processing CPU and the network card, and forwarding the interrupt processing request to the interrupt processing CPU.
S202: the interrupt processing CPU acquires the data packet from the network card when receiving an interrupt processing request from the programmable interrupt controller; and determining a service processing CPU to process the data packet from the service processing CPU, and sending the data packet to the service processing CPU.
S203: and the service processing CPU processes the data packet.
In the interrupt processing method provided by the embodiment of the present invention, since the interrupt processing request of the network card is processed while being burdened and the data packet from the network card is processed, the burden of the CPU is too heavy and the packet loss problem of the data packet may occur. Therefore, the embodiment of the present invention previously distinguishes the CPU that processes the interrupt processing request from the CPU that processes the service packet. That is to say, the interrupt processing CPU in the embodiment of the present invention is configured to process an interrupt processing request from the network card, and the service processing CPU is configured to process a data packet from the network card.
In practical application, after the programmable interrupt controller determines that the received interrupt processing request comes from the network card, the interrupt processing CPU corresponding to the network card is inquired and forwarded to the interrupt processing CPU. And the interrupt processing CPU calls the NAPI example corresponding to the network card, runs the poll function of the NAPI example and acquires the data packet from the network card.
Since the service processing CPU is responsible for processing the data packet from the network card, the interrupt processing CPU in the embodiment of the present invention is further configured to select one of the service processing CPUs as a target service processing CPU for the data packet. The selection algorithm used may be an adjusted RPS/RFS method, specifically, a selectable CPU range in the RPS/RFS method is modified into a service processing CPU for processing a data packet from a network card in the embodiment of the present invention. Specifically, the interrupt processing CPU that receives the data packet may determine, according to the RPS/RFS method, one service processing CPU among service processing CPUs that process the data packet from the network card, to be used for processing the data packet. And after determining a service processing CPU for processing the data packet, the interrupt processing CPU forwards the data packet to the service processing CPU. The interrupt processing method provided by the embodiment of the invention can be applied to firewall equipment.
In practical applications, the upper layer application program and the corresponding data packet are not processed on the same CPU, which may cause frequent switching between different CPUs in the process of processing the data packet. In order to avoid the above problem, in the embodiment of the present invention, an upper layer application corresponding to the data packet is run on a service processing CPU for processing the data packet.
An embodiment of the present invention further provides a programmable interrupt controller, and referring to fig. 3, a schematic structural diagram of the programmable interrupt controller provided in the embodiment of the present invention is shown. The programmable interrupt controller 100 is connected to the network card 200 and the interrupt processing CPU300, the programmable interrupt controller 100 is preset with a corresponding relationship between the interrupt processing CPU and the network card, and the programmable terminal controller 100 includes:
the receiving module 110 is configured to receive an interrupt processing request from any network card, where the interrupt processing request is used to request processing of any data packet received by the network card.
The query module 120 is configured to query the interrupt processing CPU corresponding to the network card in the correspondence between the interrupt processing CPUs and the network card.
A forwarding module 130, configured to forward the interrupt processing request to the interrupt processing CPU, so that the interrupt processing CPU processes the data packet received by the network card.
The programmable interrupt controller in the embodiment of the invention stores the corresponding relation between the interrupt processing CPU and the network card in advance, and the interrupt processing CPU is only used for processing the interrupt processing request sent by the network card corresponding to the interrupt processing CPU. The programmable interrupt controller provided by the embodiment of the invention can reduce the waste of processing resources when the interrupt processing CPU processes the network card interrupt.
In addition, an interrupt processing system is further provided in an embodiment of the present invention, and referring to fig. 4, a schematic structural diagram of the interrupt processing system provided in the embodiment of the present invention is shown, where the interrupt processing system includes the above programmable interrupt controller 100, an interrupt processing CPU300, and a service processing CPU 400;
the interrupt processing CPU300 includes a packet fetching module and a calculation module;
the packet fetching module is configured to, when receiving an interrupt processing request from the programmable interrupt controller 100, obtain a data packet from a network card that sends the interrupt processing request;
the computing module is used for determining a service processing CPU from the service processing CPUs to process the data packet and sending the data packet to the service processing CPU;
the service processing CPU400 is configured to process the data packet.
As shown in fig. 4, after receiving a data packet, the network card 4 generates an interrupt processing request and sends the interrupt processing request to the programmable interrupt controller 100, and after receiving the interrupt processing request, the programmable interrupt controller 100 queries an interrupt processing CPU2 corresponding to the network card that sends the interrupt processing request, and the interrupt processing CPU2 obtains the data packet from the network card 4. After the interrupt processing CPU2 obtains the data packet, it calculates a service processing CPU for processing the data packet, determines a service processing CPU2, and sends the data packet to the service processing CPU2, which is responsible for processing the data packet.
In the interrupt processing system provided by the embodiment of the invention, the CPU for processing the network card interrupt is separated from the CPU for processing the service data packet, so that the problem of data packet loss when the same CPU is used for interrupt processing and service processing is avoided.
In practical application, the packet fetching module according to the embodiment of the present invention is specifically configured to, when receiving an interrupt processing request from the programmable interrupt controller, invoke an NAPI instance corresponding to a network card that sends the interrupt processing request, and obtain the data packet from the network card.
The service processing CPU400 is further configured to run an upper layer application program corresponding to the data packet.
The interrupt processing system in the embodiment of the invention can be applied to firewall equipment.
For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The present invention provides an interrupt processing method, system and programmable interrupt controller, which are described in detail above, and the principle and implementation of the present invention are explained in this document by applying specific examples, and the description of the above embodiments is only used to help understanding the method and core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. An interrupt processing method is applied to a programmable interrupt controller, wherein a corresponding relation between interrupt processing CPUs and a network card is preset in the programmable interrupt controller, each interrupt processing CPU is configured with a NAPI instance of the network card having the corresponding relation with the interrupt processing CPU, and each interrupt processing CPU is only used for processing an interrupt processing request from the network card having the corresponding relation with the interrupt processing CPU, and the method comprises the following steps:
receiving an interrupt processing request from any network card, wherein the interrupt processing request is used for requesting to process any data packet received by the network card;
and inquiring an interrupt processing CPU corresponding to the network card in the corresponding relation between the interrupt processing CPU and the network card, and forwarding the interrupt processing request to the interrupt processing CPU corresponding to the network card so that the interrupt processing CPU corresponding to the network card processes the data packet received by the network card.
2. A programmable interrupt controller is characterized in that the programmable interrupt controller is preset with a corresponding relation between interrupt processing CPUs and a network card, each interrupt processing CPU is configured with a NAPI example of the network card corresponding to the interrupt processing CPU, and each interrupt processing CPU is only used for processing an interrupt processing request from the network card corresponding to the interrupt processing CPU, and the programmable interrupt controller comprises:
the system comprises a receiving module, a processing module and a processing module, wherein the receiving module is used for receiving an interrupt processing request from any network card, and the interrupt processing request is used for requesting to process any data packet received by the network card;
the query module is used for querying the interrupt processing CPU corresponding to the network card in the corresponding relation between the interrupt processing CPU and the network card;
and the forwarding module is used for forwarding the interrupt processing request to an interrupt processing CPU corresponding to the network card so that the interrupt processing CPU corresponding to the network card can process the data packet received by the network card.
3. An interrupt handling method, the method comprising:
the method comprises the steps that a programmable interrupt controller receives an interrupt processing request from any network card, wherein the interrupt processing request is used for requesting to process any data packet received by the network card; inquiring an interrupt processing CPU corresponding to the network card in a preset corresponding relation between the interrupt processing CPUs and the network card, and forwarding the interrupt processing request to the interrupt processing CPUs corresponding to the network card, wherein each interrupt processing CPU is provided with an NAPI example of the network card corresponding to the interrupt processing CPU, and each interrupt processing CPU is only used for processing the interrupt processing request from the network card corresponding to the interrupt processing CPU;
the interrupt processing CPU acquires the data packet from the network card when receiving an interrupt processing request from the programmable interrupt controller; determining a service processing CPU to process the data packet from the service processing CPU, and sending the data packet to the service processing CPU;
and the service processing CPU processes the data packet.
4. The interrupt processing method according to claim 3, wherein the acquiring, by the interrupt processing CPU, the data packet from the network card upon receiving an interrupt processing request from the programmable interrupt controller includes:
and when the interrupt processing CPU receives an interrupt processing request from the programmable interrupt controller, calling the NAPI instance corresponding to the network card and acquiring the data packet from the network card.
5. The interrupt processing method of claim 3, further comprising:
and the service processing CPU runs an upper application program corresponding to the data packet.
6. The interrupt handling method according to any one of claims 3 to 5, wherein the interrupt handling method is applied to a firewall device.
7. An interrupt processing system, comprising the programmable interrupt controller of claim 2, an interrupt processing CPU, and a traffic processing CPU;
the interrupt processing CPU comprises a packet fetching module and a computing module;
the packet fetching module is used for acquiring a data packet from a network card sending an interrupt processing request when the interrupt processing request from the programmable interrupt controller is received;
the computing module is used for determining a service processing CPU from the service processing CPUs to process the data packet and sending the data packet to the service processing CPU;
and the service processing CPU is used for processing the data packet.
8. The interrupt processing system of claim 7, wherein the packet fetching module is specifically configured to, when receiving an interrupt processing request from the programmable interrupt controller, invoke a NAPI instance corresponding to a network card that sends the interrupt processing request, and obtain the data packet from the network card.
9. The interrupt processing system of claim 7, wherein the business processing CPU is further configured to run an upper layer application corresponding to the data packet.
10. An interrupt handling system according to any of claims 7 to 9, wherein the interrupt handling system is applied to a firewall device.
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