JP2019176366A - Information processing device, information processing method, and program - Google Patents

Abstract

To provide an information processing device capable of preventing wasteful use of resources or untimely data transmission at the time of link down.SOLUTION: An information processing device includes: a plurality of network interface cards; a plurality of transmission processing units for preparing transmission data to be transmitted by the network interface cards; and a control unit for stopping the transmission processing units preparing transmission data to be transmitted by a network interface card whose link down is detected when the link down is detected in any of the network interface cards.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an information processing apparatus, an information processing method, and a program.

For example, Patent Document 1 has a plurality of communication ports 11 and a plurality of communication interfaces 12, and when the communication abnormality detection unit 14 detects a communication abnormality, the connection switching unit 13 is controlled to detect the communication abnormality. A network device that is connected to a communication port 11 to which a network communication device is connected and changes the communication interface 12 is disclosed.
In Patent Document 2, a link state change is detected at an associated output port, and one or more link state changes at the output port are detected via the output port. A networking device capable of notifying the input port is disclosed.
In Patent Document 3, the transmission side transmits data with a time stamp added to video data, and the reception side adds a time longer than the time required for wireless communication to the time stamp added to the reception data, The time stamp check unit 0819 for comparing the added time stamps has a function of discarding data regardless of the time stamp value, and the time stamp check unit 0819 is set for a set time from the time when the start of data transmission is detected. A video transmission system in which a data discard control unit 0826 for instructing data discard is newly provided is disclosed.
In Patent Document 4, a packet reception driver waits for reception of a packet by a network interface by a loop process, and information indicating the alive state of at least one of the network interface 105 and the packet reception driver between the loop processes A monitoring method is disclosed in which the monitoring unit 114 of the monitoring device monitors the alive state of at least one of the network interface and the packet reception driver with reference to the alive information storage unit. ing.

JP 2017-184087 Special table 2018-504825 JP 2006-203649 A JP 2017-151765

  It is an object of the present invention to provide an information processing apparatus capable of suppressing wasteful use of resources at the time of link down or data transmission that is missed.

  The information processing apparatus according to the present invention includes a plurality of network interface cards, a plurality of transmission processing units that prepare transmission data to be transmitted by the network interface card, and a link down detected in any of the network interface cards. And a control unit that causes the transmission processing unit to stop preparing transmission data to be transmitted by the network interface card in which link down is detected.

  Preferably, the transmission processing unit accumulates transmission data in a transmission queue by loop processing, and the control unit replaces the transmission processing unit with a part of the loop processing by transmission processing that causes transmission failure. To stop preparation of transmission data.

  Preferably, the plurality of transmission processing units prepare transmission data using a shared computer resource, and the transmission processing unit allocated to the network interface card that is linked down is a shared computer. Do not request new allocation of resources.

  Preferably, the plurality of transmission processing units constitute a transmission queue for storing transmission data using a shared recording area, and the transmission processing units allocated to a network interface card that is linked down Does not require a new allocation of a shared recording area for the transmission queue.

  Preferably, there is further provided a flash processing unit for flushing the accumulated transmission data only to the network interface card in which the link down is detected.

  Preferably, when the link down is detected, the flash processing unit instructs the network interface card in which the link down is detected to stop communication, and then instructs the communication start.

  Preferably, the transmission processing unit is a part of a driver of the network interface card, accumulates transmission data in a transmission queue by loop processing without monitoring a link state of the network interface card, and the control unit Causes the transmission processing unit to replace the contents of the loop processing based on the link down detected by the network interface card.

  In the information processing method according to the present invention, for each of a plurality of network interface cards, a transmission preparation step of preparing transmission data to be transmitted by each of the network interface cards, and a link down is detected in any of the network interface cards A stop step of stopping preparation of transmission data to be transmitted by the network interface card in which link down is detected.

  The program according to the present invention relates to a plurality of network interface cards, a transmission preparation step of preparing transmission data to be transmitted by each of the network interface cards, and when link down is detected in any of the network interface cards. And causing the computer to execute a stop step of stopping preparation of transmission data to be transmitted by the network interface card in which link down is detected.

  It is possible to suppress waste of resources at the time of link down or data transmission that is missed.

1 is a diagram illustrating a hardware configuration of a network communication system 1 including a network device 10. FIG. 2 is a diagram illustrating a hardware configuration of a network device 10. FIG. 2 is a diagram illustrating a functional block of a network device 10. FIG. (A) is a diagram for explaining the LAN driver 360 (FIG. 3) in the control plane core in more detail, and (B) is a diagram for explaining the LAN driver 460 (FIG. 3) in the data plane core in more detail. is there. It is a figure which illustrates the system configuration centering on the relationship between a control plane core and a data plane core, and the interface of a LAN card. It is a figure which illustrates a loop process typically. It is a flow chart explaining processing (S10) of network device 10 at the time of link down. It is a flow chart explaining processing (S20) of network device 10 at the time of link up.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a hardware configuration of a network communication system 1 including a network device 10.
As illustrated in FIG. 1, the network communication system 1 includes a plurality of network devices 10 and a network switch 20 that connects them.
The network device 10 is a network device used by connecting to a network. The network device 10 is an example of an information processing device according to the present invention. The network device of this example is connected to the LAN via the LAN cable and the network switch 20 and has a bandwidth control function, a firewall function, etc., and is redundant with other network devices 10 to provide fault tolerance through a redundant configuration. It is increasing. Specifically, when the survival monitoring packet is transmitted and received between the operating network device 10A (Active) and the waiting network device 10B (Standby) and the predetermined time survival monitoring packet is not transmitted and received, The network device 10B becomes operational and takes over the role.
In such a configuration, survival monitoring packets (heartbeat packets), LLC (Logical Link Control) packets, and the like are transmitted and received between the network devices 10 regardless of the link up / down of the LAN port.

FIG. 2 is a diagram illustrating a hardware configuration of the network device 10.
As illustrated in FIG. 2, the network device 10 includes a CPU 100, a memory 102, a plurality of slots 104, a south bridge 106, a hard disk drive 108, a compact flash (registered trademark) conversion adapter 110, a DVD drive 112, and a LAN card 120. Have
The CPU 100 is a central processing unit. The CPU 100 in this example is a multi-core processor including a plurality of cores.
The memory 102 is, for example, a semiconductor memory, is connected to the CPU 100, and functions as a main storage device.
The slot 104 is an expansion slot, and for example, a LAN card 120 or the like is inserted therein. A LAN card 120 is inserted into the slot 104 of this example, and the LAN card 120 of this example is provided with a plurality of interfaces (# 0 to # 3) via PCI switches.
The south bridge 106 is an IC chip that connects, for example, a SATA bus. In this example, a hard disk drive 108, a compact flash (registered trademark) conversion adapter 110, and a DVD drive 112 are connected to the south bridge 106.

  The LAN card 120 is an expansion device for connecting a device such as a computer to a communication network. The LAN card 120 in this example is a card type expansion device for connecting to Ethernet (registered trademark), and includes a LAN controller that monitors the link state and a FIFO (First In, First Out) that accumulates transmission / reception data. To do. The LAN card 120 is an example of a network interface card according to the present invention, but is not limited thereto, and may be hardware that serves as an interface for a communication network.

The network apparatus 10 of this example employs a data plane development kit (Data Plane Development Kit) in the hardware configuration described above, thereby realizing high-speed packet processing. Specifically, when packet transmission is requested from the upper application software to the data plane development kit (the control plane core processing unit 300 and the data plane core processing unit 400 in FIG. 3), the data plane development kit (hereinafter referred to as DPDK) Transmission data is set in the transmission queue. The DPDK notifies the LAN controller of the LAN card 120 that there is transmission data. The LAN controller of the LAN card 120 acquires transmission data from the transmission queue of the DPDK to the FIFO in the LAN card 120 by DMA. The LAN card 120 sends the transmission data stored in the FIFO to the transmission path.
At this time, the DPDK transmission process (data plane core processing unit 400) links the arrived transmission data to the transmission queue without being aware of the link up / link down state of the port. In other words, the DPDK transmission process (data plane core processing unit 400) is configured to continue preparing transmission data in the transmission queue even if a link down occurs.

FIG. 3 is a diagram illustrating functional blocks of the network device 10.
As illustrated in FIG. 3, the network device 10 includes a control plane core processing unit 300 and a data plane core processing unit 400 as functional blocks of the LAN driver.
The control plane core processing unit 300 performs control processing for the LAN card 120 and the like. The control plane core processing unit 300 of this example includes an upper engine processing unit 320, a LAN driver common unit 340, and a LAN driver 360. The upper engine processing unit 320 outputs data necessary for control to the LAN card 120 via the LAN driver common unit 340 and the LAN driver 360 in accordance with an instruction from the upper layer.

  The data plane core processing unit 400 performs packet processing. The data plane core processing unit 400 of this example includes an upper engine processing unit 420, a LAN driver common unit 440, and a LAN driver 460. The upper engine processing unit 420 executes processing such as a firewall. The LAN driver common unit 440 performs a process common to the LAN card on packets to be transmitted and received in response to an instruction from the upper engine processing unit 420. The LAN driver 460 directly accesses the LAN card 120 and transmits / receives a packet instructed from the LAN driver common unit 440. That is, the received packet is received from the LAN card 120 by the LAN driver 440, passes through the LAN driver common unit 440, and a unique function such as a firewall function is applied by the upper engine processing unit 420. The transmission packet passes from the upper engine processing unit 420 through the LAN driver common unit 440 and is transferred from the LAN driver 460 to the LAN card 120. The data plane core processing unit 400 is an example of a control unit according to the present invention.

4A is a diagram for explaining the LAN driver 360 (FIG. 3) in the control plane core in more detail, and FIG. 4B is a diagram showing the LAN driver 460 (FIG. 3) in the data plane core in more detail. It is a figure explaining.
As illustrated in FIG. 4A, the LAN driver 360 of the control plane core includes a link down detection unit 362, a transmission processing replacement unit 364, and a flash processing unit 366.
The link down detection unit 362 detects link down of the LAN card 120. The link down detection unit 362 of this example detects link down or link up of the LAN card 120 based on the notification from the LAN controller of the assigned LAN card 120.

  The transmission processing replacement unit 364 replaces part of the loop processing in the LAN driver 460 of the data plane core with transmission processing that results in transmission failure, and stops preparation of transmission data. The transmission process replacement unit 364 of this example performs a transmission process of transmitting a packet to the LAN driver 460 of the data plane core when a link down is detected by the link down detection unit 362, and sets the processing result as a transmission failure. It is replaced with the pseudo transmission process (transmission drop process) to be output, and the preparation of the transmission packet is stopped. Also, the transmission processing replacement unit 364 transmits a packet to the data plane core LAN driver 460 in a pseudo transmission process (transmission drop process) when the link down detection unit 362 detects a link up. By replacing the transmission processing, the preparation of the transmission packet is resumed. The transmission process replacement unit 364 of this example replaces the transmission process and the transmission drop process with each other by changing the transmission function.

The flash processing unit 366 flushes the transmission data stored in the FIFO only to the LAN card 120 in which the link down is detected by the link down detection unit 362. For example, when the link down detection unit 362 detects a link down, the flash processing unit 366 instructs the LAN card 120 in which the link down is detected to stop communication, and then instructs the communication start. Then, the transmission data in the FIFO is erased. By instructing the start of communication, a link-up interrupt can be received.
The flash processing unit 366 may further cause the LAN driver 460 of the data plane core processing unit 400 to release the transmission queue.

As illustrated in FIG. 4B, the data plane core LAN driver 460 includes a transmission processing unit 462 and a transmission drop processing unit 464.
The transmission processing unit 462 prepares transmission data to be transmitted by the LAN card 120 as part of the loop processing. More specifically, the transmission processing unit 462 accumulates transmission data in the transmission queue and transfers the accumulated transmission data to the LAN card 120 for transmission. That is, the transmission processing unit 462 performs packet transmission processing conforming to the data plane development kit as part of the driver of the LAN card 120.
Here, the loop process is a process in which a plurality of types of fixed processes are repeatedly executed in sequence. That is, the loop process is a process in which the same kind of process is repeated in a cycle. For example, the loop process may include an atypical process in addition to the standard process.

  The transmission drop processing unit 464 executes transmission processing that results in transmission failure. That is, the transmission drop processing unit 464 executes a pseudo transmission process for outputting a message indicating that transmission has failed as an alternative process of the transmission process performed by the transmission processing unit 462.

  In addition to the above processes, the LAN driver 460 executes a packet reception process in accordance with the data plane development kit as part of the loop process.

FIG. 5 is a diagram illustrating a system configuration centering on the relationship between the control plane core and data plane core and the interface of the LAN card.
As illustrated in FIG. 5, one of the plurality of cores (# 0 to #N) of the CPU 100 is assigned as a control plane core, and the remaining N cores are assigned as data plane cores. Each data plane core executes packet transmission / reception processing by loop processing.
That is, in each data plane core, a transmission queue and a reception queue are prepared for each interface of the LAN card 120, and high-speed packet processing is realized by executing transmission / reception processing in an infinite loop. In this high-speed packet processing, transmission processing and reception processing are executed in a loop. If a process for checking the link state is inserted into the loop process, the overall processing speed is reduced.
Therefore, the LAN driver 460 of each data plane core, as shown in FIG. 6, performs transmission processing by the transmission processing unit 462 or transmission as part of the loop processing in accordance with the control of the LAN driver 360 of the control plane core. The drop processing unit 464 is selectively executed to suppress a decrease in loop processing speed.

The plurality of data plane core processing units 400 constitute a transmission queue for storing transmission data using a shared recording area. If the link-down state continues, the FIFO of the LAN card 120 is full and the transmission data accumulated in the transmission queue of the data plane core processing unit 400 cannot be transferred to the FIFO. The queue data cannot be released, and the queue is in a staying state. As a result, the shared recording area is depleted and transmission / reception efficiency is reduced.
Therefore, the LAN driver 460 of the data plane core assigned to the LAN card 120 that has been linked down replaces the transmission process with the transmission drop process so as not to newly assign a computer resource for the transmission queue.

FIG. 7 is a flowchart for explaining the processing (S10) of the network device 10 when the link is down.
As illustrated in FIG. 7, in step 100 (S100), the LAN controller of any of the LAN cards 120 waits until detecting a link down (S100: No), and when detecting a link down (S100: Yes). , The process proceeds to S105.

  In step 105 (S105), the LAN controller of the LAN card 120 that has detected the link down notifies the product firmware of a link change interrupt and notifies the link down.

In step 110 (S110), a thread is activated in the DPDK of the control plane core processing unit 300.
In step 115 (S115), the link down detection unit 362 of the LAN driver 360 of the control plane core processing unit 300 detects link down based on the interrupt notification from the LAN card 120.

In step 120 (S120), when the link-down detecting unit 362 detects a link-down, the transmission processing replacing unit 364 sends the data-plane core processing unit 400 LAN driver 460 assigned to the linked-down LAN card 120 to the LAN driver 460. To instruct the transmission process to be replaced with the transmission drop process.
The LAN driver 460 of the data plane core processing unit 400 replaces the transmission processing by the transmission processing unit 462 with the transmission drop processing by the transmission drop processing unit 464 in response to an instruction from the transmission processing replacement unit 364.

In step 125 (S125), the flash processing unit 366 instructs the LAN card 120 that has been linked down to stop communication, and then instructs the communication to start.
In response to an instruction from the flash processing unit 366, the LAN card 120 stops communication, starts communication, and flushes the transmission packet in the FIFO.

  In this way, when the network device 10 is linked down with any of the LAN cards 120, the LAN driver 460 of the data plane core assigned to the LAN card 120 replaces the transmission process with the transmission drop process, Stop preparing the transmission data. Furthermore, the network device 10 causes the LAN card 120 that has been linked down to execute a flush process so that the transmission packet that has accumulated in the FIFO is not sent out after the link up.

FIG. 8 is a flowchart for explaining the processing (S20) of the network device 10 at the time of link-up.
As illustrated in FIG. 8, in step 200 (S200), the LAN controller of any LAN card 120 waits until it detects link-up (S200: No), and detects link-up (S200: Yes). , The process proceeds to S205.

  In step 205 (S205), the LAN controller of the LAN card 120 that has detected the link up notifies the product firmware of a link change interrupt and notifies the link up.

In step 210 (S210), a thread is activated in the DPDK of the control plane core processing unit 300.
In step 215 (S215), the link down detection unit 362 of the LAN driver 360 of the control plane core processing unit 300 detects link up based on the interrupt notification from the LAN card 120.

In step 220 (S220), when the link-down detecting unit 362 detects a link up, the transmission processing replacing unit 364 sends the LAN driver 460 of the data plane core processing unit 400 assigned to the LAN card 120 linked up. The transmission drop process is instructed to be replaced with the transmission process.
The LAN driver 460 of the data plane core processing unit 400 replaces the transmission drop processing by the transmission drop processing unit 464 with the transmission processing by the transmission processing unit 462 in response to an instruction from the transmission processing replacement unit 364.

  In this way, when link up is detected for any of the LAN cards 120, the network device 10 returns from the transmission drop processing to the transmission processing and resumes packet transmission.

As described above, the network device 10 according to the present embodiment replaces the transmission process of the corresponding LAN driver 460 with the transmission drop process when a link down occurs in any of the LAN cards 120, so that this LAN The preparation of the packet to be transmitted by the card 120 is stopped, and the waste of computer resources required for the preparation of the packet is suppressed.
In addition, when the link down occurs, the network device 10 flushes the FIFO of the corresponding LAN card 120 to suppress timely data transmission.

DESCRIPTION OF SYMBOLS 1 ... Network communication system 10 ... Network apparatus 100 ... CPU
DESCRIPTION OF SYMBOLS 102 ... Memory 104 ... Slot 120 ... LAN card 300 ... Control plane core process part 360 ... LAN driver 362 ... Link down detection part 364 ... Transmission process replacement part 366 ... Flash process part 400 ... Data plane core process part 460 ... LAN driver 462 ... Transmission processing unit 464 ... Transmission drop processing unit

Claims (9)

Multiple network interface cards;
A plurality of transmission processing units for preparing transmission data to be transmitted by the network interface card;
An information processing apparatus comprising: a control unit that causes the transmission processing unit to stop preparing transmission data to be transmitted by the network interface card in which link down is detected when link down is detected in any of the network interface cards . The transmission processing unit accumulates transmission data in a transmission queue by loop processing,
The information processing apparatus according to claim 1, wherein the control unit causes the transmission processing unit to replace a part of the loop processing with a transmission process that results in a transmission failure and stop preparation of transmission data. The plurality of transmission processing units prepare transmission data using shared computer resources,
The information processing apparatus according to claim 1, wherein the transmission processing unit allocated to a network interface card that is linked down does not request a new allocation of a shared computer resource. The plurality of transmission processing units configure a transmission queue for storing transmission data using a shared recording area,
The information processing apparatus according to claim 3, wherein the transmission processing unit allocated to a network interface card that is linked down does not request a new allocation of a shared recording area for a transmission queue. The information processing apparatus according to claim 2, further comprising: a flash processing unit that flushes stored transmission data only to a network interface card in which link down is detected. The information processing according to claim 5, wherein when the link-down is detected, the flash processing unit instructs the network interface card in which the link-down is detected to stop communication, and then instructs the communication start. apparatus. The transmission processing unit is a part of the driver of the network interface card, accumulates transmission data in a transmission queue in a loop process without monitoring the link state of the network interface card,
The information processing apparatus according to claim 1, wherein the control unit causes the transmission processing unit to replace the content of loop processing based on a link down detected by the network interface card. For each of a plurality of network interface cards, a transmission preparation step of preparing transmission data to be transmitted by each of the network interface cards;
An information processing method comprising: a stop step of stopping preparation of transmission data to be transmitted by the network interface card in which link down is detected when link down is detected in any of the network interface cards. For each of a plurality of network interface cards, a transmission preparation step of preparing transmission data to be transmitted by each of the network interface cards;
A program for causing a computer to execute a stop step of stopping preparation of transmission data to be transmitted by a network interface card in which link down is detected when link down is detected in any of the network interface cards.

Images