CN109688066B - Gateway filtering driving method based on GigE Vision - Google Patents

Gateway filtering driving method based on GigE Vision Download PDF

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CN109688066B
CN109688066B CN201811643230.4A CN201811643230A CN109688066B CN 109688066 B CN109688066 B CN 109688066B CN 201811643230 A CN201811643230 A CN 201811643230A CN 109688066 B CN109688066 B CN 109688066B
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data frame
network
network port
data
retransmission window
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CN109688066A (en
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邵云峰
曹桂平
董宁
李博川
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Hefei Eko Photoelectric Technology Co.,Ltd.
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Hefei Itek Photoelectrics Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/12—Avoiding congestion; Recovering from congestion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/188—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention discloses a network port filtering driving method based on GigE Vision, which comprises the following steps: installing a network filter driver, and registering a filter criterion of a data frame in a Windows kernel through the network filter driver, wherein the filter criterion comprises a source address of the data frame, a destination address of the data frame, a transmission type of the data frame and a port model of the data frame, the network filter driver judges whether each data frame reaching a network port meets the filter criterion, if so, the data frame is directly stored in a pre-registered image buffer area, and if not, the data frame is forwarded to an upper layer driver; before the data frame is directly stored in the pre-registered image buffer area, each data frame arriving at the network port is sequentially detected, the CPU load of the method is low, and the phenomena of data frame loss and frame disordering are effectively solved.

Description

Gateway filtering driving method based on GigE Vision
Technical Field
The invention relates to the technical field of network transmission, in particular to a network port filtering driving method based on GigE Vision.
Background
At present, the communication modes of the industrial camera mainly include a 1394 interface, a USB interface, an amerarink interface and a gigabit network interface. The transmission distances of the 1394 interface, the USB interface and the amerarink interface are limited, and the gigabit network interface is used for communication, so that the gigabit network interface is widely applied due to the characteristics of long transmission distance, high transmission speed, large quantity of networking equipment, no need of a data acquisition card and the like. Mainstream industrial camera manufacturers, abroad such as Balser, japan JAI, uk E2V, Dalsa, korea, Vieworks, and domestic such as great chant, jiahenzhong self, micro vision images, etc., all have industrial camera products for multi-gigabit network communication.
The industrial camera can be connected to a gigabit network system, a network communication protocol must be operated, the traditional protocols at a transmission layer comprise a TCP protocol and a UDP protocol, but the TCP protocol has the defects of large occupied CPU resource, slow transmission speed and easy attack in the network transmission process, and the UDP protocol has the defect of being incapable of providing reliability, flow control or error recovery function for IP in the network transmission process. Because the GigE Vision protocol has the characteristics of long transmission distance and high transmission speed, the GigE Vision protocol developed based on the existing gigabit Ethernet communication protocol is applied. Although the GigE Vision protocol can provide reliability, flow control or error recovery functions, Socket communication of Windows itself polls the current network frame transmitted by the GigE Vision, so that the CPU occupancy rate can be significantly improved when data transmission is increased, so that the GigE Vision occupies relatively higher resources of the CPU, and in case of network condition fluctuation or network congestion, for the case that data frame loss and disorder may occur, there is no corresponding retransmission mechanism to process the data frame, so that the received data frame has frame loss and frame disorder.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a gateway filtering driving method based on GigE Vision, which has lower CPU load and effectively solves the phenomena of data frame loss and frame disturbance.
The invention provides a network port filtering driving method based on GigE Vision, which comprises the following steps:
installing a network filter driver, and registering a filter criterion of a data frame in a Windows kernel through the network filter driver;
the network filtering driver judges whether each data frame reaching the network port meets the filtering criterion;
if yes, directly storing the data frame into a pre-registered image buffer area;
if not, the data frame is forwarded to an upper layer driver.
Further, the filtering criteria include a source address of the data frame, a destination address of the data frame, a transmission type of the data frame, and a port model of the data frame.
Further, before the data frame is directly stored in the pre-registered image buffer area, each data frame arriving at the network port is sequentially detected, and the sequential detection comprises the following steps:
if the data frames arrive at the network port in sequence, the data frames arriving at the network port are directly stored in the image buffer area;
and if the data frames do not reach the network port in sequence, correcting the data frames reaching the network port.
Further, the modifying processing of the data frame arriving at the network port includes the following steps:
setting the length of a retransmission window driven by network filtering to be L, and initially marking all data frames in the retransmission window to be in an empty state;
setting the range of a retransmission window to be [ A1-L, A1], wherein A1 is the maximum detection threshold of the retransmission window;
judging whether the index number X of the data frame arriving at the network port is in the range of a retransmission window or not;
if yes, marking the data frame as a full state, and storing the data frame into the image buffer area;
if not, the data frame is corrected again.
Further, the re-correcting the data frame includes the following steps:
if the index number X of the data frame arriving at the network port is less than A1-L, discarding the data frame;
if the index number X of the data frame arriving at the network port is larger than A1, updating the range of a retransmission window and marking the data frame in a full state;
and detecting whether the updated retransmission window loses frames or not so as to realize the re-correction processing of the data frames.
Further, the detecting whether the updated retransmission window loses frames includes the following steps:
the range of the update retransmission window is [ B1-L, B1], and B1 is the maximum detection threshold of the updated retransmission window;
setting the detection range of frame loss as [ A1-L, B1-L ];
detecting whether a data frame marked as an empty state exists in the [ A1-L, B1-L ];
if yes, the data frame is lost, and the data frame is retransmitted;
if not, the data frame is not lost, and the data frame is stored in the image buffer area.
Further, when performing retransmission processing on the data frame, the method includes the following steps:
setting retransmission timing time of the data frame through a timer set in the network filter driver;
judging whether the retransmitted data frame reaches the network port or not within the retransmission timing time;
if yes, judging whether the data frame meets the filtering criterion;
if not, the data frame is retransmitted again until the retransmitted data frame reaches the network port.
Further, when the data frame is retransmitted, a pakcet _ resend _ max _ count parameter is added, and the retransmitted data frame is not greater than the pakcet _ resend _ max _ count parameter.
The gateway filtering driving method based on the GigE Vision has the advantages that: the network port filtering driving method based on the GigE Vision provided by the structure of the invention can quickly initiate a retransmission request for lost network data frames, has high responsiveness and has shorter time interval between the retransmission data frames and the request data frames. Meanwhile, a timer is set and a pakcet _ resend _ max _ count parameter is added in the network filter driver, so that the network filter driver has high operation efficiency, and even under the condition that the network effective load is close to 90%, the retransmission data packet of the data frame can still be ensured to arrive on time; under the condition of using a Socket interface of a Windows self-carrying device, the defect that the load of a CPU is obviously improved along with the increase of the data transmission speed exists, so that a filter driver registers a callback function in a Windows kernel, calls a filter criterion registered in the callback function, and performs filter processing on each arriving network data frame without an upper layer driver for processing the data of the network data frame, the whole process does not need the participation of the CPU, the utilization rate of the CPU is reduced, and the network transmission speed is improved; by correcting the data frames which do not arrive at the network port in sequence, the problems of data frame disorder, frame loss and the like caused by the switch are effectively solved, and the acquisition quality of the data frames is improved.
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FIG. 1 is a schematic flow chart illustrating steps of a gateway filtering driving method based on GigE Vision according to the present invention;
FIG. 2 is a flowchart illustrating the detailed step of step S32 according to the present invention;
FIG. 3 is a flowchart illustrating the detailed step of step S328 according to the present invention.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Referring to fig. 1, the gateway filtering driving method based on GigE Vision according to the present invention includes the following steps S1 to S4:
s1: installing a network filter driver, and registering a filter criterion of a data frame in a Windows kernel through the network filter driver, wherein the filter criterion comprises a source address of the data frame, a destination address of the data frame, a transmission type of the data frame and a port model of the data frame;
and installing a network filter driver at the PC end, and registering corresponding filter driver entities at all network interfaces (including a wired network and a wireless network) after the installation is successful. And realizing corresponding filtering processing on each data frame reaching the network port through the registered filtering driving entity. The callback function is registered on the Windows kernel, each data frame reaching the internet access can be filtered by calling the filtering criteria registered in the callback function, and the data frames meeting the filtering criteria are sequentially placed in the image buffer area.
And through the registered filtering criteria, the data frame is filtered in a targeted manner, so that operations of filtering, obtaining, processing and the like of different information of the data frame are realized.
The image buffer is used for storing effective network data frames.
S2: the network filtering driver judges whether each data frame reaching the network port meets the filtering criterion;
if yes, go to S3;
if not, go to S4;
s3: directly storing the data frame into a pre-registered image buffer area;
s4: and forwarding the data frame to an upper layer driver.
Through S1-S4, the purpose of filtering the data frames arriving at the internet access is realized, and meanwhile, the data frames which do not accord with the filtering criterion are directly forwarded to the upper layer drive, so that the network congestion phenomenon caused by the accumulation of the data frames which do not accord with the filtering criterion on the internet access filtering drive is avoided, and the transmission efficiency and the quality of the network are improved.
When the data frame is directly stored in the pre-registered image buffer in step S3, the network filter driver stops forwarding the data frame to the upper layer driver.
Further, before the data frame is directly stored in the pre-registered image buffer in step S3, the sequence detection of each data frame arriving at the portal is performed, where the sequence detection includes the following steps: s31 to S32.
S31: if the data frames arrive at the network port in sequence, the data frames arriving at the network port are directly stored in the image buffer area;
s32: and if the data frames do not reach the network port in sequence, correcting the data frames reaching the network port.
Logically, all data frames arriving at the network port arrive in sequence, but due to frame loss possibly existing in conditions of network fluctuation, network congestion and the like, the data frames arriving at the network port have the phenomena of disorder and frame loss, so that the data frames arriving at the network port need to be sequentially detected so that the data frames stored in the image buffer area are stored in sequence.
As shown in fig. 2, further, step S32: if the data frames do not arrive at the network port in sequence, the method performs modification processing on the data frames arriving at the network port, including the following steps S321 to S328:
s321: setting the length of a retransmission window driven by network filtering to be L, and initially marking all data frames in the retransmission window asEmpty state, i.e. Packeti＝empty(i＝[1…L])；
S322: setting the range of a retransmission window as [ A1-L, A1], wherein AI represents the maximum detection threshold of the retransmission window, and when the maximum detection threshold is exceeded, the index number X of the data frame reaching the network port is not in the range of [ A1-L, A1 ];
since the network filter driven maintenance length is L, i.e. the retransmission window range is a1-L, a 1.
S323: judging whether the index number X of the data frame arriving at the network port is in the range of a retransmission window or not;
if yes, go to S324;
if not, the process goes to S325;
s324: marking the data frame as a full state and storing the data frame into the image buffer area;
s325: and judging whether the index number X of the data frame arriving at the network port is less than A1-L.
If yes, go to S326;
if not, go to S327;
s326: discarding the data frame;
when the index number X of the data frame arriving at the network port is less than a1-L (minimum retransmission window), it indicates that the data frame captured by the retransmission window is the data frame that has been collected, and therefore the data frame that is less than the minimum retransmission window is discarded to avoid acquiring duplicate data packets.
S327: updating the range of a retransmission window and marking the data frame as a full state;
for step S327, since the index number X of the data frame is neither in the range of [ a1-L, a1] nor less than a1-L, it can be unambiguously determined that the index number X of the data frame is greater than a1, i.e. the index number X of the data frame is greater than the maximum value of the retransmission window.
Thus, when the index number X is greater than the retransmission window maximum, the range of the retransmission window is updated and the data frame is marked as full.
S328: and detecting whether the updated retransmission window loses frames or not so as to realize the correction processing of the data frames arriving at the network port.
Through steps S321 to S328, the data frames that do not arrive at the network port in sequence are corrected, so that the data frames entering the image buffer are stored in sequence, and the data frame acquisition error caused by disorder is avoided.
As shown in fig. 3, further, the step S328: detecting whether the updated retransmission window loses frames or not, including the following steps S3281 to S3285:
s3281: the range of the update retransmission window is [ B1-L, B1], and B1 is the maximum detection threshold of the updated retransmission window;
in order to detect whether the retransmission window loses frames more clearly, at this time, B1 is the index number X of the data frame arriving at the network port, and the retransmission window is updated based on the index number X, so as to detect whether there is a frame loss phenomenon to a greater extent.
Since the network filtering driver has a maintenance length of L, i.e. the range of the retransmission window after update is B1-L, B1.
S3282: setting the detection range of frame loss as [ A1-L, B1-L ];
since the updated retransmission window has a range of [ B1-L, B1] and the original retransmission window has a range of [ a1-L, a1], that is, the retransmission window moves by a distance of B1-a1, data frame detection needs to be performed on the range formed by the distance, that is, the data frame detection range is [ a1-L, B1-L ].
S3283: detecting whether a data frame marked as an empty state exists in the [ A1-L, B1-L ];
if yes, the process goes to S3284;
if not, the process goes to S3285;
s3284: carrying out retransmission processing on the data frame;
s3285: and stores the data frame in the image buffer.
As can be seen from steps S3281 to S3285, when the range of the retransmission window is updated, the data frame is marked as full, and when a data frame with a data frame marked as empty is detected in the range of [ a1-L, B1-L ], it indicates that the data frame is lost, and the data packet needs to be requested to be retransmitted to the network interface industrial camera. When the data frame marked as the empty state in the range of [ A1-L, B1-L ] is not detected, the phenomenon that the data frame is lost does not exist, the request for retransmitting the data packet to the network port industrial camera is not needed, and the data frame is stored in the image buffer area.
Further preferably, the step S3284: the retransmission processing is performed on the data frame, and the steps E1 to E4 are as follows:
e1: setting retransmission timing time of the data frame through a timer set in the network filter driver;
e2: judging whether the retransmitted data frame reaches the network port or not within the retransmission timing time;
if yes, go to step E3;
if not, go to step E4;
e3: proceeding to step S2;
e4: and retransmitting the data frame again until the retransmitted data frame reaches the network port.
Through steps E1 to E4, for the retransmitted data packet of each data frame, the network filter driver maintains a timer for the retransmitted data frame, and sets a reasonable timing time for the retransmitted data frame through the timer, and when the retransmitted data frame does not arrive within the timing time set by the timer, the network filter driver sends the retransmitted data frame instruction again and starts the timer until the retransmitted data frame arrives at the network port. If the retransmitted data frame arrives at the network port within the timing time set by the timer, the process proceeds to step S2: the network filtering driver judges whether each data frame reaching the network port meets the filtering criterion, and the retransmission data frame and the normal data frame are correspondingly filtered together by the method, so that the acquisition of the retransmission data frame and the sequential storage in the image buffer area are realized.
Further, when the data frame is retransmitted, a pakcet _ resend _ max _ count parameter is added, and the total number of retransmitted data frames is not greater than the pakcet _ resend _ max _ count parameter. The parameter of packet _ resend _ max _ count indicates the maximum number of retransmitted frames per frame of data, and if 10000 data frames need to be transmitted per frame of data, setting packet _ resend _ max _ count to 2000 indicates that 2000 data frames can be retransmitted at most.
For the retransmission method, a large number of data frames may be requested to retransmit data packets under the condition of network congestion, which may cause a phenomenon of network environment deterioration, in order to avoid the phenomenon, a pakcet _ resend _ max _ count parameter is added in a network filter driver, and by setting the parameter, the total number of retransmitted data packets of retransmitted data frames is ensured not to be greater than the parameter, and meanwhile, the sum of the retransmission data packet sending speed and the normal data frame sending speed is made to be less than the network transmission maximum speed, so that the possibility of network congestion is avoided.
Description of the drawings: two programs on the network effect the exchange of data via a bidirectional communication link, one end of which is called a socket.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (2)

1. A mesh filtering driving method based on GigE Vision is characterized by comprising the following steps:
installing a network filter driver, and registering a filter criterion of a data frame in a Windows kernel through the network filter driver;
the network filtering driver judges whether each data frame reaching the network port meets the filtering criterion;
if yes, directly storing the data frame into a pre-registered image buffer area;
if not, forwarding the data frame to an upper layer driver;
before the data frame is directly stored in a pre-registered image buffer area, each data frame arriving at the network port is sequentially detected, and the sequential detection comprises the following steps:
if the data frames arrive at the network port in sequence, the data frames arriving at the network port are directly stored in the image buffer area;
if the data frames do not reach the network port in sequence, setting the length of a retransmission window driven by network filtering to be L, and initially marking all the data frames in the retransmission window to be in an empty state;
setting the range of a retransmission window to be [ A1-L, A1], wherein A1 is the maximum detection threshold of the retransmission window;
judging whether the index number X of the data frame arriving at the network port is in the range of a retransmission window or not;
if yes, marking the data frame as a full state, and storing the data frame into the image buffer area;
if not, the data frame is corrected again;
wherein, the re-correcting process for the data frame includes the following steps:
if the index number X of the data frame arriving at the network port is less than A1-L, discarding the data frame;
if the index number X of the data frame arriving at the network port is larger than A1, updating the range of a retransmission window and marking the data frame in a full state;
detecting whether the updated retransmission window loses frames or not so as to realize the re-correction processing of the data frames;
wherein, the detecting whether the updated retransmission window loses frames comprises the following steps:
the range of the update retransmission window is [ B1-L, B1], and B1 is the maximum detection threshold of the updated retransmission window;
setting the detection range of frame loss as [ A1-L, B1-L ];
detecting whether a data frame marked as an empty state exists in the [ A1-L, B1-L ];
if yes, the data frame is lost, and the data frame is retransmitted;
if not, the data frame is not lost, and the data frame is stored in the image buffer area;
wherein, when the retransmission processing is performed on the data frame, the method includes the following steps:
setting retransmission timing time of the data frame through a timer set in the network filter driver;
judging whether the retransmitted data frame reaches the network port or not within the retransmission timing time;
if yes, judging whether the data frame meets the filtering criterion;
if not, the data frame is retransmitted again until the retransmitted data frame reaches the network port.
2. The GigE Vision-based portal filtering driving method according to claim 1, wherein a pakcet _ resend _ max _ count parameter is added when the data frame is retransmitted, and the retransmitted data frame is not greater than the pakcet _ resend _ max _ count parameter.
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基于GigE Vision相机的嵌入式图像采集系统的设计;彭佩红;《中国优秀硕士学位论文全文数据库》;20170215;第10-15页 *

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