CN114070796B - Electronic device and frame transmission method for electronic device - Google Patents

Abstract

Embodiments of the present disclosure relate to an electronic device and a frame transmission method for the electronic device. The frame transmission method includes the following steps: connecting with another electronic device; receiving a pause frame from the other electronic device, wherein the pause frame includes multiple a data packet size range and corresponding multiple pause times; refer to the content of the pause frame, and according to which of the multiple data packet size ranges the size of the first data packet to be sent to the other electronic device belongs to at present One, to determine the first frame interval; and after the first frame containing the first data packet is sent to the other electronic device, wait at least the first frame interval before starting to send the second frame to the other electronic device electronic device.

Description

Electronic device and frame transmission method for electronic device

technical field

The present invention relates to a frame transmission method for an electronic device.

Background technique

In the IEEE 802.3x specification, a pause frame (pause frame) is mentioned for the receiving end to transmit to the transmitting end when the network is congested, so as to inform the transmitting end to suspend the transmission of data packets to alleviate the congestion; in addition, the transmitting end needs Only after the pause time indicated by the pause frame expires, or the receiving end sends another data packet to notify that the data packet can continue to be received, can the data packet be transmitted to the receiving end again. However, in the above-mentioned operations, when the network is congested, the transmitting end will always switch between full-speed transmission and pause transmission when transmitting data packets, thus resulting in extremely uneven flow of data packets. In addition, the receiving end needs to constantly detect the status of the current data packet buffer to transmit the pause frame in real time, which also causes a processing burden on the circuit of the receiving end.

Contents of the invention

Therefore, one of the objectives of the present invention is to propose a data packet transmission method for network devices, which can adjust the pause time after subsequent data packet transmission according to the size of the data packet, so that the overall traffic is relatively average, to avoid sending The terminal transmits too many data packets instantaneously, which causes congestion or data packet accumulation at the receiving end.

In one embodiment of the present invention, a frame transmission method for an electronic device is disclosed, which includes the following steps: connecting with another electronic device; receiving a pause frame from the other electronic device, wherein the pause The frame includes multiple data packet size ranges and corresponding multiple pause times; refer to the content of the pause frame and belong to the multiple data packet sizes according to the size of the first data packet currently to be sent to the other electronic device which one of the ranges to determine the first frame interval; and after the first frame containing the first data packet is sent to the other electronic device, wait at least the first frame interval before starting to send the second frame to the other electronic device.

In another embodiment of the present invention, an electronic device is disclosed, comprising: a receiving circuit, a frame interval controller, and a transmitting circuit. The receiving circuit is used to receive a pause frame from another electronic device, wherein the pause frame includes multiple data packet size ranges and corresponding multiple pause times; the frame interval controller is used to refer to the content of the pause frame, and according to the current Which one of the plurality of data packet size ranges does the size of the first data packet to be sent to the other electronic device belong to, so as to determine the first frame interval; and the transmission circuit is used to transmit the first data packet containing the first data packet to the other electronic device, and after the first frame is sent, at least wait for the first frame interval before starting to send the second frame to the another electronic device.

In another embodiment of the present invention, a frame transmission method for an electronic device is disclosed, which includes the following steps: connecting with another electronic device; transmitting a pause frame to the other electronic device, wherein the pause The frame includes multiple data packet size ranges and corresponding multiple pause times for use by the other electronic device; and receiving multiple frames from the other electronic device, wherein the distance between the multiple frames is determined by the other electronic device The electronic device determines according to the multiple data packet size ranges included in the pause frame and the corresponding multiple pause times.

In another embodiment of the present invention, an electronic device including a transmitting circuit and a receiving circuit is disclosed. The sending circuit is used to send a pause frame to another electronic device, wherein the pause frame includes multiple data packet size ranges and corresponding multiple pause times for use by the other electronic device; and the receiving circuit is used for receiving from the other electronic device The other electronic device receives multiple frames, wherein the distance between the multiple frames is determined by the other electronic device according to the multiple data packet size ranges included in the pause frame and the corresponding multiple pause times.

Description of drawings

FIG. 1 is a schematic diagram of a network system according to an embodiment of the invention.

FIG. 2 is a flowchart of a frame transmission method for an electronic device according to an embodiment of the invention.

FIG. 3 is a schematic diagram of a pause frame according to an embodiment of the invention.

Detailed ways

FIG. 1 is a schematic diagram of a network system according to an embodiment of the invention. As shown in Figure 1, the network system includes electronic devices 110, 120, wherein the electronic devices 110, 120 are connected by a network cable 130 for data transmission and reception, and in this embodiment, the electronic devices 110, 120 support full Duplex Ethernet (Full-Duplex Ethernet), and supports IEEE802.3x specification. The electronic device 110 includes a processing circuit 111, a receiving circuit 112, a pause frame parser 114, a frame interval controller 116, and a transmission circuit 118; and the electronic device 120 includes a processing circuit 121, a receiving circuit 122, A pause frame parser 124 , an interframe controller 126 and a transmission circuit 128 . The electronic devices 110 and 120 in this embodiment can be any electronic devices that can use network cables for data transmission and reception, such as switches, routers, or any electronic devices that can be connected to network cables.

In the operation of the electronic device 110 , refer to the flowchart shown in FIG. 2 at the same time. In step 200, the process starts, and the electronic device 110 establishes a connection with the electronic device 120 and starts to transmit and receive signals. In step 202, the receiving circuit 112 receives the frame/data packet from the electronic device 120 through the network cable 130, and analyzes the received frame and sends it to the processing circuit 111 for subsequent processing. In this embodiment, the receiving circuit 112 receives a pause frame from the electronic device 120, and transmits the pause frame to the pause frame parser 114 for parsing. In step 204 , the pause frame parser 114 analyzes the received pause frame and determines whether the pause frame conforms to a specific format, if not, the process goes to step 206 ; if yes, the process goes to step 208 . Specifically, referring to the schematic diagram of a pause frame 300 conforming to a specific format according to an embodiment of the present invention shown in FIG. preamble), 1-byte start frame delimiter (Start Frame Delimiter, SFD), 6-byte destination address (destination address), 6-byte source address (source address), 2-byte type (type) , 2-byte operation code (opcode), 2-byte frame interval control index, time information #0, #1~#N...etc. It should be noted that the preamble, frame start delimiter, destination address, source address, type and operation code in the pause frame 300 shown in FIG. Refer to the IEEE 802.3x specification. In this embodiment, since only part of the codewords are defined for the 2-byte opcode in the IEEE 802.3x specification, the pause frame 300 can be set to a value that is not yet defined in the current IEEE 802.3x specification. A code word, such as 0xff, to indicate that the pause frame 300 has a specific format. In this embodiment, if the content of the operation code has been defined in the current IEEE 802.3x specification, such as the operation code 0x0001, then the pause frame parser 114 judges that the received pause frame does not conform to a specific format; If the content of the code conforms to a code word corresponding to a specific format, such as 0xff, then the pause frame parser 114 judges that the received pause frame conforms to the specific format.

In step 204, it is determined that the main content of the pause frame 300 conforming to the specific format is the operation code, the frame spacing control index and the part of time information #0~#N, and the operation and definition of the remaining fields can refer to the IEEE 802.3x specification. Therefore, the following description mainly focuses on the operation code, the inter-frame control index and the time information #0-#N.

In step 206, since the pause frame received by the receiving circuit 112 conforms to the IEEE 802.3x specification, the operation of the electronic device 110 can skip the frame interval controller 116, and the transmission circuit 118 suspends the transmission of subsequent frames until the pause Until the pause time indicated in the frame expires, or the receiving circuit 112 receives a message that the transmission can be restarted.

In step 208, the frame spacing controller 116 temporarily stores the frame spacing control indicators and time information #0-#N shown in FIG. 3 in an internal register or memory for determining the frame spacing for subsequent frame transmission. Specifically, the frame spacing control index and time information #0-#N can be regarded as including a plurality of data packet size ranges and corresponding pause times as a whole, and when the processing circuit 111 needs to transmit data to the electronic device 120 , the transmission circuit 118 will transmit the relevant information about the size of the data packet to be transmitted to the interframe controller 116, and the interframe controller 116 determines the corresponding pause time according to the size of the data packet to be sent to the electronic device 120 at present, The frame interval is determined accordingly, so that the transmission circuit 118 pauses for a period of time (ie, the frame interval) after transmitting the current data packet to the electronic device 120 before starting to transmit the next frame. In this embodiment, the data packet size may be the size of a data packet contained in the frame at the network layer or the data link layer.

In one embodiment, the interframe control index of the pause frame 300 may be used to represent multiple data packet size ranges. For example, the frame spacing control index includes 2 bytes (16 bits), of which the 0th to 3rd bits can be used to represent 16 or less valid index values, and the 4th to 15th bits can be used to Indicates a parameter INC, wherein the range of data packet size represented by the frame spacing control index can be shown in Table 1 below:

index value Data packet size range 0 PKT_S<64B 1 64≤PKT_S<64+INC 2 64+INC≤PKT_S<64+2*INC 3 64+2*INC≤PKT_S<64+3*INC … … 15 64+14*INC≤PKT_S

Table I

In the content of Table 1, "PKT_S" is used to represent the size of the data packet, "B" is used to represent the byte, and the parameter INC can be any suitable value, such as 64 bytes.

In one embodiment, each of the time information #0～#N includes 2 bytes (16 bits), wherein the 0th to 3rd bits can be used to represent the pause time related to the size of the data packet, and the 0th bit ~3 bits can be used to indicate the pause time calculated using the data packet size, and the 4th to 15th bits can be used to represent a fixed pause time, wherein the time information #0~#N can be shown in Table 2 below:

Table II

In the content of Table 2, time information #0 corresponds to the index value "0" of Table 1, time information #1 corresponds to the index value "1" of Table 1, and time information #2 corresponds to the index value "2" of Table 1 ", ... and so on. "T" is used to indicate the length of the pause time, wherein "T" can be 8 bit time (bit time), and the bit time is the time required for the electronic device 100 to transmit 8-bit data; for example, for 100Mbps (Million bits per second, megabits per second) Ethernet, 1 bit time is 10 nanoseconds; and for 1000Mbps Ethernet, 1 bit time is 1 nanosecond. In addition, the pause time calculated using the data packet size can directly take the integer part of the calculation result, and the pause time of time information #0~#N is the difference between the pause time calculated using the data packet size and the fixed pause time in Table 2 sum.

In one example, assuming that the transmission circuit 118 is currently preparing to transmit a 130-byte data packet to the electronic device 120, when the parameter INC is set to 64 bytes, since the data packet size corresponds to the index value "2" in Table 1, therefore, The calculation of the pause time corresponds to the time information #2 in Table 2, where the pause time calculated using the data packet size is 65*T, and the fixed pause time is 2*T. Therefore, the pause time calculated by Table 2 The time is 67*T.

After determining the pause time of the frames to be transmitted by the transmission circuit 118, the frame interval controller 116 may determine the frame interval according to the pause time. Specifically, since IEEE802.3x defines a minimum default interval of at least 96 bit times for the interval between two consecutive frames, the frame interval controller 116 can add 96 to the above-mentioned pause time calculated according to Table 2 bit times to get the final frame spacing. For example, assuming that the transmitting circuit 118 is currently preparing to transmit a 130-byte data packet to the electronic device 120, and the pause time calculated according to Table 2 is 67*8 bit time, the frame spacing finally determined by the frame spacing controller 116 is (96+67*8) bit times.

It should be noted that the above calculation of the pause time and the frame interval is only an example and not a limitation of the present invention, as long as the frame interval controller 116 can determine different frame intervals according to the size of the data packet to be transmitted at present, The contents of the above Table 1 and Table 2 can be modified accordingly, or can be integrated into a single lookup table to directly determine the corresponding frame spacing according to the size of the data packet, and these related implementation changes should belong to the scope of the present invention .

In step 210 , the transmitting circuit 118 transmits the frame to the electronic device 120 , and the process returns to step 208 . In addition, after the frame transmission is completed, the transmission circuit 118 will pause for a period of time before transmitting the next frame, so that the next frame and the currently transmitted frame have the above-mentioned determined frame distance. In detail, assuming that the transmitting circuit 118 needs to transmit the first frame, the second frame and the third frame in sequence, the frame interval controller 116 can determine the first frame interval corresponding to the first frame and the frame interval corresponding to the second frame according to the above mechanism. The second interframe interval for two frames, such that the first frame does not start transmitting the second frame until after the end of its transmission for a pause of the first interframe interval, and the second frame does not start transmitting until after the second frame pauses for the second interframe interval. Start transmitting the third frame.

It should be noted that if the pause frame transmitted by the electronic device 120 is the pause frame 300 shown in FIG. The pause time or the information of the frame interval is temporarily stored in it, and then whenever the transmission circuit 118 is to send a data packet, the frame interval controller 116 will determine the frame interval between each data packet after transmission and the next frame one by one , so as to accurately control the network traffic transmitted from the electronic device 110 to the electronic device 120, so that the problem of severe uneven transmission speed of the electronic device 110 in the prior art can be avoided. In addition, because the data packet size range recorded in the pause frame 300 and the corresponding pause time or frame interval information are temporarily stored in the internal memory or the temporary register in the frame interval controller 116 for subsequent long-term use, the electronic device 120 may not need to send a pause frame to the electronic device 110 frequently, but only needs to transmit a new pause frame 300 to update the data packet size range and the corresponding pause time or frame when necessary (for example, a sudden network congestion occurs) interval, so that each data packet has a larger frame interval after transmission.

In addition, since the speed of the network interface of the electronic device 110, 120 cannot be higher than the Committed Information Rate (CIR) of the network provider, if the electronic device 110, 120 uses the highest speed for transmission, it will cause The electronic devices 110, 120 are continuously switching between full speed transmission and pause transmission. Therefore, the electronic device 120 can determine the data packet size range and the corresponding pause time or frame interval information according to the above-mentioned committed information rate, and transmit these information to the electronic device 110 after the pause frame 300, so that the electronic device The traffic between 110 and 120 is relatively average.

In the description of the above embodiments, the electronic device 110 receives the pause frame from the electronic device 120, determines the frame interval according to the size of the data packet, and then transmits the frame to the electronic device 120. Duplex Ethernet, so similarly, the electronic device 120 can also receive the pause frame from the electronic device 110 and transmit the frame to the electronic device 110 after determining the frame interval according to the size of the data packet. Due to the same or similar operations, that is, the processing circuit 121, receiving circuit 122, pause frame parser 124, frame interval controller 126, and transmitting circuit 128 of the electronic device 120 operate similarly to the processing circuit 111, receiving circuit 128 of the above-mentioned electronic device 110. The circuit 112 , the pause frame parser 114 , the frame interval controller 116 and the transmission circuit 118 , so the relevant details will not be repeated here.

To briefly summarize the present invention, in the electronic device and related frame transmission method of the present invention, after receiving a pause frame from another electronic device, the frame interval controller inside the electronic device can group data according to the data recorded in the pause frame The size range and the corresponding pause time are used to determine the frame spacing required after subsequent frames are transmitted. Through the present invention, the traffic between electronic devices can be properly controlled, so as to avoid the problem in the prior art that when the network is congested, the frame transmission will always switch between the two states of full speed transmission and pause transmission, and another electronic device There is also no need to transmit pause frames all the time to cause a processing burden.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

【Symbol Description】

110: Electronic device

111: Processing circuit

112: Receive circuit

114:Pause frame parser

116:Frame spacing controller

118: transmission circuit

120: electronic device

121: processing circuit

122: Receive circuit

124:Pause frame parser

126:Frame spacing controller

128: transmission circuit

130: network cable

200～210: steps

300: pause frame

Claims (10)

1. A frame transfer method for an electronic device, comprising:

wiring with another electronic device;

receiving a pause frame from the other electronic device, wherein the pause frame comprises a plurality of data packet size ranges and a corresponding plurality of pause times;

referencing the content of the pause frame and determining a first inter-frame distance according to which of the plurality of data packet size ranges the size of a first data packet currently to be sent to the other electronic device belongs; and

after a first frame containing the first data packet is sent to the other electronic device, a second frame is sent to the other electronic device beginning after waiting at least the first inter-frame distance.

2. The frame transmission method of claim 1, further comprising:

referencing the content of the pause frame and determining a second inter-frame distance according to which of the plurality of data packet size ranges the size of a second data packet currently to be sent to the other electronic device belongs; and

after the second frame including the second data packet is transmitted to the other electronic device, a third frame is transmitted to the other electronic device after waiting at least the second inter-frame distance.

3. The frame transfer method according to claim 1 or 2, wherein the plurality of suspension times are not identical.

4. The frame transfer method of claim 3, wherein the step of referencing the content of the pause frame and determining the first inter-frame distance according to which of the plurality of data packet size ranges the size of the first data packet currently to be sent to the other electronic device belongs comprises:

determining a first pause time according to which of the plurality of data packet size ranges the size of the first data packet currently to be sent to the other electronic device belongs; and

and calculating the first frame interval according to the first pause time and the minimum preset interval.

5. The frame transfer method of claim 4, wherein determining the first pause time based on which of the plurality of data packet size ranges the size of the first data packet currently to be sent to the other electronic device belongs comprises:

determining a pause time calculated using a data packet size and a fixed pause time according to which of the plurality of data packet size ranges the size of the first data packet currently to be sent to the other electronic device belongs; and

the first pause time is calculated from the pause time calculated using the data packet size and the fixed pause time.

6. The frame transmission method of claim 1, further comprising:

and temporarily storing the size ranges of the data packets and the corresponding pause times contained in the pause frame in the electronic device so as to determine the frame spacing corresponding to a plurality of frames which are subsequently transmitted to the other electronic device.

7. An electronic device for connecting with another electronic device, the electronic device comprising:

a receiving circuit configured to receive a pause frame from the other electronic device, wherein the pause frame includes a plurality of data packet size ranges and a corresponding plurality of pause times;

an interframe space controller for referencing the content of the pause frame and determining a first interframe space according to which of the plurality of data packet size ranges the size of a first data packet currently to be sent to the other electronic device belongs; and

and a transmitting circuit for transmitting a first frame containing the first data packet to the other electronic device, and starting to transmit a second frame to the other electronic device after the first frame is transmitted and at least waiting for the first frame interval.

8. The electronic device of claim 7, wherein the interframe space controller references the content of the pause frame and determines a second interframe space based on which of the plurality of data packet size ranges the size of a second data packet currently to be sent to the other electronic device belongs to; and after the second frame containing the second data packet is sent to the other electronic device, the transmitting circuit starts transmitting a third frame to the other electronic device after waiting at least the second frame interval.

9. A frame transfer method for an electronic device, comprising:

wiring with another electronic device;

transmitting a pause frame to the other electronic device, wherein the pause frame comprises a plurality of data packet size ranges and a corresponding plurality of pause times for the other electronic device to use; and

a plurality of frames is received from the other electronic device, wherein a spacing of the plurality of frames is determined by the other electronic device according to the plurality of data packet size ranges and the corresponding plurality of pause times included in the pause frame.

10. An electronic device for connecting with another electronic device, the electronic device comprising:

a transmitting circuit configured to transmit a pause frame to the other electronic device, wherein the pause frame includes a plurality of data packet size ranges and a corresponding plurality of pause times for the other electronic device; and

a receiving circuit is configured to receive a plurality of frames from the other electronic device, wherein a spacing of the plurality of frames is determined by the other electronic device according to the plurality of data packet size ranges and the corresponding plurality of pause times included in the pause frame.