CN106506403A - A Fiber Channel Protocol Data Generation Method with Interactive Capability - Google Patents

Abstract

The invention discloses a kind of fiber channel protocol data method for generation with interaction capabilities, is that each sending port arranges transmit queue, and distributes memory space for each transmit queue；A transmit queue is selected, the frame data, primitive, wait condition or time delay required for insertion；The sending method of transmit queue is set；Start after sending, during data in transmit queue are write successively by DDR corresponding buffering areas, the transmission data in DDR are read by FPGA, transmission types are judged according to control word, if condition is to wait for, wait the protocol data for receiving to meet condition after, data below are retransmited；If time delay then awaiting a specified time is retransmited；If protocol data is then assembled according to the frame format of standard and is sent by primitive or frame data.The method has feedback capability, can wait and receive certain certain types of frame, and primitive or mistake retransmit data below, or waits for a period of time and retransmit.

Description

A Fiber Channel Protocol Data Generation Method with Interactive Capability

technical field

The invention relates to a fiber channel bus protocol testing technology, belongs to the field of bus protocol testing, and in particular relates to a channel protocol data generation method with interactive capability.

Background technique

With its ultra-high-speed transmission rate (up to 10Gbps transmission rate), good anti-interference performance, stable transmission quality and other characteristics, fiber channel technology is widely used in aviation communication, mass data storage and other fields. Demand is high. How to simulate the data generation of actual fiber channel equipment is one of the key technologies of fiber channel bus protocol testing. In the current general fiber channel protocol test, a group of frame data or primitives are edited, and they are sent in a certain order in a loop or a single time. They do not have feedback capabilities, that is, they cannot selectively send certain frames according to the received data, especially when When it is necessary to simulate some command-response high-level protocols, this simple protocol data transmission method cannot well simulate the communication situation of actual fiber channel equipment.

Contents of the invention

In order to solve the above problems, a method for generating fiber channel protocol data with interactive capabilities is provided. The method has feedback capabilities and can wait for a certain type of frame, primitive or error to be received before sending, or delay for a period of time before sending , and at the same time classify the sending data according to the priority, you can send a group of frames cyclically or send a group of frames at a time. The data generation function of the fiber channel protocol realized by this method can well simulate the communication situation of the actual fiber channel equipment, and test and analyze more accurately.

In order to achieve the above object, the present invention adopts the following technical solutions:

A method for generating fiber channel protocol data with interactive capability, comprising FPGA and DDR connected with FPGA, comprising the following steps:

Set up sending queues with different priority levels for each sending port, and allocate storage space for each sending queue;

Select a send queue and insert the required frame data, primitives, waiting conditions or delay;

Set the sending mode of the sending queue;

After the sending is started, the data in the sending queue is sequentially written into the DDR corresponding buffer controlled by the FPGA, and the FPGA reads the sending data in the DDR, judges the sending type according to the control word, and waits for the received protocol if it is a waiting condition After the data meets the conditions, send the following data; if it is a delay, wait for the specified time before sending; if it is primitive or frame data, assemble and send the protocol data according to the standard frame format.

Set up three sending queues for each sending port, namely sending queue 1, sending queue 2, and sending queue 3. Sending queue 1 has the highest priority and sending queue 3 has the lowest priority.

Each sending queue is stored in units of 4 bytes in the allocated storage space; when the space is full, no more sending data can be inserted.

Errors can be inserted into the frame data, including CRC, Disparity, long frame, and short frame.

When inserting a receive wait condition, the conditions that can be set include: frame delimiter, frame content, error or primitive.

The three conditions of frame delimiter, frame content and error can be logically combined with OR, and then ORed with the primitive selection condition to form a waiting condition.

The frame delimiter includes selecting a SOF or EOF; the frame content includes setting offset position, four-byte data word, four-byte mask; the error includes CRC, Disparity, short frame, wrong frame .

The sending mode of the sending queue includes cyclic or single.

When set to cyclic sending mode, the data in the queue will be sent cyclically, and the data in the queue with a lower priority will not be sent;

When set to single mode, after sending the data in this queue, send the data in the next sending queue lower than the priority of this sending queue.

In the buffer, each 4-byte protocol data word corresponds to a 4-byte control word.

Beneficial effects of the present invention:

1. A method for generating fiber channel protocol data in an interactive manner, which can wait for a specific type of frame or primitive to be sent before sending a set of protocol data, or can be delayed for a period of time before sending. At the same time, the sending data is classified according to the priority, and a group of data can be sent cyclically or a group of data can be sent at a time.

2. The method of the present invention has feedback capability, and this data generation method can better simulate the actual fiber channel bus equipment, especially the communication mode with command-response mode high-layer protocol, so that the performance test of the fiber channel equipment is more accurate.

Description of drawings

Fig. 1 is a flow chart of interactive mode protocol data generation;

Figure 2 is a schematic diagram of receiving waiting conditions.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

This embodiment provides a kind of system that the present invention implements, a kind of multi-port Fiber Channel bus protocol test system, comprises FPGA and the DDR that is connected with FPGA, the GTX interface of FPGA is connected with optical fiber module, and FPGA completes data generation and capture function . The system has the functions of fiber channel bus protocol data generation, data capture and protocol analysis, and can test and analyze fiber channel devices and networks.

With reference to the data generation flowchart of Fig. 1, a kind of fiber channel protocol data generation method with interactive capability comprises the following steps:

(1) Three sending queues are set for each sending port, the three queues have different sending priorities, sending queue 1 has the highest priority, and sending queue 3 has the lowest priority. Each queue allocates a certain amount of storage space, in units of 4 bytes. When the space is full, no more data can be inserted and sent.

(2) Select a sending queue, insert required frame data, primitives, waiting conditions or delay; and errors (CRC, Disparity, long frame, short frame) can be inserted into the frame data.

(3) When inserting the receiving waiting condition, the following conditions can be set: frame delimiter (choose a certain SOF, EOF), frame content (set offset position, four-byte data word, four-byte mask), Error (CRC, Disparity, short frame, wrong frame) or primitive; the three conditions of frame delimiter, frame content and error can be logically combined with OR, and then OR with the primitive selection condition to form a waiting condition, see figure 2.

(4). Set the sending mode of the sending queue: cycle or single.

(5), after the transmission is started, the data in the three transmission queues are written in the DDR corresponding buffer controlled by the FPGA in sequence, and each 4-byte protocol data word corresponds to a 4-byte control word. The sending data in DDR is read by FPGA, and the sending type is judged according to the control word. If it is a waiting condition, wait for the received protocol data to meet the conditions, and then send the following data; if it is a delay, wait for the specified time before sending; if If it is primitive language or frame data, the protocol data is assembled and sent according to the standard frame format.

(6) If it is set to cyclic sending mode, the data in the queue will be sent cyclically, and the data in the queue with a lower priority will not be sent; if the single mode is selected, after the data in the queue is sent, Send data from the next send queue lower than this send queue priority.

You can wait to receive a certain type of frame, primitive or error before sending a set of protocol data, or you can delay sending it for a period of time. At the same time, the sending data is classified according to the priority, and a group of data can be sent cyclically or a group of data can be sent at a time.

The reception waiting conditions are divided into four groups: frame delimiter (SOF/EOF), frame content, error and primitive, among which the three conditions of frame delimiter, frame content and error can be logically combined with or, and then combined with the original The language selection condition is ORed to form a waiting condition.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (10)

1. a kind of fiber channel protocol data method for generation with interaction capabilities, the DDR being connected including FPGA and with FPGA, its It is characterized in that, comprises the following steps：

Arrange for each sending port and there is the other transmit queue of different priorities, and empty for each transmit queue distribution storage Between；

A transmit queue is selected, the frame data, primitive, wait condition or time delay required for insertion；

The sending method of transmit queue is set；

Start after sending, the data in transmit queue are write successively in the DDR corresponding buffering areas controlled by FPGA, read by FPGA The transmission data in DDR being taken, transmission types being judged according to control word, the protocol data for receiving is waited if condition is to wait for After meeting condition, data below are retransmited；If time delay then awaiting a specified time is retransmited；If primitive or frame number According to then protocol data being assembled according to the frame format of standard and is sent.

2. a kind of fiber channel protocol data method for generation with interaction capabilities as claimed in claim 1, is characterized in that, be per Individual sending port arranges three transmit queues, respectively transmit queue 1, transmit queue 2, transmit queue 3, and transmit queue 1 is preferential Level highest, 3 priority of transmit queue are minimum.

3. a kind of fiber channel protocol data method for generation with interaction capabilities as claimed in claim 2, is characterized in that, each Transmit queue is stored in the memory space of distribution in units of 4 bytes；After space is full, it is impossible to be inserted into sending data.

4. a kind of fiber channel protocol data method for generation with interaction capabilities as claimed in claim 1, is characterized in that, described Energy inserting error in frame data, including CRC, Disparity, long frame, short frame.

5. a kind of fiber channel protocol data method for generation with interaction capabilities as claimed in claim 1, is characterized in that, insert When receiving wait condition, the condition that can be arranged includes：Frame delimiter, content frame, mistake or primitive.

6. a kind of fiber channel protocol data method for generation with interaction capabilities as claimed in claim 5, is characterized in that, frame is fixed Three conditions of boundary's symbol, content frame and mistake can carry out with or logical combination, then carry out with primitive alternative condition or, forming wait Condition.

7. a kind of fiber channel protocol data method for generation with interaction capabilities as claimed in claim 5, is characterized in that, described Frame delimiter includes selecting a kind of SOF or EOF；The content frame includes arranging deviation post, nybble data word, four bytes Mask；The mistake includes CRC, Disparity, short frame, wrong frame.

8. a kind of fiber channel protocol data method for generation with interaction capabilities as claimed in claim 1, is characterized in that, described The sending method of transmit queue includes circulation or single.

9. a kind of fiber channel protocol data method for generation with interaction capabilities as claimed in claim 8, is characterized in that, arrange For cycling through during mode, the data in the queue are cycled through, priority will not be sent less than the data in this queue；

When being set to single mode, after complete for the data is activation of the queue, the next one less than this transmit queue priority is sent Data in transmit queue.

10. a kind of fiber channel protocol data method for generation with interaction capabilities as claimed in claim 1, is characterized in that, In relief area, the protocol data word of each 4 byte corresponds to the control word of 4 bytes.