Method and device for realizing flow control in Ethernet chip

Abstract

The present invention discloses a method and a device for realizing flow control in an Ethernet chip. When a message enters the output queue of the output port of an Ethernet switch, the current flow is read by the queue length reading module set in the output queue resource policy module. The queue length of the outgoing port, compare the queue length with the preset queue length threshold for sending Pause frames, read and set the Pause trigger state table of all incoming ports corresponding to the outgoing port according to the comparison result; trigger according to the Pause The Pause state of the ingress port that is set in the device state table carries out the update of corresponding ingress port Pause state counting information, and determines whether described ingress port sends Pause frame according to the updating result of described ingress port Pause counting information, makes the sending of Pause frame complete Depending on the queue length of the egress port, network traffic can be more precisely controlled.

Description

technical field [0001] The invention relates to the field of network communication, in particular to a method and a device for controlling flow in an Ethernet chip by setting a check mode for message entering and exiting a port and exiting a queue. Background technique [0002] The management of network resources of an Ethernet switch chip is generally divided into ingress port resource management and egress port resource management. After the packet enters from the ingress port of the switch, the process of forwarding to the egress port needs to be realized through port resource management. Ingress port resource management is based on the ingress port of the packet, and the egress port resource management is based on the egress port of the packet, such as figure 1 In the shown switch, it has two ingress ports, namely ingress port X, ingress port Y, and an egress port Z, different messages are sent from ingress port X, ingress port Y to egress port Z, and Port Z is forwarde...

AI Technical Summary

Problems solved by technology

The length of the X queue at the ingress port determines whether to send a Pause frame. However, the maximum length of the X queue at the ingress port = the maximum length of the outbound queue at the Z outbound port - the length of the Y queue at the ingress port. If the number of ingress ports increases, the Pause frame is sent The length of the inbound queue will have great uncertainty, that is, it may be because the outbound queue of the outbound port reaches the maximum length, but the inbound queue cannot reach the threshold of sending Pause, and the flow control (Flow Control) cannot be implemented according to the network congestion. Expectations require work

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