Link width negotiation method, device and computer readable storage medium

Abstract

The present invention discloses a link width negotiation method, the method has following advantages: When a first PCIE device determines that a negotiation width received in a second negotiation state is different from a physical negotiation width determined in a first negotiation state, the first PCIE device does not directly report an failure to an operation and maintenance personnel, but firstly instructs the first PCIE device to switch to the first negotiating state, and instructs the second PCIE device to resend the negotiation width to the first PCIE device. When the failure is due to aprobabilistic data loss during a process where the second PCIE device sends the negotiation width to the first PCIE device, the negotiation width is resent to the first PCIE device by the second PCIEdevice, a high probability of data loss can be avoided during the resending process, so that the first PCIE device can implement self-repair of the failure, and dose not need the operation and maintenance personnel to perform manual failure detection, thereby improving working efficiency of the operation and maintenance personnel.

Description

technical field [0001] The present invention relates to the communication field, in particular to a link width negotiation method, device and computer-readable storage medium. Background technique [0002] Peripheral component interconnect express (PCIE) standard technology is widely used in PCIE devices such as personal computers, servers, and data centers. In the PCIE standard, various negotiation states are defined, such as a detect state and a polling state. [0003] The detection state refers to the initial state after the link is reset or powered on. In the detection state, the main PCIE device can detect whether there is a peer PCIE device through the charging test. When the peer device exists, the physical connection with the peer PCIE device Negotiate width. The polling state is the next state of the detection state. Starting from the polling state, the primary PCIE device will receive the negotiation width sent by the peer PCIE device, and perform link negotiatio...

AI Technical Summary

Problems solved by technology

[0004] However, due to probabilistic data loss when the peer PCIE device sends the negotiation width to the master PCIE device, the negotiation width received by the master PCIE device in the polling state is different from the physical negotiation width determined in the detection state. At this time, The main PCIE device will think that the peer PCIE device is untrustworthy and report an error to the operation and maintenance personnel. The operation and maintenance personnel need to manually detect the fault of the peer PCIE device, which reduces the work efficiency of the operation and maintenance personnel

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