Is there any wire length limitation for the DS160PR412 since it's not seeing in layout guidance?
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There is no specific wire length limitation. Different traces and cables have different properties and insertion losses, so we cannot guarantee any length limitation. Please look at table 7-1 of the datasheet for approximate insertion losses the redriver can compensate for. The PCIe spec states that a system can function with up to 28dB of insertion loss at Gen4, so as long as the insertion loss of the complete signal path is less than 28dB + the compensation of the redriver, then the link should be stable. We recommend performing IBIS modelling to ensure this.