The latest current-routing.txt doc can be found as:
Which routing engines are available will depend on OpenSM version used.
Are there specific engine(s) you are interested in ?
Specifically chain. Which should be older that Dec/17 and seems to be missing from all the docs I've seen. Mellanox has suggested we use this due to our layout, and I could not find a description.
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Chain routing is supported by MLNX OpenSM and not upstream OpenSM. There is doc/routing-chains.txt which is available with MOFED. REC (routing engine chains) also documented in the MLNX OFED User Manual.