Are you looking for the SERVER or the Client?
If you do not require the server software, have you tried these?
https://www.obdev.at/products/sharity/index.html
The server software came on a separate CD - and unfortunately I do not have the tarball of that or anything. SMB server on IRIX is very miserable - it's buggy, the OS hangs if there's any hard disconnects (i.e. if a client loses connection instead of logging off) and it's old, so you cannot connect to newer versions.
https://techpubs.jurassic.nl/manuals/065.../ch01.html
For more info on the implementation, start there.
For a better server alternative, use NFS - it works better with IRIX and can also be ran from a BSD, Solaris or other host.
I'm the system admin of this site. Private security technician, licensed locksmith, hack of a c developer and vintage computer enthusiast.
https://contrib.irixnet.org/raion/ -- contributions and pieces that I'm working on currently.
https://codeberg.org/SolusRaion -- Code repos I control
Technical problems should be sent my way.