Hi vj,
Datasheet for FM10420 can be found at Intel® Ethernet Multi-host Controller FM 10000 Family: Datasheet
A linux version of the fm10k driver can be found on sourceforge at Intel Ethernet Drivers and Utilities - Browse /fm10k stable/0.19.3 at SourceForge.net , or 3'd party websites for newer version ( fm10k-0.20.1.tar.gz )
Regards,