does qlnxe 100G support DAC splitter?

[Ronald Khoo]

hi freebsd-net,

two questions:

a. does the qlnxe driver support treating one 100G port as four separate
25G ethernet interfaces via a QSFP28 to 4 x SP25 DAC splitter cable?

b. and does it work for one of those to be plugged into a 10G SFP+ switch?

trying to figure out an upgrade path from 10G to 25G to 100G  on a slot
constrained server -- a recent TYAN which only has one proprietary slot for
a high speed NIC and I'd like to be able to connect to both a current 10G
switch as well as a 100G switch in future (at 25 while migrating and then
at 100 once done).

the alternative would be to buy a dual 10G NIC initially and then throw it
away when going to 100G -- I'm wondering if I can avoid that.

thanks!
ronald