I have just installed an Avago 9305-16i on the new OpenIndiana 2017.10
While the HBA worked I had problems with sas3ircu and slotdetection.
I updated the firmware to the newest P15 without success.
After some googling I found a solution, see
Bug #6784: sas3ircu doesn't detect LSI SAS 9300-16e - OpenIndiana Distribution - illumos.org
This solution also works with LSI9300 where a newer sas3ircu also has problems
While the HBA worked I had problems with sas3ircu and slotdetection.
I updated the firmware to the newest P15 without success.
After some googling I found a solution, see
Bug #6784: sas3ircu doesn't detect LSI SAS 9300-16e - OpenIndiana Distribution - illumos.org
This solution also works with LSI9300 where a newer sas3ircu also has problems