DLC_DEL_FUNC_ADDR

The len_func_addr_mask (functional address mask length) field must be set to 4, and the func_addr_mask (functional address mask) field must have each bit that you wish to reset set to 1 within the functional address on the adapter.

Only bits 1 through 29 are valid. Bits 0, 30, and 31 are ignored. The most significant two bytes of the full six-byte functional address are automatically compared for 0xC000 by the adapter and cannot be deleted.