Methods, systems, and computer program products that, by defining a common interface, allow for a single implementation of operations common to both kernel mode and user mode processing, relative to a hardware adapter. Corresponding kernel mode and user mode implementations of the operations are provided. For a given process, a call to the common interface is mapped to the kernel mode implementation for kernel mode processes and to the user mode implementation for user mode processes. The mapping may be performed at runtime or may be static. The common operation may provide a user mode process direct access to a hardware adapter, such as for sending and receiving information, without switching to kernel mode. A kernel mode implementation for operations unique to kernel mode processing, such as specifying security parameters for the hardware adapter to enforce, or initiating and terminating communication through the hardware adapter, also may be provided.