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Defining Capabilities, Restrictions, and Modes

This section presents some useful functions that will be explained more fully in later versions of this book.

A network driver overrides a number of IONetworkController functions in order to advertise its capabilities and restrictions. Some of these functions, and their uses, are:

• setMaxTransferUnit, which allows clients to set the largest single packet size to transfer.

• getPacketBufferConstraints, which informs the driver’s superclass of alignment constraints for packet buffers.

• getVendorString, which provides the vendor name for the hardware controller that the driver is operating.

• getModelString, which provides the model name for the hardware controller that the driver is operating.

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