The LLC_BUFFER_FREE_PARMS structure is the DLC parameter table for the LLC_BUFFER_FREE command. You pass a pointer to this structure using the pParameterTable member of the CCB_PARMS union.
typedef struct {
USHORT usReserved1;
USHORT cBuffersLeft;
ULONG ulReserved;
PLLC_XMIT_BUFFER pFirstBuffer;
} LLC_BUFFER_FREE_PARMS, *PLLC_BUFFER_FREE_PARMS;
The buffers to be freed must have been obtained using the LLC_BUFFER_GET command.