1. A method comprising: defining, by a network Input/Output (I/O) device of a network security device, a direct cache access (DCA) control for an I/O device queue that corresponds to a central processing unit (CPU) of a host processor of the network security device based on a type of network security functionality performed by the CPU, wherein the DCA control indicates a part of an incoming packet that is to be copied to a cache of the CPU to facilitate efficient performance of the network security functionality by the CPU; parsing, by the network I/O device, the incoming packet based on one or more of packet analysis, packet protocol, header format, and payload data information; transferring, from the I/O device queue, the parsed incoming packet to a host queue of a host memory of the network security device, wherein the host memory is operatively coupled with the host processor; and copying, by a host controller, only the part of the parsed incoming packet to the cache of the CPU based on the DCA control.