replace the mcopy when transmit packet from BSD to DPDK #364
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mmap a fixed number of pages for BSD stack, and mlock() fixed physical memory. Calculate each page's start address and save them. Init a stack structure to manage all allocted pages.
replace the ff_mmap()/ff_munmap() by get/free one page from pre_init stack structure.
when transmit bsd mbuf, using rte_mbuf's buf_addr/buf_physaddr to reference the real pkt, not using mcopy from mbuf to rte_mbuf.
using one circular queue saving sented mbuf's pointer, the queue should be same length with NIC's tx_queue_length. Before one item in queue pushed into new value, the old mbuf must be processed by NIC and can be freed safely.
if mbuf is ext_cluster type, which including one rte_mbuf, then using rte_pktmbuf_clone() instead.
all functions can be turned of by "USE_PAGE_ARRAY" in ./lib/Makefile