RxFD
dump_rxfd(struct RxFD *fd)
struct RxFD *next_rfd;
struct RxFD *rfd_base;
struct RxFD *rfd_limit;
struct RxFD *rfd_cur;
lp->rfd_base = (struct RxFD *)fd_addr;
fd_addr += sizeof(struct RxFD) * RX_FD_NUM;
lp->rfd_limit = (struct RxFD *)fd_addr - (RX_FD_RESERVE + 1);