example fastpath initialization psudo code

1. example fastpath initialization psudo code // first get list of interfaces then allocate memory to hold meta-interface state ifcnt = get_interfaces(iflist); struct mientry_t {int ifn; uint32_t ipaddr; uint16_t port, uint32_t bw;} micnt = 2 * ifcnt; milist = mkmilist(ifcnt*2); // Estimate the computational complexity and memory bandwidth requirements on NPE. npeComp = {‘firm’, my_estimated_BW, my_estimated_PPS}; // max general NPE resource counts {fltr_count, queue_count, buffer_count, stats_count} npeCounts = {my_fcnt*micnt, my_qcnt*micnt, my_bcnt*micnt, my_scnt*micnt}; // Request substrate to allocate a fastpath instance for the IPv4 code option alloc_fast_path(‘IPv4’, npeComp, npeCounts, sramSize, dramSize); // allocate two meta-interfaces for each external interface for (indx = 0, mi = 0; indx < ifcnt; ++indx) { // allocate bandwidth for all meta-interfaces on this interface my_ifBW = my_calcbw(iflist[indx].availBW); alloc_ifbw(iflist[indx].ifn, my_ifBW); do { // allocate and initialize 2 meta-interfaces for interface ifn milist[mi] = my_alloc_mi(iflist+indx, my_ifBW/2); // associated queues with MIs and initialize parameters my_simple_qinit(mi, my_qcnt); // install entries for local delivery and default routes add_default_routes(milist+mi); } while (++mi & 1); }

2. example fastpath initialization psudo code milist_t *my_alloc_mi(ifentry_t *ifentry, int bw) { milist_t *milist = (milist_t *)calloc(1, sizeof(milist_t)); milist->ifn = ifentry->ifn; milist->ipaddr = ifentry->ipadd; milist->port = alloc_port(ifentry->ipaddr, 0, ‘UDP’); milist->bw = bw; add_udp_endpoint(milist->ipaddr,milist->port, milist->bw); } int my_simple_qinit(int mi, int qcnt) { bind_queue(mi, ‘range’, {mi * qcnt, (mi+1)*qcnt}); for (int qid = 0; qid < my_qcnt; ++qid) set_queue_params(qid, default_threshold, milist[mi].bw/my_qcnt); } add_default_routes(mientry_t *mientry) { static fid = 0; nhoplist_t *nhop; nhop = get_default_route(miptr); write_fltr(fid++, miptr->mi, nhop[0].prefix, nhop[0].action, nhop[0].attrs}); write_fltr(fid++, miptr->mi, nhop[1].prefix, nhop[1].action, nhop[1].attrs); }