NM_BDG_BATCH_MAX
dst_ents = (struct nm_bdg_q *)(ft + NM_BDG_BATCH_MAX);
#define NM_FT_NULL NM_BDG_BATCH_MAX
l = sizeof(struct nm_bdg_fwd) * NM_BDG_BATCH_MAX;
l += sizeof(uint16_t) * NM_BDG_BATCH_MAX;
dstq = (struct nm_bdg_q *)(ft + NM_BDG_BATCH_MAX);