CE_RING_IDX_INCR
#define CE_RING_IDX_INCR(nentries_mask, idx) (((idx) + 1) & (nentries_mask))
#define CE_RING_IDX_INCR(nentries_mask, idx) (((idx) + 1) & (nentries_mask))
#define CE_RING_IDX_INCR(nentries_mask, idx) (((idx) + 1) & (nentries_mask))