DESC_SZ
memset(dring->vaddr, 0, DESC_SZ * DESC_NUM);
dma_free_coherent(priv->dev, DESC_SZ * DESC_NUM,
dring->vaddr = dma_alloc_coherent(priv->dev, DESC_SZ * DESC_NUM,
de = dring->vaddr + (DESC_SZ * i);
struct netsec_de *de = dring->vaddr + DESC_SZ * idx;
entry = dring->vaddr + DESC_SZ * tail;
entry = dring->vaddr + DESC_SZ * tail;
de = dring->vaddr + (DESC_SZ * idx);
struct netsec_de *de = dring->vaddr + (DESC_SZ * idx);