ET_DMA10_MASK
if ((tmp_free_buff_ring & ET_DMA10_MASK) > limit) {
tmp_free_buff_ring &= ~ET_DMA10_MASK;
tmp_free_buff_ring &= (ET_DMA10_MASK | ET_DMA10_WRAP);
tx_ring->send_idx &= ~ET_DMA10_MASK;
tcb->index_start &= ~ET_DMA10_MASK;
index > (tcb->index & ET_DMA10_MASK)) {
#define INDEX10(x) ((x) & ET_DMA10_MASK)