wx_tx_desc
static void wx_tx_olinfo_status(union wx_tx_desc *tx_desc,
union wx_tx_desc *tx_desc;
union wx_tx_desc *eop_desc, *tx_desc;
tx_ring->size = tx_ring->count * sizeof(union wx_tx_desc);
union wx_tx_desc *tx_desc;
union wx_tx_desc *eop_desc = tx_buffer->next_to_watch;
(&(((union wx_tx_desc *)((R)->desc))[i]))
union wx_tx_desc *next_to_watch;