bce_tx_buf
txr->tx_bufs = kmalloc(sizeof(struct bce_tx_buf) * TOTAL_TX_BD(txr),
struct bce_tx_buf *tx_buf = &txr->tx_bufs[i];
struct bce_tx_buf *tx_buf;
struct bce_tx_buf *tx_bufs; /* TOTAL_TX_BD */