BXCAN_TX_MB_NUM
struct bxcan_mb tx_mb[BXCAN_TX_MB_NUM]; /* 0x180 - tx mailbox */
return priv->tx_head % BXCAN_TX_MB_NUM;
return priv->tx_tail % BXCAN_TX_MB_NUM;
return BXCAN_TX_MB_NUM - (priv->tx_head - priv->tx_tail);
ndev = alloc_candev(sizeof(struct bxcan_priv), BXCAN_TX_MB_NUM);