rxdma_mailbox
struct rxdma_mailbox *mbox = rp->mbox;
struct rxdma_mailbox *mbox = rp->mbox;
sizeof(struct rxdma_mailbox),
BUILD_BUG_ON(sizeof(struct rxdma_mailbox) != 64);
sizeof(struct rxdma_mailbox),
struct rxdma_mailbox *mbox;