mcx_sq_entry
(sizeof(struct mcx_sq_entry) / sizeof(struct mcx_sq_entry_seg))
CTASSERT(sizeof(struct mcx_sq_entry) == 64);
npages = howmany((1 << MCX_LOG_SQ_SIZE) * sizeof(struct mcx_sq_entry),
struct mcx_sq_entry *sq, *sqe;
sq = (struct mcx_sq_entry *)MCX_DMA_KVA(&tx->tx_sq_mem);