MAX_BLOCK_SIZE
u8 key[MAX_BLOCK_SIZE];
u8 param[MAX_DIGEST_SIZE + MAX_IMBL_SIZE + MAX_BLOCK_SIZE];
u8 buf[MAX_BLOCK_SIZE];
bz = MAX_BLOCK_SIZE;
bz = max(min(bz, MAX_BLOCK_SIZE), MIN_MEMORY_BLOCK_SIZE);
dma_set_max_seg_size(&pdev->dev, MAX_BLOCK_SIZE);