MLY_MAX_CCBS
mly->mly_ncmds = uimin(MLY_MAX_CCBS, i);
rv = mly_dmamem_alloc(mly, MLY_SGL_SIZE * MLY_MAX_CCBS,
mly_dmamem_free(mly, MLY_SGL_SIZE * MLY_MAX_CCBS,
#define MLY_SLOT_MAX (MLY_SLOT_START + MLY_MAX_CCBS)