Struct virtio_device::fake_queue::Chain

pub struct Chain { /* private fields */ }

Descriptor chain that can be published in a FakeQueue

Implementations

impl Chain

pub fn with_lengths( readable: &[u32], writable: &[u32], mem: &IdentityDriverMem ) -> Self

Build a descriptor chain with zeroed readable and writable descriptors.

For every value in the readable and writable slice provided, allocates a descriptor of that many bytes in the descriptor chain.

pub fn with_data<T: Copy>( readable: &[&[T]], writable: &[u32], mem: &IdentityDriverMem ) -> Self

Build a descriptor chain providing data for readable descriptors.

Similar to with_lengths except the readable descriptors are populated with a copy of the provided data slice instead.

pub fn with_exact_data(chain: &[(DescAccess, u64, u32)]) -> Self

Build a descriptor chain with raw data references.

Does not allocate data for any descriptors, instead puts the provided address and length directly into the final descriptor. This is intentionally designed to allow to you to build corrupt and invalid descriptor chains for the purposes of testing.