Struct Capabilities 

#[non_exhaustive]
pub struct Capabilities {
    pub medium: Medium,
    pub max_transmission_unit: usize,
    pub checksum: ChecksumCapabilities,
    pub tx_headroom: usize,
}

A description of a device’s capabilities.

This is #[non_exhaustive] so that capabilities can be added later without breaking every driver. Drivers live outside this crate and so cannot use a struct expression, they start from Default and overwrite the fields they care about:

let mut caps = Capabilities::default();
caps.max_transmission_unit = 1514;
// caps.medium = Medium::Ethernet; is the default

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

medium: Medium

Medium of the device.

max_transmission_unit: usize

Maximum transmission unit.

The network device is unable to send or receive frames larger than the value returned by this function.

checksum: ChecksumCapabilities

Checksum offload.

Which checksums the device’s hardware verifies or computes, so the stack skips them in software.

tx_headroom: usize

Headroom the driver needs in front of each frame it transmits, in bytes.

For drivers that put a header of their own in front of the frame. Every buffer the stack hands to transmit has at least this much headroom.

Default: 0.

Trait Implementations

impl Clone for Capabilities

fn clone(&self) -> Capabilities

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Capabilities

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Capabilities

fn default() -> Self

Returns the “default value” for a type.