Enum FlitTlpType 

#[non_exhaustive]
pub enum FlitTlpType {
    Nop,
    MemRead32,
    UioMemRead,
    MsgToRc,
    MemWrite32,
    IoWrite,
    CfgWrite0,
    FetchAdd32,
    CompareSwap32,
    DeferrableMemWrite32,
    UioMemWrite,
    MsgDToRc,
    LocalTlpPrefix,
}

TLP type codes used in Flit Mode DW0 byte 0.

These are completely different from the non-flit TlpType encoding. In flit mode, DW0[7:0] is a flat 8-bit type code rather than the non-flit Fmt[2:0] | Type[4:0] split.

#[non_exhaustive] — future type codes will be added without breaking downstream match arms.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Nop

NOP — smallest flit object, 1 DW base header, no payload.

MemRead32

32-bit Memory Read Request (3 DW base header, no payload despite Length field).

UioMemRead

UIO Memory Read — 64-bit address, 4 DW base header (PCIe 6.1+ UIO).

MsgToRc

Message routed to Root Complex, no data.

MemWrite32

32-bit Memory Write Request (3 DW base header + payload).

IoWrite

I/O Write Request — requires mandatory OHC-A2.

CfgWrite0

Type 0 Configuration Write Request — requires mandatory OHC-A3.

FetchAdd32

32-bit FetchAdd AtomicOp Request.

CompareSwap32

32-bit Compare-and-Swap AtomicOp Request (2 DW payload).

DeferrableMemWrite32

32-bit Deferrable Memory Write Request.

UioMemWrite

UIO Memory Write — 64-bit address, 4 DW base header (PCIe 6.1+ UIO).

MsgDToRc

Message with Data routed to Root Complex.

LocalTlpPrefix

Local TLP Prefix token (1 DW base header).

Implementations

impl FlitTlpType

pub fn base_header_dw(&self) -> u8

Base header size in DW, not counting OHC extension words.

• NOP and LocalTlpPrefix: 1 DW
• UIO types (64-bit address): 4 DW
• All other types: 3 DW

pub fn is_read_request(&self) -> bool

Returns true for read requests that carry no payload even when the Length field is non-zero.

pub fn has_data_payload(&self) -> bool

Returns true for TLP types that carry a data payload in the wire packet.

When false, total_bytes() ignores the Length field and contributes zero payload bytes regardless of its value. This covers:

• Read requests (payload is in the completion, not the request)
• NOP and Local TLP Prefix (management objects with no data)
• Message-without-data variants (MsgToRc)

Trait Implementations

impl Clone for FlitTlpType

fn clone(&self) -> FlitTlpType

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FlitTlpType

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

Formats the value using the given formatter.

impl Display for FlitTlpType

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

Formats the value using the given formatter.

impl PartialEq for FlitTlpType

fn eq(&self, other: &FlitTlpType) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl TryFrom<u8> for FlitTlpType

type Error = TlpError

The type returned in the event of a conversion error.

fn try_from(v: u8) -> Result<Self, Self::Error>

Performs the conversion.

impl Copy for FlitTlpType

impl StructuralPartialEq for FlitTlpType