Enum FlashAttnError 

pub enum FlashAttnError {
    Dispatch(DispatchError),
    Fa3RequiresHopper(SmArch),
    Fp8MustUseFp8Request,
    EmptyBatch,
    ZeroSeqlen,
    SeqlenOverflow,
    EmptyPagedCache,
    InvalidPagedBlockSize(u32),
    PagedHeadDimMismatch {
        cache: u32,
        req: u32,
    },
    ChunkIndexOutOfRange {
        index: u32,
        total: u32,
    },
    MockMode,
}

Errors surfaced by the FlashAttention crate. Most are construction- time validation failures; a small set are runtime launch errors produced by the actor (and kept here so callers can pattern-match without depending on the rest of atomr-accel-cuda).

Variants

Dispatch(DispatchError)

Validation against the dispatch table failed.

Fa3RequiresHopper(SmArch)

A FlashAttention v3 request targeted a non-Hopper arch.

Fp8MustUseFp8Request

An fp8 dtype was passed to a non-fp8 request type, or vice versa.

EmptyBatch

Variable-length / paged batch is empty.

ZeroSeqlen

Sequence length is zero.

SeqlenOverflow

Cumulative seqlens overflow batch_size * max_seqlen.

EmptyPagedCache

Paged KV cache is empty / zero-sized.

InvalidPagedBlockSize(u32)

Paged KV-cache block size not in the supported set.

PagedHeadDimMismatch

Paged cache head_dim doesn’t match the request head_dim.

Fields

cache: u32

req: u32

ChunkIndexOutOfRange

Chunked-prefill chunk index is out of range.

Fields

index: u32

total: u32

MockMode

Mock-mode actor saw a launch it can’t honour.

Trait Implementations

impl Clone for FlashAttnError

fn clone(&self) -> FlashAttnError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FlashAttnError

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

Formats the value using the given formatter.

impl Display for FlashAttnError

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

Formats the value using the given formatter.

impl Error for FlashAttnError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<DispatchError> for FlashAttnError

fn from(source: DispatchError) -> Self

Converts to this type from the input type.