Struct ScsiDataOutBuilder 

pub struct ScsiDataOutBuilder {
    pub header: ScsiDataOut,
    /* private fields */
}

Builder for SCSI Data-Out PDUs (opcode 0x26).

This helper prepares the Basic Header Segment (BHS) for Data-Out and lets the higher layer stream an arbitrary payload split into chunks that respect the negotiated MaxRecvDataSegmentLength (MRDSL).

When the payload is later converted into wire frames (by your ToBytes/Builder implementation), each chunk will be emitted as a separate Data-Out PDU with:

• F (Final) = 1 only on the last chunk,
• DataSN increasing sequentially per PDU,
• BufferOffset set to the cumulative number of bytes already sent,
• DataSegmentLength equal to the current chunk size (without padding).

Target Transfer Tag (TTT) semantics:

• For unsolicited / initial burst Data-Out PDUs, use DEFAULT_TTT = 0xFFFF_FFFF.
• For R2T-driven transfers, set the TTT received in the R2T PDU.

You can also request HeaderDigest and/or DataDigest emission; these flags only affect how the final frames are serialized (they do not modify the BHS fields directly).

Fields

header: ScsiDataOut

Implementations

impl ScsiDataOutBuilder

pub const DEFAULT_TTT: u32 = 0xFFFF_FFFF

The default Target Transfer Tag for unsolicited Data-Out PDUs.

pub fn new() -> Self

Creates a new ScsiDataOutBuilder with default values.

pub fn lun(self, lun: u64) -> Self

Sets the Logical Unit Number (LUN) for the data transfer.

pub fn initiator_task_tag(self, itt: u32) -> Self

Sets the Initiator Task Tag (ITT) for the command.

pub fn target_transfer_tag(self, ttt: u32) -> Self

Sets the Target Transfer Tag (TTT) for the data transfer.

pub fn exp_stat_sn(self, sn: u32) -> Self

Sets the expected status sequence number (ExpStatSN).

pub fn data_sn(self, data_sn: u32) -> Self

Sets the Data Sequence Number (DataSN) for this PDU.

pub fn buffer_offset(self, buffer_offset: u32) -> Self

Sets the buffer offset for this PDU.

pub fn with_header_digest(self) -> Self

Enables header digest for the PDU.

pub fn with_data_digest(self) -> Self

Enables data digest for the PDU.

Trait Implementations

impl Debug for ScsiDataOutBuilder

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

Formats the value using the given formatter.

impl Default for ScsiDataOutBuilder

fn default() -> ScsiDataOutBuilder

Returns the “default value” for a type.