Inheritance diagram for P4::EBPF::CRCChecksumAlgorithm:

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Public Member Functions
	CRCChecksumAlgorithm (const EBPFProgram *program, cstring name, int width)

void	emitAddData (CodeBuilder *builder, const ArgumentsList &arguments) override

void	emitClear (CodeBuilder *builder) override

void	emitGet (CodeBuilder *builder) override

void	emitGetInternalState (CodeBuilder *builder) override

void	emitSetInternalState (CodeBuilder builder, const IR::MethodCallExpression expr) override

void	emitSubtractData (CodeBuilder *builder, const ArgumentsList &arguments) override

void	emitVariables (CodeBuilder builder, const IR::Declaration_Instance decl) override
	decl might be a null pointer

unsigned	getOutputWidth () const override

Public Member Functions inherited from P4::EBPF::EBPFHashAlgorithmPSA
	EBPFHashAlgorithmPSA (const EBPFProgram *program, cstring name)

virtual void	emitAddData (CodeBuilder builder, int dataPos, const IR::MethodCallExpression expr)

virtual void	emitSubtractData (CodeBuilder builder, int dataPos, const IR::MethodCallExpression expr)

void	setVisitor (Visitor *instance)

Public Member Functions inherited from P4::EBPF::EBPFObject
	DECLARE_TYPEINFO (EBPFObject)

Public Member Functions inherited from P4::ICastable
template<typename T >
T &	as ()
	Tries to convert the class to type T. A BUG occurs if the cast fails.

template<typename T >
const T &	as () const
	Tries to convert the class to type T. A BUG occurs if the cast fails.

template<typename T >
T *	checkedTo ()
	Performs a checked cast. A BUG occurs if the cast fails.

template<typename T >
const T *	checkedTo () const
	Performs a checked cast. A BUG occurs if the cast fails.

Public Member Functions inherited from P4::RTTI::Base
template<typename T >
bool	is () const noexcept

virtual bool	isA (TypeId typeId) const noexcept=0

template<typename T >
const T *	to () const noexcept
	Same as `to`, but returns const pointer to T.

template<typename T >
T *	to () noexcept

virtual TypeId	typeId () const noexcept=0

Static Public Member Functions
static void	emitUpdateMethod (CodeBuilder *builder, int crcWidth)

Static Public Member Functions inherited from P4::EBPF::EBPFObject
static cstring	externalName (const IR::IDeclaration *declaration)

static cstring	getSpecializedTypeName (const IR::Declaration_Instance *di)

static cstring	getTypeName (const IR::Declaration_Instance *di)

Protected Attributes
const int	crcWidth

cstring	finalizeMethod

cstring	initialValue

cstring	polynomial

cstring	registerVar

cstring	updateMethod

Protected Attributes inherited from P4::EBPF::EBPFHashAlgorithmPSA
cstring	baseName

const EBPFProgram *	program

Visitor *	visitor

Additional Inherited Members
Public Types inherited from P4::EBPF::EBPFHashAlgorithmPSA
typedef std::vector< const IR::Expression * >	ArgumentsList

enum	HashAlgorithm { IDENTITY , CRC32 , CRC32_CUSTOM , CRC16 , CRC16_CUSTOM , ONES_COMPLEMENT16 , TARGET_DEFAULT }
	Keep this enum in sync with psa.p4 file.

Protected Member Functions inherited from P4::EBPF::EBPFHashAlgorithmPSA
ArgumentsList	unpackArguments (const IR::MethodCallExpression *expr, int dataPos)

Protected Member Functions inherited from P4::RTTI::Base
virtual const void *	toImpl (TypeId typeId) const noexcept=0

Member Function Documentation

◆ emitAddData()

void P4::EBPF::CRCChecksumAlgorithm::emitAddData	(	CodeBuilder *	builder,
		const ArgumentsList &	arguments )

overridevirtual

This method generates a C code that is responsible for updating a CRC check value from a given data.

From following P4 code: Checksum<bit<32>>(PSA_HashAlgorithm_t.CRC32) checksum; checksum.update(parsed_hdr.crc.f1); There will be generated a C code: crc32_update(&c_0_reg, (u8 *) &(parsed_hdr->crc.f1), 5, 0xEDB88320); Where: c_0_reg - a checksum internal state (CRC register) parsed_hdr->field1 - a data on which CRC is calculated 5 - a field size in bytes 0xEDB88320 - a polynomial in a reflected bit order.

Implements P4::EBPF::EBPFHashAlgorithmPSA.