HashExpr Class Reference

#include <hashexpr.h>

Inheritance diagram for HashExpr:

Classes
class	Crc
class	Mask
class	PhvRef
class	Random
class	SExtend
class	Slice
class	Stripe
class	Xor
class	XorHash
	XOR hashing algorithm implemented on the hashing matrix. More...

Public Member Functions
virtual void	build_algorithm ()=0
virtual bool	check_ixbar (InputXbar *ix, InputXbar::HashTable ht)=0
virtual void	dbprint (std::ostream &out) const
void	find_input (Phv::Ref what, std::vector< ixbar_input_t > &inputs, InputXbar *ix, InputXbar::HashTable hash_table)
virtual void	gen_data (bitvec &data, int bit, InputXbar *ix, InputXbar::HashTable hash_table)
void	gen_ixbar_init (ixbar_init_t *ixbar_init, std::vector< ixbar_input_t > &inputs, std::vector< hash_matrix_output_t > &outputs, int logical_hash_bit, InputXbar *ix, InputXbar::HashTable hash_table)
virtual void	gen_ixbar_inputs (std::vector< ixbar_input_t > &inputs, InputXbar *ix, InputXbar::HashTable hash_table)=0
virtual Phv::Ref *	get_ghost_slice ()
std::vector< Phv::Ref >	get_sources (int bit) const
virtual void	get_sources (int bit, std::vector< Phv::Ref > &) const =0
virtual int	input_size ()=0
virtual bool	match_phvref (const Phv::Ref &ref)
bool	operator!= (const HashExpr &a) const
virtual bool	operator== (const HashExpr &) const =0
virtual int	width ()=0
Public Member Functions inherited from P4::IHasDbPrint
void	print () const

Static Public Member Functions
static HashExpr *	create (gress_t, int stage, const value_t &)

Public Attributes
bfn_hash_algorithm_t	hash_algorithm = {}
int	lineno

Protected Member Functions
	HashExpr (int l)

Detailed Description

Copyright (C) 2024 Intel Corporation

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

SPDX-License-Identifier: Apache-2.0

Member Function Documentation

dbprint()

virtual void HashExpr::dbprint ( std::ostream & out ) const

inlinevirtual

Implements P4::IHasDbPrint.

gen_data()

void HashExpr::gen_data ( bitvec & data, int logical_hash_bit, InputXbar * ix, InputXbar::HashTable hash_table )

virtual

The function call for PhvRef, Random, Identity, and Crc functions. The input xbar is initialized, and the data returned writes out a vector of inputs. For Stripe, Slice, and others, they recursively will call this function

gen_ixbar_init()

void HashExpr::gen_ixbar_init	(	ixbar_init_t *	ixbar_init,
		std::vector< ixbar_input_t > &	inputs,
		std::vector< hash_matrix_output_t > &	outputs,
		int	logical_hash_bit,
		InputXbar *	ix,
		InputXbar::HashTable	hash_table )

Generating a list of ixbar_input_t and hash_matrix_output_t to be sent to the dynamic_hash library. The vectors are part of the function call as they must be on the stack to avoid using new and delete