/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#ifndef	_ACL_H_
#define	_ACL_H_

#ifdef __cplusplus
extern"C" {
#endif /* __cplusplus */

#define RTE_ACL_QUAD_MAX	5
#define RTE_ACL_QUAD_SIZE	4
#define RTE_ACL_QUAD_SINGLE	UINT64_C(0x7f7f7f7f00000000)

#define RTE_ACL_SINGLE_TRIE_SIZE	2000

#define RTE_ACL_DFA_MAX		UINT8_MAX
#define RTE_ACL_DFA_SIZE	(UINT8_MAX + 1)

#define	RTE_ACL_DFA_GR64_SIZE	64
#define	RTE_ACL_DFA_GR64_NUM	(RTE_ACL_DFA_SIZE / RTE_ACL_DFA_GR64_SIZE)
#define	RTE_ACL_DFA_GR64_BIT	\
	(CHAR_BIT * sizeof(uint32_t) / RTE_ACL_DFA_GR64_NUM)

typedef int bits_t;

#define	RTE_ACL_BIT_SET_SIZE	((UINT8_MAX + 1) / (sizeof(bits_t) * CHAR_BIT))

struct rte_acl_bitset {
	bits_t             bits[RTE_ACL_BIT_SET_SIZE];
};

#define	RTE_ACL_NODE_DFA	(0 << RTE_ACL_TYPE_SHIFT)
#define	RTE_ACL_NODE_SINGLE	(1U << RTE_ACL_TYPE_SHIFT)
#define	RTE_ACL_NODE_QRANGE	(3U << RTE_ACL_TYPE_SHIFT)
#define	RTE_ACL_NODE_MATCH	(4U << RTE_ACL_TYPE_SHIFT)
#define	RTE_ACL_NODE_TYPE	(7U << RTE_ACL_TYPE_SHIFT)
#define	RTE_ACL_NODE_UNDEFINED	UINT32_MAX

/*
 * ACL RT structure is a set of multibit tries (with stride == 8)
 * represented by an array of transitions. The next position is calculated
 * based on the current position and the input byte.
 * Each transition is 64 bit value with the following format:
 * | node_type_specific : 32 | node_type : 3 | node_addr : 29 |
 * For all node types except RTE_ACL_NODE_MATCH, node_addr is an index
 * to the start of the node in the transtions array.
 * Few different node types are used:
 * RTE_ACL_NODE_MATCH:
 * node_addr value is and index into an array that contains the return value
 * and its priority for each category.
 * Upper 32 bits of the transition value are not used for that node type.
 * RTE_ACL_NODE_QRANGE:
 * that node consist of up to 5 transitions.
 * Upper 32 bits are interpreted as 4 signed character values which
 * are ordered from smallest(INT8_MIN) to largest (INT8_MAX).
 * These values define 5 ranges:
 * INT8_MIN <= range[0]  <= ((int8_t *)&transition)[4]
 * ((int8_t *)&transition)[4] < range[1] <= ((int8_t *)&transition)[5]
 * ((int8_t *)&transition)[5] < range[2] <= ((int8_t *)&transition)[6]
 * ((int8_t *)&transition)[6] < range[3] <= ((int8_t *)&transition)[7]
 * ((int8_t *)&transition)[7] < range[4] <= INT8_MAX
 * So for input byte value within range[i] i-th transition within that node
 * will be used.
 * RTE_ACL_NODE_SINGLE:
 * always transitions to the same node regardless of the input value.
 * RTE_ACL_NODE_DFA:
 * that node consits of up to 256 transitions.
 * In attempt to conserve space all transitions are divided into 4 consecutive
 * groups, by 64 transitions per group:
 * group64[i] contains transitions[i * 64, .. i * 64 + 63].
 * Upper 32 bits are interpreted as 4 unsigned character values one per group,
 * which contain index to the start of the given group within the node.
 * So to calculate transition index within the node for given input byte value:
 * input_byte - ((uint8_t *)&transition)[4 + input_byte / 64].
 */

/*
 * Structure of a node is a set of ptrs and each ptr has a bit map
 * of values associated with this transition.
 */
struct rte_acl_ptr_set {
	struct rte_acl_bitset values;	/* input values associated with ptr */
	struct rte_acl_node  *ptr;	/* transition to next node */
};

struct rte_acl_classifier_results {
	int results[RTE_ACL_MAX_CATEGORIES];
};

struct rte_acl_match_results {
	uint32_t results[RTE_ACL_MAX_CATEGORIES];
	int32_t priority[RTE_ACL_MAX_CATEGORIES];
};

struct rte_acl_node {
	uint64_t node_index;  /* index for this node */
	uint32_t level;       /* level 0-n in the trie */
	uint32_t ref_count;   /* ref count for this node */
	struct rte_acl_bitset  values;
	/* set of all values that map to another node
	 * (union of bits in each transition.
	 */
	uint32_t                num_ptrs; /* number of ptr_set in use */
	uint32_t                max_ptrs; /* number of allocated ptr_set */
	uint32_t                min_add;  /* number of ptr_set per allocation */
	struct rte_acl_ptr_set *ptrs;     /* transitions array for this node */
	int32_t                 match_flag;
	int32_t                 match_index; /* index to match data */
	uint32_t                node_type;
	int32_t                 fanout;
	/* number of ranges (transitions w/ consecutive bits) */
	int32_t                 id;
	struct rte_acl_match_results *mrt; /* only valid when match_flag != 0 */
	union {
		char            transitions[RTE_ACL_QUAD_SIZE];
		/* boundaries for ranged node */
		uint8_t         dfa_gr64[RTE_ACL_DFA_GR64_NUM];
	};
	struct rte_acl_node     *next;
	/* free list link or pointer to duplicate node during merge */
	struct rte_acl_node     *prev;
	/* points to node from which this node was duplicated */
};

/*
 * Types of tries used to generate runtime structure(s)
 */
enum {
	RTE_ACL_FULL_TRIE = 0,
	RTE_ACL_NOSRC_TRIE = 1,
	RTE_ACL_NODST_TRIE = 2,
	RTE_ACL_NOPORTS_TRIE = 4,
	RTE_ACL_NOVLAN_TRIE = 8,
	RTE_ACL_UNUSED_TRIE = 0x80000000
};


/** MAX number of tries per one ACL context.*/
#define RTE_ACL_MAX_TRIES	8

/** Max number of characters in PM name.*/
#define RTE_ACL_NAMESIZE	32


struct rte_acl_trie {
	uint32_t        type;
	uint32_t        count;
	uint32_t        root_index;
	const uint32_t *data_index;
	uint32_t        num_data_indexes;
};

struct rte_acl_bld_trie {
	struct rte_acl_node *trie;
};

struct rte_acl_ctx {
	char                name[RTE_ACL_NAMESIZE];
	/** Name of the ACL context. */
	int32_t             socket_id;
	/** Socket ID to allocate memory from. */
	enum rte_acl_classify_alg alg;
	void               *rules;
	uint32_t            max_rules;
	uint32_t            rule_sz;
	uint32_t            num_rules;
	uint32_t            num_categories;
	uint32_t            num_tries;
	uint32_t            match_index;
	uint64_t            no_match;
	uint64_t            idle;
	uint64_t           *trans_table;
	uint32_t           *data_indexes;
	struct rte_acl_trie trie[RTE_ACL_MAX_TRIES];
	void               *mem;
	size_t              mem_sz;
	struct rte_acl_config config; /* copy of build config. */
};

int rte_acl_gen(struct rte_acl_ctx *ctx, struct rte_acl_trie *trie,
	struct rte_acl_bld_trie *node_bld_trie, uint32_t num_tries,
	uint32_t num_categories, uint32_t data_index_sz, size_t max_size);

typedef int (*rte_acl_classify_t)
(const struct rte_acl_ctx *, const uint8_t **, uint32_t *, uint32_t, uint32_t);

/*
 * Different implementations of ACL classify.
 */
int
rte_acl_classify_scalar(const struct rte_acl_ctx *ctx, const uint8_t **data,
	uint32_t *results, uint32_t num, uint32_t categories);

int
rte_acl_classify_sse(const struct rte_acl_ctx *ctx, const uint8_t **data,
	uint32_t *results, uint32_t num, uint32_t categories);

int
rte_acl_classify_avx2(const struct rte_acl_ctx *ctx, const uint8_t **data,
	uint32_t *results, uint32_t num, uint32_t categories);

int
rte_acl_classify_neon(const struct rte_acl_ctx *ctx, const uint8_t **data,
	uint32_t *results, uint32_t num, uint32_t categories);

int
rte_acl_classify_altivec(const struct rte_acl_ctx *ctx, const uint8_t **data,
	uint32_t *results, uint32_t num, uint32_t categories);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* _ACL_H_ */
