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/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2020 Mellanox Technologies, Ltd
 */

#include <rte_log.h>
#include <rte_errno.h>
#include <rte_malloc.h>
#include <rte_regexdev.h>
#include <rte_regexdev_core.h>
#include <rte_regexdev_driver.h>
#include <sys/mman.h>

#include <mlx5_glue.h>
#include <mlx5_devx_cmds.h>
#include <mlx5_prm.h>
#include <mlx5_common_os.h>

#include "mlx5_regex.h"
#include "mlx5_regex_utils.h"
#include "mlx5_rxp.h"

#define MLX5_REGEX_MAX_MATCHES MLX5_RXP_MAX_MATCHES
#define MLX5_REGEX_MAX_PAYLOAD_SIZE MLX5_RXP_MAX_JOB_LENGTH
#define MLX5_REGEX_MAX_RULES_PER_GROUP UINT32_MAX
#define MLX5_REGEX_MAX_GROUPS MLX5_RXP_MAX_SUBSETS

#define MLX5_REGEX_RXP_ROF2_LINE_LEN 34

/* Private Declarations */
static int
rxp_create_mkey(struct mlx5_regex_priv *priv, void *ptr, size_t size,
	uint32_t access, struct mlx5_regex_mkey *mkey);
static inline void
rxp_destroy_mkey(struct mlx5_regex_mkey *mkey);

int
mlx5_regex_info_get(struct rte_regexdev *dev __rte_unused,
		    struct rte_regexdev_info *info)
{
	info->max_matches = MLX5_REGEX_MAX_MATCHES;
	info->max_payload_size = MLX5_REGEX_MAX_PAYLOAD_SIZE;
	info->max_rules_per_group = MLX5_REGEX_MAX_RULES_PER_GROUP;
	info->max_groups = MLX5_REGEX_MAX_GROUPS;
	info->regexdev_capa = RTE_REGEXDEV_SUPP_PCRE_GREEDY_F |
			      RTE_REGEXDEV_CAPA_QUEUE_PAIR_OOS_F;
	info->rule_flags = 0;
	info->max_queue_pairs = UINT16_MAX;
	return 0;
}

static int
rxp_create_mkey(struct mlx5_regex_priv *priv, void *ptr, size_t size,
	uint32_t access, struct mlx5_regex_mkey *mkey)
{
	struct mlx5_devx_mkey_attr mkey_attr;

	/* Register the memory. */
	mkey->umem = mlx5_glue->devx_umem_reg(priv->cdev->ctx, ptr, size, access);
	if (!mkey->umem) {
		DRV_LOG(ERR, "Failed to register memory!");
		return -ENODEV;
	}
	/* Create mkey */
	mkey_attr = (struct mlx5_devx_mkey_attr) {
		.addr = (uintptr_t)ptr,
		.size = (uint32_t)size,
		.umem_id = mlx5_os_get_umem_id(mkey->umem),
		.pg_access = 1,
		.umr_en = 0,
	};
#ifdef HAVE_IBV_FLOW_DV_SUPPORT
	mkey_attr.pd = priv->cdev->pdn;
#endif
	mkey->mkey = mlx5_devx_cmd_mkey_create(priv->cdev->ctx, &mkey_attr);
	if (!mkey->mkey) {
		DRV_LOG(ERR, "Failed to create direct mkey!");
		return -ENODEV;
	}
	return 0;
}

static inline void
rxp_destroy_mkey(struct mlx5_regex_mkey *mkey)
{
	if (mkey->mkey)
		claim_zero(mlx5_devx_cmd_destroy(mkey->mkey));
	if (mkey->umem)
		claim_zero(mlx5_glue->devx_umem_dereg(mkey->umem));
}

int
mlx5_regex_rules_db_import(struct rte_regexdev *dev,
		     const char *rule_db, uint32_t rule_db_len)
{
	struct mlx5_regex_priv *priv = dev->data->dev_private;
	struct mlx5_regex_mkey mkey;
	uint32_t id;
	int ret;
	void *ptr;

	if (priv->prog_mode == MLX5_RXP_MODE_NOT_DEFINED) {
		DRV_LOG(ERR, "RXP programming mode not set!");
		return -1;
	}
	if (rule_db == NULL) {
		DRV_LOG(ERR, "Database empty!");
		return -ENODEV;
	}
	if (rule_db_len == 0)
		return -EINVAL;
	/* copy rules - rules have to be 4KB aligned. */
	ptr = rte_malloc("", rule_db_len, 1 << 12);
	if (!ptr) {
		DRV_LOG(ERR, "Failed to allocate rules file memory.");
		return -ENOMEM;
	}
	rte_memcpy(ptr, rule_db, rule_db_len);
	/* Register umem and create rof mkey. */
	ret = rxp_create_mkey(priv, ptr, rule_db_len, /*access=*/7, &mkey);
	if (ret < 0)
		return ret;

	for (id = 0; id < priv->nb_engines; id++) {
		ret = mlx5_devx_regex_rules_program(priv->cdev->ctx, id,
			mkey.mkey->id, rule_db_len, (uintptr_t)ptr);
		if (ret < 0) {
			DRV_LOG(ERR, "Failed to program rxp rules.");
			ret = -ENODEV;
			break;
		}
		ret = 0;
	}
	rxp_destroy_mkey(&mkey);
	rte_free(ptr);
	return ret;
}

int
mlx5_regex_configure(struct rte_regexdev *dev,
		     const struct rte_regexdev_config *cfg)
{
	struct mlx5_regex_priv *priv = dev->data->dev_private;
	int ret;

	if (priv->prog_mode == MLX5_RXP_MODE_NOT_DEFINED)
		return -1;
	priv->nb_queues = cfg->nb_queue_pairs;
	dev->data->dev_conf.nb_queue_pairs = priv->nb_queues;
	priv->qps = rte_zmalloc(NULL, sizeof(struct mlx5_regex_qp) *
				priv->nb_queues, 0);
	if (!priv->nb_queues) {
		DRV_LOG(ERR, "can't allocate qps memory");
		rte_errno = ENOMEM;
		return -rte_errno;
	}
	priv->nb_max_matches = cfg->nb_max_matches;
	if (cfg->rule_db != NULL) {
		ret = mlx5_regex_rules_db_import(dev, cfg->rule_db,
						 cfg->rule_db_len);
		if (ret < 0) {
			DRV_LOG(ERR, "Failed to program rxp rules.");
			rte_errno = ENODEV;
			goto configure_error;
		}
	} else
		DRV_LOG(DEBUG, "Regex config without rules programming!");
	return 0;
configure_error:
	if (priv->qps)
		rte_free(priv->qps);
	return -rte_errno;
}