/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright (c) 2015-2020 Amazon.com, Inc. or its affiliates.
 * All rights reserved.
 */

#ifndef _ENA_ETHDEV_H_
#define _ENA_ETHDEV_H_

#include <rte_cycles.h>
#include <rte_pci.h>
#include <rte_bus_pci.h>
#include <rte_timer.h>

#include "ena_com.h"

#define ENA_REGS_BAR	0
#define ENA_MEM_BAR	2

#define ENA_MAX_NUM_QUEUES	128
#define ENA_MIN_FRAME_LEN	64
#define ENA_NAME_MAX_LEN	20
#define ENA_PKT_MAX_BUFS	17
#define ENA_RX_BUF_MIN_SIZE	1400
#define ENA_DEFAULT_RING_SIZE	1024

#define ENA_MIN_MTU		128

#define ENA_MMIO_DISABLE_REG_READ	BIT(0)

#define ENA_WD_TIMEOUT_SEC	3
#define ENA_DEVICE_KALIVE_TIMEOUT (ENA_WD_TIMEOUT_SEC * rte_get_timer_hz())

/* While processing submitted and completed descriptors (rx and tx path
 * respectively) in a loop it is desired to:
 *  - perform batch submissions while populating sumbissmion queue
 *  - avoid blocking transmission of other packets during cleanup phase
 * Hence the utilization ratio of 1/8 of a queue size or max value if the size
 * of the ring is very big - like 8k Rx rings.
 */
#define ENA_REFILL_THRESH_DIVIDER      8
#define ENA_REFILL_THRESH_PACKET       256

#define ENA_IDX_NEXT_MASKED(idx, mask) (((idx) + 1) & (mask))
#define ENA_IDX_ADD_MASKED(idx, n, mask) (((idx) + (n)) & (mask))

struct ena_adapter;

enum ena_ring_type {
	ENA_RING_TYPE_RX = 1,
	ENA_RING_TYPE_TX = 2,
};

struct ena_tx_buffer {
	struct rte_mbuf *mbuf;
	unsigned int tx_descs;
	unsigned int num_of_bufs;
	struct ena_com_buf bufs[ENA_PKT_MAX_BUFS];
};

/* Rx buffer holds only pointer to the mbuf - may be expanded in the future */
struct ena_rx_buffer {
	struct rte_mbuf *mbuf;
	struct ena_com_buf ena_buf;
};

struct ena_calc_queue_size_ctx {
	struct ena_com_dev_get_features_ctx *get_feat_ctx;
	struct ena_com_dev *ena_dev;
	u32 max_rx_queue_size;
	u32 max_tx_queue_size;
	u16 max_tx_sgl_size;
	u16 max_rx_sgl_size;
};

struct ena_stats_tx {
	u64 cnt;
	u64 bytes;
	u64 prepare_ctx_err;
	u64 linearize;
	u64 linearize_failed;
	u64 tx_poll;
	u64 doorbells;
	u64 bad_req_id;
	u64 available_desc;
};

struct ena_stats_rx {
	u64 cnt;
	u64 bytes;
	u64 refill_partial;
	u64 bad_csum;
	u64 mbuf_alloc_fail;
	u64 bad_desc_num;
	u64 bad_req_id;
};

struct ena_ring {
	u16 next_to_use;
	u16 next_to_clean;

	enum ena_ring_type type;
	enum ena_admin_placement_policy_type tx_mem_queue_type;
	/* Holds the empty requests for TX/RX OOO completions */
	union {
		uint16_t *empty_tx_reqs;
		uint16_t *empty_rx_reqs;
	};

	union {
		struct ena_tx_buffer *tx_buffer_info; /* contex of tx packet */
		struct ena_rx_buffer *rx_buffer_info; /* contex of rx packet */
	};
	struct rte_mbuf **rx_refill_buffer;
	unsigned int ring_size; /* number of tx/rx_buffer_info's entries */
	unsigned int size_mask;

	struct ena_com_io_cq *ena_com_io_cq;
	struct ena_com_io_sq *ena_com_io_sq;

	struct ena_com_rx_buf_info ena_bufs[ENA_PKT_MAX_BUFS]
						__rte_cache_aligned;

	struct rte_mempool *mb_pool;
	unsigned int port_id;
	unsigned int id;
	/* Max length PMD can push to device for LLQ */
	uint8_t tx_max_header_size;
	int configured;

	uint8_t *push_buf_intermediate_buf;

	struct ena_adapter *adapter;
	uint64_t offloads;
	u16 sgl_size;

	bool disable_meta_caching;

	union {
		struct ena_stats_rx rx_stats;
		struct ena_stats_tx tx_stats;
	};

	unsigned int numa_socket_id;
} __rte_cache_aligned;

enum ena_adapter_state {
	ENA_ADAPTER_STATE_FREE    = 0,
	ENA_ADAPTER_STATE_INIT    = 1,
	ENA_ADAPTER_STATE_RUNNING = 2,
	ENA_ADAPTER_STATE_STOPPED = 3,
	ENA_ADAPTER_STATE_CONFIG  = 4,
	ENA_ADAPTER_STATE_CLOSED  = 5,
};

struct ena_driver_stats {
	rte_atomic64_t ierrors;
	rte_atomic64_t oerrors;
	rte_atomic64_t rx_nombuf;
	u64 rx_drops;
};

struct ena_stats_dev {
	u64 wd_expired;
	u64 dev_start;
	u64 dev_stop;
	/*
	 * Tx drops cannot be reported as the driver statistic, because DPDK
	 * rte_eth_stats structure isn't providing appropriate field for that.
	 * As a workaround it is being published as an extended statistic.
	 */
	u64 tx_drops;
};

struct ena_offloads {
	bool tso4_supported;
	bool tx_csum_supported;
	bool rx_csum_supported;
};

/* board specific private data structure */
struct ena_adapter {
	/* OS defined structs */
	struct rte_pci_device *pdev;
	struct rte_eth_dev_data *rte_eth_dev_data;
	struct rte_eth_dev *rte_dev;

	struct ena_com_dev ena_dev __rte_cache_aligned;

	/* TX */
	struct ena_ring tx_ring[ENA_MAX_NUM_QUEUES] __rte_cache_aligned;
	u32 max_tx_ring_size;
	u16 max_tx_sgl_size;

	/* RX */
	struct ena_ring rx_ring[ENA_MAX_NUM_QUEUES] __rte_cache_aligned;
	u32 max_rx_ring_size;
	u16 max_rx_sgl_size;

	u32 max_num_io_queues;
	u16 max_mtu;
	struct ena_offloads offloads;

	int id_number;
	char name[ENA_NAME_MAX_LEN];
	u8 mac_addr[RTE_ETHER_ADDR_LEN];

	void *regs;
	void *dev_mem_base;

	struct ena_driver_stats *drv_stats;
	enum ena_adapter_state state;

	uint64_t tx_supported_offloads;
	uint64_t tx_selected_offloads;
	uint64_t rx_supported_offloads;
	uint64_t rx_selected_offloads;

	bool link_status;

	enum ena_regs_reset_reason_types reset_reason;

	struct rte_timer timer_wd;
	uint64_t timestamp_wd;
	uint64_t keep_alive_timeout;

	struct ena_stats_dev dev_stats;

	bool trigger_reset;

	bool wd_state;

	bool use_large_llq_hdr;
};

#endif /* _ENA_ETHDEV_H_ */