/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/*
 * Copyright 2015-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
 */

#ifndef ENA_COM
#define ENA_COM

#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/gfp.h>
#include <linux/io.h>
#include <linux/prefetch.h>
#include <linux/sched.h>
#include <linux/sizes.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <linux/netdevice.h>

#include "ena_common_defs.h"
#include "ena_admin_defs.h"
#include "ena_eth_io_defs.h"
#include "ena_regs_defs.h"

#undef pr_fmt
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define ENA_MAX_NUM_IO_QUEUES 128U
/* We need to queues for each IO (on for Tx and one for Rx) */
#define ENA_TOTAL_NUM_QUEUES (2 * (ENA_MAX_NUM_IO_QUEUES))

#define ENA_MAX_HANDLERS 256

#define ENA_MAX_PHYS_ADDR_SIZE_BITS 48

/* Unit in usec */
#define ENA_REG_READ_TIMEOUT 200000

#define ADMIN_SQ_SIZE(depth)    ((depth) * sizeof(struct ena_admin_aq_entry))
#define ADMIN_CQ_SIZE(depth)    ((depth) * sizeof(struct ena_admin_acq_entry))
#define ADMIN_AENQ_SIZE(depth)  ((depth) * sizeof(struct ena_admin_aenq_entry))

/*****************************************************************************/
/*****************************************************************************/
/* ENA adaptive interrupt moderation settings */

#define ENA_INTR_INITIAL_TX_INTERVAL_USECS 64
#define ENA_INTR_INITIAL_RX_INTERVAL_USECS 0
#define ENA_DEFAULT_INTR_DELAY_RESOLUTION 1

#define ENA_HASH_KEY_SIZE 40

#define ENA_HW_HINTS_NO_TIMEOUT 0xFFFF

#define ENA_FEATURE_MAX_QUEUE_EXT_VER 1

struct ena_llq_configurations {
        enum ena_admin_llq_header_location llq_header_location;
        enum ena_admin_llq_ring_entry_size llq_ring_entry_size;
        enum ena_admin_llq_stride_ctrl  llq_stride_ctrl;
        enum ena_admin_llq_num_descs_before_header llq_num_decs_before_header;
        u16 llq_ring_entry_size_value;
};

enum queue_direction {
        ENA_COM_IO_QUEUE_DIRECTION_TX,
        ENA_COM_IO_QUEUE_DIRECTION_RX
};

struct ena_com_buf {
        dma_addr_t paddr; /**< Buffer physical address */
        u16 len; /**< Buffer length in bytes */
};

struct ena_com_rx_buf_info {
        u16 len;
        u16 req_id;
};

struct ena_com_io_desc_addr {
        u8 __iomem *pbuf_dev_addr; /* LLQ address */
        u8 *virt_addr;
        dma_addr_t phys_addr;
};

struct ena_com_tx_meta {
        u16 mss;
        u16 l3_hdr_len;
        u16 l3_hdr_offset;
        u16 l4_hdr_len; /* In words */
};

struct ena_com_llq_info {
        u16 header_location_ctrl;
        u16 desc_stride_ctrl;
        u16 desc_list_entry_size_ctrl;
        u16 desc_list_entry_size;
        u16 descs_num_before_header;
        u16 descs_per_entry;
        u16 max_entries_in_tx_burst;
        bool disable_meta_caching;
};

struct ena_com_io_cq {
        struct ena_com_io_desc_addr cdesc_addr;

        /* Interrupt unmask register */
        u32 __iomem *unmask_reg;

        /* The completion queue head doorbell register */
        u32 __iomem *cq_head_db_reg;

        /* numa configuration register (for TPH) */
        u32 __iomem *numa_node_cfg_reg;

        /* The value to write to the above register to unmask
         * the interrupt of this queue
         */
        u32 msix_vector;

        enum queue_direction direction;

        /* holds the number of cdesc of the current packet */
        u16 cur_rx_pkt_cdesc_count;
        /* save the firt cdesc idx of the current packet */
        u16 cur_rx_pkt_cdesc_start_idx;

        u16 q_depth;
        /* Caller qid */
        u16 qid;

        /* Device queue index */
        u16 idx;
        u16 head;
        u16 last_head_update;
        u8 phase;
        u8 cdesc_entry_size_in_bytes;

} ____cacheline_aligned;

struct ena_com_io_bounce_buffer_control {
        u8 *base_buffer;
        u16 next_to_use;
        u16 buffer_size;
        u16 buffers_num;  /* Must be a power of 2 */
};

/* This struct is to keep tracking the current location of the next llq entry */
struct ena_com_llq_pkt_ctrl {
        u8 *curr_bounce_buf;
        u16 idx;
        u16 descs_left_in_line;
};

struct ena_com_io_sq {
        struct ena_com_io_desc_addr desc_addr;

        u32 __iomem *db_addr;
        u8 __iomem *header_addr;

        enum queue_direction direction;
        enum ena_admin_placement_policy_type mem_queue_type;

        bool disable_meta_caching;

        u32 msix_vector;
        struct ena_com_tx_meta cached_tx_meta;
        struct ena_com_llq_info llq_info;
        struct ena_com_llq_pkt_ctrl llq_buf_ctrl;
        struct ena_com_io_bounce_buffer_control bounce_buf_ctrl;

        u16 q_depth;
        u16 qid;

        u16 idx;
        u16 tail;
        u16 next_to_comp;
        u16 llq_last_copy_tail;
        u32 tx_max_header_size;
        u8 phase;
        u8 desc_entry_size;
        u8 dma_addr_bits;
        u16 entries_in_tx_burst_left;
} ____cacheline_aligned;

struct ena_com_admin_cq {
        struct ena_admin_acq_entry *entries;
        dma_addr_t dma_addr;

        u16 head;
        u8 phase;
};

struct ena_com_admin_sq {
        struct ena_admin_aq_entry *entries;
        dma_addr_t dma_addr;

        u32 __iomem *db_addr;

        u16 head;
        u16 tail;
        u8 phase;

};

struct ena_com_stats_admin {
        u64 aborted_cmd;
        u64 submitted_cmd;
        u64 completed_cmd;
        u64 out_of_space;
        u64 no_completion;
};

struct ena_com_admin_queue {
        void *q_dmadev;
        struct ena_com_dev *ena_dev;
        spinlock_t q_lock; /* spinlock for the admin queue */

        struct ena_comp_ctx *comp_ctx;
        u32 completion_timeout;
        u16 q_depth;
        struct ena_com_admin_cq cq;
        struct ena_com_admin_sq sq;

        /* Indicate if the admin queue should poll for completion */
        bool polling;

        /* Define if fallback to polling mode should occur */
        bool auto_polling;

        u16 curr_cmd_id;

        /* Indicate that the ena was initialized and can
         * process new admin commands
         */
        bool running_state;

        /* Count the number of outstanding admin commands */
        atomic_t outstanding_cmds;

        struct ena_com_stats_admin stats;
};

struct ena_aenq_handlers;

struct ena_com_aenq {
        u16 head;
        u8 phase;
        struct ena_admin_aenq_entry *entries;
        dma_addr_t dma_addr;
        u16 q_depth;
        struct ena_aenq_handlers *aenq_handlers;
};

struct ena_com_mmio_read {
        struct ena_admin_ena_mmio_req_read_less_resp *read_resp;
        dma_addr_t read_resp_dma_addr;
        u32 reg_read_to; /* in us */
        u16 seq_num;
        bool readless_supported;
        /* spin lock to ensure a single outstanding read */
        spinlock_t lock;
};

struct ena_rss {
        /* Indirect table */
        u16 *host_rss_ind_tbl;
        struct ena_admin_rss_ind_table_entry *rss_ind_tbl;
        dma_addr_t rss_ind_tbl_dma_addr;
        u16 tbl_log_size;

        /* Hash key */
        enum ena_admin_hash_functions hash_func;
        struct ena_admin_feature_rss_flow_hash_control *hash_key;
        dma_addr_t hash_key_dma_addr;
        u32 hash_init_val;

        /* Flow Control */
        struct ena_admin_feature_rss_hash_control *hash_ctrl;
        dma_addr_t hash_ctrl_dma_addr;

};

struct ena_host_attribute {
        /* Debug area */
        u8 *debug_area_virt_addr;
        dma_addr_t debug_area_dma_addr;
        u32 debug_area_size;

        /* Host information */
        struct ena_admin_host_info *host_info;
        dma_addr_t host_info_dma_addr;
};

/* Each ena_dev is a PCI function. */
struct ena_com_dev {
        struct ena_com_admin_queue admin_queue;
        struct ena_com_aenq aenq;
        struct ena_com_io_cq io_cq_queues[ENA_TOTAL_NUM_QUEUES];
        struct ena_com_io_sq io_sq_queues[ENA_TOTAL_NUM_QUEUES];
        u8 __iomem *reg_bar;
        void __iomem *mem_bar;
        void *dmadev;

        enum ena_admin_placement_policy_type tx_mem_queue_type;
        u32 tx_max_header_size;
        u16 stats_func; /* Selected function for extended statistic dump */
        u16 stats_queue; /* Selected queue for extended statistic dump */

        struct ena_com_mmio_read mmio_read;

        struct ena_rss rss;
        u32 supported_features;
        u32 dma_addr_bits;

        struct ena_host_attribute host_attr;
        bool adaptive_coalescing;
        u16 intr_delay_resolution;

        /* interrupt moderation intervals are in usec divided by
         * intr_delay_resolution, which is supplied by the device.
         */
        u32 intr_moder_tx_interval;
        u32 intr_moder_rx_interval;

        struct ena_intr_moder_entry *intr_moder_tbl;

        struct ena_com_llq_info llq_info;

        u32 ena_min_poll_delay_us;
};

struct ena_com_dev_get_features_ctx {
        struct ena_admin_queue_feature_desc max_queues;
        struct ena_admin_queue_ext_feature_desc max_queue_ext;
        struct ena_admin_device_attr_feature_desc dev_attr;
        struct ena_admin_feature_aenq_desc aenq;
        struct ena_admin_feature_offload_desc offload;
        struct ena_admin_ena_hw_hints hw_hints;
        struct ena_admin_feature_llq_desc llq;
};

struct ena_com_create_io_ctx {
        enum ena_admin_placement_policy_type mem_queue_type;
        enum queue_direction direction;
        int numa_node;
        u32 msix_vector;
        u16 queue_size;
        u16 qid;
};

typedef void (*ena_aenq_handler)(void *data,
        struct ena_admin_aenq_entry *aenq_e);

/* Holds aenq handlers. Indexed by AENQ event group */
struct ena_aenq_handlers {
        ena_aenq_handler handlers[ENA_MAX_HANDLERS];
        ena_aenq_handler unimplemented_handler;
};

/*****************************************************************************/
/*****************************************************************************/

/* ena_com_mmio_reg_read_request_init - Init the mmio reg read mechanism
 * @ena_dev: ENA communication layer struct
 *
 * Initialize the register read mechanism.
 *
 * @note: This method must be the first stage in the initialization sequence.
 *
 * @return - 0 on success, negative value on failure.
 */
int ena_com_mmio_reg_read_request_init(struct ena_com_dev *ena_dev);

/* ena_com_set_mmio_read_mode - Enable/disable the indirect mmio reg read mechanism
 * @ena_dev: ENA communication layer struct
 * @readless_supported: readless mode (enable/disable)
 */
void ena_com_set_mmio_read_mode(struct ena_com_dev *ena_dev,
                                bool readless_supported);

/* ena_com_mmio_reg_read_request_write_dev_addr - Write the mmio reg read return
 * value physical address.
 * @ena_dev: ENA communication layer struct
 */
void ena_com_mmio_reg_read_request_write_dev_addr(struct ena_com_dev *ena_dev);

/* ena_com_mmio_reg_read_request_destroy - Destroy the mmio reg read mechanism
 * @ena_dev: ENA communication layer struct
 */
void ena_com_mmio_reg_read_request_destroy(struct ena_com_dev *ena_dev);

/* ena_com_admin_init - Init the admin and the async queues
 * @ena_dev: ENA communication layer struct
 * @aenq_handlers: Those handlers to be called upon event.
 *
 * Initialize the admin submission and completion queues.
 * Initialize the asynchronous events notification queues.
 *
 * @return - 0 on success, negative value on failure.
 */
int ena_com_admin_init(struct ena_com_dev *ena_dev,
                       struct ena_aenq_handlers *aenq_handlers);

/* ena_com_admin_destroy - Destroy the admin and the async events queues.
 * @ena_dev: ENA communication layer struct
 *
 * @note: Before calling this method, the caller must validate that the device
 * won't send any additional admin completions/aenq.
 * To achieve that, a FLR is recommended.
 */
void ena_com_admin_destroy(struct ena_com_dev *ena_dev);

/* ena_com_dev_reset - Perform device FLR to the device.
 * @ena_dev: ENA communication layer struct
 * @reset_reason: Specify what is the trigger for the reset in case of an error.
 *
 * @return - 0 on success, negative value on failure.
 */
int ena_com_dev_reset(struct ena_com_dev *ena_dev,
                      enum ena_regs_reset_reason_types reset_reason);

/* ena_com_create_io_queue - Create io queue.
 * @ena_dev: ENA communication layer struct
 * @ctx - create context structure
 *
 * Create the submission and the completion queues.
 *
 * @return - 0 on success, negative value on failure.
 */
int ena_com_create_io_queue(struct ena_com_dev *ena_dev,
                            struct ena_com_create_io_ctx *ctx);

/* ena_com_destroy_io_queue - Destroy IO queue with the queue id - qid.
 * @ena_dev: ENA communication layer struct
 * @qid - the caller virtual queue id.
 */
void ena_com_destroy_io_queue(struct ena_com_dev *ena_dev, u16 qid);

/* ena_com_get_io_handlers - Return the io queue handlers
 * @ena_dev: ENA communication layer struct
 * @qid - the caller virtual queue id.
 * @io_sq - IO submission queue handler
 * @io_cq - IO completion queue handler.
 *
 * @return - 0 on success, negative value on failure.
 */
int ena_com_get_io_handlers(struct ena_com_dev *ena_dev, u16 qid,
                            struct ena_com_io_sq **io_sq,
                            struct ena_com_io_cq **io_cq);

/* ena_com_admin_aenq_enable - ENAble asynchronous event notifications
 * @ena_dev: ENA communication layer struct
 *
 * After this method, aenq event can be received via AENQ.
 */
void ena_com_admin_aenq_enable(struct ena_com_dev *ena_dev);

/* ena_com_set_admin_running_state - Set the state of the admin queue
 * @ena_dev: ENA communication layer struct
 *
 * Change the state of the admin queue (enable/disable)
 */
void ena_com_set_admin_running_state(struct ena_com_dev *ena_dev, bool state);

/* ena_com_get_admin_running_state - Get the admin queue state
 * @ena_dev: ENA communication layer struct
 *
 * Retrieve the state of the admin queue (enable/disable)
 *
 * @return - current polling mode (enable/disable)
 */
bool ena_com_get_admin_running_state(struct ena_com_dev *ena_dev);

/* ena_com_set_admin_polling_mode - Set the admin completion queue polling mode
 * @ena_dev: ENA communication layer struct
 * @polling: ENAble/Disable polling mode
 *
 * Set the admin completion mode.
 */
void ena_com_set_admin_polling_mode(struct ena_com_dev *ena_dev, bool polling);

/* ena_com_set_admin_auto_polling_mode - Enable autoswitch to polling mode
 * @ena_dev: ENA communication layer struct
 * @polling: Enable/Disable polling mode
 *
 * Set the autopolling mode.
 * If autopolling is on:
 * In case of missing interrupt when data is available switch to polling.
 */
void ena_com_set_admin_auto_polling_mode(struct ena_com_dev *ena_dev,
                                         bool polling);

/* ena_com_admin_q_comp_intr_handler - admin queue interrupt handler
 * @ena_dev: ENA communication layer struct
 *
 * This method goes over the admin completion queue and wakes up all the pending
 * threads that wait on the commands wait event.
 *
 * @note: Should be called after MSI-X interrupt.
 */
void ena_com_admin_q_comp_intr_handler(struct ena_com_dev *ena_dev);

/* ena_com_aenq_intr_handler - AENQ interrupt handler
 * @ena_dev: ENA communication layer struct
 *
 * This method goes over the async event notification queue and calls the proper
 * aenq handler.
 */
void ena_com_aenq_intr_handler(struct ena_com_dev *ena_dev, void *data);

/* ena_com_abort_admin_commands - Abort all the outstanding admin commands.
 * @ena_dev: ENA communication layer struct
 *
 * This method aborts all the outstanding admin commands.
 * The caller should then call ena_com_wait_for_abort_completion to make sure
 * all the commands were completed.
 */
void ena_com_abort_admin_commands(struct ena_com_dev *ena_dev);

/* ena_com_wait_for_abort_completion - Wait for admin commands abort.
 * @ena_dev: ENA communication layer struct
 *
 * This method waits until all the outstanding admin commands are completed.
 */
void ena_com_wait_for_abort_completion(struct ena_com_dev *ena_dev);

/* ena_com_validate_version - Validate the device parameters
 * @ena_dev: ENA communication layer struct
 *
 * This method verifies the device parameters are the same as the saved
 * parameters in ena_dev.
 * This method is useful after device reset, to validate the device mac address
 * and the device offloads are the same as before the reset.
 *
 * @return - 0 on success negative value otherwise.
 */
int ena_com_validate_version(struct ena_com_dev *ena_dev);

/* ena_com_get_link_params - Retrieve physical link parameters.
 * @ena_dev: ENA communication layer struct
 * @resp: Link parameters
 *
 * Retrieve the physical link parameters,
 * like speed, auto-negotiation and full duplex support.
 *
 * @return - 0 on Success negative value otherwise.
 */
int ena_com_get_link_params(struct ena_com_dev *ena_dev,
                            struct ena_admin_get_feat_resp *resp);

/* ena_com_get_dma_width - Retrieve physical dma address width the device
 * supports.
 * @ena_dev: ENA communication layer struct
 *
 * Retrieve the maximum physical address bits the device can handle.
 *
 * @return: > 0 on Success and negative value otherwise.
 */
int ena_com_get_dma_width(struct ena_com_dev *ena_dev);

/* ena_com_set_aenq_config - Set aenq groups configurations
 * @ena_dev: ENA communication layer struct
 * @groups flag: bit fields flags of enum ena_admin_aenq_group.
 *
 * Configure which aenq event group the driver would like to receive.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_set_aenq_config(struct ena_com_dev *ena_dev, u32 groups_flag);

/* ena_com_get_dev_attr_feat - Get device features
 * @ena_dev: ENA communication layer struct
 * @get_feat_ctx: returned context that contain the get features.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_get_dev_attr_feat(struct ena_com_dev *ena_dev,
                              struct ena_com_dev_get_features_ctx *get_feat_ctx);

/* ena_com_get_dev_basic_stats - Get device basic statistics
 * @ena_dev: ENA communication layer struct
 * @stats: stats return value
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_get_dev_basic_stats(struct ena_com_dev *ena_dev,
                                struct ena_admin_basic_stats *stats);

/* ena_com_get_eni_stats - Get extended network interface statistics
 * @ena_dev: ENA communication layer struct
 * @stats: stats return value
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_get_eni_stats(struct ena_com_dev *ena_dev,
                          struct ena_admin_eni_stats *stats);

/* ena_com_set_dev_mtu - Configure the device mtu.
 * @ena_dev: ENA communication layer struct
 * @mtu: mtu value
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_set_dev_mtu(struct ena_com_dev *ena_dev, int mtu);

/* ena_com_get_offload_settings - Retrieve the device offloads capabilities
 * @ena_dev: ENA communication layer struct
 * @offlad: offload return value
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_get_offload_settings(struct ena_com_dev *ena_dev,
                                 struct ena_admin_feature_offload_desc *offload);

/* ena_com_rss_init - Init RSS
 * @ena_dev: ENA communication layer struct
 * @log_size: indirection log size
 *
 * Allocate RSS/RFS resources.
 * The caller then can configure rss using ena_com_set_hash_function,
 * ena_com_set_hash_ctrl and ena_com_indirect_table_set.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_rss_init(struct ena_com_dev *ena_dev, u16 log_size);

/* ena_com_rss_destroy - Destroy rss
 * @ena_dev: ENA communication layer struct
 *
 * Free all the RSS/RFS resources.
 */
void ena_com_rss_destroy(struct ena_com_dev *ena_dev);

/* ena_com_get_current_hash_function - Get RSS hash function
 * @ena_dev: ENA communication layer struct
 *
 * Return the current hash function.
 * @return: 0 or one of the ena_admin_hash_functions values.
 */
int ena_com_get_current_hash_function(struct ena_com_dev *ena_dev);

/* ena_com_fill_hash_function - Fill RSS hash function
 * @ena_dev: ENA communication layer struct
 * @func: The hash function (Toeplitz or crc)
 * @key: Hash key (for toeplitz hash)
 * @key_len: key length (max length 10 DW)
 * @init_val: initial value for the hash function
 *
 * Fill the ena_dev resources with the desire hash function, hash key, key_len
 * and key initial value (if needed by the hash function).
 * To flush the key into the device the caller should call
 * ena_com_set_hash_function.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_fill_hash_function(struct ena_com_dev *ena_dev,
                               enum ena_admin_hash_functions func,
                               const u8 *key, u16 key_len, u32 init_val);

/* ena_com_set_hash_function - Flush the hash function and it dependencies to
 * the device.
 * @ena_dev: ENA communication layer struct
 *
 * Flush the hash function and it dependencies (key, key length and
 * initial value) if needed.
 *
 * @note: Prior to this method the caller should call ena_com_fill_hash_function
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_set_hash_function(struct ena_com_dev *ena_dev);

/* ena_com_get_hash_function - Retrieve the hash function from the device.
 * @ena_dev: ENA communication layer struct
 * @func: hash function
 *
 * Retrieve the hash function from the device.
 *
 * @note: If the caller called ena_com_fill_hash_function but didn't flush
 * it to the device, the new configuration will be lost.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_get_hash_function(struct ena_com_dev *ena_dev,
                              enum ena_admin_hash_functions *func);

/* ena_com_get_hash_key - Retrieve the hash key
 * @ena_dev: ENA communication layer struct
 * @key: hash key
 *
 * Retrieve the hash key.
 *
 * @note: If the caller called ena_com_fill_hash_key but didn't flush
 * it to the device, the new configuration will be lost.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_get_hash_key(struct ena_com_dev *ena_dev, u8 *key);
/* ena_com_fill_hash_ctrl - Fill RSS hash control
 * @ena_dev: ENA communication layer struct.
 * @proto: The protocol to configure.
 * @hash_fields: bit mask of ena_admin_flow_hash_fields
 *
 * Fill the ena_dev resources with the desire hash control (the ethernet
 * fields that take part of the hash) for a specific protocol.
 * To flush the hash control to the device, the caller should call
 * ena_com_set_hash_ctrl.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_fill_hash_ctrl(struct ena_com_dev *ena_dev,
                           enum ena_admin_flow_hash_proto proto,
                           u16 hash_fields);

/* ena_com_set_hash_ctrl - Flush the hash control resources to the device.
 * @ena_dev: ENA communication layer struct
 *
 * Flush the hash control (the ethernet fields that take part of the hash)
 *
 * @note: Prior to this method the caller should call ena_com_fill_hash_ctrl.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_set_hash_ctrl(struct ena_com_dev *ena_dev);

/* ena_com_get_hash_ctrl - Retrieve the hash control from the device.
 * @ena_dev: ENA communication layer struct
 * @proto: The protocol to retrieve.
 * @fields: bit mask of ena_admin_flow_hash_fields.
 *
 * Retrieve the hash control from the device.
 *
 * @note: If the caller called ena_com_fill_hash_ctrl but didn't flush
 * it to the device, the new configuration will be lost.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_get_hash_ctrl(struct ena_com_dev *ena_dev,
                          enum ena_admin_flow_hash_proto proto,
                          u16 *fields);

/* ena_com_set_default_hash_ctrl - Set the hash control to a default
 * configuration.
 * @ena_dev: ENA communication layer struct
 *
 * Fill the ena_dev resources with the default hash control configuration.
 * To flush the hash control to the device, the caller should call
 * ena_com_set_hash_ctrl.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_set_default_hash_ctrl(struct ena_com_dev *ena_dev);

/* ena_com_indirect_table_fill_entry - Fill a single entry in the RSS
 * indirection table
 * @ena_dev: ENA communication layer struct.
 * @entry_idx - indirection table entry.
 * @entry_value - redirection value
 *
 * Fill a single entry of the RSS indirection table in the ena_dev resources.
 * To flush the indirection table to the device, the called should call
 * ena_com_indirect_table_set.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_indirect_table_fill_entry(struct ena_com_dev *ena_dev,
                                      u16 entry_idx, u16 entry_value);

/* ena_com_indirect_table_set - Flush the indirection table to the device.
 * @ena_dev: ENA communication layer struct
 *
 * Flush the indirection hash control to the device.
 * Prior to this method the caller should call ena_com_indirect_table_fill_entry
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_indirect_table_set(struct ena_com_dev *ena_dev);

/* ena_com_indirect_table_get - Retrieve the indirection table from the device.
 * @ena_dev: ENA communication layer struct
 * @ind_tbl: indirection table
 *
 * Retrieve the RSS indirection table from the device.
 *
 * @note: If the caller called ena_com_indirect_table_fill_entry but didn't flush
 * it to the device, the new configuration will be lost.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_indirect_table_get(struct ena_com_dev *ena_dev, u32 *ind_tbl);

/* ena_com_allocate_host_info - Allocate host info resources.
 * @ena_dev: ENA communication layer struct
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_allocate_host_info(struct ena_com_dev *ena_dev);

/* ena_com_allocate_debug_area - Allocate debug area.
 * @ena_dev: ENA communication layer struct
 * @debug_area_size - debug area size.
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_allocate_debug_area(struct ena_com_dev *ena_dev,
                                u32 debug_area_size);

/* ena_com_delete_debug_area - Free the debug area resources.
 * @ena_dev: ENA communication layer struct
 *
 * Free the allocated debug area.
 */
void ena_com_delete_debug_area(struct ena_com_dev *ena_dev);

/* ena_com_delete_host_info - Free the host info resources.
 * @ena_dev: ENA communication layer struct
 *
 * Free the allocated host info.
 */
void ena_com_delete_host_info(struct ena_com_dev *ena_dev);

/* ena_com_set_host_attributes - Update the device with the host
 * attributes (debug area and host info) base address.
 * @ena_dev: ENA communication layer struct
 *
 * @return: 0 on Success and negative value otherwise.
 */
int ena_com_set_host_attributes(struct ena_com_dev *ena_dev);

/* ena_com_create_io_cq - Create io completion queue.
 * @ena_dev: ENA communication layer struct
 * @io_cq - io completion queue handler

 * Create IO completion queue.
 *
 * @return - 0 on success, negative value on failure.
 */
int ena_com_create_io_cq(struct ena_com_dev *ena_dev,
                         struct ena_com_io_cq *io_cq);

/* ena_com_destroy_io_cq - Destroy io completion queue.
 * @ena_dev: ENA communication layer struct
 * @io_cq - io completion queue handler

 * Destroy IO completion queue.
 *
 * @return - 0 on success, negative value on failure.
 */
int ena_com_destroy_io_cq(struct ena_com_dev *ena_dev,
                          struct ena_com_io_cq *io_cq);

/* ena_com_execute_admin_command - Execute admin command
 * @admin_queue: admin queue.
 * @cmd: the admin command to execute.
 * @cmd_size: the command size.
 * @cmd_completion: command completion return value.
 * @cmd_comp_size: command completion size.

 * Submit an admin command and then wait until the device returns a
 * completion.
 * The completion will be copied into cmd_comp.
 *
 * @return - 0 on success, negative value on failure.
 */
int ena_com_execute_admin_command(struct ena_com_admin_queue *admin_queue,
                                  struct ena_admin_aq_entry *cmd,
                                  size_t cmd_size,
                                  struct ena_admin_acq_entry *cmd_comp,
                                  size_t cmd_comp_size);

/* ena_com_init_interrupt_moderation - Init interrupt moderation
 * @ena_dev: ENA communication layer struct
 *
 * @return - 0 on success, negative value on failure.
 */
int ena_com_init_interrupt_moderation(struct ena_com_dev *ena_dev);

/* ena_com_interrupt_moderation_supported - Return if interrupt moderation
 * capability is supported by the device.
 *
 * @return - supported or not.
 */
bool ena_com_interrupt_moderation_supported(struct ena_com_dev *ena_dev);

/* ena_com_update_nonadaptive_moderation_interval_tx - Update the
 * non-adaptive interval in Tx direction.
 * @ena_dev: ENA communication layer struct
 * @tx_coalesce_usecs: Interval in usec.
 *
 * @return - 0 on success, negative value on failure.
 */
int ena_com_update_nonadaptive_moderation_interval_tx(struct ena_com_dev *ena_dev,
                                                      u32 tx_coalesce_usecs);

/* ena_com_update_nonadaptive_moderation_interval_rx - Update the
 * non-adaptive interval in Rx direction.
 * @ena_dev: ENA communication layer struct
 * @rx_coalesce_usecs: Interval in usec.
 *
 * @return - 0 on success, negative value on failure.
 */
int ena_com_update_nonadaptive_moderation_interval_rx(struct ena_com_dev *ena_dev,
                                                      u32 rx_coalesce_usecs);

/* ena_com_get_nonadaptive_moderation_interval_tx - Retrieve the
 * non-adaptive interval in Tx direction.
 * @ena_dev: ENA communication layer struct
 *
 * @return - interval in usec
 */
unsigned int ena_com_get_nonadaptive_moderation_interval_tx(struct ena_com_dev *ena_dev);

/* ena_com_get_nonadaptive_moderation_interval_rx - Retrieve the
 * non-adaptive interval in Rx direction.
 * @ena_dev: ENA communication layer struct
 *
 * @return - interval in usec
 */
unsigned int ena_com_get_nonadaptive_moderation_interval_rx(struct ena_com_dev *ena_dev);

/* ena_com_config_dev_mode - Configure the placement policy of the device.
 * @ena_dev: ENA communication layer struct
 * @llq_features: LLQ feature descriptor, retrieve via
 *                 ena_com_get_dev_attr_feat.
 * @ena_llq_config: The default driver LLQ parameters configurations
 */
int ena_com_config_dev_mode(struct ena_com_dev *ena_dev,
                            struct ena_admin_feature_llq_desc *llq_features,
                            struct ena_llq_configurations *llq_default_config);

static inline bool ena_com_get_adaptive_moderation_enabled(struct ena_com_dev *ena_dev)
{
        return ena_dev->adaptive_coalescing;
}

static inline void ena_com_enable_adaptive_moderation(struct ena_com_dev *ena_dev)
{
        ena_dev->adaptive_coalescing = true;
}

static inline void ena_com_disable_adaptive_moderation(struct ena_com_dev *ena_dev)
{
        ena_dev->adaptive_coalescing = false;
}

/* ena_com_update_intr_reg - Prepare interrupt register
 * @intr_reg: interrupt register to update.
 * @rx_delay_interval: Rx interval in usecs
 * @tx_delay_interval: Tx interval in usecs
 * @unmask: unmask enable/disable
 *
 * Prepare interrupt update register with the supplied parameters.
 */
static inline void ena_com_update_intr_reg(struct ena_eth_io_intr_reg *intr_reg,
                                           u32 rx_delay_interval,
                                           u32 tx_delay_interval,
                                           bool unmask)
{
        intr_reg->intr_control = 0;
        intr_reg->intr_control |= rx_delay_interval &
                ENA_ETH_IO_INTR_REG_RX_INTR_DELAY_MASK;

        intr_reg->intr_control |=
                (tx_delay_interval << ENA_ETH_IO_INTR_REG_TX_INTR_DELAY_SHIFT)
                & ENA_ETH_IO_INTR_REG_TX_INTR_DELAY_MASK;

        if (unmask)
                intr_reg->intr_control |= ENA_ETH_IO_INTR_REG_INTR_UNMASK_MASK;
}

static inline u8 *ena_com_get_next_bounce_buffer(struct ena_com_io_bounce_buffer_control *bounce_buf_ctrl)
{
        u16 size, buffers_num;
        u8 *buf;

        size = bounce_buf_ctrl->buffer_size;
        buffers_num = bounce_buf_ctrl->buffers_num;

        buf = bounce_buf_ctrl->base_buffer +
                (bounce_buf_ctrl->next_to_use++ & (buffers_num - 1)) * size;

        prefetchw(bounce_buf_ctrl->base_buffer +
                (bounce_buf_ctrl->next_to_use & (buffers_num - 1)) * size);

        return buf;
}

#endif /* !(ENA_COM) */