/*
 * Copyright (c) 2016 Nordic Semiconductor ASA
 * Copyright (c) 2016 Vinayak Kariappa Chettimada
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/*
 * PDU fields sizes
 */

#define PDU_PREAMBLE_SIZE(phy) (phy&0x3)
#define PDU_ACCESS_ADDR_SIZE   4
#define PDU_HEADER_SIZE        2
#define PDU_MIC_SIZE           4
#define PDU_CRC_SIZE           3
#define PDU_OVERHEAD_SIZE(phy) (PDU_PREAMBLE_SIZE(phy) + \
				PDU_ACCESS_ADDR_SIZE + \
				PDU_HEADER_SIZE + \
				PDU_CRC_SIZE)

#define BDADDR_SIZE   6
#define ADVA_SIZE     BDADDR_SIZE
#define SCANA_SIZE    BDADDR_SIZE
#define INITA_SIZE    BDADDR_SIZE
#define TARGETA_SIZE  BDADDR_SIZE
#define LLDATA_SIZE   22

/* Constant offsets in extended header (TargetA is present in PDUs with AdvA) */
#define ADVA_OFFSET   0
#define TGTA_OFFSET   (ADVA_OFFSET + BDADDR_SIZE)

#define BYTES2US(bytes, phy) (((bytes)<<3)/BIT((phy&0x3)>>1))

/* Advertisement channel minimum payload size */
#define PDU_AC_PAYLOAD_SIZE_MIN 1
/* Advertisement channel maximum legacy payload size */
#define PDU_AC_LEG_PAYLOAD_SIZE_MAX 37
/* Advertisement channel maximum extended payload size */
#define PDU_AC_EXT_PAYLOAD_SIZE_MAX 255

/* Advertisement channel maximum payload size */
#if defined(CONFIG_BT_CTLR_ADV_EXT)
#define PDU_AC_EXT_HEADER_SIZE_MIN  offsetof(struct pdu_adv_com_ext_adv, \
					     ext_hdr_adv_data)
#define PDU_AC_EXT_HEADER_SIZE_MAX  63
/* TODO: PDU_AC_EXT_PAYLOAD_OVERHEAD can be reduced based on supported
 *       features, like omitting support for periodic advertising will reduce
 *       18 octets in the Common Extended Advertising Payload Format.
 */
#define PDU_AC_EXT_PAYLOAD_OVERHEAD (PDU_AC_EXT_HEADER_SIZE_MIN + \
				     PDU_AC_EXT_HEADER_SIZE_MAX)
#define PDU_AC_PAYLOAD_SIZE_MAX     MAX(MIN((PDU_AC_EXT_PAYLOAD_OVERHEAD + \
					     CONFIG_BT_CTLR_ADV_DATA_LEN_MAX), \
					    PDU_AC_EXT_PAYLOAD_SIZE_MAX), \
					PDU_AC_LEG_PAYLOAD_SIZE_MAX)
#else
#define PDU_AC_PAYLOAD_SIZE_MAX     PDU_AC_LEG_PAYLOAD_SIZE_MAX
#endif

/* Link Layer header size of Adv PDU. Assumes pdu_adv is packed */
#define PDU_AC_LL_HEADER_SIZE  (offsetof(struct pdu_adv, payload))

/* Link Layer Advertisement channel maximum PDU buffer size */
#define PDU_AC_LL_SIZE_MAX     (PDU_AC_LL_HEADER_SIZE + PDU_AC_PAYLOAD_SIZE_MAX)

/* Advertisement channel maximum legacy advertising/scan data size */
#define PDU_AC_DATA_SIZE_MAX   31

/* Advertisement channel Access Address */
#define PDU_AC_ACCESS_ADDR     0x8e89bed6

/* Advertisement channel CRC init value */
#define PDU_AC_CRC_IV          0x555555

/* CRC polynomial */
#define PDU_CRC_POLYNOMIAL     ((0x5bUL) | ((0x06UL) << 8) | ((0x00UL) << 16))

/* Data channel minimum payload size and time */
#define PDU_DC_PAYLOAD_SIZE_MIN 27
#define PDU_DC_PAYLOAD_TIME_MIN 328
#define PDU_DC_PAYLOAD_TIME_MIN_CODED 2704

/* Link Layer header size of Data PDU. Assumes pdu_data is packed */
#define PDU_DC_LL_HEADER_SIZE  (offsetof(struct pdu_data, lldata))

/* Link Layer Max size of an empty PDU. TODO: Remove; only used in Nordic LLL */
#define PDU_EM_LL_SIZE_MAX     (PDU_DC_LL_HEADER_SIZE)

/* Link Layer header size of BIS PDU. Assumes pdu_bis is packed */
#define PDU_BIS_LL_HEADER_SIZE (offsetof(struct pdu_bis, payload))

/* Event Active Clock Jitter */
#define EVENT_CLOCK_JITTER_US   2
/* Event interframe timings */
#define EVENT_IFS_US            150
/* Standard allows 2 us timing uncertainty inside the event */
#define EVENT_IFS_MAX_US        (EVENT_IFS_US + EVENT_CLOCK_JITTER_US)
/* Controller will layout extended adv with minimum separation */
#define EVENT_MAFS_US           300
/* Standard allows 2 us timing uncertainty inside the event */
#define EVENT_MAFS_MAX_US       (EVENT_MAFS_US + EVENT_CLOCK_JITTER_US)
/* Controller defined back to back transmit MAFS for extended advertising */
#define EVENT_B2B_MAFS_US       (CONFIG_BT_CTLR_ADV_PDU_BACK2BACK_AFS)
/* Controller defined back to back transmit MAFS for periodic advertising */
#define EVENT_SYNC_B2B_MAFS_US  (CONFIG_BT_CTLR_ADV_SYNC_PDU_BACK2BACK_AFS)
/* Minimum Subevent Space timings */
#define EVENT_MSS_US            150
/* Standard allows 2 us timing uncertainty inside the event */
#define EVENT_MSS_MAX_US        (EVENT_MSS_US + EVENT_CLOCK_JITTER_US)

/* Instant maximum value and maximum latency (or delta) past the instant */
#define EVENT_INSTANT_MAX         0xffff
#define EVENT_INSTANT_LATENCY_MAX 0x7fff

/* Channel Map Unused channels count minimum */
#define CHM_USED_COUNT_MIN     2U

/* Channel Map hop count minimum and maximum */
#define CHM_HOP_COUNT_MIN      5U
#define CHM_HOP_COUNT_MAX      16U

/* Offset Units field encoding */
#define OFFS_UNIT_BITS         13
#define OFFS_UNIT_30_US        30
#define OFFS_UNIT_300_US       300
#define OFFS_UNIT_VALUE_30_US  0
#define OFFS_UNIT_VALUE_300_US 1
/* Value specified in BT Spec. Vol 6, Part B, section 2.3.4.6 */
#define OFFS_ADJUST_US         2457600UL

/* Advertiser's Sleep Clock Accuracy Value */
#define SCA_500_PPM       500 /* 51 ppm to 500 ppm */
#define SCA_50_PPM        50  /* 0 ppm to 50 ppm */
#define SCA_VALUE_500_PPM 0   /* 51 ppm to 500 ppm */
#define SCA_VALUE_50_PPM  1   /* 0 ppm to 50 ppm */

/* Sleep Clock Accuracy, calculate drift in microseconds */
#define SCA_DRIFT_50_PPM_US(t)  (((t) * 50UL) / 1000000UL)
#define SCA_DRIFT_500_PPM_US(t) (((t) * 500UL) / 1000000UL)

/* transmitWindowDelay times (us) */
#define WIN_DELAY_LEGACY     1250
#define WIN_DELAY_UNCODED    2500
#define WIN_DELAY_CODED      3750

/* Channel Map Size */
#define PDU_CHANNEL_MAP_SIZE 5

/* Advertising Data */
#define PDU_ADV_DATA_HEADER_SIZE        2U
#define PDU_ADV_DATA_HEADER_LEN_SIZE    1U
#define PDU_ADV_DATA_HEADER_TYPE_SIZE   1U
#define PDU_ADV_DATA_HEADER_LEN_OFFSET  0U
#define PDU_ADV_DATA_HEADER_TYPE_OFFSET 1U
#define PDU_ADV_DATA_HEADER_DATA_OFFSET 2U

/*
 * Macros to return correct Data Channel PDU time
 * Note: formula is valid for 1M, 2M and Coded S8
 * see BT spec Version 5.1 Vol 6. Part B, chapters 2.1 and 2.2
 * for packet formats and thus lengths
 */

#define PHY_LEGACY   0
#define PHY_1M       BIT(0)
#define PHY_2M       BIT(1)
#define PHY_CODED    BIT(2)
#define PHY_FLAGS_S2 0
#define PHY_FLAGS_S8 BIT(0)

#if defined(CONFIG_BT_CTLR_PHY_CODED)
#define CODED_PHY_PREAMBLE_TIME_US       80
#define CODED_PHY_ACCESS_ADDRESS_TIME_US 256
#define CODED_PHY_CI_TIME_US             16
#define CODED_PHY_TERM1_TIME_US          24
#define CODED_PHY_CRC_SIZE               24
#define CODED_PHY_TERM2_SIZE             3

#define FEC_BLOCK1_US                    ((CODED_PHY_ACCESS_ADDRESS_TIME_US) + \
					  (CODED_PHY_CI_TIME_US) + \
					  (CODED_PHY_TERM1_TIME_US))

/* cs = 0, S2 coding scheme, use PHY_FLAGS_S2
 * cs = 1, S8 coding scheme, use PHY_FLAGS_S8
 *
 * Not using the term CI, Coding Indicator, where in the Spec its defined value
 * of 0 is S8 encoding, 1 is S2 encoding.
 */
#define FEC_BLOCK2_US(octets, mic, cs)   (((((PDU_HEADER_SIZE) + \
					     (octets) + \
					     (mic)) << 3) + \
					   (CODED_PHY_CRC_SIZE) + \
					   (CODED_PHY_TERM2_SIZE)) << \
					  (1 + (((cs) & 0x01) << 1)))

#define PDU_US(octets, mic, phy, cs)     (((phy) & PHY_CODED) ? \
					  ((CODED_PHY_PREAMBLE_TIME_US) + \
					   (FEC_BLOCK1_US) + \
					   FEC_BLOCK2_US((octets), (mic), \
							 (cs))) : \
					  (((PDU_PREAMBLE_SIZE(phy) + \
					     (PDU_ACCESS_ADDR_SIZE) + \
					     (PDU_HEADER_SIZE) + \
					     (octets) + \
					     (mic) + \
					     (PDU_CRC_SIZE)) << 3) / \
					   BIT(((phy) & 0x03) >> 1)))

#define PDU_MAX_US(octets, mic, phy)     PDU_US((octets), (mic), (phy), \
						PHY_FLAGS_S8)

#else /* !CONFIG_BT_CTLR_PHY_CODED */
#define PDU_US(octets, mic, phy, cs)     (((PDU_PREAMBLE_SIZE(phy) + \
					    (PDU_ACCESS_ADDR_SIZE) + \
					    (PDU_HEADER_SIZE) + \
					    (octets) + \
					    (mic) + \
					    (PDU_CRC_SIZE)) << 3) / \
					  BIT(((phy) & 0x03) >> 1))

#define PDU_MAX_US(octets, mic, phy)     PDU_US((octets), (mic), (phy), 0)
#endif /* !CONFIG_BT_CTLR_PHY_CODED */

#define PDU_DC_MAX_US(octets, phy)   PDU_MAX_US((octets), (PDU_MIC_SIZE), (phy))

#define PDU_DC_US(octets, mic, phy, cs)  PDU_US((octets), (mic), (phy), (cs))

#define PDU_AC_MAX_US(octets, phy)   PDU_MAX_US((octets), 0, (phy))

#define PDU_AC_US(octets, phy, cs)   PDU_US((octets), 0, (phy), (cs))

#define PDU_BIS_MAX_US(octets, enc, phy) PDU_MAX_US((octets), \
						    ((enc) ? \
						     (PDU_MIC_SIZE) : 0), \
						    (phy))

#define PDU_BIS_US(octets, enc, phy, s8) PDU_US((octets), \
						((enc) ? (PDU_MIC_SIZE) : 0), \
						(phy), (s8))

struct pdu_adv_adv_ind {
	uint8_t addr[BDADDR_SIZE];
	uint8_t data[PDU_AC_DATA_SIZE_MAX];
} __packed;

struct pdu_adv_direct_ind {
	uint8_t adv_addr[BDADDR_SIZE];
	uint8_t tgt_addr[BDADDR_SIZE];
} __packed;

struct pdu_adv_scan_rsp {
	uint8_t addr[BDADDR_SIZE];
	uint8_t data[PDU_AC_DATA_SIZE_MAX];
} __packed;

struct pdu_adv_scan_req {
	uint8_t scan_addr[BDADDR_SIZE];
	uint8_t adv_addr[BDADDR_SIZE];
} __packed;

struct pdu_adv_connect_ind {
	uint8_t init_addr[BDADDR_SIZE];
	uint8_t adv_addr[BDADDR_SIZE];
	struct {
		uint8_t  access_addr[4];
		uint8_t  crc_init[3];
		uint8_t  win_size;
		uint16_t win_offset;
		uint16_t interval;
		uint16_t latency;
		uint16_t timeout;
		uint8_t  chan_map[PDU_CHANNEL_MAP_SIZE];
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
		uint8_t  hop:5;
		uint8_t  sca:3;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
		uint8_t  sca:3;
		uint8_t  hop:5;
#else
#error "Unsupported endianness"
#endif

	} __packed;
} __packed;

struct pdu_adv_ext_hdr {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t adv_addr:1;
	uint8_t tgt_addr:1;
	uint8_t cte_info:1;
	uint8_t adi:1;
	uint8_t aux_ptr:1;
	uint8_t sync_info:1;
	uint8_t tx_pwr:1;
	uint8_t rfu:1;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint8_t rfu:1;
	uint8_t tx_pwr:1;
	uint8_t sync_info:1;
	uint8_t aux_ptr:1;
	uint8_t adi:1;
	uint8_t cte_info:1;
	uint8_t tgt_addr:1;
	uint8_t adv_addr:1;
#else
#error "Unsupported endianness"
#endif
	uint8_t data[0];
} __packed;

struct pdu_adv_com_ext_adv {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t ext_hdr_len:6;
	uint8_t adv_mode:2;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint8_t adv_mode:2;
	uint8_t ext_hdr_len:6;
#else
#error "Unsupported endianness"
#endif
	union {
		struct pdu_adv_ext_hdr ext_hdr;
		uint8_t ext_hdr_adv_data[0];
	};
} __packed;

enum pdu_adv_mode {
	EXT_ADV_MODE_NON_CONN_NON_SCAN = 0x00,
	EXT_ADV_MODE_CONN_NON_SCAN = 0x01,
	EXT_ADV_MODE_NON_CONN_SCAN = 0x02,
};

#define PDU_ADV_SID_COUNT 16

struct pdu_adv_adi {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint16_t did:12;
	uint16_t sid:4;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint16_t sid:4;
	uint16_t did:12;
#else
#error "Unsupported endianness"
#endif
} __packed;

struct pdu_adv_aux_ptr {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t  chan_idx:6;
	uint8_t  ca:1;
	uint8_t  offs_units:1;
	uint16_t offs:13;
	uint16_t phy:3;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint8_t  offs_units:1;
	uint8_t  ca:1;
	uint8_t  chan_idx:6;
	uint16_t phy:3;
	uint16_t offs:13;
#else
#error "Unsupported endianness"
#endif
} __packed;

enum pdu_adv_aux_ptr_ca {
	EXT_ADV_AUX_PTR_CA_500_PPM = 0x00,
	EXT_ADV_AUX_PTR_CA_50_PPM  = 0x01,
};

enum pdu_adv_offs_units {
	EXT_ADV_AUX_PTR_OFFS_UNITS_30  = 0x00,
	EXT_ADV_AUX_PTR_OFFS_UNITS_300 = 0x01,
};

enum pdu_adv_aux_phy {
	EXT_ADV_AUX_PHY_LE_1M    = 0x00,
	EXT_ADV_AUX_PHY_LE_2M    = 0x01,
	EXT_ADV_AUX_PHY_LE_CODED = 0x02,
};

struct pdu_cte_info {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t  time:5;
	uint8_t  rfu:1;
	uint8_t  type:2;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint8_t  type:2;
	uint8_t  rfu:1;
	uint8_t  time:5;
#else
#error "Unsupported endianness"
#endif
} __packed;

struct pdu_adv_sync_info {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint16_t offs:13;
	uint16_t offs_units:1;
	uint16_t offs_adjust:1;
	uint16_t rfu:1;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint16_t rfu:1;
	uint16_t offs_adjust:1;
	uint16_t offs_units:1;
	uint16_t offs:13;
#else
#error "Unsupported endianness"
#endif
	uint16_t interval;
	uint8_t  sca_chm[PDU_CHANNEL_MAP_SIZE];
	uint32_t aa;
	uint8_t  crc_init[3];
	uint16_t evt_cntr;
} __packed;

#define PDU_SYNC_INFO_SCA_CHM_SCA_BYTE_OFFSET 4
#define PDU_SYNC_INFO_SCA_CHM_SCA_BIT_POS     5
#define PDU_SYNC_INFO_SCA_CHM_SCA_BIT_MASK    \
		(0x07 << (PDU_SYNC_INFO_SCA_CHM_SCA_BIT_POS))

struct pdu_adv_sync_chm_upd_ind {
	uint8_t  chm[PDU_CHANNEL_MAP_SIZE];
	uint16_t instant;
} __packed;

enum pdu_adv_type {
	PDU_ADV_TYPE_ADV_IND = 0x00,
	PDU_ADV_TYPE_DIRECT_IND = 0x01,
	PDU_ADV_TYPE_NONCONN_IND = 0x02,
	PDU_ADV_TYPE_SCAN_REQ = 0x03,
	PDU_ADV_TYPE_AUX_SCAN_REQ = PDU_ADV_TYPE_SCAN_REQ,
	PDU_ADV_TYPE_SCAN_RSP = 0x04,
	PDU_ADV_TYPE_ADV_IND_SCAN_RSP = 0x05,
	PDU_ADV_TYPE_CONNECT_IND = 0x05,
	PDU_ADV_TYPE_AUX_CONNECT_REQ = PDU_ADV_TYPE_CONNECT_IND,
	PDU_ADV_TYPE_SCAN_IND = 0x06,
	PDU_ADV_TYPE_EXT_IND = 0x07,
	PDU_ADV_TYPE_AUX_ADV_IND = PDU_ADV_TYPE_EXT_IND,
	PDU_ADV_TYPE_AUX_SCAN_RSP = PDU_ADV_TYPE_EXT_IND,
	PDU_ADV_TYPE_AUX_SYNC_IND = PDU_ADV_TYPE_EXT_IND,
	PDU_ADV_TYPE_AUX_CHAIN_IND = PDU_ADV_TYPE_EXT_IND,
	PDU_ADV_TYPE_AUX_CONNECT_RSP = 0x08,
} __packed;

struct pdu_adv {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t type:4;
	uint8_t rfu:1;
	uint8_t chan_sel:1;
	uint8_t tx_addr:1;
	uint8_t rx_addr:1;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint8_t rx_addr:1;
	uint8_t tx_addr:1;
	uint8_t chan_sel:1;
	uint8_t rfu:1;
	uint8_t type:4;
#else
#error "Unsupported endianness"
#endif

	uint8_t len;

	union {
		uint8_t   payload[0];
		struct pdu_adv_adv_ind adv_ind;
		struct pdu_adv_direct_ind direct_ind;
		struct pdu_adv_scan_req scan_req;
		struct pdu_adv_scan_rsp scan_rsp;
		struct pdu_adv_connect_ind connect_ind;

#if defined(CONFIG_BT_CTLR_ADV_EXT)
		struct pdu_adv_com_ext_adv adv_ext_ind;
#endif /* CONFIG_BT_CTLR_ADV_EXT */
	} __packed;
} __packed;

enum pdu_data_llid {
	PDU_DATA_LLID_RESV = 0x00,
	PDU_DATA_LLID_DATA_CONTINUE = 0x01,
	PDU_DATA_LLID_DATA_START = 0x02,
	PDU_DATA_LLID_CTRL = 0x03,
};

enum pdu_data_llctrl_type {
	PDU_DATA_LLCTRL_TYPE_CONN_UPDATE_IND = 0x00,
	PDU_DATA_LLCTRL_TYPE_CHAN_MAP_IND = 0x01,
	PDU_DATA_LLCTRL_TYPE_TERMINATE_IND = 0x02,
	PDU_DATA_LLCTRL_TYPE_ENC_REQ = 0x03,
	PDU_DATA_LLCTRL_TYPE_ENC_RSP = 0x04,
	PDU_DATA_LLCTRL_TYPE_START_ENC_REQ = 0x05,
	PDU_DATA_LLCTRL_TYPE_START_ENC_RSP = 0x06,
	PDU_DATA_LLCTRL_TYPE_UNKNOWN_RSP = 0x07,
	PDU_DATA_LLCTRL_TYPE_FEATURE_REQ = 0x08,
	PDU_DATA_LLCTRL_TYPE_FEATURE_RSP = 0x09,
	PDU_DATA_LLCTRL_TYPE_PAUSE_ENC_REQ = 0x0A,
	PDU_DATA_LLCTRL_TYPE_PAUSE_ENC_RSP = 0x0B,
	PDU_DATA_LLCTRL_TYPE_VERSION_IND = 0x0C,
	PDU_DATA_LLCTRL_TYPE_REJECT_IND = 0x0D,
	PDU_DATA_LLCTRL_TYPE_PER_INIT_FEAT_XCHG = 0x0E,
	PDU_DATA_LLCTRL_TYPE_CONN_PARAM_REQ = 0x0F,
	PDU_DATA_LLCTRL_TYPE_CONN_PARAM_RSP = 0x10,
	PDU_DATA_LLCTRL_TYPE_REJECT_EXT_IND = 0x11,
	PDU_DATA_LLCTRL_TYPE_PING_REQ = 0x12,
	PDU_DATA_LLCTRL_TYPE_PING_RSP = 0x13,
	PDU_DATA_LLCTRL_TYPE_LENGTH_REQ = 0x14,
	PDU_DATA_LLCTRL_TYPE_LENGTH_RSP = 0x15,
	PDU_DATA_LLCTRL_TYPE_PHY_REQ = 0x16,
	PDU_DATA_LLCTRL_TYPE_PHY_RSP = 0x17,
	PDU_DATA_LLCTRL_TYPE_PHY_UPD_IND = 0x18,
	PDU_DATA_LLCTRL_TYPE_MIN_USED_CHAN_IND = 0x19,
	PDU_DATA_LLCTRL_TYPE_CTE_REQ = 0x1A,
	PDU_DATA_LLCTRL_TYPE_CTE_RSP = 0x1B,
	PDU_DATA_LLCTRL_TYPE_CIS_REQ = 0x1F,
	PDU_DATA_LLCTRL_TYPE_CIS_RSP = 0x20,
	PDU_DATA_LLCTRL_TYPE_CIS_IND = 0x21,
	PDU_DATA_LLCTRL_TYPE_CIS_TERMINATE_IND = 0x22,
	PDU_DATA_LLCTRL_TYPE_UNUSED = 0xFF
};

struct pdu_data_llctrl_conn_update_ind {
	uint8_t  win_size;
	uint16_t win_offset;
	uint16_t interval;
	uint16_t latency;
	uint16_t timeout;
	uint16_t instant;
} __packed;

struct pdu_data_llctrl_chan_map_ind {
	uint8_t  chm[PDU_CHANNEL_MAP_SIZE];
	uint16_t instant;
} __packed;

struct pdu_data_llctrl_terminate_ind {
	uint8_t error_code;
} __packed;

struct pdu_data_llctrl_enc_req {
	uint8_t rand[8];
	uint8_t ediv[2];
	uint8_t skdm[8];
	uint8_t ivm[4];
} __packed;

struct pdu_data_llctrl_enc_rsp {
	uint8_t skds[8];
	uint8_t ivs[4];
} __packed;

struct pdu_data_llctrl_start_enc_req {
	/* no members */
} __packed;

struct pdu_data_llctrl_start_enc_rsp {
	/* no members */
} __packed;

struct pdu_data_llctrl_unknown_rsp {
	uint8_t type;
} __packed;

struct pdu_data_llctrl_feature_req {
	uint8_t features[8];
} __packed;

struct pdu_data_llctrl_feature_rsp {
	uint8_t features[8];
} __packed;

struct pdu_data_llctrl_pause_enc_req {
	/* no members */
} __packed;

struct pdu_data_llctrl_pause_enc_rsp {
	/* no members */
} __packed;

struct pdu_data_llctrl_version_ind {
	uint8_t  version_number;
	uint16_t company_id;
	uint16_t sub_version_number;
} __packed;

struct pdu_data_llctrl_reject_ind {
	uint8_t error_code;
} __packed;

struct pdu_data_llctrl_per_init_feat_xchg {
	uint8_t features[8];
} __packed;

struct pdu_data_llctrl_conn_param_req {
	uint16_t interval_min;
	uint16_t interval_max;
	uint16_t latency;
	uint16_t timeout;
	uint8_t  preferred_periodicity;
	uint16_t reference_conn_event_count;
	uint16_t offset0;
	uint16_t offset1;
	uint16_t offset2;
	uint16_t offset3;
	uint16_t offset4;
	uint16_t offset5;
} __packed;

struct pdu_data_llctrl_conn_param_rsp {
	uint16_t interval_min;
	uint16_t interval_max;
	uint16_t latency;
	uint16_t timeout;
	uint8_t  preferred_periodicity;
	uint16_t reference_conn_event_count;
	uint16_t offset0;
	uint16_t offset1;
	uint16_t offset2;
	uint16_t offset3;
	uint16_t offset4;
	uint16_t offset5;
} __packed;

struct pdu_data_llctrl_reject_ext_ind {
	uint8_t reject_opcode;
	uint8_t error_code;
} __packed;

struct pdu_data_llctrl_ping_req {
	/* no members */
} __packed;

struct pdu_data_llctrl_ping_rsp {
	/* no members */
} __packed;

struct pdu_data_llctrl_length_req {
	uint16_t max_rx_octets;
	uint16_t max_rx_time;
	uint16_t max_tx_octets;
	uint16_t max_tx_time;
} __packed;

struct pdu_data_llctrl_length_rsp {
	uint16_t max_rx_octets;
	uint16_t max_rx_time;
	uint16_t max_tx_octets;
	uint16_t max_tx_time;
} __packed;

struct pdu_data_llctrl_phy_req {
	uint8_t tx_phys;
	uint8_t rx_phys;
} __packed;

struct pdu_data_llctrl_phy_rsp {
	uint8_t tx_phys;
	uint8_t rx_phys;
} __packed;

struct pdu_data_llctrl_phy_upd_ind {
	uint8_t  c_to_p_phy;
	uint8_t  p_to_c_phy;
	uint16_t instant;
} __packed;

struct pdu_data_llctrl_min_used_chans_ind {
	uint8_t phys;
	uint8_t min_used_chans;
} __packed;

struct pdu_data_llctrl_cte_req {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t min_cte_len_req : 5;
	uint8_t rfu : 1;
	uint8_t cte_type_req : 2;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint8_t cte_type_req : 2;
	uint8_t rfu : 1;
	uint8_t min_cte_len_req : 5;
#else
#error "Unsupported endianness"
#endif
} __packed;

struct pdu_data_llctrl_cte_rsp {
	/* no members */
} __packed;

struct pdu_data_llctrl_cis_req {
	uint8_t  cig_id;
	uint8_t  cis_id;
	uint8_t  c_phy;
	uint8_t  p_phy;
	/* c_max_sdu:12
	 * rfu:3
	 * framed:1
	 * NOTE: This layout as bitfields is not portable for BE using
	 * endianness conversion macros.
	 */
	uint8_t  c_max_sdu_packed[2];
	/* p_max_sdu:12
	 * rfu:4
	 * NOTE: This layout as bitfields is not portable for BE using
	 * endianness conversion macros.
	 */
	uint8_t  p_max_sdu[2];
	uint8_t  c_sdu_interval[3];
	uint8_t  p_sdu_interval[3];
	uint16_t c_max_pdu;
	uint16_t p_max_pdu;
	uint8_t  nse;
	uint8_t  sub_interval[3];
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t  c_bn:4;
	uint8_t  p_bn:4;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint8_t  p_bn:4;
	uint8_t  c_bn:4;
#else
#error "Unsupported endianness"
#endif
	uint8_t  c_ft;
	uint8_t  p_ft;
	uint16_t iso_interval;
	uint8_t  cis_offset_min[3];
	uint8_t  cis_offset_max[3];
	uint16_t conn_event_count;
} __packed;

struct pdu_data_llctrl_cis_rsp {
	uint8_t  cis_offset_min[3];
	uint8_t  cis_offset_max[3];
	uint16_t conn_event_count;
} __packed;

struct pdu_data_llctrl_cis_ind {
	uint8_t  aa[4];
	uint8_t  cis_offset[3];
	uint8_t  cig_sync_delay[3];
	uint8_t  cis_sync_delay[3];
	uint16_t conn_event_count;
} __packed;

struct pdu_data_llctrl_cis_terminate_ind {
	uint8_t  cig_id;
	uint8_t  cis_id;
	uint8_t  error_code;
} __packed;

struct pdu_data_llctrl {
	uint8_t opcode;
	union {
		struct pdu_data_llctrl_conn_update_ind conn_update_ind;
		struct pdu_data_llctrl_chan_map_ind chan_map_ind;
		struct pdu_data_llctrl_terminate_ind terminate_ind;
		struct pdu_data_llctrl_enc_req enc_req;
		struct pdu_data_llctrl_enc_rsp enc_rsp;
		struct pdu_data_llctrl_start_enc_req start_enc_req;
		struct pdu_data_llctrl_start_enc_rsp start_enc_rsp;
		struct pdu_data_llctrl_unknown_rsp unknown_rsp;
		struct pdu_data_llctrl_feature_req feature_req;
		struct pdu_data_llctrl_feature_rsp feature_rsp;
		struct pdu_data_llctrl_pause_enc_req pause_enc_req;
		struct pdu_data_llctrl_pause_enc_rsp pause_enc_rsp;
		struct pdu_data_llctrl_version_ind version_ind;
		struct pdu_data_llctrl_reject_ind reject_ind;
		struct pdu_data_llctrl_per_init_feat_xchg per_init_feat_xchg;
		struct pdu_data_llctrl_conn_param_req conn_param_req;
		struct pdu_data_llctrl_conn_param_rsp conn_param_rsp;
		struct pdu_data_llctrl_reject_ext_ind reject_ext_ind;
		struct pdu_data_llctrl_ping_req ping_req;
		struct pdu_data_llctrl_ping_rsp ping_rsp;
		struct pdu_data_llctrl_length_req length_req;
		struct pdu_data_llctrl_length_rsp length_rsp;
		struct pdu_data_llctrl_phy_req phy_req;
		struct pdu_data_llctrl_phy_rsp phy_rsp;
		struct pdu_data_llctrl_phy_upd_ind phy_upd_ind;
		struct pdu_data_llctrl_min_used_chans_ind min_used_chans_ind;
		struct pdu_data_llctrl_cte_req cte_req;
		struct pdu_data_llctrl_cte_rsp cte_rsp;
		struct pdu_data_llctrl_cis_req cis_req;
		struct pdu_data_llctrl_cis_rsp cis_rsp;
		struct pdu_data_llctrl_cis_ind cis_ind;
		struct pdu_data_llctrl_cis_terminate_ind cis_terminate_ind;
	} __packed;
} __packed;

#define PDU_DATA_LLCTRL_LEN(type) (offsetof(struct pdu_data_llctrl, type) + \
				   sizeof(struct pdu_data_llctrl_ ## type))

#if defined(CONFIG_BT_CTLR_PROFILE_ISR)
struct profile {
	uint8_t lcur;
	uint8_t lmin;
	uint8_t lmax;
	uint8_t cur;
	uint8_t min;
	uint8_t max;
	uint8_t radio;
	uint8_t lll;
	uint8_t ull_high;
	uint8_t ull_low;
} __packed;
#endif /* CONFIG_BT_CTLR_PROFILE_ISR */

struct pdu_data {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t ll_id:2;
	uint8_t nesn:1;
	uint8_t sn:1;
	uint8_t md:1;
#if defined(CONFIG_BT_CTLR_DF_CONN_CTE_TX) || defined(CONFIG_BT_CTLR_DF_CONN_CTE_RX)
	uint8_t cp:1;
	uint8_t rfu:2;
#else
	uint8_t rfu:3;
#endif
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#if defined(CONFIG_BT_CTLR_DF_CONN_CTE_TX) || defined(CONFIG_BT_CTLR_DF_CONN_CTE_RX)
	uint8_t rfu:2;
	uint8_t cp:1;
#else
	uint8_t rfu:3;
#endif
	uint8_t md:1;
	uint8_t sn:1;
	uint8_t nesn:1;
	uint8_t ll_id:2;
#else
#error "Unsupported endianness"
#endif

	uint8_t len;

#if !defined(CONFIG_SOC_OPENISA_RV32M1_RISCV32)
#if !defined(CONFIG_BT_CTLR_DATA_LENGTH_CLEAR)
	union {
		uint8_t resv; /* TODO: remove nRF specific code */
		struct pdu_cte_info cte_info; /* BT 5.1 Core spec. CTEInfo storage */
	};
#endif /* !CONFIG_BT_CTLR_DATA_LENGTH_CLEAR */
#endif /* !CONFIG_SOC_OPENISA_RV32M1_RISCV32 */

	union {
		struct pdu_data_llctrl llctrl;
		uint8_t                   lldata[0];

#if defined(CONFIG_BT_CTLR_CONN_RSSI)
		uint8_t                   rssi;
#endif /* CONFIG_BT_CTLR_CONN_RSSI */

#if defined(CONFIG_BT_CTLR_PROFILE_ISR)
		struct profile         profile;
#endif /* CONFIG_BT_CTLR_PROFILE_ISR */
	} __packed;
} __packed;

/* Generic ISO pdu, could be CIS or BIS
 * To be used when referring to component without knowing CIS or BIS type
 */
struct pdu_iso {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t ll_id:2;
	uint8_t hdr_other:6;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint8_t hdr_other:6;
	uint8_t ll_id:2;
#else
#error "Unsupported endianness"
#endif /* __BYTE_ORDER__ */
	uint8_t length;
	uint8_t payload[0];
} __packed;

/* ISO SDU segmentation header */
#define PDU_ISO_SEG_HDR_SIZE 2
#define PDU_ISO_SEG_TIMEOFFSET_SIZE 3

struct pdu_iso_sdu_sh {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t sc:1;
	uint8_t cmplt:1;
	uint8_t rfu:6;

	uint8_t length;
	/* Note, timeoffset only available in first segment of sdu */
	uint32_t timeoffset:24;
	uint32_t payload:8;

#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint8_t rfu:6;
	uint8_t cmplt:1;
	uint8_t sc:1;

	uint8_t length;
	/* Note, timeoffset only available in first segment of sdu */
	uint32_t payload:8;
	uint32_t timeoffset:24;
#else
#error "Unsupported endianness"
#endif /* __BYTE_ORDER__ */
} __packed;

enum pdu_cis_llid {
	/** Unframed complete or end fragment */
	PDU_CIS_LLID_COMPLETE_END = 0x00,
	/** Unframed start or continuation fragment */
	PDU_CIS_LLID_START_CONTINUE = 0x01,
	/** Framed; one or more segments of a SDU */
	PDU_CIS_LLID_FRAMED = 0x02
};

struct pdu_cis {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t ll_id:2;
	uint8_t nesn:1;
	uint8_t sn:1;
	uint8_t cie:1;
	uint8_t rfu0:1;
	uint8_t npi:1;
	uint8_t rfu1:1;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint8_t rfu1:1;
	uint8_t npi:1;
	uint8_t rfu0:1;
	uint8_t cie:1;
	uint8_t sn:1;
	uint8_t nesn:1;
	uint8_t ll_id:2;
#else
#error "Unsupported endianness"
#endif /* __BYTE_ORDER__ */
	uint8_t length;
	uint8_t payload[0];
} __packed;

enum pdu_big_ctrl_type {
	PDU_BIG_CTRL_TYPE_CHAN_MAP_IND = 0x00,
	PDU_BIG_CTRL_TYPE_TERM_IND = 0x01,
};

struct pdu_big_ctrl_chan_map_ind {
	uint8_t  chm[PDU_CHANNEL_MAP_SIZE];
	uint16_t instant;
} __packed;

struct pdu_big_ctrl_term_ind {
	uint8_t  reason;
	uint16_t instant;
} __packed;


struct pdu_big_ctrl {
	uint8_t opcode;
	union {
		uint8_t ctrl_data[0];
		struct pdu_big_ctrl_chan_map_ind chan_map_ind;
		struct pdu_big_ctrl_term_ind term_ind;
	} __packed;
} __packed;

enum pdu_bis_llid {
	/** Unframed complete or end fragment */
	PDU_BIS_LLID_COMPLETE_END = 0x00,
	/** Unframed start or continuation fragment */
	PDU_BIS_LLID_START_CONTINUE = 0x01,
	/** Framed; one or more segments of a SDU */
	PDU_BIS_LLID_FRAMED = 0x02,
	/** BIG Control PDU */
	PDU_BIS_LLID_CTRL = 0x03,
};

struct pdu_bis {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t ll_id:2;
	uint8_t cssn:3;
	uint8_t cstf:1;
	uint8_t rfu:2;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint8_t rfu:2;
	uint8_t cstf:1;
	uint8_t cssn:3;
	uint8_t ll_id:2;
#else
#error "Unsupported endianness"
#endif /* __BYTE_ORDER__ */
	uint8_t len;
	union {
		uint8_t payload[0];
		struct pdu_big_ctrl ctrl;
	} __packed;
} __packed;

struct pdu_big_info {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint32_t offs:14;
	uint32_t offs_units:1;
	uint32_t iso_interval:12;
	uint32_t num_bis:5;

	uint32_t nse:5;
	uint32_t bn:3;
	uint32_t sub_interval:20;
	uint32_t pto:4;

	uint32_t spacing:20;
	uint32_t irc:4;
	uint32_t max_pdu:8;

	uint8_t  rfu;

	uint32_t seed_access_addr;

	uint32_t sdu_interval:20;
	uint32_t max_sdu:12;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	uint32_t num_bis:5;
	uint32_t iso_interval:12;
	uint32_t offs_units:1;
	uint32_t offs:14;

	uint32_t pto:4;
	uint32_t sub_interval:20;
	uint32_t bn:3;
	uint32_t nse:5;

	uint32_t max_pdu:8;
	uint32_t irc:4;
	uint32_t spacing:20;

	uint8_t  rfu;

	uint32_t seed_access_addr;

	uint32_t max_sdu:12;
	uint32_t sdu_interval:20;
#else
#error "Unsupported endianness"
#endif /* __BYTE_ORDER__ */

	uint16_t base_crc_init;

	uint8_t chm_phy[PDU_CHANNEL_MAP_SIZE]; /* 37 bit chm; 3 bit phy */
	uint8_t payload_count_framing[5]; /* 39 bit count; 1 bit framing */

	uint8_t giv[8]; /* encryption required */
	uint8_t gskd[16]; /* encryption required */
} __packed;
#define PDU_BIG_INFO_CLEARTEXT_SIZE offsetof(struct pdu_big_info, giv)
#define PDU_BIG_INFO_ENCRYPTED_SIZE sizeof(struct pdu_big_info)
#define PDU_BIG_BN_MAX              0x07
#define PDU_BIG_PAYLOAD_COUNT_MAX   28

struct pdu_dtm {
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	uint8_t type:4;
	uint8_t rfu0:1;
#if defined(CONFIG_BT_CTLR_DF_CTE_TX)
	uint8_t cp:1;
	uint8_t rfu1:2;
#else
	uint8_t rfu1:3;
#endif
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#if defined(CONFIG_BT_CTLR_DF_CTE_TX)
	uint8_t rfu1:2;
	uint8_t cp:1;
#else
	uint8_t rfu1:3;
#endif
	uint8_t rfu0:1;
	uint8_t type:4;
#else
#error "Unsupported endianness"
#endif
	uint8_t length;
#if defined(CONFIG_BT_CTLR_DF_CTE_TX)
	union {
		uint8_t resv; /* TODO: remove nRF specific code */
		struct pdu_cte_info cte_info; /* BT 5.1 Core spec. CTEInfo storage */
	};
#endif
	uint8_t payload[0];
} __packed;

/* Direct Test Mode maximum payload size */
#define PDU_DTM_PAYLOAD_SIZE_MAX 255