/*
 * Copyright (c) 2005-2011 Atheros Communications Inc.
 * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _HTT_H_
#define _HTT_H_

#include <linux/bug.h>
#include <linux/interrupt.h>
#include <linux/dmapool.h>
#include <linux/hashtable.h>
#include <net/mac80211.h>

#include "htc.h"
#include "rx_desc.h"

enum htt_dbg_stats_type {
        HTT_DBG_STATS_WAL_PDEV_TXRX = 1 << 0,
        HTT_DBG_STATS_RX_REORDER    = 1 << 1,
        HTT_DBG_STATS_RX_RATE_INFO  = 1 << 2,
        HTT_DBG_STATS_TX_PPDU_LOG   = 1 << 3,
        HTT_DBG_STATS_TX_RATE_INFO  = 1 << 4,
        /* bits 5-23 currently reserved */

        HTT_DBG_NUM_STATS /* keep this last */
};

enum htt_h2t_msg_type { /* host-to-target */
        HTT_H2T_MSG_TYPE_VERSION_REQ        = 0,
        HTT_H2T_MSG_TYPE_TX_FRM             = 1,
        HTT_H2T_MSG_TYPE_RX_RING_CFG        = 2,
        HTT_H2T_MSG_TYPE_STATS_REQ          = 3,
        HTT_H2T_MSG_TYPE_SYNC               = 4,
        HTT_H2T_MSG_TYPE_AGGR_CFG           = 5,
        HTT_H2T_MSG_TYPE_FRAG_DESC_BANK_CFG = 6,

        /* This command is used for sending management frames in HTT < 3.0.
         * HTT >= 3.0 uses TX_FRM for everything. */
        HTT_H2T_MSG_TYPE_MGMT_TX            = 7,

        HTT_H2T_NUM_MSGS /* keep this last */
};

struct htt_cmd_hdr {
        u8 msg_type;
} __packed;

struct htt_ver_req {
        u8 pad[sizeof(u32) - sizeof(struct htt_cmd_hdr)];
} __packed;

/*
 * HTT tx MSDU descriptor
 *
 * The HTT tx MSDU descriptor is created by the host HTT SW for each
 * tx MSDU.  The HTT tx MSDU descriptor contains the information that
 * the target firmware needs for the FW's tx processing, particularly
 * for creating the HW msdu descriptor.
 * The same HTT tx descriptor is used for HL and LL systems, though
 * a few fields within the tx descriptor are used only by LL or
 * only by HL.
 * The HTT tx descriptor is defined in two manners: by a struct with
 * bitfields, and by a series of [dword offset, bit mask, bit shift]
 * definitions.
 * The target should use the struct def, for simplicitly and clarity,
 * but the host shall use the bit-mast + bit-shift defs, to be endian-
 * neutral.  Specifically, the host shall use the get/set macros built
 * around the mask + shift defs.
 */
struct htt_data_tx_desc_frag {
        __le32 paddr;
        __le32 len;
} __packed;

enum htt_data_tx_desc_flags0 {
        HTT_DATA_TX_DESC_FLAGS0_MAC_HDR_PRESENT = 1 << 0,
        HTT_DATA_TX_DESC_FLAGS0_NO_AGGR         = 1 << 1,
        HTT_DATA_TX_DESC_FLAGS0_NO_ENCRYPT      = 1 << 2,
        HTT_DATA_TX_DESC_FLAGS0_NO_CLASSIFY     = 1 << 3,
        HTT_DATA_TX_DESC_FLAGS0_RSVD0           = 1 << 4
#define HTT_DATA_TX_DESC_FLAGS0_PKT_TYPE_MASK 0xE0
#define HTT_DATA_TX_DESC_FLAGS0_PKT_TYPE_LSB 5
};

enum htt_data_tx_desc_flags1 {
#define HTT_DATA_TX_DESC_FLAGS1_VDEV_ID_BITS 6
#define HTT_DATA_TX_DESC_FLAGS1_VDEV_ID_MASK 0x003F
#define HTT_DATA_TX_DESC_FLAGS1_VDEV_ID_LSB  0
#define HTT_DATA_TX_DESC_FLAGS1_EXT_TID_BITS 5
#define HTT_DATA_TX_DESC_FLAGS1_EXT_TID_MASK 0x07C0
#define HTT_DATA_TX_DESC_FLAGS1_EXT_TID_LSB  6
        HTT_DATA_TX_DESC_FLAGS1_POSTPONED        = 1 << 11,
        HTT_DATA_TX_DESC_FLAGS1_MORE_IN_BATCH    = 1 << 12,
        HTT_DATA_TX_DESC_FLAGS1_CKSUM_L3_OFFLOAD = 1 << 13,
        HTT_DATA_TX_DESC_FLAGS1_CKSUM_L4_OFFLOAD = 1 << 14,
        HTT_DATA_TX_DESC_FLAGS1_RSVD1            = 1 << 15
};

enum htt_data_tx_ext_tid {
        HTT_DATA_TX_EXT_TID_NON_QOS_MCAST_BCAST = 16,
        HTT_DATA_TX_EXT_TID_MGMT                = 17,
        HTT_DATA_TX_EXT_TID_INVALID             = 31
};

#define HTT_INVALID_PEERID 0xFFFF

/*
 * htt_data_tx_desc - used for data tx path
 *
 * Note: vdev_id irrelevant for pkt_type == raw and no_classify == 1.
 *       ext_tid: for qos-data frames (0-15), see %HTT_DATA_TX_EXT_TID_
 *                for special kinds of tids
 *       postponed: only for HL hosts. indicates if this is a resend
 *                  (HL hosts manage queues on the host )
 *       more_in_batch: only for HL hosts. indicates if more packets are
 *                      pending. this allows target to wait and aggregate
 *       freq: 0 means home channel of given vdev. intended for offchannel
 */
struct htt_data_tx_desc {
        u8 flags0; /* %HTT_DATA_TX_DESC_FLAGS0_ */
        __le16 flags1; /* %HTT_DATA_TX_DESC_FLAGS1_ */
        __le16 len;
        __le16 id;
        __le32 frags_paddr;
        __le16 peerid;
        __le16 freq;
        u8 prefetch[0]; /* start of frame, for FW classification engine */
} __packed;

enum htt_rx_ring_flags {
        HTT_RX_RING_FLAGS_MAC80211_HDR = 1 << 0,
        HTT_RX_RING_FLAGS_MSDU_PAYLOAD = 1 << 1,
        HTT_RX_RING_FLAGS_PPDU_START   = 1 << 2,
        HTT_RX_RING_FLAGS_PPDU_END     = 1 << 3,
        HTT_RX_RING_FLAGS_MPDU_START   = 1 << 4,
        HTT_RX_RING_FLAGS_MPDU_END     = 1 << 5,
        HTT_RX_RING_FLAGS_MSDU_START   = 1 << 6,
        HTT_RX_RING_FLAGS_MSDU_END     = 1 << 7,
        HTT_RX_RING_FLAGS_RX_ATTENTION = 1 << 8,
        HTT_RX_RING_FLAGS_FRAG_INFO    = 1 << 9,
        HTT_RX_RING_FLAGS_UNICAST_RX   = 1 << 10,
        HTT_RX_RING_FLAGS_MULTICAST_RX = 1 << 11,
        HTT_RX_RING_FLAGS_CTRL_RX      = 1 << 12,
        HTT_RX_RING_FLAGS_MGMT_RX      = 1 << 13,
        HTT_RX_RING_FLAGS_NULL_RX      = 1 << 14,
        HTT_RX_RING_FLAGS_PHY_DATA_RX  = 1 << 15
};

#define HTT_RX_RING_SIZE_MIN 128
#define HTT_RX_RING_SIZE_MAX 2048

struct htt_rx_ring_setup_ring {
        __le32 fw_idx_shadow_reg_paddr;
        __le32 rx_ring_base_paddr;
        __le16 rx_ring_len; /* in 4-byte words */
        __le16 rx_ring_bufsize; /* rx skb size - in bytes */
        __le16 flags; /* %HTT_RX_RING_FLAGS_ */
        __le16 fw_idx_init_val;

        /* the following offsets are in 4-byte units */
        __le16 mac80211_hdr_offset;
        __le16 msdu_payload_offset;
        __le16 ppdu_start_offset;
        __le16 ppdu_end_offset;
        __le16 mpdu_start_offset;
        __le16 mpdu_end_offset;
        __le16 msdu_start_offset;
        __le16 msdu_end_offset;
        __le16 rx_attention_offset;
        __le16 frag_info_offset;
} __packed;

struct htt_rx_ring_setup_hdr {
        u8 num_rings; /* supported values: 1, 2 */
        __le16 rsvd0;
} __packed;

struct htt_rx_ring_setup {
        struct htt_rx_ring_setup_hdr hdr;
        struct htt_rx_ring_setup_ring rings[0];
} __packed;

/*
 * htt_stats_req - request target to send specified statistics
 *
 * @msg_type: hardcoded %HTT_H2T_MSG_TYPE_STATS_REQ
 * @upload_types: see %htt_dbg_stats_type. this is 24bit field actually
 *      so make sure its little-endian.
 * @reset_types: see %htt_dbg_stats_type. this is 24bit field actually
 *      so make sure its little-endian.
 * @cfg_val: stat_type specific configuration
 * @stat_type: see %htt_dbg_stats_type
 * @cookie_lsb: used for confirmation message from target->host
 * @cookie_msb: ditto as %cookie
 */
struct htt_stats_req {
        u8 upload_types[3];
        u8 rsvd0;
        u8 reset_types[3];
        struct {
                u8 mpdu_bytes;
                u8 mpdu_num_msdus;
                u8 msdu_bytes;
        } __packed;
        u8 stat_type;
        __le32 cookie_lsb;
        __le32 cookie_msb;
} __packed;

#define HTT_STATS_REQ_CFG_STAT_TYPE_INVALID 0xff

/*
 * htt_oob_sync_req - request out-of-band sync
 *
 * The HTT SYNC tells the target to suspend processing of subsequent
 * HTT host-to-target messages until some other target agent locally
 * informs the target HTT FW that the current sync counter is equal to
 * or greater than (in a modulo sense) the sync counter specified in
 * the SYNC message.
 *
 * This allows other host-target components to synchronize their operation
 * with HTT, e.g. to ensure that tx frames don't get transmitted until a
 * security key has been downloaded to and activated by the target.
 * In the absence of any explicit synchronization counter value
 * specification, the target HTT FW will use zero as the default current
 * sync value.
 *
 * The HTT target FW will suspend its host->target message processing as long
 * as 0 < (in-band sync counter - out-of-band sync counter) & 0xff < 128.
 */
struct htt_oob_sync_req {
        u8 sync_count;
        __le16 rsvd0;
} __packed;

struct htt_aggr_conf {
        u8 max_num_ampdu_subframes;
        /* amsdu_subframes is limited by 0x1F mask */
        u8 max_num_amsdu_subframes;
} __packed;

#define HTT_MGMT_FRM_HDR_DOWNLOAD_LEN 32

struct htt_mgmt_tx_desc {
        u8 pad[sizeof(u32) - sizeof(struct htt_cmd_hdr)];
        __le32 msdu_paddr;
        __le32 desc_id;
        __le32 len;
        __le32 vdev_id;
        u8 hdr[HTT_MGMT_FRM_HDR_DOWNLOAD_LEN];
} __packed;

enum htt_mgmt_tx_status {
        HTT_MGMT_TX_STATUS_OK    = 0,
        HTT_MGMT_TX_STATUS_RETRY = 1,
        HTT_MGMT_TX_STATUS_DROP  = 2
};

/*=== target -> host messages ===============================================*/

enum htt_t2h_msg_type {
        HTT_T2H_MSG_TYPE_VERSION_CONF           = 0x0,
        HTT_T2H_MSG_TYPE_RX_IND                 = 0x1,
        HTT_T2H_MSG_TYPE_RX_FLUSH               = 0x2,
        HTT_T2H_MSG_TYPE_PEER_MAP               = 0x3,
        HTT_T2H_MSG_TYPE_PEER_UNMAP             = 0x4,
        HTT_T2H_MSG_TYPE_RX_ADDBA               = 0x5,
        HTT_T2H_MSG_TYPE_RX_DELBA               = 0x6,
        HTT_T2H_MSG_TYPE_TX_COMPL_IND           = 0x7,
        HTT_T2H_MSG_TYPE_PKTLOG                 = 0x8,
        HTT_T2H_MSG_TYPE_STATS_CONF             = 0x9,
        HTT_T2H_MSG_TYPE_RX_FRAG_IND            = 0xa,
        HTT_T2H_MSG_TYPE_SEC_IND                = 0xb,
        HTT_T2H_MSG_TYPE_RC_UPDATE_IND          = 0xc,
        HTT_T2H_MSG_TYPE_TX_INSPECT_IND         = 0xd,
        HTT_T2H_MSG_TYPE_MGMT_TX_COMPLETION     = 0xe,
        HTT_T2H_MSG_TYPE_TX_CREDIT_UPDATE_IND   = 0xf,
        HTT_T2H_MSG_TYPE_RX_PN_IND              = 0x10,
        HTT_T2H_MSG_TYPE_RX_OFFLOAD_DELIVER_IND = 0x11,
        HTT_T2H_MSG_TYPE_RX_IN_ORD_PADDR_IND    = 0x12,
        /* 0x13 reservd */
        HTT_T2H_MSG_TYPE_WDI_IPA_OP_RESPONSE    = 0x14,

        /* FIXME: Do not depend on this event id. Numbering of this event id is
         * broken across different firmware revisions and HTT version fails to
         * indicate this.
         */
        HTT_T2H_MSG_TYPE_TEST,

        /* keep this last */
        HTT_T2H_NUM_MSGS
};

/*
 * htt_resp_hdr - header for target-to-host messages
 *
 * msg_type: see htt_t2h_msg_type
 */
struct htt_resp_hdr {
        u8 msg_type;
} __packed;

#define HTT_RESP_HDR_MSG_TYPE_OFFSET 0
#define HTT_RESP_HDR_MSG_TYPE_MASK   0xff
#define HTT_RESP_HDR_MSG_TYPE_LSB    0

/* htt_ver_resp - response sent for htt_ver_req */
struct htt_ver_resp {
        u8 minor;
        u8 major;
        u8 rsvd0;
} __packed;

struct htt_mgmt_tx_completion {
        u8 rsvd0;
        u8 rsvd1;
        u8 rsvd2;
        __le32 desc_id;
        __le32 status;
} __packed;

#define HTT_RX_INDICATION_INFO0_EXT_TID_MASK  (0x3F)
#define HTT_RX_INDICATION_INFO0_EXT_TID_LSB   (0)
#define HTT_RX_INDICATION_INFO0_FLUSH_VALID   (1 << 6)
#define HTT_RX_INDICATION_INFO0_RELEASE_VALID (1 << 7)

#define HTT_RX_INDICATION_INFO1_FLUSH_START_SEQNO_MASK   0x0000003F
#define HTT_RX_INDICATION_INFO1_FLUSH_START_SEQNO_LSB    0
#define HTT_RX_INDICATION_INFO1_FLUSH_END_SEQNO_MASK     0x00000FC0
#define HTT_RX_INDICATION_INFO1_FLUSH_END_SEQNO_LSB      6
#define HTT_RX_INDICATION_INFO1_RELEASE_START_SEQNO_MASK 0x0003F000
#define HTT_RX_INDICATION_INFO1_RELEASE_START_SEQNO_LSB  12
#define HTT_RX_INDICATION_INFO1_RELEASE_END_SEQNO_MASK   0x00FC0000
#define HTT_RX_INDICATION_INFO1_RELEASE_END_SEQNO_LSB    18
#define HTT_RX_INDICATION_INFO1_NUM_MPDU_RANGES_MASK     0xFF000000
#define HTT_RX_INDICATION_INFO1_NUM_MPDU_RANGES_LSB      24

struct htt_rx_indication_hdr {
        u8 info0; /* %HTT_RX_INDICATION_INFO0_ */
        __le16 peer_id;
        __le32 info1; /* %HTT_RX_INDICATION_INFO1_ */
} __packed;

#define HTT_RX_INDICATION_INFO0_PHY_ERR_VALID    (1 << 0)
#define HTT_RX_INDICATION_INFO0_LEGACY_RATE_MASK (0x1E)
#define HTT_RX_INDICATION_INFO0_LEGACY_RATE_LSB  (1)
#define HTT_RX_INDICATION_INFO0_LEGACY_RATE_CCK  (1 << 5)
#define HTT_RX_INDICATION_INFO0_END_VALID        (1 << 6)
#define HTT_RX_INDICATION_INFO0_START_VALID      (1 << 7)

#define HTT_RX_INDICATION_INFO1_VHT_SIG_A1_MASK    0x00FFFFFF
#define HTT_RX_INDICATION_INFO1_VHT_SIG_A1_LSB     0
#define HTT_RX_INDICATION_INFO1_PREAMBLE_TYPE_MASK 0xFF000000
#define HTT_RX_INDICATION_INFO1_PREAMBLE_TYPE_LSB  24

#define HTT_RX_INDICATION_INFO2_VHT_SIG_A1_MASK 0x00FFFFFF
#define HTT_RX_INDICATION_INFO2_VHT_SIG_A1_LSB  0
#define HTT_RX_INDICATION_INFO2_SERVICE_MASK    0xFF000000
#define HTT_RX_INDICATION_INFO2_SERVICE_LSB     24

enum htt_rx_legacy_rate {
        HTT_RX_OFDM_48 = 0,
        HTT_RX_OFDM_24 = 1,
        HTT_RX_OFDM_12,
        HTT_RX_OFDM_6,
        HTT_RX_OFDM_54,
        HTT_RX_OFDM_36,
        HTT_RX_OFDM_18,
        HTT_RX_OFDM_9,

        /* long preamble */
        HTT_RX_CCK_11_LP = 0,
        HTT_RX_CCK_5_5_LP = 1,
        HTT_RX_CCK_2_LP,
        HTT_RX_CCK_1_LP,
        /* short preamble */
        HTT_RX_CCK_11_SP,
        HTT_RX_CCK_5_5_SP,
        HTT_RX_CCK_2_SP
};

enum htt_rx_legacy_rate_type {
        HTT_RX_LEGACY_RATE_OFDM = 0,
        HTT_RX_LEGACY_RATE_CCK
};

enum htt_rx_preamble_type {
        HTT_RX_LEGACY        = 0x4,
        HTT_RX_HT            = 0x8,
        HTT_RX_HT_WITH_TXBF  = 0x9,
        HTT_RX_VHT           = 0xC,
        HTT_RX_VHT_WITH_TXBF = 0xD,
};

/*
 * Fields: phy_err_valid, phy_err_code, tsf,
 * usec_timestamp, sub_usec_timestamp
 * ..are valid only if end_valid == 1.
 *
 * Fields: rssi_chains, legacy_rate_type,
 * legacy_rate_cck, preamble_type, service,
 * vht_sig_*
 * ..are valid only if start_valid == 1;
 */
struct htt_rx_indication_ppdu {
        u8 combined_rssi;
        u8 sub_usec_timestamp;
        u8 phy_err_code;
        u8 info0; /* HTT_RX_INDICATION_INFO0_ */
        struct {
                u8 pri20_db;
                u8 ext20_db;
                u8 ext40_db;
                u8 ext80_db;
        } __packed rssi_chains[4];
        __le32 tsf;
        __le32 usec_timestamp;
        __le32 info1; /* HTT_RX_INDICATION_INFO1_ */
        __le32 info2; /* HTT_RX_INDICATION_INFO2_ */
} __packed;

enum htt_rx_mpdu_status {
        HTT_RX_IND_MPDU_STATUS_UNKNOWN = 0x0,
        HTT_RX_IND_MPDU_STATUS_OK,
        HTT_RX_IND_MPDU_STATUS_ERR_FCS,
        HTT_RX_IND_MPDU_STATUS_ERR_DUP,
        HTT_RX_IND_MPDU_STATUS_ERR_REPLAY,
        HTT_RX_IND_MPDU_STATUS_ERR_INV_PEER,
        /* only accept EAPOL frames */
        HTT_RX_IND_MPDU_STATUS_UNAUTH_PEER,
        HTT_RX_IND_MPDU_STATUS_OUT_OF_SYNC,
        /* Non-data in promiscous mode */
        HTT_RX_IND_MPDU_STATUS_MGMT_CTRL,
        HTT_RX_IND_MPDU_STATUS_TKIP_MIC_ERR,
        HTT_RX_IND_MPDU_STATUS_DECRYPT_ERR,
        HTT_RX_IND_MPDU_STATUS_MPDU_LENGTH_ERR,
        HTT_RX_IND_MPDU_STATUS_ENCRYPT_REQUIRED_ERR,
        HTT_RX_IND_MPDU_STATUS_PRIVACY_ERR,

        /*
         * MISC: discard for unspecified reasons.
         * Leave this enum value last.
         */
        HTT_RX_IND_MPDU_STATUS_ERR_MISC = 0xFF
};

struct htt_rx_indication_mpdu_range {
        u8 mpdu_count;
        u8 mpdu_range_status; /* %htt_rx_mpdu_status */
        u8 pad0;
        u8 pad1;
} __packed;

struct htt_rx_indication_prefix {
        __le16 fw_rx_desc_bytes;
        u8 pad0;
        u8 pad1;
};

struct htt_rx_indication {
        struct htt_rx_indication_hdr hdr;
        struct htt_rx_indication_ppdu ppdu;
        struct htt_rx_indication_prefix prefix;

        /*
         * the following fields are both dynamically sized, so
         * take care addressing them
         */

        /* the size of this is %fw_rx_desc_bytes */
        struct fw_rx_desc_base fw_desc;

        /*
         * %mpdu_ranges starts after &%prefix + roundup(%fw_rx_desc_bytes, 4)
         * and has %num_mpdu_ranges elements.
         */
        struct htt_rx_indication_mpdu_range mpdu_ranges[0];
} __packed;

static inline struct htt_rx_indication_mpdu_range *
                htt_rx_ind_get_mpdu_ranges(struct htt_rx_indication *rx_ind)
{
        void *ptr = rx_ind;

        ptr += sizeof(rx_ind->hdr)
             + sizeof(rx_ind->ppdu)
             + sizeof(rx_ind->prefix)
             + roundup(__le16_to_cpu(rx_ind->prefix.fw_rx_desc_bytes), 4);
        return ptr;
}

enum htt_rx_flush_mpdu_status {
        HTT_RX_FLUSH_MPDU_DISCARD = 0,
        HTT_RX_FLUSH_MPDU_REORDER = 1,
};

/*
 * htt_rx_flush - discard or reorder given range of mpdus
 *
 * Note: host must check if all sequence numbers between
 *      [seq_num_start, seq_num_end-1] are valid.
 */
struct htt_rx_flush {
        __le16 peer_id;
        u8 tid;
        u8 rsvd0;
        u8 mpdu_status; /* %htt_rx_flush_mpdu_status */
        u8 seq_num_start; /* it is 6 LSBs of 802.11 seq no */
        u8 seq_num_end; /* it is 6 LSBs of 802.11 seq no */
};

struct htt_rx_peer_map {
        u8 vdev_id;
        __le16 peer_id;
        u8 addr[6];
        u8 rsvd0;
        u8 rsvd1;
} __packed;

struct htt_rx_peer_unmap {
        u8 rsvd0;
        __le16 peer_id;
} __packed;

enum htt_security_types {
        HTT_SECURITY_NONE,
        HTT_SECURITY_WEP128,
        HTT_SECURITY_WEP104,
        HTT_SECURITY_WEP40,
        HTT_SECURITY_TKIP,
        HTT_SECURITY_TKIP_NOMIC,
        HTT_SECURITY_AES_CCMP,
        HTT_SECURITY_WAPI,

        HTT_NUM_SECURITY_TYPES /* keep this last! */
};

enum htt_security_flags {
#define HTT_SECURITY_TYPE_MASK 0x7F
#define HTT_SECURITY_TYPE_LSB  0
        HTT_SECURITY_IS_UNICAST = 1 << 7
};

struct htt_security_indication {
        union {
                /* dont use bitfields; undefined behaviour */
                u8 flags; /* %htt_security_flags */
                struct {
                        u8 security_type:7, /* %htt_security_types */
                           is_unicast:1;
                } __packed;
        } __packed;
        __le16 peer_id;
        u8 michael_key[8];
        u8 wapi_rsc[16];
} __packed;

#define HTT_RX_BA_INFO0_TID_MASK     0x000F
#define HTT_RX_BA_INFO0_TID_LSB      0
#define HTT_RX_BA_INFO0_PEER_ID_MASK 0xFFF0
#define HTT_RX_BA_INFO0_PEER_ID_LSB  4

struct htt_rx_addba {
        u8 window_size;
        __le16 info0; /* %HTT_RX_BA_INFO0_ */
} __packed;

struct htt_rx_delba {
        u8 rsvd0;
        __le16 info0; /* %HTT_RX_BA_INFO0_ */
} __packed;

enum htt_data_tx_status {
        HTT_DATA_TX_STATUS_OK            = 0,
        HTT_DATA_TX_STATUS_DISCARD       = 1,
        HTT_DATA_TX_STATUS_NO_ACK        = 2,
        HTT_DATA_TX_STATUS_POSTPONE      = 3, /* HL only */
        HTT_DATA_TX_STATUS_DOWNLOAD_FAIL = 128
};

enum htt_data_tx_flags {
#define HTT_DATA_TX_STATUS_MASK 0x07
#define HTT_DATA_TX_STATUS_LSB  0
#define HTT_DATA_TX_TID_MASK    0x78
#define HTT_DATA_TX_TID_LSB     3
        HTT_DATA_TX_TID_INVALID = 1 << 7
};

#define HTT_TX_COMPL_INV_MSDU_ID 0xFFFF

struct htt_data_tx_completion {
        union {
                u8 flags;
                struct {
                        u8 status:3,
                           tid:4,
                           tid_invalid:1;
                } __packed;
        } __packed;
        u8 num_msdus;
        u8 rsvd0;
        __le16 msdus[0]; /* variable length based on %num_msdus */
} __packed;

struct htt_tx_compl_ind_base {
        u32 hdr;
        u16 payload[1/*or more*/];
} __packed;

struct htt_rc_tx_done_params {
        u32 rate_code;
        u32 rate_code_flags;
        u32 flags;
        u32 num_enqued; /* 1 for non-AMPDU */
        u32 num_retries;
        u32 num_failed; /* for AMPDU */
        u32 ack_rssi;
        u32 time_stamp;
        u32 is_probe;
};

struct htt_rc_update {
        u8 vdev_id;
        __le16 peer_id;
        u8 addr[6];
        u8 num_elems;
        u8 rsvd0;
        struct htt_rc_tx_done_params params[0]; /* variable length %num_elems */
} __packed;

/* see htt_rx_indication for similar fields and descriptions */
struct htt_rx_fragment_indication {
        union {
                u8 info0; /* %HTT_RX_FRAG_IND_INFO0_ */
                struct {
                        u8 ext_tid:5,
                           flush_valid:1;
                } __packed;
        } __packed;
        __le16 peer_id;
        __le32 info1; /* %HTT_RX_FRAG_IND_INFO1_ */
        __le16 fw_rx_desc_bytes;
        __le16 rsvd0;

        u8 fw_msdu_rx_desc[0];
} __packed;

#define HTT_RX_FRAG_IND_INFO0_EXT_TID_MASK     0x1F
#define HTT_RX_FRAG_IND_INFO0_EXT_TID_LSB      0
#define HTT_RX_FRAG_IND_INFO0_FLUSH_VALID_MASK 0x20
#define HTT_RX_FRAG_IND_INFO0_FLUSH_VALID_LSB  5

#define HTT_RX_FRAG_IND_INFO1_FLUSH_SEQ_NUM_START_MASK 0x0000003F
#define HTT_RX_FRAG_IND_INFO1_FLUSH_SEQ_NUM_START_LSB  0
#define HTT_RX_FRAG_IND_INFO1_FLUSH_SEQ_NUM_END_MASK   0x00000FC0
#define HTT_RX_FRAG_IND_INFO1_FLUSH_SEQ_NUM_END_LSB    6

struct htt_rx_pn_ind {
        __le16 peer_id;
        u8 tid;
        u8 seqno_start;
        u8 seqno_end;
        u8 pn_ie_count;
        u8 reserved;
        u8 pn_ies[0];
} __packed;

struct htt_rx_offload_msdu {
        __le16 msdu_len;
        __le16 peer_id;
        u8 vdev_id;
        u8 tid;
        u8 fw_desc;
        u8 payload[0];
} __packed;

struct htt_rx_offload_ind {
        u8 reserved;
        __le16 msdu_count;
} __packed;

struct htt_rx_in_ord_msdu_desc {
        __le32 msdu_paddr;
        __le16 msdu_len;
        u8 fw_desc;
        u8 reserved;
} __packed;

struct htt_rx_in_ord_ind {
        u8 info;
        __le16 peer_id;
        u8 vdev_id;
        u8 reserved;
        __le16 msdu_count;
        struct htt_rx_in_ord_msdu_desc msdu_descs[0];
} __packed;

#define HTT_RX_IN_ORD_IND_INFO_TID_MASK         0x0000001f
#define HTT_RX_IN_ORD_IND_INFO_TID_LSB          0
#define HTT_RX_IN_ORD_IND_INFO_OFFLOAD_MASK     0x00000020
#define HTT_RX_IN_ORD_IND_INFO_OFFLOAD_LSB      5
#define HTT_RX_IN_ORD_IND_INFO_FRAG_MASK        0x00000040
#define HTT_RX_IN_ORD_IND_INFO_FRAG_LSB         6

/*
 * target -> host test message definition
 *
 * The following field definitions describe the format of the test
 * message sent from the target to the host.
 * The message consists of a 4-octet header, followed by a variable
 * number of 32-bit integer values, followed by a variable number
 * of 8-bit character values.
 *
 * |31                         16|15           8|7            0|
 * |-----------------------------------------------------------|
 * |          num chars          |   num ints   |   msg type   |
 * |-----------------------------------------------------------|
 * |                           int 0                           |
 * |-----------------------------------------------------------|
 * |                           int 1                           |
 * |-----------------------------------------------------------|
 * |                            ...                            |
 * |-----------------------------------------------------------|
 * |    char 3    |    char 2    |    char 1    |    char 0    |
 * |-----------------------------------------------------------|
 * |              |              |      ...     |    char 4    |
 * |-----------------------------------------------------------|
 *   - MSG_TYPE
 *     Bits 7:0
 *     Purpose: identifies this as a test message
 *     Value: HTT_MSG_TYPE_TEST
 *   - NUM_INTS
 *     Bits 15:8
 *     Purpose: indicate how many 32-bit integers follow the message header
 *   - NUM_CHARS
 *     Bits 31:16
 *     Purpose: indicate how many 8-bit charaters follow the series of integers
 */
struct htt_rx_test {
        u8 num_ints;
        __le16 num_chars;

        /* payload consists of 2 lists:
         *  a) num_ints * sizeof(__le32)
         *  b) num_chars * sizeof(u8) aligned to 4bytes */
        u8 payload[0];
} __packed;

static inline __le32 *htt_rx_test_get_ints(struct htt_rx_test *rx_test)
{
        return (__le32 *)rx_test->payload;
}

static inline u8 *htt_rx_test_get_chars(struct htt_rx_test *rx_test)
{
        return rx_test->payload + (rx_test->num_ints * sizeof(__le32));
}

/*
 * target -> host packet log message
 *
 * The following field definitions describe the format of the packet log
 * message sent from the target to the host.
 * The message consists of a 4-octet header,followed by a variable number
 * of 32-bit character values.
 *
 * |31          24|23          16|15           8|7            0|
 * |-----------------------------------------------------------|
 * |              |              |              |   msg type   |
 * |-----------------------------------------------------------|
 * |                        payload                            |
 * |-----------------------------------------------------------|
 *   - MSG_TYPE
 *     Bits 7:0
 *     Purpose: identifies this as a test message
 *     Value: HTT_MSG_TYPE_PACKETLOG
 */
struct htt_pktlog_msg {
        u8 pad[3];
        u8 payload[0];
} __packed;

struct htt_dbg_stats_rx_reorder_stats {
        /* Non QoS MPDUs received */
        __le32 deliver_non_qos;

        /* MPDUs received in-order */
        __le32 deliver_in_order;

        /* Flush due to reorder timer expired */
        __le32 deliver_flush_timeout;

        /* Flush due to move out of window */
        __le32 deliver_flush_oow;

        /* Flush due to DELBA */
        __le32 deliver_flush_delba;

        /* MPDUs dropped due to FCS error */
        __le32 fcs_error;

        /* MPDUs dropped due to monitor mode non-data packet */
        __le32 mgmt_ctrl;

        /* MPDUs dropped due to invalid peer */
        __le32 invalid_peer;

        /* MPDUs dropped due to duplication (non aggregation) */
        __le32 dup_non_aggr;

        /* MPDUs dropped due to processed before */
        __le32 dup_past;

        /* MPDUs dropped due to duplicate in reorder queue */
        __le32 dup_in_reorder;

        /* Reorder timeout happened */
        __le32 reorder_timeout;

        /* invalid bar ssn */
        __le32 invalid_bar_ssn;

        /* reorder reset due to bar ssn */
        __le32 ssn_reset;
};

struct htt_dbg_stats_wal_tx_stats {
        /* Num HTT cookies queued to dispatch list */
        __le32 comp_queued;

        /* Num HTT cookies dispatched */
        __le32 comp_delivered;

        /* Num MSDU queued to WAL */
        __le32 msdu_enqued;

        /* Num MPDU queue to WAL */
        __le32 mpdu_enqued;

        /* Num MSDUs dropped by WMM limit */
        __le32 wmm_drop;

        /* Num Local frames queued */
        __le32 local_enqued;

        /* Num Local frames done */
        __le32 local_freed;

        /* Num queued to HW */
        __le32 hw_queued;

        /* Num PPDU reaped from HW */
        __le32 hw_reaped;

        /* Num underruns */
        __le32 underrun;

        /* Num PPDUs cleaned up in TX abort */
        __le32 tx_abort;

        /* Num MPDUs requed by SW */
        __le32 mpdus_requed;

        /* excessive retries */
        __le32 tx_ko;

        /* data hw rate code */
        __le32 data_rc;

        /* Scheduler self triggers */
        __le32 self_triggers;

        /* frames dropped due to excessive sw retries */
        __le32 sw_retry_failure;

        /* illegal rate phy errors  */
        __le32 illgl_rate_phy_err;

        /* wal pdev continous xretry */
        __le32 pdev_cont_xretry;

        /* wal pdev continous xretry */
        __le32 pdev_tx_timeout;

        /* wal pdev resets  */
        __le32 pdev_resets;

        __le32 phy_underrun;

        /* MPDU is more than txop limit */
        __le32 txop_ovf;
} __packed;

struct htt_dbg_stats_wal_rx_stats {
        /* Cnts any change in ring routing mid-ppdu */
        __le32 mid_ppdu_route_change;

        /* Total number of statuses processed */
        __le32 status_rcvd;

        /* Extra frags on rings 0-3 */
        __le32 r0_frags;
        __le32 r1_frags;
        __le32 r2_frags;
        __le32 r3_frags;

        /* MSDUs / MPDUs delivered to HTT */
        __le32 htt_msdus;
        __le32 htt_mpdus;

        /* MSDUs / MPDUs delivered to local stack */
        __le32 loc_msdus;
        __le32 loc_mpdus;

        /* AMSDUs that have more MSDUs than the status ring size */
        __le32 oversize_amsdu;

        /* Number of PHY errors */
        __le32 phy_errs;

        /* Number of PHY errors drops */
        __le32 phy_err_drop;

        /* Number of mpdu errors - FCS, MIC, ENC etc. */
        __le32 mpdu_errs;
} __packed;

struct htt_dbg_stats_wal_peer_stats {
        __le32 dummy; /* REMOVE THIS ONCE REAL PEER STAT COUNTERS ARE ADDED */
} __packed;

struct htt_dbg_stats_wal_pdev_txrx {
        struct htt_dbg_stats_wal_tx_stats tx_stats;
        struct htt_dbg_stats_wal_rx_stats rx_stats;
        struct htt_dbg_stats_wal_peer_stats peer_stats;
} __packed;

struct htt_dbg_stats_rx_rate_info {
        __le32 mcs[10];
        __le32 sgi[10];
        __le32 nss[4];
        __le32 stbc[10];
        __le32 bw[3];
        __le32 pream[6];
        __le32 ldpc;
        __le32 txbf;
};

/*
 * htt_dbg_stats_status -
 * present -     The requested stats have been delivered in full.
 *               This indicates that either the stats information was contained
 *               in its entirety within this message, or else this message
 *               completes the delivery of the requested stats info that was
 *               partially delivered through earlier STATS_CONF messages.
 * partial -     The requested stats have been delivered in part.
 *               One or more subsequent STATS_CONF messages with the same
 *               cookie value will be sent to deliver the remainder of the
 *               information.
 * error -       The requested stats could not be delivered, for example due
 *               to a shortage of memory to construct a message holding the
 *               requested stats.
 * invalid -     The requested stat type is either not recognized, or the
 *               target is configured to not gather the stats type in question.
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 * series_done - This special value indicates that no further stats info
 *               elements are present within a series of stats info elems
 *               (within a stats upload confirmation message).
 */
enum htt_dbg_stats_status {
        HTT_DBG_STATS_STATUS_PRESENT     = 0,
        HTT_DBG_STATS_STATUS_PARTIAL     = 1,
        HTT_DBG_STATS_STATUS_ERROR       = 2,
        HTT_DBG_STATS_STATUS_INVALID     = 3,
        HTT_DBG_STATS_STATUS_SERIES_DONE = 7
};

/*
 * target -> host statistics upload
 *
 * The following field definitions describe the format of the HTT target
 * to host stats upload confirmation message.
 * The message contains a cookie echoed from the HTT host->target stats
 * upload request, which identifies which request the confirmation is
 * for, and a series of tag-length-value stats information elements.
 * The tag-length header for each stats info element also includes a
 * status field, to indicate whether the request for the stat type in

 * question was fully met, partially met, unable to be met, or invalid
 * (if the stat type in question is disabled in the target).
 * A special value of all 1's in this status field is used to indicate
 * the end of the series of stats info elements.
 *
 *
 * |31                         16|15           8|7   5|4       0|
 * |------------------------------------------------------------|
 * |                  reserved                  |    msg type   |
 * |------------------------------------------------------------|
 * |                        cookie LSBs                         |
 * |------------------------------------------------------------|
 * |                        cookie MSBs                         |
 * |------------------------------------------------------------|
 * |      stats entry length     |   reserved   |  S  |stat type|
 * |------------------------------------------------------------|
 * |                                                            |
 * |                  type-specific stats info                  |
 * |                                                            |
 * |------------------------------------------------------------|
 * |      stats entry length     |   reserved   |  S  |stat type|
 * |------------------------------------------------------------|
 * |                                                            |
 * |                  type-specific stats info                  |
 * |                                                            |
 * |------------------------------------------------------------|
 * |              n/a            |   reserved   | 111 |   n/a   |
 * |------------------------------------------------------------|
 * Header fields:
 *  - MSG_TYPE
 *    Bits 7:0
 *    Purpose: identifies this is a statistics upload confirmation message
 *    Value: 0x9
 *  - COOKIE_LSBS
 *    Bits 31:0
 *    Purpose: Provide a mechanism to match a target->host stats confirmation
 *        message with its preceding host->target stats request message.
 *    Value: LSBs of the opaque cookie specified by the host-side requestor
 *  - COOKIE_MSBS
 *    Bits 31:0
 *    Purpose: Provide a mechanism to match a target->host stats confirmation
 *        message with its preceding host->target stats request message.
 *    Value: MSBs of the opaque cookie specified by the host-side requestor
 *
 * Stats Information Element tag-length header fields:
 *  - STAT_TYPE
 *    Bits 4:0
 *    Purpose: identifies the type of statistics info held in the
 *        following information element
 *    Value: htt_dbg_stats_type
 *  - STATUS
 *    Bits 7:5
 *    Purpose: indicate whether the requested stats are present
 *    Value: htt_dbg_stats_status, including a special value (0x7) to mark
 *        the completion of the stats entry series
 *  - LENGTH
 *    Bits 31:16
 *    Purpose: indicate the stats information size
 *    Value: This field specifies the number of bytes of stats information
 *       that follows the element tag-length header.
 *       It is expected but not required that this length is a multiple of
 *       4 bytes.  Even if the length is not an integer multiple of 4, the
 *       subsequent stats entry header will begin on a 4-byte aligned
 *       boundary.
 */

#define HTT_STATS_CONF_ITEM_INFO_STAT_TYPE_MASK 0x1F
#define HTT_STATS_CONF_ITEM_INFO_STAT_TYPE_LSB  0
#define HTT_STATS_CONF_ITEM_INFO_STATUS_MASK    0xE0
#define HTT_STATS_CONF_ITEM_INFO_STATUS_LSB     5

struct htt_stats_conf_item {
        union {
                u8 info;
                struct {
                        u8 stat_type:5; /* %HTT_DBG_STATS_ */
                        u8 status:3; /* %HTT_DBG_STATS_STATUS_ */
                } __packed;
        } __packed;
        u8 pad;
        __le16 length;
        u8 payload[0]; /* roundup(length, 4) long */
} __packed;

struct htt_stats_conf {
        u8 pad[3];
        __le32 cookie_lsb;
        __le32 cookie_msb;

        /* each item has variable length! */
        struct htt_stats_conf_item items[0];
} __packed;

static inline struct htt_stats_conf_item *htt_stats_conf_next_item(
                                        const struct htt_stats_conf_item *item)
{
        return (void *)item + sizeof(*item) + roundup(item->length, 4);
}

/*
 * host -> target FRAG DESCRIPTOR/MSDU_EXT DESC bank
 *
 * The following field definitions describe the format of the HTT host
 * to target frag_desc/msdu_ext bank configuration message.
 * The message contains the based address and the min and max id of the
 * MSDU_EXT/FRAG_DESC that will be used by the HTT to map MSDU DESC and
 * MSDU_EXT/FRAG_DESC.
 * HTT will use id in HTT descriptor instead sending the frag_desc_ptr.
 * For QCA988X HW the firmware will use fragment_desc_ptr but in WIFI2.0
 * the hardware does the mapping/translation.
 *
 * Total banks that can be configured is configured to 16.
 *
 * This should be called before any TX has be initiated by the HTT
 *
 * |31                         16|15           8|7   5|4       0|
 * |------------------------------------------------------------|
 * | DESC_SIZE    |  NUM_BANKS   | RES |SWP|pdev|    msg type   |
 * |------------------------------------------------------------|
 * |                     BANK0_BASE_ADDRESS                     |
 * |------------------------------------------------------------|
 * |                            ...                             |
 * |------------------------------------------------------------|
 * |                    BANK15_BASE_ADDRESS                     |
 * |------------------------------------------------------------|
 * |       BANK0_MAX_ID          |       BANK0_MIN_ID           |
 * |------------------------------------------------------------|
 * |                            ...                             |
 * |------------------------------------------------------------|
 * |       BANK15_MAX_ID         |       BANK15_MIN_ID          |
 * |------------------------------------------------------------|
 * Header fields:
 *  - MSG_TYPE
 *    Bits 7:0
 *    Value: 0x6
 *  - BANKx_BASE_ADDRESS
 *    Bits 31:0
 *    Purpose: Provide a mechanism to specify the base address of the MSDU_EXT
 *         bank physical/bus address.
 *  - BANKx_MIN_ID
 *    Bits 15:0
 *    Purpose: Provide a mechanism to specify the min index that needs to
 *          mapped.
 *  - BANKx_MAX_ID
 *    Bits 31:16
 *    Purpose: Provide a mechanism to specify the max index that needs to
 *
 */
struct htt_frag_desc_bank_id {
        __le16 bank_min_id;
        __le16 bank_max_id;
} __packed;

/* real is 16 but it wouldn't fit in the max htt message size
 * so we use a conservatively safe value for now */
#define HTT_FRAG_DESC_BANK_MAX 4

#define HTT_FRAG_DESC_BANK_CFG_INFO_PDEV_ID_MASK 0x03
#define HTT_FRAG_DESC_BANK_CFG_INFO_PDEV_ID_LSB  0
#define HTT_FRAG_DESC_BANK_CFG_INFO_SWAP         (1 << 2)

struct htt_frag_desc_bank_cfg {
        u8 info; /* HTT_FRAG_DESC_BANK_CFG_INFO_ */
        u8 num_banks;
        u8 desc_size;
        __le32 bank_base_addrs[HTT_FRAG_DESC_BANK_MAX];
        struct htt_frag_desc_bank_id bank_id[HTT_FRAG_DESC_BANK_MAX];
} __packed;

union htt_rx_pn_t {
        /* WEP: 24-bit PN */
        u32 pn24;

        /* TKIP or CCMP: 48-bit PN */
        u_int64_t pn48;

        /* WAPI: 128-bit PN */
        u_int64_t pn128[2];
};

struct htt_cmd {
        struct htt_cmd_hdr hdr;
        union {
                struct htt_ver_req ver_req;
                struct htt_mgmt_tx_desc mgmt_tx;
                struct htt_data_tx_desc data_tx;
                struct htt_rx_ring_setup rx_setup;
                struct htt_stats_req stats_req;
                struct htt_oob_sync_req oob_sync_req;
                struct htt_aggr_conf aggr_conf;
                struct htt_frag_desc_bank_cfg frag_desc_bank_cfg;
        };
} __packed;

struct htt_resp {
        struct htt_resp_hdr hdr;
        union {
                struct htt_ver_resp ver_resp;
                struct htt_mgmt_tx_completion mgmt_tx_completion;
                struct htt_data_tx_completion data_tx_completion;
                struct htt_rx_indication rx_ind;
                struct htt_rx_fragment_indication rx_frag_ind;
                struct htt_rx_peer_map peer_map;
                struct htt_rx_peer_unmap peer_unmap;
                struct htt_rx_flush rx_flush;
                struct htt_rx_addba rx_addba;
                struct htt_rx_delba rx_delba;
                struct htt_security_indication security_indication;
                struct htt_rc_update rc_update;
                struct htt_rx_test rx_test;
                struct htt_pktlog_msg pktlog_msg;
                struct htt_stats_conf stats_conf;
                struct htt_rx_pn_ind rx_pn_ind;
                struct htt_rx_offload_ind rx_offload_ind;
                struct htt_rx_in_ord_ind rx_in_ord_ind;
        };
} __packed;

/*** host side structures follow ***/

struct htt_tx_done {
        u32 msdu_id;
        bool discard;
        bool no_ack;
};

struct htt_peer_map_event {
        u8 vdev_id;
        u16 peer_id;
        u8 addr[ETH_ALEN];
};

struct htt_peer_unmap_event {
        u16 peer_id;
};

struct ath10k_htt_txbuf {
        struct htt_data_tx_desc_frag frags[2];
        struct ath10k_htc_hdr htc_hdr;
        struct htt_cmd_hdr cmd_hdr;
        struct htt_data_tx_desc cmd_tx;
} __packed;

struct ath10k_htt {
        struct ath10k *ar;
        enum ath10k_htc_ep_id eid;

        u8 target_version_major;
        u8 target_version_minor;
        struct completion target_version_received;

        struct {
                /*
                 * Ring of network buffer objects - This ring is
                 * used exclusively by the host SW. This ring
                 * mirrors the dev_addrs_ring that is shared
                 * between the host SW and the MAC HW. The host SW
                 * uses this netbufs ring to locate the network
                 * buffer objects whose data buffers the HW has
                 * filled.
                 */
                struct sk_buff **netbufs_ring;

                /* This is used only with firmware supporting IN_ORD_IND.
                 *
                 * With Full Rx Reorder the HTT Rx Ring is more of a temporary
                 * buffer ring from which buffer addresses are copied by the
                 * firmware to MAC Rx ring. Firmware then delivers IN_ORD_IND
                 * pointing to specific (re-ordered) buffers.
                 *
                 * FIXME: With kernel generic hashing functions there's a lot
                 * of hash collisions for sk_buffs.
                 */
                bool in_ord_rx;
                DECLARE_HASHTABLE(skb_table, 4);

                /*
                 * Ring of buffer addresses -
                 * This ring holds the "physical" device address of the
                 * rx buffers the host SW provides for the MAC HW to
                 * fill.
                 */
                __le32 *paddrs_ring;

                /*
                 * Base address of ring, as a "physical" device address
                 * rather than a CPU address.
                 */
                dma_addr_t base_paddr;

                /* how many elems in the ring (power of 2) */
                int size;

                /* size - 1 */
                unsigned size_mask;

                /* how many rx buffers to keep in the ring */
                int fill_level;

                /* how many rx buffers (full+empty) are in the ring */
                int fill_cnt;

                /*
                 * alloc_idx - where HTT SW has deposited empty buffers
                 * This is allocated in consistent mem, so that the FW can
                 * read this variable, and program the HW's FW_IDX reg with
                 * the value of this shadow register.
                 */
                struct {
                        __le32 *vaddr;
                        dma_addr_t paddr;
                } alloc_idx;

                /* where HTT SW has processed bufs filled by rx MAC DMA */
                struct {
                        unsigned msdu_payld;
                } sw_rd_idx;

                /*
                 * refill_retry_timer - timer triggered when the ring is
                 * not refilled to the level expected
                 */
                struct timer_list refill_retry_timer;

                /* Protects access to all rx ring buffer state variables */
                spinlock_t lock;
        } rx_ring;

        unsigned int prefetch_len;

        /* Protects access to pending_tx, num_pending_tx */
        spinlock_t tx_lock;
        int max_num_pending_tx;
        int num_pending_tx;
        struct idr pending_tx;
        wait_queue_head_t empty_tx_wq;
        struct dma_pool *tx_pool;

        /* set if host-fw communication goes haywire
         * used to avoid further failures */
        bool rx_confused;
        struct tasklet_struct rx_replenish_task;

        /* This is used to group tx/rx completions separately and process them
         * in batches to reduce cache stalls */
        struct tasklet_struct txrx_compl_task;
        struct sk_buff_head tx_compl_q;
        struct sk_buff_head rx_compl_q;
        struct sk_buff_head rx_in_ord_compl_q;

        /* rx_status template */
        struct ieee80211_rx_status rx_status;
};

#define RX_HTT_HDR_STATUS_LEN 64

/* This structure layout is programmed via rx ring setup
 * so that FW knows how to transfer the rx descriptor to the host.
 * Buffers like this are placed on the rx ring. */
struct htt_rx_desc {
        union {
                /* This field is filled on the host using the msdu buffer
                 * from htt_rx_indication */
                struct fw_rx_desc_base fw_desc;
                u32 pad;
        } __packed;
        struct {
                struct rx_attention attention;
                struct rx_frag_info frag_info;
                struct rx_mpdu_start mpdu_start;
                struct rx_msdu_start msdu_start;
                struct rx_msdu_end msdu_end;
                struct rx_mpdu_end mpdu_end;
                struct rx_ppdu_start ppdu_start;
                struct rx_ppdu_end ppdu_end;
        } __packed;
        u8 rx_hdr_status[RX_HTT_HDR_STATUS_LEN];
        u8 msdu_payload[0];
};

#define HTT_RX_DESC_ALIGN 8

#define HTT_MAC_ADDR_LEN 6

/*
 * FIX THIS
 * Should be: sizeof(struct htt_host_rx_desc) + max rx MSDU size,
 * rounded up to a cache line size.
 */
#define HTT_RX_BUF_SIZE 1920
#define HTT_RX_MSDU_SIZE (HTT_RX_BUF_SIZE - (int)sizeof(struct htt_rx_desc))

/* Refill a bunch of RX buffers for each refill round so that FW/HW can handle
 * aggregated traffic more nicely. */
#define ATH10K_HTT_MAX_NUM_REFILL 16

/*
 * DMA_MAP expects the buffer to be an integral number of cache lines.
 * Rather than checking the actual cache line size, this code makes a
 * conservative estimate of what the cache line size could be.
 */
#define HTT_LOG2_MAX_CACHE_LINE_SIZE 7  /* 2^7 = 128 */
#define HTT_MAX_CACHE_LINE_SIZE_MASK ((1 << HTT_LOG2_MAX_CACHE_LINE_SIZE) - 1)

int ath10k_htt_connect(struct ath10k_htt *htt);
int ath10k_htt_init(struct ath10k *ar);
int ath10k_htt_setup(struct ath10k_htt *htt);

int ath10k_htt_tx_alloc(struct ath10k_htt *htt);
void ath10k_htt_tx_free(struct ath10k_htt *htt);

int ath10k_htt_rx_alloc(struct ath10k_htt *htt);
int ath10k_htt_rx_ring_refill(struct ath10k *ar);
void ath10k_htt_rx_free(struct ath10k_htt *htt);

void ath10k_htt_htc_tx_complete(struct ath10k *ar, struct sk_buff *skb);
void ath10k_htt_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb);
int ath10k_htt_h2t_ver_req_msg(struct ath10k_htt *htt);
int ath10k_htt_h2t_stats_req(struct ath10k_htt *htt, u8 mask, u64 cookie);
int ath10k_htt_send_rx_ring_cfg_ll(struct ath10k_htt *htt);
int ath10k_htt_h2t_aggr_cfg_msg(struct ath10k_htt *htt,
                                u8 max_subfrms_ampdu,
                                u8 max_subfrms_amsdu);

void __ath10k_htt_tx_dec_pending(struct ath10k_htt *htt);
int ath10k_htt_tx_alloc_msdu_id(struct ath10k_htt *htt, struct sk_buff *skb);
void ath10k_htt_tx_free_msdu_id(struct ath10k_htt *htt, u16 msdu_id);
int ath10k_htt_mgmt_tx(struct ath10k_htt *htt, struct sk_buff *);
int ath10k_htt_tx(struct ath10k_htt *htt, struct sk_buff *);

#endif