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linux_dsm_epyc7002/drivers/net/wireless/ath/ath10k/htt.h
Rajkumar Manoharan bfdd7937ab ath10k: add tracing for ath10k_htt_pktlog 
This is useful for collecting pktlog statistics of tx, rx
and rate information, so add tracing for the API call.

Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
2014-10-07 17:10:27 +03:00

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/*
* 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 <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
*/
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;
__le32 peerid;
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
};
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_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
/*
* 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;
};
} __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;
int max_throughput_mbps;
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;
/*
* 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, %used_msdu_ids */
spinlock_t tx_lock;
int max_num_pending_tx;
int num_pending_tx;
struct sk_buff **pending_tx;
unsigned long *used_msdu_ids; /* bitmap */
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;
/* 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);
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);
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
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