sta_info.h

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/*
 * Copyright 2002-2005, Devicescape Software, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef STA_INFO_H
#define STA_INFO_H

#include <linux/list.h>
#include <linux/types.h>
#include <linux/if_ether.h>
#include <linux/workqueue.h>
#include <linux/average.h>
#include "key.h"

enum ieee80211_sta_info_flags {
        WLAN_STA_AUTH,
        WLAN_STA_ASSOC,
        WLAN_STA_PS_STA,
        WLAN_STA_AUTHORIZED,
        WLAN_STA_SHORT_PREAMBLE,
        WLAN_STA_ASSOC_AP,
        WLAN_STA_WME,
        WLAN_STA_WDS,
        WLAN_STA_CLEAR_PS_FILT,
        WLAN_STA_MFP,
        WLAN_STA_BLOCK_BA,
        WLAN_STA_PS_DRIVER,
        WLAN_STA_PSPOLL,
        WLAN_STA_TDLS_PEER,
        WLAN_STA_TDLS_PEER_AUTH,
        WLAN_STA_UAPSD,
        WLAN_STA_SP,
};

#define STA_TID_NUM 16
#define ADDBA_RESP_INTERVAL HZ
#define HT_AGG_MAX_RETRIES              0x3

#define HT_AGG_STATE_DRV_READY          0
#define HT_AGG_STATE_RESPONSE_RECEIVED  1
#define HT_AGG_STATE_OPERATIONAL        2
#define HT_AGG_STATE_STOPPING           3
#define HT_AGG_STATE_WANT_START         4
#define HT_AGG_STATE_WANT_STOP          5

struct tid_ampdu_tx {
        struct rcu_head rcu_head;
        struct timer_list addba_resp_timer;
        struct sk_buff_head pending;
        unsigned long state;
        u16 timeout;
        u8 dialog_token;
        u8 stop_initiator;
        bool tx_stop;
        u8 buf_size;

        u16 failed_bar_ssn;
        bool bar_pending;
};

struct tid_ampdu_rx {
        struct rcu_head rcu_head;
        spinlock_t reorder_lock;
        struct sk_buff **reorder_buf;
        unsigned long *reorder_time;
        struct timer_list session_timer;
        struct timer_list reorder_timer;
        u16 head_seq_num;
        u16 stored_mpdu_num;
        u16 ssn;
        u16 buf_size;
        u16 timeout;
        u8 dialog_token;
};

struct sta_ampdu_mlme {
        struct mutex mtx;
        /* rx */
        struct tid_ampdu_rx __rcu *tid_rx[STA_TID_NUM];
        unsigned long tid_rx_timer_expired[BITS_TO_LONGS(STA_TID_NUM)];
        unsigned long tid_rx_stop_requested[BITS_TO_LONGS(STA_TID_NUM)];
        /* tx */
        struct work_struct work;
        struct tid_ampdu_tx __rcu *tid_tx[STA_TID_NUM];
        struct tid_ampdu_tx *tid_start_tx[STA_TID_NUM];
        u8 addba_req_num[STA_TID_NUM];
        u8 dialog_token_allocator;
};


struct sta_info {
        /* General information, mostly static */
        struct list_head list;
        struct sta_info __rcu *hnext;
        struct ieee80211_local *local;
        struct ieee80211_sub_if_data *sdata;
        struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
        struct ieee80211_key __rcu *ptk;
        struct rate_control_ref *rate_ctrl;
        void *rate_ctrl_priv;
        spinlock_t lock;

        struct work_struct drv_unblock_wk;

        u16 listen_interval;

        bool dead;

        bool uploaded;

        /* use the accessors defined below */
        unsigned long _flags;

        /*
         * STA powersave frame queues, no more than the internal
         * locking required.
         */
        struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
        struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
        unsigned long driver_buffered_tids;

        /* Updated from RX path only, no locking requirements */
        unsigned long rx_packets, rx_bytes;
        unsigned long wep_weak_iv_count;
        unsigned long last_rx;
        long last_connected;
        unsigned long num_duplicates;
        unsigned long rx_fragments;
        unsigned long rx_dropped;
        int last_signal;
        struct ewma avg_signal;
        /* Plus 1 for non-QoS frames */
        __le16 last_seq_ctrl[NUM_RX_DATA_QUEUES + 1];

        /* Updated from TX status path only, no locking requirements */
        unsigned long tx_filtered_count;
        unsigned long tx_retry_failed, tx_retry_count;
        /* moving percentage of failed MSDUs */
        unsigned int fail_avg;

        /* Updated from TX path only, no locking requirements */
        unsigned long tx_packets;
        unsigned long tx_bytes;
        unsigned long tx_fragments;
        struct ieee80211_tx_rate last_tx_rate;
        int last_rx_rate_idx;
        int last_rx_rate_flag;
        u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];

        /*
         * Aggregation information, locked with lock.
         */
        struct sta_ampdu_mlme ampdu_mlme;
        u8 timer_to_tid[STA_TID_NUM];

#ifdef CONFIG_MAC80211_MESH
        /*
         * Mesh peer link attributes
         * TODO: move to a sub-structure that is referenced with pointer?
         */
        __le16 llid;
        __le16 plid;
        __le16 reason;
        u8 plink_retries;
        bool ignore_plink_timer;
        bool plink_timer_was_running;
        enum nl80211_plink_state plink_state;
        u32 plink_timeout;
        struct timer_list plink_timer;
#endif

#ifdef CONFIG_MAC80211_DEBUGFS
        struct sta_info_debugfsdentries {
                struct dentry *dir;
                bool add_has_run;
        } debugfs;
#endif

        unsigned int lost_packets;

        /* should be right in front of sta to be in the same cache line */
        bool dummy;

        /* keep last! */
        struct ieee80211_sta sta;
};

static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
{
#ifdef CONFIG_MAC80211_MESH
        return sta->plink_state;
#endif
        return NL80211_PLINK_LISTEN;
}

static inline void set_sta_flag(struct sta_info *sta,
                                enum ieee80211_sta_info_flags flag)
{
        set_bit(flag, &sta->_flags);
}

static inline void clear_sta_flag(struct sta_info *sta,
                                  enum ieee80211_sta_info_flags flag)
{
        clear_bit(flag, &sta->_flags);
}

static inline int test_sta_flag(struct sta_info *sta,
                                enum ieee80211_sta_info_flags flag)
{
        return test_bit(flag, &sta->_flags);
}

static inline int test_and_clear_sta_flag(struct sta_info *sta,
                                          enum ieee80211_sta_info_flags flag)
{
        return test_and_clear_bit(flag, &sta->_flags);
}

void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
                             struct tid_ampdu_tx *tid_tx);

static inline struct tid_ampdu_tx *
rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
{
        return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
                                         lockdep_is_held(&sta->lock) ||
                                         lockdep_is_held(&sta->ampdu_mlme.mtx));
}

#define STA_HASH_SIZE 256
#define STA_HASH(sta) (sta[5])


/* Maximum number of frames to buffer per power saving station per AC */
#define STA_MAX_TX_BUFFER       64

/* Minimum buffered frame expiry time. If STA uses listen interval that is
 * smaller than this value, the minimum value here is used instead. */
#define STA_TX_BUFFER_EXPIRE (10 * HZ)

/* How often station data is cleaned up (e.g., expiration of buffered frames)
 */
#define STA_INFO_CLEANUP_INTERVAL (10 * HZ)

/*
 * Get a STA info, must be under RCU read lock.
 */
struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
                              const u8 *addr);

struct sta_info *sta_info_get_rx(struct ieee80211_sub_if_data *sdata,
                              const u8 *addr);

struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
                                  const u8 *addr);

struct sta_info *sta_info_get_bss_rx(struct ieee80211_sub_if_data *sdata,
                                  const u8 *addr);

static inline
void for_each_sta_info_type_check(struct ieee80211_local *local,
                                  const u8 *addr,
                                  struct sta_info *sta,
                                  struct sta_info *nxt)
{
}

#define for_each_sta_info(local, _addr, _sta, nxt)                      \
        for (   /* initialise loop */                                   \
                _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
                nxt = _sta ? rcu_dereference(_sta->hnext) : NULL;       \
                /* typecheck */                                         \
                for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
                /* continue condition */                                \
                _sta;                                                   \
                /* advance loop */                                      \
                _sta = nxt,                                             \
                nxt = _sta ? rcu_dereference(_sta->hnext) : NULL        \
             )                                                          \
        /* run code only if address matches and it's not a dummy sta */ \
        if (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0 &&           \
                !_sta->dummy)

#define for_each_sta_info_rx(local, _addr, _sta, nxt)                   \
        for (   /* initialise loop */                                   \
                _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
                nxt = _sta ? rcu_dereference(_sta->hnext) : NULL;       \
                /* typecheck */                                         \
                for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
                /* continue condition */                                \
                _sta;                                                   \
                /* advance loop */                                      \
                _sta = nxt,                                             \
                nxt = _sta ? rcu_dereference(_sta->hnext) : NULL        \
             )                                                          \
        /* compare address and run code only if it matches */           \
        if (memcmp(_sta->sta.addr, (_addr), ETH_ALEN) == 0)

/*
 * Get STA info by index, BROKEN!
 */
struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
                                     int idx);
/*
 * Create a new STA info, caller owns returned structure
 * until sta_info_insert().
 */
struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
                                u8 *addr, gfp_t gfp);
/*
 * Insert STA info into hash table/list, returns zero or a
 * -EEXIST if (if the same MAC address is already present).
 *
 * Calling the non-rcu version makes the caller relinquish,
 * the _rcu version calls read_lock_rcu() and must be called
 * without it held.
 */
int sta_info_insert(struct sta_info *sta);
int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
int sta_info_insert_atomic(struct sta_info *sta);
int sta_info_reinsert(struct sta_info *sta);

int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
                          const u8 *addr);
int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
                              const u8 *addr);

void sta_info_recalc_tim(struct sta_info *sta);

void sta_info_init(struct ieee80211_local *local);
void sta_info_stop(struct ieee80211_local *local);
int sta_info_flush(struct ieee80211_local *local,
                   struct ieee80211_sub_if_data *sdata);
void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
                          unsigned long exp_time);

void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);

#endif /* STA_INFO_H */