drivers/net/wireless/ath/ath9k/common.h

   1 /*
   2  * Copyright (c) 2009 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <net/mac80211.h>
  18
  19 #include "../ath.h"
  20 #include "../debug.h"
  21
  22 #include "hw.h"
  23
  24 /* Common header for Atheros 802.11n base driver cores */
  25
  26 #define WME_NUM_TID             16
  27 #define WME_BA_BMP_SIZE         64
  28 #define WME_MAX_BA              WME_BA_BMP_SIZE
  29 #define ATH_TID_MAX_BUFS        (2 * WME_MAX_BA)
  30
  31 #define WME_AC_BE   0
  32 #define WME_AC_BK   1
  33 #define WME_AC_VI   2
  34 #define WME_AC_VO   3
  35 #define WME_NUM_AC  4
  36
  37 #define ATH_RSSI_DUMMY_MARKER   0x127
  38 #define ATH_RSSI_LPF_LEN                10
  39 #define RSSI_LPF_THRESHOLD              -20
  40 #define ATH_RSSI_EP_MULTIPLIER     (1<<7)
  41 #define ATH_EP_MUL(x, mul)         ((x) * (mul))
  42 #define ATH_RSSI_IN(x)             (ATH_EP_MUL((x), ATH_RSSI_EP_MULTIPLIER))
  43 #define ATH_LPF_RSSI(x, y, len) \
  44     ((x != ATH_RSSI_DUMMY_MARKER) ? (((x) * ((len) - 1) + (y)) / (len)) : (y))
  45 #define ATH_RSSI_LPF(x, y) do {                                         \
  46     if ((y) >= RSSI_LPF_THRESHOLD)                                      \
  47         x = ATH_LPF_RSSI((x), ATH_RSSI_IN((y)), ATH_RSSI_LPF_LEN);      \
  48 } while (0)
  49 #define ATH_EP_RND(x, mul)                                              \
  50         ((((x)%(mul)) >= ((mul)/2)) ? ((x) + ((mul) - 1)) / (mul) : (x)/(mul))
  51
  52 struct ath_atx_ac {
  53         int sched;
  54         int qnum;
  55         struct list_head list;
  56         struct list_head tid_q;
  57 };
  58
  59 struct ath_buf_state {
  60         int bfs_nframes;
  61         u16 bfs_al;
  62         u16 bfs_frmlen;
  63         int bfs_seqno;
  64         int bfs_tidno;
  65         int bfs_retries;
  66         u8 bf_type;
  67         u32 bfs_keyix;
  68         enum ath9k_key_type bfs_keytype;
  69 };
  70
  71 struct ath_buf {
  72         struct list_head list;
  73         struct ath_buf *bf_lastbf;      /* last buf of this unit (a frame or
  74                                            an aggregate) */
  75         struct ath_buf *bf_next;        /* next subframe in the aggregate */
  76         struct sk_buff *bf_mpdu;        /* enclosing frame structure */
  77         struct ath_desc *bf_desc;       /* virtual addr of desc */
  78         dma_addr_t bf_daddr;            /* physical addr of desc */
  79         dma_addr_t bf_buf_addr;         /* physical addr of data buffer */
  80         bool bf_stale;
  81         bool bf_isnullfunc;
  82         u16 bf_flags;
  83         struct ath_buf_state bf_state;
  84         dma_addr_t bf_dmacontext;
  85         struct ath_wiphy *aphy;
  86 };
  87
  88 struct ath_atx_tid {
  89         struct list_head list;
  90         struct list_head buf_q;
  91         struct ath_node *an;
  92         struct ath_atx_ac *ac;
  93         struct ath_buf *tx_buf[ATH_TID_MAX_BUFS];
  94         u16 seq_start;
  95         u16 seq_next;
  96         u16 baw_size;
  97         int tidno;
  98         int baw_head;   /* first un-acked tx buffer */
  99         int baw_tail;   /* next unused tx buffer slot */
 100         int sched;
 101         int paused;
 102         u8 state;
 103 };
 104
 105 struct ath_node {
 106         struct ath_common *common;
 107         struct ath_atx_tid tid[WME_NUM_TID];
 108         struct ath_atx_ac ac[WME_NUM_AC];
 109         u16 maxampdu;
 110         u8 mpdudensity;
 111         int last_rssi;
 112 };
 113
 114 int ath9k_cmn_rx_skb_preprocess(struct ath_common *common,
 115                                 struct ieee80211_hw *hw,
 116                                 struct sk_buff *skb,
 117                                 struct ath_rx_status *rx_stats,
 118                                 struct ieee80211_rx_status *rx_status,
 119                                 bool *decrypt_error);
 120
 121 void ath9k_cmn_rx_skb_postprocess(struct ath_common *common,
 122                                   struct sk_buff *skb,
 123                                   struct ath_rx_status *rx_stats,
 124                                   struct ieee80211_rx_status *rxs,
 125                                   bool decrypt_error);
 126
 127 int ath9k_cmn_padpos(__le16 frame_control);