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); 128