1 /*
2  * Copyright (c) 2014, Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
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 #ifndef DYNACK_H
18 #define DYNACK_H
19 
20 #define ATH_DYN_BUF	64
21 
22 struct ath_hw;
23 struct ath_node;
24 
25 /**
26  * struct ath_dyn_rxbuf - ACK frame ring buffer
27  * @h_rb: ring buffer head
28  * @t_rb: ring buffer tail
29  * @tstamp: ACK RX timestamp buffer
30  */
31 struct ath_dyn_rxbuf {
32 	u16 h_rb, t_rb;
33 	u32 tstamp[ATH_DYN_BUF];
34 };
35 
36 struct ts_info {
37 	u32 tstamp;
38 	u32 dur;
39 };
40 
41 struct haddr_pair {
42 	u8 h_dest[ETH_ALEN];
43 	u8 h_src[ETH_ALEN];
44 };
45 
46 /**
47  * struct ath_dyn_txbuf - tx frame ring buffer
48  * @h_rb: ring buffer head
49  * @t_rb: ring buffer tail
50  * @addr: dest/src address pair for a given TX frame
51  * @ts: TX frame timestamp buffer
52  */
53 struct ath_dyn_txbuf {
54 	u16 h_rb, t_rb;
55 	struct haddr_pair addr[ATH_DYN_BUF];
56 	struct ts_info ts[ATH_DYN_BUF];
57 };
58 
59 /**
60  * struct ath_dynack - dynack processing info
61  * @enabled: enable dyn ack processing
62  * @ackto: current ACK timeout
63  * @lto: last ACK timeout computation
64  * @nodes: ath_node linked list
65  * @qlock: ts queue spinlock
66  * @ack_rbf: ACK ts ring buffer
67  * @st_rbf: status ts ring buffer
68  */
69 struct ath_dynack {
70 	bool enabled;
71 	int ackto;
72 	unsigned long lto;
73 
74 	struct list_head nodes;
75 
76 	/* protect timestamp queue access */
77 	spinlock_t qlock;
78 	struct ath_dyn_rxbuf ack_rbf;
79 	struct ath_dyn_txbuf st_rbf;
80 };
81 
82 #if defined(CONFIG_ATH9K_DYNACK)
83 void ath_dynack_reset(struct ath_hw *ah);
84 void ath_dynack_node_init(struct ath_hw *ah, struct ath_node *an);
85 void ath_dynack_node_deinit(struct ath_hw *ah, struct ath_node *an);
86 void ath_dynack_init(struct ath_hw *ah);
87 void ath_dynack_sample_ack_ts(struct ath_hw *ah, struct sk_buff *skb, u32 ts);
88 void ath_dynack_sample_tx_ts(struct ath_hw *ah, struct sk_buff *skb,
89 			     struct ath_tx_status *ts,
90 			     struct ieee80211_sta *sta);
91 #else
92 static inline void ath_dynack_init(struct ath_hw *ah) {}
93 static inline void ath_dynack_node_init(struct ath_hw *ah,
94 					struct ath_node *an) {}
95 static inline void ath_dynack_node_deinit(struct ath_hw *ah,
96 					  struct ath_node *an) {}
97 static inline void ath_dynack_sample_ack_ts(struct ath_hw *ah,
98 					    struct sk_buff *skb, u32 ts) {}
99 static inline void ath_dynack_sample_tx_ts(struct ath_hw *ah,
100 					   struct sk_buff *skb,
101 					   struct ath_tx_status *ts,
102 					   struct ieee80211_sta *sta) {}
103 #endif
104 
105 #endif /* DYNACK_H */
106