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
22struct ath_hw;
23struct 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 */
31struct ath_dyn_rxbuf {
32	u16 h_rb, t_rb;
33	u32 tstamp[ATH_DYN_BUF];
34};
35
36struct ts_info {
37	u32 tstamp;
38	u32 dur;
39};
40
41struct 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 */
53struct 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 */
69struct 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)
83void ath_dynack_reset(struct ath_hw *ah);
84void ath_dynack_node_init(struct ath_hw *ah, struct ath_node *an);
85void ath_dynack_node_deinit(struct ath_hw *ah, struct ath_node *an);
86void ath_dynack_init(struct ath_hw *ah);
87void ath_dynack_sample_ack_ts(struct ath_hw *ah, struct sk_buff *skb, u32 ts);
88void 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
92static inline void ath_dynack_init(struct ath_hw *ah) {}
93static inline void ath_dynack_node_init(struct ath_hw *ah,
94					struct ath_node *an) {}
95static inline void ath_dynack_node_deinit(struct ath_hw *ah,
96					  struct ath_node *an) {}
97static inline void ath_dynack_sample_ack_ts(struct ath_hw *ah,
98					    struct sk_buff *skb, u32 ts) {}
99static 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