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 */