1 /*-
2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * $FreeBSD: src/sys/net80211/ieee80211_ht.h,v 1.11 2008/10/25 23:58:59 sam Exp $
26 */
27 #ifndef _NET80211_IEEE80211_HT_H_
28 #define _NET80211_IEEE80211_HT_H_
29
30 /*
31 * 802.11n protocol implementation definitions.
32 */
33
34 #define IEEE80211_AGGR_BAWMAX 64 /* max block ack window size */
35 /* threshold for aging overlapping non-HT bss */
36 #define IEEE80211_NONHT_PRESENT_AGE msecs_to_ticks(60*1000)
37
38 typedef uint16_t ieee80211_seq;
39
40 struct ieee80211_tx_ampdu {
41 struct ieee80211_node *txa_ni; /* back pointer */
42 u_short txa_flags;
43 #define IEEE80211_AGGR_IMMEDIATE 0x0001 /* BA policy */
44 #define IEEE80211_AGGR_XCHGPEND 0x0002 /* ADDBA response pending */
45 #define IEEE80211_AGGR_RUNNING 0x0004 /* ADDBA response received */
46 #define IEEE80211_AGGR_SETUP 0x0008 /* deferred state setup */
47 #define IEEE80211_AGGR_NAK 0x0010 /* peer NAK'd ADDBA request */
48 #define IEEE80211_AGGR_BARPEND 0x0020 /* BAR response pending */
49 uint8_t txa_ac;
50 uint8_t txa_token; /* dialog token */
51 int txa_lastsample; /* ticks @ last traffic sample */
52 int txa_pkts; /* packets over last sample interval */
53 int txa_avgpps; /* filtered traffic over window */
54 int txa_qbytes; /* data queued (bytes) */
55 short txa_qframes; /* data queued (frames) */
56 ieee80211_seq txa_start; /* BA window left edge */
57 ieee80211_seq txa_seqpending; /* new txa_start pending BAR response */
58 uint16_t txa_wnd; /* BA window size */
59 uint8_t txa_attempts; /* # ADDBA/BAR requests w/o a response*/
60 int txa_nextrequest;/* soonest to make next request */
61 struct callout txa_timer;
62 void *txa_private; /* driver-private storage */
63 };
64
65 /* return non-zero if AMPDU tx for the TID is running */
66 #define IEEE80211_AMPDU_RUNNING(tap) \
67 (((tap)->txa_flags & IEEE80211_AGGR_RUNNING) != 0)
68
69 /* return non-zero if AMPDU tx for the TID is running or started */
70 #define IEEE80211_AMPDU_REQUESTED(tap) \
71 (((tap)->txa_flags & \
72 (IEEE80211_AGGR_RUNNING|IEEE80211_AGGR_XCHGPEND|IEEE80211_AGGR_NAK)) != 0)
73
74 /*
75 * Traffic estimator support. We estimate packets/sec for
76 * each AC that is setup for AMPDU or will potentially be
77 * setup for AMPDU. The traffic rate can be used to decide
78 * when AMPDU should be setup (according to a threshold)
79 * and is available for drivers to do things like cache
80 * eviction when only a limited number of BA streams are
81 * available and more streams are requested than available.
82 */
83
84 static __inline void
85 ieee80211_txampdu_update_pps(struct ieee80211_tx_ampdu *tap)
86 {
87 /* NB: scale factor of 2 was picked heuristically */
88 tap->txa_avgpps = ((tap->txa_avgpps << 2) -
89 tap->txa_avgpps + tap->txa_pkts) >> 2;
90 }
91
92 /*
93 * Count a packet towards the pps estimate.
94 */
95 static __inline void
96 ieee80211_txampdu_count_packet(struct ieee80211_tx_ampdu *tap)
97 {
98 /* XXX bound loop/do more crude estimate? */
99 while (ticks - tap->txa_lastsample >= hz) {
100 ieee80211_txampdu_update_pps(tap);
101 /* reset to start new sample interval */
102 tap->txa_pkts = 0;
103 if (tap->txa_avgpps == 0) {
104 tap->txa_lastsample = ticks;
105 break;
106 }
107 tap->txa_lastsample += hz;
108 }
109 tap->txa_pkts++;
110 }
111
112 /*
113 * Get the current pps estimate. If the average is out of
114 * date due to lack of traffic then we decay the estimate
115 * to account for the idle time.
116 */
117 static __inline int
118 ieee80211_txampdu_getpps(struct ieee80211_tx_ampdu *tap)
119 {
120 /* XXX bound loop/do more crude estimate? */
121 while (ticks - tap->txa_lastsample >= hz) {
122 ieee80211_txampdu_update_pps(tap);
123 tap->txa_pkts = 0;
124 if (tap->txa_avgpps == 0) {
125 tap->txa_lastsample = ticks;
126 break;
127 }
128 tap->txa_lastsample += hz;
129 }
130 return tap->txa_avgpps;
131 }
132
133 struct ieee80211_rx_ampdu {
134 int rxa_flags;
135 int rxa_qbytes; /* data queued (bytes) */
136 short rxa_qframes; /* data queued (frames) */
137 ieee80211_seq rxa_seqstart;
138 ieee80211_seq rxa_start; /* start of current BA window */
139 uint16_t rxa_wnd; /* BA window size */
140 int rxa_age; /* age of oldest frame in window */
141 int rxa_nframes; /* frames since ADDBA */
142 struct mbuf *rxa_m[IEEE80211_AGGR_BAWMAX];
143 };
144
145 void ieee80211_ht_attach(struct ieee80211com *);
146 void ieee80211_ht_detach(struct ieee80211com *);
147 void ieee80211_ht_vattach(struct ieee80211vap *);
148 void ieee80211_ht_vdetach(struct ieee80211vap *);
149
150 void ieee80211_ht_announce(struct ieee80211com *);
151
152 struct ieee80211_mcs_rates {
153 uint16_t ht20_rate_800ns;
154 uint16_t ht20_rate_400ns;
155 uint16_t ht40_rate_800ns;
156 uint16_t ht40_rate_400ns;
157 };
158 extern const struct ieee80211_mcs_rates ieee80211_htrates[16];
159 const struct ieee80211_htrateset *ieee80211_get_suphtrates(
160 struct ieee80211com *, const struct ieee80211_channel *);
161
162 struct ieee80211_node;
163 int ieee80211_setup_htrates(struct ieee80211_node *,
164 const uint8_t *htcap, int flags);
165 void ieee80211_setup_basic_htrates(struct ieee80211_node *,
166 const uint8_t *htinfo);
167 struct mbuf *ieee80211_decap_amsdu(struct ieee80211_node *, struct mbuf *);
168 int ieee80211_ampdu_reorder(struct ieee80211_node *, struct mbuf *);
169 void ieee80211_recv_bar(struct ieee80211_node *, struct mbuf *);
170 void ieee80211_ht_node_init(struct ieee80211_node *);
171 void ieee80211_ht_node_cleanup(struct ieee80211_node *);
172 void ieee80211_ht_node_age(struct ieee80211_node *);
173
174 struct ieee80211_channel *ieee80211_ht_adjust_channel(struct ieee80211com *,
175 struct ieee80211_channel *, int);
176 void ieee80211_ht_wds_init(struct ieee80211_node *);
177 void ieee80211_ht_node_join(struct ieee80211_node *);
178 void ieee80211_ht_node_leave(struct ieee80211_node *);
179 void ieee80211_htprot_update(struct ieee80211com *, int protmode);
180 void ieee80211_ht_timeout(struct ieee80211com *);
181 void ieee80211_parse_htcap(struct ieee80211_node *, const uint8_t *);
182 void ieee80211_parse_htinfo(struct ieee80211_node *, const uint8_t *);
183 void ieee80211_ht_updateparams(struct ieee80211_node *, const uint8_t *,
184 const uint8_t *);
185 void ieee80211_ht_updatehtcap(struct ieee80211_node *, const uint8_t *);
186 void ieee80211_recv_action(struct ieee80211_node *,
187 const uint8_t *, const uint8_t *);
188 int ieee80211_ampdu_request(struct ieee80211_node *,
189 struct ieee80211_tx_ampdu *);
190 void ieee80211_ampdu_stop(struct ieee80211_node *,
191 struct ieee80211_tx_ampdu *, int);
192 int ieee80211_send_bar(struct ieee80211_node *, struct ieee80211_tx_ampdu *,
193 ieee80211_seq);
194 int ieee80211_send_action(struct ieee80211_node *,
195 int, int, uint16_t [4]);
196 uint8_t *ieee80211_add_htcap(uint8_t *, struct ieee80211_node *);
197 uint8_t *ieee80211_add_htcap_vendor(uint8_t *, struct ieee80211_node *);
198 uint8_t *ieee80211_add_htinfo(uint8_t *, struct ieee80211_node *);
199 uint8_t *ieee80211_add_htinfo_vendor(uint8_t *, struct ieee80211_node *);
200 struct ieee80211_beacon_offsets;
201 void ieee80211_ht_update_beacon(struct ieee80211vap *,
202 struct ieee80211_beacon_offsets *);
203 #endif /* _NET80211_IEEE80211_HT_H_ */
204
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