?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
indent: Avoid using values of pointers that refer to deallocated space.
[freebsd-src.git] / sys / net80211 / ieee80211_ht.c
blob7e3616d3791cefeedc913a90a60ab6ad16d10d21
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
26 #include <sys/cdefs.h>
27 #ifdef __FreeBSD__
28 __FBSDID("$FreeBSD$");
29 #endif
30
31 /*
32 * IEEE 802.11n protocol support.
33 */
34
35 #include "opt_inet.h"
36 #include "opt_wlan.h"
37
38 #include <sys/param.h>
39 #include <sys/kernel.h>
40 #include <sys/malloc.h>
41 #include <sys/systm.h>
42 #include <sys/endian.h>
43
44 #include <sys/socket.h>
45
46 #include <net/if.h>
47 #include <net/if_var.h>
48 #include <net/if_media.h>
49 #include <net/ethernet.h>
50
51 #include <net80211/ieee80211_var.h>
52 #include <net80211/ieee80211_action.h>
53 #include <net80211/ieee80211_input.h>
54
55 /* define here, used throughout file */
56 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
57 #define SM(_v, _f) (((_v) << _f##_S) & _f)
58
59 const struct ieee80211_mcs_rates ieee80211_htrates[IEEE80211_HTRATE_MAXSIZE] = {
60 { 13, 14, 27, 30 }, /* MCS 0 */
61 { 26, 29, 54, 60 }, /* MCS 1 */
62 { 39, 43, 81, 90 }, /* MCS 2 */
63 { 52, 58, 108, 120 }, /* MCS 3 */
64 { 78, 87, 162, 180 }, /* MCS 4 */
65 { 104, 116, 216, 240 }, /* MCS 5 */
66 { 117, 130, 243, 270 }, /* MCS 6 */
67 { 130, 144, 270, 300 }, /* MCS 7 */
68 { 26, 29, 54, 60 }, /* MCS 8 */
69 { 52, 58, 108, 120 }, /* MCS 9 */
70 { 78, 87, 162, 180 }, /* MCS 10 */
71 { 104, 116, 216, 240 }, /* MCS 11 */
72 { 156, 173, 324, 360 }, /* MCS 12 */
73 { 208, 231, 432, 480 }, /* MCS 13 */
74 { 234, 260, 486, 540 }, /* MCS 14 */
75 { 260, 289, 540, 600 }, /* MCS 15 */
76 { 39, 43, 81, 90 }, /* MCS 16 */
77 { 78, 87, 162, 180 }, /* MCS 17 */
78 { 117, 130, 243, 270 }, /* MCS 18 */
79 { 156, 173, 324, 360 }, /* MCS 19 */
80 { 234, 260, 486, 540 }, /* MCS 20 */
81 { 312, 347, 648, 720 }, /* MCS 21 */
82 { 351, 390, 729, 810 }, /* MCS 22 */
83 { 390, 433, 810, 900 }, /* MCS 23 */
84 { 52, 58, 108, 120 }, /* MCS 24 */
85 { 104, 116, 216, 240 }, /* MCS 25 */
86 { 156, 173, 324, 360 }, /* MCS 26 */
87 { 208, 231, 432, 480 }, /* MCS 27 */
88 { 312, 347, 648, 720 }, /* MCS 28 */
89 { 416, 462, 864, 960 }, /* MCS 29 */
90 { 468, 520, 972, 1080 }, /* MCS 30 */
91 { 520, 578, 1080, 1200 }, /* MCS 31 */
92 { 0, 0, 12, 13 }, /* MCS 32 */
93 { 78, 87, 162, 180 }, /* MCS 33 */
94 { 104, 116, 216, 240 }, /* MCS 34 */
95 { 130, 144, 270, 300 }, /* MCS 35 */
96 { 117, 130, 243, 270 }, /* MCS 36 */
97 { 156, 173, 324, 360 }, /* MCS 37 */
98 { 195, 217, 405, 450 }, /* MCS 38 */
99 { 104, 116, 216, 240 }, /* MCS 39 */
100 { 130, 144, 270, 300 }, /* MCS 40 */
101 { 130, 144, 270, 300 }, /* MCS 41 */
102 { 156, 173, 324, 360 }, /* MCS 42 */
103 { 182, 202, 378, 420 }, /* MCS 43 */
104 { 182, 202, 378, 420 }, /* MCS 44 */
105 { 208, 231, 432, 480 }, /* MCS 45 */
106 { 156, 173, 324, 360 }, /* MCS 46 */
107 { 195, 217, 405, 450 }, /* MCS 47 */
108 { 195, 217, 405, 450 }, /* MCS 48 */
109 { 234, 260, 486, 540 }, /* MCS 49 */
110 { 273, 303, 567, 630 }, /* MCS 50 */
111 { 273, 303, 567, 630 }, /* MCS 51 */
112 { 312, 347, 648, 720 }, /* MCS 52 */
113 { 130, 144, 270, 300 }, /* MCS 53 */
114 { 156, 173, 324, 360 }, /* MCS 54 */
115 { 182, 202, 378, 420 }, /* MCS 55 */
116 { 156, 173, 324, 360 }, /* MCS 56 */
117 { 182, 202, 378, 420 }, /* MCS 57 */
118 { 208, 231, 432, 480 }, /* MCS 58 */
119 { 234, 260, 486, 540 }, /* MCS 59 */
120 { 208, 231, 432, 480 }, /* MCS 60 */
121 { 234, 260, 486, 540 }, /* MCS 61 */
122 { 260, 289, 540, 600 }, /* MCS 62 */
123 { 260, 289, 540, 600 }, /* MCS 63 */
124 { 286, 318, 594, 660 }, /* MCS 64 */
125 { 195, 217, 405, 450 }, /* MCS 65 */
126 { 234, 260, 486, 540 }, /* MCS 66 */
127 { 273, 303, 567, 630 }, /* MCS 67 */
128 { 234, 260, 486, 540 }, /* MCS 68 */
129 { 273, 303, 567, 630 }, /* MCS 69 */
130 { 312, 347, 648, 720 }, /* MCS 70 */
131 { 351, 390, 729, 810 }, /* MCS 71 */
132 { 312, 347, 648, 720 }, /* MCS 72 */
133 { 351, 390, 729, 810 }, /* MCS 73 */
134 { 390, 433, 810, 900 }, /* MCS 74 */
135 { 390, 433, 810, 900 }, /* MCS 75 */
136 { 429, 477, 891, 990 }, /* MCS 76 */
137 };
138
139 static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */
140 SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW,
141 &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I",
142 "AMPDU max reorder age (ms)");
143
144 static int ieee80211_recv_bar_ena = 1;
145 SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena,
146 0, "BAR frame processing (ena/dis)");
147
148 static int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */
149 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW,
150 &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
151 "ADDBA request timeout (ms)");
152 static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
153 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW,
154 &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
155 "ADDBA request backoff (ms)");
156 static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
157 SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLFLAG_RW,
158 &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
159
160 static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
161 static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
162
163 static ieee80211_recv_action_func ht_recv_action_ba_addba_request;
164 static ieee80211_recv_action_func ht_recv_action_ba_addba_response;
165 static ieee80211_recv_action_func ht_recv_action_ba_delba;
166 static ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave;
167 static ieee80211_recv_action_func ht_recv_action_ht_txchwidth;
168
169 static ieee80211_send_action_func ht_send_action_ba_addba;
170 static ieee80211_send_action_func ht_send_action_ba_delba;
171 static ieee80211_send_action_func ht_send_action_ht_txchwidth;
172
173 static void
174 ieee80211_ht_init(void)
175 {
176 /*
177 * Setup HT parameters that depends on the clock frequency.
178 */
179 ieee80211_ampdu_age = msecs_to_ticks(500);
180 ieee80211_addba_timeout = msecs_to_ticks(250);
181 ieee80211_addba_backoff = msecs_to_ticks(10*1000);
182 ieee80211_bar_timeout = msecs_to_ticks(250);
183 /*
184 * Register action frame handlers.
185 */
186 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
187 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request);
188 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
189 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response);
190 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
191 IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba);
192 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
193 IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave);
194 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
195 IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth);
196
197 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
198 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba);
199 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
200 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba);
201 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
202 IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba);
203 ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT,
204 IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth);
205 }
206 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL);
207
208 static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
209 struct ieee80211_tx_ampdu *tap);
210 static int ieee80211_addba_request(struct ieee80211_node *ni,
211 struct ieee80211_tx_ampdu *tap,
212 int dialogtoken, int baparamset, int batimeout);
213 static int ieee80211_addba_response(struct ieee80211_node *ni,
214 struct ieee80211_tx_ampdu *tap,
215 int code, int baparamset, int batimeout);
216 static void ieee80211_addba_stop(struct ieee80211_node *ni,
217 struct ieee80211_tx_ampdu *tap);
218 static void null_addba_response_timeout(struct ieee80211_node *ni,
219 struct ieee80211_tx_ampdu *tap);
220
221 static void ieee80211_bar_response(struct ieee80211_node *ni,
222 struct ieee80211_tx_ampdu *tap, int status);
223 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
224 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
225 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
226 int baparamset, int batimeout, int baseqctl);
227 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
228
229 void
230 ieee80211_ht_attach(struct ieee80211com *ic)
231 {
232 /* setup default aggregation policy */
233 ic->ic_recv_action = ieee80211_recv_action;
234 ic->ic_send_action = ieee80211_send_action;
235 ic->ic_ampdu_enable = ieee80211_ampdu_enable;
236 ic->ic_addba_request = ieee80211_addba_request;
237 ic->ic_addba_response = ieee80211_addba_response;
238 ic->ic_addba_response_timeout = null_addba_response_timeout;
239 ic->ic_addba_stop = ieee80211_addba_stop;
240 ic->ic_bar_response = ieee80211_bar_response;
241 ic->ic_ampdu_rx_start = ampdu_rx_start;
242 ic->ic_ampdu_rx_stop = ampdu_rx_stop;
243
244 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
245 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
246 }
247
248 void
249 ieee80211_ht_detach(struct ieee80211com *ic)
250 {
251 }
252
253 void
254 ieee80211_ht_vattach(struct ieee80211vap *vap)
255 {
256
257 /* driver can override defaults */
258 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
259 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
260 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
261 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
262 /* tx aggregation traffic thresholds */
263 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
264 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
265 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
266 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
267
268 if (vap->iv_htcaps & IEEE80211_HTC_HT) {
269 /*
270 * Device is HT capable; enable all HT-related
271 * facilities by default.
272 * XXX these choices may be too aggressive.
273 */
274 vap->iv_flags_ht |= IEEE80211_FHT_HT
275 | IEEE80211_FHT_HTCOMPAT
276 ;
277 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
278 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
279 /* XXX infer from channel list? */
280 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
281 vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
282 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
283 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
284 }
285 /* enable RIFS if capable */
286 if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
287 vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
288
289 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
290 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
291 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
292 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
293 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
294 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
295 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
296
297 if (vap->iv_htcaps & IEEE80211_HTCAP_TXSTBC)
298 vap->iv_flags_ht |= IEEE80211_FHT_STBC_TX;
299 if (vap->iv_htcaps & IEEE80211_HTCAP_RXSTBC)
300 vap->iv_flags_ht |= IEEE80211_FHT_STBC_RX;
301 }
302 /* NB: disable default legacy WDS, too many issues right now */
303 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
304 vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
305 }
306
307 void
308 ieee80211_ht_vdetach(struct ieee80211vap *vap)
309 {
310 }
311
312 static int
313 ht_getrate(struct ieee80211com *ic, int index, enum ieee80211_phymode mode,
314 int ratetype)
315 {
316 int mword, rate;
317
318 mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode);
319 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
320 return (0);
321 switch (ratetype) {
322 case 0:
323 rate = ieee80211_htrates[index].ht20_rate_800ns;
324 break;
325 case 1:
326 rate = ieee80211_htrates[index].ht20_rate_400ns;
327 break;
328 case 2:
329 rate = ieee80211_htrates[index].ht40_rate_800ns;
330 break;
331 default:
332 rate = ieee80211_htrates[index].ht40_rate_400ns;
333 break;
334 }
335 return (rate);
336 }
337
338 static struct printranges {
339 int minmcs;
340 int maxmcs;
341 int txstream;
342 int ratetype;
343 int htcapflags;
344 } ranges[] = {
345 { 0, 7, 1, 0, 0 },
346 { 8, 15, 2, 0, 0 },
347 { 16, 23, 3, 0, 0 },
348 { 24, 31, 4, 0, 0 },
349 { 32, 0, 1, 2, IEEE80211_HTC_TXMCS32 },
350 { 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL },
351 { 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL },
352 { 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL },
353 { 0, 0, 0, 0, 0 },
354 };
355
356 static void
357 ht_rateprint(struct ieee80211com *ic, enum ieee80211_phymode mode, int ratetype)
358 {
359 int minrate, maxrate;
360 struct printranges *range;
361
362 for (range = ranges; range->txstream != 0; range++) {
363 if (ic->ic_txstream < range->txstream)
364 continue;
365 if (range->htcapflags &&
366 (ic->ic_htcaps & range->htcapflags) == 0)
367 continue;
368 if (ratetype < range->ratetype)
369 continue;
370 minrate = ht_getrate(ic, range->minmcs, mode, ratetype);
371 maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype);
372 if (range->maxmcs) {
373 ic_printf(ic, "MCS %d-%d: %d%sMbps - %d%sMbps\n",
374 range->minmcs, range->maxmcs,
375 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""),
376 maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : ""));
377 } else {
378 ic_printf(ic, "MCS %d: %d%sMbps\n", range->minmcs,
379 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""));
380 }
381 }
382 }
383
384 static void
385 ht_announce(struct ieee80211com *ic, enum ieee80211_phymode mode)
386 {
387 const char *modestr = ieee80211_phymode_name[mode];
388
389 ic_printf(ic, "%s MCS 20MHz\n", modestr);
390 ht_rateprint(ic, mode, 0);
391 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) {
392 ic_printf(ic, "%s MCS 20MHz SGI\n", modestr);
393 ht_rateprint(ic, mode, 1);
394 }
395 if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
396 ic_printf(ic, "%s MCS 40MHz:\n", modestr);
397 ht_rateprint(ic, mode, 2);
398 }
399 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
400 (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) {
401 ic_printf(ic, "%s MCS 40MHz SGI:\n", modestr);
402 ht_rateprint(ic, mode, 3);
403 }
404 }
405
406 void
407 ieee80211_ht_announce(struct ieee80211com *ic)
408 {
409
410 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
411 isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
412 ic_printf(ic, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream);
413 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
414 ht_announce(ic, IEEE80211_MODE_11NA);
415 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
416 ht_announce(ic, IEEE80211_MODE_11NG);
417 }
418
419 static struct ieee80211_htrateset htrateset;
420
421 const struct ieee80211_htrateset *
422 ieee80211_get_suphtrates(struct ieee80211com *ic,
423 const struct ieee80211_channel *c)
424 {
425 #define ADDRATE(x) do { \
426 htrateset.rs_rates[htrateset.rs_nrates] = x; \
427 htrateset.rs_nrates++; \
428 } while (0)
429 int i;
430
431 memset(&htrateset, 0, sizeof(struct ieee80211_htrateset));
432 for (i = 0; i < ic->ic_txstream * 8; i++)
433 ADDRATE(i);
434 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
435 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32))
436 ADDRATE(32);
437 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
438 if (ic->ic_txstream >= 2) {
439 for (i = 33; i <= 38; i++)
440 ADDRATE(i);
441 }
442 if (ic->ic_txstream >= 3) {
443 for (i = 39; i <= 52; i++)
444 ADDRATE(i);
445 }
446 if (ic->ic_txstream == 4) {
447 for (i = 53; i <= 76; i++)
448 ADDRATE(i);
449 }
450 }
451 return &htrateset;
452 #undef ADDRATE
453 }
454
455 /*
456 * Receive processing.
457 */
458
459 /*
460 * Decap the encapsulated A-MSDU frames and dispatch all but
461 * the last for delivery. The last frame is returned for
462 * delivery via the normal path.
463 */
464 struct mbuf *
465 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
466 {
467 struct ieee80211vap *vap = ni->ni_vap;
468 int framelen;
469 struct mbuf *n;
470
471 /* discard 802.3 header inserted by ieee80211_decap */
472 m_adj(m, sizeof(struct ether_header));
473
474 vap->iv_stats.is_amsdu_decap++;
475
476 for (;;) {
477 /*
478 * Decap the first frame, bust it apart from the
479 * remainder and deliver. We leave the last frame
480 * delivery to the caller (for consistency with other
481 * code paths, could also do it here).
482 */
483 m = ieee80211_decap1(m, &framelen);
484 if (m == NULL) {
485 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
486 ni->ni_macaddr, "a-msdu", "%s", "decap failed");
487 vap->iv_stats.is_amsdu_tooshort++;
488 return NULL;
489 }
490 if (m->m_pkthdr.len == framelen)
491 break;
492 n = m_split(m, framelen, M_NOWAIT);
493 if (n == NULL) {
494 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
495 ni->ni_macaddr, "a-msdu",
496 "%s", "unable to split encapsulated frames");
497 vap->iv_stats.is_amsdu_split++;
498 m_freem(m); /* NB: must reclaim */
499 return NULL;
500 }
501 vap->iv_deliver_data(vap, ni, m);
502
503 /*
504 * Remove frame contents; each intermediate frame
505 * is required to be aligned to a 4-byte boundary.
506 */
507 m = n;
508 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
509 }
510 return m; /* last delivered by caller */
511 }
512
513 /*
514 * Purge all frames in the A-MPDU re-order queue.
515 */
516 static void
517 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
518 {
519 struct mbuf *m;
520 int i;
521
522 for (i = 0; i < rap->rxa_wnd; i++) {
523 m = rap->rxa_m[i];
524 if (m != NULL) {
525 rap->rxa_m[i] = NULL;
526 rap->rxa_qbytes -= m->m_pkthdr.len;
527 m_freem(m);
528 if (--rap->rxa_qframes == 0)
529 break;
530 }
531 }
532 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
533 ("lost %u data, %u frames on ampdu rx q",
534 rap->rxa_qbytes, rap->rxa_qframes));
535 }
536
537 /*
538 * Start A-MPDU rx/re-order processing for the specified TID.
539 */
540 static int
541 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
542 int baparamset, int batimeout, int baseqctl)
543 {
544 int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
545
546 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
547 /*
548 * AMPDU previously setup and not terminated with a DELBA,
549 * flush the reorder q's in case anything remains.
550 */
551 ampdu_rx_purge(rap);
552 }
553 memset(rap, 0, sizeof(*rap));
554 rap->rxa_wnd = (bufsiz == 0) ?
555 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
556 rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START);
557 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
558
559 return 0;
560 }
561
562 /*
563 * Public function; manually setup the RX ampdu state.
564 */
565 int
566 ieee80211_ampdu_rx_start_ext(struct ieee80211_node *ni, int tid, int seq, int baw)
567 {
568 struct ieee80211_rx_ampdu *rap;
569
570 /* XXX TODO: sanity check tid, seq, baw */
571
572 rap = &ni->ni_rx_ampdu[tid];
573
574 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
575 /*
576 * AMPDU previously setup and not terminated with a DELBA,
577 * flush the reorder q's in case anything remains.
578 */
579 ampdu_rx_purge(rap);
580 }
581
582 memset(rap, 0, sizeof(*rap));
583 rap->rxa_wnd = (baw== 0) ?
584 IEEE80211_AGGR_BAWMAX : min(baw, IEEE80211_AGGR_BAWMAX);
585 rap->rxa_start = seq;
586 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
587
588 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
589 "%s: tid=%d, start=%d, wnd=%d, flags=0x%08x\n",
590 __func__,
591 tid,
592 seq,
593 rap->rxa_wnd,
594 rap->rxa_flags);
595
596 return 0;
597 }
598
599 /*
600 * Stop A-MPDU rx processing for the specified TID.
601 */
602 static void
603 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
604 {
605
606 ampdu_rx_purge(rap);
607 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
608 }
609
610 /*
611 * Dispatch a frame from the A-MPDU reorder queue. The
612 * frame is fed back into ieee80211_input marked with an
613 * M_AMPDU_MPDU flag so it doesn't come back to us (it also
614 * permits ieee80211_input to optimize re-processing).
615 */
616 static __inline void
617 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
618 {
619 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */
620 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
621 (void) ieee80211_input(ni, m, 0, 0);
622 }
623
624 /*
625 * Dispatch as many frames as possible from the re-order queue.
626 * Frames will always be "at the front"; we process all frames
627 * up to the first empty slot in the window. On completion we
628 * cleanup state if there are still pending frames in the current
629 * BA window. We assume the frame at slot 0 is already handled
630 * by the caller; we always start at slot 1.
631 */
632 static void
633 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
634 {
635 struct ieee80211vap *vap = ni->ni_vap;
636 struct mbuf *m;
637 int i;
638
639 /* flush run of frames */
640 for (i = 1; i < rap->rxa_wnd; i++) {
641 m = rap->rxa_m[i];
642 if (m == NULL)
643 break;
644 rap->rxa_m[i] = NULL;
645 rap->rxa_qbytes -= m->m_pkthdr.len;
646 rap->rxa_qframes--;
647
648 ampdu_dispatch(ni, m);
649 }
650 /*
651 * If frames remain, copy the mbuf pointers down so
652 * they correspond to the offsets in the new window.
653 */
654 if (rap->rxa_qframes != 0) {
655 int n = rap->rxa_qframes, j;
656 for (j = i+1; j < rap->rxa_wnd; j++) {
657 if (rap->rxa_m[j] != NULL) {
658 rap->rxa_m[j-i] = rap->rxa_m[j];
659 rap->rxa_m[j] = NULL;
660 if (--n == 0)
661 break;
662 }
663 }
664 KASSERT(n == 0, ("lost %d frames", n));
665 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
666 }
667 /*
668 * Adjust the start of the BA window to
669 * reflect the frames just dispatched.
670 */
671 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
672 vap->iv_stats.is_ampdu_rx_oor += i;
673 }
674
675 /*
676 * Dispatch all frames in the A-MPDU re-order queue.
677 */
678 static void
679 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
680 {
681 struct ieee80211vap *vap = ni->ni_vap;
682 struct mbuf *m;
683 int i;
684
685 for (i = 0; i < rap->rxa_wnd; i++) {
686 m = rap->rxa_m[i];
687 if (m == NULL)
688 continue;
689 rap->rxa_m[i] = NULL;
690 rap->rxa_qbytes -= m->m_pkthdr.len;
691 rap->rxa_qframes--;
692 vap->iv_stats.is_ampdu_rx_oor++;
693
694 ampdu_dispatch(ni, m);
695 if (rap->rxa_qframes == 0)
696 break;
697 }
698 }
699
700 /*
701 * Dispatch all frames in the A-MPDU re-order queue
702 * preceding the specified sequence number. This logic
703 * handles window moves due to a received MSDU or BAR.
704 */
705 static void
706 ampdu_rx_flush_upto(struct ieee80211_node *ni,
707 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
708 {
709 struct ieee80211vap *vap = ni->ni_vap;
710 struct mbuf *m;
711 ieee80211_seq seqno;
712 int i;
713
714 /*
715 * Flush any complete MSDU's with a sequence number lower
716 * than winstart. Gaps may exist. Note that we may actually
717 * dispatch frames past winstart if a run continues; this is
718 * an optimization that avoids having to do a separate pass
719 * to dispatch frames after moving the BA window start.
720 */
721 seqno = rap->rxa_start;
722 for (i = 0; i < rap->rxa_wnd; i++) {
723 m = rap->rxa_m[i];
724 if (m != NULL) {
725 rap->rxa_m[i] = NULL;
726 rap->rxa_qbytes -= m->m_pkthdr.len;
727 rap->rxa_qframes--;
728 vap->iv_stats.is_ampdu_rx_oor++;
729
730 ampdu_dispatch(ni, m);
731 } else {
732 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
733 break;
734 }
735 seqno = IEEE80211_SEQ_INC(seqno);
736 }
737 /*
738 * If frames remain, copy the mbuf pointers down so
739 * they correspond to the offsets in the new window.
740 */
741 if (rap->rxa_qframes != 0) {
742 int n = rap->rxa_qframes, j;
743
744 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
745 KASSERT(rap->rxa_m[0] == NULL,
746 ("%s: BA window slot 0 occupied", __func__));
747 for (j = i+1; j < rap->rxa_wnd; j++) {
748 if (rap->rxa_m[j] != NULL) {
749 rap->rxa_m[j-i] = rap->rxa_m[j];
750 rap->rxa_m[j] = NULL;
751 if (--n == 0)
752 break;
753 }
754 }
755 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
756 "BA win <%d:%d> winstart %d",
757 __func__, n, rap->rxa_qframes, i, rap->rxa_start,
758 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
759 winstart));
760 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
761 }
762 /*
763 * Move the start of the BA window; we use the
764 * sequence number of the last MSDU that was
765 * passed up the stack+1 or winstart if stopped on
766 * a gap in the reorder buffer.
767 */
768 rap->rxa_start = seqno;
769 }
770
771 /*
772 * Process a received QoS data frame for an HT station. Handle
773 * A-MPDU reordering: if this frame is received out of order
774 * and falls within the BA window hold onto it. Otherwise if
775 * this frame completes a run, flush any pending frames. We
776 * return 1 if the frame is consumed. A 0 is returned if
777 * the frame should be processed normally by the caller.
778 */
779 int
780 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
781 {
782 #define IEEE80211_FC0_QOSDATA \
783 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
784 #define PROCESS 0 /* caller should process frame */
785 #define CONSUMED 1 /* frame consumed, caller does nothing */
786 struct ieee80211vap *vap = ni->ni_vap;
787 struct ieee80211_qosframe *wh;
788 struct ieee80211_rx_ampdu *rap;
789 ieee80211_seq rxseq;
790 uint8_t tid;
791 int off;
792
793 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
794 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
795 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
796
797 /* NB: m_len known to be sufficient */
798 wh = mtod(m, struct ieee80211_qosframe *);
799 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
800 /*
801 * Not QoS data, shouldn't get here but just
802 * return it to the caller for processing.
803 */
804 return PROCESS;
805 }
806 if (IEEE80211_IS_DSTODS(wh))
807 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
808 else
809 tid = wh->i_qos[0];
810 tid &= IEEE80211_QOS_TID;
811 rap = &ni->ni_rx_ampdu[tid];
812 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
813 /*
814 * No ADDBA request yet, don't touch.
815 */
816 return PROCESS;
817 }
818 rxseq = le16toh(*(uint16_t *)wh->i_seq);
819 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
820 /*
821 * Fragments are not allowed; toss.
822 */
823 IEEE80211_DISCARD_MAC(vap,
824 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
825 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
826 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
827 vap->iv_stats.is_ampdu_rx_drop++;
828 IEEE80211_NODE_STAT(ni, rx_drop);
829 m_freem(m);
830 return CONSUMED;
831 }
832 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
833 rap->rxa_nframes++;
834 again:
835 if (rxseq == rap->rxa_start) {
836 /*
837 * First frame in window.
838 */
839 if (rap->rxa_qframes != 0) {
840 /*
841 * Dispatch as many packets as we can.
842 */
843 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
844 ampdu_dispatch(ni, m);
845 ampdu_rx_dispatch(rap, ni);
846 return CONSUMED;
847 } else {
848 /*
849 * In order; advance window and notify
850 * caller to dispatch directly.
851 */
852 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
853 return PROCESS;
854 }
855 }
856 /*
857 * Frame is out of order; store if in the BA window.
858 */
859 /* calculate offset in BA window */
860 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
861 if (off < rap->rxa_wnd) {
862 /*
863 * Common case (hopefully): in the BA window.
864 * Sec 9.10.7.6.2 a) (p.137)
865 */
866
867 /*
868 * Check for frames sitting too long in the reorder queue.
869 * This should only ever happen if frames are not delivered
870 * without the sender otherwise notifying us (e.g. with a
871 * BAR to move the window). Typically this happens because
872 * of vendor bugs that cause the sequence number to jump.
873 * When this happens we get a gap in the reorder queue that
874 * leaves frame sitting on the queue until they get pushed
875 * out due to window moves. When the vendor does not send
876 * BAR this move only happens due to explicit packet sends
877 *
878 * NB: we only track the time of the oldest frame in the
879 * reorder q; this means that if we flush we might push
880 * frames that still "new"; if this happens then subsequent
881 * frames will result in BA window moves which cost something
882 * but is still better than a big throughput dip.
883 */
884 if (rap->rxa_qframes != 0) {
885 /* XXX honor batimeout? */
886 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
887 /*
888 * Too long since we received the first
889 * frame; flush the reorder buffer.
890 */
891 if (rap->rxa_qframes != 0) {
892 vap->iv_stats.is_ampdu_rx_age +=
893 rap->rxa_qframes;
894 ampdu_rx_flush(ni, rap);
895 }
896 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
897 return PROCESS;
898 }
899 } else {
900 /*
901 * First frame, start aging timer.
902 */
903 rap->rxa_age = ticks;
904 }
905
906 /* save packet */
907 if (rap->rxa_m[off] == NULL) {
908 rap->rxa_m[off] = m;
909 rap->rxa_qframes++;
910 rap->rxa_qbytes += m->m_pkthdr.len;
911 vap->iv_stats.is_ampdu_rx_reorder++;
912 } else {
913 IEEE80211_DISCARD_MAC(vap,
914 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
915 ni->ni_macaddr, "a-mpdu duplicate",
916 "seqno %u tid %u BA win <%u:%u>",
917 rxseq, tid, rap->rxa_start,
918 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
919 vap->iv_stats.is_rx_dup++;
920 IEEE80211_NODE_STAT(ni, rx_dup);
921 m_freem(m);
922 }
923 return CONSUMED;
924 }
925 if (off < IEEE80211_SEQ_BA_RANGE) {
926 /*
927 * Outside the BA window, but within range;
928 * flush the reorder q and move the window.
929 * Sec 9.10.7.6.2 b) (p.138)
930 */
931 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
932 "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
933 rap->rxa_start,
934 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
935 rap->rxa_qframes, rxseq, tid);
936 vap->iv_stats.is_ampdu_rx_move++;
937
938 /*
939 * The spec says to flush frames up to but not including:
940 * WinStart_B = rxseq - rap->rxa_wnd + 1
941 * Then insert the frame or notify the caller to process
942 * it immediately. We can safely do this by just starting
943 * over again because we know the frame will now be within
944 * the BA window.
945 */
946 /* NB: rxa_wnd known to be >0 */
947 ampdu_rx_flush_upto(ni, rap,
948 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
949 goto again;
950 } else {
951 /*
952 * Outside the BA window and out of range; toss.
953 * Sec 9.10.7.6.2 c) (p.138)
954 */
955 IEEE80211_DISCARD_MAC(vap,
956 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
957 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
958 rap->rxa_start,
959 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
960 rap->rxa_qframes, rxseq, tid,
961 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
962 vap->iv_stats.is_ampdu_rx_drop++;
963 IEEE80211_NODE_STAT(ni, rx_drop);
964 m_freem(m);
965 return CONSUMED;
966 }
967 #undef CONSUMED
968 #undef PROCESS
969 #undef IEEE80211_FC0_QOSDATA
970 }
971
972 /*
973 * Process a BAR ctl frame. Dispatch all frames up to
974 * the sequence number of the frame. If this frame is
975 * out of range it's discarded.
976 */
977 void
978 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
979 {
980 struct ieee80211vap *vap = ni->ni_vap;
981 struct ieee80211_frame_bar *wh;
982 struct ieee80211_rx_ampdu *rap;
983 ieee80211_seq rxseq;
984 int tid, off;
985
986 if (!ieee80211_recv_bar_ena) {
987 #if 0
988 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
989 ni->ni_macaddr, "BAR", "%s", "processing disabled");
990 #endif
991 vap->iv_stats.is_ampdu_bar_bad++;
992 return;
993 }
994 wh = mtod(m0, struct ieee80211_frame_bar *);
995 /* XXX check basic BAR */
996 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
997 rap = &ni->ni_rx_ampdu[tid];
998 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
999 /*
1000 * No ADDBA request yet, don't touch.
1001 */
1002 IEEE80211_DISCARD_MAC(vap,
1003 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
1004 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
1005 vap->iv_stats.is_ampdu_bar_bad++;
1006 return;
1007 }
1008 vap->iv_stats.is_ampdu_bar_rx++;
1009 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
1010 if (rxseq == rap->rxa_start)
1011 return;
1012 /* calculate offset in BA window */
1013 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
1014 if (off < IEEE80211_SEQ_BA_RANGE) {
1015 /*
1016 * Flush the reorder q up to rxseq and move the window.
1017 * Sec 9.10.7.6.3 a) (p.138)
1018 */
1019 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1020 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
1021 rap->rxa_start,
1022 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1023 rap->rxa_qframes, rxseq, tid);
1024 vap->iv_stats.is_ampdu_bar_move++;
1025
1026 ampdu_rx_flush_upto(ni, rap, rxseq);
1027 if (off >= rap->rxa_wnd) {
1028 /*
1029 * BAR specifies a window start to the right of BA
1030 * window; we must move it explicitly since
1031 * ampdu_rx_flush_upto will not.
1032 */
1033 rap->rxa_start = rxseq;
1034 }
1035 } else {
1036 /*
1037 * Out of range; toss.
1038 * Sec 9.10.7.6.3 b) (p.138)
1039 */
1040 IEEE80211_DISCARD_MAC(vap,
1041 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1042 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
1043 rap->rxa_start,
1044 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1045 rap->rxa_qframes, rxseq, tid,
1046 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1047 vap->iv_stats.is_ampdu_bar_oow++;
1048 IEEE80211_NODE_STAT(ni, rx_drop);
1049 }
1050 }
1051
1052 /*
1053 * Setup HT-specific state in a node. Called only
1054 * when HT use is negotiated so we don't do extra
1055 * work for temporary and/or legacy sta's.
1056 */
1057 void
1058 ieee80211_ht_node_init(struct ieee80211_node *ni)
1059 {
1060 struct ieee80211_tx_ampdu *tap;
1061 int tid;
1062
1063 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1064 ni,
1065 "%s: called (%p)",
1066 __func__,
1067 ni);
1068
1069 if (ni->ni_flags & IEEE80211_NODE_HT) {
1070 /*
1071 * Clean AMPDU state on re-associate. This handles the case
1072 * where a station leaves w/o notifying us and then returns
1073 * before node is reaped for inactivity.
1074 */
1075 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1076 ni,
1077 "%s: calling cleanup (%p)",
1078 __func__, ni);
1079 ieee80211_ht_node_cleanup(ni);
1080 }
1081 for (tid = 0; tid < WME_NUM_TID; tid++) {
1082 tap = &ni->ni_tx_ampdu[tid];
1083 tap->txa_tid = tid;
1084 tap->txa_ni = ni;
1085 ieee80211_txampdu_init_pps(tap);
1086 /* NB: further initialization deferred */
1087 }
1088 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
1089 }
1090
1091 /*
1092 * Cleanup HT-specific state in a node. Called only
1093 * when HT use has been marked.
1094 */
1095 void
1096 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
1097 {
1098 struct ieee80211com *ic = ni->ni_ic;
1099 int i;
1100
1101 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1102 ni,
1103 "%s: called (%p)",
1104 __func__, ni);
1105
1106 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
1107
1108 /* XXX optimize this */
1109 for (i = 0; i < WME_NUM_TID; i++) {
1110 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
1111 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
1112 ampdu_tx_stop(tap);
1113 }
1114 for (i = 0; i < WME_NUM_TID; i++)
1115 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
1116
1117 ni->ni_htcap = 0;
1118 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
1119 }
1120
1121 /*
1122 * Age out HT resources for a station.
1123 */
1124 void
1125 ieee80211_ht_node_age(struct ieee80211_node *ni)
1126 {
1127 struct ieee80211vap *vap = ni->ni_vap;
1128 uint8_t tid;
1129
1130 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
1131
1132 for (tid = 0; tid < WME_NUM_TID; tid++) {
1133 struct ieee80211_rx_ampdu *rap;
1134
1135 rap = &ni->ni_rx_ampdu[tid];
1136 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
1137 continue;
1138 if (rap->rxa_qframes == 0)
1139 continue;
1140 /*
1141 * Check for frames sitting too long in the reorder queue.
1142 * See above for more details on what's happening here.
1143 */
1144 /* XXX honor batimeout? */
1145 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
1146 /*
1147 * Too long since we received the first
1148 * frame; flush the reorder buffer.
1149 */
1150 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
1151 ampdu_rx_flush(ni, rap);
1152 }
1153 }
1154 }
1155
1156 static struct ieee80211_channel *
1157 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
1158 {
1159 return ieee80211_find_channel(ic, c->ic_freq,
1160 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
1161 }
1162
1163 /*
1164 * Adjust a channel to be HT/non-HT according to the vap's configuration.
1165 */
1166 struct ieee80211_channel *
1167 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
1168 struct ieee80211_channel *chan, int flags)
1169 {
1170 struct ieee80211_channel *c;
1171
1172 if (flags & IEEE80211_FHT_HT) {
1173 /* promote to HT if possible */
1174 if (flags & IEEE80211_FHT_USEHT40) {
1175 if (!IEEE80211_IS_CHAN_HT40(chan)) {
1176 /* NB: arbitrarily pick ht40+ over ht40- */
1177 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
1178 if (c == NULL)
1179 c = findhtchan(ic, chan,
1180 IEEE80211_CHAN_HT40D);
1181 if (c == NULL)
1182 c = findhtchan(ic, chan,
1183 IEEE80211_CHAN_HT20);
1184 if (c != NULL)
1185 chan = c;
1186 }
1187 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
1188 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
1189 if (c != NULL)
1190 chan = c;
1191 }
1192 } else if (IEEE80211_IS_CHAN_HT(chan)) {
1193 /* demote to legacy, HT use is disabled */
1194 c = ieee80211_find_channel(ic, chan->ic_freq,
1195 chan->ic_flags &~ IEEE80211_CHAN_HT);
1196 if (c != NULL)
1197 chan = c;
1198 }
1199 return chan;
1200 }
1201
1202 /*
1203 * Setup HT-specific state for a legacy WDS peer.
1204 */
1205 void
1206 ieee80211_ht_wds_init(struct ieee80211_node *ni)
1207 {
1208 struct ieee80211vap *vap = ni->ni_vap;
1209 struct ieee80211_tx_ampdu *tap;
1210 int tid;
1211
1212 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
1213
1214 /* XXX check scan cache in case peer has an ap and we have info */
1215 /*
1216 * If setup with a legacy channel; locate an HT channel.
1217 * Otherwise if the inherited channel (from a companion
1218 * AP) is suitable use it so we use the same location
1219 * for the extension channel).
1220 */
1221 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
1222 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
1223
1224 ni->ni_htcap = 0;
1225 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
1226 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
1227 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
1228 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
1229 ni->ni_chw = 40;
1230 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
1231 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
1232 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
1233 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
1234 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
1235 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
1236 } else {
1237 ni->ni_chw = 20;
1238 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
1239 }
1240 ni->ni_htctlchan = ni->ni_chan->ic_ieee;
1241 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
1242 ni->ni_flags |= IEEE80211_NODE_RIFS;
1243 /* XXX does it make sense to enable SMPS? */
1244
1245 ni->ni_htopmode = 0; /* XXX need protection state */
1246 ni->ni_htstbc = 0; /* XXX need info */
1247
1248 for (tid = 0; tid < WME_NUM_TID; tid++) {
1249 tap = &ni->ni_tx_ampdu[tid];
1250 tap->txa_tid = tid;
1251 ieee80211_txampdu_init_pps(tap);
1252 }
1253 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
1254 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
1255 }
1256
1257 /*
1258 * Notify hostap vaps of a change in the HTINFO ie.
1259 */
1260 static void
1261 htinfo_notify(struct ieee80211com *ic)
1262 {
1263 struct ieee80211vap *vap;
1264 int first = 1;
1265
1266 IEEE80211_LOCK_ASSERT(ic);
1267
1268 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1269 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
1270 continue;
1271 if (vap->iv_state != IEEE80211_S_RUN ||
1272 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
1273 continue;
1274 if (first) {
1275 IEEE80211_NOTE(vap,
1276 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1277 vap->iv_bss,
1278 "HT bss occupancy change: %d sta, %d ht, "
1279 "%d ht40%s, HT protmode now 0x%x"
1280 , ic->ic_sta_assoc
1281 , ic->ic_ht_sta_assoc
1282 , ic->ic_ht40_sta_assoc
1283 , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ?
1284 ", non-HT sta present" : ""
1285 , ic->ic_curhtprotmode);
1286 first = 0;
1287 }
1288 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
1289 }
1290 }
1291
1292 /*
1293 * Calculate HT protection mode from current
1294 * state and handle updates.
1295 */
1296 static void
1297 htinfo_update(struct ieee80211com *ic)
1298 {
1299 uint8_t protmode;
1300
1301 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
1302 protmode = IEEE80211_HTINFO_OPMODE_MIXED
1303 | IEEE80211_HTINFO_NONHT_PRESENT;
1304 } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) {
1305 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
1306 | IEEE80211_HTINFO_NONHT_PRESENT;
1307 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
1308 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
1309 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
1310 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
1311 } else {
1312 protmode = IEEE80211_HTINFO_OPMODE_PURE;
1313 }
1314 if (protmode != ic->ic_curhtprotmode) {
1315 ic->ic_curhtprotmode = protmode;
1316 htinfo_notify(ic);
1317 }
1318 }
1319
1320 /*
1321 * Handle an HT station joining a BSS.
1322 */
1323 void
1324 ieee80211_ht_node_join(struct ieee80211_node *ni)
1325 {
1326 struct ieee80211com *ic = ni->ni_ic;
1327
1328 IEEE80211_LOCK_ASSERT(ic);
1329
1330 if (ni->ni_flags & IEEE80211_NODE_HT) {
1331 ic->ic_ht_sta_assoc++;
1332 if (ni->ni_chw == 40)
1333 ic->ic_ht40_sta_assoc++;
1334 }
1335 htinfo_update(ic);
1336 }
1337
1338 /*
1339 * Handle an HT station leaving a BSS.
1340 */
1341 void
1342 ieee80211_ht_node_leave(struct ieee80211_node *ni)
1343 {
1344 struct ieee80211com *ic = ni->ni_ic;
1345
1346 IEEE80211_LOCK_ASSERT(ic);
1347
1348 if (ni->ni_flags & IEEE80211_NODE_HT) {
1349 ic->ic_ht_sta_assoc--;
1350 if (ni->ni_chw == 40)
1351 ic->ic_ht40_sta_assoc--;
1352 }
1353 htinfo_update(ic);
1354 }
1355
1356 /*
1357 * Public version of htinfo_update; used for processing
1358 * beacon frames from overlapping bss.
1359 *
1360 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
1361 * (on receipt of a beacon that advertises MIXED) or
1362 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
1363 * from an overlapping legacy bss). We treat MIXED with
1364 * a higher precedence than PROTOPT (i.e. we will not change
1365 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
1366 * corresponds to how we handle things in htinfo_update.
1367 */
1368 void
1369 ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
1370 {
1371 #define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE)
1372 IEEE80211_LOCK(ic);
1373
1374 /* track non-HT station presence */
1375 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
1376 ("protmode 0x%x", protmode));
1377 ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
1378 ic->ic_lastnonht = ticks;
1379
1380 if (protmode != ic->ic_curhtprotmode &&
1381 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
1382 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
1383 /* push beacon update */
1384 ic->ic_curhtprotmode = protmode;
1385 htinfo_notify(ic);
1386 }
1387 IEEE80211_UNLOCK(ic);
1388 #undef OPMODE
1389 }
1390
1391 /*
1392 * Time out presence of an overlapping bss with non-HT
1393 * stations. When operating in hostap mode we listen for
1394 * beacons from other stations and if we identify a non-HT
1395 * station is present we update the opmode field of the
1396 * HTINFO ie. To identify when all non-HT stations are
1397 * gone we time out this condition.
1398 */
1399 void
1400 ieee80211_ht_timeout(struct ieee80211com *ic)
1401 {
1402 IEEE80211_LOCK_ASSERT(ic);
1403
1404 if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) &&
1405 ieee80211_time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
1406 #if 0
1407 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1408 "%s", "time out non-HT STA present on channel");
1409 #endif
1410 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
1411 htinfo_update(ic);
1412 }
1413 }
1414
1415 /*
1416 * Process an 802.11n HT capabilities ie.
1417 */
1418 void
1419 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
1420 {
1421 if (ie[0] == IEEE80211_ELEMID_VENDOR) {
1422 /*
1423 * Station used Vendor OUI ie to associate;
1424 * mark the node so when we respond we'll use
1425 * the Vendor OUI's and not the standard ie's.
1426 */
1427 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
1428 ie += 4;
1429 } else
1430 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
1431
1432 ni->ni_htcap = le16dec(ie +
1433 __offsetof(struct ieee80211_ie_htcap, hc_cap));
1434 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
1435 }
1436
1437 static void
1438 htinfo_parse(struct ieee80211_node *ni,
1439 const struct ieee80211_ie_htinfo *htinfo)
1440 {
1441 uint16_t w;
1442
1443 ni->ni_htctlchan = htinfo->hi_ctrlchannel;
1444 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
1445 w = le16dec(&htinfo->hi_byte2);
1446 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
1447 w = le16dec(&htinfo->hi_byte45);
1448 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
1449 }
1450
1451 /*
1452 * Parse an 802.11n HT info ie and save useful information
1453 * to the node state. Note this does not effect any state
1454 * changes such as for channel width change.
1455 */
1456 void
1457 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
1458 {
1459 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1460 ie += 4;
1461 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
1462 }
1463
1464 /*
1465 * Handle 11n channel switch. Use the received HT ie's to
1466 * identify the right channel to use. If we cannot locate it
1467 * in the channel table then fallback to legacy operation.
1468 * Note that we use this information to identify the node's
1469 * channel only; the caller is responsible for insuring any
1470 * required channel change is done (e.g. in sta mode when
1471 * parsing the contents of a beacon frame).
1472 */
1473 static int
1474 htinfo_update_chw(struct ieee80211_node *ni, int htflags)
1475 {
1476 struct ieee80211com *ic = ni->ni_ic;
1477 struct ieee80211_channel *c;
1478 int chanflags;
1479 int ret = 0;
1480
1481 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
1482 if (chanflags != ni->ni_chan->ic_flags) {
1483 /* XXX not right for ht40- */
1484 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
1485 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
1486 /*
1487 * No HT40 channel entry in our table; fall back
1488 * to HT20 operation. This should not happen.
1489 */
1490 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
1491 #if 0
1492 IEEE80211_NOTE(ni->ni_vap,
1493 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1494 "no HT40 channel (freq %u), falling back to HT20",
1495 ni->ni_chan->ic_freq);
1496 #endif
1497 /* XXX stat */
1498 }
1499 if (c != NULL && c != ni->ni_chan) {
1500 IEEE80211_NOTE(ni->ni_vap,
1501 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1502 "switch station to HT%d channel %u/0x%x",
1503 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
1504 c->ic_freq, c->ic_flags);
1505 ni->ni_chan = c;
1506 ret = 1;
1507 }
1508 /* NB: caller responsible for forcing any channel change */
1509 }
1510 /* update node's tx channel width */
1511 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
1512 return (ret);
1513 }
1514
1515 /*
1516 * Update 11n MIMO PS state according to received htcap.
1517 */
1518 static __inline int
1519 htcap_update_mimo_ps(struct ieee80211_node *ni)
1520 {
1521 uint16_t oflags = ni->ni_flags;
1522
1523 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
1524 case IEEE80211_HTCAP_SMPS_DYNAMIC:
1525 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1526 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1527 break;
1528 case IEEE80211_HTCAP_SMPS_ENA:
1529 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1530 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1531 break;
1532 case IEEE80211_HTCAP_SMPS_OFF:
1533 default: /* disable on rx of reserved value */
1534 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1535 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1536 break;
1537 }
1538 return (oflags ^ ni->ni_flags);
1539 }
1540
1541 /*
1542 * Update short GI state according to received htcap
1543 * and local settings.
1544 */
1545 static __inline void
1546 htcap_update_shortgi(struct ieee80211_node *ni)
1547 {
1548 struct ieee80211vap *vap = ni->ni_vap;
1549
1550 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
1551 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
1552 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
1553 ni->ni_flags |= IEEE80211_NODE_SGI20;
1554 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
1555 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
1556 ni->ni_flags |= IEEE80211_NODE_SGI40;
1557 }
1558
1559 /*
1560 * Parse and update HT-related state extracted from
1561 * the HT cap and info ie's.
1562 */
1563 int
1564 ieee80211_ht_updateparams(struct ieee80211_node *ni,
1565 const uint8_t *htcapie, const uint8_t *htinfoie)
1566 {
1567 struct ieee80211vap *vap = ni->ni_vap;
1568 const struct ieee80211_ie_htinfo *htinfo;
1569 int htflags;
1570 int ret = 0;
1571
1572 ieee80211_parse_htcap(ni, htcapie);
1573 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1574 htcap_update_mimo_ps(ni);
1575 htcap_update_shortgi(ni);
1576
1577 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
1578 htinfoie += 4;
1579 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
1580 htinfo_parse(ni, htinfo);
1581
1582 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1583 IEEE80211_CHAN_HT20 : 0;
1584 /* NB: honor operating mode constraint */
1585 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
1586 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1587 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
1588 htflags = IEEE80211_CHAN_HT40U;
1589 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
1590 htflags = IEEE80211_CHAN_HT40D;
1591 }
1592 if (htinfo_update_chw(ni, htflags))
1593 ret = 1;
1594
1595 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
1596 (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
1597 ni->ni_flags |= IEEE80211_NODE_RIFS;
1598 else
1599 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
1600
1601 return (ret);
1602 }
1603
1604 /*
1605 * Parse and update HT-related state extracted from the HT cap ie
1606 * for a station joining an HT BSS.
1607 */
1608 void
1609 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
1610 {
1611 struct ieee80211vap *vap = ni->ni_vap;
1612 int htflags;
1613
1614 ieee80211_parse_htcap(ni, htcapie);
1615 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1616 htcap_update_mimo_ps(ni);
1617 htcap_update_shortgi(ni);
1618
1619 /* NB: honor operating mode constraint */
1620 /* XXX 40 MHz intolerant */
1621 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1622 IEEE80211_CHAN_HT20 : 0;
1623 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
1624 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1625 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
1626 htflags = IEEE80211_CHAN_HT40U;
1627 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
1628 htflags = IEEE80211_CHAN_HT40D;
1629 }
1630 (void) htinfo_update_chw(ni, htflags);
1631 }
1632
1633 /*
1634 * Install received HT rate set by parsing the HT cap ie.
1635 */
1636 int
1637 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
1638 {
1639 struct ieee80211com *ic = ni->ni_ic;
1640 struct ieee80211vap *vap = ni->ni_vap;
1641 const struct ieee80211_ie_htcap *htcap;
1642 struct ieee80211_htrateset *rs;
1643 int i, maxequalmcs, maxunequalmcs;
1644
1645 maxequalmcs = ic->ic_txstream * 8 - 1;
1646 maxunequalmcs = 0;
1647 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
1648 if (ic->ic_txstream >= 2)
1649 maxunequalmcs = 38;
1650 if (ic->ic_txstream >= 3)
1651 maxunequalmcs = 52;
1652 if (ic->ic_txstream >= 4)
1653 maxunequalmcs = 76;
1654 }
1655
1656 rs = &ni->ni_htrates;
1657 memset(rs, 0, sizeof(*rs));
1658 if (ie != NULL) {
1659 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1660 ie += 4;
1661 htcap = (const struct ieee80211_ie_htcap *) ie;
1662 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1663 if (isclr(htcap->hc_mcsset, i))
1664 continue;
1665 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
1666 IEEE80211_NOTE(vap,
1667 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1668 "WARNING, HT rate set too large; only "
1669 "using %u rates", IEEE80211_HTRATE_MAXSIZE);
1670 vap->iv_stats.is_rx_rstoobig++;
1671 break;
1672 }
1673 if (i <= 31 && i > maxequalmcs)
1674 continue;
1675 if (i == 32 &&
1676 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0)
1677 continue;
1678 if (i > 32 && i > maxunequalmcs)
1679 continue;
1680 rs->rs_rates[rs->rs_nrates++] = i;
1681 }
1682 }
1683 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
1684 }
1685
1686 /*
1687 * Mark rates in a node's HT rate set as basic according
1688 * to the information in the supplied HT info ie.
1689 */
1690 void
1691 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
1692 {
1693 const struct ieee80211_ie_htinfo *htinfo;
1694 struct ieee80211_htrateset *rs;
1695 int i, j;
1696
1697 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1698 ie += 4;
1699 htinfo = (const struct ieee80211_ie_htinfo *) ie;
1700 rs = &ni->ni_htrates;
1701 if (rs->rs_nrates == 0) {
1702 IEEE80211_NOTE(ni->ni_vap,
1703 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1704 "%s", "WARNING, empty HT rate set");
1705 return;
1706 }
1707 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1708 if (isclr(htinfo->hi_basicmcsset, i))
1709 continue;
1710 for (j = 0; j < rs->rs_nrates; j++)
1711 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
1712 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
1713 }
1714 }
1715
1716 static void
1717 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
1718 {
1719 callout_init(&tap->txa_timer, 1);
1720 tap->txa_flags |= IEEE80211_AGGR_SETUP;
1721 tap->txa_lastsample = ticks;
1722 }
1723
1724 static void
1725 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
1726 {
1727 struct ieee80211_node *ni = tap->txa_ni;
1728 struct ieee80211com *ic = ni->ni_ic;
1729
1730 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
1731 tap->txa_ni,
1732 "%s: called",
1733 __func__);
1734
1735 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
1736 ("txa_flags 0x%x tid %d ac %d", tap->txa_flags, tap->txa_tid,
1737 TID_TO_WME_AC(tap->txa_tid)));
1738
1739 /*
1740 * Stop BA stream if setup so driver has a chance
1741 * to reclaim any resources it might have allocated.
1742 */
1743 ic->ic_addba_stop(ni, tap);
1744 /*
1745 * Stop any pending BAR transmit.
1746 */
1747 bar_stop_timer(tap);
1748
1749 /*
1750 * Reset packet estimate.
1751 */
1752 ieee80211_txampdu_init_pps(tap);
1753
1754 /* NB: clearing NAK means we may re-send ADDBA */
1755 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
1756 }
1757
1758 /*
1759 * ADDBA response timeout.
1760 *
1761 * If software aggregation and per-TID queue management was done here,
1762 * that queue would be unpaused after the ADDBA timeout occurs.
1763 */
1764 static void
1765 addba_timeout(void *arg)
1766 {
1767 struct ieee80211_tx_ampdu *tap = arg;
1768 struct ieee80211_node *ni = tap->txa_ni;
1769 struct ieee80211com *ic = ni->ni_ic;
1770
1771 /* XXX ? */
1772 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1773 tap->txa_attempts++;
1774 ic->ic_addba_response_timeout(ni, tap);
1775 }
1776
1777 static void
1778 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
1779 {
1780 /* XXX use CALLOUT_PENDING instead? */
1781 callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
1782 addba_timeout, tap);
1783 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
1784 tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
1785 }
1786
1787 static void
1788 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
1789 {
1790 /* XXX use CALLOUT_PENDING instead? */
1791 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
1792 callout_stop(&tap->txa_timer);
1793 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1794 }
1795 }
1796
1797 static void
1798 null_addba_response_timeout(struct ieee80211_node *ni,
1799 struct ieee80211_tx_ampdu *tap)
1800 {
1801 }
1802
1803 /*
1804 * Default method for requesting A-MPDU tx aggregation.
1805 * We setup the specified state block and start a timer
1806 * to wait for an ADDBA response frame.
1807 */
1808 static int
1809 ieee80211_addba_request(struct ieee80211_node *ni,
1810 struct ieee80211_tx_ampdu *tap,
1811 int dialogtoken, int baparamset, int batimeout)
1812 {
1813 int bufsiz;
1814
1815 /* XXX locking */
1816 tap->txa_token = dialogtoken;
1817 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
1818 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1819 tap->txa_wnd = (bufsiz == 0) ?
1820 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1821 addba_start_timeout(tap);
1822 return 1;
1823 }
1824
1825 /*
1826 * Called by drivers that wish to request an ADDBA session be
1827 * setup. This brings it up and starts the request timer.
1828 */
1829 int
1830 ieee80211_ampdu_tx_request_ext(struct ieee80211_node *ni, int tid)
1831 {
1832 struct ieee80211_tx_ampdu *tap;
1833
1834 if (tid < 0 || tid > 15)
1835 return (0);
1836 tap = &ni->ni_tx_ampdu[tid];
1837
1838 /* XXX locking */
1839 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
1840 /* do deferred setup of state */
1841 ampdu_tx_setup(tap);
1842 }
1843 /* XXX hack for not doing proper locking */
1844 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
1845 addba_start_timeout(tap);
1846 return (1);
1847 }
1848
1849 /*
1850 * Called by drivers that have marked a session as active.
1851 */
1852 int
1853 ieee80211_ampdu_tx_request_active_ext(struct ieee80211_node *ni, int tid,
1854 int status)
1855 {
1856 struct ieee80211_tx_ampdu *tap;
1857
1858 if (tid < 0 || tid > 15)
1859 return (0);
1860 tap = &ni->ni_tx_ampdu[tid];
1861
1862 /* XXX locking */
1863 addba_stop_timeout(tap);
1864 if (status == 1) {
1865 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
1866 tap->txa_attempts = 0;
1867 } else {
1868 /* mark tid so we don't try again */
1869 tap->txa_flags |= IEEE80211_AGGR_NAK;
1870 }
1871 return (1);
1872 }
1873
1874 /*
1875 * Default method for processing an A-MPDU tx aggregation
1876 * response. We shutdown any pending timer and update the
1877 * state block according to the reply.
1878 */
1879 static int
1880 ieee80211_addba_response(struct ieee80211_node *ni,
1881 struct ieee80211_tx_ampdu *tap,
1882 int status, int baparamset, int batimeout)
1883 {
1884 int bufsiz, tid;
1885
1886 /* XXX locking */
1887 addba_stop_timeout(tap);
1888 if (status == IEEE80211_STATUS_SUCCESS) {
1889 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1890 /* XXX override our request? */
1891 tap->txa_wnd = (bufsiz == 0) ?
1892 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1893 /* XXX AC/TID */
1894 tid = MS(baparamset, IEEE80211_BAPS_TID);
1895 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
1896 tap->txa_attempts = 0;
1897 } else {
1898 /* mark tid so we don't try again */
1899 tap->txa_flags |= IEEE80211_AGGR_NAK;
1900 }
1901 return 1;
1902 }
1903
1904 /*
1905 * Default method for stopping A-MPDU tx aggregation.
1906 * Any timer is cleared and we drain any pending frames.
1907 */
1908 static void
1909 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
1910 {
1911 /* XXX locking */
1912 addba_stop_timeout(tap);
1913 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
1914 /* XXX clear aggregation queue */
1915 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
1916 }
1917 tap->txa_attempts = 0;
1918 }
1919
1920 /*
1921 * Process a received action frame using the default aggregation
1922 * policy. We intercept ADDBA-related frames and use them to
1923 * update our aggregation state. All other frames are passed up
1924 * for processing by ieee80211_recv_action.
1925 */
1926 static int
1927 ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
1928 const struct ieee80211_frame *wh,
1929 const uint8_t *frm, const uint8_t *efrm)
1930 {
1931 struct ieee80211com *ic = ni->ni_ic;
1932 struct ieee80211vap *vap = ni->ni_vap;
1933 struct ieee80211_rx_ampdu *rap;
1934 uint8_t dialogtoken;
1935 uint16_t baparamset, batimeout, baseqctl;
1936 uint16_t args[5];
1937 int tid;
1938
1939 dialogtoken = frm[2];
1940 baparamset = le16dec(frm+3);
1941 batimeout = le16dec(frm+5);
1942 baseqctl = le16dec(frm+7);
1943
1944 tid = MS(baparamset, IEEE80211_BAPS_TID);
1945
1946 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1947 "recv ADDBA request: dialogtoken %u baparamset 0x%x "
1948 "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d",
1949 dialogtoken, baparamset,
1950 tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ),
1951 batimeout,
1952 MS(baseqctl, IEEE80211_BASEQ_START),
1953 MS(baseqctl, IEEE80211_BASEQ_FRAG));
1954
1955 rap = &ni->ni_rx_ampdu[tid];
1956
1957 /* Send ADDBA response */
1958 args[0] = dialogtoken;
1959 /*
1960 * NB: We ack only if the sta associated with HT and
1961 * the ap is configured to do AMPDU rx (the latter
1962 * violates the 11n spec and is mostly for testing).
1963 */
1964 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
1965 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
1966 /* XXX handle ampdu_rx_start failure */
1967 ic->ic_ampdu_rx_start(ni, rap,
1968 baparamset, batimeout, baseqctl);
1969
1970 args[1] = IEEE80211_STATUS_SUCCESS;
1971 } else {
1972 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1973 ni, "reject ADDBA request: %s",
1974 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
1975 "administratively disabled" :
1976 "not negotiated for station");
1977 vap->iv_stats.is_addba_reject++;
1978 args[1] = IEEE80211_STATUS_UNSPECIFIED;
1979 }
1980 /* XXX honor rap flags? */
1981 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
1982 | SM(tid, IEEE80211_BAPS_TID)
1983 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
1984 ;
1985 args[3] = 0;
1986 args[4] = 0;
1987 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1988 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
1989 return 0;
1990 }
1991
1992 static int
1993 ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
1994 const struct ieee80211_frame *wh,
1995 const uint8_t *frm, const uint8_t *efrm)
1996 {
1997 struct ieee80211com *ic = ni->ni_ic;
1998 struct ieee80211vap *vap = ni->ni_vap;
1999 struct ieee80211_tx_ampdu *tap;
2000 uint8_t dialogtoken, policy;
2001 uint16_t baparamset, batimeout, code;
2002 int tid, bufsiz;
2003
2004 dialogtoken = frm[2];
2005 code = le16dec(frm+3);
2006 baparamset = le16dec(frm+5);
2007 tid = MS(baparamset, IEEE80211_BAPS_TID);
2008 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
2009 policy = MS(baparamset, IEEE80211_BAPS_POLICY);
2010 batimeout = le16dec(frm+7);
2011
2012 tap = &ni->ni_tx_ampdu[tid];
2013 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
2014 IEEE80211_DISCARD_MAC(vap,
2015 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2016 ni->ni_macaddr, "ADDBA response",
2017 "no pending ADDBA, tid %d dialogtoken %u "
2018 "code %d", tid, dialogtoken, code);
2019 vap->iv_stats.is_addba_norequest++;
2020 return 0;
2021 }
2022 if (dialogtoken != tap->txa_token) {
2023 IEEE80211_DISCARD_MAC(vap,
2024 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2025 ni->ni_macaddr, "ADDBA response",
2026 "dialogtoken mismatch: waiting for %d, "
2027 "received %d, tid %d code %d",
2028 tap->txa_token, dialogtoken, tid, code);
2029 vap->iv_stats.is_addba_badtoken++;
2030 return 0;
2031 }
2032 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
2033 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
2034 IEEE80211_DISCARD_MAC(vap,
2035 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2036 ni->ni_macaddr, "ADDBA response",
2037 "policy mismatch: expecting %s, "
2038 "received %s, tid %d code %d",
2039 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
2040 policy, tid, code);
2041 vap->iv_stats.is_addba_badpolicy++;
2042 return 0;
2043 }
2044 #if 0
2045 /* XXX we take MIN in ieee80211_addba_response */
2046 if (bufsiz > IEEE80211_AGGR_BAWMAX) {
2047 IEEE80211_DISCARD_MAC(vap,
2048 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2049 ni->ni_macaddr, "ADDBA response",
2050 "BA window too large: max %d, "
2051 "received %d, tid %d code %d",
2052 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
2053 vap->iv_stats.is_addba_badbawinsize++;
2054 return 0;
2055 }
2056 #endif
2057 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2058 "recv ADDBA response: dialogtoken %u code %d "
2059 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
2060 dialogtoken, code, baparamset, tid, bufsiz,
2061 batimeout);
2062 ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
2063 return 0;
2064 }
2065
2066 static int
2067 ht_recv_action_ba_delba(struct ieee80211_node *ni,
2068 const struct ieee80211_frame *wh,
2069 const uint8_t *frm, const uint8_t *efrm)
2070 {
2071 struct ieee80211com *ic = ni->ni_ic;
2072 struct ieee80211_rx_ampdu *rap;
2073 struct ieee80211_tx_ampdu *tap;
2074 uint16_t baparamset, code;
2075 int tid;
2076
2077 baparamset = le16dec(frm+2);
2078 code = le16dec(frm+4);
2079
2080 tid = MS(baparamset, IEEE80211_DELBAPS_TID);
2081
2082 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2083 "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
2084 "code %d", baparamset, tid,
2085 MS(baparamset, IEEE80211_DELBAPS_INIT), code);
2086
2087 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
2088 tap = &ni->ni_tx_ampdu[tid];
2089 ic->ic_addba_stop(ni, tap);
2090 } else {
2091 rap = &ni->ni_rx_ampdu[tid];
2092 ic->ic_ampdu_rx_stop(ni, rap);
2093 }
2094 return 0;
2095 }
2096
2097 static int
2098 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
2099 const struct ieee80211_frame *wh,
2100 const uint8_t *frm, const uint8_t *efrm)
2101 {
2102 int chw;
2103
2104 chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20;
2105
2106 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2107 "%s: HT txchwidth, width %d%s",
2108 __func__, chw, ni->ni_chw != chw ? "*" : "");
2109 if (chw != ni->ni_chw) {
2110 ni->ni_chw = chw;
2111 /* XXX notify on change */
2112 }
2113 return 0;
2114 }
2115
2116 static int
2117 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
2118 const struct ieee80211_frame *wh,
2119 const uint8_t *frm, const uint8_t *efrm)
2120 {
2121 const struct ieee80211_action_ht_mimopowersave *mps =
2122 (const struct ieee80211_action_ht_mimopowersave *) frm;
2123
2124 /* XXX check iv_htcaps */
2125 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
2126 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
2127 else
2128 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
2129 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
2130 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
2131 else
2132 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
2133 /* XXX notify on change */
2134 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2135 "%s: HT MIMO PS (%s%s)", __func__,
2136 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? "on" : "off",
2137 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? "+rts" : ""
2138 );
2139 return 0;
2140 }
2141
2142 /*
2143 * Transmit processing.
2144 */
2145
2146 /*
2147 * Check if A-MPDU should be requested/enabled for a stream.
2148 * We require a traffic rate above a per-AC threshold and we
2149 * also handle backoff from previous failed attempts.
2150 *
2151 * Drivers may override this method to bring in information
2152 * such as link state conditions in making the decision.
2153 */
2154 static int
2155 ieee80211_ampdu_enable(struct ieee80211_node *ni,
2156 struct ieee80211_tx_ampdu *tap)
2157 {
2158 struct ieee80211vap *vap = ni->ni_vap;
2159
2160 if (tap->txa_avgpps <
2161 vap->iv_ampdu_mintraffic[TID_TO_WME_AC(tap->txa_tid)])
2162 return 0;
2163 /* XXX check rssi? */
2164 if (tap->txa_attempts >= ieee80211_addba_maxtries &&
2165 ieee80211_time_after(ticks, tap->txa_nextrequest)) {
2166 /*
2167 * Don't retry too often; txa_nextrequest is set
2168 * to the minimum interval we'll retry after
2169 * ieee80211_addba_maxtries failed attempts are made.
2170 */
2171 return 0;
2172 }
2173 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
2174 "enable AMPDU on tid %d (%s), avgpps %d pkts %d attempt %d",
2175 tap->txa_tid, ieee80211_wme_acnames[TID_TO_WME_AC(tap->txa_tid)],
2176 tap->txa_avgpps, tap->txa_pkts, tap->txa_attempts);
2177 return 1;
2178 }
2179
2180 /*
2181 * Request A-MPDU tx aggregation. Setup local state and
2182 * issue an ADDBA request. BA use will only happen after
2183 * the other end replies with ADDBA response.
2184 */
2185 int
2186 ieee80211_ampdu_request(struct ieee80211_node *ni,
2187 struct ieee80211_tx_ampdu *tap)
2188 {
2189 struct ieee80211com *ic = ni->ni_ic;
2190 uint16_t args[5];
2191 int tid, dialogtoken;
2192 static int tokens = 0; /* XXX */
2193
2194 /* XXX locking */
2195 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
2196 /* do deferred setup of state */
2197 ampdu_tx_setup(tap);
2198 }
2199 /* XXX hack for not doing proper locking */
2200 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
2201
2202 dialogtoken = (tokens+1) % 63; /* XXX */
2203 tid = tap->txa_tid;
2204 tap->txa_start = ni->ni_txseqs[tid];
2205
2206 args[0] = dialogtoken;
2207 args[1] = 0; /* NB: status code not used */
2208 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
2209 | SM(tid, IEEE80211_BAPS_TID)
2210 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
2211 ;
2212 args[3] = 0; /* batimeout */
2213 /* NB: do first so there's no race against reply */
2214 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) {
2215 /* unable to setup state, don't make request */
2216 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2217 ni, "%s: could not setup BA stream for TID %d AC %d",
2218 __func__, tap->txa_tid, TID_TO_WME_AC(tap->txa_tid));
2219 /* defer next try so we don't slam the driver with requests */
2220 tap->txa_attempts = ieee80211_addba_maxtries;
2221 /* NB: check in case driver wants to override */
2222 if (tap->txa_nextrequest <= ticks)
2223 tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
2224 return 0;
2225 }
2226 tokens = dialogtoken; /* allocate token */
2227 /* NB: after calling ic_addba_request so driver can set txa_start */
2228 args[4] = SM(tap->txa_start, IEEE80211_BASEQ_START)
2229 | SM(0, IEEE80211_BASEQ_FRAG)
2230 ;
2231 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2232 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
2233 }
2234
2235 /*
2236 * Terminate an AMPDU tx stream. State is reclaimed
2237 * and the peer notified with a DelBA Action frame.
2238 */
2239 void
2240 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
2241 int reason)
2242 {
2243 struct ieee80211com *ic = ni->ni_ic;
2244 struct ieee80211vap *vap = ni->ni_vap;
2245 uint16_t args[4];
2246
2247 /* XXX locking */
2248 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2249 if (IEEE80211_AMPDU_RUNNING(tap)) {
2250 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2251 ni, "%s: stop BA stream for TID %d (reason: %d (%s))",
2252 __func__, tap->txa_tid, reason,
2253 ieee80211_reason_to_string(reason));
2254 vap->iv_stats.is_ampdu_stop++;
2255
2256 ic->ic_addba_stop(ni, tap);
2257 args[0] = tap->txa_tid;
2258 args[1] = IEEE80211_DELBAPS_INIT;
2259 args[2] = reason; /* XXX reason code */
2260 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2261 IEEE80211_ACTION_BA_DELBA, args);
2262 } else {
2263 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2264 ni, "%s: BA stream for TID %d not running "
2265 "(reason: %d (%s))", __func__, tap->txa_tid, reason,
2266 ieee80211_reason_to_string(reason));
2267 vap->iv_stats.is_ampdu_stop_failed++;
2268 }
2269 }
2270
2271 /* XXX */
2272 static void bar_start_timer(struct ieee80211_tx_ampdu *tap);
2273
2274 static void
2275 bar_timeout(void *arg)
2276 {
2277 struct ieee80211_tx_ampdu *tap = arg;
2278 struct ieee80211_node *ni = tap->txa_ni;
2279
2280 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
2281 ("bar/addba collision, flags 0x%x", tap->txa_flags));
2282
2283 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2284 ni, "%s: tid %u flags 0x%x attempts %d", __func__,
2285 tap->txa_tid, tap->txa_flags, tap->txa_attempts);
2286
2287 /* guard against race with bar_tx_complete */
2288 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2289 return;
2290 /* XXX ? */
2291 if (tap->txa_attempts >= ieee80211_bar_maxtries) {
2292 struct ieee80211com *ic = ni->ni_ic;
2293
2294 ni->ni_vap->iv_stats.is_ampdu_bar_tx_fail++;
2295 /*
2296 * If (at least) the last BAR TX timeout was due to
2297 * an ieee80211_send_bar() failures, then we need
2298 * to make sure we notify the driver that a BAR
2299 * TX did occur and fail. This gives the driver
2300 * a chance to undo any queue pause that may
2301 * have occurred.
2302 */
2303 ic->ic_bar_response(ni, tap, 1);
2304 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
2305 } else {
2306 ni->ni_vap->iv_stats.is_ampdu_bar_tx_retry++;
2307 if (ieee80211_send_bar(ni, tap, tap->txa_seqpending) != 0) {
2308 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2309 ni, "%s: failed to TX, starting timer\n",
2310 __func__);
2311 /*
2312 * If ieee80211_send_bar() fails here, the
2313 * timer may have stopped and/or the pending
2314 * flag may be clear. Because of this,
2315 * fake the BARPEND and reset the timer.
2316 * A retransmission attempt will then occur
2317 * during the next timeout.
2318 */
2319 /* XXX locking */
2320 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2321 bar_start_timer(tap);
2322 }
2323 }
2324 }
2325
2326 static void
2327 bar_start_timer(struct ieee80211_tx_ampdu *tap)
2328 {
2329 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2330 tap->txa_ni,
2331 "%s: called",
2332 __func__);
2333 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
2334 }
2335
2336 static void
2337 bar_stop_timer(struct ieee80211_tx_ampdu *tap)
2338 {
2339 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2340 tap->txa_ni,
2341 "%s: called",
2342 __func__);
2343 callout_stop(&tap->txa_timer);
2344 }
2345
2346 static void
2347 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
2348 {
2349 struct ieee80211_tx_ampdu *tap = arg;
2350
2351 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2352 ni, "%s: tid %u flags 0x%x pending %d status %d",
2353 __func__, tap->txa_tid, tap->txa_flags,
2354 callout_pending(&tap->txa_timer), status);
2355
2356 ni->ni_vap->iv_stats.is_ampdu_bar_tx++;
2357 /* XXX locking */
2358 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
2359 callout_pending(&tap->txa_timer)) {
2360 struct ieee80211com *ic = ni->ni_ic;
2361
2362 if (status == 0) /* ACK'd */
2363 bar_stop_timer(tap);
2364 ic->ic_bar_response(ni, tap, status);
2365 /* NB: just let timer expire so we pace requests */
2366 }
2367 }
2368
2369 static void
2370 ieee80211_bar_response(struct ieee80211_node *ni,
2371 struct ieee80211_tx_ampdu *tap, int status)
2372 {
2373
2374 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2375 tap->txa_ni,
2376 "%s: called",
2377 __func__);
2378 if (status == 0) { /* got ACK */
2379 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2380 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
2381 tap->txa_start,
2382 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
2383 tap->txa_qframes, tap->txa_seqpending,
2384 tap->txa_tid);
2385
2386 /* NB: timer already stopped in bar_tx_complete */
2387 tap->txa_start = tap->txa_seqpending;
2388 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2389 }
2390 }
2391
2392 /*
2393 * Transmit a BAR frame to the specified node. The
2394 * BAR contents are drawn from the supplied aggregation
2395 * state associated with the node.
2396 *
2397 * NB: we only handle immediate ACK w/ compressed bitmap.
2398 */
2399 int
2400 ieee80211_send_bar(struct ieee80211_node *ni,
2401 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
2402 {
2403 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2404 struct ieee80211vap *vap = ni->ni_vap;
2405 struct ieee80211com *ic = ni->ni_ic;
2406 struct ieee80211_frame_bar *bar;
2407 struct mbuf *m;
2408 uint16_t barctl, barseqctl;
2409 uint8_t *frm;
2410 int tid, ret;
2411
2412
2413 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2414 tap->txa_ni,
2415 "%s: called",
2416 __func__);
2417
2418 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
2419 /* no ADDBA response, should not happen */
2420 /* XXX stat+msg */
2421 return EINVAL;
2422 }
2423 /* XXX locking */
2424 bar_stop_timer(tap);
2425
2426 ieee80211_ref_node(ni);
2427
2428 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
2429 if (m == NULL)
2430 senderr(ENOMEM, is_tx_nobuf);
2431
2432 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
2433 m_freem(m);
2434 senderr(ENOMEM, is_tx_nobuf); /* XXX */
2435 /* NOTREACHED */
2436 }
2437
2438 bar = mtod(m, struct ieee80211_frame_bar *);
2439 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2440 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
2441 bar->i_fc[1] = 0;
2442 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
2443 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
2444
2445 tid = tap->txa_tid;
2446 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
2447 0 : IEEE80211_BAR_NOACK)
2448 | IEEE80211_BAR_COMP
2449 | SM(tid, IEEE80211_BAR_TID)
2450 ;
2451 barseqctl = SM(seq, IEEE80211_BAR_SEQ_START);
2452 /* NB: known to have proper alignment */
2453 bar->i_ctl = htole16(barctl);
2454 bar->i_seq = htole16(barseqctl);
2455 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
2456
2457 M_WME_SETAC(m, WME_AC_VO);
2458
2459 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
2460
2461 /* XXX locking */
2462 /* init/bump attempts counter */
2463 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2464 tap->txa_attempts = 1;
2465 else
2466 tap->txa_attempts++;
2467 tap->txa_seqpending = seq;
2468 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2469
2470 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2471 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
2472 tid, barctl, seq, tap->txa_attempts);
2473
2474 /*
2475 * ic_raw_xmit will free the node reference
2476 * regardless of queue/TX success or failure.
2477 */
2478 IEEE80211_TX_LOCK(ic);
2479 ret = ieee80211_raw_output(vap, ni, m, NULL);
2480 IEEE80211_TX_UNLOCK(ic);
2481 if (ret != 0) {
2482 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2483 ni, "send BAR: failed: (ret = %d)\n",
2484 ret);
2485 /* xmit failed, clear state flag */
2486 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2487 vap->iv_stats.is_ampdu_bar_tx_fail++;
2488 return ret;
2489 }
2490 /* XXX hack against tx complete happening before timer is started */
2491 if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
2492 bar_start_timer(tap);
2493 return 0;
2494 bad:
2495 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2496 tap->txa_ni,
2497 "%s: bad! ret=%d",
2498 __func__, ret);
2499 vap->iv_stats.is_ampdu_bar_tx_fail++;
2500 ieee80211_free_node(ni);
2501 return ret;
2502 #undef senderr
2503 }
2504
2505 static int
2506 ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
2507 {
2508 struct ieee80211_bpf_params params;
2509
2510 memset(&params, 0, sizeof(params));
2511 params.ibp_pri = WME_AC_VO;
2512 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
2513 /* NB: we know all frames are unicast */
2514 params.ibp_try0 = ni->ni_txparms->maxretry;
2515 params.ibp_power = ni->ni_txpower;
2516 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
2517 &params);
2518 }
2519
2520 #define ADDSHORT(frm, v) do { \
2521 frm[0] = (v) & 0xff; \
2522 frm[1] = (v) >> 8; \
2523 frm += 2; \
2524 } while (0)
2525
2526 /*
2527 * Send an action management frame. The arguments are stuff
2528 * into a frame without inspection; the caller is assumed to
2529 * prepare them carefully (e.g. based on the aggregation state).
2530 */
2531 static int
2532 ht_send_action_ba_addba(struct ieee80211_node *ni,
2533 int category, int action, void *arg0)
2534 {
2535 struct ieee80211vap *vap = ni->ni_vap;
2536 struct ieee80211com *ic = ni->ni_ic;
2537 uint16_t *args = arg0;
2538 struct mbuf *m;
2539 uint8_t *frm;
2540
2541 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2542 "send ADDBA %s: dialogtoken %d status %d "
2543 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
2544 (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
2545 "request" : "response",
2546 args[0], args[1], args[2], MS(args[2], IEEE80211_BAPS_TID),
2547 args[3], args[4]);
2548
2549 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2550 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
2551 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
2552 ieee80211_ref_node(ni);
2553
2554 m = ieee80211_getmgtframe(&frm,
2555 ic->ic_headroom + sizeof(struct ieee80211_frame),
2556 sizeof(uint16_t) /* action+category */
2557 /* XXX may action payload */
2558 + sizeof(struct ieee80211_action_ba_addbaresponse)
2559 );
2560 if (m != NULL) {
2561 *frm++ = category;
2562 *frm++ = action;
2563 *frm++ = args[0]; /* dialog token */
2564 if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE)
2565 ADDSHORT(frm, args[1]); /* status code */
2566 ADDSHORT(frm, args[2]); /* baparamset */
2567 ADDSHORT(frm, args[3]); /* batimeout */
2568 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
2569 ADDSHORT(frm, args[4]); /* baseqctl */
2570 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2571 return ht_action_output(ni, m);
2572 } else {
2573 vap->iv_stats.is_tx_nobuf++;
2574 ieee80211_free_node(ni);
2575 return ENOMEM;
2576 }
2577 }
2578
2579 static int
2580 ht_send_action_ba_delba(struct ieee80211_node *ni,
2581 int category, int action, void *arg0)
2582 {
2583 struct ieee80211vap *vap = ni->ni_vap;
2584 struct ieee80211com *ic = ni->ni_ic;
2585 uint16_t *args = arg0;
2586 struct mbuf *m;
2587 uint16_t baparamset;
2588 uint8_t *frm;
2589
2590 baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
2591 | args[1]
2592 ;
2593 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2594 "send DELBA action: tid %d, initiator %d reason %d (%s)",
2595 args[0], args[1], args[2], ieee80211_reason_to_string(args[2]));
2596
2597 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2598 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
2599 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
2600 ieee80211_ref_node(ni);
2601
2602 m = ieee80211_getmgtframe(&frm,
2603 ic->ic_headroom + sizeof(struct ieee80211_frame),
2604 sizeof(uint16_t) /* action+category */
2605 /* XXX may action payload */
2606 + sizeof(struct ieee80211_action_ba_addbaresponse)
2607 );
2608 if (m != NULL) {
2609 *frm++ = category;
2610 *frm++ = action;
2611 ADDSHORT(frm, baparamset);
2612 ADDSHORT(frm, args[2]); /* reason code */
2613 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2614 return ht_action_output(ni, m);
2615 } else {
2616 vap->iv_stats.is_tx_nobuf++;
2617 ieee80211_free_node(ni);
2618 return ENOMEM;
2619 }
2620 }
2621
2622 static int
2623 ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
2624 int category, int action, void *arg0)
2625 {
2626 struct ieee80211vap *vap = ni->ni_vap;
2627 struct ieee80211com *ic = ni->ni_ic;
2628 struct mbuf *m;
2629 uint8_t *frm;
2630
2631 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2632 "send HT txchwidth: width %d",
2633 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
2634
2635 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2636 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
2637 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
2638 ieee80211_ref_node(ni);
2639
2640 m = ieee80211_getmgtframe(&frm,
2641 ic->ic_headroom + sizeof(struct ieee80211_frame),
2642 sizeof(uint16_t) /* action+category */
2643 /* XXX may action payload */
2644 + sizeof(struct ieee80211_action_ba_addbaresponse)
2645 );
2646 if (m != NULL) {
2647 *frm++ = category;
2648 *frm++ = action;
2649 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
2650 IEEE80211_A_HT_TXCHWIDTH_2040 :
2651 IEEE80211_A_HT_TXCHWIDTH_20;
2652 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2653 return ht_action_output(ni, m);
2654 } else {
2655 vap->iv_stats.is_tx_nobuf++;
2656 ieee80211_free_node(ni);
2657 return ENOMEM;
2658 }
2659 }
2660 #undef ADDSHORT
2661
2662 /*
2663 * Construct the MCS bit mask for inclusion in an HT capabilities
2664 * information element.
2665 */
2666 static void
2667 ieee80211_set_mcsset(struct ieee80211com *ic, uint8_t *frm)
2668 {
2669 int i;
2670 uint8_t txparams;
2671
2672 KASSERT((ic->ic_rxstream > 0 && ic->ic_rxstream <= 4),
2673 ("ic_rxstream %d out of range", ic->ic_rxstream));
2674 KASSERT((ic->ic_txstream > 0 && ic->ic_txstream <= 4),
2675 ("ic_txstream %d out of range", ic->ic_txstream));
2676
2677 for (i = 0; i < ic->ic_rxstream * 8; i++)
2678 setbit(frm, i);
2679 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
2680 (ic->ic_htcaps & IEEE80211_HTC_RXMCS32))
2681 setbit(frm, 32);
2682 if (ic->ic_htcaps & IEEE80211_HTC_RXUNEQUAL) {
2683 if (ic->ic_rxstream >= 2) {
2684 for (i = 33; i <= 38; i++)
2685 setbit(frm, i);
2686 }
2687 if (ic->ic_rxstream >= 3) {
2688 for (i = 39; i <= 52; i++)
2689 setbit(frm, i);
2690 }
2691 if (ic->ic_txstream >= 4) {
2692 for (i = 53; i <= 76; i++)
2693 setbit(frm, i);
2694 }
2695 }
2696
2697 if (ic->ic_rxstream != ic->ic_txstream) {
2698 txparams = 0x1; /* TX MCS set defined */
2699 txparams |= 0x2; /* TX RX MCS not equal */
2700 txparams |= (ic->ic_txstream - 1) << 2; /* num TX streams */
2701 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL)
2702 txparams |= 0x16; /* TX unequal modulation sup */
2703 } else
2704 txparams = 0;
2705 frm[12] = txparams;
2706 }
2707
2708 /*
2709 * Add body of an HTCAP information element.
2710 */
2711 static uint8_t *
2712 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
2713 {
2714 #define ADDSHORT(frm, v) do { \
2715 frm[0] = (v) & 0xff; \
2716 frm[1] = (v) >> 8; \
2717 frm += 2; \
2718 } while (0)
2719 struct ieee80211com *ic = ni->ni_ic;
2720 struct ieee80211vap *vap = ni->ni_vap;
2721 uint16_t caps, extcaps;
2722 int rxmax, density;
2723
2724 /* HT capabilities */
2725 caps = vap->iv_htcaps & 0xffff;
2726 /*
2727 * Note channel width depends on whether we are operating as
2728 * a sta or not. When operating as a sta we are generating
2729 * a request based on our desired configuration. Otherwise
2730 * we are operational and the channel attributes identify
2731 * how we've been setup (which might be different if a fixed
2732 * channel is specified).
2733 */
2734 if (vap->iv_opmode == IEEE80211_M_STA) {
2735 /* override 20/40 use based on config */
2736 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
2737 caps |= IEEE80211_HTCAP_CHWIDTH40;
2738 else
2739 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2740
2741 /* Start by using the advertised settings */
2742 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
2743 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
2744
2745 IEEE80211_DPRINTF(vap, IEEE80211_MSG_11N,
2746 "%s: advertised rxmax=%d, density=%d, vap rxmax=%d, density=%d\n",
2747 __func__,
2748 rxmax,
2749 density,
2750 vap->iv_ampdu_rxmax,
2751 vap->iv_ampdu_density);
2752
2753 /* Cap at VAP rxmax */
2754 if (rxmax > vap->iv_ampdu_rxmax)
2755 rxmax = vap->iv_ampdu_rxmax;
2756
2757 /*
2758 * If the VAP ampdu density value greater, use that.
2759 *
2760 * (Larger density value == larger minimum gap between A-MPDU
2761 * subframes.)
2762 */
2763 if (vap->iv_ampdu_density > density)
2764 density = vap->iv_ampdu_density;
2765
2766 /*
2767 * NB: Hardware might support HT40 on some but not all
2768 * channels. We can't determine this earlier because only
2769 * after association the channel is upgraded to HT based
2770 * on the negotiated capabilities.
2771 */
2772 if (ni->ni_chan != IEEE80211_CHAN_ANYC &&
2773 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40U) == NULL &&
2774 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40D) == NULL)
2775 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2776 } else {
2777 /* override 20/40 use based on current channel */
2778 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2779 caps |= IEEE80211_HTCAP_CHWIDTH40;
2780 else
2781 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2782
2783 /* XXX TODO should it start by using advertised settings? */
2784 rxmax = vap->iv_ampdu_rxmax;
2785 density = vap->iv_ampdu_density;
2786 }
2787
2788 /* adjust short GI based on channel and config */
2789 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
2790 caps &= ~IEEE80211_HTCAP_SHORTGI20;
2791 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
2792 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
2793 caps &= ~IEEE80211_HTCAP_SHORTGI40;
2794
2795 /* adjust STBC based on receive capabilities */
2796 if ((vap->iv_flags_ht & IEEE80211_FHT_STBC_RX) == 0)
2797 caps &= ~IEEE80211_HTCAP_RXSTBC;
2798
2799 /* XXX TODO: adjust LDPC based on receive capabilities */
2800
2801 ADDSHORT(frm, caps);
2802
2803 /* HT parameters */
2804 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
2805 | SM(density, IEEE80211_HTCAP_MPDUDENSITY)
2806 ;
2807 frm++;
2808
2809 /* pre-zero remainder of ie */
2810 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
2811 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
2812
2813 /* supported MCS set */
2814 /*
2815 * XXX: For sta mode the rate set should be restricted based
2816 * on the AP's capabilities, but ni_htrates isn't setup when
2817 * we're called to form an AssocReq frame so for now we're
2818 * restricted to the device capabilities.
2819 */
2820 ieee80211_set_mcsset(ni->ni_ic, frm);
2821
2822 frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
2823 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
2824
2825 /* HT extended capabilities */
2826 extcaps = vap->iv_htextcaps & 0xffff;
2827
2828 ADDSHORT(frm, extcaps);
2829
2830 frm += sizeof(struct ieee80211_ie_htcap) -
2831 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
2832
2833 return frm;
2834 #undef ADDSHORT
2835 }
2836
2837 /*
2838 * Add 802.11n HT capabilities information element
2839 */
2840 uint8_t *
2841 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
2842 {
2843 frm[0] = IEEE80211_ELEMID_HTCAP;
2844 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
2845 return ieee80211_add_htcap_body(frm + 2, ni);
2846 }
2847
2848 /*
2849 * Add Broadcom OUI wrapped standard HTCAP ie; this is
2850 * used for compatibility w/ pre-draft implementations.
2851 */
2852 uint8_t *
2853 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
2854 {
2855 frm[0] = IEEE80211_ELEMID_VENDOR;
2856 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
2857 frm[2] = (BCM_OUI >> 0) & 0xff;
2858 frm[3] = (BCM_OUI >> 8) & 0xff;
2859 frm[4] = (BCM_OUI >> 16) & 0xff;
2860 frm[5] = BCM_OUI_HTCAP;
2861 return ieee80211_add_htcap_body(frm + 6, ni);
2862 }
2863
2864 /*
2865 * Construct the MCS bit mask of basic rates
2866 * for inclusion in an HT information element.
2867 */
2868 static void
2869 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
2870 {
2871 int i;
2872
2873 for (i = 0; i < rs->rs_nrates; i++) {
2874 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
2875 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
2876 r < IEEE80211_HTRATE_MAXSIZE) {
2877 /* NB: this assumes a particular implementation */
2878 setbit(frm, r);
2879 }
2880 }
2881 }
2882
2883 /*
2884 * Update the HTINFO ie for a beacon frame.
2885 */
2886 void
2887 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
2888 struct ieee80211_beacon_offsets *bo)
2889 {
2890 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
2891 struct ieee80211_node *ni;
2892 const struct ieee80211_channel *bsschan;
2893 struct ieee80211com *ic = vap->iv_ic;
2894 struct ieee80211_ie_htinfo *ht =
2895 (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
2896
2897 ni = ieee80211_ref_node(vap->iv_bss);
2898 bsschan = ni->ni_chan;
2899
2900 /* XXX only update on channel change */
2901 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
2902 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2903 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
2904 else
2905 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
2906 if (IEEE80211_IS_CHAN_HT40U(bsschan))
2907 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2908 else if (IEEE80211_IS_CHAN_HT40D(bsschan))
2909 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2910 else
2911 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
2912 if (IEEE80211_IS_CHAN_HT40(bsschan))
2913 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
2914
2915 /* protection mode */
2916 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
2917
2918 ieee80211_free_node(ni);
2919
2920 /* XXX propagate to vendor ie's */
2921 #undef PROTMODE
2922 }
2923
2924 /*
2925 * Add body of an HTINFO information element.
2926 *
2927 * NB: We don't use struct ieee80211_ie_htinfo because we can
2928 * be called to fillin both a standard ie and a compat ie that
2929 * has a vendor OUI at the front.
2930 */
2931 static uint8_t *
2932 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
2933 {
2934 struct ieee80211vap *vap = ni->ni_vap;
2935 struct ieee80211com *ic = ni->ni_ic;
2936
2937 /* pre-zero remainder of ie */
2938 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
2939
2940 /* primary/control channel center */
2941 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
2942
2943 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2944 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
2945 else
2946 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
2947 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
2948 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2949 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
2950 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2951 else
2952 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
2953 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2954 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
2955
2956 frm[1] = ic->ic_curhtprotmode;
2957
2958 frm += 5;
2959
2960 /* basic MCS set */
2961 ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
2962 frm += sizeof(struct ieee80211_ie_htinfo) -
2963 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
2964 return frm;
2965 }
2966
2967 /*
2968 * Add 802.11n HT information information element.
2969 */
2970 uint8_t *
2971 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
2972 {
2973 frm[0] = IEEE80211_ELEMID_HTINFO;
2974 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
2975 return ieee80211_add_htinfo_body(frm + 2, ni);
2976 }
2977
2978 /*
2979 * Add Broadcom OUI wrapped standard HTINFO ie; this is
2980 * used for compatibility w/ pre-draft implementations.
2981 */
2982 uint8_t *
2983 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
2984 {
2985 frm[0] = IEEE80211_ELEMID_VENDOR;
2986 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
2987 frm[2] = (BCM_OUI >> 0) & 0xff;
2988 frm[3] = (BCM_OUI >> 8) & 0xff;
2989 frm[4] = (BCM_OUI >> 16) & 0xff;
2990 frm[5] = BCM_OUI_HTINFO;
2991 return ieee80211_add_htinfo_body(frm + 6, ni);
2992 }
FreeBSD src