2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
26 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
32 * IEEE 802.11n protocol support.
38 #include <sys/param.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
41 #include <sys/endian.h>
43 #include <sys/socket.h>
46 #include <net/if_media.h>
47 #include <net/ethernet.h>
49 #include <net80211/ieee80211_var.h>
50 #include <net80211/ieee80211_input.h>
52 /* define here, used throughout file */
53 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
54 #define SM(_v, _f) (((_v) << _f##_S) & _f)
56 const struct ieee80211_mcs_rates ieee80211_htrates[16] = {
57 { 13, 14, 27, 30 }, /* MCS 0 */
58 { 26, 29, 54, 60 }, /* MCS 1 */
59 { 39, 43, 81, 90 }, /* MCS 2 */
60 { 52, 58, 108, 120 }, /* MCS 3 */
61 { 78, 87, 162, 180 }, /* MCS 4 */
62 { 104, 116, 216, 240 }, /* MCS 5 */
63 { 117, 130, 243, 270 }, /* MCS 6 */
64 { 130, 144, 270, 300 }, /* MCS 7 */
65 { 26, 29, 54, 60 }, /* MCS 8 */
66 { 52, 58, 108, 120 }, /* MCS 9 */
67 { 78, 87, 162, 180 }, /* MCS 10 */
68 { 104, 116, 216, 240 }, /* MCS 11 */
69 { 156, 173, 324, 360 }, /* MCS 12 */
70 { 208, 231, 432, 480 }, /* MCS 13 */
71 { 234, 260, 486, 540 }, /* MCS 14 */
72 { 260, 289, 540, 600 } /* MCS 15 */
75 static const struct ieee80211_htrateset ieee80211_rateset_11n =
77 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
78 10, 11, 12, 13, 14, 15 }
81 #ifdef IEEE80211_AMPDU_AGE
82 /* XXX public for sysctl hookup */
83 int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */
85 int ieee80211_recv_bar_ena = 1;
86 int ieee80211_addba_timeout = -1; /* timeout waiting for ADDBA response */
87 int ieee80211_addba_backoff = -1; /* backoff after max ADDBA requests */
88 int ieee80211_addba_maxtries = 3; /* max ADDBA requests before backoff */
91 * Setup HT parameters that depends on the clock frequency.
94 ieee80211_ht_setup(void)
96 #ifdef IEEE80211_AMPDU_AGE
97 ieee80211_ampdu_age = msecs_to_ticks(500);
99 ieee80211_addba_timeout = msecs_to_ticks(250);
100 ieee80211_addba_backoff = msecs_to_ticks(10*1000);
102 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_setup, NULL);
104 static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
105 struct ieee80211_tx_ampdu *tap);
106 static int ieee80211_addba_request(struct ieee80211_node *ni,
107 struct ieee80211_tx_ampdu *tap,
108 int dialogtoken, int baparamset, int batimeout);
109 static int ieee80211_addba_response(struct ieee80211_node *ni,
110 struct ieee80211_tx_ampdu *tap,
111 int code, int baparamset, int batimeout);
112 static void ieee80211_addba_stop(struct ieee80211_node *ni,
113 struct ieee80211_tx_ampdu *tap);
114 static void ieee80211_aggr_recv_action(struct ieee80211_node *ni,
115 const uint8_t *frm, const uint8_t *efrm);
118 ieee80211_ht_attach(struct ieee80211com *ic)
120 /* setup default aggregation policy */
121 ic->ic_recv_action = ieee80211_aggr_recv_action;
122 ic->ic_send_action = ieee80211_send_action;
123 ic->ic_ampdu_enable = ieee80211_ampdu_enable;
124 ic->ic_addba_request = ieee80211_addba_request;
125 ic->ic_addba_response = ieee80211_addba_response;
126 ic->ic_addba_stop = ieee80211_addba_stop;
128 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
129 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
133 ieee80211_ht_detach(struct ieee80211com *ic)
138 ieee80211_ht_vattach(struct ieee80211vap *vap)
141 /* driver can override defaults */
142 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
143 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
144 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
145 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
146 /* tx aggregation traffic thresholds */
147 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
148 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
149 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
150 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
152 if (vap->iv_htcaps & IEEE80211_HTC_HT) {
154 * Device is HT capable; enable all HT-related
155 * facilities by default.
156 * XXX these choices may be too aggressive.
158 vap->iv_flags_ext |= IEEE80211_FEXT_HT
159 | IEEE80211_FEXT_HTCOMPAT
161 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
162 vap->iv_flags_ext |= IEEE80211_FEXT_SHORTGI20;
163 /* XXX infer from channel list? */
164 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
165 vap->iv_flags_ext |= IEEE80211_FEXT_USEHT40;
166 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
167 vap->iv_flags_ext |= IEEE80211_FEXT_SHORTGI40;
169 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
170 vap->iv_flags_ext |= IEEE80211_FEXT_AMPDU_RX;
171 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
172 vap->iv_flags_ext |= IEEE80211_FEXT_AMPDU_TX;
173 vap->iv_flags_ext |= IEEE80211_FEXT_AMSDU_RX;
174 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
175 vap->iv_flags_ext |= IEEE80211_FEXT_AMSDU_TX;
177 /* NB: disable default legacy WDS, too many issues right now */
178 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
179 vap->iv_flags_ext &= ~IEEE80211_FEXT_HT;
183 ieee80211_ht_vdetach(struct ieee80211vap *vap)
188 ht_announce(struct ieee80211com *ic, int mode,
189 const struct ieee80211_htrateset *rs)
191 struct ifnet *ifp = ic->ic_ifp;
194 if_printf(ifp, "%s MCS: ", ieee80211_phymode_name[mode]);
195 for (i = 0; i < rs->rs_nrates; i++) {
196 mword = ieee80211_rate2media(ic,
197 rs->rs_rates[i] | IEEE80211_RATE_MCS, mode);
198 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
200 rate = ieee80211_htrates[rs->rs_rates[i]].ht40_rate_400ns;
201 printf("%s%d%sMbps", (i != 0 ? " " : ""),
202 rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
208 ieee80211_ht_announce(struct ieee80211com *ic)
210 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
211 ht_announce(ic, IEEE80211_MODE_11NA, &ieee80211_rateset_11n);
212 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
213 ht_announce(ic, IEEE80211_MODE_11NG, &ieee80211_rateset_11n);
216 const struct ieee80211_htrateset *
217 ieee80211_get_suphtrates(struct ieee80211com *ic,
218 const struct ieee80211_channel *c)
220 return &ieee80211_rateset_11n;
224 * Receive processing.
228 * Decap the encapsulated A-MSDU frames and dispatch all but
229 * the last for delivery. The last frame is returned for
230 * delivery via the normal path.
233 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
235 struct ieee80211vap *vap = ni->ni_vap;
239 /* discard 802.3 header inserted by ieee80211_decap */
240 m_adj(m, sizeof(struct ether_header));
242 vap->iv_stats.is_amsdu_decap++;
246 * Decap the first frame, bust it apart from the
247 * remainder and deliver. We leave the last frame
248 * delivery to the caller (for consistency with other
249 * code paths, could also do it here).
251 m = ieee80211_decap1(m, &framelen);
253 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
254 ni->ni_macaddr, "a-msdu", "%s", "decap failed");
255 vap->iv_stats.is_amsdu_tooshort++;
258 if (m->m_pkthdr.len == framelen)
260 n = m_split(m, framelen, M_NOWAIT);
262 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
263 ni->ni_macaddr, "a-msdu",
264 "%s", "unable to split encapsulated frames");
265 vap->iv_stats.is_amsdu_split++;
266 m_freem(m); /* NB: must reclaim */
269 vap->iv_deliver_data(vap, ni, m);
272 * Remove frame contents; each intermediate frame
273 * is required to be aligned to a 4-byte boundary.
276 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
278 return m; /* last delivered by caller */
282 * Purge all frames in the A-MPDU re-order queue.
285 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
290 for (i = 0; i < rap->rxa_wnd; i++) {
293 rap->rxa_m[i] = NULL;
294 rap->rxa_qbytes -= m->m_pkthdr.len;
296 if (--rap->rxa_qframes == 0)
300 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
301 ("lost %u data, %u frames on ampdu rx q",
302 rap->rxa_qbytes, rap->rxa_qframes));
306 * Start A-MPDU rx/re-order processing for the specified TID.
309 ampdu_rx_start(struct ieee80211_rx_ampdu *rap, int bufsiz, int start)
311 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
313 * AMPDU previously setup and not terminated with a DELBA,
314 * flush the reorder q's in case anything remains.
318 memset(rap, 0, sizeof(*rap));
319 rap->rxa_wnd = (bufsiz == 0) ?
320 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
321 rap->rxa_start = start;
322 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
326 * Stop A-MPDU rx processing for the specified TID.
329 ampdu_rx_stop(struct ieee80211_rx_ampdu *rap)
332 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
336 * Dispatch a frame from the A-MPDU reorder queue. The
337 * frame is fed back into ieee80211_input marked with an
338 * M_AMPDU flag so it doesn't come back to us (it also
339 * permits ieee80211_input to optimize re-processing).
342 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
344 m->m_flags |= M_AMPDU; /* bypass normal processing */
345 /* NB: rssi, noise, and rstamp are ignored w/ M_AMPDU set */
346 (void) ieee80211_input(ni, m, 0, 0, 0);
350 * Dispatch as many frames as possible from the re-order queue.
351 * Frames will always be "at the front"; we process all frames
352 * up to the first empty slot in the window. On completion we
353 * cleanup state if there are still pending frames in the current
354 * BA window. We assume the frame at slot 0 is already handled
355 * by the caller; we always start at slot 1.
358 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
360 struct ieee80211vap *vap = ni->ni_vap;
364 /* flush run of frames */
365 for (i = 1; i < rap->rxa_wnd; i++) {
369 rap->rxa_m[i] = NULL;
370 rap->rxa_qbytes -= m->m_pkthdr.len;
373 ampdu_dispatch(ni, m);
376 * If frames remain, copy the mbuf pointers down so
377 * they correspond to the offsets in the new window.
379 if (rap->rxa_qframes != 0) {
380 int n = rap->rxa_qframes, j;
381 for (j = i+1; j < rap->rxa_wnd; j++) {
382 if (rap->rxa_m[j] != NULL) {
383 rap->rxa_m[j-i] = rap->rxa_m[j];
384 rap->rxa_m[j] = NULL;
389 KASSERT(n == 0, ("lost %d frames", n));
390 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
393 * Adjust the start of the BA window to
394 * reflect the frames just dispatched.
396 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
397 vap->iv_stats.is_ampdu_rx_oor += i;
400 #ifdef IEEE80211_AMPDU_AGE
402 * Dispatch all frames in the A-MPDU re-order queue.
405 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
407 struct ieee80211vap *vap = ni->ni_vap;
411 for (i = 0; i < rap->rxa_wnd; i++) {
415 rap->rxa_m[i] = NULL;
416 rap->rxa_qbytes -= m->m_pkthdr.len;
418 vap->iv_stats.is_ampdu_rx_oor++;
420 ampdu_dispatch(ni, m);
421 if (rap->rxa_qframes == 0)
425 #endif /* IEEE80211_AMPDU_AGE */
428 * Dispatch all frames in the A-MPDU re-order queue
429 * preceding the specified sequence number. This logic
430 * handles window moves due to a received MSDU or BAR.
433 ampdu_rx_flush_upto(struct ieee80211_node *ni,
434 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
436 struct ieee80211vap *vap = ni->ni_vap;
442 * Flush any complete MSDU's with a sequence number lower
443 * than winstart. Gaps may exist. Note that we may actually
444 * dispatch frames past winstart if a run continues; this is
445 * an optimization that avoids having to do a separate pass
446 * to dispatch frames after moving the BA window start.
448 seqno = rap->rxa_start;
449 for (i = 0; i < rap->rxa_wnd; i++) {
452 rap->rxa_m[i] = NULL;
453 rap->rxa_qbytes -= m->m_pkthdr.len;
455 vap->iv_stats.is_ampdu_rx_oor++;
457 ampdu_dispatch(ni, m);
459 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
462 seqno = IEEE80211_SEQ_INC(seqno);
465 * If frames remain, copy the mbuf pointers down so
466 * they correspond to the offsets in the new window.
468 if (rap->rxa_qframes != 0) {
469 int n = rap->rxa_qframes, j;
471 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
472 KASSERT(rap->rxa_m[0] == NULL,
473 ("%s: BA window slot 0 occupied", __func__));
474 for (j = i+1; j < rap->rxa_wnd; j++) {
475 if (rap->rxa_m[j] != NULL) {
476 rap->rxa_m[j-i] = rap->rxa_m[j];
477 rap->rxa_m[j] = NULL;
482 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
483 "BA win <%d:%d> winstart %d",
484 __func__, n, rap->rxa_qframes, i, rap->rxa_start,
485 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
487 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
490 * Move the start of the BA window; we use the
491 * sequence number of the last MSDU that was
492 * passed up the stack+1 or winstart if stopped on
493 * a gap in the reorder buffer.
495 rap->rxa_start = seqno;
499 * Process a received QoS data frame for an HT station. Handle
500 * A-MPDU reordering: if this frame is received out of order
501 * and falls within the BA window hold onto it. Otherwise if
502 * this frame completes a run, flush any pending frames. We
503 * return 1 if the frame is consumed. A 0 is returned if
504 * the frame should be processed normally by the caller.
507 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
509 #define IEEE80211_FC0_QOSDATA \
510 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
511 #define PROCESS 0 /* caller should process frame */
512 #define CONSUMED 1 /* frame consumed, caller does nothing */
513 struct ieee80211vap *vap = ni->ni_vap;
514 struct ieee80211_qosframe *wh;
515 struct ieee80211_rx_ampdu *rap;
520 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
522 /* NB: m_len known to be sufficient */
523 wh = mtod(m, struct ieee80211_qosframe *);
524 KASSERT(wh->i_fc[0] == IEEE80211_FC0_QOSDATA, ("not QoS data"));
526 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS)
527 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
530 tid &= IEEE80211_QOS_TID;
531 rap = &ni->ni_rx_ampdu[tid];
532 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
534 * No ADDBA request yet, don't touch.
538 rxseq = le16toh(*(uint16_t *)wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
541 if (rxseq == rap->rxa_start) {
543 * First frame in window.
545 if (rap->rxa_qframes != 0) {
547 * Dispatch as many packets as we can.
549 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
550 ampdu_dispatch(ni, m);
551 ampdu_rx_dispatch(rap, ni);
555 * In order; advance window and notify
556 * caller to dispatch directly.
558 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
563 * Frame is out of order; store if in the BA window.
565 /* calculate offset in BA window */
566 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
567 if (off < rap->rxa_wnd) {
569 * Common case (hopefully): in the BA window.
570 * Sec 9.10.7.6 a) (D2.04 p.118 line 47)
572 #ifdef IEEE80211_AMPDU_AGE
574 * Check for frames sitting too long in the reorder queue.
575 * This should only ever happen if frames are not delivered
576 * without the sender otherwise notifying us (e.g. with a
577 * BAR to move the window). Typically this happens because
578 * of vendor bugs that cause the sequence number to jump.
579 * When this happens we get a gap in the reorder queue that
580 * leaves frame sitting on the queue until they get pushed
581 * out due to window moves. When the vendor does not send
582 * BAR this move only happens due to explicit packet sends
584 * NB: we only track the time of the oldest frame in the
585 * reorder q; this means that if we flush we might push
586 * frames that still "new"; if this happens then subsequent
587 * frames will result in BA window moves which cost something
588 * but is still better than a big throughput dip.
590 if (rap->rxa_qframes != 0) {
591 /* XXX honor batimeout? */
592 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
594 * Too long since we received the first
595 * frame; flush the reorder buffer.
597 if (rap->rxa_qframes != 0) {
598 vap->iv_stats.is_ampdu_rx_age +=
600 ampdu_rx_flush(ni, rap);
602 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
607 * First frame, start aging timer.
609 rap->rxa_age = ticks;
611 #endif /* IEEE80211_AMPDU_AGE */
613 if (rap->rxa_m[off] == NULL) {
616 rap->rxa_qbytes += m->m_pkthdr.len;
617 vap->iv_stats.is_ampdu_rx_reorder++;
619 IEEE80211_DISCARD_MAC(vap,
620 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
621 ni->ni_macaddr, "a-mpdu duplicate",
622 "seqno %u tid %u BA win <%u:%u>",
623 rxseq, tid, rap->rxa_start,
624 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
625 vap->iv_stats.is_rx_dup++;
626 IEEE80211_NODE_STAT(ni, rx_dup);
631 if (off < IEEE80211_SEQ_BA_RANGE) {
633 * Outside the BA window, but within range;
634 * flush the reorder q and move the window.
635 * Sec 9.10.7.6 b) (D2.04 p.118 line 60)
637 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
638 "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
640 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
641 rap->rxa_qframes, rxseq, tid);
642 vap->iv_stats.is_ampdu_rx_move++;
645 * The spec says to flush frames up to but not including:
646 * WinStart_B = rxseq - rap->rxa_wnd + 1
647 * Then insert the frame or notify the caller to process
648 * it immediately. We can safely do this by just starting
649 * over again because we know the frame will now be within
652 /* NB: rxa_wnd known to be >0 */
653 ampdu_rx_flush_upto(ni, rap,
654 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
658 * Outside the BA window and out of range; toss.
659 * Sec 9.10.7.6 c) (D2.04 p.119 line 16)
661 IEEE80211_DISCARD_MAC(vap,
662 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
663 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
665 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
666 rap->rxa_qframes, rxseq, tid,
667 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
668 vap->iv_stats.is_ampdu_rx_drop++;
669 IEEE80211_NODE_STAT(ni, rx_drop);
675 #undef IEEE80211_FC0_QOSDATA
679 * Process a BAR ctl frame. Dispatch all frames up to
680 * the sequence number of the frame. If this frame is
681 * out of range it's discarded.
684 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
686 struct ieee80211vap *vap = ni->ni_vap;
687 struct ieee80211_frame_bar *wh;
688 struct ieee80211_rx_ampdu *rap;
692 if (!ieee80211_recv_bar_ena) {
694 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
695 ni->ni_macaddr, "BAR", "%s", "processing disabled");
697 vap->iv_stats.is_ampdu_bar_bad++;
700 wh = mtod(m0, struct ieee80211_frame_bar *);
701 /* XXX check basic BAR */
702 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
703 rap = &ni->ni_rx_ampdu[tid];
704 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
706 * No ADDBA request yet, don't touch.
708 IEEE80211_DISCARD_MAC(vap,
709 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
710 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
711 vap->iv_stats.is_ampdu_bar_bad++;
714 vap->iv_stats.is_ampdu_bar_rx++;
715 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
716 if (rxseq == rap->rxa_start)
718 /* calculate offset in BA window */
719 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
720 if (off < IEEE80211_SEQ_BA_RANGE) {
722 * Flush the reorder q up to rxseq and move the window.
723 * Sec 9.10.7.6 a) (D2.04 p.119 line 22)
725 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
726 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
728 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
729 rap->rxa_qframes, rxseq, tid);
730 vap->iv_stats.is_ampdu_bar_move++;
732 ampdu_rx_flush_upto(ni, rap, rxseq);
733 if (off >= rap->rxa_wnd) {
735 * BAR specifies a window start to the right of BA
736 * window; we must move it explicitly since
737 * ampdu_rx_flush_upto will not.
739 rap->rxa_start = rxseq;
743 * Out of range; toss.
744 * Sec 9.10.7.6 b) (D2.04 p.119 line 41)
746 IEEE80211_DISCARD_MAC(vap,
747 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
748 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
750 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
751 rap->rxa_qframes, rxseq, tid,
752 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
753 vap->iv_stats.is_ampdu_bar_oow++;
754 IEEE80211_NODE_STAT(ni, rx_drop);
759 * Setup HT-specific state in a node. Called only
760 * when HT use is negotiated so we don't do extra
761 * work for temporary and/or legacy sta's.
764 ieee80211_ht_node_init(struct ieee80211_node *ni, const uint8_t *htcap)
766 struct ieee80211_tx_ampdu *tap;
769 if (ni->ni_flags & IEEE80211_NODE_HT) {
771 * Clean AMPDU state on re-associate. This handles the case
772 * where a station leaves w/o notifying us and then returns
773 * before node is reaped for inactivity.
775 ieee80211_ht_node_cleanup(ni);
777 ieee80211_parse_htcap(ni, htcap);
778 for (ac = 0; ac < WME_NUM_AC; ac++) {
779 tap = &ni->ni_tx_ampdu[ac];
781 /* NB: further initialization deferred */
783 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
787 * Cleanup HT-specific state in a node. Called only
788 * when HT use has been marked.
791 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
793 struct ieee80211com *ic = ni->ni_ic;
796 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
798 /* XXX optimize this */
799 for (i = 0; i < WME_NUM_AC; i++) {
800 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
801 if (tap->txa_flags & IEEE80211_AGGR_SETUP) {
803 * Stop BA stream if setup so driver has a chance
804 * to reclaim any resources it might have allocated.
806 ic->ic_addba_stop(ni, &ni->ni_tx_ampdu[i]);
807 IEEE80211_TAPQ_DESTROY(tap);
808 tap->txa_lastsample = 0;
810 /* NB: clearing NAK means we may re-send ADDBA */
812 ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
815 for (i = 0; i < WME_NUM_TID; i++)
816 ampdu_rx_stop(&ni->ni_rx_ampdu[i]);
819 ni->ni_flags &= ~(IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT |
820 IEEE80211_NODE_AMPDU);
824 * Age out HT resources for a station.
827 ieee80211_ht_node_age(struct ieee80211_node *ni)
829 #ifdef IEEE80211_AMPDU_AGE
830 struct ieee80211vap *vap = ni->ni_vap;
834 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
836 #ifdef IEEE80211_AMPDU_AGE
837 for (tid = 0; tid < WME_NUM_TID; tid++) {
838 struct ieee80211_rx_ampdu *rap;
840 rap = &ni->ni_rx_ampdu[tid];
841 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
843 if (rap->rxa_qframes == 0)
846 * Check for frames sitting too long in the reorder queue.
847 * See above for more details on what's happening here.
849 /* XXX honor batimeout? */
850 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
852 * Too long since we received the first
853 * frame; flush the reorder buffer.
855 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
856 ampdu_rx_flush(ni, rap);
859 #endif /* IEEE80211_AMPDU_AGE */
862 static struct ieee80211_channel *
863 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
865 return ieee80211_find_channel(ic, c->ic_freq,
866 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
870 * Adjust a channel to be HT/non-HT according to the vap's configuration.
872 struct ieee80211_channel *
873 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
874 struct ieee80211_channel *chan, int flags)
876 struct ieee80211_channel *c;
878 if (flags & IEEE80211_FEXT_HT) {
879 /* promote to HT if possible */
880 if (flags & IEEE80211_FEXT_USEHT40) {
881 if (!IEEE80211_IS_CHAN_HT40(chan)) {
882 /* NB: arbitrarily pick ht40+ over ht40- */
883 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
885 c = findhtchan(ic, chan,
886 IEEE80211_CHAN_HT40D);
888 c = findhtchan(ic, chan,
889 IEEE80211_CHAN_HT20);
893 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
894 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
898 } else if (IEEE80211_IS_CHAN_HT(chan)) {
899 /* demote to legacy, HT use is disabled */
900 c = ieee80211_find_channel(ic, chan->ic_freq,
901 chan->ic_flags &~ IEEE80211_CHAN_HT);
909 * Setup HT-specific state for a legacy WDS peer.
912 ieee80211_ht_wds_init(struct ieee80211_node *ni)
914 struct ieee80211vap *vap = ni->ni_vap;
915 struct ieee80211_tx_ampdu *tap;
918 KASSERT(vap->iv_flags_ext & IEEE80211_FEXT_HT, ("no HT requested"));
920 /* XXX check scan cache in case peer has an ap and we have info */
922 * If setup with a legacy channel; locate an HT channel.
923 * Otherwise if the inherited channel (from a companion
924 * AP) is suitable use it so we use the same location
925 * for the extension channel).
927 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
928 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
931 if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20)
932 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
933 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
934 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
936 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
937 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
938 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
939 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
940 if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40)
941 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
944 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
946 ni->ni_htctlchan = ni->ni_chan->ic_ieee;
948 ni->ni_htopmode = 0; /* XXX need protection state */
949 ni->ni_htstbc = 0; /* XXX need info */
951 for (ac = 0; ac < WME_NUM_AC; ac++) {
952 tap = &ni->ni_tx_ampdu[ac];
955 /* NB: AMPDU tx/rx governed by IEEE80211_FEXT_AMPDU_{TX,RX} */
956 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
960 * Notify hostap vaps of a change in the HTINFO ie.
963 htinfo_notify(struct ieee80211com *ic)
965 struct ieee80211vap *vap;
968 IEEE80211_LOCK_ASSERT(ic);
970 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
971 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
975 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
977 "HT bss occupancy change: %d sta, %d ht, "
978 "%d ht40%s, HT protmode now 0x%x"
980 , ic->ic_ht_sta_assoc
981 , ic->ic_ht40_sta_assoc
982 , (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) ?
983 ", non-HT sta present" : ""
984 , ic->ic_curhtprotmode);
987 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
992 * Calculate HT protection mode from current
993 * state and handle updates.
996 htinfo_update(struct ieee80211com *ic)
1000 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
1001 protmode = IEEE80211_HTINFO_OPMODE_MIXED
1002 | IEEE80211_HTINFO_NONHT_PRESENT;
1003 } else if (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) {
1004 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
1005 | IEEE80211_HTINFO_NONHT_PRESENT;
1006 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
1007 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
1008 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
1009 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
1011 protmode = IEEE80211_HTINFO_OPMODE_PURE;
1013 if (protmode != ic->ic_curhtprotmode) {
1014 ic->ic_curhtprotmode = protmode;
1020 * Handle an HT station joining a BSS.
1023 ieee80211_ht_node_join(struct ieee80211_node *ni)
1025 struct ieee80211com *ic = ni->ni_ic;
1027 IEEE80211_LOCK_ASSERT(ic);
1029 if (ni->ni_flags & IEEE80211_NODE_HT) {
1030 ic->ic_ht_sta_assoc++;
1031 if (ni->ni_chw == 40)
1032 ic->ic_ht40_sta_assoc++;
1038 * Handle an HT station leaving a BSS.
1041 ieee80211_ht_node_leave(struct ieee80211_node *ni)
1043 struct ieee80211com *ic = ni->ni_ic;
1045 IEEE80211_LOCK_ASSERT(ic);
1047 if (ni->ni_flags & IEEE80211_NODE_HT) {
1048 ic->ic_ht_sta_assoc--;
1049 if (ni->ni_chw == 40)
1050 ic->ic_ht40_sta_assoc--;
1056 * Public version of htinfo_update; used for processing
1057 * beacon frames from overlapping bss.
1059 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
1060 * (on receipt of a beacon that advertises MIXED) or
1061 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
1062 * from an overlapping legacy bss). We treat MIXED with
1063 * a higher precedence than PROTOPT (i.e. we will not change
1064 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
1065 * corresponds to how we handle things in htinfo_update.
1068 ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
1070 #define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE)
1071 if (protmode == ic->ic_curhtprotmode)
1073 if (OPMODE(ic->ic_curhtprotmode) == IEEE80211_HTINFO_OPMODE_MIXED &&
1074 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)
1077 /* track non-HT station presence */
1078 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
1079 ("missing NONHT_PRESENT"));
1080 ic->ic_flags_ext |= IEEE80211_FEXT_NONHT_PR;
1081 ic->ic_lastnonht = ticks;
1083 /* push beacon update */
1084 ic->ic_curhtprotmode = protmode;
1090 * Time out presence of an overlapping bss with non-HT
1091 * stations. When operating in hostap mode we listen for
1092 * beacons from other stations and if we identify a non-HT
1093 * station is present we update the opmode field of the
1094 * HTINFO ie. To identify when all non-HT stations are
1095 * gone we time out this condition.
1098 ieee80211_ht_timeout(struct ieee80211com *ic)
1100 IEEE80211_LOCK_ASSERT(ic);
1102 if ((ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) &&
1103 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
1105 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1106 "%s", "time out non-HT STA present on channel");
1108 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONHT_PR;
1113 /* unalligned little endian access */
1114 #define LE_READ_2(p) \
1116 ((((const uint8_t *)(p))[0] ) | \
1117 (((const uint8_t *)(p))[1] << 8)))
1120 * Process an 802.11n HT capabilities ie.
1123 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
1125 struct ieee80211vap *vap = ni->ni_vap;
1127 if (ie[0] == IEEE80211_ELEMID_VENDOR) {
1129 * Station used Vendor OUI ie to associate;
1130 * mark the node so when we respond we'll use
1131 * the Vendor OUI's and not the standard ie's.
1133 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
1136 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
1138 ni->ni_htcap = LE_READ_2(ie +
1139 __offsetof(struct ieee80211_ie_htcap, hc_cap));
1140 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
1141 /* XXX needed or will ieee80211_parse_htinfo always be called? */
1142 ni->ni_chw = (ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
1143 (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40) ? 40 : 20;
1147 * Process an 802.11n HT info ie and update the node state.
1148 * Note that we handle use this information to identify the
1149 * correct channel (HT20, HT40+, HT40-, legacy). The caller
1150 * is responsible for insuring any required channel change is
1151 * done (e.g. in sta mode when parsing the contents of a
1155 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
1157 struct ieee80211com *ic = ni->ni_ic;
1158 struct ieee80211vap *vap = ni->ni_vap;
1159 const struct ieee80211_ie_htinfo *htinfo;
1160 struct ieee80211_channel *c;
1162 int htflags, chanflags;
1164 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1166 htinfo = (const struct ieee80211_ie_htinfo *) ie;
1167 ni->ni_htctlchan = htinfo->hi_ctrlchannel;
1168 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
1169 w = LE_READ_2(&htinfo->hi_byte2);
1170 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
1171 w = LE_READ_2(&htinfo->hi_byte45);
1172 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
1174 * Handle 11n channel switch. Use the received HT ie's to
1175 * identify the right channel to use. If we cannot locate it
1176 * in the channel table then fallback to legacy operation.
1178 /* NB: honor operating mode constraint */
1179 htflags = (vap->iv_flags_ext & IEEE80211_FEXT_HT) ?
1180 IEEE80211_CHAN_HT20 : 0;
1181 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
1182 (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)) {
1183 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
1184 htflags = IEEE80211_CHAN_HT40U;
1185 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
1186 htflags = IEEE80211_CHAN_HT40D;
1188 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
1189 if (chanflags != ni->ni_chan->ic_flags) {
1190 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
1191 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
1193 * No HT40 channel entry in our table; fall back
1194 * to HT20 operation. This should not happen.
1196 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
1198 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1199 "no HT40 channel (freq %u), falling back to HT20",
1200 ni->ni_chan->ic_freq);
1203 if (c != NULL && c != ni->ni_chan) {
1205 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1206 "switch station to HT%d channel %u/0x%x",
1207 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
1208 c->ic_freq, c->ic_flags);
1211 /* NB: caller responsible for forcing any channel change */
1213 /* update node's tx channel width */
1214 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
1218 * Install received HT rate set by parsing the HT cap ie.
1221 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
1223 struct ieee80211vap *vap = ni->ni_vap;
1224 const struct ieee80211_ie_htcap *htcap;
1225 struct ieee80211_htrateset *rs;
1228 rs = &ni->ni_htrates;
1229 memset(rs, 0, sizeof(*rs));
1231 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1233 htcap = (const struct ieee80211_ie_htcap *) ie;
1234 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1235 if (isclr(htcap->hc_mcsset, i))
1237 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
1239 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1240 "WARNING, HT rate set too large; only "
1241 "using %u rates", IEEE80211_HTRATE_MAXSIZE);
1242 vap->iv_stats.is_rx_rstoobig++;
1245 rs->rs_rates[rs->rs_nrates++] = i;
1248 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
1252 * Mark rates in a node's HT rate set as basic according
1253 * to the information in the supplied HT info ie.
1256 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
1258 const struct ieee80211_ie_htinfo *htinfo;
1259 struct ieee80211_htrateset *rs;
1262 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1264 htinfo = (const struct ieee80211_ie_htinfo *) ie;
1265 rs = &ni->ni_htrates;
1266 if (rs->rs_nrates == 0) {
1267 IEEE80211_NOTE(ni->ni_vap,
1268 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1269 "%s", "WARNING, empty HT rate set");
1272 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1273 if (isclr(htinfo->hi_basicmcsset, i))
1275 for (j = 0; j < rs->rs_nrates; j++)
1276 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
1277 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
1282 addba_timeout(void *arg)
1284 struct ieee80211_tx_ampdu *tap = arg;
1287 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1288 tap->txa_attempts++;
1292 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
1294 /* XXX use CALLOUT_PENDING instead? */
1295 callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
1296 addba_timeout, tap);
1297 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
1298 tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
1302 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
1304 /* XXX use CALLOUT_PENDING instead? */
1305 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
1306 callout_stop(&tap->txa_timer);
1307 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1312 * Default method for requesting A-MPDU tx aggregation.
1313 * We setup the specified state block and start a timer
1314 * to wait for an ADDBA response frame.
1317 ieee80211_addba_request(struct ieee80211_node *ni,
1318 struct ieee80211_tx_ampdu *tap,
1319 int dialogtoken, int baparamset, int batimeout)
1324 tap->txa_token = dialogtoken;
1325 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
1326 tap->txa_start = tap->txa_seqstart = 0;
1327 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1328 tap->txa_wnd = (bufsiz == 0) ?
1329 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1330 addba_start_timeout(tap);
1335 * Default method for processing an A-MPDU tx aggregation
1336 * response. We shutdown any pending timer and update the
1337 * state block according to the reply.
1340 ieee80211_addba_response(struct ieee80211_node *ni,
1341 struct ieee80211_tx_ampdu *tap,
1342 int status, int baparamset, int batimeout)
1347 addba_stop_timeout(tap);
1348 if (status == IEEE80211_STATUS_SUCCESS) {
1349 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1350 /* XXX override our request? */
1351 tap->txa_wnd = (bufsiz == 0) ?
1352 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1353 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
1355 /* mark tid so we don't try again */
1356 tap->txa_flags |= IEEE80211_AGGR_NAK;
1362 * Default method for stopping A-MPDU tx aggregation.
1363 * Any timer is cleared and we drain any pending frames.
1366 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
1369 addba_stop_timeout(tap);
1370 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
1371 /* clear aggregation queue */
1372 ieee80211_drain_ifq(&tap->txa_q);
1373 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
1375 tap->txa_attempts = 0;
1379 * Process a received action frame using the default aggregation
1380 * policy. We intercept ADDBA-related frames and use them to
1381 * update our aggregation state. All other frames are passed up
1382 * for processing by ieee80211_recv_action.
1385 ieee80211_aggr_recv_action(struct ieee80211_node *ni,
1386 const uint8_t *frm, const uint8_t *efrm)
1388 struct ieee80211com *ic = ni->ni_ic;
1389 struct ieee80211vap *vap = ni->ni_vap;
1390 const struct ieee80211_action *ia;
1391 struct ieee80211_rx_ampdu *rap;
1392 struct ieee80211_tx_ampdu *tap;
1393 uint8_t dialogtoken;
1394 uint16_t baparamset, batimeout, baseqctl, code;
1396 int tid, ac, bufsiz;
1398 ia = (const struct ieee80211_action *) frm;
1399 switch (ia->ia_category) {
1400 case IEEE80211_ACTION_CAT_BA:
1401 switch (ia->ia_action) {
1402 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
1403 dialogtoken = frm[2];
1404 baparamset = LE_READ_2(frm+3);
1405 batimeout = LE_READ_2(frm+5);
1406 baseqctl = LE_READ_2(frm+7);
1408 tid = MS(baparamset, IEEE80211_BAPS_TID);
1409 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1412 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1413 "recv ADDBA request: dialogtoken %u "
1414 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d "
1416 dialogtoken, baparamset, tid, bufsiz, batimeout,
1417 MS(baseqctl, IEEE80211_BASEQ_START),
1418 MS(baseqctl, IEEE80211_BASEQ_FRAG));
1420 rap = &ni->ni_rx_ampdu[tid];
1422 /* Send ADDBA response */
1423 args[0] = dialogtoken;
1425 * NB: We ack only if the sta associated with HT and
1426 * the ap is configured to do AMPDU rx (the latter
1427 * violates the 11n spec and is mostly for testing).
1429 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
1430 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_RX)) {
1431 ampdu_rx_start(rap, bufsiz,
1432 MS(baseqctl, IEEE80211_BASEQ_START));
1434 args[1] = IEEE80211_STATUS_SUCCESS;
1437 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1438 ni, "reject ADDBA request: %s",
1439 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
1440 "administratively disabled" :
1441 "not negotiated for station");
1442 vap->iv_stats.is_addba_reject++;
1443 args[1] = IEEE80211_STATUS_UNSPECIFIED;
1445 /* XXX honor rap flags? */
1446 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
1447 | SM(tid, IEEE80211_BAPS_TID)
1448 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
1451 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1452 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
1455 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
1456 dialogtoken = frm[2];
1457 code = LE_READ_2(frm+3);
1458 baparamset = LE_READ_2(frm+5);
1459 tid = MS(baparamset, IEEE80211_BAPS_TID);
1460 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1461 batimeout = LE_READ_2(frm+7);
1463 ac = TID_TO_WME_AC(tid);
1464 tap = &ni->ni_tx_ampdu[ac];
1465 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
1466 IEEE80211_DISCARD_MAC(vap,
1467 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1468 ni->ni_macaddr, "ADDBA response",
1469 "no pending ADDBA, tid %d dialogtoken %u "
1470 "code %d", tid, dialogtoken, code);
1471 vap->iv_stats.is_addba_norequest++;
1474 if (dialogtoken != tap->txa_token) {
1475 IEEE80211_DISCARD_MAC(vap,
1476 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1477 ni->ni_macaddr, "ADDBA response",
1478 "dialogtoken mismatch: waiting for %d, "
1479 "received %d, tid %d code %d",
1480 tap->txa_token, dialogtoken, tid, code);
1481 vap->iv_stats.is_addba_badtoken++;
1486 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1487 "recv ADDBA response: dialogtoken %u code %d "
1488 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
1489 dialogtoken, code, baparamset, tid, bufsiz,
1491 ic->ic_addba_response(ni, tap,
1492 code, baparamset, batimeout);
1495 case IEEE80211_ACTION_BA_DELBA:
1496 baparamset = LE_READ_2(frm+2);
1497 code = LE_READ_2(frm+4);
1499 tid = MS(baparamset, IEEE80211_DELBAPS_TID);
1502 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1503 "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
1504 "code %d", baparamset, tid,
1505 MS(baparamset, IEEE80211_DELBAPS_INIT), code);
1507 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
1508 ac = TID_TO_WME_AC(tid);
1509 tap = &ni->ni_tx_ampdu[ac];
1510 ic->ic_addba_stop(ni, tap);
1512 rap = &ni->ni_rx_ampdu[tid];
1519 ieee80211_recv_action(ni, frm, efrm);
1523 * Process a received 802.11n action frame.
1524 * Aggregation-related frames are assumed to be handled
1525 * already; we handle any other frames we can, otherwise
1526 * complain about being unsupported (with debugging).
1529 ieee80211_recv_action(struct ieee80211_node *ni,
1530 const uint8_t *frm, const uint8_t *efrm)
1532 struct ieee80211vap *vap = ni->ni_vap;
1533 const struct ieee80211_action *ia;
1536 ia = (const struct ieee80211_action *) frm;
1537 switch (ia->ia_category) {
1538 case IEEE80211_ACTION_CAT_BA:
1540 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1541 "%s: BA action %d not implemented", __func__,
1543 vap->iv_stats.is_rx_mgtdiscard++;
1545 case IEEE80211_ACTION_CAT_HT:
1546 switch (ia->ia_action) {
1547 case IEEE80211_ACTION_HT_TXCHWIDTH:
1548 chw = frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040 ? 40 : 20;
1549 if (chw != ni->ni_chw) {
1551 ni->ni_flags |= IEEE80211_NODE_CHWUPDATE;
1554 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1555 "%s: HT txchwidth, width %d (%s)",
1557 ni->ni_flags & IEEE80211_NODE_CHWUPDATE ?
1558 "new" : "no change");
1560 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
1562 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1563 "%s: HT MIMO PS", __func__);
1567 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1568 "%s: HT action %d not implemented", __func__,
1570 vap->iv_stats.is_rx_mgtdiscard++;
1576 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1577 "%s: category %d not implemented", __func__,
1579 vap->iv_stats.is_rx_mgtdiscard++;
1585 * Transmit processing.
1589 * Check if A-MPDU should be requested/enabled for a stream.
1590 * We require a traffic rate above a per-AC threshold and we
1591 * also handle backoff from previous failed attempts.
1593 * Drivers may override this method to bring in information
1594 * such as link state conditions in making the decision.
1597 ieee80211_ampdu_enable(struct ieee80211_node *ni,
1598 struct ieee80211_tx_ampdu *tap)
1600 struct ieee80211vap *vap = ni->ni_vap;
1602 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac])
1604 /* XXX check rssi? */
1605 if (tap->txa_attempts >= ieee80211_addba_maxtries &&
1606 ticks < tap->txa_nextrequest) {
1608 * Don't retry too often; txa_nextrequest is set
1609 * to the minimum interval we'll retry after
1610 * ieee80211_addba_maxtries failed attempts are made.
1614 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1615 "%s: enable AMPDU on %s, avgpps %d pkts %d",
1616 __func__, ieee80211_wme_acnames[tap->txa_ac],
1617 tap->txa_avgpps, tap->txa_pkts);
1622 * Request A-MPDU tx aggregation. Setup local state and
1623 * issue an ADDBA request. BA use will only happen after
1624 * the other end replies with ADDBA response.
1627 ieee80211_ampdu_request(struct ieee80211_node *ni,
1628 struct ieee80211_tx_ampdu *tap)
1630 struct ieee80211com *ic = ni->ni_ic;
1632 int tid, dialogtoken;
1633 static int tokens = 0; /* XXX */
1636 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
1637 /* do deferred setup of state */
1638 IEEE80211_TAPQ_INIT(tap);
1639 callout_init(&tap->txa_timer, CALLOUT_MPSAFE);
1640 tap->txa_flags |= IEEE80211_AGGR_SETUP;
1642 /* XXX hack for not doing proper locking */
1643 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
1645 dialogtoken = (tokens+1) % 63; /* XXX */
1647 tid = WME_AC_TO_TID(tap->txa_ac);
1648 args[0] = dialogtoken;
1649 args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE
1650 | SM(tid, IEEE80211_BAPS_TID)
1651 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
1653 args[2] = 0; /* batimeout */
1654 /* NB: do first so there's no race against reply */
1655 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) {
1656 /* unable to setup state, don't make request */
1657 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1658 ni, "%s: could not setup BA stream for AC %d",
1659 __func__, tap->txa_ac);
1660 /* defer next try so we don't slam the driver with requests */
1661 tap->txa_attempts = ieee80211_addba_maxtries;
1662 /* NB: check in case driver wants to override */
1663 if (tap->txa_nextrequest <= ticks)
1664 tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
1667 tokens = dialogtoken; /* allocate token */
1668 /* NB: after calling ic_addba_request so driver can set seqstart */
1669 args[3] = SM(tap->txa_seqstart, IEEE80211_BASEQ_START)
1670 | SM(0, IEEE80211_BASEQ_FRAG)
1672 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1673 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
1677 * Terminate an AMPDU tx stream. State is reclaimed
1678 * and the peer notified with a DelBA Action frame.
1681 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
1683 struct ieee80211com *ic = ni->ni_ic;
1684 struct ieee80211vap *vap = ni->ni_vap;
1688 if (IEEE80211_AMPDU_RUNNING(tap)) {
1689 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1690 ni, "%s: stop BA stream for AC %d", __func__, tap->txa_ac);
1691 vap->iv_stats.is_ampdu_stop++;
1693 ic->ic_addba_stop(ni, tap);
1694 args[0] = WME_AC_TO_TID(tap->txa_ac);
1695 args[1] = IEEE80211_DELBAPS_INIT;
1696 args[2] = 1; /* XXX reason code */
1697 ieee80211_send_action(ni, IEEE80211_ACTION_CAT_BA,
1698 IEEE80211_ACTION_BA_DELBA, args);
1700 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1701 ni, "%s: BA stream for AC %d not running",
1702 __func__, tap->txa_ac);
1703 vap->iv_stats.is_ampdu_stop_failed++;
1708 * Transmit a BAR frame to the specified node. The
1709 * BAR contents are drawn from the supplied aggregation
1710 * state associated with the node.
1713 ieee80211_send_bar(struct ieee80211_node *ni,
1714 const struct ieee80211_tx_ampdu *tap)
1716 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
1717 #define ADDSHORT(frm, v) do { \
1718 frm[0] = (v) & 0xff; \
1719 frm[1] = (v) >> 8; \
1722 struct ieee80211vap *vap = ni->ni_vap;
1723 struct ieee80211com *ic = ni->ni_ic;
1724 struct ieee80211_frame_min *wh;
1727 uint16_t barctl, barseqctl;
1730 ieee80211_ref_node(ni);
1732 m = ieee80211_getmgtframe(&frm,
1733 ic->ic_headroom + sizeof(struct ieee80211_frame_min),
1734 sizeof(struct ieee80211_ba_request)
1737 senderr(ENOMEM, is_tx_nobuf);
1739 wh = mtod(m, struct ieee80211_frame_min *);
1740 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 |
1741 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
1743 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
1744 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1746 tid = WME_AC_TO_TID(tap->txa_ac);
1747 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
1748 IEEE80211_BAPS_POLICY_IMMEDIATE :
1749 IEEE80211_BAPS_POLICY_DELAYED)
1750 | SM(tid, IEEE80211_BAPS_TID)
1751 | SM(tap->txa_wnd, IEEE80211_BAPS_BUFSIZ)
1753 barseqctl = SM(tap->txa_start, IEEE80211_BASEQ_START)
1754 | SM(0, IEEE80211_BASEQ_FRAG)
1756 ADDSHORT(frm, barctl);
1757 ADDSHORT(frm, barseqctl);
1758 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1760 M_WME_SETAC(m, WME_AC_VO);
1762 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
1764 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
1765 ni, "send bar frame (tid %u start %u) on channel %u",
1766 tid, tap->txa_start, ieee80211_chan2ieee(ic, ic->ic_curchan));
1768 return ic->ic_raw_xmit(ni, m, NULL);
1770 ieee80211_free_node(ni);
1777 * Send an action management frame. The arguments are stuff
1778 * into a frame without inspection; the caller is assumed to
1779 * prepare them carefully (e.g. based on the aggregation state).
1782 ieee80211_send_action(struct ieee80211_node *ni,
1783 int category, int action, uint16_t args[4])
1785 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
1786 #define ADDSHORT(frm, v) do { \
1787 frm[0] = (v) & 0xff; \
1788 frm[1] = (v) >> 8; \
1791 struct ieee80211vap *vap = ni->ni_vap;
1792 struct ieee80211com *ic = ni->ni_ic;
1795 uint16_t baparamset;
1798 KASSERT(ni != NULL, ("null node"));
1801 * Hold a reference on the node so it doesn't go away until after
1802 * the xmit is complete all the way in the driver. On error we
1803 * will remove our reference.
1805 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1806 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
1808 ni, ether_sprintf(ni->ni_macaddr),
1809 ieee80211_node_refcnt(ni)+1);
1810 ieee80211_ref_node(ni);
1812 m = ieee80211_getmgtframe(&frm,
1813 ic->ic_headroom + sizeof(struct ieee80211_frame),
1814 sizeof(uint16_t) /* action+category */
1815 /* XXX may action payload */
1816 + sizeof(struct ieee80211_action_ba_addbaresponse)
1819 senderr(ENOMEM, is_tx_nobuf);
1824 case IEEE80211_ACTION_CAT_BA:
1826 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
1828 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1829 "send ADDBA request: dialogtoken %d "
1830 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
1831 args[0], args[1], MS(args[1], IEEE80211_BAPS_TID),
1834 *frm++ = args[0]; /* dialog token */
1835 ADDSHORT(frm, args[1]); /* baparamset */
1836 ADDSHORT(frm, args[2]); /* batimeout */
1837 ADDSHORT(frm, args[3]); /* baseqctl */
1839 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
1841 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1842 "send ADDBA response: dialogtoken %d status %d "
1843 "baparamset 0x%x (tid %d) batimeout %d",
1844 args[0], args[1], args[2],
1845 MS(args[2], IEEE80211_BAPS_TID), args[3]);
1847 *frm++ = args[0]; /* dialog token */
1848 ADDSHORT(frm, args[1]); /* statuscode */
1849 ADDSHORT(frm, args[2]); /* baparamset */
1850 ADDSHORT(frm, args[3]); /* batimeout */
1852 case IEEE80211_ACTION_BA_DELBA:
1854 baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
1855 | SM(args[1], IEEE80211_DELBAPS_INIT)
1857 ADDSHORT(frm, baparamset);
1858 ADDSHORT(frm, args[2]); /* reason code */
1861 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1862 "send DELBA action: tid %d, initiator %d reason %d",
1863 args[0], args[1], args[2]);
1869 case IEEE80211_ACTION_CAT_HT:
1871 case IEEE80211_ACTION_HT_TXCHWIDTH:
1873 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1874 ni, "send HT txchwidth: width %d",
1875 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20
1877 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
1878 IEEE80211_A_HT_TXCHWIDTH_2040 :
1879 IEEE80211_A_HT_TXCHWIDTH_20;
1888 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1889 "%s: unsupported category %d action %d", __func__,
1891 senderr(EINVAL, is_tx_unknownmgt);
1894 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1896 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION);
1898 ieee80211_free_node(ni);
1907 * Construct the MCS bit mask for inclusion
1908 * in an HT information element.
1911 ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
1915 for (i = 0; i < rs->rs_nrates; i++) {
1916 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
1917 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */
1918 /* NB: this assumes a particular implementation */
1925 * Add body of an HTCAP information element.
1928 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
1930 #define ADDSHORT(frm, v) do { \
1931 frm[0] = (v) & 0xff; \
1932 frm[1] = (v) >> 8; \
1935 struct ieee80211vap *vap = ni->ni_vap;
1939 /* HT capabilities */
1940 caps = vap->iv_htcaps & 0xffff;
1942 * Note channel width depends on whether we are operating as
1943 * a sta or not. When operating as a sta we are generating
1944 * a request based on our desired configuration. Otherwise
1945 * we are operational and the channel attributes identify
1946 * how we've been setup (which might be different if a fixed
1947 * channel is specified).
1949 if (vap->iv_opmode == IEEE80211_M_STA) {
1950 /* override 20/40 use based on config */
1951 if (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)
1952 caps |= IEEE80211_HTCAP_CHWIDTH40;
1954 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
1955 /* use advertised setting (XXX locally constraint) */
1956 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
1957 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
1959 /* override 20/40 use based on current channel */
1960 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
1961 caps |= IEEE80211_HTCAP_CHWIDTH40;
1963 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
1964 rxmax = vap->iv_ampdu_rxmax;
1965 density = vap->iv_ampdu_density;
1967 /* adjust short GI based on channel and config */
1968 if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20) == 0)
1969 caps &= ~IEEE80211_HTCAP_SHORTGI20;
1970 if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40) == 0 ||
1971 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
1972 caps &= ~IEEE80211_HTCAP_SHORTGI40;
1973 ADDSHORT(frm, caps);
1976 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
1977 | SM(density, IEEE80211_HTCAP_MPDUDENSITY)
1981 /* pre-zero remainder of ie */
1982 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
1983 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
1985 /* supported MCS set */
1987 * XXX it would better to get the rate set from ni_htrates
1988 * so we can restrict it but for sta mode ni_htrates isn't
1989 * setup when we're called to form an AssocReq frame so for
1990 * now we're restricted to the default HT rate set.
1992 ieee80211_set_htrates(frm, &ieee80211_rateset_11n);
1994 frm += sizeof(struct ieee80211_ie_htcap) -
1995 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
2001 * Add 802.11n HT capabilities information element
2004 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
2006 frm[0] = IEEE80211_ELEMID_HTCAP;
2007 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
2008 return ieee80211_add_htcap_body(frm + 2, ni);
2012 * Add Broadcom OUI wrapped standard HTCAP ie; this is
2013 * used for compatibility w/ pre-draft implementations.
2016 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
2018 frm[0] = IEEE80211_ELEMID_VENDOR;
2019 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
2020 frm[2] = (BCM_OUI >> 0) & 0xff;
2021 frm[3] = (BCM_OUI >> 8) & 0xff;
2022 frm[4] = (BCM_OUI >> 16) & 0xff;
2023 frm[5] = BCM_OUI_HTCAP;
2024 return ieee80211_add_htcap_body(frm + 6, ni);
2028 * Construct the MCS bit mask of basic rates
2029 * for inclusion in an HT information element.
2032 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
2036 for (i = 0; i < rs->rs_nrates; i++) {
2037 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
2038 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
2039 r < IEEE80211_HTRATE_MAXSIZE) {
2040 /* NB: this assumes a particular implementation */
2047 * Update the HTINFO ie for a beacon frame.
2050 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
2051 struct ieee80211_beacon_offsets *bo)
2053 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
2054 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan;
2055 struct ieee80211com *ic = vap->iv_ic;
2056 struct ieee80211_ie_htinfo *ht =
2057 (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
2059 /* XXX only update on channel change */
2060 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
2061 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
2062 if (IEEE80211_IS_CHAN_HT40U(bsschan))
2063 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2064 else if (IEEE80211_IS_CHAN_HT40D(bsschan))
2065 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2067 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
2068 if (IEEE80211_IS_CHAN_HT40(bsschan))
2069 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
2071 /* protection mode */
2072 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
2074 /* XXX propagate to vendor ie's */
2079 * Add body of an HTINFO information element.
2081 * NB: We don't use struct ieee80211_ie_htinfo because we can
2082 * be called to fillin both a standard ie and a compat ie that
2083 * has a vendor OUI at the front.
2086 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
2088 struct ieee80211com *ic = ni->ni_ic;
2090 /* pre-zero remainder of ie */
2091 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
2093 /* primary/control channel center */
2094 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
2096 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
2097 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
2098 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2099 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
2100 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2102 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
2103 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2104 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
2106 frm[1] = ic->ic_curhtprotmode;
2111 ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
2112 frm += sizeof(struct ieee80211_ie_htinfo) -
2113 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
2118 * Add 802.11n HT information information element.
2121 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
2123 frm[0] = IEEE80211_ELEMID_HTINFO;
2124 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
2125 return ieee80211_add_htinfo_body(frm + 2, ni);
2129 * Add Broadcom OUI wrapped standard HTINFO ie; this is
2130 * used for compatibility w/ pre-draft implementations.
2133 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
2135 frm[0] = IEEE80211_ELEMID_VENDOR;
2136 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
2137 frm[2] = (BCM_OUI >> 0) & 0xff;
2138 frm[3] = (BCM_OUI >> 8) & 0xff;
2139 frm[4] = (BCM_OUI >> 16) & 0xff;
2140 frm[5] = BCM_OUI_HTINFO;
2141 return ieee80211_add_htinfo_body(frm + 6, ni);