The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_ht.c

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    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: releng/8.0/sys/net80211/ieee80211_ht.c 195377 2009-07-05 17:59:19Z sam $");
   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/systm.h> 
   41 #include <sys/endian.h>
   42  
   43 #include <sys/socket.h>
   44 
   45 #include <net/if.h>
   46 #include <net/if_media.h>
   47 #include <net/ethernet.h>
   48 
   49 #include <net80211/ieee80211_var.h>
   50 #include <net80211/ieee80211_action.h>
   51 #include <net80211/ieee80211_input.h>
   52 
   53 /* define here, used throughout file */
   54 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
   55 #define SM(_v, _f)      (((_v) << _f##_S) & _f)
   56 
   57 const struct ieee80211_mcs_rates ieee80211_htrates[16] = {
   58         {  13,  14,  27,  30 }, /* MCS 0 */
   59         {  26,  29,  54,  60 }, /* MCS 1 */
   60         {  39,  43,  81,  90 }, /* MCS 2 */
   61         {  52,  58, 108, 120 }, /* MCS 3 */
   62         {  78,  87, 162, 180 }, /* MCS 4 */
   63         { 104, 116, 216, 240 }, /* MCS 5 */
   64         { 117, 130, 243, 270 }, /* MCS 6 */
   65         { 130, 144, 270, 300 }, /* MCS 7 */
   66         {  26,  29,  54,  60 }, /* MCS 8 */
   67         {  52,  58, 108, 120 }, /* MCS 9 */
   68         {  78,  87, 162, 180 }, /* MCS 10 */
   69         { 104, 116, 216, 240 }, /* MCS 11 */
   70         { 156, 173, 324, 360 }, /* MCS 12 */
   71         { 208, 231, 432, 480 }, /* MCS 13 */
   72         { 234, 260, 486, 540 }, /* MCS 14 */
   73         { 260, 289, 540, 600 }  /* MCS 15 */
   74 };
   75 
   76 static const struct ieee80211_htrateset ieee80211_rateset_11n =
   77         { 16, {
   78                   0,   1,   2,   3,   4,  5,   6,  7,  8,  9,
   79                  10,  11,  12,  13,  14,  15 }
   80         };
   81 
   82 #ifdef IEEE80211_AMPDU_AGE
   83 static  int ieee80211_ampdu_age = -1;   /* threshold for ampdu reorder q (ms) */
   84 SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW,
   85         &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I",
   86         "AMPDU max reorder age (ms)");
   87 #endif
   88 
   89 static  int ieee80211_recv_bar_ena = 1;
   90 SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena,
   91             0, "BAR frame processing (ena/dis)");
   92 
   93 static  int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */
   94 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW,
   95         &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
   96         "ADDBA request timeout (ms)");
   97 static  int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
   98 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW,
   99         &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
  100         "ADDBA request backoff (ms)");
  101 static  int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
  102 SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLTYPE_INT | CTLFLAG_RW,
  103         &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
  104 
  105 static  int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
  106 static  int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
  107 
  108 static  ieee80211_recv_action_func ht_recv_action_ba_addba_request;
  109 static  ieee80211_recv_action_func ht_recv_action_ba_addba_response;
  110 static  ieee80211_recv_action_func ht_recv_action_ba_delba;
  111 static  ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave;
  112 static  ieee80211_recv_action_func ht_recv_action_ht_txchwidth;
  113 
  114 static  ieee80211_send_action_func ht_send_action_ba_addba;
  115 static  ieee80211_send_action_func ht_send_action_ba_delba;
  116 static  ieee80211_send_action_func ht_send_action_ht_txchwidth;
  117 
  118 static void
  119 ieee80211_ht_init(void)
  120 {
  121         /*
  122          * Setup HT parameters that depends on the clock frequency.
  123          */
  124 #ifdef IEEE80211_AMPDU_AGE
  125         ieee80211_ampdu_age = msecs_to_ticks(500);
  126 #endif
  127         ieee80211_addba_timeout = msecs_to_ticks(250);
  128         ieee80211_addba_backoff = msecs_to_ticks(10*1000);
  129         ieee80211_bar_timeout = msecs_to_ticks(250);
  130         /*
  131          * Register action frame handlers.
  132          */
  133         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 
  134             IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request);
  135         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 
  136             IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response);
  137         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 
  138             IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba);
  139         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT, 
  140             IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave);
  141         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT, 
  142             IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth);
  143 
  144         ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 
  145             IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba);
  146         ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 
  147             IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba);
  148         ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 
  149             IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba);
  150         ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT, 
  151             IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth);
  152 }
  153 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL);
  154 
  155 static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
  156         struct ieee80211_tx_ampdu *tap);
  157 static int ieee80211_addba_request(struct ieee80211_node *ni,
  158         struct ieee80211_tx_ampdu *tap,
  159         int dialogtoken, int baparamset, int batimeout);
  160 static int ieee80211_addba_response(struct ieee80211_node *ni,
  161         struct ieee80211_tx_ampdu *tap,
  162         int code, int baparamset, int batimeout);
  163 static void ieee80211_addba_stop(struct ieee80211_node *ni,
  164         struct ieee80211_tx_ampdu *tap);
  165 static void ieee80211_bar_response(struct ieee80211_node *ni,
  166         struct ieee80211_tx_ampdu *tap, int status);
  167 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
  168 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
  169 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
  170         int baparamset, int batimeout, int baseqctl);
  171 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
  172 
  173 void
  174 ieee80211_ht_attach(struct ieee80211com *ic)
  175 {
  176         /* setup default aggregation policy */
  177         ic->ic_recv_action = ieee80211_recv_action;
  178         ic->ic_send_action = ieee80211_send_action;
  179         ic->ic_ampdu_enable = ieee80211_ampdu_enable;
  180         ic->ic_addba_request = ieee80211_addba_request;
  181         ic->ic_addba_response = ieee80211_addba_response;
  182         ic->ic_addba_stop = ieee80211_addba_stop;
  183         ic->ic_bar_response = ieee80211_bar_response;
  184         ic->ic_ampdu_rx_start = ampdu_rx_start;
  185         ic->ic_ampdu_rx_stop = ampdu_rx_stop;
  186 
  187         ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
  188         ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
  189 }
  190 
  191 void
  192 ieee80211_ht_detach(struct ieee80211com *ic)
  193 {
  194 }
  195 
  196 void
  197 ieee80211_ht_vattach(struct ieee80211vap *vap)
  198 {
  199 
  200         /* driver can override defaults */
  201         vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
  202         vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
  203         vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
  204         vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
  205         /* tx aggregation traffic thresholds */
  206         vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
  207         vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
  208         vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
  209         vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
  210 
  211         if (vap->iv_htcaps & IEEE80211_HTC_HT) {
  212                 /*
  213                  * Device is HT capable; enable all HT-related
  214                  * facilities by default.
  215                  * XXX these choices may be too aggressive.
  216                  */
  217                 vap->iv_flags_ht |= IEEE80211_FHT_HT
  218                                  |  IEEE80211_FHT_HTCOMPAT
  219                                  ;
  220                 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
  221                         vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
  222                 /* XXX infer from channel list? */
  223                 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
  224                         vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
  225                         if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
  226                                 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
  227                 }
  228                 /* enable RIFS if capable */
  229                 if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
  230                         vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
  231 
  232                 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
  233                 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
  234                 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
  235                         vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
  236                 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
  237                 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
  238                         vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
  239         }
  240         /* NB: disable default legacy WDS, too many issues right now */
  241         if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
  242                 vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
  243 }
  244 
  245 void
  246 ieee80211_ht_vdetach(struct ieee80211vap *vap)
  247 {
  248 }
  249 
  250 static void
  251 ht_announce(struct ieee80211com *ic, int mode,
  252         const struct ieee80211_htrateset *rs)
  253 {
  254         struct ifnet *ifp = ic->ic_ifp;
  255         int i, rate, mword;
  256 
  257         if_printf(ifp, "%s MCS: ", ieee80211_phymode_name[mode]);
  258         for (i = 0; i < rs->rs_nrates; i++) {
  259                 mword = ieee80211_rate2media(ic,
  260                     rs->rs_rates[i] | IEEE80211_RATE_MCS, mode);
  261                 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
  262                         continue;
  263                 rate = ieee80211_htrates[rs->rs_rates[i]].ht40_rate_400ns;
  264                 printf("%s%d%sMbps", (i != 0 ? " " : ""),
  265                     rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
  266         }
  267         printf("\n");
  268 }
  269 
  270 void
  271 ieee80211_ht_announce(struct ieee80211com *ic)
  272 {
  273         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
  274                 ht_announce(ic, IEEE80211_MODE_11NA, &ieee80211_rateset_11n);
  275         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
  276                 ht_announce(ic, IEEE80211_MODE_11NG, &ieee80211_rateset_11n);
  277 }
  278 
  279 const struct ieee80211_htrateset *
  280 ieee80211_get_suphtrates(struct ieee80211com *ic,
  281         const struct ieee80211_channel *c)
  282 {
  283         return &ieee80211_rateset_11n;
  284 }
  285 
  286 /*
  287  * Receive processing.
  288  */
  289 
  290 /*
  291  * Decap the encapsulated A-MSDU frames and dispatch all but
  292  * the last for delivery.  The last frame is returned for 
  293  * delivery via the normal path.
  294  */
  295 struct mbuf *
  296 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
  297 {
  298         struct ieee80211vap *vap = ni->ni_vap;
  299         int framelen;
  300         struct mbuf *n;
  301 
  302         /* discard 802.3 header inserted by ieee80211_decap */
  303         m_adj(m, sizeof(struct ether_header));
  304 
  305         vap->iv_stats.is_amsdu_decap++;
  306 
  307         for (;;) {
  308                 /*
  309                  * Decap the first frame, bust it apart from the
  310                  * remainder and deliver.  We leave the last frame
  311                  * delivery to the caller (for consistency with other
  312                  * code paths, could also do it here).
  313                  */
  314                 m = ieee80211_decap1(m, &framelen);
  315                 if (m == NULL) {
  316                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  317                             ni->ni_macaddr, "a-msdu", "%s", "decap failed");
  318                         vap->iv_stats.is_amsdu_tooshort++;
  319                         return NULL;
  320                 }
  321                 if (m->m_pkthdr.len == framelen)
  322                         break;
  323                 n = m_split(m, framelen, M_NOWAIT);
  324                 if (n == NULL) {
  325                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  326                             ni->ni_macaddr, "a-msdu",
  327                             "%s", "unable to split encapsulated frames");
  328                         vap->iv_stats.is_amsdu_split++;
  329                         m_freem(m);                     /* NB: must reclaim */
  330                         return NULL;
  331                 }
  332                 vap->iv_deliver_data(vap, ni, m);
  333 
  334                 /*
  335                  * Remove frame contents; each intermediate frame
  336                  * is required to be aligned to a 4-byte boundary.
  337                  */
  338                 m = n;
  339                 m_adj(m, roundup2(framelen, 4) - framelen);     /* padding */
  340         }
  341         return m;                               /* last delivered by caller */
  342 }
  343 
  344 /*
  345  * Purge all frames in the A-MPDU re-order queue.
  346  */
  347 static void
  348 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
  349 {
  350         struct mbuf *m;
  351         int i;
  352 
  353         for (i = 0; i < rap->rxa_wnd; i++) {
  354                 m = rap->rxa_m[i];
  355                 if (m != NULL) {
  356                         rap->rxa_m[i] = NULL;
  357                         rap->rxa_qbytes -= m->m_pkthdr.len;
  358                         m_freem(m);
  359                         if (--rap->rxa_qframes == 0)
  360                                 break;
  361                 }
  362         }
  363         KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
  364             ("lost %u data, %u frames on ampdu rx q",
  365             rap->rxa_qbytes, rap->rxa_qframes));
  366 }
  367 
  368 /*
  369  * Start A-MPDU rx/re-order processing for the specified TID.
  370  */
  371 static int
  372 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
  373         int baparamset, int batimeout, int baseqctl)
  374 {
  375         int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
  376 
  377         if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
  378                 /*
  379                  * AMPDU previously setup and not terminated with a DELBA,
  380                  * flush the reorder q's in case anything remains.
  381                  */
  382                 ampdu_rx_purge(rap);
  383         }
  384         memset(rap, 0, sizeof(*rap));
  385         rap->rxa_wnd = (bufsiz == 0) ?
  386             IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
  387         rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START);
  388         rap->rxa_flags |=  IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
  389 
  390         return 0;
  391 }
  392 
  393 /*
  394  * Stop A-MPDU rx processing for the specified TID.
  395  */
  396 static void
  397 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
  398 {
  399         ampdu_rx_purge(rap);
  400         rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
  401 }
  402 
  403 /*
  404  * Dispatch a frame from the A-MPDU reorder queue.  The
  405  * frame is fed back into ieee80211_input marked with an
  406  * M_AMPDU_MPDU flag so it doesn't come back to us (it also
  407  * permits ieee80211_input to optimize re-processing).
  408  */
  409 static __inline void
  410 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
  411 {
  412         m->m_flags |= M_AMPDU_MPDU;     /* bypass normal processing */
  413         /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
  414         (void) ieee80211_input(ni, m, 0, 0);
  415 }
  416 
  417 /*
  418  * Dispatch as many frames as possible from the re-order queue.
  419  * Frames will always be "at the front"; we process all frames
  420  * up to the first empty slot in the window.  On completion we
  421  * cleanup state if there are still pending frames in the current
  422  * BA window.  We assume the frame at slot 0 is already handled
  423  * by the caller; we always start at slot 1.
  424  */
  425 static void
  426 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
  427 {
  428         struct ieee80211vap *vap = ni->ni_vap;
  429         struct mbuf *m;
  430         int i;
  431 
  432         /* flush run of frames */
  433         for (i = 1; i < rap->rxa_wnd; i++) {
  434                 m = rap->rxa_m[i];
  435                 if (m == NULL)
  436                         break;
  437                 rap->rxa_m[i] = NULL;
  438                 rap->rxa_qbytes -= m->m_pkthdr.len;
  439                 rap->rxa_qframes--;
  440 
  441                 ampdu_dispatch(ni, m);
  442         }
  443         /*
  444          * If frames remain, copy the mbuf pointers down so
  445          * they correspond to the offsets in the new window.
  446          */
  447         if (rap->rxa_qframes != 0) {
  448                 int n = rap->rxa_qframes, j;
  449                 for (j = i+1; j < rap->rxa_wnd; j++) {
  450                         if (rap->rxa_m[j] != NULL) {
  451                                 rap->rxa_m[j-i] = rap->rxa_m[j];
  452                                 rap->rxa_m[j] = NULL;
  453                                 if (--n == 0)
  454                                         break;
  455                         }
  456                 }
  457                 KASSERT(n == 0, ("lost %d frames", n));
  458                 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
  459         }
  460         /*
  461          * Adjust the start of the BA window to
  462          * reflect the frames just dispatched.
  463          */
  464         rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
  465         vap->iv_stats.is_ampdu_rx_oor += i;
  466 }
  467 
  468 #ifdef IEEE80211_AMPDU_AGE
  469 /*
  470  * Dispatch all frames in the A-MPDU re-order queue.
  471  */
  472 static void
  473 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
  474 {
  475         struct ieee80211vap *vap = ni->ni_vap;
  476         struct mbuf *m;
  477         int i;
  478 
  479         for (i = 0; i < rap->rxa_wnd; i++) {
  480                 m = rap->rxa_m[i];
  481                 if (m == NULL)
  482                         continue;
  483                 rap->rxa_m[i] = NULL;
  484                 rap->rxa_qbytes -= m->m_pkthdr.len;
  485                 rap->rxa_qframes--;
  486                 vap->iv_stats.is_ampdu_rx_oor++;
  487 
  488                 ampdu_dispatch(ni, m);
  489                 if (rap->rxa_qframes == 0)
  490                         break;
  491         }
  492 }
  493 #endif /* IEEE80211_AMPDU_AGE */
  494 
  495 /*
  496  * Dispatch all frames in the A-MPDU re-order queue
  497  * preceding the specified sequence number.  This logic
  498  * handles window moves due to a received MSDU or BAR.
  499  */
  500 static void
  501 ampdu_rx_flush_upto(struct ieee80211_node *ni,
  502         struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
  503 {
  504         struct ieee80211vap *vap = ni->ni_vap;
  505         struct mbuf *m;
  506         ieee80211_seq seqno;
  507         int i;
  508 
  509         /*
  510          * Flush any complete MSDU's with a sequence number lower
  511          * than winstart.  Gaps may exist.  Note that we may actually
  512          * dispatch frames past winstart if a run continues; this is
  513          * an optimization that avoids having to do a separate pass
  514          * to dispatch frames after moving the BA window start.
  515          */
  516         seqno = rap->rxa_start;
  517         for (i = 0; i < rap->rxa_wnd; i++) {
  518                 m = rap->rxa_m[i];
  519                 if (m != NULL) {
  520                         rap->rxa_m[i] = NULL;
  521                         rap->rxa_qbytes -= m->m_pkthdr.len;
  522                         rap->rxa_qframes--;
  523                         vap->iv_stats.is_ampdu_rx_oor++;
  524 
  525                         ampdu_dispatch(ni, m);
  526                 } else {
  527                         if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
  528                                 break;
  529                 }
  530                 seqno = IEEE80211_SEQ_INC(seqno);
  531         }
  532         /*
  533          * If frames remain, copy the mbuf pointers down so
  534          * they correspond to the offsets in the new window.
  535          */
  536         if (rap->rxa_qframes != 0) {
  537                 int n = rap->rxa_qframes, j;
  538 
  539                 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
  540                 KASSERT(rap->rxa_m[0] == NULL,
  541                     ("%s: BA window slot 0 occupied", __func__));
  542                 for (j = i+1; j < rap->rxa_wnd; j++) {
  543                         if (rap->rxa_m[j] != NULL) {
  544                                 rap->rxa_m[j-i] = rap->rxa_m[j];
  545                                 rap->rxa_m[j] = NULL;
  546                                 if (--n == 0)
  547                                         break;
  548                         }
  549                 }
  550                 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
  551                     "BA win <%d:%d> winstart %d",
  552                     __func__, n, rap->rxa_qframes, i, rap->rxa_start,
  553                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  554                     winstart));
  555                 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
  556         }
  557         /*
  558          * Move the start of the BA window; we use the
  559          * sequence number of the last MSDU that was
  560          * passed up the stack+1 or winstart if stopped on
  561          * a gap in the reorder buffer.
  562          */
  563         rap->rxa_start = seqno;
  564 }
  565 
  566 /*
  567  * Process a received QoS data frame for an HT station.  Handle
  568  * A-MPDU reordering: if this frame is received out of order
  569  * and falls within the BA window hold onto it.  Otherwise if
  570  * this frame completes a run, flush any pending frames.  We
  571  * return 1 if the frame is consumed.  A 0 is returned if
  572  * the frame should be processed normally by the caller.
  573  */
  574 int
  575 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
  576 {
  577 #define IEEE80211_FC0_QOSDATA \
  578         (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
  579 #define PROCESS         0       /* caller should process frame */
  580 #define CONSUMED        1       /* frame consumed, caller does nothing */
  581         struct ieee80211vap *vap = ni->ni_vap;
  582         struct ieee80211_qosframe *wh;
  583         struct ieee80211_rx_ampdu *rap;
  584         ieee80211_seq rxseq;
  585         uint8_t tid;
  586         int off;
  587 
  588         KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
  589             ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
  590         KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
  591 
  592         /* NB: m_len known to be sufficient */
  593         wh = mtod(m, struct ieee80211_qosframe *);
  594         if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
  595                 /*
  596                  * Not QoS data, shouldn't get here but just
  597                  * return it to the caller for processing.
  598                  */
  599                 return PROCESS;
  600         }
  601         if (IEEE80211_IS_DSTODS(wh))
  602                 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
  603         else
  604                 tid = wh->i_qos[0];
  605         tid &= IEEE80211_QOS_TID;
  606         rap = &ni->ni_rx_ampdu[tid];
  607         if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
  608                 /*
  609                  * No ADDBA request yet, don't touch.
  610                  */
  611                 return PROCESS;
  612         }
  613         rxseq = le16toh(*(uint16_t *)wh->i_seq);
  614         if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
  615                 /*
  616                  * Fragments are not allowed; toss.
  617                  */
  618                 IEEE80211_DISCARD_MAC(vap,
  619                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
  620                     "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
  621                     wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
  622                 vap->iv_stats.is_ampdu_rx_drop++;
  623                 IEEE80211_NODE_STAT(ni, rx_drop);
  624                 m_freem(m);
  625                 return CONSUMED;
  626         }
  627         rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
  628         rap->rxa_nframes++;
  629 again:
  630         if (rxseq == rap->rxa_start) {
  631                 /*
  632                  * First frame in window.
  633                  */
  634                 if (rap->rxa_qframes != 0) {
  635                         /*
  636                          * Dispatch as many packets as we can.
  637                          */
  638                         KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
  639                         ampdu_dispatch(ni, m);
  640                         ampdu_rx_dispatch(rap, ni);
  641                         return CONSUMED;
  642                 } else {
  643                         /*
  644                          * In order; advance window and notify
  645                          * caller to dispatch directly.
  646                          */
  647                         rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
  648                         return PROCESS;
  649                 }
  650         }
  651         /*
  652          * Frame is out of order; store if in the BA window.
  653          */
  654         /* calculate offset in BA window */
  655         off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
  656         if (off < rap->rxa_wnd) {
  657                 /*
  658                  * Common case (hopefully): in the BA window.
  659                  * Sec 9.10.7.6 a) (D2.04 p.118 line 47)
  660                  */
  661 #ifdef IEEE80211_AMPDU_AGE
  662                 /* 
  663                  * Check for frames sitting too long in the reorder queue.
  664                  * This should only ever happen if frames are not delivered
  665                  * without the sender otherwise notifying us (e.g. with a
  666                  * BAR to move the window).  Typically this happens because
  667                  * of vendor bugs that cause the sequence number to jump.
  668                  * When this happens we get a gap in the reorder queue that
  669                  * leaves frame sitting on the queue until they get pushed
  670                  * out due to window moves.  When the vendor does not send
  671                  * BAR this move only happens due to explicit packet sends
  672                  *
  673                  * NB: we only track the time of the oldest frame in the
  674                  * reorder q; this means that if we flush we might push
  675                  * frames that still "new"; if this happens then subsequent
  676                  * frames will result in BA window moves which cost something
  677                  * but is still better than a big throughput dip.
  678                  */
  679                 if (rap->rxa_qframes != 0) {
  680                         /* XXX honor batimeout? */
  681                         if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
  682                                 /*
  683                                  * Too long since we received the first
  684                                  * frame; flush the reorder buffer.
  685                                  */
  686                                 if (rap->rxa_qframes != 0) {
  687                                         vap->iv_stats.is_ampdu_rx_age +=
  688                                             rap->rxa_qframes;
  689                                         ampdu_rx_flush(ni, rap);
  690                                 }
  691                                 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
  692                                 return PROCESS;
  693                         }
  694                 } else {
  695                         /*
  696                          * First frame, start aging timer.
  697                          */
  698                         rap->rxa_age = ticks;
  699                 }
  700 #endif /* IEEE80211_AMPDU_AGE */
  701                 /* save packet */
  702                 if (rap->rxa_m[off] == NULL) {
  703                         rap->rxa_m[off] = m;
  704                         rap->rxa_qframes++;
  705                         rap->rxa_qbytes += m->m_pkthdr.len;
  706                         vap->iv_stats.is_ampdu_rx_reorder++;
  707                 } else {
  708                         IEEE80211_DISCARD_MAC(vap,
  709                             IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
  710                             ni->ni_macaddr, "a-mpdu duplicate",
  711                             "seqno %u tid %u BA win <%u:%u>",
  712                             rxseq, tid, rap->rxa_start,
  713                             IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
  714                         vap->iv_stats.is_rx_dup++;
  715                         IEEE80211_NODE_STAT(ni, rx_dup);
  716                         m_freem(m);
  717                 }
  718                 return CONSUMED;
  719         }
  720         if (off < IEEE80211_SEQ_BA_RANGE) {
  721                 /*
  722                  * Outside the BA window, but within range;
  723                  * flush the reorder q and move the window.
  724                  * Sec 9.10.7.6 b) (D2.04 p.118 line 60)
  725                  */
  726                 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
  727                     "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
  728                     rap->rxa_start,
  729                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  730                     rap->rxa_qframes, rxseq, tid);
  731                 vap->iv_stats.is_ampdu_rx_move++;
  732 
  733                 /*
  734                  * The spec says to flush frames up to but not including:
  735                  *      WinStart_B = rxseq - rap->rxa_wnd + 1
  736                  * Then insert the frame or notify the caller to process
  737                  * it immediately.  We can safely do this by just starting
  738                  * over again because we know the frame will now be within
  739                  * the BA window.
  740                  */
  741                 /* NB: rxa_wnd known to be >0 */
  742                 ampdu_rx_flush_upto(ni, rap,
  743                     IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
  744                 goto again;
  745         } else {
  746                 /*
  747                  * Outside the BA window and out of range; toss.
  748                  * Sec 9.10.7.6 c) (D2.04 p.119 line 16)
  749                  */
  750                 IEEE80211_DISCARD_MAC(vap,
  751                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
  752                     "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
  753                     rap->rxa_start,
  754                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  755                     rap->rxa_qframes, rxseq, tid,
  756                     wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
  757                 vap->iv_stats.is_ampdu_rx_drop++;
  758                 IEEE80211_NODE_STAT(ni, rx_drop);
  759                 m_freem(m);
  760                 return CONSUMED;
  761         }
  762 #undef CONSUMED
  763 #undef PROCESS
  764 #undef IEEE80211_FC0_QOSDATA
  765 }
  766 
  767 /*
  768  * Process a BAR ctl frame.  Dispatch all frames up to
  769  * the sequence number of the frame.  If this frame is
  770  * out of range it's discarded.
  771  */
  772 void
  773 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
  774 {
  775         struct ieee80211vap *vap = ni->ni_vap;
  776         struct ieee80211_frame_bar *wh;
  777         struct ieee80211_rx_ampdu *rap;
  778         ieee80211_seq rxseq;
  779         int tid, off;
  780 
  781         if (!ieee80211_recv_bar_ena) {
  782 #if 0
  783                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
  784                     ni->ni_macaddr, "BAR", "%s", "processing disabled");
  785 #endif
  786                 vap->iv_stats.is_ampdu_bar_bad++;
  787                 return;
  788         }
  789         wh = mtod(m0, struct ieee80211_frame_bar *);
  790         /* XXX check basic BAR */
  791         tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
  792         rap = &ni->ni_rx_ampdu[tid];
  793         if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
  794                 /*
  795                  * No ADDBA request yet, don't touch.
  796                  */
  797                 IEEE80211_DISCARD_MAC(vap,
  798                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
  799                     ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
  800                 vap->iv_stats.is_ampdu_bar_bad++;
  801                 return;
  802         }
  803         vap->iv_stats.is_ampdu_bar_rx++;
  804         rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
  805         if (rxseq == rap->rxa_start)
  806                 return;
  807         /* calculate offset in BA window */
  808         off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
  809         if (off < IEEE80211_SEQ_BA_RANGE) {
  810                 /*
  811                  * Flush the reorder q up to rxseq and move the window.
  812                  * Sec 9.10.7.6 a) (D2.04 p.119 line 22)
  813                  */
  814                 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
  815                     "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
  816                     rap->rxa_start,
  817                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  818                     rap->rxa_qframes, rxseq, tid);
  819                 vap->iv_stats.is_ampdu_bar_move++;
  820 
  821                 ampdu_rx_flush_upto(ni, rap, rxseq);
  822                 if (off >= rap->rxa_wnd) {
  823                         /*
  824                          * BAR specifies a window start to the right of BA
  825                          * window; we must move it explicitly since
  826                          * ampdu_rx_flush_upto will not.
  827                          */
  828                         rap->rxa_start = rxseq;
  829                 }
  830         } else {
  831                 /*
  832                  * Out of range; toss.
  833                  * Sec 9.10.7.6 b) (D2.04 p.119 line 41)
  834                  */
  835                 IEEE80211_DISCARD_MAC(vap,
  836                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
  837                     "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
  838                     rap->rxa_start,
  839                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  840                     rap->rxa_qframes, rxseq, tid,
  841                     wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
  842                 vap->iv_stats.is_ampdu_bar_oow++;
  843                 IEEE80211_NODE_STAT(ni, rx_drop);
  844         }
  845 }
  846 
  847 /*
  848  * Setup HT-specific state in a node.  Called only
  849  * when HT use is negotiated so we don't do extra
  850  * work for temporary and/or legacy sta's.
  851  */
  852 void
  853 ieee80211_ht_node_init(struct ieee80211_node *ni)
  854 {
  855         struct ieee80211_tx_ampdu *tap;
  856         int ac;
  857 
  858         if (ni->ni_flags & IEEE80211_NODE_HT) {
  859                 /*
  860                  * Clean AMPDU state on re-associate.  This handles the case
  861                  * where a station leaves w/o notifying us and then returns
  862                  * before node is reaped for inactivity.
  863                  */
  864                 ieee80211_ht_node_cleanup(ni);
  865         }
  866         for (ac = 0; ac < WME_NUM_AC; ac++) {
  867                 tap = &ni->ni_tx_ampdu[ac];
  868                 tap->txa_ac = ac;
  869                 tap->txa_ni = ni;
  870                 /* NB: further initialization deferred */
  871         }
  872         ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
  873 }
  874 
  875 /*
  876  * Cleanup HT-specific state in a node.  Called only
  877  * when HT use has been marked.
  878  */
  879 void
  880 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
  881 {
  882         struct ieee80211com *ic = ni->ni_ic;
  883         int i;
  884 
  885         KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
  886 
  887         /* XXX optimize this */
  888         for (i = 0; i < WME_NUM_AC; i++) {
  889                 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
  890                 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
  891                         ampdu_tx_stop(tap);
  892         }
  893         for (i = 0; i < WME_NUM_TID; i++)
  894                 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
  895 
  896         ni->ni_htcap = 0;
  897         ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
  898 }
  899 
  900 /*
  901  * Age out HT resources for a station.
  902  */
  903 void
  904 ieee80211_ht_node_age(struct ieee80211_node *ni)
  905 {
  906 #ifdef IEEE80211_AMPDU_AGE
  907         struct ieee80211vap *vap = ni->ni_vap;
  908         uint8_t tid;
  909 #endif
  910 
  911         KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
  912 
  913 #ifdef IEEE80211_AMPDU_AGE
  914         for (tid = 0; tid < WME_NUM_TID; tid++) {
  915                 struct ieee80211_rx_ampdu *rap;
  916 
  917                 rap = &ni->ni_rx_ampdu[tid];
  918                 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
  919                         continue;
  920                 if (rap->rxa_qframes == 0)
  921                         continue;
  922                 /* 
  923                  * Check for frames sitting too long in the reorder queue.
  924                  * See above for more details on what's happening here.
  925                  */
  926                 /* XXX honor batimeout? */
  927                 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
  928                         /*
  929                          * Too long since we received the first
  930                          * frame; flush the reorder buffer.
  931                          */
  932                         vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
  933                         ampdu_rx_flush(ni, rap);
  934                 }
  935         }
  936 #endif /* IEEE80211_AMPDU_AGE */
  937 }
  938 
  939 static struct ieee80211_channel *
  940 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
  941 {
  942         return ieee80211_find_channel(ic, c->ic_freq,
  943             (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
  944 }
  945 
  946 /*
  947  * Adjust a channel to be HT/non-HT according to the vap's configuration.
  948  */
  949 struct ieee80211_channel *
  950 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
  951         struct ieee80211_channel *chan, int flags)
  952 {
  953         struct ieee80211_channel *c;
  954 
  955         if (flags & IEEE80211_FHT_HT) {
  956                 /* promote to HT if possible */
  957                 if (flags & IEEE80211_FHT_USEHT40) {
  958                         if (!IEEE80211_IS_CHAN_HT40(chan)) {
  959                                 /* NB: arbitrarily pick ht40+ over ht40- */
  960                                 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
  961                                 if (c == NULL)
  962                                         c = findhtchan(ic, chan,
  963                                                 IEEE80211_CHAN_HT40D);
  964                                 if (c == NULL)
  965                                         c = findhtchan(ic, chan,
  966                                                 IEEE80211_CHAN_HT20);
  967                                 if (c != NULL)
  968                                         chan = c;
  969                         }
  970                 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
  971                         c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
  972                         if (c != NULL)
  973                                 chan = c;
  974                 }
  975         } else if (IEEE80211_IS_CHAN_HT(chan)) {
  976                 /* demote to legacy, HT use is disabled */
  977                 c = ieee80211_find_channel(ic, chan->ic_freq,
  978                     chan->ic_flags &~ IEEE80211_CHAN_HT);
  979                 if (c != NULL)
  980                         chan = c;
  981         }
  982         return chan;
  983 }
  984 
  985 /*
  986  * Setup HT-specific state for a legacy WDS peer.
  987  */
  988 void
  989 ieee80211_ht_wds_init(struct ieee80211_node *ni)
  990 {
  991         struct ieee80211vap *vap = ni->ni_vap;
  992         struct ieee80211_tx_ampdu *tap;
  993         int ac;
  994 
  995         KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
  996 
  997         /* XXX check scan cache in case peer has an ap and we have info */
  998         /*
  999          * If setup with a legacy channel; locate an HT channel.
 1000          * Otherwise if the inherited channel (from a companion
 1001          * AP) is suitable use it so we use the same location
 1002          * for the extension channel).
 1003          */
 1004         ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
 1005             ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
 1006 
 1007         ni->ni_htcap = 0;
 1008         if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
 1009                 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
 1010         if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
 1011                 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
 1012                 ni->ni_chw = 40;
 1013                 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
 1014                         ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
 1015                 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
 1016                         ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
 1017                 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
 1018                         ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
 1019         } else {
 1020                 ni->ni_chw = 20;
 1021                 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
 1022         }
 1023         ni->ni_htctlchan = ni->ni_chan->ic_ieee;
 1024         if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
 1025                 ni->ni_flags |= IEEE80211_NODE_RIFS;
 1026         /* XXX does it make sense to enable SMPS? */
 1027 
 1028         ni->ni_htopmode = 0;            /* XXX need protection state */
 1029         ni->ni_htstbc = 0;              /* XXX need info */
 1030 
 1031         for (ac = 0; ac < WME_NUM_AC; ac++) {
 1032                 tap = &ni->ni_tx_ampdu[ac];
 1033                 tap->txa_ac = ac;
 1034         }
 1035         /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
 1036         ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
 1037 }
 1038 
 1039 /*
 1040  * Notify hostap vaps of a change in the HTINFO ie.
 1041  */
 1042 static void
 1043 htinfo_notify(struct ieee80211com *ic)
 1044 {
 1045         struct ieee80211vap *vap;
 1046         int first = 1;
 1047 
 1048         IEEE80211_LOCK_ASSERT(ic);
 1049 
 1050         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
 1051                 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
 1052                         continue;
 1053                 if (vap->iv_state != IEEE80211_S_RUN ||
 1054                     !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
 1055                         continue;
 1056                 if (first) {
 1057                         IEEE80211_NOTE(vap,
 1058                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
 1059                             vap->iv_bss,
 1060                             "HT bss occupancy change: %d sta, %d ht, "
 1061                             "%d ht40%s, HT protmode now 0x%x"
 1062                             , ic->ic_sta_assoc
 1063                             , ic->ic_ht_sta_assoc
 1064                             , ic->ic_ht40_sta_assoc
 1065                             , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ?
 1066                                  ", non-HT sta present" : ""
 1067                             , ic->ic_curhtprotmode);
 1068                         first = 0;
 1069                 }
 1070                 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
 1071         }
 1072 }
 1073 
 1074 /*
 1075  * Calculate HT protection mode from current
 1076  * state and handle updates.
 1077  */
 1078 static void
 1079 htinfo_update(struct ieee80211com *ic)
 1080 {
 1081         uint8_t protmode;
 1082 
 1083         if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
 1084                 protmode = IEEE80211_HTINFO_OPMODE_MIXED
 1085                          | IEEE80211_HTINFO_NONHT_PRESENT;
 1086         } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) {
 1087                 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
 1088                          | IEEE80211_HTINFO_NONHT_PRESENT;
 1089         } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
 1090             IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 
 1091             ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
 1092                 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
 1093         } else {
 1094                 protmode = IEEE80211_HTINFO_OPMODE_PURE;
 1095         }
 1096         if (protmode != ic->ic_curhtprotmode) {
 1097                 ic->ic_curhtprotmode = protmode;
 1098                 htinfo_notify(ic);
 1099         }
 1100 }
 1101 
 1102 /*
 1103  * Handle an HT station joining a BSS.
 1104  */
 1105 void
 1106 ieee80211_ht_node_join(struct ieee80211_node *ni)
 1107 {
 1108         struct ieee80211com *ic = ni->ni_ic;
 1109 
 1110         IEEE80211_LOCK_ASSERT(ic);
 1111 
 1112         if (ni->ni_flags & IEEE80211_NODE_HT) {
 1113                 ic->ic_ht_sta_assoc++;
 1114                 if (ni->ni_chw == 40)
 1115                         ic->ic_ht40_sta_assoc++;
 1116         }
 1117         htinfo_update(ic);
 1118 }
 1119 
 1120 /*
 1121  * Handle an HT station leaving a BSS.
 1122  */
 1123 void
 1124 ieee80211_ht_node_leave(struct ieee80211_node *ni)
 1125 {
 1126         struct ieee80211com *ic = ni->ni_ic;
 1127 
 1128         IEEE80211_LOCK_ASSERT(ic);
 1129 
 1130         if (ni->ni_flags & IEEE80211_NODE_HT) {
 1131                 ic->ic_ht_sta_assoc--;
 1132                 if (ni->ni_chw == 40)
 1133                         ic->ic_ht40_sta_assoc--;
 1134         }
 1135         htinfo_update(ic);
 1136 }
 1137 
 1138 /*
 1139  * Public version of htinfo_update; used for processing
 1140  * beacon frames from overlapping bss.
 1141  *
 1142  * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
 1143  * (on receipt of a beacon that advertises MIXED) or
 1144  * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
 1145  * from an overlapping legacy bss).  We treat MIXED with
 1146  * a higher precedence than PROTOPT (i.e. we will not change
 1147  * change PROTOPT -> MIXED; only MIXED -> PROTOPT).  This
 1148  * corresponds to how we handle things in htinfo_update.
 1149  */
 1150 void
 1151 ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
 1152 {
 1153 #define OPMODE(x)       SM(x, IEEE80211_HTINFO_OPMODE)
 1154         IEEE80211_LOCK(ic);
 1155 
 1156         /* track non-HT station presence */
 1157         KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
 1158             ("protmode 0x%x", protmode));
 1159         ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
 1160         ic->ic_lastnonht = ticks;
 1161 
 1162         if (protmode != ic->ic_curhtprotmode &&
 1163             (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
 1164              OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
 1165                 /* push beacon update */
 1166                 ic->ic_curhtprotmode = protmode;
 1167                 htinfo_notify(ic);
 1168         }
 1169         IEEE80211_UNLOCK(ic);
 1170 #undef OPMODE
 1171 }
 1172 
 1173 /*
 1174  * Time out presence of an overlapping bss with non-HT
 1175  * stations.  When operating in hostap mode we listen for
 1176  * beacons from other stations and if we identify a non-HT
 1177  * station is present we update the opmode field of the
 1178  * HTINFO ie.  To identify when all non-HT stations are
 1179  * gone we time out this condition.
 1180  */
 1181 void
 1182 ieee80211_ht_timeout(struct ieee80211com *ic)
 1183 {
 1184         IEEE80211_LOCK_ASSERT(ic);
 1185 
 1186         if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) &&
 1187             time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
 1188 #if 0
 1189                 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
 1190                     "%s", "time out non-HT STA present on channel");
 1191 #endif
 1192                 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
 1193                 htinfo_update(ic);
 1194         }
 1195 }
 1196 
 1197 /* unalligned little endian access */     
 1198 #define LE_READ_2(p)                                    \
 1199         ((uint16_t)                                     \
 1200          ((((const uint8_t *)(p))[0]      ) |           \
 1201           (((const uint8_t *)(p))[1] <<  8)))
 1202 
 1203 /*
 1204  * Process an 802.11n HT capabilities ie.
 1205  */
 1206 void
 1207 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
 1208 {
 1209         if (ie[0] == IEEE80211_ELEMID_VENDOR) {
 1210                 /*
 1211                  * Station used Vendor OUI ie to associate;
 1212                  * mark the node so when we respond we'll use
 1213                  * the Vendor OUI's and not the standard ie's.
 1214                  */
 1215                 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
 1216                 ie += 4;
 1217         } else
 1218                 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
 1219 
 1220         ni->ni_htcap = LE_READ_2(ie +
 1221                 __offsetof(struct ieee80211_ie_htcap, hc_cap));
 1222         ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
 1223 }
 1224 
 1225 static void
 1226 htinfo_parse(struct ieee80211_node *ni,
 1227         const struct ieee80211_ie_htinfo *htinfo)
 1228 {
 1229         uint16_t w;
 1230 
 1231         ni->ni_htctlchan = htinfo->hi_ctrlchannel;
 1232         ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
 1233         w = LE_READ_2(&htinfo->hi_byte2);
 1234         ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
 1235         w = LE_READ_2(&htinfo->hi_byte45);
 1236         ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
 1237 }
 1238 
 1239 /*
 1240  * Parse an 802.11n HT info ie and save useful information
 1241  * to the node state.  Note this does not effect any state
 1242  * changes such as for channel width change.
 1243  */
 1244 void
 1245 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
 1246 {
 1247         if (ie[0] == IEEE80211_ELEMID_VENDOR)
 1248                 ie += 4;
 1249         htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
 1250 }
 1251 
 1252 /*
 1253  * Handle 11n channel switch.  Use the received HT ie's to
 1254  * identify the right channel to use.  If we cannot locate it
 1255  * in the channel table then fallback to legacy operation.
 1256  * Note that we use this information to identify the node's
 1257  * channel only; the caller is responsible for insuring any
 1258  * required channel change is done (e.g. in sta mode when
 1259  * parsing the contents of a beacon frame).
 1260  */
 1261 static void
 1262 htinfo_update_chw(struct ieee80211_node *ni, int htflags)
 1263 {
 1264         struct ieee80211com *ic = ni->ni_ic;
 1265         struct ieee80211_channel *c;
 1266         int chanflags;
 1267 
 1268         chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
 1269         if (chanflags != ni->ni_chan->ic_flags) {
 1270                 /* XXX not right for ht40- */
 1271                 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
 1272                 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
 1273                         /*
 1274                          * No HT40 channel entry in our table; fall back
 1275                          * to HT20 operation.  This should not happen.
 1276                          */
 1277                         c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
 1278 #if 0
 1279                         IEEE80211_NOTE(ni->ni_vap,
 1280                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
 1281                             "no HT40 channel (freq %u), falling back to HT20",
 1282                             ni->ni_chan->ic_freq);
 1283 #endif
 1284                         /* XXX stat */
 1285                 }
 1286                 if (c != NULL && c != ni->ni_chan) {
 1287                         IEEE80211_NOTE(ni->ni_vap,
 1288                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
 1289                             "switch station to HT%d channel %u/0x%x",
 1290                             IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
 1291                             c->ic_freq, c->ic_flags);
 1292                         ni->ni_chan = c;
 1293                 }
 1294                 /* NB: caller responsible for forcing any channel change */
 1295         }
 1296         /* update node's tx channel width */
 1297         ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
 1298 }
 1299 
 1300 /*
 1301  * Update 11n MIMO PS state according to received htcap.
 1302  */
 1303 static __inline int
 1304 htcap_update_mimo_ps(struct ieee80211_node *ni)
 1305 {
 1306         uint16_t oflags = ni->ni_flags;
 1307 
 1308         switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
 1309         case IEEE80211_HTCAP_SMPS_DYNAMIC:
 1310                 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
 1311                 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
 1312                 break;
 1313         case IEEE80211_HTCAP_SMPS_ENA:
 1314                 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
 1315                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
 1316                 break;
 1317         case IEEE80211_HTCAP_SMPS_OFF:
 1318         default:                /* disable on rx of reserved value */
 1319                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
 1320                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
 1321                 break;
 1322         }
 1323         return (oflags ^ ni->ni_flags);
 1324 }
 1325 
 1326 /*
 1327  * Update short GI state according to received htcap
 1328  * and local settings.
 1329  */
 1330 static __inline void
 1331 htcap_update_shortgi(struct ieee80211_node *ni)
 1332 {
 1333         struct ieee80211vap *vap = ni->ni_vap;
 1334 
 1335         ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
 1336         if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
 1337             (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
 1338                 ni->ni_flags |= IEEE80211_NODE_SGI20;
 1339         if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
 1340             (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
 1341                 ni->ni_flags |= IEEE80211_NODE_SGI40;
 1342 }
 1343 
 1344 /*
 1345  * Parse and update HT-related state extracted from
 1346  * the HT cap and info ie's.
 1347  */
 1348 void
 1349 ieee80211_ht_updateparams(struct ieee80211_node *ni,
 1350         const uint8_t *htcapie, const uint8_t *htinfoie)
 1351 {
 1352         struct ieee80211vap *vap = ni->ni_vap;
 1353         const struct ieee80211_ie_htinfo *htinfo;
 1354         int htflags;
 1355 
 1356         ieee80211_parse_htcap(ni, htcapie);
 1357         if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
 1358                 htcap_update_mimo_ps(ni);
 1359         htcap_update_shortgi(ni);
 1360 
 1361         if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
 1362                 htinfoie += 4;
 1363         htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
 1364         htinfo_parse(ni, htinfo);
 1365 
 1366         htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
 1367             IEEE80211_CHAN_HT20 : 0;
 1368         /* NB: honor operating mode constraint */
 1369         if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
 1370             (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
 1371                 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
 1372                         htflags = IEEE80211_CHAN_HT40U;
 1373                 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
 1374                         htflags = IEEE80211_CHAN_HT40D;
 1375         }
 1376         htinfo_update_chw(ni, htflags);
 1377 
 1378         if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
 1379             (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
 1380                 ni->ni_flags |= IEEE80211_NODE_RIFS;
 1381         else
 1382                 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
 1383 }
 1384 
 1385 /*
 1386  * Parse and update HT-related state extracted from the HT cap ie
 1387  * for a station joining an HT BSS.
 1388  */
 1389 void
 1390 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
 1391 {
 1392         struct ieee80211vap *vap = ni->ni_vap;
 1393         int htflags;
 1394 
 1395         ieee80211_parse_htcap(ni, htcapie);
 1396         if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
 1397                 htcap_update_mimo_ps(ni);
 1398         htcap_update_shortgi(ni);
 1399 
 1400         /* NB: honor operating mode constraint */
 1401         /* XXX 40 MHZ intolerant */
 1402         htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
 1403             IEEE80211_CHAN_HT20 : 0;
 1404         if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
 1405             (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
 1406                 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
 1407                         htflags = IEEE80211_CHAN_HT40U;
 1408                 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
 1409                         htflags = IEEE80211_CHAN_HT40D;
 1410         }
 1411         htinfo_update_chw(ni, htflags);
 1412 }
 1413 
 1414 /*
 1415  * Install received HT rate set by parsing the HT cap ie.
 1416  */
 1417 int
 1418 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
 1419 {
 1420         struct ieee80211vap *vap = ni->ni_vap;
 1421         const struct ieee80211_ie_htcap *htcap;
 1422         struct ieee80211_htrateset *rs;
 1423         int i;
 1424 
 1425         rs = &ni->ni_htrates;
 1426         memset(rs, 0, sizeof(*rs));
 1427         if (ie != NULL) {
 1428                 if (ie[0] == IEEE80211_ELEMID_VENDOR)
 1429                         ie += 4;
 1430                 htcap = (const struct ieee80211_ie_htcap *) ie;
 1431                 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
 1432                         if (isclr(htcap->hc_mcsset, i))
 1433                                 continue;
 1434                         if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
 1435                                 IEEE80211_NOTE(vap,
 1436                                     IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
 1437                                     "WARNING, HT rate set too large; only "
 1438                                     "using %u rates", IEEE80211_HTRATE_MAXSIZE);
 1439                                 vap->iv_stats.is_rx_rstoobig++;
 1440                                 break;
 1441                         }
 1442                         rs->rs_rates[rs->rs_nrates++] = i;
 1443                 }
 1444         }
 1445         return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
 1446 }
 1447 
 1448 /*
 1449  * Mark rates in a node's HT rate set as basic according
 1450  * to the information in the supplied HT info ie.
 1451  */
 1452 void
 1453 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
 1454 {
 1455         const struct ieee80211_ie_htinfo *htinfo;
 1456         struct ieee80211_htrateset *rs;
 1457         int i, j;
 1458 
 1459         if (ie[0] == IEEE80211_ELEMID_VENDOR)
 1460                 ie += 4;
 1461         htinfo = (const struct ieee80211_ie_htinfo *) ie;
 1462         rs = &ni->ni_htrates;
 1463         if (rs->rs_nrates == 0) {
 1464                 IEEE80211_NOTE(ni->ni_vap,
 1465                     IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
 1466                     "%s", "WARNING, empty HT rate set");
 1467                 return;
 1468         }
 1469         for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
 1470                 if (isclr(htinfo->hi_basicmcsset, i))
 1471                         continue;
 1472                 for (j = 0; j < rs->rs_nrates; j++)
 1473                         if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
 1474                                 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
 1475         }
 1476 }
 1477 
 1478 static void
 1479 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
 1480 {
 1481         callout_init(&tap->txa_timer, CALLOUT_MPSAFE);
 1482         tap->txa_flags |= IEEE80211_AGGR_SETUP;
 1483 }
 1484 
 1485 static void
 1486 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
 1487 {
 1488         struct ieee80211_node *ni = tap->txa_ni;
 1489         struct ieee80211com *ic = ni->ni_ic;
 1490 
 1491         KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
 1492             ("txa_flags 0x%x ac %d", tap->txa_flags, tap->txa_ac));
 1493 
 1494         /*
 1495          * Stop BA stream if setup so driver has a chance
 1496          * to reclaim any resources it might have allocated.
 1497          */
 1498         ic->ic_addba_stop(ni, tap);
 1499         /*
 1500          * Stop any pending BAR transmit.
 1501          */
 1502         bar_stop_timer(tap);
 1503 
 1504         tap->txa_lastsample = 0;
 1505         tap->txa_avgpps = 0;
 1506         /* NB: clearing NAK means we may re-send ADDBA */ 
 1507         tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
 1508 }
 1509 
 1510 static void
 1511 addba_timeout(void *arg)
 1512 {
 1513         struct ieee80211_tx_ampdu *tap = arg;
 1514 
 1515         /* XXX ? */
 1516         tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
 1517         tap->txa_attempts++;
 1518 }
 1519 
 1520 static void
 1521 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
 1522 {
 1523         /* XXX use CALLOUT_PENDING instead? */
 1524         callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
 1525             addba_timeout, tap);
 1526         tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
 1527         tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
 1528 }
 1529 
 1530 static void
 1531 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
 1532 {
 1533         /* XXX use CALLOUT_PENDING instead? */
 1534         if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
 1535                 callout_stop(&tap->txa_timer);
 1536                 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
 1537         }
 1538 }
 1539 
 1540 /*
 1541  * Default method for requesting A-MPDU tx aggregation.
 1542  * We setup the specified state block and start a timer
 1543  * to wait for an ADDBA response frame.
 1544  */
 1545 static int
 1546 ieee80211_addba_request(struct ieee80211_node *ni,
 1547         struct ieee80211_tx_ampdu *tap,
 1548         int dialogtoken, int baparamset, int batimeout)
 1549 {
 1550         int bufsiz;
 1551 
 1552         /* XXX locking */
 1553         tap->txa_token = dialogtoken;
 1554         tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
 1555         bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
 1556         tap->txa_wnd = (bufsiz == 0) ?
 1557             IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
 1558         addba_start_timeout(tap);
 1559         return 1;
 1560 }
 1561 
 1562 /*
 1563  * Default method for processing an A-MPDU tx aggregation
 1564  * response.  We shutdown any pending timer and update the
 1565  * state block according to the reply.
 1566  */
 1567 static int
 1568 ieee80211_addba_response(struct ieee80211_node *ni,
 1569         struct ieee80211_tx_ampdu *tap,
 1570         int status, int baparamset, int batimeout)
 1571 {
 1572         int bufsiz, tid;
 1573 
 1574         /* XXX locking */
 1575         addba_stop_timeout(tap);
 1576         if (status == IEEE80211_STATUS_SUCCESS) {
 1577                 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
 1578                 /* XXX override our request? */
 1579                 tap->txa_wnd = (bufsiz == 0) ?
 1580                     IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
 1581                 /* XXX AC/TID */
 1582                 tid = MS(baparamset, IEEE80211_BAPS_TID);
 1583                 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
 1584                 tap->txa_attempts = 0;
 1585         } else {
 1586                 /* mark tid so we don't try again */
 1587                 tap->txa_flags |= IEEE80211_AGGR_NAK;
 1588         }
 1589         return 1;
 1590 }
 1591 
 1592 /*
 1593  * Default method for stopping A-MPDU tx aggregation.
 1594  * Any timer is cleared and we drain any pending frames.
 1595  */
 1596 static void
 1597 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
 1598 {
 1599         /* XXX locking */
 1600         addba_stop_timeout(tap);
 1601         if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
 1602                 /* XXX clear aggregation queue */
 1603                 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
 1604         }
 1605         tap->txa_attempts = 0;
 1606 }
 1607 
 1608 /*
 1609  * Process a received action frame using the default aggregation
 1610  * policy.  We intercept ADDBA-related frames and use them to
 1611  * update our aggregation state.  All other frames are passed up
 1612  * for processing by ieee80211_recv_action.
 1613  */
 1614 static int
 1615 ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
 1616         const struct ieee80211_frame *wh,
 1617         const uint8_t *frm, const uint8_t *efrm)
 1618 {
 1619         struct ieee80211com *ic = ni->ni_ic;
 1620         struct ieee80211vap *vap = ni->ni_vap;
 1621         struct ieee80211_rx_ampdu *rap;
 1622         uint8_t dialogtoken;
 1623         uint16_t baparamset, batimeout, baseqctl;
 1624         uint16_t args[4];
 1625         int tid;
 1626 
 1627         dialogtoken = frm[2];
 1628         baparamset = LE_READ_2(frm+3);
 1629         batimeout = LE_READ_2(frm+5);
 1630         baseqctl = LE_READ_2(frm+7);
 1631 
 1632         tid = MS(baparamset, IEEE80211_BAPS_TID);
 1633 
 1634         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 1635             "recv ADDBA request: dialogtoken %u baparamset 0x%x "
 1636             "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d",
 1637             dialogtoken, baparamset,
 1638             tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ),
 1639             batimeout,
 1640             MS(baseqctl, IEEE80211_BASEQ_START),
 1641             MS(baseqctl, IEEE80211_BASEQ_FRAG));
 1642 
 1643         rap = &ni->ni_rx_ampdu[tid];
 1644 
 1645         /* Send ADDBA response */
 1646         args[0] = dialogtoken;
 1647         /*
 1648          * NB: We ack only if the sta associated with HT and
 1649          * the ap is configured to do AMPDU rx (the latter
 1650          * violates the 11n spec and is mostly for testing).
 1651          */
 1652         if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
 1653             (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
 1654                 /* XXX handle ampdu_rx_start failure */
 1655                 ic->ic_ampdu_rx_start(ni, rap,
 1656                     baparamset, batimeout, baseqctl);
 1657 
 1658                 args[1] = IEEE80211_STATUS_SUCCESS;
 1659         } else {
 1660                 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1661                     ni, "reject ADDBA request: %s",
 1662                     ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
 1663                        "administratively disabled" :
 1664                        "not negotiated for station");
 1665                 vap->iv_stats.is_addba_reject++;
 1666                 args[1] = IEEE80211_STATUS_UNSPECIFIED;
 1667         }
 1668         /* XXX honor rap flags? */
 1669         args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
 1670                 | SM(tid, IEEE80211_BAPS_TID)
 1671                 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
 1672                 ;
 1673         args[3] = 0;
 1674         ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
 1675                 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
 1676         return 0;
 1677 }
 1678 
 1679 static int
 1680 ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
 1681         const struct ieee80211_frame *wh,
 1682         const uint8_t *frm, const uint8_t *efrm)
 1683 {
 1684         struct ieee80211com *ic = ni->ni_ic;
 1685         struct ieee80211vap *vap = ni->ni_vap;
 1686         struct ieee80211_tx_ampdu *tap;
 1687         uint8_t dialogtoken, policy;
 1688         uint16_t baparamset, batimeout, code;
 1689         int tid, ac, bufsiz;
 1690 
 1691         dialogtoken = frm[2];
 1692         code = LE_READ_2(frm+3);
 1693         baparamset = LE_READ_2(frm+5);
 1694         tid = MS(baparamset, IEEE80211_BAPS_TID);
 1695         bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
 1696         policy = MS(baparamset, IEEE80211_BAPS_POLICY);
 1697         batimeout = LE_READ_2(frm+7);
 1698 
 1699         ac = TID_TO_WME_AC(tid);
 1700         tap = &ni->ni_tx_ampdu[ac];
 1701         if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
 1702                 IEEE80211_DISCARD_MAC(vap,
 1703                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1704                     ni->ni_macaddr, "ADDBA response",
 1705                     "no pending ADDBA, tid %d dialogtoken %u "
 1706                     "code %d", tid, dialogtoken, code);
 1707                 vap->iv_stats.is_addba_norequest++;
 1708                 return 0;
 1709         }
 1710         if (dialogtoken != tap->txa_token) {
 1711                 IEEE80211_DISCARD_MAC(vap,
 1712                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1713                     ni->ni_macaddr, "ADDBA response",
 1714                     "dialogtoken mismatch: waiting for %d, "
 1715                     "received %d, tid %d code %d",
 1716                     tap->txa_token, dialogtoken, tid, code);
 1717                 vap->iv_stats.is_addba_badtoken++;
 1718                 return 0;
 1719         }
 1720         /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
 1721         if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
 1722                 IEEE80211_DISCARD_MAC(vap,
 1723                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1724                     ni->ni_macaddr, "ADDBA response",
 1725                     "policy mismatch: expecting %s, "
 1726                     "received %s, tid %d code %d",
 1727                     tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
 1728                     policy, tid, code);
 1729                 vap->iv_stats.is_addba_badpolicy++;
 1730                 return 0;
 1731         }
 1732 #if 0
 1733         /* XXX we take MIN in ieee80211_addba_response */
 1734         if (bufsiz > IEEE80211_AGGR_BAWMAX) {
 1735                 IEEE80211_DISCARD_MAC(vap,
 1736                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1737                     ni->ni_macaddr, "ADDBA response",
 1738                     "BA window too large: max %d, "
 1739                     "received %d, tid %d code %d",
 1740                     bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
 1741                 vap->iv_stats.is_addba_badbawinsize++;
 1742                 return 0;
 1743         }
 1744 #endif
 1745         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 1746             "recv ADDBA response: dialogtoken %u code %d "
 1747             "baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
 1748             dialogtoken, code, baparamset, tid, bufsiz,
 1749             batimeout);
 1750         ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
 1751         return 0;
 1752 }
 1753 
 1754 static int
 1755 ht_recv_action_ba_delba(struct ieee80211_node *ni,
 1756         const struct ieee80211_frame *wh,
 1757         const uint8_t *frm, const uint8_t *efrm)
 1758 {
 1759         struct ieee80211com *ic = ni->ni_ic;
 1760         struct ieee80211_rx_ampdu *rap;
 1761         struct ieee80211_tx_ampdu *tap;
 1762         uint16_t baparamset, code;
 1763         int tid, ac;
 1764 
 1765         baparamset = LE_READ_2(frm+2);
 1766         code = LE_READ_2(frm+4);
 1767 
 1768         tid = MS(baparamset, IEEE80211_DELBAPS_TID);
 1769 
 1770         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 1771             "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
 1772             "code %d", baparamset, tid,
 1773             MS(baparamset, IEEE80211_DELBAPS_INIT), code);
 1774 
 1775         if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
 1776                 ac = TID_TO_WME_AC(tid);
 1777                 tap = &ni->ni_tx_ampdu[ac];
 1778                 ic->ic_addba_stop(ni, tap);
 1779         } else {
 1780                 rap = &ni->ni_rx_ampdu[tid];
 1781                 ic->ic_ampdu_rx_stop(ni, rap);
 1782         }
 1783         return 0;
 1784 }
 1785 
 1786 static int
 1787 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
 1788         const struct ieee80211_frame *wh,
 1789         const uint8_t *frm, const uint8_t *efrm)
 1790 {
 1791         int chw;
 1792 
 1793         chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20;
 1794 
 1795         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 1796             "%s: HT txchwidth, width %d%s",
 1797             __func__, chw, ni->ni_chw != chw ? "*" : "");
 1798         if (chw != ni->ni_chw) {
 1799                 ni->ni_chw = chw;
 1800                 /* XXX notify on change */
 1801         }
 1802         return 0;
 1803 }
 1804 
 1805 static int
 1806 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
 1807         const struct ieee80211_frame *wh,
 1808         const uint8_t *frm, const uint8_t *efrm)
 1809 {
 1810         const struct ieee80211_action_ht_mimopowersave *mps =
 1811             (const struct ieee80211_action_ht_mimopowersave *) frm;
 1812 
 1813         /* XXX check iv_htcaps */
 1814         if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
 1815                 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
 1816         else
 1817                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
 1818         if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
 1819                 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
 1820         else
 1821                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
 1822         /* XXX notify on change */
 1823         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 1824             "%s: HT MIMO PS (%s%s)", __func__,
 1825             (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ?  "on" : "off",
 1826             (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ?  "+rts" : ""
 1827         );
 1828         return 0;
 1829 }
 1830 
 1831 /*
 1832  * Transmit processing.
 1833  */
 1834 
 1835 /*
 1836  * Check if A-MPDU should be requested/enabled for a stream.
 1837  * We require a traffic rate above a per-AC threshold and we
 1838  * also handle backoff from previous failed attempts.
 1839  *
 1840  * Drivers may override this method to bring in information
 1841  * such as link state conditions in making the decision.
 1842  */
 1843 static int
 1844 ieee80211_ampdu_enable(struct ieee80211_node *ni,
 1845         struct ieee80211_tx_ampdu *tap)
 1846 {
 1847         struct ieee80211vap *vap = ni->ni_vap;
 1848 
 1849         if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac])
 1850                 return 0;
 1851         /* XXX check rssi? */
 1852         if (tap->txa_attempts >= ieee80211_addba_maxtries &&
 1853             ticks < tap->txa_nextrequest) {
 1854                 /*
 1855                  * Don't retry too often; txa_nextrequest is set
 1856                  * to the minimum interval we'll retry after
 1857                  * ieee80211_addba_maxtries failed attempts are made.
 1858                  */
 1859                 return 0;
 1860         }
 1861         IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
 1862             "enable AMPDU on %s, avgpps %d pkts %d",
 1863             ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts);
 1864         return 1;
 1865 }
 1866 
 1867 /*
 1868  * Request A-MPDU tx aggregation.  Setup local state and
 1869  * issue an ADDBA request.  BA use will only happen after
 1870  * the other end replies with ADDBA response.
 1871  */
 1872 int
 1873 ieee80211_ampdu_request(struct ieee80211_node *ni,
 1874         struct ieee80211_tx_ampdu *tap)
 1875 {
 1876         struct ieee80211com *ic = ni->ni_ic;
 1877         uint16_t args[4];
 1878         int tid, dialogtoken;
 1879         static int tokens = 0;  /* XXX */
 1880 
 1881         /* XXX locking */
 1882         if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
 1883                 /* do deferred setup of state */
 1884                 ampdu_tx_setup(tap);
 1885         }
 1886         /* XXX hack for not doing proper locking */
 1887         tap->txa_flags &= ~IEEE80211_AGGR_NAK;
 1888 
 1889         dialogtoken = (tokens+1) % 63;          /* XXX */
 1890         tid = WME_AC_TO_TID(tap->txa_ac);
 1891         tap->txa_start = ni->ni_txseqs[tid];
 1892 
 1893         args[0] = dialogtoken;
 1894         args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE
 1895                 | SM(tid, IEEE80211_BAPS_TID)
 1896                 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
 1897                 ;
 1898         args[2] = 0;    /* batimeout */
 1899         /* NB: do first so there's no race against reply */
 1900         if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) {
 1901                 /* unable to setup state, don't make request */
 1902                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 1903                     ni, "%s: could not setup BA stream for AC %d",
 1904                     __func__, tap->txa_ac);
 1905                 /* defer next try so we don't slam the driver with requests */
 1906                 tap->txa_attempts = ieee80211_addba_maxtries;
 1907                 /* NB: check in case driver wants to override */
 1908                 if (tap->txa_nextrequest <= ticks)
 1909                         tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
 1910                 return 0;
 1911         }
 1912         tokens = dialogtoken;                   /* allocate token */
 1913         /* NB: after calling ic_addba_request so driver can set txa_start */
 1914         args[3] = SM(tap->txa_start, IEEE80211_BASEQ_START)
 1915                 | SM(0, IEEE80211_BASEQ_FRAG)
 1916                 ;
 1917         return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
 1918                 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
 1919 }
 1920 
 1921 /*
 1922  * Terminate an AMPDU tx stream.  State is reclaimed
 1923  * and the peer notified with a DelBA Action frame.
 1924  */
 1925 void
 1926 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
 1927         int reason)
 1928 {
 1929         struct ieee80211com *ic = ni->ni_ic;
 1930         struct ieee80211vap *vap = ni->ni_vap;
 1931         uint16_t args[4];
 1932 
 1933         /* XXX locking */
 1934         tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
 1935         if (IEEE80211_AMPDU_RUNNING(tap)) {
 1936                 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1937                     ni, "%s: stop BA stream for AC %d (reason %d)",
 1938                     __func__, tap->txa_ac, reason);
 1939                 vap->iv_stats.is_ampdu_stop++;
 1940 
 1941                 ic->ic_addba_stop(ni, tap);
 1942                 args[0] = WME_AC_TO_TID(tap->txa_ac);
 1943                 args[1] = IEEE80211_DELBAPS_INIT;
 1944                 args[2] = reason;                       /* XXX reason code */
 1945                 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
 1946                         IEEE80211_ACTION_BA_DELBA, args);
 1947         } else {
 1948                 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1949                     ni, "%s: BA stream for AC %d not running (reason %d)",
 1950                     __func__, tap->txa_ac, reason);
 1951                 vap->iv_stats.is_ampdu_stop_failed++;
 1952         }
 1953 }
 1954 
 1955 static void
 1956 bar_timeout(void *arg)
 1957 {
 1958         struct ieee80211_tx_ampdu *tap = arg;
 1959         struct ieee80211_node *ni = tap->txa_ni;
 1960 
 1961         KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
 1962             ("bar/addba collision, flags 0x%x", tap->txa_flags));
 1963 
 1964         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 1965             ni, "%s: tid %u flags 0x%x attempts %d", __func__,
 1966             tap->txa_ac, tap->txa_flags, tap->txa_attempts);
 1967 
 1968         /* guard against race with bar_tx_complete */
 1969         if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
 1970                 return;
 1971         /* XXX ? */
 1972         if (tap->txa_attempts >= ieee80211_bar_maxtries)
 1973                 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
 1974         else
 1975                 ieee80211_send_bar(ni, tap, tap->txa_seqpending);
 1976 }
 1977 
 1978 static void
 1979 bar_start_timer(struct ieee80211_tx_ampdu *tap)
 1980 {
 1981         callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
 1982 }
 1983 
 1984 static void
 1985 bar_stop_timer(struct ieee80211_tx_ampdu *tap)
 1986 {
 1987         callout_stop(&tap->txa_timer);
 1988 }
 1989 
 1990 static void
 1991 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
 1992 {
 1993         struct ieee80211_tx_ampdu *tap = arg;
 1994 
 1995         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 1996             ni, "%s: tid %u flags 0x%x pending %d status %d",
 1997             __func__, tap->txa_ac, tap->txa_flags,
 1998             callout_pending(&tap->txa_timer), status);
 1999 
 2000         /* XXX locking */
 2001         if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
 2002             callout_pending(&tap->txa_timer)) {
 2003                 struct ieee80211com *ic = ni->ni_ic;
 2004 
 2005                 if (status)             /* ACK'd */
 2006                         bar_stop_timer(tap);
 2007                 ic->ic_bar_response(ni, tap, status);
 2008                 /* NB: just let timer expire so we pace requests */
 2009         }
 2010 }
 2011 
 2012 static void
 2013 ieee80211_bar_response(struct ieee80211_node *ni,
 2014         struct ieee80211_tx_ampdu *tap, int status)
 2015 {
 2016 
 2017         if (status != 0) {              /* got ACK */
 2018                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2019                     ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
 2020                     tap->txa_start,
 2021                     IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
 2022                     tap->txa_qframes, tap->txa_seqpending,
 2023                     WME_AC_TO_TID(tap->txa_ac));
 2024 
 2025                 /* NB: timer already stopped in bar_tx_complete */
 2026                 tap->txa_start = tap->txa_seqpending;
 2027                 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
 2028         }
 2029 }
 2030 
 2031 /*
 2032  * Transmit a BAR frame to the specified node.  The
 2033  * BAR contents are drawn from the supplied aggregation
 2034  * state associated with the node.
 2035  *
 2036  * NB: we only handle immediate ACK w/ compressed bitmap.
 2037  */
 2038 int
 2039 ieee80211_send_bar(struct ieee80211_node *ni,
 2040         struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
 2041 {
 2042 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
 2043         struct ieee80211vap *vap = ni->ni_vap;
 2044         struct ieee80211com *ic = ni->ni_ic;
 2045         struct ieee80211_frame_bar *bar;
 2046         struct mbuf *m;
 2047         uint16_t barctl, barseqctl;
 2048         uint8_t *frm;
 2049         int tid, ret;
 2050 
 2051         if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
 2052                 /* no ADDBA response, should not happen */
 2053                 /* XXX stat+msg */
 2054                 return EINVAL;
 2055         }
 2056         /* XXX locking */
 2057         bar_stop_timer(tap);
 2058 
 2059         ieee80211_ref_node(ni);
 2060 
 2061         m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
 2062         if (m == NULL)
 2063                 senderr(ENOMEM, is_tx_nobuf);
 2064 
 2065         if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
 2066                 m_freem(m);
 2067                 senderr(ENOMEM, is_tx_nobuf);   /* XXX */
 2068                 /* NOTREACHED */
 2069         }
 2070 
 2071         bar = mtod(m, struct ieee80211_frame_bar *);
 2072         bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
 2073                 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
 2074         bar->i_fc[1] = 0;
 2075         IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
 2076         IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
 2077 
 2078         tid = WME_AC_TO_TID(tap->txa_ac);
 2079         barctl  = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
 2080                         0 : IEEE80211_BAR_NOACK)
 2081                 | IEEE80211_BAR_COMP
 2082                 | SM(tid, IEEE80211_BAR_TID)
 2083                 ;
 2084         barseqctl = SM(seq, IEEE80211_BAR_SEQ_START);
 2085         /* NB: known to have proper alignment */
 2086         bar->i_ctl = htole16(barctl);
 2087         bar->i_seq = htole16(barseqctl);
 2088         m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
 2089 
 2090         M_WME_SETAC(m, WME_AC_VO);
 2091 
 2092         IEEE80211_NODE_STAT(ni, tx_mgmt);       /* XXX tx_ctl? */
 2093 
 2094         /* XXX locking */
 2095         /* init/bump attempts counter */
 2096         if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
 2097                 tap->txa_attempts = 1;
 2098         else
 2099                 tap->txa_attempts++;
 2100         tap->txa_seqpending = seq;
 2101         tap->txa_flags |= IEEE80211_AGGR_BARPEND;
 2102 
 2103         IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
 2104             ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
 2105             tid, barctl, seq, tap->txa_attempts);
 2106 
 2107         ret = ic->ic_raw_xmit(ni, m, NULL);
 2108         if (ret != 0) {
 2109                 /* xmit failed, clear state flag */
 2110                 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
 2111                 goto bad;
 2112         }
 2113         /* XXX hack against tx complete happening before timer is started */
 2114         if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
 2115                 bar_start_timer(tap);
 2116         return 0;
 2117 bad:
 2118         ieee80211_free_node(ni);
 2119         return ret;
 2120 #undef senderr
 2121 }
 2122 
 2123 static int
 2124 ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
 2125 {
 2126         struct ieee80211_bpf_params params;
 2127 
 2128         memset(&params, 0, sizeof(params));
 2129         params.ibp_pri = WME_AC_VO;
 2130         params.ibp_rate0 = ni->ni_txparms->mgmtrate;
 2131         /* NB: we know all frames are unicast */
 2132         params.ibp_try0 = ni->ni_txparms->maxretry;
 2133         params.ibp_power = ni->ni_txpower;
 2134         return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
 2135              &params);
 2136 }
 2137 
 2138 #define ADDSHORT(frm, v) do {                   \
 2139         frm[0] = (v) & 0xff;                    \
 2140         frm[1] = (v) >> 8;                      \
 2141         frm += 2;                               \
 2142 } while (0)
 2143 
 2144 /*
 2145  * Send an action management frame.  The arguments are stuff
 2146  * into a frame without inspection; the caller is assumed to
 2147  * prepare them carefully (e.g. based on the aggregation state).
 2148  */
 2149 static int
 2150 ht_send_action_ba_addba(struct ieee80211_node *ni,
 2151         int category, int action, void *arg0)
 2152 {
 2153         struct ieee80211vap *vap = ni->ni_vap;
 2154         struct ieee80211com *ic = ni->ni_ic;
 2155         uint16_t *args = arg0;
 2156         struct mbuf *m;
 2157         uint8_t *frm;
 2158 
 2159         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2160             "send ADDBA %s: dialogtoken %d "
 2161             "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
 2162             (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
 2163                 "request" : "response",
 2164             args[0], args[1], MS(args[1], IEEE80211_BAPS_TID),
 2165             args[2], args[3]);
 2166 
 2167         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2168             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2169             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2170         ieee80211_ref_node(ni);
 2171 
 2172         m = ieee80211_getmgtframe(&frm,
 2173             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2174             sizeof(uint16_t)    /* action+category */
 2175             /* XXX may action payload */
 2176             + sizeof(struct ieee80211_action_ba_addbaresponse)
 2177         );
 2178         if (m != NULL) {
 2179                 *frm++ = category;
 2180                 *frm++ = action;
 2181                 *frm++ = args[0];               /* dialog token */
 2182                 ADDSHORT(frm, args[1]);         /* baparamset */
 2183                 ADDSHORT(frm, args[2]);         /* batimeout */
 2184                 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
 2185                         ADDSHORT(frm, args[3]); /* baseqctl */
 2186                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2187                 return ht_action_output(ni, m);
 2188         } else {
 2189                 vap->iv_stats.is_tx_nobuf++;
 2190                 ieee80211_free_node(ni);
 2191                 return ENOMEM;
 2192         }
 2193 }
 2194 
 2195 static int
 2196 ht_send_action_ba_delba(struct ieee80211_node *ni,
 2197         int category, int action, void *arg0)
 2198 {
 2199         struct ieee80211vap *vap = ni->ni_vap;
 2200         struct ieee80211com *ic = ni->ni_ic;
 2201         uint16_t *args = arg0;
 2202         struct mbuf *m;
 2203         uint16_t baparamset;
 2204         uint8_t *frm;
 2205 
 2206         baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
 2207                    | args[1]
 2208                    ;
 2209         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2210             "send DELBA action: tid %d, initiator %d reason %d",
 2211             args[0], args[1], args[2]);
 2212 
 2213         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2214             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2215             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2216         ieee80211_ref_node(ni);
 2217 
 2218         m = ieee80211_getmgtframe(&frm,
 2219             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2220             sizeof(uint16_t)    /* action+category */
 2221             /* XXX may action payload */
 2222             + sizeof(struct ieee80211_action_ba_addbaresponse)
 2223         );
 2224         if (m != NULL) {
 2225                 *frm++ = category;
 2226                 *frm++ = action;
 2227                 ADDSHORT(frm, baparamset);
 2228                 ADDSHORT(frm, args[2]);         /* reason code */
 2229                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2230                 return ht_action_output(ni, m);
 2231         } else {
 2232                 vap->iv_stats.is_tx_nobuf++;
 2233                 ieee80211_free_node(ni);
 2234                 return ENOMEM;
 2235         }
 2236 }
 2237 
 2238 static int
 2239 ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
 2240         int category, int action, void *arg0)
 2241 {
 2242         struct ieee80211vap *vap = ni->ni_vap;
 2243         struct ieee80211com *ic = ni->ni_ic;
 2244         struct mbuf *m;
 2245         uint8_t *frm;
 2246 
 2247         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2248             "send HT txchwidth: width %d",
 2249             IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
 2250 
 2251         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2252             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2253             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2254         ieee80211_ref_node(ni);
 2255 
 2256         m = ieee80211_getmgtframe(&frm,
 2257             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2258             sizeof(uint16_t)    /* action+category */
 2259             /* XXX may action payload */
 2260             + sizeof(struct ieee80211_action_ba_addbaresponse)
 2261         );
 2262         if (m != NULL) {
 2263                 *frm++ = category;
 2264                 *frm++ = action;
 2265                 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 
 2266                         IEEE80211_A_HT_TXCHWIDTH_2040 :
 2267                         IEEE80211_A_HT_TXCHWIDTH_20;
 2268                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2269                 return ht_action_output(ni, m);
 2270         } else {
 2271                 vap->iv_stats.is_tx_nobuf++;
 2272                 ieee80211_free_node(ni);
 2273                 return ENOMEM;
 2274         }
 2275 }
 2276 #undef ADDSHORT
 2277 
 2278 /*
 2279  * Construct the MCS bit mask for inclusion
 2280  * in an HT information element.
 2281  */
 2282 static void 
 2283 ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
 2284 {
 2285         int i;
 2286 
 2287         for (i = 0; i < rs->rs_nrates; i++) {
 2288                 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
 2289                 if (r < IEEE80211_HTRATE_MAXSIZE) {     /* XXX? */
 2290                         /* NB: this assumes a particular implementation */
 2291                         setbit(frm, r);
 2292                 }
 2293         }
 2294 }
 2295 
 2296 /*
 2297  * Add body of an HTCAP information element.
 2298  */
 2299 static uint8_t *
 2300 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
 2301 {
 2302 #define ADDSHORT(frm, v) do {                   \
 2303         frm[0] = (v) & 0xff;                    \
 2304         frm[1] = (v) >> 8;                      \
 2305         frm += 2;                               \
 2306 } while (0)
 2307         struct ieee80211vap *vap = ni->ni_vap;
 2308         uint16_t caps;
 2309         int rxmax, density;
 2310 
 2311         /* HT capabilities */
 2312         caps = vap->iv_htcaps & 0xffff;
 2313         /*
 2314          * Note channel width depends on whether we are operating as
 2315          * a sta or not.  When operating as a sta we are generating
 2316          * a request based on our desired configuration.  Otherwise
 2317          * we are operational and the channel attributes identify
 2318          * how we've been setup (which might be different if a fixed
 2319          * channel is specified).
 2320          */
 2321         if (vap->iv_opmode == IEEE80211_M_STA) {
 2322                 /* override 20/40 use based on config */
 2323                 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
 2324                         caps |= IEEE80211_HTCAP_CHWIDTH40;
 2325                 else
 2326                         caps &= ~IEEE80211_HTCAP_CHWIDTH40;
 2327                 /* use advertised setting (XXX locally constraint) */
 2328                 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
 2329                 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
 2330         } else {
 2331                 /* override 20/40 use based on current channel */
 2332                 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
 2333                         caps |= IEEE80211_HTCAP_CHWIDTH40;
 2334                 else
 2335                         caps &= ~IEEE80211_HTCAP_CHWIDTH40;
 2336                 rxmax = vap->iv_ampdu_rxmax;
 2337                 density = vap->iv_ampdu_density;
 2338         }
 2339         /* adjust short GI based on channel and config */
 2340         if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
 2341                 caps &= ~IEEE80211_HTCAP_SHORTGI20;
 2342         if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
 2343             (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
 2344                 caps &= ~IEEE80211_HTCAP_SHORTGI40;
 2345         ADDSHORT(frm, caps);
 2346 
 2347         /* HT parameters */
 2348         *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
 2349              | SM(density, IEEE80211_HTCAP_MPDUDENSITY)
 2350              ;
 2351         frm++;
 2352 
 2353         /* pre-zero remainder of ie */
 2354         memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 
 2355                 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
 2356 
 2357         /* supported MCS set */
 2358         /*
 2359          * XXX it would better to get the rate set from ni_htrates
 2360          * so we can restrict it but for sta mode ni_htrates isn't
 2361          * setup when we're called to form an AssocReq frame so for
 2362          * now we're restricted to the default HT rate set.
 2363          */
 2364         ieee80211_set_htrates(frm, &ieee80211_rateset_11n);
 2365 
 2366         frm += sizeof(struct ieee80211_ie_htcap) -
 2367                 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
 2368         return frm;
 2369 #undef ADDSHORT
 2370 }
 2371 
 2372 /*
 2373  * Add 802.11n HT capabilities information element
 2374  */
 2375 uint8_t *
 2376 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
 2377 {
 2378         frm[0] = IEEE80211_ELEMID_HTCAP;
 2379         frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
 2380         return ieee80211_add_htcap_body(frm + 2, ni);
 2381 }
 2382 
 2383 /*
 2384  * Add Broadcom OUI wrapped standard HTCAP ie; this is
 2385  * used for compatibility w/ pre-draft implementations.
 2386  */
 2387 uint8_t *
 2388 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
 2389 {
 2390         frm[0] = IEEE80211_ELEMID_VENDOR;
 2391         frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
 2392         frm[2] = (BCM_OUI >> 0) & 0xff;
 2393         frm[3] = (BCM_OUI >> 8) & 0xff;
 2394         frm[4] = (BCM_OUI >> 16) & 0xff;
 2395         frm[5] = BCM_OUI_HTCAP;
 2396         return ieee80211_add_htcap_body(frm + 6, ni);
 2397 }
 2398 
 2399 /*
 2400  * Construct the MCS bit mask of basic rates
 2401  * for inclusion in an HT information element.
 2402  */
 2403 static void
 2404 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
 2405 {
 2406         int i;
 2407 
 2408         for (i = 0; i < rs->rs_nrates; i++) {
 2409                 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
 2410                 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
 2411                     r < IEEE80211_HTRATE_MAXSIZE) {
 2412                         /* NB: this assumes a particular implementation */
 2413                         setbit(frm, r);
 2414                 }
 2415         }
 2416 }
 2417 
 2418 /*
 2419  * Update the HTINFO ie for a beacon frame.
 2420  */
 2421 void
 2422 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
 2423         struct ieee80211_beacon_offsets *bo)
 2424 {
 2425 #define PROTMODE        (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
 2426         const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan;
 2427         struct ieee80211com *ic = vap->iv_ic;
 2428         struct ieee80211_ie_htinfo *ht =
 2429            (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
 2430 
 2431         /* XXX only update on channel change */
 2432         ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
 2433         if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
 2434                 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
 2435         else
 2436                 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
 2437         if (IEEE80211_IS_CHAN_HT40U(bsschan))
 2438                 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
 2439         else if (IEEE80211_IS_CHAN_HT40D(bsschan))
 2440                 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
 2441         else
 2442                 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
 2443         if (IEEE80211_IS_CHAN_HT40(bsschan))
 2444                 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
 2445 
 2446         /* protection mode */
 2447         ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
 2448 
 2449         /* XXX propagate to vendor ie's */
 2450 #undef PROTMODE
 2451 }
 2452 
 2453 /*
 2454  * Add body of an HTINFO information element.
 2455  *
 2456  * NB: We don't use struct ieee80211_ie_htinfo because we can
 2457  * be called to fillin both a standard ie and a compat ie that
 2458  * has a vendor OUI at the front.
 2459  */
 2460 static uint8_t *
 2461 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
 2462 {
 2463         struct ieee80211vap *vap = ni->ni_vap;
 2464         struct ieee80211com *ic = ni->ni_ic;
 2465 
 2466         /* pre-zero remainder of ie */
 2467         memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
 2468 
 2469         /* primary/control channel center */
 2470         *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
 2471 
 2472         if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
 2473                 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
 2474         else
 2475                 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
 2476         if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
 2477                 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
 2478         else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
 2479                 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
 2480         else
 2481                 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
 2482         if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
 2483                 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
 2484 
 2485         frm[1] = ic->ic_curhtprotmode;
 2486 
 2487         frm += 5;
 2488 
 2489         /* basic MCS set */
 2490         ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
 2491         frm += sizeof(struct ieee80211_ie_htinfo) -
 2492                 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
 2493         return frm;
 2494 }
 2495 
 2496 /*
 2497  * Add 802.11n HT information information element.
 2498  */
 2499 uint8_t *
 2500 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
 2501 {
 2502         frm[0] = IEEE80211_ELEMID_HTINFO;
 2503         frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
 2504         return ieee80211_add_htinfo_body(frm + 2, ni);
 2505 }
 2506 
 2507 /*
 2508  * Add Broadcom OUI wrapped standard HTINFO ie; this is
 2509  * used for compatibility w/ pre-draft implementations.
 2510  */
 2511 uint8_t *
 2512 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
 2513 {
 2514         frm[0] = IEEE80211_ELEMID_VENDOR;
 2515         frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
 2516         frm[2] = (BCM_OUI >> 0) & 0xff;
 2517         frm[3] = (BCM_OUI >> 8) & 0xff;
 2518         frm[4] = (BCM_OUI >> 16) & 0xff;
 2519         frm[5] = BCM_OUI_HTINFO;
 2520         return ieee80211_add_htinfo_body(frm + 6, ni);
 2521 }

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