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/10.3/sys/net80211/ieee80211_ht.c 273736 2014-10-27 14:38:00Z hselasky $");
   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[IEEE80211_HTRATE_MAXSIZE] = {
   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         {  39,  43,   81,   90 },       /* MCS 16 */
   75         {  78,  87,  162,  180 },       /* MCS 17 */
   76         { 117, 130,  243,  270 },       /* MCS 18 */
   77         { 156, 173,  324,  360 },       /* MCS 19 */
   78         { 234, 260,  486,  540 },       /* MCS 20 */
   79         { 312, 347,  648,  720 },       /* MCS 21 */
   80         { 351, 390,  729,  810 },       /* MCS 22 */
   81         { 390, 433,  810,  900 },       /* MCS 23 */
   82         {  52,  58,  108,  120 },       /* MCS 24 */
   83         { 104, 116,  216,  240 },       /* MCS 25 */
   84         { 156, 173,  324,  360 },       /* MCS 26 */
   85         { 208, 231,  432,  480 },       /* MCS 27 */
   86         { 312, 347,  648,  720 },       /* MCS 28 */
   87         { 416, 462,  864,  960 },       /* MCS 29 */
   88         { 468, 520,  972, 1080 },       /* MCS 30 */
   89         { 520, 578, 1080, 1200 },       /* MCS 31 */
   90         {   0,   0,   12,   13 },       /* MCS 32 */
   91         {  78,  87,  162,  180 },       /* MCS 33 */
   92         { 104, 116,  216,  240 },       /* MCS 34 */
   93         { 130, 144,  270,  300 },       /* MCS 35 */
   94         { 117, 130,  243,  270 },       /* MCS 36 */
   95         { 156, 173,  324,  360 },       /* MCS 37 */
   96         { 195, 217,  405,  450 },       /* MCS 38 */
   97         { 104, 116,  216,  240 },       /* MCS 39 */
   98         { 130, 144,  270,  300 },       /* MCS 40 */
   99         { 130, 144,  270,  300 },       /* MCS 41 */
  100         { 156, 173,  324,  360 },       /* MCS 42 */
  101         { 182, 202,  378,  420 },       /* MCS 43 */
  102         { 182, 202,  378,  420 },       /* MCS 44 */
  103         { 208, 231,  432,  480 },       /* MCS 45 */
  104         { 156, 173,  324,  360 },       /* MCS 46 */
  105         { 195, 217,  405,  450 },       /* MCS 47 */
  106         { 195, 217,  405,  450 },       /* MCS 48 */
  107         { 234, 260,  486,  540 },       /* MCS 49 */
  108         { 273, 303,  567,  630 },       /* MCS 50 */
  109         { 273, 303,  567,  630 },       /* MCS 51 */
  110         { 312, 347,  648,  720 },       /* MCS 52 */
  111         { 130, 144,  270,  300 },       /* MCS 53 */
  112         { 156, 173,  324,  360 },       /* MCS 54 */
  113         { 182, 202,  378,  420 },       /* MCS 55 */
  114         { 156, 173,  324,  360 },       /* MCS 56 */
  115         { 182, 202,  378,  420 },       /* MCS 57 */
  116         { 208, 231,  432,  480 },       /* MCS 58 */
  117         { 234, 260,  486,  540 },       /* MCS 59 */
  118         { 208, 231,  432,  480 },       /* MCS 60 */
  119         { 234, 260,  486,  540 },       /* MCS 61 */
  120         { 260, 289,  540,  600 },       /* MCS 62 */
  121         { 260, 289,  540,  600 },       /* MCS 63 */
  122         { 286, 318,  594,  660 },       /* MCS 64 */
  123         { 195, 217,  405,  450 },       /* MCS 65 */
  124         { 234, 260,  486,  540 },       /* MCS 66 */
  125         { 273, 303,  567,  630 },       /* MCS 67 */
  126         { 234, 260,  486,  540 },       /* MCS 68 */
  127         { 273, 303,  567,  630 },       /* MCS 69 */
  128         { 312, 347,  648,  720 },       /* MCS 70 */
  129         { 351, 390,  729,  810 },       /* MCS 71 */
  130         { 312, 347,  648,  720 },       /* MCS 72 */
  131         { 351, 390,  729,  810 },       /* MCS 73 */
  132         { 390, 433,  810,  900 },       /* MCS 74 */
  133         { 390, 433,  810,  900 },       /* MCS 75 */
  134         { 429, 477,  891,  990 },       /* MCS 76 */
  135 };
  136 
  137 #ifdef IEEE80211_AMPDU_AGE
  138 static  int ieee80211_ampdu_age = -1;   /* threshold for ampdu reorder q (ms) */
  139 SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW,
  140         &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I",
  141         "AMPDU max reorder age (ms)");
  142 #endif
  143 
  144 static  int ieee80211_recv_bar_ena = 1;
  145 SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena,
  146             0, "BAR frame processing (ena/dis)");
  147 
  148 static  int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */
  149 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW,
  150         &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
  151         "ADDBA request timeout (ms)");
  152 static  int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
  153 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW,
  154         &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
  155         "ADDBA request backoff (ms)");
  156 static  int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
  157 SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLFLAG_RW,
  158         &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
  159 
  160 static  int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
  161 static  int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
  162 
  163 static  ieee80211_recv_action_func ht_recv_action_ba_addba_request;
  164 static  ieee80211_recv_action_func ht_recv_action_ba_addba_response;
  165 static  ieee80211_recv_action_func ht_recv_action_ba_delba;
  166 static  ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave;
  167 static  ieee80211_recv_action_func ht_recv_action_ht_txchwidth;
  168 
  169 static  ieee80211_send_action_func ht_send_action_ba_addba;
  170 static  ieee80211_send_action_func ht_send_action_ba_delba;
  171 static  ieee80211_send_action_func ht_send_action_ht_txchwidth;
  172 
  173 static void
  174 ieee80211_ht_init(void)
  175 {
  176         /*
  177          * Setup HT parameters that depends on the clock frequency.
  178          */
  179 #ifdef IEEE80211_AMPDU_AGE
  180         ieee80211_ampdu_age = msecs_to_ticks(500);
  181 #endif
  182         ieee80211_addba_timeout = msecs_to_ticks(250);
  183         ieee80211_addba_backoff = msecs_to_ticks(10*1000);
  184         ieee80211_bar_timeout = msecs_to_ticks(250);
  185         /*
  186          * Register action frame handlers.
  187          */
  188         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 
  189             IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request);
  190         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 
  191             IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response);
  192         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 
  193             IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba);
  194         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT, 
  195             IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave);
  196         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT, 
  197             IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth);
  198 
  199         ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 
  200             IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba);
  201         ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 
  202             IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba);
  203         ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 
  204             IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba);
  205         ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT, 
  206             IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth);
  207 }
  208 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL);
  209 
  210 static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
  211         struct ieee80211_tx_ampdu *tap);
  212 static int ieee80211_addba_request(struct ieee80211_node *ni,
  213         struct ieee80211_tx_ampdu *tap,
  214         int dialogtoken, int baparamset, int batimeout);
  215 static int ieee80211_addba_response(struct ieee80211_node *ni,
  216         struct ieee80211_tx_ampdu *tap,
  217         int code, int baparamset, int batimeout);
  218 static void ieee80211_addba_stop(struct ieee80211_node *ni,
  219         struct ieee80211_tx_ampdu *tap);
  220 static void null_addba_response_timeout(struct ieee80211_node *ni,
  221         struct ieee80211_tx_ampdu *tap);
  222 
  223 static void ieee80211_bar_response(struct ieee80211_node *ni,
  224         struct ieee80211_tx_ampdu *tap, int status);
  225 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
  226 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
  227 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
  228         int baparamset, int batimeout, int baseqctl);
  229 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
  230 
  231 void
  232 ieee80211_ht_attach(struct ieee80211com *ic)
  233 {
  234         /* setup default aggregation policy */
  235         ic->ic_recv_action = ieee80211_recv_action;
  236         ic->ic_send_action = ieee80211_send_action;
  237         ic->ic_ampdu_enable = ieee80211_ampdu_enable;
  238         ic->ic_addba_request = ieee80211_addba_request;
  239         ic->ic_addba_response = ieee80211_addba_response;
  240         ic->ic_addba_response_timeout = null_addba_response_timeout;
  241         ic->ic_addba_stop = ieee80211_addba_stop;
  242         ic->ic_bar_response = ieee80211_bar_response;
  243         ic->ic_ampdu_rx_start = ampdu_rx_start;
  244         ic->ic_ampdu_rx_stop = ampdu_rx_stop;
  245 
  246         ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
  247         ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
  248 }
  249 
  250 void
  251 ieee80211_ht_detach(struct ieee80211com *ic)
  252 {
  253 }
  254 
  255 void
  256 ieee80211_ht_vattach(struct ieee80211vap *vap)
  257 {
  258 
  259         /* driver can override defaults */
  260         vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
  261         vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
  262         vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
  263         vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
  264         /* tx aggregation traffic thresholds */
  265         vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
  266         vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
  267         vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
  268         vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
  269 
  270         if (vap->iv_htcaps & IEEE80211_HTC_HT) {
  271                 /*
  272                  * Device is HT capable; enable all HT-related
  273                  * facilities by default.
  274                  * XXX these choices may be too aggressive.
  275                  */
  276                 vap->iv_flags_ht |= IEEE80211_FHT_HT
  277                                  |  IEEE80211_FHT_HTCOMPAT
  278                                  ;
  279                 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
  280                         vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
  281                 /* XXX infer from channel list? */
  282                 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
  283                         vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
  284                         if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
  285                                 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
  286                 }
  287                 /* enable RIFS if capable */
  288                 if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
  289                         vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
  290 
  291                 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
  292                 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
  293                 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
  294                         vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
  295                 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
  296                 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
  297                         vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
  298         }
  299         /* NB: disable default legacy WDS, too many issues right now */
  300         if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
  301                 vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
  302 }
  303 
  304 void
  305 ieee80211_ht_vdetach(struct ieee80211vap *vap)
  306 {
  307 }
  308 
  309 static int
  310 ht_getrate(struct ieee80211com *ic, int index, enum ieee80211_phymode mode,
  311     int ratetype)
  312 {
  313         int mword, rate;
  314 
  315         mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode);
  316         if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
  317                 return (0);
  318         switch (ratetype) {
  319         case 0:
  320                 rate = ieee80211_htrates[index].ht20_rate_800ns;
  321                 break;
  322         case 1:
  323                 rate = ieee80211_htrates[index].ht20_rate_400ns;
  324                 break;
  325         case 2:
  326                 rate = ieee80211_htrates[index].ht40_rate_800ns;
  327                 break;
  328         default:
  329                 rate = ieee80211_htrates[index].ht40_rate_400ns;
  330                 break;
  331         }
  332         return (rate);
  333 }
  334 
  335 static struct printranges {
  336         int     minmcs;
  337         int     maxmcs;
  338         int     txstream;
  339         int     ratetype;
  340         int     htcapflags;
  341 } ranges[] = {
  342         {  0,  7, 1, 0, 0 },
  343         {  8, 15, 2, 0, 0 },
  344         { 16, 23, 3, 0, 0 },
  345         { 24, 31, 4, 0, 0 },
  346         { 32,  0, 1, 2, IEEE80211_HTC_TXMCS32 },
  347         { 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL },
  348         { 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL },
  349         { 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL },
  350         {  0,  0, 0, 0, 0 },
  351 };
  352 
  353 static void
  354 ht_rateprint(struct ieee80211com *ic, enum ieee80211_phymode mode, int ratetype)
  355 {
  356         struct ifnet *ifp = ic->ic_ifp;
  357         int minrate, maxrate;
  358         struct printranges *range;
  359 
  360         for (range = ranges; range->txstream != 0; range++) {
  361                 if (ic->ic_txstream < range->txstream)
  362                         continue;
  363                 if (range->htcapflags &&
  364                     (ic->ic_htcaps & range->htcapflags) == 0)
  365                         continue;
  366                 if (ratetype < range->ratetype)
  367                         continue;
  368                 minrate = ht_getrate(ic, range->minmcs, mode, ratetype);
  369                 maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype);
  370                 if (range->maxmcs) {
  371                         if_printf(ifp, "MCS %d-%d: %d%sMbps - %d%sMbps\n",
  372                             range->minmcs, range->maxmcs,
  373                             minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""),
  374                             maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : ""));
  375                 } else {
  376                         if_printf(ifp, "MCS %d: %d%sMbps\n", range->minmcs,
  377                             minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""));
  378                 }
  379         }
  380 }
  381 
  382 static void
  383 ht_announce(struct ieee80211com *ic, enum ieee80211_phymode mode)
  384 {
  385         struct ifnet *ifp = ic->ic_ifp;
  386         const char *modestr = ieee80211_phymode_name[mode];
  387 
  388         if_printf(ifp, "%s MCS 20MHz\n", modestr);
  389         ht_rateprint(ic, mode, 0);
  390         if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) {
  391                 if_printf(ifp, "%s MCS 20MHz SGI\n", modestr);
  392                 ht_rateprint(ic, mode, 1);
  393         }
  394         if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
  395                 if_printf(ifp, "%s MCS 40MHz:\n", modestr);
  396                 ht_rateprint(ic, mode, 2);
  397         }
  398         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
  399             (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) {
  400                 if_printf(ifp, "%s MCS 40MHz SGI:\n", modestr);
  401                 ht_rateprint(ic, mode, 3);
  402         }
  403 }
  404 
  405 void
  406 ieee80211_ht_announce(struct ieee80211com *ic)
  407 {
  408         struct ifnet *ifp = ic->ic_ifp;
  409 
  410         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
  411             isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
  412                 if_printf(ifp, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream);
  413         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
  414                 ht_announce(ic, IEEE80211_MODE_11NA);
  415         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
  416                 ht_announce(ic, IEEE80211_MODE_11NG);
  417 }
  418 
  419 static struct ieee80211_htrateset htrateset;
  420 
  421 const struct ieee80211_htrateset *
  422 ieee80211_get_suphtrates(struct ieee80211com *ic,
  423     const struct ieee80211_channel *c)
  424 {
  425 #define ADDRATE(x)      do {                                            \
  426         htrateset.rs_rates[htrateset.rs_nrates] = x;                    \
  427         htrateset.rs_nrates++;                                          \
  428 } while (0)
  429         int i;
  430 
  431         memset(&htrateset, 0, sizeof(struct ieee80211_htrateset));
  432         for (i = 0; i < ic->ic_txstream * 8; i++)
  433                 ADDRATE(i);
  434         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
  435             (ic->ic_htcaps & IEEE80211_HTC_TXMCS32))
  436                 ADDRATE(32);
  437         if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
  438                 if (ic->ic_txstream >= 2) {
  439                          for (i = 33; i <= 38; i++)
  440                                 ADDRATE(i);
  441                 }
  442                 if (ic->ic_txstream >= 3) {
  443                         for (i = 39; i <= 52; i++)
  444                                 ADDRATE(i);
  445                 }
  446                 if (ic->ic_txstream == 4) {
  447                         for (i = 53; i <= 76; i++)
  448                                 ADDRATE(i);
  449                 }
  450         }
  451         return &htrateset;
  452 #undef  ADDRATE
  453 }
  454 
  455 /*
  456  * Receive processing.
  457  */
  458 
  459 /*
  460  * Decap the encapsulated A-MSDU frames and dispatch all but
  461  * the last for delivery.  The last frame is returned for 
  462  * delivery via the normal path.
  463  */
  464 struct mbuf *
  465 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
  466 {
  467         struct ieee80211vap *vap = ni->ni_vap;
  468         int framelen;
  469         struct mbuf *n;
  470 
  471         /* discard 802.3 header inserted by ieee80211_decap */
  472         m_adj(m, sizeof(struct ether_header));
  473 
  474         vap->iv_stats.is_amsdu_decap++;
  475 
  476         for (;;) {
  477                 /*
  478                  * Decap the first frame, bust it apart from the
  479                  * remainder and deliver.  We leave the last frame
  480                  * delivery to the caller (for consistency with other
  481                  * code paths, could also do it here).
  482                  */
  483                 m = ieee80211_decap1(m, &framelen);
  484                 if (m == NULL) {
  485                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  486                             ni->ni_macaddr, "a-msdu", "%s", "decap failed");
  487                         vap->iv_stats.is_amsdu_tooshort++;
  488                         return NULL;
  489                 }
  490                 if (m->m_pkthdr.len == framelen)
  491                         break;
  492                 n = m_split(m, framelen, M_NOWAIT);
  493                 if (n == NULL) {
  494                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  495                             ni->ni_macaddr, "a-msdu",
  496                             "%s", "unable to split encapsulated frames");
  497                         vap->iv_stats.is_amsdu_split++;
  498                         m_freem(m);                     /* NB: must reclaim */
  499                         return NULL;
  500                 }
  501                 vap->iv_deliver_data(vap, ni, m);
  502 
  503                 /*
  504                  * Remove frame contents; each intermediate frame
  505                  * is required to be aligned to a 4-byte boundary.
  506                  */
  507                 m = n;
  508                 m_adj(m, roundup2(framelen, 4) - framelen);     /* padding */
  509         }
  510         return m;                               /* last delivered by caller */
  511 }
  512 
  513 /*
  514  * Purge all frames in the A-MPDU re-order queue.
  515  */
  516 static void
  517 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
  518 {
  519         struct mbuf *m;
  520         int i;
  521 
  522         for (i = 0; i < rap->rxa_wnd; i++) {
  523                 m = rap->rxa_m[i];
  524                 if (m != NULL) {
  525                         rap->rxa_m[i] = NULL;
  526                         rap->rxa_qbytes -= m->m_pkthdr.len;
  527                         m_freem(m);
  528                         if (--rap->rxa_qframes == 0)
  529                                 break;
  530                 }
  531         }
  532         KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
  533             ("lost %u data, %u frames on ampdu rx q",
  534             rap->rxa_qbytes, rap->rxa_qframes));
  535 }
  536 
  537 /*
  538  * Start A-MPDU rx/re-order processing for the specified TID.
  539  */
  540 static int
  541 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
  542         int baparamset, int batimeout, int baseqctl)
  543 {
  544         int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
  545 
  546         if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
  547                 /*
  548                  * AMPDU previously setup and not terminated with a DELBA,
  549                  * flush the reorder q's in case anything remains.
  550                  */
  551                 ampdu_rx_purge(rap);
  552         }
  553         memset(rap, 0, sizeof(*rap));
  554         rap->rxa_wnd = (bufsiz == 0) ?
  555             IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
  556         rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START);
  557         rap->rxa_flags |=  IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
  558 
  559         return 0;
  560 }
  561 
  562 /*
  563  * Stop A-MPDU rx processing for the specified TID.
  564  */
  565 static void
  566 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
  567 {
  568 
  569         ampdu_rx_purge(rap);
  570         rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
  571 }
  572 
  573 /*
  574  * Dispatch a frame from the A-MPDU reorder queue.  The
  575  * frame is fed back into ieee80211_input marked with an
  576  * M_AMPDU_MPDU flag so it doesn't come back to us (it also
  577  * permits ieee80211_input to optimize re-processing).
  578  */
  579 static __inline void
  580 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
  581 {
  582         m->m_flags |= M_AMPDU_MPDU;     /* bypass normal processing */
  583         /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
  584         (void) ieee80211_input(ni, m, 0, 0);
  585 }
  586 
  587 /*
  588  * Dispatch as many frames as possible from the re-order queue.
  589  * Frames will always be "at the front"; we process all frames
  590  * up to the first empty slot in the window.  On completion we
  591  * cleanup state if there are still pending frames in the current
  592  * BA window.  We assume the frame at slot 0 is already handled
  593  * by the caller; we always start at slot 1.
  594  */
  595 static void
  596 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
  597 {
  598         struct ieee80211vap *vap = ni->ni_vap;
  599         struct mbuf *m;
  600         int i;
  601 
  602         /* flush run of frames */
  603         for (i = 1; i < rap->rxa_wnd; i++) {
  604                 m = rap->rxa_m[i];
  605                 if (m == NULL)
  606                         break;
  607                 rap->rxa_m[i] = NULL;
  608                 rap->rxa_qbytes -= m->m_pkthdr.len;
  609                 rap->rxa_qframes--;
  610 
  611                 ampdu_dispatch(ni, m);
  612         }
  613         /*
  614          * If frames remain, copy the mbuf pointers down so
  615          * they correspond to the offsets in the new window.
  616          */
  617         if (rap->rxa_qframes != 0) {
  618                 int n = rap->rxa_qframes, j;
  619                 for (j = i+1; j < rap->rxa_wnd; j++) {
  620                         if (rap->rxa_m[j] != NULL) {
  621                                 rap->rxa_m[j-i] = rap->rxa_m[j];
  622                                 rap->rxa_m[j] = NULL;
  623                                 if (--n == 0)
  624                                         break;
  625                         }
  626                 }
  627                 KASSERT(n == 0, ("lost %d frames", n));
  628                 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
  629         }
  630         /*
  631          * Adjust the start of the BA window to
  632          * reflect the frames just dispatched.
  633          */
  634         rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
  635         vap->iv_stats.is_ampdu_rx_oor += i;
  636 }
  637 
  638 #ifdef IEEE80211_AMPDU_AGE
  639 /*
  640  * Dispatch all frames in the A-MPDU re-order queue.
  641  */
  642 static void
  643 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
  644 {
  645         struct ieee80211vap *vap = ni->ni_vap;
  646         struct mbuf *m;
  647         int i;
  648 
  649         for (i = 0; i < rap->rxa_wnd; i++) {
  650                 m = rap->rxa_m[i];
  651                 if (m == NULL)
  652                         continue;
  653                 rap->rxa_m[i] = NULL;
  654                 rap->rxa_qbytes -= m->m_pkthdr.len;
  655                 rap->rxa_qframes--;
  656                 vap->iv_stats.is_ampdu_rx_oor++;
  657 
  658                 ampdu_dispatch(ni, m);
  659                 if (rap->rxa_qframes == 0)
  660                         break;
  661         }
  662 }
  663 #endif /* IEEE80211_AMPDU_AGE */
  664 
  665 /*
  666  * Dispatch all frames in the A-MPDU re-order queue
  667  * preceding the specified sequence number.  This logic
  668  * handles window moves due to a received MSDU or BAR.
  669  */
  670 static void
  671 ampdu_rx_flush_upto(struct ieee80211_node *ni,
  672         struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
  673 {
  674         struct ieee80211vap *vap = ni->ni_vap;
  675         struct mbuf *m;
  676         ieee80211_seq seqno;
  677         int i;
  678 
  679         /*
  680          * Flush any complete MSDU's with a sequence number lower
  681          * than winstart.  Gaps may exist.  Note that we may actually
  682          * dispatch frames past winstart if a run continues; this is
  683          * an optimization that avoids having to do a separate pass
  684          * to dispatch frames after moving the BA window start.
  685          */
  686         seqno = rap->rxa_start;
  687         for (i = 0; i < rap->rxa_wnd; i++) {
  688                 m = rap->rxa_m[i];
  689                 if (m != NULL) {
  690                         rap->rxa_m[i] = NULL;
  691                         rap->rxa_qbytes -= m->m_pkthdr.len;
  692                         rap->rxa_qframes--;
  693                         vap->iv_stats.is_ampdu_rx_oor++;
  694 
  695                         ampdu_dispatch(ni, m);
  696                 } else {
  697                         if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
  698                                 break;
  699                 }
  700                 seqno = IEEE80211_SEQ_INC(seqno);
  701         }
  702         /*
  703          * If frames remain, copy the mbuf pointers down so
  704          * they correspond to the offsets in the new window.
  705          */
  706         if (rap->rxa_qframes != 0) {
  707                 int n = rap->rxa_qframes, j;
  708 
  709                 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
  710                 KASSERT(rap->rxa_m[0] == NULL,
  711                     ("%s: BA window slot 0 occupied", __func__));
  712                 for (j = i+1; j < rap->rxa_wnd; j++) {
  713                         if (rap->rxa_m[j] != NULL) {
  714                                 rap->rxa_m[j-i] = rap->rxa_m[j];
  715                                 rap->rxa_m[j] = NULL;
  716                                 if (--n == 0)
  717                                         break;
  718                         }
  719                 }
  720                 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
  721                     "BA win <%d:%d> winstart %d",
  722                     __func__, n, rap->rxa_qframes, i, rap->rxa_start,
  723                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  724                     winstart));
  725                 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
  726         }
  727         /*
  728          * Move the start of the BA window; we use the
  729          * sequence number of the last MSDU that was
  730          * passed up the stack+1 or winstart if stopped on
  731          * a gap in the reorder buffer.
  732          */
  733         rap->rxa_start = seqno;
  734 }
  735 
  736 /*
  737  * Process a received QoS data frame for an HT station.  Handle
  738  * A-MPDU reordering: if this frame is received out of order
  739  * and falls within the BA window hold onto it.  Otherwise if
  740  * this frame completes a run, flush any pending frames.  We
  741  * return 1 if the frame is consumed.  A 0 is returned if
  742  * the frame should be processed normally by the caller.
  743  */
  744 int
  745 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
  746 {
  747 #define IEEE80211_FC0_QOSDATA \
  748         (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
  749 #define PROCESS         0       /* caller should process frame */
  750 #define CONSUMED        1       /* frame consumed, caller does nothing */
  751         struct ieee80211vap *vap = ni->ni_vap;
  752         struct ieee80211_qosframe *wh;
  753         struct ieee80211_rx_ampdu *rap;
  754         ieee80211_seq rxseq;
  755         uint8_t tid;
  756         int off;
  757 
  758         KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
  759             ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
  760         KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
  761 
  762         /* NB: m_len known to be sufficient */
  763         wh = mtod(m, struct ieee80211_qosframe *);
  764         if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
  765                 /*
  766                  * Not QoS data, shouldn't get here but just
  767                  * return it to the caller for processing.
  768                  */
  769                 return PROCESS;
  770         }
  771         if (IEEE80211_IS_DSTODS(wh))
  772                 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
  773         else
  774                 tid = wh->i_qos[0];
  775         tid &= IEEE80211_QOS_TID;
  776         rap = &ni->ni_rx_ampdu[tid];
  777         if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
  778                 /*
  779                  * No ADDBA request yet, don't touch.
  780                  */
  781                 return PROCESS;
  782         }
  783         rxseq = le16toh(*(uint16_t *)wh->i_seq);
  784         if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
  785                 /*
  786                  * Fragments are not allowed; toss.
  787                  */
  788                 IEEE80211_DISCARD_MAC(vap,
  789                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
  790                     "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
  791                     wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
  792                 vap->iv_stats.is_ampdu_rx_drop++;
  793                 IEEE80211_NODE_STAT(ni, rx_drop);
  794                 m_freem(m);
  795                 return CONSUMED;
  796         }
  797         rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
  798         rap->rxa_nframes++;
  799 again:
  800         if (rxseq == rap->rxa_start) {
  801                 /*
  802                  * First frame in window.
  803                  */
  804                 if (rap->rxa_qframes != 0) {
  805                         /*
  806                          * Dispatch as many packets as we can.
  807                          */
  808                         KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
  809                         ampdu_dispatch(ni, m);
  810                         ampdu_rx_dispatch(rap, ni);
  811                         return CONSUMED;
  812                 } else {
  813                         /*
  814                          * In order; advance window and notify
  815                          * caller to dispatch directly.
  816                          */
  817                         rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
  818                         return PROCESS;
  819                 }
  820         }
  821         /*
  822          * Frame is out of order; store if in the BA window.
  823          */
  824         /* calculate offset in BA window */
  825         off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
  826         if (off < rap->rxa_wnd) {
  827                 /*
  828                  * Common case (hopefully): in the BA window.
  829                  * Sec 9.10.7.6.2 a) (p.137)
  830                  */
  831 #ifdef IEEE80211_AMPDU_AGE
  832                 /* 
  833                  * Check for frames sitting too long in the reorder queue.
  834                  * This should only ever happen if frames are not delivered
  835                  * without the sender otherwise notifying us (e.g. with a
  836                  * BAR to move the window).  Typically this happens because
  837                  * of vendor bugs that cause the sequence number to jump.
  838                  * When this happens we get a gap in the reorder queue that
  839                  * leaves frame sitting on the queue until they get pushed
  840                  * out due to window moves.  When the vendor does not send
  841                  * BAR this move only happens due to explicit packet sends
  842                  *
  843                  * NB: we only track the time of the oldest frame in the
  844                  * reorder q; this means that if we flush we might push
  845                  * frames that still "new"; if this happens then subsequent
  846                  * frames will result in BA window moves which cost something
  847                  * but is still better than a big throughput dip.
  848                  */
  849                 if (rap->rxa_qframes != 0) {
  850                         /* XXX honor batimeout? */
  851                         if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
  852                                 /*
  853                                  * Too long since we received the first
  854                                  * frame; flush the reorder buffer.
  855                                  */
  856                                 if (rap->rxa_qframes != 0) {
  857                                         vap->iv_stats.is_ampdu_rx_age +=
  858                                             rap->rxa_qframes;
  859                                         ampdu_rx_flush(ni, rap);
  860                                 }
  861                                 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
  862                                 return PROCESS;
  863                         }
  864                 } else {
  865                         /*
  866                          * First frame, start aging timer.
  867                          */
  868                         rap->rxa_age = ticks;
  869                 }
  870 #endif /* IEEE80211_AMPDU_AGE */
  871                 /* save packet */
  872                 if (rap->rxa_m[off] == NULL) {
  873                         rap->rxa_m[off] = m;
  874                         rap->rxa_qframes++;
  875                         rap->rxa_qbytes += m->m_pkthdr.len;
  876                         vap->iv_stats.is_ampdu_rx_reorder++;
  877                 } else {
  878                         IEEE80211_DISCARD_MAC(vap,
  879                             IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
  880                             ni->ni_macaddr, "a-mpdu duplicate",
  881                             "seqno %u tid %u BA win <%u:%u>",
  882                             rxseq, tid, rap->rxa_start,
  883                             IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
  884                         vap->iv_stats.is_rx_dup++;
  885                         IEEE80211_NODE_STAT(ni, rx_dup);
  886                         m_freem(m);
  887                 }
  888                 return CONSUMED;
  889         }
  890         if (off < IEEE80211_SEQ_BA_RANGE) {
  891                 /*
  892                  * Outside the BA window, but within range;
  893                  * flush the reorder q and move the window.
  894                  * Sec 9.10.7.6.2 b) (p.138)
  895                  */
  896                 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
  897                     "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
  898                     rap->rxa_start,
  899                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  900                     rap->rxa_qframes, rxseq, tid);
  901                 vap->iv_stats.is_ampdu_rx_move++;
  902 
  903                 /*
  904                  * The spec says to flush frames up to but not including:
  905                  *      WinStart_B = rxseq - rap->rxa_wnd + 1
  906                  * Then insert the frame or notify the caller to process
  907                  * it immediately.  We can safely do this by just starting
  908                  * over again because we know the frame will now be within
  909                  * the BA window.
  910                  */
  911                 /* NB: rxa_wnd known to be >0 */
  912                 ampdu_rx_flush_upto(ni, rap,
  913                     IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
  914                 goto again;
  915         } else {
  916                 /*
  917                  * Outside the BA window and out of range; toss.
  918                  * Sec 9.10.7.6.2 c) (p.138)
  919                  */
  920                 IEEE80211_DISCARD_MAC(vap,
  921                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
  922                     "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
  923                     rap->rxa_start,
  924                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  925                     rap->rxa_qframes, rxseq, tid,
  926                     wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
  927                 vap->iv_stats.is_ampdu_rx_drop++;
  928                 IEEE80211_NODE_STAT(ni, rx_drop);
  929                 m_freem(m);
  930                 return CONSUMED;
  931         }
  932 #undef CONSUMED
  933 #undef PROCESS
  934 #undef IEEE80211_FC0_QOSDATA
  935 }
  936 
  937 /*
  938  * Process a BAR ctl frame.  Dispatch all frames up to
  939  * the sequence number of the frame.  If this frame is
  940  * out of range it's discarded.
  941  */
  942 void
  943 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
  944 {
  945         struct ieee80211vap *vap = ni->ni_vap;
  946         struct ieee80211_frame_bar *wh;
  947         struct ieee80211_rx_ampdu *rap;
  948         ieee80211_seq rxseq;
  949         int tid, off;
  950 
  951         if (!ieee80211_recv_bar_ena) {
  952 #if 0
  953                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
  954                     ni->ni_macaddr, "BAR", "%s", "processing disabled");
  955 #endif
  956                 vap->iv_stats.is_ampdu_bar_bad++;
  957                 return;
  958         }
  959         wh = mtod(m0, struct ieee80211_frame_bar *);
  960         /* XXX check basic BAR */
  961         tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
  962         rap = &ni->ni_rx_ampdu[tid];
  963         if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
  964                 /*
  965                  * No ADDBA request yet, don't touch.
  966                  */
  967                 IEEE80211_DISCARD_MAC(vap,
  968                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
  969                     ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
  970                 vap->iv_stats.is_ampdu_bar_bad++;
  971                 return;
  972         }
  973         vap->iv_stats.is_ampdu_bar_rx++;
  974         rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
  975         if (rxseq == rap->rxa_start)
  976                 return;
  977         /* calculate offset in BA window */
  978         off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
  979         if (off < IEEE80211_SEQ_BA_RANGE) {
  980                 /*
  981                  * Flush the reorder q up to rxseq and move the window.
  982                  * Sec 9.10.7.6.3 a) (p.138)
  983                  */
  984                 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
  985                     "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
  986                     rap->rxa_start,
  987                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  988                     rap->rxa_qframes, rxseq, tid);
  989                 vap->iv_stats.is_ampdu_bar_move++;
  990 
  991                 ampdu_rx_flush_upto(ni, rap, rxseq);
  992                 if (off >= rap->rxa_wnd) {
  993                         /*
  994                          * BAR specifies a window start to the right of BA
  995                          * window; we must move it explicitly since
  996                          * ampdu_rx_flush_upto will not.
  997                          */
  998                         rap->rxa_start = rxseq;
  999                 }
 1000         } else {
 1001                 /*
 1002                  * Out of range; toss.
 1003                  * Sec 9.10.7.6.3 b) (p.138)
 1004                  */
 1005                 IEEE80211_DISCARD_MAC(vap,
 1006                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
 1007                     "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
 1008                     rap->rxa_start,
 1009                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
 1010                     rap->rxa_qframes, rxseq, tid,
 1011                     wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
 1012                 vap->iv_stats.is_ampdu_bar_oow++;
 1013                 IEEE80211_NODE_STAT(ni, rx_drop);
 1014         }
 1015 }
 1016 
 1017 /*
 1018  * Setup HT-specific state in a node.  Called only
 1019  * when HT use is negotiated so we don't do extra
 1020  * work for temporary and/or legacy sta's.
 1021  */
 1022 void
 1023 ieee80211_ht_node_init(struct ieee80211_node *ni)
 1024 {
 1025         struct ieee80211_tx_ampdu *tap;
 1026         int tid;
 1027 
 1028         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 1029             ni,
 1030             "%s: called",
 1031             __func__);
 1032 
 1033         if (ni->ni_flags & IEEE80211_NODE_HT) {
 1034                 /*
 1035                  * Clean AMPDU state on re-associate.  This handles the case
 1036                  * where a station leaves w/o notifying us and then returns
 1037                  * before node is reaped for inactivity.
 1038                  */
 1039                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 1040                     ni,
 1041                     "%s: calling cleanup",
 1042                     __func__);
 1043                 ieee80211_ht_node_cleanup(ni);
 1044         }
 1045         for (tid = 0; tid < WME_NUM_TID; tid++) {
 1046                 tap = &ni->ni_tx_ampdu[tid];
 1047                 tap->txa_tid = tid;
 1048                 tap->txa_ni = ni;
 1049                 /* NB: further initialization deferred */
 1050         }
 1051         ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
 1052 }
 1053 
 1054 /*
 1055  * Cleanup HT-specific state in a node.  Called only
 1056  * when HT use has been marked.
 1057  */
 1058 void
 1059 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
 1060 {
 1061         struct ieee80211com *ic = ni->ni_ic;
 1062         int i;
 1063 
 1064         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 1065             ni,
 1066             "%s: called",
 1067             __func__);
 1068 
 1069         KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
 1070 
 1071         /* XXX optimize this */
 1072         for (i = 0; i < WME_NUM_TID; i++) {
 1073                 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
 1074                 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
 1075                         ampdu_tx_stop(tap);
 1076         }
 1077         for (i = 0; i < WME_NUM_TID; i++)
 1078                 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
 1079 
 1080         ni->ni_htcap = 0;
 1081         ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
 1082 }
 1083 
 1084 /*
 1085  * Age out HT resources for a station.
 1086  */
 1087 void
 1088 ieee80211_ht_node_age(struct ieee80211_node *ni)
 1089 {
 1090 #ifdef IEEE80211_AMPDU_AGE
 1091         struct ieee80211vap *vap = ni->ni_vap;
 1092         uint8_t tid;
 1093 #endif
 1094 
 1095         KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
 1096 
 1097 #ifdef IEEE80211_AMPDU_AGE
 1098         for (tid = 0; tid < WME_NUM_TID; tid++) {
 1099                 struct ieee80211_rx_ampdu *rap;
 1100 
 1101                 rap = &ni->ni_rx_ampdu[tid];
 1102                 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
 1103                         continue;
 1104                 if (rap->rxa_qframes == 0)
 1105                         continue;
 1106                 /* 
 1107                  * Check for frames sitting too long in the reorder queue.
 1108                  * See above for more details on what's happening here.
 1109                  */
 1110                 /* XXX honor batimeout? */
 1111                 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
 1112                         /*
 1113                          * Too long since we received the first
 1114                          * frame; flush the reorder buffer.
 1115                          */
 1116                         vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
 1117                         ampdu_rx_flush(ni, rap);
 1118                 }
 1119         }
 1120 #endif /* IEEE80211_AMPDU_AGE */
 1121 }
 1122 
 1123 static struct ieee80211_channel *
 1124 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
 1125 {
 1126         return ieee80211_find_channel(ic, c->ic_freq,
 1127             (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
 1128 }
 1129 
 1130 /*
 1131  * Adjust a channel to be HT/non-HT according to the vap's configuration.
 1132  */
 1133 struct ieee80211_channel *
 1134 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
 1135         struct ieee80211_channel *chan, int flags)
 1136 {
 1137         struct ieee80211_channel *c;
 1138 
 1139         if (flags & IEEE80211_FHT_HT) {
 1140                 /* promote to HT if possible */
 1141                 if (flags & IEEE80211_FHT_USEHT40) {
 1142                         if (!IEEE80211_IS_CHAN_HT40(chan)) {
 1143                                 /* NB: arbitrarily pick ht40+ over ht40- */
 1144                                 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
 1145                                 if (c == NULL)
 1146                                         c = findhtchan(ic, chan,
 1147                                                 IEEE80211_CHAN_HT40D);
 1148                                 if (c == NULL)
 1149                                         c = findhtchan(ic, chan,
 1150                                                 IEEE80211_CHAN_HT20);
 1151                                 if (c != NULL)
 1152                                         chan = c;
 1153                         }
 1154                 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
 1155                         c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
 1156                         if (c != NULL)
 1157                                 chan = c;
 1158                 }
 1159         } else if (IEEE80211_IS_CHAN_HT(chan)) {
 1160                 /* demote to legacy, HT use is disabled */
 1161                 c = ieee80211_find_channel(ic, chan->ic_freq,
 1162                     chan->ic_flags &~ IEEE80211_CHAN_HT);
 1163                 if (c != NULL)
 1164                         chan = c;
 1165         }
 1166         return chan;
 1167 }
 1168 
 1169 /*
 1170  * Setup HT-specific state for a legacy WDS peer.
 1171  */
 1172 void
 1173 ieee80211_ht_wds_init(struct ieee80211_node *ni)
 1174 {
 1175         struct ieee80211vap *vap = ni->ni_vap;
 1176         struct ieee80211_tx_ampdu *tap;
 1177         int tid;
 1178 
 1179         KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
 1180 
 1181         /* XXX check scan cache in case peer has an ap and we have info */
 1182         /*
 1183          * If setup with a legacy channel; locate an HT channel.
 1184          * Otherwise if the inherited channel (from a companion
 1185          * AP) is suitable use it so we use the same location
 1186          * for the extension channel).
 1187          */
 1188         ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
 1189             ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
 1190 
 1191         ni->ni_htcap = 0;
 1192         if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
 1193                 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
 1194         if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
 1195                 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
 1196                 ni->ni_chw = 40;
 1197                 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
 1198                         ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
 1199                 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
 1200                         ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
 1201                 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
 1202                         ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
 1203         } else {
 1204                 ni->ni_chw = 20;
 1205                 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
 1206         }
 1207         ni->ni_htctlchan = ni->ni_chan->ic_ieee;
 1208         if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
 1209                 ni->ni_flags |= IEEE80211_NODE_RIFS;
 1210         /* XXX does it make sense to enable SMPS? */
 1211 
 1212         ni->ni_htopmode = 0;            /* XXX need protection state */
 1213         ni->ni_htstbc = 0;              /* XXX need info */
 1214 
 1215         for (tid = 0; tid < WME_NUM_TID; tid++) {
 1216                 tap = &ni->ni_tx_ampdu[tid];
 1217                 tap->txa_tid = tid;
 1218         }
 1219         /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
 1220         ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
 1221 }
 1222 
 1223 /*
 1224  * Notify hostap vaps of a change in the HTINFO ie.
 1225  */
 1226 static void
 1227 htinfo_notify(struct ieee80211com *ic)
 1228 {
 1229         struct ieee80211vap *vap;
 1230         int first = 1;
 1231 
 1232         IEEE80211_LOCK_ASSERT(ic);
 1233 
 1234         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
 1235                 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
 1236                         continue;
 1237                 if (vap->iv_state != IEEE80211_S_RUN ||
 1238                     !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
 1239                         continue;
 1240                 if (first) {
 1241                         IEEE80211_NOTE(vap,
 1242                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
 1243                             vap->iv_bss,
 1244                             "HT bss occupancy change: %d sta, %d ht, "
 1245                             "%d ht40%s, HT protmode now 0x%x"
 1246                             , ic->ic_sta_assoc
 1247                             , ic->ic_ht_sta_assoc
 1248                             , ic->ic_ht40_sta_assoc
 1249                             , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ?
 1250                                  ", non-HT sta present" : ""
 1251                             , ic->ic_curhtprotmode);
 1252                         first = 0;
 1253                 }
 1254                 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
 1255         }
 1256 }
 1257 
 1258 /*
 1259  * Calculate HT protection mode from current
 1260  * state and handle updates.
 1261  */
 1262 static void
 1263 htinfo_update(struct ieee80211com *ic)
 1264 {
 1265         uint8_t protmode;
 1266 
 1267         if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
 1268                 protmode = IEEE80211_HTINFO_OPMODE_MIXED
 1269                          | IEEE80211_HTINFO_NONHT_PRESENT;
 1270         } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) {
 1271                 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
 1272                          | IEEE80211_HTINFO_NONHT_PRESENT;
 1273         } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
 1274             IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 
 1275             ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
 1276                 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
 1277         } else {
 1278                 protmode = IEEE80211_HTINFO_OPMODE_PURE;
 1279         }
 1280         if (protmode != ic->ic_curhtprotmode) {
 1281                 ic->ic_curhtprotmode = protmode;
 1282                 htinfo_notify(ic);
 1283         }
 1284 }
 1285 
 1286 /*
 1287  * Handle an HT station joining a BSS.
 1288  */
 1289 void
 1290 ieee80211_ht_node_join(struct ieee80211_node *ni)
 1291 {
 1292         struct ieee80211com *ic = ni->ni_ic;
 1293 
 1294         IEEE80211_LOCK_ASSERT(ic);
 1295 
 1296         if (ni->ni_flags & IEEE80211_NODE_HT) {
 1297                 ic->ic_ht_sta_assoc++;
 1298                 if (ni->ni_chw == 40)
 1299                         ic->ic_ht40_sta_assoc++;
 1300         }
 1301         htinfo_update(ic);
 1302 }
 1303 
 1304 /*
 1305  * Handle an HT station leaving a BSS.
 1306  */
 1307 void
 1308 ieee80211_ht_node_leave(struct ieee80211_node *ni)
 1309 {
 1310         struct ieee80211com *ic = ni->ni_ic;
 1311 
 1312         IEEE80211_LOCK_ASSERT(ic);
 1313 
 1314         if (ni->ni_flags & IEEE80211_NODE_HT) {
 1315                 ic->ic_ht_sta_assoc--;
 1316                 if (ni->ni_chw == 40)
 1317                         ic->ic_ht40_sta_assoc--;
 1318         }
 1319         htinfo_update(ic);
 1320 }
 1321 
 1322 /*
 1323  * Public version of htinfo_update; used for processing
 1324  * beacon frames from overlapping bss.
 1325  *
 1326  * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
 1327  * (on receipt of a beacon that advertises MIXED) or
 1328  * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
 1329  * from an overlapping legacy bss).  We treat MIXED with
 1330  * a higher precedence than PROTOPT (i.e. we will not change
 1331  * change PROTOPT -> MIXED; only MIXED -> PROTOPT).  This
 1332  * corresponds to how we handle things in htinfo_update.
 1333  */
 1334 void
 1335 ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
 1336 {
 1337 #define OPMODE(x)       SM(x, IEEE80211_HTINFO_OPMODE)
 1338         IEEE80211_LOCK(ic);
 1339 
 1340         /* track non-HT station presence */
 1341         KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
 1342             ("protmode 0x%x", protmode));
 1343         ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
 1344         ic->ic_lastnonht = ticks;
 1345 
 1346         if (protmode != ic->ic_curhtprotmode &&
 1347             (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
 1348              OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
 1349                 /* push beacon update */
 1350                 ic->ic_curhtprotmode = protmode;
 1351                 htinfo_notify(ic);
 1352         }
 1353         IEEE80211_UNLOCK(ic);
 1354 #undef OPMODE
 1355 }
 1356 
 1357 /*
 1358  * Time out presence of an overlapping bss with non-HT
 1359  * stations.  When operating in hostap mode we listen for
 1360  * beacons from other stations and if we identify a non-HT
 1361  * station is present we update the opmode field of the
 1362  * HTINFO ie.  To identify when all non-HT stations are
 1363  * gone we time out this condition.
 1364  */
 1365 void
 1366 ieee80211_ht_timeout(struct ieee80211com *ic)
 1367 {
 1368         IEEE80211_LOCK_ASSERT(ic);
 1369 
 1370         if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) &&
 1371             time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
 1372 #if 0
 1373                 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
 1374                     "%s", "time out non-HT STA present on channel");
 1375 #endif
 1376                 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
 1377                 htinfo_update(ic);
 1378         }
 1379 }
 1380 
 1381 /* unalligned little endian access */     
 1382 #define LE_READ_2(p)                                    \
 1383         ((uint16_t)                                     \
 1384          ((((const uint8_t *)(p))[0]      ) |           \
 1385           (((const uint8_t *)(p))[1] <<  8)))
 1386 
 1387 /*
 1388  * Process an 802.11n HT capabilities ie.
 1389  */
 1390 void
 1391 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
 1392 {
 1393         if (ie[0] == IEEE80211_ELEMID_VENDOR) {
 1394                 /*
 1395                  * Station used Vendor OUI ie to associate;
 1396                  * mark the node so when we respond we'll use
 1397                  * the Vendor OUI's and not the standard ie's.
 1398                  */
 1399                 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
 1400                 ie += 4;
 1401         } else
 1402                 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
 1403 
 1404         ni->ni_htcap = LE_READ_2(ie +
 1405                 __offsetof(struct ieee80211_ie_htcap, hc_cap));
 1406         ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
 1407 }
 1408 
 1409 static void
 1410 htinfo_parse(struct ieee80211_node *ni,
 1411         const struct ieee80211_ie_htinfo *htinfo)
 1412 {
 1413         uint16_t w;
 1414 
 1415         ni->ni_htctlchan = htinfo->hi_ctrlchannel;
 1416         ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
 1417         w = LE_READ_2(&htinfo->hi_byte2);
 1418         ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
 1419         w = LE_READ_2(&htinfo->hi_byte45);
 1420         ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
 1421 }
 1422 
 1423 /*
 1424  * Parse an 802.11n HT info ie and save useful information
 1425  * to the node state.  Note this does not effect any state
 1426  * changes such as for channel width change.
 1427  */
 1428 void
 1429 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
 1430 {
 1431         if (ie[0] == IEEE80211_ELEMID_VENDOR)
 1432                 ie += 4;
 1433         htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
 1434 }
 1435 
 1436 /*
 1437  * Handle 11n channel switch.  Use the received HT ie's to
 1438  * identify the right channel to use.  If we cannot locate it
 1439  * in the channel table then fallback to legacy operation.
 1440  * Note that we use this information to identify the node's
 1441  * channel only; the caller is responsible for insuring any
 1442  * required channel change is done (e.g. in sta mode when
 1443  * parsing the contents of a beacon frame).
 1444  */
 1445 static int
 1446 htinfo_update_chw(struct ieee80211_node *ni, int htflags)
 1447 {
 1448         struct ieee80211com *ic = ni->ni_ic;
 1449         struct ieee80211_channel *c;
 1450         int chanflags;
 1451         int ret = 0;
 1452 
 1453         chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
 1454         if (chanflags != ni->ni_chan->ic_flags) {
 1455                 /* XXX not right for ht40- */
 1456                 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
 1457                 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
 1458                         /*
 1459                          * No HT40 channel entry in our table; fall back
 1460                          * to HT20 operation.  This should not happen.
 1461                          */
 1462                         c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
 1463 #if 0
 1464                         IEEE80211_NOTE(ni->ni_vap,
 1465                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
 1466                             "no HT40 channel (freq %u), falling back to HT20",
 1467                             ni->ni_chan->ic_freq);
 1468 #endif
 1469                         /* XXX stat */
 1470                 }
 1471                 if (c != NULL && c != ni->ni_chan) {
 1472                         IEEE80211_NOTE(ni->ni_vap,
 1473                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
 1474                             "switch station to HT%d channel %u/0x%x",
 1475                             IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
 1476                             c->ic_freq, c->ic_flags);
 1477                         ni->ni_chan = c;
 1478                         ret = 1;
 1479                 }
 1480                 /* NB: caller responsible for forcing any channel change */
 1481         }
 1482         /* update node's tx channel width */
 1483         ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
 1484         return (ret);
 1485 }
 1486 
 1487 /*
 1488  * Update 11n MIMO PS state according to received htcap.
 1489  */
 1490 static __inline int
 1491 htcap_update_mimo_ps(struct ieee80211_node *ni)
 1492 {
 1493         uint16_t oflags = ni->ni_flags;
 1494 
 1495         switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
 1496         case IEEE80211_HTCAP_SMPS_DYNAMIC:
 1497                 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
 1498                 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
 1499                 break;
 1500         case IEEE80211_HTCAP_SMPS_ENA:
 1501                 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
 1502                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
 1503                 break;
 1504         case IEEE80211_HTCAP_SMPS_OFF:
 1505         default:                /* disable on rx of reserved value */
 1506                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
 1507                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
 1508                 break;
 1509         }
 1510         return (oflags ^ ni->ni_flags);
 1511 }
 1512 
 1513 /*
 1514  * Update short GI state according to received htcap
 1515  * and local settings.
 1516  */
 1517 static __inline void
 1518 htcap_update_shortgi(struct ieee80211_node *ni)
 1519 {
 1520         struct ieee80211vap *vap = ni->ni_vap;
 1521 
 1522         ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
 1523         if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
 1524             (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
 1525                 ni->ni_flags |= IEEE80211_NODE_SGI20;
 1526         if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
 1527             (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
 1528                 ni->ni_flags |= IEEE80211_NODE_SGI40;
 1529 }
 1530 
 1531 /*
 1532  * Parse and update HT-related state extracted from
 1533  * the HT cap and info ie's.
 1534  */
 1535 int
 1536 ieee80211_ht_updateparams(struct ieee80211_node *ni,
 1537         const uint8_t *htcapie, const uint8_t *htinfoie)
 1538 {
 1539         struct ieee80211vap *vap = ni->ni_vap;
 1540         const struct ieee80211_ie_htinfo *htinfo;
 1541         int htflags;
 1542         int ret = 0;
 1543 
 1544         ieee80211_parse_htcap(ni, htcapie);
 1545         if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
 1546                 htcap_update_mimo_ps(ni);
 1547         htcap_update_shortgi(ni);
 1548 
 1549         if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
 1550                 htinfoie += 4;
 1551         htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
 1552         htinfo_parse(ni, htinfo);
 1553 
 1554         htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
 1555             IEEE80211_CHAN_HT20 : 0;
 1556         /* NB: honor operating mode constraint */
 1557         if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
 1558             (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
 1559                 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
 1560                         htflags = IEEE80211_CHAN_HT40U;
 1561                 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
 1562                         htflags = IEEE80211_CHAN_HT40D;
 1563         }
 1564         if (htinfo_update_chw(ni, htflags))
 1565                 ret = 1;
 1566 
 1567         if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
 1568             (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
 1569                 ni->ni_flags |= IEEE80211_NODE_RIFS;
 1570         else
 1571                 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
 1572 
 1573         return (ret);
 1574 }
 1575 
 1576 /*
 1577  * Parse and update HT-related state extracted from the HT cap ie
 1578  * for a station joining an HT BSS.
 1579  */
 1580 void
 1581 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
 1582 {
 1583         struct ieee80211vap *vap = ni->ni_vap;
 1584         int htflags;
 1585 
 1586         ieee80211_parse_htcap(ni, htcapie);
 1587         if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
 1588                 htcap_update_mimo_ps(ni);
 1589         htcap_update_shortgi(ni);
 1590 
 1591         /* NB: honor operating mode constraint */
 1592         /* XXX 40 MHz intolerant */
 1593         htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
 1594             IEEE80211_CHAN_HT20 : 0;
 1595         if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
 1596             (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
 1597                 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
 1598                         htflags = IEEE80211_CHAN_HT40U;
 1599                 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
 1600                         htflags = IEEE80211_CHAN_HT40D;
 1601         }
 1602         (void) htinfo_update_chw(ni, htflags);
 1603 }
 1604 
 1605 /*
 1606  * Install received HT rate set by parsing the HT cap ie.
 1607  */
 1608 int
 1609 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
 1610 {
 1611         struct ieee80211com *ic = ni->ni_ic;
 1612         struct ieee80211vap *vap = ni->ni_vap;
 1613         const struct ieee80211_ie_htcap *htcap;
 1614         struct ieee80211_htrateset *rs;
 1615         int i, maxequalmcs, maxunequalmcs;
 1616 
 1617         maxequalmcs = ic->ic_txstream * 8 - 1;
 1618         if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
 1619                 if (ic->ic_txstream >= 2)
 1620                         maxunequalmcs = 38;
 1621                 if (ic->ic_txstream >= 3)
 1622                         maxunequalmcs = 52;
 1623                 if (ic->ic_txstream >= 4)
 1624                         maxunequalmcs = 76;
 1625         } else
 1626                 maxunequalmcs = 0;
 1627 
 1628         rs = &ni->ni_htrates;
 1629         memset(rs, 0, sizeof(*rs));
 1630         if (ie != NULL) {
 1631                 if (ie[0] == IEEE80211_ELEMID_VENDOR)
 1632                         ie += 4;
 1633                 htcap = (const struct ieee80211_ie_htcap *) ie;
 1634                 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
 1635                         if (isclr(htcap->hc_mcsset, i))
 1636                                 continue;
 1637                         if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
 1638                                 IEEE80211_NOTE(vap,
 1639                                     IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
 1640                                     "WARNING, HT rate set too large; only "
 1641                                     "using %u rates", IEEE80211_HTRATE_MAXSIZE);
 1642                                 vap->iv_stats.is_rx_rstoobig++;
 1643                                 break;
 1644                         }
 1645                         if (i <= 31 && i > maxequalmcs)
 1646                                 continue;
 1647                         if (i == 32 &&
 1648                             (ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0)
 1649                                 continue;
 1650                         if (i > 32 && i > maxunequalmcs)
 1651                                 continue;
 1652                         rs->rs_rates[rs->rs_nrates++] = i;
 1653                 }
 1654         }
 1655         return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
 1656 }
 1657 
 1658 /*
 1659  * Mark rates in a node's HT rate set as basic according
 1660  * to the information in the supplied HT info ie.
 1661  */
 1662 void
 1663 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
 1664 {
 1665         const struct ieee80211_ie_htinfo *htinfo;
 1666         struct ieee80211_htrateset *rs;
 1667         int i, j;
 1668 
 1669         if (ie[0] == IEEE80211_ELEMID_VENDOR)
 1670                 ie += 4;
 1671         htinfo = (const struct ieee80211_ie_htinfo *) ie;
 1672         rs = &ni->ni_htrates;
 1673         if (rs->rs_nrates == 0) {
 1674                 IEEE80211_NOTE(ni->ni_vap,
 1675                     IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
 1676                     "%s", "WARNING, empty HT rate set");
 1677                 return;
 1678         }
 1679         for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
 1680                 if (isclr(htinfo->hi_basicmcsset, i))
 1681                         continue;
 1682                 for (j = 0; j < rs->rs_nrates; j++)
 1683                         if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
 1684                                 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
 1685         }
 1686 }
 1687 
 1688 static void
 1689 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
 1690 {
 1691         callout_init(&tap->txa_timer, CALLOUT_MPSAFE);
 1692         tap->txa_flags |= IEEE80211_AGGR_SETUP;
 1693 }
 1694 
 1695 static void
 1696 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
 1697 {
 1698         struct ieee80211_node *ni = tap->txa_ni;
 1699         struct ieee80211com *ic = ni->ni_ic;
 1700 
 1701         IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
 1702             tap->txa_ni,
 1703             "%s: called",
 1704             __func__);
 1705 
 1706         KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
 1707             ("txa_flags 0x%x tid %d ac %d", tap->txa_flags, tap->txa_tid,
 1708             TID_TO_WME_AC(tap->txa_tid)));
 1709 
 1710         /*
 1711          * Stop BA stream if setup so driver has a chance
 1712          * to reclaim any resources it might have allocated.
 1713          */
 1714         ic->ic_addba_stop(ni, tap);
 1715         /*
 1716          * Stop any pending BAR transmit.
 1717          */
 1718         bar_stop_timer(tap);
 1719 
 1720         tap->txa_lastsample = 0;
 1721         tap->txa_avgpps = 0;
 1722         /* NB: clearing NAK means we may re-send ADDBA */ 
 1723         tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
 1724 }
 1725 
 1726 /*
 1727  * ADDBA response timeout.
 1728  *
 1729  * If software aggregation and per-TID queue management was done here,
 1730  * that queue would be unpaused after the ADDBA timeout occurs.
 1731  */
 1732 static void
 1733 addba_timeout(void *arg)
 1734 {
 1735         struct ieee80211_tx_ampdu *tap = arg;
 1736         struct ieee80211_node *ni = tap->txa_ni;
 1737         struct ieee80211com *ic = ni->ni_ic;
 1738 
 1739         /* XXX ? */
 1740         tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
 1741         tap->txa_attempts++;
 1742         ic->ic_addba_response_timeout(ni, tap);
 1743 }
 1744 
 1745 static void
 1746 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
 1747 {
 1748         /* XXX use CALLOUT_PENDING instead? */
 1749         callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
 1750             addba_timeout, tap);
 1751         tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
 1752         tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
 1753 }
 1754 
 1755 static void
 1756 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
 1757 {
 1758         /* XXX use CALLOUT_PENDING instead? */
 1759         if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
 1760                 callout_stop(&tap->txa_timer);
 1761                 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
 1762         }
 1763 }
 1764 
 1765 static void
 1766 null_addba_response_timeout(struct ieee80211_node *ni,
 1767     struct ieee80211_tx_ampdu *tap)
 1768 {
 1769 }
 1770 
 1771 /*
 1772  * Default method for requesting A-MPDU tx aggregation.
 1773  * We setup the specified state block and start a timer
 1774  * to wait for an ADDBA response frame.
 1775  */
 1776 static int
 1777 ieee80211_addba_request(struct ieee80211_node *ni,
 1778         struct ieee80211_tx_ampdu *tap,
 1779         int dialogtoken, int baparamset, int batimeout)
 1780 {
 1781         int bufsiz;
 1782 
 1783         /* XXX locking */
 1784         tap->txa_token = dialogtoken;
 1785         tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
 1786         bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
 1787         tap->txa_wnd = (bufsiz == 0) ?
 1788             IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
 1789         addba_start_timeout(tap);
 1790         return 1;
 1791 }
 1792 
 1793 /*
 1794  * Default method for processing an A-MPDU tx aggregation
 1795  * response.  We shutdown any pending timer and update the
 1796  * state block according to the reply.
 1797  */
 1798 static int
 1799 ieee80211_addba_response(struct ieee80211_node *ni,
 1800         struct ieee80211_tx_ampdu *tap,
 1801         int status, int baparamset, int batimeout)
 1802 {
 1803         int bufsiz, tid;
 1804 
 1805         /* XXX locking */
 1806         addba_stop_timeout(tap);
 1807         if (status == IEEE80211_STATUS_SUCCESS) {
 1808                 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
 1809                 /* XXX override our request? */
 1810                 tap->txa_wnd = (bufsiz == 0) ?
 1811                     IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
 1812                 /* XXX AC/TID */
 1813                 tid = MS(baparamset, IEEE80211_BAPS_TID);
 1814                 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
 1815                 tap->txa_attempts = 0;
 1816         } else {
 1817                 /* mark tid so we don't try again */
 1818                 tap->txa_flags |= IEEE80211_AGGR_NAK;
 1819         }
 1820         return 1;
 1821 }
 1822 
 1823 /*
 1824  * Default method for stopping A-MPDU tx aggregation.
 1825  * Any timer is cleared and we drain any pending frames.
 1826  */
 1827 static void
 1828 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
 1829 {
 1830         /* XXX locking */
 1831         addba_stop_timeout(tap);
 1832         if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
 1833                 /* XXX clear aggregation queue */
 1834                 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
 1835         }
 1836         tap->txa_attempts = 0;
 1837 }
 1838 
 1839 /*
 1840  * Process a received action frame using the default aggregation
 1841  * policy.  We intercept ADDBA-related frames and use them to
 1842  * update our aggregation state.  All other frames are passed up
 1843  * for processing by ieee80211_recv_action.
 1844  */
 1845 static int
 1846 ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
 1847         const struct ieee80211_frame *wh,
 1848         const uint8_t *frm, const uint8_t *efrm)
 1849 {
 1850         struct ieee80211com *ic = ni->ni_ic;
 1851         struct ieee80211vap *vap = ni->ni_vap;
 1852         struct ieee80211_rx_ampdu *rap;
 1853         uint8_t dialogtoken;
 1854         uint16_t baparamset, batimeout, baseqctl;
 1855         uint16_t args[5];
 1856         int tid;
 1857 
 1858         dialogtoken = frm[2];
 1859         baparamset = LE_READ_2(frm+3);
 1860         batimeout = LE_READ_2(frm+5);
 1861         baseqctl = LE_READ_2(frm+7);
 1862 
 1863         tid = MS(baparamset, IEEE80211_BAPS_TID);
 1864 
 1865         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 1866             "recv ADDBA request: dialogtoken %u baparamset 0x%x "
 1867             "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d",
 1868             dialogtoken, baparamset,
 1869             tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ),
 1870             batimeout,
 1871             MS(baseqctl, IEEE80211_BASEQ_START),
 1872             MS(baseqctl, IEEE80211_BASEQ_FRAG));
 1873 
 1874         rap = &ni->ni_rx_ampdu[tid];
 1875 
 1876         /* Send ADDBA response */
 1877         args[0] = dialogtoken;
 1878         /*
 1879          * NB: We ack only if the sta associated with HT and
 1880          * the ap is configured to do AMPDU rx (the latter
 1881          * violates the 11n spec and is mostly for testing).
 1882          */
 1883         if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
 1884             (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
 1885                 /* XXX handle ampdu_rx_start failure */
 1886                 ic->ic_ampdu_rx_start(ni, rap,
 1887                     baparamset, batimeout, baseqctl);
 1888 
 1889                 args[1] = IEEE80211_STATUS_SUCCESS;
 1890         } else {
 1891                 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1892                     ni, "reject ADDBA request: %s",
 1893                     ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
 1894                        "administratively disabled" :
 1895                        "not negotiated for station");
 1896                 vap->iv_stats.is_addba_reject++;
 1897                 args[1] = IEEE80211_STATUS_UNSPECIFIED;
 1898         }
 1899         /* XXX honor rap flags? */
 1900         args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
 1901                 | SM(tid, IEEE80211_BAPS_TID)
 1902                 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
 1903                 ;
 1904         args[3] = 0;
 1905         args[4] = 0;
 1906         ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
 1907                 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
 1908         return 0;
 1909 }
 1910 
 1911 static int
 1912 ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
 1913         const struct ieee80211_frame *wh,
 1914         const uint8_t *frm, const uint8_t *efrm)
 1915 {
 1916         struct ieee80211com *ic = ni->ni_ic;
 1917         struct ieee80211vap *vap = ni->ni_vap;
 1918         struct ieee80211_tx_ampdu *tap;
 1919         uint8_t dialogtoken, policy;
 1920         uint16_t baparamset, batimeout, code;
 1921         int tid, bufsiz;
 1922 
 1923         dialogtoken = frm[2];
 1924         code = LE_READ_2(frm+3);
 1925         baparamset = LE_READ_2(frm+5);
 1926         tid = MS(baparamset, IEEE80211_BAPS_TID);
 1927         bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
 1928         policy = MS(baparamset, IEEE80211_BAPS_POLICY);
 1929         batimeout = LE_READ_2(frm+7);
 1930 
 1931         tap = &ni->ni_tx_ampdu[tid];
 1932         if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
 1933                 IEEE80211_DISCARD_MAC(vap,
 1934                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1935                     ni->ni_macaddr, "ADDBA response",
 1936                     "no pending ADDBA, tid %d dialogtoken %u "
 1937                     "code %d", tid, dialogtoken, code);
 1938                 vap->iv_stats.is_addba_norequest++;
 1939                 return 0;
 1940         }
 1941         if (dialogtoken != tap->txa_token) {
 1942                 IEEE80211_DISCARD_MAC(vap,
 1943                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1944                     ni->ni_macaddr, "ADDBA response",
 1945                     "dialogtoken mismatch: waiting for %d, "
 1946                     "received %d, tid %d code %d",
 1947                     tap->txa_token, dialogtoken, tid, code);
 1948                 vap->iv_stats.is_addba_badtoken++;
 1949                 return 0;
 1950         }
 1951         /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
 1952         if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
 1953                 IEEE80211_DISCARD_MAC(vap,
 1954                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1955                     ni->ni_macaddr, "ADDBA response",
 1956                     "policy mismatch: expecting %s, "
 1957                     "received %s, tid %d code %d",
 1958                     tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
 1959                     policy, tid, code);
 1960                 vap->iv_stats.is_addba_badpolicy++;
 1961                 return 0;
 1962         }
 1963 #if 0
 1964         /* XXX we take MIN in ieee80211_addba_response */
 1965         if (bufsiz > IEEE80211_AGGR_BAWMAX) {
 1966                 IEEE80211_DISCARD_MAC(vap,
 1967                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1968                     ni->ni_macaddr, "ADDBA response",
 1969                     "BA window too large: max %d, "
 1970                     "received %d, tid %d code %d",
 1971                     bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
 1972                 vap->iv_stats.is_addba_badbawinsize++;
 1973                 return 0;
 1974         }
 1975 #endif
 1976         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 1977             "recv ADDBA response: dialogtoken %u code %d "
 1978             "baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
 1979             dialogtoken, code, baparamset, tid, bufsiz,
 1980             batimeout);
 1981         ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
 1982         return 0;
 1983 }
 1984 
 1985 static int
 1986 ht_recv_action_ba_delba(struct ieee80211_node *ni,
 1987         const struct ieee80211_frame *wh,
 1988         const uint8_t *frm, const uint8_t *efrm)
 1989 {
 1990         struct ieee80211com *ic = ni->ni_ic;
 1991         struct ieee80211_rx_ampdu *rap;
 1992         struct ieee80211_tx_ampdu *tap;
 1993         uint16_t baparamset, code;
 1994         int tid;
 1995 
 1996         baparamset = LE_READ_2(frm+2);
 1997         code = LE_READ_2(frm+4);
 1998 
 1999         tid = MS(baparamset, IEEE80211_DELBAPS_TID);
 2000 
 2001         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2002             "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
 2003             "code %d", baparamset, tid,
 2004             MS(baparamset, IEEE80211_DELBAPS_INIT), code);
 2005 
 2006         if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
 2007                 tap = &ni->ni_tx_ampdu[tid];
 2008                 ic->ic_addba_stop(ni, tap);
 2009         } else {
 2010                 rap = &ni->ni_rx_ampdu[tid];
 2011                 ic->ic_ampdu_rx_stop(ni, rap);
 2012         }
 2013         return 0;
 2014 }
 2015 
 2016 static int
 2017 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
 2018         const struct ieee80211_frame *wh,
 2019         const uint8_t *frm, const uint8_t *efrm)
 2020 {
 2021         int chw;
 2022 
 2023         chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20;
 2024 
 2025         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2026             "%s: HT txchwidth, width %d%s",
 2027             __func__, chw, ni->ni_chw != chw ? "*" : "");
 2028         if (chw != ni->ni_chw) {
 2029                 ni->ni_chw = chw;
 2030                 /* XXX notify on change */
 2031         }
 2032         return 0;
 2033 }
 2034 
 2035 static int
 2036 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
 2037         const struct ieee80211_frame *wh,
 2038         const uint8_t *frm, const uint8_t *efrm)
 2039 {
 2040         const struct ieee80211_action_ht_mimopowersave *mps =
 2041             (const struct ieee80211_action_ht_mimopowersave *) frm;
 2042 
 2043         /* XXX check iv_htcaps */
 2044         if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
 2045                 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
 2046         else
 2047                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
 2048         if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
 2049                 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
 2050         else
 2051                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
 2052         /* XXX notify on change */
 2053         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2054             "%s: HT MIMO PS (%s%s)", __func__,
 2055             (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ?  "on" : "off",
 2056             (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ?  "+rts" : ""
 2057         );
 2058         return 0;
 2059 }
 2060 
 2061 /*
 2062  * Transmit processing.
 2063  */
 2064 
 2065 /*
 2066  * Check if A-MPDU should be requested/enabled for a stream.
 2067  * We require a traffic rate above a per-AC threshold and we
 2068  * also handle backoff from previous failed attempts.
 2069  *
 2070  * Drivers may override this method to bring in information
 2071  * such as link state conditions in making the decision.
 2072  */
 2073 static int
 2074 ieee80211_ampdu_enable(struct ieee80211_node *ni,
 2075         struct ieee80211_tx_ampdu *tap)
 2076 {
 2077         struct ieee80211vap *vap = ni->ni_vap;
 2078 
 2079         if (tap->txa_avgpps <
 2080             vap->iv_ampdu_mintraffic[TID_TO_WME_AC(tap->txa_tid)])
 2081                 return 0;
 2082         /* XXX check rssi? */
 2083         if (tap->txa_attempts >= ieee80211_addba_maxtries &&
 2084             ticks < tap->txa_nextrequest) {
 2085                 /*
 2086                  * Don't retry too often; txa_nextrequest is set
 2087                  * to the minimum interval we'll retry after
 2088                  * ieee80211_addba_maxtries failed attempts are made.
 2089                  */
 2090                 return 0;
 2091         }
 2092         IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
 2093             "enable AMPDU on tid %d (%s), avgpps %d pkts %d",
 2094             tap->txa_tid, ieee80211_wme_acnames[TID_TO_WME_AC(tap->txa_tid)],
 2095             tap->txa_avgpps, tap->txa_pkts);
 2096         return 1;
 2097 }
 2098 
 2099 /*
 2100  * Request A-MPDU tx aggregation.  Setup local state and
 2101  * issue an ADDBA request.  BA use will only happen after
 2102  * the other end replies with ADDBA response.
 2103  */
 2104 int
 2105 ieee80211_ampdu_request(struct ieee80211_node *ni,
 2106         struct ieee80211_tx_ampdu *tap)
 2107 {
 2108         struct ieee80211com *ic = ni->ni_ic;
 2109         uint16_t args[5];
 2110         int tid, dialogtoken;
 2111         static int tokens = 0;  /* XXX */
 2112 
 2113         /* XXX locking */
 2114         if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
 2115                 /* do deferred setup of state */
 2116                 ampdu_tx_setup(tap);
 2117         }
 2118         /* XXX hack for not doing proper locking */
 2119         tap->txa_flags &= ~IEEE80211_AGGR_NAK;
 2120 
 2121         dialogtoken = (tokens+1) % 63;          /* XXX */
 2122         tid = tap->txa_tid;
 2123         tap->txa_start = ni->ni_txseqs[tid];
 2124 
 2125         args[0] = dialogtoken;
 2126         args[1] = 0;    /* NB: status code not used */
 2127         args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
 2128                 | SM(tid, IEEE80211_BAPS_TID)
 2129                 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
 2130                 ;
 2131         args[3] = 0;    /* batimeout */
 2132         /* NB: do first so there's no race against reply */
 2133         if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) {
 2134                 /* unable to setup state, don't make request */
 2135                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2136                     ni, "%s: could not setup BA stream for TID %d AC %d",
 2137                     __func__, tap->txa_tid, TID_TO_WME_AC(tap->txa_tid));
 2138                 /* defer next try so we don't slam the driver with requests */
 2139                 tap->txa_attempts = ieee80211_addba_maxtries;
 2140                 /* NB: check in case driver wants to override */
 2141                 if (tap->txa_nextrequest <= ticks)
 2142                         tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
 2143                 return 0;
 2144         }
 2145         tokens = dialogtoken;                   /* allocate token */
 2146         /* NB: after calling ic_addba_request so driver can set txa_start */
 2147         args[4] = SM(tap->txa_start, IEEE80211_BASEQ_START)
 2148                 | SM(0, IEEE80211_BASEQ_FRAG)
 2149                 ;
 2150         return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
 2151                 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
 2152 }
 2153 
 2154 /*
 2155  * Terminate an AMPDU tx stream.  State is reclaimed
 2156  * and the peer notified with a DelBA Action frame.
 2157  */
 2158 void
 2159 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
 2160         int reason)
 2161 {
 2162         struct ieee80211com *ic = ni->ni_ic;
 2163         struct ieee80211vap *vap = ni->ni_vap;
 2164         uint16_t args[4];
 2165 
 2166         /* XXX locking */
 2167         tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
 2168         if (IEEE80211_AMPDU_RUNNING(tap)) {
 2169                 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 2170                     ni, "%s: stop BA stream for TID %d (reason %d)",
 2171                     __func__, tap->txa_tid, reason);
 2172                 vap->iv_stats.is_ampdu_stop++;
 2173 
 2174                 ic->ic_addba_stop(ni, tap);
 2175                 args[0] = tap->txa_tid;
 2176                 args[1] = IEEE80211_DELBAPS_INIT;
 2177                 args[2] = reason;                       /* XXX reason code */
 2178                 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
 2179                         IEEE80211_ACTION_BA_DELBA, args);
 2180         } else {
 2181                 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 2182                     ni, "%s: BA stream for TID %d not running (reason %d)",
 2183                     __func__, tap->txa_tid, reason);
 2184                 vap->iv_stats.is_ampdu_stop_failed++;
 2185         }
 2186 }
 2187 
 2188 /* XXX */
 2189 static void bar_start_timer(struct ieee80211_tx_ampdu *tap);
 2190 
 2191 static void
 2192 bar_timeout(void *arg)
 2193 {
 2194         struct ieee80211_tx_ampdu *tap = arg;
 2195         struct ieee80211_node *ni = tap->txa_ni;
 2196 
 2197         KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
 2198             ("bar/addba collision, flags 0x%x", tap->txa_flags));
 2199 
 2200         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2201             ni, "%s: tid %u flags 0x%x attempts %d", __func__,
 2202             tap->txa_tid, tap->txa_flags, tap->txa_attempts);
 2203 
 2204         /* guard against race with bar_tx_complete */
 2205         if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
 2206                 return;
 2207         /* XXX ? */
 2208         if (tap->txa_attempts >= ieee80211_bar_maxtries) {
 2209                 struct ieee80211com *ic = ni->ni_ic;
 2210 
 2211                 ni->ni_vap->iv_stats.is_ampdu_bar_tx_fail++;
 2212                 /*
 2213                  * If (at least) the last BAR TX timeout was due to
 2214                  * an ieee80211_send_bar() failures, then we need
 2215                  * to make sure we notify the driver that a BAR
 2216                  * TX did occur and fail.  This gives the driver
 2217                  * a chance to undo any queue pause that may
 2218                  * have occured.
 2219                  */
 2220                 ic->ic_bar_response(ni, tap, 1);
 2221                 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
 2222         } else {
 2223                 ni->ni_vap->iv_stats.is_ampdu_bar_tx_retry++;
 2224                 if (ieee80211_send_bar(ni, tap, tap->txa_seqpending) != 0) {
 2225                         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2226                             ni, "%s: failed to TX, starting timer\n",
 2227                             __func__);
 2228                         /*
 2229                          * If ieee80211_send_bar() fails here, the
 2230                          * timer may have stopped and/or the pending
 2231                          * flag may be clear.  Because of this,
 2232                          * fake the BARPEND and reset the timer.
 2233                          * A retransmission attempt will then occur
 2234                          * during the next timeout.
 2235                          */
 2236                         /* XXX locking */
 2237                         tap->txa_flags |= IEEE80211_AGGR_BARPEND;
 2238                         bar_start_timer(tap);
 2239                 }
 2240         }
 2241 }
 2242 
 2243 static void
 2244 bar_start_timer(struct ieee80211_tx_ampdu *tap)
 2245 {
 2246         IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
 2247             tap->txa_ni,
 2248             "%s: called",
 2249             __func__);
 2250         callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
 2251 }
 2252 
 2253 static void
 2254 bar_stop_timer(struct ieee80211_tx_ampdu *tap)
 2255 {
 2256         IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
 2257             tap->txa_ni,
 2258             "%s: called",
 2259             __func__);
 2260         callout_stop(&tap->txa_timer);
 2261 }
 2262 
 2263 static void
 2264 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
 2265 {
 2266         struct ieee80211_tx_ampdu *tap = arg;
 2267 
 2268         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2269             ni, "%s: tid %u flags 0x%x pending %d status %d",
 2270             __func__, tap->txa_tid, tap->txa_flags,
 2271             callout_pending(&tap->txa_timer), status);
 2272 
 2273         ni->ni_vap->iv_stats.is_ampdu_bar_tx++;
 2274         /* XXX locking */
 2275         if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
 2276             callout_pending(&tap->txa_timer)) {
 2277                 struct ieee80211com *ic = ni->ni_ic;
 2278 
 2279                 if (status == 0)                /* ACK'd */
 2280                         bar_stop_timer(tap);
 2281                 ic->ic_bar_response(ni, tap, status);
 2282                 /* NB: just let timer expire so we pace requests */
 2283         }
 2284 }
 2285 
 2286 static void
 2287 ieee80211_bar_response(struct ieee80211_node *ni,
 2288         struct ieee80211_tx_ampdu *tap, int status)
 2289 {
 2290 
 2291         IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
 2292             tap->txa_ni,
 2293             "%s: called",
 2294             __func__);
 2295         if (status == 0) {              /* got ACK */
 2296                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2297                     ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
 2298                     tap->txa_start,
 2299                     IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
 2300                     tap->txa_qframes, tap->txa_seqpending,
 2301                     tap->txa_tid);
 2302 
 2303                 /* NB: timer already stopped in bar_tx_complete */
 2304                 tap->txa_start = tap->txa_seqpending;
 2305                 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
 2306         }
 2307 }
 2308 
 2309 /*
 2310  * Transmit a BAR frame to the specified node.  The
 2311  * BAR contents are drawn from the supplied aggregation
 2312  * state associated with the node.
 2313  *
 2314  * NB: we only handle immediate ACK w/ compressed bitmap.
 2315  */
 2316 int
 2317 ieee80211_send_bar(struct ieee80211_node *ni,
 2318         struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
 2319 {
 2320 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
 2321         struct ieee80211vap *vap = ni->ni_vap;
 2322         struct ieee80211com *ic = ni->ni_ic;
 2323         struct ieee80211_frame_bar *bar;
 2324         struct mbuf *m;
 2325         uint16_t barctl, barseqctl;
 2326         uint8_t *frm;
 2327         int tid, ret;
 2328 
 2329 
 2330         IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
 2331             tap->txa_ni,
 2332             "%s: called",
 2333             __func__);
 2334 
 2335         if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
 2336                 /* no ADDBA response, should not happen */
 2337                 /* XXX stat+msg */
 2338                 return EINVAL;
 2339         }
 2340         /* XXX locking */
 2341         bar_stop_timer(tap);
 2342 
 2343         ieee80211_ref_node(ni);
 2344 
 2345         m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
 2346         if (m == NULL)
 2347                 senderr(ENOMEM, is_tx_nobuf);
 2348 
 2349         if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
 2350                 m_freem(m);
 2351                 senderr(ENOMEM, is_tx_nobuf);   /* XXX */
 2352                 /* NOTREACHED */
 2353         }
 2354 
 2355         bar = mtod(m, struct ieee80211_frame_bar *);
 2356         bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
 2357                 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
 2358         bar->i_fc[1] = 0;
 2359         IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
 2360         IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
 2361 
 2362         tid = tap->txa_tid;
 2363         barctl  = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
 2364                         0 : IEEE80211_BAR_NOACK)
 2365                 | IEEE80211_BAR_COMP
 2366                 | SM(tid, IEEE80211_BAR_TID)
 2367                 ;
 2368         barseqctl = SM(seq, IEEE80211_BAR_SEQ_START);
 2369         /* NB: known to have proper alignment */
 2370         bar->i_ctl = htole16(barctl);
 2371         bar->i_seq = htole16(barseqctl);
 2372         m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
 2373 
 2374         M_WME_SETAC(m, WME_AC_VO);
 2375 
 2376         IEEE80211_NODE_STAT(ni, tx_mgmt);       /* XXX tx_ctl? */
 2377 
 2378         /* XXX locking */
 2379         /* init/bump attempts counter */
 2380         if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
 2381                 tap->txa_attempts = 1;
 2382         else
 2383                 tap->txa_attempts++;
 2384         tap->txa_seqpending = seq;
 2385         tap->txa_flags |= IEEE80211_AGGR_BARPEND;
 2386 
 2387         IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
 2388             ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
 2389             tid, barctl, seq, tap->txa_attempts);
 2390 
 2391         /*
 2392          * ic_raw_xmit will free the node reference
 2393          * regardless of queue/TX success or failure.
 2394          */
 2395         IEEE80211_TX_LOCK(ic);
 2396         ret = ieee80211_raw_output(vap, ni, m, NULL);
 2397         IEEE80211_TX_UNLOCK(ic);
 2398         if (ret != 0) {
 2399                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
 2400                     ni, "send BAR: failed: (ret = %d)\n",
 2401                     ret);
 2402                 /* xmit failed, clear state flag */
 2403                 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
 2404                 vap->iv_stats.is_ampdu_bar_tx_fail++;
 2405                 return ret;
 2406         }
 2407         /* XXX hack against tx complete happening before timer is started */
 2408         if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
 2409                 bar_start_timer(tap);
 2410         return 0;
 2411 bad:
 2412         IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
 2413             tap->txa_ni,
 2414             "%s: bad! ret=%d",
 2415             __func__, ret);
 2416         vap->iv_stats.is_ampdu_bar_tx_fail++;
 2417         ieee80211_free_node(ni);
 2418         return ret;
 2419 #undef senderr
 2420 }
 2421 
 2422 static int
 2423 ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
 2424 {
 2425         struct ieee80211_bpf_params params;
 2426 
 2427         memset(&params, 0, sizeof(params));
 2428         params.ibp_pri = WME_AC_VO;
 2429         params.ibp_rate0 = ni->ni_txparms->mgmtrate;
 2430         /* NB: we know all frames are unicast */
 2431         params.ibp_try0 = ni->ni_txparms->maxretry;
 2432         params.ibp_power = ni->ni_txpower;
 2433         return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
 2434              &params);
 2435 }
 2436 
 2437 #define ADDSHORT(frm, v) do {                   \
 2438         frm[0] = (v) & 0xff;                    \
 2439         frm[1] = (v) >> 8;                      \
 2440         frm += 2;                               \
 2441 } while (0)
 2442 
 2443 /*
 2444  * Send an action management frame.  The arguments are stuff
 2445  * into a frame without inspection; the caller is assumed to
 2446  * prepare them carefully (e.g. based on the aggregation state).
 2447  */
 2448 static int
 2449 ht_send_action_ba_addba(struct ieee80211_node *ni,
 2450         int category, int action, void *arg0)
 2451 {
 2452         struct ieee80211vap *vap = ni->ni_vap;
 2453         struct ieee80211com *ic = ni->ni_ic;
 2454         uint16_t *args = arg0;
 2455         struct mbuf *m;
 2456         uint8_t *frm;
 2457 
 2458         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2459             "send ADDBA %s: dialogtoken %d status %d "
 2460             "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
 2461             (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
 2462                 "request" : "response",
 2463             args[0], args[1], args[2], MS(args[2], IEEE80211_BAPS_TID),
 2464             args[3], args[4]);
 2465 
 2466         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2467             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2468             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2469         ieee80211_ref_node(ni);
 2470 
 2471         m = ieee80211_getmgtframe(&frm,
 2472             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2473             sizeof(uint16_t)    /* action+category */
 2474             /* XXX may action payload */
 2475             + sizeof(struct ieee80211_action_ba_addbaresponse)
 2476         );
 2477         if (m != NULL) {
 2478                 *frm++ = category;
 2479                 *frm++ = action;
 2480                 *frm++ = args[0];               /* dialog token */
 2481                 if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE)
 2482                         ADDSHORT(frm, args[1]); /* status code */
 2483                 ADDSHORT(frm, args[2]);         /* baparamset */
 2484                 ADDSHORT(frm, args[3]);         /* batimeout */
 2485                 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
 2486                         ADDSHORT(frm, args[4]); /* baseqctl */
 2487                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2488                 return ht_action_output(ni, m);
 2489         } else {
 2490                 vap->iv_stats.is_tx_nobuf++;
 2491                 ieee80211_free_node(ni);
 2492                 return ENOMEM;
 2493         }
 2494 }
 2495 
 2496 static int
 2497 ht_send_action_ba_delba(struct ieee80211_node *ni,
 2498         int category, int action, void *arg0)
 2499 {
 2500         struct ieee80211vap *vap = ni->ni_vap;
 2501         struct ieee80211com *ic = ni->ni_ic;
 2502         uint16_t *args = arg0;
 2503         struct mbuf *m;
 2504         uint16_t baparamset;
 2505         uint8_t *frm;
 2506 
 2507         baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
 2508                    | args[1]
 2509                    ;
 2510         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2511             "send DELBA action: tid %d, initiator %d reason %d",
 2512             args[0], args[1], args[2]);
 2513 
 2514         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2515             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2516             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2517         ieee80211_ref_node(ni);
 2518 
 2519         m = ieee80211_getmgtframe(&frm,
 2520             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2521             sizeof(uint16_t)    /* action+category */
 2522             /* XXX may action payload */
 2523             + sizeof(struct ieee80211_action_ba_addbaresponse)
 2524         );
 2525         if (m != NULL) {
 2526                 *frm++ = category;
 2527                 *frm++ = action;
 2528                 ADDSHORT(frm, baparamset);
 2529                 ADDSHORT(frm, args[2]);         /* reason code */
 2530                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2531                 return ht_action_output(ni, m);
 2532         } else {
 2533                 vap->iv_stats.is_tx_nobuf++;
 2534                 ieee80211_free_node(ni);
 2535                 return ENOMEM;
 2536         }
 2537 }
 2538 
 2539 static int
 2540 ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
 2541         int category, int action, void *arg0)
 2542 {
 2543         struct ieee80211vap *vap = ni->ni_vap;
 2544         struct ieee80211com *ic = ni->ni_ic;
 2545         struct mbuf *m;
 2546         uint8_t *frm;
 2547 
 2548         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2549             "send HT txchwidth: width %d",
 2550             IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
 2551 
 2552         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2553             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2554             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2555         ieee80211_ref_node(ni);
 2556 
 2557         m = ieee80211_getmgtframe(&frm,
 2558             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2559             sizeof(uint16_t)    /* action+category */
 2560             /* XXX may action payload */
 2561             + sizeof(struct ieee80211_action_ba_addbaresponse)
 2562         );
 2563         if (m != NULL) {
 2564                 *frm++ = category;
 2565                 *frm++ = action;
 2566                 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 
 2567                         IEEE80211_A_HT_TXCHWIDTH_2040 :
 2568                         IEEE80211_A_HT_TXCHWIDTH_20;
 2569                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2570                 return ht_action_output(ni, m);
 2571         } else {
 2572                 vap->iv_stats.is_tx_nobuf++;
 2573                 ieee80211_free_node(ni);
 2574                 return ENOMEM;
 2575         }
 2576 }
 2577 #undef ADDSHORT
 2578 
 2579 /*
 2580  * Construct the MCS bit mask for inclusion in an HT capabilities
 2581  * information element.
 2582  */
 2583 static void
 2584 ieee80211_set_mcsset(struct ieee80211com *ic, uint8_t *frm)
 2585 {
 2586         int i;
 2587         uint8_t txparams;
 2588 
 2589         KASSERT((ic->ic_rxstream > 0 && ic->ic_rxstream <= 4),
 2590             ("ic_rxstream %d out of range", ic->ic_rxstream));
 2591         KASSERT((ic->ic_txstream > 0 && ic->ic_txstream <= 4),
 2592             ("ic_txstream %d out of range", ic->ic_txstream));
 2593 
 2594         for (i = 0; i < ic->ic_rxstream * 8; i++)
 2595                 setbit(frm, i);
 2596         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
 2597             (ic->ic_htcaps & IEEE80211_HTC_RXMCS32))
 2598                 setbit(frm, 32);
 2599         if (ic->ic_htcaps & IEEE80211_HTC_RXUNEQUAL) {
 2600                 if (ic->ic_rxstream >= 2) {
 2601                         for (i = 33; i <= 38; i++)
 2602                                 setbit(frm, i);
 2603                 }
 2604                 if (ic->ic_rxstream >= 3) {
 2605                         for (i = 39; i <= 52; i++)
 2606                                 setbit(frm, i);
 2607                 }
 2608                 if (ic->ic_txstream >= 4) {
 2609                         for (i = 53; i <= 76; i++)
 2610                                 setbit(frm, i);
 2611                 }
 2612         }
 2613 
 2614         if (ic->ic_rxstream != ic->ic_txstream) {
 2615                 txparams = 0x1;                 /* TX MCS set defined */
 2616                 txparams |= 0x2;                /* TX RX MCS not equal */
 2617                 txparams |= (ic->ic_txstream - 1) << 2; /* num TX streams */
 2618                 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL)
 2619                         txparams |= 0x16;       /* TX unequal modulation sup */
 2620         } else
 2621                 txparams = 0;
 2622         frm[12] = txparams;
 2623 }
 2624 
 2625 /*
 2626  * Add body of an HTCAP information element.
 2627  */
 2628 static uint8_t *
 2629 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
 2630 {
 2631 #define ADDSHORT(frm, v) do {                   \
 2632         frm[0] = (v) & 0xff;                    \
 2633         frm[1] = (v) >> 8;                      \
 2634         frm += 2;                               \
 2635 } while (0)
 2636         struct ieee80211com *ic = ni->ni_ic;
 2637         struct ieee80211vap *vap = ni->ni_vap;
 2638         uint16_t caps, extcaps;
 2639         int rxmax, density;
 2640 
 2641         /* HT capabilities */
 2642         caps = vap->iv_htcaps & 0xffff;
 2643         /*
 2644          * Note channel width depends on whether we are operating as
 2645          * a sta or not.  When operating as a sta we are generating
 2646          * a request based on our desired configuration.  Otherwise
 2647          * we are operational and the channel attributes identify
 2648          * how we've been setup (which might be different if a fixed
 2649          * channel is specified).
 2650          */
 2651         if (vap->iv_opmode == IEEE80211_M_STA) {
 2652                 /* override 20/40 use based on config */
 2653                 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
 2654                         caps |= IEEE80211_HTCAP_CHWIDTH40;
 2655                 else
 2656                         caps &= ~IEEE80211_HTCAP_CHWIDTH40;
 2657                 /* use advertised setting (XXX locally constraint) */
 2658                 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
 2659                 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
 2660 
 2661                 /*
 2662                  * NB: Hardware might support HT40 on some but not all
 2663                  * channels. We can't determine this earlier because only
 2664                  * after association the channel is upgraded to HT based
 2665                  * on the negotiated capabilities.
 2666                  */
 2667                 if (ni->ni_chan != IEEE80211_CHAN_ANYC &&
 2668                     findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40U) == NULL &&
 2669                     findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40D) == NULL)
 2670                         caps &= ~IEEE80211_HTCAP_CHWIDTH40;
 2671         } else {
 2672                 /* override 20/40 use based on current channel */
 2673                 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
 2674                         caps |= IEEE80211_HTCAP_CHWIDTH40;
 2675                 else
 2676                         caps &= ~IEEE80211_HTCAP_CHWIDTH40;
 2677                 rxmax = vap->iv_ampdu_rxmax;
 2678                 density = vap->iv_ampdu_density;
 2679         }
 2680         /* adjust short GI based on channel and config */
 2681         if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
 2682                 caps &= ~IEEE80211_HTCAP_SHORTGI20;
 2683         if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
 2684             (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
 2685                 caps &= ~IEEE80211_HTCAP_SHORTGI40;
 2686         ADDSHORT(frm, caps);
 2687 
 2688         /* HT parameters */
 2689         *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
 2690              | SM(density, IEEE80211_HTCAP_MPDUDENSITY)
 2691              ;
 2692         frm++;
 2693 
 2694         /* pre-zero remainder of ie */
 2695         memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 
 2696                 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
 2697 
 2698         /* supported MCS set */
 2699         /*
 2700          * XXX: For sta mode the rate set should be restricted based
 2701          * on the AP's capabilities, but ni_htrates isn't setup when
 2702          * we're called to form an AssocReq frame so for now we're
 2703          * restricted to the device capabilities.
 2704          */
 2705         ieee80211_set_mcsset(ni->ni_ic, frm);
 2706 
 2707         frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
 2708                 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
 2709 
 2710         /* HT extended capabilities */
 2711         extcaps = vap->iv_htextcaps & 0xffff;
 2712 
 2713         ADDSHORT(frm, extcaps);
 2714 
 2715         frm += sizeof(struct ieee80211_ie_htcap) -
 2716                 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
 2717 
 2718         return frm;
 2719 #undef ADDSHORT
 2720 }
 2721 
 2722 /*
 2723  * Add 802.11n HT capabilities information element
 2724  */
 2725 uint8_t *
 2726 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
 2727 {
 2728         frm[0] = IEEE80211_ELEMID_HTCAP;
 2729         frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
 2730         return ieee80211_add_htcap_body(frm + 2, ni);
 2731 }
 2732 
 2733 /*
 2734  * Add Broadcom OUI wrapped standard HTCAP ie; this is
 2735  * used for compatibility w/ pre-draft implementations.
 2736  */
 2737 uint8_t *
 2738 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
 2739 {
 2740         frm[0] = IEEE80211_ELEMID_VENDOR;
 2741         frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
 2742         frm[2] = (BCM_OUI >> 0) & 0xff;
 2743         frm[3] = (BCM_OUI >> 8) & 0xff;
 2744         frm[4] = (BCM_OUI >> 16) & 0xff;
 2745         frm[5] = BCM_OUI_HTCAP;
 2746         return ieee80211_add_htcap_body(frm + 6, ni);
 2747 }
 2748 
 2749 /*
 2750  * Construct the MCS bit mask of basic rates
 2751  * for inclusion in an HT information element.
 2752  */
 2753 static void
 2754 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
 2755 {
 2756         int i;
 2757 
 2758         for (i = 0; i < rs->rs_nrates; i++) {
 2759                 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
 2760                 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
 2761                     r < IEEE80211_HTRATE_MAXSIZE) {
 2762                         /* NB: this assumes a particular implementation */
 2763                         setbit(frm, r);
 2764                 }
 2765         }
 2766 }
 2767 
 2768 /*
 2769  * Update the HTINFO ie for a beacon frame.
 2770  */
 2771 void
 2772 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
 2773         struct ieee80211_beacon_offsets *bo)
 2774 {
 2775 #define PROTMODE        (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
 2776         struct ieee80211_node *ni;
 2777         const struct ieee80211_channel *bsschan;
 2778         struct ieee80211com *ic = vap->iv_ic;
 2779         struct ieee80211_ie_htinfo *ht =
 2780            (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
 2781 
 2782         ni = ieee80211_ref_node(vap->iv_bss);
 2783         bsschan = ni->ni_chan;
 2784 
 2785         /* XXX only update on channel change */
 2786         ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
 2787         if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
 2788                 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
 2789         else
 2790                 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
 2791         if (IEEE80211_IS_CHAN_HT40U(bsschan))
 2792                 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
 2793         else if (IEEE80211_IS_CHAN_HT40D(bsschan))
 2794                 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
 2795         else
 2796                 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
 2797         if (IEEE80211_IS_CHAN_HT40(bsschan))
 2798                 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
 2799 
 2800         /* protection mode */
 2801         ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
 2802 
 2803         ieee80211_free_node(ni);
 2804 
 2805         /* XXX propagate to vendor ie's */
 2806 #undef PROTMODE
 2807 }
 2808 
 2809 /*
 2810  * Add body of an HTINFO information element.
 2811  *
 2812  * NB: We don't use struct ieee80211_ie_htinfo because we can
 2813  * be called to fillin both a standard ie and a compat ie that
 2814  * has a vendor OUI at the front.
 2815  */
 2816 static uint8_t *
 2817 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
 2818 {
 2819         struct ieee80211vap *vap = ni->ni_vap;
 2820         struct ieee80211com *ic = ni->ni_ic;
 2821 
 2822         /* pre-zero remainder of ie */
 2823         memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
 2824 
 2825         /* primary/control channel center */
 2826         *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
 2827 
 2828         if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
 2829                 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
 2830         else
 2831                 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
 2832         if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
 2833                 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
 2834         else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
 2835                 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
 2836         else
 2837                 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
 2838         if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
 2839                 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
 2840 
 2841         frm[1] = ic->ic_curhtprotmode;
 2842 
 2843         frm += 5;
 2844 
 2845         /* basic MCS set */
 2846         ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
 2847         frm += sizeof(struct ieee80211_ie_htinfo) -
 2848                 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
 2849         return frm;
 2850 }
 2851 
 2852 /*
 2853  * Add 802.11n HT information information element.
 2854  */
 2855 uint8_t *
 2856 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
 2857 {
 2858         frm[0] = IEEE80211_ELEMID_HTINFO;
 2859         frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
 2860         return ieee80211_add_htinfo_body(frm + 2, ni);
 2861 }
 2862 
 2863 /*
 2864  * Add Broadcom OUI wrapped standard HTINFO ie; this is
 2865  * used for compatibility w/ pre-draft implementations.
 2866  */
 2867 uint8_t *
 2868 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
 2869 {
 2870         frm[0] = IEEE80211_ELEMID_VENDOR;
 2871         frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
 2872         frm[2] = (BCM_OUI >> 0) & 0xff;
 2873         frm[3] = (BCM_OUI >> 8) & 0xff;
 2874         frm[4] = (BCM_OUI >> 16) & 0xff;
 2875         frm[5] = BCM_OUI_HTINFO;
 2876         return ieee80211_add_htinfo_body(frm + 6, ni);
 2877 }

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