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/9.0/sys/net80211/ieee80211_ht.c 225013 2011-08-19 15:21:13Z adrian $");
   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, CTLTYPE_INT | 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, int mode, int ratetype)
  311 {
  312         int mword, rate;
  313 
  314         mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode);
  315         if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
  316                 return (0);
  317         switch (ratetype) {
  318         case 0:
  319                 rate = ieee80211_htrates[index].ht20_rate_800ns;
  320                 break;
  321         case 1:
  322                 rate = ieee80211_htrates[index].ht20_rate_400ns;
  323                 break;
  324         case 2:
  325                 rate = ieee80211_htrates[index].ht40_rate_800ns;
  326                 break;
  327         default:
  328                 rate = ieee80211_htrates[index].ht40_rate_400ns;
  329                 break;
  330         }
  331         return (rate);
  332 }
  333 
  334 static struct printranges {
  335         int     minmcs;
  336         int     maxmcs;
  337         int     txstream;
  338         int     ratetype;
  339         int     htcapflags;
  340 } ranges[] = {
  341         {  0,  7, 1, 0, 0 },
  342         {  8, 15, 2, 0, 0 },
  343         { 16, 23, 3, 0, 0 },
  344         { 24, 31, 4, 0, 0 },
  345         { 32,  0, 1, 2, IEEE80211_HTC_TXMCS32 },
  346         { 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL },
  347         { 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL },
  348         { 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL },
  349         {  0,  0, 0, 0, 0 },
  350 };
  351 
  352 static void
  353 ht_rateprint(struct ieee80211com *ic, int mode, int ratetype)
  354 {
  355         struct ifnet *ifp = ic->ic_ifp;
  356         int minrate, maxrate;
  357         struct printranges *range;
  358 
  359         for (range = ranges; range->txstream != 0; range++) {
  360                 if (ic->ic_txstream < range->txstream)
  361                         continue;
  362                 if (range->htcapflags &&
  363                     (ic->ic_htcaps & range->htcapflags) == 0)
  364                         continue;
  365                 if (ratetype < range->ratetype)
  366                         continue;
  367                 minrate = ht_getrate(ic, range->minmcs, mode, ratetype);
  368                 maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype);
  369                 if (range->maxmcs) {
  370                         if_printf(ifp, "MCS %d-%d: %d%sMbps - %d%sMbps\n",
  371                             range->minmcs, range->maxmcs,
  372                             minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""),
  373                             maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : ""));
  374                 } else {
  375                         if_printf(ifp, "MCS %d: %d%sMbps\n", range->minmcs,
  376                             minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""));
  377                 }
  378         }
  379 }
  380 
  381 static void
  382 ht_announce(struct ieee80211com *ic, int mode)
  383 {
  384         struct ifnet *ifp = ic->ic_ifp;
  385         const char *modestr = ieee80211_phymode_name[mode];
  386 
  387         if_printf(ifp, "%s MCS 20MHz\n", modestr);
  388         ht_rateprint(ic, mode, 0);
  389         if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) {
  390                 if_printf(ifp, "%s MCS 20MHz SGI\n", modestr);
  391                 ht_rateprint(ic, mode, 1);
  392         }
  393         if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
  394                 if_printf(ifp, "%s MCS 40MHz:\n", modestr);
  395                 ht_rateprint(ic, mode, 2);
  396         }
  397         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
  398             (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) {
  399                 if_printf(ifp, "%s MCS 40MHz SGI:\n", modestr);
  400                 ht_rateprint(ic, mode, 3);
  401         }
  402 }
  403 
  404 void
  405 ieee80211_ht_announce(struct ieee80211com *ic)
  406 {
  407         struct ifnet *ifp = ic->ic_ifp;
  408 
  409         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
  410             isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
  411                 if_printf(ifp, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream);
  412         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
  413                 ht_announce(ic, IEEE80211_MODE_11NA);
  414         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
  415                 ht_announce(ic, IEEE80211_MODE_11NG);
  416 }
  417 
  418 static struct ieee80211_htrateset htrateset;
  419 
  420 const struct ieee80211_htrateset *
  421 ieee80211_get_suphtrates(struct ieee80211com *ic,
  422     const struct ieee80211_channel *c)
  423 {
  424 #define ADDRATE(x)      do {                                            \
  425         htrateset.rs_rates[htrateset.rs_nrates] = x;                    \
  426         htrateset.rs_nrates++;                                          \
  427 } while (0)
  428         int i;
  429 
  430         memset(&htrateset, 0, sizeof(struct ieee80211_htrateset));
  431         for (i = 0; i < ic->ic_txstream * 8; i++)
  432                 ADDRATE(i);
  433         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
  434             (ic->ic_htcaps & IEEE80211_HTC_TXMCS32))
  435                 ADDRATE(i);
  436         if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
  437                 if (ic->ic_txstream >= 2) {
  438                          for (i = 33; i <= 38; i++)
  439                                 ADDRATE(i);
  440                 }
  441                 if (ic->ic_txstream >= 3) {
  442                         for (i = 39; i <= 52; i++)
  443                                 ADDRATE(i);
  444                 }
  445                 if (ic->ic_txstream == 4) {
  446                         for (i = 53; i <= 76; i++)
  447                                 ADDRATE(i);
  448                 }
  449         }
  450         return &htrateset;
  451 #undef  ADDRATE
  452 }
  453 
  454 /*
  455  * Receive processing.
  456  */
  457 
  458 /*
  459  * Decap the encapsulated A-MSDU frames and dispatch all but
  460  * the last for delivery.  The last frame is returned for 
  461  * delivery via the normal path.
  462  */
  463 struct mbuf *
  464 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
  465 {
  466         struct ieee80211vap *vap = ni->ni_vap;
  467         int framelen;
  468         struct mbuf *n;
  469 
  470         /* discard 802.3 header inserted by ieee80211_decap */
  471         m_adj(m, sizeof(struct ether_header));
  472 
  473         vap->iv_stats.is_amsdu_decap++;
  474 
  475         for (;;) {
  476                 /*
  477                  * Decap the first frame, bust it apart from the
  478                  * remainder and deliver.  We leave the last frame
  479                  * delivery to the caller (for consistency with other
  480                  * code paths, could also do it here).
  481                  */
  482                 m = ieee80211_decap1(m, &framelen);
  483                 if (m == NULL) {
  484                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  485                             ni->ni_macaddr, "a-msdu", "%s", "decap failed");
  486                         vap->iv_stats.is_amsdu_tooshort++;
  487                         return NULL;
  488                 }
  489                 if (m->m_pkthdr.len == framelen)
  490                         break;
  491                 n = m_split(m, framelen, M_NOWAIT);
  492                 if (n == NULL) {
  493                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  494                             ni->ni_macaddr, "a-msdu",
  495                             "%s", "unable to split encapsulated frames");
  496                         vap->iv_stats.is_amsdu_split++;
  497                         m_freem(m);                     /* NB: must reclaim */
  498                         return NULL;
  499                 }
  500                 vap->iv_deliver_data(vap, ni, m);
  501 
  502                 /*
  503                  * Remove frame contents; each intermediate frame
  504                  * is required to be aligned to a 4-byte boundary.
  505                  */
  506                 m = n;
  507                 m_adj(m, roundup2(framelen, 4) - framelen);     /* padding */
  508         }
  509         return m;                               /* last delivered by caller */
  510 }
  511 
  512 /*
  513  * Purge all frames in the A-MPDU re-order queue.
  514  */
  515 static void
  516 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
  517 {
  518         struct mbuf *m;
  519         int i;
  520 
  521         for (i = 0; i < rap->rxa_wnd; i++) {
  522                 m = rap->rxa_m[i];
  523                 if (m != NULL) {
  524                         rap->rxa_m[i] = NULL;
  525                         rap->rxa_qbytes -= m->m_pkthdr.len;
  526                         m_freem(m);
  527                         if (--rap->rxa_qframes == 0)
  528                                 break;
  529                 }
  530         }
  531         KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
  532             ("lost %u data, %u frames on ampdu rx q",
  533             rap->rxa_qbytes, rap->rxa_qframes));
  534 }
  535 
  536 /*
  537  * Start A-MPDU rx/re-order processing for the specified TID.
  538  */
  539 static int
  540 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
  541         int baparamset, int batimeout, int baseqctl)
  542 {
  543         int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
  544 
  545         if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
  546                 /*
  547                  * AMPDU previously setup and not terminated with a DELBA,
  548                  * flush the reorder q's in case anything remains.
  549                  */
  550                 ampdu_rx_purge(rap);
  551         }
  552         memset(rap, 0, sizeof(*rap));
  553         rap->rxa_wnd = (bufsiz == 0) ?
  554             IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
  555         rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START);
  556         rap->rxa_flags |=  IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
  557 
  558         return 0;
  559 }
  560 
  561 /*
  562  * Stop A-MPDU rx processing for the specified TID.
  563  */
  564 static void
  565 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
  566 {
  567 
  568         ampdu_rx_purge(rap);
  569         rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
  570 }
  571 
  572 /*
  573  * Dispatch a frame from the A-MPDU reorder queue.  The
  574  * frame is fed back into ieee80211_input marked with an
  575  * M_AMPDU_MPDU flag so it doesn't come back to us (it also
  576  * permits ieee80211_input to optimize re-processing).
  577  */
  578 static __inline void
  579 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
  580 {
  581         m->m_flags |= M_AMPDU_MPDU;     /* bypass normal processing */
  582         /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
  583         (void) ieee80211_input(ni, m, 0, 0);
  584 }
  585 
  586 /*
  587  * Dispatch as many frames as possible from the re-order queue.
  588  * Frames will always be "at the front"; we process all frames
  589  * up to the first empty slot in the window.  On completion we
  590  * cleanup state if there are still pending frames in the current
  591  * BA window.  We assume the frame at slot 0 is already handled
  592  * by the caller; we always start at slot 1.
  593  */
  594 static void
  595 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
  596 {
  597         struct ieee80211vap *vap = ni->ni_vap;
  598         struct mbuf *m;
  599         int i;
  600 
  601         /* flush run of frames */
  602         for (i = 1; i < rap->rxa_wnd; i++) {
  603                 m = rap->rxa_m[i];
  604                 if (m == NULL)
  605                         break;
  606                 rap->rxa_m[i] = NULL;
  607                 rap->rxa_qbytes -= m->m_pkthdr.len;
  608                 rap->rxa_qframes--;
  609 
  610                 ampdu_dispatch(ni, m);
  611         }
  612         /*
  613          * If frames remain, copy the mbuf pointers down so
  614          * they correspond to the offsets in the new window.
  615          */
  616         if (rap->rxa_qframes != 0) {
  617                 int n = rap->rxa_qframes, j;
  618                 for (j = i+1; j < rap->rxa_wnd; j++) {
  619                         if (rap->rxa_m[j] != NULL) {
  620                                 rap->rxa_m[j-i] = rap->rxa_m[j];
  621                                 rap->rxa_m[j] = NULL;
  622                                 if (--n == 0)
  623                                         break;
  624                         }
  625                 }
  626                 KASSERT(n == 0, ("lost %d frames", n));
  627                 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
  628         }
  629         /*
  630          * Adjust the start of the BA window to
  631          * reflect the frames just dispatched.
  632          */
  633         rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
  634         vap->iv_stats.is_ampdu_rx_oor += i;
  635 }
  636 
  637 #ifdef IEEE80211_AMPDU_AGE
  638 /*
  639  * Dispatch all frames in the A-MPDU re-order queue.
  640  */
  641 static void
  642 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
  643 {
  644         struct ieee80211vap *vap = ni->ni_vap;
  645         struct mbuf *m;
  646         int i;
  647 
  648         for (i = 0; i < rap->rxa_wnd; i++) {
  649                 m = rap->rxa_m[i];
  650                 if (m == NULL)
  651                         continue;
  652                 rap->rxa_m[i] = NULL;
  653                 rap->rxa_qbytes -= m->m_pkthdr.len;
  654                 rap->rxa_qframes--;
  655                 vap->iv_stats.is_ampdu_rx_oor++;
  656 
  657                 ampdu_dispatch(ni, m);
  658                 if (rap->rxa_qframes == 0)
  659                         break;
  660         }
  661 }
  662 #endif /* IEEE80211_AMPDU_AGE */
  663 
  664 /*
  665  * Dispatch all frames in the A-MPDU re-order queue
  666  * preceding the specified sequence number.  This logic
  667  * handles window moves due to a received MSDU or BAR.
  668  */
  669 static void
  670 ampdu_rx_flush_upto(struct ieee80211_node *ni,
  671         struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
  672 {
  673         struct ieee80211vap *vap = ni->ni_vap;
  674         struct mbuf *m;
  675         ieee80211_seq seqno;
  676         int i;
  677 
  678         /*
  679          * Flush any complete MSDU's with a sequence number lower
  680          * than winstart.  Gaps may exist.  Note that we may actually
  681          * dispatch frames past winstart if a run continues; this is
  682          * an optimization that avoids having to do a separate pass
  683          * to dispatch frames after moving the BA window start.
  684          */
  685         seqno = rap->rxa_start;
  686         for (i = 0; i < rap->rxa_wnd; i++) {
  687                 m = rap->rxa_m[i];
  688                 if (m != NULL) {
  689                         rap->rxa_m[i] = NULL;
  690                         rap->rxa_qbytes -= m->m_pkthdr.len;
  691                         rap->rxa_qframes--;
  692                         vap->iv_stats.is_ampdu_rx_oor++;
  693 
  694                         ampdu_dispatch(ni, m);
  695                 } else {
  696                         if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
  697                                 break;
  698                 }
  699                 seqno = IEEE80211_SEQ_INC(seqno);
  700         }
  701         /*
  702          * If frames remain, copy the mbuf pointers down so
  703          * they correspond to the offsets in the new window.
  704          */
  705         if (rap->rxa_qframes != 0) {
  706                 int n = rap->rxa_qframes, j;
  707 
  708                 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
  709                 KASSERT(rap->rxa_m[0] == NULL,
  710                     ("%s: BA window slot 0 occupied", __func__));
  711                 for (j = i+1; j < rap->rxa_wnd; j++) {
  712                         if (rap->rxa_m[j] != NULL) {
  713                                 rap->rxa_m[j-i] = rap->rxa_m[j];
  714                                 rap->rxa_m[j] = NULL;
  715                                 if (--n == 0)
  716                                         break;
  717                         }
  718                 }
  719                 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
  720                     "BA win <%d:%d> winstart %d",
  721                     __func__, n, rap->rxa_qframes, i, rap->rxa_start,
  722                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  723                     winstart));
  724                 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
  725         }
  726         /*
  727          * Move the start of the BA window; we use the
  728          * sequence number of the last MSDU that was
  729          * passed up the stack+1 or winstart if stopped on
  730          * a gap in the reorder buffer.
  731          */
  732         rap->rxa_start = seqno;
  733 }
  734 
  735 /*
  736  * Process a received QoS data frame for an HT station.  Handle
  737  * A-MPDU reordering: if this frame is received out of order
  738  * and falls within the BA window hold onto it.  Otherwise if
  739  * this frame completes a run, flush any pending frames.  We
  740  * return 1 if the frame is consumed.  A 0 is returned if
  741  * the frame should be processed normally by the caller.
  742  */
  743 int
  744 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
  745 {
  746 #define IEEE80211_FC0_QOSDATA \
  747         (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
  748 #define PROCESS         0       /* caller should process frame */
  749 #define CONSUMED        1       /* frame consumed, caller does nothing */
  750         struct ieee80211vap *vap = ni->ni_vap;
  751         struct ieee80211_qosframe *wh;
  752         struct ieee80211_rx_ampdu *rap;
  753         ieee80211_seq rxseq;
  754         uint8_t tid;
  755         int off;
  756 
  757         KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
  758             ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
  759         KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
  760 
  761         /* NB: m_len known to be sufficient */
  762         wh = mtod(m, struct ieee80211_qosframe *);
  763         if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
  764                 /*
  765                  * Not QoS data, shouldn't get here but just
  766                  * return it to the caller for processing.
  767                  */
  768                 return PROCESS;
  769         }
  770         if (IEEE80211_IS_DSTODS(wh))
  771                 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
  772         else
  773                 tid = wh->i_qos[0];
  774         tid &= IEEE80211_QOS_TID;
  775         rap = &ni->ni_rx_ampdu[tid];
  776         if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
  777                 /*
  778                  * No ADDBA request yet, don't touch.
  779                  */
  780                 return PROCESS;
  781         }
  782         rxseq = le16toh(*(uint16_t *)wh->i_seq);
  783         if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
  784                 /*
  785                  * Fragments are not allowed; toss.
  786                  */
  787                 IEEE80211_DISCARD_MAC(vap,
  788                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
  789                     "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
  790                     wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
  791                 vap->iv_stats.is_ampdu_rx_drop++;
  792                 IEEE80211_NODE_STAT(ni, rx_drop);
  793                 m_freem(m);
  794                 return CONSUMED;
  795         }
  796         rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
  797         rap->rxa_nframes++;
  798 again:
  799         if (rxseq == rap->rxa_start) {
  800                 /*
  801                  * First frame in window.
  802                  */
  803                 if (rap->rxa_qframes != 0) {
  804                         /*
  805                          * Dispatch as many packets as we can.
  806                          */
  807                         KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
  808                         ampdu_dispatch(ni, m);
  809                         ampdu_rx_dispatch(rap, ni);
  810                         return CONSUMED;
  811                 } else {
  812                         /*
  813                          * In order; advance window and notify
  814                          * caller to dispatch directly.
  815                          */
  816                         rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
  817                         return PROCESS;
  818                 }
  819         }
  820         /*
  821          * Frame is out of order; store if in the BA window.
  822          */
  823         /* calculate offset in BA window */
  824         off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
  825         if (off < rap->rxa_wnd) {
  826                 /*
  827                  * Common case (hopefully): in the BA window.
  828                  * Sec 9.10.7.6.2 a) (p.137)
  829                  */
  830 #ifdef IEEE80211_AMPDU_AGE
  831                 /* 
  832                  * Check for frames sitting too long in the reorder queue.
  833                  * This should only ever happen if frames are not delivered
  834                  * without the sender otherwise notifying us (e.g. with a
  835                  * BAR to move the window).  Typically this happens because
  836                  * of vendor bugs that cause the sequence number to jump.
  837                  * When this happens we get a gap in the reorder queue that
  838                  * leaves frame sitting on the queue until they get pushed
  839                  * out due to window moves.  When the vendor does not send
  840                  * BAR this move only happens due to explicit packet sends
  841                  *
  842                  * NB: we only track the time of the oldest frame in the
  843                  * reorder q; this means that if we flush we might push
  844                  * frames that still "new"; if this happens then subsequent
  845                  * frames will result in BA window moves which cost something
  846                  * but is still better than a big throughput dip.
  847                  */
  848                 if (rap->rxa_qframes != 0) {
  849                         /* XXX honor batimeout? */
  850                         if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
  851                                 /*
  852                                  * Too long since we received the first
  853                                  * frame; flush the reorder buffer.
  854                                  */
  855                                 if (rap->rxa_qframes != 0) {
  856                                         vap->iv_stats.is_ampdu_rx_age +=
  857                                             rap->rxa_qframes;
  858                                         ampdu_rx_flush(ni, rap);
  859                                 }
  860                                 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
  861                                 return PROCESS;
  862                         }
  863                 } else {
  864                         /*
  865                          * First frame, start aging timer.
  866                          */
  867                         rap->rxa_age = ticks;
  868                 }
  869 #endif /* IEEE80211_AMPDU_AGE */
  870                 /* save packet */
  871                 if (rap->rxa_m[off] == NULL) {
  872                         rap->rxa_m[off] = m;
  873                         rap->rxa_qframes++;
  874                         rap->rxa_qbytes += m->m_pkthdr.len;
  875                         vap->iv_stats.is_ampdu_rx_reorder++;
  876                 } else {
  877                         IEEE80211_DISCARD_MAC(vap,
  878                             IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
  879                             ni->ni_macaddr, "a-mpdu duplicate",
  880                             "seqno %u tid %u BA win <%u:%u>",
  881                             rxseq, tid, rap->rxa_start,
  882                             IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
  883                         vap->iv_stats.is_rx_dup++;
  884                         IEEE80211_NODE_STAT(ni, rx_dup);
  885                         m_freem(m);
  886                 }
  887                 return CONSUMED;
  888         }
  889         if (off < IEEE80211_SEQ_BA_RANGE) {
  890                 /*
  891                  * Outside the BA window, but within range;
  892                  * flush the reorder q and move the window.
  893                  * Sec 9.10.7.6.2 b) (p.138)
  894                  */
  895                 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
  896                     "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
  897                     rap->rxa_start,
  898                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  899                     rap->rxa_qframes, rxseq, tid);
  900                 vap->iv_stats.is_ampdu_rx_move++;
  901 
  902                 /*
  903                  * The spec says to flush frames up to but not including:
  904                  *      WinStart_B = rxseq - rap->rxa_wnd + 1
  905                  * Then insert the frame or notify the caller to process
  906                  * it immediately.  We can safely do this by just starting
  907                  * over again because we know the frame will now be within
  908                  * the BA window.
  909                  */
  910                 /* NB: rxa_wnd known to be >0 */
  911                 ampdu_rx_flush_upto(ni, rap,
  912                     IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
  913                 goto again;
  914         } else {
  915                 /*
  916                  * Outside the BA window and out of range; toss.
  917                  * Sec 9.10.7.6.2 c) (p.138)
  918                  */
  919                 IEEE80211_DISCARD_MAC(vap,
  920                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
  921                     "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
  922                     rap->rxa_start,
  923                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  924                     rap->rxa_qframes, rxseq, tid,
  925                     wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
  926                 vap->iv_stats.is_ampdu_rx_drop++;
  927                 IEEE80211_NODE_STAT(ni, rx_drop);
  928                 m_freem(m);
  929                 return CONSUMED;
  930         }
  931 #undef CONSUMED
  932 #undef PROCESS
  933 #undef IEEE80211_FC0_QOSDATA
  934 }
  935 
  936 /*
  937  * Process a BAR ctl frame.  Dispatch all frames up to
  938  * the sequence number of the frame.  If this frame is
  939  * out of range it's discarded.
  940  */
  941 void
  942 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
  943 {
  944         struct ieee80211vap *vap = ni->ni_vap;
  945         struct ieee80211_frame_bar *wh;
  946         struct ieee80211_rx_ampdu *rap;
  947         ieee80211_seq rxseq;
  948         int tid, off;
  949 
  950         if (!ieee80211_recv_bar_ena) {
  951 #if 0
  952                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
  953                     ni->ni_macaddr, "BAR", "%s", "processing disabled");
  954 #endif
  955                 vap->iv_stats.is_ampdu_bar_bad++;
  956                 return;
  957         }
  958         wh = mtod(m0, struct ieee80211_frame_bar *);
  959         /* XXX check basic BAR */
  960         tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
  961         rap = &ni->ni_rx_ampdu[tid];
  962         if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
  963                 /*
  964                  * No ADDBA request yet, don't touch.
  965                  */
  966                 IEEE80211_DISCARD_MAC(vap,
  967                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
  968                     ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
  969                 vap->iv_stats.is_ampdu_bar_bad++;
  970                 return;
  971         }
  972         vap->iv_stats.is_ampdu_bar_rx++;
  973         rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
  974         if (rxseq == rap->rxa_start)
  975                 return;
  976         /* calculate offset in BA window */
  977         off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
  978         if (off < IEEE80211_SEQ_BA_RANGE) {
  979                 /*
  980                  * Flush the reorder q up to rxseq and move the window.
  981                  * Sec 9.10.7.6.3 a) (p.138)
  982                  */
  983                 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
  984                     "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
  985                     rap->rxa_start,
  986                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  987                     rap->rxa_qframes, rxseq, tid);
  988                 vap->iv_stats.is_ampdu_bar_move++;
  989 
  990                 ampdu_rx_flush_upto(ni, rap, rxseq);
  991                 if (off >= rap->rxa_wnd) {
  992                         /*
  993                          * BAR specifies a window start to the right of BA
  994                          * window; we must move it explicitly since
  995                          * ampdu_rx_flush_upto will not.
  996                          */
  997                         rap->rxa_start = rxseq;
  998                 }
  999         } else {
 1000                 /*
 1001                  * Out of range; toss.
 1002                  * Sec 9.10.7.6.3 b) (p.138)
 1003                  */
 1004                 IEEE80211_DISCARD_MAC(vap,
 1005                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
 1006                     "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
 1007                     rap->rxa_start,
 1008                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
 1009                     rap->rxa_qframes, rxseq, tid,
 1010                     wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
 1011                 vap->iv_stats.is_ampdu_bar_oow++;
 1012                 IEEE80211_NODE_STAT(ni, rx_drop);
 1013         }
 1014 }
 1015 
 1016 /*
 1017  * Setup HT-specific state in a node.  Called only
 1018  * when HT use is negotiated so we don't do extra
 1019  * work for temporary and/or legacy sta's.
 1020  */
 1021 void
 1022 ieee80211_ht_node_init(struct ieee80211_node *ni)
 1023 {
 1024         struct ieee80211_tx_ampdu *tap;
 1025         int ac;
 1026 
 1027         if (ni->ni_flags & IEEE80211_NODE_HT) {
 1028                 /*
 1029                  * Clean AMPDU state on re-associate.  This handles the case
 1030                  * where a station leaves w/o notifying us and then returns
 1031                  * before node is reaped for inactivity.
 1032                  */
 1033                 ieee80211_ht_node_cleanup(ni);
 1034         }
 1035         for (ac = 0; ac < WME_NUM_AC; ac++) {
 1036                 tap = &ni->ni_tx_ampdu[ac];
 1037                 tap->txa_ac = ac;
 1038                 tap->txa_ni = ni;
 1039                 /* NB: further initialization deferred */
 1040         }
 1041         ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
 1042 }
 1043 
 1044 /*
 1045  * Cleanup HT-specific state in a node.  Called only
 1046  * when HT use has been marked.
 1047  */
 1048 void
 1049 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
 1050 {
 1051         struct ieee80211com *ic = ni->ni_ic;
 1052         int i;
 1053 
 1054         KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
 1055 
 1056         /* XXX optimize this */
 1057         for (i = 0; i < WME_NUM_AC; i++) {
 1058                 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
 1059                 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
 1060                         ampdu_tx_stop(tap);
 1061         }
 1062         for (i = 0; i < WME_NUM_TID; i++)
 1063                 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
 1064 
 1065         ni->ni_htcap = 0;
 1066         ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
 1067 }
 1068 
 1069 /*
 1070  * Age out HT resources for a station.
 1071  */
 1072 void
 1073 ieee80211_ht_node_age(struct ieee80211_node *ni)
 1074 {
 1075 #ifdef IEEE80211_AMPDU_AGE
 1076         struct ieee80211vap *vap = ni->ni_vap;
 1077         uint8_t tid;
 1078 #endif
 1079 
 1080         KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
 1081 
 1082 #ifdef IEEE80211_AMPDU_AGE
 1083         for (tid = 0; tid < WME_NUM_TID; tid++) {
 1084                 struct ieee80211_rx_ampdu *rap;
 1085 
 1086                 rap = &ni->ni_rx_ampdu[tid];
 1087                 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
 1088                         continue;
 1089                 if (rap->rxa_qframes == 0)
 1090                         continue;
 1091                 /* 
 1092                  * Check for frames sitting too long in the reorder queue.
 1093                  * See above for more details on what's happening here.
 1094                  */
 1095                 /* XXX honor batimeout? */
 1096                 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
 1097                         /*
 1098                          * Too long since we received the first
 1099                          * frame; flush the reorder buffer.
 1100                          */
 1101                         vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
 1102                         ampdu_rx_flush(ni, rap);
 1103                 }
 1104         }
 1105 #endif /* IEEE80211_AMPDU_AGE */
 1106 }
 1107 
 1108 static struct ieee80211_channel *
 1109 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
 1110 {
 1111         return ieee80211_find_channel(ic, c->ic_freq,
 1112             (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
 1113 }
 1114 
 1115 /*
 1116  * Adjust a channel to be HT/non-HT according to the vap's configuration.
 1117  */
 1118 struct ieee80211_channel *
 1119 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
 1120         struct ieee80211_channel *chan, int flags)
 1121 {
 1122         struct ieee80211_channel *c;
 1123 
 1124         if (flags & IEEE80211_FHT_HT) {
 1125                 /* promote to HT if possible */
 1126                 if (flags & IEEE80211_FHT_USEHT40) {
 1127                         if (!IEEE80211_IS_CHAN_HT40(chan)) {
 1128                                 /* NB: arbitrarily pick ht40+ over ht40- */
 1129                                 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
 1130                                 if (c == NULL)
 1131                                         c = findhtchan(ic, chan,
 1132                                                 IEEE80211_CHAN_HT40D);
 1133                                 if (c == NULL)
 1134                                         c = findhtchan(ic, chan,
 1135                                                 IEEE80211_CHAN_HT20);
 1136                                 if (c != NULL)
 1137                                         chan = c;
 1138                         }
 1139                 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
 1140                         c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
 1141                         if (c != NULL)
 1142                                 chan = c;
 1143                 }
 1144         } else if (IEEE80211_IS_CHAN_HT(chan)) {
 1145                 /* demote to legacy, HT use is disabled */
 1146                 c = ieee80211_find_channel(ic, chan->ic_freq,
 1147                     chan->ic_flags &~ IEEE80211_CHAN_HT);
 1148                 if (c != NULL)
 1149                         chan = c;
 1150         }
 1151         return chan;
 1152 }
 1153 
 1154 /*
 1155  * Setup HT-specific state for a legacy WDS peer.
 1156  */
 1157 void
 1158 ieee80211_ht_wds_init(struct ieee80211_node *ni)
 1159 {
 1160         struct ieee80211vap *vap = ni->ni_vap;
 1161         struct ieee80211_tx_ampdu *tap;
 1162         int ac;
 1163 
 1164         KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
 1165 
 1166         /* XXX check scan cache in case peer has an ap and we have info */
 1167         /*
 1168          * If setup with a legacy channel; locate an HT channel.
 1169          * Otherwise if the inherited channel (from a companion
 1170          * AP) is suitable use it so we use the same location
 1171          * for the extension channel).
 1172          */
 1173         ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
 1174             ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
 1175 
 1176         ni->ni_htcap = 0;
 1177         if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
 1178                 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
 1179         if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
 1180                 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
 1181                 ni->ni_chw = 40;
 1182                 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
 1183                         ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
 1184                 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
 1185                         ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
 1186                 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
 1187                         ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
 1188         } else {
 1189                 ni->ni_chw = 20;
 1190                 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
 1191         }
 1192         ni->ni_htctlchan = ni->ni_chan->ic_ieee;
 1193         if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
 1194                 ni->ni_flags |= IEEE80211_NODE_RIFS;
 1195         /* XXX does it make sense to enable SMPS? */
 1196 
 1197         ni->ni_htopmode = 0;            /* XXX need protection state */
 1198         ni->ni_htstbc = 0;              /* XXX need info */
 1199 
 1200         for (ac = 0; ac < WME_NUM_AC; ac++) {
 1201                 tap = &ni->ni_tx_ampdu[ac];
 1202                 tap->txa_ac = ac;
 1203         }
 1204         /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
 1205         ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
 1206 }
 1207 
 1208 /*
 1209  * Notify hostap vaps of a change in the HTINFO ie.
 1210  */
 1211 static void
 1212 htinfo_notify(struct ieee80211com *ic)
 1213 {
 1214         struct ieee80211vap *vap;
 1215         int first = 1;
 1216 
 1217         IEEE80211_LOCK_ASSERT(ic);
 1218 
 1219         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
 1220                 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
 1221                         continue;
 1222                 if (vap->iv_state != IEEE80211_S_RUN ||
 1223                     !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
 1224                         continue;
 1225                 if (first) {
 1226                         IEEE80211_NOTE(vap,
 1227                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
 1228                             vap->iv_bss,
 1229                             "HT bss occupancy change: %d sta, %d ht, "
 1230                             "%d ht40%s, HT protmode now 0x%x"
 1231                             , ic->ic_sta_assoc
 1232                             , ic->ic_ht_sta_assoc
 1233                             , ic->ic_ht40_sta_assoc
 1234                             , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ?
 1235                                  ", non-HT sta present" : ""
 1236                             , ic->ic_curhtprotmode);
 1237                         first = 0;
 1238                 }
 1239                 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
 1240         }
 1241 }
 1242 
 1243 /*
 1244  * Calculate HT protection mode from current
 1245  * state and handle updates.
 1246  */
 1247 static void
 1248 htinfo_update(struct ieee80211com *ic)
 1249 {
 1250         uint8_t protmode;
 1251 
 1252         if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
 1253                 protmode = IEEE80211_HTINFO_OPMODE_MIXED
 1254                          | IEEE80211_HTINFO_NONHT_PRESENT;
 1255         } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) {
 1256                 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
 1257                          | IEEE80211_HTINFO_NONHT_PRESENT;
 1258         } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
 1259             IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 
 1260             ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
 1261                 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
 1262         } else {
 1263                 protmode = IEEE80211_HTINFO_OPMODE_PURE;
 1264         }
 1265         if (protmode != ic->ic_curhtprotmode) {
 1266                 ic->ic_curhtprotmode = protmode;
 1267                 htinfo_notify(ic);
 1268         }
 1269 }
 1270 
 1271 /*
 1272  * Handle an HT station joining a BSS.
 1273  */
 1274 void
 1275 ieee80211_ht_node_join(struct ieee80211_node *ni)
 1276 {
 1277         struct ieee80211com *ic = ni->ni_ic;
 1278 
 1279         IEEE80211_LOCK_ASSERT(ic);
 1280 
 1281         if (ni->ni_flags & IEEE80211_NODE_HT) {
 1282                 ic->ic_ht_sta_assoc++;
 1283                 if (ni->ni_chw == 40)
 1284                         ic->ic_ht40_sta_assoc++;
 1285         }
 1286         htinfo_update(ic);
 1287 }
 1288 
 1289 /*
 1290  * Handle an HT station leaving a BSS.
 1291  */
 1292 void
 1293 ieee80211_ht_node_leave(struct ieee80211_node *ni)
 1294 {
 1295         struct ieee80211com *ic = ni->ni_ic;
 1296 
 1297         IEEE80211_LOCK_ASSERT(ic);
 1298 
 1299         if (ni->ni_flags & IEEE80211_NODE_HT) {
 1300                 ic->ic_ht_sta_assoc--;
 1301                 if (ni->ni_chw == 40)
 1302                         ic->ic_ht40_sta_assoc--;
 1303         }
 1304         htinfo_update(ic);
 1305 }
 1306 
 1307 /*
 1308  * Public version of htinfo_update; used for processing
 1309  * beacon frames from overlapping bss.
 1310  *
 1311  * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
 1312  * (on receipt of a beacon that advertises MIXED) or
 1313  * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
 1314  * from an overlapping legacy bss).  We treat MIXED with
 1315  * a higher precedence than PROTOPT (i.e. we will not change
 1316  * change PROTOPT -> MIXED; only MIXED -> PROTOPT).  This
 1317  * corresponds to how we handle things in htinfo_update.
 1318  */
 1319 void
 1320 ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
 1321 {
 1322 #define OPMODE(x)       SM(x, IEEE80211_HTINFO_OPMODE)
 1323         IEEE80211_LOCK(ic);
 1324 
 1325         /* track non-HT station presence */
 1326         KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
 1327             ("protmode 0x%x", protmode));
 1328         ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
 1329         ic->ic_lastnonht = ticks;
 1330 
 1331         if (protmode != ic->ic_curhtprotmode &&
 1332             (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
 1333              OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
 1334                 /* push beacon update */
 1335                 ic->ic_curhtprotmode = protmode;
 1336                 htinfo_notify(ic);
 1337         }
 1338         IEEE80211_UNLOCK(ic);
 1339 #undef OPMODE
 1340 }
 1341 
 1342 /*
 1343  * Time out presence of an overlapping bss with non-HT
 1344  * stations.  When operating in hostap mode we listen for
 1345  * beacons from other stations and if we identify a non-HT
 1346  * station is present we update the opmode field of the
 1347  * HTINFO ie.  To identify when all non-HT stations are
 1348  * gone we time out this condition.
 1349  */
 1350 void
 1351 ieee80211_ht_timeout(struct ieee80211com *ic)
 1352 {
 1353         IEEE80211_LOCK_ASSERT(ic);
 1354 
 1355         if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) &&
 1356             time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
 1357 #if 0
 1358                 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
 1359                     "%s", "time out non-HT STA present on channel");
 1360 #endif
 1361                 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
 1362                 htinfo_update(ic);
 1363         }
 1364 }
 1365 
 1366 /* unalligned little endian access */     
 1367 #define LE_READ_2(p)                                    \
 1368         ((uint16_t)                                     \
 1369          ((((const uint8_t *)(p))[0]      ) |           \
 1370           (((const uint8_t *)(p))[1] <<  8)))
 1371 
 1372 /*
 1373  * Process an 802.11n HT capabilities ie.
 1374  */
 1375 void
 1376 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
 1377 {
 1378         if (ie[0] == IEEE80211_ELEMID_VENDOR) {
 1379                 /*
 1380                  * Station used Vendor OUI ie to associate;
 1381                  * mark the node so when we respond we'll use
 1382                  * the Vendor OUI's and not the standard ie's.
 1383                  */
 1384                 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
 1385                 ie += 4;
 1386         } else
 1387                 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
 1388 
 1389         ni->ni_htcap = LE_READ_2(ie +
 1390                 __offsetof(struct ieee80211_ie_htcap, hc_cap));
 1391         ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
 1392 }
 1393 
 1394 static void
 1395 htinfo_parse(struct ieee80211_node *ni,
 1396         const struct ieee80211_ie_htinfo *htinfo)
 1397 {
 1398         uint16_t w;
 1399 
 1400         ni->ni_htctlchan = htinfo->hi_ctrlchannel;
 1401         ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
 1402         w = LE_READ_2(&htinfo->hi_byte2);
 1403         ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
 1404         w = LE_READ_2(&htinfo->hi_byte45);
 1405         ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
 1406 }
 1407 
 1408 /*
 1409  * Parse an 802.11n HT info ie and save useful information
 1410  * to the node state.  Note this does not effect any state
 1411  * changes such as for channel width change.
 1412  */
 1413 void
 1414 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
 1415 {
 1416         if (ie[0] == IEEE80211_ELEMID_VENDOR)
 1417                 ie += 4;
 1418         htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
 1419 }
 1420 
 1421 /*
 1422  * Handle 11n channel switch.  Use the received HT ie's to
 1423  * identify the right channel to use.  If we cannot locate it
 1424  * in the channel table then fallback to legacy operation.
 1425  * Note that we use this information to identify the node's
 1426  * channel only; the caller is responsible for insuring any
 1427  * required channel change is done (e.g. in sta mode when
 1428  * parsing the contents of a beacon frame).
 1429  */
 1430 static void
 1431 htinfo_update_chw(struct ieee80211_node *ni, int htflags)
 1432 {
 1433         struct ieee80211com *ic = ni->ni_ic;
 1434         struct ieee80211_channel *c;
 1435         int chanflags;
 1436 
 1437         chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
 1438         if (chanflags != ni->ni_chan->ic_flags) {
 1439                 /* XXX not right for ht40- */
 1440                 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
 1441                 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
 1442                         /*
 1443                          * No HT40 channel entry in our table; fall back
 1444                          * to HT20 operation.  This should not happen.
 1445                          */
 1446                         c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
 1447 #if 0
 1448                         IEEE80211_NOTE(ni->ni_vap,
 1449                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
 1450                             "no HT40 channel (freq %u), falling back to HT20",
 1451                             ni->ni_chan->ic_freq);
 1452 #endif
 1453                         /* XXX stat */
 1454                 }
 1455                 if (c != NULL && c != ni->ni_chan) {
 1456                         IEEE80211_NOTE(ni->ni_vap,
 1457                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
 1458                             "switch station to HT%d channel %u/0x%x",
 1459                             IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
 1460                             c->ic_freq, c->ic_flags);
 1461                         ni->ni_chan = c;
 1462                 }
 1463                 /* NB: caller responsible for forcing any channel change */
 1464         }
 1465         /* update node's tx channel width */
 1466         ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
 1467 }
 1468 
 1469 /*
 1470  * Update 11n MIMO PS state according to received htcap.
 1471  */
 1472 static __inline int
 1473 htcap_update_mimo_ps(struct ieee80211_node *ni)
 1474 {
 1475         uint16_t oflags = ni->ni_flags;
 1476 
 1477         switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
 1478         case IEEE80211_HTCAP_SMPS_DYNAMIC:
 1479                 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
 1480                 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
 1481                 break;
 1482         case IEEE80211_HTCAP_SMPS_ENA:
 1483                 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
 1484                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
 1485                 break;
 1486         case IEEE80211_HTCAP_SMPS_OFF:
 1487         default:                /* disable on rx of reserved value */
 1488                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
 1489                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
 1490                 break;
 1491         }
 1492         return (oflags ^ ni->ni_flags);
 1493 }
 1494 
 1495 /*
 1496  * Update short GI state according to received htcap
 1497  * and local settings.
 1498  */
 1499 static __inline void
 1500 htcap_update_shortgi(struct ieee80211_node *ni)
 1501 {
 1502         struct ieee80211vap *vap = ni->ni_vap;
 1503 
 1504         ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
 1505         if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
 1506             (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
 1507                 ni->ni_flags |= IEEE80211_NODE_SGI20;
 1508         if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
 1509             (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
 1510                 ni->ni_flags |= IEEE80211_NODE_SGI40;
 1511 }
 1512 
 1513 /*
 1514  * Parse and update HT-related state extracted from
 1515  * the HT cap and info ie's.
 1516  */
 1517 void
 1518 ieee80211_ht_updateparams(struct ieee80211_node *ni,
 1519         const uint8_t *htcapie, const uint8_t *htinfoie)
 1520 {
 1521         struct ieee80211vap *vap = ni->ni_vap;
 1522         const struct ieee80211_ie_htinfo *htinfo;
 1523         int htflags;
 1524 
 1525         ieee80211_parse_htcap(ni, htcapie);
 1526         if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
 1527                 htcap_update_mimo_ps(ni);
 1528         htcap_update_shortgi(ni);
 1529 
 1530         if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
 1531                 htinfoie += 4;
 1532         htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
 1533         htinfo_parse(ni, htinfo);
 1534 
 1535         htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
 1536             IEEE80211_CHAN_HT20 : 0;
 1537         /* NB: honor operating mode constraint */
 1538         if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
 1539             (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
 1540                 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
 1541                         htflags = IEEE80211_CHAN_HT40U;
 1542                 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
 1543                         htflags = IEEE80211_CHAN_HT40D;
 1544         }
 1545         htinfo_update_chw(ni, htflags);
 1546 
 1547         if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
 1548             (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
 1549                 ni->ni_flags |= IEEE80211_NODE_RIFS;
 1550         else
 1551                 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
 1552 }
 1553 
 1554 /*
 1555  * Parse and update HT-related state extracted from the HT cap ie
 1556  * for a station joining an HT BSS.
 1557  */
 1558 void
 1559 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
 1560 {
 1561         struct ieee80211vap *vap = ni->ni_vap;
 1562         int htflags;
 1563 
 1564         ieee80211_parse_htcap(ni, htcapie);
 1565         if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
 1566                 htcap_update_mimo_ps(ni);
 1567         htcap_update_shortgi(ni);
 1568 
 1569         /* NB: honor operating mode constraint */
 1570         /* XXX 40 MHz intolerant */
 1571         htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
 1572             IEEE80211_CHAN_HT20 : 0;
 1573         if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
 1574             (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
 1575                 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
 1576                         htflags = IEEE80211_CHAN_HT40U;
 1577                 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
 1578                         htflags = IEEE80211_CHAN_HT40D;
 1579         }
 1580         htinfo_update_chw(ni, htflags);
 1581 }
 1582 
 1583 /*
 1584  * Install received HT rate set by parsing the HT cap ie.
 1585  */
 1586 int
 1587 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
 1588 {
 1589         struct ieee80211com *ic = ni->ni_ic;
 1590         struct ieee80211vap *vap = ni->ni_vap;
 1591         const struct ieee80211_ie_htcap *htcap;
 1592         struct ieee80211_htrateset *rs;
 1593         int i, maxequalmcs, maxunequalmcs;
 1594 
 1595         maxequalmcs = ic->ic_txstream * 8 - 1;
 1596         if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
 1597                 if (ic->ic_txstream >= 2)
 1598                         maxunequalmcs = 38;
 1599                 if (ic->ic_txstream >= 3)
 1600                         maxunequalmcs = 52;
 1601                 if (ic->ic_txstream >= 4)
 1602                         maxunequalmcs = 76;
 1603         } else
 1604                 maxunequalmcs = 0;
 1605 
 1606         rs = &ni->ni_htrates;
 1607         memset(rs, 0, sizeof(*rs));
 1608         if (ie != NULL) {
 1609                 if (ie[0] == IEEE80211_ELEMID_VENDOR)
 1610                         ie += 4;
 1611                 htcap = (const struct ieee80211_ie_htcap *) ie;
 1612                 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
 1613                         if (isclr(htcap->hc_mcsset, i))
 1614                                 continue;
 1615                         if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
 1616                                 IEEE80211_NOTE(vap,
 1617                                     IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
 1618                                     "WARNING, HT rate set too large; only "
 1619                                     "using %u rates", IEEE80211_HTRATE_MAXSIZE);
 1620                                 vap->iv_stats.is_rx_rstoobig++;
 1621                                 break;
 1622                         }
 1623                         if (i <= 31 && i > maxequalmcs)
 1624                                 continue;
 1625                         if (i == 32 &&
 1626                             (ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0)
 1627                                 continue;
 1628                         if (i > 32 && i > maxunequalmcs)
 1629                                 continue;
 1630                         rs->rs_rates[rs->rs_nrates++] = i;
 1631                 }
 1632         }
 1633         return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
 1634 }
 1635 
 1636 /*
 1637  * Mark rates in a node's HT rate set as basic according
 1638  * to the information in the supplied HT info ie.
 1639  */
 1640 void
 1641 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
 1642 {
 1643         const struct ieee80211_ie_htinfo *htinfo;
 1644         struct ieee80211_htrateset *rs;
 1645         int i, j;
 1646 
 1647         if (ie[0] == IEEE80211_ELEMID_VENDOR)
 1648                 ie += 4;
 1649         htinfo = (const struct ieee80211_ie_htinfo *) ie;
 1650         rs = &ni->ni_htrates;
 1651         if (rs->rs_nrates == 0) {
 1652                 IEEE80211_NOTE(ni->ni_vap,
 1653                     IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
 1654                     "%s", "WARNING, empty HT rate set");
 1655                 return;
 1656         }
 1657         for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
 1658                 if (isclr(htinfo->hi_basicmcsset, i))
 1659                         continue;
 1660                 for (j = 0; j < rs->rs_nrates; j++)
 1661                         if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
 1662                                 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
 1663         }
 1664 }
 1665 
 1666 static void
 1667 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
 1668 {
 1669         callout_init(&tap->txa_timer, CALLOUT_MPSAFE);
 1670         tap->txa_flags |= IEEE80211_AGGR_SETUP;
 1671 }
 1672 
 1673 static void
 1674 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
 1675 {
 1676         struct ieee80211_node *ni = tap->txa_ni;
 1677         struct ieee80211com *ic = ni->ni_ic;
 1678 
 1679         KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
 1680             ("txa_flags 0x%x ac %d", tap->txa_flags, tap->txa_ac));
 1681 
 1682         /*
 1683          * Stop BA stream if setup so driver has a chance
 1684          * to reclaim any resources it might have allocated.
 1685          */
 1686         ic->ic_addba_stop(ni, tap);
 1687         /*
 1688          * Stop any pending BAR transmit.
 1689          */
 1690         bar_stop_timer(tap);
 1691 
 1692         tap->txa_lastsample = 0;
 1693         tap->txa_avgpps = 0;
 1694         /* NB: clearing NAK means we may re-send ADDBA */ 
 1695         tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
 1696 }
 1697 
 1698 /*
 1699  * ADDBA response timeout.
 1700  *
 1701  * If software aggregation and per-TID queue management was done here,
 1702  * that queue would be unpaused after the ADDBA timeout occurs.
 1703  */
 1704 static void
 1705 addba_timeout(void *arg)
 1706 {
 1707         struct ieee80211_tx_ampdu *tap = arg;
 1708         struct ieee80211_node *ni = tap->txa_ni;
 1709         struct ieee80211com *ic = ni->ni_ic;
 1710 
 1711         /* XXX ? */
 1712         tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
 1713         tap->txa_attempts++;
 1714         ic->ic_addba_response_timeout(ni, tap);
 1715 }
 1716 
 1717 static void
 1718 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
 1719 {
 1720         /* XXX use CALLOUT_PENDING instead? */
 1721         callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
 1722             addba_timeout, tap);
 1723         tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
 1724         tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
 1725 }
 1726 
 1727 static void
 1728 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
 1729 {
 1730         /* XXX use CALLOUT_PENDING instead? */
 1731         if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
 1732                 callout_stop(&tap->txa_timer);
 1733                 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
 1734         }
 1735 }
 1736 
 1737 static void
 1738 null_addba_response_timeout(struct ieee80211_node *ni,
 1739     struct ieee80211_tx_ampdu *tap)
 1740 {
 1741 }
 1742 
 1743 /*
 1744  * Default method for requesting A-MPDU tx aggregation.
 1745  * We setup the specified state block and start a timer
 1746  * to wait for an ADDBA response frame.
 1747  */
 1748 static int
 1749 ieee80211_addba_request(struct ieee80211_node *ni,
 1750         struct ieee80211_tx_ampdu *tap,
 1751         int dialogtoken, int baparamset, int batimeout)
 1752 {
 1753         int bufsiz;
 1754 
 1755         /* XXX locking */
 1756         tap->txa_token = dialogtoken;
 1757         tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
 1758         bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
 1759         tap->txa_wnd = (bufsiz == 0) ?
 1760             IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
 1761         addba_start_timeout(tap);
 1762         return 1;
 1763 }
 1764 
 1765 /*
 1766  * Default method for processing an A-MPDU tx aggregation
 1767  * response.  We shutdown any pending timer and update the
 1768  * state block according to the reply.
 1769  */
 1770 static int
 1771 ieee80211_addba_response(struct ieee80211_node *ni,
 1772         struct ieee80211_tx_ampdu *tap,
 1773         int status, int baparamset, int batimeout)
 1774 {
 1775         int bufsiz, tid;
 1776 
 1777         /* XXX locking */
 1778         addba_stop_timeout(tap);
 1779         if (status == IEEE80211_STATUS_SUCCESS) {
 1780                 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
 1781                 /* XXX override our request? */
 1782                 tap->txa_wnd = (bufsiz == 0) ?
 1783                     IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
 1784                 /* XXX AC/TID */
 1785                 tid = MS(baparamset, IEEE80211_BAPS_TID);
 1786                 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
 1787                 tap->txa_attempts = 0;
 1788         } else {
 1789                 /* mark tid so we don't try again */
 1790                 tap->txa_flags |= IEEE80211_AGGR_NAK;
 1791         }
 1792         return 1;
 1793 }
 1794 
 1795 /*
 1796  * Default method for stopping A-MPDU tx aggregation.
 1797  * Any timer is cleared and we drain any pending frames.
 1798  */
 1799 static void
 1800 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
 1801 {
 1802         /* XXX locking */
 1803         addba_stop_timeout(tap);
 1804         if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
 1805                 /* XXX clear aggregation queue */
 1806                 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
 1807         }
 1808         tap->txa_attempts = 0;
 1809 }
 1810 
 1811 /*
 1812  * Process a received action frame using the default aggregation
 1813  * policy.  We intercept ADDBA-related frames and use them to
 1814  * update our aggregation state.  All other frames are passed up
 1815  * for processing by ieee80211_recv_action.
 1816  */
 1817 static int
 1818 ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
 1819         const struct ieee80211_frame *wh,
 1820         const uint8_t *frm, const uint8_t *efrm)
 1821 {
 1822         struct ieee80211com *ic = ni->ni_ic;
 1823         struct ieee80211vap *vap = ni->ni_vap;
 1824         struct ieee80211_rx_ampdu *rap;
 1825         uint8_t dialogtoken;
 1826         uint16_t baparamset, batimeout, baseqctl;
 1827         uint16_t args[5];
 1828         int tid;
 1829 
 1830         dialogtoken = frm[2];
 1831         baparamset = LE_READ_2(frm+3);
 1832         batimeout = LE_READ_2(frm+5);
 1833         baseqctl = LE_READ_2(frm+7);
 1834 
 1835         tid = MS(baparamset, IEEE80211_BAPS_TID);
 1836 
 1837         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 1838             "recv ADDBA request: dialogtoken %u baparamset 0x%x "
 1839             "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d",
 1840             dialogtoken, baparamset,
 1841             tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ),
 1842             batimeout,
 1843             MS(baseqctl, IEEE80211_BASEQ_START),
 1844             MS(baseqctl, IEEE80211_BASEQ_FRAG));
 1845 
 1846         rap = &ni->ni_rx_ampdu[tid];
 1847 
 1848         /* Send ADDBA response */
 1849         args[0] = dialogtoken;
 1850         /*
 1851          * NB: We ack only if the sta associated with HT and
 1852          * the ap is configured to do AMPDU rx (the latter
 1853          * violates the 11n spec and is mostly for testing).
 1854          */
 1855         if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
 1856             (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
 1857                 /* XXX handle ampdu_rx_start failure */
 1858                 ic->ic_ampdu_rx_start(ni, rap,
 1859                     baparamset, batimeout, baseqctl);
 1860 
 1861                 args[1] = IEEE80211_STATUS_SUCCESS;
 1862         } else {
 1863                 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1864                     ni, "reject ADDBA request: %s",
 1865                     ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
 1866                        "administratively disabled" :
 1867                        "not negotiated for station");
 1868                 vap->iv_stats.is_addba_reject++;
 1869                 args[1] = IEEE80211_STATUS_UNSPECIFIED;
 1870         }
 1871         /* XXX honor rap flags? */
 1872         args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
 1873                 | SM(tid, IEEE80211_BAPS_TID)
 1874                 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
 1875                 ;
 1876         args[3] = 0;
 1877         args[4] = 0;
 1878         ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
 1879                 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
 1880         return 0;
 1881 }
 1882 
 1883 static int
 1884 ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
 1885         const struct ieee80211_frame *wh,
 1886         const uint8_t *frm, const uint8_t *efrm)
 1887 {
 1888         struct ieee80211com *ic = ni->ni_ic;
 1889         struct ieee80211vap *vap = ni->ni_vap;
 1890         struct ieee80211_tx_ampdu *tap;
 1891         uint8_t dialogtoken, policy;
 1892         uint16_t baparamset, batimeout, code;
 1893         int tid, ac, bufsiz;
 1894 
 1895         dialogtoken = frm[2];
 1896         code = LE_READ_2(frm+3);
 1897         baparamset = LE_READ_2(frm+5);
 1898         tid = MS(baparamset, IEEE80211_BAPS_TID);
 1899         bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
 1900         policy = MS(baparamset, IEEE80211_BAPS_POLICY);
 1901         batimeout = LE_READ_2(frm+7);
 1902 
 1903         ac = TID_TO_WME_AC(tid);
 1904         tap = &ni->ni_tx_ampdu[ac];
 1905         if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
 1906                 IEEE80211_DISCARD_MAC(vap,
 1907                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1908                     ni->ni_macaddr, "ADDBA response",
 1909                     "no pending ADDBA, tid %d dialogtoken %u "
 1910                     "code %d", tid, dialogtoken, code);
 1911                 vap->iv_stats.is_addba_norequest++;
 1912                 return 0;
 1913         }
 1914         if (dialogtoken != tap->txa_token) {
 1915                 IEEE80211_DISCARD_MAC(vap,
 1916                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1917                     ni->ni_macaddr, "ADDBA response",
 1918                     "dialogtoken mismatch: waiting for %d, "
 1919                     "received %d, tid %d code %d",
 1920                     tap->txa_token, dialogtoken, tid, code);
 1921                 vap->iv_stats.is_addba_badtoken++;
 1922                 return 0;
 1923         }
 1924         /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
 1925         if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
 1926                 IEEE80211_DISCARD_MAC(vap,
 1927                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1928                     ni->ni_macaddr, "ADDBA response",
 1929                     "policy mismatch: expecting %s, "
 1930                     "received %s, tid %d code %d",
 1931                     tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
 1932                     policy, tid, code);
 1933                 vap->iv_stats.is_addba_badpolicy++;
 1934                 return 0;
 1935         }
 1936 #if 0
 1937         /* XXX we take MIN in ieee80211_addba_response */
 1938         if (bufsiz > IEEE80211_AGGR_BAWMAX) {
 1939                 IEEE80211_DISCARD_MAC(vap,
 1940                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1941                     ni->ni_macaddr, "ADDBA response",
 1942                     "BA window too large: max %d, "
 1943                     "received %d, tid %d code %d",
 1944                     bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
 1945                 vap->iv_stats.is_addba_badbawinsize++;
 1946                 return 0;
 1947         }
 1948 #endif
 1949         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 1950             "recv ADDBA response: dialogtoken %u code %d "
 1951             "baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
 1952             dialogtoken, code, baparamset, tid, bufsiz,
 1953             batimeout);
 1954         ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
 1955         return 0;
 1956 }
 1957 
 1958 static int
 1959 ht_recv_action_ba_delba(struct ieee80211_node *ni,
 1960         const struct ieee80211_frame *wh,
 1961         const uint8_t *frm, const uint8_t *efrm)
 1962 {
 1963         struct ieee80211com *ic = ni->ni_ic;
 1964         struct ieee80211_rx_ampdu *rap;
 1965         struct ieee80211_tx_ampdu *tap;
 1966         uint16_t baparamset, code;
 1967         int tid, ac;
 1968 
 1969         baparamset = LE_READ_2(frm+2);
 1970         code = LE_READ_2(frm+4);
 1971 
 1972         tid = MS(baparamset, IEEE80211_DELBAPS_TID);
 1973 
 1974         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 1975             "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
 1976             "code %d", baparamset, tid,
 1977             MS(baparamset, IEEE80211_DELBAPS_INIT), code);
 1978 
 1979         if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
 1980                 ac = TID_TO_WME_AC(tid);
 1981                 tap = &ni->ni_tx_ampdu[ac];
 1982                 ic->ic_addba_stop(ni, tap);
 1983         } else {
 1984                 rap = &ni->ni_rx_ampdu[tid];
 1985                 ic->ic_ampdu_rx_stop(ni, rap);
 1986         }
 1987         return 0;
 1988 }
 1989 
 1990 static int
 1991 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
 1992         const struct ieee80211_frame *wh,
 1993         const uint8_t *frm, const uint8_t *efrm)
 1994 {
 1995         int chw;
 1996 
 1997         chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20;
 1998 
 1999         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2000             "%s: HT txchwidth, width %d%s",
 2001             __func__, chw, ni->ni_chw != chw ? "*" : "");
 2002         if (chw != ni->ni_chw) {
 2003                 ni->ni_chw = chw;
 2004                 /* XXX notify on change */
 2005         }
 2006         return 0;
 2007 }
 2008 
 2009 static int
 2010 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
 2011         const struct ieee80211_frame *wh,
 2012         const uint8_t *frm, const uint8_t *efrm)
 2013 {
 2014         const struct ieee80211_action_ht_mimopowersave *mps =
 2015             (const struct ieee80211_action_ht_mimopowersave *) frm;
 2016 
 2017         /* XXX check iv_htcaps */
 2018         if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
 2019                 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
 2020         else
 2021                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
 2022         if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
 2023                 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
 2024         else
 2025                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
 2026         /* XXX notify on change */
 2027         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2028             "%s: HT MIMO PS (%s%s)", __func__,
 2029             (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ?  "on" : "off",
 2030             (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ?  "+rts" : ""
 2031         );
 2032         return 0;
 2033 }
 2034 
 2035 /*
 2036  * Transmit processing.
 2037  */
 2038 
 2039 /*
 2040  * Check if A-MPDU should be requested/enabled for a stream.
 2041  * We require a traffic rate above a per-AC threshold and we
 2042  * also handle backoff from previous failed attempts.
 2043  *
 2044  * Drivers may override this method to bring in information
 2045  * such as link state conditions in making the decision.
 2046  */
 2047 static int
 2048 ieee80211_ampdu_enable(struct ieee80211_node *ni,
 2049         struct ieee80211_tx_ampdu *tap)
 2050 {
 2051         struct ieee80211vap *vap = ni->ni_vap;
 2052 
 2053         if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac])
 2054                 return 0;
 2055         /* XXX check rssi? */
 2056         if (tap->txa_attempts >= ieee80211_addba_maxtries &&
 2057             ticks < tap->txa_nextrequest) {
 2058                 /*
 2059                  * Don't retry too often; txa_nextrequest is set
 2060                  * to the minimum interval we'll retry after
 2061                  * ieee80211_addba_maxtries failed attempts are made.
 2062                  */
 2063                 return 0;
 2064         }
 2065         IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
 2066             "enable AMPDU on %s, avgpps %d pkts %d",
 2067             ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts);
 2068         return 1;
 2069 }
 2070 
 2071 /*
 2072  * Request A-MPDU tx aggregation.  Setup local state and
 2073  * issue an ADDBA request.  BA use will only happen after
 2074  * the other end replies with ADDBA response.
 2075  */
 2076 int
 2077 ieee80211_ampdu_request(struct ieee80211_node *ni,
 2078         struct ieee80211_tx_ampdu *tap)
 2079 {
 2080         struct ieee80211com *ic = ni->ni_ic;
 2081         uint16_t args[5];
 2082         int tid, dialogtoken;
 2083         static int tokens = 0;  /* XXX */
 2084 
 2085         /* XXX locking */
 2086         if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
 2087                 /* do deferred setup of state */
 2088                 ampdu_tx_setup(tap);
 2089         }
 2090         /* XXX hack for not doing proper locking */
 2091         tap->txa_flags &= ~IEEE80211_AGGR_NAK;
 2092 
 2093         dialogtoken = (tokens+1) % 63;          /* XXX */
 2094         tid = WME_AC_TO_TID(tap->txa_ac);
 2095         tap->txa_start = ni->ni_txseqs[tid];
 2096 
 2097         args[0] = dialogtoken;
 2098         args[1] = 0;    /* NB: status code not used */
 2099         args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
 2100                 | SM(tid, IEEE80211_BAPS_TID)
 2101                 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
 2102                 ;
 2103         args[3] = 0;    /* batimeout */
 2104         /* NB: do first so there's no race against reply */
 2105         if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) {
 2106                 /* unable to setup state, don't make request */
 2107                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2108                     ni, "%s: could not setup BA stream for AC %d",
 2109                     __func__, tap->txa_ac);
 2110                 /* defer next try so we don't slam the driver with requests */
 2111                 tap->txa_attempts = ieee80211_addba_maxtries;
 2112                 /* NB: check in case driver wants to override */
 2113                 if (tap->txa_nextrequest <= ticks)
 2114                         tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
 2115                 return 0;
 2116         }
 2117         tokens = dialogtoken;                   /* allocate token */
 2118         /* NB: after calling ic_addba_request so driver can set txa_start */
 2119         args[4] = SM(tap->txa_start, IEEE80211_BASEQ_START)
 2120                 | SM(0, IEEE80211_BASEQ_FRAG)
 2121                 ;
 2122         return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
 2123                 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
 2124 }
 2125 
 2126 /*
 2127  * Terminate an AMPDU tx stream.  State is reclaimed
 2128  * and the peer notified with a DelBA Action frame.
 2129  */
 2130 void
 2131 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
 2132         int reason)
 2133 {
 2134         struct ieee80211com *ic = ni->ni_ic;
 2135         struct ieee80211vap *vap = ni->ni_vap;
 2136         uint16_t args[4];
 2137 
 2138         /* XXX locking */
 2139         tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
 2140         if (IEEE80211_AMPDU_RUNNING(tap)) {
 2141                 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 2142                     ni, "%s: stop BA stream for AC %d (reason %d)",
 2143                     __func__, tap->txa_ac, reason);
 2144                 vap->iv_stats.is_ampdu_stop++;
 2145 
 2146                 ic->ic_addba_stop(ni, tap);
 2147                 args[0] = WME_AC_TO_TID(tap->txa_ac);
 2148                 args[1] = IEEE80211_DELBAPS_INIT;
 2149                 args[2] = reason;                       /* XXX reason code */
 2150                 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
 2151                         IEEE80211_ACTION_BA_DELBA, args);
 2152         } else {
 2153                 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 2154                     ni, "%s: BA stream for AC %d not running (reason %d)",
 2155                     __func__, tap->txa_ac, reason);
 2156                 vap->iv_stats.is_ampdu_stop_failed++;
 2157         }
 2158 }
 2159 
 2160 static void
 2161 bar_timeout(void *arg)
 2162 {
 2163         struct ieee80211_tx_ampdu *tap = arg;
 2164         struct ieee80211_node *ni = tap->txa_ni;
 2165 
 2166         KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
 2167             ("bar/addba collision, flags 0x%x", tap->txa_flags));
 2168 
 2169         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2170             ni, "%s: tid %u flags 0x%x attempts %d", __func__,
 2171             tap->txa_ac, tap->txa_flags, tap->txa_attempts);
 2172 
 2173         /* guard against race with bar_tx_complete */
 2174         if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
 2175                 return;
 2176         /* XXX ? */
 2177         if (tap->txa_attempts >= ieee80211_bar_maxtries)
 2178                 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
 2179         else
 2180                 ieee80211_send_bar(ni, tap, tap->txa_seqpending);
 2181 }
 2182 
 2183 static void
 2184 bar_start_timer(struct ieee80211_tx_ampdu *tap)
 2185 {
 2186         callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
 2187 }
 2188 
 2189 static void
 2190 bar_stop_timer(struct ieee80211_tx_ampdu *tap)
 2191 {
 2192         callout_stop(&tap->txa_timer);
 2193 }
 2194 
 2195 static void
 2196 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
 2197 {
 2198         struct ieee80211_tx_ampdu *tap = arg;
 2199 
 2200         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2201             ni, "%s: tid %u flags 0x%x pending %d status %d",
 2202             __func__, tap->txa_ac, tap->txa_flags,
 2203             callout_pending(&tap->txa_timer), status);
 2204 
 2205         /* XXX locking */
 2206         if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
 2207             callout_pending(&tap->txa_timer)) {
 2208                 struct ieee80211com *ic = ni->ni_ic;
 2209 
 2210                 if (status == 0)                /* ACK'd */
 2211                         bar_stop_timer(tap);
 2212                 ic->ic_bar_response(ni, tap, status);
 2213                 /* NB: just let timer expire so we pace requests */
 2214         }
 2215 }
 2216 
 2217 static void
 2218 ieee80211_bar_response(struct ieee80211_node *ni,
 2219         struct ieee80211_tx_ampdu *tap, int status)
 2220 {
 2221 
 2222         if (status == 0) {              /* got ACK */
 2223                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2224                     ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
 2225                     tap->txa_start,
 2226                     IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
 2227                     tap->txa_qframes, tap->txa_seqpending,
 2228                     WME_AC_TO_TID(tap->txa_ac));
 2229 
 2230                 /* NB: timer already stopped in bar_tx_complete */
 2231                 tap->txa_start = tap->txa_seqpending;
 2232                 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
 2233         }
 2234 }
 2235 
 2236 /*
 2237  * Transmit a BAR frame to the specified node.  The
 2238  * BAR contents are drawn from the supplied aggregation
 2239  * state associated with the node.
 2240  *
 2241  * NB: we only handle immediate ACK w/ compressed bitmap.
 2242  */
 2243 int
 2244 ieee80211_send_bar(struct ieee80211_node *ni,
 2245         struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
 2246 {
 2247 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
 2248         struct ieee80211vap *vap = ni->ni_vap;
 2249         struct ieee80211com *ic = ni->ni_ic;
 2250         struct ieee80211_frame_bar *bar;
 2251         struct mbuf *m;
 2252         uint16_t barctl, barseqctl;
 2253         uint8_t *frm;
 2254         int tid, ret;
 2255 
 2256         if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
 2257                 /* no ADDBA response, should not happen */
 2258                 /* XXX stat+msg */
 2259                 return EINVAL;
 2260         }
 2261         /* XXX locking */
 2262         bar_stop_timer(tap);
 2263 
 2264         ieee80211_ref_node(ni);
 2265 
 2266         m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
 2267         if (m == NULL)
 2268                 senderr(ENOMEM, is_tx_nobuf);
 2269 
 2270         if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
 2271                 m_freem(m);
 2272                 senderr(ENOMEM, is_tx_nobuf);   /* XXX */
 2273                 /* NOTREACHED */
 2274         }
 2275 
 2276         bar = mtod(m, struct ieee80211_frame_bar *);
 2277         bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
 2278                 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
 2279         bar->i_fc[1] = 0;
 2280         IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
 2281         IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
 2282 
 2283         tid = WME_AC_TO_TID(tap->txa_ac);
 2284         barctl  = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
 2285                         0 : IEEE80211_BAR_NOACK)
 2286                 | IEEE80211_BAR_COMP
 2287                 | SM(tid, IEEE80211_BAR_TID)
 2288                 ;
 2289         barseqctl = SM(seq, IEEE80211_BAR_SEQ_START);
 2290         /* NB: known to have proper alignment */
 2291         bar->i_ctl = htole16(barctl);
 2292         bar->i_seq = htole16(barseqctl);
 2293         m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
 2294 
 2295         M_WME_SETAC(m, WME_AC_VO);
 2296 
 2297         IEEE80211_NODE_STAT(ni, tx_mgmt);       /* XXX tx_ctl? */
 2298 
 2299         /* XXX locking */
 2300         /* init/bump attempts counter */
 2301         if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
 2302                 tap->txa_attempts = 1;
 2303         else
 2304                 tap->txa_attempts++;
 2305         tap->txa_seqpending = seq;
 2306         tap->txa_flags |= IEEE80211_AGGR_BARPEND;
 2307 
 2308         IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
 2309             ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
 2310             tid, barctl, seq, tap->txa_attempts);
 2311 
 2312         /*
 2313          * ic_raw_xmit will free the node reference
 2314          * regardless of queue/TX success or failure.
 2315          */
 2316         ret = ic->ic_raw_xmit(ni, m, NULL);
 2317         if (ret != 0) {
 2318                 /* xmit failed, clear state flag */
 2319                 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
 2320                 return ret;
 2321         }
 2322         /* XXX hack against tx complete happening before timer is started */
 2323         if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
 2324                 bar_start_timer(tap);
 2325         return 0;
 2326 bad:
 2327         ieee80211_free_node(ni);
 2328         return ret;
 2329 #undef senderr
 2330 }
 2331 
 2332 static int
 2333 ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
 2334 {
 2335         struct ieee80211_bpf_params params;
 2336 
 2337         memset(&params, 0, sizeof(params));
 2338         params.ibp_pri = WME_AC_VO;
 2339         params.ibp_rate0 = ni->ni_txparms->mgmtrate;
 2340         /* NB: we know all frames are unicast */
 2341         params.ibp_try0 = ni->ni_txparms->maxretry;
 2342         params.ibp_power = ni->ni_txpower;
 2343         return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
 2344              &params);
 2345 }
 2346 
 2347 #define ADDSHORT(frm, v) do {                   \
 2348         frm[0] = (v) & 0xff;                    \
 2349         frm[1] = (v) >> 8;                      \
 2350         frm += 2;                               \
 2351 } while (0)
 2352 
 2353 /*
 2354  * Send an action management frame.  The arguments are stuff
 2355  * into a frame without inspection; the caller is assumed to
 2356  * prepare them carefully (e.g. based on the aggregation state).
 2357  */
 2358 static int
 2359 ht_send_action_ba_addba(struct ieee80211_node *ni,
 2360         int category, int action, void *arg0)
 2361 {
 2362         struct ieee80211vap *vap = ni->ni_vap;
 2363         struct ieee80211com *ic = ni->ni_ic;
 2364         uint16_t *args = arg0;
 2365         struct mbuf *m;
 2366         uint8_t *frm;
 2367 
 2368         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2369             "send ADDBA %s: dialogtoken %d status %d "
 2370             "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
 2371             (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
 2372                 "request" : "response",
 2373             args[0], args[1], args[2], MS(args[2], IEEE80211_BAPS_TID),
 2374             args[3], args[4]);
 2375 
 2376         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2377             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2378             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2379         ieee80211_ref_node(ni);
 2380 
 2381         m = ieee80211_getmgtframe(&frm,
 2382             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2383             sizeof(uint16_t)    /* action+category */
 2384             /* XXX may action payload */
 2385             + sizeof(struct ieee80211_action_ba_addbaresponse)
 2386         );
 2387         if (m != NULL) {
 2388                 *frm++ = category;
 2389                 *frm++ = action;
 2390                 *frm++ = args[0];               /* dialog token */
 2391                 if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE)
 2392                         ADDSHORT(frm, args[1]); /* status code */
 2393                 ADDSHORT(frm, args[2]);         /* baparamset */
 2394                 ADDSHORT(frm, args[3]);         /* batimeout */
 2395                 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
 2396                         ADDSHORT(frm, args[4]); /* baseqctl */
 2397                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2398                 return ht_action_output(ni, m);
 2399         } else {
 2400                 vap->iv_stats.is_tx_nobuf++;
 2401                 ieee80211_free_node(ni);
 2402                 return ENOMEM;
 2403         }
 2404 }
 2405 
 2406 static int
 2407 ht_send_action_ba_delba(struct ieee80211_node *ni,
 2408         int category, int action, void *arg0)
 2409 {
 2410         struct ieee80211vap *vap = ni->ni_vap;
 2411         struct ieee80211com *ic = ni->ni_ic;
 2412         uint16_t *args = arg0;
 2413         struct mbuf *m;
 2414         uint16_t baparamset;
 2415         uint8_t *frm;
 2416 
 2417         baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
 2418                    | args[1]
 2419                    ;
 2420         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2421             "send DELBA action: tid %d, initiator %d reason %d",
 2422             args[0], args[1], args[2]);
 2423 
 2424         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2425             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2426             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2427         ieee80211_ref_node(ni);
 2428 
 2429         m = ieee80211_getmgtframe(&frm,
 2430             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2431             sizeof(uint16_t)    /* action+category */
 2432             /* XXX may action payload */
 2433             + sizeof(struct ieee80211_action_ba_addbaresponse)
 2434         );
 2435         if (m != NULL) {
 2436                 *frm++ = category;
 2437                 *frm++ = action;
 2438                 ADDSHORT(frm, baparamset);
 2439                 ADDSHORT(frm, args[2]);         /* reason code */
 2440                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2441                 return ht_action_output(ni, m);
 2442         } else {
 2443                 vap->iv_stats.is_tx_nobuf++;
 2444                 ieee80211_free_node(ni);
 2445                 return ENOMEM;
 2446         }
 2447 }
 2448 
 2449 static int
 2450 ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
 2451         int category, int action, void *arg0)
 2452 {
 2453         struct ieee80211vap *vap = ni->ni_vap;
 2454         struct ieee80211com *ic = ni->ni_ic;
 2455         struct mbuf *m;
 2456         uint8_t *frm;
 2457 
 2458         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2459             "send HT txchwidth: width %d",
 2460             IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
 2461 
 2462         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2463             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2464             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2465         ieee80211_ref_node(ni);
 2466 
 2467         m = ieee80211_getmgtframe(&frm,
 2468             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2469             sizeof(uint16_t)    /* action+category */
 2470             /* XXX may action payload */
 2471             + sizeof(struct ieee80211_action_ba_addbaresponse)
 2472         );
 2473         if (m != NULL) {
 2474                 *frm++ = category;
 2475                 *frm++ = action;
 2476                 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 
 2477                         IEEE80211_A_HT_TXCHWIDTH_2040 :
 2478                         IEEE80211_A_HT_TXCHWIDTH_20;
 2479                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2480                 return ht_action_output(ni, m);
 2481         } else {
 2482                 vap->iv_stats.is_tx_nobuf++;
 2483                 ieee80211_free_node(ni);
 2484                 return ENOMEM;
 2485         }
 2486 }
 2487 #undef ADDSHORT
 2488 
 2489 /*
 2490  * Construct the MCS bit mask for inclusion in an HT capabilities
 2491  * information element.
 2492  */
 2493 static void
 2494 ieee80211_set_mcsset(struct ieee80211com *ic, uint8_t *frm)
 2495 {
 2496         int i;
 2497         uint8_t txparams;
 2498 
 2499         KASSERT((ic->ic_rxstream > 0 && ic->ic_rxstream <= 4),
 2500             ("ic_rxstream %d out of range", ic->ic_rxstream));
 2501         KASSERT((ic->ic_txstream > 0 && ic->ic_txstream <= 4),
 2502             ("ic_txstream %d out of range", ic->ic_txstream));
 2503 
 2504         for (i = 0; i < ic->ic_rxstream * 8; i++)
 2505                 setbit(frm, i);
 2506         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
 2507             (ic->ic_htcaps & IEEE80211_HTC_RXMCS32))
 2508                 setbit(frm, 32);
 2509         if (ic->ic_htcaps & IEEE80211_HTC_RXUNEQUAL) {
 2510                 if (ic->ic_rxstream >= 2) {
 2511                         for (i = 33; i <= 38; i++)
 2512                                 setbit(frm, i);
 2513                 }
 2514                 if (ic->ic_rxstream >= 3) {
 2515                         for (i = 39; i <= 52; i++)
 2516                                 setbit(frm, i);
 2517                 }
 2518                 if (ic->ic_txstream >= 4) {
 2519                         for (i = 53; i <= 76; i++)
 2520                                 setbit(frm, i);
 2521                 }
 2522         }
 2523 
 2524         if (ic->ic_rxstream != ic->ic_txstream) {
 2525                 txparams = 0x1;                 /* TX MCS set defined */
 2526                 txparams |= 0x2;                /* TX RX MCS not equal */
 2527                 txparams |= (ic->ic_txstream - 1) << 2; /* num TX streams */
 2528                 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL)
 2529                         txparams |= 0x16;       /* TX unequal modulation sup */
 2530         } else
 2531                 txparams = 0;
 2532         frm[12] = txparams;
 2533 }
 2534 
 2535 /*
 2536  * Add body of an HTCAP information element.
 2537  */
 2538 static uint8_t *
 2539 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
 2540 {
 2541 #define ADDSHORT(frm, v) do {                   \
 2542         frm[0] = (v) & 0xff;                    \
 2543         frm[1] = (v) >> 8;                      \
 2544         frm += 2;                               \
 2545 } while (0)
 2546         struct ieee80211com *ic = ni->ni_ic;
 2547         struct ieee80211vap *vap = ni->ni_vap;
 2548         uint16_t caps, extcaps;
 2549         int rxmax, density;
 2550 
 2551         /* HT capabilities */
 2552         caps = vap->iv_htcaps & 0xffff;
 2553         /*
 2554          * Note channel width depends on whether we are operating as
 2555          * a sta or not.  When operating as a sta we are generating
 2556          * a request based on our desired configuration.  Otherwise
 2557          * we are operational and the channel attributes identify
 2558          * how we've been setup (which might be different if a fixed
 2559          * channel is specified).
 2560          */
 2561         if (vap->iv_opmode == IEEE80211_M_STA) {
 2562                 /* override 20/40 use based on config */
 2563                 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
 2564                         caps |= IEEE80211_HTCAP_CHWIDTH40;
 2565                 else
 2566                         caps &= ~IEEE80211_HTCAP_CHWIDTH40;
 2567                 /* use advertised setting (XXX locally constraint) */
 2568                 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
 2569                 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
 2570 
 2571                 /*
 2572                  * NB: Hardware might support HT40 on some but not all
 2573                  * channels. We can't determine this earlier because only
 2574                  * after association the channel is upgraded to HT based
 2575                  * on the negotiated capabilities.
 2576                  */
 2577                 if (ni->ni_chan != IEEE80211_CHAN_ANYC &&
 2578                     findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40U) == NULL &&
 2579                     findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40D) == NULL)
 2580                         caps &= ~IEEE80211_HTCAP_CHWIDTH40;
 2581         } else {
 2582                 /* override 20/40 use based on current channel */
 2583                 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
 2584                         caps |= IEEE80211_HTCAP_CHWIDTH40;
 2585                 else
 2586                         caps &= ~IEEE80211_HTCAP_CHWIDTH40;
 2587                 rxmax = vap->iv_ampdu_rxmax;
 2588                 density = vap->iv_ampdu_density;
 2589         }
 2590         /* adjust short GI based on channel and config */
 2591         if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
 2592                 caps &= ~IEEE80211_HTCAP_SHORTGI20;
 2593         if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
 2594             (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
 2595                 caps &= ~IEEE80211_HTCAP_SHORTGI40;
 2596         ADDSHORT(frm, caps);
 2597 
 2598         /* HT parameters */
 2599         *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
 2600              | SM(density, IEEE80211_HTCAP_MPDUDENSITY)
 2601              ;
 2602         frm++;
 2603 
 2604         /* pre-zero remainder of ie */
 2605         memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 
 2606                 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
 2607 
 2608         /* supported MCS set */
 2609         /*
 2610          * XXX: For sta mode the rate set should be restricted based
 2611          * on the AP's capabilities, but ni_htrates isn't setup when
 2612          * we're called to form an AssocReq frame so for now we're
 2613          * restricted to the device capabilities.
 2614          */
 2615         ieee80211_set_mcsset(ni->ni_ic, frm);
 2616 
 2617         frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
 2618                 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
 2619 
 2620         /* HT extended capabilities */
 2621         extcaps = vap->iv_htextcaps & 0xffff;
 2622 
 2623         ADDSHORT(frm, extcaps);
 2624 
 2625         frm += sizeof(struct ieee80211_ie_htcap) -
 2626                 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
 2627 
 2628         return frm;
 2629 #undef ADDSHORT
 2630 }
 2631 
 2632 /*
 2633  * Add 802.11n HT capabilities information element
 2634  */
 2635 uint8_t *
 2636 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
 2637 {
 2638         frm[0] = IEEE80211_ELEMID_HTCAP;
 2639         frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
 2640         return ieee80211_add_htcap_body(frm + 2, ni);
 2641 }
 2642 
 2643 /*
 2644  * Add Broadcom OUI wrapped standard HTCAP ie; this is
 2645  * used for compatibility w/ pre-draft implementations.
 2646  */
 2647 uint8_t *
 2648 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
 2649 {
 2650         frm[0] = IEEE80211_ELEMID_VENDOR;
 2651         frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
 2652         frm[2] = (BCM_OUI >> 0) & 0xff;
 2653         frm[3] = (BCM_OUI >> 8) & 0xff;
 2654         frm[4] = (BCM_OUI >> 16) & 0xff;
 2655         frm[5] = BCM_OUI_HTCAP;
 2656         return ieee80211_add_htcap_body(frm + 6, ni);
 2657 }
 2658 
 2659 /*
 2660  * Construct the MCS bit mask of basic rates
 2661  * for inclusion in an HT information element.
 2662  */
 2663 static void
 2664 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
 2665 {
 2666         int i;
 2667 
 2668         for (i = 0; i < rs->rs_nrates; i++) {
 2669                 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
 2670                 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
 2671                     r < IEEE80211_HTRATE_MAXSIZE) {
 2672                         /* NB: this assumes a particular implementation */
 2673                         setbit(frm, r);
 2674                 }
 2675         }
 2676 }
 2677 
 2678 /*
 2679  * Update the HTINFO ie for a beacon frame.
 2680  */
 2681 void
 2682 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
 2683         struct ieee80211_beacon_offsets *bo)
 2684 {
 2685 #define PROTMODE        (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
 2686         const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan;
 2687         struct ieee80211com *ic = vap->iv_ic;
 2688         struct ieee80211_ie_htinfo *ht =
 2689            (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
 2690 
 2691         /* XXX only update on channel change */
 2692         ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
 2693         if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
 2694                 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
 2695         else
 2696                 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
 2697         if (IEEE80211_IS_CHAN_HT40U(bsschan))
 2698                 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
 2699         else if (IEEE80211_IS_CHAN_HT40D(bsschan))
 2700                 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
 2701         else
 2702                 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
 2703         if (IEEE80211_IS_CHAN_HT40(bsschan))
 2704                 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
 2705 
 2706         /* protection mode */
 2707         ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
 2708 
 2709         /* XXX propagate to vendor ie's */
 2710 #undef PROTMODE
 2711 }
 2712 
 2713 /*
 2714  * Add body of an HTINFO information element.
 2715  *
 2716  * NB: We don't use struct ieee80211_ie_htinfo because we can
 2717  * be called to fillin both a standard ie and a compat ie that
 2718  * has a vendor OUI at the front.
 2719  */
 2720 static uint8_t *
 2721 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
 2722 {
 2723         struct ieee80211vap *vap = ni->ni_vap;
 2724         struct ieee80211com *ic = ni->ni_ic;
 2725 
 2726         /* pre-zero remainder of ie */
 2727         memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
 2728 
 2729         /* primary/control channel center */
 2730         *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
 2731 
 2732         if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
 2733                 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
 2734         else
 2735                 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
 2736         if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
 2737                 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
 2738         else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
 2739                 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
 2740         else
 2741                 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
 2742         if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
 2743                 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
 2744 
 2745         frm[1] = ic->ic_curhtprotmode;
 2746 
 2747         frm += 5;
 2748 
 2749         /* basic MCS set */
 2750         ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
 2751         frm += sizeof(struct ieee80211_ie_htinfo) -
 2752                 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
 2753         return frm;
 2754 }
 2755 
 2756 /*
 2757  * Add 802.11n HT information information element.
 2758  */
 2759 uint8_t *
 2760 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
 2761 {
 2762         frm[0] = IEEE80211_ELEMID_HTINFO;
 2763         frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
 2764         return ieee80211_add_htinfo_body(frm + 2, ni);
 2765 }
 2766 
 2767 /*
 2768  * Add Broadcom OUI wrapped standard HTINFO ie; this is
 2769  * used for compatibility w/ pre-draft implementations.
 2770  */
 2771 uint8_t *
 2772 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
 2773 {
 2774         frm[0] = IEEE80211_ELEMID_VENDOR;
 2775         frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
 2776         frm[2] = (BCM_OUI >> 0) & 0xff;
 2777         frm[3] = (BCM_OUI >> 8) & 0xff;
 2778         frm[4] = (BCM_OUI >> 16) & 0xff;
 2779         frm[5] = BCM_OUI_HTINFO;
 2780         return ieee80211_add_htinfo_body(frm + 6, ni);
 2781 }

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