The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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/11.0/sys/net80211/ieee80211_ht.c 300232 2016-05-19 21:08:33Z avos $");
   29 #endif
   30 
   31 /*
   32  * IEEE 802.11n protocol support.
   33  */
   34 
   35 #include "opt_inet.h"
   36 #include "opt_wlan.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/kernel.h>
   40 #include <sys/malloc.h>
   41 #include <sys/systm.h> 
   42 #include <sys/endian.h>
   43  
   44 #include <sys/socket.h>
   45 
   46 #include <net/if.h>
   47 #include <net/if_var.h>
   48 #include <net/if_media.h>
   49 #include <net/ethernet.h>
   50 
   51 #include <net80211/ieee80211_var.h>
   52 #include <net80211/ieee80211_action.h>
   53 #include <net80211/ieee80211_input.h>
   54 
   55 /* define here, used throughout file */
   56 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
   57 #define SM(_v, _f)      (((_v) << _f##_S) & _f)
   58 
   59 const struct ieee80211_mcs_rates ieee80211_htrates[IEEE80211_HTRATE_MAXSIZE] = {
   60         {  13,  14,   27,   30 },       /* MCS 0 */
   61         {  26,  29,   54,   60 },       /* MCS 1 */
   62         {  39,  43,   81,   90 },       /* MCS 2 */
   63         {  52,  58,  108,  120 },       /* MCS 3 */
   64         {  78,  87,  162,  180 },       /* MCS 4 */
   65         { 104, 116,  216,  240 },       /* MCS 5 */
   66         { 117, 130,  243,  270 },       /* MCS 6 */
   67         { 130, 144,  270,  300 },       /* MCS 7 */
   68         {  26,  29,   54,   60 },       /* MCS 8 */
   69         {  52,  58,  108,  120 },       /* MCS 9 */
   70         {  78,  87,  162,  180 },       /* MCS 10 */
   71         { 104, 116,  216,  240 },       /* MCS 11 */
   72         { 156, 173,  324,  360 },       /* MCS 12 */
   73         { 208, 231,  432,  480 },       /* MCS 13 */
   74         { 234, 260,  486,  540 },       /* MCS 14 */
   75         { 260, 289,  540,  600 },       /* MCS 15 */
   76         {  39,  43,   81,   90 },       /* MCS 16 */
   77         {  78,  87,  162,  180 },       /* MCS 17 */
   78         { 117, 130,  243,  270 },       /* MCS 18 */
   79         { 156, 173,  324,  360 },       /* MCS 19 */
   80         { 234, 260,  486,  540 },       /* MCS 20 */
   81         { 312, 347,  648,  720 },       /* MCS 21 */
   82         { 351, 390,  729,  810 },       /* MCS 22 */
   83         { 390, 433,  810,  900 },       /* MCS 23 */
   84         {  52,  58,  108,  120 },       /* MCS 24 */
   85         { 104, 116,  216,  240 },       /* MCS 25 */
   86         { 156, 173,  324,  360 },       /* MCS 26 */
   87         { 208, 231,  432,  480 },       /* MCS 27 */
   88         { 312, 347,  648,  720 },       /* MCS 28 */
   89         { 416, 462,  864,  960 },       /* MCS 29 */
   90         { 468, 520,  972, 1080 },       /* MCS 30 */
   91         { 520, 578, 1080, 1200 },       /* MCS 31 */
   92         {   0,   0,   12,   13 },       /* MCS 32 */
   93         {  78,  87,  162,  180 },       /* MCS 33 */
   94         { 104, 116,  216,  240 },       /* MCS 34 */
   95         { 130, 144,  270,  300 },       /* MCS 35 */
   96         { 117, 130,  243,  270 },       /* MCS 36 */
   97         { 156, 173,  324,  360 },       /* MCS 37 */
   98         { 195, 217,  405,  450 },       /* MCS 38 */
   99         { 104, 116,  216,  240 },       /* MCS 39 */
  100         { 130, 144,  270,  300 },       /* MCS 40 */
  101         { 130, 144,  270,  300 },       /* MCS 41 */
  102         { 156, 173,  324,  360 },       /* MCS 42 */
  103         { 182, 202,  378,  420 },       /* MCS 43 */
  104         { 182, 202,  378,  420 },       /* MCS 44 */
  105         { 208, 231,  432,  480 },       /* MCS 45 */
  106         { 156, 173,  324,  360 },       /* MCS 46 */
  107         { 195, 217,  405,  450 },       /* MCS 47 */
  108         { 195, 217,  405,  450 },       /* MCS 48 */
  109         { 234, 260,  486,  540 },       /* MCS 49 */
  110         { 273, 303,  567,  630 },       /* MCS 50 */
  111         { 273, 303,  567,  630 },       /* MCS 51 */
  112         { 312, 347,  648,  720 },       /* MCS 52 */
  113         { 130, 144,  270,  300 },       /* MCS 53 */
  114         { 156, 173,  324,  360 },       /* MCS 54 */
  115         { 182, 202,  378,  420 },       /* MCS 55 */
  116         { 156, 173,  324,  360 },       /* MCS 56 */
  117         { 182, 202,  378,  420 },       /* MCS 57 */
  118         { 208, 231,  432,  480 },       /* MCS 58 */
  119         { 234, 260,  486,  540 },       /* MCS 59 */
  120         { 208, 231,  432,  480 },       /* MCS 60 */
  121         { 234, 260,  486,  540 },       /* MCS 61 */
  122         { 260, 289,  540,  600 },       /* MCS 62 */
  123         { 260, 289,  540,  600 },       /* MCS 63 */
  124         { 286, 318,  594,  660 },       /* MCS 64 */
  125         { 195, 217,  405,  450 },       /* MCS 65 */
  126         { 234, 260,  486,  540 },       /* MCS 66 */
  127         { 273, 303,  567,  630 },       /* MCS 67 */
  128         { 234, 260,  486,  540 },       /* MCS 68 */
  129         { 273, 303,  567,  630 },       /* MCS 69 */
  130         { 312, 347,  648,  720 },       /* MCS 70 */
  131         { 351, 390,  729,  810 },       /* MCS 71 */
  132         { 312, 347,  648,  720 },       /* MCS 72 */
  133         { 351, 390,  729,  810 },       /* MCS 73 */
  134         { 390, 433,  810,  900 },       /* MCS 74 */
  135         { 390, 433,  810,  900 },       /* MCS 75 */
  136         { 429, 477,  891,  990 },       /* MCS 76 */
  137 };
  138 
  139 static  int ieee80211_ampdu_age = -1;   /* threshold for ampdu reorder q (ms) */
  140 SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW,
  141         &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I",
  142         "AMPDU max reorder age (ms)");
  143 
  144 static  int ieee80211_recv_bar_ena = 1;
  145 SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena,
  146             0, "BAR frame processing (ena/dis)");
  147 
  148 static  int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */
  149 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW,
  150         &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
  151         "ADDBA request timeout (ms)");
  152 static  int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
  153 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW,
  154         &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
  155         "ADDBA request backoff (ms)");
  156 static  int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
  157 SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLFLAG_RW,
  158         &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
  159 
  160 static  int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
  161 static  int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
  162 
  163 static  ieee80211_recv_action_func ht_recv_action_ba_addba_request;
  164 static  ieee80211_recv_action_func ht_recv_action_ba_addba_response;
  165 static  ieee80211_recv_action_func ht_recv_action_ba_delba;
  166 static  ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave;
  167 static  ieee80211_recv_action_func ht_recv_action_ht_txchwidth;
  168 
  169 static  ieee80211_send_action_func ht_send_action_ba_addba;
  170 static  ieee80211_send_action_func ht_send_action_ba_delba;
  171 static  ieee80211_send_action_func ht_send_action_ht_txchwidth;
  172 
  173 static void
  174 ieee80211_ht_init(void)
  175 {
  176         /*
  177          * Setup HT parameters that depends on the clock frequency.
  178          */
  179         ieee80211_ampdu_age = msecs_to_ticks(500);
  180         ieee80211_addba_timeout = msecs_to_ticks(250);
  181         ieee80211_addba_backoff = msecs_to_ticks(10*1000);
  182         ieee80211_bar_timeout = msecs_to_ticks(250);
  183         /*
  184          * Register action frame handlers.
  185          */
  186         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 
  187             IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request);
  188         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 
  189             IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response);
  190         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 
  191             IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba);
  192         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT, 
  193             IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave);
  194         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT, 
  195             IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth);
  196 
  197         ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 
  198             IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba);
  199         ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 
  200             IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba);
  201         ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 
  202             IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba);
  203         ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT, 
  204             IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth);
  205 }
  206 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL);
  207 
  208 static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
  209         struct ieee80211_tx_ampdu *tap);
  210 static int ieee80211_addba_request(struct ieee80211_node *ni,
  211         struct ieee80211_tx_ampdu *tap,
  212         int dialogtoken, int baparamset, int batimeout);
  213 static int ieee80211_addba_response(struct ieee80211_node *ni,
  214         struct ieee80211_tx_ampdu *tap,
  215         int code, int baparamset, int batimeout);
  216 static void ieee80211_addba_stop(struct ieee80211_node *ni,
  217         struct ieee80211_tx_ampdu *tap);
  218 static void null_addba_response_timeout(struct ieee80211_node *ni,
  219         struct ieee80211_tx_ampdu *tap);
  220 
  221 static void ieee80211_bar_response(struct ieee80211_node *ni,
  222         struct ieee80211_tx_ampdu *tap, int status);
  223 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
  224 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
  225 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
  226         int baparamset, int batimeout, int baseqctl);
  227 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
  228 
  229 void
  230 ieee80211_ht_attach(struct ieee80211com *ic)
  231 {
  232         /* setup default aggregation policy */
  233         ic->ic_recv_action = ieee80211_recv_action;
  234         ic->ic_send_action = ieee80211_send_action;
  235         ic->ic_ampdu_enable = ieee80211_ampdu_enable;
  236         ic->ic_addba_request = ieee80211_addba_request;
  237         ic->ic_addba_response = ieee80211_addba_response;
  238         ic->ic_addba_response_timeout = null_addba_response_timeout;
  239         ic->ic_addba_stop = ieee80211_addba_stop;
  240         ic->ic_bar_response = ieee80211_bar_response;
  241         ic->ic_ampdu_rx_start = ampdu_rx_start;
  242         ic->ic_ampdu_rx_stop = ampdu_rx_stop;
  243 
  244         ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
  245         ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
  246 }
  247 
  248 void
  249 ieee80211_ht_detach(struct ieee80211com *ic)
  250 {
  251 }
  252 
  253 void
  254 ieee80211_ht_vattach(struct ieee80211vap *vap)
  255 {
  256 
  257         /* driver can override defaults */
  258         vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
  259         vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
  260         vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
  261         vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
  262         /* tx aggregation traffic thresholds */
  263         vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
  264         vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
  265         vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
  266         vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
  267 
  268         if (vap->iv_htcaps & IEEE80211_HTC_HT) {
  269                 /*
  270                  * Device is HT capable; enable all HT-related
  271                  * facilities by default.
  272                  * XXX these choices may be too aggressive.
  273                  */
  274                 vap->iv_flags_ht |= IEEE80211_FHT_HT
  275                                  |  IEEE80211_FHT_HTCOMPAT
  276                                  ;
  277                 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
  278                         vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
  279                 /* XXX infer from channel list? */
  280                 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
  281                         vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
  282                         if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
  283                                 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
  284                 }
  285                 /* enable RIFS if capable */
  286                 if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
  287                         vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
  288 
  289                 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
  290                 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
  291                 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
  292                         vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
  293                 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
  294                 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
  295                         vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
  296 
  297                 if (vap->iv_htcaps & IEEE80211_HTCAP_TXSTBC)
  298                         vap->iv_flags_ht |= IEEE80211_FHT_STBC_TX;
  299                 if (vap->iv_htcaps & IEEE80211_HTCAP_RXSTBC)
  300                         vap->iv_flags_ht |= IEEE80211_FHT_STBC_RX;
  301         }
  302         /* NB: disable default legacy WDS, too many issues right now */
  303         if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
  304                 vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
  305 }
  306 
  307 void
  308 ieee80211_ht_vdetach(struct ieee80211vap *vap)
  309 {
  310 }
  311 
  312 static int
  313 ht_getrate(struct ieee80211com *ic, int index, enum ieee80211_phymode mode,
  314     int ratetype)
  315 {
  316         int mword, rate;
  317 
  318         mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode);
  319         if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
  320                 return (0);
  321         switch (ratetype) {
  322         case 0:
  323                 rate = ieee80211_htrates[index].ht20_rate_800ns;
  324                 break;
  325         case 1:
  326                 rate = ieee80211_htrates[index].ht20_rate_400ns;
  327                 break;
  328         case 2:
  329                 rate = ieee80211_htrates[index].ht40_rate_800ns;
  330                 break;
  331         default:
  332                 rate = ieee80211_htrates[index].ht40_rate_400ns;
  333                 break;
  334         }
  335         return (rate);
  336 }
  337 
  338 static struct printranges {
  339         int     minmcs;
  340         int     maxmcs;
  341         int     txstream;
  342         int     ratetype;
  343         int     htcapflags;
  344 } ranges[] = {
  345         {  0,  7, 1, 0, 0 },
  346         {  8, 15, 2, 0, 0 },
  347         { 16, 23, 3, 0, 0 },
  348         { 24, 31, 4, 0, 0 },
  349         { 32,  0, 1, 2, IEEE80211_HTC_TXMCS32 },
  350         { 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL },
  351         { 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL },
  352         { 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL },
  353         {  0,  0, 0, 0, 0 },
  354 };
  355 
  356 static void
  357 ht_rateprint(struct ieee80211com *ic, enum ieee80211_phymode mode, int ratetype)
  358 {
  359         int minrate, maxrate;
  360         struct printranges *range;
  361 
  362         for (range = ranges; range->txstream != 0; range++) {
  363                 if (ic->ic_txstream < range->txstream)
  364                         continue;
  365                 if (range->htcapflags &&
  366                     (ic->ic_htcaps & range->htcapflags) == 0)
  367                         continue;
  368                 if (ratetype < range->ratetype)
  369                         continue;
  370                 minrate = ht_getrate(ic, range->minmcs, mode, ratetype);
  371                 maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype);
  372                 if (range->maxmcs) {
  373                         ic_printf(ic, "MCS %d-%d: %d%sMbps - %d%sMbps\n",
  374                             range->minmcs, range->maxmcs,
  375                             minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""),
  376                             maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : ""));
  377                 } else {
  378                         ic_printf(ic, "MCS %d: %d%sMbps\n", range->minmcs,
  379                             minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""));
  380                 }
  381         }
  382 }
  383 
  384 static void
  385 ht_announce(struct ieee80211com *ic, enum ieee80211_phymode mode)
  386 {
  387         const char *modestr = ieee80211_phymode_name[mode];
  388 
  389         ic_printf(ic, "%s MCS 20MHz\n", modestr);
  390         ht_rateprint(ic, mode, 0);
  391         if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) {
  392                 ic_printf(ic, "%s MCS 20MHz SGI\n", modestr);
  393                 ht_rateprint(ic, mode, 1);
  394         }
  395         if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
  396                 ic_printf(ic, "%s MCS 40MHz:\n", modestr);
  397                 ht_rateprint(ic, mode, 2);
  398         }
  399         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
  400             (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) {
  401                 ic_printf(ic, "%s MCS 40MHz SGI:\n", modestr);
  402                 ht_rateprint(ic, mode, 3);
  403         }
  404 }
  405 
  406 void
  407 ieee80211_ht_announce(struct ieee80211com *ic)
  408 {
  409 
  410         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
  411             isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
  412                 ic_printf(ic, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream);
  413         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
  414                 ht_announce(ic, IEEE80211_MODE_11NA);
  415         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
  416                 ht_announce(ic, IEEE80211_MODE_11NG);
  417 }
  418 
  419 static struct ieee80211_htrateset htrateset;
  420 
  421 const struct ieee80211_htrateset *
  422 ieee80211_get_suphtrates(struct ieee80211com *ic,
  423     const struct ieee80211_channel *c)
  424 {
  425 #define ADDRATE(x)      do {                                            \
  426         htrateset.rs_rates[htrateset.rs_nrates] = x;                    \
  427         htrateset.rs_nrates++;                                          \
  428 } while (0)
  429         int i;
  430 
  431         memset(&htrateset, 0, sizeof(struct ieee80211_htrateset));
  432         for (i = 0; i < ic->ic_txstream * 8; i++)
  433                 ADDRATE(i);
  434         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
  435             (ic->ic_htcaps & IEEE80211_HTC_TXMCS32))
  436                 ADDRATE(32);
  437         if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
  438                 if (ic->ic_txstream >= 2) {
  439                          for (i = 33; i <= 38; i++)
  440                                 ADDRATE(i);
  441                 }
  442                 if (ic->ic_txstream >= 3) {
  443                         for (i = 39; i <= 52; i++)
  444                                 ADDRATE(i);
  445                 }
  446                 if (ic->ic_txstream == 4) {
  447                         for (i = 53; i <= 76; i++)
  448                                 ADDRATE(i);
  449                 }
  450         }
  451         return &htrateset;
  452 #undef  ADDRATE
  453 }
  454 
  455 /*
  456  * Receive processing.
  457  */
  458 
  459 /*
  460  * Decap the encapsulated A-MSDU frames and dispatch all but
  461  * the last for delivery.  The last frame is returned for 
  462  * delivery via the normal path.
  463  */
  464 struct mbuf *
  465 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
  466 {
  467         struct ieee80211vap *vap = ni->ni_vap;
  468         int framelen;
  469         struct mbuf *n;
  470 
  471         /* discard 802.3 header inserted by ieee80211_decap */
  472         m_adj(m, sizeof(struct ether_header));
  473 
  474         vap->iv_stats.is_amsdu_decap++;
  475 
  476         for (;;) {
  477                 /*
  478                  * Decap the first frame, bust it apart from the
  479                  * remainder and deliver.  We leave the last frame
  480                  * delivery to the caller (for consistency with other
  481                  * code paths, could also do it here).
  482                  */
  483                 m = ieee80211_decap1(m, &framelen);
  484                 if (m == NULL) {
  485                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  486                             ni->ni_macaddr, "a-msdu", "%s", "decap failed");
  487                         vap->iv_stats.is_amsdu_tooshort++;
  488                         return NULL;
  489                 }
  490                 if (m->m_pkthdr.len == framelen)
  491                         break;
  492                 n = m_split(m, framelen, M_NOWAIT);
  493                 if (n == NULL) {
  494                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  495                             ni->ni_macaddr, "a-msdu",
  496                             "%s", "unable to split encapsulated frames");
  497                         vap->iv_stats.is_amsdu_split++;
  498                         m_freem(m);                     /* NB: must reclaim */
  499                         return NULL;
  500                 }
  501                 vap->iv_deliver_data(vap, ni, m);
  502 
  503                 /*
  504                  * Remove frame contents; each intermediate frame
  505                  * is required to be aligned to a 4-byte boundary.
  506                  */
  507                 m = n;
  508                 m_adj(m, roundup2(framelen, 4) - framelen);     /* padding */
  509         }
  510         return m;                               /* last delivered by caller */
  511 }
  512 
  513 /*
  514  * Purge all frames in the A-MPDU re-order queue.
  515  */
  516 static void
  517 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
  518 {
  519         struct mbuf *m;
  520         int i;
  521 
  522         for (i = 0; i < rap->rxa_wnd; i++) {
  523                 m = rap->rxa_m[i];
  524                 if (m != NULL) {
  525                         rap->rxa_m[i] = NULL;
  526                         rap->rxa_qbytes -= m->m_pkthdr.len;
  527                         m_freem(m);
  528                         if (--rap->rxa_qframes == 0)
  529                                 break;
  530                 }
  531         }
  532         KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
  533             ("lost %u data, %u frames on ampdu rx q",
  534             rap->rxa_qbytes, rap->rxa_qframes));
  535 }
  536 
  537 /*
  538  * Start A-MPDU rx/re-order processing for the specified TID.
  539  */
  540 static int
  541 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
  542         int baparamset, int batimeout, int baseqctl)
  543 {
  544         int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
  545 
  546         if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
  547                 /*
  548                  * AMPDU previously setup and not terminated with a DELBA,
  549                  * flush the reorder q's in case anything remains.
  550                  */
  551                 ampdu_rx_purge(rap);
  552         }
  553         memset(rap, 0, sizeof(*rap));
  554         rap->rxa_wnd = (bufsiz == 0) ?
  555             IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
  556         rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START);
  557         rap->rxa_flags |=  IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
  558 
  559         return 0;
  560 }
  561 
  562 /*
  563  * Public function; manually setup the RX ampdu state.
  564  */
  565 int
  566 ieee80211_ampdu_rx_start_ext(struct ieee80211_node *ni, int tid, int seq, int baw)
  567 {
  568         struct ieee80211_rx_ampdu *rap;
  569 
  570         /* XXX TODO: sanity check tid, seq, baw */
  571 
  572         rap = &ni->ni_rx_ampdu[tid];
  573 
  574         if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
  575                 /*
  576                  * AMPDU previously setup and not terminated with a DELBA,
  577                  * flush the reorder q's in case anything remains.
  578                  */
  579                 ampdu_rx_purge(rap);
  580         }
  581 
  582         memset(rap, 0, sizeof(*rap));
  583         rap->rxa_wnd = (baw== 0) ?
  584             IEEE80211_AGGR_BAWMAX : min(baw, IEEE80211_AGGR_BAWMAX);
  585         rap->rxa_start = seq;
  586         rap->rxa_flags |=  IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
  587 
  588         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
  589             "%s: tid=%d, start=%d, wnd=%d, flags=0x%08x\n",
  590             __func__,
  591             tid,
  592             seq,
  593             rap->rxa_wnd,
  594             rap->rxa_flags);
  595 
  596         return 0;
  597 }
  598 
  599 /*
  600  * Stop A-MPDU rx processing for the specified TID.
  601  */
  602 static void
  603 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
  604 {
  605 
  606         ampdu_rx_purge(rap);
  607         rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
  608 }
  609 
  610 /*
  611  * Dispatch a frame from the A-MPDU reorder queue.  The
  612  * frame is fed back into ieee80211_input marked with an
  613  * M_AMPDU_MPDU flag so it doesn't come back to us (it also
  614  * permits ieee80211_input to optimize re-processing).
  615  */
  616 static __inline void
  617 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
  618 {
  619         m->m_flags |= M_AMPDU_MPDU;     /* bypass normal processing */
  620         /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
  621         (void) ieee80211_input(ni, m, 0, 0);
  622 }
  623 
  624 /*
  625  * Dispatch as many frames as possible from the re-order queue.
  626  * Frames will always be "at the front"; we process all frames
  627  * up to the first empty slot in the window.  On completion we
  628  * cleanup state if there are still pending frames in the current
  629  * BA window.  We assume the frame at slot 0 is already handled
  630  * by the caller; we always start at slot 1.
  631  */
  632 static void
  633 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
  634 {
  635         struct ieee80211vap *vap = ni->ni_vap;
  636         struct mbuf *m;
  637         int i;
  638 
  639         /* flush run of frames */
  640         for (i = 1; i < rap->rxa_wnd; i++) {
  641                 m = rap->rxa_m[i];
  642                 if (m == NULL)
  643                         break;
  644                 rap->rxa_m[i] = NULL;
  645                 rap->rxa_qbytes -= m->m_pkthdr.len;
  646                 rap->rxa_qframes--;
  647 
  648                 ampdu_dispatch(ni, m);
  649         }
  650         /*
  651          * If frames remain, copy the mbuf pointers down so
  652          * they correspond to the offsets in the new window.
  653          */
  654         if (rap->rxa_qframes != 0) {
  655                 int n = rap->rxa_qframes, j;
  656                 for (j = i+1; j < rap->rxa_wnd; j++) {
  657                         if (rap->rxa_m[j] != NULL) {
  658                                 rap->rxa_m[j-i] = rap->rxa_m[j];
  659                                 rap->rxa_m[j] = NULL;
  660                                 if (--n == 0)
  661                                         break;
  662                         }
  663                 }
  664                 KASSERT(n == 0, ("lost %d frames", n));
  665                 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
  666         }
  667         /*
  668          * Adjust the start of the BA window to
  669          * reflect the frames just dispatched.
  670          */
  671         rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
  672         vap->iv_stats.is_ampdu_rx_oor += i;
  673 }
  674 
  675 /*
  676  * Dispatch all frames in the A-MPDU re-order queue.
  677  */
  678 static void
  679 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
  680 {
  681         struct ieee80211vap *vap = ni->ni_vap;
  682         struct mbuf *m;
  683         int i;
  684 
  685         for (i = 0; i < rap->rxa_wnd; i++) {
  686                 m = rap->rxa_m[i];
  687                 if (m == NULL)
  688                         continue;
  689                 rap->rxa_m[i] = NULL;
  690                 rap->rxa_qbytes -= m->m_pkthdr.len;
  691                 rap->rxa_qframes--;
  692                 vap->iv_stats.is_ampdu_rx_oor++;
  693 
  694                 ampdu_dispatch(ni, m);
  695                 if (rap->rxa_qframes == 0)
  696                         break;
  697         }
  698 }
  699 
  700 /*
  701  * Dispatch all frames in the A-MPDU re-order queue
  702  * preceding the specified sequence number.  This logic
  703  * handles window moves due to a received MSDU or BAR.
  704  */
  705 static void
  706 ampdu_rx_flush_upto(struct ieee80211_node *ni,
  707         struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
  708 {
  709         struct ieee80211vap *vap = ni->ni_vap;
  710         struct mbuf *m;
  711         ieee80211_seq seqno;
  712         int i;
  713 
  714         /*
  715          * Flush any complete MSDU's with a sequence number lower
  716          * than winstart.  Gaps may exist.  Note that we may actually
  717          * dispatch frames past winstart if a run continues; this is
  718          * an optimization that avoids having to do a separate pass
  719          * to dispatch frames after moving the BA window start.
  720          */
  721         seqno = rap->rxa_start;
  722         for (i = 0; i < rap->rxa_wnd; i++) {
  723                 m = rap->rxa_m[i];
  724                 if (m != NULL) {
  725                         rap->rxa_m[i] = NULL;
  726                         rap->rxa_qbytes -= m->m_pkthdr.len;
  727                         rap->rxa_qframes--;
  728                         vap->iv_stats.is_ampdu_rx_oor++;
  729 
  730                         ampdu_dispatch(ni, m);
  731                 } else {
  732                         if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
  733                                 break;
  734                 }
  735                 seqno = IEEE80211_SEQ_INC(seqno);
  736         }
  737         /*
  738          * If frames remain, copy the mbuf pointers down so
  739          * they correspond to the offsets in the new window.
  740          */
  741         if (rap->rxa_qframes != 0) {
  742                 int n = rap->rxa_qframes, j;
  743 
  744                 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
  745                 KASSERT(rap->rxa_m[0] == NULL,
  746                     ("%s: BA window slot 0 occupied", __func__));
  747                 for (j = i+1; j < rap->rxa_wnd; j++) {
  748                         if (rap->rxa_m[j] != NULL) {
  749                                 rap->rxa_m[j-i] = rap->rxa_m[j];
  750                                 rap->rxa_m[j] = NULL;
  751                                 if (--n == 0)
  752                                         break;
  753                         }
  754                 }
  755                 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
  756                     "BA win <%d:%d> winstart %d",
  757                     __func__, n, rap->rxa_qframes, i, rap->rxa_start,
  758                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  759                     winstart));
  760                 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
  761         }
  762         /*
  763          * Move the start of the BA window; we use the
  764          * sequence number of the last MSDU that was
  765          * passed up the stack+1 or winstart if stopped on
  766          * a gap in the reorder buffer.
  767          */
  768         rap->rxa_start = seqno;
  769 }
  770 
  771 /*
  772  * Process a received QoS data frame for an HT station.  Handle
  773  * A-MPDU reordering: if this frame is received out of order
  774  * and falls within the BA window hold onto it.  Otherwise if
  775  * this frame completes a run, flush any pending frames.  We
  776  * return 1 if the frame is consumed.  A 0 is returned if
  777  * the frame should be processed normally by the caller.
  778  */
  779 int
  780 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
  781 {
  782 #define IEEE80211_FC0_QOSDATA \
  783         (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
  784 #define PROCESS         0       /* caller should process frame */
  785 #define CONSUMED        1       /* frame consumed, caller does nothing */
  786         struct ieee80211vap *vap = ni->ni_vap;
  787         struct ieee80211_qosframe *wh;
  788         struct ieee80211_rx_ampdu *rap;
  789         ieee80211_seq rxseq;
  790         uint8_t tid;
  791         int off;
  792 
  793         KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
  794             ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
  795         KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
  796 
  797         /* NB: m_len known to be sufficient */
  798         wh = mtod(m, struct ieee80211_qosframe *);
  799         if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
  800                 /*
  801                  * Not QoS data, shouldn't get here but just
  802                  * return it to the caller for processing.
  803                  */
  804                 return PROCESS;
  805         }
  806         if (IEEE80211_IS_DSTODS(wh))
  807                 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
  808         else
  809                 tid = wh->i_qos[0];
  810         tid &= IEEE80211_QOS_TID;
  811         rap = &ni->ni_rx_ampdu[tid];
  812         if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
  813                 /*
  814                  * No ADDBA request yet, don't touch.
  815                  */
  816                 return PROCESS;
  817         }
  818         rxseq = le16toh(*(uint16_t *)wh->i_seq);
  819         if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
  820                 /*
  821                  * Fragments are not allowed; toss.
  822                  */
  823                 IEEE80211_DISCARD_MAC(vap,
  824                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
  825                     "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
  826                     wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
  827                 vap->iv_stats.is_ampdu_rx_drop++;
  828                 IEEE80211_NODE_STAT(ni, rx_drop);
  829                 m_freem(m);
  830                 return CONSUMED;
  831         }
  832         rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
  833         rap->rxa_nframes++;
  834 again:
  835         if (rxseq == rap->rxa_start) {
  836                 /*
  837                  * First frame in window.
  838                  */
  839                 if (rap->rxa_qframes != 0) {
  840                         /*
  841                          * Dispatch as many packets as we can.
  842                          */
  843                         KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
  844                         ampdu_dispatch(ni, m);
  845                         ampdu_rx_dispatch(rap, ni);
  846                         return CONSUMED;
  847                 } else {
  848                         /*
  849                          * In order; advance window and notify
  850                          * caller to dispatch directly.
  851                          */
  852                         rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
  853                         return PROCESS;
  854                 }
  855         }
  856         /*
  857          * Frame is out of order; store if in the BA window.
  858          */
  859         /* calculate offset in BA window */
  860         off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
  861         if (off < rap->rxa_wnd) {
  862                 /*
  863                  * Common case (hopefully): in the BA window.
  864                  * Sec 9.10.7.6.2 a) (p.137)
  865                  */
  866 
  867                 /* 
  868                  * Check for frames sitting too long in the reorder queue.
  869                  * This should only ever happen if frames are not delivered
  870                  * without the sender otherwise notifying us (e.g. with a
  871                  * BAR to move the window).  Typically this happens because
  872                  * of vendor bugs that cause the sequence number to jump.
  873                  * When this happens we get a gap in the reorder queue that
  874                  * leaves frame sitting on the queue until they get pushed
  875                  * out due to window moves.  When the vendor does not send
  876                  * BAR this move only happens due to explicit packet sends
  877                  *
  878                  * NB: we only track the time of the oldest frame in the
  879                  * reorder q; this means that if we flush we might push
  880                  * frames that still "new"; if this happens then subsequent
  881                  * frames will result in BA window moves which cost something
  882                  * but is still better than a big throughput dip.
  883                  */
  884                 if (rap->rxa_qframes != 0) {
  885                         /* XXX honor batimeout? */
  886                         if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
  887                                 /*
  888                                  * Too long since we received the first
  889                                  * frame; flush the reorder buffer.
  890                                  */
  891                                 if (rap->rxa_qframes != 0) {
  892                                         vap->iv_stats.is_ampdu_rx_age +=
  893                                             rap->rxa_qframes;
  894                                         ampdu_rx_flush(ni, rap);
  895                                 }
  896                                 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
  897                                 return PROCESS;
  898                         }
  899                 } else {
  900                         /*
  901                          * First frame, start aging timer.
  902                          */
  903                         rap->rxa_age = ticks;
  904                 }
  905 
  906                 /* save packet */
  907                 if (rap->rxa_m[off] == NULL) {
  908                         rap->rxa_m[off] = m;
  909                         rap->rxa_qframes++;
  910                         rap->rxa_qbytes += m->m_pkthdr.len;
  911                         vap->iv_stats.is_ampdu_rx_reorder++;
  912                 } else {
  913                         IEEE80211_DISCARD_MAC(vap,
  914                             IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
  915                             ni->ni_macaddr, "a-mpdu duplicate",
  916                             "seqno %u tid %u BA win <%u:%u>",
  917                             rxseq, tid, rap->rxa_start,
  918                             IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
  919                         vap->iv_stats.is_rx_dup++;
  920                         IEEE80211_NODE_STAT(ni, rx_dup);
  921                         m_freem(m);
  922                 }
  923                 return CONSUMED;
  924         }
  925         if (off < IEEE80211_SEQ_BA_RANGE) {
  926                 /*
  927                  * Outside the BA window, but within range;
  928                  * flush the reorder q and move the window.
  929                  * Sec 9.10.7.6.2 b) (p.138)
  930                  */
  931                 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
  932                     "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
  933                     rap->rxa_start,
  934                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  935                     rap->rxa_qframes, rxseq, tid);
  936                 vap->iv_stats.is_ampdu_rx_move++;
  937 
  938                 /*
  939                  * The spec says to flush frames up to but not including:
  940                  *      WinStart_B = rxseq - rap->rxa_wnd + 1
  941                  * Then insert the frame or notify the caller to process
  942                  * it immediately.  We can safely do this by just starting
  943                  * over again because we know the frame will now be within
  944                  * the BA window.
  945                  */
  946                 /* NB: rxa_wnd known to be >0 */
  947                 ampdu_rx_flush_upto(ni, rap,
  948                     IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
  949                 goto again;
  950         } else {
  951                 /*
  952                  * Outside the BA window and out of range; toss.
  953                  * Sec 9.10.7.6.2 c) (p.138)
  954                  */
  955                 IEEE80211_DISCARD_MAC(vap,
  956                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
  957                     "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
  958                     rap->rxa_start,
  959                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
  960                     rap->rxa_qframes, rxseq, tid,
  961                     wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
  962                 vap->iv_stats.is_ampdu_rx_drop++;
  963                 IEEE80211_NODE_STAT(ni, rx_drop);
  964                 m_freem(m);
  965                 return CONSUMED;
  966         }
  967 #undef CONSUMED
  968 #undef PROCESS
  969 #undef IEEE80211_FC0_QOSDATA
  970 }
  971 
  972 /*
  973  * Process a BAR ctl frame.  Dispatch all frames up to
  974  * the sequence number of the frame.  If this frame is
  975  * out of range it's discarded.
  976  */
  977 void
  978 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
  979 {
  980         struct ieee80211vap *vap = ni->ni_vap;
  981         struct ieee80211_frame_bar *wh;
  982         struct ieee80211_rx_ampdu *rap;
  983         ieee80211_seq rxseq;
  984         int tid, off;
  985 
  986         if (!ieee80211_recv_bar_ena) {
  987 #if 0
  988                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
  989                     ni->ni_macaddr, "BAR", "%s", "processing disabled");
  990 #endif
  991                 vap->iv_stats.is_ampdu_bar_bad++;
  992                 return;
  993         }
  994         wh = mtod(m0, struct ieee80211_frame_bar *);
  995         /* XXX check basic BAR */
  996         tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
  997         rap = &ni->ni_rx_ampdu[tid];
  998         if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
  999                 /*
 1000                  * No ADDBA request yet, don't touch.
 1001                  */
 1002                 IEEE80211_DISCARD_MAC(vap,
 1003                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
 1004                     ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
 1005                 vap->iv_stats.is_ampdu_bar_bad++;
 1006                 return;
 1007         }
 1008         vap->iv_stats.is_ampdu_bar_rx++;
 1009         rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
 1010         if (rxseq == rap->rxa_start)
 1011                 return;
 1012         /* calculate offset in BA window */
 1013         off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
 1014         if (off < IEEE80211_SEQ_BA_RANGE) {
 1015                 /*
 1016                  * Flush the reorder q up to rxseq and move the window.
 1017                  * Sec 9.10.7.6.3 a) (p.138)
 1018                  */
 1019                 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
 1020                     "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
 1021                     rap->rxa_start,
 1022                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
 1023                     rap->rxa_qframes, rxseq, tid);
 1024                 vap->iv_stats.is_ampdu_bar_move++;
 1025 
 1026                 ampdu_rx_flush_upto(ni, rap, rxseq);
 1027                 if (off >= rap->rxa_wnd) {
 1028                         /*
 1029                          * BAR specifies a window start to the right of BA
 1030                          * window; we must move it explicitly since
 1031                          * ampdu_rx_flush_upto will not.
 1032                          */
 1033                         rap->rxa_start = rxseq;
 1034                 }
 1035         } else {
 1036                 /*
 1037                  * Out of range; toss.
 1038                  * Sec 9.10.7.6.3 b) (p.138)
 1039                  */
 1040                 IEEE80211_DISCARD_MAC(vap,
 1041                     IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
 1042                     "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
 1043                     rap->rxa_start,
 1044                     IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
 1045                     rap->rxa_qframes, rxseq, tid,
 1046                     wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
 1047                 vap->iv_stats.is_ampdu_bar_oow++;
 1048                 IEEE80211_NODE_STAT(ni, rx_drop);
 1049         }
 1050 }
 1051 
 1052 /*
 1053  * Setup HT-specific state in a node.  Called only
 1054  * when HT use is negotiated so we don't do extra
 1055  * work for temporary and/or legacy sta's.
 1056  */
 1057 void
 1058 ieee80211_ht_node_init(struct ieee80211_node *ni)
 1059 {
 1060         struct ieee80211_tx_ampdu *tap;
 1061         int tid;
 1062 
 1063         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 1064             ni,
 1065             "%s: called (%p)",
 1066             __func__,
 1067             ni);
 1068 
 1069         if (ni->ni_flags & IEEE80211_NODE_HT) {
 1070                 /*
 1071                  * Clean AMPDU state on re-associate.  This handles the case
 1072                  * where a station leaves w/o notifying us and then returns
 1073                  * before node is reaped for inactivity.
 1074                  */
 1075                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 1076                     ni,
 1077                     "%s: calling cleanup (%p)",
 1078                     __func__, ni);
 1079                 ieee80211_ht_node_cleanup(ni);
 1080         }
 1081         for (tid = 0; tid < WME_NUM_TID; tid++) {
 1082                 tap = &ni->ni_tx_ampdu[tid];
 1083                 tap->txa_tid = tid;
 1084                 tap->txa_ni = ni;
 1085                 ieee80211_txampdu_init_pps(tap);
 1086                 /* NB: further initialization deferred */
 1087         }
 1088         ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
 1089 }
 1090 
 1091 /*
 1092  * Cleanup HT-specific state in a node.  Called only
 1093  * when HT use has been marked.
 1094  */
 1095 void
 1096 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
 1097 {
 1098         struct ieee80211com *ic = ni->ni_ic;
 1099         int i;
 1100 
 1101         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 1102             ni,
 1103             "%s: called (%p)",
 1104             __func__, ni);
 1105 
 1106         KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
 1107 
 1108         /* XXX optimize this */
 1109         for (i = 0; i < WME_NUM_TID; i++) {
 1110                 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
 1111                 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
 1112                         ampdu_tx_stop(tap);
 1113         }
 1114         for (i = 0; i < WME_NUM_TID; i++)
 1115                 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
 1116 
 1117         ni->ni_htcap = 0;
 1118         ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
 1119 }
 1120 
 1121 /*
 1122  * Age out HT resources for a station.
 1123  */
 1124 void
 1125 ieee80211_ht_node_age(struct ieee80211_node *ni)
 1126 {
 1127         struct ieee80211vap *vap = ni->ni_vap;
 1128         uint8_t tid;
 1129 
 1130         KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
 1131 
 1132         for (tid = 0; tid < WME_NUM_TID; tid++) {
 1133                 struct ieee80211_rx_ampdu *rap;
 1134 
 1135                 rap = &ni->ni_rx_ampdu[tid];
 1136                 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
 1137                         continue;
 1138                 if (rap->rxa_qframes == 0)
 1139                         continue;
 1140                 /* 
 1141                  * Check for frames sitting too long in the reorder queue.
 1142                  * See above for more details on what's happening here.
 1143                  */
 1144                 /* XXX honor batimeout? */
 1145                 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
 1146                         /*
 1147                          * Too long since we received the first
 1148                          * frame; flush the reorder buffer.
 1149                          */
 1150                         vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
 1151                         ampdu_rx_flush(ni, rap);
 1152                 }
 1153         }
 1154 }
 1155 
 1156 static struct ieee80211_channel *
 1157 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
 1158 {
 1159         return ieee80211_find_channel(ic, c->ic_freq,
 1160             (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
 1161 }
 1162 
 1163 /*
 1164  * Adjust a channel to be HT/non-HT according to the vap's configuration.
 1165  */
 1166 struct ieee80211_channel *
 1167 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
 1168         struct ieee80211_channel *chan, int flags)
 1169 {
 1170         struct ieee80211_channel *c;
 1171 
 1172         if (flags & IEEE80211_FHT_HT) {
 1173                 /* promote to HT if possible */
 1174                 if (flags & IEEE80211_FHT_USEHT40) {
 1175                         if (!IEEE80211_IS_CHAN_HT40(chan)) {
 1176                                 /* NB: arbitrarily pick ht40+ over ht40- */
 1177                                 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
 1178                                 if (c == NULL)
 1179                                         c = findhtchan(ic, chan,
 1180                                                 IEEE80211_CHAN_HT40D);
 1181                                 if (c == NULL)
 1182                                         c = findhtchan(ic, chan,
 1183                                                 IEEE80211_CHAN_HT20);
 1184                                 if (c != NULL)
 1185                                         chan = c;
 1186                         }
 1187                 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
 1188                         c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
 1189                         if (c != NULL)
 1190                                 chan = c;
 1191                 }
 1192         } else if (IEEE80211_IS_CHAN_HT(chan)) {
 1193                 /* demote to legacy, HT use is disabled */
 1194                 c = ieee80211_find_channel(ic, chan->ic_freq,
 1195                     chan->ic_flags &~ IEEE80211_CHAN_HT);
 1196                 if (c != NULL)
 1197                         chan = c;
 1198         }
 1199         return chan;
 1200 }
 1201 
 1202 /*
 1203  * Setup HT-specific state for a legacy WDS peer.
 1204  */
 1205 void
 1206 ieee80211_ht_wds_init(struct ieee80211_node *ni)
 1207 {
 1208         struct ieee80211vap *vap = ni->ni_vap;
 1209         struct ieee80211_tx_ampdu *tap;
 1210         int tid;
 1211 
 1212         KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
 1213 
 1214         /* XXX check scan cache in case peer has an ap and we have info */
 1215         /*
 1216          * If setup with a legacy channel; locate an HT channel.
 1217          * Otherwise if the inherited channel (from a companion
 1218          * AP) is suitable use it so we use the same location
 1219          * for the extension channel).
 1220          */
 1221         ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
 1222             ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
 1223 
 1224         ni->ni_htcap = 0;
 1225         if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
 1226                 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
 1227         if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
 1228                 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
 1229                 ni->ni_chw = 40;
 1230                 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
 1231                         ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
 1232                 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
 1233                         ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
 1234                 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
 1235                         ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
 1236         } else {
 1237                 ni->ni_chw = 20;
 1238                 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
 1239         }
 1240         ni->ni_htctlchan = ni->ni_chan->ic_ieee;
 1241         if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
 1242                 ni->ni_flags |= IEEE80211_NODE_RIFS;
 1243         /* XXX does it make sense to enable SMPS? */
 1244 
 1245         ni->ni_htopmode = 0;            /* XXX need protection state */
 1246         ni->ni_htstbc = 0;              /* XXX need info */
 1247 
 1248         for (tid = 0; tid < WME_NUM_TID; tid++) {
 1249                 tap = &ni->ni_tx_ampdu[tid];
 1250                 tap->txa_tid = tid;
 1251                 ieee80211_txampdu_init_pps(tap);
 1252         }
 1253         /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
 1254         ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
 1255 }
 1256 
 1257 /*
 1258  * Notify hostap vaps of a change in the HTINFO ie.
 1259  */
 1260 static void
 1261 htinfo_notify(struct ieee80211com *ic)
 1262 {
 1263         struct ieee80211vap *vap;
 1264         int first = 1;
 1265 
 1266         IEEE80211_LOCK_ASSERT(ic);
 1267 
 1268         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
 1269                 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
 1270                         continue;
 1271                 if (vap->iv_state != IEEE80211_S_RUN ||
 1272                     !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
 1273                         continue;
 1274                 if (first) {
 1275                         IEEE80211_NOTE(vap,
 1276                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
 1277                             vap->iv_bss,
 1278                             "HT bss occupancy change: %d sta, %d ht, "
 1279                             "%d ht40%s, HT protmode now 0x%x"
 1280                             , ic->ic_sta_assoc
 1281                             , ic->ic_ht_sta_assoc
 1282                             , ic->ic_ht40_sta_assoc
 1283                             , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ?
 1284                                  ", non-HT sta present" : ""
 1285                             , ic->ic_curhtprotmode);
 1286                         first = 0;
 1287                 }
 1288                 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
 1289         }
 1290 }
 1291 
 1292 /*
 1293  * Calculate HT protection mode from current
 1294  * state and handle updates.
 1295  */
 1296 static void
 1297 htinfo_update(struct ieee80211com *ic)
 1298 {
 1299         uint8_t protmode;
 1300 
 1301         if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
 1302                 protmode = IEEE80211_HTINFO_OPMODE_MIXED
 1303                          | IEEE80211_HTINFO_NONHT_PRESENT;
 1304         } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) {
 1305                 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
 1306                          | IEEE80211_HTINFO_NONHT_PRESENT;
 1307         } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
 1308             IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 
 1309             ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
 1310                 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
 1311         } else {
 1312                 protmode = IEEE80211_HTINFO_OPMODE_PURE;
 1313         }
 1314         if (protmode != ic->ic_curhtprotmode) {
 1315                 ic->ic_curhtprotmode = protmode;
 1316                 htinfo_notify(ic);
 1317         }
 1318 }
 1319 
 1320 /*
 1321  * Handle an HT station joining a BSS.
 1322  */
 1323 void
 1324 ieee80211_ht_node_join(struct ieee80211_node *ni)
 1325 {
 1326         struct ieee80211com *ic = ni->ni_ic;
 1327 
 1328         IEEE80211_LOCK_ASSERT(ic);
 1329 
 1330         if (ni->ni_flags & IEEE80211_NODE_HT) {
 1331                 ic->ic_ht_sta_assoc++;
 1332                 if (ni->ni_chw == 40)
 1333                         ic->ic_ht40_sta_assoc++;
 1334         }
 1335         htinfo_update(ic);
 1336 }
 1337 
 1338 /*
 1339  * Handle an HT station leaving a BSS.
 1340  */
 1341 void
 1342 ieee80211_ht_node_leave(struct ieee80211_node *ni)
 1343 {
 1344         struct ieee80211com *ic = ni->ni_ic;
 1345 
 1346         IEEE80211_LOCK_ASSERT(ic);
 1347 
 1348         if (ni->ni_flags & IEEE80211_NODE_HT) {
 1349                 ic->ic_ht_sta_assoc--;
 1350                 if (ni->ni_chw == 40)
 1351                         ic->ic_ht40_sta_assoc--;
 1352         }
 1353         htinfo_update(ic);
 1354 }
 1355 
 1356 /*
 1357  * Public version of htinfo_update; used for processing
 1358  * beacon frames from overlapping bss.
 1359  *
 1360  * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
 1361  * (on receipt of a beacon that advertises MIXED) or
 1362  * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
 1363  * from an overlapping legacy bss).  We treat MIXED with
 1364  * a higher precedence than PROTOPT (i.e. we will not change
 1365  * change PROTOPT -> MIXED; only MIXED -> PROTOPT).  This
 1366  * corresponds to how we handle things in htinfo_update.
 1367  */
 1368 void
 1369 ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
 1370 {
 1371 #define OPMODE(x)       SM(x, IEEE80211_HTINFO_OPMODE)
 1372         IEEE80211_LOCK(ic);
 1373 
 1374         /* track non-HT station presence */
 1375         KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
 1376             ("protmode 0x%x", protmode));
 1377         ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
 1378         ic->ic_lastnonht = ticks;
 1379 
 1380         if (protmode != ic->ic_curhtprotmode &&
 1381             (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
 1382              OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
 1383                 /* push beacon update */
 1384                 ic->ic_curhtprotmode = protmode;
 1385                 htinfo_notify(ic);
 1386         }
 1387         IEEE80211_UNLOCK(ic);
 1388 #undef OPMODE
 1389 }
 1390 
 1391 /*
 1392  * Time out presence of an overlapping bss with non-HT
 1393  * stations.  When operating in hostap mode we listen for
 1394  * beacons from other stations and if we identify a non-HT
 1395  * station is present we update the opmode field of the
 1396  * HTINFO ie.  To identify when all non-HT stations are
 1397  * gone we time out this condition.
 1398  */
 1399 void
 1400 ieee80211_ht_timeout(struct ieee80211com *ic)
 1401 {
 1402         IEEE80211_LOCK_ASSERT(ic);
 1403 
 1404         if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) &&
 1405             ieee80211_time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
 1406 #if 0
 1407                 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
 1408                     "%s", "time out non-HT STA present on channel");
 1409 #endif
 1410                 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
 1411                 htinfo_update(ic);
 1412         }
 1413 }
 1414 
 1415 /*
 1416  * Process an 802.11n HT capabilities ie.
 1417  */
 1418 void
 1419 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
 1420 {
 1421         if (ie[0] == IEEE80211_ELEMID_VENDOR) {
 1422                 /*
 1423                  * Station used Vendor OUI ie to associate;
 1424                  * mark the node so when we respond we'll use
 1425                  * the Vendor OUI's and not the standard ie's.
 1426                  */
 1427                 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
 1428                 ie += 4;
 1429         } else
 1430                 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
 1431 
 1432         ni->ni_htcap = le16dec(ie +
 1433                 __offsetof(struct ieee80211_ie_htcap, hc_cap));
 1434         ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
 1435 }
 1436 
 1437 static void
 1438 htinfo_parse(struct ieee80211_node *ni,
 1439         const struct ieee80211_ie_htinfo *htinfo)
 1440 {
 1441         uint16_t w;
 1442 
 1443         ni->ni_htctlchan = htinfo->hi_ctrlchannel;
 1444         ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
 1445         w = le16dec(&htinfo->hi_byte2);
 1446         ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
 1447         w = le16dec(&htinfo->hi_byte45);
 1448         ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
 1449 }
 1450 
 1451 /*
 1452  * Parse an 802.11n HT info ie and save useful information
 1453  * to the node state.  Note this does not effect any state
 1454  * changes such as for channel width change.
 1455  */
 1456 void
 1457 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
 1458 {
 1459         if (ie[0] == IEEE80211_ELEMID_VENDOR)
 1460                 ie += 4;
 1461         htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
 1462 }
 1463 
 1464 /*
 1465  * Handle 11n channel switch.  Use the received HT ie's to
 1466  * identify the right channel to use.  If we cannot locate it
 1467  * in the channel table then fallback to legacy operation.
 1468  * Note that we use this information to identify the node's
 1469  * channel only; the caller is responsible for insuring any
 1470  * required channel change is done (e.g. in sta mode when
 1471  * parsing the contents of a beacon frame).
 1472  */
 1473 static int
 1474 htinfo_update_chw(struct ieee80211_node *ni, int htflags)
 1475 {
 1476         struct ieee80211com *ic = ni->ni_ic;
 1477         struct ieee80211_channel *c;
 1478         int chanflags;
 1479         int ret = 0;
 1480 
 1481         chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
 1482         if (chanflags != ni->ni_chan->ic_flags) {
 1483                 /* XXX not right for ht40- */
 1484                 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
 1485                 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
 1486                         /*
 1487                          * No HT40 channel entry in our table; fall back
 1488                          * to HT20 operation.  This should not happen.
 1489                          */
 1490                         c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
 1491 #if 0
 1492                         IEEE80211_NOTE(ni->ni_vap,
 1493                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
 1494                             "no HT40 channel (freq %u), falling back to HT20",
 1495                             ni->ni_chan->ic_freq);
 1496 #endif
 1497                         /* XXX stat */
 1498                 }
 1499                 if (c != NULL && c != ni->ni_chan) {
 1500                         IEEE80211_NOTE(ni->ni_vap,
 1501                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
 1502                             "switch station to HT%d channel %u/0x%x",
 1503                             IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
 1504                             c->ic_freq, c->ic_flags);
 1505                         ni->ni_chan = c;
 1506                         ret = 1;
 1507                 }
 1508                 /* NB: caller responsible for forcing any channel change */
 1509         }
 1510         /* update node's tx channel width */
 1511         ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
 1512         return (ret);
 1513 }
 1514 
 1515 /*
 1516  * Update 11n MIMO PS state according to received htcap.
 1517  */
 1518 static __inline int
 1519 htcap_update_mimo_ps(struct ieee80211_node *ni)
 1520 {
 1521         uint16_t oflags = ni->ni_flags;
 1522 
 1523         switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
 1524         case IEEE80211_HTCAP_SMPS_DYNAMIC:
 1525                 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
 1526                 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
 1527                 break;
 1528         case IEEE80211_HTCAP_SMPS_ENA:
 1529                 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
 1530                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
 1531                 break;
 1532         case IEEE80211_HTCAP_SMPS_OFF:
 1533         default:                /* disable on rx of reserved value */
 1534                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
 1535                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
 1536                 break;
 1537         }
 1538         return (oflags ^ ni->ni_flags);
 1539 }
 1540 
 1541 /*
 1542  * Update short GI state according to received htcap
 1543  * and local settings.
 1544  */
 1545 static __inline void
 1546 htcap_update_shortgi(struct ieee80211_node *ni)
 1547 {
 1548         struct ieee80211vap *vap = ni->ni_vap;
 1549 
 1550         ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
 1551         if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
 1552             (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
 1553                 ni->ni_flags |= IEEE80211_NODE_SGI20;
 1554         if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
 1555             (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
 1556                 ni->ni_flags |= IEEE80211_NODE_SGI40;
 1557 }
 1558 
 1559 /*
 1560  * Parse and update HT-related state extracted from
 1561  * the HT cap and info ie's.
 1562  */
 1563 int
 1564 ieee80211_ht_updateparams(struct ieee80211_node *ni,
 1565         const uint8_t *htcapie, const uint8_t *htinfoie)
 1566 {
 1567         struct ieee80211vap *vap = ni->ni_vap;
 1568         const struct ieee80211_ie_htinfo *htinfo;
 1569         int htflags;
 1570         int ret = 0;
 1571 
 1572         ieee80211_parse_htcap(ni, htcapie);
 1573         if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
 1574                 htcap_update_mimo_ps(ni);
 1575         htcap_update_shortgi(ni);
 1576 
 1577         if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
 1578                 htinfoie += 4;
 1579         htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
 1580         htinfo_parse(ni, htinfo);
 1581 
 1582         htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
 1583             IEEE80211_CHAN_HT20 : 0;
 1584         /* NB: honor operating mode constraint */
 1585         if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
 1586             (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
 1587                 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
 1588                         htflags = IEEE80211_CHAN_HT40U;
 1589                 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
 1590                         htflags = IEEE80211_CHAN_HT40D;
 1591         }
 1592         if (htinfo_update_chw(ni, htflags))
 1593                 ret = 1;
 1594 
 1595         if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
 1596             (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
 1597                 ni->ni_flags |= IEEE80211_NODE_RIFS;
 1598         else
 1599                 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
 1600 
 1601         return (ret);
 1602 }
 1603 
 1604 /*
 1605  * Parse and update HT-related state extracted from the HT cap ie
 1606  * for a station joining an HT BSS.
 1607  */
 1608 void
 1609 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
 1610 {
 1611         struct ieee80211vap *vap = ni->ni_vap;
 1612         int htflags;
 1613 
 1614         ieee80211_parse_htcap(ni, htcapie);
 1615         if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
 1616                 htcap_update_mimo_ps(ni);
 1617         htcap_update_shortgi(ni);
 1618 
 1619         /* NB: honor operating mode constraint */
 1620         /* XXX 40 MHz intolerant */
 1621         htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
 1622             IEEE80211_CHAN_HT20 : 0;
 1623         if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
 1624             (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
 1625                 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
 1626                         htflags = IEEE80211_CHAN_HT40U;
 1627                 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
 1628                         htflags = IEEE80211_CHAN_HT40D;
 1629         }
 1630         (void) htinfo_update_chw(ni, htflags);
 1631 }
 1632 
 1633 /*
 1634  * Install received HT rate set by parsing the HT cap ie.
 1635  */
 1636 int
 1637 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
 1638 {
 1639         struct ieee80211com *ic = ni->ni_ic;
 1640         struct ieee80211vap *vap = ni->ni_vap;
 1641         const struct ieee80211_ie_htcap *htcap;
 1642         struct ieee80211_htrateset *rs;
 1643         int i, maxequalmcs, maxunequalmcs;
 1644 
 1645         maxequalmcs = ic->ic_txstream * 8 - 1;
 1646         maxunequalmcs = 0;
 1647         if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
 1648                 if (ic->ic_txstream >= 2)
 1649                         maxunequalmcs = 38;
 1650                 if (ic->ic_txstream >= 3)
 1651                         maxunequalmcs = 52;
 1652                 if (ic->ic_txstream >= 4)
 1653                         maxunequalmcs = 76;
 1654         }
 1655 
 1656         rs = &ni->ni_htrates;
 1657         memset(rs, 0, sizeof(*rs));
 1658         if (ie != NULL) {
 1659                 if (ie[0] == IEEE80211_ELEMID_VENDOR)
 1660                         ie += 4;
 1661                 htcap = (const struct ieee80211_ie_htcap *) ie;
 1662                 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
 1663                         if (isclr(htcap->hc_mcsset, i))
 1664                                 continue;
 1665                         if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
 1666                                 IEEE80211_NOTE(vap,
 1667                                     IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
 1668                                     "WARNING, HT rate set too large; only "
 1669                                     "using %u rates", IEEE80211_HTRATE_MAXSIZE);
 1670                                 vap->iv_stats.is_rx_rstoobig++;
 1671                                 break;
 1672                         }
 1673                         if (i <= 31 && i > maxequalmcs)
 1674                                 continue;
 1675                         if (i == 32 &&
 1676                             (ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0)
 1677                                 continue;
 1678                         if (i > 32 && i > maxunequalmcs)
 1679                                 continue;
 1680                         rs->rs_rates[rs->rs_nrates++] = i;
 1681                 }
 1682         }
 1683         return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
 1684 }
 1685 
 1686 /*
 1687  * Mark rates in a node's HT rate set as basic according
 1688  * to the information in the supplied HT info ie.
 1689  */
 1690 void
 1691 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
 1692 {
 1693         const struct ieee80211_ie_htinfo *htinfo;
 1694         struct ieee80211_htrateset *rs;
 1695         int i, j;
 1696 
 1697         if (ie[0] == IEEE80211_ELEMID_VENDOR)
 1698                 ie += 4;
 1699         htinfo = (const struct ieee80211_ie_htinfo *) ie;
 1700         rs = &ni->ni_htrates;
 1701         if (rs->rs_nrates == 0) {
 1702                 IEEE80211_NOTE(ni->ni_vap,
 1703                     IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
 1704                     "%s", "WARNING, empty HT rate set");
 1705                 return;
 1706         }
 1707         for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
 1708                 if (isclr(htinfo->hi_basicmcsset, i))
 1709                         continue;
 1710                 for (j = 0; j < rs->rs_nrates; j++)
 1711                         if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
 1712                                 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
 1713         }
 1714 }
 1715 
 1716 static void
 1717 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
 1718 {
 1719         callout_init(&tap->txa_timer, 1);
 1720         tap->txa_flags |= IEEE80211_AGGR_SETUP;
 1721         tap->txa_lastsample = ticks;
 1722 }
 1723 
 1724 static void
 1725 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
 1726 {
 1727         struct ieee80211_node *ni = tap->txa_ni;
 1728         struct ieee80211com *ic = ni->ni_ic;
 1729 
 1730         IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
 1731             tap->txa_ni,
 1732             "%s: called",
 1733             __func__);
 1734 
 1735         KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
 1736             ("txa_flags 0x%x tid %d ac %d", tap->txa_flags, tap->txa_tid,
 1737             TID_TO_WME_AC(tap->txa_tid)));
 1738 
 1739         /*
 1740          * Stop BA stream if setup so driver has a chance
 1741          * to reclaim any resources it might have allocated.
 1742          */
 1743         ic->ic_addba_stop(ni, tap);
 1744         /*
 1745          * Stop any pending BAR transmit.
 1746          */
 1747         bar_stop_timer(tap);
 1748 
 1749         /*
 1750          * Reset packet estimate.
 1751          */
 1752         ieee80211_txampdu_init_pps(tap);
 1753 
 1754         /* NB: clearing NAK means we may re-send ADDBA */ 
 1755         tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
 1756 }
 1757 
 1758 /*
 1759  * ADDBA response timeout.
 1760  *
 1761  * If software aggregation and per-TID queue management was done here,
 1762  * that queue would be unpaused after the ADDBA timeout occurs.
 1763  */
 1764 static void
 1765 addba_timeout(void *arg)
 1766 {
 1767         struct ieee80211_tx_ampdu *tap = arg;
 1768         struct ieee80211_node *ni = tap->txa_ni;
 1769         struct ieee80211com *ic = ni->ni_ic;
 1770 
 1771         /* XXX ? */
 1772         tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
 1773         tap->txa_attempts++;
 1774         ic->ic_addba_response_timeout(ni, tap);
 1775 }
 1776 
 1777 static void
 1778 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
 1779 {
 1780         /* XXX use CALLOUT_PENDING instead? */
 1781         callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
 1782             addba_timeout, tap);
 1783         tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
 1784         tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
 1785 }
 1786 
 1787 static void
 1788 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
 1789 {
 1790         /* XXX use CALLOUT_PENDING instead? */
 1791         if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
 1792                 callout_stop(&tap->txa_timer);
 1793                 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
 1794         }
 1795 }
 1796 
 1797 static void
 1798 null_addba_response_timeout(struct ieee80211_node *ni,
 1799     struct ieee80211_tx_ampdu *tap)
 1800 {
 1801 }
 1802 
 1803 /*
 1804  * Default method for requesting A-MPDU tx aggregation.
 1805  * We setup the specified state block and start a timer
 1806  * to wait for an ADDBA response frame.
 1807  */
 1808 static int
 1809 ieee80211_addba_request(struct ieee80211_node *ni,
 1810         struct ieee80211_tx_ampdu *tap,
 1811         int dialogtoken, int baparamset, int batimeout)
 1812 {
 1813         int bufsiz;
 1814 
 1815         /* XXX locking */
 1816         tap->txa_token = dialogtoken;
 1817         tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
 1818         bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
 1819         tap->txa_wnd = (bufsiz == 0) ?
 1820             IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
 1821         addba_start_timeout(tap);
 1822         return 1;
 1823 }
 1824 
 1825 /*
 1826  * Called by drivers that wish to request an ADDBA session be
 1827  * setup.  This brings it up and starts the request timer.
 1828  */
 1829 int
 1830 ieee80211_ampdu_tx_request_ext(struct ieee80211_node *ni, int tid)
 1831 {
 1832         struct ieee80211_tx_ampdu *tap;
 1833 
 1834         if (tid < 0 || tid > 15)
 1835                 return (0);
 1836         tap = &ni->ni_tx_ampdu[tid];
 1837 
 1838         /* XXX locking */
 1839         if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
 1840                 /* do deferred setup of state */
 1841                 ampdu_tx_setup(tap);
 1842         }
 1843         /* XXX hack for not doing proper locking */
 1844         tap->txa_flags &= ~IEEE80211_AGGR_NAK;
 1845         addba_start_timeout(tap);
 1846         return (1);
 1847 }
 1848 
 1849 /*
 1850  * Called by drivers that have marked a session as active.
 1851  */
 1852 int
 1853 ieee80211_ampdu_tx_request_active_ext(struct ieee80211_node *ni, int tid,
 1854     int status)
 1855 {
 1856         struct ieee80211_tx_ampdu *tap;
 1857 
 1858         if (tid < 0 || tid > 15)
 1859                 return (0);
 1860         tap = &ni->ni_tx_ampdu[tid];
 1861 
 1862         /* XXX locking */
 1863         addba_stop_timeout(tap);
 1864         if (status == 1) {
 1865                 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
 1866                 tap->txa_attempts = 0;
 1867         } else {
 1868                 /* mark tid so we don't try again */
 1869                 tap->txa_flags |= IEEE80211_AGGR_NAK;
 1870         }
 1871         return (1);
 1872 }
 1873 
 1874 /*
 1875  * Default method for processing an A-MPDU tx aggregation
 1876  * response.  We shutdown any pending timer and update the
 1877  * state block according to the reply.
 1878  */
 1879 static int
 1880 ieee80211_addba_response(struct ieee80211_node *ni,
 1881         struct ieee80211_tx_ampdu *tap,
 1882         int status, int baparamset, int batimeout)
 1883 {
 1884         int bufsiz, tid;
 1885 
 1886         /* XXX locking */
 1887         addba_stop_timeout(tap);
 1888         if (status == IEEE80211_STATUS_SUCCESS) {
 1889                 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
 1890                 /* XXX override our request? */
 1891                 tap->txa_wnd = (bufsiz == 0) ?
 1892                     IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
 1893                 /* XXX AC/TID */
 1894                 tid = MS(baparamset, IEEE80211_BAPS_TID);
 1895                 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
 1896                 tap->txa_attempts = 0;
 1897         } else {
 1898                 /* mark tid so we don't try again */
 1899                 tap->txa_flags |= IEEE80211_AGGR_NAK;
 1900         }
 1901         return 1;
 1902 }
 1903 
 1904 /*
 1905  * Default method for stopping A-MPDU tx aggregation.
 1906  * Any timer is cleared and we drain any pending frames.
 1907  */
 1908 static void
 1909 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
 1910 {
 1911         /* XXX locking */
 1912         addba_stop_timeout(tap);
 1913         if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
 1914                 /* XXX clear aggregation queue */
 1915                 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
 1916         }
 1917         tap->txa_attempts = 0;
 1918 }
 1919 
 1920 /*
 1921  * Process a received action frame using the default aggregation
 1922  * policy.  We intercept ADDBA-related frames and use them to
 1923  * update our aggregation state.  All other frames are passed up
 1924  * for processing by ieee80211_recv_action.
 1925  */
 1926 static int
 1927 ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
 1928         const struct ieee80211_frame *wh,
 1929         const uint8_t *frm, const uint8_t *efrm)
 1930 {
 1931         struct ieee80211com *ic = ni->ni_ic;
 1932         struct ieee80211vap *vap = ni->ni_vap;
 1933         struct ieee80211_rx_ampdu *rap;
 1934         uint8_t dialogtoken;
 1935         uint16_t baparamset, batimeout, baseqctl;
 1936         uint16_t args[5];
 1937         int tid;
 1938 
 1939         dialogtoken = frm[2];
 1940         baparamset = le16dec(frm+3);
 1941         batimeout = le16dec(frm+5);
 1942         baseqctl = le16dec(frm+7);
 1943 
 1944         tid = MS(baparamset, IEEE80211_BAPS_TID);
 1945 
 1946         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 1947             "recv ADDBA request: dialogtoken %u baparamset 0x%x "
 1948             "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d",
 1949             dialogtoken, baparamset,
 1950             tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ),
 1951             batimeout,
 1952             MS(baseqctl, IEEE80211_BASEQ_START),
 1953             MS(baseqctl, IEEE80211_BASEQ_FRAG));
 1954 
 1955         rap = &ni->ni_rx_ampdu[tid];
 1956 
 1957         /* Send ADDBA response */
 1958         args[0] = dialogtoken;
 1959         /*
 1960          * NB: We ack only if the sta associated with HT and
 1961          * the ap is configured to do AMPDU rx (the latter
 1962          * violates the 11n spec and is mostly for testing).
 1963          */
 1964         if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
 1965             (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
 1966                 /* XXX handle ampdu_rx_start failure */
 1967                 ic->ic_ampdu_rx_start(ni, rap,
 1968                     baparamset, batimeout, baseqctl);
 1969 
 1970                 args[1] = IEEE80211_STATUS_SUCCESS;
 1971         } else {
 1972                 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 1973                     ni, "reject ADDBA request: %s",
 1974                     ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
 1975                        "administratively disabled" :
 1976                        "not negotiated for station");
 1977                 vap->iv_stats.is_addba_reject++;
 1978                 args[1] = IEEE80211_STATUS_UNSPECIFIED;
 1979         }
 1980         /* XXX honor rap flags? */
 1981         args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
 1982                 | SM(tid, IEEE80211_BAPS_TID)
 1983                 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
 1984                 ;
 1985         args[3] = 0;
 1986         args[4] = 0;
 1987         ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
 1988                 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
 1989         return 0;
 1990 }
 1991 
 1992 static int
 1993 ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
 1994         const struct ieee80211_frame *wh,
 1995         const uint8_t *frm, const uint8_t *efrm)
 1996 {
 1997         struct ieee80211com *ic = ni->ni_ic;
 1998         struct ieee80211vap *vap = ni->ni_vap;
 1999         struct ieee80211_tx_ampdu *tap;
 2000         uint8_t dialogtoken, policy;
 2001         uint16_t baparamset, batimeout, code;
 2002         int tid, bufsiz;
 2003 
 2004         dialogtoken = frm[2];
 2005         code = le16dec(frm+3);
 2006         baparamset = le16dec(frm+5);
 2007         tid = MS(baparamset, IEEE80211_BAPS_TID);
 2008         bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
 2009         policy = MS(baparamset, IEEE80211_BAPS_POLICY);
 2010         batimeout = le16dec(frm+7);
 2011 
 2012         tap = &ni->ni_tx_ampdu[tid];
 2013         if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
 2014                 IEEE80211_DISCARD_MAC(vap,
 2015                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 2016                     ni->ni_macaddr, "ADDBA response",
 2017                     "no pending ADDBA, tid %d dialogtoken %u "
 2018                     "code %d", tid, dialogtoken, code);
 2019                 vap->iv_stats.is_addba_norequest++;
 2020                 return 0;
 2021         }
 2022         if (dialogtoken != tap->txa_token) {
 2023                 IEEE80211_DISCARD_MAC(vap,
 2024                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 2025                     ni->ni_macaddr, "ADDBA response",
 2026                     "dialogtoken mismatch: waiting for %d, "
 2027                     "received %d, tid %d code %d",
 2028                     tap->txa_token, dialogtoken, tid, code);
 2029                 vap->iv_stats.is_addba_badtoken++;
 2030                 return 0;
 2031         }
 2032         /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
 2033         if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
 2034                 IEEE80211_DISCARD_MAC(vap,
 2035                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 2036                     ni->ni_macaddr, "ADDBA response",
 2037                     "policy mismatch: expecting %s, "
 2038                     "received %s, tid %d code %d",
 2039                     tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
 2040                     policy, tid, code);
 2041                 vap->iv_stats.is_addba_badpolicy++;
 2042                 return 0;
 2043         }
 2044 #if 0
 2045         /* XXX we take MIN in ieee80211_addba_response */
 2046         if (bufsiz > IEEE80211_AGGR_BAWMAX) {
 2047                 IEEE80211_DISCARD_MAC(vap,
 2048                     IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 2049                     ni->ni_macaddr, "ADDBA response",
 2050                     "BA window too large: max %d, "
 2051                     "received %d, tid %d code %d",
 2052                     bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
 2053                 vap->iv_stats.is_addba_badbawinsize++;
 2054                 return 0;
 2055         }
 2056 #endif
 2057         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2058             "recv ADDBA response: dialogtoken %u code %d "
 2059             "baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
 2060             dialogtoken, code, baparamset, tid, bufsiz,
 2061             batimeout);
 2062         ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
 2063         return 0;
 2064 }
 2065 
 2066 static int
 2067 ht_recv_action_ba_delba(struct ieee80211_node *ni,
 2068         const struct ieee80211_frame *wh,
 2069         const uint8_t *frm, const uint8_t *efrm)
 2070 {
 2071         struct ieee80211com *ic = ni->ni_ic;
 2072         struct ieee80211_rx_ampdu *rap;
 2073         struct ieee80211_tx_ampdu *tap;
 2074         uint16_t baparamset, code;
 2075         int tid;
 2076 
 2077         baparamset = le16dec(frm+2);
 2078         code = le16dec(frm+4);
 2079 
 2080         tid = MS(baparamset, IEEE80211_DELBAPS_TID);
 2081 
 2082         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2083             "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
 2084             "code %d", baparamset, tid,
 2085             MS(baparamset, IEEE80211_DELBAPS_INIT), code);
 2086 
 2087         if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
 2088                 tap = &ni->ni_tx_ampdu[tid];
 2089                 ic->ic_addba_stop(ni, tap);
 2090         } else {
 2091                 rap = &ni->ni_rx_ampdu[tid];
 2092                 ic->ic_ampdu_rx_stop(ni, rap);
 2093         }
 2094         return 0;
 2095 }
 2096 
 2097 static int
 2098 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
 2099         const struct ieee80211_frame *wh,
 2100         const uint8_t *frm, const uint8_t *efrm)
 2101 {
 2102         int chw;
 2103 
 2104         chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20;
 2105 
 2106         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2107             "%s: HT txchwidth, width %d%s",
 2108             __func__, chw, ni->ni_chw != chw ? "*" : "");
 2109         if (chw != ni->ni_chw) {
 2110                 ni->ni_chw = chw;
 2111                 /* XXX notify on change */
 2112         }
 2113         return 0;
 2114 }
 2115 
 2116 static int
 2117 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
 2118         const struct ieee80211_frame *wh,
 2119         const uint8_t *frm, const uint8_t *efrm)
 2120 {
 2121         const struct ieee80211_action_ht_mimopowersave *mps =
 2122             (const struct ieee80211_action_ht_mimopowersave *) frm;
 2123 
 2124         /* XXX check iv_htcaps */
 2125         if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
 2126                 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
 2127         else
 2128                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
 2129         if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
 2130                 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
 2131         else
 2132                 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
 2133         /* XXX notify on change */
 2134         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2135             "%s: HT MIMO PS (%s%s)", __func__,
 2136             (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ?  "on" : "off",
 2137             (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ?  "+rts" : ""
 2138         );
 2139         return 0;
 2140 }
 2141 
 2142 /*
 2143  * Transmit processing.
 2144  */
 2145 
 2146 /*
 2147  * Check if A-MPDU should be requested/enabled for a stream.
 2148  * We require a traffic rate above a per-AC threshold and we
 2149  * also handle backoff from previous failed attempts.
 2150  *
 2151  * Drivers may override this method to bring in information
 2152  * such as link state conditions in making the decision.
 2153  */
 2154 static int
 2155 ieee80211_ampdu_enable(struct ieee80211_node *ni,
 2156         struct ieee80211_tx_ampdu *tap)
 2157 {
 2158         struct ieee80211vap *vap = ni->ni_vap;
 2159 
 2160         if (tap->txa_avgpps <
 2161             vap->iv_ampdu_mintraffic[TID_TO_WME_AC(tap->txa_tid)])
 2162                 return 0;
 2163         /* XXX check rssi? */
 2164         if (tap->txa_attempts >= ieee80211_addba_maxtries &&
 2165             ieee80211_time_after(ticks, tap->txa_nextrequest)) {
 2166                 /*
 2167                  * Don't retry too often; txa_nextrequest is set
 2168                  * to the minimum interval we'll retry after
 2169                  * ieee80211_addba_maxtries failed attempts are made.
 2170                  */
 2171                 return 0;
 2172         }
 2173         IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
 2174             "enable AMPDU on tid %d (%s), avgpps %d pkts %d attempt %d",
 2175             tap->txa_tid, ieee80211_wme_acnames[TID_TO_WME_AC(tap->txa_tid)],
 2176             tap->txa_avgpps, tap->txa_pkts, tap->txa_attempts);
 2177         return 1;
 2178 }
 2179 
 2180 /*
 2181  * Request A-MPDU tx aggregation.  Setup local state and
 2182  * issue an ADDBA request.  BA use will only happen after
 2183  * the other end replies with ADDBA response.
 2184  */
 2185 int
 2186 ieee80211_ampdu_request(struct ieee80211_node *ni,
 2187         struct ieee80211_tx_ampdu *tap)
 2188 {
 2189         struct ieee80211com *ic = ni->ni_ic;
 2190         uint16_t args[5];
 2191         int tid, dialogtoken;
 2192         static int tokens = 0;  /* XXX */
 2193 
 2194         /* XXX locking */
 2195         if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
 2196                 /* do deferred setup of state */
 2197                 ampdu_tx_setup(tap);
 2198         }
 2199         /* XXX hack for not doing proper locking */
 2200         tap->txa_flags &= ~IEEE80211_AGGR_NAK;
 2201 
 2202         dialogtoken = (tokens+1) % 63;          /* XXX */
 2203         tid = tap->txa_tid;
 2204         tap->txa_start = ni->ni_txseqs[tid];
 2205 
 2206         args[0] = dialogtoken;
 2207         args[1] = 0;    /* NB: status code not used */
 2208         args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
 2209                 | SM(tid, IEEE80211_BAPS_TID)
 2210                 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
 2211                 ;
 2212         args[3] = 0;    /* batimeout */
 2213         /* NB: do first so there's no race against reply */
 2214         if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) {
 2215                 /* unable to setup state, don't make request */
 2216                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2217                     ni, "%s: could not setup BA stream for TID %d AC %d",
 2218                     __func__, tap->txa_tid, TID_TO_WME_AC(tap->txa_tid));
 2219                 /* defer next try so we don't slam the driver with requests */
 2220                 tap->txa_attempts = ieee80211_addba_maxtries;
 2221                 /* NB: check in case driver wants to override */
 2222                 if (tap->txa_nextrequest <= ticks)
 2223                         tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
 2224                 return 0;
 2225         }
 2226         tokens = dialogtoken;                   /* allocate token */
 2227         /* NB: after calling ic_addba_request so driver can set txa_start */
 2228         args[4] = SM(tap->txa_start, IEEE80211_BASEQ_START)
 2229                 | SM(0, IEEE80211_BASEQ_FRAG)
 2230                 ;
 2231         return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
 2232                 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
 2233 }
 2234 
 2235 /*
 2236  * Terminate an AMPDU tx stream.  State is reclaimed
 2237  * and the peer notified with a DelBA Action frame.
 2238  */
 2239 void
 2240 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
 2241         int reason)
 2242 {
 2243         struct ieee80211com *ic = ni->ni_ic;
 2244         struct ieee80211vap *vap = ni->ni_vap;
 2245         uint16_t args[4];
 2246 
 2247         /* XXX locking */
 2248         tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
 2249         if (IEEE80211_AMPDU_RUNNING(tap)) {
 2250                 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 2251                     ni, "%s: stop BA stream for TID %d (reason: %d (%s))",
 2252                     __func__, tap->txa_tid, reason,
 2253                     ieee80211_reason_to_string(reason));
 2254                 vap->iv_stats.is_ampdu_stop++;
 2255 
 2256                 ic->ic_addba_stop(ni, tap);
 2257                 args[0] = tap->txa_tid;
 2258                 args[1] = IEEE80211_DELBAPS_INIT;
 2259                 args[2] = reason;                       /* XXX reason code */
 2260                 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
 2261                         IEEE80211_ACTION_BA_DELBA, args);
 2262         } else {
 2263                 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
 2264                     ni, "%s: BA stream for TID %d not running "
 2265                     "(reason: %d (%s))", __func__, tap->txa_tid, reason,
 2266                     ieee80211_reason_to_string(reason));
 2267                 vap->iv_stats.is_ampdu_stop_failed++;
 2268         }
 2269 }
 2270 
 2271 /* XXX */
 2272 static void bar_start_timer(struct ieee80211_tx_ampdu *tap);
 2273 
 2274 static void
 2275 bar_timeout(void *arg)
 2276 {
 2277         struct ieee80211_tx_ampdu *tap = arg;
 2278         struct ieee80211_node *ni = tap->txa_ni;
 2279 
 2280         KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
 2281             ("bar/addba collision, flags 0x%x", tap->txa_flags));
 2282 
 2283         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2284             ni, "%s: tid %u flags 0x%x attempts %d", __func__,
 2285             tap->txa_tid, tap->txa_flags, tap->txa_attempts);
 2286 
 2287         /* guard against race with bar_tx_complete */
 2288         if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
 2289                 return;
 2290         /* XXX ? */
 2291         if (tap->txa_attempts >= ieee80211_bar_maxtries) {
 2292                 struct ieee80211com *ic = ni->ni_ic;
 2293 
 2294                 ni->ni_vap->iv_stats.is_ampdu_bar_tx_fail++;
 2295                 /*
 2296                  * If (at least) the last BAR TX timeout was due to
 2297                  * an ieee80211_send_bar() failures, then we need
 2298                  * to make sure we notify the driver that a BAR
 2299                  * TX did occur and fail.  This gives the driver
 2300                  * a chance to undo any queue pause that may
 2301                  * have occurred.
 2302                  */
 2303                 ic->ic_bar_response(ni, tap, 1);
 2304                 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
 2305         } else {
 2306                 ni->ni_vap->iv_stats.is_ampdu_bar_tx_retry++;
 2307                 if (ieee80211_send_bar(ni, tap, tap->txa_seqpending) != 0) {
 2308                         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2309                             ni, "%s: failed to TX, starting timer\n",
 2310                             __func__);
 2311                         /*
 2312                          * If ieee80211_send_bar() fails here, the
 2313                          * timer may have stopped and/or the pending
 2314                          * flag may be clear.  Because of this,
 2315                          * fake the BARPEND and reset the timer.
 2316                          * A retransmission attempt will then occur
 2317                          * during the next timeout.
 2318                          */
 2319                         /* XXX locking */
 2320                         tap->txa_flags |= IEEE80211_AGGR_BARPEND;
 2321                         bar_start_timer(tap);
 2322                 }
 2323         }
 2324 }
 2325 
 2326 static void
 2327 bar_start_timer(struct ieee80211_tx_ampdu *tap)
 2328 {
 2329         IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
 2330             tap->txa_ni,
 2331             "%s: called",
 2332             __func__);
 2333         callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
 2334 }
 2335 
 2336 static void
 2337 bar_stop_timer(struct ieee80211_tx_ampdu *tap)
 2338 {
 2339         IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
 2340             tap->txa_ni,
 2341             "%s: called",
 2342             __func__);
 2343         callout_stop(&tap->txa_timer);
 2344 }
 2345 
 2346 static void
 2347 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
 2348 {
 2349         struct ieee80211_tx_ampdu *tap = arg;
 2350 
 2351         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2352             ni, "%s: tid %u flags 0x%x pending %d status %d",
 2353             __func__, tap->txa_tid, tap->txa_flags,
 2354             callout_pending(&tap->txa_timer), status);
 2355 
 2356         ni->ni_vap->iv_stats.is_ampdu_bar_tx++;
 2357         /* XXX locking */
 2358         if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
 2359             callout_pending(&tap->txa_timer)) {
 2360                 struct ieee80211com *ic = ni->ni_ic;
 2361 
 2362                 if (status == 0)                /* ACK'd */
 2363                         bar_stop_timer(tap);
 2364                 ic->ic_bar_response(ni, tap, status);
 2365                 /* NB: just let timer expire so we pace requests */
 2366         }
 2367 }
 2368 
 2369 static void
 2370 ieee80211_bar_response(struct ieee80211_node *ni,
 2371         struct ieee80211_tx_ampdu *tap, int status)
 2372 {
 2373 
 2374         IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
 2375             tap->txa_ni,
 2376             "%s: called",
 2377             __func__);
 2378         if (status == 0) {              /* got ACK */
 2379                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
 2380                     ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
 2381                     tap->txa_start,
 2382                     IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
 2383                     tap->txa_qframes, tap->txa_seqpending,
 2384                     tap->txa_tid);
 2385 
 2386                 /* NB: timer already stopped in bar_tx_complete */
 2387                 tap->txa_start = tap->txa_seqpending;
 2388                 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
 2389         }
 2390 }
 2391 
 2392 /*
 2393  * Transmit a BAR frame to the specified node.  The
 2394  * BAR contents are drawn from the supplied aggregation
 2395  * state associated with the node.
 2396  *
 2397  * NB: we only handle immediate ACK w/ compressed bitmap.
 2398  */
 2399 int
 2400 ieee80211_send_bar(struct ieee80211_node *ni,
 2401         struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
 2402 {
 2403 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
 2404         struct ieee80211vap *vap = ni->ni_vap;
 2405         struct ieee80211com *ic = ni->ni_ic;
 2406         struct ieee80211_frame_bar *bar;
 2407         struct mbuf *m;
 2408         uint16_t barctl, barseqctl;
 2409         uint8_t *frm;
 2410         int tid, ret;
 2411 
 2412 
 2413         IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
 2414             tap->txa_ni,
 2415             "%s: called",
 2416             __func__);
 2417 
 2418         if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
 2419                 /* no ADDBA response, should not happen */
 2420                 /* XXX stat+msg */
 2421                 return EINVAL;
 2422         }
 2423         /* XXX locking */
 2424         bar_stop_timer(tap);
 2425 
 2426         ieee80211_ref_node(ni);
 2427 
 2428         m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
 2429         if (m == NULL)
 2430                 senderr(ENOMEM, is_tx_nobuf);
 2431 
 2432         if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
 2433                 m_freem(m);
 2434                 senderr(ENOMEM, is_tx_nobuf);   /* XXX */
 2435                 /* NOTREACHED */
 2436         }
 2437 
 2438         bar = mtod(m, struct ieee80211_frame_bar *);
 2439         bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
 2440                 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
 2441         bar->i_fc[1] = 0;
 2442         IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
 2443         IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
 2444 
 2445         tid = tap->txa_tid;
 2446         barctl  = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
 2447                         0 : IEEE80211_BAR_NOACK)
 2448                 | IEEE80211_BAR_COMP
 2449                 | SM(tid, IEEE80211_BAR_TID)
 2450                 ;
 2451         barseqctl = SM(seq, IEEE80211_BAR_SEQ_START);
 2452         /* NB: known to have proper alignment */
 2453         bar->i_ctl = htole16(barctl);
 2454         bar->i_seq = htole16(barseqctl);
 2455         m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
 2456 
 2457         M_WME_SETAC(m, WME_AC_VO);
 2458 
 2459         IEEE80211_NODE_STAT(ni, tx_mgmt);       /* XXX tx_ctl? */
 2460 
 2461         /* XXX locking */
 2462         /* init/bump attempts counter */
 2463         if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
 2464                 tap->txa_attempts = 1;
 2465         else
 2466                 tap->txa_attempts++;
 2467         tap->txa_seqpending = seq;
 2468         tap->txa_flags |= IEEE80211_AGGR_BARPEND;
 2469 
 2470         IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
 2471             ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
 2472             tid, barctl, seq, tap->txa_attempts);
 2473 
 2474         /*
 2475          * ic_raw_xmit will free the node reference
 2476          * regardless of queue/TX success or failure.
 2477          */
 2478         IEEE80211_TX_LOCK(ic);
 2479         ret = ieee80211_raw_output(vap, ni, m, NULL);
 2480         IEEE80211_TX_UNLOCK(ic);
 2481         if (ret != 0) {
 2482                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
 2483                     ni, "send BAR: failed: (ret = %d)\n",
 2484                     ret);
 2485                 /* xmit failed, clear state flag */
 2486                 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
 2487                 vap->iv_stats.is_ampdu_bar_tx_fail++;
 2488                 return ret;
 2489         }
 2490         /* XXX hack against tx complete happening before timer is started */
 2491         if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
 2492                 bar_start_timer(tap);
 2493         return 0;
 2494 bad:
 2495         IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
 2496             tap->txa_ni,
 2497             "%s: bad! ret=%d",
 2498             __func__, ret);
 2499         vap->iv_stats.is_ampdu_bar_tx_fail++;
 2500         ieee80211_free_node(ni);
 2501         return ret;
 2502 #undef senderr
 2503 }
 2504 
 2505 static int
 2506 ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
 2507 {
 2508         struct ieee80211_bpf_params params;
 2509 
 2510         memset(&params, 0, sizeof(params));
 2511         params.ibp_pri = WME_AC_VO;
 2512         params.ibp_rate0 = ni->ni_txparms->mgmtrate;
 2513         /* NB: we know all frames are unicast */
 2514         params.ibp_try0 = ni->ni_txparms->maxretry;
 2515         params.ibp_power = ni->ni_txpower;
 2516         return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
 2517              &params);
 2518 }
 2519 
 2520 #define ADDSHORT(frm, v) do {                   \
 2521         frm[0] = (v) & 0xff;                    \
 2522         frm[1] = (v) >> 8;                      \
 2523         frm += 2;                               \
 2524 } while (0)
 2525 
 2526 /*
 2527  * Send an action management frame.  The arguments are stuff
 2528  * into a frame without inspection; the caller is assumed to
 2529  * prepare them carefully (e.g. based on the aggregation state).
 2530  */
 2531 static int
 2532 ht_send_action_ba_addba(struct ieee80211_node *ni,
 2533         int category, int action, void *arg0)
 2534 {
 2535         struct ieee80211vap *vap = ni->ni_vap;
 2536         struct ieee80211com *ic = ni->ni_ic;
 2537         uint16_t *args = arg0;
 2538         struct mbuf *m;
 2539         uint8_t *frm;
 2540 
 2541         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2542             "send ADDBA %s: dialogtoken %d status %d "
 2543             "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
 2544             (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
 2545                 "request" : "response",
 2546             args[0], args[1], args[2], MS(args[2], IEEE80211_BAPS_TID),
 2547             args[3], args[4]);
 2548 
 2549         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2550             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2551             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2552         ieee80211_ref_node(ni);
 2553 
 2554         m = ieee80211_getmgtframe(&frm,
 2555             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2556             sizeof(uint16_t)    /* action+category */
 2557             /* XXX may action payload */
 2558             + sizeof(struct ieee80211_action_ba_addbaresponse)
 2559         );
 2560         if (m != NULL) {
 2561                 *frm++ = category;
 2562                 *frm++ = action;
 2563                 *frm++ = args[0];               /* dialog token */
 2564                 if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE)
 2565                         ADDSHORT(frm, args[1]); /* status code */
 2566                 ADDSHORT(frm, args[2]);         /* baparamset */
 2567                 ADDSHORT(frm, args[3]);         /* batimeout */
 2568                 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
 2569                         ADDSHORT(frm, args[4]); /* baseqctl */
 2570                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2571                 return ht_action_output(ni, m);
 2572         } else {
 2573                 vap->iv_stats.is_tx_nobuf++;
 2574                 ieee80211_free_node(ni);
 2575                 return ENOMEM;
 2576         }
 2577 }
 2578 
 2579 static int
 2580 ht_send_action_ba_delba(struct ieee80211_node *ni,
 2581         int category, int action, void *arg0)
 2582 {
 2583         struct ieee80211vap *vap = ni->ni_vap;
 2584         struct ieee80211com *ic = ni->ni_ic;
 2585         uint16_t *args = arg0;
 2586         struct mbuf *m;
 2587         uint16_t baparamset;
 2588         uint8_t *frm;
 2589 
 2590         baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
 2591                    | args[1]
 2592                    ;
 2593         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2594             "send DELBA action: tid %d, initiator %d reason %d (%s)",
 2595             args[0], args[1], args[2], ieee80211_reason_to_string(args[2]));
 2596 
 2597         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2598             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2599             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2600         ieee80211_ref_node(ni);
 2601 
 2602         m = ieee80211_getmgtframe(&frm,
 2603             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2604             sizeof(uint16_t)    /* action+category */
 2605             /* XXX may action payload */
 2606             + sizeof(struct ieee80211_action_ba_addbaresponse)
 2607         );
 2608         if (m != NULL) {
 2609                 *frm++ = category;
 2610                 *frm++ = action;
 2611                 ADDSHORT(frm, baparamset);
 2612                 ADDSHORT(frm, args[2]);         /* reason code */
 2613                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2614                 return ht_action_output(ni, m);
 2615         } else {
 2616                 vap->iv_stats.is_tx_nobuf++;
 2617                 ieee80211_free_node(ni);
 2618                 return ENOMEM;
 2619         }
 2620 }
 2621 
 2622 static int
 2623 ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
 2624         int category, int action, void *arg0)
 2625 {
 2626         struct ieee80211vap *vap = ni->ni_vap;
 2627         struct ieee80211com *ic = ni->ni_ic;
 2628         struct mbuf *m;
 2629         uint8_t *frm;
 2630 
 2631         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
 2632             "send HT txchwidth: width %d",
 2633             IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
 2634 
 2635         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2636             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2637             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2638         ieee80211_ref_node(ni);
 2639 
 2640         m = ieee80211_getmgtframe(&frm,
 2641             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2642             sizeof(uint16_t)    /* action+category */
 2643             /* XXX may action payload */
 2644             + sizeof(struct ieee80211_action_ba_addbaresponse)
 2645         );
 2646         if (m != NULL) {
 2647                 *frm++ = category;
 2648                 *frm++ = action;
 2649                 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 
 2650                         IEEE80211_A_HT_TXCHWIDTH_2040 :
 2651                         IEEE80211_A_HT_TXCHWIDTH_20;
 2652                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2653                 return ht_action_output(ni, m);
 2654         } else {
 2655                 vap->iv_stats.is_tx_nobuf++;
 2656                 ieee80211_free_node(ni);
 2657                 return ENOMEM;
 2658         }
 2659 }
 2660 #undef ADDSHORT
 2661 
 2662 /*
 2663  * Construct the MCS bit mask for inclusion in an HT capabilities
 2664  * information element.
 2665  */
 2666 static void
 2667 ieee80211_set_mcsset(struct ieee80211com *ic, uint8_t *frm)
 2668 {
 2669         int i;
 2670         uint8_t txparams;
 2671 
 2672         KASSERT((ic->ic_rxstream > 0 && ic->ic_rxstream <= 4),
 2673             ("ic_rxstream %d out of range", ic->ic_rxstream));
 2674         KASSERT((ic->ic_txstream > 0 && ic->ic_txstream <= 4),
 2675             ("ic_txstream %d out of range", ic->ic_txstream));
 2676 
 2677         for (i = 0; i < ic->ic_rxstream * 8; i++)
 2678                 setbit(frm, i);
 2679         if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
 2680             (ic->ic_htcaps & IEEE80211_HTC_RXMCS32))
 2681                 setbit(frm, 32);
 2682         if (ic->ic_htcaps & IEEE80211_HTC_RXUNEQUAL) {
 2683                 if (ic->ic_rxstream >= 2) {
 2684                         for (i = 33; i <= 38; i++)
 2685                                 setbit(frm, i);
 2686                 }
 2687                 if (ic->ic_rxstream >= 3) {
 2688                         for (i = 39; i <= 52; i++)
 2689                                 setbit(frm, i);
 2690                 }
 2691                 if (ic->ic_txstream >= 4) {
 2692                         for (i = 53; i <= 76; i++)
 2693                                 setbit(frm, i);
 2694                 }
 2695         }
 2696 
 2697         if (ic->ic_rxstream != ic->ic_txstream) {
 2698                 txparams = 0x1;                 /* TX MCS set defined */
 2699                 txparams |= 0x2;                /* TX RX MCS not equal */
 2700                 txparams |= (ic->ic_txstream - 1) << 2; /* num TX streams */
 2701                 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL)
 2702                         txparams |= 0x16;       /* TX unequal modulation sup */
 2703         } else
 2704                 txparams = 0;
 2705         frm[12] = txparams;
 2706 }
 2707 
 2708 /*
 2709  * Add body of an HTCAP information element.
 2710  */
 2711 static uint8_t *
 2712 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
 2713 {
 2714 #define ADDSHORT(frm, v) do {                   \
 2715         frm[0] = (v) & 0xff;                    \
 2716         frm[1] = (v) >> 8;                      \
 2717         frm += 2;                               \
 2718 } while (0)
 2719         struct ieee80211com *ic = ni->ni_ic;
 2720         struct ieee80211vap *vap = ni->ni_vap;
 2721         uint16_t caps, extcaps;
 2722         int rxmax, density;
 2723 
 2724         /* HT capabilities */
 2725         caps = vap->iv_htcaps & 0xffff;
 2726         /*
 2727          * Note channel width depends on whether we are operating as
 2728          * a sta or not.  When operating as a sta we are generating
 2729          * a request based on our desired configuration.  Otherwise
 2730          * we are operational and the channel attributes identify
 2731          * how we've been setup (which might be different if a fixed
 2732          * channel is specified).
 2733          */
 2734         if (vap->iv_opmode == IEEE80211_M_STA) {
 2735                 /* override 20/40 use based on config */
 2736                 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
 2737                         caps |= IEEE80211_HTCAP_CHWIDTH40;
 2738                 else
 2739                         caps &= ~IEEE80211_HTCAP_CHWIDTH40;
 2740 
 2741                 /* Start by using the advertised settings */
 2742                 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
 2743                 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
 2744 
 2745                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_11N,
 2746                     "%s: advertised rxmax=%d, density=%d, vap rxmax=%d, density=%d\n",
 2747                     __func__,
 2748                     rxmax,
 2749                     density,
 2750                     vap->iv_ampdu_rxmax,
 2751                     vap->iv_ampdu_density);
 2752 
 2753                 /* Cap at VAP rxmax */
 2754                 if (rxmax > vap->iv_ampdu_rxmax)
 2755                         rxmax = vap->iv_ampdu_rxmax;
 2756 
 2757                 /*
 2758                  * If the VAP ampdu density value greater, use that.
 2759                  *
 2760                  * (Larger density value == larger minimum gap between A-MPDU
 2761                  * subframes.)
 2762                  */
 2763                 if (vap->iv_ampdu_density > density)
 2764                         density = vap->iv_ampdu_density;
 2765 
 2766                 /*
 2767                  * NB: Hardware might support HT40 on some but not all
 2768                  * channels. We can't determine this earlier because only
 2769                  * after association the channel is upgraded to HT based
 2770                  * on the negotiated capabilities.
 2771                  */
 2772                 if (ni->ni_chan != IEEE80211_CHAN_ANYC &&
 2773                     findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40U) == NULL &&
 2774                     findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40D) == NULL)
 2775                         caps &= ~IEEE80211_HTCAP_CHWIDTH40;
 2776         } else {
 2777                 /* override 20/40 use based on current channel */
 2778                 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
 2779                         caps |= IEEE80211_HTCAP_CHWIDTH40;
 2780                 else
 2781                         caps &= ~IEEE80211_HTCAP_CHWIDTH40;
 2782 
 2783                 /* XXX TODO should it start by using advertised settings? */
 2784                 rxmax = vap->iv_ampdu_rxmax;
 2785                 density = vap->iv_ampdu_density;
 2786         }
 2787 
 2788         /* adjust short GI based on channel and config */
 2789         if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
 2790                 caps &= ~IEEE80211_HTCAP_SHORTGI20;
 2791         if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
 2792             (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
 2793                 caps &= ~IEEE80211_HTCAP_SHORTGI40;
 2794 
 2795         /* adjust STBC based on receive capabilities */
 2796         if ((vap->iv_flags_ht & IEEE80211_FHT_STBC_RX) == 0)
 2797                 caps &= ~IEEE80211_HTCAP_RXSTBC;
 2798 
 2799         /* XXX TODO: adjust LDPC based on receive capabilities */
 2800 
 2801         ADDSHORT(frm, caps);
 2802 
 2803         /* HT parameters */
 2804         *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
 2805              | SM(density, IEEE80211_HTCAP_MPDUDENSITY)
 2806              ;
 2807         frm++;
 2808 
 2809         /* pre-zero remainder of ie */
 2810         memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 
 2811                 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
 2812 
 2813         /* supported MCS set */
 2814         /*
 2815          * XXX: For sta mode the rate set should be restricted based
 2816          * on the AP's capabilities, but ni_htrates isn't setup when
 2817          * we're called to form an AssocReq frame so for now we're
 2818          * restricted to the device capabilities.
 2819          */
 2820         ieee80211_set_mcsset(ni->ni_ic, frm);
 2821 
 2822         frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
 2823                 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
 2824 
 2825         /* HT extended capabilities */
 2826         extcaps = vap->iv_htextcaps & 0xffff;
 2827 
 2828         ADDSHORT(frm, extcaps);
 2829 
 2830         frm += sizeof(struct ieee80211_ie_htcap) -
 2831                 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
 2832 
 2833         return frm;
 2834 #undef ADDSHORT
 2835 }
 2836 
 2837 /*
 2838  * Add 802.11n HT capabilities information element
 2839  */
 2840 uint8_t *
 2841 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
 2842 {
 2843         frm[0] = IEEE80211_ELEMID_HTCAP;
 2844         frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
 2845         return ieee80211_add_htcap_body(frm + 2, ni);
 2846 }
 2847 
 2848 /*
 2849  * Add Broadcom OUI wrapped standard HTCAP ie; this is
 2850  * used for compatibility w/ pre-draft implementations.
 2851  */
 2852 uint8_t *
 2853 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
 2854 {
 2855         frm[0] = IEEE80211_ELEMID_VENDOR;
 2856         frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
 2857         frm[2] = (BCM_OUI >> 0) & 0xff;
 2858         frm[3] = (BCM_OUI >> 8) & 0xff;
 2859         frm[4] = (BCM_OUI >> 16) & 0xff;
 2860         frm[5] = BCM_OUI_HTCAP;
 2861         return ieee80211_add_htcap_body(frm + 6, ni);
 2862 }
 2863 
 2864 /*
 2865  * Construct the MCS bit mask of basic rates
 2866  * for inclusion in an HT information element.
 2867  */
 2868 static void
 2869 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
 2870 {
 2871         int i;
 2872 
 2873         for (i = 0; i < rs->rs_nrates; i++) {
 2874                 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
 2875                 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
 2876                     r < IEEE80211_HTRATE_MAXSIZE) {
 2877                         /* NB: this assumes a particular implementation */
 2878                         setbit(frm, r);
 2879                 }
 2880         }
 2881 }
 2882 
 2883 /*
 2884  * Update the HTINFO ie for a beacon frame.
 2885  */
 2886 void
 2887 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
 2888         struct ieee80211_beacon_offsets *bo)
 2889 {
 2890 #define PROTMODE        (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
 2891         struct ieee80211_node *ni;
 2892         const struct ieee80211_channel *bsschan;
 2893         struct ieee80211com *ic = vap->iv_ic;
 2894         struct ieee80211_ie_htinfo *ht =
 2895            (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
 2896 
 2897         ni = ieee80211_ref_node(vap->iv_bss);
 2898         bsschan = ni->ni_chan;
 2899 
 2900         /* XXX only update on channel change */
 2901         ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
 2902         if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
 2903                 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
 2904         else
 2905                 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
 2906         if (IEEE80211_IS_CHAN_HT40U(bsschan))
 2907                 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
 2908         else if (IEEE80211_IS_CHAN_HT40D(bsschan))
 2909                 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
 2910         else
 2911                 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
 2912         if (IEEE80211_IS_CHAN_HT40(bsschan))
 2913                 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
 2914 
 2915         /* protection mode */
 2916         ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
 2917 
 2918         ieee80211_free_node(ni);
 2919 
 2920         /* XXX propagate to vendor ie's */
 2921 #undef PROTMODE
 2922 }
 2923 
 2924 /*
 2925  * Add body of an HTINFO information element.
 2926  *
 2927  * NB: We don't use struct ieee80211_ie_htinfo because we can
 2928  * be called to fillin both a standard ie and a compat ie that
 2929  * has a vendor OUI at the front.
 2930  */
 2931 static uint8_t *
 2932 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
 2933 {
 2934         struct ieee80211vap *vap = ni->ni_vap;
 2935         struct ieee80211com *ic = ni->ni_ic;
 2936 
 2937         /* pre-zero remainder of ie */
 2938         memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
 2939 
 2940         /* primary/control channel center */
 2941         *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
 2942 
 2943         if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
 2944                 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
 2945         else
 2946                 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
 2947         if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
 2948                 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
 2949         else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
 2950                 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
 2951         else
 2952                 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
 2953         if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
 2954                 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
 2955 
 2956         frm[1] = ic->ic_curhtprotmode;
 2957 
 2958         frm += 5;
 2959 
 2960         /* basic MCS set */
 2961         ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
 2962         frm += sizeof(struct ieee80211_ie_htinfo) -
 2963                 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
 2964         return frm;
 2965 }
 2966 
 2967 /*
 2968  * Add 802.11n HT information information element.
 2969  */
 2970 uint8_t *
 2971 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
 2972 {
 2973         frm[0] = IEEE80211_ELEMID_HTINFO;
 2974         frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
 2975         return ieee80211_add_htinfo_body(frm + 2, ni);
 2976 }
 2977 
 2978 /*
 2979  * Add Broadcom OUI wrapped standard HTINFO ie; this is
 2980  * used for compatibility w/ pre-draft implementations.
 2981  */
 2982 uint8_t *
 2983 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
 2984 {
 2985         frm[0] = IEEE80211_ELEMID_VENDOR;
 2986         frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
 2987         frm[2] = (BCM_OUI >> 0) & 0xff;
 2988         frm[3] = (BCM_OUI >> 8) & 0xff;
 2989         frm[4] = (BCM_OUI >> 16) & 0xff;
 2990         frm[5] = BCM_OUI_HTINFO;
 2991         return ieee80211_add_htinfo_body(frm + 6, ni);
 2992 }

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