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freebsd-dev/sys/net80211/ieee80211_ht.c
Adrian Chadd b94299c437 Create a new task to handle 802.11n channel width changes. 
Currently, a channel width change updates the 802.11n HT info data in
net80211 but it doesn't trigger any device changes.  So the device
driver may decide that HT40 frames can be transmitted but the last
device channel set only had HT20 set.

Now, a task is scheduled so a hardware reset or change isn't done
during any active ongoing RX. It also means that it's serialised
with the other task operations (eg channel change.)

This isn't the final incantation of this work, see below.

For now, any unmodified drivers will simply receive a channel
change log entry.  A subsequent patch to ath(4) will introduce
some basic channel change handling (by resetting the NIC.)
Other NICs may need to update their rate control information.

TODO:

* There's still a small window at the present moment where the
  channel width has been updated but the task hasn't been fired.
  The final version of this should likely pass in a channel width
  field to the driver and let the driver atomically do whatever
  it needs to before changing the channel.

PR:		kern/166286
2012-03-25 03:11:57 +00:00

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/*-
* Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD$");
#endif
/*
* IEEE 802.11n protocol support.
*/
#include "opt_inet.h"
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/endian.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/ethernet.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_action.h>
#include <net80211/ieee80211_input.h>
/* define here, used throughout file */
#define MS(_v, _f) (((_v) & _f) >> _f##_S)
#define SM(_v, _f) (((_v) << _f##_S) & _f)
const struct ieee80211_mcs_rates ieee80211_htrates[IEEE80211_HTRATE_MAXSIZE] = {
{ 13, 14, 27, 30 }, /* MCS 0 */
{ 26, 29, 54, 60 }, /* MCS 1 */
{ 39, 43, 81, 90 }, /* MCS 2 */
{ 52, 58, 108, 120 }, /* MCS 3 */
{ 78, 87, 162, 180 }, /* MCS 4 */
{ 104, 116, 216, 240 }, /* MCS 5 */
{ 117, 130, 243, 270 }, /* MCS 6 */
{ 130, 144, 270, 300 }, /* MCS 7 */
{ 26, 29, 54, 60 }, /* MCS 8 */
{ 52, 58, 108, 120 }, /* MCS 9 */
{ 78, 87, 162, 180 }, /* MCS 10 */
{ 104, 116, 216, 240 }, /* MCS 11 */
{ 156, 173, 324, 360 }, /* MCS 12 */
{ 208, 231, 432, 480 }, /* MCS 13 */
{ 234, 260, 486, 540 }, /* MCS 14 */
{ 260, 289, 540, 600 }, /* MCS 15 */
{ 39, 43, 81, 90 }, /* MCS 16 */
{ 78, 87, 162, 180 }, /* MCS 17 */
{ 117, 130, 243, 270 }, /* MCS 18 */
{ 156, 173, 324, 360 }, /* MCS 19 */
{ 234, 260, 486, 540 }, /* MCS 20 */
{ 312, 347, 648, 720 }, /* MCS 21 */
{ 351, 390, 729, 810 }, /* MCS 22 */
{ 390, 433, 810, 900 }, /* MCS 23 */
{ 52, 58, 108, 120 }, /* MCS 24 */
{ 104, 116, 216, 240 }, /* MCS 25 */
{ 156, 173, 324, 360 }, /* MCS 26 */
{ 208, 231, 432, 480 }, /* MCS 27 */
{ 312, 347, 648, 720 }, /* MCS 28 */
{ 416, 462, 864, 960 }, /* MCS 29 */
{ 468, 520, 972, 1080 }, /* MCS 30 */
{ 520, 578, 1080, 1200 }, /* MCS 31 */
{ 0, 0, 12, 13 }, /* MCS 32 */
{ 78, 87, 162, 180 }, /* MCS 33 */
{ 104, 116, 216, 240 }, /* MCS 34 */
{ 130, 144, 270, 300 }, /* MCS 35 */
{ 117, 130, 243, 270 }, /* MCS 36 */
{ 156, 173, 324, 360 }, /* MCS 37 */
{ 195, 217, 405, 450 }, /* MCS 38 */
{ 104, 116, 216, 240 }, /* MCS 39 */
{ 130, 144, 270, 300 }, /* MCS 40 */
{ 130, 144, 270, 300 }, /* MCS 41 */
{ 156, 173, 324, 360 }, /* MCS 42 */
{ 182, 202, 378, 420 }, /* MCS 43 */
{ 182, 202, 378, 420 }, /* MCS 44 */
{ 208, 231, 432, 480 }, /* MCS 45 */
{ 156, 173, 324, 360 }, /* MCS 46 */
{ 195, 217, 405, 450 }, /* MCS 47 */
{ 195, 217, 405, 450 }, /* MCS 48 */
{ 234, 260, 486, 540 }, /* MCS 49 */
{ 273, 303, 567, 630 }, /* MCS 50 */
{ 273, 303, 567, 630 }, /* MCS 51 */
{ 312, 347, 648, 720 }, /* MCS 52 */
{ 130, 144, 270, 300 }, /* MCS 53 */
{ 156, 173, 324, 360 }, /* MCS 54 */
{ 182, 202, 378, 420 }, /* MCS 55 */
{ 156, 173, 324, 360 }, /* MCS 56 */
{ 182, 202, 378, 420 }, /* MCS 57 */
{ 208, 231, 432, 480 }, /* MCS 58 */
{ 234, 260, 486, 540 }, /* MCS 59 */
{ 208, 231, 432, 480 }, /* MCS 60 */
{ 234, 260, 486, 540 }, /* MCS 61 */
{ 260, 289, 540, 600 }, /* MCS 62 */
{ 260, 289, 540, 600 }, /* MCS 63 */
{ 286, 318, 594, 660 }, /* MCS 64 */
{ 195, 217, 405, 450 }, /* MCS 65 */
{ 234, 260, 486, 540 }, /* MCS 66 */
{ 273, 303, 567, 630 }, /* MCS 67 */
{ 234, 260, 486, 540 }, /* MCS 68 */
{ 273, 303, 567, 630 }, /* MCS 69 */
{ 312, 347, 648, 720 }, /* MCS 70 */
{ 351, 390, 729, 810 }, /* MCS 71 */
{ 312, 347, 648, 720 }, /* MCS 72 */
{ 351, 390, 729, 810 }, /* MCS 73 */
{ 390, 433, 810, 900 }, /* MCS 74 */
{ 390, 433, 810, 900 }, /* MCS 75 */
{ 429, 477, 891, 990 }, /* MCS 76 */
};
#ifdef IEEE80211_AMPDU_AGE
static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */
SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW,
&ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I",
"AMPDU max reorder age (ms)");
#endif
static int ieee80211_recv_bar_ena = 1;
SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena,
0, "BAR frame processing (ena/dis)");
static int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */
SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW,
&ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
"ADDBA request timeout (ms)");
static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW,
&ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
"ADDBA request backoff (ms)");
static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLTYPE_INT | CTLFLAG_RW,
&ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
static ieee80211_recv_action_func ht_recv_action_ba_addba_request;
static ieee80211_recv_action_func ht_recv_action_ba_addba_response;
static ieee80211_recv_action_func ht_recv_action_ba_delba;
static ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave;
static ieee80211_recv_action_func ht_recv_action_ht_txchwidth;
static ieee80211_send_action_func ht_send_action_ba_addba;
static ieee80211_send_action_func ht_send_action_ba_delba;
static ieee80211_send_action_func ht_send_action_ht_txchwidth;
static void
ieee80211_ht_init(void)
{
/*
* Setup HT parameters that depends on the clock frequency.
*/
#ifdef IEEE80211_AMPDU_AGE
ieee80211_ampdu_age = msecs_to_ticks(500);
#endif
ieee80211_addba_timeout = msecs_to_ticks(250);
ieee80211_addba_backoff = msecs_to_ticks(10*1000);
ieee80211_bar_timeout = msecs_to_ticks(250);
/*
* Register action frame handlers.
*/
ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request);
ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response);
ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba);
ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave);
ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth);
ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba);
ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba);
ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba);
ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT,
IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth);
}
SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL);
static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap);
static int ieee80211_addba_request(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap,
int dialogtoken, int baparamset, int batimeout);
static int ieee80211_addba_response(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap,
int code, int baparamset, int batimeout);
static void ieee80211_addba_stop(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap);
static void null_addba_response_timeout(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap);
static void ieee80211_bar_response(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap, int status);
static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
int baparamset, int batimeout, int baseqctl);
static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
void
ieee80211_ht_attach(struct ieee80211com *ic)
{
/* setup default aggregation policy */
ic->ic_recv_action = ieee80211_recv_action;
ic->ic_send_action = ieee80211_send_action;
ic->ic_ampdu_enable = ieee80211_ampdu_enable;
ic->ic_addba_request = ieee80211_addba_request;
ic->ic_addba_response = ieee80211_addba_response;
ic->ic_addba_response_timeout = null_addba_response_timeout;
ic->ic_addba_stop = ieee80211_addba_stop;
ic->ic_bar_response = ieee80211_bar_response;
ic->ic_ampdu_rx_start = ampdu_rx_start;
ic->ic_ampdu_rx_stop = ampdu_rx_stop;
ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
}
void
ieee80211_ht_detach(struct ieee80211com *ic)
{
}
void
ieee80211_ht_vattach(struct ieee80211vap *vap)
{
/* driver can override defaults */
vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
/* tx aggregation traffic thresholds */
vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
if (vap->iv_htcaps & IEEE80211_HTC_HT) {
/*
* Device is HT capable; enable all HT-related
* facilities by default.
* XXX these choices may be too aggressive.
*/
vap->iv_flags_ht |= IEEE80211_FHT_HT
| IEEE80211_FHT_HTCOMPAT
;
if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
/* XXX infer from channel list? */
if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
}
/* enable RIFS if capable */
if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
/* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
}
/* NB: disable default legacy WDS, too many issues right now */
if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
}
void
ieee80211_ht_vdetach(struct ieee80211vap *vap)
{
}
static int
ht_getrate(struct ieee80211com *ic, int index, enum ieee80211_phymode mode,
int ratetype)
{
int mword, rate;
mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode);
if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
return (0);
switch (ratetype) {
case 0:
rate = ieee80211_htrates[index].ht20_rate_800ns;
break;
case 1:
rate = ieee80211_htrates[index].ht20_rate_400ns;
break;
case 2:
rate = ieee80211_htrates[index].ht40_rate_800ns;
break;
default:
rate = ieee80211_htrates[index].ht40_rate_400ns;
break;
}
return (rate);
}
static struct printranges {
int minmcs;
int maxmcs;
int txstream;
int ratetype;
int htcapflags;
} ranges[] = {
{ 0, 7, 1, 0, 0 },
{ 8, 15, 2, 0, 0 },
{ 16, 23, 3, 0, 0 },
{ 24, 31, 4, 0, 0 },
{ 32, 0, 1, 2, IEEE80211_HTC_TXMCS32 },
{ 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL },
{ 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL },
{ 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL },
{ 0, 0, 0, 0, 0 },
};
static void
ht_rateprint(struct ieee80211com *ic, enum ieee80211_phymode mode, int ratetype)
{
struct ifnet *ifp = ic->ic_ifp;
int minrate, maxrate;
struct printranges *range;
for (range = ranges; range->txstream != 0; range++) {
if (ic->ic_txstream < range->txstream)
continue;
if (range->htcapflags &&
(ic->ic_htcaps & range->htcapflags) == 0)
continue;
if (ratetype < range->ratetype)
continue;
minrate = ht_getrate(ic, range->minmcs, mode, ratetype);
maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype);
if (range->maxmcs) {
if_printf(ifp, "MCS %d-%d: %d%sMbps - %d%sMbps\n",
range->minmcs, range->maxmcs,
minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""),
maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : ""));
} else {
if_printf(ifp, "MCS %d: %d%sMbps\n", range->minmcs,
minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""));
}
}
}
static void
ht_announce(struct ieee80211com *ic, enum ieee80211_phymode mode)
{
struct ifnet *ifp = ic->ic_ifp;
const char *modestr = ieee80211_phymode_name[mode];
if_printf(ifp, "%s MCS 20MHz\n", modestr);
ht_rateprint(ic, mode, 0);
if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) {
if_printf(ifp, "%s MCS 20MHz SGI\n", modestr);
ht_rateprint(ic, mode, 1);
}
if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
if_printf(ifp, "%s MCS 40MHz:\n", modestr);
ht_rateprint(ic, mode, 2);
}
if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
(ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) {
if_printf(ifp, "%s MCS 40MHz SGI:\n", modestr);
ht_rateprint(ic, mode, 3);
}
}
void
ieee80211_ht_announce(struct ieee80211com *ic)
{
struct ifnet *ifp = ic->ic_ifp;
if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
if_printf(ifp, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream);
if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
ht_announce(ic, IEEE80211_MODE_11NA);
if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
ht_announce(ic, IEEE80211_MODE_11NG);
}
static struct ieee80211_htrateset htrateset;
const struct ieee80211_htrateset *
ieee80211_get_suphtrates(struct ieee80211com *ic,
const struct ieee80211_channel *c)
{
#define ADDRATE(x) do { \
htrateset.rs_rates[htrateset.rs_nrates] = x; \
htrateset.rs_nrates++; \
} while (0)
int i;
memset(&htrateset, 0, sizeof(struct ieee80211_htrateset));
for (i = 0; i < ic->ic_txstream * 8; i++)
ADDRATE(i);
if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
(ic->ic_htcaps & IEEE80211_HTC_TXMCS32))
ADDRATE(32);
if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
if (ic->ic_txstream >= 2) {
for (i = 33; i <= 38; i++)
ADDRATE(i);
}
if (ic->ic_txstream >= 3) {
for (i = 39; i <= 52; i++)
ADDRATE(i);
}
if (ic->ic_txstream == 4) {
for (i = 53; i <= 76; i++)
ADDRATE(i);
}
}
return &htrateset;
#undef ADDRATE
}
/*
* Receive processing.
*/
/*
* Decap the encapsulated A-MSDU frames and dispatch all but
* the last for delivery. The last frame is returned for
* delivery via the normal path.
*/
struct mbuf *
ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
{
struct ieee80211vap *vap = ni->ni_vap;
int framelen;
struct mbuf *n;
/* discard 802.3 header inserted by ieee80211_decap */
m_adj(m, sizeof(struct ether_header));
vap->iv_stats.is_amsdu_decap++;
for (;;) {
/*
* Decap the first frame, bust it apart from the
* remainder and deliver. We leave the last frame
* delivery to the caller (for consistency with other
* code paths, could also do it here).
*/
m = ieee80211_decap1(m, &framelen);
if (m == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "a-msdu", "%s", "decap failed");
vap->iv_stats.is_amsdu_tooshort++;
return NULL;
}
if (m->m_pkthdr.len == framelen)
break;
n = m_split(m, framelen, M_NOWAIT);
if (n == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "a-msdu",
"%s", "unable to split encapsulated frames");
vap->iv_stats.is_amsdu_split++;
m_freem(m); /* NB: must reclaim */
return NULL;
}
vap->iv_deliver_data(vap, ni, m);
/*
* Remove frame contents; each intermediate frame
* is required to be aligned to a 4-byte boundary.
*/
m = n;
m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
}
return m; /* last delivered by caller */
}
/*
* Purge all frames in the A-MPDU re-order queue.
*/
static void
ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
{
struct mbuf *m;
int i;
for (i = 0; i < rap->rxa_wnd; i++) {
m = rap->rxa_m[i];
if (m != NULL) {
rap->rxa_m[i] = NULL;
rap->rxa_qbytes -= m->m_pkthdr.len;
m_freem(m);
if (--rap->rxa_qframes == 0)
break;
}
}
KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
("lost %u data, %u frames on ampdu rx q",
rap->rxa_qbytes, rap->rxa_qframes));
}
/*
* Start A-MPDU rx/re-order processing for the specified TID.
*/
static int
ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
int baparamset, int batimeout, int baseqctl)
{
int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
/*
* AMPDU previously setup and not terminated with a DELBA,
* flush the reorder q's in case anything remains.
*/
ampdu_rx_purge(rap);
}
memset(rap, 0, sizeof(*rap));
rap->rxa_wnd = (bufsiz == 0) ?
IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START);
rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
return 0;
}
/*
* Stop A-MPDU rx processing for the specified TID.
*/
static void
ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
{
ampdu_rx_purge(rap);
rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
}
/*
* Dispatch a frame from the A-MPDU reorder queue. The
* frame is fed back into ieee80211_input marked with an
* M_AMPDU_MPDU flag so it doesn't come back to us (it also
* permits ieee80211_input to optimize re-processing).
*/
static __inline void
ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
{
m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */
/* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
(void) ieee80211_input(ni, m, 0, 0);
}
/*
* Dispatch as many frames as possible from the re-order queue.
* Frames will always be "at the front"; we process all frames
* up to the first empty slot in the window. On completion we
* cleanup state if there are still pending frames in the current
* BA window. We assume the frame at slot 0 is already handled
* by the caller; we always start at slot 1.
*/
static void
ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
struct mbuf *m;
int i;
/* flush run of frames */
for (i = 1; i < rap->rxa_wnd; i++) {
m = rap->rxa_m[i];
if (m == NULL)
break;
rap->rxa_m[i] = NULL;
rap->rxa_qbytes -= m->m_pkthdr.len;
rap->rxa_qframes--;
ampdu_dispatch(ni, m);
}
/*
* If frames remain, copy the mbuf pointers down so
* they correspond to the offsets in the new window.
*/
if (rap->rxa_qframes != 0) {
int n = rap->rxa_qframes, j;
for (j = i+1; j < rap->rxa_wnd; j++) {
if (rap->rxa_m[j] != NULL) {
rap->rxa_m[j-i] = rap->rxa_m[j];
rap->rxa_m[j] = NULL;
if (--n == 0)
break;
}
}
KASSERT(n == 0, ("lost %d frames", n));
vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
}
/*
* Adjust the start of the BA window to
* reflect the frames just dispatched.
*/
rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
vap->iv_stats.is_ampdu_rx_oor += i;
}
#ifdef IEEE80211_AMPDU_AGE
/*
* Dispatch all frames in the A-MPDU re-order queue.
*/
static void
ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
{
struct ieee80211vap *vap = ni->ni_vap;
struct mbuf *m;
int i;
for (i = 0; i < rap->rxa_wnd; i++) {
m = rap->rxa_m[i];
if (m == NULL)
continue;
rap->rxa_m[i] = NULL;
rap->rxa_qbytes -= m->m_pkthdr.len;
rap->rxa_qframes--;
vap->iv_stats.is_ampdu_rx_oor++;
ampdu_dispatch(ni, m);
if (rap->rxa_qframes == 0)
break;
}
}
#endif /* IEEE80211_AMPDU_AGE */
/*
* Dispatch all frames in the A-MPDU re-order queue
* preceding the specified sequence number. This logic
* handles window moves due to a received MSDU or BAR.
*/
static void
ampdu_rx_flush_upto(struct ieee80211_node *ni,
struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
{
struct ieee80211vap *vap = ni->ni_vap;
struct mbuf *m;
ieee80211_seq seqno;
int i;
/*
* Flush any complete MSDU's with a sequence number lower
* than winstart. Gaps may exist. Note that we may actually
* dispatch frames past winstart if a run continues; this is
* an optimization that avoids having to do a separate pass
* to dispatch frames after moving the BA window start.
*/
seqno = rap->rxa_start;
for (i = 0; i < rap->rxa_wnd; i++) {
m = rap->rxa_m[i];
if (m != NULL) {
rap->rxa_m[i] = NULL;
rap->rxa_qbytes -= m->m_pkthdr.len;
rap->rxa_qframes--;
vap->iv_stats.is_ampdu_rx_oor++;
ampdu_dispatch(ni, m);
} else {
if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
break;
}
seqno = IEEE80211_SEQ_INC(seqno);
}
/*
* If frames remain, copy the mbuf pointers down so
* they correspond to the offsets in the new window.
*/
if (rap->rxa_qframes != 0) {
int n = rap->rxa_qframes, j;
/* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
KASSERT(rap->rxa_m[0] == NULL,
("%s: BA window slot 0 occupied", __func__));
for (j = i+1; j < rap->rxa_wnd; j++) {
if (rap->rxa_m[j] != NULL) {
rap->rxa_m[j-i] = rap->rxa_m[j];
rap->rxa_m[j] = NULL;
if (--n == 0)
break;
}
}
KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
"BA win <%d:%d> winstart %d",
__func__, n, rap->rxa_qframes, i, rap->rxa_start,
IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
winstart));
vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
}
/*
* Move the start of the BA window; we use the
* sequence number of the last MSDU that was
* passed up the stack+1 or winstart if stopped on
* a gap in the reorder buffer.
*/
rap->rxa_start = seqno;
}
/*
* Process a received QoS data frame for an HT station. Handle
* A-MPDU reordering: if this frame is received out of order
* and falls within the BA window hold onto it. Otherwise if
* this frame completes a run, flush any pending frames. We
* return 1 if the frame is consumed. A 0 is returned if
* the frame should be processed normally by the caller.
*/
int
ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
{
#define IEEE80211_FC0_QOSDATA \
(IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
#define PROCESS 0 /* caller should process frame */
#define CONSUMED 1 /* frame consumed, caller does nothing */
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_qosframe *wh;
struct ieee80211_rx_ampdu *rap;
ieee80211_seq rxseq;
uint8_t tid;
int off;
KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
/* NB: m_len known to be sufficient */
wh = mtod(m, struct ieee80211_qosframe *);
if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
/*
* Not QoS data, shouldn't get here but just
* return it to the caller for processing.
*/
return PROCESS;
}
if (IEEE80211_IS_DSTODS(wh))
tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
else
tid = wh->i_qos[0];
tid &= IEEE80211_QOS_TID;
rap = &ni->ni_rx_ampdu[tid];
if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
/*
* No ADDBA request yet, don't touch.
*/
return PROCESS;
}
rxseq = le16toh(*(uint16_t *)wh->i_seq);
if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
/*
* Fragments are not allowed; toss.
*/
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
"A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
vap->iv_stats.is_ampdu_rx_drop++;
IEEE80211_NODE_STAT(ni, rx_drop);
m_freem(m);
return CONSUMED;
}
rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
rap->rxa_nframes++;
again:
if (rxseq == rap->rxa_start) {
/*
* First frame in window.
*/
if (rap->rxa_qframes != 0) {
/*
* Dispatch as many packets as we can.
*/
KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
ampdu_dispatch(ni, m);
ampdu_rx_dispatch(rap, ni);
return CONSUMED;
} else {
/*
* In order; advance window and notify
* caller to dispatch directly.
*/
rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
return PROCESS;
}
}
/*
* Frame is out of order; store if in the BA window.
*/
/* calculate offset in BA window */
off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
if (off < rap->rxa_wnd) {
/*
* Common case (hopefully): in the BA window.
* Sec 9.10.7.6.2 a) (p.137)
*/
#ifdef IEEE80211_AMPDU_AGE
/*
* Check for frames sitting too long in the reorder queue.
* This should only ever happen if frames are not delivered
* without the sender otherwise notifying us (e.g. with a
* BAR to move the window). Typically this happens because
* of vendor bugs that cause the sequence number to jump.
* When this happens we get a gap in the reorder queue that
* leaves frame sitting on the queue until they get pushed
* out due to window moves. When the vendor does not send
* BAR this move only happens due to explicit packet sends
*
* NB: we only track the time of the oldest frame in the
* reorder q; this means that if we flush we might push
* frames that still "new"; if this happens then subsequent
* frames will result in BA window moves which cost something
* but is still better than a big throughput dip.
*/
if (rap->rxa_qframes != 0) {
/* XXX honor batimeout? */
if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
/*
* Too long since we received the first
* frame; flush the reorder buffer.
*/
if (rap->rxa_qframes != 0) {
vap->iv_stats.is_ampdu_rx_age +=
rap->rxa_qframes;
ampdu_rx_flush(ni, rap);
}
rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
return PROCESS;
}
} else {
/*
* First frame, start aging timer.
*/
rap->rxa_age = ticks;
}
#endif /* IEEE80211_AMPDU_AGE */
/* save packet */
if (rap->rxa_m[off] == NULL) {
rap->rxa_m[off] = m;
rap->rxa_qframes++;
rap->rxa_qbytes += m->m_pkthdr.len;
vap->iv_stats.is_ampdu_rx_reorder++;
} else {
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
ni->ni_macaddr, "a-mpdu duplicate",
"seqno %u tid %u BA win <%u:%u>",
rxseq, tid, rap->rxa_start,
IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
vap->iv_stats.is_rx_dup++;
IEEE80211_NODE_STAT(ni, rx_dup);
m_freem(m);
}
return CONSUMED;
}
if (off < IEEE80211_SEQ_BA_RANGE) {
/*
* Outside the BA window, but within range;
* flush the reorder q and move the window.
* Sec 9.10.7.6.2 b) (p.138)
*/
IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
"move BA win <%u:%u> (%u frames) rxseq %u tid %u",
rap->rxa_start,
IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
rap->rxa_qframes, rxseq, tid);
vap->iv_stats.is_ampdu_rx_move++;
/*
* The spec says to flush frames up to but not including:
* WinStart_B = rxseq - rap->rxa_wnd + 1
* Then insert the frame or notify the caller to process
* it immediately. We can safely do this by just starting
* over again because we know the frame will now be within
* the BA window.
*/
/* NB: rxa_wnd known to be >0 */
ampdu_rx_flush_upto(ni, rap,
IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
goto again;
} else {
/*
* Outside the BA window and out of range; toss.
* Sec 9.10.7.6.2 c) (p.138)
*/
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
"MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
rap->rxa_start,
IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
rap->rxa_qframes, rxseq, tid,
wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
vap->iv_stats.is_ampdu_rx_drop++;
IEEE80211_NODE_STAT(ni, rx_drop);
m_freem(m);
return CONSUMED;
}
#undef CONSUMED
#undef PROCESS
#undef IEEE80211_FC0_QOSDATA
}
/*
* Process a BAR ctl frame. Dispatch all frames up to
* the sequence number of the frame. If this frame is
* out of range it's discarded.
*/
void
ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_frame_bar *wh;
struct ieee80211_rx_ampdu *rap;
ieee80211_seq rxseq;
int tid, off;
if (!ieee80211_recv_bar_ena) {
#if 0
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
ni->ni_macaddr, "BAR", "%s", "processing disabled");
#endif
vap->iv_stats.is_ampdu_bar_bad++;
return;
}
wh = mtod(m0, struct ieee80211_frame_bar *);
/* XXX check basic BAR */
tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
rap = &ni->ni_rx_ampdu[tid];
if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
/*
* No ADDBA request yet, don't touch.
*/
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
vap->iv_stats.is_ampdu_bar_bad++;
return;
}
vap->iv_stats.is_ampdu_bar_rx++;
rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
if (rxseq == rap->rxa_start)
return;
/* calculate offset in BA window */
off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
if (off < IEEE80211_SEQ_BA_RANGE) {
/*
* Flush the reorder q up to rxseq and move the window.
* Sec 9.10.7.6.3 a) (p.138)
*/
IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
"BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
rap->rxa_start,
IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
rap->rxa_qframes, rxseq, tid);
vap->iv_stats.is_ampdu_bar_move++;
ampdu_rx_flush_upto(ni, rap, rxseq);
if (off >= rap->rxa_wnd) {
/*
* BAR specifies a window start to the right of BA
* window; we must move it explicitly since
* ampdu_rx_flush_upto will not.
*/
rap->rxa_start = rxseq;
}
} else {
/*
* Out of range; toss.
* Sec 9.10.7.6.3 b) (p.138)
*/
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
"BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
rap->rxa_start,
IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
rap->rxa_qframes, rxseq, tid,
wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
vap->iv_stats.is_ampdu_bar_oow++;
IEEE80211_NODE_STAT(ni, rx_drop);
}
}
/*
* Setup HT-specific state in a node. Called only
* when HT use is negotiated so we don't do extra
* work for temporary and/or legacy sta's.
*/
void
ieee80211_ht_node_init(struct ieee80211_node *ni)
{
struct ieee80211_tx_ampdu *tap;
int ac;
if (ni->ni_flags & IEEE80211_NODE_HT) {
/*
* Clean AMPDU state on re-associate. This handles the case
* where a station leaves w/o notifying us and then returns
* before node is reaped for inactivity.
*/
ieee80211_ht_node_cleanup(ni);
}
for (ac = 0; ac < WME_NUM_AC; ac++) {
tap = &ni->ni_tx_ampdu[ac];
tap->txa_ac = ac;
tap->txa_ni = ni;
/* NB: further initialization deferred */
}
ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
}
/*
* Cleanup HT-specific state in a node. Called only
* when HT use has been marked.
*/
void
ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
int i;
KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
/* XXX optimize this */
for (i = 0; i < WME_NUM_AC; i++) {
struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
if (tap->txa_flags & IEEE80211_AGGR_SETUP)
ampdu_tx_stop(tap);
}
for (i = 0; i < WME_NUM_TID; i++)
ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
ni->ni_htcap = 0;
ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
}
/*
* Age out HT resources for a station.
*/
void
ieee80211_ht_node_age(struct ieee80211_node *ni)
{
#ifdef IEEE80211_AMPDU_AGE
struct ieee80211vap *vap = ni->ni_vap;
uint8_t tid;
#endif
KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
#ifdef IEEE80211_AMPDU_AGE
for (tid = 0; tid < WME_NUM_TID; tid++) {
struct ieee80211_rx_ampdu *rap;
rap = &ni->ni_rx_ampdu[tid];
if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
continue;
if (rap->rxa_qframes == 0)
continue;
/*
* Check for frames sitting too long in the reorder queue.
* See above for more details on what's happening here.
*/
/* XXX honor batimeout? */
if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
/*
* Too long since we received the first
* frame; flush the reorder buffer.
*/
vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
ampdu_rx_flush(ni, rap);
}
}
#endif /* IEEE80211_AMPDU_AGE */
}
static struct ieee80211_channel *
findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
{
return ieee80211_find_channel(ic, c->ic_freq,
(c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
}
/*
* Adjust a channel to be HT/non-HT according to the vap's configuration.
*/
struct ieee80211_channel *
ieee80211_ht_adjust_channel(struct ieee80211com *ic,
struct ieee80211_channel *chan, int flags)
{
struct ieee80211_channel *c;
if (flags & IEEE80211_FHT_HT) {
/* promote to HT if possible */
if (flags & IEEE80211_FHT_USEHT40) {
if (!IEEE80211_IS_CHAN_HT40(chan)) {
/* NB: arbitrarily pick ht40+ over ht40- */
c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
if (c == NULL)
c = findhtchan(ic, chan,
IEEE80211_CHAN_HT40D);
if (c == NULL)
c = findhtchan(ic, chan,
IEEE80211_CHAN_HT20);
if (c != NULL)
chan = c;
}
} else if (!IEEE80211_IS_CHAN_HT20(chan)) {
c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
if (c != NULL)
chan = c;
}
} else if (IEEE80211_IS_CHAN_HT(chan)) {
/* demote to legacy, HT use is disabled */
c = ieee80211_find_channel(ic, chan->ic_freq,
chan->ic_flags &~ IEEE80211_CHAN_HT);
if (c != NULL)
chan = c;
}
return chan;
}
/*
* Setup HT-specific state for a legacy WDS peer.
*/
void
ieee80211_ht_wds_init(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_tx_ampdu *tap;
int ac;
KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
/* XXX check scan cache in case peer has an ap and we have info */
/*
* If setup with a legacy channel; locate an HT channel.
* Otherwise if the inherited channel (from a companion
* AP) is suitable use it so we use the same location
* for the extension channel).
*/
ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
ni->ni_htcap = 0;
if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
ni->ni_chw = 40;
if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
} else {
ni->ni_chw = 20;
ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
}
ni->ni_htctlchan = ni->ni_chan->ic_ieee;
if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
ni->ni_flags |= IEEE80211_NODE_RIFS;
/* XXX does it make sense to enable SMPS? */
ni->ni_htopmode = 0; /* XXX need protection state */
ni->ni_htstbc = 0; /* XXX need info */
for (ac = 0; ac < WME_NUM_AC; ac++) {
tap = &ni->ni_tx_ampdu[ac];
tap->txa_ac = ac;
}
/* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
}
/*
* Notify hostap vaps of a change in the HTINFO ie.
*/
static void
htinfo_notify(struct ieee80211com *ic)
{
struct ieee80211vap *vap;
int first = 1;
IEEE80211_LOCK_ASSERT(ic);
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
if (vap->iv_opmode != IEEE80211_M_HOSTAP)
continue;
if (vap->iv_state != IEEE80211_S_RUN ||
!IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
continue;
if (first) {
IEEE80211_NOTE(vap,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
vap->iv_bss,
"HT bss occupancy change: %d sta, %d ht, "
"%d ht40%s, HT protmode now 0x%x"
, ic->ic_sta_assoc
, ic->ic_ht_sta_assoc
, ic->ic_ht40_sta_assoc
, (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ?
", non-HT sta present" : ""
, ic->ic_curhtprotmode);
first = 0;
}
ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
}
}
/*
* Calculate HT protection mode from current
* state and handle updates.
*/
static void
htinfo_update(struct ieee80211com *ic)
{
uint8_t protmode;
if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
protmode = IEEE80211_HTINFO_OPMODE_MIXED
| IEEE80211_HTINFO_NONHT_PRESENT;
} else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) {
protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
| IEEE80211_HTINFO_NONHT_PRESENT;
} else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
} else {
protmode = IEEE80211_HTINFO_OPMODE_PURE;
}
if (protmode != ic->ic_curhtprotmode) {
ic->ic_curhtprotmode = protmode;
htinfo_notify(ic);
}
}
/*
* Handle an HT station joining a BSS.
*/
void
ieee80211_ht_node_join(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
IEEE80211_LOCK_ASSERT(ic);
if (ni->ni_flags & IEEE80211_NODE_HT) {
ic->ic_ht_sta_assoc++;
if (ni->ni_chw == 40)
ic->ic_ht40_sta_assoc++;
}
htinfo_update(ic);
}
/*
* Handle an HT station leaving a BSS.
*/
void
ieee80211_ht_node_leave(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
IEEE80211_LOCK_ASSERT(ic);
if (ni->ni_flags & IEEE80211_NODE_HT) {
ic->ic_ht_sta_assoc--;
if (ni->ni_chw == 40)
ic->ic_ht40_sta_assoc--;
}
htinfo_update(ic);
}
/*
* Public version of htinfo_update; used for processing
* beacon frames from overlapping bss.
*
* Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
* (on receipt of a beacon that advertises MIXED) or
* IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
* from an overlapping legacy bss). We treat MIXED with
* a higher precedence than PROTOPT (i.e. we will not change
* change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
* corresponds to how we handle things in htinfo_update.
*/
void
ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
{
#define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE)
IEEE80211_LOCK(ic);
/* track non-HT station presence */
KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
("protmode 0x%x", protmode));
ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
ic->ic_lastnonht = ticks;
if (protmode != ic->ic_curhtprotmode &&
(OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
/* push beacon update */
ic->ic_curhtprotmode = protmode;
htinfo_notify(ic);
}
IEEE80211_UNLOCK(ic);
#undef OPMODE
}
/*
* Time out presence of an overlapping bss with non-HT
* stations. When operating in hostap mode we listen for
* beacons from other stations and if we identify a non-HT
* station is present we update the opmode field of the
* HTINFO ie. To identify when all non-HT stations are
* gone we time out this condition.
*/
void
ieee80211_ht_timeout(struct ieee80211com *ic)
{
IEEE80211_LOCK_ASSERT(ic);
if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) &&
time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
#if 0
IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
"%s", "time out non-HT STA present on channel");
#endif
ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
htinfo_update(ic);
}
}
/* unalligned little endian access */
#define LE_READ_2(p) \
((uint16_t) \
((((const uint8_t *)(p))[0] ) | \
(((const uint8_t *)(p))[1] << 8)))
/*
* Process an 802.11n HT capabilities ie.
*/
void
ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
{
if (ie[0] == IEEE80211_ELEMID_VENDOR) {
/*
* Station used Vendor OUI ie to associate;
* mark the node so when we respond we'll use
* the Vendor OUI's and not the standard ie's.
*/
ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
ie += 4;
} else
ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
ni->ni_htcap = LE_READ_2(ie +
__offsetof(struct ieee80211_ie_htcap, hc_cap));
ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
}
static void
htinfo_parse(struct ieee80211_node *ni,
const struct ieee80211_ie_htinfo *htinfo)
{
uint16_t w;
ni->ni_htctlchan = htinfo->hi_ctrlchannel;
ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
w = LE_READ_2(&htinfo->hi_byte2);
ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
w = LE_READ_2(&htinfo->hi_byte45);
ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
}
/*
* Parse an 802.11n HT info ie and save useful information
* to the node state. Note this does not effect any state
* changes such as for channel width change.
*/
void
ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
{
if (ie[0] == IEEE80211_ELEMID_VENDOR)
ie += 4;
htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
}
/*
* Handle 11n channel switch. Use the received HT ie's to
* identify the right channel to use. If we cannot locate it
* in the channel table then fallback to legacy operation.
* Note that we use this information to identify the node's
* channel only; the caller is responsible for insuring any
* required channel change is done (e.g. in sta mode when
* parsing the contents of a beacon frame).
*/
static int
htinfo_update_chw(struct ieee80211_node *ni, int htflags)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_channel *c;
int chanflags;
int ret = 0;
chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
if (chanflags != ni->ni_chan->ic_flags) {
/* XXX not right for ht40- */
c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
/*
* No HT40 channel entry in our table; fall back
* to HT20 operation. This should not happen.
*/
c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
#if 0
IEEE80211_NOTE(ni->ni_vap,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
"no HT40 channel (freq %u), falling back to HT20",
ni->ni_chan->ic_freq);
#endif
/* XXX stat */
}
if (c != NULL && c != ni->ni_chan) {
IEEE80211_NOTE(ni->ni_vap,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
"switch station to HT%d channel %u/0x%x",
IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
c->ic_freq, c->ic_flags);
ni->ni_chan = c;
ret = 1;
}
/* NB: caller responsible for forcing any channel change */
}
/* update node's tx channel width */
ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
return (ret);
}
/*
* Update 11n MIMO PS state according to received htcap.
*/
static __inline int
htcap_update_mimo_ps(struct ieee80211_node *ni)
{
uint16_t oflags = ni->ni_flags;
switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
case IEEE80211_HTCAP_SMPS_DYNAMIC:
ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
break;
case IEEE80211_HTCAP_SMPS_ENA:
ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
break;
case IEEE80211_HTCAP_SMPS_OFF:
default: /* disable on rx of reserved value */
ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
break;
}
return (oflags ^ ni->ni_flags);
}
/*
* Update short GI state according to received htcap
* and local settings.
*/
static __inline void
htcap_update_shortgi(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
(vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
ni->ni_flags |= IEEE80211_NODE_SGI20;
if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
(vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
ni->ni_flags |= IEEE80211_NODE_SGI40;
}
/*
* Parse and update HT-related state extracted from
* the HT cap and info ie's.
*/
int
ieee80211_ht_updateparams(struct ieee80211_node *ni,
const uint8_t *htcapie, const uint8_t *htinfoie)
{
struct ieee80211vap *vap = ni->ni_vap;
const struct ieee80211_ie_htinfo *htinfo;
int htflags;
int ret = 0;
ieee80211_parse_htcap(ni, htcapie);
if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
htcap_update_mimo_ps(ni);
htcap_update_shortgi(ni);
if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
htinfoie += 4;
htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
htinfo_parse(ni, htinfo);
htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
IEEE80211_CHAN_HT20 : 0;
/* NB: honor operating mode constraint */
if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
(vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
htflags = IEEE80211_CHAN_HT40U;
else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
htflags = IEEE80211_CHAN_HT40D;
}
if (htinfo_update_chw(ni, htflags))
ret = 1;
if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
(vap->iv_flags_ht & IEEE80211_FHT_RIFS))
ni->ni_flags |= IEEE80211_NODE_RIFS;
else
ni->ni_flags &= ~IEEE80211_NODE_RIFS;
return (ret);
}
/*
* Parse and update HT-related state extracted from the HT cap ie
* for a station joining an HT BSS.
*/
void
ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
{
struct ieee80211vap *vap = ni->ni_vap;
int htflags;
ieee80211_parse_htcap(ni, htcapie);
if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
htcap_update_mimo_ps(ni);
htcap_update_shortgi(ni);
/* NB: honor operating mode constraint */
/* XXX 40 MHz intolerant */
htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
IEEE80211_CHAN_HT20 : 0;
if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
(vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
htflags = IEEE80211_CHAN_HT40U;
else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
htflags = IEEE80211_CHAN_HT40D;
}
(void) htinfo_update_chw(ni, htflags);
}
/*
* Install received HT rate set by parsing the HT cap ie.
*/
int
ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
const struct ieee80211_ie_htcap *htcap;
struct ieee80211_htrateset *rs;
int i, maxequalmcs, maxunequalmcs;
maxequalmcs = ic->ic_txstream * 8 - 1;
if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
if (ic->ic_txstream >= 2)
maxunequalmcs = 38;
if (ic->ic_txstream >= 3)
maxunequalmcs = 52;
if (ic->ic_txstream >= 4)
maxunequalmcs = 76;
} else
maxunequalmcs = 0;
rs = &ni->ni_htrates;
memset(rs, 0, sizeof(*rs));
if (ie != NULL) {
if (ie[0] == IEEE80211_ELEMID_VENDOR)
ie += 4;
htcap = (const struct ieee80211_ie_htcap *) ie;
for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
if (isclr(htcap->hc_mcsset, i))
continue;
if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
IEEE80211_NOTE(vap,
IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
"WARNING, HT rate set too large; only "
"using %u rates", IEEE80211_HTRATE_MAXSIZE);
vap->iv_stats.is_rx_rstoobig++;
break;
}
if (i <= 31 && i > maxequalmcs)
continue;
if (i == 32 &&
(ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0)
continue;
if (i > 32 && i > maxunequalmcs)
continue;
rs->rs_rates[rs->rs_nrates++] = i;
}
}
return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
}
/*
* Mark rates in a node's HT rate set as basic according
* to the information in the supplied HT info ie.
*/
void
ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
{
const struct ieee80211_ie_htinfo *htinfo;
struct ieee80211_htrateset *rs;
int i, j;
if (ie[0] == IEEE80211_ELEMID_VENDOR)
ie += 4;
htinfo = (const struct ieee80211_ie_htinfo *) ie;
rs = &ni->ni_htrates;
if (rs->rs_nrates == 0) {
IEEE80211_NOTE(ni->ni_vap,
IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
"%s", "WARNING, empty HT rate set");
return;
}
for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
if (isclr(htinfo->hi_basicmcsset, i))
continue;
for (j = 0; j < rs->rs_nrates; j++)
if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
}
}
static void
ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
{
callout_init(&tap->txa_timer, CALLOUT_MPSAFE);
tap->txa_flags |= IEEE80211_AGGR_SETUP;
}
static void
ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
{
struct ieee80211_node *ni = tap->txa_ni;
struct ieee80211com *ic = ni->ni_ic;
KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
("txa_flags 0x%x ac %d", tap->txa_flags, tap->txa_ac));
/*
* Stop BA stream if setup so driver has a chance
* to reclaim any resources it might have allocated.
*/
ic->ic_addba_stop(ni, tap);
/*
* Stop any pending BAR transmit.
*/
bar_stop_timer(tap);
tap->txa_lastsample = 0;
tap->txa_avgpps = 0;
/* NB: clearing NAK means we may re-send ADDBA */
tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
}
/*
* ADDBA response timeout.
*
* If software aggregation and per-TID queue management was done here,
* that queue would be unpaused after the ADDBA timeout occurs.
*/
static void
addba_timeout(void *arg)
{
struct ieee80211_tx_ampdu *tap = arg;
struct ieee80211_node *ni = tap->txa_ni;
struct ieee80211com *ic = ni->ni_ic;
/* XXX ? */
tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
tap->txa_attempts++;
ic->ic_addba_response_timeout(ni, tap);
}
static void
addba_start_timeout(struct ieee80211_tx_ampdu *tap)
{
/* XXX use CALLOUT_PENDING instead? */
callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
addba_timeout, tap);
tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
}
static void
addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
{
/* XXX use CALLOUT_PENDING instead? */
if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
callout_stop(&tap->txa_timer);
tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
}
}
static void
null_addba_response_timeout(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap)
{
}
/*
* Default method for requesting A-MPDU tx aggregation.
* We setup the specified state block and start a timer
* to wait for an ADDBA response frame.
*/
static int
ieee80211_addba_request(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap,
int dialogtoken, int baparamset, int batimeout)
{
int bufsiz;
/* XXX locking */
tap->txa_token = dialogtoken;
tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
tap->txa_wnd = (bufsiz == 0) ?
IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
addba_start_timeout(tap);
return 1;
}
/*
* Default method for processing an A-MPDU tx aggregation
* response. We shutdown any pending timer and update the
* state block according to the reply.
*/
static int
ieee80211_addba_response(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap,
int status, int baparamset, int batimeout)
{
int bufsiz, tid;
/* XXX locking */
addba_stop_timeout(tap);
if (status == IEEE80211_STATUS_SUCCESS) {
bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
/* XXX override our request? */
tap->txa_wnd = (bufsiz == 0) ?
IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
/* XXX AC/TID */
tid = MS(baparamset, IEEE80211_BAPS_TID);
tap->txa_flags |= IEEE80211_AGGR_RUNNING;
tap->txa_attempts = 0;
} else {
/* mark tid so we don't try again */
tap->txa_flags |= IEEE80211_AGGR_NAK;
}
return 1;
}
/*
* Default method for stopping A-MPDU tx aggregation.
* Any timer is cleared and we drain any pending frames.
*/
static void
ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
{
/* XXX locking */
addba_stop_timeout(tap);
if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
/* XXX clear aggregation queue */
tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
}
tap->txa_attempts = 0;
}
/*
* Process a received action frame using the default aggregation
* policy. We intercept ADDBA-related frames and use them to
* update our aggregation state. All other frames are passed up
* for processing by ieee80211_recv_action.
*/
static int
ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
const struct ieee80211_frame *wh,
const uint8_t *frm, const uint8_t *efrm)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_rx_ampdu *rap;
uint8_t dialogtoken;
uint16_t baparamset, batimeout, baseqctl;
uint16_t args[5];
int tid;
dialogtoken = frm[2];
baparamset = LE_READ_2(frm+3);
batimeout = LE_READ_2(frm+5);
baseqctl = LE_READ_2(frm+7);
tid = MS(baparamset, IEEE80211_BAPS_TID);
IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"recv ADDBA request: dialogtoken %u baparamset 0x%x "
"(tid %d bufsiz %d) batimeout %d baseqctl %d:%d",
dialogtoken, baparamset,
tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ),
batimeout,
MS(baseqctl, IEEE80211_BASEQ_START),
MS(baseqctl, IEEE80211_BASEQ_FRAG));
rap = &ni->ni_rx_ampdu[tid];
/* Send ADDBA response */
args[0] = dialogtoken;
/*
* NB: We ack only if the sta associated with HT and
* the ap is configured to do AMPDU rx (the latter
* violates the 11n spec and is mostly for testing).
*/
if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
(vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
/* XXX handle ampdu_rx_start failure */
ic->ic_ampdu_rx_start(ni, rap,
baparamset, batimeout, baseqctl);
args[1] = IEEE80211_STATUS_SUCCESS;
} else {
IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni, "reject ADDBA request: %s",
ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
"administratively disabled" :
"not negotiated for station");
vap->iv_stats.is_addba_reject++;
args[1] = IEEE80211_STATUS_UNSPECIFIED;
}
/* XXX honor rap flags? */
args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
| SM(tid, IEEE80211_BAPS_TID)
| SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
;
args[3] = 0;
args[4] = 0;
ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
return 0;
}
static int
ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
const struct ieee80211_frame *wh,
const uint8_t *frm, const uint8_t *efrm)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_tx_ampdu *tap;
uint8_t dialogtoken, policy;
uint16_t baparamset, batimeout, code;
int tid, ac, bufsiz;
dialogtoken = frm[2];
code = LE_READ_2(frm+3);
baparamset = LE_READ_2(frm+5);
tid = MS(baparamset, IEEE80211_BAPS_TID);
bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
policy = MS(baparamset, IEEE80211_BAPS_POLICY);
batimeout = LE_READ_2(frm+7);
ac = TID_TO_WME_AC(tid);
tap = &ni->ni_tx_ampdu[ac];
if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni->ni_macaddr, "ADDBA response",
"no pending ADDBA, tid %d dialogtoken %u "
"code %d", tid, dialogtoken, code);
vap->iv_stats.is_addba_norequest++;
return 0;
}
if (dialogtoken != tap->txa_token) {
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni->ni_macaddr, "ADDBA response",
"dialogtoken mismatch: waiting for %d, "
"received %d, tid %d code %d",
tap->txa_token, dialogtoken, tid, code);
vap->iv_stats.is_addba_badtoken++;
return 0;
}
/* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni->ni_macaddr, "ADDBA response",
"policy mismatch: expecting %s, "
"received %s, tid %d code %d",
tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
policy, tid, code);
vap->iv_stats.is_addba_badpolicy++;
return 0;
}
#if 0
/* XXX we take MIN in ieee80211_addba_response */
if (bufsiz > IEEE80211_AGGR_BAWMAX) {
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni->ni_macaddr, "ADDBA response",
"BA window too large: max %d, "
"received %d, tid %d code %d",
bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
vap->iv_stats.is_addba_badbawinsize++;
return 0;
}
#endif
IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"recv ADDBA response: dialogtoken %u code %d "
"baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
dialogtoken, code, baparamset, tid, bufsiz,
batimeout);
ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
return 0;
}
static int
ht_recv_action_ba_delba(struct ieee80211_node *ni,
const struct ieee80211_frame *wh,
const uint8_t *frm, const uint8_t *efrm)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_rx_ampdu *rap;
struct ieee80211_tx_ampdu *tap;
uint16_t baparamset, code;
int tid, ac;
baparamset = LE_READ_2(frm+2);
code = LE_READ_2(frm+4);
tid = MS(baparamset, IEEE80211_DELBAPS_TID);
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"recv DELBA: baparamset 0x%x (tid %d initiator %d) "
"code %d", baparamset, tid,
MS(baparamset, IEEE80211_DELBAPS_INIT), code);
if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
ac = TID_TO_WME_AC(tid);
tap = &ni->ni_tx_ampdu[ac];
ic->ic_addba_stop(ni, tap);
} else {
rap = &ni->ni_rx_ampdu[tid];
ic->ic_ampdu_rx_stop(ni, rap);
}
return 0;
}
static int
ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
const struct ieee80211_frame *wh,
const uint8_t *frm, const uint8_t *efrm)
{
int chw;
chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20;
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"%s: HT txchwidth, width %d%s",
__func__, chw, ni->ni_chw != chw ? "*" : "");
if (chw != ni->ni_chw) {
ni->ni_chw = chw;
/* XXX notify on change */
}
return 0;
}
static int
ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
const struct ieee80211_frame *wh,
const uint8_t *frm, const uint8_t *efrm)
{
const struct ieee80211_action_ht_mimopowersave *mps =
(const struct ieee80211_action_ht_mimopowersave *) frm;
/* XXX check iv_htcaps */
if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
else
ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
else
ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
/* XXX notify on change */
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"%s: HT MIMO PS (%s%s)", __func__,
(ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? "on" : "off",
(ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? "+rts" : ""
);
return 0;
}
/*
* Transmit processing.
*/
/*
* Check if A-MPDU should be requested/enabled for a stream.
* We require a traffic rate above a per-AC threshold and we
* also handle backoff from previous failed attempts.
*
* Drivers may override this method to bring in information
* such as link state conditions in making the decision.
*/
static int
ieee80211_ampdu_enable(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap)
{
struct ieee80211vap *vap = ni->ni_vap;
if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac])
return 0;
/* XXX check rssi? */
if (tap->txa_attempts >= ieee80211_addba_maxtries &&
ticks < tap->txa_nextrequest) {
/*
* Don't retry too often; txa_nextrequest is set
* to the minimum interval we'll retry after
* ieee80211_addba_maxtries failed attempts are made.
*/
return 0;
}
IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
"enable AMPDU on %s, avgpps %d pkts %d",
ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts);
return 1;
}
/*
* Request A-MPDU tx aggregation. Setup local state and
* issue an ADDBA request. BA use will only happen after
* the other end replies with ADDBA response.
*/
int
ieee80211_ampdu_request(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap)
{
struct ieee80211com *ic = ni->ni_ic;
uint16_t args[5];
int tid, dialogtoken;
static int tokens = 0; /* XXX */
/* XXX locking */
if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
/* do deferred setup of state */
ampdu_tx_setup(tap);
}
/* XXX hack for not doing proper locking */
tap->txa_flags &= ~IEEE80211_AGGR_NAK;
dialogtoken = (tokens+1) % 63; /* XXX */
tid = WME_AC_TO_TID(tap->txa_ac);
tap->txa_start = ni->ni_txseqs[tid];
args[0] = dialogtoken;
args[1] = 0; /* NB: status code not used */
args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
| SM(tid, IEEE80211_BAPS_TID)
| SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
;
args[3] = 0; /* batimeout */
/* NB: do first so there's no race against reply */
if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) {
/* unable to setup state, don't make request */
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
ni, "%s: could not setup BA stream for AC %d",
__func__, tap->txa_ac);
/* defer next try so we don't slam the driver with requests */
tap->txa_attempts = ieee80211_addba_maxtries;
/* NB: check in case driver wants to override */
if (tap->txa_nextrequest <= ticks)
tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
return 0;
}
tokens = dialogtoken; /* allocate token */
/* NB: after calling ic_addba_request so driver can set txa_start */
args[4] = SM(tap->txa_start, IEEE80211_BASEQ_START)
| SM(0, IEEE80211_BASEQ_FRAG)
;
return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
}
/*
* Terminate an AMPDU tx stream. State is reclaimed
* and the peer notified with a DelBA Action frame.
*/
void
ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
int reason)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
uint16_t args[4];
/* XXX locking */
tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
if (IEEE80211_AMPDU_RUNNING(tap)) {
IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni, "%s: stop BA stream for AC %d (reason %d)",
__func__, tap->txa_ac, reason);
vap->iv_stats.is_ampdu_stop++;
ic->ic_addba_stop(ni, tap);
args[0] = WME_AC_TO_TID(tap->txa_ac);
args[1] = IEEE80211_DELBAPS_INIT;
args[2] = reason; /* XXX reason code */
ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
IEEE80211_ACTION_BA_DELBA, args);
} else {
IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni, "%s: BA stream for AC %d not running (reason %d)",
__func__, tap->txa_ac, reason);
vap->iv_stats.is_ampdu_stop_failed++;
}
}
static void
bar_timeout(void *arg)
{
struct ieee80211_tx_ampdu *tap = arg;
struct ieee80211_node *ni = tap->txa_ni;
KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
("bar/addba collision, flags 0x%x", tap->txa_flags));
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
ni, "%s: tid %u flags 0x%x attempts %d", __func__,
tap->txa_ac, tap->txa_flags, tap->txa_attempts);
/* guard against race with bar_tx_complete */
if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
return;
/* XXX ? */
if (tap->txa_attempts >= ieee80211_bar_maxtries)
ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
else
ieee80211_send_bar(ni, tap, tap->txa_seqpending);
}
static void
bar_start_timer(struct ieee80211_tx_ampdu *tap)
{
callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
}
static void
bar_stop_timer(struct ieee80211_tx_ampdu *tap)
{
callout_stop(&tap->txa_timer);
}
static void
bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
{
struct ieee80211_tx_ampdu *tap = arg;
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
ni, "%s: tid %u flags 0x%x pending %d status %d",
__func__, tap->txa_ac, tap->txa_flags,
callout_pending(&tap->txa_timer), status);
/* XXX locking */
if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
callout_pending(&tap->txa_timer)) {
struct ieee80211com *ic = ni->ni_ic;
if (status == 0) /* ACK'd */
bar_stop_timer(tap);
ic->ic_bar_response(ni, tap, status);
/* NB: just let timer expire so we pace requests */
}
}
static void
ieee80211_bar_response(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap, int status)
{
if (status == 0) { /* got ACK */
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
tap->txa_start,
IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
tap->txa_qframes, tap->txa_seqpending,
WME_AC_TO_TID(tap->txa_ac));
/* NB: timer already stopped in bar_tx_complete */
tap->txa_start = tap->txa_seqpending;
tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
}
}
/*
* Transmit a BAR frame to the specified node. The
* BAR contents are drawn from the supplied aggregation
* state associated with the node.
*
* NB: we only handle immediate ACK w/ compressed bitmap.
*/
int
ieee80211_send_bar(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
{
#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_frame_bar *bar;
struct mbuf *m;
uint16_t barctl, barseqctl;
uint8_t *frm;
int tid, ret;
if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
/* no ADDBA response, should not happen */
/* XXX stat+msg */
return EINVAL;
}
/* XXX locking */
bar_stop_timer(tap);
ieee80211_ref_node(ni);
m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
if (m == NULL)
senderr(ENOMEM, is_tx_nobuf);
if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
m_freem(m);
senderr(ENOMEM, is_tx_nobuf); /* XXX */
/* NOTREACHED */
}
bar = mtod(m, struct ieee80211_frame_bar *);
bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
bar->i_fc[1] = 0;
IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
tid = WME_AC_TO_TID(tap->txa_ac);
barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
0 : IEEE80211_BAR_NOACK)
| IEEE80211_BAR_COMP
| SM(tid, IEEE80211_BAR_TID)
;
barseqctl = SM(seq, IEEE80211_BAR_SEQ_START);
/* NB: known to have proper alignment */
bar->i_ctl = htole16(barctl);
bar->i_seq = htole16(barseqctl);
m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
M_WME_SETAC(m, WME_AC_VO);
IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
/* XXX locking */
/* init/bump attempts counter */
if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
tap->txa_attempts = 1;
else
tap->txa_attempts++;
tap->txa_seqpending = seq;
tap->txa_flags |= IEEE80211_AGGR_BARPEND;
IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
tid, barctl, seq, tap->txa_attempts);
/*
* ic_raw_xmit will free the node reference
* regardless of queue/TX success or failure.
*/
ret = ic->ic_raw_xmit(ni, m, NULL);
if (ret != 0) {
/* xmit failed, clear state flag */
tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
return ret;
}
/* XXX hack against tx complete happening before timer is started */
if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
bar_start_timer(tap);
return 0;
bad:
ieee80211_free_node(ni);
return ret;
#undef senderr
}
static int
ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
{
struct ieee80211_bpf_params params;
memset(&params, 0, sizeof(params));
params.ibp_pri = WME_AC_VO;
params.ibp_rate0 = ni->ni_txparms->mgmtrate;
/* NB: we know all frames are unicast */
params.ibp_try0 = ni->ni_txparms->maxretry;
params.ibp_power = ni->ni_txpower;
return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
&params);
}
#define ADDSHORT(frm, v) do { \
frm[0] = (v) & 0xff; \
frm[1] = (v) >> 8; \
frm += 2; \
} while (0)
/*
* Send an action management frame. The arguments are stuff
* into a frame without inspection; the caller is assumed to
* prepare them carefully (e.g. based on the aggregation state).
*/
static int
ht_send_action_ba_addba(struct ieee80211_node *ni,
int category, int action, void *arg0)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
uint16_t *args = arg0;
struct mbuf *m;
uint8_t *frm;
IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"send ADDBA %s: dialogtoken %d status %d "
"baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
(action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
"request" : "response",
args[0], args[1], args[2], MS(args[2], IEEE80211_BAPS_TID),
args[3], args[4]);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
"ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
ieee80211_ref_node(ni);
m = ieee80211_getmgtframe(&frm,
ic->ic_headroom + sizeof(struct ieee80211_frame),
sizeof(uint16_t) /* action+category */
/* XXX may action payload */
+ sizeof(struct ieee80211_action_ba_addbaresponse)
);
if (m != NULL) {
*frm++ = category;
*frm++ = action;
*frm++ = args[0]; /* dialog token */
if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE)
ADDSHORT(frm, args[1]); /* status code */
ADDSHORT(frm, args[2]); /* baparamset */
ADDSHORT(frm, args[3]); /* batimeout */
if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
ADDSHORT(frm, args[4]); /* baseqctl */
m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
return ht_action_output(ni, m);
} else {
vap->iv_stats.is_tx_nobuf++;
ieee80211_free_node(ni);
return ENOMEM;
}
}
static int
ht_send_action_ba_delba(struct ieee80211_node *ni,
int category, int action, void *arg0)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
uint16_t *args = arg0;
struct mbuf *m;
uint16_t baparamset;
uint8_t *frm;
baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
| args[1]
;
IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"send DELBA action: tid %d, initiator %d reason %d",
args[0], args[1], args[2]);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
"ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
ieee80211_ref_node(ni);
m = ieee80211_getmgtframe(&frm,
ic->ic_headroom + sizeof(struct ieee80211_frame),
sizeof(uint16_t) /* action+category */
/* XXX may action payload */
+ sizeof(struct ieee80211_action_ba_addbaresponse)
);
if (m != NULL) {
*frm++ = category;
*frm++ = action;
ADDSHORT(frm, baparamset);
ADDSHORT(frm, args[2]); /* reason code */
m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
return ht_action_output(ni, m);
} else {
vap->iv_stats.is_tx_nobuf++;
ieee80211_free_node(ni);
return ENOMEM;
}
}
static int
ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
int category, int action, void *arg0)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct mbuf *m;
uint8_t *frm;
IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"send HT txchwidth: width %d",
IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
"ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
ieee80211_ref_node(ni);
m = ieee80211_getmgtframe(&frm,
ic->ic_headroom + sizeof(struct ieee80211_frame),
sizeof(uint16_t) /* action+category */
/* XXX may action payload */
+ sizeof(struct ieee80211_action_ba_addbaresponse)
);
if (m != NULL) {
*frm++ = category;
*frm++ = action;
*frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
IEEE80211_A_HT_TXCHWIDTH_2040 :
IEEE80211_A_HT_TXCHWIDTH_20;
m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
return ht_action_output(ni, m);
} else {
vap->iv_stats.is_tx_nobuf++;
ieee80211_free_node(ni);
return ENOMEM;
}
}
#undef ADDSHORT
/*
* Construct the MCS bit mask for inclusion in an HT capabilities
* information element.
*/
static void
ieee80211_set_mcsset(struct ieee80211com *ic, uint8_t *frm)
{
int i;
uint8_t txparams;
KASSERT((ic->ic_rxstream > 0 && ic->ic_rxstream <= 4),
("ic_rxstream %d out of range", ic->ic_rxstream));
KASSERT((ic->ic_txstream > 0 && ic->ic_txstream <= 4),
("ic_txstream %d out of range", ic->ic_txstream));
for (i = 0; i < ic->ic_rxstream * 8; i++)
setbit(frm, i);
if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
(ic->ic_htcaps & IEEE80211_HTC_RXMCS32))
setbit(frm, 32);
if (ic->ic_htcaps & IEEE80211_HTC_RXUNEQUAL) {
if (ic->ic_rxstream >= 2) {
for (i = 33; i <= 38; i++)
setbit(frm, i);
}
if (ic->ic_rxstream >= 3) {
for (i = 39; i <= 52; i++)
setbit(frm, i);
}
if (ic->ic_txstream >= 4) {
for (i = 53; i <= 76; i++)
setbit(frm, i);
}
}
if (ic->ic_rxstream != ic->ic_txstream) {
txparams = 0x1; /* TX MCS set defined */
txparams |= 0x2; /* TX RX MCS not equal */
txparams |= (ic->ic_txstream - 1) << 2; /* num TX streams */
if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL)
txparams |= 0x16; /* TX unequal modulation sup */
} else
txparams = 0;
frm[12] = txparams;
}
/*
* Add body of an HTCAP information element.
*/
static uint8_t *
ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
{
#define ADDSHORT(frm, v) do { \
frm[0] = (v) & 0xff; \
frm[1] = (v) >> 8; \
frm += 2; \
} while (0)
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
uint16_t caps, extcaps;
int rxmax, density;
/* HT capabilities */
caps = vap->iv_htcaps & 0xffff;
/*
* Note channel width depends on whether we are operating as
* a sta or not. When operating as a sta we are generating
* a request based on our desired configuration. Otherwise
* we are operational and the channel attributes identify
* how we've been setup (which might be different if a fixed
* channel is specified).
*/
if (vap->iv_opmode == IEEE80211_M_STA) {
/* override 20/40 use based on config */
if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
caps |= IEEE80211_HTCAP_CHWIDTH40;
else
caps &= ~IEEE80211_HTCAP_CHWIDTH40;
/* use advertised setting (XXX locally constraint) */
rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
/*
* NB: Hardware might support HT40 on some but not all
* channels. We can't determine this earlier because only
* after association the channel is upgraded to HT based
* on the negotiated capabilities.
*/
if (ni->ni_chan != IEEE80211_CHAN_ANYC &&
findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40U) == NULL &&
findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40D) == NULL)
caps &= ~IEEE80211_HTCAP_CHWIDTH40;
} else {
/* override 20/40 use based on current channel */
if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
caps |= IEEE80211_HTCAP_CHWIDTH40;
else
caps &= ~IEEE80211_HTCAP_CHWIDTH40;
rxmax = vap->iv_ampdu_rxmax;
density = vap->iv_ampdu_density;
}
/* adjust short GI based on channel and config */
if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
caps &= ~IEEE80211_HTCAP_SHORTGI20;
if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
(caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
caps &= ~IEEE80211_HTCAP_SHORTGI40;
ADDSHORT(frm, caps);
/* HT parameters */
*frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
| SM(density, IEEE80211_HTCAP_MPDUDENSITY)
;
frm++;
/* pre-zero remainder of ie */
memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
__offsetof(struct ieee80211_ie_htcap, hc_mcsset));
/* supported MCS set */
/*
* XXX: For sta mode the rate set should be restricted based
* on the AP's capabilities, but ni_htrates isn't setup when
* we're called to form an AssocReq frame so for now we're
* restricted to the device capabilities.
*/
ieee80211_set_mcsset(ni->ni_ic, frm);
frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
__offsetof(struct ieee80211_ie_htcap, hc_mcsset);
/* HT extended capabilities */
extcaps = vap->iv_htextcaps & 0xffff;
ADDSHORT(frm, extcaps);
frm += sizeof(struct ieee80211_ie_htcap) -
__offsetof(struct ieee80211_ie_htcap, hc_txbf);
return frm;
#undef ADDSHORT
}
/*
* Add 802.11n HT capabilities information element
*/
uint8_t *
ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
{
frm[0] = IEEE80211_ELEMID_HTCAP;
frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
return ieee80211_add_htcap_body(frm + 2, ni);
}
/*
* Add Broadcom OUI wrapped standard HTCAP ie; this is
* used for compatibility w/ pre-draft implementations.
*/
uint8_t *
ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
{
frm[0] = IEEE80211_ELEMID_VENDOR;
frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
frm[2] = (BCM_OUI >> 0) & 0xff;
frm[3] = (BCM_OUI >> 8) & 0xff;
frm[4] = (BCM_OUI >> 16) & 0xff;
frm[5] = BCM_OUI_HTCAP;
return ieee80211_add_htcap_body(frm + 6, ni);
}
/*
* Construct the MCS bit mask of basic rates
* for inclusion in an HT information element.
*/
static void
ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
{
int i;
for (i = 0; i < rs->rs_nrates; i++) {
int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
r < IEEE80211_HTRATE_MAXSIZE) {
/* NB: this assumes a particular implementation */
setbit(frm, r);
}
}
}
/*
* Update the HTINFO ie for a beacon frame.
*/
void
ieee80211_ht_update_beacon(struct ieee80211vap *vap,
struct ieee80211_beacon_offsets *bo)
{
#define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan;
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_ie_htinfo *ht =
(struct ieee80211_ie_htinfo *) bo->bo_htinfo;
/* XXX only update on channel change */
ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
else
ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
if (IEEE80211_IS_CHAN_HT40U(bsschan))
ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
else if (IEEE80211_IS_CHAN_HT40D(bsschan))
ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
else
ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
if (IEEE80211_IS_CHAN_HT40(bsschan))
ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
/* protection mode */
ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
/* XXX propagate to vendor ie's */
#undef PROTMODE
}
/*
* Add body of an HTINFO information element.
*
* NB: We don't use struct ieee80211_ie_htinfo because we can
* be called to fillin both a standard ie and a compat ie that
* has a vendor OUI at the front.
*/
static uint8_t *
ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
/* pre-zero remainder of ie */
memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
/* primary/control channel center */
*frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
else
frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
else
frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
frm[1] = ic->ic_curhtprotmode;
frm += 5;
/* basic MCS set */
ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
frm += sizeof(struct ieee80211_ie_htinfo) -
__offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
return frm;
}
/*
* Add 802.11n HT information information element.
*/
uint8_t *
ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
{
frm[0] = IEEE80211_ELEMID_HTINFO;
frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
return ieee80211_add_htinfo_body(frm + 2, ni);
}
/*
* Add Broadcom OUI wrapped standard HTINFO ie; this is
* used for compatibility w/ pre-draft implementations.
*/
uint8_t *
ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
{
frm[0] = IEEE80211_ELEMID_VENDOR;
frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
frm[2] = (BCM_OUI >> 0) & 0xff;
frm[3] = (BCM_OUI >> 8) & 0xff;
frm[4] = (BCM_OUI >> 16) & 0xff;
frm[5] = BCM_OUI_HTINFO;
return ieee80211_add_htinfo_body(frm + 6, ni);
}
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