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linux/net/mac80211/ht.c

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/*
* HT handling
*
* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
* Copyright 2007-2010, Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/ieee80211.h>
#include <linux/export.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "rate.h"
static void __check_htcap_disable(struct ieee80211_ht_cap *ht_capa,
struct ieee80211_ht_cap *ht_capa_mask,
struct ieee80211_sta_ht_cap *ht_cap,
u16 flag)
{
__le16 le_flag = cpu_to_le16(flag);
if (ht_capa_mask->cap_info & le_flag) {
if (!(ht_capa->cap_info & le_flag))
ht_cap->cap &= ~flag;
}
}
static void __check_htcap_enable(struct ieee80211_ht_cap *ht_capa,
struct ieee80211_ht_cap *ht_capa_mask,
struct ieee80211_sta_ht_cap *ht_cap,
u16 flag)
{
__le16 le_flag = cpu_to_le16(flag);
if ((ht_capa_mask->cap_info & le_flag) &&
(ht_capa->cap_info & le_flag))
ht_cap->cap |= flag;
}
void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
struct ieee80211_sta_ht_cap *ht_cap)
{
struct ieee80211_ht_cap *ht_capa, *ht_capa_mask;
u8 *scaps, *smask;
int i;
if (!ht_cap->ht_supported)
return;
switch (sdata->vif.type) {
case NL80211_IFTYPE_STATION:
ht_capa = &sdata->u.mgd.ht_capa;
ht_capa_mask = &sdata->u.mgd.ht_capa_mask;
break;
case NL80211_IFTYPE_ADHOC:
ht_capa = &sdata->u.ibss.ht_capa;
ht_capa_mask = &sdata->u.ibss.ht_capa_mask;
break;
default:
WARN_ON_ONCE(1);
return;
}
scaps = (u8 *)(&ht_capa->mcs.rx_mask);
smask = (u8 *)(&ht_capa_mask->mcs.rx_mask);
/* NOTE: If you add more over-rides here, update register_hw
* ht_capa_mod_mask logic in main.c as well.
* And, if this method can ever change ht_cap.ht_supported, fix
* the check in ieee80211_add_ht_ie.
*/
/* check for HT over-rides, MCS rates first. */
for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
u8 m = smask[i];
ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
/* Add back rates that are supported */
ht_cap->mcs.rx_mask[i] |= (m & scaps[i]);
}
/* Force removal of HT-40 capabilities? */
__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
IEEE80211_HT_CAP_SUP_WIDTH_20_40);
__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
IEEE80211_HT_CAP_SGI_40);
/* Allow user to disable SGI-20 (SGI-40 is handled above) */
__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
IEEE80211_HT_CAP_SGI_20);
/* Allow user to disable the max-AMSDU bit. */
__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
IEEE80211_HT_CAP_MAX_AMSDU);
/* Allow user to disable LDPC */
__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
IEEE80211_HT_CAP_LDPC_CODING);
/* Allow user to enable 40 MHz intolerant bit. */
__check_htcap_enable(ht_capa, ht_capa_mask, ht_cap,
IEEE80211_HT_CAP_40MHZ_INTOLERANT);
/* Allow user to decrease AMPDU factor */
if (ht_capa_mask->ampdu_params_info &
IEEE80211_HT_AMPDU_PARM_FACTOR) {
u8 n = ht_capa->ampdu_params_info &
IEEE80211_HT_AMPDU_PARM_FACTOR;
if (n < ht_cap->ampdu_factor)
ht_cap->ampdu_factor = n;
}
/* Allow the user to increase AMPDU density. */
if (ht_capa_mask->ampdu_params_info &
IEEE80211_HT_AMPDU_PARM_DENSITY) {
u8 n = (ht_capa->ampdu_params_info &
IEEE80211_HT_AMPDU_PARM_DENSITY)
>> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
if (n > ht_cap->ampdu_density)
ht_cap->ampdu_density = n;
}
}
bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
struct ieee80211_supported_band *sband,
const struct ieee80211_ht_cap *ht_cap_ie,
struct sta_info *sta)
{
struct ieee80211_sta_ht_cap ht_cap, own_cap;
u8 ampdu_info, tx_mcs_set_cap;
int i, max_tx_streams;
bool changed;
enum ieee80211_sta_rx_bandwidth bw;
enum ieee80211_smps_mode smps_mode;
memset(&ht_cap, 0, sizeof(ht_cap));
if (!ht_cap_ie || !sband->ht_cap.ht_supported)
goto apply;
ht_cap.ht_supported = true;
own_cap = sband->ht_cap;
/*
* If user has specified capability over-rides, take care
* of that if the station we're setting up is the AP or TDLS peer that
* we advertised a restricted capability set to. Override
* our own capabilities and then use those below.
*/
if (sdata->vif.type == NL80211_IFTYPE_STATION ||
sdata->vif.type == NL80211_IFTYPE_ADHOC)
ieee80211_apply_htcap_overrides(sdata, &own_cap);
/*
* The bits listed in this expression should be
* the same for the peer and us, if the station
* advertises more then we can't use those thus
* we mask them out.
*/
ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) &
(own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING |
IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
IEEE80211_HT_CAP_GRN_FLD |
IEEE80211_HT_CAP_SGI_20 |
IEEE80211_HT_CAP_SGI_40 |
IEEE80211_HT_CAP_DSSSCCK40));
/*
* The STBC bits are asymmetric -- if we don't have
* TX then mask out the peer's RX and vice versa.
*/
if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC))
ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC;
if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC))
ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC;
ampdu_info = ht_cap_ie->ampdu_params_info;
ht_cap.ampdu_factor =
ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
ht_cap.ampdu_density =
(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
/* own MCS TX capabilities */
tx_mcs_set_cap = own_cap.mcs.tx_params;
/* Copy peer MCS TX capabilities, the driver might need them. */
ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params;
/* can we TX with MCS rates? */
if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
goto apply;
/* Counting from 0, therefore +1 */
if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
max_tx_streams =
((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
else
max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
/*
* 802.11n-2009 20.3.5 / 20.6 says:
* - indices 0 to 7 and 32 are single spatial stream
* - 8 to 31 are multiple spatial streams using equal modulation
* [8..15 for two streams, 16..23 for three and 24..31 for four]
* - remainder are multiple spatial streams using unequal modulation
*/
for (i = 0; i < max_tx_streams; i++)
ht_cap.mcs.rx_mask[i] =
own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
i < IEEE80211_HT_MCS_MASK_LEN; i++)
ht_cap.mcs.rx_mask[i] =
own_cap.mcs.rx_mask[i] &
ht_cap_ie->mcs.rx_mask[i];
/* handle MCS rate 32 too */
if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
ht_cap.mcs.rx_mask[32/8] |= 1;
/* set Rx highest rate */
ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest;
if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU)
sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935;
else
sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839;
apply:
changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
switch (sdata->vif.bss_conf.chandef.width) {
default:
WARN_ON_ONCE(1);
/* fall through */
case NL80211_CHAN_WIDTH_20_NOHT:
case NL80211_CHAN_WIDTH_20:
bw = IEEE80211_STA_RX_BW_20;
break;
case NL80211_CHAN_WIDTH_40:
case NL80211_CHAN_WIDTH_80:
case NL80211_CHAN_WIDTH_80P80:
case NL80211_CHAN_WIDTH_160:
bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
break;
}
sta->sta.bandwidth = bw;
sta->cur_max_bandwidth =
ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
>> IEEE80211_HT_CAP_SM_PS_SHIFT) {
case WLAN_HT_CAP_SM_PS_INVALID:
case WLAN_HT_CAP_SM_PS_STATIC:
smps_mode = IEEE80211_SMPS_STATIC;
break;
case WLAN_HT_CAP_SM_PS_DYNAMIC:
smps_mode = IEEE80211_SMPS_DYNAMIC;
break;
case WLAN_HT_CAP_SM_PS_DISABLED:
smps_mode = IEEE80211_SMPS_OFF;
break;
}
if (smps_mode != sta->sta.smps_mode)
changed = true;
sta->sta.smps_mode = smps_mode;
return changed;
}
void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
enum ieee80211_agg_stop_reason reason)
{
int i;
cancel_work_sync(&sta->ampdu_mlme.work);
for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
__ieee80211_stop_tx_ba_session(sta, i, reason);
__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
WLAN_REASON_QSTA_LEAVE_QBSS,
reason != AGG_STOP_DESTROY_STA &&
reason != AGG_STOP_PEER_REQUEST);
}
}
void ieee80211_ba_session_work(struct work_struct *work)
{
struct sta_info *sta =
container_of(work, struct sta_info, ampdu_mlme.work);
struct tid_ampdu_tx *tid_tx;
int tid;
/*
* When this flag is set, new sessions should be
* blocked, and existing sessions will be torn
* down by the code that set the flag, so this
* need not run.
*/
if (test_sta_flag(sta, WLAN_STA_BLOCK_BA))
return;
mutex_lock(&sta->ampdu_mlme.mtx);
for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
___ieee80211_stop_rx_ba_session(
sta, tid, WLAN_BACK_RECIPIENT,
WLAN_REASON_QSTA_TIMEOUT, true);
if (test_and_clear_bit(tid,
sta->ampdu_mlme.tid_rx_stop_requested))
___ieee80211_stop_rx_ba_session(
sta, tid, WLAN_BACK_RECIPIENT,
WLAN_REASON_UNSPECIFIED, true);
spin_lock_bh(&sta->lock);
tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
if (tid_tx) {
/*
* Assign it over to the normal tid_tx array
* where it "goes live".
*/
sta->ampdu_mlme.tid_start_tx[tid] = NULL;
/* could there be a race? */
if (sta->ampdu_mlme.tid_tx[tid])
kfree(tid_tx);
else
ieee80211_assign_tid_tx(sta, tid, tid_tx);
spin_unlock_bh(&sta->lock);
ieee80211_tx_ba_session_handle_start(sta, tid);
continue;
}
spin_unlock_bh(&sta->lock);
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
&tid_tx->state))
___ieee80211_stop_tx_ba_session(sta, tid,
AGG_STOP_LOCAL_REQUEST);
}
mutex_unlock(&sta->ampdu_mlme.mtx);
}
void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
const u8 *da, u16 tid,
u16 initiator, u16 reason_code)
{
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
u16 params;
skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
if (!skb)
return;
skb_reserve(skb, local->hw.extra_tx_headroom);
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
memset(mgmt, 0, 24);
memcpy(mgmt->da, da, ETH_ALEN);
memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
if (sdata->vif.type == NL80211_IFTYPE_AP ||
sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
else if (sdata->vif.type == NL80211_IFTYPE_STATION)
memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_ACTION);
skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
mgmt->u.action.category = WLAN_CATEGORY_BACK;
mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
params = (u16)(initiator << 11); /* bit 11 initiator */
params |= (u16)(tid << 12); /* bit 15:12 TID number */
mgmt->u.action.u.delba.params = cpu_to_le16(params);
mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
ieee80211_tx_skb(sdata, skb);
}
void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta,
struct ieee80211_mgmt *mgmt, size_t len)
{
u16 tid, params;
u16 initiator;
params = le16_to_cpu(mgmt->u.action.u.delba.params);
tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
mgmt->sa, initiator ? "initiator" : "recipient",
tid,
le16_to_cpu(mgmt->u.action.u.delba.reason_code));
if (initiator == WLAN_BACK_INITIATOR)
__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
true);
else
__ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
}
int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
enum ieee80211_smps_mode smps, const u8 *da,
const u8 *bssid)
{
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct ieee80211_mgmt *action_frame;
/* 27 = header + category + action + smps mode */
skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
if (!skb)
return -ENOMEM;
skb_reserve(skb, local->hw.extra_tx_headroom);
action_frame = (void *)skb_put(skb, 27);
memcpy(action_frame->da, da, ETH_ALEN);
memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
memcpy(action_frame->bssid, bssid, ETH_ALEN);
action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_ACTION);
action_frame->u.action.category = WLAN_CATEGORY_HT;
action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
switch (smps) {
case IEEE80211_SMPS_AUTOMATIC:
case IEEE80211_SMPS_NUM_MODES:
WARN_ON(1);
case IEEE80211_SMPS_OFF:
action_frame->u.action.u.ht_smps.smps_control =
WLAN_HT_SMPS_CONTROL_DISABLED;
break;
case IEEE80211_SMPS_STATIC:
action_frame->u.action.u.ht_smps.smps_control =
WLAN_HT_SMPS_CONTROL_STATIC;
break;
case IEEE80211_SMPS_DYNAMIC:
action_frame->u.action.u.ht_smps.smps_control =
WLAN_HT_SMPS_CONTROL_DYNAMIC;
break;
}
/* we'll do more on status of this frame */
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
ieee80211_tx_skb(sdata, skb);
return 0;
}
void ieee80211_request_smps_mgd_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data,
u.mgd.request_smps_work);
sdata_lock(sdata);
__ieee80211_request_smps_mgd(sdata, sdata->u.mgd.driver_smps_mode);
sdata_unlock(sdata);
}
void ieee80211_request_smps_ap_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data,
u.ap.request_smps_work);
sdata_lock(sdata);
if (sdata_dereference(sdata->u.ap.beacon, sdata))
__ieee80211_request_smps_ap(sdata,
sdata->u.ap.driver_smps_mode);
sdata_unlock(sdata);
}
void ieee80211_request_smps(struct ieee80211_vif *vif,
enum ieee80211_smps_mode smps_mode)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION &&
vif->type != NL80211_IFTYPE_AP))
return;
if (vif->type == NL80211_IFTYPE_STATION) {
if (sdata->u.mgd.driver_smps_mode == smps_mode)
return;
sdata->u.mgd.driver_smps_mode = smps_mode;
ieee80211_queue_work(&sdata->local->hw,
&sdata->u.mgd.request_smps_work);
} else {
/* AUTOMATIC is meaningless in AP mode */
if (WARN_ON_ONCE(smps_mode == IEEE80211_SMPS_AUTOMATIC))
return;
if (sdata->u.ap.driver_smps_mode == smps_mode)
return;
sdata->u.ap.driver_smps_mode = smps_mode;
ieee80211_queue_work(&sdata->local->hw,
&sdata->u.ap.request_smps_work);
}
}
/* this might change ... don't want non-open drivers using it */
EXPORT_SYMBOL_GPL(ieee80211_request_smps);
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