0f78231bff
Enable spatial multiplexing in mac80211 by telling the driver what to do and, where necessary, sending action frames to the AP to update the requested SMPS mode. Also includes a trivial implementation for hwsim that just logs the requested mode. For now, the userspace interface is in debugfs only, and let you toggle the requested mode at any time. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
216 lines
6.6 KiB
C
216 lines
6.6 KiB
C
/*
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* HT handling
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*
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* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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* Copyright 2007-2008, Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/ieee80211.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "rate.h"
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void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
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struct ieee80211_ht_cap *ht_cap_ie,
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struct ieee80211_sta_ht_cap *ht_cap)
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{
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u8 ampdu_info, tx_mcs_set_cap;
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int i, max_tx_streams;
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BUG_ON(!ht_cap);
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memset(ht_cap, 0, sizeof(*ht_cap));
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if (!ht_cap_ie)
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return;
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ht_cap->ht_supported = true;
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ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & sband->ht_cap.cap;
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ht_cap->cap &= ~IEEE80211_HT_CAP_SM_PS;
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ht_cap->cap |= sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS;
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ampdu_info = ht_cap_ie->ampdu_params_info;
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ht_cap->ampdu_factor =
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ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
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ht_cap->ampdu_density =
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(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
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/* own MCS TX capabilities */
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tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
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/* can we TX with MCS rates? */
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if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
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return;
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/* Counting from 0, therefore +1 */
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if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
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max_tx_streams =
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((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
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>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
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else
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max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
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/*
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* 802.11n D5.0 20.3.5 / 20.6 says:
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* - indices 0 to 7 and 32 are single spatial stream
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* - 8 to 31 are multiple spatial streams using equal modulation
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* [8..15 for two streams, 16..23 for three and 24..31 for four]
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* - remainder are multiple spatial streams using unequal modulation
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*/
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for (i = 0; i < max_tx_streams; i++)
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ht_cap->mcs.rx_mask[i] =
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sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
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if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
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for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
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i < IEEE80211_HT_MCS_MASK_LEN; i++)
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ht_cap->mcs.rx_mask[i] =
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sband->ht_cap.mcs.rx_mask[i] &
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ht_cap_ie->mcs.rx_mask[i];
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/* handle MCS rate 32 too */
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if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
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ht_cap->mcs.rx_mask[32/8] |= 1;
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}
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void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
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{
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int i;
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for (i = 0; i < STA_TID_NUM; i++) {
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__ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
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__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
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WLAN_REASON_QSTA_LEAVE_QBSS);
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}
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}
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void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
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const u8 *da, u16 tid,
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u16 initiator, u16 reason_code)
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{
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struct ieee80211_local *local = sdata->local;
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struct sk_buff *skb;
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struct ieee80211_mgmt *mgmt;
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u16 params;
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skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
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if (!skb) {
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printk(KERN_ERR "%s: failed to allocate buffer "
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"for delba frame\n", sdata->name);
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return;
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}
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skb_reserve(skb, local->hw.extra_tx_headroom);
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mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
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memset(mgmt, 0, 24);
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memcpy(mgmt->da, da, ETH_ALEN);
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memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
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if (sdata->vif.type == NL80211_IFTYPE_AP ||
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sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
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memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
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else if (sdata->vif.type == NL80211_IFTYPE_STATION)
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memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
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mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
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IEEE80211_STYPE_ACTION);
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skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
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mgmt->u.action.category = WLAN_CATEGORY_BACK;
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mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
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params = (u16)(initiator << 11); /* bit 11 initiator */
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params |= (u16)(tid << 12); /* bit 15:12 TID number */
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mgmt->u.action.u.delba.params = cpu_to_le16(params);
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mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
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ieee80211_tx_skb(sdata, skb);
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}
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void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta,
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struct ieee80211_mgmt *mgmt, size_t len)
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{
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u16 tid, params;
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u16 initiator;
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params = le16_to_cpu(mgmt->u.action.u.delba.params);
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tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
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initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
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#ifdef CONFIG_MAC80211_HT_DEBUG
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if (net_ratelimit())
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printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
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mgmt->sa, initiator ? "initiator" : "recipient", tid,
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le16_to_cpu(mgmt->u.action.u.delba.reason_code));
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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if (initiator == WLAN_BACK_INITIATOR)
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ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid,
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WLAN_BACK_INITIATOR, 0);
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else { /* WLAN_BACK_RECIPIENT */
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spin_lock_bh(&sta->lock);
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if (sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)
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___ieee80211_stop_tx_ba_session(sta, tid,
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WLAN_BACK_RECIPIENT);
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spin_unlock_bh(&sta->lock);
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}
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}
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int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
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enum ieee80211_smps_mode smps, const u8 *da,
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const u8 *bssid)
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{
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struct ieee80211_local *local = sdata->local;
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struct sk_buff *skb;
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struct ieee80211_mgmt *action_frame;
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/* 27 = header + category + action + smps mode */
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skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
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if (!skb)
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return -ENOMEM;
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skb_reserve(skb, local->hw.extra_tx_headroom);
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action_frame = (void *)skb_put(skb, 27);
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memcpy(action_frame->da, da, ETH_ALEN);
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memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
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memcpy(action_frame->bssid, bssid, ETH_ALEN);
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action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
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IEEE80211_STYPE_ACTION);
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action_frame->u.action.category = WLAN_CATEGORY_HT;
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action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
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switch (smps) {
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case IEEE80211_SMPS_AUTOMATIC:
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case IEEE80211_SMPS_NUM_MODES:
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WARN_ON(1);
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case IEEE80211_SMPS_OFF:
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action_frame->u.action.u.ht_smps.smps_control =
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WLAN_HT_SMPS_CONTROL_DISABLED;
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break;
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case IEEE80211_SMPS_STATIC:
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action_frame->u.action.u.ht_smps.smps_control =
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WLAN_HT_SMPS_CONTROL_STATIC;
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break;
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case IEEE80211_SMPS_DYNAMIC:
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action_frame->u.action.u.ht_smps.smps_control =
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WLAN_HT_SMPS_CONTROL_DYNAMIC;
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break;
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}
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/* we'll do more on status of this frame */
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IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
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ieee80211_tx_skb(sdata, skb);
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return 0;
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}
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