/* * 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 2007-2008, 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 <net/wireless.h> #include <net/mac80211.h> #include "ieee80211_i.h" #include "rate.h" void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband, struct ieee80211_ht_cap *ht_cap_ie, struct ieee80211_sta_ht_cap *ht_cap) { u8 ampdu_info, tx_mcs_set_cap; int i, max_tx_streams; BUG_ON(!ht_cap); memset(ht_cap, 0, sizeof(*ht_cap)); if (!ht_cap_ie) return; ht_cap->ht_supported = true; ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & sband->ht_cap.cap; ht_cap->cap &= ~IEEE80211_HT_CAP_SM_PS; ht_cap->cap |= sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS; 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 = sband->ht_cap.mcs.tx_params; /* can we TX with MCS rates? */ if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) return; /* 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 D5.0 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] = sband->ht_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] = sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; /* handle MCS rate 32 too */ if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) ht_cap->mcs.rx_mask[32/8] |= 1; } /* * ieee80211_enable_ht should be called only after the operating band * has been determined as ht configuration depends on the hw's * HT abilities for a specific band. */ u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, struct ieee80211_ht_info *hti, u16 ap_ht_cap_flags) { struct ieee80211_local *local = sdata->local; struct ieee80211_supported_band *sband; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_bss_ht_conf ht; struct sta_info *sta; u32 changed = 0; bool enable_ht = true, ht_changed; enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; memset(&ht, 0, sizeof(ht)); /* HT is not supported */ if (!sband->ht_cap.ht_supported) enable_ht = false; /* check that channel matches the right operating channel */ if (local->hw.conf.channel->center_freq != ieee80211_channel_to_frequency(hti->control_chan)) enable_ht = false; if (enable_ht) { channel_type = NL80211_CHAN_HT20; if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: channel_type = NL80211_CHAN_HT40PLUS; break; case IEEE80211_HT_PARAM_CHA_SEC_BELOW: channel_type = NL80211_CHAN_HT40MINUS; break; } } } ht_changed = conf_is_ht(&local->hw.conf) != enable_ht || channel_type != local->hw.conf.channel_type; local->oper_channel_type = channel_type; if (ht_changed) { /* channel_type change automatically detected */ ieee80211_hw_config(local, 0); rcu_read_lock(); sta = sta_info_get(local, ifmgd->bssid); if (sta) rate_control_rate_update(local, sband, sta, IEEE80211_RC_HT_CHANGED); rcu_read_unlock(); } /* disable HT */ if (!enable_ht) return 0; ht.operation_mode = le16_to_cpu(hti->operation_mode); /* if bss configuration changed store the new one */ if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) { changed |= BSS_CHANGED_HT; sdata->vif.bss_conf.ht = ht; } return changed; } void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta) { int i; for (i = 0; i < STA_TID_NUM; i++) { __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR); __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, WLAN_REASON_QSTA_LEAVE_QBSS); } } 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) { printk(KERN_ERR "%s: failed to allocate buffer " "for delba frame\n", sdata->dev->name); 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->dev->dev_addr, ETH_ALEN); if (sdata->vif.type == NL80211_IFTYPE_AP || sdata->vif.type == NL80211_IFTYPE_AP_VLAN) memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); else if (sdata->vif.type == NL80211_IFTYPE_STATION) memcpy(mgmt->bssid, sdata->u.mgd.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, 1); } void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, struct ieee80211_mgmt *mgmt, size_t len) { struct ieee80211_local *local = sdata->local; 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; #ifdef CONFIG_MAC80211_HT_DEBUG if (net_ratelimit()) printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n", mgmt->sa, initiator ? "initiator" : "recipient", tid, mgmt->u.action.u.delba.reason_code); #endif /* CONFIG_MAC80211_HT_DEBUG */ if (initiator == WLAN_BACK_INITIATOR) ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid, WLAN_BACK_INITIATOR, 0); else { /* WLAN_BACK_RECIPIENT */ spin_lock_bh(&sta->lock); sta->ampdu_mlme.tid_state_tx[tid] = HT_AGG_STATE_OPERATIONAL; spin_unlock_bh(&sta->lock); ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, tid, WLAN_BACK_RECIPIENT); } }