mac80211: restructure HT code (b8695a8f) · Commits · e / devices / android_kernel_oneplus_sm8150

net/mac80211/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -8,7 +8,7 @@ mac80211-y := \
		wep.o \
		wpa.o \
		scan.o \
		ht.o \
		ht.o agg-tx.o agg-rx.o \
		mlme.o \
		iface.o \
		rate.o \

net/mac80211/agg-rx.c

0 → 100644

+287 −0

Original line number	Diff line number	Diff line
		/*
		* 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/mac80211.h>
		#include "ieee80211_i.h"

		void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data sdata, u8 ra, u16 tid,
		u16 initiator, u16 reason)
		{
		struct ieee80211_local *local = sdata->local;
		struct ieee80211_hw *hw = &local->hw;
		struct sta_info *sta;
		int ret, i;

		rcu_read_lock();

		sta = sta_info_get(local, ra);
		if (!sta) {
		rcu_read_unlock();
		return;
		}

		/* check if TID is in operational state */
		spin_lock_bh(&sta->lock);
		if (sta->ampdu_mlme.tid_state_rx[tid]
		!= HT_AGG_STATE_OPERATIONAL) {
		spin_unlock_bh(&sta->lock);
		rcu_read_unlock();
		return;
		}
		sta->ampdu_mlme.tid_state_rx[tid] =
		HT_AGG_STATE_REQ_STOP_BA_MSK \|
		(initiator << HT_AGG_STATE_INITIATOR_SHIFT);
		spin_unlock_bh(&sta->lock);

		/* stop HW Rx aggregation. ampdu_action existence
		* already verified in session init so we add the BUG_ON */
		BUG_ON(!local->ops->ampdu_action);

		#ifdef CONFIG_MAC80211_HT_DEBUG
		printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
		ra, tid);
		#endif /* CONFIG_MAC80211_HT_DEBUG */

		ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
		&sta->sta, tid, NULL);
		if (ret)
		printk(KERN_DEBUG "HW problem - can not stop rx "
		"aggregation for tid %d\n", tid);

		/* shutdown timer has not expired */
		if (initiator != WLAN_BACK_TIMER)
		del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);

		/* check if this is a self generated aggregation halt */
		if (initiator == WLAN_BACK_RECIPIENT \|\| initiator == WLAN_BACK_TIMER)
		ieee80211_send_delba(sdata, ra, tid, 0, reason);

		/* free the reordering buffer */
		for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
		if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
		/* release the reordered frames */
		dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
		sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
		sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
		}
		}
		/* free resources */
		kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
		kfree(sta->ampdu_mlme.tid_rx[tid]);
		sta->ampdu_mlme.tid_rx[tid] = NULL;
		sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;

		rcu_read_unlock();
		}

		/*
		* After accepting the AddBA Request we activated a timer,
		* resetting it after each frame that arrives from the originator.
		* if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
		*/
		static void sta_rx_agg_session_timer_expired(unsigned long data)
		{
		/* not an elegant detour, but there is no choice as the timer passes
		* only one argument, and various sta_info are needed here, so init
		* flow in sta_info_create gives the TID as data, while the timer_to_id
		* array gives the sta through container_of */
		u8 ptid = (u8 )data;
		u8 timer_to_id = ptid - ptid;
		struct sta_info *sta = container_of(timer_to_id, struct sta_info,
		timer_to_tid[0]);

		#ifdef CONFIG_MAC80211_HT_DEBUG
		printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
		#endif
		ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
		(u16)*ptid, WLAN_BACK_TIMER,
		WLAN_REASON_QSTA_TIMEOUT);
		}

		static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data sdata, u8 da, u16 tid,
		u8 dialog_token, u16 status, u16 policy,
		u16 buf_size, u16 timeout)
		{
		struct ieee80211_if_sta *ifsta = &sdata->u.sta;
		struct ieee80211_local *local = sdata->local;
		struct sk_buff *skb;
		struct ieee80211_mgmt *mgmt;
		u16 capab;

		skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);

		if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer "
		"for addba resp 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)
		memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
		else
		memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
		IEEE80211_STYPE_ACTION);

		skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
		mgmt->u.action.category = WLAN_CATEGORY_BACK;
		mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
		mgmt->u.action.u.addba_resp.dialog_token = dialog_token;

		capab = (u16)(policy << 1); /* bit 1 aggregation policy */
		capab \|= (u16)(tid << 2); /* bit 5:2 TID number */
		capab \|= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */

		mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
		mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
		mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);

		ieee80211_tx_skb(sdata, skb, 1);
		}

		void ieee80211_process_addba_request(struct ieee80211_local *local,
		struct sta_info *sta,
		struct ieee80211_mgmt *mgmt,
		size_t len)
		{
		struct ieee80211_hw *hw = &local->hw;
		struct ieee80211_conf *conf = &hw->conf;
		struct tid_ampdu_rx *tid_agg_rx;
		u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
		u8 dialog_token;
		int ret = -EOPNOTSUPP;

		/* extract session parameters from addba request frame */
		dialog_token = mgmt->u.action.u.addba_req.dialog_token;
		timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
		start_seq_num =
		le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;

		capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
		ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
		tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
		buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;

		status = WLAN_STATUS_REQUEST_DECLINED;

		/* sanity check for incoming parameters:
		* check if configuration can support the BA policy
		* and if buffer size does not exceeds max value */
		/* XXX: check own ht delayed BA capability?? */
		if (((ba_policy != 1)
		&& (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA)))
		\|\| (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
		status = WLAN_STATUS_INVALID_QOS_PARAM;
		#ifdef CONFIG_MAC80211_HT_DEBUG
		if (net_ratelimit())
		printk(KERN_DEBUG "AddBA Req with bad params from "
		"%pM on tid %u. policy %d, buffer size %d\n",
		mgmt->sa, tid, ba_policy,
		buf_size);
		#endif /* CONFIG_MAC80211_HT_DEBUG */
		goto end_no_lock;
		}
		/* determine default buffer size */
		if (buf_size == 0) {
		struct ieee80211_supported_band *sband;

		sband = local->hw.wiphy->bands[conf->channel->band];
		buf_size = IEEE80211_MIN_AMPDU_BUF;
		buf_size = buf_size << sband->ht_cap.ampdu_factor;
		}


		/* examine state machine */
		spin_lock_bh(&sta->lock);

		if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
		#ifdef CONFIG_MAC80211_HT_DEBUG
		if (net_ratelimit())
		printk(KERN_DEBUG "unexpected AddBA Req from "
		"%pM on tid %u\n",
		mgmt->sa, tid);
		#endif /* CONFIG_MAC80211_HT_DEBUG */
		goto end;
		}

		/* prepare A-MPDU MLME for Rx aggregation */
		sta->ampdu_mlme.tid_rx[tid] =
		kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
		if (!sta->ampdu_mlme.tid_rx[tid]) {
		#ifdef CONFIG_MAC80211_HT_DEBUG
		if (net_ratelimit())
		printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
		tid);
		#endif
		goto end;
		}
		/* rx timer */
		sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
		sta_rx_agg_session_timer_expired;
		sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
		(unsigned long)&sta->timer_to_tid[tid];
		init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);

		tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];

		/* prepare reordering buffer */
		tid_agg_rx->reorder_buf =
		kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
		if (!tid_agg_rx->reorder_buf) {
		#ifdef CONFIG_MAC80211_HT_DEBUG
		if (net_ratelimit())
		printk(KERN_ERR "can not allocate reordering buffer "
		"to tid %d\n", tid);
		#endif
		kfree(sta->ampdu_mlme.tid_rx[tid]);
		goto end;
		}

		if (local->ops->ampdu_action)
		ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
		&sta->sta, tid, &start_seq_num);
		#ifdef CONFIG_MAC80211_HT_DEBUG
		printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
		#endif /* CONFIG_MAC80211_HT_DEBUG */

		if (ret) {
		kfree(tid_agg_rx->reorder_buf);
		kfree(tid_agg_rx);
		sta->ampdu_mlme.tid_rx[tid] = NULL;
		goto end;
		}

		/* change state and send addba resp */
		sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
		tid_agg_rx->dialog_token = dialog_token;
		tid_agg_rx->ssn = start_seq_num;
		tid_agg_rx->head_seq_num = start_seq_num;
		tid_agg_rx->buf_size = buf_size;
		tid_agg_rx->timeout = timeout;
		tid_agg_rx->stored_mpdu_num = 0;
		status = WLAN_STATUS_SUCCESS;
		end:
		spin_unlock_bh(&sta->lock);

		end_no_lock:
		ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
		dialog_token, status, 1, buf_size, timeout);
		}

net/mac80211/agg-tx.c

0 → 100644

+593 −0

File added.

Preview size limit exceeded, changes collapsed.

net/mac80211/ht.c

+11 −856

File changed.

Preview size limit exceeded, changes collapsed.

net/mac80211/ieee80211_i.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -987,6 +987,9 @@ u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
		struct ieee80211_ht_info *hti,
		u16 ap_ht_cap_flags);
		void ieee80211_send_bar(struct ieee80211_sub_if_data sdata, u8 ra, u16 tid, u16 ssn);
		void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
		const u8 *da, u16 tid,
		u16 initiator, u16 reason_code);

		void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data sdata, u8 da,
		u16 tid, u16 initiator, u16 reason);