[deliverable/linux.git] / drivers / net / wireless / rtlwifi / rc.c

/******************************************************************************
 *
 * Copyright(c) 2009-2012  Realtek Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 * wlanfae <wlanfae@realtek.com>
 * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
 * Hsinchu 300, Taiwan.
 *
 * Larry Finger <Larry.Finger@lwfinger.net>
 *
 *****************************************************************************/

#include "wifi.h"
#include "base.h"
#include "rc.h"

/*
 *Finds the highest rate index we can use
 *if skb is special data like DHCP/EAPOL, we set should
 *it to lowest rate CCK_1M, otherwise we set rate to
 *CCK11M or OFDM_54M based on wireless mode.
 */
static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv,
				  struct ieee80211_sta *sta,
				  struct sk_buff *skb, bool not_data)
{
	struct rtl_mac *rtlmac = rtl_mac(rtlpriv);
	struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
	struct rtl_phy *rtlphy = &(rtlpriv->phy);
	struct rtl_sta_info *sta_entry = NULL;
	u8 wireless_mode = 0;

	/*
	 *this rate is no use for true rate, firmware
	 *will control rate at all it just used for
	 *1.show in iwconfig in B/G mode
	 *2.in rtl_get_tcb_desc when we check rate is
	 *      1M we will not use FW rate but user rate.
	 */
	if (rtlmac->opmode == NL80211_IFTYPE_AP ||
	    rtlmac->opmode == NL80211_IFTYPE_ADHOC ||
	    rtlmac->opmode == NL80211_IFTYPE_MESH_POINT) {
		if (sta) {
			sta_entry = (struct rtl_sta_info *) sta->drv_priv;
			wireless_mode = sta_entry->wireless_mode;
		} else {
			return 0;
		}
	} else {
		wireless_mode = rtlmac->mode;
	}

	if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true) ||
			not_data) {
		return 0;
	} else {
		if (rtlhal->current_bandtype == BAND_ON_2_4G) {
			if (wireless_mode == WIRELESS_MODE_B) {
				return B_MODE_MAX_RIX;
			} else if (wireless_mode == WIRELESS_MODE_G) {
				return G_MODE_MAX_RIX;
			} else {
				if (get_rf_type(rtlphy) != RF_2T2R)
					return N_MODE_MCS7_RIX;
				else
					return N_MODE_MCS15_RIX;
			}
		} else {
			if (wireless_mode == WIRELESS_MODE_A) {
				return A_MODE_MAX_RIX;
			} else {
				if (get_rf_type(rtlphy) != RF_2T2R)
					return N_MODE_MCS7_RIX;
				else
					return N_MODE_MCS15_RIX;
			}
		}
	}
}

static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
				    struct ieee80211_sta *sta,
				    struct ieee80211_tx_rate *rate,
				    struct ieee80211_tx_rate_control *txrc,
				    u8 tries, char rix, int rtsctsenable,
				    bool not_data)
{
	struct rtl_mac *mac = rtl_mac(rtlpriv);
	u8 sgi_20 = 0, sgi_40 = 0;

	if (sta) {
		sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
		sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
	}
	rate->count = tries;
	rate->idx = rix >= 0x00 ? rix : 0x00;

	if (!not_data) {
		if (txrc->short_preamble)
			rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
		if (mac->opmode == NL80211_IFTYPE_AP ||
			mac->opmode == NL80211_IFTYPE_ADHOC) {
			if (sta && (sta->ht_cap.cap &
			    IEEE80211_HT_CAP_SUP_WIDTH_20_40))
				rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
		} else {
			if (mac->bw_40)
				rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
		}
		if (sgi_20 || sgi_40)
			rate->flags |= IEEE80211_TX_RC_SHORT_GI;
		if (sta && sta->ht_cap.ht_supported)
			rate->flags |= IEEE80211_TX_RC_MCS;
	}
}

static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
			 void *priv_sta, struct ieee80211_tx_rate_control *txrc)
{
	struct rtl_priv *rtlpriv = ppriv;
	struct sk_buff *skb = txrc->skb;
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
	struct ieee80211_tx_rate *rates = tx_info->control.rates;
	__le16 fc = rtl_get_fc(skb);
	u8 try_per_rate, i, rix;
	bool not_data = !ieee80211_is_data(fc);

	if (rate_control_send_low(sta, priv_sta, txrc))
		return;

	rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
	try_per_rate = 1;
	_rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
				try_per_rate, rix, 1, not_data);

	if (!not_data) {
		for (i = 1; i < 4; i++)
			_rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
						txrc, i, (rix - i), 1,
						not_data);
	}
}

static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
		struct rtl_sta_info *sta_entry, u16 tid)
{
	struct rtl_mac *mac = rtl_mac(rtlpriv);

	if (mac->act_scanning)
		return false;

	if (mac->opmode == NL80211_IFTYPE_STATION &&
		mac->cnt_after_linked < 3)
		return false;

	if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
		return true;

	return false;
}

/*mac80211 Rate Control callbacks*/
static void rtl_tx_status(void *ppriv,
			  struct ieee80211_supported_band *sband,
			  struct ieee80211_sta *sta, void *priv_sta,
			  struct sk_buff *skb)
{
	struct rtl_priv *rtlpriv = ppriv;
	struct rtl_mac *mac = rtl_mac(rtlpriv);
	struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
	__le16 fc = rtl_get_fc(skb);
	struct rtl_sta_info *sta_entry;

	if (!priv_sta || !ieee80211_is_data(fc))
		return;

	if (rtl_is_special_data(mac->hw, skb, true))
		return;

	if (is_multicast_ether_addr(ieee80211_get_DA(hdr))
	    || is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
		return;

	if (sta) {
		/* Check if aggregation has to be enabled for this tid */
		sta_entry = (struct rtl_sta_info *) sta->drv_priv;
		if ((sta->ht_cap.ht_supported) &&
				!(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
			if (ieee80211_is_data_qos(fc)) {
				u8 tid = rtl_get_tid(skb);
				if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
				    tid)) {
					sta_entry->tids[tid].agg.agg_state =
							 RTL_AGG_PROGRESS;
					ieee80211_start_tx_ba_session(sta,
								 tid, 5000);
				}
			}
		}
	}
}

static void *rtl_rate_alloc(struct ieee80211_hw *hw,
		struct dentry *debugfsdir)
{
	struct rtl_priv *rtlpriv = rtl_priv(hw);
	return rtlpriv;
}

static void rtl_rate_free(void *rtlpriv)
{
	return;
}

static void *rtl_rate_alloc_sta(void *ppriv,
				struct ieee80211_sta *sta, gfp_t gfp)
{
	struct rtl_priv *rtlpriv = ppriv;
	struct rtl_rate_priv *rate_priv;

	rate_priv = kzalloc(sizeof(struct rtl_rate_priv), gfp);
	if (!rate_priv) {
		RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
			 "Unable to allocate private rc structure\n");
		return NULL;
	}

	rtlpriv->rate_priv = rate_priv;

	return rate_priv;
}

static void rtl_rate_free_sta(void *rtlpriv,
			      struct ieee80211_sta *sta, void *priv_sta)
{
	struct rtl_rate_priv *rate_priv = priv_sta;
	kfree(rate_priv);
}

static struct rate_control_ops rtl_rate_ops = {
	.module = NULL,
	.name = "rtl_rc",
	.alloc = rtl_rate_alloc,
	.free = rtl_rate_free,
	.alloc_sta = rtl_rate_alloc_sta,
	.free_sta = rtl_rate_free_sta,
	.tx_status = rtl_tx_status,
	.get_rate = rtl_get_rate,
};

int rtl_rate_control_register(void)
{
	return ieee80211_rate_control_register(&rtl_rate_ops);
}

void rtl_rate_control_unregister(void)
{
	ieee80211_rate_control_unregister(&rtl_rate_ops);
}
Commit	Line	Data
0c817338 LF	1	/******************************************************************************
0c817338 LF	2	*
a8d76066	3	* Copyright(c) 2009-2012 Realtek Corporation.
0c817338 LF	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of version 2 of the GNU General Public License as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along with
	15	* this program; if not, write to the Free Software Foundation, Inc.,
	16	* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
	17	*
	18	* The full GNU General Public License is included in this distribution in the
	19	* file called LICENSE.
	20	*
	21	* Contact Information:
	22	* wlanfae <wlanfae@realtek.com>
	23	* Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
	24	* Hsinchu 300, Taiwan.
	25	*
	26	* Larry Finger <Larry.Finger@lwfinger.net>
	27	*
	28	*****************************************************************************/
	29
	30	#include "wifi.h"
	31	#include "base.h"
	32	#include "rc.h"
	33
	34	/*
	35	*Finds the highest rate index we can use
	36	*if skb is special data like DHCP/EAPOL, we set should
	37	*it to lowest rate CCK_1M, otherwise we set rate to
	38	*CCK11M or OFDM_54M based on wireless mode.
	39	*/
	40	static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv,
c6a9de08	41	struct ieee80211_sta *sta,
0c817338 LF	42	struct sk_buff *skb, bool not_data)
	43	{
	44	struct rtl_mac *rtlmac = rtl_mac(rtlpriv);
c6a9de08 C	45	struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
	46	struct rtl_phy *rtlphy = &(rtlpriv->phy);
	47	struct rtl_sta_info *sta_entry = NULL;
	48	u8 wireless_mode = 0;
0c817338 LF	49
	50	/*
	51	*this rate is no use for true rate, firmware
	52	*will control rate at all it just used for
	53	*1.show in iwconfig in B/G mode
	54	*2.in rtl_get_tcb_desc when we check rate is
	55	* 1M we will not use FW rate but user rate.
	56	*/
c6a9de08	57	if (rtlmac->opmode == NL80211_IFTYPE_AP \|\|
0f015453 LF	58	rtlmac->opmode == NL80211_IFTYPE_ADHOC \|\|
0f015453 LF	59	rtlmac->opmode == NL80211_IFTYPE_MESH_POINT) {
c6a9de08 C	60	if (sta) {
	61	sta_entry = (struct rtl_sta_info *) sta->drv_priv;
	62	wireless_mode = sta_entry->wireless_mode;
	63	} else {
	64	return 0;
	65	}
0c817338	66	} else {
c6a9de08 C	67	wireless_mode = rtlmac->mode;
	68	}
	69
	70	if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true) \|\|
	71	not_data) {
	72	return 0;
	73	} else {
	74	if (rtlhal->current_bandtype == BAND_ON_2_4G) {
	75	if (wireless_mode == WIRELESS_MODE_B) {
	76	return B_MODE_MAX_RIX;
	77	} else if (wireless_mode == WIRELESS_MODE_G) {
	78	return G_MODE_MAX_RIX;
	79	} else {
	80	if (get_rf_type(rtlphy) != RF_2T2R)
	81	return N_MODE_MCS7_RIX;
	82	else
	83	return N_MODE_MCS15_RIX;
	84	}
	85	} else {
	86	if (wireless_mode == WIRELESS_MODE_A) {
	87	return A_MODE_MAX_RIX;
	88	} else {
	89	if (get_rf_type(rtlphy) != RF_2T2R)
	90	return N_MODE_MCS7_RIX;
	91	else
	92	return N_MODE_MCS15_RIX;
	93	}
	94	}
0c817338 LF	95	}
	96	}
	97
	98	static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
c6a9de08	99	struct ieee80211_sta *sta,
0c817338 LF	100	struct ieee80211_tx_rate *rate,
0c817338 LF	101	struct ieee80211_tx_rate_control *txrc,
c6a9de08	102	u8 tries, char rix, int rtsctsenable,
0c817338 LF	103	bool not_data)
	104	{
	105	struct rtl_mac *mac = rtl_mac(rtlpriv);
c6a9de08	106	u8 sgi_20 = 0, sgi_40 = 0;
0c817338	107
c6a9de08 C	108	if (sta) {
	109	sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
	110	sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
	111	}
0c817338	112	rate->count = tries;
c6a9de08	113	rate->idx = rix >= 0x00 ? rix : 0x00;
0c817338 LF	114
	115	if (!not_data) {
	116	if (txrc->short_preamble)
	117	rate->flags \|= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
c6a9de08 C	118	if (mac->opmode == NL80211_IFTYPE_AP \|\|
	119	mac->opmode == NL80211_IFTYPE_ADHOC) {
	120	if (sta && (sta->ht_cap.cap &
	121	IEEE80211_HT_CAP_SUP_WIDTH_20_40))
	122	rate->flags \|= IEEE80211_TX_RC_40_MHZ_WIDTH;
	123	} else {
	124	if (mac->bw_40)
	125	rate->flags \|= IEEE80211_TX_RC_40_MHZ_WIDTH;
	126	}
	127	if (sgi_20 \|\| sgi_40)
0c817338	128	rate->flags \|= IEEE80211_TX_RC_SHORT_GI;
c6a9de08	129	if (sta && sta->ht_cap.ht_supported)
0c817338 LF	130	rate->flags \|= IEEE80211_TX_RC_MCS;
	131	}
	132	}
	133
	134	static void rtl_get_rate(void ppriv, struct ieee80211_sta sta,
	135	void priv_sta, struct ieee80211_tx_rate_control txrc)
	136	{
	137	struct rtl_priv *rtlpriv = ppriv;
	138	struct sk_buff *skb = txrc->skb;
	139	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
	140	struct ieee80211_tx_rate *rates = tx_info->control.rates;
c6a9de08	141	__le16 fc = rtl_get_fc(skb);
0c817338 LF	142	u8 try_per_rate, i, rix;
	143	bool not_data = !ieee80211_is_data(fc);
	144
	145	if (rate_control_send_low(sta, priv_sta, txrc))
	146	return;
	147
c6a9de08	148	rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
0c817338	149	try_per_rate = 1;
c6a9de08	150	_rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
0c817338 LF	151	try_per_rate, rix, 1, not_data);
	152
	153	if (!not_data) {
	154	for (i = 1; i < 4; i++)
c6a9de08	155	_rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
0c817338 LF	156	txrc, i, (rix - i), 1,
	157	not_data);
	158	}
	159	}
	160
c6a9de08 C	161	static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
c6a9de08 C	162	struct rtl_sta_info *sta_entry, u16 tid)
0c817338 LF	163	{
	164	struct rtl_mac *mac = rtl_mac(rtlpriv);
	165
	166	if (mac->act_scanning)
	167	return false;
	168
c6a9de08 C	169	if (mac->opmode == NL80211_IFTYPE_STATION &&
c6a9de08 C	170	mac->cnt_after_linked < 3)
0c817338 LF	171	return false;
0c817338 LF	172
c6a9de08	173	if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
0c817338 LF	174	return true;
	175
	176	return false;
	177	}
	178
	179	/mac80211 Rate Control callbacks/
	180	static void rtl_tx_status(void *ppriv,
	181	struct ieee80211_supported_band *sband,
	182	struct ieee80211_sta sta, void priv_sta,
	183	struct sk_buff *skb)
	184	{
	185	struct rtl_priv *rtlpriv = ppriv;
	186	struct rtl_mac *mac = rtl_mac(rtlpriv);
c6a9de08 C	187	struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
	188	__le16 fc = rtl_get_fc(skb);
	189	struct rtl_sta_info *sta_entry;
0c817338 LF	190
	191	if (!priv_sta \|\| !ieee80211_is_data(fc))
	192	return;
	193
	194	if (rtl_is_special_data(mac->hw, skb, true))
	195	return;
	196
	197	if (is_multicast_ether_addr(ieee80211_get_DA(hdr))
	198	\|\| is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
	199	return;
	200
c6a9de08 C	201	if (sta) {
	202	/* Check if aggregation has to be enabled for this tid */
	203	sta_entry = (struct rtl_sta_info *) sta->drv_priv;
e10542c4	204	if ((sta->ht_cap.ht_supported) &&
c6a9de08 C	205	!(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
	206	if (ieee80211_is_data_qos(fc)) {
	207	u8 tid = rtl_get_tid(skb);
	208	if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
	209	tid)) {
	210	sta_entry->tids[tid].agg.agg_state =
	211	RTL_AGG_PROGRESS;
	212	ieee80211_start_tx_ba_session(sta,
	213	tid, 5000);
	214	}
	215	}
0c817338 LF	216	}
	217	}
	218	}
	219
0c817338 LF	220	static void rtl_rate_alloc(struct ieee80211_hw hw,
	221	struct dentry *debugfsdir)
	222	{
	223	struct rtl_priv *rtlpriv = rtl_priv(hw);
	224	return rtlpriv;
	225	}
	226
	227	static void rtl_rate_free(void *rtlpriv)
	228	{
	229	return;
	230	}
	231
	232	static void rtl_rate_alloc_sta(void ppriv,
	233	struct ieee80211_sta *sta, gfp_t gfp)
	234	{
	235	struct rtl_priv *rtlpriv = ppriv;
	236	struct rtl_rate_priv *rate_priv;
	237
	238	rate_priv = kzalloc(sizeof(struct rtl_rate_priv), gfp);
	239	if (!rate_priv) {
	240	RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
f30d7507	241	"Unable to allocate private rc structure\n");
0c817338 LF	242	return NULL;
	243	}
	244
	245	rtlpriv->rate_priv = rate_priv;
	246
	247	return rate_priv;
	248	}
	249
	250	static void rtl_rate_free_sta(void *rtlpriv,
	251	struct ieee80211_sta sta, void priv_sta)
	252	{
	253	struct rtl_rate_priv *rate_priv = priv_sta;
	254	kfree(rate_priv);
	255	}
	256
	257	static struct rate_control_ops rtl_rate_ops = {
	258	.module = NULL,
	259	.name = "rtl_rc",
	260	.alloc = rtl_rate_alloc,
	261	.free = rtl_rate_free,
	262	.alloc_sta = rtl_rate_alloc_sta,
	263	.free_sta = rtl_rate_free_sta,
0c817338 LF	264	.tx_status = rtl_tx_status,
	265	.get_rate = rtl_get_rate,
	266	};
	267
	268	int rtl_rate_control_register(void)
	269	{
	270	return ieee80211_rate_control_register(&rtl_rate_ops);
	271	}
	272
	273	void rtl_rate_control_unregister(void)
	274	{
	275	ieee80211_rate_control_unregister(&rtl_rate_ops);
	276	}