292 lines
7.7 KiB
C
292 lines
7.7 KiB
C
/******************************************************************************
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*
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* Copyright(c) 2009-2012 Realtek Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
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*
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* The full GNU General Public License is included in this distribution in the
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* file called LICENSE.
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*
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* Contact Information:
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* wlanfae <wlanfae@realtek.com>
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* Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
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* Hsinchu 300, Taiwan.
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*
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* Larry Finger <Larry.Finger@lwfinger.net>
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*
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*****************************************************************************/
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#include "wifi.h"
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#include "base.h"
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#include "rc.h"
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/*
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*Finds the highest rate index we can use
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*if skb is special data like DHCP/EAPOL, we set should
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*it to lowest rate CCK_1M, otherwise we set rate to
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*CCK11M or OFDM_54M based on wireless mode.
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*/
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static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv,
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struct ieee80211_sta *sta,
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struct sk_buff *skb, bool not_data)
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{
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struct rtl_mac *rtlmac = rtl_mac(rtlpriv);
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struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
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struct rtl_phy *rtlphy = &(rtlpriv->phy);
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struct rtl_sta_info *sta_entry = NULL;
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u8 wireless_mode = 0;
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/*
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*this rate is no use for true rate, firmware
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*will control rate at all it just used for
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*1.show in iwconfig in B/G mode
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*2.in rtl_get_tcb_desc when we check rate is
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* 1M we will not use FW rate but user rate.
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*/
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if (rtlmac->opmode == NL80211_IFTYPE_AP ||
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rtlmac->opmode == NL80211_IFTYPE_ADHOC) {
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if (sta) {
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sta_entry = (struct rtl_sta_info *) sta->drv_priv;
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wireless_mode = sta_entry->wireless_mode;
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} else {
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return 0;
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}
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} else {
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wireless_mode = rtlmac->mode;
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}
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if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true) ||
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not_data) {
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return 0;
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} else {
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if (rtlhal->current_bandtype == BAND_ON_2_4G) {
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if (wireless_mode == WIRELESS_MODE_B) {
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return B_MODE_MAX_RIX;
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} else if (wireless_mode == WIRELESS_MODE_G) {
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return G_MODE_MAX_RIX;
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} else {
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if (get_rf_type(rtlphy) != RF_2T2R)
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return N_MODE_MCS7_RIX;
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else
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return N_MODE_MCS15_RIX;
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}
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} else {
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if (wireless_mode == WIRELESS_MODE_A) {
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return A_MODE_MAX_RIX;
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} else {
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if (get_rf_type(rtlphy) != RF_2T2R)
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return N_MODE_MCS7_RIX;
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else
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return N_MODE_MCS15_RIX;
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}
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}
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}
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}
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static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
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struct ieee80211_sta *sta,
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struct ieee80211_tx_rate *rate,
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struct ieee80211_tx_rate_control *txrc,
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u8 tries, char rix, int rtsctsenable,
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bool not_data)
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{
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struct rtl_mac *mac = rtl_mac(rtlpriv);
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u8 sgi_20 = 0, sgi_40 = 0;
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if (sta) {
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sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
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sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
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}
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rate->count = tries;
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rate->idx = rix >= 0x00 ? rix : 0x00;
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if (!not_data) {
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if (txrc->short_preamble)
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rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
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if (mac->opmode == NL80211_IFTYPE_AP ||
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mac->opmode == NL80211_IFTYPE_ADHOC) {
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if (sta && (sta->ht_cap.cap &
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IEEE80211_HT_CAP_SUP_WIDTH_20_40))
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rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
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} else {
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if (mac->bw_40)
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rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
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}
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if (sgi_20 || sgi_40)
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rate->flags |= IEEE80211_TX_RC_SHORT_GI;
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if (sta && sta->ht_cap.ht_supported)
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rate->flags |= IEEE80211_TX_RC_MCS;
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}
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}
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static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
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void *priv_sta, struct ieee80211_tx_rate_control *txrc)
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{
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struct rtl_priv *rtlpriv = ppriv;
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struct sk_buff *skb = txrc->skb;
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struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
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struct ieee80211_tx_rate *rates = tx_info->control.rates;
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__le16 fc = rtl_get_fc(skb);
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u8 try_per_rate, i, rix;
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bool not_data = !ieee80211_is_data(fc);
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if (rate_control_send_low(sta, priv_sta, txrc))
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return;
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rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
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try_per_rate = 1;
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_rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
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try_per_rate, rix, 1, not_data);
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if (!not_data) {
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for (i = 1; i < 4; i++)
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_rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
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txrc, i, (rix - i), 1,
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not_data);
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}
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}
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static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
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struct rtl_sta_info *sta_entry, u16 tid)
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{
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struct rtl_mac *mac = rtl_mac(rtlpriv);
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if (mac->act_scanning)
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return false;
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if (mac->opmode == NL80211_IFTYPE_STATION &&
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mac->cnt_after_linked < 3)
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return false;
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if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
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return true;
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return false;
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}
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/*mac80211 Rate Control callbacks*/
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static void rtl_tx_status(void *ppriv,
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struct ieee80211_supported_band *sband,
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struct ieee80211_sta *sta, void *priv_sta,
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struct sk_buff *skb)
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{
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struct rtl_priv *rtlpriv = ppriv;
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struct rtl_mac *mac = rtl_mac(rtlpriv);
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struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
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__le16 fc = rtl_get_fc(skb);
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struct rtl_sta_info *sta_entry;
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if (!priv_sta || !ieee80211_is_data(fc))
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return;
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if (rtl_is_special_data(mac->hw, skb, true))
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return;
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if (is_multicast_ether_addr(ieee80211_get_DA(hdr))
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|| is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
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return;
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if (sta) {
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/* Check if aggregation has to be enabled for this tid */
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sta_entry = (struct rtl_sta_info *) sta->drv_priv;
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if ((sta->ht_cap.ht_supported) &&
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!(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
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if (ieee80211_is_data_qos(fc)) {
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u8 tid = rtl_get_tid(skb);
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if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
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tid)) {
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sta_entry->tids[tid].agg.agg_state =
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RTL_AGG_PROGRESS;
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ieee80211_start_tx_ba_session(sta,
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tid, 5000);
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}
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}
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}
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}
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}
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static void rtl_rate_init(void *ppriv,
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struct ieee80211_supported_band *sband,
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struct ieee80211_sta *sta, void *priv_sta)
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{
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}
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static void rtl_rate_update(void *ppriv,
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struct ieee80211_supported_band *sband,
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struct ieee80211_sta *sta, void *priv_sta,
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u32 changed,
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enum nl80211_channel_type oper_chan_type)
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{
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}
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static void *rtl_rate_alloc(struct ieee80211_hw *hw,
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struct dentry *debugfsdir)
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{
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struct rtl_priv *rtlpriv = rtl_priv(hw);
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return rtlpriv;
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}
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static void rtl_rate_free(void *rtlpriv)
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{
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return;
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}
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static void *rtl_rate_alloc_sta(void *ppriv,
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struct ieee80211_sta *sta, gfp_t gfp)
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{
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struct rtl_priv *rtlpriv = ppriv;
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struct rtl_rate_priv *rate_priv;
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rate_priv = kzalloc(sizeof(struct rtl_rate_priv), gfp);
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if (!rate_priv) {
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RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
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"Unable to allocate private rc structure\n");
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return NULL;
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}
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rtlpriv->rate_priv = rate_priv;
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return rate_priv;
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}
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static void rtl_rate_free_sta(void *rtlpriv,
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struct ieee80211_sta *sta, void *priv_sta)
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{
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struct rtl_rate_priv *rate_priv = priv_sta;
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kfree(rate_priv);
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}
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static struct rate_control_ops rtl_rate_ops = {
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.module = NULL,
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.name = "rtl_rc",
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.alloc = rtl_rate_alloc,
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.free = rtl_rate_free,
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.alloc_sta = rtl_rate_alloc_sta,
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.free_sta = rtl_rate_free_sta,
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.rate_init = rtl_rate_init,
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.rate_update = rtl_rate_update,
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.tx_status = rtl_tx_status,
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.get_rate = rtl_get_rate,
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};
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int rtl_rate_control_register(void)
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{
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return ieee80211_rate_control_register(&rtl_rate_ops);
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}
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void rtl_rate_control_unregister(void)
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{
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ieee80211_rate_control_unregister(&rtl_rate_ops);
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}
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