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-rw-r--r--drivers/net/wireless/rtlwifi/rc.c329
1 files changed, 329 insertions, 0 deletions
diff --git a/drivers/net/wireless/rtlwifi/rc.c b/drivers/net/wireless/rtlwifi/rc.c
new file mode 100644
index 00000000000..91634107434
--- /dev/null
+++ b/drivers/net/wireless/rtlwifi/rc.c
@@ -0,0 +1,329 @@
+/******************************************************************************
+ *
+ * Copyright(c) 2009-2010 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 sk_buff *skb, bool not_data)
+{
+ struct rtl_mac *rtlmac = rtl_mac(rtlpriv);
+
+ /*
+ *mgt use 1M, although we have check it
+ *before this function use rate_control_send_low,
+ *we still check it here
+ */
+ if (not_data)
+ return rtlpriv->cfg->maps[RTL_RC_CCK_RATE1M];
+
+ /*
+ *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 (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true)) {
+ return rtlpriv->cfg->maps[RTL_RC_CCK_RATE1M];
+ } else {
+ if (rtlmac->mode == WIRELESS_MODE_B)
+ return rtlpriv->cfg->maps[RTL_RC_CCK_RATE11M];
+ else
+ return rtlpriv->cfg->maps[RTL_RC_OFDM_RATE54M];
+ }
+}
+
+static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
+ struct ieee80211_tx_rate *rate,
+ struct ieee80211_tx_rate_control *txrc,
+ u8 tries, u8 rix, int rtsctsenable,
+ bool not_data)
+{
+ struct rtl_mac *mac = rtl_mac(rtlpriv);
+
+ rate->count = tries;
+ rate->idx = (rix > 0x2) ? rix : 0x2;
+
+ if (!not_data) {
+ if (txrc->short_preamble)
+ rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
+ if (mac->bw_40)
+ rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
+ if (mac->sgi_20 || mac->sgi_40)
+ rate->flags |= IEEE80211_TX_RC_SHORT_GI;
+ if (mac->ht_enable)
+ 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;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ __le16 fc = hdr->frame_control;
+ 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, skb, not_data);
+
+ try_per_rate = 1;
+ _rtl_rc_rate_set_series(rtlpriv, &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, &rates[i],
+ txrc, i, (rix - i), 1,
+ not_data);
+ }
+}
+
+static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv, u16 tid)
+{
+ struct rtl_mac *mac = rtl_mac(rtlpriv);
+
+ if (mac->act_scanning)
+ return false;
+
+ if (mac->cnt_after_linked < 3)
+ return false;
+
+ if (mac->tids[tid].agg.agg_state == RTL_AGG_OFF)
+ 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;
+ __le16 fc;
+
+ hdr = (struct ieee80211_hdr *)skb->data;
+ fc = hdr->frame_control;
+
+ 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;
+
+ /* Check if aggregation has to be enabled for this tid */
+ if (conf_is_ht(&mac->hw->conf) &&
+ !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
+ if (ieee80211_is_data_qos(fc)) {
+ u8 *qc, tid;
+
+ qc = ieee80211_get_qos_ctl(hdr);
+ tid = qc[0] & 0xf;
+
+ if (_rtl_tx_aggr_check(rtlpriv, tid))
+ ieee80211_start_tx_ba_session(sta, tid, 5000);
+ }
+ }
+}
+
+static void rtl_rate_init(void *ppriv,
+ struct ieee80211_supported_band *sband,
+ struct ieee80211_sta *sta, void *priv_sta)
+{
+ struct rtl_priv *rtlpriv = ppriv;
+ struct rtl_mac *mac = rtl_mac(rtlpriv);
+ u8 is_ht = conf_is_ht(&mac->hw->conf);
+
+ if ((mac->opmode == NL80211_IFTYPE_STATION) ||
+ (mac->opmode == NL80211_IFTYPE_MESH_POINT) ||
+ (mac->opmode == NL80211_IFTYPE_ADHOC)) {
+
+ switch (sband->band) {
+ case IEEE80211_BAND_2GHZ:
+ rtlpriv->rate_priv->cur_ratetab_idx =
+ RATR_INX_WIRELESS_G;
+ if (is_ht)
+ rtlpriv->rate_priv->cur_ratetab_idx =
+ RATR_INX_WIRELESS_NGB;
+ break;
+ case IEEE80211_BAND_5GHZ:
+ rtlpriv->rate_priv->cur_ratetab_idx =
+ RATR_INX_WIRELESS_A;
+ if (is_ht)
+ rtlpriv->rate_priv->cur_ratetab_idx =
+ RATR_INX_WIRELESS_NGB;
+ break;
+ default:
+ RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
+ ("Invalid band\n"));
+ rtlpriv->rate_priv->cur_ratetab_idx =
+ RATR_INX_WIRELESS_NGB;
+ break;
+ }
+
+ RT_TRACE(rtlpriv, COMP_RATE, DBG_DMESG,
+ ("Choosing rate table index: %d\n",
+ rtlpriv->rate_priv->cur_ratetab_idx));
+
+ }
+
+}
+
+static void rtl_rate_update(void *ppriv,
+ struct ieee80211_supported_band *sband,
+ struct ieee80211_sta *sta, void *priv_sta,
+ u32 changed,
+ enum nl80211_channel_type oper_chan_type)
+{
+ struct rtl_priv *rtlpriv = ppriv;
+ struct rtl_mac *mac = rtl_mac(rtlpriv);
+ struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
+ bool oper_cw40 = false, oper_sgi40;
+ bool local_cw40 = mac->bw_40;
+ bool local_sgi40 = mac->sgi_40;
+ u8 is_ht = conf_is_ht(&mac->hw->conf);
+
+ if (changed & IEEE80211_RC_HT_CHANGED) {
+ if (mac->opmode != NL80211_IFTYPE_STATION)
+ return;
+
+ if (rtlhal->hw->conf.channel_type == NL80211_CHAN_HT40MINUS ||
+ rtlhal->hw->conf.channel_type == NL80211_CHAN_HT40PLUS)
+ oper_cw40 = true;
+
+ oper_sgi40 = mac->sgi_40;
+
+ if ((local_cw40 != oper_cw40) || (local_sgi40 != oper_sgi40)) {
+ switch (sband->band) {
+ case IEEE80211_BAND_2GHZ:
+ rtlpriv->rate_priv->cur_ratetab_idx =
+ RATR_INX_WIRELESS_G;
+ if (is_ht)
+ rtlpriv->rate_priv->cur_ratetab_idx =
+ RATR_INX_WIRELESS_NGB;
+ break;
+ case IEEE80211_BAND_5GHZ:
+ rtlpriv->rate_priv->cur_ratetab_idx =
+ RATR_INX_WIRELESS_A;
+ if (is_ht)
+ rtlpriv->rate_priv->cur_ratetab_idx =
+ RATR_INX_WIRELESS_NGB;
+ break;
+ default:
+ RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
+ ("Invalid band\n"));
+ rtlpriv->rate_priv->cur_ratetab_idx =
+ RATR_INX_WIRELESS_NGB;
+ break;
+ }
+ }
+ }
+}
+
+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,
+ .rate_init = rtl_rate_init,
+ .rate_update = rtl_rate_update,
+ .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);
+}
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