| /****************************************************************************** |
| * |
| * 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); |
| } |
