drivers/net/wireless/iwlwifi/mvm/sf.c

   1 /******************************************************************************
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   6  * GPL LICENSE SUMMARY
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   8  * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  10  *
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  33  *
  34  * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
  35  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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  39  * modification, are permitted provided that the following conditions
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  50  *    from this software without specific prior written permission.
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  52  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  53  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  54  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  55  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  56  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  57  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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  62  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  63  *
  64  *****************************************************************************/
  65 #include "mvm.h"
  66
  67 /* For counting bound interfaces */
  68 struct iwl_mvm_active_iface_iterator_data {
  69         struct ieee80211_vif *ignore_vif;
  70         u8 sta_vif_ap_sta_id;
  71         enum iwl_sf_state sta_vif_state;
  72         int num_active_macs;
  73 };
  74
  75 /*
  76  * Count bound interfaces which are not p2p, besides data->ignore_vif.
  77  * data->station_vif will point to one bound vif of type station, if exists.
  78  */
  79 static void iwl_mvm_bound_iface_iterator(void *_data, u8 *mac,
  80                                          struct ieee80211_vif *vif)
  81 {
  82         struct iwl_mvm_active_iface_iterator_data *data = _data;
  83         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
  84
  85         if (vif == data->ignore_vif || !mvmvif->phy_ctxt ||
  86             vif->type == NL80211_IFTYPE_P2P_DEVICE)
  87                 return;
  88
  89         data->num_active_macs++;
  90
  91         if (vif->type == NL80211_IFTYPE_STATION) {
  92                 data->sta_vif_ap_sta_id = mvmvif->ap_sta_id;
  93                 if (vif->bss_conf.assoc)
  94                         data->sta_vif_state = SF_FULL_ON;
  95                 else
  96                         data->sta_vif_state = SF_INIT_OFF;
  97         }
  98 }
  99
 100 /*
 101  * Aging and idle timeouts for the different possible scenarios
 102  * in SF_FULL_ON state.
 103  */
 104 static const __le32 sf_full_timeout[SF_NUM_SCENARIO][SF_NUM_TIMEOUT_TYPES] = {
 105         {
 106                 cpu_to_le32(SF_SINGLE_UNICAST_AGING_TIMER),
 107                 cpu_to_le32(SF_SINGLE_UNICAST_IDLE_TIMER)
 108         },
 109         {
 110                 cpu_to_le32(SF_AGG_UNICAST_AGING_TIMER),
 111                 cpu_to_le32(SF_AGG_UNICAST_IDLE_TIMER)
 112         },
 113         {
 114                 cpu_to_le32(SF_MCAST_AGING_TIMER),
 115                 cpu_to_le32(SF_MCAST_IDLE_TIMER)
 116         },
 117         {
 118                 cpu_to_le32(SF_BA_AGING_TIMER),
 119                 cpu_to_le32(SF_BA_IDLE_TIMER)
 120         },
 121         {
 122                 cpu_to_le32(SF_TX_RE_AGING_TIMER),
 123                 cpu_to_le32(SF_TX_RE_IDLE_TIMER)
 124         },
 125 };
 126
 127 static void iwl_mvm_fill_sf_command(struct iwl_sf_cfg_cmd *sf_cmd,
 128                                     struct ieee80211_sta *sta)
 129 {
 130         int i, j, watermark;
 131
 132         sf_cmd->watermark[SF_LONG_DELAY_ON] = cpu_to_le32(SF_W_MARK_SCAN);
 133
 134         /*
 135          * If we are in association flow - check antenna configuration
 136          * capabilities of the AP station, and choose the watermark accordingly.
 137          */
 138         if (sta) {
 139                 if (sta->ht_cap.ht_supported || sta->vht_cap.vht_supported) {
 140                         switch (sta->rx_nss) {
 141                         case 1:
 142                                 watermark = SF_W_MARK_SISO;
 143                                 break;
 144                         case 2:
 145                                 watermark = SF_W_MARK_MIMO2;
 146                                 break;
 147                         default:
 148                                 watermark = SF_W_MARK_MIMO3;
 149                                 break;
 150                         }
 151                 } else {
 152                         watermark = SF_W_MARK_LEGACY;
 153                 }
 154         /* default watermark value for unassociated mode. */
 155         } else {
 156                 watermark = SF_W_MARK_MIMO2;
 157         }
 158         sf_cmd->watermark[SF_FULL_ON] = cpu_to_le32(watermark);
 159
 160         for (i = 0; i < SF_NUM_SCENARIO; i++) {
 161                 for (j = 0; j < SF_NUM_TIMEOUT_TYPES; j++) {
 162                         sf_cmd->long_delay_timeouts[i][j] =
 163                                         cpu_to_le32(SF_LONG_DELAY_AGING_TIMER);
 164                 }
 165         }
 166         BUILD_BUG_ON(sizeof(sf_full_timeout) !=
 167                      sizeof(__le32) * SF_NUM_SCENARIO * SF_NUM_TIMEOUT_TYPES);
 168
 169         memcpy(sf_cmd->full_on_timeouts, sf_full_timeout,
 170                sizeof(sf_full_timeout));
 171 }
 172
 173 static int iwl_mvm_sf_config(struct iwl_mvm *mvm, u8 sta_id,
 174                              enum iwl_sf_state new_state)
 175 {
 176         struct iwl_sf_cfg_cmd sf_cmd = {
 177                 .state = cpu_to_le32(new_state),
 178         };
 179         struct ieee80211_sta *sta;
 180         int ret = 0;
 181
 182         if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_SF_NO_DUMMY_NOTIF &&
 183             mvm->cfg->disable_dummy_notification)
 184                 sf_cmd.state |= cpu_to_le32(SF_CFG_DUMMY_NOTIF_OFF);
 185
 186         /*
 187          * If an associated AP sta changed its antenna configuration, the state
 188          * will remain FULL_ON but SF parameters need to be reconsidered.
 189          */
 190         if (new_state != SF_FULL_ON && mvm->sf_state == new_state)
 191                 return 0;
 192
 193         switch (new_state) {
 194         case SF_UNINIT:
 195                 break;
 196         case SF_FULL_ON:
 197                 if (sta_id == IWL_MVM_STATION_COUNT) {
 198                         IWL_ERR(mvm,
 199                                 "No station: Cannot switch SF to FULL_ON\n");
 200                         return -EINVAL;
 201                 }
 202                 rcu_read_lock();
 203                 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
 204                 if (IS_ERR_OR_NULL(sta)) {
 205                         IWL_ERR(mvm, "Invalid station id\n");
 206                         rcu_read_unlock();
 207                         return -EINVAL;
 208                 }
 209                 iwl_mvm_fill_sf_command(&sf_cmd, sta);
 210                 rcu_read_unlock();
 211                 break;
 212         case SF_INIT_OFF:
 213                 iwl_mvm_fill_sf_command(&sf_cmd, NULL);
 214                 break;
 215         default:
 216                 WARN_ONCE(1, "Invalid state: %d. not sending Smart Fifo cmd\n",
 217                           new_state);
 218                 return -EINVAL;
 219         }
 220
 221         ret = iwl_mvm_send_cmd_pdu(mvm, REPLY_SF_CFG_CMD, CMD_ASYNC,
 222                                    sizeof(sf_cmd), &sf_cmd);
 223         if (!ret)
 224                 mvm->sf_state = new_state;
 225
 226         return ret;
 227 }
 228
 229 /*
 230  * Update Smart fifo:
 231  * Count bound interfaces that are not to be removed, ignoring p2p devices,
 232  * and set new state accordingly.
 233  */
 234 int iwl_mvm_sf_update(struct iwl_mvm *mvm, struct ieee80211_vif *changed_vif,
 235                       bool remove_vif)
 236 {
 237         enum iwl_sf_state new_state;
 238         u8 sta_id = IWL_MVM_STATION_COUNT;
 239         struct iwl_mvm_vif *mvmvif = NULL;
 240         struct iwl_mvm_active_iface_iterator_data data = {
 241                 .ignore_vif = changed_vif,
 242                 .sta_vif_state = SF_UNINIT,
 243                 .sta_vif_ap_sta_id = IWL_MVM_STATION_COUNT,
 244         };
 245
 246         /*
 247          * Ignore the call if we are in HW Restart flow, or if the handled
 248          * vif is a p2p device.
 249          */
 250         if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) ||
 251             (changed_vif && changed_vif->type == NL80211_IFTYPE_P2P_DEVICE))
 252                 return 0;
 253
 254         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 255                                                    IEEE80211_IFACE_ITER_NORMAL,
 256                                                    iwl_mvm_bound_iface_iterator,
 257                                                    &data);
 258
 259         /* If changed_vif exists and is not to be removed, add to the count */
 260         if (changed_vif && !remove_vif)
 261                 data.num_active_macs++;
 262
 263         switch (data.num_active_macs) {
 264         case 0:
 265                 /* If there are no active macs - change state to SF_INIT_OFF */
 266                 new_state = SF_INIT_OFF;
 267                 break;
 268         case 1:
 269                 if (remove_vif) {
 270                         /* The one active mac left is of type station
 271                          * and we filled the relevant data during iteration
 272                          */
 273                         new_state = data.sta_vif_state;
 274                         sta_id = data.sta_vif_ap_sta_id;
 275                 } else {
 276                         if (WARN_ON(!changed_vif))
 277                                 return -EINVAL;
 278                         if (changed_vif->type != NL80211_IFTYPE_STATION) {
 279                                 new_state = SF_UNINIT;
 280                         } else if (changed_vif->bss_conf.assoc &&
 281                                    changed_vif->bss_conf.dtim_period) {
 282                                 mvmvif = iwl_mvm_vif_from_mac80211(changed_vif);
 283                                 sta_id = mvmvif->ap_sta_id;
 284                                 new_state = SF_FULL_ON;
 285                         } else {
 286                                 new_state = SF_INIT_OFF;
 287                         }
 288                 }
 289                 break;
 290         default:
 291                 /* If there are multiple active macs - change to SF_UNINIT */
 292                 new_state = SF_UNINIT;
 293         }
 294         return iwl_mvm_sf_config(mvm, sta_id, new_state);
 295 }