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

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