LXR linux/drivers/net/wireless/intel/iwlwifi/mvm/sf.c

   1/******************************************************************************
   2 *
   3 * This file is provided under a dual BSD/GPLv2 license.  When using or
   4 * redistributing this file, you may do so under either license.
   5 *
   6 * GPL LICENSE SUMMARY
   7 *
   8 * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
   9 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of version 2 of the GNU General Public License as
  13 * published by the Free Software Foundation.
  14 *
  15 * This program is distributed in the hope that it will be useful, but
  16 * WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18 * General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  23 * USA
  24 *
  25 * The full GNU General Public License is included in this distribution
  26 * in the file called COPYING.
  27 *
  28 * Contact Information:
  29 *  Intel Linux Wireless <linuxwifi@intel.com>
  30 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  31 *
  32 * BSD LICENSE
  33 *
  34 * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
  35 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  36 * All rights reserved.
  37 *
  38 * Redistribution and use in source and binary forms, with or without
  39 * modification, are permitted provided that the following conditions
  40 * are met:
  41 *
  42 *  * Redistributions of source code must retain the above copyright
  43 *    notice, this list of conditions and the following disclaimer.
  44 *  * Redistributions in binary form must reproduce the above copyright
  45 *    notice, this list of conditions and the following disclaimer in
  46 *    the documentation and/or other materials provided with the
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  48 *  * Neither the name Intel Corporation nor the names of its
  49 *    contributors may be used to endorse or promote products derived
  50 *    from this software without specific prior written permission.
  51 *
  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
  58 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  59 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  60 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  61 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  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 */
  68struct 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 */
  79static 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 default configuration
 103 */
 104static const
 105__le32 sf_full_timeout_def[SF_NUM_SCENARIO][SF_NUM_TIMEOUT_TYPES] = {
 106        {
 107                cpu_to_le32(SF_SINGLE_UNICAST_AGING_TIMER_DEF),
 108                cpu_to_le32(SF_SINGLE_UNICAST_IDLE_TIMER_DEF)
 109        },
 110        {
 111                cpu_to_le32(SF_AGG_UNICAST_AGING_TIMER_DEF),
 112                cpu_to_le32(SF_AGG_UNICAST_IDLE_TIMER_DEF)
 113        },
 114        {
 115                cpu_to_le32(SF_MCAST_AGING_TIMER_DEF),
 116                cpu_to_le32(SF_MCAST_IDLE_TIMER_DEF)
 117        },
 118        {
 119                cpu_to_le32(SF_BA_AGING_TIMER_DEF),
 120                cpu_to_le32(SF_BA_IDLE_TIMER_DEF)
 121        },
 122        {
 123                cpu_to_le32(SF_TX_RE_AGING_TIMER_DEF),
 124                cpu_to_le32(SF_TX_RE_IDLE_TIMER_DEF)
 125        },
 126};
 127
 128/*
 129 * Aging and idle timeouts for the different possible scenarios
 130 * in single BSS MAC configuration.
 131 */
 132static const __le32 sf_full_timeout[SF_NUM_SCENARIO][SF_NUM_TIMEOUT_TYPES] = {
 133        {
 134                cpu_to_le32(SF_SINGLE_UNICAST_AGING_TIMER),
 135                cpu_to_le32(SF_SINGLE_UNICAST_IDLE_TIMER)
 136        },
 137        {
 138                cpu_to_le32(SF_AGG_UNICAST_AGING_TIMER),
 139                cpu_to_le32(SF_AGG_UNICAST_IDLE_TIMER)
 140        },
 141        {
 142                cpu_to_le32(SF_MCAST_AGING_TIMER),
 143                cpu_to_le32(SF_MCAST_IDLE_TIMER)
 144        },
 145        {
 146                cpu_to_le32(SF_BA_AGING_TIMER),
 147                cpu_to_le32(SF_BA_IDLE_TIMER)
 148        },
 149        {
 150                cpu_to_le32(SF_TX_RE_AGING_TIMER),
 151                cpu_to_le32(SF_TX_RE_IDLE_TIMER)
 152        },
 153};
 154
 155static void iwl_mvm_fill_sf_command(struct iwl_mvm *mvm,
 156                                    struct iwl_sf_cfg_cmd *sf_cmd,
 157                                    struct ieee80211_sta *sta)
 158{
 159        int i, j, watermark;
 160
 161        sf_cmd->watermark[SF_LONG_DELAY_ON] = cpu_to_le32(SF_W_MARK_SCAN);
 162
 163        /*
 164         * If we are in association flow - check antenna configuration
 165         * capabilities of the AP station, and choose the watermark accordingly.
 166         */
 167        if (sta) {
 168                if (sta->ht_cap.ht_supported || sta->vht_cap.vht_supported) {
 169                        switch (sta->rx_nss) {
 170                        case 1:
 171                                watermark = SF_W_MARK_SISO;
 172                                break;
 173                        case 2:
 174                                watermark = SF_W_MARK_MIMO2;
 175                                break;
 176                        default:
 177                                watermark = SF_W_MARK_MIMO3;
 178                                break;
 179                        }
 180                } else {
 181                        watermark = SF_W_MARK_LEGACY;
 182                }
 183        /* default watermark value for unassociated mode. */
 184        } else {
 185                watermark = SF_W_MARK_MIMO2;
 186        }
 187        sf_cmd->watermark[SF_FULL_ON] = cpu_to_le32(watermark);
 188
 189        for (i = 0; i < SF_NUM_SCENARIO; i++) {
 190                for (j = 0; j < SF_NUM_TIMEOUT_TYPES; j++) {
 191                        sf_cmd->long_delay_timeouts[i][j] =
 192                                        cpu_to_le32(SF_LONG_DELAY_AGING_TIMER);
 193                }
 194        }
 195
 196        if (sta) {
 197                BUILD_BUG_ON(sizeof(sf_full_timeout) !=
 198                             sizeof(__le32) * SF_NUM_SCENARIO *
 199                             SF_NUM_TIMEOUT_TYPES);
 200
 201                memcpy(sf_cmd->full_on_timeouts, sf_full_timeout,
 202                       sizeof(sf_full_timeout));
 203        } else {
 204                BUILD_BUG_ON(sizeof(sf_full_timeout_def) !=
 205                             sizeof(__le32) * SF_NUM_SCENARIO *
 206                             SF_NUM_TIMEOUT_TYPES);
 207
 208                memcpy(sf_cmd->full_on_timeouts, sf_full_timeout_def,
 209                       sizeof(sf_full_timeout_def));
 210        }
 211
 212}
 213
 214static int iwl_mvm_sf_config(struct iwl_mvm *mvm, u8 sta_id,
 215                             enum iwl_sf_state new_state)
 216{
 217        struct iwl_sf_cfg_cmd sf_cmd = {
 218                .state = cpu_to_le32(new_state),
 219        };
 220        struct ieee80211_sta *sta;
 221        int ret = 0;
 222
 223        if (mvm->cfg->disable_dummy_notification)
 224                sf_cmd.state |= cpu_to_le32(SF_CFG_DUMMY_NOTIF_OFF);
 225
 226        /*
 227         * If an associated AP sta changed its antenna configuration, the state
 228         * will remain FULL_ON but SF parameters need to be reconsidered.
 229         */
 230        if (new_state != SF_FULL_ON && mvm->sf_state == new_state)
 231                return 0;
 232
 233        switch (new_state) {
 234        case SF_UNINIT:
 235                iwl_mvm_fill_sf_command(mvm, &sf_cmd, NULL);
 236                break;
 237        case SF_FULL_ON:
 238                if (sta_id == IWL_MVM_INVALID_STA) {
 239                        IWL_ERR(mvm,
 240                                "No station: Cannot switch SF to FULL_ON\n");
 241                        return -EINVAL;
 242                }
 243                rcu_read_lock();
 244                sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
 245                if (IS_ERR_OR_NULL(sta)) {
 246                        IWL_ERR(mvm, "Invalid station id\n");
 247                        rcu_read_unlock();
 248                        return -EINVAL;
 249                }
 250                iwl_mvm_fill_sf_command(mvm, &sf_cmd, sta);
 251                rcu_read_unlock();
 252                break;
 253        case SF_INIT_OFF:
 254                iwl_mvm_fill_sf_command(mvm, &sf_cmd, NULL);
 255                break;
 256        default:
 257                WARN_ONCE(1, "Invalid state: %d. not sending Smart Fifo cmd\n",
 258                          new_state);
 259                return -EINVAL;
 260        }
 261
 262        ret = iwl_mvm_send_cmd_pdu(mvm, REPLY_SF_CFG_CMD, CMD_ASYNC,
 263                                   sizeof(sf_cmd), &sf_cmd);
 264        if (!ret)
 265                mvm->sf_state = new_state;
 266
 267        return ret;
 268}
 269
 270/*
 271 * Update Smart fifo:
 272 * Count bound interfaces that are not to be removed, ignoring p2p devices,
 273 * and set new state accordingly.
 274 */
 275int iwl_mvm_sf_update(struct iwl_mvm *mvm, struct ieee80211_vif *changed_vif,
 276                      bool remove_vif)
 277{
 278        enum iwl_sf_state new_state;
 279        u8 sta_id = IWL_MVM_INVALID_STA;
 280        struct iwl_mvm_vif *mvmvif = NULL;
 281        struct iwl_mvm_active_iface_iterator_data data = {
 282                .ignore_vif = changed_vif,
 283                .sta_vif_state = SF_UNINIT,
 284                .sta_vif_ap_sta_id = IWL_MVM_INVALID_STA,
 285        };
 286
 287        /*
 288         * Ignore the call if we are in HW Restart flow, or if the handled
 289         * vif is a p2p device.
 290         */
 291        if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) ||
 292            (changed_vif && changed_vif->type == NL80211_IFTYPE_P2P_DEVICE))
 293                return 0;
 294
 295        ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 296                                                   IEEE80211_IFACE_ITER_NORMAL,
 297                                                   iwl_mvm_bound_iface_iterator,
 298                                                   &data);
 299
 300        /* If changed_vif exists and is not to be removed, add to the count */
 301        if (changed_vif && !remove_vif)
 302                data.num_active_macs++;
 303
 304        switch (data.num_active_macs) {
 305        case 0:
 306                /* If there are no active macs - change state to SF_INIT_OFF */
 307                new_state = SF_INIT_OFF;
 308                break;
 309        case 1:
 310                if (remove_vif) {
 311                        /* The one active mac left is of type station
 312                         * and we filled the relevant data during iteration
 313                         */
 314                        new_state = data.sta_vif_state;
 315                        sta_id = data.sta_vif_ap_sta_id;
 316                } else {
 317                        if (WARN_ON(!changed_vif))
 318                                return -EINVAL;
 319                        if (changed_vif->type != NL80211_IFTYPE_STATION) {
 320                                new_state = SF_UNINIT;
 321                        } else if (changed_vif->bss_conf.assoc &&
 322                                   changed_vif->bss_conf.dtim_period) {
 323                                mvmvif = iwl_mvm_vif_from_mac80211(changed_vif);
 324                                sta_id = mvmvif->ap_sta_id;
 325                                new_state = SF_FULL_ON;
 326                        } else {
 327                                new_state = SF_INIT_OFF;
 328                        }
 329                }
 330                break;
 331        default:
 332                /* If there are multiple active macs - change to SF_UNINIT */
 333                new_state = SF_UNINIT;
 334        }
 335        return iwl_mvm_sf_config(mvm, sta_id, new_state);
 336}
 337