drivers/net/wireless/intel/iwlwifi/mvm/quota.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) 2012 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  10  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of version 2 of the GNU General Public License as
  14  * published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called COPYING.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <linuxwifi@intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  * BSD LICENSE
  29  *
  30  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  31  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  32  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  33  * All rights reserved.
  34  *
  35  * Redistribution and use in source and binary forms, with or without
  36  * modification, are permitted provided that the following conditions
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  40  *    notice, this list of conditions and the following disclaimer.
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  43  *    the documentation and/or other materials provided with the
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  45  *  * Neither the name Intel Corporation nor the names of its
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  47  *    from this software without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  50  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  51  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  52  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  53  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  54  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  55  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  56  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  58  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  59  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  60  *
  61  *****************************************************************************/
  62
  63 #include <net/mac80211.h>
  64 #include "fw-api.h"
  65 #include "mvm.h"
  66
  67 #define QUOTA_100       IWL_MVM_MAX_QUOTA
  68 #define QUOTA_LOWLAT_MIN ((QUOTA_100 * IWL_MVM_LOWLAT_QUOTA_MIN_PERCENT) / 100)
  69
  70 struct iwl_mvm_quota_iterator_data {
  71         int n_interfaces[MAX_BINDINGS];
  72         int colors[MAX_BINDINGS];
  73         int low_latency[MAX_BINDINGS];
  74 #ifdef CONFIG_IWLWIFI_DEBUGFS
  75         int dbgfs_min[MAX_BINDINGS];
  76 #endif
  77         int n_low_latency_bindings;
  78         struct ieee80211_vif *disabled_vif;
  79 };
  80
  81 static void iwl_mvm_quota_iterator(void *_data, u8 *mac,
  82                                    struct ieee80211_vif *vif)
  83 {
  84         struct iwl_mvm_quota_iterator_data *data = _data;
  85         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
  86         u16 id;
  87
  88         /* skip disabled interfaces here immediately */
  89         if (vif == data->disabled_vif)
  90                 return;
  91
  92         if (!mvmvif->phy_ctxt)
  93                 return;
  94
  95         /* currently, PHY ID == binding ID */
  96         id = mvmvif->phy_ctxt->id;
  97
  98         /* need at least one binding per PHY */
  99         BUILD_BUG_ON(NUM_PHY_CTX > MAX_BINDINGS);
 100
 101         if (WARN_ON_ONCE(id >= MAX_BINDINGS))
 102                 return;
 103
 104         switch (vif->type) {
 105         case NL80211_IFTYPE_STATION:
 106                 if (vif->bss_conf.assoc)
 107                         break;
 108                 return;
 109         case NL80211_IFTYPE_AP:
 110         case NL80211_IFTYPE_ADHOC:
 111                 if (mvmvif->ap_ibss_active)
 112                         break;
 113                 return;
 114         case NL80211_IFTYPE_MONITOR:
 115                 if (mvmvif->monitor_active)
 116                         break;
 117                 return;
 118         case NL80211_IFTYPE_P2P_DEVICE:
 119                 return;
 120         default:
 121                 WARN_ON_ONCE(1);
 122                 return;
 123         }
 124
 125         if (data->colors[id] < 0)
 126                 data->colors[id] = mvmvif->phy_ctxt->color;
 127         else
 128                 WARN_ON_ONCE(data->colors[id] != mvmvif->phy_ctxt->color);
 129
 130         data->n_interfaces[id]++;
 131
 132 #ifdef CONFIG_IWLWIFI_DEBUGFS
 133         if (mvmvif->dbgfs_quota_min)
 134                 data->dbgfs_min[id] = max(data->dbgfs_min[id],
 135                                           mvmvif->dbgfs_quota_min);
 136 #endif
 137
 138         if (iwl_mvm_vif_low_latency(mvmvif) && !data->low_latency[id]) {
 139                 data->n_low_latency_bindings++;
 140                 data->low_latency[id] = true;
 141         }
 142 }
 143
 144 static void iwl_mvm_adjust_quota_for_noa(struct iwl_mvm *mvm,
 145                                          struct iwl_time_quota_cmd *cmd)
 146 {
 147 #ifdef CONFIG_NL80211_TESTMODE
 148         struct iwl_mvm_vif *mvmvif;
 149         int i, phy_id = -1, beacon_int = 0;
 150
 151         if (!mvm->noa_duration || !mvm->noa_vif)
 152                 return;
 153
 154         mvmvif = iwl_mvm_vif_from_mac80211(mvm->noa_vif);
 155         if (!mvmvif->ap_ibss_active)
 156                 return;
 157
 158         phy_id = mvmvif->phy_ctxt->id;
 159         beacon_int = mvm->noa_vif->bss_conf.beacon_int;
 160
 161         for (i = 0; i < MAX_BINDINGS; i++) {
 162                 struct iwl_time_quota_data *data =
 163                                         iwl_mvm_quota_cmd_get_quota(mvm, cmd,
 164                                                                     i);
 165                 u32 id_n_c = le32_to_cpu(data->id_and_color);
 166                 u32 id = (id_n_c & FW_CTXT_ID_MSK) >> FW_CTXT_ID_POS;
 167                 u32 quota = le32_to_cpu(data->quota);
 168
 169                 if (id != phy_id)
 170                         continue;
 171
 172                 quota *= (beacon_int - mvm->noa_duration);
 173                 quota /= beacon_int;
 174
 175                 IWL_DEBUG_QUOTA(mvm, "quota: adjust for NoA from %d to %d\n",
 176                                 le32_to_cpu(data->quota), quota);
 177
 178                 data->quota = cpu_to_le32(quota);
 179         }
 180 #endif
 181 }
 182
 183 int iwl_mvm_update_quotas(struct iwl_mvm *mvm,
 184                           bool force_update,
 185                           struct ieee80211_vif *disabled_vif)
 186 {
 187         struct iwl_time_quota_cmd cmd = {};
 188         int i, idx, err, num_active_macs, quota, quota_rem, n_non_lowlat;
 189         struct iwl_mvm_quota_iterator_data data = {
 190                 .n_interfaces = {},
 191                 .colors = { -1, -1, -1, -1 },
 192                 .disabled_vif = disabled_vif,
 193         };
 194         struct iwl_time_quota_cmd *last = &mvm->last_quota_cmd;
 195         struct iwl_time_quota_data *qdata, *last_data;
 196         bool send = false;
 197
 198         lockdep_assert_held(&mvm->mutex);
 199
 200         if (fw_has_capa(&mvm->fw->ucode_capa,
 201                         IWL_UCODE_TLV_CAPA_DYNAMIC_QUOTA))
 202                 return 0;
 203
 204         /* update all upon completion */
 205         if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
 206                 return 0;
 207
 208         /* iterator data above must match */
 209         BUILD_BUG_ON(MAX_BINDINGS != 4);
 210
 211         ieee80211_iterate_active_interfaces_atomic(
 212                 mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 213                 iwl_mvm_quota_iterator, &data);
 214
 215         /*
 216          * The FW's scheduling session consists of
 217          * IWL_MVM_MAX_QUOTA fragments. Divide these fragments
 218          * equally between all the bindings that require quota
 219          */
 220         num_active_macs = 0;
 221         for (i = 0; i < MAX_BINDINGS; i++) {
 222                 qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
 223                 qdata->id_and_color = cpu_to_le32(FW_CTXT_INVALID);
 224                 num_active_macs += data.n_interfaces[i];
 225         }
 226
 227         n_non_lowlat = num_active_macs;
 228
 229         if (data.n_low_latency_bindings == 1) {
 230                 for (i = 0; i < MAX_BINDINGS; i++) {
 231                         if (data.low_latency[i]) {
 232                                 n_non_lowlat -= data.n_interfaces[i];
 233                                 break;
 234                         }
 235                 }
 236         }
 237
 238         if (data.n_low_latency_bindings == 1 && n_non_lowlat) {
 239                 /*
 240                  * Reserve quota for the low latency binding in case that
 241                  * there are several data bindings but only a single
 242                  * low latency one. Split the rest of the quota equally
 243                  * between the other data interfaces.
 244                  */
 245                 quota = (QUOTA_100 - QUOTA_LOWLAT_MIN) / n_non_lowlat;
 246                 quota_rem = QUOTA_100 - n_non_lowlat * quota -
 247                             QUOTA_LOWLAT_MIN;
 248                 IWL_DEBUG_QUOTA(mvm,
 249                                 "quota: low-latency binding active, remaining quota per other binding: %d\n",
 250                                 quota);
 251         } else if (num_active_macs) {
 252                 /*
 253                  * There are 0 or more than 1 low latency bindings, or all the
 254                  * data interfaces belong to the single low latency binding.
 255                  * Split the quota equally between the data interfaces.
 256                  */
 257                 quota = QUOTA_100 / num_active_macs;
 258                 quota_rem = QUOTA_100 % num_active_macs;
 259                 IWL_DEBUG_QUOTA(mvm,
 260                                 "quota: splitting evenly per binding: %d\n",
 261                                 quota);
 262         } else {
 263                 /* values don't really matter - won't be used */
 264                 quota = 0;
 265                 quota_rem = 0;
 266         }
 267
 268         for (idx = 0, i = 0; i < MAX_BINDINGS; i++) {
 269                 if (data.colors[i] < 0)
 270                         continue;
 271
 272                 qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, idx);
 273
 274                 qdata->id_and_color =
 275                         cpu_to_le32(FW_CMD_ID_AND_COLOR(i, data.colors[i]));
 276
 277                 if (data.n_interfaces[i] <= 0)
 278                         qdata->quota = cpu_to_le32(0);
 279 #ifdef CONFIG_IWLWIFI_DEBUGFS
 280                 else if (data.dbgfs_min[i])
 281                         qdata->quota =
 282                                 cpu_to_le32(data.dbgfs_min[i] * QUOTA_100 / 100);
 283 #endif
 284                 else if (data.n_low_latency_bindings == 1 && n_non_lowlat &&
 285                          data.low_latency[i])
 286                         /*
 287                          * There is more than one binding, but only one of the
 288                          * bindings is in low latency. For this case, allocate
 289                          * the minimal required quota for the low latency
 290                          * binding.
 291                          */
 292                         qdata->quota = cpu_to_le32(QUOTA_LOWLAT_MIN);
 293                 else
 294                         qdata->quota =
 295                                 cpu_to_le32(quota * data.n_interfaces[i]);
 296
 297                 WARN_ONCE(le32_to_cpu(qdata->quota) > QUOTA_100,
 298                           "Binding=%d, quota=%u > max=%u\n",
 299                           idx, le32_to_cpu(qdata->quota), QUOTA_100);
 300
 301                 qdata->max_duration = cpu_to_le32(0);
 302
 303                 idx++;
 304         }
 305
 306         /* Give the remainder of the session to the first data binding */
 307         for (i = 0; i < MAX_BINDINGS; i++) {
 308                 qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
 309                 if (le32_to_cpu(qdata->quota) != 0) {
 310                         le32_add_cpu(&qdata->quota, quota_rem);
 311                         IWL_DEBUG_QUOTA(mvm,
 312                                         "quota: giving remainder of %d to binding %d\n",
 313                                         quota_rem, i);
 314                         break;
 315                 }
 316         }
 317
 318         iwl_mvm_adjust_quota_for_noa(mvm, &cmd);
 319
 320         /* check that we have non-zero quota for all valid bindings */
 321         for (i = 0; i < MAX_BINDINGS; i++) {
 322                 qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
 323                 last_data = iwl_mvm_quota_cmd_get_quota(mvm, last, i);
 324                 if (qdata->id_and_color != last_data->id_and_color)
 325                         send = true;
 326                 if (qdata->max_duration != last_data->max_duration)
 327                         send = true;
 328                 if (abs((int)le32_to_cpu(qdata->quota) -
 329                         (int)le32_to_cpu(last_data->quota))
 330                                                 > IWL_MVM_QUOTA_THRESHOLD)
 331                         send = true;
 332                 if (qdata->id_and_color == cpu_to_le32(FW_CTXT_INVALID))
 333                         continue;
 334                 WARN_ONCE(qdata->quota == 0,
 335                           "zero quota on binding %d\n", i);
 336         }
 337
 338         if (!send && !force_update) {
 339                 /* don't send a practically unchanged command, the firmware has
 340                  * to re-initialize a lot of state and that can have an adverse
 341                  * impact on it
 342                  */
 343                 return 0;
 344         }
 345
 346         err = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, 0,
 347                                    iwl_mvm_quota_cmd_size(mvm), &cmd);
 348
 349         if (err)
 350                 IWL_ERR(mvm, "Failed to send quota: %d\n", err);
 351         else
 352                 mvm->last_quota_cmd = cmd;
 353         return err;
 354 }