drivers/net/wireless/intel/iwlwifi/mvm/quota.c

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  35  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  36  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  37  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
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  65  *
  66  *****************************************************************************/
  67
  68 #include <net/mac80211.h>
  69 #include "fw-api.h"
  70 #include "mvm.h"
  71
  72 #define QUOTA_100       IWL_MVM_MAX_QUOTA
  73 #define QUOTA_LOWLAT_MIN ((QUOTA_100 * IWL_MVM_LOWLAT_QUOTA_MIN_PERCENT) / 100)
  74
  75 struct iwl_mvm_quota_iterator_data {
  76         int n_interfaces[MAX_BINDINGS];
  77         int colors[MAX_BINDINGS];
  78         int low_latency[MAX_BINDINGS];
  79 #ifdef CONFIG_IWLWIFI_DEBUGFS
  80         int dbgfs_min[MAX_BINDINGS];
  81 #endif
  82         int n_low_latency_bindings;
  83         struct ieee80211_vif *disabled_vif;
  84 };
  85
  86 static void iwl_mvm_quota_iterator(void *_data, u8 *mac,
  87                                    struct ieee80211_vif *vif)
  88 {
  89         struct iwl_mvm_quota_iterator_data *data = _data;
  90         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
  91         u16 id;
  92
  93         /* skip disabled interfaces here immediately */
  94         if (vif == data->disabled_vif)
  95                 return;
  96
  97         if (!mvmvif->phy_ctxt)
  98                 return;
  99
 100         /* currently, PHY ID == binding ID */
 101         id = mvmvif->phy_ctxt->id;
 102
 103         /* need at least one binding per PHY */
 104         BUILD_BUG_ON(NUM_PHY_CTX > MAX_BINDINGS);
 105
 106         if (WARN_ON_ONCE(id >= MAX_BINDINGS))
 107                 return;
 108
 109         switch (vif->type) {
 110         case NL80211_IFTYPE_STATION:
 111                 if (vif->bss_conf.assoc)
 112                         break;
 113                 return;
 114         case NL80211_IFTYPE_AP:
 115         case NL80211_IFTYPE_ADHOC:
 116                 if (mvmvif->ap_ibss_active)
 117                         break;
 118                 return;
 119         case NL80211_IFTYPE_MONITOR:
 120                 if (mvmvif->monitor_active)
 121                         break;
 122                 return;
 123         case NL80211_IFTYPE_P2P_DEVICE:
 124                 return;
 125         default:
 126                 WARN_ON_ONCE(1);
 127                 return;
 128         }
 129
 130         if (data->colors[id] < 0)
 131                 data->colors[id] = mvmvif->phy_ctxt->color;
 132         else
 133                 WARN_ON_ONCE(data->colors[id] != mvmvif->phy_ctxt->color);
 134
 135         data->n_interfaces[id]++;
 136
 137 #ifdef CONFIG_IWLWIFI_DEBUGFS
 138         if (mvmvif->dbgfs_quota_min)
 139                 data->dbgfs_min[id] = max(data->dbgfs_min[id],
 140                                           mvmvif->dbgfs_quota_min);
 141 #endif
 142
 143         if (iwl_mvm_vif_low_latency(mvmvif) && !data->low_latency[id]) {
 144                 data->n_low_latency_bindings++;
 145                 data->low_latency[id] = true;
 146         }
 147 }
 148
 149 static void iwl_mvm_adjust_quota_for_noa(struct iwl_mvm *mvm,
 150                                          struct iwl_time_quota_cmd *cmd)
 151 {
 152 #ifdef CONFIG_NL80211_TESTMODE
 153         struct iwl_mvm_vif *mvmvif;
 154         int i, phy_id = -1, beacon_int = 0;
 155
 156         if (!mvm->noa_duration || !mvm->noa_vif)
 157                 return;
 158
 159         mvmvif = iwl_mvm_vif_from_mac80211(mvm->noa_vif);
 160         if (!mvmvif->ap_ibss_active)
 161                 return;
 162
 163         phy_id = mvmvif->phy_ctxt->id;
 164         beacon_int = mvm->noa_vif->bss_conf.beacon_int;
 165
 166         for (i = 0; i < MAX_BINDINGS; i++) {
 167                 struct iwl_time_quota_data *data =
 168                                         iwl_mvm_quota_cmd_get_quota(mvm, cmd,
 169                                                                     i);
 170                 u32 id_n_c = le32_to_cpu(data->id_and_color);
 171                 u32 id = (id_n_c & FW_CTXT_ID_MSK) >> FW_CTXT_ID_POS;
 172                 u32 quota = le32_to_cpu(data->quota);
 173
 174                 if (id != phy_id)
 175                         continue;
 176
 177                 quota *= (beacon_int - mvm->noa_duration);
 178                 quota /= beacon_int;
 179
 180                 IWL_DEBUG_QUOTA(mvm, "quota: adjust for NoA from %d to %d\n",
 181                                 le32_to_cpu(data->quota), quota);
 182
 183                 data->quota = cpu_to_le32(quota);
 184         }
 185 #endif
 186 }
 187
 188 int iwl_mvm_update_quotas(struct iwl_mvm *mvm,
 189                           bool force_update,
 190                           struct ieee80211_vif *disabled_vif)
 191 {
 192         struct iwl_time_quota_cmd cmd = {};
 193         int i, idx, err, num_active_macs, quota, quota_rem, n_non_lowlat;
 194         struct iwl_mvm_quota_iterator_data data = {
 195                 .n_interfaces = {},
 196                 .colors = { -1, -1, -1, -1 },
 197                 .disabled_vif = disabled_vif,
 198         };
 199         struct iwl_time_quota_cmd *last = &mvm->last_quota_cmd;
 200         struct iwl_time_quota_data *qdata, *last_data;
 201         bool send = false;
 202
 203         lockdep_assert_held(&mvm->mutex);
 204
 205         if (fw_has_capa(&mvm->fw->ucode_capa,
 206                         IWL_UCODE_TLV_CAPA_DYNAMIC_QUOTA))
 207                 return 0;
 208
 209         /* update all upon completion */
 210         if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
 211                 return 0;
 212
 213         /* iterator data above must match */
 214         BUILD_BUG_ON(MAX_BINDINGS != 4);
 215
 216         ieee80211_iterate_active_interfaces_atomic(
 217                 mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 218                 iwl_mvm_quota_iterator, &data);
 219
 220         /*
 221          * The FW's scheduling session consists of
 222          * IWL_MVM_MAX_QUOTA fragments. Divide these fragments
 223          * equally between all the bindings that require quota
 224          */
 225         num_active_macs = 0;
 226         for (i = 0; i < MAX_BINDINGS; i++) {
 227                 qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
 228                 qdata->id_and_color = cpu_to_le32(FW_CTXT_INVALID);
 229                 num_active_macs += data.n_interfaces[i];
 230         }
 231
 232         n_non_lowlat = num_active_macs;
 233
 234         if (data.n_low_latency_bindings == 1) {
 235                 for (i = 0; i < MAX_BINDINGS; i++) {
 236                         if (data.low_latency[i]) {
 237                                 n_non_lowlat -= data.n_interfaces[i];
 238                                 break;
 239                         }
 240                 }
 241         }
 242
 243         if (data.n_low_latency_bindings == 1 && n_non_lowlat) {
 244                 /*
 245                  * Reserve quota for the low latency binding in case that
 246                  * there are several data bindings but only a single
 247                  * low latency one. Split the rest of the quota equally
 248                  * between the other data interfaces.
 249                  */
 250                 quota = (QUOTA_100 - QUOTA_LOWLAT_MIN) / n_non_lowlat;
 251                 quota_rem = QUOTA_100 - n_non_lowlat * quota -
 252                             QUOTA_LOWLAT_MIN;
 253                 IWL_DEBUG_QUOTA(mvm,
 254                                 "quota: low-latency binding active, remaining quota per other binding: %d\n",
 255                                 quota);
 256         } else if (num_active_macs) {
 257                 /*
 258                  * There are 0 or more than 1 low latency bindings, or all the
 259                  * data interfaces belong to the single low latency binding.
 260                  * Split the quota equally between the data interfaces.
 261                  */
 262                 quota = QUOTA_100 / num_active_macs;
 263                 quota_rem = QUOTA_100 % num_active_macs;
 264                 IWL_DEBUG_QUOTA(mvm,
 265                                 "quota: splitting evenly per binding: %d\n",
 266                                 quota);
 267         } else {
 268                 /* values don't really matter - won't be used */
 269                 quota = 0;
 270                 quota_rem = 0;
 271         }
 272
 273         for (idx = 0, i = 0; i < MAX_BINDINGS; i++) {
 274                 if (data.colors[i] < 0)
 275                         continue;
 276
 277                 qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, idx);
 278
 279                 qdata->id_and_color =
 280                         cpu_to_le32(FW_CMD_ID_AND_COLOR(i, data.colors[i]));
 281
 282                 if (data.n_interfaces[i] <= 0)
 283                         qdata->quota = cpu_to_le32(0);
 284 #ifdef CONFIG_IWLWIFI_DEBUGFS
 285                 else if (data.dbgfs_min[i])
 286                         qdata->quota =
 287                                 cpu_to_le32(data.dbgfs_min[i] * QUOTA_100 / 100);
 288 #endif
 289                 else if (data.n_low_latency_bindings == 1 && n_non_lowlat &&
 290                          data.low_latency[i])
 291                         /*
 292                          * There is more than one binding, but only one of the
 293                          * bindings is in low latency. For this case, allocate
 294                          * the minimal required quota for the low latency
 295                          * binding.
 296                          */
 297                         qdata->quota = cpu_to_le32(QUOTA_LOWLAT_MIN);
 298                 else
 299                         qdata->quota =
 300                                 cpu_to_le32(quota * data.n_interfaces[i]);
 301
 302                 WARN_ONCE(le32_to_cpu(qdata->quota) > QUOTA_100,
 303                           "Binding=%d, quota=%u > max=%u\n",
 304                           idx, le32_to_cpu(qdata->quota), QUOTA_100);
 305
 306                 qdata->max_duration = cpu_to_le32(0);
 307
 308                 idx++;
 309         }
 310
 311         /* Give the remainder of the session to the first data binding */
 312         for (i = 0; i < MAX_BINDINGS; i++) {
 313                 qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
 314                 if (le32_to_cpu(qdata->quota) != 0) {
 315                         le32_add_cpu(&qdata->quota, quota_rem);
 316                         IWL_DEBUG_QUOTA(mvm,
 317                                         "quota: giving remainder of %d to binding %d\n",
 318                                         quota_rem, i);
 319                         break;
 320                 }
 321         }
 322
 323         iwl_mvm_adjust_quota_for_noa(mvm, &cmd);
 324
 325         /* check that we have non-zero quota for all valid bindings */
 326         for (i = 0; i < MAX_BINDINGS; i++) {
 327                 qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
 328                 last_data = iwl_mvm_quota_cmd_get_quota(mvm, last, i);
 329                 if (qdata->id_and_color != last_data->id_and_color)
 330                         send = true;
 331                 if (qdata->max_duration != last_data->max_duration)
 332                         send = true;
 333                 if (abs((int)le32_to_cpu(qdata->quota) -
 334                         (int)le32_to_cpu(last_data->quota))
 335                                                 > IWL_MVM_QUOTA_THRESHOLD)
 336                         send = true;
 337                 if (qdata->id_and_color == cpu_to_le32(FW_CTXT_INVALID))
 338                         continue;
 339                 WARN_ONCE(qdata->quota == 0,
 340                           "zero quota on binding %d\n", i);
 341         }
 342
 343         if (!send && !force_update) {
 344                 /* don't send a practically unchanged command, the firmware has
 345                  * to re-initialize a lot of state and that can have an adverse
 346                  * impact on it
 347                  */
 348                 return 0;
 349         }
 350
 351         err = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, 0,
 352                                    iwl_mvm_quota_cmd_size(mvm), &cmd);
 353
 354         if (err)
 355                 IWL_ERR(mvm, "Failed to send quota: %d\n", err);
 356         else
 357                 mvm->last_quota_cmd = cmd;
 358         return err;
 359 }