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

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   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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  65
  66 #include <net/mac80211.h>
  67 #include "fw-api.h"
  68 #include "mvm.h"
  69
  70 #define QUOTA_100       IWL_MVM_MAX_QUOTA
  71 #define QUOTA_LOWLAT_MIN ((QUOTA_100 * IWL_MVM_LOWLAT_QUOTA_MIN_PERCENT) / 100)
  72
  73 struct iwl_mvm_quota_iterator_data {
  74         int n_interfaces[MAX_BINDINGS];
  75         int colors[MAX_BINDINGS];
  76         int low_latency[MAX_BINDINGS];
  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         if (iwl_mvm_vif_low_latency(mvmvif) && !data->low_latency[id]) {
 133                 data->n_low_latency_bindings++;
 134                 data->low_latency[id] = true;
 135         }
 136 }
 137
 138 static void iwl_mvm_adjust_quota_for_noa(struct iwl_mvm *mvm,
 139                                          struct iwl_time_quota_cmd *cmd)
 140 {
 141 #ifdef CONFIG_NL80211_TESTMODE
 142         struct iwl_mvm_vif *mvmvif;
 143         int i, phy_id = -1, beacon_int = 0;
 144
 145         if (!mvm->noa_duration || !mvm->noa_vif)
 146                 return;
 147
 148         mvmvif = iwl_mvm_vif_from_mac80211(mvm->noa_vif);
 149         if (!mvmvif->ap_ibss_active)
 150                 return;
 151
 152         phy_id = mvmvif->phy_ctxt->id;
 153         beacon_int = mvm->noa_vif->bss_conf.beacon_int;
 154
 155         for (i = 0; i < MAX_BINDINGS; i++) {
 156                 u32 id_n_c = le32_to_cpu(cmd->quotas[i].id_and_color);
 157                 u32 id = (id_n_c & FW_CTXT_ID_MSK) >> FW_CTXT_ID_POS;
 158                 u32 quota = le32_to_cpu(cmd->quotas[i].quota);
 159
 160                 if (id != phy_id)
 161                         continue;
 162
 163                 quota *= (beacon_int - mvm->noa_duration);
 164                 quota /= beacon_int;
 165
 166                 IWL_DEBUG_QUOTA(mvm, "quota: adjust for NoA from %d to %d\n",
 167                                 le32_to_cpu(cmd->quotas[i].quota), quota);
 168
 169                 cmd->quotas[i].quota = cpu_to_le32(quota);
 170         }
 171 #endif
 172 }
 173
 174 int iwl_mvm_update_quotas(struct iwl_mvm *mvm,
 175                           struct ieee80211_vif *disabled_vif)
 176 {
 177         struct iwl_time_quota_cmd cmd = {};
 178         int i, idx, err, num_active_macs, quota, quota_rem, n_non_lowlat;
 179         struct iwl_mvm_quota_iterator_data data = {
 180                 .n_interfaces = {},
 181                 .colors = { -1, -1, -1, -1 },
 182                 .disabled_vif = disabled_vif,
 183         };
 184         struct iwl_time_quota_cmd *last = &mvm->last_quota_cmd;
 185         bool send = false;
 186
 187         lockdep_assert_held(&mvm->mutex);
 188
 189         /* update all upon completion */
 190         if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
 191                 return 0;
 192
 193         /* iterator data above must match */
 194         BUILD_BUG_ON(MAX_BINDINGS != 4);
 195
 196         ieee80211_iterate_active_interfaces_atomic(
 197                 mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 198                 iwl_mvm_quota_iterator, &data);
 199
 200         /*
 201          * The FW's scheduling session consists of
 202          * IWL_MVM_MAX_QUOTA fragments. Divide these fragments
 203          * equally between all the bindings that require quota
 204          */
 205         num_active_macs = 0;
 206         for (i = 0; i < MAX_BINDINGS; i++) {
 207                 cmd.quotas[i].id_and_color = cpu_to_le32(FW_CTXT_INVALID);
 208                 num_active_macs += data.n_interfaces[i];
 209         }
 210
 211         n_non_lowlat = num_active_macs;
 212
 213         if (data.n_low_latency_bindings == 1) {
 214                 for (i = 0; i < MAX_BINDINGS; i++) {
 215                         if (data.low_latency[i]) {
 216                                 n_non_lowlat -= data.n_interfaces[i];
 217                                 break;
 218                         }
 219                 }
 220         }
 221
 222         if (data.n_low_latency_bindings == 1 && n_non_lowlat) {
 223                 /*
 224                  * Reserve quota for the low latency binding in case that
 225                  * there are several data bindings but only a single
 226                  * low latency one. Split the rest of the quota equally
 227                  * between the other data interfaces.
 228                  */
 229                 quota = (QUOTA_100 - QUOTA_LOWLAT_MIN) / n_non_lowlat;
 230                 quota_rem = QUOTA_100 - n_non_lowlat * quota -
 231                             QUOTA_LOWLAT_MIN;
 232                 IWL_DEBUG_QUOTA(mvm,
 233                                 "quota: low-latency binding active, remaining quota per other binding: %d\n",
 234                                 quota);
 235         } else if (num_active_macs) {
 236                 /*
 237                  * There are 0 or more than 1 low latency bindings, or all the
 238                  * data interfaces belong to the single low latency binding.
 239                  * Split the quota equally between the data interfaces.
 240                  */
 241                 quota = QUOTA_100 / num_active_macs;
 242                 quota_rem = QUOTA_100 % num_active_macs;
 243                 IWL_DEBUG_QUOTA(mvm,
 244                                 "quota: splitting evenly per binding: %d\n",
 245                                 quota);
 246         } else {
 247                 /* values don't really matter - won't be used */
 248                 quota = 0;
 249                 quota_rem = 0;
 250         }
 251
 252         for (idx = 0, i = 0; i < MAX_BINDINGS; i++) {
 253                 if (data.colors[i] < 0)
 254                         continue;
 255
 256                 cmd.quotas[idx].id_and_color =
 257                         cpu_to_le32(FW_CMD_ID_AND_COLOR(i, data.colors[i]));
 258
 259                 if (data.n_interfaces[i] <= 0)
 260                         cmd.quotas[idx].quota = cpu_to_le32(0);
 261                 else if (data.n_low_latency_bindings == 1 && n_non_lowlat &&
 262                          data.low_latency[i])
 263                         /*
 264                          * There is more than one binding, but only one of the
 265                          * bindings is in low latency. For this case, allocate
 266                          * the minimal required quota for the low latency
 267                          * binding.
 268                          */
 269                         cmd.quotas[idx].quota = cpu_to_le32(QUOTA_LOWLAT_MIN);
 270                 else
 271                         cmd.quotas[idx].quota =
 272                                 cpu_to_le32(quota * data.n_interfaces[i]);
 273
 274                 WARN_ONCE(le32_to_cpu(cmd.quotas[idx].quota) > QUOTA_100,
 275                           "Binding=%d, quota=%u > max=%u\n",
 276                           idx, le32_to_cpu(cmd.quotas[idx].quota), QUOTA_100);
 277
 278                 cmd.quotas[idx].max_duration = cpu_to_le32(0);
 279
 280                 idx++;
 281         }
 282
 283         /* Give the remainder of the session to the first data binding */
 284         for (i = 0; i < MAX_BINDINGS; i++) {
 285                 if (le32_to_cpu(cmd.quotas[i].quota) != 0) {
 286                         le32_add_cpu(&cmd.quotas[i].quota, quota_rem);
 287                         IWL_DEBUG_QUOTA(mvm,
 288                                         "quota: giving remainder of %d to binding %d\n",
 289                                         quota_rem, i);
 290                         break;
 291                 }
 292         }
 293
 294         iwl_mvm_adjust_quota_for_noa(mvm, &cmd);
 295
 296         /* check that we have non-zero quota for all valid bindings */
 297         for (i = 0; i < MAX_BINDINGS; i++) {
 298                 if (cmd.quotas[i].id_and_color != last->quotas[i].id_and_color)
 299                         send = true;
 300                 if (cmd.quotas[i].max_duration != last->quotas[i].max_duration)
 301                         send = true;
 302                 if (abs((int)le32_to_cpu(cmd.quotas[i].quota) -
 303                         (int)le32_to_cpu(last->quotas[i].quota))
 304                                                 > IWL_MVM_QUOTA_THRESHOLD)
 305                         send = true;
 306                 if (cmd.quotas[i].id_and_color == cpu_to_le32(FW_CTXT_INVALID))
 307                         continue;
 308                 WARN_ONCE(cmd.quotas[i].quota == 0,
 309                           "zero quota on binding %d\n", i);
 310         }
 311
 312         if (send) {
 313                 err = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, 0,
 314                                            sizeof(cmd), &cmd);
 315         } else {
 316                 /* don't send a practically unchanged command, the firmware has
 317                  * to re-initialize a lot of state and that can have an adverse
 318                  * impact on it
 319                  */
 320                 err = 0;
 321         }
 322
 323         if (err)
 324                 IWL_ERR(mvm, "Failed to send quota: %d\n", err);
 325         else
 326                 mvm->last_quota_cmd = cmd;
 327         return err;
 328 }