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

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   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
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  28  *  Intel Linux Wireless <ilw@linux.intel.com>
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  63
  64 #include <net/mac80211.h>
  65 #include "fw-api.h"
  66 #include "mvm.h"
  67
  68 #define QUOTA_100       IWL_MVM_MAX_QUOTA
  69 #define QUOTA_LOWLAT_MIN ((QUOTA_100 * IWL_MVM_LOWLAT_QUOTA_MIN_PERCENT) / 100)
  70
  71 struct iwl_mvm_quota_iterator_data {
  72         int n_interfaces[MAX_BINDINGS];
  73         int colors[MAX_BINDINGS];
  74         int low_latency[MAX_BINDINGS];
  75         int n_low_latency_bindings;
  76         struct ieee80211_vif *disabled_vif;
  77 };
  78
  79 static void iwl_mvm_quota_iterator(void *_data, u8 *mac,
  80                                    struct ieee80211_vif *vif)
  81 {
  82         struct iwl_mvm_quota_iterator_data *data = _data;
  83         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
  84         u16 id;
  85
  86         /* skip disabled interfaces here immediately */
  87         if (vif == data->disabled_vif)
  88                 return;
  89
  90         if (!mvmvif->phy_ctxt)
  91                 return;
  92
  93         /* currently, PHY ID == binding ID */
  94         id = mvmvif->phy_ctxt->id;
  95
  96         /* need at least one binding per PHY */
  97         BUILD_BUG_ON(NUM_PHY_CTX > MAX_BINDINGS);
  98
  99         if (WARN_ON_ONCE(id >= MAX_BINDINGS))
 100                 return;
 101
 102         switch (vif->type) {
 103         case NL80211_IFTYPE_STATION:
 104                 if (vif->bss_conf.assoc)
 105                         break;
 106                 return;
 107         case NL80211_IFTYPE_AP:
 108         case NL80211_IFTYPE_ADHOC:
 109                 if (mvmvif->ap_ibss_active)
 110                         break;
 111                 return;
 112         case NL80211_IFTYPE_MONITOR:
 113                 if (mvmvif->monitor_active)
 114                         break;
 115                 return;
 116         case NL80211_IFTYPE_P2P_DEVICE:
 117                 return;
 118         default:
 119                 WARN_ON_ONCE(1);
 120                 return;
 121         }
 122
 123         if (data->colors[id] < 0)
 124                 data->colors[id] = mvmvif->phy_ctxt->color;
 125         else
 126                 WARN_ON_ONCE(data->colors[id] != mvmvif->phy_ctxt->color);
 127
 128         data->n_interfaces[id]++;
 129
 130         if (iwl_mvm_vif_low_latency(mvmvif) && !data->low_latency[id]) {
 131                 data->n_low_latency_bindings++;
 132                 data->low_latency[id] = true;
 133         }
 134 }
 135
 136 static void iwl_mvm_adjust_quota_for_noa(struct iwl_mvm *mvm,
 137                                          struct iwl_time_quota_cmd *cmd)
 138 {
 139 #ifdef CONFIG_NL80211_TESTMODE
 140         struct iwl_mvm_vif *mvmvif;
 141         int i, phy_id = -1, beacon_int = 0;
 142
 143         if (!mvm->noa_duration || !mvm->noa_vif)
 144                 return;
 145
 146         mvmvif = iwl_mvm_vif_from_mac80211(mvm->noa_vif);
 147         if (!mvmvif->ap_ibss_active)
 148                 return;
 149
 150         phy_id = mvmvif->phy_ctxt->id;
 151         beacon_int = mvm->noa_vif->bss_conf.beacon_int;
 152
 153         for (i = 0; i < MAX_BINDINGS; i++) {
 154                 u32 id_n_c = le32_to_cpu(cmd->quotas[i].id_and_color);
 155                 u32 id = (id_n_c & FW_CTXT_ID_MSK) >> FW_CTXT_ID_POS;
 156                 u32 quota = le32_to_cpu(cmd->quotas[i].quota);
 157
 158                 if (id != phy_id)
 159                         continue;
 160
 161                 quota *= (beacon_int - mvm->noa_duration);
 162                 quota /= beacon_int;
 163
 164                 IWL_DEBUG_QUOTA(mvm, "quota: adjust for NoA from %d to %d\n",
 165                                 le32_to_cpu(cmd->quotas[i].quota), quota);
 166
 167                 cmd->quotas[i].quota = cpu_to_le32(quota);
 168         }
 169 #endif
 170 }
 171
 172 int iwl_mvm_update_quotas(struct iwl_mvm *mvm,
 173                           struct ieee80211_vif *disabled_vif)
 174 {
 175         struct iwl_time_quota_cmd cmd = {};
 176         int i, idx, ret, num_active_macs, quota, quota_rem, n_non_lowlat;
 177         struct iwl_mvm_quota_iterator_data data = {
 178                 .n_interfaces = {},
 179                 .colors = { -1, -1, -1, -1 },
 180                 .disabled_vif = disabled_vif,
 181         };
 182
 183         lockdep_assert_held(&mvm->mutex);
 184
 185         /* update all upon completion */
 186         if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
 187                 return 0;
 188
 189         /* iterator data above must match */
 190         BUILD_BUG_ON(MAX_BINDINGS != 4);
 191
 192         ieee80211_iterate_active_interfaces_atomic(
 193                 mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 194                 iwl_mvm_quota_iterator, &data);
 195
 196         /*
 197          * The FW's scheduling session consists of
 198          * IWL_MVM_MAX_QUOTA fragments. Divide these fragments
 199          * equally between all the bindings that require quota
 200          */
 201         num_active_macs = 0;
 202         for (i = 0; i < MAX_BINDINGS; i++) {
 203                 cmd.quotas[i].id_and_color = cpu_to_le32(FW_CTXT_INVALID);
 204                 num_active_macs += data.n_interfaces[i];
 205         }
 206
 207         n_non_lowlat = num_active_macs;
 208
 209         if (data.n_low_latency_bindings == 1) {
 210                 for (i = 0; i < MAX_BINDINGS; i++) {
 211                         if (data.low_latency[i]) {
 212                                 n_non_lowlat -= data.n_interfaces[i];
 213                                 break;
 214                         }
 215                 }
 216         }
 217
 218         if (data.n_low_latency_bindings == 1 && n_non_lowlat) {
 219                 /*
 220                  * Reserve quota for the low latency binding in case that
 221                  * there are several data bindings but only a single
 222                  * low latency one. Split the rest of the quota equally
 223                  * between the other data interfaces.
 224                  */
 225                 quota = (QUOTA_100 - QUOTA_LOWLAT_MIN) / n_non_lowlat;
 226                 quota_rem = QUOTA_100 - n_non_lowlat * quota -
 227                             QUOTA_LOWLAT_MIN;
 228                 IWL_DEBUG_QUOTA(mvm,
 229                                 "quota: low-latency binding active, remaining quota per other binding: %d\n",
 230                                 quota);
 231         } else if (num_active_macs) {
 232                 /*
 233                  * There are 0 or more than 1 low latency bindings, or all the
 234                  * data interfaces belong to the single low latency binding.
 235                  * Split the quota equally between the data interfaces.
 236                  */
 237                 quota = QUOTA_100 / num_active_macs;
 238                 quota_rem = QUOTA_100 % num_active_macs;
 239                 IWL_DEBUG_QUOTA(mvm,
 240                                 "quota: splitting evenly per binding: %d\n",
 241                                 quota);
 242         } else {
 243                 /* values don't really matter - won't be used */
 244                 quota = 0;
 245                 quota_rem = 0;
 246         }
 247
 248         for (idx = 0, i = 0; i < MAX_BINDINGS; i++) {
 249                 if (data.colors[i] < 0)
 250                         continue;
 251
 252                 cmd.quotas[idx].id_and_color =
 253                         cpu_to_le32(FW_CMD_ID_AND_COLOR(i, data.colors[i]));
 254
 255                 if (data.n_interfaces[i] <= 0)
 256                         cmd.quotas[idx].quota = cpu_to_le32(0);
 257                 else if (data.n_low_latency_bindings == 1 && n_non_lowlat &&
 258                          data.low_latency[i])
 259                         /*
 260                          * There is more than one binding, but only one of the
 261                          * bindings is in low latency. For this case, allocate
 262                          * the minimal required quota for the low latency
 263                          * binding.
 264                          */
 265                         cmd.quotas[idx].quota = cpu_to_le32(QUOTA_LOWLAT_MIN);
 266                 else
 267                         cmd.quotas[idx].quota =
 268                                 cpu_to_le32(quota * data.n_interfaces[i]);
 269
 270                 WARN_ONCE(le32_to_cpu(cmd.quotas[idx].quota) > QUOTA_100,
 271                           "Binding=%d, quota=%u > max=%u\n",
 272                           idx, le32_to_cpu(cmd.quotas[idx].quota), QUOTA_100);
 273
 274                 cmd.quotas[idx].max_duration = cpu_to_le32(0);
 275
 276                 idx++;
 277         }
 278
 279         /* Give the remainder of the session to the first data binding */
 280         for (i = 0; i < MAX_BINDINGS; i++) {
 281                 if (le32_to_cpu(cmd.quotas[i].quota) != 0) {
 282                         le32_add_cpu(&cmd.quotas[i].quota, quota_rem);
 283                         IWL_DEBUG_QUOTA(mvm,
 284                                         "quota: giving remainder of %d to binding %d\n",
 285                                         quota_rem, i);
 286                         break;
 287                 }
 288         }
 289
 290         iwl_mvm_adjust_quota_for_noa(mvm, &cmd);
 291
 292         /* check that we have non-zero quota for all valid bindings */
 293         for (i = 0; i < MAX_BINDINGS; i++) {
 294                 if (cmd.quotas[i].id_and_color == cpu_to_le32(FW_CTXT_INVALID))
 295                         continue;
 296                 WARN_ONCE(cmd.quotas[i].quota == 0,
 297                           "zero quota on binding %d\n", i);
 298         }
 299
 300         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, 0,
 301                                    sizeof(cmd), &cmd);
 302         if (ret)
 303                 IWL_ERR(mvm, "Failed to send quota: %d\n", ret);
 304         return ret;
 305 }