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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  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 *new_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         /*
  87          * We'll account for the new interface (if any) below,
  88          * skip it here in case we're not called from within
  89          * the add_interface callback (otherwise it won't show
  90          * up in iteration)
  91          */
  92         if (vif == data->new_vif)
  93                 return;
  94
  95         if (!mvmvif->phy_ctxt)
  96                 return;
  97
  98         /* currently, PHY ID == binding ID */
  99         id = mvmvif->phy_ctxt->id;
 100
 101         /* need at least one binding per PHY */
 102         BUILD_BUG_ON(NUM_PHY_CTX > MAX_BINDINGS);
 103
 104         if (WARN_ON_ONCE(id >= MAX_BINDINGS))
 105                 return;
 106
 107         if (data->colors[id] < 0)
 108                 data->colors[id] = mvmvif->phy_ctxt->color;
 109         else
 110                 WARN_ON_ONCE(data->colors[id] != mvmvif->phy_ctxt->color);
 111
 112         switch (vif->type) {
 113         case NL80211_IFTYPE_STATION:
 114                 if (vif->bss_conf.assoc)
 115                         break;
 116                 return;
 117         case NL80211_IFTYPE_AP:
 118         case NL80211_IFTYPE_ADHOC:
 119                 if (mvmvif->ap_ibss_active)
 120                         break;
 121                 return;
 122         case NL80211_IFTYPE_MONITOR:
 123                 if (mvmvif->monitor_active)
 124                         break;
 125                 return;
 126         case NL80211_IFTYPE_P2P_DEVICE:
 127                 return;
 128         default:
 129                 WARN_ON_ONCE(1);
 130                 return;
 131         }
 132
 133         data->n_interfaces[id]++;
 134
 135         if (iwl_mvm_vif_low_latency(mvmvif) && !data->low_latency[id]) {
 136                 data->n_low_latency_bindings++;
 137                 data->low_latency[id] = true;
 138         }
 139 }
 140
 141 static void iwl_mvm_adjust_quota_for_noa(struct iwl_mvm *mvm,
 142                                          struct iwl_time_quota_cmd *cmd)
 143 {
 144 #ifdef CONFIG_NL80211_TESTMODE
 145         struct iwl_mvm_vif *mvmvif;
 146         int i, phy_id = -1, beacon_int = 0;
 147
 148         if (!mvm->noa_duration || !mvm->noa_vif)
 149                 return;
 150
 151         mvmvif = iwl_mvm_vif_from_mac80211(mvm->noa_vif);
 152         if (!mvmvif->ap_ibss_active)
 153                 return;
 154
 155         phy_id = mvmvif->phy_ctxt->id;
 156         beacon_int = mvm->noa_vif->bss_conf.beacon_int;
 157
 158         for (i = 0; i < MAX_BINDINGS; i++) {
 159                 u32 id_n_c = le32_to_cpu(cmd->quotas[i].id_and_color);
 160                 u32 id = (id_n_c & FW_CTXT_ID_MSK) >> FW_CTXT_ID_POS;
 161                 u32 quota = le32_to_cpu(cmd->quotas[i].quota);
 162
 163                 if (id != phy_id)
 164                         continue;
 165
 166                 quota *= (beacon_int - mvm->noa_duration);
 167                 quota /= beacon_int;
 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, struct ieee80211_vif *newvif)
 175 {
 176         struct iwl_time_quota_cmd cmd = {};
 177         int i, idx, ret, num_active_macs, quota, quota_rem, n_non_lowlat;
 178         struct iwl_mvm_quota_iterator_data data = {
 179                 .n_interfaces = {},
 180                 .colors = { -1, -1, -1, -1 },
 181                 .new_vif = newvif,
 182         };
 183
 184         lockdep_assert_held(&mvm->mutex);
 185
 186         /* update all upon completion */
 187         if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
 188                 return 0;
 189
 190         /* iterator data above must match */
 191         BUILD_BUG_ON(MAX_BINDINGS != 4);
 192
 193         ieee80211_iterate_active_interfaces_atomic(
 194                 mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 195                 iwl_mvm_quota_iterator, &data);
 196         if (newvif) {
 197                 data.new_vif = NULL;
 198                 iwl_mvm_quota_iterator(&data, newvif->addr, newvif);
 199         }
 200
 201         /*
 202          * The FW's scheduling session consists of
 203          * IWL_MVM_MAX_QUOTA fragments. Divide these fragments
 204          * equally between all the bindings that require quota
 205          */
 206         num_active_macs = 0;
 207         for (i = 0; i < MAX_BINDINGS; i++) {
 208                 cmd.quotas[i].id_and_color = cpu_to_le32(FW_CTXT_INVALID);
 209                 num_active_macs += data.n_interfaces[i];
 210         }
 211
 212         n_non_lowlat = num_active_macs;
 213
 214         if (data.n_low_latency_bindings == 1) {
 215                 for (i = 0; i < MAX_BINDINGS; i++) {
 216                         if (data.low_latency[i]) {
 217                                 n_non_lowlat -= data.n_interfaces[i];
 218                                 break;
 219                         }
 220                 }
 221                 if (n_non_lowlat) {
 222                         quota = (QUOTA_100 - QUOTA_LOWLAT_MIN) / n_non_lowlat;
 223                         quota_rem = QUOTA_100 - n_non_lowlat * quota -
 224                                     QUOTA_LOWLAT_MIN;
 225                 } else {
 226                         quota = QUOTA_100;
 227                         quota_rem = 0;
 228                 }
 229         } else if (num_active_macs) {
 230                 quota = QUOTA_100 / num_active_macs;
 231                 quota_rem = QUOTA_100 % num_active_macs;
 232         } else {
 233                 /* values don't really matter - won't be used */
 234                 quota = 0;
 235                 quota_rem = 0;
 236         }
 237
 238         for (idx = 0, i = 0; i < MAX_BINDINGS; i++) {
 239                 if (data.colors[i] < 0)
 240                         continue;
 241
 242                 cmd.quotas[idx].id_and_color =
 243                         cpu_to_le32(FW_CMD_ID_AND_COLOR(i, data.colors[i]));
 244
 245                 if (data.n_interfaces[i] <= 0) {
 246                         cmd.quotas[idx].quota = cpu_to_le32(0);
 247                         cmd.quotas[idx].max_duration = cpu_to_le32(0);
 248                 } else if (data.n_low_latency_bindings == 1 && n_non_lowlat &&
 249                            data.low_latency[i]) {
 250                         cmd.quotas[idx].quota = cpu_to_le32(QUOTA_LOWLAT_MIN);
 251                         cmd.quotas[idx].max_duration = cpu_to_le32(0);
 252                 } else {
 253                         cmd.quotas[idx].quota =
 254                                 cpu_to_le32(quota * data.n_interfaces[i]);
 255                         cmd.quotas[idx].max_duration = cpu_to_le32(0);
 256                 }
 257                 idx++;
 258         }
 259
 260         /* Give the remainder of the session to the first binding */
 261         le32_add_cpu(&cmd.quotas[0].quota, quota_rem);
 262
 263         iwl_mvm_adjust_quota_for_noa(mvm, &cmd);
 264
 265         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, CMD_SYNC,
 266                                    sizeof(cmd), &cmd);
 267         if (ret)
 268                 IWL_ERR(mvm, "Failed to send quota: %d\n", ret);
 269         return ret;
 270 }