drivers/net/wireless/intel/iwlwifi/mvm/rs-fw.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) 2017        Intel Deutschland GmbH
   9  * Copyright(c) 2018 Intel Corporation
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of version 2 of the GNU General Public License as
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * The full GNU General Public License is included in this distribution
  21  * in the file called COPYING.
  22  *
  23  * Contact Information:
  24  *  Intel Linux Wireless <linuxwifi@intel.com>
  25  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26  *
  27  * BSD LICENSE
  28  *
  29  * Copyright(c) 2017        Intel Deutschland GmbH
  30  * Copyright(c) 2018 Intel Corporation
  31  * All rights reserved.
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  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
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  38  *    notice, this list of conditions and the following disclaimer.
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  40  *    notice, this list of conditions and the following disclaimer in
  41  *    the documentation and/or other materials provided with the
  42  *    distribution.
  43  *  * Neither the name Intel Corporation nor the names of its
  44  *    contributors may be used to endorse or promote products derived
  45  *    from this software without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  48  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  49  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  50  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  51  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  52  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  53  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  54  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  55  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  56  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  57  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  58  *
  59  *****************************************************************************/
  60 #include "rs.h"
  61 #include "fw-api.h"
  62 #include "sta.h"
  63 #include "iwl-op-mode.h"
  64 #include "mvm.h"
  65
  66 static u8 rs_fw_bw_from_sta_bw(struct ieee80211_sta *sta)
  67 {
  68         switch (sta->bandwidth) {
  69         case IEEE80211_STA_RX_BW_160:
  70                 return IWL_TLC_MNG_CH_WIDTH_160MHZ;
  71         case IEEE80211_STA_RX_BW_80:
  72                 return IWL_TLC_MNG_CH_WIDTH_80MHZ;
  73         case IEEE80211_STA_RX_BW_40:
  74                 return IWL_TLC_MNG_CH_WIDTH_40MHZ;
  75         case IEEE80211_STA_RX_BW_20:
  76         default:
  77                 return IWL_TLC_MNG_CH_WIDTH_20MHZ;
  78         }
  79 }
  80
  81 static u8 rs_fw_set_active_chains(u8 chains)
  82 {
  83         u8 fw_chains = 0;
  84
  85         if (chains & ANT_A)
  86                 fw_chains |= IWL_TLC_MNG_CHAIN_A_MSK;
  87         if (chains & ANT_B)
  88                 fw_chains |= IWL_TLC_MNG_CHAIN_B_MSK;
  89         if (chains & ANT_C)
  90                 WARN(false,
  91                      "tlc offload doesn't support antenna C. chains: 0x%x\n",
  92                      chains);
  93
  94         return fw_chains;
  95 }
  96
  97 static u8 rs_fw_sgi_cw_support(struct ieee80211_sta *sta)
  98 {
  99         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 100         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 101         u8 supp = 0;
 102
 103         if (ht_cap->cap & IEEE80211_HT_CAP_SGI_20)
 104                 supp |= BIT(IWL_TLC_MNG_CH_WIDTH_20MHZ);
 105         if (ht_cap->cap & IEEE80211_HT_CAP_SGI_40)
 106                 supp |= BIT(IWL_TLC_MNG_CH_WIDTH_40MHZ);
 107         if (vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_80)
 108                 supp |= BIT(IWL_TLC_MNG_CH_WIDTH_80MHZ);
 109         if (vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_160)
 110                 supp |= BIT(IWL_TLC_MNG_CH_WIDTH_160MHZ);
 111
 112         return supp;
 113 }
 114
 115 static u16 rs_fw_set_config_flags(struct iwl_mvm *mvm,
 116                                   struct ieee80211_sta *sta)
 117 {
 118         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 119         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 120         struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;
 121         bool vht_ena = vht_cap && vht_cap->vht_supported;
 122         u16 flags = 0;
 123
 124         if (mvm->cfg->ht_params->stbc &&
 125             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1)) {
 126                 if (he_cap && he_cap->has_he) {
 127                         if (he_cap->he_cap_elem.phy_cap_info[2] &
 128                             IEEE80211_HE_PHY_CAP2_STBC_RX_UNDER_80MHZ)
 129                                 flags |= IWL_TLC_MNG_CFG_FLAGS_STBC_MSK;
 130
 131                         if (he_cap->he_cap_elem.phy_cap_info[7] &
 132                             IEEE80211_HE_PHY_CAP7_STBC_RX_ABOVE_80MHZ)
 133                                 flags |= IWL_TLC_MNG_CFG_FLAGS_HE_STBC_160MHZ_MSK;
 134                 } else if ((ht_cap &&
 135                             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) ||
 136                            (vht_ena &&
 137                             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)))
 138                         flags |= IWL_TLC_MNG_CFG_FLAGS_STBC_MSK;
 139         }
 140
 141         if (mvm->cfg->ht_params->ldpc &&
 142             ((ht_cap && (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) ||
 143              (vht_ena && (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))))
 144                 flags |= IWL_TLC_MNG_CFG_FLAGS_LDPC_MSK;
 145
 146         if (he_cap && he_cap->has_he &&
 147             (he_cap->he_cap_elem.phy_cap_info[3] &
 148              IEEE80211_HE_PHY_CAP3_DCM_MAX_CONST_TX_MASK)) {
 149                 flags |= IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_1_MSK;
 150
 151                 if (he_cap->he_cap_elem.phy_cap_info[3] &
 152                     IEEE80211_HE_PHY_CAP3_DCM_MAX_TX_NSS_2)
 153                         flags |= IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_2_MSK;
 154         }
 155
 156         return flags;
 157 }
 158
 159 static
 160 int rs_fw_vht_highest_rx_mcs_index(const struct ieee80211_sta_vht_cap *vht_cap,
 161                                    int nss)
 162 {
 163         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
 164                 (0x3 << (2 * (nss - 1)));
 165         rx_mcs >>= (2 * (nss - 1));
 166
 167         switch (rx_mcs) {
 168         case IEEE80211_VHT_MCS_SUPPORT_0_7:
 169                 return IWL_TLC_MNG_HT_RATE_MCS7;
 170         case IEEE80211_VHT_MCS_SUPPORT_0_8:
 171                 return IWL_TLC_MNG_HT_RATE_MCS8;
 172         case IEEE80211_VHT_MCS_SUPPORT_0_9:
 173                 return IWL_TLC_MNG_HT_RATE_MCS9;
 174         default:
 175                 WARN_ON_ONCE(1);
 176                 break;
 177         }
 178
 179         return 0;
 180 }
 181
 182 static void
 183 rs_fw_vht_set_enabled_rates(const struct ieee80211_sta *sta,
 184                             const struct ieee80211_sta_vht_cap *vht_cap,
 185                             struct iwl_tlc_config_cmd *cmd)
 186 {
 187         u16 supp;
 188         int i, highest_mcs;
 189
 190         for (i = 0; i < sta->rx_nss; i++) {
 191                 if (i == MAX_NSS)
 192                         break;
 193
 194                 highest_mcs = rs_fw_vht_highest_rx_mcs_index(vht_cap, i + 1);
 195                 if (!highest_mcs)
 196                         continue;
 197
 198                 supp = BIT(highest_mcs + 1) - 1;
 199                 if (sta->bandwidth == IEEE80211_STA_RX_BW_20)
 200                         supp &= ~BIT(IWL_TLC_MNG_HT_RATE_MCS9);
 201
 202                 cmd->ht_rates[i][0] = cpu_to_le16(supp);
 203                 if (sta->bandwidth == IEEE80211_STA_RX_BW_160)
 204                         cmd->ht_rates[i][1] = cmd->ht_rates[i][0];
 205         }
 206 }
 207
 208 static u16 rs_fw_he_ieee80211_mcs_to_rs_mcs(u16 mcs)
 209 {
 210         switch (mcs) {
 211         case IEEE80211_HE_MCS_SUPPORT_0_7:
 212                 return BIT(IWL_TLC_MNG_HT_RATE_MCS7 + 1) - 1;
 213         case IEEE80211_HE_MCS_SUPPORT_0_9:
 214                 return BIT(IWL_TLC_MNG_HT_RATE_MCS9 + 1) - 1;
 215         case IEEE80211_HE_MCS_SUPPORT_0_11:
 216                 return BIT(IWL_TLC_MNG_HT_RATE_MCS11 + 1) - 1;
 217         case IEEE80211_HE_MCS_NOT_SUPPORTED:
 218                 return 0;
 219         }
 220
 221         WARN(1, "invalid HE MCS %d\n", mcs);
 222         return 0;
 223 }
 224
 225 static void
 226 rs_fw_he_set_enabled_rates(const struct ieee80211_sta *sta,
 227                            const struct ieee80211_sta_he_cap *he_cap,
 228                            struct iwl_tlc_config_cmd *cmd)
 229 {
 230         u16 mcs_160 = le16_to_cpu(sta->he_cap.he_mcs_nss_supp.rx_mcs_160);
 231         u16 mcs_80 = le16_to_cpu(sta->he_cap.he_mcs_nss_supp.rx_mcs_80);
 232         int i;
 233
 234         for (i = 0; i < sta->rx_nss && i < MAX_NSS; i++) {
 235                 u16 _mcs_160 = (mcs_160 >> (2 * i)) & 0x3;
 236                 u16 _mcs_80 = (mcs_80 >> (2 * i)) & 0x3;
 237
 238                 cmd->ht_rates[i][0] =
 239                         cpu_to_le16(rs_fw_he_ieee80211_mcs_to_rs_mcs(_mcs_80));
 240                 cmd->ht_rates[i][1] =
 241                         cpu_to_le16(rs_fw_he_ieee80211_mcs_to_rs_mcs(_mcs_160));
 242         }
 243 }
 244
 245 static void rs_fw_set_supp_rates(struct ieee80211_sta *sta,
 246                                  struct ieee80211_supported_band *sband,
 247                                  struct iwl_tlc_config_cmd *cmd)
 248 {
 249         int i;
 250         unsigned long tmp;
 251         unsigned long supp; /* must be unsigned long for for_each_set_bit */
 252         const struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 253         const struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 254         const struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;
 255
 256         /* non HT rates */
 257         supp = 0;
 258         tmp = sta->supp_rates[sband->band];
 259         for_each_set_bit(i, &tmp, BITS_PER_LONG)
 260                 supp |= BIT(sband->bitrates[i].hw_value);
 261
 262         cmd->non_ht_rates = cpu_to_le16(supp);
 263         cmd->mode = IWL_TLC_MNG_MODE_NON_HT;
 264
 265         /* HT/VHT rates */
 266         if (he_cap && he_cap->has_he) {
 267                 cmd->mode = IWL_TLC_MNG_MODE_HE;
 268                 rs_fw_he_set_enabled_rates(sta, he_cap, cmd);
 269         } else if (vht_cap && vht_cap->vht_supported) {
 270                 cmd->mode = IWL_TLC_MNG_MODE_VHT;
 271                 rs_fw_vht_set_enabled_rates(sta, vht_cap, cmd);
 272         } else if (ht_cap && ht_cap->ht_supported) {
 273                 cmd->mode = IWL_TLC_MNG_MODE_HT;
 274                 cmd->ht_rates[0][0] = cpu_to_le16(ht_cap->mcs.rx_mask[0]);
 275                 cmd->ht_rates[1][0] = cpu_to_le16(ht_cap->mcs.rx_mask[1]);
 276         }
 277 }
 278
 279 void iwl_mvm_tlc_update_notif(struct iwl_mvm *mvm,
 280                               struct iwl_rx_cmd_buffer *rxb)
 281 {
 282         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 283         struct iwl_tlc_update_notif *notif;
 284         struct ieee80211_sta *sta;
 285         struct iwl_mvm_sta *mvmsta;
 286         struct iwl_lq_sta_rs_fw *lq_sta;
 287         u32 flags;
 288
 289         rcu_read_lock();
 290
 291         notif = (void *)pkt->data;
 292         sta = rcu_dereference(mvm->fw_id_to_mac_id[notif->sta_id]);
 293         if (IS_ERR_OR_NULL(sta)) {
 294                 IWL_ERR(mvm, "Invalid sta id (%d) in FW TLC notification\n",
 295                         notif->sta_id);
 296                 goto out;
 297         }
 298
 299         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 300
 301         if (!mvmsta) {
 302                 IWL_ERR(mvm, "Invalid sta id (%d) in FW TLC notification\n",
 303                         notif->sta_id);
 304                 goto out;
 305         }
 306
 307         flags = le32_to_cpu(notif->flags);
 308
 309         lq_sta = &mvmsta->lq_sta.rs_fw;
 310
 311         if (flags & IWL_TLC_NOTIF_FLAG_RATE) {
 312                 lq_sta->last_rate_n_flags = le32_to_cpu(notif->rate);
 313                 IWL_DEBUG_RATE(mvm, "new rate_n_flags: 0x%X\n",
 314                                lq_sta->last_rate_n_flags);
 315         }
 316
 317         if (flags & IWL_TLC_NOTIF_FLAG_AMSDU) {
 318                 u16 size = le32_to_cpu(notif->amsdu_size);
 319
 320                 if (WARN_ON(sta->max_amsdu_len < size))
 321                         goto out;
 322
 323                 mvmsta->amsdu_enabled = le32_to_cpu(notif->amsdu_enabled);
 324                 mvmsta->max_amsdu_len = size;
 325
 326                 IWL_DEBUG_RATE(mvm,
 327                                "AMSDU update. AMSDU size: %d, AMSDU selected size: %d, AMSDU TID bitmap 0x%X\n",
 328                                le32_to_cpu(notif->amsdu_size), size,
 329                                mvmsta->amsdu_enabled);
 330         }
 331 out:
 332         rcu_read_unlock();
 333 }
 334
 335 void rs_fw_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 336                      enum nl80211_band band, bool update)
 337 {
 338         struct ieee80211_hw *hw = mvm->hw;
 339         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 340         struct iwl_lq_sta_rs_fw *lq_sta = &mvmsta->lq_sta.rs_fw;
 341         u32 cmd_id = iwl_cmd_id(TLC_MNG_CONFIG_CMD, DATA_PATH_GROUP, 0);
 342         struct ieee80211_supported_band *sband;
 343         struct iwl_tlc_config_cmd cfg_cmd = {
 344                 .sta_id = mvmsta->sta_id,
 345                 .max_ch_width = update ?
 346                         rs_fw_bw_from_sta_bw(sta) : RATE_MCS_CHAN_WIDTH_20,
 347                 .flags = cpu_to_le16(rs_fw_set_config_flags(mvm, sta)),
 348                 .chains = rs_fw_set_active_chains(iwl_mvm_get_valid_tx_ant(mvm)),
 349                 .max_mpdu_len = cpu_to_le16(sta->max_amsdu_len),
 350                 .sgi_ch_width_supp = rs_fw_sgi_cw_support(sta),
 351                 .amsdu = iwl_mvm_is_csum_supported(mvm),
 352         };
 353         int ret;
 354
 355         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
 356
 357 #ifdef CONFIG_IWLWIFI_DEBUGFS
 358         iwl_mvm_reset_frame_stats(mvm);
 359 #endif
 360         sband = hw->wiphy->bands[band];
 361         rs_fw_set_supp_rates(sta, sband, &cfg_cmd);
 362
 363         ret = iwl_mvm_send_cmd_pdu(mvm, cmd_id, 0, sizeof(cfg_cmd), &cfg_cmd);
 364         if (ret)
 365                 IWL_ERR(mvm, "Failed to send rate scale config (%d)\n", ret);
 366 }
 367
 368 int rs_fw_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
 369                         bool enable)
 370 {
 371         /* TODO: need to introduce a new FW cmd since LQ cmd is not relevant */
 372         IWL_DEBUG_RATE(mvm, "tx protection - not implemented yet.\n");
 373         return 0;
 374 }
 375
 376 void iwl_mvm_rs_add_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta)
 377 {
 378         struct iwl_lq_sta_rs_fw *lq_sta = &mvmsta->lq_sta.rs_fw;
 379
 380         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
 381
 382         lq_sta->pers.drv = mvm;
 383         lq_sta->pers.sta_id = mvmsta->sta_id;
 384         lq_sta->pers.chains = 0;
 385         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
 386         lq_sta->pers.last_rssi = S8_MIN;
 387         lq_sta->last_rate_n_flags = 0;
 388
 389 #ifdef CONFIG_MAC80211_DEBUGFS
 390         lq_sta->pers.dbg_fixed_rate = 0;
 391 #endif
 392 }