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.
  32  *
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  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         bool vht_ena = vht_cap && vht_cap->vht_supported;
 121         u16 flags = 0;
 122
 123         if (mvm->cfg->ht_params->stbc &&
 124             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
 125             ((ht_cap && (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) ||
 126              (vht_ena && (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))))
 127                 flags |= IWL_TLC_MNG_CFG_FLAGS_STBC_MSK;
 128
 129         if (mvm->cfg->ht_params->ldpc &&
 130             ((ht_cap && (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) ||
 131              (vht_ena && (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))))
 132                 flags |= IWL_TLC_MNG_CFG_FLAGS_LDPC_MSK;
 133
 134         return flags;
 135 }
 136
 137 static
 138 int rs_fw_vht_highest_rx_mcs_index(const struct ieee80211_sta_vht_cap *vht_cap,
 139                                    int nss)
 140 {
 141         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
 142                 (0x3 << (2 * (nss - 1)));
 143         rx_mcs >>= (2 * (nss - 1));
 144
 145         switch (rx_mcs) {
 146         case IEEE80211_VHT_MCS_SUPPORT_0_7:
 147                 return IWL_TLC_MNG_HT_RATE_MCS7;
 148         case IEEE80211_VHT_MCS_SUPPORT_0_8:
 149                 return IWL_TLC_MNG_HT_RATE_MCS8;
 150         case IEEE80211_VHT_MCS_SUPPORT_0_9:
 151                 return IWL_TLC_MNG_HT_RATE_MCS9;
 152         default:
 153                 WARN_ON_ONCE(1);
 154                 break;
 155         }
 156
 157         return 0;
 158 }
 159
 160 static void
 161 rs_fw_vht_set_enabled_rates(const struct ieee80211_sta *sta,
 162                             const struct ieee80211_sta_vht_cap *vht_cap,
 163                             struct iwl_tlc_config_cmd *cmd)
 164 {
 165         u16 supp;
 166         int i, highest_mcs;
 167
 168         for (i = 0; i < sta->rx_nss; i++) {
 169                 if (i == MAX_NSS)
 170                         break;
 171
 172                 highest_mcs = rs_fw_vht_highest_rx_mcs_index(vht_cap, i + 1);
 173                 if (!highest_mcs)
 174                         continue;
 175
 176                 supp = BIT(highest_mcs + 1) - 1;
 177                 if (sta->bandwidth == IEEE80211_STA_RX_BW_20)
 178                         supp &= ~BIT(IWL_TLC_MNG_HT_RATE_MCS9);
 179
 180                 cmd->ht_rates[i][0] = cpu_to_le16(supp);
 181                 if (sta->bandwidth == IEEE80211_STA_RX_BW_160)
 182                         cmd->ht_rates[i][1] = cmd->ht_rates[i][0];
 183         }
 184 }
 185
 186 static u16 rs_fw_he_ieee80211_mcs_to_rs_mcs(u16 mcs)
 187 {
 188         switch (mcs) {
 189         case IEEE80211_HE_MCS_SUPPORT_0_7:
 190                 return BIT(IWL_TLC_MNG_HT_RATE_MCS7 + 1) - 1;
 191         case IEEE80211_HE_MCS_SUPPORT_0_9:
 192                 return BIT(IWL_TLC_MNG_HT_RATE_MCS9 + 1) - 1;
 193         case IEEE80211_HE_MCS_SUPPORT_0_11:
 194                 return BIT(IWL_TLC_MNG_HT_RATE_MCS11 + 1) - 1;
 195         case IEEE80211_HE_MCS_NOT_SUPPORTED:
 196                 return 0;
 197         }
 198
 199         WARN(1, "invalid HE MCS %d\n", mcs);
 200         return 0;
 201 }
 202
 203 static void
 204 rs_fw_he_set_enabled_rates(const struct ieee80211_sta *sta,
 205                            const struct ieee80211_sta_he_cap *he_cap,
 206                            struct iwl_tlc_config_cmd *cmd)
 207 {
 208         u16 mcs_160 = le16_to_cpu(sta->he_cap.he_mcs_nss_supp.rx_mcs_160);
 209         u16 mcs_80 = le16_to_cpu(sta->he_cap.he_mcs_nss_supp.rx_mcs_80);
 210         int i;
 211
 212         for (i = 0; i < sta->rx_nss && i < MAX_NSS; i++) {
 213                 u16 _mcs_160 = (mcs_160 >> (2 * i)) & 0x3;
 214                 u16 _mcs_80 = (mcs_80 >> (2 * i)) & 0x3;
 215
 216                 cmd->ht_rates[i][0] =
 217                         cpu_to_le16(rs_fw_he_ieee80211_mcs_to_rs_mcs(_mcs_80));
 218                 cmd->ht_rates[i][1] =
 219                         cpu_to_le16(rs_fw_he_ieee80211_mcs_to_rs_mcs(_mcs_160));
 220         }
 221 }
 222
 223 static void rs_fw_set_supp_rates(struct ieee80211_sta *sta,
 224                                  struct ieee80211_supported_band *sband,
 225                                  struct iwl_tlc_config_cmd *cmd)
 226 {
 227         int i;
 228         unsigned long tmp;
 229         unsigned long supp; /* must be unsigned long for for_each_set_bit */
 230         const struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 231         const struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 232         const struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;
 233
 234         /* non HT rates */
 235         supp = 0;
 236         tmp = sta->supp_rates[sband->band];
 237         for_each_set_bit(i, &tmp, BITS_PER_LONG)
 238                 supp |= BIT(sband->bitrates[i].hw_value);
 239
 240         cmd->non_ht_rates = cpu_to_le16(supp);
 241         cmd->mode = IWL_TLC_MNG_MODE_NON_HT;
 242
 243         /* HT/VHT rates */
 244         if (he_cap && he_cap->has_he) {
 245                 cmd->mode = IWL_TLC_MNG_MODE_HE;
 246                 rs_fw_he_set_enabled_rates(sta, he_cap, cmd);
 247         } else if (vht_cap && vht_cap->vht_supported) {
 248                 cmd->mode = IWL_TLC_MNG_MODE_VHT;
 249                 rs_fw_vht_set_enabled_rates(sta, vht_cap, cmd);
 250         } else if (ht_cap && ht_cap->ht_supported) {
 251                 cmd->mode = IWL_TLC_MNG_MODE_HT;
 252                 cmd->ht_rates[0][0] = cpu_to_le16(ht_cap->mcs.rx_mask[0]);
 253                 cmd->ht_rates[1][0] = cpu_to_le16(ht_cap->mcs.rx_mask[1]);
 254         }
 255 }
 256
 257 void iwl_mvm_tlc_update_notif(struct iwl_mvm *mvm,
 258                               struct iwl_rx_cmd_buffer *rxb)
 259 {
 260         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 261         struct iwl_tlc_update_notif *notif;
 262         struct ieee80211_sta *sta;
 263         struct iwl_mvm_sta *mvmsta;
 264         struct iwl_lq_sta_rs_fw *lq_sta;
 265         u32 flags;
 266
 267         rcu_read_lock();
 268
 269         notif = (void *)pkt->data;
 270         sta = rcu_dereference(mvm->fw_id_to_mac_id[notif->sta_id]);
 271         if (IS_ERR_OR_NULL(sta)) {
 272                 IWL_ERR(mvm, "Invalid sta id (%d) in FW TLC notification\n",
 273                         notif->sta_id);
 274                 goto out;
 275         }
 276
 277         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 278
 279         if (!mvmsta) {
 280                 IWL_ERR(mvm, "Invalid sta id (%d) in FW TLC notification\n",
 281                         notif->sta_id);
 282                 goto out;
 283         }
 284
 285         flags = le32_to_cpu(notif->flags);
 286
 287         lq_sta = &mvmsta->lq_sta.rs_fw;
 288
 289         if (flags & IWL_TLC_NOTIF_FLAG_RATE) {
 290                 lq_sta->last_rate_n_flags = le32_to_cpu(notif->rate);
 291                 IWL_DEBUG_RATE(mvm, "new rate_n_flags: 0x%X\n",
 292                                lq_sta->last_rate_n_flags);
 293         }
 294
 295         if (flags & IWL_TLC_NOTIF_FLAG_AMSDU) {
 296                 u16 size = le32_to_cpu(notif->amsdu_size);
 297
 298                 if (WARN_ON(sta->max_amsdu_len < size))
 299                         goto out;
 300
 301                 mvmsta->amsdu_enabled = le32_to_cpu(notif->amsdu_enabled);
 302                 mvmsta->max_amsdu_len = size;
 303
 304                 IWL_DEBUG_RATE(mvm,
 305                                "AMSDU update. AMSDU size: %d, AMSDU selected size: %d, AMSDU TID bitmap 0x%X\n",
 306                                le32_to_cpu(notif->amsdu_size), size,
 307                                mvmsta->amsdu_enabled);
 308         }
 309 out:
 310         rcu_read_unlock();
 311 }
 312
 313 void rs_fw_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 314                      enum nl80211_band band)
 315 {
 316         struct ieee80211_hw *hw = mvm->hw;
 317         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 318         struct iwl_lq_sta_rs_fw *lq_sta = &mvmsta->lq_sta.rs_fw;
 319         u32 cmd_id = iwl_cmd_id(TLC_MNG_CONFIG_CMD, DATA_PATH_GROUP, 0);
 320         struct ieee80211_supported_band *sband;
 321         struct iwl_tlc_config_cmd cfg_cmd = {
 322                 .sta_id = mvmsta->sta_id,
 323                 .max_ch_width = rs_fw_bw_from_sta_bw(sta),
 324                 .flags = cpu_to_le16(rs_fw_set_config_flags(mvm, sta)),
 325                 .chains = rs_fw_set_active_chains(iwl_mvm_get_valid_tx_ant(mvm)),
 326                 .max_mpdu_len = cpu_to_le16(sta->max_amsdu_len),
 327                 .sgi_ch_width_supp = rs_fw_sgi_cw_support(sta),
 328                 .amsdu = iwl_mvm_is_csum_supported(mvm),
 329         };
 330         int ret;
 331
 332         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
 333
 334 #ifdef CONFIG_IWLWIFI_DEBUGFS
 335         iwl_mvm_reset_frame_stats(mvm);
 336 #endif
 337         sband = hw->wiphy->bands[band];
 338         rs_fw_set_supp_rates(sta, sband, &cfg_cmd);
 339
 340         ret = iwl_mvm_send_cmd_pdu(mvm, cmd_id, 0, sizeof(cfg_cmd), &cfg_cmd);
 341         if (ret)
 342                 IWL_ERR(mvm, "Failed to send rate scale config (%d)\n", ret);
 343 }
 344
 345 int rs_fw_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
 346                         bool enable)
 347 {
 348         /* TODO: need to introduce a new FW cmd since LQ cmd is not relevant */
 349         IWL_DEBUG_RATE(mvm, "tx protection - not implemented yet.\n");
 350         return 0;
 351 }
 352
 353 void iwl_mvm_rs_add_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta)
 354 {
 355         struct iwl_lq_sta_rs_fw *lq_sta = &mvmsta->lq_sta.rs_fw;
 356
 357         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
 358
 359         lq_sta->pers.drv = mvm;
 360         lq_sta->pers.sta_id = mvmsta->sta_id;
 361         lq_sta->pers.chains = 0;
 362         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
 363         lq_sta->pers.last_rssi = S8_MIN;
 364         lq_sta->last_rate_n_flags = 0;
 365
 366 #ifdef CONFIG_MAC80211_DEBUGFS
 367         lq_sta->pers.dbg_fixed_rate = 0;
 368 #endif
 369 }