Merge branch 'core-objtool-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-block.git] / 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 - 2020 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 - 2020 Intel Corporation
31  * All rights reserved.
32  *
33  * Redistribution and use in source and binary forms, with or without
34  * modification, are permitted provided that the following conditions
35  * are met:
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38  *    notice, this list of conditions and the following disclaimer.
39  *  * Redistributions in binary form must reproduce the above copyright
40  *    notice, this list of conditions and the following disclaimer in
41  *    the documentation and/or other materials provided with the
42  *    distribution.
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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         struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;
102         u8 supp = 0;
103
104         if (he_cap->has_he)
105                 return 0;
106
107         if (ht_cap->cap & IEEE80211_HT_CAP_SGI_20)
108                 supp |= BIT(IWL_TLC_MNG_CH_WIDTH_20MHZ);
109         if (ht_cap->cap & IEEE80211_HT_CAP_SGI_40)
110                 supp |= BIT(IWL_TLC_MNG_CH_WIDTH_40MHZ);
111         if (vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_80)
112                 supp |= BIT(IWL_TLC_MNG_CH_WIDTH_80MHZ);
113         if (vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_160)
114                 supp |= BIT(IWL_TLC_MNG_CH_WIDTH_160MHZ);
115
116         return supp;
117 }
118
119 static u16 rs_fw_get_config_flags(struct iwl_mvm *mvm,
120                                   struct ieee80211_sta *sta,
121                                   struct ieee80211_supported_band *sband)
122 {
123         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
124         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
125         struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;
126         bool vht_ena = vht_cap->vht_supported;
127         u16 flags = 0;
128
129         if (mvm->cfg->ht_params->stbc &&
130             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1)) {
131                 if (he_cap->has_he) {
132                         if (he_cap->he_cap_elem.phy_cap_info[2] &
133                             IEEE80211_HE_PHY_CAP2_STBC_RX_UNDER_80MHZ)
134                                 flags |= IWL_TLC_MNG_CFG_FLAGS_STBC_MSK;
135
136                         if (he_cap->he_cap_elem.phy_cap_info[7] &
137                             IEEE80211_HE_PHY_CAP7_STBC_RX_ABOVE_80MHZ)
138                                 flags |= IWL_TLC_MNG_CFG_FLAGS_HE_STBC_160MHZ_MSK;
139                 } else if ((ht_cap->cap & IEEE80211_HT_CAP_RX_STBC) ||
140                            (vht_ena &&
141                             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)))
142                         flags |= IWL_TLC_MNG_CFG_FLAGS_STBC_MSK;
143         }
144
145         if (mvm->cfg->ht_params->ldpc &&
146             ((ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING) ||
147              (vht_ena && (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))))
148                 flags |= IWL_TLC_MNG_CFG_FLAGS_LDPC_MSK;
149
150         /* consider LDPC support in case of HE */
151         if (he_cap->has_he && (he_cap->he_cap_elem.phy_cap_info[1] &
152             IEEE80211_HE_PHY_CAP1_LDPC_CODING_IN_PAYLOAD))
153                 flags |= IWL_TLC_MNG_CFG_FLAGS_LDPC_MSK;
154
155         if (sband->iftype_data && sband->iftype_data->he_cap.has_he &&
156             !(sband->iftype_data->he_cap.he_cap_elem.phy_cap_info[1] &
157              IEEE80211_HE_PHY_CAP1_LDPC_CODING_IN_PAYLOAD))
158                 flags &= ~IWL_TLC_MNG_CFG_FLAGS_LDPC_MSK;
159
160         if (he_cap->has_he &&
161             (he_cap->he_cap_elem.phy_cap_info[3] &
162              IEEE80211_HE_PHY_CAP3_DCM_MAX_CONST_RX_MASK))
163                 flags |= IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_1_MSK;
164
165         return flags;
166 }
167
168 static
169 int rs_fw_vht_highest_rx_mcs_index(const struct ieee80211_sta_vht_cap *vht_cap,
170                                    int nss)
171 {
172         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
173                 (0x3 << (2 * (nss - 1)));
174         rx_mcs >>= (2 * (nss - 1));
175
176         switch (rx_mcs) {
177         case IEEE80211_VHT_MCS_SUPPORT_0_7:
178                 return IWL_TLC_MNG_HT_RATE_MCS7;
179         case IEEE80211_VHT_MCS_SUPPORT_0_8:
180                 return IWL_TLC_MNG_HT_RATE_MCS8;
181         case IEEE80211_VHT_MCS_SUPPORT_0_9:
182                 return IWL_TLC_MNG_HT_RATE_MCS9;
183         default:
184                 WARN_ON_ONCE(1);
185                 break;
186         }
187
188         return 0;
189 }
190
191 static void
192 rs_fw_vht_set_enabled_rates(const struct ieee80211_sta *sta,
193                             const struct ieee80211_sta_vht_cap *vht_cap,
194                             struct iwl_tlc_config_cmd *cmd)
195 {
196         u16 supp;
197         int i, highest_mcs;
198         u8 nss = sta->rx_nss;
199
200         /* the station support only a single receive chain */
201         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
202                 nss = 1;
203
204         for (i = 0; i < nss && i < IWL_TLC_NSS_MAX; i++) {
205                 highest_mcs = rs_fw_vht_highest_rx_mcs_index(vht_cap, i + 1);
206                 if (!highest_mcs)
207                         continue;
208
209                 supp = BIT(highest_mcs + 1) - 1;
210                 if (sta->bandwidth == IEEE80211_STA_RX_BW_20)
211                         supp &= ~BIT(IWL_TLC_MNG_HT_RATE_MCS9);
212
213                 cmd->ht_rates[i][IWL_TLC_HT_BW_NONE_160] = cpu_to_le16(supp);
214                 if (sta->bandwidth == IEEE80211_STA_RX_BW_160)
215                         cmd->ht_rates[i][IWL_TLC_HT_BW_160] =
216                                 cmd->ht_rates[i][IWL_TLC_HT_BW_NONE_160];
217         }
218 }
219
220 static u16 rs_fw_he_ieee80211_mcs_to_rs_mcs(u16 mcs)
221 {
222         switch (mcs) {
223         case IEEE80211_HE_MCS_SUPPORT_0_7:
224                 return BIT(IWL_TLC_MNG_HT_RATE_MCS7 + 1) - 1;
225         case IEEE80211_HE_MCS_SUPPORT_0_9:
226                 return BIT(IWL_TLC_MNG_HT_RATE_MCS9 + 1) - 1;
227         case IEEE80211_HE_MCS_SUPPORT_0_11:
228                 return BIT(IWL_TLC_MNG_HT_RATE_MCS11 + 1) - 1;
229         case IEEE80211_HE_MCS_NOT_SUPPORTED:
230                 return 0;
231         }
232
233         WARN(1, "invalid HE MCS %d\n", mcs);
234         return 0;
235 }
236
237 static void
238 rs_fw_he_set_enabled_rates(const struct ieee80211_sta *sta,
239                            struct ieee80211_supported_band *sband,
240                            struct iwl_tlc_config_cmd *cmd)
241 {
242         const struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;
243         u16 mcs_160 = le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_160);
244         u16 mcs_80 = le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_80);
245         u16 tx_mcs_80 =
246                 le16_to_cpu(sband->iftype_data->he_cap.he_mcs_nss_supp.tx_mcs_80);
247         u16 tx_mcs_160 =
248                 le16_to_cpu(sband->iftype_data->he_cap.he_mcs_nss_supp.tx_mcs_160);
249         int i;
250         u8 nss = sta->rx_nss;
251
252         /* the station support only a single receive chain */
253         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
254                 nss = 1;
255
256         for (i = 0; i < nss && i < IWL_TLC_NSS_MAX; i++) {
257                 u16 _mcs_160 = (mcs_160 >> (2 * i)) & 0x3;
258                 u16 _mcs_80 = (mcs_80 >> (2 * i)) & 0x3;
259                 u16 _tx_mcs_160 = (tx_mcs_160 >> (2 * i)) & 0x3;
260                 u16 _tx_mcs_80 = (tx_mcs_80 >> (2 * i)) & 0x3;
261
262                 /* If one side doesn't support - mark both as not supporting */
263                 if (_mcs_80 == IEEE80211_HE_MCS_NOT_SUPPORTED ||
264                     _tx_mcs_80 == IEEE80211_HE_MCS_NOT_SUPPORTED) {
265                         _mcs_80 = IEEE80211_HE_MCS_NOT_SUPPORTED;
266                         _tx_mcs_80 = IEEE80211_HE_MCS_NOT_SUPPORTED;
267                 }
268                 if (_mcs_80 > _tx_mcs_80)
269                         _mcs_80 = _tx_mcs_80;
270                 cmd->ht_rates[i][IWL_TLC_HT_BW_NONE_160] =
271                         cpu_to_le16(rs_fw_he_ieee80211_mcs_to_rs_mcs(_mcs_80));
272
273                 /* If one side doesn't support - mark both as not supporting */
274                 if (_mcs_160 == IEEE80211_HE_MCS_NOT_SUPPORTED ||
275                     _tx_mcs_160 == IEEE80211_HE_MCS_NOT_SUPPORTED) {
276                         _mcs_160 = IEEE80211_HE_MCS_NOT_SUPPORTED;
277                         _tx_mcs_160 = IEEE80211_HE_MCS_NOT_SUPPORTED;
278                 }
279                 if (_mcs_160 > _tx_mcs_160)
280                         _mcs_160 = _tx_mcs_160;
281                 cmd->ht_rates[i][IWL_TLC_HT_BW_160] =
282                         cpu_to_le16(rs_fw_he_ieee80211_mcs_to_rs_mcs(_mcs_160));
283         }
284 }
285
286 static void rs_fw_set_supp_rates(struct ieee80211_sta *sta,
287                                  struct ieee80211_supported_band *sband,
288                                  struct iwl_tlc_config_cmd *cmd)
289 {
290         int i;
291         unsigned long tmp;
292         unsigned long supp; /* must be unsigned long for for_each_set_bit */
293         const struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
294         const struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
295         const struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;
296
297         /* non HT rates */
298         supp = 0;
299         tmp = sta->supp_rates[sband->band];
300         for_each_set_bit(i, &tmp, BITS_PER_LONG)
301                 supp |= BIT(sband->bitrates[i].hw_value);
302
303         cmd->non_ht_rates = cpu_to_le16(supp);
304         cmd->mode = IWL_TLC_MNG_MODE_NON_HT;
305
306         /* HT/VHT rates */
307         if (he_cap->has_he) {
308                 cmd->mode = IWL_TLC_MNG_MODE_HE;
309                 rs_fw_he_set_enabled_rates(sta, sband, cmd);
310         } else if (vht_cap->vht_supported) {
311                 cmd->mode = IWL_TLC_MNG_MODE_VHT;
312                 rs_fw_vht_set_enabled_rates(sta, vht_cap, cmd);
313         } else if (ht_cap->ht_supported) {
314                 cmd->mode = IWL_TLC_MNG_MODE_HT;
315                 cmd->ht_rates[IWL_TLC_NSS_1][IWL_TLC_HT_BW_NONE_160] =
316                         cpu_to_le16(ht_cap->mcs.rx_mask[0]);
317
318                 /* the station support only a single receive chain */
319                 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
320                         cmd->ht_rates[IWL_TLC_NSS_2][IWL_TLC_HT_BW_NONE_160] =
321                                 0;
322                 else
323                         cmd->ht_rates[IWL_TLC_NSS_2][IWL_TLC_HT_BW_NONE_160] =
324                                 cpu_to_le16(ht_cap->mcs.rx_mask[1]);
325         }
326 }
327
328 void iwl_mvm_tlc_update_notif(struct iwl_mvm *mvm,
329                               struct iwl_rx_cmd_buffer *rxb)
330 {
331         struct iwl_rx_packet *pkt = rxb_addr(rxb);
332         struct iwl_tlc_update_notif *notif;
333         struct ieee80211_sta *sta;
334         struct iwl_mvm_sta *mvmsta;
335         struct iwl_lq_sta_rs_fw *lq_sta;
336         u32 flags;
337
338         rcu_read_lock();
339
340         notif = (void *)pkt->data;
341         sta = rcu_dereference(mvm->fw_id_to_mac_id[notif->sta_id]);
342         if (IS_ERR_OR_NULL(sta)) {
343                 IWL_ERR(mvm, "Invalid sta id (%d) in FW TLC notification\n",
344                         notif->sta_id);
345                 goto out;
346         }
347
348         mvmsta = iwl_mvm_sta_from_mac80211(sta);
349
350         if (!mvmsta) {
351                 IWL_ERR(mvm, "Invalid sta id (%d) in FW TLC notification\n",
352                         notif->sta_id);
353                 goto out;
354         }
355
356         flags = le32_to_cpu(notif->flags);
357
358         lq_sta = &mvmsta->lq_sta.rs_fw;
359
360         if (flags & IWL_TLC_NOTIF_FLAG_RATE) {
361                 char pretty_rate[100];
362                 lq_sta->last_rate_n_flags = le32_to_cpu(notif->rate);
363                 rs_pretty_print_rate(pretty_rate, sizeof(pretty_rate),
364                                      lq_sta->last_rate_n_flags);
365                 IWL_DEBUG_RATE(mvm, "new rate: %s\n", pretty_rate);
366         }
367
368         if (flags & IWL_TLC_NOTIF_FLAG_AMSDU && !mvmsta->orig_amsdu_len) {
369                 u16 size = le32_to_cpu(notif->amsdu_size);
370                 int i;
371
372                 /*
373                  * In debug sta->max_amsdu_len < size
374                  * so also check with orig_amsdu_len which holds the original
375                  * data before debugfs changed the value
376                  */
377                 if (WARN_ON(sta->max_amsdu_len < size &&
378                             mvmsta->orig_amsdu_len < size))
379                         goto out;
380
381                 mvmsta->amsdu_enabled = le32_to_cpu(notif->amsdu_enabled);
382                 mvmsta->max_amsdu_len = size;
383                 sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;
384
385                 for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
386                         if (mvmsta->amsdu_enabled & BIT(i))
387                                 sta->max_tid_amsdu_len[i] =
388                                         iwl_mvm_max_amsdu_size(mvm, sta, i);
389                         else
390                                 /*
391                                  * Not so elegant, but this will effectively
392                                  * prevent AMSDU on this TID
393                                  */
394                                 sta->max_tid_amsdu_len[i] = 1;
395                 }
396
397                 IWL_DEBUG_RATE(mvm,
398                                "AMSDU update. AMSDU size: %d, AMSDU selected size: %d, AMSDU TID bitmap 0x%X\n",
399                                le32_to_cpu(notif->amsdu_size), size,
400                                mvmsta->amsdu_enabled);
401         }
402 out:
403         rcu_read_unlock();
404 }
405
406 u16 rs_fw_get_max_amsdu_len(struct ieee80211_sta *sta)
407 {
408         const struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
409         const struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
410
411         if (vht_cap->vht_supported) {
412                 switch (vht_cap->cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK) {
413                 case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
414                         return IEEE80211_MAX_MPDU_LEN_VHT_11454;
415                 case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
416                         return IEEE80211_MAX_MPDU_LEN_VHT_7991;
417                 default:
418                         return IEEE80211_MAX_MPDU_LEN_VHT_3895;
419         }
420
421         } else if (ht_cap->ht_supported) {
422                 if (ht_cap->cap & IEEE80211_HT_CAP_MAX_AMSDU)
423                         /*
424                          * agg is offloaded so we need to assume that agg
425                          * are enabled and max mpdu in ampdu is 4095
426                          * (spec 802.11-2016 9.3.2.1)
427                          */
428                         return IEEE80211_MAX_MPDU_LEN_HT_BA;
429                 else
430                         return IEEE80211_MAX_MPDU_LEN_HT_3839;
431         }
432
433         /* in legacy mode no amsdu is enabled so return zero */
434         return 0;
435 }
436
437 void rs_fw_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
438                      enum nl80211_band band, bool update)
439 {
440         struct ieee80211_hw *hw = mvm->hw;
441         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
442         struct iwl_lq_sta_rs_fw *lq_sta = &mvmsta->lq_sta.rs_fw;
443         u32 cmd_id = iwl_cmd_id(TLC_MNG_CONFIG_CMD, DATA_PATH_GROUP, 0);
444         struct ieee80211_supported_band *sband = hw->wiphy->bands[band];
445         u16 max_amsdu_len = rs_fw_get_max_amsdu_len(sta);
446         struct iwl_tlc_config_cmd cfg_cmd = {
447                 .sta_id = mvmsta->sta_id,
448                 .max_ch_width = update ?
449                         rs_fw_bw_from_sta_bw(sta) : RATE_MCS_CHAN_WIDTH_20,
450                 .flags = cpu_to_le16(rs_fw_get_config_flags(mvm, sta, sband)),
451                 .chains = rs_fw_set_active_chains(iwl_mvm_get_valid_tx_ant(mvm)),
452                 .sgi_ch_width_supp = rs_fw_sgi_cw_support(sta),
453                 .max_mpdu_len = cpu_to_le16(max_amsdu_len),
454                 .amsdu = iwl_mvm_is_csum_supported(mvm),
455         };
456         int ret;
457
458         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
459
460 #ifdef CONFIG_IWLWIFI_DEBUGFS
461         iwl_mvm_reset_frame_stats(mvm);
462 #endif
463         rs_fw_set_supp_rates(sta, sband, &cfg_cmd);
464
465         /*
466          * since TLC offload works with one mode we can assume
467          * that only vht/ht is used and also set it as station max amsdu
468          */
469         sta->max_amsdu_len = max_amsdu_len;
470
471         ret = iwl_mvm_send_cmd_pdu(mvm, cmd_id, CMD_ASYNC, sizeof(cfg_cmd),
472                                    &cfg_cmd);
473         if (ret)
474                 IWL_ERR(mvm, "Failed to send rate scale config (%d)\n", ret);
475 }
476
477 int rs_fw_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
478                         bool enable)
479 {
480         /* TODO: need to introduce a new FW cmd since LQ cmd is not relevant */
481         IWL_DEBUG_RATE(mvm, "tx protection - not implemented yet.\n");
482         return 0;
483 }
484
485 void iwl_mvm_rs_add_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta)
486 {
487         struct iwl_lq_sta_rs_fw *lq_sta = &mvmsta->lq_sta.rs_fw;
488
489         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
490
491         lq_sta->pers.drv = mvm;
492         lq_sta->pers.sta_id = mvmsta->sta_id;
493         lq_sta->pers.chains = 0;
494         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
495         lq_sta->pers.last_rssi = S8_MIN;
496         lq_sta->last_rate_n_flags = 0;
497
498 #ifdef CONFIG_MAC80211_DEBUGFS
499         lq_sta->pers.dbg_fixed_rate = 0;
500 #endif
501 }