rs.c 118.2 KB
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// SPDX-License-Identifier: GPL-2.0-only
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/******************************************************************************
 *
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 * Copyright(c) 2005 - 2014, 2018 - 2021 Intel Corporation. All rights reserved.
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 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
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 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
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 *****************************************************************************/
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/mac80211.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>

#include <linux/workqueue.h>
#include "rs.h"
#include "fw-api.h"
#include "sta.h"
#include "iwl-op-mode.h"
#include "mvm.h"
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#include "debugfs.h"
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#define IWL_RATE_MAX_WINDOW		62	/* # tx in history window */

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/* Calculations of success ratio are done in fixed point where 12800 is 100%.
 * Use this macro when dealing with thresholds consts set as a percentage
 */
#define RS_PERCENT(x) (128 * x)
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static u8 rs_ht_to_legacy[] = {
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	[IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
	[IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
	[IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
	[IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
	[IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
	[IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
	[IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
	[IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
	[IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
	[IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
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};

static const u8 ant_toggle_lookup[] = {
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	[ANT_NONE] = ANT_NONE,
	[ANT_A] = ANT_B,
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	[ANT_B] = ANT_A,
	[ANT_AB] = ANT_AB,
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};

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#define IWL_DECLARE_RATE_INFO(r, s, rp, rn)			      \
	[IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,	      \
				    IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
				    IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
				    IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
				    IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
				    IWL_RATE_##rp##M_INDEX,	      \
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				    IWL_RATE_##rn##M_INDEX }
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#define IWL_DECLARE_MCS_RATE(s)						  \
	[IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,		  \
				       IWL_RATE_HT_SISO_MCS_##s##_PLCP,	  \
				       IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
				       IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
				       IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
				       IWL_RATE_INVM_INDEX,	          \
				       IWL_RATE_INVM_INDEX }

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/*
 * Parameter order:
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 *   rate, ht rate, prev rate, next rate
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 *
 * If there isn't a valid next or previous rate then INV is used which
 * maps to IWL_RATE_INVALID
 *
 */
static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
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	IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
	IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
	IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
	IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
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	IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
	IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
	IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
	IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
	IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
	IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
	IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
	IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
	IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
	IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
	IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
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};

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enum rs_action {
	RS_ACTION_STAY = 0,
	RS_ACTION_DOWNSCALE = -1,
	RS_ACTION_UPSCALE = 1,
};

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enum rs_column_mode {
	RS_INVALID = 0,
	RS_LEGACY,
	RS_SISO,
	RS_MIMO2,
};

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#define MAX_NEXT_COLUMNS 7
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#define MAX_COLUMN_CHECKS 3

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struct rs_tx_column;

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typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
				     struct ieee80211_sta *sta,
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				     struct rs_rate *rate,
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				     const struct rs_tx_column *next_col);
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struct rs_tx_column {
	enum rs_column_mode mode;
	u8 ant;
	bool sgi;
	enum rs_column next_columns[MAX_NEXT_COLUMNS];
	allow_column_func_t checks[MAX_COLUMN_CHECKS];
};

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static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
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			 struct rs_rate *rate,
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			 const struct rs_tx_column *next_col)
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{
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	return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
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}

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static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
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			  struct rs_rate *rate,
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			  const struct rs_tx_column *next_col)
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{
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	if (!sta->deflink.ht_cap.ht_supported)
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		return false;

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	if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC)
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		return false;

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	if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
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		return false;

	if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
		return false;

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	if (mvm->nvm_data->sku_cap_mimo_disabled)
		return false;

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	return true;
}

static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
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			  struct rs_rate *rate,
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			  const struct rs_tx_column *next_col)
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{
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	if (!sta->deflink.ht_cap.ht_supported)
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		return false;

	return true;
}

static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
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			 struct rs_rate *rate,
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			 const struct rs_tx_column *next_col)
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{
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	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
	struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
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	if (is_ht20(rate) && (ht_cap->cap &
			     IEEE80211_HT_CAP_SGI_20))
		return true;
	if (is_ht40(rate) && (ht_cap->cap &
			     IEEE80211_HT_CAP_SGI_40))
		return true;
	if (is_ht80(rate) && (vht_cap->cap &
			     IEEE80211_VHT_CAP_SHORT_GI_80))
		return true;
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	if (is_ht160(rate) && (vht_cap->cap &
			     IEEE80211_VHT_CAP_SHORT_GI_160))
		return true;
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	return false;
}

static const struct rs_tx_column rs_tx_columns[] = {
	[RS_COLUMN_LEGACY_ANT_A] = {
		.mode = RS_LEGACY,
		.ant = ANT_A,
		.next_columns = {
			RS_COLUMN_LEGACY_ANT_B,
			RS_COLUMN_SISO_ANT_A,
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			RS_COLUMN_MIMO2,
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			RS_COLUMN_INVALID,
			RS_COLUMN_INVALID,
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			RS_COLUMN_INVALID,
			RS_COLUMN_INVALID,
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		},
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		.checks = {
			rs_ant_allow,
		},
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	},
	[RS_COLUMN_LEGACY_ANT_B] = {
		.mode = RS_LEGACY,
		.ant = ANT_B,
		.next_columns = {
			RS_COLUMN_LEGACY_ANT_A,
			RS_COLUMN_SISO_ANT_B,
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			RS_COLUMN_MIMO2,
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			RS_COLUMN_INVALID,
			RS_COLUMN_INVALID,
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			RS_COLUMN_INVALID,
			RS_COLUMN_INVALID,
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		},
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		.checks = {
			rs_ant_allow,
		},
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	},
	[RS_COLUMN_SISO_ANT_A] = {
		.mode = RS_SISO,
		.ant = ANT_A,
		.next_columns = {
			RS_COLUMN_SISO_ANT_B,
			RS_COLUMN_MIMO2,
			RS_COLUMN_SISO_ANT_A_SGI,
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			RS_COLUMN_LEGACY_ANT_A,
			RS_COLUMN_LEGACY_ANT_B,
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			RS_COLUMN_INVALID,
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			RS_COLUMN_INVALID,
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		},
		.checks = {
			rs_siso_allow,
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			rs_ant_allow,
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		},
	},
	[RS_COLUMN_SISO_ANT_B] = {
		.mode = RS_SISO,
		.ant = ANT_B,
		.next_columns = {
			RS_COLUMN_SISO_ANT_A,
			RS_COLUMN_MIMO2,
			RS_COLUMN_SISO_ANT_B_SGI,
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			RS_COLUMN_LEGACY_ANT_A,
			RS_COLUMN_LEGACY_ANT_B,
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			RS_COLUMN_INVALID,
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			RS_COLUMN_INVALID,
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		},
		.checks = {
			rs_siso_allow,
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			rs_ant_allow,
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		},
	},
	[RS_COLUMN_SISO_ANT_A_SGI] = {
		.mode = RS_SISO,
		.ant = ANT_A,
		.sgi = true,
		.next_columns = {
			RS_COLUMN_SISO_ANT_B_SGI,
			RS_COLUMN_MIMO2_SGI,
			RS_COLUMN_SISO_ANT_A,
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			RS_COLUMN_LEGACY_ANT_A,
			RS_COLUMN_LEGACY_ANT_B,
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			RS_COLUMN_INVALID,
			RS_COLUMN_INVALID,
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		},
		.checks = {
			rs_siso_allow,
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			rs_ant_allow,
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			rs_sgi_allow,
		},
	},
	[RS_COLUMN_SISO_ANT_B_SGI] = {
		.mode = RS_SISO,
		.ant = ANT_B,
		.sgi = true,
		.next_columns = {
			RS_COLUMN_SISO_ANT_A_SGI,
			RS_COLUMN_MIMO2_SGI,
			RS_COLUMN_SISO_ANT_B,
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			RS_COLUMN_LEGACY_ANT_A,
			RS_COLUMN_LEGACY_ANT_B,
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			RS_COLUMN_INVALID,
			RS_COLUMN_INVALID,
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		},
		.checks = {
			rs_siso_allow,
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			rs_ant_allow,
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			rs_sgi_allow,
		},
	},
	[RS_COLUMN_MIMO2] = {
		.mode = RS_MIMO2,
		.ant = ANT_AB,
		.next_columns = {
			RS_COLUMN_SISO_ANT_A,
			RS_COLUMN_MIMO2_SGI,
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			RS_COLUMN_LEGACY_ANT_A,
			RS_COLUMN_LEGACY_ANT_B,
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			RS_COLUMN_INVALID,
			RS_COLUMN_INVALID,
			RS_COLUMN_INVALID,
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		},
		.checks = {
			rs_mimo_allow,
		},
	},
	[RS_COLUMN_MIMO2_SGI] = {
		.mode = RS_MIMO2,
		.ant = ANT_AB,
		.sgi = true,
		.next_columns = {
			RS_COLUMN_SISO_ANT_A_SGI,
			RS_COLUMN_MIMO2,
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			RS_COLUMN_LEGACY_ANT_A,
			RS_COLUMN_LEGACY_ANT_B,
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			RS_COLUMN_INVALID,
			RS_COLUMN_INVALID,
			RS_COLUMN_INVALID,
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		},
		.checks = {
			rs_mimo_allow,
			rs_sgi_allow,
		},
	},
};

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static inline u8 rs_extract_rate(u32 rate_n_flags)
{
	/* also works for HT because bits 7:6 are zero there */
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	return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK_V1);
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}

static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
{
	int idx = 0;

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	if (rate_n_flags & RATE_MCS_HT_MSK_V1) {
		idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK_V1;
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		idx += IWL_RATE_MCS_0_INDEX;
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		/* skip 9M not supported in HT*/
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		if (idx >= IWL_RATE_9M_INDEX)
			idx += 1;
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		if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
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			return idx;
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	} else if (rate_n_flags & RATE_MCS_VHT_MSK_V1 ||
		   rate_n_flags & RATE_MCS_HE_MSK_V1) {
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		idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
		idx += IWL_RATE_MCS_0_INDEX;
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		/* skip 9M not supported in VHT*/
		if (idx >= IWL_RATE_9M_INDEX)
			idx++;
		if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
			return idx;
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		if ((rate_n_flags & RATE_MCS_HE_MSK_V1) &&
		    idx <= IWL_LAST_HE_RATE)
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			return idx;
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	} else {
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		/* legacy rate format, search for match in table */

		u8 legacy_rate = rs_extract_rate(rate_n_flags);
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		for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
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			if (iwl_rates[idx].plcp == legacy_rate)
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				return idx;
	}

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	return IWL_RATE_INVALID;
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}

static void rs_rate_scale_perform(struct iwl_mvm *mvm,
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				  struct ieee80211_sta *sta,
				  struct iwl_lq_sta *lq_sta,
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				  int tid, bool ndp);
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static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
			   struct ieee80211_sta *sta,
			   struct iwl_lq_sta *lq_sta,
			   const struct rs_rate *initial_rate);
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static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);

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/*
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 * The following tables contain the expected throughput metrics for all rates
 *
 *	1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 *
 * where invalid entries are zeros.
 *
 * CCK rates are only valid in legacy table and will only be used in G
 * (2.4 GHz) band.
 */
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static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
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	7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
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};

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/* Expected TpT tables. 4 indexes:
 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 */
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static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
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	{0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
	{0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
	{0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
	{0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
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};

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static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
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	{0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
	{0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
	{0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
	{0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
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};

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static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
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	{0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
	{0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
	{0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
	{0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
};

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static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
	{0, 0, 0, 0, 191, 0, 244, 288,  298,  308,  313,  318,  323,  328,  330},
	{0, 0, 0, 0, 200, 0, 251, 293,  302,  312,  317,  322,  327,  332,  334},
	{0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
	{0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
};

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static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
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	{0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
	{0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
	{0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
	{0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
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};

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static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
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	{0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
	{0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
	{0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
	{0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
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};

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static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
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	{0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
	{0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
	{0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
	{0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
};

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static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
	{0, 0, 0, 0, 240, 0, 278,  308,  313,  319,  322,  324,  328,  330,   334},
	{0, 0, 0, 0, 247, 0, 282,  310,  315,  320,  323,  325,  329,  332,   338},
	{0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629,  10592},
	{0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
};

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static const char *rs_pretty_lq_type(enum iwl_table_type type)
{
	static const char * const lq_types[] = {
		[LQ_NONE] = "NONE",
		[LQ_LEGACY_A] = "LEGACY_A",
		[LQ_LEGACY_G] = "LEGACY_G",
		[LQ_HT_SISO] = "HT SISO",
		[LQ_HT_MIMO2] = "HT MIMO",
		[LQ_VHT_SISO] = "VHT SISO",
		[LQ_VHT_MIMO2] = "VHT MIMO",
467 468
		[LQ_HE_SISO] = "HE SISO",
		[LQ_HE_MIMO2] = "HE MIMO",
469 470 471 472 473 474 475 476
	};

	if (type < LQ_NONE || type >= LQ_MAX)
		return "UNKNOWN";

	return lq_types[type];
}

477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507
static char *rs_pretty_rate(const struct rs_rate *rate)
{
	static char buf[40];
	static const char * const legacy_rates[] = {
		[IWL_RATE_1M_INDEX] = "1M",
		[IWL_RATE_2M_INDEX] = "2M",
		[IWL_RATE_5M_INDEX] = "5.5M",
		[IWL_RATE_11M_INDEX] = "11M",
		[IWL_RATE_6M_INDEX] = "6M",
		[IWL_RATE_9M_INDEX] = "9M",
		[IWL_RATE_12M_INDEX] = "12M",
		[IWL_RATE_18M_INDEX] = "18M",
		[IWL_RATE_24M_INDEX] = "24M",
		[IWL_RATE_36M_INDEX] = "36M",
		[IWL_RATE_48M_INDEX] = "48M",
		[IWL_RATE_54M_INDEX] = "54M",
	};
	static const char *const ht_vht_rates[] = {
		[IWL_RATE_MCS_0_INDEX] = "MCS0",
		[IWL_RATE_MCS_1_INDEX] = "MCS1",
		[IWL_RATE_MCS_2_INDEX] = "MCS2",
		[IWL_RATE_MCS_3_INDEX] = "MCS3",
		[IWL_RATE_MCS_4_INDEX] = "MCS4",
		[IWL_RATE_MCS_5_INDEX] = "MCS5",
		[IWL_RATE_MCS_6_INDEX] = "MCS6",
		[IWL_RATE_MCS_7_INDEX] = "MCS7",
		[IWL_RATE_MCS_8_INDEX] = "MCS8",
		[IWL_RATE_MCS_9_INDEX] = "MCS9",
	};
	const char *rate_str;

508
	if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
509
		rate_str = legacy_rates[rate->index];
510
	else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
511
		 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
512
		 (rate->index <= IWL_RATE_MCS_9_INDEX))
513 514 515 516 517
		rate_str = ht_vht_rates[rate->index];
	else
		rate_str = "BAD_RATE";

	sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
518
		iwl_rs_pretty_ant(rate->ant), rate_str);
519 520 521
	return buf;
}

522 523 524
static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
				const char *prefix)
{
525
	IWL_DEBUG_RATE(mvm,
526 527 528
		       "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
		       prefix, rs_pretty_rate(rate), rate->bw,
		       rate->sgi, rate->ldpc, rate->stbc);
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}

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static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
{
	window->data = 0;
	window->success_counter = 0;
	window->success_ratio = IWL_INVALID_VALUE;
	window->counter = 0;
	window->average_tpt = IWL_INVALID_VALUE;
}

540 541
static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
					    struct iwl_scale_tbl_info *tbl)
542 543 544
{
	int i;

545
	IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
546 547
	for (i = 0; i < IWL_RATE_COUNT; i++)
		rs_rate_scale_clear_window(&tbl->win[i]);
548 549 550

	for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
		rs_rate_scale_clear_window(&tbl->tpc_win[i]);
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}

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static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
{
	return (ant_type & valid_antenna) == ant_type;
}

static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
559 560
				     struct iwl_lq_sta *lq_data, u8 tid,
				     struct ieee80211_sta *sta)
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{
562
	int ret;
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564 565
	IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
		     sta->addr, tid);
566 567 568

	/* start BA session until the peer sends del BA */
	ret = ieee80211_start_tx_ba_session(sta, tid, 0);
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	if (ret == -EAGAIN) {
		/*
		 * driver and mac80211 is out of sync
		 * this might be cause by reloading firmware
		 * stop the tx ba session here
		 */
		IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
			tid);
		ieee80211_stop_tx_ba_session(sta, tid);
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	}
	return ret;
}

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static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
			      u8 tid, struct iwl_lq_sta *lq_sta,
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			      struct ieee80211_sta *sta)
{
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	struct iwl_mvm_tid_data *tid_data;

	/*
	 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
	 * when the frame is not QoS
	 */
	if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
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		IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
			tid, IWL_MAX_TID_COUNT);
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		return;
	} else if (tid == IWL_MAX_TID_COUNT) {
		return;
	}

	tid_data = &mvmsta->tid_data[tid];
601 602
	if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED &&
	    tid_data->state == IWL_AGG_OFF &&
603
	    (lq_sta->tx_agg_tid_en & BIT(tid)) &&
604
	    tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) {
605
		IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
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		if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
			tid_data->state = IWL_AGG_QUEUED;
608
	}
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}

static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
{
	return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
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	       !!(rate_n_flags & RATE_MCS_ANT_B_MSK);
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}

/*
 * Static function to get the expected throughput from an iwl_scale_tbl_info
 * that wraps a NULL pointer check
 */
static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
{
	if (tbl->expected_tpt)
		return tbl->expected_tpt[rs_index];
	return 0;
}

628
/*
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 * rs_collect_tx_data - Update the success/failure sliding window
 *
 * We keep a sliding window of the last 62 packets transmitted
 * at this rate.  window->data contains the bitmask of successful
 * packets.
 */
635 636
static int _rs_collect_tx_data(struct iwl_mvm *mvm,
			       struct iwl_scale_tbl_info *tbl,
637 638
			       int scale_index, int attempts, int successes,
			       struct iwl_rate_scale_data *window)
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{
	static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
	s32 fail_count, tpt;

	/* Get expected throughput */
	tpt = get_expected_tpt(tbl, scale_index);

	/*
	 * Keep track of only the latest 62 tx frame attempts in this rate's
	 * history window; anything older isn't really relevant any more.
	 * If we have filled up the sliding window, drop the oldest attempt;
	 * if the oldest attempt (highest bit in bitmap) shows "success",
	 * subtract "1" from the success counter (this is the main reason
	 * we keep these bitmaps!).
	 */
	while (attempts > 0) {
		if (window->counter >= IWL_RATE_MAX_WINDOW) {
			/* remove earliest */
			window->counter = IWL_RATE_MAX_WINDOW - 1;

			if (window->data & mask) {
				window->data &= ~mask;
				window->success_counter--;
			}
		}

		/* Increment frames-attempted counter */
		window->counter++;

		/* Shift bitmap by one frame to throw away oldest history */
		window->data <<= 1;

		/* Mark the most recent #successes attempts as successful */
		if (successes > 0) {
			window->success_counter++;
			window->data |= 0x1;
			successes--;
		}

		attempts--;
	}

	/* Calculate current success ratio, avoid divide-by-0! */
	if (window->counter > 0)
		window->success_ratio = 128 * (100 * window->success_counter)
					/ window->counter;
	else
		window->success_ratio = IWL_INVALID_VALUE;

	fail_count = window->counter - window->success_counter;

	/* Calculate average throughput, if we have enough history. */
691 692
	if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
	    (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
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		window->average_tpt = (window->success_ratio * tpt + 64) / 128;
	else
		window->average_tpt = IWL_INVALID_VALUE;

	return 0;
}

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static int rs_collect_tpc_data(struct iwl_mvm *mvm,
			       struct iwl_lq_sta *lq_sta,
			       struct iwl_scale_tbl_info *tbl,
			       int scale_index, int attempts, int successes,
			       u8 reduced_txp)
{
	struct iwl_rate_scale_data *window = NULL;

	if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
		return -EINVAL;

	window = &tbl->tpc_win[reduced_txp];
	return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
				    window);
}

716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745
static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
				    struct iwl_mvm_sta *mvmsta,
				    u8 tid, int successes)
{
	struct iwl_mvm_tid_data *tid_data;

	if (tid >= IWL_MAX_TID_COUNT)
		return;

	tid_data = &mvmsta->tid_data[tid];

	/*
	 * Measure if there're enough successful transmits per second.
	 * These statistics are used only to decide if we can start a
	 * BA session, so it should be updated only when A-MPDU is
	 * off.
	 */
	if (tid_data->state != IWL_AGG_OFF)
		return;

	if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
	    (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
		tid_data->tx_count_last = tid_data->tx_count;
		tid_data->tx_count = 0;
		tid_data->tpt_meas_start = jiffies;
	} else {
		tid_data->tx_count += successes;
	}
}

746
static int rs_collect_tlc_data(struct iwl_mvm *mvm,
747
			       struct iwl_mvm_sta *mvmsta, u8 tid,
748 749
			       struct iwl_scale_tbl_info *tbl,
			       int scale_index, int attempts, int successes)
750 751 752 753 754 755
{
	struct iwl_rate_scale_data *window = NULL;

	if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
		return -EINVAL;

756
	if (tbl->column != RS_COLUMN_INVALID) {
757
		struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers;
758 759 760

		pers->tx_stats[tbl->column][scale_index].total += attempts;
		pers->tx_stats[tbl->column][scale_index].success += successes;
761 762
	}

763 764
	rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);

765 766
	/* Select window for current tx bit rate */
	window = &(tbl->win[scale_index]);
767
	return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
768 769 770
				   window);
}

771 772
/* Convert rs_rate object into ucode rate bitmask */
static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
773
				  struct rs_rate *rate)
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{
775 776
	u32 ucode_rate = 0;
	int index = rate->index;
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778
	ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
779
			 RATE_MCS_ANT_AB_MSK);
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781 782
	if (is_legacy(rate)) {
		ucode_rate |= iwl_rates[index].plcp;
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		if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
784
			ucode_rate |= RATE_MCS_CCK_MSK_V1;
785
		return ucode_rate;
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	}

788 789 790 791 792 793
	/* set RTS protection for all non legacy rates
	 * This helps with congested environments reducing the conflict cost to
	 * RTS retries only, instead of the entire BA packet.
	 */
	ucode_rate |= RATE_MCS_RTS_REQUIRED_MSK;

794
	if (is_ht(rate)) {
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		if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
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			IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
797
			index = IWL_LAST_HT_RATE;
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		}
799
		ucode_rate |= RATE_MCS_HT_MSK_V1;
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801 802 803 804
		if (is_ht_siso(rate))
			ucode_rate |= iwl_rates[index].plcp_ht_siso;
		else if (is_ht_mimo2(rate))
			ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
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		else
806
			WARN_ON_ONCE(1);
807
	} else if (is_vht(rate)) {
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		if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
			IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
			index = IWL_LAST_VHT_RATE;
		}
812
		ucode_rate |= RATE_MCS_VHT_MSK_V1;
813 814 815 816
		if (is_vht_siso(rate))
			ucode_rate |= iwl_rates[index].plcp_vht_siso;
		else if (is_vht_mimo2(rate))
			ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
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		else
			WARN_ON_ONCE(1);

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	} else {
821
		IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
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	}

824 825 826
	if (is_siso(rate) && rate->stbc) {
		/* To enable STBC we need to set both a flag and ANT_AB */
		ucode_rate |= RATE_MCS_ANT_AB_MSK;
827
		ucode_rate |= RATE_MCS_STBC_MSK;
828 829
	}

830 831
	ucode_rate |= rate->bw;
	if (rate->sgi)
832
		ucode_rate |= RATE_MCS_SGI_MSK_V1;
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	if (rate->ldpc)
834
		ucode_rate |= RATE_MCS_LDPC_MSK_V1;
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836
	return ucode_rate;
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}

839 840
/* Convert a ucode rate into an rs_rate object */
static int rs_rate_from_ucode_rate(const u32 ucode_rate,
841
				   enum nl80211_band band,
842
				   struct rs_rate *rate)
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{
844
	u32 ant_msk = ucode_rate & RATE_MCS_ANT_AB_MSK;
845
	u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
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	u8 nss;
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848
	memset(rate, 0, sizeof(*rate));
849
	rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
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851
	if (rate->index == IWL_RATE_INVALID)
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		return -EINVAL;
853 854

	rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
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	/* Legacy */
857 858 859
	if (!(ucode_rate & RATE_MCS_HT_MSK_V1) &&
	    !(ucode_rate & RATE_MCS_VHT_MSK_V1) &&
	    !(ucode_rate & RATE_MCS_HE_MSK_V1)) {
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		if (num_of_ant == 1) {
861
			if (band == NL80211_BAND_5GHZ)
862
				rate->type = LQ_LEGACY_A;
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			else
864
				rate->type = LQ_LEGACY_G;
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		}
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		return 0;
	}

870
	/* HT, VHT or HE */
871
	if (ucode_rate & RATE_MCS_SGI_MSK_V1)
872
		rate->sgi = true;
873
	if (ucode_rate & RATE_MCS_LDPC_MSK_V1)
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		rate->ldpc = true;
875
	if (ucode_rate & RATE_MCS_STBC_MSK)
876
		rate->stbc = true;
877 878
	if (ucode_rate & RATE_MCS_BF_MSK)
		rate->bfer = true;
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880
	rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK_V1;
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882 883 884
	if (ucode_rate & RATE_MCS_HT_MSK_V1) {
		nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK_V1) >>
		       RATE_HT_MCS_NSS_POS_V1) + 1;
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		if (nss == 1) {
887
			rate->type = LQ_HT_SISO;
888 889 890
			WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
				  "stbc %d bfer %d",
				  rate->stbc, rate->bfer);
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		} else if (nss == 2) {
892
			rate->type = LQ_HT_MIMO2;
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			WARN_ON_ONCE(num_of_ant != 2);
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		} else {
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			WARN_ON_ONCE(1);
		}
897
	} else if (ucode_rate & RATE_MCS_VHT_MSK_V1) {
898
		nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
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		       RATE_VHT_MCS_NSS_POS) + 1;

		if (nss == 1) {
902
			rate->type = LQ_VHT_SISO;
903 904 905
			WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
				  "stbc %d bfer %d",
				  rate->stbc, rate->bfer);
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		} else if (nss == 2) {
907
			rate->type = LQ_VHT_MIMO2;
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			WARN_ON_ONCE(num_of_ant != 2);
		} else {
			WARN_ON_ONCE(1);
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		}
912
	} else if (ucode_rate & RATE_MCS_HE_MSK_V1) {
913 914 915 916 917 918 919 920 921 922 923 924 925
		nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
		      RATE_VHT_MCS_NSS_POS) + 1;

		if (nss == 1) {
			rate->type = LQ_HE_SISO;
			WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
				  "stbc %d bfer %d", rate->stbc, rate->bfer);
		} else if (nss == 2) {
			rate->type = LQ_HE_MIMO2;
			WARN_ON_ONCE(num_of_ant != 2);
		} else {
			WARN_ON_ONCE(1);
		}
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	}
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928
	WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
929
		     !is_he(rate) && !is_vht(rate));
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	return 0;
}

/* switch to another antenna/antennas and return 1 */
/* if no other valid antenna found, return 0 */
936
static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
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{
	u8 new_ant_type;

940
	if (!rs_is_valid_ant(valid_ant, rate->ant))
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		return 0;

943
	new_ant_type = ant_toggle_lookup[rate->ant];
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945
	while ((new_ant_type != rate->ant) &&
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946 947 948
	       !rs_is_valid_ant(valid_ant, new_ant_type))
		new_ant_type = ant_toggle_lookup[new_ant_type];

949
	if (new_ant_type == rate->ant)
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950 951
		return 0;

952 953
	rate->ant = new_ant_type;

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	return 1;
}

static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
958
				  struct rs_rate *rate)
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{
960
	if (is_legacy(rate))
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		return lq_sta->active_legacy_rate;
962
	else if (is_siso(rate))
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		return lq_sta->active_siso_rate;
964
	else if (is_mimo2(rate))
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965 966 967 968
		return lq_sta->active_mimo2_rate;

	WARN_ON_ONCE(1);
	return 0;
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}

static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
				int rate_type)
{
	u8 high = IWL_RATE_INVALID;
	u8 low = IWL_RATE_INVALID;

	/* 802.11A or ht walks to the next literal adjacent rate in
	 * the rate table */
979
	if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
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980 981 982 983 984
		int i;
		u32 mask;

		/* Find the previous rate that is in the rate mask */
		i = index - 1;
985 986 987
		if (i >= 0)
			mask = BIT(i);
		for (; i >= 0; i--, mask >>= 1) {
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988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
			if (rate_mask & mask) {
				low = i;
				break;
			}
		}

		/* Find the next rate that is in the rate mask */
		i = index + 1;
		for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
			if (rate_mask & mask) {
				high = i;
				break;
			}
		}

		return (high << 8) | low;
	}

	low = index;
	while (low != IWL_RATE_INVALID) {
		low = iwl_rates[low].prev_rs;
		if (low == IWL_RATE_INVALID)
			break;
		if (rate_mask & (1 << low))
			break;
	}

	high = index;
	while (high != IWL_RATE_INVALID) {
		high = iwl_rates[high].next_rs;
		if (high == IWL_RATE_INVALID)
			break;
		if (rate_mask & (1 << high))
			break;
	}

	return (high << 8) | low;
}

1027 1028
static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
				     struct rs_rate *rate)
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{
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
	return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
}

/* Get the next supported lower rate in the current column.
 * Return true if bottom rate in the current column was reached
 */
static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
					struct rs_rate *rate)
{
	u8 low;
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	u16 high_low;
1041
	u16 rate_mask;
1042
	struct iwl_mvm *mvm = lq_sta->pers.drv;
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060

	rate_mask = rs_get_supported_rates(lq_sta, rate);
	high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
					rate->type);
	low = high_low & 0xff;

	/* Bottom rate of column reached */
	if (low == IWL_RATE_INVALID)
		return true;

	rate->index = low;
	return false;
}

/* Get the next rate to use following a column downgrade */
static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
					  struct rs_rate *rate)
{
1061
	struct iwl_mvm *mvm = lq_sta->pers.drv;
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1063 1064 1065 1066 1067
	if (is_legacy(rate)) {
		/* No column to downgrade from Legacy */
		return;
	} else if (is_siso(rate)) {
		/* Downgrade to Legacy if we were in SISO */
1068
		if (lq_sta->band == NL80211_BAND_5GHZ)
1069
			rate->type = LQ_LEGACY_A;
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		else
1071
			rate->type = LQ_LEGACY_G;
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1073
		rate->bw = RATE_MCS_CHAN_WIDTH_20;
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1075
		WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1076
			     rate->index > IWL_RATE_MCS_9_INDEX);
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1078
		rate->index = rs_ht_to_legacy[rate->index];
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		rate->ldpc = false;
1080 1081 1082 1083
	} else {
		/* Downgrade to SISO with same MCS if in MIMO  */
		rate->type = is_vht_mimo2(rate) ?
			LQ_VHT_SISO : LQ_HT_SISO;
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	}

1086
	if (num_of_ant(rate->ant) > 1)
1087
		rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
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1089 1090 1091 1092 1093
	/* Relevant in both switching to SISO or Legacy */
	rate->sgi = false;

	if (!rs_rate_supported(lq_sta, rate))
		rs_get_lower_rate_in_column(lq_sta, rate);
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}

1096 1097 1098
/* Check if both rates share the same column */
static inline bool rs_rate_column_match(struct rs_rate *a,
					struct rs_rate *b)
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{
1100 1101
	bool ant_match;

1102
	if (a->stbc || a->bfer)
1103 1104 1105 1106 1107 1108
		ant_match = (b->ant == ANT_A || b->ant == ANT_B);
	else
		ant_match = (a->ant == b->ant);

	return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
		&& ant_match;
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}

1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
{
	if (is_legacy(rate)) {
		if (rate->ant == ANT_A)
			return RS_COLUMN_LEGACY_ANT_A;

		if (rate->ant == ANT_B)
			return RS_COLUMN_LEGACY_ANT_B;

		goto err;
	}

	if (is_siso(rate)) {
		if (rate->ant == ANT_A || rate->stbc || rate->bfer)
			return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
				RS_COLUMN_SISO_ANT_A;

		if (rate->ant == ANT_B)
			return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
				RS_COLUMN_SISO_ANT_B;

		goto err;
	}

	if (is_mimo(rate))
		return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;

err:
	return RS_COLUMN_INVALID;
}

1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
static u8 rs_get_tid(struct ieee80211_hdr *hdr)
{
	u8 tid = IWL_MAX_TID_COUNT;

	if (ieee80211_is_data_qos(hdr->frame_control)) {
		u8 *qc = ieee80211_get_qos_ctl(hdr);
		tid = qc[0] & 0xf;
	}

	if (unlikely(tid > IWL_MAX_TID_COUNT))
		tid = IWL_MAX_TID_COUNT;

	return tid;
}

/*
 * mac80211 sends us Tx status
 */
1160 1161 1162 1163
static void rs_drv_mac80211_tx_status(void *mvm_r,
				      struct ieee80211_supported_band *sband,
				      struct ieee80211_sta *sta, void *priv_sta,
				      struct sk_buff *skb)
1164 1165
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1166
	struct iwl_op_mode *op_mode = mvm_r;
1167 1168
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1169
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1170

1171
	if (!mvmsta->vif)
1172 1173
		return;

1174 1175 1176 1177
	if (!ieee80211_is_data(hdr->frame_control) ||
	    info->flags & IEEE80211_TX_CTL_NO_ACK)
		return;

1178 1179
	iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
			     ieee80211_is_qos_nullfunc(hdr->frame_control));
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}

/*
 * Begin a period of staying with a selected modulation mode.
 * Set "stay_in_tbl" flag to prevent any mode switches.
 * Set frame tx success limits according to legacy vs. high-throughput,
 * and reset overall (spanning all rates) tx success history statistics.
 * These control how long we stay using same modulation mode before
 * searching for a new mode.
 */
static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
				 struct iwl_lq_sta *lq_sta)
{
1193 1194
	IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
	lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
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	if (is_legacy) {
1196 1197 1198
		lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
		lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
		lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
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	} else {
1200 1201 1202
		lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
		lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
		lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
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	}
	lq_sta->table_count = 0;
	lq_sta->total_failed = 0;
	lq_sta->total_success = 0;
	lq_sta->flush_timer = jiffies;
1208
	lq_sta->visited_columns = 0;
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}

1211 1212 1213 1214 1215 1216 1217
static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
{
	if (rate_mask)
		return find_last_bit(&rate_mask, BITS_PER_LONG);
	return IWL_RATE_INVALID;
}

1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
				   const struct rs_tx_column *column)
{
	switch (column->mode) {
	case RS_LEGACY:
		return lq_sta->max_legacy_rate_idx;
	case RS_SISO:
		return lq_sta->max_siso_rate_idx;
	case RS_MIMO2:
		return lq_sta->max_mimo2_rate_idx;
	default:
		WARN_ON_ONCE(1);
	}

	return lq_sta->max_legacy_rate_idx;
}

1235
static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1236 1237
					    const struct rs_tx_column *column,
					    u32 bw)
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1238 1239
{
	/* Used to choose among HT tables */
1240
	const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
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1242 1243 1244 1245
	if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
			 column->mode != RS_SISO &&
			 column->mode != RS_MIMO2))
		return expected_tpt_legacy;
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	/* Legacy rates have only one table */
1248 1249
	if (column->mode == RS_LEGACY)
		return expected_tpt_legacy;
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	ht_tbl_pointer = expected_tpt_mimo2_20MHz;
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	/* Choose among many HT tables depending on number of streams
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	 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
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	 * status */
1255 1256
	if (column->mode == RS_SISO) {
		switch (bw) {
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		case RATE_MCS_CHAN_WIDTH_20:
			ht_tbl_pointer = expected_tpt_siso_20MHz;
			break;
		case RATE_MCS_CHAN_WIDTH_40:
			ht_tbl_pointer = expected_tpt_siso_40MHz;
			break;
		case RATE_MCS_CHAN_WIDTH_80:
			ht_tbl_pointer = expected_tpt_siso_80MHz;
			break;
1266 1267 1268
		case RATE_MCS_CHAN_WIDTH_160:
			ht_tbl_pointer = expected_tpt_siso_160MHz;
			break;
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1269 1270 1271
		default:
			WARN_ON_ONCE(1);
		}
1272 1273
	} else if (column->mode == RS_MIMO2) {
		switch (bw) {
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1274 1275 1276 1277 1278 1279 1280 1281 1282
		case RATE_MCS_CHAN_WIDTH_20:
			ht_tbl_pointer = expected_tpt_mimo2_20MHz;
			break;
		case RATE_MCS_CHAN_WIDTH_40:
			ht_tbl_pointer = expected_tpt_mimo2_40MHz;
			break;
		case RATE_MCS_CHAN_WIDTH_80:
			ht_tbl_pointer = expected_tpt_mimo2_80MHz;
			break;
1283 1284 1285
		case RATE_MCS_CHAN_WIDTH_160:
			ht_tbl_pointer = expected_tpt_mimo2_160MHz;
			break;
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1286 1287 1288 1289 1290
		default:
			WARN_ON_ONCE(1);
		}
	} else {
		WARN_ON_ONCE(1);
1291
	}
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1293 1294 1295 1296 1297 1298
	if (!column->sgi && !lq_sta->is_agg)		/* Normal */
		return ht_tbl_pointer[0];
	else if (column->sgi && !lq_sta->is_agg)        /* SGI */
		return ht_tbl_pointer[1];
	else if (!column->sgi && lq_sta->is_agg)        /* AGG */
		return ht_tbl_pointer[2];
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	else						/* AGG+SGI */
1300 1301 1302 1303 1304 1305 1306 1307 1308 1309
		return ht_tbl_pointer[3];
}

static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
				      struct iwl_scale_tbl_info *tbl)
{
	struct rs_rate *rate = &tbl->rate;
	const struct rs_tx_column *column = &rs_tx_columns[tbl->column];

	tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
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}

1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323
/* rs uses two tables, one is active and the second is for searching better
 * configuration. This function, according to the index of the currently
 * active table returns the search table, which is located at the
 * index complementary to 1 according to the active table (active = 1,
 * search = 0 or active = 0, search = 1).
 * Since lq_info is an arary of size 2, make sure index cannot be out of bounds.
 */
static inline u8 rs_search_tbl(u8 active_tbl)
{
	return (active_tbl ^ 1) & 1;
}

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static s32 rs_get_best_rate(struct iwl_mvm *mvm,
			    struct iwl_lq_sta *lq_sta,
			    struct iwl_scale_tbl_info *tbl,	/* "search" */
1327
			    unsigned long rate_mask, s8 index)
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1328 1329 1330
{
	struct iwl_scale_tbl_info *active_tbl =
	    &(lq_sta->lq_info[lq_sta->active_tbl]);
1331 1332
	s32 success_ratio = active_tbl->win[index].success_ratio;
	u16 expected_current_tpt = active_tbl->expected_tpt[index];
1333
	const u16 *tpt_tbl = tbl->expected_tpt;
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1334
	u16 high_low;
1335 1336
	u32 target_tpt;
	int rate_idx;
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1337

1338
	if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1339 1340 1341 1342 1343 1344 1345
		target_tpt = 100 * expected_current_tpt;
		IWL_DEBUG_RATE(mvm,
			       "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
			       success_ratio, target_tpt);
	} else {
		target_tpt = lq_sta->last_tpt;
		IWL_DEBUG_RATE(mvm,
1346
			       "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1347 1348
			       success_ratio, target_tpt);
	}
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1349

1350
	rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
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1352 1353 1354
	while (rate_idx != IWL_RATE_INVALID) {
		if (target_tpt < (100 * tpt_tbl[rate_idx]))
			break;
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1355

1356 1357
		high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
						tbl->rate.type);
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1358

1359
		rate_idx = (high_low >> 8) & 0xff;
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1360 1361
	}

1362 1363 1364 1365 1366 1367
	IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
		       rate_idx, target_tpt,
		       rate_idx != IWL_RATE_INVALID ?
		       100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);

	return rate_idx;
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}

1370
static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
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1371
{
1372
	struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->deflink.vht_cap;
1373 1374 1375 1376 1377
	struct ieee80211_vht_cap vht_cap = {
		.vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
		.supp_mcs = sta_vht_cap->vht_mcs,
	};

1378
	switch (sta->deflink.bandwidth) {
1379
	case IEEE80211_STA_RX_BW_160:
1380 1381 1382 1383 1384 1385 1386 1387 1388 1389
		/*
		 * Don't use 160 MHz if VHT extended NSS support
		 * says we cannot use 2 streams, we don't want to
		 * deal with this.
		 * We only check MCS 0 - they will support that if
		 * we got here at all and we don't care which MCS,
		 * we want to determine a more global state.
		 */
		if (ieee80211_get_vht_max_nss(&vht_cap,
					      IEEE80211_VHT_CHANWIDTH_160MHZ,
1390
					      0, true,
1391
					      sta->deflink.rx_nss) < sta->deflink.rx_nss)
1392
			return RATE_MCS_CHAN_WIDTH_80;
1393 1394
		return RATE_MCS_CHAN_WIDTH_160;
	case IEEE80211_STA_RX_BW_80:
1395
		return RATE_MCS_CHAN_WIDTH_80;
1396
	case IEEE80211_STA_RX_BW_40:
1397
		return RATE_MCS_CHAN_WIDTH_40;
1398 1399 1400 1401
	case IEEE80211_STA_RX_BW_20:
	default:
		return RATE_MCS_CHAN_WIDTH_20;
	}
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1402 1403
}

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/*
 * Check whether we should continue using same modulation mode, or
 * begin search for a new mode, based on:
 * 1) # tx successes or failures while using this mode
 * 2) # times calling this function
 * 3) elapsed time in this mode (not used, for now)
 */
static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
{
	struct iwl_scale_tbl_info *tbl;
	int active_tbl;
	int flush_interval_passed = 0;
	struct iwl_mvm *mvm;

1418
	mvm = lq_sta->pers.drv;
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	active_tbl = lq_sta->active_tbl;

	tbl = &(lq_sta->lq_info[active_tbl]);

	/* If we've been disallowing search, see if we should now allow it */
1424
	if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
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1425 1426 1427 1428 1429
		/* Elapsed time using current modulation mode */
		if (lq_sta->flush_timer)
			flush_interval_passed =
				time_after(jiffies,
					   (unsigned long)(lq_sta->flush_timer +
1430
							   (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
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1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451

		/*
		 * Check if we should allow search for new modulation mode.
		 * If many frames have failed or succeeded, or we've used
		 * this same modulation for a long time, allow search, and
		 * reset history stats that keep track of whether we should
		 * allow a new search.  Also (below) reset all bitmaps and
		 * stats in active history.
		 */
		if (force_search ||
		    (lq_sta->total_failed > lq_sta->max_failure_limit) ||
		    (lq_sta->total_success > lq_sta->max_success_limit) ||
		    ((!lq_sta->search_better_tbl) &&
		     (lq_sta->flush_timer) && (flush_interval_passed))) {
			IWL_DEBUG_RATE(mvm,
				       "LQ: stay is expired %d %d %d\n",
				     lq_sta->total_failed,
				     lq_sta->total_success,
				     flush_interval_passed);

			/* Allow search for new mode */
1452 1453 1454
			lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
			IWL_DEBUG_RATE(mvm,
				       "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
J
Johannes Berg 已提交
1455 1456 1457
			lq_sta->total_failed = 0;
			lq_sta->total_success = 0;
			lq_sta->flush_timer = 0;
1458 1459
			/* mark the current column as visited */
			lq_sta->visited_columns = BIT(tbl->column);
J
Johannes Berg 已提交
1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
		/*
		 * Else if we've used this modulation mode enough repetitions
		 * (regardless of elapsed time or success/failure), reset
		 * history bitmaps and rate-specific stats for all rates in
		 * active table.
		 */
		} else {
			lq_sta->table_count++;
			if (lq_sta->table_count >=
			    lq_sta->table_count_limit) {
				lq_sta->table_count = 0;

				IWL_DEBUG_RATE(mvm,
					       "LQ: stay in table clear win\n");
1474
				rs_rate_scale_clear_tbl_windows(mvm, tbl);
J
Johannes Berg 已提交
1475 1476 1477 1478 1479 1480
			}
		}

		/* If transitioning to allow "search", reset all history
		 * bitmaps and stats in active table (this will become the new
		 * "search" table). */
1481
		if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1482
			rs_rate_scale_clear_tbl_windows(mvm, tbl);
J
Johannes Berg 已提交
1483 1484 1485 1486
		}
	}
}

1487 1488 1489 1490
static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
			     struct iwl_scale_tbl_info *tbl,
			     enum rs_action scale_action)
{
1491
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1492
	int i;
1493

1494 1495
	sta->max_amsdu_len = rs_fw_get_max_amsdu_len(sta);

1496 1497 1498 1499
	/*
	 * In case TLC offload is not active amsdu_enabled is either 0xFFFF
	 * or 0, since there is no per-TID alg.
	 */
1500 1501 1502
	if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
	    tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
	    scale_action == RS_ACTION_DOWNSCALE)
1503
		mvmsta->amsdu_enabled = 0;
1504
	else
1505 1506
		mvmsta->amsdu_enabled = 0xFFFF;

1507 1508 1509 1510 1511 1512
	if (mvmsta->vif->bss_conf.he_support &&
	    !iwlwifi_mod_params.disable_11ax)
		mvmsta->max_amsdu_len = sta->max_amsdu_len;
	else
		mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500);

1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525
	sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;

	for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
		if (mvmsta->amsdu_enabled)
			sta->max_tid_amsdu_len[i] =
				iwl_mvm_max_amsdu_size(mvm, sta, i);
		else
			/*
			 * Not so elegant, but this will effectively
			 * prevent AMSDU on this TID
			 */
			sta->max_tid_amsdu_len[i] = 1;
	}
1526 1527
}

J
Johannes Berg 已提交
1528 1529 1530 1531
/*
 * setup rate table in uCode
 */
static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1532
			       struct ieee80211_sta *sta,
J
Johannes Berg 已提交
1533
			       struct iwl_lq_sta *lq_sta,
1534
			       struct iwl_scale_tbl_info *tbl)
J
Johannes Berg 已提交
1535
{
1536
	rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1537
	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
J
Johannes Berg 已提交
1538 1539
}

1540 1541 1542 1543 1544 1545
static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
			      struct ieee80211_sta *sta,
			      struct iwl_lq_sta *lq_sta,
			      struct iwl_scale_tbl_info *tbl,
			      enum rs_action scale_action)
{
1546
	if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584
		return false;

	if (!is_vht_siso(&tbl->rate))
		return false;

	if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
	    (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
	    (scale_action == RS_ACTION_DOWNSCALE)) {
		tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
		tbl->rate.index = IWL_RATE_MCS_4_INDEX;
		IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
		goto tweaked;
	}

	/* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
	 * sustainable, i.e. we're past the test window. We can't go back
	 * if MCS5 is just tested as this will happen always after switching
	 * to 20Mhz MCS4 because the rate stats are cleared.
	 */
	if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
	    (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
	     (scale_action == RS_ACTION_STAY)) ||
	     ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
	      (scale_action == RS_ACTION_UPSCALE)))) {
		tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
		tbl->rate.index = IWL_RATE_MCS_1_INDEX;
		IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
		goto tweaked;
	}

	return false;

tweaked:
	rs_set_expected_tpt_table(lq_sta, tbl);
	rs_rate_scale_clear_tbl_windows(mvm, tbl);
	return true;
}

1585 1586 1587 1588 1589
static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
					 struct iwl_lq_sta *lq_sta,
					 struct ieee80211_sta *sta,
					 struct iwl_scale_tbl_info *tbl)
{
1590
	int i, j, max_rate;
1591 1592 1593 1594
	enum rs_column next_col_id;
	const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
	const struct rs_tx_column *next_col;
	allow_column_func_t allow_func;
1595
	u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1596
	const u16 *expected_tpt_tbl;
1597
	u16 tpt, max_expected_tpt;
1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621

	for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
		next_col_id = curr_col->next_columns[i];

		if (next_col_id == RS_COLUMN_INVALID)
			continue;

		if (lq_sta->visited_columns & BIT(next_col_id)) {
			IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
				       next_col_id);
			continue;
		}

		next_col = &rs_tx_columns[next_col_id];

		if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
			IWL_DEBUG_RATE(mvm,
				       "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
				       next_col_id, valid_ants, next_col->ant);
			continue;
		}

		for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
			allow_func = next_col->checks[j];
1622 1623
			if (allow_func && !allow_func(mvm, sta, &tbl->rate,
						      next_col))
1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636
				break;
		}

		if (j != MAX_COLUMN_CHECKS) {
			IWL_DEBUG_RATE(mvm,
				       "Skip column %d: not allowed (check %d failed)\n",
				       next_col_id, j);

			continue;
		}

		tpt = lq_sta->last_tpt / 100;
		expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1637
						     rs_bw_from_sta_bw(sta));
1638 1639 1640
		if (WARN_ON_ONCE(!expected_tpt_tbl))
			continue;

1641
		max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1642 1643 1644 1645
		if (max_rate == IWL_RATE_INVALID) {
			IWL_DEBUG_RATE(mvm,
				       "Skip column %d: no rate is allowed in this column\n",
				       next_col_id);
1646
			continue;
1647
		}
1648

1649
		max_expected_tpt = expected_tpt_tbl[max_rate];
1650 1651 1652 1653 1654 1655 1656
		if (tpt >= max_expected_tpt) {
			IWL_DEBUG_RATE(mvm,
				       "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
				       next_col_id, max_expected_tpt, tpt);
			continue;
		}

1657 1658 1659
		IWL_DEBUG_RATE(mvm,
			       "Found potential column %d. Max expected %d current %d\n",
			       next_col_id, max_expected_tpt, tpt);
1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673
		break;
	}

	if (i == MAX_NEXT_COLUMNS)
		return RS_COLUMN_INVALID;

	return next_col_id;
}

static int rs_switch_to_column(struct iwl_mvm *mvm,
			       struct iwl_lq_sta *lq_sta,
			       struct ieee80211_sta *sta,
			       enum rs_column col_id)
{
1674
	struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
1675
	struct iwl_scale_tbl_info *search_tbl =
1676
		&lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
1677 1678 1679
	struct rs_rate *rate = &search_tbl->rate;
	const struct rs_tx_column *column = &rs_tx_columns[col_id];
	const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1680
	unsigned long rate_mask = 0;
1681 1682
	u32 rate_idx = 0;

1683
	memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1684 1685 1686 1687 1688

	rate->sgi = column->sgi;
	rate->ant = column->ant;

	if (column->mode == RS_LEGACY) {
1689
		if (lq_sta->band == NL80211_BAND_5GHZ)
1690 1691 1692 1693
			rate->type = LQ_LEGACY_A;
		else
			rate->type = LQ_LEGACY_G;

1694 1695
		rate->bw = RATE_MCS_CHAN_WIDTH_20;
		rate->ldpc = false;
1696 1697 1698 1699 1700 1701 1702 1703
		rate_mask = lq_sta->active_legacy_rate;
	} else if (column->mode == RS_SISO) {
		rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
		rate_mask = lq_sta->active_siso_rate;
	} else if (column->mode == RS_MIMO2) {
		rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
		rate_mask = lq_sta->active_mimo2_rate;
	} else {
1704
		WARN_ONCE(1, "Bad column mode");
1705 1706
	}

1707 1708 1709 1710 1711
	if (column->mode != RS_LEGACY) {
		rate->bw = rs_bw_from_sta_bw(sta);
		rate->ldpc = lq_sta->ldpc;
	}

1712 1713 1714
	search_tbl->column = col_id;
	rs_set_expected_tpt_table(lq_sta, search_tbl);

1715 1716
	lq_sta->visited_columns |= BIT(col_id);

1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727
	/* Get the best matching rate if we're changing modes. e.g.
	 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
	 */
	if (curr_column->mode != column->mode) {
		rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
					    rate_mask, rate->index);

		if ((rate_idx == IWL_RATE_INVALID) ||
		    !(BIT(rate_idx) & rate_mask)) {
			IWL_DEBUG_RATE(mvm,
				       "can not switch with index %d"
1728
				       " rate mask %lx\n",
1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746
				       rate_idx, rate_mask);

			goto err;
		}

		rate->index = rate_idx;
	}

	IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
		       col_id, rate->index);

	return 0;

err:
	rate->type = LQ_NONE;
	return -1;
}

1747 1748 1749 1750 1751 1752 1753 1754
static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
					 struct iwl_scale_tbl_info *tbl,
					 s32 sr, int low, int high,
					 int current_tpt,
					 int low_tpt, int high_tpt)
{
	enum rs_action action = RS_ACTION_STAY;

1755 1756
	if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
	    (current_tpt == 0)) {
1757
		IWL_DEBUG_RATE(mvm,
1758 1759
			       "Decrease rate because of low SR\n");
		return RS_ACTION_DOWNSCALE;
1760 1761
	}

1762 1763 1764
	if ((low_tpt == IWL_INVALID_VALUE) &&
	    (high_tpt == IWL_INVALID_VALUE) &&
	    (high != IWL_RATE_INVALID)) {
1765
		IWL_DEBUG_RATE(mvm,
1766 1767
			       "No data about high/low rates. Increase rate\n");
		return RS_ACTION_UPSCALE;
1768 1769
	}

1770 1771 1772 1773 1774 1775 1776 1777
	if ((high_tpt == IWL_INVALID_VALUE) &&
	    (high != IWL_RATE_INVALID) &&
	    (low_tpt != IWL_INVALID_VALUE) &&
	    (low_tpt < current_tpt)) {
		IWL_DEBUG_RATE(mvm,
			       "No data about high rate and low rate is worse. Increase rate\n");
		return RS_ACTION_UPSCALE;
	}
1778

1779 1780 1781 1782 1783
	if ((high_tpt != IWL_INVALID_VALUE) &&
	    (high_tpt > current_tpt)) {
		IWL_DEBUG_RATE(mvm,
			       "Higher rate is better. Increate rate\n");
		return RS_ACTION_UPSCALE;
1784 1785
	}

1786 1787 1788 1789
	if ((low_tpt != IWL_INVALID_VALUE) &&
	    (high_tpt != IWL_INVALID_VALUE) &&
	    (low_tpt < current_tpt) &&
	    (high_tpt < current_tpt)) {
1790
		IWL_DEBUG_RATE(mvm,
1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804
			       "Both high and low are worse. Maintain rate\n");
		return RS_ACTION_STAY;
	}

	if ((low_tpt != IWL_INVALID_VALUE) &&
	    (low_tpt > current_tpt)) {
		IWL_DEBUG_RATE(mvm,
			       "Lower rate is better\n");
		action = RS_ACTION_DOWNSCALE;
		goto out;
	}

	if ((low_tpt == IWL_INVALID_VALUE) &&
	    (low != IWL_RATE_INVALID)) {
1805
		IWL_DEBUG_RATE(mvm,
1806 1807 1808 1809 1810 1811 1812 1813 1814
			       "No data about lower rate\n");
		action = RS_ACTION_DOWNSCALE;
		goto out;
	}

	IWL_DEBUG_RATE(mvm, "Maintain rate\n");

out:
	if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1815
		if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1816 1817 1818 1819 1820 1821 1822 1823 1824 1825
			IWL_DEBUG_RATE(mvm,
				       "SR is above NO DECREASE. Avoid downscale\n");
			action = RS_ACTION_STAY;
		} else if (current_tpt > (100 * tbl->expected_tpt[low])) {
			IWL_DEBUG_RATE(mvm,
				       "Current TPT is higher than max expected in low rate. Avoid downscale\n");
			action = RS_ACTION_STAY;
		} else {
			IWL_DEBUG_RATE(mvm, "Decrease rate\n");
		}
1826 1827 1828 1829
	}

	return action;
}
1830

1831 1832 1833 1834 1835 1836
static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
			  struct iwl_lq_sta *lq_sta)
{
	/* Our chip supports Tx STBC and the peer is an HT/VHT STA which
	 * supports STBC of at least 1*SS
	 */
1837
	if (!lq_sta->stbc_capable)
1838 1839 1840 1841 1842 1843 1844 1845
		return false;

	if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
		return false;

	return true;
}

1846 1847 1848
static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
				int *weaker, int *stronger)
{
1849
	*weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1850 1851 1852
	if (*weaker > TPC_MAX_REDUCTION)
		*weaker = TPC_INVALID;

1853
	*stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1854 1855 1856 1857
	if (*stronger < 0)
		*stronger = TPC_INVALID;
}

1858
static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1859
			   struct rs_rate *rate, enum nl80211_band band)
1860 1861
{
	int index = rate->index;
1862 1863
	bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
	bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1864
				!vif->cfg.ps);
1865

1866 1867
	IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
		       cam, sta_ps_disabled);
1868 1869 1870 1871
	/*
	 * allow tpc only if power management is enabled, or bt coex
	 * activity grade allows it and we are on 2.4Ghz.
	 */
1872
	if ((cam || sta_ps_disabled) &&
1873 1874 1875 1876 1877 1878 1879 1880 1881
	    !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
		return false;

	IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
	if (is_legacy(rate))
		return index == IWL_RATE_54M_INDEX;
	if (is_ht(rate))
		return index == IWL_RATE_MCS_7_INDEX;
	if (is_vht(rate))
1882
		return index == IWL_RATE_MCS_9_INDEX;
1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906

	WARN_ON_ONCE(1);
	return false;
}

enum tpc_action {
	TPC_ACTION_STAY,
	TPC_ACTION_DECREASE,
	TPC_ACTION_INCREASE,
	TPC_ACTION_NO_RESTIRCTION,
};

static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
					 s32 sr, int weak, int strong,
					 int current_tpt,
					 int weak_tpt, int strong_tpt)
{
	/* stay until we have valid tpt */
	if (current_tpt == IWL_INVALID_VALUE) {
		IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
		return TPC_ACTION_STAY;
	}

	/* Too many failures, increase txp */
1907 1908
	if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
	    current_tpt == 0) {
1909 1910 1911 1912 1913
		IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
		return TPC_ACTION_NO_RESTIRCTION;
	}

	/* try decreasing first if applicable */
1914 1915
	if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
	    weak != TPC_INVALID) {
1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931
		if (weak_tpt == IWL_INVALID_VALUE &&
		    (strong_tpt == IWL_INVALID_VALUE ||
		     current_tpt >= strong_tpt)) {
			IWL_DEBUG_RATE(mvm,
				       "no weak txp measurement. decrease txp\n");
			return TPC_ACTION_DECREASE;
		}

		if (weak_tpt > current_tpt) {
			IWL_DEBUG_RATE(mvm,
				       "lower txp has better tpt. decrease txp\n");
			return TPC_ACTION_DECREASE;
		}
	}

	/* next, increase if needed */
1932 1933
	if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
	    strong != TPC_INVALID) {
1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
		if (weak_tpt == IWL_INVALID_VALUE &&
		    strong_tpt != IWL_INVALID_VALUE &&
		    current_tpt < strong_tpt) {
			IWL_DEBUG_RATE(mvm,
				       "higher txp has better tpt. increase txp\n");
			return TPC_ACTION_INCREASE;
		}

		if (weak_tpt < current_tpt &&
		    (strong_tpt == IWL_INVALID_VALUE ||
		     strong_tpt > current_tpt)) {
			IWL_DEBUG_RATE(mvm,
				       "lower txp has worse tpt. increase txp\n");
			return TPC_ACTION_INCREASE;
		}
	}

	IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
	return TPC_ACTION_STAY;
}

static bool rs_tpc_perform(struct iwl_mvm *mvm,
			   struct ieee80211_sta *sta,
			   struct iwl_lq_sta *lq_sta,
			   struct iwl_scale_tbl_info *tbl)
{
1960
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1961 1962
	struct ieee80211_vif *vif = mvm_sta->vif;
	struct ieee80211_chanctx_conf *chanctx_conf;
1963
	enum nl80211_band band;
1964 1965 1966 1967 1968 1969 1970 1971 1972
	struct iwl_rate_scale_data *window;
	struct rs_rate *rate = &tbl->rate;
	enum tpc_action action;
	s32 sr;
	u8 cur = lq_sta->lq.reduced_tpc;
	int current_tpt;
	int weak, strong;
	int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;

1973
#ifdef CONFIG_MAC80211_DEBUGFS
1974
	if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1975
		IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1976 1977 1978
			       lq_sta->pers.dbg_fixed_txp_reduction);
		lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
		return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1979 1980 1981
	}
#endif

1982
	rcu_read_lock();
1983
	chanctx_conf = rcu_dereference(vif->bss_conf.chanctx_conf);
1984
	if (WARN_ON(!chanctx_conf))
1985
		band = NUM_NL80211_BANDS;
1986 1987 1988 1989
	else
		band = chanctx_conf->def.chan->band;
	rcu_read_unlock();

1990
	if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1991
		IWL_DEBUG_RATE(mvm,
1992
			       "tpc is not allowed. remove txp restrictions\n");
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
		lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
		return cur != TPC_NO_REDUCTION;
	}

	rs_get_adjacent_txp(mvm, cur, &weak, &strong);

	/* Collect measured throughputs for current and adjacent rates */
	window = tbl->tpc_win;
	sr = window[cur].success_ratio;
	current_tpt = window[cur].average_tpt;
	if (weak != TPC_INVALID)
		weak_tpt = window[weak].average_tpt;
	if (strong != TPC_INVALID)
		strong_tpt = window[strong].average_tpt;

	IWL_DEBUG_RATE(mvm,
		       "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
		       cur, current_tpt, sr, weak, strong,
		       weak_tpt, strong_tpt);

	action = rs_get_tpc_action(mvm, sr, weak, strong,
				   current_tpt, weak_tpt, strong_tpt);

	/* override actions if we are on the edge */
	if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2018
		IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2019 2020 2021 2022
		action = TPC_ACTION_STAY;
	} else if (strong == TPC_INVALID &&
		   (action == TPC_ACTION_INCREASE ||
		    action == TPC_ACTION_NO_RESTIRCTION)) {
2023
		IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043
		action = TPC_ACTION_STAY;
	}

	switch (action) {
	case TPC_ACTION_DECREASE:
		lq_sta->lq.reduced_tpc = weak;
		return true;
	case TPC_ACTION_INCREASE:
		lq_sta->lq.reduced_tpc = strong;
		return true;
	case TPC_ACTION_NO_RESTIRCTION:
		lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
		return true;
	case TPC_ACTION_STAY:
		/* do nothing */
		break;
	}
	return false;
}

J
Johannes Berg 已提交
2044 2045 2046 2047 2048
/*
 * Do rate scaling and search for new modulation mode.
 */
static void rs_rate_scale_perform(struct iwl_mvm *mvm,
				  struct ieee80211_sta *sta,
2049
				  struct iwl_lq_sta *lq_sta,
2050
				  int tid, bool ndp)
J
Johannes Berg 已提交
2051 2052 2053 2054 2055 2056 2057 2058 2059
{
	int low = IWL_RATE_INVALID;
	int high = IWL_RATE_INVALID;
	int index;
	struct iwl_rate_scale_data *window = NULL;
	int current_tpt = IWL_INVALID_VALUE;
	int low_tpt = IWL_INVALID_VALUE;
	int high_tpt = IWL_INVALID_VALUE;
	u32 fail_count;
2060
	enum rs_action scale_action = RS_ACTION_STAY;
J
Johannes Berg 已提交
2061 2062 2063 2064 2065 2066 2067
	u16 rate_mask;
	u8 update_lq = 0;
	struct iwl_scale_tbl_info *tbl, *tbl1;
	u8 active_tbl = 0;
	u8 done_search = 0;
	u16 high_low;
	s32 sr;
2068
	u8 prev_agg = lq_sta->is_agg;
2069
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2070
	struct rs_rate *rate;
J
Johannes Berg 已提交
2071

2072
	lq_sta->is_agg = !!mvmsta->agg_tids;
J
Johannes Berg 已提交
2073 2074 2075 2076 2077 2078 2079 2080 2081

	/*
	 * Select rate-scale / modulation-mode table to work with in
	 * the rest of this function:  "search" if searching for better
	 * modulation mode, or "active" if doing rate scaling within a mode.
	 */
	if (!lq_sta->search_better_tbl)
		active_tbl = lq_sta->active_tbl;
	else
2082
		active_tbl = rs_search_tbl(lq_sta->active_tbl);
J
Johannes Berg 已提交
2083 2084

	tbl = &(lq_sta->lq_info[active_tbl]);
2085
	rate = &tbl->rate;
J
Johannes Berg 已提交
2086

2087 2088 2089 2090 2091
	if (prev_agg != lq_sta->is_agg) {
		IWL_DEBUG_RATE(mvm,
			       "Aggregation changed: prev %d current %d. Update expected TPT table\n",
			       prev_agg, lq_sta->is_agg);
		rs_set_expected_tpt_table(lq_sta, tbl);
2092
		rs_rate_scale_clear_tbl_windows(mvm, tbl);
2093 2094
	}

J
Johannes Berg 已提交
2095
	/* current tx rate */
2096
	index = rate->index;
J
Johannes Berg 已提交
2097 2098

	/* rates available for this association, and for modulation mode */
2099
	rate_mask = rs_get_supported_rates(lq_sta, rate);
J
Johannes Berg 已提交
2100

2101
	if (!(BIT(index) & rate_mask)) {
J
Johannes Berg 已提交
2102 2103 2104
		IWL_ERR(mvm, "Current Rate is not valid\n");
		if (lq_sta->search_better_tbl) {
			/* revert to active table if search table is not valid*/
2105
			rate->type = LQ_NONE;
J
Johannes Berg 已提交
2106 2107
			lq_sta->search_better_tbl = 0;
			tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2108
			rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
J
Johannes Berg 已提交
2109 2110 2111 2112 2113 2114 2115 2116 2117 2118
		}
		return;
	}

	/* Get expected throughput table and history window for current rate */
	if (!tbl->expected_tpt) {
		IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
		return;
	}

2119
	/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
J
Johannes Berg 已提交
2120 2121 2122 2123 2124 2125 2126 2127 2128 2129
	window = &(tbl->win[index]);

	/*
	 * If there is not enough history to calculate actual average
	 * throughput, keep analyzing results of more tx frames, without
	 * changing rate or mode (bypass most of the rest of this function).
	 * Set up new rate table in uCode only if old rate is not supported
	 * in current association (use new rate found above).
	 */
	fail_count = window->counter - window->success_counter;
2130 2131
	if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
	    (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
J
Johannes Berg 已提交
2132
		IWL_DEBUG_RATE(mvm,
2133 2134 2135
			       "%s: Test Window: succ %d total %d\n",
			       rs_pretty_rate(rate),
			       window->success_counter, window->counter);
J
Johannes Berg 已提交
2136 2137 2138 2139 2140 2141 2142 2143

		/* Can't calculate this yet; not enough history */
		window->average_tpt = IWL_INVALID_VALUE;

		/* Should we stay with this modulation mode,
		 * or search for a new one? */
		rs_stay_in_table(lq_sta, false);

2144
		return;
J
Johannes Berg 已提交
2145 2146 2147 2148 2149 2150 2151 2152 2153
	}

	/* If we are searching for better modulation mode, check success. */
	if (lq_sta->search_better_tbl) {
		/* If good success, continue using the "search" mode;
		 * no need to send new link quality command, since we're
		 * continuing to use the setup that we've been trying. */
		if (window->average_tpt > lq_sta->last_tpt) {
			IWL_DEBUG_RATE(mvm,
2154 2155
				       "SWITCHING TO NEW TABLE SR: %d "
				       "cur-tpt %d old-tpt %d\n",
J
Johannes Berg 已提交
2156 2157 2158 2159 2160 2161 2162 2163 2164 2165
				       window->success_ratio,
				       window->average_tpt,
				       lq_sta->last_tpt);

			/* Swap tables; "search" becomes "active" */
			lq_sta->active_tbl = active_tbl;
			current_tpt = window->average_tpt;
		/* Else poor success; go back to mode in "active" table */
		} else {
			IWL_DEBUG_RATE(mvm,
2166 2167
				       "GOING BACK TO THE OLD TABLE: SR %d "
				       "cur-tpt %d old-tpt %d\n",
J
Johannes Berg 已提交
2168 2169 2170 2171 2172
				       window->success_ratio,
				       window->average_tpt,
				       lq_sta->last_tpt);

			/* Nullify "search" table */
2173
			rate->type = LQ_NONE;
J
Johannes Berg 已提交
2174 2175 2176 2177 2178 2179

			/* Revert to "active" table */
			active_tbl = lq_sta->active_tbl;
			tbl = &(lq_sta->lq_info[active_tbl]);

			/* Revert to "active" rate and throughput info */
2180
			index = tbl->rate.index;
J
Johannes Berg 已提交
2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
			current_tpt = lq_sta->last_tpt;

			/* Need to set up a new rate table in uCode */
			update_lq = 1;
		}

		/* Either way, we've made a decision; modulation mode
		 * search is done, allow rate adjustment next time. */
		lq_sta->search_better_tbl = 0;
		done_search = 1;	/* Don't switch modes below! */
		goto lq_update;
	}

	/* (Else) not in search of better modulation mode, try for better
	 * starting rate, while staying in this mode. */
2196
	high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
J
Johannes Berg 已提交
2197 2198 2199
	low = high_low & 0xff;
	high = (high_low >> 8) & 0xff;

2200
	/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
J
Johannes Berg 已提交
2201 2202 2203 2204 2205 2206 2207 2208 2209 2210

	sr = window->success_ratio;

	/* Collect measured throughputs for current and adjacent rates */
	current_tpt = window->average_tpt;
	if (low != IWL_RATE_INVALID)
		low_tpt = tbl->win[low].average_tpt;
	if (high != IWL_RATE_INVALID)
		high_tpt = tbl->win[high].average_tpt;

2211
	IWL_DEBUG_RATE(mvm,
2212 2213
		       "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
		       rs_pretty_rate(rate), current_tpt, sr,
2214
		       low, high, low_tpt, high_tpt);
2215

2216 2217
	scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
					  current_tpt, low_tpt, high_tpt);
J
Johannes Berg 已提交
2218

2219
	/* Force a search in case BT doesn't like us being in MIMO */
2220
	if (is_mimo(rate) &&
2221
	    !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2222 2223
		IWL_DEBUG_RATE(mvm,
			       "BT Coex forbids MIMO. Search for new config\n");
2224 2225 2226 2227
		rs_stay_in_table(lq_sta, true);
		goto lq_update;
	}

J
Johannes Berg 已提交
2228
	switch (scale_action) {
2229
	case RS_ACTION_DOWNSCALE:
J
Johannes Berg 已提交
2230 2231 2232 2233
		/* Decrease starting rate, update uCode's rate table */
		if (low != IWL_RATE_INVALID) {
			update_lq = 1;
			index = low;
2234 2235 2236
		} else {
			IWL_DEBUG_RATE(mvm,
				       "At the bottom rate. Can't decrease\n");
J
Johannes Berg 已提交
2237 2238 2239
		}

		break;
2240
	case RS_ACTION_UPSCALE:
J
Johannes Berg 已提交
2241 2242 2243 2244
		/* Increase starting rate, update uCode's rate table */
		if (high != IWL_RATE_INVALID) {
			update_lq = 1;
			index = high;
2245 2246 2247
		} else {
			IWL_DEBUG_RATE(mvm,
				       "At the top rate. Can't increase\n");
J
Johannes Berg 已提交
2248 2249 2250
		}

		break;
2251
	case RS_ACTION_STAY:
J
Johannes Berg 已提交
2252
		/* No change */
2253 2254
		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
			update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2255
		break;
J
Johannes Berg 已提交
2256 2257 2258 2259 2260 2261
	default:
		break;
	}

lq_update:
	/* Replace uCode's rate table for the destination station. */
2262 2263
	if (update_lq) {
		tbl->rate.index = index;
2264 2265
		if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
			rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2266
		rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2267
		rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2268
	}
J
Johannes Berg 已提交
2269 2270 2271 2272 2273 2274 2275 2276 2277 2278

	rs_stay_in_table(lq_sta, false);

	/*
	 * Search for new modulation mode if we're:
	 * 1)  Not changing rates right now
	 * 2)  Not just finishing up a search
	 * 3)  Allowing a new search
	 */
	if (!update_lq && !done_search &&
2279 2280 2281 2282
	    lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
	    && window->counter) {
		enum rs_column next_column;

J
Johannes Berg 已提交
2283 2284 2285
		/* Save current throughput to compare with "search" throughput*/
		lq_sta->last_tpt = current_tpt;

2286
		IWL_DEBUG_RATE(mvm,
2287 2288
			       "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
			       update_lq, done_search, lq_sta->rs_state,
2289
			       window->counter);
2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301

		next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
		if (next_column != RS_COLUMN_INVALID) {
			int ret = rs_switch_to_column(mvm, lq_sta, sta,
						      next_column);
			if (!ret)
				lq_sta->search_better_tbl = 1;
		} else {
			IWL_DEBUG_RATE(mvm,
				       "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
			lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
		}
J
Johannes Berg 已提交
2302 2303 2304 2305

		/* If new "search" mode was selected, set up in uCode table */
		if (lq_sta->search_better_tbl) {
			/* Access the "search" table, clear its history. */
2306
			tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
2307
			rs_rate_scale_clear_tbl_windows(mvm, tbl);
J
Johannes Berg 已提交
2308 2309

			/* Use new "search" start rate */
2310
			index = tbl->rate.index;
J
Johannes Berg 已提交
2311

2312 2313
			rs_dump_rate(mvm, &tbl->rate,
				     "Switch to SEARCH TABLE:");
2314
			rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
J
Johannes Berg 已提交
2315 2316 2317 2318 2319
		} else {
			done_search = 1;
		}
	}

2320 2321 2322
	if (!ndp)
		rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);

2323
	if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
J
Johannes Berg 已提交
2324
		tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2325
		rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
J
Johannes Berg 已提交
2326 2327 2328
	}
}

2329 2330 2331 2332 2333
struct rs_init_rate_info {
	s8 rssi;
	u8 rate_idx;
};

2334
static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346
	{ -60, IWL_RATE_54M_INDEX },
	{ -64, IWL_RATE_48M_INDEX },
	{ -68, IWL_RATE_36M_INDEX },
	{ -80, IWL_RATE_24M_INDEX },
	{ -84, IWL_RATE_18M_INDEX },
	{ -85, IWL_RATE_12M_INDEX },
	{ -86, IWL_RATE_11M_INDEX },
	{ -88, IWL_RATE_5M_INDEX  },
	{ -90, IWL_RATE_2M_INDEX  },
	{ S8_MIN, IWL_RATE_1M_INDEX },
};

2347
static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2348 2349 2350 2351 2352 2353 2354 2355 2356 2357
	{ -60, IWL_RATE_54M_INDEX },
	{ -64, IWL_RATE_48M_INDEX },
	{ -72, IWL_RATE_36M_INDEX },
	{ -80, IWL_RATE_24M_INDEX },
	{ -84, IWL_RATE_18M_INDEX },
	{ -85, IWL_RATE_12M_INDEX },
	{ -87, IWL_RATE_9M_INDEX  },
	{ S8_MIN, IWL_RATE_6M_INDEX },
};

2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368
static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
	{ -60, IWL_RATE_MCS_7_INDEX },
	{ -64, IWL_RATE_MCS_6_INDEX },
	{ -68, IWL_RATE_MCS_5_INDEX },
	{ -72, IWL_RATE_MCS_4_INDEX },
	{ -80, IWL_RATE_MCS_3_INDEX },
	{ -84, IWL_RATE_MCS_2_INDEX },
	{ -85, IWL_RATE_MCS_1_INDEX },
	{ S8_MIN, IWL_RATE_MCS_0_INDEX},
};

2369 2370 2371
/* MCS index 9 is not valid for 20MHz VHT channel width,
 * but is ok for 40, 80 and 160MHz channels.
 */
2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383
static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
	{ -60, IWL_RATE_MCS_8_INDEX },
	{ -64, IWL_RATE_MCS_7_INDEX },
	{ -68, IWL_RATE_MCS_6_INDEX },
	{ -72, IWL_RATE_MCS_5_INDEX },
	{ -80, IWL_RATE_MCS_4_INDEX },
	{ -84, IWL_RATE_MCS_3_INDEX },
	{ -85, IWL_RATE_MCS_2_INDEX },
	{ -87, IWL_RATE_MCS_1_INDEX },
	{ S8_MIN, IWL_RATE_MCS_0_INDEX},
};

2384
static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396
	{ -60, IWL_RATE_MCS_9_INDEX },
	{ -64, IWL_RATE_MCS_8_INDEX },
	{ -68, IWL_RATE_MCS_7_INDEX },
	{ -72, IWL_RATE_MCS_6_INDEX },
	{ -80, IWL_RATE_MCS_5_INDEX },
	{ -84, IWL_RATE_MCS_4_INDEX },
	{ -85, IWL_RATE_MCS_3_INDEX },
	{ -87, IWL_RATE_MCS_2_INDEX },
	{ -88, IWL_RATE_MCS_1_INDEX },
	{ S8_MIN, IWL_RATE_MCS_0_INDEX },
};

2397 2398
#define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */

2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412
/* Init the optimal rate based on STA caps
 * This combined with rssi is used to report the last tx rate
 * to userspace when we haven't transmitted enough frames.
 */
static void rs_init_optimal_rate(struct iwl_mvm *mvm,
				 struct ieee80211_sta *sta,
				 struct iwl_lq_sta *lq_sta)
{
	struct rs_rate *rate = &lq_sta->optimal_rate;

	if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
		rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
	else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
		rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2413
	else if (lq_sta->band == NL80211_BAND_5GHZ)
2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429
		rate->type = LQ_LEGACY_A;
	else
		rate->type = LQ_LEGACY_G;

	rate->bw = rs_bw_from_sta_bw(sta);
	rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);

	/* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */

	if (is_mimo(rate)) {
		lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
	} else if (is_siso(rate)) {
		lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
	} else {
		lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;

2430
		if (lq_sta->band == NL80211_BAND_5GHZ) {
2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446
			lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
			lq_sta->optimal_nentries =
				ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
		} else {
			lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
			lq_sta->optimal_nentries =
				ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
		}
	}

	if (is_vht(rate)) {
		if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
			lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
			lq_sta->optimal_nentries =
				ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
		} else {
2447
			lq_sta->optimal_rates = rs_optimal_rates_vht;
2448
			lq_sta->optimal_nentries =
2449
				ARRAY_SIZE(rs_optimal_rates_vht);
2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479
		}
	} else if (is_ht(rate)) {
		lq_sta->optimal_rates = rs_optimal_rates_ht;
		lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
	}
}

/* Compute the optimal rate index based on RSSI */
static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
					   struct iwl_lq_sta *lq_sta)
{
	struct rs_rate *rate = &lq_sta->optimal_rate;
	int i;

	rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
				     BITS_PER_LONG);

	for (i = 0; i < lq_sta->optimal_nentries; i++) {
		int rate_idx = lq_sta->optimal_rates[i].rate_idx;

		if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
		    (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
			rate->index = rate_idx;
			break;
		}
	}

	return rate;
}

2480 2481 2482 2483
/* Choose an initial legacy rate and antenna to use based on the RSSI
 * of last Rx
 */
static void rs_get_initial_rate(struct iwl_mvm *mvm,
2484
				struct ieee80211_sta *sta,
2485
				struct iwl_lq_sta *lq_sta,
2486
				enum nl80211_band band,
2487
				struct rs_rate *rate)
2488
{
2489
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2490
	int i, nentries;
2491
	unsigned long active_rate;
2492 2493
	s8 best_rssi = S8_MIN;
	u8 best_ant = ANT_NONE;
2494
	u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507
	const struct rs_init_rate_info *initial_rates;

	for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
		if (!(lq_sta->pers.chains & BIT(i)))
			continue;

		if (lq_sta->pers.chain_signal[i] > best_rssi) {
			best_rssi = lq_sta->pers.chain_signal[i];
			best_ant = BIT(i);
		}
	}

	IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2508
		       iwl_rs_pretty_ant(best_ant), best_rssi);
2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521

	if (best_ant != ANT_A && best_ant != ANT_B)
		rate->ant = first_antenna(valid_tx_ant);
	else
		rate->ant = best_ant;

	rate->sgi = false;
	rate->ldpc = false;
	rate->bw = RATE_MCS_CHAN_WIDTH_20;

	rate->index = find_first_bit(&lq_sta->active_legacy_rate,
				     BITS_PER_LONG);

2522
	if (band == NL80211_BAND_5GHZ) {
2523
		rate->type = LQ_LEGACY_A;
2524 2525
		initial_rates = rs_optimal_rates_5ghz_legacy;
		nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2526 2527
	} else {
		rate->type = LQ_LEGACY_G;
2528 2529
		initial_rates = rs_optimal_rates_24ghz_legacy;
		nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2530 2531
	}

2532 2533 2534 2535 2536 2537 2538 2539
	if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
		goto out;

	/* Start from a higher rate if the corresponding debug capability
	 * is enabled. The rate is chosen according to AP capabilities.
	 * In case of VHT/HT when the rssi is low fallback to the case of
	 * legacy rates.
	 */
2540
	if (sta->deflink.vht_cap.vht_supported &&
2541
	    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2542 2543 2544 2545 2546 2547 2548 2549 2550
		/*
		 * In AP mode, when a new station associates, rs is initialized
		 * immediately upon association completion, before the phy
		 * context is updated with the association parameters, so the
		 * sta bandwidth might be wider than the phy context allows.
		 * To avoid this issue, always initialize rs with 20mhz
		 * bandwidth rate, and after authorization, when the phy context
		 * is already up-to-date, re-init rs with the correct bw.
		 */
2551 2552
		u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
				RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2553 2554 2555 2556 2557

		switch (bw) {
		case RATE_MCS_CHAN_WIDTH_40:
		case RATE_MCS_CHAN_WIDTH_80:
		case RATE_MCS_CHAN_WIDTH_160:
2558 2559 2560
			initial_rates = rs_optimal_rates_vht;
			nentries = ARRAY_SIZE(rs_optimal_rates_vht);
			break;
2561
		case RATE_MCS_CHAN_WIDTH_20:
2562 2563
			initial_rates = rs_optimal_rates_vht_20mhz;
			nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2564 2565
			break;
		default:
2566 2567
			IWL_ERR(mvm, "Invalid BW %d\n",
				sta->deflink.bandwidth);
2568
			goto out;
2569
		}
2570

2571 2572
		active_rate = lq_sta->active_siso_rate;
		rate->type = LQ_VHT_SISO;
2573
		rate->bw = bw;
2574
	} else if (sta->deflink.ht_cap.ht_supported &&
2575 2576 2577 2578 2579 2580 2581
		   best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
		initial_rates = rs_optimal_rates_ht;
		nentries = ARRAY_SIZE(rs_optimal_rates_ht);
		active_rate = lq_sta->active_siso_rate;
		rate->type = LQ_HT_SISO;
	} else {
		active_rate = lq_sta->active_legacy_rate;
2582 2583
	}

2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595
	for (i = 0; i < nentries; i++) {
		int rate_idx = initial_rates[i].rate_idx;

		if ((best_rssi >= initial_rates[i].rssi) &&
		    (BIT(rate_idx) & active_rate)) {
			rate->index = rate_idx;
			break;
		}
	}

out:
	rs_dump_rate(mvm, rate, "INITIAL");
2596 2597 2598 2599
}

/* Save info about RSSI of last Rx */
void rs_update_last_rssi(struct iwl_mvm *mvm,
2600
			 struct iwl_mvm_sta *mvmsta,
2601 2602
			 struct ieee80211_rx_status *rx_status)
{
2603
	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2604 2605
	int i;

2606 2607 2608
	lq_sta->pers.chains = rx_status->chains;
	lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
	lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2609 2610 2611 2612 2613 2614 2615 2616 2617
	lq_sta->pers.last_rssi = S8_MIN;

	for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
		if (!(lq_sta->pers.chains & BIT(i)))
			continue;

		if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
			lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
	}
2618 2619
}

2620
/*
J
Johannes Berg 已提交
2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636
 * rs_initialize_lq - Initialize a station's hardware rate table
 *
 * The uCode's station table contains a table of fallback rates
 * for automatic fallback during transmission.
 *
 * NOTE: This sets up a default set of values.  These will be replaced later
 *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
 *       rc80211_simple.
 *
 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
 *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
 *       which requires station table entry to exist).
 */
static void rs_initialize_lq(struct iwl_mvm *mvm,
			     struct ieee80211_sta *sta,
			     struct iwl_lq_sta *lq_sta,
2637
			     enum nl80211_band band)
J
Johannes Berg 已提交
2638 2639
{
	struct iwl_scale_tbl_info *tbl;
2640
	struct rs_rate *rate;
J
Johannes Berg 已提交
2641 2642 2643 2644 2645 2646 2647 2648
	u8 active_tbl = 0;

	if (!sta || !lq_sta)
		return;

	if (!lq_sta->search_better_tbl)
		active_tbl = lq_sta->active_tbl;
	else
2649
		active_tbl = rs_search_tbl(lq_sta->active_tbl);
J
Johannes Berg 已提交
2650 2651

	tbl = &(lq_sta->lq_info[active_tbl]);
2652
	rate = &tbl->rate;
J
Johannes Berg 已提交
2653

2654
	rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2655
	rs_init_optimal_rate(mvm, sta, lq_sta);
J
Johannes Berg 已提交
2656

2657 2658 2659 2660 2661
	WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
		  "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
		  rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
		  mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);

2662
	tbl->column = rs_get_column_from_rate(rate);
2663

J
Johannes Berg 已提交
2664
	rs_set_expected_tpt_table(lq_sta, tbl);
2665
	rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
J
Johannes Berg 已提交
2666
	/* TODO restore station should remember the lq cmd */
2667
	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
J
Johannes Berg 已提交
2668 2669
}

2670 2671 2672
static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
			    void *mvm_sta,
			    struct ieee80211_tx_rate_control *txrc)
J
Johannes Berg 已提交
2673
{
2674
	struct iwl_op_mode *op_mode = mvm_r;
J
Johannes Berg 已提交
2675
	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2676
	struct sk_buff *skb = txrc->skb;
J
Johannes Berg 已提交
2677
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2678
	struct iwl_lq_sta *lq_sta;
2679 2680
	struct rs_rate *optimal_rate;
	u32 last_ucode_rate;
J
Johannes Berg 已提交
2681

2682 2683 2684 2685 2686 2687 2688 2689
	if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
		/* if vif isn't initialized mvm doesn't know about
		 * this station, so don't do anything with the it
		 */
		sta = NULL;
		mvm_sta = NULL;
	}

2690 2691 2692 2693
	if (!mvm_sta)
		return;

	lq_sta = mvm_sta;
2694 2695
	iwl_mvm_hwrate_to_tx_rate_v1(lq_sta->last_rate_n_flags,
				     info->band, &info->control.rates[0]);
2696
	info->control.rates[0].count = 1;
2697 2698 2699 2700 2701 2702 2703 2704

	/* Report the optimal rate based on rssi and STA caps if we haven't
	 * converged yet (too little traffic) or exploring other modulations
	 */
	if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
		optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
		last_ucode_rate = ucode_rate_from_rs_rate(mvm,
							  optimal_rate);
2705 2706
		iwl_mvm_hwrate_to_tx_rate_v1(last_ucode_rate, info->band,
					     &txrc->reported_rate);
2707
	}
J
Johannes Berg 已提交
2708 2709
}

2710 2711
static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
			      gfp_t gfp)
J
Johannes Berg 已提交
2712
{
2713
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2714 2715
	struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
	struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2716
	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
J
Johannes Berg 已提交
2717 2718 2719

	IWL_DEBUG_RATE(mvm, "create station rate scale window\n");

2720 2721 2722 2723
	lq_sta->pers.drv = mvm;
#ifdef CONFIG_MAC80211_DEBUGFS
	lq_sta->pers.dbg_fixed_rate = 0;
	lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2724
	lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2725
#endif
2726 2727
	lq_sta->pers.chains = 0;
	memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2728
	lq_sta->pers.last_rssi = S8_MIN;
2729

2730
	return lq_sta;
J
Johannes Berg 已提交
2731 2732
}

E
Eyal Shapira 已提交
2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750
static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
				       int nss)
{
	u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
		(0x3 << (2 * (nss - 1)));
	rx_mcs >>= (2 * (nss - 1));

	if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
		return IWL_RATE_MCS_7_INDEX;
	else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
		return IWL_RATE_MCS_8_INDEX;
	else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
		return IWL_RATE_MCS_9_INDEX;

	WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
	return -1;
}

2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762
static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
				     struct ieee80211_sta_vht_cap *vht_cap,
				     struct iwl_lq_sta *lq_sta)
{
	int i;
	int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);

	if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
		for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
			if (i == IWL_RATE_9M_INDEX)
				continue;

2763 2764
			/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
			if (i == IWL_RATE_MCS_9_INDEX &&
2765
			    sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2766 2767
				continue;

2768 2769 2770 2771
			lq_sta->active_siso_rate |= BIT(i);
		}
	}

2772
	if (sta->deflink.rx_nss < 2)
2773 2774
		return;

2775 2776 2777 2778 2779 2780
	highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
	if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
		for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
			if (i == IWL_RATE_9M_INDEX)
				continue;

2781 2782
			/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
			if (i == IWL_RATE_MCS_9_INDEX &&
2783
			    sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2784 2785
				continue;

2786 2787 2788 2789 2790
			lq_sta->active_mimo2_rate |= BIT(i);
		}
	}
}

2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816
static void rs_ht_init(struct iwl_mvm *mvm,
		       struct ieee80211_sta *sta,
		       struct iwl_lq_sta *lq_sta,
		       struct ieee80211_sta_ht_cap *ht_cap)
{
	/* active_siso_rate mask includes 9 MBits (bit 5),
	 * and CCK (bits 0-3), supp_rates[] does not;
	 * shift to convert format, force 9 MBits off.
	 */
	lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
	lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
	lq_sta->active_siso_rate &= ~((u16)0x2);
	lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;

	lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
	lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
	lq_sta->active_mimo2_rate &= ~((u16)0x2);
	lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;

	if (mvm->cfg->ht_params->ldpc &&
	    (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
		lq_sta->ldpc = true;

	if (mvm->cfg->ht_params->stbc &&
	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
	    (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2817
		lq_sta->stbc_capable = true;
2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835

	lq_sta->is_vht = false;
}

static void rs_vht_init(struct iwl_mvm *mvm,
			struct ieee80211_sta *sta,
			struct iwl_lq_sta *lq_sta,
			struct ieee80211_sta_vht_cap *vht_cap)
{
	rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);

	if (mvm->cfg->ht_params->ldpc &&
	    (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
		lq_sta->ldpc = true;

	if (mvm->cfg->ht_params->stbc &&
	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
	    (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2836 2837
		lq_sta->stbc_capable = true;

2838
	if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2839 2840 2841
	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
	    (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
		lq_sta->bfer_capable = true;
2842 2843 2844 2845

	lq_sta->is_vht = true;
}

2846
#ifdef CONFIG_IWLWIFI_DEBUGFS
2847
void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2848 2849
{
	spin_lock_bh(&mvm->drv_stats_lock);
2850
	memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2851 2852 2853
	spin_unlock_bh(&mvm->drv_stats_lock);
}

2854
void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2855
{
2856
	u8 nss = 0;
2857 2858 2859 2860

	spin_lock(&mvm->drv_stats_lock);

	if (agg)
2861
		mvm->drv_rx_stats.agg_frames++;
2862

2863
	mvm->drv_rx_stats.success_frames++;
2864

2865
	switch (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) {
2866
	case RATE_MCS_CHAN_WIDTH_20:
2867
		mvm->drv_rx_stats.bw_20_frames++;
2868 2869
		break;
	case RATE_MCS_CHAN_WIDTH_40:
2870
		mvm->drv_rx_stats.bw_40_frames++;
2871 2872
		break;
	case RATE_MCS_CHAN_WIDTH_80:
2873
		mvm->drv_rx_stats.bw_80_frames++;
2874
		break;
2875 2876 2877
	case RATE_MCS_CHAN_WIDTH_160:
		mvm->drv_rx_stats.bw_160_frames++;
		break;
2878 2879 2880 2881
	default:
		WARN_ONCE(1, "bad BW. rate 0x%x", rate);
	}

2882
	if (rate & RATE_MCS_HT_MSK_V1) {
2883
		mvm->drv_rx_stats.ht_frames++;
2884 2885
		nss = ((rate & RATE_HT_MCS_NSS_MSK_V1) >> RATE_HT_MCS_NSS_POS_V1) + 1;
	} else if (rate & RATE_MCS_VHT_MSK_V1) {
2886
		mvm->drv_rx_stats.vht_frames++;
2887 2888 2889
		nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
		       RATE_VHT_MCS_NSS_POS) + 1;
	} else {
2890
		mvm->drv_rx_stats.legacy_frames++;
2891 2892 2893
	}

	if (nss == 1)
2894
		mvm->drv_rx_stats.siso_frames++;
2895
	else if (nss == 2)
2896
		mvm->drv_rx_stats.mimo2_frames++;
2897

2898
	if (rate & RATE_MCS_SGI_MSK_V1)
2899
		mvm->drv_rx_stats.sgi_frames++;
2900
	else
2901
		mvm->drv_rx_stats.ngi_frames++;
2902

2903 2904 2905 2906
	mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
	mvm->drv_rx_stats.last_frame_idx =
		(mvm->drv_rx_stats.last_frame_idx + 1) %
			ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2907 2908 2909 2910 2911

	spin_unlock(&mvm->drv_stats_lock);
}
#endif

J
Johannes Berg 已提交
2912 2913 2914
/*
 * Called after adding a new station to initialize rate scaling
 */
2915
static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2916
			     enum nl80211_band band)
J
Johannes Berg 已提交
2917 2918 2919
{
	int i, j;
	struct ieee80211_hw *hw = mvm->hw;
2920 2921
	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
	struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
2922
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2923
	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
J
Johannes Berg 已提交
2924 2925 2926
	struct ieee80211_supported_band *sband;
	unsigned long supp; /* must be unsigned long for for_each_set_bit */

2927 2928
	lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock);

2929 2930
	/* clear all non-persistent lq data */
	memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2931

J
Johannes Berg 已提交
2932 2933
	sband = hw->wiphy->bands[band];

2934
	lq_sta->lq.sta_id = mvmsta->sta_id;
2935 2936
	mvmsta->amsdu_enabled = 0;
	mvmsta->max_amsdu_len = sta->max_amsdu_len;
J
Johannes Berg 已提交
2937 2938

	for (j = 0; j < LQ_SIZE; j++)
2939
		rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
J
Johannes Berg 已提交
2940 2941

	lq_sta->flush_timer = 0;
2942
	lq_sta->last_tx = jiffies;
J
Johannes Berg 已提交
2943 2944 2945

	IWL_DEBUG_RATE(mvm,
		       "LQ: *** rate scale station global init for station %d ***\n",
2946
		       mvmsta->sta_id);
J
Johannes Berg 已提交
2947 2948 2949 2950 2951
	/* TODO: what is a good starting rate for STA? About middle? Maybe not
	 * the lowest or the highest rate.. Could consider using RSSI from
	 * previous packets? Need to have IEEE 802.1X auth succeed immediately
	 * after assoc.. */

2952
	lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
J
Johannes Berg 已提交
2953 2954 2955 2956
	lq_sta->band = sband->band;
	/*
	 * active legacy rates as per supported rates bitmap
	 */
2957
	supp = sta->deflink.supp_rates[sband->band];
J
Johannes Berg 已提交
2958 2959 2960 2961
	lq_sta->active_legacy_rate = 0;
	for_each_set_bit(i, &supp, BITS_PER_LONG)
		lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);

E
Eyal Shapira 已提交
2962
	/* TODO: should probably account for rx_highest for both HT/VHT */
2963 2964 2965 2966
	if (!vht_cap || !vht_cap->vht_supported)
		rs_ht_init(mvm, sta, lq_sta, ht_cap);
	else
		rs_vht_init(mvm, sta, lq_sta, vht_cap);
J
Johannes Berg 已提交
2967

2968 2969 2970 2971 2972 2973
	lq_sta->max_legacy_rate_idx =
		rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
	lq_sta->max_siso_rate_idx =
		rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
	lq_sta->max_mimo2_rate_idx =
		rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2974

E
Eyal Shapira 已提交
2975
	IWL_DEBUG_RATE(mvm,
2976
		       "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2977
		       lq_sta->active_legacy_rate,
J
Johannes Berg 已提交
2978
		       lq_sta->active_siso_rate,
E
Eyal Shapira 已提交
2979
		       lq_sta->active_mimo2_rate,
2980 2981
		       lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
		       lq_sta->bfer_capable);
2982 2983 2984 2985
	IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
		       lq_sta->max_legacy_rate_idx,
		       lq_sta->max_siso_rate_idx,
		       lq_sta->max_mimo2_rate_idx);
J
Johannes Berg 已提交
2986 2987 2988

	/* These values will be overridden later */
	lq_sta->lq.single_stream_ant_msk =
2989
		iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
2990
	lq_sta->lq.dual_stream_ant_msk = ANT_AB;
J
Johannes Berg 已提交
2991 2992 2993 2994

	/* as default allow aggregation for all tids */
	lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
	lq_sta->is_agg = 0;
2995
#ifdef CONFIG_IWLWIFI_DEBUGFS
2996
	iwl_mvm_reset_frame_stats(mvm);
2997
#endif
2998
	rs_initialize_lq(mvm, sta, lq_sta, band);
2999 3000
}

3001 3002 3003 3004 3005
static void rs_drv_rate_update(void *mvm_r,
			       struct ieee80211_supported_band *sband,
			       struct cfg80211_chan_def *chandef,
			       struct ieee80211_sta *sta,
			       void *priv_sta, u32 changed)
3006
{
3007 3008
	struct iwl_op_mode *op_mode = mvm_r;
	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3009 3010
	u8 tid;

3011 3012 3013
	if (!iwl_mvm_sta_from_mac80211(sta)->vif)
		return;

3014 3015 3016 3017
	/* Stop any ongoing aggregations as rs starts off assuming no agg */
	for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
		ieee80211_stop_tx_ba_session(sta, tid);

3018
	iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
J
Johannes Berg 已提交
3019 3020
}

3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039
static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
				   struct ieee80211_sta *sta,
				   int tid, struct ieee80211_tx_info *info,
				   bool ndp)
{
	int legacy_success;
	int retries;
	int i;
	struct iwl_lq_cmd *table;
	u32 lq_hwrate;
	struct rs_rate lq_rate, tx_resp_rate;
	struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
	u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
	u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
	u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
	u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;

3040
	if (!lq_sta->pers.drv) {
3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140
		IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
		return;
	}

	/* This packet was aggregated but doesn't carry status info */
	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
		return;

	if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
				    &tx_resp_rate)) {
		WARN_ON_ONCE(1);
		return;
	}

#ifdef CONFIG_MAC80211_DEBUGFS
	/* Disable last tx check if we are debugging with fixed rate but
	 * update tx stats
	 */
	if (lq_sta->pers.dbg_fixed_rate) {
		int index = tx_resp_rate.index;
		enum rs_column column;
		int attempts, success;

		column = rs_get_column_from_rate(&tx_resp_rate);
		if (WARN_ONCE(column == RS_COLUMN_INVALID,
			      "Can't map rate 0x%x to column",
			      tx_resp_hwrate))
			return;

		if (info->flags & IEEE80211_TX_STAT_AMPDU) {
			attempts = info->status.ampdu_len;
			success = info->status.ampdu_ack_len;
		} else {
			attempts = info->status.rates[0].count;
			success = !!(info->flags & IEEE80211_TX_STAT_ACK);
		}

		lq_sta->pers.tx_stats[column][index].total += attempts;
		lq_sta->pers.tx_stats[column][index].success += success;

		IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
			       tx_resp_hwrate, success, attempts);
		return;
	}
#endif

	if (time_after(jiffies,
		       (unsigned long)(lq_sta->last_tx +
				       (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
		IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
		/* reach here only in case of driver RS, call directly
		 * the unlocked version
		 */
		rs_drv_rate_init(mvm, sta, info->band);
		return;
	}
	lq_sta->last_tx = jiffies;

	/* Ignore this Tx frame response if its initial rate doesn't match
	 * that of latest Link Quality command.  There may be stragglers
	 * from a previous Link Quality command, but we're no longer interested
	 * in those; they're either from the "active" mode while we're trying
	 * to check "search" mode, or a prior "search" mode after we've moved
	 * to a new "search" mode (which might become the new "active" mode).
	 */
	table = &lq_sta->lq;
	lq_hwrate = le32_to_cpu(table->rs_table[0]);
	if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
		WARN_ON_ONCE(1);
		return;
	}

	/* Here we actually compare this rate to the latest LQ command */
	if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
		IWL_DEBUG_RATE(mvm,
			       "tx resp color 0x%x does not match 0x%x\n",
			       lq_color, LQ_FLAG_COLOR_GET(table->flags));

		/* Since rates mis-match, the last LQ command may have failed.
		 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
		 * ... driver.
		 */
		lq_sta->missed_rate_counter++;
		if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
			lq_sta->missed_rate_counter = 0;
			IWL_DEBUG_RATE(mvm,
				       "Too many rates mismatch. Send sync LQ. rs_state %d\n",
				       lq_sta->rs_state);
			iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
		}
		/* Regardless, ignore this status info for outdated rate */
		return;
	}

	/* Rate did match, so reset the missed_rate_counter */
	lq_sta->missed_rate_counter = 0;

	if (!lq_sta->search_better_tbl) {
		curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3141
		other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3142
	} else {
3143
		curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3144 3145 3146 3147 3148 3149 3150 3151
		other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
	}

	if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
		IWL_DEBUG_RATE(mvm,
			       "Neither active nor search matches tx rate\n");
		tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
		rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
3152
		tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249
		rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
		rs_dump_rate(mvm, &lq_rate, "ACTUAL");

		/* no matching table found, let's by-pass the data collection
		 * and continue to perform rate scale to find the rate table
		 */
		rs_stay_in_table(lq_sta, true);
		goto done;
	}

	/* Updating the frame history depends on whether packets were
	 * aggregated.
	 *
	 * For aggregation, all packets were transmitted at the same rate, the
	 * first index into rate scale table.
	 */
	if (info->flags & IEEE80211_TX_STAT_AMPDU) {
		rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
				    info->status.ampdu_len,
				    info->status.ampdu_ack_len,
				    reduced_txp);

		/* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
		 * it as a single frame loss as we don't want the success ratio
		 * to dip too quickly because a BA wasn't received.
		 * For TPC, there's no need for this optimisation since we want
		 * to recover very quickly from a bad power reduction and,
		 * therefore we'd like the success ratio to get an immediate hit
		 * when failing to get a BA, so we'd switch back to a lower or
		 * zero power reduction. When FW transmits agg with a rate
		 * different from the initial rate, it will not use reduced txp
		 * and will send BA notification twice (one empty with reduced
		 * txp equal to the value from LQ and one with reduced txp 0).
		 * We need to update counters for each txp level accordingly.
		 */
		if (info->status.ampdu_ack_len == 0)
			info->status.ampdu_len = 1;

		rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
				    tx_resp_rate.index,
				    info->status.ampdu_len,
				    info->status.ampdu_ack_len);

		/* Update success/fail counts if not searching for new mode */
		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
			lq_sta->total_success += info->status.ampdu_ack_len;
			lq_sta->total_failed += (info->status.ampdu_len -
					info->status.ampdu_ack_len);
		}
	} else {
		/* For legacy, update frame history with for each Tx retry. */
		retries = info->status.rates[0].count - 1;
		/* HW doesn't send more than 15 retries */
		retries = min(retries, 15);

		/* The last transmission may have been successful */
		legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
		/* Collect data for each rate used during failed TX attempts */
		for (i = 0; i <= retries; ++i) {
			lq_hwrate = le32_to_cpu(table->rs_table[i]);
			if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
						    &lq_rate)) {
				WARN_ON_ONCE(1);
				return;
			}

			/* Only collect stats if retried rate is in the same RS
			 * table as active/search.
			 */
			if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
				tmp_tbl = curr_tbl;
			else if (rs_rate_column_match(&lq_rate,
						      &other_tbl->rate))
				tmp_tbl = other_tbl;
			else
				continue;

			rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
					    tx_resp_rate.index, 1,
					    i < retries ? 0 : legacy_success,
					    reduced_txp);
			rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
					    tx_resp_rate.index, 1,
					    i < retries ? 0 : legacy_success);
		}

		/* Update success/fail counts if not searching for new mode */
		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
			lq_sta->total_success += legacy_success;
			lq_sta->total_failed += retries + (1 - legacy_success);
		}
	}
	/* The last TX rate is cached in lq_sta; it's set in if/else above */
	lq_sta->last_rate_n_flags = lq_hwrate;
	IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
done:
	/* See if there's a better rate or modulation mode to try. */
3250
	if (sta->deflink.supp_rates[info->band])
3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268
		rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
}

void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
			  int tid, struct ieee80211_tx_info *info, bool ndp)
{
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);

	/* If it's locked we are in middle of init flow
	 * just wait for next tx status to update the lq_sta data
	 */
	if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock))
		return;

	__iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
	spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
}

3269 3270 3271
#ifdef CONFIG_MAC80211_DEBUGFS
static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
					    struct iwl_lq_cmd *lq_cmd,
3272
					    enum nl80211_band band,
3273 3274 3275 3276 3277 3278
					    u32 ucode_rate)
{
	struct rs_rate rate;
	int i;
	int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
	__le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3279
	u8 ant = (ucode_rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3280 3281 3282 3283

	for (i = 0; i < num_rates; i++)
		lq_cmd->rs_table[i] = ucode_rate_le32;

3284 3285 3286 3287
	if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
		WARN_ON_ONCE(1);
		return;
	}
3288 3289 3290 3291 3292

	if (is_mimo(&rate))
		lq_cmd->mimo_delim = num_rates - 1;
	else
		lq_cmd->mimo_delim = 0;
3293 3294 3295 3296 3297 3298

	lq_cmd->reduced_tpc = 0;

	if (num_of_ant(ant) == 1)
		lq_cmd->single_stream_ant_msk = ant;

3299
	if (!mvm->trans->trans_cfg->gen2)
3300 3301 3302 3303
		lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
	else
		lq_cmd->agg_frame_cnt_limit =
			LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3304 3305 3306
}
#endif /* CONFIG_MAC80211_DEBUGFS */

3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321
static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
				     struct iwl_lq_sta *lq_sta,
				     struct rs_rate *rate,
				     __le32 *rs_table, int *rs_table_index,
				     int num_rates, int num_retries,
				     u8 valid_tx_ant, bool toggle_ant)
{
	int i, j;
	__le32 ucode_rate;
	bool bottom_reached = false;
	int prev_rate_idx = rate->index;
	int end = LINK_QUAL_MAX_RETRY_NUM;
	int index = *rs_table_index;

	for (i = 0; i < num_rates && index < end; i++) {
3322 3323 3324
		for (j = 0; j < num_retries && index < end; j++, index++) {
			ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
									 rate));
3325
			rs_table[index] = ucode_rate;
3326 3327 3328
			if (toggle_ant)
				rs_toggle_antenna(valid_tx_ant, rate);
		}
3329 3330 3331 3332 3333 3334 3335

		prev_rate_idx = rate->index;
		bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
		if (bottom_reached && !is_legacy(rate))
			break;
	}

3336
	if (!bottom_reached && !is_legacy(rate))
3337 3338 3339 3340 3341 3342 3343 3344
		rate->index = prev_rate_idx;

	*rs_table_index = index;
}

/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
 * column the rate table should look like this:
 *
3345 3346 3347 3348 3349 3350
 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361
 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
 */
3362
static void rs_build_rates_table(struct iwl_mvm *mvm,
3363
				 struct ieee80211_sta *sta,
3364 3365
				 struct iwl_lq_sta *lq_sta,
				 const struct rs_rate *initial_rate)
J
Johannes Berg 已提交
3366
{
3367
	struct rs_rate rate;
3368
	int num_rates, num_retries, index = 0;
J
Johannes Berg 已提交
3369 3370
	u8 valid_tx_ant = 0;
	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3371
	bool toggle_ant = false;
3372
	u32 color;
J
Johannes Berg 已提交
3373

3374
	memcpy(&rate, initial_rate, sizeof(rate));
3375

3376
	valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3377

3378
	/* TODO: remove old API when min FW API hits 14 */
3379
	if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3380 3381
	    rs_stbc_allow(mvm, sta, lq_sta))
		rate.stbc = true;
J
Johannes Berg 已提交
3382

3383
	if (is_siso(&rate)) {
3384 3385
		num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
		num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3386
	} else if (is_mimo(&rate)) {
3387 3388
		num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
		num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
J
Johannes Berg 已提交
3389
	} else {
3390
		num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3391
		num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3392
		toggle_ant = true;
J
Johannes Berg 已提交
3393 3394
	}

3395 3396 3397
	rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
				 num_rates, num_retries, valid_tx_ant,
				 toggle_ant);
J
Johannes Berg 已提交
3398

3399
	rs_get_lower_rate_down_column(lq_sta, &rate);
J
Johannes Berg 已提交
3400

3401
	if (is_siso(&rate)) {
3402 3403
		num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
		num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3404
		lq_cmd->mimo_delim = index;
3405
	} else if (is_legacy(&rate)) {
3406
		num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3407
		num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3408 3409 3410
	} else {
		WARN_ON_ONCE(1);
	}
J
Johannes Berg 已提交
3411

3412
	toggle_ant = true;
J
Johannes Berg 已提交
3413

3414 3415 3416
	rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
				 num_rates, num_retries, valid_tx_ant,
				 toggle_ant);
J
Johannes Berg 已提交
3417

3418
	rs_get_lower_rate_down_column(lq_sta, &rate);
J
Johannes Berg 已提交
3419

3420
	num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3421
	num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
J
Johannes Berg 已提交
3422

3423 3424 3425
	rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
				 num_rates, num_retries, valid_tx_ant,
				 toggle_ant);
J
Johannes Berg 已提交
3426

3427 3428 3429
	/* update the color of the LQ command (as a counter at bits 1-3) */
	color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
	lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3430 3431
}

3432 3433 3434 3435 3436 3437 3438 3439 3440 3441
struct rs_bfer_active_iter_data {
	struct ieee80211_sta *exclude_sta;
	struct iwl_mvm_sta *bfer_mvmsta;
};

static void rs_bfer_active_iter(void *_data,
				struct ieee80211_sta *sta)
{
	struct rs_bfer_active_iter_data *data = _data;
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3442
	struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510
	u32 ss_params = le32_to_cpu(lq_cmd->ss_params);

	if (sta == data->exclude_sta)
		return;

	/* The current sta has BFER allowed */
	if (ss_params & LQ_SS_BFER_ALLOWED) {
		WARN_ON_ONCE(data->bfer_mvmsta != NULL);

		data->bfer_mvmsta = mvmsta;
	}
}

static int rs_bfer_priority(struct iwl_mvm_sta *sta)
{
	int prio = -1;
	enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);

	switch (viftype) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_P2P_GO:
		prio = 3;
		break;
	case NL80211_IFTYPE_P2P_CLIENT:
		prio = 2;
		break;
	case NL80211_IFTYPE_STATION:
		prio = 1;
		break;
	default:
		WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
		prio = -1;
	}

	return prio;
}

/* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
				struct iwl_mvm_sta *sta2)
{
	int prio1 = rs_bfer_priority(sta1);
	int prio2 = rs_bfer_priority(sta2);

	if (prio1 > prio2)
		return 1;
	if (prio1 < prio2)
		return -1;
	return 0;
}

static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
				struct ieee80211_sta *sta,
				struct iwl_lq_sta *lq_sta,
				const struct rs_rate *initial_rate)
{
	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
	struct rs_bfer_active_iter_data data = {
		.exclude_sta = sta,
		.bfer_mvmsta = NULL,
	};
	struct iwl_mvm_sta *bfer_mvmsta = NULL;
	u32 ss_params = LQ_SS_PARAMS_VALID;

	if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
		goto out;

3511
#ifdef CONFIG_MAC80211_DEBUGFS
3512 3513 3514
	/* Check if forcing the decision is configured.
	 * Note that SISO is forced by not allowing STBC or BFER
	 */
3515
	if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3516
		ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3517
	else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3518 3519
		ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);

3520
	if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3521
		IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3522
			       lq_sta->pers.ss_force);
3523 3524
		goto out;
	}
3525
#endif
3526

3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553
	if (lq_sta->stbc_capable)
		ss_params |= LQ_SS_STBC_1SS_ALLOWED;

	if (!lq_sta->bfer_capable)
		goto out;

	ieee80211_iterate_stations_atomic(mvm->hw,
					  rs_bfer_active_iter,
					  &data);
	bfer_mvmsta = data.bfer_mvmsta;

	/* This code is safe as it doesn't run concurrently for different
	 * stations. This is guaranteed by the fact that calls to
	 * ieee80211_tx_status wouldn't run concurrently for a single HW.
	 */
	if (!bfer_mvmsta) {
		IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");

		ss_params |= LQ_SS_BFER_ALLOWED;
		goto out;
	}

	IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
		       bfer_mvmsta->sta_id);

	/* Disallow BFER on another STA if active and we're a higher priority */
	if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3554 3555
		struct iwl_lq_cmd *bfersta_lq_cmd =
			&bfer_mvmsta->lq_sta.rs_drv.lq;
3556 3557 3558 3559
		u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);

		bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
		bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3560
		iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
3561 3562 3563 3564 3565 3566 3567 3568 3569 3570

		ss_params |= LQ_SS_BFER_ALLOWED;
		IWL_DEBUG_RATE(mvm,
			       "Lower priority BFER sta found (%d). Switch BFER\n",
			       bfer_mvmsta->sta_id);
	}
out:
	lq_cmd->ss_params = cpu_to_le32(ss_params);
}

3571 3572 3573 3574 3575 3576
static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
			   struct ieee80211_sta *sta,
			   struct iwl_lq_sta *lq_sta,
			   const struct rs_rate *initial_rate)
{
	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3577 3578 3579
	struct iwl_mvm_sta *mvmsta;
	struct iwl_mvm_vif *mvmvif;

3580
	lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3581
	lq_cmd->agg_time_limit =
3582
		cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3583 3584

#ifdef CONFIG_MAC80211_DEBUGFS
3585
	if (lq_sta->pers.dbg_fixed_rate) {
3586 3587
		rs_build_rates_table_from_fixed(mvm, lq_cmd,
						lq_sta->band,
3588
						lq_sta->pers.dbg_fixed_rate);
3589 3590
		return;
	}
3591
#endif
3592 3593
	if (WARN_ON_ONCE(!sta || !initial_rate))
		return;
3594

3595
	rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
J
Johannes Berg 已提交
3596

3597
	if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3598 3599
		rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);

3600 3601
	mvmsta = iwl_mvm_sta_from_mac80211(sta);
	mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3602

3603 3604
	if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
	    num_of_ant(initial_rate->ant) == 1)
3605 3606 3607 3608 3609
		lq_cmd->single_stream_ant_msk = initial_rate->ant;

	lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;

	/*
S
Sara Sharon 已提交
3610
	 * In case of low latency, tell the firmware to leave a frame in the
3611 3612 3613
	 * Tx Fifo so that it can start a transaction in the same TxOP. This
	 * basically allows the firmware to send bursts.
	 */
3614
	if (iwl_mvm_vif_low_latency(mvmvif))
3615 3616
		lq_cmd->agg_frame_cnt_limit--;

3617 3618 3619
	if (mvmsta->vif->p2p)
		lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;

3620
	lq_cmd->agg_time_limit =
3621
			cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
J
Johannes Berg 已提交
3622 3623
}

3624
static void *rs_alloc(struct ieee80211_hw *hw)
J
Johannes Berg 已提交
3625 3626 3627
{
	return hw->priv;
}
3628

J
Johannes Berg 已提交
3629 3630 3631 3632 3633 3634
/* rate scale requires free function to be implemented */
static void rs_free(void *mvm_rate)
{
	return;
}

3635
static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
J
Johannes Berg 已提交
3636 3637 3638 3639 3640 3641 3642 3643
{
	struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);

	IWL_DEBUG_RATE(mvm, "enter\n");
	IWL_DEBUG_RATE(mvm, "leave\n");
}

3644
int rs_pretty_print_rate_v1(char *buf, int bufsz, const u32 rate)
3645 3646
{

3647
	char *type;
3648
	u8 mcs = 0, nss = 0;
3649
	u8 ant = (rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3650 3651
	u32 bw = (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) >>
		RATE_MCS_CHAN_WIDTH_POS;
3652

3653 3654 3655
	if (!(rate & RATE_MCS_HT_MSK_V1) &&
	    !(rate & RATE_MCS_VHT_MSK_V1) &&
	    !(rate & RATE_MCS_HE_MSK_V1)) {
3656 3657
		int index = iwl_hwrate_to_plcp_idx(rate);

3658
		return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps",
3659
				 iwl_rs_pretty_ant(ant),
3660
				 index == IWL_RATE_INVALID ? "BAD" :
3661
				 iwl_rate_mcs(index)->mbps);
3662 3663
	}

3664
	if (rate & RATE_MCS_VHT_MSK_V1) {
3665 3666 3667 3668
		type = "VHT";
		mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
		nss = ((rate & RATE_VHT_MCS_NSS_MSK)
		       >> RATE_VHT_MCS_NSS_POS) + 1;
3669
	} else if (rate & RATE_MCS_HT_MSK_V1) {
3670
		type = "HT";
3671 3672 3673 3674
		mcs = rate & RATE_HT_MCS_INDEX_MSK_V1;
		nss = ((rate & RATE_HT_MCS_NSS_MSK_V1)
		       >> RATE_HT_MCS_NSS_POS_V1) + 1;
	} else if (rate & RATE_MCS_HE_MSK_V1) {
3675 3676 3677 3678
		type = "HE";
		mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
		nss = ((rate & RATE_VHT_MCS_NSS_MSK)
		       >> RATE_VHT_MCS_NSS_POS) + 1;
3679 3680 3681 3682
	} else {
		type = "Unknown"; /* shouldn't happen */
	}

3683
	return scnprintf(buf, bufsz,
3684
			 "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s",
3685
			 rate, type, iwl_rs_pretty_ant(ant), iwl_rs_pretty_bw(bw), mcs, nss,
3686
			 (rate & RATE_MCS_SGI_MSK_V1) ? "SGI " : "NGI ",
3687
			 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3688
			 (rate & RATE_MCS_LDPC_MSK_V1) ? "LDPC " : "",
3689
			 (rate & RATE_HE_DUAL_CARRIER_MODE_MSK) ? "DCM " : "",
3690
			 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3691 3692
}

3693
#ifdef CONFIG_MAC80211_DEBUGFS
3694
/*
3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707
 * Program the device to use fixed rate for frame transmit
 * This is for debugging/testing only
 * once the device start use fixed rate, we need to reload the module
 * to being back the normal operation.
 */
static void rs_program_fix_rate(struct iwl_mvm *mvm,
				struct iwl_lq_sta *lq_sta)
{
	lq_sta->active_legacy_rate = 0x0FFF;	/* 1 - 54 MBits, includes CCK */
	lq_sta->active_siso_rate   = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
	lq_sta->active_mimo2_rate  = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */

	IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3708
		       lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3709

3710
	if (lq_sta->pers.dbg_fixed_rate) {
3711
		rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3712
		iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
3713 3714 3715
	}
}

3716 3717 3718 3719 3720 3721 3722 3723 3724
static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
			const char __user *user_buf, size_t count, loff_t *ppos)
{
	struct iwl_lq_sta *lq_sta = file->private_data;
	struct iwl_mvm *mvm;
	char buf[64];
	size_t buf_size;
	u32 parsed_rate;

3725
	mvm = lq_sta->pers.drv;
3726 3727 3728 3729 3730 3731
	memset(buf, 0, sizeof(buf));
	buf_size = min(count, sizeof(buf) -  1);
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;

	if (sscanf(buf, "%x", &parsed_rate) == 1)
3732
		lq_sta->pers.dbg_fixed_rate = parsed_rate;
3733
	else
3734
		lq_sta->pers.dbg_fixed_rate = 0;
3735 3736 3737 3738 3739 3740

	rs_program_fix_rate(mvm, lq_sta);

	return count;
}

J
Johannes Berg 已提交
3741 3742 3743 3744 3745 3746 3747
static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
			char __user *user_buf, size_t count, loff_t *ppos)
{
	char *buff;
	int desc = 0;
	int i = 0;
	ssize_t ret;
3748
	static const size_t bufsz = 2048;
J
Johannes Berg 已提交
3749 3750

	struct iwl_lq_sta *lq_sta = file->private_data;
3751
	struct iwl_mvm_sta *mvmsta =
3752
		container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
J
Johannes Berg 已提交
3753 3754
	struct iwl_mvm *mvm;
	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3755
	struct rs_rate *rate = &tbl->rate;
3756
	u32 ss_params;
3757

3758
	mvm = lq_sta->pers.drv;
3759
	buff = kmalloc(bufsz, GFP_KERNEL);
J
Johannes Berg 已提交
3760 3761 3762
	if (!buff)
		return -ENOMEM;

3763 3764 3765 3766 3767 3768 3769 3770
	desc += scnprintf(buff + desc, bufsz - desc,
			  "sta_id %d\n", lq_sta->lq.sta_id);
	desc += scnprintf(buff + desc, bufsz - desc,
			  "failed=%d success=%d rate=0%lX\n",
			  lq_sta->total_failed, lq_sta->total_success,
			  lq_sta->active_legacy_rate);
	desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
			  lq_sta->pers.dbg_fixed_rate);
3771
	desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s\n",
3772
	    (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3773
	    (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "");
3774 3775 3776
	desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
			  (is_legacy(rate)) ? "legacy" :
			  is_vht(rate) ? "VHT" : "HT");
3777
	if (!is_legacy(rate)) {
3778
		desc += scnprintf(buff + desc, bufsz - desc, " %s",
3779
		   (is_siso(rate)) ? "SISO" : "MIMO2");
3780
		desc += scnprintf(buff + desc, bufsz - desc, " %s",
3781 3782
				(is_ht20(rate)) ? "20MHz" :
				(is_ht40(rate)) ? "40MHz" :
3783 3784
				(is_ht80(rate)) ? "80MHz" :
				(is_ht160(rate)) ? "160MHz" : "BAD BW");
3785
		desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3786 3787
				(rate->sgi) ? "SGI" : "NGI",
				(rate->ldpc) ? "LDPC" : "BCC",
3788
				(lq_sta->is_agg) ? "AGG on" : "",
3789
				(mvmsta->amsdu_enabled) ? "AMSDU on" : "");
J
Johannes Berg 已提交
3790
	}
3791
	desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
J
Johannes Berg 已提交
3792
			lq_sta->last_rate_n_flags);
3793
	desc += scnprintf(buff + desc, bufsz - desc,
3794
			"general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
J
Johannes Berg 已提交
3795 3796 3797 3798 3799
			lq_sta->lq.flags,
			lq_sta->lq.mimo_delim,
			lq_sta->lq.single_stream_ant_msk,
			lq_sta->lq.dual_stream_ant_msk);

3800
	desc += scnprintf(buff + desc, bufsz - desc,
J
Johannes Berg 已提交
3801 3802 3803 3804 3805
			"agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
			le16_to_cpu(lq_sta->lq.agg_time_limit),
			lq_sta->lq.agg_disable_start_th,
			lq_sta->lq.agg_frame_cnt_limit);

3806 3807
	desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
			  lq_sta->lq.reduced_tpc);
3808
	ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3809 3810
	desc += scnprintf(buff + desc, bufsz - desc,
			"single stream params: %s%s%s%s\n",
3811
			(ss_params & LQ_SS_PARAMS_VALID) ?
3812
			"VALID" : "INVALID",
3813
			(ss_params & LQ_SS_BFER_ALLOWED) ?
3814
			", BFER" : "",
3815
			(ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3816
			", STBC" : "",
3817
			(ss_params & LQ_SS_FORCE) ?
3818
			", FORCE" : "");
3819
	desc += scnprintf(buff + desc, bufsz - desc,
J
Johannes Berg 已提交
3820 3821 3822 3823 3824 3825 3826
			"Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
			lq_sta->lq.initial_rate_index[0],
			lq_sta->lq.initial_rate_index[1],
			lq_sta->lq.initial_rate_index[2],
			lq_sta->lq.initial_rate_index[3]);

	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3827
		u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3828

3829 3830
		desc += scnprintf(buff + desc, bufsz - desc,
				  " rate[%d] 0x%X ", i, r);
3831
		desc += rs_pretty_print_rate_v1(buff + desc, bufsz - desc, r);
3832 3833
		if (desc < bufsz - 1)
			buff[desc++] = '\n';
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3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853
	}

	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
	kfree(buff);
	return ret;
}

static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
	.write = rs_sta_dbgfs_scale_table_write,
	.read = rs_sta_dbgfs_scale_table_read,
	.open = simple_open,
	.llseek = default_llseek,
};
static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
			char __user *user_buf, size_t count, loff_t *ppos)
{
	char *buff;
	int desc = 0;
	int i, j;
	ssize_t ret;
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	struct iwl_scale_tbl_info *tbl;
3855
	struct rs_rate *rate;
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3856 3857 3858 3859 3860 3861 3862
	struct iwl_lq_sta *lq_sta = file->private_data;

	buff = kmalloc(1024, GFP_KERNEL);
	if (!buff)
		return -ENOMEM;

	for (i = 0; i < LQ_SIZE; i++) {
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3863
		tbl = &(lq_sta->lq_info[i]);
3864
		rate = &tbl->rate;
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		desc += sprintf(buff+desc,
3866
				"%s type=%d SGI=%d BW=%s DUP=0\n"
3867
				"index=%d\n",
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				lq_sta->active_tbl == i ? "*" : "x",
3869 3870
				rate->type,
				rate->sgi,
3871 3872 3873 3874
				is_ht20(rate) ? "20MHz" :
				is_ht40(rate) ? "40MHz" :
				is_ht80(rate) ? "80MHz" :
				is_ht160(rate) ? "160MHz" : "ERR",
3875
				rate->index);
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		for (j = 0; j < IWL_RATE_COUNT; j++) {
			desc += sprintf(buff+desc,
				"counter=%d success=%d %%=%d\n",
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3879 3880 3881
				tbl->win[j].counter,
				tbl->win[j].success_counter,
				tbl->win[j].success_ratio);
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3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894
		}
	}
	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
	kfree(buff);
	return ret;
}

static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
	.read = rs_sta_dbgfs_stats_table_read,
	.open = simple_open,
	.llseek = default_llseek,
};

3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925
static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
					      char __user *user_buf,
					      size_t count, loff_t *ppos)
{
	static const char * const column_name[] = {
		[RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
		[RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
		[RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
		[RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
		[RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
		[RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
		[RS_COLUMN_MIMO2] = "MIMO2",
		[RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
	};

	static const char * const rate_name[] = {
		[IWL_RATE_1M_INDEX] = "1M",
		[IWL_RATE_2M_INDEX] = "2M",
		[IWL_RATE_5M_INDEX] = "5.5M",
		[IWL_RATE_11M_INDEX] = "11M",
		[IWL_RATE_6M_INDEX] = "6M|MCS0",
		[IWL_RATE_9M_INDEX] = "9M",
		[IWL_RATE_12M_INDEX] = "12M|MCS1",
		[IWL_RATE_18M_INDEX] = "18M|MCS2",
		[IWL_RATE_24M_INDEX] = "24M|MCS3",
		[IWL_RATE_36M_INDEX] = "36M|MCS4",
		[IWL_RATE_48M_INDEX] = "48M|MCS5",
		[IWL_RATE_54M_INDEX] = "54M|MCS6",
		[IWL_RATE_MCS_7_INDEX] = "MCS7",
		[IWL_RATE_MCS_8_INDEX] = "MCS8",
		[IWL_RATE_MCS_9_INDEX] = "MCS9",
3926 3927
		[IWL_RATE_MCS_10_INDEX] = "MCS10",
		[IWL_RATE_MCS_11_INDEX] = "MCS11",
3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953
	};

	char *buff, *pos, *endpos;
	int col, rate;
	ssize_t ret;
	struct iwl_lq_sta *lq_sta = file->private_data;
	struct rs_rate_stats *stats;
	static const size_t bufsz = 1024;

	buff = kmalloc(bufsz, GFP_KERNEL);
	if (!buff)
		return -ENOMEM;

	pos = buff;
	endpos = pos + bufsz;

	pos += scnprintf(pos, endpos - pos, "COLUMN,");
	for (rate = 0; rate < IWL_RATE_COUNT; rate++)
		pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
	pos += scnprintf(pos, endpos - pos, "\n");

	for (col = 0; col < RS_COLUMN_COUNT; col++) {
		pos += scnprintf(pos, endpos - pos,
				 "%s,", column_name[col]);

		for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3954
			stats = &(lq_sta->pers.tx_stats[col][rate]);
3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972
			pos += scnprintf(pos, endpos - pos,
					 "%llu/%llu,",
					 stats->success,
					 stats->total);
		}
		pos += scnprintf(pos, endpos - pos, "\n");
	}

	ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
	kfree(buff);
	return ret;
}

static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
					       const char __user *user_buf,
					       size_t count, loff_t *ppos)
{
	struct iwl_lq_sta *lq_sta = file->private_data;
3973
	memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984

	return count;
}

static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
	.read = rs_sta_dbgfs_drv_tx_stats_read,
	.write = rs_sta_dbgfs_drv_tx_stats_write,
	.open = simple_open,
	.llseek = default_llseek,
};

3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000
static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
				       char __user *user_buf,
				       size_t count, loff_t *ppos)
{
	struct iwl_lq_sta *lq_sta = file->private_data;
	char buf[12];
	int bufsz = sizeof(buf);
	int pos = 0;
	static const char * const ss_force_name[] = {
		[RS_SS_FORCE_NONE] = "none",
		[RS_SS_FORCE_STBC] = "stbc",
		[RS_SS_FORCE_BFER] = "bfer",
		[RS_SS_FORCE_SISO] = "siso",
	};

	pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4001
			 ss_force_name[lq_sta->pers.ss_force]);
4002 4003 4004 4005 4006 4007 4008 4009 4010 4011
	return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
}

static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
					size_t count, loff_t *ppos)
{
	struct iwl_mvm *mvm = lq_sta->pers.drv;
	int ret = 0;

	if (!strncmp("none", buf, 4)) {
4012
		lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4013
	} else if (!strncmp("siso", buf, 4)) {
4014
		lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4015 4016
	} else if (!strncmp("stbc", buf, 4)) {
		if (lq_sta->stbc_capable) {
4017
			lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4018 4019 4020 4021 4022 4023 4024
		} else {
			IWL_ERR(mvm,
				"can't force STBC. peer doesn't support\n");
			ret = -EINVAL;
		}
	} else if (!strncmp("bfer", buf, 4)) {
		if (lq_sta->bfer_capable) {
4025
			lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040
		} else {
			IWL_ERR(mvm,
				"can't force BFER. peer doesn't support\n");
			ret = -EINVAL;
		}
	} else {
		IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
		ret = -EINVAL;
	}
	return ret ?: count;
}

#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
	_MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
#define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {		\
4041 4042
		debugfs_create_file(#name, mode, parent, lq_sta,	\
				    &iwl_dbgfs_##name##_ops);		\
4043 4044 4045 4046
	} while (0)

MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);

4047 4048
static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
				   struct dentry *dir)
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{
4050 4051 4052
	struct iwl_lq_sta *lq_sta = priv_sta;
	struct iwl_mvm_sta *mvmsta;

4053
	mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4054 4055 4056

	if (!mvmsta->vif)
		return;
4057

4058
	debugfs_create_file("rate_scale_table", 0600, dir,
4059
			    lq_sta, &rs_sta_dbgfs_scale_table_ops);
4060
	debugfs_create_file("rate_stats_table", 0400, dir,
4061
			    lq_sta, &rs_sta_dbgfs_stats_table_ops);
4062
	debugfs_create_file("drv_tx_stats", 0600, dir,
4063
			    lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4064
	debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4065
			  &lq_sta->tx_agg_tid_en);
4066
	debugfs_create_u8("reduced_tpc", 0600, dir,
4067
			  &lq_sta->pers.dbg_fixed_txp_reduction);
4068

4069
	MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
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4070 4071 4072 4073 4074 4075 4076 4077
}
#endif

/*
 * Initialization of rate scaling information is done by driver after
 * the station is added. Since mac80211 calls this function before a
 * station is added we ignore it.
 */
4078 4079 4080 4081
static void rs_rate_init_ops(void *mvm_r,
			     struct ieee80211_supported_band *sband,
			     struct cfg80211_chan_def *chandef,
			     struct ieee80211_sta *sta, void *mvm_sta)
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4082 4083
{
}
4084

4085 4086
/* ops for rate scaling implemented in the driver */
static const struct rate_control_ops rs_mvm_ops_drv = {
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	.name = RS_NAME,
4088 4089 4090
	.tx_status = rs_drv_mac80211_tx_status,
	.get_rate = rs_drv_get_rate,
	.rate_init = rs_rate_init_ops,
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4091 4092
	.alloc = rs_alloc,
	.free = rs_free,
4093
	.alloc_sta = rs_drv_alloc_sta,
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4094
	.free_sta = rs_free_sta,
4095
	.rate_update = rs_drv_rate_update,
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4096
#ifdef CONFIG_MAC80211_DEBUGFS
4097
	.add_sta_debugfs = rs_drv_add_sta_debugfs,
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4098
#endif
4099
	.capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
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4100 4101
};

4102
void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4103
			  enum nl80211_band band, bool update)
4104
{
4105
	if (iwl_mvm_has_tlc_offload(mvm)) {
4106
		rs_fw_rate_init(mvm, sta, band, update);
4107 4108 4109
	} else {
		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);

4110
		spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock);
4111
		rs_drv_rate_init(mvm, sta, band);
4112
		spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
4113
	}
4114 4115
}

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4116 4117
int iwl_mvm_rate_control_register(void)
{
4118
	return ieee80211_rate_control_register(&rs_mvm_ops_drv);
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4119 4120 4121 4122
}

void iwl_mvm_rate_control_unregister(void)
{
4123
	ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
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4124
}
4125

4126 4127
static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
				bool enable)
4128
{
4129
	struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4130

4131 4132 4133 4134
	lockdep_assert_held(&mvm->mutex);

	if (enable) {
		if (mvmsta->tx_protection == 0)
4135
			lq->flags |= LQ_FLAG_USE_RTS_MSK;
4136 4137 4138 4139
		mvmsta->tx_protection++;
	} else {
		mvmsta->tx_protection--;
		if (mvmsta->tx_protection == 0)
4140
			lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4141 4142
	}

4143
	return iwl_mvm_send_lq_cmd(mvm, lq);
4144
}
4145 4146 4147

/**
 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4148
 * @mvm: The mvm component
4149 4150 4151 4152 4153 4154
 * @mvmsta: The station
 * @enable: Enable Tx protection?
 */
int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
			  bool enable)
{
4155
	if (iwl_mvm_has_tlc_offload(mvm))
4156 4157 4158 4159
		return rs_fw_tx_protection(mvm, mvmsta, enable);
	else
		return rs_drv_tx_protection(mvm, mvmsta, enable);
}