rs.c 112.5 KB
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/******************************************************************************
 *
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 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
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 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
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 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/
#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 RS_NAME "iwl-mvm-rs"

#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,
	[ANT_B] = ANT_C,
	[ANT_AB] = ANT_BC,
	[ANT_C] = ANT_A,
	[ANT_AC] = ANT_AB,
	[ANT_BC] = ANT_AC,
	[ANT_ABC] = ANT_ABC,
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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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	struct iwl_mvm_sta *mvmsta;
	struct iwl_mvm_vif *mvmvif;

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	if (!sta->ht_cap.ht_supported)
		return false;

	if (sta->smps_mode == IEEE80211_SMPS_STATIC)
		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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	mvmsta = iwl_mvm_sta_from_mac80211(sta);
	mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);

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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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{
	if (!sta->ht_cap.ht_supported)
		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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{
	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
	struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;

	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;

	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 */
	return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
}

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

	if (rate_n_flags & RATE_MCS_HT_MSK) {
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		idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
		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) {
		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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	} 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,
				  int tid);
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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);

/**
 * 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_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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/* mbps, mcs */
static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
	{  "1", "BPSK DSSS"},
	{  "2", "QPSK DSSS"},
	{"5.5", "BPSK CCK"},
	{ "11", "QPSK CCK"},
	{  "6", "BPSK 1/2"},
	{  "9", "BPSK 1/2"},
	{ "12", "QPSK 1/2"},
	{ "18", "QPSK 3/4"},
	{ "24", "16QAM 1/2"},
	{ "36", "16QAM 3/4"},
	{ "48", "64QAM 2/3"},
	{ "54", "64QAM 3/4"},
	{ "60", "64QAM 5/6"},
};

#define MCS_INDEX_PER_STREAM	(8)

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static const char *rs_pretty_ant(u8 ant)
{
	static const char * const ant_name[] = {
		[ANT_NONE] = "None",
		[ANT_A]    = "A",
		[ANT_B]    = "B",
		[ANT_AB]   = "AB",
		[ANT_C]    = "C",
		[ANT_AC]   = "AC",
		[ANT_BC]   = "BC",
		[ANT_ABC]  = "ABC",
	};

	if (ant > ANT_ABC)
		return "UNKNOWN";

	return ant_name[ant];
}

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",
	};

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

	return lq_types[type];
}

524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566
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;

	if (is_type_legacy(rate->type))
		rate_str = legacy_rates[rate->index];
	else if (is_type_ht(rate->type) || is_type_vht(rate->type))
		rate_str = ht_vht_rates[rate->index];
	else
		rate_str = "BAD_RATE";

	sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
		rs_pretty_ant(rate->ant), rate_str);
	return buf;
}

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static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
				const char *prefix)
{
570
	IWL_DEBUG_RATE(mvm,
571 572 573
		       "%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;
}

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static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
					    struct iwl_scale_tbl_info *tbl)
587 588 589
{
	int i;

590
	IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
591 592
	for (i = 0; i < IWL_RATE_COUNT; i++)
		rs_rate_scale_clear_window(&tbl->win[i]);
593 594 595

	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,
604 605
				     struct iwl_lq_sta *lq_data, u8 tid,
				     struct ieee80211_sta *sta)
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{
	int ret = -EAGAIN;

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	IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
		     sta->addr, tid);
	ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
	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;
}

static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
			      struct iwl_lq_sta *lq_data,
			      struct ieee80211_sta *sta)
{
	if (tid < IWL_MAX_TID_COUNT)
		rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
	else
		IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
			tid, IWL_MAX_TID_COUNT);
}

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

/*
 * 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;
}

/**
 * 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.
 */
661 662
static int _rs_collect_tx_data(struct iwl_mvm *mvm,
			       struct iwl_scale_tbl_info *tbl,
663 664
			       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. */
717 718
	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_tx_data(struct iwl_mvm *mvm,
			      struct iwl_lq_sta *lq_sta,
728
			      struct iwl_scale_tbl_info *tbl,
729 730
			      int scale_index, int attempts, int successes,
			      u8 reduced_txp)
731 732
{
	struct iwl_rate_scale_data *window = NULL;
733
	int ret;
734 735 736 737

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

738
	if (tbl->column != RS_COLUMN_INVALID) {
739 740 741 742
		struct lq_sta_pers *pers = &lq_sta->pers;

		pers->tx_stats[tbl->column][scale_index].total += attempts;
		pers->tx_stats[tbl->column][scale_index].success += successes;
743 744
	}

745 746 747
	/* Select window for current tx bit rate */
	window = &(tbl->win[scale_index]);

748
	ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
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				  window);
	if (ret)
		return ret;

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

	window = &tbl->tpc_win[reduced_txp];
757
	return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
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				   window);
}

761 762
/* Convert rs_rate object into ucode rate bitmask */
static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
763
				  struct rs_rate *rate)
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{
765 766
	u32 ucode_rate = 0;
	int index = rate->index;
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768
	ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
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			 RATE_MCS_ANT_ABC_MSK);

771 772
	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)
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			ucode_rate |= RATE_MCS_CCK_MSK;
		return ucode_rate;
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	}

778
	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);
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			index = IWL_LAST_HT_RATE;
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		}
783
		ucode_rate |= RATE_MCS_HT_MSK;
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		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
790
			WARN_ON_ONCE(1);
791
	} 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;
		}
796 797 798 799 800
		ucode_rate |= RATE_MCS_VHT_MSK;
		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 {
805
		IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
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	}

808 809 810 811 812 813
	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;
		ucode_rate |= RATE_MCS_VHT_STBC_MSK;
	}

814 815 816
	ucode_rate |= rate->bw;
	if (rate->sgi)
		ucode_rate |= RATE_MCS_SGI_MSK;
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	if (rate->ldpc)
		ucode_rate |= RATE_MCS_LDPC_MSK;
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	return ucode_rate;
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}

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/* Convert a ucode rate into an rs_rate object */
static int rs_rate_from_ucode_rate(const u32 ucode_rate,
				   enum ieee80211_band band,
				   struct rs_rate *rate)
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{
828 829
	u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
	u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
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	u8 nss;
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832
	memset(rate, 0, sizeof(*rate));
833
	rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
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835
	if (rate->index == IWL_RATE_INVALID)
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		return -EINVAL;
837 838

	rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
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	/* Legacy */
841 842
	if (!(ucode_rate & RATE_MCS_HT_MSK) &&
	    !(ucode_rate & RATE_MCS_VHT_MSK)) {
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		if (num_of_ant == 1) {
			if (band == IEEE80211_BAND_5GHZ)
845
				rate->type = LQ_LEGACY_A;
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			else
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				rate->type = LQ_LEGACY_G;
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		}
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		return 0;
	}

	/* HT or VHT */
854 855
	if (ucode_rate & RATE_MCS_SGI_MSK)
		rate->sgi = true;
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	if (ucode_rate & RATE_MCS_LDPC_MSK)
		rate->ldpc = true;
858 859
	if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
		rate->stbc = true;
860 861
	if (ucode_rate & RATE_MCS_BF_MSK)
		rate->bfer = true;
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863
	rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
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865 866
	if (ucode_rate & RATE_MCS_HT_MSK) {
		nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
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		       RATE_HT_MCS_NSS_POS) + 1;

		if (nss == 1) {
870
			rate->type = LQ_HT_SISO;
871 872 873
			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) {
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			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);
		}
880 881
	} else if (ucode_rate & RATE_MCS_VHT_MSK) {
		nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
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		       RATE_VHT_MCS_NSS_POS) + 1;

		if (nss == 1) {
885
			rate->type = LQ_VHT_SISO;
886 887 888
			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) {
890
			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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		}
	}
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897 898 899
	WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
	WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
		     !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 */
906
static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
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{
	u8 new_ant_type;

910
	if (!rate->ant || rate->ant > ANT_ABC)
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		return 0;

913
	if (!rs_is_valid_ant(valid_ant, rate->ant))
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		return 0;

916
	new_ant_type = ant_toggle_lookup[rate->ant];
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918
	while ((new_ant_type != rate->ant) &&
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	       !rs_is_valid_ant(valid_ant, new_ant_type))
		new_ant_type = ant_toggle_lookup[new_ant_type];

922
	if (new_ant_type == rate->ant)
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		return 0;

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	rate->ant = new_ant_type;

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	return 1;
}

static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
931
				  struct rs_rate *rate)
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{
933
	if (is_legacy(rate))
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		return lq_sta->active_legacy_rate;
935
	else if (is_siso(rate))
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		return lq_sta->active_siso_rate;
937
	else if (is_mimo2(rate))
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		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 */
952
	if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
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		int i;
		u32 mask;

		/* Find the previous rate that is in the rate mask */
		i = index - 1;
		for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
			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;
}

998 999
static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
				     struct rs_rate *rate)
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{
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	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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1011
	u16 high_low;
1012
	u16 rate_mask;
1013
	struct iwl_mvm *mvm = lq_sta->pers.drv;
1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031

	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)
{
1032
	struct iwl_mvm *mvm = lq_sta->pers.drv;
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1033

1034 1035 1036 1037 1038
	if (is_legacy(rate)) {
		/* No column to downgrade from Legacy */
		return;
	} else if (is_siso(rate)) {
		/* Downgrade to Legacy if we were in SISO */
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1039
		if (lq_sta->band == IEEE80211_BAND_5GHZ)
1040
			rate->type = LQ_LEGACY_A;
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1041
		else
1042
			rate->type = LQ_LEGACY_G;
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1043

1044
		rate->bw = RATE_MCS_CHAN_WIDTH_20;
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1045

1046
		WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1047
			     rate->index > IWL_RATE_MCS_9_INDEX);
J
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1048

1049
		rate->index = rs_ht_to_legacy[rate->index];
E
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1050
		rate->ldpc = false;
1051 1052 1053 1054
	} 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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1055 1056
	}

1057
	if (num_of_ant(rate->ant) > 1)
1058
		rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
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1059

1060 1061 1062 1063 1064
	/* 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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1065 1066
}

1067 1068 1069 1070
/* Check if both rates are identical
 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
 * with a rate indicating STBC/BFER and ANT_AB.
 */
1071
static inline bool rs_rate_equal(struct rs_rate *a,
1072 1073 1074
				 struct rs_rate *b,
				 bool allow_ant_mismatch)

1075
{
1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
	bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
		(a->bfer == b->bfer);

	if (allow_ant_mismatch) {
		if (a->stbc || a->bfer) {
			WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
				  a->stbc, a->bfer, a->ant);
			ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
		} else if (b->stbc || b->bfer) {
			WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
				  b->stbc, b->bfer, b->ant);
			ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
		}
	}

1091
	return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1092
		(a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1093 1094 1095 1096 1097
}

/* 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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1098
{
1099 1100
	bool ant_match;

1101
	if (a->stbc || a->bfer)
1102 1103 1104 1105 1106 1107
		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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1108 1109
}

1110 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
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;
}

1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157
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;
}

void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
			  int tid, struct ieee80211_tx_info *info)
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1158 1159 1160
{
	int legacy_success;
	int retries;
1161
	int i;
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1162
	struct iwl_lq_cmd *table;
1163 1164
	u32 lq_hwrate;
	struct rs_rate lq_rate, tx_resp_rate;
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1165
	struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1166
	u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1167
	u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1168 1169
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1170 1171
	bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
					     IWL_UCODE_TLV_API_LQ_SS_PARAMS);
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1172 1173 1174 1175 1176

	/* Treat uninitialized rate scaling data same as non-existing. */
	if (!lq_sta) {
		IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
		return;
1177
	} else if (!lq_sta->pers.drv) {
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1178 1179 1180 1181
		IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
		return;
	}

1182 1183 1184 1185 1186 1187 1188
	/* This packet was aggregated but doesn't carry status info */
	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
		return;

	rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);

1189
#ifdef CONFIG_MAC80211_DEBUGFS
1190 1191
	/* Disable last tx check if we are debugging with fixed rate but
	 * update tx stats */
1192
	if (lq_sta->pers.dbg_fixed_rate) {
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215
		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);
1216 1217 1218
		return;
	}
#endif
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1219

1220
	if (time_after(jiffies,
1221 1222
		       (unsigned long)(lq_sta->last_tx +
				       (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1223 1224
		int t;

1225
		IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1226 1227
		for (t = 0; t < IWL_MAX_TID_COUNT; t++)
			ieee80211_stop_tx_ba_session(sta, t);
1228

1229
		iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1230 1231 1232 1233
		return;
	}
	lq_sta->last_tx = jiffies;

1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
	/* 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]);
	rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);

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1245
	/* Here we actually compare this rate to the latest LQ command */
1246
	if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
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1247
		IWL_DEBUG_RATE(mvm,
1248 1249 1250
			       "initial tx resp rate 0x%x does not match 0x%x\n",
			       tx_resp_hwrate, lq_hwrate);

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1251 1252 1253 1254 1255 1256
		/*
		 * 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++;
1257
		if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
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1258
			lq_sta->missed_rate_counter = 0;
1259 1260 1261
			IWL_DEBUG_RATE(mvm,
				       "Too many rates mismatch. Send sync LQ. rs_state %d\n",
				       lq_sta->rs_state);
1262
			iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
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1263 1264 1265 1266 1267 1268 1269
		}
		/* Regardless, ignore this status info for outdated rate */
		return;
	} else
		/* Rate did match, so reset the missed_rate_counter */
		lq_sta->missed_rate_counter = 0;

1270
	if (!lq_sta->search_better_tbl) {
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1271 1272
		curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
		other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1273
	} else {
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1274 1275
		curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
		other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1276 1277
	}

1278
	if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
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1279 1280 1281
		IWL_DEBUG_RATE(mvm,
			       "Neither active nor search matches tx rate\n");
		tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1282
		rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
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1283
		tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1284
		rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1285
		rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1286

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1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
		/*
		 * 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) {
1303 1304 1305 1306 1307 1308 1309
		/* ampdu_ack_len = 0 marks no BA was received. In this case
		 * 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
		 */
		if (info->status.ampdu_ack_len == 0)
			info->status.ampdu_len = 1;

1310
		rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
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1311
				   info->status.ampdu_len,
1312 1313
				   info->status.ampdu_ack_len,
				   reduced_txp);
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1314 1315

		/* Update success/fail counts if not searching for new mode */
1316
		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
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1317 1318 1319 1320 1321
			lq_sta->total_success += info->status.ampdu_ack_len;
			lq_sta->total_failed += (info->status.ampdu_len -
					info->status.ampdu_ack_len);
		}
	} else {
1322
		/* For legacy, update frame history with for each Tx retry. */
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1323 1324 1325 1326 1327 1328 1329 1330
		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) {
1331 1332 1333
			lq_hwrate = le32_to_cpu(table->rs_table[i]);
			rs_rate_from_ucode_rate(lq_hwrate, info->band,
						&lq_rate);
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1334 1335 1336 1337
			/*
			 * Only collect stats if retried rate is in the same RS
			 * table as active/search.
			 */
1338
			if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
J
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1339
				tmp_tbl = curr_tbl;
1340 1341
			else if (rs_rate_column_match(&lq_rate,
						      &other_tbl->rate))
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1342
				tmp_tbl = other_tbl;
1343
			else
J
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1344
				continue;
1345

1346 1347
			rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
					   1, i < retries ? 0 : legacy_success,
1348
					   reduced_txp);
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1349 1350 1351
		}

		/* Update success/fail counts if not searching for new mode */
1352
		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
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1353 1354 1355 1356 1357
			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 */
1358
	lq_sta->last_rate_n_flags = lq_hwrate;
1359
	IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
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1360 1361
done:
	/* See if there's a better rate or modulation mode to try. */
1362
	if (sta->supp_rates[info->band])
1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
		rs_rate_scale_perform(mvm, sta, lq_sta, tid);
}

/*
 * mac80211 sends us Tx status
 */
static void rs_mac80211_tx_status(void *mvm_r,
				  struct ieee80211_supported_band *sband,
				  struct ieee80211_sta *sta, void *priv_sta,
				  struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

1379 1380 1381
	if (!iwl_mvm_sta_from_mac80211(sta)->vif)
		return;

1382 1383 1384 1385 1386
	if (!ieee80211_is_data(hdr->frame_control) ||
	    info->flags & IEEE80211_TX_CTL_NO_ACK)
		return;

	iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
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1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399
}

/*
 * 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)
{
1400 1401
	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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1402
	if (is_legacy) {
1403 1404 1405
		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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Johannes Berg 已提交
1406
	} else {
1407 1408 1409
		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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1410 1411 1412 1413 1414
	}
	lq_sta->table_count = 0;
	lq_sta->total_failed = 0;
	lq_sta->total_success = 0;
	lq_sta->flush_timer = jiffies;
1415
	lq_sta->visited_columns = 0;
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1416 1417
}

1418 1419 1420 1421 1422 1423 1424
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;
}

1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441
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;
}

1442
static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1443 1444
					    const struct rs_tx_column *column,
					    u32 bw)
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1445 1446
{
	/* Used to choose among HT tables */
1447
	const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
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1448

1449 1450 1451 1452
	if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
			 column->mode != RS_SISO &&
			 column->mode != RS_MIMO2))
		return expected_tpt_legacy;
J
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1453 1454

	/* Legacy rates have only one table */
1455 1456
	if (column->mode == RS_LEGACY)
		return expected_tpt_legacy;
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1457

E
Eyal Shapira 已提交
1458
	ht_tbl_pointer = expected_tpt_mimo2_20MHz;
J
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1459
	/* Choose among many HT tables depending on number of streams
E
Eyal Shapira 已提交
1460
	 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
J
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1461
	 * status */
1462 1463
	if (column->mode == RS_SISO) {
		switch (bw) {
E
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1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475
		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;
		default:
			WARN_ON_ONCE(1);
		}
1476 1477
	} else if (column->mode == RS_MIMO2) {
		switch (bw) {
E
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1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491
		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;
		default:
			WARN_ON_ONCE(1);
		}
	} else {
		WARN_ON_ONCE(1);
1492
	}
J
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1493

1494 1495 1496 1497 1498 1499
	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];
J
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1500
	else						/* AGG+SGI */
1501 1502 1503 1504 1505 1506 1507 1508 1509 1510
		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);
J
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1511 1512 1513 1514 1515
}

static s32 rs_get_best_rate(struct iwl_mvm *mvm,
			    struct iwl_lq_sta *lq_sta,
			    struct iwl_scale_tbl_info *tbl,	/* "search" */
1516
			    unsigned long rate_mask, s8 index)
J
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1517 1518 1519
{
	struct iwl_scale_tbl_info *active_tbl =
	    &(lq_sta->lq_info[lq_sta->active_tbl]);
1520 1521
	s32 success_ratio = active_tbl->win[index].success_ratio;
	u16 expected_current_tpt = active_tbl->expected_tpt[index];
1522
	const u16 *tpt_tbl = tbl->expected_tpt;
J
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1523
	u16 high_low;
1524 1525
	u32 target_tpt;
	int rate_idx;
J
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1526

1527
	if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1528 1529 1530 1531 1532 1533 1534
		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,
1535
			       "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1536 1537
			       success_ratio, target_tpt);
	}
J
Johannes Berg 已提交
1538

1539
	rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
J
Johannes Berg 已提交
1540

1541 1542 1543
	while (rate_idx != IWL_RATE_INVALID) {
		if (target_tpt < (100 * tpt_tbl[rate_idx]))
			break;
J
Johannes Berg 已提交
1544

1545 1546
		high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
						tbl->rate.type);
J
Johannes Berg 已提交
1547

1548
		rate_idx = (high_low >> 8) & 0xff;
J
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1549 1550
	}

1551 1552 1553 1554 1555 1556
	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;
J
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1557 1558
}

1559
static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
E
Eyal Shapira 已提交
1560 1561
{
	if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1562
		return RATE_MCS_CHAN_WIDTH_80;
E
Eyal Shapira 已提交
1563
	else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1564 1565 1566
		return RATE_MCS_CHAN_WIDTH_40;

	return RATE_MCS_CHAN_WIDTH_20;
E
Eyal Shapira 已提交
1567 1568
}

J
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1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582
/*
 * 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;

1583
	mvm = lq_sta->pers.drv;
J
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1584 1585 1586 1587 1588
	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 */
1589
	if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
J
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1590 1591 1592 1593 1594
		/* Elapsed time using current modulation mode */
		if (lq_sta->flush_timer)
			flush_interval_passed =
				time_after(jiffies,
					   (unsigned long)(lq_sta->flush_timer +
1595
							   (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
J
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1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616

		/*
		 * 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 */
1617 1618 1619
			lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
			IWL_DEBUG_RATE(mvm,
				       "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
J
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1620 1621 1622
			lq_sta->total_failed = 0;
			lq_sta->total_success = 0;
			lq_sta->flush_timer = 0;
1623 1624
			/* mark the current column as visited */
			lq_sta->visited_columns = BIT(tbl->column);
J
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1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638
		/*
		 * 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");
1639
				rs_rate_scale_clear_tbl_windows(mvm, tbl);
J
Johannes Berg 已提交
1640 1641 1642 1643 1644 1645
			}
		}

		/* If transitioning to allow "search", reset all history
		 * bitmaps and stats in active table (this will become the new
		 * "search" table). */
1646
		if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1647
			rs_rate_scale_clear_tbl_windows(mvm, tbl);
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1648 1649 1650 1651 1652 1653 1654 1655
		}
	}
}

/*
 * setup rate table in uCode
 */
static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1656
			       struct ieee80211_sta *sta,
J
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1657
			       struct iwl_lq_sta *lq_sta,
1658
			       struct iwl_scale_tbl_info *tbl)
J
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1659
{
1660
	rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1661
	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
J
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1662 1663
}

1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708
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)
{
	if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
		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;
}

1709 1710 1711 1712 1713
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)
{
1714
	int i, j, max_rate;
1715 1716 1717 1718
	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;
1719
	u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1720
	const u16 *expected_tpt_tbl;
1721
	u16 tpt, max_expected_tpt;
1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745

	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];
1746 1747
			if (allow_func && !allow_func(mvm, sta, &tbl->rate,
						      next_col))
1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760
				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,
1761
						     rs_bw_from_sta_bw(sta));
1762 1763 1764
		if (WARN_ON_ONCE(!expected_tpt_tbl))
			continue;

1765
		max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1766 1767 1768 1769
		if (max_rate == IWL_RATE_INVALID) {
			IWL_DEBUG_RATE(mvm,
				       "Skip column %d: no rate is allowed in this column\n",
				       next_col_id);
1770
			continue;
1771
		}
1772

1773
		max_expected_tpt = expected_tpt_tbl[max_rate];
1774 1775 1776 1777 1778 1779 1780
		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;
		}

1781 1782 1783
		IWL_DEBUG_RATE(mvm,
			       "Found potential column %d. Max expected %d current %d\n",
			       next_col_id, max_expected_tpt, tpt);
1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805
		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)
{
	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
	struct iwl_scale_tbl_info *search_tbl =
				&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
	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];
	u32 sz = (sizeof(struct iwl_scale_tbl_info) -
		  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1806
	unsigned long rate_mask = 0;
1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819
	u32 rate_idx = 0;

	memcpy(search_tbl, tbl, sz);

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

	if (column->mode == RS_LEGACY) {
		if (lq_sta->band == IEEE80211_BAND_5GHZ)
			rate->type = LQ_LEGACY_A;
		else
			rate->type = LQ_LEGACY_G;

1820 1821
		rate->bw = RATE_MCS_CHAN_WIDTH_20;
		rate->ldpc = false;
1822 1823 1824 1825 1826 1827 1828 1829
		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 {
1830
		WARN_ONCE(1, "Bad column mode");
1831 1832
	}

1833 1834 1835 1836 1837
	if (column->mode != RS_LEGACY) {
		rate->bw = rs_bw_from_sta_bw(sta);
		rate->ldpc = lq_sta->ldpc;
	}

1838 1839 1840
	search_tbl->column = col_id;
	rs_set_expected_tpt_table(lq_sta, search_tbl);

1841 1842
	lq_sta->visited_columns |= BIT(col_id);

1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853
	/* 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"
1854
				       " rate mask %lx\n",
1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872
				       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;
}

1873 1874 1875 1876 1877 1878 1879 1880
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;

1881 1882
	if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
	    (current_tpt == 0)) {
1883
		IWL_DEBUG_RATE(mvm,
1884 1885
			       "Decrease rate because of low SR\n");
		return RS_ACTION_DOWNSCALE;
1886 1887
	}

1888 1889 1890
	if ((low_tpt == IWL_INVALID_VALUE) &&
	    (high_tpt == IWL_INVALID_VALUE) &&
	    (high != IWL_RATE_INVALID)) {
1891
		IWL_DEBUG_RATE(mvm,
1892 1893
			       "No data about high/low rates. Increase rate\n");
		return RS_ACTION_UPSCALE;
1894 1895
	}

1896 1897 1898 1899 1900 1901 1902 1903
	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;
	}
1904

1905 1906 1907 1908 1909
	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;
1910 1911
	}

1912 1913 1914 1915
	if ((low_tpt != IWL_INVALID_VALUE) &&
	    (high_tpt != IWL_INVALID_VALUE) &&
	    (low_tpt < current_tpt) &&
	    (high_tpt < current_tpt)) {
1916
		IWL_DEBUG_RATE(mvm,
1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930
			       "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)) {
1931
		IWL_DEBUG_RATE(mvm,
1932 1933 1934 1935 1936 1937 1938 1939 1940
			       "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)) {
1941
		if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
			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");
		}
1952 1953 1954 1955
	}

	return action;
}
1956

1957 1958 1959 1960 1961 1962
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
	 */
1963
	if (!lq_sta->stbc_capable)
1964 1965 1966 1967 1968 1969 1970 1971
		return false;

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

	return true;
}

1972 1973 1974
static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
				int *weaker, int *stronger)
{
1975
	*weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1976 1977 1978
	if (*weaker > TPC_MAX_REDUCTION)
		*weaker = TPC_INVALID;

1979
	*stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1980 1981 1982 1983
	if (*stronger < 0)
		*stronger = TPC_INVALID;
}

1984 1985
static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			   struct rs_rate *rate, enum ieee80211_band band)
1986 1987
{
	int index = rate->index;
1988 1989 1990
	bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
	bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
				!vif->bss_conf.ps);
1991

1992 1993
	IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
		       cam, sta_ps_disabled);
1994 1995 1996 1997
	/*
	 * allow tpc only if power management is enabled, or bt coex
	 * activity grade allows it and we are on 2.4Ghz.
	 */
1998
	if ((cam || sta_ps_disabled) &&
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034
	    !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))
		return index == IWL_RATE_MCS_7_INDEX ||
		       index == IWL_RATE_MCS_8_INDEX ||
		       index == IWL_RATE_MCS_9_INDEX;

	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 */
2035 2036
	if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
	    current_tpt == 0) {
2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058
		IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
		return TPC_ACTION_NO_RESTIRCTION;
	}

	/* try decreasing first if applicable */
	if (weak != TPC_INVALID) {
		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 */
2059 2060
	if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
	    strong != TPC_INVALID) {
2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086
		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)
{
2087
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099
	struct ieee80211_vif *vif = mvm_sta->vif;
	struct ieee80211_chanctx_conf *chanctx_conf;
	enum ieee80211_band band;
	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;

2100
#ifdef CONFIG_MAC80211_DEBUGFS
2101
	if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2102
		IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2103 2104 2105
			       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;
2106 2107 2108
	}
#endif

2109 2110 2111 2112 2113 2114 2115 2116
	rcu_read_lock();
	chanctx_conf = rcu_dereference(vif->chanctx_conf);
	if (WARN_ON(!chanctx_conf))
		band = IEEE80211_NUM_BANDS;
	else
		band = chanctx_conf->def.chan->band;
	rcu_read_unlock();

2117
	if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2118
		IWL_DEBUG_RATE(mvm,
2119
			       "tpc is not allowed. remove txp restrictions\n");
2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144
		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) {
2145
		IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2146 2147 2148 2149
		action = TPC_ACTION_STAY;
	} else if (strong == TPC_INVALID &&
		   (action == TPC_ACTION_INCREASE ||
		    action == TPC_ACTION_NO_RESTIRCTION)) {
2150
		IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170
		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
2171 2172 2173 2174 2175
/*
 * Do rate scaling and search for new modulation mode.
 */
static void rs_rate_scale_perform(struct iwl_mvm *mvm,
				  struct ieee80211_sta *sta,
2176 2177
				  struct iwl_lq_sta *lq_sta,
				  int tid)
J
Johannes Berg 已提交
2178 2179 2180 2181 2182 2183 2184 2185 2186
{
	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;
2187
	enum rs_action scale_action = RS_ACTION_STAY;
J
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2188 2189 2190 2191 2192 2193 2194
	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;
2195
	u8 prev_agg = lq_sta->is_agg;
2196
	struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
J
Johannes Berg 已提交
2197
	struct iwl_mvm_tid_data *tid_data;
2198
	struct rs_rate *rate;
J
Johannes Berg 已提交
2199

2200
	lq_sta->is_agg = !!sta_priv->agg_tids;
J
Johannes Berg 已提交
2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212

	/*
	 * 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
		active_tbl = 1 - lq_sta->active_tbl;

	tbl = &(lq_sta->lq_info[active_tbl]);
2213
	rate = &tbl->rate;
J
Johannes Berg 已提交
2214

2215 2216 2217 2218 2219
	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);
2220
		rs_rate_scale_clear_tbl_windows(mvm, tbl);
2221 2222
	}

J
Johannes Berg 已提交
2223
	/* current tx rate */
2224
	index = rate->index;
J
Johannes Berg 已提交
2225 2226

	/* rates available for this association, and for modulation mode */
2227
	rate_mask = rs_get_supported_rates(lq_sta, rate);
J
Johannes Berg 已提交
2228

2229
	if (!(BIT(index) & rate_mask)) {
J
Johannes Berg 已提交
2230 2231 2232
		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*/
2233
			rate->type = LQ_NONE;
J
Johannes Berg 已提交
2234 2235
			lq_sta->search_better_tbl = 0;
			tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2236
			rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
J
Johannes Berg 已提交
2237 2238 2239 2240 2241 2242 2243 2244 2245 2246
		}
		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;
	}

2247
	/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
J
Johannes Berg 已提交
2248 2249 2250 2251 2252 2253 2254 2255 2256 2257
	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;
2258 2259
	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
2260
		IWL_DEBUG_RATE(mvm,
2261 2262 2263
			       "%s: Test Window: succ %d total %d\n",
			       rs_pretty_rate(rate),
			       window->success_counter, window->counter);
J
Johannes Berg 已提交
2264 2265 2266 2267 2268 2269 2270 2271

		/* 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);

2272
		return;
J
Johannes Berg 已提交
2273 2274 2275 2276 2277 2278 2279 2280 2281
	}

	/* 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,
2282 2283
				       "SWITCHING TO NEW TABLE SR: %d "
				       "cur-tpt %d old-tpt %d\n",
J
Johannes Berg 已提交
2284 2285 2286 2287 2288 2289 2290 2291 2292 2293
				       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,
2294 2295
				       "GOING BACK TO THE OLD TABLE: SR %d "
				       "cur-tpt %d old-tpt %d\n",
J
Johannes Berg 已提交
2296 2297 2298 2299 2300
				       window->success_ratio,
				       window->average_tpt,
				       lq_sta->last_tpt);

			/* Nullify "search" table */
2301
			rate->type = LQ_NONE;
J
Johannes Berg 已提交
2302 2303 2304 2305 2306 2307

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

			/* Revert to "active" rate and throughput info */
2308
			index = tbl->rate.index;
J
Johannes Berg 已提交
2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323
			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. */
2324
	high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
J
Johannes Berg 已提交
2325 2326 2327
	low = high_low & 0xff;
	high = (high_low >> 8) & 0xff;

2328
	/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
J
Johannes Berg 已提交
2329 2330 2331 2332 2333 2334 2335 2336 2337 2338

	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;

2339
	IWL_DEBUG_RATE(mvm,
2340 2341
		       "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
		       rs_pretty_rate(rate), current_tpt, sr,
2342
		       low, high, low_tpt, high_tpt);
2343

2344 2345
	scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
					  current_tpt, low_tpt, high_tpt);
J
Johannes Berg 已提交
2346

2347
	/* Force a search in case BT doesn't like us being in MIMO */
2348
	if (is_mimo(rate) &&
2349
	    !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2350 2351
		IWL_DEBUG_RATE(mvm,
			       "BT Coex forbids MIMO. Search for new config\n");
2352 2353 2354 2355
		rs_stay_in_table(lq_sta, true);
		goto lq_update;
	}

J
Johannes Berg 已提交
2356
	switch (scale_action) {
2357
	case RS_ACTION_DOWNSCALE:
J
Johannes Berg 已提交
2358 2359 2360 2361
		/* Decrease starting rate, update uCode's rate table */
		if (low != IWL_RATE_INVALID) {
			update_lq = 1;
			index = low;
2362 2363 2364
		} else {
			IWL_DEBUG_RATE(mvm,
				       "At the bottom rate. Can't decrease\n");
J
Johannes Berg 已提交
2365 2366 2367
		}

		break;
2368
	case RS_ACTION_UPSCALE:
J
Johannes Berg 已提交
2369 2370 2371 2372
		/* Increase starting rate, update uCode's rate table */
		if (high != IWL_RATE_INVALID) {
			update_lq = 1;
			index = high;
2373 2374 2375
		} else {
			IWL_DEBUG_RATE(mvm,
				       "At the top rate. Can't increase\n");
J
Johannes Berg 已提交
2376 2377 2378
		}

		break;
2379
	case RS_ACTION_STAY:
J
Johannes Berg 已提交
2380
		/* No change */
2381 2382
		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
			update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2383
		break;
J
Johannes Berg 已提交
2384 2385 2386 2387 2388 2389
	default:
		break;
	}

lq_update:
	/* Replace uCode's rate table for the destination station. */
2390 2391
	if (update_lq) {
		tbl->rate.index = index;
2392 2393
		if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
			rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2394
		rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2395
	}
J
Johannes Berg 已提交
2396 2397 2398 2399 2400 2401 2402 2403 2404 2405

	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 &&
2406 2407 2408 2409
	    lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
	    && window->counter) {
		enum rs_column next_column;

J
Johannes Berg 已提交
2410 2411 2412
		/* Save current throughput to compare with "search" throughput*/
		lq_sta->last_tpt = current_tpt;

2413
		IWL_DEBUG_RATE(mvm,
2414 2415
			       "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
			       update_lq, done_search, lq_sta->rs_state,
2416
			       window->counter);
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428

		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
2429 2430 2431 2432 2433

		/* If new "search" mode was selected, set up in uCode table */
		if (lq_sta->search_better_tbl) {
			/* Access the "search" table, clear its history. */
			tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2434
			rs_rate_scale_clear_tbl_windows(mvm, tbl);
J
Johannes Berg 已提交
2435 2436

			/* Use new "search" start rate */
2437
			index = tbl->rate.index;
J
Johannes Berg 已提交
2438

2439 2440
			rs_dump_rate(mvm, &tbl->rate,
				     "Switch to SEARCH TABLE:");
2441
			rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
J
Johannes Berg 已提交
2442 2443 2444 2445 2446
		} else {
			done_search = 1;
		}
	}

2447
	if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
J
Johannes Berg 已提交
2448 2449 2450 2451 2452 2453
		/* If the "active" (non-search) mode was legacy,
		 * and we've tried switching antennas,
		 * but we haven't been able to try HT modes (not available),
		 * stay with best antenna legacy modulation for a while
		 * before next round of mode comparisons. */
		tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2454
		if (is_legacy(&tbl1->rate)) {
J
Johannes Berg 已提交
2455
			IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2456 2457 2458 2459 2460 2461 2462 2463 2464 2465

			if (tid != IWL_MAX_TID_COUNT) {
				tid_data = &sta_priv->tid_data[tid];
				if (tid_data->state != IWL_AGG_OFF) {
					IWL_DEBUG_RATE(mvm,
						       "Stop aggregation on tid %d\n",
						       tid);
					ieee80211_stop_tx_ba_session(sta, tid);
				}
			}
J
Johannes Berg 已提交
2466
			rs_set_stay_in_table(mvm, 1, lq_sta);
2467
		} else {
J
Johannes Berg 已提交
2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487
		/* If we're in an HT mode, and all 3 mode switch actions
		 * have been tried and compared, stay in this best modulation
		 * mode for a while before next round of mode comparisons. */
			if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
			    (lq_sta->tx_agg_tid_en & (1 << tid)) &&
			    (tid != IWL_MAX_TID_COUNT)) {
				tid_data = &sta_priv->tid_data[tid];
				if (tid_data->state == IWL_AGG_OFF) {
					IWL_DEBUG_RATE(mvm,
						       "try to aggregate tid %d\n",
						       tid);
					rs_tl_turn_on_agg(mvm, tid,
							  lq_sta, sta);
				}
			}
			rs_set_stay_in_table(mvm, 0, lq_sta);
		}
	}
}

2488 2489 2490 2491 2492
struct rs_init_rate_info {
	s8 rssi;
	u8 rate_idx;
};

2493
static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505
	{ -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 },
};

2506
static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2507 2508 2509 2510 2511 2512 2513 2514 2515 2516
	{ -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 },
};

2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552
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},
};

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},
};

static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = {
	{ -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 },
};

2553 2554
#define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */

2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635
/* 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;
	else if (lq_sta->band == IEEE80211_BAND_5GHZ)
		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;

		if (lq_sta->band == IEEE80211_BAND_5GHZ) {
			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 {
			lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz;
			lq_sta->optimal_nentries =
				ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
		}
	} 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;
}

2636 2637 2638 2639
/* 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,
2640
				struct ieee80211_sta *sta,
2641 2642 2643 2644 2645
				struct iwl_lq_sta *lq_sta,
				enum ieee80211_band band,
				struct rs_rate *rate)
{
	int i, nentries;
2646
	unsigned long active_rate;
2647 2648
	s8 best_rssi = S8_MIN;
	u8 best_ant = ANT_NONE;
2649
	u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678
	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",
		       rs_pretty_ant(best_ant), best_rssi);

	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);

	if (band == IEEE80211_BAND_5GHZ) {
		rate->type = LQ_LEGACY_A;
2679 2680
		initial_rates = rs_optimal_rates_5ghz_legacy;
		nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2681 2682
	} else {
		rate->type = LQ_LEGACY_G;
2683 2684
		initial_rates = rs_optimal_rates_24ghz_legacy;
		nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2685 2686
	}

2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710
	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.
	 */
	if (sta->vht_cap.vht_supported &&
	    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
		if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) {
			initial_rates = rs_optimal_rates_vht_40_80mhz;
			nentries = ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
			if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
				rate->bw = RATE_MCS_CHAN_WIDTH_80;
			else
				rate->bw = RATE_MCS_CHAN_WIDTH_40;
		} else if (sta->bandwidth == IEEE80211_STA_RX_BW_20) {
			initial_rates = rs_optimal_rates_vht_20mhz;
			nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
			rate->bw = RATE_MCS_CHAN_WIDTH_20;
		} else {
			IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
			goto out;
2711
		}
2712 2713 2714 2715 2716 2717 2718 2719 2720 2721
		active_rate = lq_sta->active_siso_rate;
		rate->type = LQ_VHT_SISO;
	} else if (sta->ht_cap.ht_supported &&
		   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;
2722 2723
	}

2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735
	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");
2736 2737 2738 2739 2740 2741 2742
}

/* Save info about RSSI of last Rx */
void rs_update_last_rssi(struct iwl_mvm *mvm,
			 struct iwl_lq_sta *lq_sta,
			 struct ieee80211_rx_status *rx_status)
{
2743 2744
	int i;

2745 2746 2747 2748
	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];
	lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2749 2750 2751 2752 2753 2754 2755 2756 2757
	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];
	}
2758 2759
}

J
Johannes Berg 已提交
2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776
/**
 * 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,
2777 2778
			     enum ieee80211_band band,
			     bool init)
J
Johannes Berg 已提交
2779 2780
{
	struct iwl_scale_tbl_info *tbl;
2781
	struct rs_rate *rate;
J
Johannes Berg 已提交
2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792
	u8 active_tbl = 0;

	if (!sta || !lq_sta)
		return;

	if (!lq_sta->search_better_tbl)
		active_tbl = lq_sta->active_tbl;
	else
		active_tbl = 1 - lq_sta->active_tbl;

	tbl = &(lq_sta->lq_info[active_tbl]);
2793
	rate = &tbl->rate;
J
Johannes Berg 已提交
2794

2795
	rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2796
	rs_init_optimal_rate(mvm, sta, lq_sta);
J
Johannes Berg 已提交
2797

2798
	WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2799
	tbl->column = rs_get_column_from_rate(rate);
2800

J
Johannes Berg 已提交
2801
	rs_set_expected_tpt_table(lq_sta, tbl);
2802
	rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
J
Johannes Berg 已提交
2803
	/* TODO restore station should remember the lq cmd */
2804
	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
J
Johannes Berg 已提交
2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815
}

static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
			struct ieee80211_tx_rate_control *txrc)
{
	struct sk_buff *skb = txrc->skb;
	struct iwl_op_mode *op_mode __maybe_unused =
			(struct iwl_op_mode *)mvm_r;
	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct iwl_lq_sta *lq_sta = mvm_sta;
2816 2817
	struct rs_rate *optimal_rate;
	u32 last_ucode_rate;
J
Johannes Berg 已提交
2818

2819 2820 2821 2822 2823 2824 2825 2826
	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;
	}

2827
	/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
J
Johannes Berg 已提交
2828 2829

	/* Treat uninitialized rate scaling data same as non-existing. */
2830
	if (lq_sta && !lq_sta->pers.drv) {
J
Johannes Berg 已提交
2831 2832 2833 2834 2835 2836 2837 2838
		IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
		mvm_sta = NULL;
	}

	/* Send management frames and NO_ACK data using lowest rate. */
	if (rate_control_send_low(sta, mvm_sta, txrc))
		return;

E
Eyal Shapira 已提交
2839 2840
	iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
				  info->band, &info->control.rates[0]);
2841
	info->control.rates[0].count = 1;
2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852

	/* 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);
		iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
					  &txrc->reported_rate);
	}
J
Johannes Berg 已提交
2853 2854 2855 2856 2857
}

static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
			  gfp_t gfp)
{
2858
	struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2859 2860 2861
	struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
	struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
	struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
J
Johannes Berg 已提交
2862 2863 2864

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

2865 2866 2867 2868
	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;
2869
	lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2870
#endif
2871 2872
	lq_sta->pers.chains = 0;
	memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2873
	lq_sta->pers.last_rssi = S8_MIN;
2874

J
Johannes Berg 已提交
2875 2876 2877
	return &sta_priv->lq_sta;
}

E
Eyal Shapira 已提交
2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895
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;
}

2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907
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;

2908 2909 2910 2911 2912
			/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
			if (i == IWL_RATE_MCS_9_INDEX &&
			    sta->bandwidth == IEEE80211_STA_RX_BW_20)
				continue;

2913 2914 2915 2916
			lq_sta->active_siso_rate |= BIT(i);
		}
	}

2917 2918 2919
	if (sta->rx_nss < 2)
		return;

2920 2921 2922 2923 2924 2925
	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;

2926 2927 2928 2929 2930
			/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
			if (i == IWL_RATE_MCS_9_INDEX &&
			    sta->bandwidth == IEEE80211_STA_RX_BW_20)
				continue;

2931 2932 2933 2934 2935
			lq_sta->active_mimo2_rate |= BIT(i);
		}
	}
}

2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961
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))
2962
		lq_sta->stbc_capable = true;
2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980

	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))
2981 2982
		lq_sta->stbc_capable = true;

2983
	if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2984 2985 2986
	    (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;
2987 2988 2989 2990

	lq_sta->is_vht = true;
}

2991
#ifdef CONFIG_IWLWIFI_DEBUGFS
2992
static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2993 2994
{
	spin_lock_bh(&mvm->drv_stats_lock);
2995
	memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2996 2997 2998
	spin_unlock_bh(&mvm->drv_stats_lock);
}

2999
void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3000 3001 3002 3003 3004 3005
{
	u8 nss = 0, mcs = 0;

	spin_lock(&mvm->drv_stats_lock);

	if (agg)
3006
		mvm->drv_rx_stats.agg_frames++;
3007

3008
	mvm->drv_rx_stats.success_frames++;
3009 3010 3011

	switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
	case RATE_MCS_CHAN_WIDTH_20:
3012
		mvm->drv_rx_stats.bw_20_frames++;
3013 3014
		break;
	case RATE_MCS_CHAN_WIDTH_40:
3015
		mvm->drv_rx_stats.bw_40_frames++;
3016 3017
		break;
	case RATE_MCS_CHAN_WIDTH_80:
3018
		mvm->drv_rx_stats.bw_80_frames++;
3019 3020 3021 3022 3023 3024
		break;
	default:
		WARN_ONCE(1, "bad BW. rate 0x%x", rate);
	}

	if (rate & RATE_MCS_HT_MSK) {
3025
		mvm->drv_rx_stats.ht_frames++;
3026 3027 3028
		mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
		nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
	} else if (rate & RATE_MCS_VHT_MSK) {
3029
		mvm->drv_rx_stats.vht_frames++;
3030 3031 3032 3033
		mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
		nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
		       RATE_VHT_MCS_NSS_POS) + 1;
	} else {
3034
		mvm->drv_rx_stats.legacy_frames++;
3035 3036 3037
	}

	if (nss == 1)
3038
		mvm->drv_rx_stats.siso_frames++;
3039
	else if (nss == 2)
3040
		mvm->drv_rx_stats.mimo2_frames++;
3041 3042

	if (rate & RATE_MCS_SGI_MSK)
3043
		mvm->drv_rx_stats.sgi_frames++;
3044
	else
3045
		mvm->drv_rx_stats.ngi_frames++;
3046

3047 3048 3049 3050
	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);
3051 3052 3053 3054 3055

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

J
Johannes Berg 已提交
3056 3057 3058 3059
/*
 * Called after adding a new station to initialize rate scaling
 */
void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3060
			  enum ieee80211_band band, bool init)
J
Johannes Berg 已提交
3061 3062 3063 3064
{
	int i, j;
	struct ieee80211_hw *hw = mvm->hw;
	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
E
Eyal Shapira 已提交
3065
	struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3066 3067
	struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
	struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
J
Johannes Berg 已提交
3068 3069 3070
	struct ieee80211_supported_band *sband;
	unsigned long supp; /* must be unsigned long for for_each_set_bit */

3071 3072
	/* clear all non-persistent lq data */
	memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3073

J
Johannes Berg 已提交
3074 3075 3076 3077 3078
	sband = hw->wiphy->bands[band];

	lq_sta->lq.sta_id = sta_priv->sta_id;

	for (j = 0; j < LQ_SIZE; j++)
3079
		rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
J
Johannes Berg 已提交
3080 3081

	lq_sta->flush_timer = 0;
3082
	lq_sta->last_tx = jiffies;
J
Johannes Berg 已提交
3083 3084 3085 3086 3087 3088 3089 3090 3091

	IWL_DEBUG_RATE(mvm,
		       "LQ: *** rate scale station global init for station %d ***\n",
		       sta_priv->sta_id);
	/* 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.. */

3092
	lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
J
Johannes Berg 已提交
3093 3094 3095 3096 3097 3098 3099 3100 3101
	lq_sta->band = sband->band;
	/*
	 * active legacy rates as per supported rates bitmap
	 */
	supp = sta->supp_rates[sband->band];
	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
3102
	/* TODO: should probably account for rx_highest for both HT/VHT */
3103 3104 3105 3106
	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
3107

3108 3109 3110 3111 3112 3113
	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);
3114

E
Eyal Shapira 已提交
3115
	IWL_DEBUG_RATE(mvm,
3116
		       "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3117
		       lq_sta->active_legacy_rate,
J
Johannes Berg 已提交
3118
		       lq_sta->active_siso_rate,
E
Eyal Shapira 已提交
3119
		       lq_sta->active_mimo2_rate,
3120 3121
		       lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
		       lq_sta->bfer_capable);
3122 3123 3124 3125
	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
3126 3127 3128

	/* These values will be overridden later */
	lq_sta->lq.single_stream_ant_msk =
3129
		first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3130
	lq_sta->lq.dual_stream_ant_msk = ANT_AB;
J
Johannes Berg 已提交
3131 3132 3133 3134

	/* as default allow aggregation for all tids */
	lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
	lq_sta->is_agg = 0;
3135
#ifdef CONFIG_IWLWIFI_DEBUGFS
3136
	iwl_mvm_reset_frame_stats(mvm);
3137
#endif
3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151
	rs_initialize_lq(mvm, sta, lq_sta, band, init);
}

static void rs_rate_update(void *mvm_r,
			   struct ieee80211_supported_band *sband,
			   struct cfg80211_chan_def *chandef,
			   struct ieee80211_sta *sta, void *priv_sta,
			   u32 changed)
{
	u8 tid;
	struct iwl_op_mode *op_mode  =
			(struct iwl_op_mode *)mvm_r;
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);

3152 3153 3154
	if (!iwl_mvm_sta_from_mac80211(sta)->vif)
		return;

3155 3156 3157 3158 3159
	/* 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);

	iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
J
Johannes Berg 已提交
3160 3161
}

3162 3163 3164 3165 3166 3167 3168 3169 3170 3171
#ifdef CONFIG_MAC80211_DEBUGFS
static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
					    struct iwl_lq_cmd *lq_cmd,
					    enum ieee80211_band band,
					    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);
3172
	u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3173 3174 3175 3176 3177 3178 3179 3180 3181 3182

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

	rs_rate_from_ucode_rate(ucode_rate, band, &rate);

	if (is_mimo(&rate))
		lq_cmd->mimo_delim = num_rates - 1;
	else
		lq_cmd->mimo_delim = 0;
3183 3184 3185 3186 3187 3188 3189

	lq_cmd->reduced_tpc = 0;

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

	lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3190 3191 3192
}
#endif /* CONFIG_MAC80211_DEBUGFS */

3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207
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++) {
3208 3209 3210
		for (j = 0; j < num_retries && index < end; j++, index++) {
			ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
									 rate));
3211
			rs_table[index] = ucode_rate;
3212 3213 3214
			if (toggle_ant)
				rs_toggle_antenna(valid_tx_ant, rate);
		}
3215 3216 3217 3218 3219 3220 3221

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

3222
	if (!bottom_reached && !is_legacy(rate))
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
		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:
 *
 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
 * 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
 */
3248
static void rs_build_rates_table(struct iwl_mvm *mvm,
3249
				 struct ieee80211_sta *sta,
3250 3251
				 struct iwl_lq_sta *lq_sta,
				 const struct rs_rate *initial_rate)
J
Johannes Berg 已提交
3252
{
3253
	struct rs_rate rate;
3254
	int num_rates, num_retries, index = 0;
J
Johannes Berg 已提交
3255 3256
	u8 valid_tx_ant = 0;
	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3257
	bool toggle_ant = false;
J
Johannes Berg 已提交
3258

3259
	memcpy(&rate, initial_rate, sizeof(rate));
3260

3261
	valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3262

3263
	/* TODO: remove old API when min FW API hits 14 */
3264
	if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3265 3266
	    rs_stbc_allow(mvm, sta, lq_sta))
		rate.stbc = true;
J
Johannes Berg 已提交
3267

3268
	if (is_siso(&rate)) {
3269 3270
		num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
		num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3271
	} else if (is_mimo(&rate)) {
3272 3273
		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
3274
	} else {
3275
		num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3276
		num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3277
		toggle_ant = true;
J
Johannes Berg 已提交
3278 3279
	}

3280 3281 3282
	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
3283

3284
	rs_get_lower_rate_down_column(lq_sta, &rate);
J
Johannes Berg 已提交
3285

3286
	if (is_siso(&rate)) {
3287 3288
		num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
		num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3289
		lq_cmd->mimo_delim = index;
3290
	} else if (is_legacy(&rate)) {
3291
		num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3292
		num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3293 3294 3295
	} else {
		WARN_ON_ONCE(1);
	}
J
Johannes Berg 已提交
3296

3297
	toggle_ant = true;
J
Johannes Berg 已提交
3298

3299 3300 3301
	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
3302

3303
	rs_get_lower_rate_down_column(lq_sta, &rate);
J
Johannes Berg 已提交
3304

3305
	num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3306
	num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
J
Johannes Berg 已提交
3307

3308 3309 3310
	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
3311

3312 3313
}

3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392
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);
	struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
	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;

3393
#ifdef CONFIG_MAC80211_DEBUGFS
3394 3395 3396
	/* Check if forcing the decision is configured.
	 * Note that SISO is forced by not allowing STBC or BFER
	 */
3397
	if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3398
		ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3399
	else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3400 3401
		ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);

3402
	if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3403
		IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3404
			       lq_sta->pers.ss_force);
3405 3406
		goto out;
	}
3407
#endif
3408

3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451
	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) {
		struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
		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);
		iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);

		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);
}

3452 3453 3454 3455 3456 3457
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;
3458 3459 3460
	struct iwl_mvm_sta *mvmsta;
	struct iwl_mvm_vif *mvmvif;

3461
	lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3462
	lq_cmd->agg_time_limit =
3463
		cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3464 3465

#ifdef CONFIG_MAC80211_DEBUGFS
3466
	if (lq_sta->pers.dbg_fixed_rate) {
3467 3468
		rs_build_rates_table_from_fixed(mvm, lq_cmd,
						lq_sta->band,
3469
						lq_sta->pers.dbg_fixed_rate);
3470 3471
		return;
	}
3472
#endif
3473 3474
	if (WARN_ON_ONCE(!sta || !initial_rate))
		return;
3475

3476
	rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
J
Johannes Berg 已提交
3477

3478
	if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3479 3480
		rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);

3481 3482
	mvmsta = iwl_mvm_sta_from_mac80211(sta);
	mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3483

3484 3485 3486 3487 3488 3489
	if (num_of_ant(initial_rate->ant) == 1)
		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
3490
	 * In case of low latency, tell the firmware to leave a frame in the
3491 3492 3493
	 * Tx Fifo so that it can start a transaction in the same TxOP. This
	 * basically allows the firmware to send bursts.
	 */
3494
	if (iwl_mvm_vif_low_latency(mvmvif))
3495 3496
		lq_cmd->agg_frame_cnt_limit--;

3497 3498 3499
	if (mvmsta->vif->p2p)
		lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;

3500
	lq_cmd->agg_time_limit =
3501
			cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
J
Johannes Berg 已提交
3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524
}

static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
{
	return hw->priv;
}
/* rate scale requires free function to be implemented */
static void rs_free(void *mvm_rate)
{
	return;
}

static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
			void *mvm_sta)
{
	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");
}

#ifdef CONFIG_MAC80211_DEBUGFS
3525
int rs_pretty_print_rate(char *buf, const u32 rate)
3526 3527
{

3528 3529 3530 3531 3532 3533 3534 3535 3536
	char *type, *bw;
	u8 mcs = 0, nss = 0;
	u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;

	if (!(rate & RATE_MCS_HT_MSK) &&
	    !(rate & RATE_MCS_VHT_MSK)) {
		int index = iwl_hwrate_to_plcp_idx(rate);

		return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3537 3538 3539
			       rs_pretty_ant(ant),
			       index == IWL_RATE_INVALID ? "BAD" :
			       iwl_rate_mcs[index].mbps);
3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571
	}

	if (rate & RATE_MCS_VHT_MSK) {
		type = "VHT";
		mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
		nss = ((rate & RATE_VHT_MCS_NSS_MSK)
		       >> RATE_VHT_MCS_NSS_POS) + 1;
	} else if (rate & RATE_MCS_HT_MSK) {
		type = "HT";
		mcs = rate & RATE_HT_MCS_INDEX_MSK;
	} else {
		type = "Unknown"; /* shouldn't happen */
	}

	switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
	case RATE_MCS_CHAN_WIDTH_20:
		bw = "20Mhz";
		break;
	case RATE_MCS_CHAN_WIDTH_40:
		bw = "40Mhz";
		break;
	case RATE_MCS_CHAN_WIDTH_80:
		bw = "80Mhz";
		break;
	case RATE_MCS_CHAN_WIDTH_160:
		bw = "160Mhz";
		break;
	default:
		bw = "BAD BW";
	}

	return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3572
		       type, rs_pretty_ant(ant), bw, mcs, nss,
3573
		       (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3574
		       (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3575 3576 3577 3578 3579
		       (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
		       (rate & RATE_MCS_BF_MSK) ? "BF " : "",
		       (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
}

3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593
/**
 * 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",
3594
		       lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3595

3596
	if (lq_sta->pers.dbg_fixed_rate) {
3597
		rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3598
		iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3599 3600 3601
	}
}

3602 3603 3604 3605 3606 3607 3608 3609 3610
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;

3611
	mvm = lq_sta->pers.drv;
3612 3613 3614 3615 3616 3617
	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)
3618
		lq_sta->pers.dbg_fixed_rate = parsed_rate;
3619
	else
3620
		lq_sta->pers.dbg_fixed_rate = 0;
3621 3622 3623 3624 3625 3626

	rs_program_fix_rate(mvm, lq_sta);

	return count;
}

J
Johannes Berg 已提交
3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637
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;

	struct iwl_lq_sta *lq_sta = file->private_data;
	struct iwl_mvm *mvm;
	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3638
	struct rs_rate *rate = &tbl->rate;
3639
	u32 ss_params;
3640
	mvm = lq_sta->pers.drv;
3641
	buff = kmalloc(2048, GFP_KERNEL);
J
Johannes Berg 已提交
3642 3643 3644 3645
	if (!buff)
		return -ENOMEM;

	desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3646
	desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
J
Johannes Berg 已提交
3647 3648 3649
			lq_sta->total_failed, lq_sta->total_success,
			lq_sta->active_legacy_rate);
	desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3650
			lq_sta->pers.dbg_fixed_rate);
J
Johannes Berg 已提交
3651
	desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3652 3653 3654
	    (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
	    (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
	    (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
J
Johannes Berg 已提交
3655
	desc += sprintf(buff+desc, "lq type %s\n",
3656 3657 3658
			(is_legacy(rate)) ? "legacy" :
			is_vht(rate) ? "VHT" : "HT");
	if (!is_legacy(rate)) {
3659
		desc += sprintf(buff + desc, " %s",
3660
		   (is_siso(rate)) ? "SISO" : "MIMO2");
3661 3662 3663 3664 3665 3666 3667 3668
		desc += sprintf(buff + desc, " %s",
				(is_ht20(rate)) ? "20MHz" :
				(is_ht40(rate)) ? "40MHz" :
				(is_ht80(rate)) ? "80Mhz" : "BAD BW");
		desc += sprintf(buff + desc, " %s %s %s\n",
				(rate->sgi) ? "SGI" : "NGI",
				(rate->ldpc) ? "LDPC" : "BCC",
				(lq_sta->is_agg) ? "AGG on" : "");
J
Johannes Berg 已提交
3669 3670 3671 3672
	}
	desc += sprintf(buff+desc, "last tx rate=0x%X\n",
			lq_sta->last_rate_n_flags);
	desc += sprintf(buff+desc,
3673
			"general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
J
Johannes Berg 已提交
3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684
			lq_sta->lq.flags,
			lq_sta->lq.mimo_delim,
			lq_sta->lq.single_stream_ant_msk,
			lq_sta->lq.dual_stream_ant_msk);

	desc += sprintf(buff+desc,
			"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);

3685
	desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3686 3687 3688
	ss_params = le32_to_cpu(lq_sta->lq.ss_params);
	desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
			(ss_params & LQ_SS_PARAMS_VALID) ?
3689
			"VALID" : "INVALID",
3690
			(ss_params & LQ_SS_BFER_ALLOWED) ?
3691
			", BFER" : "",
3692
			(ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3693
			", STBC" : "",
3694
			(ss_params & LQ_SS_FORCE) ?
3695
			", FORCE" : "");
J
Johannes Berg 已提交
3696 3697 3698 3699 3700 3701 3702 3703
	desc += sprintf(buff+desc,
			"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++) {
3704
		u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3705

3706 3707
		desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
		desc += rs_pretty_print_rate(buff+desc, r);
J
Johannes Berg 已提交
3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727
	}

	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;
E
Eyal Shapira 已提交
3728
	struct iwl_scale_tbl_info *tbl;
3729
	struct rs_rate *rate;
J
Johannes Berg 已提交
3730 3731 3732 3733 3734 3735 3736
	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++) {
E
Eyal Shapira 已提交
3737
		tbl = &(lq_sta->lq_info[i]);
3738
		rate = &tbl->rate;
J
Johannes Berg 已提交
3739
		desc += sprintf(buff+desc,
3740
				"%s type=%d SGI=%d BW=%s DUP=0\n"
3741
				"index=%d\n",
J
Johannes Berg 已提交
3742
				lq_sta->active_tbl == i ? "*" : "x",
3743 3744 3745 3746 3747
				rate->type,
				rate->sgi,
				is_ht20(rate) ? "20Mhz" :
				is_ht40(rate) ? "40Mhz" :
				is_ht80(rate) ? "80Mhz" : "ERR",
3748
				rate->index);
J
Johannes Berg 已提交
3749 3750 3751
		for (j = 0; j < IWL_RATE_COUNT; j++) {
			desc += sprintf(buff+desc,
				"counter=%d success=%d %%=%d\n",
E
Eyal Shapira 已提交
3752 3753 3754
				tbl->win[j].counter,
				tbl->win[j].success_counter,
				tbl->win[j].success_ratio);
J
Johannes Berg 已提交
3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767
		}
	}
	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,
};

3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824
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",
	};

	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++) {
3825
			stats = &(lq_sta->pers.tx_stats[col][rate]);
3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843
			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;
3844
	memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855

	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,
};

3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871
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",
3872
			 ss_force_name[lq_sta->pers.ss_force]);
3873 3874 3875 3876 3877 3878 3879 3880 3881 3882
	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)) {
3883
		lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3884
	} else if (!strncmp("siso", buf, 4)) {
3885
		lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3886 3887
	} else if (!strncmp("stbc", buf, 4)) {
		if (lq_sta->stbc_capable) {
3888
			lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3889 3890 3891 3892 3893 3894 3895
		} 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) {
3896
			lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918
		} 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 {		\
		if (!debugfs_create_file(#name, mode, parent, lq_sta,	\
					 &iwl_dbgfs_##name##_ops))	\
			goto err;					\
	} while (0)

MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);

3919
static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
J
Johannes Berg 已提交
3920
{
3921 3922 3923 3924 3925 3926 3927
	struct iwl_lq_sta *lq_sta = priv_sta;
	struct iwl_mvm_sta *mvmsta;

	mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);

	if (!mvmsta->vif)
		return;
3928

3929 3930 3931 3932 3933 3934 3935 3936 3937 3938
	debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
			    lq_sta, &rs_sta_dbgfs_scale_table_ops);
	debugfs_create_file("rate_stats_table", S_IRUSR, dir,
			    lq_sta, &rs_sta_dbgfs_stats_table_ops);
	debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
			    lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
	debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
			  &lq_sta->tx_agg_tid_en);
	debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
			  &lq_sta->pers.dbg_fixed_txp_reduction);
3939 3940 3941 3942 3943

	MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
	return;
err:
	IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
J
Johannes Berg 已提交
3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956
}

static void rs_remove_debugfs(void *mvm, void *mvm_sta)
{
}
#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.
 */
static void rs_rate_init_stub(void *mvm_r,
3957 3958 3959
			      struct ieee80211_supported_band *sband,
			      struct cfg80211_chan_def *chandef,
			      struct ieee80211_sta *sta, void *mvm_sta)
J
Johannes Berg 已提交
3960 3961
{
}
3962 3963

static const struct rate_control_ops rs_mvm_ops = {
J
Johannes Berg 已提交
3964
	.name = RS_NAME,
3965
	.tx_status = rs_mac80211_tx_status,
J
Johannes Berg 已提交
3966 3967 3968 3969 3970 3971
	.get_rate = rs_get_rate,
	.rate_init = rs_rate_init_stub,
	.alloc = rs_alloc,
	.free = rs_free,
	.alloc_sta = rs_alloc_sta,
	.free_sta = rs_free_sta,
3972
	.rate_update = rs_rate_update,
J
Johannes Berg 已提交
3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987
#ifdef CONFIG_MAC80211_DEBUGFS
	.add_sta_debugfs = rs_add_debugfs,
	.remove_sta_debugfs = rs_remove_debugfs,
#endif
};

int iwl_mvm_rate_control_register(void)
{
	return ieee80211_rate_control_register(&rs_mvm_ops);
}

void iwl_mvm_rate_control_unregister(void)
{
	ieee80211_rate_control_unregister(&rs_mvm_ops);
}
3988 3989 3990

/**
 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
S
Sara Sharon 已提交
3991
 * Tx protection, according to this request and previous requests,
3992 3993 3994 3995
 * and send the LQ command.
 * @mvmsta: The station
 * @enable: Enable Tx protection?
 */
3996 3997
int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
			  bool enable)
3998
{
3999 4000
	struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;

4001 4002 4003 4004
	lockdep_assert_held(&mvm->mutex);

	if (enable) {
		if (mvmsta->tx_protection == 0)
4005
			lq->flags |= LQ_FLAG_USE_RTS_MSK;
4006 4007 4008 4009
		mvmsta->tx_protection++;
	} else {
		mvmsta->tx_protection--;
		if (mvmsta->tx_protection == 0)
4010
			lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4011 4012
	}

4013
	return iwl_mvm_send_lq_cmd(mvm, lq, false);
4014
}