blob: ce907c58ebf6d83b632313f5af9c134a5ea2e109 [file] [log] [blame]
/******************************************************************************
*
* Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
* Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
* Copyright(c) 2016 Intel Deutschland GmbH
*
* 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 <linuxwifi@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"
#include "debugfs.h"
#define RS_NAME "iwl-mvm-rs"
#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
/* 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)
static u8 rs_ht_to_legacy[] = {
[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,
};
static const u8 ant_toggle_lookup[] = {
[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,
};
#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, \
IWL_RATE_##rn##M_INDEX }
#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 }
/*
* Parameter order:
* rate, ht rate, prev rate, next rate
*
* 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] = {
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 */
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 */
};
enum rs_action {
RS_ACTION_STAY = 0,
RS_ACTION_DOWNSCALE = -1,
RS_ACTION_UPSCALE = 1,
};
enum rs_column_mode {
RS_INVALID = 0,
RS_LEGACY,
RS_SISO,
RS_MIMO2,
};
#define MAX_NEXT_COLUMNS 7
#define MAX_COLUMN_CHECKS 3
struct rs_tx_column;
typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
struct ieee80211_sta *sta,
struct rs_rate *rate,
const struct rs_tx_column *next_col);
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];
};
static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
struct rs_rate *rate,
const struct rs_tx_column *next_col)
{
return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
}
static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
struct rs_rate *rate,
const struct rs_tx_column *next_col)
{
if (!sta->ht_cap.ht_supported)
return false;
if (sta->smps_mode == IEEE80211_SMPS_STATIC)
return false;
if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
return false;
if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
return false;
if (mvm->nvm_data->sku_cap_mimo_disabled)
return false;
return true;
}
static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
struct rs_rate *rate,
const struct rs_tx_column *next_col)
{
if (!sta->ht_cap.ht_supported)
return false;
return true;
}
static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
struct rs_rate *rate,
const struct rs_tx_column *next_col)
{
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;
if (is_ht160(rate) && (vht_cap->cap &
IEEE80211_VHT_CAP_SHORT_GI_160))
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,
RS_COLUMN_MIMO2,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
},
.checks = {
rs_ant_allow,
},
},
[RS_COLUMN_LEGACY_ANT_B] = {
.mode = RS_LEGACY,
.ant = ANT_B,
.next_columns = {
RS_COLUMN_LEGACY_ANT_A,
RS_COLUMN_SISO_ANT_B,
RS_COLUMN_MIMO2,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
},
.checks = {
rs_ant_allow,
},
},
[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,
RS_COLUMN_LEGACY_ANT_A,
RS_COLUMN_LEGACY_ANT_B,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
},
.checks = {
rs_siso_allow,
rs_ant_allow,
},
},
[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,
RS_COLUMN_LEGACY_ANT_A,
RS_COLUMN_LEGACY_ANT_B,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
},
.checks = {
rs_siso_allow,
rs_ant_allow,
},
},
[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,
RS_COLUMN_LEGACY_ANT_A,
RS_COLUMN_LEGACY_ANT_B,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
},
.checks = {
rs_siso_allow,
rs_ant_allow,
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,
RS_COLUMN_LEGACY_ANT_A,
RS_COLUMN_LEGACY_ANT_B,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
},
.checks = {
rs_siso_allow,
rs_ant_allow,
rs_sgi_allow,
},
},
[RS_COLUMN_MIMO2] = {
.mode = RS_MIMO2,
.ant = ANT_AB,
.next_columns = {
RS_COLUMN_SISO_ANT_A,
RS_COLUMN_MIMO2_SGI,
RS_COLUMN_LEGACY_ANT_A,
RS_COLUMN_LEGACY_ANT_B,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
},
.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,
RS_COLUMN_LEGACY_ANT_A,
RS_COLUMN_LEGACY_ANT_B,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
RS_COLUMN_INVALID,
},
.checks = {
rs_mimo_allow,
rs_sgi_allow,
},
},
};
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) {
idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
idx += IWL_RATE_MCS_0_INDEX;
/* skip 9M not supported in HT*/
if (idx >= IWL_RATE_9M_INDEX)
idx += 1;
if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
return idx;
} 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;
/* 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;
} else {
/* legacy rate format, search for match in table */
u8 legacy_rate = rs_extract_rate(rate_n_flags);
for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
if (iwl_rates[idx].plcp == legacy_rate)
return idx;
}
return IWL_RATE_INVALID;
}
static void rs_rate_scale_perform(struct iwl_mvm *mvm,
struct ieee80211_sta *sta,
struct iwl_lq_sta *lq_sta,
int tid, bool ndp);
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);
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.
*/
static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
};
/* Expected TpT tables. 4 indexes:
* 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
*/
static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
{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},
};
static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
{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},
};
static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
{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},
};
static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
{0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330},
{0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334},
{0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
{0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
};
static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
{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},
};
static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
{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},
};
static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
{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},
};
static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
{0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334},
{0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338},
{0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592},
{0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
};
/* 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)
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];
}
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->index <= IWL_RATE_54M_INDEX))
rate_str = legacy_rates[rate->index];
else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
(rate->index >= IWL_RATE_MCS_0_INDEX) &&
(rate->index <= IWL_RATE_MCS_9_INDEX))
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;
}
static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
const char *prefix)
{
IWL_DEBUG_RATE(mvm,
"%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
prefix, rs_pretty_rate(rate), rate->bw,
rate->sgi, rate->ldpc, rate->stbc);
}
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;
}
static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
struct iwl_scale_tbl_info *tbl)
{
int i;
IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&tbl->win[i]);
for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
rs_rate_scale_clear_window(&tbl->tpc_win[i]);
}
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,
struct iwl_lq_sta *lq_data, u8 tid,
struct ieee80211_sta *sta)
{
int ret = -EAGAIN;
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);
}
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.
*/
static int _rs_collect_tx_data(struct iwl_mvm *mvm,
struct iwl_scale_tbl_info *tbl,
int scale_index, int attempts, int successes,
struct iwl_rate_scale_data *window)
{
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. */
if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
(window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
window->average_tpt = (window->success_ratio * tpt + 64) / 128;
else
window->average_tpt = IWL_INVALID_VALUE;
return 0;
}
static int rs_collect_tpc_data(struct iwl_mvm *mvm,
struct iwl_lq_sta *lq_sta,
struct iwl_scale_tbl_info *tbl,
int scale_index, int attempts, int successes,
u8 reduced_txp)
{
struct iwl_rate_scale_data *window = NULL;
if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
return -EINVAL;
window = &tbl->tpc_win[reduced_txp];
return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
window);
}
static int rs_collect_tlc_data(struct iwl_mvm *mvm,
struct iwl_lq_sta *lq_sta,
struct iwl_scale_tbl_info *tbl,
int scale_index, int attempts, int successes)
{
struct iwl_rate_scale_data *window = NULL;
if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
return -EINVAL;
if (tbl->column != RS_COLUMN_INVALID) {
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;
}
/* Select window for current tx bit rate */
window = &(tbl->win[scale_index]);
return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
window);
}
/* Convert rs_rate object into ucode rate bitmask */
static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
struct rs_rate *rate)
{
u32 ucode_rate = 0;
int index = rate->index;
ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
RATE_MCS_ANT_ABC_MSK);
if (is_legacy(rate)) {
ucode_rate |= iwl_rates[index].plcp;
if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
ucode_rate |= RATE_MCS_CCK_MSK;
return ucode_rate;
}
if (is_ht(rate)) {
if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
index = IWL_LAST_HT_RATE;
}
ucode_rate |= RATE_MCS_HT_MSK;
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;
else
WARN_ON_ONCE(1);
} else if (is_vht(rate)) {
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;
}
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;
else
WARN_ON_ONCE(1);
} else {
IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
}
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;
}
ucode_rate |= rate->bw;
if (rate->sgi)
ucode_rate |= RATE_MCS_SGI_MSK;
if (rate->ldpc)
ucode_rate |= RATE_MCS_LDPC_MSK;
return ucode_rate;
}
/* Convert a ucode rate into an rs_rate object */
static int rs_rate_from_ucode_rate(const u32 ucode_rate,
enum nl80211_band band,
struct rs_rate *rate)
{
u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
u8 nss;
memset(rate, 0, sizeof(*rate));
rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
if (rate->index == IWL_RATE_INVALID)
return -EINVAL;
rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
/* Legacy */
if (!(ucode_rate & RATE_MCS_HT_MSK) &&
!(ucode_rate & RATE_MCS_VHT_MSK)) {
if (num_of_ant == 1) {
if (band == NL80211_BAND_5GHZ)
rate->type = LQ_LEGACY_A;
else
rate->type = LQ_LEGACY_G;
}
return 0;
}
/* HT or VHT */
if (ucode_rate & RATE_MCS_SGI_MSK)
rate->sgi = true;
if (ucode_rate & RATE_MCS_LDPC_MSK)
rate->ldpc = true;
if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
rate->stbc = true;
if (ucode_rate & RATE_MCS_BF_MSK)
rate->bfer = true;
rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
if (ucode_rate & RATE_MCS_HT_MSK) {
nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
RATE_HT_MCS_NSS_POS) + 1;
if (nss == 1) {
rate->type = LQ_HT_SISO;
WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
"stbc %d bfer %d",
rate->stbc, rate->bfer);
} else if (nss == 2) {
rate->type = LQ_HT_MIMO2;
WARN_ON_ONCE(num_of_ant != 2);
} else {
WARN_ON_ONCE(1);
}
} else if (ucode_rate & RATE_MCS_VHT_MSK) {
nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
RATE_VHT_MCS_NSS_POS) + 1;
if (nss == 1) {
rate->type = LQ_VHT_SISO;
WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
"stbc %d bfer %d",
rate->stbc, rate->bfer);
} else if (nss == 2) {
rate->type = LQ_VHT_MIMO2;
WARN_ON_ONCE(num_of_ant != 2);
} else {
WARN_ON_ONCE(1);
}
}
WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
!is_vht(rate));
return 0;
}
/* switch to another antenna/antennas and return 1 */
/* if no other valid antenna found, return 0 */
static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
{
u8 new_ant_type;
if (!rate->ant || rate->ant > ANT_ABC)
return 0;
if (!rs_is_valid_ant(valid_ant, rate->ant))
return 0;
new_ant_type = ant_toggle_lookup[rate->ant];
while ((new_ant_type != rate->ant) &&
!rs_is_valid_ant(valid_ant, new_ant_type))
new_ant_type = ant_toggle_lookup[new_ant_type];
if (new_ant_type == rate->ant)
return 0;
rate->ant = new_ant_type;
return 1;
}
static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
struct rs_rate *rate)
{
if (is_legacy(rate))
return lq_sta->active_legacy_rate;
else if (is_siso(rate))
return lq_sta->active_siso_rate;
else if (is_mimo2(rate))
return lq_sta->active_mimo2_rate;
WARN_ON_ONCE(1);
return 0;
}
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 */
if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
int i;
u32 mask;
/* Find the previous rate that is in the rate mask */
i = index - 1;
if (i >= 0)
mask = BIT(i);
for (; 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;
}
static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
struct rs_rate *rate)
{
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;
u16 high_low;
u16 rate_mask;
struct iwl_mvm *mvm = lq_sta->pers.drv;
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)
{
struct iwl_mvm *mvm = lq_sta->pers.drv;
if (is_legacy(rate)) {
/* No column to downgrade from Legacy */
return;
} else if (is_siso(rate)) {
/* Downgrade to Legacy if we were in SISO */
if (lq_sta->band == NL80211_BAND_5GHZ)
rate->type = LQ_LEGACY_A;
else
rate->type = LQ_LEGACY_G;
rate->bw = RATE_MCS_CHAN_WIDTH_20;
WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
rate->index > IWL_RATE_MCS_9_INDEX);
rate->index = rs_ht_to_legacy[rate->index];
rate->ldpc = false;
} else {
/* Downgrade to SISO with same MCS if in MIMO */
rate->type = is_vht_mimo2(rate) ?
LQ_VHT_SISO : LQ_HT_SISO;
}
if (num_of_ant(rate->ant) > 1)
rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
/* 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);
}
/* 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.
*/
static inline bool rs_rate_equal(struct rs_rate *a,
struct rs_rate *b,
bool allow_ant_mismatch)
{
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);
}
}
return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
(a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
}
/* Check if both rates share the same column */
static inline bool rs_rate_column_match(struct rs_rate *a,
struct rs_rate *b)
{
bool ant_match;
if (a->stbc || a->bfer)
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;
}
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;
}
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, bool ndp)
{
int legacy_success;
int retries;
int i;
struct iwl_lq_cmd *table;
u32 lq_hwrate;
struct rs_rate lq_rate, tx_resp_rate;
struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
IWL_UCODE_TLV_API_LQ_SS_PARAMS);
/* Treat uninitialized rate scaling data same as non-existing. */
if (!lq_sta) {
IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
return;
} else if (!lq_sta->pers.drv) {
IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
return;
}
/* This packet was aggregated but doesn't carry status info */
if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
!(info->flags & IEEE80211_TX_STAT_AMPDU))
return;
rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
#ifdef CONFIG_MAC80211_DEBUGFS
/* Disable last tx check if we are debugging with fixed rate but
* update tx stats */
if (lq_sta->pers.dbg_fixed_rate) {
int index = tx_resp_rate.index;
enum rs_column column;
int attempts, success;
column = rs_get_column_from_rate(&tx_resp_rate);
if (WARN_ONCE(column == RS_COLUMN_INVALID,
"Can't map rate 0x%x to column",
tx_resp_hwrate))
return;
if (info->flags & IEEE80211_TX_STAT_AMPDU) {
attempts = info->status.ampdu_len;
success = info->status.ampdu_ack_len;
} else {
attempts = info->status.rates[0].count;
success = !!(info->flags & IEEE80211_TX_STAT_ACK);
}
lq_sta->pers.tx_stats[column][index].total += attempts;
lq_sta->pers.tx_stats[column][index].success += success;
IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
tx_resp_hwrate, success, attempts);
return;
}
#endif
if (time_after(jiffies,
(unsigned long)(lq_sta->last_tx +
(IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
int t;
IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
for (t = 0; t < IWL_MAX_TID_COUNT; t++)
ieee80211_stop_tx_ba_session(sta, t);
iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
return;
}
lq_sta->last_tx = jiffies;
/* Ignore this Tx frame response if its initial rate doesn't match
* that of latest Link Quality command. There may be stragglers
* from a previous Link Quality command, but we're no longer interested
* in those; they're either from the "active" mode while we're trying
* to check "search" mode, or a prior "search" mode after we've moved
* to a new "search" mode (which might become the new "active" mode).
*/
table = &lq_sta->lq;
lq_hwrate = le32_to_cpu(table->rs_table[0]);
rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
/* Here we actually compare this rate to the latest LQ command */
if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
IWL_DEBUG_RATE(mvm,
"initial tx resp rate 0x%x does not match 0x%x\n",
tx_resp_hwrate, lq_hwrate);
/*
* Since rates mis-match, the last LQ command may have failed.
* After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
* ... driver.
*/
lq_sta->missed_rate_counter++;
if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
lq_sta->missed_rate_counter = 0;
IWL_DEBUG_RATE(mvm,
"Too many rates mismatch. Send sync LQ. rs_state %d\n",
lq_sta->rs_state);
iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
}
/* 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;
if (!lq_sta->search_better_tbl) {
curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
} else {
curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
}
if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
IWL_DEBUG_RATE(mvm,
"Neither active nor search matches tx rate\n");
tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
rs_dump_rate(mvm, &lq_rate, "ACTUAL");
/*
* no matching table found, let's by-pass the data collection
* and continue to perform rate scale to find the rate table
*/
rs_stay_in_table(lq_sta, true);
goto done;
}
/*
* Updating the frame history depends on whether packets were
* aggregated.
*
* For aggregation, all packets were transmitted at the same rate, the
* first index into rate scale table.
*/
if (info->flags & IEEE80211_TX_STAT_AMPDU) {
rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
info->status.ampdu_len,
info->status.ampdu_ack_len,
reduced_txp);
/* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
* it as a single frame loss as we don't want the success ratio
* to dip too quickly because a BA wasn't received.
* For TPC, there's no need for this optimisation since we want
* to recover very quickly from a bad power reduction and,
* therefore we'd like the success ratio to get an immediate hit
* when failing to get a BA, so we'd switch back to a lower or
* zero power reduction. When FW transmits agg with a rate
* different from the initial rate, it will not use reduced txp
* and will send BA notification twice (one empty with reduced
* txp equal to the value from LQ and one with reduced txp 0).
* We need to update counters for each txp level accordingly.
*/
if (info->status.ampdu_ack_len == 0)
info->status.ampdu_len = 1;
rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
info->status.ampdu_len,
info->status.ampdu_ack_len);
/* Update success/fail counts if not searching for new mode */
if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
lq_sta->total_success += info->status.ampdu_ack_len;
lq_sta->total_failed += (info->status.ampdu_len -
info->status.ampdu_ack_len);
}
} else {
/* For legacy, update frame history with for each Tx retry. */
retries = info->status.rates[0].count - 1;
/* HW doesn't send more than 15 retries */
retries = min(retries, 15);
/* The last transmission may have been successful */
legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
/* Collect data for each rate used during failed TX attempts */
for (i = 0; i <= retries; ++i) {
lq_hwrate = le32_to_cpu(table->rs_table[i]);
rs_rate_from_ucode_rate(lq_hwrate, info->band,
&lq_rate);
/*
* Only collect stats if retried rate is in the same RS
* table as active/search.
*/
if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
tmp_tbl = curr_tbl;
else if (rs_rate_column_match(&lq_rate,
&other_tbl->rate))
tmp_tbl = other_tbl;
else
continue;
rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
lq_rate.index, 1,
i < retries ? 0 : legacy_success,
reduced_txp);
rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
lq_rate.index, 1,
i < retries ? 0 : legacy_success);
}
/* Update success/fail counts if not searching for new mode */
if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
lq_sta->total_success += legacy_success;
lq_sta->total_failed += retries + (1 - legacy_success);
}
}
/* The last TX rate is cached in lq_sta; it's set in if/else above */
lq_sta->last_rate_n_flags = lq_hwrate;
IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
done:
/* See if there's a better rate or modulation mode to try. */
if (sta->supp_rates[info->band])
rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
}
/*
* 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);
if (!iwl_mvm_sta_from_mac80211(sta)->vif)
return;
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,
ieee80211_is_qos_nullfunc(hdr->frame_control));
}
/*
* 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)
{
IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
if (is_legacy) {
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;
} else {
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;
}
lq_sta->table_count = 0;
lq_sta->total_failed = 0;
lq_sta->total_success = 0;
lq_sta->flush_timer = jiffies;
lq_sta->visited_columns = 0;
}
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;
}
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;
}
static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
const struct rs_tx_column *column,
u32 bw)
{
/* Used to choose among HT tables */
const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
column->mode != RS_SISO &&
column->mode != RS_MIMO2))
return expected_tpt_legacy;
/* Legacy rates have only one table */
if (column->mode == RS_LEGACY)
return expected_tpt_legacy;
ht_tbl_pointer = expected_tpt_mimo2_20MHz;
/* Choose among many HT tables depending on number of streams
* (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
* status */
if (column->mode == RS_SISO) {
switch (bw) {
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;
case RATE_MCS_CHAN_WIDTH_160:
ht_tbl_pointer = expected_tpt_siso_160MHz;
break;
default:
WARN_ON_ONCE(1);
}
} else if (column->mode == RS_MIMO2) {
switch (bw) {
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;
case RATE_MCS_CHAN_WIDTH_160:
ht_tbl_pointer = expected_tpt_mimo2_160MHz;
break;
default:
WARN_ON_ONCE(1);
}
} else {
WARN_ON_ONCE(1);
}
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];
else /* AGG+SGI */
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);
}
static s32 rs_get_best_rate(struct iwl_mvm *mvm,
struct iwl_lq_sta *lq_sta,
struct iwl_scale_tbl_info *tbl, /* "search" */
unsigned long rate_mask, s8 index)
{
struct iwl_scale_tbl_info *active_tbl =
&(lq_sta->lq_info[lq_sta->active_tbl]);
s32 success_ratio = active_tbl->win[index].success_ratio;
u16 expected_current_tpt = active_tbl->expected_tpt[index];
const u16 *tpt_tbl = tbl->expected_tpt;
u16 high_low;
u32 target_tpt;
int rate_idx;
if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
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,
"SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
success_ratio, target_tpt);
}
rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
while (rate_idx != IWL_RATE_INVALID) {
if (target_tpt < (100 * tpt_tbl[rate_idx]))
break;
high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
tbl->rate.type);
rate_idx = (high_low >> 8) & 0xff;
}
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;
}
static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
{
switch (sta->bandwidth) {
case IEEE80211_STA_RX_BW_160:
return RATE_MCS_CHAN_WIDTH_160;
case IEEE80211_STA_RX_BW_80:
return RATE_MCS_CHAN_WIDTH_80;
case IEEE80211_STA_RX_BW_40:
return RATE_MCS_CHAN_WIDTH_40;
case IEEE80211_STA_RX_BW_20:
default:
return RATE_MCS_CHAN_WIDTH_20;
}
}
/*
* 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;
mvm = lq_sta->pers.drv;
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 */
if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
/* Elapsed time using current modulation mode */
if (lq_sta->flush_timer)
flush_interval_passed =
time_after(jiffies,
(unsigned long)(lq_sta->flush_timer +
(IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
/*
* 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 */
lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
IWL_DEBUG_RATE(mvm,
"Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
lq_sta->total_failed = 0;
lq_sta->total_success = 0;
lq_sta->flush_timer = 0;
/* mark the current column as visited */
lq_sta->visited_columns = BIT(tbl->column);
/*
* 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");
rs_rate_scale_clear_tbl_windows(mvm, tbl);
}
}
/* If transitioning to allow "search", reset all history
* bitmaps and stats in active table (this will become the new
* "search" table). */
if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
rs_rate_scale_clear_tbl_windows(mvm, tbl);
}
}
}
static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
struct iwl_scale_tbl_info *tbl,
enum rs_action scale_action)
{
struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
scale_action == RS_ACTION_DOWNSCALE)
sta_priv->tlc_amsdu = false;
else
sta_priv->tlc_amsdu = true;
}
/*
* setup rate table in uCode
*/
static void rs_update_rate_tbl(struct iwl_mvm *mvm,
struct ieee80211_sta *sta,
struct iwl_lq_sta *lq_sta,
struct iwl_scale_tbl_info *tbl)
{
rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
}
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;
}
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)
{
int i, j, max_rate;
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;
u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
const u16 *expected_tpt_tbl;
u16 tpt, max_expected_tpt;
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];
if (allow_func && !allow_func(mvm, sta, &tbl->rate,
next_col))
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,
rs_bw_from_sta_bw(sta));
if (WARN_ON_ONCE(!expected_tpt_tbl))
continue;
max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
if (max_rate == IWL_RATE_INVALID) {
IWL_DEBUG_RATE(mvm,
"Skip column %d: no rate is allowed in this column\n",
next_col_id);
continue;
}
max_expected_tpt = expected_tpt_tbl[max_rate];
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;
}
IWL_DEBUG_RATE(mvm,
"Found potential column %d. Max expected %d current %d\n",
next_col_id, max_expected_tpt, tpt);
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));
unsigned long rate_mask = 0;
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 == NL80211_BAND_5GHZ)
rate->type = LQ_LEGACY_A;
else
rate->type = LQ_LEGACY_G;
rate->bw = RATE_MCS_CHAN_WIDTH_20;
rate->ldpc = false;
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 {
WARN_ONCE(1, "Bad column mode");
}
if (column->mode != RS_LEGACY) {
rate->bw = rs_bw_from_sta_bw(sta);
rate->ldpc = lq_sta->ldpc;
}
search_tbl->column = col_id;
rs_set_expected_tpt_table(lq_sta, search_tbl);
lq_sta->visited_columns |= BIT(col_id);
/* 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"
" rate mask %lx\n",
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;
}
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;
if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
(current_tpt == 0)) {
IWL_DEBUG_RATE(mvm,
"Decrease rate because of low SR\n");
return RS_ACTION_DOWNSCALE;
}
if ((low_tpt == IWL_INVALID_VALUE) &&
(high_tpt == IWL_INVALID_VALUE) &&
(high != IWL_RATE_INVALID)) {
IWL_DEBUG_RATE(mvm,
"No data about high/low rates. Increase rate\n");
return RS_ACTION_UPSCALE;
}
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;
}
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;
}
if ((low_tpt != IWL_INVALID_VALUE) &&
(high_tpt != IWL_INVALID_VALUE) &&
(low_tpt < current_tpt) &&
(high_tpt < current_tpt)) {
IWL_DEBUG_RATE(mvm,
"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)) {
IWL_DEBUG_RATE(mvm,
"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)) {
if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
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");
}
}
return action;
}
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
*/
if (!lq_sta->stbc_capable)
return false;
if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
return false;
return true;
}
static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
int *weaker, int *stronger)
{
*weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
if (*weaker > TPC_MAX_REDUCTION)
*weaker = TPC_INVALID;
*stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
if (*stronger < 0)
*stronger = TPC_INVALID;
}
static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
struct rs_rate *rate, enum nl80211_band band)
{
int index = rate->index;
bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
!vif->bss_conf.ps);
IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
cam, sta_ps_disabled);
/*
* allow tpc only if power management is enabled, or bt coex
* activity grade allows it and we are on 2.4Ghz.
*/
if ((cam || sta_ps_disabled) &&
!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 */
if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
current_tpt == 0) {
IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
return TPC_ACTION_NO_RESTIRCTION;
}
/* try decreasing first if applicable */
if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
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 */
if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
strong != TPC_INVALID) {
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)
{
struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
struct ieee80211_vif *vif = mvm_sta->vif;
struct ieee80211_chanctx_conf *chanctx_conf;
enum nl80211_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;
#ifdef CONFIG_MAC80211_DEBUGFS
if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
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;
}
#endif
rcu_read_lock();
chanctx_conf = rcu_dereference(vif->chanctx_conf);
if (WARN_ON(!chanctx_conf))
band = NUM_NL80211_BANDS;
else
band = chanctx_conf->def.chan->band;
rcu_read_unlock();
if (!rs_tpc_allowed(mvm, vif, rate, band)) {
IWL_DEBUG_RATE(mvm,
"tpc is not allowed. remove txp restrictions\n");
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) {
IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
action = TPC_ACTION_STAY;
} else if (strong == TPC_INVALID &&
(action == TPC_ACTION_INCREASE ||
action == TPC_ACTION_NO_RESTIRCTION)) {
IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
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;
}
/*
* Do rate scaling and search for new modulation mode.
*/
static void rs_rate_scale_perform(struct iwl_mvm *mvm,
struct ieee80211_sta *sta,
struct iwl_lq_sta *lq_sta,
int tid, bool ndp)
{
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;
enum rs_action scale_action = RS_ACTION_STAY;
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;
u8 prev_agg = lq_sta->is_agg;
struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
struct iwl_mvm_tid_data *tid_data;
struct rs_rate *rate;
lq_sta->is_agg = !!sta_priv->agg_tids;
/*
* 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]);
rate = &tbl->rate;
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);
rs_rate_scale_clear_tbl_windows(mvm, tbl);
}
/* current tx rate */
index = rate->index;
/* rates available for this association, and for modulation mode */
rate_mask = rs_get_supported_rates(lq_sta, rate);
if (!(BIT(index) & rate_mask)) {
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*/
rate->type = LQ_NONE;
lq_sta->search_better_tbl = 0;
tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
}
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;
}
/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
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;
if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
(window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
IWL_DEBUG_RATE(mvm,
"%s: Test Window: succ %d total %d\n",
rs_pretty_rate(rate),
window->success_counter, window->counter);
/* 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);
return;
}
/* 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,
"SWITCHING TO NEW TABLE SR: %d "
"cur-tpt %d old-tpt %d\n",
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,
"GOING BACK TO THE OLD TABLE: SR %d "
"cur-tpt %d old-tpt %d\n",
window->success_ratio,
window->average_tpt,
lq_sta->last_tpt);
/* Nullify "search" table */
rate->type = LQ_NONE;
/* Revert to "active" table */
active_tbl = lq_sta->active_tbl;
tbl = &(lq_sta->lq_info[active_tbl]);
/* Revert to "active" rate and throughput info */
index = tbl->rate.index;
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. */
high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
low = high_low & 0xff;
high = (high_low >> 8) & 0xff;
/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
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;
IWL_DEBUG_RATE(mvm,
"%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
rs_pretty_rate(rate), current_tpt, sr,
low, high, low_tpt, high_tpt);
scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
current_tpt, low_tpt, high_tpt);
/* Force a search in case BT doesn't like us being in MIMO */
if (is_mimo(rate) &&
!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
IWL_DEBUG_RATE(mvm,
"BT Coex forbids MIMO. Search for new config\n");
rs_stay_in_table(lq_sta, true);
goto lq_update;
}
switch (scale_action) {
case RS_ACTION_DOWNSCALE:
/* Decrease starting rate, update uCode's rate table */
if (low != IWL_RATE_INVALID) {
update_lq = 1;
index = low;
} else {
IWL_DEBUG_RATE(mvm,
"At the bottom rate. Can't decrease\n");
}
break;
case RS_ACTION_UPSCALE:
/* Increase starting rate, update uCode's rate table */
if (high != IWL_RATE_INVALID) {
update_lq = 1;
index = high;
} else {
IWL_DEBUG_RATE(mvm,
"At the top rate. Can't increase\n");
}
break;
case RS_ACTION_STAY:
/* No change */
if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
break;
default:
break;
}
lq_update:
/* Replace uCode's rate table for the destination station. */
if (update_lq) {
tbl->rate.index = index;
if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
rs_set_amsdu_len(mvm, sta, tbl, scale_action);
rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
}
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 &&
lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
&& window->counter) {
enum rs_column next_column;
/* Save current throughput to compare with "search" throughput*/
lq_sta->last_tpt = current_tpt;
IWL_DEBUG_RATE(mvm,
"Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
update_lq, done_search, lq_sta->rs_state,
window->counter);
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;
}
/* 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)]);
rs_rate_scale_clear_tbl_windows(mvm, tbl);
/* Use new "search" start rate */
index = tbl->rate.index;
rs_dump_rate(mvm, &tbl->rate,
"Switch to SEARCH TABLE:");
rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
} else {
done_search = 1;
}
}
if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
/* 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]);
if (is_legacy(&tbl1->rate)) {
IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
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);
}
}
rs_set_stay_in_table(mvm, 1, lq_sta);
} else {
/* 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 && !ndp) {
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);
}
}
}
struct rs_init_rate_info {
s8 rssi;
u8 rate_idx;
};
static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
{ -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 },
};
static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
{ -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 },
};
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},
};
/* MCS index 9 is not valid for 20MHz VHT channel width,
* but is ok for 40, 80 and 160MHz channels.
*/
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[] = {
{ -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 },
};
#define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
/* 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 == NL80211_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