blob: 785da5397b4404a05787aa6236a9a77a62153814 [file] [log] [blame]
/******************************************************************************
*
* Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
*
* 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 "dev.h"
#include "agn.h"
#define RS_NAME "iwl-agn-rs"
#define NUM_TRY_BEFORE_ANT_TOGGLE 1
#define IWL_NUMBER_TRY 1
#define IWL_HT_NUMBER_TRY 3
#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
/* max allowed rate miss before sync LQ cmd */
#define IWL_MISSED_RATE_MAX 15
/* max time to accum history 2 seconds */
#define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
static u8 rs_ht_to_legacy[] = {
IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
IWL_RATE_6M_INDEX,
IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
IWL_RATE_48M_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, ip, in, rp, rn, pp, np) \
[IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
IWL_RATE_SISO_##s##M_PLCP, \
IWL_RATE_MIMO2_##s##M_PLCP,\
IWL_RATE_MIMO3_##s##M_PLCP,\
IWL_RATE_##r##M_IEEE, \
IWL_RATE_##ip##M_INDEX, \
IWL_RATE_##in##M_INDEX, \
IWL_RATE_##rp##M_INDEX, \
IWL_RATE_##rn##M_INDEX, \
IWL_RATE_##pp##M_INDEX, \
IWL_RATE_##np##M_INDEX }
/*
* Parameter order:
* rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
*
* If there isn't a valid next or previous rate then INV is used which
* maps to IWL_RATE_INVALID
*
*/
const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
/* FIXME:RS: ^^ should be INV (legacy) */
};
static inline u8 rs_extract_rate(u32 rate_n_flags)
{
return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
}
static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
{
int idx = 0;
/* HT rate format */
if (rate_n_flags & RATE_MCS_HT_MSK) {
idx = rs_extract_rate(rate_n_flags);
if (idx >= IWL_RATE_MIMO3_6M_PLCP)
idx = idx - IWL_RATE_MIMO3_6M_PLCP;
else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
idx = idx - IWL_RATE_MIMO2_6M_PLCP;
idx += IWL_FIRST_OFDM_RATE;
/* skip 9M not supported in ht*/
if (idx >= IWL_RATE_9M_INDEX)
idx += 1;
if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
return idx;
/* legacy rate format, search for match in table */
} else {
for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
if (iwl_rates[idx].plcp ==
rs_extract_rate(rate_n_flags))
return idx;
}
return -1;
}
static void rs_rate_scale_perform(struct iwl_priv *priv,
struct sk_buff *skb,
struct ieee80211_sta *sta,
struct iwl_lq_sta *lq_sta);
static void rs_fill_link_cmd(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
#ifdef CPTCFG_MAC80211_DEBUGFS
static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
u32 *rate_n_flags, int index);
#else
static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
u32 *rate_n_flags, int index)
{}
#endif
/**
* 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
};
static const u16 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
{0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
{0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
{0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
{0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
};
static const u16 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
{0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
{0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
{0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
{0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
};
static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
{0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
{0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
{0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
{0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
};
static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
{0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
{0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
{0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
{0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
};
static const u16 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
{0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
{0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
{0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
{0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
};
static const u16 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
{0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
{0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
{0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
{0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
};
/* 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 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;
window->stamp = 0;
}
static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
{
return (ant_type & valid_antenna) == ant_type;
}
/*
* removes the old data from the statistics. All data that is older than
* TID_MAX_TIME_DIFF, will be deleted.
*/
static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
{
/* The oldest age we want to keep */
u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
while (tl->queue_count &&
(tl->time_stamp < oldest_time)) {
tl->total -= tl->packet_count[tl->head];
tl->packet_count[tl->head] = 0;
tl->time_stamp += TID_QUEUE_CELL_SPACING;
tl->queue_count--;
tl->head++;
if (tl->head >= TID_QUEUE_MAX_SIZE)
tl->head = 0;
}
}
/*
* increment traffic load value for tid and also remove
* any old values if passed the certain time period
*/
static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
struct ieee80211_hdr *hdr)
{
u32 curr_time = jiffies_to_msecs(jiffies);
u32 time_diff;
s32 index;
struct iwl_traffic_load *tl = NULL;
u8 tid;
if (ieee80211_is_data_qos(hdr->frame_control)) {
u8 *qc = ieee80211_get_qos_ctl(hdr);
tid = qc[0] & 0xf;
} else
return IWL_MAX_TID_COUNT;
if (unlikely(tid >= IWL_MAX_TID_COUNT))
return IWL_MAX_TID_COUNT;
tl = &lq_data->load[tid];
curr_time -= curr_time % TID_ROUND_VALUE;
/* Happens only for the first packet. Initialize the data */
if (!(tl->queue_count)) {
tl->total = 1;
tl->time_stamp = curr_time;
tl->queue_count = 1;
tl->head = 0;
tl->packet_count[0] = 1;
return IWL_MAX_TID_COUNT;
}
time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
index = time_diff / TID_QUEUE_CELL_SPACING;
/* The history is too long: remove data that is older than */
/* TID_MAX_TIME_DIFF */
if (index >= TID_QUEUE_MAX_SIZE)
rs_tl_rm_old_stats(tl, curr_time);
index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
tl->packet_count[index] = tl->packet_count[index] + 1;
tl->total = tl->total + 1;
if ((index + 1) > tl->queue_count)
tl->queue_count = index + 1;
return tid;
}
#ifdef CPTCFG_MAC80211_DEBUGFS
/**
* 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_priv *priv,
struct iwl_lq_sta *lq_sta)
{
struct iwl_station_priv *sta_priv =
container_of(lq_sta, struct iwl_station_priv, lq_sta);
struct iwl_rxon_context *ctx = sta_priv->ctx;
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 */
lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
if (lq_sta->dbg_fixed_rate) {
rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
false);
}
}
#endif
/*
get the traffic load value for tid
*/
static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
{
u32 curr_time = jiffies_to_msecs(jiffies);
u32 time_diff;
s32 index;
struct iwl_traffic_load *tl = NULL;
if (tid >= IWL_MAX_TID_COUNT)
return 0;
tl = &(lq_data->load[tid]);
curr_time -= curr_time % TID_ROUND_VALUE;
if (!(tl->queue_count))
return 0;
time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
index = time_diff / TID_QUEUE_CELL_SPACING;
/* The history is too long: remove data that is older than */
/* TID_MAX_TIME_DIFF */
if (index >= TID_QUEUE_MAX_SIZE)
rs_tl_rm_old_stats(tl, curr_time);
return tl->total;
}
static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
struct iwl_lq_sta *lq_data, u8 tid,
struct ieee80211_sta *sta)
{
int ret = -EAGAIN;
u32 load;
/*
* Don't create TX aggregation sessions when in high
* BT traffic, as they would just be disrupted by BT.
*/
if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
IWL_DEBUG_COEX(priv,
"BT traffic (%d), no aggregation allowed\n",
priv->bt_traffic_load);
return ret;
}
load = rs_tl_get_load(lq_data, tid);
IWL_DEBUG_HT(priv, "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(priv, "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_priv *priv, 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(priv, lq_data, tid, sta);
else
IWL_ERR(priv, "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_scale_tbl_info *tbl,
int scale_index, int attempts, int successes)
{
struct iwl_rate_scale_data *window = NULL;
static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
s32 fail_count, tpt;
if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
return -EINVAL;
/* Select window for current tx bit rate */
window = &(tbl->win[scale_index]);
/* 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_RATE_MIN_FAILURE_TH) ||
(window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
window->average_tpt = (window->success_ratio * tpt + 64) / 128;
else
window->average_tpt = IWL_INVALID_VALUE;
/* Tag this window as having been updated */
window->stamp = jiffies;
return 0;
}
/*
* Fill uCode API rate_n_flags field, based on "search" or "active" table.
*/
/* FIXME:RS:remove this function and put the flags statically in the table */
static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
struct iwl_scale_tbl_info *tbl,
int index, u8 use_green)
{
u32 rate_n_flags = 0;
if (is_legacy(tbl->lq_type)) {
rate_n_flags = iwl_rates[index].plcp;
if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
rate_n_flags |= RATE_MCS_CCK_MSK;
} else if (is_Ht(tbl->lq_type)) {
if (index > IWL_LAST_OFDM_RATE) {
IWL_ERR(priv, "Invalid HT rate index %d\n", index);
index = IWL_LAST_OFDM_RATE;
}
rate_n_flags = RATE_MCS_HT_MSK;
if (is_siso(tbl->lq_type))
rate_n_flags |= iwl_rates[index].plcp_siso;
else if (is_mimo2(tbl->lq_type))
rate_n_flags |= iwl_rates[index].plcp_mimo2;
else
rate_n_flags |= iwl_rates[index].plcp_mimo3;
} else {
IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
}
rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
RATE_MCS_ANT_ABC_MSK);
if (is_Ht(tbl->lq_type)) {
if (tbl->is_ht40) {
if (tbl->is_dup)
rate_n_flags |= RATE_MCS_DUP_MSK;
else
rate_n_flags |= RATE_MCS_HT40_MSK;
}
if (tbl->is_SGI)
rate_n_flags |= RATE_MCS_SGI_MSK;
if (use_green) {
rate_n_flags |= RATE_MCS_GF_MSK;
if (is_siso(tbl->lq_type) && tbl->is_SGI) {
rate_n_flags &= ~RATE_MCS_SGI_MSK;
IWL_ERR(priv, "GF was set with SGI:SISO\n");
}
}
}
return rate_n_flags;
}
/*
* Interpret uCode API's rate_n_flags format,
* fill "search" or "active" tx mode table.
*/
static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
enum ieee80211_band band,
struct iwl_scale_tbl_info *tbl,
int *rate_idx)
{
u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
u8 mcs;
memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
*rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
if (*rate_idx == IWL_RATE_INVALID) {
*rate_idx = -1;
return -EINVAL;
}
tbl->is_SGI = 0; /* default legacy setup */
tbl->is_ht40 = 0;
tbl->is_dup = 0;
tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
tbl->lq_type = LQ_NONE;
tbl->max_search = IWL_MAX_SEARCH;
/* legacy rate format */
if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
if (num_of_ant == 1) {
if (band == IEEE80211_BAND_5GHZ)
tbl->lq_type = LQ_A;
else
tbl->lq_type = LQ_G;
}
/* HT rate format */
} else {
if (rate_n_flags & RATE_MCS_SGI_MSK)
tbl->is_SGI = 1;
if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
(rate_n_flags & RATE_MCS_DUP_MSK))
tbl->is_ht40 = 1;
if (rate_n_flags & RATE_MCS_DUP_MSK)
tbl->is_dup = 1;
mcs = rs_extract_rate(rate_n_flags);
/* SISO */
if (mcs <= IWL_RATE_SISO_60M_PLCP) {
if (num_of_ant == 1)
tbl->lq_type = LQ_SISO; /*else NONE*/
/* MIMO2 */
} else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
if (num_of_ant == 2)
tbl->lq_type = LQ_MIMO2;
/* MIMO3 */
} else {
if (num_of_ant == 3) {
tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
tbl->lq_type = LQ_MIMO3;
}
}
}
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, u32 *rate_n_flags,
struct iwl_scale_tbl_info *tbl)
{
u8 new_ant_type;
if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
return 0;
if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
return 0;
new_ant_type = ant_toggle_lookup[tbl->ant_type];
while ((new_ant_type != tbl->ant_type) &&
!rs_is_valid_ant(valid_ant, new_ant_type))
new_ant_type = ant_toggle_lookup[new_ant_type];
if (new_ant_type == tbl->ant_type)
return 0;
tbl->ant_type = new_ant_type;
*rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
*rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
return 1;
}
/**
* Green-field mode is valid if the station supports it and
* there are no non-GF stations present in the BSS.
*/
static bool rs_use_green(struct ieee80211_sta *sta)
{
/*
* There's a bug somewhere in this code that causes the
* scaling to get stuck because GF+SGI can't be combined
* in SISO rates. Until we find that bug, disable GF, it
* has only limited benefit and we still interoperate with
* GF APs since we can always receive GF transmissions.
*/
return false;
}
/**
* rs_get_supported_rates - get the available rates
*
* if management frame or broadcast frame only return
* basic available rates.
*
*/
static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
struct ieee80211_hdr *hdr,
enum iwl_table_type rate_type)
{
if (is_legacy(rate_type)) {
return lq_sta->active_legacy_rate;
} else {
if (is_siso(rate_type))
return lq_sta->active_siso_rate;
else if (is_mimo2(rate_type))
return lq_sta->active_mimo2_rate;
else
return lq_sta->active_mimo3_rate;
}
}
static u16 rs_get_adjacent_rate(struct iwl_priv *priv, 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_a_band(rate_type) || !is_legacy(rate_type)) {
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;
IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
}
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;
IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
}
return (high << 8) | low;
}
static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
struct iwl_scale_tbl_info *tbl,
u8 scale_index, u8 ht_possible)
{
s32 low;
u16 rate_mask;
u16 high_low;
u8 switch_to_legacy = 0;
u8 is_green = lq_sta->is_green;
struct iwl_priv *priv = lq_sta->drv;
/* check if we need to switch from HT to legacy rates.
* assumption is that mandatory rates (1Mbps or 6Mbps)
* are always supported (spec demand) */
if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
switch_to_legacy = 1;
scale_index = rs_ht_to_legacy[scale_index];
if (lq_sta->band == IEEE80211_BAND_5GHZ)
tbl->lq_type = LQ_A;
else
tbl->lq_type = LQ_G;
if (num_of_ant(tbl->ant_type) > 1)
tbl->ant_type =
first_antenna(priv->nvm_data->valid_tx_ant);
tbl->is_ht40 = 0;
tbl->is_SGI = 0;
tbl->max_search = IWL_MAX_SEARCH;
}
rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
/* Mask with station rate restriction */
if (is_legacy(tbl->lq_type)) {
/* supp_rates has no CCK bits in A mode */
if (lq_sta->band == IEEE80211_BAND_5GHZ)
rate_mask = (u16)(rate_mask &
(lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
else
rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
}
/* If we switched from HT to legacy, check current rate */
if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
low = scale_index;
goto out;
}
high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
tbl->lq_type);
low = high_low & 0xff;
if (low == IWL_RATE_INVALID)
low = scale_index;
out:
return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
}
/*
* Simple function to compare two rate scale table types
*/
static bool table_type_matches(struct iwl_scale_tbl_info *a,
struct iwl_scale_tbl_info *b)
{
return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
(a->is_SGI == b->is_SGI);
}
static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
struct iwl_lq_sta *lq_sta)
{
struct iwl_scale_tbl_info *tbl;
bool full_concurrent = priv->bt_full_concurrent;
if (priv->bt_ant_couple_ok) {
/*
* Is there a need to switch between
* full concurrency and 3-wire?
*/
if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
full_concurrent = true;
else
full_concurrent = false;
}
if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
(priv->bt_full_concurrent != full_concurrent)) {
priv->bt_full_concurrent = full_concurrent;
priv->last_bt_traffic_load = priv->bt_traffic_load;
/* Update uCode's rate table. */
tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
queue_work(priv->workqueue, &priv->bt_full_concurrency);
}
}
/*
* mac80211 sends us Tx status
*/
static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta, void *priv_sta,
struct sk_buff *skb)
{
int legacy_success;
int retries;
int rs_index, mac_index, i;
struct iwl_lq_sta *lq_sta = priv_sta;
struct iwl_link_quality_cmd *table;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
enum mac80211_rate_control_flags mac_flags;
u32 tx_rate;
struct iwl_scale_tbl_info tbl_type;
struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
struct iwl_rxon_context *ctx = sta_priv->ctx;
IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
/* Treat uninitialized rate scaling data same as non-existing. */
if (!lq_sta) {
IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
return;
} else if (!lq_sta->drv) {
IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
return;
}
if (!ieee80211_is_data(hdr->frame_control) ||
info->flags & IEEE80211_TX_CTL_NO_ACK)
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;
/*
* 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;
tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
if (priv->band == IEEE80211_BAND_5GHZ)
rs_index -= IWL_FIRST_OFDM_RATE;
mac_flags = info->status.rates[0].flags;
mac_index = info->status.rates[0].idx;
/* For HT packets, map MCS to PLCP */
if (mac_flags & IEEE80211_TX_RC_MCS) {
mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
mac_index++;
/*
* mac80211 HT index is always zero-indexed; we need to move
* HT OFDM rates after CCK rates in 2.4 GHz band
*/
if (priv->band == IEEE80211_BAND_2GHZ)
mac_index += IWL_FIRST_OFDM_RATE;
}
/* Here we actually compare this rate to the latest LQ command */
if ((mac_index < 0) ||
(tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
(tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
(tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
(tbl_type.ant_type != info->status.antenna) ||
(!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
(!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
(rs_index != mac_index)) {
IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
/*
* 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_MISSED_RATE_MAX) {
lq_sta->missed_rate_counter = 0;
iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, 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;
/* Figure out if rate scale algorithm is in active or search table */
if (table_type_matches(&tbl_type,
&(lq_sta->lq_info[lq_sta->active_tbl]))) {
curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
} else if (table_type_matches(&tbl_type,
&lq_sta->lq_info[1 - lq_sta->active_tbl])) {
curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
} else {
IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
/*
* 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) {
tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
&rs_index);
rs_collect_tx_data(curr_tbl, rs_index,
info->status.ampdu_len,
info->status.ampdu_ack_len);
/* Update success/fail counts if not searching for new mode */
if (lq_sta->stay_in_tbl) {
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) {
tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
rs_get_tbl_info_from_mcs(tx_rate, priv->band,
&tbl_type, &rs_index);
/*
* Only collect stats if retried rate is in the same RS
* table as active/search.
*/
if (table_type_matches(&tbl_type, curr_tbl))
tmp_tbl = curr_tbl;
else if (table_type_matches(&tbl_type, other_tbl))
tmp_tbl = other_tbl;
else
continue;
rs_collect_tx_data(tmp_tbl, rs_index, 1,
i < retries ? 0 : legacy_success);
}
/* Update success/fail counts if not searching for new mode */
if (lq_sta->stay_in_tbl) {
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 = tx_rate;
done:
/* See if there's a better rate or modulation mode to try. */
if (sta && sta->supp_rates[sband->band])
rs_rate_scale_perform(priv, skb, sta, lq_sta);
if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist)
rs_bt_update_lq(priv, ctx, lq_sta);
}
/*
* 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_priv *priv, u8 is_legacy,
struct iwl_lq_sta *lq_sta)
{
IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
lq_sta->stay_in_tbl = 1; /* only place this gets set */
if (is_legacy) {
lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
} else {
lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
lq_sta->max_success_limit = IWL_NONE_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->action_counter = 0;
}
/*
* Find correct throughput table for given mode of modulation
*/
static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
struct iwl_scale_tbl_info *tbl)
{
/* Used to choose among HT tables */
const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
/* Check for invalid LQ type */
if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
tbl->expected_tpt = expected_tpt_legacy;
return;
}
/* Legacy rates have only one table */
if (is_legacy(tbl->lq_type)) {
tbl->expected_tpt = expected_tpt_legacy;
return;
}
/* Choose among many HT tables depending on number of streams
* (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
* status */
if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
ht_tbl_pointer = expected_tpt_siso20MHz;
else if (is_siso(tbl->lq_type))
ht_tbl_pointer = expected_tpt_siso40MHz;
else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
ht_tbl_pointer = expected_tpt_mimo2_20MHz;
else if (is_mimo2(tbl->lq_type))
ht_tbl_pointer = expected_tpt_mimo2_40MHz;
else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
ht_tbl_pointer = expected_tpt_mimo3_20MHz;
else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
ht_tbl_pointer = expected_tpt_mimo3_40MHz;
if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
tbl->expected_tpt = ht_tbl_pointer[0];
else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
tbl->expected_tpt = ht_tbl_pointer[1];
else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
tbl->expected_tpt = ht_tbl_pointer[2];
else /* AGG+SGI */
tbl->expected_tpt = ht_tbl_pointer[3];
}
/*
* Find starting rate for new "search" high-throughput mode of modulation.
* Goal is to find lowest expected rate (under perfect conditions) that is
* above the current measured throughput of "active" mode, to give new mode
* a fair chance to prove itself without too many challenges.
*
* This gets called when transitioning to more aggressive modulation
* (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
* (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
* to decrease to match "active" throughput. When moving from MIMO to SISO,
* bit rate will typically need to increase, but not if performance was bad.
*/
static s32 rs_get_best_rate(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta,
struct iwl_scale_tbl_info *tbl, /* "search" */
u16 rate_mask, s8 index)
{
/* "active" values */
struct iwl_scale_tbl_info *active_tbl =
&(lq_sta->lq_info[lq_sta->active_tbl]);
s32 active_sr = active_tbl->win[index].success_ratio;
s32 active_tpt = active_tbl->expected_tpt[index];
/* expected "search" throughput */
const u16 *tpt_tbl = tbl->expected_tpt;
s32 new_rate, high, low, start_hi;
u16 high_low;
s8 rate = index;
new_rate = high = low = start_hi = IWL_RATE_INVALID;
for (; ;) {
high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
tbl->lq_type);
low = high_low & 0xff;
high = (high_low >> 8) & 0xff;
/*
* Lower the "search" bit rate, to give new "search" mode
* approximately the same throughput as "active" if:
*
* 1) "Active" mode has been working modestly well (but not
* great), and expected "search" throughput (under perfect
* conditions) at candidate rate is above the actual
* measured "active" throughput (but less than expected
* "active" throughput under perfect conditions).
* OR
* 2) "Active" mode has been working perfectly or very well
* and expected "search" throughput (under perfect
* conditions) at candidate rate is above expected
* "active" throughput (under perfect conditions).
*/
if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
((active_sr > IWL_RATE_DECREASE_TH) &&
(active_sr <= IWL_RATE_HIGH_TH) &&
(tpt_tbl[rate] <= active_tpt))) ||
((active_sr >= IWL_RATE_SCALE_SWITCH) &&
(tpt_tbl[rate] > active_tpt))) {
/* (2nd or later pass)
* If we've already tried to raise the rate, and are
* now trying to lower it, use the higher rate. */
if (start_hi != IWL_RATE_INVALID) {
new_rate = start_hi;
break;
}
new_rate = rate;
/* Loop again with lower rate */
if (low != IWL_RATE_INVALID)
rate = low;
/* Lower rate not available, use the original */
else
break;
/* Else try to raise the "search" rate to match "active" */
} else {
/* (2nd or later pass)
* If we've already tried to lower the rate, and are
* now trying to raise it, use the lower rate. */
if (new_rate != IWL_RATE_INVALID)
break;
/* Loop again with higher rate */
else if (high != IWL_RATE_INVALID) {
start_hi = high;
rate = high;
/* Higher rate not available, use the original */
} else {
new_rate = rate;
break;
}
}
}
return new_rate;
}
/*
* Set up search table for MIMO2
*/
static int rs_switch_to_mimo2(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta,
struct iwl_scale_tbl_info *tbl, int index)
{
u16 rate_mask;
s32 rate;
s8 is_green = lq_sta->is_green;
struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
struct iwl_rxon_context *ctx = sta_priv->ctx;
if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
return -1;
if (sta->smps_mode == IEEE80211_SMPS_STATIC)
return -1;
/* Need both Tx chains/antennas to support MIMO */
if (priv->hw_params.tx_chains_num < 2)
return -1;
IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
tbl->lq_type = LQ_MIMO2;
tbl->is_dup = lq_sta->is_dup;
tbl->action = 0;
tbl->max_search = IWL_MAX_SEARCH;
rate_mask = lq_sta->active_mimo2_rate;
if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
tbl->is_ht40 = 1;
else
tbl->is_ht40 = 0;
rs_set_expected_tpt_table(lq_sta, tbl);
rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
rate, rate_mask);
return -1;
}
tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
tbl->current_rate, is_green);
return 0;
}
/*
* Set up search table for MIMO3
*/
static int rs_switch_to_mimo3(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta,
struct iwl_scale_tbl_info *tbl, int index)
{
u16 rate_mask;
s32 rate;
s8 is_green = lq_sta->is_green;
struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
struct iwl_rxon_context *ctx = sta_priv->ctx;
if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
return -1;
if (sta->smps_mode == IEEE80211_SMPS_STATIC)
return -1;
/* Need both Tx chains/antennas to support MIMO */
if (priv->hw_params.tx_chains_num < 3)
return -1;
IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
tbl->lq_type = LQ_MIMO3;
tbl->is_dup = lq_sta->is_dup;
tbl->action = 0;
tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
rate_mask = lq_sta->active_mimo3_rate;
if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
tbl->is_ht40 = 1;
else
tbl->is_ht40 = 0;
rs_set_expected_tpt_table(lq_sta, tbl);
rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
rate, rate_mask);
if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
rate, rate_mask);
return -1;
}
tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
tbl->current_rate, is_green);
return 0;
}
/*
* Set up search table for SISO
*/
static int rs_switch_to_siso(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta,
struct iwl_scale_tbl_info *tbl, int index)
{
u16 rate_mask;
u8 is_green = lq_sta->is_green;
s32 rate;
struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
struct iwl_rxon_context *ctx = sta_priv->ctx;
if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
return -1;
IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
tbl->is_dup = lq_sta->is_dup;
tbl->lq_type = LQ_SISO;
tbl->action = 0;
tbl->max_search = IWL_MAX_SEARCH;
rate_mask = lq_sta->active_siso_rate;
if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
tbl->is_ht40 = 1;
else
tbl->is_ht40 = 0;
if (is_green)
tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
rs_set_expected_tpt_table(lq_sta, tbl);
rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
rate, rate_mask);
return -1;
}
tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
tbl->current_rate, is_green);
return 0;
}
/*
* Try to switch to new modulation mode from legacy
*/
static int rs_move_legacy_other(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta,
int index)
{
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 iwl_rate_scale_data *window = &(tbl->win[index]);
u32 sz = (sizeof(struct iwl_scale_tbl_info) -
(sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action;
u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
u8 tx_chains_num = priv->hw_params.tx_chains_num;
int ret = 0;
u8 update_search_tbl_counter = 0;
switch (priv->bt_traffic_load) {
case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
/* nothing */
break;
case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
/* avoid antenna B unless MIMO */
if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
tbl->action = IWL_LEGACY_SWITCH_SISO;
break;
case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
/* avoid antenna B and MIMO */
valid_tx_ant =
first_antenna(priv->nvm_data->valid_tx_ant);
if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
tbl->action != IWL_LEGACY_SWITCH_SISO)
tbl->action = IWL_LEGACY_SWITCH_SISO;
break;
default:
IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
break;
}
if (!iwl_ht_enabled(priv))
/* stay in Legacy */
tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
tbl->action > IWL_LEGACY_SWITCH_SISO)
tbl->action = IWL_LEGACY_SWITCH_SISO;
/* configure as 1x1 if bt full concurrency */
if (priv->bt_full_concurrent) {
if (!iwl_ht_enabled(priv))
tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
tbl->action = IWL_LEGACY_SWITCH_SISO;
valid_tx_ant =
first_antenna(priv->nvm_data->valid_tx_ant);
}
start_action = tbl->action;
for (; ;) {
lq_sta->action_counter++;
switch (tbl->action) {
case IWL_LEGACY_SWITCH_ANTENNA1:
case IWL_LEGACY_SWITCH_ANTENNA2:
IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
tx_chains_num <= 1) ||
(tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
tx_chains_num <= 2))
break;
/* Don't change antenna if success has been great */
if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
!priv->bt_full_concurrent &&
priv->bt_traffic_load ==
IWL_BT_COEX_TRAFFIC_LOAD_NONE)
break;
/* Set up search table to try other antenna */
memcpy(search_tbl, tbl, sz);
if (rs_toggle_antenna(valid_tx_ant,
&search_tbl->current_rate, search_tbl)) {
update_search_tbl_counter = 1;
rs_set_expected_tpt_table(lq_sta, search_tbl);
goto out;
}
break;
case IWL_LEGACY_SWITCH_SISO:
IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
/* Set up search table to try SISO */
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret) {
lq_sta->action_counter = 0;
goto out;
}
break;
case IWL_LEGACY_SWITCH_MIMO2_AB:
case IWL_LEGACY_SWITCH_MIMO2_AC:
case IWL_LEGACY_SWITCH_MIMO2_BC:
IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
/* Set up search table to try MIMO */
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
search_tbl->ant_type = ANT_AB;
else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
search_tbl->ant_type = ANT_AC;
else
search_tbl->ant_type = ANT_BC;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret) {
lq_sta->action_counter = 0;
goto out;
}
break;
case IWL_LEGACY_SWITCH_MIMO3_ABC:
IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
/* Set up search table to try MIMO3 */
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
search_tbl->ant_type = ANT_ABC;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret) {
lq_sta->action_counter = 0;
goto out;
}
break;
}
tbl->action++;
if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
if (tbl->action == start_action)
break;
}
search_tbl->lq_type = LQ_NONE;
return 0;
out:
lq_sta->search_better_tbl = 1;
tbl->action++;
if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
if (update_search_tbl_counter)
search_tbl->action = tbl->action;
return 0;
}
/*
* Try to switch to new modulation mode from SISO
*/
static int rs_move_siso_to_other(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta, int index)
{
u8 is_green = lq_sta->is_green;
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 iwl_rate_scale_data *window = &(tbl->win[index]);
struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
u32 sz = (sizeof(struct iwl_scale_tbl_info) -
(sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action;
u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
u8 tx_chains_num = priv->hw_params.tx_chains_num;
u8 update_search_tbl_counter = 0;
int ret;
switch (priv->bt_traffic_load) {
case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
/* nothing */
break;
case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
/* avoid antenna B unless MIMO */
if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
break;
case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
/* avoid antenna B and MIMO */
valid_tx_ant =
first_antenna(priv->nvm_data->valid_tx_ant);
if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
tbl->action = IWL_SISO_SWITCH_ANTENNA1;
break;
default:
IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
break;
}
if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
/* stay in SISO */
tbl->action = IWL_SISO_SWITCH_ANTENNA1;
}
/* configure as 1x1 if bt full concurrency */
if (priv->bt_full_concurrent) {
valid_tx_ant =
first_antenna(priv->nvm_data->valid_tx_ant);
if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
tbl->action = IWL_SISO_SWITCH_ANTENNA1;
}
start_action = tbl->action;
for (;;) {
lq_sta->action_counter++;
switch (tbl->action) {
case IWL_SISO_SWITCH_ANTENNA1:
case IWL_SISO_SWITCH_ANTENNA2:
IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
tx_chains_num <= 1) ||
(tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
tx_chains_num <= 2))
break;
if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
!priv->bt_full_concurrent &&
priv->bt_traffic_load ==
IWL_BT_COEX_TRAFFIC_LOAD_NONE)
break;
memcpy(search_tbl, tbl, sz);
if (rs_toggle_antenna(valid_tx_ant,
&search_tbl->current_rate, search_tbl)) {
update_search_tbl_counter = 1;
goto out;
}
break;
case IWL_SISO_SWITCH_MIMO2_AB:
case IWL_SISO_SWITCH_MIMO2_AC:
case IWL_SISO_SWITCH_MIMO2_BC:
IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
search_tbl->ant_type = ANT_AB;
else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
search_tbl->ant_type = ANT_AC;
else
search_tbl->ant_type = ANT_BC;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret)
goto out;
break;
case IWL_SISO_SWITCH_GI:
if (!tbl->is_ht40 && !(ht_cap->cap &
IEEE80211_HT_CAP_SGI_20))
break;
if (tbl->is_ht40 && !(ht_cap->cap &
IEEE80211_HT_CAP_SGI_40))
break;
IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
memcpy(search_tbl, tbl, sz);
if (is_green) {
if (!tbl->is_SGI)
break;
else
IWL_ERR(priv,
"SGI was set in GF+SISO\n");
}
search_tbl->is_SGI = !tbl->is_SGI;
rs_set_expected_tpt_table(lq_sta, search_tbl);
if (tbl->is_SGI) {
s32 tpt = lq_sta->last_tpt / 100;
if (tpt >= search_tbl->expected_tpt[index])
break;
}
search_tbl->current_rate =
rate_n_flags_from_tbl(priv, search_tbl,
index, is_green);
update_search_tbl_counter = 1;
goto out;
case IWL_SISO_SWITCH_MIMO3_ABC:
IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
search_tbl->ant_type = ANT_ABC;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret)
goto out;
break;
}
tbl->action++;
if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
tbl->action = IWL_SISO_SWITCH_ANTENNA1;
if (tbl->action == start_action)
break;
}
search_tbl->lq_type = LQ_NONE;
return 0;
out:
lq_sta->search_better_tbl = 1;
tbl->action++;
if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
tbl->action = IWL_SISO_SWITCH_ANTENNA1;
if (update_search_tbl_counter)
search_tbl->action = tbl->action;
return 0;
}
/*
* Try to switch to new modulation mode from MIMO2
*/
static int rs_move_mimo2_to_other(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta, int index)
{
s8 is_green = lq_sta->is_green;
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 iwl_rate_scale_data *window = &(tbl->win[index]);
struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
u32 sz = (sizeof(struct iwl_scale_tbl_info) -
(sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action;
u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
u8 tx_chains_num = priv->hw_params.tx_chains_num;
u8 update_search_tbl_counter = 0;
int ret;
switch (priv->bt_traffic_load) {
case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
/* nothing */
break;
case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
/* avoid antenna B and MIMO */
if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
tbl->action = IWL_MIMO2_SWITCH_SISO_A;
break;
case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
/* avoid antenna B unless MIMO */
if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
tbl->action == IWL_MIMO2_SWITCH_SISO_C)
tbl->action = IWL_MIMO2_SWITCH_SISO_A;
break;
default:
IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
break;
}
if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
(tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
/* switch in SISO */
tbl->action = IWL_MIMO2_SWITCH_SISO_A;
}
/* configure as 1x1 if bt full concurrency */
if (priv->bt_full_concurrent &&
(tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
tbl->action > IWL_MIMO2_SWITCH_SISO_C))
tbl->action = IWL_MIMO2_SWITCH_SISO_A;
start_action = tbl->action;
for (;;) {
lq_sta->action_counter++;
switch (tbl->action) {
case IWL_MIMO2_SWITCH_ANTENNA1:
case IWL_MIMO2_SWITCH_ANTENNA2:
IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
if (tx_chains_num <= 2)
break;
if (window->success_ratio >= IWL_RS_GOOD_RATIO)
break;
memcpy(search_tbl, tbl, sz);
if (rs_toggle_antenna(valid_tx_ant,
&search_tbl->current_rate, search_tbl)) {
update_search_tbl_counter = 1;
goto out;
}
break;
case IWL_MIMO2_SWITCH_SISO_A:
case IWL_MIMO2_SWITCH_SISO_B:
case IWL_MIMO2_SWITCH_SISO_C:
IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
/* Set up new search table for SISO */
memcpy(search_tbl, tbl, sz);
if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
search_tbl->ant_type = ANT_A;
else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
search_tbl->ant_type = ANT_B;
else
search_tbl->ant_type = ANT_C;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret)
goto out;
break;
case IWL_MIMO2_SWITCH_GI:
if (!tbl->is_ht40 && !(ht_cap->cap &
IEEE80211_HT_CAP_SGI_20))
break;
if (tbl->is_ht40 && !(ht_cap->cap &
IEEE80211_HT_CAP_SGI_40))
break;
IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
/* Set up new search table for MIMO2 */
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = !tbl->is_SGI;
rs_set_expected_tpt_table(lq_sta, search_tbl);
/*
* If active table already uses the fastest possible
* modulation (dual stream with short guard interval),
* and it's working well, there's no need to look
* for a better type of modulation!
*/
if (tbl->is_SGI) {
s32 tpt = lq_sta->last_tpt / 100;
if (tpt >= search_tbl->expected_tpt[index])
break;
}
search_tbl->current_rate =
rate_n_flags_from_tbl(priv, search_tbl,
index, is_green);
update_search_tbl_counter = 1;
goto out;
case IWL_MIMO2_SWITCH_MIMO3_ABC:
IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
search_tbl->ant_type = ANT_ABC;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret)
goto out;
break;
}
tbl->action++;
if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
if (tbl->action == start_action)
break;
}
search_tbl->lq_type = LQ_NONE;
return 0;
out:
lq_sta->search_better_tbl = 1;
tbl->action++;
if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
if (update_search_tbl_counter)
search_tbl->action = tbl->action;
return 0;
}
/*
* Try to switch to new modulation mode from MIMO3
*/
static int rs_move_mimo3_to_other(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta, int index)
{
s8 is_green = lq_sta->is_green;
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 iwl_rate_scale_data *window = &(tbl->win[index]);
struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
u32 sz = (sizeof(struct iwl_scale_tbl_info) -
(sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action;
u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
u8 tx_chains_num = priv->hw_params.tx_chains_num;
int ret;
u8 update_search_tbl_counter = 0;
switch (priv->bt_traffic_load) {
case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
/* nothing */
break;
case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
/* avoid antenna B and MIMO */
if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
tbl->action = IWL_MIMO3_SWITCH_SISO_A;
break;
case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
/* avoid antenna B unless MIMO */
if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
tbl->action == IWL_MIMO3_SWITCH_SISO_C)
tbl->action = IWL_MIMO3_SWITCH_SISO_A;
break;
default:
IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
break;
}
if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
(tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
/* switch in SISO */
tbl->action = IWL_MIMO3_SWITCH_SISO_A;
}
/* configure as 1x1 if bt full concurrency */
if (priv->bt_full_concurrent &&
(tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
tbl->action > IWL_MIMO3_SWITCH_SISO_C))
tbl->action = IWL_MIMO3_SWITCH_SISO_A;
start_action = tbl->action;
for (;;) {
lq_sta->action_counter++;
switch (tbl->action) {
case IWL_MIMO3_SWITCH_ANTENNA1:
case IWL_MIMO3_SWITCH_ANTENNA2:
IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
if (tx_chains_num <= 3)
break;
if (window->success_ratio >= IWL_RS_GOOD_RATIO)
break;
memcpy(search_tbl, tbl, sz);
if (rs_toggle_antenna(valid_tx_ant,
&search_tbl->current_rate, search_tbl))
goto out;
break;
case IWL_MIMO3_SWITCH_SISO_A:
case IWL_MIMO3_SWITCH_SISO_B:
case IWL_MIMO3_SWITCH_SISO_C:
IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
/* Set up new search table for SISO */
memcpy(search_tbl, tbl, sz);
if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
search_tbl->ant_type = ANT_A;
else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
search_tbl->ant_type = ANT_B;
else
search_tbl->ant_type = ANT_C;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret)
goto out;
break;
case IWL_MIMO3_SWITCH_MIMO2_AB:
case IWL_MIMO3_SWITCH_MIMO2_AC:
case IWL_MIMO3_SWITCH_MIMO2_BC:
IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
search_tbl->ant_type = ANT_AB;
else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
search_tbl->ant_type = ANT_AC;
else
search_tbl->ant_type = ANT_BC;
if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
break;
ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret)
goto out;
break;
case IWL_MIMO3_SWITCH_GI:
if (!tbl->is_ht40 && !(ht_cap->cap &
IEEE80211_HT_CAP_SGI_20))
break;
if (tbl->is_ht40 && !(ht_cap->cap &
IEEE80211_HT_CAP_SGI_40))
break;
IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
/* Set up new search table for MIMO */
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = !tbl->is_SGI;
rs_set_expected_tpt_table(lq_sta, search_tbl);
/*
* If active table already uses the fastest possible
* modulation (dual stream with short guard interval),
* and it's working well, there's no need to look
* for a better type of modulation!
*/
if (tbl->is_SGI) {
s32 tpt = lq_sta->last_tpt / 100;
if (tpt >= search_tbl->expected_tpt[index])
break;
}
search_tbl->current_rate =
rate_n_flags_from_tbl(priv, search_tbl,
index, is_green);
update_search_tbl_counter = 1;
goto out;
}
tbl->action++;
if (tbl->action > IWL_MIMO3_SWITCH_GI)
tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
if (tbl->action == start_action)
break;
}
search_tbl->lq_type = LQ_NONE;
return 0;
out:
lq_sta->search_better_tbl = 1;
tbl->action++;
if (tbl->action > IWL_MIMO3_SWITCH_GI)
tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
if (update_search_tbl_counter)
search_tbl->action = tbl->action;
return 0;
}
/*
* 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 i;
int active_tbl;
int flush_interval_passed = 0;
struct iwl_priv *priv;
priv = lq_sta->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->stay_in_tbl) {
/* Elapsed time using current modulation mode */
if (lq_sta->flush_timer)
flush_interval_passed =
time_after(jiffies,
(unsigned long)(lq_sta->flush_timer +
IWL_RATE_SCALE_FLUSH_INTVL));
/*
* 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(priv, "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->stay_in_tbl = 0; /* only place reset */
lq_sta->total_failed = 0;
lq_sta->total_success = 0;
lq_sta->flush_timer = 0;
/*
* 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(priv, "LQ: stay in table clear win\n");
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(
&(tbl->win[i]));
}
}
/* If transitioning to allow "search", reset all history
* bitmaps and stats in active table (this will become the new
* "search" table). */
if (!lq_sta->stay_in_tbl) {
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&(tbl->win[i]));
}
}
}
/*
* setup rate table in uCode
*/
static void rs_update_rate_tbl(struct iwl_priv *priv,
struct iwl_rxon_context *ctx,
struct iwl_lq_sta *lq_sta,
struct iwl_scale_tbl_info *tbl,
int index, u8 is_green)
{
u32 rate;
/* Update uCode's rate table. */
rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
rs_fill_link_cmd(priv, lq_sta, rate);
iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
}
/*
* Do rate scaling and search for new modulation mode.
*/
static void rs_rate_scale_perform(struct iwl_priv *priv,
struct sk_buff *skb,
struct ieee80211_sta *sta,
struct iwl_lq_sta *lq_sta)
{
struct ieee80211_hw *hw = priv->hw;
struct ieee80211_conf *conf = &hw->conf;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
int low = IWL_RATE_INVALID;
int high = IWL_RATE_INVALID;
int index;
int i;
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;
s8 scale_action = 0;
u16 rate_mask;
u8 update_lq = 0;
struct iwl_scale_tbl_info *tbl, *tbl1;
u16 rate_scale_index_msk = 0;
u8 is_green = 0;
u8 active_tbl = 0;
u8 done_search = 0;
u16 high_low;
s32 sr;
u8 tid = IWL_MAX_TID_COUNT;
struct iwl_tid_data *tid_data;
struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
struct iwl_rxon_context *ctx = sta_priv->ctx;
IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
/* Send management frames and NO_ACK data using lowest rate. */
/* TODO: this could probably be improved.. */
if (!ieee80211_is_data(hdr->frame_control) ||
info->flags & IEEE80211_TX_CTL_NO_ACK)
return;
lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
tid = rs_tl_add_packet(lq_sta, hdr);
if ((tid != IWL_MAX_TID_COUNT) &&
(lq_sta->tx_agg_tid_en & (1 << tid))) {
tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
if (tid_data->agg.state == IWL_AGG_OFF)
lq_sta->is_agg = 0;
else
lq_sta->is_agg = 1;
} else
lq_sta->is_agg = 0;
/*
* 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]);
if (is_legacy(tbl->lq_type))
lq_sta->is_green = 0;
else
lq_sta->is_green = rs_use_green(sta);
is_green = lq_sta->is_green;
/* current tx rate */
index = lq_sta->last_txrate_idx;
IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
tbl->lq_type);
/* rates available for this association, and for modulation mode */
rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
/* mask with station rate restriction */
if (is_legacy(tbl->lq_type)) {
if (lq_sta->band == IEEE80211_BAND_5GHZ)
/* supp_rates has no CCK bits in A mode */
rate_scale_index_msk = (u16) (rate_mask &
(lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
else
rate_scale_index_msk = (u16) (rate_mask &
lq_sta->supp_rates);
} else
rate_scale_index_msk = rate_mask;
if (!rate_scale_index_msk)
rate_scale_index_msk = rate_mask;
if (!((1 << index) & rate_scale_index_msk)) {
IWL_ERR(priv, "Current Rate is not valid\n");
if (lq_sta->search_better_tbl) {
/* revert to active table if search table is not valid*/
tbl->lq_type = LQ_NONE;
lq_sta->search_better_tbl = 0;
tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
/* get "active" rate info */
index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
index, is_green);
}
return;
}
/* Get expected throughput table and history window for current rate */
if (!tbl->expected_tpt) {
IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
return;
}
/* force user max rate if set by user */
if ((lq_sta->max_rate_idx != -1) &&
(lq_sta->max_rate_idx < index)) {
index = lq_sta->max_rate_idx;
update_lq = 1;
window = &(tbl->win[index]);
goto lq_update;
}
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_RATE_MIN_FAILURE_TH) &&
(window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
"for index %d\n",
window->success_counter, window->counter, index);
/* 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);
goto out;
}
/* Else we have enough samples; calculate estimate of
* actual average throughput */
if (window->average_tpt != ((window->success_ratio *
tbl->expected_tpt[index] + 64) / 128)) {
IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
window->average_tpt = ((window->success_ratio *
tbl->expected_tpt[index] + 64) / 128);
}
/* If we are searching for better modulation mode, check success. */
if (lq_sta->search_better_tbl &&
(iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
/* 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(priv, "LQ: SWITCHING TO NEW TABLE "
"suc=%d cur-tpt=%d old-tpt=%d\n",
window->success_ratio,
window->average_tpt,
lq_sta->last_tpt);
if (!is_legacy(tbl->lq_type))
lq_sta->enable_counter = 1;
/* 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(priv, "LQ: GOING BACK TO THE OLD TABLE "
"suc=%d cur-tpt=%d old-tpt=%d\n",
window->success_ratio,
window->average_tpt,
lq_sta->last_tpt);
/* Nullify "search" table */
tbl->lq_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 = iwl_hwrate_to_plcp_idx(tbl->current_rate);
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(priv, index, rate_scale_index_msk,
tbl->lq_type);
low = high_low & 0xff;
high = (high_low >> 8) & 0xff;
/* If user set max rate, dont allow higher than user constrain */
if ((lq_sta->max_rate_idx != -1) &&
(lq_sta->max_rate_idx < high))
high = IWL_RATE_INVALID;
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;
scale_action = 0;
/* Too many failures, decrease rate */
if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
scale_action = -1;
/* No throughput measured yet for adjacent rates; try increase. */
} else if ((low_tpt == IWL_INVALID_VALUE) &&
(high_tpt == IWL_INVALID_VALUE)) {
if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
scale_action = 1;
else if (low != IWL_RATE_INVALID)
scale_action = 0;
}
/* Both adjacent throughputs are measured, but neither one has better
* throughput; we're using the best rate, don't change it! */
else if ((low_tpt != IWL_INVALID_VALUE) &&
(high_tpt != IWL_INVALID_VALUE) &&
(low_tpt < current_tpt) &&
(high_tpt < current_tpt))
scale_action = 0;
/* At least one adjacent rate's throughput is measured,
* and may have better performance. */
else {
/* Higher adjacent rate's throughput is measured */
if (high_tpt != IWL_INVALID_VALUE) {
/* Higher rate has better throughput */
if (high_tpt > current_tpt &&
sr >= IWL_RATE_INCREASE_TH) {
scale_action = 1;
} else {
scale_action = 0;
}
/* Lower adjacent rate's throughput is measured */
} else if (low_tpt != IWL_INVALID_VALUE) {
/* Lower rate has better throughput */
if (low_tpt > current_tpt) {
IWL_DEBUG_RATE(priv,
"decrease rate because of low tpt\n");
scale_action = -1;
} else if (sr >= IWL_RATE_INCREASE_TH) {
scale_action = 1;
}
}
}
/* Sanity check; asked for decrease, but success rate or throughput
* has been good at old rate. Don't change it. */
if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
((sr > IWL_RATE_HIGH_TH) ||
(current_tpt > (100 * tbl->expected_tpt[low]))))
scale_action = 0;
if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
scale_action = -1;
if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
(is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
scale_action = -1;
if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
(is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
/*
* don't set scale_action, don't want to scale up if
* the rate scale doesn't otherwise think that is a
* good idea.
*/
} else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
scale_action = -1;
}
}
lq_sta->last_bt_traffic = priv->bt_traffic_load;
if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
(is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
/* search for a new modulation */
rs_stay_in_table(lq_sta, true);
goto lq_update;
}
switch (scale_action) {
case -1:
/* Decrease starting rate, update uCode's rate table */
if (low != IWL_RATE_INVALID) {
update_lq = 1;
index = low;
}
break;
case 1:
/* Increase starting rate, update uCode's rate table */
if (high != IWL_RATE_INVALID) {
update_lq = 1;
index = high;
}
break;
case 0:
/* No change */
default:
break;
}
IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
"high %d type %d\n",
index, scale_action, low, high, tbl->lq_type);
lq_update:
/* Replace uCode's rate table for the destination station. */
if (update_lq)
rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
/* Should we stay with this modulation mode,
* or search for a new one? */
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->stay_in_tbl && window->counter) {
/* Save current throughput to compare with "search" throughput*/
lq_sta->last_tpt = current_tpt;
/* Select a new "search" modulation mode to try.
* If one is found, set up the new "search" table. */
if (is_legacy(tbl->lq_type))
rs_move_legacy_other(priv, lq_sta, conf, sta, index);
else if (is_siso(tbl->lq_type))
rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
else if (is_mimo2(tbl->lq_type))
rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
else
rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
/* 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)]);
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&(tbl->win[i]));
/* Use new "search" start rate */
index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
tbl->current_rate, index);
rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
} else
done_search = 1;
}
if (done_search && !lq_sta->stay_in_tbl) {
/* 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->lq_type) && !conf_is_ht(conf) &&
lq_sta->action_counter > tbl1->max_search) {
IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
rs_set_stay_in_table(priv, 1, lq_sta);
}
/* 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->enable_counter &&
(lq_sta->action_counter >= tbl1->max_search) &&
iwl_ht_enabled(priv)) {
if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
(lq_sta->tx_agg_tid_en & (1 << tid)) &&
(tid != IWL_MAX_TID_COUNT)) {
u8 sta_id = lq_sta->lq.sta_id;
tid_data = &priv->tid_data[sta_id][tid];
if (tid_data->agg.state == IWL_AGG_OFF) {
IWL_DEBUG_RATE(priv,
"try to aggregate tid %d\n",
tid);
rs_tl_turn_on_agg(priv, tid,
lq_sta, sta);
}
}
rs_set_stay_in_table(priv, 0, lq_sta);
}
}
out:
tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
lq_sta->last_txrate_idx = index;
}
/**
* 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_priv *priv,
struct ieee80211_sta *