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linux/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
Wey-Yi Guy 47eef9bd10 iwlwifi: Use RTS/CTS as the preferred protection mechanism for 6000 series 
When 802.11g was introduced, we had RTS/CTS and CTS-to-Self protection
mechanisms. In an HT Beacon, HT stations use the "Operating Mode" field
in the HT Information Element to determine whether or not to use
protection.

The Operating Mode field has 4 possible settings: 0-3:
Mode 0: If all stations in the BSS are 20/40 MHz HT capable, or if the
BSS is 20/40 MHz capable, or if all stations in the BSS are 20 MHz HT
stations in a 20 MHz BSS
Mode 1: used if there are non-HT stations or APs using the primary or
secondary channels
Mode 2: if only HT stations are associated in the BSS and at least one
20 MHz HT station is associated.
Mode 3: used if one or more non-HT stations are associated in the BSS.

When in operating modes 1 or 3, and the Use_Protection field is 1 in the
Beacon's ERP IE, all HT transmissions must be protected using RTS/CTS or
CTS-to-Self.

By default, CTS-to-self is the preferred protection mechanism for less
overhead and higher throughput; but using the full RTS/CTS will better
protect the inner exchange from interference, especially in
highly-congested environment.

For 6000 series WIFI NIC, RTS/CTS protection mechanism is the
recommended choice for HT traffic based on the HW design.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-10-07 16:39:33 -04:00

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/******************************************************************************
*
* Copyright(c) 2005 - 2009 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/init.h>
#include <linux/skbuff.h>
#include <linux/wireless.h>
#include <net/mac80211.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include "iwl-dev.h"
#include "iwl-sta.h"
#include "iwl-core.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,
};
/**
* struct iwl_rate_scale_data -- tx success history for one rate
*/
struct iwl_rate_scale_data {
u64 data; /* bitmap of successful frames */
s32 success_counter; /* number of frames successful */
s32 success_ratio; /* per-cent * 128 */
s32 counter; /* number of frames attempted */
s32 average_tpt; /* success ratio * expected throughput */
unsigned long stamp;
};
/**
* struct iwl_scale_tbl_info -- tx params and success history for all rates
*
* There are two of these in struct iwl_lq_sta,
* one for "active", and one for "search".
*/
struct iwl_scale_tbl_info {
enum iwl_table_type lq_type;
u8 ant_type;
u8 is_SGI; /* 1 = short guard interval */
u8 is_ht40; /* 1 = 40 MHz channel width */
u8 is_dup; /* 1 = duplicated data streams */
u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
u8 max_search; /* maximun number of tables we can search */
s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
u32 current_rate; /* rate_n_flags, uCode API format */
struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
};
struct iwl_traffic_load {
unsigned long time_stamp; /* age of the oldest statistics */
u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
* slice */
u32 total; /* total num of packets during the
* last TID_MAX_TIME_DIFF */
u8 queue_count; /* number of queues that has
* been used since the last cleanup */
u8 head; /* start of the circular buffer */
};
/**
* struct iwl_lq_sta -- driver's rate scaling private structure
*
* Pointer to this gets passed back and forth between driver and mac80211.
*/
struct iwl_lq_sta {
u8 active_tbl; /* index of active table, range 0-1 */
u8 enable_counter; /* indicates HT mode */
u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
u8 search_better_tbl; /* 1: currently trying alternate mode */
s32 last_tpt;
/* The following determine when to search for a new mode */
u32 table_count_limit;
u32 max_failure_limit; /* # failed frames before new search */
u32 max_success_limit; /* # successful frames before new search */
u32 table_count;
u32 total_failed; /* total failed frames, any/all rates */
u32 total_success; /* total successful frames, any/all rates */
u64 flush_timer; /* time staying in mode before new search */
u8 action_counter; /* # mode-switch actions tried */
u8 is_green;
u8 is_dup;
enum ieee80211_band band;
u8 ibss_sta_added;
/* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
u32 supp_rates;
u16 active_legacy_rate;
u16 active_siso_rate;
u16 active_mimo2_rate;
u16 active_mimo3_rate;
u16 active_rate_basic;
s8 max_rate_idx; /* Max rate set by user */
u8 missed_rate_counter;
struct iwl_link_quality_cmd lq;
struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
u8 tx_agg_tid_en;
#ifdef CONFIG_MAC80211_DEBUGFS
struct dentry *rs_sta_dbgfs_scale_table_file;
struct dentry *rs_sta_dbgfs_stats_table_file;
struct dentry *rs_sta_dbgfs_rate_scale_data_file;
struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
u32 dbg_fixed_rate;
#endif
struct iwl_priv *drv;
/* used to be in sta_info */
int last_txrate_idx;
/* last tx rate_n_flags */
u32 last_rate_n_flags;
};
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);
#ifdef CONFIG_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
/*
* Expected throughput metrics for following rates:
* 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
* "G" is the only table that supports CCK (the first 4 rates).
*/
static s32 expected_tpt_A[IWL_RATE_COUNT] = {
0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
};
static s32 expected_tpt_G[IWL_RATE_COUNT] = {
7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
};
static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
};
static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
};
static s32 expected_tpt_mimo2_20MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
};
static s32 expected_tpt_mimo2_20MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
};
static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
};
static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
};
static s32 expected_tpt_mimo2_40MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
};
static s32 expected_tpt_mimo2_40MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
};
/* Expected throughput metric MIMO3 */
static s32 expected_tpt_mimo3_20MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 99, 99, 153, 186, 208, 239, 256, 263, 268
};
static s32 expected_tpt_mimo3_20MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 106, 106, 162, 194, 215, 246, 262, 268, 273
};
static s32 expected_tpt_mimo3_40MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 152, 152, 211, 239, 255, 279, 290, 294, 297
};
static s32 expected_tpt_mimo3_40MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 160, 160, 219, 245, 261, 284, 294, 297, 300
};
/* mbps, mcs */
const static struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
{"1", ""},
{"2", ""},
{"5.5", ""},
{"11", ""},
{"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 inline u8 rs_extract_rate(u32 rate_n_flags)
{
return (u8)(rate_n_flags & 0xFF);
}
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 MAX_TID_COUNT;
if (unlikely(tid >= TID_MAX_LOAD_COUNT))
return 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 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;
}
/*
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 >= TID_MAX_LOAD_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 void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
struct iwl_lq_sta *lq_data, u8 tid,
struct ieee80211_sta *sta)
{
if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
sta->addr, tid);
ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
}
}
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 < TID_MAX_LOAD_COUNT))
rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
else if (tid == IWL_AGG_ALL_TID)
for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
if (priv->cfg->use_rts_for_ht) {
/*
* switch to RTS/CTS if it is the prefer protection method
* for HT traffic
*/
IWL_DEBUG_HT(priv, "use RTS/CTS protection for HT\n");
priv->staging_rxon.flags &= ~RXON_FLG_SELF_CTS_EN;
iwlcore_commit_rxon(priv);
}
}
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);
}
/**
* 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_rate_scale_data *windows,
int scale_index, s32 tpt, int retries,
int successes)
{
struct iwl_rate_scale_data *window = NULL;
static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
s32 fail_count;
if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
return -EINVAL;
/* Select data for current tx bit rate */
window = &(windows[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 (retries > 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 (throw away oldest history),
* OR in "1", and increment "success" if this
* frame was successful. */
window->data <<= 1;
if (successes > 0) {
window->success_counter++;
window->data |= 0x1;
successes--;
}
retries--;
}
/* 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;
*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 inline u8 rs_use_green(struct ieee80211_sta *sta,
struct iwl_ht_config *ht_conf)
{
return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
!(ht_conf->non_GF_STA_present);
}
/**
* 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 (hdr && is_multicast_ether_addr(hdr->addr1) &&
lq_sta->active_rate_basic)
return lq_sta->active_rate_basic;
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->hw_params.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);
}
/*
* 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 status;
u8 retries;
int rs_index, mac_index, index = 0;
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_priv *priv = (struct iwl_priv *)priv_r;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct iwl_rate_scale_data *window = NULL;
struct iwl_rate_scale_data *search_win = NULL;
enum mac80211_rate_control_flags mac_flags;
u32 tx_rate;
struct iwl_scale_tbl_info tbl_type;
struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
u8 active_index = 0;
s32 tpt = 0;
IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
if (!ieee80211_is_data(hdr->frame_control) ||
info->flags & IEEE80211_TX_CTL_NO_ACK)
return;
/* This packet was aggregated but doesn't carry rate scale info */
if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
!(info->flags & IEEE80211_TX_STAT_AMPDU))
return;
if (info->flags & IEEE80211_TX_STAT_AMPDU)
retries = 0;
else
retries = info->status.rates[0].count - 1;
if (retries > 15)
retries = 15;
if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
!lq_sta->ibss_sta_added)
goto out;
table = &lq_sta->lq;
active_index = lq_sta->active_tbl;
curr_tbl = &(lq_sta->lq_info[active_index]);
search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
/*
* 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).
*/
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;
}
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->antenna_sel_tx) ||
(!!(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);
/* the last LQ command could failed so the LQ in ucode not
* the same in driver sync up
*/
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, &lq_sta->lq, CMD_ASYNC);
}
goto out;
}
lq_sta->missed_rate_counter = 0;
/* Update frame history window with "failure" for each Tx retry. */
while (retries) {
/* Look up the rate and other info used for each tx attempt.
* Each tx attempt steps one entry deeper in the rate table. */
tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
rs_get_tbl_info_from_mcs(tx_rate, priv->band,
&tbl_type, &rs_index);
/* If type matches "search" table,
* add failure to "search" history */
if ((tbl_type.lq_type == search_tbl->lq_type) &&
(tbl_type.ant_type == search_tbl->ant_type) &&
(tbl_type.is_SGI == search_tbl->is_SGI)) {
if (search_tbl->expected_tpt)
tpt = search_tbl->expected_tpt[rs_index];
else
tpt = 0;
rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
/* Else if type matches "current/active" table,
* add failure to "current/active" history */
} else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
(tbl_type.ant_type == curr_tbl->ant_type) &&
(tbl_type.is_SGI == curr_tbl->is_SGI)) {
if (curr_tbl->expected_tpt)
tpt = curr_tbl->expected_tpt[rs_index];
else
tpt = 0;
rs_collect_tx_data(window, rs_index, tpt, 1, 0);
}
/* If not searching for a new mode, increment failed counter
* ... this helps determine when to start searching again */
if (lq_sta->stay_in_tbl)
lq_sta->total_failed++;
--retries;
index++;
}
/*
* Find (by rate) the history window to update with final Tx attempt;
* if Tx was successful first try, use original rate,
* else look up the rate that was, finally, successful.
*/
tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
lq_sta->last_rate_n_flags = tx_rate;
rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
/* Update frame history window with "success" if Tx got ACKed ... */
status = !!(info->flags & IEEE80211_TX_STAT_ACK);
/* If type matches "search" table,
* add final tx status to "search" history */
if ((tbl_type.lq_type == search_tbl->lq_type) &&
(tbl_type.ant_type == search_tbl->ant_type) &&
(tbl_type.is_SGI == search_tbl->is_SGI)) {
if (search_tbl->expected_tpt)
tpt = search_tbl->expected_tpt[rs_index];
else
tpt = 0;
if (info->flags & IEEE80211_TX_STAT_AMPDU)
rs_collect_tx_data(search_win, rs_index, tpt,
info->status.ampdu_ack_len,
info->status.ampdu_ack_map);
else
rs_collect_tx_data(search_win, rs_index, tpt,
1, status);
/* Else if type matches "current/active" table,
* add final tx status to "current/active" history */
} else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
(tbl_type.ant_type == curr_tbl->ant_type) &&
(tbl_type.is_SGI == curr_tbl->is_SGI)) {
if (curr_tbl->expected_tpt)
tpt = curr_tbl->expected_tpt[rs_index];
else
tpt = 0;
if (info->flags & IEEE80211_TX_STAT_AMPDU)
rs_collect_tx_data(window, rs_index, tpt,
info->status.ampdu_ack_len,
info->status.ampdu_ack_map);
else
rs_collect_tx_data(window, rs_index, tpt,
1, status);
}
/* If not searching for new mode, increment success/failed counter
* ... these help determine when to start searching again */
if (lq_sta->stay_in_tbl) {
if (info->flags & IEEE80211_TX_STAT_AMPDU) {
lq_sta->total_success += info->status.ampdu_ack_map;
lq_sta->total_failed +=
(info->status.ampdu_ack_len - info->status.ampdu_ack_map);
} else {
if (status)
lq_sta->total_success++;
else
lq_sta->total_failed++;
}
}
/* 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);
out:
return;
}
/*
* 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)
{
if (is_legacy(tbl->lq_type)) {
if (!is_a_band(tbl->lq_type))
tbl->expected_tpt = expected_tpt_G;
else
tbl->expected_tpt = expected_tpt_A;
} else if (is_siso(tbl->lq_type)) {
if (tbl->is_ht40 && !lq_sta->is_dup)
if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_siso40MHzSGI;
else
tbl->expected_tpt = expected_tpt_siso40MHz;
else if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_siso20MHzSGI;
else
tbl->expected_tpt = expected_tpt_siso20MHz;
} else if (is_mimo2(tbl->lq_type)) {
if (tbl->is_ht40 && !lq_sta->is_dup)
if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_mimo2_40MHzSGI;
else
tbl->expected_tpt = expected_tpt_mimo2_40MHz;
else if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_mimo2_20MHzSGI;
else
tbl->expected_tpt = expected_tpt_mimo2_20MHz;
} else if (is_mimo3(tbl->lq_type)) {
if (tbl->is_ht40 && !lq_sta->is_dup)
if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_mimo3_40MHzSGI;
else
tbl->expected_tpt = expected_tpt_mimo3_40MHz;
else if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_mimo3_20MHzSGI;
else
tbl->expected_tpt = expected_tpt_mimo3_20MHz;
} else
tbl->expected_tpt = expected_tpt_G;
}
/*
* 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 */
s32 *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;
if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
return -1;
if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
== WLAN_HT_CAP_SM_PS_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, &sta->ht_cap))
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;
if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
return -1;
if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
== WLAN_HT_CAP_SM_PS_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, &sta->ht_cap))
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;
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, &sta->ht_cap))
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 = tbl->action;
u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
u8 tx_chains_num = priv->hw_params.tx_chains_num;
int ret = 0;
u8 update_search_tbl_counter = 0;
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;
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)
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 = tbl->action;
u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
u8 tx_chains_num = priv->hw_params.tx_chains_num;
u8 update_search_tbl_counter = 0;
int ret;
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;
}
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)
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 = tbl->action;
u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
u8 tx_chains_num = priv->hw_params.tx_chains_num;
u8 update_search_tbl_counter = 0;
int ret;
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;
}
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 = tbl->action;
u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
u8 tx_chains_num = priv->hw_params.tx_chains_num;
int ret;
u8 update_search_tbl_counter = 0;
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;
}
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)
{
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 ((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
* return rate_n_flags as used in the table
*/
static u32 rs_update_rate_tbl(struct iwl_priv *priv,
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, &lq_sta->lq, CMD_ASYNC);
return rate;
}
/*
* 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;
u32 rate;
u8 is_green = 0;
u8 active_tbl = 0;
u8 done_search = 0;
u16 high_low;
s32 sr;
u8 tid = MAX_TID_COUNT;
struct iwl_tid_data *tid_data;
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;
if (!sta || !lq_sta)
return;
lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
tid = rs_tl_add_packet(lq_sta, hdr);
/*
* 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, &priv->current_ht_config);
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);
rate = rs_update_rate_tbl(priv, 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);
goto out;
}
/* Else we have enough samples; calculate estimate of
* actual average throughput */
BUG_ON(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;
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)
rate = rs_update_rate_tbl(priv, 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);
}
/*
* 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, &lq_sta->lq, CMD_ASYNC);
} 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 != MAX_TID_COUNT)) {
tid_data =
&priv->stations[lq_sta->lq.sta_id].tid[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);
i = index;
lq_sta->last_txrate_idx = i;
return;
}
static void rs_initialize_lq(struct iwl_priv *priv,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta,
struct iwl_lq_sta *lq_sta)
{
struct iwl_scale_tbl_info *tbl;
int rate_idx;
int i;
u32 rate;
u8 use_green = rs_use_green(sta, &priv->current_ht_config);
u8 active_tbl = 0;
u8 valid_tx_ant;
if (!sta || !lq_sta)
goto out;
i = lq_sta->last_txrate_idx;
if ((lq_sta->lq.sta_id == 0xff) &&
(priv->iw_mode == NL80211_IFTYPE_ADHOC))
goto out;
valid_tx_ant = priv->hw_params.valid_tx_ant;
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 ((i < 0) || (i >= IWL_RATE_COUNT))
i = 0;
rate = iwl_rates[i].plcp;
tbl->ant_type = first_antenna(valid_tx_ant);
rate |= tbl->ant_type << RATE_MCS_ANT_POS;
if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
rate |= RATE_MCS_CCK_MSK;
rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
rs_toggle_antenna(valid_tx_ant, &rate, tbl);
rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
tbl->current_rate = rate;
rs_set_expected_tpt_table(lq_sta, tbl);
rs_fill_link_cmd(NULL, lq_sta, rate);
iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
out:
return;
}
static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
struct ieee80211_tx_rate_control *txrc)
{
struct sk_buff *skb = txrc->skb;
struct ieee80211_supported_band *sband = txrc->sband;
struct iwl_priv *priv = (struct iwl_priv *)priv_r;
struct ieee80211_conf *conf = &priv->hw->conf;
struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct iwl_lq_sta *lq_sta = priv_sta;
int rate_idx;
IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
/* Get max rate if user set max rate */
if (lq_sta) {
lq_sta->max_rate_idx = txrc->max_rate_idx;
if ((sband->band == IEEE80211_BAND_5GHZ) &&
(lq_sta->max_rate_idx != -1))
lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
if ((lq_sta->max_rate_idx < 0) ||
(lq_sta->max_rate_idx >= IWL_RATE_COUNT))
lq_sta->max_rate_idx = -1;
}
/* Send management frames and NO_ACK data using lowest rate. */
if (rate_control_send_low(sta, priv_sta, txrc))
return;
rate_idx = lq_sta->last_txrate_idx;
if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
!lq_sta->ibss_sta_added) {
u8 sta_id = iwl_find_station(priv, hdr->addr1);
if (sta_id == IWL_INVALID_STATION) {
IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n",
hdr->addr1);
sta_id = iwl_add_station(priv, hdr->addr1,
false, CMD_ASYNC, ht_cap);
}
if ((sta_id != IWL_INVALID_STATION)) {
lq_sta->lq.sta_id = sta_id;
lq_sta->lq.rs_table[0].rate_n_flags = 0;
lq_sta->ibss_sta_added = 1;
rs_initialize_lq(priv, conf, sta, lq_sta);
}
}
if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
rate_idx -= IWL_FIRST_OFDM_RATE;
/* 6M and 9M shared same MCS index */
rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
IWL_RATE_MIMO3_6M_PLCP)
rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
IWL_RATE_MIMO2_6M_PLCP)
rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
} else {
/* Check for invalid rates */
if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
((sband->band == IEEE80211_BAND_5GHZ) &&
(rate_idx < IWL_FIRST_OFDM_RATE)))
rate_idx = rate_lowest_index(sband, sta);
/* On valid 5 GHz rate, adjust index */
else if (sband->band == IEEE80211_BAND_5GHZ)
rate_idx -= IWL_FIRST_OFDM_RATE;
info->control.rates[0].flags = 0;
}
info->control.rates[0].idx = rate_idx;
}
static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
gfp_t gfp)
{
struct iwl_lq_sta *lq_sta;
struct iwl_priv *priv;
int i, j;
priv = (struct iwl_priv *)priv_rate;
IWL_DEBUG_RATE(priv, "create station rate scale window\n");
lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
if (lq_sta == NULL)
return NULL;
lq_sta->lq.sta_id = 0xff;
for (j = 0; j < LQ_SIZE; j++)
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
return lq_sta;
}
static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta, void *priv_sta)
{
int i, j;
struct iwl_priv *priv = (struct iwl_priv *)priv_r;
struct ieee80211_conf *conf = &priv->hw->conf;
struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
struct iwl_lq_sta *lq_sta = priv_sta;
lq_sta->flush_timer = 0;
lq_sta->supp_rates = sta->supp_rates[sband->band];
for (j = 0; j < LQ_SIZE; j++)
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n");
/* TODO: what is a good starting rate for STA? About middle? Maybe not
* the lowest or the highest rate.. Could consider using RSSI from
* previous packets? Need to have IEEE 802.1X auth succeed immediately
* after assoc.. */
lq_sta->ibss_sta_added = 0;
if (priv->iw_mode == NL80211_IFTYPE_AP) {
u8 sta_id = iwl_find_station(priv,
sta->addr);
/* for IBSS the call are from tasklet */
IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
if (sta_id == IWL_INVALID_STATION) {
IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr);
sta_id = iwl_add_station(priv, sta->addr, false,
CMD_ASYNC, ht_cap);
}
if ((sta_id != IWL_INVALID_STATION)) {
lq_sta->lq.sta_id = sta_id;
lq_sta->lq.rs_table[0].rate_n_flags = 0;
}
/* FIXME: this is w/a remove it later */
priv->assoc_station_added = 1;
}
lq_sta->is_dup = 0;
lq_sta->max_rate_idx = -1;
lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
lq_sta->active_rate_basic = priv->active_rate_basic;
lq_sta->band = priv->band;
/*
* active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
* supp_rates[] does not; shift to convert format, force 9 MBits off.
*/
lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
lq_sta->active_siso_rate &= ~((u16)0x2);
lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
/* Same here */
lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
lq_sta->active_mimo2_rate &= ~((u16)0x2);
lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
lq_sta->active_mimo3_rate &= ~((u16)0x2);
lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
lq_sta->active_siso_rate,
lq_sta->active_mimo2_rate,
lq_sta->active_mimo3_rate);
/* These values will be overridden later */
lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
/* as default allow aggregation for all tids */
lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
lq_sta->drv = priv;
/* Set last_txrate_idx to lowest rate */
lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
if (sband->band == IEEE80211_BAND_5GHZ)
lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
rs_initialize_lq(priv, conf, sta, lq_sta);
}
static void rs_fill_link_cmd(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta, u32 new_rate)
{
struct iwl_scale_tbl_info tbl_type;
int index = 0;
int rate_idx;
int repeat_rate = 0;
u8 ant_toggle_cnt = 0;
u8 use_ht_possible = 1;
u8 valid_tx_ant = 0;
struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
/* Override starting rate (index 0) if needed for debug purposes */
rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
/* Interpret new_rate (rate_n_flags) */
memset(&tbl_type, 0, sizeof(tbl_type));
rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
&tbl_type, &rate_idx);
/* How many times should we repeat the initial rate? */
if (is_legacy(tbl_type.lq_type)) {
ant_toggle_cnt = 1;
repeat_rate = IWL_NUMBER_TRY;
} else {
repeat_rate = IWL_HT_NUMBER_TRY;
}
lq_cmd->general_params.mimo_delimiter =
is_mimo(tbl_type.lq_type) ? 1 : 0;
/* Fill 1st table entry (index 0) */
lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
if (num_of_ant(tbl_type.ant_type) == 1) {
lq_cmd->general_params.single_stream_ant_msk =
tbl_type.ant_type;
} else if (num_of_ant(tbl_type.ant_type) == 2) {
lq_cmd->general_params.dual_stream_ant_msk =
tbl_type.ant_type;
} /* otherwise we don't modify the existing value */
index++;
repeat_rate--;
if (priv)
valid_tx_ant = priv->hw_params.valid_tx_ant;
/* Fill rest of rate table */
while (index < LINK_QUAL_MAX_RETRY_NUM) {
/* Repeat initial/next rate.
* For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
* For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
if (is_legacy(tbl_type.lq_type)) {
if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
ant_toggle_cnt++;
else if (priv &&
rs_toggle_antenna(valid_tx_ant,
&new_rate, &tbl_type))
ant_toggle_cnt = 1;
}
/* Override next rate if needed for debug purposes */
rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
/* Fill next table entry */
lq_cmd->rs_table[index].rate_n_flags =
cpu_to_le32(new_rate);
repeat_rate--;
index++;
}
rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
&rate_idx);
/* Indicate to uCode which entries might be MIMO.
* If initial rate was MIMO, this will finally end up
* as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
if (is_mimo(tbl_type.lq_type))
lq_cmd->general_params.mimo_delimiter = index;
/* Get next rate */
new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
use_ht_possible);
/* How many times should we repeat the next rate? */
if (is_legacy(tbl_type.lq_type)) {
if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
ant_toggle_cnt++;
else if (priv &&
rs_toggle_antenna(valid_tx_ant,
&new_rate, &tbl_type))
ant_toggle_cnt = 1;
repeat_rate = IWL_NUMBER_TRY;
} else {
repeat_rate = IWL_HT_NUMBER_TRY;
}
/* Don't allow HT rates after next pass.
* rs_get_lower_rate() will change type to LQ_A or LQ_G. */
use_ht_possible = 0;
/* Override next rate if needed for debug purposes */
rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
/* Fill next table entry */
lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
index++;
repeat_rate--;
}
lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_MAX;
lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
lq_cmd->agg_params.agg_time_limit =
cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
}
static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
{
return hw->priv;
}
/* rate scale requires free function to be implemented */
static void rs_free(void *priv_rate)
{
return;
}
static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
void *priv_sta)
{
struct iwl_lq_sta *lq_sta = priv_sta;
struct iwl_priv *priv __maybe_unused = priv_r;
IWL_DEBUG_RATE(priv, "enter\n");
kfree(lq_sta);
IWL_DEBUG_RATE(priv, "leave\n");
}
#ifdef CONFIG_MAC80211_DEBUGFS
static int open_file_generic(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
u32 *rate_n_flags, int index)
{
struct iwl_priv *priv;
u8 valid_tx_ant;
u8 ant_sel_tx;
priv = lq_sta->drv;
valid_tx_ant = priv->hw_params.valid_tx_ant;
if (lq_sta->dbg_fixed_rate) {
ant_sel_tx =
((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
>> RATE_MCS_ANT_POS);
if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
*rate_n_flags = lq_sta->dbg_fixed_rate;
IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
} else {
lq_sta->dbg_fixed_rate = 0;
IWL_ERR(priv,
"Invalid antenna selection 0x%X, Valid is 0x%X\n",
ant_sel_tx, valid_tx_ant);
IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
}
} else {
IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
}
}
static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
const char __user *user_buf, size_t count, loff_t *ppos)
{
struct iwl_lq_sta *lq_sta = file->private_data;
struct iwl_priv *priv;
char buf[64];
int buf_size;
u32 parsed_rate;
priv = lq_sta->drv;
memset(buf, 0, sizeof(buf));
buf_size = min(count, sizeof(buf) - 1);
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
if (sscanf(buf, "%x", &parsed_rate) == 1)
lq_sta->dbg_fixed_rate = parsed_rate;
else
lq_sta->dbg_fixed_rate = 0;
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, &lq_sta->lq, CMD_ASYNC);
}
return count;
}
static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
char __user *user_buf, size_t count, loff_t *ppos)
{
char *buff;
int desc = 0;
int i = 0;
int index = 0;
ssize_t ret;
struct iwl_lq_sta *lq_sta = file->private_data;
struct iwl_priv *priv;
struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
priv = lq_sta->drv;
buff = kmalloc(1024, GFP_KERNEL);
if (!buff)
return -ENOMEM;
desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
lq_sta->total_failed, lq_sta->total_success,
lq_sta->active_legacy_rate);
desc += sprintf(buff+desc, "fixed rate 0x%X\n",
lq_sta->dbg_fixed_rate);
desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
(priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
(priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
(priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
desc += sprintf(buff+desc, "lq type %s\n",
(is_legacy(tbl->lq_type)) ? "legacy" : "HT");
if (is_Ht(tbl->lq_type)) {
desc += sprintf(buff+desc, " %s",
(is_siso(tbl->lq_type)) ? "SISO" :
((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
desc += sprintf(buff+desc, " %s",
(tbl->is_ht40) ? "40MHz" : "20MHz");
desc += sprintf(buff+desc, " %s %s\n", (tbl->is_SGI) ? "SGI" : "",
(lq_sta->is_green) ? "GF enabled" : "");
}
desc += sprintf(buff+desc, "last tx rate=0x%X\n",
lq_sta->last_rate_n_flags);
desc += sprintf(buff+desc, "general:"
"flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
lq_sta->lq.general_params.flags,
lq_sta->lq.general_params.mimo_delimiter,
lq_sta->lq.general_params.single_stream_ant_msk,
lq_sta->lq.general_params.dual_stream_ant_msk);
desc += sprintf(buff+desc, "agg:"
"time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
lq_sta->lq.agg_params.agg_dis_start_th,
lq_sta->lq.agg_params.agg_frame_cnt_limit);
desc += sprintf(buff+desc,
"Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
lq_sta->lq.general_params.start_rate_index[0],
lq_sta->lq.general_params.start_rate_index[1],
lq_sta->lq.general_params.start_rate_index[2],
lq_sta->lq.general_params.start_rate_index[3]);
for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
index = iwl_hwrate_to_plcp_idx(
le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
if (is_legacy(tbl->lq_type)) {
desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
iwl_rate_mcs[index].mbps);
} else {
desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
}
}
ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
kfree(buff);
return ret;
}
static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
.write = rs_sta_dbgfs_scale_table_write,
.read = rs_sta_dbgfs_scale_table_read,
.open = open_file_generic,
};
static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
char __user *user_buf, size_t count, loff_t *ppos)
{
char *buff;
int desc = 0;
int i, j;
ssize_t ret;
struct iwl_lq_sta *lq_sta = file->private_data;
buff = kmalloc(1024, GFP_KERNEL);
if (!buff)
return -ENOMEM;
for (i = 0; i < LQ_SIZE; i++) {
desc += sprintf(buff+desc,
"%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
"rate=0x%X\n",
lq_sta->active_tbl == i ? "*" : "x",
lq_sta->lq_info[i].lq_type,
lq_sta->lq_info[i].is_SGI,
lq_sta->lq_info[i].is_ht40,
lq_sta->lq_info[i].is_dup,
lq_sta->is_green,
lq_sta->lq_info[i].current_rate);
for (j = 0; j < IWL_RATE_COUNT; j++) {
desc += sprintf(buff+desc,
"counter=%d success=%d %%=%d\n",
lq_sta->lq_info[i].win[j].counter,
lq_sta->lq_info[i].win[j].success_counter,
lq_sta->lq_info[i].win[j].success_ratio);
}
}
ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
kfree(buff);
return ret;
}
static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
.read = rs_sta_dbgfs_stats_table_read,
.open = open_file_generic,
};
static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
char __user *user_buf, size_t count, loff_t *ppos)
{
char buff[120];
int desc = 0;
ssize_t ret;
struct iwl_lq_sta *lq_sta = file->private_data;
struct iwl_priv *priv;
struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
priv = lq_sta->drv;
if (is_Ht(tbl->lq_type))
desc += sprintf(buff+desc,
"Bit Rate= %d Mb/s\n",
tbl->expected_tpt[lq_sta->last_txrate_idx]);
else
desc += sprintf(buff+desc,
"Bit Rate= %d Mb/s\n",
iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
desc += sprintf(buff+desc,
"Signal Level= %d dBm\tNoise Level= %d dBm\n",
priv->last_rx_rssi, priv->last_rx_noise);
desc += sprintf(buff+desc,
"Tsf= 0x%llx\tBeacon time= 0x%08X\n",
priv->last_tsf, priv->last_beacon_time);
ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
return ret;
}
static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
.read = rs_sta_dbgfs_rate_scale_data_read,
.open = open_file_generic,
};
static void rs_add_debugfs(void *priv, void *priv_sta,
struct dentry *dir)
{
struct iwl_lq_sta *lq_sta = priv_sta;
lq_sta->rs_sta_dbgfs_scale_table_file =
debugfs_create_file("rate_scale_table", 0600, dir,
lq_sta, &rs_sta_dbgfs_scale_table_ops);
lq_sta->rs_sta_dbgfs_stats_table_file =
debugfs_create_file("rate_stats_table", 0600, dir,
lq_sta, &rs_sta_dbgfs_stats_table_ops);
lq_sta->rs_sta_dbgfs_rate_scale_data_file =
debugfs_create_file("rate_scale_data", 0600, dir,
lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
&lq_sta->tx_agg_tid_en);
}
static void rs_remove_debugfs(void *priv, void *priv_sta)
{
struct iwl_lq_sta *lq_sta = priv_sta;
debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
}
#endif
static struct rate_control_ops rs_ops = {
.module = NULL,
.name = RS_NAME,
.tx_status = rs_tx_status,
.get_rate = rs_get_rate,
.rate_init = rs_rate_init,
.alloc = rs_alloc,
.free = rs_free,
.alloc_sta = rs_alloc_sta,
.free_sta = rs_free_sta,
#ifdef CONFIG_MAC80211_DEBUGFS
.add_sta_debugfs = rs_add_debugfs,
.remove_sta_debugfs = rs_remove_debugfs,
#endif
};
int iwlagn_rate_control_register(void)
{
return ieee80211_rate_control_register(&rs_ops);
}
void iwlagn_rate_control_unregister(void)
{
ieee80211_rate_control_unregister(&rs_ops);
}
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