blob: 405bbab379265d3a9e06eefe2c309cf293dfd1a5 [file] [log] [blame]
/******************************************************************************
*
* Copyright(c) 2005 - 2011 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 "common.h"
#include "4965.h"
#define IL4965_RS_NAME "iwl-4965-rs"
#define NUM_TRY_BEFORE_ANT_TOGGLE 1
#define IL_NUMBER_TRY 1
#define IL_HT_NUMBER_TRY 3
#define RATE_MAX_WINDOW 62 /* # tx in history win */
#define RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
#define RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
/* max allowed rate miss before sync LQ cmd */
#define IL_MISSED_RATE_MAX 15
/* max time to accum history 2 seconds */
#define RATE_SCALE_FLUSH_INTVL (3*HZ)
static u8 rs_ht_to_legacy[] = {
RATE_6M_IDX, RATE_6M_IDX,
RATE_6M_IDX, RATE_6M_IDX,
RATE_6M_IDX,
RATE_6M_IDX, RATE_9M_IDX,
RATE_12M_IDX, RATE_18M_IDX,
RATE_24M_IDX, RATE_36M_IDX,
RATE_48M_IDX, RATE_54M_IDX
};
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 IL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
[RATE_##r##M_IDX] = { RATE_##r##M_PLCP, \
RATE_SISO_##s##M_PLCP, \
RATE_MIMO2_##s##M_PLCP,\
RATE_##r##M_IEEE, \
RATE_##ip##M_IDX, \
RATE_##in##M_IDX, \
RATE_##rp##M_IDX, \
RATE_##rn##M_IDX, \
RATE_##pp##M_IDX, \
RATE_##np##M_IDX }
/*
* 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 RATE_INVALID
*
*/
const struct il_rate_info il_rates[RATE_COUNT] = {
IL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
IL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
IL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
IL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
IL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
IL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
IL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
IL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
IL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
IL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
IL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
IL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
IL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
};
static int
il4965_hwrate_to_plcp_idx(u32 rate_n_flags)
{
int idx = 0;
/* HT rate format */
if (rate_n_flags & RATE_MCS_HT_MSK) {
idx = (rate_n_flags & 0xff);
if (idx >= RATE_MIMO2_6M_PLCP)
idx = idx - RATE_MIMO2_6M_PLCP;
idx += IL_FIRST_OFDM_RATE;
/* skip 9M not supported in ht */
if (idx >= RATE_9M_IDX)
idx += 1;
if (idx >= IL_FIRST_OFDM_RATE && idx <= IL_LAST_OFDM_RATE)
return idx;
/* legacy rate format, search for match in table */
} else {
for (idx = 0; idx < ARRAY_SIZE(il_rates); idx++)
if (il_rates[idx].plcp == (rate_n_flags & 0xFF))
return idx;
}
return -1;
}
static void il4965_rs_rate_scale_perform(struct il_priv *il,
struct sk_buff *skb,
struct ieee80211_sta *sta,
struct il_lq_sta *lq_sta);
static void il4965_rs_fill_link_cmd(struct il_priv *il,
struct il_lq_sta *lq_sta, u32 rate_n_flags);
static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta,
bool force_search);
#ifdef CPTCFG_MAC80211_DEBUGFS
static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta,
u32 *rate_n_flags, int idx);
#else
static void
il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
{
}
#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 s32 expected_tpt_legacy[RATE_COUNT] = {
7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
};
static s32 expected_tpt_siso20MHz[4][RATE_COUNT] = {
{0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
{0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
{0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
{0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
};
static s32 expected_tpt_siso40MHz[4][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, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
{0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
};
static s32 expected_tpt_mimo2_20MHz[4][RATE_COUNT] = {
{0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
{0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
{0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
{0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI */
};
static s32 expected_tpt_mimo2_40MHz[4][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, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
{0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
};
/* mbps, mcs */
static const struct il_rate_mcs_info il_rate_mcs[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_IDX_PER_STREAM (8)
static inline u8
il4965_rs_extract_rate(u32 rate_n_flags)
{
return (u8) (rate_n_flags & 0xFF);
}
static void
il4965_rs_rate_scale_clear_win(struct il_rate_scale_data *win)
{
win->data = 0;
win->success_counter = 0;
win->success_ratio = IL_INVALID_VALUE;
win->counter = 0;
win->average_tpt = IL_INVALID_VALUE;
win->stamp = 0;
}
static inline u8
il4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
{
return (ant_type & valid_antenna) == ant_type;
}
/*
* removes the old data from the stats. All data that is older than
* TID_MAX_TIME_DIFF, will be deleted.
*/
static void
il4965_rs_tl_rm_old_stats(struct il_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
il4965_rs_tl_add_packet(struct il_lq_sta *lq_data, struct ieee80211_hdr *hdr)
{
u32 curr_time = jiffies_to_msecs(jiffies);
u32 time_diff;
s32 idx;
struct il_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);
idx = time_diff / TID_QUEUE_CELL_SPACING;
/* The history is too long: remove data that is older than */
/* TID_MAX_TIME_DIFF */
if (idx >= TID_QUEUE_MAX_SIZE)
il4965_rs_tl_rm_old_stats(tl, curr_time);
idx = (tl->head + idx) % TID_QUEUE_MAX_SIZE;
tl->packet_count[idx] = tl->packet_count[idx] + 1;
tl->total = tl->total + 1;
if ((idx + 1) > tl->queue_count)
tl->queue_count = idx + 1;
return tid;
}
/*
get the traffic load value for tid
*/
static u32
il4965_rs_tl_get_load(struct il_lq_sta *lq_data, u8 tid)
{
u32 curr_time = jiffies_to_msecs(jiffies);
u32 time_diff;
s32 idx;
struct il_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);
idx = time_diff / TID_QUEUE_CELL_SPACING;
/* The history is too long: remove data that is older than */
/* TID_MAX_TIME_DIFF */
if (idx >= TID_QUEUE_MAX_SIZE)
il4965_rs_tl_rm_old_stats(tl, curr_time);
return tl->total;
}
static int
il4965_rs_tl_turn_on_agg_for_tid(struct il_priv *il, struct il_lq_sta *lq_data,
u8 tid, struct ieee80211_sta *sta)
{
int ret = -EAGAIN;
u32 load;
load = il4965_rs_tl_get_load(lq_data, tid);
if (load > IL_AGG_LOAD_THRESHOLD) {
D_HT("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
*/
IL_ERR("Fail start Tx agg on tid: %d\n", tid);
ieee80211_stop_tx_ba_session(sta, tid);
}
} else
D_HT("Aggregation not enabled for tid %d because load = %u\n",
tid, load);
return ret;
}
static void
il4965_rs_tl_turn_on_agg(struct il_priv *il, u8 tid, struct il_lq_sta *lq_data,
struct ieee80211_sta *sta)
{
if (tid < TID_MAX_LOAD_COUNT)
il4965_rs_tl_turn_on_agg_for_tid(il, lq_data, tid, sta);
else
IL_ERR("tid exceeds max load count: %d/%d\n", tid,
TID_MAX_LOAD_COUNT);
}
static inline int
il4965_get_il4965_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 il_scale_tbl_info
* that wraps a NULL pointer check
*/
static s32
il4965_get_expected_tpt(struct il_scale_tbl_info *tbl, int rs_idx)
{
if (tbl->expected_tpt)
return tbl->expected_tpt[rs_idx];
return 0;
}
/**
* il4965_rs_collect_tx_data - Update the success/failure sliding win
*
* We keep a sliding win of the last 62 packets transmitted
* at this rate. win->data contains the bitmask of successful
* packets.
*/
static int
il4965_rs_collect_tx_data(struct il_scale_tbl_info *tbl, int scale_idx,
int attempts, int successes)
{
struct il_rate_scale_data *win = NULL;
static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1));
s32 fail_count, tpt;
if (scale_idx < 0 || scale_idx >= RATE_COUNT)
return -EINVAL;
/* Select win for current tx bit rate */
win = &(tbl->win[scale_idx]);
/* Get expected throughput */
tpt = il4965_get_expected_tpt(tbl, scale_idx);
/*
* Keep track of only the latest 62 tx frame attempts in this rate's
* history win; anything older isn't really relevant any more.
* If we have filled up the sliding win, 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 (win->counter >= RATE_MAX_WINDOW) {
/* remove earliest */
win->counter = RATE_MAX_WINDOW - 1;
if (win->data & mask) {
win->data &= ~mask;
win->success_counter--;
}
}
/* Increment frames-attempted counter */
win->counter++;
/* Shift bitmap by one frame to throw away oldest history */
win->data <<= 1;
/* Mark the most recent #successes attempts as successful */
if (successes > 0) {
win->success_counter++;
win->data |= 0x1;
successes--;
}
attempts--;
}
/* Calculate current success ratio, avoid divide-by-0! */
if (win->counter > 0)
win->success_ratio =
128 * (100 * win->success_counter) / win->counter;
else
win->success_ratio = IL_INVALID_VALUE;
fail_count = win->counter - win->success_counter;
/* Calculate average throughput, if we have enough history. */
if (fail_count >= RATE_MIN_FAILURE_TH ||
win->success_counter >= RATE_MIN_SUCCESS_TH)
win->average_tpt = (win->success_ratio * tpt + 64) / 128;
else
win->average_tpt = IL_INVALID_VALUE;
/* Tag this win as having been updated */
win->stamp = jiffies;
return 0;
}
/*
* Fill uCode API rate_n_flags field, based on "search" or "active" table.
*/
static u32
il4965_rate_n_flags_from_tbl(struct il_priv *il, struct il_scale_tbl_info *tbl,
int idx, u8 use_green)
{
u32 rate_n_flags = 0;
if (is_legacy(tbl->lq_type)) {
rate_n_flags = il_rates[idx].plcp;
if (idx >= IL_FIRST_CCK_RATE && idx <= IL_LAST_CCK_RATE)
rate_n_flags |= RATE_MCS_CCK_MSK;
} else if (is_Ht(tbl->lq_type)) {
if (idx > IL_LAST_OFDM_RATE) {
IL_ERR("Invalid HT rate idx %d\n", idx);
idx = IL_LAST_OFDM_RATE;
}
rate_n_flags = RATE_MCS_HT_MSK;
if (is_siso(tbl->lq_type))
rate_n_flags |= il_rates[idx].plcp_siso;
else
rate_n_flags |= il_rates[idx].plcp_mimo2;
} else {
IL_ERR("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;
IL_ERR("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
il4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
enum ieee80211_band band,
struct il_scale_tbl_info *tbl, int *rate_idx)
{
u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
u8 il4965_num_of_ant =
il4965_get_il4965_num_of_ant_from_rate(rate_n_flags);
u8 mcs;
memset(tbl, 0, sizeof(struct il_scale_tbl_info));
*rate_idx = il4965_hwrate_to_plcp_idx(rate_n_flags);
if (*rate_idx == 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 = IL_MAX_SEARCH;
/* legacy rate format */
if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
if (il4965_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 = il4965_rs_extract_rate(rate_n_flags);
/* SISO */
if (mcs <= RATE_SISO_60M_PLCP) {
if (il4965_num_of_ant == 1)
tbl->lq_type = LQ_SISO; /*else NONE */
/* MIMO2 */
} else {
if (il4965_num_of_ant == 2)
tbl->lq_type = LQ_MIMO2;
}
}
return 0;
}
/* switch to another antenna/antennas and return 1 */
/* if no other valid antenna found, return 0 */
static int
il4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
struct il_scale_tbl_info *tbl)
{
u8 new_ant_type;
if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
return 0;
if (!il4965_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 &&
!il4965_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
il4965_rs_use_green(struct il_priv *il, struct ieee80211_sta *sta)
{
return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
!il->ht.non_gf_sta_present;
}
/**
* il4965_rs_get_supported_rates - get the available rates
*
* if management frame or broadcast frame only return
* basic available rates.
*
*/
static u16
il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta,
struct ieee80211_hdr *hdr,
enum il_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
return lq_sta->active_mimo2_rate;
}
}
static u16
il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask,
int rate_type)
{
u8 high = RATE_INVALID;
u8 low = 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 = idx - 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 = idx + 1;
for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) {
if (rate_mask & mask) {
high = i;
break;
}
}
return (high << 8) | low;
}
low = idx;
while (low != RATE_INVALID) {
low = il_rates[low].prev_rs;
if (low == RATE_INVALID)
break;
if (rate_mask & (1 << low))
break;
D_RATE("Skipping masked lower rate: %d\n", low);
}
high = idx;
while (high != RATE_INVALID) {
high = il_rates[high].next_rs;
if (high == RATE_INVALID)
break;
if (rate_mask & (1 << high))
break;
D_RATE("Skipping masked higher rate: %d\n", high);
}
return (high << 8) | low;
}
static u32
il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta,
struct il_scale_tbl_info *tbl, u8 scale_idx,
u8 ht_possible)
{
s32 low;
u16 rate_mask;
u16 high_low;
u8 switch_to_legacy = 0;
u8 is_green = lq_sta->is_green;
struct il_priv *il = 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_idx)) {
switch_to_legacy = 1;
scale_idx = rs_ht_to_legacy[scale_idx];
if (lq_sta->band == IEEE80211_BAND_5GHZ)
tbl->lq_type = LQ_A;
else
tbl->lq_type = LQ_G;
if (il4965_num_of_ant(tbl->ant_type) > 1)
tbl->ant_type =
il4965_first_antenna(il->hw_params.valid_tx_ant);
tbl->is_ht40 = 0;
tbl->is_SGI = 0;
tbl->max_search = IL_MAX_SEARCH;
}
rate_mask = il4965_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 << IL_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_idx))) {
low = scale_idx;
goto out;
}
high_low =
il4965_rs_get_adjacent_rate(lq_sta->drv, scale_idx, rate_mask,
tbl->lq_type);
low = high_low & 0xff;
if (low == RATE_INVALID)
low = scale_idx;
out:
return il4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
}
/*
* Simple function to compare two rate scale table types
*/
static bool
il4965_table_type_matches(struct il_scale_tbl_info *a,
struct il_scale_tbl_info *b)
{
return (a->lq_type == b->lq_type && a->ant_type == b->ant_type &&
a->is_SGI == b->is_SGI);
}
/*
* mac80211 sends us Tx status
*/
static void
il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta, void *il_sta,
struct sk_buff *skb)
{
int legacy_success;
int retries;
int rs_idx, mac_idx, i;
struct il_lq_sta *lq_sta = il_sta;
struct il_link_quality_cmd *table;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct il_priv *il = (struct il_priv *)il_r;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
enum mac80211_rate_control_flags mac_flags;
u32 tx_rate;
struct il_scale_tbl_info tbl_type;
struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
D_RATE("get frame ack response, update rate scale win\n");
/* Treat uninitialized rate scaling data same as non-existing. */
if (!lq_sta) {
D_RATE("Station rate scaling not created yet.\n");
return;
} else if (!lq_sta->drv) {
D_RATE("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);
il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx);
if (il->band == IEEE80211_BAND_5GHZ)
rs_idx -= IL_FIRST_OFDM_RATE;
mac_flags = info->status.rates[0].flags;
mac_idx = info->status.rates[0].idx;
/* For HT packets, map MCS to PLCP */
if (mac_flags & IEEE80211_TX_RC_MCS) {
mac_idx &= RATE_MCS_CODE_MSK; /* Remove # of streams */
if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE))
mac_idx++;
/*
* mac80211 HT idx is always zero-idxed; we need to move
* HT OFDM rates after CCK rates in 2.4 GHz band
*/
if (il->band == IEEE80211_BAND_2GHZ)
mac_idx += IL_FIRST_OFDM_RATE;
}
/* Here we actually compare this rate to the latest LQ command */
if (mac_idx < 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_idx != mac_idx) {
D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx,
rs_idx, tx_rate);
/*
* Since rates mis-match, the last LQ command may have failed.
* After IL_MISSED_RATE_MAX mis-matches, resync the uCode with
* ... driver.
*/
lq_sta->missed_rate_counter++;
if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) {
lq_sta->missed_rate_counter = 0;
il_send_lq_cmd(il, &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 (il4965_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 (il4965_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 {
D_RATE("Neither active nor search matches tx rate\n");
tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
D_RATE("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]);
D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
tmp_tbl->ant_type, tmp_tbl->is_SGI);
D_RATE("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
*/
il4965_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 idx into rate scale table.
*/
if (info->flags & IEEE80211_TX_STAT_AMPDU) {
tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type,
&rs_idx);
il4965_rs_collect_tx_data(curr_tbl, rs_idx,
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);
il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band,
&tbl_type, &rs_idx);
/*
* Only collect stats if retried rate is in the same RS
* table as active/search.
*/
if (il4965_table_type_matches(&tbl_type, curr_tbl))
tmp_tbl = curr_tbl;
else if (il4965_table_type_matches
(&tbl_type, other_tbl))
tmp_tbl = other_tbl;
else
continue;
il4965_rs_collect_tx_data(tmp_tbl, rs_idx, 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->supp_rates[sband->band])
il4965_rs_rate_scale_perform(il, skb, sta, 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 stats.
* These control how long we stay using same modulation mode before
* searching for a new mode.
*/
static void
il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy,
struct il_lq_sta *lq_sta)
{
D_RATE("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 = IL_LEGACY_TBL_COUNT;
lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT;
lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT;
} else {
lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT;
lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT;
lq_sta->max_success_limit = IL_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
il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta,
struct il_scale_tbl_info *tbl)
{
/* Used to choose among HT tables */
s32(*ht_tbl_pointer)[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), 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)) <-- must be true */
ht_tbl_pointer = expected_tpt_mimo2_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
il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta,
struct il_scale_tbl_info *tbl, /* "search" */
u16 rate_mask, s8 idx)
{
/* "active" values */
struct il_scale_tbl_info *active_tbl =
&(lq_sta->lq_info[lq_sta->active_tbl]);
s32 active_sr = active_tbl->win[idx].success_ratio;
s32 active_tpt = active_tbl->expected_tpt[idx];
/* expected "search" throughput */
s32 *tpt_tbl = tbl->expected_tpt;
s32 new_rate, high, low, start_hi;
u16 high_low;
s8 rate = idx;
new_rate = high = low = start_hi = RATE_INVALID;
for (;;) {
high_low =
il4965_rs_get_adjacent_rate(il, 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 > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH
&& tpt_tbl[rate] <= active_tpt)) ||
(active_sr >= 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 != RATE_INVALID) {
new_rate = start_hi;
break;
}
new_rate = rate;
/* Loop again with lower rate */
if (low != 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 != RATE_INVALID)
break;
/* Loop again with higher rate */
else if (high != 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
il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta,
struct il_scale_tbl_info *tbl, int idx)
{
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->smps_mode == IEEE80211_SMPS_STATIC)
return -1;
/* Need both Tx chains/antennas to support MIMO */
if (il->hw_params.tx_chains_num < 2)
return -1;
D_RATE("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 = IL_MAX_SEARCH;
rate_mask = lq_sta->active_mimo2_rate;
if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
tbl->is_ht40 = 1;
else
tbl->is_ht40 = 0;
il4965_rs_set_expected_tpt_table(lq_sta, tbl);
rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
D_RATE("Can't switch with idx %d rate mask %x\n", rate,
rate_mask);
return -1;
}
tbl->current_rate =
il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
is_green);
return 0;
}
/*
* Set up search table for SISO
*/
static int
il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta,
struct ieee80211_conf *conf, struct ieee80211_sta *sta,
struct il_scale_tbl_info *tbl, int idx)
{
u16 rate_mask;
u8 is_green = lq_sta->is_green;
s32 rate;
if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
return -1;
D_RATE("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 = IL_MAX_SEARCH;
rate_mask = lq_sta->active_siso_rate;
if (il_is_ht40_tx_allowed(il, &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 */
il4965_rs_set_expected_tpt_table(lq_sta, tbl);
rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
D_RATE("can not switch with idx %d rate mask %x\n", rate,
rate_mask);
return -1;
}
tbl->current_rate =
il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
is_green);
return 0;
}
/*
* Try to switch to new modulation mode from legacy
*/
static int
il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta, int idx)
{
struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
struct il_scale_tbl_info *search_tbl =
&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
struct il_rate_scale_data *win = &(tbl->win[idx]);
u32 sz =
(sizeof(struct il_scale_tbl_info) -
(sizeof(struct il_rate_scale_data) * RATE_COUNT));
u8 start_action;
u8 valid_tx_ant = il->hw_params.valid_tx_ant;
u8 tx_chains_num = il->hw_params.tx_chains_num;
int ret = 0;
u8 update_search_tbl_counter = 0;
tbl->action = IL_LEGACY_SWITCH_SISO;
start_action = tbl->action;
for (;;) {
lq_sta->action_counter++;
switch (tbl->action) {
case IL_LEGACY_SWITCH_ANTENNA1:
case IL_LEGACY_SWITCH_ANTENNA2:
D_RATE("LQ: Legacy toggle Antenna\n");
if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 &&
tx_chains_num <= 1) ||
(tbl->action == IL_LEGACY_SWITCH_ANTENNA2 &&
tx_chains_num <= 2))
break;
/* Don't change antenna if success has been great */
if (win->success_ratio >= IL_RS_GOOD_RATIO)
break;
/* Set up search table to try other antenna */
memcpy(search_tbl, tbl, sz);
if (il4965_rs_toggle_antenna
(valid_tx_ant, &search_tbl->current_rate,
search_tbl)) {
update_search_tbl_counter = 1;
il4965_rs_set_expected_tpt_table(lq_sta,
search_tbl);
goto out;
}
break;
case IL_LEGACY_SWITCH_SISO:
D_RATE("LQ: Legacy switch to SISO\n");
/* Set up search table to try SISO */
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
ret =
il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
search_tbl, idx);
if (!ret) {
lq_sta->action_counter = 0;
goto out;
}
break;
case IL_LEGACY_SWITCH_MIMO2_AB:
case IL_LEGACY_SWITCH_MIMO2_AC:
case IL_LEGACY_SWITCH_MIMO2_BC:
D_RATE("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 == IL_LEGACY_SWITCH_MIMO2_AB)
search_tbl->ant_type = ANT_AB;
else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC)
search_tbl->ant_type = ANT_AC;
else
search_tbl->ant_type = ANT_BC;
if (!il4965_rs_is_valid_ant
(valid_tx_ant, search_tbl->ant_type))
break;
ret =
il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
search_tbl, idx);
if (!ret) {
lq_sta->action_counter = 0;
goto out;
}
break;
}
tbl->action++;
if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
tbl->action = IL_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 > IL_LEGACY_SWITCH_MIMO2_BC)
tbl->action = IL_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
il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta, int idx)
{
u8 is_green = lq_sta->is_green;
struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
struct il_scale_tbl_info *search_tbl =
&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
struct il_rate_scale_data *win = &(tbl->win[idx]);
struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
u32 sz =
(sizeof(struct il_scale_tbl_info) -
(sizeof(struct il_rate_scale_data) * RATE_COUNT));
u8 start_action;
u8 valid_tx_ant = il->hw_params.valid_tx_ant;
u8 tx_chains_num = il->hw_params.tx_chains_num;
u8 update_search_tbl_counter = 0;
int ret;
start_action = tbl->action;
for (;;) {
lq_sta->action_counter++;
switch (tbl->action) {
case IL_SISO_SWITCH_ANTENNA1:
case IL_SISO_SWITCH_ANTENNA2:
D_RATE("LQ: SISO toggle Antenna\n");
if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 &&
tx_chains_num <= 1) ||
(tbl->action == IL_SISO_SWITCH_ANTENNA2 &&
tx_chains_num <= 2))
break;
if (win->success_ratio >= IL_RS_GOOD_RATIO)
break;
memcpy(search_tbl, tbl, sz);
if (il4965_rs_toggle_antenna
(valid_tx_ant, &search_tbl->current_rate,
search_tbl)) {
update_search_tbl_counter = 1;
goto out;
}
break;
case IL_SISO_SWITCH_MIMO2_AB:
case IL_SISO_SWITCH_MIMO2_AC:
case IL_SISO_SWITCH_MIMO2_BC:
D_RATE("LQ: SISO switch to MIMO2\n");
memcpy(search_tbl, tbl, sz);
search_tbl->is_SGI = 0;
if (tbl->action == IL_SISO_SWITCH_MIMO2_AB)
search_tbl->ant_type = ANT_AB;
else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC)
search_tbl->ant_type = ANT_AC;
else
search_tbl->ant_type = ANT_BC;
if (!il4965_rs_is_valid_ant
(valid_tx_ant, search_tbl->ant_type))
break;
ret =
il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
search_tbl, idx);
if (!ret)
goto out;
break;
case IL_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;
D_RATE("LQ: SISO toggle SGI/NGI\n");
memcpy(search_tbl, tbl, sz);
if (is_green) {
if (!tbl->is_SGI)
break;
else
IL_ERR("SGI was set in GF+SISO\n");
}
search_tbl->is_SGI = !tbl->is_SGI;
il4965_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[idx])
break;
}
search_tbl->current_rate =
il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
is_green);
update_search_tbl_counter = 1;
goto out;
}
tbl->action++;
if (tbl->action > IL_SISO_SWITCH_GI)
tbl->action = IL_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 > IL_SISO_SWITCH_GI)
tbl->action = IL_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
il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct ieee80211_sta *sta, int idx)
{
s8 is_green = lq_sta->is_green;
struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
struct il_scale_tbl_info *search_tbl =
&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
struct il_rate_scale_data *win = &(tbl->win[idx]);
struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
u32 sz =
(sizeof(struct il_scale_tbl_info) -
(sizeof(struct il_rate_scale_data) * RATE_COUNT));
u8 start_action;
u8 valid_tx_ant = il->hw_params.valid_tx_ant;
u8 tx_chains_num = il->hw_params.tx_chains_num;
u8 update_search_tbl_counter = 0;
int ret;
start_action = tbl->action;
for (;;) {
lq_sta->action_counter++;
switch (tbl->action) {
case IL_MIMO2_SWITCH_ANTENNA1:
case IL_MIMO2_SWITCH_ANTENNA2:
D_RATE("LQ: MIMO2 toggle Antennas\n");
if (tx_chains_num <= 2)
break;
if (win->success_ratio >= IL_RS_GOOD_RATIO)
break;
memcpy(search_tbl, tbl, sz);
if (il4965_rs_toggle_antenna
(valid_tx_ant, &search_tbl->current_rate,
search_tbl)) {
update_search_tbl_counter = 1;
goto out;
}
break;
case IL_MIMO2_SWITCH_SISO_A:
case IL_MIMO2_SWITCH_SISO_B:
case IL_MIMO2_SWITCH_SISO_C:
D_RATE("LQ: MIMO2 switch to SISO\n");
/* Set up new search table for SISO */
memcpy(search_tbl, tbl, sz);
if (tbl->action == IL_MIMO2_SWITCH_SISO_A)
search_tbl->ant_type = ANT_A;
else if (tbl->action == IL_MIMO2_SWITCH_SISO_B)
search_tbl->ant_type = ANT_B;
else
search_tbl->ant_type = ANT_C;
if (!il4965_rs_is_valid_ant
(valid_tx_ant, search_tbl->ant_type))
break;
ret =
il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
search_tbl, idx);
if (!ret)
goto out;
break;
case IL_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;
D_RATE("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;
il4965_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[idx])
break;
}
search_tbl->current_rate =
il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
is_green);
update_search_tbl_counter = 1;
goto out;
}
tbl->action++;
if (tbl->action > IL_MIMO2_SWITCH_GI)
tbl->action = IL_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 > IL_MIMO2_SWITCH_GI)
tbl->action = IL_MIMO2_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
il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search)
{
struct il_scale_tbl_info *tbl;
int i;
int active_tbl;
int flush_interval_passed = 0;
struct il_priv *il;
il = 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 +
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)) {
D_RATE("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;
D_RATE("LQ: stay in table clear win\n");
for (i = 0; i < RATE_COUNT; i++)
il4965_rs_rate_scale_clear_win(&
(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 < RATE_COUNT; i++)
il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
}
}
}
/*
* setup rate table in uCode
*/
static void
il4965_rs_update_rate_tbl(struct il_priv *il, struct il_lq_sta *lq_sta,
struct il_scale_tbl_info *tbl, int idx, u8 is_green)
{
u32 rate;
/* Update uCode's rate table. */
rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
il4965_rs_fill_link_cmd(il, lq_sta, rate);
il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
}
/*
* Do rate scaling and search for new modulation mode.
*/
static void
il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb,
struct ieee80211_sta *sta,
struct il_lq_sta *lq_sta)
{
struct ieee80211_hw *hw = il->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 = RATE_INVALID;
int high = RATE_INVALID;
int idx;
int i;
struct il_rate_scale_data *win = NULL;
int current_tpt = IL_INVALID_VALUE;
int low_tpt = IL_INVALID_VALUE;
int high_tpt = IL_INVALID_VALUE;
u32 fail_count;
s8 scale_action = 0;
u16 rate_mask;
u8 update_lq = 0;
struct il_scale_tbl_info *tbl, *tbl1;
u16 rate_scale_idx_msk = 0;
u8 is_green = 0;
u8 active_tbl = 0;
u8 done_search = 0;
u16 high_low;
s32 sr;
u8 tid = MAX_TID_COUNT;
struct il_tid_data *tid_data;
D_RATE("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 = il4965_rs_tl_add_packet(lq_sta, hdr);
if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) {
tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid];
if (tid_data->agg.state == IL_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 = il4965_rs_use_green(il, sta);
is_green = lq_sta->is_green;
/* current tx rate */
idx = lq_sta->last_txrate_idx;
D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type);
/* rates available for this association, and for modulation mode */
rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
D_RATE("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_idx_msk =
(u16) (rate_mask &
(lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
else
rate_scale_idx_msk =
(u16) (rate_mask & lq_sta->supp_rates);
} else
rate_scale_idx_msk = rate_mask;
if (!rate_scale_idx_msk)
rate_scale_idx_msk = rate_mask;
if (!((1 << idx) & rate_scale_idx_msk)) {
IL_ERR("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 */
idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx,
is_green);
}
return;
}
/* Get expected throughput table and history win for current rate */
if (!tbl->expected_tpt) {
IL_ERR("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 < idx) {
idx = lq_sta->max_rate_idx;
update_lq = 1;
win = &(tbl->win[idx]);
goto lq_update;
}
win = &(tbl->win[idx]);
/*
* 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 = win->counter - win->success_counter;
if (fail_count < RATE_MIN_FAILURE_TH &&
win->success_counter < RATE_MIN_SUCCESS_TH) {
D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n",
win->success_counter, win->counter, idx);
/* Can't calculate this yet; not enough history */
win->average_tpt = IL_INVALID_VALUE;
/* Should we stay with this modulation mode,
* or search for a new one? */
il4965_rs_stay_in_table(lq_sta, false);
goto out;
}
/* Else we have enough samples; calculate estimate of
* actual average throughput */
if (win->average_tpt !=
((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) {
IL_ERR("expected_tpt should have been calculated by now\n");
win->average_tpt =
((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128);
}
/* If we are searching for better modulation mode, check success. */
if (lq_sta->search_better_tbl) {
/* If good success, continue using the "search" mode;
* no need to send new link quality command, since we're
* continuing to use the setup that we've been trying. */
if (win->average_tpt > lq_sta->last_tpt) {
D_RATE("LQ: SWITCHING TO NEW TBL "
"suc=%d cur-tpt=%d old-tpt=%d\n",
win->success_ratio, win->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 = win->average_tpt;
/* Else poor success; go back to mode in "active" table */
} else {
D_RATE("LQ: GOING BACK TO THE OLD TBL "
"suc=%d cur-tpt=%d old-tpt=%d\n",
win->success_ratio, win->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 */
idx = il4965_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 =
il4965_rs_get_adjacent_rate(il, idx, rate_scale_idx_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 = RATE_INVALID;
sr = win->success_ratio;
/* Collect measured throughputs for current and adjacent rates */
current_tpt = win->average_tpt;
if (low != RATE_INVALID)
low_tpt = tbl->win[low].average_tpt;
if (high != RATE_INVALID)
high_tpt = tbl->win[high].average_tpt;
scale_action = 0;
/* Too many failures, decrease rate */
if (sr <= RATE_DECREASE_TH || current_tpt == 0) {
D_RATE("decrease rate because of low success_ratio\n");
scale_action = -1;
/* No throughput measured yet for adjacent rates; try increase. */
} else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
if (high != RATE_INVALID && sr >= RATE_INCREASE_TH)
scale_action = 1;
else if (low != 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 != IL_INVALID_VALUE && high_tpt != IL_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 != IL_INVALID_VALUE) {
/* Higher rate has better throughput */
if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH)
scale_action = 1;
else
scale_action = 0;
/* Lower adjacent rate's throughput is measured */
} else if (low_tpt != IL_INVALID_VALUE) {
/* Lower rate has better throughput */
if (low_tpt > current_tpt) {
D_RATE("decrease rate because of low tpt\n");
scale_action = -1;
} else if (sr >= 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 != RATE_INVALID &&
(sr > RATE_HIGH_TH || current_tpt > 100 * tbl->expected_tpt[low]))
scale_action = 0;
switch (scale_action) {
case -1:
/* Decrease starting rate, update uCode's rate table */
if (low != RATE_INVALID) {
update_lq = 1;
idx = low;
}
break;
case 1:
/* Increase starting rate, update uCode's rate table */
if (high != RATE_INVALID) {
update_lq = 1;
idx = high;
}
break;
case 0:
/* No change */
default:
break;
}
D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n",
idx, scale_action, low, high, tbl->lq_type);
lq_update:
/* Replace uCode's rate table for the destination station. */
if (update_lq)
il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green);
/* Should we stay with this modulation mode,
* or search for a new one? */
il4965_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 && win->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))
il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx);
else if (is_siso(tbl->lq_type))
il4965_rs_move_siso_to_other(il, lq_sta, conf, sta,
idx);
else /* (is_mimo2(tbl->lq_type)) */
il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta,
idx);
/* 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 < RATE_COUNT; i++)
il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
/* Use new "search" start rate */
idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
D_RATE("Switch current mcs: %X idx: %d\n",
tbl->current_rate, idx);
il4965_rs_fill_link_cmd(il, lq_sta, tbl->current_rate);
il_send_lq_cmd(il, &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) {
D_RATE("LQ: STAY in legacy table\n");
il4965_rs_set_stay_in_table(il, 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) {
if (lq_sta->last_tpt > IL_AGG_TPT_THREHOLD &&
(lq_sta->tx_agg_tid_en & (1 << tid)) &&
tid != MAX_TID_COUNT) {
tid_data =
&il->stations[lq_sta->lq.sta_id].tid[tid];
if (tid_data->agg.state == IL_AGG_OFF) {
D_RATE("try to aggregate tid %d\n",
tid);
il4965_rs_tl_turn_on_agg(il, tid,
lq_sta, sta);
}
}
il4965_rs_set_stay_in_table(il, 0, lq_sta);
}
}
out:
tbl->current_rate =
il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
i = idx;
lq_sta->last_txrate_idx = i;
}
/**
* il4965_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-4965-rs rate scaling algorithm is used, instead of
* rc80211_simple.
*
* NOTE: Run C_ADD_STA command to set up station table entry, before
* calling this function (which runs C_TX_LINK_QUALITY_CMD,
* which requires station table entry to exist).
*/
static void
il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf,
struct ieee80211_sta *sta, struct il_lq_sta *lq_sta)
{
struct il_scale_tbl_info *tbl;
int rate_idx;
int i;
u32 rate;
u8 use_green;
u8 active_tbl = 0;
u8 valid_tx_ant;
struct il_station_priv *sta_priv;
if (!sta || !lq_sta)
return;
use_green = il4965_rs_use_green(il, sta);
sta_priv = (void *)sta->drv_priv;
i = lq_sta->last_txrate_idx;
valid_tx_ant = il->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 >= RATE_COUNT)
i = 0;
rate = il_rates[i].plcp;
tbl->ant_type = il4965_first_antenna(valid_tx_ant);
rate |= tbl->ant_type << RATE_MCS_ANT_POS;
if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE)
rate |= RATE_MCS_CCK_MSK;
il4965_rs_get_tbl_info_from_mcs(rate, il->band, tbl, &rate_idx);
if (!il4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
il4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
rate = il4965_rate_n_flags_from_tbl(il, tbl, rate_idx, use_green);
tbl->current_rate = rate;
il4965_rs_set_expected_tpt_table(lq_sta, tbl);
il4965_rs_fill_link_cmd(NULL, lq_sta, rate);
il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
il_send_lq_cmd(il, &lq_sta->lq, CMD_SYNC, true);
}
static void
il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
struct ieee80211_tx_rate_control *txrc)
{
struct sk_buff *skb = txrc->skb;
struct ieee80211_supported_band *sband = txrc->sband;
struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct il_lq_sta *lq_sta = il_sta;
int rate_idx;
D_RATE("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 += IL_FIRST_OFDM_RATE;
if (lq_sta->max_rate_idx < 0 ||
lq_sta->max_rate_idx >= RATE_COUNT)
lq_sta->max_rate_idx = -1;
}
/* Treat uninitialized rate scaling data same as non-existing. */
if (lq_sta && !lq_sta->drv) {
D_RATE("Rate scaling not initialized yet.\n");
il_sta = NULL;
}
/* Send management frames and NO_ACK data using lowest rate. */
if (rate_control_send_low(sta, il_sta, txrc))
return;
if (!lq_sta)
return;
rate_idx = lq_sta->last_txrate_idx;
if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
rate_idx -= IL_FIRST_OFDM_RATE;
/* 6M and 9M shared same MCS idx */
rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
if (il4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
RATE_MIMO2_6M_PLCP)
rate_idx = rate_idx + MCS_IDX_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 >= RATE_COUNT_LEGACY ||
(sband->band == IEEE80211_BAND_5GHZ &&
rate_idx < IL_FIRST_OFDM_RATE))
rate_idx = rate_lowest_index(sband, sta);
/* On valid 5 GHz rate, adjust idx */
else if (sband->band == IEEE80211_BAND_5GHZ)
rate_idx -= IL_FIRST_OFDM_RATE;
info->control.rates[0].flags = 0;
}
info->control.rates[0].idx = rate_idx;
info->control.rates[0].count = 1;
}
static void *
il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp)
{
struct il_station_priv *sta_priv =
(struct il_station_priv *)sta->drv_priv;
struct il_priv *il;
il = (struct il_priv *)il_rate;
D_RATE("create station rate scale win\n");
return &sta_priv->lq_sta;
}
/*
* Called after adding a new station to initialize rate scaling
*/
void
il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
{
int i, j;
struct ieee80211_hw *hw = il->hw;
struct ieee80211_conf *conf = &il->hw->conf;
struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
struct il_station_priv *sta_priv;
struct il_lq_sta *lq_sta;
struct ieee80211_supported_band *sband;
sta_priv = (struct il_station_priv *)sta->drv_priv;
lq_sta = &sta_priv->lq_sta;
sband = hw->wiphy->bands[conf->chandef.chan->band];
lq_sta->lq.sta_id = sta_id;
for (j = 0; j < LQ_SIZE; j++)
for (i = 0; i < RATE_COUNT; i++)
il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
win[i]);
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 < RATE_COUNT; i++)
il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
win[i]);
D_RATE("LQ:" "*** rate scale station global init for station %d ***\n",
sta_id);
/* TODO: what is a good starting rate for STA? About middle? Maybe not
* the lowest or the highest rate.. Could consider using RSSI from
* previous packets? Need to have IEEE 802.1X auth succeed immediately
* after assoc.. */
lq_sta->is_dup = 0;
lq_sta->max_rate_idx = -1;
lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX;
lq_sta->is_green = il4965_rs_use_green(il, sta);
lq_sta->active_legacy_rate = il->active_rate & ~(0x1000);
lq_sta->band = il->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 <<= IL_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 <<= IL_FIRST_OFDM_RATE;
/* These values will be overridden later */
lq_sta->lq.general_params.single_stream_ant_msk =
il4965_first_antenna(il->hw_params.valid_tx_ant);
lq_sta->lq.general_params.dual_stream_ant_msk =
il->hw_params.valid_tx_ant & ~il4965_first_antenna(il->hw_params.
valid_tx_ant);
if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
} else if (il4965_num_of_ant(il->hw_params.valid_tx_ant) == 2) {
lq_sta->lq.general_params.dual_stream_ant_msk =
il->hw_params.valid_tx_ant;
}
/* as default allow aggregation for all tids */
lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID;
lq_sta->drv = il;
/* 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 += IL_FIRST_OFDM_RATE;
lq_sta->is_agg = 0;
#ifdef CPTCFG_MAC80211_DEBUGFS
lq_sta->dbg_fixed_rate = 0;
#endif
il4965_rs_initialize_lq(il, conf, sta, lq_sta);
}
static void
il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
u32 new_rate)
{
struct il_scale_tbl_info tbl_type;
int idx = 0;
int rate_idx;
int repeat_rate = 0;
u8 ant_toggle_cnt = 0;
u8 use_ht_possible = 1;
u8 valid_tx_ant = 0;
struct il_link_quality_cmd *lq_cmd = &lq_sta->lq;
/* Override starting rate (idx 0) if needed for debug purposes */
il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
/* Interpret new_rate (rate_n_flags) */
il4965_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 = IL_NUMBER_TRY;
} else {
repeat_rate = IL_HT_NUMBER_TRY;
}
lq_cmd->general_params.mimo_delimiter =
is_mimo(tbl_type.lq_type) ? 1 : 0;
/* Fill 1st table entry (idx 0) */
lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
if (il4965_num_of_ant(tbl_type.ant_type) == 1) {
lq_cmd->general_params.single_stream_ant_msk =
tbl_type.ant_type;
} else if (il4965_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 */
idx++;
repeat_rate--;
if (il)
valid_tx_ant = il->hw_params.valid_tx_ant;
/* Fill rest of rate table */
while (idx < LINK_QUAL_MAX_RETRY_NUM) {
/* Repeat initial/next rate.
* For legacy IL_NUMBER_TRY == 1, this loop will not execute.
* For HT IL_HT_NUMBER_TRY == 3, this executes twice. */
while (repeat_rate > 0 && idx < 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 (il &&
il4965_rs_toggle_antenna(valid_tx_ant,
&new_rate,
&tbl_type))
ant_toggle_cnt = 1;
}
/* Override next rate if needed for debug purposes */
il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
/* Fill next table entry */
lq_cmd->rs_table[idx].rate_n_flags =
cpu_to_le32(new_rate);
repeat_rate--;
idx++;
}
il4965_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 (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
if (is_mimo(tbl_type.lq_type))
lq_cmd->general_params.mimo_delimiter = idx;
/* Get next rate */
new_rate =
il4965_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 (il &&
il4965_rs_toggle_antenna(valid_tx_ant,
&new_rate, &tbl_type))
ant_toggle_cnt = 1;
repeat_rate = IL_NUMBER_TRY;
} else {
repeat_rate = IL_HT_NUMBER_TRY;
}
/* Don't allow HT rates after next pass.
* il4965_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 */
il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
/* Fill next table entry */
lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
idx++;
repeat_rate--;
}
lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
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 *
il4965_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
{
return hw->priv;
}
/* rate scale requires free function to be implemented */
static void
il4965_rs_free(void *il_rate)
{
return;
}
static void
il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta)
{
struct il_priv *il __maybe_unused = il_r;
D_RATE("enter\n");
D_RATE("leave\n");
}
#ifdef CPTCFG_MAC80211_DEBUGFS
static void
il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
{
struct il_priv *il;
u8 valid_tx_ant;
u8 ant_sel_tx;
il = lq_sta->drv;
valid_tx_ant = il->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;
D_RATE("Fixed rate ON\n");
} else {
lq_sta->dbg_fixed_rate = 0;
IL_ERR
("Invalid antenna selection 0x%X, Valid is 0x%X\n",
ant_sel_tx, valid_tx_ant);
D_RATE("Fixed rate OFF\n");
}
} else {
D_RATE("Fixed rate OFF\n");
}
}
static ssize_t
il4965_rs_sta_dbgfs_scale_table_write(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct il_lq_sta *lq_sta = file->private_data;
struct il_priv *il;
char buf[64];
size_t buf_size;
u32 parsed_rate;
il = 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 */
D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id,
lq_sta->dbg_fixed_rate);
if (lq_sta->dbg_fixed_rate) {
il4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
il_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
}
return count;
}
static ssize_t
il4965_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 idx = 0;
ssize_t ret;
struct il_lq_sta *lq_sta = file->private_data;
struct il_priv *il;
struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
il = 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",
(il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
(il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
(il->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" : "MIMO2");
desc +=
sprintf(buff + desc, " %s",
(tbl->is_ht40) ? "40MHz" : "20MHz");
desc +=
sprintf(buff + desc, " %s %s %s\n",
(tbl->is_SGI) ? "SGI" : "",
(lq_sta->is_green) ? "GF enabled" : "",
(lq_sta->is_agg) ? "AGG on" : "");
}
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_idx[0],
lq_sta->lq.general_params.start_rate_idx[1],
lq_sta->lq.general_params.start_rate_idx[2],
lq_sta->lq.general_params.start_rate_idx[3]);
for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
idx =
il4965_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),
il_rate_mcs[idx].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),
il_rate_mcs[idx].mbps,
il_rate_mcs[idx].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 = il4965_rs_sta_dbgfs_scale_table_write,
.read = il4965_rs_sta_dbgfs_scale_table_read,
.open = simple_open,
.llseek = default_llseek,
};
static ssize_t
il4965_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 il_lq_sta *