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alistair23-linux/drivers/net/wireless/iwlegacy/4965-rs.c
Johannes Berg cc01f9b55f mac80211: remove module handling from rate control ops 
There's not a single rate control algorithm actually in
a separate module where the module refcount would be
required. Similarly, there's no specific rate control
module.

Therefore, all the module handling code in rate control
is really just dead code, so remove it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-02-04 21:48:26 +01:00

2836 lines
80 KiB
C
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/******************************************************************************
*
* 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 CONFIG_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 CONFIG_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 CONFIG_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 *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 < 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 = il4965_rs_sta_dbgfs_stats_table_read,
.open = simple_open,
.llseek = default_llseek,
};
static ssize_t
il4965_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;
struct il_lq_sta *lq_sta = file->private_data;
struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
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",
il_rates[lq_sta->last_txrate_idx].ieee >> 1);
return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
}
static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
.read = il4965_rs_sta_dbgfs_rate_scale_data_read,
.open = simple_open,
.llseek = default_llseek,
};
static void
il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)
{
struct il_lq_sta *lq_sta = il_sta;
lq_sta->rs_sta_dbgfs_scale_table_file =
debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
lq_sta, &rs_sta_dbgfs_scale_table_ops);
lq_sta->rs_sta_dbgfs_stats_table_file =
debugfs_create_file("rate_stats_table", S_IRUSR, dir, lq_sta,
&rs_sta_dbgfs_stats_table_ops);
lq_sta->rs_sta_dbgfs_rate_scale_data_file =
debugfs_create_file("rate_scale_data", S_IRUSR, 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", S_IRUSR | S_IWUSR, dir,
&lq_sta->tx_agg_tid_en);
}
static void
il4965_rs_remove_debugfs(void *il, void *il_sta)
{
struct il_lq_sta *lq_sta = il_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
/*
* Initialization of rate scaling information is done by driver after
* the station is added. Since mac80211 calls this function before a
* station is added we ignore it.
*/
static void
il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
struct cfg80211_chan_def *chandef,
struct ieee80211_sta *sta, void *il_sta)
{
}
static const struct rate_control_ops rs_4965_ops = {
.name = IL4965_RS_NAME,
.tx_status = il4965_rs_tx_status,
.get_rate = il4965_rs_get_rate,
.rate_init = il4965_rs_rate_init_stub,
.alloc = il4965_rs_alloc,
.free = il4965_rs_free,
.alloc_sta = il4965_rs_alloc_sta,
.free_sta = il4965_rs_free_sta,
#ifdef CONFIG_MAC80211_DEBUGFS
.add_sta_debugfs = il4965_rs_add_debugfs,
.remove_sta_debugfs = il4965_rs_remove_debugfs,
#endif
};
int
il4965_rate_control_register(void)
{
return ieee80211_rate_control_register(&rs_4965_ops);
}
void
il4965_rate_control_unregister(void)
{
ieee80211_rate_control_unregister(&rs_4965_ops);
}
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