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linux_old1/drivers/net/wireless/iwlwifi/iwl-4965-rs.c

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/******************************************************************************
*
* Copyright(c) 2005 - 2007 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:
* James P. Ketrenos <ipw2100-admin@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
*****************************************************************************/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/wireless.h>
#include <net/mac80211.h>
#include <net/ieee80211.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <net/mac80211.h>
#include <linux/wireless.h>
#include "../net/mac80211/ieee80211_rate.h"
#include "iwlwifi.h"
#include "iwl-helpers.h"
#define RS_NAME "iwl-4965-rs"
#define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
#define IWL_NUMBER_TRY 1
#define IWL_HT_NUMBER_TRY 3
#define IWL_RATE_MAX_WINDOW 62
#define IWL_RATE_HIGH_TH 10880
#define IWL_RATE_MIN_FAILURE_TH 6
#define IWL_RATE_MIN_SUCCESS_TH 8
#define IWL_RATE_DECREASE_TH 1920
#define IWL_RATE_INCREASE_TH 8960
#define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ) /*2 seconds */
static u8 rs_ht_to_legacy[] = {
IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
IWL_RATE_6M_INDEX,
IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
};
struct iwl_rate {
u32 rate_n_flags;
} __attribute__ ((packed));
struct iwl_rate_scale_data {
u64 data;
s32 success_counter;
s32 success_ratio;
s32 counter;
s32 average_tpt;
unsigned long stamp;
};
struct iwl_scale_tbl_info {
enum iwl_table_type lq_type;
enum iwl_antenna_type antenna_type;
u8 is_SGI;
u8 is_fat;
u8 is_dup;
u8 action;
s32 *expected_tpt;
struct iwl_rate current_rate;
struct iwl_rate_scale_data win[IWL_RATE_COUNT];
};
struct iwl_rate_scale_priv {
u8 active_tbl;
u8 enable_counter;
u8 stay_in_tbl;
u8 search_better_tbl;
s32 last_tpt;
u32 table_count_limit;
u32 max_failure_limit;
u32 max_success_limit;
u32 table_count;
u32 total_failed;
u32 total_success;
u32 flush_timer;
u8 action_counter;
u8 antenna;
u8 valid_antenna;
u8 is_green;
u8 is_dup;
u8 phymode;
u8 ibss_sta_added;
u16 active_rate;
u16 active_siso_rate;
u16 active_mimo_rate;
u16 active_rate_basic;
struct iwl_link_quality_cmd lq;
struct iwl_scale_tbl_info lq_info[LQ_SIZE];
};
static void rs_rate_scale_perform(struct iwl_priv *priv,
struct net_device *dev,
struct ieee80211_hdr *hdr,
struct sta_info *sta);
static int rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
struct iwl_rate *tx_mcs,
struct iwl_link_quality_cmd *tbl,
struct sta_info *sta);
static s32 expected_tpt_A[IWL_RATE_COUNT] = {
0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
};
static s32 expected_tpt_G[IWL_RATE_COUNT] = {
7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
};
static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
};
static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
};
static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
};
static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
};
static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
};
static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
};
static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
};
static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
};
static int iwl_lq_sync_callback(struct iwl_priv *priv,
struct iwl_cmd *cmd, struct sk_buff *skb)
{
/*We didn't cache the SKB; let the caller free it */
return 1;
}
static inline u8 iwl_rate_get_rate(u32 rate_n_flags)
{
return (u8)(rate_n_flags & 0xFF);
}
static int rs_send_lq_cmd(struct iwl_priv *priv,
struct iwl_link_quality_cmd *lq, u8 flags)
{
#ifdef CONFIG_IWLWIFI_DEBUG
int i;
#endif
int rc = -1;
struct iwl_host_cmd cmd = {
.id = REPLY_TX_LINK_QUALITY_CMD,
.len = sizeof(struct iwl_link_quality_cmd),
.meta.flags = flags,
.data = lq,
};
if ((lq->sta_id == 0xFF) &&
(priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
return rc;
if (lq->sta_id == 0xFF)
lq->sta_id = IWL_AP_ID;
IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
lq->general_params.single_stream_ant_msk,
lq->general_params.dual_stream_ant_msk);
#ifdef CONFIG_IWLWIFI_DEBUG
for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
IWL_DEBUG_RATE("lq index %d 0x%X\n",
i, lq->rs_table[i].rate_n_flags);
#endif
if (flags & CMD_ASYNC)
cmd.meta.u.callback = iwl_lq_sync_callback;
if (iwl_is_associated(priv) && priv->assoc_station_added &&
priv->lq_mngr.lq_ready)
rc = iwl_send_cmd(priv, &cmd);
return rc;
}
static int rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
{
window->data = 0;
window->success_counter = 0;
window->success_ratio = IWL_INVALID_VALUE;
window->counter = 0;
window->average_tpt = IWL_INVALID_VALUE;
window->stamp = 0;
return 0;
}
static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
int scale_index, s32 tpt, u32 status)
{
int rc = 0;
struct iwl_rate_scale_data *window = NULL;
u64 mask;
u8 win_size = IWL_RATE_MAX_WINDOW;
s32 fail_count;
if (scale_index < 0)
return -1;
if (scale_index >= IWL_RATE_COUNT)
return -1;
window = &(windows[scale_index]);
if (window->counter >= win_size) {
window->counter = win_size - 1;
mask = 1;
mask = (mask << (win_size - 1));
if ((window->data & mask)) {
window->data &= ~mask;
window->success_counter = window->success_counter - 1;
}
}
window->counter = window->counter + 1;
mask = window->data;
window->data = (mask << 1);
if (status != 0) {
window->success_counter = window->success_counter + 1;
window->data |= 0x1;
}
if (window->counter > 0)
window->success_ratio = 128 * (100 * window->success_counter)
/ window->counter;
else
window->success_ratio = IWL_INVALID_VALUE;
fail_count = window->counter - window->success_counter;
if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
(window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
window->average_tpt = (window->success_ratio * tpt + 64) / 128;
else
window->average_tpt = IWL_INVALID_VALUE;
window->stamp = jiffies;
return rc;
}
int static rs_mcs_from_tbl(struct iwl_rate *mcs_rate,
struct iwl_scale_tbl_info *tbl,
int index, u8 use_green)
{
int rc = 0;
if (is_legacy(tbl->lq_type)) {
mcs_rate->rate_n_flags = iwl_rates[index].plcp;
if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
} else if (is_siso(tbl->lq_type)) {
if (index > IWL_LAST_OFDM_RATE)
index = IWL_LAST_OFDM_RATE;
mcs_rate->rate_n_flags = iwl_rates[index].plcp_siso |
RATE_MCS_HT_MSK;
} else {
if (index > IWL_LAST_OFDM_RATE)
index = IWL_LAST_OFDM_RATE;
mcs_rate->rate_n_flags = iwl_rates[index].plcp_mimo |
RATE_MCS_HT_MSK;
}
switch (tbl->antenna_type) {
case ANT_BOTH:
mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
break;
case ANT_MAIN:
mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
break;
case ANT_AUX:
mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
break;
case ANT_NONE:
break;
}
if (is_legacy(tbl->lq_type))
return rc;
if (tbl->is_fat) {
if (tbl->is_dup)
mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
else
mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
}
if (tbl->is_SGI)
mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
if (use_green) {
mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
if (is_siso(tbl->lq_type))
mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
}
return rc;
}
static int rs_get_tbl_info_from_mcs(const struct iwl_rate *mcs_rate,
int phymode, struct iwl_scale_tbl_info *tbl,
int *rate_idx)
{
int index;
u32 ant_msk;
index = iwl_rate_index_from_plcp(mcs_rate->rate_n_flags);
if (index == IWL_RATE_INVALID) {
*rate_idx = -1;
return -1;
}
tbl->is_SGI = 0;
tbl->is_fat = 0;
tbl->is_dup = 0;
tbl->antenna_type = ANT_BOTH;
if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
if (ant_msk == RATE_MCS_ANT_AB_MSK)
tbl->lq_type = LQ_NONE;
else {
if (phymode == MODE_IEEE80211A)
tbl->lq_type = LQ_A;
else
tbl->lq_type = LQ_G;
if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
tbl->antenna_type = ANT_MAIN;
else
tbl->antenna_type = ANT_AUX;
}
*rate_idx = index;
} else if (iwl_rate_get_rate(mcs_rate->rate_n_flags)
<= IWL_RATE_SISO_60M_PLCP) {
tbl->lq_type = LQ_SISO;
ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
if (ant_msk == RATE_MCS_ANT_AB_MSK)
tbl->lq_type = LQ_NONE;
else {
if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
tbl->antenna_type = ANT_MAIN;
else
tbl->antenna_type = ANT_AUX;
}
if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
tbl->is_SGI = 1;
if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
(mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
tbl->is_fat = 1;
if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
tbl->is_dup = 1;
*rate_idx = index;
} else {
tbl->lq_type = LQ_MIMO;
if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
tbl->is_SGI = 1;
if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
(mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
tbl->is_fat = 1;
if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
tbl->is_dup = 1;
*rate_idx = index;
}
return 0;
}
static inline void rs_toggle_antenna(struct iwl_rate *new_rate,
struct iwl_scale_tbl_info *tbl)
{
if (tbl->antenna_type == ANT_AUX) {
tbl->antenna_type = ANT_MAIN;
new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
} else {
tbl->antenna_type = ANT_AUX;
new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
}
}
static inline s8 rs_use_green(struct iwl_priv *priv)
{
s8 rc = 0;
#ifdef CONFIG_IWLWIFI_HT
if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
return 0;
if ((priv->current_assoc_ht.is_green_field) &&
!(priv->current_assoc_ht.operating_mode & 0x4))
rc = 1;
#endif /*CONFIG_IWLWIFI_HT */
return rc;
}
/**
* rs_get_supported_rates - get the available rates
*
* if management frame or broadcast frame only return
* basic available rates.
*
*/
static void rs_get_supported_rates(struct iwl_rate_scale_priv *lq_data,
struct ieee80211_hdr *hdr,
enum iwl_table_type rate_type,
u16 *data_rate)
{
if (is_legacy(rate_type))
*data_rate = lq_data->active_rate;
else {
if (is_siso(rate_type))
*data_rate = lq_data->active_siso_rate;
else
*data_rate = lq_data->active_mimo_rate;
}
if (hdr && is_multicast_ether_addr(hdr->addr1) &&
lq_data->active_rate_basic)
*data_rate = lq_data->active_rate_basic;
}
static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
{
u8 high = IWL_RATE_INVALID;
u8 low = IWL_RATE_INVALID;
/* 802.11A or ht walks to the next literal adjascent rate in
* the rate table */
if (is_a_band(rate_type) || !is_legacy(rate_type)) {
int i;
u32 mask;
/* Find the previous rate that is in the rate mask */
i = index - 1;
for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
if (rate_mask & mask) {
low = i;
break;
}
}
/* Find the next rate that is in the rate mask */
i = index + 1;
for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
if (rate_mask & mask) {
high = i;
break;
}
}
return (high << 8) | low;
}
low = index;
while (low != IWL_RATE_INVALID) {
low = iwl_rates[low].prev_rs;
if (low == IWL_RATE_INVALID)
break;
if (rate_mask & (1 << low))
break;
IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
}
high = index;
while (high != IWL_RATE_INVALID) {
high = iwl_rates[high].next_rs;
if (high == IWL_RATE_INVALID)
break;
if (rate_mask & (1 << high))
break;
IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
}
return (high << 8) | low;
}
static int rs_get_lower_rate(struct iwl_rate_scale_priv *lq_data,
struct iwl_scale_tbl_info *tbl, u8 scale_index,
u8 ht_possible, struct iwl_rate *mcs_rate,
struct sta_info *sta)
{
u8 is_green = lq_data->is_green;
s32 low;
u16 rate_mask;
u16 high_low;
u8 switch_to_legacy = 0;
/* check if we need to switch from HT to legacy rates.
* assumption is that mandatory rates (1Mbps or 6Mbps)
* are always supported (spec demand) */
if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
switch_to_legacy = 1;
scale_index = rs_ht_to_legacy[scale_index];
if (lq_data->phymode == MODE_IEEE80211A)
tbl->lq_type = LQ_A;
else
tbl->lq_type = LQ_G;
if ((tbl->antenna_type == ANT_BOTH) ||
(tbl->antenna_type == ANT_NONE))
tbl->antenna_type = ANT_MAIN;
tbl->is_fat = 0;
tbl->is_SGI = 0;
}
rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask);
/* mask with station rate restriction */
if (is_legacy(tbl->lq_type)) {
if (lq_data->phymode == (u8) MODE_IEEE80211A)
rate_mask = (u16)(rate_mask &
(sta->supp_rates << IWL_FIRST_OFDM_RATE));
else
rate_mask = (u16)(rate_mask & sta->supp_rates);
}
/* if we did switched from HT to legacy check current rate */
if ((switch_to_legacy) &&
(rate_mask & (1 << scale_index))) {
rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
return 0;
}
high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
low = high_low & 0xff;
if (low != IWL_RATE_INVALID)
rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
else
rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
return 0;
}
static void rs_tx_status(void *priv_rate,
struct net_device *dev,
struct sk_buff *skb,
struct ieee80211_tx_status *tx_resp)
{
int status;
u8 retries;
int rs_index, index = 0;
struct iwl_rate_scale_priv *lq;
struct iwl_link_quality_cmd *table;
struct sta_info *sta;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct iwl_rate_scale_data *window = NULL;
struct iwl_rate_scale_data *search_win = NULL;
struct iwl_rate tx_mcs;
struct iwl_scale_tbl_info tbl_type;
struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
u8 active_index = 0;
u16 fc = le16_to_cpu(hdr->frame_control);
s32 tpt = 0;
IWL_DEBUG_RATE("get frame ack response, update rate scale window\n");
if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
return;
retries = tx_resp->retry_count;
if (retries > 15)
retries = 15;
sta = sta_info_get(local, hdr->addr1);
if (!sta || !sta->rate_ctrl_priv) {
if (sta)
sta_info_put(sta);
return;
}
lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
if (!priv->lq_mngr.lq_ready)
return;
if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added)
return;
table = &lq->lq;
active_index = lq->active_tbl;
lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx);
if (!lq->antenna)
lq->antenna = lq->valid_antenna;
lq->antenna = lq->valid_antenna;
curr_tbl = &(lq->lq_info[active_index]);
search_tbl = &(lq->lq_info[(1 - active_index)]);
window = (struct iwl_rate_scale_data *)
&(curr_tbl->win[0]);
search_win = (struct iwl_rate_scale_data *)
&(search_tbl->win[0]);
tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
&tbl_type, &rs_index);
if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) {
IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
rs_index, tx_mcs.rate_n_flags);
sta_info_put(sta);
return;
}
if (retries &&
(tx_mcs.rate_n_flags !=
le32_to_cpu(table->rs_table[0].rate_n_flags))) {
IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
tx_mcs.rate_n_flags,
le32_to_cpu(table->rs_table[0].rate_n_flags));
sta_info_put(sta);
return;
}
while (retries) {
tx_mcs.rate_n_flags =
le32_to_cpu(table->rs_table[index].rate_n_flags);
rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
&tbl_type, &rs_index);
if ((tbl_type.lq_type == search_tbl->lq_type) &&
(tbl_type.antenna_type == search_tbl->antenna_type) &&
(tbl_type.is_SGI == search_tbl->is_SGI)) {
if (search_tbl->expected_tpt)
tpt = search_tbl->expected_tpt[rs_index];
else
tpt = 0;
rs_collect_tx_data(search_win,
rs_index, tpt, 0);
} else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
(tbl_type.antenna_type == curr_tbl->antenna_type) &&
(tbl_type.is_SGI == curr_tbl->is_SGI)) {
if (curr_tbl->expected_tpt)
tpt = curr_tbl->expected_tpt[rs_index];
else
tpt = 0;
rs_collect_tx_data(window, rs_index, tpt, 0);
}
if (lq->stay_in_tbl)
lq->total_failed++;
--retries;
index++;
}
if (!tx_resp->retry_count)
tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
else
tx_mcs.rate_n_flags =
le32_to_cpu(table->rs_table[index].rate_n_flags);
rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
&tbl_type, &rs_index);
if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
status = 1;
else
status = 0;
if ((tbl_type.lq_type == search_tbl->lq_type) &&
(tbl_type.antenna_type == search_tbl->antenna_type) &&
(tbl_type.is_SGI == search_tbl->is_SGI)) {
if (search_tbl->expected_tpt)
tpt = search_tbl->expected_tpt[rs_index];
else
tpt = 0;
rs_collect_tx_data(search_win,
rs_index, tpt, status);
} else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
(tbl_type.antenna_type == curr_tbl->antenna_type) &&
(tbl_type.is_SGI == curr_tbl->is_SGI)) {
if (curr_tbl->expected_tpt)
tpt = curr_tbl->expected_tpt[rs_index];
else
tpt = 0;
rs_collect_tx_data(window, rs_index, tpt, status);
}
if (lq->stay_in_tbl) {
if (status)
lq->total_success++;
else
lq->total_failed++;
}
rs_rate_scale_perform(priv, dev, hdr, sta);
sta_info_put(sta);
return;
}
static u8 rs_is_ant_connected(u8 valid_antenna,
enum iwl_antenna_type antenna_type)
{
if (antenna_type == ANT_AUX)
return ((valid_antenna & 0x2) ? 1:0);
else if (antenna_type == ANT_MAIN)
return ((valid_antenna & 0x1) ? 1:0);
else if (antenna_type == ANT_BOTH) {
if ((valid_antenna & 0x3) == 0x3)
return 1;
else
return 0;
}
return 1;
}
static u8 rs_is_other_ant_connected(u8 valid_antenna,
enum iwl_antenna_type antenna_type)
{
if (antenna_type == ANT_AUX)
return (rs_is_ant_connected(valid_antenna, ANT_MAIN));
else
return (rs_is_ant_connected(valid_antenna, ANT_AUX));
return 0;
}
static void rs_set_stay_in_table(u8 is_legacy,
struct iwl_rate_scale_priv *lq_data)
{
IWL_DEBUG_HT("we are staying in the same table\n");
lq_data->stay_in_tbl = 1;
if (is_legacy) {
lq_data->table_count_limit = IWL_LEGACY_TABLE_COUNT;
lq_data->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
lq_data->max_success_limit = IWL_LEGACY_TABLE_COUNT;
} else {
lq_data->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
lq_data->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
lq_data->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
}
lq_data->table_count = 0;
lq_data->total_failed = 0;
lq_data->total_success = 0;
}
static void rs_get_expected_tpt_table(struct iwl_rate_scale_priv *lq_data,
struct iwl_scale_tbl_info *tbl)
{
if (is_legacy(tbl->lq_type)) {
if (!is_a_band(tbl->lq_type))
tbl->expected_tpt = expected_tpt_G;
else
tbl->expected_tpt = expected_tpt_A;
} else if (is_siso(tbl->lq_type)) {
if (tbl->is_fat && !lq_data->is_dup)
if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_siso40MHzSGI;
else
tbl->expected_tpt = expected_tpt_siso40MHz;
else if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_siso20MHzSGI;
else
tbl->expected_tpt = expected_tpt_siso20MHz;
} else if (is_mimo(tbl->lq_type)) {
if (tbl->is_fat && !lq_data->is_dup)
if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
else
tbl->expected_tpt = expected_tpt_mimo40MHz;
else if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
else
tbl->expected_tpt = expected_tpt_mimo20MHz;
} else
tbl->expected_tpt = expected_tpt_G;
}
#ifdef CONFIG_IWLWIFI_HT
static s32 rs_get_best_rate(struct iwl_priv *priv,
struct iwl_rate_scale_priv *lq_data,
struct iwl_scale_tbl_info *tbl,
u16 rate_mask, s8 index, s8 rate)
{
struct iwl_scale_tbl_info *active_tbl =
&(lq_data->lq_info[lq_data->active_tbl]);
s32 new_rate, high, low, start_hi;
s32 active_sr = active_tbl->win[index].success_ratio;
s32 *tpt_tbl = tbl->expected_tpt;
s32 active_tpt = active_tbl->expected_tpt[index];
u16 high_low;
new_rate = high = low = start_hi = IWL_RATE_INVALID;
for (; ;) {
high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
low = high_low & 0xff;
high = (high_low >> 8) & 0xff;
if ((((100 * tpt_tbl[rate]) > lq_data->last_tpt) &&
((active_sr > IWL_RATE_DECREASE_TH) &&
(active_sr <= IWL_RATE_HIGH_TH) &&
(tpt_tbl[rate] <= active_tpt))) ||
((active_sr >= IWL_RATE_SCALE_SWITCH) &&
(tpt_tbl[rate] > active_tpt))) {
if (start_hi != IWL_RATE_INVALID) {
new_rate = start_hi;
break;
}
new_rate = rate;
if (low != IWL_RATE_INVALID)
rate = low;
else
break;
} else {
if (new_rate != IWL_RATE_INVALID)
break;
else if (high != IWL_RATE_INVALID) {
start_hi = high;
rate = high;
} else {
new_rate = rate;
break;
}
}
}
return new_rate;
}
#endif /* CONFIG_IWLWIFI_HT */
static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
{
return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
}
static int rs_switch_to_mimo(struct iwl_priv *priv,
struct iwl_rate_scale_priv *lq_data,
struct iwl_scale_tbl_info *tbl, int index)
{
int rc = -1;
#ifdef CONFIG_IWLWIFI_HT
u16 rate_mask;
s32 rate;
s8 is_green = lq_data->is_green;
if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
return -1;
IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
tbl->lq_type = LQ_MIMO;
rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
&rate_mask);
if (priv->current_assoc_ht.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
return -1;
if (!rs_is_both_ant_supp(lq_data->antenna))
return -1;
rc = 0;
tbl->is_dup = lq_data->is_dup;
tbl->action = 0;
if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
tbl->is_fat = 1;
else
tbl->is_fat = 0;
if (tbl->is_fat) {
if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
tbl->is_SGI = 1;
else
tbl->is_SGI = 0;
} else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
tbl->is_SGI = 1;
else
tbl->is_SGI = 0;
rs_get_expected_tpt_table(lq_data, tbl);
rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
return -1;
rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
tbl->current_rate.rate_n_flags, is_green);
#endif /*CONFIG_IWLWIFI_HT */
return rc;
}
static int rs_switch_to_siso(struct iwl_priv *priv,
struct iwl_rate_scale_priv *lq_data,
struct iwl_scale_tbl_info *tbl, int index)
{
int rc = -1;
#ifdef CONFIG_IWLWIFI_HT
u16 rate_mask;
u8 is_green = lq_data->is_green;
s32 rate;
IWL_DEBUG_HT("LQ: try to switch to SISO\n");
if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
return -1;
rc = 0;
tbl->is_dup = lq_data->is_dup;
tbl->lq_type = LQ_SISO;
tbl->action = 0;
rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
&rate_mask);
if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
tbl->is_fat = 1;
else
tbl->is_fat = 0;
if (tbl->is_fat) {
if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
tbl->is_SGI = 1;
else
tbl->is_SGI = 0;
} else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
tbl->is_SGI = 1;
else
tbl->is_SGI = 0;
if (is_green)
tbl->is_SGI = 0;
rs_get_expected_tpt_table(lq_data, tbl);
rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
rate, rate_mask);
return -1;
}
rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
tbl->current_rate.rate_n_flags, is_green);
#endif /*CONFIG_IWLWIFI_HT */
return rc;
}
static int rs_move_legacy_other(struct iwl_priv *priv,
struct iwl_rate_scale_priv *lq_data,
int index)
{
int rc = 0;
struct iwl_scale_tbl_info *tbl =
&(lq_data->lq_info[lq_data->active_tbl]);
struct iwl_scale_tbl_info *search_tbl =
&(lq_data->lq_info[(1 - lq_data->active_tbl)]);
struct iwl_rate_scale_data *window = &(tbl->win[index]);
u32 sz = (sizeof(struct iwl_scale_tbl_info) -
(sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action = tbl->action;
for (; ;) {
switch (tbl->action) {
case IWL_LEGACY_SWITCH_ANTENNA:
IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
search_tbl->lq_type = LQ_NONE;
lq_data->action_counter++;
if (window->success_ratio >= IWL_RS_GOOD_RATIO)
break;
if (!rs_is_other_ant_connected(lq_data->antenna,
tbl->antenna_type))
break;
memcpy(search_tbl, tbl, sz);
rs_toggle_antenna(&(search_tbl->current_rate),
search_tbl);
rs_get_expected_tpt_table(lq_data, search_tbl);
lq_data->search_better_tbl = 1;
goto out;
case IWL_LEGACY_SWITCH_SISO:
IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
memcpy(search_tbl, tbl, sz);
search_tbl->lq_type = LQ_SISO;
search_tbl->is_SGI = 0;
search_tbl->is_fat = 0;
rc = rs_switch_to_siso(priv, lq_data, search_tbl,
index);
if (!rc) {
lq_data->search_better_tbl = 1;
lq_data->action_counter = 0;
}
if (!rc)
goto out;
break;
case IWL_LEGACY_SWITCH_MIMO:
IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
memcpy(search_tbl, tbl, sz);
search_tbl->lq_type = LQ_MIMO;
search_tbl->is_SGI = 0;
search_tbl->is_fat = 0;
search_tbl->antenna_type = ANT_BOTH;
rc = rs_switch_to_mimo(priv, lq_data, search_tbl,
index);
if (!rc) {
lq_data->search_better_tbl = 1;
lq_data->action_counter = 0;
}
if (!rc)
goto out;
break;
}
tbl->action++;
if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
if (tbl->action == start_action)
break;
}
return 0;
out:
tbl->action++;
if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
return 0;
}
static int rs_move_siso_to_other(struct iwl_priv *priv,
struct iwl_rate_scale_priv *lq_data,
int index)
{
int rc = -1;
u8 is_green = lq_data->is_green;
struct iwl_scale_tbl_info *tbl =
&(lq_data->lq_info[lq_data->active_tbl]);
struct iwl_scale_tbl_info *search_tbl =
&(lq_data->lq_info[(1 - lq_data->active_tbl)]);
struct iwl_rate_scale_data *window = &(tbl->win[index]);
u32 sz = (sizeof(struct iwl_scale_tbl_info) -
(sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action = tbl->action;
for (;;) {
lq_data->action_counter++;
switch (tbl->action) {
case IWL_SISO_SWITCH_ANTENNA:
IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
search_tbl->lq_type = LQ_NONE;
if (window->success_ratio >= IWL_RS_GOOD_RATIO)
break;
if (!rs_is_other_ant_connected(lq_data->antenna,
tbl->antenna_type))
break;
memcpy(search_tbl, tbl, sz);
search_tbl->action = IWL_SISO_SWITCH_MIMO;
rs_toggle_antenna(&(search_tbl->current_rate),
search_tbl);
lq_data->search_better_tbl = 1;
goto out;
case IWL_SISO_SWITCH_MIMO:
IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
memcpy(search_tbl, tbl, sz);
search_tbl->lq_type = LQ_MIMO;
search_tbl->is_SGI = 0;
search_tbl->is_fat = 0;
search_tbl->antenna_type = ANT_BOTH;
rc = rs_switch_to_mimo(priv, lq_data, search_tbl,
index);
if (!rc)
lq_data->search_better_tbl = 1;
if (!rc)
goto out;
break;
case IWL_SISO_SWITCH_GI:
IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
memcpy(search_tbl, tbl, sz);
search_tbl->action = 0;
if (search_tbl->is_SGI)
search_tbl->is_SGI = 0;
else if (!is_green)
search_tbl->is_SGI = 1;
else
break;
lq_data->search_better_tbl = 1;
if ((tbl->lq_type == LQ_SISO) &&
(tbl->is_SGI)) {
s32 tpt = lq_data->last_tpt / 100;
if (((!tbl->is_fat) &&
(tpt >= expected_tpt_siso20MHz[index])) ||
((tbl->is_fat) &&
(tpt >= expected_tpt_siso40MHz[index])))
lq_data->search_better_tbl = 0;
}
rs_get_expected_tpt_table(lq_data, search_tbl);
rs_mcs_from_tbl(&search_tbl->current_rate,
search_tbl, index, is_green);
goto out;
}
tbl->action++;
if (tbl->action > IWL_SISO_SWITCH_GI)
tbl->action = IWL_SISO_SWITCH_ANTENNA;
if (tbl->action == start_action)
break;
}
return 0;
out:
tbl->action++;
if (tbl->action > IWL_SISO_SWITCH_GI)
tbl->action = IWL_SISO_SWITCH_ANTENNA;
return 0;
}
static int rs_move_mimo_to_other(struct iwl_priv *priv,
struct iwl_rate_scale_priv *lq_data,
int index)
{
int rc = -1;
s8 is_green = lq_data->is_green;
struct iwl_scale_tbl_info *tbl =
&(lq_data->lq_info[lq_data->active_tbl]);
struct iwl_scale_tbl_info *search_tbl =
&(lq_data->lq_info[(1 - lq_data->active_tbl)]);
u32 sz = (sizeof(struct iwl_scale_tbl_info) -
(sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action = tbl->action;
for (;;) {
lq_data->action_counter++;
switch (tbl->action) {
case IWL_MIMO_SWITCH_ANTENNA_A:
case IWL_MIMO_SWITCH_ANTENNA_B:
IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
memcpy(search_tbl, tbl, sz);
search_tbl->lq_type = LQ_SISO;
search_tbl->is_SGI = 0;
search_tbl->is_fat = 0;
if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
search_tbl->antenna_type = ANT_MAIN;
else
search_tbl->antenna_type = ANT_AUX;
rc = rs_switch_to_siso(priv, lq_data, search_tbl,
index);
if (!rc) {
lq_data->search_better_tbl = 1;
goto out;
}
break;
case IWL_MIMO_SWITCH_GI:
IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
memcpy(search_tbl, tbl, sz);
search_tbl->lq_type = LQ_MIMO;
search_tbl->antenna_type = ANT_BOTH;
search_tbl->action = 0;
if (search_tbl->is_SGI)
search_tbl->is_SGI = 0;
else
search_tbl->is_SGI = 1;
lq_data->search_better_tbl = 1;
if ((tbl->lq_type == LQ_MIMO) &&
(tbl->is_SGI)) {
s32 tpt = lq_data->last_tpt / 100;
if (((!tbl->is_fat) &&
(tpt >= expected_tpt_mimo20MHz[index])) ||
((tbl->is_fat) &&
(tpt >= expected_tpt_mimo40MHz[index])))
lq_data->search_better_tbl = 0;
}
rs_get_expected_tpt_table(lq_data, search_tbl);
rs_mcs_from_tbl(&search_tbl->current_rate,
search_tbl, index, is_green);
goto out;
}
tbl->action++;
if (tbl->action > IWL_MIMO_SWITCH_GI)
tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
if (tbl->action == start_action)
break;
}
return 0;
out:
tbl->action++;
if (tbl->action > IWL_MIMO_SWITCH_GI)
tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
return 0;
}
static void rs_stay_in_table(struct iwl_rate_scale_priv *lq_data)
{
struct iwl_scale_tbl_info *tbl;
int i;
int active_tbl;
int flush_interval_passed = 0;
active_tbl = lq_data->active_tbl;
tbl = &(lq_data->lq_info[active_tbl]);
if (lq_data->stay_in_tbl) {
if (lq_data->flush_timer)
flush_interval_passed =
time_after(jiffies,
(unsigned long)(lq_data->flush_timer +
IWL_RATE_SCALE_FLUSH_INTVL));
flush_interval_passed = 0;
if ((lq_data->total_failed > lq_data->max_failure_limit) ||
(lq_data->total_success > lq_data->max_success_limit) ||
((!lq_data->search_better_tbl) && (lq_data->flush_timer)
&& (flush_interval_passed))) {
IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
lq_data->total_failed,
lq_data->total_success,
flush_interval_passed);
lq_data->stay_in_tbl = 0;
lq_data->total_failed = 0;
lq_data->total_success = 0;
lq_data->flush_timer = 0;
} else if (lq_data->table_count > 0) {
lq_data->table_count++;
if (lq_data->table_count >=
lq_data->table_count_limit) {
lq_data->table_count = 0;
IWL_DEBUG_HT("LQ: stay in table clear win\n");
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(
&(tbl->win[i]));
}
}
if (!lq_data->stay_in_tbl) {
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&(tbl->win[i]));
}
}
}
static void rs_rate_scale_perform(struct iwl_priv *priv,
struct net_device *dev,
struct ieee80211_hdr *hdr,
struct sta_info *sta)
{
int low = IWL_RATE_INVALID;
int high = IWL_RATE_INVALID;
int index;
int i;
struct iwl_rate_scale_data *window = NULL;
int current_tpt = IWL_INVALID_VALUE;
int low_tpt = IWL_INVALID_VALUE;
int high_tpt = IWL_INVALID_VALUE;
u32 fail_count;
s8 scale_action = 0;
u16 fc, rate_mask;
u8 update_lq = 0;
struct iwl_rate_scale_priv *lq_data;
struct iwl_scale_tbl_info *tbl, *tbl1;
u16 rate_scale_index_msk = 0;
struct iwl_rate mcs_rate;
u8 is_green = 0;
u8 active_tbl = 0;
u8 done_search = 0;
u16 high_low;
IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
fc = le16_to_cpu(hdr->frame_control);
if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
/* Send management frames and broadcast/multicast data using
* lowest rate. */
/* TODO: this could probably be improved.. */
return;
}
if (!sta || !sta->rate_ctrl_priv)
return;
if (!priv->lq_mngr.lq_ready) {
IWL_DEBUG_RATE("still rate scaling not ready\n");
return;
}
lq_data = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
if (!lq_data->search_better_tbl)
active_tbl = lq_data->active_tbl;
else
active_tbl = 1 - lq_data->active_tbl;
tbl = &(lq_data->lq_info[active_tbl]);
is_green = lq_data->is_green;
index = sta->last_txrate;
IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
tbl->lq_type);
rs_get_supported_rates(lq_data, hdr, tbl->lq_type,
&rate_mask);
IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
/* mask with station rate restriction */
if (is_legacy(tbl->lq_type)) {
if (lq_data->phymode == (u8) MODE_IEEE80211A)
rate_scale_index_msk = (u16) (rate_mask &
(sta->supp_rates << IWL_FIRST_OFDM_RATE));
else
rate_scale_index_msk = (u16) (rate_mask &
sta->supp_rates);
} else
rate_scale_index_msk = rate_mask;
if (!rate_scale_index_msk)
rate_scale_index_msk = rate_mask;
if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
index = IWL_INVALID_VALUE;
update_lq = 1;
/* get the lowest availabe rate */
for (i = 0; i <= IWL_RATE_COUNT; i++) {
if ((1 << i) & rate_scale_index_msk)
index = i;
}
if (index == IWL_INVALID_VALUE) {
IWL_WARNING("Can not find a suitable rate\n");
return;
}
}
if (!tbl->expected_tpt)
rs_get_expected_tpt_table(lq_data, tbl);
window = &(tbl->win[index]);
fail_count = window->counter - window->success_counter;
if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
(window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
|| (tbl->expected_tpt == NULL)) {
IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
"for index %d\n",
window->success_counter, window->counter, index);
window->average_tpt = IWL_INVALID_VALUE;
rs_stay_in_table(lq_data);
if (update_lq) {
rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq, sta);
rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
}
goto out;
} else
window->average_tpt = ((window->success_ratio *
tbl->expected_tpt[index] + 64) / 128);
if (lq_data->search_better_tbl) {
int success_limit = IWL_RATE_SCALE_SWITCH;
if ((window->success_ratio > success_limit) ||
(window->average_tpt > lq_data->last_tpt)) {
if (!is_legacy(tbl->lq_type)) {
IWL_DEBUG_HT("LQ: we are switching to HT"
" rate suc %d current tpt %d"
" old tpt %d\n",
window->success_ratio,
window->average_tpt,
lq_data->last_tpt);
lq_data->enable_counter = 1;
}
lq_data->active_tbl = active_tbl;
current_tpt = window->average_tpt;
} else {
tbl->lq_type = LQ_NONE;
active_tbl = lq_data->active_tbl;
tbl = &(lq_data->lq_info[active_tbl]);
index = iwl_rate_index_from_plcp(
tbl->current_rate.rate_n_flags);
update_lq = 1;
current_tpt = lq_data->last_tpt;
IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
}
lq_data->search_better_tbl = 0;
done_search = 1;
goto lq_update;
}
high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
tbl->lq_type);
low = high_low & 0xff;
high = (high_low >> 8) & 0xff;
current_tpt = window->average_tpt;
if (low != IWL_RATE_INVALID)
low_tpt = tbl->win[low].average_tpt;
if (high != IWL_RATE_INVALID)
high_tpt = tbl->win[high].average_tpt;
scale_action = 1;
if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
(current_tpt == 0)) {
IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
scale_action = -1;
} else if ((low_tpt == IWL_INVALID_VALUE) &&
(high_tpt == IWL_INVALID_VALUE))
scale_action = 1;
else if ((low_tpt != IWL_INVALID_VALUE) &&
(high_tpt != IWL_INVALID_VALUE) &&
(low_tpt < current_tpt) &&
(high_tpt < current_tpt))
scale_action = 0;
else {
if (high_tpt != IWL_INVALID_VALUE) {
if (high_tpt > current_tpt)
scale_action = 1;
else {
IWL_DEBUG_RATE
("decrease rate because of high tpt\n");
scale_action = -1;
}
} else if (low_tpt != IWL_INVALID_VALUE) {
if (low_tpt > current_tpt) {
IWL_DEBUG_RATE
("decrease rate because of low tpt\n");
scale_action = -1;
} else
scale_action = 1;
}
}
if (scale_action == -1) {
if ((low != IWL_RATE_INVALID) &&
((window->success_ratio > IWL_RATE_HIGH_TH) ||
(current_tpt > (100 * tbl->expected_tpt[low]))))
scale_action = 0;
} else if ((scale_action == 1) &&
(window->success_ratio < IWL_RATE_INCREASE_TH))
scale_action = 0;
switch (scale_action) {
case -1:
if (low != IWL_RATE_INVALID) {
update_lq = 1;
index = low;
}
break;
case 1:
if (high != IWL_RATE_INVALID) {
update_lq = 1;
index = high;
}
break;
case 0:
default:
break;
}
IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
"high %d type %d\n",
index, scale_action, low, high, tbl->lq_type);
lq_update:
if (update_lq) {
rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq, sta);
rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
}
rs_stay_in_table(lq_data);
if (!update_lq && !done_search && !lq_data->stay_in_tbl) {
lq_data->last_tpt = current_tpt;
if (is_legacy(tbl->lq_type))
rs_move_legacy_other(priv, lq_data, index);
else if (is_siso(tbl->lq_type))
rs_move_siso_to_other(priv, lq_data, index);
else
rs_move_mimo_to_other(priv, lq_data, index);
if (lq_data->search_better_tbl) {
tbl = &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&(tbl->win[i]));
index = iwl_rate_index_from_plcp(
tbl->current_rate.rate_n_flags);
IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
tbl->current_rate.rate_n_flags, index);
rs_fill_link_cmd(lq_data, &tbl->current_rate,
&(lq_data->lq), sta);
rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
}
tbl1 = &(lq_data->lq_info[lq_data->active_tbl]);
if (is_legacy(tbl1->lq_type) &&
#ifdef CONFIG_IWLWIFI_HT
!priv->current_assoc_ht.is_ht &&
#endif
(lq_data->action_counter >= 1)) {
lq_data->action_counter = 0;
IWL_DEBUG_HT("LQ: STAY in legacy table\n");
rs_set_stay_in_table(1, lq_data);
}
if (lq_data->enable_counter &&
(lq_data->action_counter >= IWL_ACTION_LIMIT)) {
#ifdef CONFIG_IWLWIFI_HT_AGG
if ((lq_data->last_tpt > TID_AGG_TPT_THREHOLD) &&
(priv->lq_mngr.agg_ctrl.auto_agg)) {
priv->lq_mngr.agg_ctrl.tid_retry =
TID_ALL_SPECIFIED;
schedule_work(&priv->agg_work);
}
#endif /*CONFIG_IWLWIFI_HT_AGG */
lq_data->action_counter = 0;
rs_set_stay_in_table(0, lq_data);
}
} else {
if ((!update_lq) && (!done_search) && (!lq_data->flush_timer))
lq_data->flush_timer = jiffies;
}
out:
rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
i = index;
sta->last_txrate = i;
/* sta->txrate is an index to A mode rates which start
* at IWL_FIRST_OFDM_RATE
*/
if (lq_data->phymode == (u8) MODE_IEEE80211A)
sta->txrate = i - IWL_FIRST_OFDM_RATE;
else
sta->txrate = i;
return;
}
static void rs_initialize_lq(struct iwl_priv *priv,
struct sta_info *sta)
{
int i;
struct iwl_rate_scale_priv *lq;
struct iwl_scale_tbl_info *tbl;
u8 active_tbl = 0;
int rate_idx;
u8 use_green = rs_use_green(priv);
struct iwl_rate mcs_rate;
if (!sta || !sta->rate_ctrl_priv)
goto out;
lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
i = sta->last_txrate;
if ((lq->lq.sta_id == 0xff) &&
(priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
goto out;
if (!lq->search_better_tbl)
active_tbl = lq->active_tbl;
else
active_tbl = 1 - lq->active_tbl;
tbl = &(lq->lq_info[active_tbl]);
if ((i < 0) || (i >= IWL_RATE_COUNT))
i = 0;
mcs_rate.rate_n_flags = iwl_rates[i].plcp ;
mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
tbl->antenna_type = ANT_AUX;
rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx);
if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
rs_toggle_antenna(&mcs_rate, tbl),
rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
rs_get_expected_tpt_table(lq, tbl);
rs_fill_link_cmd(lq, &mcs_rate, &(lq->lq), sta);
rs_send_lq_cmd(priv, &lq->lq, CMD_ASYNC);
out:
return;
}
static struct ieee80211_rate *rs_get_lowest_rate(struct ieee80211_local
*local)
{
struct ieee80211_hw_mode *mode = local->oper_hw_mode;
int i;
for (i = 0; i < mode->num_rates; i++) {
struct ieee80211_rate *rate = &mode->rates[i];
if (rate->flags & IEEE80211_RATE_SUPPORTED)
return rate;
}
return &mode->rates[0];
}
static struct ieee80211_rate *rs_get_rate(void *priv_rate,
struct net_device *dev,
struct sk_buff *skb,
struct rate_control_extra
*extra)
{
int i;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct sta_info *sta;
u16 fc;
struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
struct iwl_rate_scale_priv *lq;
IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
memset(extra, 0, sizeof(*extra));
fc = le16_to_cpu(hdr->frame_control);
if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
/* Send management frames and broadcast/multicast data using
* lowest rate. */
/* TODO: this could probably be improved.. */
return rs_get_lowest_rate(local);
}
sta = sta_info_get(local, hdr->addr1);
if (!sta || !sta->rate_ctrl_priv) {
if (sta)
sta_info_put(sta);
return rs_get_lowest_rate(local);
}
lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
i = sta->last_txrate;
if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) {
u8 sta_id = iwl_hw_find_station(priv, hdr->addr1);
DECLARE_MAC_BUF(mac);
if (sta_id == IWL_INVALID_STATION) {
IWL_DEBUG_RATE("LQ: ADD station %s\n",
print_mac(mac, hdr->addr1));
sta_id = iwl_add_station(priv,
hdr->addr1, 0, CMD_ASYNC);
}
if ((sta_id != IWL_INVALID_STATION)) {
lq->lq.sta_id = sta_id;
lq->lq.rs_table[0].rate_n_flags = 0;
lq->ibss_sta_added = 1;
rs_initialize_lq(priv, sta);
}
if (!lq->ibss_sta_added)
goto done;
}
done:
sta_info_put(sta);
if ((i < 0) || (i > IWL_RATE_COUNT))
return rs_get_lowest_rate(local);
return &priv->ieee_rates[i];
}
static void *rs_alloc_sta(void *priv, gfp_t gfp)
{
struct iwl_rate_scale_priv *crl;
int i, j;
IWL_DEBUG_RATE("create station rate scale window\n");
crl = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp);
if (crl == NULL)
return NULL;
memset(crl, 0, sizeof(struct iwl_rate_scale_priv));
crl->lq.sta_id = 0xff;
for (j = 0; j < LQ_SIZE; j++)
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
return crl;
}
static void rs_rate_init(void *priv_rate, void *priv_sta,
struct ieee80211_local *local,
struct sta_info *sta)
{
int i, j;
struct ieee80211_hw_mode *mode = local->oper_hw_mode;
struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
struct iwl_rate_scale_priv *crl = priv_sta;
memset(crl, 0, sizeof(struct iwl_rate_scale_priv));
crl->lq.sta_id = 0xff;
crl->flush_timer = 0;
sta->txrate = 3;
for (j = 0; j < LQ_SIZE; j++)
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
IWL_DEBUG_RATE("rate scale global init\n");
/* TODO: what is a good starting rate for STA? About middle? Maybe not
* the lowest or the highest rate.. Could consider using RSSI from
* previous packets? Need to have IEEE 802.1X auth succeed immediately
* after assoc.. */
crl->ibss_sta_added = 0;
if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
u8 sta_id = iwl_hw_find_station(priv, sta->addr);
DECLARE_MAC_BUF(mac);
/* for IBSS the call are from tasklet */
IWL_DEBUG_HT("LQ: ADD station %s\n",
print_mac(mac, sta->addr));
if (sta_id == IWL_INVALID_STATION) {
IWL_DEBUG_RATE("LQ: ADD station %s\n",
print_mac(mac, sta->addr));
sta_id = iwl_add_station(priv,
sta->addr, 0, CMD_ASYNC);
}
if ((sta_id != IWL_INVALID_STATION)) {
crl->lq.sta_id = sta_id;
crl->lq.rs_table[0].rate_n_flags = 0;
}
/* FIXME: this is w/a remove it later */
priv->assoc_station_added = 1;
}
for (i = 0; i < mode->num_rates; i++) {
if ((sta->supp_rates & BIT(i)) &&
(mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
sta->txrate = i;
}
sta->last_txrate = sta->txrate;
/* For MODE_IEEE80211A mode cck rate are at end
* rate table
*/
if (local->hw.conf.phymode == MODE_IEEE80211A)
sta->last_txrate += IWL_FIRST_OFDM_RATE;
crl->is_dup = priv->is_dup;
crl->valid_antenna = priv->valid_antenna;
crl->antenna = priv->antenna;
crl->is_green = rs_use_green(priv);
crl->active_rate = priv->active_rate;
crl->active_rate &= ~(0x1000);
crl->active_rate_basic = priv->active_rate_basic;
crl->phymode = priv->phymode;
#ifdef CONFIG_IWLWIFI_HT
crl->active_siso_rate = (priv->current_assoc_ht.supp_rates[0] << 1);
crl->active_siso_rate |= (priv->current_assoc_ht.supp_rates[0] & 0x1);
crl->active_siso_rate &= ~((u16)0x2);
crl->active_siso_rate = crl->active_siso_rate << IWL_FIRST_OFDM_RATE;
crl->active_mimo_rate = (priv->current_assoc_ht.supp_rates[1] << 1);
crl->active_mimo_rate |= (priv->current_assoc_ht.supp_rates[1] & 0x1);
crl->active_mimo_rate &= ~((u16)0x2);
crl->active_mimo_rate = crl->active_mimo_rate << IWL_FIRST_OFDM_RATE;
IWL_DEBUG_HT("MIMO RATE 0x%X SISO MASK 0x%X\n", crl->active_siso_rate,
crl->active_mimo_rate);
#endif /*CONFIG_IWLWIFI_HT*/
if (priv->assoc_station_added)
priv->lq_mngr.lq_ready = 1;
rs_initialize_lq(priv, sta);
}
static int rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
struct iwl_rate *tx_mcs,
struct iwl_link_quality_cmd *lq_cmd,
struct sta_info *sta)
{
int index = 0;
int rc = 0;
int rate_idx;
u8 ant_toggle_count = 0;
u8 use_ht_possible = 1;
u8 repeat_cur_rate = 0;
struct iwl_rate new_rate;
struct iwl_scale_tbl_info tbl_type = { 0 };
rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode,
&tbl_type, &rate_idx);
if (is_legacy(tbl_type.lq_type)) {
ant_toggle_count = 1;
repeat_cur_rate = IWL_NUMBER_TRY;
} else
repeat_cur_rate = IWL_HT_NUMBER_TRY;
lq_cmd->general_params.mimo_delimiter =
is_mimo(tbl_type.lq_type) ? 1 : 0;
lq_cmd->rs_table[index].rate_n_flags =
cpu_to_le32(tx_mcs->rate_n_flags);
new_rate.rate_n_flags = tx_mcs->rate_n_flags;
if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
lq_cmd->general_params.single_stream_ant_msk = 1;
else
lq_cmd->general_params.single_stream_ant_msk = 2;
index++;
repeat_cur_rate--;
while (index < LINK_QUAL_MAX_RETRY_NUM) {
while (repeat_cur_rate && (index < LINK_QUAL_MAX_RETRY_NUM)) {
if (is_legacy(tbl_type.lq_type)) {
if (ant_toggle_count <
NUM_TRY_BEFORE_ANTENNA_TOGGLE)
ant_toggle_count++;
else {
rs_toggle_antenna(&new_rate, &tbl_type);
ant_toggle_count = 1;
}
}
lq_cmd->rs_table[index].rate_n_flags =
cpu_to_le32(new_rate.rate_n_flags);
repeat_cur_rate--;
index++;
}
rs_get_tbl_info_from_mcs(&new_rate, lq_data->phymode, &tbl_type,
&rate_idx);
if (is_mimo(tbl_type.lq_type))
lq_cmd->general_params.mimo_delimiter = index;
rs_get_lower_rate(lq_data, &tbl_type, rate_idx,
use_ht_possible, &new_rate, sta);
if (is_legacy(tbl_type.lq_type)) {
if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
ant_toggle_count++;
else {
rs_toggle_antenna(&new_rate, &tbl_type);
ant_toggle_count = 1;
}
repeat_cur_rate = IWL_NUMBER_TRY;
} else
repeat_cur_rate = IWL_HT_NUMBER_TRY;
use_ht_possible = 0;
lq_cmd->rs_table[index].rate_n_flags =
cpu_to_le32(new_rate.rate_n_flags);
/* lq_cmd->rs_table[index].rate_n_flags = 0x800d; */
index++;
repeat_cur_rate--;
}
/* lq_cmd->rs_table[0].rate_n_flags = 0x800d; */
lq_cmd->general_params.dual_stream_ant_msk = 3;
lq_cmd->agg_params.agg_dis_start_th = 3;
lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
return rc;
}
static void *rs_alloc(struct ieee80211_local *local)
{
return local->hw.priv;
}
/* rate scale requires free function to be implemented */
static void rs_free(void *priv_rate)
{
return;
}
static void rs_clear(void *priv_rate)
{
struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
IWL_DEBUG_RATE("enter\n");
priv->lq_mngr.lq_ready = 0;
#ifdef CONFIG_IWLWIFI_HT
#ifdef CONFIG_IWLWIFI_HT_AGG
if (priv->lq_mngr.agg_ctrl.granted_ba)
iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
#endif /*CONFIG_IWLWIFI_HT_AGG */
#endif /* CONFIG_IWLWIFI_HT */
IWL_DEBUG_RATE("leave\n");
}
static void rs_free_sta(void *priv, void *priv_sta)
{
struct iwl_rate_scale_priv *rs_priv = priv_sta;
IWL_DEBUG_RATE("enter\n");
kfree(rs_priv);
IWL_DEBUG_RATE("leave\n");
}
static struct rate_control_ops rs_ops = {
.module = NULL,
.name = RS_NAME,
.tx_status = rs_tx_status,
.get_rate = rs_get_rate,
.rate_init = rs_rate_init,
.clear = rs_clear,
.alloc = rs_alloc,
.free = rs_free,
.alloc_sta = rs_alloc_sta,
.free_sta = rs_free_sta,
};
int iwl_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
{
struct ieee80211_local *local = hw_to_local(hw);
struct iwl_priv *priv = hw->priv;
struct iwl_rate_scale_priv *rs_priv;
struct sta_info *sta;
int count = 0, i;
u32 samples = 0, success = 0, good = 0;
unsigned long now = jiffies;
u32 max_time = 0;
u8 lq_type, antenna;
sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
if (!sta || !sta->rate_ctrl_priv) {
if (sta) {
sta_info_put(sta);
IWL_DEBUG_RATE("leave - no private rate data!\n");
} else
IWL_DEBUG_RATE("leave - no station!\n");
return sprintf(buf, "station %d not found\n", sta_id);
}
rs_priv = (void *)sta->rate_ctrl_priv;
lq_type = rs_priv->lq_info[rs_priv->active_tbl].lq_type;
antenna = rs_priv->lq_info[rs_priv->active_tbl].antenna_type;
if (is_legacy(lq_type))
i = IWL_RATE_54M_INDEX;
else
i = IWL_RATE_60M_INDEX;
while (1) {
u64 mask;
int j;
int active = rs_priv->active_tbl;
count +=
sprintf(&buf[count], " %2dMbs: ", iwl_rates[i].ieee / 2);
mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
buf[count++] =
(rs_priv->lq_info[active].win[i].data & mask)
? '1' : '0';
samples += rs_priv->lq_info[active].win[i].counter;
good += rs_priv->lq_info[active].win[i].success_counter;
success += rs_priv->lq_info[active].win[i].success_counter *
iwl_rates[i].ieee;
if (rs_priv->lq_info[active].win[i].stamp) {
int delta =
jiffies_to_msecs(now -
rs_priv->lq_info[active].win[i].stamp);
if (delta > max_time)
max_time = delta;
count += sprintf(&buf[count], "%5dms\n", delta);
} else
buf[count++] = '\n';
j = iwl_get_prev_ieee_rate(i);
if (j == i)
break;
i = j;
}
/* Display the average rate of all samples taken.
*
* NOTE: We multiple # of samples by 2 since the IEEE measurement
* added from iwl_rates is actually 2X the rate */
if (samples)
count += sprintf(&buf[count],
"\nAverage rate is %3d.%02dMbs over last %4dms\n"
"%3d%% success (%d good packets over %d tries)\n",
success / (2 * samples), (success * 5 / samples) % 10,
max_time, good * 100 / samples, good, samples);
else
count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
count += sprintf(&buf[count], "\nrate scale type %d anntena %d "
"active_search %d rate index %d\n", lq_type, antenna,
rs_priv->search_better_tbl, sta->last_txrate);
sta_info_put(sta);
return count;
}
void iwl_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
{
struct iwl_priv *priv = hw->priv;
priv->lq_mngr.lq_ready = 1;
}
void iwl_rate_control_register(struct ieee80211_hw *hw)
{
ieee80211_rate_control_register(&rs_ops);
}
void iwl_rate_control_unregister(struct ieee80211_hw *hw)
{
ieee80211_rate_control_unregister(&rs_ops);
}
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