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/******************************************************************************
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* Copyright(c) 2005 - 2007 Intel Corporation. All rights reserved.
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
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* The full GNU General Public License is included in this distribution in the
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* file called LICENSE.
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* Contact Information:
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* James P. Ketrenos <ipw2100-admin@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*****************************************************************************/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/wireless.h>
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#include <net/mac80211.h>
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#include <net/ieee80211.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/delay.h>
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#include <linux/workqueue.h>
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#include <net/mac80211.h>
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#include <linux/wireless.h>
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#include "../net/mac80211/ieee80211_rate.h"
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#include "iwl-helpers.h"
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#define RS_NAME "iwl-4965-rs"
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#define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
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#define IWL_NUMBER_TRY 1
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#define IWL_HT_NUMBER_TRY 3
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#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
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#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
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#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
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/* max time to accum history 2 seconds */
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#define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
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static u8 rs_ht_to_legacy[] = {
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IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
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IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
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IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
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IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
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IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
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IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
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} __attribute__ ((packed));
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* struct iwl4965_rate_scale_data -- tx success history for one rate
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struct iwl4965_rate_scale_data {
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u64 data; /* bitmap of successful frames */
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s32 success_counter; /* number of frames successful */
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s32 success_ratio; /* per-cent * 128 */
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s32 counter; /* number of frames attempted */
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s32 average_tpt; /* success ratio * expected throughput */
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* struct iwl4965_scale_tbl_info -- tx params and success history for all rates
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* There are two of these in struct iwl_rate_scale_priv,
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* one for "active", and one for "search".
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struct iwl4965_scale_tbl_info {
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enum iwl4965_table_type lq_type;
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enum iwl4965_antenna_type antenna_type;
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u8 is_SGI; /* 1 = short guard interval */
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u8 is_fat; /* 1 = 40 MHz channel width */
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u8 is_dup; /* 1 = duplicated data streams */
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u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
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s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
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struct iwl4965_rate current_rate; /* rate_n_flags, uCode API format */
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struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
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* struct iwl_rate_scale_priv -- driver's rate scaling private structure
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* Pointer to this gets passed back and forth between driver and mac80211.
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struct iwl4965_lq_sta {
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u8 active_tbl; /* index of active table, range 0-1 */
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u8 enable_counter; /* indicates HT mode */
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u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
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u8 search_better_tbl; /* 1: currently trying alternate mode */
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/* The following determine when to search for a new mode */
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u32 table_count_limit;
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u32 max_failure_limit; /* # failed frames before new search */
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u32 max_success_limit; /* # successful frames before new search */
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u32 total_failed; /* total failed frames, any/all rates */
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u32 total_success; /* total successful frames, any/all rates */
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u32 flush_timer; /* time staying in mode before new search */
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u8 action_counter; /* # mode-switch actions tried */
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/* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
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u16 active_siso_rate;
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u16 active_mimo_rate;
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u16 active_rate_basic;
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struct iwl4965_link_quality_cmd lq;
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struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct dentry *rs_sta_dbgfs_scale_table_file;
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struct dentry *rs_sta_dbgfs_stats_table_file;
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struct iwl4965_rate dbg_fixed;
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struct iwl4965_priv *drv;
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static void rs_rate_scale_perform(struct iwl4965_priv *priv,
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struct net_device *dev,
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struct ieee80211_hdr *hdr,
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struct sta_info *sta);
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static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
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struct iwl4965_rate *tx_mcs,
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struct iwl4965_link_quality_cmd *tbl);
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#ifdef CONFIG_MAC80211_DEBUGFS
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static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
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struct iwl4965_rate *mcs, int index);
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static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
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struct iwl4965_rate *mcs, int index)
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* Expected throughput metrics for following rates:
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* 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
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* "G" is the only table that supports CCK (the first 4 rates).
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static s32 expected_tpt_A[IWL_RATE_COUNT] = {
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0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
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static s32 expected_tpt_G[IWL_RATE_COUNT] = {
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7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
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static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
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0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
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static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
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0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
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static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
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0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
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static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
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0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
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static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
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0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
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static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
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0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
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static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
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0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
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static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
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0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
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static int iwl4965_lq_sync_callback(struct iwl4965_priv *priv,
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struct iwl4965_cmd *cmd, struct sk_buff *skb)
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/*We didn't cache the SKB; let the caller free it */
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static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags)
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return (u8)(rate_n_flags & 0xFF);
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static int rs_send_lq_cmd(struct iwl4965_priv *priv,
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struct iwl4965_link_quality_cmd *lq, u8 flags)
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#ifdef CONFIG_IWL4965_DEBUG
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struct iwl4965_host_cmd cmd = {
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.id = REPLY_TX_LINK_QUALITY_CMD,
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.len = sizeof(struct iwl4965_link_quality_cmd),
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if ((lq->sta_id == 0xFF) &&
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(priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
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if (lq->sta_id == 0xFF)
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lq->sta_id = IWL_AP_ID;
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IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
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IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
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lq->general_params.single_stream_ant_msk,
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lq->general_params.dual_stream_ant_msk);
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#ifdef CONFIG_IWL4965_DEBUG
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for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
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IWL_DEBUG_RATE("lq index %d 0x%X\n",
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i, lq->rs_table[i].rate_n_flags);
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if (flags & CMD_ASYNC)
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cmd.meta.u.callback = iwl4965_lq_sync_callback;
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if (iwl4965_is_associated(priv) && priv->assoc_station_added &&
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priv->lq_mngr.lq_ready)
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return iwl4965_send_cmd(priv, &cmd);
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static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
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window->success_counter = 0;
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window->success_ratio = IWL_INVALID_VALUE;
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window->average_tpt = IWL_INVALID_VALUE;
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* rs_collect_tx_data - Update the success/failure sliding window
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* We keep a sliding window of the last 62 packets transmitted
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* at this rate. window->data contains the bitmask of successful
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static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
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int scale_index, s32 tpt, u32 status)
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struct iwl4965_rate_scale_data *window = NULL;
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u8 win_size = IWL_RATE_MAX_WINDOW;
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if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
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/* Select data for current tx bit rate */
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window = &(windows[scale_index]);
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* Keep track of only the latest 62 tx frame attempts in this rate's
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* history window; anything older isn't really relevant any more.
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* If we have filled up the sliding window, drop the oldest attempt;
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* if the oldest attempt (highest bit in bitmap) shows "success",
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* subtract "1" from the success counter (this is the main reason
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* we keep these bitmaps!).
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if (window->counter >= win_size) {
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window->counter = win_size - 1;
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mask = (mask << (win_size - 1));
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if ((window->data & mask)) {
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window->data &= ~mask;
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window->success_counter = window->success_counter - 1;
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/* Increment frames-attempted counter */
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window->counter = window->counter + 1;
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/* Shift bitmap by one frame (throw away oldest history),
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* OR in "1", and increment "success" if this frame was successful. */
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window->data = (mask << 1);
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window->success_counter = window->success_counter + 1;
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/* Calculate current success ratio, avoid divide-by-0! */
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if (window->counter > 0)
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window->success_ratio = 128 * (100 * window->success_counter)
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window->success_ratio = IWL_INVALID_VALUE;
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fail_count = window->counter - window->success_counter;
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/* Calculate average throughput, if we have enough history. */
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if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
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(window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
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window->average_tpt = (window->success_ratio * tpt + 64) / 128;
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window->average_tpt = IWL_INVALID_VALUE;
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/* Tag this window as having been updated */
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window->stamp = jiffies;
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* Fill uCode API rate_n_flags field, based on "search" or "active" table.
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static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
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struct iwl4965_scale_tbl_info *tbl,
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int index, u8 use_green)
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if (is_legacy(tbl->lq_type)) {
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mcs_rate->rate_n_flags = iwl4965_rates[index].plcp;
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if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
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mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
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} else if (is_siso(tbl->lq_type)) {
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if (index > IWL_LAST_OFDM_RATE)
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index = IWL_LAST_OFDM_RATE;
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mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso |
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if (index > IWL_LAST_OFDM_RATE)
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index = IWL_LAST_OFDM_RATE;
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mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo |
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switch (tbl->antenna_type) {
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mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
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mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
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mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
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if (is_legacy(tbl->lq_type))
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mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
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mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
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mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
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mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
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if (is_siso(tbl->lq_type))
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mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
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* Interpret uCode API's rate_n_flags format,
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* fill "search" or "active" tx mode table.
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static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
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int phymode, struct iwl4965_scale_tbl_info *tbl,
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index = iwl4965_rate_index_from_plcp(mcs_rate->rate_n_flags);
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if (index == IWL_RATE_INVALID) {
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tbl->is_SGI = 0; /* default legacy setup */
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tbl->antenna_type = ANT_BOTH; /* default MIMO setup */
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/* legacy rate format */
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if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
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ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
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if (ant_msk == RATE_MCS_ANT_AB_MSK)
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tbl->lq_type = LQ_NONE;
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if (phymode == MODE_IEEE80211A)
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if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
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tbl->antenna_type = ANT_MAIN;
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tbl->antenna_type = ANT_AUX;
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/* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
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} else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
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<= IWL_RATE_SISO_60M_PLCP) {
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tbl->lq_type = LQ_SISO;
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ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
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if (ant_msk == RATE_MCS_ANT_AB_MSK)
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tbl->lq_type = LQ_NONE;
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if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
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tbl->antenna_type = ANT_MAIN;
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tbl->antenna_type = ANT_AUX;
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if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
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if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
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(mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
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if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
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/* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
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tbl->lq_type = LQ_MIMO;
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if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
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if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
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(mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
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if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
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static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate,
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struct iwl4965_scale_tbl_info *tbl)
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if (tbl->antenna_type == ANT_AUX) {
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tbl->antenna_type = ANT_MAIN;
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new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
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new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
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tbl->antenna_type = ANT_AUX;
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new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
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new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
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static inline u8 rs_use_green(struct iwl4965_priv *priv)
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#ifdef CONFIG_IWL4965_HT
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if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
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return ((priv->current_assoc_ht.is_green_field) &&
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!(priv->current_assoc_ht.operating_mode & 0x4));
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#endif /*CONFIG_IWL4965_HT */
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* rs_get_supported_rates - get the available rates
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* if management frame or broadcast frame only return
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* basic available rates.
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static void rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
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struct ieee80211_hdr *hdr,
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enum iwl4965_table_type rate_type,
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if (is_legacy(rate_type))
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*data_rate = lq_sta->active_rate;
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if (is_siso(rate_type))
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*data_rate = lq_sta->active_siso_rate;
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*data_rate = lq_sta->active_mimo_rate;
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if (hdr && is_multicast_ether_addr(hdr->addr1) &&
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lq_sta->active_rate_basic) {
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*data_rate = lq_sta->active_rate_basic;
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static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
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u8 high = IWL_RATE_INVALID;
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u8 low = IWL_RATE_INVALID;
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/* 802.11A or ht walks to the next literal adjacent rate in
550
if (is_a_band(rate_type) || !is_legacy(rate_type)) {
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/* Find the previous rate that is in the rate mask */
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for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
557
if (rate_mask & mask) {
563
/* Find the next rate that is in the rate mask */
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for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
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if (rate_mask & mask) {
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return (high << 8) | low;
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while (low != IWL_RATE_INVALID) {
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low = iwl4965_rates[low].prev_rs;
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if (low == IWL_RATE_INVALID)
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if (rate_mask & (1 << low))
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IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
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while (high != IWL_RATE_INVALID) {
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high = iwl4965_rates[high].next_rs;
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if (high == IWL_RATE_INVALID)
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if (rate_mask & (1 << high))
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IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
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return (high << 8) | low;
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static void rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
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struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
600
u8 ht_possible, struct iwl4965_rate *mcs_rate)
605
u8 switch_to_legacy = 0;
606
u8 is_green = lq_sta->is_green;
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/* check if we need to switch from HT to legacy rates.
609
* assumption is that mandatory rates (1Mbps or 6Mbps)
610
* are always supported (spec demand) */
611
if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
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switch_to_legacy = 1;
613
scale_index = rs_ht_to_legacy[scale_index];
614
if (lq_sta->phymode == MODE_IEEE80211A)
619
if ((tbl->antenna_type == ANT_BOTH) ||
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(tbl->antenna_type == ANT_NONE))
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tbl->antenna_type = ANT_MAIN;
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rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask);
629
/* Mask with station rate restriction */
630
if (is_legacy(tbl->lq_type)) {
631
/* supp_rates has no CCK bits in A mode */
632
if (lq_sta->phymode == (u8) MODE_IEEE80211A)
633
rate_mask = (u16)(rate_mask &
634
(lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
636
rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
639
/* If we switched from HT to legacy, check current rate */
640
if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
641
rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
645
high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
646
low = high_low & 0xff;
648
if (low != IWL_RATE_INVALID)
649
rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
651
rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
655
* mac80211 sends us Tx status
657
static void rs_tx_status(void *priv_rate, struct net_device *dev,
659
struct iwlwifi_ieee80211_tx_status *tx_resp)
663
int rs_index, index = 0;
664
struct iwl4965_lq_sta *lq_sta;
665
struct iwl4965_link_quality_cmd *table;
666
struct sta_info *sta;
667
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
668
struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
669
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
670
struct iwl4965_rate_scale_data *window = NULL;
671
struct iwl4965_rate_scale_data *search_win = NULL;
672
struct iwl4965_rate tx_mcs;
673
struct iwl4965_scale_tbl_info tbl_type;
674
struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
676
u16 fc = le16_to_cpu(hdr->frame_control);
679
IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
681
if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
684
retries = tx_resp->retry_count;
690
sta = iwlwifi_sta_info_get(local, hdr->addr1);
692
if (!sta || !sta->rate_ctrl_priv) {
694
iwlwifi_sta_info_put(sta);
698
lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
700
if (!priv->lq_mngr.lq_ready)
703
if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
704
!lq_sta->ibss_sta_added)
708
active_index = lq_sta->active_tbl;
710
/* Get mac80211 antenna info */
712
(lq_sta->valid_antenna & local->hw.conf.antenna_sel_tx);
713
if (!lq_sta->antenna)
714
lq_sta->antenna = lq_sta->valid_antenna;
716
/* Ignore mac80211 antenna info for now */
717
lq_sta->antenna = lq_sta->valid_antenna;
719
curr_tbl = &(lq_sta->lq_info[active_index]);
720
search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
721
window = (struct iwl4965_rate_scale_data *)
723
search_win = (struct iwl4965_rate_scale_data *)
724
&(search_tbl->win[0]);
726
tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
728
rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
729
&tbl_type, &rs_index);
730
if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) {
731
IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
732
rs_index, tx_mcs.rate_n_flags);
733
iwlwifi_sta_info_put(sta);
738
* Ignore this Tx frame response if its initial rate doesn't match
739
* that of latest Link Quality command. There may be stragglers
740
* from a previous Link Quality command, but we're no longer interested
741
* in those; they're either from the "active" mode while we're trying
742
* to check "search" mode, or a prior "search" mode after we've moved
743
* to a new "search" mode (which might become the new "active" mode).
746
(tx_mcs.rate_n_flags !=
747
le32_to_cpu(table->rs_table[0].rate_n_flags))) {
748
IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
750
le32_to_cpu(table->rs_table[0].rate_n_flags));
751
iwlwifi_sta_info_put(sta);
755
/* Update frame history window with "failure" for each Tx retry. */
757
/* Look up the rate and other info used for each tx attempt.
758
* Each tx attempt steps one entry deeper in the rate table. */
759
tx_mcs.rate_n_flags =
760
le32_to_cpu(table->rs_table[index].rate_n_flags);
761
rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
762
&tbl_type, &rs_index);
764
/* If type matches "search" table,
765
* add failure to "search" history */
766
if ((tbl_type.lq_type == search_tbl->lq_type) &&
767
(tbl_type.antenna_type == search_tbl->antenna_type) &&
768
(tbl_type.is_SGI == search_tbl->is_SGI)) {
769
if (search_tbl->expected_tpt)
770
tpt = search_tbl->expected_tpt[rs_index];
773
rs_collect_tx_data(search_win, rs_index, tpt, 0);
775
/* Else if type matches "current/active" table,
776
* add failure to "current/active" history */
777
} else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
778
(tbl_type.antenna_type == curr_tbl->antenna_type) &&
779
(tbl_type.is_SGI == curr_tbl->is_SGI)) {
780
if (curr_tbl->expected_tpt)
781
tpt = curr_tbl->expected_tpt[rs_index];
784
rs_collect_tx_data(window, rs_index, tpt, 0);
787
/* If not searching for a new mode, increment failed counter
788
* ... this helps determine when to start searching again */
789
if (lq_sta->stay_in_tbl)
790
lq_sta->total_failed++;
797
* Find (by rate) the history window to update with final Tx attempt;
798
* if Tx was successful first try, use original rate,
799
* else look up the rate that was, finally, successful.
801
if (!tx_resp->retry_count)
802
tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
804
tx_mcs.rate_n_flags =
805
le32_to_cpu(table->rs_table[index].rate_n_flags);
807
rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
808
&tbl_type, &rs_index);
810
/* Update frame history window with "success" if Tx got ACKed ... */
811
if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
816
/* If type matches "search" table,
817
* add final tx status to "search" history */
818
if ((tbl_type.lq_type == search_tbl->lq_type) &&
819
(tbl_type.antenna_type == search_tbl->antenna_type) &&
820
(tbl_type.is_SGI == search_tbl->is_SGI)) {
821
if (search_tbl->expected_tpt)
822
tpt = search_tbl->expected_tpt[rs_index];
825
rs_collect_tx_data(search_win,
826
rs_index, tpt, status);
828
/* Else if type matches "current/active" table,
829
* add final tx status to "current/active" history */
830
} else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
831
(tbl_type.antenna_type == curr_tbl->antenna_type) &&
832
(tbl_type.is_SGI == curr_tbl->is_SGI)) {
833
if (curr_tbl->expected_tpt)
834
tpt = curr_tbl->expected_tpt[rs_index];
837
rs_collect_tx_data(window, rs_index, tpt, status);
840
/* If not searching for new mode, increment success/failed counter
841
* ... these help determine when to start searching again */
842
if (lq_sta->stay_in_tbl) {
844
lq_sta->total_success++;
846
lq_sta->total_failed++;
849
/* See if there's a better rate or modulation mode to try. */
850
rs_rate_scale_perform(priv, dev, hdr, sta);
851
iwlwifi_sta_info_put(sta);
855
static u8 rs_is_ant_connected(u8 valid_antenna,
856
enum iwl4965_antenna_type antenna_type)
858
if (antenna_type == ANT_AUX)
859
return ((valid_antenna & 0x2) ? 1:0);
860
else if (antenna_type == ANT_MAIN)
861
return ((valid_antenna & 0x1) ? 1:0);
862
else if (antenna_type == ANT_BOTH)
863
return ((valid_antenna & 0x3) == 0x3);
868
static u8 rs_is_other_ant_connected(u8 valid_antenna,
869
enum iwl4965_antenna_type antenna_type)
871
if (antenna_type == ANT_AUX)
872
return rs_is_ant_connected(valid_antenna, ANT_MAIN);
874
return rs_is_ant_connected(valid_antenna, ANT_AUX);
880
* Begin a period of staying with a selected modulation mode.
881
* Set "stay_in_tbl" flag to prevent any mode switches.
882
* Set frame tx success limits according to legacy vs. high-throughput,
883
* and reset overall (spanning all rates) tx success history statistics.
884
* These control how long we stay using same modulation mode before
885
* searching for a new mode.
887
static void rs_set_stay_in_table(u8 is_legacy,
888
struct iwl4965_lq_sta *lq_sta)
890
IWL_DEBUG_HT("we are staying in the same table\n");
891
lq_sta->stay_in_tbl = 1; /* only place this gets set */
893
lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
894
lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
895
lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
897
lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
898
lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
899
lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
901
lq_sta->table_count = 0;
902
lq_sta->total_failed = 0;
903
lq_sta->total_success = 0;
907
* Find correct throughput table for given mode of modulation
909
static void rs_get_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
910
struct iwl4965_scale_tbl_info *tbl)
912
if (is_legacy(tbl->lq_type)) {
913
if (!is_a_band(tbl->lq_type))
914
tbl->expected_tpt = expected_tpt_G;
916
tbl->expected_tpt = expected_tpt_A;
917
} else if (is_siso(tbl->lq_type)) {
918
if (tbl->is_fat && !lq_sta->is_dup)
920
tbl->expected_tpt = expected_tpt_siso40MHzSGI;
922
tbl->expected_tpt = expected_tpt_siso40MHz;
923
else if (tbl->is_SGI)
924
tbl->expected_tpt = expected_tpt_siso20MHzSGI;
926
tbl->expected_tpt = expected_tpt_siso20MHz;
928
} else if (is_mimo(tbl->lq_type)) {
929
if (tbl->is_fat && !lq_sta->is_dup)
931
tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
933
tbl->expected_tpt = expected_tpt_mimo40MHz;
934
else if (tbl->is_SGI)
935
tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
937
tbl->expected_tpt = expected_tpt_mimo20MHz;
939
tbl->expected_tpt = expected_tpt_G;
942
#ifdef CONFIG_IWL4965_HT
944
* Find starting rate for new "search" high-throughput mode of modulation.
945
* Goal is to find lowest expected rate (under perfect conditions) that is
946
* above the current measured throughput of "active" mode, to give new mode
947
* a fair chance to prove itself without too many challenges.
949
* This gets called when transitioning to more aggressive modulation
950
* (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
951
* (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
952
* to decrease to match "active" throughput. When moving from MIMO to SISO,
953
* bit rate will typically need to increase, but not if performance was bad.
955
static s32 rs_get_best_rate(struct iwl4965_priv *priv,
956
struct iwl4965_lq_sta *lq_sta,
957
struct iwl4965_scale_tbl_info *tbl, /* "search" */
958
u16 rate_mask, s8 index, s8 rate)
960
/* "active" values */
961
struct iwl4965_scale_tbl_info *active_tbl =
962
&(lq_sta->lq_info[lq_sta->active_tbl]);
963
s32 active_sr = active_tbl->win[index].success_ratio;
964
s32 active_tpt = active_tbl->expected_tpt[index];
966
/* expected "search" throughput */
967
s32 *tpt_tbl = tbl->expected_tpt;
969
s32 new_rate, high, low, start_hi;
972
new_rate = high = low = start_hi = IWL_RATE_INVALID;
975
high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
977
low = high_low & 0xff;
978
high = (high_low >> 8) & 0xff;
981
* Lower the "search" bit rate, to give new "search" mode
982
* approximately the same throughput as "active" if:
984
* 1) "Active" mode has been working modestly well (but not
985
* great), and expected "search" throughput (under perfect
986
* conditions) at candidate rate is above the actual
987
* measured "active" throughput (but less than expected
988
* "active" throughput under perfect conditions).
990
* 2) "Active" mode has been working perfectly or very well
991
* and expected "search" throughput (under perfect
992
* conditions) at candidate rate is above expected
993
* "active" throughput (under perfect conditions).
995
if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
996
((active_sr > IWL_RATE_DECREASE_TH) &&
997
(active_sr <= IWL_RATE_HIGH_TH) &&
998
(tpt_tbl[rate] <= active_tpt))) ||
999
((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1000
(tpt_tbl[rate] > active_tpt))) {
1002
/* (2nd or later pass)
1003
* If we've already tried to raise the rate, and are
1004
* now trying to lower it, use the higher rate. */
1005
if (start_hi != IWL_RATE_INVALID) {
1006
new_rate = start_hi;
1012
/* Loop again with lower rate */
1013
if (low != IWL_RATE_INVALID)
1016
/* Lower rate not available, use the original */
1020
/* Else try to raise the "search" rate to match "active" */
1022
/* (2nd or later pass)
1023
* If we've already tried to lower the rate, and are
1024
* now trying to raise it, use the lower rate. */
1025
if (new_rate != IWL_RATE_INVALID)
1028
/* Loop again with higher rate */
1029
else if (high != IWL_RATE_INVALID) {
1033
/* Higher rate not available, use the original */
1043
#endif /* CONFIG_IWL4965_HT */
1045
static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1047
return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
1051
* Set up search table for MIMO
1053
static int rs_switch_to_mimo(struct iwl4965_priv *priv,
1054
struct iwl4965_lq_sta *lq_sta,
1055
struct iwl4965_scale_tbl_info *tbl, int index)
1057
#ifdef CONFIG_IWL4965_HT
1060
s8 is_green = lq_sta->is_green;
1062
if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
1065
IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1066
tbl->lq_type = LQ_MIMO;
1067
rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1070
if (priv->current_assoc_ht.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1073
/* Need both Tx chains/antennas to support MIMO */
1074
if (!rs_is_both_ant_supp(lq_sta->antenna))
1077
tbl->is_dup = lq_sta->is_dup;
1079
if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
1085
if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
1089
} else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
1094
rs_get_expected_tpt_table(lq_sta, tbl);
1096
rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1098
IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
1099
if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
1101
rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1103
IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1104
tbl->current_rate.rate_n_flags, is_green);
1108
#endif /*CONFIG_IWL4965_HT */
1112
* Set up search table for SISO
1114
static int rs_switch_to_siso(struct iwl4965_priv *priv,
1115
struct iwl4965_lq_sta *lq_sta,
1116
struct iwl4965_scale_tbl_info *tbl, int index)
1118
#ifdef CONFIG_IWL4965_HT
1121
u8 is_green = lq_sta->is_green;
1123
IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1124
if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
1127
tbl->is_dup = lq_sta->is_dup;
1128
tbl->lq_type = LQ_SISO;
1130
rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1133
if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
1139
if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
1143
} else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY) {
1152
rs_get_expected_tpt_table(lq_sta, tbl);
1153
rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1155
IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1156
if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1157
IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1161
rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1162
IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1163
tbl->current_rate.rate_n_flags, is_green);
1168
#endif /*CONFIG_IWL4965_HT */
1172
* Try to switch to new modulation mode from legacy
1174
static int rs_move_legacy_other(struct iwl4965_priv *priv,
1175
struct iwl4965_lq_sta *lq_sta,
1179
struct iwl4965_scale_tbl_info *tbl =
1180
&(lq_sta->lq_info[lq_sta->active_tbl]);
1181
struct iwl4965_scale_tbl_info *search_tbl =
1182
&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1183
struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1184
u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1185
(sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1186
u8 start_action = tbl->action;
1189
switch (tbl->action) {
1190
case IWL_LEGACY_SWITCH_ANTENNA:
1191
IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1193
search_tbl->lq_type = LQ_NONE;
1194
lq_sta->action_counter++;
1196
/* Don't change antenna if success has been great */
1197
if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1200
/* Don't change antenna if other one is not connected */
1201
if (!rs_is_other_ant_connected(lq_sta->antenna,
1205
/* Set up search table to try other antenna */
1206
memcpy(search_tbl, tbl, sz);
1208
rs_toggle_antenna(&(search_tbl->current_rate),
1210
rs_get_expected_tpt_table(lq_sta, search_tbl);
1211
lq_sta->search_better_tbl = 1;
1214
case IWL_LEGACY_SWITCH_SISO:
1215
IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1217
/* Set up search table to try SISO */
1218
memcpy(search_tbl, tbl, sz);
1219
search_tbl->lq_type = LQ_SISO;
1220
search_tbl->is_SGI = 0;
1221
search_tbl->is_fat = 0;
1222
ret = rs_switch_to_siso(priv, lq_sta, search_tbl,
1225
lq_sta->search_better_tbl = 1;
1226
lq_sta->action_counter = 0;
1231
case IWL_LEGACY_SWITCH_MIMO:
1232
IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1234
/* Set up search table to try MIMO */
1235
memcpy(search_tbl, tbl, sz);
1236
search_tbl->lq_type = LQ_MIMO;
1237
search_tbl->is_SGI = 0;
1238
search_tbl->is_fat = 0;
1239
search_tbl->antenna_type = ANT_BOTH;
1240
ret = rs_switch_to_mimo(priv, lq_sta, search_tbl,
1243
lq_sta->search_better_tbl = 1;
1244
lq_sta->action_counter = 0;
1250
if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1251
tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1253
if (tbl->action == start_action)
1261
if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1262
tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1268
* Try to switch to new modulation mode from SISO
1270
static int rs_move_siso_to_other(struct iwl4965_priv *priv,
1271
struct iwl4965_lq_sta *lq_sta,
1275
u8 is_green = lq_sta->is_green;
1276
struct iwl4965_scale_tbl_info *tbl =
1277
&(lq_sta->lq_info[lq_sta->active_tbl]);
1278
struct iwl4965_scale_tbl_info *search_tbl =
1279
&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1280
struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1281
u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1282
(sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1283
u8 start_action = tbl->action;
1286
lq_sta->action_counter++;
1287
switch (tbl->action) {
1288
case IWL_SISO_SWITCH_ANTENNA:
1289
IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1290
search_tbl->lq_type = LQ_NONE;
1291
if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1293
if (!rs_is_other_ant_connected(lq_sta->antenna,
1297
memcpy(search_tbl, tbl, sz);
1298
search_tbl->action = IWL_SISO_SWITCH_MIMO;
1299
rs_toggle_antenna(&(search_tbl->current_rate),
1301
lq_sta->search_better_tbl = 1;
1305
case IWL_SISO_SWITCH_MIMO:
1306
IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1307
memcpy(search_tbl, tbl, sz);
1308
search_tbl->lq_type = LQ_MIMO;
1309
search_tbl->is_SGI = 0;
1310
search_tbl->is_fat = 0;
1311
search_tbl->antenna_type = ANT_BOTH;
1312
ret = rs_switch_to_mimo(priv, lq_sta, search_tbl,
1315
lq_sta->search_better_tbl = 1;
1319
case IWL_SISO_SWITCH_GI:
1320
IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1321
memcpy(search_tbl, tbl, sz);
1322
search_tbl->action = 0;
1323
if (search_tbl->is_SGI)
1324
search_tbl->is_SGI = 0;
1326
search_tbl->is_SGI = 1;
1329
lq_sta->search_better_tbl = 1;
1330
if ((tbl->lq_type == LQ_SISO) &&
1332
s32 tpt = lq_sta->last_tpt / 100;
1333
if (((!tbl->is_fat) &&
1334
(tpt >= expected_tpt_siso20MHz[index])) ||
1336
(tpt >= expected_tpt_siso40MHz[index])))
1337
lq_sta->search_better_tbl = 0;
1339
rs_get_expected_tpt_table(lq_sta, search_tbl);
1340
rs_mcs_from_tbl(&search_tbl->current_rate,
1341
search_tbl, index, is_green);
1345
if (tbl->action > IWL_SISO_SWITCH_GI)
1346
tbl->action = IWL_SISO_SWITCH_ANTENNA;
1348
if (tbl->action == start_action)
1355
if (tbl->action > IWL_SISO_SWITCH_GI)
1356
tbl->action = IWL_SISO_SWITCH_ANTENNA;
1361
* Try to switch to new modulation mode from MIMO
1363
static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
1364
struct iwl4965_lq_sta *lq_sta,
1368
s8 is_green = lq_sta->is_green;
1369
struct iwl4965_scale_tbl_info *tbl =
1370
&(lq_sta->lq_info[lq_sta->active_tbl]);
1371
struct iwl4965_scale_tbl_info *search_tbl =
1372
&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1373
u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1374
(sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1375
u8 start_action = tbl->action;
1378
lq_sta->action_counter++;
1379
switch (tbl->action) {
1380
case IWL_MIMO_SWITCH_ANTENNA_A:
1381
case IWL_MIMO_SWITCH_ANTENNA_B:
1382
IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1384
/* Set up new search table for SISO */
1385
memcpy(search_tbl, tbl, sz);
1386
search_tbl->lq_type = LQ_SISO;
1387
search_tbl->is_SGI = 0;
1388
search_tbl->is_fat = 0;
1389
if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1390
search_tbl->antenna_type = ANT_MAIN;
1392
search_tbl->antenna_type = ANT_AUX;
1394
ret = rs_switch_to_siso(priv, lq_sta, search_tbl,
1397
lq_sta->search_better_tbl = 1;
1402
case IWL_MIMO_SWITCH_GI:
1403
IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1405
/* Set up new search table for MIMO */
1406
memcpy(search_tbl, tbl, sz);
1407
search_tbl->lq_type = LQ_MIMO;
1408
search_tbl->antenna_type = ANT_BOTH;
1409
search_tbl->action = 0;
1410
if (search_tbl->is_SGI)
1411
search_tbl->is_SGI = 0;
1413
search_tbl->is_SGI = 1;
1414
lq_sta->search_better_tbl = 1;
1417
* If active table already uses the fastest possible
1418
* modulation (dual stream with short guard interval),
1419
* and it's working well, there's no need to look
1420
* for a better type of modulation!
1422
if ((tbl->lq_type == LQ_MIMO) &&
1424
s32 tpt = lq_sta->last_tpt / 100;
1425
if (((!tbl->is_fat) &&
1426
(tpt >= expected_tpt_mimo20MHz[index])) ||
1428
(tpt >= expected_tpt_mimo40MHz[index])))
1429
lq_sta->search_better_tbl = 0;
1431
rs_get_expected_tpt_table(lq_sta, search_tbl);
1432
rs_mcs_from_tbl(&search_tbl->current_rate,
1433
search_tbl, index, is_green);
1438
if (tbl->action > IWL_MIMO_SWITCH_GI)
1439
tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1441
if (tbl->action == start_action)
1448
if (tbl->action > IWL_MIMO_SWITCH_GI)
1449
tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1455
* Check whether we should continue using same modulation mode, or
1456
* begin search for a new mode, based on:
1457
* 1) # tx successes or failures while using this mode
1458
* 2) # times calling this function
1459
* 3) elapsed time in this mode (not used, for now)
1461
static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1463
struct iwl4965_scale_tbl_info *tbl;
1466
int flush_interval_passed = 0;
1468
active_tbl = lq_sta->active_tbl;
1470
tbl = &(lq_sta->lq_info[active_tbl]);
1472
/* If we've been disallowing search, see if we should now allow it */
1473
if (lq_sta->stay_in_tbl) {
1475
/* Elapsed time using current modulation mode */
1476
if (lq_sta->flush_timer)
1477
flush_interval_passed =
1479
(unsigned long)(lq_sta->flush_timer +
1480
IWL_RATE_SCALE_FLUSH_INTVL));
1482
/* For now, disable the elapsed time criterion */
1483
flush_interval_passed = 0;
1486
* Check if we should allow search for new modulation mode.
1487
* If many frames have failed or succeeded, or we've used
1488
* this same modulation for a long time, allow search, and
1489
* reset history stats that keep track of whether we should
1490
* allow a new search. Also (below) reset all bitmaps and
1491
* stats in active history.
1493
if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1494
(lq_sta->total_success > lq_sta->max_success_limit) ||
1495
((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1496
&& (flush_interval_passed))) {
1497
IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1498
lq_sta->total_failed,
1499
lq_sta->total_success,
1500
flush_interval_passed);
1502
/* Allow search for new mode */
1503
lq_sta->stay_in_tbl = 0; /* only place reset */
1504
lq_sta->total_failed = 0;
1505
lq_sta->total_success = 0;
1506
lq_sta->flush_timer = 0;
1509
* Else if we've used this modulation mode enough repetitions
1510
* (regardless of elapsed time or success/failure), reset
1511
* history bitmaps and rate-specific stats for all rates in
1515
lq_sta->table_count++;
1516
if (lq_sta->table_count >=
1517
lq_sta->table_count_limit) {
1518
lq_sta->table_count = 0;
1520
IWL_DEBUG_HT("LQ: stay in table clear win\n");
1521
for (i = 0; i < IWL_RATE_COUNT; i++)
1522
rs_rate_scale_clear_window(
1527
/* If transitioning to allow "search", reset all history
1528
* bitmaps and stats in active table (this will become the new
1529
* "search" table). */
1530
if (!lq_sta->stay_in_tbl) {
1531
for (i = 0; i < IWL_RATE_COUNT; i++)
1532
rs_rate_scale_clear_window(&(tbl->win[i]));
1538
* Do rate scaling and search for new modulation mode.
1540
static void rs_rate_scale_perform(struct iwl4965_priv *priv,
1541
struct net_device *dev,
1542
struct ieee80211_hdr *hdr,
1543
struct sta_info *sta)
1545
int low = IWL_RATE_INVALID;
1546
int high = IWL_RATE_INVALID;
1549
struct iwl4965_rate_scale_data *window = NULL;
1550
int current_tpt = IWL_INVALID_VALUE;
1551
int low_tpt = IWL_INVALID_VALUE;
1552
int high_tpt = IWL_INVALID_VALUE;
1554
s8 scale_action = 0;
1557
struct iwl4965_lq_sta *lq_sta;
1558
struct iwl4965_scale_tbl_info *tbl, *tbl1;
1559
u16 rate_scale_index_msk = 0;
1560
struct iwl4965_rate mcs_rate;
1566
IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1568
fc = le16_to_cpu(hdr->frame_control);
1569
if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1570
/* Send management frames and broadcast/multicast data using
1572
/* TODO: this could probably be improved.. */
1576
if (!sta || !sta->rate_ctrl_priv)
1579
if (!priv->lq_mngr.lq_ready) {
1580
IWL_DEBUG_RATE("still rate scaling not ready\n");
1583
lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1586
* Select rate-scale / modulation-mode table to work with in
1587
* the rest of this function: "search" if searching for better
1588
* modulation mode, or "active" if doing rate scaling within a mode.
1590
if (!lq_sta->search_better_tbl)
1591
active_tbl = lq_sta->active_tbl;
1593
active_tbl = 1 - lq_sta->active_tbl;
1595
tbl = &(lq_sta->lq_info[active_tbl]);
1596
is_green = lq_sta->is_green;
1598
/* current tx rate */
1599
index = sta->last_txrate;
1601
IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1604
/* rates available for this association, and for modulation mode */
1605
rs_get_supported_rates(lq_sta, hdr, tbl->lq_type,
1608
IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1610
/* mask with station rate restriction */
1611
if (is_legacy(tbl->lq_type)) {
1612
if (lq_sta->phymode == (u8) MODE_IEEE80211A)
1613
/* supp_rates has no CCK bits in A mode */
1614
rate_scale_index_msk = (u16) (rate_mask &
1615
(lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1617
rate_scale_index_msk = (u16) (rate_mask &
1618
lq_sta->supp_rates);
1621
rate_scale_index_msk = rate_mask;
1623
if (!rate_scale_index_msk)
1624
rate_scale_index_msk = rate_mask;
1626
/* If current rate is no longer supported on current association,
1627
* or user changed preferences for rates, find a new supported rate. */
1628
if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1629
index = IWL_INVALID_VALUE;
1632
/* get the highest available rate */
1633
for (i = 0; i <= IWL_RATE_COUNT; i++) {
1634
if ((1 << i) & rate_scale_index_msk)
1638
if (index == IWL_INVALID_VALUE) {
1639
IWL_WARNING("Can not find a suitable rate\n");
1644
/* Get expected throughput table and history window for current rate */
1645
if (!tbl->expected_tpt)
1646
rs_get_expected_tpt_table(lq_sta, tbl);
1648
window = &(tbl->win[index]);
1651
* If there is not enough history to calculate actual average
1652
* throughput, keep analyzing results of more tx frames, without
1653
* changing rate or mode (bypass most of the rest of this function).
1654
* Set up new rate table in uCode only if old rate is not supported
1655
* in current association (use new rate found above).
1657
fail_count = window->counter - window->success_counter;
1658
if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1659
(window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1660
|| (tbl->expected_tpt == NULL)) {
1661
IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1663
window->success_counter, window->counter, index);
1665
/* Can't calculate this yet; not enough history */
1666
window->average_tpt = IWL_INVALID_VALUE;
1668
/* Should we stay with this modulation mode,
1669
* or search for a new one? */
1670
rs_stay_in_table(lq_sta);
1672
/* Set up new rate table in uCode, if needed */
1674
rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1675
rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
1676
rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1680
/* Else we have enough samples; calculate estimate of
1681
* actual average throughput */
1683
window->average_tpt = ((window->success_ratio *
1684
tbl->expected_tpt[index] + 64) / 128);
1686
/* If we are searching for better modulation mode, check success. */
1687
if (lq_sta->search_better_tbl) {
1688
int success_limit = IWL_RATE_SCALE_SWITCH;
1690
/* If good success, continue using the "search" mode;
1691
* no need to send new link quality command, since we're
1692
* continuing to use the setup that we've been trying. */
1693
if ((window->success_ratio > success_limit) ||
1694
(window->average_tpt > lq_sta->last_tpt)) {
1695
if (!is_legacy(tbl->lq_type)) {
1696
IWL_DEBUG_HT("LQ: we are switching to HT"
1697
" rate suc %d current tpt %d"
1699
window->success_ratio,
1700
window->average_tpt,
1702
lq_sta->enable_counter = 1;
1704
/* Swap tables; "search" becomes "active" */
1705
lq_sta->active_tbl = active_tbl;
1706
current_tpt = window->average_tpt;
1708
/* Else poor success; go back to mode in "active" table */
1710
/* Nullify "search" table */
1711
tbl->lq_type = LQ_NONE;
1713
/* Revert to "active" table */
1714
active_tbl = lq_sta->active_tbl;
1715
tbl = &(lq_sta->lq_info[active_tbl]);
1717
/* Revert to "active" rate and throughput info */
1718
index = iwl4965_rate_index_from_plcp(
1719
tbl->current_rate.rate_n_flags);
1720
current_tpt = lq_sta->last_tpt;
1722
/* Need to set up a new rate table in uCode */
1724
IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1727
/* Either way, we've made a decision; modulation mode
1728
* search is done, allow rate adjustment next time. */
1729
lq_sta->search_better_tbl = 0;
1730
done_search = 1; /* Don't switch modes below! */
1734
/* (Else) not in search of better modulation mode, try for better
1735
* starting rate, while staying in this mode. */
1736
high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1738
low = high_low & 0xff;
1739
high = (high_low >> 8) & 0xff;
1741
/* Collect measured throughputs for current and adjacent rates */
1742
current_tpt = window->average_tpt;
1743
if (low != IWL_RATE_INVALID)
1744
low_tpt = tbl->win[low].average_tpt;
1745
if (high != IWL_RATE_INVALID)
1746
high_tpt = tbl->win[high].average_tpt;
1748
/* Assume rate increase */
1751
/* Too many failures, decrease rate */
1752
if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1753
(current_tpt == 0)) {
1754
IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1757
/* No throughput measured yet for adjacent rates; try increase. */
1758
} else if ((low_tpt == IWL_INVALID_VALUE) &&
1759
(high_tpt == IWL_INVALID_VALUE))
1762
/* Both adjacent throughputs are measured, but neither one has better
1763
* throughput; we're using the best rate, don't change it! */
1764
else if ((low_tpt != IWL_INVALID_VALUE) &&
1765
(high_tpt != IWL_INVALID_VALUE) &&
1766
(low_tpt < current_tpt) &&
1767
(high_tpt < current_tpt))
1770
/* At least one adjacent rate's throughput is measured,
1771
* and may have better performance. */
1773
/* Higher adjacent rate's throughput is measured */
1774
if (high_tpt != IWL_INVALID_VALUE) {
1775
/* Higher rate has better throughput */
1776
if (high_tpt > current_tpt)
1780
("decrease rate because of high tpt\n");
1784
/* Lower adjacent rate's throughput is measured */
1785
} else if (low_tpt != IWL_INVALID_VALUE) {
1786
/* Lower rate has better throughput */
1787
if (low_tpt > current_tpt) {
1789
("decrease rate because of low tpt\n");
1796
/* Sanity check; asked for decrease, but success rate or throughput
1797
* has been good at old rate. Don't change it. */
1798
if (scale_action == -1) {
1799
if ((low != IWL_RATE_INVALID) &&
1800
((window->success_ratio > IWL_RATE_HIGH_TH) ||
1801
(current_tpt > (100 * tbl->expected_tpt[low]))))
1804
/* Sanity check; asked for increase, but success rate has not been great
1805
* even at old rate, higher rate will be worse. Don't change it. */
1806
} else if ((scale_action == 1) &&
1807
(window->success_ratio < IWL_RATE_INCREASE_TH))
1810
switch (scale_action) {
1812
/* Decrease starting rate, update uCode's rate table */
1813
if (low != IWL_RATE_INVALID) {
1819
/* Increase starting rate, update uCode's rate table */
1820
if (high != IWL_RATE_INVALID) {
1832
IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1833
"high %d type %d\n",
1834
index, scale_action, low, high, tbl->lq_type);
1837
/* Replace uCode's rate table for the destination station. */
1839
rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1840
rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
1841
rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1844
/* Should we stay with this modulation mode, or search for a new one? */
1845
rs_stay_in_table(lq_sta);
1848
* Search for new modulation mode if we're:
1849
* 1) Not changing rates right now
1850
* 2) Not just finishing up a search
1851
* 3) Allowing a new search
1853
if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
1854
/* Save current throughput to compare with "search" throughput*/
1855
lq_sta->last_tpt = current_tpt;
1857
/* Select a new "search" modulation mode to try.
1858
* If one is found, set up the new "search" table. */
1859
if (is_legacy(tbl->lq_type))
1860
rs_move_legacy_other(priv, lq_sta, index);
1861
else if (is_siso(tbl->lq_type))
1862
rs_move_siso_to_other(priv, lq_sta, index);
1864
rs_move_mimo_to_other(priv, lq_sta, index);
1866
/* If new "search" mode was selected, set up in uCode table */
1867
if (lq_sta->search_better_tbl) {
1868
/* Access the "search" table, clear its history. */
1869
tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1870
for (i = 0; i < IWL_RATE_COUNT; i++)
1871
rs_rate_scale_clear_window(&(tbl->win[i]));
1873
/* Use new "search" start rate */
1874
index = iwl4965_rate_index_from_plcp(
1875
tbl->current_rate.rate_n_flags);
1877
IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
1878
tbl->current_rate.rate_n_flags, index);
1879
rs_fill_link_cmd(lq_sta, &tbl->current_rate,
1881
rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1884
/* If the "active" (non-search) mode was legacy,
1885
* and we've tried switching antennas,
1886
* but we haven't been able to try HT modes (not available),
1887
* stay with best antenna legacy modulation for a while
1888
* before next round of mode comparisons. */
1889
tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1890
if (is_legacy(tbl1->lq_type) &&
1891
#ifdef CONFIG_IWL4965_HT
1892
!priv->current_assoc_ht.is_ht &&
1894
(lq_sta->action_counter >= 1)) {
1895
lq_sta->action_counter = 0;
1896
IWL_DEBUG_HT("LQ: STAY in legacy table\n");
1897
rs_set_stay_in_table(1, lq_sta);
1900
/* If we're in an HT mode, and all 3 mode switch actions
1901
* have been tried and compared, stay in this best modulation
1902
* mode for a while before next round of mode comparisons. */
1903
if (lq_sta->enable_counter &&
1904
(lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
1905
#ifdef CONFIG_IWL4965_HT_AGG
1906
/* If appropriate, set up aggregation! */
1907
if ((lq_sta->last_tpt > TID_AGG_TPT_THREHOLD) &&
1908
(priv->lq_mngr.agg_ctrl.auto_agg)) {
1909
priv->lq_mngr.agg_ctrl.tid_retry =
1911
schedule_work(&priv->agg_work);
1913
#endif /*CONFIG_IWL4965_HT_AGG */
1914
lq_sta->action_counter = 0;
1915
rs_set_stay_in_table(0, lq_sta);
1919
* Else, don't search for a new modulation mode.
1920
* Put new timestamp in stay-in-modulation-mode flush timer if:
1921
* 1) Not changing rates right now
1922
* 2) Not just finishing up a search
1923
* 3) flush timer is empty
1926
if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
1927
lq_sta->flush_timer = jiffies;
1931
rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
1933
sta->last_txrate = i;
1935
/* sta->txrate is an index to A mode rates which start
1936
* at IWL_FIRST_OFDM_RATE
1938
if (lq_sta->phymode == (u8) MODE_IEEE80211A)
1939
sta->txrate = i - IWL_FIRST_OFDM_RATE;
1943
sta->antenna_sel_tx = tbl->lq_type;
1949
static void rs_initialize_lq(struct iwl4965_priv *priv,
1950
struct sta_info *sta)
1953
struct iwl4965_lq_sta *lq_sta;
1954
struct iwl4965_scale_tbl_info *tbl;
1957
u8 use_green = rs_use_green(priv);
1958
struct iwl4965_rate mcs_rate;
1960
if (!sta || !sta->rate_ctrl_priv)
1963
lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1964
i = sta->last_txrate;
1966
if ((lq_sta->lq.sta_id == 0xff) &&
1967
(priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
1970
if (!lq_sta->search_better_tbl)
1971
active_tbl = lq_sta->active_tbl;
1973
active_tbl = 1 - lq_sta->active_tbl;
1975
tbl = &(lq_sta->lq_info[active_tbl]);
1977
if ((i < 0) || (i >= IWL_RATE_COUNT))
1980
mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ;
1981
mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
1982
mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
1984
if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
1985
mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
1987
tbl->antenna_type = ANT_AUX;
1988
rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx);
1989
if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
1990
rs_toggle_antenna(&mcs_rate, tbl);
1992
rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
1993
tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
1994
rs_get_expected_tpt_table(lq_sta, tbl);
1995
rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
1996
rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2001
static struct ieee80211_rate *rs_get_lowest_rate(struct ieee80211_local
2004
struct ieee80211_hw_mode *mode = local->oper_hw_mode;
2007
for (i = 0; i < mode->num_rates; i++) {
2008
struct ieee80211_rate *rate = &mode->rates[i];
2010
if (rate->flags & IEEE80211_RATE_SUPPORTED)
2014
return &mode->rates[0];
2017
static struct ieee80211_rate *rs_get_rate(void *priv_rate,
2018
struct net_device *dev,
2019
struct sk_buff *skb,
2020
struct rate_control_extra
2025
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2026
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2027
struct sta_info *sta;
2029
struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
2030
struct iwl4965_lq_sta *lq_sta;
2032
IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2034
memset(extra, 0, sizeof(*extra));
2036
fc = le16_to_cpu(hdr->frame_control);
2037
if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
2038
/* Send management frames and broadcast/multicast data using
2040
/* TODO: this could probably be improved.. */
2041
return rs_get_lowest_rate(local);
2044
sta = iwlwifi_sta_info_get(local, hdr->addr1);
2046
if (!sta || !sta->rate_ctrl_priv) {
2048
iwlwifi_sta_info_put(sta);
2049
return rs_get_lowest_rate(local);
2052
lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2053
i = sta->last_txrate;
2055
if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2056
!lq_sta->ibss_sta_added) {
2057
u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1);
2059
if (sta_id == IWL_INVALID_STATION) {
2060
IWL_DEBUG_RATE("LQ: ADD station " MAC_FMT "\n",
2061
MAC_ARG(hdr->addr1));
2062
sta_id = iwl4965_add_station_flags(priv,
2063
hdr->addr1, 0, CMD_ASYNC);
2065
if ((sta_id != IWL_INVALID_STATION)) {
2066
lq_sta->lq.sta_id = sta_id;
2067
lq_sta->lq.rs_table[0].rate_n_flags = 0;
2068
lq_sta->ibss_sta_added = 1;
2069
rs_initialize_lq(priv, sta);
2071
if (!lq_sta->ibss_sta_added)
2076
iwlwifi_sta_info_put(sta);
2077
if ((i < 0) || (i > IWL_RATE_COUNT))
2078
return rs_get_lowest_rate(local);
2080
return &priv->ieee_rates[i];
2083
static void *rs_alloc_sta(void *priv, gfp_t gfp)
2085
struct iwl4965_lq_sta *lq_sta;
2088
IWL_DEBUG_RATE("create station rate scale window\n");
2090
lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2094
lq_sta->lq.sta_id = 0xff;
2097
for (j = 0; j < LQ_SIZE; j++)
2098
for (i = 0; i < IWL_RATE_COUNT; i++)
2099
rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2104
static void rs_rate_init(void *priv_rate, void *priv_sta,
2105
struct ieee80211_local *local,
2106
struct sta_info *sta)
2109
struct ieee80211_hw_mode *mode = local->oper_hw_mode;
2110
struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
2111
struct iwl4965_lq_sta *lq_sta = priv_sta;
2113
lq_sta->flush_timer = 0;
2114
lq_sta->supp_rates = sta->supp_rates;
2116
for (j = 0; j < LQ_SIZE; j++)
2117
for (i = 0; i < IWL_RATE_COUNT; i++)
2118
rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2120
IWL_DEBUG_RATE("rate scale global init\n");
2121
/* TODO: what is a good starting rate for STA? About middle? Maybe not
2122
* the lowest or the highest rate.. Could consider using RSSI from
2123
* previous packets? Need to have IEEE 802.1X auth succeed immediately
2126
lq_sta->ibss_sta_added = 0;
2127
if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2128
u8 sta_id = iwl4965_hw_find_station(priv, sta->addr);
2129
/* for IBSS the call are from tasklet */
2130
IWL_DEBUG_HT("LQ: ADD station " MAC_FMT " \n",
2131
MAC_ARG(sta->addr));
2133
if (sta_id == IWL_INVALID_STATION) {
2134
IWL_DEBUG_RATE("LQ: ADD station " MAC_FMT "\n",
2135
MAC_ARG(sta->addr));
2136
sta_id = iwl4965_add_station_flags(priv,
2137
sta->addr, 0, CMD_ASYNC);
2139
if ((sta_id != IWL_INVALID_STATION)) {
2140
lq_sta->lq.sta_id = sta_id;
2141
lq_sta->lq.rs_table[0].rate_n_flags = 0;
2143
/* FIXME: this is w/a remove it later */
2144
priv->assoc_station_added = 1;
2147
/* Find highest tx rate supported by hardware and destination station */
2148
for (i = 0; i < mode->num_rates; i++) {
2149
if ((sta->supp_rates & BIT(i)) &&
2150
(mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
2153
sta->last_txrate = sta->txrate;
2154
/* For MODE_IEEE80211A, cck rates are at end of rate table */
2155
if (local->hw.conf.phymode == MODE_IEEE80211A)
2156
sta->last_txrate += IWL_FIRST_OFDM_RATE;
2158
lq_sta->is_dup = priv->is_dup;
2159
lq_sta->valid_antenna = priv->valid_antenna;
2160
lq_sta->antenna = priv->antenna;
2161
lq_sta->is_green = rs_use_green(priv);
2162
lq_sta->active_rate = priv->active_rate;
2163
lq_sta->active_rate &= ~(0x1000);
2164
lq_sta->active_rate_basic = priv->active_rate_basic;
2165
lq_sta->phymode = priv->phymode;
2166
#ifdef CONFIG_IWL4965_HT
2168
* active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2169
* supp_rates[] does not; shift to convert format, force 9 MBits off.
2171
lq_sta->active_siso_rate = (priv->current_assoc_ht.supp_rates[0] << 1);
2172
lq_sta->active_siso_rate |=
2173
(priv->current_assoc_ht.supp_rates[0] & 0x1);
2174
lq_sta->active_siso_rate &= ~((u16)0x2);
2175
lq_sta->active_siso_rate =
2176
lq_sta->active_siso_rate << IWL_FIRST_OFDM_RATE;
2179
lq_sta->active_mimo_rate = (priv->current_assoc_ht.supp_rates[1] << 1);
2180
lq_sta->active_mimo_rate |=
2181
(priv->current_assoc_ht.supp_rates[1] & 0x1);
2182
lq_sta->active_mimo_rate &= ~((u16)0x2);
2183
lq_sta->active_mimo_rate =
2184
lq_sta->active_mimo_rate << IWL_FIRST_OFDM_RATE;
2185
IWL_DEBUG_HT("SISO RATE 0x%X MIM0 RATE 0x%X\n",
2186
lq_sta->active_siso_rate,
2187
lq_sta->active_mimo_rate);
2188
#endif /*CONFIG_IWL4965_HT*/
2189
#ifdef CONFIG_MAC80211_DEBUGFS
2193
if (priv->assoc_station_added)
2194
priv->lq_mngr.lq_ready = 1;
2196
rs_initialize_lq(priv, sta);
2199
static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
2200
struct iwl4965_rate *tx_mcs,
2201
struct iwl4965_link_quality_cmd *lq_cmd)
2205
int repeat_rate = 0;
2206
u8 ant_toggle_count = 0;
2207
u8 use_ht_possible = 1;
2208
struct iwl4965_rate new_rate;
2209
struct iwl4965_scale_tbl_info tbl_type = { 0 };
2211
/* Override starting rate (index 0) if needed for debug purposes */
2212
rs_dbgfs_set_mcs(lq_sta, tx_mcs, index);
2214
/* Interpret rate_n_flags */
2215
rs_get_tbl_info_from_mcs(tx_mcs, lq_sta->phymode,
2216
&tbl_type, &rate_idx);
2218
/* How many times should we repeat the initial rate? */
2219
if (is_legacy(tbl_type.lq_type)) {
2220
ant_toggle_count = 1;
2221
repeat_rate = IWL_NUMBER_TRY;
2223
repeat_rate = IWL_HT_NUMBER_TRY;
2225
lq_cmd->general_params.mimo_delimiter =
2226
is_mimo(tbl_type.lq_type) ? 1 : 0;
2228
/* Fill 1st table entry (index 0) */
2229
lq_cmd->rs_table[index].rate_n_flags =
2230
cpu_to_le32(tx_mcs->rate_n_flags);
2231
new_rate.rate_n_flags = tx_mcs->rate_n_flags;
2233
if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
2234
lq_cmd->general_params.single_stream_ant_msk
2235
= LINK_QUAL_ANT_A_MSK;
2237
lq_cmd->general_params.single_stream_ant_msk
2238
= LINK_QUAL_ANT_B_MSK;
2243
/* Fill rest of rate table */
2244
while (index < LINK_QUAL_MAX_RETRY_NUM) {
2245
/* Repeat initial/next rate.
2246
* For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2247
* For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2248
while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2249
if (is_legacy(tbl_type.lq_type)) {
2250
if (ant_toggle_count <
2251
NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2254
rs_toggle_antenna(&new_rate, &tbl_type);
2255
ant_toggle_count = 1;
2259
/* Override next rate if needed for debug purposes */
2260
rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2262
/* Fill next table entry */
2263
lq_cmd->rs_table[index].rate_n_flags =
2264
cpu_to_le32(new_rate.rate_n_flags);
2269
rs_get_tbl_info_from_mcs(&new_rate, lq_sta->phymode, &tbl_type,
2272
/* Indicate to uCode which entries might be MIMO.
2273
* If initial rate was MIMO, this will finally end up
2274
* as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2275
if (is_mimo(tbl_type.lq_type))
2276
lq_cmd->general_params.mimo_delimiter = index;
2279
rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2280
use_ht_possible, &new_rate);
2282
/* How many times should we repeat the next rate? */
2283
if (is_legacy(tbl_type.lq_type)) {
2284
if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2287
rs_toggle_antenna(&new_rate, &tbl_type);
2288
ant_toggle_count = 1;
2290
repeat_rate = IWL_NUMBER_TRY;
2292
repeat_rate = IWL_HT_NUMBER_TRY;
2294
/* Don't allow HT rates after next pass.
2295
* rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2296
use_ht_possible = 0;
2298
/* Override next rate if needed for debug purposes */
2299
rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2301
/* Fill next table entry */
2302
lq_cmd->rs_table[index].rate_n_flags =
2303
cpu_to_le32(new_rate.rate_n_flags);
2309
lq_cmd->general_params.dual_stream_ant_msk = 3;
2310
lq_cmd->agg_params.agg_dis_start_th = 3;
2311
lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2314
static void *rs_alloc(struct ieee80211_local *local)
2316
return local->hw.priv;
2318
/* rate scale requires free function to be implemented */
2319
static void rs_free(void *priv_rate)
2324
static void rs_clear(void *priv_rate)
2326
struct iwl4965_priv *priv = (struct iwl4965_priv *) priv_rate;
2328
IWL_DEBUG_RATE("enter\n");
2330
priv->lq_mngr.lq_ready = 0;
2331
#ifdef CONFIG_IWL4965_HT
2332
#ifdef CONFIG_IWL4965_HT_AGG
2333
if (priv->lq_mngr.agg_ctrl.granted_ba)
2334
iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
2335
#endif /*CONFIG_IWL4965_HT_AGG */
2336
#endif /* CONFIG_IWL4965_HT */
2338
IWL_DEBUG_RATE("leave\n");
2341
static void rs_free_sta(void *priv, void *priv_sta)
2343
struct iwl4965_lq_sta *lq_sta = priv_sta;
2345
IWL_DEBUG_RATE("enter\n");
2347
IWL_DEBUG_RATE("leave\n");
2351
#ifdef CONFIG_MAC80211_DEBUGFS
2352
static int open_file_generic(struct inode *inode, struct file *file)
2354
file->private_data = inode->i_private;
2357
static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2358
struct iwl4965_rate *mcs, int index)
2362
if (lq_sta->phymode == (u8) MODE_IEEE80211A)
2367
if (lq_sta->dbg_fixed.rate_n_flags) {
2369
mcs->rate_n_flags = lq_sta->dbg_fixed.rate_n_flags;
2371
mcs->rate_n_flags = base_rate;
2372
IWL_DEBUG_RATE("Fixed rate ON\n");
2376
IWL_DEBUG_RATE("Fixed rate OFF\n");
2379
static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2380
const char __user *user_buf, size_t count, loff_t *ppos)
2382
struct iwl4965_lq_sta *lq_sta = file->private_data;
2387
memset(buf, 0, sizeof(buf));
2388
buf_size = min(count, sizeof(buf) - 1);
2389
if (copy_from_user(buf, user_buf, buf_size))
2392
if (sscanf(buf, "%x", &parsed_rate) == 1)
2393
lq_sta->dbg_fixed.rate_n_flags = parsed_rate;
2395
lq_sta->dbg_fixed.rate_n_flags = 0;
2397
lq_sta->active_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2398
lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2399
lq_sta->active_mimo_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2401
IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2402
lq_sta->lq.sta_id, lq_sta->dbg_fixed.rate_n_flags);
2404
if (lq_sta->dbg_fixed.rate_n_flags) {
2405
rs_fill_link_cmd(lq_sta, &lq_sta->dbg_fixed, &lq_sta->lq);
2406
rs_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2412
static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2413
char __user *user_buf, size_t count, loff_t *ppos)
2419
struct iwl4965_lq_sta *lq_sta = file->private_data;
2421
desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2422
desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2423
lq_sta->total_failed, lq_sta->total_success,
2424
lq_sta->active_rate);
2425
desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2426
lq_sta->dbg_fixed.rate_n_flags);
2427
desc += sprintf(buff+desc, "general:"
2428
"flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2429
lq_sta->lq.general_params.flags,
2430
lq_sta->lq.general_params.mimo_delimiter,
2431
lq_sta->lq.general_params.single_stream_ant_msk,
2432
lq_sta->lq.general_params.dual_stream_ant_msk);
2434
desc += sprintf(buff+desc, "agg:"
2435
"time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2436
le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2437
lq_sta->lq.agg_params.agg_dis_start_th,
2438
lq_sta->lq.agg_params.agg_frame_cnt_limit);
2440
desc += sprintf(buff+desc,
2441
"Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2442
lq_sta->lq.general_params.start_rate_index[0],
2443
lq_sta->lq.general_params.start_rate_index[1],
2444
lq_sta->lq.general_params.start_rate_index[2],
2445
lq_sta->lq.general_params.start_rate_index[3]);
2448
for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2449
desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2450
i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2452
return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2455
static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2456
.write = rs_sta_dbgfs_scale_table_write,
2457
.read = rs_sta_dbgfs_scale_table_read,
2458
.open = open_file_generic,
2460
static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2461
char __user *user_buf, size_t count, loff_t *ppos)
2467
struct iwl4965_lq_sta *lq_sta = file->private_data;
2468
for (i = 0; i < LQ_SIZE; i++) {
2469
desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2471
lq_sta->active_tbl == i?"*":"x",
2472
lq_sta->lq_info[i].lq_type,
2473
lq_sta->lq_info[i].is_SGI,
2474
lq_sta->lq_info[i].is_fat,
2475
lq_sta->lq_info[i].is_dup,
2476
lq_sta->lq_info[i].current_rate.rate_n_flags);
2477
for (j = 0; j < IWL_RATE_COUNT; j++) {
2478
desc += sprintf(buff+desc,
2479
"counter=%d success=%d %%=%d\n",
2480
lq_sta->lq_info[i].win[j].counter,
2481
lq_sta->lq_info[i].win[j].success_counter,
2482
lq_sta->lq_info[i].win[j].success_ratio);
2485
return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2488
static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2489
.read = rs_sta_dbgfs_stats_table_read,
2490
.open = open_file_generic,
2493
static void rs_add_debugfs(void *priv, void *priv_sta,
2496
struct iwl4965_lq_sta *lq_sta = priv_sta;
2497
lq_sta->rs_sta_dbgfs_scale_table_file =
2498
debugfs_create_file("rate_scale_table", 0600, dir,
2499
lq_sta, &rs_sta_dbgfs_scale_table_ops);
2500
lq_sta->rs_sta_dbgfs_stats_table_file =
2501
debugfs_create_file("rate_stats_table", 0600, dir,
2502
lq_sta, &rs_sta_dbgfs_stats_table_ops);
2505
static void rs_remove_debugfs(void *priv, void *priv_sta)
2507
struct iwl4965_lq_sta *lq_sta = priv_sta;
2508
debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2509
debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2513
static struct rate_control_ops rs_ops = {
2516
.tx_status = rs_tx_status,
2517
.get_rate = rs_get_rate,
2518
.rate_init = rs_rate_init,
2522
.alloc_sta = rs_alloc_sta,
2523
.free_sta = rs_free_sta,
2524
#ifdef CONFIG_MAC80211_DEBUGFS
2525
.add_sta_debugfs = rs_add_debugfs,
2526
.remove_sta_debugfs = rs_remove_debugfs,
2530
int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2532
struct ieee80211_local *local = hw_to_local(hw);
2533
struct iwl4965_priv *priv = hw->priv;
2534
struct iwl4965_lq_sta *lq_sta;
2535
struct sta_info *sta;
2537
u32 samples = 0, success = 0, good = 0;
2538
unsigned long now = jiffies;
2540
u8 lq_type, antenna;
2542
sta = iwlwifi_sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2543
if (!sta || !sta->rate_ctrl_priv) {
2545
iwlwifi_sta_info_put(sta);
2546
IWL_DEBUG_RATE("leave - no private rate data!\n");
2548
IWL_DEBUG_RATE("leave - no station!\n");
2549
return sprintf(buf, "station %d not found\n", sta_id);
2552
lq_sta = (void *)sta->rate_ctrl_priv;
2554
lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2555
antenna = lq_sta->lq_info[lq_sta->active_tbl].antenna_type;
2557
if (is_legacy(lq_type))
2558
i = IWL_RATE_54M_INDEX;
2560
i = IWL_RATE_60M_INDEX;
2564
int active = lq_sta->active_tbl;
2567
sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2569
mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2570
for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2572
(lq_sta->lq_info[active].win[i].data & mask)
2575
samples += lq_sta->lq_info[active].win[i].counter;
2576
good += lq_sta->lq_info[active].win[i].success_counter;
2577
success += lq_sta->lq_info[active].win[i].success_counter *
2578
iwl4965_rates[i].ieee;
2580
if (lq_sta->lq_info[active].win[i].stamp) {
2582
jiffies_to_msecs(now -
2583
lq_sta->lq_info[active].win[i].stamp);
2585
if (delta > max_time)
2588
cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2592
j = iwl4965_get_prev_ieee_rate(i);
2598
/* Display the average rate of all samples taken.
2600
* NOTE: We multiply # of samples by 2 since the IEEE measurement
2601
* added from iwl4965_rates is actually 2X the rate */
2603
cnt += sprintf(&buf[cnt],
2604
"\nAverage rate is %3d.%02dMbs over last %4dms\n"
2605
"%3d%% success (%d good packets over %d tries)\n",
2606
success / (2 * samples), (success * 5 / samples) % 10,
2607
max_time, good * 100 / samples, good, samples);
2609
cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2611
cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2612
"active_search %d rate index %d\n", lq_type, antenna,
2613
lq_sta->search_better_tbl, sta->last_txrate);
2615
iwlwifi_sta_info_put(sta);
2619
void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2621
struct iwl4965_priv *priv = hw->priv;
2623
priv->lq_mngr.lq_ready = 1;
2626
void iwl4965_rate_control_register(struct ieee80211_hw *hw)
2628
iwlwifi_ieee80211_rate_control_register(&rs_ops);
2631
void iwl4965_rate_control_unregister(struct ieee80211_hw *hw)
2633
iwlwifi_ieee80211_rate_control_unregister(&rs_ops);
added
removed
updates/wireless/iwlwifi/iwlwifi/origin/iwl-4965-rs.c
