2598 lines
74 KiB
C
2598 lines
74 KiB
C
/******************************************************************************
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*
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* Copyright(c) 2005 - 2007 Intel Corporation. All rights reserved.
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*
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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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*
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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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* more details.
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*
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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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*
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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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*
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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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*****************************************************************************/
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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/ieee80211_rate.h"
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#include "iwl-4965.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,
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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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};
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struct iwl4965_rate {
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u32 rate_n_flags;
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} __attribute__ ((packed));
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/**
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* struct iwl4965_rate_scale_data -- tx success history for one rate
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*/
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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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unsigned long stamp;
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};
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/**
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* struct iwl4965_scale_tbl_info -- tx params and success history for all rates
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*
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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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*/
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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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};
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/**
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* struct iwl_rate_scale_priv -- driver's rate scaling private structure
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*
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* Pointer to this gets passed back and forth between driver and mac80211.
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*/
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struct iwl4965_rate_scale_priv {
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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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s32 last_tpt;
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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 table_count;
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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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u8 antenna;
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u8 valid_antenna;
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u8 is_green;
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u8 is_dup;
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u8 phymode;
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u8 ibss_sta_added;
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/* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
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u32 supp_rates;
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u16 active_rate;
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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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#endif
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};
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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_rate_scale_priv *lq_data,
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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_rate_scale_priv *rs_priv,
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struct iwl4965_rate *mcs, int index);
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#else
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static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv,
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struct iwl4965_rate *mcs, int index)
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{}
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#endif
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/*
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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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*/
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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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};
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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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};
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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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};
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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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};
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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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};
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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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};
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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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};
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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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};
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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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};
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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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};
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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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{
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/*We didn't cache the SKB; let the caller free it */
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return 1;
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}
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static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags)
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{
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return (u8)(rate_n_flags & 0xFF);
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}
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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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{
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#ifdef CONFIG_IWL4965_DEBUG
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int i;
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#endif
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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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.meta.flags = flags,
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.data = lq,
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};
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if ((lq->sta_id == 0xFF) &&
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(priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
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return -EINVAL;
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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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#endif
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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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return 0;
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}
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static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
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{
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window->data = 0;
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window->success_counter = 0;
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window->success_ratio = IWL_INVALID_VALUE;
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window->counter = 0;
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window->average_tpt = IWL_INVALID_VALUE;
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window->stamp = 0;
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}
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/**
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* rs_collect_tx_data - Update the success/failure sliding window
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*
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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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* packets.
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*/
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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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{
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struct iwl4965_rate_scale_data *window = NULL;
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u64 mask;
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u8 win_size = IWL_RATE_MAX_WINDOW;
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s32 fail_count;
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if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
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return -EINVAL;
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/* Select data for current tx bit rate */
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window = &(windows[scale_index]);
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/*
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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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*/
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if (window->counter >= win_size) {
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window->counter = win_size - 1;
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mask = 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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}
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}
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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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mask = window->data;
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window->data = (mask << 1);
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if (status != 0) {
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window->success_counter = window->success_counter + 1;
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window->data |= 0x1;
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}
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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->counter;
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else
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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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else
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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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return 0;
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}
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/*
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* Fill uCode API rate_n_flags field, based on "search" or "active" table.
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*/
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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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{
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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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RATE_MCS_HT_MSK;
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} else {
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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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RATE_MCS_HT_MSK;
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}
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switch (tbl->antenna_type) {
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case ANT_BOTH:
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mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
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break;
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case ANT_MAIN:
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mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
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break;
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case ANT_AUX:
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mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
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break;
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case ANT_NONE:
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break;
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}
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if (is_legacy(tbl->lq_type))
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return;
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if (tbl->is_fat) {
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if (tbl->is_dup)
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mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
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else
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mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
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}
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if (tbl->is_SGI)
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mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
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if (use_green) {
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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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}
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}
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/*
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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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*/
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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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int *rate_idx)
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{
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int index;
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u32 ant_msk;
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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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*rate_idx = -1;
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return -EINVAL;
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}
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tbl->is_SGI = 0; /* default legacy setup */
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tbl->is_fat = 0;
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tbl->is_dup = 0;
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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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else {
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if (phymode == MODE_IEEE80211A)
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tbl->lq_type = LQ_A;
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else
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tbl->lq_type = LQ_G;
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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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else
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tbl->antenna_type = ANT_AUX;
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}
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*rate_idx = index;
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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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else {
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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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else
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tbl->antenna_type = ANT_AUX;
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}
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if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
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tbl->is_SGI = 1;
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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;
|
|
|
|
/* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
|
|
} 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 iwl4965_rate *new_rate,
|
|
struct iwl4965_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 u8 rs_use_green(struct iwl4965_priv *priv)
|
|
{
|
|
#ifdef CONFIG_IWL4965_HT
|
|
if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
|
|
return 0;
|
|
|
|
return ((priv->current_assoc_ht.is_green_field) &&
|
|
!(priv->current_assoc_ht.operating_mode & 0x4));
|
|
#endif /*CONFIG_IWL4965_HT */
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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 iwl4965_rate_scale_priv *lq_data,
|
|
struct ieee80211_hdr *hdr,
|
|
enum iwl4965_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 adjacent rate in
|
|
* the rate table */
|
|
if (is_a_band(rate_type) || !is_legacy(rate_type)) {
|
|
int i;
|
|
u32 mask;
|
|
|
|
/* Find the previous rate that is in the rate mask */
|
|
i = index - 1;
|
|
for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
|
|
if (rate_mask & mask) {
|
|
low = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Find the next rate that is in the rate mask */
|
|
i = index + 1;
|
|
for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
|
|
if (rate_mask & mask) {
|
|
high = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (high << 8) | low;
|
|
}
|
|
|
|
low = index;
|
|
while (low != IWL_RATE_INVALID) {
|
|
low = iwl4965_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 = iwl4965_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 void rs_get_lower_rate(struct iwl4965_rate_scale_priv *lq_data,
|
|
struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
|
|
u8 ht_possible, struct iwl4965_rate *mcs_rate)
|
|
{
|
|
s32 low;
|
|
u16 rate_mask;
|
|
u16 high_low;
|
|
u8 switch_to_legacy = 0;
|
|
u8 is_green = lq_data->is_green;
|
|
|
|
/* 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)) {
|
|
/* supp_rates has no CCK bits in A mode */
|
|
if (lq_data->phymode == (u8) MODE_IEEE80211A)
|
|
rate_mask = (u16)(rate_mask &
|
|
(lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
|
|
else
|
|
rate_mask = (u16)(rate_mask & lq_data->supp_rates);
|
|
}
|
|
|
|
/* If we 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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* mac80211 sends us Tx status
|
|
*/
|
|
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 iwl4965_rate_scale_priv *lq;
|
|
struct iwl4965_link_quality_cmd *table;
|
|
struct sta_info *sta;
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
|
|
struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
|
|
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
|
|
struct iwl4965_rate_scale_data *window = NULL;
|
|
struct iwl4965_rate_scale_data *search_win = NULL;
|
|
struct iwl4965_rate tx_mcs;
|
|
struct iwl4965_scale_tbl_info tbl_type;
|
|
struct iwl4965_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_LIMIT("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 iwl4965_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;
|
|
|
|
/* Get mac80211 antenna info */
|
|
lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx);
|
|
if (!lq->antenna)
|
|
lq->antenna = lq->valid_antenna;
|
|
|
|
/* Ignore mac80211 antenna info for now */
|
|
lq->antenna = lq->valid_antenna;
|
|
|
|
curr_tbl = &(lq->lq_info[active_index]);
|
|
search_tbl = &(lq->lq_info[(1 - active_index)]);
|
|
window = (struct iwl4965_rate_scale_data *)
|
|
&(curr_tbl->win[0]);
|
|
search_win = (struct iwl4965_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;
|
|
}
|
|
|
|
/*
|
|
* Ignore this Tx frame response if its initial rate doesn't match
|
|
* that of latest Link Quality command. There may be stragglers
|
|
* from a previous Link Quality command, but we're no longer interested
|
|
* in those; they're either from the "active" mode while we're trying
|
|
* to check "search" mode, or a prior "search" mode after we've moved
|
|
* to a new "search" mode (which might become the new "active" mode).
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/* Update frame history window with "failure" for each Tx retry. */
|
|
while (retries) {
|
|
/* Look up the rate and other info used for each tx attempt.
|
|
* Each tx attempt steps one entry deeper in the rate table. */
|
|
tx_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 type matches "search" table,
|
|
* add failure to "search" history */
|
|
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 type matches "current/active" table,
|
|
* add failure to "current/active" history */
|
|
} 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 not searching for a new mode, increment failed counter
|
|
* ... this helps determine when to start searching again */
|
|
if (lq->stay_in_tbl)
|
|
lq->total_failed++;
|
|
--retries;
|
|
index++;
|
|
|
|
}
|
|
|
|
/*
|
|
* Find (by rate) the history window to update with final Tx attempt;
|
|
* if Tx was successful first try, use original rate,
|
|
* else look up the rate that was, finally, successful.
|
|
*/
|
|
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);
|
|
|
|
/* Update frame history window with "success" if Tx got ACKed ... */
|
|
if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
|
|
status = 1;
|
|
else
|
|
status = 0;
|
|
|
|
/* If type matches "search" table,
|
|
* add final tx status to "search" history */
|
|
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 type matches "current/active" table,
|
|
* add final tx status to "current/active" history */
|
|
} else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
|
|
(tbl_type.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 not searching for new mode, increment success/failed counter
|
|
* ... these help determine when to start searching again */
|
|
if (lq->stay_in_tbl) {
|
|
if (status)
|
|
lq->total_success++;
|
|
else
|
|
lq->total_failed++;
|
|
}
|
|
|
|
/* See if there's a better rate or modulation mode to try. */
|
|
rs_rate_scale_perform(priv, dev, hdr, sta);
|
|
sta_info_put(sta);
|
|
return;
|
|
}
|
|
|
|
static u8 rs_is_ant_connected(u8 valid_antenna,
|
|
enum iwl4965_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)
|
|
return ((valid_antenna & 0x3) == 0x3);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static u8 rs_is_other_ant_connected(u8 valid_antenna,
|
|
enum iwl4965_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;
|
|
}
|
|
|
|
/*
|
|
* Begin a period of staying with a selected modulation mode.
|
|
* Set "stay_in_tbl" flag to prevent any mode switches.
|
|
* Set frame tx success limits according to legacy vs. high-throughput,
|
|
* and reset overall (spanning all rates) tx success history statistics.
|
|
* These control how long we stay using same modulation mode before
|
|
* searching for a new mode.
|
|
*/
|
|
static void rs_set_stay_in_table(u8 is_legacy,
|
|
struct iwl4965_rate_scale_priv *lq_data)
|
|
{
|
|
IWL_DEBUG_HT("we are staying in the same table\n");
|
|
lq_data->stay_in_tbl = 1; /* only place this gets set */
|
|
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_SUCCESS_LIMIT;
|
|
} 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;
|
|
}
|
|
|
|
/*
|
|
* Find correct throughput table for given mode of modulation
|
|
*/
|
|
static void rs_get_expected_tpt_table(struct iwl4965_rate_scale_priv *lq_data,
|
|
struct iwl4965_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_IWL4965_HT
|
|
/*
|
|
* Find starting rate for new "search" high-throughput mode of modulation.
|
|
* Goal is to find lowest expected rate (under perfect conditions) that is
|
|
* above the current measured throughput of "active" mode, to give new mode
|
|
* a fair chance to prove itself without too many challenges.
|
|
*
|
|
* This gets called when transitioning to more aggressive modulation
|
|
* (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
|
|
* (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
|
|
* to decrease to match "active" throughput. When moving from MIMO to SISO,
|
|
* bit rate will typically need to increase, but not if performance was bad.
|
|
*/
|
|
static s32 rs_get_best_rate(struct iwl4965_priv *priv,
|
|
struct iwl4965_rate_scale_priv *lq_data,
|
|
struct iwl4965_scale_tbl_info *tbl, /* "search" */
|
|
u16 rate_mask, s8 index, s8 rate)
|
|
{
|
|
/* "active" values */
|
|
struct iwl4965_scale_tbl_info *active_tbl =
|
|
&(lq_data->lq_info[lq_data->active_tbl]);
|
|
s32 active_sr = active_tbl->win[index].success_ratio;
|
|
s32 active_tpt = active_tbl->expected_tpt[index];
|
|
|
|
/* expected "search" throughput */
|
|
s32 *tpt_tbl = tbl->expected_tpt;
|
|
|
|
s32 new_rate, high, low, start_hi;
|
|
u16 high_low;
|
|
|
|
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;
|
|
|
|
/*
|
|
* Lower the "search" bit rate, to give new "search" mode
|
|
* approximately the same throughput as "active" if:
|
|
*
|
|
* 1) "Active" mode has been working modestly well (but not
|
|
* great), and expected "search" throughput (under perfect
|
|
* conditions) at candidate rate is above the actual
|
|
* measured "active" throughput (but less than expected
|
|
* "active" throughput under perfect conditions).
|
|
* OR
|
|
* 2) "Active" mode has been working perfectly or very well
|
|
* and expected "search" throughput (under perfect
|
|
* conditions) at candidate rate is above expected
|
|
* "active" throughput (under perfect conditions).
|
|
*/
|
|
if ((((100 * tpt_tbl[rate]) > lq_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))) {
|
|
|
|
/* (2nd or later pass)
|
|
* If we've already tried to raise the rate, and are
|
|
* now trying to lower it, use the higher rate. */
|
|
if (start_hi != IWL_RATE_INVALID) {
|
|
new_rate = start_hi;
|
|
break;
|
|
}
|
|
|
|
new_rate = rate;
|
|
|
|
/* Loop again with lower rate */
|
|
if (low != IWL_RATE_INVALID)
|
|
rate = low;
|
|
|
|
/* Lower rate not available, use the original */
|
|
else
|
|
break;
|
|
|
|
/* Else try to raise the "search" rate to match "active" */
|
|
} else {
|
|
/* (2nd or later pass)
|
|
* If we've already tried to lower the rate, and are
|
|
* now trying to raise it, use the lower rate. */
|
|
if (new_rate != IWL_RATE_INVALID)
|
|
break;
|
|
|
|
/* Loop again with higher rate */
|
|
else if (high != IWL_RATE_INVALID) {
|
|
start_hi = high;
|
|
rate = high;
|
|
|
|
/* Higher rate not available, use the original */
|
|
} else {
|
|
new_rate = rate;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return new_rate;
|
|
}
|
|
#endif /* CONFIG_IWL4965_HT */
|
|
|
|
static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
|
|
{
|
|
return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
|
|
}
|
|
|
|
/*
|
|
* Set up search table for MIMO
|
|
*/
|
|
static int rs_switch_to_mimo(struct iwl4965_priv *priv,
|
|
struct iwl4965_rate_scale_priv *lq_data,
|
|
struct iwl4965_scale_tbl_info *tbl, int index)
|
|
{
|
|
#ifdef CONFIG_IWL4965_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;
|
|
|
|
/* Need both Tx chains/antennas to support MIMO */
|
|
if (!rs_is_both_ant_supp(lq_data->antenna))
|
|
return -1;
|
|
|
|
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);
|
|
return 0;
|
|
#else
|
|
return -1;
|
|
#endif /*CONFIG_IWL4965_HT */
|
|
}
|
|
|
|
/*
|
|
* Set up search table for SISO
|
|
*/
|
|
static int rs_switch_to_siso(struct iwl4965_priv *priv,
|
|
struct iwl4965_rate_scale_priv *lq_data,
|
|
struct iwl4965_scale_tbl_info *tbl, int index)
|
|
{
|
|
#ifdef CONFIG_IWL4965_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;
|
|
|
|
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);
|
|
return 0;
|
|
#else
|
|
return -1;
|
|
|
|
#endif /*CONFIG_IWL4965_HT */
|
|
}
|
|
|
|
/*
|
|
* Try to switch to new modulation mode from legacy
|
|
*/
|
|
static int rs_move_legacy_other(struct iwl4965_priv *priv,
|
|
struct iwl4965_rate_scale_priv *lq_data,
|
|
int index)
|
|
{
|
|
int ret = 0;
|
|
struct iwl4965_scale_tbl_info *tbl =
|
|
&(lq_data->lq_info[lq_data->active_tbl]);
|
|
struct iwl4965_scale_tbl_info *search_tbl =
|
|
&(lq_data->lq_info[(1 - lq_data->active_tbl)]);
|
|
struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
|
|
u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
|
|
(sizeof(struct iwl4965_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++;
|
|
|
|
/* Don't change antenna if success has been great */
|
|
if (window->success_ratio >= IWL_RS_GOOD_RATIO)
|
|
break;
|
|
|
|
/* Don't change antenna if other one is not connected */
|
|
if (!rs_is_other_ant_connected(lq_data->antenna,
|
|
tbl->antenna_type))
|
|
break;
|
|
|
|
/* Set up search table to try other antenna */
|
|
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");
|
|
|
|
/* Set up search table to try SISO */
|
|
memcpy(search_tbl, tbl, sz);
|
|
search_tbl->lq_type = LQ_SISO;
|
|
search_tbl->is_SGI = 0;
|
|
search_tbl->is_fat = 0;
|
|
ret = rs_switch_to_siso(priv, lq_data, search_tbl,
|
|
index);
|
|
if (!ret) {
|
|
lq_data->search_better_tbl = 1;
|
|
lq_data->action_counter = 0;
|
|
goto out;
|
|
}
|
|
|
|
break;
|
|
case IWL_LEGACY_SWITCH_MIMO:
|
|
IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
|
|
|
|
/* Set up search table to try MIMO */
|
|
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;
|
|
ret = rs_switch_to_mimo(priv, lq_data, search_tbl,
|
|
index);
|
|
if (!ret) {
|
|
lq_data->search_better_tbl = 1;
|
|
lq_data->action_counter = 0;
|
|
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;
|
|
|
|
}
|
|
|
|
/*
|
|
* Try to switch to new modulation mode from SISO
|
|
*/
|
|
static int rs_move_siso_to_other(struct iwl4965_priv *priv,
|
|
struct iwl4965_rate_scale_priv *lq_data,
|
|
int index)
|
|
{
|
|
int ret;
|
|
u8 is_green = lq_data->is_green;
|
|
struct iwl4965_scale_tbl_info *tbl =
|
|
&(lq_data->lq_info[lq_data->active_tbl]);
|
|
struct iwl4965_scale_tbl_info *search_tbl =
|
|
&(lq_data->lq_info[(1 - lq_data->active_tbl)]);
|
|
struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
|
|
u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
|
|
(sizeof(struct iwl4965_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;
|
|
ret = rs_switch_to_mimo(priv, lq_data, search_tbl,
|
|
index);
|
|
if (!ret) {
|
|
lq_data->search_better_tbl = 1;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Try to switch to new modulation mode from MIMO
|
|
*/
|
|
static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
|
|
struct iwl4965_rate_scale_priv *lq_data,
|
|
int index)
|
|
{
|
|
int ret;
|
|
s8 is_green = lq_data->is_green;
|
|
struct iwl4965_scale_tbl_info *tbl =
|
|
&(lq_data->lq_info[lq_data->active_tbl]);
|
|
struct iwl4965_scale_tbl_info *search_tbl =
|
|
&(lq_data->lq_info[(1 - lq_data->active_tbl)]);
|
|
u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
|
|
(sizeof(struct iwl4965_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");
|
|
|
|
/* Set up new search table for SISO */
|
|
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;
|
|
|
|
ret = rs_switch_to_siso(priv, lq_data, search_tbl,
|
|
index);
|
|
if (!ret) {
|
|
lq_data->search_better_tbl = 1;
|
|
goto out;
|
|
}
|
|
break;
|
|
|
|
case IWL_MIMO_SWITCH_GI:
|
|
IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
|
|
|
|
/* Set up new search table for MIMO */
|
|
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 active table already uses the fastest possible
|
|
* modulation (dual stream with short guard interval),
|
|
* and it's working well, there's no need to look
|
|
* for a better type of modulation!
|
|
*/
|
|
if ((tbl->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;
|
|
|
|
}
|
|
|
|
/*
|
|
* Check whether we should continue using same modulation mode, or
|
|
* begin search for a new mode, based on:
|
|
* 1) # tx successes or failures while using this mode
|
|
* 2) # times calling this function
|
|
* 3) elapsed time in this mode (not used, for now)
|
|
*/
|
|
static void rs_stay_in_table(struct iwl4965_rate_scale_priv *lq_data)
|
|
{
|
|
struct iwl4965_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 we've been disallowing search, see if we should now allow it */
|
|
if (lq_data->stay_in_tbl) {
|
|
|
|
/* Elapsed time using current modulation mode */
|
|
if (lq_data->flush_timer)
|
|
flush_interval_passed =
|
|
time_after(jiffies,
|
|
(unsigned long)(lq_data->flush_timer +
|
|
IWL_RATE_SCALE_FLUSH_INTVL));
|
|
|
|
/* For now, disable the elapsed time criterion */
|
|
flush_interval_passed = 0;
|
|
|
|
/*
|
|
* Check if we should allow search for new modulation mode.
|
|
* If many frames have failed or succeeded, or we've used
|
|
* this same modulation for a long time, allow search, and
|
|
* reset history stats that keep track of whether we should
|
|
* allow a new search. Also (below) reset all bitmaps and
|
|
* stats in active history.
|
|
*/
|
|
if ((lq_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);
|
|
|
|
/* Allow search for new mode */
|
|
lq_data->stay_in_tbl = 0; /* only place reset */
|
|
lq_data->total_failed = 0;
|
|
lq_data->total_success = 0;
|
|
lq_data->flush_timer = 0;
|
|
|
|
/*
|
|
* Else if we've used this modulation mode enough repetitions
|
|
* (regardless of elapsed time or success/failure), reset
|
|
* history bitmaps and rate-specific stats for all rates in
|
|
* active table.
|
|
*/
|
|
} else {
|
|
lq_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 transitioning to allow "search", reset all history
|
|
* bitmaps and stats in active table (this will become the new
|
|
* "search" table). */
|
|
if (!lq_data->stay_in_tbl) {
|
|
for (i = 0; i < IWL_RATE_COUNT; i++)
|
|
rs_rate_scale_clear_window(&(tbl->win[i]));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Do rate scaling and search for new modulation mode.
|
|
*/
|
|
static void rs_rate_scale_perform(struct iwl4965_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 iwl4965_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 iwl4965_rate_scale_priv *lq_data;
|
|
struct iwl4965_scale_tbl_info *tbl, *tbl1;
|
|
u16 rate_scale_index_msk = 0;
|
|
struct iwl4965_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 iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
|
|
|
|
/*
|
|
* Select rate-scale / modulation-mode table to work with in
|
|
* the rest of this function: "search" if searching for better
|
|
* modulation mode, or "active" if doing rate scaling within a mode.
|
|
*/
|
|
if (!lq_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;
|
|
|
|
/* current tx rate */
|
|
index = sta->last_txrate;
|
|
|
|
IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
|
|
tbl->lq_type);
|
|
|
|
/* rates available for this association, and for modulation mode */
|
|
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)
|
|
/* supp_rates has no CCK bits in A mode */
|
|
rate_scale_index_msk = (u16) (rate_mask &
|
|
(lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
|
|
else
|
|
rate_scale_index_msk = (u16) (rate_mask &
|
|
lq_data->supp_rates);
|
|
|
|
} else
|
|
rate_scale_index_msk = rate_mask;
|
|
|
|
if (!rate_scale_index_msk)
|
|
rate_scale_index_msk = rate_mask;
|
|
|
|
/* If current rate is no longer supported on current association,
|
|
* or user changed preferences for rates, find a new supported rate. */
|
|
if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
|
|
index = IWL_INVALID_VALUE;
|
|
update_lq = 1;
|
|
|
|
/* get the highest available 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;
|
|
}
|
|
}
|
|
|
|
/* Get expected throughput table and history window for current rate */
|
|
if (!tbl->expected_tpt)
|
|
rs_get_expected_tpt_table(lq_data, tbl);
|
|
|
|
window = &(tbl->win[index]);
|
|
|
|
/*
|
|
* If there is not enough history to calculate actual average
|
|
* throughput, keep analyzing results of more tx frames, without
|
|
* changing rate or mode (bypass most of the rest of this function).
|
|
* Set up new rate table in uCode only if old rate is not supported
|
|
* in current association (use new rate found above).
|
|
*/
|
|
fail_count = window->counter - window->success_counter;
|
|
if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
|
|
(window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
|
|
|| (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);
|
|
|
|
/* Can't calculate this yet; not enough history */
|
|
window->average_tpt = IWL_INVALID_VALUE;
|
|
|
|
/* Should we stay with this modulation mode,
|
|
* or search for a new one? */
|
|
rs_stay_in_table(lq_data);
|
|
|
|
/* Set up new rate table in uCode, if needed */
|
|
if (update_lq) {
|
|
rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
|
|
rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
|
|
rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
|
|
}
|
|
goto out;
|
|
|
|
/* Else we have enough samples; calculate estimate of
|
|
* actual average throughput */
|
|
} else
|
|
window->average_tpt = ((window->success_ratio *
|
|
tbl->expected_tpt[index] + 64) / 128);
|
|
|
|
/* If we are searching for better modulation mode, check success. */
|
|
if (lq_data->search_better_tbl) {
|
|
int success_limit = IWL_RATE_SCALE_SWITCH;
|
|
|
|
/* If good success, continue using the "search" mode;
|
|
* no need to send new link quality command, since we're
|
|
* continuing to use the setup that we've been trying. */
|
|
if ((window->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;
|
|
}
|
|
/* Swap tables; "search" becomes "active" */
|
|
lq_data->active_tbl = active_tbl;
|
|
current_tpt = window->average_tpt;
|
|
|
|
/* Else poor success; go back to mode in "active" table */
|
|
} else {
|
|
/* Nullify "search" table */
|
|
tbl->lq_type = LQ_NONE;
|
|
|
|
/* Revert to "active" table */
|
|
active_tbl = lq_data->active_tbl;
|
|
tbl = &(lq_data->lq_info[active_tbl]);
|
|
|
|
/* Revert to "active" rate and throughput info */
|
|
index = iwl4965_rate_index_from_plcp(
|
|
tbl->current_rate.rate_n_flags);
|
|
current_tpt = lq_data->last_tpt;
|
|
|
|
/* Need to set up a new rate table in uCode */
|
|
update_lq = 1;
|
|
IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
|
|
}
|
|
|
|
/* Either way, we've made a decision; modulation mode
|
|
* search is done, allow rate adjustment next time. */
|
|
lq_data->search_better_tbl = 0;
|
|
done_search = 1; /* Don't switch modes below! */
|
|
goto lq_update;
|
|
}
|
|
|
|
/* (Else) not in search of better modulation mode, try for better
|
|
* starting rate, while staying in this mode. */
|
|
high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
|
|
tbl->lq_type);
|
|
low = high_low & 0xff;
|
|
high = (high_low >> 8) & 0xff;
|
|
|
|
/* Collect measured throughputs for current and adjacent rates */
|
|
current_tpt = window->average_tpt;
|
|
if (low != IWL_RATE_INVALID)
|
|
low_tpt = tbl->win[low].average_tpt;
|
|
if (high != IWL_RATE_INVALID)
|
|
high_tpt = tbl->win[high].average_tpt;
|
|
|
|
/* Assume rate increase */
|
|
scale_action = 1;
|
|
|
|
/* Too many failures, decrease rate */
|
|
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;
|
|
|
|
/* No throughput measured yet for adjacent rates; try increase. */
|
|
} else if ((low_tpt == IWL_INVALID_VALUE) &&
|
|
(high_tpt == IWL_INVALID_VALUE))
|
|
scale_action = 1;
|
|
|
|
/* Both adjacent throughputs are measured, but neither one has better
|
|
* throughput; we're using the best rate, don't change it! */
|
|
else if ((low_tpt != IWL_INVALID_VALUE) &&
|
|
(high_tpt != IWL_INVALID_VALUE) &&
|
|
(low_tpt < current_tpt) &&
|
|
(high_tpt < current_tpt))
|
|
scale_action = 0;
|
|
|
|
/* At least one adjacent rate's throughput is measured,
|
|
* and may have better performance. */
|
|
else {
|
|
/* Higher adjacent rate's throughput is measured */
|
|
if (high_tpt != IWL_INVALID_VALUE) {
|
|
/* Higher rate has better throughput */
|
|
if (high_tpt > current_tpt)
|
|
scale_action = 1;
|
|
else {
|
|
IWL_DEBUG_RATE
|
|
("decrease rate because of high tpt\n");
|
|
scale_action = -1;
|
|
}
|
|
|
|
/* Lower adjacent rate's throughput is measured */
|
|
} else if (low_tpt != IWL_INVALID_VALUE) {
|
|
/* Lower rate has better throughput */
|
|
if (low_tpt > current_tpt) {
|
|
IWL_DEBUG_RATE
|
|
("decrease rate because of low tpt\n");
|
|
scale_action = -1;
|
|
} else
|
|
scale_action = 1;
|
|
}
|
|
}
|
|
|
|
/* Sanity check; asked for decrease, but success rate or throughput
|
|
* has been good at old rate. Don't change it. */
|
|
if (scale_action == -1) {
|
|
if ((low != IWL_RATE_INVALID) &&
|
|
((window->success_ratio > IWL_RATE_HIGH_TH) ||
|
|
(current_tpt > (100 * tbl->expected_tpt[low]))))
|
|
scale_action = 0;
|
|
|
|
/* Sanity check; asked for increase, but success rate has not been great
|
|
* even at old rate, higher rate will be worse. Don't change it. */
|
|
} else if ((scale_action == 1) &&
|
|
(window->success_ratio < IWL_RATE_INCREASE_TH))
|
|
scale_action = 0;
|
|
|
|
switch (scale_action) {
|
|
case -1:
|
|
/* Decrease starting rate, update uCode's rate table */
|
|
if (low != IWL_RATE_INVALID) {
|
|
update_lq = 1;
|
|
index = low;
|
|
}
|
|
break;
|
|
case 1:
|
|
/* Increase starting rate, update uCode's rate table */
|
|
if (high != IWL_RATE_INVALID) {
|
|
update_lq = 1;
|
|
index = high;
|
|
}
|
|
|
|
break;
|
|
case 0:
|
|
/* No change */
|
|
default:
|
|
break;
|
|
}
|
|
|
|
IWL_DEBUG_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:
|
|
/* Replace uCode's rate table for the destination station. */
|
|
if (update_lq) {
|
|
rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
|
|
rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
|
|
rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
|
|
}
|
|
|
|
/* Should we stay with this modulation mode, or search for a new one? */
|
|
rs_stay_in_table(lq_data);
|
|
|
|
/*
|
|
* Search for new modulation mode if we're:
|
|
* 1) Not changing rates right now
|
|
* 2) Not just finishing up a search
|
|
* 3) Allowing a new search
|
|
*/
|
|
if (!update_lq && !done_search && !lq_data->stay_in_tbl) {
|
|
/* Save current throughput to compare with "search" throughput*/
|
|
lq_data->last_tpt = current_tpt;
|
|
|
|
/* Select a new "search" modulation mode to try.
|
|
* If one is found, set up the new "search" table. */
|
|
if (is_legacy(tbl->lq_type))
|
|
rs_move_legacy_other(priv, lq_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 new "search" mode was selected, set up in uCode table */
|
|
if (lq_data->search_better_tbl) {
|
|
/* Access the "search" table, clear its history. */
|
|
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]));
|
|
|
|
/* Use new "search" start rate */
|
|
index = iwl4965_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);
|
|
rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
|
|
}
|
|
|
|
/* If the "active" (non-search) mode was legacy,
|
|
* and we've tried switching antennas,
|
|
* but we haven't been able to try HT modes (not available),
|
|
* stay with best antenna legacy modulation for a while
|
|
* before next round of mode comparisons. */
|
|
tbl1 = &(lq_data->lq_info[lq_data->active_tbl]);
|
|
if (is_legacy(tbl1->lq_type) &&
|
|
#ifdef CONFIG_IWL4965_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 we're in an HT mode, and all 3 mode switch actions
|
|
* have been tried and compared, stay in this best modulation
|
|
* mode for a while before next round of mode comparisons. */
|
|
if (lq_data->enable_counter &&
|
|
(lq_data->action_counter >= IWL_ACTION_LIMIT)) {
|
|
#ifdef CONFIG_IWL4965_HT_AGG
|
|
/* If appropriate, set up aggregation! */
|
|
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_IWL4965_HT_AGG */
|
|
lq_data->action_counter = 0;
|
|
rs_set_stay_in_table(0, lq_data);
|
|
}
|
|
|
|
/*
|
|
* Else, don't search for a new modulation mode.
|
|
* Put new timestamp in stay-in-modulation-mode flush timer if:
|
|
* 1) Not changing rates right now
|
|
* 2) Not just finishing up a search
|
|
* 3) flush timer is empty
|
|
*/
|
|
} 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 iwl4965_priv *priv,
|
|
struct sta_info *sta)
|
|
{
|
|
int i;
|
|
struct iwl4965_rate_scale_priv *lq;
|
|
struct iwl4965_scale_tbl_info *tbl;
|
|
u8 active_tbl = 0;
|
|
int rate_idx;
|
|
u8 use_green = rs_use_green(priv);
|
|
struct iwl4965_rate mcs_rate;
|
|
|
|
if (!sta || !sta->rate_ctrl_priv)
|
|
goto out;
|
|
|
|
lq = (struct iwl4965_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 = iwl4965_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);
|
|
rs_send_lq_cmd(priv, &lq->lq, CMD_ASYNC);
|
|
out:
|
|
return;
|
|
}
|
|
|
|
static void rs_get_rate(void *priv_rate, struct net_device *dev,
|
|
struct ieee80211_hw_mode *mode, struct sk_buff *skb,
|
|
struct rate_selection *sel)
|
|
{
|
|
|
|
int i;
|
|
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
|
|
struct sta_info *sta;
|
|
struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
|
|
struct iwl4965_rate_scale_priv *lq;
|
|
|
|
IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
|
|
|
|
sta = sta_info_get(local, hdr->addr1);
|
|
|
|
if (!sta || !sta->rate_ctrl_priv) {
|
|
sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
|
|
if (sta)
|
|
sta_info_put(sta);
|
|
return;
|
|
}
|
|
|
|
lq = (struct iwl4965_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 = iwl4965_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 = iwl4965_add_station_flags(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:
|
|
if ((i < 0) || (i > IWL_RATE_COUNT)) {
|
|
sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
|
|
return;
|
|
}
|
|
sta_info_put(sta);
|
|
|
|
sel->rate = &priv->ieee_rates[i];
|
|
}
|
|
|
|
static void *rs_alloc_sta(void *priv, gfp_t gfp)
|
|
{
|
|
struct iwl4965_rate_scale_priv *crl;
|
|
int i, j;
|
|
|
|
IWL_DEBUG_RATE("create station rate scale window\n");
|
|
|
|
crl = kzalloc(sizeof(struct iwl4965_rate_scale_priv), gfp);
|
|
|
|
if (crl == NULL)
|
|
return NULL;
|
|
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 iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
|
|
struct iwl4965_rate_scale_priv *crl = priv_sta;
|
|
|
|
crl->flush_timer = 0;
|
|
crl->supp_rates = sta->supp_rates;
|
|
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 = iwl4965_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 = iwl4965_add_station_flags(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;
|
|
}
|
|
|
|
/* Find highest tx rate supported by hardware and destination station */
|
|
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, cck rates are at end of 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_IWL4965_HT
|
|
/*
|
|
* active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
|
|
* supp_rates[] does not; shift to convert format, force 9 MBits off.
|
|
*/
|
|
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;
|
|
|
|
/* Same here */
|
|
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_IWL4965_HT*/
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
crl->drv = priv;
|
|
#endif
|
|
|
|
if (priv->assoc_station_added)
|
|
priv->lq_mngr.lq_ready = 1;
|
|
|
|
rs_initialize_lq(priv, sta);
|
|
}
|
|
|
|
static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data,
|
|
struct iwl4965_rate *tx_mcs,
|
|
struct iwl4965_link_quality_cmd *lq_cmd)
|
|
{
|
|
int index = 0;
|
|
int rate_idx;
|
|
int repeat_rate = 0;
|
|
u8 ant_toggle_count = 0;
|
|
u8 use_ht_possible = 1;
|
|
struct iwl4965_rate new_rate;
|
|
struct iwl4965_scale_tbl_info tbl_type = { 0 };
|
|
|
|
/* Override starting rate (index 0) if needed for debug purposes */
|
|
rs_dbgfs_set_mcs(lq_data, tx_mcs, index);
|
|
|
|
/* Interpret rate_n_flags */
|
|
rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode,
|
|
&tbl_type, &rate_idx);
|
|
|
|
/* How many times should we repeat the initial rate? */
|
|
if (is_legacy(tbl_type.lq_type)) {
|
|
ant_toggle_count = 1;
|
|
repeat_rate = IWL_NUMBER_TRY;
|
|
} else
|
|
repeat_rate = IWL_HT_NUMBER_TRY;
|
|
|
|
lq_cmd->general_params.mimo_delimiter =
|
|
is_mimo(tbl_type.lq_type) ? 1 : 0;
|
|
|
|
/* Fill 1st table entry (index 0) */
|
|
lq_cmd->rs_table[index].rate_n_flags =
|
|
cpu_to_le32(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
|
|
= LINK_QUAL_ANT_A_MSK;
|
|
else
|
|
lq_cmd->general_params.single_stream_ant_msk
|
|
= LINK_QUAL_ANT_B_MSK;
|
|
|
|
index++;
|
|
repeat_rate--;
|
|
|
|
/* Fill rest of rate table */
|
|
while (index < LINK_QUAL_MAX_RETRY_NUM) {
|
|
/* Repeat initial/next rate.
|
|
* For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
|
|
* For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
|
|
while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
|
|
if (is_legacy(tbl_type.lq_type)) {
|
|
if (ant_toggle_count <
|
|
NUM_TRY_BEFORE_ANTENNA_TOGGLE)
|
|
ant_toggle_count++;
|
|
else {
|
|
rs_toggle_antenna(&new_rate, &tbl_type);
|
|
ant_toggle_count = 1;
|
|
}
|
|
}
|
|
|
|
/* Override next rate if needed for debug purposes */
|
|
rs_dbgfs_set_mcs(lq_data, &new_rate, index);
|
|
|
|
/* Fill next table entry */
|
|
lq_cmd->rs_table[index].rate_n_flags =
|
|
cpu_to_le32(new_rate.rate_n_flags);
|
|
repeat_rate--;
|
|
index++;
|
|
}
|
|
|
|
rs_get_tbl_info_from_mcs(&new_rate, lq_data->phymode, &tbl_type,
|
|
&rate_idx);
|
|
|
|
/* Indicate to uCode which entries might be MIMO.
|
|
* If initial rate was MIMO, this will finally end up
|
|
* as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
|
|
if (is_mimo(tbl_type.lq_type))
|
|
lq_cmd->general_params.mimo_delimiter = index;
|
|
|
|
/* Get next rate */
|
|
rs_get_lower_rate(lq_data, &tbl_type, rate_idx,
|
|
use_ht_possible, &new_rate);
|
|
|
|
/* How many times should we repeat the next rate? */
|
|
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_rate = IWL_NUMBER_TRY;
|
|
} else
|
|
repeat_rate = IWL_HT_NUMBER_TRY;
|
|
|
|
/* Don't allow HT rates after next pass.
|
|
* rs_get_lower_rate() will change type to LQ_A or LQ_G. */
|
|
use_ht_possible = 0;
|
|
|
|
/* Override next rate if needed for debug purposes */
|
|
rs_dbgfs_set_mcs(lq_data, &new_rate, index);
|
|
|
|
/* Fill next table entry */
|
|
lq_cmd->rs_table[index].rate_n_flags =
|
|
cpu_to_le32(new_rate.rate_n_flags);
|
|
|
|
index++;
|
|
repeat_rate--;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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 iwl4965_priv *priv = (struct iwl4965_priv *) priv_rate;
|
|
|
|
IWL_DEBUG_RATE("enter\n");
|
|
|
|
priv->lq_mngr.lq_ready = 0;
|
|
#ifdef CONFIG_IWL4965_HT
|
|
#ifdef CONFIG_IWL4965_HT_AGG
|
|
if (priv->lq_mngr.agg_ctrl.granted_ba)
|
|
iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
|
|
#endif /*CONFIG_IWL4965_HT_AGG */
|
|
#endif /* CONFIG_IWL4965_HT */
|
|
|
|
IWL_DEBUG_RATE("leave\n");
|
|
}
|
|
|
|
static void rs_free_sta(void *priv, void *priv_sta)
|
|
{
|
|
struct iwl4965_rate_scale_priv *rs_priv = priv_sta;
|
|
|
|
IWL_DEBUG_RATE("enter\n");
|
|
kfree(rs_priv);
|
|
IWL_DEBUG_RATE("leave\n");
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
static int open_file_generic(struct inode *inode, struct file *file)
|
|
{
|
|
file->private_data = inode->i_private;
|
|
return 0;
|
|
}
|
|
static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv,
|
|
struct iwl4965_rate *mcs, int index)
|
|
{
|
|
u32 base_rate;
|
|
|
|
if (rs_priv->phymode == (u8) MODE_IEEE80211A)
|
|
base_rate = 0x800D;
|
|
else
|
|
base_rate = 0x820A;
|
|
|
|
if (rs_priv->dbg_fixed.rate_n_flags) {
|
|
if (index < 12)
|
|
mcs->rate_n_flags = rs_priv->dbg_fixed.rate_n_flags;
|
|
else
|
|
mcs->rate_n_flags = base_rate;
|
|
IWL_DEBUG_RATE("Fixed rate ON\n");
|
|
return;
|
|
}
|
|
|
|
IWL_DEBUG_RATE("Fixed rate OFF\n");
|
|
}
|
|
|
|
static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
|
|
const char __user *user_buf, size_t count, loff_t *ppos)
|
|
{
|
|
struct iwl4965_rate_scale_priv *rs_priv = file->private_data;
|
|
char buf[64];
|
|
int buf_size;
|
|
u32 parsed_rate;
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
buf_size = min(count, sizeof(buf) - 1);
|
|
if (copy_from_user(buf, user_buf, buf_size))
|
|
return -EFAULT;
|
|
|
|
if (sscanf(buf, "%x", &parsed_rate) == 1)
|
|
rs_priv->dbg_fixed.rate_n_flags = parsed_rate;
|
|
else
|
|
rs_priv->dbg_fixed.rate_n_flags = 0;
|
|
|
|
rs_priv->active_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
|
|
rs_priv->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
|
|
rs_priv->active_mimo_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
|
|
|
|
IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
|
|
rs_priv->lq.sta_id, rs_priv->dbg_fixed.rate_n_flags);
|
|
|
|
if (rs_priv->dbg_fixed.rate_n_flags) {
|
|
rs_fill_link_cmd(rs_priv, &rs_priv->dbg_fixed, &rs_priv->lq);
|
|
rs_send_lq_cmd(rs_priv->drv, &rs_priv->lq, CMD_ASYNC);
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
|
|
char __user *user_buf, size_t count, loff_t *ppos)
|
|
{
|
|
char buff[1024];
|
|
int desc = 0;
|
|
int i = 0;
|
|
|
|
struct iwl4965_rate_scale_priv *rs_priv = file->private_data;
|
|
|
|
desc += sprintf(buff+desc, "sta_id %d\n", rs_priv->lq.sta_id);
|
|
desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
|
|
rs_priv->total_failed, rs_priv->total_success,
|
|
rs_priv->active_rate);
|
|
desc += sprintf(buff+desc, "fixed rate 0x%X\n",
|
|
rs_priv->dbg_fixed.rate_n_flags);
|
|
desc += sprintf(buff+desc, "general:"
|
|
"flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
|
|
rs_priv->lq.general_params.flags,
|
|
rs_priv->lq.general_params.mimo_delimiter,
|
|
rs_priv->lq.general_params.single_stream_ant_msk,
|
|
rs_priv->lq.general_params.dual_stream_ant_msk);
|
|
|
|
desc += sprintf(buff+desc, "agg:"
|
|
"time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
|
|
le16_to_cpu(rs_priv->lq.agg_params.agg_time_limit),
|
|
rs_priv->lq.agg_params.agg_dis_start_th,
|
|
rs_priv->lq.agg_params.agg_frame_cnt_limit);
|
|
|
|
desc += sprintf(buff+desc,
|
|
"Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
|
|
rs_priv->lq.general_params.start_rate_index[0],
|
|
rs_priv->lq.general_params.start_rate_index[1],
|
|
rs_priv->lq.general_params.start_rate_index[2],
|
|
rs_priv->lq.general_params.start_rate_index[3]);
|
|
|
|
|
|
for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
|
|
desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
|
|
i, le32_to_cpu(rs_priv->lq.rs_table[i].rate_n_flags));
|
|
|
|
return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
|
|
}
|
|
|
|
static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
|
|
.write = rs_sta_dbgfs_scale_table_write,
|
|
.read = rs_sta_dbgfs_scale_table_read,
|
|
.open = open_file_generic,
|
|
};
|
|
static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
|
|
char __user *user_buf, size_t count, loff_t *ppos)
|
|
{
|
|
char buff[1024];
|
|
int desc = 0;
|
|
int i, j;
|
|
|
|
struct iwl4965_rate_scale_priv *rs_priv = file->private_data;
|
|
for (i = 0; i < LQ_SIZE; i++) {
|
|
desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
|
|
"rate=0x%X\n",
|
|
rs_priv->active_tbl == i?"*":"x",
|
|
rs_priv->lq_info[i].lq_type,
|
|
rs_priv->lq_info[i].is_SGI,
|
|
rs_priv->lq_info[i].is_fat,
|
|
rs_priv->lq_info[i].is_dup,
|
|
rs_priv->lq_info[i].current_rate.rate_n_flags);
|
|
for (j = 0; j < IWL_RATE_COUNT; j++) {
|
|
desc += sprintf(buff+desc,
|
|
"counter=%d success=%d %%=%d\n",
|
|
rs_priv->lq_info[i].win[j].counter,
|
|
rs_priv->lq_info[i].win[j].success_counter,
|
|
rs_priv->lq_info[i].win[j].success_ratio);
|
|
}
|
|
}
|
|
return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
|
|
}
|
|
|
|
static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
|
|
.read = rs_sta_dbgfs_stats_table_read,
|
|
.open = open_file_generic,
|
|
};
|
|
|
|
static void rs_add_debugfs(void *priv, void *priv_sta,
|
|
struct dentry *dir)
|
|
{
|
|
struct iwl4965_rate_scale_priv *rs_priv = priv_sta;
|
|
rs_priv->rs_sta_dbgfs_scale_table_file =
|
|
debugfs_create_file("rate_scale_table", 0600, dir,
|
|
rs_priv, &rs_sta_dbgfs_scale_table_ops);
|
|
rs_priv->rs_sta_dbgfs_stats_table_file =
|
|
debugfs_create_file("rate_stats_table", 0600, dir,
|
|
rs_priv, &rs_sta_dbgfs_stats_table_ops);
|
|
}
|
|
|
|
static void rs_remove_debugfs(void *priv, void *priv_sta)
|
|
{
|
|
struct iwl4965_rate_scale_priv *rs_priv = priv_sta;
|
|
debugfs_remove(rs_priv->rs_sta_dbgfs_scale_table_file);
|
|
debugfs_remove(rs_priv->rs_sta_dbgfs_stats_table_file);
|
|
}
|
|
#endif
|
|
|
|
static struct rate_control_ops rs_ops = {
|
|
.module = NULL,
|
|
.name = RS_NAME,
|
|
.tx_status = rs_tx_status,
|
|
.get_rate = rs_get_rate,
|
|
.rate_init = rs_rate_init,
|
|
.clear = rs_clear,
|
|
.alloc = rs_alloc,
|
|
.free = rs_free,
|
|
.alloc_sta = rs_alloc_sta,
|
|
.free_sta = rs_free_sta,
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
.add_sta_debugfs = rs_add_debugfs,
|
|
.remove_sta_debugfs = rs_remove_debugfs,
|
|
#endif
|
|
};
|
|
|
|
int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct iwl4965_priv *priv = hw->priv;
|
|
struct iwl4965_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: ", iwl4965_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 *
|
|
iwl4965_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 = iwl4965_get_prev_ieee_rate(i);
|
|
if (j == i)
|
|
break;
|
|
i = j;
|
|
}
|
|
|
|
/* Display the average rate of all samples taken.
|
|
*
|
|
* NOTE: We multiply # of samples by 2 since the IEEE measurement
|
|
* added from iwl4965_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 antenna %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 iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
|
|
{
|
|
struct iwl4965_priv *priv = hw->priv;
|
|
|
|
priv->lq_mngr.lq_ready = 1;
|
|
}
|
|
|
|
void iwl4965_rate_control_register(struct ieee80211_hw *hw)
|
|
{
|
|
ieee80211_rate_control_register(&rs_ops);
|
|
}
|
|
|
|
void iwl4965_rate_control_unregister(struct ieee80211_hw *hw)
|
|
{
|
|
ieee80211_rate_control_unregister(&rs_ops);
|
|
}
|
|
|