diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-agn-rs.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-agn-rs.c | 2614 |
1 files changed, 2614 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c new file mode 100644 index 00000000000..754fef5b592 --- /dev/null +++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c @@ -0,0 +1,2614 @@ +/****************************************************************************** + * + * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA + * + * The full GNU General Public License is included in this distribution in the + * file called LICENSE. + * + * Contact Information: + * James P. Ketrenos <ipw2100-admin@linux.intel.com> + * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 + * + *****************************************************************************/ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/skbuff.h> +#include <linux/wireless.h> +#include <net/mac80211.h> + +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/delay.h> + +#include <linux/workqueue.h> + +#include "../net/mac80211/rate.h" + +#include "iwl-dev.h" +#include "iwl-sta.h" +#include "iwl-core.h" +#include "iwl-helpers.h" + +#define RS_NAME "iwl-agn-rs" + +#define NUM_TRY_BEFORE_ANT_TOGGLE 1 +#define IWL_NUMBER_TRY 1 +#define IWL_HT_NUMBER_TRY 3 + +#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ +#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */ +#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */ + +/* max time to accum history 2 seconds */ +#define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ) + +static u8 rs_ht_to_legacy[] = { + IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, + IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, + IWL_RATE_6M_INDEX, + IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX, + IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX, + IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX, + IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX +}; + +static const u8 ant_toggle_lookup[] = { + /*ANT_NONE -> */ ANT_NONE, + /*ANT_A -> */ ANT_B, + /*ANT_B -> */ ANT_C, + /*ANT_AB -> */ ANT_BC, + /*ANT_C -> */ ANT_A, + /*ANT_AC -> */ ANT_AB, + /*ANT_BC -> */ ANT_AC, + /*ANT_ABC -> */ ANT_ABC, +}; + +/** + * struct iwl_rate_scale_data -- tx success history for one rate + */ +struct iwl_rate_scale_data { + u64 data; /* bitmap of successful frames */ + s32 success_counter; /* number of frames successful */ + s32 success_ratio; /* per-cent * 128 */ + s32 counter; /* number of frames attempted */ + s32 average_tpt; /* success ratio * expected throughput */ + unsigned long stamp; +}; + +/** + * struct iwl_scale_tbl_info -- tx params and success history for all rates + * + * There are two of these in struct iwl_lq_sta, + * one for "active", and one for "search". + */ +struct iwl_scale_tbl_info { + enum iwl_table_type lq_type; + u8 ant_type; + u8 is_SGI; /* 1 = short guard interval */ + u8 is_fat; /* 1 = 40 MHz channel width */ + u8 is_dup; /* 1 = duplicated data streams */ + u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */ + s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */ + u32 current_rate; /* rate_n_flags, uCode API format */ + struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */ +}; + +struct iwl_traffic_load { + unsigned long time_stamp; /* age of the oldest statistics */ + u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time + * slice */ + u32 total; /* total num of packets during the + * last TID_MAX_TIME_DIFF */ + u8 queue_count; /* number of queues that has + * been used since the last cleanup */ + u8 head; /* start of the circular buffer */ +}; + +/** + * struct iwl_lq_sta -- driver's rate scaling private structure + * + * Pointer to this gets passed back and forth between driver and mac80211. + */ +struct iwl_lq_sta { + u8 active_tbl; /* index of active table, range 0-1 */ + u8 enable_counter; /* indicates HT mode */ + u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */ + u8 search_better_tbl; /* 1: currently trying alternate mode */ + s32 last_tpt; + + /* The following determine when to search for a new mode */ + u32 table_count_limit; + u32 max_failure_limit; /* # failed frames before new search */ + u32 max_success_limit; /* # successful frames before new search */ + u32 table_count; + u32 total_failed; /* total failed frames, any/all rates */ + u32 total_success; /* total successful frames, any/all rates */ + u32 flush_timer; /* time staying in mode before new search */ + + u8 action_counter; /* # mode-switch actions tried */ + u8 is_green; + u8 is_dup; + enum ieee80211_band band; + u8 ibss_sta_added; + + /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */ + u32 supp_rates; + u16 active_legacy_rate; + u16 active_siso_rate; + u16 active_mimo2_rate; + u16 active_mimo3_rate; + u16 active_rate_basic; + + struct iwl_link_quality_cmd lq; + struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */ + struct iwl_traffic_load load[TID_MAX_LOAD_COUNT]; + u8 tx_agg_tid_en; +#ifdef CONFIG_MAC80211_DEBUGFS + struct dentry *rs_sta_dbgfs_scale_table_file; + struct dentry *rs_sta_dbgfs_stats_table_file; + struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file; + u32 dbg_fixed_rate; +#endif + struct iwl_priv *drv; +}; + +static void rs_rate_scale_perform(struct iwl_priv *priv, + struct net_device *dev, + struct ieee80211_hdr *hdr, + struct sta_info *sta); +static void rs_fill_link_cmd(const struct iwl_priv *priv, + struct iwl_lq_sta *lq_sta, u32 rate_n_flags); + + +#ifdef CONFIG_MAC80211_DEBUGFS +static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, + u32 *rate_n_flags, int index); +#else +static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, + u32 *rate_n_flags, int index) +{} +#endif + +/* + * Expected throughput metrics for following rates: + * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits + * "G" is the only table that supports CCK (the first 4 rates). + */ +/*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/ +static s32 expected_tpt_A[IWL_RATE_COUNT] = { + 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186 +}; + +static s32 expected_tpt_G[IWL_RATE_COUNT] = { + 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186 +}; + +static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = { + 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202 +}; + +static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = { + 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211 +}; + +static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = { + 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251 +}; + +static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = { + 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257 +}; + +static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = { + 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257 +}; + +static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = { + 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264 +}; + +static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = { + 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289 +}; + +static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = { + 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293 +}; + +static inline u8 rs_extract_rate(u32 rate_n_flags) +{ + return (u8)(rate_n_flags & 0xFF); +} + +static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) +{ + window->data = 0; + window->success_counter = 0; + window->success_ratio = IWL_INVALID_VALUE; + window->counter = 0; + window->average_tpt = IWL_INVALID_VALUE; + window->stamp = 0; +} + +static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) +{ + return (ant_type & valid_antenna) == ant_type; +} + +/* + * removes the old data from the statistics. All data that is older than + * TID_MAX_TIME_DIFF, will be deleted. + */ +static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time) +{ + /* The oldest age we want to keep */ + u32 oldest_time = curr_time - TID_MAX_TIME_DIFF; + + while (tl->queue_count && + (tl->time_stamp < oldest_time)) { + tl->total -= tl->packet_count[tl->head]; + tl->packet_count[tl->head] = 0; + tl->time_stamp += TID_QUEUE_CELL_SPACING; + tl->queue_count--; + tl->head++; + if (tl->head >= TID_QUEUE_MAX_SIZE) + tl->head = 0; + } +} + +/* + * increment traffic load value for tid and also remove + * any old values if passed the certain time period + */ +static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data, + struct ieee80211_hdr *hdr) +{ + u32 curr_time = jiffies_to_msecs(jiffies); + u32 time_diff; + s32 index; + struct iwl_traffic_load *tl = NULL; + __le16 fc = hdr->frame_control; + u8 tid; + + if (ieee80211_is_data_qos(fc)) { + u8 *qc = ieee80211_get_qos_ctl(hdr); + tid = qc[0] & 0xf; + } else + return MAX_TID_COUNT; + + tl = &lq_data->load[tid]; + + curr_time -= curr_time % TID_ROUND_VALUE; + + /* Happens only for the first packet. Initialize the data */ + if (!(tl->queue_count)) { + tl->total = 1; + tl->time_stamp = curr_time; + tl->queue_count = 1; + tl->head = 0; + tl->packet_count[0] = 1; + return MAX_TID_COUNT; + } + + time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); + index = time_diff / TID_QUEUE_CELL_SPACING; + + /* The history is too long: remove data that is older than */ + /* TID_MAX_TIME_DIFF */ + if (index >= TID_QUEUE_MAX_SIZE) + rs_tl_rm_old_stats(tl, curr_time); + + index = (tl->head + index) % TID_QUEUE_MAX_SIZE; + tl->packet_count[index] = tl->packet_count[index] + 1; + tl->total = tl->total + 1; + + if ((index + 1) > tl->queue_count) + tl->queue_count = index + 1; + + return tid; +} + +/* + get the traffic load value for tid +*/ +static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid) +{ + u32 curr_time = jiffies_to_msecs(jiffies); + u32 time_diff; + s32 index; + struct iwl_traffic_load *tl = NULL; + + if (tid >= TID_MAX_LOAD_COUNT) + return 0; + + tl = &(lq_data->load[tid]); + + curr_time -= curr_time % TID_ROUND_VALUE; + + if (!(tl->queue_count)) + return 0; + + time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); + index = time_diff / TID_QUEUE_CELL_SPACING; + + /* The history is too long: remove data that is older than */ + /* TID_MAX_TIME_DIFF */ + if (index >= TID_QUEUE_MAX_SIZE) + rs_tl_rm_old_stats(tl, curr_time); + + return tl->total; +} + +static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv, + struct iwl_lq_sta *lq_data, u8 tid, + struct sta_info *sta) +{ + unsigned long state; + DECLARE_MAC_BUF(mac); + + spin_lock_bh(&sta->lock); + state = sta->ampdu_mlme.tid_state_tx[tid]; + spin_unlock_bh(&sta->lock); + + if (state == HT_AGG_STATE_IDLE && + rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) { + IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n", + print_mac(mac, sta->addr), tid); + ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid); + } +} + +static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid, + struct iwl_lq_sta *lq_data, + struct sta_info *sta) +{ + if ((tid < TID_MAX_LOAD_COUNT)) + rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta); + else if (tid == IWL_AGG_ALL_TID) + for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++) + rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta); +} + +static inline int get_num_of_ant_from_rate(u32 rate_n_flags) +{ + return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + + !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + + !!(rate_n_flags & RATE_MCS_ANT_C_MSK); +} + +/** + * rs_collect_tx_data - Update the success/failure sliding window + * + * We keep a sliding window of the last 62 packets transmitted + * at this rate. window->data contains the bitmask of successful + * packets. + */ +static int rs_collect_tx_data(struct iwl_rate_scale_data *windows, + int scale_index, s32 tpt, int retries, + int successes) +{ + struct iwl_rate_scale_data *window = NULL; + static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); + s32 fail_count; + + if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) + return -EINVAL; + + /* Select data for current tx bit rate */ + window = &(windows[scale_index]); + + /* + * Keep track of only the latest 62 tx frame attempts in this rate's + * history window; anything older isn't really relevant any more. + * If we have filled up the sliding window, drop the oldest attempt; + * if the oldest attempt (highest bit in bitmap) shows "success", + * subtract "1" from the success counter (this is the main reason + * we keep these bitmaps!). + */ + while (retries > 0) { + if (window->counter >= IWL_RATE_MAX_WINDOW) { + + /* remove earliest */ + window->counter = IWL_RATE_MAX_WINDOW - 1; + + if (window->data & mask) { + window->data &= ~mask; + window->success_counter--; + } + } + + /* Increment frames-attempted counter */ + window->counter++; + + /* Shift bitmap by one frame (throw away oldest history), + * OR in "1", and increment "success" if this + * frame was successful. */ + window->data <<= 1;; + if (successes > 0) { + window->success_counter++; + window->data |= 0x1; + successes--; + } + + retries--; + } + + /* Calculate current success ratio, avoid divide-by-0! */ + if (window->counter > 0) + window->success_ratio = 128 * (100 * window->success_counter) + / window->counter; + else + window->success_ratio = IWL_INVALID_VALUE; + + fail_count = window->counter - window->success_counter; + + /* Calculate average throughput, if we have enough history. */ + if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || + (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) + window->average_tpt = (window->success_ratio * tpt + 64) / 128; + else + window->average_tpt = IWL_INVALID_VALUE; + + /* Tag this window as having been updated */ + window->stamp = jiffies; + + return 0; +} + +/* + * Fill uCode API rate_n_flags field, based on "search" or "active" table. + */ +/* FIXME:RS:remove this function and put the flags statically in the table */ +static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl, + int index, u8 use_green) +{ + u32 rate_n_flags = 0; + + if (is_legacy(tbl->lq_type)) { + rate_n_flags = iwl_rates[index].plcp; + if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) + rate_n_flags |= RATE_MCS_CCK_MSK; + + } else if (is_Ht(tbl->lq_type)) { + if (index > IWL_LAST_OFDM_RATE) { + IWL_ERROR("invalid HT rate index %d\n", index); + index = IWL_LAST_OFDM_RATE; + } + rate_n_flags = RATE_MCS_HT_MSK; + + if (is_siso(tbl->lq_type)) + rate_n_flags |= iwl_rates[index].plcp_siso; + else if (is_mimo2(tbl->lq_type)) + rate_n_flags |= iwl_rates[index].plcp_mimo2; + else + rate_n_flags |= iwl_rates[index].plcp_mimo3; + } else { + IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type); + } + + rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) & + RATE_MCS_ANT_ABC_MSK); + + if (is_Ht(tbl->lq_type)) { + if (tbl->is_fat) { + if (tbl->is_dup) + rate_n_flags |= RATE_MCS_DUP_MSK; + else + rate_n_flags |= RATE_MCS_FAT_MSK; + } + if (tbl->is_SGI) + rate_n_flags |= RATE_MCS_SGI_MSK; + + if (use_green) { + rate_n_flags |= RATE_MCS_GF_MSK; + if (is_siso(tbl->lq_type) && tbl->is_SGI) { + rate_n_flags &= ~RATE_MCS_SGI_MSK; + IWL_ERROR("GF was set with SGI:SISO\n"); + } + } + } + return rate_n_flags; +} + +/* + * Interpret uCode API's rate_n_flags format, + * fill "search" or "active" tx mode table. + */ +static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags, + enum ieee80211_band band, + struct iwl_scale_tbl_info *tbl, + int *rate_idx) +{ + u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK); + u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags); + u8 mcs; + + *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags); + + if (*rate_idx == IWL_RATE_INVALID) { + *rate_idx = -1; + return -EINVAL; + } + tbl->is_SGI = 0; /* default legacy setup */ + tbl->is_fat = 0; + tbl->is_dup = 0; + tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS); + tbl->lq_type = LQ_NONE; + + /* legacy rate format */ + if (!(rate_n_flags & RATE_MCS_HT_MSK)) { + if (num_of_ant == 1) { + if (band == IEEE80211_BAND_5GHZ) + tbl->lq_type = LQ_A; + else + tbl->lq_type = LQ_G; + } + /* HT rate format */ + } else { + if (rate_n_flags & RATE_MCS_SGI_MSK) + tbl->is_SGI = 1; + + if ((rate_n_flags & RATE_MCS_FAT_MSK) || + (rate_n_flags & RATE_MCS_DUP_MSK)) + tbl->is_fat = 1; + + if (rate_n_flags & RATE_MCS_DUP_MSK) + tbl->is_dup = 1; + + mcs = rs_extract_rate(rate_n_flags); + + /* SISO */ + if (mcs <= IWL_RATE_SISO_60M_PLCP) { + if (num_of_ant == 1) + tbl->lq_type = LQ_SISO; /*else NONE*/ + /* MIMO2 */ + } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) { + if (num_of_ant == 2) + tbl->lq_type = LQ_MIMO2; + /* MIMO3 */ + } else { + if (num_of_ant == 3) + tbl->lq_type = LQ_MIMO3; + } + } + return 0; +} + +/* switch to another antenna/antennas and return 1 */ +/* if no other valid antenna found, return 0 */ +static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags, + struct iwl_scale_tbl_info *tbl) +{ + u8 new_ant_type; + + if (!tbl->ant_type || tbl->ant_type > ANT_ABC) + return 0; + + if (!rs_is_valid_ant(valid_ant, tbl->ant_type)) + return 0; + + new_ant_type = ant_toggle_lookup[tbl->ant_type]; + + while ((new_ant_type != tbl->ant_type) && + !rs_is_valid_ant(valid_ant, new_ant_type)) + new_ant_type = ant_toggle_lookup[new_ant_type]; + + if (new_ant_type == tbl->ant_type) + return 0; + + tbl->ant_type = new_ant_type; + *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK; + *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS; + return 1; +} + +/* FIXME:RS: in 4965 we don't use greenfield at all */ +/* FIXME:RS: don't use greenfield for now in TX */ +#if 0 +static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf) +{ + return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) && + priv->current_ht_config.is_green_field && + !priv->current_ht_config.non_GF_STA_present; +} +#endif +static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf) +{ + return 0; +} + +/** + * rs_get_supported_rates - get the available rates + * + * if management frame or broadcast frame only return + * basic available rates. + * + */ +static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, + struct ieee80211_hdr *hdr, + enum iwl_table_type rate_type) +{ + if (hdr && is_multicast_ether_addr(hdr->addr1) && + lq_sta->active_rate_basic) + return lq_sta->active_rate_basic; + + if (is_legacy(rate_type)) { + return lq_sta->active_legacy_rate; + } else { + if (is_siso(rate_type)) + return lq_sta->active_siso_rate; + else if (is_mimo2(rate_type)) + return lq_sta->active_mimo2_rate; + else + return lq_sta->active_mimo3_rate; + } +} + +static u16 rs_get_adjacent_rate(struct iwl_priv *priv, 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 = iwl_rates[low].prev_rs; + if (low == IWL_RATE_INVALID) + break; + if (rate_mask & (1 << low)) + break; + IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low); + } + + high = index; + while (high != IWL_RATE_INVALID) { + high = iwl_rates[high].next_rs; + if (high == IWL_RATE_INVALID) + break; + if (rate_mask & (1 << high)) + break; + IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high); + } + + return (high << 8) | low; +} + +static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta, + struct iwl_scale_tbl_info *tbl, + u8 scale_index, u8 ht_possible) +{ + s32 low; + u16 rate_mask; + u16 high_low; + u8 switch_to_legacy = 0; + u8 is_green = lq_sta->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_sta->band == IEEE80211_BAND_5GHZ) + tbl->lq_type = LQ_A; + else + tbl->lq_type = LQ_G; + + if (num_of_ant(tbl->ant_type) > 1) + tbl->ant_type = ANT_A;/*FIXME:RS*/ + + tbl->is_fat = 0; + tbl->is_SGI = 0; + } + + rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type); + + /* Mask with station rate restriction */ + if (is_legacy(tbl->lq_type)) { + /* supp_rates has no CCK bits in A mode */ + if (lq_sta->band == IEEE80211_BAND_5GHZ) + rate_mask = (u16)(rate_mask & + (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); + else + rate_mask = (u16)(rate_mask & lq_sta->supp_rates); + } + + /* If we switched from HT to legacy, check current rate */ + if (switch_to_legacy && (rate_mask & (1 << scale_index))) { + low = scale_index; + goto out; + } + + high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask, + tbl->lq_type); + low = high_low & 0xff; + + if (low == IWL_RATE_INVALID) + low = scale_index; + +out: + return rate_n_flags_from_tbl(tbl, low, is_green); +} + +/* + * mac80211 sends us Tx status + */ +static void rs_tx_status(void *priv_rate, struct net_device *dev, + struct sk_buff *skb) +{ + int status; + u8 retries; + int rs_index, index = 0; + struct iwl_lq_sta *lq_sta; + struct iwl_link_quality_cmd *table; + struct sta_info *sta; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct iwl_priv *priv = (struct iwl_priv *)priv_rate; + struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); + struct ieee80211_hw *hw = local_to_hw(local); + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct iwl_rate_scale_data *window = NULL; + struct iwl_rate_scale_data *search_win = NULL; + u32 tx_rate; + struct iwl_scale_tbl_info tbl_type; + struct iwl_scale_tbl_info *curr_tbl, *search_tbl; + u8 active_index = 0; + __le16 fc = 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; + + /* This packet was aggregated but doesn't carry rate scale info */ + if ((info->flags & IEEE80211_TX_CTL_AMPDU) && + !(info->flags & IEEE80211_TX_STAT_AMPDU)) + return; + + retries = info->status.retry_count; + + if (retries > 15) + retries = 15; + + rcu_read_lock(); + + sta = sta_info_get(local, hdr->addr1); + + if (!sta || !sta->rate_ctrl_priv) + goto out; + + + lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv; + + if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && + !lq_sta->ibss_sta_added) + goto out; + + table = &lq_sta->lq; + active_index = lq_sta->active_tbl; + + curr_tbl = &(lq_sta->lq_info[active_index]); + search_tbl = &(lq_sta->lq_info[(1 - active_index)]); + window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]); + search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]); + + /* + * 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). + */ + tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); + rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index); + if (priv->band == IEEE80211_BAND_5GHZ) + rs_index -= IWL_FIRST_OFDM_RATE; + + if ((info->tx_rate_idx < 0) || + (tbl_type.is_SGI ^ + !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) || + (tbl_type.is_fat ^ + !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) || + (tbl_type.is_dup ^ + !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) || + (tbl_type.ant_type ^ info->antenna_sel_tx) || + (!!(tx_rate & RATE_MCS_HT_MSK) ^ + !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) || + (!!(tx_rate & RATE_MCS_GF_MSK) ^ + !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) || + (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate != + hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) { + IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate); + goto out; + } + + /* 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_rate = le32_to_cpu(table->rs_table[index].rate_n_flags); + rs_get_tbl_info_from_mcs(tx_rate, priv->band, + &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.ant_type == search_tbl->ant_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, 1, 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.ant_type == curr_tbl->ant_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, 1, 0); + } + + /* If not searching for a new mode, increment failed counter + * ... this helps determine when to start searching again */ + if (lq_sta->stay_in_tbl) + lq_sta->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. + */ + tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags); + rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index); + + /* Update frame history window with "success" if Tx got ACKed ... */ + status = !!(info->flags & IEEE80211_TX_STAT_ACK); + + /* If type matches "search" table, + * add final tx status to "search" history */ + if ((tbl_type.lq_type == search_tbl->lq_type) && + (tbl_type.ant_type == search_tbl->ant_type) && + (tbl_type.is_SGI == search_tbl->is_SGI)) { + if (search_tbl->expected_tpt) + tpt = search_tbl->expected_tpt[rs_index]; + else + tpt = 0; + if (info->flags & IEEE80211_TX_CTL_AMPDU) + rs_collect_tx_data(search_win, rs_index, tpt, + info->status.ampdu_ack_len, + info->status.ampdu_ack_map); + else + rs_collect_tx_data(search_win, rs_index, tpt, + 1, 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.ant_type == curr_tbl->ant_type) && + (tbl_type.is_SGI == curr_tbl->is_SGI)) { + if (curr_tbl->expected_tpt) + tpt = curr_tbl->expected_tpt[rs_index]; + else + tpt = 0; + if (info->flags & IEEE80211_TX_CTL_AMPDU) + rs_collect_tx_data(window, rs_index, tpt, + info->status.ampdu_ack_len, + info->status.ampdu_ack_map); + else + rs_collect_tx_data(window, rs_index, tpt, + 1, status); + } + + /* If not searching for new mode, increment success/failed counter + * ... these help determine when to start searching again */ + if (lq_sta->stay_in_tbl) { + if (info->flags & IEEE80211_TX_CTL_AMPDU) { + lq_sta->total_success += info->status.ampdu_ack_map; + lq_sta->total_failed += + (info->status.ampdu_ack_len - info->status.ampdu_ack_map); + } else { + if (status) + lq_sta->total_success++; + else + lq_sta->total_failed++; + } + } + + /* See if there's a better rate or modulation mode to try. */ + rs_rate_scale_perform(priv, dev, hdr, sta); +out: + rcu_read_unlock(); + return; +} + +/* + * 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(struct iwl_priv *priv, u8 is_legacy, + struct iwl_lq_sta *lq_sta) +{ + IWL_DEBUG_RATE("we are staying in the same table\n"); + lq_sta->stay_in_tbl = 1; /* only place this gets set */ + if (is_legacy) { + lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT; + lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT; + lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT; + } else { + lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT; + lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT; + lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT; + } + lq_sta->table_count = 0; + lq_sta->total_failed = 0; + lq_sta->total_success = 0; +} + +/* + * Find correct throughput table for given mode of modulation + */ +static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, + struct iwl_scale_tbl_info *tbl) +{ + if (is_legacy(tbl->lq_type)) { + if (!is_a_band(tbl->lq_type)) + tbl->expected_tpt = expected_tpt_G; + else + tbl->expected_tpt = expected_tpt_A; + } else if (is_siso(tbl->lq_type)) { + if (tbl->is_fat && !lq_sta->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)) { /* FIXME:need to separate mimo2/3 */ + if (tbl->is_fat && !lq_sta->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; +} + +/* + * 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 iwl_priv *priv, + struct iwl_lq_sta *lq_sta, + struct iwl_scale_tbl_info *tbl, /* "search" */ + u16 rate_mask, s8 index) +{ + /* "active" values */ + struct iwl_scale_tbl_info *active_tbl = + &(lq_sta->lq_info[lq_sta->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; + s8 rate = index; + + new_rate = high = low = start_hi = IWL_RATE_INVALID; + + for (; ;) { + high_low = rs_get_adjacent_rate(priv, rate, rate_mask, + tbl->lq_type); + + low = high_low & 0xff; + high = (high_low >> 8) & 0xff; + + /* + * Lower the "search" bit rate, to give new "search" mode + * approximately the same throughput as "active" if: + * + * 1) "Active" mode has been working modestly well (but not + * great), and expected "search" throughput (under perfect + * conditions) at candidate rate is above the actual + * measured "active" throughput (but less than expected + * "active" throughput under perfect conditions). + * OR + * 2) "Active" mode has been working perfectly or very well + * and expected "search" throughput (under perfect + * conditions) at candidate rate is above expected + * "active" throughput (under perfect conditions). + */ + if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) && + ((active_sr > 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 { + break; + } + } + } + + return new_rate; +} + +/* + * Set up search table for MIMO + */ +static int rs_switch_to_mimo2(struct iwl_priv *priv, + struct iwl_lq_sta *lq_sta, + struct ieee80211_conf *conf, + struct sta_info *sta, + struct iwl_scale_tbl_info *tbl, int index) +{ + u16 rate_mask; + s32 rate; + s8 is_green = lq_sta->is_green; + + if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) || + !sta->ht_info.ht_supported) + return -1; + + if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC) + return -1; + + /* Need both Tx chains/antennas to support MIMO */ + if (priv->hw_params.tx_chains_num < 2) + return -1; + + IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n"); + + tbl->lq_type = LQ_MIMO2; + tbl->is_dup = lq_sta->is_dup; + tbl->action = 0; + rate_mask = lq_sta->active_mimo2_rate; + + if (priv->current_ht_config.supported_chan_width + == IWL_CHANNEL_WIDTH_40MHZ) + tbl->is_fat = 1; + else + tbl->is_fat = 0; + + /* FIXME: - don't toggle SGI here + if (tbl->is_fat) { + if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY) + tbl->is_SGI = 1; + else + tbl->is_SGI = 0; + } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY) + tbl->is_SGI = 1; + else + tbl->is_SGI = 0; + */ + + rs_set_expected_tpt_table(lq_sta, tbl); + + rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); + + IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask); + + if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { + IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n", + rate, rate_mask); + return -1; + } + tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green); + + IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n", + tbl->current_rate, is_green); + return 0; +} + +/* + * Set up search table for SISO + */ +static int rs_switch_to_siso(struct iwl_priv *priv, + struct iwl_lq_sta *lq_sta, + struct ieee80211_conf *conf, + struct sta_info *sta, + struct iwl_scale_tbl_info *tbl, int index) +{ + u16 rate_mask; + u8 is_green = lq_sta->is_green; + s32 rate; + + if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) || + !sta->ht_info.ht_supported) + return -1; + + IWL_DEBUG_RATE("LQ: try to switch to SISO\n"); + + tbl->is_dup = lq_sta->is_dup; + tbl->lq_type = LQ_SISO; + tbl->action = 0; + rate_mask = lq_sta->active_siso_rate; + + if (priv->current_ht_config.supported_chan_width + == IWL_CHANNEL_WIDTH_40MHZ) + tbl->is_fat = 1; + else + tbl->is_fat = 0; + + /* FIXME: - don't toggle SGI here + if (tbl->is_fat) { + if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY) + tbl->is_SGI = 1; + else + tbl->is_SGI = 0; + } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY) + tbl->is_SGI = 1; + else + tbl->is_SGI = 0; + */ + + if (is_green) + tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/ + + rs_set_expected_tpt_table(lq_sta, tbl); + rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); + + IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask); + if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { + IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n", + rate, rate_mask); + return -1; + } + tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green); + IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n", + tbl->current_rate, is_green); + return 0; +} + +/* + * Try to switch to new modulation mode from legacy + */ +static int rs_move_legacy_other(struct iwl_priv *priv, + struct iwl_lq_sta *lq_sta, + struct ieee80211_conf *conf, + struct sta_info *sta, + int index) +{ + struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + struct iwl_scale_tbl_info *search_tbl = + &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); + struct iwl_rate_scale_data *window = &(tbl->win[index]); + u32 sz = (sizeof(struct iwl_scale_tbl_info) - + (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); + u8 start_action = tbl->action; + u8 valid_tx_ant = priv->hw_params.valid_tx_ant; + int ret = 0; + + for (; ;) { + switch (tbl->action) { + case IWL_LEGACY_SWITCH_ANTENNA: + IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n"); + + lq_sta->action_counter++; + + /* Don't change antenna if success has been great */ + if (window->success_ratio >= IWL_RS_GOOD_RATIO) + break; + + /* Set up search table to try other antenna */ + memcpy(search_tbl, tbl, sz); + + if (rs_toggle_antenna(valid_tx_ant, + &search_tbl->current_rate, search_tbl)) { + lq_sta->search_better_tbl = 1; + goto out; + } + break; + case IWL_LEGACY_SWITCH_SISO: + IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n"); + + /* Set up search table to try SISO */ + memcpy(search_tbl, tbl, sz); + search_tbl->is_SGI = 0; + ret = rs_switch_to_siso(priv, lq_sta, conf, sta, + search_tbl, index); + if (!ret) { + lq_sta->search_better_tbl = 1; + lq_sta->action_counter = 0; + goto out; + } + + break; + case IWL_LEGACY_SWITCH_MIMO2: + IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n"); + + /* Set up search table to try MIMO */ + memcpy(search_tbl, tbl, sz); + search_tbl->is_SGI = 0; + search_tbl->ant_type = ANT_AB;/*FIXME:RS*/ + /*FIXME:RS:need to check ant validity*/ + ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, + search_tbl, index); + if (!ret) { + lq_sta->search_better_tbl = 1; + lq_sta->action_counter = 0; + goto out; + } + break; + } + tbl->action++; + if (tbl->action > IWL_LEGACY_SWITCH_MIMO2) + tbl->action = IWL_LEGACY_SWITCH_ANTENNA; + + if (tbl->action == start_action) + break; + + } + return 0; + + out: + tbl->action++; + if (tbl->action > IWL_LEGACY_SWITCH_MIMO2) + 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 iwl_priv *priv, + struct iwl_lq_sta *lq_sta, + struct ieee80211_conf *conf, + struct sta_info *sta, int index) +{ + u8 is_green = lq_sta->is_green; + struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + struct iwl_scale_tbl_info *search_tbl = + &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); + struct iwl_rate_scale_data *window = &(tbl->win[index]); + u32 sz = (sizeof(struct iwl_scale_tbl_info) - + (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); + u8 start_action = tbl->action; + u8 valid_tx_ant = priv->hw_params.valid_tx_ant; + int ret; + + for (;;) { + lq_sta->action_counter++; + switch (tbl->action) { + case IWL_SISO_SWITCH_ANTENNA: + IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n"); + if (window->success_ratio >= IWL_RS_GOOD_RATIO) + break; + + memcpy(search_tbl, tbl, sz); + if (rs_toggle_antenna(valid_tx_ant, + &search_tbl->current_rate, search_tbl)) { + lq_sta->search_better_tbl = 1; + goto out; + } + break; + case IWL_SISO_SWITCH_MIMO2: + IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n"); + memcpy(search_tbl, tbl, sz); + search_tbl->is_SGI = 0; + search_tbl->ant_type = ANT_AB; /*FIXME:RS*/ + ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, + search_tbl, index); + if (!ret) { + lq_sta->search_better_tbl = 1; + goto out; + } + break; + case IWL_SISO_SWITCH_GI: + if (!tbl->is_fat && + !(priv->current_ht_config.sgf & + HT_SHORT_GI_20MHZ)) + break; + if (tbl->is_fat && + !(priv->current_ht_config.sgf & + HT_SHORT_GI_40MHZ)) + break; + + IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n"); + + memcpy(search_tbl, tbl, sz); + if (is_green) { + if (!tbl->is_SGI) + break; + else + IWL_ERROR("SGI was set in GF+SISO\n"); + } + search_tbl->is_SGI = !tbl->is_SGI; + rs_set_expected_tpt_table(lq_sta, search_tbl); + if (tbl->is_SGI) { + s32 tpt = lq_sta->last_tpt / 100; + if (tpt >= search_tbl->expected_tpt[index]) + break; + } + search_tbl->current_rate = rate_n_flags_from_tbl( + search_tbl, index, is_green); + lq_sta->search_better_tbl = 1; + 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 iwl_priv *priv, + struct iwl_lq_sta *lq_sta, + struct ieee80211_conf *conf, + struct sta_info *sta, int index) +{ + s8 is_green = lq_sta->is_green; + struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + struct iwl_scale_tbl_info *search_tbl = + &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); + u32 sz = (sizeof(struct iwl_scale_tbl_info) - + (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); + u8 start_action = tbl->action; + /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/ + int ret; + + for (;;) { + lq_sta->action_counter++; + switch (tbl->action) { + case IWL_MIMO_SWITCH_ANTENNA_A: + case IWL_MIMO_SWITCH_ANTENNA_B: + IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n"); + + /* Set up new search table for SISO */ + memcpy(search_tbl, tbl, sz); + + /*FIXME:RS:need to check ant validity + C*/ + if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A) + search_tbl->ant_type = ANT_A; + else + search_tbl->ant_type = ANT_B; + + ret = rs_switch_to_siso(priv, lq_sta, conf, sta, + search_tbl, index); + if (!ret) { + lq_sta->search_better_tbl = 1; + goto out; + } + break; + + case IWL_MIMO_SWITCH_GI: + if (!tbl->is_fat && + !(priv->current_ht_config.sgf & + HT_SHORT_GI_20MHZ)) + break; + if (tbl->is_fat && + !(priv->current_ht_config.sgf & + HT_SHORT_GI_40MHZ)) + break; + + IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n"); + + /* Set up new search table for MIMO */ + memcpy(search_tbl, tbl, sz); + search_tbl->is_SGI = !tbl->is_SGI; + rs_set_expected_tpt_table(lq_sta, search_tbl); + /* + * If active table already uses the fastest possible + * modulation (dual stream with short guard interval), + * and it's working well, there's no need to look + * for a better type of modulation! + */ + if (tbl->is_SGI) { + s32 tpt = lq_sta->last_tpt / 100; + if (tpt >= search_tbl->expected_tpt[index]) + break; + } + search_tbl->current_rate = rate_n_flags_from_tbl( + search_tbl, index, is_green); + lq_sta->search_better_tbl = 1; + 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 iwl_lq_sta *lq_sta) +{ + struct iwl_scale_tbl_info *tbl; + int i; + int active_tbl; + int flush_interval_passed = 0; + struct iwl_priv *priv; + + priv = lq_sta->drv; + active_tbl = lq_sta->active_tbl; + + tbl = &(lq_sta->lq_info[active_tbl]); + + /* If we've been disallowing search, see if we should now allow it */ + if (lq_sta->stay_in_tbl) { + + /* Elapsed time using current modulation mode */ + if (lq_sta->flush_timer) + flush_interval_passed = + time_after(jiffies, + (unsigned long)(lq_sta->flush_timer + + IWL_RATE_SCALE_FLUSH_INTVL)); + + /* + * Check if we should allow search for new modulation mode. + * If many frames have failed or succeeded, or we've used + * this same modulation for a long time, allow search, and + * reset history stats that keep track of whether we should + * allow a new search. Also (below) reset all bitmaps and + * stats in active history. + */ + if ((lq_sta->total_failed > lq_sta->max_failure_limit) || + (lq_sta->total_success > lq_sta->max_success_limit) || + ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer) + && (flush_interval_passed))) { + IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:", + lq_sta->total_failed, + lq_sta->total_success, + flush_interval_passed); + + /* Allow search for new mode */ + lq_sta->stay_in_tbl = 0; /* only place reset */ + lq_sta->total_failed = 0; + lq_sta->total_success = 0; + lq_sta->flush_timer = 0; + + /* + * Else if we've used this modulation mode enough repetitions + * (regardless of elapsed time or success/failure), reset + * history bitmaps and rate-specific stats for all rates in + * active table. + */ + } else { + lq_sta->table_count++; + if (lq_sta->table_count >= + lq_sta->table_count_limit) { + lq_sta->table_count = 0; + + IWL_DEBUG_RATE("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_sta->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 iwl_priv *priv, + struct net_device *dev, + struct ieee80211_hdr *hdr, + struct sta_info *sta) +{ + struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); + struct ieee80211_hw *hw = local_to_hw(local); + struct ieee80211_conf *conf = &hw->conf; + int low = IWL_RATE_INVALID; + int high = IWL_RATE_INVALID; + int index; + int i; + struct iwl_rate_scale_data *window = NULL; + int current_tpt = IWL_INVALID_VALUE; + int low_tpt = IWL_INVALID_VALUE; + int high_tpt = IWL_INVALID_VALUE; + u32 fail_count; + s8 scale_action = 0; + __le16 fc; + u16 rate_mask; + u8 update_lq = 0; + struct iwl_lq_sta *lq_sta; + struct iwl_scale_tbl_info *tbl, *tbl1; + u16 rate_scale_index_msk = 0; + u32 rate; + u8 is_green = 0; + u8 active_tbl = 0; + u8 done_search = 0; + u16 high_low; + s32 sr; + u8 tid = MAX_TID_COUNT; + + IWL_DEBUG_RATE("rate scale calculate new rate for skb\n"); + + fc = 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; + + lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv; + + tid = rs_tl_add_packet(lq_sta, hdr); + + /* + * Select rate-scale / modulation-mode table to work with in + * the rest of this function: "search" if searching for better + * modulation mode, or "active" if doing rate scaling within a mode. + */ + if (!lq_sta->search_better_tbl) + active_tbl = lq_sta->active_tbl; + else + active_tbl = 1 - lq_sta->active_tbl; + + tbl = &(lq_sta->lq_info[active_tbl]); + is_green = lq_sta->is_green; + + /* current tx rate */ + index = sta->last_txrate_idx; + + IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index, + tbl->lq_type); + + /* rates available for this association, and for modulation mode */ + rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type); + + IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask); + + /* mask with station rate restriction */ + if (is_legacy(tbl->lq_type)) { + if (lq_sta->band == IEEE80211_BAND_5GHZ) + /* supp_rates has no CCK bits in A mode */ + rate_scale_index_msk = (u16) (rate_mask & + (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); + else + rate_scale_index_msk = (u16) (rate_mask & + lq_sta->supp_rates); + + } else + rate_scale_index_msk = rate_mask; + + if (!rate_scale_index_msk) + rate_scale_index_msk = rate_mask; + + if (!((1 << index) & rate_scale_index_msk)) { + IWL_ERROR("Current Rate is not valid\n"); + return; + } + + /* Get expected throughput table and history window for current rate */ + if (!tbl->expected_tpt) { + IWL_ERROR("tbl->expected_tpt is NULL\n"); + return; + } + + 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)) { + 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_sta); + + goto out; + + /* Else we have enough samples; calculate estimate of + * actual average throughput */ + } else { + /*FIXME:RS remove this else if we don't get this error*/ + if (window->average_tpt != ((window->success_ratio * + tbl->expected_tpt[index] + 64) / 128)) { + IWL_ERROR("expected_tpt should have been calculated" + " by now\n"); + window->average_tpt = ((window->success_ratio * + tbl->expected_tpt[index] + 64) / 128); + } + } + + /* If we are searching for better modulation mode, check success. */ + if (lq_sta->search_better_tbl) { + + /* If good success, continue using the "search" mode; + * no need to send new link quality command, since we're + * continuing to use the setup that we've been trying. */ + if (window->average_tpt > lq_sta->last_tpt) { + + IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE " + "suc=%d cur-tpt=%d old-tpt=%d\n", + window->success_ratio, + window->average_tpt, + lq_sta->last_tpt); + + if (!is_legacy(tbl->lq_type)) + lq_sta->enable_counter = 1; + + /* Swap tables; "search" becomes "active" */ + lq_sta->active_tbl = active_tbl; + current_tpt = window->average_tpt; + + /* Else poor success; go back to mode in "active" table */ + } else { + + IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE " + "suc=%d cur-tpt=%d old-tpt=%d\n", + window->success_ratio, + window->average_tpt, + lq_sta->last_tpt); + + /* Nullify "search" table */ + tbl->lq_type = LQ_NONE; + + /* Revert to "active" table */ + active_tbl = lq_sta->active_tbl; + tbl = &(lq_sta->lq_info[active_tbl]); + + /* Revert to "active" rate and throughput info */ + index = iwl_hwrate_to_plcp_idx(tbl->current_rate); + current_tpt = lq_sta->last_tpt; + + /* Need to set up a new rate table in uCode */ + update_lq = 1; + } + + /* Either way, we've made a decision; modulation mode + * search is done, allow rate adjustment next time. */ + lq_sta->search_better_tbl = 0; + done_search = 1; /* Don't switch modes below! */ + goto lq_update; + } + + /* (Else) not in search of better modulation mode, try for better + * starting rate, while staying in this mode. */ + high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk, + tbl->lq_type); + low = high_low & 0xff; + high = (high_low >> 8) & 0xff; + + sr = window->success_ratio; + + /* 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; + + scale_action = 0; + + /* Too many failures, decrease rate */ + if ((sr <= 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)) { + + if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) + scale_action = 1; + else if (low != IWL_RATE_INVALID) + 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 && + sr >= IWL_RATE_INCREASE_TH) { + 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 if (sr >= IWL_RATE_INCREASE_TH) { + scale_action = 1; + } + } + } + + /* Sanity check; asked for decrease, but success rate or throughput + * has been good at old rate. Don't change it. */ + if ((scale_action == -1) && (low != IWL_RATE_INVALID) && + ((sr > IWL_RATE_HIGH_TH) || + (current_tpt > (100 * tbl->expected_tpt[low])))) + scale_action = 0; + + switch (scale_action) { + case -1: + /* Decrease starting rate, update uCode's rate table */ + if (low != 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_RATE("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) { + rate = rate_n_flags_from_tbl(tbl, index, is_green); + rs_fill_link_cmd(priv, lq_sta, rate); + iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC); + } + + /* Should we stay with this modulation mode, or search for a new one? */ + rs_stay_in_table(lq_sta); + + /* + * Search for new modulation mode if we're: + * 1) Not changing rates right now + * 2) Not just finishing up a search + * 3) Allowing a new search + */ + if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) { + /* Save current throughput to compare with "search" throughput*/ + lq_sta->last_tpt = current_tpt; + + /* Select a new "search" modulation mode to try. + * If one is found, set up the new "search" table. */ + if (is_legacy(tbl->lq_type)) + rs_move_legacy_other(priv, lq_sta, conf, sta, index); + else if (is_siso(tbl->lq_type)) + rs_move_siso_to_other(priv, lq_sta, conf, sta, index); + else + rs_move_mimo_to_other(priv, lq_sta, conf, sta, index); + + /* If new "search" mode was selected, set up in uCode table */ + if (lq_sta->search_better_tbl) { + /* Access the "search" table, clear its history. */ + tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); + for (i = 0; i < IWL_RATE_COUNT; i++) + rs_rate_scale_clear_window(&(tbl->win[i])); + + /* Use new "search" start rate */ + index = iwl_hwrate_to_plcp_idx(tbl->current_rate); + + IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n", + tbl->current_rate, index); + rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); + iwl_send_lq_cmd(priv, &lq_sta->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_sta->lq_info[lq_sta->active_tbl]); + if (is_legacy(tbl1->lq_type) && + (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) && + (lq_sta->action_counter >= 1)) { + lq_sta->action_counter = 0; + IWL_DEBUG_RATE("LQ: STAY in legacy table\n"); + rs_set_stay_in_table(priv, 1, lq_sta); + } + + /* If we're in an HT mode, and all 3 mode switch actions + * have been tried and compared, stay in this best modulation + * mode for a while before next round of mode comparisons. */ + if (lq_sta->enable_counter && + (lq_sta->action_counter >= IWL_ACTION_LIMIT)) { + if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && + (lq_sta->tx_agg_tid_en & (1 << tid)) && + (tid != MAX_TID_COUNT)) { + IWL_DEBUG_RATE("try to aggregate tid %d\n", tid); + rs_tl_turn_on_agg(priv, tid, lq_sta, sta); + } + lq_sta->action_counter = 0; + rs_set_stay_in_table(priv, 0, lq_sta); + } + + /* + * 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_sta->flush_timer)) + lq_sta->flush_timer = jiffies; + } + +out: + tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green); + i = index; + sta->last_txrate_idx = i; + + /* sta->txrate_idx is an index to A mode rates which start + * at IWL_FIRST_OFDM_RATE + */ + if (lq_sta->band == IEEE80211_BAND_5GHZ) + sta->txrate_idx = i - IWL_FIRST_OFDM_RATE; + else + sta->txrate_idx = i; + + return; +} + + +static void rs_initialize_lq(struct iwl_priv *priv, + struct ieee80211_conf *conf, + struct sta_info *sta) +{ + struct iwl_lq_sta *lq_sta; + struct iwl_scale_tbl_info *tbl; + int rate_idx; + int i; + u32 rate; + u8 use_green = rs_use_green(priv, conf); + u8 active_tbl = 0; + u8 valid_tx_ant; + + if (!sta || !sta->rate_ctrl_priv) + goto out; + + lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv; + i = sta->last_txrate_idx; + + if ((lq_sta->lq.sta_id == 0xff) && + (priv->iw_mode == IEEE80211_IF_TYPE_IBSS)) + goto out; + + valid_tx_ant = priv->hw_params.valid_tx_ant; + + if (!lq_sta->search_better_tbl) + active_tbl = lq_sta->active_tbl; + else + active_tbl = 1 - lq_sta->active_tbl; + + tbl = &(lq_sta->lq_info[active_tbl]); + + if ((i < 0) || (i >= IWL_RATE_COUNT)) + i = 0; + + /* FIXME:RS: This is also wrong in 4965 */ + rate = iwl_rates[i].plcp; + rate |= RATE_MCS_ANT_B_MSK; + rate &= ~RATE_MCS_ANT_A_MSK; + + if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE) + rate |= RATE_MCS_CCK_MSK; + + tbl->ant_type = ANT_B; + rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx); + if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type)) + rs_toggle_antenna(valid_tx_ant, &rate, tbl); + + rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green); + tbl->current_rate = rate; + rs_set_expected_tpt_table(lq_sta, tbl); + rs_fill_link_cmd(NULL, lq_sta, rate); + iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC); + out: + return; +} + +static void rs_get_rate(void *priv_rate, struct net_device *dev, + struct ieee80211_supported_band *sband, + struct sk_buff *skb, + struct rate_selection *sel) +{ + + int i; + struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); + struct ieee80211_conf *conf = &local->hw.conf; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct sta_info *sta; + __le16 fc; + struct iwl_priv *priv = (struct iwl_priv *)priv_rate; + struct iwl_lq_sta *lq_sta; + + IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n"); + + rcu_read_lock(); + + sta = sta_info_get(local, hdr->addr1); + + /* Send management frames and broadcast/multicast data using lowest + * rate. */ + fc = hdr->frame_control; + if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) || + !sta || !sta->rate_ctrl_priv) { + sel->rate_idx = rate_lowest_index(local, sband, sta); + goto out; + } + + lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv; + i = sta->last_txrate_idx; + + if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && + !lq_sta->ibss_sta_added) { + u8 sta_id = iwl_find_station(priv, hdr->addr1); + DECLARE_MAC_BUF(mac); + + if (sta_id == IWL_INVALID_STATION) { + IWL_DEBUG_RATE("LQ: ADD station %s\n", + print_mac(mac, hdr->addr1)); + sta_id = iwl_add_station_flags(priv, hdr->addr1, + 0, CMD_ASYNC, NULL); + } + if ((sta_id != IWL_INVALID_STATION)) { + lq_sta->lq.sta_id = sta_id; + lq_sta->lq.rs_table[0].rate_n_flags = 0; + lq_sta->ibss_sta_added = 1; + rs_initialize_lq(priv, conf, sta); + } + } + + if ((i < 0) || (i > IWL_RATE_COUNT)) { + sel->rate_idx = rate_lowest_index(local, sband, sta); + goto out; + } + + if (sband->band == IEEE80211_BAND_5GHZ) + i -= IWL_FIRST_OFDM_RATE; + sel->rate_idx = i; +out: + rcu_read_unlock(); +} + +static void *rs_alloc_sta(void *priv_rate, gfp_t gfp) +{ + struct iwl_lq_sta *lq_sta; + struct iwl_priv *priv; + int i, j; + + priv = (struct iwl_priv *)priv_rate; + IWL_DEBUG_RATE("create station rate scale window\n"); + + lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp); + + if (lq_sta == NULL) + return NULL; + lq_sta->lq.sta_id = 0xff; + + + for (j = 0; j < LQ_SIZE; j++) + for (i = 0; i < IWL_RATE_COUNT; i++) + rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); + + return lq_sta; +} + +static void rs_rate_init(void *priv_rate, void *priv_sta, + struct ieee80211_local *local, + struct sta_info *sta) +{ + int i, j; + struct ieee80211_conf *conf = &local->hw.conf; + struct ieee80211_supported_band *sband; + struct iwl_priv *priv = (struct iwl_priv *)priv_rate; + struct iwl_lq_sta *lq_sta = priv_sta; + + sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; + + lq_sta->flush_timer = 0; + lq_sta->supp_rates = sta->supp_rates[sband->band]; + sta->txrate_idx = 3; + for (j = 0; j < LQ_SIZE; j++) + for (i = 0; i < IWL_RATE_COUNT; i++) + rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); + + IWL_DEBUG_RATE("LQ: *** 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.. */ + + lq_sta->ibss_sta_added = 0; + if (priv->iw_mode == IEEE80211_IF_TYPE_AP) { + u8 sta_id = iwl_find_station(priv, sta->addr); + DECLARE_MAC_BUF(mac); + + /* for IBSS the call are from tasklet */ + IWL_DEBUG_RATE("LQ: ADD station %s\n", + print_mac(mac, sta->addr)); + + if (sta_id == IWL_INVALID_STATION) { + IWL_DEBUG_RATE("LQ: ADD station %s\n", + print_mac(mac, sta->addr)); + sta_id = iwl_add_station_flags(priv, sta->addr, + 0, CMD_ASYNC, NULL); + } + if ((sta_id != IWL_INVALID_STATION)) { + lq_sta->lq.sta_id = sta_id; + lq_sta->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 < sband->n_bitrates; i++) + if (sta->supp_rates[sband->band] & BIT(i)) + sta->txrate_idx = i; + + sta->last_txrate_idx = sta->txrate_idx; + /* WTF is with this bogus comment? A doesn't have cck rates */ + /* For MODE_IEEE80211A, cck rates are at end of rate table */ + if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) + sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; + + lq_sta->is_dup = 0; + lq_sta->is_green = rs_use_green(priv, conf); + lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000); + lq_sta->active_rate_basic = priv->active_rate_basic; + lq_sta->band = priv->band; + /* + * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3), + * supp_rates[] does not; shift to convert format, force 9 MBits off. + */ + lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1; + lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1; + lq_sta->active_siso_rate &= ~((u16)0x2); + lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; + + /* Same here */ + lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1; + lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1; + lq_sta->active_mimo2_rate &= ~((u16)0x2); + lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; + + lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1; + lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1; + lq_sta->active_mimo3_rate &= ~((u16)0x2); + lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE; + + IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n", + lq_sta->active_siso_rate, + lq_sta->active_mimo2_rate, + lq_sta->active_mimo3_rate); + + /* These values will be overriden later */ + lq_sta->lq.general_params.single_stream_ant_msk = ANT_A; + lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB; + + /* as default allow aggregation for all tids */ + lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; + lq_sta->drv = priv; + + rs_initialize_lq(priv, conf, sta); +} + +static void rs_fill_link_cmd(const struct iwl_priv *priv, + struct iwl_lq_sta *lq_sta, u32 new_rate) +{ + struct iwl_scale_tbl_info tbl_type; + int index = 0; + int rate_idx; + int repeat_rate = 0; + u8 ant_toggle_cnt = 0; + u8 use_ht_possible = 1; + u8 valid_tx_ant = 0; + struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq; + + /* Override starting rate (index 0) if needed for debug purposes */ + rs_dbgfs_set_mcs(lq_sta, &new_rate, index); + + /* Interpret new_rate (rate_n_flags) */ + memset(&tbl_type, 0, sizeof(tbl_type)); + rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, + &tbl_type, &rate_idx); + + /* How many times should we repeat the initial rate? */ + if (is_legacy(tbl_type.lq_type)) { + ant_toggle_cnt = 1; + repeat_rate = 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(new_rate); + + if (num_of_ant(tbl_type.ant_type) == 1) { + lq_cmd->general_params.single_stream_ant_msk = + tbl_type.ant_type; + } else if (num_of_ant(tbl_type.ant_type) == 2) { + lq_cmd->general_params.dual_stream_ant_msk = + tbl_type.ant_type; + } /* otherwise we don't modify the existing value */ + + index++; + repeat_rate--; + + if (priv) + valid_tx_ant = priv->hw_params.valid_tx_ant; + + /* 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_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) + ant_toggle_cnt++; + else if (priv && + rs_toggle_antenna(valid_tx_ant, + &new_rate, &tbl_type)) + ant_toggle_cnt = 1; +} + + /* Override next rate if needed for debug purposes */ + rs_dbgfs_set_mcs(lq_sta, &new_rate, index); + + /* Fill next table entry */ + lq_cmd->rs_table[index].rate_n_flags = + cpu_to_le32(new_rate); + repeat_rate--; + index++; + } + + rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type, + &rate_idx); + + /* Indicate to uCode which entries might be MIMO. + * If initial rate was MIMO, this will finally end up + * as (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 */ + new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx, + use_ht_possible); + + /* How many times should we repeat the next rate? */ + if (is_legacy(tbl_type.lq_type)) { + if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) + ant_toggle_cnt++; + else if (priv && + rs_toggle_antenna(valid_tx_ant, + &new_rate, &tbl_type)) + ant_toggle_cnt = 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_sta, &new_rate, index); + + /* Fill next table entry */ + lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); + + index++; + repeat_rate--; + } + + lq_cmd->agg_params.agg_frame_cnt_limit = 64; + 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) +{ +#ifdef CONFIG_IWLWIFI_DEBUG + struct iwl_priv *priv = (struct iwl_priv *) priv_rate; + + IWL_DEBUG_RATE("enter\n"); + + /* TODO - add rate scale state reset */ + + IWL_DEBUG_RATE("leave\n"); +#endif /* CONFIG_IWLWIFI_DEBUG */ +} + +static void rs_free_sta(void *priv_rate, void *priv_sta) +{ + struct iwl_lq_sta *lq_sta = priv_sta; + struct iwl_priv *priv; + + priv = (struct iwl_priv *)priv_rate; + IWL_DEBUG_RATE("enter\n"); + kfree(lq_sta); + 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 iwl_lq_sta *lq_sta, + u32 *rate_n_flags, int index) +{ + struct iwl_priv *priv; + + priv = lq_sta->drv; + if (lq_sta->dbg_fixed_rate) { + if (index < 12) { + *rate_n_flags = lq_sta->dbg_fixed_rate; + } else { + if (lq_sta->band == IEEE80211_BAND_5GHZ) + *rate_n_flags = 0x800D; + else + *rate_n_flags = 0x820A; + } + IWL_DEBUG_RATE("Fixed rate ON\n"); + } else { + 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 iwl_lq_sta *lq_sta = file->private_data; + struct iwl_priv *priv; + char buf[64]; + int buf_size; + u32 parsed_rate; + + priv = lq_sta->drv; + memset(buf, 0, sizeof(buf)); + buf_size = min(count, sizeof(buf) - 1); + if (copy_from_user(buf, user_buf, buf_size)) + return -EFAULT; + + if (sscanf(buf, "%x", &parsed_rate) == 1) + lq_sta->dbg_fixed_rate = parsed_rate; + else + lq_sta->dbg_fixed_rate = 0; + + lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ + lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ + lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ + lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ + + IWL_DEBUG_RATE("sta_id %d rate 0x%X\n", + lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate); + + if (lq_sta->dbg_fixed_rate) { + rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate); + iwl_send_lq_cmd(lq_sta->drv, &lq_sta->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 iwl_lq_sta *lq_sta = file->private_data; + + desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); + desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n", + lq_sta->total_failed, lq_sta->total_success, + lq_sta->active_legacy_rate); + desc += sprintf(buff+desc, "fixed rate 0x%X\n", + lq_sta->dbg_fixed_rate); + desc += sprintf(buff+desc, "general:" + "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n", + lq_sta->lq.general_params.flags, + lq_sta->lq.general_params.mimo_delimiter, + lq_sta->lq.general_params.single_stream_ant_msk, + lq_sta->lq.general_params.dual_stream_ant_msk); + + desc += sprintf(buff+desc, "agg:" + "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", + le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit), + lq_sta->lq.agg_params.agg_dis_start_th, + lq_sta->lq.agg_params.agg_frame_cnt_limit); + + desc += sprintf(buff+desc, + "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", + lq_sta->lq.general_params.start_rate_index[0], + lq_sta->lq.general_params.start_rate_index[1], + lq_sta->lq.general_params.start_rate_index[2], + lq_sta->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(lq_sta->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 iwl_lq_sta *lq_sta = 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", + lq_sta->active_tbl == i?"*":"x", + lq_sta->lq_info[i].lq_type, + lq_sta->lq_info[i].is_SGI, + lq_sta->lq_info[i].is_fat, + lq_sta->lq_info[i].is_dup, + lq_sta->lq_info[i].current_rate); + for (j = 0; j < IWL_RATE_COUNT; j++) { + desc += sprintf(buff+desc, + "counter=%d success=%d %%=%d\n", + lq_sta->lq_info[i].win[j].counter, + lq_sta->lq_info[i].win[j].success_counter, + lq_sta->lq_info[i].win[j].success_ratio); + } + } + 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 iwl_lq_sta *lq_sta = priv_sta; + lq_sta->rs_sta_dbgfs_scale_table_file = + debugfs_create_file("rate_scale_table", 0600, dir, + lq_sta, &rs_sta_dbgfs_scale_table_ops); + lq_sta->rs_sta_dbgfs_stats_table_file = + debugfs_create_file("rate_stats_table", 0600, dir, + lq_sta, &rs_sta_dbgfs_stats_table_ops); + lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file = + debugfs_create_u8("tx_agg_tid_enable", 0600, dir, + &lq_sta->tx_agg_tid_en); + +} + +static void rs_remove_debugfs(void *priv, void *priv_sta) +{ + struct iwl_lq_sta *lq_sta = priv_sta; + debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file); + debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); + debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_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 iwlagn_rate_control_register(void) +{ + return ieee80211_rate_control_register(&rs_ops); +} + +void iwlagn_rate_control_unregister(void) +{ + ieee80211_rate_control_unregister(&rs_ops); +} + |