| /****************************************************************************** |
| * |
| * 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-core.h" |
| #include "iwl-helpers.h" |
| |
| #define RS_NAME "iwl-4965-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 iwl4965_rate_scale_data -- tx success history for one rate |
| */ |
| struct iwl4965_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 iwl4965_scale_tbl_info -- tx params and success history for all rates |
| * |
| * There are two of these in struct iwl4965_lq_sta, |
| * one for "active", and one for "search". |
| */ |
| struct iwl4965_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 iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */ |
| }; |
| |
| #ifdef CONFIG_IWL4965_HT |
| |
| struct iwl4965_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 */ |
| }; |
| |
| #endif /* CONFIG_IWL4965_HT */ |
| |
| /** |
| * struct iwl4965_lq_sta -- driver's rate scaling private structure |
| * |
| * Pointer to this gets passed back and forth between driver and mac80211. |
| */ |
| struct iwl4965_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 iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */ |
| #ifdef CONFIG_IWL4965_HT |
| struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT]; |
| u8 tx_agg_tid_en; |
| #endif |
| #ifdef CONFIG_MAC80211_DEBUGFS |
| struct dentry *rs_sta_dbgfs_scale_table_file; |
| struct dentry *rs_sta_dbgfs_stats_table_file; |
| #ifdef CONFIG_IWL4965_HT |
| struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file; |
| #endif |
| 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 iwl4965_lq_sta *lq_sta, |
| u32 rate_n_flags); |
| |
| |
| #ifdef CONFIG_MAC80211_DEBUGFS |
| static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta, |
| u32 *rate_n_flags, int index); |
| #else |
| static void rs_dbgfs_set_mcs(struct iwl4965_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 iwl4965_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); |
| } |
| |
| #ifdef CONFIG_IWL4965_HT |
| /* |
| * 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 iwl4965_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 void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, |
| struct ieee80211_hdr *hdr) |
| { |
| u32 curr_time = jiffies_to_msecs(jiffies); |
| u32 time_diff; |
| s32 index; |
| struct iwl4965_traffic_load *tl = NULL; |
| u16 fc = le16_to_cpu(hdr->frame_control); |
| u8 tid; |
| |
| if (ieee80211_is_qos_data(fc)) { |
| u8 *qc = ieee80211_get_qos_ctrl(hdr, ieee80211_get_hdrlen(fc)); |
| tid = qc[0] & 0xf; |
| } else |
| return; |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| /* |
| get the traffic load value for tid |
| */ |
| static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid) |
| { |
| u32 curr_time = jiffies_to_msecs(jiffies); |
| u32 time_diff; |
| s32 index; |
| struct iwl4965_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 iwl4965_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 iwl4965_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); |
| } |
| |
| #endif /* CONFIG_IWLWIFI_HT */ |
| |
| 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 iwl4965_rate_scale_data *windows, |
| int scale_index, s32 tpt, int retries, |
| int successes) |
| { |
| struct iwl4965_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 iwl4965_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 iwl4965_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 = iwl4965_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 iwl4965_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 */ |
| /* #ifdef CONFIG_IWL4965_HT */ |
| #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); |
| } |
| #else |
| static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_IWL4965_HT */ |
| |
| /** |
| * 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 iwl4965_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 iwl4965_lq_sta *lq_sta, |
| struct iwl4965_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, |
| struct ieee80211_tx_status *tx_resp) |
| { |
| int status; |
| u8 retries; |
| int rs_index, index = 0; |
| struct iwl4965_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 iwl4965_rate_scale_data *window = NULL; |
| struct iwl4965_rate_scale_data *search_win = NULL; |
| u32 tx_rate; |
| 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; |
| |
| /* This packet was aggregated but doesn't carry rate scale info */ |
| if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) && |
| !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU)) |
| return; |
| |
| retries = tx_resp->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 iwl4965_lq_sta *)sta->rate_ctrl_priv; |
| |
| if (!priv->lq_mngr.lq_ready) |
| goto out; |
| |
| 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 iwl4965_rate_scale_data *) |
| &(curr_tbl->win[0]); |
| search_win = (struct iwl4965_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 ((tx_resp->control.tx_rate == NULL) || |
| (tbl_type.is_SGI ^ |
| !!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) || |
| (tbl_type.is_fat ^ |
| !!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) || |
| (tbl_type.is_dup ^ |
| !!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) || |
| (tbl_type.ant_type ^ tx_resp->control.antenna_sel_tx) || |
| (!!(tx_rate & RATE_MCS_HT_MSK) ^ |
| !!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) || |
| (!!(tx_rate & RATE_MCS_GF_MSK) ^ |
| !!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) || |
| (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate != |
| tx_resp->control.tx_rate->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 ... */ |
| 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.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 (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) |
| rs_collect_tx_data(search_win, rs_index, tpt, |
| tx_resp->ampdu_ack_len, |
| tx_resp->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 (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) |
| rs_collect_tx_data(window, rs_index, tpt, |
| tx_resp->ampdu_ack_len, |
| tx_resp->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 (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) { |
| lq_sta->total_success += tx_resp->ampdu_ack_map; |
| lq_sta->total_failed += |
| (tx_resp->ampdu_ack_len - tx_resp->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 iwl4965_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 iwl4965_lq_sta *lq_sta, |
| 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_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; |
| } |
| |
| #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 iwl_priv *priv, |
| struct iwl4965_lq_sta *lq_sta, |
| struct iwl4965_scale_tbl_info *tbl, /* "search" */ |
| u16 rate_mask, s8 index) |
| { |
| /* "active" values */ |
| struct iwl4965_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 { |
| new_rate = rate; |
| break; |
| } |
| } |
| } |
| |
| return new_rate; |
| } |
| #endif /* CONFIG_IWL4965_HT */ |
| |
| /* |
| * Set up search table for MIMO |
| */ |
| #ifdef CONFIG_IWL4965_HT |
| static int rs_switch_to_mimo2(struct iwl_priv *priv, |
| struct iwl4965_lq_sta *lq_sta, |
| struct ieee80211_conf *conf, |
| struct sta_info *sta, |
| struct iwl4965_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; |
| } |
| #else |
| static int rs_switch_to_mimo2(struct iwl_priv *priv, |
| struct iwl4965_lq_sta *lq_sta, |
| struct ieee80211_conf *conf, |
| struct sta_info *sta, |
| struct iwl4965_scale_tbl_info *tbl, int index) |
| { |
| return -1; |
| } |
| #endif /*CONFIG_IWL4965_HT */ |
| |
| /* |
| * Set up search table for SISO |
| */ |
| static int rs_switch_to_siso(struct iwl_priv *priv, |
| struct iwl4965_lq_sta *lq_sta, |
| struct ieee80211_conf *conf, |
| struct sta_info *sta, |
| struct iwl4965_scale_tbl_info *tbl, int index) |
| { |
| #ifdef CONFIG_IWL4965_HT |
| 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; |
| #else |
| return -1; |
| #endif /*CONFIG_IWL4965_HT */ |
| } |
| |
| /* |
| * Try to switch to new modulation mode from legacy |
| */ |
| static int rs_move_legacy_other(struct iwl_priv *priv, |
| struct iwl4965_lq_sta *lq_sta, |
| struct ieee80211_conf *conf, |
| struct sta_info *sta, |
| int index) |
| { |
| struct iwl4965_scale_tbl_info *tbl = |
| &(lq_sta->lq_info[lq_sta->active_tbl]); |
| struct iwl4965_scale_tbl_info *search_tbl = |
| &(lq_sta->lq_info[(1 - lq_sta->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; |
| 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; |
| } |
| |
| 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 iwl4965_lq_sta *lq_sta, |
| struct ieee80211_conf *conf, |
| struct sta_info *sta, |
| int index) |
| { |
| u8 is_green = lq_sta->is_green; |
| struct iwl4965_scale_tbl_info *tbl = |
| &(lq_sta->lq_info[lq_sta->active_tbl]); |
| struct iwl4965_scale_tbl_info *search_tbl = |
| &(lq_sta->lq_info[(1 - lq_sta->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; |
| 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; |
| } |
| |
| case IWL_SISO_SWITCH_MIMO2: |
| IWL_DEBUG_RATE("LQ: SISO switch to MIMO\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 iwl4965_lq_sta *lq_sta, |
| struct ieee80211_conf *conf, |
| struct sta_info *sta, |
| int index) |
| { |
| s8 is_green = lq_sta->is_green; |
| struct iwl4965_scale_tbl_info *tbl = |
| &(lq_sta->lq_info[lq_sta->active_tbl]); |
| struct iwl4965_scale_tbl_info *search_tbl = |
| &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); |
| u32 sz = (sizeof(struct iwl4965_scale_tbl_info) - |
| (sizeof(struct iwl4965_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 iwl4965_lq_sta *lq_sta) |
| { |
| struct iwl4965_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 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_lq_sta *lq_sta; |
| struct iwl4965_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; |
| #ifdef CONFIG_IWL4965_HT |
| u8 tid = MAX_TID_COUNT; |
| #endif |
| |
| 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_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv; |
| |
| #ifdef CONFIG_IWL4965_HT |
| rs_tl_add_packet(lq_sta, hdr); |
| #endif |
| /* |
| * 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 = iwl4965_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; |
| |
| /* 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_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) { |
| /* 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 = iwl4965_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) && |
| #ifdef CONFIG_IWL4965_HT |
| (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) && |
| #endif |
| (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)) { |
| #ifdef CONFIG_IWL4965_HT |
| 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); |
| } |
| #endif /*CONFIG_IWL4965_HT */ |
| 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 iwl4965_lq_sta *lq_sta; |
| struct iwl4965_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 iwl4965_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; |
| u16 fc; |
| struct iwl_priv *priv = (struct iwl_priv *)priv_rate; |
| struct iwl4965_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 = le16_to_cpu(hdr->frame_control); |
| if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) || |
| !sta || !sta->rate_ctrl_priv) { |
| sel->rate = rate_lowest(local, sband, sta); |
| goto out; |
| } |
| |
| lq_sta = (struct iwl4965_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 (!lq_sta->ibss_sta_added) |
| goto done; |
| } |
| |
| done: |
| if ((i < 0) || (i > IWL_RATE_COUNT)) { |
| sel->rate = rate_lowest(local, sband, sta); |
| goto out; |
| } |
| |
| sel->rate = &priv->ieee_rates[i]; |
| out: |
| rcu_read_unlock(); |
| } |
| |
| static void *rs_alloc_sta(void *priv_rate, gfp_t gfp) |
| { |
| struct iwl4965_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 iwl4965_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 iwl4965_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; |
| #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. |
| */ |
| lq_sta->active_siso_rate = |
| priv->current_ht_config.supp_mcs_set[0] << 1; |
| lq_sta->active_siso_rate |= |
| priv->current_ht_config.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 = |
| priv->current_ht_config.supp_mcs_set[1] << 1; |
| lq_sta->active_mimo2_rate |= |
| priv->current_ht_config.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 = |
| priv->current_ht_config.supp_mcs_set[2] << 1; |
| lq_sta->active_mimo3_rate |= |
| priv->current_ht_config.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; |
| #endif /*CONFIG_IWL4965_HT*/ |
| #ifdef CONFIG_MAC80211_DEBUGFS |
| lq_sta->drv = priv; |
| #endif |
| |
| if (priv->assoc_station_added) |
| priv->lq_mngr.lq_ready = 1; |
| |
| rs_initialize_lq(priv, conf, sta); |
| } |
| |
| static void rs_fill_link_cmd(const struct iwl_priv *priv, |
| struct iwl4965_lq_sta *lq_sta, |
| u32 new_rate) |
| { |
| struct iwl4965_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_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 iwl_priv *priv = (struct iwl_priv *) priv_rate; |
| |
| IWL_DEBUG_RATE("enter\n"); |
| |
| priv->lq_mngr.lq_ready = 0; |
| |
| IWL_DEBUG_RATE("leave\n"); |
| } |
| |
| static void rs_free_sta(void *priv_rate, void *priv_sta) |
| { |
| struct iwl4965_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 iwl4965_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 iwl4965_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 iwl4965_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 iwl4965_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 iwl4965_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); |
| #ifdef CONFIG_IWL4965_HT |
| 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); |
| #endif |
| |
| } |
| |
| static void rs_remove_debugfs(void *priv, void *priv_sta) |
| { |
| struct iwl4965_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); |
| #ifdef CONFIG_IWL4965_HT |
| debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file); |
| #endif |
| } |
| #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 iwl_priv *priv = hw->priv; |
| struct iwl4965_lq_sta *lq_sta; |
| struct sta_info *sta; |
| int cnt = 0, i; |
| u32 samples = 0, success = 0, good = 0; |
| unsigned long now = jiffies; |
| u32 max_time = 0; |
| u8 lq_type, antenna; |
| |
| rcu_read_lock(); |
| |
| sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr); |
| if (!sta || !sta->rate_ctrl_priv) { |
| if (sta) |
| IWL_DEBUG_RATE("leave - no private rate data!\n"); |
| else |
| IWL_DEBUG_RATE("leave - no station!\n"); |
| rcu_read_unlock(); |
| return sprintf(buf, "station %d not found\n", sta_id); |
| } |
| |
| lq_sta = (void *)sta->rate_ctrl_priv; |
| |
| lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type; |
| antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_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 = lq_sta->active_tbl; |
| |
| cnt += |
| sprintf(&buf[cnt], " %2dMbs: ", iwl_rates[i].ieee / 2); |
| |
| mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1)); |
| for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1) |
| buf[cnt++] = |
| (lq_sta->lq_info[active].win[i].data & mask) |
| ? '1' : '0'; |
| |
| samples += lq_sta->lq_info[active].win[i].counter; |
| good += lq_sta->lq_info[active].win[i].success_counter; |
| success += lq_sta->lq_info[active].win[i].success_counter * |
| iwl_rates[i].ieee; |
| |
| if (lq_sta->lq_info[active].win[i].stamp) { |
| int delta = |
| jiffies_to_msecs(now - |
| lq_sta->lq_info[active].win[i].stamp); |
| |
| if (delta > max_time) |
| max_time = delta; |
| |
| cnt += sprintf(&buf[cnt], "%5dms\n", delta); |
| } else |
| buf[cnt++] = '\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 iwl_rates is actually 2X the rate. |
| */ |
| if (samples) |
| cnt += sprintf(&buf[cnt], |
| "\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 |
| cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n"); |
| |
| cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d " |
| "active_search %d rate index %d\n", lq_type, antenna, |
| lq_sta->search_better_tbl, sta->last_txrate_idx); |
| |
| rcu_read_unlock(); |
| return cnt; |
| } |
| |
| void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) |
| { |
| struct iwl_priv *priv = hw->priv; |
| |
| priv->lq_mngr.lq_ready = 1; |
| } |
| |
| int iwl4965_rate_control_register(void) |
| { |
| return ieee80211_rate_control_register(&rs_ops); |
| } |
| |
| void iwl4965_rate_control_unregister(void) |
| { |
| ieee80211_rate_control_unregister(&rs_ops); |
| } |
| |