diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/mvm/rs.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/mvm/rs.c | 3096 |
1 files changed, 3096 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.c b/drivers/net/wireless/iwlwifi/mvm/rs.c new file mode 100644 index 000000000000..60a4291ca221 --- /dev/null +++ b/drivers/net/wireless/iwlwifi/mvm/rs.c @@ -0,0 +1,3096 @@ +/****************************************************************************** + * + * Copyright(c) 2005 - 2013 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: + * Intel Linux Wireless <ilw@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/slab.h> +#include <net/mac80211.h> + +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/delay.h> + +#include <linux/workqueue.h> +#include "rs.h" +#include "fw-api.h" +#include "sta.h" +#include "iwl-op-mode.h" +#include "mvm.h" + +#define RS_NAME "iwl-mvm-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 allowed rate miss before sync LQ cmd */ +#define IWL_MISSED_RATE_MAX 15 +/* max time to accum history 2 seconds */ +#define IWL_RATE_SCALE_FLUSH_INTVL (3*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, +}; + +#define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \ + [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ + IWL_RATE_SISO_##s##M_PLCP, \ + IWL_RATE_MIMO2_##s##M_PLCP,\ + IWL_RATE_MIMO3_##s##M_PLCP,\ + IWL_RATE_##r##M_IEEE, \ + IWL_RATE_##ip##M_INDEX, \ + IWL_RATE_##in##M_INDEX, \ + IWL_RATE_##rp##M_INDEX, \ + IWL_RATE_##rn##M_INDEX, \ + IWL_RATE_##pp##M_INDEX, \ + IWL_RATE_##np##M_INDEX } + +/* + * Parameter order: + * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate + * + * If there isn't a valid next or previous rate then INV is used which + * maps to IWL_RATE_INVALID + * + */ +static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { + IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */ + IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */ + IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */ + IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */ + IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */ + IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */ + IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */ + IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */ + IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */ + IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */ + IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */ + IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */ + IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */ + /* FIXME:RS: ^^ should be INV (legacy) */ +}; + +static inline u8 rs_extract_rate(u32 rate_n_flags) +{ + /* also works for HT because bits 7:6 are zero there */ + return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); +} + +static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) +{ + int idx = 0; + + /* HT rate format */ + if (rate_n_flags & RATE_MCS_HT_MSK) { + idx = rs_extract_rate(rate_n_flags); + + if (idx >= IWL_RATE_MIMO3_6M_PLCP) + idx = idx - IWL_RATE_MIMO3_6M_PLCP; + else if (idx >= IWL_RATE_MIMO2_6M_PLCP) + idx = idx - IWL_RATE_MIMO2_6M_PLCP; + + idx += IWL_FIRST_OFDM_RATE; + /* skip 9M not supported in ht*/ + if (idx >= IWL_RATE_9M_INDEX) + idx += 1; + if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE)) + return idx; + + /* legacy rate format, search for match in table */ + } else { + for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) + if (iwl_rates[idx].plcp == + rs_extract_rate(rate_n_flags)) + return idx; + } + + return -1; +} + +static void rs_rate_scale_perform(struct iwl_mvm *mvm, + struct sk_buff *skb, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta); +static void rs_fill_link_cmd(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, u32 rate_n_flags); +static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); + + +#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 + +/** + * The following tables contain the expected throughput metrics for all rates + * + * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits + * + * where invalid entries are zeros. + * + * CCK rates are only valid in legacy table and will only be used in G + * (2.4 GHz) band. + */ + +static s32 expected_tpt_legacy[IWL_RATE_COUNT] = { + 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0 +}; + +static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = { + {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */ + {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */ + {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */ + {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */ +}; + +static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = { + {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */ + {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */ + {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */ + {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */ +}; + +static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { + {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */ + {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */ + {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */ + {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/ +}; + +static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { + {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */ + {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */ + {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */ + {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */ +}; + +static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = { + {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */ + {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */ + {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */ + {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */ +}; + +static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = { + {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */ + {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */ + {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */ + {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */ +}; + +/* mbps, mcs */ +static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { + { "1", "BPSK DSSS"}, + { "2", "QPSK DSSS"}, + {"5.5", "BPSK CCK"}, + { "11", "QPSK CCK"}, + { "6", "BPSK 1/2"}, + { "9", "BPSK 1/2"}, + { "12", "QPSK 1/2"}, + { "18", "QPSK 3/4"}, + { "24", "16QAM 1/2"}, + { "36", "16QAM 3/4"}, + { "48", "64QAM 2/3"}, + { "54", "64QAM 3/4"}, + { "60", "64QAM 5/6"}, +}; + +#define MCS_INDEX_PER_STREAM (8) + +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; + u8 tid; + + if (ieee80211_is_data_qos(hdr->frame_control)) { + u8 *qc = ieee80211_get_qos_ctl(hdr); + tid = qc[0] & 0xf; + } else { + return IWL_MAX_TID_COUNT; + } + + if (unlikely(tid >= IWL_MAX_TID_COUNT)) + return IWL_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 IWL_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; +} + +#ifdef CONFIG_MAC80211_DEBUGFS +/** + * Program the device to use fixed rate for frame transmit + * This is for debugging/testing only + * once the device start use fixed rate, we need to reload the module + * to being back the normal operation. + */ +static void rs_program_fix_rate(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta) +{ + 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(mvm, "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_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false); + } +} +#endif + +/* + 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 >= IWL_MAX_TID_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 int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_data, u8 tid, + struct ieee80211_sta *sta) +{ + int ret = -EAGAIN; + u32 load; + + load = rs_tl_get_load(lq_data, tid); + + if ((iwlwifi_mod_params.auto_agg) || (load > IWL_AGG_LOAD_THRESHOLD)) { + IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", + sta->addr, tid); + ret = ieee80211_start_tx_ba_session(sta, tid, 5000); + if (ret == -EAGAIN) { + /* + * driver and mac80211 is out of sync + * this might be cause by reloading firmware + * stop the tx ba session here + */ + IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", + tid); + ieee80211_stop_tx_ba_session(sta, tid); + } + } else { + IWL_DEBUG_HT(mvm, + "Aggregation not enabled for tid %d because load = %u\n", + tid, load); + } + return ret; +} + +static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid, + struct iwl_lq_sta *lq_data, + struct ieee80211_sta *sta) +{ + if (tid < IWL_MAX_TID_COUNT) + rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta); + else + IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", + tid, IWL_MAX_TID_COUNT); +} + +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); +} + +/* + * Static function to get the expected throughput from an iwl_scale_tbl_info + * that wraps a NULL pointer check + */ +static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) +{ + if (tbl->expected_tpt) + return tbl->expected_tpt[rs_index]; + return 0; +} + +/** + * 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_scale_tbl_info *tbl, + int scale_index, int attempts, int successes) +{ + struct iwl_rate_scale_data *window = NULL; + static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); + s32 fail_count, tpt; + + if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) + return -EINVAL; + + /* Select window for current tx bit rate */ + window = &(tbl->win[scale_index]); + + /* Get expected throughput */ + tpt = get_expected_tpt(tbl, 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 (attempts > 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 to throw away oldest history */ + window->data <<= 1; + + /* Mark the most recent #successes attempts as successful */ + if (successes > 0) { + window->success_counter++; + window->data |= 0x1; + successes--; + } + + attempts--; + } + + /* 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_mvm *mvm, + 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_ERR(mvm, "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_ERR(mvm, "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_ht40) + rate_n_flags |= RATE_MCS_CHAN_WIDTH_40; + if (tbl->is_SGI) + rate_n_flags |= RATE_MCS_SGI_MSK; + + if (use_green) { + rate_n_flags |= RATE_HT_MCS_GF_MSK; + if (is_siso(tbl->lq_type) && tbl->is_SGI) { + rate_n_flags &= ~RATE_MCS_SGI_MSK; + IWL_ERR(mvm, "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; + + memset(tbl, 0, sizeof(struct iwl_scale_tbl_info)); + *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_ht40 = 0; + tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS); + tbl->lq_type = LQ_NONE; + tbl->max_search = IWL_MAX_SEARCH; + + /* 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_CHAN_WIDTH_40) /* TODO */ + tbl->is_ht40 = 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->max_search = IWL_MAX_11N_MIMO3_SEARCH; + 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; +} + +/** + * Green-field mode is valid if the station supports it and + * there are no non-GF stations present in the BSS. + */ +static bool rs_use_green(struct ieee80211_sta *sta) +{ + struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv; + + bool use_green = !(sta_priv->vif->bss_conf.ht_operation_mode & + IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT); + + return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) && use_green; +} + +/** + * 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 (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_mvm *mvm, 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(mvm, "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(mvm, "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; + struct iwl_mvm *mvm = lq_sta->drv; + + /* 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 = + first_antenna(mvm->nvm_data->valid_tx_ant); + + tbl->is_ht40 = 0; + tbl->is_SGI = 0; + tbl->max_search = IWL_MAX_SEARCH; + } + + 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(lq_sta->drv, tbl, low, is_green); +} + +/* + * Simple function to compare two rate scale table types + */ +static bool table_type_matches(struct iwl_scale_tbl_info *a, + struct iwl_scale_tbl_info *b) +{ + return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) && + (a->is_SGI == b->is_SGI); +} + +/* + * mac80211 sends us Tx status + */ +static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband, + struct ieee80211_sta *sta, void *priv_sta, + struct sk_buff *skb) +{ + int legacy_success; + int retries; + int rs_index, mac_index, i; + struct iwl_lq_sta *lq_sta = priv_sta; + struct iwl_lq_cmd *table; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; + struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + enum mac80211_rate_control_flags mac_flags; + u32 tx_rate; + struct iwl_scale_tbl_info tbl_type; + struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; + + IWL_DEBUG_RATE_LIMIT(mvm, + "get frame ack response, update rate scale window\n"); + + /* Treat uninitialized rate scaling data same as non-existing. */ + if (!lq_sta) { + IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); + return; + } else if (!lq_sta->drv) { + IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); + return; + } + + if (!ieee80211_is_data(hdr->frame_control) || + info->flags & IEEE80211_TX_CTL_NO_ACK) + return; + + /* This packet was aggregated but doesn't carry status info */ + if ((info->flags & IEEE80211_TX_CTL_AMPDU) && + !(info->flags & IEEE80211_TX_STAT_AMPDU)) + return; + + /* + * Ignore this Tx frame response if its initial rate doesn't match + * that of latest Link Quality command. There may be stragglers + * from a previous Link Quality command, but we're no longer interested + * in those; they're either from the "active" mode while we're trying + * to check "search" mode, or a prior "search" mode after we've moved + * to a new "search" mode (which might become the new "active" mode). + */ + table = &lq_sta->lq; + tx_rate = le32_to_cpu(table->rs_table[0]); + rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, &rs_index); + if (info->band == IEEE80211_BAND_5GHZ) + rs_index -= IWL_FIRST_OFDM_RATE; + mac_flags = info->status.rates[0].flags; + mac_index = info->status.rates[0].idx; + /* For HT packets, map MCS to PLCP */ + if (mac_flags & IEEE80211_TX_RC_MCS) { + /* Remove # of streams */ + mac_index &= RATE_HT_MCS_RATE_CODE_MSK; + if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE)) + mac_index++; + /* + * mac80211 HT index is always zero-indexed; we need to move + * HT OFDM rates after CCK rates in 2.4 GHz band + */ + if (info->band == IEEE80211_BAND_2GHZ) + mac_index += IWL_FIRST_OFDM_RATE; + } + /* Here we actually compare this rate to the latest LQ command */ + if ((mac_index < 0) || + (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) || + (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) || + (tbl_type.ant_type != info->status.antenna) || + (!!(tx_rate & RATE_MCS_HT_MSK) != + !!(mac_flags & IEEE80211_TX_RC_MCS)) || + (!!(tx_rate & RATE_HT_MCS_GF_MSK) != + !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) || + (rs_index != mac_index)) { + IWL_DEBUG_RATE(mvm, + "initial rate %d does not match %d (0x%x)\n", + mac_index, rs_index, tx_rate); + /* + * Since rates mis-match, the last LQ command may have failed. + * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with + * ... driver. + */ + lq_sta->missed_rate_counter++; + if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) { + lq_sta->missed_rate_counter = 0; + iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false); + } + /* Regardless, ignore this status info for outdated rate */ + return; + } else + /* Rate did match, so reset the missed_rate_counter */ + lq_sta->missed_rate_counter = 0; + + /* Figure out if rate scale algorithm is in active or search table */ + if (table_type_matches(&tbl_type, + &(lq_sta->lq_info[lq_sta->active_tbl]))) { + curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); + } else if (table_type_matches( + &tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) { + curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); + other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + } else { + IWL_DEBUG_RATE(mvm, + "Neither active nor search matches tx rate\n"); + tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + IWL_DEBUG_RATE(mvm, "active- lq:%x, ant:%x, SGI:%d\n", + tmp_tbl->lq_type, tmp_tbl->ant_type, + tmp_tbl->is_SGI); + tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); + IWL_DEBUG_RATE(mvm, "search- lq:%x, ant:%x, SGI:%d\n", + tmp_tbl->lq_type, tmp_tbl->ant_type, + tmp_tbl->is_SGI); + IWL_DEBUG_RATE(mvm, "actual- lq:%x, ant:%x, SGI:%d\n", + tbl_type.lq_type, tbl_type.ant_type, + tbl_type.is_SGI); + /* + * no matching table found, let's by-pass the data collection + * and continue to perform rate scale to find the rate table + */ + rs_stay_in_table(lq_sta, true); + goto done; + } + + /* + * Updating the frame history depends on whether packets were + * aggregated. + * + * For aggregation, all packets were transmitted at the same rate, the + * first index into rate scale table. + */ + if (info->flags & IEEE80211_TX_STAT_AMPDU) { + tx_rate = le32_to_cpu(table->rs_table[0]); + rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, + &rs_index); + rs_collect_tx_data(curr_tbl, rs_index, + info->status.ampdu_len, + info->status.ampdu_ack_len); + + /* Update success/fail counts if not searching for new mode */ + if (lq_sta->stay_in_tbl) { + lq_sta->total_success += info->status.ampdu_ack_len; + lq_sta->total_failed += (info->status.ampdu_len - + info->status.ampdu_ack_len); + } + } else { + /* + * For legacy, update frame history with for each Tx retry. + */ + retries = info->status.rates[0].count - 1; + /* HW doesn't send more than 15 retries */ + retries = min(retries, 15); + + /* The last transmission may have been successful */ + legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); + /* Collect data for each rate used during failed TX attempts */ + for (i = 0; i <= retries; ++i) { + tx_rate = le32_to_cpu(table->rs_table[i]); + rs_get_tbl_info_from_mcs(tx_rate, info->band, + &tbl_type, &rs_index); + /* + * Only collect stats if retried rate is in the same RS + * table as active/search. + */ + if (table_type_matches(&tbl_type, curr_tbl)) + tmp_tbl = curr_tbl; + else if (table_type_matches(&tbl_type, other_tbl)) + tmp_tbl = other_tbl; + else + continue; + rs_collect_tx_data(tmp_tbl, rs_index, 1, + i < retries ? 0 : legacy_success); + } + + /* Update success/fail counts if not searching for new mode */ + if (lq_sta->stay_in_tbl) { + lq_sta->total_success += legacy_success; + lq_sta->total_failed += retries + (1 - legacy_success); + } + } + /* The last TX rate is cached in lq_sta; it's set in if/else above */ + lq_sta->last_rate_n_flags = tx_rate; +done: + /* See if there's a better rate or modulation mode to try. */ + if (sta && sta->supp_rates[sband->band]) + rs_rate_scale_perform(mvm, skb, sta, lq_sta); +} + +/* + * 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_mvm *mvm, u8 is_legacy, + struct iwl_lq_sta *lq_sta) +{ + IWL_DEBUG_RATE(mvm, "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; + lq_sta->flush_timer = jiffies; + lq_sta->action_counter = 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) +{ + /* Used to choose among HT tables */ + s32 (*ht_tbl_pointer)[IWL_RATE_COUNT]; + + /* Check for invalid LQ type */ + if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) { + tbl->expected_tpt = expected_tpt_legacy; + return; + } + + /* Legacy rates have only one table */ + if (is_legacy(tbl->lq_type)) { + tbl->expected_tpt = expected_tpt_legacy; + return; + } + + /* Choose among many HT tables depending on number of streams + * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation + * status */ + if (is_siso(tbl->lq_type) && !tbl->is_ht40) + ht_tbl_pointer = expected_tpt_siso20MHz; + else if (is_siso(tbl->lq_type)) + ht_tbl_pointer = expected_tpt_siso40MHz; + else if (is_mimo2(tbl->lq_type) && !tbl->is_ht40) + ht_tbl_pointer = expected_tpt_mimo2_20MHz; + else if (is_mimo2(tbl->lq_type)) + ht_tbl_pointer = expected_tpt_mimo2_40MHz; + else if (is_mimo3(tbl->lq_type) && !tbl->is_ht40) + ht_tbl_pointer = expected_tpt_mimo3_20MHz; + else /* if (is_mimo3(tbl->lq_type)) <-- must be true */ + ht_tbl_pointer = expected_tpt_mimo3_40MHz; + + if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */ + tbl->expected_tpt = ht_tbl_pointer[0]; + else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */ + tbl->expected_tpt = ht_tbl_pointer[1]; + else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */ + tbl->expected_tpt = ht_tbl_pointer[2]; + else /* AGG+SGI */ + tbl->expected_tpt = ht_tbl_pointer[3]; +} + +/* + * 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_mvm *mvm, + 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; + + while (1) { + high_low = rs_get_adjacent_rate(mvm, 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; +} + +static bool iwl_is_ht40_tx_allowed(struct iwl_mvm *mvm, + struct ieee80211_sta_ht_cap *ht_cap) +{ + /* + * Remainder of this function checks ht_cap, but if it's + * NULL then we can do HT40 (special case for RXON) + */ + if (!ht_cap) + return true; + + if (!ht_cap->ht_supported) + return false; + + if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) + return false; + + return true; +} + +/* + * Set up search table for MIMO2 + */ +static int rs_switch_to_mimo2(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct ieee80211_sta *sta, + struct iwl_scale_tbl_info *tbl, int index) +{ + u16 rate_mask; + s32 rate; + s8 is_green = lq_sta->is_green; + + if (!sta->ht_cap.ht_supported) + return -1; + + if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2) + == WLAN_HT_CAP_SM_PS_STATIC) + return -1; + + /* Need both Tx chains/antennas to support MIMO */ + if (num_of_ant(mvm->nvm_data->valid_tx_ant) < 2) + return -1; + + IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n"); + + tbl->lq_type = LQ_MIMO2; + tbl->action = 0; + tbl->max_search = IWL_MAX_SEARCH; + rate_mask = lq_sta->active_mimo2_rate; + + if (iwl_is_ht40_tx_allowed(mvm, &sta->ht_cap)) + tbl->is_ht40 = 1; + else + tbl->is_ht40 = 0; + + rs_set_expected_tpt_table(lq_sta, tbl); + + rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index); + + IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n", + rate, rate_mask); + if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { + IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n", + rate, rate_mask); + return -1; + } + tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green); + + IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n", + tbl->current_rate, is_green); + return 0; +} + +/* + * Set up search table for MIMO3 + */ +static int rs_switch_to_mimo3(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct ieee80211_sta *sta, + struct iwl_scale_tbl_info *tbl, int index) +{ + u16 rate_mask; + s32 rate; + s8 is_green = lq_sta->is_green; + + if (!sta->ht_cap.ht_supported) + return -1; + + if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2) + == WLAN_HT_CAP_SM_PS_STATIC) + return -1; + + /* Need both Tx chains/antennas to support MIMO */ + if (num_of_ant(mvm->nvm_data->valid_tx_ant) < 3) + return -1; + + IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO3\n"); + + tbl->lq_type = LQ_MIMO3; + tbl->action = 0; + tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; + rate_mask = lq_sta->active_mimo3_rate; + + if (iwl_is_ht40_tx_allowed(mvm, &sta->ht_cap)) + tbl->is_ht40 = 1; + else + tbl->is_ht40 = 0; + + rs_set_expected_tpt_table(lq_sta, tbl); + + rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index); + + IWL_DEBUG_RATE(mvm, "LQ: MIMO3 best rate %d mask %X\n", + rate, rate_mask); + if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { + IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n", + rate, rate_mask); + return -1; + } + tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green); + + IWL_DEBUG_RATE(mvm, "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_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct ieee80211_sta *sta, + struct iwl_scale_tbl_info *tbl, int index) +{ + u16 rate_mask; + u8 is_green = lq_sta->is_green; + s32 rate; + + if (!sta->ht_cap.ht_supported) + return -1; + + IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n"); + + tbl->lq_type = LQ_SISO; + tbl->action = 0; + tbl->max_search = IWL_MAX_SEARCH; + rate_mask = lq_sta->active_siso_rate; + + if (iwl_is_ht40_tx_allowed(mvm, &sta->ht_cap)) + tbl->is_ht40 = 1; + else + tbl->is_ht40 = 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(mvm, lq_sta, tbl, rate_mask, index); + + IWL_DEBUG_RATE(mvm, "LQ: get best rate %d mask %X\n", rate, rate_mask); + if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { + IWL_DEBUG_RATE(mvm, + "can not switch with index %d rate mask %x\n", + rate, rate_mask); + return -1; + } + tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green); + IWL_DEBUG_RATE(mvm, "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_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct ieee80211_sta *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; + u8 valid_tx_ant = mvm->nvm_data->valid_tx_ant; + u8 tx_chains_num = num_of_ant(valid_tx_ant); + int ret; + u8 update_search_tbl_counter = 0; + + start_action = tbl->action; + while (1) { + lq_sta->action_counter++; + switch (tbl->action) { + case IWL_LEGACY_SWITCH_ANTENNA1: + case IWL_LEGACY_SWITCH_ANTENNA2: + IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n"); + + if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 && + tx_chains_num <= 1) || + (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 && + tx_chains_num <= 2)) + break; + + /* 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)) { + update_search_tbl_counter = 1; + rs_set_expected_tpt_table(lq_sta, search_tbl); + goto out; + } + break; + case IWL_LEGACY_SWITCH_SISO: + IWL_DEBUG_RATE(mvm, "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(mvm, lq_sta, sta, + search_tbl, index); + if (!ret) { + lq_sta->action_counter = 0; + goto out; + } + + break; + case IWL_LEGACY_SWITCH_MIMO2_AB: + case IWL_LEGACY_SWITCH_MIMO2_AC: + case IWL_LEGACY_SWITCH_MIMO2_BC: + IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n"); + + /* Set up search table to try MIMO */ + memcpy(search_tbl, tbl, sz); + search_tbl->is_SGI = 0; + + if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB) + search_tbl->ant_type = ANT_AB; + else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC) + search_tbl->ant_type = ANT_AC; + else + search_tbl->ant_type = ANT_BC; + + if (!rs_is_valid_ant(valid_tx_ant, + search_tbl->ant_type)) + break; + + ret = rs_switch_to_mimo2(mvm, lq_sta, sta, + search_tbl, index); + if (!ret) { + lq_sta->action_counter = 0; + goto out; + } + break; + + case IWL_LEGACY_SWITCH_MIMO3_ABC: + IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO3\n"); + + /* Set up search table to try MIMO3 */ + memcpy(search_tbl, tbl, sz); + search_tbl->is_SGI = 0; + + search_tbl->ant_type = ANT_ABC; + + if (!rs_is_valid_ant(valid_tx_ant, + search_tbl->ant_type)) + break; + + ret = rs_switch_to_mimo3(mvm, lq_sta, sta, + search_tbl, index); + if (!ret) { + lq_sta->action_counter = 0; + goto out; + } + break; + } + tbl->action++; + if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) + tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; + + if (tbl->action == start_action) + break; + } + search_tbl->lq_type = LQ_NONE; + return 0; + +out: + lq_sta->search_better_tbl = 1; + tbl->action++; + if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) + tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; + if (update_search_tbl_counter) + search_tbl->action = tbl->action; + return 0; +} + +/* + * Try to switch to new modulation mode from SISO + */ +static int rs_move_siso_to_other(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct ieee80211_sta *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]); + struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; + u32 sz = (sizeof(struct iwl_scale_tbl_info) - + (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); + u8 start_action; + u8 valid_tx_ant = mvm->nvm_data->valid_tx_ant; + u8 tx_chains_num = num_of_ant(valid_tx_ant); + u8 update_search_tbl_counter = 0; + int ret; + + start_action = tbl->action; + while (1) { + lq_sta->action_counter++; + switch (tbl->action) { + case IWL_SISO_SWITCH_ANTENNA1: + case IWL_SISO_SWITCH_ANTENNA2: + IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n"); + if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 && + tx_chains_num <= 1) || + (tbl->action == IWL_SISO_SWITCH_ANTENNA2 && + tx_chains_num <= 2)) + break; + + 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)) { + update_search_tbl_counter = 1; + goto out; + } + break; + case IWL_SISO_SWITCH_MIMO2_AB: + case IWL_SISO_SWITCH_MIMO2_AC: + case IWL_SISO_SWITCH_MIMO2_BC: + IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n"); + memcpy(search_tbl, tbl, sz); + search_tbl->is_SGI = 0; + + if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB) + search_tbl->ant_type = ANT_AB; + else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC) + search_tbl->ant_type = ANT_AC; + else + search_tbl->ant_type = ANT_BC; + + if (!rs_is_valid_ant(valid_tx_ant, + search_tbl->ant_type)) + break; + + ret = rs_switch_to_mimo2(mvm, lq_sta, sta, + search_tbl, index); + if (!ret) + goto out; + break; + case IWL_SISO_SWITCH_GI: + if (!tbl->is_ht40 && !(ht_cap->cap & + IEEE80211_HT_CAP_SGI_20)) + break; + if (tbl->is_ht40 && !(ht_cap->cap & + IEEE80211_HT_CAP_SGI_40)) + break; + + IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n"); + + memcpy(search_tbl, tbl, sz); + if (is_green) { + if (!tbl->is_SGI) + break; + else + IWL_ERR(mvm, + "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(mvm, search_tbl, + index, is_green); + update_search_tbl_counter = 1; + goto out; + case IWL_SISO_SWITCH_MIMO3_ABC: + IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO3\n"); + memcpy(search_tbl, tbl, sz); + search_tbl->is_SGI = 0; + search_tbl->ant_type = ANT_ABC; + + if (!rs_is_valid_ant(valid_tx_ant, + search_tbl->ant_type)) + break; + + ret = rs_switch_to_mimo3(mvm, lq_sta, sta, + search_tbl, index); + if (!ret) + goto out; + break; + } + tbl->action++; + if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) + tbl->action = IWL_SISO_SWITCH_ANTENNA1; + + if (tbl->action == start_action) + break; + } + search_tbl->lq_type = LQ_NONE; + return 0; + + out: + lq_sta->search_better_tbl = 1; + tbl->action++; + if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC) + tbl->action = IWL_SISO_SWITCH_ANTENNA1; + if (update_search_tbl_counter) + search_tbl->action = tbl->action; + + return 0; +} + +/* + * Try to switch to new modulation mode from MIMO2 + */ +static int rs_move_mimo2_to_other(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct ieee80211_sta *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)]); + struct iwl_rate_scale_data *window = &(tbl->win[index]); + struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; + u32 sz = (sizeof(struct iwl_scale_tbl_info) - + (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); + u8 start_action; + u8 valid_tx_ant = mvm->nvm_data->valid_tx_ant; + u8 tx_chains_num = num_of_ant(valid_tx_ant); + u8 update_search_tbl_counter = 0; + int ret; + + start_action = tbl->action; + while (1) { + lq_sta->action_counter++; + switch (tbl->action) { + case IWL_MIMO2_SWITCH_ANTENNA1: + case IWL_MIMO2_SWITCH_ANTENNA2: + IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle Antennas\n"); + + if (tx_chains_num <= 2) + break; + + 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)) { + update_search_tbl_counter = 1; + goto out; + } + break; + case IWL_MIMO2_SWITCH_SISO_A: + case IWL_MIMO2_SWITCH_SISO_B: + case IWL_MIMO2_SWITCH_SISO_C: + IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n"); + + /* Set up new search table for SISO */ + memcpy(search_tbl, tbl, sz); + + if (tbl->action == IWL_MIMO2_SWITCH_SISO_A) + search_tbl->ant_type = ANT_A; + else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B) + search_tbl->ant_type = ANT_B; + else + search_tbl->ant_type = ANT_C; + + if (!rs_is_valid_ant(valid_tx_ant, + search_tbl->ant_type)) + break; + + ret = rs_switch_to_siso(mvm, lq_sta, sta, + search_tbl, index); + if (!ret) + goto out; + + break; + + case IWL_MIMO2_SWITCH_GI: + if (!tbl->is_ht40 && !(ht_cap->cap & + IEEE80211_HT_CAP_SGI_20)) + break; + if (tbl->is_ht40 && !(ht_cap->cap & + IEEE80211_HT_CAP_SGI_40)) + break; + + IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n"); + + /* Set up new search table for MIMO2 */ + 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(mvm, search_tbl, + index, is_green); + update_search_tbl_counter = 1; + goto out; + + case IWL_MIMO2_SWITCH_MIMO3_ABC: + IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to MIMO3\n"); + memcpy(search_tbl, tbl, sz); + search_tbl->is_SGI = 0; + search_tbl->ant_type = ANT_ABC; + + if (!rs_is_valid_ant(valid_tx_ant, + search_tbl->ant_type)) + break; + + ret = rs_switch_to_mimo3(mvm, lq_sta, sta, + search_tbl, index); + if (!ret) + goto out; + + break; + } + tbl->action++; + if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) + tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; + + if (tbl->action == start_action) + break; + } + search_tbl->lq_type = LQ_NONE; + return 0; + out: + lq_sta->search_better_tbl = 1; + tbl->action++; + if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) + tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; + if (update_search_tbl_counter) + search_tbl->action = tbl->action; + + return 0; +} + +/* + * Try to switch to new modulation mode from MIMO3 + */ +static int rs_move_mimo3_to_other(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct ieee80211_sta *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)]); + struct iwl_rate_scale_data *window = &(tbl->win[index]); + struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; + u32 sz = (sizeof(struct iwl_scale_tbl_info) - + (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); + u8 start_action; + u8 valid_tx_ant = mvm->nvm_data->valid_tx_ant; + u8 tx_chains_num = num_of_ant(valid_tx_ant); + int ret; + u8 update_search_tbl_counter = 0; + + start_action = tbl->action; + while (1) { + lq_sta->action_counter++; + switch (tbl->action) { + case IWL_MIMO3_SWITCH_ANTENNA1: + case IWL_MIMO3_SWITCH_ANTENNA2: + IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle Antennas\n"); + + if (tx_chains_num <= 3) + break; + + 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)) + goto out; + break; + case IWL_MIMO3_SWITCH_SISO_A: + case IWL_MIMO3_SWITCH_SISO_B: + case IWL_MIMO3_SWITCH_SISO_C: + IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to SISO\n"); + + /* Set up new search table for SISO */ + memcpy(search_tbl, tbl, sz); + + if (tbl->action == IWL_MIMO3_SWITCH_SISO_A) + search_tbl->ant_type = ANT_A; + else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B) + search_tbl->ant_type = ANT_B; + else + search_tbl->ant_type = ANT_C; + + if (!rs_is_valid_ant(valid_tx_ant, + search_tbl->ant_type)) + break; + + ret = rs_switch_to_siso(mvm, lq_sta, sta, + search_tbl, index); + if (!ret) + goto out; + + break; + + case IWL_MIMO3_SWITCH_MIMO2_AB: + case IWL_MIMO3_SWITCH_MIMO2_AC: + case IWL_MIMO3_SWITCH_MIMO2_BC: + IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to MIMO2\n"); + + memcpy(search_tbl, tbl, sz); + search_tbl->is_SGI = 0; + if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB) + search_tbl->ant_type = ANT_AB; + else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC) + search_tbl->ant_type = ANT_AC; + else + search_tbl->ant_type = ANT_BC; + + if (!rs_is_valid_ant(valid_tx_ant, + search_tbl->ant_type)) + break; + + ret = rs_switch_to_mimo2(mvm, lq_sta, sta, + search_tbl, index); + if (!ret) + goto out; + + break; + + case IWL_MIMO3_SWITCH_GI: + if (!tbl->is_ht40 && !(ht_cap->cap & + IEEE80211_HT_CAP_SGI_20)) + break; + if (tbl->is_ht40 && !(ht_cap->cap & + IEEE80211_HT_CAP_SGI_40)) + break; + + IWL_DEBUG_RATE(mvm, "LQ: MIMO3 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(mvm, search_tbl, + index, is_green); + update_search_tbl_counter = 1; + goto out; + } + tbl->action++; + if (tbl->action > IWL_MIMO3_SWITCH_GI) + tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; + + if (tbl->action == start_action) + break; + } + search_tbl->lq_type = LQ_NONE; + return 0; + out: + lq_sta->search_better_tbl = 1; + tbl->action++; + if (tbl->action > IWL_MIMO3_SWITCH_GI) + tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; + if (update_search_tbl_counter) + search_tbl->action = tbl->action; + + 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, bool force_search) +{ + struct iwl_scale_tbl_info *tbl; + int i; + int active_tbl; + int flush_interval_passed = 0; + struct iwl_mvm *mvm; + + mvm = 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 (force_search || + (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(mvm, + "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(mvm, + "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])); + } + } +} + +/* + * setup rate table in uCode + */ +static void rs_update_rate_tbl(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct iwl_scale_tbl_info *tbl, + int index, u8 is_green) +{ + u32 rate; + + /* Update uCode's rate table. */ + rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green); + rs_fill_link_cmd(mvm, lq_sta, rate); + iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false); +} + +/* + * Do rate scaling and search for new modulation mode. + */ +static void rs_rate_scale_perform(struct iwl_mvm *mvm, + struct sk_buff *skb, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta) +{ + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + int low = IWL_RATE_INVALID; + int high = IWL_RATE_INVALID; + int index; + int i; + struct iwl_rate_scale_data *window = NULL; + int current_tpt = IWL_INVALID_VALUE; + int low_tpt = IWL_INVALID_VALUE; + int high_tpt = IWL_INVALID_VALUE; + u32 fail_count; + s8 scale_action = 0; + u16 rate_mask; + u8 update_lq = 0; + struct iwl_scale_tbl_info *tbl, *tbl1; + u16 rate_scale_index_msk = 0; + u8 is_green = 0; + u8 active_tbl = 0; + u8 done_search = 0; + u16 high_low; + s32 sr; + u8 tid = IWL_MAX_TID_COUNT; + struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv; + struct iwl_mvm_tid_data *tid_data; + + IWL_DEBUG_RATE(mvm, "rate scale calculate new rate for skb\n"); + + /* Send management frames and NO_ACK data using lowest rate. */ + /* TODO: this could probably be improved.. */ + if (!ieee80211_is_data(hdr->frame_control) || + info->flags & IEEE80211_TX_CTL_NO_ACK) + return; + + lq_sta->supp_rates = sta->supp_rates[lq_sta->band]; + + tid = rs_tl_add_packet(lq_sta, hdr); + if ((tid != IWL_MAX_TID_COUNT) && + (lq_sta->tx_agg_tid_en & (1 << tid))) { + tid_data = &sta_priv->tid_data[tid]; + if (tid_data->state == IWL_AGG_OFF) + lq_sta->is_agg = 0; + else + lq_sta->is_agg = 1; + } else { + lq_sta->is_agg = 0; + } + + /* + * 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]); + if (is_legacy(tbl->lq_type)) + lq_sta->is_green = 0; + else + lq_sta->is_green = rs_use_green(sta); + is_green = lq_sta->is_green; + + /* current tx rate */ + index = lq_sta->last_txrate_idx; + + IWL_DEBUG_RATE(mvm, "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(mvm, "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_ERR(mvm, "Current Rate is not valid\n"); + if (lq_sta->search_better_tbl) { + /* revert to active table if search table is not valid*/ + tbl->lq_type = LQ_NONE; + lq_sta->search_better_tbl = 0; + tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + /* get "active" rate info */ + index = iwl_hwrate_to_plcp_idx(tbl->current_rate); + rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green); + } + return; + } + + /* Get expected throughput table and history window for current rate */ + if (!tbl->expected_tpt) { + IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); + return; + } + + /* force user max rate if set by user */ + if ((lq_sta->max_rate_idx != -1) && + (lq_sta->max_rate_idx < index)) { + index = lq_sta->max_rate_idx; + update_lq = 1; + window = &(tbl->win[index]); + goto lq_update; + } + + 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(mvm, + "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, false); + + goto out; + } + /* Else we have enough samples; calculate estimate of + * actual average throughput */ + if (window->average_tpt != ((window->success_ratio * + tbl->expected_tpt[index] + 64) / 128)) { + IWL_ERR(mvm, + "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(mvm, + "LQ: SWITCHING TO NEW 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(mvm, + "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(mvm, index, rate_scale_index_msk, + tbl->lq_type); + low = high_low & 0xff; + high = (high_low >> 8) & 0xff; + + /* If user set max rate, dont allow higher than user constrain */ + if ((lq_sta->max_rate_idx != -1) && + (lq_sta->max_rate_idx < high)) + high = IWL_RATE_INVALID; + + 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(mvm, + "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 = 0; + } + + /* 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 { + scale_action = 0; + } + + /* 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(mvm, + "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(mvm, + "choose rate scale index %d action %d low %d high %d type %d\n", + index, scale_action, low, high, tbl->lq_type); + +lq_update: + /* Replace uCode's rate table for the destination station. */ + if (update_lq) + rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green); + + rs_stay_in_table(lq_sta, false); + + /* + * 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(mvm, lq_sta, sta, index); + else if (is_siso(tbl->lq_type)) + rs_move_siso_to_other(mvm, lq_sta, sta, index); + else if (is_mimo2(tbl->lq_type)) + rs_move_mimo2_to_other(mvm, lq_sta, sta, index); + else + rs_move_mimo3_to_other(mvm, lq_sta, 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(mvm, + "Switch current mcs: %X index: %d\n", + tbl->current_rate, index); + rs_fill_link_cmd(mvm, lq_sta, tbl->current_rate); + iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false); + } else { + done_search = 1; + } + } + + if (done_search && !lq_sta->stay_in_tbl) { + /* 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) && !sta->ht_cap.ht_supported && + lq_sta->action_counter > tbl1->max_search) { + IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n"); + rs_set_stay_in_table(mvm, 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 >= tbl1->max_search)) { + if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && + (lq_sta->tx_agg_tid_en & (1 << tid)) && + (tid != IWL_MAX_TID_COUNT)) { + tid_data = &sta_priv->tid_data[tid]; + if (tid_data->state == IWL_AGG_OFF) { + IWL_DEBUG_RATE(mvm, + "try to aggregate tid %d\n", + tid); + rs_tl_turn_on_agg(mvm, tid, + lq_sta, sta); + } + } + rs_set_stay_in_table(mvm, 0, lq_sta); + } + } + +out: + tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green); + lq_sta->last_txrate_idx = index; +} + +/** + * rs_initialize_lq - Initialize a station's hardware rate table + * + * The uCode's station table contains a table of fallback rates + * for automatic fallback during transmission. + * + * NOTE: This sets up a default set of values. These will be replaced later + * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of + * rc80211_simple. + * + * NOTE: Run REPLY_ADD_STA command to set up station table entry, before + * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, + * which requires station table entry to exist). + */ +static void rs_initialize_lq(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + enum ieee80211_band band) +{ + struct iwl_scale_tbl_info *tbl; + int rate_idx; + int i; + u32 rate; + u8 use_green = rs_use_green(sta); + u8 active_tbl = 0; + u8 valid_tx_ant; + + if (!sta || !lq_sta) + return; + + i = lq_sta->last_txrate_idx; + + valid_tx_ant = mvm->nvm_data->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; + + rate = iwl_rates[i].plcp; + tbl->ant_type = first_antenna(valid_tx_ant); + rate |= tbl->ant_type << RATE_MCS_ANT_POS; + + if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE) + rate |= RATE_MCS_CCK_MSK; + + rs_get_tbl_info_from_mcs(rate, 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(mvm, 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); + /* TODO restore station should remember the lq cmd */ + iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_SYNC, true); +} + +static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, + struct ieee80211_tx_rate_control *txrc) +{ + struct sk_buff *skb = txrc->skb; + struct ieee80211_supported_band *sband = txrc->sband; + struct iwl_op_mode *op_mode __maybe_unused = + (struct iwl_op_mode *)mvm_r; + struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct iwl_lq_sta *lq_sta = mvm_sta; + int rate_idx; + + IWL_DEBUG_RATE_LIMIT(mvm, "rate scale calculate new rate for skb\n"); + + /* Get max rate if user set max rate */ + if (lq_sta) { + lq_sta->max_rate_idx = txrc->max_rate_idx; + if ((sband->band == IEEE80211_BAND_5GHZ) && + (lq_sta->max_rate_idx != -1)) + lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE; + if ((lq_sta->max_rate_idx < 0) || + (lq_sta->max_rate_idx >= IWL_RATE_COUNT)) + lq_sta->max_rate_idx = -1; + } + + /* Treat uninitialized rate scaling data same as non-existing. */ + if (lq_sta && !lq_sta->drv) { + IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); + mvm_sta = NULL; + } + + /* Send management frames and NO_ACK data using lowest rate. */ + if (rate_control_send_low(sta, mvm_sta, txrc)) + return; + + rate_idx = lq_sta->last_txrate_idx; + + if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) { + rate_idx -= IWL_FIRST_OFDM_RATE; + /* 6M and 9M shared same MCS index */ + rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0; + if (rs_extract_rate(lq_sta->last_rate_n_flags) >= + IWL_RATE_MIMO3_6M_PLCP) + rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM); + else if (rs_extract_rate(lq_sta->last_rate_n_flags) >= + IWL_RATE_MIMO2_6M_PLCP) + rate_idx = rate_idx + MCS_INDEX_PER_STREAM; + info->control.rates[0].flags = IEEE80211_TX_RC_MCS; + if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK) + info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI; + if (lq_sta->last_rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */ + info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; + if (lq_sta->last_rate_n_flags & RATE_HT_MCS_GF_MSK) + info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD; + } else { + /* Check for invalid rates */ + if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) || + ((sband->band == IEEE80211_BAND_5GHZ) && + (rate_idx < IWL_FIRST_OFDM_RATE))) + rate_idx = rate_lowest_index(sband, sta); + /* On valid 5 GHz rate, adjust index */ + else if (sband->band == IEEE80211_BAND_5GHZ) + rate_idx -= IWL_FIRST_OFDM_RATE; + info->control.rates[0].flags = 0; + } + info->control.rates[0].idx = rate_idx; +} + +static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, + gfp_t gfp) +{ + struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv; + struct iwl_op_mode *op_mode __maybe_unused = + (struct iwl_op_mode *)mvm_rate; + struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); + + IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); + + return &sta_priv->lq_sta; +} + +/* + * Called after adding a new station to initialize rate scaling + */ +void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, + enum ieee80211_band band) +{ + int i, j; + struct ieee80211_hw *hw = mvm->hw; + struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; + struct iwl_mvm_sta *sta_priv; + struct iwl_lq_sta *lq_sta; + struct ieee80211_supported_band *sband; + unsigned long supp; /* must be unsigned long for for_each_set_bit */ + + sta_priv = (struct iwl_mvm_sta *)sta->drv_priv; + lq_sta = &sta_priv->lq_sta; + sband = hw->wiphy->bands[band]; + + lq_sta->lq.sta_id = sta_priv->sta_id; + + 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]); + + lq_sta->flush_timer = 0; + lq_sta->supp_rates = sta->supp_rates[sband->band]; + 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(mvm, + "LQ: *** rate scale station global init for station %d ***\n", + sta_priv->sta_id); + /* 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->max_rate_idx = -1; + lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX; + lq_sta->is_green = rs_use_green(sta); + lq_sta->band = sband->band; + /* + * active legacy rates as per supported rates bitmap + */ + supp = sta->supp_rates[sband->band]; + lq_sta->active_legacy_rate = 0; + for_each_set_bit(i, &supp, BITS_PER_LONG) + lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); + + /* + * 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 = ht_cap->mcs.rx_mask[0] << 1; + lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[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 = ht_cap->mcs.rx_mask[1] << 1; + lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; + lq_sta->active_mimo2_rate &= ~((u16)0x2); + lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; + + lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1; + lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1; + lq_sta->active_mimo3_rate &= ~((u16)0x2); + lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE; + + IWL_DEBUG_RATE(mvm, + "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 overridden later */ + lq_sta->lq.single_stream_ant_msk = + first_antenna(mvm->nvm_data->valid_tx_ant); + lq_sta->lq.dual_stream_ant_msk = + mvm->nvm_data->valid_tx_ant & + ~first_antenna(mvm->nvm_data->valid_tx_ant); + if (!lq_sta->lq.dual_stream_ant_msk) { + lq_sta->lq.dual_stream_ant_msk = ANT_AB; + } else if (num_of_ant(mvm->nvm_data->valid_tx_ant) == 2) { + lq_sta->lq.dual_stream_ant_msk = + mvm->nvm_data->valid_tx_ant; + } + + /* as default allow aggregation for all tids */ + lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; + lq_sta->drv = mvm; + + /* Set last_txrate_idx to lowest rate */ + lq_sta->last_txrate_idx = rate_lowest_index(sband, sta); + if (sband->band == IEEE80211_BAND_5GHZ) + lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; + lq_sta->is_agg = 0; +#ifdef CONFIG_MAC80211_DEBUGFS + lq_sta->dbg_fixed_rate = 0; +#endif + + rs_initialize_lq(mvm, sta, lq_sta, band); +} + +static void rs_fill_link_cmd(struct iwl_mvm *mvm, + 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_lq_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) */ + 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 = min(IWL_HT_NUMBER_TRY, + LINK_QUAL_AGG_DISABLE_START_DEF - 1); + } + + lq_cmd->mimo_delim = is_mimo(tbl_type.lq_type) ? 1 : 0; + + /* Fill 1st table entry (index 0) */ + lq_cmd->rs_table[index] = cpu_to_le32(new_rate); + + if (num_of_ant(tbl_type.ant_type) == 1) + lq_cmd->single_stream_ant_msk = tbl_type.ant_type; + else if (num_of_ant(tbl_type.ant_type) == 2) + lq_cmd->dual_stream_ant_msk = tbl_type.ant_type; + /* otherwise we don't modify the existing value */ + + index++; + repeat_rate--; + if (mvm) + valid_tx_ant = mvm->nvm_data->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 (mvm && + 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] = + 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->mimo_delim = 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 (mvm && + 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] = cpu_to_le32(new_rate); + + index++; + repeat_rate--; + } + + lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; + lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF; + + lq_cmd->agg_time_limit = + cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF); +} + +static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) +{ + return hw->priv; +} +/* rate scale requires free function to be implemented */ +static void rs_free(void *mvm_rate) +{ + return; +} + +static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, + void *mvm_sta) +{ + struct iwl_op_mode *op_mode __maybe_unused = mvm_r; + struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); + + IWL_DEBUG_RATE(mvm, "enter\n"); + IWL_DEBUG_RATE(mvm, "leave\n"); +} + +#ifdef CONFIG_MAC80211_DEBUGFS +static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, + u32 *rate_n_flags, int index) +{ + struct iwl_mvm *mvm; + u8 valid_tx_ant; + u8 ant_sel_tx; + + mvm = lq_sta->drv; + valid_tx_ant = mvm->nvm_data->valid_tx_ant; + if (lq_sta->dbg_fixed_rate) { + ant_sel_tx = + ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) + >> RATE_MCS_ANT_POS); + if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) { + *rate_n_flags = lq_sta->dbg_fixed_rate; + IWL_DEBUG_RATE(mvm, "Fixed rate ON\n"); + } else { + lq_sta->dbg_fixed_rate = 0; + IWL_ERR(mvm, + "Invalid antenna selection 0x%X, Valid is 0x%X\n", + ant_sel_tx, valid_tx_ant); + IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n"); + } + } else { + IWL_DEBUG_RATE(mvm, "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_mvm *mvm; + char buf[64]; + size_t buf_size; + u32 parsed_rate; + + + mvm = 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; + + rs_program_fix_rate(mvm, lq_sta); + + 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; + int desc = 0; + int i = 0; + int index = 0; + ssize_t ret; + + struct iwl_lq_sta *lq_sta = file->private_data; + struct iwl_mvm *mvm; + struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + + mvm = lq_sta->drv; + buff = kmalloc(1024, GFP_KERNEL); + if (!buff) + return -ENOMEM; + + 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, "valid_tx_ant %s%s%s\n", + (mvm->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "", + (mvm->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "", + (mvm->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : ""); + desc += sprintf(buff+desc, "lq type %s\n", + (is_legacy(tbl->lq_type)) ? "legacy" : "HT"); + if (is_Ht(tbl->lq_type)) { + desc += sprintf(buff+desc, " %s", + (is_siso(tbl->lq_type)) ? "SISO" : + ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3")); + desc += sprintf(buff+desc, " %s", + (tbl->is_ht40) ? "40MHz" : "20MHz"); + desc += sprintf(buff+desc, " %s %s %s\n", + (tbl->is_SGI) ? "SGI" : "", + (lq_sta->is_green) ? "GF enabled" : "", + (lq_sta->is_agg) ? "AGG on" : ""); + } + desc += sprintf(buff+desc, "last tx rate=0x%X\n", + lq_sta->last_rate_n_flags); + desc += sprintf(buff+desc, + "general: flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n", + lq_sta->lq.flags, + lq_sta->lq.mimo_delim, + lq_sta->lq.single_stream_ant_msk, + lq_sta->lq.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_time_limit), + lq_sta->lq.agg_disable_start_th, + lq_sta->lq.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.initial_rate_index[0], + lq_sta->lq.initial_rate_index[1], + lq_sta->lq.initial_rate_index[2], + lq_sta->lq.initial_rate_index[3]); + + for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { + index = iwl_hwrate_to_plcp_idx( + le32_to_cpu(lq_sta->lq.rs_table[i])); + if (is_legacy(tbl->lq_type)) { + desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n", + i, le32_to_cpu(lq_sta->lq.rs_table[i]), + iwl_rate_mcs[index].mbps); + } else { + desc += sprintf(buff+desc, + " rate[%d] 0x%X %smbps (%s)\n", + i, le32_to_cpu(lq_sta->lq.rs_table[i]), + iwl_rate_mcs[index].mbps, + iwl_rate_mcs[index].mcs); + } + } + + ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); + kfree(buff); + return ret; +} + +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 = simple_open, + .llseek = default_llseek, +}; +static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, + char __user *user_buf, size_t count, loff_t *ppos) +{ + char *buff; + int desc = 0; + int i, j; + ssize_t ret; + + struct iwl_lq_sta *lq_sta = file->private_data; + + buff = kmalloc(1024, GFP_KERNEL); + if (!buff) + return -ENOMEM; + + for (i = 0; i < LQ_SIZE; i++) { + desc += sprintf(buff+desc, + "%s type=%d SGI=%d HT40=%d DUP=0 GF=%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_ht40, + lq_sta->is_green, + 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); + } + } + ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); + kfree(buff); + return ret; +} + +static const struct file_operations rs_sta_dbgfs_stats_table_ops = { + .read = rs_sta_dbgfs_stats_table_read, + .open = simple_open, + .llseek = default_llseek, +}; + +static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file, + char __user *user_buf, size_t count, loff_t *ppos) +{ + struct iwl_lq_sta *lq_sta = file->private_data; + struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; + char buff[120]; + int desc = 0; + + if (is_Ht(tbl->lq_type)) + desc += sprintf(buff+desc, + "Bit Rate= %d Mb/s\n", + tbl->expected_tpt[lq_sta->last_txrate_idx]); + else + desc += sprintf(buff+desc, + "Bit Rate= %d Mb/s\n", + iwl_rates[lq_sta->last_txrate_idx].ieee >> 1); + + return simple_read_from_buffer(user_buf, count, ppos, buff, desc); +} + +static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = { + .read = rs_sta_dbgfs_rate_scale_data_read, + .open = simple_open, + .llseek = default_llseek, +}; + +static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir) +{ + struct iwl_lq_sta *lq_sta = mvm_sta; + lq_sta->rs_sta_dbgfs_scale_table_file = + debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, + lq_sta, &rs_sta_dbgfs_scale_table_ops); + lq_sta->rs_sta_dbgfs_stats_table_file = + debugfs_create_file("rate_stats_table", S_IRUSR, dir, + lq_sta, &rs_sta_dbgfs_stats_table_ops); + lq_sta->rs_sta_dbgfs_rate_scale_data_file = + debugfs_create_file("rate_scale_data", S_IRUSR, dir, + lq_sta, &rs_sta_dbgfs_rate_scale_data_ops); + lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file = + debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, + &lq_sta->tx_agg_tid_en); +} + +static void rs_remove_debugfs(void *mvm, void *mvm_sta) +{ + struct iwl_lq_sta *lq_sta = mvm_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_rate_scale_data_file); + debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file); +} +#endif + +/* + * Initialization of rate scaling information is done by driver after + * the station is added. Since mac80211 calls this function before a + * station is added we ignore it. + */ +static void rs_rate_init_stub(void *mvm_r, + struct ieee80211_supported_band *sband, + struct ieee80211_sta *sta, void *mvm_sta) +{ +} +static struct rate_control_ops rs_mvm_ops = { + .module = NULL, + .name = RS_NAME, + .tx_status = rs_tx_status, + .get_rate = rs_get_rate, + .rate_init = rs_rate_init_stub, + .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 iwl_mvm_rate_control_register(void) +{ + return ieee80211_rate_control_register(&rs_mvm_ops); +} + +void iwl_mvm_rate_control_unregister(void) +{ + ieee80211_rate_control_unregister(&rs_mvm_ops); +} |