| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Wey-Yi Guy | 10984 | 86.89% | 9 | 9.68% |
| Stanislaw Gruszka | 970 | 7.67% | 19 | 20.43% |
| Tomas Winkler | 304 | 2.40% | 15 | 16.13% |
| Johannes Berg | 127 | 1.00% | 17 | 18.28% |
| Yi Zhu | 78 | 0.62% | 2 | 2.15% |
| Ron Rindjunsky | 30 | 0.24% | 4 | 4.30% |
| Reinette Chatre | 22 | 0.17% | 3 | 3.23% |
| Sriram R | 22 | 0.17% | 1 | 1.08% |
| Emmanuel Grumbach | 19 | 0.15% | 2 | 2.15% |
| Mohamed Abbas | 16 | 0.13% | 1 | 1.08% |
| Greg Dietsche | 12 | 0.09% | 5 | 5.38% |
| Colin Ian King | 9 | 0.07% | 1 | 1.08% |
| Stanislaw W. Gruszka | 8 | 0.06% | 1 | 1.08% |
| Gregory Greenman | 7 | 0.06% | 1 | 1.08% |
| Simon Wunderlich | 5 | 0.04% | 1 | 1.08% |
| Daniel C. Halperin | 5 | 0.04% | 2 | 2.15% |
| Lee Jones | 5 | 0.04% | 1 | 1.08% |
| Joe Perches | 4 | 0.03% | 1 | 1.08% |
| Stephen Boyd | 4 | 0.03% | 2 | 2.15% |
| Karl Beldan | 3 | 0.02% | 1 | 1.08% |
| Thomas Gleixner | 2 | 0.02% | 1 | 1.08% |
| Benjamin Berg | 2 | 0.02% | 1 | 1.08% |
| Christoph Hellwig | 2 | 0.02% | 1 | 1.08% |
| Geert Uytterhoeven | 1 | 0.01% | 1 | 1.08% |
| Total | 12641 | 93 |
// SPDX-License-Identifier: GPL-2.0-only /****************************************************************************** * * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved. * * 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/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 "common.h" #include "4965.h" #define IL4965_RS_NAME "iwl-4965-rs" #define NUM_TRY_BEFORE_ANT_TOGGLE 1 #define IL_NUMBER_TRY 1 #define IL_HT_NUMBER_TRY 3 #define RATE_MAX_WINDOW 62 /* # tx in history win */ #define RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */ #define RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */ /* max allowed rate miss before sync LQ cmd */ #define IL_MISSED_RATE_MAX 15 /* max time to accum history 2 seconds */ #define RATE_SCALE_FLUSH_INTVL (3*HZ) static u8 rs_ht_to_legacy[] = { RATE_6M_IDX, RATE_6M_IDX, RATE_6M_IDX, RATE_6M_IDX, RATE_6M_IDX, RATE_6M_IDX, RATE_9M_IDX, RATE_12M_IDX, RATE_18M_IDX, RATE_24M_IDX, RATE_36M_IDX, RATE_48M_IDX, RATE_54M_IDX }; 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 IL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \ [RATE_##r##M_IDX] = { RATE_##r##M_PLCP, \ RATE_SISO_##s##M_PLCP, \ RATE_MIMO2_##s##M_PLCP,\ RATE_##r##M_IEEE, \ RATE_##ip##M_IDX, \ RATE_##in##M_IDX, \ RATE_##rp##M_IDX, \ RATE_##rn##M_IDX, \ RATE_##pp##M_IDX, \ RATE_##np##M_IDX } /* * 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 RATE_INVALID * */ const struct il_rate_info il_rates[RATE_COUNT] = { IL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */ IL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */ IL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */ IL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */ IL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */ IL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */ IL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */ IL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */ IL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */ IL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */ IL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */ IL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */ IL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */ }; static int il4965_hwrate_to_plcp_idx(u32 rate_n_flags) { int idx = 0; /* HT rate format */ if (rate_n_flags & RATE_MCS_HT_MSK) { idx = (rate_n_flags & 0xff); if (idx >= RATE_MIMO2_6M_PLCP) idx = idx - RATE_MIMO2_6M_PLCP; idx += IL_FIRST_OFDM_RATE; /* skip 9M not supported in ht */ if (idx >= RATE_9M_IDX) idx += 1; if (idx >= IL_FIRST_OFDM_RATE && idx <= IL_LAST_OFDM_RATE) return idx; /* legacy rate format, search for match in table */ } else { for (idx = 0; idx < ARRAY_SIZE(il_rates); idx++) if (il_rates[idx].plcp == (rate_n_flags & 0xFF)) return idx; } return -1; } static void il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb, struct ieee80211_sta *sta, struct il_lq_sta *lq_sta); static void il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta, u32 rate_n_flags); static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search); #ifdef CONFIG_MAC80211_DEBUGFS static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 *rate_n_flags, int idx); #else static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx) { } #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[RATE_COUNT] = { 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0 }; static s32 expected_tpt_siso20MHz[4][RATE_COUNT] = { {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */ {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */ {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */ {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */ }; static s32 expected_tpt_siso40MHz[4][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, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */ {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */ }; static s32 expected_tpt_mimo2_20MHz[4][RATE_COUNT] = { {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */ {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */ {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */ {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI */ }; static s32 expected_tpt_mimo2_40MHz[4][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, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */ {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */ }; /* mbps, mcs */ static const struct il_rate_mcs_info il_rate_mcs[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_IDX_PER_STREAM (8) static inline u8 il4965_rs_extract_rate(u32 rate_n_flags) { return (u8) (rate_n_flags & 0xFF); } static void il4965_rs_rate_scale_clear_win(struct il_rate_scale_data *win) { win->data = 0; win->success_counter = 0; win->success_ratio = IL_INVALID_VALUE; win->counter = 0; win->average_tpt = IL_INVALID_VALUE; win->stamp = 0; } static inline u8 il4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type) { return (ant_type & valid_antenna) == ant_type; } /* * removes the old data from the stats. All data that is older than * TID_MAX_TIME_DIFF, will be deleted. */ static void il4965_rs_tl_rm_old_stats(struct il_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 il4965_rs_tl_add_packet(struct il_lq_sta *lq_data, struct ieee80211_hdr *hdr) { u32 curr_time = jiffies_to_msecs(jiffies); u32 time_diff; s32 idx; struct il_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 MAX_TID_COUNT; if (unlikely(tid >= TID_MAX_LOAD_COUNT)) return MAX_TID_COUNT; tl = &lq_data->load[tid]; curr_time -= curr_time % TID_ROUND_VALUE; /* Happens only for the first packet. Initialize the data */ if (!(tl->queue_count)) { tl->total = 1; tl->time_stamp = curr_time; tl->queue_count = 1; tl->head = 0; tl->packet_count[0] = 1; return MAX_TID_COUNT; } time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); idx = time_diff / TID_QUEUE_CELL_SPACING; /* The history is too long: remove data that is older than */ /* TID_MAX_TIME_DIFF */ if (idx >= TID_QUEUE_MAX_SIZE) il4965_rs_tl_rm_old_stats(tl, curr_time); idx = (tl->head + idx) % TID_QUEUE_MAX_SIZE; tl->packet_count[idx] = tl->packet_count[idx] + 1; tl->total = tl->total + 1; if ((idx + 1) > tl->queue_count) tl->queue_count = idx + 1; return tid; } /* get the traffic load value for tid */ static u32 il4965_rs_tl_get_load(struct il_lq_sta *lq_data, u8 tid) { u32 curr_time = jiffies_to_msecs(jiffies); u32 time_diff; s32 idx; struct il_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); idx = time_diff / TID_QUEUE_CELL_SPACING; /* The history is too long: remove data that is older than */ /* TID_MAX_TIME_DIFF */ if (idx >= TID_QUEUE_MAX_SIZE) il4965_rs_tl_rm_old_stats(tl, curr_time); return tl->total; } static int il4965_rs_tl_turn_on_agg_for_tid(struct il_priv *il, struct il_lq_sta *lq_data, u8 tid, struct ieee80211_sta *sta) { int ret = -EAGAIN; u32 load; load = il4965_rs_tl_get_load(lq_data, tid); if (load > IL_AGG_LOAD_THRESHOLD) { D_HT("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 */ IL_ERR("Fail start Tx agg on tid: %d\n", tid); ieee80211_stop_tx_ba_session(sta, tid); } } else D_HT("Aggregation not enabled for tid %d because load = %u\n", tid, load); return ret; } static void il4965_rs_tl_turn_on_agg(struct il_priv *il, u8 tid, struct il_lq_sta *lq_data, struct ieee80211_sta *sta) { if (tid < TID_MAX_LOAD_COUNT) il4965_rs_tl_turn_on_agg_for_tid(il, lq_data, tid, sta); else IL_ERR("tid exceeds max load count: %d/%d\n", tid, TID_MAX_LOAD_COUNT); } static inline int il4965_get_il4965_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 il_scale_tbl_info * that wraps a NULL pointer check */ static s32 il4965_get_expected_tpt(struct il_scale_tbl_info *tbl, int rs_idx) { if (tbl->expected_tpt) return tbl->expected_tpt[rs_idx]; return 0; } /* * il4965_rs_collect_tx_data - Update the success/failure sliding win * * We keep a sliding win of the last 62 packets transmitted * at this rate. win->data contains the bitmask of successful * packets. */ static int il4965_rs_collect_tx_data(struct il_scale_tbl_info *tbl, int scale_idx, int attempts, int successes) { struct il_rate_scale_data *win = NULL; static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1)); s32 fail_count, tpt; if (scale_idx < 0 || scale_idx >= RATE_COUNT) return -EINVAL; /* Select win for current tx bit rate */ win = &(tbl->win[scale_idx]); /* Get expected throughput */ tpt = il4965_get_expected_tpt(tbl, scale_idx); /* * Keep track of only the latest 62 tx frame attempts in this rate's * history win; anything older isn't really relevant any more. * If we have filled up the sliding win, 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 (win->counter >= RATE_MAX_WINDOW) { /* remove earliest */ win->counter = RATE_MAX_WINDOW - 1; if (win->data & mask) { win->data &= ~mask; win->success_counter--; } } /* Increment frames-attempted counter */ win->counter++; /* Shift bitmap by one frame to throw away oldest history */ win->data <<= 1; /* Mark the most recent #successes attempts as successful */ if (successes > 0) { win->success_counter++; win->data |= 0x1; successes--; } attempts--; } /* Calculate current success ratio, avoid divide-by-0! */ if (win->counter > 0) win->success_ratio = 128 * (100 * win->success_counter) / win->counter; else win->success_ratio = IL_INVALID_VALUE; fail_count = win->counter - win->success_counter; /* Calculate average throughput, if we have enough history. */ if (fail_count >= RATE_MIN_FAILURE_TH || win->success_counter >= RATE_MIN_SUCCESS_TH) win->average_tpt = (win->success_ratio * tpt + 64) / 128; else win->average_tpt = IL_INVALID_VALUE; /* Tag this win as having been updated */ win->stamp = jiffies; return 0; } /* * Fill uCode API rate_n_flags field, based on "search" or "active" table. */ static u32 il4965_rate_n_flags_from_tbl(struct il_priv *il, struct il_scale_tbl_info *tbl, int idx, u8 use_green) { u32 rate_n_flags = 0; if (is_legacy(tbl->lq_type)) { rate_n_flags = il_rates[idx].plcp; if (idx >= IL_FIRST_CCK_RATE && idx <= IL_LAST_CCK_RATE) rate_n_flags |= RATE_MCS_CCK_MSK; } else if (is_Ht(tbl->lq_type)) { if (idx > IL_LAST_OFDM_RATE) { IL_ERR("Invalid HT rate idx %d\n", idx); idx = IL_LAST_OFDM_RATE; } rate_n_flags = RATE_MCS_HT_MSK; if (is_siso(tbl->lq_type)) rate_n_flags |= il_rates[idx].plcp_siso; else rate_n_flags |= il_rates[idx].plcp_mimo2; } else { IL_ERR("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) { if (tbl->is_dup) rate_n_flags |= RATE_MCS_DUP_MSK; else rate_n_flags |= RATE_MCS_HT40_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; IL_ERR("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 il4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags, enum nl80211_band band, struct il_scale_tbl_info *tbl, int *rate_idx) { u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK); u8 il4965_num_of_ant = il4965_get_il4965_num_of_ant_from_rate(rate_n_flags); u8 mcs; memset(tbl, 0, sizeof(struct il_scale_tbl_info)); *rate_idx = il4965_hwrate_to_plcp_idx(rate_n_flags); if (*rate_idx == RATE_INVALID) { *rate_idx = -1; return -EINVAL; } tbl->is_SGI = 0; /* default legacy setup */ tbl->is_ht40 = 0; tbl->is_dup = 0; tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS); tbl->lq_type = LQ_NONE; tbl->max_search = IL_MAX_SEARCH; /* legacy rate format */ if (!(rate_n_flags & RATE_MCS_HT_MSK)) { if (il4965_num_of_ant == 1) { if (band == NL80211_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_HT40_MSK) || (rate_n_flags & RATE_MCS_DUP_MSK)) tbl->is_ht40 = 1; if (rate_n_flags & RATE_MCS_DUP_MSK) tbl->is_dup = 1; mcs = il4965_rs_extract_rate(rate_n_flags); /* SISO */ if (mcs <= RATE_SISO_60M_PLCP) { if (il4965_num_of_ant == 1) tbl->lq_type = LQ_SISO; /*else NONE */ /* MIMO2 */ } else { if (il4965_num_of_ant == 2) tbl->lq_type = LQ_MIMO2; } } return 0; } /* switch to another antenna/antennas and return 1 */ /* if no other valid antenna found, return 0 */ static int il4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags, struct il_scale_tbl_info *tbl) { u8 new_ant_type; if (!tbl->ant_type || tbl->ant_type > ANT_ABC) return 0; if (!il4965_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 && !il4965_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 il4965_rs_use_green(struct il_priv *il, struct ieee80211_sta *sta) { return (sta->deflink.ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) && !il->ht.non_gf_sta_present; } /* * il4965_rs_get_supported_rates - get the available rates * * if management frame or broadcast frame only return * basic available rates. * */ static u16 il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta, struct ieee80211_hdr *hdr, enum il_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 return lq_sta->active_mimo2_rate; } } static u16 il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask, int rate_type) { u8 high = RATE_INVALID; u8 low = 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 = idx - 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 = idx + 1; for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) { if (rate_mask & mask) { high = i; break; } } return (high << 8) | low; } low = idx; while (low != RATE_INVALID) { low = il_rates[low].prev_rs; if (low == RATE_INVALID) break; if (rate_mask & (1 << low)) break; D_RATE("Skipping masked lower rate: %d\n", low); } high = idx; while (high != RATE_INVALID) { high = il_rates[high].next_rs; if (high == RATE_INVALID) break; if (rate_mask & (1 << high)) break; D_RATE("Skipping masked higher rate: %d\n", high); } return (high << 8) | low; } static u32 il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta, struct il_scale_tbl_info *tbl, u8 scale_idx, u8 ht_possible) { s32 low; u16 rate_mask; u16 high_low; u8 switch_to_legacy = 0; u8 is_green = lq_sta->is_green; struct il_priv *il = 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_idx)) { switch_to_legacy = 1; scale_idx = rs_ht_to_legacy[scale_idx]; if (lq_sta->band == NL80211_BAND_5GHZ) tbl->lq_type = LQ_A; else tbl->lq_type = LQ_G; if (il4965_num_of_ant(tbl->ant_type) > 1) tbl->ant_type = il4965_first_antenna(il->hw_params.valid_tx_ant); tbl->is_ht40 = 0; tbl->is_SGI = 0; tbl->max_search = IL_MAX_SEARCH; } rate_mask = il4965_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 == NL80211_BAND_5GHZ) rate_mask = (u16) (rate_mask & (lq_sta->supp_rates << IL_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_idx))) { low = scale_idx; goto out; } high_low = il4965_rs_get_adjacent_rate(lq_sta->drv, scale_idx, rate_mask, tbl->lq_type); low = high_low & 0xff; if (low == RATE_INVALID) low = scale_idx; out: return il4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green); } /* * Simple function to compare two rate scale table types */ static bool il4965_table_type_matches(struct il_scale_tbl_info *a, struct il_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 il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband, struct ieee80211_sta *sta, void *il_sta, struct sk_buff *skb) { int legacy_success; int retries; int rs_idx, mac_idx, i; struct il_lq_sta *lq_sta = il_sta; struct il_link_quality_cmd *table; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; struct il_priv *il = (struct il_priv *)il_r; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); enum mac80211_rate_control_flags mac_flags; u32 tx_rate; struct il_scale_tbl_info tbl_type; struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; D_RATE("get frame ack response, update rate scale win\n"); /* Treat uninitialized rate scaling data same as non-existing. */ if (!lq_sta) { D_RATE("Station rate scaling not created yet.\n"); return; } else if (!lq_sta->drv) { D_RATE("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].rate_n_flags); il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx); if (il->band == NL80211_BAND_5GHZ) rs_idx -= IL_FIRST_OFDM_RATE; mac_flags = info->status.rates[0].flags; mac_idx = info->status.rates[0].idx; /* For HT packets, map MCS to PLCP */ if (mac_flags & IEEE80211_TX_RC_MCS) { mac_idx &= RATE_MCS_CODE_MSK; /* Remove # of streams */ if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE)) mac_idx++; /* * mac80211 HT idx is always zero-idxed; we need to move * HT OFDM rates after CCK rates in 2.4 GHz band */ if (il->band == NL80211_BAND_2GHZ) mac_idx += IL_FIRST_OFDM_RATE; } /* Here we actually compare this rate to the latest LQ command */ if (mac_idx < 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.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA) || tbl_type.ant_type != info->status.antenna || !!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS) || !!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD) || rs_idx != mac_idx) { D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx, rs_idx, tx_rate); /* * Since rates mis-match, the last LQ command may have failed. * After IL_MISSED_RATE_MAX mis-matches, resync the uCode with * ... driver. */ lq_sta->missed_rate_counter++; if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) { lq_sta->missed_rate_counter = 0; il_send_lq_cmd(il, &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 (il4965_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 (il4965_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 { D_RATE("Neither active nor search matches tx rate\n"); tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); D_RATE("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]); D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI); D_RATE("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 */ il4965_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 idx into rate scale table. */ if (info->flags & IEEE80211_TX_STAT_AMPDU) { tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx); il4965_rs_collect_tx_data(curr_tbl, rs_idx, 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].rate_n_flags); il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx); /* * Only collect stats if retried rate is in the same RS * table as active/search. */ if (il4965_table_type_matches(&tbl_type, curr_tbl)) tmp_tbl = curr_tbl; else if (il4965_table_type_matches (&tbl_type, other_tbl)) tmp_tbl = other_tbl; else continue; il4965_rs_collect_tx_data(tmp_tbl, rs_idx, 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->deflink.supp_rates[sband->band]) il4965_rs_rate_scale_perform(il, 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 stats. * These control how long we stay using same modulation mode before * searching for a new mode. */ static void il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy, struct il_lq_sta *lq_sta) { D_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 = IL_LEGACY_TBL_COUNT; lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT; lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT; } else { lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT; lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT; lq_sta->max_success_limit = IL_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 il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta, struct il_scale_tbl_info *tbl) { /* Used to choose among HT tables */ s32(*ht_tbl_pointer)[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), channel width (20/40), SGI, and aggregation * status */ if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup)) 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 || lq_sta->is_dup)) ht_tbl_pointer = expected_tpt_mimo2_20MHz; else /* if (is_mimo2(tbl->lq_type)) <-- must be true */ ht_tbl_pointer = expected_tpt_mimo2_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 il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta, struct il_scale_tbl_info *tbl, /* "search" */ u16 rate_mask, s8 idx) { /* "active" values */ struct il_scale_tbl_info *active_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); s32 active_sr = active_tbl->win[idx].success_ratio; s32 active_tpt = active_tbl->expected_tpt[idx]; /* expected "search" throughput */ s32 *tpt_tbl = tbl->expected_tpt; s32 new_rate, high, low, start_hi; u16 high_low; s8 rate = idx; new_rate = high = low = start_hi = RATE_INVALID; for (;;) { high_low = il4965_rs_get_adjacent_rate(il, 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 > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH && tpt_tbl[rate] <= active_tpt)) || (active_sr >= 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 != RATE_INVALID) { new_rate = start_hi; break; } new_rate = rate; /* Loop again with lower rate */ if (low != 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 != RATE_INVALID) break; /* Loop again with higher rate */ else if (high != RATE_INVALID) { start_hi = high; rate = high; /* Higher rate not available, use the original */ } else { new_rate = rate; break; } } } return new_rate; } /* * Set up search table for MIMO2 */ static int il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta, struct ieee80211_conf *conf, struct ieee80211_sta *sta, struct il_scale_tbl_info *tbl, int idx) { u16 rate_mask; s32 rate; s8 is_green = lq_sta->is_green; if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported) return -1; if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC) return -1; /* Need both Tx chains/antennas to support MIMO */ if (il->hw_params.tx_chains_num < 2) return -1; D_RATE("LQ: try to switch to MIMO2\n"); tbl->lq_type = LQ_MIMO2; tbl->is_dup = lq_sta->is_dup; tbl->action = 0; tbl->max_search = IL_MAX_SEARCH; rate_mask = lq_sta->active_mimo2_rate; if (il_is_ht40_tx_allowed(il, &sta->deflink.ht_cap)) tbl->is_ht40 = 1; else tbl->is_ht40 = 0; il4965_rs_set_expected_tpt_table(lq_sta, tbl); rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx); D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask); if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) { D_RATE("Can't switch with idx %d rate mask %x\n", rate, rate_mask); return -1; } tbl->current_rate = il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green); D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate, is_green); return 0; } /* * Set up search table for SISO */ static int il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta, struct ieee80211_conf *conf, struct ieee80211_sta *sta, struct il_scale_tbl_info *tbl, int idx) { u16 rate_mask; u8 is_green = lq_sta->is_green; s32 rate; if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported) return -1; D_RATE("LQ: try to switch to SISO\n"); tbl->is_dup = lq_sta->is_dup; tbl->lq_type = LQ_SISO; tbl->action = 0; tbl->max_search = IL_MAX_SEARCH; rate_mask = lq_sta->active_siso_rate; if (il_is_ht40_tx_allowed(il, &sta->deflink.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 */ il4965_rs_set_expected_tpt_table(lq_sta, tbl); rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx); D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask); if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) { D_RATE("can not switch with idx %d rate mask %x\n", rate, rate_mask); return -1; } tbl->current_rate = il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green); D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate, is_green); return 0; } /* * Try to switch to new modulation mode from legacy */ static int il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta, struct ieee80211_conf *conf, struct ieee80211_sta *sta, int idx) { struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); struct il_scale_tbl_info *search_tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); struct il_rate_scale_data *win = &(tbl->win[idx]); u32 sz = (sizeof(struct il_scale_tbl_info) - (sizeof(struct il_rate_scale_data) * RATE_COUNT)); u8 start_action; u8 valid_tx_ant = il->hw_params.valid_tx_ant; u8 tx_chains_num = il->hw_params.tx_chains_num; int ret = 0; u8 update_search_tbl_counter = 0; tbl->action = IL_LEGACY_SWITCH_SISO; start_action = tbl->action; for (;;) { lq_sta->action_counter++; switch (tbl->action) { case IL_LEGACY_SWITCH_ANTENNA1: case IL_LEGACY_SWITCH_ANTENNA2: D_RATE("LQ: Legacy toggle Antenna\n"); if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 && tx_chains_num <= 1) || (tbl->action == IL_LEGACY_SWITCH_ANTENNA2 && tx_chains_num <= 2)) break; /* Don't change antenna if success has been great */ if (win->success_ratio >= IL_RS_GOOD_RATIO) break; /* Set up search table to try other antenna */ memcpy(search_tbl, tbl, sz); if (il4965_rs_toggle_antenna (valid_tx_ant, &search_tbl->current_rate, search_tbl)) { update_search_tbl_counter = 1; il4965_rs_set_expected_tpt_table(lq_sta, search_tbl); goto out; } break; case IL_LEGACY_SWITCH_SISO: D_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 = il4965_rs_switch_to_siso(il, lq_sta, conf, sta, search_tbl, idx); if (!ret) { lq_sta->action_counter = 0; goto out; } break; case IL_LEGACY_SWITCH_MIMO2_AB: case IL_LEGACY_SWITCH_MIMO2_AC: case IL_LEGACY_SWITCH_MIMO2_BC: D_RATE("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 == IL_LEGACY_SWITCH_MIMO2_AB) search_tbl->ant_type = ANT_AB; else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC) search_tbl->ant_type = ANT_AC; else search_tbl->ant_type = ANT_BC; if (!il4965_rs_is_valid_ant (valid_tx_ant, search_tbl->ant_type)) break; ret = il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta, search_tbl, idx); if (!ret) { lq_sta->action_counter = 0; goto out; } break; } tbl->action++; if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC) tbl->action = IL_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 > IL_LEGACY_SWITCH_MIMO2_BC) tbl->action = IL_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 il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta, struct ieee80211_conf *conf, struct ieee80211_sta *sta, int idx) { u8 is_green = lq_sta->is_green; struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); struct il_scale_tbl_info *search_tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); struct il_rate_scale_data *win = &(tbl->win[idx]); struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap; u32 sz = (sizeof(struct il_scale_tbl_info) - (sizeof(struct il_rate_scale_data) * RATE_COUNT)); u8 start_action; u8 valid_tx_ant = il->hw_params.valid_tx_ant; u8 tx_chains_num = il->hw_params.tx_chains_num; u8 update_search_tbl_counter = 0; int ret; start_action = tbl->action; for (;;) { lq_sta->action_counter++; switch (tbl->action) { case IL_SISO_SWITCH_ANTENNA1: case IL_SISO_SWITCH_ANTENNA2: D_RATE("LQ: SISO toggle Antenna\n"); if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 && tx_chains_num <= 1) || (tbl->action == IL_SISO_SWITCH_ANTENNA2 && tx_chains_num <= 2)) break; if (win->success_ratio >= IL_RS_GOOD_RATIO) break; memcpy(search_tbl, tbl, sz); if (il4965_rs_toggle_antenna (valid_tx_ant, &search_tbl->current_rate, search_tbl)) { update_search_tbl_counter = 1; goto out; } break; case IL_SISO_SWITCH_MIMO2_AB: case IL_SISO_SWITCH_MIMO2_AC: case IL_SISO_SWITCH_MIMO2_BC: D_RATE("LQ: SISO switch to MIMO2\n"); memcpy(search_tbl, tbl, sz); search_tbl->is_SGI = 0; if (tbl->action == IL_SISO_SWITCH_MIMO2_AB) search_tbl->ant_type = ANT_AB; else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC) search_tbl->ant_type = ANT_AC; else search_tbl->ant_type = ANT_BC; if (!il4965_rs_is_valid_ant (valid_tx_ant, search_tbl->ant_type)) break; ret = il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta, search_tbl, idx); if (!ret) goto out; break; case IL_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; D_RATE("LQ: SISO toggle SGI/NGI\n"); memcpy(search_tbl, tbl, sz); if (is_green) { if (!tbl->is_SGI) break; else IL_ERR("SGI was set in GF+SISO\n"); } search_tbl->is_SGI = !tbl->is_SGI; il4965_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[idx]) break; } search_tbl->current_rate = il4965_rate_n_flags_from_tbl(il, search_tbl, idx, is_green); update_search_tbl_counter = 1; goto out; } tbl->action++; if (tbl->action > IL_SISO_SWITCH_GI) tbl->action = IL_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 > IL_SISO_SWITCH_GI) tbl->action = IL_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 il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta, struct ieee80211_conf *conf, struct ieee80211_sta *sta, int idx) { s8 is_green = lq_sta->is_green; struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); struct il_scale_tbl_info *search_tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); struct il_rate_scale_data *win = &(tbl->win[idx]); struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap; u32 sz = (sizeof(struct il_scale_tbl_info) - (sizeof(struct il_rate_scale_data) * RATE_COUNT)); u8 start_action; u8 valid_tx_ant = il->hw_params.valid_tx_ant; u8 tx_chains_num = il->hw_params.tx_chains_num; u8 update_search_tbl_counter = 0; int ret; start_action = tbl->action; for (;;) { lq_sta->action_counter++; switch (tbl->action) { case IL_MIMO2_SWITCH_ANTENNA1: case IL_MIMO2_SWITCH_ANTENNA2: D_RATE("LQ: MIMO2 toggle Antennas\n"); if (tx_chains_num <= 2) break; if (win->success_ratio >= IL_RS_GOOD_RATIO) break; memcpy(search_tbl, tbl, sz); if (il4965_rs_toggle_antenna (valid_tx_ant, &search_tbl->current_rate, search_tbl)) { update_search_tbl_counter = 1; goto out; } break; case IL_MIMO2_SWITCH_SISO_A: case IL_MIMO2_SWITCH_SISO_B: case IL_MIMO2_SWITCH_SISO_C: D_RATE("LQ: MIMO2 switch to SISO\n"); /* Set up new search table for SISO */ memcpy(search_tbl, tbl, sz); if (tbl->action == IL_MIMO2_SWITCH_SISO_A) search_tbl->ant_type = ANT_A; else if (tbl->action == IL_MIMO2_SWITCH_SISO_B) search_tbl->ant_type = ANT_B; else search_tbl->ant_type = ANT_C; if (!il4965_rs_is_valid_ant (valid_tx_ant, search_tbl->ant_type)) break; ret = il4965_rs_switch_to_siso(il, lq_sta, conf, sta, search_tbl, idx); if (!ret) goto out; break; case IL_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; D_RATE("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; il4965_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[idx]) break; } search_tbl->current_rate = il4965_rate_n_flags_from_tbl(il, search_tbl, idx, is_green); update_search_tbl_counter = 1; goto out; } tbl->action++; if (tbl->action > IL_MIMO2_SWITCH_GI) tbl->action = IL_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 > IL_MIMO2_SWITCH_GI) tbl->action = IL_MIMO2_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 il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search) { struct il_scale_tbl_info *tbl; int i; int active_tbl; int flush_interval_passed = 0; struct il_priv *il; il = 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 + 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)) { D_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; D_RATE("LQ: stay in table clear win\n"); for (i = 0; i < RATE_COUNT; i++) il4965_rs_rate_scale_clear_win(& (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 < RATE_COUNT; i++) il4965_rs_rate_scale_clear_win(&(tbl->win[i])); } } } /* * setup rate table in uCode */ static void il4965_rs_update_rate_tbl(struct il_priv *il, struct il_lq_sta *lq_sta, struct il_scale_tbl_info *tbl, int idx, u8 is_green) { u32 rate; /* Update uCode's rate table. */ rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green); il4965_rs_fill_link_cmd(il, lq_sta, rate); il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false); } /* * Do rate scaling and search for new modulation mode. */ static void il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb, struct ieee80211_sta *sta, struct il_lq_sta *lq_sta) { struct ieee80211_hw *hw = il->hw; struct ieee80211_conf *conf = &hw->conf; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; int low = RATE_INVALID; int high = RATE_INVALID; int idx; int i; struct il_rate_scale_data *win = NULL; int current_tpt = IL_INVALID_VALUE; int low_tpt = IL_INVALID_VALUE; int high_tpt = IL_INVALID_VALUE; u32 fail_count; s8 scale_action = 0; u16 rate_mask; u8 update_lq = 0; struct il_scale_tbl_info *tbl, *tbl1; u16 rate_scale_idx_msk = 0; u8 is_green = 0; u8 active_tbl = 0; u8 done_search = 0; u16 high_low; s32 sr; u8 tid; struct il_tid_data *tid_data; D_RATE("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->deflink.supp_rates[lq_sta->band]; tid = il4965_rs_tl_add_packet(lq_sta, hdr); if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) { tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid]; if (tid_data->agg.state == IL_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 = il4965_rs_use_green(il, sta); is_green = lq_sta->is_green; /* current tx rate */ idx = lq_sta->last_txrate_idx; D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type); /* rates available for this association, and for modulation mode */ rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type); D_RATE("mask 0x%04X\n", rate_mask); /* mask with station rate restriction */ if (is_legacy(tbl->lq_type)) { if (lq_sta->band == NL80211_BAND_5GHZ) /* supp_rates has no CCK bits in A mode */ rate_scale_idx_msk = (u16) (rate_mask & (lq_sta->supp_rates << IL_FIRST_OFDM_RATE)); else rate_scale_idx_msk = (u16) (rate_mask & lq_sta->supp_rates); } else rate_scale_idx_msk = rate_mask; if (!rate_scale_idx_msk) rate_scale_idx_msk = rate_mask; if (!((1 << idx) & rate_scale_idx_msk)) { IL_ERR("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 */ idx = il4965_hwrate_to_plcp_idx(tbl->current_rate); il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green); } return; } /* Get expected throughput table and history win for current rate */ if (!tbl->expected_tpt) { IL_ERR("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 < idx) { idx = lq_sta->max_rate_idx; update_lq = 1; win = &(tbl->win[idx]); goto lq_update; } win = &(tbl->win[idx]); /* * 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 = win->counter - win->success_counter; if (fail_count < RATE_MIN_FAILURE_TH && win->success_counter < RATE_MIN_SUCCESS_TH) { D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n", win->success_counter, win->counter, idx); /* Can't calculate this yet; not enough history */ win->average_tpt = IL_INVALID_VALUE; /* Should we stay with this modulation mode, * or search for a new one? */ il4965_rs_stay_in_table(lq_sta, false); goto out; } /* Else we have enough samples; calculate estimate of * actual average throughput */ if (win->average_tpt != ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) { IL_ERR("expected_tpt should have been calculated by now\n"); win->average_tpt = ((win->success_ratio * tbl->expected_tpt[idx] + 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 (win->average_tpt > lq_sta->last_tpt) { D_RATE("LQ: SWITCHING TO NEW TBL " "suc=%d cur-tpt=%d old-tpt=%d\n", win->success_ratio, win->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 = win->average_tpt; /* Else poor success; go back to mode in "active" table */ } else { D_RATE("LQ: GOING BACK TO THE OLD TBL " "suc=%d cur-tpt=%d old-tpt=%d\n", win->success_ratio, win->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 */ idx = il4965_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 = il4965_rs_get_adjacent_rate(il, idx, rate_scale_idx_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 = RATE_INVALID; sr = win->success_ratio; /* Collect measured throughputs for current and adjacent rates */ current_tpt = win->average_tpt; if (low != RATE_INVALID) low_tpt = tbl->win[low].average_tpt; if (high != RATE_INVALID) high_tpt = tbl->win[high].average_tpt; scale_action = 0; /* Too many failures, decrease rate */ if (sr <= RATE_DECREASE_TH || current_tpt == 0) { D_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 == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) { if (high != RATE_INVALID && sr >= RATE_INCREASE_TH) scale_action = 1; else if (low != 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 != IL_INVALID_VALUE && high_tpt != IL_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 != IL_INVALID_VALUE) { /* Higher rate has better throughput */ if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH) scale_action = 1; else scale_action = 0; /* Lower adjacent rate's throughput is measured */ } else if (low_tpt != IL_INVALID_VALUE) { /* Lower rate has better throughput */ if (low_tpt > current_tpt) { D_RATE("decrease rate because of low tpt\n"); scale_action = -1; } else if (sr >= 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 != RATE_INVALID && (sr > 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 != RATE_INVALID) { update_lq = 1; idx = low; } break; case 1: /* Increase starting rate, update uCode's rate table */ if (high != RATE_INVALID) { update_lq = 1; idx = high; } break; case 0: /* No change */ default: break; } D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n", idx, scale_action, low, high, tbl->lq_type); lq_update: /* Replace uCode's rate table for the destination station. */ if (update_lq) il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green); /* Should we stay with this modulation mode, * or search for a new one? */ il4965_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 && win->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)) il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx); else if (is_siso(tbl->lq_type)) il4965_rs_move_siso_to_other(il, lq_sta, conf, sta, idx); else /* (is_mimo2(tbl->lq_type)) */ il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta, idx); /* 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 < RATE_COUNT; i++) il4965_rs_rate_scale_clear_win(&(tbl->win[i])); /* Use new "search" start rate */ idx = il4965_hwrate_to_plcp_idx(tbl->current_rate); D_RATE("Switch current mcs: %X idx: %d\n", tbl->current_rate, idx); il4965_rs_fill_link_cmd(il, lq_sta, tbl->current_rate); il_send_lq_cmd(il, &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) && !conf_is_ht(conf) && lq_sta->action_counter > tbl1->max_search) { D_RATE("LQ: STAY in legacy table\n"); il4965_rs_set_stay_in_table(il, 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 > IL_AGG_TPT_THREHOLD && (lq_sta->tx_agg_tid_en & (1 << tid)) && tid != MAX_TID_COUNT) { tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid]; if (tid_data->agg.state == IL_AGG_OFF) { D_RATE("try to aggregate tid %d\n", tid); il4965_rs_tl_turn_on_agg(il, tid, lq_sta, sta); } } il4965_rs_set_stay_in_table(il, 0, lq_sta); } } out: tbl->current_rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green); i = idx; lq_sta->last_txrate_idx = i; } /* * il4965_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-4965-rs rate scaling algorithm is used, instead of * rc80211_simple. * * NOTE: Run C_ADD_STA command to set up station table entry, before * calling this function (which runs C_TX_LINK_QUALITY_CMD, * which requires station table entry to exist). */ static void il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf, struct ieee80211_sta *sta, struct il_lq_sta *lq_sta) { struct il_scale_tbl_info *tbl; int rate_idx; int i; u32 rate; u8 use_green; u8 active_tbl = 0; u8 valid_tx_ant; if (!sta || !lq_sta) return; use_green = il4965_rs_use_green(il, sta); i = lq_sta->last_txrate_idx; valid_tx_ant = il->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 >= RATE_COUNT) i = 0; rate = il_rates[i].plcp; tbl->ant_type = il4965_first_antenna(valid_tx_ant); rate |= tbl->ant_type << RATE_MCS_ANT_POS; if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE) rate |= RATE_MCS_CCK_MSK; il4965_rs_get_tbl_info_from_mcs(rate, il->band, tbl, &rate_idx); if (!il4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type)) il4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl); rate = il4965_rate_n_flags_from_tbl(il, tbl, rate_idx, use_green); tbl->current_rate = rate; il4965_rs_set_expected_tpt_table(lq_sta, tbl); il4965_rs_fill_link_cmd(NULL, lq_sta, rate); il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq; il_send_lq_cmd(il, &lq_sta->lq, CMD_SYNC, true); } static void il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta, struct ieee80211_tx_rate_control *txrc) { struct sk_buff *skb = txrc->skb; struct ieee80211_supported_band *sband = txrc->sband; struct il_priv *il __maybe_unused = (struct il_priv *)il_r; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct il_lq_sta *lq_sta = il_sta; int rate_idx; D_RATE("rate scale calculate new rate for skb\n"); /* Get max rate if user set max rate */ if (lq_sta) { lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1; if (sband->band == NL80211_BAND_5GHZ && lq_sta->max_rate_idx != -1) lq_sta->max_rate_idx += IL_FIRST_OFDM_RATE; if (lq_sta->max_rate_idx < 0 || lq_sta->max_rate_idx >= RATE_COUNT) lq_sta->max_rate_idx = -1; } /* Treat uninitialized rate scaling data same as non-existing. */ if (lq_sta && !lq_sta->drv) { D_RATE("Rate scaling not initialized yet.\n"); il_sta = NULL; } if (!lq_sta) return; rate_idx = lq_sta->last_txrate_idx; if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) { rate_idx -= IL_FIRST_OFDM_RATE; /* 6M and 9M shared same MCS idx */ rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0; if (il4965_rs_extract_rate(lq_sta->last_rate_n_flags) >= RATE_MIMO2_6M_PLCP) rate_idx = rate_idx + MCS_IDX_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_DUP_MSK) info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA; if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK) info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK) info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD; } else { /* Check for invalid rates */ if (rate_idx < 0 || rate_idx >= RATE_COUNT_LEGACY || (sband->band == NL80211_BAND_5GHZ && rate_idx < IL_FIRST_OFDM_RATE)) rate_idx = rate_lowest_index(sband, sta); /* On valid 5 GHz rate, adjust idx */ else if (sband->band == NL80211_BAND_5GHZ) rate_idx -= IL_FIRST_OFDM_RATE; info->control.rates[0].flags = 0; } info->control.rates[0].idx = rate_idx; info->control.rates[0].count = 1; } static void * il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp) { struct il_station_priv *sta_priv = (struct il_station_priv *)sta->drv_priv; struct il_priv *il; il = (struct il_priv *)il_rate; D_RATE("create station rate scale win\n"); return &sta_priv->lq_sta; } /* * Called after adding a new station to initialize rate scaling */ void il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id) { int i, j; struct ieee80211_hw *hw = il->hw; struct ieee80211_conf *conf = &il->hw->conf; struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap; struct il_station_priv *sta_priv; struct il_lq_sta *lq_sta; struct ieee80211_supported_band *sband; sta_priv = (struct il_station_priv *)sta->drv_priv; lq_sta = &sta_priv->lq_sta; sband = hw->wiphy->bands[conf->chandef.chan->band]; lq_sta->lq.sta_id = sta_id; for (j = 0; j < LQ_SIZE; j++) for (i = 0; i < RATE_COUNT; i++) il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j]. win[i]); lq_sta->flush_timer = 0; lq_sta->supp_rates = sta->deflink.supp_rates[sband->band]; for (j = 0; j < LQ_SIZE; j++) for (i = 0; i < RATE_COUNT; i++) il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j]. win[i]); D_RATE("LQ:" "*** rate scale station global init for station %d ***\n", 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->is_dup = 0; lq_sta->max_rate_idx = -1; lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX; lq_sta->is_green = il4965_rs_use_green(il, sta); lq_sta->active_legacy_rate = il->active_rate & ~(0x1000); lq_sta->band = il->band; /* * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3), * supp_rates[] does not; shift to convert format, force 9 MBits off. */ lq_sta->active_siso_rate = 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 <<= IL_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 <<= IL_FIRST_OFDM_RATE; /* These values will be overridden later */ lq_sta->lq.general_params.single_stream_ant_msk = il4965_first_antenna(il->hw_params.valid_tx_ant); lq_sta->lq.general_params.dual_stream_ant_msk = il->hw_params.valid_tx_ant & ~il4965_first_antenna(il->hw_params. valid_tx_ant); if (!lq_sta->lq.general_params.dual_stream_ant_msk) { lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB; } else if (il4965_num_of_ant(il->hw_params.valid_tx_ant) == 2) { lq_sta->lq.general_params.dual_stream_ant_msk = il->hw_params.valid_tx_ant; } /* as default allow aggregation for all tids */ lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID; lq_sta->drv = il; /* Set last_txrate_idx to lowest rate */ lq_sta->last_txrate_idx = rate_lowest_index(sband, sta); if (sband->band == NL80211_BAND_5GHZ) lq_sta->last_txrate_idx += IL_FIRST_OFDM_RATE; lq_sta->is_agg = 0; #ifdef CONFIG_MAC80211_DEBUGFS lq_sta->dbg_fixed_rate = 0; #endif il4965_rs_initialize_lq(il, conf, sta, lq_sta); } static void il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta, u32 new_rate) { struct il_scale_tbl_info tbl_type; int idx = 0; int rate_idx; int repeat_rate = 0; u8 ant_toggle_cnt = 0; u8 use_ht_possible = 1; u8 valid_tx_ant = 0; struct il_link_quality_cmd *lq_cmd = &lq_sta->lq; /* Override starting rate (idx 0) if needed for debug purposes */ il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx); /* Interpret new_rate (rate_n_flags) */ il4965_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 = IL_NUMBER_TRY; } else { repeat_rate = IL_HT_NUMBER_TRY; } lq_cmd->general_params.mimo_delimiter = is_mimo(tbl_type.lq_type) ? 1 : 0; /* Fill 1st table entry (idx 0) */ lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate); if (il4965_num_of_ant(tbl_type.ant_type) == 1) { lq_cmd->general_params.single_stream_ant_msk = tbl_type.ant_type; } else if (il4965_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 */ idx++; repeat_rate--; if (il) valid_tx_ant = il->hw_params.valid_tx_ant; /* Fill rest of rate table */ while (idx < LINK_QUAL_MAX_RETRY_NUM) { /* Repeat initial/next rate. * For legacy IL_NUMBER_TRY == 1, this loop will not execute. * For HT IL_HT_NUMBER_TRY == 3, this executes twice. */ while (repeat_rate > 0 && idx < (LINK_QUAL_MAX_RETRY_NUM - 1)) { if (is_legacy(tbl_type.lq_type)) { if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) ant_toggle_cnt++; else if (il && il4965_rs_toggle_antenna(valid_tx_ant, &new_rate, &tbl_type)) ant_toggle_cnt = 1; } /* Override next rate if needed for debug purposes */ il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx); /* Fill next table entry */ lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate); repeat_rate--; idx++; } il4965_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 (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */ if (is_mimo(tbl_type.lq_type)) lq_cmd->general_params.mimo_delimiter = idx; /* Get next rate */ new_rate = il4965_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 (il && il4965_rs_toggle_antenna(valid_tx_ant, &new_rate, &tbl_type)) ant_toggle_cnt = 1; repeat_rate = IL_NUMBER_TRY; } else { repeat_rate = IL_HT_NUMBER_TRY; } /* Don't allow HT rates after next pass. * il4965_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 */ il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx); /* Fill next table entry */ lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate); idx++; repeat_rate--; } lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF; lq_cmd->agg_params.agg_time_limit = cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF); } static void * il4965_rs_alloc(struct ieee80211_hw *hw) { return hw->priv; } /* rate scale requires free function to be implemented */ static void il4965_rs_free(void *il_rate) { return; } static void il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta) { struct il_priv *il __maybe_unused = il_r; D_RATE("enter\n"); D_RATE("leave\n"); } #ifdef CONFIG_MAC80211_DEBUGFS static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx) { struct il_priv *il; u8 valid_tx_ant; u8 ant_sel_tx; il = lq_sta->drv; valid_tx_ant = il->hw_params.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; D_RATE("Fixed rate ON\n"); } else { lq_sta->dbg_fixed_rate = 0; IL_ERR ("Invalid antenna selection 0x%X, Valid is 0x%X\n", ant_sel_tx, valid_tx_ant); D_RATE("Fixed rate OFF\n"); } } else { D_RATE("Fixed rate OFF\n"); } } static ssize_t il4965_rs_sta_dbgfs_scale_table_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { struct il_lq_sta *lq_sta = file->private_data; struct il_priv *il; char buf[64]; size_t buf_size; u32 parsed_rate; il = 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 */ D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate); if (lq_sta->dbg_fixed_rate) { il4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate); il_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false); } return count; } static ssize_t il4965_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 idx = 0; ssize_t ret; struct il_lq_sta *lq_sta = file->private_data; struct il_priv *il; struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); il = 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", (il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "", (il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "", (il->hw_params.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" : "MIMO2"); 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.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_idx[0], lq_sta->lq.general_params.start_rate_idx[1], lq_sta->lq.general_params.start_rate_idx[2], lq_sta->lq.general_params.start_rate_idx[3]); for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { idx = il4965_hwrate_to_plcp_idx(le32_to_cpu (lq_sta->lq.rs_table[i]. rate_n_flags)); 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]. rate_n_flags), il_rate_mcs[idx].mbps); } else { desc += sprintf(buff + desc, " rate[%d] 0x%X %smbps (%s)\n", i, le32_to_cpu(lq_sta->lq.rs_table[i]. rate_n_flags), il_rate_mcs[idx].mbps, il_rate_mcs[idx].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 = il4965_rs_sta_dbgfs_scale_table_write, .read = il4965_rs_sta_dbgfs_scale_table_read, .open = simple_open, .llseek = default_llseek, }; static ssize_t il4965_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 il_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=%d 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->lq_info[i].is_dup, lq_sta->is_green, lq_sta->lq_info[i].current_rate); for (j = 0; j < 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 = il4965_rs_sta_dbgfs_stats_table_read, .open = simple_open, .llseek = default_llseek, }; static ssize_t il4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { char buff[120]; int desc = 0; struct il_lq_sta *lq_sta = file->private_data; struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 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", il_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 = il4965_rs_sta_dbgfs_rate_scale_data_read, .open = simple_open, .llseek = default_llseek, }; static void il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir) { struct il_lq_sta *lq_sta = il_sta; debugfs_create_file("rate_scale_table", 0600, dir, lq_sta, &rs_sta_dbgfs_scale_table_ops); debugfs_create_file("rate_stats_table", 0400, dir, lq_sta, &rs_sta_dbgfs_stats_table_ops); debugfs_create_file("rate_scale_data", 0400, dir, lq_sta, &rs_sta_dbgfs_rate_scale_data_ops); debugfs_create_u8("tx_agg_tid_enable", 0600, dir, &lq_sta->tx_agg_tid_en); } #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 il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband, struct cfg80211_chan_def *chandef, struct ieee80211_sta *sta, void *il_sta) { } static const struct rate_control_ops rs_4965_ops = { .name = IL4965_RS_NAME, .tx_status = il4965_rs_tx_status, .get_rate = il4965_rs_get_rate, .rate_init = il4965_rs_rate_init_stub, .alloc = il4965_rs_alloc, .free = il4965_rs_free, .alloc_sta = il4965_rs_alloc_sta, .free_sta = il4965_rs_free_sta, #ifdef CONFIG_MAC80211_DEBUGFS .add_sta_debugfs = il4965_rs_add_debugfs, #endif }; int il4965_rate_control_register(void) { return ieee80211_rate_control_register(&rs_4965_ops); } void il4965_rate_control_unregister(void) { ieee80211_rate_control_unregister(&rs_4965_ops); }
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