From 4d30ee8247872b7eb7f38342d603963045ed8cba Mon Sep 17 00:00:00 2001 From: Eyal Shapira Date: Wed, 20 Nov 2013 01:45:38 +0200 Subject: [PATCH] iwlwifi: mvm: rs: improve debug prints Enable better tracking of different decisions made by the rate scale algorithm. Signed-off-by: Eyal Shapira Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/mvm/rs.c | 116 ++++++++++++++++++-------- 1 file changed, 83 insertions(+), 33 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.c b/drivers/net/wireless/iwlwifi/mvm/rs.c index a7efeb31c258..065520968d29 100644 --- a/drivers/net/wireless/iwlwifi/mvm/rs.c +++ b/drivers/net/wireless/iwlwifi/mvm/rs.c @@ -174,7 +174,7 @@ static void rs_fill_link_cmd(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 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); - +static const char *rs_pretty_lq_type(enum iwl_table_type type); #ifdef CONFIG_MAC80211_DEBUGFS static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, @@ -778,9 +778,6 @@ static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband, 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"); @@ -1499,8 +1496,10 @@ static int rs_move_mimo2_to_other(struct iwl_mvm *mvm, u8 update_search_tbl_counter = 0; int ret; - if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) + if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { + IWL_DEBUG_RATE(mvm, "BT COEX force switch to SISO A\n"); tbl->action = IWL_MIMO2_SWITCH_SISO_A; + } start_action = tbl->action; while (1) { @@ -1721,8 +1720,6 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, 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) || @@ -1758,14 +1755,9 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, /* 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) @@ -1809,6 +1801,9 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, index = lq_sta->max_rate_idx; update_lq = 1; window = &(tbl->win[index]); + IWL_DEBUG_RATE(mvm, + "Forcing user max rate %d\n", + index); goto lq_update; } @@ -1825,8 +1820,9 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, 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); + "(%s: %d): Test Window: succ %d total %d\n", + rs_pretty_lq_type(tbl->lq_type), + index, window->success_counter, window->counter); /* Can't calculate this yet; not enough history */ window->average_tpt = IWL_INVALID_VALUE; @@ -1854,7 +1850,8 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, * 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", + "SWITCHING TO NEW TABLE SR: %d " + "cur-tpt %d old-tpt %d\n", window->success_ratio, window->average_tpt, lq_sta->last_tpt); @@ -1868,7 +1865,8 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, /* 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", + "GOING BACK TO THE OLD TABLE: SR %d " + "cur-tpt %d old-tpt %d\n", window->success_ratio, window->average_tpt, lq_sta->last_tpt); @@ -1916,20 +1914,31 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, if (high != IWL_RATE_INVALID) high_tpt = tbl->win[high].average_tpt; + IWL_DEBUG_RATE(mvm, + "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", + rs_pretty_lq_type(tbl->lq_type), index, current_tpt, + sr, low, high, low_tpt, high_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"); + "decrease rate because of low SR\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) + if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) { + IWL_DEBUG_RATE(mvm, + "Good SR and no high rate measurement. " + "Increase rate\n"); scale_action = 1; - else if (low != IWL_RATE_INVALID) + } else if (low != IWL_RATE_INVALID) { + IWL_DEBUG_RATE(mvm, + "Remain in current rate\n"); scale_action = 0; + } } /* Both adjacent throughputs are measured, but neither one has better @@ -1937,8 +1946,12 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, else if ((low_tpt != IWL_INVALID_VALUE) && (high_tpt != IWL_INVALID_VALUE) && (low_tpt < current_tpt) && - (high_tpt < current_tpt)) + (high_tpt < current_tpt)) { + IWL_DEBUG_RATE(mvm, + "Both high and low are worse. " + "Maintain rate\n"); scale_action = 0; + } /* At least one adjacent rate's throughput is measured, * and may have better performance. */ @@ -1948,8 +1961,14 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, /* Higher rate has better throughput */ if (high_tpt > current_tpt && sr >= IWL_RATE_INCREASE_TH) { + IWL_DEBUG_RATE(mvm, + "Higher rate is better and good " + "SR. Increate rate\n"); scale_action = 1; } else { + IWL_DEBUG_RATE(mvm, + "Higher rate isn't better OR " + "no good SR. Maintain rate\n"); scale_action = 0; } @@ -1958,9 +1977,13 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, /* Lower rate has better throughput */ if (low_tpt > current_tpt) { IWL_DEBUG_RATE(mvm, - "decrease rate because of low tpt\n"); + "Lower rate is better. " + "Decrease rate\n"); scale_action = -1; } else if (sr >= IWL_RATE_INCREASE_TH) { + IWL_DEBUG_RATE(mvm, + "Lower rate isn't better and " + "good SR. Increase rate\n"); scale_action = 1; } } @@ -1970,12 +1993,17 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, * 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])))) + (current_tpt > (100 * tbl->expected_tpt[low])))) { + IWL_DEBUG_RATE(mvm, + "Sanity check failed. Maintain rate\n"); scale_action = 0; + } /* Force a search in case BT doesn't like us being in MIMO */ if (is_mimo(tbl->lq_type) && !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { + IWL_DEBUG_RATE(mvm, + "BT Coex forbids MIMO. Search for new config\n"); rs_stay_in_table(lq_sta, true); goto lq_update; } @@ -1986,6 +2014,9 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, if (low != IWL_RATE_INVALID) { update_lq = 1; index = low; + } else { + IWL_DEBUG_RATE(mvm, + "At the bottom rate. Can't decrease\n"); } break; @@ -1994,6 +2025,9 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, if (high != IWL_RATE_INVALID) { update_lq = 1; index = high; + } else { + IWL_DEBUG_RATE(mvm, + "At the top rate. Can't increase\n"); } break; @@ -2003,10 +2037,6 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, 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) @@ -2025,6 +2055,10 @@ lq_update: /* Save current throughput to compare with "search" throughput*/ lq_sta->last_tpt = current_tpt; + IWL_DEBUG_RATE(mvm, + "Start Search: update_lq %d done_search %d stay_in_tbl %d win->counter %d\n", + update_lq, done_search, lq_sta->stay_in_tbl, + window->counter); /* Select a new "search" modulation mode to try. * If one is found, set up the new "search" table. */ if (is_legacy(tbl->lq_type)) @@ -2047,8 +2081,11 @@ lq_update: index = iwl_hwrate_to_plcp_idx(tbl->current_rate); IWL_DEBUG_RATE(mvm, - "Switch current mcs: %X index: %d\n", - tbl->current_rate, index); + "Switch to SEARCH TABLE: " + "mcs %X (%s: %d)\n", + tbl->current_rate, + rs_pretty_lq_type(tbl->lq_type), + index); rs_fill_link_cmd(mvm, sta, lq_sta, tbl->current_rate); iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); } else { @@ -2169,8 +2206,6 @@ static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct iwl_lq_sta *lq_sta = mvm_sta; - 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; @@ -2554,7 +2589,6 @@ static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, >> 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, @@ -2562,8 +2596,6 @@ static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, ant_sel_tx, valid_tx_ant); IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n"); } - } else { - IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n"); } } @@ -2593,6 +2625,24 @@ static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, return count; } +static const char *rs_pretty_lq_type(enum iwl_table_type type) +{ + static const char * const lq_type[] = { + [LQ_NONE] = "NONE", + [LQ_LEGACY_A] = "LEGACY_A", + [LQ_LEGACY_G] = "LEGACY_G", + [LQ_HT_SISO] = "HT SISO", + [LQ_HT_MIMO2] = "HT MIMO", + [LQ_VHT_SISO] = "VHT SISO", + [LQ_VHT_MIMO2] = "VHT MIMO", + }; + + if (type < LQ_NONE || type >= LQ_MAX) + return "UNKNOWN"; + + return lq_type[type]; +} + static int rs_pretty_print_rate(char *buf, const u32 rate) { static const char * const ant_name[] = { -- 2.30.2