From 4e4b815c08ce6257c15cede80b29247f1b88de04 Mon Sep 17 00:00:00 2001 From: Eyal Shapira Date: Wed, 11 Dec 2013 00:55:36 +0200 Subject: [PATCH] iwlwifi: mvm: rs: refactor rate scale action decision Extract the scale action decision to a different function in preparation of modifying it. While at it also convert the scale action values from hardcoded values to a clear enum. Signed-off-by: Eyal Shapira Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/mvm/rs.c | 186 ++++++++++++++------------ 1 file changed, 103 insertions(+), 83 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.c b/drivers/net/wireless/iwlwifi/mvm/rs.c index 6d0bd45b0791..62b29d7f80f0 100644 --- a/drivers/net/wireless/iwlwifi/mvm/rs.c +++ b/drivers/net/wireless/iwlwifi/mvm/rs.c @@ -130,6 +130,12 @@ static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ }; +enum rs_action { + RS_ACTION_STAY = 0, + RS_ACTION_DOWNSCALE = -1, + RS_ACTION_UPSCALE = 1, +}; + enum rs_column_mode { RS_INVALID = 0, RS_LEGACY, @@ -1616,6 +1622,97 @@ err: return -1; } +static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, + struct iwl_scale_tbl_info *tbl, + s32 sr, int low, int high, + int current_tpt, + int low_tpt, int high_tpt) +{ + enum rs_action action = RS_ACTION_STAY; + + /* Too many failures, decrease rate */ + if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) { + IWL_DEBUG_RATE(mvm, + "decrease rate because of low SR\n"); + action = RS_ACTION_DOWNSCALE; + /* 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) { + IWL_DEBUG_RATE(mvm, + "Good SR and no high rate measurement. " + "Increase rate\n"); + action = RS_ACTION_UPSCALE; + } else if (low != IWL_RATE_INVALID) { + IWL_DEBUG_RATE(mvm, + "Remain in current rate\n"); + action = RS_ACTION_STAY; + } + } + + /* 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)) { + IWL_DEBUG_RATE(mvm, + "Both high and low are worse. " + "Maintain rate\n"); + action = RS_ACTION_STAY; + } + + /* 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) { + IWL_DEBUG_RATE(mvm, + "Higher rate is better and good " + "SR. Increate rate\n"); + action = RS_ACTION_UPSCALE; + } else { + IWL_DEBUG_RATE(mvm, + "Higher rate isn't better OR " + "no good SR. Maintain rate\n"); + action = RS_ACTION_STAY; + } + + /* 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, + "Lower rate is better. " + "Decrease rate\n"); + action = RS_ACTION_DOWNSCALE; + } else if (sr >= IWL_RATE_INCREASE_TH) { + IWL_DEBUG_RATE(mvm, + "Lower rate isn't better and " + "good SR. Increase rate\n"); + action = RS_ACTION_UPSCALE; + } + } + } + + /* Sanity check; asked for decrease, but success rate or throughput + * has been good at old rate. Don't change it. + */ + if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID) && + ((sr > IWL_RATE_HIGH_TH) || + (current_tpt > (100 * tbl->expected_tpt[low])))) { + IWL_DEBUG_RATE(mvm, + "Sanity check failed. Maintain rate\n"); + action = RS_ACTION_STAY; + } + + return action; +} /* * Do rate scaling and search for new modulation mode. @@ -1636,7 +1733,7 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, int low_tpt = IWL_INVALID_VALUE; int high_tpt = IWL_INVALID_VALUE; u32 fail_count; - s8 scale_action = 0; + enum rs_action scale_action = RS_ACTION_STAY; u16 rate_mask; u8 update_lq = 0; struct iwl_scale_tbl_info *tbl, *tbl1; @@ -1830,85 +1927,8 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, rs_pretty_lq_type(rate->type), index, current_tpt, sr, low, high, low_tpt, high_tpt); - scale_action = 0; - - /* Too many failures, decrease rate */ - if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) { - IWL_DEBUG_RATE(mvm, - "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) { - IWL_DEBUG_RATE(mvm, - "Good SR and no high rate measurement. " - "Increase rate\n"); - scale_action = 1; - } 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 - * 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)) { - 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. */ - 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) { - 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; - } - - /* 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, - "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; - } - } - } - - /* 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])))) { - IWL_DEBUG_RATE(mvm, - "Sanity check failed. Maintain rate\n"); - scale_action = 0; - } + scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, + current_tpt, low_tpt, high_tpt); /* Force a search in case BT doesn't like us being in MIMO */ if (is_mimo(rate) && @@ -1920,7 +1940,7 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, } switch (scale_action) { - case -1: + case RS_ACTION_DOWNSCALE: /* Decrease starting rate, update uCode's rate table */ if (low != IWL_RATE_INVALID) { update_lq = 1; @@ -1931,7 +1951,7 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, } break; - case 1: + case RS_ACTION_UPSCALE: /* Increase starting rate, update uCode's rate table */ if (high != IWL_RATE_INVALID) { update_lq = 1; @@ -1942,7 +1962,7 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm, } break; - case 0: + case RS_ACTION_STAY: /* No change */ default: break; -- 2.39.5