iwlwifi: mvm: rs: repeat initial legacy rates in LQ table
Repeating the legacy rates avoids degrading quickly to
lower rates due to collisions which is common when doing
TCP Tx traffic in legacy.
This slightly improves TCP Tx throughput while working
in legacy in different scenarios.
Signed-off-by: Eyal Shapira <eyalx.shapira@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/constants.h b/drivers/net/wireless/iwlwifi/mvm/constants.h
index 7cd1de8..2d8e7e3 100644
--- a/drivers/net/wireless/iwlwifi/mvm/constants.h
+++ b/drivers/net/wireless/iwlwifi/mvm/constants.h
@@ -103,12 +103,13 @@
#define IWL_MVM_RS_RSSI_BASED_INIT_RATE 0
#define IWL_MVM_RS_DISABLE_MIMO 0
#define IWL_MVM_RS_NUM_TRY_BEFORE_ANT_TOGGLE 1
-#define IWL_MVM_RS_LEGACY_RETRIES_PER_RATE 1
#define IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE 2
#define IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE_TW 1
#define IWL_MVM_RS_INITIAL_MIMO_NUM_RATES 3
#define IWL_MVM_RS_INITIAL_SISO_NUM_RATES 3
-#define IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES 16
+#define IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES 2
+#define IWL_MVM_RS_INITIAL_LEGACY_RETRIES 2
+#define IWL_MVM_RS_SECONDARY_LEGACY_RETRIES 1
#define IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES 16
#define IWL_MVM_RS_SECONDARY_SISO_NUM_RATES 3
#define IWL_MVM_RS_SECONDARY_SISO_RETRIES 1
diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.c b/drivers/net/wireless/iwlwifi/mvm/rs.c
index 7ba6e5d..4747224 100644
--- a/drivers/net/wireless/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/rs.c
@@ -2862,12 +2862,13 @@
int index = *rs_table_index;
for (i = 0; i < num_rates && index < end; i++) {
- ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
- for (j = 0; j < num_retries && index < end; j++, index++)
+ for (j = 0; j < num_retries && index < end; j++, index++) {
+ ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
+ rate));
rs_table[index] = ucode_rate;
-
- if (toggle_ant)
- rs_toggle_antenna(valid_tx_ant, rate);
+ if (toggle_ant)
+ rs_toggle_antenna(valid_tx_ant, rate);
+ }
prev_rate_idx = rate->index;
bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
@@ -2875,7 +2876,7 @@
break;
}
- if (!bottom_reached)
+ if (!bottom_reached && !is_legacy(rate))
rate->index = prev_rate_idx;
*rs_table_index = index;
@@ -2925,7 +2926,7 @@
num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
} else {
num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
- num_retries = IWL_MVM_RS_LEGACY_RETRIES_PER_RATE;
+ num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
toggle_ant = true;
}
@@ -2941,7 +2942,7 @@
lq_cmd->mimo_delim = index;
} else if (is_legacy(&rate)) {
num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
- num_retries = IWL_MVM_RS_LEGACY_RETRIES_PER_RATE;
+ num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
} else {
WARN_ON_ONCE(1);
}
@@ -2955,7 +2956,7 @@
rs_get_lower_rate_down_column(lq_sta, &rate);
num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
- num_retries = IWL_MVM_RS_LEGACY_RETRIES_PER_RATE;
+ num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
num_rates, num_retries, valid_tx_ant,