iwlwifi: mvm: add debugfs file for fixed reduced tx power

Allow fixing the tx power reduction through debugfs
file.

The change doesn't take affect immediately, but
will be considered the next time tpc is evaluated.
Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/mvm/rs.c

@@ -1863,6 +1863,15 @@ static bool rs_tpc_perform(struct iwl_mvm *mvm,
 	int weak, strong;
 	int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
 
+#ifdef CONFIG_MAC80211_DEBUGFS
+	if (lq_sta->dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
+		IWL_DEBUG_RATE(mvm, "fixed tpc: %d",
+			       lq_sta->dbg_fixed_txp_reduction);
+		lq_sta->lq.reduced_tpc = lq_sta->dbg_fixed_txp_reduction;
+		return cur != lq_sta->dbg_fixed_txp_reduction;
+	}
+#endif
+
 	rcu_read_lock();
 	chanctx_conf = rcu_dereference(vif->chanctx_conf);
 	if (WARN_ON(!chanctx_conf))
@@ -2613,6 +2622,7 @@ void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 	lq_sta->is_agg = 0;
 #ifdef CONFIG_MAC80211_DEBUGFS
 	lq_sta->dbg_fixed_rate = 0;
+	lq_sta->dbg_fixed_txp_reduction = TPC_INVALID;
 #endif
 #ifdef CONFIG_IWLWIFI_DEBUGFS
 	iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
@@ -3076,6 +3086,9 @@ static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
 	lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
 		debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
 				  &lq_sta->tx_agg_tid_en);
+	lq_sta->rs_sta_dbgfs_reduced_txp_file =
+		debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
+				  &lq_sta->dbg_fixed_txp_reduction);
 }
 
 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
@@ -3084,6 +3097,7 @@ static void rs_remove_debugfs(void *mvm, void *mvm_sta)
 	debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
 	debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
 	debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
+	debugfs_remove(lq_sta->rs_sta_dbgfs_reduced_txp_file);
 }
 #endif
 

drivers/net/wireless/iwlwifi/mvm/rs.h

@@ -336,7 +336,9 @@ struct iwl_lq_sta {
 	struct dentry *rs_sta_dbgfs_scale_table_file;
 	struct dentry *rs_sta_dbgfs_stats_table_file;
 	struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
+	struct dentry *rs_sta_dbgfs_reduced_txp_file;
 	u32 dbg_fixed_rate;
+	u8 dbg_fixed_txp_reduction;
 #endif
 	struct iwl_mvm *drv;