wifi: mac80211: get tx power per link

ML interfaces can have multiple affiliated links to it and
hence there is a need to report tx power of specified link
rather deflink.

Add changes to report tx power of requested link from mac80211,
also pass link id as an argument in get_tx_power op so that supported
drivers can use it to report link's tx power.

Co-developed-by: Aaradhana Sahu <quic_aarasahu@quicinc.com>
Signed-off-by: Aaradhana Sahu <quic_aarasahu@quicinc.com>
Signed-off-by: Rameshkumar Sundaram <quic_ramess@quicinc.com>
Link: https://patch.msgid.link/20241125083217.216095-3-quic_ramess@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 21 insertions, 11 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index b2410a913556..2fa594fb6c1a 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3195,15 +3195,22 @@ static int ieee80211_get_tx_power(struct wiphy *wiphy,
 {
 	struct ieee80211_local *local = wiphy_priv(wiphy);
 	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
+	struct ieee80211_link_data *link_data;
 
 	if (local->ops->get_txpower &&
 	    (sdata->flags & IEEE80211_SDATA_IN_DRIVER))
-		return drv_get_txpower(local, sdata, dbm);
+		return drv_get_txpower(local, sdata, link_id, dbm);
 
-	if (local->emulate_chanctx)
+	if (local->emulate_chanctx) {
 		*dbm = local->hw.conf.power_level;
-	else
-		*dbm = sdata->vif.bss_conf.txpower;
+	} else {
+		link_data = wiphy_dereference(wiphy, sdata->link[link_id]);
+
+		if (link_data)
+			*dbm = link_data->conf->txpower;
+		else
+			return -ENOLINK;
+	}
 
 	/* INT_MIN indicates no power level was set yet */
 	if (*dbm == INT_MIN)
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index edd1e4d4ad9d..c64531e0a60e 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -1273,7 +1273,8 @@ static inline u32 drv_get_expected_throughput(struct ieee80211_local *local,
 }
 
 static inline int drv_get_txpower(struct ieee80211_local *local,
-				  struct ieee80211_sub_if_data *sdata, int *dbm)
+				  struct ieee80211_sub_if_data *sdata,
+				  unsigned int link_id, int *dbm)
 {
 	int ret;
 
@@ -1283,8 +1284,8 @@ static inline int drv_get_txpower(struct ieee80211_local *local,
 	if (!local->ops->get_txpower)
 		return -EOPNOTSUPP;
 
-	ret = local->ops->get_txpower(&local->hw, &sdata->vif, dbm);
-	trace_drv_get_txpower(local, sdata, *dbm, ret);
+	ret = local->ops->get_txpower(&local->hw, &sdata->vif, link_id, dbm);
+	trace_drv_get_txpower(local, sdata, link_id, *dbm, ret);
 
 	return ret;
 }
diff --git a/net/mac80211/trace.h b/net/mac80211/trace.h
index 7a4985fc2b16..dc35fed7e9b0 100644
--- a/net/mac80211/trace.h
+++ b/net/mac80211/trace.h
@@ -2173,13 +2173,14 @@ DEFINE_EVENT(chanswitch_evt, drv_channel_switch_rx_beacon,
 TRACE_EVENT(drv_get_txpower,
 	TP_PROTO(struct ieee80211_local *local,
 		 struct ieee80211_sub_if_data *sdata,
-		 int dbm, int ret),
+		 unsigned int link_id, int dbm, int ret),
 
-	TP_ARGS(local, sdata, dbm, ret),
+	TP_ARGS(local, sdata, link_id, dbm, ret),
 
 	TP_STRUCT__entry(
 		LOCAL_ENTRY
 		VIF_ENTRY
+		__field(unsigned int, link_id)
 		__field(int, dbm)
 		__field(int, ret)
 	),
@@ -2187,13 +2188,14 @@ TRACE_EVENT(drv_get_txpower,
 	TP_fast_assign(
 		LOCAL_ASSIGN;
 		VIF_ASSIGN;
+		__entry->link_id = link_id;
 		__entry->dbm = dbm;
 		__entry->ret = ret;
 	),
 
 	TP_printk(
-		LOCAL_PR_FMT VIF_PR_FMT " dbm:%d ret:%d",
-		LOCAL_PR_ARG, VIF_PR_ARG, __entry->dbm, __entry->ret
+		LOCAL_PR_FMT VIF_PR_FMT " link_id:%d dbm:%d ret:%d",
+		LOCAL_PR_ARG, VIF_PR_ARG, __entry->link_id, __entry->dbm, __entry->ret
 	)
 );