wifi: cfg80211/mac80211: Add support to get radio index

Currently, per-radio attributes are set on per-phy basis, i.e., all the
radios present in a wiphy will take attributes values sent from user. But
each radio in a wiphy can get different values from userspace based on
its requirement.

To extend support to set per-radio attributes, add support to get radio
index from userspace. Add an NL attribute - NL80211_ATTR_WIPHY_RADIO_INDEX,
to get user specified radio index for which attributes should be changed.
Pass this to individual drivers, so that the drivers can use this radio
index to change per-radio attributes when necessary. Currently, per-radio
attributes identified are:
NL80211_ATTR_WIPHY_TX_POWER_LEVEL
NL80211_ATTR_WIPHY_ANTENNA_TX
NL80211_ATTR_WIPHY_ANTENNA_RX
NL80211_ATTR_WIPHY_RETRY_SHORT
NL80211_ATTR_WIPHY_RETRY_LONG
NL80211_ATTR_WIPHY_FRAG_THRESHOLD
NL80211_ATTR_WIPHY_RTS_THRESHOLD
NL80211_ATTR_WIPHY_COVERAGE_CLASS
NL80211_ATTR_TXQ_LIMIT
NL80211_ATTR_TXQ_MEMORY_LIMIT
NL80211_ATTR_TXQ_QUANTUM

By default, the radio index is set to -1. This means the attribute should
be treated as a global configuration. If the user has not specified any
index, then the radio index passed to individual drivers would be -1. This
would indicate that the attribute applies to all radios in that wiphy.

Signed-off-by: Roopni Devanathan <quic_rdevanat@quicinc.com>
Link: https://patch.msgid.link/20250615082312.619639-2-quic_rdevanat@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 20 insertions, 6 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 9ef618baac9e..b40978549790 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -854,6 +854,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
 	[NL80211_ATTR_MLO_RECONF_REM_LINKS] = { .type = NLA_U16 },
 	[NL80211_ATTR_EPCS] = { .type = NLA_FLAG },
 	[NL80211_ATTR_ASSOC_MLD_EXT_CAPA_OPS] = { .type = NLA_U16 },
+	[NL80211_ATTR_WIPHY_RADIO_INDEX] = { .type = NLA_U8 },
 };
 
 /* policy for the key attributes */
@@ -2639,7 +2640,7 @@ static int nl80211_send_wiphy(struct cfg80211_registered_device *rdev,
 			u32 tx_ant = 0, rx_ant = 0;
 			int res;
 
-			res = rdev_get_antenna(rdev, &tx_ant, &rx_ant);
+			res = rdev_get_antenna(rdev, -1, &tx_ant, &rx_ant);
 			if (!res) {
 				if (nla_put_u32(msg,
 						NL80211_ATTR_WIPHY_ANTENNA_TX,
@@ -3620,6 +3621,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 	u32 frag_threshold = 0, rts_threshold = 0;
 	u8 coverage_class = 0;
 	u32 txq_limit = 0, txq_memory_limit = 0, txq_quantum = 0;
+	int radio_idx = -1;
 
 	rtnl_lock();
 	/*
@@ -3670,6 +3672,17 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 	if (result)
 		return result;
 
+	if (info->attrs[NL80211_ATTR_WIPHY_RADIO_INDEX]) {
+		/* Radio idx is not expected for non-multi radio wiphy */
+		if (rdev->wiphy.n_radio <= 0)
+			return -EINVAL;
+
+		radio_idx = nla_get_u8(
+				info->attrs[NL80211_ATTR_WIPHY_RADIO_INDEX]);
+		if (radio_idx >= rdev->wiphy.n_radio)
+			return -EINVAL;
+	}
+
 	if (info->attrs[NL80211_ATTR_WIPHY_TXQ_PARAMS]) {
 		struct ieee80211_txq_params txq_params;
 		struct nlattr *tb[NL80211_TXQ_ATTR_MAX + 1];
@@ -3759,7 +3772,8 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 			mbm = nla_get_u32(info->attrs[idx]);
 		}
 
-		result = rdev_set_tx_power(rdev, txp_wdev, type, mbm);
+		result = rdev_set_tx_power(rdev, txp_wdev, radio_idx, type,
+					   mbm);
 		if (result)
 			return result;
 	}
@@ -3785,7 +3799,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 		tx_ant = tx_ant & rdev->wiphy.available_antennas_tx;
 		rx_ant = rx_ant & rdev->wiphy.available_antennas_rx;
 
-		result = rdev_set_antenna(rdev, tx_ant, rx_ant);
+		result = rdev_set_antenna(rdev, radio_idx, tx_ant, rx_ant);
 		if (result)
 			return result;
 	}
@@ -3911,7 +3925,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 		if (changed & WIPHY_PARAM_TXQ_QUANTUM)
 			rdev->wiphy.txq_quantum = txq_quantum;
 
-		result = rdev_set_wiphy_params(rdev, changed);
+		result = rdev_set_wiphy_params(rdev, radio_idx, changed);
 		if (result) {
 			rdev->wiphy.retry_short = old_retry_short;
 			rdev->wiphy.retry_long = old_retry_long;
@@ -4012,7 +4026,7 @@ static int nl80211_send_iface(struct sk_buff *msg, u32 portid, u32 seq, int flag
 	if (rdev->ops->get_tx_power && !wdev->valid_links) {
 		int dbm, ret;
 
-		ret = rdev_get_tx_power(rdev, wdev, 0, &dbm);
+		ret = rdev_get_tx_power(rdev, wdev, -1, 0, &dbm);
 		if (ret == 0 &&
 		    nla_put_u32(msg, NL80211_ATTR_WIPHY_TX_POWER_LEVEL,
 				DBM_TO_MBM(dbm)))
@@ -4084,7 +4098,7 @@ static int nl80211_send_iface(struct sk_buff *msg, u32 portid, u32 seq, int flag
 			if (rdev->ops->get_tx_power) {
 				int dbm, ret;
 
-				ret = rdev_get_tx_power(rdev, wdev, link_id, &dbm);
+				ret = rdev_get_tx_power(rdev, wdev, -1, link_id, &dbm);
 				if (ret == 0 &&
 				    nla_put_u32(msg, NL80211_ATTR_WIPHY_TX_POWER_LEVEL,
 						DBM_TO_MBM(dbm)))