[PATCH 2/2] iw: Add support to set per-radio Tx power config in multi-radio wiphy

[Roopni Devanathan <quic_rdevanat@xxxxxxxxxxx>]

From: Rameshkumar Sundaram <quic_ramess@xxxxxxxxxxx>

Currently, setting transmit power changes the transmit power for all radios
in a wiphy. But different radios in a wiphy can have different transmit
power requirements. Modify the iw command to handle this. This will
ensure that the legacy userspace will interact with traditional drivers
as well as multi-radio wiphy drivers.

In order to be able to set transmit power for a particular radio from
user space, without disturbing the other radios in a wiphy, pass the
radio id for which the transmit power needs to be changed and its
transmit power value. The valid radio id values can be checked in
iw phy#XXX info, under "Supported wiphy radios".

Signed-off-by: Rameshkumar Sundaram <quic_ramess@xxxxxxxxxxx>
Signed-off-by: Roopni Devanathan <quic_rdevanat@xxxxxxxxxxx>
---
 phy.c | 39 ++++++++++++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 11 deletions(-)

diff --git a/phy.c b/phy.c
index 890966d..bd7194d 100644
--- a/phy.c
+++ b/phy.c
@@ -727,20 +727,37 @@ static int handle_txpower(struct nl80211_state *state,
 			  enum id_input id)
 {
 	enum nl80211_tx_power_setting type;
-	int mbm;
+	int mbm, i = 0;
 
 	/* get the required args */
-	if (argc != 1 && argc != 2)
+	if (argc > 4)
 		return 1;
 
-	if (!strcmp(argv[0], "auto"))
+	/* check if radio idx is provided */
+	if (argc >= 2 && !strcmp(argv[0], "radio")) {
+		unsigned int radio_id;
+		char *endptr;
+
+		radio_id = strtoul(argv[1], &endptr, 10);
+		if (*endptr)
+			return 1;
+
+		NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_RADIO_INDEX, radio_id);
+		i = 2;
+	}
+
+	/* check the required args without radio id */
+	if ((argc - i) != 1 && (argc - i) != 2)
+		return 1;
+
+	if (!strcmp(argv[i], "auto")) {
 		type = NL80211_TX_POWER_AUTOMATIC;
-	else if (!strcmp(argv[0], "fixed"))
+	} else if (!strcmp(argv[i], "fixed")) {
 		type = NL80211_TX_POWER_FIXED;
-	else if (!strcmp(argv[0], "limit"))
+	} else if (!strcmp(argv[i], "limit")) {
 		type = NL80211_TX_POWER_LIMITED;
-	else {
-		printf("Invalid parameter: %s\n", argv[0]);
+	} else {
+		printf("Invalid parameter: %s\n", argv[i]);
 		return 2;
 	}
 
@@ -748,16 +765,16 @@ static int handle_txpower(struct nl80211_state *state,
 
 	if (type != NL80211_TX_POWER_AUTOMATIC) {
 		char *endptr;
-		if (argc != 2) {
+		if ((argc - i) != 2) {
 			printf("Missing TX power level argument.\n");
 			return 2;
 		}
 
-		mbm = strtol(argv[1], &endptr, 10);
+		mbm = strtol(argv[++i], &endptr, 10);
 		if (*endptr)
 			return 2;
 		NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_TX_POWER_LEVEL, mbm);
-	} else if (argc != 1)
+	} else if ((argc - i) != 1)
 		return 1;
 
 	return 0;
@@ -765,7 +782,7 @@ static int handle_txpower(struct nl80211_state *state,
  nla_put_failure:
 	return -ENOBUFS;
 }
-COMMAND(set, txpower, "<auto|fixed|limit> [<tx power in mBm>]",
+COMMAND(set, txpower, "[radio <radio idx>] <auto|fixed|limit> [<tx power in mBm>]",
 	NL80211_CMD_SET_WIPHY, 0, CIB_PHY, handle_txpower,
 	"Specify transmit power level and setting type.");
 COMMAND(set, txpower, "<auto|fixed|limit> [<tx power in mBm>]",
-- 
2.34.1