tests: bluetooth: tester: Add support for L2CAP channels options

This allows for better control over IUT behaviour by Upper Tester.

PTS and TS require inconsistent behaviour in terms of how IUT should
return credits. Some tests require return on explicit UT request and
some require that IUT returns credits autonomously.

Signed-off-by: Szymon Janc <[email protected]>

Author: sjanc

tests/bluetooth/tester/src/bttester.h

@@ -739,14 +739,17 @@ struct l2cap_read_supported_commands_rp {
 	uint8_t data[0];
 } __packed;
 
+#define L2CAP_CONNECT_OPT_ECFC		0x01
+#define L2CAP_CONNECT_OPT_HOLD_CREDIT	0x02
+
 #define L2CAP_CONNECT			0x02
 struct l2cap_connect_cmd {
 	uint8_t address_type;
 	uint8_t address[6];
 	uint16_t psm;
 	uint16_t mtu;
 	uint8_t num;
-	uint8_t ecfc;
+	uint8_t options;
 } __packed;
 struct l2cap_connect_rp {
 	uint8_t num;

tests/bluetooth/tester/src/l2cap.c

@@ -35,6 +35,7 @@ static struct channel {
 	uint8_t chan_id; /* Internal number that identifies L2CAP channel. */
 	struct bt_l2cap_le_chan le;
 	bool in_use;
+	bool hold_credit;
 	struct net_buf *pending_credit;
 } channels[CHANNELS];
 
@@ -60,7 +61,7 @@ static int recv_cb(struct bt_l2cap_chan *l2cap_chan, struct net_buf *buf)
 	tester_send(BTP_SERVICE_ID_L2CAP, L2CAP_EV_DATA_RECEIVED,
 		    CONTROLLER_INDEX, recv_cb_buf, sizeof(*ev) + buf->len);
 
-	if (!chan->pending_credit) {
+	if (chan->hold_credit && !chan->pending_credit) {
 		/* no need for extra ref, as when returning EINPROGRESS user
 		 * becomes owner of the netbuf
 		 */
@@ -195,9 +196,10 @@ static void connect(uint8_t *data, uint16_t len)
 	uint16_t mtu = sys_le16_to_cpu(cmd->mtu);
 	uint8_t buf[sizeof(*rp) + CHANNELS];
 	uint8_t i = 0;
+	bool ecfc = cmd->options & L2CAP_CONNECT_OPT_ECFC;
 	int err;
 
-	if (cmd->num > CHANNELS || mtu > DATA_MTU_INITIAL) {
+	if (cmd->num == 0 || cmd->num > CHANNELS || mtu > DATA_MTU_INITIAL) {
 		goto fail;
 	}
 
@@ -217,20 +219,24 @@ static void connect(uint8_t *data, uint16_t len)
 		chan->le.rx.mtu = mtu;
 		rp->chan_id[i] = chan->chan_id;
 		allocated_channels[i] = &chan->le.chan;
+
+		chan->hold_credit = cmd->options & L2CAP_CONNECT_OPT_HOLD_CREDIT;
 	}
 
-	if (cmd->num == 1 && cmd->ecfc == 0) {
+	if (cmd->num == 1 && !ecfc) {
 		err = bt_l2cap_chan_connect(conn, &chan->le.chan, cmd->psm);
 		if (err < 0) {
 			goto fail;
 		}
-	} else if (cmd->ecfc == 1) {
+	} else if (ecfc) {
 #if defined(CONFIG_BT_L2CAP_ECRED)
 		err = bt_l2cap_ecred_chan_connect(conn, allocated_channels,
 							cmd->psm);
 		if (err < 0) {
 			goto fail;
 		}
+#else
+		goto fail;
 #endif
 	} else {
 		LOG_ERR("Invalid 'num' parameter value");
@@ -459,6 +465,10 @@ static void listen(uint8_t *data, uint16_t len)
 		goto fail;
 	}
 
+	if (cmd->psm == 0) {
+		goto fail;
+	}
+
 	server = get_free_server();
 	if (!server) {
 		goto fail;