[PATCH v2 2/6] btio: Add mode to for Enhanced Credit Mode

[Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx>]

From: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>

This adds BT_IO_MODE_EXT_FLOWCTL which directly maps to
L2CAP_MODE_EXT_FLOWCTL.
---
 btio/btio.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++------
 btio/btio.h |  3 ++-
 2 files changed, 55 insertions(+), 7 deletions(-)

diff --git a/btio/btio.c b/btio/btio.c
index db37b99da..e7b4db16b 100644
--- a/btio/btio.c
+++ b/btio/btio.c
@@ -630,18 +630,34 @@ static gboolean set_le_imtu(int sock, uint16_t imtu, GError **err)
 	return TRUE;
 }
 
+static gboolean set_le_mode(int sock, uint8_t mode, GError **err)
+{
+	if (setsockopt(sock, SOL_BLUETOOTH, BT_MODE, &mode,
+						sizeof(mode)) < 0) {
+		ERROR_FAILED(err, "setsockopt(BT_MODE)", errno);
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
 static gboolean l2cap_set(int sock, uint8_t src_type, int sec_level,
 				uint16_t imtu, uint16_t omtu, uint8_t mode,
 				int master, int flushable, uint32_t priority,
 				GError **err)
 {
 	if (imtu || omtu || mode) {
-		gboolean ret;
+		gboolean ret = FALSE;
 
 		if (src_type == BDADDR_BREDR)
 			ret = set_l2opts(sock, imtu, omtu, mode, err);
-		else
-			ret = set_le_imtu(sock, imtu, err);
+		else {
+			if (imtu)
+				ret = set_le_imtu(sock, imtu, err);
+
+			if (ret && mode)
+				ret = set_le_mode(sock, mode, err);
+		}
 
 		if (!ret)
 			return ret;
@@ -980,6 +996,30 @@ static int get_phy(int sock, uint32_t *phy)
 	return 0;
 }
 
+static int get_le_imtu(int sock, uint16_t *mtu)
+{
+	socklen_t len;
+
+	len = sizeof(*mtu);
+
+	if (getsockopt(sock, SOL_BLUETOOTH, BT_RCVMTU, mtu, &len) < 0)
+		return -errno;
+
+	return 0;
+}
+
+static int get_le_mode(int sock, uint8_t *mode)
+{
+	socklen_t len;
+
+	len = sizeof(*mode);
+
+	if (getsockopt(sock, SOL_BLUETOOTH, BT_MODE, mode, &len) < 0)
+		return -errno;
+
+	return 0;
+}
+
 static gboolean l2cap_get(int sock, GError **err, BtIOOption opt1,
 								va_list args)
 {
@@ -999,10 +1039,11 @@ static gboolean l2cap_get(int sock, GError **err, BtIOOption opt1,
 	memset(&l2o, 0, sizeof(l2o));
 
 	if (src.l2_bdaddr_type != BDADDR_BREDR) {
-		len = sizeof(l2o.imtu);
-		if (getsockopt(sock, SOL_BLUETOOTH, BT_RCVMTU,
-						&l2o.imtu, &len) == 0)
+		if (get_le_imtu(sock, &l2o.imtu) == 0) {
+			/* Older kernels may not support BT_MODE */
+			get_le_mode(sock, &l2o.mode);
 			goto parse_opts;
+		}
 
 		/* Non-LE CoC enabled kernels will return one of these
 		 * in which case we need to fall back to L2CAP_OPTIONS.
@@ -1644,6 +1685,12 @@ GIOChannel *bt_io_connect(BtIOConnect connect, gpointer user_data,
 
 	sock = g_io_channel_unix_get_fd(io);
 
+	/* Use DEFER_SETUP when connecting using Ext-Flowctl */
+	if (opts.mode == BT_IO_MODE_EXT_FLOWCTL && opts.defer) {
+		setsockopt(sock, SOL_BLUETOOTH, BT_DEFER_SETUP, &opts.defer,
+							sizeof(opts.defer));
+	}
+
 	switch (opts.type) {
 	case BT_IO_L2CAP:
 		err = l2cap_connect(sock, &opts.dst, opts.dst_type,
diff --git a/btio/btio.h b/btio/btio.h
index 41a017acb..5ebfb85c6 100644
--- a/btio/btio.h
+++ b/btio/btio.h
@@ -71,7 +71,8 @@ typedef enum {
 	BT_IO_MODE_RETRANS,
 	BT_IO_MODE_FLOWCTL,
 	BT_IO_MODE_ERTM,
-	BT_IO_MODE_STREAMING
+	BT_IO_MODE_STREAMING,
+	BT_IO_MODE_EXT_FLOWCTL = 0x81
 } BtIOMode;
 
 typedef void (*BtIOConfirm)(GIOChannel *io, gpointer user_data);
-- 
2.21.1