Bluetooth: Add module option to enable L2CAP ERTM support

Since the Enhanced Retransmission mode for L2CAP is still under heavy
development disable it by default and provide a module option to enable
it manually for testing.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 10 insertions, 2 deletions

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index bd0a4c1bced0..810a3c1a4188 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -50,7 +50,9 @@
 #include <net/bluetooth/hci_core.h>
 #include <net/bluetooth/l2cap.h>
 
-#define VERSION "2.13"
+#define VERSION "2.14"
+
+static int enable_ertm = 0;
 
 static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
 static u8 l2cap_fixed_chan[8] = { 0x02, };
@@ -2205,10 +2207,13 @@ static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cm
 
         if (type == L2CAP_IT_FEAT_MASK) {
                 u8 buf[8];
+                u32 feat_mask = l2cap_feat_mask;
                 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
                 rsp->type   = cpu_to_le16(L2CAP_IT_FEAT_MASK);
                 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
-                put_unaligned(cpu_to_le32(l2cap_feat_mask), (__le32 *) rsp->data);
+                if (enable_ertm)
+                        feat_mask |= L2CAP_FEAT_ERTM;
+                put_unaligned(cpu_to_le32(feat_mask), (__le32 *) rsp->data);
                 l2cap_send_cmd(conn, cmd->ident,
                                         L2CAP_INFO_RSP, sizeof(buf), buf);
         } else if (type == L2CAP_IT_FIXED_CHAN) {
@@ -2828,6 +2833,9 @@ EXPORT_SYMBOL(l2cap_load);
 module_init(l2cap_init);
 module_exit(l2cap_exit);
 
+module_param(enable_ertm, bool, 0644);
+MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode");
+
 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
 MODULE_VERSION(VERSION);