Bluetooth: EWS: extended window size option support

Adds support for extended window size (EWS) config option. We enable EWS
feature in L2CAP Info RSP when hs enabled. EWS option is included in L2CAP
Config Req if tx_win (which is set via socket) bigger then standard default
value (63) && hs enabled && remote side supports EWS feature.

Using EWS selects extended control field in L2CAP.

Code partly based on Qualcomm and Atheros patches sent upstream a year ago.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

1 files changed, 6 insertions, 2 deletions

diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 08ad40bb5a46..51998ff6b8ca 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -32,6 +32,7 @@
 #define L2CAP_DEFAULT_MIN_MTU           48
 #define L2CAP_DEFAULT_FLUSH_TO          0xffff
 #define L2CAP_DEFAULT_TX_WINDOW         63
+#define L2CAP_DEFAULT_EXT_WINDOW        0x3FFF
 #define L2CAP_DEFAULT_MAX_TX            3
 #define L2CAP_DEFAULT_RETRANS_TO        2000    /* 2 seconds */
 #define L2CAP_DEFAULT_MONITOR_TO        12000   /* 12 seconds */
@@ -233,6 +234,7 @@ struct l2cap_conf_opt {
 #define L2CAP_CONF_QOS          0x03
 #define L2CAP_CONF_RFC          0x04
 #define L2CAP_CONF_FCS          0x05
+#define L2CAP_CONF_EWS          0x07
 
 #define L2CAP_CONF_MAX_SIZE     22
 
@@ -333,7 +335,7 @@ struct l2cap_chan {
 
         __u8            fcs;
 
-        __u8            tx_win;
+        __u16           tx_win;
         __u8            max_tx;
         __u16           retrans_timeout;
         __u16           monitor_timeout;
@@ -357,7 +359,7 @@ struct l2cap_chan {
         struct sk_buff  *sdu;
         struct sk_buff  *sdu_last_frag;
 
-        __u8            remote_tx_win;
+        __u16           remote_tx_win;
         __u8            remote_max_tx;
         __u16           remote_mps;
 
@@ -442,6 +444,7 @@ enum {
         CONF_CONNECT_PEND,
         CONF_NO_FCS_RECV,
         CONF_STATE2_DEVICE,
+        CONF_EWS_RECV,
 };
 
 #define L2CAP_CONF_MAX_CONF_REQ 2
@@ -465,6 +468,7 @@ enum {
         FLAG_FORCE_ACTIVE,
         FLAG_FORCE_RELIABLE,
         FLAG_FLUSHABLE,
+        FLAG_EXT_CTRL,
 };
 
 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))