Bluetooth: Add basic constants for L2CAP ERTM support and use them

This adds the basic constants required to add support for L2CAP Enhanced
Retransmission feature.

Based on a patch from Nathan Holstein <nathan@lampreynetworks.com>

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

1 files changed, 42 insertions, 21 deletions

diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 300b63f0eec9..e919fca1072a 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -26,8 +26,13 @@
 #define __L2CAP_H
 
 /* L2CAP defaults */
-#define L2CAP_DEFAULT_MTU       672
-#define L2CAP_DEFAULT_FLUSH_TO  0xFFFF
+#define L2CAP_DEFAULT_MTU               672
+#define L2CAP_DEFAULT_FLUSH_TO          0xffff
+#define L2CAP_DEFAULT_RX_WINDOW         1
+#define L2CAP_DEFAULT_MAX_RECEIVE       1
+#define L2CAP_DEFAULT_RETRANS_TO        300    /* 300 milliseconds */
+#define L2CAP_DEFAULT_MONITOR_TO        1000   /* 1 second */
+#define L2CAP_DEFAULT_MAX_RX_APDU       0xfff7
 
 #define L2CAP_CONN_TIMEOUT      (40000) /* 40 seconds */
 #define L2CAP_INFO_TIMEOUT      (4000)  /*  4 seconds */
@@ -64,17 +69,29 @@ struct l2cap_conninfo {
 #define L2CAP_LM_SECURE         0x0020
 
 /* L2CAP command codes */
-#define L2CAP_COMMAND_REJ 0x01
-#define L2CAP_CONN_REQ    0x02
-#define L2CAP_CONN_RSP    0x03
-#define L2CAP_CONF_REQ    0x04
-#define L2CAP_CONF_RSP    0x05
-#define L2CAP_DISCONN_REQ 0x06
-#define L2CAP_DISCONN_RSP 0x07
-#define L2CAP_ECHO_REQ    0x08
-#define L2CAP_ECHO_RSP    0x09
-#define L2CAP_INFO_REQ    0x0a
-#define L2CAP_INFO_RSP    0x0b
+#define L2CAP_COMMAND_REJ       0x01
+#define L2CAP_CONN_REQ          0x02
+#define L2CAP_CONN_RSP          0x03
+#define L2CAP_CONF_REQ          0x04
+#define L2CAP_CONF_RSP          0x05
+#define L2CAP_DISCONN_REQ       0x06
+#define L2CAP_DISCONN_RSP       0x07
+#define L2CAP_ECHO_REQ          0x08
+#define L2CAP_ECHO_RSP          0x09
+#define L2CAP_INFO_REQ          0x0a
+#define L2CAP_INFO_RSP          0x0b
+
+/* L2CAP feature mask */
+#define L2CAP_FEAT_FLOWCTL      0x00000001
+#define L2CAP_FEAT_RETRANS      0x00000002
+#define L2CAP_FEAT_ERTM         0x00000008
+#define L2CAP_FEAT_STREAMING    0x00000010
+#define L2CAP_FEAT_FCS          0x00000020
+#define L2CAP_FEAT_FIXED_CHAN   0x00000080
+
+/* L2CAP checksum option */
+#define L2CAP_FCS_NONE          0x00
+#define L2CAP_FCS_CRC16         0x01
 
 /* L2CAP structures */
 struct l2cap_hdr {
@@ -113,16 +130,16 @@ struct l2cap_conn_rsp {
 #define L2CAP_CID_DYN_END       0xffff
 
 /* connect result */
-#define L2CAP_CR_SUCCESS    0x0000
-#define L2CAP_CR_PEND       0x0001
-#define L2CAP_CR_BAD_PSM    0x0002
-#define L2CAP_CR_SEC_BLOCK  0x0003
-#define L2CAP_CR_NO_MEM     0x0004
+#define L2CAP_CR_SUCCESS        0x0000
+#define L2CAP_CR_PEND           0x0001
+#define L2CAP_CR_BAD_PSM        0x0002
+#define L2CAP_CR_SEC_BLOCK      0x0003
+#define L2CAP_CR_NO_MEM         0x0004
 
 /* connect status */
-#define L2CAP_CS_NO_INFO      0x0000
-#define L2CAP_CS_AUTHEN_PEND  0x0001
-#define L2CAP_CS_AUTHOR_PEND  0x0002
+#define L2CAP_CS_NO_INFO        0x0000
+#define L2CAP_CS_AUTHEN_PEND    0x0001
+#define L2CAP_CS_AUTHOR_PEND    0x0002
 
 struct l2cap_conf_req {
         __le16     dcid;
@@ -150,11 +167,13 @@ struct l2cap_conf_opt {
 #define L2CAP_CONF_OPT_SIZE     2
 
 #define L2CAP_CONF_HINT         0x80
+#define L2CAP_CONF_MASK         0x7f
 
 #define L2CAP_CONF_MTU          0x01
 #define L2CAP_CONF_FLUSH_TO     0x02
 #define L2CAP_CONF_QOS          0x03
 #define L2CAP_CONF_RFC          0x04
+#define L2CAP_CONF_FCS          0x05
 
 #define L2CAP_CONF_MAX_SIZE     22
 
@@ -170,6 +189,8 @@ struct l2cap_conf_rfc {
 #define L2CAP_MODE_BASIC        0x00
 #define L2CAP_MODE_RETRANS      0x01
 #define L2CAP_MODE_FLOWCTL      0x02
+#define L2CAP_MODE_ERTM         0x03
+#define L2CAP_MODE_STREAM       0x04
 
 struct l2cap_disconn_req {
         __le16     dcid;