Bluetooth: Add the l2cap_seq_list structure for tracking frames
A sequence list is a data structure used to track frames that need to
be retransmitted, and frames that have been requested for
retransmission by the remote device. It can compactly represent a
list of sequence numbers within the ERTM transmit window. Memory for
the list is allocated once at connection time, and common operations
in ERTM are O(1).
Signed-off-by: Mat Martineau <mathewm@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index a756c24..e331654 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -407,6 +407,16 @@
#define L2CAP_CONN_PARAM_REJECTED 0x0001
/* ----- L2CAP channels and connections ----- */
+struct l2cap_seq_list {
+ __u16 head;
+ __u16 tail;
+ __u16 mask;
+ __u16 *list;
+};
+
+#define L2CAP_SEQ_LIST_CLEAR 0xFFFF
+#define L2CAP_SEQ_LIST_TAIL 0x8000
+
struct srej_list {
__u16 tx_seq;
struct list_head list;
@@ -501,6 +511,8 @@
struct sk_buff *tx_send_head;
struct sk_buff_head tx_q;
struct sk_buff_head srej_q;
+ struct l2cap_seq_list srej_list;
+ struct l2cap_seq_list retrans_list;
struct list_head srej_l;
struct list_head list;