Bluetooth: Send SREJ frames when packets go missing

The ERTM specification lays out three scenarios for sending SREJ
frames to request retransmission of specific frames.  l2cap_send_srej
requests all frames up to a given txseq that are not already queued
for reassembly.  l2cap_send_srej_tail only requests the most recent
missing frame.  l2cap_send_srej_list resends SREJ frames for data that
was requested for resend but never received.

Signed-off-by: Mat Martineau <mathewm@codeaurora.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 26963a5..5823697 100644 (file)
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -2239,17 +2239,67 @@ int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
 
 static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
 {
-       /* Placeholder */
+       struct l2cap_ctrl control;
+       u16 seq;
+
+       BT_DBG("chan %p, txseq %d", chan, txseq);
+
+       memset(&control, 0, sizeof(control));
+       control.sframe = 1;
+       control.super = L2CAP_SUPER_SREJ;
+
+       for (seq = chan->expected_tx_seq; seq != txseq;
+            seq = __next_seq(chan, seq)) {
+               if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
+                       control.reqseq = seq;
+                       l2cap_send_sframe(chan, &control);
+                       l2cap_seq_list_append(&chan->srej_list, seq);
+               }
+       }
+
+       chan->expected_tx_seq = __next_seq(chan, txseq);
 }
 
 static void l2cap_send_srej_tail(struct l2cap_chan *chan)
 {
-       /* Placeholder */
+       struct l2cap_ctrl control;
+
+       BT_DBG("chan %p", chan);
+
+       if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
+               return;
+
+       memset(&control, 0, sizeof(control));
+       control.sframe = 1;
+       control.super = L2CAP_SUPER_SREJ;
+       control.reqseq = chan->srej_list.tail;
+       l2cap_send_sframe(chan, &control);
 }
 
 static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
 {
-       /* Placeholder */
+       struct l2cap_ctrl control;
+       u16 initial_head;
+       u16 seq;
+
+       BT_DBG("chan %p, txseq %d", chan, txseq);
+
+       memset(&control, 0, sizeof(control));
+       control.sframe = 1;
+       control.super = L2CAP_SUPER_SREJ;
+
+       /* Capture initial list head to allow only one pass through the list. */
+       initial_head = chan->srej_list.head;
+
+       do {
+               seq = l2cap_seq_list_pop(&chan->srej_list);
+               if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
+                       break;
+
+               control.reqseq = seq;
+               l2cap_send_sframe(chan, &control);
+               l2cap_seq_list_append(&chan->srej_list, seq);
+       } while (chan->srej_list.head != initial_head);
 }
 
 static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)