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authorJohan Hedberg <johan.hedberg@intel.com>2013-12-05 09:43:34 +0200
committerMarcel Holtmann <marcel@holtmann.org>2013-12-05 07:05:34 -0800
commitb1c325c23d75c5e27607fdcc89bc9bf80af0ba9b (patch)
tree22a372709ad13b3d059ed3770df375b56bd5f86f /net/bluetooth
parent1f435424ce2c93c31c3887ec67e3afb6056f18f6 (diff)
downloadblackbird-op-linux-b1c325c23d75c5e27607fdcc89bc9bf80af0ba9b.tar.gz
blackbird-op-linux-b1c325c23d75c5e27607fdcc89bc9bf80af0ba9b.zip
Bluetooth: Implement returning of LE L2CAP credits
We should return credits to the remote side whenever they fall below a certain level (in our case under half of the initially given amount). Signed-off-by: Johan Hedberg <johan.hedberg@intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth')
-rw-r--r--net/bluetooth/l2cap_core.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index fe55162947f8..4e0e2bedd457 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -6610,6 +6610,32 @@ drop:
return 0;
}
+static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
+{
+ struct l2cap_conn *conn = chan->conn;
+ struct l2cap_le_credits pkt;
+ u16 return_credits;
+
+ /* We return more credits to the sender only after the amount of
+ * credits falls below half of the initial amount.
+ */
+ if (chan->rx_credits >= (L2CAP_LE_MAX_CREDITS + 1) / 2)
+ return;
+
+ return_credits = L2CAP_LE_MAX_CREDITS - chan->rx_credits;
+
+ BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
+
+ chan->rx_credits += return_credits;
+
+ pkt.cid = cpu_to_le16(chan->scid);
+ pkt.credits = cpu_to_le16(return_credits);
+
+ chan->ident = l2cap_get_ident(conn);
+
+ l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
+}
+
static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
struct sk_buff *skb)
{
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