From b1c325c23d75c5e27607fdcc89bc9bf80af0ba9b Mon Sep 17 00:00:00 2001 From: Johan Hedberg Date: Thu, 5 Dec 2013 09:43:34 +0200 Subject: [PATCH] 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 Signed-off-by: Marcel Holtmann --- net/bluetooth/l2cap_core.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) 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) { -- 2.34.1