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Commit b1c325c2 authored by Johan Hedberg's avatar Johan Hedberg Committed by Marcel Holtmann
Browse files

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: default avatarJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 1f435424

net/bluetooth/l2cap_core.c

+26 −0
Original line number Diff line number Diff line
@@ -6610,6 +6610,32 @@ static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) 
	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)

{