From e31f76337257616aca0ea15abee271513b17426c Mon Sep 17 00:00:00 2001 From: Mat Martineau Date: Thu, 17 May 2012 20:53:41 -0700 Subject: [PATCH] Bluetooth: Update l2cap_send_i_or_rr_or_rnr to fit the spec better This action now exactly matches what is defined in the ERTM specification, including clearing the remote busy flag and setting the retransmit timer rather than retransmitting frames directly. The spec does not retransmit frames as part of this action, since retransmission is only triggered by REJ, SREJ, or an RR with the final bit set. struct l2cap_ctrl is also used to set up header values. Signed-off-by: Mat Martineau Signed-off-by: Gustavo Padovan --- net/bluetooth/l2cap_core.c | 40 ++++++++++++++++++-------------------- 1 file changed, 19 insertions(+), 21 deletions(-) diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index 8436806835e0..a7d96c937392 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -1760,18 +1760,6 @@ static int l2cap_ertm_send(struct l2cap_chan *chan) return sent; } -static int l2cap_retransmit_frames(struct l2cap_chan *chan) -{ - int ret; - - if (!skb_queue_empty(&chan->tx_q)) - chan->tx_send_head = chan->tx_q.next; - - chan->next_tx_seq = chan->expected_ack_seq; - ret = l2cap_ertm_send(chan); - return ret; -} - static void l2cap_send_ack(struct l2cap_chan *chan) { struct l2cap_ctrl control; @@ -4195,25 +4183,35 @@ static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) { - u32 control = 0; + struct l2cap_ctrl control; - chan->frames_sent = 0; + BT_DBG("chan %p", chan); - control |= __set_reqseq(chan, chan->buffer_seq); + memset(&control, 0, sizeof(control)); + control.sframe = 1; + control.final = 1; + control.reqseq = chan->buffer_seq; + set_bit(CONN_SEND_FBIT, &chan->conn_state); if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { - control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); - set_bit(CONN_RNR_SENT, &chan->conn_state); + control.super = L2CAP_SUPER_RNR; + l2cap_send_sframe(chan, &control); } - if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) - l2cap_retransmit_frames(chan); + if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && + chan->unacked_frames > 0) + __set_retrans_timer(chan); + /* Send pending iframes */ l2cap_ertm_send(chan); if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && - chan->frames_sent == 0) { - control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); + test_bit(CONN_SEND_FBIT, &chan->conn_state)) { + /* F-bit wasn't sent in an s-frame or i-frame yet, so + * send it now. + */ + control.super = L2CAP_SUPER_RR; + l2cap_send_sframe(chan, &control); } } -- 2.20.1