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Bluetooth: L2CAP: Detect if remote is not able to use the whole MPS 

If the remote is not able to fully utilize the MPS choosen recalculate
the credits based on the actual amount it is sending that way it can
still send packets of MTU size without credits dropping to 0.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Luiz Augusto von Dentz 2018-09-04 13:39:22 +03:00 committed by Marcel Holtmann
parent 96cd8eaa13
commit a5c3021bb6
1 changed files with 10 additions and 0 deletions
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10
net/bluetooth/l2cap_core.c
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@ -6787,6 +6787,16 @@ static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
chan->sdu_len = sdu_len;
chan->sdu_last_frag = skb;
/* Detect if remote is not able to use the selected MPS */
if (skb->len + L2CAP_SDULEN_SIZE < chan->mps) {
u16 mps_len = skb->len + L2CAP_SDULEN_SIZE;
/* Adjust the number of credits */
BT_DBG("chan->mps %u -> %u", chan->mps, mps_len);
chan->mps = mps_len;
l2cap_chan_le_send_credits(chan);
}
return 0;
}