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authorLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2018-09-04 13:39:22 +0300
committerMarcel Holtmann <marcel@holtmann.org>2018-09-27 12:52:08 +0200
commita5c3021bb62b970713550db3f7fd08aa70665d7e (patch)
tree812fde45f8a4a5892a1982f80474eafe5a56a2a4 /net/bluetooth
parent96cd8eaa131f0ffd4cfae09e1b4bdfafb9570907 (diff)
downloadlinux-a5c3021bb62b970713550db3f7fd08aa70665d7e.tar.bz2
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>
Diffstat (limited to 'net/bluetooth')
-rw-r--r--net/bluetooth/l2cap_core.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 3fb2d757df88..514899f7f0d4 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -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;
}