Bluetooth: Add debugfs controls for LE CoC MPS and Credits
authorJohan Hedberg <johan.hedberg@intel.com>
Tue, 3 Dec 2013 13:08:25 +0000 (15:08 +0200)
committerMarcel Holtmann <marcel@holtmann.org>
Thu, 5 Dec 2013 15:05:36 +0000 (07:05 -0800)
This patch adds entries to debugfs to control the values used for the
MPS and Credits for LE Flow Control Mode.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
net/bluetooth/l2cap_core.c

index 5941c65728b232a4a16d3c3fee55575923f7ef5c..8e9e883874ce86b6042cfd063ed077d3ab0aad8c 100644 (file)
@@ -49,6 +49,9 @@ static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP | L2CAP_FC_CONNLESS, };
 static LIST_HEAD(chan_list);
 static DEFINE_RWLOCK(chan_list_lock);
 
+static u16 le_max_credits = L2CAP_LE_MAX_CREDITS;
+static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS;
+
 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
                                       u8 code, u8 ident, u16 dlen, void *data);
 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
@@ -501,7 +504,7 @@ void l2cap_le_flowctl_init(struct l2cap_chan *chan)
        chan->omtu = L2CAP_LE_MIN_MTU;
        chan->mode = L2CAP_MODE_LE_FLOWCTL;
        chan->tx_credits = 0;
-       chan->rx_credits = L2CAP_LE_MAX_CREDITS;
+       chan->rx_credits = le_max_credits;
 
        if (chan->imtu < L2CAP_LE_DEFAULT_MPS)
                chan->mps = chan->imtu;
@@ -1214,7 +1217,7 @@ static void l2cap_le_flowctl_start(struct l2cap_chan *chan)
        if (chan->imtu < L2CAP_LE_DEFAULT_MPS)
                chan->mps = chan->imtu;
        else
-               chan->mps = L2CAP_LE_DEFAULT_MPS;
+               chan->mps = le_default_mps;
 
        skb_queue_head_init(&chan->tx_q);
 
@@ -6831,10 +6834,10 @@ static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
        /* 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)
+       if (chan->rx_credits >= (le_max_credits + 1) / 2)
                return;
 
-       return_credits = L2CAP_LE_MAX_CREDITS - chan->rx_credits;
+       return_credits = le_max_credits - chan->rx_credits;
 
        BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
 
@@ -7448,6 +7451,11 @@ int __init l2cap_init(void)
        l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
                                            NULL, &l2cap_debugfs_fops);
 
+       debugfs_create_u16("l2cap_le_max_credits", 0466, bt_debugfs,
+                          &le_max_credits);
+       debugfs_create_u16("l2cap_le_default_mps", 0466, bt_debugfs,
+                          &le_default_mps);
+
        return 0;
 }