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Bluetooth: L2CAP: Derive MPS from connection MTU

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This ensures the MPS can fit in a single HCI fragment so each
segment don't have to be reassembled at HCI level, in addition to
that also remove the debugfs entry to configure the MPS.

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 13:39:20 +03:00 committed by Marcel Holtmann
parent a357ea098c
commit fe1493101a
2 changed files with 7 additions and 8 deletions
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1
include/net/bluetooth/l2cap.h
View File

@ -456,7 +456,6 @@ struct l2cap_conn_param_update_rsp {
#define L2CAP_CONN_PARAM_REJECTED 0x0001
#define L2CAP_LE_MAX_CREDITS 10
#define L2CAP_LE_DEFAULT_MPS 230
struct l2cap_le_conn_req {
__le16 psm;

14
net/bluetooth/l2cap_core.c
View File

@ -52,7 +52,6 @@ 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);
@ -520,7 +519,8 @@ static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
chan->sdu_len = 0;
chan->tx_credits = 0;
chan->rx_credits = le_max_credits;
chan->mps = min_t(u16, chan->imtu, le_default_mps);
/* Derive MPS from connection MTU to stop HCI fragmentation */
chan->mps = min_t(u16, chan->imtu, chan->conn->mtu - L2CAP_HDR_SIZE);
skb_queue_head_init(&chan->tx_q);
}
@ -1282,6 +1282,8 @@ static void l2cap_le_connect(struct l2cap_chan *chan)
if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
return;
l2cap_le_flowctl_init(chan);
req.psm = chan->psm;
req.scid = cpu_to_le16(chan->scid);
req.mtu = cpu_to_le16(chan->imtu);
@ -5493,8 +5495,6 @@ static int l2cap_le_connect_req(struct l2cap_conn *conn,
goto response_unlock;
}
l2cap_le_flowctl_init(chan);
bacpy(&chan->src, &conn->hcon->src);
bacpy(&chan->dst, &conn->hcon->dst);
chan->src_type = bdaddr_src_type(conn->hcon);
@ -5506,6 +5506,9 @@ static int l2cap_le_connect_req(struct l2cap_conn *conn,
chan->tx_credits = __le16_to_cpu(req->credits);
__l2cap_chan_add(conn, chan);
l2cap_le_flowctl_init(chan);
dcid = chan->scid;
credits = chan->rx_credits;
@ -7102,7 +7105,6 @@ int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
case L2CAP_MODE_BASIC:
break;
case L2CAP_MODE_LE_FLOWCTL:
l2cap_le_flowctl_init(chan);
break;
case L2CAP_MODE_ERTM:
case L2CAP_MODE_STREAMING:
@ -7647,8 +7649,6 @@ int __init l2cap_init(void)
debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs,
&le_max_credits);
debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs,
&le_default_mps);
return 0;
}