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Bluetooth: L2CAP: Use DEFER_SETUP to group ECRED connections 

This uses the DEFER_SETUP flag to group channels with
L2CAP_CREDIT_BASED_CONNECTION_REQ.

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 2020-03-25 12:37:53 -07:00 committed by Marcel Holtmann
parent 32b50729d9
commit da49b602f7
2 changed files with 131 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/bluetooth/l2cap.h
View File

@ -47,6 +47,7 @@
#define L2CAP_DEFAULT_ACC_LAT 0xFFFFFFFF
#define L2CAP_BREDR_MAX_PAYLOAD 1019 /* 3-DH5 packet */
#define L2CAP_LE_MIN_MTU 23
#define L2CAP_ECRED_CONN_SCID_MAX 5
#define L2CAP_DISC_TIMEOUT msecs_to_jiffies(100)
#define L2CAP_DISC_REJ_TIMEOUT msecs_to_jiffies(5000)
@ -984,6 +985,9 @@ void l2cap_chan_set_defaults(struct l2cap_chan *chan);
int l2cap_ertm_init(struct l2cap_chan *chan);
void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
typedef void (*l2cap_chan_func_t)(struct l2cap_chan *chan, void *data);
void l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func,
void *data);
void l2cap_chan_del(struct l2cap_chan *chan, int err);
void l2cap_send_conn_req(struct l2cap_chan *chan);
void l2cap_move_start(struct l2cap_chan *chan);

137
net/bluetooth/l2cap_core.c
View File

@ -678,6 +678,29 @@ void l2cap_chan_del(struct l2cap_chan *chan, int err)
}
EXPORT_SYMBOL_GPL(l2cap_chan_del);
static void __l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func,
void *data)
{
struct l2cap_chan *chan;
list_for_each_entry(chan, &conn->chan_l, list) {
func(chan, data);
}
}
void l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func,
void *data)
{
if (!conn)
return;
mutex_lock(&conn->chan_lock);
__l2cap_chan_list(conn, func, data);
mutex_unlock(&conn->chan_lock);
}
EXPORT_SYMBOL_GPL(l2cap_chan_list);
static void l2cap_conn_update_id_addr(struct work_struct *work)
{
struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
@ -1356,29 +1379,79 @@ static void l2cap_le_connect(struct l2cap_chan *chan)
sizeof(req), &req);
}
static void l2cap_ecred_connect(struct l2cap_chan *chan)
{
struct l2cap_conn *conn = chan->conn;
struct l2cap_ecred_conn_data {
struct {
struct l2cap_ecred_conn_req req;
__le16 scid;
__le16 scid[5];
} __packed pdu;
struct l2cap_chan *chan;
struct pid *pid;
int count;
};
static void l2cap_ecred_defer_connect(struct l2cap_chan *chan, void *data)
{
struct l2cap_ecred_conn_data *conn = data;
struct pid *pid;
if (chan == conn->chan)
return;
if (!test_and_clear_bit(FLAG_DEFER_SETUP, &chan->flags))
return;
pid = chan->ops->get_peer_pid(chan);
/* Only add deferred channels with the same PID/PSM */
if (conn->pid != pid || chan->psm != conn->chan->psm || chan->ident ||
chan->mode != L2CAP_MODE_EXT_FLOWCTL || chan->state != BT_CONNECT)
return;
if (test_and_set_bit(FLAG_ECRED_CONN_REQ_SENT, &chan->flags))
return;
l2cap_ecred_init(chan, 0);
pdu.req.psm = chan->psm;
pdu.req.mtu = cpu_to_le16(chan->imtu);
pdu.req.mps = cpu_to_le16(chan->mps);
pdu.req.credits = cpu_to_le16(chan->rx_credits);
pdu.scid = cpu_to_le16(chan->scid);
/* Set the same ident so we can match on the rsp */
chan->ident = conn->chan->ident;
/* Include all channels deferred */
conn->pdu.scid[conn->count] = cpu_to_le16(chan->scid);
conn->count++;
}
static void l2cap_ecred_connect(struct l2cap_chan *chan)
{
struct l2cap_conn *conn = chan->conn;
struct l2cap_ecred_conn_data data;
if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
return;
if (test_and_set_bit(FLAG_ECRED_CONN_REQ_SENT, &chan->flags))
return;
l2cap_ecred_init(chan, 0);
data.pdu.req.psm = chan->psm;
data.pdu.req.mtu = cpu_to_le16(chan->imtu);
data.pdu.req.mps = cpu_to_le16(chan->mps);
data.pdu.req.credits = cpu_to_le16(chan->rx_credits);
data.pdu.scid[0] = cpu_to_le16(chan->scid);
chan->ident = l2cap_get_ident(conn);
data.pid = chan->ops->get_peer_pid(chan);
data.count = 1;
data.chan = chan;
data.pid = chan->ops->get_peer_pid(chan);
__l2cap_chan_list(conn, l2cap_ecred_defer_connect, &data);
l2cap_send_cmd(conn, chan->ident, L2CAP_ECRED_CONN_REQ,
sizeof(pdu), &pdu);
sizeof(data.pdu.req) + data.count * sizeof(__le16),
&data.pdu);
}
static void l2cap_le_start(struct l2cap_chan *chan)
@ -7693,6 +7766,33 @@ static bool is_valid_psm(u16 psm, u8 dst_type) {
return ((psm & 0x0101) == 0x0001);
}
struct l2cap_chan_data {
struct l2cap_chan *chan;
struct pid *pid;
int count;
};
static void l2cap_chan_by_pid(struct l2cap_chan *chan, void *data)
{
struct l2cap_chan_data *d = data;
struct pid *pid;
if (chan == d->chan)
return;
if (!test_bit(FLAG_DEFER_SETUP, &chan->flags))
return;
pid = chan->ops->get_peer_pid(chan);
/* Only count deferred channels with the same PID/PSM */
if (d->pid != pid || chan->psm != d->chan->psm || chan->ident ||
chan->mode != L2CAP_MODE_EXT_FLOWCTL || chan->state != BT_CONNECT)
return;
d->count++;
}
int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
bdaddr_t *dst, u8 dst_type)
{
@ -7812,6 +7912,23 @@ int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
goto done;
}
if (chan->mode == L2CAP_MODE_EXT_FLOWCTL) {
struct l2cap_chan_data data;
data.chan = chan;
data.pid = chan->ops->get_peer_pid(chan);
data.count = 1;
l2cap_chan_list(conn, l2cap_chan_by_pid, &data);
/* Check if there isn't too many channels being connected */
if (data.count > L2CAP_ECRED_CONN_SCID_MAX) {
hci_conn_drop(hcon);
err = -EPROTO;
goto done;
}
}
mutex_lock(&conn->chan_lock);
l2cap_chan_lock(chan);