Bluetooth: Add alloc_skb chan operator

Add channel-specific skb allocation method

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

include/net/bluetooth/l2cap.h

@@ -506,6 +506,9 @@ struct l2cap_ops {
 	int			(*recv) (void *data, struct sk_buff *skb);
 	void			(*close) (void *data);
 	void			(*state_change) (void *data, int state);
+	struct sk_buff		*(*alloc_skb) (struct l2cap_chan *chan,
+					unsigned long len, int nb, int *err);
+
 };
 
 struct l2cap_conn {

net/bluetooth/l2cap_core.c

@@ -1520,7 +1520,6 @@ static void l2cap_send_srejtail(struct l2cap_chan *chan)
 
 static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, struct msghdr *msg, int len, int count, struct sk_buff *skb)
 {
-	struct sock *sk = chan->sk;
 	struct l2cap_conn *conn = chan->conn;
 	struct sk_buff **frag;
 	int err, sent = 0;
@@ -1536,7 +1535,9 @@ static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, struct msghdr
 	while (len) {
 		count = min_t(unsigned int, conn->mtu, len);
 
-		*frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
+		*frag = chan->ops->alloc_skb(chan, count,
+					msg->msg_flags & MSG_DONTWAIT, &err);
+
 		if (!*frag)
 			return err;
 		if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
@@ -1566,8 +1567,10 @@ static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
 	BT_DBG("sk %p len %d priority %u", sk, (int)len, priority);
 
 	count = min_t(unsigned int, (conn->mtu - hlen), len);
-	skb = bt_skb_send_alloc(sk, count + hlen,
-			msg->msg_flags & MSG_DONTWAIT, &err);
+
+	skb = chan->ops->alloc_skb(chan, count + hlen,
+					msg->msg_flags & MSG_DONTWAIT, &err);
+
 	if (!skb)
 		return ERR_PTR(err);
 
@@ -1600,8 +1603,10 @@ static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
 	BT_DBG("sk %p len %d", sk, (int)len);
 
 	count = min_t(unsigned int, (conn->mtu - hlen), len);
-	skb = bt_skb_send_alloc(sk, count + hlen,
-			msg->msg_flags & MSG_DONTWAIT, &err);
+
+	skb = chan->ops->alloc_skb(chan, count + hlen,
+					msg->msg_flags & MSG_DONTWAIT, &err);
+
 	if (!skb)
 		return ERR_PTR(err);
 
@@ -1647,8 +1652,10 @@ static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
 		hlen += L2CAP_FCS_SIZE;
 
 	count = min_t(unsigned int, (conn->mtu - hlen), len);
-	skb = bt_skb_send_alloc(sk, count + hlen,
-			msg->msg_flags & MSG_DONTWAIT, &err);
+
+	skb = chan->ops->alloc_skb(chan, count + hlen,
+					msg->msg_flags & MSG_DONTWAIT, &err);
+
 	if (!skb)
 		return ERR_PTR(err);
 

net/bluetooth/l2cap_sock.c

@@ -899,12 +899,21 @@ static void l2cap_sock_state_change_cb(void *data, int state)
 	sk->sk_state = state;
 }
 
+static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
+					unsigned long len, int nb, int *err)
+{
+	struct sock *sk = chan->sk;
+
+	return bt_skb_send_alloc(sk, len, nb, err);
+}
+
 static struct l2cap_ops l2cap_chan_ops = {
 	.name		= "L2CAP Socket Interface",
 	.new_connection	= l2cap_sock_new_connection_cb,
 	.recv		= l2cap_sock_recv_cb,
 	.close		= l2cap_sock_close_cb,
 	.state_change	= l2cap_sock_state_change_cb,
+	.alloc_skb	= l2cap_sock_alloc_skb_cb,
 };
 
 static void l2cap_sock_destruct(struct sock *sk)