[RFC] Bluetooth: Add alloc_skb chan operator

[Emeltchenko Andrei <Andrei.Emeltchenko.news@gmail.com>]

From: Andrei Emeltchenko <andrei.emeltchenko@intel.com>

Add channel-specific skb allocation method

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
---
 include/net/bluetooth/l2cap.h |    3 +++
 net/bluetooth/l2cap_core.c    |   22 +++++++++++++++-------
 net/bluetooth/l2cap_sock.c    |    9 +++++++++
 3 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 34a882b..ed390ad 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/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 {
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 598805b..f9bd130 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -1531,7 +1531,9 @@ 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))
@@ -1561,8 +1563,10 @@ 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);
 
@@ -1595,8 +1599,10 @@ 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);
 
@@ -1642,8 +1648,10 @@ 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);
 
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index c57027f..4640c12 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -897,12 +897,21 @@ 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)
-- 
1.7.4.1