tipc: use pseudo message to wake up sockets after link congestion

The current link implementation keeps a linked list of blocked ports/
sockets that is populated when there is link congestion. The purpose
of this is to let the link know which users to wake up when the
congestion abates.

This adds unnecessary complexity to the data structure and the code,
since it forces us to involve the link each time we want to delete
a socket. It also forces us to grab the spinlock port_lock within
the scope of node_lock. We want to get rid of this direct dependence,
as well as the deadlock hazard resulting from the usage of port_lock.

In this commit, we instead let the link keep list of a "wakeup" pseudo
messages for use in such situations. Those messages are sent to the
pending sockets via the ordinary message reception path, and wake up
the socket's owner when they are received.

This enables us to get rid of the 'waiting_ports' linked lists in struct
tipc_port that manifest this direct reference. As a consequence, we can
eliminate another BH entry into the socket, and hence the need to grab
port_lock. This is a further step in our effort to remove port_lock
altogether.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 6 deletions

diff --git a/net/tipc/socket.h b/net/tipc/socket.h
index 43b75b3ceced..1405633362f5 100644
--- a/net/tipc/socket.h
+++ b/net/tipc/socket.h
@@ -58,7 +58,7 @@ struct tipc_sock {
 	struct tipc_port port;
 	unsigned int conn_timeout;
 	atomic_t dupl_rcvcnt;
-	int link_cong;
+	bool link_cong;
 	uint sent_unacked;
 	uint rcv_unacked;
 };
@@ -73,11 +73,6 @@ static inline struct tipc_sock *tipc_port_to_sock(const struct tipc_port *port)
 	return container_of(port, struct tipc_sock, port);
 }
 
-static inline void tipc_sock_wakeup(struct tipc_sock *tsk)
-{
-	tsk->sk.sk_write_space(&tsk->sk);
-}
-
 static inline int tipc_sk_conn_cong(struct tipc_sock *tsk)
 {
 	return tsk->sent_unacked >= TIPC_FLOWCTRL_WIN;