From 13a2e89873506d64d7e52f17b571da371a3e25a4 Mon Sep 17 00:00:00 2001
From: Ying Xue <ying.xue@windriver.com>
Date: Mon, 17 Jun 2013 10:54:40 -0400
Subject: tipc: convert topology server to use new server facility

As the new TIPC server infrastructure has been introduced, we can
now convert the TIPC topology server to it.  We get two benefits
from doing this:

1) It simplifies the topology server locking policy.  In the
original locking policy, we placed one spin lock pointer in the
tipc_subscriber structure to reuse the lock of the subscriber's
server port, controlling access to members of tipc_subscriber
instance.  That is, we only used one lock to ensure both
tipc_port and tipc_subscriber members were safely accessed.

Now we introduce another spin lock for tipc_subscriber structure
only protecting themselves, to get a finer granularity locking
policy.  Moreover, the change will allow us to make the topology
server code more readable and maintainable.

2) It fixes a bug where sent subscription events may be lost when
the topology port is congested.  Using the new service, the
topology server now queues sent events into an outgoing buffer,
and then wakes up a sender process which has been blocked in
workqueue context.  The process will keep picking events from the
buffer and send them to their respective subscribers, using the
kernel socket interface, until the buffer is empty. Even if the
socket is congested during transmission there is no risk that
events may be dropped, since the sender process may block when
needed.

Some minor reordering of initialization is done, since we now
have a scenario where the topology server must be started after
socket initialization has taken place, as the former depends
on the latter.  And overall, we see a simplification of the
TIPC subscriber code in making this changeover.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/tipc/subscr.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'net/tipc/subscr.h')

diff --git a/net/tipc/subscr.h b/net/tipc/subscr.h
index 218d2e07f0cc..43e6d6332a02 100644
--- a/net/tipc/subscr.h
+++ b/net/tipc/subscr.h
@@ -2,7 +2,7 @@
  * net/tipc/subscr.h: Include file for TIPC network topology service
  *
  * Copyright (c) 2003-2006, Ericsson AB
- * Copyright (c) 2005-2007, Wind River Systems
+ * Copyright (c) 2005-2007, 2012-2013, Wind River Systems
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -37,10 +37,14 @@
 #ifndef _TIPC_SUBSCR_H
 #define _TIPC_SUBSCR_H
 
+#include "server.h"
+
 struct tipc_subscription;
+struct tipc_subscriber;
 
 /**
  * struct tipc_subscription - TIPC network topology subscription object
+ * @subscriber: pointer to its subscriber
  * @seq: name sequence associated with subscription
  * @timeout: duration of subscription (in ms)
  * @filter: event filtering to be done for subscription
@@ -52,13 +56,13 @@ struct tipc_subscription;
  * @evt: template for events generated by subscription
  */
 struct tipc_subscription {
+	struct tipc_subscriber *subscriber;
 	struct tipc_name_seq seq;
 	u32 timeout;
 	u32 filter;
 	struct timer_list timer;
 	struct list_head nameseq_list;
 	struct list_head subscription_list;
-	u32 server_ref;
 	int swap;
 	struct tipc_event evt;
 };
-- 
cgit v1.2.3


From ae8509c420122866344bde1241e31858d0aa2fbc Mon Sep 17 00:00:00 2001
From: Paul Gortmaker <paul.gortmaker@windriver.com>
Date: Mon, 17 Jun 2013 10:54:47 -0400
Subject: tipc: cosmetic realignment of function arguments

No runtime code changes here.  Just a realign of the function
arguments to start where the 1st one was, and fit as many args
as can be put in an 80 char line.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/tipc/bcast.c       |  3 +--
 net/tipc/bcast.h       |  3 ++-
 net/tipc/discover.c    |  7 +++----
 net/tipc/eth_media.c   |  2 +-
 net/tipc/link.c        | 18 +++++++-----------
 net/tipc/msg.c         |  4 ++--
 net/tipc/msg.h         |  4 ++--
 net/tipc/name_table.c  | 10 +++++-----
 net/tipc/name_table.h  | 11 ++++++-----
 net/tipc/node_subscr.c |  2 +-
 net/tipc/port.c        |  7 ++++---
 net/tipc/port.h        | 10 ++++++----
 net/tipc/socket.c      | 12 ++++++------
 net/tipc/subscr.c      | 14 ++++----------
 net/tipc/subscr.h      | 13 ++++---------
 15 files changed, 54 insertions(+), 66 deletions(-)

(limited to 'net/tipc/subscr.h')

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index e5f3da507823..716de1ac6cb5 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -578,8 +578,7 @@ u32 tipc_bclink_acks_missing(struct tipc_node *n_ptr)
  * Returns 0 (packet sent successfully) under all circumstances,
  * since the broadcast link's pseudo-bearer never blocks
  */
-static int tipc_bcbearer_send(struct sk_buff *buf,
-			      struct tipc_bearer *unused1,
+static int tipc_bcbearer_send(struct sk_buff *buf, struct tipc_bearer *unused1,
 			      struct tipc_media_addr *unused2)
 {
 	int bp_index;
diff --git a/net/tipc/bcast.h b/net/tipc/bcast.h
index a93306557e00..6ee587b469fd 100644
--- a/net/tipc/bcast.h
+++ b/net/tipc/bcast.h
@@ -75,7 +75,8 @@ void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node);
 /**
  * tipc_nmap_equal - test for equality of node maps
  */
-static inline int tipc_nmap_equal(struct tipc_node_map *nm_a, struct tipc_node_map *nm_b)
+static inline int tipc_nmap_equal(struct tipc_node_map *nm_a,
+				  struct tipc_node_map *nm_b)
 {
 	return !memcmp(nm_a, nm_b, sizeof(*nm_a));
 }
diff --git a/net/tipc/discover.c b/net/tipc/discover.c
index eedff58d0387..ecc758c6eacf 100644
--- a/net/tipc/discover.c
+++ b/net/tipc/discover.c
@@ -70,8 +70,7 @@ struct tipc_link_req {
  * @dest_domain: network domain of node(s) which should respond to message
  * @b_ptr: ptr to bearer issuing message
  */
-static struct sk_buff *tipc_disc_init_msg(u32 type,
-					  u32 dest_domain,
+static struct sk_buff *tipc_disc_init_msg(u32 type, u32 dest_domain,
 					  struct tipc_bearer *b_ptr)
 {
 	struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE);
@@ -346,8 +345,8 @@ exit:
  *
  * Returns 0 if successful, otherwise -errno.
  */
-int tipc_disc_create(struct tipc_bearer *b_ptr,
-		     struct tipc_media_addr *dest, u32 dest_domain)
+int tipc_disc_create(struct tipc_bearer *b_ptr, struct tipc_media_addr *dest,
+		     u32 dest_domain)
 {
 	struct tipc_link_req *req;
 
diff --git a/net/tipc/eth_media.c b/net/tipc/eth_media.c
index fc60bea63169..c1aa37fdca2f 100644
--- a/net/tipc/eth_media.c
+++ b/net/tipc/eth_media.c
@@ -62,7 +62,7 @@ static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
 static int eth_started;
 
 static int recv_notification(struct notifier_block *nb, unsigned long evt,
-			      void *dv);
+			     void *dv);
 /*
  * Network device notifier info
  */
diff --git a/net/tipc/link.c b/net/tipc/link.c
index d34429d03c16..b852c94a784e 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -771,8 +771,7 @@ static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
  * link_bundle_buf(): Append contents of a buffer to
  * the tail of an existing one.
  */
-static int link_bundle_buf(struct tipc_link *l_ptr,
-			   struct sk_buff *bundler,
+static int link_bundle_buf(struct tipc_link *l_ptr, struct sk_buff *bundler,
 			   struct sk_buff *buf)
 {
 	struct tipc_msg *bundler_msg = buf_msg(bundler);
@@ -1064,8 +1063,7 @@ static int link_send_buf_fast(struct tipc_link *l_ptr, struct sk_buff *buf,
  */
 int tipc_link_send_sections_fast(struct tipc_port *sender,
 				 struct iovec const *msg_sect,
-				 const u32 num_sect,
-				 unsigned int total_len,
+				 const u32 num_sect, unsigned int total_len,
 				 u32 destaddr)
 {
 	struct tipc_msg *hdr = &sender->phdr;
@@ -1155,8 +1153,7 @@ exit:
  */
 static int link_send_sections_long(struct tipc_port *sender,
 				   struct iovec const *msg_sect,
-				   u32 num_sect,
-				   unsigned int total_len,
+				   u32 num_sect, unsigned int total_len,
 				   u32 destaddr)
 {
 	struct tipc_link *l_ptr;
@@ -1408,7 +1405,7 @@ static void link_reset_all(unsigned long addr)
 }
 
 static void link_retransmit_failure(struct tipc_link *l_ptr,
-					struct sk_buff *buf)
+				    struct sk_buff *buf)
 {
 	struct tipc_msg *msg = buf_msg(buf);
 
@@ -1863,8 +1860,8 @@ static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,
  * Send protocol message to the other endpoint.
  */
 void tipc_link_send_proto_msg(struct tipc_link *l_ptr, u32 msg_typ,
-				int probe_msg, u32 gap, u32 tolerance,
-				u32 priority, u32 ack_mtu)
+			      int probe_msg, u32 gap, u32 tolerance,
+			      u32 priority, u32 ack_mtu)
 {
 	struct sk_buff *buf = NULL;
 	struct tipc_msg *msg = l_ptr->pmsg;
@@ -2107,8 +2104,7 @@ exit:
  * another bearer. Owner node is locked.
  */
 static void tipc_link_tunnel(struct tipc_link *l_ptr,
-			     struct tipc_msg *tunnel_hdr,
-			     struct tipc_msg  *msg,
+			     struct tipc_msg *tunnel_hdr, struct tipc_msg *msg,
 			     u32 selector)
 {
 	struct tipc_link *tunnel;
diff --git a/net/tipc/msg.c b/net/tipc/msg.c
index c2a261322515..ced60e2fc4f7 100644
--- a/net/tipc/msg.c
+++ b/net/tipc/msg.c
@@ -51,8 +51,8 @@ u32 tipc_msg_tot_importance(struct tipc_msg *m)
 }
 
 
-void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
-			    u32 hsize, u32 destnode)
+void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type, u32 hsize,
+		   u32 destnode)
 {
 	memset(m, 0, hsize);
 	msg_set_version(m);
diff --git a/net/tipc/msg.h b/net/tipc/msg.h
index 511019a77c9c..5e4ccf5c27df 100644
--- a/net/tipc/msg.h
+++ b/net/tipc/msg.h
@@ -719,8 +719,8 @@ static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 }
 
 u32 tipc_msg_tot_importance(struct tipc_msg *m);
-void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
-			    u32 hsize, u32 destnode);
+void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type, u32 hsize,
+		   u32 destnode);
 int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect,
 		   u32 num_sect, unsigned int total_len, int max_size,
 		   struct sk_buff **buf);
diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
index 24b167914311..09dcd54b04e1 100644
--- a/net/tipc/name_table.c
+++ b/net/tipc/name_table.c
@@ -440,7 +440,7 @@ found:
  * sequence overlapping with the requested sequence
  */
 static void tipc_nameseq_subscribe(struct name_seq *nseq,
-					struct tipc_subscription *s)
+				   struct tipc_subscription *s)
 {
 	struct sub_seq *sseq = nseq->sseqs;
 
@@ -662,7 +662,7 @@ exit:
  * tipc_nametbl_publish - add name publication to network name tables
  */
 struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
-				    u32 scope, u32 port_ref, u32 key)
+					 u32 scope, u32 port_ref, u32 key)
 {
 	struct publication *publ;
 
@@ -753,7 +753,7 @@ void tipc_nametbl_unsubscribe(struct tipc_subscription *s)
  * subseq_list - print specified sub-sequence contents into the given buffer
  */
 static int subseq_list(struct sub_seq *sseq, char *buf, int len, u32 depth,
-			u32 index)
+		       u32 index)
 {
 	char portIdStr[27];
 	const char *scope_str[] = {"", " zone", " cluster", " node"};
@@ -792,7 +792,7 @@ static int subseq_list(struct sub_seq *sseq, char *buf, int len, u32 depth,
  * nameseq_list - print specified name sequence contents into the given buffer
  */
 static int nameseq_list(struct name_seq *seq, char *buf, int len, u32 depth,
-			 u32 type, u32 lowbound, u32 upbound, u32 index)
+			u32 type, u32 lowbound, u32 upbound, u32 index)
 {
 	struct sub_seq *sseq;
 	char typearea[11];
@@ -849,7 +849,7 @@ static int nametbl_header(char *buf, int len, u32 depth)
  * nametbl_list - print specified name table contents into the given buffer
  */
 static int nametbl_list(char *buf, int len, u32 depth_info,
-			 u32 type, u32 lowbound, u32 upbound)
+			u32 type, u32 lowbound, u32 upbound)
 {
 	struct hlist_head *seq_head;
 	struct name_seq *seq;
diff --git a/net/tipc/name_table.h b/net/tipc/name_table.h
index 71cb4dc712df..f02f48b9a216 100644
--- a/net/tipc/name_table.h
+++ b/net/tipc/name_table.h
@@ -87,14 +87,15 @@ extern rwlock_t tipc_nametbl_lock;
 struct sk_buff *tipc_nametbl_get(const void *req_tlv_area, int req_tlv_space);
 u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *node);
 int tipc_nametbl_mc_translate(u32 type, u32 lower, u32 upper, u32 limit,
-			 struct tipc_port_list *dports);
+			      struct tipc_port_list *dports);
 struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
-				    u32 scope, u32 port_ref, u32 key);
+					 u32 scope, u32 port_ref, u32 key);
 int tipc_nametbl_withdraw(u32 type, u32 lower, u32 ref, u32 key);
 struct publication *tipc_nametbl_insert_publ(u32 type, u32 lower, u32 upper,
-					u32 scope, u32 node, u32 ref, u32 key);
-struct publication *tipc_nametbl_remove_publ(u32 type, u32 lower,
-					u32 node, u32 ref, u32 key);
+					     u32 scope, u32 node, u32 ref,
+					     u32 key);
+struct publication *tipc_nametbl_remove_publ(u32 type, u32 lower, u32 node,
+					     u32 ref, u32 key);
 void tipc_nametbl_subscribe(struct tipc_subscription *s);
 void tipc_nametbl_unsubscribe(struct tipc_subscription *s);
 int tipc_nametbl_init(void);
diff --git a/net/tipc/node_subscr.c b/net/tipc/node_subscr.c
index 5e34b015da45..8a7384c04add 100644
--- a/net/tipc/node_subscr.c
+++ b/net/tipc/node_subscr.c
@@ -42,7 +42,7 @@
  * tipc_nodesub_subscribe - create "node down" subscription for specified node
  */
 void tipc_nodesub_subscribe(struct tipc_node_subscr *node_sub, u32 addr,
-		       void *usr_handle, net_ev_handler handle_down)
+			    void *usr_handle, net_ev_handler handle_down)
 {
 	if (in_own_node(addr)) {
 		node_sub->node = NULL;
diff --git a/net/tipc/port.c b/net/tipc/port.c
index 0bb185a3ed4a..b3ed2fcab4fb 100644
--- a/net/tipc/port.c
+++ b/net/tipc/port.c
@@ -207,9 +207,10 @@ exit:
  * Returns pointer to (locked) TIPC port, or NULL if unable to create it
  */
 struct tipc_port *tipc_createport(struct sock *sk,
-			u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
-			void (*wakeup)(struct tipc_port *),
-			const u32 importance)
+				  u32 (*dispatcher)(struct tipc_port *,
+				  struct sk_buff *),
+				  void (*wakeup)(struct tipc_port *),
+				  const u32 importance)
 {
 	struct tipc_port *p_ptr;
 	struct tipc_msg *msg;
diff --git a/net/tipc/port.h b/net/tipc/port.h
index 241f529db942..5a7026b9c345 100644
--- a/net/tipc/port.h
+++ b/net/tipc/port.h
@@ -107,8 +107,10 @@ struct tipc_port_list;
  * TIPC port manipulation routines
  */
 struct tipc_port *tipc_createport(struct sock *sk,
-		u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
-		void (*wakeup)(struct tipc_port *), const u32 importance);
+				  u32 (*dispatcher)(struct tipc_port *,
+				  struct sk_buff *),
+				  void (*wakeup)(struct tipc_port *),
+				  const u32 importance);
 
 int tipc_reject_msg(struct sk_buff *buf, u32 err);
 
@@ -126,9 +128,9 @@ int tipc_portunreturnable(u32 portref, unsigned int *isunreturnable);
 int tipc_set_portunreturnable(u32 portref, unsigned int isunreturnable);
 
 int tipc_publish(u32 portref, unsigned int scope,
-		struct tipc_name_seq const *name_seq);
+		 struct tipc_name_seq const *name_seq);
 int tipc_withdraw(u32 portref, unsigned int scope,
-		struct tipc_name_seq const *name_seq);
+		  struct tipc_name_seq const *name_seq);
 
 int tipc_connect(u32 portref, struct tipc_portid const *port);
 
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 14ed54e961b6..ce8249c76827 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -278,7 +278,7 @@ void tipc_sock_release_local(struct socket *sock)
  */
 
 int tipc_sock_accept_local(struct socket *sock, struct socket **newsock,
-			    int flags)
+			   int flags)
 {
 	struct sock *sk = sock->sk;
 	int ret;
@@ -889,7 +889,7 @@ static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
  * Returns 0 if successful, otherwise errno
  */
 static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
-				struct tipc_port *tport)
+			 struct tipc_port *tport)
 {
 	u32 anc_data[3];
 	u32 err;
@@ -1736,8 +1736,8 @@ restart:
  *
  * Returns 0 on success, errno otherwise
  */
-static int setsockopt(struct socket *sock,
-		      int lvl, int opt, char __user *ov, unsigned int ol)
+static int setsockopt(struct socket *sock, int lvl, int opt, char __user *ov,
+		      unsigned int ol)
 {
 	struct sock *sk = sock->sk;
 	struct tipc_port *tport = tipc_sk_port(sk);
@@ -1795,8 +1795,8 @@ static int setsockopt(struct socket *sock,
  *
  * Returns 0 on success, errno otherwise
  */
-static int getsockopt(struct socket *sock,
-		      int lvl, int opt, char __user *ov, int __user *ol)
+static int getsockopt(struct socket *sock, int lvl, int opt, char __user *ov,
+		      int __user *ol)
 {
 	struct sock *sk = sock->sk;
 	struct tipc_port *tport = tipc_sk_port(sk);
diff --git a/net/tipc/subscr.c b/net/tipc/subscr.c
index f6be92a6973a..d38bb45d82e9 100644
--- a/net/tipc/subscr.c
+++ b/net/tipc/subscr.c
@@ -117,10 +117,8 @@ static void subscr_send_event(struct tipc_subscription *sub, u32 found_lower,
  *
  * Returns 1 if there is overlap, otherwise 0.
  */
-int tipc_subscr_overlap(struct tipc_subscription *sub,
-			u32 found_lower,
+int tipc_subscr_overlap(struct tipc_subscription *sub, u32 found_lower,
 			u32 found_upper)
-
 {
 	if (found_lower < sub->seq.lower)
 		found_lower = sub->seq.lower;
@@ -136,13 +134,9 @@ int tipc_subscr_overlap(struct tipc_subscription *sub,
  *
  * Protected by nameseq.lock in name_table.c
  */
-void tipc_subscr_report_overlap(struct tipc_subscription *sub,
-				u32 found_lower,
-				u32 found_upper,
-				u32 event,
-				u32 port_ref,
-				u32 node,
-				int must)
+void tipc_subscr_report_overlap(struct tipc_subscription *sub, u32 found_lower,
+				u32 found_upper, u32 event, u32 port_ref,
+				u32 node, int must)
 {
 	if (!tipc_subscr_overlap(sub, found_lower, found_upper))
 		return;
diff --git a/net/tipc/subscr.h b/net/tipc/subscr.h
index 43e6d6332a02..393e417bee3f 100644
--- a/net/tipc/subscr.h
+++ b/net/tipc/subscr.h
@@ -67,17 +67,12 @@ struct tipc_subscription {
 	struct tipc_event evt;
 };
 
-int tipc_subscr_overlap(struct tipc_subscription *sub,
-			u32 found_lower,
+int tipc_subscr_overlap(struct tipc_subscription *sub, u32 found_lower,
 			u32 found_upper);
 
-void tipc_subscr_report_overlap(struct tipc_subscription *sub,
-				u32 found_lower,
-				u32 found_upper,
-				u32 event,
-				u32 port_ref,
-				u32 node,
-				int must_report);
+void tipc_subscr_report_overlap(struct tipc_subscription *sub, u32 found_lower,
+				u32 found_upper, u32 event, u32 port_ref,
+				u32 node, int must);
 
 int tipc_subscr_start(void);
 
-- 
cgit v1.2.3