tipc: clean up definitions and usage of link flags

The status flag LINK_STOPPED is not needed any more, since the
mechanism for delayed deletion of links has been removed.
Likewise, LINK_STARTED and LINK_START_EVT are unnecessary,
because we can just as well start the link timer directly from
inside tipc_link_create().

We eliminate these flags in this commit.

Instead of the above flags, we now introduce three new link modes,
TIPC_LINK_OPEN, TIPC_LINK_BLOCKED and TIPC_LINK_TUNNEL. The values
indicate whether, and in the case of TIPC_LINK_TUNNEL, which, messages
the link is allowed to receive in this state. TIPC_LINK_BLOCKED also
blocks timer-driven protocol messages to be sent out, and any change
to the link FSM. Since the modes are mutually exclusive, we convert
them to state values, and rename the 'flags' field in struct tipc_link
to 'exec_mode'.

Finally, we move the #defines for link FSM states and events from link.h
into enums inside the file link.c, which is the real usage scope of
these definitions.

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

1 files changed, 8 insertions, 36 deletions

diff --git a/net/tipc/link.h b/net/tipc/link.h
index 7add2b90361d..0509c6de03cd 100644
--- a/net/tipc/link.h
+++ b/net/tipc/link.h
@@ -49,19 +49,14 @@
  */
 #define INVALID_LINK_SEQ 0x10000
 
-/* Link working states
- */
-#define WORKING_WORKING 560810u
-#define WORKING_UNKNOWN 560811u
-#define RESET_UNKNOWN   560812u
-#define RESET_RESET     560813u
 
-/* Link endpoint execution states
+/* Link endpoint receive states
  */
-#define LINK_STARTED     0x0001
-#define LINK_STOPPED     0x0002
-#define LINK_SYNCHING    0x0004
-#define LINK_FAILINGOVER 0x0008
+enum {
+        TIPC_LINK_OPEN,
+        TIPC_LINK_BLOCKED,
+        TIPC_LINK_TUNNEL
+};
 
 /* Starting value for maximum packet size negotiation on unicast links
  * (unless bearer MTU is less)
@@ -106,7 +101,6 @@ struct tipc_stats {
  * @timer: link timer
  * @owner: pointer to peer node
  * @refcnt: reference counter for permanent references (owner node & timer)
- * @flags: execution state flags for link endpoint instance
  * @peer_session: link session # being used by peer end of link
  * @peer_bearer_id: bearer id used by link's peer endpoint
  * @bearer_id: local bearer id used by link
@@ -119,6 +113,7 @@ struct tipc_stats {
  * @pmsg: convenience pointer to "proto_msg" field
  * @priority: current link priority
  * @net_plane: current link network plane ('A' through 'H')
+ * @exec_mode: transmit/receive mode for link endpoint instance
  * @backlog_limit: backlog queue congestion thresholds (indexed by importance)
  * @exp_msg_count: # of tunnelled messages expected during link changeover
  * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset
@@ -149,7 +144,6 @@ struct tipc_link {
         struct kref ref;
 
         /* Management and link supervision data */
-        unsigned int flags;
         u32 peer_session;
         u32 peer_bearer_id;
         u32 bearer_id;
@@ -165,6 +159,7 @@ struct tipc_link {
         struct tipc_msg *pmsg;
         u32 priority;
         char net_plane;
+        u8 exec_mode;
         u16 synch_point;
 
         /* Failover */
@@ -249,27 +244,4 @@ static inline u32 link_own_addr(struct tipc_link *l)
         return msg_prevnode(l->pmsg);
 }
 
-/*
- * Link status checking routines
- */
-static inline int link_working_working(struct tipc_link *l_ptr)
-{
-        return l_ptr->state == WORKING_WORKING;
-}
-
-static inline int link_working_unknown(struct tipc_link *l_ptr)
-{
-        return l_ptr->state == WORKING_UNKNOWN;
-}
-
-static inline int link_reset_unknown(struct tipc_link *l_ptr)
-{
-        return l_ptr->state == RESET_UNKNOWN;
-}
-
-static inline int link_reset_reset(struct tipc_link *l_ptr)
-{
-        return l_ptr->state == RESET_RESET;
-}
-
 #endif