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| author | Jon Paul Maloy <jon.maloy@ericsson.com> | 2015-07-31 01:24:21 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-07-31 03:25:14 +0300 |
| commit | 662921cd0a53db4504838dfbb7d996f9e6e94001 (patch) | |
| tree | 22093f4240391972cd6bcf879cbdfe963a73bdb1 /net/tipc/link.h | |
| parent | 5045f7b9009f1455268b98cecbcc271663934c85 (diff) | |
| download | linux-662921cd0a53db4504838dfbb7d996f9e6e94001.tar.xz | |
tipc: merge link->exec_mode and link->state into one FSM
Until now, we have been handling link failover and synchronization
by using an additional link state variable, "exec_mode". This variable
is not independent of the link FSM state, something causing a risk of
inconsistencies, apart from the fact that it clutters the code.
The conditions are now in place to define a new link FSM that covers
all existing use cases, including failover and synchronization, and
eliminate the "exec_mode" field altogether. The FSM must also support
non-atomic resetting of links, which will be introduced later.
The new link FSM is shown below, with 7 states and 8 events.
Only events leading to state change are shown as edges.
+------------------------------------+
|RESET_EVT |
| |
| +--------------+
| +-----------------| SYNCHING |-----------------+
| |FAILURE_EVT +--------------+ PEER_RESET_EVT|
| | A | |
| | | | |
| | | | |
| | |SYNCH_ |SYNCH_ |
| | |BEGIN_EVT |END_EVT |
| | | | |
| V | V V
| +-------------+ +--------------+ +------------+
| | RESETTING |<---------| ESTABLISHED |--------->| PEER_RESET |
| +-------------+ FAILURE_ +--------------+ PEER_ +------------+
| | EVT | A RESET_EVT |
| | | | |
| | | | |
| | +--------------+ | |
| RESET_EVT| |RESET_EVT |ESTABLISH_EVT |
| | | | |
| | | | |
| V V | |
| +-------------+ +--------------+ RESET_EVT|
+--->| RESET |--------->| ESTABLISHING |<----------------+
+-------------+ PEER_ +--------------+
| A RESET_EVT |
| | |
| | |
|FAILOVER_ |FAILOVER_ |FAILOVER_
|BEGIN_EVT |END_EVT |BEGIN_EVT
| | |
V | |
+-------------+ |
| FAILINGOVER |<----------------+
+-------------+
These changes are fully backwards compatible.
Tested-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>
Diffstat (limited to 'net/tipc/link.h')
| -rw-r--r-- | net/tipc/link.h | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/net/tipc/link.h b/net/tipc/link.h index b317c4df9079..39b8c4c5121e 100644 --- a/net/tipc/link.h +++ b/net/tipc/link.h @@ -49,13 +49,17 @@ */ #define INVALID_LINK_SEQ 0x10000 - -/* Link endpoint receive states +/* Link FSM events: */ enum { - TIPC_LINK_OPEN, - TIPC_LINK_BLOCKED, - TIPC_LINK_TUNNEL + LINK_ESTABLISH_EVT = 0xec1ab1e, + LINK_PEER_RESET_EVT = 0x9eed0e, + LINK_FAILURE_EVT = 0xfa110e, + LINK_RESET_EVT = 0x10ca1d0e, + LINK_FAILOVER_BEGIN_EVT = 0xfa110bee, + LINK_FAILOVER_END_EVT = 0xfa110ede, + LINK_SYNCH_BEGIN_EVT = 0xc1ccbee, + LINK_SYNCH_END_EVT = 0xc1ccede }; /* Events returned from link at packet reception or at timeout @@ -120,7 +124,6 @@ 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 @@ -155,7 +158,7 @@ struct tipc_link { u32 tolerance; unsigned long keepalive_intv; u32 abort_limit; - int state; + u32 state; u32 silent_intv_cnt; struct { unchar hdr[INT_H_SIZE]; @@ -166,7 +169,6 @@ struct tipc_link { char net_plane; /* Failover/synch */ - u8 exec_mode; u16 drop_point; struct sk_buff *failover_reasm_skb; @@ -214,8 +216,13 @@ void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, int mtyp, struct sk_buff_head *xmitq); void tipc_link_build_bcast_sync_msg(struct tipc_link *l, struct sk_buff_head *xmitq); +int tipc_link_fsm_evt(struct tipc_link *l, int evt); void tipc_link_reset_fragments(struct tipc_link *l_ptr); -int tipc_link_is_up(struct tipc_link *l_ptr); +bool tipc_link_is_up(struct tipc_link *l); +bool tipc_link_is_reset(struct tipc_link *l); +bool tipc_link_is_synching(struct tipc_link *l); +bool tipc_link_is_failingover(struct tipc_link *l); +bool tipc_link_is_blocked(struct tipc_link *l); int tipc_link_is_active(struct tipc_link *l_ptr); void tipc_link_purge_queues(struct tipc_link *l_ptr); void tipc_link_purge_backlog(struct tipc_link *l); |