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When a socket is joining a group, we look up in the binding table to
find if there are already other members of the group present. This is
used for being able to return EAGAIN instead of EHOSTUNREACH if the
user proceeds directly to a send attempt.
However, the information in the binding table can be used to directly
set the created member in state MBR_PUBLISHED and send a JOIN message
to the peer, instead of waiting for a topology PUBLISH event to do this.
When there are many members in a group, the propagation time for such
events can be significant, and we can save time during the join
operation if we use the initial lookup result fully.
In this commit, we eliminate the member state MBR_DISCOVERED which has
been the result of the initial lookup, and do instead go directly to
MBR_PUBLISHED, which initiates the setup.
After this change, the tipc_member FSM looks as follows:
+-----------+
---->| PUBLISHED |-----------------------------------------------+
PUB- +-----------+ LEAVE/WITHRAW |
LISH |JOIN |
| +-------------------------------------------+ |
| | LEAVE/WITHDRAW | |
| | +------------+ | |
| | +----------->| PENDING |---------+ | |
| | |msg/maxactv +-+---+------+ LEAVE/ | | |
| | | | | WITHDRAW | | |
| | | +----------+ | | | |
| | | |revert/maxactv| | | |
| | | V V V V V
| +----------+ msg +------------+ +-----------+
+-->| JOINED |------>| ACTIVE |------>| LEAVING |--->
| +----------+ +--- -+------+ LEAVE/+-----------+DOWN
| A A | WITHDRAW A A A EVT
| | | |RECLAIM | | |
| | |REMIT V | | |
| | |== adv +------------+ | | |
| | +---------| RECLAIMING |--------+ | |
| | +-----+------+ LEAVE/ | |
| | |REMIT WITHDRAW | |
| | |< adv | |
| |msg/ V LEAVE/ | |
| |adv==ADV_IDLE+------------+ WITHDRAW | |
| +-------------| REMITTED |------------+ |
| +------------+ |
|PUBLISH |
JOIN +-----------+ LEAVE/WITHDRAW |
---->| JOINING |-----------------------------------------------+
+-----------+
Acked-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>
d12d2e12ce