linux-stable.git/net/tipc/link.c, branch linux-3.3.y

tipc: rename struct link* to struct tipc_link*

2011-12-30T02:53:30+00:00

This converts the following:

	struct link		->	struct tipc_link
	struct link_req		->	struct tipc_link_req
	struct link_name	->	struct tipc_link_name

Signed-off-by: Paul Gortmaker

tipc: rename struct media to struct tipc_media

2011-12-30T02:53:29+00:00

Give it a meaningful prefix, as suggested by DaveM, so that it
is consistent with things like struct tipc_bearer, and so it isn't
confused with anything else.  This has no impact on the actual
runtime code behaviour.

Signed-off-by: Paul Gortmaker

tipc: Allow use of buf_seqno() helper routine by unicast links

2011-12-27T16:33:54+00:00

Migrates the buf_seqno() helper routine from broadcast link level to
unicast link level so that it can be used both types of TIPC links.
This is a cosmetic change only, and does not affect the operation of TIPC.

Signed-off-by: Allan Stephens 
Signed-off-by: Paul Gortmaker

tipc: Ignore broadcast acknowledgements that are out-of-range

2011-12-27T16:33:53+00:00

Adds checks to TIPC's broadcast link so that it ignores any
acknowledgement message containing a sequence number that does not
correspond to an unacknowledged message currently in the broadcast
link's transmit queue.

This change prevents the broadcast link from becoming stalled if a
newly booted node receives stale broadcast link acknowledgement
information from another node that has not yet fully synchronized
its end of the broadcast link to reflect the current state of the
new node's end.

Signed-off-by: Allan Stephens 
Signed-off-by: Paul Gortmaker

tipc: Allow run-time alteration of default link settings

2011-12-27T16:33:39+00:00

Permits run-time alteration of default link settings on a per-media
and per-bearer basis, in addition to the existing per-link basis.
The following syntax can now be used:

    tipc-config -lt=/
    tipc-config -lp=/
    tipc-config -lw=/

Note that changes to the default settings for a given media type has
no effect on the default settings used by existing bearers. Similarly,
changes to default bearer settings has no effect on existing link
endpoints that utilize that interface.

Thanks to Florian Westphal  for his contributions to
the development of this enhancement.

Signed-off-by: Allan Stephens 
Signed-off-by: Paul Gortmaker

tipc: Remove unused link event tracking code

2011-09-18T02:55:15+00:00

Elimintes prototype link event tracking functionality that has never
been fleshed out and doesn't do anything useful at the current time.

Signed-off-by: Ying Xue 
Signed-off-by: Allan Stephens 
Signed-off-by: Paul Gortmaker

tipc: Enhance sending of bulk name table messages

2011-09-18T02:55:10+00:00

Modifies the initial transfer of name table entries to a new neighboring
node so that the messages are enqueued as a unit, rather than individually.

The revised algorithm now locates the link carrying the message only once,
and eliminates unnecessary checks for link congestion, message fragmentation,
and message bundling that are not required when sending these messages.

Signed-off-by: Allan Stephens 
Signed-off-by: Paul Gortmaker

tipc: Ensure both nodes recognize loss of contact between them

2011-09-18T02:55:03+00:00

Enhances TIPC to ensure that a node that loses contact with a
neighboring node does not allow contact to be re-established until
it sees that its peer has also recognized the loss of contact.

Previously, nodes that were connected by two or more links could
encounter a situation in which node A would lose contact with node B
on all of its links, purge its name table of names published by B,
and then fail to repopulate those names once contact with B was restored.
This would happen because B was able to re-establish one or more links
so quickly that it never reached a point where it had no links to A --
meaning that B never saw a loss of contact with A, and consequently
didn't re-publish its names to A.

This problem is now prevented by enhancing the cleanup done by TIPC
following a loss of contact with a neighboring node to ensure that
node A ignores all messages sent by B until it receives a LINK_PROTOCOL
message that indicates B has lost contact with A, thereby preventing
the (re)establishment of links between the nodes. The loss of contact
is recognized when a RESET or ACTIVATE message is received that has
a "redundant link exists" field of 0, indicating that B's sending link
endpoint is in a reset state and that B has no other working links.

Additionally, TIPC now suppresses the sending of (most) link protocol
messages to a neighboring node while it is cleaning up after an earlier
loss of contact with that node. This stops the peer node from prematurely
activating its link endpoint, which would prevent TIPC from later
activating its own end. TIPC still allows outgoing RESET messages to
occur during cleanup, to avoid problems if its own node recognizes
the loss of contact first and tries to notify the peer of the situation.

Finally, TIPC now recognizes an impending loss of contact with a peer node
as soon as it receives a RESET message on a working link that is the
peer's only link to the node, and ensures that the link protocol
suppression mentioned above goes into effect right away -- that is,
even before its own link endpoints have failed. This is necessary to
ensure correct operation when there are redundant links between the nodes,
since otherwise TIPC would send an ACTIVATE message upon receiving a RESET
on its first link and only begin suppressing when a RESET on its second
link was received, instead of initiating suppression with the first RESET
message as it needs to.

Note: The reworked cleanup code also eliminates a check that prevented
a link endpoint's discovery object from responding to incoming messages
while stale name table entries are being purged. This check is now
unnecessary and would have slowed down re-establishment of communication
between the nodes in some situations.

Signed-off-by: Allan Stephens 
Signed-off-by: Paul Gortmaker

tipc: Eliminate redundant check when sending messages

2011-09-01T15:16:37+00:00

Eliminates code in tipc_send_buf_fast() that handles messages
sent to a destination on the current node, since the only caller
of the routine only passes in messages destined for other nodes.

Signed-off-by: Allan Stephens 
Signed-off-by: Paul Gortmaker

tipc: Enhance filtering of out-dated link reset messages

2011-09-01T15:16:35+00:00

Ensure TIPC ignores an out-dated link reset message whose session
number predates the current session number. (Previously, TIPC only
ignored an out-date reset message whose session number was equal
to the current link session number.)

Out-dated link reset messages should not occur under normal circumstances;
however, they can be generated if a link endpoint is unable to send a
link reset message right away and queues it for later delivery, but the
queued message is not sent until after the link is established.

Thanks to Laser [gotolaser@gmail.com] for diagnosing the problem and
contributing a prototype patch.

Signed-off-by: Allan Stephens 
Signed-off-by: Paul Gortmaker