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tipc: Fix port counter handling to correct congestion control

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Modifies TIPC's congestion control between a connected port and its
peer so that it works as documented. The following changes have been
made:

1) The counter of the number of messages sent by a port now starts
   at zero, rather than one. This prevents the port from reporting port
   congestion one message earlier than it was supposed to.

2) The counter of the number of messages sent by a port is now
   incremented only if a non-empty message is sent successfully.
   This prevents the port from becoming permanently congested if
   too many send attempts are unsuccessful because of congestion
   (or other reasons). It also removes the risk that empty hand-
   shaking messages used during connection setup might cause the
   port to report congestion earlier than it was supposed to.

3) The counter of the number of unacknowledged messages received by
   a port controlled by an internal TIPC service is now incremented
   only if the message is non-empty, in order to be consistent with
   the aforementioned changes.

Signed-off-by: Allan Stephens <Allan.Stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
This commit is contained in:
Allan Stephens
2011-01-24 15:02:14 -05:00
committed by Paul Gortmaker
parent 69218fc426
commit cb7ce91448
2 changed files with 36 additions and 21 deletions
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net/tipc/port.h
+2 -2
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@@ -113,8 +113,8 @@ struct user_port {
* @user_port: ptr to user port associated with port (if any)
* @wait_list: adjacent ports in list of ports waiting on link congestion
* @waiting_pkts:
* @sent:
* @acked:
* @sent: # of non-empty messages sent by port
* @acked: # of non-empty message acknowledgements from connected port's peer
* @publications: list of publications for port
* @pub_count: total # of publications port has made during its lifetime
* @probing_state: