tree 80dd3de19aea9eda8f91f2ec6b4ae0d3ff5a8d4a
parent 7c4a54b963b68eee5ef3bd7ca740630d965616e2
author Jon Paul Maloy <jon.maloy@ericsson.com> 1472752371 -0400
committer David S. Miller <davem@davemloft.net> 1472861425 -0700

tipc: send broadcast nack directly upon sequence gap detection

Because of the risk of an excessive number of NACK messages and
retransissions, receivers have until now abstained from sending
broadcast NACKS directly upon detection of a packet sequence number
gap. We have instead relied on such gaps being detected by link
protocol STATE message exchange, something that by necessity delays
such detection and subsequent retransmissions.

With the introduction of unicast NACK transmission and rate control
of retransmissions we can now remove this limitation. We now allow
receiving nodes to send NACKS immediately, while coordinating the
permission to do so among the nodes in order to avoid NACK storms.

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>