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tipc: introduce capability bit for broadcast synchronization

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Until now, we have tried to support both the newer, dedicated broadcast
synchronization mechanism along with the older, less safe, RESET_MSG/
ACTIVATE_MSG based one. The latter method has turned out to be a hazard
in a highly dynamic cluster, so we find it safer to disable it completely
when we find that the former mechanism is supported by the peer node.

For this purpose, we now introduce a new capabability bit,
TIPC_BCAST_SYNCH, to inform any peer nodes that dedicated broadcast
syncronization is supported by the present node. The new bit is conveyed
between peers in the 'capabilities' field of neighbor discovery messages.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Paul Maloy 2015-10-22 08:51:40 -04:00 • committed by David S. Miller
parent 2f56612457
commit fd556f209a
6 changed files with 23 additions and 7 deletions
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6
net/tipc/node.c
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@ -584,8 +584,10 @@ void tipc_node_check_dest(struct net *net, u32 onode,
if (!tipc_link_create(n, if_name, b->identity, b->tolerance,
b->net_plane, b->mtu, b->priority,
b->window, mod(tipc_net(net)->random),
tipc_own_addr(net), onode, &le->maddr,
&le->inputq, &n->bclink.namedq, &l)) {
tipc_own_addr(net), onode,
n->capabilities,
&le->maddr, &le->inputq,
&n->bclink.namedq, &l)) {
*respond = false;
goto exit;
}