tipc: apply bearer link tolerance on running links

Currently, the default link tolerance set in struct tipc_bearer only
has effect on links going up after that moment. I.e., a user has to
reset all the node's links across that bearer to have the new value
applied. This is too limiting and disturbing on a running cluster to
be useful.

We now change this so that also already existing links are updated
dynamically, without any need for a reset, when the bearer value is
changed. We leverage the already existing per-link functionality
for this to achieve the wanted effect.

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>

1 files changed, 24 insertions, 0 deletions

diff --git a/net/tipc/node.c b/net/tipc/node.c
index 9036d8756e73..389193d7cf67 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -1618,6 +1618,30 @@ discard:
         kfree_skb(skb);
 }
 
+void tipc_node_apply_tolerance(struct net *net, struct tipc_bearer *b)
+{
+        struct tipc_net *tn = tipc_net(net);
+        int bearer_id = b->identity;
+        struct sk_buff_head xmitq;
+        struct tipc_link_entry *e;
+        struct tipc_node *n;
+
+        __skb_queue_head_init(&xmitq);
+
+        rcu_read_lock();
+
+        list_for_each_entry_rcu(n, &tn->node_list, list) {
+                tipc_node_write_lock(n);
+                e = &n->links[bearer_id];
+                if (e->link)
+                        tipc_link_set_tolerance(e->link, b->tolerance, &xmitq);
+                tipc_node_write_unlock(n);
+                tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr);
+        }
+
+        rcu_read_unlock();
+}
+
 int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
 {
         struct net *net = sock_net(skb->sk);