tipc: add functionality to lookup multicast destination nodes

As a further preparation for the upcoming 'replicast' functionality,
we add some necessary structs and functions for looking up and returning
a list of all nodes that host destinations for a given multicast message.

Reviewed-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
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, 31 insertions, 2 deletions

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index 325627612bac..412d3351abb7 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -39,9 +39,8 @@
 #include "socket.h"
 #include "msg.h"
 #include "bcast.h"
-#include "name_distr.h"
 #include "link.h"
-#include "node.h"
+#include "name_table.h"
 
 #define BCLINK_WIN_DEFAULT      50      /* bcast link window size (default) */
 #define BCLINK_WIN_MIN          32      /* bcast minimum link window size */
@@ -434,3 +433,33 @@ void tipc_bcast_stop(struct net *net)
         kfree(tn->bcbase);
         kfree(tn->bcl);
 }
+
+void tipc_nlist_init(struct tipc_nlist *nl, u32 self)
+{
+        memset(nl, 0, sizeof(*nl));
+        INIT_LIST_HEAD(&nl->list);
+        nl->self = self;
+}
+
+void tipc_nlist_add(struct tipc_nlist *nl, u32 node)
+{
+        if (node == nl->self)
+                nl->local = true;
+        else if (u32_push(&nl->list, node))
+                nl->remote++;
+}
+
+void tipc_nlist_del(struct tipc_nlist *nl, u32 node)
+{
+        if (node == nl->self)
+                nl->local = false;
+        else if (u32_del(&nl->list, node))
+                nl->remote--;
+}
+
+void tipc_nlist_purge(struct tipc_nlist *nl)
+{
+        u32_list_purge(&nl->list);
+        nl->remote = 0;
+        nl->local = 0;
+}