tipc_node_get_mtu
u32 msg_dsz = ((tipc_node_get_mtu(net, dnode, 0, false) - INT_H_SIZE) /
int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel, bool connected);
mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true);
tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);