dn_find_flowset
fs = dn_find_flowset(pipe_nr);
fs = dn_find_flowset(ioc_fs->fs_nr);
fs = dn_find_flowset(ioc_pipe->fs.fs_nr);
fs = dn_find_flowset(pipe_nr);
fs = dn_find_flowset(ioc_fs->fs_nr);
fs = dn_find_flowset(ioc_pipe->fs.fs_nr);