vsw_create_tx_dring_info
extern vio_dring_reg_msg_t *vsw_create_tx_dring_info(vsw_ldc_t *);
msg = (void *) vsw_create_tx_dring_info(ldcp);
vio_dring_reg_msg_t *vsw_create_tx_dring_info(vsw_ldc_t *);