/* netmap_pipe_krings_delete.
*
* There are two cases:
*
* 1) state is
*
* usr1 --> e1 --> e2
*
* and we are e1. We have to create both sets
* of krings.
*
* 2) state is
*
* usr1 --> e1 --> e2
*
* and we are e2. e1 is certainly registered and our
* krings already exist. Nothing to do.
*/
static int
netmap_pipe_krings_create(struct netmap_adapter *na)
{
struct netmap_pipe_adapter *pna =
(struct netmap_pipe_adapter *)na;
struct netmap_adapter *ona = &pna->peer->up;
int error = 0;
enum txrx t;
if (pna->peer_ref) {
int i;
/* case 1) above */
D("%p: case 1, create both ends", na);
error = netmap_krings_create(na, 0);
if (error)
goto err;
/* create the krings of the other end */
error = netmap_krings_create(ona, 0);
if (error)
goto del_krings1;
/* cross link the krings */
for_rx_tx(t) {
enum txrx r = nm_txrx_swap(t); /* swap NR_TX <-> NR_RX */
for (i = 0; i < nma_get_nrings(na, t); i++) {
NMR(na, t)[i].pipe = NMR(&pna->peer->up, r) + i;
NMR(&pna->peer->up, r)[i].pipe = NMR(na, t) + i;
}
}
}
/* common functions for the nm_register() callbacks of both kind of
* monitors.
*/
static int
netmap_monitor_reg_common(struct netmap_adapter *na, int onoff, int zmon)
{
struct netmap_monitor_adapter *mna =
(struct netmap_monitor_adapter *)na;
struct netmap_priv_d *priv = &mna->priv;
struct netmap_adapter *pna = priv->np_na;
struct netmap_kring *kring, *mkring;
int i;
enum txrx t, s;
ND("%p: onoff %d", na, onoff);
if (onoff) {
if (pna == NULL) {
/* parent left netmap mode, fatal */
D("%s: internal error", na->name);
return ENXIO;
}
for_rx_tx(t) {
for (i = 0; i < nma_get_nrings(na, t) + 1; i++) {
mkring = &NMR(na, t)[i];
if (!nm_kring_pending_on(mkring))
continue;
mkring->nr_mode = NKR_NETMAP_ON;
if (t == NR_TX)
continue;
for_rx_tx(s) {
if (i > nma_get_nrings(pna, s))
continue;
if (mna->flags & nm_txrx2flag(s)) {
kring = &NMR(pna, s)[i];
netmap_monitor_add(mkring, kring, zmon);
}
}
}
}
na->na_flags |= NAF_NETMAP_ON;
} else {
if (na->active_fds == 0)
/* This is called when the monitored adapter leaves netmap mode
* (see netmap_do_unregif).
* We need to notify the monitors that the monitored rings are gone.
* We do this by setting their mna->priv.np_na to NULL.
* Note that the rings are already stopped when this happens, so
* no monitor ring callback can be active.
*/
void
netmap_monitor_stop(struct netmap_adapter *na)
{
enum txrx t;
for_rx_tx(t) {
u_int i;
for (i = 0; i < nma_get_nrings(na, t) + 1; i++) {
struct netmap_kring *kring = &NMR(na, t)[i];
struct netmap_kring *zkring;
u_int j;
for (j = 0; j < kring->n_monitors; j++) {
struct netmap_kring *mkring =
kring->monitors[j];
struct netmap_monitor_adapter *mna =
(struct netmap_monitor_adapter *)mkring->na;
/* forget about this adapter */
if (mna->priv.np_na != NULL) {
netmap_adapter_put(mna->priv.np_na);
mna->priv.np_na = NULL;
}
}
zkring = kring->zmon_list[kring->tx].next;
if (zkring != NULL) {
struct netmap_monitor_adapter *next =
(struct netmap_monitor_adapter *)zkring->na;
struct netmap_monitor_adapter *this =
(struct netmap_monitor_adapter *)na;
struct netmap_adapter *pna = this->priv.np_na;
/* let the next monitor forget about us */
if (next->priv.np_na != NULL) {
netmap_adapter_put(next->priv.np_na);
}
if (pna != NULL && nm_is_zmon(na)) {
/* we are a monitor ourselves and we may
* need to pass down the reference to
* the previous adapter in the chain
*/
netmap_adapter_get(pna);
next->priv.np_na = pna;
continue;
}
next->priv.np_na = NULL;
}
}
}
}
/* This is called when the monitored adapter leaves netmap mode
* (see netmap_do_unregif).
* We need to notify the monitors that the monitored rings are gone.
* We do this by setting their mna->priv.np_na to NULL.
* Note that the rings are already stopped when this happens, so
* no monitor ring callback can be active.
*/
void
netmap_monitor_stop(struct netmap_adapter *na)
{
enum txrx t;
for_rx_tx(t) {
u_int i;
for (i = 0; i < nma_get_nrings(na, t); i++) {
struct netmap_kring *kring = &NMR(na, t)[i];
u_int j;
for (j = 0; j < kring->n_monitors; j++) {
struct netmap_kring *mkring =
kring->monitors[j];
struct netmap_monitor_adapter *mna =
(struct netmap_monitor_adapter *)mkring->na;
/* forget about this adapter */
mna->priv.np_na = NULL;
}
}
}
}
