/*
* add a netmap port. We add them in pairs, so forwarding occurs
* between two of them.
*/
void
netmap_add_port(const char *dev)
{
static struct sess *s1 = NULL; // XXX stateful; bad!
struct my_netmap_port *port;
int l;
struct sess *s2;
D("opening netmap device %s", dev);
l = strlen(dev) + 1;
if (l >= IFNAMSIZ) {
D("name %s too long, max %d", dev, IFNAMSIZ - 1);
sleep(2);
return;
}
port = calloc(1, sizeof(*port));
port->d = nm_open(dev, NULL, 0, NULL);
if (port->d == NULL) {
D("error opening %s", dev);
kern_free(port); // XXX compat
return;
}
strncpy(port->ifp.if_xname, dev, IFNAMSIZ-1);
port->allocator_id = port->d->req.nr_arg2;
D("--- mem_id %d", port->allocator_id);
s2 = new_session(port->d->fd, netmap_read, port, WANT_READ);
port->sess = s2;
D("create sess %p my_netmap_port %p", s2, port);
if (s1 == NULL) { /* first of a pair */
s1 = s2;
} else { /* second of a pair, cross link */
struct my_netmap_port *peer = s1->arg;
port->peer = peer;
peer->peer = port;
port->can_swap_bufs = peer->can_swap_bufs =
(port->allocator_id == peer->allocator_id);
D("%p %s %d <-> %p %s %d %s",
port, port->d->req.nr_name, port->allocator_id,
peer, peer->d->req.nr_name, peer->allocator_id,
port->can_swap_bufs ? "SWAP" : "COPY");
s1 = NULL;
}
}
/*
* Destroy a DMA mapping from crosstalk space to system address space.
* There is no actual mapping hardware to destroy, but we at least mark
* the dmamap INVALID and free the space that it took.
*/
void
hub_dmamap_free(hub_dmamap_t hub_dmamap)
{
hub_dmamap->hdma_flags &= ~HUB_DMAMAP_IS_VALID;
kern_free(hub_dmamap);
}
