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Differential D22390 Diff 64585 head/sys/net/netmap_user.h

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head/sys/net/netmap_user.h

Show First 20 Lines • Show All 975 Lines • ▼ Show 20 Linesnm_close(struct nm_desc *d)
free(d); free(d);
return 0; return 0;
} }
static int static int
nm_mmap(struct nm_desc *d, const struct nm_desc *parent) nm_mmap(struct nm_desc *d, const struct nm_desc *parent)
{ {
//XXX TODO: check if mmap is already done if (d->done_mmap)
return 0;
vmaffioneUnsubmitted
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I would just return here. If done_mmap == 1, it means that somebody already went through the initializations a the end of this function.

vmaffione: I would just return here. If done_mmap == 1, it means that somebody already went through the…
if (IS_NETMAP_DESC(parent) && parent->mem && if (IS_NETMAP_DESC(parent) && parent->mem &&
parent->req.nr_arg2 == d->req.nr_arg2) { parent->req.nr_arg2 == d->req.nr_arg2) {
/* do not mmap, inherit from parent */ /* do not mmap, inherit from parent */
D("do not mmap, inherit from parent"); D("do not mmap, inherit from parent");
d->memsize = parent->memsize; d->memsize = parent->memsize;
d->mem = parent->mem; d->mem = parent->mem;
} else { } else {
/* XXX TODO: check if memsize is too large (or there is overflow) */ /* XXX TODO: check if memsize is too large (or there is overflow) */
d->memsize = d->req.nr_memsize; d->memsize = d->req.nr_memsize;
d->mem = mmap(0, d->memsize, PROT_WRITE | PROT_READ, MAP_SHARED, d->mem = mmap(0, d->memsize, PROT_WRITE | PROT_READ, MAP_SHARED,
d->fd, 0); d->fd, 0);
if (d->mem == MAP_FAILED) { if (d->mem == MAP_FAILED) {
goto fail; goto fail;
} }
d->done_mmap = 1; d->done_mmap = 1;
} }
{ {
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This can go away (see above).

vmaffione: This can go away (see above).
struct netmap_if *nifp = NETMAP_IF(d->mem, d->req.nr_offset); struct netmap_if *nifp = NETMAP_IF(d->mem, d->req.nr_offset);
struct netmap_ring *r = NETMAP_RXRING(nifp, d->first_rx_ring); struct netmap_ring *r = NETMAP_RXRING(nifp, d->first_rx_ring);
if ((void *)r == (void *)nifp) { if ((void *)r == (void *)nifp) {
/* the descriptor is open for TX only */ /* the descriptor is open for TX only */
r = NETMAP_TXRING(nifp, d->first_tx_ring); r = NETMAP_TXRING(nifp, d->first_tx_ring);
} }
*(struct netmap_if **)(uintptr_t)&(d->nifp) = nifp; *(struct netmap_if **)(uintptr_t)&(d->nifp) = nifp;
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