Function inflight_mem_alloc

dpdk/lib/vhost/vhost_user.c:1545–1586

}

static void *
inflight_mem_alloc(struct virtio_net *dev, const char *name, size_t size, int *fd)
{
	void *ptr;
	int mfd = -1;
	uint64_t alignment;
	char fname[20] = "/tmp/memfd-XXXXXX";

	*fd = -1;
#ifdef MEMFD_SUPPORTED
	mfd = memfd_create(name, MFD_CLOEXEC);
#else
	RTE_SET_USED(name);
#endif
	if (mfd == -1) {
		mfd = mkstemp(fname);
		if (mfd == -1) {
			VHOST_LOG_CONFIG(dev->ifname, ERR, "failed to get inflight buffer fd\n");
			return NULL;
		}

		unlink(fname);
	}

	if (ftruncate(mfd, size) == -1) {
		VHOST_LOG_CONFIG(dev->ifname, ERR, "failed to alloc inflight buffer\n");
		close(mfd);
		return NULL;
	}

	ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0);
	if (ptr == MAP_FAILED) {
		VHOST_LOG_CONFIG(dev->ifname, ERR, "failed to mmap inflight buffer\n");
		close(mfd);
		return NULL;
	}

	alignment = get_blk_size(mfd);
	mem_set_dump(ptr, size, false, alignment);
	*fd = mfd;
	return ptr;
}

static uint32_t
get_pervq_shm_size_split(uint16_t queue_size)