Function vduse_iotlb_miss

dpdk/lib/vhost/vduse.c:68–121

}

static int
vduse_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm __rte_unused)
{
	struct vduse_iotlb_entry entry;
	uint64_t size, page_size;
	struct stat stat;
	void *mmap_addr;
	int fd, ret;

	entry.start = iova;
	entry.last = iova + 1;

	ret = ioctl(dev->vduse_dev_fd, VDUSE_IOTLB_GET_FD, &entry);
	if (ret < 0) {
		VHOST_LOG_CONFIG(dev->ifname, ERR, "Failed to get IOTLB entry for 0x%" PRIx64 "\n",
				iova);
		return -1;
	}

	fd = ret;

	VHOST_LOG_CONFIG(dev->ifname, DEBUG, "New IOTLB entry:\n");
	VHOST_LOG_CONFIG(dev->ifname, DEBUG, "\tIOVA: %" PRIx64 " - %" PRIx64 "\n",
			(uint64_t)entry.start, (uint64_t)entry.last);
	VHOST_LOG_CONFIG(dev->ifname, DEBUG, "\toffset: %" PRIx64 "\n", (uint64_t)entry.offset);
	VHOST_LOG_CONFIG(dev->ifname, DEBUG, "\tfd: %d\n", fd);
	VHOST_LOG_CONFIG(dev->ifname, DEBUG, "\tperm: %x\n", entry.perm);

	size = entry.last - entry.start + 1;
	mmap_addr = mmap(0, size + entry.offset, entry.perm, MAP_SHARED, fd, 0);
	if (!mmap_addr) {
		VHOST_LOG_CONFIG(dev->ifname, ERR,
				"Failed to mmap IOTLB entry for 0x%" PRIx64 "\n", iova);
		ret = -1;
		goto close_fd;
	}

	ret = fstat(fd, &stat);
	if (ret < 0) {
		VHOST_LOG_CONFIG(dev->ifname, ERR, "Failed to get page size.\n");
		munmap(mmap_addr, entry.offset + size);
		goto close_fd;
	}
	page_size = (uint64_t)stat.st_blksize;

	vhost_user_iotlb_cache_insert(dev, entry.start, (uint64_t)(uintptr_t)mmap_addr,
		entry.offset, size, page_size, entry.perm);

	ret = 0;
close_fd:
	close(fd);

	return ret;
}

static struct vhost_backend_ops vduse_backend_ops = {
	.iotlb_miss = vduse_iotlb_miss,