Function mlx5_common_dev_dma_unmap

dpdk/drivers/common/mlx5/mlx5_common.c:1161–1201

* Callback to DMA unmap external memory to a device. * * @param rte_dev * Pointer to the generic device. * @param addr * Starting virtual address of memory to be unmapped. * @param iova * Starting IOVA address of memory to be unmapped. * @param len * Length of memory segment being unmapped. * * @return * 0 on success, negative value on error. */

 *   0 on success, negative value on error.
 */
int
mlx5_common_dev_dma_unmap(struct rte_device *rte_dev, void *addr,
			  uint64_t iova __rte_unused, size_t len __rte_unused)
{
	struct mlx5_common_device *dev;
	struct mr_cache_entry entry;
	struct mlx5_mr *mr;

	dev = to_mlx5_device(rte_dev);
	if (!dev) {
		DRV_LOG(WARNING,
			"Unable to find matching mlx5 device to device %s.",
			rte_dev->name);
		rte_errno = ENODEV;
		return -1;
	}
	rte_rwlock_read_lock(&dev->mr_scache.rwlock);
	mr = mlx5_mr_lookup_list(&dev->mr_scache, &entry, (uintptr_t)addr);
	if (!mr) {
		rte_rwlock_read_unlock(&dev->mr_scache.rwlock);
		DRV_LOG(WARNING,
			"Address 0x%" PRIxPTR " wasn't registered to device %s",
			(uintptr_t)addr, rte_dev->name);
		rte_errno = EINVAL;
		return -1;
	}
	LIST_REMOVE(mr, mr);
	DRV_LOG(DEBUG, "MR(%p) is removed from list.", (void *)mr);
	mlx5_mr_free(mr, dev->mr_scache.dereg_mr_cb);
	mlx5_mr_rebuild_cache(&dev->mr_scache);
	/*
	 * No explicit wmb is needed after updating dev_gen due to
	 * store-release ordering in unlock that provides the
	 * implicit barrier at the software visible level.
	 */
	++dev->mr_scache.dev_gen;
	DRV_LOG(DEBUG, "Broadcasting local cache flush, gen=%d.",
		dev->mr_scache.dev_gen);
	rte_rwlock_read_unlock(&dev->mr_scache.rwlock);
	return 0;
}

void
mlx5_class_driver_register(struct mlx5_class_driver *driver)