Skip to content

v18.04: Logical Volume Snapshot/Clone, iSCSI Initiator, Bdev QoS, VPP Userspace TCP/IP

Choose a tag to compare
released this 27 Apr 23:15
· 15632 commits to master since this release


The SPDK vhost-scsi, vhost-blk and vhost-nvme applications have fixes to address the DPDK rte_vhost vulnerability CVE-2018-1059. Please see this security advisory for additional information on the DPDK vulnerability.

Workarounds have been added to ensure vhost compatibility with QEMU 2.12.

EXPERIMENTAL: Support for vhost-nvme has been added to the SPDK vhost target. See the vhost documentation for more details.

Unified Target Application

A new unified SPDK target application, spdk_tgt, has been added. This application combines the functionality of several existing SPDK applications, including the iSCSI target, NVMe-oF target, and vhost target. The new application can be managed through the existing configuration file and [JSON-RPC] ( methods.


spdk_mempool_get_bulk() has been added to wrap DPDK rte_mempool_get_bulk().

New memory management functions spdk_malloc(), spdk_zmalloc(), and spdk_free() have been added. These new functions have a flags parameter that allows the user to specify whether the allocated memory needs to be suitable for DMA and whether it should be shared across processes with the same shm_id. The new functions are intended to replace spdk_dma_malloc() and related functions, which will eventually be deprecated and removed.


A new optional bdev module interface function, init_complete, has been added to notify bdev modules when the bdev subsystem initialization is complete. This may be useful for virtual bdevs that require notification that the set of initialization examine() calls is complete.

The bdev layer now allows modules to provide an optional per-bdev UUID, which can be retrieved with the spdk_bdev_get_uuid() function.

Enforcement of IOPS limits for quality of service (QoS) has been added to the bdev layer. See the set_bdev_qos_limit_iops documentation for more details.


The [Rpc] configuration file section, which was deprecated in v18.01, has been removed. Users should switch to the -r command-line parameter instead.

The JSON-RPC server implementation now allows up to 32 megabyte responses, growing as needed; previously, the response was limited to 32 kilobytes.


EXPERIMENTAL: New SPDKCLI interactive command tool for managing SPDK is available. See the SPDKCLI documentation for more details.

NVMe Driver

EXPERIMENTAL: Support for WDS and RDS capable CMBs in NVMe controllers has been added. This support is experimental pending a functional allocator to free and reallocate CMB buffers.

spdk_nvme_ns_get_uuid() has been added to allow retrieval of per-namespace UUIDs when available.

New API functions spdk_nvme_ctrlr_get_first_active_ns() and spdk_nvme_ctrlr_get_next_active_ns() have been added to iterate active namespaces, as well as spdk_nvme_ctrlr_is_active_ns() to check if a namespace ID is active.

NVMe-oF Target

Namespaces may now be assigned unique identifiers via new optional eui64 and nguid parameters to the nvmf_subsystem_add_ns RPC method. Additionally, the NVMe-oF target automatically exposes the backing bdev's UUID as the namespace UUID when available.

spdk_nvmf_subsystem_remove_ns() is now asynchronous and requires a callback to indicate completion.


A number of functions have been renamed:

  • spdk_bs_io_write_blob() => spdk_blob_io_write()
  • spdk_bs_io_read_blob() => spdk_blob_io_read()
  • spdk_bs_io_writev_blob() => spdk_blob_io_writev()
  • spdk_bs_io_readv_blob() => spdk_blob_io_readv()
  • spdk_bs_io_unmap_blob() => spdk_blob_io_unmap()
  • spdk_bs_io_write_zeroes_blob() => spdk_blob_io_write_zeroes()

The old names still exist but are deprecated. They will be removed in the v18.07 release.

spdk_blob_resize() is now an asynchronous operation to enable resizing a blob while I/O are in progress to that blob on other threads. An explicit spdk_blob_sync_md() is still required to sync the updated metadata to disk.

Logical Volumes

A new destroy_lvol_bdev RPC method to delete logical volumes has been added.

Lvols now have their own UUIDs which replace previous LvolStoreUUID_BlobID combination.

New Snapshot and Clone funtionalities have been added. User may create Snapshots of existing Lvols and Clones of existing Snapshots. See the lvol snapshots documentation for more details.

Resizing logical volumes is now supported via the resize_lvol_bdev RPC method.


A set of changes were made in the SPDK's lib code altering instances of calls to exit() and abort() to return a failure instead wherever reasonably possible.

spdk_app_start() no longer exit()'s on an internal failure, but instead returns a non-zero error status.

spdk_app_parse_args() no longer exit()'s on help, '-h', or an invalid option, but instead returns SPDK_APP_PARSE_ARGS_HELP and SPDK_APP_PARSE_ARGS_FAIL, respectively, and SPDK_APP_PARSE_ARGS_SUCCESS on success.

spdk_pci_get_device() has been deprecated and will be removed in SPDK v18.07.

I/O Channels

The prototype for spdk_poller_fn() has been modified; it now returns a value indicating whether or not the poller did any work. Existing pollers will need to be updated to return a value.

iSCSI Target

The SPDK iSCSI target now supports the Vector Packet Processing (VPP) framework userspace TCP/IP stack. See the iSCSI VPP documentation for more details.

iSCSI initiator

An iSCSI initiator bdev module has been added to SPDK. This module should be considered experimental pending additional features and tests. More details can be found in lib/bdev/iscsi/README.


The persistent memory (PMDK) bdev module is now enabled using --with-pmdk instead of --with-nvml. This reflects the renaming of the persistent memory library from NVML to PMDK.

Virtio Block driver

A userspace driver for Virtio Block devices has been added. It was built on top of the Virtio library and can be managed similarly to the Virtio SCSI driver. See the
Virtio Block reference for more information.

Virtio with 2MB hugepages

The previous 1GB hugepage limitation has now been lifted. A new -g command-line option enables SPDK Virtio to work with 2MB hugepages. See 2MB hugepages for details.