0fc7daffe5
Use the final official spec name rather than a non-standard abbreviation. Change-Id: I4d797294be35b2fbf7b39570ea3246eb71c8d8ce Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
120 lines
6.1 KiB
Markdown
120 lines
6.1 KiB
Markdown
Changelog
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=========
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v16.08: iSCSI target, NVMe over Fabrics maturity
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------------------------------------------------
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This release adds a userspace iSCSI target. The iSCSI target is capable of exporting
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NVMe devices over a network using the iSCSI protocol. The application is located
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in app/iscsi_tgt and a documented configuration file can be found at etc/spdk/spdk.conf.in.
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This release also significantly improves the existing NVMe over Fabrics target.
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- The configuration file format was changed, which will require updates to
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any existing nvmf.conf files (see `etc/spdk/nvmf.conf.in`):
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- `SubsystemGroup` was renamed to `Subsystem`.
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- `AuthFile` was removed (it was unimplemented).
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- `nvmf_tgt` was updated to correctly recognize NQN (NVMe Qualified Names)
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when naming subsystems. The default node name was changed to reflect this;
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it is now "nqn.2016-06.io.spdk".
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- `Port` and `Host` sections were merged into the `Subsystem` section
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- Global options to control max queue depth, number of queues, max I/O
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size, and max in-capsule data size were added.
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- The Nvme section was removed. Now a list of devices is specified by
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bus/device/function directly in the Subsystem section.
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- Subsystems now have a Mode, which can be Direct or Virtual. This is an attempt
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to future-proof the interface, so the only mode supported by this release
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is "Direct".
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- Many bug fixes and cleanups were applied to the `nvmf_tgt` app and library.
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- The target now supports discovery.
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This release also adds one new feature and provides some better examples and tools
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for the NVMe driver.
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- The Weighted Round Robin arbitration method is now supported. This allows
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the user to specify different priorities on a per-I/O-queue basis. To
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enable WRR, set the `arb_mechanism` field during `spdk_nvme_probe()`.
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- A simplified "Hello World" example was added to show the proper way to use
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the NVMe library API; see `examples/nvme/hello_world/hello_world.c`.
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- A test for measuring software overhead was added. See `test/lib/nvme/overhead`.
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v16.06: NVMf userspace target
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-----------------------------
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This release adds a userspace NVMf (NVMe over Fabrics) target, conforming to the
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newly-released NVMf 1.0/NVMe 1.2.1 specification. The NVMf target exports NVMe
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devices from a host machine over the network via RDMA. Currently, the target is
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limited to directly exporting physical NVMe devices, and the discovery subsystem
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is not supported.
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This release includes a general API cleanup, including renaming all declarations
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in public headers to include a `spdk` prefix to prevent namespace clashes with
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user code.
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- NVMe
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- The `nvme_attach()` API was reworked into a new probe/attach model, which
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moves device detection into the NVMe library. The new API also allows
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parallel initialization of NVMe controllers, providing a major reduction in
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startup time when using multiple controllers.
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- I/O queue allocation was changed to be explicit in the API. Each function
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that generates I/O requests now takes a queue pair (`spdk_nvme_qpair *`)
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argument, and I/O queues may be allocated using
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`spdk_nvme_ctrlr_alloc_io_qpair()`. This allows more flexible assignment of
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queue pairs than the previous model, which only allowed a single queue
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per thread and limited the total number of I/O queues to the lowest number
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supported on any attached controller.
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- Added support for the Write Zeroes command.
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- `examples/nvme/perf` can now report I/O command latency from the
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the controller's viewpoint using the Intel vendor-specific read/write latency
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log page.
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- Added namespace reservation command support, which can be used to coordinate
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sharing of a namespace between multiple hosts.
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- Added hardware SGL support, which enables use of scattered buffers that
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don't conform to the PRP list alignment and length requirements on supported
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NVMe controllers.
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- Added end-to-end data protection support, including the ability to write and
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read metadata in extended LBA (metadata appended to each block of data in the
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buffer) and separate metadata buffer modes.
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See `spdk_nvme_ns_cmd_write_with_md()` and `spdk_nvme_ns_cmd_read_with_md()`
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for details.
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- IOAT
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- The DMA block fill feature is now exposed via the `ioat_submit_fill()`
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function. This is functionally similar to `memset()`, except the memory is
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filled with an 8-byte repeating pattern instead of a single byte like memset.
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- PCI
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- Added support for using DPDK for PCI device mapping in addition to the
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existing libpciaccess option. Using the DPDK PCI support also allows use of
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the Linux VFIO driver model, which means that SPDK userspace drivers will work
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with the IOMMU enabled. Additionally, SPDK applications may be run as an
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unprivileged user with access restricted to a specific set of PCIe devices.
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- The PCI library API was made more generic to abstract away differences
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between the underlying PCI access implementations.
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v1.2.0: IOAT user-space driver
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------------------------------
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This release adds a user-space driver with support for the Intel I/O Acceleration Technology (I/OAT, also known as "Crystal Beach") DMA offload engine.
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- IOAT
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- New user-space driver supporting DMA memory copy offload
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- Example programs `ioat/perf` and `ioat/verify`
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- Kernel-mode DMA engine test driver `kperf` for performance comparison
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- NVMe
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- Per-I/O flags for Force Unit Access (FUA) and Limited Retry
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- Public API for retrieving log pages
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- Reservation register/acquire/release/report command support
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- Scattered payload support - an alternate API to provide I/O buffers via a sequence of callbacks
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- Declarations and `nvme/identify` support for Intel SSD DC P3700 series vendor-specific log pages and features
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- Updated to support DPDK 2.2.0
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v1.0.0: NVMe user-space driver
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------------------------------
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This is the initial open source release of the Storage Performance Development Kit (SPDK).
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Features:
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- NVMe user-space driver
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- NVMe example programs
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- `examples/nvme/perf` tests performance (IOPS) using the NVMe user-space driver
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- `examples/nvme/identify` displays NVMe controller information in a human-readable format
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- Linux and FreeBSD support
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