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numam-spdk/CHANGELOG.md
Daniel Verkamp 3272320c73 nvme: make I/O queue allocation explicit 
The previous method for registering I/O queues did not allow the user
to specify queue priority for weighted round robin arbitration, and it
limited the application to one queue per controller per thread.

Change the API to require explicit allocation of each queue for each
controller using the new function spdk_nvme_ctrlr_alloc_io_qpair().

Each function that submits a command on an I/O queue now takes an
explicit qpair parameter rather than implicitly using the thread-local
queue.

This also allows the application to allocate different numbers of
threads per controller; previously, the number of queues was capped at
the smallest value supported by any attached controller.

Weighted round robin arbitration is not supported yet; additional
changes to the controller startup process are required to enable
alternate arbitration methods.

Change-Id: Ia33be1050a6953bc5a3cca9284aefcd95b01116e
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
2016-03-14 16:00:54 -07:00

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Changelog

Upcoming release

This release includes a general API cleanup, including renaming all declarations in public headers to include a spdk prefix to prevent namespace clashes with user code.

  • NVMe
    • The nvme_attach() API was reworked into a new probe/attach model, which moves device detection into the NVMe library. The new API also allows parallel initialization of NVMe controllers, providing a major reduction in startup time when using multiple controllers.
    • I/O queue allocation was changed to be explicit in the API. Each function that generates I/O requests now takes a queue pair (spdk_nvme_qpair *) argument, and I/O queues may be allocated using spdk_nvme_ctrlr_alloc_io_qpair(). This allows more flexible assignment of queue pairs than the previous model, which only allowed a single queue per thread and limited the total number of I/O queues to the lowest number supported on any attached controller.
    • Added support for the Write Zeroes command.
    • examples/nvme/perf can now report I/O command latency from the the controller's viewpoint using the Intel vendor-specific read/write latency log page.
    • Added namespace reservation command support, which can be used to coordinate sharing of a namespace between multiple hosts.
    • Added hardware SGL support, which enables use of scattered buffers that don't conform to the PRP list alignment and length requirements on supported NVMe controllers.
  • IOAT
    • The DMA block fill feature is now exposed via the ioat_submit_fill() function. This is functionally similar to memset(), except the memory is filled with an 8-byte repeating pattern instead of a single byte like memset.
  • PCI
    • Added support for using DPDK for PCI device mapping in addition to the existing libpciaccess option.
    • The PCI library API was made more generic to abstract away differences between the underlying PCI access implementations.

v1.2.0: IOAT user-space driver

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.

  • IOAT
    • New user-space driver supporting DMA memory copy offload
    • Example programs ioat/perf and ioat/verify
    • Kernel-mode DMA engine test driver kperf for performance comparison
  • NVMe
    • Per-I/O flags for Force Unit Access (FUA) and Limited Retry
    • Public API for retrieving log pages
    • Reservation register/acquire/release/report command support
    • Scattered payload support - an alternate API to provide I/O buffers via a sequence of callbacks
    • Declarations and nvme/identify support for Intel SSD DC P3700 series vendor-specific log pages and features
  • Updated to support DPDK 2.2.0

v1.0.0: NVMe user-space driver

This is the initial open source release of the Storage Performance Development Kit (SPDK).

Features:

  • NVMe user-space driver
  • NVMe example programs
    • examples/nvme/perf tests performance (IOPS) using the NVMe user-space driver
    • examples/nvme/identify displays NVMe controller information in a human-readable format
  • Linux and FreeBSD support