Add a changelog

Import the release notes from previous releases and fill out the major
features for the next release.

Change-Id: I5050d6cc83a92fac4f1dbed5f7ef039cca208765
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>

CHANGELOG.md

@@ -0,0 +1,63 @@
+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.
+  - 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

README.md

@@ -23,6 +23,8 @@ Documentation
 
 [Porting Guide](PORTING.md)
 
+[Changelog](CHANGELOG.md)
+
 Prerequisites
 =============