Imported Upstream version 17.05

Change-Id: Id1e419c5a214e4a18739663b91f0f9a549f1fdc6
Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>

1 files changed, 99 insertions, 0 deletions

diff --git a/doc/guides/contributing/stable.rst b/doc/guides/contributing/stable.rst
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+.. stable_lts_releases:
+
+DPDK Stable Releases and Long Term Support
+==========================================
+
+This section sets out the guidelines for the DPDK Stable Releases and the DPDK
+Long Term Support releases (LTS).
+
+
+Introduction
+------------
+
+The purpose of the DPDK Stable Releases is to maintain releases of DPDK with
+backported fixes over an extended period of time. This provides downstream
+consumers of DPDK with a stable target on which to base applications or
+packages.
+
+The Long Term Support release (LTS) is a designation applied to a Stable
+Release to indicate longer term support.
+
+
+Stable Releases
+---------------
+
+Any major release of DPDK can be designated as a Stable Release if a
+maintainer volunteers to maintain it.
+
+A Stable Release is used to backport fixes from an ``N`` release back to an
+``N-1`` release, for example, from 16.11 to 16.07.
+
+The duration of a stable is one complete release cycle (3 months). It can be
+longer, up to 1 year, if a maintainer continues to support the stable branch,
+or if users supply backported fixes, however the explicit commitment should be
+for one release cycle.
+
+The release cadence is determined by the maintainer based on the number of
+bugfixes and the criticality of the bugs. Releases should be coordinated with
+the validation engineers to ensure that a tagged release has been tested.
+
+
+LTS Release
+-----------
+
+A stable release can be designated as an LTS release based on community
+agreement and a commitment from a maintainer. An LTS release will have a
+maintenance duration of 2 years.
+
+The current DPDK LTS release is 16.11.
+
+It is anticipated that there will be at least 4 releases per year of the LTS
+or approximately 1 every 3 months. However, the cadence can be shorter or
+longer depending on the number and criticality of the backported
+fixes. Releases should be coordinated with the validation engineers to ensure
+that a tagged release has been tested.
+
+
+What changes should be backported
+---------------------------------
+
+Backporting should be limited to bug fixes.
+
+Features should not be backported to stable releases. It may be acceptable, in
+limited cases, to back port features for the LTS release where:
+
+* There is a justifiable use case (for example a new PMD).
+* The change is non-invasive.
+* The work of preparing the backport is done by the proposer.
+* There is support within the community.
+
+
+The Stable Mailing List
+-----------------------
+
+The Stable and LTS release are coordinated on the stable@dpdk.org mailing
+list.
+
+All fix patches to the master branch that are candidates for backporting
+should also be CCed to the `stable@dpdk.org <http://dpdk.org/ml/listinfo/stable>`_
+mailing list.
+
+
+Releasing
+---------
+
+A Stable Release will be released by:
+
+* Tagging the release with YY.MM.n (year, month, number).
+* Uploading a tarball of the release to dpdk.org.
+* Sending an announcement to the `announce@dpdk.org <http://dpdk.org/ml/listinfo/announce>`_
+  list.
+
+Stable releases are available on the `dpdk.org download page <http://dpdk.org/download>`_.
+
+
+ABI
+---
+
+The Stable Release should not be seen as a way of breaking or circumventing
+the DPDK ABI policy.