Send changes to Open vSwitch as patches to email@example.com. One patch per email, please. More details are included below.
If you are using Git, then
git format-patch takes care of most of
the mechanics described below for you.
Before you send patches at all, make sure that each patch makes sense. In particular:
A given patch should not break anything, even if later
patches fix the problems that it causes. The source tree
should still build and work after each patch is applied.
git bisect to work best.)
A patch should make one logical change. Don't make multiple, logically unconnected changes to disparate subsystems in a single patch.
A patch that adds or removes user-visible features should also update the appropriate user documentation or manpages. Check "Feature Deprecation Guidelines" section in this document if you intend to remove user-visible feature.
Testing is also important:
A patch that modifies existing code should be tested with
make check before submission.
A patch that adds or deletes files should also be tested with
make distcheck before submission.
A patch that modifies Linux kernel code should be at least build-tested on various Linux kernel versions before submission. I suggest versions 2.6.32 and whatever the current latest release version is at the time.
A patch that modifies the ofproto or vswitchd code should be tested in at least simple cases before submission.
A patch that modifies xenserver code should be tested on XenServer before submission.
If you are using GitHub, then you may utilize the travis-ci.org CI build system by linking your GitHub repository to it. This will run some of the above tests automatically when you push changes to your repository. See the "Continuous Integration with Travis-CI" in the [INSTALL.md] file for details on how to set it up.
The subject line of your email should be in the following format:
[PATCH <n>/<m>] <area>: <summary>
[PATCH <n>/<m>] indicates that this is the nth of a series
of m patches. It helps reviewers to read patches in the
correct order. You may omit this prefix if you are sending
only one patch.
<area>: indicates the area of the Open vSwitch to which the
change applies (often the name of a source file or a
directory). You may omit it if the change crosses multiple
distinct pieces of code.
<summary> briefly describes the change.
The subject, minus the
[PATCH <n>/<m>] prefix, becomes the first line
of the commit's change log message.
The body of the email should start with a more thorough description of the change. This becomes the body of the commit message, following the subject. There is no need to duplicate the summary given in the subject.
Please limit lines in the description to 79 characters in width.
The description should include:
The rationale for the change.
Design description and rationale (but this might be better added as code comments).
Testing that you performed (or testing that should be done but you could not for whatever reason).
Tags (see below).
There is no need to describe what the patch actually changed, if the reader can see it for himself.
If the patch refers to a commit already in the Open vSwitch repository, please include both the commit number and the subject of the patch, e.g. 'commit 632d136c (vswitch: Remove restriction on datapath names.)'.
If you, the person sending the patch, did not write the patch
yourself, then the very first line of the body should take the form
From: <author name> <author email>, followed by a blank line. This
will automatically cause the named author to be credited with
authorship in the repository.
The description ends with a series of tags, written one to a line as the last paragraph of the email. Each tag indicates some property of the patch in an easily machine-parseable manner.
Examples of common tags follow.
Signed-off-by: Author Name <firstname.lastname@example.org...> Informally, this indicates that Author Name is the author or submitter of a patch and has the authority to submit it under the terms of the license. The formal meaning is to agree to the Developer's Certificate of Origin (see below). If the author and submitter are different, each must sign off. If the patch has more than one author, all must sign off. Signed-off-by: Author Name <email@example.com...> Signed-off-by: Submitter Name <firstname.lastname@example.org...> Co-authored-by: Author Name <email@example.com...> Git can only record a single person as the author of a given patch. In the rare event that a patch has multiple authors, one must be given the credit in Git and the others must be credited via Co-authored-by: tags. (All co-authors must also sign off.) Acked-by: Reviewer Name <firstname.lastname@example.org...> Reviewers will often give an Acked-by: tag to code of which they approve. It is polite for the submitter to add the tag before posting the next version of the patch or applying the patch to the repository. Quality reviewing is hard work, so this gives a small amount of credit to the reviewer. Not all reviewers give Acked-by: tags when they provide positive reviews. It's customary only to add tags from reviewers who actually provide them explicitly. Tested-by: Tester Name <email@example.com...> When someone tests a patch, it is customary to add a Tested-by: tag indicating that. It's rare for a tester to actually provide the tag; usually the patch submitter makes the tag himself in response to an email indicating successful testing results. Tested-at: <URL> When a test report is publicly available, this provides a way to reference it. Typical <URL>s would be build logs from autobuilders or references to mailing list archives. Some autobuilders only retain their logs for a limited amount of time. It is less useful to cite these because they may be dead links for a developer reading the commit message months or years later. Reported-by: Reporter Name <firstname.lastname@example.org...> When a patch fixes a bug reported by some person, please credit the reporter in the commit log in this fashion. Please also add the reporter's name and email address to the list of people who provided helpful bug reports in the AUTHORS file at the top of the source tree. Fairly often, the reporter of a bug also tests the fix. Occasionally one sees a combined "Reported-and-tested-by:" tag used to indicate this. It is also acceptable, and more common, to include both tags separately. (If a bug report is received privately, it might not always be appropriate to publicly credit the reporter. If in doubt, please ask the reporter.) Requested-by: Requester Name <email@example.com...> Suggested-by: Suggester Name <firstname.lastname@example.org...> When a patch implements a request or a suggestion made by some person, please credit that person in the commit log in this fashion. For a helpful suggestion, please also add the person's name and email address to the list of people who provided suggestions in the AUTHORS file at the top of the source tree. (If a suggestion or a request is received privately, it might not always be appropriate to publicly give credit. If in doubt, please ask.) Reported-at: <URL> If a patch fixes or is otherwise related to a bug reported in a public bug tracker, please include a reference to the bug in the form of a URL to the specific bug, e.g.: Reported-at: https://bugs.debian.org/743635 This is also an appropriate way to refer to bug report emails in public email archives, e.g.: Reported-at: http://openvswitch.org/pipermail/dev/2014-June/040952.html VMware-BZ: #1234567 ONF-JIRA: EXT-12345 If a patch fixes or is otherwise related to a bug reported in a private bug tracker, you may include some tracking ID for the bug for your own reference. Please include some identifier to make the origin clear, e.g. "VMware-BZ" refers to VMware's internal Bugzilla instance and "ONF-JIRA" refers to the Open Networking Foundation's JIRA bug tracker. Bug #1234567. Issue: 1234567 These are obsolete forms of VMware-BZ: that can still be seen in old change log entries. (They are obsolete because they do not tell the reader what bug tracker is referred to.)
To help track the author of a patch as well as the submission chain, and be clear that the developer has authority to submit a patch for inclusion in openvswitch please sign off your work. The sign off certifies the following:
Developer's Certificate of Origin 1.1 By making a contribution to this project, I certify that: (a) The contribution was created in whole or in part by me and I have the right to submit it under the open source license indicated in the file; or (b) The contribution is based upon previous work that, to the best of my knowledge, is covered under an appropriate open source license and I have the right under that license to submit that work with modifications, whether created in whole or in part by me, under the same open source license (unless I am permitted to submit under a different license), as indicated in the file; or (c) The contribution was provided directly to me by some other person who certified (a), (b) or (c) and I have not modified it. (d) I understand and agree that this project and the contribution are public and that a record of the contribution (including all personal information I submit with it, including my sign-off) is maintained indefinitely and may be redistributed consistent with this project or the open source license(s) involved.
Open vSwitch is intended to be user friendly. This means that under normal circumstances we don't abruptly remove features from OVS that some users might still be using. Otherwise, if we would, then we would possibly break our user setup when they upgrade and would receive bug reports.
Typical process to deprecate a feature in Open vSwitch is to:
(a) Mention deprecation of a feature in the NEWS file. Also, mention expected release or absolute time when this feature would be removed from OVS altogether. Don't use relative time (e.g. "in 6 months") because that is not clearly interpretable. (b) If Open vSwitch is configured to use deprecated feature it should print a warning message to the log files clearly indicating that feature is deprecated and that use of it should be avoided. (c) If this feature is mentioned in man pages, then add "Deprecated" keyword to it.
Also, if there is alternative feature to the one that is about to be marked as deprecated, then mention it in (a), (b) and (c) as well.
Remember to followup and actually remove the feature from OVS codebase once deprecation grace period has expired and users had opportunity to use at least one OVS release that would have informed them about feature deprecation!
If you want to include any comments in your email that should not be
part of the commit's change log message, put them after the
description, separated by a line that contains just
---. It may be
helpful to include a diffstat here for changes that touch multiple
The patch should be in the body of the email following the description, separated by a blank line.
Patches should be in
diff -up format. We recommend that you use Git
to produce your patches, in which case you should use the
git diff (or other Git tools) if your patch renames or
copies files. Quilt (http://savannah.nongnu.org/projects/quilt) might
be useful if you do not want to use Git.
Patches should be inline in the email message. Some email clients corrupt white space or wrap lines in patches. There are hints on how to configure many email clients to avoid this problem at: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob_plain;f=Documentation/email-clients.txt If you cannot convince your email client not to mangle patches, then sending the patch as an attachment is a second choice.
Please follow the style used in the code that you are modifying. The [CodingStyle.md] file describes the coding style used in most of Open vSwitch. Use Linux kernel coding style for Linux kernel code.
``` From fa29a1c2c17682879e79a21bb0cdd5bbe67fa7c0 Mon Sep 17 00:00:00 2001 From: Jesse Gross email@example.com Date: Thu, 8 Dec 2011 13:17:24 -0800 Subject: [PATCH] datapath: Alphabetize include/net/ipv6.h compat header.
datapath/linux/Modules.mk | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/datapath/linux/Modules.mk b/datapath/linux/Modules.mk index fdd952e..f6cb88e 100644 --- a/datapath/linux/Modules.mk +++ b/datapath/linux/Modules.mk @@ -56,11 +56,11 @@ openvswitchheaders += \ linux/compat/include/net/dst.h \ linux/compat/include/net/genetlink.h \ linux/compat/include/net/ip.h \ + linux/compat/include/net/ipv6.h \ linux/compat/include/net/netnamespace.h \ linux/compat/include/net/netlink.h \ linux/compat/include/net/protocol.h \ linux/compat/include/net/route.h \ - linux/compat/include/net/ipv6.h \ linux/compat/genetlink.inc