docs/install-instr: Add target specific cfg sect.

Fuel 8.0 adds support for setting up "Offloading Modes" for
target nodes.

Document how this features should be used (and why/when it's
necessary), and also its common limitation of not being applied
during Verify Networks step (see related Fuel bug report [1]).

While at it, fix minor reference to branch in git tag checkout
instructions, as we'd be in detached HEAD and not on a new branch.

[1] https://jira.opnfv.org/browse/FUEL-134

[Alexandru.Avadanii@enea.com]
Only minor edits and prepared for upstreaming, this is mostly
based on previous work from Florin.

Change-Id: If7a8ca44541903dbeb6db36bc64fe56b132165cb
Signed-off-by: Florin Dumitrascu <florin.dumitrascu@enea.com>
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

3 files changed, 50 insertions, 1 deletions

diff --git a/docs/img/fuelconsole1.png b/docs/img/fuelconsole1.png
new file mode 100644
index 000000000..61703cab1
--- /dev/null
+++ b/docs/img/fuelconsole1.png
diff --git a/docs/img/offloadingmodes.png b/docs/img/offloadingmodes.png
new file mode 100644
index 000000000..5b3cb17bc
--- /dev/null
+++ b/docs/img/offloadingmodes.png
diff --git a/docs/installation-instruction.rst b/docs/installation-instruction.rst
index 05f8bd0cb..d1036dd9e 100644
--- a/docs/installation-instruction.rst
+++ b/docs/installation-instruction.rst
@@ -53,7 +53,7 @@ opnfv/fuel git repository.  To retrieve the repository for the Brahmaputra relea
 
 $ git clone https://gerrit.opnfv.org/gerrit/fuel
 
-Check-out the Brahmaputra release tag to set the branch to the
+Check-out the Brahmaputra release tag to set the HEAD to the
 baseline required to replicate the Brahmaputra release:
 
 $ git checkout brahmaputra.1.0
@@ -534,6 +534,55 @@ that can be used for installation / deployment of openstack.
 
    - Click <Save Settings> at the bottom to Save your changes
 
+Target specific configuration
+-----------------------------
+
+#. Set up targets for provisioning with non-default "Offloading Modes"
+
+   Some target nodes may require additional configuration after they are
+   PXE booted (bootstrapped); the most frequent changes are in defaults
+   for ethernet devices' "Offloading Modes" settings (e.g. some targets'
+   ethernet drivers may strip VLAN traffic by default).
+
+   If your target ethernet drivers have wrong "Offloading Modes" defaults,
+   in "Configure interfaces" page (described above), expand affected
+   interface's "Offloading Modes" and [un]check the relevant settings
+   (see figure below):
+
+   .. figure:: img/offloadingmodes.png
+
+#. Set up targets for "Verify Networks" with non-default "Offloading Modes"
+
+   **NOTE**: Check *Reference 15* for an updated and comprehensive list of
+   known issues and/or limitations, including "Offloading Modes" not being
+   applied during "Verify Networks" step.
+
+   Setting custom "Offloading Modes" in Fuel GUI will only apply those settings
+   during provisiong and **not** during "Verify Networks", so if your targets
+   need this change, you have to apply "Offloading Modes" settings by hand
+   to bootstrapped nodes.
+
+   **E.g.**: Our driver has "rx-vlan-filter" default "on" (expected "off") on
+   the Openstack interface(s) "eth1", preventing VLAN traffic from passing
+   during "Verify Networks".
+
+   - From Fuel master console identify target nodes admin IPs (see figure below):
+
+     .. code-block:: bash
+
+         $ fuel nodes
+
+     .. figure:: img/fuelconsole1.png
+
+   - SSH into each of the target nodes and disable "rx-vlan-filter" on the
+     affected physical interface(s) allocated for OpenStack traffic (eth1):
+
+     .. code-block:: bash
+
+         $ ssh root@10.20.0.6 ethtool -K eth1 rx-vlan-filter off
+
+   - Repeat the step above for all affected nodes/interfaces in the POD.
+
 Verify Networks
 ---------------