Merge branch 'upstream' into 18.08.x

Change-Id: Ifbda2d554199dd4d11e01f0090881b5f0103ae12
Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/doc/guides/nics/thunderx.rst b/doc/guides/nics/thunderx.rst
index 26423747..e84eaafe 100644
--- a/doc/guides/nics/thunderx.rst
+++ b/doc/guides/nics/thunderx.rst
@@ -30,6 +30,7 @@ Features of the ThunderX PMD are:
 - SR-IOV VF
 - NUMA support
 - Multi queue set support (up to 96 queues (12 queue sets)) per port
+- Skip data bytes
 
 Supported ThunderX SoCs
 -----------------------
@@ -312,6 +313,21 @@ We will choose four secondary queue sets from the ending of the list (0002:01:01
 
 The nicvf thunderx driver will make use of attached secondary VFs automatically during the interface configuration stage.
 
+
+Module params
+--------------
+
+skip_data_bytes
+~~~~~~~~~~~~~~~
+This feature is used to create a hole between HEADROOM and actual data. Size of hole is specified
+in bytes as module param("skip_data_bytes") to pmd.
+This scheme is useful when application would like to insert vlan header without disturbing HEADROOM.
+
+Example:
+   .. code-block:: console
+
+      -w 0002:01:00.2,skip_data_bytes=8
+
 Limitations
 -----------
 
@@ -335,3 +351,8 @@ Maximum packet segments
 The ThunderX SoC family NICs support up to 12 segments per packet when working
 in scatter/gather mode. So, setting MTU will result with ``EINVAL`` when the
 frame size does not fit in the maximum number of segments.
+
+skip_data_bytes
+~~~~~~~~~~~~~~~
+
+Maximum limit of skip_data_bytes is 128 bytes and number of bytes should be multiple of 8.