doc: announce removal of vhost zero-copy dequeue

Vhost-user dequeue zero-copy support will be removed in
20.11. The only known user is OVS where the feature is
still experimental, and has not received any update for
several years. This feature faces reliability issues and
is often conflicting with new features being implemented.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Chenbo Xia <chenbo.xia@intel.com>
Acked-by: Ian Stokes <ian.stokes@intel.com>
Acked-by: Ciara Loftus <ciara.loftus@intel.com>
Acked-by: Aaron Conole <aconole@redhat.com>

diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index 52489b5..9b4f623 100644 (file)
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -252,6 +252,12 @@ Deprecation Notices
 * pmd_dpaa: The API ``rte_pmd_dpaa_set_tx_loopback`` will have extended
   ``port_id`` definition from ``uint8_t`` to ``uint16_t``.
 
+* vhost: Vhost-user dequeue zero-copy support will be removed in 20.11.
+  The only known user is OVS where the feature is still experimental,
+  and has not received any update for 2.5 years.
+  This feature faces reliability issues and is often conflicting with
+  new features being implemented.
+
 * security: The API ``rte_security_session_create`` takes only single mempool
   for session and session private data. So the application need to create
   mempool for twice the number of sessions needed and will also lead to