doc: add vdev ethdev ops restriction in secondary process

Signed-off-by: Marvin Liu <yong.liu@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>

diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst
index 29ca96c..a2c7d3d 100644 (file)
--- a/doc/guides/rel_notes/known_issues.rst
+++ b/doc/guides/rel_notes/known_issues.rst
@@ -787,3 +787,21 @@ PHY link up fails when rebinding i40e NICs to kernel driver
 
 **Driver/Module**:
    Poll Mode Driver (PMD).
+
+
+Restricted vdev ethdev operations supported in secondary process
+----------------------------------------------------------------
+**Description**
+   In current virtual device sharing model, Ethernet device data structure will be
+   shared between primary and secondary process. Only those Ethernet device operations
+   which based on it are workable in secondary process.
+
+**Implication**
+   Some Ethernet device operations like device start/stop will be failed on virtual
+   device in secondary process.
+
+**Affected Environment/Platform**:
+   ALL.
+
+**Driver/Module**:
+   Virtual Device Poll Mode Driver (PMD).