virtio-comment

The filtering behavior of the VLAN filter commands is not very clear as
discussed in thread [1].

Hence, add the command description and device requirements for it.

[1] qemu-devel@nongnu.org/msg912392.html">https://www.mail-archive.com/qemu-devel@nongnu.org/msg912392.html
Fixes: https://github.com/oasis-tcs/virtio-spec/issues/147
Suggested-by: Si-Wei Liu <si-wei.liu@oracle.com>
Signed-off-by: Parav Pandit <parav@nvidia.com>
---
changelog:
v1->v2:
- adapt to new file path
v0->v1:
- added missing conformance section link
---
.../virtio-network/device-conformance.tex | 1 +
device-types/virtio-network/device.tex | 23 +++++++++++++++++++
2 files changed, 24 insertions(+)

diff --git a/device-types/virtio-network/device-conformance.tex b/device-types/virtio-network/device-conformance.tex
index c686377..54f6783 100644
--- a/device-types/virtio-network/device-conformance.tex
+++ b/device-types/virtio-network/device-conformance.tex
@@ -9,6 +9,7 @@
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Processing of Incoming Packets}
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / Packet Receive Filtering}
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / Setting MAC Address Filtering}
+\item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / VLAN Filtering}
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / Gratuitous Packet Sending}
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / Automatic receive steering in multiqueue mode}
\item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / Receive-side scaling (RSS) / RSS processing}
diff --git a/device-types/virtio-network/device.tex b/device-types/virtio-network/device.tex
index e7cdd6f..1b8fde9 100644
--- a/device-types/virtio-network/device.tex
+++ b/device-types/virtio-network/device.tex
@@ -1210,6 +1210,29 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi
Both the VIRTIO_NET_CTRL_VLAN_ADD and VIRTIO_NET_CTRL_VLAN_DEL
command take a little-endian 16-bit VLAN id as the command-specific-data.

+VIRTIO_NET_CTRL_VLAN_ADD command adds the specified VLAN to the VLAN
+filtering table.
+
+VIRTIO_NET_CTRL_VLAN_DEL command removes specified VLAN from the VLAN
+filtering table which was previously added using
+VIRTIO_NET_CTRL_VLAN_ADD command.
+
+\devicenormative{\subparagraph}{VLAN Filtering}{Device Types / Network Device / Device Operation / Control Virtqueue / VLAN Filtering}
+
+When VIRTIO_NET_F_CTRL_VLAN is not negotiated, the device accepts all
+VLAN tagged packets which matches device's filter configuration.
+
+When VIRTIO_NET_F_CTRL_VLAN is negotiated, the device starts with empty
+VLAN filtering table.
+
+When VIRTIO_NET_F_CTRL_VLAN is negotiated, the device accepts all the
+VLAN tagged packets whose VLAN tag is found in the VLAN filtering table;
+device should drop all VLAN tagged packets whose VLAN tag is not found
+in the VLAN filtering table.
+
+When VIRTIO_NET_F_CTRL_VLAN is negotiated, the device accepts all
+untagged packets which matches device's filter configuration.
+
\subparagraph{Legacy Interface: VLAN Filtering}\label{sec:Device Types / Network Device / Device Operation / Control Virtqueue / VLAN Filtering / Legacy Interface: VLAN Filtering}
When using the legacy interface, transitional devices and drivers
MUST format the VLAN id
--
2.26.2