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Subject: [PATCH v4] virtio-network: Clarify VLAN filter table configuration
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] 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: v3->v4: - added description for accepting vlan tagged packets when vlan filter is not negotiated v2->v3: - corrected grammar - simplified description for untagged packets 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 | 22 +++++++++++++++++++ 2 files changed, 23 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..0e6d872 100644 --- a/device-types/virtio-network/device.tex +++ b/device-types/virtio-network/device.tex @@ -1210,6 +1210,28 @@ \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 that matches the device's filter +configuration. + +When VIRTIO_NET_F_CTRL_VLAN is negotiated, the device starts with +an empty VLAN filtering table. + +When VIRTIO_NET_F_CTRL_VLAN is negotiated, the device accepts all +VLAN tagged packets whose VLAN tag is found in the VLAN filtering +table; the device should drop all VLAN tagged packets whose VLAN tag +is not found in the VLAN filtering table. The VLAN filtering table +applies only to the VLAN tagged packets. + \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
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