[PATCH v2] virtio-net: define the VIRTIO_NET_F_CTRL_RX_EXTRA feature bit

[Alvaro Karsz <alvaro.karsz@solid-run.com>]

The VIRTIO_NET_F_CTRL_RX_EXTRA feature bit is mentioned in the spec
since version 1.0, but it's not properly defined.

This patch defines the feature bit and defines the dependency on VIRTIO_NET_F_CTRL_VQ.

Since this dependency is missing in previous versions, we add it now as
a "SHOULD".

Fixes: https://github.com/oasis-tcs/virtio-spec/issues/162

Signed-off-by: Alvaro Karsz <alvaro.karsz@solid-run.com>
---
v2:
	- Rephrase commit log, no changes to patch body.

 device-types/net/description.tex | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/device-types/net/description.tex b/device-types/net/description.tex
index 8487ccd..cf37da5 100644
--- a/device-types/net/description.tex
+++ b/device-types/net/description.tex
@@ -74,6 +74,8 @@ \subsection{Feature bits}\label{sec:Device Types / Network Device / Feature bits
 
 \item[VIRTIO_NET_F_CTRL_VLAN (19)] Control channel VLAN filtering.
 
+\item[VIRTIO_NET_F_CTRL_RX_EXTRA (20)]	Control channel RX extra mode support.
+
 \item[VIRTIO_NET_F_GUEST_ANNOUNCE(21)] Driver can send gratuitous
     packets.
 
@@ -259,6 +261,9 @@ \subsection{Device configuration layout}\label{sec:Device Types / Network Device
 The device SHOULD NOT offer VIRTIO_NET_F_HASH_REPORT if it
 does not offer VIRTIO_NET_F_CTRL_VQ.
 
+The device SHOULD NOT offer VIRTIO_NET_F_CTRL_RX_EXTRA if it
+does not offer VIRTIO_NET_F_CTRL_VQ.
+
 \drivernormative{\subsubsection}{Device configuration layout}{Device Types / Network Device / Device configuration layout}
 
 A driver SHOULD negotiate VIRTIO_NET_F_MAC if the device offers it.
@@ -295,6 +300,9 @@ \subsection{Device configuration layout}\label{sec:Device Types / Network Device
 A driver SHOULD NOT negotiate VIRTIO_NET_F_HASH_REPORT if it
 does not negotiate VIRTIO_NET_F_CTRL_VQ.
 
+A driver SHOULD NOT negotiate VIRTIO_NET_F_CTRL_RX_EXTRA if it
+does not negotiate VIRTIO_NET_F_CTRL_VQ.
+
 \subsubsection{Legacy Interface: Device configuration layout}\label{sec:Device Types / Network Device / Device configuration layout / Legacy Interface: Device configuration layout}
 \label{sec:Device Types / Block Device / Feature bits / Device configuration layout / Legacy Interface: Device configuration layout}
 When using the legacy interface, transitional devices and drivers
-- 
2.34.1