[PATCH] net: we must ignore unrecognized flags

["Michael S. Tsirkin" <mst@redhat.com>]

We already used that for DATA_VALID, make sure it's easy to
extend even more.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

Looks like this chunk was missing in the patch I sent,
fixing this up.

 content.tex | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/content.tex b/content.tex
index 11015a5..1a15238 100644
--- a/content.tex
+++ b/content.tex
@@ -3345,6 +3345,9 @@ A driver SHOULD NOT send TCP packets requiring segmentation offload which have t
 negotiated\footnote{This is a common restriction in real, older network cards.}, in
 which case it MUST set the VIRTIO_NET_HDR_GSO_ECN bit in \field{gso_type}.
 
+\devicenormative{\paragraph}{Packet Transmission}{Device Types / Network Device / Device Operation / Packet Transmission}
+The device MUST ignore \field{flag} bits that it does not recognize.
+
 \paragraph{Packet Transmission Interrupt}\label{sec:Device Types / Network Device / Device Operation / Packet Transmission / Packet Transmission Interrupt}
 
 Often a driver will suppress transmission interrupts using the
@@ -3451,11 +3454,14 @@ If VIRTIO_NET_F_GUEST_UDP is not negotiated, the device MUST NOT set
 If VIRTIO_NET_F_GUEST_TSO6 is not negotiated, the device MUST NOT set
 \field{gso_type} to VIRTIO_NET_HDR_GSO_TCPV6.
 
 A device SHOULD NOT send TCP packets requiring segmentation offload
 which have the Explicit Congestion Notification bit set, unless the
 VIRTIO_NET_F_GUEST_ECN feature is negotiated, in which case it MUST set
 the VIRTIO_NET_HDR_GSO_ECN bit in \field{gso_type}.
 
+\drivernormative{\paragraph}{Processing of Packets}{Device Types / Network Device / Device Operation / Processing of Packets}
+The driver MUST ignore \field{flag} bits that it does not recognize.
+
 \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Device Operation / Control Virtqueue}
 
 The driver uses the control virtqueue (if VIRTIO_NET_F_CTRL_VQ is
-- 
MST