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Subject: [PATCH] virtio-net: Fix VIRTIO_NET_F_GUEST_HDRLEN feature definition.
Fix driver and device requirements with regards to the VIRTIO_NET_F_GUEST_HDRLEN feature - 'hdr_len' must be accurate only for TSO/UFO packets. Signed-off-by: Vitaly Mireyno <vmireyno@marvell.com> --- content.tex | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/content.tex b/content.tex index b91a132..2f71f8f 100644 --- a/content.tex +++ b/content.tex @@ -3354,10 +3354,12 @@ \subsubsection{Packet Transmission}\label{sec:Device Types / Network Device / De been negotiated: \begin{itemize} \item If the VIRTIO_NET_F_GUEST_HDRLEN feature has been negotiated, + and \field{gso_type} differs from VIRTIO_NET_HDR_GSO_NONE, the driver MUST set \field{hdr_len} to a value equal to the length of the headers, including the transport header. \item If the VIRTIO_NET_F_GUEST_HDRLEN feature has not been negotiated, + or \field{gso_type} is VIRTIO_NET_HDR_GSO_NONE, the driver SHOULD set \field{hdr_len} to a value not less than the length of the headers, including the transport header. @@ -3379,6 +3381,7 @@ \subsubsection{Packet Transmission}\label{sec:Device Types / Network Device / De been negotiated: \begin{itemize} \item If the VIRTIO_NET_F_GUEST_HDRLEN feature has been negotiated, + and \field{gso_type} differs from VIRTIO_NET_HDR_GSO_NONE, the device MAY use \field{hdr_len} as the transport header size. \begin{note} @@ -3387,6 +3390,7 @@ \subsubsection{Packet Transmission}\label{sec:Device Types / Network Device / De \end{note} \item If the VIRTIO_NET_F_GUEST_HDRLEN feature has not been negotiated, + or \field{gso_type} is VIRTIO_NET_HDR_GSO_NONE, the device MAY use \field{hdr_len} only as a hint about the transport header size. The device MUST NOT rely on \field{hdr_len} to be correct. --
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