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Subject: [virtio-comment] content: Declare virtio-net legacy feature bits 41-42
These bits are in use by current Windows production driver for virtio-net. If virtio-net device uses one of them the driver will not function. Reserving these bits for virtio-net device until current production driver reaches EOL. Fixes: https://github.com/oasis-tcs/virtio-spec/issues/21 Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com> --- content.tex | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/content.tex b/content.tex index be18234..6484491 100644 --- a/content.tex +++ b/content.tex @@ -2552,13 +2552,13 @@ Some networking feature bits require other networking feature bits \subsubsection{Legacy Interface: Feature bits}\label{sec:Device Types / Network Device / Feature bits / Legacy Interface: Feature bits} \begin{description} -\item[VIRTIO_NET_F_GSO (6)] Device handles packets with any GSO type. +\item[VIRTIO_NET_F_GSO (6)] Device handles packets with any GSO type. This was supposed to indicate segmentation offload support, but +upon further investigation it became clear that multiple bits were needed. +\item[VIRTIO_NET_F_GUEST_RSC4 (41)] Device coalesces TCPIP v4 packets. This was implemented by hypervisor patch for certification +purposes and current Windows driver depends on it. It will not function if virtio-net device reports this feature. +\item[VIRTIO_NET_F_GUEST_RSC6 (42)] Device coalesces TCPIP v6 packets. Similar to VIRTIO_NET_F_GUEST_RSC4. \end{description} -This was supposed to indicate segmentation offload support, but -upon further investigation it became clear that multiple bits -were needed. - \subsection{Device configuration layout}\label{sec:Device Types / Network Device / Device configuration layout} \label{sec:Device Types / Block Device / Feature bits / Device configuration layout} -- 2.17.0
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