Re: [virtio-comment] RE: [PATCH] virtio-net: Fix virtio_net_hdr struct size when VIRTIO_NET_F_HASH_REPORT is negotiated.

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

On Wed, May 03, 2023 at 01:39:59PM +0000, Cyril Germond wrote:
> Hello
> It seems this proposal has not received feedback from virtio-net folks.
> What should we do with it ?
> Thanks

Request a vote to resolve this as described at:
https://github.com/oasis-tcs/virtio-spec#use-of-github-issues

> -----Original Message-----
> From: Cyril Germond <cgermond@kalray.eu> 
> Sent: Monday, November 21, 2022 10:03 AM
> To: virtio-comment@lists.oasis-open.org
> Cc: Cyril Germond <cgermond@kalray.eu>
> Subject: [PATCH] virtio-net: Fix virtio_net_hdr struct size when VIRTIO_NET_F_HASH_REPORT is negotiated.
> 
> Hard-coded references to the size of virtio_net_hdr strut are wrong when VIRTIO_NET_HASH_REPORT feature is negotiated.
> 
> Changelog:
> v1->v2: Fixed wording syntax
> v2->v3: Rebase
> 
> Signed-off-by: Cyril Germond <cgermond@kalray.eu>
> ---
>  content.tex    | 10 ++++++----
>  split-ring.tex |  3 ++-
>  2 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/content.tex b/content.tex
> index 91ba76c..61bc09c 100644
> --- a/content.tex
> +++ b/content.tex
> @@ -3622,8 +3622,8 @@ \subsubsection{Setting Up Receive Buffers}\label{sec:Device Types / Network Devi  features are used, the maximum incoming packet  will be to 65550 bytes long (the maximum size of a  TCP or UDP packet, plus the 14 byte ethernet header), otherwise
> -1514 bytes.  The 12-byte struct virtio_net_hdr is prepended to this, -making for 65562 or 1526 bytes.
> +1514 bytes.  The struct virtio_net_hdr (the length of which depends on 
> +VIRTIO_NET_F_HASH_REPORT feature negotiation) is prepended to this.
>  
>  \drivernormative{\paragraph}{Setting Up Receive Buffers}{Device Types / Network Device / Device Operation / Setting Up Receive Buffers}
>  
> @@ -3632,9 +3632,11 @@ \subsubsection{Setting Up Receive Buffers}\label{sec:Device Types / Network Devi
>    \begin{itemize}
>      \item If VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, VIRTIO_NET_F_GUEST_UFO,
>  	VIRTIO_NET_F_GUEST_USO4 or VIRTIO_NET_F_GUEST_USO6 are negotiated, the driver SHOULD populate
> -      the receive queue(s) with buffers of at least 65562 bytes.
> +      the receive queue(s) with buffers of at least 65570 bytes
> +      if VIRTIO_NET_F_HASH_REPORT is negotiated, 65562 bytes otherwise.
>      \item Otherwise, the driver SHOULD populate the receive queue(s)
> -      with buffers of at least 1526 bytes.
> +      with buffers of at least 1534 bytes if VIRTIO_NET_F_HASH_REPORT
> +      is negotiated, 1526 bytes otherwise.
>    \end{itemize}
>  \item If VIRTIO_NET_F_MRG_RXBUF is negotiated, each buffer MUST be at  least the size of the struct virtio_net_hdr.
> diff --git a/split-ring.tex b/split-ring.tex index de94038..82e910f 100644
> --- a/split-ring.tex
> +++ b/split-ring.tex
> @@ -127,7 +127,8 @@ \subsection{Legacy Interfaces: A Note on Virtqueue Endianness}\label{sec:Basic F
>  
>  \subsection{Message Framing}\label{sec:Basic Facilities of a Virtio Device / Virtqueues / Message Framing}  The framing of messages with descriptors is -independent of the contents of the buffers. For example, a network
> +independent of the contents of the buffers. For example, if 
> +VIRTIO_NET_F_HASH_REPORT has not been negotiated, a network
>  transmit buffer consists of a 12 byte header followed by the network  packet. This could be most simply placed in the descriptor table as a
>  12 byte output descriptor followed by a 1514 byte output descriptor,
> --
> 2.25.1
> 
> 
> 
> 
> 
> 
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