[virtio-comment] [PATCH v6 0/2] virtio-vsock: introduce SOCK_SEQPACKET description

[virtio-comment] [PATCH v6 0/2] virtio-vsock: introduce SOCK_SEQPACKET description

[Arseny Krasnov]

This adds description of SOCK_SEQPACKET type for virtio-vsock.

Here is latest RFC implementation for Linux, with more details:

https://lkml.org/lkml/2021/5/20/2386

Also this patchset has patch which replaces enums to defines in
virtio-vsock part of spec. SOCK_SEQPACKET patch is based on it.

 Arseny Krasnov(2):
  virtio-vsock: use C style defines for constants
  virtio-vsock: SOCK_SEQPACKET description

 virtio-vsock.tex | 74 ++++++++++++++++++++++++++++------------------
 1 file changed, 46 insertions(+), 28 deletions(-)

-- 
2.25.1


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[virtio-comment] [PATCH v6 1/2] virtio-vsock: use C style defines for constants

[Arseny Krasnov]

This:
1) Replaces enums with C style "defines", because
   use of enums is not documented, while "defines"
   are widely used in spec.
2) Adds defines for some constants.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
---
 virtio-vsock.tex | 54 +++++++++++++++++++++++++-----------------------
 1 file changed, 28 insertions(+), 26 deletions(-)

diff --git a/virtio-vsock.tex b/virtio-vsock.tex
index da7e641..ad57f9d 100644
--- a/virtio-vsock.tex
+++ b/virtio-vsock.tex
@@ -86,23 +86,18 @@ \subsection{Device Operation}\label{sec:Device Types / Socket Device / Device Op
 operation constants:
 
 \begin{lstlisting}
-enum {
-	VIRTIO_VSOCK_OP_INVALID = 0,
-
-	/* Connect operations */
-	VIRTIO_VSOCK_OP_REQUEST = 1,
-	VIRTIO_VSOCK_OP_RESPONSE = 2,
-	VIRTIO_VSOCK_OP_RST = 3,
-	VIRTIO_VSOCK_OP_SHUTDOWN = 4,
-
-	/* To send payload */
-	VIRTIO_VSOCK_OP_RW = 5,
-
-	/* Tell the peer our credit info */
-	VIRTIO_VSOCK_OP_CREDIT_UPDATE = 6,
-	/* Request the peer to send the credit info to us */
-	VIRTIO_VSOCK_OP_CREDIT_REQUEST = 7,
-};
+#define VIRTIO_VSOCK_OP_INVALID        0
+/* Connect operations */
+#define VIRTIO_VSOCK_OP_REQUEST        1
+#define VIRTIO_VSOCK_OP_RESPONSE       2
+#define VIRTIO_VSOCK_OP_RST            3
+#define VIRTIO_VSOCK_OP_SHUTDOWN       4
+/* To send payload */
+#define VIRTIO_VSOCK_OP_RW             5
+/* Tell the peer our credit info */
+#define VIRTIO_VSOCK_OP_CREDIT_UPDATE  6
+/* Request the peer to send the credit info to us */
+#define VIRTIO_VSOCK_OP_CREDIT_REQUEST 7
 \end{lstlisting}
 
 \subsubsection{Virtqueue Flow Control}\label{sec:Device Types / Socket Device / Device Operation / Virtqueue Flow Control}
@@ -140,8 +135,12 @@ \subsubsection{Addressing}\label{sec:Device Types / Socket Device / Device Opera
 consists of a (cid, port number) tuple. The header fields used for this are
 \field{src_cid}, \field{src_port}, \field{dst_cid}, and \field{dst_port}.
 
-Currently only stream sockets are supported. \field{type} is 1 for stream
-socket types.
+Currently only stream sockets are supported. \field{type} is 1 (VIRTIO_VSOCK_TYPE_STREAM)
+for stream socket types.
+
+\begin{lstlisting}
+#define VIRTIO_VSOCK_TYPE_STREAM 1
+\end{lstlisting}
 
 Stream sockets provide in-order, guaranteed, connection-oriented delivery
 without message boundaries.
@@ -222,10 +221,15 @@ \subsubsection{Stream Sockets}\label{sec:Device Types / Socket Device / Device O
 insufficient resources to establish the connection.
 
 When a connected socket receives VIRTIO_VSOCK_OP_SHUTDOWN the header
-\field{flags} field bit 0 indicates that the peer will not receive any more
-data and bit 1 indicates that the peer will not send any more data.  These
-hints are permanent once sent and successive packets with bits clear do not
-reset them.
+\field{flags} field bit VIRTIO_VSOCK_SHUTDOWN_F_RECEIVE (bit 0) set indicates
+that the peer will not receive any more data and bit VIRTIO_VSOCK_SHUTDOWN_F_SEND
+(bit 1) set indicates that the peer will not send any more data.  These hints are
+permanent once sent and successive packets with bits clear do not reset them.
+
+\begin{lstlisting}
+#define VIRTIO_VSOCK_SHUTDOWN_F_RECEIVE 0
+#define VIRTIO_VSOCK_SHUTDOWN_F_SEND    1
+\end{lstlisting}
 
 The VIRTIO_VSOCK_OP_RST packet aborts the connection process or forcibly
 disconnects a connected socket.
@@ -248,9 +252,7 @@ \subsubsection{Device Events}\label{sec:Device Types / Socket Device / Device Op
 The event buffer is as follows:
 
 \begin{lstlisting}
-enum virtio_vsock_event_id {
-        VIRTIO_VSOCK_EVENT_TRANSPORT_RESET = 0,
-};
+#define VIRTIO_VSOCK_EVENT_TRANSPORT_RESET 0
 
 struct virtio_vsock_event {
         le32 id;
-- 
2.25.1


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Re: [PATCH v6 1/2] virtio-vsock: use C style defines for constants

[Stefano Garzarella]

On Mon, May 24, 2021 at 09:33:50PM +0300, Arseny Krasnov wrote:
>This:
>1) Replaces enums with C style "defines", because
>   use of enums is not documented, while "defines"
>   are widely used in spec.
>2) Adds defines for some constants.
>
>Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
>Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
>---
> virtio-vsock.tex | 54 +++++++++++++++++++++++++-----------------------
> 1 file changed, 28 insertions(+), 26 deletions(-)

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>

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[virtio-comment] Re: [PATCH v6 1/2] virtio-vsock: use C style defines for constants

[Stefano Garzarella]

On Mon, May 24, 2021 at 09:33:50PM +0300, Arseny Krasnov wrote:
>This:
>1) Replaces enums with C style "defines", because
>   use of enums is not documented, while "defines"
>   are widely used in spec.
>2) Adds defines for some constants.
>
>Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
>Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
>---
> virtio-vsock.tex | 54 +++++++++++++++++++++++++-----------------------
> 1 file changed, 28 insertions(+), 26 deletions(-)

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>


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[virtio-comment] [PATCH v6 2/2] virtio-vsock: SOCK_SEQPACKET description

[Arseny Krasnov]

This adds description of SOCK_SEQPACKET socket type
support for virtio-vsock.

Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
---
 virtio-vsock.tex | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/virtio-vsock.tex b/virtio-vsock.tex
index ad57f9d..9ef2b0e 100644
--- a/virtio-vsock.tex
+++ b/virtio-vsock.tex
@@ -16,7 +16,10 @@ \subsection{Virtqueues}\label{sec:Device Types / Socket Device / Virtqueues}
 
 \subsection{Feature bits}\label{sec:Device Types / Socket Device / Feature bits}
 
-There are currently no feature bits defined for this device.
+\begin{description}
+\item VIRTIO_VSOCK_F_SEQPACKET (1) SOCK_SEQPACKET socket type is
+    supported.
+\end{description}
 
 \subsection{Device configuration layout}\label{sec:Device Types / Socket Device / Device configuration layout}
 
@@ -135,15 +138,17 @@ \subsubsection{Addressing}\label{sec:Device Types / Socket Device / Device Opera
 consists of a (cid, port number) tuple. The header fields used for this are
 \field{src_cid}, \field{src_port}, \field{dst_cid}, and \field{dst_port}.
 
-Currently only stream sockets are supported. \field{type} is 1 (VIRTIO_VSOCK_TYPE_STREAM)
-for stream socket types.
+Currently stream and seqpacket sockets are supported. \field{type} is 1 (VIRTIO_VSOCK_TYPE_STREAM)
+for stream socket types, and 2 (VIRTIO_VSOCK_TYPE_SEQPACKET) for seqpacket socket types.
 
 \begin{lstlisting}
-#define VIRTIO_VSOCK_TYPE_STREAM 1
+#define VIRTIO_VSOCK_TYPE_STREAM    1
+#define VIRTIO_VSOCK_TYPE_SEQPACKET 2
 \end{lstlisting}
 
 Stream sockets provide in-order, guaranteed, connection-oriented delivery
-without message boundaries.
+without message boundaries. Seqpacket sockets provide in-order, guaranteed,
+connection-oriented delivery with message boundaries.
 
 \subsubsection{Buffer Space Management}\label{sec:Device Types / Socket Device / Device Operation / Buffer Space Management}
 \field{buf_alloc} and \field{fwd_cnt} are used for buffer space management of
@@ -244,6 +249,17 @@ \subsubsection{Stream Sockets}\label{sec:Device Types / Socket Device / Device O
 destination) address tuple for a new connection while the other peer is still
 processing the old connection.
 
+\subsubsection{Seqpacket Sockets}\label{sec:Device Types / Socket Device / Device Operation / Seqpacket Sockets}
+
+\paragraph{Message boundaries}\label{sec:Device Types / Socket Device / Device Operation / Seqpacket Sockets / Message boundaries}
+
+To provide message boundaries, last RW packet of each message has VIRTIO_VSOCK_SEQ_EOR
+bit (bit 0) set in the \field{flags} of packet's header.
+
+\begin{lstlisting}
+#define VIRTIO_VSOCK_SEQ_EOR 1
+\end{lstlisting}
+
 \subsubsection{Device Events}\label{sec:Device Types / Socket Device / Device Operation / Device Events}
 
 Certain events are communicated by the device to the driver using the event
-- 
2.25.1


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Re: [PATCH v6 2/2] virtio-vsock: SOCK_SEQPACKET description

[Stefano Garzarella]

On Mon, May 24, 2021 at 09:34:15PM +0300, Arseny Krasnov wrote:
>This adds description of SOCK_SEQPACKET socket type
>support for virtio-vsock.
>
>Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
>---
> virtio-vsock.tex | 26 +++++++++++++++++++++-----
> 1 file changed, 21 insertions(+), 5 deletions(-)
>
>diff --git a/virtio-vsock.tex b/virtio-vsock.tex
>index ad57f9d..9ef2b0e 100644
>--- a/virtio-vsock.tex
>+++ b/virtio-vsock.tex
>@@ -16,7 +16,10 @@ \subsection{Virtqueues}\label{sec:Device Types / Socket Device / Virtqueues}
>
> \subsection{Feature bits}\label{sec:Device Types / Socket Device / Feature bits}
>
>-There are currently no feature bits defined for this device.
>+\begin{description}
>+\item VIRTIO_VSOCK_F_SEQPACKET (1) SOCK_SEQPACKET socket type is
>+    supported.
>+\end{description}

The VIRTIO_VSOCK_F_STREAM is described in the datagram series by Jiang,
so this patch should be fine:

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>

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[virtio-comment] Re: [PATCH v6 2/2] virtio-vsock: SOCK_SEQPACKET description

[Stefano Garzarella]

On Mon, May 24, 2021 at 09:34:15PM +0300, Arseny Krasnov wrote:
>This adds description of SOCK_SEQPACKET socket type
>support for virtio-vsock.
>
>Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
>---
> virtio-vsock.tex | 26 +++++++++++++++++++++-----
> 1 file changed, 21 insertions(+), 5 deletions(-)
>
>diff --git a/virtio-vsock.tex b/virtio-vsock.tex
>index ad57f9d..9ef2b0e 100644
>--- a/virtio-vsock.tex
>+++ b/virtio-vsock.tex
>@@ -16,7 +16,10 @@ \subsection{Virtqueues}\label{sec:Device Types / Socket Device / Virtqueues}
>
> \subsection{Feature bits}\label{sec:Device Types / Socket Device / Feature bits}
>
>-There are currently no feature bits defined for this device.
>+\begin{description}
>+\item VIRTIO_VSOCK_F_SEQPACKET (1) SOCK_SEQPACKET socket type is
>+    supported.
>+\end{description}

The VIRTIO_VSOCK_F_STREAM is described in the datagram series by Jiang,
so this patch should be fine:

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>


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Re: [virtio-comment] [PATCH v6 0/2] virtio-vsock: introduce SOCK_SEQPACKET description

[Stefano Garzarella]

On Mon, May 24, 2021 at 09:32:29PM +0300, Arseny Krasnov wrote:
>This adds description of SOCK_SEQPACKET type for virtio-vsock.
>
>Here is latest RFC implementation for Linux, with more details:
>
>https://lkml.org/lkml/2021/5/20/2386
>
>Also this patchset has patch which replaces enums to defines in
>virtio-vsock part of spec. SOCK_SEQPACKET patch is based on it.
>
> Arseny Krasnov(2):
>  virtio-vsock: use C style defines for constants
>  virtio-vsock: SOCK_SEQPACKET description
>
> virtio-vsock.tex | 74 ++++++++++++++++++++++++++++------------------
> 1 file changed, 46 insertions(+), 28 deletions(-)
>

The series LGTM!

Let's wait for other comments.

I'll send a follow up patch next week about feature bit for stream 
socket (bit 0).

Thanks,
Stefano

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Re: [virtio-comment] [PATCH v6 0/2] virtio-vsock: introduce SOCK_SEQPACKET description

[Stefano Garzarella]

On Mon, May 24, 2021 at 09:32:29PM +0300, Arseny Krasnov wrote:
>This adds description of SOCK_SEQPACKET type for virtio-vsock.
>
>Here is latest RFC implementation for Linux, with more details:
>
>https://lkml.org/lkml/2021/5/20/2386
>
>Also this patchset has patch which replaces enums to defines in
>virtio-vsock part of spec. SOCK_SEQPACKET patch is based on it.
>
> Arseny Krasnov(2):
>  virtio-vsock: use C style defines for constants
>  virtio-vsock: SOCK_SEQPACKET description
>
> virtio-vsock.tex | 74 ++++++++++++++++++++++++++++------------------
> 1 file changed, 46 insertions(+), 28 deletions(-)
>

The series LGTM!

Let's wait for other comments.

I'll send a follow up patch next week about feature bit for stream 
socket (bit 0).

Thanks,
Stefano


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Re: [virtio-comment] [PATCH v6 0/2] virtio-vsock: introduce SOCK_SEQPACKET description

[Arseny Krasnov]

On 27.05.2021 16:15, Stefano Garzarella wrote:
> On Mon, May 24, 2021 at 09:32:29PM +0300, Arseny Krasnov wrote:
>> This adds description of SOCK_SEQPACKET type for virtio-vsock.
>>
>> Here is latest RFC implementation for Linux, with more details:
>>
>> https://lkml.org/lkml/2021/5/20/2386
>>
>> Also this patchset has patch which replaces enums to defines in
>> virtio-vsock part of spec. SOCK_SEQPACKET patch is based on it.
>>
>> Arseny Krasnov(2):
>>  virtio-vsock: use C style defines for constants
>>  virtio-vsock: SOCK_SEQPACKET description
>>
>> virtio-vsock.tex | 74 ++++++++++++++++++++++++++++------------------
>> 1 file changed, 46 insertions(+), 28 deletions(-)
>>
> The series LGTM!
>
> Let's wait for other comments.

Ping, Linux kernel patches are already merged to net-next


Thank You

>
> I'll send a follow up patch next week about feature bit for stream 
> socket (bit 0).
>
> Thanks,
> Stefano
>
>

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