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Re: [Qemu-devel] [PATCH] qemu-options: add documentation for using UDP u


From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [PATCH] qemu-options: add documentation for using UDP unicast network backend.
Date: Mon, 19 Oct 2015 13:32:47 +0300

On Mon, Oct 19, 2015 at 12:49:15PM +0300, Victor Kaplansky wrote:
> For a long time QEMU has had support for UDP unicast network
> backend, but manual was missing description and usage examples.
> 
> This patch adds some more documentation and an example.
> 
> Signed-off-by: Victor Kaplansky <address@hidden>


Good point, thanks!
Minor comments:

> ---
>  qemu-options.hx | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 2485b94..342bb14 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -1855,6 +1855,8 @@ qemu-system-i386 linux.img \
>                   -net socket,connect=127.0.0.1:1234
>  @end example
>  
> +
> +
>  @item -netdev 
> socket,address@hidden,address@hidden,address@hidden:@var{port}[,address@hidden
>  @itemx -net 
> socket[,address@hidden,address@hidden,address@hidden,address@hidden:@var{port}[,address@hidden
>  

Why add this here? Probably safe to drop.

> @@ -1907,6 +1909,27 @@ qemu-system-i386 linux.img \
>                   -net socket,mcast=239.192.168.1:1102,localaddr=1.2.3.4
>  @end example
>  
> address@hidden -netdev 
> socket,address@hidden,address@hidden,address@hidden:@var{rport}[,address@hidden:@var{lport}]]
> address@hidden -net 
> socket[,address@hidden,address@hidden,address@hidden,address@hidden:@var{rport}[,address@hidden:@var{lport}]]

-net variant says "host" -netdev - lhost/rhost.

> +
> +Connect a VLAN @var{n} to a remote VLAN in another QEMU virtual
> +machine using a UDP tunnel. Use lport as local port and rport as
> +remote port of the tunnel.

the local port/the remote port

Pls document lhost/rhost as well.
> The two QEMU 

QEMU instances


>can be running on
> +different hosts.

There are no "the two QEMU" so far.
Should this come after the examples?

> Use @option{fd=h} to specify an already opened
> +UDP socket.
> +
> +Example:
> address@hidden
> +# launch one QEMU instance
> +qemu-system-i386 linux.img \
> +                 -device virtio-net-pci,netdev=net0 \
> +                 -netdev 
> socket,id=net0,udp=127.0.0.1:4444,localaddr=127.0.0.1:5555
> +# launch second QEMU instance sharing the network with the first one

"a second QEMU instance"

> +qemu-system-i386 linux.img \
> +                 -device virtio-net-pci,netdev=net0 \
> +                 -netdev 
> socket,id=net0,udp=127.0.0.1:5555,localaddr=127.0.0.1:4444

localhost might be a bit clearer, this way people know names are OK to use, too.
It does work, doesn't it?

> address@hidden example
> +
>  @item -netdev 
> l2tpv3,address@hidden,address@hidden,address@hidden,address@hidden,address@hidden,address@hidden,address@hidden,ipv6][,udp][,cookie64][,counter][,pincounter][,address@hidden,address@hidden,address@hidden
>  @itemx -net 
> l2tpv3[,address@hidden,address@hidden,address@hidden,address@hidden,address@hidden,address@hidden,address@hidden,address@hidden,ipv6][,udp][,cookie64][,counter][,pincounter][,address@hidden,address@hidden,address@hidden
>  Connect VLAN @var{n} to L2TPv3 pseudowire. L2TPv3 (RFC3391) is a popular
> -- 
> --Victor



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